2 This file is part of GNUnet
3 Copyright (C) 2002--2014 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 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 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 * Are we still expecting the welcome message? (#GNUNET_YES/#GNUNET_NO)
336 int expecting_welcome;
339 * Was this session created using NAT traversal?
344 * ATS network type in NBO
346 enum GNUNET_ATS_Network_Type ats_address_network_type;
350 * Encapsulation of all of the state of the plugin.
357 struct GNUNET_TRANSPORT_PluginEnvironment *env;
362 struct GNUNET_CONNECTION_Handle *lsock;
365 * Our handle to the NAT module.
367 struct GNUNET_NAT_Handle *nat;
370 * Map from peer identities to sessions for the given peer.
372 struct GNUNET_CONTAINER_MultiPeerMap *sessionmap;
375 * Handle to the network service.
377 struct GNUNET_SERVICE_Context *service;
380 * Handle to the server for this service.
382 struct GNUNET_SERVER_Handle *server;
385 * Copy of the handler array where the closures are
386 * set to this struct's instance.
388 struct GNUNET_SERVER_MessageHandler *handlers;
391 * Map of peers we have tried to contact behind a NAT
393 struct GNUNET_CONTAINER_MultiPeerMap *nat_wait_conns;
396 * List of active TCP probes.
398 struct TCPProbeContext *probe_head;
401 * List of active TCP probes.
403 struct TCPProbeContext *probe_tail;
406 * Handle for (DYN)DNS lookup of our external IP.
408 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
411 * Function to call about session status changes.
413 GNUNET_TRANSPORT_SessionInfoCallback sic;
416 * Closure for @e sic.
421 * Welcome message used by this peer.
423 struct WelcomeMessage my_welcome;
426 * How many more TCP sessions are we allowed to open right now?
428 unsigned long long max_connections;
431 * How many more TCP sessions do we have right now?
433 unsigned long long cur_connections;
436 * ID of task used to update our addresses when one expires.
438 struct GNUNET_SCHEDULER_Task * address_update_task;
446 * Port that we are actually listening on.
451 * Port that the user said we would have visible to the
460 * If a session monitor is attached, notify it about the new
463 * @param plugin our plugin
464 * @param session session that changed state
465 * @param state new state of the session
468 notify_session_monitor (struct Plugin *plugin,
469 struct Session *session,
470 enum GNUNET_TRANSPORT_SessionState state)
472 struct GNUNET_TRANSPORT_SessionInfo info;
474 if (NULL == plugin->sic)
476 memset (&info, 0, sizeof (info));
478 info.is_inbound = (0 != (GNUNET_HELLO_ADDRESS_INFO_INBOUND & session->address->local_info))
481 info.num_msg_pending = session->msgs_in_queue;
482 info.num_bytes_pending = session->bytes_in_queue;
483 if (NULL != session->receive_delay_task)
484 info.receive_delay = session->receive_delay;
485 info.session_timeout = session->timeout;
486 info.address = session->address;
487 plugin->sic (plugin->sic_cls,
494 * Function called for a quick conversion of the binary address to
495 * a numeric address. Note that the caller must not free the
496 * address and that the next call to this function is allowed
497 * to override the address again.
499 * @param cls closure (`struct Plugin *`)
500 * @param addr binary address
501 * @param addrlen length of @a addr
502 * @return string representing the same address
505 tcp_plugin_address_to_string (void *cls,
511 * Function to check if an inbound connection is acceptable.
512 * Mostly used to limit the total number of open connections
515 * @param cls the `struct Plugin`
516 * @param ucred credentials, if available, otherwise NULL
517 * @param addr address
518 * @param addrlen length of @a addr
519 * @return #GNUNET_YES to allow, #GNUNET_NO to deny, #GNUNET_SYSERR
520 * for unknown address family (will be denied).
523 plugin_tcp_access_check (void *cls,
524 const struct GNUNET_CONNECTION_Credentials *ucred,
525 const struct sockaddr *addr,
528 struct Plugin *plugin = cls;
530 LOG (GNUNET_ERROR_TYPE_DEBUG,
531 "Accepting new incoming TCP connection from `%s'\n",
532 GNUNET_a2s (addr, addrlen));
533 if (plugin->cur_connections >= plugin->max_connections)
535 plugin->cur_connections++;
541 * Our external IP address/port mapping has changed.
543 * @param cls closure, the `struct Plugin`
544 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
545 * the previous (now invalid) one
546 * @param addr either the previous or the new public IP address
547 * @param addrlen actual length of @a addr
550 tcp_nat_port_map_callback (void *cls,
552 const struct sockaddr *addr,
555 struct Plugin *plugin = cls;
556 struct GNUNET_HELLO_Address *address;
557 struct IPv4TcpAddress t4;
558 struct IPv6TcpAddress t6;
562 LOG(GNUNET_ERROR_TYPE_INFO,
563 "NAT notification to %s address `%s'\n",
564 (GNUNET_YES == add_remove) ? "add" : "remove",
565 GNUNET_a2s (addr, addrlen));
566 /* convert 'addr' to our internal format */
567 switch (addr->sa_family)
570 GNUNET_assert(addrlen == sizeof(struct sockaddr_in));
571 memset (&t4, 0, sizeof(t4));
572 t4.options = htonl (plugin->myoptions);
573 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
574 t4.t4_port = ((struct sockaddr_in *) addr)->sin_port;
579 GNUNET_assert(addrlen == sizeof(struct sockaddr_in6));
580 memset (&t6, 0, sizeof(t6));
581 memcpy (&t6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
582 sizeof(struct in6_addr));
583 t6.options = htonl (plugin->myoptions);
584 t6.t6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
592 /* modify our published address list */
593 GNUNET_assert ((args == sizeof (struct IPv4TcpAddress)) ||
594 (args == sizeof (struct IPv6TcpAddress)));
595 address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
596 PLUGIN_NAME, arg, args, GNUNET_HELLO_ADDRESS_INFO_NONE);
597 plugin->env->notify_address (plugin->env->cls, add_remove, address);
598 GNUNET_HELLO_address_free(address);
603 * Function called for a quick conversion of the binary address to
604 * a numeric address. Note that the caller must not free the
605 * address and that the next call to this function is allowed
606 * to override the address again.
608 * @param cls closure (`struct Plugin*`)
609 * @param addr binary address
610 * @param addrlen length of @a addr
611 * @return string representing the same address
614 tcp_plugin_address_to_string (void *cls,
618 static char rbuf[INET6_ADDRSTRLEN + 12];
619 char buf[INET6_ADDRSTRLEN];
623 const struct IPv4TcpAddress *t4;
624 const struct IPv6TcpAddress *t6;
631 case sizeof(struct IPv6TcpAddress):
634 port = ntohs (t6->t6_port);
635 options = ntohl (t6->options);
636 memcpy (&a6, &t6->ipv6_addr, sizeof(a6));
639 case sizeof(struct IPv4TcpAddress):
642 port = ntohs (t4->t4_port);
643 options = ntohl (t4->options);
644 memcpy (&a4, &t4->ipv4_addr, sizeof(a4));
648 LOG (GNUNET_ERROR_TYPE_WARNING,
649 _("Unexpected address length: %u bytes\n"),
650 (unsigned int) addrlen);
653 if (NULL == inet_ntop (af, sb, buf, INET6_ADDRSTRLEN))
655 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
659 GNUNET_snprintf (rbuf, sizeof(rbuf),
660 (af == AF_INET6) ? "%s.%u.[%s]:%u" : "%s.%u.%s:%u",
670 * Function called to convert a string address to
673 * @param cls closure (`struct Plugin*`)
674 * @param addr string address
675 * @param addrlen length of the address
676 * @param buf location to store the buffer
677 * @param added location to store the number of bytes in the buffer.
678 * If the function returns #GNUNET_SYSERR, its contents are undefined.
679 * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
682 tcp_plugin_string_to_address (void *cls,
688 struct sockaddr_storage socket_address;
694 /* Format tcp.options.address:port */
698 if ((NULL == addr) || (addrlen == 0))
701 return GNUNET_SYSERR;
703 if ('\0' != addr[addrlen - 1])
706 return GNUNET_SYSERR;
708 if (strlen (addr) != addrlen - 1)
711 return GNUNET_SYSERR;
713 plugin = GNUNET_strdup (addr);
714 optionstr = strchr (plugin, '.');
715 if (NULL == optionstr)
719 return GNUNET_SYSERR;
723 options = atol (optionstr);
724 address = strchr (optionstr, '.');
729 return GNUNET_SYSERR;
735 != GNUNET_STRINGS_to_address_ip (address, strlen (address),
740 return GNUNET_SYSERR;
744 switch (socket_address.ss_family)
748 struct IPv4TcpAddress *t4;
749 struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
750 t4 = GNUNET_new (struct IPv4TcpAddress);
751 t4->options = htonl (options);
752 t4->ipv4_addr = in4->sin_addr.s_addr;
753 t4->t4_port = in4->sin_port;
755 *added = sizeof(struct IPv4TcpAddress);
760 struct IPv6TcpAddress *t6;
761 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
762 t6 = GNUNET_new (struct IPv6TcpAddress);
763 t6->options = htonl (options);
764 t6->ipv6_addr = in6->sin6_addr;
765 t6->t6_port = in6->sin6_port;
767 *added = sizeof(struct IPv6TcpAddress);
771 return GNUNET_SYSERR;
777 * Find the session handle for the given client.
778 * Currently uses both the hashmap and the client
779 * context, as the client context is new and the
780 * logic still needs to be tested.
782 * @param plugin the plugin
783 * @param client which client to find the session handle for
784 * @return NULL if no matching session exists
786 static struct Session *
787 lookup_session_by_client (struct Plugin *plugin,
788 struct GNUNET_SERVER_Client *client)
790 return GNUNET_SERVER_client_get_user_context (client, struct Session);
795 * Functions with this signature are called whenever we need
796 * to close a session due to a disconnect or failure to
797 * establish a connection.
799 * @param cls the `struct Plugin`
800 * @param session session to close down
801 * @return #GNUNET_OK on success
804 tcp_plugin_disconnect_session (void *cls,
805 struct Session *session)
807 struct Plugin *plugin = cls;
808 struct PendingMessage *pm;
810 LOG (GNUNET_ERROR_TYPE_DEBUG,
811 "Disconnecting session of peer `%s' address `%s'\n",
812 GNUNET_i2s (&session->target),
813 tcp_plugin_address_to_string (session->plugin,
814 session->address->address,
815 session->address->address_length));
817 if (NULL != session->timeout_task)
819 GNUNET_SCHEDULER_cancel (session->timeout_task);
820 session->timeout_task = NULL;
821 session->timeout = GNUNET_TIME_UNIT_ZERO_ABS;
825 GNUNET_CONTAINER_multipeermap_remove (plugin->sessionmap,
829 GNUNET_STATISTICS_update (session->plugin->env->stats,
830 gettext_noop ("# TCP sessions active"), -1, GNUNET_NO);
834 GNUNET_assert(GNUNET_YES ==
835 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
839 if (NULL != session->client)
840 GNUNET_SERVER_client_set_user_context (session->client,
844 if (NULL != session->transmit_handle)
846 GNUNET_SERVER_notify_transmit_ready_cancel (session->transmit_handle);
847 session->transmit_handle = NULL;
849 session->plugin->env->session_end (session->plugin->env->cls,
853 if (NULL != session->nat_connection_timeout)
855 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
856 session->nat_connection_timeout = NULL;
859 while (NULL != (pm = session->pending_messages_head))
861 LOG (GNUNET_ERROR_TYPE_DEBUG,
862 (NULL != pm->transmit_cont)
863 ? "Could not deliver message to `%4s'.\n"
864 : "Could not deliver message to `%4s', notifying.\n",
865 GNUNET_i2s (&session->target));
866 GNUNET_STATISTICS_update (session->plugin->env->stats,
867 gettext_noop ("# bytes currently in TCP buffers"),
868 -(int64_t) pm->message_size, GNUNET_NO);
869 GNUNET_STATISTICS_update (session->plugin->env->stats,
870 gettext_noop ("# bytes discarded by TCP (disconnect)"),
873 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
874 session->pending_messages_tail,
876 GNUNET_assert (0 < session->msgs_in_queue);
877 session->msgs_in_queue--;
878 GNUNET_assert (pm->message_size <= session->bytes_in_queue);
879 session->bytes_in_queue -= pm->message_size;
880 if (NULL != pm->transmit_cont)
881 pm->transmit_cont (pm->transmit_cont_cls,
888 GNUNET_assert (0 == session->msgs_in_queue);
889 GNUNET_assert (0 == session->bytes_in_queue);
890 notify_session_monitor (session->plugin,
892 GNUNET_TRANSPORT_SS_DONE);
894 if (NULL != session->receive_delay_task)
896 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
897 if (NULL != session->client)
898 GNUNET_SERVER_receive_done (session->client, GNUNET_SYSERR);
900 if (NULL != session->client)
902 GNUNET_SERVER_client_disconnect (session->client);
903 GNUNET_SERVER_client_drop (session->client);
904 session->client = NULL;
906 GNUNET_HELLO_address_free (session->address);
907 GNUNET_assert(NULL == session->transmit_handle);
908 GNUNET_free(session);
914 * Function that is called to get the keepalive factor.
915 * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
916 * calculate the interval between keepalive packets.
918 * @param cls closure with the `struct Plugin`
919 * @return keepalive factor
922 tcp_plugin_query_keepalive_factor (void *cls)
929 * Session was idle, so disconnect it
931 * @param cls the `struct Session` of the idle session
932 * @param tc scheduler context
935 session_timeout (void *cls,
936 const struct GNUNET_SCHEDULER_TaskContext *tc)
938 struct Session *s = cls;
939 struct GNUNET_TIME_Relative left;
941 s->timeout_task = NULL;
942 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
943 if (0 != left.rel_value_us)
945 /* not actually our turn yet, but let's at least update
946 the monitor, it may think we're about to die ... */
947 notify_session_monitor (s->plugin,
949 GNUNET_TRANSPORT_SS_UPDATE);
950 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
955 LOG (GNUNET_ERROR_TYPE_DEBUG,
956 "Session %p was idle for %s, disconnecting\n",
958 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
960 /* call session destroy function */
961 tcp_plugin_disconnect_session (s->plugin, s);
966 * Increment session timeout due to activity
968 * @param s session to increment timeout for
971 reschedule_session_timeout (struct Session *s)
973 GNUNET_assert(NULL != s->timeout_task);
974 s->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
979 * Create a new session. Also queues a welcome message.
981 * @param plugin the plugin
982 * @param address the address to create the session for
983 * @param client client to use, reference counter must have already been increased
984 * @param is_nat this a NAT session, we should wait for a client to
985 * connect to us from an address, then assign that to
987 * @return new session object
989 static struct Session *
990 create_session (struct Plugin *plugin,
991 const struct GNUNET_HELLO_Address *address,
992 struct GNUNET_SERVER_Client *client,
995 struct Session *session;
996 struct PendingMessage *pm;
998 if (GNUNET_YES != is_nat)
999 GNUNET_assert (NULL != client);
1001 GNUNET_assert (NULL == client);
1003 LOG (GNUNET_ERROR_TYPE_DEBUG,
1004 "Creating new session for peer `%4s'\n",
1005 GNUNET_i2s (&address->peer));
1006 session = GNUNET_new (struct Session);
1007 session->last_activity = GNUNET_TIME_absolute_get ();
1008 session->plugin = plugin;
1009 session->is_nat = is_nat;
1010 session->client = client;
1011 session->address = GNUNET_HELLO_address_copy (address);
1012 session->target = address->peer;
1013 session->expecting_welcome = GNUNET_YES;
1014 session->ats_address_network_type = GNUNET_ATS_NET_UNSPECIFIED;
1015 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
1016 sizeof (struct WelcomeMessage));
1017 pm->msg = (const char *) &pm[1];
1018 pm->message_size = sizeof(struct WelcomeMessage);
1020 &plugin->my_welcome,
1021 sizeof(struct WelcomeMessage));
1022 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1023 GNUNET_STATISTICS_update (plugin->env->stats,
1024 gettext_noop ("# bytes currently in TCP buffers"), pm->message_size,
1026 GNUNET_CONTAINER_DLL_insert (session->pending_messages_head,
1027 session->pending_messages_tail,
1029 session->msgs_in_queue++;
1030 session->bytes_in_queue += pm->message_size;
1031 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1032 session->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1035 notify_session_monitor (session->plugin,
1037 GNUNET_TRANSPORT_SS_INIT);
1038 if (GNUNET_YES != is_nat)
1040 GNUNET_STATISTICS_update (plugin->env->stats,
1041 gettext_noop ("# TCP sessions active"),
1044 notify_session_monitor (session->plugin,
1046 GNUNET_TRANSPORT_SS_UP);
1050 notify_session_monitor (session->plugin,
1052 GNUNET_TRANSPORT_SS_HANDSHAKE);
1059 * If we have pending messages, ask the server to
1060 * transmit them (schedule the respective tasks, etc.)
1062 * @param session for which session should we do this
1065 process_pending_messages (struct Session *session);
1069 * Function called to notify a client about the socket
1070 * being ready to queue more data. "buf" will be
1071 * NULL and "size" zero if the socket was closed for
1072 * writing in the meantime.
1074 * @param cls closure
1075 * @param size number of bytes available in @a buf
1076 * @param buf where the callee should write the message
1077 * @return number of bytes written to @a buf
1080 do_transmit (void *cls, size_t size, void *buf)
1082 struct Session *session = cls;
1083 struct GNUNET_PeerIdentity pid;
1084 struct Plugin *plugin;
1085 struct PendingMessage *pos;
1086 struct PendingMessage *hd;
1087 struct PendingMessage *tl;
1088 struct GNUNET_TIME_Absolute now;
1092 session->transmit_handle = NULL;
1093 plugin = session->plugin;
1096 LOG (GNUNET_ERROR_TYPE_DEBUG,
1097 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
1098 GNUNET_i2s (&session->target));
1099 /* timeout; cancel all messages that have already expired */
1103 now = GNUNET_TIME_absolute_get ();
1104 while ( (NULL != (pos = session->pending_messages_head)) &&
1105 (pos->timeout.abs_value_us <= now.abs_value_us) )
1107 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1108 session->pending_messages_tail,
1110 GNUNET_assert (0 < session->msgs_in_queue);
1111 session->msgs_in_queue--;
1112 GNUNET_assert (pos->message_size <= session->bytes_in_queue);
1113 session->bytes_in_queue -= pos->message_size;
1114 LOG (GNUNET_ERROR_TYPE_DEBUG,
1115 "Failed to transmit %u byte message to `%4s'.\n",
1117 GNUNET_i2s (&session->target));
1118 ret += pos->message_size;
1119 GNUNET_CONTAINER_DLL_insert_after (hd,
1124 /* do this call before callbacks (so that if callbacks destroy
1125 * session, they have a chance to cancel actions done by this
1127 process_pending_messages (session);
1128 pid = session->target;
1129 /* no do callbacks and do not use session again since
1130 * the callbacks may abort the session */
1131 while (NULL != (pos = hd))
1133 GNUNET_CONTAINER_DLL_remove (hd,
1136 if (NULL != pos->transmit_cont)
1137 pos->transmit_cont (pos->transmit_cont_cls,
1144 GNUNET_STATISTICS_update (plugin->env->stats,
1145 gettext_noop ("# bytes currently in TCP buffers"), -(int64_t) ret,
1147 GNUNET_STATISTICS_update (plugin->env->stats,
1148 gettext_noop ("# bytes discarded by TCP (timeout)"),
1152 notify_session_monitor (session->plugin,
1154 GNUNET_TRANSPORT_SS_UPDATE);
1157 /* copy all pending messages that would fit */
1162 while (NULL != (pos = session->pending_messages_head))
1164 if (ret + pos->message_size > size)
1166 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1167 session->pending_messages_tail,
1169 GNUNET_assert (0 < session->msgs_in_queue);
1170 session->msgs_in_queue--;
1171 GNUNET_assert (pos->message_size <= session->bytes_in_queue);
1172 session->bytes_in_queue -= pos->message_size;
1173 GNUNET_assert(size >= pos->message_size);
1174 LOG (GNUNET_ERROR_TYPE_DEBUG,
1175 "Transmitting message of type %u size %u to %s\n",
1176 ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type),
1178 tcp_plugin_address_to_string (session->plugin,
1179 session->address->address,
1180 session->address->address_length));
1181 /* FIXME: this memcpy can be up to 7% of our total runtime */
1185 cbuf += pos->message_size;
1186 ret += pos->message_size;
1187 size -= pos->message_size;
1188 GNUNET_CONTAINER_DLL_insert_tail (hd,
1192 notify_session_monitor (session->plugin,
1194 GNUNET_TRANSPORT_SS_UPDATE);
1195 /* schedule 'continuation' before callbacks so that callbacks that
1196 * cancel everything don't cause us to use a session that no longer
1198 process_pending_messages (session);
1199 session->last_activity = GNUNET_TIME_absolute_get ();
1200 pid = session->target;
1201 /* we'll now call callbacks that may cancel the session; hence
1202 * we should not use 'session' after this point */
1203 while (NULL != (pos = hd))
1205 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
1206 if (NULL != pos->transmit_cont)
1207 pos->transmit_cont (pos->transmit_cont_cls,
1211 pos->message_size); /* FIXME: include TCP overhead */
1214 GNUNET_assert (NULL == hd);
1215 GNUNET_assert (NULL == tl);
1216 LOG (GNUNET_ERROR_TYPE_DEBUG,
1217 "Transmitting %u bytes\n",
1219 GNUNET_STATISTICS_update (plugin->env->stats,
1220 gettext_noop ("# bytes currently in TCP buffers"),
1223 GNUNET_STATISTICS_update (plugin->env->stats,
1224 gettext_noop ("# bytes transmitted via TCP"),
1232 * If we have pending messages, ask the server to
1233 * transmit them (schedule the respective tasks, etc.)
1235 * @param session for which session should we do this
1238 process_pending_messages (struct Session *session)
1240 struct PendingMessage *pm;
1242 GNUNET_assert (NULL != session->client);
1243 if (NULL != session->transmit_handle)
1245 if (NULL == (pm = session->pending_messages_head))
1248 session->transmit_handle = GNUNET_SERVER_notify_transmit_ready (session->client,
1250 GNUNET_TIME_absolute_get_remaining (pm->timeout),
1257 * Function that can be used by the transport service to transmit
1258 * a message using the plugin. Note that in the case of a
1259 * peer disconnecting, the continuation MUST be called
1260 * prior to the disconnect notification itself. This function
1261 * will be called with this peer's HELLO message to initiate
1262 * a fresh connection to another peer.
1264 * @param cls closure
1265 * @param session which session must be used
1266 * @param msgbuf the message to transmit
1267 * @param msgbuf_size number of bytes in 'msgbuf'
1268 * @param priority how important is the message (most plugins will
1269 * ignore message priority and just FIFO)
1270 * @param to how long to wait at most for the transmission (does not
1271 * require plugins to discard the message after the timeout,
1272 * just advisory for the desired delay; most plugins will ignore
1274 * @param cont continuation to call once the message has
1275 * been transmitted (or if the transport is ready
1276 * for the next transmission call; or if the
1277 * peer disconnected...); can be NULL
1278 * @param cont_cls closure for @a cont
1279 * @return number of bytes used (on the physical network, with overheads);
1280 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1281 * and does NOT mean that the message was not transmitted (DV)
1284 tcp_plugin_send (void *cls,
1285 struct Session *session,
1288 unsigned int priority,
1289 struct GNUNET_TIME_Relative to,
1290 GNUNET_TRANSPORT_TransmitContinuation cont,
1293 struct Plugin * plugin = cls;
1294 struct PendingMessage *pm;
1296 /* create new message entry */
1297 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1298 pm->msg = (const char *) &pm[1];
1299 memcpy (&pm[1], msgbuf, msgbuf_size);
1300 pm->message_size = msgbuf_size;
1301 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1302 pm->transmit_cont = cont;
1303 pm->transmit_cont_cls = cont_cls;
1305 LOG(GNUNET_ERROR_TYPE_DEBUG,
1306 "Asked to transmit %u bytes to `%s', added message to list.\n",
1308 GNUNET_i2s (&session->target));
1311 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
1315 GNUNET_assert (NULL != session->client);
1316 GNUNET_SERVER_client_set_timeout (session->client,
1317 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1318 GNUNET_STATISTICS_update (plugin->env->stats,
1319 gettext_noop ("# bytes currently in TCP buffers"),
1323 /* append pm to pending_messages list */
1324 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1325 session->pending_messages_tail,
1327 notify_session_monitor (session->plugin,
1329 GNUNET_TRANSPORT_SS_UPDATE);
1330 session->msgs_in_queue++;
1331 session->bytes_in_queue += pm->message_size;
1332 process_pending_messages (session);
1336 GNUNET_CONTAINER_multipeermap_contains_value (plugin->nat_wait_conns,
1340 LOG (GNUNET_ERROR_TYPE_DEBUG,
1341 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1342 GNUNET_i2s (&session->target));
1343 GNUNET_STATISTICS_update (plugin->env->stats,
1344 gettext_noop ("# bytes currently in TCP buffers"), msgbuf_size,
1346 /* append pm to pending_messages list */
1347 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1348 session->pending_messages_tail,
1350 session->msgs_in_queue++;
1351 session->bytes_in_queue += pm->message_size;
1352 notify_session_monitor (session->plugin,
1354 GNUNET_TRANSPORT_SS_HANDSHAKE);
1357 LOG(GNUNET_ERROR_TYPE_ERROR,
1358 "Invalid session %p\n",
1368 return GNUNET_SYSERR; /* session does not exist here */
1373 * Closure for #session_lookup_it().
1378 * Address we are looking for.
1380 const struct GNUNET_HELLO_Address *address;
1383 * Where to store the session (if we found it).
1385 struct Session *result;
1391 * Look for a session by address.
1393 * @param cls the `struct SessionItCtx`
1395 * @param value a `struct Session`
1396 * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session
1399 session_lookup_it (void *cls,
1400 const struct GNUNET_PeerIdentity *key,
1403 struct SessionItCtx *si_ctx = cls;
1404 struct Session *session = value;
1407 GNUNET_HELLO_address_cmp (si_ctx->address,
1410 si_ctx->result = session;
1416 * Task cleaning up a NAT connection attempt after timeout
1418 * @param cls the `struct Session`
1419 * @param tc scheduler context (unused)
1422 nat_connect_timeout (void *cls,
1423 const struct GNUNET_SCHEDULER_TaskContext *tc)
1425 struct Session *session = cls;
1427 session->nat_connection_timeout = NULL;
1428 LOG (GNUNET_ERROR_TYPE_DEBUG,
1429 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1430 GNUNET_i2s (&session->target),
1431 tcp_plugin_address_to_string (session->plugin,
1432 session->address->address,
1433 session->address->address_length));
1434 tcp_plugin_disconnect_session (session->plugin,
1440 * Function that will be called whenever the transport service wants to
1441 * notify the plugin that a session is still active and in use and
1442 * therefore the session timeout for this session has to be updated
1444 * @param cls closure
1445 * @param peer which peer was the session for
1446 * @param session which session is being updated
1449 tcp_plugin_update_session_timeout (void *cls,
1450 const struct GNUNET_PeerIdentity *peer,
1451 struct Session *session)
1453 reschedule_session_timeout (session);
1458 * Task to signal the server that we can continue
1459 * receiving from the TCP client now.
1461 * @param cls the `struct Session*`
1462 * @param tc task context (unused)
1465 delayed_done (void *cls,
1466 const struct GNUNET_SCHEDULER_TaskContext *tc)
1468 struct Session *session = cls;
1470 session->receive_delay_task = NULL;
1471 reschedule_session_timeout (session);
1473 GNUNET_SERVER_receive_done (session->client, GNUNET_OK);
1478 * Function that will be called whenever the transport service wants to
1479 * notify the plugin that the inbound quota changed and that the plugin
1480 * should update it's delay for the next receive value
1482 * @param cls closure
1483 * @param peer which peer was the session for
1484 * @param session which session is being updated
1485 * @param delay new delay to use for receiving
1488 tcp_plugin_update_inbound_delay (void *cls,
1489 const struct GNUNET_PeerIdentity *peer,
1490 struct Session *session,
1491 struct GNUNET_TIME_Relative delay)
1493 if (NULL == session->receive_delay_task)
1495 LOG (GNUNET_ERROR_TYPE_DEBUG,
1496 "New inbound delay %s\n",
1497 GNUNET_STRINGS_relative_time_to_string (delay,
1499 session->receive_delay = GNUNET_TIME_relative_to_absolute (delay);
1500 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1501 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
1508 * Create a new session to transmit data to the target
1509 * This session will used to send data to this peer and the plugin will
1510 * notify us by calling the env->session_end function
1512 * @param cls closure
1513 * @param address the address to use
1514 * @return the session if the address is valid, NULL otherwise
1516 static struct Session *
1517 tcp_plugin_get_session (void *cls,
1518 const struct GNUNET_HELLO_Address *address)
1520 struct Plugin *plugin = cls;
1521 struct Session *session = NULL;
1525 struct GNUNET_CONNECTION_Handle *sa;
1526 struct sockaddr_in a4;
1527 struct sockaddr_in6 a6;
1528 const struct IPv4TcpAddress *t4;
1529 const struct IPv6TcpAddress *t6;
1530 unsigned int options;
1531 enum GNUNET_ATS_Network_Type net_type;
1532 unsigned int is_natd = GNUNET_NO;
1535 struct GNUNET_NETWORK_Handle *s;
1538 addrlen = address->address_length;
1539 LOG (GNUNET_ERROR_TYPE_DEBUG,
1540 "Trying to get session for `%s' address of peer `%s'\n",
1541 tcp_plugin_address_to_string (plugin,
1543 address->address_length),
1544 GNUNET_i2s (&address->peer));
1546 if (GNUNET_HELLO_address_check_option (address,
1547 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1553 /* look for existing session */
1555 GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
1558 struct SessionItCtx si_ctx;
1560 si_ctx.address = address;
1561 si_ctx.result = NULL;
1563 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1565 &session_lookup_it, &si_ctx);
1566 if (NULL != si_ctx.result)
1568 session = si_ctx.result;
1569 LOG (GNUNET_ERROR_TYPE_DEBUG,
1570 "Found existing session for `%s' address `%s' session %p\n",
1571 GNUNET_i2s (&address->peer),
1572 tcp_plugin_address_to_string (plugin,
1574 address->address_length),
1578 LOG (GNUNET_ERROR_TYPE_DEBUG,
1579 "Existing sessions did not match address `%s' or peer `%s'\n",
1580 tcp_plugin_address_to_string (plugin,
1582 address->address_length),
1583 GNUNET_i2s (&address->peer));
1586 if (addrlen == sizeof(struct IPv6TcpAddress))
1588 GNUNET_assert(NULL != address->address); /* make static analysis happy */
1589 t6 = address->address;
1590 options = t6->options;
1592 memset (&a6, 0, sizeof(a6));
1593 #if HAVE_SOCKADDR_IN_SIN_LEN
1594 a6.sin6_len = sizeof (a6);
1596 a6.sin6_family = AF_INET6;
1597 a6.sin6_port = t6->t6_port;
1598 if (t6->t6_port == 0)
1599 is_natd = GNUNET_YES;
1600 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1604 else if (addrlen == sizeof(struct IPv4TcpAddress))
1606 GNUNET_assert(NULL != address->address); /* make static analysis happy */
1607 t4 = address->address;
1608 options = t4->options;
1610 memset (&a4, 0, sizeof(a4));
1611 #if HAVE_SOCKADDR_IN_SIN_LEN
1612 a4.sin_len = sizeof (a4);
1614 a4.sin_family = AF_INET;
1615 a4.sin_port = t4->t4_port;
1616 if (t4->t4_port == 0)
1617 is_natd = GNUNET_YES;
1618 a4.sin_addr.s_addr = t4->ipv4_addr;
1624 GNUNET_STATISTICS_update (plugin->env->stats, gettext_noop
1625 ("# requests to create session with invalid address"), 1, GNUNET_NO);
1629 net_type = plugin->env->get_address_type (plugin->env->cls, sb, sbs);
1632 if ((is_natd == GNUNET_YES) && (addrlen == sizeof(struct IPv6TcpAddress)))
1634 /* NAT client only works with IPv4 addresses */
1638 if (plugin->cur_connections >= plugin->max_connections)
1644 if ((is_natd == GNUNET_YES)
1646 == GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1649 /* Only do one NAT punch attempt per peer identity */
1653 if ((is_natd == GNUNET_YES) && (NULL != plugin->nat) &&
1655 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1658 LOG (GNUNET_ERROR_TYPE_DEBUG,
1659 "Found valid IPv4 NAT address (creating session)!\n");
1660 session = create_session (plugin,
1664 session->ats_address_network_type = net_type;
1665 GNUNET_break (session->ats_address_network_type != GNUNET_ATS_NET_UNSPECIFIED);
1666 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
1667 &nat_connect_timeout,
1669 GNUNET_assert(GNUNET_OK ==
1670 GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
1673 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1675 LOG (GNUNET_ERROR_TYPE_DEBUG,
1676 "Created NAT WAIT connection to `%4s' at `%s'\n",
1677 GNUNET_i2s (&session->target),
1678 GNUNET_a2s (sb, sbs));
1679 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1685 LOG(GNUNET_ERROR_TYPE_DEBUG,
1686 "Running NAT client for `%4s' at `%s' failed\n",
1687 GNUNET_i2s (&session->target),
1688 GNUNET_a2s (sb, sbs));
1689 tcp_plugin_disconnect_session (plugin,
1695 /* create new outbound session */
1696 GNUNET_assert(plugin->cur_connections <= plugin->max_connections);
1698 if (0 != (options & TCP_OPTIONS_TCP_STEALTH))
1701 s = GNUNET_NETWORK_socket_create (af, SOCK_STREAM, 0);
1704 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
1711 GNUNET_NETWORK_socket_setsockopt (s,
1715 sizeof (struct GNUNET_PeerIdentity))) ||
1717 GNUNET_NETWORK_socket_setsockopt (s,
1719 TCP_STEALTH_INTEGRITY,
1720 &plugin->my_welcome,
1721 sizeof (struct WelcomeMessage))) )
1723 /* TCP STEALTH not supported by kernel */
1724 GNUNET_break (GNUNET_OK ==
1725 GNUNET_NETWORK_socket_close (s));
1730 sa = GNUNET_CONNECTION_connect_socket (s, sb, sbs);
1739 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1743 LOG (GNUNET_ERROR_TYPE_DEBUG,
1744 "Failed to create connection to `%4s' at `%s'\n",
1745 GNUNET_i2s (&address->peer),
1746 GNUNET_a2s (sb, sbs));
1749 plugin->cur_connections++;
1750 if (plugin->cur_connections == plugin->max_connections)
1751 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
1753 LOG (GNUNET_ERROR_TYPE_DEBUG,
1754 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1755 GNUNET_i2s (&address->peer),
1756 GNUNET_a2s (sb, sbs));
1758 session = create_session (plugin,
1760 GNUNET_SERVER_connect_socket (plugin->server, sa),
1762 session->ats_address_network_type = net_type;
1763 GNUNET_break (session->ats_address_network_type != GNUNET_ATS_NET_UNSPECIFIED);
1764 GNUNET_SERVER_client_set_user_context(session->client, session);
1765 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1768 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1769 LOG (GNUNET_ERROR_TYPE_DEBUG,
1770 "Creating new session for `%s' address `%s' session %p\n",
1771 GNUNET_i2s (&address->peer),
1772 tcp_plugin_address_to_string (plugin,
1774 address->address_length),
1776 /* Send TCP Welcome */
1777 process_pending_messages (session);
1784 session_disconnect_it (void *cls,
1785 const struct GNUNET_PeerIdentity *key,
1788 struct Plugin *plugin = cls;
1789 struct Session *session = value;
1791 GNUNET_STATISTICS_update (session->plugin->env->stats,
1792 gettext_noop ("# transport-service disconnect requests for TCP"),
1795 tcp_plugin_disconnect_session (plugin,
1802 * Function that can be called to force a disconnect from the
1803 * specified neighbour. This should also cancel all previously
1804 * scheduled transmissions. Obviously the transmission may have been
1805 * partially completed already, which is OK. The plugin is supposed
1806 * to close the connection (if applicable) and no longer call the
1807 * transmit continuation(s).
1809 * Finally, plugin MUST NOT call the services's receive function to
1810 * notify the service that the connection to the specified target was
1811 * closed after a getting this call.
1813 * @param cls closure
1814 * @param target peer for which the last transmission is
1818 tcp_plugin_disconnect (void *cls,
1819 const struct GNUNET_PeerIdentity *target)
1821 struct Plugin *plugin = cls;
1823 LOG(GNUNET_ERROR_TYPE_DEBUG,
1824 "Disconnecting peer `%4s'\n",
1825 GNUNET_i2s (target));
1826 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1828 &session_disconnect_it,
1830 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns,
1832 &session_disconnect_it,
1838 * Running pretty printers: head
1840 static struct PrettyPrinterContext *ppc_dll_head;
1843 * Running pretty printers: tail
1845 static struct PrettyPrinterContext *ppc_dll_tail;
1848 * Context for address to string conversion, closure
1849 * for #append_port().
1851 struct PrettyPrinterContext
1856 struct PrettyPrinterContext *next;
1861 struct PrettyPrinterContext *prev;
1866 struct GNUNET_SCHEDULER_Task * timeout_task;
1871 struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
1874 * Function to call with the result.
1876 GNUNET_TRANSPORT_AddressStringCallback asc;
1879 * Clsoure for @e asc.
1884 * Port to add after the IP address.
1901 * Append our port and forward the result.
1903 * @param cls the `struct PrettyPrinterContext *`
1904 * @param hostname hostname part of the address
1907 append_port (void *cls,
1908 const char *hostname)
1910 struct PrettyPrinterContext *ppc = cls;
1913 if (NULL == hostname)
1915 /* Final call, done */
1916 ppc->resolver_handle = NULL;
1917 GNUNET_CONTAINER_DLL_remove (ppc_dll_head,
1920 ppc->asc (ppc->asc_cls,
1926 if (GNUNET_YES == ppc->ipv6)
1927 GNUNET_asprintf (&ret,
1934 GNUNET_asprintf (&ret,
1940 ppc->asc (ppc->asc_cls,
1948 * Convert the transports address to a nice, human-readable
1951 * @param cls closure
1952 * @param type name of the transport that generated the address
1953 * @param addr one of the addresses of the host, NULL for the last address
1954 * the specific address format depends on the transport
1955 * @param addrlen length of the @a addr
1956 * @param numeric should (IP) addresses be displayed in numeric form?
1957 * @param timeout after how long should we give up?
1958 * @param asc function to call on each string
1959 * @param asc_cls closure for @a asc
1962 tcp_plugin_address_pretty_printer (void *cls,
1967 struct GNUNET_TIME_Relative timeout,
1968 GNUNET_TRANSPORT_AddressStringCallback asc,
1971 struct PrettyPrinterContext *ppc;
1974 struct sockaddr_in a4;
1975 struct sockaddr_in6 a6;
1976 const struct IPv4TcpAddress *t4;
1977 const struct IPv6TcpAddress *t6;
1981 if (sizeof(struct IPv6TcpAddress) == addrlen)
1984 memset (&a6, 0, sizeof(a6));
1985 a6.sin6_family = AF_INET6;
1986 a6.sin6_port = t6->t6_port;
1987 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1988 port = ntohs (t6->t6_port);
1989 options = ntohl (t6->options);
1993 else if (sizeof(struct IPv4TcpAddress) == addrlen)
1996 memset (&a4, 0, sizeof(a4));
1997 a4.sin_family = AF_INET;
1998 a4.sin_port = t4->t4_port;
1999 a4.sin_addr.s_addr = t4->ipv4_addr;
2000 port = ntohs (t4->t4_port);
2001 options = ntohl (t4->options);
2007 /* invalid address */
2008 asc (asc_cls, NULL, GNUNET_SYSERR);
2009 asc (asc_cls, NULL, GNUNET_OK);
2012 ppc = GNUNET_new (struct PrettyPrinterContext);
2013 if (addrlen == sizeof(struct IPv6TcpAddress))
2014 ppc->ipv6 = GNUNET_YES;
2016 ppc->ipv6 = GNUNET_NO;
2018 ppc->asc_cls = asc_cls;
2020 ppc->options = options;
2021 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb,
2026 if (NULL == ppc->resolver_handle)
2032 GNUNET_CONTAINER_DLL_insert (ppc_dll_head,
2039 * Check if the given port is plausible (must be either our listen
2040 * port or our advertised port), or any port if we are behind NAT
2041 * and do not have a port open. If it is neither, we return
2044 * @param plugin global variables
2045 * @param in_port port number to check
2046 * @return #GNUNET_OK if port is either open_port or adv_port
2049 check_port (struct Plugin *plugin, uint16_t in_port)
2051 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
2053 return GNUNET_SYSERR;
2057 * Function that will be called to check if a binary address for this
2058 * plugin is well-formed and corresponds to an address for THIS peer
2059 * (as per our configuration). Naturally, if absolutely necessary,
2060 * plugins can be a bit conservative in their answer, but in general
2061 * plugins should make sure that the address does not redirect
2062 * traffic to a 3rd party that might try to man-in-the-middle our
2065 * @param cls closure, our `struct Plugin *`
2066 * @param addr pointer to the address
2067 * @param addrlen length of addr
2068 * @return #GNUNET_OK if this is a plausible address for this peer
2069 * and transport, #GNUNET_SYSERR if not
2072 tcp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
2074 struct Plugin *plugin = cls;
2075 struct IPv4TcpAddress *v4;
2076 struct IPv6TcpAddress *v6;
2078 if ((addrlen != sizeof(struct IPv4TcpAddress))
2079 && (addrlen != sizeof(struct IPv6TcpAddress)))
2082 return GNUNET_SYSERR;
2085 if (addrlen == sizeof(struct IPv4TcpAddress))
2087 v4 = (struct IPv4TcpAddress *) addr;
2088 if (0 != memcmp (&v4->options,
2093 return GNUNET_SYSERR;
2095 if (GNUNET_OK != check_port (plugin, ntohs (v4->t4_port)))
2096 return GNUNET_SYSERR;
2098 != GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
2099 sizeof(struct in_addr)))
2100 return GNUNET_SYSERR;
2104 v6 = (struct IPv6TcpAddress *) addr;
2105 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
2108 return GNUNET_SYSERR;
2110 if (0 != memcmp (&v6->options,
2115 return GNUNET_SYSERR;
2117 if (GNUNET_OK != check_port (plugin, ntohs (v6->t6_port)))
2118 return GNUNET_SYSERR;
2120 != GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
2121 sizeof(struct in6_addr)))
2122 return GNUNET_SYSERR;
2128 * We've received a nat probe from this peer via TCP. Finish
2129 * creating the client session and resume sending of queued
2132 * @param cls closure
2133 * @param client identification of the client
2134 * @param message the actual message
2137 handle_tcp_nat_probe (void *cls,
2138 struct GNUNET_SERVER_Client *client,
2139 const struct GNUNET_MessageHeader *message)
2141 struct Plugin *plugin = cls;
2142 struct Session *session;
2143 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
2146 struct IPv4TcpAddress *t4;
2147 struct IPv6TcpAddress *t6;
2148 const struct sockaddr_in *s4;
2149 const struct sockaddr_in6 *s6;
2151 LOG (GNUNET_ERROR_TYPE_DEBUG,
2152 "Received NAT probe\n");
2153 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
2154 * a connection to this peer by running gnunet-nat-client. This peer
2155 * received the punch message and now wants us to use the new connection
2156 * as the default for that peer. Do so and then send a WELCOME message
2157 * so we can really be connected!
2159 if (ntohs (message->size) != sizeof(struct TCP_NAT_ProbeMessage))
2162 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2166 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
2167 if (0 == memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
2168 sizeof(struct GNUNET_PeerIdentity)))
2170 /* refuse connections from ourselves */
2171 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2175 session = GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
2176 &tcp_nat_probe->clientIdentity);
2177 if (session == NULL)
2179 LOG (GNUNET_ERROR_TYPE_DEBUG,
2180 "Did NOT find session for NAT probe!\n");
2181 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2184 LOG (GNUNET_ERROR_TYPE_DEBUG,
2185 "Found session for NAT probe!\n");
2187 if (session->nat_connection_timeout != NULL)
2189 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
2190 session->nat_connection_timeout = NULL;
2193 if (GNUNET_OK != GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2196 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2197 tcp_plugin_disconnect_session (plugin,
2202 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns, &tcp_nat_probe->clientIdentity, session) == GNUNET_YES);
2203 GNUNET_SERVER_client_set_user_context(client, session);
2204 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap, &session->target,
2205 session, 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, GNUNET_SYSERR);
2242 tcp_plugin_disconnect_session (plugin,
2247 GNUNET_break(NULL == session->client);
2248 GNUNET_SERVER_client_keep (client);
2249 session->client = client;
2250 GNUNET_STATISTICS_update (plugin->env->stats,
2251 gettext_noop ("# TCP sessions active"), 1, GNUNET_NO);
2252 process_pending_messages (session);
2253 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2257 * We've received a welcome from this peer via TCP. Possibly create a
2258 * fresh client record and send back our welcome.
2260 * @param cls closure
2261 * @param client identification of the client
2262 * @param message the actual message
2265 handle_tcp_welcome (void *cls,
2266 struct GNUNET_SERVER_Client *client,
2267 const struct GNUNET_MessageHeader *message)
2269 struct Plugin *plugin = cls;
2270 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2271 struct GNUNET_HELLO_Address *address;
2272 struct Session *session;
2275 struct IPv4TcpAddress t4;
2276 struct IPv6TcpAddress t6;
2277 const struct sockaddr_in *s4;
2278 const struct sockaddr_in6 *s6;
2279 struct GNUNET_ATS_Information ats;
2282 if (0 == memcmp (&wm->clientIdentity,
2283 plugin->env->my_identity,
2284 sizeof(struct GNUNET_PeerIdentity)))
2286 /* refuse connections from ourselves */
2287 GNUNET_SERVER_receive_done (client,
2290 GNUNET_SERVER_client_get_address (client,
2294 LOG (GNUNET_ERROR_TYPE_INFO,
2295 "Received WELCOME message from my own identity `%4s' on address `%s'\n",
2296 GNUNET_i2s (&wm->clientIdentity),
2297 GNUNET_a2s (vaddr, alen));
2303 LOG(GNUNET_ERROR_TYPE_DEBUG,
2304 "Received WELCOME message from `%4s' %p\n",
2305 GNUNET_i2s (&wm->clientIdentity),
2307 GNUNET_STATISTICS_update (plugin->env->stats,
2308 gettext_noop ("# TCP WELCOME messages received"),
2311 session = lookup_session_by_client (plugin, client);
2312 if (NULL != session)
2315 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2317 LOG (GNUNET_ERROR_TYPE_DEBUG,
2318 "Found existing session %p for peer `%s'\n",
2320 GNUNET_a2s (vaddr, alen));
2321 GNUNET_free (vaddr);
2326 GNUNET_SERVER_client_keep (client);
2327 if (NULL != plugin->service) /* Otherwise value is incremented in tcp_access_check */
2328 plugin->cur_connections++;
2329 if (plugin->cur_connections == plugin->max_connections)
2330 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2333 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2335 if (alen == sizeof(struct sockaddr_in))
2338 memset (&t4, '\0', sizeof (t4));
2339 t4.options = htonl (TCP_OPTIONS_NONE);
2340 t4.t4_port = s4->sin_port;
2341 t4.ipv4_addr = s4->sin_addr.s_addr;
2342 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2346 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2348 else if (alen == sizeof(struct sockaddr_in6))
2351 memset (&t6, '\0', sizeof (t6));
2352 t6.options = htonl (TCP_OPTIONS_NONE);
2353 t6.t6_port = s6->sin6_port;
2354 memcpy (&t6.ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2355 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2359 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2364 GNUNET_free_non_null (vaddr);
2367 session = create_session (plugin,
2371 GNUNET_HELLO_address_free (address);
2372 session->ats_address_network_type
2373 = plugin->env->get_address_type (plugin->env->cls,
2376 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
2377 ats.value = htonl (session->ats_address_network_type);
2378 LOG (GNUNET_ERROR_TYPE_DEBUG,
2379 "Creating new%s session %p for peer `%s' client %p \n",
2380 GNUNET_HELLO_address_check_option (session->address,
2381 GNUNET_HELLO_ADDRESS_INFO_INBOUND)
2384 tcp_plugin_address_to_string (plugin,
2385 session->address->address,
2386 session->address->address_length),
2388 GNUNET_free (vaddr);
2389 GNUNET_SERVER_client_set_user_context (session->client, session);
2390 GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2393 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2394 /* Notify transport and ATS about new session */
2395 plugin->env->session_start (plugin->env->cls,
2399 notify_session_monitor (plugin,
2401 GNUNET_TRANSPORT_SS_INIT);
2405 LOG(GNUNET_ERROR_TYPE_DEBUG,
2406 "Did not obtain TCP socket address for incoming connection\n");
2412 if (session->expecting_welcome != GNUNET_YES)
2415 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2419 session->last_activity = GNUNET_TIME_absolute_get ();
2420 session->expecting_welcome = GNUNET_NO;
2422 process_pending_messages (session);
2423 GNUNET_SERVER_client_set_timeout (client,
2424 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2425 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2430 * We've received data for this peer via TCP. Unbox,
2431 * compute latency and forward.
2433 * @param cls closure
2434 * @param client identification of the client
2435 * @param message the actual message
2438 handle_tcp_data (void *cls,
2439 struct GNUNET_SERVER_Client *client,
2440 const struct GNUNET_MessageHeader *message)
2442 struct Plugin *plugin = cls;
2443 struct Session *session;
2444 struct GNUNET_TIME_Relative delay;
2446 struct GNUNET_ATS_Information distance;
2448 type = ntohs (message->type);
2449 if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2450 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
2452 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2453 GNUNET_SERVER_receive_done (client,
2457 session = lookup_session_by_client (plugin, client);
2458 if (NULL == session)
2460 /* No inbound session found */
2464 GNUNET_SERVER_client_get_address (client,
2467 LOG (GNUNET_ERROR_TYPE_ERROR,
2468 "Received unexpected %u bytes of type %u from `%s'\n",
2469 (unsigned int) ntohs (message->size),
2470 (unsigned int) ntohs (message->type),
2474 GNUNET_SERVER_receive_done (client,
2476 GNUNET_free_non_null (vaddr);
2479 else if (GNUNET_YES == session->expecting_welcome)
2481 /* Session is expecting WELCOME message */
2485 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2486 LOG (GNUNET_ERROR_TYPE_ERROR,
2487 "Received unexpected %u bytes of type %u from `%s'\n",
2488 (unsigned int) ntohs (message->size),
2489 (unsigned int) ntohs (message->type),
2490 GNUNET_a2s (vaddr, alen));
2492 GNUNET_SERVER_receive_done (client,
2494 GNUNET_free_non_null (vaddr);
2498 session->last_activity = GNUNET_TIME_absolute_get ();
2499 LOG (GNUNET_ERROR_TYPE_DEBUG,
2500 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2501 (unsigned int) ntohs (message->size),
2502 (unsigned int) ntohs (message->type),
2503 GNUNET_i2s (&session->target));
2505 GNUNET_STATISTICS_update (plugin->env->stats,
2506 gettext_noop ("# bytes received via TCP"),
2507 ntohs (message->size),
2510 distance.type = htonl (GNUNET_ATS_NETWORK_TYPE);
2511 distance.value = htonl ((uint32_t) session->ats_address_network_type);
2512 GNUNET_break (session->ats_address_network_type != GNUNET_ATS_NET_UNSPECIFIED);
2514 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2517 delay = plugin->env->receive (plugin->env->cls,
2521 plugin->env->update_address_metrics (plugin->env->cls,
2525 reschedule_session_timeout (session);
2526 if (0 == delay.rel_value_us)
2528 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2532 LOG(GNUNET_ERROR_TYPE_DEBUG,
2533 "Throttling receiving from `%s' for %s\n",
2534 GNUNET_i2s (&session->target),
2535 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
2536 GNUNET_SERVER_disable_receive_done_warning (client);
2537 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
2538 &delayed_done, session);
2544 * Functions with this signature are called whenever a peer
2545 * is disconnected on the network level.
2547 * @param cls closure
2548 * @param client identification of the client
2551 disconnect_notify (void *cls,
2552 struct GNUNET_SERVER_Client *client)
2554 struct Plugin *plugin = cls;
2555 struct Session *session;
2559 session = lookup_session_by_client (plugin, client);
2560 if (NULL == session)
2561 return; /* unknown, nothing to do */
2562 LOG (GNUNET_ERROR_TYPE_DEBUG,
2563 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2564 GNUNET_i2s (&session->target),
2565 tcp_plugin_address_to_string (session->plugin,
2566 session->address->address,
2567 session->address->address_length));
2569 if (plugin->cur_connections == plugin->max_connections)
2570 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2572 if (plugin->cur_connections < 1)
2575 plugin->cur_connections--;
2577 GNUNET_STATISTICS_update (session->plugin->env->stats, gettext_noop
2578 ("# network-level TCP disconnect events"),
2581 tcp_plugin_disconnect_session (plugin, session);
2586 * We can now send a probe message, copy into buffer to really send.
2588 * @param cls closure, a struct TCPProbeContext
2589 * @param size max size to copy
2590 * @param buf buffer to copy message to
2591 * @return number of bytes copied into @a buf
2594 notify_send_probe (void *cls,
2598 struct TCPProbeContext *tcp_probe_ctx = cls;
2599 struct Plugin *plugin = tcp_probe_ctx->plugin;
2602 tcp_probe_ctx->transmit_handle = NULL;
2603 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
2608 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2609 GNUNET_free(tcp_probe_ctx);
2612 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2613 memcpy (buf, &tcp_probe_ctx->message, sizeof(tcp_probe_ctx->message));
2614 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2615 tcp_probe_ctx->sock);
2616 ret = sizeof(tcp_probe_ctx->message);
2617 GNUNET_free(tcp_probe_ctx);
2623 * Function called by the NAT subsystem suggesting another peer wants
2624 * to connect to us via connection reversal. Try to connect back to the
2627 * @param cls closure
2628 * @param addr address to try
2629 * @param addrlen number of bytes in @a addr
2632 try_connection_reversal (void *cls,
2633 const struct sockaddr *addr,
2636 struct Plugin *plugin = cls;
2637 struct GNUNET_CONNECTION_Handle *sock;
2638 struct TCPProbeContext *tcp_probe_ctx;
2641 * We have received an ICMP response, ostensibly from a peer
2642 * that wants to connect to us! Send a message to establish a connection.
2644 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET, addr, addrlen);
2647 /* failed for some odd reason (out of sockets?); ignore attempt */
2651 tcp_probe_ctx = GNUNET_new (struct TCPProbeContext);
2652 tcp_probe_ctx->message.header.size
2653 = htons (sizeof (struct TCP_NAT_ProbeMessage));
2654 tcp_probe_ctx->message.header.type
2655 = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2656 tcp_probe_ctx->message.clientIdentity
2657 = *plugin->env->my_identity;
2658 tcp_probe_ctx->plugin = plugin;
2659 tcp_probe_ctx->sock = sock;
2660 GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
2663 tcp_probe_ctx->transmit_handle
2664 = GNUNET_CONNECTION_notify_transmit_ready (sock,
2665 ntohs (tcp_probe_ctx->message.header.size),
2666 GNUNET_TIME_UNIT_FOREVER_REL,
2673 * Function obtain the network type for a session
2675 * @param cls closure ('struct Plugin*')
2676 * @param session the session
2677 * @return the network type in HBO or #GNUNET_SYSERR
2679 static enum GNUNET_ATS_Network_Type
2680 tcp_plugin_get_network (void *cls,
2681 struct Session *session)
2683 return session->ats_address_network_type;
2688 * Return information about the given session to the
2691 * @param cls the `struct Plugin` with the monitor callback (`sic`)
2692 * @param peer peer we send information about
2693 * @param value our `struct Session` to send information about
2694 * @return #GNUNET_OK (continue to iterate)
2697 send_session_info_iter (void *cls,
2698 const struct GNUNET_PeerIdentity *peer,
2701 struct Plugin *plugin = cls;
2702 struct Session *session = value;
2704 notify_session_monitor (plugin,
2706 GNUNET_TRANSPORT_SS_INIT);
2707 /* FIXME: cannot tell if this is up or not from current
2709 notify_session_monitor (plugin,
2711 GNUNET_TRANSPORT_SS_UP);
2717 * Begin monitoring sessions of a plugin. There can only
2718 * be one active monitor per plugin (i.e. if there are
2719 * multiple monitors, the transport service needs to
2720 * multiplex the generated events over all of them).
2722 * @param cls closure of the plugin
2723 * @param sic callback to invoke, NULL to disable monitor;
2724 * plugin will being by iterating over all active
2725 * sessions immediately and then enter monitor mode
2726 * @param sic_cls closure for @a sic
2729 tcp_plugin_setup_monitor (void *cls,
2730 GNUNET_TRANSPORT_SessionInfoCallback sic,
2733 struct Plugin *plugin = cls;
2736 plugin->sic_cls = sic_cls;
2739 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2740 &send_session_info_iter,
2742 /* signal end of first iteration */
2743 sic (sic_cls, NULL, NULL);
2749 * Entry point for the plugin.
2751 * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *`
2752 * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error
2755 libgnunet_plugin_transport_tcp_init (void *cls)
2757 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2758 { &handle_tcp_welcome, NULL,
2759 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2760 sizeof(struct WelcomeMessage) },
2761 { &handle_tcp_nat_probe, NULL,
2762 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2763 sizeof(struct TCP_NAT_ProbeMessage) },
2764 { &handle_tcp_data, NULL,
2765 GNUNET_MESSAGE_TYPE_ALL, 0 },
2766 { NULL, NULL, 0, 0 }
2768 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2769 struct GNUNET_TRANSPORT_PluginFunctions *api;
2770 struct Plugin *plugin;
2771 struct GNUNET_SERVICE_Context *service;
2772 unsigned long long aport;
2773 unsigned long long bport;
2774 unsigned long long max_connections;
2776 struct GNUNET_TIME_Relative idle_timeout;
2778 struct GNUNET_NETWORK_Handle *const*lsocks;
2782 struct sockaddr **addrs;
2783 socklen_t *addrlens;
2785 if (NULL == env->receive)
2787 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2788 initialze the plugin or the API */
2789 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2791 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2792 api->address_to_string = &tcp_plugin_address_to_string;
2793 api->string_to_address = &tcp_plugin_string_to_address;
2797 GNUNET_assert (NULL != env->cfg);
2799 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2803 max_connections = 128;
2807 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2811 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2812 "ADVERTISED-PORT", &aport)) &&
2815 LOG(GNUNET_ERROR_TYPE_ERROR,
2816 _("Require valid port number for service `%s' in configuration!\n"),
2826 service = GNUNET_SERVICE_start ("transport-tcp",
2828 GNUNET_SERVICE_OPTION_NONE);
2829 if (NULL == service)
2831 LOG (GNUNET_ERROR_TYPE_WARNING,
2832 _("Failed to start service.\n"));
2840 plugin = GNUNET_new (struct Plugin);
2841 plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections,
2843 plugin->max_connections = max_connections;
2844 plugin->open_port = bport;
2845 plugin->adv_port = aport;
2847 plugin->my_welcome.header.size = htons (sizeof(struct WelcomeMessage));
2848 plugin->my_welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
2849 plugin->my_welcome.clientIdentity = *plugin->env->my_identity;
2851 if ( (NULL != service) &&
2853 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2858 plugin->myoptions |= TCP_OPTIONS_TCP_STEALTH;
2859 lsocks = GNUNET_SERVICE_get_listen_sockets (service);
2862 uint32_t len = sizeof (struct WelcomeMessage);
2864 for (i=0;NULL!=lsocks[i];i++)
2867 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2871 sizeof (struct GNUNET_PeerIdentity))) ||
2873 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2875 TCP_STEALTH_INTEGRITY_LEN,
2879 /* TCP STEALTH not supported by kernel */
2880 GNUNET_assert (0 == i);
2881 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2882 _("TCP_STEALTH not supported on this platform.\n"));
2888 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2889 _("TCP_STEALTH not supported on this platform.\n"));
2894 if ( (NULL != service) &&
2897 GNUNET_SERVICE_get_server_addresses ("transport-tcp",
2902 for (ret = ret_s-1; ret >= 0; ret--)
2903 LOG (GNUNET_ERROR_TYPE_INFO,
2904 "Binding to address `%s'\n",
2905 GNUNET_a2s (addrs[ret], addrlens[ret]));
2907 = GNUNET_NAT_register (env->cfg,
2910 (unsigned int) ret_s,
2911 (const struct sockaddr **) addrs, addrlens,
2912 &tcp_nat_port_map_callback,
2913 &try_connection_reversal,
2915 for (ret = ret_s -1; ret >= 0; ret--)
2916 GNUNET_free (addrs[ret]);
2917 GNUNET_free_non_null (addrs);
2918 GNUNET_free_non_null (addrlens);
2922 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
2929 &try_connection_reversal,
2932 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2934 api->send = &tcp_plugin_send;
2935 api->get_session = &tcp_plugin_get_session;
2936 api->disconnect_session = &tcp_plugin_disconnect_session;
2937 api->query_keepalive_factor = &tcp_plugin_query_keepalive_factor;
2938 api->disconnect_peer = &tcp_plugin_disconnect;
2939 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2940 api->check_address = &tcp_plugin_check_address;
2941 api->address_to_string = &tcp_plugin_address_to_string;
2942 api->string_to_address = &tcp_plugin_string_to_address;
2943 api->get_network = &tcp_plugin_get_network;
2944 api->update_session_timeout = &tcp_plugin_update_session_timeout;
2945 api->update_inbound_delay = &tcp_plugin_update_inbound_delay;
2946 api->setup_monitor = &tcp_plugin_setup_monitor;
2947 plugin->service = service;
2948 if (NULL != service)
2950 plugin->server = GNUNET_SERVICE_get_server (service);
2955 GNUNET_CONFIGURATION_get_value_time (env->cfg,
2960 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
2966 = GNUNET_SERVER_create_with_sockets (&plugin_tcp_access_check,
2968 idle_timeout, GNUNET_YES);
2970 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
2971 memcpy (plugin->handlers, my_handlers, sizeof(my_handlers));
2972 for (i = 0;i < sizeof(my_handlers) / sizeof(struct GNUNET_SERVER_MessageHandler);i++)
2973 plugin->handlers[i].callback_cls = plugin;
2975 GNUNET_SERVER_add_handlers (plugin->server,
2977 GNUNET_SERVER_disconnect_notify (plugin->server,
2980 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16,
2983 LOG (GNUNET_ERROR_TYPE_INFO,
2984 _("TCP transport listening on port %llu\n"),
2987 LOG (GNUNET_ERROR_TYPE_INFO,
2988 _("TCP transport not listening on any port (client only)\n"));
2989 if ( (aport != bport) &&
2991 LOG (GNUNET_ERROR_TYPE_INFO,
2992 _("TCP transport advertises itself as being on port %llu\n"),
2994 /* Initially set connections to 0 */
2995 GNUNET_assert(NULL != plugin->env->stats);
2996 GNUNET_STATISTICS_set (plugin->env->stats,
2997 gettext_noop ("# TCP sessions active"),
3003 if (NULL != plugin->nat)
3004 GNUNET_NAT_unregister (plugin->nat);
3005 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3006 if (NULL != service)
3007 GNUNET_SERVICE_stop (service);
3008 GNUNET_free (plugin);
3009 GNUNET_free_non_null (api);
3015 * Exit point from the plugin.
3017 * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions`
3021 libgnunet_plugin_transport_tcp_done (void *cls)
3023 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3024 struct Plugin *plugin = api->cls;
3025 struct TCPProbeContext *tcp_probe;
3026 struct PrettyPrinterContext *cur;
3027 struct PrettyPrinterContext *next;
3034 LOG (GNUNET_ERROR_TYPE_DEBUG,
3035 "Shutting down TCP plugin\n");
3037 /* Removing leftover sessions */
3038 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
3039 &session_disconnect_it,
3041 /* Removing leftover NAT sessions */
3042 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
3043 &session_disconnect_it,
3046 for (cur = ppc_dll_head; NULL != cur; cur = next)
3049 GNUNET_CONTAINER_DLL_remove (ppc_dll_head,
3052 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3053 cur->asc (cur->asc_cls, NULL, GNUNET_OK);
3057 if (NULL != plugin->service)
3058 GNUNET_SERVICE_stop (plugin->service);
3060 GNUNET_SERVER_destroy (plugin->server);
3061 GNUNET_free(plugin->handlers);
3062 if (NULL != plugin->nat)
3063 GNUNET_NAT_unregister (plugin->nat);
3064 while (NULL != (tcp_probe = plugin->probe_head))
3066 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
3069 GNUNET_CONNECTION_destroy (tcp_probe->sock);
3070 GNUNET_free(tcp_probe);
3072 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
3073 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3074 GNUNET_free(plugin);
3079 /* end of plugin_transport_tcp.c */