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 session session to close down
1021 * @return #GNUNET_OK on success
1024 tcp_disconnect_session (void *cls,
1025 struct Session *session)
1027 struct Plugin *plugin = cls;
1028 struct PendingMessage *pm;
1030 LOG (GNUNET_ERROR_TYPE_DEBUG,
1031 "Disconnecting session of peer `%s' address `%s'\n",
1032 GNUNET_i2s (&session->target),
1033 tcp_address_to_string (NULL, session->addr, session->addrlen));
1035 stop_session_timeout (session);
1038 GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap,
1042 GNUNET_STATISTICS_update (session->plugin->env->stats,
1043 gettext_noop ("# TCP sessions active"), -1,
1045 dec_sessions (plugin, session, __LINE__);
1049 GNUNET_assert (GNUNET_YES ==
1050 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
1054 /* clean up state */
1055 if (NULL != session->transmit_handle)
1057 GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
1058 session->transmit_handle = NULL;
1060 session->plugin->env->session_end (session->plugin->env->cls,
1061 &session->target, session);
1063 if (GNUNET_SCHEDULER_NO_TASK != session->nat_connection_timeout)
1065 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
1066 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1069 while (NULL != (pm = session->pending_messages_head))
1071 LOG (GNUNET_ERROR_TYPE_DEBUG,
1072 pm->transmit_cont !=
1073 NULL ? "Could not deliver message to `%4s'.\n" :
1074 "Could not deliver message to `%4s', notifying.\n",
1075 GNUNET_i2s (&session->target));
1076 GNUNET_STATISTICS_update (session->plugin->env->stats,
1077 gettext_noop ("# bytes currently in TCP buffers"),
1078 -(int64_t) pm->message_size, GNUNET_NO);
1079 GNUNET_STATISTICS_update (session->plugin->env->stats,
1081 ("# bytes discarded by TCP (disconnect)"),
1082 pm->message_size, GNUNET_NO);
1083 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1084 session->pending_messages_tail, pm);
1085 if (NULL != pm->transmit_cont)
1086 pm->transmit_cont (pm->transmit_cont_cls, &session->target,
1087 GNUNET_SYSERR, pm->message_size, 0);
1090 if (session->receive_delay_task != GNUNET_SCHEDULER_NO_TASK)
1092 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1093 if (NULL != session->client)
1094 GNUNET_SERVER_receive_done (session->client, GNUNET_SYSERR);
1096 if (NULL != session->client)
1098 GNUNET_SERVER_client_disconnect (session->client);
1099 GNUNET_SERVER_client_drop (session->client);
1100 session->client = NULL;
1102 GNUNET_free_non_null (session->addr);
1103 GNUNET_assert (NULL == session->transmit_handle);
1104 GNUNET_free (session);
1109 struct FindSessionContext
1117 session_it (void *cls,
1118 const struct GNUNET_PeerIdentity * key,
1121 struct FindSessionContext *res = cls;
1123 if (res->s == value)
1125 res->res = GNUNET_OK;
1133 find_session (struct Plugin *plugin, struct Session *session)
1135 struct FindSessionContext session_map_res;
1136 struct FindSessionContext nat_map_res;
1138 session_map_res.s = session;
1139 session_map_res.res = GNUNET_SYSERR;
1140 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap, &session_it, &session_map_res);
1142 nat_map_res.s = session;
1143 nat_map_res.res = GNUNET_SYSERR;
1144 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns, &session_it, &nat_map_res);
1146 if ((session_map_res.res == GNUNET_SYSERR) && (nat_map_res.res == GNUNET_SYSERR))
1149 return GNUNET_SYSERR;
1156 * Function that can be used by the transport service to transmit
1157 * a message using the plugin. Note that in the case of a
1158 * peer disconnecting, the continuation MUST be called
1159 * prior to the disconnect notification itself. This function
1160 * will be called with this peer's HELLO message to initiate
1161 * a fresh connection to another peer.
1163 * @param cls closure
1164 * @param session which session must be used
1165 * @param msgbuf the message to transmit
1166 * @param msgbuf_size number of bytes in 'msgbuf'
1167 * @param priority how important is the message (most plugins will
1168 * ignore message priority and just FIFO)
1169 * @param to how long to wait at most for the transmission (does not
1170 * require plugins to discard the message after the timeout,
1171 * just advisory for the desired delay; most plugins will ignore
1173 * @param cont continuation to call once the message has
1174 * been transmitted (or if the transport is ready
1175 * for the next transmission call; or if the
1176 * peer disconnected...); can be NULL
1177 * @param cont_cls closure for @a cont
1178 * @return number of bytes used (on the physical network, with overheads);
1179 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1180 * and does NOT mean that the message was not transmitted (DV)
1183 tcp_plugin_send (void *cls,
1184 struct Session *session,
1185 const char *msgbuf, size_t msgbuf_size,
1186 unsigned int priority,
1187 struct GNUNET_TIME_Relative to,
1188 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1190 struct Plugin * plugin = cls;
1191 struct PendingMessage *pm;
1193 GNUNET_assert (NULL != plugin);
1194 GNUNET_assert (NULL != session);
1196 if (GNUNET_SYSERR == find_session(plugin, session))
1198 LOG (GNUNET_ERROR_TYPE_ERROR,
1199 _("Trying to send with invalid session %p\n"));
1200 return GNUNET_SYSERR;
1203 /* create new message entry */
1204 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1205 pm->msg = (const char *) &pm[1];
1206 memcpy (&pm[1], msgbuf, msgbuf_size);
1207 pm->message_size = msgbuf_size;
1208 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1209 pm->transmit_cont = cont;
1210 pm->transmit_cont_cls = cont_cls;
1212 LOG (GNUNET_ERROR_TYPE_DEBUG,
1213 "Asked to transmit %u bytes to `%s', added message to list.\n",
1214 msgbuf_size, GNUNET_i2s (&session->target));
1216 if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
1220 GNUNET_assert (session->client != NULL);
1221 reschedule_session_timeout (session);
1222 GNUNET_SERVER_client_set_timeout (session->client,
1223 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1224 GNUNET_STATISTICS_update (plugin->env->stats,
1225 gettext_noop ("# bytes currently in TCP buffers"),
1226 msgbuf_size, GNUNET_NO);
1228 /* append pm to pending_messages list */
1229 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1230 session->pending_messages_tail, pm);
1232 process_pending_messages (session);
1235 else if (GNUNET_YES == GNUNET_CONTAINER_multipeermap_contains_value(plugin->nat_wait_conns, &session->target, session))
1237 LOG (GNUNET_ERROR_TYPE_DEBUG,
1238 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1239 GNUNET_i2s (&session->target));
1240 reschedule_session_timeout (session);
1241 GNUNET_STATISTICS_update (plugin->env->stats,
1242 gettext_noop ("# bytes currently in TCP buffers"),
1243 msgbuf_size, GNUNET_NO);
1245 /* append pm to pending_messages list */
1246 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1247 session->pending_messages_tail, pm);
1252 LOG (GNUNET_ERROR_TYPE_ERROR,
1253 "Invalid session %p\n", session);
1255 cont (cont_cls, &session->target, GNUNET_SYSERR, pm->message_size, 0);
1258 return GNUNET_SYSERR; /* session does not exist here */
1267 struct Session *result;
1272 session_lookup_it (void *cls,
1273 const struct GNUNET_PeerIdentity *key,
1276 struct SessionItCtx * si_ctx = cls;
1277 struct Session * session = value;
1279 char * a1 = strdup (tcp_address_to_string(NULL, session->addr, session->addrlen));
1280 char * a2 = strdup (tcp_address_to_string(NULL, si_ctx->addr, si_ctx->addrlen));
1281 LOG (GNUNET_ERROR_TYPE_DEBUG,
1282 "Comparing: %s %u <-> %s %u\n",
1290 if (session->addrlen != si_ctx->addrlen)
1294 if (0 != memcmp (session->addr, si_ctx->addr, si_ctx->addrlen))
1299 a1 = strdup (tcp_address_to_string(NULL, session->addr, session->addrlen));
1300 a2 = strdup (tcp_address_to_string(NULL, si_ctx->addr, si_ctx->addrlen));
1301 LOG (GNUNET_ERROR_TYPE_DEBUG,
1302 "Comparing: %s %u <-> %s %u , OK!\n",
1310 /* Found existing session */
1311 si_ctx->result = session;
1317 * Task cleaning up a NAT connection attempt after timeout
1320 nat_connect_timeout (void *cls,
1321 const struct GNUNET_SCHEDULER_TaskContext *tc)
1323 struct Session *session = cls;
1325 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1326 LOG (GNUNET_ERROR_TYPE_DEBUG,
1327 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1328 GNUNET_i2s (&session->target),
1329 tcp_address_to_string (NULL,
1330 session->addr, session->addrlen));
1331 tcp_disconnect_session (session->plugin,
1337 * Create a new session to transmit data to the target
1338 * This session will used to send data to this peer and the plugin will
1339 * notify us by calling the env->session_end function
1341 * @param cls closure
1342 * @param address pointer to the GNUNET_HELLO_Address
1343 * @return the session if the address is valid, NULL otherwise
1345 static struct Session *
1346 tcp_plugin_get_session (void *cls,
1347 const struct GNUNET_HELLO_Address *address)
1349 struct Plugin *plugin = cls;
1350 struct Session *session = NULL;
1354 struct GNUNET_CONNECTION_Handle *sa;
1355 struct sockaddr_in a4;
1356 struct sockaddr_in6 a6;
1357 const struct IPv4TcpAddress *t4;
1358 const struct IPv6TcpAddress *t6;
1359 struct GNUNET_ATS_Information ats;
1360 unsigned int is_natd = GNUNET_NO;
1363 GNUNET_assert (plugin != NULL);
1364 GNUNET_assert (address != NULL);
1365 addrlen = address->address_length;
1366 LOG (GNUNET_ERROR_TYPE_DEBUG,
1367 "Trying to get session for `%s' address of peer `%s'\n",
1368 tcp_address_to_string(NULL, address->address, address->address_length),
1369 GNUNET_i2s (&address->peer));
1371 /* look for existing session */
1373 GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
1376 struct SessionItCtx si_ctx;
1378 si_ctx.addr = (void *) address->address;
1379 si_ctx.addrlen = address->address_length;
1381 si_ctx.result = NULL;
1383 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1385 &session_lookup_it, &si_ctx);
1386 if (si_ctx.result != NULL)
1388 session = si_ctx.result;
1389 LOG (GNUNET_ERROR_TYPE_DEBUG,
1390 "Found existing session for `%s' address `%s' session %p\n",
1391 GNUNET_i2s (&address->peer),
1392 tcp_address_to_string(NULL, address->address, address->address_length),
1396 LOG (GNUNET_ERROR_TYPE_DEBUG,
1397 "Existing sessions did not match address `%s' or peer `%s'\n",
1398 tcp_address_to_string(NULL, address->address, address->address_length),
1399 GNUNET_i2s (&address->peer));
1402 if (addrlen == sizeof (struct IPv6TcpAddress))
1404 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1405 t6 = address->address;
1407 memset (&a6, 0, sizeof (a6));
1408 #if HAVE_SOCKADDR_IN_SIN_LEN
1409 a6.sin6_len = sizeof (a6);
1411 a6.sin6_family = AF_INET6;
1412 a6.sin6_port = t6->t6_port;
1413 if (t6->t6_port == 0)
1414 is_natd = GNUNET_YES;
1415 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1419 else if (addrlen == sizeof (struct IPv4TcpAddress))
1421 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1422 t4 = address->address;
1424 memset (&a4, 0, sizeof (a4));
1425 #if HAVE_SOCKADDR_IN_SIN_LEN
1426 a4.sin_len = sizeof (a4);
1428 a4.sin_family = AF_INET;
1429 a4.sin_port = t4->t4_port;
1430 if (t4->t4_port == 0)
1431 is_natd = GNUNET_YES;
1432 a4.sin_addr.s_addr = t4->ipv4_addr;
1438 GNUNET_STATISTICS_update (plugin->env->stats,
1440 ("# requests to create session with invalid address"),
1445 ats = plugin->env->get_address_type (plugin->env->cls, sb ,sbs);
1447 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1449 /* NAT client only works with IPv4 addresses */
1453 if (plugin->cur_connections >= plugin->max_connections)
1459 if ((is_natd == GNUNET_YES) &&
1461 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1464 /* Only do one NAT punch attempt per peer identity */
1468 if ((is_natd == GNUNET_YES) && (NULL != plugin->nat) &&
1470 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1473 LOG (GNUNET_ERROR_TYPE_DEBUG,
1474 "Found valid IPv4 NAT address (creating session)!\n") ;
1475 session = create_session (plugin, &address->peer, NULL, GNUNET_YES);
1476 session->addrlen = 0;
1477 session->addr = NULL;
1478 session->ats_address_network_type = ats.value;
1479 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
1480 &nat_connect_timeout,
1482 GNUNET_assert (session != NULL);
1483 GNUNET_assert (GNUNET_OK ==
1484 GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
1487 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1489 LOG (GNUNET_ERROR_TYPE_DEBUG,
1490 "Created NAT WAIT connection to `%4s' at `%s'\n",
1491 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1493 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1497 LOG (GNUNET_ERROR_TYPE_DEBUG,
1498 "Running NAT client for `%4s' at `%s' failed\n",
1499 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1500 tcp_disconnect_session (plugin, session);
1505 /* create new outbound session */
1506 GNUNET_assert (plugin->cur_connections <= plugin->max_connections);
1507 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1510 LOG (GNUNET_ERROR_TYPE_DEBUG,
1511 "Failed to create connection to `%4s' at `%s'\n",
1512 GNUNET_i2s (&address->peer), GNUNET_a2s (sb, sbs));
1515 plugin->cur_connections++;
1516 if (plugin->cur_connections == plugin->max_connections)
1517 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
1519 LOG (GNUNET_ERROR_TYPE_DEBUG,
1520 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1521 GNUNET_i2s (&address->peer), GNUNET_a2s (sb, sbs));
1523 session = create_session (plugin,
1525 GNUNET_SERVER_connect_socket (plugin->server, sa),
1527 session->addr = GNUNET_malloc (addrlen);
1528 memcpy (session->addr, address->address, addrlen);
1529 session->addrlen = addrlen;
1530 session->ats_address_network_type = ats.value;
1532 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1534 session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1535 inc_sessions (plugin, session, __LINE__);
1536 LOG (GNUNET_ERROR_TYPE_DEBUG,
1537 "Creating new session for `%s' address `%s' session %p\n",
1538 GNUNET_i2s (&address->peer),
1539 tcp_address_to_string(NULL, address->address, address->address_length),
1541 /* Send TCP Welcome */
1542 process_pending_messages (session);
1549 session_disconnect_it (void *cls,
1550 const struct GNUNET_PeerIdentity *key,
1553 struct Plugin *plugin = cls;
1554 struct Session *session = value;
1556 GNUNET_STATISTICS_update (session->plugin->env->stats,
1558 ("# transport-service disconnect requests for TCP"),
1560 tcp_disconnect_session (plugin,
1567 * Function that can be called to force a disconnect from the
1568 * specified neighbour. This should also cancel all previously
1569 * scheduled transmissions. Obviously the transmission may have been
1570 * partially completed already, which is OK. The plugin is supposed
1571 * to close the connection (if applicable) and no longer call the
1572 * transmit continuation(s).
1574 * Finally, plugin MUST NOT call the services's receive function to
1575 * notify the service that the connection to the specified target was
1576 * closed after a getting this call.
1578 * @param cls closure
1579 * @param target peer for which the last transmission is
1583 tcp_plugin_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
1585 struct Plugin *plugin = cls;
1587 LOG (GNUNET_ERROR_TYPE_DEBUG,
1588 "Disconnecting peer `%4s'\n", GNUNET_i2s (target));
1589 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap, target,
1590 &session_disconnect_it, plugin);
1591 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns, target,
1592 &session_disconnect_it, plugin);
1597 * Running pretty printers: head
1599 static struct PrettyPrinterContext *ppc_dll_head;
1602 * Running pretty printers: tail
1604 static struct PrettyPrinterContext *ppc_dll_tail;
1607 * Context for address to string conversion.
1609 struct PrettyPrinterContext
1614 struct PrettyPrinterContext *next;
1619 struct PrettyPrinterContext *prev;
1624 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
1629 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
1632 * Function to call with the result.
1634 GNUNET_TRANSPORT_AddressStringCallback asc;
1637 * Clsoure for 'asc'.
1642 * Port to add after the IP address.
1659 ppc_cancel_task (void *cls,
1660 const struct GNUNET_SCHEDULER_TaskContext *tc)
1663 struct PrettyPrinterContext *ppc = cls;
1664 struct PrettyPrinterContext *cur;
1666 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1672 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Cancel request %p, %u pending\n", ppc, count);
1673 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1674 if (NULL != ppc->resolver_handle)
1676 GNUNET_RESOLVER_request_cancel (ppc->resolver_handle);
1677 ppc->resolver_handle = NULL;
1679 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, ppc);
1685 * Append our port and forward the result.
1687 * @param cls the 'struct PrettyPrinterContext*'
1688 * @param hostname hostname part of the address
1691 append_port (void *cls, const char *hostname)
1693 struct PrettyPrinterContext *ppc = cls;
1694 struct PrettyPrinterContext *cur;
1698 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1703 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Callback request %p == %s, %u pending\n", ppc, hostname, count);
1704 if (hostname == NULL)
1706 ppc->asc (ppc->asc_cls, NULL);
1707 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, ppc);
1708 GNUNET_SCHEDULER_cancel (ppc->timeout_task);
1709 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1710 ppc->resolver_handle = NULL;
1711 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Done request %p, %u pending\n", ppc, count);
1715 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1722 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Invalid callback for PPC %p \n", ppc);
1726 if (GNUNET_YES == ppc->ipv6)
1727 GNUNET_asprintf (&ret, "%s.%u.[%s]:%d", PLUGIN_NAME, ppc->options, hostname, ppc->port);
1729 GNUNET_asprintf (&ret, "%s.%u.%s:%d", PLUGIN_NAME, ppc->options, hostname, ppc->port);
1730 ppc->asc (ppc->asc_cls, ret);
1736 * Convert the transports address to a nice, human-readable
1739 * @param cls closure
1740 * @param type name of the transport that generated the address
1741 * @param addr one of the addresses of the host, NULL for the last address
1742 * the specific address format depends on the transport
1743 * @param addrlen length of the address
1744 * @param numeric should (IP) addresses be displayed in numeric form?
1745 * @param timeout after how long should we give up?
1746 * @param asc function to call on each string
1747 * @param asc_cls closure for asc
1750 tcp_plugin_address_pretty_printer (void *cls, const char *type,
1751 const void *addr, size_t addrlen,
1753 struct GNUNET_TIME_Relative timeout,
1754 GNUNET_TRANSPORT_AddressStringCallback asc,
1757 struct PrettyPrinterContext *ppc;
1760 struct sockaddr_in a4;
1761 struct sockaddr_in6 a6;
1762 const struct IPv4TcpAddress *t4;
1763 const struct IPv6TcpAddress *t6;
1767 if (addrlen == sizeof (struct IPv6TcpAddress))
1770 memset (&a6, 0, sizeof (a6));
1771 a6.sin6_family = AF_INET6;
1772 a6.sin6_port = t6->t6_port;
1773 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1774 port = ntohs (t6->t6_port);
1775 options = ntohl (t6->options);
1779 else if (addrlen == sizeof (struct IPv4TcpAddress))
1782 memset (&a4, 0, sizeof (a4));
1783 a4.sin_family = AF_INET;
1784 a4.sin_port = t4->t4_port;
1785 a4.sin_addr.s_addr = t4->ipv4_addr;
1786 port = ntohs (t4->t4_port);
1787 options = ntohl (t4->options);
1791 else if (0 == addrlen)
1793 asc (asc_cls, TRANSPORT_SESSION_INBOUND_STRING);
1794 asc (asc_cls, NULL);
1799 /* invalid address */
1800 GNUNET_break_op (0);
1801 asc (asc_cls, NULL);
1804 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1805 if (addrlen == sizeof (struct IPv6TcpAddress))
1806 ppc->ipv6 = GNUNET_YES;
1808 ppc->ipv6 = GNUNET_NO;
1810 ppc->asc_cls = asc_cls;
1812 ppc->options = options;
1813 ppc->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(timeout, 2),
1814 &ppc_cancel_task, ppc);
1815 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric,
1818 if (NULL != ppc->resolver_handle)
1820 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Adding request %p\n", ppc);
1821 GNUNET_CONTAINER_DLL_insert (ppc_dll_head, ppc_dll_tail, ppc);
1832 * Check if the given port is plausible (must be either our listen
1833 * port or our advertised port), or any port if we are behind NAT
1834 * and do not have a port open. If it is neither, we return
1837 * @param plugin global variables
1838 * @param in_port port number to check
1839 * @return GNUNET_OK if port is either open_port or adv_port
1842 check_port (struct Plugin *plugin, uint16_t in_port)
1844 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1846 return GNUNET_SYSERR;
1851 * Function that will be called to check if a binary address for this
1852 * plugin is well-formed and corresponds to an address for THIS peer
1853 * (as per our configuration). Naturally, if absolutely necessary,
1854 * plugins can be a bit conservative in their answer, but in general
1855 * plugins should make sure that the address does not redirect
1856 * traffic to a 3rd party that might try to man-in-the-middle our
1859 * @param cls closure, our 'struct Plugin*'
1860 * @param addr pointer to the address
1861 * @param addrlen length of addr
1862 * @return GNUNET_OK if this is a plausible address for this peer
1863 * and transport, GNUNET_SYSERR if not
1866 tcp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1868 struct Plugin *plugin = cls;
1869 struct IPv4TcpAddress *v4;
1870 struct IPv6TcpAddress *v6;
1872 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1873 (addrlen != sizeof (struct IPv6TcpAddress)))
1877 return GNUNET_SYSERR;
1880 if (addrlen == sizeof (struct IPv4TcpAddress))
1882 v4 = (struct IPv4TcpAddress *) addr;
1883 if (0 != memcmp (&v4->options, &myoptions, sizeof (myoptions)))
1886 return GNUNET_SYSERR;
1888 if (GNUNET_OK != check_port (plugin, ntohs (v4->t4_port)))
1889 return GNUNET_SYSERR;
1891 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1892 sizeof (struct in_addr)))
1893 return GNUNET_SYSERR;
1897 v6 = (struct IPv6TcpAddress *) addr;
1898 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1900 GNUNET_break_op (0);
1901 return GNUNET_SYSERR;
1903 if (0 != memcmp (&v6->options, &myoptions, sizeof (myoptions)))
1906 return GNUNET_SYSERR;
1908 if (GNUNET_OK != check_port (plugin, ntohs (v6->t6_port)))
1909 return GNUNET_SYSERR;
1911 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1912 sizeof (struct in6_addr)))
1913 return GNUNET_SYSERR;
1920 * We've received a nat probe from this peer via TCP. Finish
1921 * creating the client session and resume sending of queued
1924 * @param cls closure
1925 * @param client identification of the client
1926 * @param message the actual message
1929 handle_tcp_nat_probe (void *cls, struct GNUNET_SERVER_Client *client,
1930 const struct GNUNET_MessageHeader *message)
1932 struct Plugin *plugin = cls;
1933 struct Session *session;
1934 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1937 struct IPv4TcpAddress *t4;
1938 struct IPv6TcpAddress *t6;
1939 const struct sockaddr_in *s4;
1940 const struct sockaddr_in6 *s6;
1942 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NAT probe\n");
1944 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1945 * a connection to this peer by running gnunet-nat-client. This peer
1946 * received the punch message and now wants us to use the new connection
1947 * as the default for that peer. Do so and then send a WELCOME message
1948 * so we can really be connected!
1950 if (ntohs (message->size) != sizeof (struct TCP_NAT_ProbeMessage))
1952 GNUNET_break_op (0);
1953 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1957 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
1959 memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
1960 sizeof (struct GNUNET_PeerIdentity)))
1962 /* refuse connections from ourselves */
1963 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1968 GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
1971 if (session == NULL)
1973 LOG (GNUNET_ERROR_TYPE_DEBUG,
1974 "Did NOT find session for NAT probe!\n");
1975 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1978 LOG (GNUNET_ERROR_TYPE_DEBUG,
1979 "Found session for NAT probe!\n");
1981 if (session->nat_connection_timeout != GNUNET_SCHEDULER_NO_TASK)
1983 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
1984 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1987 if (GNUNET_OK != GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1990 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1991 tcp_disconnect_session (plugin, session);
1994 GNUNET_assert (GNUNET_CONTAINER_multipeermap_remove
1995 (plugin->nat_wait_conns,
1996 &tcp_nat_probe->clientIdentity,
1997 session) == GNUNET_YES);
1998 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1999 &session->target, session,
2000 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2001 session->last_activity = GNUNET_TIME_absolute_get ();
2002 session->inbound = GNUNET_NO;
2003 LOG (GNUNET_ERROR_TYPE_DEBUG,
2004 "Found address `%s' for incoming connection\n",
2005 GNUNET_a2s (vaddr, alen));
2006 switch (((const struct sockaddr *) vaddr)->sa_family)
2010 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
2012 t4->t4_port = s4->sin_port;
2013 t4->ipv4_addr = s4->sin_addr.s_addr;
2015 session->addrlen = sizeof (struct IPv4TcpAddress);
2019 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
2021 t6->t6_port = s6->sin6_port;
2022 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
2024 session->addrlen = sizeof (struct IPv6TcpAddress);
2027 GNUNET_break_op (0);
2028 LOG (GNUNET_ERROR_TYPE_DEBUG,
2029 "Bad address for incoming connection!\n");
2030 GNUNET_free (vaddr);
2031 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2032 tcp_disconnect_session (plugin, session);
2035 GNUNET_free (vaddr);
2036 GNUNET_break (NULL == session->client);
2037 GNUNET_SERVER_client_keep (client);
2038 session->client = client;
2039 inc_sessions (plugin, session, __LINE__);
2040 GNUNET_STATISTICS_update (plugin->env->stats,
2041 gettext_noop ("# TCP sessions active"), 1,
2043 process_pending_messages (session);
2044 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2049 * We've received a welcome from this peer via TCP. Possibly create a
2050 * fresh client record and send back our welcome.
2052 * @param cls closure
2053 * @param client identification of the client
2054 * @param message the actual message
2057 handle_tcp_welcome (void *cls, struct GNUNET_SERVER_Client *client,
2058 const struct GNUNET_MessageHeader *message)
2060 struct Plugin *plugin = cls;
2061 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2062 struct Session *session;
2065 struct IPv4TcpAddress *t4;
2066 struct IPv6TcpAddress *t6;
2067 const struct sockaddr_in *s4;
2068 const struct sockaddr_in6 *s6;
2069 struct GNUNET_ATS_Information ats;
2072 memcmp (&wm->clientIdentity, plugin->env->my_identity,
2073 sizeof (struct GNUNET_PeerIdentity)))
2075 /* refuse connections from ourselves */
2076 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2077 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2079 LOG (GNUNET_ERROR_TYPE_WARNING,
2080 "Received %s message from my own identity `%4s' on address `%s'\n",
2081 "WELCOME", GNUNET_i2s (&wm->clientIdentity), GNUNET_a2s (vaddr, alen));
2082 GNUNET_free (vaddr);
2084 GNUNET_break_op (0);
2087 LOG (GNUNET_ERROR_TYPE_DEBUG,
2088 "Received %s message from `%4s' %p\n", "WELCOME",
2089 GNUNET_i2s (&wm->clientIdentity), client);
2090 GNUNET_STATISTICS_update (plugin->env->stats,
2091 gettext_noop ("# TCP WELCOME messages received"), 1,
2093 session = lookup_session_by_client (plugin, client);
2094 if (session != NULL)
2096 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2098 LOG (GNUNET_ERROR_TYPE_DEBUG,
2099 "Found existing session %p for peer `%s'\n",
2101 GNUNET_a2s (vaddr, alen));
2102 GNUNET_free (vaddr);
2107 GNUNET_SERVER_client_keep (client);
2108 if (plugin->service != NULL) /* Otherwise value is incremented in tcp_access_check */
2109 plugin->cur_connections++;
2110 if (plugin->cur_connections == plugin->max_connections)
2111 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2113 session = create_session (plugin, &wm->clientIdentity, client, GNUNET_NO);
2114 session->inbound = GNUNET_YES;
2115 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2117 if (alen == sizeof (struct sockaddr_in))
2120 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
2121 t4->options = htonl (0);
2122 t4->t4_port = s4->sin_port;
2123 t4->ipv4_addr = s4->sin_addr.s_addr;
2125 session->addrlen = sizeof (struct IPv4TcpAddress);
2127 else if (alen == sizeof (struct sockaddr_in6))
2130 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
2131 t6->options = htonl (0);
2132 t6->t6_port = s6->sin6_port;
2133 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
2135 session->addrlen = sizeof (struct IPv6TcpAddress);
2138 ats = plugin->env->get_address_type (plugin->env->cls, vaddr ,alen);
2139 session->ats_address_network_type = ats.value;
2140 LOG (GNUNET_ERROR_TYPE_DEBUG,
2141 "Creating new session %p for peer `%s'\n",
2143 GNUNET_a2s (vaddr, alen));
2144 GNUNET_free (vaddr);
2145 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2148 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2149 inc_sessions (plugin, session, __LINE__);
2153 LOG (GNUNET_ERROR_TYPE_DEBUG,
2154 "Did not obtain TCP socket address for incoming connection\n");
2159 if (session->expecting_welcome != GNUNET_YES)
2161 GNUNET_break_op (0);
2162 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2166 session->last_activity = GNUNET_TIME_absolute_get ();
2167 session->expecting_welcome = GNUNET_NO;
2169 /* Notify transport and ATS about new session */
2170 if (GNUNET_YES == session->inbound)
2172 plugin->env->session_start (NULL, &wm->clientIdentity, PLUGIN_NAME,
2173 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2174 (GNUNET_YES == session->inbound) ? 0 : session->addrlen,
2178 process_pending_messages (session);
2180 GNUNET_SERVER_client_set_timeout (client,
2181 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2182 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2187 * Task to signal the server that we can continue
2188 * receiving from the TCP client now.
2190 * @param cls the 'struct Session*'
2191 * @param tc task context (unused)
2194 delayed_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2196 struct Session *session = cls;
2198 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
2199 reschedule_session_timeout (session);
2201 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
2206 * We've received data for this peer via TCP. Unbox,
2207 * compute latency and forward.
2209 * @param cls closure
2210 * @param client identification of the client
2211 * @param message the actual message
2214 handle_tcp_data (void *cls, struct GNUNET_SERVER_Client *client,
2215 const struct GNUNET_MessageHeader *message)
2217 struct Plugin *plugin = cls;
2218 struct Session *session;
2219 struct GNUNET_TIME_Relative delay;
2222 type = ntohs (message->type);
2223 if ((GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2224 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type))
2226 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2227 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2230 session = lookup_session_by_client (plugin, client);
2231 if (NULL == session)
2233 /* No inbound session found */
2237 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2238 LOG (GNUNET_ERROR_TYPE_ERROR,
2239 "Received unexpected %u bytes of type %u from `%s'\n",
2240 (unsigned int) ntohs (message->size),
2241 (unsigned int) ntohs (message->type),
2242 GNUNET_a2s(vaddr, alen));
2243 GNUNET_break_op (0);
2244 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2245 GNUNET_free_non_null(vaddr);
2248 else if (GNUNET_YES == session->expecting_welcome)
2250 /* Session is expecting WELCOME message */
2254 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2255 LOG (GNUNET_ERROR_TYPE_ERROR,
2256 "Received unexpected %u bytes of type %u from `%s'\n",
2257 (unsigned int) ntohs (message->size),
2258 (unsigned int) ntohs (message->type),
2259 GNUNET_a2s(vaddr, alen));
2260 GNUNET_break_op (0);
2261 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2262 GNUNET_free_non_null(vaddr);
2266 session->last_activity = GNUNET_TIME_absolute_get ();
2267 LOG (GNUNET_ERROR_TYPE_DEBUG,
2268 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2269 (unsigned int) ntohs (message->size),
2270 (unsigned int) ntohs (message->type),
2271 GNUNET_i2s (&session->target));
2273 GNUNET_STATISTICS_update (plugin->env->stats,
2274 gettext_noop ("# bytes received via TCP"),
2275 ntohs (message->size), GNUNET_NO);
2276 struct GNUNET_ATS_Information distance;
2278 distance.type = htonl (GNUNET_ATS_NETWORK_TYPE);
2279 distance.value = session->ats_address_network_type;
2280 GNUNET_break (ntohl(session->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
2282 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2286 delay = plugin->env->receive (plugin->env->cls,
2290 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2291 (GNUNET_YES == session->inbound) ? 0 : session->addrlen);
2292 plugin->env->update_address_metrics (plugin->env->cls,
2294 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2295 (GNUNET_YES == session->inbound) ? 0 : session->addrlen,
2296 session, &distance, 1);
2298 reschedule_session_timeout (session);
2300 if (0 == delay.rel_value_us)
2302 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2306 LOG (GNUNET_ERROR_TYPE_DEBUG,
2307 "Throttling receiving from `%s' for %s\n",
2308 GNUNET_i2s (&session->target),
2309 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
2310 GNUNET_SERVER_disable_receive_done_warning (client);
2311 session->receive_delay_task =
2312 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2318 * Functions with this signature are called whenever a peer
2319 * is disconnected on the network level.
2321 * @param cls closure
2322 * @param client identification of the client
2325 disconnect_notify (void *cls, struct GNUNET_SERVER_Client *client)
2327 struct Plugin *plugin = cls;
2328 struct Session *session;
2332 session = lookup_session_by_client (plugin, client);
2333 if (session == NULL)
2334 return; /* unknown, nothing to do */
2335 LOG (GNUNET_ERROR_TYPE_DEBUG,
2336 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2337 GNUNET_i2s (&session->target),
2339 NULL) ? tcp_address_to_string (session->plugin,
2344 if (plugin->cur_connections == plugin->max_connections)
2345 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2347 if (plugin->cur_connections < 1)
2350 plugin->cur_connections--;
2352 GNUNET_STATISTICS_update (session->plugin->env->stats,
2354 ("# network-level TCP disconnect events"), 1,
2356 tcp_disconnect_session (plugin, session);
2361 * We can now send a probe message, copy into buffer to really send.
2363 * @param cls closure, a struct TCPProbeContext
2364 * @param size max size to copy
2365 * @param buf buffer to copy message to
2366 * @return number of bytes copied into buf
2369 notify_send_probe (void *cls, size_t size, void *buf)
2371 struct TCPProbeContext *tcp_probe_ctx = cls;
2372 struct Plugin *plugin = tcp_probe_ctx->plugin;
2375 tcp_probe_ctx->transmit_handle = NULL;
2376 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2380 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2381 GNUNET_free (tcp_probe_ctx);
2384 GNUNET_assert (size >= sizeof (tcp_probe_ctx->message));
2385 memcpy (buf, &tcp_probe_ctx->message, sizeof (tcp_probe_ctx->message));
2386 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2387 tcp_probe_ctx->sock);
2388 ret = sizeof (tcp_probe_ctx->message);
2389 GNUNET_free (tcp_probe_ctx);
2395 * Function called by the NAT subsystem suggesting another peer wants
2396 * to connect to us via connection reversal. Try to connect back to the
2399 * @param cls closure
2400 * @param addr address to try
2401 * @param addrlen number of bytes in @a addr
2404 try_connection_reversal (void *cls, const struct sockaddr *addr,
2407 struct Plugin *plugin = cls;
2408 struct GNUNET_CONNECTION_Handle *sock;
2409 struct TCPProbeContext *tcp_probe_ctx;
2412 * We have received an ICMP response, ostensibly from a peer
2413 * that wants to connect to us! Send a message to establish a connection.
2415 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, addr, addrlen);
2418 /* failed for some odd reason (out of sockets?); ignore attempt */
2422 /* FIXME: do we need to track these probe context objects so that
2423 * we can clean them up on plugin unload? */
2424 tcp_probe_ctx = GNUNET_malloc (sizeof (struct TCPProbeContext));
2425 tcp_probe_ctx->message.header.size =
2426 htons (sizeof (struct TCP_NAT_ProbeMessage));
2427 tcp_probe_ctx->message.header.type =
2428 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2429 memcpy (&tcp_probe_ctx->message.clientIdentity, plugin->env->my_identity,
2430 sizeof (struct GNUNET_PeerIdentity));
2431 tcp_probe_ctx->plugin = plugin;
2432 tcp_probe_ctx->sock = sock;
2433 GNUNET_CONTAINER_DLL_insert (plugin->probe_head, plugin->probe_tail,
2435 tcp_probe_ctx->transmit_handle =
2436 GNUNET_CONNECTION_notify_transmit_ready (sock,
2437 ntohs (tcp_probe_ctx->
2438 message.header.size),
2439 GNUNET_TIME_UNIT_FOREVER_REL,
2447 * Session was idle, so disconnect it
2450 session_timeout (void *cls,
2451 const struct GNUNET_SCHEDULER_TaskContext *tc)
2453 struct Session *s = cls;
2455 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2457 "Session %p was idle for %s, disconnecting\n",
2459 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2461 /* call session destroy function */
2462 tcp_disconnect_session(s->plugin, s);
2467 * Start session timeout
2470 start_session_timeout (struct Session *s)
2472 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
2473 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2477 "Timeout for session %p set to %s\n",
2479 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2485 * Increment session timeout due to activity
2488 reschedule_session_timeout (struct Session *s)
2490 GNUNET_assert (NULL != s);
2491 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
2493 GNUNET_SCHEDULER_cancel (s->timeout_task);
2494 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2498 "Timeout rescheduled for session %p set to %s\n",
2500 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2508 * @param s session to cancel timeout for
2511 stop_session_timeout (struct Session *s)
2513 GNUNET_assert (NULL != s);
2515 if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
2517 GNUNET_SCHEDULER_cancel (s->timeout_task);
2518 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2519 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2520 "Timeout stopped for session %p canceled\n",
2526 * Function obtain the network type for a session
2528 * @param cls closure ('struct Plugin*')
2529 * @param session the session
2530 * @return the network type in HBO or GNUNET_SYSERR
2532 static enum GNUNET_ATS_Network_Type
2533 tcp_get_network (void *cls,
2534 struct Session *session)
2536 GNUNET_assert (NULL != session);
2537 return ntohl (session->ats_address_network_type);
2542 * Entry point for the plugin.
2544 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2545 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2548 libgnunet_plugin_transport_tcp_init (void *cls)
2550 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2551 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2552 sizeof (struct WelcomeMessage)},
2553 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2554 sizeof (struct TCP_NAT_ProbeMessage)},
2555 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2558 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2559 struct GNUNET_TRANSPORT_PluginFunctions *api;
2560 struct Plugin *plugin;
2561 struct GNUNET_SERVICE_Context *service;
2562 unsigned long long aport;
2563 unsigned long long bport;
2564 unsigned long long max_connections;
2566 struct GNUNET_TIME_Relative idle_timeout;
2569 struct sockaddr **addrs;
2570 socklen_t *addrlens;
2573 if (NULL == env->receive)
2575 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2576 initialze the plugin or the API */
2577 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2579 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2580 api->address_to_string = &tcp_address_to_string;
2581 api->string_to_address = &tcp_string_to_address;
2585 GNUNET_assert (NULL != env->cfg);
2587 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2590 max_connections = 128;
2594 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp", "PORT",
2595 &bport)) || (bport > 65535) ||
2597 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2598 "ADVERTISED-PORT", &aport)) &&
2601 LOG (GNUNET_ERROR_TYPE_ERROR,
2602 _("Require valid port number for service `%s' in configuration!\n"),
2612 service = GNUNET_SERVICE_start ("transport-tcp", env->cfg, GNUNET_SERVICE_OPTION_NONE);
2613 if (service == NULL)
2615 LOG (GNUNET_ERROR_TYPE_WARNING,
2616 _("Failed to start service.\n"));
2623 /* Initialize my flags */
2626 plugin = GNUNET_new (struct Plugin);
2627 plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections, GNUNET_YES);
2628 plugin->max_connections = max_connections;
2629 plugin->cur_connections = 0;
2630 plugin->open_port = bport;
2631 plugin->adv_port = aport;
2633 plugin->lsock = NULL;
2634 if ((service != NULL) &&
2637 GNUNET_SERVICE_get_server_addresses ("transport-tcp", env->cfg, &addrs,
2640 for (ret = ret_s-1; ret >= 0; ret--)
2641 LOG (GNUNET_ERROR_TYPE_INFO,
2642 "Binding to address `%s'\n",
2643 GNUNET_a2s (addrs[ret], addrlens[ret]));
2645 GNUNET_NAT_register (env->cfg, GNUNET_YES, aport, (unsigned int) ret_s,
2646 (const struct sockaddr **) addrs, addrlens,
2647 &tcp_nat_port_map_callback,
2648 &try_connection_reversal, plugin);
2649 for (ret = ret_s -1; ret >= 0; ret--)
2651 GNUNET_assert (addrs[ret] != NULL);
2652 GNUNET_free (addrs[ret]);
2654 GNUNET_free_non_null (addrs);
2655 GNUNET_free_non_null (addrlens);
2659 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2660 GNUNET_YES, 0, 0, NULL, NULL, NULL,
2661 &try_connection_reversal, plugin);
2663 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2665 api->send = &tcp_plugin_send;
2666 api->get_session = &tcp_plugin_get_session;
2668 api->disconnect_session = &tcp_disconnect_session;
2669 api->disconnect_peer = &tcp_plugin_disconnect;
2670 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2671 api->check_address = &tcp_plugin_check_address;
2672 api->address_to_string = &tcp_address_to_string;
2673 api->string_to_address = &tcp_string_to_address;
2674 api->get_network = &tcp_get_network;
2675 plugin->service = service;
2676 if (NULL != service)
2678 plugin->server = GNUNET_SERVICE_get_server (service);
2683 GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-tcp",
2684 "TIMEOUT", &idle_timeout))
2686 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2687 "transport-tcp", "TIMEOUT");
2688 if (plugin->nat != NULL)
2689 GNUNET_NAT_unregister (plugin->nat);
2690 GNUNET_free (plugin);
2695 GNUNET_SERVER_create_with_sockets (&plugin_tcp_access_check, plugin,
2696 NULL, idle_timeout, GNUNET_YES);
2698 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2699 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2701 i < sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2703 plugin->handlers[i].callback_cls = plugin;
2705 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2706 GNUNET_SERVER_disconnect_notify (plugin->server, &disconnect_notify, plugin);
2707 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16, GNUNET_YES);
2709 LOG (GNUNET_ERROR_TYPE_INFO,
2710 _("TCP transport listening on port %llu\n"), bport);
2712 LOG (GNUNET_ERROR_TYPE_INFO,
2713 _("TCP transport not listening on any port (client only)\n"));
2715 LOG (GNUNET_ERROR_TYPE_INFO,
2716 _("TCP transport advertises itself as being on port %llu\n"),
2718 /* Initially set connections to 0 */
2719 GNUNET_assert (NULL != plugin->env->stats);
2720 GNUNET_STATISTICS_set (plugin->env->stats,
2721 gettext_noop ("# TCP sessions active"), 0,
2728 * Exit point from the plugin.
2731 libgnunet_plugin_transport_tcp_done (void *cls)
2733 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2734 struct Plugin *plugin = api->cls;
2735 struct TCPProbeContext *tcp_probe;
2736 struct PrettyPrinterContext *cur;
2737 struct PrettyPrinterContext *next;
2744 LOG (GNUNET_ERROR_TYPE_DEBUG,
2745 "Shutting down TCP plugin\n");
2747 /* Removing leftover sessions */
2748 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2749 &session_disconnect_it, plugin);
2750 /* Removing leftover NAT sessions */
2751 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
2752 &session_disconnect_it, plugin);
2754 next = ppc_dll_head;
2755 for (cur = next; NULL != cur; cur = next)
2758 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, cur);
2759 if (NULL != cur->resolver_handle)
2760 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
2761 GNUNET_SCHEDULER_cancel (cur->timeout_task);
2766 if (plugin->service != NULL)
2767 GNUNET_SERVICE_stop (plugin->service);
2769 GNUNET_SERVER_destroy (plugin->server);
2770 GNUNET_free (plugin->handlers);
2771 if (plugin->nat != NULL)
2772 GNUNET_NAT_unregister (plugin->nat);
2773 while (NULL != (tcp_probe = plugin->probe_head))
2775 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2777 GNUNET_CONNECTION_destroy (tcp_probe->sock);
2778 GNUNET_free (tcp_probe);
2780 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
2781 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
2782 GNUNET_free (plugin);
2787 /* end of plugin_transport_tcp.c */