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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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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_nat_lib.h"
30 #include "gnunet_os_lib.h"
31 #include "gnunet_protocols.h"
32 #include "gnunet_resolver_service.h"
33 #include "gnunet_server_lib.h"
34 #include "gnunet_service_lib.h"
35 #include "gnunet_signatures.h"
36 #include "gnunet_statistics_service.h"
37 #include "gnunet_transport_service.h"
38 #include "gnunet_transport_plugin.h"
39 #include "transport.h"
41 #define DEBUG_TCP GNUNET_YES
43 #define DEBUG_TCP_NAT GNUNET_NO
46 * How long until we give up on transmitting the welcome message?
48 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
52 * Initial handshake message for a session.
57 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME.
59 struct GNUNET_MessageHeader header;
62 * Identity of the node connecting (TCP client)
64 struct GNUNET_PeerIdentity clientIdentity;
70 * Basically a WELCOME message, but with the purpose
71 * of giving the waiting peer a client handle to use
73 struct TCP_NAT_ProbeMessage
76 * Type is GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
78 struct GNUNET_MessageHeader header;
81 * Identity of the sender of the message.
83 struct GNUNET_PeerIdentity clientIdentity;
89 * Context for sending a NAT probe via TCP.
91 struct TCPProbeContext
95 * Active probes are kept in a DLL.
97 struct TCPProbeContext *next;
100 * Active probes are kept in a DLL.
102 struct TCPProbeContext *prev;
107 struct GNUNET_CONNECTION_Handle *sock;
110 * Message to be sent.
112 struct TCP_NAT_ProbeMessage message;
115 * Handle to the transmission.
117 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
120 * Transport plugin handle.
122 struct Plugin *plugin;
127 * Network format for IPv4 addresses.
129 struct IPv4TcpAddress
132 * IPv4 address, in network byte order.
134 uint32_t ipv4_addr GNUNET_PACKED;
137 * Port number, in network byte order.
139 uint16_t t_port GNUNET_PACKED;
145 * Network format for IPv6 addresses.
147 struct IPv6TcpAddress
152 struct in6_addr ipv6_addr GNUNET_PACKED;
155 * Port number, in network byte order.
157 uint16_t t6_port GNUNET_PACKED;
163 * Encapsulation of all of the state of the plugin.
169 * Local network addresses (actual IP address follows this struct).
170 * PORT is NOT included!
176 * This is a doubly linked list.
178 struct LocalAddrList *next;
181 * This is a doubly linked list.
183 struct LocalAddrList *prev;
188 struct Plugin *plugin;
191 * Handle to NAT holes we've tried to punch for this address.
193 struct GNUNET_NAT_Handle *nat;
196 * Pointer to a 'struct IPv4/V6TcpAddress' describing our external IP and port
197 * as obtained from the NAT by automatic port mapping.
199 void *external_nat_address;
202 * Number of bytes in 'external_nat_address'
207 * Number of bytes of the address that follow
215 * Information kept for each message that is yet to
218 struct PendingMessage
222 * This is a doubly-linked list.
224 struct PendingMessage *next;
227 * This is a doubly-linked list.
229 struct PendingMessage *prev;
232 * The pending message
237 * Continuation function to call once the message
238 * has been sent. Can be NULL if there is no
239 * continuation to call.
241 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
244 * Closure for transmit_cont.
246 void *transmit_cont_cls;
249 * Timeout value for the pending message.
251 struct GNUNET_TIME_Absolute timeout;
254 * So that the gnunet-service-transport can group messages together,
255 * these pending messages need to accept a message buffer and size
256 * instead of just a GNUNET_MessageHeader.
264 * Session handle for TCP connections.
272 struct SessionHeader header;
275 * Stored in a linked list.
277 struct Session *next;
280 * Pointer to the global plugin struct.
282 struct Plugin *plugin;
285 * The client (used to identify this connection)
287 struct GNUNET_SERVER_Client *client;
290 * Messages currently pending for transmission
291 * to this peer, if any.
293 struct PendingMessage *pending_messages_head;
296 * Messages currently pending for transmission
297 * to this peer, if any.
299 struct PendingMessage *pending_messages_tail;
302 * Handle for pending transmission request.
304 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
307 * To whom are we talking to (set to our identity
308 * if we are still waiting for the welcome message)
310 struct GNUNET_PeerIdentity target;
313 * ID of task used to delay receiving more to throttle sender.
315 GNUNET_SCHEDULER_TaskIdentifier receive_delay_task;
318 * Address of the other peer (either based on our 'connect'
319 * call or on our 'accept' call).
324 * Last activity on this connection. Used to select preferred
327 struct GNUNET_TIME_Absolute last_activity;
330 * Length of connect_addr.
335 * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
337 int expecting_welcome;
340 * Was this a connection that was inbound (we accepted)? (GNUNET_YES/GNUNET_NO)
345 * Was this session created using NAT traversal?
353 * Encapsulation of all of the state of the plugin.
360 struct GNUNET_TRANSPORT_PluginEnvironment *env;
365 struct GNUNET_CONNECTION_Handle *lsock;
368 * stdout pipe handle for the gnunet-nat-server process
370 struct GNUNET_DISK_PipeHandle *server_stdout;
373 * stdout file handle (for reading) for the gnunet-nat-server process
375 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
378 * ID of select gnunet-nat-server stdout read task
380 GNUNET_SCHEDULER_TaskIdentifier server_read_task;
383 * The process id of the server process (if behind NAT)
385 struct GNUNET_OS_Process *server_proc;
388 * List of open TCP sessions.
390 struct Session *sessions;
393 * Handle to the network service.
395 struct GNUNET_SERVICE_Context *service;
398 * Handle to the server for this service.
400 struct GNUNET_SERVER_Handle *server;
403 * Copy of the handler array where the closures are
404 * set to this struct's instance.
406 struct GNUNET_SERVER_MessageHandler *handlers;
409 * Handle for request of hostname resolution, non-NULL if pending.
411 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
414 * Map of peers we have tried to contact behind a NAT
416 struct GNUNET_CONTAINER_MultiHashMap *nat_wait_conns;
419 * The external address given to us by the user. Used for HELLOs
420 * and address validation.
422 char *external_address;
425 * The internal address given to us by the user (or discovered).
426 * Used for NAT traversal (ICMP method), but not as a 'validateable'
429 char *internal_address;
432 * Address given for us to bind to (ONLY).
437 * List of our IP addresses.
439 struct LocalAddrList *lal_head;
442 * Tail of our IP address list.
444 struct LocalAddrList *lal_tail;
447 * List of active TCP probes.
449 struct TCPProbeContext *probe_head;
452 * List of active TCP probes.
454 struct TCPProbeContext *probe_tail;
457 * Handle for (DYN)DNS lookup of our external IP.
459 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
462 * ID of task used to update our addresses when one expires.
464 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
467 * Port that we are actually listening on.
472 * Port that the user said we would have visible to the
478 * Is this transport configured to be behind a NAT?
483 * Has the NAT been punched?
488 * Is this transport configured to allow connections to NAT'd peers?
490 int enable_nat_client;
493 * Should we run the gnunet-nat-server?
495 int enable_nat_server;
498 * Are we allowed to try UPnP/PMP for NAT traversal?
506 * Our external IP address/port mapping has changed.
508 * @param cls closure, the 'struct LocalAddrList'
509 * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
510 * the previous (now invalid) one
511 * @param addr either the previous or the new public IP address
512 * @param addrlen actual lenght of the address
515 nat_port_map_callback (void *cls,
517 const struct sockaddr *addr,
520 struct LocalAddrList *lal = cls;
521 struct Plugin *plugin = lal->plugin;
523 struct IPv4TcpAddress t4;
524 struct IPv6TcpAddress t6;
528 /* convert 'addr' to our internal format */
529 af = addr->sa_family;
533 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
534 t6.t6_port = ((struct sockaddr_in *) addr)->sin_port;
539 memcpy (&t6.ipv6_addr,
540 &((struct sockaddr_in6 *) addr)->sin6_addr,
541 sizeof (struct in6_addr));
542 t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
551 /* modify our published address list */
552 if (GNUNET_YES == add_remove)
554 plugin->env->notify_address (plugin->env->cls,
556 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
557 GNUNET_free_non_null (lal->external_nat_address);
558 lal->external_nat_address = GNUNET_memdup (arg, args);
559 lal->ena_size = args;
563 plugin->env->notify_address (plugin->env->cls,
565 arg, args, GNUNET_TIME_UNIT_ZERO);
566 GNUNET_free_non_null (lal->external_nat_address);
573 * Add the given address to the list of 'local' addresses, thereby
574 * making it a 'legal' address for this peer to have.
576 * @param plugin the plugin
577 * @param arg the address, either an IPv4 or an IPv6 IP address
578 * @param arg_size number of bytes in arg
581 add_to_address_list (struct Plugin *plugin,
585 struct LocalAddrList *lal;
586 struct sockaddr_in v4;
587 struct sockaddr_in6 v6;
588 const struct sockaddr *sa;
591 lal = plugin->lal_head;
594 if ( (lal->size == arg_size) &&
595 (0 == memcmp (&lal[1], arg, arg_size)) )
599 lal = GNUNET_malloc (sizeof (struct LocalAddrList) + arg_size);
600 lal->plugin = plugin;
601 lal->size = arg_size;
602 memcpy (&lal[1], arg, arg_size);
603 GNUNET_CONTAINER_DLL_insert (plugin->lal_head,
606 if (plugin->open_port == 0)
607 return; /* we're not listening at all... */
608 if (arg_size == sizeof (struct in_addr))
610 memset (&v4, 0, sizeof (v4));
611 v4.sin_family = AF_INET;
612 v4.sin_port = htons (plugin->open_port);
613 memcpy (&v4.sin_addr, arg, arg_size);
614 #if HAVE_SOCKADDR_IN_SIN_LEN
615 v4.sin_len = sizeof (struct sockaddr_in);
617 sa = (const struct sockaddr*) &v4;
620 else if (arg_size == sizeof (struct in6_addr))
622 memset (&v6, 0, sizeof (v6));
623 v6.sin6_family = AF_INET6;
624 v6.sin6_port = htons (plugin->open_port);
625 memcpy (&v6.sin6_addr, arg, arg_size);
626 #if HAVE_SOCKADDR_IN_SIN_LEN
627 v6.sin6_len = sizeof (struct sockaddr_in6);
629 sa = (const struct sockaddr*) &v6;
637 if ( (plugin->behind_nat == GNUNET_YES) &&
638 (plugin->enable_upnp == GNUNET_YES) )
639 lal->nat = GNUNET_NAT_register (sa, salen,
640 &nat_port_map_callback,
646 * Check if the given address is in the list of 'local' addresses.
648 * @param plugin the plugin
649 * @param arg the address, either an IPv4 or an IPv6 IP address
650 * @param arg_size number of bytes in arg
651 * @return GNUNET_OK if this is one of our IPs, GNUNET_SYSERR if not
654 check_local_addr (struct Plugin *plugin,
658 struct LocalAddrList *lal;
660 lal = plugin->lal_head;
663 if ( (lal->size == arg_size) &&
664 (0 == memcmp (&lal[1], arg, arg_size)) )
668 return GNUNET_SYSERR;
673 * Check if the given address is in the list of 'mapped' addresses.
675 * @param plugin the plugin
676 * @param arg the address, either a 'struct IPv4TcpAddress' or a 'struct IPv6TcpAddress'
677 * @param arg_size number of bytes in arg
678 * @return GNUNET_OK if this is one of our IPs, GNUNET_SYSERR if not
681 check_mapped_addr (struct Plugin *plugin,
685 struct LocalAddrList *lal;
687 lal = plugin->lal_head;
690 if ( (lal->ena_size == arg_size) &&
691 (0 == memcmp (lal->external_nat_address, arg, arg_size)) )
695 return GNUNET_SYSERR;
700 * Function called for a quick conversion of the binary address to
701 * a numeric address. Note that the caller must not free the
702 * address and that the next call to this function is allowed
703 * to override the address again.
705 * @param cls closure ('struct Plugin*')
706 * @param addr binary address
707 * @param addrlen length of the address
708 * @return string representing the same address
711 tcp_address_to_string (void *cls,
715 static char rbuf[INET6_ADDRSTRLEN + 12];
716 char buf[INET6_ADDRSTRLEN];
720 const struct IPv4TcpAddress *t4;
721 const struct IPv6TcpAddress *t6;
725 if (addrlen == sizeof (struct IPv6TcpAddress))
729 port = ntohs (t6->t6_port);
730 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
733 else if (addrlen == sizeof (struct IPv4TcpAddress))
737 port = ntohs (t4->t_port);
738 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
743 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
745 _("Unexpected address length: %u\n"),
750 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
752 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
755 GNUNET_snprintf (rbuf,
757 (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
765 * Find the session handle for the given client.
767 * @param plugin the plugin
768 * @param client which client to find the session handle for
769 * @return NULL if no matching session exists
771 static struct Session *
772 find_session_by_client (struct Plugin *plugin,
773 const struct GNUNET_SERVER_Client *client)
777 ret = plugin->sessions;
778 while ((ret != NULL) && (client != ret->client))
785 * Create a new session. Also queues a welcome message.
787 * @param plugin the plugin
788 * @param target peer to connect to
789 * @param client client to use
790 * @param is_nat this a NAT session, we should wait for a client to
791 * connect to us from an address, then assign that to
793 * @return new session object
795 static struct Session *
796 create_session (struct Plugin *plugin,
797 const struct GNUNET_PeerIdentity *target,
798 struct GNUNET_SERVER_Client *client,
802 struct PendingMessage *pm;
803 struct WelcomeMessage welcome;
805 if (is_nat != GNUNET_YES)
806 GNUNET_assert (client != NULL);
808 GNUNET_assert (client == NULL);
810 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
812 "Creating new session for peer `%4s'\n",
813 GNUNET_i2s (target));
815 ret = GNUNET_malloc (sizeof (struct Session));
816 ret->last_activity = GNUNET_TIME_absolute_get ();
817 ret->plugin = plugin;
818 ret->is_nat = is_nat;
819 if (is_nat != GNUNET_YES) /* If not a NAT WAIT conn, add it to global list */
821 ret->next = plugin->sessions;
822 plugin->sessions = ret;
824 ret->client = client;
825 ret->target = *target;
826 ret->expecting_welcome = GNUNET_YES;
827 pm = GNUNET_malloc (sizeof (struct PendingMessage) + sizeof (struct WelcomeMessage));
828 pm->msg = (const char*) &pm[1];
829 pm->message_size = sizeof (struct WelcomeMessage);
830 welcome.header.size = htons (sizeof (struct WelcomeMessage));
831 welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
832 welcome.clientIdentity = *plugin->env->my_identity;
833 memcpy (&pm[1], &welcome, sizeof (welcome));
834 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
835 GNUNET_STATISTICS_update (plugin->env->stats,
836 gettext_noop ("# bytes currently in TCP buffers"),
839 GNUNET_CONTAINER_DLL_insert (ret->pending_messages_head,
840 ret->pending_messages_tail,
842 if (is_nat != GNUNET_YES)
843 GNUNET_STATISTICS_update (plugin->env->stats,
844 gettext_noop ("# TCP sessions active"),
852 * If we have pending messages, ask the server to
853 * transmit them (schedule the respective tasks, etc.)
855 * @param session for which session should we do this
857 static void process_pending_messages (struct Session *session);
861 * Function called to notify a client about the socket
862 * being ready to queue more data. "buf" will be
863 * NULL and "size" zero if the socket was closed for
864 * writing in the meantime.
867 * @param size number of bytes available in buf
868 * @param buf where the callee should write the message
869 * @return number of bytes written to buf
872 do_transmit (void *cls, size_t size, void *buf)
874 struct Session *session = cls;
875 struct GNUNET_PeerIdentity pid;
876 struct Plugin *plugin;
877 struct PendingMessage *pos;
878 struct PendingMessage *hd;
879 struct PendingMessage *tl;
880 struct GNUNET_TIME_Absolute now;
884 session->transmit_handle = NULL;
885 plugin = session->plugin;
889 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
891 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
892 GNUNET_i2s (&session->target));
894 /* timeout; cancel all messages that have already expired */
898 now = GNUNET_TIME_absolute_get ();
899 while ( (NULL != (pos = session->pending_messages_head)) &&
900 (pos->timeout.abs_value <= now.abs_value) )
902 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
903 session->pending_messages_tail,
906 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
908 "Failed to transmit %u byte message to `%4s'.\n",
910 GNUNET_i2s (&session->target));
912 ret += pos->message_size;
913 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
915 /* do this call before callbacks (so that if callbacks destroy
916 session, they have a chance to cancel actions done by this
918 process_pending_messages (session);
919 pid = session->target;
920 /* no do callbacks and do not use session again since
921 the callbacks may abort the session */
922 while (NULL != (pos = hd))
924 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
925 if (pos->transmit_cont != NULL)
926 pos->transmit_cont (pos->transmit_cont_cls,
927 &pid, GNUNET_SYSERR);
930 GNUNET_STATISTICS_update (plugin->env->stats,
931 gettext_noop ("# bytes currently in TCP buffers"),
934 GNUNET_STATISTICS_update (plugin->env->stats,
935 gettext_noop ("# bytes discarded by TCP (timeout)"),
940 /* copy all pending messages that would fit */
945 while (NULL != (pos = session->pending_messages_head))
947 if (ret + pos->message_size > size)
949 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
950 session->pending_messages_tail,
952 GNUNET_assert (size >= pos->message_size);
953 /* FIXME: this memcpy can be up to 7% of our total runtime */
954 memcpy (cbuf, pos->msg, pos->message_size);
955 cbuf += pos->message_size;
956 ret += pos->message_size;
957 size -= pos->message_size;
958 GNUNET_CONTAINER_DLL_insert_after (hd, tl, tl, pos);
960 /* schedule 'continuation' before callbacks so that callbacks that
961 cancel everything don't cause us to use a session that no longer
963 process_pending_messages (session);
964 session->last_activity = GNUNET_TIME_absolute_get ();
965 pid = session->target;
966 /* we'll now call callbacks that may cancel the session; hence
967 we should not use 'session' after this point */
968 while (NULL != (pos = hd))
970 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
971 if (pos->transmit_cont != NULL)
972 pos->transmit_cont (pos->transmit_cont_cls,
976 GNUNET_assert (hd == NULL);
977 GNUNET_assert (tl == NULL);
979 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
981 "Transmitting %u bytes\n",
984 GNUNET_STATISTICS_update (plugin->env->stats,
985 gettext_noop ("# bytes currently in TCP buffers"),
988 GNUNET_STATISTICS_update (plugin->env->stats,
989 gettext_noop ("# bytes transmitted via TCP"),
997 * If we have pending messages, ask the server to
998 * transmit them (schedule the respective tasks, etc.)
1000 * @param session for which session should we do this
1003 process_pending_messages (struct Session *session)
1005 struct PendingMessage *pm;
1007 GNUNET_assert (session->client != NULL);
1008 if (session->transmit_handle != NULL)
1010 if (NULL == (pm = session->pending_messages_head))
1013 session->transmit_handle
1014 = GNUNET_SERVER_notify_transmit_ready (session->client,
1016 GNUNET_TIME_absolute_get_remaining
1018 &do_transmit, session);
1023 * Functions with this signature are called whenever we need
1024 * to close a session due to a disconnect or failure to
1025 * establish a connection.
1027 * @param session session to close down
1030 disconnect_session (struct Session *session)
1032 struct Session *prev;
1033 struct Session *pos;
1034 struct PendingMessage *pm;
1037 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1039 "Disconnecting from `%4s' at %s.\n",
1040 GNUNET_i2s (&session->target),
1041 (session->connect_addr != NULL) ?
1042 tcp_address_to_string (session->plugin,
1043 session->connect_addr,
1044 session->connect_alen) : "*");
1046 /* remove from session list */
1048 pos = session->plugin->sessions;
1049 while (pos != session)
1055 session->plugin->sessions = session->next;
1057 prev->next = session->next;
1058 session->plugin->env->session_end (session->plugin->env->cls,
1061 /* clean up state */
1062 if (session->transmit_handle != NULL)
1064 GNUNET_CONNECTION_notify_transmit_ready_cancel
1065 (session->transmit_handle);
1066 session->transmit_handle = NULL;
1068 while (NULL != (pm = session->pending_messages_head))
1071 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1073 pm->transmit_cont != NULL
1074 ? "Could not deliver message to `%4s'.\n"
1075 : "Could not deliver message to `%4s', notifying.\n",
1076 GNUNET_i2s (&session->target));
1078 GNUNET_STATISTICS_update (session->plugin->env->stats,
1079 gettext_noop ("# bytes currently in TCP buffers"),
1080 - (int64_t) pm->message_size,
1082 GNUNET_STATISTICS_update (session->plugin->env->stats,
1083 gettext_noop ("# bytes discarded by TCP (disconnect)"),
1086 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1087 session->pending_messages_tail,
1089 if (NULL != pm->transmit_cont)
1090 pm->transmit_cont (pm->transmit_cont_cls,
1091 &session->target, GNUNET_SYSERR);
1094 GNUNET_break (session->client != NULL);
1095 if (session->receive_delay_task != GNUNET_SCHEDULER_NO_TASK)
1097 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1098 if (session->client != NULL)
1099 GNUNET_SERVER_receive_done (session->client,
1102 else if (session->client != NULL)
1103 GNUNET_SERVER_client_drop (session->client);
1104 GNUNET_STATISTICS_update (session->plugin->env->stats,
1105 gettext_noop ("# TCP sessions active"),
1108 GNUNET_free_non_null (session->connect_addr);
1109 GNUNET_free (session);
1114 * Given two otherwise equivalent sessions, pick the better one.
1116 * @param s1 one session (also default)
1117 * @param s2 other session
1118 * @return "better" session (more active)
1120 static struct Session *
1121 select_better_session (struct Session *s1,
1128 if ( (s1->expecting_welcome == GNUNET_NO) &&
1129 (s2->expecting_welcome == GNUNET_YES) )
1131 if ( (s1->expecting_welcome == GNUNET_YES) &&
1132 (s2->expecting_welcome == GNUNET_NO) )
1134 if (s1->last_activity.abs_value < s2->last_activity.abs_value)
1136 if (s1->last_activity.abs_value > s2->last_activity.abs_value)
1138 if ( (GNUNET_YES == s1->inbound) &&
1139 (GNUNET_NO == s2->inbound) )
1141 if ( (GNUNET_NO == s1->inbound) &&
1142 (GNUNET_YES == s2->inbound) )
1149 * We learned about a peer (possibly behind NAT) so run the
1150 * gnunet-nat-client to send dummy ICMP responses.
1152 * @param plugin the plugin for this transport
1153 * @param sa the address of the peer (IPv4-only)
1156 run_gnunet_nat_client (struct Plugin *plugin,
1157 const struct sockaddr_in *sa)
1159 char inet4[INET_ADDRSTRLEN];
1160 char port_as_string[6];
1161 struct GNUNET_OS_Process *proc;
1163 if (plugin->internal_address == NULL)
1165 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
1167 _("Internal IP address not known, cannot use ICMP NAT traversal method\n"));
1170 GNUNET_assert (sa->sin_family == AF_INET);
1171 if (NULL == inet_ntop (AF_INET,
1173 inet4, INET_ADDRSTRLEN))
1175 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
1178 GNUNET_snprintf(port_as_string,
1179 sizeof (port_as_string),
1183 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1185 _("Running gnunet-nat-client %s %s %u\n"),
1186 plugin->internal_address,
1188 (unsigned int) plugin->adv_port);
1190 proc = GNUNET_OS_start_process (NULL,
1192 "gnunet-nat-client",
1193 "gnunet-nat-client",
1194 plugin->internal_address,
1200 /* we know that the gnunet-nat-client will terminate virtually
1202 GNUNET_OS_process_wait (proc);
1203 GNUNET_OS_process_close (proc);
1208 * Function that can be used by the transport service to transmit
1209 * a message using the plugin. Note that in the case of a
1210 * peer disconnecting, the continuation MUST be called
1211 * prior to the disconnect notification itself. This function
1212 * will be called with this peer's HELLO message to initiate
1213 * a fresh connection to another peer.
1215 * @param cls closure
1216 * @param target who should receive this message
1217 * @param msg the message to transmit
1218 * @param msgbuf_size number of bytes in 'msg'
1219 * @param priority how important is the message (most plugins will
1220 * ignore message priority and just FIFO)
1221 * @param timeout how long to wait at most for the transmission (does not
1222 * require plugins to discard the message after the timeout,
1223 * just advisory for the desired delay; most plugins will ignore
1225 * @param session which session must be used (or NULL for "any")
1226 * @param addr the address to use (can be NULL if the plugin
1227 * is "on its own" (i.e. re-use existing TCP connection))
1228 * @param addrlen length of the address in bytes
1229 * @param force_address GNUNET_YES if the plugin MUST use the given address,
1230 * GNUNET_NO means the plugin may use any other address and
1231 * GNUNET_SYSERR means that only reliable existing
1232 * bi-directional connections should be used (regardless
1234 * @param cont continuation to call once the message has
1235 * been transmitted (or if the transport is ready
1236 * for the next transmission call; or if the
1237 * peer disconnected...); can be NULL
1238 * @param cont_cls closure for cont
1239 * @return number of bytes used (on the physical network, with overheads);
1240 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1241 * and does NOT mean that the message was not transmitted (DV and NAT)
1244 tcp_plugin_send (void *cls,
1245 const struct GNUNET_PeerIdentity *target,
1249 struct GNUNET_TIME_Relative timeout,
1250 struct Session *session,
1254 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1256 struct Plugin *plugin = cls;
1257 struct Session *cand_session;
1258 struct Session *next;
1259 struct PendingMessage *pm;
1260 struct GNUNET_CONNECTION_Handle *sa;
1264 struct sockaddr_in a4;
1265 struct sockaddr_in6 a6;
1266 const struct IPv4TcpAddress *t4;
1267 const struct IPv6TcpAddress *t6;
1268 unsigned int is_natd;
1270 GNUNET_STATISTICS_update (plugin->env->stats,
1271 gettext_noop ("# bytes TCP was asked to transmit"),
1274 /* FIXME: we could do this cheaper with a hash table
1275 where we could restrict the iteration to entries that match
1276 the target peer... */
1277 is_natd = GNUNET_NO;
1278 if (session == NULL)
1280 cand_session = NULL;
1281 next = plugin->sessions;
1282 while (NULL != (session = next))
1284 next = session->next;
1285 GNUNET_assert (session->client != NULL);
1286 if (0 != memcmp (target,
1288 sizeof (struct GNUNET_PeerIdentity)))
1290 if ( ( (GNUNET_SYSERR == force_address) &&
1291 (session->expecting_welcome == GNUNET_NO) ) ||
1292 (GNUNET_NO == force_address) )
1294 cand_session = select_better_session (cand_session,
1298 if (GNUNET_SYSERR == force_address)
1300 GNUNET_break (GNUNET_YES == force_address);
1306 if ( (addrlen != session->connect_alen) &&
1307 (session->is_nat == GNUNET_NO) )
1309 if ((0 != memcmp (session->connect_addr,
1311 addrlen)) && (session->is_nat == GNUNET_NO))
1313 cand_session = select_better_session (cand_session,
1316 session = cand_session;
1318 if ( (session == NULL) &&
1322 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1324 "Asked to transmit to `%4s' without address and I have no existing connection (failing).\n",
1325 GNUNET_i2s (target));
1327 GNUNET_STATISTICS_update (plugin->env->stats,
1328 gettext_noop ("# bytes discarded by TCP (no address and no connection)"),
1333 if (session == NULL)
1335 if (addrlen == sizeof (struct IPv6TcpAddress))
1339 memset (&a6, 0, sizeof (a6));
1340 #if HAVE_SOCKADDR_IN_SIN_LEN
1341 a6.sin6_len = sizeof (a6);
1343 a6.sin6_family = AF_INET6;
1344 a6.sin6_port = t6->t6_port;
1345 if (t6->t6_port == 0)
1346 is_natd = GNUNET_YES;
1347 memcpy (&a6.sin6_addr,
1349 sizeof (struct in6_addr));
1353 else if (addrlen == sizeof (struct IPv4TcpAddress))
1357 memset (&a4, 0, sizeof (a4));
1358 #if HAVE_SOCKADDR_IN_SIN_LEN
1359 a4.sin_len = sizeof (a4);
1361 a4.sin_family = AF_INET;
1362 a4.sin_port = t4->t_port;
1363 if (t4->t_port == 0)
1364 is_natd = GNUNET_YES;
1365 a4.sin_addr.s_addr = t4->ipv4_addr;
1371 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1373 _("Address of unexpected length: %u\n"),
1379 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1380 return -1; /* NAT client only works with IPv4 addresses */
1383 if ( (plugin->enable_nat_client == GNUNET_YES) &&
1384 (is_natd == GNUNET_YES) &&
1385 (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns,
1386 &target->hashPubKey)) )
1389 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1391 _("Found valid IPv4 NAT address (creating session)!\n"));
1393 session = create_session (plugin,
1398 /* create new message entry */
1399 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1400 /* FIXME: the memset of this malloc can be up to 2% of our total runtime */
1401 pm->msg = (const char*) &pm[1];
1402 memcpy (&pm[1], msg, msgbuf_size);
1403 /* FIXME: this memcpy can be up to 7% of our total run-time
1404 (for transport service) */
1405 pm->message_size = msgbuf_size;
1406 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1407 pm->transmit_cont = cont;
1408 pm->transmit_cont_cls = cont_cls;
1410 /* append pm to pending_messages list */
1411 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1412 session->pending_messages_tail,
1413 session->pending_messages_tail,
1416 GNUNET_assert(GNUNET_CONTAINER_multihashmap_put(plugin->nat_wait_conns,
1417 &target->hashPubKey,
1419 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY) == GNUNET_OK);
1421 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1423 "Created NAT WAIT connection to `%4s' at `%s'\n",
1424 GNUNET_i2s (target),
1425 GNUNET_a2s (sb, sbs));
1427 run_gnunet_nat_client (plugin, &a4);
1430 if ( (plugin->enable_nat_client == GNUNET_YES) &&
1431 (is_natd == GNUNET_YES) &&
1432 (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns,
1433 &target->hashPubKey)) )
1435 /* Only do one NAT punch attempt per peer identity */
1438 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1442 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1444 "Failed to create connection to `%4s' at `%s'\n",
1445 GNUNET_i2s (target),
1446 GNUNET_a2s (sb, sbs));
1448 GNUNET_STATISTICS_update (plugin->env->stats,
1449 gettext_noop ("# bytes discarded by TCP (failed to connect)"),
1455 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1457 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1458 GNUNET_i2s (target),
1459 GNUNET_a2s (sb, sbs));
1461 session = create_session (plugin,
1463 GNUNET_SERVER_connect_socket (plugin->server,
1466 session->connect_addr = GNUNET_malloc (addrlen);
1467 memcpy (session->connect_addr,
1470 session->connect_alen = addrlen;
1472 GNUNET_assert (session != NULL);
1473 GNUNET_assert (session->client != NULL);
1474 GNUNET_STATISTICS_update (plugin->env->stats,
1475 gettext_noop ("# bytes currently in TCP buffers"),
1478 /* create new message entry */
1479 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1480 pm->msg = (const char*) &pm[1];
1481 memcpy (&pm[1], msg, msgbuf_size);
1482 pm->message_size = msgbuf_size;
1483 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1484 pm->transmit_cont = cont;
1485 pm->transmit_cont_cls = cont_cls;
1487 /* append pm to pending_messages list */
1488 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1489 session->pending_messages_tail,
1490 session->pending_messages_tail,
1493 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1495 "Asked to transmit %u bytes to `%s', added message to list.\n",
1497 GNUNET_i2s (target));
1499 process_pending_messages (session);
1505 * Function that can be called to force a disconnect from the
1506 * specified neighbour. This should also cancel all previously
1507 * scheduled transmissions. Obviously the transmission may have been
1508 * partially completed already, which is OK. The plugin is supposed
1509 * to close the connection (if applicable) and no longer call the
1510 * transmit continuation(s).
1512 * Finally, plugin MUST NOT call the services's receive function to
1513 * notify the service that the connection to the specified target was
1514 * closed after a getting this call.
1516 * @param cls closure
1517 * @param target peer for which the last transmission is
1521 tcp_plugin_disconnect (void *cls,
1522 const struct GNUNET_PeerIdentity *target)
1524 struct Plugin *plugin = cls;
1525 struct Session *session;
1526 struct Session *next;
1527 struct PendingMessage *pm;
1530 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1532 "Asked to cancel session with `%4s'\n",
1533 GNUNET_i2s (target));
1535 next = plugin->sessions;
1536 while (NULL != (session = next))
1538 next = session->next;
1539 if (0 != memcmp (target,
1541 sizeof (struct GNUNET_PeerIdentity)))
1543 pm = session->pending_messages_head;
1546 pm->transmit_cont = NULL;
1547 pm->transmit_cont_cls = NULL;
1550 GNUNET_STATISTICS_update (session->plugin->env->stats,
1551 gettext_noop ("# transport-service disconnect requests for TCP"),
1554 disconnect_session (session);
1560 * Context for address to string conversion.
1562 struct PrettyPrinterContext
1565 * Function to call with the result.
1567 GNUNET_TRANSPORT_AddressStringCallback asc;
1570 * Clsoure for 'asc'.
1575 * Port to add after the IP address.
1582 * Append our port and forward the result.
1584 * @param cls the 'struct PrettyPrinterContext*'
1585 * @param hostname hostname part of the address
1588 append_port (void *cls, const char *hostname)
1590 struct PrettyPrinterContext *ppc = cls;
1593 if (hostname == NULL)
1595 ppc->asc (ppc->asc_cls, NULL);
1599 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1600 ppc->asc (ppc->asc_cls, ret);
1606 * Convert the transports address to a nice, human-readable
1609 * @param cls closure
1610 * @param type name of the transport that generated the address
1611 * @param addr one of the addresses of the host, NULL for the last address
1612 * the specific address format depends on the transport
1613 * @param addrlen length of the address
1614 * @param numeric should (IP) addresses be displayed in numeric form?
1615 * @param timeout after how long should we give up?
1616 * @param asc function to call on each string
1617 * @param asc_cls closure for asc
1620 tcp_plugin_address_pretty_printer (void *cls,
1625 struct GNUNET_TIME_Relative timeout,
1626 GNUNET_TRANSPORT_AddressStringCallback asc,
1629 struct Plugin *plugin = cls;
1630 struct PrettyPrinterContext *ppc;
1633 struct sockaddr_in a4;
1634 struct sockaddr_in6 a6;
1635 const struct IPv4TcpAddress *t4;
1636 const struct IPv6TcpAddress *t6;
1639 if (addrlen == sizeof (struct IPv6TcpAddress))
1642 memset (&a6, 0, sizeof (a6));
1643 a6.sin6_family = AF_INET6;
1644 a6.sin6_port = t6->t6_port;
1645 memcpy (&a6.sin6_addr,
1647 sizeof (struct in6_addr));
1648 port = ntohs (t6->t6_port);
1652 else if (addrlen == sizeof (struct IPv4TcpAddress))
1655 memset (&a4, 0, sizeof (a4));
1656 a4.sin_family = AF_INET;
1657 a4.sin_port = t4->t_port;
1658 a4.sin_addr.s_addr = t4->ipv4_addr;
1659 port = ntohs (t4->t_port);
1665 /* invalid address */
1666 GNUNET_break_op (0);
1667 asc (asc_cls, NULL);
1670 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1672 ppc->asc_cls = asc_cls;
1674 GNUNET_RESOLVER_hostname_get (plugin->env->cfg,
1677 !numeric, timeout, &append_port, ppc);
1682 * Check if the given port is plausible (must be either our listen
1683 * port or our advertised port), or any port if we are behind NAT
1684 * and do not have a port open. If it is neither, we return
1687 * @param plugin global variables
1688 * @param in_port port number to check
1689 * @return GNUNET_OK if port is either open_port or adv_port
1692 check_port (struct Plugin *plugin,
1695 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1697 return GNUNET_SYSERR;
1702 * Function that will be called to check if a binary address for this
1703 * plugin is well-formed and corresponds to an address for THIS peer
1704 * (as per our configuration). Naturally, if absolutely necessary,
1705 * plugins can be a bit conservative in their answer, but in general
1706 * plugins should make sure that the address does not redirect
1707 * traffic to a 3rd party that might try to man-in-the-middle our
1710 * @param cls closure, our 'struct Plugin*'
1711 * @param addr pointer to the address
1712 * @param addrlen length of addr
1713 * @return GNUNET_OK if this is a plausible address for this peer
1714 * and transport, GNUNET_SYSERR if not
1717 tcp_plugin_check_address (void *cls,
1721 struct Plugin *plugin = cls;
1722 struct IPv4TcpAddress *v4;
1723 struct IPv6TcpAddress *v6;
1725 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1726 (addrlen != sizeof (struct IPv6TcpAddress)))
1728 GNUNET_break_op (0);
1729 return GNUNET_SYSERR;
1731 if (addrlen == sizeof (struct IPv4TcpAddress))
1733 v4 = (struct IPv4TcpAddress *) addr;
1735 check_mapped_addr (plugin, v4, sizeof (struct IPv4TcpAddress)))
1738 check_port (plugin, ntohs (v4->t_port)))
1739 return GNUNET_SYSERR;
1741 check_local_addr (plugin, &v4->ipv4_addr, sizeof (struct in_addr)))
1742 return GNUNET_SYSERR;
1746 v6 = (struct IPv6TcpAddress *) addr;
1747 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1749 GNUNET_break_op (0);
1750 return GNUNET_SYSERR;
1753 check_mapped_addr (plugin, v6, sizeof (struct IPv6TcpAddress)))
1756 check_port (plugin, ntohs (v6->t6_port)))
1757 return GNUNET_SYSERR;
1759 check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
1760 return GNUNET_SYSERR;
1767 * We've received a nat probe from this peer via TCP. Finish
1768 * creating the client session and resume sending of queued
1771 * @param cls closure
1772 * @param client identification of the client
1773 * @param message the actual message
1776 handle_tcp_nat_probe (void *cls,
1777 struct GNUNET_SERVER_Client *client,
1778 const struct GNUNET_MessageHeader *message)
1780 struct Plugin *plugin = cls;
1781 struct Session *session;
1782 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1785 struct IPv4TcpAddress *t4;
1786 struct IPv6TcpAddress *t6;
1787 const struct sockaddr_in *s4;
1788 const struct sockaddr_in6 *s6;
1791 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1793 "received tcp NAT probe\n");
1795 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1796 * a connection to this peer by running gnunet-nat-client. This peer
1797 * received the punch message and now wants us to use the new connection
1798 * as the default for that peer. Do so and then send a WELCOME message
1799 * so we can really be connected!
1801 if (ntohs(message->size) != sizeof(struct TCP_NAT_ProbeMessage))
1806 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *)message;
1807 session = GNUNET_CONTAINER_multihashmap_get(plugin->nat_wait_conns,
1808 &tcp_nat_probe->clientIdentity.hashPubKey);
1809 if (session == NULL)
1812 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1814 "Did NOT find session for NAT probe!\n");
1816 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1820 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1822 "Found session for NAT probe!\n");
1824 GNUNET_assert(GNUNET_CONTAINER_multihashmap_remove(plugin->nat_wait_conns,
1825 &tcp_nat_probe->clientIdentity.hashPubKey,
1826 session) == GNUNET_YES);
1828 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1831 GNUNET_free (session);
1832 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1836 GNUNET_SERVER_client_keep (client);
1837 session->client = client;
1838 session->last_activity = GNUNET_TIME_absolute_get ();
1839 session->inbound = GNUNET_NO;
1842 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1844 "Found address `%s' for incoming connection\n",
1845 GNUNET_a2s (vaddr, alen));
1847 switch (((const struct sockaddr *)vaddr)->sa_family)
1851 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1852 t4->t_port = s4->sin_port;
1853 t4->ipv4_addr = s4->sin_addr.s_addr;
1854 session->connect_addr = t4;
1855 session->connect_alen = sizeof (struct IPv4TcpAddress);
1859 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1860 t6->t6_port = s6->sin6_port;
1861 memcpy (&t6->ipv6_addr,
1863 sizeof (struct in6_addr));
1864 session->connect_addr = t6;
1865 session->connect_alen = sizeof (struct IPv6TcpAddress);
1868 GNUNET_break_op (0);
1870 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1872 "Bad address for incoming connection!\n");
1874 GNUNET_free (vaddr);
1875 GNUNET_SERVER_client_drop (client);
1876 GNUNET_free (session);
1877 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1880 GNUNET_free (vaddr);
1882 session->next = plugin->sessions;
1883 plugin->sessions = session;
1884 GNUNET_STATISTICS_update (plugin->env->stats,
1885 gettext_noop ("# TCP sessions active"),
1888 process_pending_messages (session);
1889 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1894 * We've received a welcome from this peer via TCP. Possibly create a
1895 * fresh client record and send back our welcome.
1897 * @param cls closure
1898 * @param client identification of the client
1899 * @param message the actual message
1902 handle_tcp_welcome (void *cls,
1903 struct GNUNET_SERVER_Client *client,
1904 const struct GNUNET_MessageHeader *message)
1906 struct Plugin *plugin = cls;
1907 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
1908 struct Session *session;
1911 struct IPv4TcpAddress *t4;
1912 struct IPv6TcpAddress *t6;
1913 const struct sockaddr_in *s4;
1914 const struct sockaddr_in6 *s6;
1917 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1919 "Received %s message from `%4s'.\n",
1921 GNUNET_i2s (&wm->clientIdentity));
1923 GNUNET_STATISTICS_update (plugin->env->stats,
1924 gettext_noop ("# TCP WELCOME messages received"),
1927 session = find_session_by_client (plugin, client);
1929 if (session == NULL)
1932 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1934 "Received %s message from a `%4s', creating new session\n",
1936 GNUNET_i2s (&wm->clientIdentity));
1938 GNUNET_SERVER_client_keep (client);
1939 session = create_session (plugin,
1940 &wm->clientIdentity,
1943 session->inbound = GNUNET_YES;
1945 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1948 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1950 "Found address `%s' for incoming connection\n",
1951 GNUNET_a2s (vaddr, alen));
1953 if (alen == sizeof (struct sockaddr_in))
1956 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1957 t4->t_port = s4->sin_port;
1958 t4->ipv4_addr = s4->sin_addr.s_addr;
1959 session->connect_addr = t4;
1960 session->connect_alen = sizeof (struct IPv4TcpAddress);
1962 else if (alen == sizeof (struct sockaddr_in6))
1965 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1966 t6->t6_port = s6->sin6_port;
1967 memcpy (&t6->ipv6_addr,
1969 sizeof (struct in6_addr));
1970 session->connect_addr = t6;
1971 session->connect_alen = sizeof (struct IPv6TcpAddress);
1974 GNUNET_free (vaddr);
1979 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1981 "Did not obtain TCP socket address for incoming connection\n");
1984 process_pending_messages (session);
1990 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1992 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1994 "Found address `%s' (already have session)\n",
1995 GNUNET_a2s (vaddr, alen));
2000 if (session->expecting_welcome != GNUNET_YES)
2002 GNUNET_break_op (0);
2003 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2006 session->last_activity = GNUNET_TIME_absolute_get ();
2007 session->expecting_welcome = GNUNET_NO;
2008 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2013 * Task to signal the server that we can continue
2014 * receiving from the TCP client now.
2016 * @param cls the 'struct Session*'
2017 * @param tc task context (unused)
2020 delayed_done (void *cls,
2021 const struct GNUNET_SCHEDULER_TaskContext *tc)
2023 struct Session *session = cls;
2024 struct GNUNET_TIME_Relative delay;
2026 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
2027 delay = session->plugin->env->receive (session->plugin->env->cls,
2033 if (delay.rel_value == 0)
2034 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
2036 session->receive_delay_task =
2037 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2042 * We've received data for this peer via TCP. Unbox,
2043 * compute latency and forward.
2045 * @param cls closure
2046 * @param client identification of the client
2047 * @param message the actual message
2050 handle_tcp_data (void *cls,
2051 struct GNUNET_SERVER_Client *client,
2052 const struct GNUNET_MessageHeader *message)
2054 struct Plugin *plugin = cls;
2055 struct Session *session;
2056 struct GNUNET_TIME_Relative delay;
2059 type = ntohs (message->type);
2060 if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2061 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
2063 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2064 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2067 session = find_session_by_client (plugin, client);
2068 if ( (NULL == session) || (GNUNET_YES == session->expecting_welcome) )
2070 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2073 session->last_activity = GNUNET_TIME_absolute_get ();
2075 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2077 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2078 (unsigned int) ntohs (message->size),
2079 (unsigned int) ntohs (message->type),
2080 GNUNET_i2s (&session->target));
2082 GNUNET_STATISTICS_update (plugin->env->stats,
2083 gettext_noop ("# bytes received via TCP"),
2084 ntohs (message->size),
2086 struct GNUNET_TRANSPORT_ATS_Information distance[2];
2087 distance[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2088 distance[0].value = htonl (1);
2089 distance[1].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2090 distance[1].value = htonl (0);
2091 delay = plugin->env->receive (plugin->env->cls, &session->target, message,
2092 (const struct GNUNET_TRANSPORT_ATS_Information *) &distance,
2095 (GNUNET_YES == session->inbound) ? NULL : session->connect_addr,
2096 (GNUNET_YES == session->inbound) ? 0 : session->connect_alen);
2097 if (delay.rel_value == 0)
2098 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2100 session->receive_delay_task =
2101 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2106 * Functions with this signature are called whenever a peer
2107 * is disconnected on the network level.
2109 * @param cls closure
2110 * @param client identification of the client
2113 disconnect_notify (void *cls,
2114 struct GNUNET_SERVER_Client *client)
2116 struct Plugin *plugin = cls;
2117 struct Session *session;
2121 session = find_session_by_client (plugin, client);
2122 if (session == NULL)
2123 return; /* unknown, nothing to do */
2125 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2127 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2128 GNUNET_i2s (&session->target),
2129 (session->connect_addr != NULL) ?
2130 tcp_address_to_string (session->plugin,
2131 session->connect_addr,
2132 session->connect_alen) : "*");
2134 GNUNET_STATISTICS_update (session->plugin->env->stats,
2135 gettext_noop ("# network-level TCP disconnect events"),
2138 disconnect_session (session);
2143 * Add the IP of our network interface to the list of
2144 * our internal IP addresses.
2146 * @param cls the 'struct Plugin*'
2147 * @param name name of the interface
2148 * @param isDefault do we think this may be our default interface
2149 * @param addr address of the interface
2150 * @param addrlen number of bytes in addr
2151 * @return GNUNET_OK to continue iterating
2154 process_interfaces (void *cls,
2157 const struct sockaddr *addr, socklen_t addrlen)
2159 struct Plugin *plugin = cls;
2161 struct IPv4TcpAddress t4;
2162 struct IPv6TcpAddress t6;
2163 struct IPv4TcpAddress t4_nat;
2164 struct IPv6TcpAddress t6_nat;
2168 char buf[INET6_ADDRSTRLEN];
2170 af = addr->sa_family;
2175 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
2176 GNUNET_assert (NULL != inet_ntop(AF_INET,
2180 if ( (plugin->bind_address != NULL) &&
2181 (0 != strcmp(buf, plugin->bind_address)) )
2184 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2186 "Not notifying transport of address `%s' (does not match bind address)\n",
2187 GNUNET_a2s (addr, addrlen));
2191 if ( (plugin->internal_address == NULL) &&
2193 plugin->internal_address = GNUNET_strdup (buf);
2194 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (struct in_addr));
2195 if (plugin->behind_nat == GNUNET_YES)
2197 /* Also advertise as NAT (with port 0) */
2198 t4_nat.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
2199 t4_nat.t_port = htons(0);
2202 t4.t_port = htons (plugin->adv_port);
2207 if ( (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr)) ||
2208 (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(plugin->env->cfg,
2212 /* skip link local addresses */
2215 memcpy (&t6.ipv6_addr,
2216 &((struct sockaddr_in6 *) addr)->sin6_addr,
2217 sizeof (struct in6_addr));
2219 /* check bind address */
2220 GNUNET_assert (NULL != inet_ntop(AF_INET6,
2225 if ( (plugin->bind_address != NULL) &&
2226 (0 != strcmp(buf, plugin->bind_address)) )
2229 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2231 "Not notifying transport of address `%s' (does not match bind address)\n",
2232 GNUNET_a2s (addr, addrlen));
2237 add_to_address_list (plugin,
2239 sizeof (struct in6_addr));
2240 if (plugin->behind_nat == GNUNET_YES)
2242 /* Also advertise as NAT (with port 0) */
2243 memcpy (&t6_nat.ipv6_addr,
2244 &((struct sockaddr_in6 *) addr)->sin6_addr,
2245 sizeof (struct in6_addr));
2246 t6_nat.t6_port = htons(0);
2249 t6.t6_port = htons (plugin->adv_port);
2258 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2260 "Found address `%s' (%s) len %d\n",
2261 GNUNET_a2s (addr, addrlen), name, args);
2263 plugin->env->notify_address (plugin->env->cls,
2265 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
2267 if (arg_nat != NULL)
2269 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2271 _("Found address `%s' (%s) len %d\n"),
2272 GNUNET_a2s (addr, addrlen), name, args);
2273 plugin->env->notify_address (plugin->env->cls,
2275 arg_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
2283 * Function called by the resolver for each address obtained from DNS
2284 * for our own hostname. Add the addresses to the list of our
2285 * external IP addresses.
2287 * @param cls closure
2288 * @param addr one of the addresses of the host, NULL for the last address
2289 * @param addrlen length of the address
2292 process_hostname_ips (void *cls,
2293 const struct sockaddr *addr, socklen_t addrlen)
2295 struct Plugin *plugin = cls;
2299 plugin->hostname_dns = NULL;
2302 /* FIXME: Can we figure out our external address here so it doesn't need to be user specified? */
2303 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
2308 * We can now send a probe message, copy into buffer to really send.
2310 * @param cls closure, a struct TCPProbeContext
2311 * @param size max size to copy
2312 * @param buf buffer to copy message to
2313 * @return number of bytes copied into buf
2316 notify_send_probe (void *cls,
2320 struct TCPProbeContext *tcp_probe_ctx = cls;
2321 struct Plugin *plugin = tcp_probe_ctx->plugin;
2324 tcp_probe_ctx->transmit_handle = NULL;
2325 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
2330 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock, GNUNET_NO);
2331 GNUNET_free(tcp_probe_ctx);
2334 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2335 memcpy(buf, &tcp_probe_ctx->message, sizeof(tcp_probe_ctx->message));
2336 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2337 tcp_probe_ctx->sock);
2338 ret = sizeof(tcp_probe_ctx->message);
2339 GNUNET_free(tcp_probe_ctx);
2345 * We have been notified that gnunet-nat-server has written something to stdout.
2346 * Handle the output, then reschedule this function to be called again once
2347 * more is available.
2349 * @param cls the plugin handle
2350 * @param tc the scheduling context
2353 tcp_plugin_server_read (void *cls,
2354 const struct GNUNET_SCHEDULER_TaskContext *tc)
2356 struct Plugin *plugin = cls;
2361 const char *port_start;
2362 struct sockaddr_in sin_addr;
2363 struct TCPProbeContext *tcp_probe_ctx;
2364 struct GNUNET_CONNECTION_Handle *sock;
2366 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
2368 memset (mybuf, 0, sizeof(mybuf));
2369 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle,
2375 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2377 "Finished reading from server stdout with code: %d\n",
2380 /* FIXME: consider process_wait here? */
2385 for (i = 0; i < sizeof(mybuf); i++)
2387 if (mybuf[i] == '\n')
2392 if ( (mybuf[i] == ':') && (i + 1 < sizeof(mybuf)) )
2395 port_start = &mybuf[i + 1];
2399 /* construct socket address of sender */
2400 memset (&sin_addr, 0, sizeof (sin_addr));
2401 sin_addr.sin_family = AF_INET;
2402 #if HAVE_SOCKADDR_IN_SIN_LEN
2403 sin_addr.sin_len = sizeof (sin_addr);
2405 if ( (NULL == port_start) ||
2406 (1 != sscanf (port_start, "%d", &port)) ||
2407 (-1 == inet_pton(AF_INET, mybuf, &sin_addr.sin_addr)) )
2409 /* should we restart gnunet-nat-server? */
2410 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2412 _("gnunet-nat-server generated malformed address `%s'\n"),
2414 plugin->server_read_task
2415 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2416 plugin->server_stdout_handle,
2417 &tcp_plugin_server_read,
2421 sin_addr.sin_port = htons((uint16_t) port);
2423 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2425 "gnunet-nat-server read: %s:%d\n",
2430 * We have received an ICMP response, ostensibly from a peer
2431 * that wants to connect to us! Send a message to establish a connection.
2433 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET,
2434 (const struct sockaddr *)&sin_addr,
2438 /* failed for some odd reason (out of sockets?); ignore attempt */
2439 plugin->server_read_task =
2440 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2441 plugin->server_stdout_handle,
2442 &tcp_plugin_server_read,
2447 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2448 "Sending TCP probe message to `%s:%u'!\n",
2450 (unsigned int) port);
2451 /* FIXME: do we need to track these probe context objects so that
2452 we can clean them up on plugin unload? */
2454 = GNUNET_malloc(sizeof(struct TCPProbeContext));
2455 tcp_probe_ctx->message.header.size
2456 = htons(sizeof(struct TCP_NAT_ProbeMessage));
2457 tcp_probe_ctx->message.header.type
2458 = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2459 memcpy (&tcp_probe_ctx->message.clientIdentity,
2460 plugin->env->my_identity,
2461 sizeof(struct GNUNET_PeerIdentity));
2462 tcp_probe_ctx->plugin = plugin;
2463 tcp_probe_ctx->sock = sock;
2464 GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
2467 tcp_probe_ctx->transmit_handle
2468 = GNUNET_CONNECTION_notify_transmit_ready (sock,
2469 ntohs (tcp_probe_ctx->message.header.size),
2470 GNUNET_TIME_UNIT_FOREVER_REL,
2471 ¬ify_send_probe, tcp_probe_ctx);
2473 plugin->server_read_task =
2474 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2475 plugin->server_stdout_handle,
2476 &tcp_plugin_server_read,
2482 * Start the gnunet-nat-server process for users behind NAT.
2484 * @param plugin the transport plugin
2485 * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
2488 tcp_transport_start_nat_server (struct Plugin *plugin)
2490 if (plugin->internal_address == NULL)
2491 return GNUNET_SYSERR;
2492 plugin->server_stdout = GNUNET_DISK_pipe (GNUNET_YES,
2495 if (plugin->server_stdout == NULL)
2496 return GNUNET_SYSERR;
2498 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2501 "gnunet-nat-server",
2502 plugin->internal_address);
2504 /* Start the server process */
2505 plugin->server_proc = GNUNET_OS_start_process (NULL,
2506 plugin->server_stdout,
2507 "gnunet-nat-server",
2508 "gnunet-nat-server",
2509 plugin->internal_address,
2511 if (plugin->server_proc == NULL)
2513 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2515 _("Failed to start %s\n"),
2516 "gnunet-nat-server");
2517 GNUNET_DISK_pipe_close (plugin->server_stdout);
2518 plugin->server_stdout = NULL;
2519 return GNUNET_SYSERR;
2521 /* Close the write end of the read pipe */
2522 GNUNET_DISK_pipe_close_end(plugin->server_stdout,
2523 GNUNET_DISK_PIPE_END_WRITE);
2524 plugin->server_stdout_handle
2525 = GNUNET_DISK_pipe_handle (plugin->server_stdout,
2526 GNUNET_DISK_PIPE_END_READ);
2527 plugin->server_read_task
2528 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2529 plugin->server_stdout_handle,
2530 &tcp_plugin_server_read,
2537 * Return the actual path to a file found in the current
2538 * PATH environment variable.
2540 * @param binary the name of the file to find
2541 * @return path to binary, NULL if not found
2544 get_path_from_PATH (const char *binary)
2552 p = getenv ("PATH");
2555 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2557 _("PATH environment variable is unset.\n"));
2560 path = GNUNET_strdup (p); /* because we write on it */
2561 buf = GNUNET_malloc (strlen (path) + 20);
2564 while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
2567 sprintf (buf, "%s/%s", pos, binary);
2568 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2575 sprintf (buf, "%s/%s", pos, binary);
2576 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2588 * Check whether the suid bit is set on a file.
2589 * Attempts to find the file using the current
2590 * PATH environment variable as a search path.
2592 * @param binary the name of the file to check
2593 * @return GNUNET_YES if the file is SUID,
2595 * GNUNET_SYSERR on error
2598 check_gnunet_nat_binary (const char *binary)
2600 struct stat statbuf;
2606 GNUNET_asprintf (&binaryexe, "%s.exe", binary);
2607 p = get_path_from_PATH (binaryexe);
2610 p = get_path_from_PATH (binary);
2614 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2616 _("Could not find binary `%s' in PATH!\n"),
2620 if (0 != STAT (p, &statbuf))
2622 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2623 _("stat (%s) failed: %s\n"),
2627 return GNUNET_SYSERR;
2631 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
2632 (statbuf.st_uid == 0) )
2636 rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
2637 if (INVALID_SOCKET == rawsock)
2639 DWORD err = GetLastError ();
2640 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2642 "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) failed! GLE = %d\n", err);
2643 return GNUNET_NO; /* not running as administrator */
2645 closesocket (rawsock);
2652 * Our (external) hostname was resolved.
2654 * @param cls the 'struct Plugin'
2655 * @param addr NULL on error, otherwise result of DNS lookup
2656 * @param addrlen number of bytes in addr
2659 process_external_ip (void *cls,
2660 const struct sockaddr *addr,
2663 struct Plugin *plugin = cls;
2664 const struct sockaddr_in *s;
2665 struct IPv4TcpAddress t4;
2668 plugin->ext_dns = NULL;
2671 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
2672 s = (const struct sockaddr_in *) addr;
2673 t4.ipv4_addr = s->sin_addr.s_addr;
2674 if ( (plugin->behind_nat == GNUNET_YES) &&
2675 (plugin->enable_nat_server == GNUNET_YES) )
2677 t4.t_port = htons(0);
2678 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2680 "Notifying transport of address %s:%d\n",
2681 plugin->external_address,
2686 t4.t_port = htons(plugin->adv_port);
2687 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2689 "Notifying transport of address %s:%d\n",
2690 plugin->external_address,
2691 (int) plugin->adv_port);
2693 add_to_address_list (plugin,
2695 sizeof (struct in_addr));
2696 plugin->env->notify_address (plugin->env->cls,
2699 GNUNET_TIME_UNIT_FOREVER_REL);
2704 * Entry point for the plugin.
2706 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2707 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2710 libgnunet_plugin_transport_tcp_init (void *cls)
2712 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2713 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2714 sizeof (struct WelcomeMessage)},
2715 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE, sizeof (struct TCP_NAT_ProbeMessage)},
2716 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2719 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2720 struct GNUNET_TRANSPORT_PluginFunctions *api;
2721 struct Plugin *plugin;
2722 struct GNUNET_SERVICE_Context *service;
2723 unsigned long long aport;
2724 unsigned long long bport;
2728 int enable_nat_client;
2729 int enable_nat_server;
2731 char *internal_address;
2732 char *external_address;
2734 struct sockaddr_in in_addr;
2735 struct GNUNET_TIME_Relative idle_timeout;
2737 behind_nat = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2740 nat_punched = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2743 enable_nat_client = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2745 "ENABLE_NAT_CLIENT");
2746 enable_nat_server = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2748 "ENABLE_NAT_SERVER");
2749 enable_upnp = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2753 if ( (GNUNET_YES == enable_nat_server) &&
2754 (GNUNET_YES != check_gnunet_nat_binary("gnunet-nat-server")) )
2756 enable_nat_server = GNUNET_NO;
2757 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2758 _("Configuration requires `%s', but binary is not installed properly (SUID bit not set). Option disabled.\n"),
2759 "gnunet-nat-server");
2762 if ( (GNUNET_YES == enable_nat_client) &&
2763 (GNUNET_YES != check_gnunet_nat_binary("gnunet-nat-client")) )
2765 enable_nat_client = GNUNET_NO;
2766 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2767 _("Configuration requires `%s', but binary is not installed properly (SUID bit not set). Option disabled.\n"),
2768 "gnunet-nat-client");
2771 external_address = NULL;
2773 GNUNET_CONFIGURATION_have_value (env->cfg,
2775 "EXTERNAL_ADDRESS"))
2777 (void) GNUNET_CONFIGURATION_get_value_string (env->cfg,
2783 if ( (external_address != NULL) &&
2784 (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1) )
2787 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2789 _("Malformed %s `%s' given in configuration!\n"),
2794 if ( (external_address == NULL) &&
2795 (nat_punched == GNUNET_YES) )
2797 nat_punched = GNUNET_NO;
2798 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2799 _("Configuration says NAT was punched, but `%s' is not given. Option ignored.\n"),
2800 "EXTERNAL_ADDRESS");
2803 if (GNUNET_YES == nat_punched)
2805 enable_nat_server = GNUNET_NO;
2806 enable_upnp = GNUNET_NO;
2809 bind_address = NULL;
2810 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (env->cfg,
2815 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2817 _("Binding TCP plugin to specific address: `%s'\n"),
2821 internal_address = NULL;
2823 GNUNET_CONFIGURATION_have_value (env->cfg,
2825 "INTERNAL_ADDRESS"))
2827 (void) GNUNET_CONFIGURATION_get_value_string (env->cfg,
2833 if ( (internal_address != NULL) &&
2834 (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1) )
2836 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2838 _("Malformed %s `%s' given in configuration!\n"),
2841 GNUNET_free_non_null(internal_address);
2842 GNUNET_free_non_null(external_address);
2846 if ((bind_address != NULL) && (internal_address != NULL))
2848 if (0 != strcmp(internal_address, bind_address ))
2850 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2851 "tcp","Specific bind address `%s' and internal address `%s' must not differ, forcing internal address to bind address!\n", bind_address, internal_address);
2852 GNUNET_free (internal_address);
2853 internal_address = bind_address;
2854 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2855 "tcp","New internal address `%s'\n", internal_address);
2861 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2867 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2873 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2875 _("Require valid port number for service `%s' in configuration!\n"),
2877 GNUNET_free_non_null(external_address);
2878 GNUNET_free_non_null(internal_address);
2889 service = GNUNET_SERVICE_start ("transport-tcp", env->cfg);
2890 if (service == NULL)
2892 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2894 _("Failed to start service.\n"));
2901 plugin = GNUNET_malloc (sizeof (struct Plugin));
2902 plugin->open_port = bport;
2903 plugin->adv_port = aport;
2904 plugin->bind_address = bind_address;
2905 plugin->external_address = external_address;
2906 plugin->internal_address = internal_address;
2907 plugin->behind_nat = behind_nat;
2908 plugin->nat_punched = nat_punched;
2909 plugin->enable_nat_client = enable_nat_client;
2910 plugin->enable_nat_server = enable_nat_server;
2911 plugin->enable_upnp = enable_upnp;
2913 plugin->lsock = NULL;
2914 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2916 api->send = &tcp_plugin_send;
2917 api->disconnect = &tcp_plugin_disconnect;
2918 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2919 api->check_address = &tcp_plugin_check_address;
2920 api->address_to_string = &tcp_address_to_string;
2921 plugin->service = service;
2922 if (service != NULL)
2924 plugin->server = GNUNET_SERVICE_get_server (service);
2929 GNUNET_CONFIGURATION_get_value_time (env->cfg,
2934 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2936 _("Failed to find option %s in section %s!\n"),
2939 GNUNET_free_non_null(external_address);
2940 GNUNET_free_non_null(internal_address);
2944 plugin->server = GNUNET_SERVER_create_with_sockets (NULL, NULL, NULL,
2945 idle_timeout, GNUNET_YES);
2947 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2948 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2950 i < sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2952 plugin->handlers[i].callback_cls = plugin;
2953 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2954 GNUNET_SERVER_disconnect_notify (plugin->server,
2957 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2959 if ( (plugin->behind_nat == GNUNET_YES) &&
2960 (plugin->enable_nat_server == GNUNET_YES) &&
2961 (GNUNET_YES != tcp_transport_start_nat_server(plugin)) )
2963 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2965 _("Failed to start %s required for NAT in %s!\n"),
2968 GNUNET_free_non_null(external_address);
2969 GNUNET_free_non_null(internal_address);
2970 if (service != NULL)
2971 GNUNET_SERVICE_stop (service);
2973 GNUNET_SERVER_destroy (plugin->server);
2978 if (enable_nat_client == GNUNET_YES)
2980 plugin->nat_wait_conns = GNUNET_CONTAINER_multihashmap_create(16);
2981 GNUNET_assert (plugin->nat_wait_conns != NULL);
2985 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2987 _("TCP transport listening on port %llu\n"),
2990 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2992 _("TCP transport not listening on any port (client only)\n"));
2994 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2996 _("TCP transport advertises itself as being on port %llu\n"),
2999 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->cfg,
3001 HOSTNAME_RESOLVE_TIMEOUT,
3002 &process_hostname_ips,
3005 if (plugin->external_address != NULL)
3007 plugin->ext_dns = GNUNET_RESOLVER_ip_get (env->cfg,
3008 plugin->external_address,
3010 GNUNET_TIME_UNIT_MINUTES,
3011 &process_external_ip,
3019 * Exit point from the plugin.
3022 libgnunet_plugin_transport_tcp_done (void *cls)
3024 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3025 struct Plugin *plugin = api->cls;
3026 struct Session *session;
3027 struct LocalAddrList *lal;
3028 struct TCPProbeContext *tcp_probe;
3030 if (plugin->ext_dns != NULL)
3032 GNUNET_RESOLVER_request_cancel (plugin->ext_dns);
3033 plugin->ext_dns = NULL;
3035 while (NULL != (session = plugin->sessions))
3036 disconnect_session (session);
3037 if (NULL != plugin->hostname_dns)
3039 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
3040 plugin->hostname_dns = NULL;
3042 if (plugin->service != NULL)
3043 GNUNET_SERVICE_stop (plugin->service);
3045 GNUNET_SERVER_destroy (plugin->server);
3046 GNUNET_free (plugin->handlers);
3047 while (NULL != (lal = plugin->lal_head))
3049 GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
3052 if (lal->nat != NULL)
3053 GNUNET_NAT_unregister (lal->nat);
3054 GNUNET_free_non_null (lal->external_nat_address);
3057 while (NULL != (tcp_probe = plugin->probe_head))
3059 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
3062 GNUNET_CONNECTION_destroy (tcp_probe->sock, GNUNET_NO);
3063 GNUNET_free (tcp_probe);
3066 if ((plugin->behind_nat == GNUNET_YES) &&
3067 (plugin->enable_nat_server == GNUNET_YES))
3069 if (0 != GNUNET_OS_process_kill (plugin->server_proc, SIGTERM))
3070 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
3071 GNUNET_OS_process_wait (plugin->server_proc);
3072 GNUNET_OS_process_close (plugin->server_proc);
3073 plugin->server_proc = NULL;
3075 GNUNET_free_non_null(plugin->bind_address);
3076 GNUNET_free (plugin);
3081 /* end of plugin_transport_tcp.c */