2 This file is part of GNUnet
3 Copyright (C) 2002--2015 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
21 * @file transport/plugin_transport_tcp.c
22 * @brief Implementation of the TCP transport service
23 * @author Christian Grothoff
26 #include "gnunet_hello_lib.h"
27 #include "gnunet_constants.h"
28 #include "gnunet_util_lib.h"
29 #include "gnunet_nat_lib.h"
30 #include "gnunet_protocols.h"
31 #include "gnunet_resolver_service.h"
32 #include "gnunet_signatures.h"
33 #include "gnunet_statistics_service.h"
34 #include "gnunet_transport_service.h"
35 #include "gnunet_transport_plugin.h"
36 #include "transport.h"
38 #define LOG(kind,...) GNUNET_log_from (kind, "transport-tcp",__VA_ARGS__)
40 #define PLUGIN_NAME "tcp"
43 * How long until we give up on establishing an NAT connection?
46 #define NAT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
48 GNUNET_NETWORK_STRUCT_BEGIN
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;
69 * Basically a WELCOME message, but with the purpose
70 * of giving the waiting peer a client handle to use
72 struct TCP_NAT_ProbeMessage
75 * Type is #GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE.
77 struct GNUNET_MessageHeader header;
80 * Identity of the sender of the message.
82 struct GNUNET_PeerIdentity clientIdentity;
85 GNUNET_NETWORK_STRUCT_END
88 * Context for sending a NAT probe via TCP.
90 struct TCPProbeContext
94 * Active probes are kept in a DLL.
96 struct TCPProbeContext *next;
99 * Active probes are kept in a DLL.
101 struct TCPProbeContext *prev;
106 struct GNUNET_CONNECTION_Handle *sock;
109 * Message to be sent.
111 struct TCP_NAT_ProbeMessage message;
114 * Handle to the transmission.
116 struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
119 * Transport plugin handle.
121 struct Plugin *plugin;
125 * Bits in the `options` field of TCP addresses.
127 enum TcpAddressOptions
133 TCP_OPTIONS_NONE = 0,
136 * See #HTTP_OPTIONS_VERIFY_CERTIFICATE.
138 TCP_OPTIONS_RESERVED = 1,
141 * Enable TCP Stealth-style port knocking.
143 TCP_OPTIONS_TCP_STEALTH = 2
146 GNUNET_NETWORK_STRUCT_BEGIN
149 * Network format for IPv4 addresses.
151 struct IPv4TcpAddress
154 * Optional options and flags for this address,
155 * see `enum TcpAddressOptions`
160 * IPv4 address, in network byte order.
162 uint32_t ipv4_addr GNUNET_PACKED;
165 * Port number, in network byte order.
167 uint16_t t4_port GNUNET_PACKED;
172 * Network format for IPv6 addresses.
174 struct IPv6TcpAddress
177 * Optional flags for this address
178 * see `enum TcpAddressOptions`
185 struct in6_addr ipv6_addr GNUNET_PACKED;
188 * Port number, in network byte order.
190 uint16_t t6_port GNUNET_PACKED;
193 GNUNET_NETWORK_STRUCT_END
196 * Encapsulation of all of the state of the plugin.
201 * Information kept for each message that is yet to
204 struct PendingMessage
208 * This is a doubly-linked list.
210 struct PendingMessage *next;
213 * This is a doubly-linked list.
215 struct PendingMessage *prev;
218 * The pending message
223 * Continuation function to call once the message
224 * has been sent. Can be NULL if there is no
225 * continuation to call.
227 GNUNET_TRANSPORT_TransmitContinuation transmit_cont;
230 * Closure for @e transmit_cont.
232 void *transmit_cont_cls;
235 * Timeout value for the pending message.
237 struct GNUNET_TIME_Absolute timeout;
240 * So that the gnunet-service-transport can group messages together,
241 * these pending messages need to accept a message buffer and size
242 * instead of just a `struct GNUNET_MessageHeader`.
249 * Session handle for TCP connections.
254 * To whom are we talking to (set to our identity
255 * if we are still waiting for the welcome message)
257 struct GNUNET_PeerIdentity target;
260 * Pointer to the global plugin struct.
262 struct Plugin *plugin;
265 * The client (used to identify this connection)
267 struct GNUNET_SERVER_Client *client;
270 * Task cleaning up a NAT client connection establishment attempt;
272 struct GNUNET_SCHEDULER_Task *nat_connection_timeout;
275 * Messages currently pending for transmission
276 * to this peer, if any.
278 struct PendingMessage *pending_messages_head;
281 * Messages currently pending for transmission
282 * to this peer, if any.
284 struct PendingMessage *pending_messages_tail;
287 * Handle for pending transmission request.
289 struct GNUNET_SERVER_TransmitHandle *transmit_handle;
292 * Address of the other peer.
294 struct GNUNET_HELLO_Address *address;
297 * ID of task used to delay receiving more to throttle sender.
299 struct GNUNET_SCHEDULER_Task *receive_delay_task;
302 * Session timeout task
304 struct GNUNET_SCHEDULER_Task *timeout_task;
307 * When will this session time out?
309 struct GNUNET_TIME_Absolute timeout;
312 * When will we continue to read from the socket?
313 * (used to enforce inbound quota).
315 struct GNUNET_TIME_Absolute receive_delay;
318 * Last activity on this connection. Used to select preferred
321 struct GNUNET_TIME_Absolute last_activity;
324 * Number of bytes waiting for transmission to this peer.
326 unsigned long long bytes_in_queue;
329 * Number of messages waiting for transmission to this peer.
331 unsigned int msgs_in_queue;
334 * Network type of the address.
336 enum GNUNET_ATS_Network_Type scope;
339 * Are we still expecting the welcome message? (#GNUNET_YES/#GNUNET_NO)
341 int expecting_welcome;
344 * Was this session created using NAT traversal?
352 * Context for address to string conversion, closure
353 * for #append_port().
355 struct PrettyPrinterContext
360 struct PrettyPrinterContext *next;
365 struct PrettyPrinterContext *prev;
370 struct Plugin *plugin;
375 struct GNUNET_SCHEDULER_Task *timeout_task;
380 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
383 * Function to call with the result.
385 GNUNET_TRANSPORT_AddressStringCallback asc;
388 * Clsoure for @e asc.
403 * Port to add after the IP address.
410 * Encapsulation of all of the state of the plugin.
417 struct GNUNET_TRANSPORT_PluginEnvironment *env;
422 struct GNUNET_CONNECTION_Handle *lsock;
425 * Our handle to the NAT module.
427 struct GNUNET_NAT_Handle *nat;
430 * Map from peer identities to sessions for the given peer.
432 struct GNUNET_CONTAINER_MultiPeerMap *sessionmap;
435 * Handle to the network service.
437 struct GNUNET_SERVICE_Context *service;
440 * Handle to the server for this service.
442 struct GNUNET_SERVER_Handle *server;
445 * Copy of the handler array where the closures are
446 * set to this struct's instance.
448 struct GNUNET_SERVER_MessageHandler *handlers;
451 * Map of peers we have tried to contact behind a NAT
453 struct GNUNET_CONTAINER_MultiPeerMap *nat_wait_conns;
456 * List of active TCP probes.
458 struct TCPProbeContext *probe_head;
461 * List of active TCP probes.
463 struct TCPProbeContext *probe_tail;
466 * Handle for (DYN)DNS lookup of our external IP.
468 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
471 * Function to call about session status changes.
473 GNUNET_TRANSPORT_SessionInfoCallback sic;
476 * Closure for @e sic.
481 * ID of task used to update our addresses when one expires.
483 struct GNUNET_SCHEDULER_Task *address_update_task;
486 * Running pretty printers: head
488 struct PrettyPrinterContext *ppc_dll_head;
491 * Running pretty printers: tail
493 struct PrettyPrinterContext *ppc_dll_tail;
496 * Welcome message used by this peer.
498 struct WelcomeMessage my_welcome;
501 * How many more TCP sessions are we allowed to open right now?
503 unsigned long long max_connections;
506 * How many more TCP sessions do we have right now?
508 unsigned long long cur_connections;
516 * Port that we are actually listening on.
521 * Port that the user said we would have visible to the
530 * If a session monitor is attached, notify it about the new
533 * @param plugin our plugin
534 * @param session session that changed state
535 * @param state new state of the session
538 notify_session_monitor (struct Plugin *plugin,
539 struct Session *session,
540 enum GNUNET_TRANSPORT_SessionState state)
542 struct GNUNET_TRANSPORT_SessionInfo info;
544 if (NULL == plugin->sic)
546 memset (&info, 0, sizeof (info));
548 info.is_inbound = (0 != (GNUNET_HELLO_ADDRESS_INFO_INBOUND & session->address->local_info))
551 info.num_msg_pending = session->msgs_in_queue;
552 info.num_bytes_pending = session->bytes_in_queue;
553 if (NULL != session->receive_delay_task)
554 info.receive_delay = session->receive_delay;
555 info.session_timeout = session->timeout;
556 info.address = session->address;
557 plugin->sic (plugin->sic_cls,
564 * Our external IP address/port mapping has changed.
566 * @param cls closure, the `struct Plugin`
567 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
568 * the previous (now invalid) one
569 * @param addr either the previous or the new public IP address
570 * @param addrlen actual length of @a addr
573 tcp_nat_port_map_callback (void *cls,
575 const struct sockaddr *addr,
578 struct Plugin *plugin = cls;
579 struct GNUNET_HELLO_Address *address;
580 struct IPv4TcpAddress t4;
581 struct IPv6TcpAddress t6;
585 LOG(GNUNET_ERROR_TYPE_INFO,
586 "NAT notification to %s address `%s'\n",
587 (GNUNET_YES == add_remove) ? "add" : "remove",
588 GNUNET_a2s (addr, addrlen));
589 /* convert 'addr' to our internal format */
590 switch (addr->sa_family)
593 GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
594 memset (&t4, 0, sizeof(t4));
595 t4.options = htonl (plugin->myoptions);
596 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
597 t4.t4_port = ((struct sockaddr_in *) addr)->sin_port;
602 GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
603 memset (&t6, 0, sizeof(t6));
604 memcpy (&t6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
605 sizeof(struct in6_addr));
606 t6.options = htonl (plugin->myoptions);
607 t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
615 /* modify our published address list */
616 GNUNET_assert ((args == sizeof (struct IPv4TcpAddress)) ||
617 (args == sizeof (struct IPv6TcpAddress)));
618 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
619 PLUGIN_NAME, arg, args, GNUNET_HELLO_ADDRESS_INFO_NONE);
620 plugin->env->notify_address (plugin->env->cls, add_remove, address);
621 GNUNET_HELLO_address_free(address);
626 * Function called for a quick conversion of the binary address to
627 * a numeric address. Note that the caller must not free the
628 * address and that the next call to this function is allowed
629 * to override the address again.
631 * @param cls closure (`struct Plugin*`)
632 * @param addr binary address
633 * @param addrlen length of @a addr
634 * @return string representing the same address
637 tcp_plugin_address_to_string (void *cls,
641 static char rbuf[INET6_ADDRSTRLEN + 12];
642 char buf[INET6_ADDRSTRLEN];
646 const struct IPv4TcpAddress *t4;
647 const struct IPv6TcpAddress *t6;
654 case sizeof(struct IPv6TcpAddress):
657 port = ntohs (t6->t6_port);
658 options = ntohl (t6->options);
659 memcpy (&a6, &t6->ipv6_addr, sizeof(a6));
662 case sizeof(struct IPv4TcpAddress):
665 port = ntohs (t4->t4_port);
666 options = ntohl (t4->options);
667 memcpy (&a4, &t4->ipv4_addr, sizeof(a4));
671 LOG (GNUNET_ERROR_TYPE_WARNING,
672 _("Unexpected address length: %u bytes\n"),
673 (unsigned int) addrlen);
676 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
678 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
682 GNUNET_snprintf (rbuf, sizeof(rbuf),
683 (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u",
693 * Function called to convert a string address to
696 * @param cls closure (`struct Plugin*`)
697 * @param addr string address
698 * @param addrlen length of the address
699 * @param buf location to store the buffer
700 * @param added location to store the number of bytes in the buffer.
701 * If the function returns #GNUNET_SYSERR, its contents are undefined.
702 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
705 tcp_plugin_string_to_address (void *cls,
711 struct sockaddr_storage socket_address;
717 /* Format tcp.options.address:port */
721 if ((NULL == addr) || (0 == addrlen))
724 return GNUNET_SYSERR;
726 if ('\0' != addr[addrlen - 1])
729 return GNUNET_SYSERR;
731 if (strlen (addr) != addrlen - 1)
734 return GNUNET_SYSERR;
736 plugin = GNUNET_strdup (addr);
737 optionstr = strchr (plugin, '.');
738 if (NULL == optionstr)
742 return GNUNET_SYSERR;
746 options = atol (optionstr);
747 address = strchr (optionstr, '.');
752 return GNUNET_SYSERR;
758 GNUNET_STRINGS_to_address_ip (address,
764 return GNUNET_SYSERR;
768 switch (socket_address.ss_family)
772 struct IPv4TcpAddress *t4;
773 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
774 t4 = GNUNET_new (struct IPv4TcpAddress);
775 t4->options = htonl (options);
776 t4->ipv4_addr = in4->sin_addr.s_addr;
777 t4->t4_port = in4->sin_port;
779 *added = sizeof(struct IPv4TcpAddress);
784 struct IPv6TcpAddress *t6;
785 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
786 t6 = GNUNET_new (struct IPv6TcpAddress);
787 t6->options = htonl (options);
788 t6->ipv6_addr = in6->sin6_addr;
789 t6->t6_port = in6->sin6_port;
791 *added = sizeof(struct IPv6TcpAddress);
795 return GNUNET_SYSERR;
801 * Find the session handle for the given client.
802 * Currently uses both the hashmap and the client
803 * context, as the client context is new and the
804 * logic still needs to be tested.
806 * @param plugin the plugin
807 * @param client which client to find the session handle for
808 * @return NULL if no matching session exists
810 static struct Session *
811 lookup_session_by_client (struct Plugin *plugin,
812 struct GNUNET_SERVER_Client *client)
814 return GNUNET_SERVER_client_get_user_context (client,
820 * Functions with this signature are called whenever we need
821 * to close a session due to a disconnect or failure to
822 * establish a connection.
824 * @param cls the `struct Plugin`
825 * @param session session to close down
826 * @return #GNUNET_OK on success
829 tcp_plugin_disconnect_session (void *cls,
830 struct Session *session)
832 struct Plugin *plugin = cls;
833 struct PendingMessage *pm;
835 LOG (GNUNET_ERROR_TYPE_DEBUG,
836 "Disconnecting session of peer `%s' address `%s'\n",
837 GNUNET_i2s (&session->target),
838 tcp_plugin_address_to_string (session->plugin,
839 session->address->address,
840 session->address->address_length));
842 if (NULL != session->timeout_task)
844 GNUNET_SCHEDULER_cancel (session->timeout_task);
845 session->timeout_task = NULL;
846 session->timeout = GNUNET_TIME_UNIT_ZERO_ABS;
850 GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap,
854 GNUNET_STATISTICS_update (session->plugin->env->stats,
855 gettext_noop ("# TCP sessions active"),
861 GNUNET_assert (GNUNET_YES ==
862 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
866 if (NULL != session->client)
867 GNUNET_SERVER_client_set_user_context (session->client,
871 if (NULL != session->transmit_handle)
873 GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
874 session->transmit_handle = NULL;
876 session->plugin->env->session_end (session->plugin->env->cls,
880 if (NULL != session->nat_connection_timeout)
882 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
883 session->nat_connection_timeout = NULL;
886 while (NULL != (pm = session->pending_messages_head))
888 LOG (GNUNET_ERROR_TYPE_DEBUG,
889 (NULL != pm->transmit_cont)
890 ? "Could not deliver message to `%s' at %s.\n"
891 : "Could not deliver message to `%s' at %s, notifying.\n",
892 GNUNET_i2s (&session->target),
893 tcp_plugin_address_to_string (session->plugin,
894 session->address->address,
895 session->address->address_length));
896 GNUNET_STATISTICS_update (session->plugin->env->stats,
897 gettext_noop ("# bytes currently in TCP buffers"),
898 -(int64_t) pm->message_size, GNUNET_NO);
899 GNUNET_STATISTICS_update (session->plugin->env->stats,
900 gettext_noop ("# bytes discarded by TCP (disconnect)"),
903 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
904 session->pending_messages_tail,
906 GNUNET_assert (0 < session->msgs_in_queue);
907 session->msgs_in_queue--;
908 GNUNET_assert (pm->message_size <= session->bytes_in_queue);
909 session->bytes_in_queue -= pm->message_size;
910 if (NULL != pm->transmit_cont)
911 pm->transmit_cont (pm->transmit_cont_cls,
918 GNUNET_assert (0 == session->msgs_in_queue);
919 GNUNET_assert (0 == session->bytes_in_queue);
920 notify_session_monitor (session->plugin,
922 GNUNET_TRANSPORT_SS_DONE);
924 if (NULL != session->receive_delay_task)
926 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
927 session->receive_delay_task = NULL;
929 if (NULL != session->client)
931 GNUNET_SERVER_client_disconnect (session->client);
932 session->client = NULL;
934 GNUNET_HELLO_address_free (session->address);
935 GNUNET_assert (NULL == session->transmit_handle);
936 GNUNET_free (session);
942 * Function that is called to get the keepalive factor.
943 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
944 * calculate the interval between keepalive packets.
946 * @param cls closure with the `struct Plugin`
947 * @return keepalive factor
950 tcp_plugin_query_keepalive_factor (void *cls)
957 * Session was idle for too long, so disconnect it
959 * @param cls the `struct Session` of the idle session
960 * @param tc scheduler context
963 session_timeout (void *cls,
964 const struct GNUNET_SCHEDULER_TaskContext *tc)
966 struct Session *s = cls;
967 struct GNUNET_TIME_Relative left;
969 s->timeout_task = NULL;
970 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
971 if (0 != left.rel_value_us)
973 /* not actually our turn yet, but let's at least update
974 the monitor, it may think we're about to die ... */
975 notify_session_monitor (s->plugin,
977 GNUNET_TRANSPORT_SS_UPDATE);
978 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
983 LOG (GNUNET_ERROR_TYPE_DEBUG,
984 "Session %p was idle for %s, disconnecting\n",
986 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
988 /* call session destroy function */
989 tcp_plugin_disconnect_session (s->plugin,
995 * Increment session timeout due to activity.
997 * @param s session to increment timeout for
1000 reschedule_session_timeout (struct Session *s)
1002 GNUNET_assert (NULL != s->timeout_task);
1003 s->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1008 * Create a new session. Also queues a welcome message.
1010 * @param plugin the plugin
1011 * @param address the address to create the session for
1012 * @param scope network scope the address is from
1013 * @param client client to use, reference counter must have already been increased
1014 * @param is_nat this a NAT session, we should wait for a client to
1015 * connect to us from an address, then assign that to
1017 * @return new session object
1019 static struct Session *
1020 create_session (struct Plugin *plugin,
1021 const struct GNUNET_HELLO_Address *address,
1022 enum GNUNET_ATS_Network_Type scope,
1023 struct GNUNET_SERVER_Client *client,
1026 struct Session *session;
1027 struct PendingMessage *pm;
1029 if (GNUNET_YES != is_nat)
1030 GNUNET_assert (NULL != client);
1032 GNUNET_assert (NULL == client);
1034 LOG (GNUNET_ERROR_TYPE_DEBUG,
1035 "Creating new session for peer `%4s' at address %s\n",
1036 GNUNET_i2s (&address->peer),
1037 tcp_plugin_address_to_string (plugin,
1039 address->address_length));
1040 session = GNUNET_new (struct Session);
1041 session->last_activity = GNUNET_TIME_absolute_get ();
1042 session->plugin = plugin;
1043 session->is_nat = is_nat;
1046 session->client = client;
1047 GNUNET_SERVER_client_set_user_context (client,
1050 session->address = GNUNET_HELLO_address_copy (address);
1051 session->target = address->peer;
1052 session->expecting_welcome = GNUNET_YES;
1053 session->scope = scope;
1054 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
1055 sizeof (struct WelcomeMessage));
1056 pm->msg = (const char *) &pm[1];
1057 pm->message_size = sizeof(struct WelcomeMessage);
1059 &plugin->my_welcome,
1060 sizeof(struct WelcomeMessage));
1061 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1062 GNUNET_STATISTICS_update (plugin->env->stats,
1063 gettext_noop ("# bytes currently in TCP buffers"),
1066 GNUNET_CONTAINER_DLL_insert (session->pending_messages_head,
1067 session->pending_messages_tail,
1069 session->msgs_in_queue++;
1070 session->bytes_in_queue += pm->message_size;
1071 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1072 session->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1075 notify_session_monitor (session->plugin,
1077 GNUNET_TRANSPORT_SS_INIT);
1078 if (GNUNET_YES != is_nat)
1080 GNUNET_STATISTICS_update (plugin->env->stats,
1081 gettext_noop ("# TCP sessions active"),
1084 notify_session_monitor (session->plugin,
1086 GNUNET_TRANSPORT_SS_UP);
1090 notify_session_monitor (session->plugin,
1092 GNUNET_TRANSPORT_SS_HANDSHAKE);
1099 * If we have pending messages, ask the server to
1100 * transmit them (schedule the respective tasks, etc.)
1102 * @param session for which session should we do this
1105 process_pending_messages (struct Session *session);
1109 * Function called to notify a client about the socket
1110 * being ready to queue more data. "buf" will be
1111 * NULL and "size" zero if the socket was closed for
1112 * writing in the meantime.
1114 * @param cls closure
1115 * @param size number of bytes available in @a buf
1116 * @param buf where the callee should write the message
1117 * @return number of bytes written to @a buf
1120 do_transmit (void *cls,
1124 struct Session *session = cls;
1125 struct GNUNET_PeerIdentity pid;
1126 struct Plugin *plugin;
1127 struct PendingMessage *pos;
1128 struct PendingMessage *hd;
1129 struct PendingMessage *tl;
1130 struct GNUNET_TIME_Absolute now;
1134 session->transmit_handle = NULL;
1135 plugin = session->plugin;
1138 LOG (GNUNET_ERROR_TYPE_DEBUG,
1139 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
1140 GNUNET_i2s (&session->target));
1141 /* timeout; cancel all messages that have already expired */
1145 now = GNUNET_TIME_absolute_get ();
1146 while ( (NULL != (pos = session->pending_messages_head)) &&
1147 (pos->timeout.abs_value_us <= now.abs_value_us) )
1149 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1150 session->pending_messages_tail,
1152 GNUNET_assert (0 < session->msgs_in_queue);
1153 session->msgs_in_queue--;
1154 GNUNET_assert (pos->message_size <= session->bytes_in_queue);
1155 session->bytes_in_queue -= pos->message_size;
1156 LOG (GNUNET_ERROR_TYPE_DEBUG,
1157 "Failed to transmit %u byte message to `%4s'.\n",
1159 GNUNET_i2s (&session->target));
1160 ret += pos->message_size;
1161 GNUNET_CONTAINER_DLL_insert_after (hd,
1166 /* do this call before callbacks (so that if callbacks destroy
1167 * session, they have a chance to cancel actions done by this
1169 process_pending_messages (session);
1170 pid = session->target;
1171 /* no do callbacks and do not use session again since
1172 * the callbacks may abort the session */
1173 while (NULL != (pos = hd))
1175 GNUNET_CONTAINER_DLL_remove (hd,
1178 if (NULL != pos->transmit_cont)
1179 pos->transmit_cont (pos->transmit_cont_cls,
1186 GNUNET_STATISTICS_update (plugin->env->stats,
1187 gettext_noop ("# bytes currently in TCP buffers"), -(int64_t) ret,
1189 GNUNET_STATISTICS_update (plugin->env->stats,
1190 gettext_noop ("# bytes discarded by TCP (timeout)"),
1194 notify_session_monitor (session->plugin,
1196 GNUNET_TRANSPORT_SS_UPDATE);
1199 /* copy all pending messages that would fit */
1204 while (NULL != (pos = session->pending_messages_head))
1206 if (ret + pos->message_size > size)
1208 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1209 session->pending_messages_tail,
1211 GNUNET_assert (0 < session->msgs_in_queue);
1212 session->msgs_in_queue--;
1213 GNUNET_assert (pos->message_size <= session->bytes_in_queue);
1214 session->bytes_in_queue -= pos->message_size;
1215 GNUNET_assert(size >= pos->message_size);
1216 LOG (GNUNET_ERROR_TYPE_DEBUG,
1217 "Transmitting message of type %u size %u to peer %s at %s\n",
1218 ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type),
1220 GNUNET_i2s (&session->target),
1221 tcp_plugin_address_to_string (session->plugin,
1222 session->address->address,
1223 session->address->address_length));
1224 /* FIXME: this memcpy can be up to 7% of our total runtime */
1228 cbuf += pos->message_size;
1229 ret += pos->message_size;
1230 size -= pos->message_size;
1231 GNUNET_CONTAINER_DLL_insert_tail (hd,
1235 notify_session_monitor (session->plugin,
1237 GNUNET_TRANSPORT_SS_UPDATE);
1238 /* schedule 'continuation' before callbacks so that callbacks that
1239 * cancel everything don't cause us to use a session that no longer
1241 process_pending_messages (session);
1242 session->last_activity = GNUNET_TIME_absolute_get ();
1243 pid = session->target;
1244 /* we'll now call callbacks that may cancel the session; hence
1245 * we should not use 'session' after this point */
1246 while (NULL != (pos = hd))
1248 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
1249 if (NULL != pos->transmit_cont)
1250 pos->transmit_cont (pos->transmit_cont_cls,
1254 pos->message_size); /* FIXME: include TCP overhead */
1257 GNUNET_assert (NULL == hd);
1258 GNUNET_assert (NULL == tl);
1259 GNUNET_STATISTICS_update (plugin->env->stats,
1260 gettext_noop ("# bytes currently in TCP buffers"),
1263 GNUNET_STATISTICS_update (plugin->env->stats,
1264 gettext_noop ("# bytes transmitted via TCP"),
1272 * If we have pending messages, ask the server to
1273 * transmit them (schedule the respective tasks, etc.)
1275 * @param session for which session should we do this
1278 process_pending_messages (struct Session *session)
1280 struct PendingMessage *pm;
1282 GNUNET_assert (NULL != session->client);
1283 if (NULL != session->transmit_handle)
1285 if (NULL == (pm = session->pending_messages_head))
1288 session->transmit_handle
1289 = GNUNET_SERVER_notify_transmit_ready (session->client,
1291 GNUNET_TIME_absolute_get_remaining (pm->timeout),
1298 * Function that can be used by the transport service to transmit
1299 * a message using the plugin. Note that in the case of a
1300 * peer disconnecting, the continuation MUST be called
1301 * prior to the disconnect notification itself. This function
1302 * will be called with this peer's HELLO message to initiate
1303 * a fresh connection to another peer.
1305 * @param cls closure
1306 * @param session which session must be used
1307 * @param msgbuf the message to transmit
1308 * @param msgbuf_size number of bytes in @a msgbuf
1309 * @param priority how important is the message (most plugins will
1310 * ignore message priority and just FIFO)
1311 * @param to how long to wait at most for the transmission (does not
1312 * require plugins to discard the message after the timeout,
1313 * just advisory for the desired delay; most plugins will ignore
1315 * @param cont continuation to call once the message has
1316 * been transmitted (or if the transport is ready
1317 * for the next transmission call; or if the
1318 * peer disconnected...); can be NULL
1319 * @param cont_cls closure for @a cont
1320 * @return number of bytes used (on the physical network, with overheads);
1321 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1322 * and does NOT mean that the message was not transmitted (DV)
1325 tcp_plugin_send (void *cls,
1326 struct Session *session,
1329 unsigned int priority,
1330 struct GNUNET_TIME_Relative to,
1331 GNUNET_TRANSPORT_TransmitContinuation cont,
1334 struct Plugin * plugin = cls;
1335 struct PendingMessage *pm;
1337 /* create new message entry */
1338 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1339 pm->msg = (const char *) &pm[1];
1340 memcpy (&pm[1], msgbuf, msgbuf_size);
1341 pm->message_size = msgbuf_size;
1342 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1343 pm->transmit_cont = cont;
1344 pm->transmit_cont_cls = cont_cls;
1346 LOG(GNUNET_ERROR_TYPE_DEBUG,
1347 "Asked to transmit %u bytes to `%s', added message to list.\n",
1349 GNUNET_i2s (&session->target));
1352 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
1356 GNUNET_assert (NULL != session->client);
1357 GNUNET_SERVER_client_set_timeout (session->client,
1358 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1359 GNUNET_STATISTICS_update (plugin->env->stats,
1360 gettext_noop ("# bytes currently in TCP buffers"),
1364 /* append pm to pending_messages list */
1365 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1366 session->pending_messages_tail,
1368 notify_session_monitor (session->plugin,
1370 GNUNET_TRANSPORT_SS_UPDATE);
1371 session->msgs_in_queue++;
1372 session->bytes_in_queue += pm->message_size;
1373 process_pending_messages (session);
1377 GNUNET_CONTAINER_multipeermap_contains_value (plugin->nat_wait_conns,
1381 LOG (GNUNET_ERROR_TYPE_DEBUG,
1382 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1383 GNUNET_i2s (&session->target));
1384 GNUNET_STATISTICS_update (plugin->env->stats,
1385 gettext_noop ("# bytes currently in TCP buffers"), msgbuf_size,
1387 /* append pm to pending_messages list */
1388 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1389 session->pending_messages_tail,
1391 session->msgs_in_queue++;
1392 session->bytes_in_queue += pm->message_size;
1393 notify_session_monitor (session->plugin,
1395 GNUNET_TRANSPORT_SS_HANDSHAKE);
1398 LOG (GNUNET_ERROR_TYPE_ERROR,
1399 "Invalid session %p\n",
1409 return GNUNET_SYSERR; /* session does not exist here */
1414 * Closure for #session_lookup_it().
1419 * Address we are looking for.
1421 const struct GNUNET_HELLO_Address *address;
1424 * Where to store the session (if we found it).
1426 struct Session *result;
1432 * Look for a session by address.
1434 * @param cls the `struct SessionItCtx`
1436 * @param value a `struct Session`
1437 * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session
1440 session_lookup_it (void *cls,
1441 const struct GNUNET_PeerIdentity *key,
1444 struct SessionItCtx *si_ctx = cls;
1445 struct Session *session = value;
1448 GNUNET_HELLO_address_cmp (si_ctx->address,
1451 si_ctx->result = session;
1457 * Task cleaning up a NAT connection attempt after timeout
1459 * @param cls the `struct Session`
1460 * @param tc scheduler context (unused)
1463 nat_connect_timeout (void *cls,
1464 const struct GNUNET_SCHEDULER_TaskContext *tc)
1466 struct Session *session = cls;
1468 session->nat_connection_timeout = NULL;
1469 LOG (GNUNET_ERROR_TYPE_DEBUG,
1470 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1471 GNUNET_i2s (&session->target),
1472 tcp_plugin_address_to_string (session->plugin,
1473 session->address->address,
1474 session->address->address_length));
1475 tcp_plugin_disconnect_session (session->plugin,
1481 * Function that will be called whenever the transport service wants to
1482 * notify the plugin that a session is still active and in use and
1483 * therefore the session timeout for this session has to be updated
1485 * @param cls closure
1486 * @param peer which peer was the session for
1487 * @param session which session is being updated
1490 tcp_plugin_update_session_timeout (void *cls,
1491 const struct GNUNET_PeerIdentity *peer,
1492 struct Session *session)
1494 reschedule_session_timeout (session);
1499 * Task to signal the server that we can continue
1500 * receiving from the TCP client now.
1502 * @param cls the `struct Session *`
1503 * @param tc task context (unused)
1506 delayed_done (void *cls,
1507 const struct GNUNET_SCHEDULER_TaskContext *tc)
1509 struct Session *session = cls;
1511 session->receive_delay_task = NULL;
1512 reschedule_session_timeout (session);
1513 GNUNET_SERVER_receive_done (session->client,
1519 * Function that will be called whenever the transport service wants to
1520 * notify the plugin that the inbound quota changed and that the plugin
1521 * should update it's delay for the next receive value
1523 * @param cls closure
1524 * @param peer which peer was the session for
1525 * @param session which session is being updated
1526 * @param delay new delay to use for receiving
1529 tcp_plugin_update_inbound_delay (void *cls,
1530 const struct GNUNET_PeerIdentity *peer,
1531 struct Session *session,
1532 struct GNUNET_TIME_Relative delay)
1534 if (NULL == session->receive_delay_task)
1536 LOG (GNUNET_ERROR_TYPE_DEBUG,
1537 "New inbound delay %s\n",
1538 GNUNET_STRINGS_relative_time_to_string (delay,
1540 session->receive_delay = GNUNET_TIME_relative_to_absolute (delay);
1541 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1542 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
1549 * Create a new session to transmit data to the target
1550 * This session will used to send data to this peer and the plugin will
1551 * notify us by calling the env->session_end function
1553 * @param cls closure
1554 * @param address the address to use
1555 * @return the session if the address is valid, NULL otherwise
1557 static struct Session *
1558 tcp_plugin_get_session (void *cls,
1559 const struct GNUNET_HELLO_Address *address)
1561 struct Plugin *plugin = cls;
1562 struct Session *session = NULL;
1566 struct GNUNET_CONNECTION_Handle *sa;
1567 struct sockaddr_in a4;
1568 struct sockaddr_in6 a6;
1569 const struct IPv4TcpAddress *t4;
1570 const struct IPv6TcpAddress *t6;
1571 unsigned int options;
1572 enum GNUNET_ATS_Network_Type net_type;
1573 unsigned int is_natd = GNUNET_NO;
1576 struct GNUNET_NETWORK_Handle *s;
1579 addrlen = address->address_length;
1580 LOG (GNUNET_ERROR_TYPE_DEBUG,
1581 "Trying to get session for `%s' address of peer `%s'\n",
1582 tcp_plugin_address_to_string (plugin,
1584 address->address_length),
1585 GNUNET_i2s (&address->peer));
1587 if (GNUNET_HELLO_address_check_option (address,
1588 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1594 /* look for existing session */
1596 GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
1599 struct SessionItCtx si_ctx;
1601 si_ctx.address = address;
1602 si_ctx.result = NULL;
1603 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1607 if (NULL != si_ctx.result)
1609 session = si_ctx.result;
1610 LOG (GNUNET_ERROR_TYPE_DEBUG,
1611 "Found existing session for `%s' address `%s'\n",
1612 GNUNET_i2s (&address->peer),
1613 tcp_plugin_address_to_string (plugin,
1615 address->address_length));
1620 if (addrlen == sizeof(struct IPv6TcpAddress))
1622 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1623 t6 = address->address;
1624 options = t6->options;
1626 memset (&a6, 0, sizeof(a6));
1627 #if HAVE_SOCKADDR_IN_SIN_LEN
1628 a6.sin6_len = sizeof (a6);
1630 a6.sin6_family = AF_INET6;
1631 a6.sin6_port = t6->t6_port;
1632 if (t6->t6_port == 0)
1633 is_natd = GNUNET_YES;
1634 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1638 else if (addrlen == sizeof(struct IPv4TcpAddress))
1640 GNUNET_assert(NULL != address->address); /* make static analysis happy */
1641 t4 = address->address;
1642 options = t4->options;
1644 memset (&a4, 0, sizeof(a4));
1645 #if HAVE_SOCKADDR_IN_SIN_LEN
1646 a4.sin_len = sizeof (a4);
1648 a4.sin_family = AF_INET;
1649 a4.sin_port = t4->t4_port;
1650 if (t4->t4_port == 0)
1651 is_natd = GNUNET_YES;
1652 a4.sin_addr.s_addr = t4->ipv4_addr;
1658 GNUNET_STATISTICS_update (plugin->env->stats,
1659 gettext_noop ("# requests to create session with invalid address"),
1665 net_type = plugin->env->get_address_type (plugin->env->cls,
1668 GNUNET_break (net_type != GNUNET_ATS_NET_UNSPECIFIED);
1670 if ( (is_natd == GNUNET_YES) &&
1671 (addrlen == sizeof(struct IPv6TcpAddress)) )
1673 /* NAT client only works with IPv4 addresses */
1677 if (plugin->cur_connections >= plugin->max_connections)
1683 if ( (is_natd == GNUNET_YES) &&
1685 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1688 /* Only do one NAT punch attempt per peer identity */
1692 if ( (is_natd == GNUNET_YES) &&
1693 (NULL != plugin->nat) &&
1695 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1698 LOG (GNUNET_ERROR_TYPE_DEBUG,
1699 "Found valid IPv4 NAT address (creating session)!\n");
1700 session = create_session (plugin,
1705 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
1706 &nat_connect_timeout,
1708 GNUNET_assert (GNUNET_OK ==
1709 GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
1712 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1714 LOG (GNUNET_ERROR_TYPE_DEBUG,
1715 "Created NAT WAIT connection to `%4s' at `%s'\n",
1716 GNUNET_i2s (&session->target),
1717 GNUNET_a2s (sb, sbs));
1718 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1724 LOG(GNUNET_ERROR_TYPE_DEBUG,
1725 "Running NAT client for `%4s' at `%s' failed\n",
1726 GNUNET_i2s (&session->target),
1727 GNUNET_a2s (sb, sbs));
1728 tcp_plugin_disconnect_session (plugin,
1734 /* create new outbound session */
1735 if (0 != (options & TCP_OPTIONS_TCP_STEALTH))
1738 s = GNUNET_NETWORK_socket_create (af, SOCK_STREAM, 0);
1741 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
1748 GNUNET_NETWORK_socket_setsockopt (s,
1752 sizeof (struct GNUNET_PeerIdentity))) ||
1754 GNUNET_NETWORK_socket_setsockopt (s,
1756 TCP_STEALTH_INTEGRITY,
1757 &plugin->my_welcome,
1758 sizeof (struct WelcomeMessage))) )
1760 /* TCP STEALTH not supported by kernel */
1761 GNUNET_break (GNUNET_OK ==
1762 GNUNET_NETWORK_socket_close (s));
1767 sa = GNUNET_CONNECTION_connect_socket (s, sb, sbs);
1776 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1780 LOG (GNUNET_ERROR_TYPE_DEBUG,
1781 "Failed to create connection to `%4s' at `%s'\n",
1782 GNUNET_i2s (&address->peer),
1783 GNUNET_a2s (sb, sbs));
1786 LOG (GNUNET_ERROR_TYPE_DEBUG,
1787 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1788 GNUNET_i2s (&address->peer),
1789 GNUNET_a2s (sb, sbs));
1791 session = create_session (plugin,
1794 GNUNET_SERVER_connect_socket (plugin->server,
1797 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1800 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1801 /* Send TCP Welcome */
1802 process_pending_messages (session);
1809 * We have been asked to destroy all connections to a particular peer.
1810 * This function is called on each applicable session and must tear it
1813 * @param cls the `struct Plugin *`
1814 * @param key the peer which the session belongs to (unused)
1815 * @param value the `struct Session`
1816 * @return #GNUNET_YES (continue to iterate)
1819 session_disconnect_it (void *cls,
1820 const struct GNUNET_PeerIdentity *key,
1823 struct Plugin *plugin = cls;
1824 struct Session *session = value;
1826 GNUNET_STATISTICS_update (session->plugin->env->stats,
1827 gettext_noop ("# transport-service disconnect requests for TCP"),
1830 tcp_plugin_disconnect_session (plugin,
1837 * Function that can be called to force a disconnect from the
1838 * specified neighbour. This should also cancel all previously
1839 * scheduled transmissions. Obviously the transmission may have been
1840 * partially completed already, which is OK. The plugin is supposed
1841 * to close the connection (if applicable) and no longer call the
1842 * transmit continuation(s).
1844 * Finally, plugin MUST NOT call the services's receive function to
1845 * notify the service that the connection to the specified target was
1846 * closed after a getting this call.
1848 * @param cls closure
1849 * @param target peer for which the last transmission is
1853 tcp_plugin_disconnect (void *cls,
1854 const struct GNUNET_PeerIdentity *target)
1856 struct Plugin *plugin = cls;
1858 LOG (GNUNET_ERROR_TYPE_DEBUG,
1859 "Disconnecting peer `%4s'\n",
1860 GNUNET_i2s (target));
1861 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1863 &session_disconnect_it,
1865 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns,
1867 &session_disconnect_it,
1873 * We are processing an address pretty printing request and finished
1874 * the IP resolution (if applicable). Append our port and forward the
1875 * result. If called with @a hostname NULL, we are done and should
1876 * clean up the pretty printer (otherwise, there might be multiple
1877 * hostnames for the IP address and we might receive more).
1879 * @param cls the `struct PrettyPrinterContext *`
1880 * @param hostname hostname part of the address
1883 append_port (void *cls,
1884 const char *hostname)
1886 struct PrettyPrinterContext *ppc = cls;
1887 struct Plugin *plugin = ppc->plugin;
1890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1891 "append_port called with hostname `%s'\n",
1893 if (NULL == hostname)
1895 /* Final call, done */
1896 ppc->resolver_handle = NULL;
1897 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
1898 plugin->ppc_dll_tail,
1900 ppc->asc (ppc->asc_cls,
1906 if (GNUNET_YES == ppc->ipv6)
1907 GNUNET_asprintf (&ret,
1914 GNUNET_asprintf (&ret,
1920 ppc->asc (ppc->asc_cls,
1928 * Convert the transports address to a nice, human-readable format.
1930 * @param cls closure with the `struct Plugin`
1931 * @param type name of the transport that generated the address
1932 * @param addr one of the addresses of the host, NULL for the last address
1933 * the specific address format depends on the transport
1934 * @param addrlen length of the @a addr
1935 * @param numeric should (IP) addresses be displayed in numeric form?
1936 * @param timeout after how long should we give up?
1937 * @param asc function to call on each string
1938 * @param asc_cls closure for @a asc
1941 tcp_plugin_address_pretty_printer (void *cls,
1946 struct GNUNET_TIME_Relative timeout,
1947 GNUNET_TRANSPORT_AddressStringCallback asc,
1950 struct Plugin *plugin = cls;
1951 struct PrettyPrinterContext *ppc;
1954 struct sockaddr_in a4;
1955 struct sockaddr_in6 a6;
1956 const struct IPv4TcpAddress *t4;
1957 const struct IPv6TcpAddress *t6;
1961 if (sizeof(struct IPv6TcpAddress) == addrlen)
1964 memset (&a6, 0, sizeof(a6));
1965 a6.sin6_family = AF_INET6;
1966 a6.sin6_port = t6->t6_port;
1967 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1968 port = ntohs (t6->t6_port);
1969 options = ntohl (t6->options);
1973 else if (sizeof(struct IPv4TcpAddress) == addrlen)
1976 memset (&a4, 0, sizeof(a4));
1977 a4.sin_family = AF_INET;
1978 a4.sin_port = t4->t4_port;
1979 a4.sin_addr.s_addr = t4->ipv4_addr;
1980 port = ntohs (t4->t4_port);
1981 options = ntohl (t4->options);
1987 /* invalid address */
1988 LOG (GNUNET_ERROR_TYPE_WARNING,
1989 _("Unexpected address length: %u bytes\n"),
1990 (unsigned int) addrlen);
1991 asc (asc_cls, NULL, GNUNET_SYSERR);
1992 asc (asc_cls, NULL, GNUNET_OK);
1995 ppc = GNUNET_new (struct PrettyPrinterContext);
1996 ppc->plugin = plugin;
1997 if (addrlen == sizeof(struct IPv6TcpAddress))
1998 ppc->ipv6 = GNUNET_YES;
2000 ppc->ipv6 = GNUNET_NO;
2002 ppc->asc_cls = asc_cls;
2004 ppc->options = options;
2005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2006 "Starting DNS reverse lookup\n");
2007 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb,
2012 if (NULL == ppc->resolver_handle)
2018 GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
2019 plugin->ppc_dll_tail,
2025 * Check if the given port is plausible (must be either our listen
2026 * port or our advertised port), or any port if we are behind NAT
2027 * and do not have a port open. If it is neither, we return
2030 * @param plugin global variables
2031 * @param in_port port number to check
2032 * @return #GNUNET_OK if port is either open_port or adv_port
2035 check_port (struct Plugin *plugin,
2038 if ( (in_port == plugin->adv_port) ||
2039 (in_port == plugin->open_port) )
2041 return GNUNET_SYSERR;
2046 * Function that will be called to check if a binary address for this
2047 * plugin is well-formed and corresponds to an address for THIS peer
2048 * (as per our configuration). Naturally, if absolutely necessary,
2049 * plugins can be a bit conservative in their answer, but in general
2050 * plugins should make sure that the address does not redirect
2051 * traffic to a 3rd party that might try to man-in-the-middle our
2054 * @param cls closure, our `struct Plugin *`
2055 * @param addr pointer to the address
2056 * @param addrlen length of @a addr
2057 * @return #GNUNET_OK if this is a plausible address for this peer
2058 * and transport, #GNUNET_SYSERR if not
2061 tcp_plugin_check_address (void *cls,
2065 struct Plugin *plugin = cls;
2066 const struct IPv4TcpAddress *v4;
2067 const struct IPv6TcpAddress *v6;
2069 if ( (addrlen != sizeof(struct IPv4TcpAddress)) &&
2070 (addrlen != sizeof(struct IPv6TcpAddress)) )
2072 GNUNET_break_op (0);
2073 return GNUNET_SYSERR;
2076 if (addrlen == sizeof(struct IPv4TcpAddress))
2078 v4 = (const struct IPv4TcpAddress *) addr;
2079 if (0 != memcmp (&v4->options,
2084 return GNUNET_SYSERR;
2086 if (GNUNET_OK != check_port (plugin,
2087 ntohs (v4->t4_port)))
2088 return GNUNET_SYSERR;
2090 GNUNET_NAT_test_address (plugin->nat,
2092 sizeof (struct in_addr)))
2093 return GNUNET_SYSERR;
2097 v6 = (const struct IPv6TcpAddress *) addr;
2098 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
2100 GNUNET_break_op (0);
2101 return GNUNET_SYSERR;
2103 if (0 != memcmp (&v6->options,
2108 return GNUNET_SYSERR;
2110 if (GNUNET_OK != check_port (plugin,
2111 ntohs (v6->t6_port)))
2112 return GNUNET_SYSERR;
2114 GNUNET_NAT_test_address (plugin->nat,
2116 sizeof(struct in6_addr)))
2117 return GNUNET_SYSERR;
2124 * We've received a nat probe from this peer via TCP. Finish
2125 * creating the client session and resume sending of queued
2128 * @param cls closure
2129 * @param client identification of the client
2130 * @param message the actual message
2133 handle_tcp_nat_probe (void *cls,
2134 struct GNUNET_SERVER_Client *client,
2135 const struct GNUNET_MessageHeader *message)
2137 struct Plugin *plugin = cls;
2138 struct Session *session;
2139 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
2142 struct IPv4TcpAddress *t4;
2143 struct IPv6TcpAddress *t6;
2144 const struct sockaddr_in *s4;
2145 const struct sockaddr_in6 *s6;
2147 LOG (GNUNET_ERROR_TYPE_DEBUG,
2148 "Received NAT probe\n");
2149 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
2150 * a connection to this peer by running gnunet-nat-client. This peer
2151 * received the punch message and now wants us to use the new connection
2152 * as the default for that peer. Do so and then send a WELCOME message
2153 * so we can really be connected!
2155 if (ntohs (message->size) != sizeof(struct TCP_NAT_ProbeMessage))
2158 GNUNET_SERVER_receive_done (client,
2163 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
2164 if (0 == memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
2165 sizeof(struct GNUNET_PeerIdentity)))
2167 /* refuse connections from ourselves */
2168 GNUNET_SERVER_receive_done (client,
2173 session = GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
2174 &tcp_nat_probe->clientIdentity);
2175 if (NULL == session)
2177 LOG (GNUNET_ERROR_TYPE_DEBUG,
2178 "Did NOT find session for NAT probe!\n");
2179 GNUNET_SERVER_receive_done (client,
2183 LOG (GNUNET_ERROR_TYPE_DEBUG,
2184 "Found session for NAT probe!\n");
2186 if (NULL != session->nat_connection_timeout)
2188 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
2189 session->nat_connection_timeout = NULL;
2193 GNUNET_SERVER_client_get_address (client,
2198 GNUNET_SERVER_receive_done (client,
2200 tcp_plugin_disconnect_session (plugin,
2204 GNUNET_assert (GNUNET_YES ==
2205 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
2206 &tcp_nat_probe->clientIdentity,
2208 GNUNET_SERVER_client_set_user_context (client,
2210 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2213 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2214 session->last_activity = GNUNET_TIME_absolute_get ();
2215 LOG (GNUNET_ERROR_TYPE_DEBUG,
2216 "Found address `%s' for incoming connection\n",
2217 GNUNET_a2s (vaddr, alen));
2218 switch (((const struct sockaddr *) vaddr)->sa_family)
2222 t4 = GNUNET_new (struct IPv4TcpAddress);
2223 t4->options = htonl (TCP_OPTIONS_NONE);
2224 t4->t4_port = s4->sin_port;
2225 t4->ipv4_addr = s4->sin_addr.s_addr;
2226 session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
2229 sizeof(struct IPv4TcpAddress),
2230 GNUNET_HELLO_ADDRESS_INFO_NONE);
2234 t6 = GNUNET_new (struct IPv6TcpAddress);
2235 t6->options = htonl (TCP_OPTIONS_NONE);
2236 t6->t6_port = s6->sin6_port;
2237 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2238 session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
2241 sizeof(struct IPv6TcpAddress),
2242 GNUNET_HELLO_ADDRESS_INFO_NONE);
2246 LOG(GNUNET_ERROR_TYPE_DEBUG,
2247 "Bad address for incoming connection!\n");
2249 GNUNET_SERVER_receive_done (client,
2251 tcp_plugin_disconnect_session (plugin,
2255 GNUNET_free (vaddr);
2256 GNUNET_break (NULL == session->client);
2257 session->client = client;
2258 GNUNET_STATISTICS_update (plugin->env->stats,
2259 gettext_noop ("# TCP sessions active"),
2262 process_pending_messages (session);
2263 GNUNET_SERVER_receive_done (client,
2269 * We've received a welcome from this peer via TCP. Possibly create a
2270 * fresh client record and send back our welcome.
2272 * @param cls closure
2273 * @param client identification of the client
2274 * @param message the actual message
2277 handle_tcp_welcome (void *cls,
2278 struct GNUNET_SERVER_Client *client,
2279 const struct GNUNET_MessageHeader *message)
2281 struct Plugin *plugin = cls;
2282 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2283 struct GNUNET_HELLO_Address *address;
2284 struct Session *session;
2287 struct IPv4TcpAddress t4;
2288 struct IPv6TcpAddress t6;
2289 const struct sockaddr_in *s4;
2290 const struct sockaddr_in6 *s6;
2292 if (0 == memcmp (&wm->clientIdentity,
2293 plugin->env->my_identity,
2294 sizeof(struct GNUNET_PeerIdentity)))
2296 /* refuse connections from ourselves */
2297 GNUNET_SERVER_receive_done (client,
2300 GNUNET_SERVER_client_get_address (client,
2304 LOG (GNUNET_ERROR_TYPE_INFO,
2305 "Received WELCOME message from my own identity `%4s' on address `%s'\n",
2306 GNUNET_i2s (&wm->clientIdentity),
2307 GNUNET_a2s (vaddr, alen));
2313 LOG(GNUNET_ERROR_TYPE_DEBUG,
2314 "Received WELCOME message from `%4s' %p\n",
2315 GNUNET_i2s (&wm->clientIdentity),
2317 GNUNET_STATISTICS_update (plugin->env->stats,
2318 gettext_noop ("# TCP WELCOME messages received"),
2321 session = lookup_session_by_client (plugin, client);
2322 if (NULL != session)
2325 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2327 LOG (GNUNET_ERROR_TYPE_DEBUG,
2328 "Found existing session %p for peer `%s'\n",
2330 GNUNET_a2s (vaddr, alen));
2331 GNUNET_free (vaddr);
2337 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2339 if (alen == sizeof(struct sockaddr_in))
2342 memset (&t4, '\0', sizeof (t4));
2343 t4.options = htonl (TCP_OPTIONS_NONE);
2344 t4.t4_port = s4->sin_port;
2345 t4.ipv4_addr = s4->sin_addr.s_addr;
2346 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2350 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2352 else if (alen == sizeof(struct sockaddr_in6))
2355 memset (&t6, '\0', sizeof (t6));
2356 t6.options = htonl (TCP_OPTIONS_NONE);
2357 t6.t6_port = s6->sin6_port;
2358 memcpy (&t6.ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2359 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2363 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2368 GNUNET_free_non_null (vaddr);
2369 GNUNET_SERVER_receive_done (client,
2373 session = create_session (plugin,
2375 plugin->env->get_address_type (plugin->env->cls,
2380 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != session->scope);
2381 GNUNET_HELLO_address_free (address);
2382 LOG (GNUNET_ERROR_TYPE_DEBUG,
2383 "Creating new%s session %p for peer `%s' client %p\n",
2384 GNUNET_HELLO_address_check_option (session->address,
2385 GNUNET_HELLO_ADDRESS_INFO_INBOUND)
2388 tcp_plugin_address_to_string (plugin,
2389 session->address->address,
2390 session->address->address_length),
2392 GNUNET_free (vaddr);
2393 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2396 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2397 /* Notify transport and ATS about new session */
2398 plugin->env->session_start (plugin->env->cls,
2405 LOG(GNUNET_ERROR_TYPE_DEBUG,
2406 "Did not obtain TCP socket address for incoming connection\n");
2408 GNUNET_SERVER_receive_done (client,
2414 if (session->expecting_welcome != GNUNET_YES)
2417 GNUNET_SERVER_receive_done (client,
2422 session->last_activity = GNUNET_TIME_absolute_get ();
2423 session->expecting_welcome = GNUNET_NO;
2425 process_pending_messages (session);
2426 GNUNET_SERVER_client_set_timeout (client,
2427 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2428 GNUNET_SERVER_receive_done (client,
2434 * We've received data for this peer via TCP. Unbox,
2435 * compute latency and forward.
2437 * @param cls closure
2438 * @param client identification of the client
2439 * @param message the actual message
2442 handle_tcp_data (void *cls,
2443 struct GNUNET_SERVER_Client *client,
2444 const struct GNUNET_MessageHeader *message)
2446 struct Plugin *plugin = cls;
2447 struct Session *session;
2448 struct GNUNET_TIME_Relative delay;
2451 type = ntohs (message->type);
2452 if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2453 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
2455 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2456 GNUNET_SERVER_receive_done (client,
2460 session = lookup_session_by_client (plugin, client);
2461 if (NULL == session)
2463 /* No inbound session found */
2467 GNUNET_SERVER_client_get_address (client,
2470 LOG (GNUNET_ERROR_TYPE_ERROR,
2471 "Received unexpected %u bytes of type %u from `%s'\n",
2472 (unsigned int) ntohs (message->size),
2473 (unsigned int) ntohs (message->type),
2477 GNUNET_SERVER_receive_done (client,
2479 GNUNET_free_non_null (vaddr);
2482 if (GNUNET_YES == session->expecting_welcome)
2484 /* Session is expecting WELCOME message */
2488 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2489 LOG (GNUNET_ERROR_TYPE_ERROR,
2490 "Received unexpected %u bytes of type %u from `%s'\n",
2491 (unsigned int) ntohs (message->size),
2492 (unsigned int) ntohs (message->type),
2493 GNUNET_a2s (vaddr, alen));
2495 GNUNET_SERVER_receive_done (client,
2497 GNUNET_free_non_null (vaddr);
2501 session->last_activity = GNUNET_TIME_absolute_get ();
2502 LOG (GNUNET_ERROR_TYPE_DEBUG,
2503 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2504 (unsigned int) ntohs (message->size),
2505 (unsigned int) ntohs (message->type),
2506 GNUNET_i2s (&session->target));
2508 GNUNET_STATISTICS_update (plugin->env->stats,
2509 gettext_noop ("# bytes received via TCP"),
2510 ntohs (message->size),
2513 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2516 delay = plugin->env->receive (plugin->env->cls,
2520 reschedule_session_timeout (session);
2521 if (0 == delay.rel_value_us)
2523 GNUNET_SERVER_receive_done (client,
2528 LOG (GNUNET_ERROR_TYPE_DEBUG,
2529 "Throttling receiving from `%s' for %s\n",
2530 GNUNET_i2s (&session->target),
2531 GNUNET_STRINGS_relative_time_to_string (delay,
2533 GNUNET_SERVER_disable_receive_done_warning (client);
2534 GNUNET_assert (NULL == session->receive_delay_task);
2535 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
2543 * Function called whenever a peer is connected on the "SERVER" level.
2544 * Increments number of active connections and suspends server if we
2545 * have reached the limit.
2547 * @param cls closure
2548 * @param client identification of the client
2551 connect_notify (void *cls,
2552 struct GNUNET_SERVER_Client *client)
2554 struct Plugin *plugin = cls;
2558 plugin->cur_connections++;
2559 GNUNET_STATISTICS_set (plugin->env->stats,
2560 gettext_noop ("# TCP server connections active"),
2561 plugin->cur_connections,
2563 GNUNET_STATISTICS_update (plugin->env->stats,
2564 gettext_noop ("# TCP server connect events"),
2567 if (plugin->cur_connections != plugin->max_connections)
2569 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2570 _("TCP connection limit reached, suspending server\n"));
2571 GNUNET_STATISTICS_update (plugin->env->stats,
2572 gettext_noop ("# TCP service suspended"),
2575 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2580 * Function called whenever a peer is disconnected on the "SERVER"
2581 * level. Cleans up the connection, decrements number of active
2582 * connections and if applicable resumes listening.
2584 * @param cls closure
2585 * @param client identification of the client
2588 disconnect_notify (void *cls,
2589 struct GNUNET_SERVER_Client *client)
2591 struct Plugin *plugin = cls;
2592 struct Session *session;
2596 GNUNET_assert (plugin->cur_connections >= 1);
2597 plugin->cur_connections--;
2598 session = lookup_session_by_client (plugin,
2600 if (NULL == session)
2601 return; /* unknown, nothing to do */
2602 LOG (GNUNET_ERROR_TYPE_DEBUG,
2603 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2604 GNUNET_i2s (&session->target),
2605 tcp_plugin_address_to_string (session->plugin,
2606 session->address->address,
2607 session->address->address_length));
2609 if (plugin->cur_connections == plugin->max_connections)
2611 GNUNET_STATISTICS_update (session->plugin->env->stats,
2612 gettext_noop ("# TCP service resumed"),
2615 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2617 GNUNET_STATISTICS_set (plugin->env->stats,
2618 gettext_noop ("# TCP server connections active"),
2619 plugin->cur_connections,
2621 GNUNET_STATISTICS_update (session->plugin->env->stats,
2622 gettext_noop ("# network-level TCP disconnect events"),
2625 tcp_plugin_disconnect_session (plugin,
2631 * We can now send a probe message, copy into buffer to really send.
2633 * @param cls closure, a `struct TCPProbeContext`
2634 * @param size max size to copy
2635 * @param buf buffer to copy message to
2636 * @return number of bytes copied into @a buf
2639 notify_send_probe (void *cls,
2643 struct TCPProbeContext *tcp_probe_ctx = cls;
2644 struct Plugin *plugin = tcp_probe_ctx->plugin;
2647 tcp_probe_ctx->transmit_handle = NULL;
2648 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
2653 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2654 GNUNET_free(tcp_probe_ctx);
2657 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2659 &tcp_probe_ctx->message,
2660 sizeof(tcp_probe_ctx->message));
2661 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2662 tcp_probe_ctx->sock);
2663 ret = sizeof(tcp_probe_ctx->message);
2664 GNUNET_free (tcp_probe_ctx);
2670 * Function called by the NAT subsystem suggesting another peer wants
2671 * to connect to us via connection reversal. Try to connect back to the
2674 * @param cls closure
2675 * @param addr address to try
2676 * @param addrlen number of bytes in @a addr
2679 try_connection_reversal (void *cls,
2680 const struct sockaddr *addr,
2683 struct Plugin *plugin = cls;
2684 struct GNUNET_CONNECTION_Handle *sock;
2685 struct TCPProbeContext *tcp_probe_ctx;
2688 * We have received an ICMP response, ostensibly from a peer
2689 * that wants to connect to us! Send a message to establish a connection.
2691 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET,
2696 /* failed for some odd reason (out of sockets?); ignore attempt */
2700 tcp_probe_ctx = GNUNET_new (struct TCPProbeContext);
2701 tcp_probe_ctx->message.header.size
2702 = htons (sizeof (struct TCP_NAT_ProbeMessage));
2703 tcp_probe_ctx->message.header.type
2704 = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2705 tcp_probe_ctx->message.clientIdentity
2706 = *plugin->env->my_identity;
2707 tcp_probe_ctx->plugin = plugin;
2708 tcp_probe_ctx->sock = sock;
2709 GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
2712 tcp_probe_ctx->transmit_handle
2713 = GNUNET_CONNECTION_notify_transmit_ready (sock,
2714 ntohs (tcp_probe_ctx->message.header.size),
2715 GNUNET_TIME_UNIT_FOREVER_REL,
2722 * Function obtain the network type for a session
2724 * @param cls closure (`struct Plugin *`)
2725 * @param session the session
2726 * @return the network type in HBO or #GNUNET_SYSERR
2728 static enum GNUNET_ATS_Network_Type
2729 tcp_plugin_get_network (void *cls,
2730 struct Session *session)
2732 return session->scope;
2737 * Return information about the given session to the
2740 * @param cls the `struct Plugin` with the monitor callback (`sic`)
2741 * @param peer peer we send information about
2742 * @param value our `struct Session` to send information about
2743 * @return #GNUNET_OK (continue to iterate)
2746 send_session_info_iter (void *cls,
2747 const struct GNUNET_PeerIdentity *peer,
2750 struct Plugin *plugin = cls;
2751 struct Session *session = value;
2753 notify_session_monitor (plugin,
2755 GNUNET_TRANSPORT_SS_INIT);
2756 /* FIXME: cannot tell if this is up or not from current
2758 notify_session_monitor (plugin,
2760 GNUNET_TRANSPORT_SS_UP);
2766 * Begin monitoring sessions of a plugin. There can only
2767 * be one active monitor per plugin (i.e. if there are
2768 * multiple monitors, the transport service needs to
2769 * multiplex the generated events over all of them).
2771 * @param cls closure of the plugin
2772 * @param sic callback to invoke, NULL to disable monitor;
2773 * plugin will being by iterating over all active
2774 * sessions immediately and then enter monitor mode
2775 * @param sic_cls closure for @a sic
2778 tcp_plugin_setup_monitor (void *cls,
2779 GNUNET_TRANSPORT_SessionInfoCallback sic,
2782 struct Plugin *plugin = cls;
2785 plugin->sic_cls = sic_cls;
2788 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2789 &send_session_info_iter,
2791 /* signal end of first iteration */
2792 sic (sic_cls, NULL, NULL);
2798 * Entry point for the plugin.
2800 * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *`
2801 * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error
2804 libgnunet_plugin_transport_tcp_init (void *cls)
2806 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2807 { &handle_tcp_welcome, NULL,
2808 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2809 sizeof(struct WelcomeMessage) },
2810 { &handle_tcp_nat_probe, NULL,
2811 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2812 sizeof(struct TCP_NAT_ProbeMessage) },
2813 { &handle_tcp_data, NULL,
2814 GNUNET_MESSAGE_TYPE_ALL, 0 },
2815 { NULL, NULL, 0, 0 }
2817 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2818 struct GNUNET_TRANSPORT_PluginFunctions *api;
2819 struct Plugin *plugin;
2820 struct GNUNET_SERVICE_Context *service;
2821 unsigned long long aport;
2822 unsigned long long bport;
2823 unsigned long long max_connections;
2825 struct GNUNET_TIME_Relative idle_timeout;
2827 struct GNUNET_NETWORK_Handle *const*lsocks;
2831 struct sockaddr **addrs;
2832 socklen_t *addrlens;
2834 if (NULL == env->receive)
2836 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2837 initialze the plugin or the API */
2838 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2840 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2841 api->address_to_string = &tcp_plugin_address_to_string;
2842 api->string_to_address = &tcp_plugin_string_to_address;
2846 GNUNET_assert (NULL != env->cfg);
2848 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2852 max_connections = 128;
2856 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2860 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2861 "ADVERTISED-PORT", &aport)) &&
2864 LOG(GNUNET_ERROR_TYPE_ERROR,
2865 _("Require valid port number for service `%s' in configuration!\n"),
2875 service = GNUNET_SERVICE_start ("transport-tcp",
2877 GNUNET_SERVICE_OPTION_NONE);
2878 if (NULL == service)
2880 LOG (GNUNET_ERROR_TYPE_WARNING,
2881 _("Failed to start service.\n"));
2889 plugin = GNUNET_new (struct Plugin);
2890 plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections,
2892 plugin->max_connections = max_connections;
2893 plugin->open_port = bport;
2894 plugin->adv_port = aport;
2896 plugin->my_welcome.header.size = htons (sizeof(struct WelcomeMessage));
2897 plugin->my_welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
2898 plugin->my_welcome.clientIdentity = *plugin->env->my_identity;
2900 if ( (NULL != service) &&
2902 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2907 plugin->myoptions |= TCP_OPTIONS_TCP_STEALTH;
2908 lsocks = GNUNET_SERVICE_get_listen_sockets (service);
2911 uint32_t len = sizeof (struct WelcomeMessage);
2913 for (i=0;NULL!=lsocks[i];i++)
2916 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2920 sizeof (struct GNUNET_PeerIdentity))) ||
2922 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2924 TCP_STEALTH_INTEGRITY_LEN,
2928 /* TCP STEALTH not supported by kernel */
2929 GNUNET_assert (0 == i);
2930 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2931 _("TCP_STEALTH not supported on this platform.\n"));
2937 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2938 _("TCP_STEALTH not supported on this platform.\n"));
2943 if ( (NULL != service) &&
2946 GNUNET_SERVICE_get_server_addresses ("transport-tcp",
2951 for (ret = ret_s-1; ret >= 0; ret--)
2952 LOG (GNUNET_ERROR_TYPE_INFO,
2953 "Binding to address `%s'\n",
2954 GNUNET_a2s (addrs[ret], addrlens[ret]));
2956 = GNUNET_NAT_register (env->cfg,
2959 (unsigned int) ret_s,
2960 (const struct sockaddr **) addrs, addrlens,
2961 &tcp_nat_port_map_callback,
2962 &try_connection_reversal,
2964 for (ret = ret_s -1; ret >= 0; ret--)
2965 GNUNET_free (addrs[ret]);
2966 GNUNET_free_non_null (addrs);
2967 GNUNET_free_non_null (addrlens);
2971 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2978 &try_connection_reversal,
2981 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2983 api->send = &tcp_plugin_send;
2984 api->get_session = &tcp_plugin_get_session;
2985 api->disconnect_session = &tcp_plugin_disconnect_session;
2986 api->query_keepalive_factor = &tcp_plugin_query_keepalive_factor;
2987 api->disconnect_peer = &tcp_plugin_disconnect;
2988 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2989 api->check_address = &tcp_plugin_check_address;
2990 api->address_to_string = &tcp_plugin_address_to_string;
2991 api->string_to_address = &tcp_plugin_string_to_address;
2992 api->get_network = &tcp_plugin_get_network;
2993 api->update_session_timeout = &tcp_plugin_update_session_timeout;
2994 api->update_inbound_delay = &tcp_plugin_update_inbound_delay;
2995 api->setup_monitor = &tcp_plugin_setup_monitor;
2996 plugin->service = service;
2997 if (NULL != service)
2999 plugin->server = GNUNET_SERVICE_get_server (service);
3004 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3009 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3015 = GNUNET_SERVER_create_with_sockets (NULL,
3021 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
3022 memcpy (plugin->handlers, my_handlers, sizeof(my_handlers));
3023 for (i = 0;i < sizeof(my_handlers) / sizeof(struct GNUNET_SERVER_MessageHandler);i++)
3024 plugin->handlers[i].callback_cls = plugin;
3026 GNUNET_SERVER_add_handlers (plugin->server,
3028 GNUNET_SERVER_connect_notify (plugin->server,
3031 GNUNET_SERVER_disconnect_notify (plugin->server,
3034 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16,
3037 LOG (GNUNET_ERROR_TYPE_INFO,
3038 _("TCP transport listening on port %llu\n"),
3041 LOG (GNUNET_ERROR_TYPE_INFO,
3042 _("TCP transport not listening on any port (client only)\n"));
3043 if ( (aport != bport) &&
3045 LOG (GNUNET_ERROR_TYPE_INFO,
3046 _("TCP transport advertises itself as being on port %llu\n"),
3048 /* Initially set connections to 0 */
3049 GNUNET_STATISTICS_set (plugin->env->stats,
3050 gettext_noop ("# TCP sessions active"),
3056 if (NULL != plugin->nat)
3057 GNUNET_NAT_unregister (plugin->nat);
3058 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3059 if (NULL != service)
3060 GNUNET_SERVICE_stop (service);
3061 GNUNET_free (plugin);
3062 GNUNET_free_non_null (api);
3068 * Exit point from the plugin.
3070 * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions`
3074 libgnunet_plugin_transport_tcp_done (void *cls)
3076 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3077 struct Plugin *plugin = api->cls;
3078 struct TCPProbeContext *tcp_probe;
3079 struct PrettyPrinterContext *cur;
3080 struct PrettyPrinterContext *next;
3087 LOG (GNUNET_ERROR_TYPE_DEBUG,
3088 "Shutting down TCP plugin\n");
3090 /* Removing leftover sessions */
3091 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
3092 &session_disconnect_it,
3094 /* Removing leftover NAT sessions */
3095 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
3096 &session_disconnect_it,
3099 for (cur = plugin->ppc_dll_head; NULL != cur; cur = next)
3102 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
3103 plugin->ppc_dll_tail,
3105 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3106 cur->asc (cur->asc_cls,
3112 if (NULL != plugin->service)
3113 GNUNET_SERVICE_stop (plugin->service);
3115 GNUNET_SERVER_destroy (plugin->server);
3116 GNUNET_free (plugin->handlers);
3117 if (NULL != plugin->nat)
3118 GNUNET_NAT_unregister (plugin->nat);
3119 while (NULL != (tcp_probe = plugin->probe_head))
3121 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
3124 GNUNET_CONNECTION_destroy (tcp_probe->sock);
3125 GNUNET_free (tcp_probe);
3127 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
3128 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3129 GNUNET_break (0 == plugin->cur_connections);
3130 GNUNET_free (plugin);
3135 /* end of plugin_transport_tcp.c */