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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18 Boston, MA 02111-1307, USA.
21 * @file transport/plugin_transport_tcp.c
22 * @brief Implementation of the TCP transport service
23 * @author Christian Grothoff
26 #include "gnunet_hello_lib.h"
27 #include "gnunet_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_NO
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 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 addr 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,
1198 /* we know that the gnunet-nat-client will terminate virtually
1200 GNUNET_OS_process_wait (proc);
1201 GNUNET_OS_process_close (proc);
1206 * Function that can be used by the transport service to transmit
1207 * a message using the plugin. Note that in the case of a
1208 * peer disconnecting, the continuation MUST be called
1209 * prior to the disconnect notification itself. This function
1210 * will be called with this peer's HELLO message to initiate
1211 * a fresh connection to another peer.
1213 * @param cls closure
1214 * @param target who should receive this message
1215 * @param msg the message to transmit
1216 * @param msgbuf_size number of bytes in 'msg'
1217 * @param priority how important is the message (most plugins will
1218 * ignore message priority and just FIFO)
1219 * @param timeout how long to wait at most for the transmission (does not
1220 * require plugins to discard the message after the timeout,
1221 * just advisory for the desired delay; most plugins will ignore
1223 * @param session which session must be used (or NULL for "any")
1224 * @param addr the address to use (can be NULL if the plugin
1225 * is "on its own" (i.e. re-use existing TCP connection))
1226 * @param addrlen length of the address in bytes
1227 * @param force_address GNUNET_YES if the plugin MUST use the given address,
1228 * GNUNET_NO means the plugin may use any other address and
1229 * GNUNET_SYSERR means that only reliable existing
1230 * bi-directional connections should be used (regardless
1232 * @param cont continuation to call once the message has
1233 * been transmitted (or if the transport is ready
1234 * for the next transmission call; or if the
1235 * peer disconnected...); can be NULL
1236 * @param cont_cls closure for cont
1237 * @return number of bytes used (on the physical network, with overheads);
1238 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1239 * and does NOT mean that the message was not transmitted (DV and NAT)
1242 tcp_plugin_send (void *cls,
1243 const struct GNUNET_PeerIdentity *target,
1247 struct GNUNET_TIME_Relative timeout,
1248 struct Session *session,
1252 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
1254 struct Plugin *plugin = cls;
1255 struct Session *cand_session;
1256 struct Session *next;
1257 struct PendingMessage *pm;
1258 struct GNUNET_CONNECTION_Handle *sa;
1262 struct sockaddr_in a4;
1263 struct sockaddr_in6 a6;
1264 const struct IPv4TcpAddress *t4;
1265 const struct IPv6TcpAddress *t6;
1266 unsigned int is_natd;
1268 GNUNET_STATISTICS_update (plugin->env->stats,
1269 gettext_noop ("# bytes TCP was asked to transmit"),
1272 /* FIXME: we could do this cheaper with a hash table
1273 where we could restrict the iteration to entries that match
1274 the target peer... */
1275 is_natd = GNUNET_NO;
1276 if (session == NULL)
1278 cand_session = NULL;
1279 next = plugin->sessions;
1280 while (NULL != (session = next))
1282 next = session->next;
1283 GNUNET_assert (session->client != NULL);
1284 if (0 != memcmp (target,
1286 sizeof (struct GNUNET_PeerIdentity)))
1288 if ( ( (GNUNET_SYSERR == force_address) &&
1289 (session->expecting_welcome == GNUNET_NO) ) ||
1290 (GNUNET_NO == force_address) )
1292 cand_session = select_better_session (cand_session,
1296 if (GNUNET_SYSERR == force_address)
1298 GNUNET_break (GNUNET_YES == force_address);
1304 if ( (addrlen != session->connect_alen) &&
1305 (session->is_nat == GNUNET_NO) )
1307 if ((0 != memcmp (session->connect_addr,
1309 addrlen)) && (session->is_nat == GNUNET_NO))
1311 cand_session = select_better_session (cand_session,
1314 session = cand_session;
1316 if ( (session == NULL) &&
1320 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1322 "Asked to transmit to `%4s' without address and I have no existing connection (failing).\n",
1323 GNUNET_i2s (target));
1325 GNUNET_STATISTICS_update (plugin->env->stats,
1326 gettext_noop ("# bytes discarded by TCP (no address and no connection)"),
1331 if (session == NULL)
1333 if (addrlen == sizeof (struct IPv6TcpAddress))
1337 memset (&a6, 0, sizeof (a6));
1338 #if HAVE_SOCKADDR_IN_SIN_LEN
1339 a6.sin6_len = sizeof (a6);
1341 a6.sin6_family = AF_INET6;
1342 a6.sin6_port = t6->t6_port;
1343 if (t6->t6_port == 0)
1344 is_natd = GNUNET_YES;
1345 memcpy (&a6.sin6_addr,
1347 sizeof (struct in6_addr));
1351 else if (addrlen == sizeof (struct IPv4TcpAddress))
1355 memset (&a4, 0, sizeof (a4));
1356 #if HAVE_SOCKADDR_IN_SIN_LEN
1357 a4.sin_len = sizeof (a4);
1359 a4.sin_family = AF_INET;
1360 a4.sin_port = t4->t_port;
1361 if (t4->t_port == 0)
1362 is_natd = GNUNET_YES;
1363 a4.sin_addr.s_addr = t4->ipv4_addr;
1369 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
1371 _("Address of unexpected length: %u\n"),
1377 if ((is_natd == GNUNET_YES) && (addrlen == sizeof (struct IPv6TcpAddress)))
1378 return -1; /* NAT client only works with IPv4 addresses */
1381 if ( (plugin->enable_nat_client == GNUNET_YES) &&
1382 (is_natd == GNUNET_YES) &&
1383 (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns,
1384 &target->hashPubKey)) )
1387 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1389 _("Found valid IPv4 NAT address (creating session)!\n"));
1391 session = create_session (plugin,
1396 /* create new message entry */
1397 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1398 /* FIXME: the memset of this malloc can be up to 2% of our total runtime */
1399 pm->msg = (const char*) &pm[1];
1400 memcpy (&pm[1], msg, msgbuf_size);
1401 /* FIXME: this memcpy can be up to 7% of our total run-time
1402 (for transport service) */
1403 pm->message_size = msgbuf_size;
1404 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1405 pm->transmit_cont = cont;
1406 pm->transmit_cont_cls = cont_cls;
1408 /* append pm to pending_messages list */
1409 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1410 session->pending_messages_tail,
1411 session->pending_messages_tail,
1414 GNUNET_assert(GNUNET_CONTAINER_multihashmap_put(plugin->nat_wait_conns,
1415 &target->hashPubKey,
1417 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY) == GNUNET_OK);
1419 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1421 "Created NAT WAIT connection to `%4s' at `%s'\n",
1422 GNUNET_i2s (target),
1423 GNUNET_a2s (sb, sbs));
1425 run_gnunet_nat_client (plugin, &a4);
1428 if ( (plugin->enable_nat_client == GNUNET_YES) &&
1429 (is_natd == GNUNET_YES) &&
1430 (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains(plugin->nat_wait_conns,
1431 &target->hashPubKey)) )
1433 /* Only do one NAT punch attempt per peer identity */
1436 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1440 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1442 "Failed to create connection to `%4s' at `%s'\n",
1443 GNUNET_i2s (target),
1444 GNUNET_a2s (sb, sbs));
1446 GNUNET_STATISTICS_update (plugin->env->stats,
1447 gettext_noop ("# bytes discarded by TCP (failed to connect)"),
1453 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1455 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1456 GNUNET_i2s (target),
1457 GNUNET_a2s (sb, sbs));
1459 session = create_session (plugin,
1461 GNUNET_SERVER_connect_socket (plugin->server,
1464 session->connect_addr = GNUNET_malloc (addrlen);
1465 memcpy (session->connect_addr,
1468 session->connect_alen = addrlen;
1470 GNUNET_assert (session != NULL);
1471 GNUNET_assert (session->client != NULL);
1472 GNUNET_STATISTICS_update (plugin->env->stats,
1473 gettext_noop ("# bytes currently in TCP buffers"),
1476 /* create new message entry */
1477 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1478 pm->msg = (const char*) &pm[1];
1479 memcpy (&pm[1], msg, msgbuf_size);
1480 pm->message_size = msgbuf_size;
1481 pm->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1482 pm->transmit_cont = cont;
1483 pm->transmit_cont_cls = cont_cls;
1485 /* append pm to pending_messages list */
1486 GNUNET_CONTAINER_DLL_insert_after (session->pending_messages_head,
1487 session->pending_messages_tail,
1488 session->pending_messages_tail,
1491 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1493 "Asked to transmit %u bytes to `%s', added message to list.\n",
1495 GNUNET_i2s (target));
1497 process_pending_messages (session);
1503 * Function that can be called to force a disconnect from the
1504 * specified neighbour. This should also cancel all previously
1505 * scheduled transmissions. Obviously the transmission may have been
1506 * partially completed already, which is OK. The plugin is supposed
1507 * to close the connection (if applicable) and no longer call the
1508 * transmit continuation(s).
1510 * Finally, plugin MUST NOT call the services's receive function to
1511 * notify the service that the connection to the specified target was
1512 * closed after a getting this call.
1514 * @param cls closure
1515 * @param target peer for which the last transmission is
1519 tcp_plugin_disconnect (void *cls,
1520 const struct GNUNET_PeerIdentity *target)
1522 struct Plugin *plugin = cls;
1523 struct Session *session;
1524 struct Session *next;
1525 struct PendingMessage *pm;
1528 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1530 "Asked to cancel session with `%4s'\n",
1531 GNUNET_i2s (target));
1533 next = plugin->sessions;
1534 while (NULL != (session = next))
1536 next = session->next;
1537 if (0 != memcmp (target,
1539 sizeof (struct GNUNET_PeerIdentity)))
1541 pm = session->pending_messages_head;
1544 pm->transmit_cont = NULL;
1545 pm->transmit_cont_cls = NULL;
1548 disconnect_session (session);
1554 * Context for address to string conversion.
1556 struct PrettyPrinterContext
1559 * Function to call with the result.
1561 GNUNET_TRANSPORT_AddressStringCallback asc;
1564 * Clsoure for 'asc'.
1569 * Port to add after the IP address.
1576 * Append our port and forward the result.
1578 * @param cls the 'struct PrettyPrinterContext*'
1579 * @param hostname hostname part of the address
1582 append_port (void *cls, const char *hostname)
1584 struct PrettyPrinterContext *ppc = cls;
1587 if (hostname == NULL)
1589 ppc->asc (ppc->asc_cls, NULL);
1593 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
1594 ppc->asc (ppc->asc_cls, ret);
1600 * Convert the transports address to a nice, human-readable
1603 * @param cls closure
1604 * @param type name of the transport that generated the address
1605 * @param addr one of the addresses of the host, NULL for the last address
1606 * the specific address format depends on the transport
1607 * @param addrlen length of the address
1608 * @param numeric should (IP) addresses be displayed in numeric form?
1609 * @param timeout after how long should we give up?
1610 * @param asc function to call on each string
1611 * @param asc_cls closure for asc
1614 tcp_plugin_address_pretty_printer (void *cls,
1619 struct GNUNET_TIME_Relative timeout,
1620 GNUNET_TRANSPORT_AddressStringCallback asc,
1623 struct Plugin *plugin = cls;
1624 struct PrettyPrinterContext *ppc;
1627 struct sockaddr_in a4;
1628 struct sockaddr_in6 a6;
1629 const struct IPv4TcpAddress *t4;
1630 const struct IPv6TcpAddress *t6;
1633 if (addrlen == sizeof (struct IPv6TcpAddress))
1636 memset (&a6, 0, sizeof (a6));
1637 a6.sin6_family = AF_INET6;
1638 a6.sin6_port = t6->t6_port;
1639 memcpy (&a6.sin6_addr,
1641 sizeof (struct in6_addr));
1642 port = ntohs (t6->t6_port);
1646 else if (addrlen == sizeof (struct IPv4TcpAddress))
1649 memset (&a4, 0, sizeof (a4));
1650 a4.sin_family = AF_INET;
1651 a4.sin_port = t4->t_port;
1652 a4.sin_addr.s_addr = t4->ipv4_addr;
1653 port = ntohs (t4->t_port);
1659 /* invalid address */
1660 GNUNET_break_op (0);
1661 asc (asc_cls, NULL);
1664 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
1666 ppc->asc_cls = asc_cls;
1668 GNUNET_RESOLVER_hostname_get (plugin->env->cfg,
1671 !numeric, timeout, &append_port, ppc);
1676 * Check if the given port is plausible (must be either our listen
1677 * port or our advertised port), or any port if we are behind NAT
1678 * and do not have a port open. If it is neither, we return
1681 * @param plugin global variables
1682 * @param in_port port number to check
1683 * @return GNUNET_OK if port is either open_port or adv_port
1686 check_port (struct Plugin *plugin,
1689 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
1691 return GNUNET_SYSERR;
1696 * Function that will be called to check if a binary address for this
1697 * plugin is well-formed and corresponds to an address for THIS peer
1698 * (as per our configuration). Naturally, if absolutely necessary,
1699 * plugins can be a bit conservative in their answer, but in general
1700 * plugins should make sure that the address does not redirect
1701 * traffic to a 3rd party that might try to man-in-the-middle our
1704 * @param cls closure, our 'struct Plugin*'
1705 * @param addr pointer to the address
1706 * @param addrlen length of addr
1707 * @return GNUNET_OK if this is a plausible address for this peer
1708 * and transport, GNUNET_SYSERR if not
1711 tcp_plugin_check_address (void *cls,
1715 struct Plugin *plugin = cls;
1716 struct IPv4TcpAddress *v4;
1717 struct IPv6TcpAddress *v6;
1719 if ((addrlen != sizeof (struct IPv4TcpAddress)) &&
1720 (addrlen != sizeof (struct IPv6TcpAddress)))
1722 GNUNET_break_op (0);
1723 return GNUNET_SYSERR;
1725 if (addrlen == sizeof (struct IPv4TcpAddress))
1727 v4 = (struct IPv4TcpAddress *) addr;
1729 check_mapped_addr (plugin, v4, sizeof (struct IPv4TcpAddress)))
1732 check_port (plugin, ntohs (v4->t_port)))
1733 return GNUNET_SYSERR;
1735 check_local_addr (plugin, &v4->ipv4_addr, sizeof (struct in_addr)))
1736 return GNUNET_SYSERR;
1740 v6 = (struct IPv6TcpAddress *) addr;
1741 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
1743 GNUNET_break_op (0);
1744 return GNUNET_SYSERR;
1747 check_mapped_addr (plugin, v6, sizeof (struct IPv6TcpAddress)))
1750 check_port (plugin, ntohs (v6->t6_port)))
1751 return GNUNET_SYSERR;
1753 check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
1754 return GNUNET_SYSERR;
1761 * We've received a nat probe from this peer via TCP. Finish
1762 * creating the client session and resume sending of queued
1765 * @param cls closure
1766 * @param client identification of the client
1767 * @param message the actual message
1770 handle_tcp_nat_probe (void *cls,
1771 struct GNUNET_SERVER_Client *client,
1772 const struct GNUNET_MessageHeader *message)
1774 struct Plugin *plugin = cls;
1775 struct Session *session;
1776 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
1779 struct IPv4TcpAddress *t4;
1780 struct IPv6TcpAddress *t6;
1781 const struct sockaddr_in *s4;
1782 const struct sockaddr_in6 *s6;
1785 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1787 "received tcp NAT probe\n");
1789 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
1790 * a connection to this peer by running gnunet-nat-client. This peer
1791 * received the punch message and now wants us to use the new connection
1792 * as the default for that peer. Do so and then send a WELCOME message
1793 * so we can really be connected!
1795 if (ntohs(message->size) != sizeof(struct TCP_NAT_ProbeMessage))
1800 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *)message;
1801 session = GNUNET_CONTAINER_multihashmap_get(plugin->nat_wait_conns,
1802 &tcp_nat_probe->clientIdentity.hashPubKey);
1803 if (session == NULL)
1806 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1808 "Did NOT find session for NAT probe!\n");
1810 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1814 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1816 "Found session for NAT probe!\n");
1818 GNUNET_assert(GNUNET_CONTAINER_multihashmap_remove(plugin->nat_wait_conns,
1819 &tcp_nat_probe->clientIdentity.hashPubKey,
1820 session) == GNUNET_YES);
1822 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1825 GNUNET_free (session);
1826 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1830 GNUNET_SERVER_client_keep (client);
1831 session->client = client;
1832 session->last_activity = GNUNET_TIME_absolute_get ();
1833 session->inbound = GNUNET_NO;
1836 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1838 "Found address `%s' for incoming connection\n",
1839 GNUNET_a2s (vaddr, alen));
1841 switch (((const struct sockaddr *)vaddr)->sa_family)
1845 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1846 t4->t_port = s4->sin_port;
1847 t4->ipv4_addr = s4->sin_addr.s_addr;
1848 session->connect_addr = t4;
1849 session->connect_alen = sizeof (struct IPv4TcpAddress);
1853 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1854 t6->t6_port = s6->sin6_port;
1855 memcpy (&t6->ipv6_addr,
1857 sizeof (struct in6_addr));
1858 session->connect_addr = t6;
1859 session->connect_alen = sizeof (struct IPv6TcpAddress);
1862 GNUNET_break_op (0);
1864 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1866 "Bad address for incoming connection!\n");
1868 GNUNET_free (vaddr);
1869 GNUNET_SERVER_client_drop (client);
1870 GNUNET_free (session);
1871 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1874 GNUNET_free (vaddr);
1876 session->next = plugin->sessions;
1877 plugin->sessions = session;
1878 GNUNET_STATISTICS_update (plugin->env->stats,
1879 gettext_noop ("# TCP sessions active"),
1882 process_pending_messages (session);
1883 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1888 * We've received a welcome from this peer via TCP. Possibly create a
1889 * fresh client record and send back our welcome.
1891 * @param cls closure
1892 * @param client identification of the client
1893 * @param message the actual message
1896 handle_tcp_welcome (void *cls,
1897 struct GNUNET_SERVER_Client *client,
1898 const struct GNUNET_MessageHeader *message)
1900 struct Plugin *plugin = cls;
1901 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
1902 struct Session *session;
1905 struct IPv4TcpAddress *t4;
1906 struct IPv6TcpAddress *t6;
1907 const struct sockaddr_in *s4;
1908 const struct sockaddr_in6 *s6;
1911 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1913 "Received %s message from `%4s'.\n",
1915 GNUNET_i2s (&wm->clientIdentity));
1917 GNUNET_STATISTICS_update (plugin->env->stats,
1918 gettext_noop ("# TCP WELCOME messages received"),
1921 session = find_session_by_client (plugin, client);
1923 if (session == NULL)
1926 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1928 "Received %s message from a `%4s', creating new session\n",
1930 GNUNET_i2s (&wm->clientIdentity));
1932 GNUNET_SERVER_client_keep (client);
1933 session = create_session (plugin,
1934 &wm->clientIdentity,
1937 session->inbound = GNUNET_YES;
1939 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1942 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1944 "Found address `%s' for incoming connection\n",
1945 GNUNET_a2s (vaddr, alen));
1947 if (alen == sizeof (struct sockaddr_in))
1950 t4 = GNUNET_malloc (sizeof (struct IPv4TcpAddress));
1951 t4->t_port = s4->sin_port;
1952 t4->ipv4_addr = s4->sin_addr.s_addr;
1953 session->connect_addr = t4;
1954 session->connect_alen = sizeof (struct IPv4TcpAddress);
1956 else if (alen == sizeof (struct sockaddr_in6))
1959 t6 = GNUNET_malloc (sizeof (struct IPv6TcpAddress));
1960 t6->t6_port = s6->sin6_port;
1961 memcpy (&t6->ipv6_addr,
1963 sizeof (struct in6_addr));
1964 session->connect_addr = t6;
1965 session->connect_alen = sizeof (struct IPv6TcpAddress);
1968 GNUNET_free (vaddr);
1973 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1975 "Did not obtain TCP socket address for incoming connection\n");
1978 process_pending_messages (session);
1984 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
1986 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
1988 "Found address `%s' (already have session)\n",
1989 GNUNET_a2s (vaddr, alen));
1994 if (session->expecting_welcome != GNUNET_YES)
1996 GNUNET_break_op (0);
1997 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2000 session->last_activity = GNUNET_TIME_absolute_get ();
2001 session->expecting_welcome = GNUNET_NO;
2002 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2007 * Task to signal the server that we can continue
2008 * receiving from the TCP client now.
2010 * @param cls the 'struct Session*'
2011 * @param tc task context (unused)
2014 delayed_done (void *cls,
2015 const struct GNUNET_SCHEDULER_TaskContext *tc)
2017 struct Session *session = cls;
2018 struct GNUNET_TIME_Relative delay;
2020 session->receive_delay_task = GNUNET_SCHEDULER_NO_TASK;
2021 delay = session->plugin->env->receive (session->plugin->env->cls,
2027 if (delay.rel_value == 0)
2028 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
2030 session->receive_delay_task =
2031 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2036 * We've received data for this peer via TCP. Unbox,
2037 * compute latency and forward.
2039 * @param cls closure
2040 * @param client identification of the client
2041 * @param message the actual message
2044 handle_tcp_data (void *cls,
2045 struct GNUNET_SERVER_Client *client,
2046 const struct GNUNET_MessageHeader *message)
2048 struct Plugin *plugin = cls;
2049 struct Session *session;
2050 struct GNUNET_TIME_Relative delay;
2053 type = ntohs (message->type);
2054 if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2055 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
2057 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2058 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2061 session = find_session_by_client (plugin, client);
2062 if ( (NULL == session) || (GNUNET_YES == session->expecting_welcome) )
2064 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2067 session->last_activity = GNUNET_TIME_absolute_get ();
2069 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2071 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2072 (unsigned int) ntohs (message->size),
2073 (unsigned int) ntohs (message->type),
2074 GNUNET_i2s (&session->target));
2076 GNUNET_STATISTICS_update (plugin->env->stats,
2077 gettext_noop ("# bytes received via TCP"),
2078 ntohs (message->size),
2080 struct GNUNET_TRANSPORT_ATS_Information distance[2];
2081 distance[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2082 distance[0].value = htonl (1);
2083 distance[1].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2084 distance[1].value = htonl (0);
2085 delay = plugin->env->receive (plugin->env->cls, &session->target, message,
2086 (const struct GNUNET_TRANSPORT_ATS_Information *) &distance,
2089 (GNUNET_YES == session->inbound) ? NULL : session->connect_addr,
2090 (GNUNET_YES == session->inbound) ? 0 : session->connect_alen);
2091 if (delay.rel_value == 0)
2092 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2094 session->receive_delay_task =
2095 GNUNET_SCHEDULER_add_delayed (delay, &delayed_done, session);
2100 * Functions with this signature are called whenever a peer
2101 * is disconnected on the network level.
2103 * @param cls closure
2104 * @param client identification of the client
2107 disconnect_notify (void *cls,
2108 struct GNUNET_SERVER_Client *client)
2110 struct Plugin *plugin = cls;
2111 struct Session *session;
2115 session = find_session_by_client (plugin, client);
2116 if (session == NULL)
2117 return; /* unknown, nothing to do */
2119 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2121 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2122 GNUNET_i2s (&session->target),
2123 (session->connect_addr != NULL) ?
2124 tcp_address_to_string (session->plugin,
2125 session->connect_addr,
2126 session->connect_alen) : "*");
2128 disconnect_session (session);
2133 * Add the IP of our network interface to the list of
2134 * our internal IP addresses.
2136 * @param cls the 'struct Plugin*'
2137 * @param name name of the interface
2138 * @param isDefault do we think this may be our default interface
2139 * @param addr address of the interface
2140 * @param addrlen number of bytes in addr
2141 * @return GNUNET_OK to continue iterating
2144 process_interfaces (void *cls,
2147 const struct sockaddr *addr, socklen_t addrlen)
2149 struct Plugin *plugin = cls;
2151 struct IPv4TcpAddress t4;
2152 struct IPv6TcpAddress t6;
2153 struct IPv4TcpAddress t4_nat;
2154 struct IPv6TcpAddress t6_nat;
2158 char buf[INET_ADDRSTRLEN];
2160 af = addr->sa_family;
2165 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
2166 GNUNET_assert (NULL != inet_ntop(AF_INET,
2170 if ( (plugin->bind_address != NULL) &&
2171 (0 != strcmp(buf, plugin->bind_address)) )
2174 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2176 "Not notifying transport of address `%s' (redundant)\n",
2177 GNUNET_a2s (addr, addrlen));
2181 if ( (plugin->internal_address == NULL) &&
2183 plugin->internal_address = GNUNET_strdup (buf);
2184 add_to_address_list (plugin, &t4.ipv4_addr, sizeof (struct in_addr));
2185 if (plugin->behind_nat == GNUNET_YES)
2187 /* Also advertise as NAT (with port 0) */
2188 t4_nat.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
2189 t4_nat.t_port = htons(0);
2192 t4.t_port = htons (plugin->adv_port);
2197 if ( (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr)) ||
2198 (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(plugin->env->cfg,
2202 /* skip link local addresses */
2205 memcpy (&t6.ipv6_addr,
2206 &((struct sockaddr_in6 *) addr)->sin6_addr,
2207 sizeof (struct in6_addr));
2208 add_to_address_list (plugin,
2210 sizeof (struct in6_addr));
2211 if (plugin->behind_nat == GNUNET_YES)
2213 /* Also advertise as NAT (with port 0) */
2214 memcpy (&t6_nat.ipv6_addr,
2215 &((struct sockaddr_in6 *) addr)->sin6_addr,
2216 sizeof (struct in6_addr));
2217 t6_nat.t6_port = htons(0);
2220 t6.t6_port = htons (plugin->adv_port);
2229 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2231 "Found address `%s' (%s) len %d\n",
2232 GNUNET_a2s (addr, addrlen), name, args);
2234 plugin->env->notify_address (plugin->env->cls,
2236 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
2238 if (arg_nat != NULL)
2240 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2242 _("Found address `%s' (%s) len %d\n"),
2243 GNUNET_a2s (addr, addrlen), name, args);
2244 plugin->env->notify_address (plugin->env->cls,
2246 arg_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
2254 * Function called by the resolver for each address obtained from DNS
2255 * for our own hostname. Add the addresses to the list of our
2256 * external IP addresses.
2258 * @param cls closure
2259 * @param addr one of the addresses of the host, NULL for the last address
2260 * @param addrlen length of the address
2263 process_hostname_ips (void *cls,
2264 const struct sockaddr *addr, socklen_t addrlen)
2266 struct Plugin *plugin = cls;
2270 plugin->hostname_dns = NULL;
2273 /* FIXME: Can we figure out our external address here so it doesn't need to be user specified? */
2274 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
2279 * We can now send a probe message, copy into buffer to really send.
2281 * @param cls closure, a struct TCPProbeContext
2282 * @param size max size to copy
2283 * @param buf buffer to copy message to
2284 * @return number of bytes copied into buf
2287 notify_send_probe (void *cls,
2291 struct TCPProbeContext *tcp_probe_ctx = cls;
2292 struct Plugin *plugin = tcp_probe_ctx->plugin;
2295 tcp_probe_ctx->transmit_handle = NULL;
2296 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
2301 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock, GNUNET_NO);
2302 GNUNET_free(tcp_probe_ctx);
2305 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2306 memcpy(buf, &tcp_probe_ctx->message, sizeof(tcp_probe_ctx->message));
2307 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2308 tcp_probe_ctx->sock);
2309 ret = sizeof(tcp_probe_ctx->message);
2310 GNUNET_free(tcp_probe_ctx);
2316 * We have been notified that gnunet-nat-server has written something to stdout.
2317 * Handle the output, then reschedule this function to be called again once
2318 * more is available.
2320 * @param cls the plugin handle
2321 * @param tc the scheduling context
2324 tcp_plugin_server_read (void *cls,
2325 const struct GNUNET_SCHEDULER_TaskContext *tc)
2327 struct Plugin *plugin = cls;
2332 const char *port_start;
2333 struct sockaddr_in sin_addr;
2334 struct TCPProbeContext *tcp_probe_ctx;
2335 struct GNUNET_CONNECTION_Handle *sock;
2337 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2339 memset (mybuf, 0, sizeof(mybuf));
2340 bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle,
2346 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2348 "Finished reading from server stdout with code: %d\n",
2355 for (i = 0; i < sizeof(mybuf); i++)
2357 if (mybuf[i] == '\n')
2362 if ( (mybuf[i] == ':') && (i + 1 < sizeof(mybuf)) )
2365 port_start = &mybuf[i + 1];
2369 /* construct socket address of sender */
2370 memset (&sin_addr, 0, sizeof (sin_addr));
2371 sin_addr.sin_family = AF_INET;
2372 sin_addr.sin_port = htons((uint16_t) port);
2373 #if HAVE_SOCKADDR_IN_SIN_LEN
2374 sin_addr.sin_len = sizeof (sin_addr);
2376 if ( (NULL == port_start) ||
2377 (1 != sscanf (port_start, "%d", &port)) ||
2378 (-1 == inet_pton(AF_INET, mybuf, &sin_addr.sin_addr)) )
2380 /* should we restart gnunet-nat-server? */
2381 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2383 _("gnunet-nat-server generated malformed address `%s'\n"),
2385 plugin->server_read_task
2386 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2387 plugin->server_stdout_handle,
2388 &tcp_plugin_server_read,
2394 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2396 "gnunet-nat-server read: %s:%d\n",
2401 * We have received an ICMP response, ostensibly from a peer
2402 * that wants to connect to us! Send a message to establish a connection.
2404 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET,
2405 (const struct sockaddr *)&sin_addr,
2409 /* failed for some odd reason (out of sockets?); ignore attempt */
2410 plugin->server_read_task =
2411 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2412 plugin->server_stdout_handle,
2413 &tcp_plugin_server_read,
2418 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2419 "Sending TCP probe message to `%s:%u'!\n",
2421 (unsigned int) port);
2422 /* FIXME: do we need to track these probe context objects so that
2423 we can clean them up on plugin unload? */
2425 = GNUNET_malloc(sizeof(struct TCPProbeContext));
2426 tcp_probe_ctx->message.header.size
2427 = htons(sizeof(struct TCP_NAT_ProbeMessage));
2428 tcp_probe_ctx->message.header.type
2429 = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2430 memcpy (&tcp_probe_ctx->message.clientIdentity,
2431 plugin->env->my_identity,
2432 sizeof(struct GNUNET_PeerIdentity));
2433 tcp_probe_ctx->plugin = plugin;
2434 tcp_probe_ctx->sock = sock;
2435 GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
2438 tcp_probe_ctx->transmit_handle
2439 = GNUNET_CONNECTION_notify_transmit_ready (sock,
2440 ntohs (tcp_probe_ctx->message.header.size),
2441 GNUNET_TIME_UNIT_FOREVER_REL,
2442 ¬ify_send_probe, tcp_probe_ctx);
2444 plugin->server_read_task =
2445 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2446 plugin->server_stdout_handle,
2447 &tcp_plugin_server_read,
2453 * Start the gnunet-nat-server process for users behind NAT.
2455 * @param plugin the transport plugin
2456 * @return GNUNET_YES if process was started, GNUNET_SYSERR on error
2459 tcp_transport_start_nat_server (struct Plugin *plugin)
2461 if (plugin->internal_address == NULL)
2462 return GNUNET_SYSERR;
2463 plugin->server_stdout = GNUNET_DISK_pipe (GNUNET_YES,
2466 if (plugin->server_stdout == NULL)
2467 return GNUNET_SYSERR;
2469 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2472 "gnunet-nat-server",
2473 plugin->internal_address);
2475 /* Start the server process */
2476 plugin->server_proc = GNUNET_OS_start_process (NULL,
2477 plugin->server_stdout,
2478 "gnunet-nat-server",
2479 "gnunet-nat-server",
2480 plugin->internal_address,
2482 if (plugin->server_proc == NULL)
2484 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2486 _("Failed to start %s\n"),
2487 "gnunet-nat-server");
2488 GNUNET_DISK_pipe_close (plugin->server_stdout);
2489 plugin->server_stdout = NULL;
2490 return GNUNET_SYSERR;
2492 /* Close the write end of the read pipe */
2493 GNUNET_DISK_pipe_close_end(plugin->server_stdout,
2494 GNUNET_DISK_PIPE_END_WRITE);
2495 plugin->server_stdout_handle
2496 = GNUNET_DISK_pipe_handle (plugin->server_stdout,
2497 GNUNET_DISK_PIPE_END_READ);
2498 plugin->server_read_task
2499 = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
2500 plugin->server_stdout_handle,
2501 &tcp_plugin_server_read,
2508 * Return the actual path to a file found in the current
2509 * PATH environment variable.
2511 * @param binary the name of the file to find
2512 * @return path to binary, NULL if not found
2515 get_path_from_PATH (const char *binary)
2523 p = getenv ("PATH");
2526 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2528 _("PATH environment variable is unset.\n"));
2531 path = GNUNET_strdup (p); /* because we write on it */
2532 buf = GNUNET_malloc (strlen (path) + 20);
2535 while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
2538 sprintf (buf, "%s/%s", pos, binary);
2539 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2546 sprintf (buf, "%s/%s", pos, binary);
2547 if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
2559 * Check whether the suid bit is set on a file.
2560 * Attempts to find the file using the current
2561 * PATH environment variable as a search path.
2563 * @param binary the name of the file to check
2564 * @return GNUNET_YES if the file is SUID,
2566 * GNUNET_SYSERR on error
2569 check_gnunet_nat_binary (const char *binary)
2571 struct stat statbuf;
2577 GNUNET_asprintf (&binaryexe, "%s.exe", binary);
2578 p = get_path_from_PATH (binaryexe);
2581 p = get_path_from_PATH (binary);
2585 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2587 _("Could not find binary `%s' in PATH!\n"),
2591 if (0 != STAT (p, &statbuf))
2593 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2594 _("stat (%s) failed: %s\n"),
2598 return GNUNET_SYSERR;
2602 if ( (0 != (statbuf.st_mode & S_ISUID)) &&
2603 (statbuf.st_uid == 0) )
2607 rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
2608 if (INVALID_SOCKET == rawsock)
2610 DWORD err = GetLastError ();
2611 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2613 "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) failed! GLE = %d\n", err);
2614 return GNUNET_NO; /* not running as administrator */
2616 closesocket (rawsock);
2623 * Our (external) hostname was resolved.
2625 * @param cls the 'struct Plugin'
2626 * @param addr NULL on error, otherwise result of DNS lookup
2627 * @param addrlen number of bytes in addr
2630 process_external_ip (void *cls,
2631 const struct sockaddr *addr,
2634 struct Plugin *plugin = cls;
2635 const struct sockaddr_in *s;
2636 struct IPv4TcpAddress t4;
2639 plugin->ext_dns = NULL;
2642 GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
2643 s = (const struct sockaddr_in *) addr;
2644 t4.ipv4_addr = s->sin_addr.s_addr;
2645 if ( (plugin->behind_nat == GNUNET_YES) &&
2646 (plugin->enable_nat_server == GNUNET_YES) )
2648 t4.t_port = htons(0);
2649 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2651 "Notifying transport of address %s:%d\n",
2652 plugin->external_address,
2657 t4.t_port = htons(plugin->adv_port);
2658 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
2660 "Notifying transport of address %s:%d\n",
2661 plugin->external_address,
2662 (int) plugin->adv_port);
2664 add_to_address_list (plugin,
2666 sizeof (struct in_addr));
2667 plugin->env->notify_address (plugin->env->cls,
2670 GNUNET_TIME_UNIT_FOREVER_REL);
2675 * Entry point for the plugin.
2677 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
2678 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
2681 libgnunet_plugin_transport_tcp_init (void *cls)
2683 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2684 {&handle_tcp_welcome, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2685 sizeof (struct WelcomeMessage)},
2686 {&handle_tcp_nat_probe, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE, sizeof (struct TCP_NAT_ProbeMessage)},
2687 {&handle_tcp_data, NULL, GNUNET_MESSAGE_TYPE_ALL, 0},
2690 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2691 struct GNUNET_TRANSPORT_PluginFunctions *api;
2692 struct Plugin *plugin;
2693 struct GNUNET_SERVICE_Context *service;
2694 unsigned long long aport;
2695 unsigned long long bport;
2699 int enable_nat_client;
2700 int enable_nat_server;
2702 char *internal_address;
2703 char *external_address;
2704 struct sockaddr_in in_addr;
2705 struct GNUNET_TIME_Relative idle_timeout;
2707 behind_nat = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2710 nat_punched = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2713 enable_nat_client = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2715 "ENABLE_NAT_CLIENT");
2716 enable_nat_server = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2718 "ENABLE_NAT_SERVER");
2719 enable_upnp = GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2723 if ( (GNUNET_YES == enable_nat_server) &&
2724 (GNUNET_YES != check_gnunet_nat_binary("gnunet-nat-server")) )
2726 enable_nat_server = GNUNET_NO;
2727 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2728 _("Configuration requires `%s', but binary is not installed properly (SUID bit not set). Option disabled.\n"),
2729 "gnunet-nat-server");
2732 if ( (GNUNET_YES == enable_nat_client) &&
2733 (GNUNET_YES != check_gnunet_nat_binary("gnunet-nat-client")) )
2735 enable_nat_client = GNUNET_NO;
2736 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2737 _("Configuration requires `%s', but binary is not installed properly (SUID bit not set). Option disabled.\n"),
2738 "gnunet-nat-client");
2741 external_address = NULL;
2743 GNUNET_CONFIGURATION_have_value (env->cfg,
2745 "EXTERNAL_ADDRESS"))
2747 (void) GNUNET_CONFIGURATION_get_value_string (env->cfg,
2753 if ( (external_address != NULL) &&
2754 (inet_pton(AF_INET, external_address, &in_addr.sin_addr) != 1) )
2757 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2759 _("Malformed %s `%s' given in configuration!\n"),
2764 if ( (external_address == NULL) &&
2765 (nat_punched == GNUNET_YES) )
2767 nat_punched = GNUNET_NO;
2768 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2769 _("Configuration says NAT was punched, but `%s' is not given. Option ignored.\n"),
2770 "EXTERNAL_ADDRESS");
2773 if (GNUNET_YES == nat_punched)
2775 enable_nat_server = GNUNET_NO;
2776 enable_upnp = GNUNET_NO;
2779 internal_address = NULL;
2781 GNUNET_CONFIGURATION_have_value (env->cfg,
2783 "INTERNAL_ADDRESS"))
2785 (void) GNUNET_CONFIGURATION_get_value_string (env->cfg,
2791 if ( (internal_address != NULL) &&
2792 (inet_pton(AF_INET, internal_address, &in_addr.sin_addr) != 1) )
2794 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2796 _("Malformed %s `%s' given in configuration!\n"),
2799 GNUNET_free_non_null(internal_address);
2800 GNUNET_free_non_null(external_address);
2806 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2812 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2818 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2820 _("Require valid port number for service `%s' in configuration!\n"),
2822 GNUNET_free_non_null(external_address);
2823 GNUNET_free_non_null(internal_address);
2834 service = GNUNET_SERVICE_start ("transport-tcp", env->cfg);
2835 if (service == NULL)
2837 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
2839 _("Failed to start service.\n"));
2846 plugin = GNUNET_malloc (sizeof (struct Plugin));
2847 plugin->open_port = bport;
2848 plugin->adv_port = aport;
2849 plugin->external_address = external_address;
2850 plugin->internal_address = internal_address;
2851 plugin->behind_nat = behind_nat;
2852 plugin->nat_punched = nat_punched;
2853 plugin->enable_nat_client = enable_nat_client;
2854 plugin->enable_nat_server = enable_nat_server;
2855 plugin->enable_upnp = enable_upnp;
2857 plugin->lsock = NULL;
2858 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
2860 api->send = &tcp_plugin_send;
2861 api->disconnect = &tcp_plugin_disconnect;
2862 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2863 api->check_address = &tcp_plugin_check_address;
2864 api->address_to_string = &tcp_address_to_string;
2865 plugin->service = service;
2866 if (service != NULL)
2868 plugin->server = GNUNET_SERVICE_get_server (service);
2873 GNUNET_CONFIGURATION_get_value_time (env->cfg,
2878 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2880 _("Failed to find option %s in section %s!\n"),
2883 GNUNET_free_non_null(external_address);
2884 GNUNET_free_non_null(internal_address);
2888 plugin->server = GNUNET_SERVER_create_with_sockets (NULL, NULL, NULL,
2889 idle_timeout, GNUNET_YES);
2891 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2892 memcpy (plugin->handlers, my_handlers, sizeof (my_handlers));
2894 i < sizeof (my_handlers) / sizeof (struct GNUNET_SERVER_MessageHandler);
2896 plugin->handlers[i].callback_cls = plugin;
2897 GNUNET_SERVER_add_handlers (plugin->server, plugin->handlers);
2898 GNUNET_SERVER_disconnect_notify (plugin->server,
2901 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
2903 if ( (plugin->behind_nat == GNUNET_YES) &&
2904 (plugin->enable_nat_server == GNUNET_YES) &&
2905 (GNUNET_YES != tcp_transport_start_nat_server(plugin)) )
2907 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
2909 _("Failed to start %s required for NAT in %s!\n"),
2912 GNUNET_free_non_null(external_address);
2913 GNUNET_free_non_null(internal_address);
2914 if (service != NULL)
2915 GNUNET_SERVICE_stop (service);
2917 GNUNET_SERVER_destroy (plugin->server);
2922 if (enable_nat_client == GNUNET_YES)
2924 plugin->nat_wait_conns = GNUNET_CONTAINER_multihashmap_create(16);
2925 GNUNET_assert (plugin->nat_wait_conns != NULL);
2929 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2931 _("TCP transport listening on port %llu\n"),
2934 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2936 _("TCP transport not listening on any port (client only)\n"));
2938 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2940 _("TCP transport advertises itself as being on port %llu\n"),
2943 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string (env->cfg,
2946 &plugin->bind_address))
2948 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
2950 _("Binding TCP plugin to specific address: `%s'\n"),
2951 plugin->bind_address);
2954 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->cfg,
2956 HOSTNAME_RESOLVE_TIMEOUT,
2957 &process_hostname_ips,
2960 if (plugin->external_address != NULL)
2962 plugin->ext_dns = GNUNET_RESOLVER_ip_get (env->cfg,
2963 plugin->external_address,
2965 GNUNET_TIME_UNIT_MINUTES,
2966 &process_external_ip,
2974 * Exit point from the plugin.
2977 libgnunet_plugin_transport_tcp_done (void *cls)
2979 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
2980 struct Plugin *plugin = api->cls;
2981 struct Session *session;
2982 struct LocalAddrList *lal;
2983 struct TCPProbeContext *tcp_probe;
2985 if (plugin->ext_dns != NULL)
2987 GNUNET_RESOLVER_request_cancel (plugin->ext_dns);
2988 plugin->ext_dns = NULL;
2990 while (NULL != (session = plugin->sessions))
2991 disconnect_session (session);
2992 if (NULL != plugin->hostname_dns)
2994 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
2995 plugin->hostname_dns = NULL;
2997 if (plugin->service != NULL)
2998 GNUNET_SERVICE_stop (plugin->service);
3000 GNUNET_SERVER_destroy (plugin->server);
3001 GNUNET_free (plugin->handlers);
3002 while (NULL != (lal = plugin->lal_head))
3004 GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
3007 if (lal->nat != NULL)
3008 GNUNET_NAT_unregister (lal->nat);
3009 GNUNET_free_non_null (lal->external_nat_address);
3012 while (NULL != (tcp_probe = plugin->probe_head))
3014 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
3017 GNUNET_CONNECTION_destroy (tcp_probe->sock, GNUNET_NO);
3018 GNUNET_free (tcp_probe);
3021 if ((plugin->behind_nat == GNUNET_YES) &&
3022 (plugin->enable_nat_server == GNUNET_YES))
3024 if (0 != GNUNET_OS_process_kill (plugin->server_proc, SIGTERM))
3025 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
3026 GNUNET_OS_process_wait (plugin->server_proc);
3027 GNUNET_OS_process_close (plugin->server_proc);
3028 plugin->server_proc = NULL;
3030 GNUNET_free_non_null(plugin->bind_address);
3031 GNUNET_free (plugin);
3036 /* end of plugin_transport_tcp.c */