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 list of
309 * "addresses" and start fresh when we receive the next address
310 * update from a transport. Set to GNUNET_NO if we should just add
311 * the new address to the list and wait for the commit call.
317 struct NeighbourList;
320 * For each neighbour we keep a list of messages
321 * that we still want to transmit to the neighbour.
327 * This is a doubly linked list.
329 struct MessageQueue *next;
332 * This is a doubly linked list.
334 struct MessageQueue *prev;
337 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
338 * stuck together in memory. Allocated at the end of this struct.
340 const char *message_buf;
343 * Size of the message buf
345 size_t message_buf_size;
348 * Client responsible for queueing the message;
349 * used to check that a client has no two messages
350 * pending for the same target. Can be NULL.
352 struct TransportClient *client;
355 * Using which specific address should we send this message?
357 struct ForeignAddressList *specific_address;
360 * Peer ID of the Neighbour this entry belongs to.
362 struct GNUNET_PeerIdentity neighbour_id;
365 * Plugin that we used for the transmission.
366 * NULL until we scheduled a transmission.
368 struct TransportPlugin *plugin;
371 * At what time should we fail?
373 struct GNUNET_TIME_Absolute timeout;
376 * Internal message of the transport system that should not be
377 * included in the usual SEND-SEND_OK transmission confirmation
378 * traffic management scheme. Typically, "internal_msg" will
379 * be set whenever "client" is NULL (but it is not strictly
385 * How important is the message?
387 unsigned int priority;
393 * For a given Neighbour, which plugins are available
394 * to talk to this peer and what are their costs?
399 * This is a linked list.
401 struct ReadyList *next;
404 * Which of our transport plugins does this entry
407 struct TransportPlugin *plugin;
410 * Transport addresses, latency, and readiness for
411 * this particular plugin.
413 struct ForeignAddressList *addresses;
416 * To which neighbour does this ready list belong to?
418 struct NeighbourList *neighbour;
424 * Entry in linked list of all of our current neighbours.
430 * This is a linked list.
432 struct NeighbourList *next;
435 * Which of our transports is connected to this peer
436 * and what is their status?
438 struct ReadyList *plugins;
441 * Head of list of messages we would like to send to this peer;
442 * must contain at most one message per client.
444 struct MessageQueue *messages_head;
447 * Tail of list of messages we would like to send to this peer; must
448 * contain at most one message per client.
450 struct MessageQueue *messages_tail;
453 * Context for peerinfo iteration.
454 * NULL after we are done processing peerinfo's information.
456 struct GNUNET_PEERINFO_IteratorContext *piter;
459 * Public key for this peer. Valid only if the respective flag is set below.
461 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
464 * Identity of this neighbour.
466 struct GNUNET_PeerIdentity id;
469 * ID of task scheduled to run when this peer is about to
470 * time out (will free resources associated with the peer).
472 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
475 * ID of task scheduled to run when we should retry transmitting
476 * the head of the message queue. Actually triggered when the
477 * transmission is timing out (we trigger instantly when we have
478 * a chance of success).
480 GNUNET_SCHEDULER_TaskIdentifier retry_task;
483 * How long until we should consider this peer dead
484 * (if we don't receive another message in the
487 struct GNUNET_TIME_Absolute peer_timeout;
490 * Tracker for inbound bandwidth.
492 struct GNUNET_BANDWIDTH_Tracker in_tracker;
495 * The latency we have seen for this particular address for
496 * this particular peer. This latency may have been calculated
497 * over multiple transports. This value reflects how long it took
498 * us to receive a response when SENDING via this particular
499 * transport/neighbour/address combination!
501 * FIXME: we need to periodically send PINGs to update this
502 * latency (at least more often than the current "huge" (11h?)
505 struct GNUNET_TIME_Relative latency;
508 * How often has the other peer (recently) violated the
509 * inbound traffic limit? Incremented by 10 per violation,
510 * decremented by 1 per non-violation (for each
513 unsigned int quota_violation_count;
516 * DV distance to this peer (1 if no DV is used).
521 * Have we seen an PONG from this neighbour in the past (and
522 * not had a disconnect since)?
527 * Do we have a valid public key for this neighbour?
529 int public_key_valid;
534 * Message used to ask a peer to validate receipt (to check an address
537 struct TransportPingMessage
541 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
543 struct GNUNET_MessageHeader header;
546 * Random challenge number (in network byte order).
548 uint32_t challenge GNUNET_PACKED;
551 * Who is the intended recipient?
553 struct GNUNET_PeerIdentity target;
559 * Message used to validate a HELLO. The challenge is included in the
560 * confirmation to make matching of replies to requests possible. The
561 * signature signs the original challenge number, our public key, the
562 * sender's address (so that the sender can check that the address we
563 * saw is plausible for him and possibly detect a MiM attack) and a
564 * timestamp (to limit replay).<p>
566 * This message is followed by the address of the
567 * client that we are observing (which is part of what
570 struct TransportPongMessage
574 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
576 struct GNUNET_MessageHeader header;
579 * For padding, always zero.
581 uint32_t reserved GNUNET_PACKED;
586 struct GNUNET_CRYPTO_RsaSignature signature;
589 * What are we signing and why?
591 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
594 * Random challenge number (in network byte order).
596 uint32_t challenge GNUNET_PACKED;
599 * Who signed this message?
601 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
604 * Size of address appended to this message
612 * Linked list of messages to be transmitted to the client. Each
613 * entry is followed by the actual message.
615 struct ClientMessageQueueEntry
618 * This is a doubly-linked list.
620 struct ClientMessageQueueEntry *next;
623 * This is a doubly-linked list.
625 struct ClientMessageQueueEntry *prev;
630 * Client connected to the transport service.
632 struct TransportClient
636 * This is a linked list.
638 struct TransportClient *next;
641 * Handle to the client.
643 struct GNUNET_SERVER_Client *client;
646 * Linked list of messages yet to be transmitted to
649 struct ClientMessageQueueEntry *message_queue_head;
652 * Tail of linked list of messages yet to be transmitted to the
655 struct ClientMessageQueueEntry *message_queue_tail;
658 * Current transmit request handle.
660 struct GNUNET_CONNECTION_TransmitHandle *th;
663 * Is a call to "transmit_send_continuation" pending? If so, we
664 * must not free this struct (even if the corresponding client
665 * disconnects) and instead only remove it from the linked list and
666 * set the "client" field to NULL.
671 * Length of the list of messages pending for this client.
673 unsigned int message_count;
679 * Entry in map of all HELLOs awaiting validation.
681 struct ValidationEntry
685 * The address, actually a pointer to the end
686 * of this struct. Do not free!
691 * Name of the transport.
693 char *transport_name;
696 * The public key of the peer.
698 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
701 * ID of task that will clean up this entry if we don't succeed
702 * with the validation first.
704 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
707 * At what time did we send this validation?
709 struct GNUNET_TIME_Absolute send_time;
717 * Challenge number we used.
725 * Context of currently active requests to peerinfo
726 * for validation of HELLOs.
728 struct CheckHelloValidatedContext
732 * This is a doubly-linked list.
734 struct CheckHelloValidatedContext *next;
737 * This is a doubly-linked list.
739 struct CheckHelloValidatedContext *prev;
742 * Hello that we are validating.
744 const struct GNUNET_HELLO_Message *hello;
747 * Context for peerinfo iteration.
748 * NULL after we are done processing peerinfo's information.
750 struct GNUNET_PEERINFO_IteratorContext *piter;
753 * Was a HELLO known for this peer to peerinfo?
763 static struct GNUNET_HELLO_Message *our_hello;
766 * "version" of "our_hello". Used to see if a given neighbour has
767 * already been sent the latest version of our HELLO message.
769 static unsigned int our_hello_version;
774 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
779 static struct GNUNET_PeerIdentity my_identity;
784 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
789 struct GNUNET_SCHEDULER_Handle *sched;
794 const struct GNUNET_CONFIGURATION_Handle *cfg;
797 * Linked list of all clients to this service.
799 static struct TransportClient *clients;
802 * All loaded plugins.
804 static struct TransportPlugin *plugins;
809 static struct GNUNET_SERVER_Handle *server;
812 * All known neighbours and their HELLOs.
814 static struct NeighbourList *neighbours;
817 * Number of neighbours we'd like to have.
819 static uint32_t max_connect_per_transport;
822 * Head of linked list.
824 static struct CheckHelloValidatedContext *chvc_head;
827 * Tail of linked list.
829 static struct CheckHelloValidatedContext *chvc_tail;
832 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
833 * of the given peer that we are currently validating).
835 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
838 * Handle for reporting statistics.
840 static struct GNUNET_STATISTICS_Handle *stats;
844 * The peer specified by the given neighbour has timed-out or a plugin
845 * has disconnected. We may either need to do nothing (other plugins
846 * still up), or trigger a full disconnect and clean up. This
847 * function updates our state and do the necessary notifications.
848 * Also notifies our clients that the neighbour is now officially
851 * @param n the neighbour list entry for the peer
852 * @param check should we just check if all plugins
853 * disconnected or must we ask all plugins to
856 static void disconnect_neighbour (struct NeighbourList *n, int check);
859 * Check the ready list for the given neighbour and if a plugin is
860 * ready for transmission (and if we have a message), do so!
862 * @param neighbour target peer for which to transmit
864 static void try_transmission_to_peer (struct NeighbourList *neighbour);
868 * Find an entry in the neighbour list for a particular peer.
870 * @return NULL if not found.
872 static struct NeighbourList *
873 find_neighbour (const struct GNUNET_PeerIdentity *key)
875 struct NeighbourList *head = neighbours;
877 while ((head != NULL) &&
878 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
885 * Find an entry in the transport list for a particular transport.
887 * @return NULL if not found.
889 static struct TransportPlugin *
890 find_transport (const char *short_name)
892 struct TransportPlugin *head = plugins;
893 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
900 * Function called to notify a client about the socket being ready to
901 * queue more data. "buf" will be NULL and "size" zero if the socket
902 * was closed for writing in the meantime.
905 * @param size number of bytes available in buf
906 * @param buf where the callee should write the message
907 * @return number of bytes written to buf
910 transmit_to_client_callback (void *cls, size_t size, void *buf)
912 struct TransportClient *client = cls;
913 struct ClientMessageQueueEntry *q;
916 const struct GNUNET_MessageHeader *msg;
922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
923 "Transmission to client failed, closing connection.\n");
924 /* fatal error with client, free message queue! */
925 while (NULL != (q = client->message_queue_head))
927 GNUNET_STATISTICS_update (stats,
928 gettext_noop ("# bytes discarded (could not transmit to client)"),
929 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
931 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
932 client->message_queue_tail,
936 client->message_count = 0;
941 while (NULL != (q = client->message_queue_head))
943 msg = (const struct GNUNET_MessageHeader *) &q[1];
944 msize = ntohs (msg->size);
945 if (msize + tsize > size)
948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
949 "Transmitting message of type %u to client.\n",
952 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
953 client->message_queue_tail,
955 memcpy (&cbuf[tsize], msg, msize);
958 client->message_count--;
962 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
963 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
965 GNUNET_TIME_UNIT_FOREVER_REL,
966 &transmit_to_client_callback,
968 GNUNET_assert (client->th != NULL);
975 * Send the specified message to the specified client. Since multiple
976 * messages may be pending for the same client at a time, this code
977 * makes sure that no message is lost.
979 * @param client client to transmit the message to
980 * @param msg the message to send
981 * @param may_drop can this message be dropped if the
982 * message queue for this client is getting far too large?
985 transmit_to_client (struct TransportClient *client,
986 const struct GNUNET_MessageHeader *msg, int may_drop)
988 struct ClientMessageQueueEntry *q;
991 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
993 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
995 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
996 client->message_count, MAX_PENDING);
997 /* TODO: call to statistics... */
1000 msize = ntohs (msg->size);
1001 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1002 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1003 memcpy (&q[1], msg, msize);
1004 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1005 client->message_queue_tail,
1006 client->message_queue_tail,
1008 client->message_count++;
1009 if (client->th == NULL)
1011 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1013 GNUNET_TIME_UNIT_FOREVER_REL,
1014 &transmit_to_client_callback,
1016 GNUNET_assert (client->th != NULL);
1022 * Transmit a 'SEND_OK' notification to the given client for the
1025 * @param client who to notify
1026 * @param n neighbour to notify about
1027 * @param result status code for the transmission request
1030 transmit_send_ok (struct TransportClient *client,
1031 struct NeighbourList *n,
1034 struct SendOkMessage send_ok_msg;
1036 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1037 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1038 send_ok_msg.success = htonl (result);
1039 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1040 send_ok_msg.peer = n->id;
1041 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1046 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1047 * upon "completion" of a send request. This tells the API
1048 * that it is now legal to send another message to the given
1051 * @param cls closure, identifies the entry on the
1052 * message queue that was transmitted and the
1053 * client responsible for queueing the message
1054 * @param target the peer receiving the message
1055 * @param result GNUNET_OK on success, if the transmission
1056 * failed, we should not tell the client to transmit
1060 transmit_send_continuation (void *cls,
1061 const struct GNUNET_PeerIdentity *target,
1064 struct MessageQueue *mq = cls;
1065 struct NeighbourList *n;
1067 GNUNET_STATISTICS_update (stats,
1068 gettext_noop ("# bytes pending with plugins"),
1069 - (int64_t) mq->message_buf_size,
1071 if (result == GNUNET_OK)
1073 GNUNET_STATISTICS_update (stats,
1074 gettext_noop ("# bytes successfully transmitted by plugins"),
1075 mq->message_buf_size,
1080 GNUNET_STATISTICS_update (stats,
1081 gettext_noop ("# bytes with transmission failure by plugins"),
1082 mq->message_buf_size,
1085 n = find_neighbour(&mq->neighbour_id);
1086 GNUNET_assert (n != NULL);
1087 if (mq->specific_address != NULL)
1089 if (result == GNUNET_OK)
1091 mq->specific_address->timeout =
1092 GNUNET_TIME_relative_to_absolute
1093 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1094 if (mq->specific_address->connected != GNUNET_YES)
1096 GNUNET_STATISTICS_update (stats,
1097 gettext_noop ("# connected addresses"),
1100 mq->specific_address->connected = GNUNET_YES;
1105 if (mq->specific_address->connected != GNUNET_NO)
1107 GNUNET_STATISTICS_update (stats,
1108 gettext_noop ("# connected addresses"),
1111 mq->specific_address->connected = GNUNET_NO;
1114 if (! mq->internal_msg)
1115 mq->specific_address->in_transmit = GNUNET_NO;
1117 if (mq->client != NULL)
1118 transmit_send_ok (mq->client, n, result);
1120 try_transmission_to_peer (n);
1125 * Find an address in any of the available transports for
1126 * the given neighbour that would be good for message
1127 * transmission. This is essentially the transport selection
1130 * @param neighbour for whom to select an address
1131 * @return selected address, NULL if we have none
1133 struct ForeignAddressList *
1134 find_ready_address(struct NeighbourList *neighbour)
1136 struct ReadyList *head = neighbour->plugins;
1137 struct ForeignAddressList *addresses;
1138 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1139 struct ForeignAddressList *best_address;
1141 best_address = NULL;
1142 while (head != NULL)
1144 addresses = head->addresses;
1145 while (addresses != NULL)
1147 if ( (addresses->timeout.value < now.value) &&
1148 (addresses->connected == GNUNET_YES) )
1151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1152 "Marking long-time inactive connection to `%4s' as down.\n",
1153 GNUNET_i2s (&neighbour->id));
1155 GNUNET_STATISTICS_update (stats,
1156 gettext_noop ("# connected addresses"),
1159 addresses->connected = GNUNET_NO;
1161 addresses = addresses->next;
1164 addresses = head->addresses;
1165 while (addresses != NULL)
1167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1168 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1169 GNUNET_a2s (addresses->addr,
1170 addresses->addrlen),
1171 GNUNET_i2s (&neighbour->id),
1172 addresses->connected,
1173 addresses->in_transmit,
1174 addresses->validated,
1175 addresses->connect_attempts,
1176 (unsigned long long) addresses->timeout.value,
1177 (unsigned int) addresses->distance);
1178 if ( ( (best_address == NULL) ||
1179 (addresses->connected == GNUNET_YES) ||
1180 (best_address->connected == GNUNET_NO) ) &&
1181 (addresses->in_transmit == GNUNET_NO) &&
1182 ( (best_address == NULL) ||
1183 (addresses->latency.value < best_address->latency.value)) )
1184 best_address = addresses;
1185 /* FIXME: also give lower-latency addresses that are not
1186 connected a chance some times... */
1187 addresses = addresses->next;
1191 if (best_address != NULL)
1194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1195 "Best address found has latency of %llu ms.\n",
1196 best_address->latency.value);
1201 GNUNET_STATISTICS_update (stats,
1202 gettext_noop ("# transmission attempts failed (no address)"),
1206 return best_address;
1212 * We should re-try transmitting to the given peer,
1213 * hopefully we've learned something in the meantime.
1216 retry_transmission_task (void *cls,
1217 const struct GNUNET_SCHEDULER_TaskContext *tc)
1219 struct NeighbourList *n = cls;
1221 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1222 try_transmission_to_peer (n);
1227 * Check the ready list for the given neighbour and if a plugin is
1228 * ready for transmission (and if we have a message), do so!
1230 * @param neighbour target peer for which to transmit
1233 try_transmission_to_peer (struct NeighbourList *neighbour)
1235 struct ReadyList *rl;
1236 struct MessageQueue *mq;
1237 struct GNUNET_TIME_Relative timeout;
1241 if (neighbour->messages_head == NULL)
1243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1244 "Transmission queue for `%4s' is empty\n",
1245 GNUNET_i2s (&neighbour->id));
1246 return; /* nothing to do */
1249 mq = neighbour->messages_head;
1250 /* FIXME: support bi-directional use of TCP */
1251 force_address = GNUNET_YES;
1252 if (mq->specific_address == NULL)
1254 mq->specific_address = find_ready_address(neighbour);
1255 GNUNET_STATISTICS_update (stats,
1256 gettext_noop ("# transport selected peer address freely"),
1259 force_address = GNUNET_NO;
1261 if (mq->specific_address == NULL)
1263 GNUNET_STATISTICS_update (stats,
1264 gettext_noop ("# transport failed to selected peer address"),
1267 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1268 if (timeout.value == 0)
1271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1272 "No destination address available to transmit message of size %u to peer `%4s'\n",
1273 mq->message_buf_size,
1274 GNUNET_i2s (&mq->neighbour_id));
1276 GNUNET_STATISTICS_update (stats,
1277 gettext_noop ("# bytes in message queue for other peers"),
1278 - (int64_t) mq->message_buf_size,
1280 GNUNET_STATISTICS_update (stats,
1281 gettext_noop ("# bytes discarded (no destination address available)"),
1282 mq->message_buf_size,
1284 if (mq->client != NULL)
1285 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1286 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1287 neighbour->messages_tail,
1290 return; /* nobody ready */
1292 GNUNET_STATISTICS_update (stats,
1293 gettext_noop ("# message delivery deferred (no address)"),
1296 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1297 GNUNET_SCHEDULER_cancel (sched,
1298 neighbour->retry_task);
1299 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1301 &retry_transmission_task,
1304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1305 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1306 mq->message_buf_size,
1307 GNUNET_i2s (&mq->neighbour_id),
1310 /* FIXME: might want to trigger peerinfo lookup here
1311 (unless that's already pending...) */
1314 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1315 neighbour->messages_tail,
1317 if (mq->specific_address->connected == GNUNET_NO)
1318 mq->specific_address->connect_attempts++;
1319 rl = mq->specific_address->ready_list;
1320 mq->plugin = rl->plugin;
1321 if (!mq->internal_msg)
1322 mq->specific_address->in_transmit = GNUNET_YES;
1324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1325 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1326 mq->message_buf_size,
1327 GNUNET_i2s (&neighbour->id),
1328 GNUNET_a2s (mq->specific_address->addr,
1329 mq->specific_address->addrlen),
1330 rl->plugin->short_name);
1332 GNUNET_STATISTICS_update (stats,
1333 gettext_noop ("# bytes in message queue for other peers"),
1334 - (int64_t) mq->message_buf_size,
1336 GNUNET_STATISTICS_update (stats,
1337 gettext_noop ("# bytes pending with plugins"),
1338 mq->message_buf_size,
1340 ret = rl->plugin->api->send (rl->plugin->api->cls,
1343 mq->message_buf_size,
1345 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1346 mq->specific_address->addr,
1347 mq->specific_address->addrlen,
1349 &transmit_send_continuation, mq);
1352 /* failure, but 'send' would not call continuation in this case,
1353 so we need to do it here! */
1354 transmit_send_continuation (mq,
1362 * Send the specified message to the specified peer.
1364 * @param client source of the transmission request (can be NULL)
1365 * @param peer_address ForeignAddressList where we should send this message
1366 * @param priority how important is the message
1367 * @param timeout how long do we have to transmit?
1368 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1369 * @param message_buf_size total size of all messages in message_buf
1370 * @param is_internal is this an internal message; these are pre-pended and
1371 * also do not count for plugins being "ready" to transmit
1372 * @param neighbour handle to the neighbour for transmission
1375 transmit_to_peer (struct TransportClient *client,
1376 struct ForeignAddressList *peer_address,
1377 unsigned int priority,
1378 struct GNUNET_TIME_Relative timeout,
1379 const char *message_buf,
1380 size_t message_buf_size,
1381 int is_internal, struct NeighbourList *neighbour)
1383 struct MessageQueue *mq;
1388 /* check for duplicate submission */
1389 mq = neighbour->messages_head;
1392 if (mq->client == client)
1394 /* client transmitted to same peer twice
1395 before getting SEND_OK! */
1403 GNUNET_STATISTICS_update (stats,
1404 gettext_noop ("# bytes in message queue for other peers"),
1407 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1408 mq->specific_address = peer_address;
1409 mq->client = client;
1410 memcpy (&mq[1], message_buf, message_buf_size);
1411 mq->message_buf = (const char*) &mq[1];
1412 mq->message_buf_size = message_buf_size;
1413 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1414 mq->internal_msg = is_internal;
1415 mq->priority = priority;
1416 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1418 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1419 neighbour->messages_tail,
1422 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1423 neighbour->messages_tail,
1424 neighbour->messages_tail,
1426 try_transmission_to_peer (neighbour);
1433 struct GeneratorContext
1435 struct TransportPlugin *plug_pos;
1436 struct OwnAddressList *addr_pos;
1437 struct GNUNET_TIME_Absolute expiration;
1445 address_generator (void *cls, size_t max, void *buf)
1447 struct GeneratorContext *gc = cls;
1450 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1452 gc->plug_pos = gc->plug_pos->next;
1453 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1455 if (NULL == gc->plug_pos)
1460 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1463 gc->addr_pos->addrlen, buf, max);
1464 gc->addr_pos = gc->addr_pos->next;
1470 * Construct our HELLO message from all of the addresses of
1471 * all of the transports.
1476 struct GNUNET_HELLO_Message *hello;
1477 struct TransportClient *cpos;
1478 struct NeighbourList *npos;
1479 struct GeneratorContext gc;
1481 gc.plug_pos = plugins;
1482 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1483 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1484 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1487 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1489 GNUNET_STATISTICS_update (stats,
1490 gettext_noop ("# refreshed my HELLO"),
1494 while (cpos != NULL)
1496 transmit_to_client (cpos,
1497 (const struct GNUNET_MessageHeader *) hello,
1502 GNUNET_free_non_null (our_hello);
1504 our_hello_version++;
1505 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1507 while (npos != NULL)
1510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1511 "Transmitting updated `%s' to neighbour `%4s'\n",
1512 "HELLO", GNUNET_i2s (&npos->id));
1514 GNUNET_STATISTICS_update (stats,
1515 gettext_noop ("# transmitted my HELLO to other peers"),
1518 transmit_to_peer (NULL, NULL, 0,
1519 HELLO_ADDRESS_EXPIRATION,
1520 (const char *) our_hello,
1521 GNUNET_HELLO_size(our_hello),
1529 * Task used to clean up expired addresses for a plugin.
1531 * @param cls closure
1535 expire_address_task (void *cls,
1536 const struct GNUNET_SCHEDULER_TaskContext *tc);
1540 * Update the list of addresses for this plugin,
1541 * expiring those that are past their expiration date.
1543 * @param plugin addresses of which plugin should be recomputed?
1544 * @param fresh set to GNUNET_YES if a new address was added
1545 * and we need to regenerate the HELLO even if nobody
1549 update_addresses (struct TransportPlugin *plugin, int fresh)
1551 struct GNUNET_TIME_Relative min_remaining;
1552 struct GNUNET_TIME_Relative remaining;
1553 struct GNUNET_TIME_Absolute now;
1554 struct OwnAddressList *pos;
1555 struct OwnAddressList *prev;
1556 struct OwnAddressList *next;
1559 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1560 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1561 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1562 now = GNUNET_TIME_absolute_get ();
1563 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1564 expired = GNUNET_NO;
1566 pos = plugin->addresses;
1570 if (pos->expires.value < now.value)
1572 expired = GNUNET_YES;
1574 plugin->addresses = pos->next;
1576 prev->next = pos->next;
1583 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1584 if (remaining.value < min_remaining.value)
1585 min_remaining = remaining;
1591 if (expired || fresh)
1593 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1594 plugin->address_update_task
1595 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1597 &expire_address_task, plugin);
1603 * Task used to clean up expired addresses for a plugin.
1605 * @param cls closure
1609 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1611 struct TransportPlugin *plugin = cls;
1612 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1613 update_addresses (plugin, GNUNET_NO);
1618 * Function that must be called by each plugin to notify the
1619 * transport service about the addresses under which the transport
1620 * provided by the plugin can be reached.
1622 * @param cls closure
1623 * @param name name of the transport that generated the address
1624 * @param addr one of the addresses of the host, NULL for the last address
1625 * the specific address format depends on the transport
1626 * @param addrlen length of the address
1627 * @param expires when should this address automatically expire?
1630 plugin_env_notify_address (void *cls,
1634 struct GNUNET_TIME_Relative expires)
1636 struct TransportPlugin *p = cls;
1637 struct OwnAddressList *al;
1638 struct GNUNET_TIME_Absolute abex;
1640 abex = GNUNET_TIME_relative_to_absolute (expires);
1641 GNUNET_assert (p == find_transport (name));
1646 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1648 if (al->expires.value < abex.value)
1655 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
1657 al->next = p->addresses;
1660 al->addrlen = addrlen;
1661 memcpy (&al[1], addr, addrlen);
1662 update_addresses (p, GNUNET_YES);
1667 * Notify all of our clients about a peer connecting.
1670 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1671 struct GNUNET_TIME_Relative latency,
1674 struct ConnectInfoMessage cim;
1675 struct TransportClient *cpos;
1678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1679 "Notifying clients about connection from `%s'\n",
1682 GNUNET_STATISTICS_update (stats,
1683 gettext_noop ("# peers connected"),
1686 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1687 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1688 cim.distance = htonl (distance);
1689 cim.latency = GNUNET_TIME_relative_hton (latency);
1690 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1692 while (cpos != NULL)
1694 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1701 * Notify all of our clients about a peer disconnecting.
1704 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1706 struct DisconnectInfoMessage dim;
1707 struct TransportClient *cpos;
1710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1711 "Notifying clients about lost connection to `%s'\n",
1714 GNUNET_STATISTICS_update (stats,
1715 gettext_noop ("# peers connected"),
1718 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1719 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1720 dim.reserved = htonl (0);
1721 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1723 while (cpos != NULL)
1725 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1732 * Find a ForeignAddressList entry for the given neighbour
1733 * that matches the given address and transport.
1735 * @param neighbour which peer we care about
1736 * @param tname name of the transport plugin
1737 * @param addr binary address
1738 * @param addrlen length of addr
1739 * @return NULL if no such entry exists
1741 static struct ForeignAddressList *
1742 find_peer_address(struct NeighbourList *neighbour,
1747 struct ReadyList *head;
1748 struct ForeignAddressList *address_head;
1750 head = neighbour->plugins;
1751 while (head != NULL)
1753 if (0 == strcmp (tname, head->plugin->short_name))
1760 address_head = head->addresses;
1761 while ( (address_head != NULL) &&
1762 ( (address_head->addrlen != addrlen) ||
1763 (memcmp(address_head->addr, addr, addrlen) != 0) ) )
1764 address_head = address_head->next;
1765 return address_head;
1770 * Get the peer address struct for the given neighbour and
1771 * address. If it doesn't yet exist, create it.
1773 * @param neighbour which peer we care about
1774 * @param tname name of the transport plugin
1775 * @param addr binary address
1776 * @param addrlen length of addr
1777 * @return NULL if we do not have a transport plugin for 'tname'
1779 static struct ForeignAddressList *
1780 add_peer_address (struct NeighbourList *neighbour,
1785 struct ReadyList *head;
1786 struct ForeignAddressList *ret;
1788 ret = find_peer_address (neighbour, tname, addr, addrlen);
1791 head = neighbour->plugins;
1792 while (head != NULL)
1794 if (0 == strcmp (tname, head->plugin->short_name))
1800 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
1801 ret->addr = (const char*) &ret[1];
1802 memcpy (&ret[1], addr, addrlen);
1803 ret->addrlen = addrlen;
1804 ret->expires = GNUNET_TIME_relative_to_absolute
1805 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1806 ret->latency = GNUNET_TIME_relative_get_forever();
1808 ret->timeout = GNUNET_TIME_relative_to_absolute
1809 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1810 ret->ready_list = head;
1811 ret->next = head->addresses;
1812 head->addresses = ret;
1818 * Closure for 'add_validated_address'.
1820 struct AddValidatedAddressContext
1823 * Entry that has been validated.
1825 const struct ValidationEntry *ve;
1828 * Flag set after we have added the address so
1829 * that we terminate the iteration next time.
1836 * Callback function used to fill a buffer of max bytes with a list of
1837 * addresses in the format used by HELLOs. Should use
1838 * "GNUNET_HELLO_add_address" as a helper function.
1840 * @param cls the 'struct AddValidatedAddressContext' with the validated address
1841 * @param max maximum number of bytes that can be written to buf
1842 * @param buf where to write the address information
1843 * @return number of bytes written, 0 to signal the
1844 * end of the iteration.
1847 add_validated_address (void *cls,
1848 size_t max, void *buf)
1850 struct AddValidatedAddressContext *avac = cls;
1851 const struct ValidationEntry *ve = avac->ve;
1853 if (GNUNET_YES == avac->done)
1855 avac->done = GNUNET_YES;
1856 return GNUNET_HELLO_add_address (ve->transport_name,
1857 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
1867 * Closure for 'check_address_exists'.
1869 struct CheckAddressExistsClosure
1872 * Address to check for.
1877 * Name of the transport.
1887 * Set to GNUNET_YES if the address exists.
1894 * Iterator over hash map entries. Checks if the given
1895 * validation entry is for the same address as what is given
1898 * @param cls the 'struct CheckAddressExistsClosure*'
1899 * @param key current key code (ignored)
1900 * @param value value in the hash map ('struct ValidationEntry')
1901 * @return GNUNET_YES if we should continue to
1902 * iterate (mismatch), GNUNET_NO if not (entry matched)
1905 check_address_exists (void *cls,
1906 const GNUNET_HashCode * key,
1909 struct CheckAddressExistsClosure *caec = cls;
1910 struct ValidationEntry *ve = value;
1911 if ( (0 == strcmp (caec->tname,
1912 ve->transport_name)) &&
1913 (caec->addrlen == ve->addrlen) &&
1914 (0 == memcmp (caec->addr,
1918 caec->exists = GNUNET_YES;
1926 * HELLO validation cleanup task (validation failed).
1928 * @param cls the 'struct ValidationEntry' that failed
1929 * @param tc scheduler context (unused)
1932 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1934 struct ValidationEntry *va = cls;
1935 struct GNUNET_PeerIdentity pid;
1937 GNUNET_STATISTICS_update (stats,
1938 gettext_noop ("# address validation timeouts"),
1941 GNUNET_CRYPTO_hash (&va->publicKey,
1943 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1945 GNUNET_CONTAINER_multihashmap_remove (validation_map,
1948 GNUNET_free (va->transport_name);
1954 neighbour_timeout_task (void *cls,
1955 const struct GNUNET_SCHEDULER_TaskContext *tc)
1957 struct NeighbourList *n = cls;
1960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1961 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1963 GNUNET_STATISTICS_update (stats,
1964 gettext_noop ("# disconnects due to timeout"),
1967 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1968 disconnect_neighbour (n, GNUNET_NO);
1973 * Schedule the job that will cause us to send a PING to the
1974 * foreign address to evaluate its validity and latency.
1976 * @param fal address to PING
1979 schedule_next_ping (struct ForeignAddressList *fal);
1983 * Add the given address to the list of foreign addresses
1984 * available for the given peer (check for duplicates).
1986 * @param cls the respective 'struct NeighbourList' to update
1987 * @param tname name of the transport
1988 * @param expiration expiration time
1989 * @param addr the address
1990 * @param addrlen length of the address
1991 * @return GNUNET_OK (always)
1994 add_to_foreign_address_list (void *cls,
1996 struct GNUNET_TIME_Absolute expiration,
1997 const void *addr, size_t addrlen)
1999 struct NeighbourList *n = cls;
2000 struct ForeignAddressList *fal;
2003 GNUNET_STATISTICS_update (stats,
2004 gettext_noop ("# valid peer addresses returned by peerinfo"),
2008 fal = find_peer_address (n, tname, addr, addrlen);
2012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2013 "Adding address `%s' (%s) for peer `%4s' due to peerinfo data for %llums.\n",
2014 GNUNET_a2s (addr, addrlen),
2016 GNUNET_i2s (&n->id),
2019 fal = add_peer_address (n, tname, addr, addrlen);
2022 GNUNET_STATISTICS_update (stats,
2023 gettext_noop ("# previously validated addresses lacking transport"),
2029 fal->expires = GNUNET_TIME_absolute_max (expiration,
2031 schedule_next_ping (fal);
2037 fal->expires = GNUNET_TIME_absolute_max (expiration,
2042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2043 "Failed to add new address for `%4s'\n",
2044 GNUNET_i2s (&n->id));
2047 if (fal->validated == GNUNET_NO)
2049 fal->validated = GNUNET_YES;
2050 GNUNET_STATISTICS_update (stats,
2051 gettext_noop ("# peer addresses considered valid"),
2055 if (try == GNUNET_YES)
2057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2058 "Have new addresses, will try to trigger transmissions.\n");
2059 try_transmission_to_peer (n);
2066 * Add addresses in validated HELLO "h" to the set of addresses
2067 * we have for this peer.
2069 * @param cls closure ('struct NeighbourList*')
2070 * @param peer id of the peer, NULL for last call
2071 * @param h hello message for the peer (can be NULL)
2072 * @param trust amount of trust we have in the peer (not used)
2075 add_hello_for_peer (void *cls,
2076 const struct GNUNET_PeerIdentity *peer,
2077 const struct GNUNET_HELLO_Message *h,
2080 struct NeighbourList *n = cls;
2088 return; /* no HELLO available */
2090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2091 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2095 if (GNUNET_YES != n->public_key_valid)
2097 GNUNET_HELLO_get_key (h, &n->publicKey);
2098 n->public_key_valid = GNUNET_YES;
2100 GNUNET_HELLO_iterate_addresses (h,
2102 &add_to_foreign_address_list,
2108 * Create a fresh entry in our neighbour list for the given peer.
2109 * Will try to transmit our current HELLO to the new neighbour.
2111 * @param peer the peer for which we create the entry
2112 * @return the new neighbour list entry
2114 static struct NeighbourList *
2115 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer)
2117 struct NeighbourList *n;
2118 struct TransportPlugin *tp;
2119 struct ReadyList *rl;
2121 GNUNET_assert (our_hello != NULL);
2122 GNUNET_STATISTICS_update (stats,
2123 gettext_noop ("# active neighbours"),
2126 n = GNUNET_malloc (sizeof (struct NeighbourList));
2127 n->next = neighbours;
2131 GNUNET_TIME_relative_to_absolute
2132 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2133 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2134 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2135 MAX_BANDWIDTH_CARRY_S);
2139 if (tp->api->send != NULL)
2141 rl = GNUNET_malloc (sizeof (struct ReadyList));
2143 rl->next = n->plugins;
2146 rl->addresses = NULL;
2150 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2152 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2153 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2154 &neighbour_timeout_task, n);
2155 n->piter = GNUNET_PEERINFO_iterate (cfg, sched, peer,
2156 0, GNUNET_TIME_UNIT_FOREVER_REL,
2157 &add_hello_for_peer, n);
2158 transmit_to_peer (NULL, NULL, 0,
2159 HELLO_ADDRESS_EXPIRATION,
2160 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2167 * Send periodic PING messages to a give foreign address.
2169 * @param cls our 'struct PeriodicValidationContext*'
2170 * @param tc task context
2173 send_periodic_ping (void *cls,
2174 const struct GNUNET_SCHEDULER_TaskContext *tc)
2176 struct ForeignAddressList *peer_address = cls;
2177 struct TransportPlugin *tp;
2178 struct ValidationEntry *va;
2179 struct NeighbourList *neighbour;
2180 struct TransportPingMessage ping;
2181 struct CheckAddressExistsClosure caec;
2183 uint16_t hello_size;
2186 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2187 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2189 tp = peer_address->ready_list->plugin;
2190 neighbour = peer_address->ready_list->neighbour;
2191 if (GNUNET_YES != neighbour->public_key_valid)
2193 /* no public key yet, try again later */
2194 schedule_next_ping (peer_address);
2197 caec.addr = peer_address->addr;
2198 caec.addrlen = peer_address->addrlen;
2199 caec.tname = tp->short_name;
2200 caec.exists = GNUNET_NO;
2201 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2202 &check_address_exists,
2204 if (caec.exists == GNUNET_YES)
2206 /* During validation attempts we will likely trigger the other
2207 peer trying to validate our address which in turn will cause
2208 it to send us its HELLO, so we expect to hit this case rather
2209 frequently. Only print something if we are very verbose. */
2210 #if DEBUG_TRANSPORT > 1
2211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2212 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2213 GNUNET_a2s (peer_address->addr,
2214 peer_address->addrlen),
2216 GNUNET_i2s (&neighbour->id));
2218 schedule_next_ping (peer_address);
2221 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
2222 va->transport_name = GNUNET_strdup (tp->short_name);
2223 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2225 va->send_time = GNUNET_TIME_absolute_get();
2226 va->addr = (const void*) &va[1];
2227 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
2228 va->addrlen = peer_address->addrlen;
2230 memcpy(&va->publicKey,
2231 &neighbour->publicKey,
2232 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2234 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2235 HELLO_VERIFICATION_TIMEOUT,
2236 &timeout_hello_validation,
2238 GNUNET_CONTAINER_multihashmap_put (validation_map,
2239 &neighbour->id.hashPubKey,
2241 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2242 hello_size = GNUNET_HELLO_size(our_hello);
2243 tsize = sizeof(struct TransportPingMessage) + hello_size;
2244 message_buf = GNUNET_malloc(tsize);
2245 ping.challenge = htonl(va->challenge);
2246 ping.header.size = htons(sizeof(struct TransportPingMessage));
2247 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2248 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
2249 memcpy(message_buf, our_hello, hello_size);
2250 memcpy(&message_buf[hello_size],
2252 sizeof(struct TransportPingMessage));
2253 #if DEBUG_TRANSPORT_REVALIDATION
2254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2255 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2256 GNUNET_a2s (peer_address->addr,
2257 peer_address->addrlen),
2259 GNUNET_i2s (&neighbour->id),
2260 "HELLO", hello_size,
2261 "PING", sizeof (struct TransportPingMessage));
2263 GNUNET_STATISTICS_update (stats,
2264 gettext_noop ("# PING messages sent for re-validation"),
2267 transmit_to_peer (NULL, peer_address,
2268 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2269 HELLO_VERIFICATION_TIMEOUT,
2271 GNUNET_YES, neighbour);
2272 GNUNET_free(message_buf);
2273 schedule_next_ping (peer_address);
2278 * Schedule the job that will cause us to send a PING to the
2279 * foreign address to evaluate its validity and latency.
2281 * @param fal address to PING
2284 schedule_next_ping (struct ForeignAddressList *fal)
2286 struct GNUNET_TIME_Relative delay;
2288 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
2290 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
2291 delay.value /= 2; /* do before expiration */
2292 delay = GNUNET_TIME_relative_min (delay,
2293 LATENCY_EVALUATION_MAX_DELAY);
2294 if (GNUNET_YES != fal->estimated)
2296 delay = GNUNET_TIME_UNIT_ZERO;
2297 fal->estimated = GNUNET_YES;
2299 if (GNUNET_YES == fal->connected)
2301 delay = GNUNET_TIME_relative_min (delay,
2302 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
2304 /* FIXME: also adjust delay based on how close the last
2305 observed latency is to the latency of the best alternative */
2306 /* bound how fast we can go */
2307 delay = GNUNET_TIME_relative_max (delay,
2308 GNUNET_TIME_UNIT_SECONDS);
2309 /* randomize a bit (to avoid doing all at the same time) */
2310 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
2311 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
2313 &send_periodic_ping,
2319 * Iterator over hash map entries. Checks if the given validation
2320 * entry is for the same challenge as what is given in the PONG.
2322 * @param cls the 'struct TransportPongMessage*'
2323 * @param key peer identity
2324 * @param value value in the hash map ('struct ValidationEntry')
2325 * @return GNUNET_YES if we should continue to
2326 * iterate (mismatch), GNUNET_NO if not (entry matched)
2329 check_pending_validation (void *cls,
2330 const GNUNET_HashCode * key,
2333 const struct TransportPongMessage *pong = cls;
2334 struct ValidationEntry *ve = value;
2335 struct AddValidatedAddressContext avac;
2336 unsigned int challenge = ntohl(pong->challenge);
2337 struct GNUNET_HELLO_Message *hello;
2338 struct GNUNET_PeerIdentity target;
2339 struct NeighbourList *n;
2340 struct ForeignAddressList *fal;
2342 if (ve->challenge != challenge)
2346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2347 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
2349 GNUNET_a2s ((const struct sockaddr *) ve->addr,
2351 ve->transport_name);
2353 GNUNET_STATISTICS_update (stats,
2354 gettext_noop ("# address validation successes"),
2357 /* create the updated HELLO */
2358 GNUNET_CRYPTO_hash (&ve->publicKey,
2359 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2360 &target.hashPubKey);
2361 avac.done = GNUNET_NO;
2363 hello = GNUNET_HELLO_create (&ve->publicKey,
2364 &add_validated_address,
2366 GNUNET_PEERINFO_add_peer (cfg, sched,
2369 GNUNET_free (hello);
2370 n = find_neighbour (&target);
2373 n->publicKey = ve->publicKey;
2374 n->public_key_valid = GNUNET_YES;
2375 fal = add_peer_address (n,
2379 GNUNET_assert (fal != NULL);
2380 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
2381 fal->validated = GNUNET_YES;
2382 GNUNET_STATISTICS_update (stats,
2383 gettext_noop ("# peer addresses considered valid"),
2386 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
2387 schedule_next_ping (fal);
2388 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
2389 n->latency = fal->latency;
2391 n->latency.value = (fal->latency.value + n->latency.value) / 2;
2392 n->distance = fal->distance;
2393 if (GNUNET_NO == n->received_pong)
2395 notify_clients_connect (&target, n->latency, n->distance);
2396 n->received_pong = GNUNET_YES;
2398 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2400 GNUNET_SCHEDULER_cancel (sched,
2402 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2403 try_transmission_to_peer (n);
2407 /* clean up validation entry */
2408 GNUNET_assert (GNUNET_YES ==
2409 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2412 GNUNET_SCHEDULER_cancel (sched,
2414 GNUNET_free (ve->transport_name);
2421 * Function that will be called if we receive a validation
2422 * of an address challenge that we transmitted to another
2423 * peer. Note that the validation should only be considered
2424 * acceptable if the challenge matches AND if the sender
2425 * address is at least a plausible address for this peer
2426 * (otherwise we may be seeing a MiM attack).
2428 * @param cls closure
2429 * @param message the pong message
2430 * @param peer who responded to our challenge
2431 * @param sender_address string describing our sender address (as observed
2432 * by the other peer in binary format)
2433 * @param sender_address_len number of bytes in 'sender_address'
2436 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
2437 const struct GNUNET_PeerIdentity *peer,
2438 const char *sender_address,
2439 size_t sender_address_len)
2441 #if DEBUG_TRANSPORT > 1
2442 /* we get tons of these that just get discarded, only log
2443 if we are quite verbose */
2444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2445 "Receiving `%s' message from `%4s'.\n", "PONG",
2448 GNUNET_STATISTICS_update (stats,
2449 gettext_noop ("# PONG messages received"),
2452 if (GNUNET_SYSERR !=
2453 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
2455 &check_pending_validation,
2458 /* This is *expected* to happen a lot since we send
2459 PONGs to *all* known addresses of the sender of
2460 the PING, so most likely we get multiple PONGs
2461 per PING, and all but the first PONG will end up
2462 here. So really we should not print anything here
2463 unless we want to be very, very verbose... */
2464 #if DEBUG_TRANSPORT > 2
2465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2466 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
2475 /* FIXME: add given address to potential pool of our addresses
2477 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
2478 _("Another peer saw us using the address `%s' via `%s'.\n"),
2479 GNUNET_a2s ((const struct sockaddr *) &pong[1],
2480 ntohs(pong->addrlen)),
2481 va->transport_name);
2487 * Check if the given address is already being validated; if not,
2488 * append the given address to the list of entries that are being be
2489 * validated and initiate validation.
2491 * @param cls closure ('struct CheckHelloValidatedContext *')
2492 * @param tname name of the transport
2493 * @param expiration expiration time
2494 * @param addr the address
2495 * @param addrlen length of the address
2496 * @return GNUNET_OK (always)
2499 run_validation (void *cls,
2501 struct GNUNET_TIME_Absolute expiration,
2502 const void *addr, size_t addrlen)
2504 struct CheckHelloValidatedContext *chvc = cls;
2505 struct GNUNET_PeerIdentity id;
2506 struct TransportPlugin *tp;
2507 struct ValidationEntry *va;
2508 struct NeighbourList *neighbour;
2509 struct ForeignAddressList *peer_address;
2510 struct TransportPingMessage ping;
2511 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2512 struct CheckAddressExistsClosure caec;
2514 uint16_t hello_size;
2517 GNUNET_STATISTICS_update (stats,
2518 gettext_noop ("# peer addresses scheduled for validation"),
2521 tp = find_transport (tname);
2524 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2525 GNUNET_ERROR_TYPE_BULK,
2527 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2529 GNUNET_STATISTICS_update (stats,
2530 gettext_noop ("# peer addresses not validated (no applicable transport plugin available)"),
2535 GNUNET_HELLO_get_key (chvc->hello, &pk);
2536 GNUNET_CRYPTO_hash (&pk,
2538 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2541 caec.addrlen = addrlen;
2543 caec.exists = GNUNET_NO;
2544 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2545 &check_address_exists,
2547 if (caec.exists == GNUNET_YES)
2549 /* During validation attempts we will likely trigger the other
2550 peer trying to validate our address which in turn will cause
2551 it to send us its HELLO, so we expect to hit this case rather
2552 frequently. Only print something if we are very verbose. */
2553 #if DEBUG_TRANSPORT > 1
2554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2555 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2556 GNUNET_a2s (addr, addrlen),
2560 GNUNET_STATISTICS_update (stats,
2561 gettext_noop ("# peer addresses not validated (in progress)"),
2566 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2567 va->transport_name = GNUNET_strdup (tname);
2568 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2570 va->send_time = GNUNET_TIME_absolute_get();
2571 va->addr = (const void*) &va[1];
2572 memcpy (&va[1], addr, addrlen);
2573 va->addrlen = addrlen;
2574 GNUNET_HELLO_get_key (chvc->hello,
2576 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2577 HELLO_VERIFICATION_TIMEOUT,
2578 &timeout_hello_validation,
2580 GNUNET_CONTAINER_multihashmap_put (validation_map,
2583 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2584 neighbour = find_neighbour(&id);
2585 if (neighbour == NULL)
2586 neighbour = setup_new_neighbour(&id);
2587 neighbour->publicKey = va->publicKey;
2588 neighbour->public_key_valid = GNUNET_YES;
2589 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2590 GNUNET_assert(peer_address != NULL);
2591 hello_size = GNUNET_HELLO_size(our_hello);
2592 tsize = sizeof(struct TransportPingMessage) + hello_size;
2593 message_buf = GNUNET_malloc(tsize);
2594 ping.challenge = htonl(va->challenge);
2595 ping.header.size = htons(sizeof(struct TransportPingMessage));
2596 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2597 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2598 memcpy(message_buf, our_hello, hello_size);
2599 memcpy(&message_buf[hello_size],
2601 sizeof(struct TransportPingMessage));
2603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2604 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2605 GNUNET_a2s (addr, addrlen),
2608 "HELLO", hello_size,
2609 "PING", sizeof (struct TransportPingMessage));
2611 GNUNET_STATISTICS_update (stats,
2612 gettext_noop ("# PING messages sent for initial validation"),
2615 transmit_to_peer (NULL, peer_address,
2616 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2617 HELLO_VERIFICATION_TIMEOUT,
2619 GNUNET_YES, neighbour);
2620 GNUNET_free(message_buf);
2626 * Check if addresses in validated hello "h" overlap with
2627 * those in "chvc->hello" and validate the rest.
2629 * @param cls closure
2630 * @param peer id of the peer, NULL for last call
2631 * @param h hello message for the peer (can be NULL)
2632 * @param trust amount of trust we have in the peer (not used)
2635 check_hello_validated (void *cls,
2636 const struct GNUNET_PeerIdentity *peer,
2637 const struct GNUNET_HELLO_Message *h,
2640 struct CheckHelloValidatedContext *chvc = cls;
2641 struct GNUNET_HELLO_Message *plain_hello;
2642 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2643 struct GNUNET_PeerIdentity target;
2644 struct NeighbourList *n;
2649 GNUNET_CONTAINER_DLL_remove (chvc_head,
2652 if (GNUNET_NO == chvc->hello_known)
2654 /* notify PEERINFO about the peer now, so that we at least
2655 have the public key if some other component needs it */
2656 GNUNET_HELLO_get_key (chvc->hello, &pk);
2657 GNUNET_CRYPTO_hash (&pk,
2658 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2659 &target.hashPubKey);
2660 plain_hello = GNUNET_HELLO_create (&pk,
2663 GNUNET_PEERINFO_add_peer (cfg, sched, &target, plain_hello);
2664 GNUNET_free (plain_hello);
2666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2667 "Peerinfo had no `%s' message for peer `%4s', full validation needed.\n",
2669 GNUNET_i2s (&target));
2671 GNUNET_STATISTICS_update (stats,
2672 gettext_noop ("# new HELLOs requiring full validation"),
2675 GNUNET_HELLO_iterate_addresses (chvc->hello,
2682 GNUNET_STATISTICS_update (stats,
2683 gettext_noop ("# duplicate HELLO (peer known)"),
2693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2694 "Peerinfo had `%s' message for peer `%4s', validating only new addresses.\n",
2698 chvc->hello_known = GNUNET_YES;
2699 n = find_neighbour (peer);
2702 GNUNET_HELLO_iterate_addresses (h,
2704 &add_to_foreign_address_list,
2706 try_transmission_to_peer (n);
2710 GNUNET_STATISTICS_update (stats,
2711 gettext_noop ("# no existing neighbour record (validating HELLO)"),
2715 GNUNET_STATISTICS_update (stats,
2716 gettext_noop ("# HELLO validations (update case)"),
2719 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2721 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
2727 * Process HELLO-message.
2729 * @param plugin transport involved, may be NULL
2730 * @param message the actual message
2731 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2734 process_hello (struct TransportPlugin *plugin,
2735 const struct GNUNET_MessageHeader *message)
2738 struct GNUNET_PeerIdentity target;
2739 const struct GNUNET_HELLO_Message *hello;
2740 struct CheckHelloValidatedContext *chvc;
2741 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2743 hsize = ntohs (message->size);
2744 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2745 (hsize < sizeof (struct GNUNET_MessageHeader)))
2748 return GNUNET_SYSERR;
2750 GNUNET_STATISTICS_update (stats,
2751 gettext_noop ("# HELLOs received for validation"),
2754 /* first, check if load is too high */
2755 if (GNUNET_SCHEDULER_get_load (sched,
2756 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
2758 GNUNET_STATISTICS_update (stats,
2759 gettext_noop ("# HELLOs ignored due to high load"),
2764 hello = (const struct GNUNET_HELLO_Message *) message;
2765 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2767 GNUNET_break_op (0);
2768 return GNUNET_SYSERR;
2770 GNUNET_CRYPTO_hash (&publicKey,
2771 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2772 &target.hashPubKey);
2773 if (0 == memcmp (&my_identity,
2775 sizeof (struct GNUNET_PeerIdentity)))
2777 GNUNET_STATISTICS_update (stats,
2778 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
2783 #if DEBUG_TRANSPORT > 1
2784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2785 "Processing `%s' message for `%4s' of size %u\n",
2787 GNUNET_i2s (&target),
2788 GNUNET_HELLO_size(hello));
2790 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2791 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
2792 memcpy (&chvc[1], hello, hsize);
2793 GNUNET_CONTAINER_DLL_insert (chvc_head,
2796 /* finally, check if HELLO was previously validated
2797 (continuation will then schedule actual validation) */
2798 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2802 HELLO_VERIFICATION_TIMEOUT,
2803 &check_hello_validated, chvc);
2809 * The peer specified by the given neighbour has timed-out or a plugin
2810 * has disconnected. We may either need to do nothing (other plugins
2811 * still up), or trigger a full disconnect and clean up. This
2812 * function updates our state and does the necessary notifications.
2813 * Also notifies our clients that the neighbour is now officially
2816 * @param n the neighbour list entry for the peer
2817 * @param check should we just check if all plugins
2818 * disconnected or must we ask all plugins to
2822 disconnect_neighbour (struct NeighbourList *n, int check)
2824 struct ReadyList *rpos;
2825 struct NeighbourList *npos;
2826 struct NeighbourList *nprev;
2827 struct MessageQueue *mq;
2828 struct ForeignAddressList *peer_addresses;
2829 struct ForeignAddressList *peer_pos;
2831 if (GNUNET_YES == check)
2834 while (NULL != rpos)
2836 peer_addresses = rpos->addresses;
2837 while (peer_addresses != NULL)
2839 if (GNUNET_YES == peer_addresses->connected)
2840 return; /* still connected */
2841 peer_addresses = peer_addresses->next;
2847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2848 "Disconnecting from `%4s'\n",
2849 GNUNET_i2s (&n->id));
2851 /* remove n from neighbours list */
2854 while ((npos != NULL) && (npos != n))
2859 GNUNET_assert (npos != NULL);
2861 neighbours = n->next;
2863 nprev->next = n->next;
2865 /* notify all clients about disconnect */
2866 if (GNUNET_YES == n->received_pong)
2867 notify_clients_disconnect (&n->id);
2869 /* clean up all plugins, cancel connections and pending transmissions */
2870 while (NULL != (rpos = n->plugins))
2872 n->plugins = rpos->next;
2873 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
2874 while (rpos->addresses != NULL)
2876 peer_pos = rpos->addresses;
2877 rpos->addresses = peer_pos->next;
2878 if (peer_pos->connected == GNUNET_YES)
2879 GNUNET_STATISTICS_update (stats,
2880 gettext_noop ("# connected addresses"),
2883 if (GNUNET_YES == peer_pos->validated)
2884 GNUNET_STATISTICS_update (stats,
2885 gettext_noop ("# peer addresses considered valid"),
2888 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
2890 GNUNET_SCHEDULER_cancel (sched,
2891 peer_pos->revalidate_task);
2892 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2894 GNUNET_free(peer_pos);
2899 /* free all messages on the queue */
2900 while (NULL != (mq = n->messages_head))
2902 GNUNET_STATISTICS_update (stats,
2903 gettext_noop ("# bytes in message queue for other peers"),
2904 - (int64_t) mq->message_buf_size,
2906 GNUNET_STATISTICS_update (stats,
2907 gettext_noop ("# bytes discarded due to disconnect"),
2908 mq->message_buf_size,
2910 GNUNET_CONTAINER_DLL_remove (n->messages_head,
2913 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
2915 sizeof(struct GNUNET_PeerIdentity)));
2918 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2920 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2921 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2923 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2925 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
2926 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2928 if (n->piter != NULL)
2930 GNUNET_PEERINFO_iterate_cancel (n->piter);
2933 /* finally, free n itself */
2934 GNUNET_STATISTICS_update (stats,
2935 gettext_noop ("# active neighbours"),
2943 * We have received a PING message from someone. Need to send a PONG message
2944 * in response to the peer by any means necessary.
2946 * FIXME: With something like TCP where a connection exists, we may
2947 * want to send it that way. But the current API does not seem to
2948 * allow us to do so (can't tell this to the transport!)
2951 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2952 const struct GNUNET_PeerIdentity *peer,
2953 const char *sender_address,
2954 size_t sender_address_len)
2956 struct TransportPlugin *plugin = cls;
2957 struct TransportPingMessage *ping;
2958 struct TransportPongMessage *pong;
2959 struct NeighbourList *n;
2960 struct ReadyList *rl;
2961 struct ForeignAddressList *fal;
2963 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
2965 GNUNET_break_op (0);
2966 return GNUNET_SYSERR;
2968 ping = (struct TransportPingMessage *) message;
2969 if (0 != memcmp (&ping->target,
2970 plugin->env.my_identity,
2971 sizeof (struct GNUNET_PeerIdentity)))
2973 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2974 _("Received `%s' message not destined for me!\n"),
2976 return GNUNET_SYSERR;
2979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2980 "Processing `%s' from `%s'\n",
2982 GNUNET_a2s ((const struct sockaddr *)sender_address,
2983 sender_address_len));
2985 GNUNET_STATISTICS_update (stats,
2986 gettext_noop ("# PING messages received"),
2989 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2990 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2991 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2992 pong->purpose.size =
2993 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2995 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2996 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
2997 pong->challenge = ping->challenge;
2998 pong->addrlen = htons(sender_address_len);
2999 memcpy(&pong->signer,
3001 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3002 memcpy (&pong[1], sender_address, sender_address_len);
3003 GNUNET_assert (GNUNET_OK ==
3004 GNUNET_CRYPTO_rsa_sign (my_private_key,
3005 &pong->purpose, &pong->signature));
3007 n = find_neighbour(peer);
3009 n = setup_new_neighbour(peer);
3010 /* broadcast 'PONG' to all available addresses */
3014 fal = rl->addresses;
3017 transmit_to_peer(NULL, fal,
3018 TRANSPORT_PONG_PRIORITY,
3019 HELLO_VERIFICATION_TIMEOUT,
3021 ntohs(pong->header.size),
3034 * Function called by the plugin for each received message.
3035 * Update data volumes, possibly notify plugins about
3036 * reducing the rate at which they read from the socket
3037 * and generally forward to our receive callback.
3039 * @param cls the "struct TransportPlugin *" we gave to the plugin
3040 * @param peer (claimed) identity of the other peer
3041 * @param message the message, NULL if we only care about
3042 * learning about the delay until we should receive again
3043 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
3044 * @param sender_address binary address of the sender (if observed)
3045 * @param sender_address_len number of bytes in sender_address
3046 * @return how long the plugin should wait until receiving more data
3047 * (plugins that do not support this, can ignore the return value)
3049 static struct GNUNET_TIME_Relative
3050 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
3051 const struct GNUNET_MessageHeader *message,
3052 unsigned int distance, const char *sender_address,
3053 size_t sender_address_len)
3055 struct ReadyList *service_context;
3056 struct TransportPlugin *plugin = cls;
3057 struct TransportClient *cpos;
3058 struct InboundMessage *im;
3059 struct ForeignAddressList *peer_address;
3061 struct NeighbourList *n;
3062 struct GNUNET_TIME_Relative ret;
3064 n = find_neighbour (peer);
3066 n = setup_new_neighbour (peer);
3067 service_context = n->plugins;
3068 while ((service_context != NULL) && (plugin != service_context->plugin))
3069 service_context = service_context->next;
3070 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
3071 if (message != NULL)
3073 peer_address = add_peer_address(n,
3076 sender_address_len);
3077 if (peer_address != NULL)
3079 peer_address->distance = distance;
3080 if (peer_address->connected == GNUNET_NO)
3082 /* FIXME: be careful here to not mark
3083 MULTIPLE addresses as connected! */
3084 peer_address->connected = GNUNET_YES;
3085 GNUNET_STATISTICS_update (stats,
3086 gettext_noop ("# connected addresses"),
3090 peer_address->timeout
3092 GNUNET_TIME_relative_to_absolute
3093 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
3094 schedule_next_ping (peer_address);
3096 /* update traffic received amount ... */
3097 msize = ntohs (message->size);
3098 GNUNET_STATISTICS_update (stats,
3099 gettext_noop ("# bytes received from other peers"),
3102 n->distance = distance;
3104 GNUNET_TIME_relative_to_absolute
3105 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
3106 GNUNET_SCHEDULER_cancel (sched,
3109 GNUNET_SCHEDULER_add_delayed (sched,
3110 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3111 &neighbour_timeout_task, n);
3112 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
3114 /* dropping message due to frequent inbound volume violations! */
3115 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
3116 GNUNET_ERROR_TYPE_BULK,
3118 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
3119 n->in_tracker.available_bytes_per_s__,
3120 n->quota_violation_count);
3121 GNUNET_STATISTICS_update (stats,
3122 gettext_noop ("# bandwidth quota violations by other peers"),
3125 return GNUNET_TIME_UNIT_MINUTES; /* minimum penalty, likely ignored (UDP...) */
3127 switch (ntohs (message->type))
3129 case GNUNET_MESSAGE_TYPE_HELLO:
3130 GNUNET_STATISTICS_update (stats,
3131 gettext_noop ("# HELLO messages received from other peers"),
3134 process_hello (plugin, message);
3136 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
3137 handle_ping(plugin, message, peer, sender_address, sender_address_len);
3139 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
3140 handle_pong(plugin, message, peer, sender_address, sender_address_len);
3144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3145 "Received message of type %u from `%4s', sending to all clients.\n",
3146 ntohs (message->type), GNUNET_i2s (peer));
3148 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3150 n->quota_violation_count++;
3152 n->quota_violation_count = 0; /* back within limits */
3153 GNUNET_STATISTICS_update (stats,
3154 gettext_noop ("# payload received from other peers"),
3157 /* transmit message to all clients */
3158 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3159 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3160 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3161 im->latency = GNUNET_TIME_relative_hton (n->latency);
3163 memcpy (&im[1], message, msize);
3165 while (cpos != NULL)
3167 transmit_to_client (cpos, &im->header, GNUNET_YES);
3173 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
3176 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3177 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
3178 (unsigned long long) n->in_tracker.consumption_since_last_update__,
3179 (unsigned int) n->in_tracker.available_bytes_per_s__,
3180 (unsigned long long) ret.value);
3181 GNUNET_STATISTICS_update (stats,
3182 gettext_noop ("# ms throttling suggested"),
3183 (int64_t) ret.value,
3191 * Handle START-message. This is the first message sent to us
3192 * by any client which causes us to add it to our list.
3194 * @param cls closure (always NULL)
3195 * @param client identification of the client
3196 * @param message the actual message
3199 handle_start (void *cls,
3200 struct GNUNET_SERVER_Client *client,
3201 const struct GNUNET_MessageHeader *message)
3203 struct TransportClient *c;
3204 struct ConnectInfoMessage cim;
3205 struct NeighbourList *n;
3208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3209 "Received `%s' request from client\n", "START");
3214 if (c->client == client)
3216 /* client already on our list! */
3218 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3223 c = GNUNET_malloc (sizeof (struct TransportClient));
3227 if (our_hello != NULL)
3230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3231 "Sending our own `%s' to new client\n", "HELLO");
3233 transmit_to_client (c,
3234 (const struct GNUNET_MessageHeader *) our_hello,
3236 /* tell new client about all existing connections */
3237 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
3238 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
3242 if (GNUNET_YES == n->received_pong)
3245 cim.latency = GNUNET_TIME_relative_hton (n->latency);
3246 cim.distance = htonl (n->distance);
3247 transmit_to_client (c, &cim.header, GNUNET_NO);
3252 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3257 * Handle HELLO-message.
3259 * @param cls closure (always NULL)
3260 * @param client identification of the client
3261 * @param message the actual message
3264 handle_hello (void *cls,
3265 struct GNUNET_SERVER_Client *client,
3266 const struct GNUNET_MessageHeader *message)
3270 GNUNET_STATISTICS_update (stats,
3271 gettext_noop ("# HELLOs received from clients"),
3274 ret = process_hello (NULL, message);
3275 GNUNET_SERVER_receive_done (client, ret);
3280 * Handle SEND-message.
3282 * @param cls closure (always NULL)
3283 * @param client identification of the client
3284 * @param message the actual message
3287 handle_send (void *cls,
3288 struct GNUNET_SERVER_Client *client,
3289 const struct GNUNET_MessageHeader *message)
3291 struct TransportClient *tc;
3292 struct NeighbourList *n;
3293 const struct OutboundMessage *obm;
3294 const struct GNUNET_MessageHeader *obmm;
3298 size = ntohs (message->size);
3300 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
3303 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3306 GNUNET_STATISTICS_update (stats,
3307 gettext_noop ("# payload received for other peers"),
3310 obm = (const struct OutboundMessage *) message;
3312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3313 "Received `%s' request from client with target `%4s'\n",
3314 "SEND", GNUNET_i2s (&obm->peer));
3316 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
3317 msize = ntohs (obmm->size);
3318 if (size != msize + sizeof (struct OutboundMessage))
3321 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3324 n = find_neighbour (&obm->peer);
3326 n = setup_new_neighbour (&obm->peer);
3328 while ((tc != NULL) && (tc->client != client))
3332 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3333 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
3335 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
3337 transmit_to_peer (tc, NULL, ntohl (obm->priority),
3338 GNUNET_TIME_relative_ntoh (obm->timeout),
3340 ntohs (obmm->size), GNUNET_NO, n);
3341 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3346 * Handle SET_QUOTA-message.
3348 * @param cls closure (always NULL)
3349 * @param client identification of the client
3350 * @param message the actual message
3353 handle_set_quota (void *cls,
3354 struct GNUNET_SERVER_Client *client,
3355 const struct GNUNET_MessageHeader *message)
3357 const struct QuotaSetMessage *qsm =
3358 (const struct QuotaSetMessage *) message;
3359 struct NeighbourList *n;
3361 GNUNET_STATISTICS_update (stats,
3362 gettext_noop ("# SET QUOTA messages received"),
3365 n = find_neighbour (&qsm->peer);
3368 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3369 GNUNET_STATISTICS_update (stats,
3370 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
3376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3377 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
3379 (unsigned int) ntohl (qsm->quota.value__),
3380 (unsigned int) n->in_tracker.available_bytes_per_s__,
3381 GNUNET_i2s (&qsm->peer));
3383 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
3385 if (0 == ntohl (qsm->quota.value__))
3386 disconnect_neighbour (n, GNUNET_NO);
3387 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3392 * Take the given address and append it to the set of results send back to
3395 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
3396 * @param address the resolved name, NULL to indicate the last response
3399 transmit_address_to_client (void *cls, const char *address)
3401 struct GNUNET_SERVER_TransmitContext *tc = cls;
3404 if (NULL == address)
3407 slen = strlen (address) + 1;
3408 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
3409 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3410 if (NULL == address)
3411 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
3416 * Handle AddressLookup-message.
3418 * @param cls closure (always NULL)
3419 * @param client identification of the client
3420 * @param message the actual message
3423 handle_address_lookup (void *cls,
3424 struct GNUNET_SERVER_Client *client,
3425 const struct GNUNET_MessageHeader *message)
3427 const struct AddressLookupMessage *alum;
3428 struct TransportPlugin *lsPlugin;
3429 const char *nameTransport;
3430 const char *address;
3432 struct GNUNET_SERVER_TransmitContext *tc;
3433 struct GNUNET_TIME_Absolute timeout;
3434 struct GNUNET_TIME_Relative rtimeout;
3437 size = ntohs (message->size);
3438 if (size < sizeof (struct AddressLookupMessage))
3440 GNUNET_break_op (0);
3441 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3444 alum = (const struct AddressLookupMessage *) message;
3445 uint32_t addressLen = ntohl (alum->addrlen);
3446 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
3448 GNUNET_break_op (0);
3449 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3452 address = (const char *) &alum[1];
3453 nameTransport = (const char *) &address[addressLen];
3455 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
3457 GNUNET_break_op (0);
3458 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3461 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
3462 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
3463 numeric = ntohl (alum->numeric_only);
3464 lsPlugin = find_transport (nameTransport);
3465 if (NULL == lsPlugin)
3467 tc = GNUNET_SERVER_transmit_context_create (client);
3468 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
3469 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3470 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
3473 tc = GNUNET_SERVER_transmit_context_create (client);
3474 lsPlugin->api->address_pretty_printer (cls, nameTransport,
3475 address, addressLen,
3478 &transmit_address_to_client, tc);
3482 * List of handlers for the messages understood by this
3485 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3486 {&handle_start, NULL,
3487 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
3488 {&handle_hello, NULL,
3489 GNUNET_MESSAGE_TYPE_HELLO, 0},
3490 {&handle_send, NULL,
3491 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
3492 {&handle_set_quota, NULL,
3493 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
3494 {&handle_address_lookup, NULL,
3495 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
3502 * Setup the environment for this plugin.
3505 create_environment (struct TransportPlugin *plug)
3507 plug->env.cfg = cfg;
3508 plug->env.sched = sched;
3509 plug->env.my_identity = &my_identity;
3510 plug->env.cls = plug;
3511 plug->env.receive = &plugin_env_receive;
3512 plug->env.notify_address = &plugin_env_notify_address;
3513 plug->env.max_connections = max_connect_per_transport;
3514 plug->env.stats = stats;
3519 * Start the specified transport (load the plugin).
3522 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
3524 struct TransportPlugin *plug;
3527 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3528 _("Loading `%s' transport plugin\n"), name);
3529 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
3530 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
3531 create_environment (plug);
3532 plug->short_name = GNUNET_strdup (name);
3533 plug->lib_name = libname;
3534 plug->next = plugins;
3536 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
3537 if (plug->api == NULL)
3539 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3540 _("Failed to load transport plugin for `%s'\n"), name);
3541 GNUNET_free (plug->short_name);
3542 plugins = plug->next;
3543 GNUNET_free (libname);
3550 * Called whenever a client is disconnected. Frees our
3551 * resources associated with that client.
3553 * @param cls closure
3554 * @param client identification of the client
3557 client_disconnect_notification (void *cls,
3558 struct GNUNET_SERVER_Client *client)
3560 struct TransportClient *pos;
3561 struct TransportClient *prev;
3562 struct ClientMessageQueueEntry *mqe;
3567 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3568 "Client disconnected, cleaning up.\n");
3572 while ((pos != NULL) && (pos->client != client))
3579 while (NULL != (mqe = pos->message_queue_head))
3581 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
3582 pos->message_queue_tail,
3584 pos->message_count--;
3588 clients = pos->next;
3590 prev->next = pos->next;
3591 if (GNUNET_YES == pos->tcs_pending)
3596 if (pos->th != NULL)
3598 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
3601 GNUNET_break (0 == pos->message_count);
3607 * Iterator to free entries in the validation_map.
3609 * @param cls closure (unused)
3610 * @param key current key code
3611 * @param value value in the hash map (validation to abort)
3612 * @return GNUNET_YES (always)
3615 abort_validation (void *cls,
3616 const GNUNET_HashCode * key,
3619 struct ValidationEntry *va = value;
3621 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
3622 GNUNET_free (va->transport_name);
3629 * Function called when the service shuts down. Unloads our plugins
3630 * and cancels pending validations.
3632 * @param cls closure, unused
3633 * @param tc task context (unused)
3636 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3638 struct TransportPlugin *plug;
3639 struct OwnAddressList *al;
3640 struct CheckHelloValidatedContext *chvc;
3642 while (neighbours != NULL)
3643 disconnect_neighbour (neighbours, GNUNET_NO);
3645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3646 "Transport service is unloading plugins...\n");
3648 while (NULL != (plug = plugins))
3650 plugins = plug->next;
3651 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3652 GNUNET_free (plug->lib_name);
3653 GNUNET_free (plug->short_name);
3654 while (NULL != (al = plug->addresses))
3656 plug->addresses = al->next;
3661 if (my_private_key != NULL)
3662 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3663 GNUNET_free_non_null (our_hello);
3665 /* free 'chvc' data structure */
3666 while (NULL != (chvc = chvc_head))
3668 chvc_head = chvc->next;
3669 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
3674 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3677 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3678 validation_map = NULL;
3681 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3688 * Initiate transport service.
3690 * @param cls closure
3691 * @param s scheduler to use
3692 * @param serv the initialized server
3693 * @param c configuration to use
3697 struct GNUNET_SCHEDULER_Handle *s,
3698 struct GNUNET_SERVER_Handle *serv,
3699 const struct GNUNET_CONFIGURATION_Handle *c)
3704 unsigned long long tneigh;
3709 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
3710 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
3711 /* parse configuration */
3713 GNUNET_CONFIGURATION_get_value_number (c,
3718 GNUNET_CONFIGURATION_get_value_filename (c,
3720 "HOSTKEY", &keyfile)))
3722 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3724 ("Transport service is lacking key configuration settings. Exiting.\n"));
3725 GNUNET_SCHEDULER_shutdown (s);
3728 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3731 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3732 validation_map = NULL;
3735 max_connect_per_transport = (uint32_t) tneigh;
3736 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3737 GNUNET_free (keyfile);
3738 if (my_private_key == NULL)
3740 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3742 ("Transport service could not access hostkey. Exiting.\n"));
3743 GNUNET_SCHEDULER_shutdown (s);
3746 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3749 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3750 validation_map = NULL;
3753 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3754 GNUNET_CRYPTO_hash (&my_public_key,
3755 sizeof (my_public_key), &my_identity.hashPubKey);
3756 /* setup notification */
3758 GNUNET_SERVER_disconnect_notify (server,
3759 &client_disconnect_notification, NULL);
3760 /* load plugins... */
3763 GNUNET_CONFIGURATION_get_value_string (c,
3764 "TRANSPORT", "PLUGINS", &plugs))
3766 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3767 _("Starting transport plugins `%s'\n"), plugs);
3768 pos = strtok (plugs, " ");
3771 start_transport (server, pos);
3773 pos = strtok (NULL, " ");
3775 GNUNET_free (plugs);
3777 GNUNET_SCHEDULER_add_delayed (sched,
3778 GNUNET_TIME_UNIT_FOREVER_REL,
3779 &shutdown_task, NULL);
3784 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3786 /* process client requests */
3787 GNUNET_SERVER_add_handlers (server, handlers);
3792 * The main function for the transport service.
3794 * @param argc number of arguments from the command line
3795 * @param argv command line arguments
3796 * @return 0 ok, 1 on error
3799 main (int argc, char *const *argv)
3801 return (GNUNET_OK ==
3802 GNUNET_SERVICE_run (argc,
3805 GNUNET_SERVICE_OPTION_NONE,
3806 &run, NULL)) ? 0 : 1;
3809 /* end of gnunet-service-transport.c */