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Diffstat (limited to 'src/transport/plugin_transport_udp.c')
| -rw-r--r-- | src/transport/plugin_transport_udp.c | 2297 |
1 files changed, 2297 insertions, 0 deletions
diff --git a/src/transport/plugin_transport_udp.c b/src/transport/plugin_transport_udp.c new file mode 100644 index 0000000..7141563 --- /dev/null +++ b/src/transport/plugin_transport_udp.c @@ -0,0 +1,2297 @@ +/* + This file is part of GNUnet + (C) 2010, 2011 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_udp.c + * @brief Implementation of the UDP transport protocol + * @author Christian Grothoff + * @author Nathan Evans + * @author Matthias Wachs + */ +#include "platform.h" +#include "plugin_transport_udp.h" +#include "gnunet_hello_lib.h" +#include "gnunet_util_lib.h" +#include "gnunet_fragmentation_lib.h" +#include "gnunet_nat_lib.h" +#include "gnunet_protocols.h" +#include "gnunet_resolver_service.h" +#include "gnunet_signatures.h" +#include "gnunet_constants.h" +#include "gnunet_statistics_service.h" +#include "gnunet_transport_service.h" +#include "gnunet_transport_plugin.h" +#include "transport.h" + +#define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__) + + +/** + * Number of messages we can defragment in parallel. We only really + * defragment 1 message at a time, but if messages get re-ordered, we + * may want to keep knowledge about the previous message to avoid + * discarding the current message in favor of a single fragment of a + * previous message. 3 should be good since we don't expect massive + * message reorderings with UDP. + */ +#define UDP_MAX_MESSAGES_IN_DEFRAG 3 + +/** + * We keep a defragmentation queue per sender address. How many + * sender addresses do we support at the same time? Memory consumption + * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this + * value. (So 128 corresponds to 12 MB and should suffice for + * connecting to roughly 128 peers via UDP). + */ +#define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128 + + + +/** + * Closure for 'append_port'. + */ +struct PrettyPrinterContext +{ + /** + * Function to call with the result. + */ + GNUNET_TRANSPORT_AddressStringCallback asc; + + /** + * Clsoure for 'asc'. + */ + void *asc_cls; + + /** + * Port to add after the IP address. + */ + uint16_t port; +}; + +struct Session +{ + /** + * Which peer is this session for? + */ + struct GNUNET_PeerIdentity target; + + /** + * Address of the other peer + */ + const struct sockaddr *sock_addr; + + size_t addrlen; + + /** + * Desired delay for next sending we send to other peer + */ + struct GNUNET_TIME_Relative flow_delay_for_other_peer; + + /** + * Desired delay for next sending we received from other peer + */ + struct GNUNET_TIME_Absolute flow_delay_from_other_peer; + + /** + * expected delay for ACKs + */ + struct GNUNET_TIME_Relative last_expected_delay; + + + struct GNUNET_ATS_Information ats; + + struct FragmentationContext * frag_ctx; +}; + + +struct SessionCompareContext +{ + struct Session *res; + const struct GNUNET_HELLO_Address *addr; +}; + + +/** + * Closure for 'process_inbound_tokenized_messages' + */ +struct SourceInformation +{ + /** + * Sender identity. + */ + struct GNUNET_PeerIdentity sender; + + /** + * Source address. + */ + const void *arg; + + /** + * Number of bytes in source address. + */ + size_t args; + + struct Session *session; +}; + + +/** + * Closure for 'find_receive_context'. + */ +struct FindReceiveContext +{ + /** + * Where to store the result. + */ + struct DefragContext *rc; + + /** + * Address to find. + */ + const struct sockaddr *addr; + + /** + * Number of bytes in 'addr'. + */ + socklen_t addr_len; + + struct Session *session; +}; + + + +/** + * Data structure to track defragmentation contexts based + * on the source of the UDP traffic. + */ +struct DefragContext +{ + + /** + * Defragmentation context. + */ + struct GNUNET_DEFRAGMENT_Context *defrag; + + /** + * Source address this receive context is for (allocated at the + * end of the struct). + */ + const struct sockaddr *src_addr; + + /** + * Reference to master plugin struct. + */ + struct Plugin *plugin; + + /** + * Node in the defrag heap. + */ + struct GNUNET_CONTAINER_HeapNode *hnode; + + /** + * Length of 'src_addr' + */ + size_t addr_len; +}; + + + +/** + * Closure for 'process_inbound_tokenized_messages' + */ +struct FragmentationContext +{ + struct FragmentationContext * next; + struct FragmentationContext * prev; + + struct Plugin * plugin; + struct GNUNET_FRAGMENT_Context * frag; + struct Session * session; + + struct GNUNET_TIME_Absolute timeout; + + + /** + * Function to call upon completion of the transmission. + */ + GNUNET_TRANSPORT_TransmitContinuation cont; + + /** + * Closure for 'cont'. + */ + void *cont_cls; + + size_t bytes_to_send; +}; + + +struct UDPMessageWrapper +{ + struct Session *session; + struct UDPMessageWrapper *prev; + struct UDPMessageWrapper *next; + char *udp; + size_t msg_size; + + struct GNUNET_TIME_Absolute timeout; + + /** + * Function to call upon completion of the transmission. + */ + GNUNET_TRANSPORT_TransmitContinuation cont; + + /** + * Closure for 'cont'. + */ + void *cont_cls; + + struct FragmentationContext *frag_ctx; + +}; + + +/** + * UDP ACK Message-Packet header (after defragmentation). + */ +struct UDP_ACK_Message +{ + /** + * Message header. + */ + struct GNUNET_MessageHeader header; + + /** + * Desired delay for flow control + */ + uint32_t delay; + + /** + * What is the identity of the sender + */ + struct GNUNET_PeerIdentity sender; + +}; + +/** + * We have been notified that our readset has something to read. We don't + * know which socket needs to be read, so we have to check each one + * Then reschedule this function to be called again once more is available. + * + * @param cls the plugin handle + * @param tc the scheduling context (for rescheduling this function again) + */ +static void +udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); + +/** + * We have been notified that our readset has something to read. We don't + * know which socket needs to be read, so we have to check each one + * Then reschedule this function to be called again once more is available. + * + * @param cls the plugin handle + * @param tc the scheduling context (for rescheduling this function again) + */ +static void +udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); + +/** + * Function called for a quick conversion of the binary address to + * a numeric address. Note that the caller must not free the + * address and that the next call to this function is allowed + * to override the address again. + * + * @param cls closure + * @param addr binary address + * @param addrlen length of the address + * @return string representing the same address + */ +const char * +udp_address_to_string (void *cls, const void *addr, size_t addrlen) +{ + static char rbuf[INET6_ADDRSTRLEN + 10]; + char buf[INET6_ADDRSTRLEN]; + const void *sb; + struct in_addr a4; + struct in6_addr a6; + const struct IPv4UdpAddress *t4; + const struct IPv6UdpAddress *t6; + int af; + uint16_t port; + + if (addrlen == sizeof (struct IPv6UdpAddress)) + { + t6 = addr; + af = AF_INET6; + port = ntohs (t6->u6_port); + memcpy (&a6, &t6->ipv6_addr, sizeof (a6)); + sb = &a6; + } + else if (addrlen == sizeof (struct IPv4UdpAddress)) + { + t4 = addr; + af = AF_INET; + port = ntohs (t4->u4_port); + memcpy (&a4, &t4->ipv4_addr, sizeof (a4)); + sb = &a4; + } + else + { + GNUNET_break_op (0); + return NULL; + } + inet_ntop (af, sb, buf, INET6_ADDRSTRLEN); + GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u", + buf, port); + return rbuf; +} + + +/** + * Append our port and forward the result. + * + * @param cls a 'struct PrettyPrinterContext' + * @param hostname result from DNS resolver + */ +static void +append_port (void *cls, const char *hostname) +{ + struct PrettyPrinterContext *ppc = cls; + char *ret; + + if (hostname == NULL) + { + ppc->asc (ppc->asc_cls, NULL); + GNUNET_free (ppc); + return; + } + GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port); + ppc->asc (ppc->asc_cls, ret); + GNUNET_free (ret); +} + + +/** + * Convert the transports address to a nice, human-readable + * format. + * + * @param cls closure + * @param type name of the transport that generated the address + * @param addr one of the addresses of the host, NULL for the last address + * the specific address format depends on the transport + * @param addrlen length of the address + * @param numeric should (IP) addresses be displayed in numeric form? + * @param timeout after how long should we give up? + * @param asc function to call on each string + * @param asc_cls closure for asc + */ +static void +udp_plugin_address_pretty_printer (void *cls, const char *type, + const void *addr, size_t addrlen, + int numeric, + struct GNUNET_TIME_Relative timeout, + GNUNET_TRANSPORT_AddressStringCallback asc, + void *asc_cls) +{ + struct PrettyPrinterContext *ppc; + const void *sb; + size_t sbs; + struct sockaddr_in a4; + struct sockaddr_in6 a6; + const struct IPv4UdpAddress *u4; + const struct IPv6UdpAddress *u6; + uint16_t port; + + if (addrlen == sizeof (struct IPv6UdpAddress)) + { + u6 = addr; + memset (&a6, 0, sizeof (a6)); + a6.sin6_family = AF_INET6; +#if HAVE_SOCKADDR_IN_SIN_LEN + a6.sin6_len = sizeof (a6); +#endif + a6.sin6_port = u6->u6_port; + memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr)); + port = ntohs (u6->u6_port); + sb = &a6; + sbs = sizeof (a6); + } + else if (addrlen == sizeof (struct IPv4UdpAddress)) + { + u4 = addr; + memset (&a4, 0, sizeof (a4)); + a4.sin_family = AF_INET; +#if HAVE_SOCKADDR_IN_SIN_LEN + a4.sin_len = sizeof (a4); +#endif + a4.sin_port = u4->u4_port; + a4.sin_addr.s_addr = u4->ipv4_addr; + port = ntohs (u4->u4_port); + sb = &a4; + sbs = sizeof (a4); + } + else + { + /* invalid address */ + GNUNET_break_op (0); + asc (asc_cls, NULL); + return; + } + ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext)); + ppc->asc = asc; + ppc->asc_cls = asc_cls; + ppc->port = port; + GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc); +} + + +/** + * Check if the given port is plausible (must be either our listen + * port or our advertised port). If it is neither, we return + * GNUNET_SYSERR. + * + * @param plugin global variables + * @param in_port port number to check + * @return GNUNET_OK if port is either open_port or adv_port + */ +static int +check_port (struct Plugin *plugin, uint16_t in_port) +{ + if ((in_port == plugin->port) || (in_port == plugin->aport)) + return GNUNET_OK; + return GNUNET_SYSERR; +} + + + +/** + * Function that will be called to check if a binary address for this + * plugin is well-formed and corresponds to an address for THIS peer + * (as per our configuration). Naturally, if absolutely necessary, + * plugins can be a bit conservative in their answer, but in general + * plugins should make sure that the address does not redirect + * traffic to a 3rd party that might try to man-in-the-middle our + * traffic. + * + * @param cls closure, should be our handle to the Plugin + * @param addr pointer to the address + * @param addrlen length of addr + * @return GNUNET_OK if this is a plausible address for this peer + * and transport, GNUNET_SYSERR if not + * + */ +static int +udp_plugin_check_address (void *cls, const void *addr, size_t addrlen) +{ + struct Plugin *plugin = cls; + struct IPv4UdpAddress *v4; + struct IPv6UdpAddress *v6; + + if ((addrlen != sizeof (struct IPv4UdpAddress)) && + (addrlen != sizeof (struct IPv6UdpAddress))) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + if (addrlen == sizeof (struct IPv4UdpAddress)) + { + v4 = (struct IPv4UdpAddress *) addr; + if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port))) + return GNUNET_SYSERR; + if (GNUNET_OK != + GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr, + sizeof (struct in_addr))) + return GNUNET_SYSERR; + } + else + { + v6 = (struct IPv6UdpAddress *) addr; + if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr)) + { + GNUNET_break_op (0); + return GNUNET_SYSERR; + } + if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port))) + return GNUNET_SYSERR; + if (GNUNET_OK != + GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr, + sizeof (struct in6_addr))) + return GNUNET_SYSERR; + } + return GNUNET_OK; +} + + +/** + * Destroy a session, plugin is being unloaded. + * + * @param cls unused + * @param key hash of public key of target peer + * @param value a 'struct PeerSession*' to clean up + * @return GNUNET_OK (continue to iterate) + */ +static int +disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value) +{ + struct Plugin *plugin = cls; + struct Session *s = value; + struct UDPMessageWrapper *udpw; + struct UDPMessageWrapper *next; + +#if DEBUG_UDP + LOG (GNUNET_ERROR_TYPE_DEBUG, + "Session %p to peer `%s' address ended \n", + s, + GNUNET_i2s (&s->target), + GNUNET_a2s (s->sock_addr, s->addrlen)); +#endif + + if (s->frag_ctx != NULL) + { + GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag); + GNUNET_free (s->frag_ctx); + s->frag_ctx = NULL; + } + + udpw = plugin->ipv4_queue_head; + while (udpw != NULL) + { + next = udpw->next; + if (udpw->session == s) + { + GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw); + + if (udpw->cont != NULL) + udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR); + GNUNET_free (udpw); + } + udpw = next; + } + + udpw = plugin->ipv6_queue_head; + while (udpw != NULL) + { + next = udpw->next; + if (udpw->session == s) + { + GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw); + + if (udpw->cont != NULL) + udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR); + GNUNET_free (udpw); + } + udpw = next; + } + + plugin->env->session_end (plugin->env->cls, &s->target, s); + + GNUNET_assert (GNUNET_YES == + GNUNET_CONTAINER_multihashmap_remove (plugin->sessions, + &s->target.hashPubKey, + s)); + + + GNUNET_free (s); + return GNUNET_OK; +} + + +/** + * Disconnect from a remote node. Clean up session if we have one for this peer + * + * @param cls closure for this call (should be handle to Plugin) + * @param target the peeridentity of the peer to disconnect + * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed + */ +static void +udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target) +{ + struct Plugin *plugin = cls; + GNUNET_assert (plugin != NULL); + + GNUNET_assert (target != NULL); +#if DEBUG_UDP + LOG (GNUNET_ERROR_TYPE_DEBUG, + "Disconnecting from peer `%s'\n", GNUNET_i2s (target)); +#endif + /* Clean up sessions */ + GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin); +} + +static struct Session * +create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target, + const void *addr, size_t addrlen, + GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls) +{ + struct Session *s; + const struct IPv4UdpAddress *t4; + const struct IPv6UdpAddress *t6; + struct sockaddr_in *v4; + struct sockaddr_in6 *v6; + size_t len; + + switch (addrlen) + { + case sizeof (struct IPv4UdpAddress): + if (NULL == plugin->sockv4) + { + return NULL; + } + t4 = addr; + s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in)); + len = sizeof (struct sockaddr_in); + v4 = (struct sockaddr_in *) &s[1]; + v4->sin_family = AF_INET; +#if HAVE_SOCKADDR_IN_SIN_LEN + v4->sin_len = sizeof (struct sockaddr_in); +#endif + v4->sin_port = t4->u4_port; + v4->sin_addr.s_addr = t4->ipv4_addr; + s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in)); + break; + case sizeof (struct IPv6UdpAddress): + if (NULL == plugin->sockv6) + { + return NULL; + } + t6 = addr; + s = + GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6)); + len = sizeof (struct sockaddr_in6); + v6 = (struct sockaddr_in6 *) &s[1]; + v6->sin6_family = AF_INET6; +#if HAVE_SOCKADDR_IN_SIN_LEN + v6->sin6_len = sizeof (struct sockaddr_in6); +#endif + v6->sin6_port = t6->u6_port; + v6->sin6_addr = t6->ipv6_addr; + s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6)); + break; + default: + /* Must have a valid address to send to */ + GNUNET_break_op (0); + return NULL; + } + + s->addrlen = len; + s->target = *target; + s->sock_addr = (const struct sockaddr *) &s[1]; + s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero(); + s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero(); + s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS; + + return s; +} + +static int session_cmp_it (void *cls, + const GNUNET_HashCode * key, + void *value) +{ + struct SessionCompareContext * cctx = cls; + const struct GNUNET_HELLO_Address *address = cctx->addr; + struct Session *s = value; + + socklen_t s_addrlen = s->addrlen; + +#if VERBOSE_UDP + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n", + udp_address_to_string (NULL, (void *) address->address, address->address_length), + GNUNET_a2s (s->sock_addr, s->addrlen)); +#endif + + if ((address->address_length == sizeof (struct IPv4UdpAddress)) && + (s_addrlen == sizeof (struct sockaddr_in))) + { + struct IPv4UdpAddress * u4 = NULL; + u4 = (struct IPv4UdpAddress *) address->address; + const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr; + if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) && + (u4->u4_port == s4->sin_port)) + { + cctx->res = s; + return GNUNET_NO; + } + + } + if ((address->address_length == sizeof (struct IPv6UdpAddress)) && + (s_addrlen == sizeof (struct sockaddr_in6))) + { + struct IPv6UdpAddress * u6 = NULL; + u6 = (struct IPv6UdpAddress *) address->address; + const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr; + if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) && + (u6->u6_port == s6->sin6_port)) + { + cctx->res = s; + return GNUNET_NO; + } + } + + + return GNUNET_YES; +} + + +/** + * Creates a new outbound session the transport service will use to send data to the + * peer + * + * @param cls the plugin + * @param address the address + * @return the session or NULL of max connections exceeded + */ +static struct Session * +udp_plugin_get_session (void *cls, + const struct GNUNET_HELLO_Address *address) +{ + struct Session * s = NULL; + struct Plugin * plugin = cls; + struct IPv6UdpAddress * udp_a6; + struct IPv4UdpAddress * udp_a4; + + GNUNET_assert (plugin != NULL); + GNUNET_assert (address != NULL); + + + if ((address->address == NULL) || + ((address->address_length != sizeof (struct IPv4UdpAddress)) && + (address->address_length != sizeof (struct IPv6UdpAddress)))) + { + GNUNET_break (0); + return NULL; + } + + if (address->address_length == sizeof (struct IPv4UdpAddress)) + { + if (plugin->sockv4 == NULL) + return NULL; + udp_a4 = (struct IPv4UdpAddress *) address->address; + if (udp_a4->u4_port == 0) + return NULL; + } + + if (address->address_length == sizeof (struct IPv6UdpAddress)) + { + if (plugin->sockv6 == NULL) + return NULL; + udp_a6 = (struct IPv6UdpAddress *) address->address; + if (udp_a6->u6_port == 0) + return NULL; + } + + /* check if session already exists */ + struct SessionCompareContext cctx; + cctx.addr = address; + cctx.res = NULL; +#if VERBOSE_UDP + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Looking for existing session for peer `%s' `%s' \n", GNUNET_i2s (&address->peer), udp_address_to_string(NULL, address->address, address->address_length)); +#endif + GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx); + if (cctx.res != NULL) + { +#if VERBOSE_UDP + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res); +#endif + return cctx.res; + } + + /* otherwise create new */ + s = create_session (plugin, + &address->peer, + address->address, + address->address_length, + NULL, NULL); +#if VERBOSE + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Creating new session %p for peer `%s' address `%s'\n", + s, + GNUNET_i2s(&address->peer), + udp_address_to_string(NULL,address->address,address->address_length)); +#endif + GNUNET_assert (GNUNET_OK == + GNUNET_CONTAINER_multihashmap_put (plugin->sessions, + &s->target.hashPubKey, + s, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE)); + + return s; +} + +static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw) +{ + + if (udpw->session->addrlen == sizeof (struct sockaddr_in)) + GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw); + if (udpw->session->addrlen == sizeof (struct sockaddr_in6)) + GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw); +} + +/** + * Function that is called with messages created by the fragmentation + * module. In the case of the 'proc' callback of the + * GNUNET_FRAGMENT_context_create function, this function must + * eventually call 'GNUNET_FRAGMENT_context_transmission_done'. + * + * @param cls closure, the 'struct FragmentationContext' + * @param msg the message that was created + */ +static void +enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg) +{ + struct FragmentationContext *frag_ctx = cls; + struct Plugin *plugin = frag_ctx->plugin; + struct UDPMessageWrapper * udpw; + struct Session *s; + + size_t msg_len = ntohs (msg->size); + +#if VERBOSE_UDP + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper)); +#endif + + udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len); + udpw->session = frag_ctx->session; + s = udpw->session; + udpw->udp = (char *) &udpw[1]; + + udpw->msg_size = msg_len; + udpw->cont = frag_ctx->cont; + udpw->cont_cls = frag_ctx->cont_cls; + udpw->timeout = frag_ctx->timeout; + udpw->frag_ctx = frag_ctx; + memcpy (udpw->udp, msg, msg_len); + + enqueue (plugin, udpw); + + + if (s->addrlen == sizeof (struct sockaddr_in)) + { + if (plugin->with_v4_ws == GNUNET_NO) + { + if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK) + GNUNET_SCHEDULER_cancel(plugin->select_task); + + plugin->select_task = + GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, + GNUNET_SCHEDULER_NO_TASK, + GNUNET_TIME_UNIT_FOREVER_REL, + plugin->rs_v4, + plugin->ws_v4, + &udp_plugin_select, plugin); + plugin->with_v4_ws = GNUNET_YES; + } + } + + else if (s->addrlen == sizeof (struct sockaddr_in6)) + { + if (plugin->with_v6_ws == GNUNET_NO) + { + if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK) + GNUNET_SCHEDULER_cancel(plugin->select_task_v6); + + plugin->select_task_v6 = + GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, + GNUNET_SCHEDULER_NO_TASK, + GNUNET_TIME_UNIT_FOREVER_REL, + plugin->rs_v6, + plugin->ws_v6, + &udp_plugin_select_v6, plugin); + plugin->with_v6_ws = GNUNET_YES; + } + } + +} + + + + +/** + * 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 s which session must be used + * @param msgbuf the message to transmit + * @param msgbuf_size number of bytes in '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 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 +udp_plugin_send (void *cls, + struct Session *s, + const char *msgbuf, size_t msgbuf_size, + unsigned int priority, + struct GNUNET_TIME_Relative to, + GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls) +{ + struct Plugin *plugin = cls; + size_t mlen = msgbuf_size + sizeof (struct UDPMessage); + + struct UDPMessageWrapper * udpw; + struct UDPMessage *udp; + char mbuf[mlen]; + GNUNET_assert (plugin != NULL); + GNUNET_assert (s != NULL); + + if ((s->addrlen == sizeof (struct sockaddr_in6)) && (plugin->sockv6 == NULL)) + return GNUNET_SYSERR; + + if ((s->addrlen == sizeof (struct sockaddr_in)) && (plugin->sockv4 == NULL)) + return GNUNET_SYSERR; + + + if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE) + { + GNUNET_break (0); + return GNUNET_SYSERR; + } + + if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s)) + { + GNUNET_break (0); + return GNUNET_SYSERR; + } + + LOG (GNUNET_ERROR_TYPE_DEBUG, + "UDP transmits %u-byte message to `%s' using address `%s'\n", + msgbuf_size, + GNUNET_i2s (&s->target), + GNUNET_a2s(s->sock_addr, s->addrlen)); + + /* Message */ + udp = (struct UDPMessage *) mbuf; + udp->header.size = htons (mlen); + udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE); + udp->reserved = htonl (0); + udp->sender = *plugin->env->my_identity; + + if (mlen <= UDP_MTU) + { + udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen); + udpw->session = s; + udpw->udp = (char *) &udpw[1]; + udpw->msg_size = mlen; + udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to); + udpw->cont = cont; + udpw->cont_cls = cont_cls; + udpw->frag_ctx = NULL; + + memcpy (udpw->udp, udp, sizeof (struct UDPMessage)); + memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size); + + enqueue (plugin, udpw); + } + else + { + LOG (GNUNET_ERROR_TYPE_DEBUG, + "UDP has to fragment message \n"); + if (s->frag_ctx != NULL) + return GNUNET_SYSERR; + memcpy (&udp[1], msgbuf, msgbuf_size); + struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext)); + + frag_ctx->plugin = plugin; + frag_ctx->session = s; + frag_ctx->cont = cont; + frag_ctx->cont_cls = cont_cls; + frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to); + frag_ctx->bytes_to_send = mlen; + frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats, + UDP_MTU, + &plugin->tracker, + s->last_expected_delay, + &udp->header, + &enqueue_fragment, + frag_ctx); + + s->frag_ctx = frag_ctx; + + } + + if (s->addrlen == sizeof (struct sockaddr_in)) + { + if (plugin->with_v4_ws == GNUNET_NO) + { + if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK) + GNUNET_SCHEDULER_cancel(plugin->select_task); + + plugin->select_task = + GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, + GNUNET_SCHEDULER_NO_TASK, + GNUNET_TIME_UNIT_FOREVER_REL, + plugin->rs_v4, + plugin->ws_v4, + &udp_plugin_select, plugin); + plugin->with_v4_ws = GNUNET_YES; + } + } + + else if (s->addrlen == sizeof (struct sockaddr_in6)) + { + if (plugin->with_v6_ws == GNUNET_NO) + { + if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK) + GNUNET_SCHEDULER_cancel(plugin->select_task_v6); + + plugin->select_task_v6 = + GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT, + GNUNET_SCHEDULER_NO_TASK, + GNUNET_TIME_UNIT_FOREVER_REL, + plugin->rs_v6, + plugin->ws_v6, + &udp_plugin_select_v6, plugin); + plugin->with_v6_ws = GNUNET_YES; + } + } + + return mlen; +} + + +/** + * 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 +udp_nat_port_map_callback (void *cls, int add_remove, + const struct sockaddr *addr, socklen_t addrlen) +{ + struct Plugin *plugin = cls; + struct IPv4UdpAddress u4; + struct IPv6UdpAddress u6; + void *arg; + size_t args; + + /* convert 'addr' to our internal format */ + switch (addr->sa_family) + { + case AF_INET: + GNUNET_assert (addrlen == sizeof (struct sockaddr_in)); + u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr; + u4.u4_port = ((struct sockaddr_in *) addr)->sin_port; + arg = &u4; + args = sizeof (u4); + break; + case AF_INET6: + GNUNET_assert (addrlen == sizeof (struct sockaddr_in6)); + memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr, + sizeof (struct in6_addr)); + u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port; + arg = &u6; + args = sizeof (u6); + break; + default: + GNUNET_break (0); + return; + } + /* modify our published address list */ + plugin->env->notify_address (plugin->env->cls, add_remove, arg, args); +} + + + +/** + * Message tokenizer has broken up an incomming message. Pass it on + * to the service. + * + * @param cls the 'struct Plugin' + * @param client the 'struct SourceInformation' + * @param hdr the actual message + */ +static void +process_inbound_tokenized_messages (void *cls, void *client, + const struct GNUNET_MessageHeader *hdr) +{ + struct Plugin *plugin = cls; + struct SourceInformation *si = client; + struct GNUNET_ATS_Information ats[2]; + struct GNUNET_TIME_Relative delay; + + GNUNET_assert (si->session != NULL); + /* setup A |