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,
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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
28 * - re-validation is broken (triggered only on successful validation,
29 * does not consider expiration times)
33 * - This code uses 'GNUNET_a2s' for debug printing in many places,
34 * which is technically wrong since it assumes we have IP+Port
35 * (v4/v6) addresses. Once we add transports like http or smtp
36 * this will have to be changed!
39 #include "gnunet_client_lib.h"
40 #include "gnunet_container_lib.h"
41 #include "gnunet_constants.h"
42 #include "gnunet_getopt_lib.h"
43 #include "gnunet_hello_lib.h"
44 #include "gnunet_os_lib.h"
45 #include "gnunet_peerinfo_service.h"
46 #include "gnunet_plugin_lib.h"
47 #include "gnunet_protocols.h"
48 #include "gnunet_service_lib.h"
49 #include "gnunet_signatures.h"
50 #include "plugin_transport.h"
51 #include "transport.h"
54 * Should we do some additional checks (to validate behavior
57 #define EXTRA_CHECKS GNUNET_YES
60 * How many messages can we have pending for a given client process
61 * before we start to drop incoming messages? We typically should
62 * have only one client and so this would be the primary buffer for
63 * messages, so the number should be chosen rather generously.
65 * The expectation here is that most of the time the queue is large
66 * enough so that a drop is virtually never required.
68 #define MAX_PENDING 128
71 * How often should we try to reconnect to a peer using a particular
72 * transport plugin before giving up? Note that the plugin may be
73 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
75 #define MAX_CONNECT_RETRY 3
78 * Limit on the number of ready-to-run tasks when validating
79 * HELLOs. If more tasks are ready to run, we will drop
80 * HELLOs instead of validating them.
82 #define MAX_HELLO_LOAD 4
85 * How often must a peer violate bandwidth quotas before we start
86 * to simply drop its messages?
88 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
91 * How long until a HELLO verification attempt should time out?
92 * Must be rather small, otherwise a partially successful HELLO
93 * validation (some addresses working) might not be available
94 * before a client's request for a connection fails for good.
95 * Besides, if a single request to an address takes a long time,
96 * then the peer is unlikely worthwhile anyway.
98 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
101 * How long will we allow sending of a ping to be delayed?
103 #define TRANSPORT_DEFAULT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
106 * How often will we re-validate for latency information
108 #define TRANSPORT_DEFAULT_REVALIDATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
111 * Priority to use for PONG messages.
113 #define TRANSPORT_PONG_PRIORITY 4
116 * How often do we re-add (cheaper) plugins to our list of plugins
117 * to try for a given connected peer?
119 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
122 * After how long do we expire an address in a HELLO that we just
123 * validated? This value is also used for our own addresses when we
126 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
130 * How long before an existing address expires should we again try to
131 * validate it? Must be (significantly) smaller than
132 * HELLO_ADDRESS_EXPIRATION.
134 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
138 * List of addresses of other peers
140 struct ForeignAddressList
143 * This is a linked list.
145 struct ForeignAddressList *next;
148 * Which ready list does this entry belong to.
150 struct ReadyList *ready_list;
153 * How long until we auto-expire this address (unless it is
154 * re-confirmed by the transport)?
156 struct GNUNET_TIME_Absolute expires;
159 * Task used to re-validate addresses, updates latencies and
162 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
175 * What was the last latency observed for this plugin
176 * and peer? Invalid if connected is GNUNET_NO.
178 struct GNUNET_TIME_Relative latency;
181 * If we did not successfully transmit a message to the given peer
182 * via this connection during the specified time, we should consider
183 * the connection to be dead. This is used in the case that a TCP
184 * transport simply stalls writing to the stream but does not
185 * formerly get a signal that the other peer died.
187 struct GNUNET_TIME_Absolute timeout;
190 * Are we currently connected via this address? The first time we
191 * successfully transmit or receive data to a peer via a particular
192 * address, we set this to GNUNET_YES. If we later get an error
193 * (disconnect notification, transmission failure, timeout), we set
194 * it back to GNUNET_NO.
199 * Is this plugin currently busy transmitting to the specific target?
200 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
201 * messages do not count as 'in transmit'.
206 * Has this address been validated yet?
211 * How often have we tried to connect using this plugin? Used to
212 * discriminate against addresses that do not work well.
213 * FIXME: not yet used, but should be!
215 unsigned int connect_attempts;
218 * DV distance to this peer (1 if no DV is used).
219 * FIXME: need to set this from transport plugins!
227 * Entry in linked list of network addresses for ourselves.
229 struct OwnAddressList
232 * This is a linked list.
234 struct OwnAddressList *next;
237 * The address, actually a pointer to the end
238 * of this struct. Do not free!
243 * How long until we auto-expire this address (unless it is
244 * re-confirmed by the transport)?
246 struct GNUNET_TIME_Absolute expires;
257 * Entry in linked list of all of our plugins.
259 struct TransportPlugin
263 * This is a linked list.
265 struct TransportPlugin *next;
268 * API of the transport as returned by the plugin's
269 * initialization function.
271 struct GNUNET_TRANSPORT_PluginFunctions *api;
274 * Short name for the plugin (i.e. "tcp").
279 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
284 * List of our known addresses for this transport.
286 struct OwnAddressList *addresses;
289 * Environment this transport service is using
292 struct GNUNET_TRANSPORT_PluginEnvironment env;
295 * ID of task that is used to clean up expired addresses.
297 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
300 * Set to GNUNET_YES if we need to scrap the existing
301 * list of "addresses" and start fresh when we receive
302 * the next address update from a transport. Set to
303 * GNUNET_NO if we should just add the new address
304 * to the list and wait for the commit call.
310 struct NeighbourList;
313 * For each neighbour we keep a list of messages
314 * that we still want to transmit to the neighbour.
320 * This is a doubly linked list.
322 struct MessageQueue *next;
325 * This is a doubly linked list.
327 struct MessageQueue *prev;
330 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
331 * stuck together in memory. Allocated at the end of this struct.
333 const char *message_buf;
336 * Size of the message buf
338 size_t message_buf_size;
341 * Client responsible for queueing the message;
342 * used to check that a client has no two messages
343 * pending for the same target. Can be NULL.
345 struct TransportClient *client;
348 * Using which specific address should we send this message?
350 struct ForeignAddressList *specific_address;
353 * Peer ID of the Neighbour this entry belongs to.
355 struct GNUNET_PeerIdentity neighbour_id;
358 * Plugin that we used for the transmission.
359 * NULL until we scheduled a transmission.
361 struct TransportPlugin *plugin;
364 * At what time should we fail?
366 struct GNUNET_TIME_Absolute timeout;
369 * Internal message of the transport system that should not be
370 * included in the usual SEND-SEND_OK transmission confirmation
371 * traffic management scheme. Typically, "internal_msg" will
372 * be set whenever "client" is NULL (but it is not strictly
378 * How important is the message?
380 unsigned int priority;
386 * For a given Neighbour, which plugins are available
387 * to talk to this peer and what are their costs?
392 * This is a linked list.
394 struct ReadyList *next;
397 * Which of our transport plugins does this entry
400 struct TransportPlugin *plugin;
403 * Transport addresses, latency, and readiness for
404 * this particular plugin.
406 struct ForeignAddressList *addresses;
412 * Entry in linked list of all of our current neighbours.
418 * This is a linked list.
420 struct NeighbourList *next;
423 * Which of our transports is connected to this peer
424 * and what is their status?
426 struct ReadyList *plugins;
429 * Head of list of messages we would like to send to this peer;
430 * must contain at most one message per client.
432 struct MessageQueue *messages_head;
435 * Tail of list of messages we would like to send to this peer; must
436 * contain at most one message per client.
438 struct MessageQueue *messages_tail;
441 * Identity of this neighbour.
443 struct GNUNET_PeerIdentity id;
446 * ID of task scheduled to run when this peer is about to
447 * time out (will free resources associated with the peer).
449 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
452 * ID of task scheduled to run when we should retry transmitting
453 * the head of the message queue. Actually triggered when the
454 * transmission is timing out (we trigger instantly when we have
455 * a chance of success).
457 GNUNET_SCHEDULER_TaskIdentifier retry_task;
460 * How long until we should consider this peer dead
461 * (if we don't receive another message in the
464 struct GNUNET_TIME_Absolute peer_timeout;
467 * Tracker for inbound bandwidth.
469 struct GNUNET_BANDWIDTH_Tracker in_tracker;
472 * The latency we have seen for this particular address for
473 * this particular peer. This latency may have been calculated
474 * over multiple transports. This value reflects how long it took
475 * us to receive a response when SENDING via this particular
476 * transport/neighbour/address combination!
478 * FIXME: we need to periodically send PINGs to update this
479 * latency (at least more often than the current "huge" (11h?)
482 struct GNUNET_TIME_Relative latency;
485 * How often has the other peer (recently) violated the
486 * inbound traffic limit? Incremented by 10 per violation,
487 * decremented by 1 per non-violation (for each
490 unsigned int quota_violation_count;
493 * DV distance to this peer (1 if no DV is used).
498 * Have we seen an PONG from this neighbour in the past (and
499 * not had a disconnect since)?
506 * Message used to ask a peer to validate receipt (to check an address
509 struct TransportPingMessage
513 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
515 struct GNUNET_MessageHeader header;
518 * Random challenge number (in network byte order).
520 uint32_t challenge GNUNET_PACKED;
523 * Who is the intended recipient?
525 struct GNUNET_PeerIdentity target;
531 * Message used to validate a HELLO. The challenge is included in the
532 * confirmation to make matching of replies to requests possible. The
533 * signature signs the original challenge number, our public key, the
534 * sender's address (so that the sender can check that the address we
535 * saw is plausible for him and possibly detect a MiM attack) and a
536 * timestamp (to limit replay).<p>
538 * This message is followed by the address of the
539 * client that we are observing (which is part of what
542 struct TransportPongMessage
546 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
548 struct GNUNET_MessageHeader header;
551 * For padding, always zero.
553 uint32_t reserved GNUNET_PACKED;
558 struct GNUNET_CRYPTO_RsaSignature signature;
561 * What are we signing and why?
563 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
566 * Random challenge number (in network byte order).
568 uint32_t challenge GNUNET_PACKED;
571 * Who signed this message?
573 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
576 * Size of address appended to this message
584 * Linked list of messages to be transmitted to the client. Each
585 * entry is followed by the actual message.
587 struct ClientMessageQueueEntry
590 * This is a doubly-linked list.
592 struct ClientMessageQueueEntry *next;
595 * This is a doubly-linked list.
597 struct ClientMessageQueueEntry *prev;
602 * Client connected to the transport service.
604 struct TransportClient
608 * This is a linked list.
610 struct TransportClient *next;
613 * Handle to the client.
615 struct GNUNET_SERVER_Client *client;
618 * Linked list of messages yet to be transmitted to
621 struct ClientMessageQueueEntry *message_queue_head;
624 * Tail of linked list of messages yet to be transmitted to the
627 struct ClientMessageQueueEntry *message_queue_tail;
630 * Current transmit request handle.
632 struct GNUNET_CONNECTION_TransmitHandle *th;
635 * Is a call to "transmit_send_continuation" pending? If so, we
636 * must not free this struct (even if the corresponding client
637 * disconnects) and instead only remove it from the linked list and
638 * set the "client" field to NULL.
643 * Length of the list of messages pending for this client.
645 unsigned int message_count;
651 * Entry in map of all HELLOs awaiting validation.
653 struct ValidationEntry
657 * The address, actually a pointer to the end
658 * of this struct. Do not free!
663 * Name of the transport.
665 char *transport_name;
668 * The public key of the peer.
670 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
673 * ID of task that will clean up this entry if we don't succeed
674 * with the validation first.
676 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
679 * At what time did we send this validation?
681 struct GNUNET_TIME_Absolute send_time;
689 * Challenge number we used.
697 * Context of currently active requests to peerinfo
698 * for validation of HELLOs.
700 struct CheckHelloValidatedContext
704 * This is a doubly-linked list.
706 struct CheckHelloValidatedContext *next;
709 * This is a doubly-linked list.
711 struct CheckHelloValidatedContext *prev;
714 * Hello that we are validating.
716 const struct GNUNET_HELLO_Message *hello;
719 * Context for peerinfo iteration.
720 * NULL after we are done processing peerinfo's information.
722 struct GNUNET_PEERINFO_IteratorContext *piter;
725 * Was a HELLO known for this peer to peerinfo?
732 * Struct for keeping information about addresses to validate
733 * so that we can re-use for sending around ping's and receiving
734 * pongs periodically to keep connections alive and also better
735 * estimate latency of connections.
738 struct PeriodicValidationContext
742 * The address we are keeping alive
744 struct ForeignAddressList *foreign_address;
747 * The name of the transport
752 * Public Key of the peer to re-validate
754 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
761 static struct GNUNET_HELLO_Message *our_hello;
764 * "version" of "our_hello". Used to see if a given neighbour has
765 * already been sent the latest version of our HELLO message.
767 static unsigned int our_hello_version;
772 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
777 static struct GNUNET_PeerIdentity my_identity;
782 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
787 struct GNUNET_SCHEDULER_Handle *sched;
792 const struct GNUNET_CONFIGURATION_Handle *cfg;
795 * Linked list of all clients to this service.
797 static struct TransportClient *clients;
800 * All loaded plugins.
802 static struct TransportPlugin *plugins;
807 static struct GNUNET_SERVER_Handle *server;
810 * All known neighbours and their HELLOs.
812 static struct NeighbourList *neighbours;
815 * Number of neighbours we'd like to have.
817 static uint32_t max_connect_per_transport;
820 * Head of linked list.
822 static struct CheckHelloValidatedContext *chvc_head;
825 * Tail of linked list.
827 static struct CheckHelloValidatedContext *chvc_tail;
830 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
831 * of the given peer that we are currently validating).
833 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
836 * Handle for reporting statistics.
838 static struct GNUNET_STATISTICS_Handle *stats;
842 * The peer specified by the given neighbour has timed-out or a plugin
843 * has disconnected. We may either need to do nothing (other plugins
844 * still up), or trigger a full disconnect and clean up. This
845 * function updates our state and do the necessary notifications.
846 * Also notifies our clients that the neighbour is now officially
849 * @param n the neighbour list entry for the peer
850 * @param check should we just check if all plugins
851 * disconnected or must we ask all plugins to
854 static void disconnect_neighbour (struct NeighbourList *n, int check);
857 * Check the ready list for the given neighbour and if a plugin is
858 * ready for transmission (and if we have a message), do so!
860 * @param neighbour target peer for which to transmit
862 static void try_transmission_to_peer (struct NeighbourList *neighbour);
866 * Find an entry in the neighbour list for a particular peer.
867 * if sender_address is not specified (NULL) then return the
868 * first matching entry. If sender_address is specified, then
869 * make sure that the address and address_len also matches.
871 * FIXME: This description does not fit the function.
873 * @return NULL if not found.
875 static struct NeighbourList *
876 find_neighbour (const struct GNUNET_PeerIdentity *key)
878 struct NeighbourList *head = neighbours;
880 while ((head != NULL) &&
881 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
888 * Find an entry in the transport list for a particular transport.
890 * @return NULL if not found.
892 static struct TransportPlugin *
893 find_transport (const char *short_name)
895 struct TransportPlugin *head = plugins;
896 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
903 * Function called to notify a client about the socket being ready to
904 * queue more data. "buf" will be NULL and "size" zero if the socket
905 * was closed for writing in the meantime.
908 * @param size number of bytes available in buf
909 * @param buf where the callee should write the message
910 * @return number of bytes written to buf
913 transmit_to_client_callback (void *cls, size_t size, void *buf)
915 struct TransportClient *client = cls;
916 struct ClientMessageQueueEntry *q;
919 const struct GNUNET_MessageHeader *msg;
925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
926 "Transmission to client failed, closing connection.\n");
927 /* fatal error with client, free message queue! */
928 while (NULL != (q = client->message_queue_head))
930 GNUNET_STATISTICS_update (stats,
931 gettext_noop ("# bytes discarded (could not transmit to client)"),
932 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
934 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
935 client->message_queue_tail,
939 client->message_count = 0;
944 while (NULL != (q = client->message_queue_head))
946 msg = (const struct GNUNET_MessageHeader *) &q[1];
947 msize = ntohs (msg->size);
948 if (msize + tsize > size)
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 "Transmitting message of type %u to client.\n",
955 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
956 client->message_queue_tail,
958 memcpy (&cbuf[tsize], msg, msize);
961 client->message_count--;
965 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
966 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
968 GNUNET_TIME_UNIT_FOREVER_REL,
969 &transmit_to_client_callback,
971 GNUNET_assert (client->th != NULL);
978 * Send the specified message to the specified client. Since multiple
979 * messages may be pending for the same client at a time, this code
980 * makes sure that no message is lost.
982 * @param client client to transmit the message to
983 * @param msg the message to send
984 * @param may_drop can this message be dropped if the
985 * message queue for this client is getting far too large?
988 transmit_to_client (struct TransportClient *client,
989 const struct GNUNET_MessageHeader *msg, int may_drop)
991 struct ClientMessageQueueEntry *q;
994 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
996 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
998 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
999 client->message_count, MAX_PENDING);
1000 /* TODO: call to statistics... */
1003 msize = ntohs (msg->size);
1004 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1005 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1006 memcpy (&q[1], msg, msize);
1007 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1008 client->message_queue_tail,
1009 client->message_queue_tail,
1011 client->message_count++;
1012 if (client->th == NULL)
1014 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1016 GNUNET_TIME_UNIT_FOREVER_REL,
1017 &transmit_to_client_callback,
1019 GNUNET_assert (client->th != NULL);
1025 * Transmit a 'SEND_OK' notification to the given client for the
1028 * @param client who to notify
1029 * @param n neighbour to notify about
1030 * @param result status code for the transmission request
1033 transmit_send_ok (struct TransportClient *client,
1034 struct NeighbourList *n,
1037 struct SendOkMessage send_ok_msg;
1039 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1040 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1041 send_ok_msg.success = htonl (result);
1042 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1043 send_ok_msg.peer = n->id;
1044 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1049 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1050 * upon "completion" of a send request. This tells the API
1051 * that it is now legal to send another message to the given
1054 * @param cls closure, identifies the entry on the
1055 * message queue that was transmitted and the
1056 * client responsible for queueing the message
1057 * @param target the peer receiving the message
1058 * @param result GNUNET_OK on success, if the transmission
1059 * failed, we should not tell the client to transmit
1063 transmit_send_continuation (void *cls,
1064 const struct GNUNET_PeerIdentity *target,
1067 struct MessageQueue *mq = cls;
1068 struct NeighbourList *n;
1070 GNUNET_STATISTICS_update (stats,
1071 gettext_noop ("# bytes pending with plugins"),
1072 -mq->message_buf_size,
1074 if (result == GNUNET_OK)
1076 GNUNET_STATISTICS_update (stats,
1077 gettext_noop ("# bytes successfully transmitted by plugins"),
1078 mq->message_buf_size,
1083 GNUNET_STATISTICS_update (stats,
1084 gettext_noop ("# bytes with transmission failure by plugins"),
1085 mq->message_buf_size,
1088 n = find_neighbour(&mq->neighbour_id);
1089 GNUNET_assert (n != NULL);
1090 if (mq->specific_address != NULL)
1092 if (result == GNUNET_OK)
1094 mq->specific_address->timeout =
1095 GNUNET_TIME_relative_to_absolute
1096 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1097 if (mq->specific_address->connected != GNUNET_YES)
1099 GNUNET_STATISTICS_update (stats,
1100 gettext_noop ("# connected addresses"),
1103 mq->specific_address->connected = GNUNET_YES;
1108 if (mq->specific_address->connected != GNUNET_NO)
1110 GNUNET_STATISTICS_update (stats,
1111 gettext_noop ("# connected addresses"),
1114 mq->specific_address->connected = GNUNET_NO;
1117 if (! mq->internal_msg)
1118 mq->specific_address->in_transmit = GNUNET_NO;
1120 if (mq->client != NULL)
1121 transmit_send_ok (mq->client, n, result);
1123 try_transmission_to_peer (n);
1128 * Find an address in any of the available transports for
1129 * the given neighbour that would be good for message
1130 * transmission. This is essentially the transport selection
1133 * @param neighbour for whom to select an address
1134 * @return selected address, NULL if we have none
1136 struct ForeignAddressList *
1137 find_ready_address(struct NeighbourList *neighbour)
1139 struct ReadyList *head = neighbour->plugins;
1140 struct ForeignAddressList *addresses;
1141 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1142 struct ForeignAddressList *best_address;
1144 best_address = NULL;
1145 while (head != NULL)
1147 addresses = head->addresses;
1148 while (addresses != NULL)
1150 if ( (addresses->timeout.value < now.value) &&
1151 (addresses->connected == GNUNET_YES) )
1154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1155 "Marking long-time inactive connection to `%4s' as down.\n",
1156 GNUNET_i2s (&neighbour->id));
1158 GNUNET_STATISTICS_update (stats,
1159 gettext_noop ("# connected addresses"),
1162 addresses->connected = GNUNET_NO;
1164 addresses = addresses->next;
1167 addresses = head->addresses;
1168 while (addresses != NULL)
1170 if ( ( (best_address == NULL) ||
1171 (addresses->connected == GNUNET_YES) ||
1172 (best_address->connected == GNUNET_NO) ) &&
1173 (addresses->in_transmit == GNUNET_NO) &&
1174 ( (best_address == NULL) ||
1175 (addresses->latency.value < best_address->latency.value)) )
1176 best_address = addresses;
1177 /* FIXME: also give lower-latency addresses that are not
1178 connected a chance some times... */
1179 addresses = addresses->next;
1183 if (best_address != NULL)
1186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1187 "Best address found has latency of %llu ms.\n",
1188 best_address->latency.value);
1193 GNUNET_STATISTICS_update (stats,
1194 gettext_noop ("# transmission attempts failed (no address)"),
1198 return best_address;
1204 * We should re-try transmitting to the given peer,
1205 * hopefully we've learned something in the meantime.
1208 retry_transmission_task (void *cls,
1209 const struct GNUNET_SCHEDULER_TaskContext *tc)
1211 struct NeighbourList *n = cls;
1213 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1214 try_transmission_to_peer (n);
1219 * Check the ready list for the given neighbour and if a plugin is
1220 * ready for transmission (and if we have a message), do so!
1222 * @param neighbour target peer for which to transmit
1225 try_transmission_to_peer (struct NeighbourList *neighbour)
1227 struct ReadyList *rl;
1228 struct MessageQueue *mq;
1229 struct GNUNET_TIME_Relative timeout;
1231 if (neighbour->messages_head == NULL)
1232 return; /* nothing to do */
1234 mq = neighbour->messages_head;
1235 /* FIXME: support bi-directional use of TCP */
1236 if (mq->specific_address == NULL)
1237 mq->specific_address = find_ready_address(neighbour);
1238 if (mq->specific_address == NULL)
1240 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1241 if (timeout.value == 0)
1244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1245 "No destination address available to transmit message of size %u to peer `%4s'\n",
1246 mq->message_buf_size,
1247 GNUNET_i2s (&mq->neighbour_id));
1249 GNUNET_STATISTICS_update (stats,
1250 gettext_noop ("# bytes in message queue for other peers"),
1251 -mq->message_buf_size,
1253 GNUNET_STATISTICS_update (stats,
1254 gettext_noop ("# bytes discarded (no destination address available)"),
1255 mq->message_buf_size,
1257 if (mq->client != NULL)
1258 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1259 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1260 neighbour->messages_tail,
1263 return; /* nobody ready */
1265 GNUNET_STATISTICS_update (stats,
1266 gettext_noop ("# message delivery deferred (no address)"),
1269 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1270 GNUNET_SCHEDULER_cancel (sched,
1271 neighbour->retry_task);
1272 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1274 &retry_transmission_task,
1277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1278 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1279 mq->message_buf_size,
1280 GNUNET_i2s (&mq->neighbour_id),
1283 /* FIXME: might want to trigger peerinfo lookup here
1284 (unless that's already pending...) */
1287 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1288 neighbour->messages_tail,
1290 if (mq->specific_address->connected == GNUNET_NO)
1291 mq->specific_address->connect_attempts++;
1292 rl = mq->specific_address->ready_list;
1293 mq->plugin = rl->plugin;
1294 if (!mq->internal_msg)
1295 mq->specific_address->in_transmit = GNUNET_YES;
1297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1298 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1299 mq->message_buf_size,
1300 GNUNET_i2s (&neighbour->id),
1301 GNUNET_a2s (mq->specific_address->addr,
1302 mq->specific_address->addrlen),
1303 rl->plugin->short_name);
1305 GNUNET_STATISTICS_update (stats,
1306 gettext_noop ("# bytes in message queue for other peers"),
1307 -mq->message_buf_size,
1309 GNUNET_STATISTICS_update (stats,
1310 gettext_noop ("# bytes pending with plugins"),
1311 mq->message_buf_size,
1313 rl->plugin->api->send (rl->plugin->api->cls,
1316 mq->message_buf_size,
1318 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1319 mq->specific_address->addr,
1320 mq->specific_address->addrlen,
1321 GNUNET_YES /* FIXME: sometimes, we want to be more tolerant here! */,
1322 &transmit_send_continuation, mq);
1327 * Send the specified message to the specified peer.
1329 * @param client source of the transmission request (can be NULL)
1330 * @param peer_address ForeignAddressList where we should send this message
1331 * @param priority how important is the message
1332 * @param timeout how long do we have to transmit?
1333 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1334 * @param message_buf_size total size of all messages in message_buf
1335 * @param is_internal is this an internal message; these are pre-pended and
1336 * also do not count for plugins being "ready" to transmit
1337 * @param neighbour handle to the neighbour for transmission
1340 transmit_to_peer (struct TransportClient *client,
1341 struct ForeignAddressList *peer_address,
1342 unsigned int priority,
1343 struct GNUNET_TIME_Relative timeout,
1344 const char *message_buf,
1345 size_t message_buf_size,
1346 int is_internal, struct NeighbourList *neighbour)
1348 struct MessageQueue *mq;
1353 /* check for duplicate submission */
1354 mq = neighbour->messages_head;
1357 if (mq->client == client)
1359 /* client transmitted to same peer twice
1360 before getting SEND_OK! */
1368 GNUNET_STATISTICS_update (stats,
1369 gettext_noop ("# bytes in message queue for other peers"),
1372 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1373 mq->specific_address = peer_address;
1374 mq->client = client;
1375 memcpy (&mq[1], message_buf, message_buf_size);
1376 mq->message_buf = (const char*) &mq[1];
1377 mq->message_buf_size = message_buf_size;
1378 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1379 mq->internal_msg = is_internal;
1380 mq->priority = priority;
1381 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1383 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1384 neighbour->messages_tail,
1387 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1388 neighbour->messages_tail,
1389 neighbour->messages_tail,
1391 try_transmission_to_peer (neighbour);
1398 struct GeneratorContext
1400 struct TransportPlugin *plug_pos;
1401 struct OwnAddressList *addr_pos;
1402 struct GNUNET_TIME_Absolute expiration;
1410 address_generator (void *cls, size_t max, void *buf)
1412 struct GeneratorContext *gc = cls;
1415 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1417 gc->plug_pos = gc->plug_pos->next;
1418 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1420 if (NULL == gc->plug_pos)
1425 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1428 gc->addr_pos->addrlen, buf, max);
1429 gc->addr_pos = gc->addr_pos->next;
1435 * Construct our HELLO message from all of the addresses of
1436 * all of the transports.
1441 struct GNUNET_HELLO_Message *hello;
1442 struct TransportClient *cpos;
1443 struct NeighbourList *npos;
1444 struct GeneratorContext gc;
1446 gc.plug_pos = plugins;
1447 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1448 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1449 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1452 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1454 GNUNET_STATISTICS_update (stats,
1455 gettext_noop ("# refreshed my HELLO"),
1459 while (cpos != NULL)
1461 transmit_to_client (cpos,
1462 (const struct GNUNET_MessageHeader *) hello,
1467 GNUNET_free_non_null (our_hello);
1469 our_hello_version++;
1470 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1472 while (npos != NULL)
1475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1476 "Transmitting updated `%s' to neighbour `%4s'\n",
1477 "HELLO", GNUNET_i2s (&npos->id));
1479 GNUNET_STATISTICS_update (stats,
1480 gettext_noop ("# transmitted my HELLO to other peers"),
1483 transmit_to_peer (NULL, NULL, 0,
1484 HELLO_ADDRESS_EXPIRATION,
1485 (const char *) our_hello,
1486 GNUNET_HELLO_size(our_hello),
1494 * Task used to clean up expired addresses for a plugin.
1496 * @param cls closure
1500 expire_address_task (void *cls,
1501 const struct GNUNET_SCHEDULER_TaskContext *tc);
1505 * Update the list of addresses for this plugin,
1506 * expiring those that are past their expiration date.
1508 * @param plugin addresses of which plugin should be recomputed?
1509 * @param fresh set to GNUNET_YES if a new address was added
1510 * and we need to regenerate the HELLO even if nobody
1514 update_addresses (struct TransportPlugin *plugin, int fresh)
1516 struct GNUNET_TIME_Relative min_remaining;
1517 struct GNUNET_TIME_Relative remaining;
1518 struct GNUNET_TIME_Absolute now;
1519 struct OwnAddressList *pos;
1520 struct OwnAddressList *prev;
1521 struct OwnAddressList *next;
1524 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1525 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1526 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1527 now = GNUNET_TIME_absolute_get ();
1528 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1529 expired = GNUNET_NO;
1531 pos = plugin->addresses;
1535 if (pos->expires.value < now.value)
1537 expired = GNUNET_YES;
1539 plugin->addresses = pos->next;
1541 prev->next = pos->next;
1546 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1547 if (remaining.value < min_remaining.value)
1548 min_remaining = remaining;
1554 if (expired || fresh)
1556 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1557 plugin->address_update_task
1558 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1560 &expire_address_task, plugin);
1566 * Task used to clean up expired addresses for a plugin.
1568 * @param cls closure
1572 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1574 struct TransportPlugin *plugin = cls;
1575 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1576 update_addresses (plugin, GNUNET_NO);
1581 * Function that must be called by each plugin to notify the
1582 * transport service about the addresses under which the transport
1583 * provided by the plugin can be reached.
1585 * @param cls closure
1586 * @param name name of the transport that generated the address
1587 * @param addr one of the addresses of the host, NULL for the last address
1588 * the specific address format depends on the transport
1589 * @param addrlen length of the address
1590 * @param expires when should this address automatically expire?
1593 plugin_env_notify_address (void *cls,
1597 struct GNUNET_TIME_Relative expires)
1599 struct TransportPlugin *p = cls;
1600 struct OwnAddressList *al;
1601 struct GNUNET_TIME_Absolute abex;
1603 abex = GNUNET_TIME_relative_to_absolute (expires);
1604 GNUNET_assert (p == find_transport (name));
1609 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1611 if (al->expires.value < abex.value)
1618 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
1620 al->next = p->addresses;
1623 al->addrlen = addrlen;
1624 memcpy (&al[1], addr, addrlen);
1625 update_addresses (p, GNUNET_YES);
1630 * Notify all of our clients about a peer connecting.
1633 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1634 struct GNUNET_TIME_Relative latency,
1637 struct ConnectInfoMessage cim;
1638 struct TransportClient *cpos;
1641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1642 "Notifying clients about connection from `%s'\n",
1645 GNUNET_STATISTICS_update (stats,
1646 gettext_noop ("# peers connected"),
1649 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1650 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1651 cim.distance = htonl (distance);
1652 cim.latency = GNUNET_TIME_relative_hton (latency);
1653 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1655 while (cpos != NULL)
1657 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1664 * Notify all of our clients about a peer disconnecting.
1667 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1669 struct DisconnectInfoMessage dim;
1670 struct TransportClient *cpos;
1673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1674 "Notifying clients about lost connection to `%s'\n",
1677 GNUNET_STATISTICS_update (stats,
1678 gettext_noop ("# peers connected"),
1681 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1682 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1683 dim.reserved = htonl (0);
1684 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1686 while (cpos != NULL)
1688 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1695 * Find a ForeignAddressList entry for the given neighbour
1696 * that matches the given address and transport.
1698 * @param neighbour which peer we care about
1699 * @param tname name of the transport plugin
1700 * @param addr binary address
1701 * @param addrlen length of addr
1702 * @return NULL if no such entry exists
1704 static struct ForeignAddressList *
1705 find_peer_address(struct NeighbourList *neighbour,
1710 struct ReadyList *head;
1711 struct ForeignAddressList *address_head;
1713 head = neighbour->plugins;
1714 while (head != NULL)
1716 if (0 == strcmp (tname, head->plugin->short_name))
1723 address_head = head->addresses;
1724 while ( (address_head != NULL) &&
1725 ( (address_head->addrlen != addrlen) ||
1726 (memcmp(address_head->addr, addr, addrlen) != 0) ) )
1727 address_head = address_head->next;
1728 return address_head;
1733 * Get the peer address struct for the given neighbour and
1734 * address. If it doesn't yet exist, create it.
1736 * @param neighbour which peer we care about
1737 * @param tname name of the transport plugin
1738 * @param addr binary address
1739 * @param addrlen length of addr
1740 * @return NULL if we do not have a transport plugin for 'tname'
1742 static struct ForeignAddressList *
1743 add_peer_address(struct NeighbourList *neighbour,
1748 struct ReadyList *head;
1749 struct ForeignAddressList *ret;
1751 ret = find_peer_address (neighbour, tname, addr, addrlen);
1754 head = neighbour->plugins;
1755 while (head != NULL)
1757 if (0 == strcmp (tname, head->plugin->short_name))
1763 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
1764 ret->addr = (const char*) &ret[1];
1765 memcpy (&ret[1], addr, addrlen);
1766 ret->addrlen = addrlen;
1767 ret->expires = GNUNET_TIME_relative_to_absolute
1768 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1769 ret->latency = GNUNET_TIME_relative_get_forever();
1771 ret->timeout = GNUNET_TIME_relative_to_absolute
1772 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1773 ret->ready_list = head;
1774 ret->next = head->addresses;
1775 head->addresses = ret;
1781 * Closure for 'add_validated_address'.
1783 struct AddValidatedAddressContext
1786 * Entry that has been validated.
1788 const struct ValidationEntry *ve;
1791 * Flag set after we have added the address so
1792 * that we terminate the iteration next time.
1799 * Callback function used to fill a buffer of max bytes with a list of
1800 * addresses in the format used by HELLOs. Should use
1801 * "GNUNET_HELLO_add_address" as a helper function.
1803 * @param cls the 'struct AddValidatedAddressContext' with the validated address
1804 * @param max maximum number of bytes that can be written to buf
1805 * @param buf where to write the address information
1806 * @return number of bytes written, 0 to signal the
1807 * end of the iteration.
1810 add_validated_address (void *cls,
1811 size_t max, void *buf)
1813 struct AddValidatedAddressContext *avac = cls;
1814 const struct ValidationEntry *ve = avac->ve;
1816 if (GNUNET_YES == avac->done)
1818 avac->done = GNUNET_YES;
1819 return GNUNET_HELLO_add_address (ve->transport_name,
1820 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
1830 * Closure for 'check_address_exists'.
1832 struct CheckAddressExistsClosure
1835 * Address to check for.
1840 * Name of the transport.
1850 * Set to GNUNET_YES if the address exists.
1857 * Iterator over hash map entries. Checks if the given
1858 * validation entry is for the same address as what is given
1861 * @param cls the 'struct CheckAddressExistsClosure*'
1862 * @param key current key code (ignored)
1863 * @param value value in the hash map ('struct ValidationEntry')
1864 * @return GNUNET_YES if we should continue to
1865 * iterate (mismatch), GNUNET_NO if not (entry matched)
1868 check_address_exists (void *cls,
1869 const GNUNET_HashCode * key,
1872 struct CheckAddressExistsClosure *caec = cls;
1873 struct ValidationEntry *ve = value;
1874 if ( (0 == strcmp (caec->tname,
1875 ve->transport_name)) &&
1876 (caec->addrlen == ve->addrlen) &&
1877 (0 == memcmp (caec->addr,
1881 caec->exists = GNUNET_YES;
1889 * HELLO validation cleanup task (validation failed).
1891 * @param cls the 'struct ValidationEntry' that failed
1892 * @param tc scheduler context (unused)
1895 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1897 struct ValidationEntry *va = cls;
1898 struct GNUNET_PeerIdentity pid;
1900 GNUNET_STATISTICS_update (stats,
1901 gettext_noop ("# address validation timeouts"),
1904 GNUNET_CRYPTO_hash (&va->publicKey,
1906 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1908 GNUNET_CONTAINER_multihashmap_remove (validation_map,
1911 GNUNET_free (va->transport_name);
1917 neighbour_timeout_task (void *cls,
1918 const struct GNUNET_SCHEDULER_TaskContext *tc)
1920 struct NeighbourList *n = cls;
1923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1924 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1926 GNUNET_STATISTICS_update (stats,
1927 gettext_noop ("# disconnects due to timeout"),
1930 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1931 disconnect_neighbour (n, GNUNET_NO);
1936 * Create a fresh entry in our neighbour list for the given peer.
1937 * Will try to transmit our current HELLO to the new neighbour.
1939 * @param peer the peer for which we create the entry
1940 * @return the new neighbour list entry
1942 static struct NeighbourList *
1943 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer)
1945 struct NeighbourList *n;
1946 struct TransportPlugin *tp;
1947 struct ReadyList *rl;
1949 GNUNET_assert (our_hello != NULL);
1950 GNUNET_STATISTICS_update (stats,
1951 gettext_noop ("# active neighbours"),
1954 n = GNUNET_malloc (sizeof (struct NeighbourList));
1955 n->next = neighbours;
1959 GNUNET_TIME_relative_to_absolute
1960 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1961 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1962 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1963 MAX_BANDWIDTH_CARRY_S);
1967 if (tp->api->send != NULL)
1969 rl = GNUNET_malloc (sizeof (struct ReadyList));
1970 rl->next = n->plugins;
1973 rl->addresses = NULL;
1977 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1979 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
1980 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1981 &neighbour_timeout_task, n);
1982 // FIXME: query PEERINFO for HELLO for this peer &
1984 transmit_to_peer (NULL, NULL, 0,
1985 HELLO_ADDRESS_EXPIRATION,
1986 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
1993 * Send periodic PING messages to a give foreign address.
1995 * @param cls our 'struct PeriodicValidationContext*'
1996 * @param tc task context
1999 send_periodic_ping (void *cls,
2000 const struct GNUNET_SCHEDULER_TaskContext *tc)
2002 struct PeriodicValidationContext *pvc = cls;
2003 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey = pvc->publicKey;
2004 char *tname = pvc->transport;
2005 const void *addr = pvc->foreign_address->addr;
2006 size_t addrlen = pvc->foreign_address->addrlen;
2007 struct GNUNET_PeerIdentity id;
2008 struct TransportPlugin *tp;
2009 struct ValidationEntry *va;
2010 struct NeighbourList *neighbour;
2011 struct ForeignAddressList *peer_address;
2012 struct TransportPingMessage ping;
2013 struct CheckAddressExistsClosure caec;
2015 uint16_t hello_size;
2019 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2021 /* We have been shutdown, don't do anything! */
2022 GNUNET_free (tname);
2025 tp = find_transport (tname);
2028 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2029 GNUNET_ERROR_TYPE_BULK,
2031 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2033 GNUNET_free (tname);
2037 GNUNET_CRYPTO_hash (&publicKey,
2039 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2042 caec.addrlen = addrlen;
2044 caec.exists = GNUNET_NO;
2045 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2046 &check_address_exists,
2048 if (caec.exists == GNUNET_YES)
2050 /* During validation attempts we will likely trigger the other
2051 peer trying to validate our address which in turn will cause
2052 it to send us its HELLO, so we expect to hit this case rather
2053 frequently. Only print something if we are very verbose. */
2054 #if DEBUG_TRANSPORT > 1
2055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2056 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2057 GNUNET_a2s (addr, addrlen),
2061 GNUNET_free (tname);
2064 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2065 va->transport_name = tname;
2066 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2068 va->send_time = GNUNET_TIME_absolute_get();
2069 va->addr = (const void*) &va[1];
2070 memcpy (&va[1], addr, addrlen);
2071 va->addrlen = addrlen;
2072 memcpy(&va->publicKey, &publicKey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2073 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2074 HELLO_VERIFICATION_TIMEOUT,
2075 &timeout_hello_validation,
2077 GNUNET_CONTAINER_multihashmap_put (validation_map,
2080 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2081 neighbour = find_neighbour(&id);
2082 /* FIXME: can neighbour be NULL here? (why do we still PING?)? If so,
2083 should we even do this? */
2084 if (neighbour == NULL)
2085 neighbour = setup_new_neighbour(&id);
2086 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2087 GNUNET_assert(peer_address != NULL);
2088 hello_size = GNUNET_HELLO_size(our_hello);
2089 tsize = sizeof(struct TransportPingMessage) + hello_size;
2090 message_buf = GNUNET_malloc(tsize);
2091 ping.challenge = htonl(va->challenge);
2092 ping.header.size = htons(sizeof(struct TransportPingMessage));
2093 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2094 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2095 memcpy(message_buf, our_hello, hello_size);
2096 memcpy(&message_buf[hello_size],
2098 sizeof(struct TransportPingMessage));
2099 #if DEBUG_TRANSPORT_REVALIDATION
2100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2101 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2102 GNUNET_a2s (addr, addrlen),
2105 "HELLO", hello_size,
2106 "PING", sizeof (struct TransportPingMessage));
2108 GNUNET_STATISTICS_update (stats,
2109 gettext_noop ("# PING messages sent for re-validation"),
2112 transmit_to_peer (NULL, peer_address,
2113 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2114 HELLO_VERIFICATION_TIMEOUT,
2116 GNUNET_YES, neighbour);
2117 GNUNET_free(message_buf);
2122 * Iterator over hash map entries. Checks if the given validation
2123 * entry is for the same challenge as what is given in the PONG.
2125 * @param cls the 'struct TransportPongMessage*'
2126 * @param key peer identity
2127 * @param value value in the hash map ('struct ValidationEntry')
2128 * @return GNUNET_YES if we should continue to
2129 * iterate (mismatch), GNUNET_NO if not (entry matched)
2132 check_pending_validation (void *cls,
2133 const GNUNET_HashCode * key,
2136 const struct TransportPongMessage *pong = cls;
2137 struct ValidationEntry *ve = value;
2138 struct AddValidatedAddressContext avac;
2139 unsigned int challenge = ntohl(pong->challenge);
2140 struct GNUNET_HELLO_Message *hello;
2141 struct GNUNET_PeerIdentity target;
2142 struct NeighbourList *n;
2143 struct ForeignAddressList *fal;
2144 struct PeriodicValidationContext *periodic_validation_context;
2146 if (ve->challenge != challenge)
2150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2151 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
2153 GNUNET_a2s ((const struct sockaddr *) ve->addr,
2155 ve->transport_name);
2157 GNUNET_STATISTICS_update (stats,
2158 gettext_noop ("# address validation successes"),
2161 /* create the updated HELLO */
2162 GNUNET_CRYPTO_hash (&ve->publicKey,
2163 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2164 &target.hashPubKey);
2165 avac.done = GNUNET_NO;
2167 hello = GNUNET_HELLO_create (&ve->publicKey,
2168 &add_validated_address,
2170 GNUNET_PEERINFO_add_peer (cfg, sched,
2173 GNUNET_free (hello);
2174 n = find_neighbour (&target);
2177 fal = add_peer_address (n,
2181 GNUNET_assert (fal != NULL);
2182 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
2183 fal->validated = GNUNET_YES;
2184 GNUNET_STATISTICS_update (stats,
2185 gettext_noop ("# peer addresses considered valid"),
2188 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
2189 periodic_validation_context = GNUNET_malloc(sizeof(struct PeriodicValidationContext));
2190 periodic_validation_context->foreign_address = fal;
2191 periodic_validation_context->transport = strdup(ve->transport_name);
2192 memcpy(&periodic_validation_context->publicKey,
2194 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2195 /* FIXME: this causes all of the revalidation PINGs for the same HELLO
2196 to be transmitted in bulk, which is not nice; also,
2197 triggering these HERE means that revalidations do NOT happen AT ALL
2198 for HELLOs a previous instance of this process validated (since
2199 there is no "initial" validation PING => no revalidation => BUG! */
2200 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
2201 TRANSPORT_DEFAULT_REVALIDATION,
2202 &send_periodic_ping,
2203 periodic_validation_context);
2204 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
2205 n->latency = fal->latency;
2207 n->latency.value = (fal->latency.value + n->latency.value) / 2;
2208 n->distance = fal->distance;
2209 if (GNUNET_NO == n->received_pong)
2211 notify_clients_connect (&target, n->latency, n->distance);
2212 n->received_pong = GNUNET_YES;
2214 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2216 GNUNET_SCHEDULER_cancel (sched,
2218 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2219 try_transmission_to_peer (n);
2223 /* clean up validation entry */
2224 GNUNET_assert (GNUNET_YES ==
2225 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2228 GNUNET_SCHEDULER_cancel (sched,
2230 GNUNET_free (ve->transport_name);
2237 * Function that will be called if we receive a validation
2238 * of an address challenge that we transmitted to another
2239 * peer. Note that the validation should only be considered
2240 * acceptable if the challenge matches AND if the sender
2241 * address is at least a plausible address for this peer
2242 * (otherwise we may be seeing a MiM attack).
2244 * @param cls closure
2245 * @param message the pong message
2246 * @param peer who responded to our challenge
2247 * @param sender_address string describing our sender address (as observed
2248 * by the other peer in binary format)
2249 * @param sender_address_len number of bytes in 'sender_address'
2252 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
2253 const struct GNUNET_PeerIdentity *peer,
2254 const char *sender_address,
2255 size_t sender_address_len)
2257 #if DEBUG_TRANSPORT > 1
2258 /* we get tons of these that just get discarded, only log
2259 if we are quite verbose */
2260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2261 "Receiving `%s' message from `%4s'.\n", "PONG",
2264 GNUNET_STATISTICS_update (stats,
2265 gettext_noop ("# PONG messages received"),
2268 if (GNUNET_SYSERR !=
2269 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
2271 &check_pending_validation,
2274 /* This is *expected* to happen a lot since we send
2275 PONGs to *all* known addresses of the sender of
2276 the PING, so most likely we get multiple PONGs
2277 per PING, and all but the first PONG will end up
2278 here. So really we should not print anything here
2279 unless we want to be very, very verbose... */
2280 #if DEBUG_TRANSPORT > 2
2281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2282 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
2291 /* FIXME: add given address to potential pool of our addresses
2293 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
2294 _("Another peer saw us using the address `%s' via `%s'.\n"),
2295 GNUNET_a2s ((const struct sockaddr *) &pong[1],
2296 ntohs(pong->addrlen)),
2297 va->transport_name);
2303 * Check if the given address is already being validated; if not,
2304 * append the given address to the list of entries that are being be
2305 * validated and initiate validation.
2307 * @param cls closure ('struct CheckHelloValidatedContext *')
2308 * @param tname name of the transport
2309 * @param expiration expiration time
2310 * @param addr the address
2311 * @param addrlen length of the address
2312 * @return GNUNET_OK (always)
2315 run_validation (void *cls,
2317 struct GNUNET_TIME_Absolute expiration,
2318 const void *addr, size_t addrlen)
2320 struct CheckHelloValidatedContext *chvc = cls;
2321 struct GNUNET_PeerIdentity id;
2322 struct TransportPlugin *tp;
2323 struct ValidationEntry *va;
2324 struct NeighbourList *neighbour;
2325 struct ForeignAddressList *peer_address;
2326 struct TransportPingMessage ping;
2327 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2328 struct CheckAddressExistsClosure caec;
2330 uint16_t hello_size;
2333 GNUNET_STATISTICS_update (stats,
2334 gettext_noop ("# peer addresses scheduled for validation"),
2337 tp = find_transport (tname);
2340 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2341 GNUNET_ERROR_TYPE_BULK,
2343 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2345 GNUNET_STATISTICS_update (stats,
2346 gettext_noop ("# peer addresses not validated (no applicable transport plugin available)"),
2351 GNUNET_HELLO_get_key (chvc->hello, &pk);
2352 GNUNET_CRYPTO_hash (&pk,
2354 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2357 caec.addrlen = addrlen;
2359 caec.exists = GNUNET_NO;
2360 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2361 &check_address_exists,
2363 if (caec.exists == GNUNET_YES)
2365 /* During validation attempts we will likely trigger the other
2366 peer trying to validate our address which in turn will cause
2367 it to send us its HELLO, so we expect to hit this case rather
2368 frequently. Only print something if we are very verbose. */
2369 #if DEBUG_TRANSPORT > 1
2370 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2371 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2372 GNUNET_a2s (addr, addrlen),
2376 GNUNET_STATISTICS_update (stats,
2377 gettext_noop ("# peer addresses not validated (in progress)"),
2382 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2383 va->transport_name = GNUNET_strdup (tname);
2384 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2386 va->send_time = GNUNET_TIME_absolute_get();
2387 va->addr = (const void*) &va[1];
2388 memcpy (&va[1], addr, addrlen);
2389 va->addrlen = addrlen;
2390 GNUNET_HELLO_get_key (chvc->hello,
2392 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2393 HELLO_VERIFICATION_TIMEOUT,
2394 &timeout_hello_validation,
2396 GNUNET_CONTAINER_multihashmap_put (validation_map,
2399 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2400 neighbour = find_neighbour(&id);
2401 if (neighbour == NULL)
2402 neighbour = setup_new_neighbour(&id);
2403 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2404 GNUNET_assert(peer_address != NULL);
2405 hello_size = GNUNET_HELLO_size(our_hello);
2406 tsize = sizeof(struct TransportPingMessage) + hello_size;
2407 message_buf = GNUNET_malloc(tsize);
2408 ping.challenge = htonl(va->challenge);
2409 ping.header.size = htons(sizeof(struct TransportPingMessage));
2410 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2411 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2412 memcpy(message_buf, our_hello, hello_size);
2413 memcpy(&message_buf[hello_size],
2415 sizeof(struct TransportPingMessage));
2417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2418 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2419 GNUNET_a2s (addr, addrlen),
2422 "HELLO", hello_size,
2423 "PING", sizeof (struct TransportPingMessage));
2425 GNUNET_STATISTICS_update (stats,
2426 gettext_noop ("# PING messages sent for initial validation"),
2429 transmit_to_peer (NULL, peer_address,
2430 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2431 HELLO_VERIFICATION_TIMEOUT,
2433 GNUNET_YES, neighbour);
2434 GNUNET_free(message_buf);
2440 * Add the given address to the list of foreign addresses
2441 * available for the given peer (check for duplicates).
2443 * @param cls the respective 'struct NeighbourList' to update
2444 * @param tname name of the transport
2445 * @param expiration expiration time
2446 * @param addr the address
2447 * @param addrlen length of the address
2448 * @return GNUNET_OK (always)
2451 add_to_foreign_address_list (void *cls,
2453 struct GNUNET_TIME_Absolute expiration,
2454 const void *addr, size_t addrlen)
2456 struct NeighbourList *n = cls;
2457 struct ForeignAddressList *fal;
2460 GNUNET_STATISTICS_update (stats,
2461 gettext_noop ("# valid peer addresses returned by peerinfo"),
2465 fal = find_peer_address (n, tname, addr, addrlen);
2469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2470 "Adding address `%s' (%s) for peer `%4s' due to peerinfo data for %llums.\n",
2471 GNUNET_a2s (addr, addrlen),
2473 GNUNET_i2s (&n->id),
2476 fal = add_peer_address (n, tname, addr, addrlen);
2479 GNUNET_STATISTICS_update (stats,
2480 gettext_noop ("# previously validated addresses lacking transport"),
2488 fal->expires = GNUNET_TIME_absolute_max (expiration,
2490 if (fal->validated == GNUNET_NO)
2492 fal->validated = GNUNET_YES;
2493 GNUNET_STATISTICS_update (stats,
2494 gettext_noop ("# peer addresses considered valid"),
2498 if (try == GNUNET_YES)
2499 try_transmission_to_peer (n);
2505 * Check if addresses in validated hello "h" overlap with
2506 * those in "chvc->hello" and validate the rest.
2508 * @param cls closure
2509 * @param peer id of the peer, NULL for last call
2510 * @param h hello message for the peer (can be NULL)
2511 * @param trust amount of trust we have in the peer (not used)
2514 check_hello_validated (void *cls,
2515 const struct GNUNET_PeerIdentity *peer,
2516 const struct GNUNET_HELLO_Message *h,
2519 struct CheckHelloValidatedContext *chvc = cls;
2520 struct GNUNET_HELLO_Message *plain_hello;
2521 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2522 struct GNUNET_PeerIdentity target;
2523 struct NeighbourList *n;
2528 GNUNET_CONTAINER_DLL_remove (chvc_head,
2531 if (GNUNET_NO == chvc->hello_known)
2533 /* notify PEERINFO about the peer now, so that we at least
2534 have the public key if some other component needs it */
2535 GNUNET_HELLO_get_key (chvc->hello, &pk);
2536 GNUNET_CRYPTO_hash (&pk,
2537 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2538 &target.hashPubKey);
2539 plain_hello = GNUNET_HELLO_create (&pk,
2542 GNUNET_PEERINFO_add_peer (cfg, sched, &target, plain_hello);
2543 GNUNET_free (plain_hello);
2545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2546 "Peerinfo had no `%s' message for peer `%4s', full validation needed.\n",
2548 GNUNET_i2s (&target));
2550 GNUNET_STATISTICS_update (stats,
2551 gettext_noop ("# new HELLOs requiring full validation"),
2554 GNUNET_HELLO_iterate_addresses (chvc->hello,
2561 GNUNET_STATISTICS_update (stats,
2562 gettext_noop ("# duplicate HELLO (peer known)"),
2572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2573 "Peerinfo had `%s' message for peer `%4s', validating only new addresses.\n",
2577 chvc->hello_known = GNUNET_YES;
2578 n = find_neighbour (peer);
2581 GNUNET_HELLO_iterate_addresses (h,
2583 &add_to_foreign_address_list,
2585 try_transmission_to_peer (n);
2589 GNUNET_STATISTICS_update (stats,
2590 gettext_noop ("# no existing neighbour record (validating HELLO)"),
2594 GNUNET_STATISTICS_update (stats,
2595 gettext_noop ("# HELLO validations (update case)"),
2598 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2600 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
2606 * Process HELLO-message.
2608 * @param plugin transport involved, may be NULL
2609 * @param message the actual message
2610 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2613 process_hello (struct TransportPlugin *plugin,
2614 const struct GNUNET_MessageHeader *message)
2617 struct GNUNET_PeerIdentity target;
2618 const struct GNUNET_HELLO_Message *hello;
2619 struct CheckHelloValidatedContext *chvc;
2620 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2622 hsize = ntohs (message->size);
2623 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2624 (hsize < sizeof (struct GNUNET_MessageHeader)))
2627 return GNUNET_SYSERR;
2629 GNUNET_STATISTICS_update (stats,
2630 gettext_noop ("# HELLOs received for validation"),
2633 /* first, check if load is too high */
2634 if (GNUNET_SCHEDULER_get_load (sched,
2635 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
2637 GNUNET_STATISTICS_update (stats,
2638 gettext_noop ("# HELLOs ignored due to high load"),
2643 hello = (const struct GNUNET_HELLO_Message *) message;
2644 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2646 GNUNET_break_op (0);
2647 return GNUNET_SYSERR;
2649 GNUNET_CRYPTO_hash (&publicKey,
2650 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2651 &target.hashPubKey);
2652 if (0 == memcmp (&my_identity,
2654 sizeof (struct GNUNET_PeerIdentity)))
2656 GNUNET_STATISTICS_update (stats,
2657 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
2662 #if DEBUG_TRANSPORT > 1
2663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2664 "Processing `%s' message for `%4s' of size %u\n",
2666 GNUNET_i2s (&target),
2667 GNUNET_HELLO_size(hello));
2669 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2670 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
2671 memcpy (&chvc[1], hello, hsize);
2672 GNUNET_CONTAINER_DLL_insert (chvc_head,
2675 /* finally, check if HELLO was previously validated
2676 (continuation will then schedule actual validation) */
2677 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2681 HELLO_VERIFICATION_TIMEOUT,
2682 &check_hello_validated, chvc);
2688 * The peer specified by the given neighbour has timed-out or a plugin
2689 * has disconnected. We may either need to do nothing (other plugins
2690 * still up), or trigger a full disconnect and clean up. This
2691 * function updates our state and does the necessary notifications.
2692 * Also notifies our clients that the neighbour is now officially
2695 * @param n the neighbour list entry for the peer
2696 * @param check should we just check if all plugins
2697 * disconnected or must we ask all plugins to
2701 disconnect_neighbour (struct NeighbourList *n, int check)
2703 struct ReadyList *rpos;
2704 struct NeighbourList *npos;
2705 struct NeighbourList *nprev;
2706 struct MessageQueue *mq;
2707 struct ForeignAddressList *peer_addresses;
2708 struct ForeignAddressList *peer_pos;
2710 if (GNUNET_YES == check)
2713 while (NULL != rpos)
2715 peer_addresses = rpos->addresses;
2716 while (peer_addresses != NULL)
2718 if (GNUNET_YES == peer_addresses->connected)
2719 return; /* still connected */
2720 peer_addresses = peer_addresses->next;
2726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2727 "Disconnecting from `%4s'\n",
2728 GNUNET_i2s (&n->id));
2730 /* remove n from neighbours list */
2733 while ((npos != NULL) && (npos != n))
2738 GNUNET_assert (npos != NULL);
2740 neighbours = n->next;
2742 nprev->next = n->next;
2744 /* notify all clients about disconnect */
2745 if (GNUNET_YES == n->received_pong)
2746 notify_clients_disconnect (&n->id);
2748 /* clean up all plugins, cancel connections and pending transmissions */
2749 while (NULL != (rpos = n->plugins))
2751 n->plugins = rpos->next;
2752 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
2753 while (rpos->addresses != NULL)
2755 peer_pos = rpos->addresses;
2756 rpos->addresses = peer_pos->next;
2757 if (peer_pos->connected == GNUNET_YES)
2758 GNUNET_STATISTICS_update (stats,
2759 gettext_noop ("# connected addresses"),
2762 if (GNUNET_YES == peer_pos->validated)
2763 GNUNET_STATISTICS_update (stats,
2764 gettext_noop ("# peer addresses considered valid"),
2767 GNUNET_free(peer_pos);
2772 /* free all messages on the queue */
2773 while (NULL != (mq = n->messages_head))
2775 GNUNET_STATISTICS_update (stats,
2776 gettext_noop ("# bytes in message queue for other peers"),
2777 -mq->message_buf_size,
2779 GNUNET_STATISTICS_update (stats,
2780 gettext_noop ("# bytes discarded due to disconnect"),
2781 mq->message_buf_size,
2783 GNUNET_CONTAINER_DLL_remove (n->messages_head,
2786 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
2788 sizeof(struct GNUNET_PeerIdentity)));
2791 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2793 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2794 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2796 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2798 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
2799 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2801 /* finally, free n itself */
2802 GNUNET_STATISTICS_update (stats,
2803 gettext_noop ("# active neighbours"),
2811 * We have received a PING message from someone. Need to send a PONG message
2812 * in response to the peer by any means necessary.
2814 * FIXME: With something like TCP where a connection exists, we may
2815 * want to send it that way. But the current API does not seem to
2816 * allow us to do so (can't tell this to the transport!)
2819 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2820 const struct GNUNET_PeerIdentity *peer,
2821 const char *sender_address,
2822 size_t sender_address_len)
2824 struct TransportPlugin *plugin = cls;
2825 struct TransportPingMessage *ping;
2826 struct TransportPongMessage *pong;
2827 struct NeighbourList *n;
2828 struct ReadyList *rl;
2829 struct ForeignAddressList *fal;
2831 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
2833 GNUNET_break_op (0);
2834 return GNUNET_SYSERR;
2836 ping = (struct TransportPingMessage *) message;
2837 if (0 != memcmp (&ping->target,
2838 plugin->env.my_identity,
2839 sizeof (struct GNUNET_PeerIdentity)))
2841 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2842 _("Received `%s' message not destined for me!\n"),
2844 return GNUNET_SYSERR;
2847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2848 "Processing `%s' from `%s'\n",
2850 GNUNET_a2s ((const struct sockaddr *)sender_address,
2851 sender_address_len));
2853 GNUNET_STATISTICS_update (stats,
2854 gettext_noop ("# PING messages received"),
2857 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2858 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2859 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2860 pong->purpose.size =
2861 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2863 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2864 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
2865 pong->challenge = ping->challenge;
2866 pong->addrlen = htons(sender_address_len);
2867 memcpy(&pong->signer,
2869 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2870 memcpy (&pong[1], sender_address, sender_address_len);
2871 GNUNET_assert (GNUNET_OK ==
2872 GNUNET_CRYPTO_rsa_sign (my_private_key,
2873 &pong->purpose, &pong->signature));
2875 n = find_neighbour(peer);
2877 n = setup_new_neighbour(peer);
2878 /* broadcast 'PONG' to all available addresses */
2882 fal = rl->addresses;
2885 transmit_to_peer(NULL, fal,
2886 TRANSPORT_PONG_PRIORITY,
2887 HELLO_VERIFICATION_TIMEOUT,
2889 ntohs(pong->header.size),
2902 * Function called by the plugin for each received message.
2903 * Update data volumes, possibly notify plugins about
2904 * reducing the rate at which they read from the socket
2905 * and generally forward to our receive callback.
2907 * @param cls the "struct TransportPlugin *" we gave to the plugin
2908 * @param peer (claimed) identity of the other peer
2909 * @param message the message, NULL if we only care about
2910 * learning about the delay until we should receive again
2911 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
2912 * @param sender_address binary address of the sender (if observed)
2913 * @param sender_address_len number of bytes in sender_address
2914 * @return how long the plugin should wait until receiving more data
2915 * (plugins that do not support this, can ignore the return value)
2917 static struct GNUNET_TIME_Relative
2918 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
2919 const struct GNUNET_MessageHeader *message,
2920 unsigned int distance, const char *sender_address,
2921 size_t sender_address_len)
2923 struct ReadyList *service_context;
2924 struct TransportPlugin *plugin = cls;
2925 struct TransportClient *cpos;
2926 struct InboundMessage *im;
2927 struct ForeignAddressList *peer_address;
2929 struct NeighbourList *n;
2930 struct GNUNET_TIME_Relative ret;
2932 n = find_neighbour (peer);
2934 n = setup_new_neighbour (peer);
2935 service_context = n->plugins;
2936 while ((service_context != NULL) && (plugin != service_context->plugin))
2937 service_context = service_context->next;
2938 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
2939 if (message != NULL)
2941 peer_address = add_peer_address(n,
2944 sender_address_len);
2945 if (peer_address != NULL)
2947 peer_address->distance = distance;
2948 if (peer_address->connected == GNUNET_NO)
2950 peer_address->connected = GNUNET_YES;
2951 peer_address->connect_attempts++;
2952 GNUNET_STATISTICS_update (stats,
2953 gettext_noop ("# connected addresses"),
2957 peer_address->timeout
2959 GNUNET_TIME_relative_to_absolute
2960 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2962 /* update traffic received amount ... */
2963 msize = ntohs (message->size);
2964 GNUNET_STATISTICS_update (stats,
2965 gettext_noop ("# bytes received from other peers"),
2968 n->distance = distance;
2970 GNUNET_TIME_relative_to_absolute
2971 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2972 GNUNET_SCHEDULER_cancel (sched,
2975 GNUNET_SCHEDULER_add_delayed (sched,
2976 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2977 &neighbour_timeout_task, n);
2978 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
2980 /* dropping message due to frequent inbound volume violations! */
2981 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
2982 GNUNET_ERROR_TYPE_BULK,
2984 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
2985 n->in_tracker.available_bytes_per_s__,
2986 n->quota_violation_count);
2987 GNUNET_STATISTICS_update (stats,
2988 gettext_noop ("# bandwidth quota violations by other peers"),
2991 return GNUNET_TIME_UNIT_MINUTES; /* minimum penalty, likely ignored (UDP...) */
2993 switch (ntohs (message->type))
2995 case GNUNET_MESSAGE_TYPE_HELLO:
2996 GNUNET_STATISTICS_update (stats,
2997 gettext_noop ("# HELLO messages received from other peers"),
3000 process_hello (plugin, message);
3002 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
3003 handle_ping(plugin, message, peer, sender_address, sender_address_len);
3005 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
3006 handle_pong(plugin, message, peer, sender_address, sender_address_len);
3010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3011 "Received message of type %u from `%4s', sending to all clients.\n",
3012 ntohs (message->type), GNUNET_i2s (peer));
3014 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3016 n->quota_violation_count++;
3018 n->quota_violation_count = 0; /* back within limits */
3019 GNUNET_STATISTICS_update (stats,
3020 gettext_noop ("# payload received from other peers"),
3023 /* transmit message to all clients */
3024 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3025 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3026 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3027 im->latency = GNUNET_TIME_relative_hton (n->latency);
3029 memcpy (&im[1], message, msize);
3031 while (cpos != NULL)
3033 transmit_to_client (cpos, &im->header, GNUNET_YES);
3039 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
3042 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3043 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
3044 (unsigned long long) n->in_tracker.consumption_since_last_update__,
3045 (unsigned int) n->in_tracker.available_bytes_per_s__,
3046 (unsigned long long) ret.value);
3047 GNUNET_STATISTICS_update (stats,
3048 gettext_noop ("# ms throttling suggested"),
3049 (int64_t) ret.value,
3057 * Handle START-message. This is the first message sent to us
3058 * by any client which causes us to add it to our list.
3060 * @param cls closure (always NULL)
3061 * @param client identification of the client
3062 * @param message the actual message
3065 handle_start (void *cls,
3066 struct GNUNET_SERVER_Client *client,
3067 const struct GNUNET_MessageHeader *message)
3069 struct TransportClient *c;
3070 struct ConnectInfoMessage cim;
3071 struct NeighbourList *n;
3074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3075 "Received `%s' request from client\n", "START");
3080 if (c->client == client)
3082 /* client already on our list! */
3084 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3089 c = GNUNET_malloc (sizeof (struct TransportClient));
3093 if (our_hello != NULL)
3096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3097 "Sending our own `%s' to new client\n", "HELLO");
3099 transmit_to_client (c,
3100 (const struct GNUNET_MessageHeader *) our_hello,
3102 /* tell new client about all existing connections */
3103 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
3104 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
3108 if (GNUNET_YES == n->received_pong)
3111 cim.latency = GNUNET_TIME_relative_hton (n->latency);
3112 cim.distance = htonl (n->distance);
3113 transmit_to_client (c, &cim.header, GNUNET_NO);
3118 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3123 * Handle HELLO-message.
3125 * @param cls closure (always NULL)
3126 * @param client identification of the client
3127 * @param message the actual message
3130 handle_hello (void *cls,
3131 struct GNUNET_SERVER_Client *client,
3132 const struct GNUNET_MessageHeader *message)
3136 GNUNET_STATISTICS_update (stats,
3137 gettext_noop ("# HELLOs received from clients"),
3140 ret = process_hello (NULL, message);
3141 GNUNET_SERVER_receive_done (client, ret);
3146 * Handle SEND-message.
3148 * @param cls closure (always NULL)
3149 * @param client identification of the client
3150 * @param message the actual message
3153 handle_send (void *cls,
3154 struct GNUNET_SERVER_Client *client,
3155 const struct GNUNET_MessageHeader *message)
3157 struct TransportClient *tc;
3158 struct NeighbourList *n;
3159 const struct OutboundMessage *obm;
3160 const struct GNUNET_MessageHeader *obmm;
3164 size = ntohs (message->size);
3166 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
3169 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3172 GNUNET_STATISTICS_update (stats,
3173 gettext_noop ("# payload received for other peers"),
3176 obm = (const struct OutboundMessage *) message;
3178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3179 "Received `%s' request from client with target `%4s'\n",
3180 "SEND", GNUNET_i2s (&obm->peer));
3182 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
3183 msize = ntohs (obmm->size);
3184 if (size != msize + sizeof (struct OutboundMessage))
3187 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3190 n = find_neighbour (&obm->peer);
3192 n = setup_new_neighbour (&obm->peer);
3194 while ((tc != NULL) && (tc->client != client))
3198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3199 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
3201 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
3203 transmit_to_peer (tc, NULL, ntohl (obm->priority),
3204 GNUNET_TIME_relative_ntoh (obm->timeout),
3206 ntohs (obmm->size), GNUNET_NO, n);
3207 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3212 * Handle SET_QUOTA-message.
3214 * @param cls closure (always NULL)
3215 * @param client identification of the client
3216 * @param message the actual message
3219 handle_set_quota (void *cls,
3220 struct GNUNET_SERVER_Client *client,
3221 const struct GNUNET_MessageHeader *message)
3223 const struct QuotaSetMessage *qsm =
3224 (const struct QuotaSetMessage *) message;
3225 struct NeighbourList *n;
3227 GNUNET_STATISTICS_update (stats,
3228 gettext_noop ("# SET QUOTA messages received"),
3231 n = find_neighbour (&qsm->peer);
3234 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3235 GNUNET_STATISTICS_update (stats,
3236 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
3242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3243 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
3245 (unsigned int) ntohl (qsm->quota.value__),
3246 (unsigned int) n->in_tracker.available_bytes_per_s__,
3247 GNUNET_i2s (&qsm->peer));
3249 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
3251 if (0 == ntohl (qsm->quota.value__))
3252 disconnect_neighbour (n, GNUNET_NO);
3253 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3258 transmit_address_to_client (void *cls, const char *address)
3260 struct GNUNET_SERVER_TransmitContext *tc = cls;
3263 if (NULL == address)
3266 slen = strlen (address) + 1;
3267 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
3268 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3269 if (NULL == address)
3270 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
3275 * Handle AddressLookup-message.
3277 * @param cls closure (always NULL)
3278 * @param client identification of the client
3279 * @param message the actual message
3282 handle_address_lookup (void *cls,
3283 struct GNUNET_SERVER_Client *client,
3284 const struct GNUNET_MessageHeader *message)
3286 const struct AddressLookupMessage *alum;
3287 struct TransportPlugin *lsPlugin;
3288 const char *nameTransport;
3289 const char *address;
3291 struct GNUNET_SERVER_TransmitContext *tc;
3293 size = ntohs (message->size);
3294 if (size < sizeof (struct AddressLookupMessage))
3296 GNUNET_break_op (0);
3297 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3300 alum = (const struct AddressLookupMessage *) message;
3301 uint32_t addressLen = ntohl (alum->addrlen);
3302 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
3304 GNUNET_break_op (0);
3305 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3308 address = (const char *) &alum[1];
3309 nameTransport = (const char *) &address[addressLen];
3311 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
3313 GNUNET_break_op (0);
3314 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3317 struct GNUNET_TIME_Absolute timeout =
3318 GNUNET_TIME_absolute_ntoh (alum->timeout);
3319 struct GNUNET_TIME_Relative rtimeout =
3320 GNUNET_TIME_absolute_get_remaining (timeout);
3321 lsPlugin = find_transport (nameTransport);
3322 if (NULL == lsPlugin)
3324 tc = GNUNET_SERVER_transmit_context_create (client);
3325 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
3326 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3327 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
3330 tc = GNUNET_SERVER_transmit_context_create (client);
3331 lsPlugin->api->address_pretty_printer (cls, nameTransport,
3332 address, addressLen, GNUNET_YES,
3334 &transmit_address_to_client, tc);
3338 * List of handlers for the messages understood by this
3341 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3342 {&handle_start, NULL,
3343 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
3344 {&handle_hello, NULL,
3345 GNUNET_MESSAGE_TYPE_HELLO, 0},
3346 {&handle_send, NULL,
3347 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
3348 {&handle_set_quota, NULL,
3349 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
3350 {&handle_address_lookup, NULL,
3351 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
3358 * Setup the environment for this plugin.
3361 create_environment (struct TransportPlugin *plug)
3363 plug->env.cfg = cfg;
3364 plug->env.sched = sched;
3365 plug->env.my_identity = &my_identity;
3366 plug->env.cls = plug;
3367 plug->env.receive = &plugin_env_receive;
3368 plug->env.notify_address = &plugin_env_notify_address;
3369 plug->env.max_connections = max_connect_per_transport;
3370 plug->env.stats = stats;
3375 * Start the specified transport (load the plugin).
3378 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
3380 struct TransportPlugin *plug;
3383 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3384 _("Loading `%s' transport plugin\n"), name);
3385 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
3386 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
3387 create_environment (plug);
3388 plug->short_name = GNUNET_strdup (name);
3389 plug->lib_name = libname;
3390 plug->next = plugins;
3392 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
3393 if (plug->api == NULL)
3395 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3396 _("Failed to load transport plugin for `%s'\n"), name);
3397 GNUNET_free (plug->short_name);
3398 plugins = plug->next;
3399 GNUNET_free (libname);
3406 * Called whenever a client is disconnected. Frees our
3407 * resources associated with that client.
3409 * @param cls closure
3410 * @param client identification of the client
3413 client_disconnect_notification (void *cls,
3414 struct GNUNET_SERVER_Client *client)
3416 struct TransportClient *pos;
3417 struct TransportClient *prev;
3418 struct ClientMessageQueueEntry *mqe;
3423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3424 "Client disconnected, cleaning up.\n");
3428 while ((pos != NULL) && (pos->client != client))
3435 while (NULL != (mqe = pos->message_queue_head))
3437 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
3438 pos->message_queue_tail,
3440 pos->message_count--;
3444 clients = pos->next;
3446 prev->next = pos->next;
3447 if (GNUNET_YES == pos->tcs_pending)
3452 if (pos->th != NULL)
3454 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
3457 GNUNET_break (0 == pos->message_count);
3463 * Iterator to free entries in the validation_map.
3465 * @param cls closure (unused)
3466 * @param key current key code
3467 * @param value value in the hash map (validation to abort)
3468 * @return GNUNET_YES (always)
3471 abort_validation (void *cls,
3472 const GNUNET_HashCode * key,
3475 struct ValidationEntry *va = value;
3477 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
3478 GNUNET_free (va->transport_name);
3485 * Function called when the service shuts down. Unloads our plugins
3486 * and cancels pending validations.
3488 * @param cls closure, unused
3489 * @param tc task context (unused)
3492 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3494 struct TransportPlugin *plug;
3495 struct OwnAddressList *al;
3496 struct CheckHelloValidatedContext *chvc;
3498 while (neighbours != NULL)
3499 disconnect_neighbour (neighbours, GNUNET_NO);
3501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3502 "Transport service is unloading plugins...\n");
3504 while (NULL != (plug = plugins))
3506 plugins = plug->next;
3507 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3508 GNUNET_free (plug->lib_name);
3509 GNUNET_free (plug->short_name);
3510 while (NULL != (al = plug->addresses))
3512 plug->addresses = al->next;
3517 if (my_private_key != NULL)
3518 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3519 GNUNET_free_non_null (our_hello);
3521 /* free 'chvc' data structure */
3522 while (NULL != (chvc = chvc_head))
3524 chvc_head = chvc->next;
3525 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
3530 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3533 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3534 validation_map = NULL;
3537 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3544 * Initiate transport service.
3546 * @param cls closure
3547 * @param s scheduler to use
3548 * @param serv the initialized server
3549 * @param c configuration to use
3553 struct GNUNET_SCHEDULER_Handle *s,
3554 struct GNUNET_SERVER_Handle *serv,
3555 const struct GNUNET_CONFIGURATION_Handle *c)
3560 unsigned long long tneigh;
3565 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
3566 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
3567 /* parse configuration */
3569 GNUNET_CONFIGURATION_get_value_number (c,
3574 GNUNET_CONFIGURATION_get_value_filename (c,
3576 "HOSTKEY", &keyfile)))
3578 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3580 ("Transport service is lacking key configuration settings. Exiting.\n"));
3581 GNUNET_SCHEDULER_shutdown (s);
3584 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3587 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3588 validation_map = NULL;
3591 max_connect_per_transport = (uint32_t) tneigh;
3592 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3593 GNUNET_free (keyfile);
3594 if (my_private_key == NULL)
3596 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3598 ("Transport service could not access hostkey. Exiting.\n"));
3599 GNUNET_SCHEDULER_shutdown (s);
3602 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3605 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3606 validation_map = NULL;
3609 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3610 GNUNET_CRYPTO_hash (&my_public_key,
3611 sizeof (my_public_key), &my_identity.hashPubKey);
3612 /* setup notification */
3614 GNUNET_SERVER_disconnect_notify (server,
3615 &client_disconnect_notification, NULL);
3616 /* load plugins... */
3619 GNUNET_CONFIGURATION_get_value_string (c,
3620 "TRANSPORT", "PLUGINS", &plugs))
3622 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3623 _("Starting transport plugins `%s'\n"), plugs);
3624 pos = strtok (plugs, " ");
3627 start_transport (server, pos);
3629 pos = strtok (NULL, " ");
3631 GNUNET_free (plugs);
3633 GNUNET_SCHEDULER_add_delayed (sched,
3634 GNUNET_TIME_UNIT_FOREVER_REL,
3635 &shutdown_task, NULL);
3640 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3642 /* process client requests */
3643 GNUNET_SERVER_add_handlers (server, handlers);
3648 * The main function for the transport service.
3650 * @param argc number of arguments from the command line
3651 * @param argv command line arguments
3652 * @return 0 ok, 1 on error
3655 main (int argc, char *const *argv)
3657 return (GNUNET_OK ==
3658 GNUNET_SERVICE_run (argc,
3661 GNUNET_SERVICE_OPTION_NONE,
3662 &run, NULL)) ? 0 : 1;
3665 /* end of gnunet-service-transport.c */