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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6 it under the terms of the GNU General Public License as published
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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->plugin->env->sched,
896 session->receive_delay_task);
897 if (session->client != NULL)
898 GNUNET_SERVER_receive_done (session->client,
901 if (session->client != NULL)
902 GNUNET_SERVER_client_drop (session->client);
903 GNUNET_STATISTICS_update (session->plugin->env->stats,
904 gettext_noop ("# TCP sessions active"),
907 GNUNET_free_non_null (session->connect_addr);
908 GNUNET_free (session);
913 * Given two otherwise equivalent sessions, pick the better one.
915 * @param s1 one session (also default)
916 * @param s2 other session
917 * @return "better" session (more active)
919 static struct Session *
920 select_better_session (struct Session *s1,
927 if ( (s1->expecting_welcome == GNUNET_NO) &&
928 (s2->expecting_welcome == GNUNET_YES) )
930 if ( (s1->expecting_welcome == GNUNET_YES) &&
931 (s2->expecting_welcome == GNUNET_NO) )
933 if (s1->last_activity.abs_value < s2->last_activity.abs_value)
935 if (s1->last_activity.abs_value > s2->last_activity.abs_value)
937 if ( (GNUNET_YES == s1->inbound) &&
938 (GNUNET_NO == s2->inbound) )
940 if ( (GNUNET_NO == s1->inbound) &&
941 (GNUNET_YES == s2->inbound) )
948 * We learned about a peer (possibly behind NAT) so run the
949 * gnunet-nat-client to send dummy ICMP responses
951 * @param plugin the plugin for this transport
952 * @param addr the address of the peer
953 * @param addrlen the length of the address
956 run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
958 char inet4[INET_ADDRSTRLEN];
959 char *address_as_string;
960 char *port_as_string;
961 struct GNUNET_OS_Process *proc;
962 const struct sockaddr *sa = (const struct sockaddr *)addr;
965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
966 _("called run_gnunet_nat_client addrlen %d others are %d and %d\n"), addrlen, sizeof (struct sockaddr), sizeof (struct sockaddr_in));
969 if (addrlen < sizeof (struct sockaddr))
972 switch (sa->sa_family)
975 if (addrlen != sizeof (struct sockaddr_in))
977 if (NULL == inet_ntop (AF_INET,
978 &((struct sockaddr_in *) sa)->sin_addr,
979 inet4, INET_ADDRSTRLEN))
981 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
984 address_as_string = GNUNET_strdup (inet4);
991 GNUNET_asprintf(&port_as_string, "%d", plugin->adv_port);
993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
994 _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->adv_port);
997 /* Start the client process */
998 proc = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
999 GNUNET_free(address_as_string);
1000 GNUNET_free(port_as_string);
1001 GNUNET_OS_process_wait (proc);
1002 GNUNET_OS_process_close (proc);
1008 * Function that can be used by the transport service to transmit
1009 * a message using the plugin. Note that in the case of a
1010 * peer disconnecting, the continuation MUST be called
1011 * prior to the disconnect notification itself. This function
1012 * will be called with this peer's HELLO message to initiate
1013 * a fresh connection to another peer.
1015 * @param cls closure
1016 * @param target who should receive this message
1017 * @param msg the message to transmit
1018 * @param msgbuf_size number of bytes in 'msg'
1019 * @param priority how important is the message (most plugins will
1020 * ignore message priority and just FIFO)
1021 * @param timeout how long to wait at most for the transmission (does not
1022 * require plugins to discard the message after the timeout,
1023 * just advisory for the desired delay; most plugins will ignore
1025 * @param session which session must be used (or NULL for "any")
1026 * @param addr the address to use (can be NULL if the plugin
1027 * is "on its own" (i.e. re-use existing TCP connection))
1028 * @param addrlen length of the address in bytes
1029 * @param force_address GNUNET_YES if the plugin MUST use the given address,
1030 * GNUNET_NO means the plugin may use any other address and
1031 * GNUNET_SYSERR means that only reliable existing
1032 * bi-directional connections should be used (regardless
1034 * @param cont continuation to call once the message has
1035 * been transmitted (or if the transport is ready
1036 * for the next transmission call; or if the
1037 * peer disconnected...); can be NULL
1038 * @param cont_cls closure for cont
1039 * @return number of bytes used (on the physical network, with overheads);
1040 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1041 * and does NOT mean that the message was not transmitted (DV and NAT)
1044 tcp_plugin_send (void *cls,
1045 const struct GNUNET_PeerIdentity *target,
1049 struct GNUNET_TIME_Relative timeout,
1050 struct Session *session,
1054 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1056 struct Plugin *plugin = cls;
1057 struct Session *cand_session;
1058 struct Session *next;
1059 struct PendingMessage *pm;
1060 struct GNUNET_CONNECTION_Handle *sa;
1064 struct sockaddr_in a4;
1065 struct sockaddr_in6 a6;
1066 const struct IPv4TcpAddress *t4;
1067 const struct IPv6TcpAddress *t6;
1068 unsigned int is_natd;
1070 GNUNET_STATISTICS_update (plugin->env->stats,
1071 gettext_noop ("# bytes TCP was asked to transmit"),
1074 /* FIXME: we could do this cheaper with a hash table
1075 where we could restrict the iteration to entries that match
1076 the target peer... */
1077 is_natd = GNUNET_NO;
1078 if (session == NULL)
1080 cand_session = NULL;
1081 next = plugin->sessions;
1082 while (NULL != (session = next))
1084 next = session->next;
1085 GNUNET_assert (session->client != NULL);
1086 if (0 != memcmp (target,
1088 sizeof (struct GNUNET_PeerIdentity)))
1090 if ( ( (GNUNET_SYSERR == force_address) &&
1091 (session->expecting_welcome == GNUNET_NO) ) ||
1092 (GNUNET_NO == force_address) )
1094 cand_session = select_better_session (cand_session,
1098 if (GNUNET_SYSERR == force_address)
1100 GNUNET_break (GNUNET_YES == force_address);
1107 if (session->inbound == GNUNET_YES) /* FIXME: why do we ignore inbound sessions? */
1109 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Ignoring inbound session\n");
1113 if ((addrlen != session->connect_alen) && (session->is_nat == GNUNET_NO))
1115 if ((0 != memcmp (session->connect_addr,
1117 addrlen)) && (session->is_nat == GNUNET_NO))
1119 cand_session = select_better_session (cand_session,
1122 session = cand_session;
1124 if ( (session == NULL) &&
1128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1129 "Asked to transmit to `%4s' without address and I have no existing connection (failing).\n",
1130 GNUNET_i2s (target));
1132 GNUNET_STATISTICS_update (plugin->env->stats,
1133 gettext_noop ("# bytes discarded by TCP (no address and no connection)"),
1138 if (session == NULL)
1140 if (addrlen == sizeof (struct IPv6TcpAddress))
1144 memset (&a6, 0, sizeof (a6));
1145 #if HAVE_SOCKADDR_IN_SIN_LEN
1146 a6.sin6_len = sizeof (a6);
1148 a6.sin6_family = AF_INET6;
1149 a6.sin6_port = t6->t6_port;
1150 if (t6->t6_port == 0)
1151 is_natd = GNUNET_YES;
1152 memcpy (&a6.sin6_addr,
1154 sizeof (struct in6_addr));
1158 else if (addrlen == sizeof (struct IPv4TcpAddress))
1162 memset (&a4, 0, sizeof (a4));
1163 #if HAVE_SOCKADDR_IN_SIN_LEN
1164 a4.sin_len = sizeof (a4);
1166 a4.sin_family = AF_INET;
1167 a4.sin_port = t4->t_port;
1168 if (t4->t_port == 0)
1169 is_natd = GNUNET_YES;
1170 a4.sin_addr.s_addr = t4->ipv4_addr;
1176 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1177 _("Address of unexpected length: %u\n"),
1183 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1184 return -1; /* NAT client only works with IPv4 addresses */
1187 if ((plugin->allow_nat == GNUNET_YES) && (is_natd == GNUNET_YES) &&
1188 (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns, &target->hashPubKey)))
1191 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1192 _("Found valid IPv4 NAT address (creating session)!\n"));
1194 session = create_session (plugin,
1198 /* create new message entry */
1199 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1200 /* FIXME: the memset of this malloc can be up to 2% of our total runtime */
1201 pm->msg = (const char*) &pm[1];
1202 memcpy (&pm[1], msg, msgbuf_size);
1203 /* FIXME: this memcpy can be up to 7% of our total run-time
1204 (for transport service) */
1205 pm->message_size = msgbuf_size;
1206 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1207 pm->transmit_cont = cont;
1208 pm->transmit_cont_cls = cont_cls;
1210 /* append pm to pending_messages list */
1211 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1212 session->pending_messages_tail,
1213 session->pending_messages_tail,
1216 GNUNET_assert(GNUNET_CONTAINER_multihashmap_put(plugin->nat_wait_conns, &target->hashPubKey, session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY) == GNUNET_OK);
1218 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1219 "Created NAT WAIT connection to `%4s' at `%s'\n",
1220 GNUNET_i2s (target),
1221 GNUNET_a2s (sb, sbs));
1223 run_gnunet_nat_client (plugin, sb, sbs);
1226 else if ((plugin->allow_nat == GNUNET_YES) && (is_natd == GNUNET_YES) && (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns, &target->hashPubKey)))
1228 /* Only do one NAT punch attempt per peer identity */
1231 sa = GNUNET_CONNECTION_create_from_sockaddr (plugin->env->sched,
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1237 "Failed to create connection to `%4s' at `%s'\n",
1238 GNUNET_i2s (target),
1239 GNUNET_a2s (sb, sbs));
1241 GNUNET_STATISTICS_update (plugin->env->stats,
1242 gettext_noop ("# bytes discarded by TCP (failed to connect)"),
1248 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1249 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1250 GNUNET_i2s (target),
1251 GNUNET_a2s (sb, sbs));
1253 session = create_session (plugin,
1255 GNUNET_SERVER_connect_socket (plugin->server,
1257 session->connect_addr = GNUNET_malloc (addrlen);
1258 memcpy (session->connect_addr,
1261 session->connect_alen = addrlen;
1263 GNUNET_assert (session != NULL);
1264 GNUNET_assert (session->client != NULL);
1265 GNUNET_STATISTICS_update (plugin->env->stats,
1266 gettext_noop ("# bytes currently in TCP buffers"),
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], msg, msgbuf_size);
1273 pm->message_size = msgbuf_size;
1274 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1275 pm->transmit_cont = cont;
1276 pm->transmit_cont_cls = cont_cls;
1278 /* append pm to pending_messages list */
1279 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1280 session->pending_messages_tail,
1281 session->pending_messages_tail,
1284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1285 "Asked to transmit %u bytes to `%s', added message to list.\n",
1287 GNUNET_i2s (target));
1289 process_pending_messages (session);
1295 * Function that can be called to force a disconnect from the
1296 * specified neighbour. This should also cancel all previously
1297 * scheduled transmissions. Obviously the transmission may have been
1298 * partially completed already, which is OK. The plugin is supposed
1299 * to close the connection (if applicable) and no longer call the
1300 * transmit continuation(s).
1302 * Finally, plugin MUST NOT call the services's receive function to
1303 * notify the service that the connection to the specified target was
1304 * closed after a getting this call.
1306 * @param cls closure
1307 * @param target peer for which the last transmission is
1311 tcp_plugin_disconnect (void *cls,
1312 const struct GNUNET_PeerIdentity *target)
1314 struct Plugin *plugin = cls;
1315 struct Session *session;
1316 struct Session *next;
1317 struct PendingMessage *pm;
1320 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1321 "Asked to cancel session with `%4s'\n",
1322 GNUNET_i2s (target));
1324 next = plugin->sessions;
1325 while (NULL != (session = next))
1327 next = session->next;
1328 if (0 != memcmp (target,
1330 sizeof (struct GNUNET_PeerIdentity)))
1332 pm = session->pending_messages_head;
1335 pm->transmit_cont = NULL;
1336 pm->transmit_cont_cls = NULL;
1339 disconnect_session (session);
1345 * Context for address to string conversion.
1347 struct PrettyPrinterContext
1350 * Function to call with the result.
1352 GNUNET_TRANSPORT_AddressStringCallback asc;
1355 * Clsoure for 'asc'.
1360 * Port to add after the IP address.
1367 * Append our port and forward the result.
1369 * @param cls the 'struct PrettyPrinterContext*'
1370 * @param hostname hostname part of the address
1373 append_port (void *cls, const char *hostname)
1375 struct PrettyPrinterContext *ppc = cls;
1378 if (hostname == NULL)
1380 ppc->asc (ppc->asc_cls, NULL);
1384 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1385 ppc->asc (ppc->asc_cls, ret);
1391 * Convert the transports address to a nice, human-readable
1394 * @param cls closure
1395 * @param type name of the transport that generated the address
1396 * @param addr one of the addresses of the host, NULL for the last address
1397 * the specific address format depends on the transport
1398 * @param addrlen length of the address
1399 * @param numeric should (IP) addresses be displayed in numeric form?
1400 * @param timeout after how long should we give up?
1401 * @param asc function to call on each string
1402 * @param asc_cls closure for asc
1405 tcp_plugin_address_pretty_printer (void *cls,
1410 struct GNUNET_TIME_Relative timeout,
1411 GNUNET_TRANSPORT_AddressStringCallback asc,
1414 struct Plugin *plugin = cls;
1415 struct PrettyPrinterContext *ppc;
1418 struct sockaddr_in a4;
1419 struct sockaddr_in6 a6;
1420 const struct IPv4TcpAddress *t4;
1421 const struct IPv6TcpAddress *t6;
1424 if (addrlen == sizeof (struct IPv6TcpAddress))
1427 memset (&a6, 0, sizeof (a6));
1428 a6.sin6_family = AF_INET6;
1429 a6.sin6_port = t6->t6_port;
1430 memcpy (&a6.sin6_addr,
1432 sizeof (struct in6_addr));
1433 port = ntohs (t6->t6_port);
1437 else if (addrlen == sizeof (struct IPv4TcpAddress))
1440 memset (&a4, 0, sizeof (a4));
1441 a4.sin_family = AF_INET;
1442 a4.sin_port = t4->t_port;
1443 a4.sin_addr.s_addr = t4->ipv4_addr;
1444 port = ntohs (t4->t_port);
1450 /* invalid address */
1451 GNUNET_break_op (0);
1452 asc (asc_cls, NULL);
1455 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1457 ppc->asc_cls = asc_cls;
1459 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
1463 !numeric, timeout, &append_port, ppc);
1468 * Check if the given port is plausible (must be either
1469 * our listen port or our advertised port). If it is
1470 * neither, we return GNUNET_SYSERR.
1472 * @param plugin global variables
1473 * @param in_port port number to check
1474 * @return GNUNET_OK if port is either open_port or adv_port
1477 check_port (struct Plugin *plugin, uint16_t in_port)
1479 if ( (plugin->behind_nat == GNUNET_YES) && (in_port == 0) )
1481 if ( (plugin->only_nat_addresses == GNUNET_YES) &&
1482 (plugin->behind_nat == GNUNET_YES) )
1484 return GNUNET_SYSERR; /* odd case... */
1486 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1488 return GNUNET_SYSERR;
1493 * Function that will be called to check if a binary address for this
1494 * plugin is well-formed and corresponds to an address for THIS peer
1495 * (as per our configuration). Naturally, if absolutely necessary,
1496 * plugins can be a bit conservative in their answer, but in general
1497 * plugins should make sure that the address does not redirect
1498 * traffic to a 3rd party that might try to man-in-the-middle our
1501 * @param cls closure, our 'struct Plugin*'
1502 * @param addr pointer to the address
1503 * @param addrlen length of addr
1504 * @return GNUNET_OK if this is a plausible address for this peer
1505 * and transport, GNUNET_SYSERR if not
1508 tcp_plugin_check_address (void *cls,
1512 struct Plugin *plugin = cls;
1513 struct IPv4TcpAddress *v4;
1514 struct IPv6TcpAddress *v6;
1516 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1517 (addrlen != sizeof (struct IPv6TcpAddress)))
1519 GNUNET_break_op (0);
1520 return GNUNET_SYSERR;
1522 if (addrlen == sizeof (struct IPv4TcpAddress))
1524 v4 = (struct IPv4TcpAddress *) addr;
1526 check_port (plugin, ntohs (v4->t_port)))
1527 return GNUNET_SYSERR;
1529 check_local_addr (plugin, &v4->ipv4_addr, sizeof (uint32_t)))
1531 return GNUNET_SYSERR;
1536 v6 = (struct IPv6TcpAddress *) addr;
1537 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1539 GNUNET_break_op (0);
1540 return GNUNET_SYSERR;
1543 check_port (plugin, ntohs (v6->t6_port)))
1544 return GNUNET_SYSERR;
1546 check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
1548 return GNUNET_SYSERR;
1555 * We've received a nat probe from this peer via TCP. Finish
1556 * creating the client session and resume sending of queued
1559 * @param cls closure
1560 * @param client identification of the client
1561 * @param message the actual message
1564 handle_tcp_nat_probe (void *cls,
1565 struct GNUNET_SERVER_Client *client,
1566 const struct GNUNET_MessageHeader *message)
1568 struct Plugin *plugin = cls;
1569 struct Session *session;
1570 struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1573 struct IPv4TcpAddress *t4;
1574 struct IPv6TcpAddress *t6;
1575 const struct sockaddr_in *s4;
1576 const struct sockaddr_in6 *s6;
1579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "received tcp NAT probe\n");
1581 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1582 * a connection to this peer by running gnunet-nat-client. This peer
1583 * received the punch message and now wants us to use the new connection
1584 * as the default for that peer. Do so and then send a WELCOME message
1585 * so we can really be connected!
1587 if (ntohs(message->size) != sizeof(struct TCP_NAT_ProbeMessage))
1590 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));
1595 tcp_nat_probe = (struct TCP_NAT_ProbeMessage *)message;
1597 if (GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity.hashPubKey) == GNUNET_YES)
1600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found session for NAT probe!\n");
1602 session = GNUNET_CONTAINER_multihashmap_get(plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity.hashPubKey);
1603 GNUNET_assert(session != NULL);
1604 GNUNET_assert(GNUNET_CONTAINER_multihashmap_remove(plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity.hashPubKey, session) == GNUNET_YES);
1605 GNUNET_SERVER_client_keep (client);
1606 session->client = client;
1607 session->last_activity = GNUNET_TIME_absolute_get ();
1608 session->inbound = GNUNET_NO;
1611 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1614 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1615 "handle_tcp_nat_probe Found address `%s' for incoming connection %p\n",
1616 GNUNET_a2s (vaddr, alen),
1619 if (((const struct sockaddr *)vaddr)->sa_family == AF_INET)
1622 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1623 t4->t_port = s4->sin_port;
1624 t4->ipv4_addr = s4->sin_addr.s_addr;
1625 session->connect_addr = t4;
1626 session->connect_alen = sizeof (struct IPv4TcpAddress);
1628 else if (((const struct sockaddr *)vaddr)->sa_family == AF_INET6)
1631 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1632 t6->t6_port = s6->sin6_port;
1633 memcpy (&t6->ipv6_addr,
1635 sizeof (struct in6_addr));
1636 session->connect_addr = t6;
1637 session->connect_alen = sizeof (struct IPv6TcpAddress);
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Bad address for incoming connection!\n");
1646 GNUNET_free (vaddr);
1649 session->next = plugin->sessions;
1650 plugin->sessions = session;
1651 GNUNET_STATISTICS_update (plugin->env->stats,
1652 gettext_noop ("# TCP sessions active"),
1655 process_pending_messages (session);
1660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Did NOT find session for NAT probe!\n");
1664 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1668 * We've received a welcome from this peer via TCP. Possibly create a
1669 * fresh client record and send back our welcome.
1671 * @param cls closure
1672 * @param client identification of the client
1673 * @param message the actual message
1676 handle_tcp_welcome (void *cls,
1677 struct GNUNET_SERVER_Client *client,
1678 const struct GNUNET_MessageHeader *message)
1680 struct Plugin *plugin = cls;
1681 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
1682 struct Session *session;
1685 struct IPv4TcpAddress *t4;
1686 struct IPv6TcpAddress *t6;
1687 const struct sockaddr_in *s4;
1688 const struct sockaddr_in6 *s6;
1691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1692 "Received %s message from a `%4s/%p'.\n",
1694 GNUNET_i2s (&wm->clientIdentity), client);
1696 GNUNET_STATISTICS_update (plugin->env->stats,
1697 gettext_noop ("# TCP WELCOME messages received"),
1700 #if MULTIPLE_PEER_SESSIONS
1701 session = find_session_by_client (plugin, client);
1703 session = find_session_by_id(plugin, &wm->clientIdentity);
1706 if (session == NULL)
1708 GNUNET_SERVER_client_keep (client);
1710 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1711 "Received %s message from a `%4s/%p', creating session\n",
1713 GNUNET_i2s (&wm->clientIdentity), client);
1715 session = create_session (plugin,
1716 &wm->clientIdentity, client, GNUNET_NO);
1717 session->inbound = GNUNET_YES;
1719 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1722 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1723 "Found address `%s' for incoming connection %p\n",
1724 GNUNET_a2s (vaddr, alen),
1727 if (alen == sizeof (struct sockaddr_in))
1730 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1731 t4->t_port = s4->sin_port;
1732 t4->ipv4_addr = s4->sin_addr.s_addr;
1733 session->connect_addr = t4;
1734 session->connect_alen = sizeof (struct IPv4TcpAddress);
1736 else if (alen == sizeof (struct sockaddr_in6))
1739 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1740 t6->t6_port = s6->sin6_port;
1741 memcpy (&t6->ipv6_addr,
1743 sizeof (struct in6_addr));
1744 session->connect_addr = t6;
1745 session->connect_alen = sizeof (struct IPv6TcpAddress);
1748 GNUNET_free (vaddr);
1753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1754 "Did not obtain TCP socket address for incoming connection\n");
1758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1759 "Creating new session %p for connection %p\n",
1762 process_pending_messages (session);
1768 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1770 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1771 "Found address `%s' (already have session) for incoming connection %p\n",
1772 GNUNET_a2s (vaddr, alen),
1778 #if MULTIPLE_PEER_SESSIONS
1779 if (session->expecting_welcome != GNUNET_YES)
1781 GNUNET_break_op (0);
1782 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1786 session->last_activity = GNUNET_TIME_absolute_get ();
1787 session->expecting_welcome = GNUNET_NO;
1788 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1793 * Task to signal the server that we can continue
1794 * receiving from the TCP client now.
1796 * @param cls the 'struct Session*'
1797 * @param tc task context (unused)
1800 delayed_done (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1802 struct Session *session = cls;
1803 struct GNUNET_TIME_Relative delay;
1805 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
1806 delay = session->plugin->env->receive (session->plugin->env->cls,
1811 if (delay.rel_value == 0)
1812 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
1814 session->receive_delay_task =
1815 GNUNET_SCHEDULER_add_delayed (session->plugin->env->sched,
1816 delay, &delayed_done, session);
1821 * We've received data for this peer via TCP. Unbox,
1822 * compute latency and forward.
1824 * @param cls closure
1825 * @param client identification of the client
1826 * @param message the actual message
1829 handle_tcp_data (void *cls,
1830 struct GNUNET_SERVER_Client *client,
1831 const struct GNUNET_MessageHeader *message)
1833 struct Plugin *plugin = cls;
1834 struct Session *session;
1835 struct GNUNET_TIME_Relative delay;
1837 if ((GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == ntohs(message->type)) || (ntohs(message->type) == GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE))
1839 /* We don't want to propagate WELCOME and NAT Probe messages up! */
1840 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1843 session = find_session_by_client (plugin, client);
1844 if ( (NULL == session) || (GNUNET_YES == session->expecting_welcome))
1846 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1849 session->last_activity = GNUNET_TIME_absolute_get ();
1851 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1852 "Passing %u bytes of type %u from `%4s' to transport service.\n",
1853 (unsigned int) ntohs (message->size),
1854 (unsigned int) ntohs (message->type),
1855 GNUNET_i2s (&session->target));
1857 GNUNET_STATISTICS_update (plugin->env->stats,
1858 gettext_noop ("# bytes received via TCP"),
1859 ntohs (message->size),
1861 delay = plugin->env->receive (plugin->env->cls, &session->target, message, 1,
1863 (GNUNET_YES == session->inbound) ? NULL : session->connect_addr,
1864 (GNUNET_YES == session->inbound) ? 0 : session->connect_alen);
1865 if (delay.rel_value == 0)
1866 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1868 session->receive_delay_task =
1869 GNUNET_SCHEDULER_add_delayed (session->plugin->env->sched,
1870 delay, &delayed_done, session);
1875 * Functions with this signature are called whenever a peer
1876 * is disconnected on the network level.
1878 * @param cls closure
1879 * @param client identification of the client
1882 disconnect_notify (void *cls,
1883 struct GNUNET_SERVER_Client *client)
1885 struct Plugin *plugin = cls;
1886 struct Session *session;
1890 session = find_session_by_client (plugin, client);
1891 if (session == NULL)
1892 return; /* unknown, nothing to do */
1894 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1895 "Destroying session of `%4s' with %s (%p) due to network-level disconnect.\n",
1896 GNUNET_i2s (&session->target),
1897 (session->connect_addr != NULL) ?
1898 tcp_address_to_string (session->plugin,
1899 session->connect_addr,
1900 session->connect_alen) : "*",
1903 disconnect_session (session);
1908 * Add the IP of our network interface to the list of
1909 * our external IP addresses.
1911 * @param cls the 'struct Plugin*'
1912 * @param name name of the interface
1913 * @param isDefault do we think this may be our default interface
1914 * @param addr address of the interface
1915 * @param addrlen number of bytes in addr
1916 * @return GNUNET_OK to continue iterating
1919 process_interfaces (void *cls,
1922 const struct sockaddr *addr, socklen_t addrlen)
1924 struct Plugin *plugin = cls;
1926 struct IPv4TcpAddress t4;
1927 struct IPv6TcpAddress t6;
1928 struct IPv4TcpAddress t4_nat;
1929 struct IPv6TcpAddress t6_nat;
1933 char buf[INET_ADDRSTRLEN];
1935 af = addr->sa_family;
1939 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1940 GNUNET_assert(NULL != inet_ntop(AF_INET, &t4.ipv4_addr, &buf[0], INET_ADDRSTRLEN));
1941 if ((plugin->bind_address != NULL) && (0 != strcmp(buf, plugin->bind_address)))
1943 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Not notifying transport of address %s\n", "TCP", GNUNET_a2s (addr, addrlen));
1946 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
1947 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
1948 t4.t_port = htons(0);
1949 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
1951 t4_nat.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1952 t4_nat.t_port = htons(plugin->adv_port);
1956 t4.t_port = htons (plugin->adv_port);
1960 else if (af == AF_INET6)
1962 if ((IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr)) || (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(plugin->env->cfg, "transport-tcp", "disablev6")))
1964 /* skip link local addresses */
1967 memcpy (&t6.ipv6_addr,
1968 &((struct sockaddr_in6 *) addr)->sin6_addr,
1969 sizeof (struct in6_addr));
1970 add_to_address_list (plugin, &t6.ipv6_addr, sizeof (struct in6_addr));
1971 if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
1972 t6.t6_port = htons(0);
1973 else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
1975 memcpy (&t6_nat.ipv6_addr,
1976 &((struct sockaddr_in6 *) addr)->sin6_addr,
1977 sizeof (struct in6_addr));
1978 t6_nat.t6_port = htons(plugin->adv_port);
1982 t6.t6_port = htons (plugin->adv_port);
1991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1992 _("Found address `%s' (%s) len %d\n"),
1993 GNUNET_a2s (addr, addrlen), name, args);
1995 plugin->env->notify_address (plugin->env->cls,
1997 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
1999 if (arg_nat != NULL)
2001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2002 _("Found address `%s' (%s) len %d\n"),
2003 GNUNET_a2s (addr, addrlen), name, args);
2004 plugin->env->notify_address (plugin->env->cls,
2006 arg_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
2014 * Function called by the resolver for each address obtained from DNS
2015 * for our own hostname. Add the addresses to the list of our
2016 * external IP addresses.
2018 * @param cls closure
2019 * @param addr one of the addresses of the host, NULL for the last address
2020 * @param addrlen length of the address
2023 process_hostname_ips (void *cls,
2024 const struct sockaddr *addr, socklen_t addrlen)
2026 struct Plugin *plugin = cls;
2030 plugin->hostname_dns = NULL;
2033 /* FIXME: Can we figure out our external address here so it doesn't need to be user specified? */
2034 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
2038 * We can now send a probe message, copy into buffer to really send.
2040 * @param cls closure, a struct TCPProbeContext
2041 * @param size max size to copy
2042 * @param buf buffer to copy message to
2044 static size_t notify_send_probe (void *cls,
2045 size_t size, void *buf)
2047 struct TCPProbeContext *tcp_probe_ctx = cls;
2054 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2055 memcpy(buf, &tcp_probe_ctx->message, sizeof(tcp_probe_ctx->message));
2056 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2057 tcp_probe_ctx->sock);
2059 GNUNET_free(tcp_probe_ctx);
2060 return sizeof(tcp_probe_ctx->message);
2064 * @param cls the plugin handle
2065 * @param tc the scheduling context (for rescheduling this function again)
2067 * We have been notified that gnunet-nat-server has written something to stdout.
2068 * Handle the output, then reschedule this function to be called again once
2069 * more is available.
2073 tcp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2075 struct Plugin *plugin = cls;
2078 memset(&mybuf, 0, sizeof(mybuf));
2082 struct sockaddr_in in_addr;
2083 struct TCPProbeContext *tcp_probe_ctx;
2084 struct GNUNET_CONNECTION_Handle *sock;
2086 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2089 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
2094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2095 _("Finished reading from server stdout with code: %d\n"), bytes);
2101 for (i = 0; i < sizeof(mybuf); i++)
2103 if (mybuf[i] == '\n')
2106 if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
2109 port_start = &mybuf[i + 1];
2113 if (port_start != NULL)
2114 port = atoi(port_start);
2117 plugin->server_read_task =
2118 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
2119 GNUNET_TIME_UNIT_FOREVER_REL,
2120 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2126 _("nat-server-read read: %s port %d\n"), &mybuf, port);
2130 if (inet_pton(AF_INET, &mybuf[0], &in_addr.sin_addr) != 1)
2133 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2134 _("nat-server-read malformed address\n"), &mybuf, port);
2136 plugin->server_read_task =
2137 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
2138 GNUNET_TIME_UNIT_FOREVER_REL,
2139 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2143 in_addr.sin_family = AF_INET;
2144 in_addr.sin_port = htons(port);
2146 * We have received an ICMP response, ostensibly from a non-NAT'd peer
2147 * that wants to connect to us! Send a message to establish a connection.
2149 sock = GNUNET_CONNECTION_create_from_sockaddr (plugin->env->sched, AF_INET, (struct sockaddr *)&in_addr,
2155 plugin->server_read_task =
2156 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
2157 GNUNET_TIME_UNIT_FOREVER_REL,
2158 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2164 _("Sending TCP probe message!\n"), &mybuf, port);
2166 tcp_probe_ctx = GNUNET_malloc(sizeof(struct TCPProbeContext));
2167 tcp_probe_ctx->message.header.size = htons(sizeof(struct TCP_NAT_ProbeMessage));
2168 tcp_probe_ctx->message.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2169 memcpy(&tcp_probe_ctx->message.clientIdentity, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity));
2170 tcp_probe_ctx->plugin = plugin;
2171 tcp_probe_ctx->sock = sock;
2172 tcp_probe_ctx->transmit_handle = GNUNET_CONNECTION_notify_transmit_ready (sock,
2173 ntohs(tcp_probe_ctx->message.header.size),
2174 GNUNET_TIME_UNIT_FOREVER_REL,
2175 ¬ify_send_probe, tcp_probe_ctx);
2179 /*GNUNET_SERVER_connect_socket(plugin->server, sock);*/
2180 plugin->server_read_task =
2181 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
2182 GNUNET_TIME_UNIT_FOREVER_REL,
2183 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2187 * Start the gnunet-nat-server process for users behind NAT.
2189 * @param plugin the transport plugin
2191 * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
2194 tcp_transport_start_nat_server(struct Plugin *plugin)
2197 plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES, GNUNET_NO, GNUNET_YES);
2198 if (plugin->server_stdout == NULL)
2199 return GNUNET_SYSERR;
2202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2203 "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
2205 /* Start the server process */
2206 plugin->server_proc = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
2207 if (plugin->server_proc == NULL)
2210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2211 "Failed to start gnunet-nat-server process\n");
2213 return GNUNET_SYSERR;
2215 /* Close the write end of the read pipe */
2216 GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
2218 plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
2219 plugin->server_read_task =
2220 GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
2221 GNUNET_TIME_UNIT_FOREVER_REL,
2222 plugin->server_stdout_handle, &tcp_plugin_server_read, plugin);
2228 * Return the actual path to a file found in the current
2229 * PATH environment variable.
2231 * @param binary the name of the file to find
2234 get_path_from_PATH (char *binary)
2242 p = getenv ("PATH");
2245 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2246 _("PATH environment variable is unset.\n"));
2249 path = GNUNET_strdup (p); /* because we write on it */
2250 buf = GNUNET_malloc (strlen (path) + 20);
2253 while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
2256 sprintf (buf, "%s/%s", pos, binary);
2257 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2264 sprintf (buf, "%s/%s", pos, binary);
2265 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2276 * Check whether the suid bit is set on a file.
2277 * Attempts to find the file using the current
2278 * PATH environment variable as a search path.
2280 * @param binary the name of the file to check
2283 check_gnunet_nat_binary(char *binary)
2285 struct stat statbuf;
2293 GNUNET_asprintf (&binaryexe, "%s.exe", binary);
2294 p = get_path_from_PATH (binaryexe);
2297 p = get_path_from_PATH (binary);
2301 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2302 _("Could not find binary `%s' in PATH!\n"),
2306 if (0 != STAT (p, &statbuf))
2308 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2309 _("stat (%s) failed: %s\n"),
2313 return GNUNET_SYSERR;
2317 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
2318 (statbuf.st_uid == 0) )
2322 rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
2323 if (INVALID_SOCKET == rawsock)
2325 DWORD err = GetLastError ();
2326 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2327 "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) have failed! GLE = %d\n", err);
2328 return GNUNET_NO; /* not running as administrator */
2330 closesocket (rawsock);
2336 * Entry point for the plugin.
2338 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2339 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2342 libgnunet_plugin_transport_tcp_init (void *cls)
2344 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2345 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2346 sizeof (struct WelcomeMessage)},
2347 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE, sizeof (struct TCP_NAT_ProbeMessage)},
2348 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2351 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2352 struct GNUNET_TRANSPORT_PluginFunctions *api;
2353 struct Plugin *plugin;
2354 struct GNUNET_SERVICE_Context *service;
2355 unsigned long long aport;
2356 unsigned long long bport;
2360 int only_nat_addresses;
2361 char *internal_address;
2362 char *external_address;
2363 struct sockaddr_in in_addr;
2364 struct IPv4TcpAddress t4;
2366 service = GNUNET_SERVICE_start ("transport-tcp", env->sched, env->cfg);
2367 if (service == NULL)
2369 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2370 _("Failed to start service for `%s' transport plugin.\n"),
2375 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2379 /* We are behind nat (according to the user) */
2380 if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
2382 behind_nat = GNUNET_YES;
2386 behind_nat = GNUNET_NO;
2387 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");
2391 behind_nat = GNUNET_NO; /* We are not behind nat! */
2393 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2397 if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
2398 allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
2401 allow_nat = GNUNET_NO;
2402 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");
2406 allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
2409 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2411 "ONLY_NAT_ADDRESSES"))
2412 only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
2414 only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
2416 external_address = NULL;
2417 if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
2418 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2421 &external_address)))
2423 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2425 ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
2427 GNUNET_SERVICE_stop (service);
2431 if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1))
2433 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
2436 internal_address = NULL;
2437 if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
2438 GNUNET_CONFIGURATION_get_value_string (env->cfg,
2441 &internal_address)))
2443 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2444 _("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
2446 GNUNET_SERVICE_stop (service);
2447 GNUNET_free_non_null(external_address);
2451 if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1))
2453 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
2458 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2464 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2467 &aport)) && (aport > 65535)))
2469 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2471 ("Require valid port number for service `%s' in configuration!\n"),
2473 GNUNET_free_non_null(external_address);
2474 GNUNET_free_non_null(internal_address);
2475 GNUNET_SERVICE_stop (service);
2481 plugin = GNUNET_malloc (sizeof (struct Plugin));
2482 plugin->open_port = bport;
2483 plugin->adv_port = aport;
2484 plugin->external_address = external_address;
2485 plugin->internal_address = internal_address;
2486 plugin->behind_nat = behind_nat;
2487 plugin->allow_nat = allow_nat;
2488 plugin->only_nat_addresses = only_nat_addresses;
2490 plugin->lsock = NULL;
2491 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2493 api->send = &tcp_plugin_send;
2494 api->disconnect = &tcp_plugin_disconnect;
2495 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2496 api->check_address = &tcp_plugin_check_address;
2497 api->address_to_string = &tcp_address_to_string;
2498 plugin->service = service;
2499 plugin->server = GNUNET_SERVICE_get_server (service);
2500 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2501 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2504 sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2506 plugin->handlers[i].callback_cls = plugin;
2507 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2509 if (plugin->behind_nat == GNUNET_YES)
2511 if (GNUNET_YES != tcp_transport_start_nat_server(plugin))
2513 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2516 ("Failed to start %s required for NAT in %s!\n"),
2519 GNUNET_free_non_null(external_address);
2520 GNUNET_free_non_null(internal_address);
2521 GNUNET_SERVICE_stop (service);
2527 if (allow_nat == GNUNET_YES)
2529 plugin->nat_wait_conns = GNUNET_CONTAINER_multihashmap_create(100);
2530 GNUNET_assert(plugin->nat_wait_conns != NULL);
2533 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("TCP transport listening on port %llu\n"), bport);
2535 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2536 _("TCP transport advertises itself as being on port %llu\n"),
2538 GNUNET_SERVER_disconnect_notify (plugin->server,
2541 GNUNET_CONFIGURATION_get_value_string(env->cfg, "transport-tcp", "BINDTO", &plugin->bind_address);
2543 if (plugin->behind_nat == GNUNET_NO)
2545 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2548 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
2551 HOSTNAME_RESOLVE_TIMEOUT,
2552 &process_hostname_ips,
2555 if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &t4.ipv4_addr) == 1))
2557 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Notifying transport of address %s:0\n", plugin->external_address);
2558 t4.t_port = htons(0);
2559 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
2560 plugin->env->notify_address (plugin->env->cls,
2562 &t4, sizeof(t4), GNUNET_TIME_UNIT_FOREVER_REL);
2564 else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &t4.ipv4_addr) == 1))
2566 t4.t_port = htons(plugin->adv_port);
2567 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Notifying transport of address %s:%d\n", plugin->external_address, plugin->adv_port);
2568 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
2569 plugin->env->notify_address (plugin->env->cls,
2571 &t4, sizeof(t4), GNUNET_TIME_UNIT_FOREVER_REL);
2579 * Exit point from the plugin.
2582 libgnunet_plugin_transport_tcp_done (void *cls)
2584 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2585 struct Plugin *plugin = api->cls;
2586 struct Session *session;
2587 struct LocalAddrList *lal;
2589 while (NULL != (session = plugin->sessions))
2590 disconnect_session (session);
2591 if (NULL != plugin->hostname_dns)
2593 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
2594 plugin->hostname_dns = NULL;
2596 GNUNET_SERVICE_stop (plugin->service);
2597 GNUNET_free (plugin->handlers);
2598 while (NULL != (lal = plugin->lal_head))
2600 GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
2606 if (plugin->behind_nat == GNUNET_YES)
2608 if (0 != GNUNET_OS_process_kill (plugin->server_proc, SIGTERM))
2609 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
2610 GNUNET_OS_process_wait (plugin->server_proc);
2611 GNUNET_OS_process_close (plugin->server_proc);
2612 plugin->server_proc = NULL;
2614 GNUNET_free_non_null(plugin->bind_address);
2615 GNUNET_free (plugin);
2620 /* end of plugin_transport_tcp.c */