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21 * @file transport/plugin_transport_tcp.c
22 * @brief Implementation of the TCP transport service
23 * @author Christian Grothoff
26 #include "gnunet_hello_lib.h"
27 #include "gnunet_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`
157 uint32_t options GNUNET_PACKED;
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`
180 uint32_t options GNUNET_PACKED;
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.
251 struct GNUNET_ATS_Session
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 GNUNET_ATS_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 GNUNET_ATS_Session *
811 lookup_session_by_client (struct Plugin *plugin,
812 struct GNUNET_SERVER_Client *client)
814 return GNUNET_SERVER_client_get_user_context (client,
815 struct GNUNET_ATS_Session);
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 GNUNET_ATS_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 GNUNET_ATS_Session` of the idle session
962 session_timeout (void *cls)
964 struct GNUNET_ATS_Session *s = cls;
965 struct GNUNET_TIME_Relative left;
967 s->timeout_task = NULL;
968 left = GNUNET_TIME_absolute_get_remaining (s->timeout);
969 if (0 != left.rel_value_us)
971 /* not actually our turn yet, but let's at least update
972 the monitor, it may think we're about to die ... */
973 notify_session_monitor (s->plugin,
975 GNUNET_TRANSPORT_SS_UPDATE);
976 s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
981 LOG (GNUNET_ERROR_TYPE_DEBUG,
982 "Session %p was idle for %s, disconnecting\n",
984 GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
986 /* call session destroy function */
987 tcp_plugin_disconnect_session (s->plugin,
993 * Increment session timeout due to activity.
995 * @param s session to increment timeout for
998 reschedule_session_timeout (struct GNUNET_ATS_Session *s)
1000 GNUNET_assert (NULL != s->timeout_task);
1001 s->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1006 * Create a new session. Also queues a welcome message.
1008 * @param plugin the plugin
1009 * @param address the address to create the session for
1010 * @param scope network scope the address is from
1011 * @param client client to use, reference counter must have already been increased
1012 * @param is_nat this a NAT session, we should wait for a client to
1013 * connect to us from an address, then assign that to
1015 * @return new session object
1017 static struct GNUNET_ATS_Session *
1018 create_session (struct Plugin *plugin,
1019 const struct GNUNET_HELLO_Address *address,
1020 enum GNUNET_ATS_Network_Type scope,
1021 struct GNUNET_SERVER_Client *client,
1024 struct GNUNET_ATS_Session *session;
1025 struct PendingMessage *pm;
1027 if (GNUNET_YES != is_nat)
1028 GNUNET_assert (NULL != client);
1030 GNUNET_assert (NULL == client);
1032 LOG (GNUNET_ERROR_TYPE_DEBUG,
1033 "Creating new session for peer `%4s' at address %s\n",
1034 GNUNET_i2s (&address->peer),
1035 tcp_plugin_address_to_string (plugin,
1037 address->address_length));
1038 session = GNUNET_new (struct GNUNET_ATS_Session);
1039 session->last_activity = GNUNET_TIME_absolute_get ();
1040 session->plugin = plugin;
1041 session->is_nat = is_nat;
1044 session->client = client;
1045 GNUNET_SERVER_client_set_user_context (client,
1048 session->address = GNUNET_HELLO_address_copy (address);
1049 session->target = address->peer;
1050 session->expecting_welcome = GNUNET_YES;
1051 session->scope = scope;
1052 pm = GNUNET_malloc (sizeof (struct PendingMessage) +
1053 sizeof (struct WelcomeMessage));
1054 pm->msg = (const char *) &pm[1];
1055 pm->message_size = sizeof(struct WelcomeMessage);
1057 &plugin->my_welcome,
1058 sizeof(struct WelcomeMessage));
1059 pm->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1060 GNUNET_STATISTICS_update (plugin->env->stats,
1061 gettext_noop ("# bytes currently in TCP buffers"),
1064 GNUNET_CONTAINER_DLL_insert (session->pending_messages_head,
1065 session->pending_messages_tail,
1067 session->msgs_in_queue++;
1068 session->bytes_in_queue += pm->message_size;
1069 session->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1070 session->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1073 notify_session_monitor (session->plugin,
1075 GNUNET_TRANSPORT_SS_INIT);
1076 if (GNUNET_YES != is_nat)
1078 GNUNET_STATISTICS_update (plugin->env->stats,
1079 gettext_noop ("# TCP sessions active"),
1082 notify_session_monitor (session->plugin,
1084 GNUNET_TRANSPORT_SS_UP);
1088 notify_session_monitor (session->plugin,
1090 GNUNET_TRANSPORT_SS_HANDSHAKE);
1097 * If we have pending messages, ask the server to
1098 * transmit them (schedule the respective tasks, etc.)
1100 * @param session for which session should we do this
1103 process_pending_messages (struct GNUNET_ATS_Session *session);
1107 * Function called to notify a client about the socket
1108 * being ready to queue more data. "buf" will be
1109 * NULL and "size" zero if the socket was closed for
1110 * writing in the meantime.
1112 * @param cls closure
1113 * @param size number of bytes available in @a buf
1114 * @param buf where the callee should write the message
1115 * @return number of bytes written to @a buf
1118 do_transmit (void *cls,
1122 struct GNUNET_ATS_Session *session = cls;
1123 struct GNUNET_PeerIdentity pid;
1124 struct Plugin *plugin;
1125 struct PendingMessage *pos;
1126 struct PendingMessage *hd;
1127 struct PendingMessage *tl;
1128 struct GNUNET_TIME_Absolute now;
1132 session->transmit_handle = NULL;
1133 plugin = session->plugin;
1136 LOG (GNUNET_ERROR_TYPE_DEBUG,
1137 "Timeout trying to transmit to peer `%4s', discarding message queue.\n",
1138 GNUNET_i2s (&session->target));
1139 /* timeout; cancel all messages that have already expired */
1143 now = GNUNET_TIME_absolute_get ();
1144 while ( (NULL != (pos = session->pending_messages_head)) &&
1145 (pos->timeout.abs_value_us <= now.abs_value_us) )
1147 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1148 session->pending_messages_tail,
1150 GNUNET_assert (0 < session->msgs_in_queue);
1151 session->msgs_in_queue--;
1152 GNUNET_assert (pos->message_size <= session->bytes_in_queue);
1153 session->bytes_in_queue -= pos->message_size;
1154 LOG (GNUNET_ERROR_TYPE_DEBUG,
1155 "Failed to transmit %u byte message to `%4s'.\n",
1157 GNUNET_i2s (&session->target));
1158 ret += pos->message_size;
1159 GNUNET_CONTAINER_DLL_insert_after (hd,
1164 /* do this call before callbacks (so that if callbacks destroy
1165 * session, they have a chance to cancel actions done by this
1167 process_pending_messages (session);
1168 pid = session->target;
1169 /* no do callbacks and do not use session again since
1170 * the callbacks may abort the session */
1171 while (NULL != (pos = hd))
1173 GNUNET_CONTAINER_DLL_remove (hd,
1176 if (NULL != pos->transmit_cont)
1177 pos->transmit_cont (pos->transmit_cont_cls,
1184 GNUNET_STATISTICS_update (plugin->env->stats,
1185 gettext_noop ("# bytes currently in TCP buffers"), -(int64_t) ret,
1187 GNUNET_STATISTICS_update (plugin->env->stats,
1188 gettext_noop ("# bytes discarded by TCP (timeout)"),
1192 notify_session_monitor (session->plugin,
1194 GNUNET_TRANSPORT_SS_UPDATE);
1197 /* copy all pending messages that would fit */
1202 while (NULL != (pos = session->pending_messages_head))
1204 if (ret + pos->message_size > size)
1206 GNUNET_CONTAINER_DLL_remove (session->pending_messages_head,
1207 session->pending_messages_tail,
1209 GNUNET_assert (0 < session->msgs_in_queue);
1210 session->msgs_in_queue--;
1211 GNUNET_assert (pos->message_size <= session->bytes_in_queue);
1212 session->bytes_in_queue -= pos->message_size;
1213 GNUNET_assert(size >= pos->message_size);
1214 LOG (GNUNET_ERROR_TYPE_DEBUG,
1215 "Transmitting message of type %u size %u to peer %s at %s\n",
1216 ntohs (((struct GNUNET_MessageHeader *) pos->msg)->type),
1218 GNUNET_i2s (&session->target),
1219 tcp_plugin_address_to_string (session->plugin,
1220 session->address->address,
1221 session->address->address_length));
1222 /* FIXME: this memcpy can be up to 7% of our total runtime */
1226 cbuf += pos->message_size;
1227 ret += pos->message_size;
1228 size -= pos->message_size;
1229 GNUNET_CONTAINER_DLL_insert_tail (hd,
1233 notify_session_monitor (session->plugin,
1235 GNUNET_TRANSPORT_SS_UPDATE);
1236 /* schedule 'continuation' before callbacks so that callbacks that
1237 * cancel everything don't cause us to use a session that no longer
1239 process_pending_messages (session);
1240 session->last_activity = GNUNET_TIME_absolute_get ();
1241 pid = session->target;
1242 /* we'll now call callbacks that may cancel the session; hence
1243 * we should not use 'session' after this point */
1244 while (NULL != (pos = hd))
1246 GNUNET_CONTAINER_DLL_remove (hd, tl, pos);
1247 if (NULL != pos->transmit_cont)
1248 pos->transmit_cont (pos->transmit_cont_cls,
1252 pos->message_size); /* FIXME: include TCP overhead */
1255 GNUNET_assert (NULL == hd);
1256 GNUNET_assert (NULL == tl);
1257 GNUNET_STATISTICS_update (plugin->env->stats,
1258 gettext_noop ("# bytes currently in TCP buffers"),
1261 GNUNET_STATISTICS_update (plugin->env->stats,
1262 gettext_noop ("# bytes transmitted via TCP"),
1270 * If we have pending messages, ask the server to
1271 * transmit them (schedule the respective tasks, etc.)
1273 * @param session for which session should we do this
1276 process_pending_messages (struct GNUNET_ATS_Session *session)
1278 struct PendingMessage *pm;
1280 GNUNET_assert (NULL != session->client);
1281 if (NULL != session->transmit_handle)
1283 if (NULL == (pm = session->pending_messages_head))
1286 session->transmit_handle
1287 = GNUNET_SERVER_notify_transmit_ready (session->client,
1289 GNUNET_TIME_absolute_get_remaining (pm->timeout),
1296 * Function that can be used by the transport service to transmit
1297 * a message using the plugin. Note that in the case of a
1298 * peer disconnecting, the continuation MUST be called
1299 * prior to the disconnect notification itself. This function
1300 * will be called with this peer's HELLO message to initiate
1301 * a fresh connection to another peer.
1303 * @param cls closure
1304 * @param session which session must be used
1305 * @param msgbuf the message to transmit
1306 * @param msgbuf_size number of bytes in @a msgbuf
1307 * @param priority how important is the message (most plugins will
1308 * ignore message priority and just FIFO)
1309 * @param to how long to wait at most for the transmission (does not
1310 * require plugins to discard the message after the timeout,
1311 * just advisory for the desired delay; most plugins will ignore
1313 * @param cont continuation to call once the message has
1314 * been transmitted (or if the transport is ready
1315 * for the next transmission call; or if the
1316 * peer disconnected...); can be NULL
1317 * @param cont_cls closure for @a cont
1318 * @return number of bytes used (on the physical network, with overheads);
1319 * -1 on hard errors (i.e. address invalid); 0 is a legal value
1320 * and does NOT mean that the message was not transmitted (DV)
1323 tcp_plugin_send (void *cls,
1324 struct GNUNET_ATS_Session *session,
1327 unsigned int priority,
1328 struct GNUNET_TIME_Relative to,
1329 GNUNET_TRANSPORT_TransmitContinuation cont,
1332 struct Plugin * plugin = cls;
1333 struct PendingMessage *pm;
1335 /* create new message entry */
1336 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msgbuf_size);
1337 pm->msg = (const char *) &pm[1];
1338 memcpy (&pm[1], msgbuf, msgbuf_size);
1339 pm->message_size = msgbuf_size;
1340 pm->timeout = GNUNET_TIME_relative_to_absolute (to);
1341 pm->transmit_cont = cont;
1342 pm->transmit_cont_cls = cont_cls;
1344 LOG(GNUNET_ERROR_TYPE_DEBUG,
1345 "Asked to transmit %u bytes to `%s', added message to list.\n",
1347 GNUNET_i2s (&session->target));
1350 GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
1354 GNUNET_assert (NULL != session->client);
1355 GNUNET_SERVER_client_set_timeout (session->client,
1356 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1357 GNUNET_STATISTICS_update (plugin->env->stats,
1358 gettext_noop ("# bytes currently in TCP buffers"),
1362 /* append pm to pending_messages list */
1363 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1364 session->pending_messages_tail,
1366 notify_session_monitor (session->plugin,
1368 GNUNET_TRANSPORT_SS_UPDATE);
1369 session->msgs_in_queue++;
1370 session->bytes_in_queue += pm->message_size;
1371 process_pending_messages (session);
1375 GNUNET_CONTAINER_multipeermap_contains_value (plugin->nat_wait_conns,
1379 LOG (GNUNET_ERROR_TYPE_DEBUG,
1380 "This NAT WAIT session for peer `%s' is not yet ready!\n",
1381 GNUNET_i2s (&session->target));
1382 GNUNET_STATISTICS_update (plugin->env->stats,
1383 gettext_noop ("# bytes currently in TCP buffers"), msgbuf_size,
1385 /* append pm to pending_messages list */
1386 GNUNET_CONTAINER_DLL_insert_tail (session->pending_messages_head,
1387 session->pending_messages_tail,
1389 session->msgs_in_queue++;
1390 session->bytes_in_queue += pm->message_size;
1391 notify_session_monitor (session->plugin,
1393 GNUNET_TRANSPORT_SS_HANDSHAKE);
1396 LOG (GNUNET_ERROR_TYPE_ERROR,
1397 "Invalid session %p\n",
1407 return GNUNET_SYSERR; /* session does not exist here */
1412 * Closure for #session_lookup_it().
1414 struct GNUNET_ATS_SessionItCtx
1417 * Address we are looking for.
1419 const struct GNUNET_HELLO_Address *address;
1422 * Where to store the session (if we found it).
1424 struct GNUNET_ATS_Session *result;
1430 * Look for a session by address.
1432 * @param cls the `struct GNUNET_ATS_SessionItCtx`
1434 * @param value a `struct GNUNET_ATS_Session`
1435 * @return #GNUNET_YES to continue looking, #GNUNET_NO if we found the session
1438 session_lookup_it (void *cls,
1439 const struct GNUNET_PeerIdentity *key,
1442 struct GNUNET_ATS_SessionItCtx *si_ctx = cls;
1443 struct GNUNET_ATS_Session *session = value;
1446 GNUNET_HELLO_address_cmp (si_ctx->address,
1449 si_ctx->result = session;
1455 * Task cleaning up a NAT connection attempt after timeout
1457 * @param cls the `struct GNUNET_ATS_Session`
1460 nat_connect_timeout (void *cls)
1462 struct GNUNET_ATS_Session *session = cls;
1464 session->nat_connection_timeout = NULL;
1465 LOG (GNUNET_ERROR_TYPE_DEBUG,
1466 "NAT WAIT connection to `%4s' at `%s' could not be established, removing session\n",
1467 GNUNET_i2s (&session->target),
1468 tcp_plugin_address_to_string (session->plugin,
1469 session->address->address,
1470 session->address->address_length));
1471 tcp_plugin_disconnect_session (session->plugin,
1477 * Function that will be called whenever the transport service wants to
1478 * notify the plugin that a session is still active and in use and
1479 * therefore the session timeout for this session has to be updated
1481 * @param cls closure
1482 * @param peer which peer was the session for
1483 * @param session which session is being updated
1486 tcp_plugin_update_session_timeout (void *cls,
1487 const struct GNUNET_PeerIdentity *peer,
1488 struct GNUNET_ATS_Session *session)
1490 reschedule_session_timeout (session);
1495 * Task to signal the server that we can continue
1496 * receiving from the TCP client now.
1498 * @param cls the `struct GNUNET_ATS_Session *`
1501 delayed_done (void *cls)
1503 struct GNUNET_ATS_Session *session = cls;
1505 session->receive_delay_task = NULL;
1506 reschedule_session_timeout (session);
1507 GNUNET_SERVER_receive_done (session->client,
1513 * Function that will be called whenever the transport service wants to
1514 * notify the plugin that the inbound quota changed and that the plugin
1515 * should update it's delay for the next receive value
1517 * @param cls closure
1518 * @param peer which peer was the session for
1519 * @param session which session is being updated
1520 * @param delay new delay to use for receiving
1523 tcp_plugin_update_inbound_delay (void *cls,
1524 const struct GNUNET_PeerIdentity *peer,
1525 struct GNUNET_ATS_Session *session,
1526 struct GNUNET_TIME_Relative delay)
1528 if (NULL == session->receive_delay_task)
1530 LOG (GNUNET_ERROR_TYPE_DEBUG,
1531 "New inbound delay %s\n",
1532 GNUNET_STRINGS_relative_time_to_string (delay,
1534 session->receive_delay = GNUNET_TIME_relative_to_absolute (delay);
1535 GNUNET_SCHEDULER_cancel (session->receive_delay_task);
1536 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
1543 * Create a new session to transmit data to the target
1544 * This session will used to send data to this peer and the plugin will
1545 * notify us by calling the env->session_end function
1547 * @param cls closure
1548 * @param address the address to use
1549 * @return the session if the address is valid, NULL otherwise
1551 static struct GNUNET_ATS_Session *
1552 tcp_plugin_get_session (void *cls,
1553 const struct GNUNET_HELLO_Address *address)
1555 struct Plugin *plugin = cls;
1556 struct GNUNET_ATS_Session *session = NULL;
1560 struct GNUNET_CONNECTION_Handle *sa;
1561 struct sockaddr_in a4;
1562 struct sockaddr_in6 a6;
1563 const struct IPv4TcpAddress *t4;
1564 const struct IPv6TcpAddress *t6;
1565 unsigned int options;
1566 enum GNUNET_ATS_Network_Type net_type;
1567 unsigned int is_natd = GNUNET_NO;
1570 struct GNUNET_NETWORK_Handle *s;
1573 addrlen = address->address_length;
1574 LOG (GNUNET_ERROR_TYPE_DEBUG,
1575 "Trying to get session for `%s' address of peer `%s'\n",
1576 tcp_plugin_address_to_string (plugin,
1578 address->address_length),
1579 GNUNET_i2s (&address->peer));
1581 if (GNUNET_HELLO_address_check_option (address,
1582 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1588 /* look for existing session */
1590 GNUNET_CONTAINER_multipeermap_contains (plugin->sessionmap,
1593 struct GNUNET_ATS_SessionItCtx si_ctx;
1595 si_ctx.address = address;
1596 si_ctx.result = NULL;
1597 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1601 if (NULL != si_ctx.result)
1603 session = si_ctx.result;
1604 LOG (GNUNET_ERROR_TYPE_DEBUG,
1605 "Found existing session for `%s' address `%s'\n",
1606 GNUNET_i2s (&address->peer),
1607 tcp_plugin_address_to_string (plugin,
1609 address->address_length));
1614 if (addrlen == sizeof(struct IPv6TcpAddress))
1616 GNUNET_assert (NULL != address->address); /* make static analysis happy */
1617 t6 = address->address;
1618 options = t6->options;
1620 memset (&a6, 0, sizeof(a6));
1621 #if HAVE_SOCKADDR_IN_SIN_LEN
1622 a6.sin6_len = sizeof (a6);
1624 a6.sin6_family = AF_INET6;
1625 a6.sin6_port = t6->t6_port;
1626 if (t6->t6_port == 0)
1627 is_natd = GNUNET_YES;
1628 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1632 else if (addrlen == sizeof(struct IPv4TcpAddress))
1634 GNUNET_assert(NULL != address->address); /* make static analysis happy */
1635 t4 = address->address;
1636 options = t4->options;
1638 memset (&a4, 0, sizeof(a4));
1639 #if HAVE_SOCKADDR_IN_SIN_LEN
1640 a4.sin_len = sizeof (a4);
1642 a4.sin_family = AF_INET;
1643 a4.sin_port = t4->t4_port;
1644 if (t4->t4_port == 0)
1645 is_natd = GNUNET_YES;
1646 a4.sin_addr.s_addr = t4->ipv4_addr;
1652 GNUNET_STATISTICS_update (plugin->env->stats,
1653 gettext_noop ("# requests to create session with invalid address"),
1659 net_type = plugin->env->get_address_type (plugin->env->cls,
1662 GNUNET_break (net_type != GNUNET_ATS_NET_UNSPECIFIED);
1664 if ( (is_natd == GNUNET_YES) &&
1665 (addrlen == sizeof(struct IPv6TcpAddress)) )
1667 /* NAT client only works with IPv4 addresses */
1671 if (plugin->cur_connections >= plugin->max_connections)
1677 if ( (is_natd == GNUNET_YES) &&
1679 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1682 /* Only do one NAT punch attempt per peer identity */
1686 if ( (is_natd == GNUNET_YES) &&
1687 (NULL != plugin->nat) &&
1689 GNUNET_CONTAINER_multipeermap_contains (plugin->nat_wait_conns,
1692 LOG (GNUNET_ERROR_TYPE_DEBUG,
1693 "Found valid IPv4 NAT address (creating session)!\n");
1694 session = create_session (plugin,
1699 session->nat_connection_timeout = GNUNET_SCHEDULER_add_delayed (NAT_TIMEOUT,
1700 &nat_connect_timeout,
1702 GNUNET_assert (GNUNET_OK ==
1703 GNUNET_CONTAINER_multipeermap_put (plugin->nat_wait_conns,
1706 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1708 LOG (GNUNET_ERROR_TYPE_DEBUG,
1709 "Created NAT WAIT connection to `%4s' at `%s'\n",
1710 GNUNET_i2s (&session->target),
1711 GNUNET_a2s (sb, sbs));
1712 if (GNUNET_OK == GNUNET_NAT_run_client (plugin->nat, &a4))
1718 LOG(GNUNET_ERROR_TYPE_DEBUG,
1719 "Running NAT client for `%4s' at `%s' failed\n",
1720 GNUNET_i2s (&session->target),
1721 GNUNET_a2s (sb, sbs));
1722 tcp_plugin_disconnect_session (plugin,
1728 /* create new outbound session */
1729 if (0 != (options & TCP_OPTIONS_TCP_STEALTH))
1732 s = GNUNET_NETWORK_socket_create (af, SOCK_STREAM, 0);
1735 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
1742 GNUNET_NETWORK_socket_setsockopt (s,
1746 sizeof (struct GNUNET_PeerIdentity))) ||
1748 GNUNET_NETWORK_socket_setsockopt (s,
1750 TCP_STEALTH_INTEGRITY,
1751 &plugin->my_welcome,
1752 sizeof (struct WelcomeMessage))) )
1754 /* TCP STEALTH not supported by kernel */
1755 GNUNET_break (GNUNET_OK ==
1756 GNUNET_NETWORK_socket_close (s));
1761 sa = GNUNET_CONNECTION_connect_socket (s, sb, sbs);
1770 sa = GNUNET_CONNECTION_create_from_sockaddr (af, sb, sbs);
1774 LOG (GNUNET_ERROR_TYPE_DEBUG,
1775 "Failed to create connection to `%4s' at `%s'\n",
1776 GNUNET_i2s (&address->peer),
1777 GNUNET_a2s (sb, sbs));
1780 LOG (GNUNET_ERROR_TYPE_DEBUG,
1781 "Asked to transmit to `%4s', creating fresh session using address `%s'.\n",
1782 GNUNET_i2s (&address->peer),
1783 GNUNET_a2s (sb, sbs));
1785 session = create_session (plugin,
1788 GNUNET_SERVER_connect_socket (plugin->server,
1791 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
1794 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
1795 /* Send TCP Welcome */
1796 process_pending_messages (session);
1803 * We have been asked to destroy all connections to a particular peer.
1804 * This function is called on each applicable session and must tear it
1807 * @param cls the `struct Plugin *`
1808 * @param key the peer which the session belongs to (unused)
1809 * @param value the `struct GNUNET_ATS_Session`
1810 * @return #GNUNET_YES (continue to iterate)
1813 session_disconnect_it (void *cls,
1814 const struct GNUNET_PeerIdentity *key,
1817 struct Plugin *plugin = cls;
1818 struct GNUNET_ATS_Session *session = value;
1820 GNUNET_STATISTICS_update (session->plugin->env->stats,
1821 gettext_noop ("# transport-service disconnect requests for TCP"),
1824 tcp_plugin_disconnect_session (plugin,
1831 * Function that can be called to force a disconnect from the
1832 * specified neighbour. This should also cancel all previously
1833 * scheduled transmissions. Obviously the transmission may have been
1834 * partially completed already, which is OK. The plugin is supposed
1835 * to close the connection (if applicable) and no longer call the
1836 * transmit continuation(s).
1838 * Finally, plugin MUST NOT call the services's receive function to
1839 * notify the service that the connection to the specified target was
1840 * closed after a getting this call.
1842 * @param cls closure
1843 * @param target peer for which the last transmission is
1847 tcp_plugin_disconnect (void *cls,
1848 const struct GNUNET_PeerIdentity *target)
1850 struct Plugin *plugin = cls;
1852 LOG (GNUNET_ERROR_TYPE_DEBUG,
1853 "Disconnecting peer `%4s'\n",
1854 GNUNET_i2s (target));
1855 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessionmap,
1857 &session_disconnect_it,
1859 GNUNET_CONTAINER_multipeermap_get_multiple (plugin->nat_wait_conns,
1861 &session_disconnect_it,
1867 * We are processing an address pretty printing request and finished
1868 * the IP resolution (if applicable). Append our port and forward the
1869 * result. If called with @a hostname NULL, we are done and should
1870 * clean up the pretty printer (otherwise, there might be multiple
1871 * hostnames for the IP address and we might receive more).
1873 * @param cls the `struct PrettyPrinterContext *`
1874 * @param hostname hostname part of the address
1877 append_port (void *cls,
1878 const char *hostname)
1880 struct PrettyPrinterContext *ppc = cls;
1881 struct Plugin *plugin = ppc->plugin;
1884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1885 "append_port called with hostname `%s'\n",
1887 if (NULL == hostname)
1889 /* Final call, done */
1890 ppc->resolver_handle = NULL;
1891 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
1892 plugin->ppc_dll_tail,
1894 ppc->asc (ppc->asc_cls,
1900 if (GNUNET_YES == ppc->ipv6)
1901 GNUNET_asprintf (&ret,
1908 GNUNET_asprintf (&ret,
1914 ppc->asc (ppc->asc_cls,
1922 * Convert the transports address to a nice, human-readable format.
1924 * @param cls closure with the `struct Plugin`
1925 * @param type name of the transport that generated the address
1926 * @param addr one of the addresses of the host, NULL for the last address
1927 * the specific address format depends on the transport
1928 * @param addrlen length of the @a addr
1929 * @param numeric should (IP) addresses be displayed in numeric form?
1930 * @param timeout after how long should we give up?
1931 * @param asc function to call on each string
1932 * @param asc_cls closure for @a asc
1935 tcp_plugin_address_pretty_printer (void *cls,
1940 struct GNUNET_TIME_Relative timeout,
1941 GNUNET_TRANSPORT_AddressStringCallback asc,
1944 struct Plugin *plugin = cls;
1945 struct PrettyPrinterContext *ppc;
1948 struct sockaddr_in a4;
1949 struct sockaddr_in6 a6;
1950 const struct IPv4TcpAddress *t4;
1951 const struct IPv6TcpAddress *t6;
1955 if (sizeof(struct IPv6TcpAddress) == addrlen)
1958 memset (&a6, 0, sizeof(a6));
1959 a6.sin6_family = AF_INET6;
1960 a6.sin6_port = t6->t6_port;
1961 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
1962 port = ntohs (t6->t6_port);
1963 options = ntohl (t6->options);
1967 else if (sizeof(struct IPv4TcpAddress) == addrlen)
1970 memset (&a4, 0, sizeof(a4));
1971 a4.sin_family = AF_INET;
1972 a4.sin_port = t4->t4_port;
1973 a4.sin_addr.s_addr = t4->ipv4_addr;
1974 port = ntohs (t4->t4_port);
1975 options = ntohl (t4->options);
1981 /* invalid address */
1982 LOG (GNUNET_ERROR_TYPE_WARNING,
1983 _("Unexpected address length: %u bytes\n"),
1984 (unsigned int) addrlen);
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 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2000 "Starting DNS reverse lookup\n");
2001 ppc->resolver_handle = GNUNET_RESOLVER_hostname_get (sb,
2006 if (NULL == ppc->resolver_handle)
2012 GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
2013 plugin->ppc_dll_tail,
2019 * Check if the given port is plausible (must be either our listen
2020 * port or our advertised port), or any port if we are behind NAT
2021 * and do not have a port open. If it is neither, we return
2024 * @param plugin global variables
2025 * @param in_port port number to check
2026 * @return #GNUNET_OK if port is either open_port or adv_port
2029 check_port (struct Plugin *plugin,
2032 if ( (in_port == plugin->adv_port) ||
2033 (in_port == plugin->open_port) )
2035 return GNUNET_SYSERR;
2040 * Function that will be called to check if a binary address for this
2041 * plugin is well-formed and corresponds to an address for THIS peer
2042 * (as per our configuration). Naturally, if absolutely necessary,
2043 * plugins can be a bit conservative in their answer, but in general
2044 * plugins should make sure that the address does not redirect
2045 * traffic to a 3rd party that might try to man-in-the-middle our
2048 * @param cls closure, our `struct Plugin *`
2049 * @param addr pointer to the address
2050 * @param addrlen length of @a addr
2051 * @return #GNUNET_OK if this is a plausible address for this peer
2052 * and transport, #GNUNET_SYSERR if not
2055 tcp_plugin_check_address (void *cls,
2059 struct Plugin *plugin = cls;
2060 const struct IPv4TcpAddress *v4;
2061 const struct IPv6TcpAddress *v6;
2063 if ( (addrlen != sizeof(struct IPv4TcpAddress)) &&
2064 (addrlen != sizeof(struct IPv6TcpAddress)) )
2066 GNUNET_break_op (0);
2067 return GNUNET_SYSERR;
2070 if (addrlen == sizeof(struct IPv4TcpAddress))
2072 v4 = (const struct IPv4TcpAddress *) addr;
2073 if (0 != memcmp (&v4->options,
2078 return GNUNET_SYSERR;
2080 if (GNUNET_OK != check_port (plugin,
2081 ntohs (v4->t4_port)))
2082 return GNUNET_SYSERR;
2084 GNUNET_NAT_test_address (plugin->nat,
2086 sizeof (struct in_addr)))
2087 return GNUNET_SYSERR;
2091 v6 = (const struct IPv6TcpAddress *) addr;
2092 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
2094 GNUNET_break_op (0);
2095 return GNUNET_SYSERR;
2097 if (0 != memcmp (&v6->options,
2102 return GNUNET_SYSERR;
2104 if (GNUNET_OK != check_port (plugin,
2105 ntohs (v6->t6_port)))
2106 return GNUNET_SYSERR;
2108 GNUNET_NAT_test_address (plugin->nat,
2110 sizeof(struct in6_addr)))
2111 return GNUNET_SYSERR;
2118 * We've received a nat probe from this peer via TCP. Finish
2119 * creating the client session and resume sending of queued
2122 * @param cls closure
2123 * @param client identification of the client
2124 * @param message the actual message
2127 handle_tcp_nat_probe (void *cls,
2128 struct GNUNET_SERVER_Client *client,
2129 const struct GNUNET_MessageHeader *message)
2131 struct Plugin *plugin = cls;
2132 struct GNUNET_ATS_Session *session;
2133 const struct TCP_NAT_ProbeMessage *tcp_nat_probe;
2136 struct IPv4TcpAddress *t4;
2137 struct IPv6TcpAddress *t6;
2138 const struct sockaddr_in *s4;
2139 const struct sockaddr_in6 *s6;
2141 LOG (GNUNET_ERROR_TYPE_DEBUG,
2142 "Received NAT probe\n");
2143 /* We have received a TCP NAT probe, meaning we (hopefully) initiated
2144 * a connection to this peer by running gnunet-nat-client. This peer
2145 * received the punch message and now wants us to use the new connection
2146 * as the default for that peer. Do so and then send a WELCOME message
2147 * so we can really be connected!
2149 if (ntohs (message->size) != sizeof(struct TCP_NAT_ProbeMessage))
2152 GNUNET_SERVER_receive_done (client,
2157 tcp_nat_probe = (const struct TCP_NAT_ProbeMessage *) message;
2158 if (0 == memcmp (&tcp_nat_probe->clientIdentity, plugin->env->my_identity,
2159 sizeof(struct GNUNET_PeerIdentity)))
2161 /* refuse connections from ourselves */
2162 GNUNET_SERVER_receive_done (client,
2167 session = GNUNET_CONTAINER_multipeermap_get (plugin->nat_wait_conns,
2168 &tcp_nat_probe->clientIdentity);
2169 if (NULL == session)
2171 LOG (GNUNET_ERROR_TYPE_DEBUG,
2172 "Did NOT find session for NAT probe!\n");
2173 GNUNET_SERVER_receive_done (client,
2177 LOG (GNUNET_ERROR_TYPE_DEBUG,
2178 "Found session for NAT probe!\n");
2180 if (NULL != session->nat_connection_timeout)
2182 GNUNET_SCHEDULER_cancel (session->nat_connection_timeout);
2183 session->nat_connection_timeout = NULL;
2187 GNUNET_SERVER_client_get_address (client,
2192 GNUNET_SERVER_receive_done (client,
2194 tcp_plugin_disconnect_session (plugin,
2198 GNUNET_assert (GNUNET_YES ==
2199 GNUNET_CONTAINER_multipeermap_remove (plugin->nat_wait_conns,
2200 &tcp_nat_probe->clientIdentity,
2202 GNUNET_SERVER_client_set_user_context (client,
2204 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2207 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2208 session->last_activity = GNUNET_TIME_absolute_get ();
2209 LOG (GNUNET_ERROR_TYPE_DEBUG,
2210 "Found address `%s' for incoming connection\n",
2211 GNUNET_a2s (vaddr, alen));
2212 switch (((const struct sockaddr *) vaddr)->sa_family)
2216 t4 = GNUNET_new (struct IPv4TcpAddress);
2217 t4->options = htonl (TCP_OPTIONS_NONE);
2218 t4->t4_port = s4->sin_port;
2219 t4->ipv4_addr = s4->sin_addr.s_addr;
2220 session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
2223 sizeof(struct IPv4TcpAddress),
2224 GNUNET_HELLO_ADDRESS_INFO_NONE);
2228 t6 = GNUNET_new (struct IPv6TcpAddress);
2229 t6->options = htonl (TCP_OPTIONS_NONE);
2230 t6->t6_port = s6->sin6_port;
2231 memcpy (&t6->ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2232 session->address = GNUNET_HELLO_address_allocate (&tcp_nat_probe->clientIdentity,
2235 sizeof(struct IPv6TcpAddress),
2236 GNUNET_HELLO_ADDRESS_INFO_NONE);
2240 LOG(GNUNET_ERROR_TYPE_DEBUG,
2241 "Bad address for incoming connection!\n");
2243 GNUNET_SERVER_receive_done (client,
2245 tcp_plugin_disconnect_session (plugin,
2249 GNUNET_free (vaddr);
2250 GNUNET_break (NULL == session->client);
2251 session->client = client;
2252 GNUNET_STATISTICS_update (plugin->env->stats,
2253 gettext_noop ("# TCP sessions active"),
2256 process_pending_messages (session);
2257 GNUNET_SERVER_receive_done (client,
2263 * We've received a welcome from this peer via TCP. Possibly create a
2264 * fresh client record and send back our welcome.
2266 * @param cls closure
2267 * @param client identification of the client
2268 * @param message the actual message
2271 handle_tcp_welcome (void *cls,
2272 struct GNUNET_SERVER_Client *client,
2273 const struct GNUNET_MessageHeader *message)
2275 struct Plugin *plugin = cls;
2276 const struct WelcomeMessage *wm = (const struct WelcomeMessage *) message;
2277 struct GNUNET_HELLO_Address *address;
2278 struct GNUNET_ATS_Session *session;
2281 struct IPv4TcpAddress t4;
2282 struct IPv6TcpAddress t6;
2283 const struct sockaddr_in *s4;
2284 const struct sockaddr_in6 *s6;
2286 if (0 == memcmp (&wm->clientIdentity,
2287 plugin->env->my_identity,
2288 sizeof(struct GNUNET_PeerIdentity)))
2290 /* refuse connections from ourselves */
2291 GNUNET_SERVER_receive_done (client,
2294 GNUNET_SERVER_client_get_address (client,
2298 LOG (GNUNET_ERROR_TYPE_INFO,
2299 "Received WELCOME message from my own identity `%4s' on address `%s'\n",
2300 GNUNET_i2s (&wm->clientIdentity),
2301 GNUNET_a2s (vaddr, alen));
2307 LOG(GNUNET_ERROR_TYPE_DEBUG,
2308 "Received WELCOME message from `%4s' %p\n",
2309 GNUNET_i2s (&wm->clientIdentity),
2311 GNUNET_STATISTICS_update (plugin->env->stats,
2312 gettext_noop ("# TCP WELCOME messages received"),
2315 session = lookup_session_by_client (plugin, client);
2316 if (NULL != session)
2319 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2321 LOG (GNUNET_ERROR_TYPE_DEBUG,
2322 "Found existing session %p for peer `%s'\n",
2324 GNUNET_a2s (vaddr, alen));
2325 GNUNET_free (vaddr);
2331 GNUNET_SERVER_client_get_address (client, &vaddr, &alen))
2333 if (alen == sizeof(struct sockaddr_in))
2336 memset (&t4, '\0', sizeof (t4));
2337 t4.options = htonl (TCP_OPTIONS_NONE);
2338 t4.t4_port = s4->sin_port;
2339 t4.ipv4_addr = s4->sin_addr.s_addr;
2340 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2344 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2346 else if (alen == sizeof(struct sockaddr_in6))
2349 memset (&t6, '\0', sizeof (t6));
2350 t6.options = htonl (TCP_OPTIONS_NONE);
2351 t6.t6_port = s6->sin6_port;
2352 memcpy (&t6.ipv6_addr, &s6->sin6_addr, sizeof(struct in6_addr));
2353 address = GNUNET_HELLO_address_allocate (&wm->clientIdentity,
2357 GNUNET_HELLO_ADDRESS_INFO_INBOUND);
2362 GNUNET_free_non_null (vaddr);
2363 GNUNET_SERVER_receive_done (client,
2367 session = create_session (plugin,
2369 plugin->env->get_address_type (plugin->env->cls,
2374 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != session->scope);
2375 GNUNET_HELLO_address_free (address);
2376 LOG (GNUNET_ERROR_TYPE_DEBUG,
2377 "Creating new%s session %p for peer `%s' client %p\n",
2378 GNUNET_HELLO_address_check_option (session->address,
2379 GNUNET_HELLO_ADDRESS_INFO_INBOUND)
2382 tcp_plugin_address_to_string (plugin,
2383 session->address->address,
2384 session->address->address_length),
2386 GNUNET_free (vaddr);
2387 (void) GNUNET_CONTAINER_multipeermap_put (plugin->sessionmap,
2390 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2391 /* Notify transport and ATS about new session */
2392 plugin->env->session_start (plugin->env->cls,
2399 LOG(GNUNET_ERROR_TYPE_DEBUG,
2400 "Did not obtain TCP socket address for incoming connection\n");
2402 GNUNET_SERVER_receive_done (client,
2408 if (session->expecting_welcome != GNUNET_YES)
2411 GNUNET_SERVER_receive_done (client,
2416 session->last_activity = GNUNET_TIME_absolute_get ();
2417 session->expecting_welcome = GNUNET_NO;
2419 process_pending_messages (session);
2420 GNUNET_SERVER_client_set_timeout (client,
2421 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2422 GNUNET_SERVER_receive_done (client,
2428 * We've received data for this peer via TCP. Unbox,
2429 * compute latency and forward.
2431 * @param cls closure
2432 * @param client identification of the client
2433 * @param message the actual message
2436 handle_tcp_data (void *cls,
2437 struct GNUNET_SERVER_Client *client,
2438 const struct GNUNET_MessageHeader *message)
2440 struct Plugin *plugin = cls;
2441 struct GNUNET_ATS_Session *session;
2442 struct GNUNET_TIME_Relative delay;
2445 type = ntohs (message->type);
2446 if ( (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME == type) ||
2447 (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE == type) )
2449 /* We don't want to propagate WELCOME and NAT Probe messages up! */
2450 GNUNET_SERVER_receive_done (client,
2454 session = lookup_session_by_client (plugin, client);
2455 if (NULL == session)
2457 /* No inbound session found */
2461 GNUNET_SERVER_client_get_address (client,
2464 LOG (GNUNET_ERROR_TYPE_ERROR,
2465 "Received unexpected %u bytes of type %u from `%s'\n",
2466 (unsigned int) ntohs (message->size),
2467 (unsigned int) ntohs (message->type),
2471 GNUNET_SERVER_receive_done (client,
2473 GNUNET_free_non_null (vaddr);
2476 if (GNUNET_YES == session->expecting_welcome)
2478 /* Session is expecting WELCOME message */
2482 GNUNET_SERVER_client_get_address (client, &vaddr, &alen);
2483 LOG (GNUNET_ERROR_TYPE_ERROR,
2484 "Received unexpected %u bytes of type %u from `%s'\n",
2485 (unsigned int) ntohs (message->size),
2486 (unsigned int) ntohs (message->type),
2487 GNUNET_a2s (vaddr, alen));
2489 GNUNET_SERVER_receive_done (client,
2491 GNUNET_free_non_null (vaddr);
2495 session->last_activity = GNUNET_TIME_absolute_get ();
2496 LOG (GNUNET_ERROR_TYPE_DEBUG,
2497 "Passing %u bytes of type %u from `%4s' to transport service.\n",
2498 (unsigned int) ntohs (message->size),
2499 (unsigned int) ntohs (message->type),
2500 GNUNET_i2s (&session->target));
2502 GNUNET_STATISTICS_update (plugin->env->stats,
2503 gettext_noop ("# bytes received via TCP"),
2504 ntohs (message->size),
2507 GNUNET_assert (GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessionmap,
2510 delay = plugin->env->receive (plugin->env->cls,
2514 reschedule_session_timeout (session);
2515 if (0 == delay.rel_value_us)
2517 GNUNET_SERVER_receive_done (client,
2522 LOG (GNUNET_ERROR_TYPE_DEBUG,
2523 "Throttling receiving from `%s' for %s\n",
2524 GNUNET_i2s (&session->target),
2525 GNUNET_STRINGS_relative_time_to_string (delay,
2527 GNUNET_SERVER_disable_receive_done_warning (client);
2528 GNUNET_assert (NULL == session->receive_delay_task);
2529 session->receive_delay_task = GNUNET_SCHEDULER_add_delayed (delay,
2537 * Function called whenever a peer is connected on the "SERVER" level.
2538 * Increments number of active connections and suspends server if we
2539 * have reached the limit.
2541 * @param cls closure
2542 * @param client identification of the client
2545 connect_notify (void *cls,
2546 struct GNUNET_SERVER_Client *client)
2548 struct Plugin *plugin = cls;
2552 plugin->cur_connections++;
2553 GNUNET_STATISTICS_set (plugin->env->stats,
2554 gettext_noop ("# TCP server connections active"),
2555 plugin->cur_connections,
2557 GNUNET_STATISTICS_update (plugin->env->stats,
2558 gettext_noop ("# TCP server connect events"),
2561 if (plugin->cur_connections != plugin->max_connections)
2563 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2564 _("TCP connection limit reached, suspending server\n"));
2565 GNUNET_STATISTICS_update (plugin->env->stats,
2566 gettext_noop ("# TCP service suspended"),
2569 GNUNET_SERVER_suspend (plugin->server); /* Maximum number of connections rechead */
2574 * Function called whenever a peer is disconnected on the "SERVER"
2575 * level. Cleans up the connection, decrements number of active
2576 * connections and if applicable resumes listening.
2578 * @param cls closure
2579 * @param client identification of the client
2582 disconnect_notify (void *cls,
2583 struct GNUNET_SERVER_Client *client)
2585 struct Plugin *plugin = cls;
2586 struct GNUNET_ATS_Session *session;
2590 GNUNET_assert (plugin->cur_connections >= 1);
2591 plugin->cur_connections--;
2592 session = lookup_session_by_client (plugin,
2594 if (NULL == session)
2595 return; /* unknown, nothing to do */
2596 LOG (GNUNET_ERROR_TYPE_DEBUG,
2597 "Destroying session of `%4s' with %s due to network-level disconnect.\n",
2598 GNUNET_i2s (&session->target),
2599 tcp_plugin_address_to_string (session->plugin,
2600 session->address->address,
2601 session->address->address_length));
2603 if (plugin->cur_connections == plugin->max_connections)
2605 GNUNET_STATISTICS_update (session->plugin->env->stats,
2606 gettext_noop ("# TCP service resumed"),
2609 GNUNET_SERVER_resume (plugin->server); /* Resume server */
2611 GNUNET_STATISTICS_set (plugin->env->stats,
2612 gettext_noop ("# TCP server connections active"),
2613 plugin->cur_connections,
2615 GNUNET_STATISTICS_update (session->plugin->env->stats,
2616 gettext_noop ("# network-level TCP disconnect events"),
2619 tcp_plugin_disconnect_session (plugin,
2625 * We can now send a probe message, copy into buffer to really send.
2627 * @param cls closure, a `struct TCPProbeContext`
2628 * @param size max size to copy
2629 * @param buf buffer to copy message to
2630 * @return number of bytes copied into @a buf
2633 notify_send_probe (void *cls,
2637 struct TCPProbeContext *tcp_probe_ctx = cls;
2638 struct Plugin *plugin = tcp_probe_ctx->plugin;
2641 tcp_probe_ctx->transmit_handle = NULL;
2642 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
2647 GNUNET_CONNECTION_destroy (tcp_probe_ctx->sock);
2648 GNUNET_free(tcp_probe_ctx);
2651 GNUNET_assert(size >= sizeof(tcp_probe_ctx->message));
2653 &tcp_probe_ctx->message,
2654 sizeof(tcp_probe_ctx->message));
2655 GNUNET_SERVER_connect_socket (tcp_probe_ctx->plugin->server,
2656 tcp_probe_ctx->sock);
2657 ret = sizeof(tcp_probe_ctx->message);
2658 GNUNET_free (tcp_probe_ctx);
2664 * Function called by the NAT subsystem suggesting another peer wants
2665 * to connect to us via connection reversal. Try to connect back to the
2668 * @param cls closure
2669 * @param addr address to try
2670 * @param addrlen number of bytes in @a addr
2673 try_connection_reversal (void *cls,
2674 const struct sockaddr *addr,
2677 struct Plugin *plugin = cls;
2678 struct GNUNET_CONNECTION_Handle *sock;
2679 struct TCPProbeContext *tcp_probe_ctx;
2682 * We have received an ICMP response, ostensibly from a peer
2683 * that wants to connect to us! Send a message to establish a connection.
2685 sock = GNUNET_CONNECTION_create_from_sockaddr (AF_INET,
2690 /* failed for some odd reason (out of sockets?); ignore attempt */
2694 tcp_probe_ctx = GNUNET_new (struct TCPProbeContext);
2695 tcp_probe_ctx->message.header.size
2696 = htons (sizeof (struct TCP_NAT_ProbeMessage));
2697 tcp_probe_ctx->message.header.type
2698 = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE);
2699 tcp_probe_ctx->message.clientIdentity
2700 = *plugin->env->my_identity;
2701 tcp_probe_ctx->plugin = plugin;
2702 tcp_probe_ctx->sock = sock;
2703 GNUNET_CONTAINER_DLL_insert (plugin->probe_head,
2706 tcp_probe_ctx->transmit_handle
2707 = GNUNET_CONNECTION_notify_transmit_ready (sock,
2708 ntohs (tcp_probe_ctx->message.header.size),
2709 GNUNET_TIME_UNIT_FOREVER_REL,
2716 * Function obtain the network type for a session
2718 * @param cls closure (`struct Plugin *`)
2719 * @param session the session
2720 * @return the network type in HBO or #GNUNET_SYSERR
2722 static enum GNUNET_ATS_Network_Type
2723 tcp_plugin_get_network (void *cls,
2724 struct GNUNET_ATS_Session *session)
2726 return session->scope;
2731 * Function obtain the network type for an address.
2733 * @param cls closure (`struct Plugin *`)
2734 * @param address the address
2735 * @return the network type
2737 static enum GNUNET_ATS_Network_Type
2738 tcp_plugin_get_network_for_address (void *cls,
2739 const struct GNUNET_HELLO_Address *address)
2741 struct Plugin *plugin = cls;
2743 struct sockaddr_in a4;
2744 struct sockaddr_in6 a6;
2745 const struct IPv4TcpAddress *t4;
2746 const struct IPv6TcpAddress *t6;
2750 addrlen = address->address_length;
2751 if (addrlen == sizeof(struct IPv6TcpAddress))
2753 GNUNET_assert (NULL != address->address); /* make static analysis happy */
2754 t6 = address->address;
2755 memset (&a6, 0, sizeof(a6));
2756 #if HAVE_SOCKADDR_IN_SIN_LEN
2757 a6.sin6_len = sizeof (a6);
2759 a6.sin6_family = AF_INET6;
2760 a6.sin6_port = t6->t6_port;
2761 memcpy (&a6.sin6_addr, &t6->ipv6_addr, sizeof(struct in6_addr));
2765 else if (addrlen == sizeof(struct IPv4TcpAddress))
2767 GNUNET_assert (NULL != address->address); /* make static analysis happy */
2768 t4 = address->address;
2769 memset (&a4, 0, sizeof(a4));
2770 #if HAVE_SOCKADDR_IN_SIN_LEN
2771 a4.sin_len = sizeof (a4);
2773 a4.sin_family = AF_INET;
2774 a4.sin_port = t4->t4_port;
2775 a4.sin_addr.s_addr = t4->ipv4_addr;
2782 return GNUNET_ATS_NET_UNSPECIFIED;
2784 return plugin->env->get_address_type (plugin->env->cls,
2791 * Return information about the given session to the
2794 * @param cls the `struct Plugin` with the monitor callback (`sic`)
2795 * @param peer peer we send information about
2796 * @param value our `struct GNUNET_ATS_Session` to send information about
2797 * @return #GNUNET_OK (continue to iterate)
2800 send_session_info_iter (void *cls,
2801 const struct GNUNET_PeerIdentity *peer,
2804 struct Plugin *plugin = cls;
2805 struct GNUNET_ATS_Session *session = value;
2807 notify_session_monitor (plugin,
2809 GNUNET_TRANSPORT_SS_INIT);
2810 /* FIXME: cannot tell if this is up or not from current
2812 notify_session_monitor (plugin,
2814 GNUNET_TRANSPORT_SS_UP);
2820 * Begin monitoring sessions of a plugin. There can only
2821 * be one active monitor per plugin (i.e. if there are
2822 * multiple monitors, the transport service needs to
2823 * multiplex the generated events over all of them).
2825 * @param cls closure of the plugin
2826 * @param sic callback to invoke, NULL to disable monitor;
2827 * plugin will being by iterating over all active
2828 * sessions immediately and then enter monitor mode
2829 * @param sic_cls closure for @a sic
2832 tcp_plugin_setup_monitor (void *cls,
2833 GNUNET_TRANSPORT_SessionInfoCallback sic,
2836 struct Plugin *plugin = cls;
2839 plugin->sic_cls = sic_cls;
2842 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
2843 &send_session_info_iter,
2845 /* signal end of first iteration */
2846 sic (sic_cls, NULL, NULL);
2852 * Entry point for the plugin.
2854 * @param cls closure, the `struct GNUNET_TRANSPORT_PluginEnvironment *`
2855 * @return the `struct GNUNET_TRANSPORT_PluginFunctions *` or NULL on error
2858 libgnunet_plugin_transport_tcp_init (void *cls)
2860 static const struct GNUNET_SERVER_MessageHandler my_handlers[] = {
2861 { &handle_tcp_welcome, NULL,
2862 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME,
2863 sizeof(struct WelcomeMessage) },
2864 { &handle_tcp_nat_probe, NULL,
2865 GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_NAT_PROBE,
2866 sizeof(struct TCP_NAT_ProbeMessage) },
2867 { &handle_tcp_data, NULL,
2868 GNUNET_MESSAGE_TYPE_ALL, 0 },
2869 { NULL, NULL, 0, 0 }
2871 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
2872 struct GNUNET_TRANSPORT_PluginFunctions *api;
2873 struct Plugin *plugin;
2874 struct GNUNET_SERVICE_Context *service;
2875 unsigned long long aport;
2876 unsigned long long bport;
2877 unsigned long long max_connections;
2879 struct GNUNET_TIME_Relative idle_timeout;
2881 struct GNUNET_NETWORK_Handle *const*lsocks;
2885 struct sockaddr **addrs;
2886 socklen_t *addrlens;
2888 if (NULL == env->receive)
2890 /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
2891 initialze the plugin or the API */
2892 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
2894 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
2895 api->address_to_string = &tcp_plugin_address_to_string;
2896 api->string_to_address = &tcp_plugin_string_to_address;
2900 GNUNET_assert (NULL != env->cfg);
2902 GNUNET_CONFIGURATION_get_value_number (env->cfg,
2906 max_connections = 128;
2910 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2914 GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-tcp",
2915 "ADVERTISED-PORT", &aport)) &&
2918 LOG(GNUNET_ERROR_TYPE_ERROR,
2919 _("Require valid port number for service `%s' in configuration!\n"),
2929 service = GNUNET_SERVICE_start ("transport-tcp",
2931 GNUNET_SERVICE_OPTION_NONE);
2932 if (NULL == service)
2934 LOG (GNUNET_ERROR_TYPE_WARNING,
2935 _("Failed to start service.\n"));
2943 plugin = GNUNET_new (struct Plugin);
2944 plugin->sessionmap = GNUNET_CONTAINER_multipeermap_create (max_connections,
2946 plugin->max_connections = max_connections;
2947 plugin->open_port = bport;
2948 plugin->adv_port = aport;
2950 plugin->my_welcome.header.size = htons (sizeof(struct WelcomeMessage));
2951 plugin->my_welcome.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TCP_WELCOME);
2952 plugin->my_welcome.clientIdentity = *plugin->env->my_identity;
2954 if ( (NULL != service) &&
2956 GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
2961 plugin->myoptions |= TCP_OPTIONS_TCP_STEALTH;
2962 lsocks = GNUNET_SERVICE_get_listen_sockets (service);
2965 uint32_t len = sizeof (struct WelcomeMessage);
2967 for (i=0;NULL!=lsocks[i];i++)
2970 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2974 sizeof (struct GNUNET_PeerIdentity))) ||
2976 GNUNET_NETWORK_socket_setsockopt (lsocks[i],
2978 TCP_STEALTH_INTEGRITY_LEN,
2982 /* TCP STEALTH not supported by kernel */
2983 GNUNET_assert (0 == i);
2984 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2985 _("TCP_STEALTH not supported on this platform.\n"));
2991 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2992 _("TCP_STEALTH not supported on this platform.\n"));
2997 if ( (NULL != service) &&
3000 GNUNET_SERVICE_get_server_addresses ("transport-tcp",
3005 for (ret = ret_s-1; ret >= 0; ret--)
3006 LOG (GNUNET_ERROR_TYPE_INFO,
3007 "Binding to address `%s'\n",
3008 GNUNET_a2s (addrs[ret], addrlens[ret]));
3010 = GNUNET_NAT_register (env->cfg,
3013 (unsigned int) ret_s,
3014 (const struct sockaddr **) addrs, addrlens,
3015 &tcp_nat_port_map_callback,
3016 &try_connection_reversal,
3018 for (ret = ret_s -1; ret >= 0; ret--)
3019 GNUNET_free (addrs[ret]);
3020 GNUNET_free_non_null (addrs);
3021 GNUNET_free_non_null (addrlens);
3025 plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
3032 &try_connection_reversal,
3036 api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
3038 api->send = &tcp_plugin_send;
3039 api->get_session = &tcp_plugin_get_session;
3040 api->disconnect_session = &tcp_plugin_disconnect_session;
3041 api->query_keepalive_factor = &tcp_plugin_query_keepalive_factor;
3042 api->disconnect_peer = &tcp_plugin_disconnect;
3043 api->address_pretty_printer = &tcp_plugin_address_pretty_printer;
3044 api->check_address = &tcp_plugin_check_address;
3045 api->address_to_string = &tcp_plugin_address_to_string;
3046 api->string_to_address = &tcp_plugin_string_to_address;
3047 api->get_network = &tcp_plugin_get_network;
3048 api->get_network_for_address = &tcp_plugin_get_network_for_address;
3049 api->update_session_timeout = &tcp_plugin_update_session_timeout;
3050 api->update_inbound_delay = &tcp_plugin_update_inbound_delay;
3051 api->setup_monitor = &tcp_plugin_setup_monitor;
3052 plugin->service = service;
3053 if (NULL != service)
3055 plugin->server = GNUNET_SERVICE_get_server (service);
3060 GNUNET_CONFIGURATION_get_value_time (env->cfg,
3065 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
3071 = GNUNET_SERVER_create_with_sockets (NULL,
3077 plugin->handlers = GNUNET_malloc (sizeof (my_handlers));
3078 memcpy (plugin->handlers, my_handlers, sizeof(my_handlers));
3079 for (i = 0;i < sizeof(my_handlers) / sizeof(struct GNUNET_SERVER_MessageHandler);i++)
3080 plugin->handlers[i].callback_cls = plugin;
3082 GNUNET_SERVER_add_handlers (plugin->server,
3084 GNUNET_SERVER_connect_notify (plugin->server,
3087 GNUNET_SERVER_disconnect_notify (plugin->server,
3090 plugin->nat_wait_conns = GNUNET_CONTAINER_multipeermap_create (16,
3093 LOG (GNUNET_ERROR_TYPE_INFO,
3094 _("TCP transport listening on port %llu\n"),
3097 LOG (GNUNET_ERROR_TYPE_INFO,
3098 _("TCP transport not listening on any port (client only)\n"));
3099 if ( (aport != bport) &&
3101 LOG (GNUNET_ERROR_TYPE_INFO,
3102 _("TCP transport advertises itself as being on port %llu\n"),
3104 /* Initially set connections to 0 */
3105 GNUNET_STATISTICS_set (plugin->env->stats,
3106 gettext_noop ("# TCP sessions active"),
3112 if (NULL != plugin->nat)
3113 GNUNET_NAT_unregister (plugin->nat);
3114 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3115 if (NULL != service)
3116 GNUNET_SERVICE_stop (service);
3117 GNUNET_free (plugin);
3118 GNUNET_free_non_null (api);
3124 * Exit point from the plugin.
3126 * @param cls the `struct GNUNET_TRANSPORT_PluginFunctions`
3130 libgnunet_plugin_transport_tcp_done (void *cls)
3132 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
3133 struct Plugin *plugin = api->cls;
3134 struct TCPProbeContext *tcp_probe;
3135 struct PrettyPrinterContext *cur;
3136 struct PrettyPrinterContext *next;
3143 LOG (GNUNET_ERROR_TYPE_DEBUG,
3144 "Shutting down TCP plugin\n");
3146 /* Removing leftover sessions */
3147 GNUNET_CONTAINER_multipeermap_iterate (plugin->sessionmap,
3148 &session_disconnect_it,
3150 /* Removing leftover NAT sessions */
3151 GNUNET_CONTAINER_multipeermap_iterate (plugin->nat_wait_conns,
3152 &session_disconnect_it,
3155 for (cur = plugin->ppc_dll_head; NULL != cur; cur = next)
3158 GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
3159 plugin->ppc_dll_tail,
3161 GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
3162 cur->asc (cur->asc_cls,
3168 if (NULL != plugin->service)
3169 GNUNET_SERVICE_stop (plugin->service);
3171 GNUNET_SERVER_destroy (plugin->server);
3172 GNUNET_free (plugin->handlers);
3173 if (NULL != plugin->nat)
3174 GNUNET_NAT_unregister (plugin->nat);
3175 while (NULL != (tcp_probe = plugin->probe_head))
3177 GNUNET_CONTAINER_DLL_remove (plugin->probe_head,
3180 GNUNET_CONNECTION_destroy (tcp_probe->sock);
3181 GNUNET_free (tcp_probe);
3183 GNUNET_CONTAINER_multipeermap_destroy (plugin->nat_wait_conns);
3184 GNUNET_CONTAINER_multipeermap_destroy (plugin->sessionmap);
3185 GNUNET_break (0 == plugin->cur_connections);
3186 GNUNET_free (plugin);
3191 /* end of plugin_transport_tcp.c */