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;
810 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
815 static struct GNUNET_PeerIdentity my_identity;
820 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
825 struct GNUNET_SCHEDULER_Handle *sched;
830 const struct GNUNET_CONFIGURATION_Handle *cfg;
833 * Linked list of all clients to this service.
835 static struct TransportClient *clients;
838 * All loaded plugins.
840 static struct TransportPlugin *plugins;
843 * Handle to peerinfo service.
845 static struct GNUNET_PEERINFO_Handle *peerinfo;
848 * All known neighbours and their HELLOs.
850 static struct NeighbourList *neighbours;
853 * Number of neighbours we'd like to have.
855 static uint32_t max_connect_per_transport;
858 * Head of linked list.
860 static struct CheckHelloValidatedContext *chvc_head;
863 * Tail of linked list.
865 static struct CheckHelloValidatedContext *chvc_tail;
868 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
869 * of the given peer that we are currently validating).
871 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
874 * Handle for reporting statistics.
876 static struct GNUNET_STATISTICS_Handle *stats;
880 * The peer specified by the given neighbour has timed-out or a plugin
881 * has disconnected. We may either need to do nothing (other plugins
882 * still up), or trigger a full disconnect and clean up. This
883 * function updates our state and do the necessary notifications.
884 * Also notifies our clients that the neighbour is now officially
887 * @param n the neighbour list entry for the peer
888 * @param check should we just check if all plugins
889 * disconnected or must we ask all plugins to
892 static void disconnect_neighbour (struct NeighbourList *n, int check);
895 * Check the ready list for the given neighbour and if a plugin is
896 * ready for transmission (and if we have a message), do so!
898 * @param neighbour target peer for which to transmit
900 static void try_transmission_to_peer (struct NeighbourList *neighbour);
904 * Find an entry in the neighbour list for a particular peer.
906 * @return NULL if not found.
908 static struct NeighbourList *
909 find_neighbour (const struct GNUNET_PeerIdentity *key)
911 struct NeighbourList *head = neighbours;
913 while ((head != NULL) &&
914 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
921 * Find an entry in the transport list for a particular transport.
923 * @return NULL if not found.
925 static struct TransportPlugin *
926 find_transport (const char *short_name)
928 struct TransportPlugin *head = plugins;
929 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
935 * Is a particular peer blacklisted for a particular transport?
937 * @param peer the peer to check for
938 * @param plugin the plugin used to connect to the peer
940 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
943 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
946 if (plugin->blacklist != NULL)
948 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 _("Peer `%s:%s' is blacklisted!\n"),
953 plugin->short_name, GNUNET_i2s (peer));
964 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
966 struct TransportPlugin *plugin;
968 plugin = find_transport(transport_name);
969 if (plugin == NULL) /* Nothing to do */
971 if (plugin->blacklist == NULL)
972 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
973 GNUNET_assert(plugin->blacklist != NULL);
974 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
976 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
981 * Read the blacklist file, containing transport:peer entries.
982 * Provided the transport is loaded, set up hashmap with these
983 * entries to blacklist peers by transport.
987 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
994 struct GNUNET_PeerIdentity pid;
996 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
997 unsigned int entries_found;
998 char *transport_name;
1001 GNUNET_CONFIGURATION_get_value_filename (cfg,
1007 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1008 _("Option `%s' in section `%s' not specified!\n"),
1014 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1015 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1016 | GNUNET_DISK_PERM_USER_WRITE);
1017 if (0 != STAT (fn, &frstat))
1019 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1020 _("Could not read blacklist file `%s'\n"), fn);
1024 if (frstat.st_size == 0)
1026 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1027 _("Blacklist file `%s' is empty.\n"),
1032 /* FIXME: use mmap */
1033 data = GNUNET_malloc_large (frstat.st_size);
1034 GNUNET_assert(data != NULL);
1035 if (frstat.st_size !=
1036 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1038 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1039 _("Failed to read blacklist from `%s'\n"), fn);
1046 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1048 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1049 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1052 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1055 if (colon_pos >= frstat.st_size)
1057 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1058 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1059 (unsigned long long) colon_pos);
1065 if (isspace( (unsigned char) data[colon_pos]))
1067 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1068 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1069 (unsigned long long) colon_pos);
1071 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1075 tsize = colon_pos - pos;
1076 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1078 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1079 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1080 (unsigned long long) colon_pos);
1086 transport_name = GNUNET_malloc(tsize);
1087 memcpy(transport_name, &data[pos], tsize);
1088 pos = colon_pos + 1;
1091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1092 _("Read transport name %s in blacklist file.\n"),
1095 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1096 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1098 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1099 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1100 (unsigned long long) pos);
1102 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1104 GNUNET_free_non_null(transport_name);
1107 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1108 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1110 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1111 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1112 (unsigned long long) pos,
1117 if (0 != memcmp (&pid,
1119 sizeof (struct GNUNET_PeerIdentity)))
1122 add_peer_to_blacklist (&pid,
1124 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1125 _("Found blacklisted peer `%s:%s' in configuration\n"),
1126 transport_name, GNUNET_i2s (&pid));
1130 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1131 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1135 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1136 GNUNET_free_non_null(transport_name);
1137 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1146 * Function called to notify a client about the socket being ready to
1147 * queue more data. "buf" will be NULL and "size" zero if the socket
1148 * was closed for writing in the meantime.
1150 * @param cls closure
1151 * @param size number of bytes available in buf
1152 * @param buf where the callee should write the message
1153 * @return number of bytes written to buf
1156 transmit_to_client_callback (void *cls, size_t size, void *buf)
1158 struct TransportClient *client = cls;
1159 struct ClientMessageQueueEntry *q;
1162 const struct GNUNET_MessageHeader *msg;
1168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1169 "Transmission to client failed, closing connection.\n");
1170 /* fatal error with client, free message queue! */
1171 while (NULL != (q = client->message_queue_head))
1173 GNUNET_STATISTICS_update (stats,
1174 gettext_noop ("# bytes discarded (could not transmit to client)"),
1175 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1177 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1178 client->message_queue_tail,
1182 client->message_count = 0;
1187 while (NULL != (q = client->message_queue_head))
1189 msg = (const struct GNUNET_MessageHeader *) &q[1];
1190 msize = ntohs (msg->size);
1191 if (msize + tsize > size)
1194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1195 "Transmitting message of type %u to client.\n",
1198 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1199 client->message_queue_tail,
1201 memcpy (&cbuf[tsize], msg, msize);
1204 client->message_count--;
1208 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1209 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1211 GNUNET_TIME_UNIT_FOREVER_REL,
1212 &transmit_to_client_callback,
1214 GNUNET_assert (client->th != NULL);
1221 * Convert an address to a string.
1223 * @param plugin name of the plugin responsible for the address
1224 * @param addr binary address
1225 * @param addr_len number of bytes in addr
1226 * @return NULL on error, otherwise address string
1229 a2s (const char *plugin,
1233 struct TransportPlugin *p;
1237 p = find_transport (plugin);
1240 return p->api->address_to_string (p->api->cls,
1247 * Mark the given FAL entry as 'connected' (and hence preferred for
1248 * sending); also mark all others for the same peer as 'not connected'
1249 * (since only one can be preferred).
1251 * @param fal address to set to 'connected'
1254 mark_address_connected (struct ForeignAddressList *fal)
1256 struct ForeignAddressList *pos;
1259 GNUNET_assert (GNUNET_YES == fal->validated);
1260 if (fal->connected == GNUNET_YES)
1261 return; /* nothing to do */
1263 pos = fal->ready_list->addresses;
1266 if (GNUNET_YES == pos->connected)
1269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1270 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1271 a2s (pos->ready_list->plugin->short_name,
1275 GNUNET_break (cnt == GNUNET_YES);
1277 pos->connected = GNUNET_NO;
1278 GNUNET_STATISTICS_update (stats,
1279 gettext_noop ("# connected addresses"),
1285 fal->connected = GNUNET_YES;
1286 if (GNUNET_YES == cnt)
1288 GNUNET_STATISTICS_update (stats,
1289 gettext_noop ("# connected addresses"),
1297 * Send the specified message to the specified client. Since multiple
1298 * messages may be pending for the same client at a time, this code
1299 * makes sure that no message is lost.
1301 * @param client client to transmit the message to
1302 * @param msg the message to send
1303 * @param may_drop can this message be dropped if the
1304 * message queue for this client is getting far too large?
1307 transmit_to_client (struct TransportClient *client,
1308 const struct GNUNET_MessageHeader *msg, int may_drop)
1310 struct ClientMessageQueueEntry *q;
1313 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1315 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1317 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1320 client->message_count,
1322 GNUNET_STATISTICS_update (stats,
1323 gettext_noop ("# messages dropped due to slow client"),
1328 msize = ntohs (msg->size);
1329 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1330 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1331 memcpy (&q[1], msg, msize);
1332 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1333 client->message_queue_tail,
1334 client->message_queue_tail,
1336 client->message_count++;
1337 if (client->th == NULL)
1339 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1341 GNUNET_TIME_UNIT_FOREVER_REL,
1342 &transmit_to_client_callback,
1344 GNUNET_assert (client->th != NULL);
1350 * Transmit a 'SEND_OK' notification to the given client for the
1353 * @param client who to notify
1354 * @param n neighbour to notify about
1355 * @param result status code for the transmission request
1358 transmit_send_ok (struct TransportClient *client,
1359 struct NeighbourList *n,
1362 struct SendOkMessage send_ok_msg;
1364 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1365 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1366 send_ok_msg.success = htonl (result);
1367 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1368 send_ok_msg.peer = n->id;
1369 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1374 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1375 * upon "completion" of a send request. This tells the API
1376 * that it is now legal to send another message to the given
1379 * @param cls closure, identifies the entry on the
1380 * message queue that was transmitted and the
1381 * client responsible for queueing the message
1382 * @param target the peer receiving the message
1383 * @param result GNUNET_OK on success, if the transmission
1384 * failed, we should not tell the client to transmit
1388 transmit_send_continuation (void *cls,
1389 const struct GNUNET_PeerIdentity *target,
1392 struct MessageQueue *mq = cls;
1393 struct NeighbourList *n;
1395 GNUNET_STATISTICS_update (stats,
1396 gettext_noop ("# bytes pending with plugins"),
1397 - (int64_t) mq->message_buf_size,
1399 if (result == GNUNET_OK)
1401 GNUNET_STATISTICS_update (stats,
1402 gettext_noop ("# bytes successfully transmitted by plugins"),
1403 mq->message_buf_size,
1408 GNUNET_STATISTICS_update (stats,
1409 gettext_noop ("# bytes with transmission failure by plugins"),
1410 mq->message_buf_size,
1413 n = find_neighbour(&mq->neighbour_id);
1414 GNUNET_assert (n != NULL);
1415 if (mq->specific_address != NULL)
1417 if (result == GNUNET_OK)
1419 mq->specific_address->timeout =
1420 GNUNET_TIME_relative_to_absolute
1421 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1422 if (mq->specific_address->validated == GNUNET_YES)
1423 mark_address_connected (mq->specific_address);
1427 if (mq->specific_address->connected != GNUNET_NO)
1430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1431 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1432 a2s (mq->specific_address->ready_list->plugin->short_name,
1433 mq->specific_address->addr,
1434 mq->specific_address->addrlen));
1436 GNUNET_STATISTICS_update (stats,
1437 gettext_noop ("# connected addresses"),
1440 mq->specific_address->connected = GNUNET_NO;
1443 if (! mq->internal_msg)
1444 mq->specific_address->in_transmit = GNUNET_NO;
1446 if (mq->client != NULL)
1447 transmit_send_ok (mq->client, n, result);
1449 try_transmission_to_peer (n);
1454 * Find an address in any of the available transports for
1455 * the given neighbour that would be good for message
1456 * transmission. This is essentially the transport selection
1459 * @param neighbour for whom to select an address
1460 * @return selected address, NULL if we have none
1462 struct ForeignAddressList *
1463 find_ready_address(struct NeighbourList *neighbour)
1465 struct ReadyList *head = neighbour->plugins;
1466 struct ForeignAddressList *addresses;
1467 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1468 struct ForeignAddressList *best_address;
1470 best_address = NULL;
1471 while (head != NULL)
1473 addresses = head->addresses;
1474 while (addresses != NULL)
1476 if ( (addresses->timeout.value < now.value) &&
1477 (addresses->connected == GNUNET_YES) )
1480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1481 "Marking long-time inactive connection to `%4s' as down.\n",
1482 GNUNET_i2s (&neighbour->id));
1484 GNUNET_STATISTICS_update (stats,
1485 gettext_noop ("# connected addresses"),
1488 addresses->connected = GNUNET_NO;
1490 addresses = addresses->next;
1493 addresses = head->addresses;
1494 while (addresses != NULL)
1496 #if DEBUG_TRANSPORT > 1
1497 if (addresses->addr != NULL)
1498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1499 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1500 a2s (head->plugin->short_name,
1502 addresses->addrlen),
1503 GNUNET_i2s (&neighbour->id),
1504 addresses->connected,
1505 addresses->in_transmit,
1506 addresses->validated,
1507 addresses->connect_attempts,
1508 (unsigned long long) addresses->timeout.value,
1509 (unsigned int) addresses->distance);
1511 if ( ( (best_address == NULL) ||
1512 (addresses->connected == GNUNET_YES) ||
1513 (best_address->connected == GNUNET_NO) ) &&
1514 (addresses->in_transmit == GNUNET_NO) &&
1515 ( (best_address == NULL) ||
1516 (addresses->latency.value < best_address->latency.value)) )
1517 best_address = addresses;
1518 /* FIXME: also give lower-latency addresses that are not
1519 connected a chance some times... */
1520 addresses = addresses->next;
1524 if (best_address != NULL)
1527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1528 "Best address found (`%s') has latency of %llu ms.\n",
1529 a2s (best_address->ready_list->plugin->short_name,
1531 best_address->addrlen),
1532 best_address->latency.value);
1537 GNUNET_STATISTICS_update (stats,
1538 gettext_noop ("# transmission attempts failed (no address)"),
1542 return best_address;
1548 * We should re-try transmitting to the given peer,
1549 * hopefully we've learned something in the meantime.
1552 retry_transmission_task (void *cls,
1553 const struct GNUNET_SCHEDULER_TaskContext *tc)
1555 struct NeighbourList *n = cls;
1557 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1558 try_transmission_to_peer (n);
1563 * Check the ready list for the given neighbour and if a plugin is
1564 * ready for transmission (and if we have a message), do so!
1566 * @param neighbour target peer for which to transmit
1569 try_transmission_to_peer (struct NeighbourList *neighbour)
1571 struct ReadyList *rl;
1572 struct MessageQueue *mq;
1573 struct GNUNET_TIME_Relative timeout;
1577 if (neighbour->messages_head == NULL)
1580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1581 "Transmission queue for `%4s' is empty\n",
1582 GNUNET_i2s (&neighbour->id));
1584 return; /* nothing to do */
1587 mq = neighbour->messages_head;
1588 force_address = GNUNET_YES;
1589 if (mq->specific_address == NULL)
1591 mq->specific_address = find_ready_address(neighbour);
1592 GNUNET_STATISTICS_update (stats,
1593 gettext_noop ("# transport selected peer address freely"),
1596 force_address = GNUNET_NO;
1598 if (mq->specific_address == NULL)
1600 GNUNET_STATISTICS_update (stats,
1601 gettext_noop ("# transport failed to selected peer address"),
1604 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1605 if (timeout.value == 0)
1608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1609 "No destination address available to transmit message of size %u to peer `%4s'\n",
1610 mq->message_buf_size,
1611 GNUNET_i2s (&mq->neighbour_id));
1613 GNUNET_STATISTICS_update (stats,
1614 gettext_noop ("# bytes in message queue for other peers"),
1615 - (int64_t) mq->message_buf_size,
1617 GNUNET_STATISTICS_update (stats,
1618 gettext_noop ("# bytes discarded (no destination address available)"),
1619 mq->message_buf_size,
1621 if (mq->client != NULL)
1622 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1623 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1624 neighbour->messages_tail,
1627 return; /* nobody ready */
1629 GNUNET_STATISTICS_update (stats,
1630 gettext_noop ("# message delivery deferred (no address)"),
1633 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1634 GNUNET_SCHEDULER_cancel (sched,
1635 neighbour->retry_task);
1636 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1638 &retry_transmission_task,
1641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1642 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1643 mq->message_buf_size,
1644 GNUNET_i2s (&mq->neighbour_id),
1647 /* FIXME: might want to trigger peerinfo lookup here
1648 (unless that's already pending...) */
1651 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1652 neighbour->messages_tail,
1654 if (mq->specific_address->connected == GNUNET_NO)
1655 mq->specific_address->connect_attempts++;
1656 rl = mq->specific_address->ready_list;
1657 mq->plugin = rl->plugin;
1658 if (!mq->internal_msg)
1659 mq->specific_address->in_transmit = GNUNET_YES;
1661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1662 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1663 mq->message_buf_size,
1664 GNUNET_i2s (&neighbour->id),
1665 (mq->specific_address->addr != NULL)
1666 ? a2s (mq->plugin->short_name,
1667 mq->specific_address->addr,
1668 mq->specific_address->addrlen)
1670 rl->plugin->short_name);
1672 GNUNET_STATISTICS_update (stats,
1673 gettext_noop ("# bytes in message queue for other peers"),
1674 - (int64_t) mq->message_buf_size,
1676 GNUNET_STATISTICS_update (stats,
1677 gettext_noop ("# bytes pending with plugins"),
1678 mq->message_buf_size,
1680 ret = rl->plugin->api->send (rl->plugin->api->cls,
1683 mq->message_buf_size,
1685 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1686 mq->specific_address->session,
1687 mq->specific_address->addr,
1688 mq->specific_address->addrlen,
1690 &transmit_send_continuation, mq);
1693 /* failure, but 'send' would not call continuation in this case,
1694 so we need to do it here! */
1695 transmit_send_continuation (mq,
1703 * Send the specified message to the specified peer.
1705 * @param client source of the transmission request (can be NULL)
1706 * @param peer_address ForeignAddressList where we should send this message
1707 * @param priority how important is the message
1708 * @param timeout how long do we have to transmit?
1709 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1710 * @param message_buf_size total size of all messages in message_buf
1711 * @param is_internal is this an internal message; these are pre-pended and
1712 * also do not count for plugins being "ready" to transmit
1713 * @param neighbour handle to the neighbour for transmission
1716 transmit_to_peer (struct TransportClient *client,
1717 struct ForeignAddressList *peer_address,
1718 unsigned int priority,
1719 struct GNUNET_TIME_Relative timeout,
1720 const char *message_buf,
1721 size_t message_buf_size,
1722 int is_internal, struct NeighbourList *neighbour)
1724 struct MessageQueue *mq;
1729 /* check for duplicate submission */
1730 mq = neighbour->messages_head;
1733 if (mq->client == client)
1735 /* client transmitted to same peer twice
1736 before getting SEND_OK! */
1744 GNUNET_STATISTICS_update (stats,
1745 gettext_noop ("# bytes in message queue for other peers"),
1748 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1749 mq->specific_address = peer_address;
1750 mq->client = client;
1751 memcpy (&mq[1], message_buf, message_buf_size);
1752 mq->message_buf = (const char*) &mq[1];
1753 mq->message_buf_size = message_buf_size;
1754 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1755 mq->internal_msg = is_internal;
1756 mq->priority = priority;
1757 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1759 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1760 neighbour->messages_tail,
1763 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1764 neighbour->messages_tail,
1765 neighbour->messages_tail,
1767 try_transmission_to_peer (neighbour);
1774 struct GeneratorContext
1776 struct TransportPlugin *plug_pos;
1777 struct OwnAddressList *addr_pos;
1778 struct GNUNET_TIME_Absolute expiration;
1786 address_generator (void *cls, size_t max, void *buf)
1788 struct GeneratorContext *gc = cls;
1791 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1793 gc->plug_pos = gc->plug_pos->next;
1794 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1796 if (NULL == gc->plug_pos)
1801 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1804 gc->addr_pos->addrlen, buf, max);
1805 gc->addr_pos = gc->addr_pos->next;
1811 * Construct our HELLO message from all of the addresses of
1812 * all of the transports.
1817 struct GNUNET_HELLO_Message *hello;
1818 struct TransportClient *cpos;
1819 struct NeighbourList *npos;
1820 struct GeneratorContext gc;
1822 gc.plug_pos = plugins;
1823 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1824 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1825 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1828 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1830 GNUNET_STATISTICS_update (stats,
1831 gettext_noop ("# refreshed my HELLO"),
1835 while (cpos != NULL)
1837 transmit_to_client (cpos,
1838 (const struct GNUNET_MessageHeader *) hello,
1843 GNUNET_free_non_null (our_hello);
1845 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1847 while (npos != NULL)
1850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1851 "Transmitting updated `%s' to neighbour `%4s'\n",
1852 "HELLO", GNUNET_i2s (&npos->id));
1854 GNUNET_STATISTICS_update (stats,
1855 gettext_noop ("# transmitted my HELLO to other peers"),
1858 transmit_to_peer (NULL, NULL, 0,
1859 HELLO_ADDRESS_EXPIRATION,
1860 (const char *) our_hello,
1861 GNUNET_HELLO_size(our_hello),
1869 * Task used to clean up expired addresses for a plugin.
1871 * @param cls closure
1875 expire_address_task (void *cls,
1876 const struct GNUNET_SCHEDULER_TaskContext *tc);
1880 * Update the list of addresses for this plugin,
1881 * expiring those that are past their expiration date.
1883 * @param plugin addresses of which plugin should be recomputed?
1884 * @param fresh set to GNUNET_YES if a new address was added
1885 * and we need to regenerate the HELLO even if nobody
1889 update_addresses (struct TransportPlugin *plugin, int fresh)
1891 static struct GNUNET_TIME_Absolute last_update;
1892 struct GNUNET_TIME_Relative min_remaining;
1893 struct GNUNET_TIME_Relative remaining;
1894 struct GNUNET_TIME_Absolute now;
1895 struct OwnAddressList *pos;
1896 struct OwnAddressList *prev;
1897 struct OwnAddressList *next;
1900 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1901 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1902 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1903 now = GNUNET_TIME_absolute_get ();
1904 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1905 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1907 pos = plugin->addresses;
1911 if (pos->expires.value < now.value)
1913 expired = GNUNET_YES;
1915 plugin->addresses = pos->next;
1917 prev->next = pos->next;
1922 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1923 if (remaining.value < min_remaining.value)
1924 min_remaining = remaining;
1930 if (expired || fresh)
1935 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1936 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1938 plugin->address_update_task
1939 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1941 &expire_address_task, plugin);
1946 * Task used to clean up expired addresses for a plugin.
1948 * @param cls closure
1952 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1954 struct TransportPlugin *plugin = cls;
1956 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1957 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1958 update_addresses (plugin, GNUNET_NO);
1963 * Iterator over hash map entries that NULLs the session of validation
1964 * entries that match the given session.
1966 * @param cls closure (the 'struct Session*' to match against)
1967 * @param key current key code (peer ID, not used)
1968 * @param value value in the hash map ('struct ValidationEntry*')
1969 * @return GNUNET_YES (we should continue to iterate)
1972 remove_session_validations (void *cls,
1973 const GNUNET_HashCode * key,
1976 struct Session *session = cls;
1977 struct ValidationEntry *ve = value;
1979 if (session == ve->session)
1986 * Function that will be called whenever the plugin internally
1987 * cleans up a session pointer and hence the service needs to
1988 * discard all of those sessions as well. Plugins that do not
1989 * use sessions can simply omit calling this function and always
1990 * use NULL wherever a session pointer is needed.
1992 * @param cls closure
1993 * @param peer which peer was the session for
1994 * @param session which session is being destoyed
1997 plugin_env_session_end (void *cls,
1998 const struct GNUNET_PeerIdentity *peer,
1999 struct Session *session)
2001 struct TransportPlugin *p = cls;
2002 struct NeighbourList *nl;
2003 struct ReadyList *rl;
2004 struct ForeignAddressList *pos;
2005 struct ForeignAddressList *prev;
2007 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2008 &remove_session_validations,
2010 nl = find_neighbour (peer);
2016 if (rl->plugin == p)
2023 pos = rl->addresses;
2024 while ( (pos != NULL) &&
2025 (pos->session != session) )
2032 pos->session = NULL;
2033 if (pos->addrlen != 0)
2036 rl->addresses = pos->next;
2038 prev->next = pos->next;
2039 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2041 GNUNET_SCHEDULER_cancel (sched,
2042 pos->revalidate_task);
2043 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2046 if (nl->received_pong == GNUNET_NO)
2047 return; /* nothing to do */
2048 /* check if we have any validated addresses left */
2049 pos = rl->addresses;
2056 /* no valid addresses left, signal disconnect! */
2057 disconnect_neighbour (nl, GNUNET_NO);
2062 * Function that must be called by each plugin to notify the
2063 * transport service about the addresses under which the transport
2064 * provided by the plugin can be reached.
2066 * @param cls closure
2067 * @param name name of the transport that generated the address
2068 * @param addr one of the addresses of the host, NULL for the last address
2069 * the specific address format depends on the transport
2070 * @param addrlen length of the address
2071 * @param expires when should this address automatically expire?
2074 plugin_env_notify_address (void *cls,
2078 struct GNUNET_TIME_Relative expires)
2080 struct TransportPlugin *p = cls;
2081 struct OwnAddressList *al;
2082 struct GNUNET_TIME_Absolute abex;
2084 GNUNET_assert (addr != NULL);
2085 abex = GNUNET_TIME_relative_to_absolute (expires);
2086 GNUNET_assert (p == find_transport (name));
2090 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2092 if (al->expires.value < abex.value)
2099 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2101 al->next = p->addresses;
2104 al->addrlen = addrlen;
2105 memcpy (&al[1], addr, addrlen);
2106 update_addresses (p, GNUNET_YES);
2111 * Notify all of our clients about a peer connecting.
2114 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2115 struct GNUNET_TIME_Relative latency,
2118 struct ConnectInfoMessage cim;
2119 struct TransportClient *cpos;
2122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2123 "Notifying clients about connection from `%s'\n",
2126 GNUNET_STATISTICS_update (stats,
2127 gettext_noop ("# peers connected"),
2130 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2131 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2132 cim.distance = htonl (distance);
2133 cim.latency = GNUNET_TIME_relative_hton (latency);
2134 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2136 while (cpos != NULL)
2138 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2145 * Notify all of our clients about a peer disconnecting.
2148 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2150 struct DisconnectInfoMessage dim;
2151 struct TransportClient *cpos;
2154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2155 "Notifying clients about lost connection to `%s'\n",
2158 GNUNET_STATISTICS_update (stats,
2159 gettext_noop ("# peers connected"),
2162 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2163 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2164 dim.reserved = htonl (0);
2165 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2167 while (cpos != NULL)
2169 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2176 * Find a ForeignAddressList entry for the given neighbour
2177 * that matches the given address and transport.
2179 * @param neighbour which peer we care about
2180 * @param tname name of the transport plugin
2181 * @param session session to look for, NULL for 'any'; otherwise
2182 * can be used for the service to "learn" this session ID
2184 * @param addr binary address
2185 * @param addrlen length of addr
2186 * @return NULL if no such entry exists
2188 static struct ForeignAddressList *
2189 find_peer_address(struct NeighbourList *neighbour,
2191 struct Session *session,
2195 struct ReadyList *head;
2196 struct ForeignAddressList *pos;
2198 head = neighbour->plugins;
2199 while (head != NULL)
2201 if (0 == strcmp (tname, head->plugin->short_name))
2207 pos = head->addresses;
2208 while ( (pos != NULL) &&
2209 ( (pos->addrlen != addrlen) ||
2210 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2212 if ( (session != NULL) &&
2213 (pos->session == session) )
2217 if ( (session != NULL) && (pos != NULL) )
2218 pos->session = session; /* learn it! */
2224 * Get the peer address struct for the given neighbour and
2225 * address. If it doesn't yet exist, create it.
2227 * @param neighbour which peer we care about
2228 * @param tname name of the transport plugin
2229 * @param session session of the plugin, or NULL for none
2230 * @param addr binary address
2231 * @param addrlen length of addr
2232 * @return NULL if we do not have a transport plugin for 'tname'
2234 static struct ForeignAddressList *
2235 add_peer_address (struct NeighbourList *neighbour,
2237 struct Session *session,
2241 struct ReadyList *head;
2242 struct ForeignAddressList *ret;
2244 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2247 head = neighbour->plugins;
2249 while (head != NULL)
2251 if (0 == strcmp (tname, head->plugin->short_name))
2257 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2258 ret->session = session;
2261 ret->addr = (const char*) &ret[1];
2262 memcpy (&ret[1], addr, addrlen);
2268 ret->addrlen = addrlen;
2269 ret->expires = GNUNET_TIME_relative_to_absolute
2270 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2271 ret->latency = GNUNET_TIME_relative_get_forever();
2273 ret->timeout = GNUNET_TIME_relative_to_absolute
2274 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2275 ret->ready_list = head;
2276 ret->next = head->addresses;
2277 head->addresses = ret;
2283 * Closure for 'add_validated_address'.
2285 struct AddValidatedAddressContext
2288 * Entry that has been validated.
2290 const struct ValidationEntry *ve;
2293 * Flag set after we have added the address so
2294 * that we terminate the iteration next time.
2301 * Callback function used to fill a buffer of max bytes with a list of
2302 * addresses in the format used by HELLOs. Should use
2303 * "GNUNET_HELLO_add_address" as a helper function.
2305 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2306 * @param max maximum number of bytes that can be written to buf
2307 * @param buf where to write the address information
2308 * @return number of bytes written, 0 to signal the
2309 * end of the iteration.
2312 add_validated_address (void *cls,
2313 size_t max, void *buf)
2315 struct AddValidatedAddressContext *avac = cls;
2316 const struct ValidationEntry *ve = avac->ve;
2318 if (GNUNET_YES == avac->done)
2320 avac->done = GNUNET_YES;
2321 return GNUNET_HELLO_add_address (ve->transport_name,
2322 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2332 * Closure for 'check_address_exists'.
2334 struct CheckAddressExistsClosure
2337 * Address to check for.
2342 * Name of the transport.
2349 struct Session *session;
2352 * Set to GNUNET_YES if the address exists.
2365 * Iterator over hash map entries. Checks if the given
2366 * validation entry is for the same address as what is given
2369 * @param cls the 'struct CheckAddressExistsClosure*'
2370 * @param key current key code (ignored)
2371 * @param value value in the hash map ('struct ValidationEntry')
2372 * @return GNUNET_YES if we should continue to
2373 * iterate (mismatch), GNUNET_NO if not (entry matched)
2376 check_address_exists (void *cls,
2377 const GNUNET_HashCode * key,
2380 struct CheckAddressExistsClosure *caec = cls;
2381 struct ValidationEntry *ve = value;
2383 if ( (0 == strcmp (caec->tname,
2384 ve->transport_name)) &&
2385 (caec->addrlen == ve->addrlen) &&
2386 (0 == memcmp (caec->addr,
2390 caec->exists = GNUNET_YES;
2393 if ( (ve->session != NULL) &&
2394 (caec->session == ve->session) )
2396 caec->exists = GNUNET_YES;
2405 * Iterator to free entries in the validation_map.
2407 * @param cls closure (unused)
2408 * @param key current key code
2409 * @param value value in the hash map (validation to abort)
2410 * @return GNUNET_YES (always)
2413 abort_validation (void *cls,
2414 const GNUNET_HashCode * key,
2417 struct ValidationEntry *va = value;
2419 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2420 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
2421 GNUNET_free (va->transport_name);
2422 if (va->chvc != NULL)
2424 va->chvc->ve_count--;
2425 if (va->chvc->ve_count == 0)
2427 GNUNET_CONTAINER_DLL_remove (chvc_head,
2430 GNUNET_free (va->chvc);
2440 * HELLO validation cleanup task (validation failed).
2442 * @param cls the 'struct ValidationEntry' that failed
2443 * @param tc scheduler context (unused)
2446 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2448 struct ValidationEntry *va = cls;
2449 struct GNUNET_PeerIdentity pid;
2451 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2452 GNUNET_STATISTICS_update (stats,
2453 gettext_noop ("# address validation timeouts"),
2456 GNUNET_CRYPTO_hash (&va->publicKey,
2458 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2460 GNUNET_break (GNUNET_OK ==
2461 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2464 abort_validation (NULL, NULL, va);
2469 neighbour_timeout_task (void *cls,
2470 const struct GNUNET_SCHEDULER_TaskContext *tc)
2472 struct NeighbourList *n = cls;
2475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2476 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2478 GNUNET_STATISTICS_update (stats,
2479 gettext_noop ("# disconnects due to timeout"),
2482 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2483 disconnect_neighbour (n, GNUNET_NO);
2488 * Schedule the job that will cause us to send a PING to the
2489 * foreign address to evaluate its validity and latency.
2491 * @param fal address to PING
2494 schedule_next_ping (struct ForeignAddressList *fal);
2498 * Add the given address to the list of foreign addresses
2499 * available for the given peer (check for duplicates).
2501 * @param cls the respective 'struct NeighbourList' to update
2502 * @param tname name of the transport
2503 * @param expiration expiration time
2504 * @param addr the address
2505 * @param addrlen length of the address
2506 * @return GNUNET_OK (always)
2509 add_to_foreign_address_list (void *cls,
2511 struct GNUNET_TIME_Absolute expiration,
2515 struct NeighbourList *n = cls;
2516 struct ForeignAddressList *fal;
2519 GNUNET_STATISTICS_update (stats,
2520 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2524 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2529 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2530 a2s (tname, addr, addrlen),
2532 GNUNET_i2s (&n->id),
2535 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2538 GNUNET_STATISTICS_update (stats,
2539 gettext_noop ("# previously validated addresses lacking transport"),
2545 fal->expires = GNUNET_TIME_absolute_max (expiration,
2547 schedule_next_ping (fal);
2553 fal->expires = GNUNET_TIME_absolute_max (expiration,
2558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2559 "Failed to add new address for `%4s'\n",
2560 GNUNET_i2s (&n->id));
2563 if (fal->validated == GNUNET_NO)
2565 fal->validated = GNUNET_YES;
2566 GNUNET_STATISTICS_update (stats,
2567 gettext_noop ("# peer addresses considered valid"),
2571 if (try == GNUNET_YES)
2573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2574 "Have new addresses, will try to trigger transmissions.\n");
2575 try_transmission_to_peer (n);
2582 * Add addresses in validated HELLO "h" to the set of addresses
2583 * we have for this peer.
2585 * @param cls closure ('struct NeighbourList*')
2586 * @param peer id of the peer, NULL for last call
2587 * @param h hello message for the peer (can be NULL)
2588 * @param trust amount of trust we have in the peer (not used)
2591 add_hello_for_peer (void *cls,
2592 const struct GNUNET_PeerIdentity *peer,
2593 const struct GNUNET_HELLO_Message *h,
2596 struct NeighbourList *n = cls;
2604 return; /* no HELLO available */
2606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2607 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2611 if (GNUNET_YES != n->public_key_valid)
2613 GNUNET_HELLO_get_key (h, &n->publicKey);
2614 n->public_key_valid = GNUNET_YES;
2616 GNUNET_HELLO_iterate_addresses (h,
2618 &add_to_foreign_address_list,
2624 * Create a fresh entry in our neighbour list for the given peer.
2625 * Will try to transmit our current HELLO to the new neighbour.
2626 * Do not call this function directly, use 'setup_peer_check_blacklist.
2628 * @param peer the peer for which we create the entry
2629 * @param do_hello should we schedule transmitting a HELLO
2630 * @return the new neighbour list entry
2632 static struct NeighbourList *
2633 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2636 struct NeighbourList *n;
2637 struct TransportPlugin *tp;
2638 struct ReadyList *rl;
2641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2642 "Setting up state for neighbour `%4s'\n",
2645 GNUNET_assert (our_hello != NULL);
2646 GNUNET_STATISTICS_update (stats,
2647 gettext_noop ("# active neighbours"),
2650 n = GNUNET_malloc (sizeof (struct NeighbourList));
2651 n->next = neighbours;
2655 GNUNET_TIME_relative_to_absolute
2656 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2657 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2658 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2659 MAX_BANDWIDTH_CARRY_S);
2663 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2665 rl = GNUNET_malloc (sizeof (struct ReadyList));
2667 rl->next = n->plugins;
2670 rl->addresses = NULL;
2674 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2676 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2677 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2678 &neighbour_timeout_task, n);
2681 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2682 0, GNUNET_TIME_UNIT_FOREVER_REL,
2683 &add_hello_for_peer, n);
2684 transmit_to_peer (NULL, NULL, 0,
2685 HELLO_ADDRESS_EXPIRATION,
2686 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2694 * Function called after we have checked if communicating
2695 * with a given peer is acceptable.
2697 * @param cls closure
2698 * @param n NULL if communication is not acceptable
2700 typedef void (*SetupContinuation)(void *cls,
2701 struct NeighbourList *n);
2705 * Information kept for each client registered to perform
2711 * This is a linked list.
2713 struct Blacklisters *next;
2716 * This is a linked list.
2718 struct Blacklisters *prev;
2721 * Client responsible for this entry.
2723 struct GNUNET_SERVER_Client *client;
2726 * Blacklist check that we're currently performing.
2728 struct BlacklistCheck *bc;
2734 * Head of DLL of blacklisting clients.
2736 static struct Blacklisters *bl_head;
2739 * Tail of DLL of blacklisting clients.
2741 static struct Blacklisters *bl_tail;
2745 * Context we use when performing a blacklist check.
2747 struct BlacklistCheck
2751 * This is a linked list.
2753 struct BlacklistCheck *next;
2756 * This is a linked list.
2758 struct BlacklistCheck *prev;
2761 * Peer being checked.
2763 struct GNUNET_PeerIdentity peer;
2766 * Option for setup neighbour afterwards.
2771 * Continuation to call with the result.
2773 SetupContinuation cont;
2781 * Current transmission request handle for this client, or NULL if no
2782 * request is pending.
2784 struct GNUNET_CONNECTION_TransmitHandle *th;
2787 * Our current position in the blacklisters list.
2789 struct Blacklisters *bl_pos;
2792 * Current task performing the check.
2794 GNUNET_SCHEDULER_TaskIdentifier task;
2799 * Head of DLL of active blacklisting queries.
2801 static struct BlacklistCheck *bc_head;
2804 * Tail of DLL of active blacklisting queries.
2806 static struct BlacklistCheck *bc_tail;
2810 * Perform next action in the blacklist check.
2812 * @param cls the 'struct BlacklistCheck*'
2816 do_blacklist_check (void *cls,
2817 const struct GNUNET_SCHEDULER_TaskContext *tc);
2821 * Transmit blacklist query to the client.
2823 * @param cls the 'struct BlacklistCheck'
2824 * @param size number of bytes allowed
2825 * @param buf where to copy the message
2826 * @return number of bytes copied to buf
2829 transmit_blacklist_message (void *cls,
2833 struct BlacklistCheck *bc = cls;
2834 struct Blacklisters *bl;
2835 struct BlacklistMessage bm;
2840 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2841 bc->task = GNUNET_SCHEDULER_add_now (sched,
2842 &do_blacklist_check,
2847 bm.header.size = htons (sizeof (struct BlacklistMessage));
2848 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2849 bm.is_allowed = htonl (0);
2851 memcpy (buf, &bm, sizeof (bm));
2852 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2858 * Perform next action in the blacklist check.
2860 * @param cls the 'struct BlacklistCheck*'
2864 do_blacklist_check (void *cls,
2865 const struct GNUNET_SCHEDULER_TaskContext *tc)
2867 struct BlacklistCheck *bc = cls;
2868 struct Blacklisters *bl;
2870 bc->task = GNUNET_SCHEDULER_NO_TASK;
2874 bc->cont (bc->cont_cls,
2875 setup_new_neighbour (&bc->peer, bc->do_hello));
2882 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2883 sizeof (struct BlacklistMessage),
2884 GNUNET_TIME_UNIT_FOREVER_REL,
2885 &transmit_blacklist_message,
2892 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2893 * does not yet exist, check the blacklist. If the blacklist says creating
2894 * one is acceptable, create one and call the continuation; otherwise
2895 * call the continuation with NULL.
2897 * @param peer peer to setup or look up a struct NeighbourList for
2898 * @param do_hello should we also schedule sending our HELLO to the peer
2899 * if this is a new record
2900 * @param cont function to call with the 'struct NeigbhbourList*'
2901 * @param cont_cls closure for cont
2904 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
2906 SetupContinuation cont,
2909 struct NeighbourList *n;
2910 struct BlacklistCheck *bc;
2912 n = find_neighbour(peer);
2918 if (bl_head == NULL)
2921 setup_new_neighbour (peer, do_hello));
2924 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2925 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2927 bc->do_hello = do_hello;
2929 bc->cont_cls = cont_cls;
2930 bc->bl_pos = bl_head;
2931 bc->task = GNUNET_SCHEDULER_add_now (sched,
2932 &do_blacklist_check,
2938 * Function called with the result of querying a new blacklister about
2939 * it being allowed (or not) to continue to talk to an existing neighbour.
2941 * @param cls the original 'struct NeighbourList'
2942 * @param n NULL if we need to disconnect
2945 confirm_or_drop_neighbour (void *cls,
2946 struct NeighbourList *n)
2948 struct NeighbourList * orig = cls;
2951 disconnect_neighbour (orig, GNUNET_NO);
2956 * Handle a request to start a blacklist.
2958 * @param cls closure (always NULL)
2959 * @param client identification of the client
2960 * @param message the actual message
2963 handle_blacklist_init (void *cls,
2964 struct GNUNET_SERVER_Client *client,
2965 const struct GNUNET_MessageHeader *message)
2967 struct Blacklisters *bl;
2968 struct BlacklistCheck *bc;
2969 struct NeighbourList *n;
2974 if (bl->client == client)
2977 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2982 bl = GNUNET_malloc (sizeof (struct Blacklisters));
2983 bl->client = client;
2984 GNUNET_SERVER_client_keep (client);
2985 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
2986 /* confirm that all existing connections are OK! */
2990 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2991 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2993 bc->do_hello = GNUNET_NO;
2994 bc->cont = &confirm_or_drop_neighbour;
2997 if (n == neighbours) /* all would wait for the same client, no need to
2998 create more than just the first task right now */
2999 bc->task = GNUNET_SCHEDULER_add_now (sched,
3000 &do_blacklist_check,
3008 * Handle a request to blacklist a peer.
3010 * @param cls closure (always NULL)
3011 * @param client identification of the client
3012 * @param message the actual message
3015 handle_blacklist_reply (void *cls,
3016 struct GNUNET_SERVER_Client *client,
3017 const struct GNUNET_MessageHeader *message)
3019 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3020 struct Blacklisters *bl;
3021 struct BlacklistCheck *bc;
3024 while ( (bl != NULL) &&
3025 (bl->client != client) )
3029 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3034 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3036 bc->cont (bc->cont_cls, NULL);
3037 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3042 bc->bl_pos = bc->bl_pos->next;
3043 bc->task = GNUNET_SCHEDULER_add_now (sched,
3044 &do_blacklist_check,
3047 /* check if any other bc's are waiting for this blacklister */
3051 if ( (bc->bl_pos == bl) &&
3052 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3053 bc->task = GNUNET_SCHEDULER_add_now (sched,
3054 &do_blacklist_check,
3062 * Send periodic PING messages to a given foreign address.
3064 * @param cls our 'struct PeriodicValidationContext*'
3065 * @param tc task context
3068 send_periodic_ping (void *cls,
3069 const struct GNUNET_SCHEDULER_TaskContext *tc)
3071 struct ForeignAddressList *peer_address = cls;
3072 struct TransportPlugin *tp;
3073 struct ValidationEntry *va;
3074 struct NeighbourList *neighbour;
3075 struct TransportPingMessage ping;
3076 struct CheckAddressExistsClosure caec;
3078 uint16_t hello_size;
3081 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3082 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3084 tp = peer_address->ready_list->plugin;
3085 neighbour = peer_address->ready_list->neighbour;
3086 if (GNUNET_YES != neighbour->public_key_valid)
3088 /* no public key yet, try again later */
3089 schedule_next_ping (peer_address);
3092 caec.addr = peer_address->addr;
3093 caec.addrlen = peer_address->addrlen;
3094 caec.tname = tp->short_name;
3095 caec.session = peer_address->session;
3096 caec.exists = GNUNET_NO;
3097 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3098 &check_address_exists,
3100 if (caec.exists == GNUNET_YES)
3102 /* During validation attempts we will likely trigger the other
3103 peer trying to validate our address which in turn will cause
3104 it to send us its HELLO, so we expect to hit this case rather
3105 frequently. Only print something if we are very verbose. */
3106 #if DEBUG_TRANSPORT > 1
3107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3108 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3109 (peer_address->addr != NULL)
3110 ? a2s (tp->short_name,
3112 peer_address->addrlen)
3115 GNUNET_i2s (&neighbour->id));
3117 schedule_next_ping (peer_address);
3120 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3121 va->transport_name = GNUNET_strdup (tp->short_name);
3122 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3124 va->send_time = GNUNET_TIME_absolute_get();
3125 va->session = peer_address->session;
3126 if (peer_address->addr != NULL)
3128 va->addr = (const void*) &va[1];
3129 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3130 va->addrlen = peer_address->addrlen;
3132 memcpy(&va->publicKey,
3133 &neighbour->publicKey,
3134 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3136 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3137 HELLO_VERIFICATION_TIMEOUT,
3138 &timeout_hello_validation,
3140 GNUNET_CONTAINER_multihashmap_put (validation_map,
3141 &neighbour->id.hashPubKey,
3143 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3144 hello_size = GNUNET_HELLO_size(our_hello);
3145 tsize = sizeof(struct TransportPingMessage) + hello_size;
3146 message_buf = GNUNET_malloc(tsize);
3147 ping.challenge = htonl(va->challenge);
3148 ping.header.size = htons(sizeof(struct TransportPingMessage));
3149 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3150 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3151 memcpy(message_buf, our_hello, hello_size);
3152 memcpy(&message_buf[hello_size],
3154 sizeof(struct TransportPingMessage));
3155 #if DEBUG_TRANSPORT_REVALIDATION
3156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3157 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3158 (peer_address->addr != NULL)
3159 ? a2s (peer_address->plugin->short_name,
3161 peer_address->addrlen)
3164 GNUNET_i2s (&neighbour->id),
3165 "HELLO", hello_size,
3166 "PING", sizeof (struct TransportPingMessage));
3168 GNUNET_STATISTICS_update (stats,
3169 gettext_noop ("# PING messages sent for re-validation"),
3172 transmit_to_peer (NULL, peer_address,
3173 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3174 HELLO_VERIFICATION_TIMEOUT,
3176 GNUNET_YES, neighbour);
3177 GNUNET_free(message_buf);
3178 schedule_next_ping (peer_address);
3183 * Schedule the job that will cause us to send a PING to the
3184 * foreign address to evaluate its validity and latency.
3186 * @param fal address to PING
3189 schedule_next_ping (struct ForeignAddressList *fal)
3191 struct GNUNET_TIME_Relative delay;
3193 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3195 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3196 delay.value /= 2; /* do before expiration */
3197 delay = GNUNET_TIME_relative_min (delay,
3198 LATENCY_EVALUATION_MAX_DELAY);
3199 if (GNUNET_YES != fal->estimated)
3201 delay = GNUNET_TIME_UNIT_ZERO;
3202 fal->estimated = GNUNET_YES;
3204 if (GNUNET_YES == fal->connected)
3206 delay = GNUNET_TIME_relative_min (delay,
3207 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3209 /* FIXME: also adjust delay based on how close the last
3210 observed latency is to the latency of the best alternative */
3211 /* bound how fast we can go */
3212 delay = GNUNET_TIME_relative_max (delay,
3213 GNUNET_TIME_UNIT_SECONDS);
3214 /* randomize a bit (to avoid doing all at the same time) */
3215 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3216 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3218 &send_periodic_ping,
3226 * Function that will be called if we receive some payload
3227 * from another peer.
3229 * @param message the payload
3230 * @param n peer who claimed to be the sender
3233 handle_payload_message (const struct GNUNET_MessageHeader *message,
3234 struct NeighbourList *n)
3236 struct InboundMessage *im;
3237 struct TransportClient *cpos;
3240 msize = ntohs (message->size);
3241 if (n->received_pong == GNUNET_NO)
3243 GNUNET_free_non_null (n->pre_connect_message_buffer);
3244 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3245 memcpy (n->pre_connect_message_buffer, message, msize);
3249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3250 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3251 ntohs (message->type),
3252 ntohs (message->size),
3253 GNUNET_i2s (&n->id));
3255 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3258 n->quota_violation_count++;
3260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3261 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3262 n->in_tracker.available_bytes_per_s__,
3263 n->quota_violation_count);
3265 /* Discount 32k per violation */
3266 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3271 if (n->quota_violation_count > 0)
3273 /* try to add 32k back */
3274 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3276 n->quota_violation_count--;
3279 GNUNET_STATISTICS_update (stats,
3280 gettext_noop ("# payload received from other peers"),
3283 /* transmit message to all clients */
3284 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3285 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3286 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3287 im->latency = GNUNET_TIME_relative_hton (n->latency);
3289 im->distance = ntohl(n->distance);
3290 memcpy (&im[1], message, msize);
3292 while (cpos != NULL)
3294 transmit_to_client (cpos, &im->header, GNUNET_YES);
3302 * Iterator over hash map entries. Checks if the given validation
3303 * entry is for the same challenge as what is given in the PONG.
3305 * @param cls the 'struct TransportPongMessage*'
3306 * @param key peer identity
3307 * @param value value in the hash map ('struct ValidationEntry')
3308 * @return GNUNET_YES if we should continue to
3309 * iterate (mismatch), GNUNET_NO if not (entry matched)
3312 check_pending_validation (void *cls,
3313 const GNUNET_HashCode * key,
3316 const struct TransportPongMessage *pong = cls;
3317 struct ValidationEntry *ve = value;
3318 struct AddValidatedAddressContext avac;
3319 unsigned int challenge = ntohl(pong->challenge);
3320 struct GNUNET_HELLO_Message *hello;
3321 struct GNUNET_PeerIdentity target;
3322 struct NeighbourList *n;
3323 struct ForeignAddressList *fal;
3324 struct GNUNET_MessageHeader *prem;
3326 if (ve->challenge != challenge)
3331 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING,
3336 GNUNET_break_op (0);
3342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3343 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3346 ? a2s (ve->transport_name,
3347 (const struct sockaddr *) ve->addr,
3350 ve->transport_name);
3352 GNUNET_STATISTICS_update (stats,
3353 gettext_noop ("# address validation successes"),
3356 /* create the updated HELLO */
3357 GNUNET_CRYPTO_hash (&ve->publicKey,
3358 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3359 &target.hashPubKey);
3360 if (ve->addr != NULL)
3362 avac.done = GNUNET_NO;
3364 hello = GNUNET_HELLO_create (&ve->publicKey,
3365 &add_validated_address,
3367 GNUNET_PEERINFO_add_peer (peerinfo,
3369 GNUNET_free (hello);
3371 n = find_neighbour (&target);
3374 n->publicKey = ve->publicKey;
3375 n->public_key_valid = GNUNET_YES;
3376 fal = add_peer_address (n,
3381 GNUNET_assert (fal != NULL);
3382 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3383 fal->validated = GNUNET_YES;
3384 mark_address_connected (fal);
3385 GNUNET_STATISTICS_update (stats,
3386 gettext_noop ("# peer addresses considered valid"),
3389 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3390 schedule_next_ping (fal);
3391 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
3392 n->latency = fal->latency;
3394 n->latency.value = (fal->latency.value + n->latency.value) / 2;
3396 n->distance = fal->distance;
3397 if (GNUNET_NO == n->received_pong)
3399 n->received_pong = GNUNET_YES;
3400 notify_clients_connect (&target, n->latency, n->distance);
3401 if (NULL != (prem = n->pre_connect_message_buffer))
3403 n->pre_connect_message_buffer = NULL;
3404 handle_payload_message (prem, n);
3408 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3410 GNUNET_SCHEDULER_cancel (sched,
3412 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3413 try_transmission_to_peer (n);
3417 /* clean up validation entry */
3418 GNUNET_assert (GNUNET_YES ==
3419 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3422 abort_validation (NULL, NULL, ve);
3428 * Function that will be called if we receive a validation
3429 * of an address challenge that we transmitted to another
3430 * peer. Note that the validation should only be considered
3431 * acceptable if the challenge matches AND if the sender
3432 * address is at least a plausible address for this peer
3433 * (otherwise we may be seeing a MiM attack).
3435 * @param cls closure
3436 * @param message the pong message
3437 * @param peer who responded to our challenge
3438 * @param sender_address string describing our sender address (as observed
3439 * by the other peer in binary format)
3440 * @param sender_address_len number of bytes in 'sender_address'
3443 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3444 const struct GNUNET_PeerIdentity *peer,
3445 const char *sender_address,
3446 size_t sender_address_len)
3448 #if DEBUG_TRANSPORT > 1
3449 /* we get tons of these that just get discarded, only log
3450 if we are quite verbose */
3451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3452 "Receiving `%s' message from `%4s'.\n", "PONG",
3455 GNUNET_STATISTICS_update (stats,
3456 gettext_noop ("# PONG messages received"),
3459 if (GNUNET_SYSERR !=
3460 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3462 &check_pending_validation,
3465 /* This is *expected* to happen a lot since we send
3466 PONGs to *all* known addresses of the sender of
3467 the PING, so most likely we get multiple PONGs
3468 per PING, and all but the first PONG will end up
3469 here. So really we should not print anything here
3470 unless we want to be very, very verbose... */
3471 #if DEBUG_TRANSPORT > 2
3472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3473 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3485 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3487 * @param cls the 'struct ValidationEntry*'
3488 * @param neighbour neighbour to validate, NULL if validation failed
3491 transmit_hello_and_ping (void *cls,
3492 struct NeighbourList *neighbour)
3494 struct ValidationEntry *va = cls;
3495 struct ForeignAddressList *peer_address;
3496 struct TransportPingMessage ping;
3497 uint16_t hello_size;
3500 struct GNUNET_PeerIdentity id;
3502 GNUNET_CRYPTO_hash (&va->publicKey,
3503 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3505 if (neighbour == NULL)
3507 /* FIXME: stats... */
3508 GNUNET_break (GNUNET_OK ==
3509 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3512 abort_validation (NULL, NULL, va);
3515 neighbour->publicKey = va->publicKey;
3516 neighbour->public_key_valid = GNUNET_YES;
3517 peer_address = add_peer_address (neighbour,
3518 va->transport_name, NULL,
3519 (const void*) &va[1],
3521 if (peer_address == NULL)
3523 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3524 "Failed to add peer `%4s' for plugin `%s'\n",
3525 GNUNET_i2s (&neighbour->id),
3526 va->transport_name);
3527 GNUNET_break (GNUNET_OK ==
3528 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3531 abort_validation (NULL, NULL, va);
3534 hello_size = GNUNET_HELLO_size(our_hello);
3535 tsize = sizeof(struct TransportPingMessage) + hello_size;
3536 message_buf = GNUNET_malloc(tsize);
3537 ping.challenge = htonl(va->challenge);
3538 ping.header.size = htons(sizeof(struct TransportPingMessage));
3539 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3540 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3541 memcpy(message_buf, our_hello, hello_size);
3542 memcpy(&message_buf[hello_size],
3544 sizeof(struct TransportPingMessage));
3546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3547 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3548 a2s (va->transport_name,
3549 (const void*) &va[1], va->addrlen),
3551 GNUNET_i2s (&neighbour->id),
3552 "HELLO", hello_size,
3553 "PING", sizeof (struct TransportPingMessage));
3556 GNUNET_STATISTICS_update (stats,
3557 gettext_noop ("# PING messages sent for initial validation"),
3560 transmit_to_peer (NULL, peer_address,
3561 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3562 HELLO_VERIFICATION_TIMEOUT,
3564 GNUNET_YES, neighbour);
3565 GNUNET_free(message_buf);
3570 * Check if the given address is already being validated; if not,
3571 * append the given address to the list of entries that are being be
3572 * validated and initiate validation.
3574 * @param cls closure ('struct CheckHelloValidatedContext *')
3575 * @param tname name of the transport
3576 * @param expiration expiration time
3577 * @param addr the address
3578 * @param addrlen length of the address
3579 * @return GNUNET_OK (always)
3582 run_validation (void *cls,
3584 struct GNUNET_TIME_Absolute expiration,
3588 struct CheckHelloValidatedContext *chvc = cls;
3589 struct GNUNET_PeerIdentity id;
3590 struct TransportPlugin *tp;
3591 struct ValidationEntry *va;
3592 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3593 struct CheckAddressExistsClosure caec;
3594 struct OwnAddressList *oal;
3596 GNUNET_assert (addr != NULL);
3598 GNUNET_STATISTICS_update (stats,
3599 gettext_noop ("# peer addresses scheduled for validation"),
3602 tp = find_transport (tname);
3605 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3606 GNUNET_ERROR_TYPE_BULK,
3608 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3610 GNUNET_STATISTICS_update (stats,
3611 gettext_noop ("# peer addresses not validated (plugin not available)"),
3616 /* check if this is one of our own addresses */
3617 oal = tp->addresses;
3620 if ( (oal->addrlen == addrlen) &&
3621 (0 == memcmp (oal->addr,
3625 /* not plausible, this address is equivalent to our own address! */
3626 GNUNET_STATISTICS_update (stats,
3627 gettext_noop ("# peer addresses not validated (loopback)"),
3634 GNUNET_HELLO_get_key (chvc->hello, &pk);
3635 GNUNET_CRYPTO_hash (&pk,
3637 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3640 if (is_blacklisted(&id, tp))
3643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3644 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3652 caec.addrlen = addrlen;
3653 caec.session = NULL;
3655 caec.exists = GNUNET_NO;
3656 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3657 &check_address_exists,
3659 if (caec.exists == GNUNET_YES)
3661 /* During validation attempts we will likely trigger the other
3662 peer trying to validate our address which in turn will cause
3663 it to send us its HELLO, so we expect to hit this case rather
3664 frequently. Only print something if we are very verbose. */
3665 #if DEBUG_TRANSPORT > 1
3666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3667 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3668 a2s (tname, addr, addrlen),
3672 GNUNET_STATISTICS_update (stats,
3673 gettext_noop ("# peer addresses not validated (in progress)"),
3678 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3681 va->transport_name = GNUNET_strdup (tname);
3682 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3684 va->send_time = GNUNET_TIME_absolute_get();
3685 va->addr = (const void*) &va[1];
3686 memcpy (&va[1], addr, addrlen);
3687 va->addrlen = addrlen;
3688 GNUNET_HELLO_get_key (chvc->hello,
3690 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3691 HELLO_VERIFICATION_TIMEOUT,
3692 &timeout_hello_validation,
3694 GNUNET_CONTAINER_multihashmap_put (validation_map,
3697 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3698 setup_peer_check_blacklist (&id, GNUNET_NO,
3699 &transmit_hello_and_ping,
3706 * Check if addresses in validated hello "h" overlap with
3707 * those in "chvc->hello" and validate the rest.
3709 * @param cls closure
3710 * @param peer id of the peer, NULL for last call
3711 * @param h hello message for the peer (can be NULL)
3712 * @param trust amount of trust we have in the peer (not used)
3715 check_hello_validated (void *cls,
3716 const struct GNUNET_PeerIdentity *peer,
3717 const struct GNUNET_HELLO_Message *h,
3720 struct CheckHelloValidatedContext *chvc = cls;
3721 struct GNUNET_HELLO_Message *plain_hello;
3722 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3723 struct GNUNET_PeerIdentity target;
3724 struct NeighbourList *n;
3729 if (GNUNET_NO == chvc->hello_known)
3731 /* notify PEERINFO about the peer now, so that we at least
3732 have the public key if some other component needs it */
3733 GNUNET_HELLO_get_key (chvc->hello, &pk);
3734 GNUNET_CRYPTO_hash (&pk,
3735 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3736 &target.hashPubKey);
3737 plain_hello = GNUNET_HELLO_create (&pk,
3740 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
3741 GNUNET_free (plain_hello);
3743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3744 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
3746 GNUNET_i2s (&target));
3748 GNUNET_STATISTICS_update (stats,
3749 gettext_noop ("# new HELLOs requiring full validation"),
3752 GNUNET_HELLO_iterate_addresses (chvc->hello,
3759 GNUNET_STATISTICS_update (stats,
3760 gettext_noop ("# duplicate HELLO (peer known)"),
3765 if (chvc->ve_count == 0)
3767 GNUNET_CONTAINER_DLL_remove (chvc_head,
3777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3778 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
3782 chvc->hello_known = GNUNET_YES;
3783 n = find_neighbour (peer);
3786 GNUNET_HELLO_iterate_addresses (h,
3788 &add_to_foreign_address_list,
3790 try_transmission_to_peer (n);
3794 GNUNET_STATISTICS_update (stats,
3795 gettext_noop ("# no existing neighbour record (validating HELLO)"),
3799 GNUNET_STATISTICS_update (stats,
3800 gettext_noop ("# HELLO validations (update case)"),
3803 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
3805 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
3812 * Process HELLO-message.
3814 * @param plugin transport involved, may be NULL
3815 * @param message the actual message
3816 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
3819 process_hello (struct TransportPlugin *plugin,
3820 const struct GNUNET_MessageHeader *message)
3823 struct GNUNET_PeerIdentity target;
3824 const struct GNUNET_HELLO_Message *hello;
3825 struct CheckHelloValidatedContext *chvc;
3826 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
3828 hsize = ntohs (message->size);
3829 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
3830 (hsize < sizeof (struct GNUNET_MessageHeader)))
3833 return GNUNET_SYSERR;
3835 GNUNET_STATISTICS_update (stats,
3836 gettext_noop ("# HELLOs received for validation"),
3839 /* first, check if load is too high */
3840 if (GNUNET_SCHEDULER_get_load (sched,
3841 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
3843 GNUNET_STATISTICS_update (stats,
3844 gettext_noop ("# HELLOs ignored due to high load"),
3849 hello = (const struct GNUNET_HELLO_Message *) message;
3850 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
3852 GNUNET_break_op (0);
3853 return GNUNET_SYSERR;
3855 GNUNET_CRYPTO_hash (&publicKey,
3856 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3857 &target.hashPubKey);
3858 if (0 == memcmp (&my_identity,
3860 sizeof (struct GNUNET_PeerIdentity)))
3862 GNUNET_STATISTICS_update (stats,
3863 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
3869 while (NULL != chvc)
3871 if (GNUNET_HELLO_equals (hello,
3873 GNUNET_TIME_absolute_get ()).value > 0)
3876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3877 "Received duplicate `%s' message for `%4s'; ignored\n",
3879 GNUNET_i2s (&target));
3881 return GNUNET_OK; /* validation already pending */
3883 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
3884 GNUNET_break (0 != memcmp (hello, chvc->hello,
3885 GNUNET_HELLO_size(hello)));
3889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3890 "Starting validation of `%s' message for `%4s' of size %u\n",
3892 GNUNET_i2s (&target),
3893 GNUNET_HELLO_size(hello));
3895 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
3897 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
3898 memcpy (&chvc[1], hello, hsize);
3899 GNUNET_CONTAINER_DLL_insert (chvc_head,
3902 /* finally, check if HELLO was previously validated
3903 (continuation will then schedule actual validation) */
3904 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
3907 HELLO_VERIFICATION_TIMEOUT,
3908 &check_hello_validated, chvc);
3914 * The peer specified by the given neighbour has timed-out or a plugin
3915 * has disconnected. We may either need to do nothing (other plugins
3916 * still up), or trigger a full disconnect and clean up. This
3917 * function updates our state and does the necessary notifications.
3918 * Also notifies our clients that the neighbour is now officially
3921 * @param n the neighbour list entry for the peer
3922 * @param check should we just check if all plugins
3923 * disconnected or must we ask all plugins to
3927 disconnect_neighbour (struct NeighbourList *n, int check)
3929 struct ReadyList *rpos;
3930 struct NeighbourList *npos;
3931 struct NeighbourList *nprev;
3932 struct MessageQueue *mq;
3933 struct ForeignAddressList *peer_addresses;
3934 struct ForeignAddressList *peer_pos;
3936 if (GNUNET_YES == check)
3939 while (NULL != rpos)
3941 peer_addresses = rpos->addresses;
3942 while (peer_addresses != NULL)
3944 if (GNUNET_YES == peer_addresses->connected)
3945 return; /* still connected */
3946 peer_addresses = peer_addresses->next;
3952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3953 "Disconnecting from `%4s'\n",
3954 GNUNET_i2s (&n->id));
3956 /* remove n from neighbours list */
3959 while ((npos != NULL) && (npos != n))
3964 GNUNET_assert (npos != NULL);
3966 neighbours = n->next;
3968 nprev->next = n->next;
3970 /* notify all clients about disconnect */
3971 if (GNUNET_YES == n->received_pong)
3972 notify_clients_disconnect (&n->id);
3974 /* clean up all plugins, cancel connections and pending transmissions */
3975 while (NULL != (rpos = n->plugins))
3977 n->plugins = rpos->next;
3978 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
3979 while (rpos->addresses != NULL)
3981 peer_pos = rpos->addresses;
3982 rpos->addresses = peer_pos->next;
3983 if (peer_pos->connected == GNUNET_YES)
3984 GNUNET_STATISTICS_update (stats,
3985 gettext_noop ("# connected addresses"),
3988 if (GNUNET_YES == peer_pos->validated)
3989 GNUNET_STATISTICS_update (stats,
3990 gettext_noop ("# peer addresses considered valid"),
3993 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
3995 GNUNET_SCHEDULER_cancel (sched,
3996 peer_pos->revalidate_task);
3997 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3999 GNUNET_free(peer_pos);
4004 /* free all messages on the queue */
4005 while (NULL != (mq = n->messages_head))
4007 GNUNET_STATISTICS_update (stats,
4008 gettext_noop ("# bytes in message queue for other peers"),
4009 - (int64_t) mq->message_buf_size,
4011 GNUNET_STATISTICS_update (stats,
4012 gettext_noop ("# bytes discarded due to disconnect"),
4013 mq->message_buf_size,
4015 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4018 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4020 sizeof(struct GNUNET_PeerIdentity)));
4023 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4025 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
4026 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4028 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4030 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
4031 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4033 if (n->piter != NULL)
4035 GNUNET_PEERINFO_iterate_cancel (n->piter);
4038 /* finally, free n itself */
4039 GNUNET_STATISTICS_update (stats,
4040 gettext_noop ("# active neighbours"),
4043 GNUNET_free_non_null (n->pre_connect_message_buffer);
4049 * We have received a PING message from someone. Need to send a PONG message
4050 * in response to the peer by any means necessary.
4053 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4054 const struct GNUNET_PeerIdentity *peer,
4055 const char *sender_address,
4056 uint16_t sender_address_len)
4058 struct TransportPlugin *plugin = cls;
4059 struct TransportPingMessage *ping;
4060 struct TransportPongMessage *pong;
4061 struct NeighbourList *n;
4062 struct ReadyList *rl;
4063 struct ForeignAddressList *fal;
4065 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
4067 GNUNET_break_op (0);
4068 return GNUNET_SYSERR;
4071 ping = (struct TransportPingMessage *) message;
4072 if (0 != memcmp (&ping->target,
4073 plugin->env.my_identity,
4074 sizeof (struct GNUNET_PeerIdentity)))
4076 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4077 _("Received `%s' message not destined for me!\n"),
4079 return GNUNET_SYSERR;
4082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4083 "Processing `%s' from `%s'\n",
4085 (sender_address != NULL)
4086 ? a2s (plugin->short_name,
4087 (const struct sockaddr *)sender_address,
4091 GNUNET_STATISTICS_update (stats,
4092 gettext_noop ("# PING messages received"),
4095 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
4096 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
4097 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4098 pong->purpose.size =
4099 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4101 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
4102 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING);
4103 pong->challenge = ping->challenge;
4104 pong->addrlen = htons(sender_address_len);
4105 memcpy(&pong->signer,
4107 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
4108 if (sender_address != NULL)
4109 memcpy (&pong[1], sender_address, sender_address_len);
4111 GNUNET_assert (GNUNET_OK ==
4112 GNUNET_CRYPTO_rsa_sign (my_private_key,
4113 &pong->purpose, &pong->signature));
4115 n = find_neighbour(peer);
4116 GNUNET_assert (n != NULL);
4117 /* first try reliable response transmission */
4121 fal = rl->addresses;
4124 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4127 ntohs (pong->header.size),
4128 TRANSPORT_PONG_PRIORITY,
4129 HELLO_VERIFICATION_TIMEOUT,
4137 GNUNET_STATISTICS_update (stats,
4138 gettext_noop ("# PONGs unicast via reliable transport"),
4148 /* no reliable method found, do multicast */
4149 GNUNET_STATISTICS_update (stats,
4150 gettext_noop ("# PONGs multicast to all available addresses"),
4156 fal = rl->addresses;
4159 transmit_to_peer(NULL, fal,
4160 TRANSPORT_PONG_PRIORITY,
4161 HELLO_VERIFICATION_TIMEOUT,
4163 ntohs(pong->header.size),
4176 * Function called by the plugin for each received message.
4177 * Update data volumes, possibly notify plugins about
4178 * reducing the rate at which they read from the socket
4179 * and generally forward to our receive callback.
4181 * @param cls the "struct TransportPlugin *" we gave to the plugin
4182 * @param peer (claimed) identity of the other peer
4183 * @param message the message, NULL if we only care about
4184 * learning about the delay until we should receive again
4185 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4186 * @param session identifier used for this session (can be NULL)
4187 * @param sender_address binary address of the sender (if observed)
4188 * @param sender_address_len number of bytes in sender_address
4189 * @return how long the plugin should wait until receiving more data
4190 * (plugins that do not support this, can ignore the return value)
4192 static struct GNUNET_TIME_Relative
4193 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4194 const struct GNUNET_MessageHeader *message,
4196 struct Session *session,
4197 const char *sender_address,
4198 uint16_t sender_address_len)
4200 struct TransportPlugin *plugin = cls;
4201 struct ReadyList *service_context;
4202 struct ForeignAddressList *peer_address;
4204 struct NeighbourList *n;
4205 struct GNUNET_TIME_Relative ret;
4207 if (is_blacklisted (peer, plugin))
4208 return GNUNET_TIME_UNIT_FOREVER_REL;
4210 n = find_neighbour (peer);
4212 n = setup_new_neighbour (peer, GNUNET_YES);
4213 service_context = n->plugins;
4214 while ((service_context != NULL) && (plugin != service_context->plugin))
4215 service_context = service_context->next;
4216 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4217 peer_address = NULL;
4218 if (message != NULL)
4220 if ( (session != NULL) ||
4221 (sender_address != NULL) )
4222 peer_address = add_peer_address (n,
4226 sender_address_len);
4227 if (peer_address != NULL)
4229 peer_address->distance = distance;
4230 if (GNUNET_YES == peer_address->validated)
4231 mark_address_connected (peer_address);
4232 peer_address->timeout
4234 GNUNET_TIME_relative_to_absolute
4235 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4236 schedule_next_ping (peer_address);
4238 /* update traffic received amount ... */
4239 msize = ntohs (message->size);
4240 GNUNET_STATISTICS_update (stats,
4241 gettext_noop ("# bytes received from other peers"),
4244 n->distance = distance;
4246 GNUNET_TIME_relative_to_absolute
4247 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4248 GNUNET_SCHEDULER_cancel (sched,
4251 GNUNET_SCHEDULER_add_delayed (sched,
4252 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4253 &neighbour_timeout_task, n);
4254 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4256 /* dropping message due to frequent inbound volume violations! */
4257 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4258 GNUNET_ERROR_TYPE_BULK,
4260 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4261 n->in_tracker.available_bytes_per_s__,
4262 n->quota_violation_count);
4263 GNUNET_STATISTICS_update (stats,
4264 gettext_noop ("# bandwidth quota violations by other peers"),
4267 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4271 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4272 ntohs (message->type),
4273 ntohs (message->size),
4276 switch (ntohs (message->type))
4278 case GNUNET_MESSAGE_TYPE_HELLO:
4279 GNUNET_STATISTICS_update (stats,
4280 gettext_noop ("# HELLO messages received from other peers"),
4283 process_hello (plugin, message);
4285 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4286 handle_ping (plugin, message, peer, sender_address, sender_address_len);
4288 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4289 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4292 handle_payload_message (message, n);
4296 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4299 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4300 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4301 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4302 (unsigned int) n->in_tracker.available_bytes_per_s__,
4303 (unsigned long long) ret.value);
4304 GNUNET_STATISTICS_update (stats,
4305 gettext_noop ("# ms throttling suggested"),
4306 (int64_t) ret.value,
4313 * Handle START-message. This is the first message sent to us
4314 * by any client which causes us to add it to our list.
4316 * @param cls closure (always NULL)
4317 * @param client identification of the client
4318 * @param message the actual message
4321 handle_start (void *cls,
4322 struct GNUNET_SERVER_Client *client,
4323 const struct GNUNET_MessageHeader *message)
4325 struct TransportClient *c;
4326 struct ConnectInfoMessage cim;
4327 struct NeighbourList *n;
4330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4331 "Received `%s' request from client\n", "START");
4336 if (c->client == client)
4338 /* client already on our list! */
4340 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4345 c = GNUNET_malloc (sizeof (struct TransportClient));
4349 if (our_hello != NULL)
4352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4353 "Sending our own `%s' to new client\n", "HELLO");
4355 transmit_to_client (c,
4356 (const struct GNUNET_MessageHeader *) our_hello,
4358 /* tell new client about all existing connections */
4359 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4360 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4364 if (GNUNET_YES == n->received_pong)
4367 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4368 cim.distance = htonl (n->distance);
4369 transmit_to_client (c, &cim.header, GNUNET_NO);
4374 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4379 * Handle HELLO-message.
4381 * @param cls closure (always NULL)
4382 * @param client identification of the client
4383 * @param message the actual message
4386 handle_hello (void *cls,
4387 struct GNUNET_SERVER_Client *client,
4388 const struct GNUNET_MessageHeader *message)
4392 GNUNET_STATISTICS_update (stats,
4393 gettext_noop ("# HELLOs received from clients"),
4396 ret = process_hello (NULL, message);
4397 GNUNET_SERVER_receive_done (client, ret);
4402 * Closure for 'transmit_client_message'; followed by
4403 * 'msize' bytes of the actual message.
4405 struct TransmitClientMessageContext
4408 * Client on whom's behalf we are sending.
4410 struct GNUNET_SERVER_Client *client;
4413 * Timeout for the transmission.
4415 struct GNUNET_TIME_Absolute timeout;
4423 * Size of the message in bytes.
4430 * Schedule transmission of a message we got from a client to a peer.
4432 * @param cls the 'struct TransmitClientMessageContext*'
4433 * @param n destination, or NULL on error (in that case, drop the message)
4436 transmit_client_message (void *cls,
4437 struct NeighbourList *n)
4439 struct TransmitClientMessageContext *tcmc = cls;
4440 struct TransportClient *tc;
4443 while ((tc != NULL) && (tc->client != tcmc->client))
4448 transmit_to_peer (tc, NULL, tcmc->priority,
4449 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4451 tcmc->msize, GNUNET_NO, n);
4453 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4454 GNUNET_SERVER_client_drop (tcmc->client);
4460 * Handle SEND-message.
4462 * @param cls closure (always NULL)
4463 * @param client identification of the client
4464 * @param message the actual message
4467 handle_send (void *cls,
4468 struct GNUNET_SERVER_Client *client,
4469 const struct GNUNET_MessageHeader *message)
4471 const struct OutboundMessage *obm;
4472 const struct GNUNET_MessageHeader *obmm;
4473 struct TransmitClientMessageContext *tcmc;
4477 size = ntohs (message->size);
4479 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4482 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4485 GNUNET_STATISTICS_update (stats,
4486 gettext_noop ("# payload received for other peers"),
4489 obm = (const struct OutboundMessage *) message;
4490 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4491 msize = size - sizeof (struct OutboundMessage);
4493 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4494 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4495 "SEND", GNUNET_i2s (&obm->peer),
4499 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4500 tcmc->client = client;
4501 tcmc->priority = ntohl (obm->priority);
4502 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4503 tcmc->msize = msize;
4504 memcpy (&tcmc[1], obmm, msize);
4505 GNUNET_SERVER_client_keep (client);
4506 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4507 &transmit_client_message,
4513 * Handle SET_QUOTA-message.
4515 * @param cls closure (always NULL)
4516 * @param client identification of the client
4517 * @param message the actual message
4520 handle_set_quota (void *cls,
4521 struct GNUNET_SERVER_Client *client,
4522 const struct GNUNET_MessageHeader *message)
4524 const struct QuotaSetMessage *qsm =
4525 (const struct QuotaSetMessage *) message;
4526 struct NeighbourList *n;
4528 GNUNET_STATISTICS_update (stats,
4529 gettext_noop ("# SET QUOTA messages received"),
4532 n = find_neighbour (&qsm->peer);
4535 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4536 GNUNET_STATISTICS_update (stats,
4537 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
4543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4544 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
4546 (unsigned int) ntohl (qsm->quota.value__),
4547 (unsigned int) n->in_tracker.available_bytes_per_s__,
4548 GNUNET_i2s (&qsm->peer));
4550 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
4552 if (0 == ntohl (qsm->quota.value__))
4553 disconnect_neighbour (n, GNUNET_NO);
4554 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4559 * Take the given address and append it to the set of results sent back to
4562 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
4563 * @param address the resolved name, NULL to indicate the last response
4566 transmit_address_to_client (void *cls, const char *address)
4568 struct GNUNET_SERVER_TransmitContext *tc = cls;
4571 if (NULL == address)
4574 slen = strlen (address) + 1;
4576 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
4577 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4578 if (NULL == address)
4579 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
4584 * Handle AddressLookup-message.
4586 * @param cls closure (always NULL)
4587 * @param client identification of the client
4588 * @param message the actual message
4591 handle_address_lookup (void *cls,
4592 struct GNUNET_SERVER_Client *client,
4593 const struct GNUNET_MessageHeader *message)
4595 const struct AddressLookupMessage *alum;
4596 struct TransportPlugin *lsPlugin;
4597 const char *nameTransport;
4598 const char *address;
4600 struct GNUNET_SERVER_TransmitContext *tc;
4601 struct GNUNET_TIME_Absolute timeout;
4602 struct GNUNET_TIME_Relative rtimeout;
4605 size = ntohs (message->size);
4606 if (size < sizeof (struct AddressLookupMessage))
4608 GNUNET_break_op (0);
4609 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4612 alum = (const struct AddressLookupMessage *) message;
4613 uint32_t addressLen = ntohl (alum->addrlen);
4614 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
4616 GNUNET_break_op (0);
4617 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4620 address = (const char *) &alum[1];
4621 nameTransport = (const char *) &address[addressLen];
4623 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
4625 GNUNET_break_op (0);
4626 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4629 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
4630 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
4631 numeric = ntohl (alum->numeric_only);
4632 lsPlugin = find_transport (nameTransport);
4633 if (NULL == lsPlugin)
4635 tc = GNUNET_SERVER_transmit_context_create (client);
4636 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
4637 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4638 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
4641 tc = GNUNET_SERVER_transmit_context_create (client);
4642 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
4644 address, addressLen,
4647 &transmit_address_to_client, tc);
4652 * Setup the environment for this plugin.
4655 create_environment (struct TransportPlugin *plug)
4657 plug->env.cfg = cfg;
4658 plug->env.sched = sched;
4659 plug->env.my_identity = &my_identity;
4660 plug->env.cls = plug;
4661 plug->env.receive = &plugin_env_receive;
4662 plug->env.notify_address = &plugin_env_notify_address;
4663 plug->env.session_end = &plugin_env_session_end;
4664 plug->env.max_connections = max_connect_per_transport;
4665 plug->env.stats = stats;
4670 * Start the specified transport (load the plugin).
4673 start_transport (struct GNUNET_SERVER_Handle *server,
4676 struct TransportPlugin *plug;
4679 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4680 _("Loading `%s' transport plugin\n"), name);
4681 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
4682 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
4683 create_environment (plug);
4684 plug->short_name = GNUNET_strdup (name);
4685 plug->lib_name = libname;
4686 plug->next = plugins;
4688 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
4689 if (plug->api == NULL)
4691 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4692 _("Failed to load transport plugin for `%s'\n"), name);
4693 GNUNET_free (plug->short_name);
4694 plugins = plug->next;
4695 GNUNET_free (libname);
4702 * Called whenever a client is disconnected. Frees our
4703 * resources associated with that client.
4705 * @param cls closure
4706 * @param client identification of the client
4709 client_disconnect_notification (void *cls,
4710 struct GNUNET_SERVER_Client *client)
4712 struct TransportClient *pos;
4713 struct TransportClient *prev;
4714 struct ClientMessageQueueEntry *mqe;
4715 struct Blacklisters *bl;
4716 struct BlacklistCheck *bc;
4721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4722 "Client disconnected, cleaning up.\n");
4724 /* clean up blacklister */
4728 if (bl->client == client)
4733 if (bc->bl_pos == bl)
4735 bc->bl_pos = bl->next;
4738 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
4741 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
4742 bc->task = GNUNET_SCHEDULER_add_now (sched,
4743 &do_blacklist_check,
4749 GNUNET_CONTAINER_DLL_remove (bl_head,
4752 GNUNET_SERVER_client_drop (bl->client);
4758 /* clean up 'normal' clients */
4761 while ((pos != NULL) && (pos->client != client))
4768 while (NULL != (mqe = pos->message_queue_head))
4770 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
4771 pos->message_queue_tail,
4773 pos->message_count--;
4777 clients = pos->next;
4779 prev->next = pos->next;
4780 if (GNUNET_YES == pos->tcs_pending)
4785 if (pos->th != NULL)
4787 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
4790 GNUNET_break (0 == pos->message_count);
4796 * Function called when the service shuts down. Unloads our plugins
4797 * and cancels pending validations.
4799 * @param cls closure, unused
4800 * @param tc task context (unused)
4803 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4805 struct TransportPlugin *plug;
4806 struct OwnAddressList *al;
4807 struct CheckHelloValidatedContext *chvc;
4809 while (neighbours != NULL)
4810 disconnect_neighbour (neighbours, GNUNET_NO);
4812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4813 "Transport service is unloading plugins...\n");
4815 while (NULL != (plug = plugins))
4817 plugins = plug->next;
4818 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
4820 GNUNET_SCHEDULER_cancel (plug->env.sched,
4821 plug->address_update_task);
4822 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
4824 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
4825 GNUNET_free (plug->lib_name);
4826 GNUNET_free (plug->short_name);
4827 while (NULL != (al = plug->addresses))
4829 plug->addresses = al->next;
4834 if (my_private_key != NULL)
4835 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4836 GNUNET_free_non_null (our_hello);
4838 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
4841 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4842 validation_map = NULL;
4844 /* free 'chvc' data structure */
4845 while (NULL != (chvc = chvc_head))
4847 chvc_head = chvc->next;
4848 if (chvc->piter != NULL)
4849 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
4852 GNUNET_assert (chvc->ve_count == 0);
4859 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4862 if (peerinfo != NULL)
4864 GNUNET_PEERINFO_disconnect (peerinfo);
4867 /* Can we assume those are gone by now, or do we need to clean up
4869 GNUNET_break (bl_head == NULL);
4870 GNUNET_break (bc_head == NULL);
4875 * Initiate transport service.
4877 * @param cls closure
4878 * @param s scheduler to use
4879 * @param server the initialized server
4880 * @param c configuration to use
4884 struct GNUNET_SCHEDULER_Handle *s,
4885 struct GNUNET_SERVER_Handle *server,
4886 const struct GNUNET_CONFIGURATION_Handle *c)
4888 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4889 {&handle_start, NULL,
4890 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
4891 {&handle_hello, NULL,
4892 GNUNET_MESSAGE_TYPE_HELLO, 0},
4893 {&handle_send, NULL,
4894 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
4895 {&handle_set_quota, NULL,
4896 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
4897 {&handle_address_lookup, NULL,
4898 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
4900 {&handle_blacklist_init, NULL,
4901 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
4902 {&handle_blacklist_reply, NULL,
4903 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
4909 unsigned long long tneigh;
4914 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
4915 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
4916 /* parse configuration */
4918 GNUNET_CONFIGURATION_get_value_number (c,
4923 GNUNET_CONFIGURATION_get_value_filename (c,
4925 "HOSTKEY", &keyfile)))
4927 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4929 ("Transport service is lacking key configuration settings. Exiting.\n"));
4930 GNUNET_SCHEDULER_shutdown (s);
4933 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4936 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4937 validation_map = NULL;
4940 max_connect_per_transport = (uint32_t) tneigh;
4941 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
4942 if (peerinfo == NULL)
4944 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4945 _("Could not access PEERINFO service. Exiting.\n"));
4946 GNUNET_SCHEDULER_shutdown (s);
4949 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4952 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4953 validation_map = NULL;
4954 GNUNET_free (keyfile);
4957 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4958 GNUNET_free (keyfile);
4959 if (my_private_key == NULL)
4961 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4963 ("Transport service could not access hostkey. Exiting.\n"));
4964 GNUNET_SCHEDULER_shutdown (s);
4967 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4970 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4971 validation_map = NULL;
4974 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4975 GNUNET_CRYPTO_hash (&my_public_key,
4976 sizeof (my_public_key), &my_identity.hashPubKey);
4977 /* setup notification */
4978 GNUNET_SERVER_disconnect_notify (server,
4979 &client_disconnect_notification, NULL);
4980 /* load plugins... */
4983 GNUNET_CONFIGURATION_get_value_string (c,
4984 "TRANSPORT", "PLUGINS", &plugs))
4986 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4987 _("Starting transport plugins `%s'\n"), plugs);
4988 pos = strtok (plugs, " ");
4991 start_transport (server, pos);
4993 pos = strtok (NULL, " ");
4995 GNUNET_free (plugs);
4997 GNUNET_SCHEDULER_add_delayed (sched,
4998 GNUNET_TIME_UNIT_FOREVER_REL,
4999 &shutdown_task, NULL);
5004 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5006 /* If we have a blacklist file, read from it */
5007 read_blacklist_file(cfg);
5008 /* process client requests */
5009 GNUNET_SERVER_add_handlers (server, handlers);
5014 * The main function for the transport service.
5016 * @param argc number of arguments from the command line
5017 * @param argv command line arguments
5018 * @return 0 ok, 1 on error
5021 main (int argc, char *const *argv)
5023 a2s (NULL, NULL, 0); /* make compiler happy */
5024 return (GNUNET_OK ==
5025 GNUNET_SERVICE_run (argc,
5028 GNUNET_SERVICE_OPTION_NONE,
5029 &run, NULL)) ? 0 : 1;
5032 /* end of gnunet-service-transport.c */