2 This file is part of GNUnet.
3 (C) 2009 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 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
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.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
27 * - This code uses 'GNUNET_a2s' for debug printing in many places,
28 * which is technically wrong since it assumes we have IP+Port
29 * (v4/v6) addresses. Once we add transports like http or smtp
30 * this will have to be changed!
33 #include "gnunet_client_lib.h"
34 #include "gnunet_container_lib.h"
35 #include "gnunet_constants.h"
36 #include "gnunet_getopt_lib.h"
37 #include "gnunet_hello_lib.h"
38 #include "gnunet_os_lib.h"
39 #include "gnunet_peerinfo_service.h"
40 #include "gnunet_plugin_lib.h"
41 #include "gnunet_protocols.h"
42 #include "gnunet_service_lib.h"
43 #include "gnunet_signatures.h"
44 #include "plugin_transport.h"
45 #include "transport.h"
48 * Should we do some additional checks (to validate behavior
51 #define EXTRA_CHECKS GNUNET_YES
54 * How many messages can we have pending for a given client process
55 * before we start to drop incoming messages? We typically should
56 * have only one client and so this would be the primary buffer for
57 * messages, so the number should be chosen rather generously.
59 * The expectation here is that most of the time the queue is large
60 * enough so that a drop is virtually never required.
62 #define MAX_PENDING 128
65 * How often should we try to reconnect to a peer using a particular
66 * transport plugin before giving up? Note that the plugin may be
67 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
69 #define MAX_CONNECT_RETRY 3
72 * Limit on the number of ready-to-run tasks when validating
73 * HELLOs. If more tasks are ready to run, we will drop
74 * HELLOs instead of validating them.
76 #define MAX_HELLO_LOAD 4
79 * How often must a peer violate bandwidth quotas before we start
80 * to simply drop its messages?
82 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
85 * How long until a HELLO verification attempt should time out?
86 * Must be rather small, otherwise a partially successful HELLO
87 * validation (some addresses working) might not be available
88 * before a client's request for a connection fails for good.
89 * Besides, if a single request to an address takes a long time,
90 * then the peer is unlikely worthwhile anyway.
92 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
95 * Priority to use for PONG messages.
97 #define TRANSPORT_PONG_PRIORITY 4
100 * How often do we re-add (cheaper) plugins to our list of plugins
101 * to try for a given connected peer?
103 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
106 * After how long do we expire an address in a HELLO that we just
107 * validated? This value is also used for our own addresses when we
110 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
114 * How long before an existing address expires should we again try to
115 * validate it? Must be (significantly) smaller than
116 * HELLO_ADDRESS_EXPIRATION.
118 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
121 * Maximum frequency for re-evaluating latencies for all transport addresses.
123 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
126 * Maximum frequency for re-evaluating latencies for connected addresses.
128 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
132 * List of addresses of other peers
134 struct ForeignAddressList
137 * This is a linked list.
139 struct ForeignAddressList *next;
142 * Which ready list does this entry belong to.
144 struct ReadyList *ready_list;
147 * How long until we auto-expire this address (unless it is
148 * re-confirmed by the transport)?
150 struct GNUNET_TIME_Absolute expires;
153 * Task used to re-validate addresses, updates latencies and
156 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
169 * What was the last latency observed for this address, plugin and peer?
171 struct GNUNET_TIME_Relative latency;
174 * If we did not successfully transmit a message to the given peer
175 * via this connection during the specified time, we should consider
176 * the connection to be dead. This is used in the case that a TCP
177 * transport simply stalls writing to the stream but does not
178 * formerly get a signal that the other peer died.
180 struct GNUNET_TIME_Absolute timeout;
183 * How often have we tried to connect using this plugin? Used to
184 * discriminate against addresses that do not work well.
185 * FIXME: not yet used, but should be!
187 unsigned int connect_attempts;
190 * DV distance to this peer (1 if no DV is used).
191 * FIXME: need to set this from transport plugins!
196 * Have we ever estimated the latency of this address? Used to
197 * ensure that the first time we add an address, we immediately
203 * Are we currently connected via this address? The first time we
204 * successfully transmit or receive data to a peer via a particular
205 * address, we set this to GNUNET_YES. If we later get an error
206 * (disconnect notification, transmission failure, timeout), we set
207 * it back to GNUNET_NO.
212 * Is this plugin currently busy transmitting to the specific target?
213 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
214 * messages do not count as 'in transmit'.
219 * Has this address been validated yet?
227 * Entry in linked list of network addresses for ourselves.
229 struct OwnAddressList
232 * This is a linked list.
234 struct OwnAddressList *next;
237 * The address, actually a pointer to the end
238 * of this struct. Do not free!
243 * How long until we auto-expire this address (unless it is
244 * re-confirmed by the transport)?
246 struct GNUNET_TIME_Absolute expires;
257 * Entry in linked list of all of our plugins.
259 struct TransportPlugin
263 * This is a linked list.
265 struct TransportPlugin *next;
268 * API of the transport as returned by the plugin's
269 * initialization function.
271 struct GNUNET_TRANSPORT_PluginFunctions *api;
274 * Short name for the plugin (i.e. "tcp").
279 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
284 * List of our known addresses for this transport.
286 struct OwnAddressList *addresses;
289 * Environment this transport service is using
292 struct GNUNET_TRANSPORT_PluginEnvironment env;
295 * ID of task that is used to clean up expired addresses.
297 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
300 * Set to GNUNET_YES if we need to scrap the existing list of
301 * "addresses" and start fresh when we receive the next address
302 * update from a transport. Set to GNUNET_NO if we should just add
303 * the new address to the list and wait for the commit call.
309 struct NeighbourList;
312 * For each neighbour we keep a list of messages
313 * that we still want to transmit to the neighbour.
319 * This is a doubly linked list.
321 struct MessageQueue *next;
324 * This is a doubly linked list.
326 struct MessageQueue *prev;
329 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
330 * stuck together in memory. Allocated at the end of this struct.
332 const char *message_buf;
335 * Size of the message buf
337 size_t message_buf_size;
340 * Client responsible for queueing the message;
341 * used to check that a client has no two messages
342 * pending for the same target. Can be NULL.
344 struct TransportClient *client;
347 * Using which specific address should we send this message?
349 struct ForeignAddressList *specific_address;
352 * Peer ID of the Neighbour this entry belongs to.
354 struct GNUNET_PeerIdentity neighbour_id;
357 * Plugin that we used for the transmission.
358 * NULL until we scheduled a transmission.
360 struct TransportPlugin *plugin;
363 * At what time should we fail?
365 struct GNUNET_TIME_Absolute timeout;
368 * Internal message of the transport system that should not be
369 * included in the usual SEND-SEND_OK transmission confirmation
370 * traffic management scheme. Typically, "internal_msg" will
371 * be set whenever "client" is NULL (but it is not strictly
377 * How important is the message?
379 unsigned int priority;
385 * For a given Neighbour, which plugins are available
386 * to talk to this peer and what are their costs?
391 * This is a linked list.
393 struct ReadyList *next;
396 * Which of our transport plugins does this entry
399 struct TransportPlugin *plugin;
402 * Transport addresses, latency, and readiness for
403 * this particular plugin.
405 struct ForeignAddressList *addresses;
408 * To which neighbour does this ready list belong to?
410 struct NeighbourList *neighbour;
416 * Entry in linked list of all of our current neighbours.
422 * This is a linked list.
424 struct NeighbourList *next;
427 * Which of our transports is connected to this peer
428 * and what is their status?
430 struct ReadyList *plugins;
433 * Head of list of messages we would like to send to this peer;
434 * must contain at most one message per client.
436 struct MessageQueue *messages_head;
439 * Tail of list of messages we would like to send to this peer; must
440 * contain at most one message per client.
442 struct MessageQueue *messages_tail;
445 * Context for peerinfo iteration.
446 * NULL after we are done processing peerinfo's information.
448 struct GNUNET_PEERINFO_IteratorContext *piter;
451 * Public key for this peer. Valid only if the respective flag is set below.
453 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
456 * Identity of this neighbour.
458 struct GNUNET_PeerIdentity id;
461 * ID of task scheduled to run when this peer is about to
462 * time out (will free resources associated with the peer).
464 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
467 * ID of task scheduled to run when we should retry transmitting
468 * the head of the message queue. Actually triggered when the
469 * transmission is timing out (we trigger instantly when we have
470 * a chance of success).
472 GNUNET_SCHEDULER_TaskIdentifier retry_task;
475 * How long until we should consider this peer dead
476 * (if we don't receive another message in the
479 struct GNUNET_TIME_Absolute peer_timeout;
482 * Tracker for inbound bandwidth.
484 struct GNUNET_BANDWIDTH_Tracker in_tracker;
487 * The latency we have seen for this particular address for
488 * this particular peer. This latency may have been calculated
489 * over multiple transports. This value reflects how long it took
490 * us to receive a response when SENDING via this particular
491 * transport/neighbour/address combination!
493 * FIXME: we need to periodically send PINGs to update this
494 * latency (at least more often than the current "huge" (11h?)
497 struct GNUNET_TIME_Relative latency;
500 * How often has the other peer (recently) violated the
501 * inbound traffic limit? Incremented by 10 per violation,
502 * decremented by 1 per non-violation (for each
505 unsigned int quota_violation_count;
508 * DV distance to this peer (1 if no DV is used).
513 * Have we seen an PONG from this neighbour in the past (and
514 * not had a disconnect since)?
519 * Do we have a valid public key for this neighbour?
521 int public_key_valid;
526 * Message used to ask a peer to validate receipt (to check an address
529 struct TransportPingMessage
533 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
535 struct GNUNET_MessageHeader header;
538 * Random challenge number (in network byte order).
540 uint32_t challenge GNUNET_PACKED;
543 * Who is the intended recipient?
545 struct GNUNET_PeerIdentity target;
551 * Message used to validate a HELLO. The challenge is included in the
552 * confirmation to make matching of replies to requests possible. The
553 * signature signs the original challenge number, our public key, the
554 * sender's address (so that the sender can check that the address we
555 * saw is plausible for him and possibly detect a MiM attack) and a
556 * timestamp (to limit replay).<p>
558 * This message is followed by the address of the
559 * client that we are observing (which is part of what
562 struct TransportPongMessage
566 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
568 struct GNUNET_MessageHeader header;
571 * For padding, always zero.
573 uint32_t reserved GNUNET_PACKED;
578 struct GNUNET_CRYPTO_RsaSignature signature;
581 * What are we signing and why?
583 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
586 * Random challenge number (in network byte order).
588 uint32_t challenge GNUNET_PACKED;
591 * Who signed this message?
593 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
596 * Size of address appended to this message
604 * Linked list of messages to be transmitted to the client. Each
605 * entry is followed by the actual message.
607 struct ClientMessageQueueEntry
610 * This is a doubly-linked list.
612 struct ClientMessageQueueEntry *next;
615 * This is a doubly-linked list.
617 struct ClientMessageQueueEntry *prev;
622 * Client connected to the transport service.
624 struct TransportClient
628 * This is a linked list.
630 struct TransportClient *next;
633 * Handle to the client.
635 struct GNUNET_SERVER_Client *client;
638 * Linked list of messages yet to be transmitted to
641 struct ClientMessageQueueEntry *message_queue_head;
644 * Tail of linked list of messages yet to be transmitted to the
647 struct ClientMessageQueueEntry *message_queue_tail;
650 * Current transmit request handle.
652 struct GNUNET_CONNECTION_TransmitHandle *th;
655 * Is a call to "transmit_send_continuation" pending? If so, we
656 * must not free this struct (even if the corresponding client
657 * disconnects) and instead only remove it from the linked list and
658 * set the "client" field to NULL.
663 * Length of the list of messages pending for this client.
665 unsigned int message_count;
671 * Entry in map of all HELLOs awaiting validation.
673 struct ValidationEntry
677 * The address, actually a pointer to the end
678 * of this struct. Do not free!
683 * Name of the transport.
685 char *transport_name;
688 * The public key of the peer.
690 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
693 * ID of task that will clean up this entry if we don't succeed
694 * with the validation first.
696 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
699 * At what time did we send this validation?
701 struct GNUNET_TIME_Absolute send_time;
709 * Challenge number we used.
717 * Context of currently active requests to peerinfo
718 * for validation of HELLOs.
720 struct CheckHelloValidatedContext
724 * This is a doubly-linked list.
726 struct CheckHelloValidatedContext *next;
729 * This is a doubly-linked list.
731 struct CheckHelloValidatedContext *prev;
734 * Hello that we are validating.
736 const struct GNUNET_HELLO_Message *hello;
739 * Context for peerinfo iteration.
740 * NULL after we are done processing peerinfo's information.
742 struct GNUNET_PEERINFO_IteratorContext *piter;
745 * Was a HELLO known for this peer to peerinfo?
755 static struct GNUNET_HELLO_Message *our_hello;
758 * "version" of "our_hello". Used to see if a given neighbour has
759 * already been sent the latest version of our HELLO message.
761 static unsigned int our_hello_version;
766 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
771 static struct GNUNET_PeerIdentity my_identity;
776 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
781 struct GNUNET_SCHEDULER_Handle *sched;
786 const struct GNUNET_CONFIGURATION_Handle *cfg;
789 * Linked list of all clients to this service.
791 static struct TransportClient *clients;
794 * All loaded plugins.
796 static struct TransportPlugin *plugins;
801 static struct GNUNET_SERVER_Handle *server;
804 * All known neighbours and their HELLOs.
806 static struct NeighbourList *neighbours;
809 * Number of neighbours we'd like to have.
811 static uint32_t max_connect_per_transport;
814 * Head of linked list.
816 static struct CheckHelloValidatedContext *chvc_head;
819 * Tail of linked list.
821 static struct CheckHelloValidatedContext *chvc_tail;
824 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
825 * of the given peer that we are currently validating).
827 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
830 * Handle for reporting statistics.
832 static struct GNUNET_STATISTICS_Handle *stats;
836 * The peer specified by the given neighbour has timed-out or a plugin
837 * has disconnected. We may either need to do nothing (other plugins
838 * still up), or trigger a full disconnect and clean up. This
839 * function updates our state and do the necessary notifications.
840 * Also notifies our clients that the neighbour is now officially
843 * @param n the neighbour list entry for the peer
844 * @param check should we just check if all plugins
845 * disconnected or must we ask all plugins to
848 static void disconnect_neighbour (struct NeighbourList *n, int check);
851 * Check the ready list for the given neighbour and if a plugin is
852 * ready for transmission (and if we have a message), do so!
854 * @param neighbour target peer for which to transmit
856 static void try_transmission_to_peer (struct NeighbourList *neighbour);
860 * Find an entry in the neighbour list for a particular peer.
862 * @return NULL if not found.
864 static struct NeighbourList *
865 find_neighbour (const struct GNUNET_PeerIdentity *key)
867 struct NeighbourList *head = neighbours;
869 while ((head != NULL) &&
870 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
877 * Find an entry in the transport list for a particular transport.
879 * @return NULL if not found.
881 static struct TransportPlugin *
882 find_transport (const char *short_name)
884 struct TransportPlugin *head = plugins;
885 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
892 * Function called to notify a client about the socket being ready to
893 * queue more data. "buf" will be NULL and "size" zero if the socket
894 * was closed for writing in the meantime.
897 * @param size number of bytes available in buf
898 * @param buf where the callee should write the message
899 * @return number of bytes written to buf
902 transmit_to_client_callback (void *cls, size_t size, void *buf)
904 struct TransportClient *client = cls;
905 struct ClientMessageQueueEntry *q;
908 const struct GNUNET_MessageHeader *msg;
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 "Transmission to client failed, closing connection.\n");
916 /* fatal error with client, free message queue! */
917 while (NULL != (q = client->message_queue_head))
919 GNUNET_STATISTICS_update (stats,
920 gettext_noop ("# bytes discarded (could not transmit to client)"),
921 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
923 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
924 client->message_queue_tail,
928 client->message_count = 0;
933 while (NULL != (q = client->message_queue_head))
935 msg = (const struct GNUNET_MessageHeader *) &q[1];
936 msize = ntohs (msg->size);
937 if (msize + tsize > size)
940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
941 "Transmitting message of type %u to client.\n",
944 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
945 client->message_queue_tail,
947 memcpy (&cbuf[tsize], msg, msize);
950 client->message_count--;
954 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
955 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
957 GNUNET_TIME_UNIT_FOREVER_REL,
958 &transmit_to_client_callback,
960 GNUNET_assert (client->th != NULL);
967 * Send the specified message to the specified client. Since multiple
968 * messages may be pending for the same client at a time, this code
969 * makes sure that no message is lost.
971 * @param client client to transmit the message to
972 * @param msg the message to send
973 * @param may_drop can this message be dropped if the
974 * message queue for this client is getting far too large?
977 transmit_to_client (struct TransportClient *client,
978 const struct GNUNET_MessageHeader *msg, int may_drop)
980 struct ClientMessageQueueEntry *q;
983 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
985 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
987 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
988 client->message_count, MAX_PENDING);
989 /* TODO: call to statistics... */
992 msize = ntohs (msg->size);
993 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
994 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
995 memcpy (&q[1], msg, msize);
996 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
997 client->message_queue_tail,
998 client->message_queue_tail,
1000 client->message_count++;
1001 if (client->th == NULL)
1003 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1005 GNUNET_TIME_UNIT_FOREVER_REL,
1006 &transmit_to_client_callback,
1008 GNUNET_assert (client->th != NULL);
1014 * Transmit a 'SEND_OK' notification to the given client for the
1017 * @param client who to notify
1018 * @param n neighbour to notify about
1019 * @param result status code for the transmission request
1022 transmit_send_ok (struct TransportClient *client,
1023 struct NeighbourList *n,
1026 struct SendOkMessage send_ok_msg;
1028 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1029 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1030 send_ok_msg.success = htonl (result);
1031 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1032 send_ok_msg.peer = n->id;
1033 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1038 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1039 * upon "completion" of a send request. This tells the API
1040 * that it is now legal to send another message to the given
1043 * @param cls closure, identifies the entry on the
1044 * message queue that was transmitted and the
1045 * client responsible for queueing the message
1046 * @param target the peer receiving the message
1047 * @param result GNUNET_OK on success, if the transmission
1048 * failed, we should not tell the client to transmit
1052 transmit_send_continuation (void *cls,
1053 const struct GNUNET_PeerIdentity *target,
1056 struct MessageQueue *mq = cls;
1057 struct NeighbourList *n;
1059 GNUNET_STATISTICS_update (stats,
1060 gettext_noop ("# bytes pending with plugins"),
1061 - (int64_t) mq->message_buf_size,
1063 if (result == GNUNET_OK)
1065 GNUNET_STATISTICS_update (stats,
1066 gettext_noop ("# bytes successfully transmitted by plugins"),
1067 mq->message_buf_size,
1072 GNUNET_STATISTICS_update (stats,
1073 gettext_noop ("# bytes with transmission failure by plugins"),
1074 mq->message_buf_size,
1077 n = find_neighbour(&mq->neighbour_id);
1078 GNUNET_assert (n != NULL);
1079 if (mq->specific_address != NULL)
1081 if (result == GNUNET_OK)
1083 mq->specific_address->timeout =
1084 GNUNET_TIME_relative_to_absolute
1085 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1086 if (mq->specific_address->connected != GNUNET_YES)
1088 GNUNET_STATISTICS_update (stats,
1089 gettext_noop ("# connected addresses"),
1092 mq->specific_address->connected = GNUNET_YES;
1097 if (mq->specific_address->connected != GNUNET_NO)
1099 GNUNET_STATISTICS_update (stats,
1100 gettext_noop ("# connected addresses"),
1103 mq->specific_address->connected = GNUNET_NO;
1106 if (! mq->internal_msg)
1107 mq->specific_address->in_transmit = GNUNET_NO;
1109 if (mq->client != NULL)
1110 transmit_send_ok (mq->client, n, result);
1112 try_transmission_to_peer (n);
1117 * Find an address in any of the available transports for
1118 * the given neighbour that would be good for message
1119 * transmission. This is essentially the transport selection
1122 * @param neighbour for whom to select an address
1123 * @return selected address, NULL if we have none
1125 struct ForeignAddressList *
1126 find_ready_address(struct NeighbourList *neighbour)
1128 struct ReadyList *head = neighbour->plugins;
1129 struct ForeignAddressList *addresses;
1130 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1131 struct ForeignAddressList *best_address;
1133 best_address = NULL;
1134 while (head != NULL)
1136 addresses = head->addresses;
1137 while (addresses != NULL)
1139 if ( (addresses->timeout.value < now.value) &&
1140 (addresses->connected == GNUNET_YES) )
1143 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1144 "Marking long-time inactive connection to `%4s' as down.\n",
1145 GNUNET_i2s (&neighbour->id));
1147 GNUNET_STATISTICS_update (stats,
1148 gettext_noop ("# connected addresses"),
1151 addresses->connected = GNUNET_NO;
1153 addresses = addresses->next;
1156 addresses = head->addresses;
1157 while (addresses != NULL)
1159 #if DEBUG_TRANSPORT > 1
1160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1161 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1162 GNUNET_a2s (addresses->addr,
1163 addresses->addrlen),
1164 GNUNET_i2s (&neighbour->id),
1165 addresses->connected,
1166 addresses->in_transmit,
1167 addresses->validated,
1168 addresses->connect_attempts,
1169 (unsigned long long) addresses->timeout.value,
1170 (unsigned int) addresses->distance);
1172 if ( ( (best_address == NULL) ||
1173 (addresses->connected == GNUNET_YES) ||
1174 (best_address->connected == GNUNET_NO) ) &&
1175 (addresses->in_transmit == GNUNET_NO) &&
1176 ( (best_address == NULL) ||
1177 (addresses->latency.value < best_address->latency.value)) )
1178 best_address = addresses;
1179 /* FIXME: also give lower-latency addresses that are not
1180 connected a chance some times... */
1181 addresses = addresses->next;
1185 if (best_address != NULL)
1188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1189 "Best address found has latency of %llu ms.\n",
1190 best_address->latency.value);
1195 GNUNET_STATISTICS_update (stats,
1196 gettext_noop ("# transmission attempts failed (no address)"),
1200 return best_address;
1206 * We should re-try transmitting to the given peer,
1207 * hopefully we've learned something in the meantime.
1210 retry_transmission_task (void *cls,
1211 const struct GNUNET_SCHEDULER_TaskContext *tc)
1213 struct NeighbourList *n = cls;
1215 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1216 try_transmission_to_peer (n);
1221 * Check the ready list for the given neighbour and if a plugin is
1222 * ready for transmission (and if we have a message), do so!
1224 * @param neighbour target peer for which to transmit
1227 try_transmission_to_peer (struct NeighbourList *neighbour)
1229 struct ReadyList *rl;
1230 struct MessageQueue *mq;
1231 struct GNUNET_TIME_Relative timeout;
1235 if (neighbour->messages_head == NULL)
1238 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1239 "Transmission queue for `%4s' is empty\n",
1240 GNUNET_i2s (&neighbour->id));
1242 return; /* nothing to do */
1245 mq = neighbour->messages_head;
1246 force_address = GNUNET_YES;
1247 if (mq->specific_address == NULL)
1249 mq->specific_address = find_ready_address(neighbour);
1250 GNUNET_STATISTICS_update (stats,
1251 gettext_noop ("# transport selected peer address freely"),
1254 force_address = GNUNET_NO;
1256 if (mq->specific_address == NULL)
1258 GNUNET_STATISTICS_update (stats,
1259 gettext_noop ("# transport failed to selected peer address"),
1262 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1263 if (timeout.value == 0)
1266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1267 "No destination address available to transmit message of size %u to peer `%4s'\n",
1268 mq->message_buf_size,
1269 GNUNET_i2s (&mq->neighbour_id));
1271 GNUNET_STATISTICS_update (stats,
1272 gettext_noop ("# bytes in message queue for other peers"),
1273 - (int64_t) mq->message_buf_size,
1275 GNUNET_STATISTICS_update (stats,
1276 gettext_noop ("# bytes discarded (no destination address available)"),
1277 mq->message_buf_size,
1279 if (mq->client != NULL)
1280 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1281 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1282 neighbour->messages_tail,
1285 return; /* nobody ready */
1287 GNUNET_STATISTICS_update (stats,
1288 gettext_noop ("# message delivery deferred (no address)"),
1291 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1292 GNUNET_SCHEDULER_cancel (sched,
1293 neighbour->retry_task);
1294 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1296 &retry_transmission_task,
1299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1300 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1301 mq->message_buf_size,
1302 GNUNET_i2s (&mq->neighbour_id),
1305 /* FIXME: might want to trigger peerinfo lookup here
1306 (unless that's already pending...) */
1309 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1310 neighbour->messages_tail,
1312 if (mq->specific_address->connected == GNUNET_NO)
1313 mq->specific_address->connect_attempts++;
1314 rl = mq->specific_address->ready_list;
1315 mq->plugin = rl->plugin;
1316 if (!mq->internal_msg)
1317 mq->specific_address->in_transmit = GNUNET_YES;
1319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1320 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1321 mq->message_buf_size,
1322 GNUNET_i2s (&neighbour->id),
1323 GNUNET_a2s (mq->specific_address->addr,
1324 mq->specific_address->addrlen),
1325 rl->plugin->short_name);
1327 GNUNET_STATISTICS_update (stats,
1328 gettext_noop ("# bytes in message queue for other peers"),
1329 - (int64_t) mq->message_buf_size,
1331 GNUNET_STATISTICS_update (stats,
1332 gettext_noop ("# bytes pending with plugins"),
1333 mq->message_buf_size,
1335 ret = rl->plugin->api->send (rl->plugin->api->cls,
1338 mq->message_buf_size,
1340 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1341 mq->specific_address->addr,
1342 mq->specific_address->addrlen,
1344 &transmit_send_continuation, mq);
1347 /* failure, but 'send' would not call continuation in this case,
1348 so we need to do it here! */
1349 transmit_send_continuation (mq,
1357 * Send the specified message to the specified peer.
1359 * @param client source of the transmission request (can be NULL)
1360 * @param peer_address ForeignAddressList where we should send this message
1361 * @param priority how important is the message
1362 * @param timeout how long do we have to transmit?
1363 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1364 * @param message_buf_size total size of all messages in message_buf
1365 * @param is_internal is this an internal message; these are pre-pended and
1366 * also do not count for plugins being "ready" to transmit
1367 * @param neighbour handle to the neighbour for transmission
1370 transmit_to_peer (struct TransportClient *client,
1371 struct ForeignAddressList *peer_address,
1372 unsigned int priority,
1373 struct GNUNET_TIME_Relative timeout,
1374 const char *message_buf,
1375 size_t message_buf_size,
1376 int is_internal, struct NeighbourList *neighbour)
1378 struct MessageQueue *mq;
1383 /* check for duplicate submission */
1384 mq = neighbour->messages_head;
1387 if (mq->client == client)
1389 /* client transmitted to same peer twice
1390 before getting SEND_OK! */
1398 GNUNET_STATISTICS_update (stats,
1399 gettext_noop ("# bytes in message queue for other peers"),
1402 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1403 mq->specific_address = peer_address;
1404 mq->client = client;
1405 memcpy (&mq[1], message_buf, message_buf_size);
1406 mq->message_buf = (const char*) &mq[1];
1407 mq->message_buf_size = message_buf_size;
1408 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1409 mq->internal_msg = is_internal;
1410 mq->priority = priority;
1411 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1413 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1414 neighbour->messages_tail,
1417 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1418 neighbour->messages_tail,
1419 neighbour->messages_tail,
1421 try_transmission_to_peer (neighbour);
1428 struct GeneratorContext
1430 struct TransportPlugin *plug_pos;
1431 struct OwnAddressList *addr_pos;
1432 struct GNUNET_TIME_Absolute expiration;
1440 address_generator (void *cls, size_t max, void *buf)
1442 struct GeneratorContext *gc = cls;
1445 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1447 gc->plug_pos = gc->plug_pos->next;
1448 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1450 if (NULL == gc->plug_pos)
1455 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1458 gc->addr_pos->addrlen, buf, max);
1459 gc->addr_pos = gc->addr_pos->next;
1465 * Construct our HELLO message from all of the addresses of
1466 * all of the transports.
1471 struct GNUNET_HELLO_Message *hello;
1472 struct TransportClient *cpos;
1473 struct NeighbourList *npos;
1474 struct GeneratorContext gc;
1476 gc.plug_pos = plugins;
1477 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1478 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1479 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1482 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1484 GNUNET_STATISTICS_update (stats,
1485 gettext_noop ("# refreshed my HELLO"),
1489 while (cpos != NULL)
1491 transmit_to_client (cpos,
1492 (const struct GNUNET_MessageHeader *) hello,
1497 GNUNET_free_non_null (our_hello);
1499 our_hello_version++;
1500 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1502 while (npos != NULL)
1505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1506 "Transmitting updated `%s' to neighbour `%4s'\n",
1507 "HELLO", GNUNET_i2s (&npos->id));
1509 GNUNET_STATISTICS_update (stats,
1510 gettext_noop ("# transmitted my HELLO to other peers"),
1513 transmit_to_peer (NULL, NULL, 0,
1514 HELLO_ADDRESS_EXPIRATION,
1515 (const char *) our_hello,
1516 GNUNET_HELLO_size(our_hello),
1524 * Task used to clean up expired addresses for a plugin.
1526 * @param cls closure
1530 expire_address_task (void *cls,
1531 const struct GNUNET_SCHEDULER_TaskContext *tc);
1535 * Update the list of addresses for this plugin,
1536 * expiring those that are past their expiration date.
1538 * @param plugin addresses of which plugin should be recomputed?
1539 * @param fresh set to GNUNET_YES if a new address was added
1540 * and we need to regenerate the HELLO even if nobody
1544 update_addresses (struct TransportPlugin *plugin, int fresh)
1546 static struct GNUNET_TIME_Absolute last_update;
1547 struct GNUNET_TIME_Relative min_remaining;
1548 struct GNUNET_TIME_Relative remaining;
1549 struct GNUNET_TIME_Absolute now;
1550 struct OwnAddressList *pos;
1551 struct OwnAddressList *prev;
1552 struct OwnAddressList *next;
1555 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1556 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1557 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1558 now = GNUNET_TIME_absolute_get ();
1559 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1560 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1562 pos = plugin->addresses;
1566 if (pos->expires.value < now.value)
1568 expired = GNUNET_YES;
1570 plugin->addresses = pos->next;
1572 prev->next = pos->next;
1577 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1578 if (remaining.value < min_remaining.value)
1579 min_remaining = remaining;
1585 if (expired || fresh)
1590 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1591 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1593 plugin->address_update_task
1594 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1596 &expire_address_task, plugin);
1601 * Task used to clean up expired addresses for a plugin.
1603 * @param cls closure
1607 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1609 struct TransportPlugin *plugin = cls;
1610 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1611 update_addresses (plugin, GNUNET_NO);
1616 * Function that must be called by each plugin to notify the
1617 * transport service about the addresses under which the transport
1618 * provided by the plugin can be reached.
1620 * @param cls closure
1621 * @param name name of the transport that generated the address
1622 * @param addr one of the addresses of the host, NULL for the last address
1623 * the specific address format depends on the transport
1624 * @param addrlen length of the address
1625 * @param expires when should this address automatically expire?
1628 plugin_env_notify_address (void *cls,
1632 struct GNUNET_TIME_Relative expires)
1634 struct TransportPlugin *p = cls;
1635 struct OwnAddressList *al;
1636 struct GNUNET_TIME_Absolute abex;
1638 abex = GNUNET_TIME_relative_to_absolute (expires);
1639 GNUNET_assert (p == find_transport (name));
1644 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1646 if (al->expires.value < abex.value)
1653 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
1655 al->next = p->addresses;
1658 al->addrlen = addrlen;
1659 memcpy (&al[1], addr, addrlen);
1660 update_addresses (p, GNUNET_YES);
1665 * Notify all of our clients about a peer connecting.
1668 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1669 struct GNUNET_TIME_Relative latency,
1672 struct ConnectInfoMessage cim;
1673 struct TransportClient *cpos;
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1677 "Notifying clients about connection from `%s'\n",
1680 GNUNET_STATISTICS_update (stats,
1681 gettext_noop ("# peers connected"),
1684 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1685 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1686 cim.distance = htonl (distance);
1687 cim.latency = GNUNET_TIME_relative_hton (latency);
1688 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1690 while (cpos != NULL)
1692 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1699 * Notify all of our clients about a peer disconnecting.
1702 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1704 struct DisconnectInfoMessage dim;
1705 struct TransportClient *cpos;
1708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1709 "Notifying clients about lost connection to `%s'\n",
1712 GNUNET_STATISTICS_update (stats,
1713 gettext_noop ("# peers connected"),
1716 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1717 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1718 dim.reserved = htonl (0);
1719 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1721 while (cpos != NULL)
1723 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1730 * Find a ForeignAddressList entry for the given neighbour
1731 * that matches the given address and transport.
1733 * @param neighbour which peer we care about
1734 * @param tname name of the transport plugin
1735 * @param addr binary address
1736 * @param addrlen length of addr
1737 * @return NULL if no such entry exists
1739 static struct ForeignAddressList *
1740 find_peer_address(struct NeighbourList *neighbour,
1745 struct ReadyList *head;
1746 struct ForeignAddressList *address_head;
1748 head = neighbour->plugins;
1749 while (head != NULL)
1751 if (0 == strcmp (tname, head->plugin->short_name))
1758 address_head = head->addresses;
1759 while ( (address_head != NULL) &&
1760 ( (address_head->addrlen != addrlen) ||
1761 (memcmp(address_head->addr, addr, addrlen) != 0) ) )
1762 address_head = address_head->next;
1763 return address_head;
1768 * Get the peer address struct for the given neighbour and
1769 * address. If it doesn't yet exist, create it.
1771 * @param neighbour which peer we care about
1772 * @param tname name of the transport plugin
1773 * @param addr binary address
1774 * @param addrlen length of addr
1775 * @return NULL if we do not have a transport plugin for 'tname'
1777 static struct ForeignAddressList *
1778 add_peer_address (struct NeighbourList *neighbour,
1783 struct ReadyList *head;
1784 struct ForeignAddressList *ret;
1786 ret = find_peer_address (neighbour, tname, addr, addrlen);
1789 head = neighbour->plugins;
1790 while (head != NULL)
1792 if (0 == strcmp (tname, head->plugin->short_name))
1798 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
1799 ret->addr = (const char*) &ret[1];
1800 memcpy (&ret[1], addr, addrlen);
1801 ret->addrlen = addrlen;
1802 ret->expires = GNUNET_TIME_relative_to_absolute
1803 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1804 ret->latency = GNUNET_TIME_relative_get_forever();
1806 ret->timeout = GNUNET_TIME_relative_to_absolute
1807 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1808 ret->ready_list = head;
1809 ret->next = head->addresses;
1810 head->addresses = ret;
1816 * Closure for 'add_validated_address'.
1818 struct AddValidatedAddressContext
1821 * Entry that has been validated.
1823 const struct ValidationEntry *ve;
1826 * Flag set after we have added the address so
1827 * that we terminate the iteration next time.
1834 * Callback function used to fill a buffer of max bytes with a list of
1835 * addresses in the format used by HELLOs. Should use
1836 * "GNUNET_HELLO_add_address" as a helper function.
1838 * @param cls the 'struct AddValidatedAddressContext' with the validated address
1839 * @param max maximum number of bytes that can be written to buf
1840 * @param buf where to write the address information
1841 * @return number of bytes written, 0 to signal the
1842 * end of the iteration.
1845 add_validated_address (void *cls,
1846 size_t max, void *buf)
1848 struct AddValidatedAddressContext *avac = cls;
1849 const struct ValidationEntry *ve = avac->ve;
1851 if (GNUNET_YES == avac->done)
1853 avac->done = GNUNET_YES;
1854 return GNUNET_HELLO_add_address (ve->transport_name,
1855 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
1865 * Closure for 'check_address_exists'.
1867 struct CheckAddressExistsClosure
1870 * Address to check for.
1875 * Name of the transport.
1885 * Set to GNUNET_YES if the address exists.
1892 * Iterator over hash map entries. Checks if the given
1893 * validation entry is for the same address as what is given
1896 * @param cls the 'struct CheckAddressExistsClosure*'
1897 * @param key current key code (ignored)
1898 * @param value value in the hash map ('struct ValidationEntry')
1899 * @return GNUNET_YES if we should continue to
1900 * iterate (mismatch), GNUNET_NO if not (entry matched)
1903 check_address_exists (void *cls,
1904 const GNUNET_HashCode * key,
1907 struct CheckAddressExistsClosure *caec = cls;
1908 struct ValidationEntry *ve = value;
1909 if ( (0 == strcmp (caec->tname,
1910 ve->transport_name)) &&
1911 (caec->addrlen == ve->addrlen) &&
1912 (0 == memcmp (caec->addr,
1916 caec->exists = GNUNET_YES;
1924 * HELLO validation cleanup task (validation failed).
1926 * @param cls the 'struct ValidationEntry' that failed
1927 * @param tc scheduler context (unused)
1930 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1932 struct ValidationEntry *va = cls;
1933 struct GNUNET_PeerIdentity pid;
1935 GNUNET_STATISTICS_update (stats,
1936 gettext_noop ("# address validation timeouts"),
1939 GNUNET_CRYPTO_hash (&va->publicKey,
1941 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1943 GNUNET_CONTAINER_multihashmap_remove (validation_map,
1946 GNUNET_free (va->transport_name);
1952 neighbour_timeout_task (void *cls,
1953 const struct GNUNET_SCHEDULER_TaskContext *tc)
1955 struct NeighbourList *n = cls;
1958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1959 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1961 GNUNET_STATISTICS_update (stats,
1962 gettext_noop ("# disconnects due to timeout"),
1965 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1966 disconnect_neighbour (n, GNUNET_NO);
1971 * Schedule the job that will cause us to send a PING to the
1972 * foreign address to evaluate its validity and latency.
1974 * @param fal address to PING
1977 schedule_next_ping (struct ForeignAddressList *fal);
1981 * Add the given address to the list of foreign addresses
1982 * available for the given peer (check for duplicates).
1984 * @param cls the respective 'struct NeighbourList' to update
1985 * @param tname name of the transport
1986 * @param expiration expiration time
1987 * @param addr the address
1988 * @param addrlen length of the address
1989 * @return GNUNET_OK (always)
1992 add_to_foreign_address_list (void *cls,
1994 struct GNUNET_TIME_Absolute expiration,
1995 const void *addr, size_t addrlen)
1997 struct NeighbourList *n = cls;
1998 struct ForeignAddressList *fal;
2001 GNUNET_STATISTICS_update (stats,
2002 gettext_noop ("# valid peer addresses returned by peerinfo"),
2006 fal = find_peer_address (n, tname, addr, addrlen);
2010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2011 "Adding address `%s' (%s) for peer `%4s' due to peerinfo data for %llums.\n",
2012 GNUNET_a2s (addr, addrlen),
2014 GNUNET_i2s (&n->id),
2017 fal = add_peer_address (n, tname, addr, addrlen);
2020 GNUNET_STATISTICS_update (stats,
2021 gettext_noop ("# previously validated addresses lacking transport"),
2027 fal->expires = GNUNET_TIME_absolute_max (expiration,
2029 schedule_next_ping (fal);
2035 fal->expires = GNUNET_TIME_absolute_max (expiration,
2040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2041 "Failed to add new address for `%4s'\n",
2042 GNUNET_i2s (&n->id));
2045 if (fal->validated == GNUNET_NO)
2047 fal->validated = GNUNET_YES;
2048 GNUNET_STATISTICS_update (stats,
2049 gettext_noop ("# peer addresses considered valid"),
2053 if (try == GNUNET_YES)
2055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2056 "Have new addresses, will try to trigger transmissions.\n");
2057 try_transmission_to_peer (n);
2064 * Add addresses in validated HELLO "h" to the set of addresses
2065 * we have for this peer.
2067 * @param cls closure ('struct NeighbourList*')
2068 * @param peer id of the peer, NULL for last call
2069 * @param h hello message for the peer (can be NULL)
2070 * @param trust amount of trust we have in the peer (not used)
2073 add_hello_for_peer (void *cls,
2074 const struct GNUNET_PeerIdentity *peer,
2075 const struct GNUNET_HELLO_Message *h,
2078 struct NeighbourList *n = cls;
2086 return; /* no HELLO available */
2088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2089 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2093 if (GNUNET_YES != n->public_key_valid)
2095 GNUNET_HELLO_get_key (h, &n->publicKey);
2096 n->public_key_valid = GNUNET_YES;
2098 GNUNET_HELLO_iterate_addresses (h,
2100 &add_to_foreign_address_list,
2106 * Create a fresh entry in our neighbour list for the given peer.
2107 * Will try to transmit our current HELLO to the new neighbour.
2109 * @param peer the peer for which we create the entry
2110 * @return the new neighbour list entry
2112 static struct NeighbourList *
2113 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer)
2115 struct NeighbourList *n;
2116 struct TransportPlugin *tp;
2117 struct ReadyList *rl;
2119 GNUNET_assert (our_hello != NULL);
2120 GNUNET_STATISTICS_update (stats,
2121 gettext_noop ("# active neighbours"),
2124 n = GNUNET_malloc (sizeof (struct NeighbourList));
2125 n->next = neighbours;
2129 GNUNET_TIME_relative_to_absolute
2130 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2131 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2132 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2133 MAX_BANDWIDTH_CARRY_S);
2137 if (tp->api->send != NULL)
2139 rl = GNUNET_malloc (sizeof (struct ReadyList));
2141 rl->next = n->plugins;
2144 rl->addresses = NULL;
2148 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2150 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2151 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2152 &neighbour_timeout_task, n);
2153 n->piter = GNUNET_PEERINFO_iterate (cfg, sched, peer,
2154 0, GNUNET_TIME_UNIT_FOREVER_REL,
2155 &add_hello_for_peer, n);
2156 transmit_to_peer (NULL, NULL, 0,
2157 HELLO_ADDRESS_EXPIRATION,
2158 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2165 * Send periodic PING messages to a give foreign address.
2167 * @param cls our 'struct PeriodicValidationContext*'
2168 * @param tc task context
2171 send_periodic_ping (void *cls,
2172 const struct GNUNET_SCHEDULER_TaskContext *tc)
2174 struct ForeignAddressList *peer_address = cls;
2175 struct TransportPlugin *tp;
2176 struct ValidationEntry *va;
2177 struct NeighbourList *neighbour;
2178 struct TransportPingMessage ping;
2179 struct CheckAddressExistsClosure caec;
2181 uint16_t hello_size;
2184 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2185 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2187 tp = peer_address->ready_list->plugin;
2188 neighbour = peer_address->ready_list->neighbour;
2189 if (GNUNET_YES != neighbour->public_key_valid)
2191 /* no public key yet, try again later */
2192 schedule_next_ping (peer_address);
2195 caec.addr = peer_address->addr;
2196 caec.addrlen = peer_address->addrlen;
2197 caec.tname = tp->short_name;
2198 caec.exists = GNUNET_NO;
2199 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2200 &check_address_exists,
2202 if (caec.exists == GNUNET_YES)
2204 /* During validation attempts we will likely trigger the other
2205 peer trying to validate our address which in turn will cause
2206 it to send us its HELLO, so we expect to hit this case rather
2207 frequently. Only print something if we are very verbose. */
2208 #if DEBUG_TRANSPORT > 1
2209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2210 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2211 GNUNET_a2s (peer_address->addr,
2212 peer_address->addrlen),
2214 GNUNET_i2s (&neighbour->id));
2216 schedule_next_ping (peer_address);
2219 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
2220 va->transport_name = GNUNET_strdup (tp->short_name);
2221 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2223 va->send_time = GNUNET_TIME_absolute_get();
2224 va->addr = (const void*) &va[1];
2225 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
2226 va->addrlen = peer_address->addrlen;
2228 memcpy(&va->publicKey,
2229 &neighbour->publicKey,
2230 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2232 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2233 HELLO_VERIFICATION_TIMEOUT,
2234 &timeout_hello_validation,
2236 GNUNET_CONTAINER_multihashmap_put (validation_map,
2237 &neighbour->id.hashPubKey,
2239 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2240 hello_size = GNUNET_HELLO_size(our_hello);
2241 tsize = sizeof(struct TransportPingMessage) + hello_size;
2242 message_buf = GNUNET_malloc(tsize);
2243 ping.challenge = htonl(va->challenge);
2244 ping.header.size = htons(sizeof(struct TransportPingMessage));
2245 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2246 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
2247 memcpy(message_buf, our_hello, hello_size);
2248 memcpy(&message_buf[hello_size],
2250 sizeof(struct TransportPingMessage));
2251 #if DEBUG_TRANSPORT_REVALIDATION
2252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2253 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2254 GNUNET_a2s (peer_address->addr,
2255 peer_address->addrlen),
2257 GNUNET_i2s (&neighbour->id),
2258 "HELLO", hello_size,
2259 "PING", sizeof (struct TransportPingMessage));
2261 GNUNET_STATISTICS_update (stats,
2262 gettext_noop ("# PING messages sent for re-validation"),
2265 transmit_to_peer (NULL, peer_address,
2266 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2267 HELLO_VERIFICATION_TIMEOUT,
2269 GNUNET_YES, neighbour);
2270 GNUNET_free(message_buf);
2271 schedule_next_ping (peer_address);
2276 * Schedule the job that will cause us to send a PING to the
2277 * foreign address to evaluate its validity and latency.
2279 * @param fal address to PING
2282 schedule_next_ping (struct ForeignAddressList *fal)
2284 struct GNUNET_TIME_Relative delay;
2286 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
2288 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
2289 delay.value /= 2; /* do before expiration */
2290 delay = GNUNET_TIME_relative_min (delay,
2291 LATENCY_EVALUATION_MAX_DELAY);
2292 if (GNUNET_YES != fal->estimated)
2294 delay = GNUNET_TIME_UNIT_ZERO;
2295 fal->estimated = GNUNET_YES;
2297 if (GNUNET_YES == fal->connected)
2299 delay = GNUNET_TIME_relative_min (delay,
2300 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
2302 /* FIXME: also adjust delay based on how close the last
2303 observed latency is to the latency of the best alternative */
2304 /* bound how fast we can go */
2305 delay = GNUNET_TIME_relative_max (delay,
2306 GNUNET_TIME_UNIT_SECONDS);
2307 /* randomize a bit (to avoid doing all at the same time) */
2308 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
2309 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
2311 &send_periodic_ping,
2317 * Iterator over hash map entries. Checks if the given validation
2318 * entry is for the same challenge as what is given in the PONG.
2320 * @param cls the 'struct TransportPongMessage*'
2321 * @param key peer identity
2322 * @param value value in the hash map ('struct ValidationEntry')
2323 * @return GNUNET_YES if we should continue to
2324 * iterate (mismatch), GNUNET_NO if not (entry matched)
2327 check_pending_validation (void *cls,
2328 const GNUNET_HashCode * key,
2331 const struct TransportPongMessage *pong = cls;
2332 struct ValidationEntry *ve = value;
2333 struct AddValidatedAddressContext avac;
2334 unsigned int challenge = ntohl(pong->challenge);
2335 struct GNUNET_HELLO_Message *hello;
2336 struct GNUNET_PeerIdentity target;
2337 struct NeighbourList *n;
2338 struct ForeignAddressList *fal;
2340 if (ve->challenge != challenge)
2344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2345 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
2347 GNUNET_a2s ((const struct sockaddr *) ve->addr,
2349 ve->transport_name);
2351 GNUNET_STATISTICS_update (stats,
2352 gettext_noop ("# address validation successes"),
2355 /* create the updated HELLO */
2356 GNUNET_CRYPTO_hash (&ve->publicKey,
2357 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2358 &target.hashPubKey);
2359 avac.done = GNUNET_NO;
2361 hello = GNUNET_HELLO_create (&ve->publicKey,
2362 &add_validated_address,
2364 GNUNET_PEERINFO_add_peer (cfg, sched,
2367 GNUNET_free (hello);
2368 n = find_neighbour (&target);
2371 n->publicKey = ve->publicKey;
2372 n->public_key_valid = GNUNET_YES;
2373 fal = add_peer_address (n,
2377 GNUNET_assert (fal != NULL);
2378 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
2379 fal->validated = GNUNET_YES;
2380 GNUNET_STATISTICS_update (stats,
2381 gettext_noop ("# peer addresses considered valid"),
2384 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
2385 schedule_next_ping (fal);
2386 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
2387 n->latency = fal->latency;
2389 n->latency.value = (fal->latency.value + n->latency.value) / 2;
2390 n->distance = fal->distance;
2391 if (GNUNET_NO == n->received_pong)
2393 notify_clients_connect (&target, n->latency, n->distance);
2394 n->received_pong = GNUNET_YES;
2396 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2398 GNUNET_SCHEDULER_cancel (sched,
2400 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2401 try_transmission_to_peer (n);
2405 /* clean up validation entry */
2406 GNUNET_assert (GNUNET_YES ==
2407 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2410 GNUNET_SCHEDULER_cancel (sched,
2412 GNUNET_free (ve->transport_name);
2419 * Function that will be called if we receive a validation
2420 * of an address challenge that we transmitted to another
2421 * peer. Note that the validation should only be considered
2422 * acceptable if the challenge matches AND if the sender
2423 * address is at least a plausible address for this peer
2424 * (otherwise we may be seeing a MiM attack).
2426 * @param cls closure
2427 * @param message the pong message
2428 * @param peer who responded to our challenge
2429 * @param sender_address string describing our sender address (as observed
2430 * by the other peer in binary format)
2431 * @param sender_address_len number of bytes in 'sender_address'
2434 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
2435 const struct GNUNET_PeerIdentity *peer,
2436 const char *sender_address,
2437 size_t sender_address_len)
2439 #if DEBUG_TRANSPORT > 1
2440 /* we get tons of these that just get discarded, only log
2441 if we are quite verbose */
2442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2443 "Receiving `%s' message from `%4s'.\n", "PONG",
2446 GNUNET_STATISTICS_update (stats,
2447 gettext_noop ("# PONG messages received"),
2450 if (GNUNET_SYSERR !=
2451 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
2453 &check_pending_validation,
2456 /* This is *expected* to happen a lot since we send
2457 PONGs to *all* known addresses of the sender of
2458 the PING, so most likely we get multiple PONGs
2459 per PING, and all but the first PONG will end up
2460 here. So really we should not print anything here
2461 unless we want to be very, very verbose... */
2462 #if DEBUG_TRANSPORT > 2
2463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2464 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
2473 /* FIXME: add given address to potential pool of our addresses
2475 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
2476 _("Another peer saw us using the address `%s' via `%s'.\n"),
2477 GNUNET_a2s ((const struct sockaddr *) &pong[1],
2478 ntohs(pong->addrlen)),
2479 va->transport_name);
2485 * Check if the given address is already being validated; if not,
2486 * append the given address to the list of entries that are being be
2487 * validated and initiate validation.
2489 * @param cls closure ('struct CheckHelloValidatedContext *')
2490 * @param tname name of the transport
2491 * @param expiration expiration time
2492 * @param addr the address
2493 * @param addrlen length of the address
2494 * @return GNUNET_OK (always)
2497 run_validation (void *cls,
2499 struct GNUNET_TIME_Absolute expiration,
2500 const void *addr, size_t addrlen)
2502 struct CheckHelloValidatedContext *chvc = cls;
2503 struct GNUNET_PeerIdentity id;
2504 struct TransportPlugin *tp;
2505 struct ValidationEntry *va;
2506 struct NeighbourList *neighbour;
2507 struct ForeignAddressList *peer_address;
2508 struct TransportPingMessage ping;
2509 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2510 struct CheckAddressExistsClosure caec;
2512 uint16_t hello_size;
2515 GNUNET_STATISTICS_update (stats,
2516 gettext_noop ("# peer addresses scheduled for validation"),
2519 tp = find_transport (tname);
2522 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2523 GNUNET_ERROR_TYPE_BULK,
2525 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2527 GNUNET_STATISTICS_update (stats,
2528 gettext_noop ("# peer addresses not validated (no applicable transport plugin available)"),
2533 GNUNET_HELLO_get_key (chvc->hello, &pk);
2534 GNUNET_CRYPTO_hash (&pk,
2536 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2539 caec.addrlen = addrlen;
2541 caec.exists = GNUNET_NO;
2542 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2543 &check_address_exists,
2545 if (caec.exists == GNUNET_YES)
2547 /* During validation attempts we will likely trigger the other
2548 peer trying to validate our address which in turn will cause
2549 it to send us its HELLO, so we expect to hit this case rather
2550 frequently. Only print something if we are very verbose. */
2551 #if DEBUG_TRANSPORT > 1
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2553 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2554 GNUNET_a2s (addr, addrlen),
2558 GNUNET_STATISTICS_update (stats,
2559 gettext_noop ("# peer addresses not validated (in progress)"),
2564 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2565 va->transport_name = GNUNET_strdup (tname);
2566 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2568 va->send_time = GNUNET_TIME_absolute_get();
2569 va->addr = (const void*) &va[1];
2570 memcpy (&va[1], addr, addrlen);
2571 va->addrlen = addrlen;
2572 GNUNET_HELLO_get_key (chvc->hello,
2574 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2575 HELLO_VERIFICATION_TIMEOUT,
2576 &timeout_hello_validation,
2578 GNUNET_CONTAINER_multihashmap_put (validation_map,
2581 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2582 neighbour = find_neighbour(&id);
2583 if (neighbour == NULL)
2584 neighbour = setup_new_neighbour(&id);
2585 neighbour->publicKey = va->publicKey;
2586 neighbour->public_key_valid = GNUNET_YES;
2587 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2588 GNUNET_assert(peer_address != NULL);
2589 hello_size = GNUNET_HELLO_size(our_hello);
2590 tsize = sizeof(struct TransportPingMessage) + hello_size;
2591 message_buf = GNUNET_malloc(tsize);
2592 ping.challenge = htonl(va->challenge);
2593 ping.header.size = htons(sizeof(struct TransportPingMessage));
2594 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2595 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2596 memcpy(message_buf, our_hello, hello_size);
2597 memcpy(&message_buf[hello_size],
2599 sizeof(struct TransportPingMessage));
2601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2602 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2603 GNUNET_a2s (addr, addrlen),
2606 "HELLO", hello_size,
2607 "PING", sizeof (struct TransportPingMessage));
2609 GNUNET_STATISTICS_update (stats,
2610 gettext_noop ("# PING messages sent for initial validation"),
2613 transmit_to_peer (NULL, peer_address,
2614 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2615 HELLO_VERIFICATION_TIMEOUT,
2617 GNUNET_YES, neighbour);
2618 GNUNET_free(message_buf);
2624 * Check if addresses in validated hello "h" overlap with
2625 * those in "chvc->hello" and validate the rest.
2627 * @param cls closure
2628 * @param peer id of the peer, NULL for last call
2629 * @param h hello message for the peer (can be NULL)
2630 * @param trust amount of trust we have in the peer (not used)
2633 check_hello_validated (void *cls,
2634 const struct GNUNET_PeerIdentity *peer,
2635 const struct GNUNET_HELLO_Message *h,
2638 struct CheckHelloValidatedContext *chvc = cls;
2639 struct GNUNET_HELLO_Message *plain_hello;
2640 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2641 struct GNUNET_PeerIdentity target;
2642 struct NeighbourList *n;
2647 GNUNET_CONTAINER_DLL_remove (chvc_head,
2650 if (GNUNET_NO == chvc->hello_known)
2652 /* notify PEERINFO about the peer now, so that we at least
2653 have the public key if some other component needs it */
2654 GNUNET_HELLO_get_key (chvc->hello, &pk);
2655 GNUNET_CRYPTO_hash (&pk,
2656 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2657 &target.hashPubKey);
2658 plain_hello = GNUNET_HELLO_create (&pk,
2661 GNUNET_PEERINFO_add_peer (cfg, sched, &target, plain_hello);
2662 GNUNET_free (plain_hello);
2664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2665 "Peerinfo had no `%s' message for peer `%4s', full validation needed.\n",
2667 GNUNET_i2s (&target));
2669 GNUNET_STATISTICS_update (stats,
2670 gettext_noop ("# new HELLOs requiring full validation"),
2673 GNUNET_HELLO_iterate_addresses (chvc->hello,
2680 GNUNET_STATISTICS_update (stats,
2681 gettext_noop ("# duplicate HELLO (peer known)"),
2691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2692 "Peerinfo had `%s' message for peer `%4s', validating only new addresses.\n",
2696 chvc->hello_known = GNUNET_YES;
2697 n = find_neighbour (peer);
2700 GNUNET_HELLO_iterate_addresses (h,
2702 &add_to_foreign_address_list,
2704 try_transmission_to_peer (n);
2708 GNUNET_STATISTICS_update (stats,
2709 gettext_noop ("# no existing neighbour record (validating HELLO)"),
2713 GNUNET_STATISTICS_update (stats,
2714 gettext_noop ("# HELLO validations (update case)"),
2717 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2719 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
2725 * Process HELLO-message.
2727 * @param plugin transport involved, may be NULL
2728 * @param message the actual message
2729 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2732 process_hello (struct TransportPlugin *plugin,
2733 const struct GNUNET_MessageHeader *message)
2736 struct GNUNET_PeerIdentity target;
2737 const struct GNUNET_HELLO_Message *hello;
2738 struct CheckHelloValidatedContext *chvc;
2739 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2741 hsize = ntohs (message->size);
2742 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2743 (hsize < sizeof (struct GNUNET_MessageHeader)))
2746 return GNUNET_SYSERR;
2748 GNUNET_STATISTICS_update (stats,
2749 gettext_noop ("# HELLOs received for validation"),
2752 /* first, check if load is too high */
2753 if (GNUNET_SCHEDULER_get_load (sched,
2754 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
2756 GNUNET_STATISTICS_update (stats,
2757 gettext_noop ("# HELLOs ignored due to high load"),
2762 hello = (const struct GNUNET_HELLO_Message *) message;
2763 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2765 GNUNET_break_op (0);
2766 return GNUNET_SYSERR;
2768 GNUNET_CRYPTO_hash (&publicKey,
2769 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2770 &target.hashPubKey);
2771 if (0 == memcmp (&my_identity,
2773 sizeof (struct GNUNET_PeerIdentity)))
2775 GNUNET_STATISTICS_update (stats,
2776 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
2781 #if DEBUG_TRANSPORT > 1
2782 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2783 "Processing `%s' message for `%4s' of size %u\n",
2785 GNUNET_i2s (&target),
2786 GNUNET_HELLO_size(hello));
2788 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2789 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
2790 memcpy (&chvc[1], hello, hsize);
2791 GNUNET_CONTAINER_DLL_insert (chvc_head,
2794 /* finally, check if HELLO was previously validated
2795 (continuation will then schedule actual validation) */
2796 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2800 HELLO_VERIFICATION_TIMEOUT,
2801 &check_hello_validated, chvc);
2807 * The peer specified by the given neighbour has timed-out or a plugin
2808 * has disconnected. We may either need to do nothing (other plugins
2809 * still up), or trigger a full disconnect and clean up. This
2810 * function updates our state and does the necessary notifications.
2811 * Also notifies our clients that the neighbour is now officially
2814 * @param n the neighbour list entry for the peer
2815 * @param check should we just check if all plugins
2816 * disconnected or must we ask all plugins to
2820 disconnect_neighbour (struct NeighbourList *n, int check)
2822 struct ReadyList *rpos;
2823 struct NeighbourList *npos;
2824 struct NeighbourList *nprev;
2825 struct MessageQueue *mq;
2826 struct ForeignAddressList *peer_addresses;
2827 struct ForeignAddressList *peer_pos;
2829 if (GNUNET_YES == check)
2832 while (NULL != rpos)
2834 peer_addresses = rpos->addresses;
2835 while (peer_addresses != NULL)
2837 if (GNUNET_YES == peer_addresses->connected)
2838 return; /* still connected */
2839 peer_addresses = peer_addresses->next;
2845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2846 "Disconnecting from `%4s'\n",
2847 GNUNET_i2s (&n->id));
2849 /* remove n from neighbours list */
2852 while ((npos != NULL) && (npos != n))
2857 GNUNET_assert (npos != NULL);
2859 neighbours = n->next;
2861 nprev->next = n->next;
2863 /* notify all clients about disconnect */
2864 if (GNUNET_YES == n->received_pong)
2865 notify_clients_disconnect (&n->id);
2867 /* clean up all plugins, cancel connections and pending transmissions */
2868 while (NULL != (rpos = n->plugins))
2870 n->plugins = rpos->next;
2871 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
2872 while (rpos->addresses != NULL)
2874 peer_pos = rpos->addresses;
2875 rpos->addresses = peer_pos->next;
2876 if (peer_pos->connected == GNUNET_YES)
2877 GNUNET_STATISTICS_update (stats,
2878 gettext_noop ("# connected addresses"),
2881 if (GNUNET_YES == peer_pos->validated)
2882 GNUNET_STATISTICS_update (stats,
2883 gettext_noop ("# peer addresses considered valid"),
2886 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
2888 GNUNET_SCHEDULER_cancel (sched,
2889 peer_pos->revalidate_task);
2890 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2892 GNUNET_free(peer_pos);
2897 /* free all messages on the queue */
2898 while (NULL != (mq = n->messages_head))
2900 GNUNET_STATISTICS_update (stats,
2901 gettext_noop ("# bytes in message queue for other peers"),
2902 - (int64_t) mq->message_buf_size,
2904 GNUNET_STATISTICS_update (stats,
2905 gettext_noop ("# bytes discarded due to disconnect"),
2906 mq->message_buf_size,
2908 GNUNET_CONTAINER_DLL_remove (n->messages_head,
2911 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
2913 sizeof(struct GNUNET_PeerIdentity)));
2916 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2918 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2919 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2921 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2923 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
2924 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2926 if (n->piter != NULL)
2928 GNUNET_PEERINFO_iterate_cancel (n->piter);
2931 /* finally, free n itself */
2932 GNUNET_STATISTICS_update (stats,
2933 gettext_noop ("# active neighbours"),
2941 * We have received a PING message from someone. Need to send a PONG message
2942 * in response to the peer by any means necessary.
2945 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2946 const struct GNUNET_PeerIdentity *peer,
2947 const char *sender_address,
2948 size_t sender_address_len)
2950 struct TransportPlugin *plugin = cls;
2951 struct TransportPingMessage *ping;
2952 struct TransportPongMessage *pong;
2953 struct NeighbourList *n;
2954 struct ReadyList *rl;
2955 struct ForeignAddressList *fal;
2957 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
2959 GNUNET_break_op (0);
2960 return GNUNET_SYSERR;
2962 ping = (struct TransportPingMessage *) message;
2963 if (0 != memcmp (&ping->target,
2964 plugin->env.my_identity,
2965 sizeof (struct GNUNET_PeerIdentity)))
2967 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2968 _("Received `%s' message not destined for me!\n"),
2970 return GNUNET_SYSERR;
2973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2974 "Processing `%s' from `%s'\n",
2976 GNUNET_a2s ((const struct sockaddr *)sender_address,
2977 sender_address_len));
2979 GNUNET_STATISTICS_update (stats,
2980 gettext_noop ("# PING messages received"),
2983 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2984 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2985 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2986 pong->purpose.size =
2987 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2989 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2990 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
2991 pong->challenge = ping->challenge;
2992 pong->addrlen = htons(sender_address_len);
2993 memcpy(&pong->signer,
2995 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2996 memcpy (&pong[1], sender_address, sender_address_len);
2997 GNUNET_assert (GNUNET_OK ==
2998 GNUNET_CRYPTO_rsa_sign (my_private_key,
2999 &pong->purpose, &pong->signature));
3000 n = find_neighbour(peer);
3002 n = setup_new_neighbour(peer);
3003 /* first try reliable response transmission */
3007 fal = rl->addresses;
3010 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
3013 ntohs (pong->header.size),
3014 TRANSPORT_PONG_PRIORITY,
3015 HELLO_VERIFICATION_TIMEOUT,
3022 GNUNET_STATISTICS_update (stats,
3023 gettext_noop ("# PONGs unicast via reliable transport"),
3033 /* no reliable method found, do multicast */
3034 GNUNET_STATISTICS_update (stats,
3035 gettext_noop ("# PONGs multicast to all available addresses"),
3041 fal = rl->addresses;
3044 transmit_to_peer(NULL, fal,
3045 TRANSPORT_PONG_PRIORITY,
3046 HELLO_VERIFICATION_TIMEOUT,
3048 ntohs(pong->header.size),
3061 * Function called by the plugin for each received message.
3062 * Update data volumes, possibly notify plugins about
3063 * reducing the rate at which they read from the socket
3064 * and generally forward to our receive callback.
3066 * @param cls the "struct TransportPlugin *" we gave to the plugin
3067 * @param peer (claimed) identity of the other peer
3068 * @param message the message, NULL if we only care about
3069 * learning about the delay until we should receive again
3070 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
3071 * @param sender_address binary address of the sender (if observed)
3072 * @param sender_address_len number of bytes in sender_address
3073 * @return how long the plugin should wait until receiving more data
3074 * (plugins that do not support this, can ignore the return value)
3076 static struct GNUNET_TIME_Relative
3077 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
3078 const struct GNUNET_MessageHeader *message,
3079 unsigned int distance, const char *sender_address,
3080 size_t sender_address_len)
3082 struct ReadyList *service_context;
3083 struct TransportPlugin *plugin = cls;
3084 struct TransportClient *cpos;
3085 struct InboundMessage *im;
3086 struct ForeignAddressList *peer_address;
3088 struct NeighbourList *n;
3089 struct GNUNET_TIME_Relative ret;
3091 n = find_neighbour (peer);
3093 n = setup_new_neighbour (peer);
3094 service_context = n->plugins;
3095 while ((service_context != NULL) && (plugin != service_context->plugin))
3096 service_context = service_context->next;
3097 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
3098 if (message != NULL)
3100 peer_address = add_peer_address(n,
3103 sender_address_len);
3104 if (peer_address != NULL)
3106 peer_address->distance = distance;
3107 if (peer_address->connected == GNUNET_NO)
3109 /* FIXME: be careful here to not mark
3110 MULTIPLE addresses as connected! */
3111 peer_address->connected = GNUNET_YES;
3112 GNUNET_STATISTICS_update (stats,
3113 gettext_noop ("# connected addresses"),
3117 peer_address->timeout
3119 GNUNET_TIME_relative_to_absolute
3120 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
3121 schedule_next_ping (peer_address);
3123 /* update traffic received amount ... */
3124 msize = ntohs (message->size);
3125 GNUNET_STATISTICS_update (stats,
3126 gettext_noop ("# bytes received from other peers"),
3129 n->distance = distance;
3131 GNUNET_TIME_relative_to_absolute
3132 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
3133 GNUNET_SCHEDULER_cancel (sched,
3136 GNUNET_SCHEDULER_add_delayed (sched,
3137 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3138 &neighbour_timeout_task, n);
3139 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
3141 /* dropping message due to frequent inbound volume violations! */
3142 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
3143 GNUNET_ERROR_TYPE_BULK,
3145 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
3146 n->in_tracker.available_bytes_per_s__,
3147 n->quota_violation_count);
3148 GNUNET_STATISTICS_update (stats,
3149 gettext_noop ("# bandwidth quota violations by other peers"),
3152 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
3154 switch (ntohs (message->type))
3156 case GNUNET_MESSAGE_TYPE_HELLO:
3157 GNUNET_STATISTICS_update (stats,
3158 gettext_noop ("# HELLO messages received from other peers"),
3161 process_hello (plugin, message);
3163 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
3164 handle_ping(plugin, message, peer, sender_address, sender_address_len);
3166 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
3167 handle_pong(plugin, message, peer, sender_address, sender_address_len);
3171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3172 "Received message of type %u from `%4s', sending to all clients.\n",
3173 ntohs (message->type), GNUNET_i2s (peer));
3175 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3178 n->quota_violation_count++;
3180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3181 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3182 n->in_tracker.available_bytes_per_s__,
3183 n->quota_violation_count);
3185 /* Discount 32k per violation */
3186 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3191 if (n->quota_violation_count > 0)
3193 /* try to add 32k back */
3194 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3196 n->quota_violation_count--;
3199 GNUNET_STATISTICS_update (stats,
3200 gettext_noop ("# payload received from other peers"),
3203 /* transmit message to all clients */
3204 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3205 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3206 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3207 im->latency = GNUNET_TIME_relative_hton (n->latency);
3209 memcpy (&im[1], message, msize);
3211 while (cpos != NULL)
3213 transmit_to_client (cpos, &im->header, GNUNET_YES);
3219 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
3222 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3223 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
3224 (unsigned long long) n->in_tracker.consumption_since_last_update__,
3225 (unsigned int) n->in_tracker.available_bytes_per_s__,
3226 (unsigned long long) ret.value);
3227 GNUNET_STATISTICS_update (stats,
3228 gettext_noop ("# ms throttling suggested"),
3229 (int64_t) ret.value,
3237 * Handle START-message. This is the first message sent to us
3238 * by any client which causes us to add it to our list.
3240 * @param cls closure (always NULL)
3241 * @param client identification of the client
3242 * @param message the actual message
3245 handle_start (void *cls,
3246 struct GNUNET_SERVER_Client *client,
3247 const struct GNUNET_MessageHeader *message)
3249 struct TransportClient *c;
3250 struct ConnectInfoMessage cim;
3251 struct NeighbourList *n;
3254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3255 "Received `%s' request from client\n", "START");
3260 if (c->client == client)
3262 /* client already on our list! */
3264 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3269 c = GNUNET_malloc (sizeof (struct TransportClient));
3273 if (our_hello != NULL)
3276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3277 "Sending our own `%s' to new client\n", "HELLO");
3279 transmit_to_client (c,
3280 (const struct GNUNET_MessageHeader *) our_hello,
3282 /* tell new client about all existing connections */
3283 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
3284 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
3288 if (GNUNET_YES == n->received_pong)
3291 cim.latency = GNUNET_TIME_relative_hton (n->latency);
3292 cim.distance = htonl (n->distance);
3293 transmit_to_client (c, &cim.header, GNUNET_NO);
3298 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3303 * Handle HELLO-message.
3305 * @param cls closure (always NULL)
3306 * @param client identification of the client
3307 * @param message the actual message
3310 handle_hello (void *cls,
3311 struct GNUNET_SERVER_Client *client,
3312 const struct GNUNET_MessageHeader *message)
3316 GNUNET_STATISTICS_update (stats,
3317 gettext_noop ("# HELLOs received from clients"),
3320 ret = process_hello (NULL, message);
3321 GNUNET_SERVER_receive_done (client, ret);
3326 * Handle SEND-message.
3328 * @param cls closure (always NULL)
3329 * @param client identification of the client
3330 * @param message the actual message
3333 handle_send (void *cls,
3334 struct GNUNET_SERVER_Client *client,
3335 const struct GNUNET_MessageHeader *message)
3337 struct TransportClient *tc;
3338 struct NeighbourList *n;
3339 const struct OutboundMessage *obm;
3340 const struct GNUNET_MessageHeader *obmm;
3344 size = ntohs (message->size);
3346 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
3349 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3352 GNUNET_STATISTICS_update (stats,
3353 gettext_noop ("# payload received for other peers"),
3356 obm = (const struct OutboundMessage *) message;
3358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3359 "Received `%s' request from client with target `%4s'\n",
3360 "SEND", GNUNET_i2s (&obm->peer));
3362 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
3363 msize = ntohs (obmm->size);
3364 if (size != msize + sizeof (struct OutboundMessage))
3367 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3370 n = find_neighbour (&obm->peer);
3372 n = setup_new_neighbour (&obm->peer);
3374 while ((tc != NULL) && (tc->client != client))
3378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3379 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
3381 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
3383 transmit_to_peer (tc, NULL, ntohl (obm->priority),
3384 GNUNET_TIME_relative_ntoh (obm->timeout),
3386 ntohs (obmm->size), GNUNET_NO, n);
3387 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3392 * Handle SET_QUOTA-message.
3394 * @param cls closure (always NULL)
3395 * @param client identification of the client
3396 * @param message the actual message
3399 handle_set_quota (void *cls,
3400 struct GNUNET_SERVER_Client *client,
3401 const struct GNUNET_MessageHeader *message)
3403 const struct QuotaSetMessage *qsm =
3404 (const struct QuotaSetMessage *) message;
3405 struct NeighbourList *n;
3407 GNUNET_STATISTICS_update (stats,
3408 gettext_noop ("# SET QUOTA messages received"),
3411 n = find_neighbour (&qsm->peer);
3414 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3415 GNUNET_STATISTICS_update (stats,
3416 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
3422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3423 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
3425 (unsigned int) ntohl (qsm->quota.value__),
3426 (unsigned int) n->in_tracker.available_bytes_per_s__,
3427 GNUNET_i2s (&qsm->peer));
3429 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
3431 if (0 == ntohl (qsm->quota.value__))
3432 disconnect_neighbour (n, GNUNET_NO);
3433 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3438 * Take the given address and append it to the set of results send back to
3441 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
3442 * @param address the resolved name, NULL to indicate the last response
3445 transmit_address_to_client (void *cls, const char *address)
3447 struct GNUNET_SERVER_TransmitContext *tc = cls;
3450 if (NULL == address)
3453 slen = strlen (address) + 1;
3454 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
3455 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3456 if (NULL == address)
3457 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
3462 * Handle AddressLookup-message.
3464 * @param cls closure (always NULL)
3465 * @param client identification of the client
3466 * @param message the actual message
3469 handle_address_lookup (void *cls,
3470 struct GNUNET_SERVER_Client *client,
3471 const struct GNUNET_MessageHeader *message)
3473 const struct AddressLookupMessage *alum;
3474 struct TransportPlugin *lsPlugin;
3475 const char *nameTransport;
3476 const char *address;
3478 struct GNUNET_SERVER_TransmitContext *tc;
3479 struct GNUNET_TIME_Absolute timeout;
3480 struct GNUNET_TIME_Relative rtimeout;
3483 size = ntohs (message->size);
3484 if (size < sizeof (struct AddressLookupMessage))
3486 GNUNET_break_op (0);
3487 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3490 alum = (const struct AddressLookupMessage *) message;
3491 uint32_t addressLen = ntohl (alum->addrlen);
3492 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
3494 GNUNET_break_op (0);
3495 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3498 address = (const char *) &alum[1];
3499 nameTransport = (const char *) &address[addressLen];
3501 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
3503 GNUNET_break_op (0);
3504 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3507 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
3508 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
3509 numeric = ntohl (alum->numeric_only);
3510 lsPlugin = find_transport (nameTransport);
3511 if (NULL == lsPlugin)
3513 tc = GNUNET_SERVER_transmit_context_create (client);
3514 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
3515 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3516 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
3519 tc = GNUNET_SERVER_transmit_context_create (client);
3520 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
3522 address, addressLen,
3525 &transmit_address_to_client, tc);
3529 * List of handlers for the messages understood by this
3532 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3533 {&handle_start, NULL,
3534 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
3535 {&handle_hello, NULL,
3536 GNUNET_MESSAGE_TYPE_HELLO, 0},
3537 {&handle_send, NULL,
3538 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
3539 {&handle_set_quota, NULL,
3540 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
3541 {&handle_address_lookup, NULL,
3542 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
3549 * Setup the environment for this plugin.
3552 create_environment (struct TransportPlugin *plug)
3554 plug->env.cfg = cfg;
3555 plug->env.sched = sched;
3556 plug->env.my_identity = &my_identity;
3557 plug->env.cls = plug;
3558 plug->env.receive = &plugin_env_receive;
3559 plug->env.notify_address = &plugin_env_notify_address;
3560 plug->env.max_connections = max_connect_per_transport;
3561 plug->env.stats = stats;
3566 * Start the specified transport (load the plugin).
3569 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
3571 struct TransportPlugin *plug;
3574 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3575 _("Loading `%s' transport plugin\n"), name);
3576 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
3577 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
3578 create_environment (plug);
3579 plug->short_name = GNUNET_strdup (name);
3580 plug->lib_name = libname;
3581 plug->next = plugins;
3583 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
3584 if (plug->api == NULL)
3586 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3587 _("Failed to load transport plugin for `%s'\n"), name);
3588 GNUNET_free (plug->short_name);
3589 plugins = plug->next;
3590 GNUNET_free (libname);
3597 * Called whenever a client is disconnected. Frees our
3598 * resources associated with that client.
3600 * @param cls closure
3601 * @param client identification of the client
3604 client_disconnect_notification (void *cls,
3605 struct GNUNET_SERVER_Client *client)
3607 struct TransportClient *pos;
3608 struct TransportClient *prev;
3609 struct ClientMessageQueueEntry *mqe;
3614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3615 "Client disconnected, cleaning up.\n");
3619 while ((pos != NULL) && (pos->client != client))
3626 while (NULL != (mqe = pos->message_queue_head))
3628 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
3629 pos->message_queue_tail,
3631 pos->message_count--;
3635 clients = pos->next;
3637 prev->next = pos->next;
3638 if (GNUNET_YES == pos->tcs_pending)
3643 if (pos->th != NULL)
3645 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
3648 GNUNET_break (0 == pos->message_count);
3654 * Iterator to free entries in the validation_map.
3656 * @param cls closure (unused)
3657 * @param key current key code
3658 * @param value value in the hash map (validation to abort)
3659 * @return GNUNET_YES (always)
3662 abort_validation (void *cls,
3663 const GNUNET_HashCode * key,
3666 struct ValidationEntry *va = value;
3668 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
3669 GNUNET_free (va->transport_name);
3676 * Function called when the service shuts down. Unloads our plugins
3677 * and cancels pending validations.
3679 * @param cls closure, unused
3680 * @param tc task context (unused)
3683 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3685 struct TransportPlugin *plug;
3686 struct OwnAddressList *al;
3687 struct CheckHelloValidatedContext *chvc;
3689 while (neighbours != NULL)
3690 disconnect_neighbour (neighbours, GNUNET_NO);
3692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3693 "Transport service is unloading plugins...\n");
3695 while (NULL != (plug = plugins))
3697 plugins = plug->next;
3698 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3699 GNUNET_free (plug->lib_name);
3700 GNUNET_free (plug->short_name);
3701 while (NULL != (al = plug->addresses))
3703 plug->addresses = al->next;
3708 if (my_private_key != NULL)
3709 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3710 GNUNET_free_non_null (our_hello);
3712 /* free 'chvc' data structure */
3713 while (NULL != (chvc = chvc_head))
3715 chvc_head = chvc->next;
3716 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
3721 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3724 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3725 validation_map = NULL;
3728 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3735 * Initiate transport service.
3737 * @param cls closure
3738 * @param s scheduler to use
3739 * @param serv the initialized server
3740 * @param c configuration to use
3744 struct GNUNET_SCHEDULER_Handle *s,
3745 struct GNUNET_SERVER_Handle *serv,
3746 const struct GNUNET_CONFIGURATION_Handle *c)
3751 unsigned long long tneigh;
3756 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
3757 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
3758 /* parse configuration */
3760 GNUNET_CONFIGURATION_get_value_number (c,
3765 GNUNET_CONFIGURATION_get_value_filename (c,
3767 "HOSTKEY", &keyfile)))
3769 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3771 ("Transport service is lacking key configuration settings. Exiting.\n"));
3772 GNUNET_SCHEDULER_shutdown (s);
3775 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3778 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3779 validation_map = NULL;
3782 max_connect_per_transport = (uint32_t) tneigh;
3783 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3784 GNUNET_free (keyfile);
3785 if (my_private_key == NULL)
3787 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3789 ("Transport service could not access hostkey. Exiting.\n"));
3790 GNUNET_SCHEDULER_shutdown (s);
3793 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3796 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3797 validation_map = NULL;
3800 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3801 GNUNET_CRYPTO_hash (&my_public_key,
3802 sizeof (my_public_key), &my_identity.hashPubKey);
3803 /* setup notification */
3805 GNUNET_SERVER_disconnect_notify (server,
3806 &client_disconnect_notification, NULL);
3807 /* load plugins... */
3810 GNUNET_CONFIGURATION_get_value_string (c,
3811 "TRANSPORT", "PLUGINS", &plugs))
3813 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3814 _("Starting transport plugins `%s'\n"), plugs);
3815 pos = strtok (plugs, " ");
3818 start_transport (server, pos);
3820 pos = strtok (NULL, " ");
3822 GNUNET_free (plugs);
3824 GNUNET_SCHEDULER_add_delayed (sched,
3825 GNUNET_TIME_UNIT_FOREVER_REL,
3826 &shutdown_task, NULL);
3831 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3833 /* process client requests */
3834 GNUNET_SERVER_add_handlers (server, handlers);
3839 * The main function for the transport service.
3841 * @param argc number of arguments from the command line
3842 * @param argv command line arguments
3843 * @return 0 ok, 1 on error
3846 main (int argc, char *const *argv)
3848 return (GNUNET_OK ==
3849 GNUNET_SERVICE_run (argc,
3852 GNUNET_SERVICE_OPTION_NONE,
3853 &run, NULL)) ? 0 : 1;
3856 /* end of gnunet-service-transport.c */