2 This file is part of GNUnet
3 (C) 2002--2013 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__)
44 #define PLUGIN_NAME "tcp"
47 * How long until we give up on establishing an NAT connection?
50 #define NAT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
53 GNUNET_NETWORK_STRUCT_BEGIN
58 static uint32_t myoptions;
61 * Initial handshake message for a session.
66 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
68 struct GNUNET_MessageHeader header;
71 * Identity of the node connecting (TCP client)
73 struct GNUNET_PeerIdentity clientIdentity;
79 * Basically a WELCOME message, but with the purpose
80 * of giving the waiting peer a client handle to use
82 struct TCP_NAT_ProbeMessage
85 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
87 struct GNUNET_MessageHeader header;
90 * Identity of the sender of the message.
92 struct GNUNET_PeerIdentity clientIdentity;
95 GNUNET_NETWORK_STRUCT_END
98 * Context for sending a NAT probe via TCP.
100 struct TCPProbeContext
104 * Active probes are kept in a DLL.
106 struct TCPProbeContext *next;
109 * Active probes are kept in a DLL.
111 struct TCPProbeContext *prev;
116 struct GNUNET_CONNECTION_Handle *sock;
119 * Message to be sent.
121 struct TCP_NAT_ProbeMessage message;
124 * Handle to the transmission.
126 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
129 * Transport plugin handle.
131 struct Plugin *plugin;
135 GNUNET_NETWORK_STRUCT_BEGIN
138 * Network format for IPv4 addresses.
140 struct IPv4TcpAddress
143 * Optional options and flags for this address
148 * IPv4 address, in network byte order.
150 uint32_t ipv4_addr GNUNET_PACKED;
153 * Port number, in network byte order.
155 uint16_t t4_port GNUNET_PACKED;
161 * Network format for IPv6 addresses.
163 struct IPv6TcpAddress
166 * Optional flags for this address
173 struct in6_addr ipv6_addr GNUNET_PACKED;
176 * Port number, in network byte order.
178 uint16_t t6_port GNUNET_PACKED;
181 GNUNET_NETWORK_STRUCT_END
184 * Encapsulation of all of the state of the plugin.
190 * Information kept for each message that is yet to
193 struct PendingMessage
197 * This is a doubly-linked list.
199 struct PendingMessage *next;
202 * This is a doubly-linked list.
204 struct PendingMessage *prev;
207 * The pending message
212 * Continuation function to call once the message
213 * has been sent. Can be NULL if there is no
214 * continuation to call.
216 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
219 * Closure for transmit_cont.
221 void *transmit_cont_cls;
224 * Timeout value for the pending message.
226 struct GNUNET_TIME_Absolute timeout;
229 * So that the gnunet-service-transport can group messages together,
230 * these pending messages need to accept a message buffer and size
231 * instead of just a GNUNET_MessageHeader.
239 * Session handle for TCP connections.
244 * To whom are we talking to (set to our identity
245 * if we are still waiting for the welcome message)
247 struct GNUNET_PeerIdentity target;
252 struct SessionHeader header;
255 * Pointer to the global plugin struct.
257 struct Plugin *plugin;
260 * The client (used to identify this connection)
262 struct GNUNET_SERVER_Client *client;
265 * Task cleaning up a NAT client connection establishment attempt;
267 GNUNET_SCHEDULER_TaskIdentifier nat_connection_timeout;
270 * Messages currently pending for transmission
271 * to this peer, if any.
273 struct PendingMessage *pending_messages_head;
276 * Messages currently pending for transmission
277 * to this peer, if any.
279 struct PendingMessage *pending_messages_tail;
282 * Handle for pending transmission request.
284 struct GNUNET_SERVER_TransmitHandle *transmit_handle;
287 * ID of task used to delay receiving more to throttle sender.
289 GNUNET_SCHEDULER_TaskIdentifier receive_delay_task;
292 * Session timeout task
294 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
297 * Address of the other peer (either based on our 'connect'
298 * call or on our 'accept' call).
300 * struct IPv4TcpAddress or struct IPv6TcpAddress
310 * Last activity on this connection. Used to select preferred
313 struct GNUNET_TIME_Absolute last_activity;
316 * Are we still expecting the welcome message? (#GNUNET_YES/#GNUNET_NO)
318 int expecting_welcome;
321 * Was this a connection that was inbound (we accepted)? (#GNUNET_YES/#GNUNET_NO)
326 * Was this session created using NAT traversal?
331 * ATS network type in NBO
333 uint32_t ats_address_network_type;
338 * Encapsulation of all of the state of the plugin.
345 struct GNUNET_TRANSPORT_PluginEnvironment *env;
350 struct GNUNET_CONNECTION_Handle *lsock;
353 * Our handle to the NAT module.
355 struct GNUNET_NAT_Handle *nat;
358 * Map from peer identities to sessions for the given peer.
360 struct GNUNET_CONTAINER_MultiPeerMap *sessionmap;
363 * Handle to the network service.
365 struct GNUNET_SERVICE_Context *service;
368 * Handle to the server for this service.
370 struct GNUNET_SERVER_Handle *server;
373 * Copy of the handler array where the closures are
374 * set to this struct's instance.
376 struct GNUNET_SERVER_MessageHandler *handlers;
379 * Map of peers we have tried to contact behind a NAT
381 struct GNUNET_CONTAINER_MultiPeerMap *nat_wait_conns;
384 * List of active TCP probes.
386 struct TCPProbeContext *probe_head;
389 * List of active TCP probes.
391 struct TCPProbeContext *probe_tail;
394 * Handle for (DYN)DNS lookup of our external IP.
396 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
399 * How many more TCP sessions are we allowed to open right now?
401 unsigned long long max_connections;
404 * How many more TCP sessions do we have right now?
406 unsigned long long cur_connections;
409 * ID of task used to update our addresses when one expires.
411 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
414 * Port that we are actually listening on.
419 * Port that the user said we would have visible to the
428 * Start session timeout
431 start_session_timeout (struct Session *s);
435 * Increment session timeout due to activity
438 reschedule_session_timeout (struct Session *s);
444 * @param s session to cancel timeout for
447 stop_session_timeout (struct Session *s);
452 tcp_address_to_string (void *cls, const void *addr, size_t addrlen);
455 static unsigned int sessions;
459 inc_sessions (struct Plugin *plugin, struct Session *session, int line)
462 unsigned int size = GNUNET_CONTAINER_multipeermap_size (plugin->sessionmap);
463 if (sessions != size)
464 LOG (GNUNET_ERROR_TYPE_DEBUG,
465 "Inconsistent sessions %u <-> session map size: %u\n",
467 LOG (GNUNET_ERROR_TYPE_DEBUG,
468 "%4i Session increased to %u (session map size: %u): `%s' `%s'\n",
472 GNUNET_i2s (&session->target),
473 tcp_address_to_string (NULL, session->addr, session->addrlen));
478 dec_sessions (struct Plugin *plugin,
479 struct Session *session, int line)
481 GNUNET_assert (sessions > 0);
482 unsigned int size = GNUNET_CONTAINER_multipeermap_size(plugin->sessionmap);
484 if (sessions != size)
485 LOG (GNUNET_ERROR_TYPE_DEBUG,
486 "Inconsistent sessions %u <-> session map size: %u\n",
488 LOG (GNUNET_ERROR_TYPE_DEBUG,
489 "%4i Session decreased to %u (session map size: %u): `%s' `%s'\n",
493 GNUNET_i2s (&session->target),
494 tcp_address_to_string (NULL, session->addr, session->addrlen));
500 * Function to check if an inbound connection is acceptable.
501 * Mostly used to limit the total number of open connections
504 * @param cls the 'struct Plugin'
505 * @param ucred credentials, if available, otherwise NULL
506 * @param addr address
507 * @param addrlen length of address
508 * @return #GNUNET_YES to allow, #GNUNET_NO to deny, #GNUNET_SYSERR
509 * for unknown address family (will be denied).
512 plugin_tcp_access_check (void *cls,
513 const struct GNUNET_CONNECTION_Credentials *ucred,
514 const struct sockaddr *addr, socklen_t addrlen)
516 struct Plugin *plugin = cls;
517 LOG (GNUNET_ERROR_TYPE_DEBUG,
518 "Accepting new incoming TCP connection from `%s'\n",
519 GNUNET_a2s (addr, addrlen));
520 if (plugin->cur_connections >= plugin->max_connections)
522 plugin->cur_connections ++;
528 * Our external IP address/port mapping has changed.
530 * @param cls closure, the 'struct LocalAddrList'
531 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
532 * the previous (now invalid) one
533 * @param addr either the previous or the new public IP address
534 * @param addrlen actual lenght of the address
537 tcp_nat_port_map_callback (void *cls, int add_remove,
538 const struct sockaddr *addr, socklen_t addrlen)
540 struct Plugin *plugin = cls;
541 struct IPv4TcpAddress t4;
542 struct IPv6TcpAddress t6;
546 LOG (GNUNET_ERROR_TYPE_INFO,
547 "NAT notification to %s address `%s'\n",
548 (GNUNET_YES == add_remove) ? "add" : "remove",
549 GNUNET_a2s (addr, addrlen));
550 /* convert 'addr' to our internal format */
551 switch (addr->sa_family)
554 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
555 memset (&t4,0, sizeof (t4));
556 t4.options = htonl (myoptions);
557 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
558 t4.t4_port = ((struct sockaddr_in *) addr)->sin_port;
563 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
564 memset (&t6, 0, sizeof (t6));
565 memcpy (&t6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
566 sizeof (struct in6_addr));
567 t6.options = htonl (myoptions);
568 t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
576 /* modify our published address list */
577 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args, "tcp");
582 * Function called for a quick conversion of the binary address to
583 * a numeric address. Note that the caller must not free the
584 * address and that the next call to this function is allowed
585 * to override the address again.
587 * @param cls closure ('struct Plugin*')
588 * @param addr binary address
589 * @param addrlen length of the address
590 * @return string representing the same address
593 tcp_address_to_string (void *cls, const void *addr, size_t addrlen)
595 static char rbuf[INET6_ADDRSTRLEN + 12];
596 char buf[INET6_ADDRSTRLEN];
600 const struct IPv4TcpAddress *t4;
601 const struct IPv6TcpAddress *t6;
608 case sizeof (struct IPv6TcpAddress):
611 port = ntohs (t6->t6_port);
612 options = ntohl (t6->options);
613 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
616 case sizeof (struct IPv4TcpAddress):
619 port = ntohs (t4->t4_port);
620 options = ntohl (t4->options);
621 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
626 GNUNET_snprintf (rbuf, sizeof (rbuf), "%s",
627 TRANSPORT_SESSION_INBOUND_STRING);
631 LOG (GNUNET_ERROR_TYPE_WARNING,
632 _("Unexpected address length: %u bytes\n"),
633 (unsigned int) addrlen);
636 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
638 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
641 GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u",
642 PLUGIN_NAME, options, buf, port);
648 * Function called to convert a string address to
651 * @param cls closure ('struct Plugin*')
652 * @param addr string address
653 * @param addrlen length of the address
654 * @param buf location to store the buffer
655 * @param added location to store the number of bytes in the buffer.
656 * If the function returns #GNUNET_SYSERR, its contents are undefined.
657 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
660 tcp_string_to_address (void *cls,
663 void **buf, size_t *added)
665 struct sockaddr_storage socket_address;
671 /* Format tcp.options.address:port */
675 if ((NULL == addr) || (addrlen == 0))
678 return GNUNET_SYSERR;
680 if ('\0' != addr[addrlen - 1])
683 return GNUNET_SYSERR;
685 if (strlen (addr) != addrlen - 1)
688 return GNUNET_SYSERR;
690 plugin = GNUNET_strdup (addr);
691 optionstr = strchr (plugin, '.');
692 if (NULL == optionstr)
695 GNUNET_free (plugin);
696 return GNUNET_SYSERR;
700 options = atol (optionstr);
701 address = strchr (optionstr, '.');
705 GNUNET_free (plugin);
706 return GNUNET_SYSERR;
712 GNUNET_STRINGS_to_address_ip (address, strlen (address),
716 GNUNET_free (plugin);
717 return GNUNET_SYSERR;
720 GNUNET_free (plugin);
721 switch (socket_address.ss_family)
725 struct IPv4TcpAddress *t4;
726 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
727 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
728 t4->options = htonl (options);
729 t4->ipv4_addr = in4->sin_addr.s_addr;
730 t4->t4_port = in4->sin_port;
732 *added = sizeof (struct IPv4TcpAddress);
737 struct IPv6TcpAddress *t6;
738 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
739 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
740 t6->options = htonl (options);
741 t6->ipv6_addr = in6->sin6_addr;
742 t6->t6_port = in6->sin6_port;
744 *added = sizeof (struct IPv6TcpAddress);
748 return GNUNET_SYSERR;
753 struct SessionClientCtx
755 const struct GNUNET_SERVER_Client *client;
761 session_lookup_by_client_it (void *cls,
762 const struct GNUNET_PeerIdentity *key,
765 struct SessionClientCtx *sc_ctx = cls;
766 struct Session *s = value;
768 if (s->client == sc_ctx->client)
778 * Find the session handle for the given client.
780 * @param plugin the plugin
781 * @param client which client to find the session handle for
782 * @return NULL if no matching session exists
784 static struct Session *
785 lookup_session_by_client (struct Plugin *plugin,
786 const struct GNUNET_SERVER_Client *client)
788 struct SessionClientCtx sc_ctx;
790 sc_ctx.client = client;
792 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap, &session_lookup_by_client_it, &sc_ctx);
798 * Create a new session. Also queues a welcome message.
800 * @param plugin the plugin
801 * @param target peer to connect to
802 * @param client client to use, reference counter must have already been increased
803 * @param is_nat this a NAT session, we should wait for a client to
804 * connect to us from an address, then assign that to
806 * @return new session object
808 static struct Session *
809 create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
810 struct GNUNET_SERVER_Client *client, int is_nat)
812 struct Session *session;
813 struct PendingMessage *pm;
814 struct WelcomeMessage welcome;
816 if (GNUNET_YES != is_nat)
817 GNUNET_assert (NULL != client);
819 GNUNET_assert (NULL == client);
821 LOG (GNUNET_ERROR_TYPE_DEBUG,
822 "Creating new session for peer `%4s'\n",
823 GNUNET_i2s (target));
824 session = GNUNET_malloc (sizeof (struct Session));
825 session->last_activity = GNUNET_TIME_absolute_get ();
826 session->plugin = plugin;
827 session->is_nat = is_nat;
828 session->client = client;
829 session->target = *target;
830 session->expecting_welcome = GNUNET_YES;
831 session->ats_address_network_type = htonl (GNUNET_ATS_NET_UNSPECIFIED);
832 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
833 sizeof (struct WelcomeMessage));
834 pm->msg = (const char *) &pm[1];
835 pm->message_size = sizeof (struct WelcomeMessage);
836 welcome.header.size = htons (sizeof (struct WelcomeMessage));
837 welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
838 welcome.clientIdentity = *plugin->env->my_identity;
839 memcpy (&pm[1], &welcome, sizeof (welcome));
840 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
841 GNUNET_STATISTICS_update (plugin->env->stats,
842 gettext_noop ("# bytes currently in TCP buffers"),
843 pm->message_size, GNUNET_NO);
844 GNUNET_CONTAINER_DLL_insert (session->pending_messages_head,
845 session->pending_messages_tail, pm);
846 if (GNUNET_YES != is_nat)
848 GNUNET_STATISTICS_update (plugin->env->stats,
849 gettext_noop ("# TCP sessions active"), 1,
852 start_session_timeout (session);
859 * If we have pending messages, ask the server to
860 * transmit them (schedule the respective tasks, etc.)
862 * @param session for which session should we do this
865 process_pending_messages (struct Session *session);
869 * Function called to notify a client about the socket
870 * being ready to queue more data. "buf" will be
871 * NULL and "size" zero if the socket was closed for
872 * writing in the meantime.
875 * @param size number of bytes available in buf
876 * @param buf where the callee should write the message
877 * @return number of bytes written to buf
880 do_transmit (void *cls, size_t size, void *buf)
882 struct Session *session = cls;
883 struct GNUNET_PeerIdentity pid;
884 struct Plugin *plugin;
885 struct PendingMessage *pos;
886 struct PendingMessage *hd;
887 struct PendingMessage *tl;
888 struct GNUNET_TIME_Absolute now;
892 GNUNET_assert (NULL != session);
893 session->transmit_handle = NULL;
894 plugin = session->plugin;
897 LOG (GNUNET_ERROR_TYPE_DEBUG,
898 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
899 GNUNET_i2s (&session->target));
900 /* timeout; cancel all messages that have already expired */
904 now = GNUNET_TIME_absolute_get ();
905 while ((NULL != (pos = session->pending_messages_head)) &&
906 (pos->timeout.abs_value_us <= now.abs_value_us))
908 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
909 session->pending_messages_tail, pos);
910 LOG (GNUNET_ERROR_TYPE_DEBUG,
911 "Failed to transmit %u byte message to `%4s'.\n",
912 pos->message_size, GNUNET_i2s (&session->target));
913 ret += pos->message_size;
914 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
916 /* do this call before callbacks (so that if callbacks destroy
917 * session, they have a chance to cancel actions done by this
919 process_pending_messages (session);
920 pid = session->target;
921 /* no do callbacks and do not use session again since
922 * the callbacks may abort the session */
923 while (NULL != (pos = hd))
925 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
926 if (pos->transmit_cont != NULL)
927 pos->transmit_cont (pos->transmit_cont_cls, &pid, GNUNET_SYSERR, pos->message_size, 0);
930 GNUNET_STATISTICS_update (plugin->env->stats,
931 gettext_noop ("# bytes currently in TCP buffers"),
932 -(int64_t) ret, GNUNET_NO);
933 GNUNET_STATISTICS_update (plugin->env->stats,
935 ("# bytes discarded by TCP (timeout)"), ret,
939 /* copy all pending messages that would fit */
944 while (NULL != (pos = session->pending_messages_head))
946 if (ret + pos->message_size > size)
948 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
949 session->pending_messages_tail, pos);
950 GNUNET_assert (size >= pos->message_size);
951 LOG (GNUNET_ERROR_TYPE_DEBUG,
952 "Transmitting message of type %u\n",
953 ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type));
954 /* FIXME: this memcpy can be up to 7% of our total runtime */
955 memcpy (cbuf, pos->msg, pos->message_size);
956 cbuf += pos->message_size;
957 ret += pos->message_size;
958 size -= pos->message_size;
959 GNUNET_CONTAINER_DLL_insert_tail (hd, tl, pos);
961 /* schedule 'continuation' before callbacks so that callbacks that
962 * cancel everything don't cause us to use a session that no longer
964 process_pending_messages (session);
965 session->last_activity = GNUNET_TIME_absolute_get ();
966 pid = session->target;
967 /* we'll now call callbacks that may cancel the session; hence
968 * we should not use 'session' after this point */
969 while (NULL != (pos = hd))
971 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
972 if (pos->transmit_cont != NULL)
973 pos->transmit_cont (pos->transmit_cont_cls, &pid, GNUNET_OK, pos->message_size, pos->message_size); /* FIXME: include TCP overhead */
976 GNUNET_assert (hd == NULL);
977 GNUNET_assert (tl == NULL);
978 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes\n",
980 GNUNET_STATISTICS_update (plugin->env->stats,
981 gettext_noop ("# bytes currently in TCP buffers"),
982 -(int64_t) ret, GNUNET_NO);
983 GNUNET_STATISTICS_update (plugin->env->stats,
984 gettext_noop ("# bytes transmitted via TCP"), ret,
991 * If we have pending messages, ask the server to
992 * transmit them (schedule the respective tasks, etc.)
994 * @param session for which session should we do this
997 process_pending_messages (struct Session *session)
999 struct PendingMessage *pm;
1001 GNUNET_assert (session->client != NULL);
1002 if (session->transmit_handle != NULL)
1004 if (NULL == (pm = session->pending_messages_head))
1007 session->transmit_handle =
1008 GNUNET_SERVER_notify_transmit_ready (session->client, pm->message_size,
1009 GNUNET_TIME_absolute_get_remaining
1010 (pm->timeout), &do_transmit,
1016 * Functions with this signature are called whenever we need
1017 * to close a session due to a disconnect or failure to
1018 * establish a connection.
1020 * @param cls the `struct Plugin`
1021 * @param session session to close down
1022 * @return #GNUNET_OK on success
1025 tcp_disconnect_session (void *cls,
1026 struct Session *session)
1028 struct Plugin *plugin = cls;
1029 struct PendingMessage *pm;
1031 LOG (GNUNET_ERROR_TYPE_DEBUG,
1032 "Disconnecting session of peer `%s' address `%s'\n",
1033 GNUNET_i2s (&session->target),
1034 tcp_address_to_string (NULL, session->addr, session->addrlen));
1036 stop_session_timeout (session);
1039 GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap,
1043 GNUNET_STATISTICS_update (session->plugin->env->stats,
1044 gettext_noop ("# TCP sessions active"), -1,
1046 dec_sessions (plugin, session, __LINE__);
1050 GNUNET_assert (GNUNET_YES ==
1051 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
1055 /* clean up state */
1056 if (NULL != session->transmit_handle)
1058 GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
1059 session->transmit_handle = NULL;
1061 session->plugin->env->session_end (session->plugin->env->cls,
1062 &session->target, session);
1064 if (GNUNET_SCHEDULER_NO_TASK != session->nat_connection_timeout)
1066 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
1067 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1070 while (NULL != (pm = session->pending_messages_head))
1072 LOG (GNUNET_ERROR_TYPE_DEBUG,
1073 pm->transmit_cont !=
1074 NULL ? "Could not deliver message to `%4s'.\n" :
1075 "Could not deliver message to `%4s', notifying.\n",
1076 GNUNET_i2s (&session->target));
1077 GNUNET_STATISTICS_update (session->plugin->env->stats,
1078 gettext_noop ("# bytes currently in TCP buffers"),
1079 -(int64_t) pm->message_size, GNUNET_NO);
1080 GNUNET_STATISTICS_update (session->plugin->env->stats,
1082 ("# bytes discarded by TCP (disconnect)"),
1083 pm->message_size, GNUNET_NO);
1084 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1085 session->pending_messages_tail, pm);
1086 if (NULL != pm->transmit_cont)
1087 pm->transmit_cont (pm->transmit_cont_cls, &session->target,
1088 GNUNET_SYSERR, pm->message_size, 0);
1091 if (session->receive_delay_task != GNUNET_SCHEDULER_NO_TASK)
1093 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1094 if (NULL != session->client)
1095 GNUNET_SERVER_receive_done (session->client, GNUNET_SYSERR);
1097 if (NULL != session->client)
1099 GNUNET_SERVER_client_disconnect (session->client);
1100 GNUNET_SERVER_client_drop (session->client);
1101 session->client = NULL;
1103 GNUNET_free_non_null (session->addr);
1104 GNUNET_assert (NULL == session->transmit_handle);
1105 GNUNET_free (session);
1110 struct FindSessionContext
1118 session_it (void *cls,
1119 const struct GNUNET_PeerIdentity * key,
1122 struct FindSessionContext *res = cls;
1124 if (res->s == value)
1126 res->res = GNUNET_OK;
1134 find_session (struct Plugin *plugin, struct Session *session)
1136 struct FindSessionContext session_map_res;
1137 struct FindSessionContext nat_map_res;
1139 session_map_res.s = session;
1140 session_map_res.res = GNUNET_SYSERR;
1141 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap, &session_it, &session_map_res);
1143 nat_map_res.s = session;
1144 nat_map_res.res = GNUNET_SYSERR;
1145 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns, &session_it, &nat_map_res);
1147 if ((session_map_res.res == GNUNET_SYSERR) && (nat_map_res.res == GNUNET_SYSERR))
1150 return GNUNET_SYSERR;
1157 * Function that can be used by the transport service to transmit
1158 * a message using the plugin. Note that in the case of a
1159 * peer disconnecting, the continuation MUST be called
1160 * prior to the disconnect notification itself. This function
1161 * will be called with this peer's HELLO message to initiate
1162 * a fresh connection to another peer.
1164 * @param cls closure
1165 * @param session which session must be used
1166 * @param msgbuf the message to transmit
1167 * @param msgbuf_size number of bytes in 'msgbuf'
1168 * @param priority how important is the message (most plugins will
1169 * ignore message priority and just FIFO)
1170 * @param to how long to wait at most for the transmission (does not
1171 * require plugins to discard the message after the timeout,
1172 * just advisory for the desired delay; most plugins will ignore
1174 * @param cont continuation to call once the message has
1175 * been transmitted (or if the transport is ready
1176 * for the next transmission call; or if the
1177 * peer disconnected...); can be NULL
1178 * @param cont_cls closure for @a cont
1179 * @return number of bytes used (on the physical network, with overheads);
1180 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1181 * and does NOT mean that the message was not transmitted (DV)
1184 tcp_plugin_send (void *cls,
1185 struct Session *session,
1186 const char *msgbuf, size_t msgbuf_size,
1187 unsigned int priority,
1188 struct GNUNET_TIME_Relative to,
1189 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1191 struct Plugin * plugin = cls;
1192 struct PendingMessage *pm;
1194 GNUNET_assert (NULL != plugin);
1195 GNUNET_assert (NULL != session);
1197 if (GNUNET_SYSERR == find_session(plugin, session))
1199 LOG (GNUNET_ERROR_TYPE_ERROR,
1200 _("Trying to send with invalid session %p\n"));
1201 return GNUNET_SYSERR;
1204 /* create new message entry */
1205 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1206 pm->msg = (const char *) &pm[1];
1207 memcpy (&pm[1], msgbuf, msgbuf_size);
1208 pm->message_size = msgbuf_size;
1209 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1210 pm->transmit_cont = cont;
1211 pm->transmit_cont_cls = cont_cls;
1213 LOG (GNUNET_ERROR_TYPE_DEBUG,
1214 "Asked to transmit %u bytes to `%s', added message to list.\n",
1215 msgbuf_size, GNUNET_i2s (&session->target));
1217 if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
1221 GNUNET_assert (session->client != NULL);
1222 reschedule_session_timeout (session);
1223 GNUNET_SERVER_client_set_timeout (session->client,
1224 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1225 GNUNET_STATISTICS_update (plugin->env->stats,
1226 gettext_noop ("# bytes currently in TCP buffers"),
1227 msgbuf_size, GNUNET_NO);
1229 /* append pm to pending_messages list */
1230 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1231 session->pending_messages_tail, pm);
1233 process_pending_messages (session);
1236 else if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains_value(plugin->nat_wait_conns, &session->target, session))
1238 LOG (GNUNET_ERROR_TYPE_DEBUG,
1239 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1240 GNUNET_i2s (&session->target));
1241 reschedule_session_timeout (session);
1242 GNUNET_STATISTICS_update (plugin->env->stats,
1243 gettext_noop ("# bytes currently in TCP buffers"),
1244 msgbuf_size, GNUNET_NO);
1246 /* append pm to pending_messages list */
1247 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1248 session->pending_messages_tail, pm);
1253 LOG (GNUNET_ERROR_TYPE_ERROR,
1254 "Invalid session %p\n", session);
1256 cont (cont_cls, &session->target, GNUNET_SYSERR, pm->message_size, 0);
1259 return GNUNET_SYSERR; /* session does not exist here */
1268 struct Session *result;
1273 session_lookup_it (void *cls,
1274 const struct GNUNET_PeerIdentity *key,
1277 struct SessionItCtx * si_ctx = cls;
1278 struct Session * session = value;
1280 char * a1 = strdup (tcp_address_to_string(NULL, session->addr, session->addrlen));
1281 char * a2 = strdup (tcp_address_to_string(NULL, si_ctx->addr, si_ctx->addrlen));
1282 LOG (GNUNET_ERROR_TYPE_DEBUG,
1283 "Comparing: %s %u <-> %s %u\n",
1291 if (session->addrlen != si_ctx->addrlen)
1295 if (0 != memcmp (session->addr, si_ctx->addr, si_ctx->addrlen))
1300 a1 = strdup (tcp_address_to_string(NULL, session->addr, session->addrlen));
1301 a2 = strdup (tcp_address_to_string(NULL, si_ctx->addr, si_ctx->addrlen));
1302 LOG (GNUNET_ERROR_TYPE_DEBUG,
1303 "Comparing: %s %u <-> %s %u , OK!\n",
1311 /* Found existing session */
1312 si_ctx->result = session;
1318 * Task cleaning up a NAT connection attempt after timeout
1321 nat_connect_timeout (void *cls,
1322 const struct GNUNET_SCHEDULER_TaskContext *tc)
1324 struct Session *session = cls;
1326 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1327 LOG (GNUNET_ERROR_TYPE_DEBUG,
1328 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1329 GNUNET_i2s (&session->target),
1330 tcp_address_to_string (NULL,
1331 session->addr, session->addrlen));
1332 tcp_disconnect_session (session->plugin,
1338 * Create a new session to transmit data to the target
1339 * This session will used to send data to this peer and the plugin will
1340 * notify us by calling the env->session_end function
1342 * @param cls closure
1343 * @param address pointer to the GNUNET_HELLO_Address
1344 * @return the session if the address is valid, NULL otherwise
1346 static struct Session *
1347 tcp_plugin_get_session (void *cls,
1348 const struct GNUNET_HELLO_Address *address)
1350 struct Plugin *plugin = cls;
1351 struct Session *session = NULL;
1355 struct GNUNET_CONNECTION_Handle *sa;
1356 struct sockaddr_in a4;
1357 struct sockaddr_in6 a6;
1358 const struct IPv4TcpAddress *t4;
1359 const struct IPv6TcpAddress *t6;
1360 struct GNUNET_ATS_Information ats;
1361 unsigned int is_natd = GNUNET_NO;
1364 GNUNET_assert (plugin != NULL);
1365 GNUNET_assert (address != NULL);
1366 addrlen = address->address_length;
1367 LOG (GNUNET_ERROR_TYPE_DEBUG,
1368 "Trying to get session for `%s' address of peer `%s'\n",
1369 tcp_address_to_string(NULL, address->address, address->address_length),
1370 GNUNET_i2s (&address->peer));
1372 /* look for existing session */
1374 GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
1377 struct SessionItCtx si_ctx;
1379 si_ctx.addr = (void *) address->address;
1380 si_ctx.addrlen = address->address_length;
1382 si_ctx.result = NULL;
1384 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1386 &session_lookup_it, &si_ctx);
1387 if (si_ctx.result != NULL)
1389 session = si_ctx.result;
1390 LOG (GNUNET_ERROR_TYPE_DEBUG,
1391 "Found existing session for `%s' address `%s' session %p\n",
1392 GNUNET_i2s (&address->peer),
1393 tcp_address_to_string(NULL, address->address, address->address_length),
1397 LOG (GNUNET_ERROR_TYPE_DEBUG,
1398 "Existing sessions did not match address `%s' or peer `%s'\n",
1399 tcp_address_to_string(NULL, address->address, address->address_length),
1400 GNUNET_i2s (&address->peer));
1403 if (addrlen == sizeof (struct IPv6TcpAddress))
1405 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1406 t6 = address->address;
1408 memset (&a6, 0, sizeof (a6));
1409 #if HAVE_SOCKADDR_IN_SIN_LEN
1410 a6.sin6_len = sizeof (a6);
1412 a6.sin6_family = AF_INET6;
1413 a6.sin6_port = t6->t6_port;
1414 if (t6->t6_port == 0)
1415 is_natd = GNUNET_YES;
1416 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1420 else if (addrlen == sizeof (struct IPv4TcpAddress))
1422 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1423 t4 = address->address;
1425 memset (&a4, 0, sizeof (a4));
1426 #if HAVE_SOCKADDR_IN_SIN_LEN
1427 a4.sin_len = sizeof (a4);
1429 a4.sin_family = AF_INET;
1430 a4.sin_port = t4->t4_port;
1431 if (t4->t4_port == 0)
1432 is_natd = GNUNET_YES;
1433 a4.sin_addr.s_addr = t4->ipv4_addr;
1439 GNUNET_STATISTICS_update (plugin->env->stats,
1441 ("# requests to create session with invalid address"),
1446 ats = plugin->env->get_address_type (plugin->env->cls, sb ,sbs);
1448 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1450 /* NAT client only works with IPv4 addresses */
1454 if (plugin->cur_connections >= plugin->max_connections)
1460 if ((is_natd == GNUNET_YES) &&
1462 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1465 /* Only do one NAT punch attempt per peer identity */
1469 if ((is_natd == GNUNET_YES) && (NULL != plugin->nat) &&
1471 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1474 LOG (GNUNET_ERROR_TYPE_DEBUG,
1475 "Found valid IPv4 NAT address (creating session)!\n") ;
1476 session = create_session (plugin, &address->peer, NULL, GNUNET_YES);
1477 session->addrlen = 0;
1478 session->addr = NULL;
1479 session->ats_address_network_type = ats.value;
1480 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
1481 &nat_connect_timeout,
1483 GNUNET_assert (session != NULL);
1484 GNUNET_assert (GNUNET_OK ==
1485 GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
1488 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1490 LOG (GNUNET_ERROR_TYPE_DEBUG,
1491 "Created NAT WAIT connection to `%4s' at `%s'\n",
1492 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1494 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1498 LOG (GNUNET_ERROR_TYPE_DEBUG,
1499 "Running NAT client for `%4s' at `%s' failed\n",
1500 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1501 tcp_disconnect_session (plugin, session);
1506 /* create new outbound session */
1507 GNUNET_assert (plugin->cur_connections <= plugin->max_connections);
1508 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1511 LOG (GNUNET_ERROR_TYPE_DEBUG,
1512 "Failed to create connection to `%4s' at `%s'\n",
1513 GNUNET_i2s (&address->peer), GNUNET_a2s (sb, sbs));
1516 plugin->cur_connections++;
1517 if (plugin->cur_connections == plugin->max_connections)
1518 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
1520 LOG (GNUNET_ERROR_TYPE_DEBUG,
1521 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1522 GNUNET_i2s (&address->peer), GNUNET_a2s (sb, sbs));
1524 session = create_session (plugin,
1526 GNUNET_SERVER_connect_socket (plugin->server, sa),
1528 session->addr = GNUNET_malloc (addrlen);
1529 memcpy (session->addr, address->address, addrlen);
1530 session->addrlen = addrlen;
1531 session->ats_address_network_type = ats.value;
1533 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1535 session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1536 inc_sessions (plugin, session, __LINE__);
1537 LOG (GNUNET_ERROR_TYPE_DEBUG,
1538 "Creating new session for `%s' address `%s' session %p\n",
1539 GNUNET_i2s (&address->peer),
1540 tcp_address_to_string(NULL, address->address, address->address_length),
1542 /* Send TCP Welcome */
1543 process_pending_messages (session);
1550 session_disconnect_it (void *cls,
1551 const struct GNUNET_PeerIdentity *key,
1554 struct Plugin *plugin = cls;
1555 struct Session *session = value;
1557 GNUNET_STATISTICS_update (session->plugin->env->stats,
1559 ("# transport-service disconnect requests for TCP"),
1561 tcp_disconnect_session (plugin,
1568 * Function that can be called to force a disconnect from the
1569 * specified neighbour. This should also cancel all previously
1570 * scheduled transmissions. Obviously the transmission may have been
1571 * partially completed already, which is OK. The plugin is supposed
1572 * to close the connection (if applicable) and no longer call the
1573 * transmit continuation(s).
1575 * Finally, plugin MUST NOT call the services's receive function to
1576 * notify the service that the connection to the specified target was
1577 * closed after a getting this call.
1579 * @param cls closure
1580 * @param target peer for which the last transmission is
1584 tcp_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
1586 struct Plugin *plugin = cls;
1588 LOG (GNUNET_ERROR_TYPE_DEBUG,
1589 "Disconnecting peer `%4s'\n", GNUNET_i2s (target));
1590 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap, target,
1591 &session_disconnect_it, plugin);
1592 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns, target,
1593 &session_disconnect_it, plugin);
1598 * Running pretty printers: head
1600 static struct PrettyPrinterContext *ppc_dll_head;
1603 * Running pretty printers: tail
1605 static struct PrettyPrinterContext *ppc_dll_tail;
1608 * Context for address to string conversion.
1610 struct PrettyPrinterContext
1615 struct PrettyPrinterContext *next;
1620 struct PrettyPrinterContext *prev;
1625 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
1630 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
1633 * Function to call with the result.
1635 GNUNET_TRANSPORT_AddressStringCallback asc;
1638 * Clsoure for 'asc'.
1643 * Port to add after the IP address.
1660 ppc_cancel_task (void *cls,
1661 const struct GNUNET_SCHEDULER_TaskContext *tc)
1664 struct PrettyPrinterContext *ppc = cls;
1665 struct PrettyPrinterContext *cur;
1667 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1673 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Cancel request %p, %u pending\n", ppc, count);
1674 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1675 if (NULL != ppc->resolver_handle)
1677 GNUNET_RESOLVER_request_cancel (ppc->resolver_handle);
1678 ppc->resolver_handle = NULL;
1680 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, ppc);
1686 * Append our port and forward the result.
1688 * @param cls the 'struct PrettyPrinterContext*'
1689 * @param hostname hostname part of the address
1692 append_port (void *cls, const char *hostname)
1694 struct PrettyPrinterContext *ppc = cls;
1695 struct PrettyPrinterContext *cur;
1699 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1704 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Callback request %p == %s, %u pending\n", ppc, hostname, count);
1705 if (hostname == NULL)
1707 ppc->asc (ppc->asc_cls, NULL);
1708 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, ppc);
1709 GNUNET_SCHEDULER_cancel (ppc->timeout_task);
1710 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1711 ppc->resolver_handle = NULL;
1712 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Done request %p, %u pending\n", ppc, count);
1716 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1723 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Invalid callback for PPC %p \n", ppc);
1727 if (GNUNET_YES == ppc->ipv6)
1728 GNUNET_asprintf (&ret, "%s.%u.[%s]:%d", PLUGIN_NAME, ppc->options, hostname, ppc->port);
1730 GNUNET_asprintf (&ret, "%s.%u.%s:%d", PLUGIN_NAME, ppc->options, hostname, ppc->port);
1731 ppc->asc (ppc->asc_cls, ret);
1737 * Convert the transports address to a nice, human-readable
1740 * @param cls closure
1741 * @param type name of the transport that generated the address
1742 * @param addr one of the addresses of the host, NULL for the last address
1743 * the specific address format depends on the transport
1744 * @param addrlen length of the address
1745 * @param numeric should (IP) addresses be displayed in numeric form?
1746 * @param timeout after how long should we give up?
1747 * @param asc function to call on each string
1748 * @param asc_cls closure for asc
1751 tcp_plugin_address_pretty_printer (void *cls, const char *type,
1752 const void *addr, size_t addrlen,
1754 struct GNUNET_TIME_Relative timeout,
1755 GNUNET_TRANSPORT_AddressStringCallback asc,
1758 struct PrettyPrinterContext *ppc;
1761 struct sockaddr_in a4;
1762 struct sockaddr_in6 a6;
1763 const struct IPv4TcpAddress *t4;
1764 const struct IPv6TcpAddress *t6;
1768 if (addrlen == sizeof (struct IPv6TcpAddress))
1771 memset (&a6, 0, sizeof (a6));
1772 a6.sin6_family = AF_INET6;
1773 a6.sin6_port = t6->t6_port;
1774 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1775 port = ntohs (t6->t6_port);
1776 options = ntohl (t6->options);
1780 else if (addrlen == sizeof (struct IPv4TcpAddress))
1783 memset (&a4, 0, sizeof (a4));
1784 a4.sin_family = AF_INET;
1785 a4.sin_port = t4->t4_port;
1786 a4.sin_addr.s_addr = t4->ipv4_addr;
1787 port = ntohs (t4->t4_port);
1788 options = ntohl (t4->options);
1792 else if (0 == addrlen)
1794 asc (asc_cls, TRANSPORT_SESSION_INBOUND_STRING);
1795 asc (asc_cls, NULL);
1800 /* invalid address */
1801 GNUNET_break_op (0);
1802 asc (asc_cls, NULL);
1805 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1806 if (addrlen == sizeof (struct IPv6TcpAddress))
1807 ppc->ipv6 = GNUNET_YES;
1809 ppc->ipv6 = GNUNET_NO;
1811 ppc->asc_cls = asc_cls;
1813 ppc->options = options;
1814 ppc->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(timeout, 2),
1815 &ppc_cancel_task, ppc);
1816 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric,
1819 if (NULL != ppc->resolver_handle)
1821 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Adding request %p\n", ppc);
1822 GNUNET_CONTAINER_DLL_insert (ppc_dll_head, ppc_dll_tail, ppc);
1833 * Check if the given port is plausible (must be either our listen
1834 * port or our advertised port), or any port if we are behind NAT
1835 * and do not have a port open. If it is neither, we return
1838 * @param plugin global variables
1839 * @param in_port port number to check
1840 * @return GNUNET_OK if port is either open_port or adv_port
1843 check_port (struct Plugin *plugin, uint16_t in_port)
1845 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1847 return GNUNET_SYSERR;
1852 * Function that will be called to check if a binary address for this
1853 * plugin is well-formed and corresponds to an address for THIS peer
1854 * (as per our configuration). Naturally, if absolutely necessary,
1855 * plugins can be a bit conservative in their answer, but in general
1856 * plugins should make sure that the address does not redirect
1857 * traffic to a 3rd party that might try to man-in-the-middle our
1860 * @param cls closure, our 'struct Plugin*'
1861 * @param addr pointer to the address
1862 * @param addrlen length of addr
1863 * @return GNUNET_OK if this is a plausible address for this peer
1864 * and transport, GNUNET_SYSERR if not
1867 tcp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1869 struct Plugin *plugin = cls;
1870 struct IPv4TcpAddress *v4;
1871 struct IPv6TcpAddress *v6;
1873 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1874 (addrlen != sizeof (struct IPv6TcpAddress)))
1878 return GNUNET_SYSERR;
1881 if (addrlen == sizeof (struct IPv4TcpAddress))
1883 v4 = (struct IPv4TcpAddress *) addr;
1884 if (0 != memcmp (&v4->options, &myoptions, sizeof (myoptions)))
1887 return GNUNET_SYSERR;
1889 if (GNUNET_OK != check_port (plugin, ntohs (v4->t4_port)))
1890 return GNUNET_SYSERR;
1892 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1893 sizeof (struct in_addr)))
1894 return GNUNET_SYSERR;
1898 v6 = (struct IPv6TcpAddress *) addr;
1899 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1901 GNUNET_break_op (0);
1902 return GNUNET_SYSERR;
1904 if (0 != memcmp (&v6->options, &myoptions, sizeof (myoptions)))
1907 return GNUNET_SYSERR;
1909 if (GNUNET_OK != check_port (plugin, ntohs (v6->t6_port)))
1910 return GNUNET_SYSERR;
1912 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1913 sizeof (struct in6_addr)))
1914 return GNUNET_SYSERR;
1921 * We've received a nat probe from this peer via TCP. Finish
1922 * creating the client session and resume sending of queued
1925 * @param cls closure
1926 * @param client identification of the client
1927 * @param message the actual message
1930 handle_tcp_nat_probe (void *cls, struct GNUNET_SERVER_Client *client,
1931 const struct GNUNET_MessageHeader *message)
1933 struct Plugin *plugin = cls;
1934 struct Session *session;
1935 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1938 struct IPv4TcpAddress *t4;
1939 struct IPv6TcpAddress *t6;
1940 const struct sockaddr_in *s4;
1941 const struct sockaddr_in6 *s6;
1943 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NAT probe\n");
1945 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1946 * a connection to this peer by running gnunet-nat-client. This peer
1947 * received the punch message and now wants us to use the new connection
1948 * as the default for that peer. Do so and then send a WELCOME message
1949 * so we can really be connected!
1951 if (ntohs (message->size) != sizeof (struct TCP_NAT_ProbeMessage))
1953 GNUNET_break_op (0);
1954 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1958 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
1960 memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
1961 sizeof (struct GNUNET_PeerIdentity)))
1963 /* refuse connections from ourselves */
1964 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1969 GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
1972 if (session == NULL)
1974 LOG (GNUNET_ERROR_TYPE_DEBUG,
1975 "Did NOT find session for NAT probe!\n");
1976 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1979 LOG (GNUNET_ERROR_TYPE_DEBUG,
1980 "Found session for NAT probe!\n");
1982 if (session->nat_connection_timeout != GNUNET_SCHEDULER_NO_TASK)
1984 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
1985 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1988 if (GNUNET_OK != GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1991 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1992 tcp_disconnect_session (plugin, session);
1995 GNUNET_assert (GNUNET_CONTAINER_multipeermap_remove
1996 (plugin->nat_wait_conns,
1997 &tcp_nat_probe->clientIdentity,
1998 session) == GNUNET_YES);
1999 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2000 &session->target, session,
2001 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2002 session->last_activity = GNUNET_TIME_absolute_get ();
2003 session->inbound = GNUNET_NO;
2004 LOG (GNUNET_ERROR_TYPE_DEBUG,
2005 "Found address `%s' for incoming connection\n",
2006 GNUNET_a2s (vaddr, alen));
2007 switch (((const struct sockaddr *) vaddr)->sa_family)
2011 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
2013 t4->t4_port = s4->sin_port;
2014 t4->ipv4_addr = s4->sin_addr.s_addr;
2016 session->addrlen = sizeof (struct IPv4TcpAddress);
2020 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
2022 t6->t6_port = s6->sin6_port;
2023 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
2025 session->addrlen = sizeof (struct IPv6TcpAddress);
2028 GNUNET_break_op (0);
2029 LOG (GNUNET_ERROR_TYPE_DEBUG,
2030 "Bad address for incoming connection!\n");
2031 GNUNET_free (vaddr);
2032 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2033 tcp_disconnect_session (plugin, session);
2036 GNUNET_free (vaddr);
2037 GNUNET_break (NULL == session->client);
2038 GNUNET_SERVER_client_keep (client);
2039 session->client = client;
2040 inc_sessions (plugin, session, __LINE__);
2041 GNUNET_STATISTICS_update (plugin->env->stats,
2042 gettext_noop ("# TCP sessions active"), 1,
2044 process_pending_messages (session);
2045 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2050 * We've received a welcome from this peer via TCP. Possibly create a
2051 * fresh client record and send back our welcome.
2053 * @param cls closure
2054 * @param client identification of the client
2055 * @param message the actual message
2058 handle_tcp_welcome (void *cls, struct GNUNET_SERVER_Client *client,
2059 const struct GNUNET_MessageHeader *message)
2061 struct Plugin *plugin = cls;
2062 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2063 struct Session *session;
2066 struct IPv4TcpAddress *t4;
2067 struct IPv6TcpAddress *t6;
2068 const struct sockaddr_in *s4;
2069 const struct sockaddr_in6 *s6;
2070 struct GNUNET_ATS_Information ats;
2073 memcmp (&wm->clientIdentity, plugin->env->my_identity,
2074 sizeof (struct GNUNET_PeerIdentity)))
2076 /* refuse connections from ourselves */
2077 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2078 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2080 LOG (GNUNET_ERROR_TYPE_WARNING,
2081 "Received %s message from my own identity `%4s' on address `%s'\n",
2082 "WELCOME", GNUNET_i2s (&wm->clientIdentity), GNUNET_a2s (vaddr, alen));
2083 GNUNET_free (vaddr);
2085 GNUNET_break_op (0);
2088 LOG (GNUNET_ERROR_TYPE_DEBUG,
2089 "Received %s message from `%4s' %p\n", "WELCOME",
2090 GNUNET_i2s (&wm->clientIdentity), client);
2091 GNUNET_STATISTICS_update (plugin->env->stats,
2092 gettext_noop ("# TCP WELCOME messages received"), 1,
2094 session = lookup_session_by_client (plugin, client);
2095 if (session != NULL)
2097 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2099 LOG (GNUNET_ERROR_TYPE_DEBUG,
2100 "Found existing session %p for peer `%s'\n",
2102 GNUNET_a2s (vaddr, alen));
2103 GNUNET_free (vaddr);
2108 GNUNET_SERVER_client_keep (client);
2109 if (plugin->service != NULL) /* Otherwise value is incremented in tcp_access_check */
2110 plugin->cur_connections++;
2111 if (plugin->cur_connections == plugin->max_connections)
2112 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2114 session = create_session (plugin, &wm->clientIdentity, client, GNUNET_NO);
2115 session->inbound = GNUNET_YES;
2116 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2118 if (alen == sizeof (struct sockaddr_in))
2121 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
2122 t4->options = htonl (0);
2123 t4->t4_port = s4->sin_port;
2124 t4->ipv4_addr = s4->sin_addr.s_addr;
2126 session->addrlen = sizeof (struct IPv4TcpAddress);
2128 else if (alen == sizeof (struct sockaddr_in6))
2131 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
2132 t6->options = htonl (0);
2133 t6->t6_port = s6->sin6_port;
2134 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
2136 session->addrlen = sizeof (struct IPv6TcpAddress);
2139 ats = plugin->env->get_address_type (plugin->env->cls, vaddr ,alen);
2140 session->ats_address_network_type = ats.value;
2141 LOG (GNUNET_ERROR_TYPE_DEBUG,
2142 "Creating new session %p for peer `%s'\n",
2144 GNUNET_a2s (vaddr, alen));
2145 GNUNET_free (vaddr);
2146 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2149 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2150 inc_sessions (plugin, session, __LINE__);
2154 LOG (GNUNET_ERROR_TYPE_DEBUG,
2155 "Did not obtain TCP socket address for incoming connection\n");
2160 if (session->expecting_welcome != GNUNET_YES)
2162 GNUNET_break_op (0);
2163 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2167 session->last_activity = GNUNET_TIME_absolute_get ();
2168 session->expecting_welcome = GNUNET_NO;
2170 /* Notify transport and ATS about new session */
2171 if (GNUNET_YES == session->inbound)
2173 plugin->env->session_start (NULL, &wm->clientIdentity, PLUGIN_NAME,
2174 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2175 (GNUNET_YES == session->inbound) ? 0 : session->addrlen,
2179 process_pending_messages (session);
2181 GNUNET_SERVER_client_set_timeout (client,
2182 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2183 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2188 * Task to signal the server that we can continue
2189 * receiving from the TCP client now.
2191 * @param cls the 'struct Session*'
2192 * @param tc task context (unused)
2195 delayed_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2197 struct Session *session = cls;
2199 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
2200 reschedule_session_timeout (session);
2202 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
2207 * We've received data for this peer via TCP. Unbox,
2208 * compute latency and forward.
2210 * @param cls closure
2211 * @param client identification of the client
2212 * @param message the actual message
2215 handle_tcp_data (void *cls, struct GNUNET_SERVER_Client *client,
2216 const struct GNUNET_MessageHeader *message)
2218 struct Plugin *plugin = cls;
2219 struct Session *session;
2220 struct GNUNET_TIME_Relative delay;
2223 type = ntohs (message->type);
2224 if ((GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2225 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type))
2227 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2228 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2231 session = lookup_session_by_client (plugin, client);
2232 if (NULL == session)
2234 /* No inbound session found */
2238 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2239 LOG (GNUNET_ERROR_TYPE_ERROR,
2240 "Received unexpected %u bytes of type %u from `%s'\n",
2241 (unsigned int) ntohs (message->size),
2242 (unsigned int) ntohs (message->type),
2243 GNUNET_a2s(vaddr, alen));
2244 GNUNET_break_op (0);
2245 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2246 GNUNET_free_non_null(vaddr);
2249 else if (GNUNET_YES == session->expecting_welcome)
2251 /* Session is expecting WELCOME message */
2255 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2256 LOG (GNUNET_ERROR_TYPE_ERROR,
2257 "Received unexpected %u bytes of type %u from `%s'\n",
2258 (unsigned int) ntohs (message->size),
2259 (unsigned int) ntohs (message->type),
2260 GNUNET_a2s(vaddr, alen));
2261 GNUNET_break_op (0);
2262 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2263 GNUNET_free_non_null(vaddr);
2267 session->last_activity = GNUNET_TIME_absolute_get ();
2268 LOG (GNUNET_ERROR_TYPE_DEBUG,
2269 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2270 (unsigned int) ntohs (message->size),
2271 (unsigned int) ntohs (message->type),
2272 GNUNET_i2s (&session->target));
2274 GNUNET_STATISTICS_update (plugin->env->stats,
2275 gettext_noop ("# bytes received via TCP"),
2276 ntohs (message->size), GNUNET_NO);
2277 struct GNUNET_ATS_Information distance;
2279 distance.type = htonl (GNUNET_ATS_NETWORK_TYPE);
2280 distance.value = session->ats_address_network_type;
2281 GNUNET_break (ntohl(session->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
2283 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2287 delay = plugin->env->receive (plugin->env->cls,
2291 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2292 (GNUNET_YES == session->inbound) ? 0 : session->addrlen);
2293 plugin->env->update_address_metrics (plugin->env->cls,
2295 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2296 (GNUNET_YES == session->inbound) ? 0 : session->addrlen,
2297 session, &distance, 1);
2299 reschedule_session_timeout (session);
2301 if (0 == delay.rel_value_us)
2303 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2307 LOG (GNUNET_ERROR_TYPE_DEBUG,
2308 "Throttling receiving from `%s' for %s\n",
2309 GNUNET_i2s (&session->target),
2310 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
2311 GNUNET_SERVER_disable_receive_done_warning (client);
2312 session->receive_delay_task =
2313 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2319 * Functions with this signature are called whenever a peer
2320 * is disconnected on the network level.
2322 * @param cls closure
2323 * @param client identification of the client
2326 disconnect_notify (void *cls, struct GNUNET_SERVER_Client *client)
2328 struct Plugin *plugin = cls;
2329 struct Session *session;
2333 session = lookup_session_by_client (plugin, client);
2334 if (session == NULL)
2335 return; /* unknown, nothing to do */
2336 LOG (GNUNET_ERROR_TYPE_DEBUG,
2337 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2338 GNUNET_i2s (&session->target),
2340 NULL) ? tcp_address_to_string (session->plugin,
2345 if (plugin->cur_connections == plugin->max_connections)
2346 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2348 if (plugin->cur_connections < 1)
2351 plugin->cur_connections--;
2353 GNUNET_STATISTICS_update (session->plugin->env->stats,
2355 ("# network-level TCP disconnect events"), 1,
2357 tcp_disconnect_session (plugin, session);
2362 * We can now send a probe message, copy into buffer to really send.
2364 * @param cls closure, a struct TCPProbeContext
2365 * @param size max size to copy
2366 * @param buf buffer to copy message to
2367 * @return number of bytes copied into buf
2370 notify_send_probe (void *cls, size_t size, void *buf)
2372 struct TCPProbeContext *tcp_probe_ctx = cls;
2373 struct Plugin *plugin = tcp_probe_ctx->plugin;
2376 tcp_probe_ctx->transmit_handle = NULL;
2377 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2381 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2382 GNUNET_free (tcp_probe_ctx);
2385 GNUNET_assert (size >= sizeof (tcp_probe_ctx->message));
2386 memcpy (buf, &tcp_probe_ctx->message, sizeof (tcp_probe_ctx->message));
2387 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2388 tcp_probe_ctx->sock);
2389 ret = sizeof (tcp_probe_ctx->message);
2390 GNUNET_free (tcp_probe_ctx);
2396 * Function called by the NAT subsystem suggesting another peer wants
2397 * to connect to us via connection reversal. Try to connect back to the
2400 * @param cls closure
2401 * @param addr address to try
2402 * @param addrlen number of bytes in @a addr
2405 try_connection_reversal (void *cls, const struct sockaddr *addr,
2408 struct Plugin *plugin = cls;
2409 struct GNUNET_CONNECTION_Handle *sock;
2410 struct TCPProbeContext *tcp_probe_ctx;
2413 * We have received an ICMP response, ostensibly from a peer
2414 * that wants to connect to us! Send a message to establish a connection.
2416 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, addr, addrlen);
2419 /* failed for some odd reason (out of sockets?); ignore attempt */
2423 /* FIXME: do we need to track these probe context objects so that
2424 * we can clean them up on plugin unload? */
2425 tcp_probe_ctx = GNUNET_malloc (sizeof (struct TCPProbeContext));
2426 tcp_probe_ctx->message.header.size =
2427 htons (sizeof (struct TCP_NAT_ProbeMessage));
2428 tcp_probe_ctx->message.header.type =
2429 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2430 memcpy (&tcp_probe_ctx->message.clientIdentity, plugin->env->my_identity,
2431 sizeof (struct GNUNET_PeerIdentity));
2432 tcp_probe_ctx->plugin = plugin;
2433 tcp_probe_ctx->sock = sock;
2434 GNUNET_CONTAINER_DLL_insert (plugin->probe_head, plugin->probe_tail,
2436 tcp_probe_ctx->transmit_handle =
2437 GNUNET_CONNECTION_notify_transmit_ready (sock,
2438 ntohs (tcp_probe_ctx->
2439 message.header.size),
2440 GNUNET_TIME_UNIT_FOREVER_REL,
2448 * Session was idle, so disconnect it
2451 session_timeout (void *cls,
2452 const struct GNUNET_SCHEDULER_TaskContext *tc)
2454 struct Session *s = cls;
2456 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2458 "Session %p was idle for %s, disconnecting\n",
2460 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2462 /* call session destroy function */
2463 tcp_disconnect_session(s->plugin, s);
2468 * Start session timeout
2471 start_session_timeout (struct Session *s)
2473 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
2474 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2478 "Timeout for session %p set to %s\n",
2480 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2486 * Increment session timeout due to activity
2489 reschedule_session_timeout (struct Session *s)
2491 GNUNET_assert (NULL != s);
2492 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
2494 GNUNET_SCHEDULER_cancel (s->timeout_task);
2495 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2499 "Timeout rescheduled for session %p set to %s\n",
2501 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2509 * @param s session to cancel timeout for
2512 stop_session_timeout (struct Session *s)
2514 GNUNET_assert (NULL != s);
2516 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
2518 GNUNET_SCHEDULER_cancel (s->timeout_task);
2519 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2521 "Timeout stopped for session %p canceled\n",
2527 * Function obtain the network type for a session
2529 * @param cls closure ('struct Plugin*')
2530 * @param session the session
2531 * @return the network type in HBO or GNUNET_SYSERR
2533 static enum GNUNET_ATS_Network_Type
2534 tcp_get_network (void *cls,
2535 struct Session *session)
2537 GNUNET_assert (NULL != session);
2538 return ntohl (session->ats_address_network_type);
2543 * Entry point for the plugin.
2545 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2546 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2549 libgnunet_plugin_transport_tcp_init (void *cls)
2551 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2552 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2553 sizeof (struct WelcomeMessage)},
2554 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2555 sizeof (struct TCP_NAT_ProbeMessage)},
2556 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2559 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2560 struct GNUNET_TRANSPORT_PluginFunctions *api;
2561 struct Plugin *plugin;
2562 struct GNUNET_SERVICE_Context *service;
2563 unsigned long long aport;
2564 unsigned long long bport;
2565 unsigned long long max_connections;
2567 struct GNUNET_TIME_Relative idle_timeout;
2570 struct sockaddr **addrs;
2571 socklen_t *addrlens;
2574 if (NULL == env->receive)
2576 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2577 initialze the plugin or the API */
2578 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2580 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2581 api->address_to_string = &tcp_address_to_string;
2582 api->string_to_address = &tcp_string_to_address;
2586 GNUNET_assert (NULL != env->cfg);
2588 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2591 max_connections = 128;
2595 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp", "PORT",
2596 &bport)) || (bport > 65535) ||
2598 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2599 "ADVERTISED-PORT", &aport)) &&
2602 LOG (GNUNET_ERROR_TYPE_ERROR,
2603 _("Require valid port number for service `%s' in configuration!\n"),
2613 service = GNUNET_SERVICE_start ("transport-tcp", env->cfg, GNUNET_SERVICE_OPTION_NONE);
2614 if (service == NULL)
2616 LOG (GNUNET_ERROR_TYPE_WARNING,
2617 _("Failed to start service.\n"));
2624 /* Initialize my flags */
2627 plugin = GNUNET_new (struct Plugin);
2628 plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections, GNUNET_YES);
2629 plugin->max_connections = max_connections;
2630 plugin->cur_connections = 0;
2631 plugin->open_port = bport;
2632 plugin->adv_port = aport;
2634 plugin->lsock = NULL;
2635 if ((service != NULL) &&
2638 GNUNET_SERVICE_get_server_addresses ("transport-tcp", env->cfg, &addrs,
2641 for (ret = ret_s-1; ret >= 0; ret--)
2642 LOG (GNUNET_ERROR_TYPE_INFO,
2643 "Binding to address `%s'\n",
2644 GNUNET_a2s (addrs[ret], addrlens[ret]));
2646 GNUNET_NAT_register (env->cfg, GNUNET_YES, aport, (unsigned int) ret_s,
2647 (const struct sockaddr **) addrs, addrlens,
2648 &tcp_nat_port_map_callback,
2649 &try_connection_reversal, plugin);
2650 for (ret = ret_s -1; ret >= 0; ret--)
2652 GNUNET_assert (addrs[ret] != NULL);
2653 GNUNET_free (addrs[ret]);
2655 GNUNET_free_non_null (addrs);
2656 GNUNET_free_non_null (addrlens);
2660 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2661 GNUNET_YES, 0, 0, NULL, NULL, NULL,
2662 &try_connection_reversal, plugin);
2664 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2666 api->send = &tcp_plugin_send;
2667 api->get_session = &tcp_plugin_get_session;
2669 api->disconnect_session = &tcp_disconnect_session;
2670 api->disconnect_peer = &tcp_plugin_disconnect;
2671 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2672 api->check_address = &tcp_plugin_check_address;
2673 api->address_to_string = &tcp_address_to_string;
2674 api->string_to_address = &tcp_string_to_address;
2675 api->get_network = &tcp_get_network;
2676 plugin->service = service;
2677 if (NULL != service)
2679 plugin->server = GNUNET_SERVICE_get_server (service);
2684 GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-tcp",
2685 "TIMEOUT", &idle_timeout))
2687 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2688 "transport-tcp", "TIMEOUT");
2689 if (plugin->nat != NULL)
2690 GNUNET_NAT_unregister (plugin->nat);
2691 GNUNET_free (plugin);
2696 GNUNET_SERVER_create_with_sockets (&plugin_tcp_access_check, plugin,
2697 NULL, idle_timeout, GNUNET_YES);
2699 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2700 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2702 i < sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2704 plugin->handlers[i].callback_cls = plugin;
2706 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2707 GNUNET_SERVER_disconnect_notify (plugin->server, &disconnect_notify, plugin);
2708 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16, GNUNET_YES);
2710 LOG (GNUNET_ERROR_TYPE_INFO,
2711 _("TCP transport listening on port %llu\n"), bport);
2713 LOG (GNUNET_ERROR_TYPE_INFO,
2714 _("TCP transport not listening on any port (client only)\n"));
2716 LOG (GNUNET_ERROR_TYPE_INFO,
2717 _("TCP transport advertises itself as being on port %llu\n"),
2719 /* Initially set connections to 0 */
2720 GNUNET_assert (NULL != plugin->env->stats);
2721 GNUNET_STATISTICS_set (plugin->env->stats,
2722 gettext_noop ("# TCP sessions active"), 0,
2729 * Exit point from the plugin.
2732 libgnunet_plugin_transport_tcp_done (void *cls)
2734 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2735 struct Plugin *plugin = api->cls;
2736 struct TCPProbeContext *tcp_probe;
2737 struct PrettyPrinterContext *cur;
2738 struct PrettyPrinterContext *next;
2745 LOG (GNUNET_ERROR_TYPE_DEBUG,
2746 "Shutting down TCP plugin\n");
2748 /* Removing leftover sessions */
2749 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2750 &session_disconnect_it, plugin);
2751 /* Removing leftover NAT sessions */
2752 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
2753 &session_disconnect_it, plugin);
2755 next = ppc_dll_head;
2756 for (cur = next; NULL != cur; cur = next)
2759 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, cur);
2760 if (NULL != cur->resolver_handle)
2761 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
2762 GNUNET_SCHEDULER_cancel (cur->timeout_task);
2767 if (plugin->service != NULL)
2768 GNUNET_SERVICE_stop (plugin->service);
2770 GNUNET_SERVER_destroy (plugin->server);
2771 GNUNET_free (plugin->handlers);
2772 if (plugin->nat != NULL)
2773 GNUNET_NAT_unregister (plugin->nat);
2774 while (NULL != (tcp_probe = plugin->probe_head))
2776 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2778 GNUNET_CONNECTION_destroy (tcp_probe->sock);
2779 GNUNET_free (tcp_probe);
2781 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
2782 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
2783 GNUNET_free (plugin);
2788 /* end of plugin_transport_tcp.c */