2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
28 #include "gnunet_client_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_os_lib.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_plugin_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_service_lib.h"
38 #include "gnunet_signatures.h"
39 #include "plugin_transport.h"
40 #include "transport.h"
42 #define DEBUG_BLACKLIST GNUNET_NO
44 #define DEBUG_PING_PONG GNUNET_NO
46 #define SIGN_USELESS GNUNET_NO
49 * Should we do some additional checks (to validate behavior
52 #define EXTRA_CHECKS GNUNET_YES
55 * How many messages can we have pending for a given client process
56 * before we start to drop incoming messages? We typically should
57 * have only one client and so this would be the primary buffer for
58 * messages, so the number should be chosen rather generously.
60 * The expectation here is that most of the time the queue is large
61 * enough so that a drop is virtually never required.
63 #define MAX_PENDING 128
66 * Size of the per-transport blacklist hash maps.
68 #define TRANSPORT_BLACKLIST_HT_SIZE 16
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, 15)
101 * Priority to use for PONG messages.
103 #define TRANSPORT_PONG_PRIORITY 4
106 * How often do we re-add (cheaper) plugins to our list of plugins
107 * to try for a given connected peer?
109 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
112 * After how long do we expire an address in a HELLO that we just
113 * validated? This value is also used for our own addresses when we
116 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
120 * How long before an existing address expires should we again try to
121 * validate it? Must be (significantly) smaller than
122 * HELLO_ADDRESS_EXPIRATION.
124 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
127 * Maximum frequency for re-evaluating latencies for all transport addresses.
129 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
132 * Maximum frequency for re-evaluating latencies for connected addresses.
134 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 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;
170 * Session (or NULL if no valid session currently exists or if the
171 * plugin does not use sessions).
173 struct Session *session;
176 * What was the last latency observed for this address, plugin and peer?
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 * How often have we tried to connect using this plugin? Used to
191 * discriminate against addresses that do not work well.
192 * FIXME: not yet used, but should be!
194 unsigned int connect_attempts;
197 * DV distance to this peer (1 if no DV is used).
198 * FIXME: need to set this from transport plugins!
208 * Have we ever estimated the latency of this address? Used to
209 * ensure that the first time we add an address, we immediately
215 * Are we currently connected via this address? The first time we
216 * successfully transmit or receive data to a peer via a particular
217 * address, we set this to GNUNET_YES. If we later get an error
218 * (disconnect notification, transmission failure, timeout), we set
219 * it back to GNUNET_NO.
224 * Is this plugin currently busy transmitting to the specific target?
225 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
226 * messages do not count as 'in transmit'.
231 * Has this address been validated yet?
239 * Entry in linked list of network addresses for ourselves.
241 struct OwnAddressList
244 * This is a linked list.
246 struct OwnAddressList *next;
249 * The address, actually a pointer to the end
250 * of this struct. Do not free!
255 * How long until we auto-expire this address (unless it is
256 * re-confirmed by the transport)?
258 struct GNUNET_TIME_Absolute expires;
269 * Entry in linked list of all of our plugins.
271 struct TransportPlugin
275 * This is a linked list.
277 struct TransportPlugin *next;
280 * API of the transport as returned by the plugin's
281 * initialization function.
283 struct GNUNET_TRANSPORT_PluginFunctions *api;
286 * Short name for the plugin (i.e. "tcp").
291 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
296 * List of our known addresses for this transport.
298 struct OwnAddressList *addresses;
301 * Environment this transport service is using
304 struct GNUNET_TRANSPORT_PluginEnvironment env;
307 * ID of task that is used to clean up expired addresses.
309 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
312 * Set to GNUNET_YES if we need to scrap the existing list of
313 * "addresses" and start fresh when we receive the next address
314 * update from a transport. Set to GNUNET_NO if we should just add
315 * the new address to the list and wait for the commit call.
320 * Hashmap of blacklisted peers for this particular transport.
322 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
325 struct NeighbourList;
328 * For each neighbour we keep a list of messages
329 * that we still want to transmit to the neighbour.
335 * This is a doubly linked list.
337 struct MessageQueue *next;
340 * This is a doubly linked list.
342 struct MessageQueue *prev;
345 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
346 * stuck together in memory. Allocated at the end of this struct.
348 const char *message_buf;
351 * Size of the message buf
353 size_t message_buf_size;
356 * Client responsible for queueing the message;
357 * used to check that a client has no two messages
358 * pending for the same target. Can be NULL.
360 struct TransportClient *client;
363 * Using which specific address should we send this message?
365 struct ForeignAddressList *specific_address;
368 * Peer ID of the Neighbour this entry belongs to.
370 struct GNUNET_PeerIdentity neighbour_id;
373 * Plugin that we used for the transmission.
374 * NULL until we scheduled a transmission.
376 struct TransportPlugin *plugin;
379 * At what time should we fail?
381 struct GNUNET_TIME_Absolute timeout;
384 * Internal message of the transport system that should not be
385 * included in the usual SEND-SEND_OK transmission confirmation
386 * traffic management scheme. Typically, "internal_msg" will
387 * be set whenever "client" is NULL (but it is not strictly
393 * How important is the message?
395 unsigned int priority;
401 * For a given Neighbour, which plugins are available
402 * to talk to this peer and what are their costs?
407 * This is a linked list.
409 struct ReadyList *next;
412 * Which of our transport plugins does this entry
415 struct TransportPlugin *plugin;
418 * Transport addresses, latency, and readiness for
419 * this particular plugin.
421 struct ForeignAddressList *addresses;
424 * To which neighbour does this ready list belong to?
426 struct NeighbourList *neighbour;
432 * Entry in linked list of all of our current neighbours.
438 * This is a linked list.
440 struct NeighbourList *next;
443 * Which of our transports is connected to this peer
444 * and what is their status?
446 struct ReadyList *plugins;
449 * Head of list of messages we would like to send to this peer;
450 * must contain at most one message per client.
452 struct MessageQueue *messages_head;
455 * Tail of list of messages we would like to send to this peer; must
456 * contain at most one message per client.
458 struct MessageQueue *messages_tail;
461 * Buffer for at most one payload message used when we receive
462 * payload data before our PING-PONG has succeeded. We then
463 * store such messages in this intermediary buffer until the
464 * connection is fully up.
466 struct GNUNET_MessageHeader *pre_connect_message_buffer;
469 * Context for peerinfo iteration.
470 * NULL after we are done processing peerinfo's information.
472 struct GNUNET_PEERINFO_IteratorContext *piter;
475 * Public key for this peer. Valid only if the respective flag is set below.
477 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
480 * Identity of this neighbour.
482 struct GNUNET_PeerIdentity id;
485 * ID of task scheduled to run when this peer is about to
486 * time out (will free resources associated with the peer).
488 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
491 * ID of task scheduled to run when we should retry transmitting
492 * the head of the message queue. Actually triggered when the
493 * transmission is timing out (we trigger instantly when we have
494 * a chance of success).
496 GNUNET_SCHEDULER_TaskIdentifier retry_task;
499 * How long until we should consider this peer dead
500 * (if we don't receive another message in the
503 struct GNUNET_TIME_Absolute peer_timeout;
506 * Tracker for inbound bandwidth.
508 struct GNUNET_BANDWIDTH_Tracker in_tracker;
511 * The latency we have seen for this particular address for
512 * this particular peer. This latency may have been calculated
513 * over multiple transports. This value reflects how long it took
514 * us to receive a response when SENDING via this particular
515 * transport/neighbour/address combination!
517 * FIXME: we need to periodically send PINGs to update this
518 * latency (at least more often than the current "huge" (11h?)
521 struct GNUNET_TIME_Relative latency;
524 * How often has the other peer (recently) violated the
525 * inbound traffic limit? Incremented by 10 per violation,
526 * decremented by 1 per non-violation (for each
529 unsigned int quota_violation_count;
532 * DV distance to this peer (1 if no DV is used).
537 * Have we seen an PONG from this neighbour in the past (and
538 * not had a disconnect since)?
543 * Do we have a valid public key for this neighbour?
545 int public_key_valid;
550 * Message used to ask a peer to validate receipt (to check an address
553 struct TransportPingMessage
557 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
559 struct GNUNET_MessageHeader header;
562 * Random challenge number (in network byte order).
564 uint32_t challenge GNUNET_PACKED;
567 * Who is the intended recipient?
569 struct GNUNET_PeerIdentity target;
575 * Message used to validate a HELLO. The challenge is included in the
576 * confirmation to make matching of replies to requests possible. The
577 * signature signs the original challenge number, our public key, the
578 * sender's address (so that the sender can check that the address we
579 * saw is plausible for him and possibly detect a MiM attack) and a
580 * timestamp (to limit replay).<p>
582 * This message is followed by the address of the
583 * client that we are observing (which is part of what
586 struct TransportPongMessage
590 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
592 struct GNUNET_MessageHeader header;
595 * For padding, always zero.
597 uint32_t reserved GNUNET_PACKED;
602 struct GNUNET_CRYPTO_RsaSignature signature;
605 * What are we signing and why?
607 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
610 * Random challenge number (in network byte order).
612 uint32_t challenge GNUNET_PACKED;
615 * Who signed this message?
617 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
620 * Size of address appended to this message
628 * Linked list of messages to be transmitted to the client. Each
629 * entry is followed by the actual message.
631 struct ClientMessageQueueEntry
634 * This is a doubly-linked list.
636 struct ClientMessageQueueEntry *next;
639 * This is a doubly-linked list.
641 struct ClientMessageQueueEntry *prev;
646 * Client connected to the transport service.
648 struct TransportClient
652 * This is a linked list.
654 struct TransportClient *next;
657 * Handle to the client.
659 struct GNUNET_SERVER_Client *client;
662 * Linked list of messages yet to be transmitted to
665 struct ClientMessageQueueEntry *message_queue_head;
668 * Tail of linked list of messages yet to be transmitted to the
671 struct ClientMessageQueueEntry *message_queue_tail;
674 * Current transmit request handle.
676 struct GNUNET_CONNECTION_TransmitHandle *th;
679 * Is a call to "transmit_send_continuation" pending? If so, we
680 * must not free this struct (even if the corresponding client
681 * disconnects) and instead only remove it from the linked list and
682 * set the "client" field to NULL.
687 * Length of the list of messages pending for this client.
689 unsigned int message_count;
695 * Entry in map of all HELLOs awaiting validation.
697 struct ValidationEntry
701 * The address, actually a pointer to the end
702 * of this struct. Do not free!
707 * Name of the transport.
709 char *transport_name;
712 * The public key of the peer.
714 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
717 * ID of task that will clean up this entry if we don't succeed
718 * with the validation first.
720 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
723 * At what time did we send this validation?
725 struct GNUNET_TIME_Absolute send_time;
728 * Session being validated (or NULL for none).
730 struct Session *session;
733 * Challenge number we used.
746 * Context of currently active requests to peerinfo
747 * for validation of HELLOs.
749 struct CheckHelloValidatedContext
753 * This is a doubly-linked list.
755 struct CheckHelloValidatedContext *next;
758 * This is a doubly-linked list.
760 struct CheckHelloValidatedContext *prev;
763 * Hello that we are validating.
765 const struct GNUNET_HELLO_Message *hello;
768 * Context for peerinfo iteration.
769 * NULL after we are done processing peerinfo's information.
771 struct GNUNET_PEERINFO_IteratorContext *piter;
774 * Was a HELLO known for this peer to peerinfo?
785 static struct GNUNET_HELLO_Message *our_hello;
788 * "version" of "our_hello". Used to see if a given neighbour has
789 * already been sent the latest version of our HELLO message.
791 static unsigned int our_hello_version;
796 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
801 static struct GNUNET_PeerIdentity my_identity;
806 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
811 struct GNUNET_SCHEDULER_Handle *sched;
816 const struct GNUNET_CONFIGURATION_Handle *cfg;
819 * Linked list of all clients to this service.
821 static struct TransportClient *clients;
824 * All loaded plugins.
826 static struct TransportPlugin *plugins;
831 static struct GNUNET_SERVER_Handle *server;
834 * Handle to peerinfo service.
836 static struct GNUNET_PEERINFO_Handle *peerinfo;
839 * All known neighbours and their HELLOs.
841 static struct NeighbourList *neighbours;
844 * Number of neighbours we'd like to have.
846 static uint32_t max_connect_per_transport;
849 * Head of linked list.
851 static struct CheckHelloValidatedContext *chvc_head;
854 * Tail of linked list.
856 static struct CheckHelloValidatedContext *chvc_tail;
859 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
860 * of the given peer that we are currently validating).
862 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
865 * Handle for reporting statistics.
867 static struct GNUNET_STATISTICS_Handle *stats;
871 * The peer specified by the given neighbour has timed-out or a plugin
872 * has disconnected. We may either need to do nothing (other plugins
873 * still up), or trigger a full disconnect and clean up. This
874 * function updates our state and do the necessary notifications.
875 * Also notifies our clients that the neighbour is now officially
878 * @param n the neighbour list entry for the peer
879 * @param check should we just check if all plugins
880 * disconnected or must we ask all plugins to
883 static void disconnect_neighbour (struct NeighbourList *n, int check);
886 * Check the ready list for the given neighbour and if a plugin is
887 * ready for transmission (and if we have a message), do so!
889 * @param neighbour target peer for which to transmit
891 static void try_transmission_to_peer (struct NeighbourList *neighbour);
895 * Find an entry in the neighbour list for a particular peer.
897 * @return NULL if not found.
899 static struct NeighbourList *
900 find_neighbour (const struct GNUNET_PeerIdentity *key)
902 struct NeighbourList *head = neighbours;
904 while ((head != NULL) &&
905 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
912 * Find an entry in the transport list for a particular transport.
914 * @return NULL if not found.
916 static struct TransportPlugin *
917 find_transport (const char *short_name)
919 struct TransportPlugin *head = plugins;
920 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
926 * Is a particular peer blacklisted for a particular transport?
928 * @param peer the peer to check for
929 * @param plugin the plugin used to connect to the peer
931 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
934 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
937 if (plugin->blacklist != NULL)
939 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
943 _("Peer `%s:%s' is blacklisted!\n"),
944 plugin->short_name, GNUNET_i2s (peer));
955 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
957 struct TransportPlugin *plugin;
959 plugin = find_transport(transport_name);
960 if (plugin == NULL) /* Nothing to do */
962 if (plugin->blacklist == NULL)
963 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
964 GNUNET_assert(plugin->blacklist != NULL);
965 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
967 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
972 * Read the blacklist file, containing transport:peer entries.
973 * Provided the transport is loaded, set up hashmap with these
974 * entries to blacklist peers by transport.
978 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
985 struct GNUNET_PeerIdentity pid;
987 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
988 unsigned int entries_found;
989 char *transport_name;
992 GNUNET_CONFIGURATION_get_value_filename (cfg,
997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
998 _("Option `%s' in section `%s' not specified!\n"),
1003 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1004 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1005 | GNUNET_DISK_PERM_USER_WRITE);
1006 if (0 != STAT (fn, &frstat))
1008 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1009 _("Could not read blacklist file `%s'\n"), fn);
1013 if (frstat.st_size == 0)
1015 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1016 _("Blacklist file `%s' is empty.\n"),
1021 /* FIXME: use mmap */
1022 data = GNUNET_malloc_large (frstat.st_size);
1023 if (frstat.st_size !=
1024 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1026 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1027 _("Failed to read blacklist from `%s'\n"), fn);
1034 while ((pos < frstat.st_size) && isspace (data[pos]))
1036 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1037 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1040 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace (data[colon_pos]))
1043 if (colon_pos >= frstat.st_size)
1045 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1046 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1047 (unsigned long long) colon_pos);
1053 if (isspace(data[colon_pos]))
1055 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1056 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1057 (unsigned long long) colon_pos);
1059 while ((pos < frstat.st_size) && isspace (data[pos]))
1063 tsize = colon_pos - pos;
1064 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size))
1066 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1067 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1068 (unsigned long long) colon_pos);
1074 transport_name = GNUNET_malloc(tsize);
1075 memcpy(transport_name, &data[pos], tsize);
1076 pos = colon_pos + 1;
1079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1080 _("Read transport name %s in blacklist file.\n"),
1083 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1084 if (!isspace (enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1086 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1087 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1088 (unsigned long long) pos);
1090 while ((pos < frstat.st_size) && (!isspace (data[pos])))
1092 GNUNET_free_non_null(transport_name);
1095 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1096 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1098 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1099 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1100 (unsigned long long) pos,
1105 if (0 != memcmp (&pid,
1107 sizeof (struct GNUNET_PeerIdentity)))
1110 add_peer_to_blacklist (&pid,
1112 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1113 _("Found blacklisted peer `%s:%s' in configuration\n"),
1114 transport_name, GNUNET_i2s (&pid));
1118 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1119 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1123 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1124 GNUNET_free_non_null(transport_name);
1125 while ((pos < frstat.st_size) && isspace (data[pos]))
1134 * Function called to notify a client about the socket being ready to
1135 * queue more data. "buf" will be NULL and "size" zero if the socket
1136 * was closed for writing in the meantime.
1138 * @param cls closure
1139 * @param size number of bytes available in buf
1140 * @param buf where the callee should write the message
1141 * @return number of bytes written to buf
1144 transmit_to_client_callback (void *cls, size_t size, void *buf)
1146 struct TransportClient *client = cls;
1147 struct ClientMessageQueueEntry *q;
1150 const struct GNUNET_MessageHeader *msg;
1156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1157 "Transmission to client failed, closing connection.\n");
1158 /* fatal error with client, free message queue! */
1159 while (NULL != (q = client->message_queue_head))
1161 GNUNET_STATISTICS_update (stats,
1162 gettext_noop ("# bytes discarded (could not transmit to client)"),
1163 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1165 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1166 client->message_queue_tail,
1170 client->message_count = 0;
1175 while (NULL != (q = client->message_queue_head))
1177 msg = (const struct GNUNET_MessageHeader *) &q[1];
1178 msize = ntohs (msg->size);
1179 if (msize + tsize > size)
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Transmitting message of type %u to client.\n",
1186 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1187 client->message_queue_tail,
1189 memcpy (&cbuf[tsize], msg, msize);
1192 client->message_count--;
1196 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1197 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1199 GNUNET_TIME_UNIT_FOREVER_REL,
1200 &transmit_to_client_callback,
1202 GNUNET_assert (client->th != NULL);
1209 * Mark the given FAL entry as 'connected' (and hence preferred for
1210 * sending); also mark all others for the same peer as 'not connected'
1211 * (since only one can be preferred).
1213 * @param fal address to set to 'connected'
1216 mark_address_connected (struct ForeignAddressList *fal)
1218 struct ForeignAddressList *pos;
1221 GNUNET_assert (GNUNET_YES == fal->validated);
1222 if (fal->connected == GNUNET_YES)
1223 return; /* nothing to do */
1225 pos = fal->ready_list->addresses;
1228 if (GNUNET_YES == pos->connected)
1230 GNUNET_break (cnt == GNUNET_YES);
1232 pos->connected = GNUNET_NO;
1236 fal->connected = GNUNET_YES;
1237 if (GNUNET_YES == cnt)
1239 GNUNET_STATISTICS_update (stats,
1240 gettext_noop ("# connected addresses"),
1248 * Send the specified message to the specified client. Since multiple
1249 * messages may be pending for the same client at a time, this code
1250 * makes sure that no message is lost.
1252 * @param client client to transmit the message to
1253 * @param msg the message to send
1254 * @param may_drop can this message be dropped if the
1255 * message queue for this client is getting far too large?
1258 transmit_to_client (struct TransportClient *client,
1259 const struct GNUNET_MessageHeader *msg, int may_drop)
1261 struct ClientMessageQueueEntry *q;
1264 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1266 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1268 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
1269 client->message_count, MAX_PENDING);
1270 /* TODO: call to statistics... */
1273 msize = ntohs (msg->size);
1274 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1275 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1276 memcpy (&q[1], msg, msize);
1277 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1278 client->message_queue_tail,
1279 client->message_queue_tail,
1281 client->message_count++;
1282 if (client->th == NULL)
1284 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1286 GNUNET_TIME_UNIT_FOREVER_REL,
1287 &transmit_to_client_callback,
1289 GNUNET_assert (client->th != NULL);
1295 * Transmit a 'SEND_OK' notification to the given client for the
1298 * @param client who to notify
1299 * @param n neighbour to notify about
1300 * @param result status code for the transmission request
1303 transmit_send_ok (struct TransportClient *client,
1304 struct NeighbourList *n,
1307 struct SendOkMessage send_ok_msg;
1309 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1310 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1311 send_ok_msg.success = htonl (result);
1312 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1313 send_ok_msg.peer = n->id;
1314 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1319 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1320 * upon "completion" of a send request. This tells the API
1321 * that it is now legal to send another message to the given
1324 * @param cls closure, identifies the entry on the
1325 * message queue that was transmitted and the
1326 * client responsible for queueing the message
1327 * @param target the peer receiving the message
1328 * @param result GNUNET_OK on success, if the transmission
1329 * failed, we should not tell the client to transmit
1333 transmit_send_continuation (void *cls,
1334 const struct GNUNET_PeerIdentity *target,
1337 struct MessageQueue *mq = cls;
1338 struct NeighbourList *n;
1340 GNUNET_STATISTICS_update (stats,
1341 gettext_noop ("# bytes pending with plugins"),
1342 - (int64_t) mq->message_buf_size,
1344 if (result == GNUNET_OK)
1346 GNUNET_STATISTICS_update (stats,
1347 gettext_noop ("# bytes successfully transmitted by plugins"),
1348 mq->message_buf_size,
1353 GNUNET_STATISTICS_update (stats,
1354 gettext_noop ("# bytes with transmission failure by plugins"),
1355 mq->message_buf_size,
1358 n = find_neighbour(&mq->neighbour_id);
1359 GNUNET_assert (n != NULL);
1360 if (mq->specific_address != NULL)
1362 if (result == GNUNET_OK)
1364 mq->specific_address->timeout =
1365 GNUNET_TIME_relative_to_absolute
1366 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1367 if (mq->specific_address->validated == GNUNET_YES)
1368 mark_address_connected (mq->specific_address);
1372 if (mq->specific_address->connected != GNUNET_NO)
1374 GNUNET_STATISTICS_update (stats,
1375 gettext_noop ("# connected addresses"),
1378 mq->specific_address->connected = GNUNET_NO;
1381 if (! mq->internal_msg)
1382 mq->specific_address->in_transmit = GNUNET_NO;
1384 if (mq->client != NULL)
1385 transmit_send_ok (mq->client, n, result);
1387 try_transmission_to_peer (n);
1392 * Convert an address to a string.
1394 * @param plugin name of the plugin responsible for the address
1395 * @param addr binary address
1396 * @param addr_len number of bytes in addr
1397 * @return NULL on error, otherwise address string
1400 a2s (const char *plugin,
1404 struct TransportPlugin *p;
1408 p = find_transport (plugin);
1411 return p->api->address_to_string (p->api->cls,
1418 * Find an address in any of the available transports for
1419 * the given neighbour that would be good for message
1420 * transmission. This is essentially the transport selection
1423 * @param neighbour for whom to select an address
1424 * @return selected address, NULL if we have none
1426 struct ForeignAddressList *
1427 find_ready_address(struct NeighbourList *neighbour)
1429 struct ReadyList *head = neighbour->plugins;
1430 struct ForeignAddressList *addresses;
1431 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1432 struct ForeignAddressList *best_address;
1434 best_address = NULL;
1435 while (head != NULL)
1437 addresses = head->addresses;
1438 while (addresses != NULL)
1440 if ( (addresses->timeout.value < now.value) &&
1441 (addresses->connected == GNUNET_YES) )
1444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1445 "Marking long-time inactive connection to `%4s' as down.\n",
1446 GNUNET_i2s (&neighbour->id));
1448 GNUNET_STATISTICS_update (stats,
1449 gettext_noop ("# connected addresses"),
1452 addresses->connected = GNUNET_NO;
1454 addresses = addresses->next;
1457 addresses = head->addresses;
1458 while (addresses != NULL)
1460 #if DEBUG_TRANSPORT > 1
1461 if (addresses->addr != NULL)
1462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1463 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1464 a2s (head->plugin->short_name,
1466 addresses->addrlen),
1467 GNUNET_i2s (&neighbour->id),
1468 addresses->connected,
1469 addresses->in_transmit,
1470 addresses->validated,
1471 addresses->connect_attempts,
1472 (unsigned long long) addresses->timeout.value,
1473 (unsigned int) addresses->distance);
1475 if ( ( (best_address == NULL) ||
1476 (addresses->connected == GNUNET_YES) ||
1477 (best_address->connected == GNUNET_NO) ) &&
1478 (addresses->in_transmit == GNUNET_NO) &&
1479 ( (best_address == NULL) ||
1480 (addresses->latency.value < best_address->latency.value)) )
1481 best_address = addresses;
1482 /* FIXME: also give lower-latency addresses that are not
1483 connected a chance some times... */
1484 addresses = addresses->next;
1488 if (best_address != NULL)
1491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1492 "Best address found has latency of %llu ms.\n",
1493 best_address->latency.value);
1498 GNUNET_STATISTICS_update (stats,
1499 gettext_noop ("# transmission attempts failed (no address)"),
1503 return best_address;
1509 * We should re-try transmitting to the given peer,
1510 * hopefully we've learned something in the meantime.
1513 retry_transmission_task (void *cls,
1514 const struct GNUNET_SCHEDULER_TaskContext *tc)
1516 struct NeighbourList *n = cls;
1518 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1519 try_transmission_to_peer (n);
1524 * Check the ready list for the given neighbour and if a plugin is
1525 * ready for transmission (and if we have a message), do so!
1527 * @param neighbour target peer for which to transmit
1530 try_transmission_to_peer (struct NeighbourList *neighbour)
1532 struct ReadyList *rl;
1533 struct MessageQueue *mq;
1534 struct GNUNET_TIME_Relative timeout;
1538 if (neighbour->messages_head == NULL)
1541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1542 "Transmission queue for `%4s' is empty\n",
1543 GNUNET_i2s (&neighbour->id));
1545 return; /* nothing to do */
1548 mq = neighbour->messages_head;
1549 force_address = GNUNET_YES;
1550 if (mq->specific_address == NULL)
1552 mq->specific_address = find_ready_address(neighbour);
1553 GNUNET_STATISTICS_update (stats,
1554 gettext_noop ("# transport selected peer address freely"),
1557 force_address = GNUNET_NO;
1559 if (mq->specific_address == NULL)
1561 GNUNET_STATISTICS_update (stats,
1562 gettext_noop ("# transport failed to selected peer address"),
1565 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1566 if (timeout.value == 0)
1569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1570 "No destination address available to transmit message of size %u to peer `%4s'\n",
1571 mq->message_buf_size,
1572 GNUNET_i2s (&mq->neighbour_id));
1574 GNUNET_STATISTICS_update (stats,
1575 gettext_noop ("# bytes in message queue for other peers"),
1576 - (int64_t) mq->message_buf_size,
1578 GNUNET_STATISTICS_update (stats,
1579 gettext_noop ("# bytes discarded (no destination address available)"),
1580 mq->message_buf_size,
1582 if (mq->client != NULL)
1583 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1584 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1585 neighbour->messages_tail,
1588 return; /* nobody ready */
1590 GNUNET_STATISTICS_update (stats,
1591 gettext_noop ("# message delivery deferred (no address)"),
1594 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1595 GNUNET_SCHEDULER_cancel (sched,
1596 neighbour->retry_task);
1597 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1599 &retry_transmission_task,
1602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1603 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1604 mq->message_buf_size,
1605 GNUNET_i2s (&mq->neighbour_id),
1608 /* FIXME: might want to trigger peerinfo lookup here
1609 (unless that's already pending...) */
1612 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1613 neighbour->messages_tail,
1615 if (mq->specific_address->connected == GNUNET_NO)
1616 mq->specific_address->connect_attempts++;
1617 rl = mq->specific_address->ready_list;
1618 mq->plugin = rl->plugin;
1619 if (!mq->internal_msg)
1620 mq->specific_address->in_transmit = GNUNET_YES;
1622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1623 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1624 mq->message_buf_size,
1625 GNUNET_i2s (&neighbour->id),
1626 (mq->specific_address->addr != NULL)
1627 ? a2s (mq->plugin->short_name,
1628 mq->specific_address->addr,
1629 mq->specific_address->addrlen)
1631 rl->plugin->short_name);
1633 GNUNET_STATISTICS_update (stats,
1634 gettext_noop ("# bytes in message queue for other peers"),
1635 - (int64_t) mq->message_buf_size,
1637 GNUNET_STATISTICS_update (stats,
1638 gettext_noop ("# bytes pending with plugins"),
1639 mq->message_buf_size,
1641 ret = rl->plugin->api->send (rl->plugin->api->cls,
1644 mq->message_buf_size,
1646 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1647 mq->specific_address->session,
1648 mq->specific_address->addr,
1649 mq->specific_address->addrlen,
1651 &transmit_send_continuation, mq);
1654 /* failure, but 'send' would not call continuation in this case,
1655 so we need to do it here! */
1656 transmit_send_continuation (mq,
1664 * Send the specified message to the specified peer.
1666 * @param client source of the transmission request (can be NULL)
1667 * @param peer_address ForeignAddressList where we should send this message
1668 * @param priority how important is the message
1669 * @param timeout how long do we have to transmit?
1670 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1671 * @param message_buf_size total size of all messages in message_buf
1672 * @param is_internal is this an internal message; these are pre-pended and
1673 * also do not count for plugins being "ready" to transmit
1674 * @param neighbour handle to the neighbour for transmission
1677 transmit_to_peer (struct TransportClient *client,
1678 struct ForeignAddressList *peer_address,
1679 unsigned int priority,
1680 struct GNUNET_TIME_Relative timeout,
1681 const char *message_buf,
1682 size_t message_buf_size,
1683 int is_internal, struct NeighbourList *neighbour)
1685 struct MessageQueue *mq;
1690 /* check for duplicate submission */
1691 mq = neighbour->messages_head;
1694 if (mq->client == client)
1696 /* client transmitted to same peer twice
1697 before getting SEND_OK! */
1705 GNUNET_STATISTICS_update (stats,
1706 gettext_noop ("# bytes in message queue for other peers"),
1709 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1710 mq->specific_address = peer_address;
1711 mq->client = client;
1712 memcpy (&mq[1], message_buf, message_buf_size);
1713 mq->message_buf = (const char*) &mq[1];
1714 mq->message_buf_size = message_buf_size;
1715 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1716 mq->internal_msg = is_internal;
1717 mq->priority = priority;
1718 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1720 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1721 neighbour->messages_tail,
1724 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1725 neighbour->messages_tail,
1726 neighbour->messages_tail,
1728 try_transmission_to_peer (neighbour);
1735 struct GeneratorContext
1737 struct TransportPlugin *plug_pos;
1738 struct OwnAddressList *addr_pos;
1739 struct GNUNET_TIME_Absolute expiration;
1747 address_generator (void *cls, size_t max, void *buf)
1749 struct GeneratorContext *gc = cls;
1752 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1754 gc->plug_pos = gc->plug_pos->next;
1755 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1757 if (NULL == gc->plug_pos)
1762 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1765 gc->addr_pos->addrlen, buf, max);
1766 gc->addr_pos = gc->addr_pos->next;
1772 * Construct our HELLO message from all of the addresses of
1773 * all of the transports.
1778 struct GNUNET_HELLO_Message *hello;
1779 struct TransportClient *cpos;
1780 struct NeighbourList *npos;
1781 struct GeneratorContext gc;
1783 gc.plug_pos = plugins;
1784 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1785 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1786 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1789 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1791 GNUNET_STATISTICS_update (stats,
1792 gettext_noop ("# refreshed my HELLO"),
1796 while (cpos != NULL)
1798 transmit_to_client (cpos,
1799 (const struct GNUNET_MessageHeader *) hello,
1804 GNUNET_free_non_null (our_hello);
1806 our_hello_version++;
1807 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1809 while (npos != NULL)
1812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1813 "Transmitting updated `%s' to neighbour `%4s'\n",
1814 "HELLO", GNUNET_i2s (&npos->id));
1816 GNUNET_STATISTICS_update (stats,
1817 gettext_noop ("# transmitted my HELLO to other peers"),
1820 transmit_to_peer (NULL, NULL, 0,
1821 HELLO_ADDRESS_EXPIRATION,
1822 (const char *) our_hello,
1823 GNUNET_HELLO_size(our_hello),
1831 * Task used to clean up expired addresses for a plugin.
1833 * @param cls closure
1837 expire_address_task (void *cls,
1838 const struct GNUNET_SCHEDULER_TaskContext *tc);
1842 * Update the list of addresses for this plugin,
1843 * expiring those that are past their expiration date.
1845 * @param plugin addresses of which plugin should be recomputed?
1846 * @param fresh set to GNUNET_YES if a new address was added
1847 * and we need to regenerate the HELLO even if nobody
1851 update_addresses (struct TransportPlugin *plugin, int fresh)
1853 static struct GNUNET_TIME_Absolute last_update;
1854 struct GNUNET_TIME_Relative min_remaining;
1855 struct GNUNET_TIME_Relative remaining;
1856 struct GNUNET_TIME_Absolute now;
1857 struct OwnAddressList *pos;
1858 struct OwnAddressList *prev;
1859 struct OwnAddressList *next;
1862 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1863 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1864 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1865 now = GNUNET_TIME_absolute_get ();
1866 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1867 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1869 pos = plugin->addresses;
1873 if (pos->expires.value < now.value)
1875 expired = GNUNET_YES;
1877 plugin->addresses = pos->next;
1879 prev->next = pos->next;
1884 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1885 if (remaining.value < min_remaining.value)
1886 min_remaining = remaining;
1892 if (expired || fresh)
1897 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1898 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1900 plugin->address_update_task
1901 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1903 &expire_address_task, plugin);
1908 * Task used to clean up expired addresses for a plugin.
1910 * @param cls closure
1914 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1916 struct TransportPlugin *plugin = cls;
1918 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1919 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1920 update_addresses (plugin, GNUNET_NO);
1925 * Iterator over hash map entries that NULLs the session of validation
1926 * entries that match the given session.
1928 * @param cls closure (the 'struct Session*' to match against)
1929 * @param key current key code (peer ID, not used)
1930 * @param value value in the hash map ('struct ValidationEntry*')
1931 * @return GNUNET_YES (we should continue to iterate)
1934 remove_session_validations (void *cls,
1935 const GNUNET_HashCode * key,
1938 struct Session *session = cls;
1939 struct ValidationEntry *ve = value;
1941 if (session == ve->session)
1948 * Function that will be called whenever the plugin internally
1949 * cleans up a session pointer and hence the service needs to
1950 * discard all of those sessions as well. Plugins that do not
1951 * use sessions can simply omit calling this function and always
1952 * use NULL wherever a session pointer is needed.
1954 * @param cls closure
1955 * @param peer which peer was the session for
1956 * @param session which session is being destoyed
1959 plugin_env_session_end (void *cls,
1960 const struct GNUNET_PeerIdentity *peer,
1961 struct Session *session)
1963 struct TransportPlugin *p = cls;
1964 struct NeighbourList *nl;
1965 struct ReadyList *rl;
1966 struct ForeignAddressList *pos;
1967 struct ForeignAddressList *prev;
1969 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
1970 &remove_session_validations,
1972 nl = find_neighbour (peer);
1978 if (rl->plugin == p)
1985 pos = rl->addresses;
1986 while ( (pos != NULL) &&
1987 (pos->session != session) )
1994 pos->session = NULL;
1995 if (pos->addrlen != 0)
1998 rl->addresses = pos->next;
2000 prev->next = pos->next;
2001 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2003 GNUNET_SCHEDULER_cancel (sched,
2004 pos->revalidate_task);
2005 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2008 if (nl->received_pong == GNUNET_NO)
2009 return; /* nothing to do */
2010 /* check if we have any validated addresses left */
2011 pos = rl->addresses;
2018 /* no valid addresses left, signal disconnect! */
2019 disconnect_neighbour (nl, GNUNET_NO);
2024 * Function that must be called by each plugin to notify the
2025 * transport service about the addresses under which the transport
2026 * provided by the plugin can be reached.
2028 * @param cls closure
2029 * @param name name of the transport that generated the address
2030 * @param addr one of the addresses of the host, NULL for the last address
2031 * the specific address format depends on the transport
2032 * @param addrlen length of the address
2033 * @param expires when should this address automatically expire?
2036 plugin_env_notify_address (void *cls,
2040 struct GNUNET_TIME_Relative expires)
2042 struct TransportPlugin *p = cls;
2043 struct OwnAddressList *al;
2044 struct GNUNET_TIME_Absolute abex;
2046 GNUNET_assert (addr != NULL);
2047 abex = GNUNET_TIME_relative_to_absolute (expires);
2048 GNUNET_assert (p == find_transport (name));
2052 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2054 if (al->expires.value < abex.value)
2061 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2063 al->next = p->addresses;
2066 al->addrlen = addrlen;
2067 memcpy (&al[1], addr, addrlen);
2068 update_addresses (p, GNUNET_YES);
2073 * Notify all of our clients about a peer connecting.
2076 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2077 struct GNUNET_TIME_Relative latency,
2080 struct ConnectInfoMessage cim;
2081 struct TransportClient *cpos;
2084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2085 "Notifying clients about connection from `%s'\n",
2088 GNUNET_STATISTICS_update (stats,
2089 gettext_noop ("# peers connected"),
2092 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2093 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2094 cim.distance = htonl (distance);
2095 cim.latency = GNUNET_TIME_relative_hton (latency);
2096 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2098 while (cpos != NULL)
2100 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2107 * Notify all of our clients about a peer disconnecting.
2110 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2112 struct DisconnectInfoMessage dim;
2113 struct TransportClient *cpos;
2116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2117 "Notifying clients about lost connection to `%s'\n",
2120 GNUNET_STATISTICS_update (stats,
2121 gettext_noop ("# peers connected"),
2124 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2125 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2126 dim.reserved = htonl (0);
2127 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2129 while (cpos != NULL)
2131 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2138 * Find a ForeignAddressList entry for the given neighbour
2139 * that matches the given address and transport.
2141 * @param neighbour which peer we care about
2142 * @param tname name of the transport plugin
2143 * @param session session to look for, NULL for 'any'; otherwise
2144 * can be used for the service to "learn" this session ID
2146 * @param addr binary address
2147 * @param addrlen length of addr
2148 * @return NULL if no such entry exists
2150 static struct ForeignAddressList *
2151 find_peer_address(struct NeighbourList *neighbour,
2153 struct Session *session,
2157 struct ReadyList *head;
2158 struct ForeignAddressList *pos;
2160 head = neighbour->plugins;
2161 while (head != NULL)
2163 if (0 == strcmp (tname, head->plugin->short_name))
2169 pos = head->addresses;
2170 while ( (pos != NULL) &&
2171 ( (pos->addrlen != addrlen) ||
2172 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2174 if ( (session != NULL) &&
2175 (pos->session == session) )
2179 if ( (session != NULL) && (pos != NULL) )
2180 pos->session = session; /* learn it! */
2186 * Get the peer address struct for the given neighbour and
2187 * address. If it doesn't yet exist, create it.
2189 * @param neighbour which peer we care about
2190 * @param tname name of the transport plugin
2191 * @param session session of the plugin, or NULL for none
2192 * @param addr binary address
2193 * @param addrlen length of addr
2194 * @return NULL if we do not have a transport plugin for 'tname'
2196 static struct ForeignAddressList *
2197 add_peer_address (struct NeighbourList *neighbour,
2199 struct Session *session,
2203 struct ReadyList *head;
2204 struct ForeignAddressList *ret;
2206 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2209 head = neighbour->plugins;
2211 while (head != NULL)
2213 if (0 == strcmp (tname, head->plugin->short_name))
2219 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2220 ret->session = session;
2223 ret->addr = (const char*) &ret[1];
2224 memcpy (&ret[1], addr, addrlen);
2230 ret->addrlen = addrlen;
2231 ret->expires = GNUNET_TIME_relative_to_absolute
2232 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2233 ret->latency = GNUNET_TIME_relative_get_forever();
2235 ret->timeout = GNUNET_TIME_relative_to_absolute
2236 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2237 ret->ready_list = head;
2238 ret->next = head->addresses;
2239 head->addresses = ret;
2245 * Closure for 'add_validated_address'.
2247 struct AddValidatedAddressContext
2250 * Entry that has been validated.
2252 const struct ValidationEntry *ve;
2255 * Flag set after we have added the address so
2256 * that we terminate the iteration next time.
2263 * Callback function used to fill a buffer of max bytes with a list of
2264 * addresses in the format used by HELLOs. Should use
2265 * "GNUNET_HELLO_add_address" as a helper function.
2267 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2268 * @param max maximum number of bytes that can be written to buf
2269 * @param buf where to write the address information
2270 * @return number of bytes written, 0 to signal the
2271 * end of the iteration.
2274 add_validated_address (void *cls,
2275 size_t max, void *buf)
2277 struct AddValidatedAddressContext *avac = cls;
2278 const struct ValidationEntry *ve = avac->ve;
2280 if (GNUNET_YES == avac->done)
2282 avac->done = GNUNET_YES;
2283 return GNUNET_HELLO_add_address (ve->transport_name,
2284 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2294 * Closure for 'check_address_exists'.
2296 struct CheckAddressExistsClosure
2299 * Address to check for.
2304 * Name of the transport.
2311 struct Session *session;
2314 * Set to GNUNET_YES if the address exists.
2327 * Iterator over hash map entries. Checks if the given
2328 * validation entry is for the same address as what is given
2331 * @param cls the 'struct CheckAddressExistsClosure*'
2332 * @param key current key code (ignored)
2333 * @param value value in the hash map ('struct ValidationEntry')
2334 * @return GNUNET_YES if we should continue to
2335 * iterate (mismatch), GNUNET_NO if not (entry matched)
2338 check_address_exists (void *cls,
2339 const GNUNET_HashCode * key,
2342 struct CheckAddressExistsClosure *caec = cls;
2343 struct ValidationEntry *ve = value;
2345 if ( (0 == strcmp (caec->tname,
2346 ve->transport_name)) &&
2347 (caec->addrlen == ve->addrlen) &&
2348 (0 == memcmp (caec->addr,
2352 caec->exists = GNUNET_YES;
2355 if ( (ve->session != NULL) &&
2356 (caec->session == ve->session) )
2358 caec->exists = GNUNET_YES;
2366 * HELLO validation cleanup task (validation failed).
2368 * @param cls the 'struct ValidationEntry' that failed
2369 * @param tc scheduler context (unused)
2372 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2374 struct ValidationEntry *va = cls;
2375 struct GNUNET_PeerIdentity pid;
2377 GNUNET_STATISTICS_update (stats,
2378 gettext_noop ("# address validation timeouts"),
2381 GNUNET_CRYPTO_hash (&va->publicKey,
2383 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2385 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2388 GNUNET_free (va->transport_name);
2394 neighbour_timeout_task (void *cls,
2395 const struct GNUNET_SCHEDULER_TaskContext *tc)
2397 struct NeighbourList *n = cls;
2400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2401 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2403 GNUNET_STATISTICS_update (stats,
2404 gettext_noop ("# disconnects due to timeout"),
2407 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2408 disconnect_neighbour (n, GNUNET_NO);
2413 * Schedule the job that will cause us to send a PING to the
2414 * foreign address to evaluate its validity and latency.
2416 * @param fal address to PING
2419 schedule_next_ping (struct ForeignAddressList *fal);
2423 * Add the given address to the list of foreign addresses
2424 * available for the given peer (check for duplicates).
2426 * @param cls the respective 'struct NeighbourList' to update
2427 * @param tname name of the transport
2428 * @param expiration expiration time
2429 * @param addr the address
2430 * @param addrlen length of the address
2431 * @return GNUNET_OK (always)
2434 add_to_foreign_address_list (void *cls,
2436 struct GNUNET_TIME_Absolute expiration,
2440 struct NeighbourList *n = cls;
2441 struct ForeignAddressList *fal;
2444 GNUNET_STATISTICS_update (stats,
2445 gettext_noop ("# valid peer addresses returned by peerinfo"),
2449 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2454 "Adding address `%s' (%s) for peer `%4s' due to peerinfo data for %llums.\n",
2455 a2s (tname, addr, addrlen),
2457 GNUNET_i2s (&n->id),
2460 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2463 GNUNET_STATISTICS_update (stats,
2464 gettext_noop ("# previously validated addresses lacking transport"),
2470 fal->expires = GNUNET_TIME_absolute_max (expiration,
2472 schedule_next_ping (fal);
2478 fal->expires = GNUNET_TIME_absolute_max (expiration,
2483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2484 "Failed to add new address for `%4s'\n",
2485 GNUNET_i2s (&n->id));
2488 if (fal->validated == GNUNET_NO)
2490 fal->validated = GNUNET_YES;
2491 GNUNET_STATISTICS_update (stats,
2492 gettext_noop ("# peer addresses considered valid"),
2496 if (try == GNUNET_YES)
2498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2499 "Have new addresses, will try to trigger transmissions.\n");
2500 try_transmission_to_peer (n);
2507 * Add addresses in validated HELLO "h" to the set of addresses
2508 * we have for this peer.
2510 * @param cls closure ('struct NeighbourList*')
2511 * @param peer id of the peer, NULL for last call
2512 * @param h hello message for the peer (can be NULL)
2513 * @param trust amount of trust we have in the peer (not used)
2516 add_hello_for_peer (void *cls,
2517 const struct GNUNET_PeerIdentity *peer,
2518 const struct GNUNET_HELLO_Message *h,
2521 struct NeighbourList *n = cls;
2529 return; /* no HELLO available */
2531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2532 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2536 if (GNUNET_YES != n->public_key_valid)
2538 GNUNET_HELLO_get_key (h, &n->publicKey);
2539 n->public_key_valid = GNUNET_YES;
2541 GNUNET_HELLO_iterate_addresses (h,
2543 &add_to_foreign_address_list,
2549 * Create a fresh entry in our neighbour list for the given peer.
2550 * Will try to transmit our current HELLO to the new neighbour.
2551 * Do not call this function directly, use 'setup_peer_check_blacklist.
2553 * @param peer the peer for which we create the entry
2554 * @param do_hello should we schedule transmitting a HELLO
2555 * @return the new neighbour list entry
2557 static struct NeighbourList *
2558 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2561 struct NeighbourList *n;
2562 struct TransportPlugin *tp;
2563 struct ReadyList *rl;
2565 GNUNET_assert (our_hello != NULL);
2566 GNUNET_STATISTICS_update (stats,
2567 gettext_noop ("# active neighbours"),
2570 n = GNUNET_malloc (sizeof (struct NeighbourList));
2571 n->next = neighbours;
2575 GNUNET_TIME_relative_to_absolute
2576 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2577 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2578 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2579 MAX_BANDWIDTH_CARRY_S);
2583 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2585 rl = GNUNET_malloc (sizeof (struct ReadyList));
2587 rl->next = n->plugins;
2590 rl->addresses = NULL;
2594 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2596 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2597 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2598 &neighbour_timeout_task, n);
2601 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2602 0, GNUNET_TIME_UNIT_FOREVER_REL,
2603 &add_hello_for_peer, n);
2604 transmit_to_peer (NULL, NULL, 0,
2605 HELLO_ADDRESS_EXPIRATION,
2606 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2614 * Function called after we have checked if communicating
2615 * with a given peer is acceptable.
2617 * @param cls closure
2618 * @param n NULL if communication is not acceptable
2620 typedef void (*SetupContinuation)(void *cls,
2621 struct NeighbourList *n);
2625 * Information kept for each client registered to perform
2631 * This is a linked list.
2633 struct Blacklisters *next;
2636 * This is a linked list.
2638 struct Blacklisters *prev;
2641 * Client responsible for this entry.
2643 struct GNUNET_SERVER_Client *client;
2646 * Blacklist check that we're currently performing.
2648 struct BlacklistCheck *bc;
2654 * Head of DLL of blacklisting clients.
2656 static struct Blacklisters *bl_head;
2659 * Tail of DLL of blacklisting clients.
2661 static struct Blacklisters *bl_tail;
2665 * Context we use when performing a blacklist check.
2667 struct BlacklistCheck
2671 * This is a linked list.
2673 struct BlacklistCheck *next;
2676 * This is a linked list.
2678 struct BlacklistCheck *prev;
2681 * Peer being checked.
2683 struct GNUNET_PeerIdentity peer;
2686 * Option for setup neighbour afterwards.
2691 * Continuation to call with the result.
2693 SetupContinuation cont;
2701 * Current transmission request handle for this client, or NULL if no
2702 * request is pending.
2704 struct GNUNET_CONNECTION_TransmitHandle *th;
2707 * Our current position in the blacklisters list.
2709 struct Blacklisters *bl_pos;
2712 * Current task performing the check.
2714 GNUNET_SCHEDULER_TaskIdentifier task;
2719 * Head of DLL of active blacklisting queries.
2721 static struct BlacklistCheck *bc_head;
2724 * Tail of DLL of active blacklisting queries.
2726 static struct BlacklistCheck *bc_tail;
2730 * Perform next action in the blacklist check.
2732 * @param cls the 'struct BlacklistCheck*'
2736 do_blacklist_check (void *cls,
2737 const struct GNUNET_SCHEDULER_TaskContext *tc);
2741 * Transmit blacklist query to the client.
2743 * @param cls the 'struct BlacklistCheck'
2744 * @param size number of bytes allowed
2745 * @param buf where to copy the message
2746 * @return number of bytes copied to buf
2749 transmit_blacklist_message (void *cls,
2753 struct BlacklistCheck *bc = cls;
2754 struct Blacklisters *bl;
2755 struct BlacklistMessage bm;
2760 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2761 bc->task = GNUNET_SCHEDULER_add_now (sched,
2762 &do_blacklist_check,
2767 bm.header.size = htons (sizeof (struct BlacklistMessage));
2768 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2769 bm.is_allowed = htonl (0);
2771 memcpy (buf, &bm, sizeof (bm));
2772 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2778 * Perform next action in the blacklist check.
2780 * @param cls the 'struct BlacklistCheck*'
2784 do_blacklist_check (void *cls,
2785 const struct GNUNET_SCHEDULER_TaskContext *tc)
2787 struct BlacklistCheck *bc = cls;
2788 struct Blacklisters *bl;
2790 bc->task = GNUNET_SCHEDULER_NO_TASK;
2794 bc->cont (bc->cont_cls,
2795 setup_new_neighbour (&bc->peer, bc->do_hello));
2802 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2803 sizeof (struct BlacklistMessage),
2804 GNUNET_TIME_UNIT_FOREVER_REL,
2805 &transmit_blacklist_message,
2812 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2813 * does not yet exist, check the blacklist. If the blacklist says creating
2814 * one is acceptable, create one and call the continuation; otherwise
2815 * call the continuation with NULL.
2817 * @param peer peer to setup or look up a struct NeighbourList for
2818 * @param do_hello should we also schedule sending our HELLO to the peer
2819 * if this is a new record
2820 * @param cont function to call with the 'struct NeigbhbourList*'
2821 * @param cont_cls closure for cont
2824 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
2826 SetupContinuation cont,
2829 struct NeighbourList *n;
2830 struct BlacklistCheck *bc;
2832 n = find_neighbour(peer);
2838 if (bl_head == NULL)
2841 setup_new_neighbour (peer, do_hello));
2844 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2845 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2847 bc->do_hello = do_hello;
2849 bc->cont_cls = cont_cls;
2850 bc->bl_pos = bl_head;
2851 bc->task = GNUNET_SCHEDULER_add_now (sched,
2852 &do_blacklist_check,
2858 * Function called with the result of querying a new blacklister about
2859 * it being allowed (or not) to continue to talk to an existing neighbour.
2861 * @param cls the original 'struct NeighbourList'
2862 * @param n NULL if we need to disconnect
2865 confirm_or_drop_neighbour (void *cls,
2866 struct NeighbourList *n)
2868 struct NeighbourList * orig = cls;
2871 disconnect_neighbour (orig, GNUNET_NO);
2876 * Handle a request to start a blacklist.
2878 * @param cls closure (always NULL)
2879 * @param client identification of the client
2880 * @param message the actual message
2883 handle_blacklist_init (void *cls,
2884 struct GNUNET_SERVER_Client *client,
2885 const struct GNUNET_MessageHeader *message)
2887 struct Blacklisters *bl;
2888 struct BlacklistCheck *bc;
2889 struct NeighbourList *n;
2894 if (bl->client == client)
2897 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2902 bl = GNUNET_malloc (sizeof (struct Blacklisters));
2903 bl->client = client;
2904 GNUNET_SERVER_client_keep (client);
2905 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
2906 /* confirm that all existing connections are OK! */
2910 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2911 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2913 bc->do_hello = GNUNET_NO;
2914 bc->cont = &confirm_or_drop_neighbour;
2917 if (n == neighbours) /* all would wait for the same client, no need to
2918 create more than just the first task right now */
2919 bc->task = GNUNET_SCHEDULER_add_now (sched,
2920 &do_blacklist_check,
2928 * Handle a request to blacklist a peer.
2930 * @param cls closure (always NULL)
2931 * @param client identification of the client
2932 * @param message the actual message
2935 handle_blacklist_reply (void *cls,
2936 struct GNUNET_SERVER_Client *client,
2937 const struct GNUNET_MessageHeader *message)
2939 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
2940 struct Blacklisters *bl;
2941 struct BlacklistCheck *bc;
2944 while ( (bl != NULL) &&
2945 (bl->client != client) )
2949 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2954 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
2956 bc->cont (bc->cont_cls, NULL);
2957 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
2962 bc->bl_pos = bc->bl_pos->next;
2963 bc->task = GNUNET_SCHEDULER_add_now (sched,
2964 &do_blacklist_check,
2967 /* check if any other bc's are waiting for this blacklister */
2971 if ( (bc->bl_pos == bl) &&
2972 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
2973 bc->task = GNUNET_SCHEDULER_add_now (sched,
2974 &do_blacklist_check,
2982 * Send periodic PING messages to a give foreign address.
2984 * @param cls our 'struct PeriodicValidationContext*'
2985 * @param tc task context
2988 send_periodic_ping (void *cls,
2989 const struct GNUNET_SCHEDULER_TaskContext *tc)
2991 struct ForeignAddressList *peer_address = cls;
2992 struct TransportPlugin *tp;
2993 struct ValidationEntry *va;
2994 struct NeighbourList *neighbour;
2995 struct TransportPingMessage ping;
2996 struct CheckAddressExistsClosure caec;
2998 uint16_t hello_size;
3001 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3002 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3004 tp = peer_address->ready_list->plugin;
3005 neighbour = peer_address->ready_list->neighbour;
3006 if (GNUNET_YES != neighbour->public_key_valid)
3008 /* no public key yet, try again later */
3009 schedule_next_ping (peer_address);
3012 caec.addr = peer_address->addr;
3013 caec.addrlen = peer_address->addrlen;
3014 caec.tname = tp->short_name;
3015 caec.session = peer_address->session;
3016 caec.exists = GNUNET_NO;
3017 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3018 &check_address_exists,
3020 if (caec.exists == GNUNET_YES)
3022 /* During validation attempts we will likely trigger the other
3023 peer trying to validate our address which in turn will cause
3024 it to send us its HELLO, so we expect to hit this case rather
3025 frequently. Only print something if we are very verbose. */
3026 #if DEBUG_TRANSPORT > 1
3027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3028 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3029 (peer_address->addr != NULL)
3030 ? a2s (tp->short_name,
3032 peer_address->addrlen)
3035 GNUNET_i2s (&neighbour->id));
3037 schedule_next_ping (peer_address);
3040 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3041 va->transport_name = GNUNET_strdup (tp->short_name);
3042 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3044 va->send_time = GNUNET_TIME_absolute_get();
3045 va->session = peer_address->session;
3046 if (peer_address->addr != NULL)
3048 va->addr = (const void*) &va[1];
3049 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3050 va->addrlen = peer_address->addrlen;
3052 memcpy(&va->publicKey,
3053 &neighbour->publicKey,
3054 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3056 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3057 HELLO_VERIFICATION_TIMEOUT,
3058 &timeout_hello_validation,
3060 GNUNET_CONTAINER_multihashmap_put (validation_map,
3061 &neighbour->id.hashPubKey,
3063 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3064 hello_size = GNUNET_HELLO_size(our_hello);
3065 tsize = sizeof(struct TransportPingMessage) + hello_size;
3066 message_buf = GNUNET_malloc(tsize);
3067 ping.challenge = htonl(va->challenge);
3068 ping.header.size = htons(sizeof(struct TransportPingMessage));
3069 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3070 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3071 memcpy(message_buf, our_hello, hello_size);
3072 memcpy(&message_buf[hello_size],
3074 sizeof(struct TransportPingMessage));
3075 #if DEBUG_TRANSPORT_REVALIDATION
3076 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3077 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3078 (peer_address->addr != NULL)
3079 ? a2s (peer_address->plugin->short_name,
3081 peer_address->addrlen)
3084 GNUNET_i2s (&neighbour->id),
3085 "HELLO", hello_size,
3086 "PING", sizeof (struct TransportPingMessage));
3088 GNUNET_STATISTICS_update (stats,
3089 gettext_noop ("# PING messages sent for re-validation"),
3092 transmit_to_peer (NULL, peer_address,
3093 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3094 HELLO_VERIFICATION_TIMEOUT,
3096 GNUNET_YES, neighbour);
3097 GNUNET_free(message_buf);
3098 schedule_next_ping (peer_address);
3103 * Schedule the job that will cause us to send a PING to the
3104 * foreign address to evaluate its validity and latency.
3106 * @param fal address to PING
3109 schedule_next_ping (struct ForeignAddressList *fal)
3111 struct GNUNET_TIME_Relative delay;
3113 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3115 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3116 delay.value /= 2; /* do before expiration */
3117 delay = GNUNET_TIME_relative_min (delay,
3118 LATENCY_EVALUATION_MAX_DELAY);
3119 if (GNUNET_YES != fal->estimated)
3121 delay = GNUNET_TIME_UNIT_ZERO;
3122 fal->estimated = GNUNET_YES;
3124 if (GNUNET_YES == fal->connected)
3126 delay = GNUNET_TIME_relative_min (delay,
3127 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3129 /* FIXME: also adjust delay based on how close the last
3130 observed latency is to the latency of the best alternative */
3131 /* bound how fast we can go */
3132 delay = GNUNET_TIME_relative_max (delay,
3133 GNUNET_TIME_UNIT_SECONDS);
3134 /* randomize a bit (to avoid doing all at the same time) */
3135 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3136 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3138 &send_periodic_ping,
3146 * Function that will be called if we receive some payload
3147 * from another peer.
3149 * @param message the payload
3150 * @param n peer who claimed to be the sender
3153 handle_payload_message (const struct GNUNET_MessageHeader *message,
3154 struct NeighbourList *n)
3156 struct InboundMessage *im;
3157 struct TransportClient *cpos;
3160 msize = ntohs (message->size);
3161 if (n->received_pong == GNUNET_NO)
3163 GNUNET_free_non_null (n->pre_connect_message_buffer);
3164 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3165 memcpy (n->pre_connect_message_buffer, message, msize);
3169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3170 "Received message of type %u from `%4s', sending to all clients.\n",
3171 ntohs (message->type),
3172 GNUNET_i2s (&n->id));
3174 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3177 n->quota_violation_count++;
3179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3180 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3181 n->in_tracker.available_bytes_per_s__,
3182 n->quota_violation_count);
3184 /* Discount 32k per violation */
3185 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3190 if (n->quota_violation_count > 0)
3192 /* try to add 32k back */
3193 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3195 n->quota_violation_count--;
3198 GNUNET_STATISTICS_update (stats,
3199 gettext_noop ("# payload received from other peers"),
3202 /* transmit message to all clients */
3203 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3204 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3205 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3206 im->latency = GNUNET_TIME_relative_hton (n->latency);
3208 im->distance = ntohl(n->distance);
3209 memcpy (&im[1], message, msize);
3211 while (cpos != NULL)
3213 transmit_to_client (cpos, &im->header, GNUNET_YES);
3221 * Iterator over hash map entries. Checks if the given validation
3222 * entry is for the same challenge as what is given in the PONG.
3224 * @param cls the 'struct TransportPongMessage*'
3225 * @param key peer identity
3226 * @param value value in the hash map ('struct ValidationEntry')
3227 * @return GNUNET_YES if we should continue to
3228 * iterate (mismatch), GNUNET_NO if not (entry matched)
3231 check_pending_validation (void *cls,
3232 const GNUNET_HashCode * key,
3235 const struct TransportPongMessage *pong = cls;
3236 struct ValidationEntry *ve = value;
3237 struct AddValidatedAddressContext avac;
3238 unsigned int challenge = ntohl(pong->challenge);
3239 struct GNUNET_HELLO_Message *hello;
3240 struct GNUNET_PeerIdentity target;
3241 struct NeighbourList *n;
3242 struct ForeignAddressList *fal;
3243 struct GNUNET_MessageHeader *prem;
3245 if (ve->challenge != challenge)
3250 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING,
3255 GNUNET_break_op (0);
3261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3262 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3265 ? a2s (ve->transport_name,
3266 (const struct sockaddr *) ve->addr,
3269 ve->transport_name);
3271 GNUNET_STATISTICS_update (stats,
3272 gettext_noop ("# address validation successes"),
3275 /* create the updated HELLO */
3276 GNUNET_CRYPTO_hash (&ve->publicKey,
3277 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3278 &target.hashPubKey);
3279 if (ve->addr != NULL)
3281 avac.done = GNUNET_NO;
3283 hello = GNUNET_HELLO_create (&ve->publicKey,
3284 &add_validated_address,
3286 GNUNET_PEERINFO_add_peer (peerinfo,
3288 GNUNET_free (hello);
3290 n = find_neighbour (&target);
3293 n->publicKey = ve->publicKey;
3294 n->public_key_valid = GNUNET_YES;
3295 fal = add_peer_address (n,
3300 GNUNET_assert (fal != NULL);
3301 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3302 fal->validated = GNUNET_YES;
3303 mark_address_connected (fal);
3304 GNUNET_STATISTICS_update (stats,
3305 gettext_noop ("# peer addresses considered valid"),
3308 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3309 schedule_next_ping (fal);
3310 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
3311 n->latency = fal->latency;
3313 n->latency.value = (fal->latency.value + n->latency.value) / 2;
3315 n->distance = fal->distance;
3316 if (GNUNET_NO == n->received_pong)
3318 n->received_pong = GNUNET_YES;
3319 notify_clients_connect (&target, n->latency, n->distance);
3320 if (NULL != (prem = n->pre_connect_message_buffer))
3322 n->pre_connect_message_buffer = NULL;
3323 handle_payload_message (prem, n);
3327 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3329 GNUNET_SCHEDULER_cancel (sched,
3331 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3332 try_transmission_to_peer (n);
3336 /* clean up validation entry */
3337 GNUNET_assert (GNUNET_YES ==
3338 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3341 GNUNET_SCHEDULER_cancel (sched,
3343 GNUNET_free (ve->transport_name);
3350 * Function that will be called if we receive a validation
3351 * of an address challenge that we transmitted to another
3352 * peer. Note that the validation should only be considered
3353 * acceptable if the challenge matches AND if the sender
3354 * address is at least a plausible address for this peer
3355 * (otherwise we may be seeing a MiM attack).
3357 * @param cls closure
3358 * @param message the pong message
3359 * @param peer who responded to our challenge
3360 * @param sender_address string describing our sender address (as observed
3361 * by the other peer in binary format)
3362 * @param sender_address_len number of bytes in 'sender_address'
3365 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3366 const struct GNUNET_PeerIdentity *peer,
3367 const char *sender_address,
3368 size_t sender_address_len)
3370 #if DEBUG_TRANSPORT > 1
3371 /* we get tons of these that just get discarded, only log
3372 if we are quite verbose */
3373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3374 "Receiving `%s' message from `%4s'.\n", "PONG",
3377 GNUNET_STATISTICS_update (stats,
3378 gettext_noop ("# PONG messages received"),
3381 if (GNUNET_SYSERR !=
3382 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3384 &check_pending_validation,
3387 /* This is *expected* to happen a lot since we send
3388 PONGs to *all* known addresses of the sender of
3389 the PING, so most likely we get multiple PONGs
3390 per PING, and all but the first PONG will end up
3391 here. So really we should not print anything here
3392 unless we want to be very, very verbose... */
3393 #if DEBUG_TRANSPORT > 2
3394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3395 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3407 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3409 * @param cls the 'struct ValidationEntry*'
3410 * @param neighbour neighbour to validate, NULL if validation failed
3413 transmit_hello_and_ping (void *cls,
3414 struct NeighbourList *neighbour)
3416 struct ValidationEntry *va = cls;
3417 struct ForeignAddressList *peer_address;
3418 struct TransportPingMessage ping;
3419 uint16_t hello_size;
3423 if (neighbour == NULL)
3425 /* FIXME: stats... */
3426 GNUNET_free (va->transport_name);
3430 neighbour->publicKey = va->publicKey;
3431 neighbour->public_key_valid = GNUNET_YES;
3432 peer_address = add_peer_address (neighbour,
3433 va->transport_name, NULL,
3434 (const void*) &va[1],
3436 if (peer_address == NULL)
3438 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3439 "Failed to add peer `%4s' for plugin `%s'\n",
3440 GNUNET_i2s (&neighbour->id),
3441 va->transport_name);
3442 GNUNET_free (va->transport_name);
3446 hello_size = GNUNET_HELLO_size(our_hello);
3447 tsize = sizeof(struct TransportPingMessage) + hello_size;
3448 message_buf = GNUNET_malloc(tsize);
3449 ping.challenge = htonl(va->challenge);
3450 ping.header.size = htons(sizeof(struct TransportPingMessage));
3451 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3452 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3453 memcpy(message_buf, our_hello, hello_size);
3454 memcpy(&message_buf[hello_size],
3456 sizeof(struct TransportPingMessage));
3458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3459 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3460 a2s (va->transport_name,
3461 (const void*) &va[1], va->addrlen),
3463 GNUNET_i2s (&neighbour->id),
3464 "HELLO", hello_size,
3465 "PING", sizeof (struct TransportPingMessage));
3467 GNUNET_STATISTICS_update (stats,
3468 gettext_noop ("# PING messages sent for initial validation"),
3471 transmit_to_peer (NULL, peer_address,
3472 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3473 HELLO_VERIFICATION_TIMEOUT,
3475 GNUNET_YES, neighbour);
3476 GNUNET_free(message_buf);
3481 * Check if the given address is already being validated; if not,
3482 * append the given address to the list of entries that are being be
3483 * validated and initiate validation.
3485 * @param cls closure ('struct CheckHelloValidatedContext *')
3486 * @param tname name of the transport
3487 * @param expiration expiration time
3488 * @param addr the address
3489 * @param addrlen length of the address
3490 * @return GNUNET_OK (always)
3493 run_validation (void *cls,
3495 struct GNUNET_TIME_Absolute expiration,
3499 struct CheckHelloValidatedContext *chvc = cls;
3500 struct GNUNET_PeerIdentity id;
3501 struct TransportPlugin *tp;
3502 struct ValidationEntry *va;
3503 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3504 struct CheckAddressExistsClosure caec;
3505 struct OwnAddressList *oal;
3507 GNUNET_assert (addr != NULL);
3508 GNUNET_STATISTICS_update (stats,
3509 gettext_noop ("# peer addresses scheduled for validation"),
3512 tp = find_transport (tname);
3515 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3516 GNUNET_ERROR_TYPE_BULK,
3518 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3520 GNUNET_STATISTICS_update (stats,
3521 gettext_noop ("# peer addresses not validated (plugin not available)"),
3526 /* check if this is one of our own addresses */
3527 oal = tp->addresses;
3530 if ( (oal->addrlen == addrlen) &&
3531 (0 == memcmp (oal->addr,
3535 /* not plausible, this address is equivalent to our own address! */
3536 GNUNET_STATISTICS_update (stats,
3537 gettext_noop ("# peer addresses not validated (loopback)"),
3544 GNUNET_HELLO_get_key (chvc->hello, &pk);
3545 GNUNET_CRYPTO_hash (&pk,
3547 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3550 if (is_blacklisted(&id, tp))
3553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3554 _("Attempted to validate blacklisted peer `%s' using `%s'!\n"), GNUNET_i2s(&id), tname);
3560 caec.addrlen = addrlen;
3561 caec.session = NULL;
3563 caec.exists = GNUNET_NO;
3564 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3565 &check_address_exists,
3567 if (caec.exists == GNUNET_YES)
3569 /* During validation attempts we will likely trigger the other
3570 peer trying to validate our address which in turn will cause
3571 it to send us its HELLO, so we expect to hit this case rather
3572 frequently. Only print something if we are very verbose. */
3573 #if DEBUG_TRANSPORT > 1
3574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3575 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3576 a2s (tname, addr, addrlen),
3580 GNUNET_STATISTICS_update (stats,
3581 gettext_noop ("# peer addresses not validated (in progress)"),
3586 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3587 va->transport_name = GNUNET_strdup (tname);
3588 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3590 va->send_time = GNUNET_TIME_absolute_get();
3591 va->addr = (const void*) &va[1];
3592 memcpy (&va[1], addr, addrlen);
3593 va->addrlen = addrlen;
3594 GNUNET_HELLO_get_key (chvc->hello,
3596 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3597 HELLO_VERIFICATION_TIMEOUT,
3598 &timeout_hello_validation,
3600 GNUNET_CONTAINER_multihashmap_put (validation_map,
3603 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3604 setup_peer_check_blacklist (&id, GNUNET_NO,
3605 &transmit_hello_and_ping,
3612 * Check if addresses in validated hello "h" overlap with
3613 * those in "chvc->hello" and validate the rest.
3615 * @param cls closure
3616 * @param peer id of the peer, NULL for last call
3617 * @param h hello message for the peer (can be NULL)
3618 * @param trust amount of trust we have in the peer (not used)
3621 check_hello_validated (void *cls,
3622 const struct GNUNET_PeerIdentity *peer,
3623 const struct GNUNET_HELLO_Message *h,
3626 struct CheckHelloValidatedContext *chvc = cls;
3627 struct GNUNET_HELLO_Message *plain_hello;
3628 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3629 struct GNUNET_PeerIdentity target;
3630 struct NeighbourList *n;
3635 GNUNET_CONTAINER_DLL_remove (chvc_head,
3638 if (GNUNET_NO == chvc->hello_known)
3640 /* notify PEERINFO about the peer now, so that we at least
3641 have the public key if some other component needs it */
3642 GNUNET_HELLO_get_key (chvc->hello, &pk);
3643 GNUNET_CRYPTO_hash (&pk,
3644 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3645 &target.hashPubKey);
3646 plain_hello = GNUNET_HELLO_create (&pk,
3649 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
3650 GNUNET_free (plain_hello);
3652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3653 "Peerinfo had no `%s' message for peer `%4s', full validation needed.\n",
3655 GNUNET_i2s (&target));
3657 GNUNET_STATISTICS_update (stats,
3658 gettext_noop ("# new HELLOs requiring full validation"),
3661 GNUNET_HELLO_iterate_addresses (chvc->hello,
3668 GNUNET_STATISTICS_update (stats,
3669 gettext_noop ("# duplicate HELLO (peer known)"),
3679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3680 "Peerinfo had `%s' message for peer `%4s', validating only new addresses.\n",
3684 chvc->hello_known = GNUNET_YES;
3685 n = find_neighbour (peer);
3688 GNUNET_HELLO_iterate_addresses (h,
3690 &add_to_foreign_address_list,
3692 try_transmission_to_peer (n);
3696 GNUNET_STATISTICS_update (stats,
3697 gettext_noop ("# no existing neighbour record (validating HELLO)"),
3701 GNUNET_STATISTICS_update (stats,
3702 gettext_noop ("# HELLO validations (update case)"),
3705 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
3707 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
3714 * Process HELLO-message.
3716 * @param plugin transport involved, may be NULL
3717 * @param message the actual message
3718 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
3721 process_hello (struct TransportPlugin *plugin,
3722 const struct GNUNET_MessageHeader *message)
3725 struct GNUNET_PeerIdentity target;
3726 const struct GNUNET_HELLO_Message *hello;
3727 struct CheckHelloValidatedContext *chvc;
3728 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
3730 hsize = ntohs (message->size);
3731 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
3732 (hsize < sizeof (struct GNUNET_MessageHeader)))
3735 return GNUNET_SYSERR;
3737 GNUNET_STATISTICS_update (stats,
3738 gettext_noop ("# HELLOs received for validation"),
3741 /* first, check if load is too high */
3742 if (GNUNET_SCHEDULER_get_load (sched,
3743 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
3745 GNUNET_STATISTICS_update (stats,
3746 gettext_noop ("# HELLOs ignored due to high load"),
3751 hello = (const struct GNUNET_HELLO_Message *) message;
3752 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
3754 GNUNET_break_op (0);
3755 return GNUNET_SYSERR;
3757 GNUNET_CRYPTO_hash (&publicKey,
3758 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3759 &target.hashPubKey);
3760 if (0 == memcmp (&my_identity,
3762 sizeof (struct GNUNET_PeerIdentity)))
3764 GNUNET_STATISTICS_update (stats,
3765 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
3770 #if DEBUG_TRANSPORT > 1
3771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3772 "Processing `%s' message for `%4s' of size %u\n",
3774 GNUNET_i2s (&target),
3775 GNUNET_HELLO_size(hello));
3777 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
3778 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
3779 memcpy (&chvc[1], hello, hsize);
3780 GNUNET_CONTAINER_DLL_insert (chvc_head,
3783 /* finally, check if HELLO was previously validated
3784 (continuation will then schedule actual validation) */
3785 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
3788 HELLO_VERIFICATION_TIMEOUT,
3789 &check_hello_validated, chvc);
3795 * The peer specified by the given neighbour has timed-out or a plugin
3796 * has disconnected. We may either need to do nothing (other plugins
3797 * still up), or trigger a full disconnect and clean up. This
3798 * function updates our state and does the necessary notifications.
3799 * Also notifies our clients that the neighbour is now officially
3802 * @param n the neighbour list entry for the peer
3803 * @param check should we just check if all plugins
3804 * disconnected or must we ask all plugins to
3808 disconnect_neighbour (struct NeighbourList *n, int check)
3810 struct ReadyList *rpos;
3811 struct NeighbourList *npos;
3812 struct NeighbourList *nprev;
3813 struct MessageQueue *mq;
3814 struct ForeignAddressList *peer_addresses;
3815 struct ForeignAddressList *peer_pos;
3817 if (GNUNET_YES == check)
3820 while (NULL != rpos)
3822 peer_addresses = rpos->addresses;
3823 while (peer_addresses != NULL)
3825 if (GNUNET_YES == peer_addresses->connected)
3826 return; /* still connected */
3827 peer_addresses = peer_addresses->next;
3833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3834 "Disconnecting from `%4s'\n",
3835 GNUNET_i2s (&n->id));
3837 /* remove n from neighbours list */
3840 while ((npos != NULL) && (npos != n))
3845 GNUNET_assert (npos != NULL);
3847 neighbours = n->next;
3849 nprev->next = n->next;
3851 /* notify all clients about disconnect */
3852 if (GNUNET_YES == n->received_pong)
3853 notify_clients_disconnect (&n->id);
3855 /* clean up all plugins, cancel connections and pending transmissions */
3856 while (NULL != (rpos = n->plugins))
3858 n->plugins = rpos->next;
3859 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
3860 while (rpos->addresses != NULL)
3862 peer_pos = rpos->addresses;
3863 rpos->addresses = peer_pos->next;
3864 if (peer_pos->connected == GNUNET_YES)
3865 GNUNET_STATISTICS_update (stats,
3866 gettext_noop ("# connected addresses"),
3869 if (GNUNET_YES == peer_pos->validated)
3870 GNUNET_STATISTICS_update (stats,
3871 gettext_noop ("# peer addresses considered valid"),
3874 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
3876 GNUNET_SCHEDULER_cancel (sched,
3877 peer_pos->revalidate_task);
3878 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3880 GNUNET_free(peer_pos);
3885 /* free all messages on the queue */
3886 while (NULL != (mq = n->messages_head))
3888 GNUNET_STATISTICS_update (stats,
3889 gettext_noop ("# bytes in message queue for other peers"),
3890 - (int64_t) mq->message_buf_size,
3892 GNUNET_STATISTICS_update (stats,
3893 gettext_noop ("# bytes discarded due to disconnect"),
3894 mq->message_buf_size,
3896 GNUNET_CONTAINER_DLL_remove (n->messages_head,
3899 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
3901 sizeof(struct GNUNET_PeerIdentity)));
3904 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
3906 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
3907 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
3909 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3911 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
3912 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3914 if (n->piter != NULL)
3916 GNUNET_PEERINFO_iterate_cancel (n->piter);
3919 /* finally, free n itself */
3920 GNUNET_STATISTICS_update (stats,
3921 gettext_noop ("# active neighbours"),
3924 GNUNET_free_non_null (n->pre_connect_message_buffer);
3930 * We have received a PING message from someone. Need to send a PONG message
3931 * in response to the peer by any means necessary.
3934 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
3935 const struct GNUNET_PeerIdentity *peer,
3936 const char *sender_address,
3937 uint16_t sender_address_len)
3939 struct TransportPlugin *plugin = cls;
3940 struct TransportPingMessage *ping;
3941 struct TransportPongMessage *pong;
3942 struct NeighbourList *n;
3943 struct ReadyList *rl;
3944 struct ForeignAddressList *fal;
3946 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
3948 GNUNET_break_op (0);
3949 return GNUNET_SYSERR;
3952 ping = (struct TransportPingMessage *) message;
3953 if (0 != memcmp (&ping->target,
3954 plugin->env.my_identity,
3955 sizeof (struct GNUNET_PeerIdentity)))
3957 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3958 _("Received `%s' message not destined for me!\n"),
3960 return GNUNET_SYSERR;
3963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3964 "Processing `%s' from `%s'\n",
3966 (sender_address != NULL)
3967 ? a2s (plugin->short_name,
3968 (const struct sockaddr *)sender_address,
3972 GNUNET_STATISTICS_update (stats,
3973 gettext_noop ("# PING messages received"),
3976 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
3977 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
3978 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
3979 pong->purpose.size =
3980 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3982 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
3983 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING);
3984 pong->challenge = ping->challenge;
3985 pong->addrlen = htons(sender_address_len);
3986 memcpy(&pong->signer,
3988 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3989 if (sender_address != NULL)
3990 memcpy (&pong[1], sender_address, sender_address_len);
3992 GNUNET_assert (GNUNET_OK ==
3993 GNUNET_CRYPTO_rsa_sign (my_private_key,
3994 &pong->purpose, &pong->signature));
3996 n = find_neighbour(peer);
3997 GNUNET_assert (n != NULL);
3998 /* first try reliable response transmission */
4002 fal = rl->addresses;
4005 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4008 ntohs (pong->header.size),
4009 TRANSPORT_PONG_PRIORITY,
4010 HELLO_VERIFICATION_TIMEOUT,
4018 GNUNET_STATISTICS_update (stats,
4019 gettext_noop ("# PONGs unicast via reliable transport"),
4029 /* no reliable method found, do multicast */
4030 GNUNET_STATISTICS_update (stats,
4031 gettext_noop ("# PONGs multicast to all available addresses"),
4037 fal = rl->addresses;
4040 transmit_to_peer(NULL, fal,
4041 TRANSPORT_PONG_PRIORITY,
4042 HELLO_VERIFICATION_TIMEOUT,
4044 ntohs(pong->header.size),
4057 * Function called by the plugin for each received message.
4058 * Update data volumes, possibly notify plugins about
4059 * reducing the rate at which they read from the socket
4060 * and generally forward to our receive callback.
4062 * @param cls the "struct TransportPlugin *" we gave to the plugin
4063 * @param peer (claimed) identity of the other peer
4064 * @param message the message, NULL if we only care about
4065 * learning about the delay until we should receive again
4066 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4067 * @param session identifier used for this session (can be NULL)
4068 * @param sender_address binary address of the sender (if observed)
4069 * @param sender_address_len number of bytes in sender_address
4070 * @return how long the plugin should wait until receiving more data
4071 * (plugins that do not support this, can ignore the return value)
4073 static struct GNUNET_TIME_Relative
4074 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4075 const struct GNUNET_MessageHeader *message,
4077 struct Session *session,
4078 const char *sender_address,
4079 uint16_t sender_address_len)
4081 struct TransportPlugin *plugin = cls;
4082 struct ReadyList *service_context;
4083 struct ForeignAddressList *peer_address;
4085 struct NeighbourList *n;
4086 struct GNUNET_TIME_Relative ret;
4088 if (is_blacklisted (peer, plugin))
4089 return GNUNET_TIME_UNIT_FOREVER_REL;
4091 n = find_neighbour (peer);
4093 n = setup_new_neighbour (peer, GNUNET_YES);
4094 service_context = n->plugins;
4095 while ((service_context != NULL) && (plugin != service_context->plugin))
4096 service_context = service_context->next;
4097 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4098 peer_address = NULL;
4099 if (message != NULL)
4101 if ( (session != NULL) ||
4102 (sender_address != NULL) )
4103 peer_address = add_peer_address (n,
4107 sender_address_len);
4108 if (peer_address != NULL)
4110 peer_address->distance = distance;
4111 if (GNUNET_YES == peer_address->validated)
4112 mark_address_connected (peer_address);
4113 peer_address->timeout
4115 GNUNET_TIME_relative_to_absolute
4116 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4117 schedule_next_ping (peer_address);
4119 /* update traffic received amount ... */
4120 msize = ntohs (message->size);
4121 GNUNET_STATISTICS_update (stats,
4122 gettext_noop ("# bytes received from other peers"),
4125 n->distance = distance;
4127 GNUNET_TIME_relative_to_absolute
4128 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4129 GNUNET_SCHEDULER_cancel (sched,
4132 GNUNET_SCHEDULER_add_delayed (sched,
4133 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4134 &neighbour_timeout_task, n);
4135 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4137 /* dropping message due to frequent inbound volume violations! */
4138 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4139 GNUNET_ERROR_TYPE_BULK,
4141 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4142 n->in_tracker.available_bytes_per_s__,
4143 n->quota_violation_count);
4144 GNUNET_STATISTICS_update (stats,
4145 gettext_noop ("# bandwidth quota violations by other peers"),
4148 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4152 "Received message of type %u from `%4s', sending to all clients.\n",
4153 ntohs (message->type), GNUNET_i2s (peer));
4155 switch (ntohs (message->type))
4157 case GNUNET_MESSAGE_TYPE_HELLO:
4158 GNUNET_STATISTICS_update (stats,
4159 gettext_noop ("# HELLO messages received from other peers"),
4162 process_hello (plugin, message);
4164 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4165 handle_ping (plugin, message, peer, sender_address, sender_address_len);
4167 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4168 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4171 handle_payload_message (message, n);
4175 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4178 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4179 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4180 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4181 (unsigned int) n->in_tracker.available_bytes_per_s__,
4182 (unsigned long long) ret.value);
4183 GNUNET_STATISTICS_update (stats,
4184 gettext_noop ("# ms throttling suggested"),
4185 (int64_t) ret.value,
4192 * Handle START-message. This is the first message sent to us
4193 * by any client which causes us to add it to our list.
4195 * @param cls closure (always NULL)
4196 * @param client identification of the client
4197 * @param message the actual message
4200 handle_start (void *cls,
4201 struct GNUNET_SERVER_Client *client,
4202 const struct GNUNET_MessageHeader *message)
4204 struct TransportClient *c;
4205 struct ConnectInfoMessage cim;
4206 struct NeighbourList *n;
4209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4210 "Received `%s' request from client\n", "START");
4215 if (c->client == client)
4217 /* client already on our list! */
4219 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4224 c = GNUNET_malloc (sizeof (struct TransportClient));
4228 if (our_hello != NULL)
4231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4232 "Sending our own `%s' to new client\n", "HELLO");
4234 transmit_to_client (c,
4235 (const struct GNUNET_MessageHeader *) our_hello,
4237 /* tell new client about all existing connections */
4238 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4239 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4243 if (GNUNET_YES == n->received_pong)
4246 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4247 cim.distance = htonl (n->distance);
4248 transmit_to_client (c, &cim.header, GNUNET_NO);
4253 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4258 * Handle HELLO-message.
4260 * @param cls closure (always NULL)
4261 * @param client identification of the client
4262 * @param message the actual message
4265 handle_hello (void *cls,
4266 struct GNUNET_SERVER_Client *client,
4267 const struct GNUNET_MessageHeader *message)
4271 GNUNET_STATISTICS_update (stats,
4272 gettext_noop ("# HELLOs received from clients"),
4275 ret = process_hello (NULL, message);
4276 GNUNET_SERVER_receive_done (client, ret);
4281 * Closure for 'transmit_client_message'; followed by
4282 * 'msize' bytes of the actual message.
4284 struct TransmitClientMessageContext
4287 * Client on whom's behalf we are sending.
4289 struct GNUNET_SERVER_Client *client;
4292 * Timeout for the transmission.
4294 struct GNUNET_TIME_Absolute timeout;
4302 * Size of the message in bytes.
4309 * Schedule transmission of a message we got from a client to a peer.
4311 * @param cls the 'struct TransmitClientMessageContext*'
4312 * @param n destination, or NULL on error (in that case, drop the message)
4315 transmit_client_message (void *cls,
4316 struct NeighbourList *n)
4318 struct TransmitClientMessageContext *tcmc = cls;
4319 struct TransportClient *tc;
4322 while ((tc != NULL) && (tc->client != tcmc->client))
4327 transmit_to_peer (tc, NULL, tcmc->priority,
4328 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4330 tcmc->msize, GNUNET_NO, n);
4332 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4333 GNUNET_SERVER_client_drop (tcmc->client);
4339 * Handle SEND-message.
4341 * @param cls closure (always NULL)
4342 * @param client identification of the client
4343 * @param message the actual message
4346 handle_send (void *cls,
4347 struct GNUNET_SERVER_Client *client,
4348 const struct GNUNET_MessageHeader *message)
4350 const struct OutboundMessage *obm;
4351 const struct GNUNET_MessageHeader *obmm;
4352 struct TransmitClientMessageContext *tcmc;
4356 size = ntohs (message->size);
4358 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4361 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4364 GNUNET_STATISTICS_update (stats,
4365 gettext_noop ("# payload received for other peers"),
4368 obm = (const struct OutboundMessage *) message;
4369 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4370 msize = ntohs (obmm->size);
4372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4373 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4374 "SEND", GNUNET_i2s (&obm->peer),
4378 if (size != msize + sizeof (struct OutboundMessage))
4381 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4384 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4385 tcmc->client = client;
4386 tcmc->priority = ntohl (obm->priority);
4387 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4388 tcmc->msize = msize;
4389 memcpy (&tcmc[1], obmm, msize);
4390 GNUNET_SERVER_client_keep (client);
4391 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4392 &transmit_client_message,
4398 * Handle SET_QUOTA-message.
4400 * @param cls closure (always NULL)
4401 * @param client identification of the client
4402 * @param message the actual message
4405 handle_set_quota (void *cls,
4406 struct GNUNET_SERVER_Client *client,
4407 const struct GNUNET_MessageHeader *message)
4409 const struct QuotaSetMessage *qsm =
4410 (const struct QuotaSetMessage *) message;
4411 struct NeighbourList *n;
4413 GNUNET_STATISTICS_update (stats,
4414 gettext_noop ("# SET QUOTA messages received"),
4417 n = find_neighbour (&qsm->peer);
4420 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4421 GNUNET_STATISTICS_update (stats,
4422 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
4428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4429 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
4431 (unsigned int) ntohl (qsm->quota.value__),
4432 (unsigned int) n->in_tracker.available_bytes_per_s__,
4433 GNUNET_i2s (&qsm->peer));
4435 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
4437 if (0 == ntohl (qsm->quota.value__))
4438 disconnect_neighbour (n, GNUNET_NO);
4439 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4444 * Take the given address and append it to the set of results send back to
4447 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
4448 * @param address the resolved name, NULL to indicate the last response
4451 transmit_address_to_client (void *cls, const char *address)
4453 struct GNUNET_SERVER_TransmitContext *tc = cls;
4456 if (NULL == address)
4459 slen = strlen (address) + 1;
4460 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
4461 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4462 if (NULL == address)
4463 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
4468 * Handle AddressLookup-message.
4470 * @param cls closure (always NULL)
4471 * @param client identification of the client
4472 * @param message the actual message
4475 handle_address_lookup (void *cls,
4476 struct GNUNET_SERVER_Client *client,
4477 const struct GNUNET_MessageHeader *message)
4479 const struct AddressLookupMessage *alum;
4480 struct TransportPlugin *lsPlugin;
4481 const char *nameTransport;
4482 const char *address;
4484 struct GNUNET_SERVER_TransmitContext *tc;
4485 struct GNUNET_TIME_Absolute timeout;
4486 struct GNUNET_TIME_Relative rtimeout;
4489 size = ntohs (message->size);
4490 if (size < sizeof (struct AddressLookupMessage))
4492 GNUNET_break_op (0);
4493 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4496 alum = (const struct AddressLookupMessage *) message;
4497 uint32_t addressLen = ntohl (alum->addrlen);
4498 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
4500 GNUNET_break_op (0);
4501 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4504 address = (const char *) &alum[1];
4505 nameTransport = (const char *) &address[addressLen];
4507 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
4509 GNUNET_break_op (0);
4510 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4513 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
4514 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
4515 numeric = ntohl (alum->numeric_only);
4516 lsPlugin = find_transport (nameTransport);
4517 if (NULL == lsPlugin)
4519 tc = GNUNET_SERVER_transmit_context_create (client);
4520 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
4521 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4522 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
4525 tc = GNUNET_SERVER_transmit_context_create (client);
4526 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
4528 address, addressLen,
4531 &transmit_address_to_client, tc);
4535 * List of handlers for the messages understood by this
4538 static struct GNUNET_SERVER_MessageHandler handlers[] = {
4539 {&handle_start, NULL,
4540 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
4541 {&handle_hello, NULL,
4542 GNUNET_MESSAGE_TYPE_HELLO, 0},
4543 {&handle_send, NULL,
4544 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
4545 {&handle_set_quota, NULL,
4546 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
4547 {&handle_address_lookup, NULL,
4548 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
4550 {&handle_blacklist_init, NULL,
4551 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
4552 {&handle_blacklist_reply, NULL,
4553 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
4559 * Setup the environment for this plugin.
4562 create_environment (struct TransportPlugin *plug)
4564 plug->env.cfg = cfg;
4565 plug->env.sched = sched;
4566 plug->env.my_identity = &my_identity;
4567 plug->env.cls = plug;
4568 plug->env.receive = &plugin_env_receive;
4569 plug->env.notify_address = &plugin_env_notify_address;
4570 plug->env.session_end = &plugin_env_session_end;
4571 plug->env.max_connections = max_connect_per_transport;
4572 plug->env.stats = stats;
4577 * Start the specified transport (load the plugin).
4580 start_transport (struct GNUNET_SERVER_Handle *server,
4583 struct TransportPlugin *plug;
4586 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4587 _("Loading `%s' transport plugin\n"), name);
4588 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
4589 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
4590 create_environment (plug);
4591 plug->short_name = GNUNET_strdup (name);
4592 plug->lib_name = libname;
4593 plug->next = plugins;
4595 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
4596 if (plug->api == NULL)
4598 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4599 _("Failed to load transport plugin for `%s'\n"), name);
4600 GNUNET_free (plug->short_name);
4601 plugins = plug->next;
4602 GNUNET_free (libname);
4609 * Called whenever a client is disconnected. Frees our
4610 * resources associated with that client.
4612 * @param cls closure
4613 * @param client identification of the client
4616 client_disconnect_notification (void *cls,
4617 struct GNUNET_SERVER_Client *client)
4619 struct TransportClient *pos;
4620 struct TransportClient *prev;
4621 struct ClientMessageQueueEntry *mqe;
4622 struct Blacklisters *bl;
4623 struct BlacklistCheck *bc;
4628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4629 "Client disconnected, cleaning up.\n");
4631 /* clean up blacklister */
4635 if (bl->client == client)
4640 if (bc->bl_pos == bl)
4642 bc->bl_pos = bl->next;
4645 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
4648 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
4649 bc->task = GNUNET_SCHEDULER_add_now (sched,
4650 &do_blacklist_check,
4656 GNUNET_CONTAINER_DLL_remove (bl_head,
4659 GNUNET_SERVER_client_drop (bl->client);
4665 /* clean up 'normal' clients */
4668 while ((pos != NULL) && (pos->client != client))
4675 while (NULL != (mqe = pos->message_queue_head))
4677 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
4678 pos->message_queue_tail,
4680 pos->message_count--;
4684 clients = pos->next;
4686 prev->next = pos->next;
4687 if (GNUNET_YES == pos->tcs_pending)
4692 if (pos->th != NULL)
4694 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
4697 GNUNET_break (0 == pos->message_count);
4703 * Iterator to free entries in the validation_map.
4705 * @param cls closure (unused)
4706 * @param key current key code
4707 * @param value value in the hash map (validation to abort)
4708 * @return GNUNET_YES (always)
4711 abort_validation (void *cls,
4712 const GNUNET_HashCode * key,
4715 struct ValidationEntry *va = value;
4717 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
4718 GNUNET_free (va->transport_name);
4725 * Function called when the service shuts down. Unloads our plugins
4726 * and cancels pending validations.
4728 * @param cls closure, unused
4729 * @param tc task context (unused)
4732 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4734 struct TransportPlugin *plug;
4735 struct OwnAddressList *al;
4736 struct CheckHelloValidatedContext *chvc;
4738 while (neighbours != NULL)
4739 disconnect_neighbour (neighbours, GNUNET_NO);
4741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4742 "Transport service is unloading plugins...\n");
4744 while (NULL != (plug = plugins))
4746 plugins = plug->next;
4747 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
4749 GNUNET_SCHEDULER_cancel (plug->env.sched,
4750 plug->address_update_task);
4751 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
4753 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
4754 GNUNET_free (plug->lib_name);
4755 GNUNET_free (plug->short_name);
4756 while (NULL != (al = plug->addresses))
4758 plug->addresses = al->next;
4763 if (my_private_key != NULL)
4764 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4765 GNUNET_free_non_null (our_hello);
4767 /* free 'chvc' data structure */
4768 while (NULL != (chvc = chvc_head))
4770 chvc_head = chvc->next;
4771 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
4776 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
4779 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4780 validation_map = NULL;
4783 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4787 /* Can we assume those are gone by now, or do we need to clean up
4789 GNUNET_break (bl_head == NULL);
4790 GNUNET_break (bc_head == NULL);
4795 * Initiate transport service.
4797 * @param cls closure
4798 * @param s scheduler to use
4799 * @param serv the initialized server
4800 * @param c configuration to use
4804 struct GNUNET_SCHEDULER_Handle *s,
4805 struct GNUNET_SERVER_Handle *serv,
4806 const struct GNUNET_CONFIGURATION_Handle *c)
4811 unsigned long long tneigh;
4816 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
4817 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
4818 /* parse configuration */
4820 GNUNET_CONFIGURATION_get_value_number (c,
4825 GNUNET_CONFIGURATION_get_value_filename (c,
4827 "HOSTKEY", &keyfile)))
4829 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4831 ("Transport service is lacking key configuration settings. Exiting.\n"));
4832 GNUNET_SCHEDULER_shutdown (s);
4835 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4838 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4839 validation_map = NULL;
4842 max_connect_per_transport = (uint32_t) tneigh;
4843 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
4844 if (peerinfo == NULL)
4846 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4847 _("Could not access PEERINFO service. Exiting.\n"));
4848 GNUNET_SCHEDULER_shutdown (s);
4851 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4854 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4855 validation_map = NULL;
4856 GNUNET_free (keyfile);
4859 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4860 GNUNET_free (keyfile);
4861 if (my_private_key == NULL)
4863 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4865 ("Transport service could not access hostkey. Exiting.\n"));
4866 GNUNET_SCHEDULER_shutdown (s);
4869 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4872 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4873 validation_map = NULL;
4876 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4877 GNUNET_CRYPTO_hash (&my_public_key,
4878 sizeof (my_public_key), &my_identity.hashPubKey);
4879 /* setup notification */
4881 GNUNET_SERVER_disconnect_notify (server,
4882 &client_disconnect_notification, NULL);
4883 /* load plugins... */
4886 GNUNET_CONFIGURATION_get_value_string (c,
4887 "TRANSPORT", "PLUGINS", &plugs))
4889 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4890 _("Starting transport plugins `%s'\n"), plugs);
4891 pos = strtok (plugs, " ");
4894 start_transport (server, pos);
4896 pos = strtok (NULL, " ");
4898 GNUNET_free (plugs);
4900 GNUNET_SCHEDULER_add_delayed (sched,
4901 GNUNET_TIME_UNIT_FOREVER_REL,
4902 &shutdown_task, NULL);
4907 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
4909 /* If we have a blacklist file, read from it */
4910 read_blacklist_file(cfg);
4911 /* process client requests */
4912 GNUNET_SERVER_add_handlers (server, handlers);
4917 * The main function for the transport service.
4919 * @param argc number of arguments from the command line
4920 * @param argv command line arguments
4921 * @return 0 ok, 1 on error
4924 main (int argc, char *const *argv)
4926 a2s (NULL, NULL, 0); /* make compiler happy */
4927 return (GNUNET_OK ==
4928 GNUNET_SERVICE_run (argc,
4931 GNUNET_SERVICE_OPTION_NONE,
4932 &run, NULL)) ? 0 : 1;
4935 /* end of gnunet-service-transport.c */