2 This file is part of GNUnet
3 (C) 2002--2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file transport/plugin_transport_tcp.c
22 * @brief Implementation of the TCP transport service
23 * @author Christian Grothoff
26 #include "gnunet_hello_lib.h"
27 #include "gnunet_constants.h"
28 #include "gnunet_connection_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_nat_lib.h"
31 #include "gnunet_os_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_resolver_service.h"
34 #include "gnunet_server_lib.h"
35 #include "gnunet_service_lib.h"
36 #include "gnunet_signatures.h"
37 #include "gnunet_statistics_service.h"
38 #include "gnunet_transport_service.h"
39 #include "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define LOG(kind,...) GNUNET_log_from (kind, "transport-tcp",__VA_ARGS__)
45 * How long until we give up on establishing an NAT connection?
48 #define NAT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
51 GNUNET_NETWORK_STRUCT_BEGIN
54 * Initial handshake message for a session.
59 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
61 struct GNUNET_MessageHeader header;
64 * Identity of the node connecting (TCP client)
66 struct GNUNET_PeerIdentity clientIdentity;
72 * Basically a WELCOME message, but with the purpose
73 * of giving the waiting peer a client handle to use
75 struct TCP_NAT_ProbeMessage
78 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
80 struct GNUNET_MessageHeader header;
83 * Identity of the sender of the message.
85 struct GNUNET_PeerIdentity clientIdentity;
88 GNUNET_NETWORK_STRUCT_END
91 * Context for sending a NAT probe via TCP.
93 struct TCPProbeContext
97 * Active probes are kept in a DLL.
99 struct TCPProbeContext *next;
102 * Active probes are kept in a DLL.
104 struct TCPProbeContext *prev;
109 struct GNUNET_CONNECTION_Handle *sock;
112 * Message to be sent.
114 struct TCP_NAT_ProbeMessage message;
117 * Handle to the transmission.
119 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
122 * Transport plugin handle.
124 struct Plugin *plugin;
128 GNUNET_NETWORK_STRUCT_BEGIN
131 * Network format for IPv4 addresses.
133 struct IPv4TcpAddress
136 * IPv4 address, in network byte order.
138 uint32_t ipv4_addr GNUNET_PACKED;
141 * Port number, in network byte order.
143 uint16_t t4_port GNUNET_PACKED;
149 * Network format for IPv6 addresses.
151 struct IPv6TcpAddress
156 struct in6_addr ipv6_addr GNUNET_PACKED;
159 * Port number, in network byte order.
161 uint16_t t6_port GNUNET_PACKED;
164 GNUNET_NETWORK_STRUCT_END
167 * Encapsulation of all of the state of the plugin.
173 * Information kept for each message that is yet to
176 struct PendingMessage
180 * This is a doubly-linked list.
182 struct PendingMessage *next;
185 * This is a doubly-linked list.
187 struct PendingMessage *prev;
190 * The pending message
195 * Continuation function to call once the message
196 * has been sent. Can be NULL if there is no
197 * continuation to call.
199 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
202 * Closure for transmit_cont.
204 void *transmit_cont_cls;
207 * Timeout value for the pending message.
209 struct GNUNET_TIME_Absolute timeout;
212 * So that the gnunet-service-transport can group messages together,
213 * these pending messages need to accept a message buffer and size
214 * instead of just a GNUNET_MessageHeader.
222 * Session handle for TCP connections.
230 struct SessionHeader header;
233 * Pointer to the global plugin struct.
235 struct Plugin *plugin;
238 * The client (used to identify this connection)
240 struct GNUNET_SERVER_Client *client;
243 * Task cleaning up a NAT client connection establishment attempt;
245 GNUNET_SCHEDULER_TaskIdentifier nat_connection_timeout;
248 * Messages currently pending for transmission
249 * to this peer, if any.
251 struct PendingMessage *pending_messages_head;
254 * Messages currently pending for transmission
255 * to this peer, if any.
257 struct PendingMessage *pending_messages_tail;
260 * Handle for pending transmission request.
262 struct GNUNET_SERVER_TransmitHandle *transmit_handle;
265 * To whom are we talking to (set to our identity
266 * if we are still waiting for the welcome message)
268 struct GNUNET_PeerIdentity target;
271 * ID of task used to delay receiving more to throttle sender.
273 GNUNET_SCHEDULER_TaskIdentifier receive_delay_task;
276 * Session timeout task
278 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
281 * Address of the other peer (either based on our 'connect'
282 * call or on our 'accept' call).
284 * struct IPv4TcpAddress or struct IPv6TcpAddress
290 * Length of connect_addr.
295 * Last activity on this connection. Used to select preferred
298 struct GNUNET_TIME_Absolute last_activity;
301 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
303 int expecting_welcome;
306 * Was this a connection that was inbound (we accepted)? (GNUNET_YES/GNUNET_NO)
311 * Was this session created using NAT traversal?
316 * ATS network type in NBO
318 uint32_t ats_address_network_type;
323 * Encapsulation of all of the state of the plugin.
330 struct GNUNET_TRANSPORT_PluginEnvironment *env;
335 struct GNUNET_CONNECTION_Handle *lsock;
338 * Our handle to the NAT module.
340 struct GNUNET_NAT_Handle *nat;
343 * Map from peer identities to sessions for the given peer.
345 struct GNUNET_CONTAINER_MultiHashMap *sessionmap;
348 * Handle to the network service.
350 struct GNUNET_SERVICE_Context *service;
353 * Handle to the server for this service.
355 struct GNUNET_SERVER_Handle *server;
358 * Copy of the handler array where the closures are
359 * set to this struct's instance.
361 struct GNUNET_SERVER_MessageHandler *handlers;
364 * Map of peers we have tried to contact behind a NAT
366 struct GNUNET_CONTAINER_MultiHashMap *nat_wait_conns;
369 * List of active TCP probes.
371 struct TCPProbeContext *probe_head;
374 * List of active TCP probes.
376 struct TCPProbeContext *probe_tail;
379 * Handle for (DYN)DNS lookup of our external IP.
381 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
384 * How many more TCP sessions are we allowed to open right now?
386 unsigned long long max_connections;
389 * ID of task used to update our addresses when one expires.
391 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
394 * Port that we are actually listening on.
399 * Port that the user said we would have visible to the
408 * Start session timeout
411 start_session_timeout (struct Session *s);
415 * Increment session timeout due to activity
418 reschedule_session_timeout (struct Session *s);
425 stop_session_timeout (struct Session *s);
430 tcp_address_to_string (void *cls, const void *addr, size_t addrlen);
433 static unsigned int sessions;
437 inc_sessions (struct Plugin *plugin, struct Session *session, int line)
440 unsigned int size = GNUNET_CONTAINER_multihashmap_size(plugin->sessionmap);
441 if (sessions != size)
442 LOG (GNUNET_ERROR_TYPE_DEBUG, "Inconsistent sessions %u <-> session map size: %u\n",
444 LOG (GNUNET_ERROR_TYPE_DEBUG, "%4i Session increased to %u (session map size: %u): `%s' `%s'\n",
448 GNUNET_i2s (&session->target),
449 tcp_address_to_string (NULL, session->addr, session->addrlen));
454 dec_sessions (struct Plugin *plugin, struct Session *session, int line)
456 GNUNET_assert (sessions > 0);
457 unsigned int size = GNUNET_CONTAINER_multihashmap_size(plugin->sessionmap);
459 if (sessions != size)
460 LOG (GNUNET_ERROR_TYPE_DEBUG, "Inconsistent sessions %u <-> session map size: %u\n",
462 LOG (GNUNET_ERROR_TYPE_DEBUG, "%4i Session decreased to %u (session map size: %u): `%s' `%s'\n",
466 GNUNET_i2s (&session->target),
467 tcp_address_to_string (NULL, session->addr, session->addrlen));
473 * Function to check if an inbound connection is acceptable.
474 * Mostly used to limit the total number of open connections
477 * @param cls the 'struct Plugin'
478 * @param ucred credentials, if available, otherwise NULL
479 * @param addr address
480 * @param addrlen length of address
481 * @return GNUNET_YES to allow, GNUNET_NO to deny, GNUNET_SYSERR
482 * for unknown address family (will be denied).
485 plugin_tcp_access_check (void *cls,
486 const struct GNUNET_CONNECTION_Credentials *ucred,
487 const struct sockaddr *addr, socklen_t addrlen)
489 struct Plugin *plugin = cls;
491 LOG (GNUNET_ERROR_TYPE_DEBUG,
492 "Accepting new incoming TCP connection\n");
493 if (0 == plugin->max_connections)
495 plugin->max_connections--;
501 * Our external IP address/port mapping has changed.
503 * @param cls closure, the 'struct LocalAddrList'
504 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
505 * the previous (now invalid) one
506 * @param addr either the previous or the new public IP address
507 * @param addrlen actual lenght of the address
510 tcp_nat_port_map_callback (void *cls, int add_remove,
511 const struct sockaddr *addr, socklen_t addrlen)
513 struct Plugin *plugin = cls;
514 struct IPv4TcpAddress t4;
515 struct IPv6TcpAddress t6;
519 LOG (GNUNET_ERROR_TYPE_DEBUG,
520 "NPMC called with %d for address `%s'\n", add_remove,
521 GNUNET_a2s (addr, addrlen));
522 /* convert 'addr' to our internal format */
523 switch (addr->sa_family)
526 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
527 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
528 t4.t4_port = ((struct sockaddr_in *) addr)->sin_port;
533 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
534 memcpy (&t6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
535 sizeof (struct in6_addr));
536 t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
544 /* modify our published address list */
545 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
550 * Function called for a quick conversion of the binary address to
551 * a numeric address. Note that the caller must not free the
552 * address and that the next call to this function is allowed
553 * to override the address again.
555 * @param cls closure ('struct Plugin*')
556 * @param addr binary address
557 * @param addrlen length of the address
558 * @return string representing the same address
561 tcp_address_to_string (void *cls, const void *addr, size_t addrlen)
563 static char rbuf[INET6_ADDRSTRLEN + 12];
564 char buf[INET6_ADDRSTRLEN];
568 const struct IPv4TcpAddress *t4;
569 const struct IPv6TcpAddress *t6;
575 case sizeof (struct IPv6TcpAddress):
578 port = ntohs (t6->t6_port);
579 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
582 case sizeof (struct IPv4TcpAddress):
585 port = ntohs (t4->t4_port);
586 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
590 LOG (GNUNET_ERROR_TYPE_ERROR,
591 _("Unexpected address length: %u bytes\n"),
592 (unsigned int) addrlen);
596 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
598 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
601 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
608 * Function called to convert a string address to
611 * @param cls closure ('struct Plugin*')
612 * @param addr string address
613 * @param addrlen length of the address
614 * @param buf location to store the buffer
615 * @param added location to store the number of bytes in the buffer.
616 * If the function returns GNUNET_SYSERR, its contents are undefined.
617 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
620 tcp_string_to_address (void *cls, const char *addr, uint16_t addrlen,
621 void **buf, size_t *added)
623 struct sockaddr_storage socket_address;
625 if ((NULL == addr) || (addrlen == 0))
628 return GNUNET_SYSERR;
630 if ('\0' != addr[addrlen - 1])
633 return GNUNET_SYSERR;
635 if (strlen (addr) != addrlen - 1)
638 return GNUNET_SYSERR;
641 GNUNET_STRINGS_to_address_ip (addr, strlen (addr),
645 return GNUNET_SYSERR;
647 switch (socket_address.ss_family)
651 struct IPv4TcpAddress *t4;
652 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
654 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
655 t4->ipv4_addr = in4->sin_addr.s_addr;
656 t4->t4_port = in4->sin_port;
658 *added = sizeof (struct IPv4TcpAddress);
663 struct IPv6TcpAddress *t6;
664 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
665 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
666 t6->ipv6_addr = in6->sin6_addr;
667 t6->t6_port = in6->sin6_port;
669 *added = sizeof (struct IPv6TcpAddress);
673 return GNUNET_SYSERR;
678 struct SessionClientCtx
680 const struct GNUNET_SERVER_Client *client;
686 session_lookup_by_client_it (void *cls,
687 const GNUNET_HashCode * key,
690 struct SessionClientCtx *sc_ctx = cls;
691 struct Session *s = value;
693 if (s->client == sc_ctx->client)
703 * Find the session handle for the given client.
705 * @param plugin the plugin
706 * @param client which client to find the session handle for
707 * @return NULL if no matching session exists
709 static struct Session *
710 lookup_session_by_client (struct Plugin *plugin,
711 const struct GNUNET_SERVER_Client *client)
713 struct SessionClientCtx sc_ctx;
715 sc_ctx.client = client;
717 GNUNET_CONTAINER_multihashmap_iterate (plugin->sessionmap, &session_lookup_by_client_it, &sc_ctx);
723 * Create a new session. Also queues a welcome message.
725 * @param plugin the plugin
726 * @param target peer to connect to
727 * @param client client to use, reference counter must have already been increased
728 * @param is_nat this a NAT session, we should wait for a client to
729 * connect to us from an address, then assign that to
731 * @return new session object
733 static struct Session *
734 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
735 struct GNUNET_SERVER_Client *client, int is_nat)
738 struct PendingMessage *pm;
739 struct WelcomeMessage welcome;
741 if (GNUNET_YES != is_nat)
742 GNUNET_assert (NULL != client);
744 GNUNET_assert (NULL == client);
746 LOG (GNUNET_ERROR_TYPE_DEBUG,
747 "Creating new session for peer `%4s'\n",
748 GNUNET_i2s (target));
749 ret = GNUNET_malloc (sizeof (struct Session));
750 ret->last_activity = GNUNET_TIME_absolute_get ();
751 ret->plugin = plugin;
752 ret->is_nat = is_nat;
753 ret->client = client;
754 ret->target = *target;
755 ret->expecting_welcome = GNUNET_YES;
756 ret->ats_address_network_type = htonl (GNUNET_ATS_NET_UNSPECIFIED);
757 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
758 sizeof (struct WelcomeMessage));
759 pm->msg = (const char *) &pm[1];
760 pm->message_size = sizeof (struct WelcomeMessage);
761 welcome.header.size = htons (sizeof (struct WelcomeMessage));
762 welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
763 welcome.clientIdentity = *plugin->env->my_identity;
764 memcpy (&pm[1], &welcome, sizeof (welcome));
765 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
766 GNUNET_STATISTICS_update (plugin->env->stats,
767 gettext_noop ("# bytes currently in TCP buffers"),
768 pm->message_size, GNUNET_NO);
769 GNUNET_CONTAINER_DLL_insert (ret->pending_messages_head,
770 ret->pending_messages_tail, pm);
771 if (GNUNET_YES != is_nat)
773 GNUNET_STATISTICS_update (plugin->env->stats,
774 gettext_noop ("# TCP sessions active"), 1,
777 start_session_timeout (ret);
784 * If we have pending messages, ask the server to
785 * transmit them (schedule the respective tasks, etc.)
787 * @param session for which session should we do this
790 process_pending_messages (struct Session *session);
794 * Function called to notify a client about the socket
795 * being ready to queue more data. "buf" will be
796 * NULL and "size" zero if the socket was closed for
797 * writing in the meantime.
800 * @param size number of bytes available in buf
801 * @param buf where the callee should write the message
802 * @return number of bytes written to buf
805 do_transmit (void *cls, size_t size, void *buf)
807 struct Session *session = cls;
808 struct GNUNET_PeerIdentity pid;
809 struct Plugin *plugin;
810 struct PendingMessage *pos;
811 struct PendingMessage *hd;
812 struct PendingMessage *tl;
813 struct GNUNET_TIME_Absolute now;
817 GNUNET_assert (NULL != session);
818 session->transmit_handle = NULL;
819 plugin = session->plugin;
822 LOG (GNUNET_ERROR_TYPE_DEBUG,
823 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
824 GNUNET_i2s (&session->target));
825 /* timeout; cancel all messages that have already expired */
829 now = GNUNET_TIME_absolute_get ();
830 while ((NULL != (pos = session->pending_messages_head)) &&
831 (pos->timeout.abs_value <= now.abs_value))
833 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
834 session->pending_messages_tail, pos);
835 LOG (GNUNET_ERROR_TYPE_DEBUG,
836 "Failed to transmit %u byte message to `%4s'.\n",
837 pos->message_size, GNUNET_i2s (&session->target));
838 ret += pos->message_size;
839 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
841 /* do this call before callbacks (so that if callbacks destroy
842 * session, they have a chance to cancel actions done by this
844 process_pending_messages (session);
845 pid = session->target;
846 /* no do callbacks and do not use session again since
847 * the callbacks may abort the session */
848 while (NULL != (pos = hd))
850 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
851 if (pos->transmit_cont != NULL)
852 pos->transmit_cont (pos->transmit_cont_cls, &pid, GNUNET_SYSERR);
855 GNUNET_STATISTICS_update (plugin->env->stats,
856 gettext_noop ("# bytes currently in TCP buffers"),
857 -(int64_t) ret, GNUNET_NO);
858 GNUNET_STATISTICS_update (plugin->env->stats,
860 ("# bytes discarded by TCP (timeout)"), ret,
864 /* copy all pending messages that would fit */
869 while (NULL != (pos = session->pending_messages_head))
871 if (ret + pos->message_size > size)
873 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
874 session->pending_messages_tail, pos);
875 GNUNET_assert (size >= pos->message_size);
876 LOG (GNUNET_ERROR_TYPE_DEBUG,
877 "Transmitting message of type %u\n",
878 ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type));
879 /* FIXME: this memcpy can be up to 7% of our total runtime */
880 memcpy (cbuf, pos->msg, pos->message_size);
881 cbuf += pos->message_size;
882 ret += pos->message_size;
883 size -= pos->message_size;
884 GNUNET_CONTAINER_DLL_insert_tail (hd, tl, pos);
886 /* schedule 'continuation' before callbacks so that callbacks that
887 * cancel everything don't cause us to use a session that no longer
889 process_pending_messages (session);
890 session->last_activity = GNUNET_TIME_absolute_get ();
891 pid = session->target;
892 /* we'll now call callbacks that may cancel the session; hence
893 * we should not use 'session' after this point */
894 while (NULL != (pos = hd))
896 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
897 if (pos->transmit_cont != NULL)
898 pos->transmit_cont (pos->transmit_cont_cls, &pid, GNUNET_OK);
901 GNUNET_assert (hd == NULL);
902 GNUNET_assert (tl == NULL);
903 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes\n",
905 GNUNET_STATISTICS_update (plugin->env->stats,
906 gettext_noop ("# bytes currently in TCP buffers"),
907 -(int64_t) ret, GNUNET_NO);
908 GNUNET_STATISTICS_update (plugin->env->stats,
909 gettext_noop ("# bytes transmitted via TCP"), ret,
916 * If we have pending messages, ask the server to
917 * transmit them (schedule the respective tasks, etc.)
919 * @param session for which session should we do this
922 process_pending_messages (struct Session *session)
924 struct PendingMessage *pm;
926 GNUNET_assert (session->client != NULL);
927 if (session->transmit_handle != NULL)
929 if (NULL == (pm = session->pending_messages_head))
932 session->transmit_handle =
933 GNUNET_SERVER_notify_transmit_ready (session->client, pm->message_size,
934 GNUNET_TIME_absolute_get_remaining
935 (pm->timeout), &do_transmit,
941 * Functions with this signature are called whenever we need
942 * to close a session due to a disconnect or failure to
943 * establish a connection.
945 * @param session session to close down
948 disconnect_session (struct Session *session)
950 struct PendingMessage *pm;
951 struct Plugin * plugin = session->plugin;
953 LOG (GNUNET_ERROR_TYPE_DEBUG,
954 "Disconnecting session of peer `%s' address `%s'\n",
955 GNUNET_i2s (&session->target),
956 tcp_address_to_string (NULL, session->addr, session->addrlen));
958 stop_session_timeout (session);
960 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (plugin->sessionmap, &session->target.hashPubKey, session))
962 GNUNET_STATISTICS_update (session->plugin->env->stats,
963 gettext_noop ("# TCP sessions active"), -1,
965 dec_sessions (plugin, session, __LINE__);
967 else GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (plugin->nat_wait_conns, &session->target.hashPubKey, session));
970 if (session->transmit_handle != NULL)
972 GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
973 session->transmit_handle = NULL;
975 session->plugin->env->session_end (session->plugin->env->cls,
976 &session->target, session);
978 if (GNUNET_SCHEDULER_NO_TASK != session->nat_connection_timeout)
980 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
981 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
984 while (NULL != (pm = session->pending_messages_head))
986 LOG (GNUNET_ERROR_TYPE_DEBUG,
988 NULL ? "Could not deliver message to `%4s'.\n" :
989 "Could not deliver message to `%4s', notifying.\n",
990 GNUNET_i2s (&session->target));
991 GNUNET_STATISTICS_update (session->plugin->env->stats,
992 gettext_noop ("# bytes currently in TCP buffers"),
993 -(int64_t) pm->message_size, GNUNET_NO);
994 GNUNET_STATISTICS_update (session->plugin->env->stats,
996 ("# bytes discarded by TCP (disconnect)"),
997 pm->message_size, GNUNET_NO);
998 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
999 session->pending_messages_tail, pm);
1000 if (NULL != pm->transmit_cont)
1001 pm->transmit_cont (pm->transmit_cont_cls, &session->target,
1005 if (session->receive_delay_task != GNUNET_SCHEDULER_NO_TASK)
1007 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1008 if (NULL != session->client)
1009 GNUNET_SERVER_receive_done (session->client, GNUNET_SYSERR);
1011 if (NULL != session->client)
1013 GNUNET_SERVER_client_disconnect (session->client);
1014 GNUNET_SERVER_client_drop (session->client);
1015 session->client = NULL;
1017 GNUNET_free_non_null (session->addr);
1018 GNUNET_assert (NULL == session->transmit_handle);
1019 GNUNET_free (session);
1024 * Function that can be used by the transport service to transmit
1025 * a message using the plugin. Note that in the case of a
1026 * peer disconnecting, the continuation MUST be called
1027 * prior to the disconnect notification itself. This function
1028 * will be called with this peer's HELLO message to initiate
1029 * a fresh connection to another peer.
1031 * @param cls closure
1032 * @param session which session must be used
1033 * @param msgbuf the message to transmit
1034 * @param msgbuf_size number of bytes in 'msgbuf'
1035 * @param priority how important is the message (most plugins will
1036 * ignore message priority and just FIFO)
1037 * @param to how long to wait at most for the transmission (does not
1038 * require plugins to discard the message after the timeout,
1039 * just advisory for the desired delay; most plugins will ignore
1041 * @param cont continuation to call once the message has
1042 * been transmitted (or if the transport is ready
1043 * for the next transmission call; or if the
1044 * peer disconnected...); can be NULL
1045 * @param cont_cls closure for cont
1046 * @return number of bytes used (on the physical network, with overheads);
1047 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1048 * and does NOT mean that the message was not transmitted (DV)
1051 tcp_plugin_send (void *cls,
1052 struct Session *session,
1053 const char *msgbuf, size_t msgbuf_size,
1054 unsigned int priority,
1055 struct GNUNET_TIME_Relative to,
1056 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1058 struct Plugin * plugin = cls;
1059 struct PendingMessage *pm;
1061 GNUNET_assert (NULL != plugin);
1062 GNUNET_assert (NULL != session);
1064 /* create new message entry */
1065 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1066 pm->msg = (const char *) &pm[1];
1067 memcpy (&pm[1], msgbuf, msgbuf_size);
1068 pm->message_size = msgbuf_size;
1069 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1070 pm->transmit_cont = cont;
1071 pm->transmit_cont_cls = cont_cls;
1073 LOG (GNUNET_ERROR_TYPE_DEBUG,
1074 "Asked to transmit %u bytes to `%s', added message to list.\n",
1075 msgbuf_size, GNUNET_i2s (&session->target));
1077 reschedule_session_timeout (session);
1079 if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessionmap, &session->target.hashPubKey, session))
1081 GNUNET_assert (session->client != NULL);
1083 GNUNET_SERVER_client_set_timeout (session->client,
1084 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1085 GNUNET_STATISTICS_update (plugin->env->stats,
1086 gettext_noop ("# bytes currently in TCP buffers"),
1087 msgbuf_size, GNUNET_NO);
1089 /* append pm to pending_messages list */
1090 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1091 session->pending_messages_tail, pm);
1093 process_pending_messages (session);
1096 else if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains_value(plugin->nat_wait_conns, &session->target.hashPubKey, session))
1098 LOG (GNUNET_ERROR_TYPE_DEBUG,
1099 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1100 GNUNET_i2s (&session->target));
1102 GNUNET_STATISTICS_update (plugin->env->stats,
1103 gettext_noop ("# bytes currently in TCP buffers"),
1104 msgbuf_size, GNUNET_NO);
1106 /* append pm to pending_messages list */
1107 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1108 session->pending_messages_tail, pm);
1114 cont (cont_cls, &session->target, GNUNET_SYSERR);
1117 return GNUNET_SYSERR; /* session does not exist here */
1126 struct Session *result;
1131 session_lookup_it (void *cls,
1132 const GNUNET_HashCode *key,
1135 struct SessionItCtx * si_ctx = cls;
1136 struct Session * session = value;
1138 char * a1 = strdup (tcp_address_to_string(NULL, session->addr, session->addrlen));
1139 char * a2 = strdup (tcp_address_to_string(NULL, si_ctx->addr, si_ctx->addrlen));
1140 LOG (GNUNET_ERROR_TYPE_DEBUG,
1141 "Comparing: %s %u <-> %s %u\n",
1149 if (session->addrlen != si_ctx->addrlen)
1153 if (0 != memcmp (session->addr, si_ctx->addr, si_ctx->addrlen))
1158 a1 = strdup (tcp_address_to_string(NULL, session->addr, session->addrlen));
1159 a2 = strdup (tcp_address_to_string(NULL, si_ctx->addr, si_ctx->addrlen));
1160 LOG (GNUNET_ERROR_TYPE_DEBUG,
1161 "Comparing: %s %u <-> %s %u , OK!\n",
1169 /* Found existing session */
1170 si_ctx->result = session;
1176 * Task cleaning up a NAT connection attempt after timeout
1179 nat_connect_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1181 struct Session *session = cls;
1183 LOG (GNUNET_ERROR_TYPE_DEBUG,
1184 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1185 GNUNET_i2s (&session->target), tcp_address_to_string(NULL, session->addr, session->addrlen));
1186 disconnect_session (session);
1191 * Create a new session to transmit data to the target
1192 * This session will used to send data to this peer and the plugin will
1193 * notify us by calling the env->session_end function
1195 * @param cls closure
1196 * @param address pointer to the GNUNET_HELLO_Address
1197 * @return the session if the address is valid, NULL otherwise
1199 static struct Session *
1200 tcp_plugin_get_session (void *cls,
1201 const struct GNUNET_HELLO_Address *address)
1203 struct Plugin * plugin = cls;
1204 struct Session * session = NULL;
1208 struct GNUNET_CONNECTION_Handle *sa;
1209 struct sockaddr_in a4;
1210 struct sockaddr_in6 a6;
1211 const struct IPv4TcpAddress *t4;
1212 const struct IPv6TcpAddress *t6;
1213 struct GNUNET_ATS_Information ats;
1214 unsigned int is_natd = GNUNET_NO;
1217 GNUNET_assert (plugin != NULL);
1218 GNUNET_assert (address != NULL);
1219 addrlen = address->address_length;
1220 LOG (GNUNET_ERROR_TYPE_DEBUG,
1221 "Trying to get session for `%s' address of peer `%s'\n",
1222 tcp_address_to_string(NULL, address->address, address->address_length),
1223 GNUNET_i2s (&address->peer));
1225 /* look for existing session */
1227 GNUNET_CONTAINER_multihashmap_contains(plugin->sessionmap, &address->peer.hashPubKey))
1229 struct SessionItCtx si_ctx;
1231 si_ctx.addr = (void *) address->address;
1232 si_ctx.addrlen = address->address_length;
1234 si_ctx.result = NULL;
1236 GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessionmap, &address->peer.hashPubKey, &session_lookup_it, &si_ctx);
1237 if (si_ctx.result != NULL)
1239 session = si_ctx.result;
1240 LOG (GNUNET_ERROR_TYPE_DEBUG,
1241 "Found exisiting session for `%s' address `%s' session %p\n",
1242 GNUNET_i2s (&address->peer),
1243 tcp_address_to_string(NULL, address->address, address->address_length),
1247 LOG (GNUNET_ERROR_TYPE_DEBUG,
1248 "Existing sessions did not match address `%s' or peer `%s'\n",
1249 tcp_address_to_string(NULL, address->address, address->address_length),
1250 GNUNET_i2s (&address->peer));
1253 if (addrlen == sizeof (struct IPv6TcpAddress))
1255 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1256 t6 = address->address;
1258 memset (&a6, 0, sizeof (a6));
1259 #if HAVE_SOCKADDR_IN_SIN_LEN
1260 a6.sin6_len = sizeof (a6);
1262 a6.sin6_family = AF_INET6;
1263 a6.sin6_port = t6->t6_port;
1264 if (t6->t6_port == 0)
1265 is_natd = GNUNET_YES;
1266 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1270 else if (addrlen == sizeof (struct IPv4TcpAddress))
1272 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1273 t4 = address->address;
1275 memset (&a4, 0, sizeof (a4));
1276 #if HAVE_SOCKADDR_IN_SIN_LEN
1277 a4.sin_len = sizeof (a4);
1279 a4.sin_family = AF_INET;
1280 a4.sin_port = t4->t4_port;
1281 if (t4->t4_port == 0)
1282 is_natd = GNUNET_YES;
1283 a4.sin_addr.s_addr = t4->ipv4_addr;
1289 LOG (GNUNET_ERROR_TYPE_ERROR,
1290 _("Address of unexpected length: %u\n"), addrlen);
1295 ats = plugin->env->get_address_type (plugin->env->cls, sb ,sbs);
1297 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1299 /* NAT client only works with IPv4 addresses */
1303 if (0 == plugin->max_connections)
1309 if ((is_natd == GNUNET_YES) &&
1311 GNUNET_CONTAINER_multihashmap_contains (plugin->nat_wait_conns,
1312 &address->peer.hashPubKey)))
1314 /* Only do one NAT punch attempt per peer identity */
1318 if ((is_natd == GNUNET_YES) && (NULL != plugin->nat) &&
1320 GNUNET_CONTAINER_multihashmap_contains (plugin->nat_wait_conns,
1321 &address->peer.hashPubKey)))
1323 LOG (GNUNET_ERROR_TYPE_DEBUG,
1324 "Found valid IPv4 NAT address (creating session)!\n") ;
1325 session = create_session (plugin, &address->peer, NULL, GNUNET_YES);
1326 session->addrlen = 0;
1327 session->addr = NULL;
1328 session->ats_address_network_type = ats.value;
1329 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed(NAT_TIMEOUT,
1330 &nat_connect_timeout,
1332 GNUNET_assert (session != NULL);
1333 GNUNET_assert (GNUNET_CONTAINER_multihashmap_put
1334 (plugin->nat_wait_conns, &address->peer.hashPubKey, session,
1335 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY) == GNUNET_OK);
1337 LOG (GNUNET_ERROR_TYPE_DEBUG,
1338 "Created NAT WAIT connection to `%4s' at `%s'\n",
1339 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1341 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1345 LOG (GNUNET_ERROR_TYPE_DEBUG,
1346 "Running NAT client for `%4s' at `%s' failed\n",
1347 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1348 disconnect_session (session);
1353 /* create new outbound session */
1354 GNUNET_assert (0 != plugin->max_connections);
1355 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1358 LOG (GNUNET_ERROR_TYPE_DEBUG,
1359 "Failed to create connection to `%4s' at `%s'\n",
1360 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1363 plugin->max_connections--;
1365 LOG (GNUNET_ERROR_TYPE_DEBUG,
1366 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1367 GNUNET_i2s (&address->peer), GNUNET_a2s (sb, sbs));
1369 session = create_session (plugin,
1371 GNUNET_SERVER_connect_socket (plugin->server, sa),
1373 session->addr = GNUNET_malloc (addrlen);
1374 memcpy (session->addr, address->address, addrlen);
1375 session->addrlen = addrlen;
1376 session->ats_address_network_type = ats.value;
1378 GNUNET_CONTAINER_multihashmap_put(plugin->sessionmap, &address->peer.hashPubKey, session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1379 inc_sessions (plugin, session, __LINE__);
1380 LOG (GNUNET_ERROR_TYPE_DEBUG,
1381 "Creating new session for `%s' address `%s' session %p\n",
1382 GNUNET_i2s (&address->peer),
1383 tcp_address_to_string(NULL, address->address, address->address_length),
1385 /* Send TCP Welcome */
1386 process_pending_messages (session);
1393 session_disconnect_it (void *cls,
1394 const GNUNET_HashCode * key,
1397 struct Session *session = value;
1399 GNUNET_STATISTICS_update (session->plugin->env->stats,
1401 ("# transport-service disconnect requests for TCP"),
1403 disconnect_session (session);
1409 * Function that can be called to force a disconnect from the
1410 * specified neighbour. This should also cancel all previously
1411 * scheduled transmissions. Obviously the transmission may have been
1412 * partially completed already, which is OK. The plugin is supposed
1413 * to close the connection (if applicable) and no longer call the
1414 * transmit continuation(s).
1416 * Finally, plugin MUST NOT call the services's receive function to
1417 * notify the service that the connection to the specified target was
1418 * closed after a getting this call.
1420 * @param cls closure
1421 * @param target peer for which the last transmission is
1425 tcp_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
1427 struct Plugin *plugin = cls;
1429 LOG (GNUNET_ERROR_TYPE_DEBUG,
1430 "Disconnecting peer `%4s'\n", GNUNET_i2s (target));
1431 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessionmap, &target->hashPubKey, &session_disconnect_it, plugin);
1432 GNUNET_CONTAINER_multihashmap_get_multiple (plugin->nat_wait_conns, &target->hashPubKey, &session_disconnect_it, plugin);
1437 * Context for address to string conversion.
1439 struct PrettyPrinterContext
1442 * Function to call with the result.
1444 GNUNET_TRANSPORT_AddressStringCallback asc;
1447 * Clsoure for 'asc'.
1452 * Port to add after the IP address.
1461 * Append our port and forward the result.
1463 * @param cls the 'struct PrettyPrinterContext*'
1464 * @param hostname hostname part of the address
1467 append_port (void *cls, const char *hostname)
1469 struct PrettyPrinterContext *ppc = cls;
1472 if (hostname == NULL)
1474 ppc->asc (ppc->asc_cls, NULL);
1478 if (GNUNET_YES == ppc->ipv6)
1479 GNUNET_asprintf (&ret, "[%s]:%d", hostname, ppc->port);
1481 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1482 ppc->asc (ppc->asc_cls, ret);
1488 * Convert the transports address to a nice, human-readable
1491 * @param cls closure
1492 * @param type name of the transport that generated the address
1493 * @param addr one of the addresses of the host, NULL for the last address
1494 * the specific address format depends on the transport
1495 * @param addrlen length of the address
1496 * @param numeric should (IP) addresses be displayed in numeric form?
1497 * @param timeout after how long should we give up?
1498 * @param asc function to call on each string
1499 * @param asc_cls closure for asc
1502 tcp_plugin_address_pretty_printer (void *cls, const char *type,
1503 const void *addr, size_t addrlen,
1505 struct GNUNET_TIME_Relative timeout,
1506 GNUNET_TRANSPORT_AddressStringCallback asc,
1509 struct PrettyPrinterContext *ppc;
1512 struct sockaddr_in a4;
1513 struct sockaddr_in6 a6;
1514 const struct IPv4TcpAddress *t4;
1515 const struct IPv6TcpAddress *t6;
1518 if (addrlen == sizeof (struct IPv6TcpAddress))
1521 memset (&a6, 0, sizeof (a6));
1522 a6.sin6_family = AF_INET6;
1523 a6.sin6_port = t6->t6_port;
1524 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1525 port = ntohs (t6->t6_port);
1529 else if (addrlen == sizeof (struct IPv4TcpAddress))
1532 memset (&a4, 0, sizeof (a4));
1533 a4.sin_family = AF_INET;
1534 a4.sin_port = t4->t4_port;
1535 a4.sin_addr.s_addr = t4->ipv4_addr;
1536 port = ntohs (t4->t4_port);
1540 else if (0 == addrlen)
1542 asc (asc_cls, "<inbound connection>");
1543 asc (asc_cls, NULL);
1548 /* invalid address */
1549 GNUNET_break_op (0);
1550 asc (asc_cls, NULL);
1553 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1554 if (addrlen == sizeof (struct IPv6TcpAddress))
1555 ppc->ipv6 = GNUNET_YES;
1557 ppc->ipv6 = GNUNET_NO;
1559 ppc->asc_cls = asc_cls;
1561 GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
1566 * Check if the given port is plausible (must be either our listen
1567 * port or our advertised port), or any port if we are behind NAT
1568 * and do not have a port open. If it is neither, we return
1571 * @param plugin global variables
1572 * @param in_port port number to check
1573 * @return GNUNET_OK if port is either open_port or adv_port
1576 check_port (struct Plugin *plugin, uint16_t in_port)
1578 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1580 return GNUNET_SYSERR;
1585 * Function that will be called to check if a binary address for this
1586 * plugin is well-formed and corresponds to an address for THIS peer
1587 * (as per our configuration). Naturally, if absolutely necessary,
1588 * plugins can be a bit conservative in their answer, but in general
1589 * plugins should make sure that the address does not redirect
1590 * traffic to a 3rd party that might try to man-in-the-middle our
1593 * @param cls closure, our 'struct Plugin*'
1594 * @param addr pointer to the address
1595 * @param addrlen length of addr
1596 * @return GNUNET_OK if this is a plausible address for this peer
1597 * and transport, GNUNET_SYSERR if not
1600 tcp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1602 struct Plugin *plugin = cls;
1603 struct IPv4TcpAddress *v4;
1604 struct IPv6TcpAddress *v6;
1606 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1607 (addrlen != sizeof (struct IPv6TcpAddress)))
1609 GNUNET_break_op (0);
1610 return GNUNET_SYSERR;
1612 if (addrlen == sizeof (struct IPv4TcpAddress))
1614 v4 = (struct IPv4TcpAddress *) addr;
1615 if (GNUNET_OK != check_port (plugin, ntohs (v4->t4_port)))
1616 return GNUNET_SYSERR;
1618 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1619 sizeof (struct in_addr)))
1620 return GNUNET_SYSERR;
1624 v6 = (struct IPv6TcpAddress *) addr;
1625 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1627 GNUNET_break_op (0);
1628 return GNUNET_SYSERR;
1630 if (GNUNET_OK != check_port (plugin, ntohs (v6->t6_port)))
1631 return GNUNET_SYSERR;
1633 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1634 sizeof (struct in6_addr)))
1635 return GNUNET_SYSERR;
1642 * We've received a nat probe from this peer via TCP. Finish
1643 * creating the client session and resume sending of queued
1646 * @param cls closure
1647 * @param client identification of the client
1648 * @param message the actual message
1651 handle_tcp_nat_probe (void *cls, struct GNUNET_SERVER_Client *client,
1652 const struct GNUNET_MessageHeader *message)
1654 struct Plugin *plugin = cls;
1655 struct Session *session;
1656 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1659 struct IPv4TcpAddress *t4;
1660 struct IPv6TcpAddress *t6;
1661 const struct sockaddr_in *s4;
1662 const struct sockaddr_in6 *s6;
1664 LOG (GNUNET_ERROR_TYPE_DEBUG, "received NAT probe\n");
1666 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1667 * a connection to this peer by running gnunet-nat-client. This peer
1668 * received the punch message and now wants us to use the new connection
1669 * as the default for that peer. Do so and then send a WELCOME message
1670 * so we can really be connected!
1672 if (ntohs (message->size) != sizeof (struct TCP_NAT_ProbeMessage))
1674 GNUNET_break_op (0);
1675 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1679 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
1681 memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
1682 sizeof (struct GNUNET_PeerIdentity)))
1684 /* refuse connections from ourselves */
1685 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1690 GNUNET_CONTAINER_multihashmap_get (plugin->nat_wait_conns,
1692 clientIdentity.hashPubKey);
1693 if (session == NULL)
1695 LOG (GNUNET_ERROR_TYPE_DEBUG,
1696 "Did NOT find session for NAT probe!\n");
1697 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1700 LOG (GNUNET_ERROR_TYPE_DEBUG,
1701 "Found session for NAT probe!\n");
1703 if (session->nat_connection_timeout != GNUNET_SCHEDULER_NO_TASK)
1705 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
1706 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1709 if (GNUNET_OK != GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1712 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1713 disconnect_session (session);
1716 GNUNET_assert (GNUNET_CONTAINER_multihashmap_remove
1717 (plugin->nat_wait_conns,
1718 &tcp_nat_probe->clientIdentity.hashPubKey,
1719 session) == GNUNET_YES);
1720 GNUNET_CONTAINER_multihashmap_put(plugin->sessionmap,
1721 &session->target.hashPubKey, session,
1722 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1723 session->last_activity = GNUNET_TIME_absolute_get ();
1724 session->inbound = GNUNET_NO;
1725 LOG (GNUNET_ERROR_TYPE_DEBUG,
1726 "Found address `%s' for incoming connection\n",
1727 GNUNET_a2s (vaddr, alen));
1728 switch (((const struct sockaddr *) vaddr)->sa_family)
1732 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1733 t4->t4_port = s4->sin_port;
1734 t4->ipv4_addr = s4->sin_addr.s_addr;
1736 session->addrlen = sizeof (struct IPv4TcpAddress);
1740 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1741 t6->t6_port = s6->sin6_port;
1742 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
1744 session->addrlen = sizeof (struct IPv6TcpAddress);
1747 GNUNET_break_op (0);
1748 LOG (GNUNET_ERROR_TYPE_DEBUG,
1749 "Bad address for incoming connection!\n");
1750 GNUNET_free (vaddr);
1751 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1752 disconnect_session (session);
1755 GNUNET_free (vaddr);
1756 GNUNET_break (NULL == session->client);
1757 GNUNET_SERVER_client_keep (client);
1758 session->client = client;
1759 inc_sessions (plugin, session, __LINE__);
1760 GNUNET_STATISTICS_update (plugin->env->stats,
1761 gettext_noop ("# TCP sessions active"), 1,
1763 process_pending_messages (session);
1764 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1769 * We've received a welcome from this peer via TCP. Possibly create a
1770 * fresh client record and send back our welcome.
1772 * @param cls closure
1773 * @param client identification of the client
1774 * @param message the actual message
1777 handle_tcp_welcome (void *cls, struct GNUNET_SERVER_Client *client,
1778 const struct GNUNET_MessageHeader *message)
1780 struct Plugin *plugin = cls;
1781 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
1782 struct Session *session;
1785 struct IPv4TcpAddress *t4;
1786 struct IPv6TcpAddress *t6;
1787 const struct sockaddr_in *s4;
1788 const struct sockaddr_in6 *s6;
1791 memcmp (&wm->clientIdentity, plugin->env->my_identity,
1792 sizeof (struct GNUNET_PeerIdentity)))
1794 /* refuse connections from ourselves */
1795 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1798 LOG (GNUNET_ERROR_TYPE_DEBUG,
1799 "Received %s message from `%4s'\n", "WELCOME",
1800 GNUNET_i2s (&wm->clientIdentity));
1801 GNUNET_STATISTICS_update (plugin->env->stats,
1802 gettext_noop ("# TCP WELCOME messages received"), 1,
1804 session = lookup_session_by_client (plugin, client);
1805 if (session != NULL)
1807 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1809 LOG (GNUNET_ERROR_TYPE_DEBUG,
1810 "Found existing session %p for peer `%s'\n",
1812 GNUNET_a2s (vaddr, alen));
1813 GNUNET_free (vaddr);
1818 GNUNET_SERVER_client_keep (client);
1819 session = create_session (plugin, &wm->clientIdentity, client, GNUNET_NO);
1820 session->inbound = GNUNET_YES;
1821 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1823 if (alen == sizeof (struct sockaddr_in))
1826 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1827 t4->t4_port = s4->sin_port;
1828 t4->ipv4_addr = s4->sin_addr.s_addr;
1830 session->addrlen = sizeof (struct IPv4TcpAddress);
1832 else if (alen == sizeof (struct sockaddr_in6))
1835 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1836 t6->t6_port = s6->sin6_port;
1837 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
1839 session->addrlen = sizeof (struct IPv6TcpAddress);
1842 struct GNUNET_ATS_Information ats;
1843 ats = plugin->env->get_address_type (plugin->env->cls, vaddr ,alen);
1844 session->ats_address_network_type = ats.value;
1846 GNUNET_free (vaddr);
1850 LOG (GNUNET_ERROR_TYPE_DEBUG,
1851 "Did not obtain TCP socket address for incoming connection\n");
1853 GNUNET_CONTAINER_multihashmap_put(plugin->sessionmap, &wm->clientIdentity.hashPubKey, session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1854 inc_sessions (plugin, session, __LINE__);
1857 if (session->expecting_welcome != GNUNET_YES)
1859 GNUNET_break_op (0);
1860 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1863 session->last_activity = GNUNET_TIME_absolute_get ();
1864 session->expecting_welcome = GNUNET_NO;
1867 process_pending_messages (session);
1869 GNUNET_SERVER_client_set_timeout (client,
1870 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1871 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1876 * Task to signal the server that we can continue
1877 * receiving from the TCP client now.
1879 * @param cls the 'struct Session*'
1880 * @param tc task context (unused)
1883 delayed_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1885 struct Session *session = cls;
1886 struct GNUNET_TIME_Relative delay;
1887 struct GNUNET_ATS_Information ats;
1889 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
1891 session->plugin->env->receive (session->plugin->env->cls,
1892 &session->target, NULL, &ats, 0, session,
1894 reschedule_session_timeout (session);
1896 if (delay.rel_value == 0)
1897 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
1899 session->receive_delay_task =
1900 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
1905 * We've received data for this peer via TCP. Unbox,
1906 * compute latency and forward.
1908 * @param cls closure
1909 * @param client identification of the client
1910 * @param message the actual message
1913 handle_tcp_data (void *cls, struct GNUNET_SERVER_Client *client,
1914 const struct GNUNET_MessageHeader *message)
1916 struct Plugin *plugin = cls;
1917 struct Session *session;
1918 struct GNUNET_TIME_Relative delay;
1921 type = ntohs (message->type);
1922 if ((GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
1923 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type))
1925 /* We don't want to propagate WELCOME and NAT Probe messages up! */
1926 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1929 session = lookup_session_by_client (plugin, client);
1930 if (NULL == session)
1932 /* No inbound session found */
1936 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
1937 LOG (GNUNET_ERROR_TYPE_ERROR,
1938 "Received unexpected %u bytes of type %u from `%s'\n",
1939 (unsigned int) ntohs (message->size),
1940 (unsigned int) ntohs (message->type),
1941 GNUNET_a2s(vaddr, alen));
1942 GNUNET_break_op (0);
1943 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1944 GNUNET_free_non_null(vaddr);
1947 else if (GNUNET_YES == session->expecting_welcome)
1949 /* Session is expecting WELCOME message */
1953 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
1954 LOG (GNUNET_ERROR_TYPE_ERROR,
1955 "Received unexpected %u bytes of type %u from `%s'\n",
1956 (unsigned int) ntohs (message->size),
1957 (unsigned int) ntohs (message->type),
1958 GNUNET_a2s(vaddr, alen));
1959 GNUNET_break_op (0);
1960 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1961 GNUNET_free_non_null(vaddr);
1965 session->last_activity = GNUNET_TIME_absolute_get ();
1966 LOG (GNUNET_ERROR_TYPE_DEBUG,
1967 "Passing %u bytes of type %u from `%4s' to transport service.\n",
1968 (unsigned int) ntohs (message->size),
1969 (unsigned int) ntohs (message->type),
1970 GNUNET_i2s (&session->target));
1972 GNUNET_STATISTICS_update (plugin->env->stats,
1973 gettext_noop ("# bytes received via TCP"),
1974 ntohs (message->size), GNUNET_NO);
1975 struct GNUNET_ATS_Information distance[2];
1977 distance[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
1978 distance[0].value = htonl (1);
1979 distance[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1980 distance[1].value = session->ats_address_network_type;
1981 GNUNET_break (ntohl(session->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
1983 GNUNET_assert (GNUNET_CONTAINER_multihashmap_contains_value (plugin->sessionmap,
1984 &session->target.hashPubKey,
1987 delay = plugin->env->receive (plugin->env->cls,
1990 (const struct GNUNET_ATS_Information *) &distance,
1992 (GNUNET_YES == session->inbound) ? NULL : session->addr,
1993 (GNUNET_YES == session->inbound) ? 0 : session->addrlen);
1995 reschedule_session_timeout (session);
1997 if (delay.rel_value == 0)
1999 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2003 LOG (GNUNET_ERROR_TYPE_DEBUG,
2004 "Throttling receiving from `%s' for %llu ms\n",
2005 GNUNET_i2s (&session->target),
2006 (unsigned long long) delay.rel_value);
2007 GNUNET_SERVER_disable_receive_done_warning (client);
2008 session->receive_delay_task =
2009 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2015 * Functions with this signature are called whenever a peer
2016 * is disconnected on the network level.
2018 * @param cls closure
2019 * @param client identification of the client
2022 disconnect_notify (void *cls, struct GNUNET_SERVER_Client *client)
2024 struct Plugin *plugin = cls;
2025 struct Session *session;
2029 plugin->max_connections++;
2030 session = lookup_session_by_client (plugin, client);
2031 if (session == NULL)
2032 return; /* unknown, nothing to do */
2033 LOG (GNUNET_ERROR_TYPE_DEBUG,
2034 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2035 GNUNET_i2s (&session->target),
2037 NULL) ? tcp_address_to_string (session->plugin,
2041 GNUNET_STATISTICS_update (session->plugin->env->stats,
2043 ("# network-level TCP disconnect events"), 1,
2045 disconnect_session (session);
2050 * We can now send a probe message, copy into buffer to really send.
2052 * @param cls closure, a struct TCPProbeContext
2053 * @param size max size to copy
2054 * @param buf buffer to copy message to
2055 * @return number of bytes copied into buf
2058 notify_send_probe (void *cls, size_t size, void *buf)
2060 struct TCPProbeContext *tcp_probe_ctx = cls;
2061 struct Plugin *plugin = tcp_probe_ctx->plugin;
2064 tcp_probe_ctx->transmit_handle = NULL;
2065 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2069 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2070 GNUNET_free (tcp_probe_ctx);
2073 GNUNET_assert (size >= sizeof (tcp_probe_ctx->message));
2074 memcpy (buf, &tcp_probe_ctx->message, sizeof (tcp_probe_ctx->message));
2075 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2076 tcp_probe_ctx->sock);
2077 ret = sizeof (tcp_probe_ctx->message);
2078 GNUNET_free (tcp_probe_ctx);
2084 * Function called by the NAT subsystem suggesting another peer wants
2085 * to connect to us via connection reversal. Try to connect back to the
2088 * @param cls closure
2089 * @param addr address to try
2090 * @param addrlen number of bytes in addr
2093 try_connection_reversal (void *cls, const struct sockaddr *addr,
2096 struct Plugin *plugin = cls;
2097 struct GNUNET_CONNECTION_Handle *sock;
2098 struct TCPProbeContext *tcp_probe_ctx;
2101 * We have received an ICMP response, ostensibly from a peer
2102 * that wants to connect to us! Send a message to establish a connection.
2104 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, addr, addrlen);
2107 /* failed for some odd reason (out of sockets?); ignore attempt */
2111 /* FIXME: do we need to track these probe context objects so that
2112 * we can clean them up on plugin unload? */
2113 tcp_probe_ctx = GNUNET_malloc (sizeof (struct TCPProbeContext));
2114 tcp_probe_ctx->message.header.size =
2115 htons (sizeof (struct TCP_NAT_ProbeMessage));
2116 tcp_probe_ctx->message.header.type =
2117 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2118 memcpy (&tcp_probe_ctx->message.clientIdentity, plugin->env->my_identity,
2119 sizeof (struct GNUNET_PeerIdentity));
2120 tcp_probe_ctx->plugin = plugin;
2121 tcp_probe_ctx->sock = sock;
2122 GNUNET_CONTAINER_DLL_insert (plugin->probe_head, plugin->probe_tail,
2124 tcp_probe_ctx->transmit_handle =
2125 GNUNET_CONNECTION_notify_transmit_ready (sock,
2126 ntohs (tcp_probe_ctx->
2127 message.header.size),
2128 GNUNET_TIME_UNIT_FOREVER_REL,
2136 * Session was idle, so disconnect it
2139 session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2141 GNUNET_assert (NULL != cls);
2142 struct Session *s = cls;
2144 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2146 "Session %p was idle for %llu, disconnecting\n",
2147 s, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
2148 /* call session destroy function */
2149 disconnect_session(s);
2154 * Start session timeout
2157 start_session_timeout (struct Session *s)
2159 GNUNET_assert (NULL != s);
2160 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
2161 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2165 "Timeout for session %p set to %llu\n",
2167 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
2172 * Increment session timeout due to activity
2175 reschedule_session_timeout (struct Session *s)
2177 GNUNET_assert (NULL != s);
2178 if (GNUNET_SCHEDULER_NO_TASK == s->timeout_task)
2180 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2181 "Timeout for peer `%s' %s not scheduled\n",
2182 GNUNET_i2s (&s->target),
2183 tcp_address_to_string(NULL, s->addr, s->addrlen));
2186 GNUNET_SCHEDULER_cancel (s->timeout_task);
2187 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Timeout rescheduled for session %p set to %llu\n",
2192 (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
2200 stop_session_timeout (struct Session *s)
2202 GNUNET_assert (NULL != s);
2203 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
2205 GNUNET_SCHEDULER_cancel (s->timeout_task);
2206 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2208 "Timeout rescheduled for session %p canceled\n",
2209 s, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
2213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2214 "Timeout for session %p was not active\n",
2221 * Entry point for the plugin.
2223 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2224 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2227 libgnunet_plugin_transport_tcp_init (void *cls)
2229 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2230 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2231 sizeof (struct WelcomeMessage)},
2232 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2233 sizeof (struct TCP_NAT_ProbeMessage)},
2234 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2237 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2238 struct GNUNET_TRANSPORT_PluginFunctions *api;
2239 struct Plugin *plugin;
2240 struct GNUNET_SERVICE_Context *service;
2241 unsigned long long aport;
2242 unsigned long long bport;
2243 unsigned long long max_connections;
2245 struct GNUNET_TIME_Relative idle_timeout;
2247 struct sockaddr **addrs;
2248 socklen_t *addrlens;
2250 if (NULL == env->receive)
2252 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2253 initialze the plugin or the API */
2254 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2256 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2257 api->address_to_string = &tcp_address_to_string;
2258 api->string_to_address = &tcp_string_to_address;
2263 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2266 max_connections = 128;
2270 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp", "PORT",
2271 &bport)) || (bport > 65535) ||
2273 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2274 "ADVERTISED-PORT", &aport)) &&
2277 LOG (GNUNET_ERROR_TYPE_ERROR,
2279 ("Require valid port number for service `%s' in configuration!\n"),
2289 service = GNUNET_SERVICE_start ("transport-tcp", env->cfg, GNUNET_SERVICE_OPTION_NONE);
2290 if (service == NULL)
2292 LOG (GNUNET_ERROR_TYPE_WARNING,
2293 _("Failed to start service.\n"));
2300 plugin = GNUNET_malloc (sizeof (struct Plugin));
2301 plugin->sessionmap = GNUNET_CONTAINER_multihashmap_create(max_connections);
2302 plugin->max_connections = max_connections;
2303 plugin->open_port = bport;
2304 plugin->adv_port = aport;
2306 plugin->lsock = NULL;
2307 if ((service != NULL) &&
2310 GNUNET_SERVICE_get_server_addresses ("transport-tcp", env->cfg, &addrs,
2314 GNUNET_NAT_register (env->cfg, GNUNET_YES, aport, (unsigned int) ret,
2315 (const struct sockaddr **) addrs, addrlens,
2316 &tcp_nat_port_map_callback,
2317 &try_connection_reversal, plugin);
2321 GNUNET_assert (addrs[ret] != NULL);
2322 GNUNET_free (addrs[ret]);
2324 GNUNET_free_non_null (addrs);
2325 GNUNET_free_non_null (addrlens);
2330 GNUNET_NAT_register (env->cfg, GNUNET_YES, 0, 0, NULL, NULL, NULL,
2331 &try_connection_reversal, plugin);
2333 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2335 api->send = &tcp_plugin_send;
2336 api->get_session = &tcp_plugin_get_session;
2338 api->disconnect = &tcp_plugin_disconnect;
2339 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2340 api->check_address = &tcp_plugin_check_address;
2341 api->address_to_string = &tcp_address_to_string;
2342 api->string_to_address = &tcp_string_to_address;
2343 plugin->service = service;
2344 if (service != NULL)
2346 plugin->server = GNUNET_SERVICE_get_server (service);
2351 GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-tcp",
2352 "TIMEOUT", &idle_timeout))
2354 LOG (GNUNET_ERROR_TYPE_ERROR,
2355 _("Failed to find option %s in section %s!\n"),
2356 "TIMEOUT", "transport-tcp");
2357 if (plugin->nat != NULL)
2358 GNUNET_NAT_unregister (plugin->nat);
2359 GNUNET_free (plugin);
2364 GNUNET_SERVER_create_with_sockets (&plugin_tcp_access_check, plugin,
2365 NULL, idle_timeout, GNUNET_YES);
2367 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2368 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2370 i < sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2372 plugin->handlers[i].callback_cls = plugin;
2373 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2374 GNUNET_SERVER_disconnect_notify (plugin->server, &disconnect_notify, plugin);
2375 plugin->nat_wait_conns = GNUNET_CONTAINER_multihashmap_create (16);
2377 LOG (GNUNET_ERROR_TYPE_INFO,
2378 _("TCP transport listening on port %llu\n"), bport);
2380 LOG (GNUNET_ERROR_TYPE_INFO,
2382 ("TCP transport not listening on any port (client only)\n"));
2384 LOG (GNUNET_ERROR_TYPE_INFO,
2386 ("TCP transport advertises itself as being on port %llu\n"),
2388 /* Initially set connections to 0 */
2389 GNUNET_STATISTICS_set(plugin->env->stats,
2390 gettext_noop ("# TCP sessions active"), 0,
2397 * Exit point from the plugin.
2400 libgnunet_plugin_transport_tcp_done (void *cls)
2402 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2403 struct Plugin *plugin = api->cls;
2404 struct TCPProbeContext *tcp_probe;
2411 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down TCP plugin\n");
2413 /* Removing leftover sessions */
2414 GNUNET_CONTAINER_multihashmap_iterate(plugin->sessionmap, &session_disconnect_it, NULL);
2415 /* Removing leftover NAT sessions */
2416 GNUNET_CONTAINER_multihashmap_iterate(plugin->nat_wait_conns, &session_disconnect_it, NULL);
2418 if (plugin->service != NULL)
2419 GNUNET_SERVICE_stop (plugin->service);
2421 GNUNET_SERVER_destroy (plugin->server);
2422 GNUNET_free (plugin->handlers);
2423 if (plugin->nat != NULL)
2424 GNUNET_NAT_unregister (plugin->nat);
2425 while (NULL != (tcp_probe = plugin->probe_head))
2427 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2429 GNUNET_CONNECTION_destroy (tcp_probe->sock);
2430 GNUNET_free (tcp_probe);
2432 GNUNET_CONTAINER_multihashmap_destroy (plugin->nat_wait_conns);
2433 GNUNET_CONTAINER_multihashmap_destroy (plugin->sessionmap);
2434 GNUNET_free (plugin);
2439 /* end of plugin_transport_tcp.c */