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|
/*
This file is part of GNUnet
(C) 2002-2013 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 transport/plugin_transport_http_server.c
* @brief HTTP/S server transport plugin
* @author Matthias Wachs
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_statistics_service.h"
#include "gnunet_transport_plugin.h"
#include "gnunet_nat_lib.h"
#include "plugin_transport_http_common.h"
#include <microhttpd.h>
#if BUILD_HTTPS
#define PLUGIN_NAME "https_server"
#define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_https_server_init
#define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_https_server_done
#else
#define PLUGIN_NAME "http_server"
#define LIBGNUNET_PLUGIN_TRANSPORT_INIT libgnunet_plugin_transport_http_server_init
#define LIBGNUNET_PLUGIN_TRANSPORT_DONE libgnunet_plugin_transport_http_server_done
#endif
#define HTTP_ERROR_RESPONSE "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\"><HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY><H1>Not Found</H1>The requested URL was not found on this server.<P><HR><ADDRESS></ADDRESS></BODY></HTML>"
#define _RECEIVE 0
#define _SEND 1
/**
* Enable output for debbuging URL's of incoming requests
*/
#define DEBUG_URL_PARSE GNUNET_NO
/**
* Encapsulation of all of the state of the plugin.
*/
struct Plugin;
/**
* Session handle for connections.
*/
struct Session
{
/**
* Stored in a linked list.
*/
struct Session *next;
/**
* Stored in a linked list.
*/
struct Session *prev;
/**
* To whom are we talking to (set to our identity
* if we are still waiting for the welcome message)
*/
struct GNUNET_PeerIdentity target;
/**
* Pointer to the global plugin struct.
*/
struct HTTP_Server_Plugin *plugin;
/**
* next pointer for double linked list
*/
struct HTTP_Message *msg_head;
/**
* previous pointer for double linked list
*/
struct HTTP_Message *msg_tail;
/**
* Message stream tokenizer for incoming data
*/
struct GNUNET_SERVER_MessageStreamTokenizer *msg_tk;
/**
* Client send handle
*/
struct ServerConnection *server_recv;
/**
* Client send handle
*/
struct ServerConnection *server_send;
/**
* Address
*/
void *addr;
/**
* Address length
*/
size_t addrlen;
/**
* Unique HTTP/S connection tag for this connection
*/
uint32_t tag;
/**
* ATS network type in NBO
*/
uint32_t ats_address_network_type;
/**
* Was session given to transport service?
*/
int session_passed;
/**
* Did we immediately end the session in disconnect_cb
*/
int session_ended;
/**
* Are incoming connection established at the moment
*/
int connect_in_progress;
/**
* Absolute time when to receive data again
* Used for receive throttling
*/
struct GNUNET_TIME_Absolute next_receive;
/**
* Session timeout task
*/
GNUNET_SCHEDULER_TaskIdentifier timeout_task;
};
struct ServerConnection
{
/**
* _RECV or _SEND
*/
int direction;
/**
* Should this connection get disconnected? GNUNET_YES/NO
*/
int disconnect;
/**
* For PUT connections: Is this the first or last callback with size 0
*/
int connected;
/**
* The session this server connection belongs to
*/
struct Session *session;
/**
* The MHD connection
*/
struct MHD_Connection *mhd_conn;
/**
* The MHD daemon
*/
struct MHD_Daemon *mhd_daemon;
};
/**
* Encapsulation of all of the state of the plugin.
*/
struct HTTP_Server_Plugin
{
/**
* Our environment.
*/
struct GNUNET_TRANSPORT_PluginEnvironment *env;
/**
* Linked list head of open sessions.
*/
struct Session *head;
/**
* Linked list tail of open sessions.
*/
struct Session *tail;
/**
* Plugin name
*/
char *name;
/**
* Protocol
*/
char *protocol;
/**
* My options to be included in the address
*/
uint32_t options;
/**
* External address
*/
char *external_hostname;
/**
* Verify external address
*/
int verify_external_hostname;
/**
* Maximum number of sockets the plugin can use
* Each http inbound /outbound connections are two connections
*/
unsigned int max_connections;
/**
* Current number of sockets the plugin can use
* Each http inbound /outbound connections are two connections
*/
unsigned int cur_connections;
/**
* Did we immediately end the session in disconnect_cb
*/
int in_shutdown;
/**
* Length of peer id
*/
int peer_id_length;
/**
* External hostname the plugin can be connected to, can be different to
* the host's FQDN, used e.g. for reverse proxying
*/
struct HttpAddress *ext_addr;
/**
* Notify transport only about external address
*/
unsigned int external_only;
/**
* External address length
*/
size_t ext_addr_len;
/**
* use IPv6
*/
uint16_t use_ipv6;
/**
* use IPv4
*/
uint16_t use_ipv4;
/**
* Port used
*/
uint16_t port;
/**
* Task calling transport service about external address
*/
GNUNET_SCHEDULER_TaskIdentifier notify_ext_task;
/**
* NAT handle & address management
*/
struct GNUNET_NAT_Handle *nat;
/**
* List of own addresses
*/
/**
* IPv4 addresses DLL head
*/
struct HttpAddressWrapper *addr_head;
/**
* IPv4 addresses DLL tail
*/
struct HttpAddressWrapper *addr_tail;
/**
* IPv4 server socket to bind to
*/
struct sockaddr_in *server_addr_v4;
/**
* IPv6 server socket to bind to
*/
struct sockaddr_in6 *server_addr_v6;
/**
* MHD IPv4 task
*/
GNUNET_SCHEDULER_TaskIdentifier server_v4_task;
/**
* MHD IPv6 task
*/
GNUNET_SCHEDULER_TaskIdentifier server_v6_task;
/**
* The IPv4 server is scheduled to run asap
*/
int server_v4_immediately;
/**
* The IPv6 server is scheduled to run asap
*/
int server_v6_immediately;
/**
* MHD IPv4 daemon
*/
struct MHD_Daemon *server_v4;
/**
* MHD IPv4 daemon
*/
struct MHD_Daemon *server_v6;
#if BUILD_HTTPS
/**
* Crypto related
*
* Example:
*
* Use RC4-128 instead of AES:
* NONE:+VERS-TLS1.0:+ARCFOUR-128:+SHA1:+RSA:+COMP-NULL
*
*/
char *crypto_init;
/**
* TLS key
*/
char *key;
/**
* TLS certificate
*/
char *cert;
#endif
};
/**
* Wrapper to manage addresses
*/
struct HttpAddressWrapper
{
/**
* Linked list next
*/
struct HttpAddressWrapper *next;
/**
* Linked list previous
*/
struct HttpAddressWrapper *prev;
struct HttpAddress *address;
size_t addrlen;
};
/**
* Message to send using http
*/
struct HTTP_Message
{
/**
* next pointer for double linked list
*/
struct HTTP_Message *next;
/**
* previous pointer for double linked list
*/
struct HTTP_Message *prev;
/**
* buffer containing data to send
*/
char *buf;
/**
* amount of data already sent
*/
size_t pos;
/**
* buffer length
*/
size_t size;
/**
* HTTP/S specific overhead
*/
size_t overhead;
/**
* Continuation function to call once the transmission buffer
* has again space available. NULL if there is no
* continuation to call.
*/
GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
/**
* Closure for transmit_cont.
*/
void *transmit_cont_cls;
};
/**
* Start session timeout for session s
* @param s the session
*/
static void
server_start_session_timeout (struct Session *s);
/**
* Increment session timeout due to activity for session s
* @param s the session
*/
static void
server_reschedule_session_timeout (struct Session *s);
/**
* Cancel timeout for session s
* @param s the session
*/
static void
server_stop_session_timeout (struct Session *s);
/**
* Disconnect session @a s
*
* @param cls closure with the `struct HTTP_Server_Plugin`
* @param s the session
* @return #GNUNET_OK on success
*/
static int
http_server_plugin_disconnect_session (void *cls,
struct Session *s);
/**
* Does session s exist?
*
* @param plugin the plugin handle
* @param s the session
* @return #GNUNET_YES on success, #GNUNET_NO on error
*/
static int
server_exist_session (struct HTTP_Server_Plugin *plugin, struct Session *s);
/**
* Reschedule the execution of both IPv4 and IPv6 server
* @param plugin the plugin
* @param server which server to schedule v4 or v6?
* @param now #GNUNET_YES to schedule execution immediately, #GNUNET_NO to wait
* until timeout
*/
static void
server_reschedule (struct HTTP_Server_Plugin *plugin,
struct MHD_Daemon *server,
int now);
/**
* Function that can be used by the transport service to transmit
* a message using the plugin. Note that in the case of a
* peer disconnecting, the continuation MUST be called
* prior to the disconnect notification itself. This function
* will be called with this peer's HELLO message to initiate
* a fresh connection to another peer.
*
* @param cls closure
* @param session which session must be used
* @param msgbuf the message to transmit
* @param msgbuf_size number of bytes in @a msgbuf
* @param priority how important is the message (most plugins will
* ignore message priority and just FIFO)
* @param to how long to wait at most for the transmission (does not
* require plugins to discard the message after the timeout,
* just advisory for the desired delay; most plugins will ignore
* this as well)
* @param cont continuation to call once the message has
* been transmitted (or if the transport is ready
* for the next transmission call; or if the
* peer disconnected...); can be NULL
* @param cont_cls closure for @a cont
* @return number of bytes used (on the physical network, with overheads);
* -1 on hard errors (i.e. address invalid); 0 is a legal value
* and does NOT mean that the message was not transmitted (DV)
*/
static ssize_t
http_server_plugin_send (void *cls,
struct Session *session,
const char *msgbuf, size_t msgbuf_size,
unsigned int priority,
struct GNUNET_TIME_Relative to,
GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
{
struct HTTP_Server_Plugin *plugin = cls;
struct HTTP_Message *msg;
int bytes_sent = 0;
char *stat_txt;
GNUNET_assert (plugin != NULL);
GNUNET_assert (session != NULL);
if (GNUNET_NO == server_exist_session (plugin, session))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
if (NULL == session->server_send)
{
if (GNUNET_NO == session->connect_in_progress)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, session->plugin->name,
"Session %p/connection %p: Sending message with %u bytes to peer `%s' with FAILED\n",
session, session->server_send,
msgbuf_size, GNUNET_i2s (&session->target));
GNUNET_break (0);
return GNUNET_SYSERR;
}
}
else
{
if (GNUNET_YES == session->server_send->disconnect)
return GNUNET_SYSERR;
}
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, session->plugin->name,
"Session %p/connection %p: Sending message with %u to peer `%s' with \n",
session, session->server_send,
msgbuf_size, GNUNET_i2s (&session->target));
/* create new message and schedule */
bytes_sent = sizeof (struct HTTP_Message) + msgbuf_size;
msg = GNUNET_malloc (bytes_sent);
msg->next = NULL;
msg->size = msgbuf_size;
msg->pos = 0;
msg->buf = (char *) &msg[1];
msg->transmit_cont = cont;
msg->transmit_cont_cls = cont_cls;
memcpy (msg->buf, msgbuf, msgbuf_size);
GNUNET_CONTAINER_DLL_insert_tail (session->msg_head, session->msg_tail, msg);
GNUNET_asprintf (&stat_txt, "# bytes currently in %s_server buffers", plugin->protocol);
GNUNET_STATISTICS_update (plugin->env->stats,
stat_txt, msgbuf_size, GNUNET_NO);
GNUNET_free (stat_txt);
if (NULL != session->server_send)
{
server_reschedule (session->plugin,
session->server_send->mhd_daemon,
GNUNET_YES);
}
return bytes_sent;
}
/**
* Function that can be used to force the plugin to disconnect
* from the given peer and cancel all previous transmissions
* (and their continuationc).
*
* @param cls closure
* @param target peer from which to disconnect
*/
static void
http_server_plugin_disconnect_peer (void *cls,
const struct GNUNET_PeerIdentity *target)
{
struct HTTP_Server_Plugin *plugin = cls;
struct Session *next;
struct Session *pos;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Transport tells me to disconnect `%s'\n",
GNUNET_i2s (target));
next = plugin->head;
while (NULL != (pos = next))
{
next = pos->next;
if (0 == memcmp (target, &pos->target, sizeof (struct GNUNET_PeerIdentity)))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Disconnecting session %p to `%s'\n",
pos, GNUNET_i2s (target));
http_server_plugin_disconnect_session (plugin, pos);
}
}
}
/**
* Another peer has suggested an address for this
* peer and transport plugin. Check that this could be a valid
* address. If so, consider adding it to the list
* of addresses.
*
* @param cls closure
* @param addr pointer to the address
* @param addrlen length of @a addr
* @return #GNUNET_OK if this is a plausible address for this peer
* and transport
*/
static int
http_server_plugin_address_suggested (void *cls,
const void *addr,
size_t addrlen)
{
struct HTTP_Server_Plugin *plugin = cls;
struct HttpAddressWrapper *next;
struct HttpAddressWrapper *pos;
const struct HttpAddress *haddr = addr;
if ((NULL != plugin->ext_addr) &&
GNUNET_YES == (http_common_cmp_addresses (addr, addrlen,
plugin->ext_addr,
plugin->ext_addr_len)))
{
/* Checking HTTP_OPTIONS_VERIFY_CERTIFICATE option for external hostname */
if ((ntohl (haddr->options) & HTTP_OPTIONS_VERIFY_CERTIFICATE) !=
(plugin->options & HTTP_OPTIONS_VERIFY_CERTIFICATE))
return GNUNET_NO; /* VERIFY option not set as required! */
return GNUNET_OK;
}
next = plugin->addr_head;
while (NULL != (pos = next))
{
next = pos->next;
if (GNUNET_YES == (http_common_cmp_addresses(addr,
addrlen,
pos->address,
pos->addrlen)))
return GNUNET_OK;
}
return GNUNET_NO;
}
/**
* Creates a new outbound session the transport
* service will use to send data to the peer
*
* Since HTTP/S server cannot create sessions, always return NULL
*
* @param cls the plugin
* @param address the address
* @return always NULL
*/
static struct Session *
http_server_plugin_get_session (void *cls,
const struct GNUNET_HELLO_Address *address)
{
return NULL;
}
/**
* Deleting the session
* Must not be used afterwards
*
* @param cls closure with the `struct HTTP_ServerPlugin`
* @param s the session to delete
* @return #GNUNET_OK on success
*/
static int
server_delete_session (void *cls,
struct Session *s)
{
struct HTTP_Server_Plugin *plugin = cls;
struct HTTP_Message *msg;
struct HTTP_Message *tmp;
server_stop_session_timeout(s);
GNUNET_CONTAINER_DLL_remove (plugin->head, plugin->tail, s);
msg = s->msg_head;
while (NULL != msg)
{
tmp = msg->next;
GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg);
if (NULL != msg->transmit_cont)
msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_SYSERR,
msg->size, msg->pos + msg->overhead);
GNUNET_free (msg);
msg = tmp;
}
if (NULL != s->msg_tk)
{
GNUNET_SERVER_mst_destroy (s->msg_tk);
s->msg_tk = NULL;
}
GNUNET_free (s->addr);
GNUNET_free_non_null (s->server_recv);
GNUNET_free_non_null (s->server_send);
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
plugin->name,
"Session %p destroyed\n", s);
GNUNET_free (s);
return GNUNET_OK;
}
/**
* Cancel timeout for session s
*
* @param s the session
*/
static void
server_stop_session_timeout (struct Session *s)
{
GNUNET_assert (NULL != s);
if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
{
GNUNET_SCHEDULER_cancel (s->timeout_task);
s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
GNUNET_log (TIMEOUT_LOG, "Timeout stopped for session %p\n", s);
}
}
/**
* Function that queries MHD's select sets and
* starts the task waiting for them.
* @param plugin plugin
* @param daemon_handle the MHD daemon handle
* @param now schedule immediately
* @return task identifier
*/
static GNUNET_SCHEDULER_TaskIdentifier
server_schedule (struct HTTP_Server_Plugin *plugin,
struct MHD_Daemon *daemon_handle,
int now);
/**
* Reschedule the execution of both IPv4 and IPv6 server
* @param plugin the plugin
* @param server which server to schedule v4 or v6?
* @param now #GNUNET_YES to schedule execution immediately, #GNUNET_NO to wait
* until timeout
*/
static void
server_reschedule (struct HTTP_Server_Plugin *plugin,
struct MHD_Daemon *server,
int now)
{
if ((server == plugin->server_v4) && (plugin->server_v4 != NULL))
{
if (GNUNET_YES == plugin->server_v4_immediately)
return; /* No rescheduling, server will run asap */
if (GNUNET_YES == now)
plugin->server_v4_immediately = GNUNET_YES;
if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
}
plugin->server_v4_task = server_schedule (plugin, plugin->server_v4, now);
}
if ((server == plugin->server_v6) && (plugin->server_v6 != NULL))
{
if (GNUNET_YES == plugin->server_v6_immediately)
return; /* No rescheduling, server will run asap */
if (GNUNET_YES == now)
plugin->server_v6_immediately = GNUNET_YES;
if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
}
plugin->server_v6_task = server_schedule (plugin, plugin->server_v6, now);
}
}
/**
* Disconnect session @a s
*
* @param cls closure with the `struct HTTP_Server_Plugin`
* @param s the session
* @return #GNUNET_OK on success
*/
static int
http_server_plugin_disconnect_session (void *cls,
struct Session *s)
{
struct HTTP_Server_Plugin *plugin = cls;
struct ServerConnection * send;
struct ServerConnection * recv;
if (GNUNET_NO == server_exist_session (plugin, s))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
send = (struct ServerConnection *) s->server_send;
if (s->server_send != NULL)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name,
"Server: %p / %p Terminating inbound PUT session to peer `%s'\n",
s, s->server_send, GNUNET_i2s (&s->target));
send->disconnect = GNUNET_YES;
MHD_set_connection_option (send->mhd_conn,
MHD_CONNECTION_OPTION_TIMEOUT,
1);
server_reschedule (s->plugin, send->mhd_daemon, GNUNET_YES);
}
recv = (struct ServerConnection *) s->server_recv;
if (recv != NULL)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name,
"Server: %p / %p Terminating inbound GET session to peer `%s'\n",
s, s->server_recv, GNUNET_i2s (&s->target));
recv->disconnect = GNUNET_YES;
MHD_set_connection_option (recv->mhd_conn,
MHD_CONNECTION_OPTION_TIMEOUT,
1);
server_reschedule (s->plugin, recv->mhd_daemon, GNUNET_YES);
}
return GNUNET_OK;
}
/**
* Function that is called to get the keepalive factor.
* GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
* calculate the interval between keepalive packets.
*
* @param cls closure with the `struct Plugin`
* @return keepalive factor
*/
static unsigned int
http_server_query_keepalive_factor (void *cls)
{
return 3;
}
static void
http_server_plugin_update_session_timeout (void *cls,
const struct GNUNET_PeerIdentity *peer,
struct Session *session)
{
struct HTTP_Server_Plugin *plugin = cls;
if (GNUNET_NO == server_exist_session (plugin, session))
return;
server_reschedule_session_timeout (session);
}
/**
* Tell MHD that the connection should timeout after @a to seconds.
*
* @param plugin our plugin
* @param s session for which the timeout changes
* @param to timeout in seconds
*/
static void
server_mhd_connection_timeout (struct HTTP_Server_Plugin *plugin,
struct Session *s,
unsigned int to)
{
/* Setting timeouts for other connections */
if (NULL != s->server_recv)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Setting timeout for %p to %u sec.\n",
s->server_recv, to);
MHD_set_connection_option (s->server_recv->mhd_conn,
MHD_CONNECTION_OPTION_TIMEOUT,
to);
server_reschedule (plugin, s->server_recv->mhd_daemon, GNUNET_NO);
}
if (NULL != s->server_send)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Setting timeout for %p to %u sec.\n",
s->server_send, to);
MHD_set_connection_option (s->server_send->mhd_conn,
MHD_CONNECTION_OPTION_TIMEOUT,
to);
server_reschedule (plugin, s->server_send->mhd_daemon, GNUNET_NO);
}
}
/**
* Parse incoming URL for tag and target
*
* @param plugin plugin
* @param url incoming url
* @param target where to store the target
* @param tag where to store the tag
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
static int
server_parse_url (struct HTTP_Server_Plugin *plugin,
const char *url,
struct GNUNET_PeerIdentity *target,
uint32_t *tag)
{
char * tag_start = NULL;
char * tag_end = NULL;
char * target_start = NULL;
char * separator = NULL;
unsigned int hash_length;
unsigned long int ctag;
/* URL parsing
* URL is valid if it is in the form [prefix with (multiple) '/'][peerid[103];tag]*/
if (NULL == url)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
/* convert tag */
/* find separator */
separator = strrchr (url, ';');
if (NULL == separator)
{
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
tag_start = separator + 1;
if (strlen (tag_start) == 0)
{
/* No tag after separator */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
ctag = strtoul (tag_start, &tag_end, 10);
if (ctag == 0)
{
/* tag == 0 , invalid */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
if ((ctag == ULONG_MAX) && (ERANGE == errno))
{
/* out of range: > ULONG_MAX */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
if (ctag > UINT32_MAX)
{
/* out of range: > UINT32_MAX */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
(*tag) = (uint32_t) ctag;
if (NULL == tag_end)
{
/* no char after tag */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
if (url[strlen(url)] != tag_end[0])
{
/* there are more not converted chars after tag */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
if (DEBUG_URL_PARSE)
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Found tag `%u' in url\n", (*tag));
/* convert peer id */
target_start = strrchr (url, '/');
if (NULL == target_start)
{
/* no leading '/' */
target_start = (char *) url;
}
target_start++;
hash_length = separator - target_start;
if (hash_length != plugin->peer_id_length)
{
/* no char after tag */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CRYPTO_eddsa_public_key_from_string (target_start,
hash_length,
&target->public_key))
{
/* hash conversion failed */
if (DEBUG_URL_PARSE) GNUNET_break (0);
return GNUNET_SYSERR;
}
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
plugin->name,
"Found target `%s' in URL\n",
GNUNET_i2s_full (target));
return GNUNET_OK;
}
/**
* Lookup a mhd connection and create one if none is found
*
* @param plugin the plugin handle
* @param mhd_connection the incoming mhd_connection
* @param url incoming requested URL
* @param method PUT or GET
* @return the server connecetion
*/
static struct ServerConnection *
server_lookup_connection (struct HTTP_Server_Plugin *plugin,
struct MHD_Connection *mhd_connection, const char *url,
const char *method)
{
struct Session *s = NULL;
struct ServerConnection *sc = NULL;
const union MHD_ConnectionInfo *conn_info;
struct GNUNET_ATS_Information ats;
struct HttpAddress *addr;
size_t addr_len;
struct GNUNET_PeerIdentity target;
uint32_t tag = 0;
int direction = GNUNET_SYSERR;
unsigned int to;
conn_info = MHD_get_connection_info (mhd_connection,
MHD_CONNECTION_INFO_CLIENT_ADDRESS);
if ((conn_info->client_addr->sa_family != AF_INET) &&
(conn_info->client_addr->sa_family != AF_INET6))
return NULL;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"New %s connection from %s\n", method, url);
if (GNUNET_SYSERR == server_parse_url (plugin, url, &target, &tag))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Invalid url %s\n", url);
return NULL;
}
if (0 == strcmp (MHD_HTTP_METHOD_PUT, method))
direction = _RECEIVE;
else if (0 == strcmp (MHD_HTTP_METHOD_GET, method))
direction = _SEND;
else
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Invalid method %s connection from %s\n", method, url);
return NULL;
}
plugin->cur_connections++;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"New %s connection from %s with tag %u (%u of %u)\n",
method,
GNUNET_i2s (&target), tag,
plugin->cur_connections, plugin->max_connections);
/* find duplicate session */
s = plugin->head;
while (s != NULL)
{
if ((0 == memcmp (&s->target, &target, sizeof (struct GNUNET_PeerIdentity))) &&
(s->tag == tag))
break;
s = s->next;
}
if (s != NULL)
{
if ((_RECEIVE == direction) && (NULL != s->server_recv))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Duplicate PUT connection from `%s' tag %u, dismissing new connection\n",
GNUNET_i2s (&target),
tag);
return NULL;
}
if ((_SEND == direction) && (NULL != s->server_send))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Duplicate GET connection from `%s' tag %u, dismissing new connection\n",
GNUNET_i2s (&target),
tag);
return NULL;
}
}
else
{
/* create new session */
switch (conn_info->client_addr->sa_family)
{
case (AF_INET):
addr = http_common_address_from_socket (plugin->protocol, conn_info->client_addr, sizeof (struct sockaddr_in));
addr_len = http_common_address_get_size (addr);
ats = plugin->env->get_address_type (plugin->env->cls, conn_info->client_addr, sizeof (struct sockaddr_in));
break;
case (AF_INET6):
addr = http_common_address_from_socket (plugin->protocol, conn_info->client_addr, sizeof (struct sockaddr_in6));
addr_len = http_common_address_get_size (addr);
ats = plugin->env->get_address_type (plugin->env->cls, conn_info->client_addr, sizeof (struct sockaddr_in6));
break;
default:
/* external host name */
ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
ats.type = htonl (GNUNET_ATS_NET_WAN);
return NULL;
}
s = GNUNET_new (struct Session);
memcpy (&s->target, &target, sizeof (struct GNUNET_PeerIdentity));
s->plugin = plugin;
s->addr = addr;
s->addrlen = addr_len;
s->ats_address_network_type = ats.value;
s->next_receive = GNUNET_TIME_UNIT_ZERO_ABS;
s->tag = tag;
s->server_recv = NULL;
s->server_send = NULL;
s->session_passed = GNUNET_NO;
s->session_ended = GNUNET_NO;
s->connect_in_progress = GNUNET_YES;
server_start_session_timeout(s);
GNUNET_CONTAINER_DLL_insert (plugin->head, plugin->tail, s);
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Creating new session %p for peer `%s' connecting from `%s'\n",
s, GNUNET_i2s (&target),
http_common_plugin_address_to_string (NULL,
plugin->protocol,
addr, addr_len));
}
sc = GNUNET_new (struct ServerConnection);
if (conn_info->client_addr->sa_family == AF_INET)
sc->mhd_daemon = plugin->server_v4;
if (conn_info->client_addr->sa_family == AF_INET6)
sc->mhd_daemon = plugin->server_v6;
sc->mhd_conn = mhd_connection;
sc->direction = direction;
sc->connected = GNUNET_NO;
sc->session = s;
if (direction == _SEND)
s->server_send = sc;
if (direction == _RECEIVE)
s->server_recv = sc;
if ((NULL != s->server_send) && (NULL != s->server_recv))
{
s->connect_in_progress = GNUNET_NO; /* PUT and GET are connected */
plugin->env->session_start (NULL, &s->target, PLUGIN_NAME, NULL, 0 ,s, NULL, 0);
}
if ((NULL == s->server_recv) || (NULL == s->server_send))
{
to = (HTTP_SERVER_NOT_VALIDATED_TIMEOUT.rel_value_us / 1000LL / 1000LL);
MHD_set_connection_option (mhd_connection,
MHD_CONNECTION_OPTION_TIMEOUT, to);
server_reschedule (plugin, sc->mhd_daemon, GNUNET_NO);
}
else
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Session %p for peer `%s' fully connected\n",
s, GNUNET_i2s (&target));
to = (HTTP_SERVER_SESSION_TIMEOUT.rel_value_us / 1000LL / 1000LL);
server_mhd_connection_timeout (plugin, s, to);
}
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Setting timeout for %p to %u sec.\n", sc, to);
return sc;
}
/**
* Lookup a session for a server connection
*
* @param plugin the plugin
* @param sc the server connection
* @return the session found or NULL
*/
static struct Session *
server_lookup_session (struct HTTP_Server_Plugin *plugin,
struct ServerConnection * sc)
{
struct Session *s;
for (s = plugin->head; NULL != s; s = s->next)
if ((s->server_recv == sc) || (s->server_send == sc))
return s;
return NULL;
}
static int
server_exist_session (struct HTTP_Server_Plugin *plugin,
struct Session *s)
{
struct Session * head;
for (head = plugin->head; head != NULL; head = head->next)
if (head == s)
return GNUNET_YES;
return GNUNET_NO;
}
/**
* Callback called by MHD when it needs data to send
*
* @param cls current session
* @param pos position in buffer
* @param buf the buffer to write data to
* @param max max number of bytes available in buffer
* @return bytes written to buffer
*/
static ssize_t
server_send_callback (void *cls, uint64_t pos, char *buf, size_t max)
{
struct Session *s = cls;
ssize_t bytes_read = 0;
struct HTTP_Message *msg;
char *stat_txt;
if (GNUNET_NO == server_exist_session (s->plugin, s))
return 0;
msg = s->msg_head;
if (NULL != msg)
{
/* sending */
bytes_read = GNUNET_MIN (msg->size - msg->pos,
max);
memcpy (buf, &msg->buf[msg->pos], bytes_read);
msg->pos += bytes_read;
/* removing message */
if (msg->pos == msg->size)
{
GNUNET_CONTAINER_DLL_remove (s->msg_head, s->msg_tail, msg);
if (NULL != msg->transmit_cont)
msg->transmit_cont (msg->transmit_cont_cls, &s->target, GNUNET_OK,
msg->size, msg->size + msg->overhead);
GNUNET_free (msg);
}
}
if (0 < bytes_read)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, s->plugin->name,
"Sent %u bytes to peer `%s' with session %p \n", bytes_read, GNUNET_i2s (&s->target), s);
GNUNET_asprintf (&stat_txt, "# bytes currently in %s_server buffers",
s->plugin->protocol);
GNUNET_STATISTICS_update (s->plugin->env->stats,
stat_txt, -bytes_read, GNUNET_NO);
GNUNET_free (stat_txt);
GNUNET_asprintf (&stat_txt, "# bytes transmitted via %s_server",
s->plugin->protocol);
GNUNET_STATISTICS_update (s->plugin->env->stats,
stat_txt, bytes_read, GNUNET_NO);
GNUNET_free (stat_txt);
}
return bytes_read;
}
/**
* Callback called by MessageStreamTokenizer when a message has arrived
*
* @param cls current session as closure
* @param client client
* @param message the message to be forwarded to transport service
* @return #GNUNET_OK
*/
static int
server_receive_mst_cb (void *cls, void *client,
const struct GNUNET_MessageHeader *message)
{
struct Session *s = cls;
struct HTTP_Server_Plugin *plugin = s->plugin;
struct GNUNET_ATS_Information atsi;
struct GNUNET_TIME_Relative delay;
char *stat_txt;
if (GNUNET_NO == server_exist_session (s->plugin, s))
return GNUNET_OK;
atsi.type = htonl (GNUNET_ATS_NETWORK_TYPE);
atsi.value = s->ats_address_network_type;
GNUNET_break (s->ats_address_network_type != ntohl (GNUNET_ATS_NET_UNSPECIFIED));
delay = plugin->env->receive (plugin->env->cls,
&s->target,
message,
s, NULL, 0);
plugin->env->update_address_metrics (plugin->env->cls,
&s->target,
NULL, 0, s, &atsi, 1);
GNUNET_asprintf (&stat_txt, "# bytes received via %s_server", plugin->protocol);
GNUNET_STATISTICS_update (plugin->env->stats,
stat_txt, ntohs (message->size), GNUNET_NO);
GNUNET_free (stat_txt);
s->session_passed = GNUNET_YES;
s->next_receive = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), delay);
if (delay.rel_value_us > 0)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Peer `%s' address `%s' next read delayed for %s\n",
GNUNET_i2s (&s->target),
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr, s->addrlen),
GNUNET_STRINGS_relative_time_to_string (delay,
GNUNET_YES));
}
server_reschedule_session_timeout (s);
return GNUNET_OK;
}
/**
* MHD callback for a new incoming connection
*
* @param cls the plugin handle
* @param mhd_connection the mhd connection
* @param url the requested URL
* @param method GET or PUT
* @param version HTTP version
* @param upload_data upload data
* @param upload_data_size sizeof upload data
* @param httpSessionCache the session cache to remember the connection
* @return MHD_YES if connection is accepted, MHD_NO on reject
*/
static int
server_access_cb (void *cls, struct MHD_Connection *mhd_connection,
const char *url, const char *method, const char *version,
const char *upload_data, size_t * upload_data_size,
void **httpSessionCache)
{
struct HTTP_Server_Plugin *plugin = cls;
int res = MHD_YES;
struct ServerConnection *sc = *httpSessionCache;
struct Session *s;
struct MHD_Response *response;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Access from connection %p (%u of %u) for `%s' `%s' url `%s' with upload data size %u\n"),
sc,
plugin->cur_connections, plugin->max_connections,
method, version, url, (*upload_data_size));
GNUNET_assert (cls != NULL);
if (sc == NULL)
{
/* new connection */
sc = server_lookup_connection (plugin, mhd_connection, url, method);
if (sc != NULL)
{
(*httpSessionCache) = sc;
}
else
{
response = MHD_create_response_from_data (strlen (HTTP_ERROR_RESPONSE), HTTP_ERROR_RESPONSE, MHD_NO, MHD_NO);
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONTENT_TYPE,
"text/html");
res = MHD_queue_response (mhd_connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response (response);
return res;
}
}
else
{
/* 'old' connection */
if (NULL == server_lookup_session (plugin, sc))
{
/* Session was already disconnected */
return MHD_NO;
}
}
/* existing connection */
sc = (*httpSessionCache);
s = sc->session;
GNUNET_assert (NULL != s);
/* connection is to be disconnected */
if (sc->disconnect == GNUNET_YES)
{
/* Sent HTTP/1.1: 200 OK as response */
response = MHD_create_response_from_data (strlen ("Thank you!"),
"Thank you!",
MHD_NO, MHD_NO);
MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
MHD_destroy_response (response);
return MHD_YES;
}
GNUNET_assert (s != NULL);
if (sc->direction == _SEND)
{
response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
32 * 1024,
&server_send_callback, s,
NULL);
MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
MHD_destroy_response (response);
return MHD_YES;
}
if (sc->direction == _RECEIVE)
{
if ((*upload_data_size == 0) && (sc->connected == GNUNET_NO))
{
/* (*upload_data_size == 0) first callback when header are passed */
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Session %p / Connection %p: Peer `%s' PUT on address `%s' connected\n",
s, sc,
GNUNET_i2s (&s->target),
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr,
s->addrlen));
sc->connected = GNUNET_YES;
return MHD_YES;
}
else if ((*upload_data_size == 0) && (sc->connected == GNUNET_YES))
{
/* (*upload_data_size == 0) when upload is complete */
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Session %p / Connection %p: Peer `%s' PUT on address `%s' finished upload\n",
s, sc,
GNUNET_i2s (&s->target),
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr,
s->addrlen));
sc->connected = GNUNET_NO;
/* Sent HTTP/1.1: 200 OK as PUT Response\ */
response = MHD_create_response_from_data (strlen ("Thank you!"),
"Thank you!",
MHD_NO, MHD_NO);
MHD_queue_response (mhd_connection, MHD_HTTP_OK, response);
MHD_destroy_response (response);
return MHD_YES;
}
else if ((*upload_data_size > 0) && (sc->connected == GNUNET_YES))
{
/* (*upload_data_size > 0) for every segment received */
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Session %p / Connection %p: Peer `%s' PUT on address `%s' received %u bytes\n",
s, sc,
GNUNET_i2s (&s->target),
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr,
s->addrlen),
*upload_data_size);
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
if ((s->next_receive.abs_value_us <= now.abs_value_us))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"PUT with %u bytes forwarded to MST\n",
*upload_data_size);
if (s->msg_tk == NULL)
{
s->msg_tk = GNUNET_SERVER_mst_create (&server_receive_mst_cb, s);
}
GNUNET_SERVER_mst_receive (s->msg_tk, s, upload_data,
*upload_data_size, GNUNET_NO, GNUNET_NO);
server_mhd_connection_timeout (plugin, s,
GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us / 1000LL / 1000LL);
(*upload_data_size) = 0;
}
else
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Session %p / Connection %p: no inbound bandwidth available! Next read was delayed by %s\n",
s, sc,
GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (s->next_receive),
GNUNET_YES));
}
return MHD_YES;
}
else
{
GNUNET_break (0);
return MHD_NO;
}
}
return res;
}
/**
* Callback from MHD when a connection disconnects
*
* @param cls closure with the `struct HTTP_Server_Plugin *`
* @param connection the disconnected MHD connection
* @param httpSessionCache the pointer to distinguish
*/
static void
server_disconnect_cb (void *cls, struct MHD_Connection *connection,
void **httpSessionCache)
{
struct HTTP_Server_Plugin *plugin = cls;
struct ServerConnection *sc = *httpSessionCache;
struct Session *s = NULL;
struct Session *t = NULL;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
plugin->name,
"Disconnect for connection %p \n", sc);
if (sc == NULL)
return;
if (NULL == (s = server_lookup_session (plugin, sc)))
return;
for (t = plugin->head; t != NULL; t = t->next)
if (t == s)
break;
if (NULL == t)
return;
if (sc->direction == _SEND)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Peer `%s' connection %p, GET on address `%s' disconnected\n",
GNUNET_i2s (&s->target), s->server_send,
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr, s->addrlen));
s->server_send = NULL;
if (NULL != (s->server_recv))
{
s->server_recv->disconnect = GNUNET_YES;
GNUNET_assert (NULL != s->server_recv->mhd_conn);
#if MHD_VERSION >= 0x00090E00
MHD_set_connection_option (s->server_recv->mhd_conn, MHD_CONNECTION_OPTION_TIMEOUT,
1);
#endif
server_reschedule (plugin, s->server_recv->mhd_daemon, GNUNET_NO);
}
}
if (sc->direction == _RECEIVE)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Peer `%s' connection %p PUT on address `%s' disconnected\n",
GNUNET_i2s (&s->target), s->server_recv,
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr, s->addrlen));
s->server_recv = NULL;
/* Do not terminate session when PUT disconnects
if (NULL != (s->server_send))
{
s->server_send->disconnect = GNUNET_YES;
GNUNET_assert (NULL != s->server_send->mhd_conn);
#if MHD_VERSION >= 0x00090E00
MHD_set_connection_option (s->server_send->mhd_conn, MHD_CONNECTION_OPTION_TIMEOUT,
1);
#endif
server_reschedule (plugin, s->server_send->mhd_daemon, GNUNET_NO);
}*/
if (s->msg_tk != NULL)
{
GNUNET_SERVER_mst_destroy (s->msg_tk);
s->msg_tk = NULL;
}
}
GNUNET_free (sc);
plugin->cur_connections--;
if ((s->server_send == NULL) && (s->server_recv == NULL))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Peer `%s' on address `%s' disconnected\n",
GNUNET_i2s (&s->target),
http_common_plugin_address_to_string (NULL,
plugin->protocol,
s->addr, s->addrlen));
if ((GNUNET_YES == s->session_passed) && (GNUNET_NO == s->session_ended))
{
/* Notify transport immediately that this session is invalid */
s->session_ended = GNUNET_YES;
plugin->env->session_end (plugin->env->cls, &s->target, s);
}
server_delete_session (plugin, s);
}
}
/**
* Check if incoming connection is accepted.
*
* @param cls plugin as closure
* @param addr address of incoming connection
* @param addr_len address length of incoming connection
* @return MHD_YES if connection is accepted, MHD_NO if connection is rejected
*/
static int
server_accept_cb (void *cls, const struct sockaddr *addr, socklen_t addr_len)
{
struct HTTP_Server_Plugin *plugin = cls;
if (plugin->cur_connections <= plugin->max_connections)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Accepting connection (%u of %u) from `%s'\n"),
plugin->cur_connections, plugin->max_connections,
GNUNET_a2s (addr, addr_len));
return MHD_YES;
}
else
{
GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, plugin->name,
_("Server reached maximum number connections (%u), rejecting new connection\n"),
plugin->max_connections);
return MHD_NO;
}
}
static void
server_log (void *arg, const char *fmt, va_list ap)
{
char text[1024];
vsnprintf (text, sizeof (text), fmt, ap);
va_end (ap);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Server: %s\n", text);
}
/**
* Call MHD IPv4 to process pending requests and then go back
* and schedule the next run.
* @param cls plugin as closure
* @param tc task context
*/
static void
server_v4_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct HTTP_Server_Plugin *plugin = cls;
GNUNET_assert (cls != NULL);
plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
#if 0
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Running IPv4 server\n");
#endif
plugin->server_v4_immediately = GNUNET_NO;
GNUNET_assert (MHD_YES == MHD_run (plugin->server_v4));
server_reschedule (plugin, plugin->server_v4, GNUNET_NO);
}
/**
* Call MHD IPv6 to process pending requests and then go back
* and schedule the next run.
* @param cls plugin as closure
* @param tc task context
*/
static void
server_v6_run (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct HTTP_Server_Plugin *plugin = cls;
GNUNET_assert (cls != NULL);
plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
#if 0
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Running IPv6 server\n");
#endif
plugin->server_v6_immediately = GNUNET_NO;
GNUNET_assert (MHD_YES == MHD_run (plugin->server_v6));
server_reschedule (plugin, plugin->server_v6, GNUNET_NO);
}
/**
* Function that queries MHD's select sets and
* starts the task waiting for them.
*
* @param plugin plugin
* @param daemon_handle the MHD daemon handle
* @return gnunet task identifier
*/
static GNUNET_SCHEDULER_TaskIdentifier
server_schedule (struct HTTP_Server_Plugin *plugin,
struct MHD_Daemon *daemon_handle,
int now)
{
GNUNET_SCHEDULER_TaskIdentifier ret;
fd_set rs;
fd_set ws;
fd_set es;
struct GNUNET_NETWORK_FDSet *wrs;
struct GNUNET_NETWORK_FDSet *wws;
struct GNUNET_NETWORK_FDSet *wes;
int max;
MHD_UNSIGNED_LONG_LONG timeout;
static unsigned long long last_timeout = 0;
int haveto;
struct GNUNET_TIME_Relative tv;
if (GNUNET_YES == plugin->in_shutdown)
return GNUNET_SCHEDULER_NO_TASK;
ret = GNUNET_SCHEDULER_NO_TASK;
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
wrs = GNUNET_NETWORK_fdset_create ();
wes = GNUNET_NETWORK_fdset_create ();
wws = GNUNET_NETWORK_fdset_create ();
max = -1;
GNUNET_assert (MHD_YES == MHD_get_fdset (daemon_handle, &rs, &ws, &es, &max));
haveto = MHD_get_timeout (daemon_handle, &timeout);
if (haveto == MHD_YES)
{
if (timeout != last_timeout)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"SELECT Timeout changed from %llu to %llu (ms)\n",
last_timeout, timeout);
last_timeout = timeout;
}
if (timeout <= GNUNET_TIME_UNIT_SECONDS.rel_value_us / 1000LL)
tv.rel_value_us = (uint64_t) timeout * 1000LL;
else
tv = GNUNET_TIME_UNIT_SECONDS;
}
else
tv = GNUNET_TIME_UNIT_SECONDS;
/* Force immediate run, since we have outbound data to send */
if (now == GNUNET_YES)
tv = GNUNET_TIME_UNIT_MILLISECONDS;
GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
GNUNET_NETWORK_fdset_copy_native (wes, &es, max + 1);
if (daemon_handle == plugin->server_v4)
{
if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
}
#if 0
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Scheduling IPv4 server task in %llu ms\n", tv);
#endif
ret =
GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
tv, wrs, wws,
&server_v4_run, plugin);
}
if (daemon_handle == plugin->server_v6)
{
if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
}
#if 0
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Scheduling IPv6 server task in %llu ms\n", tv);
#endif
ret =
GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
tv, wrs, wws,
&server_v6_run, plugin);
}
GNUNET_NETWORK_fdset_destroy (wrs);
GNUNET_NETWORK_fdset_destroy (wws);
GNUNET_NETWORK_fdset_destroy (wes);
return ret;
}
#if BUILD_HTTPS
/**
* Load ssl certificate from file
*
* @param file filename
* @return content of the file
*/
static char *
server_load_file (const char *file)
{
struct GNUNET_DISK_FileHandle *gn_file;
uint64_t fsize;
char *text = NULL;
if (GNUNET_OK != GNUNET_DISK_file_size (file,
&fsize, GNUNET_NO, GNUNET_YES))
return NULL;
text = GNUNET_malloc (fsize + 1);
gn_file =
GNUNET_DISK_file_open (file, GNUNET_DISK_OPEN_READ,
GNUNET_DISK_PERM_USER_READ);
if (gn_file == NULL)
{
GNUNET_free (text);
return NULL;
}
if (GNUNET_SYSERR == GNUNET_DISK_file_read (gn_file, text, fsize))
{
GNUNET_free (text);
GNUNET_DISK_file_close (gn_file);
return NULL;
}
text[fsize] = '\0';
GNUNET_DISK_file_close (gn_file);
return text;
}
#endif
#if BUILD_HTTPS
/**
* Load ssl certificate
*
* @param plugin the plugin
* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
*/
static int
server_load_certificate (struct HTTP_Server_Plugin *plugin)
{
int res = GNUNET_OK;
char *key_file;
char *cert_file;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg, plugin->name,
"KEY_FILE", &key_file))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
plugin->name, "CERT_FILE");
return GNUNET_SYSERR;
}
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (plugin->env->cfg, plugin->name,
"CERT_FILE", &cert_file))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
plugin->name, "CERT_FILE");
GNUNET_free (key_file);
return GNUNET_SYSERR;
}
/* Get crypto init string from config. If not present, use
* default values */
if (GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
plugin->name,
"CRYPTO_INIT",
&plugin->crypto_init))
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Using crypto init string `%s'\n",
plugin->crypto_init);
else
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Using default crypto init string \n");
/* read key & certificates from file */
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Trying to loading TLS certificate from key-file `%s' cert-file`%s'\n",
key_file, cert_file);
plugin->key = server_load_file (key_file);
plugin->cert = server_load_file (cert_file);
if ((plugin->key == NULL) || (plugin->cert == NULL))
{
struct GNUNET_OS_Process *cert_creation;
GNUNET_free_non_null (plugin->key);
plugin->key = NULL;
GNUNET_free_non_null (plugin->cert);
plugin->cert = NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"No usable TLS certificate found, creating certificate\n");
errno = 0;
cert_creation =
GNUNET_OS_start_process (GNUNET_NO, GNUNET_OS_INHERIT_STD_OUT_AND_ERR, NULL, NULL,
"gnunet-transport-certificate-creation",
"gnunet-transport-certificate-creation",
key_file, cert_file, NULL);
if (cert_creation == NULL)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
_
("Could not create a new TLS certificate, program `gnunet-transport-certificate-creation' could not be started!\n"));
GNUNET_free (key_file);
GNUNET_free (cert_file);
GNUNET_free_non_null (plugin->key);
plugin->key = NULL;
GNUNET_free_non_null (plugin->cert);
plugin->cert = NULL;
GNUNET_free_non_null (plugin->crypto_init);
plugin->crypto_init = NULL;
return GNUNET_SYSERR;
}
GNUNET_assert (GNUNET_OK == GNUNET_OS_process_wait (cert_creation));
GNUNET_OS_process_destroy (cert_creation);
plugin->key = server_load_file (key_file);
plugin->cert = server_load_file (cert_file);
}
if ((plugin->key == NULL) || (plugin->cert == NULL))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
plugin->name,
_("No usable TLS certificate found and creating one at `%s/%s' failed!\n"),
key_file, cert_file);
GNUNET_free (key_file);
GNUNET_free (cert_file);
GNUNET_free_non_null (plugin->key);
plugin->key = NULL;
GNUNET_free_non_null (plugin->cert);
plugin->cert = NULL;
GNUNET_free_non_null (plugin->crypto_init);
plugin->crypto_init = NULL;
return GNUNET_SYSERR;
}
GNUNET_free (key_file);
GNUNET_free (cert_file);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TLS certificate loaded\n");
return res;
}
#endif
/**
* Start the HTTP server
*
* @param plugin the plugin handle
* @return GNUNET_OK on success, GNUNET_SYSERR on failure
*/
static int
server_start (struct HTTP_Server_Plugin *plugin)
{
unsigned int timeout;
char *msg;
GNUNET_assert (NULL != plugin);
#if BUILD_HTTPS
if (GNUNET_SYSERR == server_load_certificate (plugin))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
"Could not load or create server certificate! Loading plugin failed!\n");
return GNUNET_SYSERR;
}
#endif
#if MHD_VERSION >= 0x00090E00
timeout = HTTP_SERVER_NOT_VALIDATED_TIMEOUT.rel_value_us / 1000LL / 1000LL;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"MHD can set timeout per connection! Default time out %u sec.\n",
timeout);
#else
timeout = HTTP_SERVER_SESSION_TIMEOUT.rel_value_us / 1000LL / 1000LL;
GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, plugin->name,
"MHD cannot set timeout per connection! Default time out %u sec.\n",
timeout);
#endif
plugin->server_v4 = NULL;
if (plugin->use_ipv4 == GNUNET_YES)
{
plugin->server_v4 = MHD_start_daemon (
#if VERBOSE_SERVER
MHD_USE_DEBUG |
#endif
#if BUILD_HTTPS
MHD_USE_SSL |
#endif
MHD_NO_FLAG, plugin->port,
&server_accept_cb, plugin,
&server_access_cb, plugin,
MHD_OPTION_SOCK_ADDR,
(struct sockaddr_in *)
plugin->server_addr_v4,
MHD_OPTION_CONNECTION_LIMIT,
(unsigned int)
plugin->max_connections,
#if BUILD_HTTPS
MHD_OPTION_HTTPS_PRIORITIES,
plugin->crypto_init,
MHD_OPTION_HTTPS_MEM_KEY,
plugin->key,
MHD_OPTION_HTTPS_MEM_CERT,
plugin->cert,
#endif
MHD_OPTION_CONNECTION_TIMEOUT,
timeout,
MHD_OPTION_CONNECTION_MEMORY_LIMIT,
(size_t) (2 *
GNUNET_SERVER_MAX_MESSAGE_SIZE),
MHD_OPTION_NOTIFY_COMPLETED,
&server_disconnect_cb, plugin,
MHD_OPTION_EXTERNAL_LOGGER,
server_log, NULL, MHD_OPTION_END);
if (plugin->server_v4 == NULL)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
"Failed to start %s IPv4 server component on port %u\n",
plugin->name, plugin->port);
}
else
server_reschedule (plugin, plugin->server_v4, GNUNET_NO);
}
plugin->server_v6 = NULL;
if (plugin->use_ipv6 == GNUNET_YES)
{
plugin->server_v6 = MHD_start_daemon (
#if VERBOSE_SERVER
MHD_USE_DEBUG |
#endif
#if BUILD_HTTPS
MHD_USE_SSL |
#endif
MHD_USE_IPv6, plugin->port,
&server_accept_cb, plugin,
&server_access_cb, plugin,
MHD_OPTION_SOCK_ADDR,
(struct sockaddr_in6 *)
plugin->server_addr_v6,
MHD_OPTION_CONNECTION_LIMIT,
(unsigned int)
plugin->max_connections,
#if BUILD_HTTPS
MHD_OPTION_HTTPS_PRIORITIES,
plugin->crypto_init,
MHD_OPTION_HTTPS_MEM_KEY,
plugin->key,
MHD_OPTION_HTTPS_MEM_CERT,
plugin->cert,
#endif
MHD_OPTION_CONNECTION_TIMEOUT,
timeout,
MHD_OPTION_CONNECTION_MEMORY_LIMIT,
(size_t) (2 *
GNUNET_SERVER_MAX_MESSAGE_SIZE),
MHD_OPTION_NOTIFY_COMPLETED,
&server_disconnect_cb, plugin,
MHD_OPTION_EXTERNAL_LOGGER,
server_log, NULL, MHD_OPTION_END);
if (plugin->server_v6 == NULL)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
"Failed to start %s IPv6 server component on port %u\n",
plugin->name, plugin->port);
}
else
server_reschedule (plugin, plugin->server_v6, GNUNET_NO);
}
msg = "No";
if ((plugin->server_v6 == NULL) && (plugin->server_v4 == NULL))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
"%s %s server component started on port %u\n",
msg, plugin->name, plugin->port);
sleep (10);
return GNUNET_SYSERR;
}
else if ((plugin->server_v6 != NULL) && (plugin->server_v4 != NULL))
msg = "IPv4 and IPv6";
else if (plugin->server_v6 != NULL)
msg = "IPv6";
else if (plugin->server_v4 != NULL)
msg = "IPv4";
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"%s %s server component started on port %u\n",
msg, plugin->name, plugin->port);
return GNUNET_OK;
}
void
server_stop (struct HTTP_Server_Plugin *plugin)
{
if (plugin->server_v4 != NULL)
{
MHD_stop_daemon (plugin->server_v4);
plugin->server_v4 = NULL;
}
if ( plugin->server_v6 != NULL)
{
MHD_stop_daemon (plugin->server_v6);
plugin->server_v6 = NULL;
}
if (plugin->server_v4_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_SCHEDULER_cancel (plugin->server_v4_task);
plugin->server_v4_task = GNUNET_SCHEDULER_NO_TASK;
}
if (plugin->server_v6_task != GNUNET_SCHEDULER_NO_TASK)
{
GNUNET_SCHEDULER_cancel (plugin->server_v6_task);
plugin->server_v6_task = GNUNET_SCHEDULER_NO_TASK;
}
#if BUILD_HTTPS
GNUNET_free_non_null (plugin->crypto_init);
GNUNET_free_non_null (plugin->cert);
GNUNET_free_non_null (plugin->key);
#endif
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"%s server component stopped\n", plugin->name);
}
/**
* Add an address to the server's set of addresses and notify transport
*
* @param cls the plugin handle
* @param add_remove GNUNET_YES on add, GNUNET_NO on remove
* @param addr the address
* @param addrlen address length
*/
static void
server_add_address (void *cls, int add_remove, const struct sockaddr *addr,
socklen_t addrlen)
{
struct HTTP_Server_Plugin *plugin = cls;
struct HttpAddressWrapper *w = NULL;
w = GNUNET_malloc (sizeof (struct HttpAddressWrapper));
w->address = http_common_address_from_socket (plugin->protocol, addr, addrlen);
if (NULL == w->address)
{
GNUNET_free (w);
return;
}
w->addrlen = http_common_address_get_size (w->address);
GNUNET_CONTAINER_DLL_insert(plugin->addr_head, plugin->addr_tail, w);
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Notifying transport to add address `%s'\n",
http_common_plugin_address_to_string (NULL,
plugin->protocol,
w->address, w->addrlen));
#if BUILD_HTTPS
plugin->env->notify_address (plugin->env->cls, add_remove, w->address, w->addrlen, "https_client");
#else
plugin->env->notify_address (plugin->env->cls, add_remove, w->address, w->addrlen, "http_client");
#endif
}
/**
* Remove an address from the server's set of addresses and notify transport
*
* @param cls the plugin handle
* @param add_remove GNUNET_YES on add, GNUNET_NO on remove
* @param addr the address
* @param addrlen address length
*/
static void
server_remove_address (void *cls, int add_remove, const struct sockaddr *addr,
socklen_t addrlen)
{
struct HTTP_Server_Plugin *plugin = cls;
struct HttpAddressWrapper *w = plugin->addr_head;
size_t saddr_len;
void * saddr = http_common_address_from_socket (plugin->protocol, addr, addrlen);
if (NULL == saddr)
return;
saddr_len = http_common_address_get_size (saddr);
while (NULL != w)
{
if (GNUNET_YES == http_common_cmp_addresses(w->address, w->addrlen, saddr, saddr_len))
break;
w = w->next;
}
GNUNET_free (saddr);
if (NULL == w)
return;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Notifying transport to remove address `%s'\n",
http_common_plugin_address_to_string (NULL,
plugin->protocol,
w->address, w->addrlen));
GNUNET_CONTAINER_DLL_remove (plugin->addr_head, plugin->addr_tail, w);
#if BUILD_HTTPS
plugin->env->notify_address (plugin->env->cls, add_remove, w->address, w->addrlen, "https_client");
#else
plugin->env->notify_address (plugin->env->cls, add_remove, w->address, w->addrlen, "http_client");
#endif
GNUNET_free (w->address);
GNUNET_free (w);
}
/**
* Our external IP address/port mapping has changed.
*
* @param cls closure, the 'struct LocalAddrList'
* @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
* the previous (now invalid) one
* @param addr either the previous or the new public IP address
* @param addrlen actual lenght of the address
*/
static void
server_nat_port_map_callback (void *cls, int add_remove, const struct sockaddr *addr,
socklen_t addrlen)
{
GNUNET_assert (cls != NULL);
struct HTTP_Server_Plugin *plugin = cls;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"NAT called to %s address `%s'\n",
(add_remove == GNUNET_NO) ? "remove" : "add",
GNUNET_a2s (addr, addrlen));
if (AF_INET == addr->sa_family)
{
struct sockaddr_in *s4 = (struct sockaddr_in *) addr;
if (GNUNET_NO == plugin->use_ipv4)
return;
if ((NULL != plugin->server_addr_v4) &&
(0 != memcmp (&plugin->server_addr_v4->sin_addr,
&s4->sin_addr, sizeof (struct in_addr))))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Skipping address `%s' (not bindto address)\n",
GNUNET_a2s (addr, addrlen));
return;
}
}
if (AF_INET6 == addr->sa_family)
{
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) addr;
if (GNUNET_NO == plugin->use_ipv6)
return;
if ((NULL != plugin->server_addr_v6) &&
(0 != memcmp (&plugin->server_addr_v6->sin6_addr,
&s6->sin6_addr, sizeof (struct in6_addr))))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Skipping address `%s' (not bindto address)\n",
GNUNET_a2s (addr, addrlen));
return;
}
}
switch (add_remove)
{
case GNUNET_YES:
server_add_address (cls, add_remove, addr, addrlen);
break;
case GNUNET_NO:
server_remove_address (cls, add_remove, addr, addrlen);
break;
}
}
/**
* Get valid server addresses
*
* @param plugin the plugin handle
* @param service_name the servicename
* @param cfg configuration handle
* @param addrs addresses
* @param addr_lens address length
* @return number of addresses
*/
static int
server_get_addresses (struct HTTP_Server_Plugin *plugin,
const char *service_name,
const struct GNUNET_CONFIGURATION_Handle *cfg,
struct sockaddr ***addrs, socklen_t ** addr_lens)
{
int disablev6;
unsigned long long port;
struct addrinfo hints;
struct addrinfo *res;
struct addrinfo *pos;
struct addrinfo *next;
unsigned int i;
int resi;
int ret;
struct sockaddr **saddrs;
socklen_t *saddrlens;
char *hostname;
*addrs = NULL;
*addr_lens = NULL;
disablev6 = !plugin->use_ipv6;
port = 0;
if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "PORT"))
{
GNUNET_break (GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_number (cfg, service_name,
"PORT", &port));
if (port > 65535)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_
("Require valid port number for service in configuration!\n"));
return GNUNET_SYSERR;
}
}
if (0 == port)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, plugin->name,
"Starting in listen only mode\n");
return -1; /* listen only */
}
if (GNUNET_CONFIGURATION_have_value (cfg, service_name, "BINDTO"))
{
GNUNET_break (GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_string (cfg, service_name,
"BINDTO", &hostname));
}
else
hostname = NULL;
if (hostname != NULL)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Resolving `%s' since that is where `%s' will bind to.\n",
hostname, service_name);
memset (&hints, 0, sizeof (struct addrinfo));
if (disablev6)
hints.ai_family = AF_INET;
if ((0 != (ret = getaddrinfo (hostname, NULL, &hints, &res))) ||
(res == NULL))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Failed to resolve `%s': %s\n"),
hostname, gai_strerror (ret));
GNUNET_free (hostname);
return GNUNET_SYSERR;
}
next = res;
i = 0;
while (NULL != (pos = next))
{
next = pos->ai_next;
if ((disablev6) && (pos->ai_family == AF_INET6))
continue;
i++;
}
if (0 == i)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to find %saddress for `%s'.\n"),
disablev6 ? "IPv4 " : "", hostname);
freeaddrinfo (res);
GNUNET_free (hostname);
return GNUNET_SYSERR;
}
resi = i;
saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
i = 0;
next = res;
while (NULL != (pos = next))
{
next = pos->ai_next;
if ((disablev6) && (pos->ai_family == AF_INET6))
continue;
if ((pos->ai_protocol != IPPROTO_TCP) && (pos->ai_protocol != 0))
continue; /* not TCP */
if ((pos->ai_socktype != SOCK_STREAM) && (pos->ai_socktype != 0))
continue; /* huh? */
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Service will bind to `%s'\n", GNUNET_a2s (pos->ai_addr,
pos->ai_addrlen));
if (pos->ai_family == AF_INET)
{
GNUNET_assert (pos->ai_addrlen == sizeof (struct sockaddr_in));
saddrlens[i] = pos->ai_addrlen;
saddrs[i] = GNUNET_malloc (saddrlens[i]);
memcpy (saddrs[i], pos->ai_addr, saddrlens[i]);
((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
}
else
{
GNUNET_assert (pos->ai_family == AF_INET6);
GNUNET_assert (pos->ai_addrlen == sizeof (struct sockaddr_in6));
saddrlens[i] = pos->ai_addrlen;
saddrs[i] = GNUNET_malloc (saddrlens[i]);
memcpy (saddrs[i], pos->ai_addr, saddrlens[i]);
((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port);
}
i++;
}
GNUNET_free (hostname);
freeaddrinfo (res);
resi = i;
}
else
{
/* will bind against everything, just set port */
if (disablev6)
{
/* V4-only */
resi = 1;
i = 0;
saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
saddrlens[i] = sizeof (struct sockaddr_in);
saddrs[i] = GNUNET_malloc (saddrlens[i]);
#if HAVE_SOCKADDR_IN_SIN_LEN
((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[i];
#endif
((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET;
((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
}
else
{
/* dual stack */
resi = 2;
saddrs = GNUNET_malloc ((resi + 1) * sizeof (struct sockaddr *));
saddrlens = GNUNET_malloc ((resi + 1) * sizeof (socklen_t));
i = 0;
saddrlens[i] = sizeof (struct sockaddr_in6);
saddrs[i] = GNUNET_malloc (saddrlens[i]);
#if HAVE_SOCKADDR_IN_SIN_LEN
((struct sockaddr_in6 *) saddrs[i])->sin6_len = saddrlens[0];
#endif
((struct sockaddr_in6 *) saddrs[i])->sin6_family = AF_INET6;
((struct sockaddr_in6 *) saddrs[i])->sin6_port = htons (port);
i++;
saddrlens[i] = sizeof (struct sockaddr_in);
saddrs[i] = GNUNET_malloc (saddrlens[i]);
#if HAVE_SOCKADDR_IN_SIN_LEN
((struct sockaddr_in *) saddrs[i])->sin_len = saddrlens[1];
#endif
((struct sockaddr_in *) saddrs[i])->sin_family = AF_INET;
((struct sockaddr_in *) saddrs[i])->sin_port = htons (port);
}
}
*addrs = saddrs;
*addr_lens = saddrlens;
return resi;
}
/**
* Ask NAT for addresses
*
* @param plugin the plugin handle
*/
static void
server_start_report_addresses (struct HTTP_Server_Plugin *plugin)
{
int res = GNUNET_OK;
struct sockaddr **addrs;
socklen_t *addrlens;
res = server_get_addresses (plugin,
plugin->name, plugin->env->cfg,
&addrs, &addrlens);
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Found %u addresses to report to NAT service\n"), res);
if (GNUNET_SYSERR == res)
{
plugin->nat = NULL;
return;
}
plugin->nat =
GNUNET_NAT_register (plugin->env->cfg, GNUNET_YES, plugin->port,
(unsigned int) res,
(const struct sockaddr **) addrs, addrlens,
&server_nat_port_map_callback, NULL, plugin);
while (res > 0)
{
res--;
GNUNET_assert (addrs[res] != NULL);
GNUNET_free (addrs[res]);
}
GNUNET_free_non_null (addrs);
GNUNET_free_non_null (addrlens);
}
/**
* Stop NAT for addresses
*
* @param plugin the plugin handle
*/
static void
server_stop_report_addresses (struct HTTP_Server_Plugin *plugin)
{
/* Stop NAT handle */
if (NULL != plugin->nat)
GNUNET_NAT_unregister (plugin->nat);
/* Clean up addresses */
struct HttpAddressWrapper *w;
while (plugin->addr_head != NULL)
{
w = plugin->addr_head;
GNUNET_CONTAINER_DLL_remove (plugin->addr_head, plugin->addr_tail, w);
GNUNET_free (w->address);
GNUNET_free (w);
}
}
/**
* Check if IPv6 supported on this system
*
* @param plugin the plugin handle
* @return GNUNET_YES on success, else GNUNET_NO
*/
static int
server_check_ipv6_support (struct HTTP_Server_Plugin *plugin)
{
struct GNUNET_NETWORK_Handle *desc = NULL;
int res = GNUNET_NO;
/* Probe IPv6 support */
desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_STREAM, 0);
if (NULL == desc)
{
if ((errno == ENOBUFS) || (errno == ENOMEM) || (errno == ENFILE) ||
(errno == EACCES))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "socket");
}
GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, plugin->name,
_
("Disabling IPv6 since it is not supported on this system!\n"));
res = GNUNET_NO;
}
else
{
GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (desc));
desc = NULL;
res = GNUNET_YES;
}
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Testing IPv6 on this system: %s\n",
(res == GNUNET_YES) ? "successful" : "failed");
return res;
}
/**
* Notify server about our external hostname
*
* @param cls plugin
* @param tc task context (unused)
*/
static void
server_notify_external_hostname (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct HTTP_Server_Plugin *plugin = cls;
unsigned int urlen;
char *url;
plugin->notify_ext_task = GNUNET_SCHEDULER_NO_TASK;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
GNUNET_asprintf(&url, "%s://%s", plugin->protocol, plugin->external_hostname);
urlen = strlen (url) + 1;
plugin->ext_addr = GNUNET_malloc (sizeof (struct HttpAddress) + urlen);
plugin->ext_addr->options = htonl(plugin->options);
plugin->ext_addr->urlen = htonl (urlen);
plugin->ext_addr_len = sizeof (struct HttpAddress) + urlen;
memcpy (&plugin->ext_addr[1], url, urlen);
GNUNET_free (url);
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Notifying transport about external hostname address `%s'\n", plugin->external_hostname);
#if BUILD_HTTPS
if (GNUNET_YES == plugin->verify_external_hostname)
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, plugin->name,
"Enabling SSL verification for external hostname address `%s'\n", plugin->external_hostname);
plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
plugin->ext_addr, plugin->ext_addr_len,
"https_client");
#else
plugin->env->notify_address (plugin->env->cls, GNUNET_YES,
plugin->ext_addr, plugin->ext_addr_len,
"http_client");
#endif
}
/**
* Configure the plugin
*
* @param plugin plugin handle
* @return GNUNET_OK on success, GNUNET_SYSERR on failure
*/
static int
server_configure_plugin (struct HTTP_Server_Plugin *plugin)
{
unsigned long long port;
unsigned long long max_connections;
char *bind4_address = NULL;
char *bind6_address = NULL;
char *eh_tmp = NULL;
int external_hostname_use_port;
/* Use IPv4? */
if (GNUNET_CONFIGURATION_have_value
(plugin->env->cfg, plugin->name, "USE_IPv4"))
{
plugin->use_ipv4 =
GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
"USE_IPv4");
}
else
plugin->use_ipv4 = GNUNET_YES;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("IPv4 support is %s\n"),
(plugin->use_ipv4 == GNUNET_YES) ? "enabled" : "disabled");
/* Use IPv6? */
if (GNUNET_CONFIGURATION_have_value
(plugin->env->cfg, plugin->name, "USE_IPv6"))
{
plugin->use_ipv6 =
GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
"USE_IPv6");
}
else
plugin->use_ipv6 = GNUNET_YES;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("IPv6 support is %s\n"),
(plugin->use_ipv6 == GNUNET_YES) ? "enabled" : "disabled");
if ((plugin->use_ipv4 == GNUNET_NO) && (plugin->use_ipv6 == GNUNET_NO))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
_
("Neither IPv4 nor IPv6 are enabled! Fix in configuration\n"),
plugin->name);
return GNUNET_SYSERR;
}
/* Reading port number from config file */
if ((GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg, plugin->name,
"PORT", &port)) || (port > 65535))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
_("Port is required! Fix in configuration\n"),
plugin->name);
return GNUNET_SYSERR;
}
plugin->port = port;
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, plugin->name,
_("Using port %u\n"), plugin->port);
if ((plugin->use_ipv4 == GNUNET_YES) &&
(GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg,
plugin->name, "BINDTO", &bind4_address)))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Binding %s plugin to specific IPv4 address: `%s'\n",
plugin->protocol, bind4_address);
plugin->server_addr_v4 = GNUNET_malloc (sizeof (struct sockaddr_in));
if (1 != inet_pton (AF_INET, bind4_address,
&plugin->server_addr_v4->sin_addr))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
_
("Specific IPv4 address `%s' in configuration file is invalid!\n"),
bind4_address);
GNUNET_free (bind4_address);
GNUNET_free (plugin->server_addr_v4);
plugin->server_addr_v4 = NULL;
return GNUNET_SYSERR;
}
else
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Binding to IPv4 address %s\n"), bind4_address);
plugin->server_addr_v4->sin_family = AF_INET;
plugin->server_addr_v4->sin_port = htons (plugin->port);
}
GNUNET_free (bind4_address);
}
if ((plugin->use_ipv6 == GNUNET_YES) &&
(GNUNET_YES ==
GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg, plugin->name,
"BINDTO6", &bind6_address)))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Binding %s plugin to specific IPv6 address: `%s'\n",
plugin->protocol, bind6_address);
plugin->server_addr_v6 = GNUNET_malloc (sizeof (struct sockaddr_in6));
if (1 !=
inet_pton (AF_INET6, bind6_address, &plugin->server_addr_v6->sin6_addr))
{
GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR, plugin->name,
_
("Specific IPv6 address `%s' in configuration file is invalid!\n"),
bind6_address);
GNUNET_free (bind6_address);
GNUNET_free (plugin->server_addr_v6);
plugin->server_addr_v6 = NULL;
return GNUNET_SYSERR;
}
else
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Binding to IPv6 address %s\n"), bind6_address);
plugin->server_addr_v6->sin6_family = AF_INET6;
plugin->server_addr_v6->sin6_port = htons (plugin->port);
}
GNUNET_free (bind6_address);
}
plugin->verify_external_hostname = GNUNET_NO;
#if BUILD_HTTPS
plugin->verify_external_hostname = GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
"VERIFY_EXTERNAL_HOSTNAME");
if (GNUNET_SYSERR == plugin->verify_external_hostname)
plugin->verify_external_hostname = GNUNET_NO;
if (GNUNET_YES == plugin->verify_external_hostname)
plugin->options |= HTTP_OPTIONS_VERIFY_CERTIFICATE;
#endif
external_hostname_use_port = GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
"EXTERNAL_HOSTNAME_USE_PORT");
if (GNUNET_SYSERR == external_hostname_use_port)
external_hostname_use_port = GNUNET_NO;
if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (plugin->env->cfg, plugin->name,
"EXTERNAL_HOSTNAME", &eh_tmp))
{
char * tmp = NULL;
char * pos = NULL;
char * pos_url = NULL;
if (NULL != strstr(eh_tmp, "://"))
{
tmp = &strstr(eh_tmp, "://")[3];
}
else
tmp = eh_tmp;
if (GNUNET_YES == external_hostname_use_port)
{
if ( (strlen (tmp) > 1) && (NULL != (pos = strchr(tmp, '/'))) )
{
pos_url = pos + 1;
pos[0] = '\0';
GNUNET_asprintf (&plugin->external_hostname, "%s:%u/%s", tmp, (uint16_t) port, (NULL == pos_url) ? "" : pos_url);
}
else
GNUNET_asprintf (&plugin->external_hostname, "%s:%u", tmp, (uint16_t) port);
}
else
plugin->external_hostname = GNUNET_strdup (tmp);
GNUNET_free (eh_tmp);
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, plugin->name,
_("Using external hostname `%s'\n"), plugin->external_hostname);
plugin->notify_ext_task = GNUNET_SCHEDULER_add_now (&server_notify_external_hostname, plugin);
/* Use only configured external hostname */
if (GNUNET_CONFIGURATION_have_value
(plugin->env->cfg, plugin->name, "EXTERNAL_HOSTNAME_ONLY"))
{
plugin->external_only =
GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, plugin->name,
"EXTERNAL_HOSTNAME_ONLY");
}
else
plugin->external_only = GNUNET_NO;
if (GNUNET_YES == plugin->external_only)
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Notifying transport only about hostname `%s'\n"), plugin->external_hostname);
}
else
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"No external hostname configured\n");
/* Optional parameters */
if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (plugin->env->cfg,
plugin->name,
"MAX_CONNECTIONS", &max_connections))
max_connections = 128;
plugin->max_connections = max_connections;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Maximum number of connections is %u\n"),
plugin->max_connections);
plugin->peer_id_length = strlen (GNUNET_i2s_full (plugin->env->my_identity));
return GNUNET_OK;
}
/**
* Session was idle, so disconnect it
*
* @param cls the session
* @param tc task context
*/
static void
server_session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct Session *s = cls;
s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
GNUNET_log (TIMEOUT_LOG,
"Session %p was idle for %s, disconnecting\n",
s,
GNUNET_STRINGS_relative_time_to_string (HTTP_SERVER_SESSION_TIMEOUT,
GNUNET_YES));
/* call session destroy function */
GNUNET_assert (GNUNET_OK ==
http_server_plugin_disconnect_session (s->plugin, s));
}
/**
* Start session timeout for session s
*
* @param s the session
*/
static void
server_start_session_timeout (struct Session *s)
{
GNUNET_assert (NULL != s);
GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
s->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_SERVER_SESSION_TIMEOUT,
&server_session_timeout,
s);
GNUNET_log (TIMEOUT_LOG,
"Timeout for session %p set to %s\n",
s,
GNUNET_STRINGS_relative_time_to_string (HTTP_SERVER_SESSION_TIMEOUT,
GNUNET_YES));
}
/**
* Increment session timeout due to activity session s
*
* @param s the session
*/
static void
server_reschedule_session_timeout (struct Session *s)
{
GNUNET_assert (NULL != s);
GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
GNUNET_SCHEDULER_cancel (s->timeout_task);
s->timeout_task = GNUNET_SCHEDULER_add_delayed (HTTP_SERVER_SESSION_TIMEOUT,
&server_session_timeout,
s);
GNUNET_log (TIMEOUT_LOG,
"Timeout rescheduled for session %p set to %s\n",
s,
GNUNET_STRINGS_relative_time_to_string (HTTP_SERVER_SESSION_TIMEOUT,
GNUNET_YES));
}
/**
* Exit point from the plugin.
*
* @param cls api
* @return NULL
*/
void *
LIBGNUNET_PLUGIN_TRANSPORT_DONE (void *cls)
{
struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
struct HTTP_Server_Plugin *plugin = api->cls;
struct Session *pos;
struct Session *next;
if (NULL == api->cls)
{
/* Free for stub mode */
GNUNET_free (api);
return NULL;
}
plugin->in_shutdown = GNUNET_YES;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Shutting down plugin `%s'\n"),
plugin->name);
if (GNUNET_SCHEDULER_NO_TASK != plugin->notify_ext_task)
{
GNUNET_SCHEDULER_cancel (plugin->notify_ext_task);
plugin->notify_ext_task = GNUNET_SCHEDULER_NO_TASK;
}
if (NULL != plugin->ext_addr)
{
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Notifying transport to remove address `%s'\n",
http_common_plugin_address_to_string (NULL,
plugin->protocol,
plugin->ext_addr,
plugin->ext_addr_len));
#if BUILD_HTTPS
plugin->env->notify_address (plugin->env->cls,
GNUNET_NO,
plugin->ext_addr,
plugin->ext_addr_len,
"https_client");
#else
plugin->env->notify_address (plugin->env->cls,
GNUNET_NO,
plugin->ext_addr,
plugin->ext_addr_len,
"http_client");
#endif
}
/* Stop to report addresses to transport service */
server_stop_report_addresses (plugin);
server_stop (plugin);
next = plugin->head;
while (NULL != (pos = next))
{
next = pos->next;
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
"Removing left over session %p\n", pos);
if ((GNUNET_YES == pos->session_passed) && (GNUNET_NO == pos->session_ended))
{
/* Notify transport immediately that this session is invalid */
pos->session_ended = GNUNET_YES;
plugin->env->session_end (plugin->env->cls, &pos->target, pos);
}
server_delete_session (plugin, pos);
}
/* Clean up */
GNUNET_free_non_null (plugin->external_hostname);
GNUNET_free_non_null (plugin->ext_addr);
GNUNET_free_non_null (plugin->server_addr_v4);
GNUNET_free_non_null (plugin->server_addr_v6);
GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, plugin->name,
_("Shutdown for plugin `%s' complete\n"),
plugin->name);
GNUNET_free (plugin);
GNUNET_free (api);
return NULL;
}
static const char *
http_plugin_address_to_string (void *cls,
const void *addr,
size_t addrlen)
{
#if BUILD_HTTPS
return http_common_plugin_address_to_string (cls, PLUGIN_NAME, addr, addrlen);
#else
return http_common_plugin_address_to_string (cls, PLUGIN_NAME, addr, addrlen);
#endif
}
/**
* Function obtain the network type for a session
*
* @param cls closure ('struct Plugin*')
* @param session the session
* @return the network type in HBO or GNUNET_SYSERR
*/
static enum GNUNET_ATS_Network_Type
http_server_get_network (void *cls,
struct Session *session)
{
GNUNET_assert (NULL != session);
return ntohl (session->ats_address_network_type);
}
/**
* Entry point for the plugin.
*
* @param cls env
* @return api
*/
void *
LIBGNUNET_PLUGIN_TRANSPORT_INIT (void *cls)
{
struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
struct GNUNET_TRANSPORT_PluginFunctions *api;
struct HTTP_Server_Plugin *plugin;
if (NULL == env->receive)
{
/* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
initialze the plugin or the API */
api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
api->cls = NULL;
api->address_to_string = &http_plugin_address_to_string;
api->string_to_address = &http_common_plugin_string_to_address;
api->address_pretty_printer = &http_common_plugin_address_pretty_printer;
return api;
}
plugin = GNUNET_new (struct HTTP_Server_Plugin);
plugin->env = env;
api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
api->cls = plugin;
api->send = &http_server_plugin_send;
api->disconnect_peer = &http_server_plugin_disconnect_peer;
api->disconnect_session = &http_server_plugin_disconnect_session;
api->query_keepalive_factor = &http_server_query_keepalive_factor;
api->check_address = &http_server_plugin_address_suggested;
api->get_session = &http_server_plugin_get_session;
api->address_to_string = &http_plugin_address_to_string;
api->string_to_address = &http_common_plugin_string_to_address;
api->address_pretty_printer = &http_common_plugin_address_pretty_printer;
api->get_network = &http_server_get_network;
api->update_session_timeout = &http_server_plugin_update_session_timeout;
#if BUILD_HTTPS
plugin->name = "transport-https_server";
plugin->protocol = "https";
#else
plugin->name = "transport-http_server";
plugin->protocol = "http";
#endif
/* Configure plugin */
if (GNUNET_SYSERR == server_configure_plugin (plugin))
{
LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
return NULL;
}
/* Check IPv6 support */
if (GNUNET_YES == plugin->use_ipv6)
plugin->use_ipv6 = server_check_ipv6_support (plugin);
/* Report addresses to transport service */
if (GNUNET_NO == plugin->external_only)
server_start_report_addresses (plugin);
if (GNUNET_SYSERR == server_start (plugin))
{
LIBGNUNET_PLUGIN_TRANSPORT_DONE (api);
return NULL;
}
return api;
}
/* end of plugin_transport_http_server.c */
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