2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
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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 * - if we do not receive an ACK in response to our
28 * HELLO, retransmit HELLO!
31 #include "gnunet_client_lib.h"
32 #include "gnunet_getopt_lib.h"
33 #include "gnunet_hello_lib.h"
34 #include "gnunet_os_lib.h"
35 #include "gnunet_peerinfo_service.h"
36 #include "gnunet_plugin_lib.h"
37 #include "gnunet_protocols.h"
38 #include "gnunet_service_lib.h"
39 #include "gnunet_signatures.h"
40 #include "plugin_transport.h"
41 #include "transport.h"
44 * How many messages can we have pending for a given client process
45 * before we start to drop incoming messages? We typically should
46 * have only one client and so this would be the primary buffer for
47 * messages, so the number should be chosen rather generously.
49 * The expectation here is that most of the time the queue is large
50 * enough so that a drop is virtually never required.
52 #define MAX_PENDING 128
55 * How often should we try to reconnect to a peer using a particular
56 * transport plugin before giving up? Note that the plugin may be
57 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
59 #define MAX_CONNECT_RETRY 3
62 * How often must a peer violate bandwidth quotas before we start
63 * to simply drop its messages?
65 #define QUOTA_VIOLATION_DROP_THRESHOLD 100
68 * How long until a HELLO verification attempt should time out?
70 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_UNIT_MINUTES
73 * How often do we re-add (cheaper) plugins to our list of plugins
74 * to try for a given connected peer?
76 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
79 * After how long do we expire an address in a HELLO
80 * that we just validated? This value is also used
81 * for our own addresses when we create a HELLO.
83 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
86 * After how long do we consider a connection to a peer dead
87 * if we don't receive messages from the peer?
89 #define IDLE_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
93 * Entry in linked list of network addresses.
98 * This is a linked list.
100 struct AddressList *next;
103 * The address, actually a pointer to the end
104 * of this struct. Do not free!
109 * How long until we auto-expire this address (unless it is
110 * re-confirmed by the transport)?
112 struct GNUNET_TIME_Absolute expires;
123 * Entry in linked list of all of our plugins.
125 struct TransportPlugin
129 * This is a linked list.
131 struct TransportPlugin *next;
134 * API of the transport as returned by the plugin's
135 * initialization function.
137 struct GNUNET_TRANSPORT_PluginFunctions *api;
140 * Short name for the plugin (i.e. "tcp").
145 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
150 * List of our known addresses for this transport.
152 struct AddressList *addresses;
155 * Environment this transport service is using
158 struct GNUNET_TRANSPORT_PluginEnvironment env;
161 * ID of task that is used to clean up expired addresses.
163 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
167 * Set to GNUNET_YES if we need to scrap the existing
168 * list of "addresses" and start fresh when we receive
169 * the next address update from a transport. Set to
170 * GNUNET_NO if we should just add the new address
171 * to the list and wait for the commit call.
176 struct NeighbourList;
179 * For each neighbour we keep a list of messages
180 * that we still want to transmit to the neighbour.
186 * This is a linked list.
188 struct MessageQueue *next;
191 * The message we want to transmit.
193 struct GNUNET_MessageHeader *message;
196 * Client responsible for queueing the message;
197 * used to check that a client has not two messages
198 * pending for the same target. Can be NULL.
200 struct TransportClient *client;
203 * Neighbour this entry belongs to.
205 struct NeighbourList *neighbour;
208 * Plugin that we used for the transmission.
209 * NULL until we scheduled a transmission.
211 struct TransportPlugin *plugin;
214 * Internal message of the transport system that should not be
215 * included in the usual SEND-SEND_OK transmission confirmation
216 * traffic management scheme. Typically, "internal_msg" will
217 * be set whenever "client" is NULL (but it is not strictly
226 * For a given Neighbour, which plugins are available
227 * to talk to this peer and what are their costs?
233 * This is a linked list.
235 struct ReadyList *next;
238 * Which of our transport plugins does this entry
241 struct TransportPlugin *plugin;
244 * Neighbour this entry belongs to.
246 struct NeighbourList *neighbour;
249 * Opaque handle (specific to the plugin) for the
250 * connection to our target; can be NULL.
255 * What was the last latency observed for this plugin
256 * and peer? Invalid if connected is GNUNET_NO.
258 struct GNUNET_TIME_Relative latency;
261 * If we did not successfully transmit a message to the
262 * given peer via this connection during the specified
263 * time, we should consider the connection to be dead.
264 * This is used in the case that a TCP transport simply
265 * stalls writing to the stream but does not formerly
266 * get a signal that the other peer died.
268 struct GNUNET_TIME_Absolute timeout;
271 * Is this plugin currently connected? The first time
272 * we transmit or send data to a peer via a particular
273 * plugin, we set this to GNUNET_YES. If we later get
274 * an error (disconnect notification or transmission
275 * failure), we set it back to GNUNET_NO. Each time the
276 * value is set to GNUNET_YES, we increment the
277 * "connect_attempts" counter. If that one reaches a
278 * particular threshold, we consider the plugin to not
279 * be working properly at this time for the given peer
280 * and remove it from the eligible list.
285 * How often have we tried to connect using this plugin?
287 unsigned int connect_attempts;
290 * Is this plugin ready to transmit to the specific
291 * target? GNUNET_NO if not. Initially, all plugins
292 * are marked ready. If a transmission is in progress,
293 * "transmit_ready" is set to GNUNET_NO.
301 * Entry in linked list of all of our current neighbours.
307 * This is a linked list.
309 struct NeighbourList *next;
312 * Which of our transports is connected to this peer
313 * and what is their status?
315 struct ReadyList *plugins;
318 * List of messages we would like to send to this peer;
319 * must contain at most one message per client.
321 struct MessageQueue *messages;
324 * Identity of this neighbour.
326 struct GNUNET_PeerIdentity id;
329 * ID of task scheduled to run when this peer is about to
330 * time out (will free resources associated with the peer).
332 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
335 * How long until we should consider this peer dead
336 * (if we don't receive another message in the
339 struct GNUNET_TIME_Absolute peer_timeout;
342 * At what time did we reset last_received last?
344 struct GNUNET_TIME_Absolute last_quota_update;
347 * At what time should we try to again add plugins to
350 struct GNUNET_TIME_Absolute retry_plugins_time;
353 * How many bytes have we received since the "last_quota_update"
356 uint64_t last_received;
359 * Global quota for outbound traffic for the neighbour in bytes/ms.
364 * What is the latest version of our HELLO that we have
365 * sent to this neighbour?
367 unsigned int hello_version_sent;
370 * How often has the other peer (recently) violated the
371 * inbound traffic limit? Incremented by 10 per violation,
372 * decremented by 1 per non-violation (for each
375 unsigned int quota_violation_count;
378 * Have we seen an ACK from this neighbour in the past?
379 * (used to make up a fake ACK for clients connecting after
380 * the neighbour connected to us).
388 * Linked list of messages to be transmitted to
389 * the client. Each entry is followed by the
392 struct ClientMessageQueueEntry
395 * This is a linked list.
397 struct ClientMessageQueueEntry *next;
402 * Client connected to the transport service.
404 struct TransportClient
408 * This is a linked list.
410 struct TransportClient *next;
413 * Handle to the client.
415 struct GNUNET_SERVER_Client *client;
418 * Linked list of messages yet to be transmitted to
421 struct ClientMessageQueueEntry *message_queue_head;
424 * Tail of linked list of messages yet to be transmitted to the
427 struct ClientMessageQueueEntry *message_queue_tail;
430 * Is a call to "transmit_send_continuation" pending? If so, we
431 * must not free this struct (even if the corresponding client
432 * disconnects) and instead only remove it from the linked list and
433 * set the "client" field to NULL.
438 * Length of the list of messages pending for this client.
440 unsigned int message_count;
446 * Message used to ask a peer to validate receipt (to check an address
447 * from a HELLO). Followed by the address used. Note that the
448 * recipients response does not affirm that he has this address,
449 * only that he got the challenge message.
451 struct ValidationChallengeMessage
455 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
457 struct GNUNET_MessageHeader header;
460 * What are we signing and why?
462 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
465 * Random challenge number (in network byte order).
467 uint32_t challenge GNUNET_PACKED;
470 * Who is the intended recipient?
472 struct GNUNET_PeerIdentity target;
477 * Message used to validate a HELLO. If this was
478 * the right recipient, the response is a signature
479 * of the original validation request. The
480 * challenge is included in the confirmation to make
481 * matching of replies to requests possible.
483 struct ValidationChallengeResponse
487 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
489 struct GNUNET_MessageHeader header;
492 * Random challenge number (in network byte order).
494 uint32_t challenge GNUNET_PACKED;
497 * Who signed this message?
499 struct GNUNET_PeerIdentity sender;
504 struct GNUNET_CRYPTO_RsaSignature signature;
510 * For each HELLO, we may have to validate multiple addresses;
511 * each address gets its own request entry.
513 struct ValidationAddress
516 * This is a linked list.
518 struct ValidationAddress *next;
521 * Our challenge message. Points to after this
522 * struct, so this field should not be freed.
524 struct ValidationChallengeMessage *msg;
527 * Name of the transport.
529 char *transport_name;
532 * When should this validated address expire?
534 struct GNUNET_TIME_Absolute expiration;
537 * Length of the address we are validating.
542 * Set to GNUNET_YES if the challenge was met,
543 * GNUNET_SYSERR if we know it failed, GNUNET_NO
544 * if we are waiting on a response.
551 * Entry in linked list of all HELLOs awaiting validation.
553 struct ValidationList
557 * This is a linked list.
559 struct ValidationList *next;
562 * Linked list with one entry per address from the HELLO
563 * that needs to be validated.
565 struct ValidationAddress *addresses;
568 * The public key of the peer.
570 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
573 * When does this record time-out? (assuming the
574 * challenge goes unanswered)
576 struct GNUNET_TIME_Absolute timeout;
582 * HELLOs awaiting validation.
584 static struct ValidationList *pending_validations;
589 static struct GNUNET_HELLO_Message *our_hello;
592 * "version" of "our_hello". Used to see if a given
593 * neighbour has already been sent the latest version
594 * of our HELLO message.
596 static unsigned int our_hello_version;
601 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
606 static struct GNUNET_PeerIdentity my_identity;
611 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
616 struct GNUNET_SCHEDULER_Handle *sched;
621 struct GNUNET_CONFIGURATION_Handle *cfg;
624 * Linked list of all clients to this service.
626 static struct TransportClient *clients;
629 * All loaded plugins.
631 static struct TransportPlugin *plugins;
636 static struct GNUNET_SERVER_Handle *server;
639 * All known neighbours and their HELLOs.
641 static struct NeighbourList *neighbours;
644 * Default bandwidth quota for receiving for new peers in bytes/ms.
646 static uint32_t default_quota_in;
649 * Default bandwidth quota for sending for new peers in bytes/ms.
651 static uint32_t default_quota_out;
654 * Number of neighbours we'd like to have.
656 static uint32_t max_connect_per_transport;
660 * Find an entry in the neighbour list for a particular peer.
662 * @return NULL if not found.
664 static struct NeighbourList *
665 find_neighbour (const struct GNUNET_PeerIdentity *key)
667 struct NeighbourList *head = neighbours;
668 while ((head != NULL) &&
669 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
676 * Find an entry in the transport list for a particular transport.
678 * @return NULL if not found.
680 static struct TransportPlugin *
681 find_transport (const char *short_name)
683 struct TransportPlugin *head = plugins;
684 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
691 * Update the quota values for the given neighbour now.
694 update_quota (struct NeighbourList *n)
696 struct GNUNET_TIME_Relative delta;
700 delta = GNUNET_TIME_absolute_get_duration (n->last_quota_update);
701 if (delta.value < MIN_QUOTA_REFRESH_TIME)
702 return; /* not enough time passed for doing quota update */
703 allowed = delta.value * n->quota_in;
704 if (n->last_received < allowed)
706 remaining = allowed - n->last_received;
708 remaining /= n->quota_in;
711 if (remaining > MAX_BANDWIDTH_CARRY)
712 remaining = MAX_BANDWIDTH_CARRY;
713 n->last_received = 0;
714 n->last_quota_update = GNUNET_TIME_absolute_get ();
715 n->last_quota_update.value -= remaining;
716 if (n->quota_violation_count > 0)
717 n->quota_violation_count--;
721 n->last_received -= allowed;
722 n->last_quota_update = GNUNET_TIME_absolute_get ();
723 if (n->last_received > allowed)
725 /* more than twice the allowed rate! */
726 n->quota_violation_count += 10;
733 * Function called to notify a client about the socket
734 * being ready to queue more data. "buf" will be
735 * NULL and "size" zero if the socket was closed for
736 * writing in the meantime.
739 * @param size number of bytes available in buf
740 * @param buf where the callee should write the message
741 * @return number of bytes written to buf
744 transmit_to_client_callback (void *cls, size_t size, void *buf)
746 struct TransportClient *client = cls;
747 struct ClientMessageQueueEntry *q;
750 const struct GNUNET_MessageHeader *msg;
751 struct GNUNET_NETWORK_TransmitHandle *th;
756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
757 "Transmission to client failed, closing connection.\n");
758 /* fatal error with client, free message queue! */
759 while (NULL != (q = client->message_queue_head))
761 client->message_queue_head = q->next;
764 client->message_queue_tail = NULL;
765 client->message_count = 0;
770 while (NULL != (q = client->message_queue_head))
772 msg = (const struct GNUNET_MessageHeader *) &q[1];
773 msize = ntohs (msg->size);
774 if (msize + tsize > size)
776 client->message_queue_head = q->next;
778 client->message_queue_tail = NULL;
779 memcpy (&cbuf[tsize], msg, msize);
782 client->message_count--;
784 GNUNET_assert (tsize > 0);
787 th = GNUNET_SERVER_notify_transmit_ready (client->client,
789 GNUNET_TIME_UNIT_FOREVER_REL,
790 &transmit_to_client_callback,
792 GNUNET_assert (th != NULL);
799 * Send the specified message to the specified client. Since multiple
800 * messages may be pending for the same client at a time, this code
801 * makes sure that no message is lost.
803 * @param client client to transmit the message to
804 * @param msg the message to send
805 * @param may_drop can this message be dropped if the
806 * message queue for this client is getting far too large?
809 transmit_to_client (struct TransportClient *client,
810 const struct GNUNET_MessageHeader *msg, int may_drop)
812 struct ClientMessageQueueEntry *q;
814 struct GNUNET_NETWORK_TransmitHandle *th;
816 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
818 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
820 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
821 client->message_count, MAX_PENDING);
822 /* TODO: call to statistics... */
825 client->message_count++;
826 msize = ntohs (msg->size);
827 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
828 memcpy (&q[1], msg, msize);
829 /* append to message queue */
830 if (client->message_queue_tail == NULL)
832 client->message_queue_tail = q;
836 client->message_queue_tail->next = q;
837 client->message_queue_tail = q;
839 if (client->message_queue_head == NULL)
841 client->message_queue_head = q;
842 th = GNUNET_SERVER_notify_transmit_ready (client->client,
844 GNUNET_TIME_UNIT_FOREVER_REL,
845 &transmit_to_client_callback,
847 GNUNET_assert (th != NULL);
853 * Find alternative plugins for communication.
855 * @param neighbour for which neighbour should we try to find
859 try_alternative_plugins (struct NeighbourList *neighbour)
861 struct ReadyList *rl;
863 if ((neighbour->plugins != NULL) &&
864 (neighbour->retry_plugins_time.value >
865 GNUNET_TIME_absolute_get ().value))
866 return; /* don't try right now */
867 neighbour->retry_plugins_time
868 = GNUNET_TIME_relative_to_absolute (PLUGIN_RETRY_FREQUENCY);
870 rl = neighbour->plugins;
873 if (rl->connect_attempts > 0)
874 rl->connect_attempts--; /* amnesty */
882 * Check the ready list for the given neighbour and
883 * if a plugin is ready for transmission (and if we
884 * have a message), do so!
886 * @param neighbour target peer for which to check the plugins
888 static void try_transmission_to_peer (struct NeighbourList *neighbour);
892 * Function called by the GNUNET_TRANSPORT_TransmitFunction
893 * upon "completion" of a send request. This tells the API
894 * that it is now legal to send another message to the given
897 * @param cls closure, identifies the entry on the
898 * message queue that was transmitted and the
899 * client responsible for queueing the message
900 * @param rl identifies plugin used for the transmission for
901 * this neighbour; needs to be re-enabled for
902 * future transmissions
903 * @param target the peer receiving the message
904 * @param result GNUNET_OK on success, if the transmission
905 * failed, we should not tell the client to transmit
909 transmit_send_continuation (void *cls,
910 struct ReadyList *rl,
911 const struct GNUNET_PeerIdentity *target,
914 struct MessageQueue *mq = cls;
915 struct SendOkMessage send_ok_msg;
916 struct NeighbourList *n;
918 GNUNET_assert (mq != NULL);
920 GNUNET_assert (n != NULL);
922 memcmp (&n->id, target,
923 sizeof (struct GNUNET_PeerIdentity)));
927 while ((rl != NULL) && (rl->plugin != mq->plugin))
929 GNUNET_assert (rl != NULL);
931 if (result == GNUNET_OK)
933 rl->timeout = GNUNET_TIME_relative_to_absolute (IDLE_CONNECTION_TIMEOUT);
937 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
938 "Transmission failed, marking connection as down.\n");
939 rl->connected = GNUNET_NO;
941 if (!mq->internal_msg)
942 rl->transmit_ready = GNUNET_YES;
943 if (mq->client != NULL)
945 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
946 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
947 send_ok_msg.success = htonl (result);
948 send_ok_msg.peer = n->id;
949 transmit_to_client (mq->client, &send_ok_msg.header, GNUNET_NO);
951 GNUNET_free (mq->message);
953 /* one plugin just became ready again, try transmitting
954 another message (if available) */
955 try_transmission_to_peer (n);
962 * We could not use an existing (or validated) connection to
963 * talk to a peer. Try addresses that have not yet been
966 * @param n neighbour we want to communicate with
967 * @return plugin ready to talk, or NULL if none is available
969 static struct ReadyList *
970 try_unvalidated_addresses (struct NeighbourList *n)
972 struct ValidationList *vl;
973 struct ValidationAddress *va;
974 struct GNUNET_PeerIdentity id;
975 struct GNUNET_TIME_Absolute now;
978 struct ReadyList *rl;
979 struct TransportPlugin *plugin;
982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
983 "Trying to connect to `%4s' using unvalidated addresses\n",
984 GNUNET_i2s (&n->id));
986 /* NOTE: this function needs to not only identify the
987 plugin but also setup "plugin_handle", binding it to the
988 right address using the plugin's "send_to" API */
989 now = GNUNET_TIME_absolute_get ();
990 vl = pending_validations;
993 GNUNET_CRYPTO_hash (&vl->publicKey,
995 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
997 if (0 == memcmp (&id, &n->id, sizeof (struct GNUNET_PeerIdentity)))
1004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1005 "No unvalidated address found for peer `%4s'\n",
1006 GNUNET_i2s (&n->id));
1016 if (va->expiration.value > now.value)
1023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1024 "All %u unvalidated addresses for peer have expired\n",
1029 total = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, total);
1030 for (va = vl->addresses; va != NULL; va = va->next)
1032 if (va->expiration.value <= now.value)
1040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1041 "Trying unvalidated address of `%s' transport\n",
1042 va->transport_name);
1044 plugin = find_transport (va->transport_name);
1050 rl = GNUNET_malloc (sizeof (struct ReadyList));
1051 rl->next = n->plugins;
1053 rl->plugin = plugin;
1054 rl->plugin_handle = plugin->api->send_to (plugin->api->cls,
1058 GNUNET_TIME_UNIT_ZERO,
1059 &va->msg[1], va->addr_len);
1060 rl->transmit_ready = GNUNET_YES;
1068 * Check the ready list for the given neighbour and
1069 * if a plugin is ready for transmission (and if we
1070 * have a message), do so!
1073 try_transmission_to_peer (struct NeighbourList *neighbour)
1075 struct ReadyList *pos;
1076 struct GNUNET_TIME_Relative min_latency;
1077 struct ReadyList *rl;
1078 struct MessageQueue *mq;
1079 struct GNUNET_TIME_Absolute now;
1081 if (neighbour->messages == NULL)
1082 return; /* nothing to do */
1083 try_alternative_plugins (neighbour);
1084 min_latency = GNUNET_TIME_UNIT_FOREVER_REL;
1086 mq = neighbour->messages;
1087 now = GNUNET_TIME_absolute_get ();
1088 pos = neighbour->plugins;
1091 /* set plugins that are inactive for a long time back to disconnected */
1092 if ((pos->timeout.value < now.value) && (pos->connected == GNUNET_YES))
1095 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1096 "Marking long-time inactive connection to `%4s' as down.\n",
1097 GNUNET_i2s (&neighbour->id));
1099 pos->connected = GNUNET_NO;
1101 if (((GNUNET_YES == pos->transmit_ready) ||
1102 (mq->internal_msg)) &&
1103 (pos->connect_attempts < MAX_CONNECT_RETRY) &&
1104 ((rl == NULL) || (min_latency.value > pos->latency.value)))
1107 min_latency = pos->latency;
1112 rl = try_unvalidated_addresses (neighbour);
1116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1117 "No plugin ready to transmit message\n");
1119 return; /* nobody ready */
1121 if (GNUNET_NO == rl->connected)
1123 rl->connect_attempts++;
1124 rl->connected = GNUNET_YES;
1126 neighbour->messages = mq->next;
1127 mq->plugin = rl->plugin;
1128 if (!mq->internal_msg)
1129 rl->transmit_ready = GNUNET_NO;
1131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1132 "Giving message of type `%u' for `%4s' to plugin `%s'\n",
1133 ntohs (mq->message->type),
1134 GNUNET_i2s (&neighbour->id), rl->plugin->short_name);
1137 = rl->plugin->api->send (rl->plugin->api->cls,
1142 IDLE_CONNECTION_TIMEOUT,
1143 &transmit_send_continuation, mq);
1148 * Send the specified message to the specified peer.
1150 * @param client source of the transmission request (can be NULL)
1151 * @param msg message to send
1152 * @param is_internal is this an internal message
1153 * @param neighbour handle to the neighbour for transmission
1156 transmit_to_peer (struct TransportClient *client,
1157 const struct GNUNET_MessageHeader *msg,
1158 int is_internal, struct NeighbourList *neighbour)
1160 struct MessageQueue *mq;
1161 struct MessageQueue *mqe;
1162 struct GNUNET_MessageHeader *m;
1165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1166 _("Sending message of type %u to peer `%4s'\n"),
1167 ntohs (msg->type), GNUNET_i2s (&neighbour->id));
1171 /* check for duplicate submission */
1172 mq = neighbour->messages;
1175 if (mq->client == client)
1177 /* client transmitted to same peer twice
1178 before getting SendOk! */
1185 mq = GNUNET_malloc (sizeof (struct MessageQueue));
1186 mq->client = client;
1187 m = GNUNET_malloc (ntohs (msg->size));
1188 memcpy (m, msg, ntohs (msg->size));
1190 mq->neighbour = neighbour;
1191 mq->internal_msg = is_internal;
1194 mqe = neighbour->messages;
1196 while (mqe->next != NULL)
1201 neighbour->messages = mq;
1202 try_transmission_to_peer (neighbour);
1212 struct GeneratorContext
1214 struct TransportPlugin *plug_pos;
1215 struct AddressList *addr_pos;
1216 struct GNUNET_TIME_Absolute expiration;
1221 address_generator (void *cls, size_t max, void *buf)
1223 struct GeneratorContext *gc = cls;
1226 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1228 gc->plug_pos = gc->plug_pos->next;
1229 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1231 if (NULL == gc->plug_pos)
1233 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1236 gc->addr_pos->addrlen, buf, max);
1237 gc->addr_pos = gc->addr_pos->next;
1243 * Construct our HELLO message from all of the addresses of
1244 * all of the transports.
1249 struct GNUNET_HELLO_Message *hello;
1250 struct TransportClient *cpos;
1251 struct NeighbourList *npos;
1252 struct GeneratorContext gc;
1255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1256 "Refreshing my HELLO\n");
1258 gc.plug_pos = plugins;
1259 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1260 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1261 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1263 while (cpos != NULL)
1265 transmit_to_client (cpos,
1266 (const struct GNUNET_MessageHeader *) hello,
1271 GNUNET_free_non_null (our_hello);
1273 our_hello_version++;
1275 while (npos != NULL)
1277 transmit_to_peer (NULL,
1278 (const struct GNUNET_MessageHeader *) our_hello,
1286 * Task used to clean up expired addresses for a plugin.
1288 * @param cls closure
1292 expire_address_task (void *cls,
1293 const struct GNUNET_SCHEDULER_TaskContext *tc);
1297 * Update the list of addresses for this plugin,
1298 * expiring those that are past their expiration date.
1300 * @param plugin addresses of which plugin should be recomputed?
1301 * @param fresh set to GNUNET_YES if a new address was added
1302 * and we need to regenerate the HELLO even if nobody
1306 update_addresses (struct TransportPlugin *plugin, int fresh)
1308 struct GNUNET_TIME_Relative min_remaining;
1309 struct GNUNET_TIME_Relative remaining;
1310 struct GNUNET_TIME_Absolute now;
1311 struct AddressList *pos;
1312 struct AddressList *prev;
1313 struct AddressList *next;
1316 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_PREREQUISITE_TASK)
1317 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1318 plugin->address_update_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
1319 now = GNUNET_TIME_absolute_get ();
1320 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1321 expired = GNUNET_NO;
1323 pos = plugin->addresses;
1327 if (pos->expires.value < now.value)
1329 expired = GNUNET_YES;
1331 plugin->addresses = pos->next;
1333 prev->next = pos->next;
1338 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1339 if (remaining.value < min_remaining.value)
1340 min_remaining = remaining;
1346 if (expired || fresh)
1348 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1349 plugin->address_update_task
1350 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1352 GNUNET_SCHEDULER_PRIORITY_IDLE,
1353 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
1355 &expire_address_task, plugin);
1361 * Task used to clean up expired addresses for a plugin.
1363 * @param cls closure
1367 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1369 struct TransportPlugin *plugin = cls;
1370 plugin->address_update_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
1371 update_addresses (plugin, GNUNET_NO);
1376 * Function that must be called by each plugin to notify the
1377 * transport service about the addresses under which the transport
1378 * provided by the plugin can be reached.
1380 * @param cls closure
1381 * @param name name of the transport that generated the address
1382 * @param addr one of the addresses of the host, NULL for the last address
1383 * the specific address format depends on the transport
1384 * @param addrlen length of the address
1385 * @param expires when should this address automatically expire?
1388 plugin_env_notify_address (void *cls,
1392 struct GNUNET_TIME_Relative expires)
1394 struct TransportPlugin *p = cls;
1395 struct AddressList *al;
1396 struct GNUNET_TIME_Absolute abex;
1399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1400 "Plugin `%s' informs us about a new address `%s'\n", name,
1401 GNUNET_a2s(addr, addrlen));
1403 abex = GNUNET_TIME_relative_to_absolute (expires);
1404 GNUNET_assert (p == find_transport (name));
1409 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1411 if (al->expires.value < abex.value)
1417 al = GNUNET_malloc (sizeof (struct AddressList) + addrlen);
1419 al->next = p->addresses;
1422 al->addrlen = addrlen;
1423 memcpy (&al[1], addr, addrlen);
1424 update_addresses (p, GNUNET_YES);
1428 struct LookupHelloContext
1430 GNUNET_TRANSPORT_AddressCallback iterator;
1437 lookup_address_callback (void *cls,
1439 struct GNUNET_TIME_Absolute expiration,
1440 const void *addr, size_t addrlen)
1442 struct LookupHelloContext *lhc = cls;
1443 lhc->iterator (lhc->iterator_cls, tname, addr, addrlen);
1449 lookup_hello_callback (void *cls,
1450 const struct GNUNET_PeerIdentity *peer,
1451 const struct GNUNET_HELLO_Message *h, uint32_t trust)
1453 struct LookupHelloContext *lhc = cls;
1457 lhc->iterator (lhc->iterator_cls, NULL, NULL, 0);
1463 GNUNET_HELLO_iterate_addresses (h,
1464 GNUNET_NO, &lookup_address_callback, lhc);
1469 * Function that allows a transport to query the known
1470 * network addresses for a given peer.
1472 * @param cls closure
1473 * @param timeout after how long should we time out?
1474 * @param target which peer are we looking for?
1475 * @param iter function to call for each known address
1476 * @param iter_cls closure for iter
1479 plugin_env_lookup_address (void *cls,
1480 struct GNUNET_TIME_Relative timeout,
1481 const struct GNUNET_PeerIdentity *target,
1482 GNUNET_TRANSPORT_AddressCallback iter,
1485 struct LookupHelloContext *lhc;
1487 lhc = GNUNET_malloc (sizeof (struct LookupHelloContext));
1488 lhc->iterator = iter;
1489 lhc->iterator_cls = iter_cls;
1490 GNUNET_PEERINFO_for_all (cfg,
1492 target, 0, timeout, &lookup_hello_callback, &lhc);
1497 * Notify all of our clients about a peer connecting.
1500 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1501 struct GNUNET_TIME_Relative latency)
1503 struct ConnectInfoMessage cim;
1504 struct TransportClient *cpos;
1507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1508 "Informing clients about peer `%4s' connecting to us\n",
1511 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1512 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1513 cim.quota_out = htonl (default_quota_out);
1514 cim.latency = GNUNET_TIME_relative_hton (latency);
1515 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1517 while (cpos != NULL)
1519 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1526 * Notify all of our clients about a peer disconnecting.
1529 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1531 struct DisconnectInfoMessage dim;
1532 struct TransportClient *cpos;
1535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1536 "Informing clients about peer `%4s' disconnecting\n",
1539 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1540 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1541 dim.reserved = htonl (0);
1542 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1544 while (cpos != NULL)
1546 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1553 * Copy any validated addresses to buf.
1555 * @return 0 once all addresses have been
1559 list_validated_addresses (void *cls, size_t max, void *buf)
1561 struct ValidationAddress **va = cls;
1564 while ((NULL != *va) && ((*va)->ok != GNUNET_YES))
1568 ret = GNUNET_HELLO_add_address ((*va)->transport_name,
1570 &(*va)->msg[1], (*va)->addr_len, buf, max);
1577 * HELLO validation cleanup task.
1580 cleanup_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1582 struct ValidationAddress *va;
1583 struct ValidationList *pos;
1584 struct ValidationList *prev;
1585 struct GNUNET_TIME_Absolute now;
1586 struct GNUNET_HELLO_Message *hello;
1587 struct GNUNET_PeerIdentity pid;
1590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1591 "HELLO validation cleanup background task running...\n");
1593 now = GNUNET_TIME_absolute_get ();
1595 pos = pending_validations;
1598 if (pos->timeout.value < now.value)
1601 pending_validations = pos->next;
1603 prev->next = pos->next;
1604 va = pos->addresses;
1605 hello = GNUNET_HELLO_create (&pos->publicKey,
1606 &list_validated_addresses, &va);
1607 GNUNET_CRYPTO_hash (&pos->publicKey,
1609 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1613 "Creating persistent `%s' message for peer `%4s' based on confirmed addresses.\n",
1614 "HELLO", GNUNET_i2s (&pid));
1616 GNUNET_PEERINFO_add_peer (cfg, sched, &pid, hello);
1617 GNUNET_free (hello);
1618 while (NULL != (va = pos->addresses))
1620 pos->addresses = va->next;
1621 GNUNET_free (va->transport_name);
1626 pos = pending_validations;
1635 /* finally, reschedule cleanup if needed; list is
1636 ordered by timeout, so we need the last element... */
1637 pos = pending_validations;
1638 while ((pos != NULL) && (pos->next != NULL))
1641 GNUNET_SCHEDULER_add_delayed (sched,
1643 GNUNET_SCHEDULER_PRIORITY_IDLE,
1644 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
1645 GNUNET_TIME_absolute_get_remaining
1646 (pos->timeout), &cleanup_validation, NULL);
1650 struct CheckHelloValidatedContext
1653 * Plugin for which we are validating.
1655 struct TransportPlugin *plugin;
1658 * Hello that we are validating.
1660 struct GNUNET_HELLO_Message *hello;
1663 * Validation list being build.
1665 struct ValidationList *e;
1671 * Append the given address to the list of entries
1672 * that need to be validated.
1675 run_validation (void *cls,
1677 struct GNUNET_TIME_Absolute expiration,
1678 const void *addr, size_t addrlen)
1680 struct ValidationList *e = cls;
1681 struct TransportPlugin *tp;
1682 struct ValidationAddress *va;
1683 struct ValidationChallengeMessage *vcm;
1684 struct GNUNET_PeerIdentity id;
1686 tp = find_transport (tname);
1689 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1690 GNUNET_ERROR_TYPE_BULK,
1692 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
1696 GNUNET_CRYPTO_hash (&e->publicKey,
1698 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1701 "Scheduling validation of address `%s' via `%s' for `%4s'\n",
1702 GNUNET_a2s(addr, addrlen),
1706 va = GNUNET_malloc (sizeof (struct ValidationAddress) +
1707 sizeof (struct ValidationChallengeMessage) + addrlen);
1708 va->next = e->addresses;
1710 vcm = (struct ValidationChallengeMessage *) &va[1];
1712 va->transport_name = GNUNET_strdup (tname);
1713 va->addr_len = addrlen;
1715 htons (sizeof (struct ValidationChallengeMessage) + addrlen);
1716 vcm->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
1718 htonl (sizeof (struct ValidationChallengeMessage) + addrlen -
1719 sizeof (struct GNUNET_MessageHeader));
1720 vcm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_HELLO);
1721 vcm->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1724 memcpy (&vcm[1], addr, addrlen);
1730 * Check if addresses in validated hello "h" overlap with
1731 * those in "chvc->hello" and update "chvc->hello" accordingly,
1732 * removing those addresses that have already been validated.
1735 check_hello_validated (void *cls,
1736 const struct GNUNET_PeerIdentity *peer,
1737 const struct GNUNET_HELLO_Message *h, uint32_t trust)
1739 struct CheckHelloValidatedContext *chvc = cls;
1740 struct ValidationAddress *va;
1741 struct TransportPlugin *tp;
1744 first_call = GNUNET_NO;
1745 if (chvc->e == NULL)
1747 first_call = GNUNET_YES;
1748 chvc->e = GNUNET_malloc (sizeof (struct ValidationList));
1749 GNUNET_assert (GNUNET_OK ==
1750 GNUNET_HELLO_get_key (h != NULL ? h : chvc->hello,
1751 &chvc->e->publicKey));
1753 GNUNET_TIME_relative_to_absolute (HELLO_VERIFICATION_TIMEOUT);
1754 chvc->e->next = pending_validations;
1755 pending_validations = chvc->e;
1759 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
1761 GNUNET_TIME_absolute_get (),
1762 &run_validation, chvc->e);
1764 else if (GNUNET_YES == first_call)
1766 /* no existing HELLO, all addresses are new */
1767 GNUNET_HELLO_iterate_addresses (chvc->hello,
1768 GNUNET_NO, &run_validation, chvc->e);
1771 return; /* wait for next call */
1772 /* finally, transmit validation attempts */
1773 va = chvc->e->addresses;
1777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1778 "Establishing `%s' connection to validate `%s' of `%4s' (sending our `%s')\n",
1780 "HELLO", GNUNET_i2s (&va->msg->target), "HELLO");
1782 tp = find_transport (va->transport_name);
1783 GNUNET_assert (tp != NULL);
1785 tp->api->send_to (tp->api->cls,
1787 (const struct GNUNET_MessageHeader *) our_hello,
1789 HELLO_VERIFICATION_TIMEOUT,
1790 &va->msg[1], va->addr_len))
1791 va->ok = GNUNET_SYSERR;
1794 if (chvc->e->next == NULL)
1795 GNUNET_SCHEDULER_add_delayed (sched,
1797 GNUNET_SCHEDULER_PRIORITY_IDLE,
1798 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
1799 GNUNET_TIME_absolute_get_remaining
1800 (chvc->e->timeout), &cleanup_validation,
1807 * Process HELLO-message.
1809 * @param plugin transport involved, may be NULL
1810 * @param message the actual message
1811 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
1814 process_hello (struct TransportPlugin *plugin,
1815 const struct GNUNET_MessageHeader *message)
1817 struct ValidationList *e;
1819 struct GNUNET_PeerIdentity target;
1820 const struct GNUNET_HELLO_Message *hello;
1821 struct CheckHelloValidatedContext *chvc;
1822 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
1824 hsize = ntohs (message->size);
1825 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
1826 (hsize < sizeof (struct GNUNET_MessageHeader)))
1829 return GNUNET_SYSERR;
1831 /* first, check if load is too high */
1832 if (GNUNET_OS_load_cpu_get (cfg) > 100)
1834 /* TODO: call to stats? */
1837 hello = (const struct GNUNET_HELLO_Message *) message;
1838 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
1840 GNUNET_break_op (0);
1841 return GNUNET_SYSERR;
1843 GNUNET_CRYPTO_hash (&publicKey,
1844 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1845 &target.hashPubKey);
1847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1848 "Processing `%s' message for `%4s'\n",
1849 "HELLO", GNUNET_i2s (&target));
1851 /* check if a HELLO for this peer is already on the validation list */
1852 e = pending_validations;
1855 if (0 == memcmp (&e->publicKey,
1858 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)))
1860 /* TODO: call to stats? */
1862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1863 "`%s' message for peer `%4s' is already pending; ignoring new message\n",
1864 "HELLO", GNUNET_i2s (&target));
1870 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
1871 chvc->plugin = plugin;
1872 chvc->hello = (struct GNUNET_HELLO_Message *) &chvc[1];
1873 memcpy (chvc->hello, hello, hsize);
1874 /* finally, check if HELLO was previously validated
1875 (continuation will then schedule actual validation) */
1876 GNUNET_PEERINFO_for_all (cfg,
1880 HELLO_VERIFICATION_TIMEOUT,
1881 &check_hello_validated, chvc);
1887 * Handle PING-message. If the plugin that gave us the message is
1888 * able to queue the PONG immediately, we only queue one PONG.
1889 * Otherwise we send at most TWO PONG messages, one via an unconfirmed
1890 * transport and one via a confirmed transport. Both addresses are
1891 * selected randomly among those available.
1893 * @param plugin plugin that gave us the message
1894 * @param sender claimed sender of the PING
1895 * @param plugin_context context that might be used to send response
1896 * @param message the actual message
1899 process_ping (struct TransportPlugin *plugin,
1900 const struct GNUNET_PeerIdentity *sender,
1901 void *plugin_context,
1902 const struct GNUNET_MessageHeader *message)
1904 const struct ValidationChallengeMessage *vcm;
1905 struct ValidationChallengeResponse vcr;
1907 struct NeighbourList *n;
1910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1911 "Processing PING\n");
1913 msize = ntohs (message->size);
1914 if (msize < sizeof (struct ValidationChallengeMessage))
1916 GNUNET_break_op (0);
1919 vcm = (const struct ValidationChallengeMessage *) message;
1920 if (0 != memcmp (&vcm->target,
1921 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
1923 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1924 _("Received `%s' message not destined for me!\n"), "PING");
1925 /* TODO: call statistics */
1928 if ((ntohl (vcm->purpose.size) !=
1929 msize - sizeof (struct GNUNET_MessageHeader))
1930 || (ntohl (vcm->purpose.purpose) !=
1931 GNUNET_SIGNATURE_PURPOSE_TRANSPORT_HELLO))
1933 GNUNET_break_op (0);
1936 msize -= sizeof (struct ValidationChallengeMessage);
1938 plugin->api->address_suggested (plugin->api->cls, &vcm[1], msize))
1940 GNUNET_break_op (0);
1943 vcr.header.size = htons (sizeof (struct ValidationChallengeResponse));
1944 vcr.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1945 vcr.challenge = vcm->challenge;
1946 vcr.sender = my_identity;
1947 GNUNET_assert (GNUNET_OK ==
1948 GNUNET_CRYPTO_rsa_sign (my_private_key,
1949 &vcm->purpose, &vcr.signature));
1951 GNUNET_assert (GNUNET_OK ==
1952 GNUNET_CRYPTO_rsa_verify
1953 (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_HELLO, &vcm->purpose,
1954 &vcr.signature, &my_public_key));
1957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1958 "Trying to transmit PONG using inbound connection\n");
1960 n = find_neighbour (sender);
1966 transmit_to_peer (NULL, &vcr.header, GNUNET_YES, n);
1971 * Handle PONG-message.
1973 * @param message the actual message
1976 process_pong (struct TransportPlugin *plugin,
1977 const struct GNUNET_MessageHeader *message)
1979 const struct ValidationChallengeResponse *vcr;
1980 struct ValidationList *pos;
1981 struct GNUNET_PeerIdentity peer;
1982 struct ValidationAddress *va;
1987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1988 "Processing PONG\n");
1990 vcr = (const struct ValidationChallengeResponse *) message;
1991 pos = pending_validations;
1994 GNUNET_CRYPTO_hash (&pos->publicKey,
1996 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1999 memcmp (&peer, &vcr->sender, sizeof (struct GNUNET_PeerIdentity)))
2005 /* TODO: call statistics (unmatched PONG) */
2006 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2008 ("Received `%s' message but have no record of a matching `%s' message. Ignoring.\n"),
2012 all_done = GNUNET_YES;
2013 matched = GNUNET_NO;
2014 va = pos->addresses;
2017 if (va->msg->challenge == vcr->challenge)
2020 GNUNET_CRYPTO_rsa_verify
2021 (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_HELLO, &va->msg->purpose,
2022 &vcr->signature, &pos->publicKey))
2024 /* this could rarely happen if we used the same
2025 challenge number for the peer for two different
2026 transports / addresses, but the likelihood is
2028 GNUNET_break_op (0);
2033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2034 "Confirmed validity of peer address.\n");
2036 va->ok = GNUNET_YES;
2038 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
2039 matched = GNUNET_YES;
2042 if (va->ok != GNUNET_YES)
2043 all_done = GNUNET_NO;
2046 if (GNUNET_NO == matched)
2048 /* TODO: call statistics (unmatched PONG) */
2049 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2051 ("Received `%s' message but have no record of a matching `%s' message. Ignoring.\n"),
2054 if (GNUNET_YES == all_done)
2056 pos->timeout.value = 0;
2057 GNUNET_SCHEDULER_add_delayed (sched,
2059 GNUNET_SCHEDULER_PRIORITY_IDLE,
2060 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
2061 GNUNET_TIME_UNIT_ZERO,
2062 &cleanup_validation, NULL);
2068 * The peer specified by the given neighbour has timed-out. Update
2069 * our state and do the necessary notifications. Also notifies
2070 * our clients that the neighbour is now officially gone.
2072 * @param n the neighbour list entry for the peer
2075 disconnect_neighbour (struct NeighbourList *n)
2077 struct ReadyList *rpos;
2078 struct NeighbourList *npos;
2079 struct NeighbourList *nprev;
2080 struct MessageQueue *mq;
2083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2084 "Disconnecting from neighbour\n");
2086 /* remove n from neighbours list */
2089 while ((npos != NULL) && (npos != n))
2094 GNUNET_assert (npos != NULL);
2096 neighbours = n->next;
2098 nprev->next = n->next;
2100 /* notify all clients about disconnect */
2101 notify_clients_disconnect (&n->id);
2103 /* clean up all plugins, cancel connections & pending transmissions */
2104 while (NULL != (rpos = n->plugins))
2106 n->plugins = rpos->next;
2107 GNUNET_assert (rpos->neighbour == n);
2108 rpos->plugin->api->cancel (rpos->plugin->api->cls,
2109 rpos->plugin_handle, rpos, &n->id);
2113 /* free all messages on the queue */
2114 while (NULL != (mq = n->messages))
2116 n->messages = mq->next;
2117 GNUNET_assert (mq->neighbour == n);
2121 /* finally, free n itself */
2127 * Add an entry for each of our transport plugins
2128 * (that are able to send) to the list of plugins
2129 * for this neighbour.
2131 * @param neighbour to initialize
2134 add_plugins (struct NeighbourList *neighbour)
2136 struct TransportPlugin *tp;
2137 struct ReadyList *rl;
2139 neighbour->retry_plugins_time
2140 = GNUNET_TIME_relative_to_absolute (PLUGIN_RETRY_FREQUENCY);
2144 if (tp->api->send != NULL)
2146 rl = GNUNET_malloc (sizeof (struct ReadyList));
2147 rl->next = neighbour->plugins;
2148 neighbour->plugins = rl;
2150 rl->neighbour = neighbour;
2151 rl->transmit_ready = GNUNET_YES;
2159 neighbour_timeout_task (void *cls,
2160 const struct GNUNET_SCHEDULER_TaskContext *tc)
2162 struct NeighbourList *n = cls;
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2166 "Neighbour has timed out!\n");
2168 n->timeout_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
2169 disconnect_neighbour (n);
2175 * Create a fresh entry in our neighbour list for the given peer.
2176 * Will try to transmit our current HELLO to the new neighbour. Also
2177 * notifies our clients about the new "connection".
2179 * @param peer the peer for which we create the entry
2180 * @return the new neighbour list entry
2182 static struct NeighbourList *
2183 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer)
2185 struct NeighbourList *n;
2188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2189 "Setting up new neighbour `%4s', sending our HELLO to introduce ourselves\n",
2192 GNUNET_assert (our_hello != NULL);
2193 n = GNUNET_malloc (sizeof (struct NeighbourList));
2194 n->next = neighbours;
2197 n->last_quota_update = GNUNET_TIME_absolute_get ();
2199 GNUNET_TIME_relative_to_absolute (IDLE_CONNECTION_TIMEOUT);
2200 n->quota_in = default_quota_in;
2202 n->hello_version_sent = our_hello_version;
2203 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2205 GNUNET_SCHEDULER_PRIORITY_IDLE,
2206 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
2207 IDLE_CONNECTION_TIMEOUT,
2208 &neighbour_timeout_task, n);
2209 transmit_to_peer (NULL,
2210 (const struct GNUNET_MessageHeader *) our_hello,
2212 notify_clients_connect (peer, GNUNET_TIME_UNIT_FOREVER_REL);
2218 * Function called by the plugin for each received message.
2219 * Update data volumes, possibly notify plugins about
2220 * reducing the rate at which they read from the socket
2221 * and generally forward to our receive callback.
2223 * @param plugin_context value to pass to this plugin
2224 * to respond to the given peer (use is optional,
2225 * but may speed up processing)
2226 * @param service_context value passed to the transport-service
2227 * to identify the neighbour; will be NULL on the first
2228 * call for a given peer
2229 * @param latency estimated latency for communicating with the
2231 * @param peer (claimed) identity of the other peer
2232 * @param message the message, NULL if peer was disconnected
2233 * @return the new service_context that the plugin should use
2234 * for future receive calls for messages from this
2237 static struct ReadyList *
2238 plugin_env_receive (void *cls,
2239 void *plugin_context,
2240 struct ReadyList *service_context,
2241 struct GNUNET_TIME_Relative latency,
2242 const struct GNUNET_PeerIdentity *peer,
2243 const struct GNUNET_MessageHeader *message)
2245 const struct GNUNET_MessageHeader ack = {
2246 htons (sizeof (struct GNUNET_MessageHeader)),
2247 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ACK)
2249 struct TransportPlugin *plugin = cls;
2250 struct TransportClient *cpos;
2251 struct InboundMessage *im;
2253 struct NeighbourList *n;
2255 if (service_context != NULL)
2257 n = service_context->neighbour;
2258 GNUNET_assert (n != NULL);
2262 n = find_neighbour (peer);
2265 if (message == NULL)
2266 return NULL; /* disconnect of peer already marked down */
2267 n = setup_new_neighbour (peer);
2269 service_context = n->plugins;
2270 while ((service_context != NULL) && (plugin != service_context->plugin))
2271 service_context = service_context->next;
2272 GNUNET_assert ((plugin->api->send == NULL) ||
2273 (service_context != NULL));
2275 if (message == NULL)
2277 if ((service_context != NULL) &&
2278 (service_context->plugin_handle == plugin_context))
2280 service_context->connected = GNUNET_NO;
2281 service_context->plugin_handle = NULL;
2283 /* TODO: call stats */
2287 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2288 "Processing message of type `%u' received by plugin...\n",
2289 ntohs (message->type));
2291 if (service_context != NULL)
2293 if (service_context->connected == GNUNET_NO)
2295 service_context->connected = GNUNET_YES;
2296 service_context->transmit_ready = GNUNET_YES;
2297 service_context->connect_attempts++;
2299 service_context->timeout
2300 = GNUNET_TIME_relative_to_absolute (IDLE_CONNECTION_TIMEOUT);
2301 service_context->plugin_handle = plugin_context;
2302 service_context->latency = latency;
2304 /* update traffic received amount ... */
2305 msize = ntohs (message->size);
2306 n->last_received += msize;
2307 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2309 GNUNET_TIME_relative_to_absolute (IDLE_CONNECTION_TIMEOUT);
2311 GNUNET_SCHEDULER_add_delayed (sched, GNUNET_NO,
2312 GNUNET_SCHEDULER_PRIORITY_IDLE,
2313 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
2314 IDLE_CONNECTION_TIMEOUT,
2315 &neighbour_timeout_task, n);
2317 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
2319 /* dropping message due to frequent inbound volume violations! */
2320 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
2321 GNUNET_ERROR_TYPE_BULK,
2323 ("Dropping incoming message due to repeated bandwidth quota violations.\n"));
2324 /* TODO: call stats */
2325 GNUNET_assert (NULL != service_context->neighbour);
2326 return service_context;
2328 switch (ntohs (message->type))
2330 case GNUNET_MESSAGE_TYPE_HELLO:
2332 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2333 "Receiving `%s' message from other peer.\n", "HELLO");
2335 process_hello (plugin, message);
2337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2338 "Sending `%s' message to connecting peer.\n", "ACK");
2340 transmit_to_peer (NULL, &ack, GNUNET_YES, n);
2342 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
2343 process_ping (plugin, peer, plugin_context, message);
2345 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
2346 process_pong (plugin, message);
2348 case GNUNET_MESSAGE_TYPE_TRANSPORT_ACK:
2349 n->saw_ack = GNUNET_YES;
2350 /* intentional fall-through! */
2353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2354 "Received message of type %u from other peer, sending to all clients.\n",
2355 ntohs (message->type));
2357 /* transmit message to all clients */
2358 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
2359 im->header.size = htons (sizeof (struct InboundMessage) + msize);
2360 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
2361 im->latency = GNUNET_TIME_relative_hton (latency);
2363 memcpy (&im[1], message, msize);
2366 while (cpos != NULL)
2368 transmit_to_client (cpos, &im->header, GNUNET_YES);
2373 GNUNET_assert (NULL != service_context->neighbour);
2374 return service_context;
2379 * Handle START-message. This is the first message sent to us
2380 * by any client which causes us to add it to our list.
2382 * @param cls closure (always NULL)
2383 * @param client identification of the client
2384 * @param message the actual message
2387 handle_start (void *cls,
2388 struct GNUNET_SERVER_Client *client,
2389 const struct GNUNET_MessageHeader *message)
2391 struct TransportClient *c;
2392 struct ConnectInfoMessage cim;
2393 struct NeighbourList *n;
2394 struct InboundMessage *im;
2395 struct GNUNET_MessageHeader *ack;
2398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2399 "Received `%s' request from client\n", "START");
2404 if (c->client == client)
2406 /* client already on our list! */
2408 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2413 c = GNUNET_malloc (sizeof (struct TransportClient));
2417 if (our_hello != NULL)
2420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2421 "Sending our own HELLO to new client\n");
2423 transmit_to_client (c,
2424 (const struct GNUNET_MessageHeader *) our_hello,
2426 /* tell new client about all existing connections */
2427 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2428 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2429 cim.quota_out = htonl (default_quota_out);
2430 cim.latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO); /* FIXME? */
2431 im = GNUNET_malloc (sizeof (struct InboundMessage) +
2432 sizeof (struct GNUNET_MessageHeader));
2433 im->header.size = htons (sizeof (struct InboundMessage) +
2434 sizeof (struct GNUNET_MessageHeader));
2435 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
2436 im->latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO); /* FIXME? */
2437 ack = (struct GNUNET_MessageHeader *) &im[1];
2438 ack->size = htons (sizeof (struct GNUNET_MessageHeader));
2439 ack->type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ACK);
2440 for (n = neighbours; n != NULL; n = n->next)
2443 transmit_to_client (c, &cim.header, GNUNET_NO);
2447 transmit_to_client (c, &im->header, GNUNET_NO);
2452 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2457 * Handle HELLO-message.
2459 * @param cls closure (always NULL)
2460 * @param client identification of the client
2461 * @param message the actual message
2464 handle_hello (void *cls,
2465 struct GNUNET_SERVER_Client *client,
2466 const struct GNUNET_MessageHeader *message)
2471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2472 "Received `%s' request from client\n", "HELLO");
2474 ret = process_hello (NULL, message);
2475 GNUNET_SERVER_receive_done (client, ret);
2480 * Handle SEND-message.
2482 * @param cls closure (always NULL)
2483 * @param client identification of the client
2484 * @param message the actual message
2487 handle_send (void *cls,
2488 struct GNUNET_SERVER_Client *client,
2489 const struct GNUNET_MessageHeader *message)
2491 struct TransportClient *tc;
2492 struct NeighbourList *n;
2493 const struct OutboundMessage *obm;
2494 const struct GNUNET_MessageHeader *obmm;
2498 size = ntohs (message->size);
2500 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
2503 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2506 obm = (const struct OutboundMessage *) message;
2508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2509 "Received `%s' request from client with target `%4s'\n",
2510 "SEND", GNUNET_i2s (&obm->peer));
2512 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
2513 msize = ntohs (obmm->size);
2514 if (size != msize + sizeof (struct OutboundMessage))
2517 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2520 n = find_neighbour (&obm->peer);
2522 n = setup_new_neighbour (&obm->peer);
2524 while ((tc != NULL) && (tc->client != client))
2528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2529 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
2531 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
2533 transmit_to_peer (tc, obmm, GNUNET_NO, n);
2534 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2539 * Handle SET_QUOTA-message.
2541 * @param cls closure (always NULL)
2542 * @param client identification of the client
2543 * @param message the actual message
2546 handle_set_quota (void *cls,
2547 struct GNUNET_SERVER_Client *client,
2548 const struct GNUNET_MessageHeader *message)
2550 const struct QuotaSetMessage *qsm =
2551 (const struct QuotaSetMessage *) message;
2552 struct NeighbourList *n;
2553 struct TransportPlugin *p;
2554 struct ReadyList *rl;
2557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2558 "Received `%s' request from client for peer `%4s'\n",
2559 "SET_QUOTA", GNUNET_i2s (&qsm->peer));
2561 n = find_neighbour (&qsm->peer);
2564 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2568 if (n->quota_in < ntohl (qsm->quota_in))
2569 n->last_quota_update = GNUNET_TIME_absolute_get ();
2570 n->quota_in = ntohl (qsm->quota_in);
2575 p->api->set_receive_quota (p->api->cls,
2576 &qsm->peer, ntohl (qsm->quota_in));
2579 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2584 * Handle TRY_CONNECT-message.
2586 * @param cls closure (always NULL)
2587 * @param client identification of the client
2588 * @param message the actual message
2591 handle_try_connect (void *cls,
2592 struct GNUNET_SERVER_Client *client,
2593 const struct GNUNET_MessageHeader *message)
2595 const struct TryConnectMessage *tcm;
2597 tcm = (const struct TryConnectMessage *) message;
2599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2600 "Received `%s' request from client asking to connect to `%4s'\n",
2601 "TRY_CONNECT", GNUNET_i2s (&tcm->peer));
2603 if (NULL == find_neighbour (&tcm->peer))
2604 setup_new_neighbour (&tcm->peer);
2605 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2610 * List of handlers for the messages understood by this
2613 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2614 {&handle_start, NULL,
2615 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
2616 {&handle_hello, NULL,
2617 GNUNET_MESSAGE_TYPE_HELLO, 0},
2618 {&handle_send, NULL,
2619 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
2620 {&handle_set_quota, NULL,
2621 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
2622 {&handle_try_connect, NULL,
2623 GNUNET_MESSAGE_TYPE_TRANSPORT_TRY_CONNECT,
2624 sizeof (struct TryConnectMessage)},
2630 * Setup the environment for this plugin.
2633 create_environment (struct TransportPlugin *plug)
2635 plug->env.cfg = cfg;
2636 plug->env.sched = sched;
2637 plug->env.my_public_key = &my_public_key;
2638 plug->env.cls = plug;
2639 plug->env.receive = &plugin_env_receive;
2640 plug->env.lookup = &plugin_env_lookup_address;
2641 plug->env.notify_address = &plugin_env_notify_address;
2642 plug->env.default_quota_in = default_quota_in;
2643 plug->env.max_connections = max_connect_per_transport;
2648 * Start the specified transport (load the plugin).
2651 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
2653 struct TransportPlugin *plug;
2656 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2657 _("Loading `%s' transport plugin\n"), name);
2658 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
2659 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
2660 create_environment (plug);
2661 plug->short_name = GNUNET_strdup (name);
2662 plug->lib_name = libname;
2663 plug->next = plugins;
2665 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
2666 if (plug->api == NULL)
2668 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2669 _("Failed to load transport plugin for `%s'\n"), name);
2670 GNUNET_free (plug->short_name);
2671 plugins = plug->next;
2672 GNUNET_free (libname);
2679 * Called whenever a client is disconnected. Frees our
2680 * resources associated with that client.
2682 * @param cls closure
2683 * @param client identification of the client
2686 client_disconnect_notification (void *cls,
2687 struct GNUNET_SERVER_Client *client)
2689 struct TransportClient *pos;
2690 struct TransportClient *prev;
2691 struct ClientMessageQueueEntry *mqe;
2694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2695 "Client disconnected, cleaning up.\n");
2699 while ((pos != NULL) && (pos->client != client))
2706 while (NULL != (mqe = pos->message_queue_head))
2708 pos->message_queue_head = mqe->next;
2711 pos->message_queue_head = NULL;
2713 clients = pos->next;
2715 prev->next = pos->next;
2716 if (GNUNET_YES == pos->tcs_pending)
2726 * Initiate transport service.
2728 * @param cls closure
2729 * @param s scheduler to use
2730 * @param serv the initialized server
2731 * @param c configuration to use
2735 struct GNUNET_SCHEDULER_Handle *s,
2736 struct GNUNET_SERVER_Handle *serv, struct GNUNET_CONFIGURATION_Handle *c)
2741 unsigned long long qin;
2742 unsigned long long qout;
2743 unsigned long long tneigh;
2748 /* parse configuration */
2750 GNUNET_CONFIGURATION_get_value_number (c,
2755 GNUNET_CONFIGURATION_get_value_number (c,
2757 "DEFAULT_QUOTA_OUT",
2760 GNUNET_CONFIGURATION_get_value_number (c,
2765 GNUNET_CONFIGURATION_get_value_filename (c,
2767 "HOSTKEY", &keyfile)))
2769 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2771 ("Transport service is lacking key configuration settings. Exiting.\n"));
2772 GNUNET_SCHEDULER_shutdown (s);
2775 max_connect_per_transport = (uint32_t) tneigh;
2776 default_quota_in = (uint32_t) qin;
2777 default_quota_out = (uint32_t) qout;
2778 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
2779 GNUNET_free (keyfile);
2780 if (my_private_key == NULL)
2782 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2784 ("Transport service could not access hostkey. Exiting.\n"));
2785 GNUNET_SCHEDULER_shutdown (s);
2788 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
2789 GNUNET_CRYPTO_hash (&my_public_key,
2790 sizeof (my_public_key), &my_identity.hashPubKey);
2791 /* setup notification */
2793 GNUNET_SERVER_disconnect_notify (server,
2794 &client_disconnect_notification, NULL);
2795 /* load plugins... */
2798 GNUNET_CONFIGURATION_get_value_string (c,
2799 "TRANSPORT", "PLUGINS", &plugs))
2801 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2802 _("Starting transport plugins `%s'\n"), plugs);
2803 pos = strtok (plugs, " ");
2806 start_transport (server, pos);
2808 pos = strtok (NULL, " ");
2810 GNUNET_free (plugs);
2814 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
2815 /* process client requests */
2816 GNUNET_SERVER_add_handlers (server, handlers);
2821 * Function called when the service shuts
2822 * down. Unloads our plugins.
2824 * @param cls closure
2825 * @param cfg configuration to use
2828 unload_plugins (void *cls, struct GNUNET_CONFIGURATION_Handle *cfg)
2830 struct TransportPlugin *plug;
2831 struct AddressList *al;
2834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2835 "Transport service is unloading plugins...\n");
2837 while (NULL != (plug = plugins))
2839 plugins = plug->next;
2840 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
2841 GNUNET_free (plug->lib_name);
2842 GNUNET_free (plug->short_name);
2843 while (NULL != (al = plug->addresses))
2845 plug->addresses = al->next;
2850 if (my_private_key != NULL)
2851 GNUNET_CRYPTO_rsa_key_free (my_private_key);
2856 * The main function for the transport service.
2858 * @param argc number of arguments from the command line
2859 * @param argv command line arguments
2860 * @return 0 ok, 1 on error
2863 main (int argc, char *const *argv)
2865 return (GNUNET_OK ==
2866 GNUNET_SERVICE_run (argc,
2869 &run, NULL, &unload_plugins, NULL)) ? 0 : 1;
2872 /* end of gnunet-service-transport.c */