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., 59 Temple Place - Suite 330,
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_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 if (NULL == hostname)
1892 /* Final call, done */
1893 ppc->resolver_handle = NULL;
1894 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
1895 plugin->ppc_dll_tail,
1897 ppc->asc (ppc->asc_cls,
1903 if (GNUNET_YES == ppc->ipv6)
1904 GNUNET_asprintf (&ret,
1911 GNUNET_asprintf (&ret,
1917 ppc->asc (ppc->asc_cls,
1925 * Convert the transports address to a nice, human-readable format.
1927 * @param cls closure with the `struct Plugin`
1928 * @param type name of the transport that generated the address
1929 * @param addr one of the addresses of the host, NULL for the last address
1930 * the specific address format depends on the transport
1931 * @param addrlen length of the @a addr
1932 * @param numeric should (IP) addresses be displayed in numeric form?
1933 * @param timeout after how long should we give up?
1934 * @param asc function to call on each string
1935 * @param asc_cls closure for @a asc
1938 tcp_plugin_address_pretty_printer (void *cls,
1943 struct GNUNET_TIME_Relative timeout,
1944 GNUNET_TRANSPORT_AddressStringCallback asc,
1947 struct Plugin *plugin = cls;
1948 struct PrettyPrinterContext *ppc;
1951 struct sockaddr_in a4;
1952 struct sockaddr_in6 a6;
1953 const struct IPv4TcpAddress *t4;
1954 const struct IPv6TcpAddress *t6;
1958 if (sizeof(struct IPv6TcpAddress) == addrlen)
1961 memset (&a6, 0, sizeof(a6));
1962 a6.sin6_family = AF_INET6;
1963 a6.sin6_port = t6->t6_port;
1964 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1965 port = ntohs (t6->t6_port);
1966 options = ntohl (t6->options);
1970 else if (sizeof(struct IPv4TcpAddress) == addrlen)
1973 memset (&a4, 0, sizeof(a4));
1974 a4.sin_family = AF_INET;
1975 a4.sin_port = t4->t4_port;
1976 a4.sin_addr.s_addr = t4->ipv4_addr;
1977 port = ntohs (t4->t4_port);
1978 options = ntohl (t4->options);
1984 /* invalid address */
1985 asc (asc_cls, NULL, GNUNET_SYSERR);
1986 asc (asc_cls, NULL, GNUNET_OK);
1989 ppc = GNUNET_new (struct PrettyPrinterContext);
1990 ppc->plugin = plugin;
1991 if (addrlen == sizeof(struct IPv6TcpAddress))
1992 ppc->ipv6 = GNUNET_YES;
1994 ppc->ipv6 = GNUNET_NO;
1996 ppc->asc_cls = asc_cls;
1998 ppc->options = options;
1999 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb,
2004 if (NULL == ppc->resolver_handle)
2010 GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
2011 plugin->ppc_dll_tail,
2017 * Check if the given port is plausible (must be either our listen
2018 * port or our advertised port), or any port if we are behind NAT
2019 * and do not have a port open. If it is neither, we return
2022 * @param plugin global variables
2023 * @param in_port port number to check
2024 * @return #GNUNET_OK if port is either open_port or adv_port
2027 check_port (struct Plugin *plugin,
2030 if ( (in_port == plugin->adv_port) ||
2031 (in_port == plugin->open_port) )
2033 return GNUNET_SYSERR;
2038 * Function that will be called to check if a binary address for this
2039 * plugin is well-formed and corresponds to an address for THIS peer
2040 * (as per our configuration). Naturally, if absolutely necessary,
2041 * plugins can be a bit conservative in their answer, but in general
2042 * plugins should make sure that the address does not redirect
2043 * traffic to a 3rd party that might try to man-in-the-middle our
2046 * @param cls closure, our `struct Plugin *`
2047 * @param addr pointer to the address
2048 * @param addrlen length of @a addr
2049 * @return #GNUNET_OK if this is a plausible address for this peer
2050 * and transport, #GNUNET_SYSERR if not
2053 tcp_plugin_check_address (void *cls,
2057 struct Plugin *plugin = cls;
2058 const struct IPv4TcpAddress *v4;
2059 const struct IPv6TcpAddress *v6;
2061 if ( (addrlen != sizeof(struct IPv4TcpAddress)) &&
2062 (addrlen != sizeof(struct IPv6TcpAddress)) )
2064 GNUNET_break_op (0);
2065 return GNUNET_SYSERR;
2068 if (addrlen == sizeof(struct IPv4TcpAddress))
2070 v4 = (const struct IPv4TcpAddress *) addr;
2071 if (0 != memcmp (&v4->options,
2076 return GNUNET_SYSERR;
2078 if (GNUNET_OK != check_port (plugin,
2079 ntohs (v4->t4_port)))
2080 return GNUNET_SYSERR;
2082 GNUNET_NAT_test_address (plugin->nat,
2084 sizeof (struct in_addr)))
2085 return GNUNET_SYSERR;
2089 v6 = (const struct IPv6TcpAddress *) addr;
2090 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
2092 GNUNET_break_op (0);
2093 return GNUNET_SYSERR;
2095 if (0 != memcmp (&v6->options,
2100 return GNUNET_SYSERR;
2102 if (GNUNET_OK != check_port (plugin,
2103 ntohs (v6->t6_port)))
2104 return GNUNET_SYSERR;
2106 GNUNET_NAT_test_address (plugin->nat,
2108 sizeof(struct in6_addr)))
2109 return GNUNET_SYSERR;
2116 * We've received a nat probe from this peer via TCP. Finish
2117 * creating the client session and resume sending of queued
2120 * @param cls closure
2121 * @param client identification of the client
2122 * @param message the actual message
2125 handle_tcp_nat_probe (void *cls,
2126 struct GNUNET_SERVER_Client *client,
2127 const struct GNUNET_MessageHeader *message)
2129 struct Plugin *plugin = cls;
2130 struct Session *session;
2131 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
2134 struct IPv4TcpAddress *t4;
2135 struct IPv6TcpAddress *t6;
2136 const struct sockaddr_in *s4;
2137 const struct sockaddr_in6 *s6;
2139 LOG (GNUNET_ERROR_TYPE_DEBUG,
2140 "Received NAT probe\n");
2141 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
2142 * a connection to this peer by running gnunet-nat-client. This peer
2143 * received the punch message and now wants us to use the new connection
2144 * as the default for that peer. Do so and then send a WELCOME message
2145 * so we can really be connected!
2147 if (ntohs (message->size) != sizeof(struct TCP_NAT_ProbeMessage))
2150 GNUNET_SERVER_receive_done (client,
2155 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
2156 if (0 == memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
2157 sizeof(struct GNUNET_PeerIdentity)))
2159 /* refuse connections from ourselves */
2160 GNUNET_SERVER_receive_done (client,
2165 session = GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
2166 &tcp_nat_probe->clientIdentity);
2167 if (NULL == session)
2169 LOG (GNUNET_ERROR_TYPE_DEBUG,
2170 "Did NOT find session for NAT probe!\n");
2171 GNUNET_SERVER_receive_done (client,
2175 LOG (GNUNET_ERROR_TYPE_DEBUG,
2176 "Found session for NAT probe!\n");
2178 if (NULL != session->nat_connection_timeout)
2180 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
2181 session->nat_connection_timeout = NULL;
2185 GNUNET_SERVER_client_get_address (client,
2190 GNUNET_SERVER_receive_done (client,
2192 tcp_plugin_disconnect_session (plugin,
2196 GNUNET_assert (GNUNET_YES ==
2197 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
2198 &tcp_nat_probe->clientIdentity,
2200 GNUNET_SERVER_client_set_user_context (client,
2202 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2205 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2206 session->last_activity = GNUNET_TIME_absolute_get ();
2207 LOG (GNUNET_ERROR_TYPE_DEBUG,
2208 "Found address `%s' for incoming connection\n",
2209 GNUNET_a2s (vaddr, alen));
2210 switch (((const struct sockaddr *) vaddr)->sa_family)
2214 t4 = GNUNET_new (struct IPv4TcpAddress);
2215 t4->options = htonl (TCP_OPTIONS_NONE);
2216 t4->t4_port = s4->sin_port;
2217 t4->ipv4_addr = s4->sin_addr.s_addr;
2218 session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
2221 sizeof(struct IPv4TcpAddress),
2222 GNUNET_HELLO_ADDRESS_INFO_NONE);
2226 t6 = GNUNET_new (struct IPv6TcpAddress);
2227 t6->options = htonl (TCP_OPTIONS_NONE);
2228 t6->t6_port = s6->sin6_port;
2229 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2230 session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
2233 sizeof(struct IPv6TcpAddress),
2234 GNUNET_HELLO_ADDRESS_INFO_NONE);
2238 LOG(GNUNET_ERROR_TYPE_DEBUG,
2239 "Bad address for incoming connection!\n");
2241 GNUNET_SERVER_receive_done (client,
2243 tcp_plugin_disconnect_session (plugin,
2247 GNUNET_free (vaddr);
2248 GNUNET_break (NULL == session->client);
2249 session->client = client;
2250 GNUNET_STATISTICS_update (plugin->env->stats,
2251 gettext_noop ("# TCP sessions active"),
2254 process_pending_messages (session);
2255 GNUNET_SERVER_receive_done (client,
2261 * We've received a welcome from this peer via TCP. Possibly create a
2262 * fresh client record and send back our welcome.
2264 * @param cls closure
2265 * @param client identification of the client
2266 * @param message the actual message
2269 handle_tcp_welcome (void *cls,
2270 struct GNUNET_SERVER_Client *client,
2271 const struct GNUNET_MessageHeader *message)
2273 struct Plugin *plugin = cls;
2274 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2275 struct GNUNET_HELLO_Address *address;
2276 struct Session *session;
2279 struct IPv4TcpAddress t4;
2280 struct IPv6TcpAddress t6;
2281 const struct sockaddr_in *s4;
2282 const struct sockaddr_in6 *s6;
2284 if (0 == memcmp (&wm->clientIdentity,
2285 plugin->env->my_identity,
2286 sizeof(struct GNUNET_PeerIdentity)))
2288 /* refuse connections from ourselves */
2289 GNUNET_SERVER_receive_done (client,
2292 GNUNET_SERVER_client_get_address (client,
2296 LOG (GNUNET_ERROR_TYPE_INFO,
2297 "Received WELCOME message from my own identity `%4s' on address `%s'\n",
2298 GNUNET_i2s (&wm->clientIdentity),
2299 GNUNET_a2s (vaddr, alen));
2305 LOG(GNUNET_ERROR_TYPE_DEBUG,
2306 "Received WELCOME message from `%4s' %p\n",
2307 GNUNET_i2s (&wm->clientIdentity),
2309 GNUNET_STATISTICS_update (plugin->env->stats,
2310 gettext_noop ("# TCP WELCOME messages received"),
2313 session = lookup_session_by_client (plugin, client);
2314 if (NULL != session)
2317 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2319 LOG (GNUNET_ERROR_TYPE_DEBUG,
2320 "Found existing session %p for peer `%s'\n",
2322 GNUNET_a2s (vaddr, alen));
2323 GNUNET_free (vaddr);
2329 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2331 if (alen == sizeof(struct sockaddr_in))
2334 memset (&t4, '\0', sizeof (t4));
2335 t4.options = htonl (TCP_OPTIONS_NONE);
2336 t4.t4_port = s4->sin_port;
2337 t4.ipv4_addr = s4->sin_addr.s_addr;
2338 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2342 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2344 else if (alen == sizeof(struct sockaddr_in6))
2347 memset (&t6, '\0', sizeof (t6));
2348 t6.options = htonl (TCP_OPTIONS_NONE);
2349 t6.t6_port = s6->sin6_port;
2350 memcpy (&t6.ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2351 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2355 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2360 GNUNET_free_non_null (vaddr);
2361 GNUNET_SERVER_receive_done (client,
2365 session = create_session (plugin,
2367 plugin->env->get_address_type (plugin->env->cls,
2372 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != session->scope);
2373 GNUNET_HELLO_address_free (address);
2374 LOG (GNUNET_ERROR_TYPE_DEBUG,
2375 "Creating new%s session %p for peer `%s' client %p\n",
2376 GNUNET_HELLO_address_check_option (session->address,
2377 GNUNET_HELLO_ADDRESS_INFO_INBOUND)
2380 tcp_plugin_address_to_string (plugin,
2381 session->address->address,
2382 session->address->address_length),
2384 GNUNET_free (vaddr);
2385 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2388 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2389 /* Notify transport and ATS about new session */
2390 plugin->env->session_start (plugin->env->cls,
2397 LOG(GNUNET_ERROR_TYPE_DEBUG,
2398 "Did not obtain TCP socket address for incoming connection\n");
2400 GNUNET_SERVER_receive_done (client,
2406 if (session->expecting_welcome != GNUNET_YES)
2409 GNUNET_SERVER_receive_done (client,
2414 session->last_activity = GNUNET_TIME_absolute_get ();
2415 session->expecting_welcome = GNUNET_NO;
2417 process_pending_messages (session);
2418 GNUNET_SERVER_client_set_timeout (client,
2419 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2420 GNUNET_SERVER_receive_done (client,
2426 * We've received data for this peer via TCP. Unbox,
2427 * compute latency and forward.
2429 * @param cls closure
2430 * @param client identification of the client
2431 * @param message the actual message
2434 handle_tcp_data (void *cls,
2435 struct GNUNET_SERVER_Client *client,
2436 const struct GNUNET_MessageHeader *message)
2438 struct Plugin *plugin = cls;
2439 struct Session *session;
2440 struct GNUNET_TIME_Relative delay;
2443 type = ntohs (message->type);
2444 if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2445 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
2447 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2448 GNUNET_SERVER_receive_done (client,
2452 session = lookup_session_by_client (plugin, client);
2453 if (NULL == session)
2455 /* No inbound session found */
2459 GNUNET_SERVER_client_get_address (client,
2462 LOG (GNUNET_ERROR_TYPE_ERROR,
2463 "Received unexpected %u bytes of type %u from `%s'\n",
2464 (unsigned int) ntohs (message->size),
2465 (unsigned int) ntohs (message->type),
2469 GNUNET_SERVER_receive_done (client,
2471 GNUNET_free_non_null (vaddr);
2474 if (GNUNET_YES == session->expecting_welcome)
2476 /* Session is expecting WELCOME message */
2480 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2481 LOG (GNUNET_ERROR_TYPE_ERROR,
2482 "Received unexpected %u bytes of type %u from `%s'\n",
2483 (unsigned int) ntohs (message->size),
2484 (unsigned int) ntohs (message->type),
2485 GNUNET_a2s (vaddr, alen));
2487 GNUNET_SERVER_receive_done (client,
2489 GNUNET_free_non_null (vaddr);
2493 session->last_activity = GNUNET_TIME_absolute_get ();
2494 LOG (GNUNET_ERROR_TYPE_DEBUG,
2495 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2496 (unsigned int) ntohs (message->size),
2497 (unsigned int) ntohs (message->type),
2498 GNUNET_i2s (&session->target));
2500 GNUNET_STATISTICS_update (plugin->env->stats,
2501 gettext_noop ("# bytes received via TCP"),
2502 ntohs (message->size),
2505 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2508 delay = plugin->env->receive (plugin->env->cls,
2512 reschedule_session_timeout (session);
2513 if (0 == delay.rel_value_us)
2515 GNUNET_SERVER_receive_done (client,
2520 LOG (GNUNET_ERROR_TYPE_DEBUG,
2521 "Throttling receiving from `%s' for %s\n",
2522 GNUNET_i2s (&session->target),
2523 GNUNET_STRINGS_relative_time_to_string (delay,
2525 GNUNET_SERVER_disable_receive_done_warning (client);
2526 GNUNET_assert (NULL == session->receive_delay_task);
2527 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
2535 * Function called whenever a peer is connected on the "SERVER" level.
2536 * Increments number of active connections and suspends server if we
2537 * have reached the limit.
2539 * @param cls closure
2540 * @param client identification of the client
2543 connect_notify (void *cls,
2544 struct GNUNET_SERVER_Client *client)
2546 struct Plugin *plugin = cls;
2550 plugin->cur_connections++;
2551 GNUNET_STATISTICS_set (plugin->env->stats,
2552 gettext_noop ("# TCP server connections active"),
2553 plugin->cur_connections,
2555 GNUNET_STATISTICS_update (plugin->env->stats,
2556 gettext_noop ("# TCP server connect events"),
2559 if (plugin->cur_connections != plugin->max_connections)
2561 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2562 _("TCP connection limit reached, suspending server\n"));
2563 GNUNET_STATISTICS_update (plugin->env->stats,
2564 gettext_noop ("# TCP service suspended"),
2567 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2572 * Function called whenever a peer is disconnected on the "SERVER"
2573 * level. Cleans up the connection, decrements number of active
2574 * connections and if applicable resumes listening.
2576 * @param cls closure
2577 * @param client identification of the client
2580 disconnect_notify (void *cls,
2581 struct GNUNET_SERVER_Client *client)
2583 struct Plugin *plugin = cls;
2584 struct Session *session;
2588 GNUNET_assert (plugin->cur_connections >= 1);
2589 plugin->cur_connections--;
2590 session = lookup_session_by_client (plugin,
2592 if (NULL == session)
2593 return; /* unknown, nothing to do */
2594 LOG (GNUNET_ERROR_TYPE_DEBUG,
2595 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2596 GNUNET_i2s (&session->target),
2597 tcp_plugin_address_to_string (session->plugin,
2598 session->address->address,
2599 session->address->address_length));
2601 if (plugin->cur_connections == plugin->max_connections)
2603 GNUNET_STATISTICS_update (session->plugin->env->stats,
2604 gettext_noop ("# TCP service resumed"),
2607 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2609 GNUNET_STATISTICS_set (plugin->env->stats,
2610 gettext_noop ("# TCP server connections active"),
2611 plugin->cur_connections,
2613 GNUNET_STATISTICS_update (session->plugin->env->stats,
2614 gettext_noop ("# network-level TCP disconnect events"),
2617 tcp_plugin_disconnect_session (plugin,
2623 * We can now send a probe message, copy into buffer to really send.
2625 * @param cls closure, a `struct TCPProbeContext`
2626 * @param size max size to copy
2627 * @param buf buffer to copy message to
2628 * @return number of bytes copied into @a buf
2631 notify_send_probe (void *cls,
2635 struct TCPProbeContext *tcp_probe_ctx = cls;
2636 struct Plugin *plugin = tcp_probe_ctx->plugin;
2639 tcp_probe_ctx->transmit_handle = NULL;
2640 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
2645 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2646 GNUNET_free(tcp_probe_ctx);
2649 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2651 &tcp_probe_ctx->message,
2652 sizeof(tcp_probe_ctx->message));
2653 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2654 tcp_probe_ctx->sock);
2655 ret = sizeof(tcp_probe_ctx->message);
2656 GNUNET_free (tcp_probe_ctx);
2662 * Function called by the NAT subsystem suggesting another peer wants
2663 * to connect to us via connection reversal. Try to connect back to the
2666 * @param cls closure
2667 * @param addr address to try
2668 * @param addrlen number of bytes in @a addr
2671 try_connection_reversal (void *cls,
2672 const struct sockaddr *addr,
2675 struct Plugin *plugin = cls;
2676 struct GNUNET_CONNECTION_Handle *sock;
2677 struct TCPProbeContext *tcp_probe_ctx;
2680 * We have received an ICMP response, ostensibly from a peer
2681 * that wants to connect to us! Send a message to establish a connection.
2683 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET,
2688 /* failed for some odd reason (out of sockets?); ignore attempt */
2692 tcp_probe_ctx = GNUNET_new (struct TCPProbeContext);
2693 tcp_probe_ctx->message.header.size
2694 = htons (sizeof (struct TCP_NAT_ProbeMessage));
2695 tcp_probe_ctx->message.header.type
2696 = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2697 tcp_probe_ctx->message.clientIdentity
2698 = *plugin->env->my_identity;
2699 tcp_probe_ctx->plugin = plugin;
2700 tcp_probe_ctx->sock = sock;
2701 GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
2704 tcp_probe_ctx->transmit_handle
2705 = GNUNET_CONNECTION_notify_transmit_ready (sock,
2706 ntohs (tcp_probe_ctx->message.header.size),
2707 GNUNET_TIME_UNIT_FOREVER_REL,
2714 * Function obtain the network type for a session
2716 * @param cls closure (`struct Plugin *`)
2717 * @param session the session
2718 * @return the network type in HBO or #GNUNET_SYSERR
2720 static enum GNUNET_ATS_Network_Type
2721 tcp_plugin_get_network (void *cls,
2722 struct Session *session)
2724 return session->scope;
2729 * Return information about the given session to the
2732 * @param cls the `struct Plugin` with the monitor callback (`sic`)
2733 * @param peer peer we send information about
2734 * @param value our `struct Session` to send information about
2735 * @return #GNUNET_OK (continue to iterate)
2738 send_session_info_iter (void *cls,
2739 const struct GNUNET_PeerIdentity *peer,
2742 struct Plugin *plugin = cls;
2743 struct Session *session = value;
2745 notify_session_monitor (plugin,
2747 GNUNET_TRANSPORT_SS_INIT);
2748 /* FIXME: cannot tell if this is up or not from current
2750 notify_session_monitor (plugin,
2752 GNUNET_TRANSPORT_SS_UP);
2758 * Begin monitoring sessions of a plugin. There can only
2759 * be one active monitor per plugin (i.e. if there are
2760 * multiple monitors, the transport service needs to
2761 * multiplex the generated events over all of them).
2763 * @param cls closure of the plugin
2764 * @param sic callback to invoke, NULL to disable monitor;
2765 * plugin will being by iterating over all active
2766 * sessions immediately and then enter monitor mode
2767 * @param sic_cls closure for @a sic
2770 tcp_plugin_setup_monitor (void *cls,
2771 GNUNET_TRANSPORT_SessionInfoCallback sic,
2774 struct Plugin *plugin = cls;
2777 plugin->sic_cls = sic_cls;
2780 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2781 &send_session_info_iter,
2783 /* signal end of first iteration */
2784 sic (sic_cls, NULL, NULL);
2790 * Entry point for the plugin.
2792 * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *`
2793 * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error
2796 libgnunet_plugin_transport_tcp_init (void *cls)
2798 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2799 { &handle_tcp_welcome, NULL,
2800 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2801 sizeof(struct WelcomeMessage) },
2802 { &handle_tcp_nat_probe, NULL,
2803 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2804 sizeof(struct TCP_NAT_ProbeMessage) },
2805 { &handle_tcp_data, NULL,
2806 GNUNET_MESSAGE_TYPE_ALL, 0 },
2807 { NULL, NULL, 0, 0 }
2809 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2810 struct GNUNET_TRANSPORT_PluginFunctions *api;
2811 struct Plugin *plugin;
2812 struct GNUNET_SERVICE_Context *service;
2813 unsigned long long aport;
2814 unsigned long long bport;
2815 unsigned long long max_connections;
2817 struct GNUNET_TIME_Relative idle_timeout;
2819 struct GNUNET_NETWORK_Handle *const*lsocks;
2823 struct sockaddr **addrs;
2824 socklen_t *addrlens;
2826 if (NULL == env->receive)
2828 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2829 initialze the plugin or the API */
2830 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2832 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2833 api->address_to_string = &tcp_plugin_address_to_string;
2834 api->string_to_address = &tcp_plugin_string_to_address;
2838 GNUNET_assert (NULL != env->cfg);
2840 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2844 max_connections = 128;
2848 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2852 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2853 "ADVERTISED-PORT", &aport)) &&
2856 LOG(GNUNET_ERROR_TYPE_ERROR,
2857 _("Require valid port number for service `%s' in configuration!\n"),
2867 service = GNUNET_SERVICE_start ("transport-tcp",
2869 GNUNET_SERVICE_OPTION_NONE);
2870 if (NULL == service)
2872 LOG (GNUNET_ERROR_TYPE_WARNING,
2873 _("Failed to start service.\n"));
2881 plugin = GNUNET_new (struct Plugin);
2882 plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections,
2884 plugin->max_connections = max_connections;
2885 plugin->open_port = bport;
2886 plugin->adv_port = aport;
2888 plugin->my_welcome.header.size = htons (sizeof(struct WelcomeMessage));
2889 plugin->my_welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
2890 plugin->my_welcome.clientIdentity = *plugin->env->my_identity;
2892 if ( (NULL != service) &&
2894 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2899 plugin->myoptions |= TCP_OPTIONS_TCP_STEALTH;
2900 lsocks = GNUNET_SERVICE_get_listen_sockets (service);
2903 uint32_t len = sizeof (struct WelcomeMessage);
2905 for (i=0;NULL!=lsocks[i];i++)
2908 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2912 sizeof (struct GNUNET_PeerIdentity))) ||
2914 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2916 TCP_STEALTH_INTEGRITY_LEN,
2920 /* TCP STEALTH not supported by kernel */
2921 GNUNET_assert (0 == i);
2922 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2923 _("TCP_STEALTH not supported on this platform.\n"));
2929 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2930 _("TCP_STEALTH not supported on this platform.\n"));
2935 if ( (NULL != service) &&
2938 GNUNET_SERVICE_get_server_addresses ("transport-tcp",
2943 for (ret = ret_s-1; ret >= 0; ret--)
2944 LOG (GNUNET_ERROR_TYPE_INFO,
2945 "Binding to address `%s'\n",
2946 GNUNET_a2s (addrs[ret], addrlens[ret]));
2948 = GNUNET_NAT_register (env->cfg,
2951 (unsigned int) ret_s,
2952 (const struct sockaddr **) addrs, addrlens,
2953 &tcp_nat_port_map_callback,
2954 &try_connection_reversal,
2956 for (ret = ret_s -1; ret >= 0; ret--)
2957 GNUNET_free (addrs[ret]);
2958 GNUNET_free_non_null (addrs);
2959 GNUNET_free_non_null (addrlens);
2963 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2970 &try_connection_reversal,
2973 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2975 api->send = &tcp_plugin_send;
2976 api->get_session = &tcp_plugin_get_session;
2977 api->disconnect_session = &tcp_plugin_disconnect_session;
2978 api->query_keepalive_factor = &tcp_plugin_query_keepalive_factor;
2979 api->disconnect_peer = &tcp_plugin_disconnect;
2980 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2981 api->check_address = &tcp_plugin_check_address;
2982 api->address_to_string = &tcp_plugin_address_to_string;
2983 api->string_to_address = &tcp_plugin_string_to_address;
2984 api->get_network = &tcp_plugin_get_network;
2985 api->update_session_timeout = &tcp_plugin_update_session_timeout;
2986 api->update_inbound_delay = &tcp_plugin_update_inbound_delay;
2987 api->setup_monitor = &tcp_plugin_setup_monitor;
2988 plugin->service = service;
2989 if (NULL != service)
2991 plugin->server = GNUNET_SERVICE_get_server (service);
2996 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3001 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3007 = GNUNET_SERVER_create_with_sockets (NULL,
3013 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
3014 memcpy (plugin->handlers, my_handlers, sizeof(my_handlers));
3015 for (i = 0;i < sizeof(my_handlers) / sizeof(struct GNUNET_SERVER_MessageHandler);i++)
3016 plugin->handlers[i].callback_cls = plugin;
3018 GNUNET_SERVER_add_handlers (plugin->server,
3020 GNUNET_SERVER_connect_notify (plugin->server,
3023 GNUNET_SERVER_disconnect_notify (plugin->server,
3026 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16,
3029 LOG (GNUNET_ERROR_TYPE_INFO,
3030 _("TCP transport listening on port %llu\n"),
3033 LOG (GNUNET_ERROR_TYPE_INFO,
3034 _("TCP transport not listening on any port (client only)\n"));
3035 if ( (aport != bport) &&
3037 LOG (GNUNET_ERROR_TYPE_INFO,
3038 _("TCP transport advertises itself as being on port %llu\n"),
3040 /* Initially set connections to 0 */
3041 GNUNET_STATISTICS_set (plugin->env->stats,
3042 gettext_noop ("# TCP sessions active"),
3048 if (NULL != plugin->nat)
3049 GNUNET_NAT_unregister (plugin->nat);
3050 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3051 if (NULL != service)
3052 GNUNET_SERVICE_stop (service);
3053 GNUNET_free (plugin);
3054 GNUNET_free_non_null (api);
3060 * Exit point from the plugin.
3062 * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions`
3066 libgnunet_plugin_transport_tcp_done (void *cls)
3068 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3069 struct Plugin *plugin = api->cls;
3070 struct TCPProbeContext *tcp_probe;
3071 struct PrettyPrinterContext *cur;
3072 struct PrettyPrinterContext *next;
3079 LOG (GNUNET_ERROR_TYPE_DEBUG,
3080 "Shutting down TCP plugin\n");
3082 /* Removing leftover sessions */
3083 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
3084 &session_disconnect_it,
3086 /* Removing leftover NAT sessions */
3087 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
3088 &session_disconnect_it,
3091 for (cur = plugin->ppc_dll_head; NULL != cur; cur = next)
3094 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
3095 plugin->ppc_dll_tail,
3097 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3098 cur->asc (cur->asc_cls,
3104 if (NULL != plugin->service)
3105 GNUNET_SERVICE_stop (plugin->service);
3107 GNUNET_SERVER_destroy (plugin->server);
3108 GNUNET_free (plugin->handlers);
3109 if (NULL != plugin->nat)
3110 GNUNET_NAT_unregister (plugin->nat);
3111 while (NULL != (tcp_probe = plugin->probe_head))
3113 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
3116 GNUNET_CONNECTION_destroy (tcp_probe->sock);
3117 GNUNET_free (tcp_probe);
3119 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
3120 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3121 GNUNET_break (0 == plugin->cur_connections);
3122 GNUNET_free (plugin);
3127 /* end of plugin_transport_tcp.c */