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Diffstat (limited to 'src/mesh/gnunet-service-mesh-new.c')
| -rw-r--r-- | src/mesh/gnunet-service-mesh-new.c | 8483 |
1 files changed, 8483 insertions, 0 deletions
diff --git a/src/mesh/gnunet-service-mesh-new.c b/src/mesh/gnunet-service-mesh-new.c new file mode 100644 index 0000000..82bfc5e --- /dev/null +++ b/src/mesh/gnunet-service-mesh-new.c @@ -0,0 +1,8483 @@ +/* + This file is part of GNUnet. + (C) 2001-2012 Christian Grothoff (and other contributing authors) + + GNUnet is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3, or (at your + option) any later version. + + GNUnet is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with GNUnet; see the file COPYING. If not, write to the + Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. +*/ + +/** + * @file mesh/gnunet-service-mesh.c + * @brief GNUnet MESH service + * @author Bartlomiej Polot + * + * STRUCTURE: + * - DATA STRUCTURES + * - GLOBAL VARIABLES + * - GENERAL HELPERS + * - PERIODIC FUNCTIONS + * - MESH NETWORK HANDLER HELPERS + * - MESH NETWORK HANDLES + * - MESH LOCAL HANDLER HELPERS + * - MESH LOCAL HANDLES + * - MAIN FUNCTIONS (main & run) + * + * TODO: + * - error reporting (CREATE/CHANGE/ADD/DEL?) -- new message! + * - partial disconnect reporting -- same as error reporting? + * - add ping message + * - relay corking down to core + * - set ttl relative to tree depth + * - Add data ACK count in path ACK + * - Make common GNUNET_MESH_Data header for unicast, to_orig, multicast + * TODO END + */ + +#include "platform.h" +#include "mesh.h" +#include "mesh_protocol.h" +#include "mesh_tunnel_tree.h" +#include "block_mesh.h" +#include "gnunet_dht_service.h" +#include "gnunet_statistics_service.h" +#include "gnunet_regex_lib.h" + +#define MESH_BLOOM_SIZE 128 + +#define MESH_DEBUG_DHT GNUNET_NO +#define MESH_DEBUG_CONNECTION GNUNET_NO +#define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO + +#define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\ + GNUNET_TIME_UNIT_MINUTES,\ + 10) + +#if MESH_DEBUG_CONNECTION +#define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__) +#else +#define DEBUG_CONN(...) +#endif + +#if MESH_DEBUG_DHT +#define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__) +#else +#define DEBUG_DHT(...) +#endif + +#if MESH_DEBUG_TIMING +#include <time.h> +double __sum; +uint64_t __count; +struct timespec __mesh_start; +struct timespec __mesh_end; +#define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start)) +#define INTERVAL_END \ +do {\ + clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\ + double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\ + if (__diff < 0) __diff += 1000000000;\ + __sum += __diff;\ + __count++;\ +} while (0) +#define INTERVAL_SHOW \ +if (0 < __count)\ + GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count) +#else +#define INTERVAL_START +#define INTERVAL_END +#define INTERVAL_SHOW +#endif + +/******************************************************************************/ +/************************ DATA STRUCTURES ****************************/ +/******************************************************************************/ + +/** FWD declaration */ +struct MeshPeerInfo; +struct MeshClient; + + +/** + * Struct representing a piece of data being sent to other peers + */ +struct MeshData +{ + /** Tunnel it belongs to. */ + struct MeshTunnel *t; + + /** How many remaining neighbors still hav't got it. */ + unsigned int reference_counter; + + /** How many remaining neighbors we need to send this to. */ + unsigned int total_out; + + /** Size of the data. */ + size_t data_len; + + /** Data itself */ + void *data; +}; + + +/** + * Struct containing info about a queued transmission to this peer + */ +struct MeshPeerQueue +{ + /** + * DLL next + */ + struct MeshPeerQueue *next; + + /** + * DLL previous + */ + struct MeshPeerQueue *prev; + + /** + * Peer this transmission is directed to. + */ + struct MeshPeerInfo *peer; + + /** + * Tunnel this message belongs to. + */ + struct MeshTunnel *tunnel; + + /** + * Pointer to info stucture used as cls. + */ + void *cls; + + /** + * Type of message + */ + uint16_t type; + + /** + * Size of the message + */ + size_t size; +}; + + +/** + * Struct to store regex information announced by clients. + */ +struct MeshRegexDescriptor +{ + /** + * Regular expression itself. + */ + char *regex; + + /** + * How many characters per edge can we squeeze? + */ + uint16_t compression; + + /** + * Handle to announce the regex. + */ + struct GNUNET_REGEX_announce_handle *h; +}; + + +/** + * Struct to keep information of searches of services described by a regex + * using a user-provided string service description. + */ +struct MeshRegexSearchInfo +{ + /** + * Which tunnel is this for + */ + struct MeshTunnel *t; + + /** + * User provided description of the searched service. + */ + char *description; + + /** + * Regex search handle. + */ + struct GNUNET_REGEX_search_handle *search_handle; + + /** + * Peer that is connecting via connect_by_string. When connected, free ctx. + */ + GNUNET_PEER_Id peer; + + /** + * Other peers that are found but not yet being connected to. + */ + GNUNET_PEER_Id *peers; + + /** + * Number of elements in peers. + */ + unsigned int n_peers; + + /** + * Next peer to try to connect to. + */ + unsigned int i_peer; + + /** + * Timeout for a connect attempt. + * When reached, try to connect to a different peer, if any. If not, + * try the same peer again. + */ + GNUNET_SCHEDULER_TaskIdentifier timeout; + +}; + + +/** + * Struct containing all info possibly needed to build a package when called + * back by core. + */ +struct MeshTransmissionDescriptor +{ + /** ID of the tunnel this packet travels in */ + struct MESH_TunnelID *origin; + + /** Who was this message being sent to */ + struct MeshPeerInfo *peer; + + /** Ultimate destination of the packet */ + GNUNET_PEER_Id destination; + + /** Data descriptor */ + struct MeshData* mesh_data; +}; + + +/** + * Struct containing all information regarding a given peer + */ +struct MeshPeerInfo +{ + /** + * ID of the peer + */ + GNUNET_PEER_Id id; + + /** + * Last time we heard from this peer + */ + struct GNUNET_TIME_Absolute last_contact; + + /** + * Task handler for delayed connect task; + */ + GNUNET_SCHEDULER_TaskIdentifier connect_task; + + /** + * Number of attempts to reconnect so far + */ + int n_reconnect_attempts; + + /** + * Paths to reach the peer, ordered by ascending hop count + */ + struct MeshPeerPath *path_head; + + /** + * Paths to reach the peer, ordered by ascending hop count + */ + struct MeshPeerPath *path_tail; + + /** + * Handle to stop the DHT search for a path to this peer + */ + struct GNUNET_DHT_GetHandle *dhtget; + + /** + * Closure given to the DHT GET + */ + struct MeshPathInfo *dhtgetcls; + + /** + * Array of tunnels this peer participates in + * (most probably a small amount, therefore not a hashmap) + * When the path to the peer changes, notify these tunnels to let them + * re-adjust their path trees. + */ + struct MeshTunnel **tunnels; + + /** + * Number of tunnels this peers participates in + */ + unsigned int ntunnels; + + /** + * Transmission queue to core DLL head + */ + struct MeshPeerQueue *queue_head; + + /** + * Transmission queue to core DLL tail + */ + struct MeshPeerQueue *queue_tail; + + /** + * How many messages are in the queue to this peer. + */ + unsigned int queue_n; + + /** + * Handle to for queued transmissions + */ + struct GNUNET_CORE_TransmitHandle *core_transmit; +}; + + +/** + * Globally unique tunnel identification (owner + number) + * DO NOT USE OVER THE NETWORK + */ +struct MESH_TunnelID +{ + /** + * Node that owns the tunnel + */ + GNUNET_PEER_Id oid; + + /** + * Tunnel number to differentiate all the tunnels owned by the node oid + * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI ) + */ + MESH_TunnelNumber tid; +}; + + +/** + * Struct containing all information regarding a tunnel + * For an intermediate node the improtant info used will be: + * - id Tunnel unique identification + * - paths[0] To know where to send it next + * - metainfo: ready, speeds, accounting + */ +struct MeshTunnel +{ + /** + * Tunnel ID + */ + struct MESH_TunnelID id; + + /** + * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 ) + */ + MESH_TunnelNumber local_tid; + + /** + * Local tunnel number for local destination clients (incoming number) + * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same + * number. + */ + MESH_TunnelNumber local_tid_dest; + + /** + * Is the speed on the tunnel limited to the slowest peer? + */ + int speed_min; + + /** + * Is the tunnel bufferless (minimum latency)? + */ + int nobuffer; + + /** + * Packet ID of the last fwd packet seen (sent/retransmitted/received). + */ + uint32_t fwd_pid; + + /** + * Packet ID of the last bck packet sent (unique counter per hop). + */ + uint32_t bck_pid; + + /** + * SKIP value for this tunnel. + */ + uint32_t skip; + + /** + * Force sending ACK? Flag to allow duplicate ACK on POLL. + */ + int force_ack; + + /** + * MeshTunnelChildInfo of all children, indexed by GNUNET_PEER_Id. + * Contains the Flow Control info: FWD ACK value received, + * last BCK ACK sent, PID and SKIP values. + */ + struct GNUNET_CONTAINER_MultiHashMap *children_fc; + + /** + * Last ACK sent towards the origin (for traffic towards leaf node). + */ + uint32_t last_fwd_ack; + + /** + * BCK ACK value received from the hop towards the owner of the tunnel, + * (previous node / owner): up to what message PID can we sent back to him. + */ + uint32_t bck_ack; + + /** + * How many messages are in the forward queue (towards leaves). + */ + unsigned int fwd_queue_n; + + /** + * How many messages do we accept in the forward queue. + */ + unsigned int fwd_queue_max; + + /** + * How many messages are in the backward queue (towards origin). + */ + unsigned int bck_queue_n; + + /** + * How many messages do we accept in the backward queue. + */ + unsigned int bck_queue_max; + + /** + * Task to poll peer in case of a stall. + */ + GNUNET_SCHEDULER_TaskIdentifier fc_poll_bck; + + /** + * Last time the tunnel was used + */ + struct GNUNET_TIME_Absolute timestamp; + + /** + * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo) + * containing peers added by id or by type, not intermediate peers. + */ + struct GNUNET_CONTAINER_MultiHashMap *peers; + + /** + * Number of peers that are connected and potentially ready to receive data + */ + unsigned int peers_ready; + + /** + * Number of peers that have been added to the tunnel + */ + unsigned int peers_total; + + /** + * Client owner of the tunnel, if any + */ + struct MeshClient *owner; + + /** + * Clients that have been informed about and want to stay in the tunnel. + */ + struct MeshClient **clients; + + /** + * Flow control info for each client. + */ + struct MeshTunnelClientInfo *clients_fc; + + /** + * Number of elements in clients/clients_fc + */ + unsigned int nclients; + + /** + * Clients that have been informed but requested to leave the tunnel. + */ + struct MeshClient **ignore; + + /** + * Number of elements in clients + */ + unsigned int nignore; + + /** + * Blacklisted peers + */ + GNUNET_PEER_Id *blacklisted; + + /** + * Number of elements in blacklisted + */ + unsigned int nblacklisted; + + /** + * Bloomfilter (for peer identities) to stop circular routes + */ + char bloomfilter[MESH_BLOOM_SIZE]; + + /** + * Tunnel paths + */ + struct MeshTunnelTree *tree; + + /** + * Application type we are looking for in this tunnel + */ + GNUNET_MESH_ApplicationType type; + + /** + * Used to search peers offering a service + */ + struct GNUNET_DHT_GetHandle *dht_get_type; + + /** + * Handle for the regex search for a connect_by_string + */ + struct MeshRegexSearchInfo *regex_search; + + /** + * Task to keep the used paths alive + */ + GNUNET_SCHEDULER_TaskIdentifier path_refresh_task; + + /** + * Task to destroy the tunnel after timeout + * + * FIXME: merge the two? a tunnel will have either + * a path refresh OR a timeout, never both! + */ + GNUNET_SCHEDULER_TaskIdentifier timeout_task; + + /** + * Flag to signal the destruction of the tunnel. + * If this is set GNUNET_YES the tunnel will be destroyed + * when the queue is empty. + */ + int destroy; + + /** + * Total messages pending for this tunnels, payload or not. + */ + unsigned int pending_messages; + + /** + * If the tunnel is empty, destoy it. + */ + GNUNET_SCHEDULER_TaskIdentifier delayed_destroy; +}; + + +/** + * Info about a child node in a tunnel, needed to perform flow control. + */ +struct MeshTunnelChildInfo +{ + /** + * ID of the child node. + */ + GNUNET_PEER_Id id; + + /** + * SKIP value. + */ + uint32_t skip; + + /** + * Last sent PID. + */ + uint32_t fwd_pid; + + /** + * Last received PID. + */ + uint32_t bck_pid; + + /** + * Maximum PID allowed (FWD ACK received). + */ + uint32_t fwd_ack; + + /** + * Last ACK sent to that child (BCK ACK). + */ + uint32_t bck_ack; + + /** + * Circular buffer pointing to MeshPeerQueue elements for all + * payload traffic going to this child. + * Size determined by the tunnel queue size (@c t->fwd_queue_max). + */ + struct MeshPeerQueue **send_buffer; + + /** + * Index of the oldest element in the send_buffer. + */ + unsigned int send_buffer_start; + + /** + * How many elements are already in the buffer. + */ + unsigned int send_buffer_n; + + /** + * Tunnel this info is about + */ + struct MeshTunnel *t; + + /** + * Task to poll peer in case of a stall. + */ + GNUNET_SCHEDULER_TaskIdentifier fc_poll; + + /** + * Time to use for next polling call. + */ + struct GNUNET_TIME_Relative fc_poll_time; +}; + + +/** + * Info about a leaf client of a tunnel, needed to perform flow control. + */ +struct MeshTunnelClientInfo +{ + /** + * PID of the last packet sent to the client (FWD). + */ + uint32_t fwd_pid; + + /** + * PID of the last packet received from the client (BCK). + */ + uint32_t bck_pid; + + /** + * Maximum PID allowed (FWD ACK received). + */ + uint32_t fwd_ack; + + /** + * Last ACK sent to that child (BCK ACK). + */ + uint32_t bck_ack; +}; + + + +/** + * Info collected during iteration of child nodes in order to get the ACK value + * for a tunnel. + */ +struct MeshTunnelChildIteratorContext +{ + /** + * Tunnel whose info is being collected. + */ + struct MeshTunnel *t; + + /** + * Is this context initialized? Is the value in max_child_ack valid? + */ + int init; + + /** + * Maximum child ACK so far. + */ + uint32_t max_child_ack; + + /** + * Number of children nodes + */ + unsigned int nchildren; +}; + + +/** + * Info needed to work with tunnel paths and peers + */ +struct MeshPathInfo +{ + /** + * Tunnel + */ + struct MeshTunnel *t; + + /** + * Neighbouring peer to whom we send the packet to + */ + struct MeshPeerInfo *peer; + + /** + * Path itself + */ + struct MeshPeerPath *path; +}; + + +/** + * Struct containing information about a client of the service + */ +struct MeshClient +{ + /** + * Linked list next + */ + struct MeshClient *next; + + /** + * Linked list prev + */ + struct MeshClient *prev; + + /** + * Tunnels that belong to this client, indexed by local id + */ + struct GNUNET_CONTAINER_MultiHashMap *own_tunnels; + + /** + * Tunnels this client has accepted, indexed by incoming local id + */ + struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels; + + /** + * Tunnels this client has rejected, indexed by incoming local id + */ + struct GNUNET_CONTAINER_MultiHashMap *ignore_tunnels; + /** + * Handle to communicate with the client + */ + struct GNUNET_SERVER_Client *handle; + + /** + * Applications that this client has claimed to provide + */ + struct GNUNET_CONTAINER_MultiHashMap *apps; + + /** + * Messages that this client has declared interest in + */ + struct GNUNET_CONTAINER_MultiHashMap *types; + + /** + * Whether the client is active or shutting down (don't send confirmations + * to a client that is shutting down. + */ + int shutting_down; + + /** + * ID of the client, mainly for debug messages + */ + unsigned int id; + + /** + * Regular expressions describing the services offered by this client. + */ + struct MeshRegexDescriptor *regexes; // FIXME regex add timeout? API to remove a regex? + + /** + * Number of regular expressions in regexes. + */ + unsigned int n_regex; + + /** + * Task to refresh all regular expresions in the DHT. + */ + GNUNET_SCHEDULER_TaskIdentifier regex_announce_task; + + /** + * Tmp store for partially retrieved regex. + */ + char *partial_regex; + +}; + + +/******************************************************************************/ +/************************ DEBUG FUNCTIONS ****************************/ +/******************************************************************************/ + +#if MESH_DEBUG +/** + * GNUNET_SCHEDULER_Task for printing a message after some operation is done + * @param cls string to print + * @param success GNUNET_OK if the PUT was transmitted, + * GNUNET_NO on timeout, + * GNUNET_SYSERR on disconnect from service + * after the PUT message was transmitted + * (so we don't know if it was received or not) + */ + +#if 0 +static void +mesh_debug (void *cls, int success) +{ + char *s = cls; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success); +} +#endif + +unsigned int debug_fwd_ack; +unsigned int debug_bck_ack; + +#endif + +/******************************************************************************/ +/*********************** GLOBAL VARIABLES ****************************/ +/******************************************************************************/ + +/************************** Configuration parameters **************************/ + +/** + * How often to send tunnel keepalives. Tunnels timeout after 4 missed. + */ +static struct GNUNET_TIME_Relative refresh_path_time; + +/** + * How often to PUT local application numbers in the DHT. + */ +static struct GNUNET_TIME_Relative app_announce_time; + +/** + * How often to PUT own ID in the DHT. + */ +static struct GNUNET_TIME_Relative id_announce_time; + +/** + * Maximum time allowed to connect to a peer found by string. + */ +static struct GNUNET_TIME_Relative connect_timeout; + +/** + * Default TTL for payload packets. + */ +static unsigned long long default_ttl; + +/** + * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put. + */ +static unsigned long long dht_replication_level; + +/** + * How many tunnels are we willing to maintain. + * Local tunnels are always allowed, even if there are more tunnels than max. + */ +static unsigned long long max_tunnels; + +/** + * How many messages *in total* are we willing to queue, divided by number of + * tunnels to get tunnel queue size. + */ +static unsigned long long max_msgs_queue; + +/** + * How many peers do we want to remember? + */ +static unsigned long long max_peers; + + +/*************************** Static global variables **************************/ + +/** + * Hostkey generation context + */ +static struct GNUNET_CRYPTO_RsaKeyGenerationContext *keygen; + +/** + * DLL with all the clients, head. + */ +static struct MeshClient *clients; + +/** + * DLL with all the clients, tail. + */ +static struct MeshClient *clients_tail; + +/** + * Tunnels known, indexed by MESH_TunnelID (MeshTunnel). + */ +static struct GNUNET_CONTAINER_MultiHashMap *tunnels; + +/** + * Number of tunnels known. + */ +static unsigned long long n_tunnels; + +/** + * Tunnels incoming, indexed by MESH_TunnelNumber + * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV). + */ +static struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels; + +/** + * Peers known, indexed by PeerIdentity (MeshPeerInfo). + */ +static struct GNUNET_CONTAINER_MultiHashMap *peers; + +/* + * Handle to communicate with transport + */ +// static struct GNUNET_TRANSPORT_Handle *transport_handle; + +/** + * Handle to communicate with core. + */ +static struct GNUNET_CORE_Handle *core_handle; + +/** + * Handle to use DHT. + */ +static struct GNUNET_DHT_Handle *dht_handle; + +/** + * Handle to server. + */ +static struct GNUNET_SERVER_Handle *server_handle; + +/** + * Handle to the statistics service. + */ +static struct GNUNET_STATISTICS_Handle *stats; + +/** + * Notification context, to send messages to local clients. + */ +static struct GNUNET_SERVER_NotificationContext *nc; + +/** + * Local peer own ID (memory efficient handle). + */ +static GNUNET_PEER_Id myid; + +/** + * Local peer own ID (full value). + */ +static struct GNUNET_PeerIdentity my_full_id; + +/** + * Own private key. + */ +static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key; + +/** + * Own public key. + */ +static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key; + +/** + * Tunnel ID for the next created tunnel (global tunnel number). + */ +static MESH_TunnelNumber next_tid; + +/** + * Tunnel ID for the next incoming tunnel (local tunnel number). + */ +static MESH_TunnelNumber next_local_tid; + +/** + * All application types provided by this peer. + */ +static struct GNUNET_CONTAINER_MultiHashMap *applications; + +/** + * All message types clients of this peer are interested in. + */ +static struct GNUNET_CONTAINER_MultiHashMap *types; + +/** + * Task to periodically announce provided applications. + */ +GNUNET_SCHEDULER_TaskIdentifier announce_applications_task; + +/** + * Task to periodically announce itself in the network. + */ +GNUNET_SCHEDULER_TaskIdentifier announce_id_task; + +/** + * Next ID to assign to a client. + */ +unsigned int next_client_id; + + +/******************************************************************************/ +/*********************** DECLARATIONS **************************/ +/******************************************************************************/ + +/** + * Function to process paths received for a new peer addition. The recorded + * paths form the initial tunnel, which can be optimized later. + * Called on each result obtained for the DHT search. + * + * @param cls closure + * @param exp when will this value expire + * @param key key of the result + * @param type type of the result + * @param size number of bytes in data + * @param data pointer to the result data + */ +static void +dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp, + const struct GNUNET_HashCode * key, + const struct GNUNET_PeerIdentity *get_path, + unsigned int get_path_length, + const struct GNUNET_PeerIdentity *put_path, + unsigned int put_path_length, enum GNUNET_BLOCK_Type type, + size_t size, const void *data); + + +/** + * Retrieve the MeshPeerInfo stucture associated with the peer, create one + * and insert it in the appropiate structures if the peer is not known yet. + * + * @param peer Full identity of the peer. + * + * @return Existing or newly created peer info. + */ +static struct MeshPeerInfo * +peer_info_get (const struct GNUNET_PeerIdentity *peer); + + +/** + * Retrieve the MeshPeerInfo stucture associated with the peer, create one + * and insert it in the appropiate structures if the peer is not known yet. + * + * @param peer Short identity of the peer. + * + * @return Existing or newly created peer info. + */ +static struct MeshPeerInfo * +peer_info_get_short (const GNUNET_PEER_Id peer); + + +/** + * Try to establish a new connection to this peer. + * Use the best path for the given tunnel. + * If the peer doesn't have any path to it yet, try to get one. + * If the peer already has some path, send a CREATE PATH towards it. + * + * @param peer PeerInfo of the peer. + * @param t Tunnel for which to create the path, if possible. + */ +static void +peer_info_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t); + + +/** + * Build a PeerPath from the paths returned from the DHT, reversing the paths + * to obtain a local peer -> destination path and interning the peer ids. + * + * @return Newly allocated and created path + */ +static struct MeshPeerPath * +path_build_from_dht (const struct GNUNET_PeerIdentity *get_path, + unsigned int get_path_length, + const struct GNUNET_PeerIdentity *put_path, + unsigned int put_path_length); + + +/** + * Adds a path to the peer_infos of all the peers in the path + * + * @param p Path to process. + * @param confirmed Whether we know if the path works or not. + */ +static void +path_add_to_peers (struct MeshPeerPath *p, int confirmed); + + +/** + * Add a peer to a tunnel, accomodating paths accordingly and initializing all + * needed rescources. + * If peer already exists, reevaluate shortest path and change if different. + * + * @param t Tunnel we want to add a new peer to + * @param peer PeerInfo of the peer being added + * + */ +static void +tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer); + + +/** + * Removes an explicit path from a tunnel, freeing all intermediate nodes + * that are no longer needed, as well as nodes of no longer reachable peers. + * The tunnel itself is also destoyed if results in a remote empty tunnel. + * + * @param t Tunnel from which to remove the path. + * @param peer Short id of the peer which should be removed. + */ +static void +tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer); + + +/** + * Search for a tunnel by global ID using full PeerIdentities. + * + * @param oid owner of the tunnel. + * @param tid global tunnel number. + * + * @return tunnel handler, NULL if doesn't exist. + */ +static struct MeshTunnel * +tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid); + + +/** + * Delete an active client from the tunnel. + * + * @param t Tunnel. + * @param c Client. + */ +static void +tunnel_delete_active_client (struct MeshTunnel *t, const struct MeshClient *c); + +/** + * Notify a tunnel that a connection has broken that affects at least + * some of its peers. + * + * @param t Tunnel affected. + * @param p1 Peer that got disconnected from p2. + * @param p2 Peer that got disconnected from p1. + * + * @return Short ID of the peer disconnected (either p1 or p2). + * 0 if the tunnel remained unaffected. + */ +static GNUNET_PEER_Id +tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1, + GNUNET_PEER_Id p2); + + +/** + * Get the current ack value for a tunnel, for data going from root to leaves, + * taking in account the tunnel mode and the status of all children and clients. + * + * @param t Tunnel. + * + * @return Maximum PID allowed. + */ +static uint32_t +tunnel_get_fwd_ack (struct MeshTunnel *t); + + +/** + * Add a client to a tunnel, initializing all needed data structures. + * + * @param t Tunnel to which add the client. + * @param c Client which to add to the tunnel. + */ +static void +tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c); + + +/** + * @brief Queue and pass message to core when possible. + * + * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status + * and accounts for it. In case the queue is full, the message is dropped and + * a break issued. + * + * Otherwise, message is treated as internal and allowed to go regardless of + * queue status. + * + * @param cls Closure (@c type dependant). It will be used by queue_send to + * build the message to be sent if not already prebuilt. + * @param type Type of the message, 0 for a raw message. + * @param size Size of the message. + * @param dst Neighbor to send message to. + * @param t Tunnel this message belongs to. + */ +static void +queue_add (void *cls, uint16_t type, size_t size, + struct MeshPeerInfo *dst, struct MeshTunnel *t); + + +/** + * Free a transmission that was already queued with all resources + * associated to the request. + * + * @param queue Queue handler to cancel. + * @param clear_cls Is it necessary to free associated cls? + */ +static void +queue_destroy (struct MeshPeerQueue *queue, int clear_cls); + + +/** + * @brief Get the next transmittable message from the queue. + * + * This will be the head, except in the case of being a data packet + * not allowed by the destination peer. + * + * @param peer Destination peer. + * + * @return The next viable MeshPeerQueue element to send to that peer. + * NULL when there are no transmittable messages. + */ +struct MeshPeerQueue * +queue_get_next (const struct MeshPeerInfo *peer); + + +/** + * Core callback to write a queued packet to core buffer + * + * @param cls Closure (peer info). + * @param size Number of bytes available in buf. + * @param buf Where the to write the message. + * + * @return number of bytes written to buf + */ +static size_t +queue_send (void *cls, size_t size, void *buf); + +/******************************************************************************/ +/************************ REGEX INTEGRATION ****************************/ +/******************************************************************************/ + +/** + * Cancel a mesh regex search and free resources. + */ +static void +regex_cancel_search (struct MeshRegexSearchInfo *regex_search) +{ + GNUNET_REGEX_search_cancel (regex_search->search_handle); + if (0 < regex_search->n_peers) + GNUNET_free (regex_search->peers); + if (GNUNET_SCHEDULER_NO_TASK != regex_search->timeout) + { + GNUNET_SCHEDULER_cancel(regex_search->timeout); + } + GNUNET_free (regex_search); +} + + +/** + * Function called if the connect attempt to a peer found via + * connect_by_string times out. Try to connect to another peer, if any. + * Otherwise try to reconnect to the same peer. + * + * @param cls Closure (info about regex search). + * @param tc TaskContext. + */ +static void +regex_connect_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshRegexSearchInfo *info = cls; + struct MeshPeerInfo *peer_info; + GNUNET_PEER_Id id; + GNUNET_PEER_Id old; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Regex connect timeout\n"); + info->timeout = GNUNET_SCHEDULER_NO_TASK; + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " due to shutdown\n"); + return; + } + + old = info->peer; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " timed out: %u\n", old); + + if (0 < info->n_peers) + { + // Select next peer, put current in that spot. + id = info->peers[info->i_peer]; + info->peers[info->i_peer] = info->peer; + info->i_peer = (info->i_peer + 1) % info->n_peers; + } + else + { + // Try to connect to same peer again. + id = info->peer; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " trying: %u\n", id); + + peer_info = peer_info_get_short(id); + tunnel_add_peer (info->t, peer_info); + if (old != id) + tunnel_delete_peer (info->t, old); + peer_info_connect (peer_info, info->t); + info->timeout = GNUNET_SCHEDULER_add_delayed (connect_timeout, + ®ex_connect_timeout, + info); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Regex connect timeout END\n"); +} + + +/** + * Function to process DHT string to regex matching. + * Called on each result obtained for the DHT search. + * + * @param cls Closure provided in GNUNET_REGEX_search. + * @param id Peer providing a regex that matches the string. + * @param get_path Path of the get request. + * @param get_path_length Lenght of get_path. + * @param put_path Path of the put request. + * @param put_path_length Length of the put_path. + */ +static void +regex_found_handler (void *cls, + const struct GNUNET_PeerIdentity *id, + const struct GNUNET_PeerIdentity *get_path, + unsigned int get_path_length, + const struct GNUNET_PeerIdentity *put_path, + unsigned int put_path_length) +{ + struct MeshRegexSearchInfo *info = cls; + struct MeshPeerPath *p; + struct MeshPeerInfo *peer_info; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got regex results from DHT!\n"); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", info->description); + + peer_info = peer_info_get (id); + p = path_build_from_dht (get_path, get_path_length, + put_path, put_path_length); + path_add_to_peers (p, GNUNET_NO); + path_destroy(p); + + tunnel_add_peer (info->t, peer_info); + peer_info_connect (peer_info, info->t); + if (0 == info->peer) + { + info->peer = peer_info->id; + } + else + { + GNUNET_array_append (info->peers, info->n_peers, peer_info->id); + } + + if (GNUNET_SCHEDULER_NO_TASK != info->timeout) + return; + + info->timeout = GNUNET_SCHEDULER_add_delayed (connect_timeout, + ®ex_connect_timeout, + info); + + return; +} + + +/** + * Store the regular expression describing a local service into the DHT. + * + * @param regex The regular expresion. + */ +static void +regex_put (struct MeshRegexDescriptor *regex) +{ + DEBUG_DHT (" regex_put (%s) start\n", regex->regex); + if (NULL == regex->h) + { + DEBUG_DHT (" first put, creating DFA\n"); + regex->h = GNUNET_REGEX_announce (dht_handle, + &my_full_id, + regex->regex, + regex->compression, + stats); + } + else + { + DEBUG_DHT (" not first put, using cached data\n"); + GNUNET_REGEX_reannounce (regex->h); + } + DEBUG_DHT (" regex_put (%s) end\n", regex->regex); +} + + +/** + * Periodically announce what applications are provided by local clients + * (by regex) + * + * @param cls closure + * @param tc task context + */ +static void +regex_announce (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshClient *c = cls; + unsigned int i; + + c->regex_announce_task = GNUNET_SCHEDULER_NO_TASK; + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + return; + DEBUG_DHT ("Starting PUT for regex\n"); + for (i = 0; i < c->n_regex; i++) + regex_put (&c->regexes[i]); + c->regex_announce_task = GNUNET_SCHEDULER_add_delayed (app_announce_time, + ®ex_announce, + cls); + DEBUG_DHT ("Finished PUT for regex\n"); +} + + +/******************************************************************************/ +/************************ PERIODIC FUNCTIONS ****************************/ +/******************************************************************************/ + +/** + * Announce iterator over for each application provided by the peer + * + * @param cls closure + * @param key current key code + * @param value value in the hash map + * @return GNUNET_YES if we should continue to + * iterate, + * GNUNET_NO if not. + */ +static int +announce_application (void *cls, const struct GNUNET_HashCode * key, void *value) +{ + struct PBlock block; + struct MeshClient *c; + + block.id = my_full_id; + c = GNUNET_CONTAINER_multihashmap_get (applications, key); + GNUNET_assert(NULL != c); + block.type = (long) GNUNET_CONTAINER_multihashmap_get (c->apps, key); + if (0 == block.type) + { + GNUNET_break(0); + return GNUNET_YES; + } + block.type = htonl (block.type); + + GNUNET_break (NULL != + GNUNET_DHT_put (dht_handle, key, + dht_replication_level, + GNUNET_DHT_RO_RECORD_ROUTE | + GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, + GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE, + sizeof (block), + (const char *) &block, + GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_HOURS), /* FIXME: this should be an option */ + app_announce_time, NULL, NULL)); + return GNUNET_OK; +} + + +/** + * Periodically announce what applications are provided by local clients + * (by type) + * + * @param cls closure + * @param tc task context + */ +static void +announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + { + announce_applications_task = GNUNET_SCHEDULER_NO_TASK; + return; + } + + DEBUG_DHT ("Starting PUT for apps\n"); + + GNUNET_CONTAINER_multihashmap_iterate (applications, &announce_application, + NULL); + announce_applications_task = + GNUNET_SCHEDULER_add_delayed (app_announce_time, &announce_applications, + cls); + DEBUG_DHT ("Finished PUT for apps\n"); +} + + +/** + * Periodically announce self id in the DHT + * + * @param cls closure + * @param tc task context + */ +static void +announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct PBlock block; + + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + { + announce_id_task = GNUNET_SCHEDULER_NO_TASK; + return; + } + /* TODO + * - Set data expiration in function of X + * - Adapt X to churn + */ + DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id)); + + block.id = my_full_id; + block.type = htonl (0); + GNUNET_DHT_put (dht_handle, /* DHT handle */ + &my_full_id.hashPubKey, /* Key to use */ + dht_replication_level, /* Replication level */ + GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */ + GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */ + sizeof (block), /* Size of the data */ + (const char *) &block, /* Data itself */ + GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */ + GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */ + NULL, /* Continuation */ + NULL); /* Continuation closure */ + announce_id_task = + GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls); +} + + +/******************************************************************************/ +/****************** GENERAL HELPER FUNCTIONS ************************/ +/******************************************************************************/ + +/** + * Decrements the reference counter and frees all resources if needed + * + * @param mesh_data Data Descriptor used in a multicast message. + * Freed no longer needed (last message). + */ +static void +data_descriptor_decrement_rc (struct MeshData *mesh_data) +{ + if (0 == --(mesh_data->reference_counter)) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Last copy!\n"); + GNUNET_free (mesh_data->data); + GNUNET_free (mesh_data); + } +} + + +/** + * Check if client has registered with the service and has not disconnected + * + * @param client the client to check + * + * @return non-NULL if client exists in the global DLL + */ +static struct MeshClient * +client_get (struct GNUNET_SERVER_Client *client) +{ + struct MeshClient *c; + + c = clients; + while (NULL != c) + { + if (c->handle == client) + return c; + c = c->next; + } + return NULL; +} + + +/** + * Checks if a given client has subscribed to certain message type + * + * @param message_type Type of message to check + * @param c Client to check + * + * @return GNUNET_YES or GNUNET_NO, depending on subscription status + * + * FIXME: use of crypto_hash slows it down + * The hash function alone takes 8-10us out of the ~55us for the whole + * process of retransmitting the message from one local client to another. + * Find faster implementation! + */ +static int +client_is_subscribed (uint16_t message_type, struct MeshClient *c) +{ + struct GNUNET_HashCode hc; + + if (NULL == c->types) + return GNUNET_NO; + + GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc); + return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc); +} + + +/** + * Check whether client wants traffic from a tunnel. + * + * @param c Client to check. + * @param t Tunnel to be found. + * + * @return GNUNET_YES if client knows tunnel. + * + * TODO look in client hashmap + */ +static int +client_wants_tunnel (struct MeshClient *c, struct MeshTunnel *t) +{ + unsigned int i; + + for (i = 0; i < t->nclients; i++) + if (t->clients[i] == c) + return GNUNET_YES; + return GNUNET_NO; +} + + +/** + * Check whether client has been informed about a tunnel. + * + * @param c Client to check. + * @param t Tunnel to be found. + * + * @return GNUNET_YES if client knows tunnel. + * + * TODO look in client hashmap + */ +static int +client_knows_tunnel (struct MeshClient *c, struct MeshTunnel *t) +{ + unsigned int i; + + for (i = 0; i < t->nignore; i++) + if (t->ignore[i] == c) + return GNUNET_YES; + return client_wants_tunnel(c, t); +} + + +/** + * Marks a client as uninterested in traffic from the tunnel, updating both + * client and tunnel to reflect this. + * + * @param c Client that doesn't want traffic anymore. + * @param t Tunnel which should be ignored. + * + * FIXME when to delete an incoming tunnel? + */ +static void +client_ignore_tunnel (struct MeshClient *c, struct MeshTunnel *t) +{ + struct GNUNET_HashCode hash; + + GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); + GNUNET_break (GNUNET_YES == + GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, + &hash, t)); + GNUNET_break (GNUNET_YES == + GNUNET_CONTAINER_multihashmap_put (c->ignore_tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); + tunnel_delete_active_client (t, c); + GNUNET_array_append (t->ignore, t->nignore, c); +} + + +/** + * Deletes a tunnel from a client (either owner or destination). To be used on + * tunnel destroy, otherwise, use client_ignore_tunnel. + * + * @param c Client whose tunnel to delete. + * @param t Tunnel which should be deleted. + */ +static void +client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t) +{ + struct GNUNET_HashCode hash; + + if (c == t->owner) + { + GNUNET_CRYPTO_hash(&t->local_tid, sizeof (MESH_TunnelNumber), &hash); + GNUNET_assert (GNUNET_YES == + GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels, + &hash, + t)); + } + else + { + GNUNET_CRYPTO_hash(&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); + // FIXME XOR? + GNUNET_assert (GNUNET_YES == + GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, + &hash, + t) || + GNUNET_YES == + GNUNET_CONTAINER_multihashmap_remove (c->ignore_tunnels, + &hash, + t)); + } +} + + +/** + * Notify the owner of a tunnel that a peer has disconnected. + * + * @param c Client (owner of tunnel). + * @param t Tunnel this message is about. + * @param peer_id Short ID of the disconnected peer. + */ +void +client_notify_peer_disconnected (struct MeshClient *c, + struct MeshTunnel *t, + GNUNET_PEER_Id peer_id) +{ + struct GNUNET_MESH_PeerControl msg; + + if (NULL == t->owner || NULL == nc) + return; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL); + msg.tunnel_id = htonl (t->local_tid); + GNUNET_PEER_resolve (peer_id, &msg.peer); + GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, + &msg.header, GNUNET_NO); +} + + +/** + * Send the message to all clients that have subscribed to its type + * + * @param msg Pointer to the message itself + * @param payload Pointer to the payload of the message. + * @param t The tunnel to whose clients this message goes. + * + * @return number of clients this message was sent to + */ +static unsigned int +send_subscribed_clients (const struct GNUNET_MessageHeader *msg, + const struct GNUNET_MessageHeader *payload, + struct MeshTunnel *t) +{ + struct MeshClient *c; + MESH_TunnelNumber *tid; + unsigned int count; + uint16_t type; + char cbuf[htons (msg->size)]; + + type = ntohs (payload->type); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending to clients...\n"); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "message of type %s\n", + GNUNET_MESH_DEBUG_M2S (type)); + + memcpy (cbuf, msg, sizeof (cbuf)); + switch (htons (msg->type)) + { + struct GNUNET_MESH_Unicast *uc; + struct GNUNET_MESH_Multicast *mc; + struct GNUNET_MESH_ToOrigin *to; + + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + uc = (struct GNUNET_MESH_Unicast *) cbuf; + tid = &uc->tid; + break; + case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: + mc = (struct GNUNET_MESH_Multicast *) cbuf; + tid = &mc->tid; + break; + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + to = (struct GNUNET_MESH_ToOrigin *) cbuf; + tid = &to->tid; + break; + default: + GNUNET_break (0); + return 0; + } + + for (count = 0, c = clients; c != NULL; c = c->next) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client %u\n", c->id); + if (client_is_subscribed (type, c)) + { + if (htons (msg->type) == GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN) + { + if (c != t->owner) + continue; + *tid = htonl (t->local_tid); + } + else + { + if (GNUNET_NO == client_knows_tunnel (c, t)) + { + /* This client doesn't know the tunnel */ + struct GNUNET_MESH_TunnelNotification tmsg; + struct GNUNET_HashCode hash; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending tunnel create\n"); + tmsg.header.size = htons (sizeof (tmsg)); + tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE); + GNUNET_PEER_resolve (t->id.oid, &tmsg.peer); + tmsg.tunnel_id = htonl (t->local_tid_dest); + tmsg.opt = 0; + if (GNUNET_YES == t->speed_min) + tmsg.opt |= MESH_TUNNEL_OPT_SPEED_MIN; + if (GNUNET_YES == t->nobuffer) + tmsg.opt |= MESH_TUNNEL_OPT_NOBUFFER; + GNUNET_SERVER_notification_context_unicast (nc, c->handle, + &tmsg.header, GNUNET_NO); + tunnel_add_client (t, c); + GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), + &hash); + GNUNET_break (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put ( + c->incoming_tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); + } + *tid = htonl (t->local_tid_dest); + } + + /* Check if the client wants to get traffic from the tunnel */ + if (GNUNET_NO == client_wants_tunnel(c, t)) + continue; + count++; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending\n"); + GNUNET_SERVER_notification_context_unicast (nc, c->handle, + (struct GNUNET_MessageHeader + *) cbuf, GNUNET_NO); + } + } + + return count; +} + + +/** + * Notify the client that owns the tunnel that a peer has connected to it + * (the requested path to it has been confirmed). + * + * @param t Tunnel whose owner to notify + * @param id Short id of the peer that has connected + */ +static void +send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id) +{ + struct GNUNET_MESH_PeerControl pc; + + if (NULL == t->owner || GNUNET_YES == t->destroy) + return; + + pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD); + pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); + pc.tunnel_id = htonl (t->local_tid); + GNUNET_PEER_resolve (id, &pc.peer); + GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, &pc.header, + GNUNET_NO); +} + + +/** + * Notify all clients (not depending on registration status) that the incoming + * tunnel is no longer valid. + * + * @param t Tunnel that was destroyed. + */ +static void +send_clients_tunnel_destroy (struct MeshTunnel *t) +{ + struct GNUNET_MESH_TunnelMessage msg; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); + msg.tunnel_id = htonl (t->local_tid_dest); + GNUNET_SERVER_notification_context_broadcast (nc, &msg.header, GNUNET_NO); +} + + +/** + * Notify clients of tunnel disconnections, if needed. + * In case the origin disconnects, the destination clients get a tunnel destroy + * notification. If the last destination disconnects (only one remaining client + * in tunnel), the origin gets a (local ID) peer disconnected. + * Note that the function must be called BEFORE removing the client from + * the tunnel. + * + * @param t Tunnel that was destroyed. + * @param c Client that disconnected. + */ +static void +send_client_tunnel_disconnect (struct MeshTunnel *t, struct MeshClient *c) +{ + unsigned int i; + + if (c == t->owner) + { + struct GNUNET_MESH_TunnelMessage msg; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); + msg.tunnel_id = htonl (t->local_tid_dest); + for (i = 0; i < t->nclients; i++) + GNUNET_SERVER_notification_context_unicast (nc, t->clients[i]->handle, + &msg.header, GNUNET_NO); + } + // FIXME when to disconnect an incoming tunnel? + else if (1 == t->nclients && NULL != t->owner) + { + struct GNUNET_MESH_PeerControl msg; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL); + msg.tunnel_id = htonl (t->local_tid); + msg.peer = my_full_id; + GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, + &msg.header, GNUNET_NO); + } +} + + +/** + * Iterator over all the peers to remove the oldest not-used entry. + * + * @param cls Closure (unsued). + * @param key ID of the peer. + * @param value Peer_Info of the peer. + * + * FIXME implement + */ +static int +peer_info_timeout (void *cls, + const struct GNUNET_HashCode *key, + void *value) +{ + return GNUNET_YES; +} + +/** + * Retrieve the MeshPeerInfo stucture associated with the peer, create one + * and insert it in the appropiate structures if the peer is not known yet. + * + * @param peer Full identity of the peer. + * + * @return Existing or newly created peer info. + */ +static struct MeshPeerInfo * +peer_info_get (const struct GNUNET_PeerIdentity *peer) +{ + struct MeshPeerInfo *peer_info; + + peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); + if (NULL == peer_info) + { + peer_info = + (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo)); + if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers) + { + GNUNET_CONTAINER_multihashmap_iterate (peers, + &peer_info_timeout, + NULL); + } + GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); + peer_info->id = GNUNET_PEER_intern (peer); + } + peer_info->last_contact = GNUNET_TIME_absolute_get(); + + return peer_info; +} + + +/** + * Retrieve the MeshPeerInfo stucture associated with the peer, create one + * and insert it in the appropiate structures if the peer is not known yet. + * + * @param peer Short identity of the peer. + * + * @return Existing or newly created peer info. + */ +static struct MeshPeerInfo * +peer_info_get_short (const GNUNET_PEER_Id peer) +{ + struct GNUNET_PeerIdentity id; + + GNUNET_PEER_resolve (peer, &id); + return peer_info_get (&id); +} + + +/** + * Iterator to remove the tunnel from the list of tunnels a peer participates + * in. + * + * @param cls Closure (tunnel info) + * @param key GNUNET_PeerIdentity of the peer (unused) + * @param value PeerInfo of the peer + * + * @return always GNUNET_YES, to keep iterating + */ +static int +peer_info_delete_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value) +{ + struct MeshTunnel *t = cls; + struct MeshPeerInfo *peer = value; + unsigned int i; + + for (i = 0; i < peer->ntunnels; i++) + { + if (0 == + memcmp (&peer->tunnels[i]->id, &t->id, sizeof (struct MESH_TunnelID))) + { + peer->ntunnels--; + peer->tunnels[i] = peer->tunnels[peer->ntunnels]; + peer->tunnels = GNUNET_realloc (peer->tunnels, peer->ntunnels); + return GNUNET_YES; + } + } + return GNUNET_YES; +} + + +/** + * Core callback to write a pre-constructed data packet to core buffer + * + * @param cls Closure (MeshTransmissionDescriptor with data in "data" member). + * @param size Number of bytes available in buf. + * @param buf Where the to write the message. + * + * @return number of bytes written to buf + */ +static size_t +send_core_data_raw (void *cls, size_t size, void *buf) +{ + struct MeshTransmissionDescriptor *info = cls; + struct GNUNET_MessageHeader *msg; + size_t total_size; + + GNUNET_assert (NULL != info); + GNUNET_assert (NULL != info->mesh_data); + msg = (struct GNUNET_MessageHeader *) info->mesh_data->data; + total_size = ntohs (msg->size); + + if (total_size > size) + { + GNUNET_break (0); + return 0; + } + memcpy (buf, msg, total_size); + data_descriptor_decrement_rc (info->mesh_data); + GNUNET_free (info); + return total_size; +} + + +/** + * Sends an already built non-multicast message to a peer, + * properly registrating all used resources. + * + * @param message Message to send. Function makes a copy of it. + * @param peer Short ID of the neighbor whom to send the message. + * @param t Tunnel on which this message is transmitted. + */ +static void +send_prebuilt_message (const struct GNUNET_MessageHeader *message, + const struct GNUNET_PeerIdentity *peer, + struct MeshTunnel *t) +{ + struct MeshTransmissionDescriptor *info; + struct MeshPeerInfo *neighbor; + struct MeshPeerPath *p; + size_t size; + uint16_t type; + +// GNUNET_TRANSPORT_try_connect(); FIXME use? + + size = ntohs (message->size); + info = GNUNET_malloc (sizeof (struct MeshTransmissionDescriptor)); + info->mesh_data = GNUNET_malloc (sizeof (struct MeshData)); + info->mesh_data->data = GNUNET_malloc (size); + memcpy (info->mesh_data->data, message, size); + type = ntohs(message->type); + switch (type) + { + struct GNUNET_MESH_Unicast *m; + struct GNUNET_MESH_ToOrigin *to; + + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + m = (struct GNUNET_MESH_Unicast *) info->mesh_data->data; + m->ttl = htonl (ntohl (m->ttl) - 1); + break; + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + to = (struct GNUNET_MESH_ToOrigin *) info->mesh_data->data; + t->bck_pid++; + to->pid = htonl(t->bck_pid); + } + info->mesh_data->data_len = size; + info->mesh_data->reference_counter = 1; + info->mesh_data->total_out = 1; + neighbor = peer_info_get (peer); + for (p = neighbor->path_head; NULL != p; p = p->next) + { + if (2 >= p->length) + { + break; + } + } + if (NULL == p) + { +#if MESH_DEBUG + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " %s IS NOT DIRECTLY CONNECTED\n", + GNUNET_i2s(peer)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " PATHS TO %s:\n", + GNUNET_i2s(peer)); + for (p = neighbor->path_head; NULL != p; p = p->next) + { + struct GNUNET_PeerIdentity debug_id; + unsigned int i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " path with %u hops through:\n", + p->length); + for (i = 0; i < p->length; i++) + { + GNUNET_PEER_resolve(p->peers[i], &debug_id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " hop %u: %s\n", + i, GNUNET_i2s(&debug_id)); + } + } +#endif + GNUNET_break (0); // FIXME sometimes fails (testing disconnect?) + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + " no direct connection to %s\n", + GNUNET_i2s (peer)); + GNUNET_free (info->mesh_data->data); + GNUNET_free (info->mesh_data); + GNUNET_free (info); + return; + } + info->peer = neighbor; + if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type) + type = 0; + queue_add (info, + type, + size, + neighbor, + t); +} + + +/** + * Sends a CREATE PATH message for a path to a peer, properly registrating + * all used resources. + * + * @param peer PeerInfo of the final peer for whom this path is being created. + * @param p Path itself. + * @param t Tunnel for which the path is created. + */ +static void +send_create_path (struct MeshPeerInfo *peer, struct MeshPeerPath *p, + struct MeshTunnel *t) +{ + struct GNUNET_PeerIdentity id; + struct MeshPathInfo *path_info; + struct MeshPeerInfo *neighbor; + + unsigned int i; + + if (NULL == p) + { + p = tree_get_path_to_peer (t->tree, peer->id); + if (NULL == p) + { + GNUNET_break (0); + return; + } + } + for (i = 0; i < p->length; i++) + { + if (p->peers[i] == myid) + break; + } + if (i >= p->length - 1) + { + path_destroy (p); + GNUNET_break (0); + return; + } + GNUNET_PEER_resolve (p->peers[i + 1], &id); + + path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); + path_info->path = p; + path_info->t = t; + neighbor = peer_info_get (&id); + path_info->peer = neighbor; + queue_add (path_info, + GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, + sizeof (struct GNUNET_MESH_ManipulatePath) + + (p->length * sizeof (struct GNUNET_PeerIdentity)), + neighbor, + t); +} + + +/** + * Sends a DESTROY PATH message to free resources for a path in a tunnel + * + * @param t Tunnel whose path to destroy. + * @param destination Short ID of the peer to whom the path to destroy. + */ +static void +send_destroy_path (struct MeshTunnel *t, GNUNET_PEER_Id destination) +{ + struct MeshPeerPath *p; + size_t size; + + p = tree_get_path_to_peer (t->tree, destination); + if (NULL == p) + { + GNUNET_break (0); + return; + } + size = sizeof (struct GNUNET_MESH_ManipulatePath); + size += p->length * sizeof (struct GNUNET_PeerIdentity); + { + struct GNUNET_MESH_ManipulatePath *msg; + struct GNUNET_PeerIdentity *pi; + char cbuf[size]; + unsigned int i; + + msg = (struct GNUNET_MESH_ManipulatePath *) cbuf; + msg->header.size = htons (size); + msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY); + msg->tid = htonl (t->id.tid); + pi = (struct GNUNET_PeerIdentity *) &msg[1]; + for (i = 0; i < p->length; i++) + { + GNUNET_PEER_resolve (p->peers[i], &pi[i]); + } + send_prebuilt_message (&msg->header, tree_get_first_hop (t->tree, destination), t); + } + path_destroy (p); +} + + +/** + * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us. + * + * @param t Tunnel which to confirm. + */ +static void +send_path_ack (struct MeshTunnel *t) +{ + struct MeshTransmissionDescriptor *info; + struct GNUNET_PeerIdentity id; + GNUNET_PEER_Id peer; + + peer = tree_get_predecessor (t->tree); + GNUNET_PEER_resolve (peer, &id); + info = GNUNET_malloc (sizeof (struct MeshTransmissionDescriptor)); + info->origin = &t->id; + info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey); + GNUNET_assert (NULL != info->peer); + + queue_add (info, + GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, + sizeof (struct GNUNET_MESH_PathACK), + info->peer, + t); +} + + +/** + * Try to establish a new connection to this peer. + * Use the best path for the given tunnel. + * If the peer doesn't have any path to it yet, try to get one. + * If the peer already has some path, send a CREATE PATH towards it. + * + * @param peer PeerInfo of the peer. + * @param t Tunnel for which to create the path, if possible. + */ +static void +peer_info_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t) +{ + struct MeshPeerPath *p; + struct MeshPathInfo *path_info; + + if (NULL != peer->path_head) + { + p = tree_get_path_to_peer (t->tree, peer->id); + if (NULL == p) + { + GNUNET_break (0); + return; + } + + // FIXME always send create path to self + if (p->length > 1) + { + send_create_path (peer, p, t); + } + else + { + struct GNUNET_HashCode hash; + + path_destroy (p); + send_client_peer_connected (t, myid); + t->local_tid_dest = next_local_tid++; + GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), + &hash); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) + { + GNUNET_break (0); + return; + } + } + } + else if (NULL == peer->dhtget) + { + struct GNUNET_PeerIdentity id; + + GNUNET_PEER_resolve (peer->id, &id); + path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); + path_info->peer = peer; + path_info->t = t; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Starting DHT GET for peer %s\n", GNUNET_i2s (&id)); + peer->dhtgetcls = path_info; + peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */ + GNUNET_BLOCK_TYPE_MESH_PEER, /* type */ + &id.hashPubKey, /* key to search */ + dht_replication_level, /* replication level */ + GNUNET_DHT_RO_RECORD_ROUTE | + GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, + NULL, /* xquery */ // FIXME BLOOMFILTER + 0, /* xquery bits */ // FIXME BLOOMFILTER SIZE + &dht_get_id_handler, path_info); + } + /* Otherwise, there is no path but the DHT get is already started. */ +} + + +/** + * Task to delay the connection of a peer + * + * @param cls Closure (path info with tunnel and peer to connect). + * Will be free'd on exection. + * @param tc TaskContext + */ +static void +peer_info_connect_task (void *cls, + const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshPathInfo *path_info = cls; + + path_info->peer->connect_task = GNUNET_SCHEDULER_NO_TASK; + + if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason)) + { + GNUNET_free (cls); + return; + } + peer_info_connect (path_info->peer, path_info->t); + GNUNET_free (cls); +} + + +/** + * Destroy the peer_info and free any allocated resources linked to it + * + * @param pi The peer_info to destroy. + * + * @return GNUNET_OK on success + */ +static int +peer_info_destroy (struct MeshPeerInfo *pi) +{ + struct GNUNET_PeerIdentity id; + struct MeshPeerPath *p; + struct MeshPeerPath *nextp; + + GNUNET_PEER_resolve (pi->id, &id); + GNUNET_PEER_change_rc (pi->id, -1); + + if (GNUNET_YES != + GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi)) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "removing peer %s, not in hashmap\n", GNUNET_i2s (&id)); + } + if (NULL != pi->dhtget) + { + GNUNET_DHT_get_stop (pi->dhtget); + GNUNET_free (pi->dhtgetcls); + } + p = pi->path_head; + while (NULL != p) + { + nextp = p->next; + GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p); + path_destroy (p); + p = nextp; + } + if (GNUNET_SCHEDULER_NO_TASK != pi->connect_task) + { + GNUNET_free (GNUNET_SCHEDULER_cancel (pi->connect_task)); + } + GNUNET_free (pi); + return GNUNET_OK; +} + + +/** + * Remove all paths that rely on a direct connection between p1 and p2 + * from the peer itself and notify all tunnels about it. + * + * @param peer PeerInfo of affected peer. + * @param p1 GNUNET_PEER_Id of one peer. + * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and + * no longer is. + * + * TODO: optimize (see below) + */ +static void +peer_info_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1, + GNUNET_PEER_Id p2) +{ + struct MeshPeerPath *p; + struct MeshPeerPath *aux; + struct MeshPeerInfo *peer_d; + GNUNET_PEER_Id d; + unsigned int destroyed; + unsigned int best; + unsigned int cost; + unsigned int i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n"); + destroyed = 0; + p = peer->path_head; + while (NULL != p) + { + aux = p->next; + for (i = 0; i < (p->length - 1); i++) + { + if ((p->peers[i] == p1 && p->peers[i + 1] == p2) || + (p->peers[i] == p2 && p->peers[i + 1] == p1)) + { + GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p); + path_destroy (p); + destroyed++; + break; + } + } + p = aux; + } + if (0 == destroyed) + return; + + for (i = 0; i < peer->ntunnels; i++) + { + d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2); + if (0 == d) + continue; + /* TODO + * Problem: one or more peers have been deleted from the tunnel tree. + * We don't know who they are to try to add them again. + * We need to try to find a new path for each of the disconnected peers. + * Some of them might already have a path to reach them that does not + * involve p1 and p2. Adding all anew might render in a better tree than + * the trivial immediate fix. + * + * Trivial immiediate fix: try to reconnect to the disconnected node. All + * its children will be reachable trough him. + */ + peer_d = peer_info_get_short (d); + best = UINT_MAX; + aux = NULL; + for (p = peer_d->path_head; NULL != p; p = p->next) + { + if ((cost = tree_get_path_cost (peer->tunnels[i]->tree, p)) < best) + { + best = cost; + aux = p; + } + } + if (NULL != aux) + { + /* No callback, as peer will be already disconnected and a connection + * scheduled by tunnel_notify_connection_broken. + */ + tree_add_path (peer->tunnels[i]->tree, aux, NULL, NULL); + } + else + { + peer_info_connect (peer_d, peer->tunnels[i]); + } + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n"); +} + + +/** + * Add the path to the peer and update the path used to reach it in case this + * is the shortest. + * + * @param peer_info Destination peer to add the path to. + * @param path New path to add. Last peer must be the peer in arg 1. + * Path will be either used of freed if already known. + * @param trusted Do we trust that this path is real? + */ +void +peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path, + int trusted) +{ + struct MeshPeerPath *aux; + unsigned int l; + unsigned int l2; + + if ((NULL == peer_info) || (NULL == path)) + { + GNUNET_break (0); + path_destroy (path); + return; + } + if (path->peers[path->length - 1] != peer_info->id) + { + GNUNET_break (0); + path_destroy (path); + return; + } + if (path->length <= 2 && GNUNET_NO == trusted) + { + /* Only allow CORE to tell us about direct paths */ + path_destroy (path); + return; + } + GNUNET_assert (peer_info->id == path->peers[path->length - 1]); + for (l = 1; l < path->length; l++) + { + if (path->peers[l] == myid) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l); + for (l2 = 0; l2 < path->length - l; l2++) + { + path->peers[l2] = path->peers[l + l2]; + } + path->length -= l; + l = 1; + path->peers = + GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id)); + } + } +#if MESH_DEBUG + { + struct GNUNET_PeerIdentity id; + + GNUNET_PEER_resolve (peer_info->id, &id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n", + path->length, GNUNET_i2s (&id)); + } +#endif + l = path_get_length (path); + if (0 == l) + { + GNUNET_free (path); + return; + } + + GNUNET_assert (peer_info->id == path->peers[path->length - 1]); + for (aux = peer_info->path_head; aux != NULL; aux = aux->next) + { + l2 = path_get_length (aux); + if (l2 > l) + { + GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head, + peer_info->path_tail, aux, path); + return; + } + else + { + if (l2 == l && memcmp (path->peers, aux->peers, l) == 0) + { + path_destroy (path); + return; + } + } + } + GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail, + path); + return; +} + + +/** + * Add the path to the origin peer and update the path used to reach it in case + * this is the shortest. + * The path is given in peer_info -> destination, therefore we turn the path + * upside down first. + * + * @param peer_info Peer to add the path to, being the origin of the path. + * @param path New path to add after being inversed. + * @param trusted Do we trust that this path is real? + */ +static void +peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info, + struct MeshPeerPath *path, int trusted) +{ + path_invert (path); + peer_info_add_path (peer_info, path, trusted); +} + + +/** + * Function called if the connection to the peer has been stalled for a while, + * possibly due to a missed ACK. Poll the peer about its ACK status. + * + * @param cls Closure (cinfo). + * @param tc TaskContext. + */ +static void +tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshTunnelChildInfo *cinfo = cls; + struct GNUNET_MESH_Poll msg; + struct GNUNET_PeerIdentity id; + struct MeshTunnel *t; + + cinfo->fc_poll = GNUNET_SCHEDULER_NO_TASK; + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + { + return; + } + + t = cinfo->t; + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL); + msg.header.size = htons (sizeof (msg)); + msg.tid = htonl (t->id.tid); + GNUNET_PEER_resolve (t->id.oid, &msg.oid); + msg.last_ack = htonl (cinfo->fwd_ack); + + GNUNET_PEER_resolve (cinfo->id, &id); + send_prebuilt_message (&msg.header, &id, cinfo->t); + cinfo->fc_poll_time = GNUNET_TIME_relative_min ( + MESH_MAX_POLL_TIME, + GNUNET_TIME_relative_multiply (cinfo->fc_poll_time, 2)); + cinfo->fc_poll = GNUNET_SCHEDULER_add_delayed (cinfo->fc_poll_time, + &tunnel_poll, cinfo); +} + + +/** + * Build a PeerPath from the paths returned from the DHT, reversing the paths + * to obtain a local peer -> destination path and interning the peer ids. + * + * @return Newly allocated and created path + */ +static struct MeshPeerPath * +path_build_from_dht (const struct GNUNET_PeerIdentity *get_path, + unsigned int get_path_length, + const struct GNUNET_PeerIdentity *put_path, + unsigned int put_path_length) +{ + struct MeshPeerPath *p; + GNUNET_PEER_Id id; + int i; + + p = path_new (1); + p->peers[0] = myid; + GNUNET_PEER_change_rc (myid, 1); + i = get_path_length; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i); + for (i--; i >= 0; i--) + { + id = GNUNET_PEER_intern (&get_path[i]); + if (p->length > 0 && id == p->peers[p->length - 1]) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n"); + GNUNET_PEER_change_rc (id, -1); + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n", + GNUNET_i2s (&get_path[i])); + p->length++; + p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length); + p->peers[p->length - 1] = id; + } + } + i = put_path_length; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i); + for (i--; i >= 0; i--) + { + id = GNUNET_PEER_intern (&put_path[i]); + if (id == myid) + { + /* PUT path went through us, so discard the path up until now and start + * from here to get a much shorter (and loop-free) path. + */ + path_destroy (p); + p = path_new (0); + } + if (p->length > 0 && id == p->peers[p->length - 1]) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n"); + GNUNET_PEER_change_rc (id, -1); + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n", + GNUNET_i2s (&put_path[i])); + p->length++; + p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length); + p->peers[p->length - 1] = id; + } + } +#if MESH_DEBUG + if (get_path_length > 0) + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n", + GNUNET_i2s (&get_path[0])); + if (put_path_length > 0) + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n", + GNUNET_i2s (&put_path[0])); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n", + p->length); + for (i = 0; i < p->length; i++) + { + struct GNUNET_PeerIdentity peer_id; + + GNUNET_PEER_resolve (p->peers[i], &peer_id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i], + GNUNET_i2s (&peer_id)); + } +#endif + return p; +} + + +/** + * Adds a path to the peer_infos of all the peers in the path + * + * @param p Path to process. + * @param confirmed Whether we know if the path works or not. + */ +static void +path_add_to_peers (struct MeshPeerPath *p, int confirmed) +{ + unsigned int i; + + /* TODO: invert and add */ + for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ; + for (i++; i < p->length; i++) + { + struct MeshPeerInfo *aux; + struct MeshPeerPath *copy; + + aux = peer_info_get_short (p->peers[i]); + copy = path_duplicate (p); + copy->length = i + 1; + peer_info_add_path (aux, copy, GNUNET_NO); + } +} + + +/** + * Send keepalive packets for a peer + * + * @param cls Closure (tunnel for which to send the keepalive). + * @param tc Notification context. + * + * TODO: implement explicit multicast keepalive? + */ +static void +path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); + + +/** + * Search for a tunnel among the incoming tunnels + * + * @param tid the local id of the tunnel + * + * @return tunnel handler, NULL if doesn't exist + */ +static struct MeshTunnel * +tunnel_get_incoming (MESH_TunnelNumber tid) +{ + struct GNUNET_HashCode hash; + + GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV); + GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash); + return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash); +} + + +/** + * Search for a tunnel among the tunnels for a client + * + * @param c the client whose tunnels to search in + * @param tid the local id of the tunnel + * + * @return tunnel handler, NULL if doesn't exist + */ +static struct MeshTunnel * +tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid) +{ + if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) + { + return tunnel_get_incoming (tid); + } + else + { + struct GNUNET_HashCode hash; + + GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash); + return GNUNET_CONTAINER_multihashmap_get (c->own_tunnels, &hash); + } +} + + +/** + * Search for a tunnel by global ID using PEER_ID + * + * @param pi owner of the tunnel + * @param tid global tunnel number + * + * @return tunnel handler, NULL if doesn't exist + */ +static struct MeshTunnel * +tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid) +{ + struct MESH_TunnelID id; + struct GNUNET_HashCode hash; + + id.oid = pi; + id.tid = tid; + + GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash); + return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash); +} + + +/** + * Search for a tunnel by global ID using full PeerIdentities + * + * @param oid owner of the tunnel + * @param tid global tunnel number + * + * @return tunnel handler, NULL if doesn't exist + */ +static struct MeshTunnel * +tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid) +{ + return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid); +} + + +/** + * Delete an active client from the tunnel. + * + * @param t Tunnel. + * @param c Client. + */ +static void +tunnel_delete_active_client (struct MeshTunnel *t, const struct MeshClient *c) +{ + unsigned int i; + + for (i = 0; i < t->nclients; i++) + { + if (t->clients[i] == c) + { + t->clients[i] = t->clients[t->nclients - 1]; + t->clients_fc[i] = t->clients_fc[t->nclients - 1]; + GNUNET_array_grow (t->clients, t->nclients, t->nclients - 1); + t->nclients++; + GNUNET_array_grow (t->clients_fc, t->nclients, t->nclients - 1); + break; + } + } +} + + +/** + * Delete an ignored client from the tunnel. + * + * @param t Tunnel. + * @param c Client. + */ +static void +tunnel_delete_ignored_client (struct MeshTunnel *t, const struct MeshClient *c) +{ + unsigned int i; + + for (i = 0; i < t->nignore; i++) + { + if (t->ignore[i] == c) + { + t->ignore[i] = t->ignore[t->nignore - 1]; + GNUNET_array_grow (t->ignore, t->nignore, t->nignore - 1); + break; + } + } +} + + +/** + * Delete a client from the tunnel. It should be only done on + * client disconnection, otherwise use client_ignore_tunnel. + * + * @param t Tunnel. + * @param c Client. + */ +static void +tunnel_delete_client (struct MeshTunnel *t, const struct MeshClient *c) +{ + tunnel_delete_ignored_client (t, c); + tunnel_delete_active_client (t, c); +} + + +/** + * @brief Iterator to destroy MeshTunnelChildInfo of tunnel children. + * + * Destroys queue elements of all waiting transmissions and frees all memory + * used by the struct and its elements. + * + * @param cls Closure (tunnel info). + * @param key Hash of GNUNET_PEER_Id (unused). + * @param value MeshTunnelChildInfo of the child. + * + * @return always GNUNET_YES, to keep iterating + */ +static int +tunnel_destroy_child (void *cls, + const struct GNUNET_HashCode * key, + void *value) +{ + struct MeshTunnelChildInfo *cinfo = value; + struct MeshTunnel *t = cls; + struct MeshPeerQueue *q; + unsigned int c; + unsigned int i; + + for (c = 0; c < cinfo->send_buffer_n; c++) + { + i = (cinfo->send_buffer_start + c) % t->fwd_queue_max; + q = cinfo->send_buffer[i]; + cinfo->send_buffer[i] = NULL; + if (NULL != q) + queue_destroy (q, GNUNET_YES); + else + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, "%u %u\n", c, cinfo->send_buffer_n); + } + GNUNET_free_non_null (cinfo->send_buffer); + if (GNUNET_SCHEDULER_NO_TASK != cinfo->fc_poll) + { + GNUNET_SCHEDULER_cancel (cinfo->fc_poll); + cinfo->fc_poll = GNUNET_SCHEDULER_NO_TASK; + } + GNUNET_free (cinfo); + return GNUNET_YES; +} + + +/** + * Callback used to notify a client owner of a tunnel that a peer has + * disconnected, most likely because of a path change. + * + * @param cls Closure (tunnel this notification is about). + * @param peer_id Short ID of disconnected peer. + */ +void +tunnel_notify_client_peer_disconnected (void *cls, GNUNET_PEER_Id peer_id) +{ + struct MeshTunnel *t = cls; + struct MeshPeerInfo *peer; + struct MeshPathInfo *path_info; + + client_notify_peer_disconnected (t->owner, t, peer_id); + + peer = peer_info_get_short (peer_id); + path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); + path_info->peer = peer; + path_info->t = t; + peer->connect_task = GNUNET_SCHEDULER_add_now (&peer_info_connect_task, + path_info); +} + + +/** + * Add a peer to a tunnel, accomodating paths accordingly and initializing all + * needed rescources. + * If peer already exists, reevaluate shortest path and change if different. + * + * @param t Tunnel we want to add a new peer to + * @param peer PeerInfo of the peer being added + * + */ +static void +tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer) +{ + struct GNUNET_PeerIdentity id; + struct MeshPeerPath *best_p; + struct MeshPeerPath *p; + unsigned int best_cost; + unsigned int cost; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tunnel_add_peer\n"); + GNUNET_PEER_resolve (peer->id, &id); + if (GNUNET_NO == + GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey)) + { + t->peers_total++; + GNUNET_array_append (peer->tunnels, peer->ntunnels, t); + GNUNET_assert (GNUNET_OK == + GNUNET_CONTAINER_multihashmap_put (t->peers, &id.hashPubKey, + peer, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); + } + + if (NULL != (p = peer->path_head)) + { + best_p = p; + best_cost = tree_get_path_cost (t->tree, p); + while (NULL != p) + { + if ((cost = tree_get_path_cost (t->tree, p)) < best_cost) + { + best_cost = cost; + best_p = p; + } + p = p->next; + } + tree_add_path (t->tree, best_p, &tunnel_notify_client_peer_disconnected, t); + if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task) + t->path_refresh_task = + GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t); + } + else + { + /* Start a DHT get */ + peer_info_connect (peer, t); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tunnel_add_peer END\n"); +} + +/** + * Add a path to a tunnel which we don't own, just to remember the next hop. + * If destination node was already in the tunnel, the first hop information + * will be replaced with the new path. + * + * @param t Tunnel we want to add a new peer to + * @param p Path to add + * @param own_pos Position of local node in path. + * + */ +static void +tunnel_add_path (struct MeshTunnel *t, struct MeshPeerPath *p, + unsigned int own_pos) +{ + struct GNUNET_PeerIdentity id; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tunnel_add_path\n"); + GNUNET_assert (0 != own_pos); + tree_add_path (t->tree, p, NULL, NULL); + if (own_pos < p->length - 1) + { + GNUNET_PEER_resolve (p->peers[own_pos + 1], &id); + tree_update_first_hops (t->tree, myid, &id); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "tunnel_add_path END\n"); +} + +/** + * Add a client to a tunnel, initializing all needed data structures. + * + * @param t Tunnel to which add the client. + * @param c Client which to add to the tunnel. + */ +static void +tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c) +{ + struct MeshTunnelClientInfo clinfo; + + GNUNET_array_append (t->clients, t->nclients, c); + clinfo.fwd_ack = t->fwd_pid + 1; + clinfo.bck_ack = t->nobuffer ? 1 : INITIAL_WINDOW_SIZE - 1; + clinfo.fwd_pid = t->fwd_pid; + clinfo.bck_pid = (uint32_t) -1; // Expected next: 0 + t->nclients--; + GNUNET_array_append (t->clients_fc, t->nclients, clinfo); +} + + +/** + * Notifies a tunnel that a connection has broken that affects at least + * some of its peers. Sends a notification towards the root of the tree. + * In case the peer is the owner of the tree, notifies the client that owns + * the tunnel and tries to reconnect. + * + * @param t Tunnel affected. + * @param p1 Peer that got disconnected from p2. + * @param p2 Peer that got disconnected from p1. + * + * @return Short ID of the peer disconnected (either p1 or p2). + * 0 if the tunnel remained unaffected. + */ +static GNUNET_PEER_Id +tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1, + GNUNET_PEER_Id p2) +{ + GNUNET_PEER_Id pid; + + pid = + tree_notify_connection_broken (t->tree, p1, p2, + &tunnel_notify_client_peer_disconnected, + t); + if (myid != p1 && myid != p2) + { + return pid; + } + if (pid != myid) + { + if (tree_get_predecessor (t->tree) != 0) + { + /* We are the peer still connected, notify owner of the disconnection. */ + struct GNUNET_MESH_PathBroken msg; + struct GNUNET_PeerIdentity neighbor; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN); + GNUNET_PEER_resolve (t->id.oid, &msg.oid); + msg.tid = htonl (t->id.tid); + msg.peer1 = my_full_id; + GNUNET_PEER_resolve (pid, &msg.peer2); + GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor); + send_prebuilt_message (&msg.header, &neighbor, t); + } + } + return pid; +} + + +/** + * Send a multicast packet to a neighbor. + * + * @param cls Closure (Info about the multicast packet) + * @param neighbor_id Short ID of the neighbor to send the packet to. + */ +static void +tunnel_send_multicast_iterator (void *cls, GNUNET_PEER_Id neighbor_id) +{ + struct MeshData *mdata = cls; + struct MeshTransmissionDescriptor *info; + struct GNUNET_PeerIdentity neighbor; + struct GNUNET_MessageHeader *msg; + + info = GNUNET_malloc (sizeof (struct MeshTransmissionDescriptor)); + + info->mesh_data = mdata; + (mdata->reference_counter) ++; + info->destination = neighbor_id; + GNUNET_PEER_resolve (neighbor_id, &neighbor); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending to %s...\n", + GNUNET_i2s (&neighbor)); + info->peer = peer_info_get (&neighbor); + GNUNET_assert (NULL != info->peer); + msg = (struct GNUNET_MessageHeader *) mdata->data; + queue_add(info, + ntohs (msg->type), + info->mesh_data->data_len, + info->peer, + mdata->t); +} + + +/** + * Queue a message in a tunnel in multicast, sending a copy to each child node + * down the local one in the tunnel tree. + * + * @param t Tunnel in which to send the data. + * @param msg Message to be sent. + */ +static void +tunnel_send_multicast (struct MeshTunnel *t, + const struct GNUNET_MessageHeader *msg) +{ + struct MeshData *mdata; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " sending a multicast packet...\n"); + + mdata = GNUNET_malloc (sizeof (struct MeshData)); + mdata->data_len = ntohs (msg->size); + mdata->t = t; + mdata->data = GNUNET_malloc (mdata->data_len); + memcpy (mdata->data, msg, mdata->data_len); + if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST) + { + struct GNUNET_MESH_Multicast *mcast; + + mcast = (struct GNUNET_MESH_Multicast *) mdata->data; + if (t->fwd_queue_n >= t->fwd_queue_max) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " queue full!\n"); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + " message from %s!\n", + GNUNET_i2s(&mcast->oid)); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + " message at %s!\n", + GNUNET_i2s(&my_full_id)); + GNUNET_free (mdata->data); + GNUNET_free (mdata); + return; + } + t->fwd_queue_n++; + mcast->ttl = htonl (ntohl (mcast->ttl) - 1); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " data packet, ttl: %u\n", + ntohl (mcast->ttl)); + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not a data packet, no ttl\n"); + } + + tree_iterate_children (t->tree, &tunnel_send_multicast_iterator, mdata); + if (mdata->reference_counter == 0) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " no one to send data to\n"); + GNUNET_free (mdata->data); + GNUNET_free (mdata); + if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST) + t->fwd_queue_n--; + } + else + { + mdata->total_out = mdata->reference_counter; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " sending a multicast packet done\n"); + return; +} + + +/** + * Increase the SKIP value of all peers that + * have not received a unicast message. + * + * @param cls Closure (ID of the peer that HAS received the message). + * @param key ID of the neighbor. + * @param value Information about the neighbor. + * + * @return GNUNET_YES to keep iterating. + */ +static int +tunnel_add_skip (void *cls, + const struct GNUNET_HashCode * key, + void *value) +{ + struct GNUNET_PeerIdentity *neighbor = cls; + struct MeshTunnelChildInfo *cinfo = value; + + /* TODO compare only pointers? key == neighbor? */ + if (0 == memcmp (&neighbor->hashPubKey, key, sizeof (struct GNUNET_HashCode))) + { + return GNUNET_YES; + } + cinfo->skip++; + return GNUNET_YES; +} + + +/** + * @brief Get neighbor's Flow Control information. + * + * Retrieves the MeshTunnelChildInfo containing Flow Control data about a direct + * descendant of the local node in a certain tunnel. + * If the info is not yet there (recently created path), creates the data struct + * and inserts it into the tunnel info, initialized to the current tunnel ACK + * values. + * + * @param t Tunnel related. + * @param peer Neighbor whose Flow Control info is needed. + * + * @return Neighbor's Flow Control info. + */ +static struct MeshTunnelChildInfo * +tunnel_get_neighbor_fc (struct MeshTunnel *t, + const struct GNUNET_PeerIdentity *peer) +{ + struct MeshTunnelChildInfo *cinfo; + + if (NULL == t->children_fc) + return NULL; + + cinfo = GNUNET_CONTAINER_multihashmap_get (t->children_fc, + &peer->hashPubKey); + if (NULL == cinfo) + { + uint32_t delta; + + cinfo = GNUNET_malloc (sizeof (struct MeshTunnelChildInfo)); + cinfo->id = GNUNET_PEER_intern (peer); + cinfo->skip = t->fwd_pid; + cinfo->t = t; + + delta = t->nobuffer ? 1 : INITIAL_WINDOW_SIZE; + cinfo->fwd_ack = t->fwd_pid + delta; + cinfo->bck_ack = delta; + cinfo->bck_pid = -1; + + cinfo->fc_poll = GNUNET_SCHEDULER_NO_TASK; + cinfo->fc_poll_time = GNUNET_TIME_UNIT_SECONDS; + + cinfo->send_buffer = + GNUNET_malloc (sizeof(struct MeshPeerQueue *) * t->fwd_queue_max); + + GNUNET_assert (GNUNET_OK == + GNUNET_CONTAINER_multihashmap_put (t->children_fc, + &peer->hashPubKey, + cinfo, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); + } + return cinfo; +} + + +/** + * Get the Flow Control info of a client. + * + * @param t Tunnel on which to look. + * @param c Client whose ACK to get. + * + * @return ACK value. + */ +static struct MeshTunnelClientInfo * +tunnel_get_client_fc (struct MeshTunnel *t, + struct MeshClient *c) +{ + unsigned int i; + + for (i = 0; i < t->nclients; i++) + { + if (t->clients[i] != c) + continue; + return &t->clients_fc[i]; + } + GNUNET_assert (0); + return NULL; // avoid compiler / coverity complaints +} + + +/** + * Iterator to get the appropiate ACK value from all children nodes. + * + * @param cls Closue (tunnel). + * @param id Id of the child node. + */ +static void +tunnel_get_child_fwd_ack (void *cls, + GNUNET_PEER_Id id) +{ + struct GNUNET_PeerIdentity peer_id; + struct MeshTunnelChildInfo *cinfo; + struct MeshTunnelChildIteratorContext *ctx = cls; + struct MeshTunnel *t = ctx->t; + uint32_t ack; + + GNUNET_PEER_resolve (id, &peer_id); + cinfo = tunnel_get_neighbor_fc (t, &peer_id); + ack = cinfo->fwd_ack; + + ctx->nchildren++; + if (GNUNET_NO == ctx->init) + { + ctx->max_child_ack = ack; + ctx->init = GNUNET_YES; + } + + if (GNUNET_YES == t->speed_min) + { + ctx->max_child_ack = ctx->max_child_ack > ack ? ack : ctx->max_child_ack; + } + else + { + ctx->max_child_ack = ctx->max_child_ack > ack ? ctx->max_child_ack : ack; + } + +} + + +/** + * Get the maximum PID allowed to transmit to any + * tunnel child of the local peer, depending on the tunnel + * buffering/speed settings. + * + * @param t Tunnel. + * + * @return Maximum PID allowed (uint32 MAX), -1LL if node has no children. + */ +static int64_t +tunnel_get_children_fwd_ack (struct MeshTunnel *t) +{ + struct MeshTunnelChildIteratorContext ctx; + ctx.t = t; + ctx.max_child_ack = 0; + ctx.nchildren = 0; + ctx.init = GNUNET_NO; + tree_iterate_children (t->tree, tunnel_get_child_fwd_ack, &ctx); + + if (0 == ctx.nchildren) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " tunnel has no children, no FWD ACK\n"); + return -1LL; + } + + if (GNUNET_YES == t->nobuffer && GMC_is_pid_bigger(ctx.max_child_ack, t->fwd_pid)) + ctx.max_child_ack = t->fwd_pid + 1; // Might overflow, it's ok. + + return (int64_t) ctx.max_child_ack; +} + + +/** + * Set the FWD ACK value of a client in a particular tunnel. + * + * @param t Tunnel affected. + * @param c Client whose ACK to set. + * @param ack ACK value. + */ +static void +tunnel_set_client_fwd_ack (struct MeshTunnel *t, + struct MeshClient *c, + uint32_t ack) +{ + unsigned int i; + + for (i = 0; i < t->nclients; i++) + { + if (t->clients[i] != c) + continue; + t->clients_fc[i].fwd_ack = ack; + return; + } + GNUNET_break (0); +} + + +/** + * Get the highest ACK value of all clients in a particular tunnel, + * according to the buffering/speed settings. + * + * @param t Tunnel on which to look. + * + * @return Corresponding ACK value (max uint32_t). + * If no clients are suscribed, -1LL. + */ +static int64_t +tunnel_get_clients_fwd_ack (struct MeshTunnel *t) +{ + unsigned int i; + int64_t ack; + + if (0 == t->nclients) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " tunnel has no clients, no FWD ACK\n"); + return -1LL; + } + + for (ack = -1LL, i = 0; i < t->nclients; i++) + { + if (-1LL == ack || + (GNUNET_YES == t->speed_min && + GNUNET_YES == GMC_is_pid_bigger (ack, t->clients_fc[i].fwd_ack)) || + (GNUNET_NO == t->speed_min && + GNUNET_YES == GMC_is_pid_bigger (t->clients_fc[i].fwd_ack, ack))) + { + ack = t->clients_fc[i].fwd_ack; + } + } + + if (GNUNET_YES == t->nobuffer && GMC_is_pid_bigger(ack, t->fwd_pid)) + ack = (uint32_t) t->fwd_pid + 1; // Might overflow, it's ok. + + return (uint32_t) ack; +} + + +/** + * Get the current fwd ack value for a tunnel, taking in account the tunnel + * mode and the status of all children nodes. + * + * @param t Tunnel. + * + * @return Maximum PID allowed. + */ +static uint32_t +tunnel_get_fwd_ack (struct MeshTunnel *t) +{ + uint32_t ack; + uint32_t count; + uint32_t buffer_free; + int64_t child_ack; + int64_t client_ack; + + count = t->fwd_pid - t->skip; + buffer_free = t->fwd_queue_max - t->fwd_queue_n; + child_ack = tunnel_get_children_fwd_ack (t); + client_ack = tunnel_get_clients_fwd_ack (t); + if (GNUNET_YES == t->nobuffer) + { + ack = count; + if (-1LL == child_ack) + child_ack = client_ack; + if (-1LL == child_ack) + { + GNUNET_break (0); + client_ack = child_ack = ack; + } + } + else + { + ack = count + buffer_free; // Overflow? OK! + } + if (-1LL == child_ack) + { + // Node has no children, child_ack AND core buffer are irrelevant. + if (-1LL == client_ack) // No children AND no clients? Not good! + { + GNUNET_STATISTICS_update (stats, "# mesh acks with no target", + 1, GNUNET_NO); + + } + return (uint32_t) client_ack; + } + if (-1LL == client_ack) + { + client_ack = ack; + } + if (GNUNET_YES == t->speed_min) + { + ack = GMC_min_pid ((uint32_t) child_ack, ack); + ack = GMC_min_pid ((uint32_t) client_ack, ack); + } + else + { + ack = GMC_max_pid ((uint32_t) child_ack, ack); + ack = GMC_max_pid ((uint32_t) client_ack, ack); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "c %u, bf %u, ch %lld, cl %lld, ACK: %u\n", + count, buffer_free, child_ack, client_ack, ack); + return ack; +} + + +/** + * Build a local ACK message and send it to a local client. + * + * @param t Tunnel on which to send the ACK. + * @param c Client to whom send the ACK. + * @param ack Value of the ACK. + */ +static void +send_local_ack (struct MeshTunnel *t, struct MeshClient *c, uint32_t ack) +{ + struct GNUNET_MESH_LocalAck msg; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK); + msg.tunnel_id = htonl (t->owner == c ? t->local_tid : t->local_tid_dest); + msg.max_pid = htonl (ack); + GNUNET_SERVER_notification_context_unicast(nc, + c->handle, + &msg.header, + GNUNET_NO); +} + +/** + * Build an ACK message and queue it to send to the given peer. + * + * @param t Tunnel on which to send the ACK. + * @param peer Peer to whom send the ACK. + * @param ack Value of the ACK. + */ +static void +send_ack (struct MeshTunnel *t, struct GNUNET_PeerIdentity *peer, uint32_t ack) +{ + struct GNUNET_MESH_ACK msg; + + GNUNET_PEER_resolve (t->id.oid, &msg.oid); + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK); + msg.pid = htonl (ack); + msg.tid = htonl (t->id.tid); + + send_prebuilt_message (&msg.header, peer, t); +} + + +/** + * Notify a the owner of a tunnel about how many more + * payload packages will we accept on a given tunnel. + * + * @param t Tunnel on which to send the ACK. + */ +static void +tunnel_send_client_fwd_ack (struct MeshTunnel *t) +{ + uint32_t ack; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Sending client FWD ACK on tunnel %X\n", + t->local_tid); + + ack = tunnel_get_fwd_ack (t); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ack); + if (t->last_fwd_ack == ack) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " same as last, not sending!\n"); + return; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending!\n"); + t->last_fwd_ack = ack; + send_local_ack (t, t->owner, ack); +} + + +/** + * Send an ACK informing the predecessor about the available buffer space. + * In case there is no predecessor, inform the owning client. + * If buffering is off, send only on behalf of children or self if endpoint. + * If buffering is on, send when sent to children and buffer space is free. + * Note that although the name is fwd_ack, the FWD mean forward *traffic*, + * the ACK itself goes "back" (towards root). + * + * @param t Tunnel on which to send the ACK. + * @param type Type of message that triggered the ACK transmission. + */ +static void +tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type) +{ + struct GNUNET_PeerIdentity id; + uint32_t ack; + + if (NULL != t->owner) + { + tunnel_send_client_fwd_ack (t); + return; + } + /* Is it after unicast / multicast retransmission? */ + switch (type) + { + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "ACK due to FWD DATA retransmission\n"); + if (GNUNET_YES == t->nobuffer) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n"); + return; + } + break; + case GNUNET_MESSAGE_TYPE_MESH_ACK: + case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK: + break; + case GNUNET_MESSAGE_TYPE_MESH_POLL: + t->force_ack = GNUNET_YES; + break; + default: + GNUNET_break (0); + } + + /* Check if we need to transmit the ACK */ + if (t->fwd_queue_max > t->fwd_queue_n * 4 && + GMC_is_pid_bigger(t->last_fwd_ack, t->fwd_pid) && + GNUNET_NO == t->force_ack) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n"); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " t->qmax: %u, t->qn: %u\n", + t->fwd_queue_max, t->fwd_queue_n); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " t->pid: %u, t->ack: %u\n", + t->fwd_pid, t->last_fwd_ack); + return; + } + + /* Ok, ACK might be necessary, what PID to ACK? */ + ack = tunnel_get_fwd_ack (t); + + /* If speed_min and not all children have ack'd, dont send yet */ + if (ack == t->last_fwd_ack && GNUNET_NO == t->force_ack) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not ready\n"); + return; + } + + t->last_fwd_ack = ack; + GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id); + send_ack (t, &id, ack); + debug_fwd_ack++; + t->force_ack = GNUNET_NO; +} + + +/** + * Iterator to send a child node a BCK ACK to allow him to send more + * to_origin data. + * + * @param cls Closure (tunnel). + * @param id Id of the child node. + */ +static void +tunnel_send_child_bck_ack (void *cls, + GNUNET_PEER_Id id) +{ + struct MeshTunnel *t = cls; + struct MeshTunnelChildInfo *cinfo; + struct GNUNET_PeerIdentity peer; + uint32_t ack; + + GNUNET_PEER_resolve (id, &peer); + cinfo = tunnel_get_neighbor_fc (t, &peer); + ack = cinfo->bck_pid + t->bck_queue_max - t->bck_queue_n; + + if (cinfo->bck_ack == ack && GNUNET_NO == t->force_ack) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Not sending ACK, not needed\n"); + return; + } + cinfo->bck_ack = ack; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Sending BCK ACK %u (last sent: %u)\n", + ack, cinfo->bck_ack); + send_ack (t, &peer, ack); +} + + +/** + * @brief Send BCK ACKs to clients to allow them more to_origin traffic + * + * Iterates over all clients and sends BCK ACKs to the ones that need it. + * + * FIXME fc: what happens if we have 2 clients but q_size is 1? + * - implement a size 1 buffer in each client_fc AND children_fc + * to hold at least 1 message per "child". + * problem: violates no buffer policy + * - ack 0 and make "children" poll for transmission slots + * problem: big overhead, extra latency even in low traffic + * settings + * + * @param t Tunnel on which to send the BCK ACKs. + */ +static void +tunnel_send_clients_bck_ack (struct MeshTunnel *t) +{ + unsigned int i; + unsigned int tunnel_delta; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Sending BCK ACK to clients\n"); + + tunnel_delta = t->bck_queue_max - t->bck_queue_n; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " tunnel delta: %u\n", tunnel_delta); + + /* Find client whom to allow to send to origin (with lowest buffer space) */ + for (i = 0; i < t->nclients; i++) + { + struct MeshTunnelClientInfo *clinfo; + unsigned int delta; + + clinfo = &t->clients_fc[i]; + delta = clinfo->bck_ack - clinfo->bck_pid; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client %u delta: %u\n", + t->clients[i]->id, delta); + + if ((GNUNET_NO == t->nobuffer && tunnel_delta > delta) || + (GNUNET_YES == t->nobuffer && 0 == delta)) + { + uint32_t ack; + + ack = clinfo->bck_pid; + ack += t->nobuffer ? 1 : tunnel_delta; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " sending ack to client %u: %u\n", + t->clients[i]->id, ack); + send_local_ack (t, t->clients[i], ack); + clinfo->bck_ack = ack; + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " not sending ack to client %u (td %u, d %u)\n", + t->clients[i]->id, tunnel_delta, delta); + } + } +} + + +/** + * Send an ACK informing the children nodes and destination clients about + * the available buffer space. + * If buffering is off, send only on behalf of root (can be self). + * If buffering is on, send when sent to predecessor and buffer space is free. + * Note that although the name is bck_ack, the BCK mean backwards *traffic*, + * the ACK itself goes "forward" (towards children/clients). + * + * @param t Tunnel on which to send the ACK. + * @param type Type of message that triggered the ACK transmission. + */ +static void +tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type) +{ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Sending BCK ACK on tunnel %u [%u] due to %s\n", + t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type)); + /* Is it after data to_origin retransmission? */ + switch (type) + { + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + if (GNUNET_YES == t->nobuffer) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Not sending ACK, nobuffer\n"); + return; + } + break; + case GNUNET_MESSAGE_TYPE_MESH_ACK: + case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK: + break; + case GNUNET_MESSAGE_TYPE_MESH_POLL: + t->force_ack = GNUNET_YES; + break; + default: + GNUNET_break (0); + } + + tunnel_send_clients_bck_ack (t); + tree_iterate_children (t->tree, &tunnel_send_child_bck_ack, t); + t->force_ack = GNUNET_NO; +} + + +/** + * @brief Re-initiate traffic to this peer if necessary. + * + * Check if there is traffic queued towards this peer + * and the core transmit handle is NULL (traffic was stalled). + * If so, call core tmt rdy. + * + * @param cls Closure (unused) + * @param peer_id Short ID of peer to which initiate traffic. + */ +static void +peer_unlock_queue(void *cls, GNUNET_PEER_Id peer_id) +{ + struct MeshPeerInfo *peer; + struct GNUNET_PeerIdentity id; + struct MeshPeerQueue *q; + size_t size; + + peer = peer_info_get_short(peer_id); + if (NULL != peer->core_transmit) + return; + + q = queue_get_next(peer); + if (NULL == q) + { + /* Might br multicast traffic already sent to this particular peer but + * not to other children in this tunnel. + * This way t->queue_n would be > 0 but the queue of this particular peer + * would be empty. + */ + return; + } + size = q->size; + GNUNET_PEER_resolve (peer->id, &id); + peer->core_transmit = + GNUNET_CORE_notify_transmit_ready(core_handle, + 0, + 0, + GNUNET_TIME_UNIT_FOREVER_REL, + &id, + size, + &queue_send, + peer); + return; +} + + +/** + * @brief Allow transmission of FWD traffic on this tunnel + * + * Check if there is traffic queued towards any children + * and the core transmit handle is NULL, and if so, call core tmt rdy. + * + * @param t Tunnel on which to unlock FWD traffic. + */ +static void +tunnel_unlock_fwd_queues (struct MeshTunnel *t) +{ + if (0 == t->fwd_queue_n) + return; + + tree_iterate_children (t->tree, &peer_unlock_queue, NULL); +} + + +/** + * @brief Allow transmission of BCK traffic on this tunnel + * + * Check if there is traffic queued towards the root of the tree + * and the core transmit handle is NULL, and if so, call core tmt rdy. + * + * @param t Tunnel on which to unlock BCK traffic. + */ +static void +tunnel_unlock_bck_queue (struct MeshTunnel *t) +{ + if (0 == t->bck_queue_n) + return; + + peer_unlock_queue(NULL, tree_get_predecessor(t->tree)); +} + + +/** + * Send a message to all peers in this tunnel that the tunnel is no longer + * valid. + * + * @param t The tunnel whose peers to notify. + * @param parent ID of the parent, in case the tree is already destroyed. + */ +static void +tunnel_send_destroy (struct MeshTunnel *t, GNUNET_PEER_Id parent) +{ + struct GNUNET_MESH_TunnelDestroy msg; + struct GNUNET_PeerIdentity id; + + msg.header.size = htons (sizeof (msg)); + msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY); + GNUNET_PEER_resolve (t->id.oid, &msg.oid); + msg.tid = htonl (t->id.tid); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " sending tunnel destroy for tunnel: %s [%X]\n", + GNUNET_i2s (&msg.oid), t->id.tid); + if (tree_count_children(t->tree) > 0) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending multicast to children\n"); + tunnel_send_multicast (t, &msg.header); + } + if (0 == parent) + parent = tree_get_predecessor (t->tree); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", parent); + if (0 == parent) + return; + + GNUNET_PEER_resolve (parent, &id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " sending back to %s\n", + GNUNET_i2s (&id)); + send_prebuilt_message (&msg.header, &id, t); +} + + +/** + * Cancel all transmissions towards a neighbor that belong to a certain tunnel. + * + * @param cls Closure (Tunnel which to cancel). + * @param neighbor_id Short ID of the neighbor to whom cancel the transmissions. + */ +static void +tunnel_cancel_queues (void *cls, GNUNET_PEER_Id neighbor_id) +{ + struct MeshTunnel *t = cls; + struct MeshPeerInfo *peer_info; + struct MeshPeerQueue *pq; + struct MeshPeerQueue *next; + + peer_info = peer_info_get_short (neighbor_id); + for (pq = peer_info->queue_head; NULL != pq; pq = next) + { + next = pq->next; + if (pq->tunnel == t) + { + if (GNUNET_MESSAGE_TYPE_MESH_MULTICAST == pq->type || + GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type || + GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type) + { + // Should have been removed on destroy children + GNUNET_break (0); + } + queue_destroy (pq, GNUNET_YES); + } + } + if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit) + { + GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit); + peer_info->core_transmit = NULL; + } +} + +/** + * Destroy the tunnel and free any allocated resources linked to it. + * + * @param t the tunnel to destroy + * + * @return GNUNET_OK on success + */ +static int +tunnel_destroy (struct MeshTunnel *t) +{ + struct MeshClient *c; + struct GNUNET_HashCode hash; + unsigned int i; + int r; + + if (NULL == t) + return GNUNET_OK; + + r = GNUNET_OK; + c = t->owner; +#if MESH_DEBUG + { + struct GNUNET_PeerIdentity id; + + GNUNET_PEER_resolve (t->id.oid, &id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n", + GNUNET_i2s (&id), t->id.tid); + if (NULL != c) + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + } +#endif + + GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); + if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t)) + { + GNUNET_break (0); + r = GNUNET_SYSERR; + } + + if (NULL != c) + { + GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash); + if (GNUNET_YES != + GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels, &hash, t)) + { + GNUNET_break (0); + r = GNUNET_SYSERR; + } + } + + GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); + for (i = 0; i < t->nclients; i++) + { + c = t->clients[i]; + if (GNUNET_YES != + GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, &hash, t)) + { + GNUNET_break (0); + r = GNUNET_SYSERR; + } + } + for (i = 0; i < t->nignore; i++) + { + c = t->ignore[i]; + if (GNUNET_YES != + GNUNET_CONTAINER_multihashmap_remove (c->ignore_tunnels, &hash, t)) + { + GNUNET_break (0); + r = GNUNET_SYSERR; + } + } + + (void) GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash, t); + GNUNET_free_non_null (t->clients); + GNUNET_free_non_null (t->ignore); + GNUNET_free_non_null (t->clients_fc); + + if (NULL != t->peers) + { + GNUNET_CONTAINER_multihashmap_iterate (t->peers, &peer_info_delete_tunnel, + t); + GNUNET_CONTAINER_multihashmap_destroy (t->peers); + } + + GNUNET_CONTAINER_multihashmap_iterate (t->children_fc, + &tunnel_destroy_child, + t); + GNUNET_CONTAINER_multihashmap_destroy (t->children_fc); + t->children_fc = NULL; + + tree_iterate_children (t->tree, &tunnel_cancel_queues, t); + tree_destroy (t->tree); + + if (NULL != t->regex_search) + GNUNET_REGEX_search_cancel (t->regex_search->search_handle); + if (NULL != t->dht_get_type) + GNUNET_DHT_get_stop (t->dht_get_type); + if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task) + GNUNET_SCHEDULER_cancel (t->timeout_task); + if (GNUNET_SCHEDULER_NO_TASK != t->path_refresh_task) + GNUNET_SCHEDULER_cancel (t->path_refresh_task); + + n_tunnels--; + GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO); + GNUNET_free (t); + return r; +} + +#define TUNNEL_DESTROY_EMPTY_TIME GNUNET_TIME_UNIT_MILLISECONDS + +/** + * Tunnel is empty: destroy it. + * + * @param cls Closure (Tunnel). + * @param tc TaskContext. + */ +static void +tunnel_destroy_empty_delayed (void *cls, + const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshTunnel *t = cls; + + t->delayed_destroy = GNUNET_SCHEDULER_NO_TASK; + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + return; + + if (0 != t->nclients || + 0 != tree_count_children (t->tree)) + return; + + #if MESH_DEBUG + { + struct GNUNET_PeerIdentity id; + + GNUNET_PEER_resolve (t->id.oid, &id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "executing destruction of empty tunnel %s [%X]\n", + GNUNET_i2s (&id), t->id.tid); + } + #endif + + tunnel_send_destroy (t, 0); + if (0 == t->pending_messages) + tunnel_destroy (t); + else + t->destroy = GNUNET_YES; +} + + +/** + * Schedule tunnel destruction if is empty and no new traffic comes in a time. + * + * @param t Tunnel to destroy if empty. + */ +static void +tunnel_destroy_empty (struct MeshTunnel *t) +{ + if (GNUNET_SCHEDULER_NO_TASK != t->delayed_destroy || + 0 != t->nclients || + 0 != tree_count_children (t->tree)) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "%u %u %u\n", + t->delayed_destroy, t->nclients, tree_count_children(t->tree)); + return; + } + + #if MESH_DEBUG + { + struct GNUNET_PeerIdentity id; + + GNUNET_PEER_resolve (t->id.oid, &id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "scheduling destruction of empty tunnel %s [%X]\n", + GNUNET_i2s (&id), t->id.tid); + } + #endif + + t->delayed_destroy = + GNUNET_SCHEDULER_add_delayed (TUNNEL_DESTROY_EMPTY_TIME, + &tunnel_destroy_empty_delayed, + t); +} + + +/** + * Create a new tunnel + * + * @param owner Who is the owner of the tunnel (short ID). + * @param tid Tunnel Number of the tunnel. + * @param client Clients that owns the tunnel, NULL for foreign tunnels. + * @param local Tunnel Number for the tunnel, for the client point of view. + * + * @return A new initialized tunnel. NULL on error. + */ +static struct MeshTunnel * +tunnel_new (GNUNET_PEER_Id owner, + MESH_TunnelNumber tid, + struct MeshClient *client, + MESH_TunnelNumber local) +{ + struct MeshTunnel *t; + struct GNUNET_HashCode hash; + + if (n_tunnels >= max_tunnels && NULL == client) + return NULL; + + t = GNUNET_malloc (sizeof (struct MeshTunnel)); + t->id.oid = owner; + t->id.tid = tid; + t->fwd_queue_max = (max_msgs_queue / max_tunnels) + 1; + t->bck_queue_max = t->fwd_queue_max; + t->tree = tree_new (owner); + t->owner = client; + t->fwd_pid = (uint32_t) -1; // Next (expected) = 0 + t->bck_pid = (uint32_t) -1; // Next (expected) = 0 + t->bck_ack = INITIAL_WINDOW_SIZE - 1; + t->last_fwd_ack = INITIAL_WINDOW_SIZE - 1; + t->local_tid = local; + t->children_fc = GNUNET_CONTAINER_multihashmap_create (8, GNUNET_NO); + n_tunnels++; + GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO); + + GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) + { + GNUNET_break (0); + tunnel_destroy (t); + if (NULL != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR); + } + return NULL; + } + + if (NULL != client) + { + GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put (client->own_tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) + { + tunnel_destroy (t); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR); + return NULL; + } + } + + return t; +} + +/** + * Callback when removing children from a tunnel tree. Notify owner. + * + * @param cls Closure (tunnel). + * @param peer_id Short ID of the peer deleted. + */ +void +tunnel_child_removed (void *cls, GNUNET_PEER_Id peer_id) +{ + struct MeshTunnel *t = cls; + + client_notify_peer_disconnected (t->owner, t, peer_id); +} + +/** + * Removes an explicit path from a tunnel, freeing all intermediate nodes + * that are no longer needed, as well as nodes of no longer reachable peers. + * The tunnel itself is also destoyed if results in a remote empty tunnel. + * + * @param t Tunnel from which to remove the path. + * @param peer Short id of the peer which should be removed. + */ +static void +tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer) +{ + int r; + + r = tree_del_peer (t->tree, peer, &tunnel_child_removed, t); + if (GNUNET_NO == r) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Tunnel %u [%u] has no more nodes\n", + t->id.oid, t->id.tid); + } +} + + +/** + * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a + * client when the client disconnects. If the client is not the owner, the + * owner will get notified if no more clients are in the tunnel and the client + * get removed from the tunnel's list. + * + * @param cls closure (client that is disconnecting) + * @param key the hash of the local tunnel id (used to access the hashmap) + * @param value the value stored at the key (tunnel to destroy) + * + * @return GNUNET_OK, keep iterating. + */ +static int +tunnel_destroy_iterator (void *cls, + const struct GNUNET_HashCode * key, + void *value) +{ + struct MeshTunnel *t = value; + struct MeshClient *c = cls; + + send_client_tunnel_disconnect (t, c); + if (c != t->owner) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %u is destination.\n", c->id); + tunnel_delete_client (t, c); + client_delete_tunnel (c, t); + tunnel_destroy_empty (t); + return GNUNET_OK; + } + tunnel_send_destroy (t, 0); + t->owner = NULL; + t->destroy = GNUNET_YES; + + return GNUNET_OK; +} + + +/** + * Timeout function, destroys tunnel if called + * + * @param cls Closure (tunnel to destroy). + * @param tc TaskContext + */ +static void +tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshTunnel *t = cls; + struct GNUNET_PeerIdentity id; + + t->timeout_task = GNUNET_SCHEDULER_NO_TASK; + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + return; + GNUNET_PEER_resolve(t->id.oid, &id); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Tunnel %s [%X] timed out. Destroying.\n", + GNUNET_i2s(&id), t->id.tid); + send_clients_tunnel_destroy (t); + tunnel_destroy (t); +} + +/** + * Resets the tunnel timeout. Starts it if no timeout was running. + * + * @param t Tunnel whose timeout to reset. + * + * TODO use heap to improve efficiency of scheduler. + */ +static void +tunnel_reset_timeout (struct MeshTunnel *t) +{ + if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task) + GNUNET_SCHEDULER_cancel (t->timeout_task); + t->timeout_task = + GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply + (refresh_path_time, 4), &tunnel_timeout, t); +} + + +/******************************************************************************/ +/**************** MESH NETWORK HANDLER HELPERS ***********************/ +/******************************************************************************/ + +/** + * Function to send a create path packet to a peer. + * + * @param cls closure + * @param size number of bytes available in buf + * @param buf where the callee should write the message + * @return number of bytes written to buf + */ +static size_t +send_core_path_create (void *cls, size_t size, void *buf) +{ + struct MeshPathInfo *info = cls; + struct GNUNET_MESH_ManipulatePath *msg; + struct GNUNET_PeerIdentity *peer_ptr; + struct MeshTunnel *t = info->t; + struct MeshPeerPath *p = info->path; + size_t size_needed; + uint32_t opt; + int i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n"); + size_needed = + sizeof (struct GNUNET_MESH_ManipulatePath) + + p->length * sizeof (struct GNUNET_PeerIdentity); + + if (size < size_needed || NULL == buf) + { + GNUNET_break (0); + return 0; + } + msg = (struct GNUNET_MESH_ManipulatePath *) buf; + msg->header.size = htons (size_needed); + msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE); + msg->tid = ntohl (t->id.tid); + + opt = 0; + if (GNUNET_YES == t->speed_min) + opt |= MESH_TUNNEL_OPT_SPEED_MIN; + if (GNUNET_YES == t->nobuffer) + opt |= MESH_TUNNEL_OPT_NOBUFFER; + msg->opt = htonl(opt); + msg->reserved = 0; + + peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1]; + for (i = 0; i < p->length; i++) + { + GNUNET_PEER_resolve (p->peers[i], peer_ptr++); + } + + path_destroy (p); + GNUNET_free (info); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "CREATE PATH (%u bytes long) sent!\n", size_needed); + return size_needed; +} + + +/** + * Fill the core buffer + * + * @param cls closure (data itself) + * @param size number of bytes available in buf + * @param buf where the callee should write the message + * + * @return number of bytes written to buf + */ +static size_t +send_core_data_multicast (void *cls, size_t size, void *buf) +{ + struct MeshTransmissionDescriptor *info = cls; + size_t total_size; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Multicast callback.\n"); + GNUNET_assert (NULL != info); + GNUNET_assert (NULL != info->peer); + total_size = info->mesh_data->data_len; + GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE); + + if (total_size > size) + { + GNUNET_break (0); + return 0; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " copying data...\n"); + memcpy (buf, info->mesh_data->data, total_size); +#if MESH_DEBUG + { + struct GNUNET_MESH_Multicast *mc; + struct GNUNET_MessageHeader *mh; + + mh = buf; + if (ntohs (mh->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST) + { + mc = (struct GNUNET_MESH_Multicast *) mh; + mh = (struct GNUNET_MessageHeader *) &mc[1]; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " multicast, payload type %s\n", + GNUNET_MESH_DEBUG_M2S (ntohs (mh->type))); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " multicast, payload size %u\n", ntohs (mh->size)); + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type %s\n", + GNUNET_MESH_DEBUG_M2S (ntohs (mh->type))); + } + } +#endif + data_descriptor_decrement_rc (info->mesh_data); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "freeing info...\n"); + GNUNET_free (info); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "return %u\n", total_size); + return total_size; +} + + +/** + * Creates a path ack message in buf and frees all unused resources. + * + * @param cls closure (MeshTransmissionDescriptor) + * @param size number of bytes available in buf + * @param buf where the callee should write the message + * @return number of bytes written to buf + */ +static size_t +send_core_path_ack (void *cls, size_t size, void *buf) +{ + struct MeshTransmissionDescriptor *info = cls; + struct GNUNET_MESH_PathACK *msg = buf; + + GNUNET_assert (NULL != info); + if (sizeof (struct GNUNET_MESH_PathACK) > size) + { + GNUNET_break (0); + return 0; + } + msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK)); + msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK); + GNUNET_PEER_resolve (info->origin->oid, &msg->oid); + msg->tid = htonl (info->origin->tid); + msg->peer_id = my_full_id; + + GNUNET_free (info); + /* TODO add signature */ + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n"); + return sizeof (struct GNUNET_MESH_PathACK); +} + + +/** + * Free a transmission that was already queued with all resources + * associated to the request. + * + * @param queue Queue handler to cancel. + * @param clear_cls Is it necessary to free associated cls? + */ +static void +queue_destroy (struct MeshPeerQueue *queue, int clear_cls) +{ + struct MeshTransmissionDescriptor *dd; + struct MeshPathInfo *path_info; + struct MeshTunnelChildInfo *cinfo; + struct GNUNET_PeerIdentity id; + unsigned int i; + unsigned int max; + + if (GNUNET_YES == clear_cls) + { + switch (queue->type) + { + case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY: + GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n"); + GNUNET_break (GNUNET_YES == queue->tunnel->destroy); + /* fall through */ + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + case GNUNET_MESSAGE_TYPE_MESH_ACK: + case GNUNET_MESSAGE_TYPE_MESH_POLL: + case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " prebuilt message\n"); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " type %s\n", + GNUNET_MESH_DEBUG_M2S(queue->type)); + dd = queue->cls; + data_descriptor_decrement_rc (dd->mesh_data); + break; + case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n"); + path_info = queue->cls; + path_destroy (path_info->path); + break; + default: + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + " type %s unknown!\n", + GNUNET_MESH_DEBUG_M2S(queue->type)); + } + GNUNET_free_non_null (queue->cls); + } + GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head, + queue->peer->queue_tail, + queue); + + /* Delete from child_fc in the appropiate tunnel */ + max = queue->tunnel->fwd_queue_max; + GNUNET_PEER_resolve (queue->peer->id, &id); + cinfo = tunnel_get_neighbor_fc (queue->tunnel, &id); + if (NULL != cinfo) + { + for (i = 0; i < cinfo->send_buffer_n; i++) + { + unsigned int i2; + i2 = (cinfo->send_buffer_start + i) % max; + if (cinfo->send_buffer[i2] == queue) + { + /* Found corresponding entry in the send_buffer. Move all others back. */ + unsigned int j; + unsigned int j2; + unsigned int j3; + + for (j = i, j2 = 0, j3 = 0; j < cinfo->send_buffer_n - 1; j++) + { + j2 = (cinfo->send_buffer_start + j) % max; + j3 = (cinfo->send_buffer_start + j + 1) % max; + cinfo->send_buffer[j2] = cinfo->send_buffer[j3]; + } + + cinfo->send_buffer[j3] = NULL; + cinfo->send_buffer_n--; + } + } + } + + GNUNET_free (queue); +} + + +/** + * @brief Get the next transmittable message from the queue. + * + * This will be the head, except in the case of being a data packet + * not allowed by the destination peer. + * + * @param peer Destination peer. + * + * @return The next viable MeshPeerQueue element to send to that peer. + * NULL when there are no transmittable messages. + */ +struct MeshPeerQueue * +queue_get_next (const struct MeshPeerInfo *peer) +{ + struct MeshPeerQueue *q; + struct MeshTunnel *t; + struct MeshTransmissionDescriptor *info; + struct MeshTunnelChildInfo *cinfo; + struct GNUNET_MESH_Unicast *ucast; + struct GNUNET_MESH_ToOrigin *to_orig; + struct GNUNET_MESH_Multicast *mcast; + struct GNUNET_PeerIdentity id; + uint32_t pid; + uint32_t ack; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* selecting message\n"); + for (q = peer->queue_head; NULL != q; q = q->next) + { + t = q->tunnel; + info = q->cls; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* %s\n", + GNUNET_MESH_DEBUG_M2S(q->type)); + switch (q->type) + { + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + ucast = (struct GNUNET_MESH_Unicast *) info->mesh_data->data; + pid = ntohl (ucast->pid); + GNUNET_PEER_resolve (info->peer->id, &id); + cinfo = tunnel_get_neighbor_fc(t, &id); + ack = cinfo->fwd_ack; + break; + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + to_orig = (struct GNUNET_MESH_ToOrigin *) info->mesh_data->data; + pid = ntohl (to_orig->pid); + ack = t->bck_ack; + break; + case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: + mcast = (struct GNUNET_MESH_Multicast *) info->mesh_data->data; + if (GNUNET_MESSAGE_TYPE_MESH_MULTICAST != ntohs(mcast->header.type)) + { + // Not a multicast payload: multicast control traffic (destroy, etc) + return q; + } + pid = ntohl (mcast->pid); + GNUNET_PEER_resolve (info->peer->id, &id); + cinfo = tunnel_get_neighbor_fc(t, &id); + ack = cinfo->fwd_ack; + break; + default: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* OK!\n"); + return q; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* ACK: %u, PID: %u\n", + ack, pid); + if (GNUNET_NO == GMC_is_pid_bigger(pid, ack)) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* OK!\n"); + return q; + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* NEXT!\n"); + } + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* nothing found\n"); + return NULL; +} + + +/** + * Core callback to write a queued packet to core buffer + * + * @param cls Closure (peer info). + * @param size Number of bytes available in buf. + * @param buf Where the to write the message. + * + * @return number of bytes written to buf + */ +static size_t +queue_send (void *cls, size_t size, void *buf) +{ + struct MeshPeerInfo *peer = cls; + struct GNUNET_MessageHeader *msg; + struct MeshPeerQueue *queue; + struct MeshTunnel *t; + struct MeshTunnelChildInfo *cinfo; + struct GNUNET_PeerIdentity dst_id; + size_t data_size; + + peer->core_transmit = NULL; + cinfo = NULL; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* Queue send\n"); + queue = queue_get_next (peer); + + /* Queue has no internal mesh traffic nor sendable payload */ + if (NULL == queue) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* not ready, return\n"); + if (NULL == peer->queue_head) + GNUNET_break (0); // Should've been canceled + return 0; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* not empty\n"); + + GNUNET_PEER_resolve (peer->id, &dst_id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* towards %s\n", + GNUNET_i2s(&dst_id)); + /* Check if buffer size is enough for the message */ + if (queue->size > size) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* not enough room, reissue\n"); + peer->core_transmit = + GNUNET_CORE_notify_transmit_ready (core_handle, + 0, + 0, + GNUNET_TIME_UNIT_FOREVER_REL, + &dst_id, + queue->size, + &queue_send, + peer); + return 0; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* size ok\n"); + + t = queue->tunnel; + GNUNET_assert (0 < t->pending_messages); + t->pending_messages--; + if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type) + { + t->fwd_queue_n--; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* unicast: t->q (%u/%u)\n", + t->fwd_queue_n, t->fwd_queue_max); + } + else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type) + { + t->bck_queue_n--; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* to origin\n"); + } + + /* Fill buf */ + switch (queue->type) + { + case 0: + case GNUNET_MESSAGE_TYPE_MESH_ACK: + case GNUNET_MESSAGE_TYPE_MESH_POLL: + case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN: + case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY: + case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* raw: %s\n", + GNUNET_MESH_DEBUG_M2S (queue->type)); + /* Fall through */ + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + data_size = send_core_data_raw (queue->cls, size, buf); + msg = (struct GNUNET_MessageHeader *) buf; + switch (ntohs (msg->type)) // Type of preconstructed message + { + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST); + break; + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN); + break; + default: + break; + } + break; + case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* multicast\n"); + { + struct MeshTransmissionDescriptor *info = queue->cls; + + if ((1 == info->mesh_data->reference_counter + && GNUNET_YES == t->speed_min) + || + (info->mesh_data->total_out == info->mesh_data->reference_counter + && GNUNET_NO == t->speed_min)) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* considered sent\n"); + t->fwd_queue_n--; + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "********* NOT considered sent yet\n"); + t->pending_messages++; + } + } + data_size = send_core_data_multicast(queue->cls, size, buf); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_MULTICAST); + break; + case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* path create\n"); + data_size = send_core_path_create (queue->cls, size, buf); + break; + case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* path ack\n"); + data_size = send_core_path_ack (queue->cls, size, buf); + break; + case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE: + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* path keepalive\n"); + data_size = send_core_data_multicast (queue->cls, size, buf); + break; + default: + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "********* type unknown: %u\n", + queue->type); + data_size = 0; + } + switch (queue->type) + { + case GNUNET_MESSAGE_TYPE_MESH_UNICAST: + case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: + case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: + cinfo = tunnel_get_neighbor_fc (t, &dst_id); + if (cinfo->send_buffer[cinfo->send_buffer_start] != queue) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "at pos %u (%p) != %p\n", + cinfo->send_buffer_start, + cinfo->send_buffer[cinfo->send_buffer_start], + queue); + } + if (cinfo->send_buffer_n > 0) + { + cinfo->send_buffer[cinfo->send_buffer_start] = NULL; + cinfo->send_buffer_n--; + cinfo->send_buffer_start++; + cinfo->send_buffer_start %= t->fwd_queue_max; + } + else + { + GNUNET_break (0); + } + break; + default: + break; + } + + /* Free queue, but cls was freed by send_core_* */ + queue_destroy (queue, GNUNET_NO); + + if (GNUNET_YES == t->destroy && 0 == t->pending_messages) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* destroying tunnel!\n"); + tunnel_destroy (t); + } + + /* If more data in queue, send next */ + queue = queue_get_next(peer); + if (NULL != queue) + { + struct GNUNET_PeerIdentity id; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* more data!\n"); + GNUNET_PEER_resolve (peer->id, &id); + peer->core_transmit = + GNUNET_CORE_notify_transmit_ready(core_handle, + 0, + 0, + GNUNET_TIME_UNIT_FOREVER_REL, + &id, + queue->size, + &queue_send, + peer); + } + else + { + if (NULL != peer->queue_head) + { + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "********* %s stalled\n", + GNUNET_i2s(&my_full_id)); + if (NULL == cinfo) + cinfo = tunnel_get_neighbor_fc (t, &dst_id); + // FIXME unify bck/fwd structures, bck does not have cinfo right now + if (NULL != cinfo && GNUNET_SCHEDULER_NO_TASK == cinfo->fc_poll) + { + cinfo->fc_poll = GNUNET_SCHEDULER_add_delayed (cinfo->fc_poll_time, + &tunnel_poll, cinfo); + } + } + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "********* return %d\n", data_size); + return data_size; +} + + +/** + * @brief Queue and pass message to core when possible. + * + * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status + * and accounts for it. In case the queue is full, the message is dropped and + * a break issued. + * + * Otherwise, message is treated as internal and allowed to go regardless of + * queue status. + * + * @param cls Closure (@c type dependant). It will be used by queue_send to + * build the message to be sent if not already prebuilt. + * @param type Type of the message, 0 for a raw message. + * @param size Size of the message. + * @param dst Neighbor to send message to. + * @param t Tunnel this message belongs to. + */ +static void +queue_add (void *cls, uint16_t type, size_t size, + struct MeshPeerInfo *dst, struct MeshTunnel *t) +{ + struct MeshPeerQueue *queue; + struct MeshTunnelChildInfo *cinfo; + struct GNUNET_PeerIdentity id; + unsigned int *max; + unsigned int *n; + unsigned int i; + + n = NULL; + if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type || + GNUNET_MESSAGE_TYPE_MESH_MULTICAST == type) + { + n = &t->fwd_queue_n; + max = &t->fwd_queue_max; + } + else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type) + { + n = &t->bck_queue_n; + max = &t->bck_queue_max; + } + if (NULL != n) + { + if (*n >= *max) + { + GNUNET_break(0); + GNUNET_STATISTICS_update(stats, + "# messages dropped (buffer full)", + 1, GNUNET_NO); + return; // Drop message + } + (*n)++; + } + queue = GNUNET_malloc (sizeof (struct MeshPeerQueue)); + queue->cls = cls; + queue->type = type; + queue->size = size; + queue->peer = dst; + queue->tunnel = t; + GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue); + GNUNET_PEER_resolve (dst->id, &id); + if (NULL == dst->core_transmit) + { + dst->core_transmit = + GNUNET_CORE_notify_transmit_ready (core_handle, + 0, + 0, + GNUNET_TIME_UNIT_FOREVER_REL, + &id, + size, + &queue_send, + dst); + } + t->pending_messages++; + if (NULL == n) // Is this internal mesh traffic? + return; + + // It's payload, keep track of buffer per peer. + cinfo = tunnel_get_neighbor_fc(t, &id); + i = (cinfo->send_buffer_start + cinfo->send_buffer_n) % t->fwd_queue_max; + if (NULL != cinfo->send_buffer[i]) + { + GNUNET_break (cinfo->send_buffer_n == t->fwd_queue_max); // aka i == start + queue_destroy (cinfo->send_buffer[cinfo->send_buffer_start], GNUNET_YES); + cinfo->send_buffer_start++; + cinfo->send_buffer_start %= t->fwd_queue_max; + } + else + { + cinfo->send_buffer_n++; + } + cinfo->send_buffer[i] = queue; + if (cinfo->send_buffer_n > t->fwd_queue_max) + { + GNUNET_break (0); + cinfo->send_buffer_n = t->fwd_queue_max; + } +} + + +/******************************************************************************/ +/******************** MESH NETWORK HANDLERS **************************/ +/******************************************************************************/ + + +/** + * Core handler for path creation + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + unsigned int own_pos; + uint16_t size; + uint16_t i; + MESH_TunnelNumber tid; + struct GNUNET_MESH_ManipulatePath *msg; + struct GNUNET_PeerIdentity *pi; + struct GNUNET_HashCode hash; + struct MeshPeerPath *path; + struct MeshPeerInfo *dest_peer_info; + struct MeshPeerInfo *orig_peer_info; + struct MeshTunnel *t; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Received a path create msg [%s]\n", + GNUNET_i2s (&my_full_id)); + size = ntohs (message->size); + if (size < sizeof (struct GNUNET_MESH_ManipulatePath)) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + + size -= sizeof (struct GNUNET_MESH_ManipulatePath); + if (size % sizeof (struct GNUNET_PeerIdentity)) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + size /= sizeof (struct GNUNET_PeerIdentity); + if (size < 2) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size); + msg = (struct GNUNET_MESH_ManipulatePath *) message; + + tid = ntohl (msg->tid); + pi = (struct GNUNET_PeerIdentity *) &msg[1]; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " path is for tunnel %s [%X].\n", GNUNET_i2s (pi), tid); + t = tunnel_get (pi, tid); + if (NULL == t) // FIXME only for INCOMING tunnels? + { + uint32_t opt; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n"); + t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0); + if (NULL == t) + { + // FIXME notify failure + return GNUNET_OK; + } + opt = ntohl (msg->opt); + t->speed_min = (0 != (opt & MESH_TUNNEL_OPT_SPEED_MIN)) ? + GNUNET_YES : GNUNET_NO; + if (0 != (opt & MESH_TUNNEL_OPT_NOBUFFER)) + { + t->nobuffer = GNUNET_YES; + t->last_fwd_ack = t->fwd_pid + 1; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " speed_min: %d, nobuffer:%d\n", + t->speed_min, t->nobuffer); + + if (GNUNET_YES == t->nobuffer) + { + t->bck_queue_max = 1; + t->fwd_queue_max = 1; + } + + // FIXME only assign a local tid if a local client is interested (on demand) + while (NULL != tunnel_get_incoming (next_local_tid)) + next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; + t->local_tid_dest = next_local_tid++; + next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; + // FIXME end + + tunnel_reset_timeout (t); + GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); + if (GNUNET_OK != + GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) + { + tunnel_destroy (t); + GNUNET_break (0); + return GNUNET_OK; + } + } + dest_peer_info = + GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey); + if (NULL == dest_peer_info) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Creating PeerInfo for destination.\n"); + dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo)); + dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]); + GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey, + dest_peer_info, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); + } + orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey); + if (NULL == orig_peer_info) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Creating PeerInfo for origin.\n"); + orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo)); + orig_peer_info->id = GNUNET_PEER_intern (pi); + GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n"); + path = path_new (size); + own_pos = 0; + for (i = 0; i < size; i++) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n", + GNUNET_i2s (&pi[i])); + path->peers[i] = GNUNET_PEER_intern (&pi[i]); + if (path->peers[i] == myid) + own_pos = i; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos); + if (own_pos == 0) + { + /* cannot be self, must be 'not found' */ + /* create path: self not found in path through self */ + GNUNET_break_op (0); + path_destroy (path); + tunnel_destroy (t); + return GNUNET_OK; + } + path_add_to_peers (path, GNUNET_NO); + tunnel_add_path (t, path, own_pos); + if (own_pos == size - 1) + { + /* It is for us! Send ack. */ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); + peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO); + if (NULL == t->peers) + { + /* New tunnel! Notify clients on first payload message. */ + t->peers = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO); + } + GNUNET_break (GNUNET_SYSERR != + GNUNET_CONTAINER_multihashmap_put (t->peers, + &my_full_id.hashPubKey, + peer_info_get + (&my_full_id), + GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE)); + send_path_ack (t); + } + else + { + struct MeshPeerPath *path2; + + /* It's for somebody else! Retransmit. */ + path2 = path_duplicate (path); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n"); + peer_info_add_path (dest_peer_info, path2, GNUNET_NO); + path2 = path_duplicate (path); + peer_info_add_path_to_origin (orig_peer_info, path2, GNUNET_NO); + send_create_path (dest_peer_info, path, t); + } + return GNUNET_OK; +} + + +/** + * Core handler for path destruction + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_path_destroy (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_ManipulatePath *msg; + struct GNUNET_PeerIdentity *pi; + struct MeshPeerPath *path; + struct MeshTunnel *t; + unsigned int own_pos; + unsigned int i; + size_t size; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Received a PATH DESTROY msg from %s\n", GNUNET_i2s (peer)); + size = ntohs (message->size); + if (size < sizeof (struct GNUNET_MESH_ManipulatePath)) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + + size -= sizeof (struct GNUNET_MESH_ManipulatePath); + if (size % sizeof (struct GNUNET_PeerIdentity)) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + size /= sizeof (struct GNUNET_PeerIdentity); + if (size < 2) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size); + + msg = (struct GNUNET_MESH_ManipulatePath *) message; + pi = (struct GNUNET_PeerIdentity *) &msg[1]; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " path is for tunnel %s [%X].\n", GNUNET_i2s (pi), + msg->tid); + t = tunnel_get (pi, ntohl (msg->tid)); + if (NULL == t) + { + /* TODO notify back: we don't know this tunnel */ + GNUNET_break_op (0); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n"); + path = path_new (size); + own_pos = 0; + for (i = 0; i < size; i++) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n", + GNUNET_i2s (&pi[i])); + path->peers[i] = GNUNET_PEER_intern (&pi[i]); + if (path->peers[i] == myid) + own_pos = i; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos); + if (own_pos < path->length - 1) + send_prebuilt_message (message, &pi[own_pos + 1], t); + else + send_client_tunnel_disconnect(t, NULL); + + tunnel_delete_peer (t, path->peers[path->length - 1]); + path_destroy (path); + return GNUNET_OK; +} + + +/** + * Core handler for notifications of broken paths + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_PathBroken *msg; + struct MeshTunnel *t; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer)); + msg = (struct GNUNET_MESH_PathBroken *) message; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", + GNUNET_i2s (&msg->peer1)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", + GNUNET_i2s (&msg->peer2)); + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + if (NULL == t) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1), + GNUNET_PEER_search (&msg->peer2)); + return GNUNET_OK; + +} + + +/** + * Core handler for tunnel destruction + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_TunnelDestroy *msg; + struct MeshTunnel *t; + GNUNET_PEER_Id parent; + GNUNET_PEER_Id pid; + + msg = (struct GNUNET_MESH_TunnelDestroy *) message; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a TUNNEL DESTROY packet from %s\n", + GNUNET_i2s (peer)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " for tunnel %s [%u]\n", + GNUNET_i2s (&msg->oid), ntohl (msg->tid)); + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + /* Check signature */ + if (NULL == t) + { + /* Probably already got the message from another path, + * destroyed the tunnel and retransmitted to children. + * Safe to ignore. + */ + GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", + 1, GNUNET_NO); + return GNUNET_OK; + } + parent = tree_get_predecessor (t->tree); + pid = GNUNET_PEER_search (peer); + if (pid != parent) + { + unsigned int nc; + + tree_del_peer (t->tree, pid, &tunnel_child_removed, t); + nc = tree_count_children (t->tree); + if (nc > 0 || NULL != t->owner || t->nclients > 0) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "still in use: %u cl, %u ch\n", + t->nclients, nc); + return GNUNET_OK; + } + } + if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) + { + /* Tunnel was incoming, notify clients */ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n", + t->local_tid, t->local_tid_dest); + send_clients_tunnel_destroy (t); + } + tunnel_send_destroy (t, parent); + t->destroy = GNUNET_YES; + // TODO: add timeout to destroy the tunnel anyway + return GNUNET_OK; +} + + +/** + * Core handler for mesh network traffic going from the origin to a peer + * + * @param cls closure + * @param peer peer identity this notification is about + * @param message message + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_Unicast *msg; + struct GNUNET_PeerIdentity *neighbor; + struct MeshTunnelChildInfo *cinfo; + struct MeshTunnel *t; + GNUNET_PEER_Id dest_id; + uint32_t pid; + uint32_t ttl; + size_t size; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n", + GNUNET_i2s (peer)); + /* Check size */ + size = ntohs (message->size); + if (size < + sizeof (struct GNUNET_MESH_Unicast) + + sizeof (struct GNUNET_MessageHeader)) + { + GNUNET_break (0); + return GNUNET_OK; + } + msg = (struct GNUNET_MESH_Unicast *) message; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n", + GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type))); + /* Check tunnel */ + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + if (NULL == t) + { + /* TODO notify back: we don't know this tunnel */ + GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO); + GNUNET_break_op (0); + return GNUNET_OK; + } + pid = ntohl (msg->pid); + if (t->fwd_pid == pid) + { + GNUNET_STATISTICS_update (stats, "# duplicate PID drops", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + " Already seen pid %u, DROPPING!\n", pid); + return GNUNET_OK; + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " pid %u not seen yet, forwarding\n", pid); + } + + t->skip += (pid - t->fwd_pid) - 1; + t->fwd_pid = pid; + + if (GMC_is_pid_bigger (pid, t->last_fwd_ack)) + { + GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO); + GNUNET_break_op (0); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Received PID %u, ACK %u\n", + pid, t->last_fwd_ack); + return GNUNET_OK; + } + + tunnel_reset_timeout (t); + dest_id = GNUNET_PEER_search (&msg->destination); + if (dest_id == myid) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " it's for us! sending to clients...\n"); + GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO); + send_subscribed_clients (message, &msg[1].header, t); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST); + return GNUNET_OK; + } + ttl = ntohl (msg->ttl); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl); + if (ttl == 0) + { + GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n"); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " not for us, retransmitting...\n"); + + neighbor = tree_get_first_hop (t->tree, dest_id); + cinfo = tunnel_get_neighbor_fc (t, neighbor); + cinfo->fwd_pid = pid; + GNUNET_CONTAINER_multihashmap_iterate (t->children_fc, + &tunnel_add_skip, + &neighbor); + if (GNUNET_YES == t->nobuffer && + GNUNET_YES == GMC_is_pid_bigger (pid, cinfo->fwd_ack)) + { + GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, " %u > %u\n", pid, cinfo->fwd_ack); + GNUNET_break_op (0); + return GNUNET_OK; + } + send_prebuilt_message (message, neighbor, t); + GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO); + return GNUNET_OK; +} + + +/** + * Core handler for mesh network traffic going from the origin to all peers + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + * + * TODO: Check who we got this from, to validate route. + */ +static int +handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_Multicast *msg; + struct MeshTunnel *t; + size_t size; + uint32_t pid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a multicast packet from %s\n", + GNUNET_i2s (peer)); + size = ntohs (message->size); + if (sizeof (struct GNUNET_MESH_Multicast) + + sizeof (struct GNUNET_MessageHeader) > size) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + msg = (struct GNUNET_MESH_Multicast *) message; + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + + if (NULL == t) + { + /* TODO notify that we dont know that tunnel */ + GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO); + GNUNET_break_op (0); + return GNUNET_OK; + } + pid = ntohl (msg->pid); + if (t->fwd_pid == pid) + { + /* already seen this packet, drop */ + GNUNET_STATISTICS_update (stats, "# duplicate PID drops", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Already seen pid %u, DROPPING!\n", pid); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK); + return GNUNET_OK; + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " pid %u not seen yet, forwarding\n", pid); + } + t->skip += (pid - t->fwd_pid) - 1; + t->fwd_pid = pid; + tunnel_reset_timeout (t); + + /* Transmit to locally interested clients */ + if (NULL != t->peers && + GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey)) + { + GNUNET_STATISTICS_update (stats, "# multicast received", 1, GNUNET_NO); + send_subscribed_clients (message, &msg[1].header, t); + tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_MULTICAST); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ntohl (msg->ttl)); + if (ntohl (msg->ttl) == 0) + { + GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n"); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK); + return GNUNET_OK; + } + GNUNET_STATISTICS_update (stats, "# multicast forwarded", 1, GNUNET_NO); + tunnel_send_multicast (t, message); + return GNUNET_OK; +} + + +/** + * Core handler for mesh network traffic toward the owner of a tunnel + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_ToOrigin *msg; + struct GNUNET_PeerIdentity id; + struct MeshPeerInfo *peer_info; + struct MeshTunnel *t; + struct MeshTunnelChildInfo *cinfo; + GNUNET_PEER_Id predecessor; + size_t size; + uint32_t pid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n", + GNUNET_i2s (peer)); + size = ntohs (message->size); + if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */ + sizeof (struct GNUNET_MessageHeader)) /* at least a header */ + { + GNUNET_break_op (0); + return GNUNET_OK; + } + msg = (struct GNUNET_MESH_ToOrigin *) message; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n", + GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type))); + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + pid = ntohl (msg->pid); + + if (NULL == t) + { + /* TODO notify that we dont know this tunnel (whom)? */ + GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Received to_origin with PID %u on unknown tunnel %s [%u]\n", + pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid)); + return GNUNET_OK; + } + + cinfo = tunnel_get_neighbor_fc(t, peer); + if (NULL == cinfo) + { + GNUNET_break (0); + return GNUNET_OK; + } + + if (cinfo->bck_pid == pid) + { + /* already seen this packet, drop */ + GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " Already seen pid %u, DROPPING!\n", pid); + tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK); + return GNUNET_OK; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " pid %u not seen yet, forwarding\n", pid); + cinfo->bck_pid = pid; + + if (NULL != t->owner) + { + char cbuf[size]; + struct GNUNET_MESH_ToOrigin *copy; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " it's for us! sending to clients...\n"); + /* TODO signature verification */ + memcpy (cbuf, message, size); + copy = (struct GNUNET_MESH_ToOrigin *) cbuf; + copy->tid = htonl (t->local_tid); + t->bck_pid++; + copy->pid = htonl (t->bck_pid); + GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO); + GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, + ©->header, GNUNET_NO); + tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " not for us, retransmitting...\n"); + + peer_info = peer_info_get (&msg->oid); + if (NULL == peer_info) + { + /* unknown origin of tunnel */ + GNUNET_break (0); + return GNUNET_OK; + } + predecessor = tree_get_predecessor (t->tree); + if (0 == predecessor) + { + if (GNUNET_YES == t->destroy) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "to orig received on a dying tunnel %s [%X]\n", + GNUNET_i2s (&msg->oid), ntohl(msg->tid)); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "unknown to origin at %s\n", + GNUNET_i2s (&my_full_id)); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "from peer %s\n", + GNUNET_i2s (peer)); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "for tunnel %s [%X]\n", + GNUNET_i2s (&msg->oid), ntohl(msg->tid)); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "current tree:\n"); + tree_debug (t->tree); + return GNUNET_OK; + } + GNUNET_PEER_resolve (predecessor, &id); + send_prebuilt_message (message, &id, t); + GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO); + + return GNUNET_OK; +} + + +/** + * Core handler for mesh network traffic point-to-point acks. + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_ACK *msg; + struct MeshTunnel *t; + uint32_t ack; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n", + GNUNET_i2s (peer)); + msg = (struct GNUNET_MESH_ACK *) message; + + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + + if (NULL == t) + { + /* TODO notify that we dont know this tunnel (whom)? */ + GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO); + return GNUNET_OK; + } + ack = ntohl (msg->pid); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack); + + /* Is this a forward or backward ACK? */ + if (tree_get_predecessor(t->tree) != GNUNET_PEER_search(peer)) + { + struct MeshTunnelChildInfo *cinfo; + + debug_bck_ack++; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n"); + cinfo = tunnel_get_neighbor_fc (t, peer); + cinfo->fwd_ack = ack; + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK); + tunnel_unlock_fwd_queues (t); + if (GNUNET_SCHEDULER_NO_TASK != cinfo->fc_poll) + { + GNUNET_SCHEDULER_cancel (cinfo->fc_poll); + cinfo->fc_poll = GNUNET_SCHEDULER_NO_TASK; + cinfo->fc_poll_time = GNUNET_TIME_UNIT_SECONDS; + } + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n"); + t->bck_ack = ack; + tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK); + tunnel_unlock_bck_queue (t); + } + return GNUNET_OK; +} + + +/** + * Core handler for mesh network traffic point-to-point ack polls. + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_Poll *msg; + struct MeshTunnel *t; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n", + GNUNET_i2s (peer)); + + msg = (struct GNUNET_MESH_Poll *) message; + + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + + if (NULL == t) + { + /* TODO notify that we dont know this tunnel (whom)? */ + GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO); + GNUNET_break_op (0); + return GNUNET_OK; + } + + /* Is this a forward or backward ACK? */ + if (tree_get_predecessor(t->tree) != GNUNET_PEER_search(peer)) + { + struct MeshTunnelChildInfo *cinfo; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n"); + cinfo = tunnel_get_neighbor_fc (t, peer); + cinfo->bck_ack = cinfo->fwd_pid; // mark as ready to send + tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL); + } + else + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n"); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL); + } + + return GNUNET_OK; +} + +/** + * Core handler for path ACKs + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + */ +static int +handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_PathACK *msg; + struct GNUNET_PeerIdentity id; + struct MeshPeerInfo *peer_info; + struct MeshPeerPath *p; + struct MeshTunnel *t; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n", + GNUNET_i2s (&my_full_id)); + msg = (struct GNUNET_MESH_PathACK *) message; + t = tunnel_get (&msg->oid, ntohl(msg->tid)); + if (NULL == t) + { + /* TODO notify that we don't know the tunnel */ + GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n", + GNUNET_i2s (&msg->oid), ntohl(msg->tid)); + return GNUNET_OK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n", + GNUNET_i2s (&msg->oid), ntohl(msg->tid)); + + peer_info = peer_info_get (&msg->peer_id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n", + GNUNET_i2s (&msg->peer_id)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", + GNUNET_i2s (peer)); + + if (NULL != t->regex_search && t->regex_search->peer == peer_info->id) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "connect_by_string completed, stopping search\n"); + regex_cancel_search (t->regex_search); + t->regex_search = NULL; + } + + /* Add paths to peers? */ + p = tree_get_path_to_peer (t->tree, peer_info->id); + if (NULL != p) + { + path_add_to_peers (p, GNUNET_YES); + path_destroy (p); + } + else + { + GNUNET_break (0); + } + + /* Message for us? */ + if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity))) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); + if (NULL == t->owner) + { + GNUNET_break_op (0); + return GNUNET_OK; + } + if (NULL != t->dht_get_type) + { + GNUNET_DHT_get_stop (t->dht_get_type); + t->dht_get_type = NULL; + } + if (tree_get_status (t->tree, peer_info->id) != MESH_PEER_READY) + { + tree_set_status (t->tree, peer_info->id, MESH_PEER_READY); + send_client_peer_connected (t, peer_info->id); + } + return GNUNET_OK; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " not for us, retransmitting...\n"); + GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id); + peer_info = peer_info_get (&msg->oid); + if (NULL == peer_info) + { + /* If we know the tunnel, we should DEFINITELY know the peer */ + GNUNET_break (0); + return GNUNET_OK; + } + send_prebuilt_message (message, &id, t); + return GNUNET_OK; +} + + +/** + * Core handler for mesh keepalives. + * + * @param cls closure + * @param message message + * @param peer peer identity this notification is about + * @param atsi performance data + * @param atsi_count number of records in 'atsi' + * @return GNUNET_OK to keep the connection open, + * GNUNET_SYSERR to close it (signal serious error) + * + * TODO: Check who we got this from, to validate route. + */ +static int +handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_MessageHeader *message, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct GNUNET_MESH_TunnelKeepAlive *msg; + struct MeshTunnel *t; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n", + GNUNET_i2s (peer)); + + msg = (struct GNUNET_MESH_TunnelKeepAlive *) message; + t = tunnel_get (&msg->oid, ntohl (msg->tid)); + + if (NULL == t) + { + /* TODO notify that we dont know that tunnel */ + GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1, + GNUNET_NO); + return GNUNET_OK; + } + + tunnel_reset_timeout (t); + + GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO); + tunnel_send_multicast (t, message); + return GNUNET_OK; + } + + + +/** + * Functions to handle messages from core + */ +static struct GNUNET_CORE_MessageHandler core_handlers[] = { + {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0}, + {&handle_mesh_path_destroy, GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY, 0}, + {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN, + sizeof (struct GNUNET_MESH_PathBroken)}, + {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, + sizeof (struct GNUNET_MESH_TunnelDestroy)}, + {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0}, + {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0}, + {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE, + sizeof (struct GNUNET_MESH_TunnelKeepAlive)}, + {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0}, + {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK, + sizeof (struct GNUNET_MESH_ACK)}, + {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL, + sizeof (struct GNUNET_MESH_Poll)}, + {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, + sizeof (struct GNUNET_MESH_PathACK)}, + {NULL, 0, 0} +}; + + + +/******************************************************************************/ +/**************** MESH LOCAL HANDLER HELPERS ***********************/ +/******************************************************************************/ + +/** + * deregister_app: iterator for removing each application registered by a client + * + * @param cls closure + * @param key the hash of the application id (used to access the hashmap) + * @param value the value stored at the key (client) + * + * @return GNUNET_OK on success + */ +static int +deregister_app (void *cls, const struct GNUNET_HashCode * key, void *value) +{ + struct GNUNET_CONTAINER_MultiHashMap *h = cls; + GNUNET_break (GNUNET_YES == + GNUNET_CONTAINER_multihashmap_remove (h, key, value)); + return GNUNET_OK; +} + +#if LATER +/** + * notify_client_connection_failure: notify a client that the connection to the + * requested remote peer is not possible (for instance, no route found) + * Function called when the socket is ready to queue more data. "buf" will be + * NULL and "size" zero if the socket was closed for writing in the meantime. + * + * @param cls closure + * @param size number of bytes available in buf + * @param buf where the callee should write the message + * @return number of bytes written to buf + */ +static size_t +notify_client_connection_failure (void *cls, size_t size, void *buf) +{ + int size_needed; + struct MeshPeerInfo *peer_info; + struct GNUNET_MESH_PeerControl *msg; + struct GNUNET_PeerIdentity id; + + if (0 == size && NULL == buf) + { + // TODO retry? cancel? + return 0; + } + + size_needed = sizeof (struct GNUNET_MESH_PeerControl); + peer_info = (struct MeshPeerInfo *) cls; + msg = (struct GNUNET_MESH_PeerControl *) buf; + msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); + msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED); +// msg->tunnel_id = htonl(peer_info->t->tid); + GNUNET_PEER_resolve (peer_info->id, &id); + memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity)); + + return size_needed; +} +#endif + + +/** + * Send keepalive packets for a peer + * + * @param cls Closure (tunnel for which to send the keepalive). + * @param tc Notification context. + */ +static void +path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct MeshTunnel *t = cls; + struct GNUNET_MESH_TunnelKeepAlive *msg; + size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive); + char cbuf[size]; + + t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK; + if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) + { + return; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "sending keepalive for tunnel %d\n", t->id.tid); + + msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf; + msg->header.size = htons (size); + msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE); + msg->oid = my_full_id; + msg->tid = htonl (t->id.tid); + tunnel_send_multicast (t, &msg->header); + + t->path_refresh_task = + GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t); + tunnel_reset_timeout(t); +} + + +/** + * Function to process paths received for a new peer addition. The recorded + * paths form the initial tunnel, which can be optimized later. + * Called on each result obtained for the DHT search. + * + * @param cls closure + * @param exp when will this value expire + * @param key key of the result + * @param get_path path of the get request + * @param get_path_length lenght of get_path + * @param put_path path of the put request + * @param put_path_length length of the put_path + * @param type type of the result + * @param size number of bytes in data + * @param data pointer to the result data + * + * TODO: re-issue the request after certain time? cancel after X results? + */ +static void +dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp, + const struct GNUNET_HashCode * key, + const struct GNUNET_PeerIdentity *get_path, + unsigned int get_path_length, + const struct GNUNET_PeerIdentity *put_path, + unsigned int put_path_length, enum GNUNET_BLOCK_Type type, + size_t size, const void *data) +{ + struct MeshPathInfo *path_info = cls; + struct MeshPeerPath *p; + struct GNUNET_PeerIdentity pi; + int i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n"); + GNUNET_PEER_resolve (path_info->peer->id, &pi); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi)); + + p = path_build_from_dht (get_path, get_path_length, put_path, + put_path_length); + path_add_to_peers (p, GNUNET_NO); + path_destroy(p); + for (i = 0; i < path_info->peer->ntunnels; i++) + { + tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer); + peer_info_connect (path_info->peer, path_info->t); + } + + return; +} + + +/** + * Function to process paths received for a new peer addition. The recorded + * paths form the initial tunnel, which can be optimized later. + * Called on each result obtained for the DHT search. + * + * @param cls closure + * @param exp when will this value expire + * @param key key of the result + * @param get_path path of the get request + * @param get_path_length lenght of get_path + * @param put_path path of the put request + * @param put_path_length length of the put_path + * @param type type of the result + * @param size number of bytes in data + * @param data pointer to the result data + */ +static void +dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp, + const struct GNUNET_HashCode * key, + const struct GNUNET_PeerIdentity *get_path, + unsigned int get_path_length, + const struct GNUNET_PeerIdentity *put_path, + unsigned int put_path_length, enum GNUNET_BLOCK_Type type, + size_t size, const void *data) +{ + const struct PBlock *pb = data; + const struct GNUNET_PeerIdentity *pi = &pb->id; + struct MeshTunnel *t = cls; + struct MeshPeerInfo *peer_info; + struct MeshPeerPath *p; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got type DHT result!\n"); + if (size != sizeof (struct PBlock)) + { + GNUNET_break_op (0); + return; + } + if (ntohl(pb->type) != t->type) + { + GNUNET_break_op (0); + return; + } + GNUNET_assert (NULL != t->owner); + peer_info = peer_info_get (pi); + (void) GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, + peer_info, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE); + + p = path_build_from_dht (get_path, get_path_length, put_path, + put_path_length); + path_add_to_peers (p, GNUNET_NO); + path_destroy(p); + tunnel_add_peer (t, peer_info); + peer_info_connect (peer_info, t); +} + + +/******************************************************************************/ +/********************* MESH LOCAL HANDLES **************************/ +/******************************************************************************/ + + +/** + * Handler for client disconnection + * + * @param cls closure + * @param client identification of the client; NULL + * for the last call when the server is destroyed + */ +static void +handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client) +{ + struct MeshClient *c; + struct MeshClient *next; + unsigned int i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected\n"); + if (client == NULL) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n"); + return; + } + + c = clients; + while (NULL != c) + { + if (c->handle != client) + { + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... searching\n"); + c = c->next; + continue; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n", + c->id); + GNUNET_SERVER_client_drop (c->handle); + c->shutting_down = GNUNET_YES; + GNUNET_assert (NULL != c->own_tunnels); + GNUNET_assert (NULL != c->incoming_tunnels); + GNUNET_CONTAINER_multihashmap_iterate (c->own_tunnels, + &tunnel_destroy_iterator, c); + GNUNET_CONTAINER_multihashmap_iterate (c->incoming_tunnels, + &tunnel_destroy_iterator, c); + GNUNET_CONTAINER_multihashmap_iterate (c->ignore_tunnels, + &tunnel_destroy_iterator, c); + GNUNET_CONTAINER_multihashmap_destroy (c->own_tunnels); + GNUNET_CONTAINER_multihashmap_destroy (c->incoming_tunnels); + GNUNET_CONTAINER_multihashmap_destroy (c->ignore_tunnels); + + /* deregister clients applications */ + if (NULL != c->apps) + { + GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, c->apps); + GNUNET_CONTAINER_multihashmap_destroy (c->apps); + } + if (0 == GNUNET_CONTAINER_multihashmap_size (applications) && + GNUNET_SCHEDULER_NO_TASK != announce_applications_task) + { + GNUNET_SCHEDULER_cancel (announce_applications_task); + announce_applications_task = GNUNET_SCHEDULER_NO_TASK; + } + if (NULL != c->types) + GNUNET_CONTAINER_multihashmap_destroy (c->types); + for (i = 0; i < c->n_regex; i++) + { + GNUNET_free (c->regexes[i].regex); + if (NULL != c->regexes[i].h) + GNUNET_REGEX_announce_cancel (c->regexes[i].h); + } + GNUNET_free_non_null (c->regexes); + if (GNUNET_SCHEDULER_NO_TASK != c->regex_announce_task) + GNUNET_SCHEDULER_cancel (c->regex_announce_task); + next = c->next; + GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c); + GNUNET_free (c); + GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO); + c = next; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " done!\n"); + return; +} + + +/** + * Handler for new clients + * + * @param cls closure + * @param client identification of the client + * @param message the actual message, which includes messages the client wants + */ +static void +handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_ClientConnect *cc_msg; + struct MeshClient *c; + GNUNET_MESH_ApplicationType *a; + unsigned int size; + uint16_t ntypes; + uint16_t *t; + uint16_t napps; + uint16_t i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected\n"); + /* Check data sanity */ + size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect); + cc_msg = (struct GNUNET_MESH_ClientConnect *) message; + ntypes = ntohs (cc_msg->types); + napps = ntohs (cc_msg->applications); + if (size != + ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Create new client structure */ + c = GNUNET_malloc (sizeof (struct MeshClient)); + c->id = next_client_id++; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT NEW %u\n", c->id); + c->handle = client; + GNUNET_SERVER_client_keep (client); + a = (GNUNET_MESH_ApplicationType *) &cc_msg[1]; + if (napps > 0) + { + GNUNET_MESH_ApplicationType at; + struct GNUNET_HashCode hc; + + c->apps = GNUNET_CONTAINER_multihashmap_create (napps, GNUNET_NO); + for (i = 0; i < napps; i++) + { + at = ntohl (a[i]); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " app type: %u\n", at); + GNUNET_CRYPTO_hash (&at, sizeof (at), &hc); + /* store in clients hashmap */ + GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, (void *) (long) at, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); + /* store in global hashmap, for announcements */ + GNUNET_CONTAINER_multihashmap_put (applications, &hc, c, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); + } + if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task) + announce_applications_task = + GNUNET_SCHEDULER_add_now (&announce_applications, NULL); + + } + if (ntypes > 0) + { + uint16_t u16; + struct GNUNET_HashCode hc; + + t = (uint16_t *) & a[napps]; + c->types = GNUNET_CONTAINER_multihashmap_create (ntypes, GNUNET_NO); + for (i = 0; i < ntypes; i++) + { + u16 = ntohs (t[i]); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " msg type: %u\n", u16); + GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc); + + /* store in clients hashmap */ + GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); + /* store in global hashmap */ + GNUNET_CONTAINER_multihashmap_put (types, &hc, c, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); + } + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " client has %u+%u subscriptions\n", napps, ntypes); + + GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c); + c->own_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + c->incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + c->ignore_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + GNUNET_SERVER_notification_context_add (nc, client); + GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO); + + GNUNET_SERVER_receive_done (client, GNUNET_OK); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n"); +} + + +/** + * Handler for clients announcing available services by a regular expression. + * + * @param cls closure + * @param client identification of the client + * @param message the actual message, which includes messages the client wants + */ +static void +handle_local_announce_regex (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + const struct GNUNET_MESH_RegexAnnounce *msg; + struct MeshRegexDescriptor rd; + struct MeshClient *c; + char *regex; + size_t len; + size_t offset; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "announce regex started\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + msg = (const struct GNUNET_MESH_RegexAnnounce *) message; + + len = ntohs (message->size) - sizeof(struct GNUNET_MESH_RegexAnnounce); + if (NULL != c->partial_regex) + { + regex = c->partial_regex; + offset = strlen (c->partial_regex); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " continuation, already have %u bytes\n", + offset); + } + else + { + regex = NULL; + offset = 0; + } + + regex = GNUNET_realloc (regex, offset + len + 1); + memcpy (®ex[offset], &msg[1], len); + regex[offset + len] = '\0'; + if (0 == ntohs (msg->last)) + { + c->partial_regex = regex; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " not ended, stored %u bytes for later\n", + len); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; + } + rd.regex = regex; + rd.compression = ntohs (msg->compression_characters); + rd.h = NULL; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " length %u\n", len); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regex %s\n", regex); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " cm %u\n", ntohs(rd.compression)); + GNUNET_array_append (c->regexes, c->n_regex, rd); + c->partial_regex = NULL; + if (GNUNET_SCHEDULER_NO_TASK == c->regex_announce_task) + { + c->regex_announce_task = GNUNET_SCHEDULER_add_now(®ex_announce, c); + } + else + { + regex_put(&rd); + } + GNUNET_SERVER_receive_done (client, GNUNET_OK); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "announce regex processed\n"); +} + + +/** + * Handler for requests of new tunnels + * + * @param cls closure + * @param client identification of the client + * @param message the actual message + */ +static void +handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_TunnelMessage *t_msg; + struct MeshTunnel *t; + struct MeshClient *c; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + /* Message sanity check */ + if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + t_msg = (struct GNUNET_MESH_TunnelMessage *) message; + /* Sanity check for tunnel numbering */ + tid = ntohl (t_msg->tunnel_id); + if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + /* Sanity check for duplicate tunnel IDs */ + if (NULL != tunnel_get_by_local_id (c, tid)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + while (NULL != tunnel_get_by_pi (myid, next_tid)) + next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; + t = tunnel_new (myid, next_tid++, c, tid); + if (NULL == t) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Tunnel creation failed.\n"); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + next_tid = next_tid & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s [%x] (%x)\n", + GNUNET_i2s (&my_full_id), t->id.tid, t->local_tid); + t->peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel created\n"); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; +} + + +/** + * Handler for requests of deleting tunnels + * + * @param cls closure + * @param client identification of the client + * @param message the actual message + */ +static void +handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_TunnelMessage *tunnel_msg; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a DESTROY TUNNEL from client!\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + /* Message sanity check */ + if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; + + /* Retrieve tunnel */ + tid = ntohl (tunnel_msg->tunnel_id); + t = tunnel_get_by_local_id(c, tid); + if (NULL == t) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + if (c != t->owner || tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) + { + client_ignore_tunnel (c, t); + tunnel_destroy_empty (t); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; + } + send_client_tunnel_disconnect (t, c); + client_delete_tunnel (c, t); + + /* Don't try to ACK the client about the tunnel_destroy multicast packet */ + t->owner = NULL; + tunnel_send_destroy (t, 0); + t->destroy = GNUNET_YES; + /* The tunnel will be destroyed when the last message is transmitted. */ + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; +} + + +/** + * Handler for requests of seeting tunnel's speed. + * + * @param cls Closure (unused). + * @param client Identification of the client. + * @param message The actual message. + */ +static void +handle_local_tunnel_speed (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_TunnelMessage *tunnel_msg; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a SPEED request from client!\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; + + /* Retrieve tunnel */ + tid = ntohl (tunnel_msg->tunnel_id); + t = tunnel_get_by_local_id(c, tid); + if (NULL == t) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " tunnel %X not found\n", tid); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + switch (ntohs(message->type)) + { + case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_MIN: + t->speed_min = GNUNET_YES; + break; + case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_MAX: + t->speed_min = GNUNET_NO; + break; + default: + GNUNET_break (0); + } + GNUNET_SERVER_receive_done (client, GNUNET_OK); +} + + +/** + * Handler for requests of seeting tunnel's buffering policy. + * + * @param cls Closure (unused). + * @param client Identification of the client. + * @param message The actual message. + */ +static void +handle_local_tunnel_buffer (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_TunnelMessage *tunnel_msg; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a BUFFER request from client!\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; + + /* Retrieve tunnel */ + tid = ntohl (tunnel_msg->tunnel_id); + t = tunnel_get_by_local_id(c, tid); + if (NULL == t) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + switch (ntohs(message->type)) + { + case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_BUFFER: + t->nobuffer = GNUNET_NO; + break; + case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_NOBUFFER: + t->nobuffer = GNUNET_YES; + break; + default: + GNUNET_break (0); + } + + GNUNET_SERVER_receive_done (client, GNUNET_OK); +} + + +/** + * Handler for connection requests to new peers + * + * @param cls closure + * @param client identification of the client + * @param message the actual message (PeerControl) + */ +static void +handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_PeerControl *peer_msg; + struct MeshPeerInfo *peer_info; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got connection request\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + peer_msg = (struct GNUNET_MESH_PeerControl *) message; + + /* Sanity check for message size */ + if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (peer_msg->tunnel_id); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Does client own tunnel? */ + if (t->owner->handle != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", + GNUNET_i2s (&peer_msg->peer)); + peer_info = peer_info_get (&peer_msg->peer); + + tunnel_add_peer (t, peer_info); + peer_info_connect (peer_info, t); + + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; +} + + +/** + * Handler for disconnection requests of peers in a tunnel + * + * @param cls closure + * @param client identification of the client + * @param message the actual message (PeerControl) + */ +static void +handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_PeerControl *peer_msg; + struct MeshPeerInfo *peer_info; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a PEER DEL request\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + peer_msg = (struct GNUNET_MESH_PeerControl *) message; + + /* Sanity check for message size */ + if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (peer_msg->tunnel_id); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", t->id.tid); + + /* Does client own tunnel? */ + if (t->owner->handle != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for peer %s\n", + GNUNET_i2s (&peer_msg->peer)); + /* Is the peer in the tunnel? */ + peer_info = + GNUNET_CONTAINER_multihashmap_get (t->peers, &peer_msg->peer.hashPubKey); + if (NULL == peer_info) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Ok, delete peer from tunnel */ + GNUNET_CONTAINER_multihashmap_remove_all (t->peers, + &peer_msg->peer.hashPubKey); + + send_destroy_path (t, peer_info->id); + tunnel_delete_peer (t, peer_info->id); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; +} + +/** + * Handler for blacklist requests of peers in a tunnel + * + * @param cls closure + * @param client identification of the client + * @param message the actual message (PeerControl) + * + * FIXME implement DHT block bloomfilter + */ +static void +handle_local_blacklist (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_PeerControl *peer_msg; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a PEER BLACKLIST request\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + peer_msg = (struct GNUNET_MESH_PeerControl *) message; + + /* Sanity check for message size */ + if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (peer_msg->tunnel_id); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", t->id.tid); + + GNUNET_array_append(t->blacklisted, t->nblacklisted, + GNUNET_PEER_intern(&peer_msg->peer)); +} + + +/** + * Handler for unblacklist requests of peers in a tunnel + * + * @param cls closure + * @param client identification of the client + * @param message the actual message (PeerControl) + */ +static void +handle_local_unblacklist (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_PeerControl *peer_msg; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + GNUNET_PEER_Id pid; + unsigned int i; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a PEER UNBLACKLIST request\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + peer_msg = (struct GNUNET_MESH_PeerControl *) message; + + /* Sanity check for message size */ + if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (peer_msg->tunnel_id); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", t->id.tid); + + /* if peer is not known, complain */ + pid = GNUNET_PEER_search (&peer_msg->peer); + if (0 == pid) + { + GNUNET_break (0); + return; + } + + /* search and remove from list */ + for (i = 0; i < t->nblacklisted; i++) + { + if (t->blacklisted[i] == pid) + { + t->blacklisted[i] = t->blacklisted[t->nblacklisted - 1]; + GNUNET_array_grow (t->blacklisted, t->nblacklisted, t->nblacklisted - 1); + return; + } + } + + /* if peer hasn't been blacklisted, complain */ + GNUNET_break (0); +} + + +/** + * Handler for connection requests to new peers by type + * + * @param cls closure + * @param client identification of the client + * @param message the actual message (ConnectPeerByType) + */ +static void +handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_ConnectPeerByType *connect_msg; + struct MeshClient *c; + struct MeshTunnel *t; + struct GNUNET_HashCode hash; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got connect by type request\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message; + + /* Sanity check for message size */ + if (sizeof (struct GNUNET_MESH_ConnectPeerByType) != + ntohs (connect_msg->header.size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (connect_msg->tunnel_id); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Does client own tunnel? */ + if (t->owner->handle != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Do WE have the service? */ + t->type = ntohl (connect_msg->type); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type requested: %u\n", t->type); + GNUNET_CRYPTO_hash (&t->type, sizeof (GNUNET_MESH_ApplicationType), &hash); + if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) == + GNUNET_YES) + { + /* Yes! Fast forward, add ourselves to the tunnel and send the + * good news to the client, and alert the destination client of + * an incoming tunnel. + * + * FIXME send a path create to self, avoid code duplication + */ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " available locally\n"); + GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey, + peer_info_get (&my_full_id), + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " notifying client\n"); + send_client_peer_connected (t, myid); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Done\n"); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + + t->local_tid_dest = next_local_tid++; + GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); + GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); + + return; + } + /* Ok, lets find a peer offering the service */ + if (NULL != t->dht_get_type) + { + GNUNET_DHT_get_stop (t->dht_get_type); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " looking in DHT for %s\n", + GNUNET_h2s (&hash)); + t->dht_get_type = + GNUNET_DHT_get_start (dht_handle, + GNUNET_BLOCK_TYPE_MESH_PEER_BY_TYPE, + &hash, + dht_replication_level, + GNUNET_DHT_RO_RECORD_ROUTE | + GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, + NULL, 0, + &dht_get_type_handler, t); + + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; +} + + +/** + * Handler for connection requests to new peers by a string service description. + * + * @param cls closure + * @param client identification of the client + * @param message the actual message, which includes messages the client wants + */ +static void +handle_local_connect_by_string (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_ConnectPeerByString *msg; + struct MeshRegexSearchInfo *info; + struct GNUNET_HashCode key; + struct MeshTunnel *t; + struct MeshClient *c; + MESH_TunnelNumber tid; + const char *string; + size_t size; + size_t len; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Connect by string started\n"); + msg = (struct GNUNET_MESH_ConnectPeerByString *) message; + size = htons (message->size); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + /* Message size sanity check */ + if (sizeof(struct GNUNET_MESH_ConnectPeerByString) >= size) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (msg->tunnel_id); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Does client own tunnel? */ + if (t->owner->handle != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " on tunnel %s [%u]\n", + GNUNET_i2s(&my_full_id), + t->id.tid); + + /* Only one connect_by_string allowed at the same time! */ + /* FIXME: allow more, return handle at api level to cancel, document */ + if (NULL != t->regex_search) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Find string itself */ + len = size - sizeof(struct GNUNET_MESH_ConnectPeerByString); + string = (const char *) &msg[1]; + + /* Initialize context */ + size = GNUNET_REGEX_get_first_key (string, len, &key); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " consumed %u bits out of %u\n", size, len); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " looking for %s\n", GNUNET_h2s (&key)); + + info = GNUNET_malloc (sizeof (struct MeshRegexSearchInfo)); + info->t = t; + info->description = GNUNET_strndup (string, len); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " string: %s\n", info->description); + + t->regex_search = info; + + info->search_handle = GNUNET_REGEX_search (dht_handle, + info->description, + ®ex_found_handler, info, + stats); + + GNUNET_SERVER_receive_done (client, GNUNET_OK); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "connect by string processed\n"); +} + + +/** + * Handler for client traffic directed to one peer + * + * @param cls closure + * @param client identification of the client + * @param message the actual message + */ +static void +handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct MeshClient *c; + struct MeshTunnel *t; + struct MeshPeerInfo *pi; + struct GNUNET_MESH_Unicast *data_msg; + MESH_TunnelNumber tid; + size_t size; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a unicast request from a client!\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + data_msg = (struct GNUNET_MESH_Unicast *) message; + + /* Sanity check for message size */ + size = ntohs (message->size); + if (sizeof (struct GNUNET_MESH_Unicast) + + sizeof (struct GNUNET_MessageHeader) > size) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (data_msg->tid); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Is it a local tunnel? Then, does client own the tunnel? */ + if (t->owner->handle != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + pi = GNUNET_CONTAINER_multihashmap_get (t->peers, + &data_msg->destination.hashPubKey); + /* Is the selected peer in the tunnel? */ + if (NULL == pi) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* PID should be as expected */ + if (ntohl (data_msg->pid) != t->fwd_pid + 1) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Unicast PID, expected %u, got %u\n", + t->fwd_pid + 1, ntohl (data_msg->pid)); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Ok, everything is correct, send the message + * (pretend we got it from a mesh peer) + */ + { + /* Work around const limitation */ + char buf[ntohs (message->size)] GNUNET_ALIGN; + struct GNUNET_MESH_Unicast *copy; + + copy = (struct GNUNET_MESH_Unicast *) buf; + memcpy (buf, data_msg, size); + copy->oid = my_full_id; + copy->tid = htonl (t->id.tid); + copy->ttl = htonl (default_ttl); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " calling generic handler...\n"); + handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL, 0); + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n"); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + + return; +} + + +/** + * Handler for client traffic directed to the origin + * + * @param cls closure + * @param client identification of the client + * @param message the actual message + */ +static void +handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_ToOrigin *data_msg; + struct MeshTunnelClientInfo *clinfo; + struct MeshClient *c; + struct MeshTunnel *t; + MESH_TunnelNumber tid; + size_t size; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a ToOrigin request from a client!\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + data_msg = (struct GNUNET_MESH_ToOrigin *) message; + + /* Sanity check for message size */ + size = ntohs (message->size); + if (sizeof (struct GNUNET_MESH_ToOrigin) + + sizeof (struct GNUNET_MessageHeader) > size) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (data_msg->tid); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid); + if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* It should be sent by someone who has this as incoming tunnel. */ + if (GNUNET_NO == client_knows_tunnel (c, t)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* PID should be as expected */ + clinfo = tunnel_get_client_fc (t, c); + if (ntohl (data_msg->pid) != clinfo->bck_pid + 1) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "To Origin PID, expected %u, got %u\n", + clinfo->bck_pid + 1, + ntohl (data_msg->pid)); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + clinfo->bck_pid++; + + /* Ok, everything is correct, send the message + * (pretend we got it from a mesh peer) + */ + { + char buf[ntohs (message->size)] GNUNET_ALIGN; + struct GNUNET_MESH_ToOrigin *copy; + + /* Work around const limitation */ + copy = (struct GNUNET_MESH_ToOrigin *) buf; + memcpy (buf, data_msg, size); + GNUNET_PEER_resolve (t->id.oid, ©->oid); + copy->tid = htonl (t->id.tid); + copy->ttl = htonl (default_ttl); + copy->pid = htonl (t->bck_pid + 1); + + copy->sender = my_full_id; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " calling generic handler...\n"); + handle_mesh_data_to_orig (NULL, &my_full_id, ©->header, NULL, 0); + } + GNUNET_SERVER_receive_done (client, GNUNET_OK); + + return; +} + + +/** + * Handler for client traffic directed to all peers in a tunnel + * + * @param cls closure + * @param client identification of the client + * @param message the actual message + */ +static void +handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct MeshClient *c; + struct MeshTunnel *t; + struct GNUNET_MESH_Multicast *data_msg; + MESH_TunnelNumber tid; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Got a multicast request from a client!\n"); + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + data_msg = (struct GNUNET_MESH_Multicast *) message; + + /* Sanity check for message size */ + if (sizeof (struct GNUNET_MESH_Multicast) + + sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size)) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Tunnel exists? */ + tid = ntohl (data_msg->tid); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id); + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* Does client own tunnel? */ + if (t->owner->handle != client) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + /* PID should be as expected */ + if (ntohl (data_msg->pid) != t->fwd_pid + 1) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + "Multicast PID, expected %u, got %u\n", + t->fwd_pid + 1, ntohl (data_msg->pid)); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + { + char buf[ntohs (message->size)] GNUNET_ALIGN; + struct GNUNET_MESH_Multicast *copy; + + copy = (struct GNUNET_MESH_Multicast *) buf; + memcpy (buf, message, ntohs (message->size)); + copy->oid = my_full_id; + copy->tid = htonl (t->id.tid); + copy->ttl = htonl (default_ttl); + GNUNET_assert (ntohl (copy->pid) == (t->fwd_pid + 1)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + " calling generic handler...\n"); + handle_mesh_data_multicast (client, &my_full_id, ©->header, NULL, 0); + } + + GNUNET_SERVER_receive_done (t->owner->handle, GNUNET_OK); + return; +} + + +/** + * Handler for client's ACKs for payload traffic. + * + * @param cls Closure (unused). + * @param client Identification of the client. + * @param message The actual message. + */ +static void +handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct GNUNET_MESH_LocalAck *msg; + struct MeshTunnel *t; + struct MeshClient *c; + MESH_TunnelNumber tid; + uint32_t ack; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n"); + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); + + msg = (struct GNUNET_MESH_LocalAck *) message; + + /* Tunnel exists? */ + tid = ntohl (msg->tunnel_id); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid); + t = tunnel_get_by_local_id (c, tid); + if (NULL == t) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid); + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + ack = ntohl (msg->max_pid); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ack); + + /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */ + if (NULL != t->owner && t->owner->handle == client) + { + /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */ + t->bck_ack = ack; + tunnel_send_bck_ack(t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK); + } + else + { + /* The client doesn't own the tunnel, this ACK is for FWD traffic. */ + tunnel_set_client_fwd_ack (t, c, ack); + tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK); + } + + GNUNET_SERVER_receive_done (client, GNUNET_OK); + + return; +} + + +/** + * Iterator over all peers to send a monitoring client info about a tunnel. + * + * @param cls Closure (message being built). + * @param key Key (hashed tunnel ID, unused). + * @param value Peer info. + * + * @return GNUNET_YES, to keep iterating. + */ +static int +monitor_peers_iterator (void *cls, + const struct GNUNET_HashCode * key, + void *value) +{ + struct GNUNET_MESH_LocalMonitor *msg = cls; + struct GNUNET_PeerIdentity *id; + struct MeshPeerInfo *info = value; + + id = (struct GNUNET_PeerIdentity *) &msg[1]; + GNUNET_PEER_resolve (info->id, &id[msg->npeers]); + msg->npeers++; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "* sending info about peer %s [%u]\n", + GNUNET_i2s (&id[msg->npeers - 1]), msg->npeers); + + return GNUNET_YES; +} + + + +/** + * Iterator over all tunnels to send a monitoring client info about each tunnel. + * + * @param cls Closure (client handle). + * @param key Key (hashed tunnel ID, unused). + * @param value Tunnel info. + * + * @return GNUNET_YES, to keep iterating. + */ +static int +monitor_all_tunnels_iterator (void *cls, + const struct GNUNET_HashCode * key, + void *value) +{ + struct GNUNET_SERVER_Client *client = cls; + struct MeshTunnel *t = value; + struct GNUNET_MESH_LocalMonitor *msg; + uint32_t npeers; + + npeers = GNUNET_CONTAINER_multihashmap_size (t->peers); + msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor) + + npeers * sizeof (struct GNUNET_PeerIdentity)); + GNUNET_PEER_resolve(t->id.oid, &msg->owner); + msg->tunnel_id = htonl (t->id.tid); + msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor) + + npeers * sizeof (struct GNUNET_PeerIdentity)); + msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS); + msg->npeers = 0; + (void) GNUNET_CONTAINER_multihashmap_iterate (t->peers, + monitor_peers_iterator, + msg); + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "* sending info about tunnel %s [%u] (%u peers)\n", + GNUNET_i2s (&msg->owner), t->id.tid, npeers); + + if (msg->npeers != npeers) + { + GNUNET_break (0); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Get tunnels fail: size %u - iter %u\n", + npeers, msg->npeers); + } + + msg->npeers = htonl (npeers); + GNUNET_SERVER_notification_context_unicast (nc, client, + &msg->header, GNUNET_NO); + return GNUNET_YES; +} + + +/** + * Handler for client's MONITOR request. + * + * @param cls Closure (unused). + * @param client Identification of the client. + * @param message The actual message. + */ +static void +handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + struct MeshClient *c; + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Received get tunnels request from client %u\n", + c->id); + GNUNET_CONTAINER_multihashmap_iterate (tunnels, + monitor_all_tunnels_iterator, + client); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Get tunnels request from client %u completed\n", + c->id); + GNUNET_SERVER_receive_done (client, GNUNET_OK); +} + + +/** + * Data needed to build a Monitor_Tunnel message. + */ +struct MeshMonitorTunnelContext +{ + /** + * Partial message, including peer count. + */ + struct GNUNET_MESH_LocalMonitor *msg; + + /** + * Hashmap with positions: peer->position. + */ + struct GNUNET_CONTAINER_MultiHashMap *lookup; + + /** + * Index of the parent of each peer in the message, realtive to the absolute + * order in the array (can be in a previous message). + */ + uint32_t parents[1024]; + + /** + * Peers visited so far in the tree, aka position of the current peer. + */ + unsigned int npeers; + + /** + * Client requesting the info. + */ + struct MeshClient *c; +}; + + +/** + * Send a client a message about the structure of a tunnel. + * + * @param ctx Context of the tunnel iteration, with info regarding the state + * of the execution and the number of peers visited for this message. + */ +static void +send_client_tunnel_info (struct MeshMonitorTunnelContext *ctx) +{ + struct GNUNET_MESH_LocalMonitor *resp = ctx->msg; + struct GNUNET_PeerIdentity *pid; + unsigned int *parent; + size_t size; + + size = sizeof (struct GNUNET_MESH_LocalMonitor); + size += (sizeof (struct GNUNET_PeerIdentity) + sizeof (int)) * resp->npeers; + resp->header.size = htons (size); + pid = (struct GNUNET_PeerIdentity *) &resp[1]; + parent = (unsigned int *) &pid[resp->npeers]; + memcpy (parent, ctx->parents, sizeof(uint32_t) * resp->npeers); + GNUNET_SERVER_notification_context_unicast (nc, ctx->c->handle, + &resp->header, GNUNET_NO); +} + +/** + * Iterator over a tunnel tree to build a message containing all peers + * the in the tunnel, including relay nodes. + * + * @param cls Closure (pointer to pointer of message being built). + * @param peer Short ID of a peer. + * @param parent Short ID of the @c peer 's parent. + */ +static void +tunnel_tree_iterator (void *cls, + GNUNET_PEER_Id peer, + GNUNET_PEER_Id parent) +{ + struct MeshMonitorTunnelContext *ctx = cls; + struct GNUNET_MESH_LocalMonitor *msg; + struct GNUNET_PeerIdentity *pid; + struct GNUNET_PeerIdentity ppid; + + msg = ctx->msg; + pid = (struct GNUNET_PeerIdentity *) &msg[1]; + GNUNET_PEER_resolve (peer, &pid[msg->npeers]); + GNUNET_CONTAINER_multihashmap_put (ctx->lookup, + &pid[msg->npeers].hashPubKey, + (void *) (long) ctx->npeers, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); + GNUNET_PEER_resolve (parent, &ppid); + ctx->parents[msg->npeers] = + htonl ((long) GNUNET_CONTAINER_multihashmap_get (ctx->lookup, + &ppid.hashPubKey)); + + ctx->npeers++; + msg->npeers++; + + if (sizeof (struct GNUNET_MESH_LocalMonitor) + + (msg->npeers + 1) * + (sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t)) + > USHRT_MAX) + { + send_client_tunnel_info (ctx); + msg->npeers = 0; + } +} + + +/** + * Handler for client's MONITOR_TUNNEL request. + * + * @param cls Closure (unused). + * @param client Identification of the client. + * @param message The actual message. + */ +static void +handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client, + const struct GNUNET_MessageHeader *message) +{ + const struct GNUNET_MESH_LocalMonitor *msg; + struct GNUNET_MESH_LocalMonitor *resp; + struct MeshMonitorTunnelContext ctx; + struct MeshClient *c; + struct MeshTunnel *t; + + /* Sanity check for client registration */ + if (NULL == (c = client_get (client))) + { + GNUNET_break (0); + GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); + return; + } + + msg = (struct GNUNET_MESH_LocalMonitor *) message; + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Received tunnel info request from client %u for tunnel %s[%X]\n", + c->id, + &msg->owner, + ntohl (msg->tunnel_id)); + t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id)); + if (NULL == t) + { + /* We don't know the tunnel */ + struct GNUNET_MESH_LocalMonitor warn; + + warn = *msg; + warn.npeers = htonl (UINT_MAX); + GNUNET_SERVER_notification_context_unicast (nc, client, + &warn.header, + GNUNET_NO); + GNUNET_SERVER_receive_done (client, GNUNET_OK); + return; + } + + /* Initialize context */ + resp = GNUNET_malloc (USHRT_MAX); /* avoid realloc'ing on each step */ + *resp = *msg; + resp->npeers = 0; + ctx.msg = resp; + ctx.lookup = GNUNET_CONTAINER_multihashmap_create (4 * t->peers_total, + GNUNET_YES); + ctx.c = c; + + /* Collect and send information */ + tree_iterate_all (t->tree, &tunnel_tree_iterator, &ctx); + send_client_tunnel_info (&ctx); + + /* Free context */ + GNUNET_CONTAINER_multihashmap_destroy (ctx.lookup); + GNUNET_free (resp); + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Monitor tunnel request from client %u completed\n", + c->id); + GNUNET_SERVER_receive_done (client, GNUNET_OK); +} + + +/** + * Functions to handle messages from clients + */ +static struct GNUNET_SERVER_MessageHandler client_handlers[] = { + {&handle_local_new_client, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0}, + {&handle_local_announce_regex, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_ANNOUNCE_REGEX, 0}, + {&handle_local_tunnel_create, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE, + sizeof (struct GNUNET_MESH_TunnelMessage)}, + {&handle_local_tunnel_destroy, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY, + sizeof (struct GNUNET_MESH_TunnelMessage)}, + {&handle_local_tunnel_speed, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_MIN, + sizeof (struct GNUNET_MESH_TunnelMessage)}, + {&handle_local_tunnel_speed, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_MAX, + sizeof (struct GNUNET_MESH_TunnelMessage)}, + {&handle_local_tunnel_buffer, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_BUFFER, + sizeof (struct GNUNET_MESH_TunnelMessage)}, + {&handle_local_tunnel_buffer, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_NOBUFFER, + sizeof (struct GNUNET_MESH_TunnelMessage)}, + {&handle_local_connect_add, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD, + sizeof (struct GNUNET_MESH_PeerControl)}, + {&handle_local_connect_del, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL, + sizeof (struct GNUNET_MESH_PeerControl)}, + {&handle_local_blacklist, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_BLACKLIST, + sizeof (struct GNUNET_MESH_PeerControl)}, + {&handle_local_unblacklist, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_UNBLACKLIST, + sizeof (struct GNUNET_MESH_PeerControl)}, + {&handle_local_connect_by_type, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE, + sizeof (struct GNUNET_MESH_ConnectPeerByType)}, + {&handle_local_connect_by_string, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_STRING, 0}, + {&handle_local_unicast, NULL, + GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0}, + {&handle_local_to_origin, NULL, + GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0}, + {&handle_local_multicast, NULL, + GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0}, + {&handle_local_ack, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, + sizeof (struct GNUNET_MESH_LocalAck)}, + {&handle_local_get_tunnels, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS, + sizeof (struct GNUNET_MessageHeader)}, + {&handle_local_show_tunnel, NULL, + GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL, + sizeof (struct GNUNET_MESH_LocalMonitor)}, + {NULL, NULL, 0, 0} +}; + + +/** + * To be called on core init/fail. + * + * @param cls service closure + * @param server handle to the server for this service + * @param identity the public identity of this peer + */ +static void +core_init (void *cls, struct GNUNET_CORE_Handle *server, + const struct GNUNET_PeerIdentity *identity) +{ + static int i = 0; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n"); + core_handle = server; + if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) || + NULL == server) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n")); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + " core id %s\n", + GNUNET_i2s (identity)); + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + " my id %s\n", + GNUNET_i2s (&my_full_id)); + GNUNET_SCHEDULER_shutdown (); // Try gracefully + if (10 < i++) + GNUNET_abort(); // Try harder + } + return; +} + + +/** + * Method called whenever a given peer connects. + * + * @param cls closure + * @param peer peer identity this notification is about + * @param atsi performance data for the connection + * @param atsi_count number of records in 'atsi' + */ +static void +core_connect (void *cls, const struct GNUNET_PeerIdentity *peer, + const struct GNUNET_ATS_Information *atsi, + unsigned int atsi_count) +{ + struct MeshPeerInfo *peer_info; + struct MeshPeerPath *path; + + DEBUG_CONN ("Peer connected\n"); + DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id)); + peer_info = peer_info_get (peer); + if (myid == peer_info->id) + { + DEBUG_CONN (" (self)\n"); + return; + } + else + { + DEBUG_CONN (" %s\n", GNUNET_i2s (peer)); + } + path = path_new (2); + path->peers[0] = myid; + path->peers[1] = peer_info->id; + GNUNET_PEER_change_rc (myid, 1); + GNUNET_PEER_change_rc (peer_info->id, 1); + peer_info_add_path (peer_info, path, GNUNET_YES); + GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO); + return; +} + + +/** + * Method called whenever a peer disconnects. + * + * @param cls closure + * @param peer peer identity this notification is about + */ +static void +core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer) +{ + struct MeshPeerInfo *pi; + struct MeshPeerQueue *q; + struct MeshPeerQueue *n; + + DEBUG_CONN ("Peer disconnected\n"); + pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); + if (NULL == pi) + { + GNUNET_break (0); + return; + } + q = pi->queue_head; + while (NULL != q) + { + n = q->next; + /* TODO try to reroute this traffic instead */ + queue_destroy(q, GNUNET_YES); + q = n; + } + if (NULL != pi->core_transmit) + { + GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit); + pi->core_transmit = NULL; + } + peer_info_remove_path (pi, pi->id, myid); + if (myid == pi->id) + { + DEBUG_CONN (" (self)\n"); + } + GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO); + return; +} + + +/******************************************************************************/ +/************************ MAIN FUNCTIONS ****************************/ +/******************************************************************************/ + +/** + * Iterator over tunnel hash map entries to destroy the tunnel during shutdown. + * + * @param cls closure + * @param key current key code + * @param value value in the hash map + * @return GNUNET_YES if we should continue to iterate, + * GNUNET_NO if not. + */ +static int +shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value) +{ + struct MeshTunnel *t = value; + + tunnel_destroy (t); + return GNUNET_YES; +} + +/** + * Iterator over peer hash map entries to destroy the tunnel during shutdown. + * + * @param cls closure + * @param key current key code + * @param value value in the hash map + * @return GNUNET_YES if we should continue to iterate, + * GNUNET_NO if not. + */ +static int +shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value) +{ + struct MeshPeerInfo *p = value; + struct MeshPeerQueue *q; + struct MeshPeerQueue *n; + + q = p->queue_head; + while (NULL != q) + { + n = q->next; + if (q->peer == p) + { + queue_destroy(q, GNUNET_YES); + } + q = n; + } + peer_info_destroy (p); + return GNUNET_YES; +} + + +/** + * Task run during shutdown. + * + * @param cls unused + * @param tc unused + */ +static void +shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n"); + + if (core_handle != NULL) + { + GNUNET_CORE_disconnect (core_handle); + core_handle = NULL; + } + if (NULL != keygen) + { + GNUNET_CRYPTO_rsa_key_create_stop (keygen); + keygen = NULL; + } + GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL); + GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL); + if (dht_handle != NULL) + { + GNUNET_DHT_disconnect (dht_handle); + dht_handle = NULL; + } + if (nc != NULL) + { + GNUNET_SERVER_notification_context_destroy (nc); + nc = NULL; + } + if (GNUNET_SCHEDULER_NO_TASK != announce_id_task) + { + GNUNET_SCHEDULER_cancel (announce_id_task); + announce_id_task = GNUNET_SCHEDULER_NO_TASK; + } + if (GNUNET_SCHEDULER_NO_TASK != announce_applications_task) + { + GNUNET_SCHEDULER_cancel (announce_applications_task); + announce_applications_task = GNUNET_SCHEDULER_NO_TASK; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n"); +} + + +/** + * Callback for hostkey read/generation + * + * @param cls Closure (Configuration handle). + * @param pk the private key + * @param emsg error message + */ +static void +key_generation_cb (void *cls, + struct GNUNET_CRYPTO_RsaPrivateKey *pk, + const char *emsg) +{ + const struct GNUNET_CONFIGURATION_Handle *c = cls; + struct MeshPeerInfo *peer; + struct MeshPeerPath *p; + + keygen = NULL; + if (NULL == pk) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _("Mesh service could not access hostkey: %s. Exiting.\n"), + emsg); + GNUNET_SCHEDULER_shutdown (); + return; + } + my_private_key = pk; + GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key); + GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key), + &my_full_id.hashPubKey); + myid = GNUNET_PEER_intern (&my_full_id); + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Mesh for peer [%s] starting\n", + GNUNET_i2s(&my_full_id)); + +// transport_handle = GNUNET_TRANSPORT_connect(c, +// &my_full_id, +// NULL, +// NULL, +// NULL, +// NULL); + + core_handle = GNUNET_CORE_connect (c, /* Main configuration */ + NULL, /* Closure passed to MESH functions */ + &core_init, /* Call core_init once connected */ + &core_connect, /* Handle connects */ + &core_disconnect, /* remove peers on disconnects */ + NULL, /* Don't notify about all incoming messages */ + GNUNET_NO, /* For header only in notification */ + NULL, /* Don't notify about all outbound messages */ + GNUNET_NO, /* For header-only out notification */ + core_handlers); /* Register these handlers */ + + if (core_handle == NULL) + { + GNUNET_break (0); + GNUNET_SCHEDULER_shutdown (); + return; + } + + next_tid = 0; + next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; + + + GNUNET_SERVER_add_handlers (server_handle, client_handlers); + nc = GNUNET_SERVER_notification_context_create (server_handle, 1); + GNUNET_SERVER_disconnect_notify (server_handle, + &handle_local_client_disconnect, NULL); + + + clients = NULL; + clients_tail = NULL; + next_client_id = 0; + + announce_applications_task = GNUNET_SCHEDULER_NO_TASK; + announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls); + + /* Create a peer_info for the local peer */ + peer = peer_info_get (&my_full_id); + p = path_new (1); + p->peers[0] = myid; + GNUNET_PEER_change_rc (myid, 1); + peer_info_add_path (peer, p, GNUNET_YES); + GNUNET_SERVER_resume (server_handle); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n"); +} + + +/** + * Process mesh requests. + * + * @param cls closure + * @param server the initialized server + * @param c configuration to use + */ +static void +run (void *cls, struct GNUNET_SERVER_Handle *server, + const struct GNUNET_CONFIGURATION_Handle *c) +{ + char *keyfile; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n"); + server_handle = server; + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY", + &keyfile)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "hostkey"); + GNUNET_SCHEDULER_shutdown (); + return; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME", + &refresh_path_time)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "refresh path time"); + GNUNET_SCHEDULER_shutdown (); + return; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (c, "MESH", "APP_ANNOUNCE_TIME", + &app_announce_time)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "app announce time"); + GNUNET_SCHEDULER_shutdown (); + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "APP_ANNOUNCE_TIME %llu ms\n", + app_announce_time.rel_value); + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME", + &id_announce_time)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "id announce time"); + GNUNET_SCHEDULER_shutdown (); + return; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT", + &connect_timeout)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "connect timeout"); + GNUNET_SCHEDULER_shutdown (); + return; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE", + &max_msgs_queue)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "max msgs queue"); + GNUNET_SCHEDULER_shutdown (); + return; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS", + &max_tunnels)) + { + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + _ + ("%s service is lacking key configuration settings (%s). Exiting.\n"), + "mesh", "max tunnels"); + GNUNET_SCHEDULER_shutdown (); + return; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL", + &default_ttl)) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + _ + ("%s service is lacking key configuration settings (%s). Using default (%u).\n"), + "mesh", "default ttl", 64); + default_ttl = 64; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS", + &max_peers)) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + _("%s service is lacking key configuration settings (%s). Using default (%u).\n"), + "mesh", "max peers", 1000); + max_peers = 1000; + } + + if (GNUNET_OK != + GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL", + &dht_replication_level)) + { + GNUNET_log (GNUNET_ERROR_TYPE_WARNING, + _ + ("%s service is lacking key configuration settings (%s). Using default (%u).\n"), + "mesh", "dht replication level", 3); + dht_replication_level = 3; + } + + tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + applications = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + types = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); + + dht_handle = GNUNET_DHT_connect (c, 64); + if (NULL == dht_handle) + { + GNUNET_break (0); + } + stats = GNUNET_STATISTICS_create ("mesh", c); + + GNUNET_SERVER_suspend (server_handle); + /* Scheduled the task to clean up when shutdown is called */ + GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, + NULL); + keygen = GNUNET_CRYPTO_rsa_key_create_start (keyfile, + &key_generation_cb, + (void *) c); + GNUNET_free (keyfile); +} + + +/** + * The main function for the mesh service. + * + * @param argc number of arguments from the command line + * @param argv command line arguments + * @return 0 ok, 1 on error + */ +int +main (int argc, char *const *argv) +{ + int ret; + int r; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n"); + r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run, + NULL); + ret = (GNUNET_OK == r) ? 0 : 1; + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n"); + + INTERVAL_SHOW; + + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n", + GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack); + + return ret; +} |