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
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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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 * - bi-directional nature of TCP is not exploited
30 * - This code uses 'GNUNET_a2s' for debug printing in many places,
31 * which is technically wrong since it assumes we have IP+Port
32 * (v4/v6) addresses. Once we add transports like http or smtp
33 * this will have to be changed!
36 #include "gnunet_client_lib.h"
37 #include "gnunet_container_lib.h"
38 #include "gnunet_constants.h"
39 #include "gnunet_getopt_lib.h"
40 #include "gnunet_hello_lib.h"
41 #include "gnunet_os_lib.h"
42 #include "gnunet_peerinfo_service.h"
43 #include "gnunet_plugin_lib.h"
44 #include "gnunet_protocols.h"
45 #include "gnunet_service_lib.h"
46 #include "gnunet_signatures.h"
47 #include "plugin_transport.h"
48 #include "transport.h"
51 * Should we do some additional checks (to validate behavior
54 #define EXTRA_CHECKS GNUNET_YES
57 * How many messages can we have pending for a given client process
58 * before we start to drop incoming messages? We typically should
59 * have only one client and so this would be the primary buffer for
60 * messages, so the number should be chosen rather generously.
62 * The expectation here is that most of the time the queue is large
63 * enough so that a drop is virtually never required.
65 #define MAX_PENDING 128
68 * How often should we try to reconnect to a peer using a particular
69 * transport plugin before giving up? Note that the plugin may be
70 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
72 #define MAX_CONNECT_RETRY 3
75 * Limit on the number of ready-to-run tasks when validating
76 * HELLOs. If more tasks are ready to run, we will drop
77 * HELLOs instead of validating them.
79 #define MAX_HELLO_LOAD 4
82 * How often must a peer violate bandwidth quotas before we start
83 * to simply drop its messages?
85 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
88 * How long until a HELLO verification attempt should time out?
89 * Must be rather small, otherwise a partially successful HELLO
90 * validation (some addresses working) might not be available
91 * before a client's request for a connection fails for good.
92 * Besides, if a single request to an address takes a long time,
93 * then the peer is unlikely worthwhile anyway.
95 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
98 * How long will we allow sending of a ping to be delayed?
100 #define TRANSPORT_DEFAULT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
103 * Priority to use for PONG messages.
105 #define TRANSPORT_PONG_PRIORITY 4
108 * How often do we re-add (cheaper) plugins to our list of plugins
109 * to try for a given connected peer?
111 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
114 * After how long do we expire an address in a HELLO that we just
115 * validated? This value is also used for our own addresses when we
118 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
122 * How long before an existing address expires should we again try to
123 * validate it? Must be (significantly) smaller than
124 * HELLO_ADDRESS_EXPIRATION.
126 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
129 * Maximum frequency for re-evaluating latencies for all transport addresses.
131 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
134 * Maximum frequency for re-evaluating latencies for connected addresses.
136 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
140 * List of addresses of other peers
142 struct ForeignAddressList
145 * This is a linked list.
147 struct ForeignAddressList *next;
150 * Which ready list does this entry belong to.
152 struct ReadyList *ready_list;
155 * How long until we auto-expire this address (unless it is
156 * re-confirmed by the transport)?
158 struct GNUNET_TIME_Absolute expires;
161 * Task used to re-validate addresses, updates latencies and
164 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
177 * What was the last latency observed for this address, plugin and peer?
179 struct GNUNET_TIME_Relative latency;
182 * If we did not successfully transmit a message to the given peer
183 * via this connection during the specified time, we should consider
184 * the connection to be dead. This is used in the case that a TCP
185 * transport simply stalls writing to the stream but does not
186 * formerly get a signal that the other peer died.
188 struct GNUNET_TIME_Absolute timeout;
191 * How often have we tried to connect using this plugin? Used to
192 * discriminate against addresses that do not work well.
193 * FIXME: not yet used, but should be!
195 unsigned int connect_attempts;
198 * DV distance to this peer (1 if no DV is used).
199 * FIXME: need to set this from transport plugins!
204 * Have we ever estimated the latency of this address? Used to
205 * ensure that the first time we add an address, we immediately
211 * Are we currently connected via this address? The first time we
212 * successfully transmit or receive data to a peer via a particular
213 * address, we set this to GNUNET_YES. If we later get an error
214 * (disconnect notification, transmission failure, timeout), we set
215 * it back to GNUNET_NO.
220 * Is this plugin currently busy transmitting to the specific target?
221 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
222 * messages do not count as 'in transmit'.
227 * Has this address been validated yet?
235 * Entry in linked list of network addresses for ourselves.
237 struct OwnAddressList
240 * This is a linked list.
242 struct OwnAddressList *next;
245 * The address, actually a pointer to the end
246 * of this struct. Do not free!
251 * How long until we auto-expire this address (unless it is
252 * re-confirmed by the transport)?
254 struct GNUNET_TIME_Absolute expires;
265 * Entry in linked list of all of our plugins.
267 struct TransportPlugin
271 * This is a linked list.
273 struct TransportPlugin *next;
276 * API of the transport as returned by the plugin's
277 * initialization function.
279 struct GNUNET_TRANSPORT_PluginFunctions *api;
282 * Short name for the plugin (i.e. "tcp").
287 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
292 * List of our known addresses for this transport.
294 struct OwnAddressList *addresses;
297 * Environment this transport service is using
300 struct GNUNET_TRANSPORT_PluginEnvironment env;
303 * ID of task that is used to clean up expired addresses.
305 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
308 * Set to GNUNET_YES if we need to scrap the existing
309 * list of "addresses" and start fresh when we receive
310 * the next address update from a transport. Set to
311 * GNUNET_NO if we should just add the new address
312 * to the list and wait for the commit call.
318 struct NeighbourList;
321 * For each neighbour we keep a list of messages
322 * that we still want to transmit to the neighbour.
328 * This is a doubly linked list.
330 struct MessageQueue *next;
333 * This is a doubly linked list.
335 struct MessageQueue *prev;
338 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
339 * stuck together in memory. Allocated at the end of this struct.
341 const char *message_buf;
344 * Size of the message buf
346 size_t message_buf_size;
349 * Client responsible for queueing the message;
350 * used to check that a client has no two messages
351 * pending for the same target. Can be NULL.
353 struct TransportClient *client;
356 * Using which specific address should we send this message?
358 struct ForeignAddressList *specific_address;
361 * Peer ID of the Neighbour this entry belongs to.
363 struct GNUNET_PeerIdentity neighbour_id;
366 * Plugin that we used for the transmission.
367 * NULL until we scheduled a transmission.
369 struct TransportPlugin *plugin;
372 * At what time should we fail?
374 struct GNUNET_TIME_Absolute timeout;
377 * Internal message of the transport system that should not be
378 * included in the usual SEND-SEND_OK transmission confirmation
379 * traffic management scheme. Typically, "internal_msg" will
380 * be set whenever "client" is NULL (but it is not strictly
386 * How important is the message?
388 unsigned int priority;
394 * For a given Neighbour, which plugins are available
395 * to talk to this peer and what are their costs?
400 * This is a linked list.
402 struct ReadyList *next;
405 * Which of our transport plugins does this entry
408 struct TransportPlugin *plugin;
411 * Transport addresses, latency, and readiness for
412 * this particular plugin.
414 struct ForeignAddressList *addresses;
417 * To which neighbour does this ready list belong to?
419 struct NeighbourList *neighbour;
425 * Entry in linked list of all of our current neighbours.
431 * This is a linked list.
433 struct NeighbourList *next;
436 * Which of our transports is connected to this peer
437 * and what is their status?
439 struct ReadyList *plugins;
442 * Head of list of messages we would like to send to this peer;
443 * must contain at most one message per client.
445 struct MessageQueue *messages_head;
448 * Tail of list of messages we would like to send to this peer; must
449 * contain at most one message per client.
451 struct MessageQueue *messages_tail;
454 * Context for peerinfo iteration.
455 * NULL after we are done processing peerinfo's information.
457 struct GNUNET_PEERINFO_IteratorContext *piter;
460 * Public key for this peer. Valid only if the respective flag is set below.
462 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
465 * Identity of this neighbour.
467 struct GNUNET_PeerIdentity id;
470 * ID of task scheduled to run when this peer is about to
471 * time out (will free resources associated with the peer).
473 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
476 * ID of task scheduled to run when we should retry transmitting
477 * the head of the message queue. Actually triggered when the
478 * transmission is timing out (we trigger instantly when we have
479 * a chance of success).
481 GNUNET_SCHEDULER_TaskIdentifier retry_task;
484 * How long until we should consider this peer dead
485 * (if we don't receive another message in the
488 struct GNUNET_TIME_Absolute peer_timeout;
491 * Tracker for inbound bandwidth.
493 struct GNUNET_BANDWIDTH_Tracker in_tracker;
496 * The latency we have seen for this particular address for
497 * this particular peer. This latency may have been calculated
498 * over multiple transports. This value reflects how long it took
499 * us to receive a response when SENDING via this particular
500 * transport/neighbour/address combination!
502 * FIXME: we need to periodically send PINGs to update this
503 * latency (at least more often than the current "huge" (11h?)
506 struct GNUNET_TIME_Relative latency;
509 * How often has the other peer (recently) violated the
510 * inbound traffic limit? Incremented by 10 per violation,
511 * decremented by 1 per non-violation (for each
514 unsigned int quota_violation_count;
517 * DV distance to this peer (1 if no DV is used).
522 * Have we seen an PONG from this neighbour in the past (and
523 * not had a disconnect since)?
528 * Do we have a valid public key for this neighbour?
530 int public_key_valid;
535 * Message used to ask a peer to validate receipt (to check an address
538 struct TransportPingMessage
542 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
544 struct GNUNET_MessageHeader header;
547 * Random challenge number (in network byte order).
549 uint32_t challenge GNUNET_PACKED;
552 * Who is the intended recipient?
554 struct GNUNET_PeerIdentity target;
560 * Message used to validate a HELLO. The challenge is included in the
561 * confirmation to make matching of replies to requests possible. The
562 * signature signs the original challenge number, our public key, the
563 * sender's address (so that the sender can check that the address we
564 * saw is plausible for him and possibly detect a MiM attack) and a
565 * timestamp (to limit replay).<p>
567 * This message is followed by the address of the
568 * client that we are observing (which is part of what
571 struct TransportPongMessage
575 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
577 struct GNUNET_MessageHeader header;
580 * For padding, always zero.
582 uint32_t reserved GNUNET_PACKED;
587 struct GNUNET_CRYPTO_RsaSignature signature;
590 * What are we signing and why?
592 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
595 * Random challenge number (in network byte order).
597 uint32_t challenge GNUNET_PACKED;
600 * Who signed this message?
602 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
605 * Size of address appended to this message
613 * Linked list of messages to be transmitted to the client. Each
614 * entry is followed by the actual message.
616 struct ClientMessageQueueEntry
619 * This is a doubly-linked list.
621 struct ClientMessageQueueEntry *next;
624 * This is a doubly-linked list.
626 struct ClientMessageQueueEntry *prev;
631 * Client connected to the transport service.
633 struct TransportClient
637 * This is a linked list.
639 struct TransportClient *next;
642 * Handle to the client.
644 struct GNUNET_SERVER_Client *client;
647 * Linked list of messages yet to be transmitted to
650 struct ClientMessageQueueEntry *message_queue_head;
653 * Tail of linked list of messages yet to be transmitted to the
656 struct ClientMessageQueueEntry *message_queue_tail;
659 * Current transmit request handle.
661 struct GNUNET_CONNECTION_TransmitHandle *th;
664 * Is a call to "transmit_send_continuation" pending? If so, we
665 * must not free this struct (even if the corresponding client
666 * disconnects) and instead only remove it from the linked list and
667 * set the "client" field to NULL.
672 * Length of the list of messages pending for this client.
674 unsigned int message_count;
680 * Entry in map of all HELLOs awaiting validation.
682 struct ValidationEntry
686 * The address, actually a pointer to the end
687 * of this struct. Do not free!
692 * Name of the transport.
694 char *transport_name;
697 * The public key of the peer.
699 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
702 * ID of task that will clean up this entry if we don't succeed
703 * with the validation first.
705 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
708 * At what time did we send this validation?
710 struct GNUNET_TIME_Absolute send_time;
718 * Challenge number we used.
726 * Context of currently active requests to peerinfo
727 * for validation of HELLOs.
729 struct CheckHelloValidatedContext
733 * This is a doubly-linked list.
735 struct CheckHelloValidatedContext *next;
738 * This is a doubly-linked list.
740 struct CheckHelloValidatedContext *prev;
743 * Hello that we are validating.
745 const struct GNUNET_HELLO_Message *hello;
748 * Context for peerinfo iteration.
749 * NULL after we are done processing peerinfo's information.
751 struct GNUNET_PEERINFO_IteratorContext *piter;
754 * Was a HELLO known for this peer to peerinfo?
764 static struct GNUNET_HELLO_Message *our_hello;
767 * "version" of "our_hello". Used to see if a given neighbour has
768 * already been sent the latest version of our HELLO message.
770 static unsigned int our_hello_version;
775 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
780 static struct GNUNET_PeerIdentity my_identity;
785 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
790 struct GNUNET_SCHEDULER_Handle *sched;
795 const struct GNUNET_CONFIGURATION_Handle *cfg;
798 * Linked list of all clients to this service.
800 static struct TransportClient *clients;
803 * All loaded plugins.
805 static struct TransportPlugin *plugins;
810 static struct GNUNET_SERVER_Handle *server;
813 * All known neighbours and their HELLOs.
815 static struct NeighbourList *neighbours;
818 * Number of neighbours we'd like to have.
820 static uint32_t max_connect_per_transport;
823 * Head of linked list.
825 static struct CheckHelloValidatedContext *chvc_head;
828 * Tail of linked list.
830 static struct CheckHelloValidatedContext *chvc_tail;
833 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
834 * of the given peer that we are currently validating).
836 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
839 * Handle for reporting statistics.
841 static struct GNUNET_STATISTICS_Handle *stats;
845 * The peer specified by the given neighbour has timed-out or a plugin
846 * has disconnected. We may either need to do nothing (other plugins
847 * still up), or trigger a full disconnect and clean up. This
848 * function updates our state and do the necessary notifications.
849 * Also notifies our clients that the neighbour is now officially
852 * @param n the neighbour list entry for the peer
853 * @param check should we just check if all plugins
854 * disconnected or must we ask all plugins to
857 static void disconnect_neighbour (struct NeighbourList *n, int check);
860 * Check the ready list for the given neighbour and if a plugin is
861 * ready for transmission (and if we have a message), do so!
863 * @param neighbour target peer for which to transmit
865 static void try_transmission_to_peer (struct NeighbourList *neighbour);
869 * Find an entry in the neighbour list for a particular peer.
870 * if sender_address is not specified (NULL) then return the
871 * first matching entry. If sender_address is specified, then
872 * make sure that the address and address_len also matches.
874 * FIXME: This description does not fit the function.
876 * @return NULL if not found.
878 static struct NeighbourList *
879 find_neighbour (const struct GNUNET_PeerIdentity *key)
881 struct NeighbourList *head = neighbours;
883 while ((head != NULL) &&
884 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
891 * Find an entry in the transport list for a particular transport.
893 * @return NULL if not found.
895 static struct TransportPlugin *
896 find_transport (const char *short_name)
898 struct TransportPlugin *head = plugins;
899 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
906 * Function called to notify a client about the socket being ready to
907 * queue more data. "buf" will be NULL and "size" zero if the socket
908 * was closed for writing in the meantime.
911 * @param size number of bytes available in buf
912 * @param buf where the callee should write the message
913 * @return number of bytes written to buf
916 transmit_to_client_callback (void *cls, size_t size, void *buf)
918 struct TransportClient *client = cls;
919 struct ClientMessageQueueEntry *q;
922 const struct GNUNET_MessageHeader *msg;
928 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
929 "Transmission to client failed, closing connection.\n");
930 /* fatal error with client, free message queue! */
931 while (NULL != (q = client->message_queue_head))
933 GNUNET_STATISTICS_update (stats,
934 gettext_noop ("# bytes discarded (could not transmit to client)"),
935 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
937 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
938 client->message_queue_tail,
942 client->message_count = 0;
947 while (NULL != (q = client->message_queue_head))
949 msg = (const struct GNUNET_MessageHeader *) &q[1];
950 msize = ntohs (msg->size);
951 if (msize + tsize > size)
954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
955 "Transmitting message of type %u to client.\n",
958 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
959 client->message_queue_tail,
961 memcpy (&cbuf[tsize], msg, msize);
964 client->message_count--;
968 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
969 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
971 GNUNET_TIME_UNIT_FOREVER_REL,
972 &transmit_to_client_callback,
974 GNUNET_assert (client->th != NULL);
981 * Send the specified message to the specified client. Since multiple
982 * messages may be pending for the same client at a time, this code
983 * makes sure that no message is lost.
985 * @param client client to transmit the message to
986 * @param msg the message to send
987 * @param may_drop can this message be dropped if the
988 * message queue for this client is getting far too large?
991 transmit_to_client (struct TransportClient *client,
992 const struct GNUNET_MessageHeader *msg, int may_drop)
994 struct ClientMessageQueueEntry *q;
997 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
999 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1001 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
1002 client->message_count, MAX_PENDING);
1003 /* TODO: call to statistics... */
1006 msize = ntohs (msg->size);
1007 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1008 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1009 memcpy (&q[1], msg, msize);
1010 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1011 client->message_queue_tail,
1012 client->message_queue_tail,
1014 client->message_count++;
1015 if (client->th == NULL)
1017 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1019 GNUNET_TIME_UNIT_FOREVER_REL,
1020 &transmit_to_client_callback,
1022 GNUNET_assert (client->th != NULL);
1028 * Transmit a 'SEND_OK' notification to the given client for the
1031 * @param client who to notify
1032 * @param n neighbour to notify about
1033 * @param result status code for the transmission request
1036 transmit_send_ok (struct TransportClient *client,
1037 struct NeighbourList *n,
1040 struct SendOkMessage send_ok_msg;
1042 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1043 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1044 send_ok_msg.success = htonl (result);
1045 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1046 send_ok_msg.peer = n->id;
1047 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1052 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1053 * upon "completion" of a send request. This tells the API
1054 * that it is now legal to send another message to the given
1057 * @param cls closure, identifies the entry on the
1058 * message queue that was transmitted and the
1059 * client responsible for queueing the message
1060 * @param target the peer receiving the message
1061 * @param result GNUNET_OK on success, if the transmission
1062 * failed, we should not tell the client to transmit
1066 transmit_send_continuation (void *cls,
1067 const struct GNUNET_PeerIdentity *target,
1070 struct MessageQueue *mq = cls;
1071 struct NeighbourList *n;
1073 GNUNET_STATISTICS_update (stats,
1074 gettext_noop ("# bytes pending with plugins"),
1075 -mq->message_buf_size,
1077 if (result == GNUNET_OK)
1079 GNUNET_STATISTICS_update (stats,
1080 gettext_noop ("# bytes successfully transmitted by plugins"),
1081 mq->message_buf_size,
1086 GNUNET_STATISTICS_update (stats,
1087 gettext_noop ("# bytes with transmission failure by plugins"),
1088 mq->message_buf_size,
1091 n = find_neighbour(&mq->neighbour_id);
1092 GNUNET_assert (n != NULL);
1093 if (mq->specific_address != NULL)
1095 if (result == GNUNET_OK)
1097 mq->specific_address->timeout =
1098 GNUNET_TIME_relative_to_absolute
1099 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1100 if (mq->specific_address->connected != GNUNET_YES)
1102 GNUNET_STATISTICS_update (stats,
1103 gettext_noop ("# connected addresses"),
1106 mq->specific_address->connected = GNUNET_YES;
1111 if (mq->specific_address->connected != GNUNET_NO)
1113 GNUNET_STATISTICS_update (stats,
1114 gettext_noop ("# connected addresses"),
1117 mq->specific_address->connected = GNUNET_NO;
1120 if (! mq->internal_msg)
1121 mq->specific_address->in_transmit = GNUNET_NO;
1123 if (mq->client != NULL)
1124 transmit_send_ok (mq->client, n, result);
1126 try_transmission_to_peer (n);
1131 * Find an address in any of the available transports for
1132 * the given neighbour that would be good for message
1133 * transmission. This is essentially the transport selection
1136 * @param neighbour for whom to select an address
1137 * @return selected address, NULL if we have none
1139 struct ForeignAddressList *
1140 find_ready_address(struct NeighbourList *neighbour)
1142 struct ReadyList *head = neighbour->plugins;
1143 struct ForeignAddressList *addresses;
1144 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1145 struct ForeignAddressList *best_address;
1147 best_address = NULL;
1148 while (head != NULL)
1150 addresses = head->addresses;
1151 while (addresses != NULL)
1153 if ( (addresses->timeout.value < now.value) &&
1154 (addresses->connected == GNUNET_YES) )
1157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1158 "Marking long-time inactive connection to `%4s' as down.\n",
1159 GNUNET_i2s (&neighbour->id));
1161 GNUNET_STATISTICS_update (stats,
1162 gettext_noop ("# connected addresses"),
1165 addresses->connected = GNUNET_NO;
1167 addresses = addresses->next;
1170 addresses = head->addresses;
1171 while (addresses != NULL)
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1175 GNUNET_a2s (addresses->addr,
1176 addresses->addrlen),
1177 GNUNET_i2s (&neighbour->id),
1178 addresses->connected,
1179 addresses->in_transmit,
1180 addresses->validated,
1181 addresses->connect_attempts,
1182 (unsigned long long) addresses->timeout.value,
1183 (unsigned int) addresses->distance);
1184 if ( ( (best_address == NULL) ||
1185 (addresses->connected == GNUNET_YES) ||
1186 (best_address->connected == GNUNET_NO) ) &&
1187 (addresses->in_transmit == GNUNET_NO) &&
1188 ( (best_address == NULL) ||
1189 (addresses->latency.value < best_address->latency.value)) )
1190 best_address = addresses;
1191 /* FIXME: also give lower-latency addresses that are not
1192 connected a chance some times... */
1193 addresses = addresses->next;
1197 if (best_address != NULL)
1200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1201 "Best address found has latency of %llu ms.\n",
1202 best_address->latency.value);
1207 GNUNET_STATISTICS_update (stats,
1208 gettext_noop ("# transmission attempts failed (no address)"),
1212 return best_address;
1218 * We should re-try transmitting to the given peer,
1219 * hopefully we've learned something in the meantime.
1222 retry_transmission_task (void *cls,
1223 const struct GNUNET_SCHEDULER_TaskContext *tc)
1225 struct NeighbourList *n = cls;
1227 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1228 try_transmission_to_peer (n);
1233 * Check the ready list for the given neighbour and if a plugin is
1234 * ready for transmission (and if we have a message), do so!
1236 * @param neighbour target peer for which to transmit
1239 try_transmission_to_peer (struct NeighbourList *neighbour)
1241 struct ReadyList *rl;
1242 struct MessageQueue *mq;
1243 struct GNUNET_TIME_Relative timeout;
1246 if (neighbour->messages_head == NULL)
1248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1249 "Transmission queue for `%4s' is empty\n",
1250 GNUNET_i2s (&neighbour->id));
1251 return; /* nothing to do */
1254 mq = neighbour->messages_head;
1255 /* FIXME: support bi-directional use of TCP */
1256 if (mq->specific_address == NULL)
1258 mq->specific_address = find_ready_address(neighbour);
1259 GNUNET_STATISTICS_update (stats,
1260 gettext_noop ("# transport selected peer address freely"),
1264 if (mq->specific_address == NULL)
1266 GNUNET_STATISTICS_update (stats,
1267 gettext_noop ("# transport failed to selected peer address"),
1270 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1271 if (timeout.value == 0)
1274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1275 "No destination address available to transmit message of size %u to peer `%4s'\n",
1276 mq->message_buf_size,
1277 GNUNET_i2s (&mq->neighbour_id));
1279 GNUNET_STATISTICS_update (stats,
1280 gettext_noop ("# bytes in message queue for other peers"),
1281 -mq->message_buf_size,
1283 GNUNET_STATISTICS_update (stats,
1284 gettext_noop ("# bytes discarded (no destination address available)"),
1285 mq->message_buf_size,
1287 if (mq->client != NULL)
1288 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1289 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1290 neighbour->messages_tail,
1293 return; /* nobody ready */
1295 GNUNET_STATISTICS_update (stats,
1296 gettext_noop ("# message delivery deferred (no address)"),
1299 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1300 GNUNET_SCHEDULER_cancel (sched,
1301 neighbour->retry_task);
1302 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1304 &retry_transmission_task,
1307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1308 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1309 mq->message_buf_size,
1310 GNUNET_i2s (&mq->neighbour_id),
1313 /* FIXME: might want to trigger peerinfo lookup here
1314 (unless that's already pending...) */
1317 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1318 neighbour->messages_tail,
1320 if (mq->specific_address->connected == GNUNET_NO)
1321 mq->specific_address->connect_attempts++;
1322 rl = mq->specific_address->ready_list;
1323 mq->plugin = rl->plugin;
1324 if (!mq->internal_msg)
1325 mq->specific_address->in_transmit = GNUNET_YES;
1327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1328 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1329 mq->message_buf_size,
1330 GNUNET_i2s (&neighbour->id),
1331 GNUNET_a2s (mq->specific_address->addr,
1332 mq->specific_address->addrlen),
1333 rl->plugin->short_name);
1335 GNUNET_STATISTICS_update (stats,
1336 gettext_noop ("# bytes in message queue for other peers"),
1337 -mq->message_buf_size,
1339 GNUNET_STATISTICS_update (stats,
1340 gettext_noop ("# bytes pending with plugins"),
1341 mq->message_buf_size,
1343 ret = rl->plugin->api->send (rl->plugin->api->cls,
1346 mq->message_buf_size,
1348 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1349 mq->specific_address->addr,
1350 mq->specific_address->addrlen,
1351 GNUNET_YES /* FIXME: sometimes, we want to be more tolerant here! */,
1352 &transmit_send_continuation, mq);
1355 /* failure, but 'send' would not call continuation in this case,
1356 so we need to do it here! */
1357 transmit_send_continuation (mq,
1365 * Send the specified message to the specified peer.
1367 * @param client source of the transmission request (can be NULL)
1368 * @param peer_address ForeignAddressList where we should send this message
1369 * @param priority how important is the message
1370 * @param timeout how long do we have to transmit?
1371 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1372 * @param message_buf_size total size of all messages in message_buf
1373 * @param is_internal is this an internal message; these are pre-pended and
1374 * also do not count for plugins being "ready" to transmit
1375 * @param neighbour handle to the neighbour for transmission
1378 transmit_to_peer (struct TransportClient *client,
1379 struct ForeignAddressList *peer_address,
1380 unsigned int priority,
1381 struct GNUNET_TIME_Relative timeout,
1382 const char *message_buf,
1383 size_t message_buf_size,
1384 int is_internal, struct NeighbourList *neighbour)
1386 struct MessageQueue *mq;
1391 /* check for duplicate submission */
1392 mq = neighbour->messages_head;
1395 if (mq->client == client)
1397 /* client transmitted to same peer twice
1398 before getting SEND_OK! */
1406 GNUNET_STATISTICS_update (stats,
1407 gettext_noop ("# bytes in message queue for other peers"),
1410 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1411 mq->specific_address = peer_address;
1412 mq->client = client;
1413 memcpy (&mq[1], message_buf, message_buf_size);
1414 mq->message_buf = (const char*) &mq[1];
1415 mq->message_buf_size = message_buf_size;
1416 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1417 mq->internal_msg = is_internal;
1418 mq->priority = priority;
1419 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1421 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1422 neighbour->messages_tail,
1425 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1426 neighbour->messages_tail,
1427 neighbour->messages_tail,
1429 try_transmission_to_peer (neighbour);
1436 struct GeneratorContext
1438 struct TransportPlugin *plug_pos;
1439 struct OwnAddressList *addr_pos;
1440 struct GNUNET_TIME_Absolute expiration;
1448 address_generator (void *cls, size_t max, void *buf)
1450 struct GeneratorContext *gc = cls;
1453 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1455 gc->plug_pos = gc->plug_pos->next;
1456 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1458 if (NULL == gc->plug_pos)
1463 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1466 gc->addr_pos->addrlen, buf, max);
1467 gc->addr_pos = gc->addr_pos->next;
1473 * Construct our HELLO message from all of the addresses of
1474 * all of the transports.
1479 struct GNUNET_HELLO_Message *hello;
1480 struct TransportClient *cpos;
1481 struct NeighbourList *npos;
1482 struct GeneratorContext gc;
1484 gc.plug_pos = plugins;
1485 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1486 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1487 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1490 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1492 GNUNET_STATISTICS_update (stats,
1493 gettext_noop ("# refreshed my HELLO"),
1497 while (cpos != NULL)
1499 transmit_to_client (cpos,
1500 (const struct GNUNET_MessageHeader *) hello,
1505 GNUNET_free_non_null (our_hello);
1507 our_hello_version++;
1508 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1510 while (npos != NULL)
1513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1514 "Transmitting updated `%s' to neighbour `%4s'\n",
1515 "HELLO", GNUNET_i2s (&npos->id));
1517 GNUNET_STATISTICS_update (stats,
1518 gettext_noop ("# transmitted my HELLO to other peers"),
1521 transmit_to_peer (NULL, NULL, 0,
1522 HELLO_ADDRESS_EXPIRATION,
1523 (const char *) our_hello,
1524 GNUNET_HELLO_size(our_hello),
1532 * Task used to clean up expired addresses for a plugin.
1534 * @param cls closure
1538 expire_address_task (void *cls,
1539 const struct GNUNET_SCHEDULER_TaskContext *tc);
1543 * Update the list of addresses for this plugin,
1544 * expiring those that are past their expiration date.
1546 * @param plugin addresses of which plugin should be recomputed?
1547 * @param fresh set to GNUNET_YES if a new address was added
1548 * and we need to regenerate the HELLO even if nobody
1552 update_addresses (struct TransportPlugin *plugin, int fresh)
1554 struct GNUNET_TIME_Relative min_remaining;
1555 struct GNUNET_TIME_Relative remaining;
1556 struct GNUNET_TIME_Absolute now;
1557 struct OwnAddressList *pos;
1558 struct OwnAddressList *prev;
1559 struct OwnAddressList *next;
1562 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1563 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1564 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1565 now = GNUNET_TIME_absolute_get ();
1566 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1567 expired = GNUNET_NO;
1569 pos = plugin->addresses;
1573 if (pos->expires.value < now.value)
1575 expired = GNUNET_YES;
1577 plugin->addresses = pos->next;
1579 prev->next = pos->next;
1586 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1587 if (remaining.value < min_remaining.value)
1588 min_remaining = remaining;
1594 if (expired || fresh)
1596 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1597 plugin->address_update_task
1598 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1600 &expire_address_task, plugin);
1606 * Task used to clean up expired addresses for a plugin.
1608 * @param cls closure
1612 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1614 struct TransportPlugin *plugin = cls;
1615 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1616 update_addresses (plugin, GNUNET_NO);
1621 * Function that must be called by each plugin to notify the
1622 * transport service about the addresses under which the transport
1623 * provided by the plugin can be reached.
1625 * @param cls closure
1626 * @param name name of the transport that generated the address
1627 * @param addr one of the addresses of the host, NULL for the last address
1628 * the specific address format depends on the transport
1629 * @param addrlen length of the address
1630 * @param expires when should this address automatically expire?
1633 plugin_env_notify_address (void *cls,
1637 struct GNUNET_TIME_Relative expires)
1639 struct TransportPlugin *p = cls;
1640 struct OwnAddressList *al;
1641 struct GNUNET_TIME_Absolute abex;
1643 abex = GNUNET_TIME_relative_to_absolute (expires);
1644 GNUNET_assert (p == find_transport (name));
1649 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1651 if (al->expires.value < abex.value)
1658 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
1660 al->next = p->addresses;
1663 al->addrlen = addrlen;
1664 memcpy (&al[1], addr, addrlen);
1665 update_addresses (p, GNUNET_YES);
1670 * Notify all of our clients about a peer connecting.
1673 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1674 struct GNUNET_TIME_Relative latency,
1677 struct ConnectInfoMessage cim;
1678 struct TransportClient *cpos;
1681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1682 "Notifying clients about connection from `%s'\n",
1685 GNUNET_STATISTICS_update (stats,
1686 gettext_noop ("# peers connected"),
1689 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1690 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1691 cim.distance = htonl (distance);
1692 cim.latency = GNUNET_TIME_relative_hton (latency);
1693 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1695 while (cpos != NULL)
1697 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1704 * Notify all of our clients about a peer disconnecting.
1707 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1709 struct DisconnectInfoMessage dim;
1710 struct TransportClient *cpos;
1713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1714 "Notifying clients about lost connection to `%s'\n",
1717 GNUNET_STATISTICS_update (stats,
1718 gettext_noop ("# peers connected"),
1721 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1722 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1723 dim.reserved = htonl (0);
1724 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1726 while (cpos != NULL)
1728 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1735 * Find a ForeignAddressList entry for the given neighbour
1736 * that matches the given address and transport.
1738 * @param neighbour which peer we care about
1739 * @param tname name of the transport plugin
1740 * @param addr binary address
1741 * @param addrlen length of addr
1742 * @return NULL if no such entry exists
1744 static struct ForeignAddressList *
1745 find_peer_address(struct NeighbourList *neighbour,
1750 struct ReadyList *head;
1751 struct ForeignAddressList *address_head;
1753 head = neighbour->plugins;
1754 while (head != NULL)
1756 if (0 == strcmp (tname, head->plugin->short_name))
1763 address_head = head->addresses;
1764 while ( (address_head != NULL) &&
1765 ( (address_head->addrlen != addrlen) ||
1766 (memcmp(address_head->addr, addr, addrlen) != 0) ) )
1767 address_head = address_head->next;
1768 return address_head;
1773 * Get the peer address struct for the given neighbour and
1774 * address. If it doesn't yet exist, create it.
1776 * @param neighbour which peer we care about
1777 * @param tname name of the transport plugin
1778 * @param addr binary address
1779 * @param addrlen length of addr
1780 * @return NULL if we do not have a transport plugin for 'tname'
1782 static struct ForeignAddressList *
1783 add_peer_address (struct NeighbourList *neighbour,
1788 struct ReadyList *head;
1789 struct ForeignAddressList *ret;
1791 ret = find_peer_address (neighbour, tname, addr, addrlen);
1794 head = neighbour->plugins;
1795 while (head != NULL)
1797 if (0 == strcmp (tname, head->plugin->short_name))
1803 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
1804 ret->addr = (const char*) &ret[1];
1805 memcpy (&ret[1], addr, addrlen);
1806 ret->addrlen = addrlen;
1807 ret->expires = GNUNET_TIME_relative_to_absolute
1808 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1809 ret->latency = GNUNET_TIME_relative_get_forever();
1811 ret->timeout = GNUNET_TIME_relative_to_absolute
1812 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1813 ret->ready_list = head;
1814 ret->next = head->addresses;
1815 head->addresses = ret;
1821 * Closure for 'add_validated_address'.
1823 struct AddValidatedAddressContext
1826 * Entry that has been validated.
1828 const struct ValidationEntry *ve;
1831 * Flag set after we have added the address so
1832 * that we terminate the iteration next time.
1839 * Callback function used to fill a buffer of max bytes with a list of
1840 * addresses in the format used by HELLOs. Should use
1841 * "GNUNET_HELLO_add_address" as a helper function.
1843 * @param cls the 'struct AddValidatedAddressContext' with the validated address
1844 * @param max maximum number of bytes that can be written to buf
1845 * @param buf where to write the address information
1846 * @return number of bytes written, 0 to signal the
1847 * end of the iteration.
1850 add_validated_address (void *cls,
1851 size_t max, void *buf)
1853 struct AddValidatedAddressContext *avac = cls;
1854 const struct ValidationEntry *ve = avac->ve;
1856 if (GNUNET_YES == avac->done)
1858 avac->done = GNUNET_YES;
1859 return GNUNET_HELLO_add_address (ve->transport_name,
1860 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
1870 * Closure for 'check_address_exists'.
1872 struct CheckAddressExistsClosure
1875 * Address to check for.
1880 * Name of the transport.
1890 * Set to GNUNET_YES if the address exists.
1897 * Iterator over hash map entries. Checks if the given
1898 * validation entry is for the same address as what is given
1901 * @param cls the 'struct CheckAddressExistsClosure*'
1902 * @param key current key code (ignored)
1903 * @param value value in the hash map ('struct ValidationEntry')
1904 * @return GNUNET_YES if we should continue to
1905 * iterate (mismatch), GNUNET_NO if not (entry matched)
1908 check_address_exists (void *cls,
1909 const GNUNET_HashCode * key,
1912 struct CheckAddressExistsClosure *caec = cls;
1913 struct ValidationEntry *ve = value;
1914 if ( (0 == strcmp (caec->tname,
1915 ve->transport_name)) &&
1916 (caec->addrlen == ve->addrlen) &&
1917 (0 == memcmp (caec->addr,
1921 caec->exists = GNUNET_YES;
1929 * HELLO validation cleanup task (validation failed).
1931 * @param cls the 'struct ValidationEntry' that failed
1932 * @param tc scheduler context (unused)
1935 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1937 struct ValidationEntry *va = cls;
1938 struct GNUNET_PeerIdentity pid;
1940 GNUNET_STATISTICS_update (stats,
1941 gettext_noop ("# address validation timeouts"),
1944 GNUNET_CRYPTO_hash (&va->publicKey,
1946 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1948 GNUNET_CONTAINER_multihashmap_remove (validation_map,
1951 GNUNET_free (va->transport_name);
1957 neighbour_timeout_task (void *cls,
1958 const struct GNUNET_SCHEDULER_TaskContext *tc)
1960 struct NeighbourList *n = cls;
1963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1964 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1966 GNUNET_STATISTICS_update (stats,
1967 gettext_noop ("# disconnects due to timeout"),
1970 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1971 disconnect_neighbour (n, GNUNET_NO);
1976 * Schedule the job that will cause us to send a PING to the
1977 * foreign address to evaluate its validity and latency.
1979 * @param fal address to PING
1982 schedule_next_ping (struct ForeignAddressList *fal);
1986 * Add the given address to the list of foreign addresses
1987 * available for the given peer (check for duplicates).
1989 * @param cls the respective 'struct NeighbourList' to update
1990 * @param tname name of the transport
1991 * @param expiration expiration time
1992 * @param addr the address
1993 * @param addrlen length of the address
1994 * @return GNUNET_OK (always)
1997 add_to_foreign_address_list (void *cls,
1999 struct GNUNET_TIME_Absolute expiration,
2000 const void *addr, size_t addrlen)
2002 struct NeighbourList *n = cls;
2003 struct ForeignAddressList *fal;
2006 GNUNET_STATISTICS_update (stats,
2007 gettext_noop ("# valid peer addresses returned by peerinfo"),
2011 fal = find_peer_address (n, tname, addr, addrlen);
2015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2016 "Adding address `%s' (%s) for peer `%4s' due to peerinfo data for %llums.\n",
2017 GNUNET_a2s (addr, addrlen),
2019 GNUNET_i2s (&n->id),
2022 fal = add_peer_address (n, tname, addr, addrlen);
2025 GNUNET_STATISTICS_update (stats,
2026 gettext_noop ("# previously validated addresses lacking transport"),
2032 fal->expires = GNUNET_TIME_absolute_max (expiration,
2034 schedule_next_ping (fal);
2040 fal->expires = GNUNET_TIME_absolute_max (expiration,
2045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2046 "Failed to add new address for `%4s'\n",
2047 GNUNET_i2s (&n->id));
2050 if (fal->validated == GNUNET_NO)
2052 fal->validated = GNUNET_YES;
2053 GNUNET_STATISTICS_update (stats,
2054 gettext_noop ("# peer addresses considered valid"),
2058 if (try == GNUNET_YES)
2060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2061 "Have new addresses, will try to trigger transmissions.\n");
2062 try_transmission_to_peer (n);
2069 * Add addresses in validated HELLO "h" to the set of addresses
2070 * we have for this peer.
2072 * @param cls closure ('struct NeighbourList*')
2073 * @param peer id of the peer, NULL for last call
2074 * @param h hello message for the peer (can be NULL)
2075 * @param trust amount of trust we have in the peer (not used)
2078 add_hello_for_peer (void *cls,
2079 const struct GNUNET_PeerIdentity *peer,
2080 const struct GNUNET_HELLO_Message *h,
2083 struct NeighbourList *n = cls;
2091 return; /* no HELLO available */
2093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2094 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2098 if (GNUNET_YES != n->public_key_valid)
2100 GNUNET_HELLO_get_key (h, &n->publicKey);
2101 n->public_key_valid = GNUNET_YES;
2103 GNUNET_HELLO_iterate_addresses (h,
2105 &add_to_foreign_address_list,
2111 * Create a fresh entry in our neighbour list for the given peer.
2112 * Will try to transmit our current HELLO to the new neighbour.
2114 * @param peer the peer for which we create the entry
2115 * @return the new neighbour list entry
2117 static struct NeighbourList *
2118 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer)
2120 struct NeighbourList *n;
2121 struct TransportPlugin *tp;
2122 struct ReadyList *rl;
2124 GNUNET_assert (our_hello != NULL);
2125 GNUNET_STATISTICS_update (stats,
2126 gettext_noop ("# active neighbours"),
2129 n = GNUNET_malloc (sizeof (struct NeighbourList));
2130 n->next = neighbours;
2134 GNUNET_TIME_relative_to_absolute
2135 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2136 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2137 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2138 MAX_BANDWIDTH_CARRY_S);
2142 if (tp->api->send != NULL)
2144 rl = GNUNET_malloc (sizeof (struct ReadyList));
2146 rl->next = n->plugins;
2149 rl->addresses = NULL;
2153 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2155 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2156 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2157 &neighbour_timeout_task, n);
2158 n->piter = GNUNET_PEERINFO_iterate (cfg, sched, peer,
2159 0, GNUNET_TIME_UNIT_FOREVER_REL,
2160 &add_hello_for_peer, n);
2161 transmit_to_peer (NULL, NULL, 0,
2162 HELLO_ADDRESS_EXPIRATION,
2163 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2170 * Send periodic PING messages to a give foreign address.
2172 * @param cls our 'struct PeriodicValidationContext*'
2173 * @param tc task context
2176 send_periodic_ping (void *cls,
2177 const struct GNUNET_SCHEDULER_TaskContext *tc)
2179 struct ForeignAddressList *peer_address = cls;
2180 struct TransportPlugin *tp;
2181 struct ValidationEntry *va;
2182 struct NeighbourList *neighbour;
2183 struct TransportPingMessage ping;
2184 struct CheckAddressExistsClosure caec;
2186 uint16_t hello_size;
2189 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2190 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2192 tp = peer_address->ready_list->plugin;
2193 neighbour = peer_address->ready_list->neighbour;
2194 if (GNUNET_YES != neighbour->public_key_valid)
2196 /* no public key yet, try again later */
2197 schedule_next_ping (peer_address);
2200 caec.addr = peer_address->addr;
2201 caec.addrlen = peer_address->addrlen;
2202 caec.tname = tp->short_name;
2203 caec.exists = GNUNET_NO;
2204 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2205 &check_address_exists,
2207 if (caec.exists == GNUNET_YES)
2209 /* During validation attempts we will likely trigger the other
2210 peer trying to validate our address which in turn will cause
2211 it to send us its HELLO, so we expect to hit this case rather
2212 frequently. Only print something if we are very verbose. */
2213 #if DEBUG_TRANSPORT > 1
2214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2215 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2216 GNUNET_a2s (peer_address->addr,
2217 peer_address->addrlen),
2219 GNUNET_i2s (&neighbour->id));
2221 schedule_next_ping (peer_address);
2224 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
2225 va->transport_name = GNUNET_strdup (tp->short_name);
2226 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2228 va->send_time = GNUNET_TIME_absolute_get();
2229 va->addr = (const void*) &va[1];
2230 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
2231 va->addrlen = peer_address->addrlen;
2233 memcpy(&va->publicKey,
2234 &neighbour->publicKey,
2235 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2237 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2238 HELLO_VERIFICATION_TIMEOUT,
2239 &timeout_hello_validation,
2241 GNUNET_CONTAINER_multihashmap_put (validation_map,
2242 &neighbour->id.hashPubKey,
2244 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2245 hello_size = GNUNET_HELLO_size(our_hello);
2246 tsize = sizeof(struct TransportPingMessage) + hello_size;
2247 message_buf = GNUNET_malloc(tsize);
2248 ping.challenge = htonl(va->challenge);
2249 ping.header.size = htons(sizeof(struct TransportPingMessage));
2250 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2251 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
2252 memcpy(message_buf, our_hello, hello_size);
2253 memcpy(&message_buf[hello_size],
2255 sizeof(struct TransportPingMessage));
2256 #if DEBUG_TRANSPORT_REVALIDATION
2257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2258 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2259 GNUNET_a2s (peer_address->addr,
2260 peer_address->addrlen),
2262 GNUNET_i2s (&neighbour->id),
2263 "HELLO", hello_size,
2264 "PING", sizeof (struct TransportPingMessage));
2266 GNUNET_STATISTICS_update (stats,
2267 gettext_noop ("# PING messages sent for re-validation"),
2270 transmit_to_peer (NULL, peer_address,
2271 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2272 HELLO_VERIFICATION_TIMEOUT,
2274 GNUNET_YES, neighbour);
2275 GNUNET_free(message_buf);
2276 schedule_next_ping (peer_address);
2281 * Schedule the job that will cause us to send a PING to the
2282 * foreign address to evaluate its validity and latency.
2284 * @param fal address to PING
2287 schedule_next_ping (struct ForeignAddressList *fal)
2289 struct GNUNET_TIME_Relative delay;
2291 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
2293 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
2294 delay.value /= 2; /* do before expiration */
2295 delay = GNUNET_TIME_relative_min (delay,
2296 LATENCY_EVALUATION_MAX_DELAY);
2297 if (GNUNET_YES != fal->estimated)
2299 delay = GNUNET_TIME_UNIT_ZERO;
2300 fal->estimated = GNUNET_YES;
2302 if (GNUNET_YES == fal->connected)
2304 delay = GNUNET_TIME_relative_min (delay,
2305 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
2307 /* FIXME: also adjust delay based on how close the last
2308 observed latency is to the latency of the best alternative */
2309 /* bound how fast we can go */
2310 delay = GNUNET_TIME_relative_max (delay,
2311 GNUNET_TIME_UNIT_SECONDS);
2312 /* randomize a bit (to avoid doing all at the same time) */
2313 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
2314 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
2316 &send_periodic_ping,
2322 * Iterator over hash map entries. Checks if the given validation
2323 * entry is for the same challenge as what is given in the PONG.
2325 * @param cls the 'struct TransportPongMessage*'
2326 * @param key peer identity
2327 * @param value value in the hash map ('struct ValidationEntry')
2328 * @return GNUNET_YES if we should continue to
2329 * iterate (mismatch), GNUNET_NO if not (entry matched)
2332 check_pending_validation (void *cls,
2333 const GNUNET_HashCode * key,
2336 const struct TransportPongMessage *pong = cls;
2337 struct ValidationEntry *ve = value;
2338 struct AddValidatedAddressContext avac;
2339 unsigned int challenge = ntohl(pong->challenge);
2340 struct GNUNET_HELLO_Message *hello;
2341 struct GNUNET_PeerIdentity target;
2342 struct NeighbourList *n;
2343 struct ForeignAddressList *fal;
2345 if (ve->challenge != challenge)
2349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2350 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
2352 GNUNET_a2s ((const struct sockaddr *) ve->addr,
2354 ve->transport_name);
2356 GNUNET_STATISTICS_update (stats,
2357 gettext_noop ("# address validation successes"),
2360 /* create the updated HELLO */
2361 GNUNET_CRYPTO_hash (&ve->publicKey,
2362 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2363 &target.hashPubKey);
2364 avac.done = GNUNET_NO;
2366 hello = GNUNET_HELLO_create (&ve->publicKey,
2367 &add_validated_address,
2369 GNUNET_PEERINFO_add_peer (cfg, sched,
2372 GNUNET_free (hello);
2373 n = find_neighbour (&target);
2376 n->publicKey = ve->publicKey;
2377 n->public_key_valid = GNUNET_YES;
2378 fal = add_peer_address (n,
2382 GNUNET_assert (fal != NULL);
2383 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
2384 fal->validated = GNUNET_YES;
2385 GNUNET_STATISTICS_update (stats,
2386 gettext_noop ("# peer addresses considered valid"),
2389 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
2390 schedule_next_ping (fal);
2391 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
2392 n->latency = fal->latency;
2394 n->latency.value = (fal->latency.value + n->latency.value) / 2;
2395 n->distance = fal->distance;
2396 if (GNUNET_NO == n->received_pong)
2398 notify_clients_connect (&target, n->latency, n->distance);
2399 n->received_pong = GNUNET_YES;
2401 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2403 GNUNET_SCHEDULER_cancel (sched,
2405 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2406 try_transmission_to_peer (n);
2410 /* clean up validation entry */
2411 GNUNET_assert (GNUNET_YES ==
2412 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2415 GNUNET_SCHEDULER_cancel (sched,
2417 GNUNET_free (ve->transport_name);
2424 * Function that will be called if we receive a validation
2425 * of an address challenge that we transmitted to another
2426 * peer. Note that the validation should only be considered
2427 * acceptable if the challenge matches AND if the sender
2428 * address is at least a plausible address for this peer
2429 * (otherwise we may be seeing a MiM attack).
2431 * @param cls closure
2432 * @param message the pong message
2433 * @param peer who responded to our challenge
2434 * @param sender_address string describing our sender address (as observed
2435 * by the other peer in binary format)
2436 * @param sender_address_len number of bytes in 'sender_address'
2439 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
2440 const struct GNUNET_PeerIdentity *peer,
2441 const char *sender_address,
2442 size_t sender_address_len)
2444 #if DEBUG_TRANSPORT > 1
2445 /* we get tons of these that just get discarded, only log
2446 if we are quite verbose */
2447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2448 "Receiving `%s' message from `%4s'.\n", "PONG",
2451 GNUNET_STATISTICS_update (stats,
2452 gettext_noop ("# PONG messages received"),
2455 if (GNUNET_SYSERR !=
2456 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
2458 &check_pending_validation,
2461 /* This is *expected* to happen a lot since we send
2462 PONGs to *all* known addresses of the sender of
2463 the PING, so most likely we get multiple PONGs
2464 per PING, and all but the first PONG will end up
2465 here. So really we should not print anything here
2466 unless we want to be very, very verbose... */
2467 #if DEBUG_TRANSPORT > 2
2468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2469 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
2478 /* FIXME: add given address to potential pool of our addresses
2480 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
2481 _("Another peer saw us using the address `%s' via `%s'.\n"),
2482 GNUNET_a2s ((const struct sockaddr *) &pong[1],
2483 ntohs(pong->addrlen)),
2484 va->transport_name);
2490 * Check if the given address is already being validated; if not,
2491 * append the given address to the list of entries that are being be
2492 * validated and initiate validation.
2494 * @param cls closure ('struct CheckHelloValidatedContext *')
2495 * @param tname name of the transport
2496 * @param expiration expiration time
2497 * @param addr the address
2498 * @param addrlen length of the address
2499 * @return GNUNET_OK (always)
2502 run_validation (void *cls,
2504 struct GNUNET_TIME_Absolute expiration,
2505 const void *addr, size_t addrlen)
2507 struct CheckHelloValidatedContext *chvc = cls;
2508 struct GNUNET_PeerIdentity id;
2509 struct TransportPlugin *tp;
2510 struct ValidationEntry *va;
2511 struct NeighbourList *neighbour;
2512 struct ForeignAddressList *peer_address;
2513 struct TransportPingMessage ping;
2514 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2515 struct CheckAddressExistsClosure caec;
2517 uint16_t hello_size;
2520 GNUNET_STATISTICS_update (stats,
2521 gettext_noop ("# peer addresses scheduled for validation"),
2524 tp = find_transport (tname);
2527 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2528 GNUNET_ERROR_TYPE_BULK,
2530 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2532 GNUNET_STATISTICS_update (stats,
2533 gettext_noop ("# peer addresses not validated (no applicable transport plugin available)"),
2538 GNUNET_HELLO_get_key (chvc->hello, &pk);
2539 GNUNET_CRYPTO_hash (&pk,
2541 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2544 caec.addrlen = addrlen;
2546 caec.exists = GNUNET_NO;
2547 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2548 &check_address_exists,
2550 if (caec.exists == GNUNET_YES)
2552 /* During validation attempts we will likely trigger the other
2553 peer trying to validate our address which in turn will cause
2554 it to send us its HELLO, so we expect to hit this case rather
2555 frequently. Only print something if we are very verbose. */
2556 #if DEBUG_TRANSPORT > 1
2557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2558 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2559 GNUNET_a2s (addr, addrlen),
2563 GNUNET_STATISTICS_update (stats,
2564 gettext_noop ("# peer addresses not validated (in progress)"),
2569 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2570 va->transport_name = GNUNET_strdup (tname);
2571 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2573 va->send_time = GNUNET_TIME_absolute_get();
2574 va->addr = (const void*) &va[1];
2575 memcpy (&va[1], addr, addrlen);
2576 va->addrlen = addrlen;
2577 GNUNET_HELLO_get_key (chvc->hello,
2579 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2580 HELLO_VERIFICATION_TIMEOUT,
2581 &timeout_hello_validation,
2583 GNUNET_CONTAINER_multihashmap_put (validation_map,
2586 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2587 neighbour = find_neighbour(&id);
2588 if (neighbour == NULL)
2589 neighbour = setup_new_neighbour(&id);
2590 neighbour->publicKey = va->publicKey;
2591 neighbour->public_key_valid = GNUNET_YES;
2592 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2593 GNUNET_assert(peer_address != NULL);
2594 hello_size = GNUNET_HELLO_size(our_hello);
2595 tsize = sizeof(struct TransportPingMessage) + hello_size;
2596 message_buf = GNUNET_malloc(tsize);
2597 ping.challenge = htonl(va->challenge);
2598 ping.header.size = htons(sizeof(struct TransportPingMessage));
2599 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2600 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2601 memcpy(message_buf, our_hello, hello_size);
2602 memcpy(&message_buf[hello_size],
2604 sizeof(struct TransportPingMessage));
2606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2607 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2608 GNUNET_a2s (addr, addrlen),
2611 "HELLO", hello_size,
2612 "PING", sizeof (struct TransportPingMessage));
2614 GNUNET_STATISTICS_update (stats,
2615 gettext_noop ("# PING messages sent for initial validation"),
2618 transmit_to_peer (NULL, peer_address,
2619 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2620 HELLO_VERIFICATION_TIMEOUT,
2622 GNUNET_YES, neighbour);
2623 GNUNET_free(message_buf);
2629 * Check if addresses in validated hello "h" overlap with
2630 * those in "chvc->hello" and validate the rest.
2632 * @param cls closure
2633 * @param peer id of the peer, NULL for last call
2634 * @param h hello message for the peer (can be NULL)
2635 * @param trust amount of trust we have in the peer (not used)
2638 check_hello_validated (void *cls,
2639 const struct GNUNET_PeerIdentity *peer,
2640 const struct GNUNET_HELLO_Message *h,
2643 struct CheckHelloValidatedContext *chvc = cls;
2644 struct GNUNET_HELLO_Message *plain_hello;
2645 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2646 struct GNUNET_PeerIdentity target;
2647 struct NeighbourList *n;
2652 GNUNET_CONTAINER_DLL_remove (chvc_head,
2655 if (GNUNET_NO == chvc->hello_known)
2657 /* notify PEERINFO about the peer now, so that we at least
2658 have the public key if some other component needs it */
2659 GNUNET_HELLO_get_key (chvc->hello, &pk);
2660 GNUNET_CRYPTO_hash (&pk,
2661 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2662 &target.hashPubKey);
2663 plain_hello = GNUNET_HELLO_create (&pk,
2666 GNUNET_PEERINFO_add_peer (cfg, sched, &target, plain_hello);
2667 GNUNET_free (plain_hello);
2669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2670 "Peerinfo had no `%s' message for peer `%4s', full validation needed.\n",
2672 GNUNET_i2s (&target));
2674 GNUNET_STATISTICS_update (stats,
2675 gettext_noop ("# new HELLOs requiring full validation"),
2678 GNUNET_HELLO_iterate_addresses (chvc->hello,
2685 GNUNET_STATISTICS_update (stats,
2686 gettext_noop ("# duplicate HELLO (peer known)"),
2696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2697 "Peerinfo had `%s' message for peer `%4s', validating only new addresses.\n",
2701 chvc->hello_known = GNUNET_YES;
2702 n = find_neighbour (peer);
2705 GNUNET_HELLO_iterate_addresses (h,
2707 &add_to_foreign_address_list,
2709 try_transmission_to_peer (n);
2713 GNUNET_STATISTICS_update (stats,
2714 gettext_noop ("# no existing neighbour record (validating HELLO)"),
2718 GNUNET_STATISTICS_update (stats,
2719 gettext_noop ("# HELLO validations (update case)"),
2722 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2724 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
2730 * Process HELLO-message.
2732 * @param plugin transport involved, may be NULL
2733 * @param message the actual message
2734 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2737 process_hello (struct TransportPlugin *plugin,
2738 const struct GNUNET_MessageHeader *message)
2741 struct GNUNET_PeerIdentity target;
2742 const struct GNUNET_HELLO_Message *hello;
2743 struct CheckHelloValidatedContext *chvc;
2744 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2746 hsize = ntohs (message->size);
2747 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2748 (hsize < sizeof (struct GNUNET_MessageHeader)))
2751 return GNUNET_SYSERR;
2753 GNUNET_STATISTICS_update (stats,
2754 gettext_noop ("# HELLOs received for validation"),
2757 /* first, check if load is too high */
2758 if (GNUNET_SCHEDULER_get_load (sched,
2759 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
2761 GNUNET_STATISTICS_update (stats,
2762 gettext_noop ("# HELLOs ignored due to high load"),
2767 hello = (const struct GNUNET_HELLO_Message *) message;
2768 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2770 GNUNET_break_op (0);
2771 return GNUNET_SYSERR;
2773 GNUNET_CRYPTO_hash (&publicKey,
2774 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2775 &target.hashPubKey);
2776 if (0 == memcmp (&my_identity,
2778 sizeof (struct GNUNET_PeerIdentity)))
2780 GNUNET_STATISTICS_update (stats,
2781 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
2786 #if DEBUG_TRANSPORT > 1
2787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2788 "Processing `%s' message for `%4s' of size %u\n",
2790 GNUNET_i2s (&target),
2791 GNUNET_HELLO_size(hello));
2793 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2794 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
2795 memcpy (&chvc[1], hello, hsize);
2796 GNUNET_CONTAINER_DLL_insert (chvc_head,
2799 /* finally, check if HELLO was previously validated
2800 (continuation will then schedule actual validation) */
2801 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2805 HELLO_VERIFICATION_TIMEOUT,
2806 &check_hello_validated, chvc);
2812 * The peer specified by the given neighbour has timed-out or a plugin
2813 * has disconnected. We may either need to do nothing (other plugins
2814 * still up), or trigger a full disconnect and clean up. This
2815 * function updates our state and does the necessary notifications.
2816 * Also notifies our clients that the neighbour is now officially
2819 * @param n the neighbour list entry for the peer
2820 * @param check should we just check if all plugins
2821 * disconnected or must we ask all plugins to
2825 disconnect_neighbour (struct NeighbourList *n, int check)
2827 struct ReadyList *rpos;
2828 struct NeighbourList *npos;
2829 struct NeighbourList *nprev;
2830 struct MessageQueue *mq;
2831 struct ForeignAddressList *peer_addresses;
2832 struct ForeignAddressList *peer_pos;
2834 if (GNUNET_YES == check)
2837 while (NULL != rpos)
2839 peer_addresses = rpos->addresses;
2840 while (peer_addresses != NULL)
2842 if (GNUNET_YES == peer_addresses->connected)
2843 return; /* still connected */
2844 peer_addresses = peer_addresses->next;
2850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2851 "Disconnecting from `%4s'\n",
2852 GNUNET_i2s (&n->id));
2854 /* remove n from neighbours list */
2857 while ((npos != NULL) && (npos != n))
2862 GNUNET_assert (npos != NULL);
2864 neighbours = n->next;
2866 nprev->next = n->next;
2868 /* notify all clients about disconnect */
2869 if (GNUNET_YES == n->received_pong)
2870 notify_clients_disconnect (&n->id);
2872 /* clean up all plugins, cancel connections and pending transmissions */
2873 while (NULL != (rpos = n->plugins))
2875 n->plugins = rpos->next;
2876 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
2877 while (rpos->addresses != NULL)
2879 peer_pos = rpos->addresses;
2880 rpos->addresses = peer_pos->next;
2881 if (peer_pos->connected == GNUNET_YES)
2882 GNUNET_STATISTICS_update (stats,
2883 gettext_noop ("# connected addresses"),
2886 if (GNUNET_YES == peer_pos->validated)
2887 GNUNET_STATISTICS_update (stats,
2888 gettext_noop ("# peer addresses considered valid"),
2891 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
2893 GNUNET_SCHEDULER_cancel (sched,
2894 peer_pos->revalidate_task);
2895 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2897 GNUNET_free(peer_pos);
2902 /* free all messages on the queue */
2903 while (NULL != (mq = n->messages_head))
2905 GNUNET_STATISTICS_update (stats,
2906 gettext_noop ("# bytes in message queue for other peers"),
2907 -mq->message_buf_size,
2909 GNUNET_STATISTICS_update (stats,
2910 gettext_noop ("# bytes discarded due to disconnect"),
2911 mq->message_buf_size,
2913 GNUNET_CONTAINER_DLL_remove (n->messages_head,
2916 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
2918 sizeof(struct GNUNET_PeerIdentity)));
2921 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2923 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2924 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2926 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2928 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
2929 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2931 if (n->piter != NULL)
2933 GNUNET_PEERINFO_iterate_cancel (n->piter);
2936 /* finally, free n itself */
2937 GNUNET_STATISTICS_update (stats,
2938 gettext_noop ("# active neighbours"),
2946 * We have received a PING message from someone. Need to send a PONG message
2947 * in response to the peer by any means necessary.
2949 * FIXME: With something like TCP where a connection exists, we may
2950 * want to send it that way. But the current API does not seem to
2951 * allow us to do so (can't tell this to the transport!)
2954 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2955 const struct GNUNET_PeerIdentity *peer,
2956 const char *sender_address,
2957 size_t sender_address_len)
2959 struct TransportPlugin *plugin = cls;
2960 struct TransportPingMessage *ping;
2961 struct TransportPongMessage *pong;
2962 struct NeighbourList *n;
2963 struct ReadyList *rl;
2964 struct ForeignAddressList *fal;
2966 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
2968 GNUNET_break_op (0);
2969 return GNUNET_SYSERR;
2971 ping = (struct TransportPingMessage *) message;
2972 if (0 != memcmp (&ping->target,
2973 plugin->env.my_identity,
2974 sizeof (struct GNUNET_PeerIdentity)))
2976 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2977 _("Received `%s' message not destined for me!\n"),
2979 return GNUNET_SYSERR;
2982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2983 "Processing `%s' from `%s'\n",
2985 GNUNET_a2s ((const struct sockaddr *)sender_address,
2986 sender_address_len));
2988 GNUNET_STATISTICS_update (stats,
2989 gettext_noop ("# PING messages received"),
2992 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2993 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2994 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2995 pong->purpose.size =
2996 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2998 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2999 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
3000 pong->challenge = ping->challenge;
3001 pong->addrlen = htons(sender_address_len);
3002 memcpy(&pong->signer,
3004 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3005 memcpy (&pong[1], sender_address, sender_address_len);
3006 GNUNET_assert (GNUNET_OK ==
3007 GNUNET_CRYPTO_rsa_sign (my_private_key,
3008 &pong->purpose, &pong->signature));
3010 n = find_neighbour(peer);
3012 n = setup_new_neighbour(peer);
3013 /* broadcast 'PONG' to all available addresses */
3017 fal = rl->addresses;
3020 transmit_to_peer(NULL, fal,
3021 TRANSPORT_PONG_PRIORITY,
3022 HELLO_VERIFICATION_TIMEOUT,
3024 ntohs(pong->header.size),
3037 * Function called by the plugin for each received message.
3038 * Update data volumes, possibly notify plugins about
3039 * reducing the rate at which they read from the socket
3040 * and generally forward to our receive callback.
3042 * @param cls the "struct TransportPlugin *" we gave to the plugin
3043 * @param peer (claimed) identity of the other peer
3044 * @param message the message, NULL if we only care about
3045 * learning about the delay until we should receive again
3046 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
3047 * @param sender_address binary address of the sender (if observed)
3048 * @param sender_address_len number of bytes in sender_address
3049 * @return how long the plugin should wait until receiving more data
3050 * (plugins that do not support this, can ignore the return value)
3052 static struct GNUNET_TIME_Relative
3053 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
3054 const struct GNUNET_MessageHeader *message,
3055 unsigned int distance, const char *sender_address,
3056 size_t sender_address_len)
3058 struct ReadyList *service_context;
3059 struct TransportPlugin *plugin = cls;
3060 struct TransportClient *cpos;
3061 struct InboundMessage *im;
3062 struct ForeignAddressList *peer_address;
3064 struct NeighbourList *n;
3065 struct GNUNET_TIME_Relative ret;
3067 n = find_neighbour (peer);
3069 n = setup_new_neighbour (peer);
3070 service_context = n->plugins;
3071 while ((service_context != NULL) && (plugin != service_context->plugin))
3072 service_context = service_context->next;
3073 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
3074 if (message != NULL)
3076 peer_address = add_peer_address(n,
3079 sender_address_len);
3080 if (peer_address != NULL)
3082 peer_address->distance = distance;
3083 if (peer_address->connected == GNUNET_NO)
3085 /* FIXME: be careful here to not mark
3086 MULTIPLE addresses as connected! */
3087 peer_address->connected = GNUNET_YES;
3088 GNUNET_STATISTICS_update (stats,
3089 gettext_noop ("# connected addresses"),
3093 peer_address->timeout
3095 GNUNET_TIME_relative_to_absolute
3096 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
3097 schedule_next_ping (peer_address);
3099 /* update traffic received amount ... */
3100 msize = ntohs (message->size);
3101 GNUNET_STATISTICS_update (stats,
3102 gettext_noop ("# bytes received from other peers"),
3105 n->distance = distance;
3107 GNUNET_TIME_relative_to_absolute
3108 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
3109 GNUNET_SCHEDULER_cancel (sched,
3112 GNUNET_SCHEDULER_add_delayed (sched,
3113 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3114 &neighbour_timeout_task, n);
3115 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
3117 /* dropping message due to frequent inbound volume violations! */
3118 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
3119 GNUNET_ERROR_TYPE_BULK,
3121 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
3122 n->in_tracker.available_bytes_per_s__,
3123 n->quota_violation_count);
3124 GNUNET_STATISTICS_update (stats,
3125 gettext_noop ("# bandwidth quota violations by other peers"),
3128 return GNUNET_TIME_UNIT_MINUTES; /* minimum penalty, likely ignored (UDP...) */
3130 switch (ntohs (message->type))
3132 case GNUNET_MESSAGE_TYPE_HELLO:
3133 GNUNET_STATISTICS_update (stats,
3134 gettext_noop ("# HELLO messages received from other peers"),
3137 process_hello (plugin, message);
3139 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
3140 handle_ping(plugin, message, peer, sender_address, sender_address_len);
3142 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
3143 handle_pong(plugin, message, peer, sender_address, sender_address_len);
3147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3148 "Received message of type %u from `%4s', sending to all clients.\n",
3149 ntohs (message->type), GNUNET_i2s (peer));
3151 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3153 n->quota_violation_count++;
3155 n->quota_violation_count = 0; /* back within limits */
3156 GNUNET_STATISTICS_update (stats,
3157 gettext_noop ("# payload received from other peers"),
3160 /* transmit message to all clients */
3161 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3162 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3163 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3164 im->latency = GNUNET_TIME_relative_hton (n->latency);
3166 memcpy (&im[1], message, msize);
3168 while (cpos != NULL)
3170 transmit_to_client (cpos, &im->header, GNUNET_YES);
3176 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
3179 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3180 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
3181 (unsigned long long) n->in_tracker.consumption_since_last_update__,
3182 (unsigned int) n->in_tracker.available_bytes_per_s__,
3183 (unsigned long long) ret.value);
3184 GNUNET_STATISTICS_update (stats,
3185 gettext_noop ("# ms throttling suggested"),
3186 (int64_t) ret.value,
3194 * Handle START-message. This is the first message sent to us
3195 * by any client which causes us to add it to our list.
3197 * @param cls closure (always NULL)
3198 * @param client identification of the client
3199 * @param message the actual message
3202 handle_start (void *cls,
3203 struct GNUNET_SERVER_Client *client,
3204 const struct GNUNET_MessageHeader *message)
3206 struct TransportClient *c;
3207 struct ConnectInfoMessage cim;
3208 struct NeighbourList *n;
3211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3212 "Received `%s' request from client\n", "START");
3217 if (c->client == client)
3219 /* client already on our list! */
3221 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3226 c = GNUNET_malloc (sizeof (struct TransportClient));
3230 if (our_hello != NULL)
3233 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3234 "Sending our own `%s' to new client\n", "HELLO");
3236 transmit_to_client (c,
3237 (const struct GNUNET_MessageHeader *) our_hello,
3239 /* tell new client about all existing connections */
3240 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
3241 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
3245 if (GNUNET_YES == n->received_pong)
3248 cim.latency = GNUNET_TIME_relative_hton (n->latency);
3249 cim.distance = htonl (n->distance);
3250 transmit_to_client (c, &cim.header, GNUNET_NO);
3255 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3260 * Handle HELLO-message.
3262 * @param cls closure (always NULL)
3263 * @param client identification of the client
3264 * @param message the actual message
3267 handle_hello (void *cls,
3268 struct GNUNET_SERVER_Client *client,
3269 const struct GNUNET_MessageHeader *message)
3273 GNUNET_STATISTICS_update (stats,
3274 gettext_noop ("# HELLOs received from clients"),
3277 ret = process_hello (NULL, message);
3278 GNUNET_SERVER_receive_done (client, ret);
3283 * Handle SEND-message.
3285 * @param cls closure (always NULL)
3286 * @param client identification of the client
3287 * @param message the actual message
3290 handle_send (void *cls,
3291 struct GNUNET_SERVER_Client *client,
3292 const struct GNUNET_MessageHeader *message)
3294 struct TransportClient *tc;
3295 struct NeighbourList *n;
3296 const struct OutboundMessage *obm;
3297 const struct GNUNET_MessageHeader *obmm;
3301 size = ntohs (message->size);
3303 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
3306 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3309 GNUNET_STATISTICS_update (stats,
3310 gettext_noop ("# payload received for other peers"),
3313 obm = (const struct OutboundMessage *) message;
3315 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3316 "Received `%s' request from client with target `%4s'\n",
3317 "SEND", GNUNET_i2s (&obm->peer));
3319 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
3320 msize = ntohs (obmm->size);
3321 if (size != msize + sizeof (struct OutboundMessage))
3324 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3327 n = find_neighbour (&obm->peer);
3329 n = setup_new_neighbour (&obm->peer);
3331 while ((tc != NULL) && (tc->client != client))
3335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3336 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
3338 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
3340 transmit_to_peer (tc, NULL, ntohl (obm->priority),
3341 GNUNET_TIME_relative_ntoh (obm->timeout),
3343 ntohs (obmm->size), GNUNET_NO, n);
3344 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3349 * Handle SET_QUOTA-message.
3351 * @param cls closure (always NULL)
3352 * @param client identification of the client
3353 * @param message the actual message
3356 handle_set_quota (void *cls,
3357 struct GNUNET_SERVER_Client *client,
3358 const struct GNUNET_MessageHeader *message)
3360 const struct QuotaSetMessage *qsm =
3361 (const struct QuotaSetMessage *) message;
3362 struct NeighbourList *n;
3364 GNUNET_STATISTICS_update (stats,
3365 gettext_noop ("# SET QUOTA messages received"),
3368 n = find_neighbour (&qsm->peer);
3371 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3372 GNUNET_STATISTICS_update (stats,
3373 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
3379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3380 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
3382 (unsigned int) ntohl (qsm->quota.value__),
3383 (unsigned int) n->in_tracker.available_bytes_per_s__,
3384 GNUNET_i2s (&qsm->peer));
3386 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
3388 if (0 == ntohl (qsm->quota.value__))
3389 disconnect_neighbour (n, GNUNET_NO);
3390 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3395 * Take the given address and append it to the set of results send back to
3398 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
3399 * @param address the resolved name, NULL to indicate the last response
3402 transmit_address_to_client (void *cls, const char *address)
3404 struct GNUNET_SERVER_TransmitContext *tc = cls;
3407 if (NULL == address)
3410 slen = strlen (address) + 1;
3411 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
3412 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3413 if (NULL == address)
3414 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
3419 * Handle AddressLookup-message.
3421 * @param cls closure (always NULL)
3422 * @param client identification of the client
3423 * @param message the actual message
3426 handle_address_lookup (void *cls,
3427 struct GNUNET_SERVER_Client *client,
3428 const struct GNUNET_MessageHeader *message)
3430 const struct AddressLookupMessage *alum;
3431 struct TransportPlugin *lsPlugin;
3432 const char *nameTransport;
3433 const char *address;
3435 struct GNUNET_SERVER_TransmitContext *tc;
3436 struct GNUNET_TIME_Absolute timeout;
3437 struct GNUNET_TIME_Relative rtimeout;
3440 size = ntohs (message->size);
3441 if (size < sizeof (struct AddressLookupMessage))
3443 GNUNET_break_op (0);
3444 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3447 alum = (const struct AddressLookupMessage *) message;
3448 uint32_t addressLen = ntohl (alum->addrlen);
3449 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
3451 GNUNET_break_op (0);
3452 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3455 address = (const char *) &alum[1];
3456 nameTransport = (const char *) &address[addressLen];
3458 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
3460 GNUNET_break_op (0);
3461 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3464 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
3465 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
3466 numeric = ntohl (alum->numeric_only);
3467 lsPlugin = find_transport (nameTransport);
3468 if (NULL == lsPlugin)
3470 tc = GNUNET_SERVER_transmit_context_create (client);
3471 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
3472 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3473 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
3476 tc = GNUNET_SERVER_transmit_context_create (client);
3477 lsPlugin->api->address_pretty_printer (cls, nameTransport,
3478 address, addressLen,
3481 &transmit_address_to_client, tc);
3485 * List of handlers for the messages understood by this
3488 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3489 {&handle_start, NULL,
3490 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
3491 {&handle_hello, NULL,
3492 GNUNET_MESSAGE_TYPE_HELLO, 0},
3493 {&handle_send, NULL,
3494 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
3495 {&handle_set_quota, NULL,
3496 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
3497 {&handle_address_lookup, NULL,
3498 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
3505 * Setup the environment for this plugin.
3508 create_environment (struct TransportPlugin *plug)
3510 plug->env.cfg = cfg;
3511 plug->env.sched = sched;
3512 plug->env.my_identity = &my_identity;
3513 plug->env.cls = plug;
3514 plug->env.receive = &plugin_env_receive;
3515 plug->env.notify_address = &plugin_env_notify_address;
3516 plug->env.max_connections = max_connect_per_transport;
3517 plug->env.stats = stats;
3522 * Start the specified transport (load the plugin).
3525 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
3527 struct TransportPlugin *plug;
3530 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3531 _("Loading `%s' transport plugin\n"), name);
3532 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
3533 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
3534 create_environment (plug);
3535 plug->short_name = GNUNET_strdup (name);
3536 plug->lib_name = libname;
3537 plug->next = plugins;
3539 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
3540 if (plug->api == NULL)
3542 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3543 _("Failed to load transport plugin for `%s'\n"), name);
3544 GNUNET_free (plug->short_name);
3545 plugins = plug->next;
3546 GNUNET_free (libname);
3553 * Called whenever a client is disconnected. Frees our
3554 * resources associated with that client.
3556 * @param cls closure
3557 * @param client identification of the client
3560 client_disconnect_notification (void *cls,
3561 struct GNUNET_SERVER_Client *client)
3563 struct TransportClient *pos;
3564 struct TransportClient *prev;
3565 struct ClientMessageQueueEntry *mqe;
3570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3571 "Client disconnected, cleaning up.\n");
3575 while ((pos != NULL) && (pos->client != client))
3582 while (NULL != (mqe = pos->message_queue_head))
3584 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
3585 pos->message_queue_tail,
3587 pos->message_count--;
3591 clients = pos->next;
3593 prev->next = pos->next;
3594 if (GNUNET_YES == pos->tcs_pending)
3599 if (pos->th != NULL)
3601 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
3604 GNUNET_break (0 == pos->message_count);
3610 * Iterator to free entries in the validation_map.
3612 * @param cls closure (unused)
3613 * @param key current key code
3614 * @param value value in the hash map (validation to abort)
3615 * @return GNUNET_YES (always)
3618 abort_validation (void *cls,
3619 const GNUNET_HashCode * key,
3622 struct ValidationEntry *va = value;
3624 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
3625 GNUNET_free (va->transport_name);
3632 * Function called when the service shuts down. Unloads our plugins
3633 * and cancels pending validations.
3635 * @param cls closure, unused
3636 * @param tc task context (unused)
3639 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3641 struct TransportPlugin *plug;
3642 struct OwnAddressList *al;
3643 struct CheckHelloValidatedContext *chvc;
3645 while (neighbours != NULL)
3646 disconnect_neighbour (neighbours, GNUNET_NO);
3648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3649 "Transport service is unloading plugins...\n");
3651 while (NULL != (plug = plugins))
3653 plugins = plug->next;
3654 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3655 GNUNET_free (plug->lib_name);
3656 GNUNET_free (plug->short_name);
3657 while (NULL != (al = plug->addresses))
3659 plug->addresses = al->next;
3664 if (my_private_key != NULL)
3665 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3666 GNUNET_free_non_null (our_hello);
3668 /* free 'chvc' data structure */
3669 while (NULL != (chvc = chvc_head))
3671 chvc_head = chvc->next;
3672 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
3677 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3680 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3681 validation_map = NULL;
3684 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3691 * Initiate transport service.
3693 * @param cls closure
3694 * @param s scheduler to use
3695 * @param serv the initialized server
3696 * @param c configuration to use
3700 struct GNUNET_SCHEDULER_Handle *s,
3701 struct GNUNET_SERVER_Handle *serv,
3702 const struct GNUNET_CONFIGURATION_Handle *c)
3707 unsigned long long tneigh;
3712 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
3713 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
3714 /* parse configuration */
3716 GNUNET_CONFIGURATION_get_value_number (c,
3721 GNUNET_CONFIGURATION_get_value_filename (c,
3723 "HOSTKEY", &keyfile)))
3725 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3727 ("Transport service is lacking key configuration settings. Exiting.\n"));
3728 GNUNET_SCHEDULER_shutdown (s);
3731 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3734 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3735 validation_map = NULL;
3738 max_connect_per_transport = (uint32_t) tneigh;
3739 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3740 GNUNET_free (keyfile);
3741 if (my_private_key == NULL)
3743 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3745 ("Transport service could not access hostkey. Exiting.\n"));
3746 GNUNET_SCHEDULER_shutdown (s);
3749 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3752 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3753 validation_map = NULL;
3756 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3757 GNUNET_CRYPTO_hash (&my_public_key,
3758 sizeof (my_public_key), &my_identity.hashPubKey);
3759 /* setup notification */
3761 GNUNET_SERVER_disconnect_notify (server,
3762 &client_disconnect_notification, NULL);
3763 /* load plugins... */
3766 GNUNET_CONFIGURATION_get_value_string (c,
3767 "TRANSPORT", "PLUGINS", &plugs))
3769 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3770 _("Starting transport plugins `%s'\n"), plugs);
3771 pos = strtok (plugs, " ");
3774 start_transport (server, pos);
3776 pos = strtok (NULL, " ");
3778 GNUNET_free (plugs);
3780 GNUNET_SCHEDULER_add_delayed (sched,
3781 GNUNET_TIME_UNIT_FOREVER_REL,
3782 &shutdown_task, NULL);
3787 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3789 /* process client requests */
3790 GNUNET_SERVER_add_handlers (server, handlers);
3795 * The main function for the transport service.
3797 * @param argc number of arguments from the command line
3798 * @param argv command line arguments
3799 * @return 0 ok, 1 on error
3802 main (int argc, char *const *argv)
3804 return (GNUNET_OK ==
3805 GNUNET_SERVICE_run (argc,
3808 GNUNET_SERVICE_OPTION_NONE,
3809 &run, NULL)) ? 0 : 1;
3812 /* end of gnunet-service-transport.c */