2 This file is part of GNUnet
3 (C) 2002--2013 Christian Grothoff (and other contributing authors)
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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
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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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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_util_lib.h"
29 #include "gnunet_nat_lib.h"
30 #include "gnunet_protocols.h"
31 #include "gnunet_resolver_service.h"
32 #include "gnunet_signatures.h"
33 #include "gnunet_statistics_service.h"
34 #include "gnunet_transport_service.h"
35 #include "gnunet_transport_plugin.h"
36 #include "transport.h"
38 #define LOG(kind,...) GNUNET_log_from (kind, "transport-tcp",__VA_ARGS__)
40 #define PLUGIN_NAME "tcp"
42 #define EXTRA_CHECKS ALLOW_EXTRA_CHECKS
45 * How long until we give up on establishing an NAT connection?
48 #define NAT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
51 GNUNET_NETWORK_STRUCT_BEGIN
56 static uint32_t myoptions;
59 * Initial handshake message for a session.
64 * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
66 struct GNUNET_MessageHeader header;
69 * Identity of the node connecting (TCP client)
71 struct GNUNET_PeerIdentity clientIdentity;
77 * Basically a WELCOME message, but with the purpose
78 * of giving the waiting peer a client handle to use
80 struct TCP_NAT_ProbeMessage
83 * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
85 struct GNUNET_MessageHeader header;
88 * Identity of the sender of the message.
90 struct GNUNET_PeerIdentity clientIdentity;
93 GNUNET_NETWORK_STRUCT_END
96 * Context for sending a NAT probe via TCP.
98 struct TCPProbeContext
102 * Active probes are kept in a DLL.
104 struct TCPProbeContext *next;
107 * Active probes are kept in a DLL.
109 struct TCPProbeContext *prev;
114 struct GNUNET_CONNECTION_Handle *sock;
117 * Message to be sent.
119 struct TCP_NAT_ProbeMessage message;
122 * Handle to the transmission.
124 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
127 * Transport plugin handle.
129 struct Plugin *plugin;
133 GNUNET_NETWORK_STRUCT_BEGIN
136 * Network format for IPv4 addresses.
138 struct IPv4TcpAddress
141 * Optional options and flags for this address
146 * IPv4 address, in network byte order.
148 uint32_t ipv4_addr GNUNET_PACKED;
151 * Port number, in network byte order.
153 uint16_t t4_port GNUNET_PACKED;
159 * Network format for IPv6 addresses.
161 struct IPv6TcpAddress
164 * Optional flags for this address
171 struct in6_addr ipv6_addr GNUNET_PACKED;
174 * Port number, in network byte order.
176 uint16_t t6_port GNUNET_PACKED;
179 GNUNET_NETWORK_STRUCT_END
182 * Encapsulation of all of the state of the plugin.
188 * Information kept for each message that is yet to
191 struct PendingMessage
195 * This is a doubly-linked list.
197 struct PendingMessage *next;
200 * This is a doubly-linked list.
202 struct PendingMessage *prev;
205 * The pending message
210 * Continuation function to call once the message
211 * has been sent. Can be NULL if there is no
212 * continuation to call.
214 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
217 * Closure for transmit_cont.
219 void *transmit_cont_cls;
222 * Timeout value for the pending message.
224 struct GNUNET_TIME_Absolute timeout;
227 * So that the gnunet-service-transport can group messages together,
228 * these pending messages need to accept a message buffer and size
229 * instead of just a GNUNET_MessageHeader.
237 * Session handle for TCP connections.
242 * To whom are we talking to (set to our identity
243 * if we are still waiting for the welcome message)
245 struct GNUNET_PeerIdentity target;
250 struct SessionHeader header;
253 * Pointer to the global plugin struct.
255 struct Plugin *plugin;
258 * The client (used to identify this connection)
260 struct GNUNET_SERVER_Client *client;
263 * Task cleaning up a NAT client connection establishment attempt;
265 GNUNET_SCHEDULER_TaskIdentifier nat_connection_timeout;
268 * Messages currently pending for transmission
269 * to this peer, if any.
271 struct PendingMessage *pending_messages_head;
274 * Messages currently pending for transmission
275 * to this peer, if any.
277 struct PendingMessage *pending_messages_tail;
280 * Handle for pending transmission request.
282 struct GNUNET_SERVER_TransmitHandle *transmit_handle;
285 * ID of task used to delay receiving more to throttle sender.
287 GNUNET_SCHEDULER_TaskIdentifier receive_delay_task;
290 * Session timeout task
292 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
295 * Address of the other peer (either based on our 'connect'
296 * call or on our 'accept' call).
298 * struct IPv4TcpAddress or struct IPv6TcpAddress
308 * Last activity on this connection. Used to select preferred
311 struct GNUNET_TIME_Absolute last_activity;
314 * Are we still expecting the welcome message? (#GNUNET_YES/#GNUNET_NO)
316 int expecting_welcome;
319 * Was this a connection that was inbound (we accepted)? (#GNUNET_YES/#GNUNET_NO)
324 * Was this session created using NAT traversal?
329 * ATS network type in NBO
331 enum GNUNET_ATS_Network_Type ats_address_network_type;
336 * Encapsulation of all of the state of the plugin.
343 struct GNUNET_TRANSPORT_PluginEnvironment *env;
348 struct GNUNET_CONNECTION_Handle *lsock;
351 * Our handle to the NAT module.
353 struct GNUNET_NAT_Handle *nat;
356 * Map from peer identities to sessions for the given peer.
358 struct GNUNET_CONTAINER_MultiPeerMap *sessionmap;
361 * Handle to the network service.
363 struct GNUNET_SERVICE_Context *service;
366 * Handle to the server for this service.
368 struct GNUNET_SERVER_Handle *server;
371 * Copy of the handler array where the closures are
372 * set to this struct's instance.
374 struct GNUNET_SERVER_MessageHandler *handlers;
377 * Map of peers we have tried to contact behind a NAT
379 struct GNUNET_CONTAINER_MultiPeerMap *nat_wait_conns;
382 * List of active TCP probes.
384 struct TCPProbeContext *probe_head;
387 * List of active TCP probes.
389 struct TCPProbeContext *probe_tail;
392 * Handle for (DYN)DNS lookup of our external IP.
394 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
397 * How many more TCP sessions are we allowed to open right now?
399 unsigned long long max_connections;
402 * How many more TCP sessions do we have right now?
404 unsigned long long cur_connections;
407 * ID of task used to update our addresses when one expires.
409 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
412 * Port that we are actually listening on.
417 * Port that the user said we would have visible to the
426 * Function called for a quick conversion of the binary address to
427 * a numeric address. Note that the caller must not free the
428 * address and that the next call to this function is allowed
429 * to override the address again.
431 * @param cls closure ('struct Plugin*')
432 * @param addr binary address
433 * @param addrlen length of the address
434 * @return string representing the same address
437 tcp_address_to_string (void *cls,
443 * Function to check if an inbound connection is acceptable.
444 * Mostly used to limit the total number of open connections
447 * @param cls the `struct Plugin`
448 * @param ucred credentials, if available, otherwise NULL
449 * @param addr address
450 * @param addrlen length of address
451 * @return #GNUNET_YES to allow, #GNUNET_NO to deny, #GNUNET_SYSERR
452 * for unknown address family (will be denied).
455 plugin_tcp_access_check (void *cls,
456 const struct GNUNET_CONNECTION_Credentials *ucred,
457 const struct sockaddr *addr, socklen_t addrlen)
459 struct Plugin *plugin = cls;
460 LOG (GNUNET_ERROR_TYPE_DEBUG,
461 "Accepting new incoming TCP connection from `%s'\n",
462 GNUNET_a2s (addr, addrlen));
463 if (plugin->cur_connections >= plugin->max_connections)
465 plugin->cur_connections ++;
471 * Our external IP address/port mapping has changed.
473 * @param cls closure, the 'struct Plugin'
474 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
475 * the previous (now invalid) one
476 * @param addr either the previous or the new public IP address
477 * @param addrlen actual lenght of the address
480 tcp_nat_port_map_callback (void *cls, int add_remove,
481 const struct sockaddr *addr,
484 struct Plugin *plugin = cls;
485 struct IPv4TcpAddress t4;
486 struct IPv6TcpAddress t6;
490 LOG (GNUNET_ERROR_TYPE_INFO,
491 "NAT notification to %s address `%s'\n",
492 (GNUNET_YES == add_remove) ? "add" : "remove",
493 GNUNET_a2s (addr, addrlen));
494 /* convert 'addr' to our internal format */
495 switch (addr->sa_family)
498 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
499 memset (&t4,0, sizeof (t4));
500 t4.options = htonl (myoptions);
501 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
502 t4.t4_port = ((struct sockaddr_in *) addr)->sin_port;
507 GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
508 memset (&t6, 0, sizeof (t6));
509 memcpy (&t6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
510 sizeof (struct in6_addr));
511 t6.options = htonl (myoptions);
512 t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
520 /* modify our published address list */
521 plugin->env->notify_address (plugin->env->cls, add_remove, arg, args, "tcp");
526 * Function called for a quick conversion of the binary address to
527 * a numeric address. Note that the caller must not free the
528 * address and that the next call to this function is allowed
529 * to override the address again.
531 * @param cls closure (`struct Plugin*`)
532 * @param addr binary address
533 * @param addrlen length of the address
534 * @return string representing the same address
537 tcp_address_to_string (void *cls, const void *addr, size_t addrlen)
539 static char rbuf[INET6_ADDRSTRLEN + 12];
540 char buf[INET6_ADDRSTRLEN];
544 const struct IPv4TcpAddress *t4;
545 const struct IPv6TcpAddress *t6;
552 case sizeof (struct IPv6TcpAddress):
555 port = ntohs (t6->t6_port);
556 options = ntohl (t6->options);
557 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
560 case sizeof (struct IPv4TcpAddress):
563 port = ntohs (t4->t4_port);
564 options = ntohl (t4->options);
565 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
570 GNUNET_snprintf (rbuf, sizeof (rbuf), "%s",
571 TRANSPORT_SESSION_INBOUND_STRING);
575 LOG (GNUNET_ERROR_TYPE_WARNING,
576 _("Unexpected address length: %u bytes\n"),
577 (unsigned int) addrlen);
580 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
582 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
585 GNUNET_snprintf (rbuf,
599 * Function called to convert a string address to
602 * @param cls closure (`struct Plugin*`)
603 * @param addr string address
604 * @param addrlen length of the address
605 * @param buf location to store the buffer
606 * @param added location to store the number of bytes in the buffer.
607 * If the function returns #GNUNET_SYSERR, its contents are undefined.
608 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
611 tcp_string_to_address (void *cls,
614 void **buf, size_t *added)
616 struct sockaddr_storage socket_address;
622 /* Format tcp.options.address:port */
626 if ((NULL == addr) || (addrlen == 0))
629 return GNUNET_SYSERR;
631 if ('\0' != addr[addrlen - 1])
634 return GNUNET_SYSERR;
636 if (strlen (addr) != addrlen - 1)
639 return GNUNET_SYSERR;
641 plugin = GNUNET_strdup (addr);
642 optionstr = strchr (plugin, '.');
643 if (NULL == optionstr)
646 GNUNET_free (plugin);
647 return GNUNET_SYSERR;
651 options = atol (optionstr);
652 address = strchr (optionstr, '.');
656 GNUNET_free (plugin);
657 return GNUNET_SYSERR;
663 GNUNET_STRINGS_to_address_ip (address, strlen (address),
667 GNUNET_free (plugin);
668 return GNUNET_SYSERR;
671 GNUNET_free (plugin);
672 switch (socket_address.ss_family)
676 struct IPv4TcpAddress *t4;
677 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
678 t4 = GNUNET_new (struct IPv4TcpAddress);
679 t4->options = htonl (options);
680 t4->ipv4_addr = in4->sin_addr.s_addr;
681 t4->t4_port = in4->sin_port;
683 *added = sizeof (struct IPv4TcpAddress);
688 struct IPv6TcpAddress *t6;
689 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
690 t6 = GNUNET_new (struct IPv6TcpAddress);
691 t6->options = htonl (options);
692 t6->ipv6_addr = in6->sin6_addr;
693 t6->t6_port = in6->sin6_port;
695 *added = sizeof (struct IPv6TcpAddress);
699 return GNUNET_SYSERR;
705 * Closure for #session_lookup_by_client_it().
707 struct SessionClientCtx
710 * Client we are looking for.
712 const struct GNUNET_SERVER_Client *client;
715 * Session that was found.
722 session_lookup_by_client_it (void *cls,
723 const struct GNUNET_PeerIdentity *key,
726 struct SessionClientCtx *sc_ctx = cls;
727 struct Session *s = value;
729 if (s->client == sc_ctx->client)
739 * Find the session handle for the given client.
740 * Currently uses both the hashmap and the client
741 * context, as the client context is new and the
742 * logic still needs to be tested.
744 * @param plugin the plugin
745 * @param client which client to find the session handle for
746 * @return NULL if no matching session exists
748 static struct Session *
749 lookup_session_by_client (struct Plugin *plugin,
750 struct GNUNET_SERVER_Client *client)
753 struct SessionClientCtx sc_ctx;
755 ret = GNUNET_SERVER_client_get_user_context (client, struct Session);
756 sc_ctx.client = client;
758 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
759 &session_lookup_by_client_it, &sc_ctx);
760 /* check both methods yield the same result */
761 GNUNET_break (ret == sc_ctx.ret);
767 * Functions with this signature are called whenever we need
768 * to close a session due to a disconnect or failure to
769 * establish a connection.
771 * @param cls the `struct Plugin`
772 * @param session session to close down
773 * @return #GNUNET_OK on success
776 tcp_disconnect_session (void *cls,
777 struct Session *session)
779 struct Plugin *plugin = cls;
780 struct PendingMessage *pm;
782 LOG (GNUNET_ERROR_TYPE_DEBUG,
783 "Disconnecting session of peer `%s' address `%s'\n",
784 GNUNET_i2s (&session->target),
785 tcp_address_to_string (NULL, session->addr, session->addrlen));
787 if (GNUNET_SCHEDULER_NO_TASK != session->timeout_task)
789 GNUNET_SCHEDULER_cancel (session->timeout_task);
790 session->timeout_task = GNUNET_SCHEDULER_NO_TASK;
794 GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap,
798 GNUNET_STATISTICS_update (session->plugin->env->stats,
799 gettext_noop ("# TCP sessions active"), -1,
804 GNUNET_assert (GNUNET_YES ==
805 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
809 if (NULL != session->client)
810 GNUNET_SERVER_client_set_user_context (session->client,
814 if (NULL != session->transmit_handle)
816 GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
817 session->transmit_handle = NULL;
819 session->plugin->env->session_end (session->plugin->env->cls,
820 &session->target, session);
822 if (GNUNET_SCHEDULER_NO_TASK != session->nat_connection_timeout)
824 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
825 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
828 while (NULL != (pm = session->pending_messages_head))
830 LOG (GNUNET_ERROR_TYPE_DEBUG,
832 NULL ? "Could not deliver message to `%4s'.\n" :
833 "Could not deliver message to `%4s', notifying.\n",
834 GNUNET_i2s (&session->target));
835 GNUNET_STATISTICS_update (session->plugin->env->stats,
836 gettext_noop ("# bytes currently in TCP buffers"),
837 -(int64_t) pm->message_size, GNUNET_NO);
838 GNUNET_STATISTICS_update (session->plugin->env->stats,
840 ("# bytes discarded by TCP (disconnect)"),
841 pm->message_size, GNUNET_NO);
842 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
843 session->pending_messages_tail, pm);
844 if (NULL != pm->transmit_cont)
845 pm->transmit_cont (pm->transmit_cont_cls, &session->target,
846 GNUNET_SYSERR, pm->message_size, 0);
849 if (session->receive_delay_task != GNUNET_SCHEDULER_NO_TASK)
851 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
852 if (NULL != session->client)
853 GNUNET_SERVER_receive_done (session->client, GNUNET_SYSERR);
855 if (NULL != session->client)
857 GNUNET_SERVER_client_disconnect (session->client);
858 GNUNET_SERVER_client_drop (session->client);
859 session->client = NULL;
861 GNUNET_free_non_null (session->addr);
862 GNUNET_assert (NULL == session->transmit_handle);
863 GNUNET_free (session);
869 * Function that is called to get the keepalive factor.
870 * GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
871 * calculate the interval between keepalive packets.
873 * @param cls closure with the `struct Plugin`
874 * @return keepalive factor
877 tcp_query_keepalive_factor (void *cls)
884 * Session was idle, so disconnect it
886 * @param cls the `struct Session` of the idle session
887 * @param tc scheduler context
890 session_timeout (void *cls,
891 const struct GNUNET_SCHEDULER_TaskContext *tc)
893 struct Session *s = cls;
895 s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
897 "Session %p was idle for %s, disconnecting\n",
899 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
901 /* call session destroy function */
902 tcp_disconnect_session (s->plugin, s);
907 * Increment session timeout due to activity
909 * @param s session to increment timeout for
912 reschedule_session_timeout (struct Session *s)
914 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
915 GNUNET_SCHEDULER_cancel (s->timeout_task);
916 s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
920 "Timeout rescheduled for session %p set to %s\n",
922 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
928 * Create a new session. Also queues a welcome message.
930 * @param plugin the plugin
931 * @param target peer to connect to
932 * @param client client to use, reference counter must have already been increased
933 * @param is_nat this a NAT session, we should wait for a client to
934 * connect to us from an address, then assign that to
936 * @return new session object
938 static struct Session *
939 create_session (struct Plugin *plugin,
940 const struct GNUNET_PeerIdentity *target,
941 struct GNUNET_SERVER_Client *client, int is_nat)
943 struct Session *session;
944 struct PendingMessage *pm;
945 struct WelcomeMessage welcome;
947 if (GNUNET_YES != is_nat)
948 GNUNET_assert (NULL != client);
950 GNUNET_assert (NULL == client);
952 LOG (GNUNET_ERROR_TYPE_DEBUG,
953 "Creating new session for peer `%4s'\n",
954 GNUNET_i2s (target));
955 session = GNUNET_new (struct Session);
956 session->last_activity = GNUNET_TIME_absolute_get ();
957 session->plugin = plugin;
958 session->is_nat = is_nat;
959 session->client = client;
960 session->target = *target;
961 session->expecting_welcome = GNUNET_YES;
962 session->ats_address_network_type = GNUNET_ATS_NET_UNSPECIFIED;
963 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
964 sizeof (struct WelcomeMessage));
965 pm->msg = (const char *) &pm[1];
966 pm->message_size = sizeof (struct WelcomeMessage);
967 welcome.header.size = htons (sizeof (struct WelcomeMessage));
968 welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
969 welcome.clientIdentity = *plugin->env->my_identity;
970 memcpy (&pm[1], &welcome, sizeof (welcome));
971 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
972 GNUNET_STATISTICS_update (plugin->env->stats,
973 gettext_noop ("# bytes currently in TCP buffers"),
974 pm->message_size, GNUNET_NO);
975 GNUNET_CONTAINER_DLL_insert (session->pending_messages_head,
976 session->pending_messages_tail, pm);
977 if (GNUNET_YES != is_nat)
979 GNUNET_STATISTICS_update (plugin->env->stats,
980 gettext_noop ("# TCP sessions active"), 1,
983 session->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
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);
1001 * Function called to notify a client about the socket
1002 * being ready to queue more data. "buf" will be
1003 * NULL and "size" zero if the socket was closed for
1004 * writing in the meantime.
1006 * @param cls closure
1007 * @param size number of bytes available in buf
1008 * @param buf where the callee should write the message
1009 * @return number of bytes written to buf
1012 do_transmit (void *cls, size_t size, void *buf)
1014 struct Session *session = cls;
1015 struct GNUNET_PeerIdentity pid;
1016 struct Plugin *plugin;
1017 struct PendingMessage *pos;
1018 struct PendingMessage *hd;
1019 struct PendingMessage *tl;
1020 struct GNUNET_TIME_Absolute now;
1024 session->transmit_handle = NULL;
1025 plugin = session->plugin;
1028 LOG (GNUNET_ERROR_TYPE_DEBUG,
1029 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
1030 GNUNET_i2s (&session->target));
1031 /* timeout; cancel all messages that have already expired */
1035 now = GNUNET_TIME_absolute_get ();
1036 while ((NULL != (pos = session->pending_messages_head)) &&
1037 (pos->timeout.abs_value_us <= now.abs_value_us))
1039 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1040 session->pending_messages_tail, pos);
1041 LOG (GNUNET_ERROR_TYPE_DEBUG,
1042 "Failed to transmit %u byte message to `%4s'.\n",
1043 pos->message_size, GNUNET_i2s (&session->target));
1044 ret += pos->message_size;
1045 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
1047 /* do this call before callbacks (so that if callbacks destroy
1048 * session, they have a chance to cancel actions done by this
1050 process_pending_messages (session);
1051 pid = session->target;
1052 /* no do callbacks and do not use session again since
1053 * the callbacks may abort the session */
1054 while (NULL != (pos = hd))
1056 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
1057 if (pos->transmit_cont != NULL)
1058 pos->transmit_cont (pos->transmit_cont_cls, &pid, GNUNET_SYSERR, pos->message_size, 0);
1061 GNUNET_STATISTICS_update (plugin->env->stats,
1062 gettext_noop ("# bytes currently in TCP buffers"),
1063 -(int64_t) ret, GNUNET_NO);
1064 GNUNET_STATISTICS_update (plugin->env->stats,
1066 ("# bytes discarded by TCP (timeout)"), ret,
1070 /* copy all pending messages that would fit */
1075 while (NULL != (pos = session->pending_messages_head))
1077 if (ret + pos->message_size > size)
1079 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1080 session->pending_messages_tail, pos);
1081 GNUNET_assert (size >= pos->message_size);
1082 LOG (GNUNET_ERROR_TYPE_DEBUG,
1083 "Transmitting message of type %u\n",
1084 ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type));
1085 /* FIXME: this memcpy can be up to 7% of our total runtime */
1086 memcpy (cbuf, pos->msg, pos->message_size);
1087 cbuf += pos->message_size;
1088 ret += pos->message_size;
1089 size -= pos->message_size;
1090 GNUNET_CONTAINER_DLL_insert_tail (hd, tl, pos);
1092 /* schedule 'continuation' before callbacks so that callbacks that
1093 * cancel everything don't cause us to use a session that no longer
1095 process_pending_messages (session);
1096 session->last_activity = GNUNET_TIME_absolute_get ();
1097 pid = session->target;
1098 /* we'll now call callbacks that may cancel the session; hence
1099 * we should not use 'session' after this point */
1100 while (NULL != (pos = hd))
1102 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
1103 if (pos->transmit_cont != NULL)
1104 pos->transmit_cont (pos->transmit_cont_cls, &pid, GNUNET_OK, pos->message_size, pos->message_size); /* FIXME: include TCP overhead */
1107 GNUNET_assert (hd == NULL);
1108 GNUNET_assert (tl == NULL);
1109 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes\n",
1111 GNUNET_STATISTICS_update (plugin->env->stats,
1112 gettext_noop ("# bytes currently in TCP buffers"),
1113 -(int64_t) ret, GNUNET_NO);
1114 GNUNET_STATISTICS_update (plugin->env->stats,
1115 gettext_noop ("# bytes transmitted via TCP"), ret,
1122 * If we have pending messages, ask the server to
1123 * transmit them (schedule the respective tasks, etc.)
1125 * @param session for which session should we do this
1128 process_pending_messages (struct Session *session)
1130 struct PendingMessage *pm;
1132 GNUNET_assert (NULL != session->client);
1133 if (NULL != session->transmit_handle)
1135 if (NULL == (pm = session->pending_messages_head))
1138 session->transmit_handle =
1139 GNUNET_SERVER_notify_transmit_ready (session->client, pm->message_size,
1140 GNUNET_TIME_absolute_get_remaining
1141 (pm->timeout), &do_transmit,
1148 * Closure for #session_it().
1150 struct FindSessionContext
1153 * Session we are looking for.
1158 * Set to #GNUNET_OK if we found the session.
1165 * Function called to check if a session is in our maps.
1167 * @param cls the `struct FindSessionContext`
1168 * @param key peer identity
1169 * @param value session in the map
1170 * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session
1173 session_it (void *cls,
1174 const struct GNUNET_PeerIdentity *key,
1177 struct FindSessionContext *res = cls;
1178 struct Session *session = value;
1180 if (res->s == session)
1182 res->res = GNUNET_OK;
1190 * Check that the given session is known to the plugin and
1191 * is in one of our maps.
1193 * @param plugin the plugin to check against
1194 * @param session the session to check
1195 * @return #GNUNET_OK if all is well, #GNUNET_SYSERR if the session is invalid
1198 find_session (struct Plugin *plugin,
1199 struct Session *session)
1201 struct FindSessionContext session_map_res;
1202 struct FindSessionContext nat_map_res;
1204 session_map_res.s = session;
1205 session_map_res.res = GNUNET_SYSERR;
1206 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
1207 &session_it, &session_map_res);
1208 if (GNUNET_SYSERR != session_map_res.res)
1210 nat_map_res.s = session;
1211 nat_map_res.res = GNUNET_SYSERR;
1212 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
1213 &session_it, &nat_map_res);
1214 if (GNUNET_SYSERR != nat_map_res.res)
1217 return GNUNET_SYSERR;
1223 * Function that can be used by the transport service to transmit
1224 * a message using the plugin. Note that in the case of a
1225 * peer disconnecting, the continuation MUST be called
1226 * prior to the disconnect notification itself. This function
1227 * will be called with this peer's HELLO message to initiate
1228 * a fresh connection to another peer.
1230 * @param cls closure
1231 * @param session which session must be used
1232 * @param msgbuf the message to transmit
1233 * @param msgbuf_size number of bytes in 'msgbuf'
1234 * @param priority how important is the message (most plugins will
1235 * ignore message priority and just FIFO)
1236 * @param to how long to wait at most for the transmission (does not
1237 * require plugins to discard the message after the timeout,
1238 * just advisory for the desired delay; most plugins will ignore
1240 * @param cont continuation to call once the message has
1241 * been transmitted (or if the transport is ready
1242 * for the next transmission call; or if the
1243 * peer disconnected...); can be NULL
1244 * @param cont_cls closure for @a cont
1245 * @return number of bytes used (on the physical network, with overheads);
1246 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1247 * and does NOT mean that the message was not transmitted (DV)
1250 tcp_plugin_send (void *cls,
1251 struct Session *session,
1252 const char *msgbuf, size_t msgbuf_size,
1253 unsigned int priority,
1254 struct GNUNET_TIME_Relative to,
1255 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1257 struct Plugin * plugin = cls;
1258 struct PendingMessage *pm;
1261 if (GNUNET_SYSERR == find_session (plugin, session))
1263 LOG (GNUNET_ERROR_TYPE_ERROR,
1264 _("Trying to send with invalid session %p\n"));
1266 return GNUNET_SYSERR;
1269 /* create new message entry */
1270 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1271 pm->msg = (const char *) &pm[1];
1272 memcpy (&pm[1], msgbuf, msgbuf_size);
1273 pm->message_size = msgbuf_size;
1274 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1275 pm->transmit_cont = cont;
1276 pm->transmit_cont_cls = cont_cls;
1278 LOG (GNUNET_ERROR_TYPE_DEBUG,
1279 "Asked to transmit %u bytes to `%s', added message to list.\n",
1280 msgbuf_size, GNUNET_i2s (&session->target));
1283 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
1287 GNUNET_assert (NULL != session->client);
1288 GNUNET_SERVER_client_set_timeout (session->client,
1289 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1290 GNUNET_STATISTICS_update (plugin->env->stats,
1291 gettext_noop ("# bytes currently in TCP buffers"),
1292 msgbuf_size, GNUNET_NO);
1294 /* append pm to pending_messages list */
1295 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1296 session->pending_messages_tail, pm);
1298 process_pending_messages (session);
1301 else if (GNUNET_YES ==
1302 GNUNET_CONTAINER_multipeermap_contains_value(plugin->nat_wait_conns,
1306 LOG (GNUNET_ERROR_TYPE_DEBUG,
1307 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1308 GNUNET_i2s (&session->target));
1309 GNUNET_STATISTICS_update (plugin->env->stats,
1310 gettext_noop ("# bytes currently in TCP buffers"),
1311 msgbuf_size, GNUNET_NO);
1313 /* append pm to pending_messages list */
1314 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1315 session->pending_messages_tail, pm);
1320 LOG (GNUNET_ERROR_TYPE_ERROR,
1321 "Invalid session %p\n", session);
1330 return GNUNET_SYSERR; /* session does not exist here */
1336 * Closure for #session_lookup_it().
1341 * Address we are looking for.
1346 * Number of bytes in @e addr.
1351 * Where to store the session (if we found it).
1353 struct Session *result;
1358 * Look for a session by address.
1360 * @param cls the `struct SessionItCtx`
1362 * @param value a `struct Session`
1363 * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session
1366 session_lookup_it (void *cls,
1367 const struct GNUNET_PeerIdentity *key,
1370 struct SessionItCtx * si_ctx = cls;
1371 struct Session * session = value;
1373 if (session->addrlen != si_ctx->addrlen)
1375 if (0 != memcmp (session->addr, si_ctx->addr, si_ctx->addrlen))
1377 /* Found existing session */
1378 si_ctx->result = session;
1384 * Task cleaning up a NAT connection attempt after timeout
1386 * @param cls the `struct Session`
1387 * @param tc scheduler context (unused)
1390 nat_connect_timeout (void *cls,
1391 const struct GNUNET_SCHEDULER_TaskContext *tc)
1393 struct Session *session = cls;
1395 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
1396 LOG (GNUNET_ERROR_TYPE_DEBUG,
1397 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1398 GNUNET_i2s (&session->target),
1399 tcp_address_to_string (NULL,
1400 session->addr, session->addrlen));
1401 tcp_disconnect_session (session->plugin,
1407 tcp_plugin_update_session_timeout (void *cls,
1408 const struct GNUNET_PeerIdentity *peer,
1409 struct Session *session)
1411 struct Plugin *plugin = cls;
1413 if (GNUNET_SYSERR == find_session (plugin, session))
1415 reschedule_session_timeout (session);
1420 * Create a new session to transmit data to the target
1421 * This session will used to send data to this peer and the plugin will
1422 * notify us by calling the env->session_end function
1424 * @param cls closure
1425 * @param address the address to use
1426 * @return the session if the address is valid, NULL otherwise
1428 static struct Session *
1429 tcp_plugin_get_session (void *cls,
1430 const struct GNUNET_HELLO_Address *address)
1432 struct Plugin *plugin = cls;
1433 struct Session *session = NULL;
1437 struct GNUNET_CONNECTION_Handle *sa;
1438 struct sockaddr_in a4;
1439 struct sockaddr_in6 a6;
1440 const struct IPv4TcpAddress *t4;
1441 const struct IPv6TcpAddress *t6;
1442 struct GNUNET_ATS_Information ats;
1443 unsigned int is_natd = GNUNET_NO;
1446 addrlen = address->address_length;
1447 LOG (GNUNET_ERROR_TYPE_DEBUG,
1448 "Trying to get session for `%s' address of peer `%s'\n",
1449 tcp_address_to_string(NULL, address->address, address->address_length),
1450 GNUNET_i2s (&address->peer));
1452 /* look for existing session */
1454 GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
1457 struct SessionItCtx si_ctx;
1459 si_ctx.addr = (void *) address->address;
1460 si_ctx.addrlen = address->address_length;
1462 si_ctx.result = NULL;
1464 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1466 &session_lookup_it, &si_ctx);
1467 if (si_ctx.result != NULL)
1469 session = si_ctx.result;
1470 LOG (GNUNET_ERROR_TYPE_DEBUG,
1471 "Found existing session for `%s' address `%s' session %p\n",
1472 GNUNET_i2s (&address->peer),
1473 tcp_address_to_string(NULL, address->address, address->address_length),
1477 LOG (GNUNET_ERROR_TYPE_DEBUG,
1478 "Existing sessions did not match address `%s' or peer `%s'\n",
1479 tcp_address_to_string(NULL, address->address, address->address_length),
1480 GNUNET_i2s (&address->peer));
1483 if (addrlen == sizeof (struct IPv6TcpAddress))
1485 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1486 t6 = address->address;
1488 memset (&a6, 0, sizeof (a6));
1489 #if HAVE_SOCKADDR_IN_SIN_LEN
1490 a6.sin6_len = sizeof (a6);
1492 a6.sin6_family = AF_INET6;
1493 a6.sin6_port = t6->t6_port;
1494 if (t6->t6_port == 0)
1495 is_natd = GNUNET_YES;
1496 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1500 else if (addrlen == sizeof (struct IPv4TcpAddress))
1502 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1503 t4 = address->address;
1505 memset (&a4, 0, sizeof (a4));
1506 #if HAVE_SOCKADDR_IN_SIN_LEN
1507 a4.sin_len = sizeof (a4);
1509 a4.sin_family = AF_INET;
1510 a4.sin_port = t4->t4_port;
1511 if (t4->t4_port == 0)
1512 is_natd = GNUNET_YES;
1513 a4.sin_addr.s_addr = t4->ipv4_addr;
1519 GNUNET_STATISTICS_update (plugin->env->stats,
1521 ("# requests to create session with invalid address"),
1526 ats = plugin->env->get_address_type (plugin->env->cls, sb, sbs);
1528 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1530 /* NAT client only works with IPv4 addresses */
1534 if (plugin->cur_connections >= plugin->max_connections)
1540 if ((is_natd == GNUNET_YES) &&
1542 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1545 /* Only do one NAT punch attempt per peer identity */
1549 if ((is_natd == GNUNET_YES) && (NULL != plugin->nat) &&
1551 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1554 LOG (GNUNET_ERROR_TYPE_DEBUG,
1555 "Found valid IPv4 NAT address (creating session)!\n") ;
1556 session = create_session (plugin,
1560 session->addrlen = 0;
1561 session->addr = NULL;
1562 session->ats_address_network_type = (enum GNUNET_ATS_Network_Type) ntohl (ats.value);
1563 GNUNET_break (session->ats_address_network_type != GNUNET_ATS_NET_UNSPECIFIED);
1564 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
1565 &nat_connect_timeout,
1567 GNUNET_assert (session != NULL);
1568 GNUNET_assert (GNUNET_OK ==
1569 GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
1572 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1574 LOG (GNUNET_ERROR_TYPE_DEBUG,
1575 "Created NAT WAIT connection to `%4s' at `%s'\n",
1576 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1578 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1582 LOG (GNUNET_ERROR_TYPE_DEBUG,
1583 "Running NAT client for `%4s' at `%s' failed\n",
1584 GNUNET_i2s (&session->target), GNUNET_a2s (sb, sbs));
1585 tcp_disconnect_session (plugin, session);
1590 /* create new outbound session */
1591 GNUNET_assert (plugin->cur_connections <= plugin->max_connections);
1592 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1595 LOG (GNUNET_ERROR_TYPE_DEBUG,
1596 "Failed to create connection to `%4s' at `%s'\n",
1597 GNUNET_i2s (&address->peer), GNUNET_a2s (sb, sbs));
1600 plugin->cur_connections++;
1601 if (plugin->cur_connections == plugin->max_connections)
1602 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
1604 LOG (GNUNET_ERROR_TYPE_DEBUG,
1605 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1606 GNUNET_i2s (&address->peer),
1607 GNUNET_a2s (sb, sbs));
1609 session = create_session (plugin,
1611 GNUNET_SERVER_connect_socket (plugin->server, sa),
1613 session->addr = GNUNET_malloc (addrlen);
1614 memcpy (session->addr, address->address, addrlen);
1615 session->addrlen = addrlen;
1616 session->ats_address_network_type = (enum GNUNET_ATS_Network_Type) ntohl (ats.value);
1617 GNUNET_break (session->ats_address_network_type != GNUNET_ATS_NET_UNSPECIFIED);
1618 GNUNET_SERVER_client_set_user_context (session->client, session);
1619 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1622 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1623 LOG (GNUNET_ERROR_TYPE_DEBUG,
1624 "Creating new session for `%s' address `%s' session %p\n",
1625 GNUNET_i2s (&address->peer),
1626 tcp_address_to_string(NULL, address->address, address->address_length),
1628 /* Send TCP Welcome */
1629 process_pending_messages (session);
1636 session_disconnect_it (void *cls,
1637 const struct GNUNET_PeerIdentity *key,
1640 struct Plugin *plugin = cls;
1641 struct Session *session = value;
1643 GNUNET_STATISTICS_update (session->plugin->env->stats,
1645 ("# transport-service disconnect requests for TCP"),
1647 tcp_disconnect_session (plugin,
1654 * Function that can be called to force a disconnect from the
1655 * specified neighbour. This should also cancel all previously
1656 * scheduled transmissions. Obviously the transmission may have been
1657 * partially completed already, which is OK. The plugin is supposed
1658 * to close the connection (if applicable) and no longer call the
1659 * transmit continuation(s).
1661 * Finally, plugin MUST NOT call the services's receive function to
1662 * notify the service that the connection to the specified target was
1663 * closed after a getting this call.
1665 * @param cls closure
1666 * @param target peer for which the last transmission is
1670 tcp_plugin_disconnect (void *cls,
1671 const struct GNUNET_PeerIdentity *target)
1673 struct Plugin *plugin = cls;
1675 LOG (GNUNET_ERROR_TYPE_DEBUG,
1676 "Disconnecting peer `%4s'\n",
1677 GNUNET_i2s (target));
1678 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap, target,
1679 &session_disconnect_it, plugin);
1680 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns, target,
1681 &session_disconnect_it, plugin);
1686 * Running pretty printers: head
1688 static struct PrettyPrinterContext *ppc_dll_head;
1691 * Running pretty printers: tail
1693 static struct PrettyPrinterContext *ppc_dll_tail;
1696 * Context for address to string conversion.
1698 struct PrettyPrinterContext
1703 struct PrettyPrinterContext *next;
1708 struct PrettyPrinterContext *prev;
1713 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
1718 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
1721 * Function to call with the result.
1723 GNUNET_TRANSPORT_AddressStringCallback asc;
1726 * Clsoure for 'asc'.
1731 * Port to add after the IP address.
1748 ppc_cancel_task (void *cls,
1749 const struct GNUNET_SCHEDULER_TaskContext *tc)
1751 struct PrettyPrinterContext *ppc = cls;
1753 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1754 if (NULL != ppc->resolver_handle)
1756 GNUNET_RESOLVER_request_cancel (ppc->resolver_handle);
1757 ppc->resolver_handle = NULL;
1759 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, ppc);
1765 * Append our port and forward the result.
1767 * @param cls the 'struct PrettyPrinterContext*'
1768 * @param hostname hostname part of the address
1771 append_port (void *cls, const char *hostname)
1773 struct PrettyPrinterContext *ppc = cls;
1774 struct PrettyPrinterContext *cur;
1777 if (NULL == hostname)
1779 ppc->asc (ppc->asc_cls, NULL);
1780 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, ppc);
1781 GNUNET_SCHEDULER_cancel (ppc->timeout_task);
1782 ppc->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1783 ppc->resolver_handle = NULL;
1787 for (cur = ppc_dll_head; (NULL != cur); cur = cur->next)
1796 if (GNUNET_YES == ppc->ipv6)
1797 GNUNET_asprintf (&ret,
1804 GNUNET_asprintf (&ret,
1810 ppc->asc (ppc->asc_cls, ret);
1816 * Convert the transports address to a nice, human-readable
1819 * @param cls closure
1820 * @param type name of the transport that generated the address
1821 * @param addr one of the addresses of the host, NULL for the last address
1822 * the specific address format depends on the transport
1823 * @param addrlen length of the address
1824 * @param numeric should (IP) addresses be displayed in numeric form?
1825 * @param timeout after how long should we give up?
1826 * @param asc function to call on each string
1827 * @param asc_cls closure for asc
1830 tcp_plugin_address_pretty_printer (void *cls, const char *type,
1831 const void *addr, size_t addrlen,
1833 struct GNUNET_TIME_Relative timeout,
1834 GNUNET_TRANSPORT_AddressStringCallback asc,
1837 struct PrettyPrinterContext *ppc;
1840 struct sockaddr_in a4;
1841 struct sockaddr_in6 a6;
1842 const struct IPv4TcpAddress *t4;
1843 const struct IPv6TcpAddress *t6;
1847 if (addrlen == sizeof (struct IPv6TcpAddress))
1850 memset (&a6, 0, sizeof (a6));
1851 a6.sin6_family = AF_INET6;
1852 a6.sin6_port = t6->t6_port;
1853 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof (struct in6_addr));
1854 port = ntohs (t6->t6_port);
1855 options = ntohl (t6->options);
1859 else if (addrlen == sizeof (struct IPv4TcpAddress))
1862 memset (&a4, 0, sizeof (a4));
1863 a4.sin_family = AF_INET;
1864 a4.sin_port = t4->t4_port;
1865 a4.sin_addr.s_addr = t4->ipv4_addr;
1866 port = ntohs (t4->t4_port);
1867 options = ntohl (t4->options);
1871 else if (0 == addrlen)
1873 asc (asc_cls, TRANSPORT_SESSION_INBOUND_STRING);
1874 asc (asc_cls, NULL);
1879 /* invalid address */
1880 GNUNET_break_op (0);
1881 asc (asc_cls, NULL);
1884 ppc = GNUNET_new (struct PrettyPrinterContext);
1885 if (addrlen == sizeof (struct IPv6TcpAddress))
1886 ppc->ipv6 = GNUNET_YES;
1888 ppc->ipv6 = GNUNET_NO;
1890 ppc->asc_cls = asc_cls;
1892 ppc->options = options;
1893 ppc->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(timeout, 2),
1894 &ppc_cancel_task, ppc);
1895 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric,
1898 if (NULL != ppc->resolver_handle)
1900 //GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Adding request %p\n", ppc);
1901 GNUNET_CONTAINER_DLL_insert (ppc_dll_head, ppc_dll_tail, ppc);
1912 * Check if the given port is plausible (must be either our listen
1913 * port or our advertised port), or any port if we are behind NAT
1914 * and do not have a port open. If it is neither, we return
1917 * @param plugin global variables
1918 * @param in_port port number to check
1919 * @return #GNUNET_OK if port is either open_port or adv_port
1922 check_port (struct Plugin *plugin, uint16_t in_port)
1924 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1926 return GNUNET_SYSERR;
1931 * Function that will be called to check if a binary address for this
1932 * plugin is well-formed and corresponds to an address for THIS peer
1933 * (as per our configuration). Naturally, if absolutely necessary,
1934 * plugins can be a bit conservative in their answer, but in general
1935 * plugins should make sure that the address does not redirect
1936 * traffic to a 3rd party that might try to man-in-the-middle our
1939 * @param cls closure, our `struct Plugin *`
1940 * @param addr pointer to the address
1941 * @param addrlen length of addr
1942 * @return #GNUNET_OK if this is a plausible address for this peer
1943 * and transport, #GNUNET_SYSERR if not
1946 tcp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
1948 struct Plugin *plugin = cls;
1949 struct IPv4TcpAddress *v4;
1950 struct IPv6TcpAddress *v6;
1952 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1953 (addrlen != sizeof (struct IPv6TcpAddress)))
1955 GNUNET_break_op (0);
1956 return GNUNET_SYSERR;
1959 if (addrlen == sizeof (struct IPv4TcpAddress))
1961 v4 = (struct IPv4TcpAddress *) addr;
1962 if (0 != memcmp (&v4->options, &myoptions, sizeof (myoptions)))
1965 return GNUNET_SYSERR;
1967 if (GNUNET_OK != check_port (plugin, ntohs (v4->t4_port)))
1968 return GNUNET_SYSERR;
1970 GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
1971 sizeof (struct in_addr)))
1972 return GNUNET_SYSERR;
1976 v6 = (struct IPv6TcpAddress *) addr;
1977 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1979 GNUNET_break_op (0);
1980 return GNUNET_SYSERR;
1982 if (0 != memcmp (&v6->options, &myoptions, sizeof (myoptions)))
1985 return GNUNET_SYSERR;
1987 if (GNUNET_OK != check_port (plugin, ntohs (v6->t6_port)))
1988 return GNUNET_SYSERR;
1990 GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
1991 sizeof (struct in6_addr)))
1992 return GNUNET_SYSERR;
1999 * We've received a nat probe from this peer via TCP. Finish
2000 * creating the client session and resume sending of queued
2003 * @param cls closure
2004 * @param client identification of the client
2005 * @param message the actual message
2008 handle_tcp_nat_probe (void *cls,
2009 struct GNUNET_SERVER_Client *client,
2010 const struct GNUNET_MessageHeader *message)
2012 struct Plugin *plugin = cls;
2013 struct Session *session;
2014 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
2017 struct IPv4TcpAddress *t4;
2018 struct IPv6TcpAddress *t6;
2019 const struct sockaddr_in *s4;
2020 const struct sockaddr_in6 *s6;
2022 LOG (GNUNET_ERROR_TYPE_DEBUG,
2023 "Received NAT probe\n");
2024 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
2025 * a connection to this peer by running gnunet-nat-client. This peer
2026 * received the punch message and now wants us to use the new connection
2027 * as the default for that peer. Do so and then send a WELCOME message
2028 * so we can really be connected!
2030 if (ntohs (message->size) != sizeof (struct TCP_NAT_ProbeMessage))
2032 GNUNET_break_op (0);
2033 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2037 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
2039 memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
2040 sizeof (struct GNUNET_PeerIdentity)))
2042 /* refuse connections from ourselves */
2043 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2048 GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
2049 &tcp_nat_probe->clientIdentity);
2050 if (session == NULL)
2052 LOG (GNUNET_ERROR_TYPE_DEBUG,
2053 "Did NOT find session for NAT probe!\n");
2054 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2057 LOG (GNUNET_ERROR_TYPE_DEBUG,
2058 "Found session for NAT probe!\n");
2060 if (session->nat_connection_timeout != GNUNET_SCHEDULER_NO_TASK)
2062 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
2063 session->nat_connection_timeout = GNUNET_SCHEDULER_NO_TASK;
2066 if (GNUNET_OK != GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2069 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2070 tcp_disconnect_session (plugin, session);
2073 GNUNET_assert (GNUNET_CONTAINER_multipeermap_remove
2074 (plugin->nat_wait_conns,
2075 &tcp_nat_probe->clientIdentity,
2076 session) == GNUNET_YES);
2077 GNUNET_SERVER_client_set_user_context (client, session);
2078 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2079 &session->target, session,
2080 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2081 session->last_activity = GNUNET_TIME_absolute_get ();
2082 session->inbound = GNUNET_NO;
2083 LOG (GNUNET_ERROR_TYPE_DEBUG,
2084 "Found address `%s' for incoming connection\n",
2085 GNUNET_a2s (vaddr, alen));
2086 switch (((const struct sockaddr *) vaddr)->sa_family)
2090 t4 = GNUNET_new (struct IPv4TcpAddress);
2092 t4->t4_port = s4->sin_port;
2093 t4->ipv4_addr = s4->sin_addr.s_addr;
2095 session->addrlen = sizeof (struct IPv4TcpAddress);
2099 t6 = GNUNET_new (struct IPv6TcpAddress);
2101 t6->t6_port = s6->sin6_port;
2102 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
2104 session->addrlen = sizeof (struct IPv6TcpAddress);
2107 GNUNET_break_op (0);
2108 LOG (GNUNET_ERROR_TYPE_DEBUG,
2109 "Bad address for incoming connection!\n");
2110 GNUNET_free (vaddr);
2111 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2112 tcp_disconnect_session (plugin, session);
2115 GNUNET_free (vaddr);
2116 GNUNET_break (NULL == session->client);
2117 GNUNET_SERVER_client_keep (client);
2118 session->client = client;
2119 GNUNET_STATISTICS_update (plugin->env->stats,
2120 gettext_noop ("# TCP sessions active"), 1,
2122 process_pending_messages (session);
2123 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2128 * We've received a welcome from this peer via TCP. Possibly create a
2129 * fresh client record and send back our welcome.
2131 * @param cls closure
2132 * @param client identification of the client
2133 * @param message the actual message
2136 handle_tcp_welcome (void *cls, struct GNUNET_SERVER_Client *client,
2137 const struct GNUNET_MessageHeader *message)
2139 struct Plugin *plugin = cls;
2140 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2141 struct Session *session;
2144 struct IPv4TcpAddress *t4;
2145 struct IPv6TcpAddress *t6;
2146 const struct sockaddr_in *s4;
2147 const struct sockaddr_in6 *s6;
2148 struct GNUNET_ATS_Information ats;
2151 memcmp (&wm->clientIdentity, plugin->env->my_identity,
2152 sizeof (struct GNUNET_PeerIdentity)))
2154 /* refuse connections from ourselves */
2155 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2156 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2158 LOG (GNUNET_ERROR_TYPE_WARNING,
2159 "Received %s message from my own identity `%4s' on address `%s'\n",
2160 "WELCOME", GNUNET_i2s (&wm->clientIdentity), GNUNET_a2s (vaddr, alen));
2161 GNUNET_free (vaddr);
2163 GNUNET_break_op (0);
2166 LOG (GNUNET_ERROR_TYPE_DEBUG,
2167 "Received %s message from `%4s' %p\n", "WELCOME",
2168 GNUNET_i2s (&wm->clientIdentity), client);
2169 GNUNET_STATISTICS_update (plugin->env->stats,
2170 gettext_noop ("# TCP WELCOME messages received"), 1,
2172 session = lookup_session_by_client (plugin, client);
2173 if (NULL != session)
2176 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2178 LOG (GNUNET_ERROR_TYPE_DEBUG,
2179 "Found existing session %p for peer `%s'\n",
2181 GNUNET_a2s (vaddr, alen));
2182 GNUNET_free (vaddr);
2187 GNUNET_SERVER_client_keep (client);
2188 if (NULL != plugin->service) /* Otherwise value is incremented in tcp_access_check */
2189 plugin->cur_connections++;
2190 if (plugin->cur_connections == plugin->max_connections)
2191 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2193 session = create_session (plugin, &wm->clientIdentity, client, GNUNET_NO);
2194 session->inbound = GNUNET_YES;
2195 if (GNUNET_OK == GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2197 if (alen == sizeof (struct sockaddr_in))
2200 t4 = GNUNET_new (struct IPv4TcpAddress);
2201 t4->options = htonl (0);
2202 t4->t4_port = s4->sin_port;
2203 t4->ipv4_addr = s4->sin_addr.s_addr;
2205 session->addrlen = sizeof (struct IPv4TcpAddress);
2207 else if (alen == sizeof (struct sockaddr_in6))
2210 t6 = GNUNET_new (struct IPv6TcpAddress);
2211 t6->options = htonl (0);
2212 t6->t6_port = s6->sin6_port;
2213 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr));
2215 session->addrlen = sizeof (struct IPv6TcpAddress);
2218 ats = plugin->env->get_address_type (plugin->env->cls, vaddr ,alen);
2219 session->ats_address_network_type = (enum GNUNET_ATS_Network_Type) ntohl (ats.value);
2220 LOG (GNUNET_ERROR_TYPE_DEBUG,
2221 "Creating new session %p for peer `%s'\n",
2223 GNUNET_a2s (vaddr, alen));
2224 GNUNET_free (vaddr);
2225 GNUNET_SERVER_client_set_user_context (session->client, session);
2226 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2229 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2233 LOG (GNUNET_ERROR_TYPE_DEBUG,
2234 "Did not obtain TCP socket address for incoming connection\n");
2239 if (session->expecting_welcome != GNUNET_YES)
2241 GNUNET_break_op (0);
2242 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2246 session->last_activity = GNUNET_TIME_absolute_get ();
2247 session->expecting_welcome = GNUNET_NO;
2249 /* Notify transport and ATS about new session */
2250 if (GNUNET_YES == session->inbound)
2252 plugin->env->session_start (NULL,
2253 &wm->clientIdentity,
2255 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2256 (GNUNET_YES == session->inbound) ? 0 : session->addrlen,
2259 process_pending_messages (session);
2260 GNUNET_SERVER_client_set_timeout (client,
2261 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2262 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2267 * Task to signal the server that we can continue
2268 * receiving from the TCP client now.
2270 * @param cls the `struct Session*`
2271 * @param tc task context (unused)
2274 delayed_done (void *cls,
2275 const struct GNUNET_SCHEDULER_TaskContext *tc)
2277 struct Session *session = cls;
2279 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
2280 reschedule_session_timeout (session);
2282 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
2287 * We've received data for this peer via TCP. Unbox,
2288 * compute latency and forward.
2290 * @param cls closure
2291 * @param client identification of the client
2292 * @param message the actual message
2295 handle_tcp_data (void *cls, struct GNUNET_SERVER_Client *client,
2296 const struct GNUNET_MessageHeader *message)
2298 struct Plugin *plugin = cls;
2299 struct Session *session;
2300 struct GNUNET_TIME_Relative delay;
2303 type = ntohs (message->type);
2304 if ((GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2305 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type))
2307 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2308 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2311 session = lookup_session_by_client (plugin, client);
2312 if (NULL == session)
2314 /* No inbound session found */
2318 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2319 LOG (GNUNET_ERROR_TYPE_ERROR,
2320 "Received unexpected %u bytes of type %u from `%s'\n",
2321 (unsigned int) ntohs (message->size),
2322 (unsigned int) ntohs (message->type),
2323 GNUNET_a2s(vaddr, alen));
2324 GNUNET_break_op (0);
2325 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2326 GNUNET_free_non_null(vaddr);
2329 else if (GNUNET_YES == session->expecting_welcome)
2331 /* Session is expecting WELCOME message */
2335 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2336 LOG (GNUNET_ERROR_TYPE_ERROR,
2337 "Received unexpected %u bytes of type %u from `%s'\n",
2338 (unsigned int) ntohs (message->size),
2339 (unsigned int) ntohs (message->type),
2340 GNUNET_a2s(vaddr, alen));
2341 GNUNET_break_op (0);
2342 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2343 GNUNET_free_non_null(vaddr);
2347 session->last_activity = GNUNET_TIME_absolute_get ();
2348 LOG (GNUNET_ERROR_TYPE_DEBUG,
2349 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2350 (unsigned int) ntohs (message->size),
2351 (unsigned int) ntohs (message->type),
2352 GNUNET_i2s (&session->target));
2354 GNUNET_STATISTICS_update (plugin->env->stats,
2355 gettext_noop ("# bytes received via TCP"),
2356 ntohs (message->size), GNUNET_NO);
2357 struct GNUNET_ATS_Information distance;
2359 distance.type = htonl (GNUNET_ATS_NETWORK_TYPE);
2360 distance.value = htonl ((uint32_t) session->ats_address_network_type);
2361 GNUNET_break (session->ats_address_network_type != GNUNET_ATS_NET_UNSPECIFIED);
2363 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2367 delay = plugin->env->receive (plugin->env->cls,
2371 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2372 (GNUNET_YES == session->inbound) ? 0 : session->addrlen);
2373 plugin->env->update_address_metrics (plugin->env->cls,
2375 (GNUNET_YES == session->inbound) ? NULL : session->addr,
2376 (GNUNET_YES == session->inbound) ? 0 : session->addrlen,
2377 session, &distance, 1);
2378 reschedule_session_timeout (session);
2379 if (0 == delay.rel_value_us)
2381 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2385 LOG (GNUNET_ERROR_TYPE_DEBUG,
2386 "Throttling receiving from `%s' for %s\n",
2387 GNUNET_i2s (&session->target),
2388 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
2389 GNUNET_SERVER_disable_receive_done_warning (client);
2390 session->receive_delay_task =
2391 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2397 * Functions with this signature are called whenever a peer
2398 * is disconnected on the network level.
2400 * @param cls closure
2401 * @param client identification of the client
2404 disconnect_notify (void *cls, struct GNUNET_SERVER_Client *client)
2406 struct Plugin *plugin = cls;
2407 struct Session *session;
2411 session = lookup_session_by_client (plugin, client);
2412 if (session == NULL)
2413 return; /* unknown, nothing to do */
2414 LOG (GNUNET_ERROR_TYPE_DEBUG,
2415 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2416 GNUNET_i2s (&session->target),
2418 NULL) ? tcp_address_to_string (session->plugin,
2423 if (plugin->cur_connections == plugin->max_connections)
2424 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2426 if (plugin->cur_connections < 1)
2429 plugin->cur_connections--;
2431 GNUNET_STATISTICS_update (session->plugin->env->stats,
2433 ("# network-level TCP disconnect events"), 1,
2435 tcp_disconnect_session (plugin, session);
2440 * We can now send a probe message, copy into buffer to really send.
2442 * @param cls closure, a struct TCPProbeContext
2443 * @param size max size to copy
2444 * @param buf buffer to copy message to
2445 * @return number of bytes copied into buf
2448 notify_send_probe (void *cls, size_t size, void *buf)
2450 struct TCPProbeContext *tcp_probe_ctx = cls;
2451 struct Plugin *plugin = tcp_probe_ctx->plugin;
2454 tcp_probe_ctx->transmit_handle = NULL;
2455 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2459 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2460 GNUNET_free (tcp_probe_ctx);
2463 GNUNET_assert (size >= sizeof (tcp_probe_ctx->message));
2464 memcpy (buf, &tcp_probe_ctx->message, sizeof (tcp_probe_ctx->message));
2465 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2466 tcp_probe_ctx->sock);
2467 ret = sizeof (tcp_probe_ctx->message);
2468 GNUNET_free (tcp_probe_ctx);
2474 * Function called by the NAT subsystem suggesting another peer wants
2475 * to connect to us via connection reversal. Try to connect back to the
2478 * @param cls closure
2479 * @param addr address to try
2480 * @param addrlen number of bytes in @a addr
2483 try_connection_reversal (void *cls, const struct sockaddr *addr,
2486 struct Plugin *plugin = cls;
2487 struct GNUNET_CONNECTION_Handle *sock;
2488 struct TCPProbeContext *tcp_probe_ctx;
2491 * We have received an ICMP response, ostensibly from a peer
2492 * that wants to connect to us! Send a message to establish a connection.
2494 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, addr, addrlen);
2497 /* failed for some odd reason (out of sockets?); ignore attempt */
2501 /* FIXME: do we need to track these probe context objects so that
2502 * we can clean them up on plugin unload? */
2503 tcp_probe_ctx = GNUNET_new (struct TCPProbeContext);
2504 tcp_probe_ctx->message.header.size =
2505 htons (sizeof (struct TCP_NAT_ProbeMessage));
2506 tcp_probe_ctx->message.header.type =
2507 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2508 memcpy (&tcp_probe_ctx->message.clientIdentity, plugin->env->my_identity,
2509 sizeof (struct GNUNET_PeerIdentity));
2510 tcp_probe_ctx->plugin = plugin;
2511 tcp_probe_ctx->sock = sock;
2512 GNUNET_CONTAINER_DLL_insert (plugin->probe_head, plugin->probe_tail,
2514 tcp_probe_ctx->transmit_handle =
2515 GNUNET_CONNECTION_notify_transmit_ready (sock,
2516 ntohs (tcp_probe_ctx->
2517 message.header.size),
2518 GNUNET_TIME_UNIT_FOREVER_REL,
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 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->query_keepalive_factor = &tcp_query_keepalive_factor;
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 api->update_session_timeout = &tcp_plugin_update_session_timeout;
2677 plugin->service = service;
2678 if (NULL != service)
2680 plugin->server = GNUNET_SERVICE_get_server (service);
2685 GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-tcp",
2686 "TIMEOUT", &idle_timeout))
2688 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2689 "transport-tcp", "TIMEOUT");
2690 if (plugin->nat != NULL)
2691 GNUNET_NAT_unregister (plugin->nat);
2692 GNUNET_free (plugin);
2697 GNUNET_SERVER_create_with_sockets (&plugin_tcp_access_check, plugin,
2698 NULL, idle_timeout, GNUNET_YES);
2700 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2701 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2703 i < sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2705 plugin->handlers[i].callback_cls = plugin;
2707 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2708 GNUNET_SERVER_disconnect_notify (plugin->server, &disconnect_notify, plugin);
2709 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16, GNUNET_YES);
2711 LOG (GNUNET_ERROR_TYPE_INFO,
2712 _("TCP transport listening on port %llu\n"), bport);
2714 LOG (GNUNET_ERROR_TYPE_INFO,
2715 _("TCP transport not listening on any port (client only)\n"));
2717 LOG (GNUNET_ERROR_TYPE_INFO,
2718 _("TCP transport advertises itself as being on port %llu\n"),
2720 /* Initially set connections to 0 */
2721 GNUNET_assert (NULL != plugin->env->stats);
2722 GNUNET_STATISTICS_set (plugin->env->stats,
2723 gettext_noop ("# TCP sessions active"), 0,
2730 * Exit point from the plugin.
2732 * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions`
2736 libgnunet_plugin_transport_tcp_done (void *cls)
2738 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2739 struct Plugin *plugin = api->cls;
2740 struct TCPProbeContext *tcp_probe;
2741 struct PrettyPrinterContext *cur;
2742 struct PrettyPrinterContext *next;
2749 LOG (GNUNET_ERROR_TYPE_DEBUG,
2750 "Shutting down TCP plugin\n");
2752 /* Removing leftover sessions */
2753 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2754 &session_disconnect_it, plugin);
2755 /* Removing leftover NAT sessions */
2756 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
2757 &session_disconnect_it, plugin);
2759 next = ppc_dll_head;
2760 for (cur = next; NULL != cur; cur = next)
2763 GNUNET_CONTAINER_DLL_remove (ppc_dll_head, ppc_dll_tail, cur);
2764 if (NULL != cur->resolver_handle)
2765 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
2766 GNUNET_SCHEDULER_cancel (cur->timeout_task);
2771 if (plugin->service != NULL)
2772 GNUNET_SERVICE_stop (plugin->service);
2774 GNUNET_SERVER_destroy (plugin->server);
2775 GNUNET_free (plugin->handlers);
2776 if (plugin->nat != NULL)
2777 GNUNET_NAT_unregister (plugin->nat);
2778 while (NULL != (tcp_probe = plugin->probe_head))
2780 GNUNET_CONTAINER_DLL_remove (plugin->probe_head, plugin->probe_tail,
2782 GNUNET_CONNECTION_destroy (tcp_probe->sock);
2783 GNUNET_free (tcp_probe);
2785 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
2786 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
2787 GNUNET_free (plugin);
2792 /* end of plugin_transport_tcp.c */