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. Note that
62 * this value must be about as large as 'TOTAL_MSGS' in the
63 * 'test_transport_api_reliability.c', otherwise that testcase may
66 #define MAX_PENDING (128 * 1024)
69 * Size of the per-transport blacklist hash maps.
71 #define TRANSPORT_BLACKLIST_HT_SIZE 16
74 * How often should we try to reconnect to a peer using a particular
75 * transport plugin before giving up? Note that the plugin may be
76 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
78 #define MAX_CONNECT_RETRY 3
81 * Limit on the number of ready-to-run tasks when validating
82 * HELLOs. If more tasks are ready to run, we will drop
83 * HELLOs instead of validating them.
85 #define MAX_HELLO_LOAD 4
88 * How often must a peer violate bandwidth quotas before we start
89 * to simply drop its messages?
91 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
94 * How long until a HELLO verification attempt should time out?
95 * Must be rather small, otherwise a partially successful HELLO
96 * validation (some addresses working) might not be available
97 * before a client's request for a connection fails for good.
98 * Besides, if a single request to an address takes a long time,
99 * then the peer is unlikely worthwhile anyway.
101 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
104 * Priority to use for PONG messages.
106 #define TRANSPORT_PONG_PRIORITY 4
109 * How often do we re-add (cheaper) plugins to our list of plugins
110 * to try for a given connected peer?
112 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
115 * After how long do we expire an address in a HELLO that we just
116 * validated? This value is also used for our own addresses when we
119 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
123 * How long before an existing address expires should we again try to
124 * validate it? Must be (significantly) smaller than
125 * HELLO_ADDRESS_EXPIRATION.
127 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
130 * Maximum frequency for re-evaluating latencies for all transport addresses.
132 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
135 * Maximum frequency for re-evaluating latencies for connected addresses.
137 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
141 * List of addresses of other peers
143 struct ForeignAddressList
146 * This is a linked list.
148 struct ForeignAddressList *next;
151 * Which ready list does this entry belong to.
153 struct ReadyList *ready_list;
156 * How long until we auto-expire this address (unless it is
157 * re-confirmed by the transport)?
159 struct GNUNET_TIME_Absolute expires;
162 * Task used to re-validate addresses, updates latencies and
165 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
173 * Session (or NULL if no valid session currently exists or if the
174 * plugin does not use sessions).
176 struct Session *session;
179 * What was the last latency observed for this address, plugin and peer?
181 struct GNUNET_TIME_Relative latency;
184 * If we did not successfully transmit a message to the given peer
185 * via this connection during the specified time, we should consider
186 * the connection to be dead. This is used in the case that a TCP
187 * transport simply stalls writing to the stream but does not
188 * formerly get a signal that the other peer died.
190 struct GNUNET_TIME_Absolute timeout;
193 * How often have we tried to connect using this plugin? Used to
194 * discriminate against addresses that do not work well.
195 * FIXME: not yet used, but should be!
197 unsigned int connect_attempts;
200 * DV distance to this peer (1 if no DV is used).
201 * FIXME: need to set this from transport plugins!
211 * Have we ever estimated the latency of this address? Used to
212 * ensure that the first time we add an address, we immediately
218 * Are we currently connected via this address? The first time we
219 * successfully transmit or receive data to a peer via a particular
220 * address, we set this to GNUNET_YES. If we later get an error
221 * (disconnect notification, transmission failure, timeout), we set
222 * it back to GNUNET_NO.
227 * Is this plugin currently busy transmitting to the specific target?
228 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
229 * messages do not count as 'in transmit'.
234 * Has this address been validated yet?
242 * Entry in linked list of network addresses for ourselves.
244 struct OwnAddressList
247 * This is a linked list.
249 struct OwnAddressList *next;
252 * The address, actually a pointer to the end
253 * of this struct. Do not free!
258 * How long until we auto-expire this address (unless it is
259 * re-confirmed by the transport)?
261 struct GNUNET_TIME_Absolute expires;
272 * Entry in linked list of all of our plugins.
274 struct TransportPlugin
278 * This is a linked list.
280 struct TransportPlugin *next;
283 * API of the transport as returned by the plugin's
284 * initialization function.
286 struct GNUNET_TRANSPORT_PluginFunctions *api;
289 * Short name for the plugin (i.e. "tcp").
294 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
299 * List of our known addresses for this transport.
301 struct OwnAddressList *addresses;
304 * Environment this transport service is using
307 struct GNUNET_TRANSPORT_PluginEnvironment env;
310 * ID of task that is used to clean up expired addresses.
312 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
315 * Set to GNUNET_YES if we need to scrap the existing list of
316 * "addresses" and start fresh when we receive the next address
317 * update from a transport. Set to GNUNET_NO if we should just add
318 * the new address to the list and wait for the commit call.
323 * Hashmap of blacklisted peers for this particular transport.
325 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
328 struct NeighbourList;
331 * For each neighbour we keep a list of messages
332 * that we still want to transmit to the neighbour.
338 * This is a doubly linked list.
340 struct MessageQueue *next;
343 * This is a doubly linked list.
345 struct MessageQueue *prev;
348 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
349 * stuck together in memory. Allocated at the end of this struct.
351 const char *message_buf;
354 * Size of the message buf
356 size_t message_buf_size;
359 * Client responsible for queueing the message;
360 * used to check that a client has no two messages
361 * pending for the same target. Can be NULL.
363 struct TransportClient *client;
366 * Using which specific address should we send this message?
368 struct ForeignAddressList *specific_address;
371 * Peer ID of the Neighbour this entry belongs to.
373 struct GNUNET_PeerIdentity neighbour_id;
376 * Plugin that we used for the transmission.
377 * NULL until we scheduled a transmission.
379 struct TransportPlugin *plugin;
382 * At what time should we fail?
384 struct GNUNET_TIME_Absolute timeout;
387 * Internal message of the transport system that should not be
388 * included in the usual SEND-SEND_OK transmission confirmation
389 * traffic management scheme. Typically, "internal_msg" will
390 * be set whenever "client" is NULL (but it is not strictly
396 * How important is the message?
398 unsigned int priority;
404 * For a given Neighbour, which plugins are available
405 * to talk to this peer and what are their costs?
410 * This is a linked list.
412 struct ReadyList *next;
415 * Which of our transport plugins does this entry
418 struct TransportPlugin *plugin;
421 * Transport addresses, latency, and readiness for
422 * this particular plugin.
424 struct ForeignAddressList *addresses;
427 * To which neighbour does this ready list belong to?
429 struct NeighbourList *neighbour;
435 * Entry in linked list of all of our current neighbours.
441 * This is a linked list.
443 struct NeighbourList *next;
446 * Which of our transports is connected to this peer
447 * and what is their status?
449 struct ReadyList *plugins;
452 * Head of list of messages we would like to send to this peer;
453 * must contain at most one message per client.
455 struct MessageQueue *messages_head;
458 * Tail of list of messages we would like to send to this peer; must
459 * contain at most one message per client.
461 struct MessageQueue *messages_tail;
464 * Buffer for at most one payload message used when we receive
465 * payload data before our PING-PONG has succeeded. We then
466 * store such messages in this intermediary buffer until the
467 * connection is fully up.
469 struct GNUNET_MessageHeader *pre_connect_message_buffer;
472 * Context for peerinfo iteration.
473 * NULL after we are done processing peerinfo's information.
475 struct GNUNET_PEERINFO_IteratorContext *piter;
478 * Public key for this peer. Valid only if the respective flag is set below.
480 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
483 * Identity of this neighbour.
485 struct GNUNET_PeerIdentity id;
488 * ID of task scheduled to run when this peer is about to
489 * time out (will free resources associated with the peer).
491 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
494 * ID of task scheduled to run when we should retry transmitting
495 * the head of the message queue. Actually triggered when the
496 * transmission is timing out (we trigger instantly when we have
497 * a chance of success).
499 GNUNET_SCHEDULER_TaskIdentifier retry_task;
502 * How long until we should consider this peer dead
503 * (if we don't receive another message in the
506 struct GNUNET_TIME_Absolute peer_timeout;
509 * Tracker for inbound bandwidth.
511 struct GNUNET_BANDWIDTH_Tracker in_tracker;
514 * The latency we have seen for this particular address for
515 * this particular peer. This latency may have been calculated
516 * over multiple transports. This value reflects how long it took
517 * us to receive a response when SENDING via this particular
518 * transport/neighbour/address combination!
520 * FIXME: we need to periodically send PINGs to update this
521 * latency (at least more often than the current "huge" (11h?)
524 struct GNUNET_TIME_Relative latency;
527 * How often has the other peer (recently) violated the
528 * inbound traffic limit? Incremented by 10 per violation,
529 * decremented by 1 per non-violation (for each
532 unsigned int quota_violation_count;
535 * DV distance to this peer (1 if no DV is used).
540 * Have we seen an PONG from this neighbour in the past (and
541 * not had a disconnect since)?
546 * Do we have a valid public key for this neighbour?
548 int public_key_valid;
553 * Message used to ask a peer to validate receipt (to check an address
556 struct TransportPingMessage
560 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
562 struct GNUNET_MessageHeader header;
565 * Random challenge number (in network byte order).
567 uint32_t challenge GNUNET_PACKED;
570 * Who is the intended recipient?
572 struct GNUNET_PeerIdentity target;
578 * Message used to validate a HELLO. The challenge is included in the
579 * confirmation to make matching of replies to requests possible. The
580 * signature signs the original challenge number, our public key, the
581 * sender's address (so that the sender can check that the address we
582 * saw is plausible for him and possibly detect a MiM attack) and a
583 * timestamp (to limit replay).<p>
585 * This message is followed by the address of the
586 * client that we are observing (which is part of what
589 struct TransportPongMessage
593 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
595 struct GNUNET_MessageHeader header;
598 * For padding, always zero.
600 uint32_t reserved GNUNET_PACKED;
605 struct GNUNET_CRYPTO_RsaSignature signature;
608 * What are we signing and why?
610 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
613 * Random challenge number (in network byte order).
615 uint32_t challenge GNUNET_PACKED;
618 * Who signed this message?
620 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
623 * Size of address appended to this message
631 * Linked list of messages to be transmitted to the client. Each
632 * entry is followed by the actual message.
634 struct ClientMessageQueueEntry
637 * This is a doubly-linked list.
639 struct ClientMessageQueueEntry *next;
642 * This is a doubly-linked list.
644 struct ClientMessageQueueEntry *prev;
649 * Client connected to the transport service.
651 struct TransportClient
655 * This is a linked list.
657 struct TransportClient *next;
660 * Handle to the client.
662 struct GNUNET_SERVER_Client *client;
665 * Linked list of messages yet to be transmitted to
668 struct ClientMessageQueueEntry *message_queue_head;
671 * Tail of linked list of messages yet to be transmitted to the
674 struct ClientMessageQueueEntry *message_queue_tail;
677 * Current transmit request handle.
679 struct GNUNET_CONNECTION_TransmitHandle *th;
682 * Is a call to "transmit_send_continuation" pending? If so, we
683 * must not free this struct (even if the corresponding client
684 * disconnects) and instead only remove it from the linked list and
685 * set the "client" field to NULL.
690 * Length of the list of messages pending for this client.
692 unsigned int message_count;
698 * Context of currently active requests to peerinfo
699 * for validation of HELLOs.
701 struct CheckHelloValidatedContext;
705 * Entry in map of all HELLOs awaiting validation.
707 struct ValidationEntry
711 * NULL if this entry is not part of a larger HELLO validation.
713 struct CheckHelloValidatedContext *chvc;
716 * The address, actually a pointer to the end
717 * of this struct. Do not free!
722 * Name of the transport.
724 char *transport_name;
727 * The public key of the peer.
729 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
732 * ID of task that will clean up this entry if we don't succeed
733 * with the validation first.
735 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
738 * At what time did we send this validation?
740 struct GNUNET_TIME_Absolute send_time;
743 * Session being validated (or NULL for none).
745 struct Session *session;
748 * Challenge number we used.
761 * Context of currently active requests to peerinfo
762 * for validation of HELLOs.
764 struct CheckHelloValidatedContext
768 * This is a doubly-linked list.
770 struct CheckHelloValidatedContext *next;
773 * This is a doubly-linked list.
775 struct CheckHelloValidatedContext *prev;
778 * Hello that we are validating.
780 const struct GNUNET_HELLO_Message *hello;
783 * Context for peerinfo iteration.
784 * NULL after we are done processing peerinfo's information.
786 struct GNUNET_PEERINFO_IteratorContext *piter;
789 * Was a HELLO known for this peer to peerinfo?
794 * Number of validation entries currently referring to this
797 unsigned int ve_count;
805 static struct GNUNET_HELLO_Message *our_hello;
808 * "version" of "our_hello". Used to see if a given neighbour has
809 * already been sent the latest version of our HELLO message.
811 static unsigned int our_hello_version;
816 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
821 static struct GNUNET_PeerIdentity my_identity;
826 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
831 struct GNUNET_SCHEDULER_Handle *sched;
836 const struct GNUNET_CONFIGURATION_Handle *cfg;
839 * Linked list of all clients to this service.
841 static struct TransportClient *clients;
844 * All loaded plugins.
846 static struct TransportPlugin *plugins;
851 static struct GNUNET_SERVER_Handle *server;
854 * Handle to peerinfo service.
856 static struct GNUNET_PEERINFO_Handle *peerinfo;
859 * All known neighbours and their HELLOs.
861 static struct NeighbourList *neighbours;
864 * Number of neighbours we'd like to have.
866 static uint32_t max_connect_per_transport;
869 * Head of linked list.
871 static struct CheckHelloValidatedContext *chvc_head;
874 * Tail of linked list.
876 static struct CheckHelloValidatedContext *chvc_tail;
879 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
880 * of the given peer that we are currently validating).
882 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
885 * Handle for reporting statistics.
887 static struct GNUNET_STATISTICS_Handle *stats;
891 * The peer specified by the given neighbour has timed-out or a plugin
892 * has disconnected. We may either need to do nothing (other plugins
893 * still up), or trigger a full disconnect and clean up. This
894 * function updates our state and do the necessary notifications.
895 * Also notifies our clients that the neighbour is now officially
898 * @param n the neighbour list entry for the peer
899 * @param check should we just check if all plugins
900 * disconnected or must we ask all plugins to
903 static void disconnect_neighbour (struct NeighbourList *n, int check);
906 * Check the ready list for the given neighbour and if a plugin is
907 * ready for transmission (and if we have a message), do so!
909 * @param neighbour target peer for which to transmit
911 static void try_transmission_to_peer (struct NeighbourList *neighbour);
915 * Find an entry in the neighbour list for a particular peer.
917 * @return NULL if not found.
919 static struct NeighbourList *
920 find_neighbour (const struct GNUNET_PeerIdentity *key)
922 struct NeighbourList *head = neighbours;
924 while ((head != NULL) &&
925 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
932 * Find an entry in the transport list for a particular transport.
934 * @return NULL if not found.
936 static struct TransportPlugin *
937 find_transport (const char *short_name)
939 struct TransportPlugin *head = plugins;
940 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
946 * Is a particular peer blacklisted for a particular transport?
948 * @param peer the peer to check for
949 * @param plugin the plugin used to connect to the peer
951 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
954 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
957 if (plugin->blacklist != NULL)
959 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
963 _("Peer `%s:%s' is blacklisted!\n"),
964 plugin->short_name, GNUNET_i2s (peer));
975 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
977 struct TransportPlugin *plugin;
979 plugin = find_transport(transport_name);
980 if (plugin == NULL) /* Nothing to do */
982 if (plugin->blacklist == NULL)
983 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
984 GNUNET_assert(plugin->blacklist != NULL);
985 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
987 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
992 * Read the blacklist file, containing transport:peer entries.
993 * Provided the transport is loaded, set up hashmap with these
994 * entries to blacklist peers by transport.
998 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1005 struct GNUNET_PeerIdentity pid;
1007 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1008 unsigned int entries_found;
1009 char *transport_name;
1012 GNUNET_CONFIGURATION_get_value_filename (cfg,
1018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1019 _("Option `%s' in section `%s' not specified!\n"),
1025 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1026 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1027 | GNUNET_DISK_PERM_USER_WRITE);
1028 if (0 != STAT (fn, &frstat))
1030 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1031 _("Could not read blacklist file `%s'\n"), fn);
1035 if (frstat.st_size == 0)
1037 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1038 _("Blacklist file `%s' is empty.\n"),
1043 /* FIXME: use mmap */
1044 data = GNUNET_malloc_large (frstat.st_size);
1045 if (frstat.st_size !=
1046 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1048 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1049 _("Failed to read blacklist from `%s'\n"), fn);
1056 while ((pos < frstat.st_size) && isspace (data[pos]))
1058 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1059 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1062 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace (data[colon_pos]))
1065 if (colon_pos >= frstat.st_size)
1067 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1068 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1069 (unsigned long long) colon_pos);
1075 if (isspace(data[colon_pos]))
1077 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1078 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1079 (unsigned long long) colon_pos);
1081 while ((pos < frstat.st_size) && isspace (data[pos]))
1085 tsize = colon_pos - pos;
1086 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size))
1088 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1089 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1090 (unsigned long long) colon_pos);
1096 transport_name = GNUNET_malloc(tsize);
1097 memcpy(transport_name, &data[pos], tsize);
1098 pos = colon_pos + 1;
1101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1102 _("Read transport name %s in blacklist file.\n"),
1105 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1106 if (!isspace (enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1108 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1109 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1110 (unsigned long long) pos);
1112 while ((pos < frstat.st_size) && (!isspace (data[pos])))
1114 GNUNET_free_non_null(transport_name);
1117 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1118 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1120 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1121 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1122 (unsigned long long) pos,
1127 if (0 != memcmp (&pid,
1129 sizeof (struct GNUNET_PeerIdentity)))
1132 add_peer_to_blacklist (&pid,
1134 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1135 _("Found blacklisted peer `%s:%s' in configuration\n"),
1136 transport_name, GNUNET_i2s (&pid));
1140 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1141 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1145 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1146 GNUNET_free_non_null(transport_name);
1147 while ((pos < frstat.st_size) && isspace (data[pos]))
1156 * Function called to notify a client about the socket being ready to
1157 * queue more data. "buf" will be NULL and "size" zero if the socket
1158 * was closed for writing in the meantime.
1160 * @param cls closure
1161 * @param size number of bytes available in buf
1162 * @param buf where the callee should write the message
1163 * @return number of bytes written to buf
1166 transmit_to_client_callback (void *cls, size_t size, void *buf)
1168 struct TransportClient *client = cls;
1169 struct ClientMessageQueueEntry *q;
1172 const struct GNUNET_MessageHeader *msg;
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1179 "Transmission to client failed, closing connection.\n");
1180 /* fatal error with client, free message queue! */
1181 while (NULL != (q = client->message_queue_head))
1183 GNUNET_STATISTICS_update (stats,
1184 gettext_noop ("# bytes discarded (could not transmit to client)"),
1185 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1187 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1188 client->message_queue_tail,
1192 client->message_count = 0;
1197 while (NULL != (q = client->message_queue_head))
1199 msg = (const struct GNUNET_MessageHeader *) &q[1];
1200 msize = ntohs (msg->size);
1201 if (msize + tsize > size)
1204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1205 "Transmitting message of type %u to client.\n",
1208 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1209 client->message_queue_tail,
1211 memcpy (&cbuf[tsize], msg, msize);
1214 client->message_count--;
1218 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1219 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1221 GNUNET_TIME_UNIT_FOREVER_REL,
1222 &transmit_to_client_callback,
1224 GNUNET_assert (client->th != NULL);
1231 * Convert an address to a string.
1233 * @param plugin name of the plugin responsible for the address
1234 * @param addr binary address
1235 * @param addr_len number of bytes in addr
1236 * @return NULL on error, otherwise address string
1239 a2s (const char *plugin,
1243 struct TransportPlugin *p;
1247 p = find_transport (plugin);
1250 return p->api->address_to_string (p->api->cls,
1257 * Mark the given FAL entry as 'connected' (and hence preferred for
1258 * sending); also mark all others for the same peer as 'not connected'
1259 * (since only one can be preferred).
1261 * @param fal address to set to 'connected'
1264 mark_address_connected (struct ForeignAddressList *fal)
1266 struct ForeignAddressList *pos;
1269 GNUNET_assert (GNUNET_YES == fal->validated);
1270 if (fal->connected == GNUNET_YES)
1271 return; /* nothing to do */
1273 pos = fal->ready_list->addresses;
1276 if (GNUNET_YES == pos->connected)
1279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1280 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1281 a2s (pos->ready_list->plugin->short_name,
1285 GNUNET_break (cnt == GNUNET_YES);
1287 pos->connected = GNUNET_NO;
1288 GNUNET_STATISTICS_update (stats,
1289 gettext_noop ("# connected addresses"),
1295 fal->connected = GNUNET_YES;
1296 if (GNUNET_YES == cnt)
1298 GNUNET_STATISTICS_update (stats,
1299 gettext_noop ("# connected addresses"),
1307 * Send the specified message to the specified client. Since multiple
1308 * messages may be pending for the same client at a time, this code
1309 * makes sure that no message is lost.
1311 * @param client client to transmit the message to
1312 * @param msg the message to send
1313 * @param may_drop can this message be dropped if the
1314 * message queue for this client is getting far too large?
1317 transmit_to_client (struct TransportClient *client,
1318 const struct GNUNET_MessageHeader *msg, int may_drop)
1320 struct ClientMessageQueueEntry *q;
1323 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1325 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1327 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1330 client->message_count,
1332 GNUNET_STATISTICS_update (stats,
1333 gettext_noop ("# messages dropped due to slow client"),
1338 msize = ntohs (msg->size);
1339 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1340 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1341 memcpy (&q[1], msg, msize);
1342 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1343 client->message_queue_tail,
1344 client->message_queue_tail,
1346 client->message_count++;
1347 if (client->th == NULL)
1349 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1351 GNUNET_TIME_UNIT_FOREVER_REL,
1352 &transmit_to_client_callback,
1354 GNUNET_assert (client->th != NULL);
1360 * Transmit a 'SEND_OK' notification to the given client for the
1363 * @param client who to notify
1364 * @param n neighbour to notify about
1365 * @param result status code for the transmission request
1368 transmit_send_ok (struct TransportClient *client,
1369 struct NeighbourList *n,
1372 struct SendOkMessage send_ok_msg;
1374 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1375 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1376 send_ok_msg.success = htonl (result);
1377 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1378 send_ok_msg.peer = n->id;
1379 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1384 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1385 * upon "completion" of a send request. This tells the API
1386 * that it is now legal to send another message to the given
1389 * @param cls closure, identifies the entry on the
1390 * message queue that was transmitted and the
1391 * client responsible for queueing the message
1392 * @param target the peer receiving the message
1393 * @param result GNUNET_OK on success, if the transmission
1394 * failed, we should not tell the client to transmit
1398 transmit_send_continuation (void *cls,
1399 const struct GNUNET_PeerIdentity *target,
1402 struct MessageQueue *mq = cls;
1403 struct NeighbourList *n;
1405 GNUNET_STATISTICS_update (stats,
1406 gettext_noop ("# bytes pending with plugins"),
1407 - (int64_t) mq->message_buf_size,
1409 if (result == GNUNET_OK)
1411 GNUNET_STATISTICS_update (stats,
1412 gettext_noop ("# bytes successfully transmitted by plugins"),
1413 mq->message_buf_size,
1418 GNUNET_STATISTICS_update (stats,
1419 gettext_noop ("# bytes with transmission failure by plugins"),
1420 mq->message_buf_size,
1423 n = find_neighbour(&mq->neighbour_id);
1424 GNUNET_assert (n != NULL);
1425 if (mq->specific_address != NULL)
1427 if (result == GNUNET_OK)
1429 mq->specific_address->timeout =
1430 GNUNET_TIME_relative_to_absolute
1431 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1432 if (mq->specific_address->validated == GNUNET_YES)
1433 mark_address_connected (mq->specific_address);
1437 if (mq->specific_address->connected != GNUNET_NO)
1440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1441 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1442 a2s (mq->specific_address->ready_list->plugin->short_name,
1443 mq->specific_address->addr,
1444 mq->specific_address->addrlen));
1446 GNUNET_STATISTICS_update (stats,
1447 gettext_noop ("# connected addresses"),
1450 mq->specific_address->connected = GNUNET_NO;
1453 if (! mq->internal_msg)
1454 mq->specific_address->in_transmit = GNUNET_NO;
1456 if (mq->client != NULL)
1457 transmit_send_ok (mq->client, n, result);
1459 try_transmission_to_peer (n);
1464 * Find an address in any of the available transports for
1465 * the given neighbour that would be good for message
1466 * transmission. This is essentially the transport selection
1469 * @param neighbour for whom to select an address
1470 * @return selected address, NULL if we have none
1472 struct ForeignAddressList *
1473 find_ready_address(struct NeighbourList *neighbour)
1475 struct ReadyList *head = neighbour->plugins;
1476 struct ForeignAddressList *addresses;
1477 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1478 struct ForeignAddressList *best_address;
1480 best_address = NULL;
1481 while (head != NULL)
1483 addresses = head->addresses;
1484 while (addresses != NULL)
1486 if ( (addresses->timeout.value < now.value) &&
1487 (addresses->connected == GNUNET_YES) )
1490 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1491 "Marking long-time inactive connection to `%4s' as down.\n",
1492 GNUNET_i2s (&neighbour->id));
1494 GNUNET_STATISTICS_update (stats,
1495 gettext_noop ("# connected addresses"),
1498 addresses->connected = GNUNET_NO;
1500 addresses = addresses->next;
1503 addresses = head->addresses;
1504 while (addresses != NULL)
1506 #if DEBUG_TRANSPORT > 1
1507 if (addresses->addr != NULL)
1508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1509 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1510 a2s (head->plugin->short_name,
1512 addresses->addrlen),
1513 GNUNET_i2s (&neighbour->id),
1514 addresses->connected,
1515 addresses->in_transmit,
1516 addresses->validated,
1517 addresses->connect_attempts,
1518 (unsigned long long) addresses->timeout.value,
1519 (unsigned int) addresses->distance);
1521 if ( ( (best_address == NULL) ||
1522 (addresses->connected == GNUNET_YES) ||
1523 (best_address->connected == GNUNET_NO) ) &&
1524 (addresses->in_transmit == GNUNET_NO) &&
1525 ( (best_address == NULL) ||
1526 (addresses->latency.value < best_address->latency.value)) )
1527 best_address = addresses;
1528 /* FIXME: also give lower-latency addresses that are not
1529 connected a chance some times... */
1530 addresses = addresses->next;
1534 if (best_address != NULL)
1537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1538 "Best address found (`%s') has latency of %llu ms.\n",
1539 a2s (best_address->ready_list->plugin->short_name,
1541 best_address->addrlen),
1542 best_address->latency.value);
1547 GNUNET_STATISTICS_update (stats,
1548 gettext_noop ("# transmission attempts failed (no address)"),
1552 return best_address;
1558 * We should re-try transmitting to the given peer,
1559 * hopefully we've learned something in the meantime.
1562 retry_transmission_task (void *cls,
1563 const struct GNUNET_SCHEDULER_TaskContext *tc)
1565 struct NeighbourList *n = cls;
1567 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1568 try_transmission_to_peer (n);
1573 * Check the ready list for the given neighbour and if a plugin is
1574 * ready for transmission (and if we have a message), do so!
1576 * @param neighbour target peer for which to transmit
1579 try_transmission_to_peer (struct NeighbourList *neighbour)
1581 struct ReadyList *rl;
1582 struct MessageQueue *mq;
1583 struct GNUNET_TIME_Relative timeout;
1587 if (neighbour->messages_head == NULL)
1590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1591 "Transmission queue for `%4s' is empty\n",
1592 GNUNET_i2s (&neighbour->id));
1594 return; /* nothing to do */
1597 mq = neighbour->messages_head;
1598 force_address = GNUNET_YES;
1599 if (mq->specific_address == NULL)
1601 mq->specific_address = find_ready_address(neighbour);
1602 GNUNET_STATISTICS_update (stats,
1603 gettext_noop ("# transport selected peer address freely"),
1606 force_address = GNUNET_NO;
1608 if (mq->specific_address == NULL)
1610 GNUNET_STATISTICS_update (stats,
1611 gettext_noop ("# transport failed to selected peer address"),
1614 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1615 if (timeout.value == 0)
1618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1619 "No destination address available to transmit message of size %u to peer `%4s'\n",
1620 mq->message_buf_size,
1621 GNUNET_i2s (&mq->neighbour_id));
1623 GNUNET_STATISTICS_update (stats,
1624 gettext_noop ("# bytes in message queue for other peers"),
1625 - (int64_t) mq->message_buf_size,
1627 GNUNET_STATISTICS_update (stats,
1628 gettext_noop ("# bytes discarded (no destination address available)"),
1629 mq->message_buf_size,
1631 if (mq->client != NULL)
1632 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1633 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1634 neighbour->messages_tail,
1637 return; /* nobody ready */
1639 GNUNET_STATISTICS_update (stats,
1640 gettext_noop ("# message delivery deferred (no address)"),
1643 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1644 GNUNET_SCHEDULER_cancel (sched,
1645 neighbour->retry_task);
1646 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1648 &retry_transmission_task,
1651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1652 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1653 mq->message_buf_size,
1654 GNUNET_i2s (&mq->neighbour_id),
1657 /* FIXME: might want to trigger peerinfo lookup here
1658 (unless that's already pending...) */
1661 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1662 neighbour->messages_tail,
1664 if (mq->specific_address->connected == GNUNET_NO)
1665 mq->specific_address->connect_attempts++;
1666 rl = mq->specific_address->ready_list;
1667 mq->plugin = rl->plugin;
1668 if (!mq->internal_msg)
1669 mq->specific_address->in_transmit = GNUNET_YES;
1671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1672 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1673 mq->message_buf_size,
1674 GNUNET_i2s (&neighbour->id),
1675 (mq->specific_address->addr != NULL)
1676 ? a2s (mq->plugin->short_name,
1677 mq->specific_address->addr,
1678 mq->specific_address->addrlen)
1680 rl->plugin->short_name);
1682 GNUNET_STATISTICS_update (stats,
1683 gettext_noop ("# bytes in message queue for other peers"),
1684 - (int64_t) mq->message_buf_size,
1686 GNUNET_STATISTICS_update (stats,
1687 gettext_noop ("# bytes pending with plugins"),
1688 mq->message_buf_size,
1690 ret = rl->plugin->api->send (rl->plugin->api->cls,
1693 mq->message_buf_size,
1695 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1696 mq->specific_address->session,
1697 mq->specific_address->addr,
1698 mq->specific_address->addrlen,
1700 &transmit_send_continuation, mq);
1703 /* failure, but 'send' would not call continuation in this case,
1704 so we need to do it here! */
1705 transmit_send_continuation (mq,
1713 * Send the specified message to the specified peer.
1715 * @param client source of the transmission request (can be NULL)
1716 * @param peer_address ForeignAddressList where we should send this message
1717 * @param priority how important is the message
1718 * @param timeout how long do we have to transmit?
1719 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1720 * @param message_buf_size total size of all messages in message_buf
1721 * @param is_internal is this an internal message; these are pre-pended and
1722 * also do not count for plugins being "ready" to transmit
1723 * @param neighbour handle to the neighbour for transmission
1726 transmit_to_peer (struct TransportClient *client,
1727 struct ForeignAddressList *peer_address,
1728 unsigned int priority,
1729 struct GNUNET_TIME_Relative timeout,
1730 const char *message_buf,
1731 size_t message_buf_size,
1732 int is_internal, struct NeighbourList *neighbour)
1734 struct MessageQueue *mq;
1739 /* check for duplicate submission */
1740 mq = neighbour->messages_head;
1743 if (mq->client == client)
1745 /* client transmitted to same peer twice
1746 before getting SEND_OK! */
1754 GNUNET_STATISTICS_update (stats,
1755 gettext_noop ("# bytes in message queue for other peers"),
1758 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1759 mq->specific_address = peer_address;
1760 mq->client = client;
1761 memcpy (&mq[1], message_buf, message_buf_size);
1762 mq->message_buf = (const char*) &mq[1];
1763 mq->message_buf_size = message_buf_size;
1764 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1765 mq->internal_msg = is_internal;
1766 mq->priority = priority;
1767 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1769 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1770 neighbour->messages_tail,
1773 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1774 neighbour->messages_tail,
1775 neighbour->messages_tail,
1777 try_transmission_to_peer (neighbour);
1784 struct GeneratorContext
1786 struct TransportPlugin *plug_pos;
1787 struct OwnAddressList *addr_pos;
1788 struct GNUNET_TIME_Absolute expiration;
1796 address_generator (void *cls, size_t max, void *buf)
1798 struct GeneratorContext *gc = cls;
1801 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1803 gc->plug_pos = gc->plug_pos->next;
1804 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1806 if (NULL == gc->plug_pos)
1811 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1814 gc->addr_pos->addrlen, buf, max);
1815 gc->addr_pos = gc->addr_pos->next;
1821 * Construct our HELLO message from all of the addresses of
1822 * all of the transports.
1827 struct GNUNET_HELLO_Message *hello;
1828 struct TransportClient *cpos;
1829 struct NeighbourList *npos;
1830 struct GeneratorContext gc;
1832 gc.plug_pos = plugins;
1833 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1834 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1835 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1838 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1840 GNUNET_STATISTICS_update (stats,
1841 gettext_noop ("# refreshed my HELLO"),
1845 while (cpos != NULL)
1847 transmit_to_client (cpos,
1848 (const struct GNUNET_MessageHeader *) hello,
1853 GNUNET_free_non_null (our_hello);
1855 our_hello_version++;
1856 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1858 while (npos != NULL)
1861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1862 "Transmitting updated `%s' to neighbour `%4s'\n",
1863 "HELLO", GNUNET_i2s (&npos->id));
1865 GNUNET_STATISTICS_update (stats,
1866 gettext_noop ("# transmitted my HELLO to other peers"),
1869 transmit_to_peer (NULL, NULL, 0,
1870 HELLO_ADDRESS_EXPIRATION,
1871 (const char *) our_hello,
1872 GNUNET_HELLO_size(our_hello),
1880 * Task used to clean up expired addresses for a plugin.
1882 * @param cls closure
1886 expire_address_task (void *cls,
1887 const struct GNUNET_SCHEDULER_TaskContext *tc);
1891 * Update the list of addresses for this plugin,
1892 * expiring those that are past their expiration date.
1894 * @param plugin addresses of which plugin should be recomputed?
1895 * @param fresh set to GNUNET_YES if a new address was added
1896 * and we need to regenerate the HELLO even if nobody
1900 update_addresses (struct TransportPlugin *plugin, int fresh)
1902 static struct GNUNET_TIME_Absolute last_update;
1903 struct GNUNET_TIME_Relative min_remaining;
1904 struct GNUNET_TIME_Relative remaining;
1905 struct GNUNET_TIME_Absolute now;
1906 struct OwnAddressList *pos;
1907 struct OwnAddressList *prev;
1908 struct OwnAddressList *next;
1911 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1912 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1913 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1914 now = GNUNET_TIME_absolute_get ();
1915 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1916 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1918 pos = plugin->addresses;
1922 if (pos->expires.value < now.value)
1924 expired = GNUNET_YES;
1926 plugin->addresses = pos->next;
1928 prev->next = pos->next;
1933 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1934 if (remaining.value < min_remaining.value)
1935 min_remaining = remaining;
1941 if (expired || fresh)
1946 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1947 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1949 plugin->address_update_task
1950 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1952 &expire_address_task, plugin);
1957 * Task used to clean up expired addresses for a plugin.
1959 * @param cls closure
1963 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1965 struct TransportPlugin *plugin = cls;
1967 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1968 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1969 update_addresses (plugin, GNUNET_NO);
1974 * Iterator over hash map entries that NULLs the session of validation
1975 * entries that match the given session.
1977 * @param cls closure (the 'struct Session*' to match against)
1978 * @param key current key code (peer ID, not used)
1979 * @param value value in the hash map ('struct ValidationEntry*')
1980 * @return GNUNET_YES (we should continue to iterate)
1983 remove_session_validations (void *cls,
1984 const GNUNET_HashCode * key,
1987 struct Session *session = cls;
1988 struct ValidationEntry *ve = value;
1990 if (session == ve->session)
1997 * Function that will be called whenever the plugin internally
1998 * cleans up a session pointer and hence the service needs to
1999 * discard all of those sessions as well. Plugins that do not
2000 * use sessions can simply omit calling this function and always
2001 * use NULL wherever a session pointer is needed.
2003 * @param cls closure
2004 * @param peer which peer was the session for
2005 * @param session which session is being destoyed
2008 plugin_env_session_end (void *cls,
2009 const struct GNUNET_PeerIdentity *peer,
2010 struct Session *session)
2012 struct TransportPlugin *p = cls;
2013 struct NeighbourList *nl;
2014 struct ReadyList *rl;
2015 struct ForeignAddressList *pos;
2016 struct ForeignAddressList *prev;
2018 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2019 &remove_session_validations,
2021 nl = find_neighbour (peer);
2027 if (rl->plugin == p)
2034 pos = rl->addresses;
2035 while ( (pos != NULL) &&
2036 (pos->session != session) )
2043 pos->session = NULL;
2044 if (pos->addrlen != 0)
2047 rl->addresses = pos->next;
2049 prev->next = pos->next;
2050 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2052 GNUNET_SCHEDULER_cancel (sched,
2053 pos->revalidate_task);
2054 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2057 if (nl->received_pong == GNUNET_NO)
2058 return; /* nothing to do */
2059 /* check if we have any validated addresses left */
2060 pos = rl->addresses;
2067 /* no valid addresses left, signal disconnect! */
2068 disconnect_neighbour (nl, GNUNET_NO);
2073 * Function that must be called by each plugin to notify the
2074 * transport service about the addresses under which the transport
2075 * provided by the plugin can be reached.
2077 * @param cls closure
2078 * @param name name of the transport that generated the address
2079 * @param addr one of the addresses of the host, NULL for the last address
2080 * the specific address format depends on the transport
2081 * @param addrlen length of the address
2082 * @param expires when should this address automatically expire?
2085 plugin_env_notify_address (void *cls,
2089 struct GNUNET_TIME_Relative expires)
2091 struct TransportPlugin *p = cls;
2092 struct OwnAddressList *al;
2093 struct GNUNET_TIME_Absolute abex;
2095 GNUNET_assert (addr != NULL);
2096 abex = GNUNET_TIME_relative_to_absolute (expires);
2097 GNUNET_assert (p == find_transport (name));
2101 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2103 if (al->expires.value < abex.value)
2110 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2112 al->next = p->addresses;
2115 al->addrlen = addrlen;
2116 memcpy (&al[1], addr, addrlen);
2117 update_addresses (p, GNUNET_YES);
2122 * Notify all of our clients about a peer connecting.
2125 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2126 struct GNUNET_TIME_Relative latency,
2129 struct ConnectInfoMessage cim;
2130 struct TransportClient *cpos;
2133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2134 "Notifying clients about connection from `%s'\n",
2137 GNUNET_STATISTICS_update (stats,
2138 gettext_noop ("# peers connected"),
2141 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2142 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2143 cim.distance = htonl (distance);
2144 cim.latency = GNUNET_TIME_relative_hton (latency);
2145 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2147 while (cpos != NULL)
2149 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2156 * Notify all of our clients about a peer disconnecting.
2159 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2161 struct DisconnectInfoMessage dim;
2162 struct TransportClient *cpos;
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2166 "Notifying clients about lost connection to `%s'\n",
2169 GNUNET_STATISTICS_update (stats,
2170 gettext_noop ("# peers connected"),
2173 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2174 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2175 dim.reserved = htonl (0);
2176 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2178 while (cpos != NULL)
2180 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2187 * Find a ForeignAddressList entry for the given neighbour
2188 * that matches the given address and transport.
2190 * @param neighbour which peer we care about
2191 * @param tname name of the transport plugin
2192 * @param session session to look for, NULL for 'any'; otherwise
2193 * can be used for the service to "learn" this session ID
2195 * @param addr binary address
2196 * @param addrlen length of addr
2197 * @return NULL if no such entry exists
2199 static struct ForeignAddressList *
2200 find_peer_address(struct NeighbourList *neighbour,
2202 struct Session *session,
2206 struct ReadyList *head;
2207 struct ForeignAddressList *pos;
2209 head = neighbour->plugins;
2210 while (head != NULL)
2212 if (0 == strcmp (tname, head->plugin->short_name))
2218 pos = head->addresses;
2219 while ( (pos != NULL) &&
2220 ( (pos->addrlen != addrlen) ||
2221 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2223 if ( (session != NULL) &&
2224 (pos->session == session) )
2228 if ( (session != NULL) && (pos != NULL) )
2229 pos->session = session; /* learn it! */
2235 * Get the peer address struct for the given neighbour and
2236 * address. If it doesn't yet exist, create it.
2238 * @param neighbour which peer we care about
2239 * @param tname name of the transport plugin
2240 * @param session session of the plugin, or NULL for none
2241 * @param addr binary address
2242 * @param addrlen length of addr
2243 * @return NULL if we do not have a transport plugin for 'tname'
2245 static struct ForeignAddressList *
2246 add_peer_address (struct NeighbourList *neighbour,
2248 struct Session *session,
2252 struct ReadyList *head;
2253 struct ForeignAddressList *ret;
2255 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2258 head = neighbour->plugins;
2260 while (head != NULL)
2262 if (0 == strcmp (tname, head->plugin->short_name))
2268 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2269 ret->session = session;
2272 ret->addr = (const char*) &ret[1];
2273 memcpy (&ret[1], addr, addrlen);
2279 ret->addrlen = addrlen;
2280 ret->expires = GNUNET_TIME_relative_to_absolute
2281 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2282 ret->latency = GNUNET_TIME_relative_get_forever();
2284 ret->timeout = GNUNET_TIME_relative_to_absolute
2285 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2286 ret->ready_list = head;
2287 ret->next = head->addresses;
2288 head->addresses = ret;
2294 * Closure for 'add_validated_address'.
2296 struct AddValidatedAddressContext
2299 * Entry that has been validated.
2301 const struct ValidationEntry *ve;
2304 * Flag set after we have added the address so
2305 * that we terminate the iteration next time.
2312 * Callback function used to fill a buffer of max bytes with a list of
2313 * addresses in the format used by HELLOs. Should use
2314 * "GNUNET_HELLO_add_address" as a helper function.
2316 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2317 * @param max maximum number of bytes that can be written to buf
2318 * @param buf where to write the address information
2319 * @return number of bytes written, 0 to signal the
2320 * end of the iteration.
2323 add_validated_address (void *cls,
2324 size_t max, void *buf)
2326 struct AddValidatedAddressContext *avac = cls;
2327 const struct ValidationEntry *ve = avac->ve;
2329 if (GNUNET_YES == avac->done)
2331 avac->done = GNUNET_YES;
2332 return GNUNET_HELLO_add_address (ve->transport_name,
2333 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2343 * Closure for 'check_address_exists'.
2345 struct CheckAddressExistsClosure
2348 * Address to check for.
2353 * Name of the transport.
2360 struct Session *session;
2363 * Set to GNUNET_YES if the address exists.
2376 * Iterator over hash map entries. Checks if the given
2377 * validation entry is for the same address as what is given
2380 * @param cls the 'struct CheckAddressExistsClosure*'
2381 * @param key current key code (ignored)
2382 * @param value value in the hash map ('struct ValidationEntry')
2383 * @return GNUNET_YES if we should continue to
2384 * iterate (mismatch), GNUNET_NO if not (entry matched)
2387 check_address_exists (void *cls,
2388 const GNUNET_HashCode * key,
2391 struct CheckAddressExistsClosure *caec = cls;
2392 struct ValidationEntry *ve = value;
2394 if ( (0 == strcmp (caec->tname,
2395 ve->transport_name)) &&
2396 (caec->addrlen == ve->addrlen) &&
2397 (0 == memcmp (caec->addr,
2401 caec->exists = GNUNET_YES;
2404 if ( (ve->session != NULL) &&
2405 (caec->session == ve->session) )
2407 caec->exists = GNUNET_YES;
2416 * Iterator to free entries in the validation_map.
2418 * @param cls closure (unused)
2419 * @param key current key code
2420 * @param value value in the hash map (validation to abort)
2421 * @return GNUNET_YES (always)
2424 abort_validation (void *cls,
2425 const GNUNET_HashCode * key,
2428 struct ValidationEntry *va = value;
2430 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2431 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
2432 GNUNET_free (va->transport_name);
2433 if (va->chvc != NULL)
2435 va->chvc->ve_count--;
2436 if (va->chvc->ve_count == 0)
2438 GNUNET_CONTAINER_DLL_remove (chvc_head,
2441 GNUNET_free (va->chvc);
2451 * HELLO validation cleanup task (validation failed).
2453 * @param cls the 'struct ValidationEntry' that failed
2454 * @param tc scheduler context (unused)
2457 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2459 struct ValidationEntry *va = cls;
2460 struct GNUNET_PeerIdentity pid;
2462 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2463 GNUNET_STATISTICS_update (stats,
2464 gettext_noop ("# address validation timeouts"),
2467 GNUNET_CRYPTO_hash (&va->publicKey,
2469 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2471 GNUNET_break (GNUNET_OK ==
2472 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2475 abort_validation (NULL, NULL, va);
2480 neighbour_timeout_task (void *cls,
2481 const struct GNUNET_SCHEDULER_TaskContext *tc)
2483 struct NeighbourList *n = cls;
2486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2487 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2489 GNUNET_STATISTICS_update (stats,
2490 gettext_noop ("# disconnects due to timeout"),
2493 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2494 disconnect_neighbour (n, GNUNET_NO);
2499 * Schedule the job that will cause us to send a PING to the
2500 * foreign address to evaluate its validity and latency.
2502 * @param fal address to PING
2505 schedule_next_ping (struct ForeignAddressList *fal);
2509 * Add the given address to the list of foreign addresses
2510 * available for the given peer (check for duplicates).
2512 * @param cls the respective 'struct NeighbourList' to update
2513 * @param tname name of the transport
2514 * @param expiration expiration time
2515 * @param addr the address
2516 * @param addrlen length of the address
2517 * @return GNUNET_OK (always)
2520 add_to_foreign_address_list (void *cls,
2522 struct GNUNET_TIME_Absolute expiration,
2526 struct NeighbourList *n = cls;
2527 struct ForeignAddressList *fal;
2530 GNUNET_STATISTICS_update (stats,
2531 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2535 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2540 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2541 a2s (tname, addr, addrlen),
2543 GNUNET_i2s (&n->id),
2546 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2549 GNUNET_STATISTICS_update (stats,
2550 gettext_noop ("# previously validated addresses lacking transport"),
2556 fal->expires = GNUNET_TIME_absolute_max (expiration,
2558 schedule_next_ping (fal);
2564 fal->expires = GNUNET_TIME_absolute_max (expiration,
2569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2570 "Failed to add new address for `%4s'\n",
2571 GNUNET_i2s (&n->id));
2574 if (fal->validated == GNUNET_NO)
2576 fal->validated = GNUNET_YES;
2577 GNUNET_STATISTICS_update (stats,
2578 gettext_noop ("# peer addresses considered valid"),
2582 if (try == GNUNET_YES)
2584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2585 "Have new addresses, will try to trigger transmissions.\n");
2586 try_transmission_to_peer (n);
2593 * Add addresses in validated HELLO "h" to the set of addresses
2594 * we have for this peer.
2596 * @param cls closure ('struct NeighbourList*')
2597 * @param peer id of the peer, NULL for last call
2598 * @param h hello message for the peer (can be NULL)
2599 * @param trust amount of trust we have in the peer (not used)
2602 add_hello_for_peer (void *cls,
2603 const struct GNUNET_PeerIdentity *peer,
2604 const struct GNUNET_HELLO_Message *h,
2607 struct NeighbourList *n = cls;
2615 return; /* no HELLO available */
2617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2618 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2622 if (GNUNET_YES != n->public_key_valid)
2624 GNUNET_HELLO_get_key (h, &n->publicKey);
2625 n->public_key_valid = GNUNET_YES;
2627 GNUNET_HELLO_iterate_addresses (h,
2629 &add_to_foreign_address_list,
2635 * Create a fresh entry in our neighbour list for the given peer.
2636 * Will try to transmit our current HELLO to the new neighbour.
2637 * Do not call this function directly, use 'setup_peer_check_blacklist.
2639 * @param peer the peer for which we create the entry
2640 * @param do_hello should we schedule transmitting a HELLO
2641 * @return the new neighbour list entry
2643 static struct NeighbourList *
2644 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2647 struct NeighbourList *n;
2648 struct TransportPlugin *tp;
2649 struct ReadyList *rl;
2652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2653 "Setting up state for neighbour `%4s'\n",
2656 GNUNET_assert (our_hello != NULL);
2657 GNUNET_STATISTICS_update (stats,
2658 gettext_noop ("# active neighbours"),
2661 n = GNUNET_malloc (sizeof (struct NeighbourList));
2662 n->next = neighbours;
2666 GNUNET_TIME_relative_to_absolute
2667 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2668 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2669 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2670 MAX_BANDWIDTH_CARRY_S);
2674 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2676 rl = GNUNET_malloc (sizeof (struct ReadyList));
2678 rl->next = n->plugins;
2681 rl->addresses = NULL;
2685 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2687 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2688 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2689 &neighbour_timeout_task, n);
2692 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2693 0, GNUNET_TIME_UNIT_FOREVER_REL,
2694 &add_hello_for_peer, n);
2695 transmit_to_peer (NULL, NULL, 0,
2696 HELLO_ADDRESS_EXPIRATION,
2697 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2705 * Function called after we have checked if communicating
2706 * with a given peer is acceptable.
2708 * @param cls closure
2709 * @param n NULL if communication is not acceptable
2711 typedef void (*SetupContinuation)(void *cls,
2712 struct NeighbourList *n);
2716 * Information kept for each client registered to perform
2722 * This is a linked list.
2724 struct Blacklisters *next;
2727 * This is a linked list.
2729 struct Blacklisters *prev;
2732 * Client responsible for this entry.
2734 struct GNUNET_SERVER_Client *client;
2737 * Blacklist check that we're currently performing.
2739 struct BlacklistCheck *bc;
2745 * Head of DLL of blacklisting clients.
2747 static struct Blacklisters *bl_head;
2750 * Tail of DLL of blacklisting clients.
2752 static struct Blacklisters *bl_tail;
2756 * Context we use when performing a blacklist check.
2758 struct BlacklistCheck
2762 * This is a linked list.
2764 struct BlacklistCheck *next;
2767 * This is a linked list.
2769 struct BlacklistCheck *prev;
2772 * Peer being checked.
2774 struct GNUNET_PeerIdentity peer;
2777 * Option for setup neighbour afterwards.
2782 * Continuation to call with the result.
2784 SetupContinuation cont;
2792 * Current transmission request handle for this client, or NULL if no
2793 * request is pending.
2795 struct GNUNET_CONNECTION_TransmitHandle *th;
2798 * Our current position in the blacklisters list.
2800 struct Blacklisters *bl_pos;
2803 * Current task performing the check.
2805 GNUNET_SCHEDULER_TaskIdentifier task;
2810 * Head of DLL of active blacklisting queries.
2812 static struct BlacklistCheck *bc_head;
2815 * Tail of DLL of active blacklisting queries.
2817 static struct BlacklistCheck *bc_tail;
2821 * Perform next action in the blacklist check.
2823 * @param cls the 'struct BlacklistCheck*'
2827 do_blacklist_check (void *cls,
2828 const struct GNUNET_SCHEDULER_TaskContext *tc);
2832 * Transmit blacklist query to the client.
2834 * @param cls the 'struct BlacklistCheck'
2835 * @param size number of bytes allowed
2836 * @param buf where to copy the message
2837 * @return number of bytes copied to buf
2840 transmit_blacklist_message (void *cls,
2844 struct BlacklistCheck *bc = cls;
2845 struct Blacklisters *bl;
2846 struct BlacklistMessage bm;
2851 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2852 bc->task = GNUNET_SCHEDULER_add_now (sched,
2853 &do_blacklist_check,
2858 bm.header.size = htons (sizeof (struct BlacklistMessage));
2859 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2860 bm.is_allowed = htonl (0);
2862 memcpy (buf, &bm, sizeof (bm));
2863 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2869 * Perform next action in the blacklist check.
2871 * @param cls the 'struct BlacklistCheck*'
2875 do_blacklist_check (void *cls,
2876 const struct GNUNET_SCHEDULER_TaskContext *tc)
2878 struct BlacklistCheck *bc = cls;
2879 struct Blacklisters *bl;
2881 bc->task = GNUNET_SCHEDULER_NO_TASK;
2885 bc->cont (bc->cont_cls,
2886 setup_new_neighbour (&bc->peer, bc->do_hello));
2893 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2894 sizeof (struct BlacklistMessage),
2895 GNUNET_TIME_UNIT_FOREVER_REL,
2896 &transmit_blacklist_message,
2903 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2904 * does not yet exist, check the blacklist. If the blacklist says creating
2905 * one is acceptable, create one and call the continuation; otherwise
2906 * call the continuation with NULL.
2908 * @param peer peer to setup or look up a struct NeighbourList for
2909 * @param do_hello should we also schedule sending our HELLO to the peer
2910 * if this is a new record
2911 * @param cont function to call with the 'struct NeigbhbourList*'
2912 * @param cont_cls closure for cont
2915 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
2917 SetupContinuation cont,
2920 struct NeighbourList *n;
2921 struct BlacklistCheck *bc;
2923 n = find_neighbour(peer);
2929 if (bl_head == NULL)
2932 setup_new_neighbour (peer, do_hello));
2935 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2936 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2938 bc->do_hello = do_hello;
2940 bc->cont_cls = cont_cls;
2941 bc->bl_pos = bl_head;
2942 bc->task = GNUNET_SCHEDULER_add_now (sched,
2943 &do_blacklist_check,
2949 * Function called with the result of querying a new blacklister about
2950 * it being allowed (or not) to continue to talk to an existing neighbour.
2952 * @param cls the original 'struct NeighbourList'
2953 * @param n NULL if we need to disconnect
2956 confirm_or_drop_neighbour (void *cls,
2957 struct NeighbourList *n)
2959 struct NeighbourList * orig = cls;
2962 disconnect_neighbour (orig, GNUNET_NO);
2967 * Handle a request to start a blacklist.
2969 * @param cls closure (always NULL)
2970 * @param client identification of the client
2971 * @param message the actual message
2974 handle_blacklist_init (void *cls,
2975 struct GNUNET_SERVER_Client *client,
2976 const struct GNUNET_MessageHeader *message)
2978 struct Blacklisters *bl;
2979 struct BlacklistCheck *bc;
2980 struct NeighbourList *n;
2985 if (bl->client == client)
2988 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2993 bl = GNUNET_malloc (sizeof (struct Blacklisters));
2994 bl->client = client;
2995 GNUNET_SERVER_client_keep (client);
2996 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
2997 /* confirm that all existing connections are OK! */
3001 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3002 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3004 bc->do_hello = GNUNET_NO;
3005 bc->cont = &confirm_or_drop_neighbour;
3008 if (n == neighbours) /* all would wait for the same client, no need to
3009 create more than just the first task right now */
3010 bc->task = GNUNET_SCHEDULER_add_now (sched,
3011 &do_blacklist_check,
3019 * Handle a request to blacklist a peer.
3021 * @param cls closure (always NULL)
3022 * @param client identification of the client
3023 * @param message the actual message
3026 handle_blacklist_reply (void *cls,
3027 struct GNUNET_SERVER_Client *client,
3028 const struct GNUNET_MessageHeader *message)
3030 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3031 struct Blacklisters *bl;
3032 struct BlacklistCheck *bc;
3035 while ( (bl != NULL) &&
3036 (bl->client != client) )
3040 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3045 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3047 bc->cont (bc->cont_cls, NULL);
3048 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3053 bc->bl_pos = bc->bl_pos->next;
3054 bc->task = GNUNET_SCHEDULER_add_now (sched,
3055 &do_blacklist_check,
3058 /* check if any other bc's are waiting for this blacklister */
3062 if ( (bc->bl_pos == bl) &&
3063 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3064 bc->task = GNUNET_SCHEDULER_add_now (sched,
3065 &do_blacklist_check,
3073 * Send periodic PING messages to a given foreign address.
3075 * @param cls our 'struct PeriodicValidationContext*'
3076 * @param tc task context
3079 send_periodic_ping (void *cls,
3080 const struct GNUNET_SCHEDULER_TaskContext *tc)
3082 struct ForeignAddressList *peer_address = cls;
3083 struct TransportPlugin *tp;
3084 struct ValidationEntry *va;
3085 struct NeighbourList *neighbour;
3086 struct TransportPingMessage ping;
3087 struct CheckAddressExistsClosure caec;
3089 uint16_t hello_size;
3092 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3093 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3095 tp = peer_address->ready_list->plugin;
3096 neighbour = peer_address->ready_list->neighbour;
3097 if (GNUNET_YES != neighbour->public_key_valid)
3099 /* no public key yet, try again later */
3100 schedule_next_ping (peer_address);
3103 caec.addr = peer_address->addr;
3104 caec.addrlen = peer_address->addrlen;
3105 caec.tname = tp->short_name;
3106 caec.session = peer_address->session;
3107 caec.exists = GNUNET_NO;
3108 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3109 &check_address_exists,
3111 if (caec.exists == GNUNET_YES)
3113 /* During validation attempts we will likely trigger the other
3114 peer trying to validate our address which in turn will cause
3115 it to send us its HELLO, so we expect to hit this case rather
3116 frequently. Only print something if we are very verbose. */
3117 #if DEBUG_TRANSPORT > 1
3118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3119 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3120 (peer_address->addr != NULL)
3121 ? a2s (tp->short_name,
3123 peer_address->addrlen)
3126 GNUNET_i2s (&neighbour->id));
3128 schedule_next_ping (peer_address);
3131 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3132 va->transport_name = GNUNET_strdup (tp->short_name);
3133 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3135 va->send_time = GNUNET_TIME_absolute_get();
3136 va->session = peer_address->session;
3137 if (peer_address->addr != NULL)
3139 va->addr = (const void*) &va[1];
3140 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3141 va->addrlen = peer_address->addrlen;
3143 memcpy(&va->publicKey,
3144 &neighbour->publicKey,
3145 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3147 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3148 HELLO_VERIFICATION_TIMEOUT,
3149 &timeout_hello_validation,
3151 GNUNET_CONTAINER_multihashmap_put (validation_map,
3152 &neighbour->id.hashPubKey,
3154 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3155 hello_size = GNUNET_HELLO_size(our_hello);
3156 tsize = sizeof(struct TransportPingMessage) + hello_size;
3157 message_buf = GNUNET_malloc(tsize);
3158 ping.challenge = htonl(va->challenge);
3159 ping.header.size = htons(sizeof(struct TransportPingMessage));
3160 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3161 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3162 memcpy(message_buf, our_hello, hello_size);
3163 memcpy(&message_buf[hello_size],
3165 sizeof(struct TransportPingMessage));
3166 #if DEBUG_TRANSPORT_REVALIDATION
3167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3168 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3169 (peer_address->addr != NULL)
3170 ? a2s (peer_address->plugin->short_name,
3172 peer_address->addrlen)
3175 GNUNET_i2s (&neighbour->id),
3176 "HELLO", hello_size,
3177 "PING", sizeof (struct TransportPingMessage));
3179 GNUNET_STATISTICS_update (stats,
3180 gettext_noop ("# PING messages sent for re-validation"),
3183 transmit_to_peer (NULL, peer_address,
3184 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3185 HELLO_VERIFICATION_TIMEOUT,
3187 GNUNET_YES, neighbour);
3188 GNUNET_free(message_buf);
3189 schedule_next_ping (peer_address);
3194 * Schedule the job that will cause us to send a PING to the
3195 * foreign address to evaluate its validity and latency.
3197 * @param fal address to PING
3200 schedule_next_ping (struct ForeignAddressList *fal)
3202 struct GNUNET_TIME_Relative delay;
3204 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3206 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3207 delay.value /= 2; /* do before expiration */
3208 delay = GNUNET_TIME_relative_min (delay,
3209 LATENCY_EVALUATION_MAX_DELAY);
3210 if (GNUNET_YES != fal->estimated)
3212 delay = GNUNET_TIME_UNIT_ZERO;
3213 fal->estimated = GNUNET_YES;
3215 if (GNUNET_YES == fal->connected)
3217 delay = GNUNET_TIME_relative_min (delay,
3218 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3220 /* FIXME: also adjust delay based on how close the last
3221 observed latency is to the latency of the best alternative */
3222 /* bound how fast we can go */
3223 delay = GNUNET_TIME_relative_max (delay,
3224 GNUNET_TIME_UNIT_SECONDS);
3225 /* randomize a bit (to avoid doing all at the same time) */
3226 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3227 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3229 &send_periodic_ping,
3237 * Function that will be called if we receive some payload
3238 * from another peer.
3240 * @param message the payload
3241 * @param n peer who claimed to be the sender
3244 handle_payload_message (const struct GNUNET_MessageHeader *message,
3245 struct NeighbourList *n)
3247 struct InboundMessage *im;
3248 struct TransportClient *cpos;
3251 msize = ntohs (message->size);
3252 if (n->received_pong == GNUNET_NO)
3254 GNUNET_free_non_null (n->pre_connect_message_buffer);
3255 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3256 memcpy (n->pre_connect_message_buffer, message, msize);
3260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3261 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3262 ntohs (message->type),
3263 ntohs (message->size),
3264 GNUNET_i2s (&n->id));
3266 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3269 n->quota_violation_count++;
3271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3272 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3273 n->in_tracker.available_bytes_per_s__,
3274 n->quota_violation_count);
3276 /* Discount 32k per violation */
3277 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3282 if (n->quota_violation_count > 0)
3284 /* try to add 32k back */
3285 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3287 n->quota_violation_count--;
3290 GNUNET_STATISTICS_update (stats,
3291 gettext_noop ("# payload received from other peers"),
3294 /* transmit message to all clients */
3295 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3296 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3297 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3298 im->latency = GNUNET_TIME_relative_hton (n->latency);
3300 im->distance = ntohl(n->distance);
3301 memcpy (&im[1], message, msize);
3303 while (cpos != NULL)
3305 transmit_to_client (cpos, &im->header, GNUNET_YES);
3313 * Iterator over hash map entries. Checks if the given validation
3314 * entry is for the same challenge as what is given in the PONG.
3316 * @param cls the 'struct TransportPongMessage*'
3317 * @param key peer identity
3318 * @param value value in the hash map ('struct ValidationEntry')
3319 * @return GNUNET_YES if we should continue to
3320 * iterate (mismatch), GNUNET_NO if not (entry matched)
3323 check_pending_validation (void *cls,
3324 const GNUNET_HashCode * key,
3327 const struct TransportPongMessage *pong = cls;
3328 struct ValidationEntry *ve = value;
3329 struct AddValidatedAddressContext avac;
3330 unsigned int challenge = ntohl(pong->challenge);
3331 struct GNUNET_HELLO_Message *hello;
3332 struct GNUNET_PeerIdentity target;
3333 struct NeighbourList *n;
3334 struct ForeignAddressList *fal;
3335 struct GNUNET_MessageHeader *prem;
3337 if (ve->challenge != challenge)
3342 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING,
3347 GNUNET_break_op (0);
3353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3354 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3357 ? a2s (ve->transport_name,
3358 (const struct sockaddr *) ve->addr,
3361 ve->transport_name);
3363 GNUNET_STATISTICS_update (stats,
3364 gettext_noop ("# address validation successes"),
3367 /* create the updated HELLO */
3368 GNUNET_CRYPTO_hash (&ve->publicKey,
3369 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3370 &target.hashPubKey);
3371 if (ve->addr != NULL)
3373 avac.done = GNUNET_NO;
3375 hello = GNUNET_HELLO_create (&ve->publicKey,
3376 &add_validated_address,
3378 GNUNET_PEERINFO_add_peer (peerinfo,
3380 GNUNET_free (hello);
3382 n = find_neighbour (&target);
3385 n->publicKey = ve->publicKey;
3386 n->public_key_valid = GNUNET_YES;
3387 fal = add_peer_address (n,
3392 GNUNET_assert (fal != NULL);
3393 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3394 fal->validated = GNUNET_YES;
3395 mark_address_connected (fal);
3396 GNUNET_STATISTICS_update (stats,
3397 gettext_noop ("# peer addresses considered valid"),
3400 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3401 schedule_next_ping (fal);
3402 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
3403 n->latency = fal->latency;
3405 n->latency.value = (fal->latency.value + n->latency.value) / 2;
3407 n->distance = fal->distance;
3408 if (GNUNET_NO == n->received_pong)
3410 n->received_pong = GNUNET_YES;
3411 notify_clients_connect (&target, n->latency, n->distance);
3412 if (NULL != (prem = n->pre_connect_message_buffer))
3414 n->pre_connect_message_buffer = NULL;
3415 handle_payload_message (prem, n);
3419 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3421 GNUNET_SCHEDULER_cancel (sched,
3423 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3424 try_transmission_to_peer (n);
3428 /* clean up validation entry */
3429 GNUNET_assert (GNUNET_YES ==
3430 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3433 abort_validation (NULL, NULL, ve);
3439 * Function that will be called if we receive a validation
3440 * of an address challenge that we transmitted to another
3441 * peer. Note that the validation should only be considered
3442 * acceptable if the challenge matches AND if the sender
3443 * address is at least a plausible address for this peer
3444 * (otherwise we may be seeing a MiM attack).
3446 * @param cls closure
3447 * @param message the pong message
3448 * @param peer who responded to our challenge
3449 * @param sender_address string describing our sender address (as observed
3450 * by the other peer in binary format)
3451 * @param sender_address_len number of bytes in 'sender_address'
3454 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3455 const struct GNUNET_PeerIdentity *peer,
3456 const char *sender_address,
3457 size_t sender_address_len)
3459 #if DEBUG_TRANSPORT > 1
3460 /* we get tons of these that just get discarded, only log
3461 if we are quite verbose */
3462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3463 "Receiving `%s' message from `%4s'.\n", "PONG",
3466 GNUNET_STATISTICS_update (stats,
3467 gettext_noop ("# PONG messages received"),
3470 if (GNUNET_SYSERR !=
3471 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3473 &check_pending_validation,
3476 /* This is *expected* to happen a lot since we send
3477 PONGs to *all* known addresses of the sender of
3478 the PING, so most likely we get multiple PONGs
3479 per PING, and all but the first PONG will end up
3480 here. So really we should not print anything here
3481 unless we want to be very, very verbose... */
3482 #if DEBUG_TRANSPORT > 2
3483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3484 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3496 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3498 * @param cls the 'struct ValidationEntry*'
3499 * @param neighbour neighbour to validate, NULL if validation failed
3502 transmit_hello_and_ping (void *cls,
3503 struct NeighbourList *neighbour)
3505 struct ValidationEntry *va = cls;
3506 struct ForeignAddressList *peer_address;
3507 struct TransportPingMessage ping;
3508 uint16_t hello_size;
3511 struct GNUNET_PeerIdentity id;
3513 GNUNET_CRYPTO_hash (&va->publicKey,
3514 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3516 if (neighbour == NULL)
3518 /* FIXME: stats... */
3519 GNUNET_break (GNUNET_OK ==
3520 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3523 abort_validation (NULL, NULL, va);
3526 neighbour->publicKey = va->publicKey;
3527 neighbour->public_key_valid = GNUNET_YES;
3528 peer_address = add_peer_address (neighbour,
3529 va->transport_name, NULL,
3530 (const void*) &va[1],
3532 if (peer_address == NULL)
3534 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3535 "Failed to add peer `%4s' for plugin `%s'\n",
3536 GNUNET_i2s (&neighbour->id),
3537 va->transport_name);
3538 GNUNET_break (GNUNET_OK ==
3539 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3542 abort_validation (NULL, NULL, va);
3545 hello_size = GNUNET_HELLO_size(our_hello);
3546 tsize = sizeof(struct TransportPingMessage) + hello_size;
3547 message_buf = GNUNET_malloc(tsize);
3548 ping.challenge = htonl(va->challenge);
3549 ping.header.size = htons(sizeof(struct TransportPingMessage));
3550 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3551 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3552 memcpy(message_buf, our_hello, hello_size);
3553 memcpy(&message_buf[hello_size],
3555 sizeof(struct TransportPingMessage));
3557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3558 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3559 a2s (va->transport_name,
3560 (const void*) &va[1], va->addrlen),
3562 GNUNET_i2s (&neighbour->id),
3563 "HELLO", hello_size,
3564 "PING", sizeof (struct TransportPingMessage));
3566 GNUNET_STATISTICS_update (stats,
3567 gettext_noop ("# PING messages sent for initial validation"),
3570 transmit_to_peer (NULL, peer_address,
3571 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3572 HELLO_VERIFICATION_TIMEOUT,
3574 GNUNET_YES, neighbour);
3575 GNUNET_free(message_buf);
3580 * Check if the given address is already being validated; if not,
3581 * append the given address to the list of entries that are being be
3582 * validated and initiate validation.
3584 * @param cls closure ('struct CheckHelloValidatedContext *')
3585 * @param tname name of the transport
3586 * @param expiration expiration time
3587 * @param addr the address
3588 * @param addrlen length of the address
3589 * @return GNUNET_OK (always)
3592 run_validation (void *cls,
3594 struct GNUNET_TIME_Absolute expiration,
3598 struct CheckHelloValidatedContext *chvc = cls;
3599 struct GNUNET_PeerIdentity id;
3600 struct TransportPlugin *tp;
3601 struct ValidationEntry *va;
3602 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3603 struct CheckAddressExistsClosure caec;
3604 struct OwnAddressList *oal;
3606 GNUNET_assert (addr != NULL);
3607 GNUNET_STATISTICS_update (stats,
3608 gettext_noop ("# peer addresses scheduled for validation"),
3611 tp = find_transport (tname);
3614 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3615 GNUNET_ERROR_TYPE_BULK,
3617 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3619 GNUNET_STATISTICS_update (stats,
3620 gettext_noop ("# peer addresses not validated (plugin not available)"),
3625 /* check if this is one of our own addresses */
3626 oal = tp->addresses;
3629 if ( (oal->addrlen == addrlen) &&
3630 (0 == memcmp (oal->addr,
3634 /* not plausible, this address is equivalent to our own address! */
3635 GNUNET_STATISTICS_update (stats,
3636 gettext_noop ("# peer addresses not validated (loopback)"),
3643 GNUNET_HELLO_get_key (chvc->hello, &pk);
3644 GNUNET_CRYPTO_hash (&pk,
3646 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3649 if (is_blacklisted(&id, tp))
3652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3653 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3661 caec.addrlen = addrlen;
3662 caec.session = NULL;
3664 caec.exists = GNUNET_NO;
3665 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3666 &check_address_exists,
3668 if (caec.exists == GNUNET_YES)
3670 /* During validation attempts we will likely trigger the other
3671 peer trying to validate our address which in turn will cause
3672 it to send us its HELLO, so we expect to hit this case rather
3673 frequently. Only print something if we are very verbose. */
3674 #if DEBUG_TRANSPORT > 1
3675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3676 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3677 a2s (tname, addr, addrlen),
3681 GNUNET_STATISTICS_update (stats,
3682 gettext_noop ("# peer addresses not validated (in progress)"),
3687 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3690 va->transport_name = GNUNET_strdup (tname);
3691 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3693 va->send_time = GNUNET_TIME_absolute_get();
3694 va->addr = (const void*) &va[1];
3695 memcpy (&va[1], addr, addrlen);
3696 va->addrlen = addrlen;
3697 GNUNET_HELLO_get_key (chvc->hello,
3699 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3700 HELLO_VERIFICATION_TIMEOUT,
3701 &timeout_hello_validation,
3703 GNUNET_CONTAINER_multihashmap_put (validation_map,
3706 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3707 setup_peer_check_blacklist (&id, GNUNET_NO,
3708 &transmit_hello_and_ping,
3715 * Check if addresses in validated hello "h" overlap with
3716 * those in "chvc->hello" and validate the rest.
3718 * @param cls closure
3719 * @param peer id of the peer, NULL for last call
3720 * @param h hello message for the peer (can be NULL)
3721 * @param trust amount of trust we have in the peer (not used)
3724 check_hello_validated (void *cls,
3725 const struct GNUNET_PeerIdentity *peer,
3726 const struct GNUNET_HELLO_Message *h,
3729 struct CheckHelloValidatedContext *chvc = cls;
3730 struct GNUNET_HELLO_Message *plain_hello;
3731 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3732 struct GNUNET_PeerIdentity target;
3733 struct NeighbourList *n;
3739 if (GNUNET_NO == chvc->hello_known)
3741 /* notify PEERINFO about the peer now, so that we at least
3742 have the public key if some other component needs it */
3743 GNUNET_HELLO_get_key (chvc->hello, &pk);
3744 GNUNET_CRYPTO_hash (&pk,
3745 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3746 &target.hashPubKey);
3747 plain_hello = GNUNET_HELLO_create (&pk,
3750 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
3751 GNUNET_free (plain_hello);
3753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3754 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
3756 GNUNET_i2s (&target));
3758 GNUNET_STATISTICS_update (stats,
3759 gettext_noop ("# new HELLOs requiring full validation"),
3762 GNUNET_HELLO_iterate_addresses (chvc->hello,
3769 GNUNET_STATISTICS_update (stats,
3770 gettext_noop ("# duplicate HELLO (peer known)"),
3775 if (chvc->ve_count == 0)
3777 GNUNET_CONTAINER_DLL_remove (chvc_head,
3787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3788 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
3792 chvc->hello_known = GNUNET_YES;
3793 n = find_neighbour (peer);
3796 GNUNET_HELLO_iterate_addresses (h,
3798 &add_to_foreign_address_list,
3800 try_transmission_to_peer (n);
3804 GNUNET_STATISTICS_update (stats,
3805 gettext_noop ("# no existing neighbour record (validating HELLO)"),
3809 GNUNET_STATISTICS_update (stats,
3810 gettext_noop ("# HELLO validations (update case)"),
3814 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
3816 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
3824 * Process HELLO-message.
3826 * @param plugin transport involved, may be NULL
3827 * @param message the actual message
3828 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
3831 process_hello (struct TransportPlugin *plugin,
3832 const struct GNUNET_MessageHeader *message)
3835 struct GNUNET_PeerIdentity target;
3836 const struct GNUNET_HELLO_Message *hello;
3837 struct CheckHelloValidatedContext *chvc;
3838 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
3840 hsize = ntohs (message->size);
3841 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
3842 (hsize < sizeof (struct GNUNET_MessageHeader)))
3845 return GNUNET_SYSERR;
3847 GNUNET_STATISTICS_update (stats,
3848 gettext_noop ("# HELLOs received for validation"),
3851 /* first, check if load is too high */
3852 if (GNUNET_SCHEDULER_get_load (sched,
3853 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
3855 GNUNET_STATISTICS_update (stats,
3856 gettext_noop ("# HELLOs ignored due to high load"),
3861 hello = (const struct GNUNET_HELLO_Message *) message;
3862 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
3864 GNUNET_break_op (0);
3865 return GNUNET_SYSERR;
3867 GNUNET_CRYPTO_hash (&publicKey,
3868 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3869 &target.hashPubKey);
3870 if (0 == memcmp (&my_identity,
3872 sizeof (struct GNUNET_PeerIdentity)))
3874 GNUNET_STATISTICS_update (stats,
3875 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
3881 while (NULL != chvc)
3883 if (GNUNET_HELLO_equals (hello,
3885 GNUNET_TIME_absolute_get ()).value > 0)
3888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3889 "Received duplicate `%s' message for `%4s'; ignored\n",
3891 GNUNET_i2s (&target));
3893 return GNUNET_OK; /* validation already pending */
3895 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
3896 GNUNET_break (0 != memcmp (hello, chvc->hello,
3897 GNUNET_HELLO_size(hello)));
3901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3902 "Starting validation of `%s' message for `%4s' of size %u\n",
3904 GNUNET_i2s (&target),
3905 GNUNET_HELLO_size(hello));
3907 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
3908 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
3909 memcpy (&chvc[1], hello, hsize);
3910 GNUNET_CONTAINER_DLL_insert (chvc_head,
3913 /* finally, check if HELLO was previously validated
3914 (continuation will then schedule actual validation) */
3915 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
3918 HELLO_VERIFICATION_TIMEOUT,
3919 &check_hello_validated, chvc);
3925 * The peer specified by the given neighbour has timed-out or a plugin
3926 * has disconnected. We may either need to do nothing (other plugins
3927 * still up), or trigger a full disconnect and clean up. This
3928 * function updates our state and does the necessary notifications.
3929 * Also notifies our clients that the neighbour is now officially
3932 * @param n the neighbour list entry for the peer
3933 * @param check should we just check if all plugins
3934 * disconnected or must we ask all plugins to
3938 disconnect_neighbour (struct NeighbourList *n, int check)
3940 struct ReadyList *rpos;
3941 struct NeighbourList *npos;
3942 struct NeighbourList *nprev;
3943 struct MessageQueue *mq;
3944 struct ForeignAddressList *peer_addresses;
3945 struct ForeignAddressList *peer_pos;
3947 if (GNUNET_YES == check)
3950 while (NULL != rpos)
3952 peer_addresses = rpos->addresses;
3953 while (peer_addresses != NULL)
3955 if (GNUNET_YES == peer_addresses->connected)
3956 return; /* still connected */
3957 peer_addresses = peer_addresses->next;
3963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3964 "Disconnecting from `%4s'\n",
3965 GNUNET_i2s (&n->id));
3967 /* remove n from neighbours list */
3970 while ((npos != NULL) && (npos != n))
3975 GNUNET_assert (npos != NULL);
3977 neighbours = n->next;
3979 nprev->next = n->next;
3981 /* notify all clients about disconnect */
3982 if (GNUNET_YES == n->received_pong)
3983 notify_clients_disconnect (&n->id);
3985 /* clean up all plugins, cancel connections and pending transmissions */
3986 while (NULL != (rpos = n->plugins))
3988 n->plugins = rpos->next;
3989 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
3990 while (rpos->addresses != NULL)
3992 peer_pos = rpos->addresses;
3993 rpos->addresses = peer_pos->next;
3994 if (peer_pos->connected == GNUNET_YES)
3995 GNUNET_STATISTICS_update (stats,
3996 gettext_noop ("# connected addresses"),
3999 if (GNUNET_YES == peer_pos->validated)
4000 GNUNET_STATISTICS_update (stats,
4001 gettext_noop ("# peer addresses considered valid"),
4004 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4006 GNUNET_SCHEDULER_cancel (sched,
4007 peer_pos->revalidate_task);
4008 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4010 GNUNET_free(peer_pos);
4015 /* free all messages on the queue */
4016 while (NULL != (mq = n->messages_head))
4018 GNUNET_STATISTICS_update (stats,
4019 gettext_noop ("# bytes in message queue for other peers"),
4020 - (int64_t) mq->message_buf_size,
4022 GNUNET_STATISTICS_update (stats,
4023 gettext_noop ("# bytes discarded due to disconnect"),
4024 mq->message_buf_size,
4026 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4029 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4031 sizeof(struct GNUNET_PeerIdentity)));
4034 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4036 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
4037 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4039 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4041 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
4042 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4044 if (n->piter != NULL)
4046 GNUNET_PEERINFO_iterate_cancel (n->piter);
4049 /* finally, free n itself */
4050 GNUNET_STATISTICS_update (stats,
4051 gettext_noop ("# active neighbours"),
4054 GNUNET_free_non_null (n->pre_connect_message_buffer);
4060 * We have received a PING message from someone. Need to send a PONG message
4061 * in response to the peer by any means necessary.
4064 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4065 const struct GNUNET_PeerIdentity *peer,
4066 const char *sender_address,
4067 uint16_t sender_address_len)
4069 struct TransportPlugin *plugin = cls;
4070 struct TransportPingMessage *ping;
4071 struct TransportPongMessage *pong;
4072 struct NeighbourList *n;
4073 struct ReadyList *rl;
4074 struct ForeignAddressList *fal;
4076 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
4078 GNUNET_break_op (0);
4079 return GNUNET_SYSERR;
4082 ping = (struct TransportPingMessage *) message;
4083 if (0 != memcmp (&ping->target,
4084 plugin->env.my_identity,
4085 sizeof (struct GNUNET_PeerIdentity)))
4087 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4088 _("Received `%s' message not destined for me!\n"),
4090 return GNUNET_SYSERR;
4093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4094 "Processing `%s' from `%s'\n",
4096 (sender_address != NULL)
4097 ? a2s (plugin->short_name,
4098 (const struct sockaddr *)sender_address,
4102 GNUNET_STATISTICS_update (stats,
4103 gettext_noop ("# PING messages received"),
4106 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
4107 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
4108 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4109 pong->purpose.size =
4110 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4112 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
4113 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING);
4114 pong->challenge = ping->challenge;
4115 pong->addrlen = htons(sender_address_len);
4116 memcpy(&pong->signer,
4118 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
4119 if (sender_address != NULL)
4120 memcpy (&pong[1], sender_address, sender_address_len);
4122 GNUNET_assert (GNUNET_OK ==
4123 GNUNET_CRYPTO_rsa_sign (my_private_key,
4124 &pong->purpose, &pong->signature));
4126 n = find_neighbour(peer);
4127 GNUNET_assert (n != NULL);
4128 /* first try reliable response transmission */
4132 fal = rl->addresses;
4135 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4138 ntohs (pong->header.size),
4139 TRANSPORT_PONG_PRIORITY,
4140 HELLO_VERIFICATION_TIMEOUT,
4148 GNUNET_STATISTICS_update (stats,
4149 gettext_noop ("# PONGs unicast via reliable transport"),
4159 /* no reliable method found, do multicast */
4160 GNUNET_STATISTICS_update (stats,
4161 gettext_noop ("# PONGs multicast to all available addresses"),
4167 fal = rl->addresses;
4170 transmit_to_peer(NULL, fal,
4171 TRANSPORT_PONG_PRIORITY,
4172 HELLO_VERIFICATION_TIMEOUT,
4174 ntohs(pong->header.size),
4187 * Function called by the plugin for each received message.
4188 * Update data volumes, possibly notify plugins about
4189 * reducing the rate at which they read from the socket
4190 * and generally forward to our receive callback.
4192 * @param cls the "struct TransportPlugin *" we gave to the plugin
4193 * @param peer (claimed) identity of the other peer
4194 * @param message the message, NULL if we only care about
4195 * learning about the delay until we should receive again
4196 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4197 * @param session identifier used for this session (can be NULL)
4198 * @param sender_address binary address of the sender (if observed)
4199 * @param sender_address_len number of bytes in sender_address
4200 * @return how long the plugin should wait until receiving more data
4201 * (plugins that do not support this, can ignore the return value)
4203 static struct GNUNET_TIME_Relative
4204 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4205 const struct GNUNET_MessageHeader *message,
4207 struct Session *session,
4208 const char *sender_address,
4209 uint16_t sender_address_len)
4211 struct TransportPlugin *plugin = cls;
4212 struct ReadyList *service_context;
4213 struct ForeignAddressList *peer_address;
4215 struct NeighbourList *n;
4216 struct GNUNET_TIME_Relative ret;
4218 if (is_blacklisted (peer, plugin))
4219 return GNUNET_TIME_UNIT_FOREVER_REL;
4221 n = find_neighbour (peer);
4223 n = setup_new_neighbour (peer, GNUNET_YES);
4224 service_context = n->plugins;
4225 while ((service_context != NULL) && (plugin != service_context->plugin))
4226 service_context = service_context->next;
4227 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4228 peer_address = NULL;
4229 if (message != NULL)
4231 if ( (session != NULL) ||
4232 (sender_address != NULL) )
4233 peer_address = add_peer_address (n,
4237 sender_address_len);
4238 if (peer_address != NULL)
4240 peer_address->distance = distance;
4241 if (GNUNET_YES == peer_address->validated)
4242 mark_address_connected (peer_address);
4243 peer_address->timeout
4245 GNUNET_TIME_relative_to_absolute
4246 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4247 schedule_next_ping (peer_address);
4249 /* update traffic received amount ... */
4250 msize = ntohs (message->size);
4251 GNUNET_STATISTICS_update (stats,
4252 gettext_noop ("# bytes received from other peers"),
4255 n->distance = distance;
4257 GNUNET_TIME_relative_to_absolute
4258 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4259 GNUNET_SCHEDULER_cancel (sched,
4262 GNUNET_SCHEDULER_add_delayed (sched,
4263 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4264 &neighbour_timeout_task, n);
4265 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4267 /* dropping message due to frequent inbound volume violations! */
4268 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4269 GNUNET_ERROR_TYPE_BULK,
4271 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4272 n->in_tracker.available_bytes_per_s__,
4273 n->quota_violation_count);
4274 GNUNET_STATISTICS_update (stats,
4275 gettext_noop ("# bandwidth quota violations by other peers"),
4278 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4282 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4283 ntohs (message->type),
4284 ntohs (message->size),
4287 switch (ntohs (message->type))
4289 case GNUNET_MESSAGE_TYPE_HELLO:
4290 GNUNET_STATISTICS_update (stats,
4291 gettext_noop ("# HELLO messages received from other peers"),
4294 process_hello (plugin, message);
4296 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4297 handle_ping (plugin, message, peer, sender_address, sender_address_len);
4299 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4300 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4303 handle_payload_message (message, n);
4307 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4310 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4311 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4312 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4313 (unsigned int) n->in_tracker.available_bytes_per_s__,
4314 (unsigned long long) ret.value);
4315 GNUNET_STATISTICS_update (stats,
4316 gettext_noop ("# ms throttling suggested"),
4317 (int64_t) ret.value,
4324 * Handle START-message. This is the first message sent to us
4325 * by any client which causes us to add it to our list.
4327 * @param cls closure (always NULL)
4328 * @param client identification of the client
4329 * @param message the actual message
4332 handle_start (void *cls,
4333 struct GNUNET_SERVER_Client *client,
4334 const struct GNUNET_MessageHeader *message)
4336 struct TransportClient *c;
4337 struct ConnectInfoMessage cim;
4338 struct NeighbourList *n;
4341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4342 "Received `%s' request from client\n", "START");
4347 if (c->client == client)
4349 /* client already on our list! */
4351 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4356 c = GNUNET_malloc (sizeof (struct TransportClient));
4360 if (our_hello != NULL)
4363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4364 "Sending our own `%s' to new client\n", "HELLO");
4366 transmit_to_client (c,
4367 (const struct GNUNET_MessageHeader *) our_hello,
4369 /* tell new client about all existing connections */
4370 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4371 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4375 if (GNUNET_YES == n->received_pong)
4378 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4379 cim.distance = htonl (n->distance);
4380 transmit_to_client (c, &cim.header, GNUNET_NO);
4385 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4390 * Handle HELLO-message.
4392 * @param cls closure (always NULL)
4393 * @param client identification of the client
4394 * @param message the actual message
4397 handle_hello (void *cls,
4398 struct GNUNET_SERVER_Client *client,
4399 const struct GNUNET_MessageHeader *message)
4403 GNUNET_STATISTICS_update (stats,
4404 gettext_noop ("# HELLOs received from clients"),
4407 ret = process_hello (NULL, message);
4408 GNUNET_SERVER_receive_done (client, ret);
4413 * Closure for 'transmit_client_message'; followed by
4414 * 'msize' bytes of the actual message.
4416 struct TransmitClientMessageContext
4419 * Client on whom's behalf we are sending.
4421 struct GNUNET_SERVER_Client *client;
4424 * Timeout for the transmission.
4426 struct GNUNET_TIME_Absolute timeout;
4434 * Size of the message in bytes.
4441 * Schedule transmission of a message we got from a client to a peer.
4443 * @param cls the 'struct TransmitClientMessageContext*'
4444 * @param n destination, or NULL on error (in that case, drop the message)
4447 transmit_client_message (void *cls,
4448 struct NeighbourList *n)
4450 struct TransmitClientMessageContext *tcmc = cls;
4451 struct TransportClient *tc;
4454 while ((tc != NULL) && (tc->client != tcmc->client))
4459 transmit_to_peer (tc, NULL, tcmc->priority,
4460 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4462 tcmc->msize, GNUNET_NO, n);
4464 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4465 GNUNET_SERVER_client_drop (tcmc->client);
4471 * Handle SEND-message.
4473 * @param cls closure (always NULL)
4474 * @param client identification of the client
4475 * @param message the actual message
4478 handle_send (void *cls,
4479 struct GNUNET_SERVER_Client *client,
4480 const struct GNUNET_MessageHeader *message)
4482 const struct OutboundMessage *obm;
4483 const struct GNUNET_MessageHeader *obmm;
4484 struct TransmitClientMessageContext *tcmc;
4488 size = ntohs (message->size);
4490 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4493 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4496 GNUNET_STATISTICS_update (stats,
4497 gettext_noop ("# payload received for other peers"),
4500 obm = (const struct OutboundMessage *) message;
4501 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4502 msize = size - sizeof (struct OutboundMessage);
4504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4505 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4506 "SEND", GNUNET_i2s (&obm->peer),
4510 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4511 tcmc->client = client;
4512 tcmc->priority = ntohl (obm->priority);
4513 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4514 tcmc->msize = msize;
4515 memcpy (&tcmc[1], obmm, msize);
4516 GNUNET_SERVER_client_keep (client);
4517 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4518 &transmit_client_message,
4524 * Handle SET_QUOTA-message.
4526 * @param cls closure (always NULL)
4527 * @param client identification of the client
4528 * @param message the actual message
4531 handle_set_quota (void *cls,
4532 struct GNUNET_SERVER_Client *client,
4533 const struct GNUNET_MessageHeader *message)
4535 const struct QuotaSetMessage *qsm =
4536 (const struct QuotaSetMessage *) message;
4537 struct NeighbourList *n;
4539 GNUNET_STATISTICS_update (stats,
4540 gettext_noop ("# SET QUOTA messages received"),
4543 n = find_neighbour (&qsm->peer);
4546 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4547 GNUNET_STATISTICS_update (stats,
4548 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
4554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4555 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
4557 (unsigned int) ntohl (qsm->quota.value__),
4558 (unsigned int) n->in_tracker.available_bytes_per_s__,
4559 GNUNET_i2s (&qsm->peer));
4561 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
4563 if (0 == ntohl (qsm->quota.value__))
4564 disconnect_neighbour (n, GNUNET_NO);
4565 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4570 * Take the given address and append it to the set of results send back to
4573 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
4574 * @param address the resolved name, NULL to indicate the last response
4577 transmit_address_to_client (void *cls, const char *address)
4579 struct GNUNET_SERVER_TransmitContext *tc = cls;
4582 if (NULL == address)
4585 slen = strlen (address) + 1;
4586 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
4587 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4588 if (NULL == address)
4589 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
4594 * Handle AddressLookup-message.
4596 * @param cls closure (always NULL)
4597 * @param client identification of the client
4598 * @param message the actual message
4601 handle_address_lookup (void *cls,
4602 struct GNUNET_SERVER_Client *client,
4603 const struct GNUNET_MessageHeader *message)
4605 const struct AddressLookupMessage *alum;
4606 struct TransportPlugin *lsPlugin;
4607 const char *nameTransport;
4608 const char *address;
4610 struct GNUNET_SERVER_TransmitContext *tc;
4611 struct GNUNET_TIME_Absolute timeout;
4612 struct GNUNET_TIME_Relative rtimeout;
4615 size = ntohs (message->size);
4616 if (size < sizeof (struct AddressLookupMessage))
4618 GNUNET_break_op (0);
4619 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4622 alum = (const struct AddressLookupMessage *) message;
4623 uint32_t addressLen = ntohl (alum->addrlen);
4624 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
4626 GNUNET_break_op (0);
4627 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4630 address = (const char *) &alum[1];
4631 nameTransport = (const char *) &address[addressLen];
4633 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
4635 GNUNET_break_op (0);
4636 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4639 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
4640 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
4641 numeric = ntohl (alum->numeric_only);
4642 lsPlugin = find_transport (nameTransport);
4643 if (NULL == lsPlugin)
4645 tc = GNUNET_SERVER_transmit_context_create (client);
4646 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
4647 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4648 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
4651 tc = GNUNET_SERVER_transmit_context_create (client);
4652 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
4654 address, addressLen,
4657 &transmit_address_to_client, tc);
4661 * List of handlers for the messages understood by this
4664 static struct GNUNET_SERVER_MessageHandler handlers[] = {
4665 {&handle_start, NULL,
4666 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
4667 {&handle_hello, NULL,
4668 GNUNET_MESSAGE_TYPE_HELLO, 0},
4669 {&handle_send, NULL,
4670 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
4671 {&handle_set_quota, NULL,
4672 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
4673 {&handle_address_lookup, NULL,
4674 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
4676 {&handle_blacklist_init, NULL,
4677 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
4678 {&handle_blacklist_reply, NULL,
4679 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
4685 * Setup the environment for this plugin.
4688 create_environment (struct TransportPlugin *plug)
4690 plug->env.cfg = cfg;
4691 plug->env.sched = sched;
4692 plug->env.my_identity = &my_identity;
4693 plug->env.cls = plug;
4694 plug->env.receive = &plugin_env_receive;
4695 plug->env.notify_address = &plugin_env_notify_address;
4696 plug->env.session_end = &plugin_env_session_end;
4697 plug->env.max_connections = max_connect_per_transport;
4698 plug->env.stats = stats;
4703 * Start the specified transport (load the plugin).
4706 start_transport (struct GNUNET_SERVER_Handle *server,
4709 struct TransportPlugin *plug;
4712 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4713 _("Loading `%s' transport plugin\n"), name);
4714 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
4715 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
4716 create_environment (plug);
4717 plug->short_name = GNUNET_strdup (name);
4718 plug->lib_name = libname;
4719 plug->next = plugins;
4721 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
4722 if (plug->api == NULL)
4724 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4725 _("Failed to load transport plugin for `%s'\n"), name);
4726 GNUNET_free (plug->short_name);
4727 plugins = plug->next;
4728 GNUNET_free (libname);
4735 * Called whenever a client is disconnected. Frees our
4736 * resources associated with that client.
4738 * @param cls closure
4739 * @param client identification of the client
4742 client_disconnect_notification (void *cls,
4743 struct GNUNET_SERVER_Client *client)
4745 struct TransportClient *pos;
4746 struct TransportClient *prev;
4747 struct ClientMessageQueueEntry *mqe;
4748 struct Blacklisters *bl;
4749 struct BlacklistCheck *bc;
4754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4755 "Client disconnected, cleaning up.\n");
4757 /* clean up blacklister */
4761 if (bl->client == client)
4766 if (bc->bl_pos == bl)
4768 bc->bl_pos = bl->next;
4771 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
4774 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
4775 bc->task = GNUNET_SCHEDULER_add_now (sched,
4776 &do_blacklist_check,
4782 GNUNET_CONTAINER_DLL_remove (bl_head,
4785 GNUNET_SERVER_client_drop (bl->client);
4791 /* clean up 'normal' clients */
4794 while ((pos != NULL) && (pos->client != client))
4801 while (NULL != (mqe = pos->message_queue_head))
4803 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
4804 pos->message_queue_tail,
4806 pos->message_count--;
4810 clients = pos->next;
4812 prev->next = pos->next;
4813 if (GNUNET_YES == pos->tcs_pending)
4818 if (pos->th != NULL)
4820 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
4823 GNUNET_break (0 == pos->message_count);
4829 * Function called when the service shuts down. Unloads our plugins
4830 * and cancels pending validations.
4832 * @param cls closure, unused
4833 * @param tc task context (unused)
4836 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4838 struct TransportPlugin *plug;
4839 struct OwnAddressList *al;
4840 struct CheckHelloValidatedContext *chvc;
4842 while (neighbours != NULL)
4843 disconnect_neighbour (neighbours, GNUNET_NO);
4845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4846 "Transport service is unloading plugins...\n");
4848 while (NULL != (plug = plugins))
4850 plugins = plug->next;
4851 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
4853 GNUNET_SCHEDULER_cancel (plug->env.sched,
4854 plug->address_update_task);
4855 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
4857 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
4858 GNUNET_free (plug->lib_name);
4859 GNUNET_free (plug->short_name);
4860 while (NULL != (al = plug->addresses))
4862 plug->addresses = al->next;
4867 if (my_private_key != NULL)
4868 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4869 GNUNET_free_non_null (our_hello);
4871 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
4874 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4875 validation_map = NULL;
4877 /* free 'chvc' data structure */
4878 while (NULL != (chvc = chvc_head))
4880 chvc_head = chvc->next;
4881 if (chvc->piter != NULL)
4882 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
4885 GNUNET_assert (chvc->ve_count == 0);
4892 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4895 if (peerinfo != NULL)
4897 GNUNET_PEERINFO_disconnect (peerinfo);
4900 /* Can we assume those are gone by now, or do we need to clean up
4902 GNUNET_break (bl_head == NULL);
4903 GNUNET_break (bc_head == NULL);
4908 * Initiate transport service.
4910 * @param cls closure
4911 * @param s scheduler to use
4912 * @param serv the initialized server
4913 * @param c configuration to use
4917 struct GNUNET_SCHEDULER_Handle *s,
4918 struct GNUNET_SERVER_Handle *serv,
4919 const struct GNUNET_CONFIGURATION_Handle *c)
4924 unsigned long long tneigh;
4929 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
4930 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
4931 /* parse configuration */
4933 GNUNET_CONFIGURATION_get_value_number (c,
4938 GNUNET_CONFIGURATION_get_value_filename (c,
4940 "HOSTKEY", &keyfile)))
4942 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4944 ("Transport service is lacking key configuration settings. Exiting.\n"));
4945 GNUNET_SCHEDULER_shutdown (s);
4948 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4951 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4952 validation_map = NULL;
4955 max_connect_per_transport = (uint32_t) tneigh;
4956 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
4957 if (peerinfo == NULL)
4959 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4960 _("Could not access PEERINFO service. Exiting.\n"));
4961 GNUNET_SCHEDULER_shutdown (s);
4964 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4967 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4968 validation_map = NULL;
4969 GNUNET_free (keyfile);
4972 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4973 GNUNET_free (keyfile);
4974 if (my_private_key == NULL)
4976 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4978 ("Transport service could not access hostkey. Exiting.\n"));
4979 GNUNET_SCHEDULER_shutdown (s);
4982 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4985 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4986 validation_map = NULL;
4989 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4990 GNUNET_CRYPTO_hash (&my_public_key,
4991 sizeof (my_public_key), &my_identity.hashPubKey);
4992 /* setup notification */
4994 GNUNET_SERVER_disconnect_notify (server,
4995 &client_disconnect_notification, NULL);
4996 /* load plugins... */
4999 GNUNET_CONFIGURATION_get_value_string (c,
5000 "TRANSPORT", "PLUGINS", &plugs))
5002 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5003 _("Starting transport plugins `%s'\n"), plugs);
5004 pos = strtok (plugs, " ");
5007 start_transport (server, pos);
5009 pos = strtok (NULL, " ");
5011 GNUNET_free (plugs);
5013 GNUNET_SCHEDULER_add_delayed (sched,
5014 GNUNET_TIME_UNIT_FOREVER_REL,
5015 &shutdown_task, NULL);
5020 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5022 /* If we have a blacklist file, read from it */
5023 read_blacklist_file(cfg);
5024 /* process client requests */
5025 GNUNET_SERVER_add_handlers (server, handlers);
5030 * The main function for the transport service.
5032 * @param argc number of arguments from the command line
5033 * @param argv command line arguments
5034 * @return 0 ok, 1 on error
5037 main (int argc, char *const *argv)
5039 a2s (NULL, NULL, 0); /* make compiler happy */
5040 return (GNUNET_OK ==
5041 GNUNET_SERVICE_run (argc,
5044 GNUNET_SERVICE_OPTION_NONE,
5045 &run, NULL)) ? 0 : 1;
5048 /* end of gnunet-service-transport.c */