2 This file is part of GNUnet
3 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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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_connection_lib.h"
28 #include "gnunet_container_lib.h"
29 #include "gnunet_os_lib.h"
30 #include "gnunet_protocols.h"
31 #include "gnunet_resolver_service.h"
32 #include "gnunet_server_lib.h"
33 #include "gnunet_service_lib.h"
34 #include "gnunet_signatures.h"
35 #include "gnunet_statistics_service.h"
36 #include "gnunet_transport_service.h"
37 #include "plugin_transport.h"
38 #include "transport.h"
40 #define DEBUG_TCP GNUNET_NO
41 #define DEBUG_TCP_NAT GNUNET_NO
42 #define MULTIPLE_PEER_SESSIONS GNUNET_YES
44 * How long until we give up on transmitting the welcome message?
46 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
50 * Initial handshake message for a session.
55 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
57 struct GNUNET_MessageHeader header;
60 * Identity of the node connecting (TCP client)
62 struct GNUNET_PeerIdentity clientIdentity;
67 * Basically a WELCOME message, but with the purpose
68 * of giving the waiting peer a client handle to use
70 struct TCP_NAT_ProbeMessage
73 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
75 struct GNUNET_MessageHeader header;
78 * Identity of the sender of the message.
80 struct GNUNET_PeerIdentity clientIdentity;
85 * Context for sending a NAT probe via TCP.
87 struct TCPProbeContext
92 struct GNUNET_CONNECTION_Handle *sock;
97 struct TCP_NAT_ProbeMessage message;
100 * Handle to the transmission.
102 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
105 * Transport plugin handle.
107 struct Plugin *plugin;
112 * Network format for IPv4 addresses.
114 struct IPv4TcpAddress
117 * IPv4 address, in network byte order.
119 uint32_t ipv4_addr GNUNET_PACKED;
122 * Port number, in network byte order.
124 uint16_t t_port GNUNET_PACKED;
130 * Network format for IPv6 addresses.
132 struct IPv6TcpAddress
137 struct in6_addr ipv6_addr GNUNET_PACKED;
140 * Port number, in network byte order.
142 uint16_t t6_port GNUNET_PACKED;
147 * Encapsulation of all of the state of the plugin.
153 * Local network addresses (actual IP address follows this struct).
154 * PORT is NOT included!
160 * This is a doubly linked list.
162 struct LocalAddrList *next;
165 * This is a doubly linked list.
167 struct LocalAddrList *prev;
170 * Number of bytes of the address that follow
178 * Information kept for each message that is yet to
181 struct PendingMessage
185 * This is a doubly-linked list.
187 struct PendingMessage *next;
190 * This is a doubly-linked list.
192 struct PendingMessage *prev;
195 * The pending message
200 * Continuation function to call once the message
201 * has been sent. Can be NULL if there is no
202 * continuation to call.
204 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
207 * Closure for transmit_cont.
209 void *transmit_cont_cls;
212 * Timeout value for the pending message.
214 struct GNUNET_TIME_Absolute timeout;
217 * So that the gnunet-service-transport can group messages together,
218 * these pending messages need to accept a message buffer and size
219 * instead of just a GNUNET_MessageHeader.
227 * Session handle for TCP connections.
235 struct SessionHeader header;
238 * Stored in a linked list.
240 struct Session *next;
243 * Pointer to the global plugin struct.
245 struct Plugin *plugin;
248 * The client (used to identify this connection)
250 struct GNUNET_SERVER_Client *client;
253 * Messages currently pending for transmission
254 * to this peer, if any.
256 struct PendingMessage *pending_messages_head;
259 * Messages currently pending for transmission
260 * to this peer, if any.
262 struct PendingMessage *pending_messages_tail;
265 * Handle for pending transmission request.
267 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
270 * To whom are we talking to (set to our identity
271 * if we are still waiting for the welcome message)
273 struct GNUNET_PeerIdentity target;
276 * ID of task used to delay receiving more to throttle sender.
278 GNUNET_SCHEDULER_TaskIdentifier receive_delay_task;
281 * Address of the other peer (either based on our 'connect'
282 * call or on our 'accept' call).
287 * Last activity on this connection. Used to select preferred
290 struct GNUNET_TIME_Absolute last_activity;
293 * Length of connect_addr.
298 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
300 int expecting_welcome;
303 * Was this a connection that was inbound (we accepted)? (GNUNET_YES/GNUNET_NO)
308 * Was this session created using NAT traversal?
316 * Encapsulation of all of the state of the plugin.
323 struct GNUNET_TRANSPORT_PluginEnvironment *env;
328 struct GNUNET_CONNECTION_Handle *lsock;
331 * stdout pipe handle for the gnunet-nat-server process
333 struct GNUNET_DISK_PipeHandle *server_stdout;
336 * stdout file handle (for reading) for the gnunet-nat-server process
338 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
341 * ID of select gnunet-nat-server stdout read task
343 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
346 * The process id of the server process (if behind NAT)
348 struct GNUNET_OS_Process *server_proc;
351 * List of open TCP sessions.
353 struct Session *sessions;
356 * Handle to the network service.
358 struct GNUNET_SERVICE_Context *service;
361 * Handle to the server for this service.
363 struct GNUNET_SERVER_Handle *server;
366 * Copy of the handler array where the closures are
367 * set to this struct's instance.
369 struct GNUNET_SERVER_MessageHandler *handlers;
372 * Handle for request of hostname resolution, non-NULL if pending.
374 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
377 * Map of peers we have tried to contact behind a NAT
379 struct GNUNET_CONTAINER_MultiHashMap *nat_wait_conns;
382 * The external address given to us by the user. Must be actual
383 * outside visible address for NAT punching to work.
385 char *external_address;
388 * The internal address given to us by the user (or discovered).
390 char *internal_address;
393 * Address given for us to bind to (ONLY).
398 * List of our IP addresses.
400 struct LocalAddrList *lal_head;
403 * Tail of our IP address list.
405 struct LocalAddrList *lal_tail;
408 * ID of task used to update our addresses when one expires.
410 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
413 * Port that we are actually listening on.
418 * Port that the user said we would have visible to the
424 * Is this transport configured to be behind a NAT?
429 * Is this transport configured to allow connections to NAT'd peers?
434 * Should this transport advertise only NAT addresses (port set to 0)?
435 * If not, all addresses will be duplicated for NAT punching and regular
438 int only_nat_addresses;
444 add_to_address_list (struct Plugin *plugin,
448 struct LocalAddrList *lal;
450 lal = plugin->lal_head;
453 if ( (lal->size == arg_size) &&
454 (0 == memcmp (&lal[1], arg, arg_size)) )
458 lal = GNUNET_malloc (sizeof (struct LocalAddrList) + arg_size);
459 lal->size = arg_size;
460 memcpy (&lal[1], arg, arg_size);
461 GNUNET_CONTAINER_DLL_insert (plugin->lal_head,
468 check_local_addr (struct Plugin *plugin,
472 struct LocalAddrList *lal;
474 lal = plugin->lal_head;
477 if ( (lal->size == arg_size) &&
478 (0 == memcmp (&lal[1], arg, arg_size)) )
482 return GNUNET_SYSERR;
487 * Function called for a quick conversion of the binary address to
488 * a numeric address. Note that the caller must not free the
489 * address and that the next call to this function is allowed
490 * to override the address again.
492 * @param cls closure ('struct Plugin*')
493 * @param addr binary address
494 * @param addrlen length of the address
495 * @return string representing the same address
498 tcp_address_to_string (void *cls,
502 static char rbuf[INET6_ADDRSTRLEN + 12];
503 char buf[INET6_ADDRSTRLEN];
507 const struct IPv4TcpAddress *t4;
508 const struct IPv6TcpAddress *t6;
512 if (addrlen == sizeof (struct IPv6TcpAddress))
516 port = ntohs (t6->t6_port);
517 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
520 else if (addrlen == sizeof (struct IPv4TcpAddress))
524 port = ntohs (t4->t_port);
525 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
530 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
531 _("Unexpected address length: %u\n"),
536 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
538 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
541 GNUNET_snprintf (rbuf,
543 (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
551 * Find the session handle for the given client.
553 * @return NULL if no matching session exists
555 static struct Session *
556 find_session_by_client (struct Plugin *plugin,
557 const struct GNUNET_SERVER_Client *client)
561 ret = plugin->sessions;
562 while ((ret != NULL) && (client != ret->client))
567 #if !MULTIPLE_PEER_SESSIONS
569 * Find the session handle for the given client.
571 * @return NULL if no matching session exists
573 static struct Session *
574 find_session_by_id (struct Plugin *plugin,
575 const struct GNUNET_PeerIdentity *peer)
579 ret = plugin->sessions;
580 while ((ret != NULL) && (0 != memcmp(peer, &ret->target, sizeof(struct GNUNET_PeerIdentity))))
587 * Create a new session. Also queues a welcome message.
590 * @param target peer to connect to
591 * @param client client to use
592 * @param is_nat this a NAT session, we should wait for a client to
593 * connect to us from an address, then assign that to
595 * @return new session object
597 static struct Session *
598 create_session (struct Plugin *plugin,
599 const struct GNUNET_PeerIdentity *target,
600 struct GNUNET_SERVER_Client *client, int is_nat)
603 struct PendingMessage *pm;
604 struct WelcomeMessage welcome;
606 if (is_nat != GNUNET_YES)
607 GNUNET_assert (client != NULL);
609 GNUNET_assert (client == NULL);
612 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
613 "Creating new session for peer `%4s'\n",
614 GNUNET_i2s (target));
616 ret = GNUNET_malloc (sizeof (struct Session));
617 ret->last_activity = GNUNET_TIME_absolute_get ();
618 ret->plugin = plugin;
619 ret->is_nat = is_nat;
620 if (is_nat != GNUNET_YES) /* If not a NAT WAIT conn, add it to global list */
622 ret->next = plugin->sessions;
623 plugin->sessions = ret;
625 ret->client = client;
626 ret->target = *target;
627 ret->expecting_welcome = GNUNET_YES;
628 pm = GNUNET_malloc (sizeof (struct PendingMessage) + sizeof (struct WelcomeMessage));
629 pm->msg = (const char*) &pm[1];
630 pm->message_size = sizeof (struct WelcomeMessage);
631 welcome.header.size = htons (sizeof (struct WelcomeMessage));
632 welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
633 welcome.clientIdentity = *plugin->env->my_identity;
634 memcpy (&pm[1], &welcome, sizeof (welcome));
635 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
636 GNUNET_STATISTICS_update (plugin->env->stats,
637 gettext_noop ("# bytes currently in TCP buffers"),
640 GNUNET_CONTAINER_DLL_insert (ret->pending_messages_head,
641 ret->pending_messages_tail,
643 if (is_nat != GNUNET_YES)
644 GNUNET_STATISTICS_update (plugin->env->stats,
645 gettext_noop ("# TCP sessions active"),
653 * If we have pending messages, ask the server to
654 * transmit them (schedule the respective tasks, etc.)
656 * @param session for which session should we do this
658 static void process_pending_messages (struct Session *session);
662 * Function called to notify a client about the socket
663 * being ready to queue more data. "buf" will be
664 * NULL and "size" zero if the socket was closed for
665 * writing in the meantime.
668 * @param size number of bytes available in buf
669 * @param buf where the callee should write the message
670 * @return number of bytes written to buf
673 do_transmit (void *cls, size_t size, void *buf)
675 struct Session *session = cls;
676 struct GNUNET_PeerIdentity pid;
677 struct Plugin *plugin;
678 struct PendingMessage *pos;
679 struct PendingMessage *hd;
680 struct PendingMessage *tl;
681 struct GNUNET_TIME_Absolute now;
685 session->transmit_handle = NULL;
686 plugin = session->plugin;
690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
691 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
692 GNUNET_i2s (&session->target));
694 /* timeout; cancel all messages that have already expired */
698 now = GNUNET_TIME_absolute_get ();
699 while ( (NULL != (pos = session->pending_messages_head)) &&
700 (pos->timeout.abs_value <= now.abs_value) )
702 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
703 session->pending_messages_tail,
706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
707 "Failed to transmit %u byte message to `%4s'.\n",
709 GNUNET_i2s (&session->target));
711 ret += pos->message_size;
712 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
714 /* do this call before callbacks (so that if callbacks destroy
715 session, they have a chance to cancel actions done by this
717 process_pending_messages (session);
718 pid = session->target;
719 /* no do callbacks and do not use session again since
720 the callbacks may abort the session */
721 while (NULL != (pos = hd))
723 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
724 if (pos->transmit_cont != NULL)
725 pos->transmit_cont (pos->transmit_cont_cls,
726 &pid, GNUNET_SYSERR);
729 GNUNET_STATISTICS_update (plugin->env->stats,
730 gettext_noop ("# bytes currently in TCP buffers"),
733 GNUNET_STATISTICS_update (plugin->env->stats,
734 gettext_noop ("# bytes discarded by TCP (timeout)"),
739 /* copy all pending messages that would fit */
744 while (NULL != (pos = session->pending_messages_head))
746 if (ret + pos->message_size > size)
748 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
749 session->pending_messages_tail,
751 GNUNET_assert (size >= pos->message_size);
752 /* FIXME: this memcpy can be up to 7% of our total runtime */
753 memcpy (cbuf, pos->msg, pos->message_size);
754 cbuf += pos->message_size;
755 ret += pos->message_size;
756 size -= pos->message_size;
757 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
759 /* schedule 'continuation' before callbacks so that callbacks that
760 cancel everything don't cause us to use a session that no longer
762 process_pending_messages (session);
763 session->last_activity = GNUNET_TIME_absolute_get ();
764 pid = session->target;
765 /* we'll now call callbacks that may cancel the session; hence
766 we should not use 'session' after this point */
767 while (NULL != (pos = hd))
769 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
770 if (pos->transmit_cont != NULL)
771 pos->transmit_cont (pos->transmit_cont_cls,
775 GNUNET_assert (hd == NULL);
776 GNUNET_assert (tl == NULL);
778 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
779 "Transmitting %u bytes\n", ret);
781 GNUNET_STATISTICS_update (plugin->env->stats,
782 gettext_noop ("# bytes currently in TCP buffers"),
785 GNUNET_STATISTICS_update (plugin->env->stats,
786 gettext_noop ("# bytes transmitted via TCP"),
794 * If we have pending messages, ask the server to
795 * transmit them (schedule the respective tasks, etc.)
797 * @param session for which session should we do this
800 process_pending_messages (struct Session *session)
802 struct PendingMessage *pm;
804 GNUNET_assert (session->client != NULL);
805 if (session->transmit_handle != NULL)
807 if (NULL == (pm = session->pending_messages_head))
810 session->transmit_handle
811 = GNUNET_SERVER_notify_transmit_ready (session->client,
813 GNUNET_TIME_absolute_get_remaining
815 &do_transmit, session);
820 * Functions with this signature are called whenever we need
821 * to close a session due to a disconnect or failure to
822 * establish a connection.
824 * @param session session to close down
827 disconnect_session (struct Session *session)
829 struct Session *prev;
831 struct PendingMessage *pm;
834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
835 "Disconnecting from `%4s' at %s (session %p).\n",
836 GNUNET_i2s (&session->target),
837 (session->connect_addr != NULL) ?
838 tcp_address_to_string (session->plugin,
839 session->connect_addr,
840 session->connect_alen) : "*",
843 /* remove from session list */
845 pos = session->plugin->sessions;
846 while (pos != session)
852 session->plugin->sessions = session->next;
854 prev->next = session->next;
855 session->plugin->env->session_end (session->plugin->env->cls,
859 if (session->transmit_handle != NULL)
861 GNUNET_CONNECTION_notify_transmit_ready_cancel
862 (session->transmit_handle);
863 session->transmit_handle = NULL;
865 while (NULL != (pm = session->pending_messages_head))
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
870 pm->transmit_cont != NULL
871 ? "Could not deliver message to `%4s'.\n"
873 "Could not deliver message to `%4s', notifying.\n",
874 GNUNET_i2s (&session->target));
876 GNUNET_STATISTICS_update (session->plugin->env->stats,
877 gettext_noop ("# bytes currently in TCP buffers"),
878 - (int64_t) pm->message_size,
880 GNUNET_STATISTICS_update (session->plugin->env->stats,
881 gettext_noop ("# bytes discarded by TCP (disconnect)"),
884 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
885 session->pending_messages_tail,
887 if (NULL != pm->transmit_cont)
888 pm->transmit_cont (pm->transmit_cont_cls,
889 &session->target, GNUNET_SYSERR);
892 GNUNET_break (session->client != NULL);
893 if (session->receive_delay_task != GNUNET_SCHEDULER_NO_TASK)
895 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
896 if (session->client != NULL)
897 GNUNET_SERVER_receive_done (session->client,
900 if (session->client != NULL)
901 GNUNET_SERVER_client_drop (session->client);
902 GNUNET_STATISTICS_update (session->plugin->env->stats,
903 gettext_noop ("# TCP sessions active"),
906 GNUNET_free_non_null (session->connect_addr);
907 GNUNET_free (session);
912 * Given two otherwise equivalent sessions, pick the better one.
914 * @param s1 one session (also default)
915 * @param s2 other session
916 * @return "better" session (more active)
918 static struct Session *
919 select_better_session (struct Session *s1,
926 if ( (s1->expecting_welcome == GNUNET_NO) &&
927 (s2->expecting_welcome == GNUNET_YES) )
929 if ( (s1->expecting_welcome == GNUNET_YES) &&
930 (s2->expecting_welcome == GNUNET_NO) )
932 if (s1->last_activity.abs_value < s2->last_activity.abs_value)
934 if (s1->last_activity.abs_value > s2->last_activity.abs_value)
936 if ( (GNUNET_YES == s1->inbound) &&
937 (GNUNET_NO == s2->inbound) )
939 if ( (GNUNET_NO == s1->inbound) &&
940 (GNUNET_YES == s2->inbound) )
947 * We learned about a peer (possibly behind NAT) so run the
948 * gnunet-nat-client to send dummy ICMP responses
950 * @param plugin the plugin for this transport
951 * @param addr the address of the peer
952 * @param addrlen the length of the address
955 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
957 char inet4[INET_ADDRSTRLEN];
958 char *address_as_string;
959 char *port_as_string;
960 struct GNUNET_OS_Process *proc;
961 const struct sockaddr *sa = (const struct sockaddr *)addr;
964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
965 _("called run_gnunet_nat_client addrlen %d others are %d and %d\n"), addrlen, sizeof (struct sockaddr), sizeof (struct sockaddr_in));
968 if (addrlen < sizeof (struct sockaddr))
971 switch (sa->sa_family)
974 if (addrlen != sizeof (struct sockaddr_in))
976 if (NULL == inet_ntop (AF_INET,
977 &((struct sockaddr_in *) sa)->sin_addr,
978 inet4, INET_ADDRSTRLEN))
980 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
983 address_as_string = GNUNET_strdup (inet4);
990 GNUNET_asprintf(&port_as_string, "%d", plugin->adv_port);
992 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
993 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->adv_port);
996 /* Start the client process */
997 proc = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
998 GNUNET_free(address_as_string);
999 GNUNET_free(port_as_string);
1000 GNUNET_OS_process_wait (proc);
1001 GNUNET_OS_process_close (proc);
1007 * Function that can be used by the transport service to transmit
1008 * a message using the plugin. Note that in the case of a
1009 * peer disconnecting, the continuation MUST be called
1010 * prior to the disconnect notification itself. This function
1011 * will be called with this peer's HELLO message to initiate
1012 * a fresh connection to another peer.
1014 * @param cls closure
1015 * @param target who should receive this message
1016 * @param msg the message to transmit
1017 * @param msgbuf_size number of bytes in 'msg'
1018 * @param priority how important is the message (most plugins will
1019 * ignore message priority and just FIFO)
1020 * @param timeout how long to wait at most for the transmission (does not
1021 * require plugins to discard the message after the timeout,
1022 * just advisory for the desired delay; most plugins will ignore
1024 * @param session which session must be used (or NULL for "any")
1025 * @param addr the address to use (can be NULL if the plugin
1026 * is "on its own" (i.e. re-use existing TCP connection))
1027 * @param addrlen length of the address in bytes
1028 * @param force_address GNUNET_YES if the plugin MUST use the given address,
1029 * GNUNET_NO means the plugin may use any other address and
1030 * GNUNET_SYSERR means that only reliable existing
1031 * bi-directional connections should be used (regardless
1033 * @param cont continuation to call once the message has
1034 * been transmitted (or if the transport is ready
1035 * for the next transmission call; or if the
1036 * peer disconnected...); can be NULL
1037 * @param cont_cls closure for cont
1038 * @return number of bytes used (on the physical network, with overheads);
1039 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1040 * and does NOT mean that the message was not transmitted (DV and NAT)
1043 tcp_plugin_send (void *cls,
1044 const struct GNUNET_PeerIdentity *target,
1048 struct GNUNET_TIME_Relative timeout,
1049 struct Session *session,
1053 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1055 struct Plugin *plugin = cls;
1056 struct Session *cand_session;
1057 struct Session *next;
1058 struct PendingMessage *pm;
1059 struct GNUNET_CONNECTION_Handle *sa;
1063 struct sockaddr_in a4;
1064 struct sockaddr_in6 a6;
1065 const struct IPv4TcpAddress *t4;
1066 const struct IPv6TcpAddress *t6;
1067 unsigned int is_natd;
1069 GNUNET_STATISTICS_update (plugin->env->stats,
1070 gettext_noop ("# bytes TCP was asked to transmit"),
1073 /* FIXME: we could do this cheaper with a hash table
1074 where we could restrict the iteration to entries that match
1075 the target peer... */
1076 is_natd = GNUNET_NO;
1077 if (session == NULL)
1079 cand_session = NULL;
1080 next = plugin->sessions;
1081 while (NULL != (session = next))
1083 next = session->next;
1084 GNUNET_assert (session->client != NULL);
1085 if (0 != memcmp (target,
1087 sizeof (struct GNUNET_PeerIdentity)))
1089 if ( ( (GNUNET_SYSERR == force_address) &&
1090 (session->expecting_welcome == GNUNET_NO) ) ||
1091 (GNUNET_NO == force_address) )
1093 cand_session = select_better_session (cand_session,
1097 if (GNUNET_SYSERR == force_address)
1099 GNUNET_break (GNUNET_YES == force_address);
1106 if (session->inbound == GNUNET_YES) /* FIXME: why do we ignore inbound sessions? */
1108 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Ignoring inbound session\n");
1112 if ((addrlen != session->connect_alen) && (session->is_nat == GNUNET_NO))
1114 if ((0 != memcmp (session->connect_addr,
1116 addrlen)) && (session->is_nat == GNUNET_NO))
1118 cand_session = select_better_session (cand_session,
1121 session = cand_session;
1123 if ( (session == NULL) &&
1127 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1128 "Asked to transmit to `%4s' without address and I have no existing connection (failing).\n",
1129 GNUNET_i2s (target));
1131 GNUNET_STATISTICS_update (plugin->env->stats,
1132 gettext_noop ("# bytes discarded by TCP (no address and no connection)"),
1137 if (session == NULL)
1139 if (addrlen == sizeof (struct IPv6TcpAddress))
1143 memset (&a6, 0, sizeof (a6));
1144 #if HAVE_SOCKADDR_IN_SIN_LEN
1145 a6.sin6_len = sizeof (a6);
1147 a6.sin6_family = AF_INET6;
1148 a6.sin6_port = t6->t6_port;
1149 if (t6->t6_port == 0)
1150 is_natd = GNUNET_YES;
1151 memcpy (&a6.sin6_addr,
1153 sizeof (struct in6_addr));
1157 else if (addrlen == sizeof (struct IPv4TcpAddress))
1161 memset (&a4, 0, sizeof (a4));
1162 #if HAVE_SOCKADDR_IN_SIN_LEN
1163 a4.sin_len = sizeof (a4);
1165 a4.sin_family = AF_INET;
1166 a4.sin_port = t4->t_port;
1167 if (t4->t_port == 0)
1168 is_natd = GNUNET_YES;
1169 a4.sin_addr.s_addr = t4->ipv4_addr;
1175 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1176 _("Address of unexpected length: %u\n"),
1182 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1183 return -1; /* NAT client only works with IPv4 addresses */
1186 if ((plugin->allow_nat == GNUNET_YES) && (is_natd == GNUNET_YES) &&
1187 (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns, &target->hashPubKey)))
1190 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1191 _("Found valid IPv4 NAT address (creating session)!\n"));
1193 session = create_session (plugin,
1197 /* create new message entry */
1198 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1199 /* FIXME: the memset of this malloc can be up to 2% of our total runtime */
1200 pm->msg = (const char*) &pm[1];
1201 memcpy (&pm[1], msg, msgbuf_size);
1202 /* FIXME: this memcpy can be up to 7% of our total run-time
1203 (for transport service) */
1204 pm->message_size = msgbuf_size;
1205 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1206 pm->transmit_cont = cont;
1207 pm->transmit_cont_cls = cont_cls;
1209 /* append pm to pending_messages list */
1210 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1211 session->pending_messages_tail,
1212 session->pending_messages_tail,
1215 GNUNET_assert(GNUNET_CONTAINER_multihashmap_put(plugin->nat_wait_conns, &target->hashPubKey, session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY) == GNUNET_OK);
1217 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1218 "Created NAT WAIT connection to `%4s' at `%s'\n",
1219 GNUNET_i2s (target),
1220 GNUNET_a2s (sb, sbs));
1222 run_gnunet_nat_client (plugin, sb, sbs);
1225 else if ((plugin->allow_nat == GNUNET_YES) && (is_natd == GNUNET_YES) && (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns, &target->hashPubKey)))
1227 /* Only do one NAT punch attempt per peer identity */
1230 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1235 "Failed to create connection to `%4s' at `%s'\n",
1236 GNUNET_i2s (target),
1237 GNUNET_a2s (sb, sbs));
1239 GNUNET_STATISTICS_update (plugin->env->stats,
1240 gettext_noop ("# bytes discarded by TCP (failed to connect)"),
1246 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1247 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1248 GNUNET_i2s (target),
1249 GNUNET_a2s (sb, sbs));
1251 session = create_session (plugin,
1253 GNUNET_SERVER_connect_socket (plugin->server,
1255 session->connect_addr = GNUNET_malloc (addrlen);
1256 memcpy (session->connect_addr,
1259 session->connect_alen = addrlen;
1261 GNUNET_assert (session != NULL);
1262 GNUNET_assert (session->client != NULL);
1263 GNUNET_STATISTICS_update (plugin->env->stats,
1264 gettext_noop ("# bytes currently in TCP buffers"),
1267 /* create new message entry */
1268 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1269 pm->msg = (const char*) &pm[1];
1270 memcpy (&pm[1], msg, msgbuf_size);
1271 pm->message_size = msgbuf_size;
1272 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1273 pm->transmit_cont = cont;
1274 pm->transmit_cont_cls = cont_cls;
1276 /* append pm to pending_messages list */
1277 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1278 session->pending_messages_tail,
1279 session->pending_messages_tail,
1282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1283 "Asked to transmit %u bytes to `%s', added message to list.\n",
1285 GNUNET_i2s (target));
1287 process_pending_messages (session);
1293 * Function that can be called to force a disconnect from the
1294 * specified neighbour. This should also cancel all previously
1295 * scheduled transmissions. Obviously the transmission may have been
1296 * partially completed already, which is OK. The plugin is supposed
1297 * to close the connection (if applicable) and no longer call the
1298 * transmit continuation(s).
1300 * Finally, plugin MUST NOT call the services's receive function to
1301 * notify the service that the connection to the specified target was
1302 * closed after a getting this call.
1304 * @param cls closure
1305 * @param target peer for which the last transmission is
1309 tcp_plugin_disconnect (void *cls,
1310 const struct GNUNET_PeerIdentity *target)
1312 struct Plugin *plugin = cls;
1313 struct Session *session;
1314 struct Session *next;
1315 struct PendingMessage *pm;
1318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1319 "Asked to cancel session with `%4s'\n",
1320 GNUNET_i2s (target));
1322 next = plugin->sessions;
1323 while (NULL != (session = next))
1325 next = session->next;
1326 if (0 != memcmp (target,
1328 sizeof (struct GNUNET_PeerIdentity)))
1330 pm = session->pending_messages_head;
1333 pm->transmit_cont = NULL;
1334 pm->transmit_cont_cls = NULL;
1337 disconnect_session (session);
1343 * Context for address to string conversion.
1345 struct PrettyPrinterContext
1348 * Function to call with the result.
1350 GNUNET_TRANSPORT_AddressStringCallback asc;
1353 * Clsoure for 'asc'.
1358 * Port to add after the IP address.
1365 * Append our port and forward the result.
1367 * @param cls the 'struct PrettyPrinterContext*'
1368 * @param hostname hostname part of the address
1371 append_port (void *cls, const char *hostname)
1373 struct PrettyPrinterContext *ppc = cls;
1376 if (hostname == NULL)
1378 ppc->asc (ppc->asc_cls, NULL);
1382 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1383 ppc->asc (ppc->asc_cls, ret);
1389 * Convert the transports address to a nice, human-readable
1392 * @param cls closure
1393 * @param type name of the transport that generated the address
1394 * @param addr one of the addresses of the host, NULL for the last address
1395 * the specific address format depends on the transport
1396 * @param addrlen length of the address
1397 * @param numeric should (IP) addresses be displayed in numeric form?
1398 * @param timeout after how long should we give up?
1399 * @param asc function to call on each string
1400 * @param asc_cls closure for asc
1403 tcp_plugin_address_pretty_printer (void *cls,
1408 struct GNUNET_TIME_Relative timeout,
1409 GNUNET_TRANSPORT_AddressStringCallback asc,
1412 struct Plugin *plugin = cls;
1413 struct PrettyPrinterContext *ppc;
1416 struct sockaddr_in a4;
1417 struct sockaddr_in6 a6;
1418 const struct IPv4TcpAddress *t4;
1419 const struct IPv6TcpAddress *t6;
1422 if (addrlen == sizeof (struct IPv6TcpAddress))
1425 memset (&a6, 0, sizeof (a6));
1426 a6.sin6_family = AF_INET6;
1427 a6.sin6_port = t6->t6_port;
1428 memcpy (&a6.sin6_addr,
1430 sizeof (struct in6_addr));
1431 port = ntohs (t6->t6_port);
1435 else if (addrlen == sizeof (struct IPv4TcpAddress))
1438 memset (&a4, 0, sizeof (a4));
1439 a4.sin_family = AF_INET;
1440 a4.sin_port = t4->t_port;
1441 a4.sin_addr.s_addr = t4->ipv4_addr;
1442 port = ntohs (t4->t_port);
1448 /* invalid address */
1449 GNUNET_break_op (0);
1450 asc (asc_cls, NULL);
1453 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1455 ppc->asc_cls = asc_cls;
1457 GNUNET_RESOLVER_hostname_get (plugin->env->cfg,
1460 !numeric, timeout, &append_port, ppc);
1465 * Check if the given port is plausible (must be either
1466 * our listen port or our advertised port). If it is
1467 * neither, we return GNUNET_SYSERR.
1469 * @param plugin global variables
1470 * @param in_port port number to check
1471 * @return GNUNET_OK if port is either open_port or adv_port
1474 check_port (struct Plugin *plugin, uint16_t in_port)
1476 if ( (plugin->behind_nat == GNUNET_YES) && (in_port == 0) )
1478 if ( (plugin->only_nat_addresses == GNUNET_YES) &&
1479 (plugin->behind_nat == GNUNET_YES) )
1481 return GNUNET_SYSERR; /* odd case... */
1483 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1485 return GNUNET_SYSERR;
1490 * Function that will be called to check if a binary address for this
1491 * plugin is well-formed and corresponds to an address for THIS peer
1492 * (as per our configuration). Naturally, if absolutely necessary,
1493 * plugins can be a bit conservative in their answer, but in general
1494 * plugins should make sure that the address does not redirect
1495 * traffic to a 3rd party that might try to man-in-the-middle our
1498 * @param cls closure, our 'struct Plugin*'
1499 * @param addr pointer to the address
1500 * @param addrlen length of addr
1501 * @return GNUNET_OK if this is a plausible address for this peer
1502 * and transport, GNUNET_SYSERR if not
1505 tcp_plugin_check_address (void *cls,
1509 struct Plugin *plugin = cls;
1510 struct IPv4TcpAddress *v4;
1511 struct IPv6TcpAddress *v6;
1513 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1514 (addrlen != sizeof (struct IPv6TcpAddress)))
1516 GNUNET_break_op (0);
1517 return GNUNET_SYSERR;
1519 if (addrlen == sizeof (struct IPv4TcpAddress))
1521 v4 = (struct IPv4TcpAddress *) addr;
1523 check_port (plugin, ntohs (v4->t_port)))
1524 return GNUNET_SYSERR;
1526 check_local_addr (plugin, &v4->ipv4_addr, sizeof (uint32_t)))
1528 return GNUNET_SYSERR;
1533 v6 = (struct IPv6TcpAddress *) addr;
1534 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1536 GNUNET_break_op (0);
1537 return GNUNET_SYSERR;
1540 check_port (plugin, ntohs (v6->t6_port)))
1541 return GNUNET_SYSERR;
1543 check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
1545 return GNUNET_SYSERR;
1552 * We've received a nat probe from this peer via TCP. Finish
1553 * creating the client session and resume sending of queued
1556 * @param cls closure
1557 * @param client identification of the client
1558 * @param message the actual message
1561 handle_tcp_nat_probe (void *cls,
1562 struct GNUNET_SERVER_Client *client,
1563 const struct GNUNET_MessageHeader *message)
1565 struct Plugin *plugin = cls;
1566 struct Session *session;
1567 struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1570 struct IPv4TcpAddress *t4;
1571 struct IPv6TcpAddress *t6;
1572 const struct sockaddr_in *s4;
1573 const struct sockaddr_in6 *s6;
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "received tcp NAT probe\n");
1578 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1579 * a connection to this peer by running gnunet-nat-client. This peer
1580 * received the punch message and now wants us to use the new connection
1581 * as the default for that peer. Do so and then send a WELCOME message
1582 * so we can really be connected!
1584 if (ntohs(message->size) != sizeof(struct TCP_NAT_ProbeMessage))
1587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Bad size for tcp NAT probe, expected %d got %d.\n", sizeof(struct TCP_NAT_ProbeMessage), ntohs(message->size));
1592 tcp_nat_probe = (struct TCP_NAT_ProbeMessage *)message;
1594 if (GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity.hashPubKey) == GNUNET_YES)
1597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found session for NAT probe!\n");
1599 session = GNUNET_CONTAINER_multihashmap_get(plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity.hashPubKey);
1600 GNUNET_assert(session != NULL);
1601 GNUNET_assert(GNUNET_CONTAINER_multihashmap_remove(plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity.hashPubKey, session) == GNUNET_YES);
1602 GNUNET_SERVER_client_keep (client);
1603 session->client = client;
1604 session->last_activity = GNUNET_TIME_absolute_get ();
1605 session->inbound = GNUNET_NO;
1608 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1611 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1612 "handle_tcp_nat_probe Found address `%s' for incoming connection %p\n",
1613 GNUNET_a2s (vaddr, alen),
1616 if (((const struct sockaddr *)vaddr)->sa_family == AF_INET)
1619 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1620 t4->t_port = s4->sin_port;
1621 t4->ipv4_addr = s4->sin_addr.s_addr;
1622 session->connect_addr = t4;
1623 session->connect_alen = sizeof (struct IPv4TcpAddress);
1625 else if (((const struct sockaddr *)vaddr)->sa_family == AF_INET6)
1628 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1629 t6->t6_port = s6->sin6_port;
1630 memcpy (&t6->ipv6_addr,
1632 sizeof (struct in6_addr));
1633 session->connect_addr = t6;
1634 session->connect_alen = sizeof (struct IPv6TcpAddress);
1639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1640 "Bad address for incoming connection!\n");
1643 GNUNET_free (vaddr);
1646 session->next = plugin->sessions;
1647 plugin->sessions = session;
1648 GNUNET_STATISTICS_update (plugin->env->stats,
1649 gettext_noop ("# TCP sessions active"),
1652 process_pending_messages (session);
1657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Did NOT find session for NAT probe!\n");
1661 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1665 * We've received a welcome from this peer via TCP. Possibly create a
1666 * fresh client record and send back our welcome.
1668 * @param cls closure
1669 * @param client identification of the client
1670 * @param message the actual message
1673 handle_tcp_welcome (void *cls,
1674 struct GNUNET_SERVER_Client *client,
1675 const struct GNUNET_MessageHeader *message)
1677 struct Plugin *plugin = cls;
1678 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
1679 struct Session *session;
1682 struct IPv4TcpAddress *t4;
1683 struct IPv6TcpAddress *t6;
1684 const struct sockaddr_in *s4;
1685 const struct sockaddr_in6 *s6;
1688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1689 "Received %s message from a `%4s/%p'.\n",
1691 GNUNET_i2s (&wm->clientIdentity), client);
1693 GNUNET_STATISTICS_update (plugin->env->stats,
1694 gettext_noop ("# TCP WELCOME messages received"),
1697 #if MULTIPLE_PEER_SESSIONS
1698 session = find_session_by_client (plugin, client);
1700 session = find_session_by_id(plugin, &wm->clientIdentity);
1703 if (session == NULL)
1705 GNUNET_SERVER_client_keep (client);
1707 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1708 "Received %s message from a `%4s/%p', creating session\n",
1710 GNUNET_i2s (&wm->clientIdentity), client);
1712 session = create_session (plugin,
1713 &wm->clientIdentity, client, GNUNET_NO);
1714 session->inbound = GNUNET_YES;
1716 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1719 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1720 "Found address `%s' for incoming connection %p\n",
1721 GNUNET_a2s (vaddr, alen),
1724 if (alen == sizeof (struct sockaddr_in))
1727 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1728 t4->t_port = s4->sin_port;
1729 t4->ipv4_addr = s4->sin_addr.s_addr;
1730 session->connect_addr = t4;
1731 session->connect_alen = sizeof (struct IPv4TcpAddress);
1733 else if (alen == sizeof (struct sockaddr_in6))
1736 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1737 t6->t6_port = s6->sin6_port;
1738 memcpy (&t6->ipv6_addr,
1740 sizeof (struct in6_addr));
1741 session->connect_addr = t6;
1742 session->connect_alen = sizeof (struct IPv6TcpAddress);
1745 GNUNET_free (vaddr);
1750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1751 "Did not obtain TCP socket address for incoming connection\n");
1755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1756 "Creating new session %p for connection %p\n",
1759 process_pending_messages (session);
1765 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1767 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1768 "Found address `%s' (already have session) for incoming connection %p\n",
1769 GNUNET_a2s (vaddr, alen),
1775 #if MULTIPLE_PEER_SESSIONS
1776 if (session->expecting_welcome != GNUNET_YES)
1778 GNUNET_break_op (0);
1779 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1783 session->last_activity = GNUNET_TIME_absolute_get ();
1784 session->expecting_welcome = GNUNET_NO;
1785 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1790 * Task to signal the server that we can continue
1791 * receiving from the TCP client now.
1793 * @param cls the 'struct Session*'
1794 * @param tc task context (unused)
1797 delayed_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1799 struct Session *session = cls;
1800 struct GNUNET_TIME_Relative delay;
1802 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
1803 delay = session->plugin->env->receive (session->plugin->env->cls,
1808 if (delay.rel_value == 0)
1809 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
1811 session->receive_delay_task =
1812 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
1817 * We've received data for this peer via TCP. Unbox,
1818 * compute latency and forward.
1820 * @param cls closure
1821 * @param client identification of the client
1822 * @param message the actual message
1825 handle_tcp_data (void *cls,
1826 struct GNUNET_SERVER_Client *client,
1827 const struct GNUNET_MessageHeader *message)
1829 struct Plugin *plugin = cls;
1830 struct Session *session;
1831 struct GNUNET_TIME_Relative delay;
1833 if ((GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == ntohs(message->type)) || (ntohs(message->type) == GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE))
1835 /* We don't want to propagate WELCOME and NAT Probe messages up! */
1836 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1839 session = find_session_by_client (plugin, client);
1840 if ( (NULL == session) || (GNUNET_YES == session->expecting_welcome))
1842 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1845 session->last_activity = GNUNET_TIME_absolute_get ();
1847 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1848 "Passing %u bytes of type %u from `%4s' to transport service.\n",
1849 (unsigned int) ntohs (message->size),
1850 (unsigned int) ntohs (message->type),
1851 GNUNET_i2s (&session->target));
1853 GNUNET_STATISTICS_update (plugin->env->stats,
1854 gettext_noop ("# bytes received via TCP"),
1855 ntohs (message->size),
1857 delay = plugin->env->receive (plugin->env->cls, &session->target, message, 1,
1859 (GNUNET_YES == session->inbound) ? NULL : session->connect_addr,
1860 (GNUNET_YES == session->inbound) ? 0 : session->connect_alen);
1861 if (delay.rel_value == 0)
1862 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1864 session->receive_delay_task =
1865 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
1870 * Functions with this signature are called whenever a peer
1871 * is disconnected on the network level.
1873 * @param cls closure
1874 * @param client identification of the client
1877 disconnect_notify (void *cls,
1878 struct GNUNET_SERVER_Client *client)
1880 struct Plugin *plugin = cls;
1881 struct Session *session;
1885 session = find_session_by_client (plugin, client);
1886 if (session == NULL)
1887 return; /* unknown, nothing to do */
1889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1890 "Destroying session of `%4s' with %s (%p) due to network-level disconnect.\n",
1891 GNUNET_i2s (&session->target),
1892 (session->connect_addr != NULL) ?
1893 tcp_address_to_string (session->plugin,
1894 session->connect_addr,
1895 session->connect_alen) : "*",
1898 disconnect_session (session);
1903 * Add the IP of our network interface to the list of
1904 * our external IP addresses.
1906 * @param cls the 'struct Plugin*'
1907 * @param name name of the interface
1908 * @param isDefault do we think this may be our default interface
1909 * @param addr address of the interface
1910 * @param addrlen number of bytes in addr
1911 * @return GNUNET_OK to continue iterating
1914 process_interfaces (void *cls,
1917 const struct sockaddr *addr, socklen_t addrlen)
1919 struct Plugin *plugin = cls;
1921 struct IPv4TcpAddress t4;
1922 struct IPv6TcpAddress t6;
1923 struct IPv4TcpAddress t4_nat;
1924 struct IPv6TcpAddress t6_nat;
1928 char buf[INET_ADDRSTRLEN];
1930 af = addr->sa_family;
1934 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1935 GNUNET_assert(NULL != inet_ntop(AF_INET, &t4.ipv4_addr, &buf[0], INET_ADDRSTRLEN));
1936 if ((plugin->bind_address != NULL) && (0 != strcmp(buf, plugin->bind_address)))
1938 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Not notifying transport of address %s\n", "TCP", GNUNET_a2s (addr, addrlen));
1941 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
1942 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
1943 t4.t_port = htons(0);
1944 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
1946 t4_nat.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1947 t4_nat.t_port = htons(plugin->adv_port);
1951 t4.t_port = htons (plugin->adv_port);
1955 else if (af == AF_INET6)
1957 if ((IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr)) || (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(plugin->env->cfg, "transport-tcp", "disablev6")))
1959 /* skip link local addresses */
1962 memcpy (&t6.ipv6_addr,
1963 &((struct sockaddr_in6 *) addr)->sin6_addr,
1964 sizeof (struct in6_addr));
1965 add_to_address_list (plugin, &t6.ipv6_addr, sizeof (struct in6_addr));
1966 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
1967 t6.t6_port = htons(0);
1968 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
1970 memcpy (&t6_nat.ipv6_addr,
1971 &((struct sockaddr_in6 *) addr)->sin6_addr,
1972 sizeof (struct in6_addr));
1973 t6_nat.t6_port = htons(plugin->adv_port);
1977 t6.t6_port = htons (plugin->adv_port);
1986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1987 _("Found address `%s' (%s) len %d\n"),
1988 GNUNET_a2s (addr, addrlen), name, args);
1990 plugin->env->notify_address (plugin->env->cls,
1992 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
1994 if (arg_nat != NULL)
1996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1997 _("Found address `%s' (%s) len %d\n"),
1998 GNUNET_a2s (addr, addrlen), name, args);
1999 plugin->env->notify_address (plugin->env->cls,
2001 arg_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
2009 * Function called by the resolver for each address obtained from DNS
2010 * for our own hostname. Add the addresses to the list of our
2011 * external IP addresses.
2013 * @param cls closure
2014 * @param addr one of the addresses of the host, NULL for the last address
2015 * @param addrlen length of the address
2018 process_hostname_ips (void *cls,
2019 const struct sockaddr *addr, socklen_t addrlen)
2021 struct Plugin *plugin = cls;
2025 plugin->hostname_dns = NULL;
2028 /* FIXME: Can we figure out our external address here so it doesn't need to be user specified? */
2029 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
2033 * We can now send a probe message, copy into buffer to really send.
2035 * @param cls closure, a struct TCPProbeContext
2036 * @param size max size to copy
2037 * @param buf buffer to copy message to
2039 static size_t notify_send_probe (void *cls,
2040 size_t size, void *buf)
2042 struct TCPProbeContext *tcp_probe_ctx = cls;
2049 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2050 memcpy(buf, &tcp_probe_ctx->message, sizeof(tcp_probe_ctx->message));
2051 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2052 tcp_probe_ctx->sock);
2054 GNUNET_free(tcp_probe_ctx);
2055 return sizeof(tcp_probe_ctx->message);
2059 * @param cls the plugin handle
2060 * @param tc the scheduling context (for rescheduling this function again)
2062 * We have been notified that gnunet-nat-server has written something to stdout.
2063 * Handle the output, then reschedule this function to be called again once
2064 * more is available.
2068 tcp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2070 struct Plugin *plugin = cls;
2073 memset(&mybuf, 0, sizeof(mybuf));
2077 struct sockaddr_in in_addr;
2078 struct TCPProbeContext *tcp_probe_ctx;
2079 struct GNUNET_CONNECTION_Handle *sock;
2081 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2084 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
2089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2090 _("Finished reading from server stdout with code: %d\n"), bytes);
2096 for (i = 0; i < sizeof(mybuf); i++)
2098 if (mybuf[i] == '\n')
2101 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
2104 port_start = &mybuf[i + 1];
2108 if (port_start != NULL)
2109 port = atoi(port_start);
2112 plugin->server_read_task =
2113 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2114 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2120 _("nat-server-read read: %s port %d\n"), &mybuf, port);
2124 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
2127 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2128 _("nat-server-read malformed address\n"), &mybuf, port);
2130 plugin->server_read_task =
2131 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2132 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2136 in_addr.sin_family = AF_INET;
2137 in_addr.sin_port = htons(port);
2139 * We have received an ICMP response, ostensibly from a non-NAT'd peer
2140 * that wants to connect to us! Send a message to establish a connection.
2142 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, (struct sockaddr *)&in_addr,
2148 plugin->server_read_task =
2149 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2150 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2156 _("Sending TCP probe message!\n"), &mybuf, port);
2158 tcp_probe_ctx = GNUNET_malloc(sizeof(struct TCPProbeContext));
2159 tcp_probe_ctx->message.header.size = htons(sizeof(struct TCP_NAT_ProbeMessage));
2160 tcp_probe_ctx->message.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2161 memcpy(&tcp_probe_ctx->message.clientIdentity, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity));
2162 tcp_probe_ctx->plugin = plugin;
2163 tcp_probe_ctx->sock = sock;
2164 tcp_probe_ctx->transmit_handle = GNUNET_CONNECTION_notify_transmit_ready (sock,
2165 ntohs(tcp_probe_ctx->message.header.size),
2166 GNUNET_TIME_UNIT_FOREVER_REL,
2167 ¬ify_send_probe, tcp_probe_ctx);
2171 /*GNUNET_SERVER_connect_socket(plugin->server, sock);*/
2172 plugin->server_read_task =
2173 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2174 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2178 * Start the gnunet-nat-server process for users behind NAT.
2180 * @param plugin the transport plugin
2182 * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
2185 tcp_transport_start_nat_server(struct Plugin *plugin)
2188 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_NO, GNUNET_YES);
2189 if (plugin->server_stdout == NULL)
2190 return GNUNET_SYSERR;
2193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2194 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
2196 /* Start the server process */
2197 plugin->server_proc = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
2198 if (plugin->server_proc == NULL)
2201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2202 "Failed to start gnunet-nat-server process\n");
2204 return GNUNET_SYSERR;
2206 /* Close the write end of the read pipe */
2207 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
2209 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
2210 plugin->server_read_task =
2211 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2212 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2218 * Return the actual path to a file found in the current
2219 * PATH environment variable.
2221 * @param binary the name of the file to find
2224 get_path_from_PATH (char *binary)
2232 p = getenv ("PATH");
2235 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2236 _("PATH environment variable is unset.\n"));
2239 path = GNUNET_strdup (p); /* because we write on it */
2240 buf = GNUNET_malloc (strlen (path) + 20);
2243 while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
2246 sprintf (buf, "%s/%s", pos, binary);
2247 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2254 sprintf (buf, "%s/%s", pos, binary);
2255 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2266 * Check whether the suid bit is set on a file.
2267 * Attempts to find the file using the current
2268 * PATH environment variable as a search path.
2270 * @param binary the name of the file to check
2273 check_gnunet_nat_binary(char *binary)
2275 struct stat statbuf;
2283 GNUNET_asprintf (&binaryexe, "%s.exe", binary);
2284 p = get_path_from_PATH (binaryexe);
2287 p = get_path_from_PATH (binary);
2291 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2292 _("Could not find binary `%s' in PATH!\n"),
2296 if (0 != STAT (p, &statbuf))
2298 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2299 _("stat (%s) failed: %s\n"),
2303 return GNUNET_SYSERR;
2307 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
2308 (statbuf.st_uid == 0) )
2312 rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
2313 if (INVALID_SOCKET == rawsock)
2315 DWORD err = GetLastError ();
2316 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2317 "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) have failed! GLE = %d\n", err);
2318 return GNUNET_NO; /* not running as administrator */
2320 closesocket (rawsock);
2326 * Entry point for the plugin.
2328 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2329 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2332 libgnunet_plugin_transport_tcp_init (void *cls)
2334 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2335 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2336 sizeof (struct WelcomeMessage)},
2337 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE, sizeof (struct TCP_NAT_ProbeMessage)},
2338 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2341 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2342 struct GNUNET_TRANSPORT_PluginFunctions *api;
2343 struct Plugin *plugin;
2344 struct GNUNET_SERVICE_Context *service;
2345 unsigned long long aport;
2346 unsigned long long bport;
2350 int only_nat_addresses;
2351 char *internal_address;
2352 char *external_address;
2353 struct sockaddr_in in_addr;
2354 struct IPv4TcpAddress t4;
2356 service = GNUNET_SERVICE_start ("transport-tcp", env->cfg);
2357 if (service == NULL)
2359 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2360 _("Failed to start service for `%s' transport plugin.\n"),
2365 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2369 /* We are behind nat (according to the user) */
2370 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
2372 behind_nat = GNUNET_YES;
2376 behind_nat = GNUNET_NO;
2377 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Configuration specified you are behind a NAT, but gnunet-nat-server is not installed properly (suid bit not set)!\n");
2381 behind_nat = GNUNET_NO; /* We are not behind nat! */
2383 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2387 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
2388 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
2391 allow_nat = GNUNET_NO;
2392 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Configuration specified you want to connect to NAT'd peers, but gnunet-nat-client is not installed properly (suid bit not set)!\n");
2396 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
2399 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2401 "ONLY_NAT_ADDRESSES"))
2402 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
2404 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
2406 external_address = NULL;
2407 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
2408 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2411 &external_address)))
2413 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2415 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
2417 GNUNET_SERVICE_stop (service);
2421 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1))
2423 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
2426 internal_address = NULL;
2427 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
2428 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2431 &internal_address)))
2433 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2434 _("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
2436 GNUNET_SERVICE_stop (service);
2437 GNUNET_free_non_null(external_address);
2441 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1))
2443 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
2448 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2454 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2457 &aport)) && (aport > 65535)))
2459 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2461 ("Require valid port number for service `%s' in configuration!\n"),
2463 GNUNET_free_non_null(external_address);
2464 GNUNET_free_non_null(internal_address);
2465 GNUNET_SERVICE_stop (service);
2471 plugin = GNUNET_malloc (sizeof (struct Plugin));
2472 plugin->open_port = bport;
2473 plugin->adv_port = aport;
2474 plugin->external_address = external_address;
2475 plugin->internal_address = internal_address;
2476 plugin->behind_nat = behind_nat;
2477 plugin->allow_nat = allow_nat;
2478 plugin->only_nat_addresses = only_nat_addresses;
2480 plugin->lsock = NULL;
2481 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2483 api->send = &tcp_plugin_send;
2484 api->disconnect = &tcp_plugin_disconnect;
2485 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2486 api->check_address = &tcp_plugin_check_address;
2487 api->address_to_string = &tcp_address_to_string;
2488 plugin->service = service;
2489 plugin->server = GNUNET_SERVICE_get_server (service);
2490 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2491 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2494 sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2496 plugin->handlers[i].callback_cls = plugin;
2497 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2499 if (plugin->behind_nat == GNUNET_YES)
2501 if (GNUNET_YES != tcp_transport_start_nat_server(plugin))
2503 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2506 ("Failed to start %s required for NAT in %s!\n"),
2509 GNUNET_free_non_null(external_address);
2510 GNUNET_free_non_null(internal_address);
2511 GNUNET_SERVICE_stop (service);
2517 if (allow_nat == GNUNET_YES)
2519 plugin->nat_wait_conns = GNUNET_CONTAINER_multihashmap_create(100);
2520 GNUNET_assert(plugin->nat_wait_conns != NULL);
2523 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("TCP transport listening on port %llu\n"), bport);
2525 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2526 _("TCP transport advertises itself as being on port %llu\n"),
2528 GNUNET_SERVER_disconnect_notify (plugin->server,
2531 GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-tcp", "BINDTO", &plugin->bind_address);
2533 if (plugin->behind_nat == GNUNET_NO)
2535 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2538 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->cfg,
2540 HOSTNAME_RESOLVE_TIMEOUT,
2541 &process_hostname_ips,
2544 if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &t4.ipv4_addr) == 1))
2546 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Notifying transport of address %s:0\n", plugin->external_address);
2547 t4.t_port = htons(0);
2548 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
2549 plugin->env->notify_address (plugin->env->cls,
2551 &t4, sizeof(t4), GNUNET_TIME_UNIT_FOREVER_REL);
2553 else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &t4.ipv4_addr) == 1))
2555 t4.t_port = htons(plugin->adv_port);
2556 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Notifying transport of address %s:%d\n", plugin->external_address, plugin->adv_port);
2557 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
2558 plugin->env->notify_address (plugin->env->cls,
2560 &t4, sizeof(t4), GNUNET_TIME_UNIT_FOREVER_REL);
2568 * Exit point from the plugin.
2571 libgnunet_plugin_transport_tcp_done (void *cls)
2573 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2574 struct Plugin *plugin = api->cls;
2575 struct Session *session;
2576 struct LocalAddrList *lal;
2578 while (NULL != (session = plugin->sessions))
2579 disconnect_session (session);
2580 if (NULL != plugin->hostname_dns)
2582 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
2583 plugin->hostname_dns = NULL;
2585 GNUNET_SERVICE_stop (plugin->service);
2586 GNUNET_free (plugin->handlers);
2587 while (NULL != (lal = plugin->lal_head))
2589 GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
2595 if (plugin->behind_nat == GNUNET_YES)
2597 if (0 != GNUNET_OS_process_kill (plugin->server_proc, SIGTERM))
2598 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
2599 GNUNET_OS_process_wait (plugin->server_proc);
2600 GNUNET_OS_process_close (plugin->server_proc);
2601 plugin->server_proc = NULL;
2603 GNUNET_free_non_null(plugin->bind_address);
2604 GNUNET_free (plugin);
2609 /* end of plugin_transport_tcp.c */