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 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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_YES
44 #define DEBUG_PING_PONG GNUNET_YES
46 #define DEBUG_TRANSPORT_HELLO GNUNET_YES
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 * How long is a PONG signature valid? We'll recycle a signature until
105 * 1/4 of this time is remaining. PONGs should expire so that if our
106 * external addresses change an adversary cannot replay them indefinitely.
107 * OTOH, we don't want to spend too much time generating PONG signatures,
108 * so they must have some lifetime to reduce our CPU usage.
110 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
113 * Priority to use for PONG messages.
115 #define TRANSPORT_PONG_PRIORITY 4
118 * How often do we re-add (cheaper) plugins to our list of plugins
119 * to try for a given connected peer?
121 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
124 * After how long do we expire an address in a HELLO that we just
125 * validated? This value is also used for our own addresses when we
128 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
132 * How long before an existing address expires should we again try to
133 * validate it? Must be (significantly) smaller than
134 * HELLO_ADDRESS_EXPIRATION.
136 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
139 * Maximum frequency for re-evaluating latencies for all transport addresses.
141 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
144 * Maximum frequency for re-evaluating latencies for connected addresses.
146 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
150 * List of addresses of other peers
152 struct ForeignAddressList
155 * This is a linked list.
157 struct ForeignAddressList *next;
160 * Which ready list does this entry belong to.
162 struct ReadyList *ready_list;
165 * How long until we auto-expire this address (unless it is
166 * re-confirmed by the transport)?
168 struct GNUNET_TIME_Absolute expires;
171 * Task used to re-validate addresses, updates latencies and
174 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
182 * Session (or NULL if no valid session currently exists or if the
183 * plugin does not use sessions).
185 struct Session *session;
188 * What was the last latency observed for this address, plugin and peer?
190 struct GNUNET_TIME_Relative latency;
193 * If we did not successfully transmit a message to the given peer
194 * via this connection during the specified time, we should consider
195 * the connection to be dead. This is used in the case that a TCP
196 * transport simply stalls writing to the stream but does not
197 * formerly get a signal that the other peer died.
199 struct GNUNET_TIME_Absolute timeout;
202 * How often have we tried to connect using this plugin? Used to
203 * discriminate against addresses that do not work well.
204 * FIXME: not yet used, but should be!
206 unsigned int connect_attempts;
209 * DV distance to this peer (1 if no DV is used).
210 * FIXME: need to set this from transport plugins!
220 * Have we ever estimated the latency of this address? Used to
221 * ensure that the first time we add an address, we immediately
227 * Are we currently connected via this address? The first time we
228 * successfully transmit or receive data to a peer via a particular
229 * address, we set this to GNUNET_YES. If we later get an error
230 * (disconnect notification, transmission failure, timeout), we set
231 * it back to GNUNET_NO.
236 * Is this plugin currently busy transmitting to the specific target?
237 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
238 * messages do not count as 'in transmit'.
243 * Has this address been validated yet?
251 * Entry in linked list of network addresses for ourselves. Also
252 * includes a cached signature for 'struct TransportPongMessage's.
254 struct OwnAddressList
257 * This is a linked list.
259 struct OwnAddressList *next;
262 * How long until we actually auto-expire this address (unless it is
263 * re-confirmed by the transport)?
265 struct GNUNET_TIME_Absolute expires;
268 * How long until the current signature expires? (ZERO if the
269 * signature was never created).
271 struct GNUNET_TIME_Absolute pong_sig_expires;
274 * Signature for a 'struct TransportPongMessage' for this address.
276 struct GNUNET_CRYPTO_RsaSignature pong_signature;
287 * Entry in linked list of all of our plugins.
289 struct TransportPlugin
293 * This is a linked list.
295 struct TransportPlugin *next;
298 * API of the transport as returned by the plugin's
299 * initialization function.
301 struct GNUNET_TRANSPORT_PluginFunctions *api;
304 * Short name for the plugin (i.e. "tcp").
309 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
314 * List of our known addresses for this transport.
316 struct OwnAddressList *addresses;
319 * Environment this transport service is using
322 struct GNUNET_TRANSPORT_PluginEnvironment env;
325 * ID of task that is used to clean up expired addresses.
327 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
330 * Set to GNUNET_YES if we need to scrap the existing list of
331 * "addresses" and start fresh when we receive the next address
332 * update from a transport. Set to GNUNET_NO if we should just add
333 * the new address to the list and wait for the commit call.
338 * Hashmap of blacklisted peers for this particular transport.
340 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
343 struct NeighbourList;
346 * For each neighbour we keep a list of messages
347 * that we still want to transmit to the neighbour.
353 * This is a doubly linked list.
355 struct MessageQueue *next;
358 * This is a doubly linked list.
360 struct MessageQueue *prev;
363 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
364 * stuck together in memory. Allocated at the end of this struct.
366 const char *message_buf;
369 * Size of the message buf
371 size_t message_buf_size;
374 * Client responsible for queueing the message;
375 * used to check that a client has no two messages
376 * pending for the same target. Can be NULL.
378 struct TransportClient *client;
381 * Using which specific address should we send this message?
383 struct ForeignAddressList *specific_address;
386 * Peer ID of the Neighbour this entry belongs to.
388 struct GNUNET_PeerIdentity neighbour_id;
391 * Plugin that we used for the transmission.
392 * NULL until we scheduled a transmission.
394 struct TransportPlugin *plugin;
397 * At what time should we fail?
399 struct GNUNET_TIME_Absolute timeout;
402 * Internal message of the transport system that should not be
403 * included in the usual SEND-SEND_OK transmission confirmation
404 * traffic management scheme. Typically, "internal_msg" will
405 * be set whenever "client" is NULL (but it is not strictly
411 * How important is the message?
413 unsigned int priority;
419 * For a given Neighbour, which plugins are available
420 * to talk to this peer and what are their costs?
425 * This is a linked list.
427 struct ReadyList *next;
430 * Which of our transport plugins does this entry
433 struct TransportPlugin *plugin;
436 * Transport addresses, latency, and readiness for
437 * this particular plugin.
439 struct ForeignAddressList *addresses;
442 * To which neighbour does this ready list belong to?
444 struct NeighbourList *neighbour;
450 * Entry in linked list of all of our current neighbours.
456 * This is a linked list.
458 struct NeighbourList *next;
461 * Which of our transports is connected to this peer
462 * and what is their status?
464 struct ReadyList *plugins;
467 * Head of list of messages we would like to send to this peer;
468 * must contain at most one message per client.
470 struct MessageQueue *messages_head;
473 * Tail of list of messages we would like to send to this peer; must
474 * contain at most one message per client.
476 struct MessageQueue *messages_tail;
479 * Buffer for at most one payload message used when we receive
480 * payload data before our PING-PONG has succeeded. We then
481 * store such messages in this intermediary buffer until the
482 * connection is fully up.
484 struct GNUNET_MessageHeader *pre_connect_message_buffer;
487 * Context for peerinfo iteration.
488 * NULL after we are done processing peerinfo's information.
490 struct GNUNET_PEERINFO_IteratorContext *piter;
493 * Public key for this peer. Valid only if the respective flag is set below.
495 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
498 * Identity of this neighbour.
500 struct GNUNET_PeerIdentity id;
503 * ID of task scheduled to run when this peer is about to
504 * time out (will free resources associated with the peer).
506 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
509 * ID of task scheduled to run when we should retry transmitting
510 * the head of the message queue. Actually triggered when the
511 * transmission is timing out (we trigger instantly when we have
512 * a chance of success).
514 GNUNET_SCHEDULER_TaskIdentifier retry_task;
517 * How long until we should consider this peer dead
518 * (if we don't receive another message in the
521 struct GNUNET_TIME_Absolute peer_timeout;
524 * Tracker for inbound bandwidth.
526 struct GNUNET_BANDWIDTH_Tracker in_tracker;
529 * The latency we have seen for this particular address for
530 * this particular peer. This latency may have been calculated
531 * over multiple transports. This value reflects how long it took
532 * us to receive a response when SENDING via this particular
533 * transport/neighbour/address combination!
535 * FIXME: we need to periodically send PINGs to update this
536 * latency (at least more often than the current "huge" (11h?)
539 struct GNUNET_TIME_Relative latency;
542 * How often has the other peer (recently) violated the
543 * inbound traffic limit? Incremented by 10 per violation,
544 * decremented by 1 per non-violation (for each
547 unsigned int quota_violation_count;
550 * DV distance to this peer (1 if no DV is used).
555 * Have we seen an PONG from this neighbour in the past (and
556 * not had a disconnect since)?
561 * Do we have a valid public key for this neighbour?
563 int public_key_valid;
568 * Message used to ask a peer to validate receipt (to check an address
569 * from a HELLO). Followed by the address we are trying to validate,
570 * or an empty address if we are just sending a PING to confirm that a
571 * connection which the receiver (of the PING) initiated is still valid.
573 struct TransportPingMessage
577 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
579 struct GNUNET_MessageHeader header;
582 * Challenge code (to ensure fresh reply).
584 uint32_t challenge GNUNET_PACKED;
587 * Who is the intended recipient?
589 struct GNUNET_PeerIdentity target;
595 * Message used to validate a HELLO. The challenge is included in the
596 * confirmation to make matching of replies to requests possible. The
597 * signature signs our public key, an expiration time and our address.<p>
599 * This message is followed by our transport address that the PING tried
600 * to confirm (if we liked it). The address can be empty (zero bytes)
601 * if the PING had not address either (and we received the request via
602 * a connection that we initiated).
604 struct TransportPongMessage
608 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
610 struct GNUNET_MessageHeader header;
613 * Challenge code from PING (showing freshness). Not part of what
614 * is signed so that we can re-use signatures.
616 uint32_t challenge GNUNET_PACKED;
621 struct GNUNET_CRYPTO_RsaSignature signature;
624 * What are we signing and why? Two possible reason codes can be here:
625 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
626 * plausible address for this peer (pid is set to identity of signer); or
627 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
628 * an address we used to connect to the peer with the given pid.
630 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
633 * When does this signature expire?
635 struct GNUNET_TIME_AbsoluteNBO expiration;
638 * Either the identity of the peer Who signed this message, or the
639 * identity of the peer that we're connected to using the given
640 * address (depending on purpose.type).
642 struct GNUNET_PeerIdentity pid;
645 * Size of address appended to this message (part of what is
646 * being signed, hence not redundant).
654 * Linked list of messages to be transmitted to the client. Each
655 * entry is followed by the actual message.
657 struct ClientMessageQueueEntry
660 * This is a doubly-linked list.
662 struct ClientMessageQueueEntry *next;
665 * This is a doubly-linked list.
667 struct ClientMessageQueueEntry *prev;
672 * Client connected to the transport service.
674 struct TransportClient
678 * This is a linked list.
680 struct TransportClient *next;
683 * Handle to the client.
685 struct GNUNET_SERVER_Client *client;
688 * Linked list of messages yet to be transmitted to
691 struct ClientMessageQueueEntry *message_queue_head;
694 * Tail of linked list of messages yet to be transmitted to the
697 struct ClientMessageQueueEntry *message_queue_tail;
700 * Current transmit request handle.
702 struct GNUNET_CONNECTION_TransmitHandle *th;
705 * Is a call to "transmit_send_continuation" pending? If so, we
706 * must not free this struct (even if the corresponding client
707 * disconnects) and instead only remove it from the linked list and
708 * set the "client" field to NULL.
713 * Length of the list of messages pending for this client.
715 unsigned int message_count;
721 * Context of currently active requests to peerinfo
722 * for validation of HELLOs.
724 struct CheckHelloValidatedContext;
728 * Entry in map of all HELLOs awaiting validation.
730 struct ValidationEntry
734 * NULL if this entry is not part of a larger HELLO validation.
736 struct CheckHelloValidatedContext *chvc;
739 * The address, actually a pointer to the end
740 * of this struct. Do not free!
745 * Name of the transport.
747 char *transport_name;
750 * The public key of the peer.
752 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
755 * ID of task that will clean up this entry if we don't succeed
756 * with the validation first.
758 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
761 * At what time did we send this validation?
763 struct GNUNET_TIME_Absolute send_time;
766 * Session being validated (or NULL for none).
768 struct Session *session;
771 * Challenge number we used.
784 * Context of currently active requests to peerinfo
785 * for validation of HELLOs.
787 struct CheckHelloValidatedContext
791 * This is a doubly-linked list.
793 struct CheckHelloValidatedContext *next;
796 * This is a doubly-linked list.
798 struct CheckHelloValidatedContext *prev;
801 * Hello that we are validating.
803 const struct GNUNET_HELLO_Message *hello;
806 * Context for peerinfo iteration.
807 * NULL after we are done processing peerinfo's information.
809 struct GNUNET_PEERINFO_IteratorContext *piter;
812 * Was a HELLO known for this peer to peerinfo?
817 * Number of validation entries currently referring to this
820 unsigned int ve_count;
828 static struct GNUNET_HELLO_Message *our_hello;
833 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
838 static struct GNUNET_PeerIdentity my_identity;
843 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
848 struct GNUNET_SCHEDULER_Handle *sched;
853 const struct GNUNET_CONFIGURATION_Handle *cfg;
856 * Linked list of all clients to this service.
858 static struct TransportClient *clients;
861 * All loaded plugins.
863 static struct TransportPlugin *plugins;
866 * Handle to peerinfo service.
868 static struct GNUNET_PEERINFO_Handle *peerinfo;
871 * All known neighbours and their HELLOs.
873 static struct NeighbourList *neighbours;
876 * Number of neighbours we'd like to have.
878 static uint32_t max_connect_per_transport;
881 * Head of linked list.
883 static struct CheckHelloValidatedContext *chvc_head;
886 * Tail of linked list.
888 static struct CheckHelloValidatedContext *chvc_tail;
891 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
892 * of the given peer that we are currently validating).
894 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
897 * Handle for reporting statistics.
899 static struct GNUNET_STATISTICS_Handle *stats;
902 * The peer specified by the given neighbour has timed-out or a plugin
903 * has disconnected. We may either need to do nothing (other plugins
904 * still up), or trigger a full disconnect and clean up. This
905 * function updates our state and do the necessary notifications.
906 * Also notifies our clients that the neighbour is now officially
909 * @param n the neighbour list entry for the peer
910 * @param check should we just check if all plugins
911 * disconnected or must we ask all plugins to
914 static void disconnect_neighbour (struct NeighbourList *n, int check);
917 * Check the ready list for the given neighbour and if a plugin is
918 * ready for transmission (and if we have a message), do so!
920 * @param neighbour target peer for which to transmit
922 static void try_transmission_to_peer (struct NeighbourList *neighbour);
926 * Find an entry in the neighbour list for a particular peer.
928 * @return NULL if not found.
930 static struct NeighbourList *
931 find_neighbour (const struct GNUNET_PeerIdentity *key)
933 struct NeighbourList *head = neighbours;
935 while ((head != NULL) &&
936 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
943 * Find an entry in the transport list for a particular transport.
945 * @return NULL if not found.
947 static struct TransportPlugin *
948 find_transport (const char *short_name)
950 struct TransportPlugin *head = plugins;
951 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
957 * Is a particular peer blacklisted for a particular transport?
959 * @param peer the peer to check for
960 * @param plugin the plugin used to connect to the peer
962 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
965 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
968 if (plugin->blacklist != NULL)
970 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
974 _("Peer `%s:%s' is blacklisted!\n"),
975 plugin->short_name, GNUNET_i2s (peer));
986 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
988 struct TransportPlugin *plugin;
990 plugin = find_transport(transport_name);
991 if (plugin == NULL) /* Nothing to do */
993 if (plugin->blacklist == NULL)
994 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
995 GNUNET_assert(plugin->blacklist != NULL);
996 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
998 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
1003 * Read the blacklist file, containing transport:peer entries.
1004 * Provided the transport is loaded, set up hashmap with these
1005 * entries to blacklist peers by transport.
1009 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1016 struct GNUNET_PeerIdentity pid;
1018 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1019 unsigned int entries_found;
1020 char *transport_name;
1023 GNUNET_CONFIGURATION_get_value_filename (cfg,
1029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1030 _("Option `%s' in section `%s' not specified!\n"),
1036 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1037 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1038 | GNUNET_DISK_PERM_USER_WRITE);
1039 if (0 != STAT (fn, &frstat))
1041 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1042 _("Could not read blacklist file `%s'\n"), fn);
1046 if (frstat.st_size == 0)
1049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1050 _("Blacklist file `%s' is empty.\n"),
1056 /* FIXME: use mmap */
1057 data = GNUNET_malloc_large (frstat.st_size);
1058 GNUNET_assert(data != NULL);
1059 if (frstat.st_size !=
1060 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1062 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1063 _("Failed to read blacklist from `%s'\n"), fn);
1070 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1072 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1073 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1076 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1079 if (colon_pos >= frstat.st_size)
1081 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1082 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1083 (unsigned long long) colon_pos);
1089 if (isspace( (unsigned char) data[colon_pos]))
1091 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1092 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1093 (unsigned long long) colon_pos);
1095 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1099 tsize = colon_pos - pos;
1100 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1102 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1103 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1104 (unsigned long long) colon_pos);
1113 transport_name = GNUNET_malloc(tsize + 1);
1114 memcpy(transport_name, &data[pos], tsize);
1115 pos = colon_pos + 1;
1117 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1118 _("Read transport name %s in blacklist file.\n"),
1121 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1122 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1124 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1125 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1126 (unsigned long long) pos);
1128 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1130 GNUNET_free_non_null(transport_name);
1133 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1134 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1136 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1137 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1138 (unsigned long long) pos,
1143 if (0 != memcmp (&pid,
1145 sizeof (struct GNUNET_PeerIdentity)))
1148 add_peer_to_blacklist (&pid,
1153 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1154 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1158 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1159 GNUNET_free_non_null(transport_name);
1160 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1169 * Function called to notify a client about the socket being ready to
1170 * queue more data. "buf" will be NULL and "size" zero if the socket
1171 * was closed for writing in the meantime.
1173 * @param cls closure
1174 * @param size number of bytes available in buf
1175 * @param buf where the callee should write the message
1176 * @return number of bytes written to buf
1179 transmit_to_client_callback (void *cls, size_t size, void *buf)
1181 struct TransportClient *client = cls;
1182 struct ClientMessageQueueEntry *q;
1185 const struct GNUNET_MessageHeader *msg;
1191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1192 "Transmission to client failed, closing connection.\n");
1193 /* fatal error with client, free message queue! */
1194 while (NULL != (q = client->message_queue_head))
1196 GNUNET_STATISTICS_update (stats,
1197 gettext_noop ("# bytes discarded (could not transmit to client)"),
1198 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1200 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1201 client->message_queue_tail,
1205 client->message_count = 0;
1210 while (NULL != (q = client->message_queue_head))
1212 msg = (const struct GNUNET_MessageHeader *) &q[1];
1213 msize = ntohs (msg->size);
1214 if (msize + tsize > size)
1217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1218 "Transmitting message of type %u to client.\n",
1221 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1222 client->message_queue_tail,
1224 memcpy (&cbuf[tsize], msg, msize);
1227 client->message_count--;
1231 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1232 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1234 GNUNET_TIME_UNIT_FOREVER_REL,
1235 &transmit_to_client_callback,
1237 GNUNET_assert (client->th != NULL);
1244 * Convert an address to a string.
1246 * @param plugin name of the plugin responsible for the address
1247 * @param addr binary address
1248 * @param addr_len number of bytes in addr
1249 * @return NULL on error, otherwise address string
1252 a2s (const char *plugin,
1256 struct TransportPlugin *p;
1260 p = find_transport (plugin);
1263 return p->api->address_to_string (p->api->cls,
1270 * Mark the given FAL entry as 'connected' (and hence preferred for
1271 * sending); also mark all others for the same peer as 'not connected'
1272 * (since only one can be preferred).
1274 * @param fal address to set to 'connected'
1277 mark_address_connected (struct ForeignAddressList *fal)
1279 struct ForeignAddressList *pos;
1282 GNUNET_assert (GNUNET_YES == fal->validated);
1283 if (fal->connected == GNUNET_YES)
1284 return; /* nothing to do */
1286 pos = fal->ready_list->addresses;
1289 if (GNUNET_YES == pos->connected)
1292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1293 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1294 a2s (pos->ready_list->plugin->short_name,
1298 GNUNET_break (cnt == GNUNET_YES);
1300 pos->connected = GNUNET_NO;
1301 GNUNET_STATISTICS_update (stats,
1302 gettext_noop ("# connected addresses"),
1308 fal->connected = GNUNET_YES;
1309 if (GNUNET_YES == cnt)
1311 GNUNET_STATISTICS_update (stats,
1312 gettext_noop ("# connected addresses"),
1320 * Send the specified message to the specified client. Since multiple
1321 * messages may be pending for the same client at a time, this code
1322 * makes sure that no message is lost.
1324 * @param client client to transmit the message to
1325 * @param msg the message to send
1326 * @param may_drop can this message be dropped if the
1327 * message queue for this client is getting far too large?
1330 transmit_to_client (struct TransportClient *client,
1331 const struct GNUNET_MessageHeader *msg, int may_drop)
1333 struct ClientMessageQueueEntry *q;
1336 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1338 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1340 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1343 client->message_count,
1345 GNUNET_STATISTICS_update (stats,
1346 gettext_noop ("# messages dropped due to slow client"),
1351 msize = ntohs (msg->size);
1352 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1353 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1354 memcpy (&q[1], msg, msize);
1355 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1356 client->message_queue_tail,
1357 client->message_queue_tail,
1359 client->message_count++;
1360 if (client->th == NULL)
1362 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1364 GNUNET_TIME_UNIT_FOREVER_REL,
1365 &transmit_to_client_callback,
1367 GNUNET_assert (client->th != NULL);
1373 * Transmit a 'SEND_OK' notification to the given client for the
1376 * @param client who to notify
1377 * @param n neighbour to notify about
1378 * @param result status code for the transmission request
1381 transmit_send_ok (struct TransportClient *client,
1382 struct NeighbourList *n,
1385 struct SendOkMessage send_ok_msg;
1387 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1388 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1389 send_ok_msg.success = htonl (result);
1390 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1391 send_ok_msg.peer = n->id;
1392 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1397 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1398 * upon "completion" of a send request. This tells the API
1399 * that it is now legal to send another message to the given
1402 * @param cls closure, identifies the entry on the
1403 * message queue that was transmitted and the
1404 * client responsible for queueing the message
1405 * @param target the peer receiving the message
1406 * @param result GNUNET_OK on success, if the transmission
1407 * failed, we should not tell the client to transmit
1411 transmit_send_continuation (void *cls,
1412 const struct GNUNET_PeerIdentity *target,
1415 struct MessageQueue *mq = cls;
1416 struct NeighbourList *n;
1418 GNUNET_STATISTICS_update (stats,
1419 gettext_noop ("# bytes pending with plugins"),
1420 - (int64_t) mq->message_buf_size,
1422 if (result == GNUNET_OK)
1424 GNUNET_STATISTICS_update (stats,
1425 gettext_noop ("# bytes successfully transmitted by plugins"),
1426 mq->message_buf_size,
1431 GNUNET_STATISTICS_update (stats,
1432 gettext_noop ("# bytes with transmission failure by plugins"),
1433 mq->message_buf_size,
1436 n = find_neighbour(&mq->neighbour_id);
1437 GNUNET_assert (n != NULL);
1438 if (mq->specific_address != NULL)
1440 if (result == GNUNET_OK)
1442 mq->specific_address->timeout =
1443 GNUNET_TIME_relative_to_absolute
1444 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1445 if (mq->specific_address->validated == GNUNET_YES)
1446 mark_address_connected (mq->specific_address);
1450 if (mq->specific_address->connected != GNUNET_NO)
1453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1454 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1455 a2s (mq->specific_address->ready_list->plugin->short_name,
1456 mq->specific_address->addr,
1457 mq->specific_address->addrlen));
1459 GNUNET_STATISTICS_update (stats,
1460 gettext_noop ("# connected addresses"),
1463 mq->specific_address->connected = GNUNET_NO;
1466 if (! mq->internal_msg)
1467 mq->specific_address->in_transmit = GNUNET_NO;
1469 if (mq->client != NULL)
1470 transmit_send_ok (mq->client, n, result);
1472 try_transmission_to_peer (n);
1477 * Find an address in any of the available transports for
1478 * the given neighbour that would be good for message
1479 * transmission. This is essentially the transport selection
1482 * @param neighbour for whom to select an address
1483 * @return selected address, NULL if we have none
1485 struct ForeignAddressList *
1486 find_ready_address(struct NeighbourList *neighbour)
1488 struct ReadyList *head = neighbour->plugins;
1489 struct ForeignAddressList *addresses;
1490 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1491 struct ForeignAddressList *best_address;
1493 best_address = NULL;
1494 while (head != NULL)
1496 addresses = head->addresses;
1497 while (addresses != NULL)
1499 if ( (addresses->timeout.abs_value < now.abs_value) &&
1500 (addresses->connected == GNUNET_YES) )
1503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1504 "Marking long-time inactive connection to `%4s' as down.\n",
1505 GNUNET_i2s (&neighbour->id));
1507 GNUNET_STATISTICS_update (stats,
1508 gettext_noop ("# connected addresses"),
1511 addresses->connected = GNUNET_NO;
1513 addresses = addresses->next;
1516 addresses = head->addresses;
1517 while (addresses != NULL)
1519 #if DEBUG_TRANSPORT > 1
1520 if (addresses->addr != NULL)
1521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1522 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1523 a2s (head->plugin->short_name,
1525 addresses->addrlen),
1526 GNUNET_i2s (&neighbour->id),
1527 addresses->connected,
1528 addresses->in_transmit,
1529 addresses->validated,
1530 addresses->connect_attempts,
1531 (unsigned long long) addresses->timeout.abs_value,
1532 (unsigned int) addresses->distance);
1534 if ( ( (best_address == NULL) ||
1535 (addresses->connected == GNUNET_YES) ||
1536 (best_address->connected == GNUNET_NO) ) &&
1537 (addresses->in_transmit == GNUNET_NO) &&
1538 ( (best_address == NULL) ||
1539 (addresses->latency.rel_value < best_address->latency.rel_value)) )
1540 best_address = addresses;
1541 /* FIXME: also give lower-latency addresses that are not
1542 connected a chance some times... */
1543 addresses = addresses->next;
1547 if (best_address != NULL)
1550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1551 "Best address found (`%s') has latency of %llu ms.\n",
1552 (best_address->addrlen > 0)
1553 ? a2s (best_address->ready_list->plugin->short_name,
1555 best_address->addrlen)
1557 best_address->latency.rel_value);
1562 GNUNET_STATISTICS_update (stats,
1563 gettext_noop ("# transmission attempts failed (no address)"),
1567 return best_address;
1573 * We should re-try transmitting to the given peer,
1574 * hopefully we've learned something in the meantime.
1577 retry_transmission_task (void *cls,
1578 const struct GNUNET_SCHEDULER_TaskContext *tc)
1580 struct NeighbourList *n = cls;
1582 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1583 try_transmission_to_peer (n);
1588 * Check the ready list for the given neighbour and if a plugin is
1589 * ready for transmission (and if we have a message), do so!
1591 * @param neighbour target peer for which to transmit
1594 try_transmission_to_peer (struct NeighbourList *neighbour)
1596 struct ReadyList *rl;
1597 struct MessageQueue *mq;
1598 struct GNUNET_TIME_Relative timeout;
1602 if (neighbour->messages_head == NULL)
1605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1606 "Transmission queue for `%4s' is empty\n",
1607 GNUNET_i2s (&neighbour->id));
1609 return; /* nothing to do */
1612 mq = neighbour->messages_head;
1613 force_address = GNUNET_YES;
1614 if (mq->specific_address == NULL)
1616 mq->specific_address = find_ready_address(neighbour);
1617 GNUNET_STATISTICS_update (stats,
1618 gettext_noop ("# transport selected peer address freely"),
1621 force_address = GNUNET_NO;
1623 if (mq->specific_address == NULL)
1625 GNUNET_STATISTICS_update (stats,
1626 gettext_noop ("# transport failed to selected peer address"),
1629 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1630 if (timeout.rel_value == 0)
1633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1634 "No destination address available to transmit message of size %u to peer `%4s'\n",
1635 mq->message_buf_size,
1636 GNUNET_i2s (&mq->neighbour_id));
1638 GNUNET_STATISTICS_update (stats,
1639 gettext_noop ("# bytes in message queue for other peers"),
1640 - (int64_t) mq->message_buf_size,
1642 GNUNET_STATISTICS_update (stats,
1643 gettext_noop ("# bytes discarded (no destination address available)"),
1644 mq->message_buf_size,
1646 if (mq->client != NULL)
1647 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1648 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1649 neighbour->messages_tail,
1652 return; /* nobody ready */
1654 GNUNET_STATISTICS_update (stats,
1655 gettext_noop ("# message delivery deferred (no address)"),
1658 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1659 GNUNET_SCHEDULER_cancel (sched,
1660 neighbour->retry_task);
1661 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1663 &retry_transmission_task,
1666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1667 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1668 mq->message_buf_size,
1669 GNUNET_i2s (&mq->neighbour_id),
1672 /* FIXME: might want to trigger peerinfo lookup here
1673 (unless that's already pending...) */
1676 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1677 neighbour->messages_tail,
1679 if (mq->specific_address->connected == GNUNET_NO)
1680 mq->specific_address->connect_attempts++;
1681 rl = mq->specific_address->ready_list;
1682 mq->plugin = rl->plugin;
1683 if (!mq->internal_msg)
1684 mq->specific_address->in_transmit = GNUNET_YES;
1686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1687 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1688 mq->message_buf_size,
1689 GNUNET_i2s (&neighbour->id),
1690 (mq->specific_address->addr != NULL)
1691 ? a2s (mq->plugin->short_name,
1692 mq->specific_address->addr,
1693 mq->specific_address->addrlen)
1695 rl->plugin->short_name);
1697 GNUNET_STATISTICS_update (stats,
1698 gettext_noop ("# bytes in message queue for other peers"),
1699 - (int64_t) mq->message_buf_size,
1701 GNUNET_STATISTICS_update (stats,
1702 gettext_noop ("# bytes pending with plugins"),
1703 mq->message_buf_size,
1705 ret = rl->plugin->api->send (rl->plugin->api->cls,
1708 mq->message_buf_size,
1710 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1711 mq->specific_address->session,
1712 mq->specific_address->addr,
1713 mq->specific_address->addrlen,
1715 &transmit_send_continuation, mq);
1718 /* failure, but 'send' would not call continuation in this case,
1719 so we need to do it here! */
1720 transmit_send_continuation (mq,
1728 * Send the specified message to the specified peer.
1730 * @param client source of the transmission request (can be NULL)
1731 * @param peer_address ForeignAddressList where we should send this message
1732 * @param priority how important is the message
1733 * @param timeout how long do we have to transmit?
1734 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1735 * @param message_buf_size total size of all messages in message_buf
1736 * @param is_internal is this an internal message; these are pre-pended and
1737 * also do not count for plugins being "ready" to transmit
1738 * @param neighbour handle to the neighbour for transmission
1741 transmit_to_peer (struct TransportClient *client,
1742 struct ForeignAddressList *peer_address,
1743 unsigned int priority,
1744 struct GNUNET_TIME_Relative timeout,
1745 const char *message_buf,
1746 size_t message_buf_size,
1747 int is_internal, struct NeighbourList *neighbour)
1749 struct MessageQueue *mq;
1754 /* check for duplicate submission */
1755 mq = neighbour->messages_head;
1758 if (mq->client == client)
1760 /* client transmitted to same peer twice
1761 before getting SEND_OK! */
1769 GNUNET_STATISTICS_update (stats,
1770 gettext_noop ("# bytes in message queue for other peers"),
1773 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1774 mq->specific_address = peer_address;
1775 mq->client = client;
1776 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1777 memcpy (&mq[1], message_buf, message_buf_size);
1778 mq->message_buf = (const char*) &mq[1];
1779 mq->message_buf_size = message_buf_size;
1780 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1781 mq->internal_msg = is_internal;
1782 mq->priority = priority;
1783 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1785 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1786 neighbour->messages_tail,
1789 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1790 neighbour->messages_tail,
1791 neighbour->messages_tail,
1793 try_transmission_to_peer (neighbour);
1800 struct GeneratorContext
1802 struct TransportPlugin *plug_pos;
1803 struct OwnAddressList *addr_pos;
1804 struct GNUNET_TIME_Absolute expiration;
1812 address_generator (void *cls, size_t max, void *buf)
1814 struct GeneratorContext *gc = cls;
1817 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1819 gc->plug_pos = gc->plug_pos->next;
1820 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1822 if (NULL == gc->plug_pos)
1827 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1830 gc->addr_pos->addrlen, buf, max);
1831 gc->addr_pos = gc->addr_pos->next;
1837 * Construct our HELLO message from all of the addresses of
1838 * all of the transports.
1843 struct GNUNET_HELLO_Message *hello;
1844 struct TransportClient *cpos;
1845 struct NeighbourList *npos;
1846 struct GeneratorContext gc;
1848 gc.plug_pos = plugins;
1849 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1850 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1851 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1854 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1856 GNUNET_STATISTICS_update (stats,
1857 gettext_noop ("# refreshed my HELLO"),
1861 while (cpos != NULL)
1863 transmit_to_client (cpos,
1864 (const struct GNUNET_MessageHeader *) hello,
1869 GNUNET_free_non_null (our_hello);
1871 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1873 while (npos != NULL)
1876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1877 "Transmitting updated `%s' to neighbour `%4s'\n",
1878 "HELLO", GNUNET_i2s (&npos->id));
1880 GNUNET_STATISTICS_update (stats,
1881 gettext_noop ("# transmitted my HELLO to other peers"),
1884 transmit_to_peer (NULL, NULL, 0,
1885 HELLO_ADDRESS_EXPIRATION,
1886 (const char *) our_hello,
1887 GNUNET_HELLO_size(our_hello),
1895 * Task used to clean up expired addresses for a plugin.
1897 * @param cls closure
1901 expire_address_task (void *cls,
1902 const struct GNUNET_SCHEDULER_TaskContext *tc);
1906 * Update the list of addresses for this plugin,
1907 * expiring those that are past their expiration date.
1909 * @param plugin addresses of which plugin should be recomputed?
1910 * @param fresh set to GNUNET_YES if a new address was added
1911 * and we need to regenerate the HELLO even if nobody
1915 update_addresses (struct TransportPlugin *plugin, int fresh)
1917 static struct GNUNET_TIME_Absolute last_update;
1918 struct GNUNET_TIME_Relative min_remaining;
1919 struct GNUNET_TIME_Relative remaining;
1920 struct GNUNET_TIME_Absolute now;
1921 struct OwnAddressList *pos;
1922 struct OwnAddressList *prev;
1923 struct OwnAddressList *next;
1926 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1927 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1928 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1929 now = GNUNET_TIME_absolute_get ();
1930 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1931 expired = (GNUNET_TIME_absolute_get_duration (last_update).rel_value > (HELLO_ADDRESS_EXPIRATION.rel_value / 4));
1933 pos = plugin->addresses;
1937 if (pos->expires.abs_value < now.abs_value)
1939 expired = GNUNET_YES;
1941 plugin->addresses = pos->next;
1943 prev->next = pos->next;
1948 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1949 if (remaining.rel_value < min_remaining.rel_value)
1950 min_remaining = remaining;
1956 if (expired || fresh)
1961 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1962 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1964 plugin->address_update_task
1965 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1967 &expire_address_task, plugin);
1972 * Task used to clean up expired addresses for a plugin.
1974 * @param cls closure
1978 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1980 struct TransportPlugin *plugin = cls;
1982 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1983 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1984 update_addresses (plugin, GNUNET_NO);
1989 * Iterator over hash map entries that NULLs the session of validation
1990 * entries that match the given session.
1992 * @param cls closure (the 'struct Session*' to match against)
1993 * @param key current key code (peer ID, not used)
1994 * @param value value in the hash map ('struct ValidationEntry*')
1995 * @return GNUNET_YES (we should continue to iterate)
1998 remove_session_validations (void *cls,
1999 const GNUNET_HashCode * key,
2002 struct Session *session = cls;
2003 struct ValidationEntry *ve = value;
2005 if (session == ve->session)
2012 * We've been disconnected from the other peer (for some
2013 * connection-oriented transport). Either quickly
2014 * re-establish the connection or signal the disconnect
2017 * Only signal CORE level disconnect if ALL addresses
2018 * for the peer are exhausted.
2020 * @param p overall plugin context
2021 * @param nl neighbour that was disconnected
2024 try_fast_reconnect (struct TransportPlugin *p,
2025 struct NeighbourList *nl)
2027 /* FIXME-MW: fast reconnect / transport switching not implemented... */
2028 /* Note: the idea here is to hide problems with transports (or
2029 switching between plugins) from the core to eliminate the need to
2030 re-negotiate session keys and the like; OTOH, we should tell core
2031 quickly (much faster than timeout) `if a connection was lost and
2032 could not be re-established (i.e. other peer went down or is
2033 unable / refuses to communicate);
2035 So we should consider:
2036 1) ideally: our own willingness / need to connect
2037 2) prior failures to connect to this peer (by plugin)
2038 3) ideally: reasons why other peer terminated (as far as knowable)
2040 Most importantly, it must be POSSIBLE for another peer to terminate
2041 a connection for a while (without us instantly re-establishing it).
2042 Similarly, if another peer is gone we should quickly notify CORE.
2043 OTOH, if there was a minor glitch (i.e. crash of gnunet-service-transport
2044 on the other end), we should reconnect in such a way that BOTH CORE
2045 services never even notice.
2046 Furthermore, the same mechanism (or small variation) could be used
2047 to switch to a better-performing plugin (ATS).
2049 Finally, this needs to be tested throughly... */
2052 * GNUNET_NO in the call below makes transport disconnect the peer,
2053 * even if only a single address (out of say, six) went away. This
2054 * function must be careful to ONLY disconnect if the peer is gone,
2055 * not just a specifi address.
2057 * More specifically, half the places it was used had it WRONG.
2060 /* No reconnect, signal disconnect instead! */
2061 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2062 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2063 "try_fast_reconnect");
2064 disconnect_neighbour (nl, GNUNET_YES);
2069 * Function that will be called whenever the plugin internally
2070 * cleans up a session pointer and hence the service needs to
2071 * discard all of those sessions as well. Plugins that do not
2072 * use sessions can simply omit calling this function and always
2073 * use NULL wherever a session pointer is needed.
2075 * @param cls closure
2076 * @param peer which peer was the session for
2077 * @param session which session is being destoyed
2080 plugin_env_session_end (void *cls,
2081 const struct GNUNET_PeerIdentity *peer,
2082 struct Session *session)
2084 struct TransportPlugin *p = cls;
2085 struct NeighbourList *nl;
2086 struct ReadyList *rl;
2087 struct ForeignAddressList *pos;
2088 struct ForeignAddressList *prev;
2090 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2091 &remove_session_validations,
2093 nl = find_neighbour (peer);
2095 return; /* was never marked as connected */
2099 if (rl->plugin == p)
2104 return; /* was never marked as connected */
2106 pos = rl->addresses;
2107 while ( (pos != NULL) &&
2108 (pos->session != session) )
2114 return; /* was never marked as connected */
2115 pos->session = NULL;
2116 if (pos->addrlen != 0)
2118 if (nl->received_pong != GNUNET_NO)
2119 try_fast_reconnect (p, nl);
2122 /* was inbound connection, free 'pos' */
2124 rl->addresses = pos->next;
2126 prev->next = pos->next;
2127 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2129 GNUNET_SCHEDULER_cancel (sched,
2130 pos->revalidate_task);
2131 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2134 if (nl->received_pong == GNUNET_NO)
2135 return; /* nothing to do, never connected... */
2136 /* check if we have any validated addresses left */
2137 pos = rl->addresses;
2142 try_fast_reconnect (p, nl);
2147 /* no valid addresses left, signal disconnect! */
2149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2150 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2151 "plugin_env_session_end");
2152 /* FIXME: This doesn't mean there are no addresses left for this PEER,
2153 * it means there aren't any left for this PLUGIN/PEER combination! So
2154 * calling disconnect_neighbor here with GNUNET_NO forces disconnect
2155 * when it isn't necessary. Using GNUNET_YES at least checks to see
2156 * if there are any addresses that work first, so as not to overdo it.
2159 disconnect_neighbour (nl, GNUNET_YES);
2164 * Function that must be called by each plugin to notify the
2165 * transport service about the addresses under which the transport
2166 * provided by the plugin can be reached.
2168 * @param cls closure
2169 * @param name name of the transport that generated the address
2170 * @param addr one of the addresses of the host, NULL for the last address
2171 * the specific address format depends on the transport
2172 * @param addrlen length of the address
2173 * @param expires when should this address automatically expire?
2176 plugin_env_notify_address (void *cls,
2180 struct GNUNET_TIME_Relative expires)
2182 struct TransportPlugin *p = cls;
2183 struct OwnAddressList *al;
2184 struct GNUNET_TIME_Absolute abex;
2186 GNUNET_assert (addr != NULL);
2187 abex = GNUNET_TIME_relative_to_absolute (expires);
2188 GNUNET_assert (p == find_transport (name));
2192 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2194 if (al->expires.abs_value < abex.abs_value)
2201 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2202 al->next = p->addresses;
2205 al->addrlen = addrlen;
2206 memcpy (&al[1], addr, addrlen);
2207 update_addresses (p, GNUNET_YES);
2212 * Notify all of our clients about a peer connecting.
2215 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2216 struct GNUNET_TIME_Relative latency,
2219 struct ConnectInfoMessage cim;
2220 struct TransportClient *cpos;
2223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2224 "Notifying clients about connection from `%s'\n",
2227 GNUNET_STATISTICS_update (stats,
2228 gettext_noop ("# peers connected"),
2231 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2232 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2233 cim.distance = htonl (distance);
2234 cim.latency = GNUNET_TIME_relative_hton (latency);
2235 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2237 while (cpos != NULL)
2239 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2246 * Notify all of our clients about a peer disconnecting.
2249 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2251 struct DisconnectInfoMessage dim;
2252 struct TransportClient *cpos;
2255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2256 "Notifying clients about lost connection to `%s'\n",
2259 GNUNET_STATISTICS_update (stats,
2260 gettext_noop ("# peers connected"),
2263 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2264 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2265 dim.reserved = htonl (0);
2266 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2268 while (cpos != NULL)
2270 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2277 * Find a ForeignAddressList entry for the given neighbour
2278 * that matches the given address and transport.
2280 * @param neighbour which peer we care about
2281 * @param tname name of the transport plugin
2282 * @param session session to look for, NULL for 'any'; otherwise
2283 * can be used for the service to "learn" this session ID
2285 * @param addr binary address
2286 * @param addrlen length of addr
2287 * @return NULL if no such entry exists
2289 static struct ForeignAddressList *
2290 find_peer_address(struct NeighbourList *neighbour,
2292 struct Session *session,
2296 struct ReadyList *head;
2297 struct ForeignAddressList *pos;
2299 head = neighbour->plugins;
2300 while (head != NULL)
2302 if (0 == strcmp (tname, head->plugin->short_name))
2308 pos = head->addresses;
2309 while ( (pos != NULL) &&
2310 ( (pos->addrlen != addrlen) ||
2311 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2313 if ( (session != NULL) &&
2314 (pos->session == session) )
2318 if ( (session != NULL) && (pos != NULL) )
2319 pos->session = session; /* learn it! */
2325 * Get the peer address struct for the given neighbour and
2326 * address. If it doesn't yet exist, create it.
2328 * @param neighbour which peer we care about
2329 * @param tname name of the transport plugin
2330 * @param session session of the plugin, or NULL for none
2331 * @param addr binary address
2332 * @param addrlen length of addr
2333 * @return NULL if we do not have a transport plugin for 'tname'
2335 static struct ForeignAddressList *
2336 add_peer_address (struct NeighbourList *neighbour,
2338 struct Session *session,
2342 struct ReadyList *head;
2343 struct ForeignAddressList *ret;
2345 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2348 head = neighbour->plugins;
2350 while (head != NULL)
2352 if (0 == strcmp (tname, head->plugin->short_name))
2358 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2359 ret->session = session;
2362 ret->addr = (const char*) &ret[1];
2363 memcpy (&ret[1], addr, addrlen);
2369 ret->addrlen = addrlen;
2370 ret->expires = GNUNET_TIME_relative_to_absolute
2371 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2372 ret->latency = GNUNET_TIME_relative_get_forever();
2374 ret->timeout = GNUNET_TIME_relative_to_absolute
2375 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2376 ret->ready_list = head;
2377 ret->next = head->addresses;
2378 head->addresses = ret;
2384 * Closure for 'add_validated_address'.
2386 struct AddValidatedAddressContext
2389 * Entry that has been validated.
2391 const struct ValidationEntry *ve;
2394 * Flag set after we have added the address so
2395 * that we terminate the iteration next time.
2402 * Callback function used to fill a buffer of max bytes with a list of
2403 * addresses in the format used by HELLOs. Should use
2404 * "GNUNET_HELLO_add_address" as a helper function.
2406 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2407 * @param max maximum number of bytes that can be written to buf
2408 * @param buf where to write the address information
2409 * @return number of bytes written, 0 to signal the
2410 * end of the iteration.
2413 add_validated_address (void *cls,
2414 size_t max, void *buf)
2416 struct AddValidatedAddressContext *avac = cls;
2417 const struct ValidationEntry *ve = avac->ve;
2419 if (GNUNET_YES == avac->done)
2421 avac->done = GNUNET_YES;
2422 return GNUNET_HELLO_add_address (ve->transport_name,
2423 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2433 * Closure for 'check_address_exists'.
2435 struct CheckAddressExistsClosure
2438 * Address to check for.
2443 * Name of the transport.
2450 struct Session *session;
2453 * Set to GNUNET_YES if the address exists.
2466 * Iterator over hash map entries. Checks if the given
2467 * validation entry is for the same address as what is given
2470 * @param cls the 'struct CheckAddressExistsClosure*'
2471 * @param key current key code (ignored)
2472 * @param value value in the hash map ('struct ValidationEntry')
2473 * @return GNUNET_YES if we should continue to
2474 * iterate (mismatch), GNUNET_NO if not (entry matched)
2477 check_address_exists (void *cls,
2478 const GNUNET_HashCode * key,
2481 struct CheckAddressExistsClosure *caec = cls;
2482 struct ValidationEntry *ve = value;
2484 if ( (0 == strcmp (caec->tname,
2485 ve->transport_name)) &&
2486 (caec->addrlen == ve->addrlen) &&
2487 (0 == memcmp (caec->addr,
2491 caec->exists = GNUNET_YES;
2494 if ( (ve->session != NULL) &&
2495 (caec->session == ve->session) )
2497 caec->exists = GNUNET_YES;
2506 * Iterator to free entries in the validation_map.
2508 * @param cls closure (unused)
2509 * @param key current key code
2510 * @param value value in the hash map (validation to abort)
2511 * @return GNUNET_YES (always)
2514 abort_validation (void *cls,
2515 const GNUNET_HashCode * key,
2518 struct ValidationEntry *va = value;
2520 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2521 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
2522 GNUNET_free (va->transport_name);
2523 if (va->chvc != NULL)
2525 va->chvc->ve_count--;
2526 if (va->chvc->ve_count == 0)
2528 GNUNET_CONTAINER_DLL_remove (chvc_head,
2531 GNUNET_free (va->chvc);
2541 * HELLO validation cleanup task (validation failed).
2543 * @param cls the 'struct ValidationEntry' that failed
2544 * @param tc scheduler context (unused)
2547 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2549 struct ValidationEntry *va = cls;
2550 struct GNUNET_PeerIdentity pid;
2552 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2553 GNUNET_STATISTICS_update (stats,
2554 gettext_noop ("# address validation timeouts"),
2557 GNUNET_CRYPTO_hash (&va->publicKey,
2559 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2561 GNUNET_break (GNUNET_OK ==
2562 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2565 abort_validation (NULL, NULL, va);
2570 neighbour_timeout_task (void *cls,
2571 const struct GNUNET_SCHEDULER_TaskContext *tc)
2573 struct NeighbourList *n = cls;
2576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2577 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2579 GNUNET_STATISTICS_update (stats,
2580 gettext_noop ("# disconnects due to timeout"),
2583 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2584 disconnect_neighbour (n, GNUNET_NO);
2589 * Schedule the job that will cause us to send a PING to the
2590 * foreign address to evaluate its validity and latency.
2592 * @param fal address to PING
2595 schedule_next_ping (struct ForeignAddressList *fal);
2599 * Add the given address to the list of foreign addresses
2600 * available for the given peer (check for duplicates).
2602 * @param cls the respective 'struct NeighbourList' to update
2603 * @param tname name of the transport
2604 * @param expiration expiration time
2605 * @param addr the address
2606 * @param addrlen length of the address
2607 * @return GNUNET_OK (always)
2610 add_to_foreign_address_list (void *cls,
2612 struct GNUNET_TIME_Absolute expiration,
2616 struct NeighbourList *n = cls;
2617 struct ForeignAddressList *fal;
2620 GNUNET_STATISTICS_update (stats,
2621 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2625 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2628 #if DEBUG_TRANSPORT_HELLO
2629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2630 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2631 a2s (tname, addr, addrlen),
2633 GNUNET_i2s (&n->id),
2634 expiration.abs_value);
2636 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2639 GNUNET_STATISTICS_update (stats,
2640 gettext_noop ("# previously validated addresses lacking transport"),
2646 fal->expires = GNUNET_TIME_absolute_max (expiration,
2648 schedule_next_ping (fal);
2654 fal->expires = GNUNET_TIME_absolute_max (expiration,
2659 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2660 "Failed to add new address for `%4s'\n",
2661 GNUNET_i2s (&n->id));
2664 if (fal->validated == GNUNET_NO)
2666 fal->validated = GNUNET_YES;
2667 GNUNET_STATISTICS_update (stats,
2668 gettext_noop ("# peer addresses considered valid"),
2672 if (try == GNUNET_YES)
2674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2675 "Have new addresses, will try to trigger transmissions.\n");
2676 try_transmission_to_peer (n);
2683 * Add addresses in validated HELLO "h" to the set of addresses
2684 * we have for this peer.
2686 * @param cls closure ('struct NeighbourList*')
2687 * @param peer id of the peer, NULL for last call
2688 * @param h hello message for the peer (can be NULL)
2691 add_hello_for_peer (void *cls,
2692 const struct GNUNET_PeerIdentity *peer,
2693 const struct GNUNET_HELLO_Message *h)
2695 struct NeighbourList *n = cls;
2699 GNUNET_STATISTICS_update (stats,
2700 gettext_noop ("# outstanding peerinfo iterate requests"),
2707 return; /* no HELLO available */
2709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2710 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2714 if (GNUNET_YES != n->public_key_valid)
2716 GNUNET_HELLO_get_key (h, &n->publicKey);
2717 n->public_key_valid = GNUNET_YES;
2719 GNUNET_HELLO_iterate_addresses (h,
2721 &add_to_foreign_address_list,
2727 * Create a fresh entry in our neighbour list for the given peer.
2728 * Will try to transmit our current HELLO to the new neighbour.
2729 * Do not call this function directly, use 'setup_peer_check_blacklist.
2731 * @param peer the peer for which we create the entry
2732 * @param do_hello should we schedule transmitting a HELLO
2733 * @return the new neighbour list entry
2735 static struct NeighbourList *
2736 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2739 struct NeighbourList *n;
2740 struct TransportPlugin *tp;
2741 struct ReadyList *rl;
2744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2745 "Setting up state for neighbour `%4s'\n",
2748 GNUNET_assert (our_hello != NULL);
2749 GNUNET_STATISTICS_update (stats,
2750 gettext_noop ("# active neighbours"),
2753 n = GNUNET_malloc (sizeof (struct NeighbourList));
2754 n->next = neighbours;
2758 GNUNET_TIME_relative_to_absolute
2759 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2760 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2761 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2762 MAX_BANDWIDTH_CARRY_S);
2766 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2768 rl = GNUNET_malloc (sizeof (struct ReadyList));
2770 rl->next = n->plugins;
2773 rl->addresses = NULL;
2777 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2779 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2780 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2781 &neighbour_timeout_task, n);
2784 GNUNET_STATISTICS_update (stats,
2785 gettext_noop ("# peerinfo new neighbor iterate requests"),
2788 GNUNET_STATISTICS_update (stats,
2789 gettext_noop ("# outstanding peerinfo iterate requests"),
2792 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2793 GNUNET_TIME_UNIT_FOREVER_REL,
2794 &add_hello_for_peer, n);
2796 GNUNET_STATISTICS_update (stats,
2797 gettext_noop ("# HELLO's sent to new neighbors"),
2800 transmit_to_peer (NULL, NULL, 0,
2801 HELLO_ADDRESS_EXPIRATION,
2802 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2810 * Function called after we have checked if communicating
2811 * with a given peer is acceptable.
2813 * @param cls closure
2814 * @param n NULL if communication is not acceptable
2816 typedef void (*SetupContinuation)(void *cls,
2817 struct NeighbourList *n);
2821 * Information kept for each client registered to perform
2827 * This is a linked list.
2829 struct Blacklisters *next;
2832 * This is a linked list.
2834 struct Blacklisters *prev;
2837 * Client responsible for this entry.
2839 struct GNUNET_SERVER_Client *client;
2842 * Blacklist check that we're currently performing.
2844 struct BlacklistCheck *bc;
2850 * Head of DLL of blacklisting clients.
2852 static struct Blacklisters *bl_head;
2855 * Tail of DLL of blacklisting clients.
2857 static struct Blacklisters *bl_tail;
2861 * Context we use when performing a blacklist check.
2863 struct BlacklistCheck
2867 * This is a linked list.
2869 struct BlacklistCheck *next;
2872 * This is a linked list.
2874 struct BlacklistCheck *prev;
2877 * Peer being checked.
2879 struct GNUNET_PeerIdentity peer;
2882 * Option for setup neighbour afterwards.
2887 * Continuation to call with the result.
2889 SetupContinuation cont;
2897 * Current transmission request handle for this client, or NULL if no
2898 * request is pending.
2900 struct GNUNET_CONNECTION_TransmitHandle *th;
2903 * Our current position in the blacklisters list.
2905 struct Blacklisters *bl_pos;
2908 * Current task performing the check.
2910 GNUNET_SCHEDULER_TaskIdentifier task;
2915 * Head of DLL of active blacklisting queries.
2917 static struct BlacklistCheck *bc_head;
2920 * Tail of DLL of active blacklisting queries.
2922 static struct BlacklistCheck *bc_tail;
2926 * Perform next action in the blacklist check.
2928 * @param cls the 'struct BlacklistCheck*'
2932 do_blacklist_check (void *cls,
2933 const struct GNUNET_SCHEDULER_TaskContext *tc);
2937 * Transmit blacklist query to the client.
2939 * @param cls the 'struct BlacklistCheck'
2940 * @param size number of bytes allowed
2941 * @param buf where to copy the message
2942 * @return number of bytes copied to buf
2945 transmit_blacklist_message (void *cls,
2949 struct BlacklistCheck *bc = cls;
2950 struct Blacklisters *bl;
2951 struct BlacklistMessage bm;
2956 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2957 bc->task = GNUNET_SCHEDULER_add_now (sched,
2958 &do_blacklist_check,
2963 bm.header.size = htons (sizeof (struct BlacklistMessage));
2964 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2965 bm.is_allowed = htonl (0);
2967 memcpy (buf, &bm, sizeof (bm));
2968 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2974 * Perform next action in the blacklist check.
2976 * @param cls the 'struct BlacklistCheck*'
2980 do_blacklist_check (void *cls,
2981 const struct GNUNET_SCHEDULER_TaskContext *tc)
2983 struct BlacklistCheck *bc = cls;
2984 struct Blacklisters *bl;
2986 bc->task = GNUNET_SCHEDULER_NO_TASK;
2990 bc->cont (bc->cont_cls,
2991 setup_new_neighbour (&bc->peer, bc->do_hello));
2998 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2999 sizeof (struct BlacklistMessage),
3000 GNUNET_TIME_UNIT_FOREVER_REL,
3001 &transmit_blacklist_message,
3008 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
3009 * does not yet exist, check the blacklist. If the blacklist says creating
3010 * one is acceptable, create one and call the continuation; otherwise
3011 * call the continuation with NULL.
3013 * @param peer peer to setup or look up a struct NeighbourList for
3014 * @param do_hello should we also schedule sending our HELLO to the peer
3015 * if this is a new record
3016 * @param cont function to call with the 'struct NeigbhbourList*'
3017 * @param cont_cls closure for cont
3020 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3022 SetupContinuation cont,
3025 struct NeighbourList *n;
3026 struct BlacklistCheck *bc;
3028 n = find_neighbour(peer);
3035 if (bl_head == NULL)
3038 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3040 setup_new_neighbour(peer, do_hello);
3043 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3044 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3046 bc->do_hello = do_hello;
3048 bc->cont_cls = cont_cls;
3049 bc->bl_pos = bl_head;
3050 bc->task = GNUNET_SCHEDULER_add_now (sched,
3051 &do_blacklist_check,
3057 * Function called with the result of querying a new blacklister about
3058 * it being allowed (or not) to continue to talk to an existing neighbour.
3060 * @param cls the original 'struct NeighbourList'
3061 * @param n NULL if we need to disconnect
3064 confirm_or_drop_neighbour (void *cls,
3065 struct NeighbourList *n)
3067 struct NeighbourList * orig = cls;
3071 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3072 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3073 "confirm_or_drop_neighboUr");
3074 disconnect_neighbour (orig, GNUNET_NO);
3080 * Handle a request to start a blacklist.
3082 * @param cls closure (always NULL)
3083 * @param client identification of the client
3084 * @param message the actual message
3087 handle_blacklist_init (void *cls,
3088 struct GNUNET_SERVER_Client *client,
3089 const struct GNUNET_MessageHeader *message)
3091 struct Blacklisters *bl;
3092 struct BlacklistCheck *bc;
3093 struct NeighbourList *n;
3098 if (bl->client == client)
3101 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3106 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3107 bl->client = client;
3108 GNUNET_SERVER_client_keep (client);
3109 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3110 /* confirm that all existing connections are OK! */
3114 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3115 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3117 bc->do_hello = GNUNET_NO;
3118 bc->cont = &confirm_or_drop_neighbour;
3121 if (n == neighbours) /* all would wait for the same client, no need to
3122 create more than just the first task right now */
3123 bc->task = GNUNET_SCHEDULER_add_now (sched,
3124 &do_blacklist_check,
3132 * Handle a request to blacklist a peer.
3134 * @param cls closure (always NULL)
3135 * @param client identification of the client
3136 * @param message the actual message
3139 handle_blacklist_reply (void *cls,
3140 struct GNUNET_SERVER_Client *client,
3141 const struct GNUNET_MessageHeader *message)
3143 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3144 struct Blacklisters *bl;
3145 struct BlacklistCheck *bc;
3148 while ( (bl != NULL) &&
3149 (bl->client != client) )
3153 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3158 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3160 bc->cont (bc->cont_cls, NULL);
3161 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3166 bc->bl_pos = bc->bl_pos->next;
3167 bc->task = GNUNET_SCHEDULER_add_now (sched,
3168 &do_blacklist_check,
3171 /* check if any other bc's are waiting for this blacklister */
3175 if ( (bc->bl_pos == bl) &&
3176 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3177 bc->task = GNUNET_SCHEDULER_add_now (sched,
3178 &do_blacklist_check,
3186 * Send periodic PING messages to a given foreign address.
3188 * @param cls our 'struct PeriodicValidationContext*'
3189 * @param tc task context
3192 send_periodic_ping (void *cls,
3193 const struct GNUNET_SCHEDULER_TaskContext *tc)
3195 struct ForeignAddressList *peer_address = cls;
3196 struct TransportPlugin *tp;
3197 struct ValidationEntry *va;
3198 struct NeighbourList *neighbour;
3199 struct TransportPingMessage ping;
3200 struct CheckAddressExistsClosure caec;
3202 uint16_t hello_size;
3206 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3207 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3209 tp = peer_address->ready_list->plugin;
3210 neighbour = peer_address->ready_list->neighbour;
3211 if (GNUNET_YES != neighbour->public_key_valid)
3213 /* no public key yet, try again later */
3214 schedule_next_ping (peer_address);
3217 caec.addr = peer_address->addr;
3218 caec.addrlen = peer_address->addrlen;
3219 caec.tname = tp->short_name;
3220 caec.session = peer_address->session;
3221 caec.exists = GNUNET_NO;
3222 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3223 &check_address_exists,
3225 if (caec.exists == GNUNET_YES)
3227 /* During validation attempts we will likely trigger the other
3228 peer trying to validate our address which in turn will cause
3229 it to send us its HELLO, so we expect to hit this case rather
3230 frequently. Only print something if we are very verbose. */
3231 #if DEBUG_TRANSPORT > 1
3232 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3233 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3234 (peer_address->addr != NULL)
3235 ? a2s (tp->short_name,
3237 peer_address->addrlen)
3240 GNUNET_i2s (&neighbour->id));
3242 schedule_next_ping (peer_address);
3245 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3246 va->transport_name = GNUNET_strdup (tp->short_name);
3247 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3249 va->send_time = GNUNET_TIME_absolute_get();
3250 va->session = peer_address->session;
3251 if (peer_address->addr != NULL)
3253 va->addr = (const void*) &va[1];
3254 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3255 va->addrlen = peer_address->addrlen;
3257 memcpy(&va->publicKey,
3258 &neighbour->publicKey,
3259 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3261 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3262 HELLO_VERIFICATION_TIMEOUT,
3263 &timeout_hello_validation,
3265 GNUNET_CONTAINER_multihashmap_put (validation_map,
3266 &neighbour->id.hashPubKey,
3268 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3270 if (peer_address->validated != GNUNET_YES)
3271 hello_size = GNUNET_HELLO_size(our_hello);
3275 tsize = sizeof(struct TransportPingMessage) + hello_size;
3277 if (peer_address->addr != NULL)
3279 slen = strlen (tp->short_name) + 1;
3280 tsize += slen + peer_address->addrlen;
3284 slen = 0; /* make gcc happy */
3286 message_buf = GNUNET_malloc(tsize);
3287 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3288 ping.challenge = htonl(va->challenge);
3289 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3290 if (peer_address->validated != GNUNET_YES)
3292 memcpy(message_buf, our_hello, hello_size);
3295 if (peer_address->addr != NULL)
3297 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3298 peer_address->addrlen +
3300 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3303 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3305 peer_address->addrlen);
3309 ping.header.size = htons(sizeof(struct TransportPingMessage));
3312 memcpy(&message_buf[hello_size],
3314 sizeof(struct TransportPingMessage));
3316 #if DEBUG_TRANSPORT_REVALIDATION
3317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3318 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3319 (peer_address->addr != NULL)
3320 ? a2s (peer_address->plugin->short_name,
3322 peer_address->addrlen)
3325 GNUNET_i2s (&neighbour->id),
3326 "HELLO", hello_size,
3329 if (peer_address->validated != GNUNET_YES)
3330 GNUNET_STATISTICS_update (stats,
3331 gettext_noop ("# PING with HELLO messages sent"),
3335 GNUNET_STATISTICS_update (stats,
3336 gettext_noop ("# PING without HELLO messages sent"),
3339 GNUNET_STATISTICS_update (stats,
3340 gettext_noop ("# PING messages sent for re-validation"),
3343 transmit_to_peer (NULL, peer_address,
3344 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3345 HELLO_VERIFICATION_TIMEOUT,
3347 GNUNET_YES, neighbour);
3348 GNUNET_free(message_buf);
3349 schedule_next_ping (peer_address);
3354 * Schedule the job that will cause us to send a PING to the
3355 * foreign address to evaluate its validity and latency.
3357 * @param fal address to PING
3360 schedule_next_ping (struct ForeignAddressList *fal)
3362 struct GNUNET_TIME_Relative delay;
3364 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3366 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3367 delay.rel_value /= 2; /* do before expiration */
3368 delay = GNUNET_TIME_relative_min (delay,
3369 LATENCY_EVALUATION_MAX_DELAY);
3370 if (GNUNET_YES != fal->estimated)
3372 delay = GNUNET_TIME_UNIT_ZERO;
3373 fal->estimated = GNUNET_YES;
3375 if (GNUNET_YES == fal->connected)
3377 delay = GNUNET_TIME_relative_min (delay,
3378 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3380 /* FIXME: also adjust delay based on how close the last
3381 observed latency is to the latency of the best alternative */
3382 /* bound how fast we can go */
3383 delay = GNUNET_TIME_relative_max (delay,
3384 GNUNET_TIME_UNIT_SECONDS);
3385 /* randomize a bit (to avoid doing all at the same time) */
3386 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3387 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3389 &send_periodic_ping,
3397 * Function that will be called if we receive some payload
3398 * from another peer.
3400 * @param message the payload
3401 * @param n peer who claimed to be the sender
3404 handle_payload_message (const struct GNUNET_MessageHeader *message,
3405 struct NeighbourList *n)
3407 struct InboundMessage *im;
3408 struct TransportClient *cpos;
3411 msize = ntohs (message->size);
3412 if (n->received_pong == GNUNET_NO)
3414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3415 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3416 ntohs (message->type),
3417 ntohs (message->size),
3418 GNUNET_i2s (&n->id));
3419 GNUNET_free_non_null (n->pre_connect_message_buffer);
3420 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3421 memcpy (n->pre_connect_message_buffer, message, msize);
3426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3427 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3428 ntohs (message->type),
3429 ntohs (message->size),
3430 GNUNET_i2s (&n->id));
3432 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3435 n->quota_violation_count++;
3437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3438 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3439 n->in_tracker.available_bytes_per_s__,
3440 n->quota_violation_count);
3442 /* Discount 32k per violation */
3443 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3448 if (n->quota_violation_count > 0)
3450 /* try to add 32k back */
3451 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3453 n->quota_violation_count--;
3456 GNUNET_STATISTICS_update (stats,
3457 gettext_noop ("# payload received from other peers"),
3460 /* transmit message to all clients */
3461 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3462 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3463 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3464 im->latency = GNUNET_TIME_relative_hton (n->latency);
3466 im->distance = ntohl(n->distance);
3467 memcpy (&im[1], message, msize);
3469 while (cpos != NULL)
3471 transmit_to_client (cpos, &im->header, GNUNET_YES);
3479 * Iterator over hash map entries. Checks if the given validation
3480 * entry is for the same challenge as what is given in the PONG.
3482 * @param cls the 'struct TransportPongMessage*'
3483 * @param key peer identity
3484 * @param value value in the hash map ('struct ValidationEntry')
3485 * @return GNUNET_YES if we should continue to
3486 * iterate (mismatch), GNUNET_NO if not (entry matched)
3489 check_pending_validation (void *cls,
3490 const GNUNET_HashCode * key,
3493 const struct TransportPongMessage *pong = cls;
3494 struct ValidationEntry *ve = value;
3495 struct AddValidatedAddressContext avac;
3496 unsigned int challenge = ntohl(pong->challenge);
3497 struct GNUNET_HELLO_Message *hello;
3498 struct GNUNET_PeerIdentity target;
3499 struct NeighbourList *n;
3500 struct ForeignAddressList *fal;
3501 struct OwnAddressList *oal;
3502 struct TransportPlugin *tp;
3503 struct GNUNET_MessageHeader *prem;
3509 ps = ntohs (pong->header.size);
3510 if (ps < sizeof (struct TransportPongMessage))
3512 GNUNET_break_op (0);
3515 addr = (const char*) &pong[1];
3516 slen = strlen (ve->transport_name) + 1;
3517 if ( (ps - sizeof (struct TransportPongMessage) < slen) ||
3518 (ve->challenge != challenge) ||
3519 (addr[slen-1] != '\0') ||
3520 (0 != strcmp (addr, ve->transport_name)) ||
3521 (ntohl (pong->purpose.size)
3522 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3524 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3525 sizeof (struct GNUNET_PeerIdentity) + ps - sizeof (struct TransportPongMessage)) )
3530 alen = ps - sizeof (struct TransportPongMessage) - slen;
3531 switch (ntohl (pong->purpose.purpose))
3533 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3534 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3535 (0 != memcmp (&addr[slen],
3539 return GNUNET_YES; /* different entry, keep trying! */
3541 if (0 != memcmp (&pong->pid,
3543 sizeof (struct GNUNET_PeerIdentity)))
3545 GNUNET_break_op (0);
3549 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3554 GNUNET_break_op (0);
3559 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3560 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3562 a2s (ve->transport_name,
3563 (const struct sockaddr *) ve->addr,
3565 ve->transport_name);
3568 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3569 if (0 != memcmp (&pong->pid,
3571 sizeof (struct GNUNET_PeerIdentity)))
3573 GNUNET_break_op (0);
3576 if (ve->addrlen != 0)
3578 /* must have been for a different validation entry */
3581 tp = find_transport (ve->transport_name);
3587 oal = tp->addresses;
3590 if ( (oal->addrlen == alen) &&
3591 (0 == memcmp (&oal[1],
3599 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3600 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3601 a2s (ve->transport_name,
3607 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3612 GNUNET_break_op (0);
3617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3618 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3620 a2s (ve->transport_name,
3623 ve->transport_name);
3627 GNUNET_break_op (0);
3630 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
3632 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3633 _("Received expired signature. Check system time.\n"));
3636 GNUNET_STATISTICS_update (stats,
3637 gettext_noop ("# address validation successes"),
3640 /* create the updated HELLO */
3641 GNUNET_CRYPTO_hash (&ve->publicKey,
3642 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3643 &target.hashPubKey);
3644 if (ve->addr != NULL)
3646 avac.done = GNUNET_NO;
3648 hello = GNUNET_HELLO_create (&ve->publicKey,
3649 &add_validated_address,
3651 GNUNET_PEERINFO_add_peer (peerinfo,
3653 GNUNET_free (hello);
3655 n = find_neighbour (&target);
3658 n->publicKey = ve->publicKey;
3659 n->public_key_valid = GNUNET_YES;
3660 fal = add_peer_address (n,
3665 GNUNET_assert (fal != NULL);
3666 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3667 fal->validated = GNUNET_YES;
3668 mark_address_connected (fal);
3669 GNUNET_STATISTICS_update (stats,
3670 gettext_noop ("# peer addresses considered valid"),
3673 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3674 schedule_next_ping (fal);
3675 if (n->latency.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
3676 n->latency = fal->latency;
3678 n->latency.rel_value = (fal->latency.rel_value + n->latency.rel_value) / 2;
3680 n->distance = fal->distance;
3681 if (GNUNET_NO == n->received_pong)
3683 n->received_pong = GNUNET_YES;
3684 notify_clients_connect (&target, n->latency, n->distance);
3685 if (NULL != (prem = n->pre_connect_message_buffer))
3687 n->pre_connect_message_buffer = NULL;
3688 handle_payload_message (prem, n);
3692 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3694 GNUNET_SCHEDULER_cancel (sched,
3696 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3697 try_transmission_to_peer (n);
3701 /* clean up validation entry */
3702 GNUNET_assert (GNUNET_YES ==
3703 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3706 abort_validation (NULL, NULL, ve);
3712 * Function that will be called if we receive a validation
3713 * of an address challenge that we transmitted to another
3714 * peer. Note that the validation should only be considered
3715 * acceptable if the challenge matches AND if the sender
3716 * address is at least a plausible address for this peer
3717 * (otherwise we may be seeing a MiM attack).
3719 * @param cls closure
3720 * @param message the pong message
3721 * @param peer who responded to our challenge
3722 * @param sender_address string describing our sender address (as observed
3723 * by the other peer in binary format)
3724 * @param sender_address_len number of bytes in 'sender_address'
3727 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3728 const struct GNUNET_PeerIdentity *peer,
3729 const char *sender_address,
3730 size_t sender_address_len)
3732 #if DEBUG_TRANSPORT > 1
3733 /* we get tons of these that just get discarded, only log
3734 if we are quite verbose */
3735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3736 "Receiving `%s' message from `%4s'.\n", "PONG",
3739 GNUNET_STATISTICS_update (stats,
3740 gettext_noop ("# PONG messages received"),
3743 if (GNUNET_SYSERR !=
3744 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3746 &check_pending_validation,
3749 /* This is *expected* to happen a lot since we send
3750 PONGs to *all* known addresses of the sender of
3751 the PING, so most likely we get multiple PONGs
3752 per PING, and all but the first PONG will end up
3753 here. So really we should not print anything here
3754 unless we want to be very, very verbose... */
3755 #if DEBUG_TRANSPORT > 2
3756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3757 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3769 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3771 * @param cls the 'struct ValidationEntry*'
3772 * @param neighbour neighbour to validate, NULL if validation failed
3775 transmit_hello_and_ping (void *cls,
3776 struct NeighbourList *neighbour)
3778 struct ValidationEntry *va = cls;
3779 struct ForeignAddressList *peer_address;
3780 struct TransportPingMessage ping;
3781 uint16_t hello_size;
3784 struct GNUNET_PeerIdentity id;
3787 GNUNET_CRYPTO_hash (&va->publicKey,
3788 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3790 if (neighbour == NULL)
3792 /* FIXME: stats... */
3793 GNUNET_break (GNUNET_OK ==
3794 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3797 abort_validation (NULL, NULL, va);
3800 neighbour->publicKey = va->publicKey;
3801 neighbour->public_key_valid = GNUNET_YES;
3802 peer_address = add_peer_address (neighbour,
3803 va->transport_name, NULL,
3804 (const void*) &va[1],
3806 if (peer_address == NULL)
3808 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3809 "Failed to add peer `%4s' for plugin `%s'\n",
3810 GNUNET_i2s (&neighbour->id),
3811 va->transport_name);
3812 GNUNET_break (GNUNET_OK ==
3813 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3816 abort_validation (NULL, NULL, va);
3819 hello_size = GNUNET_HELLO_size(our_hello);
3820 slen = strlen(va->transport_name) + 1;
3821 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3822 message_buf = GNUNET_malloc(tsize);
3823 ping.challenge = htonl(va->challenge);
3824 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3825 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3826 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3827 memcpy(message_buf, our_hello, hello_size);
3828 memcpy(&message_buf[hello_size],
3830 sizeof(struct TransportPingMessage));
3831 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3834 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3839 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3842 : a2s (va->transport_name,
3843 (const void*) &va[1], va->addrlen),
3845 GNUNET_i2s (&neighbour->id),
3846 "HELLO", hello_size,
3847 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3850 GNUNET_STATISTICS_update (stats,
3851 gettext_noop ("# PING messages sent for initial validation"),
3854 transmit_to_peer (NULL, peer_address,
3855 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3856 HELLO_VERIFICATION_TIMEOUT,
3858 GNUNET_YES, neighbour);
3859 GNUNET_free(message_buf);
3864 * Check if the given address is already being validated; if not,
3865 * append the given address to the list of entries that are being be
3866 * validated and initiate validation.
3868 * @param cls closure ('struct CheckHelloValidatedContext *')
3869 * @param tname name of the transport
3870 * @param expiration expiration time
3871 * @param addr the address
3872 * @param addrlen length of the address
3873 * @return GNUNET_OK (always)
3876 run_validation (void *cls,
3878 struct GNUNET_TIME_Absolute expiration,
3882 struct CheckHelloValidatedContext *chvc = cls;
3883 struct GNUNET_PeerIdentity id;
3884 struct TransportPlugin *tp;
3885 struct ValidationEntry *va;
3886 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3887 struct CheckAddressExistsClosure caec;
3888 struct OwnAddressList *oal;
3890 GNUNET_assert (addr != NULL);
3892 GNUNET_STATISTICS_update (stats,
3893 gettext_noop ("# peer addresses scheduled for validation"),
3896 tp = find_transport (tname);
3899 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3900 GNUNET_ERROR_TYPE_BULK,
3902 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3904 GNUNET_STATISTICS_update (stats,
3905 gettext_noop ("# peer addresses not validated (plugin not available)"),
3910 /* check if this is one of our own addresses */
3911 oal = tp->addresses;
3914 if ( (oal->addrlen == addrlen) &&
3915 (0 == memcmp (&oal[1],
3919 /* not plausible, this address is equivalent to our own address! */
3920 GNUNET_STATISTICS_update (stats,
3921 gettext_noop ("# peer addresses not validated (loopback)"),
3928 GNUNET_HELLO_get_key (chvc->hello, &pk);
3929 GNUNET_CRYPTO_hash (&pk,
3931 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3934 if (is_blacklisted(&id, tp))
3937 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3938 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3946 caec.addrlen = addrlen;
3947 caec.session = NULL;
3949 caec.exists = GNUNET_NO;
3950 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3951 &check_address_exists,
3953 if (caec.exists == GNUNET_YES)
3955 /* During validation attempts we will likely trigger the other
3956 peer trying to validate our address which in turn will cause
3957 it to send us its HELLO, so we expect to hit this case rather
3958 frequently. Only print something if we are very verbose. */
3959 #if DEBUG_TRANSPORT > 1
3960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3961 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3962 a2s (tname, addr, addrlen),
3966 GNUNET_STATISTICS_update (stats,
3967 gettext_noop ("# peer addresses not validated (in progress)"),
3972 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3975 va->transport_name = GNUNET_strdup (tname);
3976 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3978 va->send_time = GNUNET_TIME_absolute_get();
3979 va->addr = (const void*) &va[1];
3980 memcpy (&va[1], addr, addrlen);
3981 va->addrlen = addrlen;
3982 GNUNET_HELLO_get_key (chvc->hello,
3984 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3985 HELLO_VERIFICATION_TIMEOUT,
3986 &timeout_hello_validation,
3988 GNUNET_CONTAINER_multihashmap_put (validation_map,
3991 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3992 setup_peer_check_blacklist (&id, GNUNET_NO,
3993 &transmit_hello_and_ping,
4000 * Check if addresses in validated hello "h" overlap with
4001 * those in "chvc->hello" and validate the rest.
4003 * @param cls closure
4004 * @param peer id of the peer, NULL for last call
4005 * @param h hello message for the peer (can be NULL)
4008 check_hello_validated (void *cls,
4009 const struct GNUNET_PeerIdentity *peer,
4010 const struct GNUNET_HELLO_Message *h)
4012 struct CheckHelloValidatedContext *chvc = cls;
4013 struct GNUNET_HELLO_Message *plain_hello;
4014 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
4015 struct GNUNET_PeerIdentity target;
4016 struct NeighbourList *n;
4020 GNUNET_STATISTICS_update (stats,
4021 gettext_noop ("# outstanding peerinfo iterate requests"),
4025 if (GNUNET_NO == chvc->hello_known)
4027 /* notify PEERINFO about the peer now, so that we at least
4028 have the public key if some other component needs it */
4029 GNUNET_HELLO_get_key (chvc->hello, &pk);
4030 GNUNET_CRYPTO_hash (&pk,
4031 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4032 &target.hashPubKey);
4033 plain_hello = GNUNET_HELLO_create (&pk,
4036 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4037 GNUNET_free (plain_hello);
4038 #if DEBUG_TRANSPORT_HELLO
4039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4040 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4042 GNUNET_i2s (&target));
4044 GNUNET_STATISTICS_update (stats,
4045 gettext_noop ("# new HELLOs requiring full validation"),
4048 GNUNET_HELLO_iterate_addresses (chvc->hello,
4055 GNUNET_STATISTICS_update (stats,
4056 gettext_noop ("# duplicate HELLO (peer known)"),
4061 if (chvc->ve_count == 0)
4063 GNUNET_CONTAINER_DLL_remove (chvc_head,
4072 #if DEBUG_TRANSPORT_HELLO
4073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4074 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4078 chvc->hello_known = GNUNET_YES;
4079 n = find_neighbour (peer);
4082 #if DEBUG_TRANSPORT_HELLO
4083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4084 "Calling hello_iterate_addresses for %s!\n",
4087 GNUNET_HELLO_iterate_addresses (h,
4089 &add_to_foreign_address_list,
4091 try_transmission_to_peer (n);
4095 #if DEBUG_TRANSPORT_HELLO
4096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4097 "No existing neighbor record for %s!\n",
4100 GNUNET_STATISTICS_update (stats,
4101 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4105 GNUNET_STATISTICS_update (stats,
4106 gettext_noop ("# HELLO validations (update case)"),
4109 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4111 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4118 * Process HELLO-message.
4120 * @param plugin transport involved, may be NULL
4121 * @param message the actual message
4122 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4125 process_hello (struct TransportPlugin *plugin,
4126 const struct GNUNET_MessageHeader *message)
4129 struct GNUNET_PeerIdentity target;
4130 const struct GNUNET_HELLO_Message *hello;
4131 struct CheckHelloValidatedContext *chvc;
4132 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4133 #if DEBUG_TRANSPORT_HELLO > 2
4136 hsize = ntohs (message->size);
4137 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4138 (hsize < sizeof (struct GNUNET_MessageHeader)))
4141 return GNUNET_SYSERR;
4143 GNUNET_STATISTICS_update (stats,
4144 gettext_noop ("# HELLOs received for validation"),
4148 /* first, check if load is too high */
4149 if (GNUNET_SCHEDULER_get_load (sched,
4150 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4152 GNUNET_STATISTICS_update (stats,
4153 gettext_noop ("# HELLOs ignored due to high load"),
4156 #if DEBUG_TRANSPORT_HELLO
4157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4158 "Ignoring `%s' for `%4s', load too high.\n",
4160 GNUNET_i2s (&target));
4164 hello = (const struct GNUNET_HELLO_Message *) message;
4165 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4167 #if DEBUG_TRANSPORT_HELLO
4168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4169 "Unable to get public key from `%s' for `%4s'!\n",
4171 GNUNET_i2s (&target));
4173 GNUNET_break_op (0);
4174 return GNUNET_SYSERR;
4177 GNUNET_CRYPTO_hash (&publicKey,
4178 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4179 &target.hashPubKey);
4181 #if DEBUG_TRANSPORT_HELLO
4182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4183 "Received `%s' message for `%4s'\n",
4185 GNUNET_i2s (&target));
4188 if (0 == memcmp (&my_identity,
4190 sizeof (struct GNUNET_PeerIdentity)))
4192 GNUNET_STATISTICS_update (stats,
4193 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4199 while (NULL != chvc)
4201 if (GNUNET_HELLO_equals (hello,
4203 GNUNET_TIME_absolute_get ()).abs_value > 0)
4205 #if DEBUG_TRANSPORT_HELLO > 2
4206 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4207 "Received duplicate `%s' message for `%4s'; ignored\n",
4209 GNUNET_i2s (&target));
4211 return GNUNET_OK; /* validation already pending */
4213 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4214 GNUNET_break (0 != memcmp (hello, chvc->hello,
4215 GNUNET_HELLO_size(hello)));
4220 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4221 if ((NULL != temp_neighbor))
4223 fprintf(stderr, "Already know peer, ignoring hello\n");
4228 #if DEBUG_TRANSPORT_HELLO > 2
4231 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4232 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4233 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4236 GNUNET_i2s (&target),
4238 GNUNET_HELLO_size(hello));
4242 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4244 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4245 memcpy (&chvc[1], hello, hsize);
4246 GNUNET_CONTAINER_DLL_insert (chvc_head,
4249 /* finally, check if HELLO was previously validated
4250 (continuation will then schedule actual validation) */
4251 GNUNET_STATISTICS_update (stats,
4252 gettext_noop ("# peerinfo process hello iterate requests"),
4255 GNUNET_STATISTICS_update (stats,
4256 gettext_noop ("# outstanding peerinfo iterate requests"),
4259 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4261 HELLO_VERIFICATION_TIMEOUT,
4262 &check_hello_validated, chvc);
4268 * The peer specified by the given neighbour has timed-out or a plugin
4269 * has disconnected. We may either need to do nothing (other plugins
4270 * still up), or trigger a full disconnect and clean up. This
4271 * function updates our state and does the necessary notifications.
4272 * Also notifies our clients that the neighbour is now officially
4275 * @param n the neighbour list entry for the peer
4276 * @param check GNUNET_YES to check if ALL addresses for this peer
4277 * are gone, GNUNET_NO to force a disconnect of the peer
4278 * regardless of whether other addresses exist.
4281 disconnect_neighbour (struct NeighbourList *n, int check)
4283 struct ReadyList *rpos;
4284 struct NeighbourList *npos;
4285 struct NeighbourList *nprev;
4286 struct MessageQueue *mq;
4287 struct ForeignAddressList *peer_addresses;
4288 struct ForeignAddressList *peer_pos;
4290 if (GNUNET_YES == check)
4293 while (NULL != rpos)
4295 peer_addresses = rpos->addresses;
4296 while (peer_addresses != NULL)
4298 if (GNUNET_YES == peer_addresses->connected)
4300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4301 "NOT Disconnecting from `%4s', still have live addresses!\n",
4302 GNUNET_i2s (&n->id));
4303 return; /* still connected */
4305 peer_addresses = peer_addresses->next;
4311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4312 "Disconnecting from `%4s'\n",
4313 GNUNET_i2s (&n->id));
4315 /* remove n from neighbours list */
4318 while ((npos != NULL) && (npos != n))
4323 GNUNET_assert (npos != NULL);
4325 neighbours = n->next;
4327 nprev->next = n->next;
4329 /* notify all clients about disconnect */
4330 if (GNUNET_YES == n->received_pong)
4331 notify_clients_disconnect (&n->id);
4333 /* clean up all plugins, cancel connections and pending transmissions */
4334 while (NULL != (rpos = n->plugins))
4336 n->plugins = rpos->next;
4337 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4338 while (rpos->addresses != NULL)
4340 peer_pos = rpos->addresses;
4341 rpos->addresses = peer_pos->next;
4342 if (peer_pos->connected == GNUNET_YES)
4343 GNUNET_STATISTICS_update (stats,
4344 gettext_noop ("# connected addresses"),
4347 if (GNUNET_YES == peer_pos->validated)
4348 GNUNET_STATISTICS_update (stats,
4349 gettext_noop ("# peer addresses considered valid"),
4352 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4354 GNUNET_SCHEDULER_cancel (sched,
4355 peer_pos->revalidate_task);
4356 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4358 GNUNET_free(peer_pos);
4363 /* free all messages on the queue */
4364 while (NULL != (mq = n->messages_head))
4366 GNUNET_STATISTICS_update (stats,
4367 gettext_noop ("# bytes in message queue for other peers"),
4368 - (int64_t) mq->message_buf_size,
4370 GNUNET_STATISTICS_update (stats,
4371 gettext_noop ("# bytes discarded due to disconnect"),
4372 mq->message_buf_size,
4374 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4377 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4379 sizeof(struct GNUNET_PeerIdentity)));
4382 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4384 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
4385 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4387 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4389 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
4390 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4392 if (n->piter != NULL)
4394 GNUNET_PEERINFO_iterate_cancel (n->piter);
4395 GNUNET_STATISTICS_update (stats,
4396 gettext_noop ("# outstanding peerinfo iterate requests"),
4401 /* finally, free n itself */
4402 GNUNET_STATISTICS_update (stats,
4403 gettext_noop ("# active neighbours"),
4406 GNUNET_free_non_null (n->pre_connect_message_buffer);
4412 * We have received a PING message from someone. Need to send a PONG message
4413 * in response to the peer by any means necessary.
4416 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4417 const struct GNUNET_PeerIdentity *peer,
4418 struct Session *session,
4419 const char *sender_address,
4420 uint16_t sender_address_len)
4422 struct TransportPlugin *plugin = cls;
4423 struct SessionHeader *session_header = (struct SessionHeader*) session;
4424 struct TransportPingMessage *ping;
4425 struct TransportPongMessage *pong;
4426 struct NeighbourList *n;
4427 struct ReadyList *rl;
4428 struct ForeignAddressList *fal;
4429 struct OwnAddressList *oal;
4434 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4436 GNUNET_break_op (0);
4437 return GNUNET_SYSERR;
4440 ping = (struct TransportPingMessage *) message;
4441 if (0 != memcmp (&ping->target,
4442 plugin->env.my_identity,
4443 sizeof (struct GNUNET_PeerIdentity)))
4445 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4446 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4448 (sender_address != NULL)
4449 ? a2s (plugin->short_name,
4450 (const struct sockaddr *)sender_address,
4453 GNUNET_i2s (&ping->target));
4454 return GNUNET_SYSERR;
4457 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4458 "Processing `%s' from `%s'\n",
4460 (sender_address != NULL)
4461 ? a2s (plugin->short_name,
4462 (const struct sockaddr *)sender_address,
4466 GNUNET_STATISTICS_update (stats,
4467 gettext_noop ("# PING messages received"),
4470 addr = (const char*) &ping[1];
4471 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4472 slen = strlen (plugin->short_name) + 1;
4475 /* peer wants to confirm that we have an outbound connection to him */
4476 if (session == NULL)
4478 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4479 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4481 return GNUNET_SYSERR;
4483 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4484 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4485 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4486 pong->purpose.size =
4487 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4489 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4490 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4491 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4492 pong->challenge = ping->challenge;
4493 pong->addrlen = htonl(sender_address_len + slen);
4496 sizeof(struct GNUNET_PeerIdentity));
4500 memcpy (&((char*)&pong[1])[slen],
4502 sender_address_len);
4503 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4505 /* create / update cached sig */
4507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4508 "Creating PONG signature to indicate active connection.\n");
4510 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4511 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4512 GNUNET_assert (GNUNET_OK ==
4513 GNUNET_CRYPTO_rsa_sign (my_private_key,
4515 &session_header->pong_signature));
4519 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4521 memcpy (&pong->signature,
4522 &session_header->pong_signature,
4523 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4529 /* peer wants to confirm that this is one of our addresses */
4533 plugin->api->check_address (plugin->api->cls,
4537 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4538 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4539 a2s (plugin->short_name,
4544 oal = plugin->addresses;
4547 if ( (oal->addrlen == alen) &&
4554 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4555 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4556 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4557 pong->purpose.size =
4558 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4560 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4561 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4562 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4563 pong->challenge = ping->challenge;
4564 pong->addrlen = htonl(alen + slen);
4567 sizeof(struct GNUNET_PeerIdentity));
4568 memcpy (&pong[1], plugin->short_name, slen);
4569 memcpy (&((char*)&pong[1])[slen], addr, alen);
4570 if ( (oal != NULL) &&
4571 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4573 /* create / update cached sig */
4575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4576 "Creating PONG signature to indicate ownership.\n");
4578 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4579 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4580 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4581 GNUNET_assert (GNUNET_OK ==
4582 GNUNET_CRYPTO_rsa_sign (my_private_key,
4584 &oal->pong_signature));
4585 memcpy (&pong->signature,
4586 &oal->pong_signature,
4587 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4589 else if (oal == NULL)
4591 /* not using cache (typically DV-only) */
4592 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4593 GNUNET_assert (GNUNET_OK ==
4594 GNUNET_CRYPTO_rsa_sign (my_private_key,
4600 /* can used cached version */
4601 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4602 memcpy (&pong->signature,
4603 &oal->pong_signature,
4604 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4607 n = find_neighbour(peer);
4608 GNUNET_assert (n != NULL);
4609 /* first try reliable response transmission */
4613 fal = rl->addresses;
4616 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4619 ntohs (pong->header.size),
4620 TRANSPORT_PONG_PRIORITY,
4621 HELLO_VERIFICATION_TIMEOUT,
4629 GNUNET_STATISTICS_update (stats,
4630 gettext_noop ("# PONGs unicast via reliable transport"),
4640 /* no reliable method found, do multicast */
4641 GNUNET_STATISTICS_update (stats,
4642 gettext_noop ("# PONGs multicast to all available addresses"),
4648 fal = rl->addresses;
4651 transmit_to_peer(NULL, fal,
4652 TRANSPORT_PONG_PRIORITY,
4653 HELLO_VERIFICATION_TIMEOUT,
4655 ntohs(pong->header.size),
4668 * Function called by the plugin for each received message.
4669 * Update data volumes, possibly notify plugins about
4670 * reducing the rate at which they read from the socket
4671 * and generally forward to our receive callback.
4673 * @param cls the "struct TransportPlugin *" we gave to the plugin
4674 * @param peer (claimed) identity of the other peer
4675 * @param message the message, NULL if we only care about
4676 * learning about the delay until we should receive again
4677 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4678 * @param session identifier used for this session (can be NULL)
4679 * @param sender_address binary address of the sender (if observed)
4680 * @param sender_address_len number of bytes in sender_address
4681 * @return how long in ms the plugin should wait until receiving more data
4682 * (plugins that do not support this, can ignore the return value)
4684 static struct GNUNET_TIME_Relative
4685 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4686 const struct GNUNET_MessageHeader *message,
4688 struct Session *session,
4689 const char *sender_address,
4690 uint16_t sender_address_len)
4692 struct TransportPlugin *plugin = cls;
4693 struct ReadyList *service_context;
4694 struct ForeignAddressList *peer_address;
4696 struct NeighbourList *n;
4697 struct GNUNET_TIME_Relative ret;
4698 if (is_blacklisted (peer, plugin))
4699 return GNUNET_TIME_UNIT_FOREVER_REL;
4701 n = find_neighbour (peer);
4703 n = setup_new_neighbour (peer, GNUNET_YES);
4704 service_context = n->plugins;
4705 while ((service_context != NULL) && (plugin != service_context->plugin))
4706 service_context = service_context->next;
4707 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4708 peer_address = NULL;
4709 if (message != NULL)
4711 if ( (session != NULL) ||
4712 (sender_address != NULL) )
4713 peer_address = add_peer_address (n,
4717 sender_address_len);
4718 if (peer_address != NULL)
4720 peer_address->distance = distance;
4721 if (GNUNET_YES == peer_address->validated)
4722 mark_address_connected (peer_address);
4723 peer_address->timeout
4725 GNUNET_TIME_relative_to_absolute
4726 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4727 schedule_next_ping (peer_address);
4729 /* update traffic received amount ... */
4730 msize = ntohs (message->size);
4731 GNUNET_STATISTICS_update (stats,
4732 gettext_noop ("# bytes received from other peers"),
4735 n->distance = distance;
4737 GNUNET_TIME_relative_to_absolute
4738 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4739 GNUNET_SCHEDULER_cancel (sched,
4742 GNUNET_SCHEDULER_add_delayed (sched,
4743 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4744 &neighbour_timeout_task, n);
4745 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4747 /* dropping message due to frequent inbound volume violations! */
4748 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4749 GNUNET_ERROR_TYPE_BULK,
4751 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4752 n->in_tracker.available_bytes_per_s__,
4753 n->quota_violation_count);
4754 GNUNET_STATISTICS_update (stats,
4755 gettext_noop ("# bandwidth quota violations by other peers"),
4758 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4763 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4764 ntohs (message->type),
4765 ntohs (message->size),
4768 switch (ntohs (message->type))
4770 case GNUNET_MESSAGE_TYPE_HELLO:
4771 GNUNET_STATISTICS_update (stats,
4772 gettext_noop ("# HELLO messages received from other peers"),
4775 process_hello (plugin, message);
4777 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4778 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4780 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4781 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4784 handle_payload_message (message, n);
4788 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4789 if (ret.rel_value > 0)
4791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4792 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4793 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4794 (unsigned int) n->in_tracker.available_bytes_per_s__,
4795 (unsigned long long) ret.rel_value);
4796 GNUNET_STATISTICS_update (stats,
4797 gettext_noop ("# ms throttling suggested"),
4798 (int64_t) ret.rel_value,
4805 * Handle START-message. This is the first message sent to us
4806 * by any client which causes us to add it to our list.
4808 * @param cls closure (always NULL)
4809 * @param client identification of the client
4810 * @param message the actual message
4813 handle_start (void *cls,
4814 struct GNUNET_SERVER_Client *client,
4815 const struct GNUNET_MessageHeader *message)
4817 const struct StartMessage *start;
4818 struct TransportClient *c;
4819 struct ConnectInfoMessage cim;
4820 struct NeighbourList *n;
4822 start = (const struct StartMessage*) message;
4824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4825 "Received `%s' request from client\n", "START");
4830 if (c->client == client)
4832 /* client already on our list! */
4834 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4839 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4840 (0 != memcmp (&start->self,
4842 sizeof (struct GNUNET_PeerIdentity))) )
4844 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4845 _("Rejecting control connection from peer `%s', which is not me!\n"),
4846 GNUNET_i2s (&start->self));
4847 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4850 c = GNUNET_malloc (sizeof (struct TransportClient));
4854 if (our_hello != NULL)
4857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4858 "Sending our own `%s' to new client\n", "HELLO");
4860 transmit_to_client (c,
4861 (const struct GNUNET_MessageHeader *) our_hello,
4863 /* tell new client about all existing connections */
4864 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4865 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4869 if (GNUNET_YES == n->received_pong)
4872 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4873 cim.distance = htonl (n->distance);
4874 transmit_to_client (c, &cim.header, GNUNET_NO);
4879 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4884 * Handle HELLO-message.
4886 * @param cls closure (always NULL)
4887 * @param client identification of the client
4888 * @param message the actual message
4891 handle_hello (void *cls,
4892 struct GNUNET_SERVER_Client *client,
4893 const struct GNUNET_MessageHeader *message)
4897 GNUNET_STATISTICS_update (stats,
4898 gettext_noop ("# HELLOs received from clients"),
4901 ret = process_hello (NULL, message);
4902 GNUNET_SERVER_receive_done (client, ret);
4907 * Closure for 'transmit_client_message'; followed by
4908 * 'msize' bytes of the actual message.
4910 struct TransmitClientMessageContext
4913 * Client on whom's behalf we are sending.
4915 struct GNUNET_SERVER_Client *client;
4918 * Timeout for the transmission.
4920 struct GNUNET_TIME_Absolute timeout;
4928 * Size of the message in bytes.
4935 * Schedule transmission of a message we got from a client to a peer.
4937 * @param cls the 'struct TransmitClientMessageContext*'
4938 * @param n destination, or NULL on error (in that case, drop the message)
4941 transmit_client_message (void *cls,
4942 struct NeighbourList *n)
4944 struct TransmitClientMessageContext *tcmc = cls;
4945 struct TransportClient *tc;
4948 while ((tc != NULL) && (tc->client != tcmc->client))
4953 transmit_to_peer (tc, NULL, tcmc->priority,
4954 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4956 tcmc->msize, GNUNET_NO, n);
4958 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4959 GNUNET_SERVER_client_drop (tcmc->client);
4965 * Handle SEND-message.
4967 * @param cls closure (always NULL)
4968 * @param client identification of the client
4969 * @param message the actual message
4972 handle_send (void *cls,
4973 struct GNUNET_SERVER_Client *client,
4974 const struct GNUNET_MessageHeader *message)
4976 const struct OutboundMessage *obm;
4977 const struct GNUNET_MessageHeader *obmm;
4978 struct TransmitClientMessageContext *tcmc;
4982 size = ntohs (message->size);
4984 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4987 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4990 GNUNET_STATISTICS_update (stats,
4991 gettext_noop ("# payload received for other peers"),
4994 obm = (const struct OutboundMessage *) message;
4995 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4996 msize = size - sizeof (struct OutboundMessage);
4998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4999 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
5000 "SEND", GNUNET_i2s (&obm->peer),
5004 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
5005 tcmc->client = client;
5006 tcmc->priority = ntohl (obm->priority);
5007 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
5008 tcmc->msize = msize;
5009 /* FIXME: this memcpy can be up to 7% of our total runtime */
5010 memcpy (&tcmc[1], obmm, msize);
5011 GNUNET_SERVER_client_keep (client);
5012 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
5013 &transmit_client_message,
5019 * Handle request connect message
5021 * @param cls closure (always NULL)
5022 * @param client identification of the client
5023 * @param message the actual message
5026 handle_request_connect (void *cls,
5027 struct GNUNET_SERVER_Client *client,
5028 const struct GNUNET_MessageHeader *message)
5030 const struct TransportRequestConnectMessage *trcm =
5031 (const struct TransportRequestConnectMessage *) message;
5033 GNUNET_STATISTICS_update (stats,
5034 gettext_noop ("# REQUEST CONNECT messages received"),
5037 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5038 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5040 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5044 * Handle SET_QUOTA-message.
5046 * @param cls closure (always NULL)
5047 * @param client identification of the client
5048 * @param message the actual message
5051 handle_set_quota (void *cls,
5052 struct GNUNET_SERVER_Client *client,
5053 const struct GNUNET_MessageHeader *message)
5055 const struct QuotaSetMessage *qsm =
5056 (const struct QuotaSetMessage *) message;
5057 struct NeighbourList *n;
5059 GNUNET_STATISTICS_update (stats,
5060 gettext_noop ("# SET QUOTA messages received"),
5063 n = find_neighbour (&qsm->peer);
5066 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5067 GNUNET_STATISTICS_update (stats,
5068 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5075 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5077 (unsigned int) ntohl (qsm->quota.value__),
5078 (unsigned int) n->in_tracker.available_bytes_per_s__,
5079 GNUNET_i2s (&qsm->peer));
5081 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5083 if (0 == ntohl (qsm->quota.value__))
5085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5086 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5088 disconnect_neighbour (n, GNUNET_NO);
5090 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5095 * Take the given address and append it to the set of results sent back to
5098 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5099 * @param address the resolved name, NULL to indicate the last response
5102 transmit_address_to_client (void *cls, const char *address)
5104 struct GNUNET_SERVER_TransmitContext *tc = cls;
5107 if (NULL == address)
5110 slen = strlen (address) + 1;
5112 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5113 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5114 if (NULL == address)
5115 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5120 * Handle AddressLookup-message.
5122 * @param cls closure (always NULL)
5123 * @param client identification of the client
5124 * @param message the actual message
5127 handle_address_lookup (void *cls,
5128 struct GNUNET_SERVER_Client *client,
5129 const struct GNUNET_MessageHeader *message)
5131 const struct AddressLookupMessage *alum;
5132 struct TransportPlugin *lsPlugin;
5133 const char *nameTransport;
5134 const char *address;
5136 struct GNUNET_SERVER_TransmitContext *tc;
5137 struct GNUNET_TIME_Absolute timeout;
5138 struct GNUNET_TIME_Relative rtimeout;
5141 size = ntohs (message->size);
5142 if (size < sizeof (struct AddressLookupMessage))
5144 GNUNET_break_op (0);
5145 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5148 alum = (const struct AddressLookupMessage *) message;
5149 uint32_t addressLen = ntohl (alum->addrlen);
5150 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5152 GNUNET_break_op (0);
5153 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5156 address = (const char *) &alum[1];
5157 nameTransport = (const char *) &address[addressLen];
5159 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5161 GNUNET_break_op (0);
5162 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5165 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5166 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5167 numeric = ntohl (alum->numeric_only);
5168 lsPlugin = find_transport (nameTransport);
5169 if (NULL == lsPlugin)
5171 tc = GNUNET_SERVER_transmit_context_create (client);
5172 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5173 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5174 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5177 tc = GNUNET_SERVER_transmit_context_create (client);
5178 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5180 address, addressLen,
5183 &transmit_address_to_client, tc);
5188 * Setup the environment for this plugin.
5191 create_environment (struct TransportPlugin *plug)
5193 plug->env.cfg = cfg;
5194 plug->env.sched = sched;
5195 plug->env.my_identity = &my_identity;
5196 plug->env.our_hello = &our_hello;
5197 plug->env.cls = plug;
5198 plug->env.receive = &plugin_env_receive;
5199 plug->env.notify_address = &plugin_env_notify_address;
5200 plug->env.session_end = &plugin_env_session_end;
5201 plug->env.max_connections = max_connect_per_transport;
5202 plug->env.stats = stats;
5207 * Start the specified transport (load the plugin).
5210 start_transport (struct GNUNET_SERVER_Handle *server,
5213 struct TransportPlugin *plug;
5216 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5217 _("Loading `%s' transport plugin\n"), name);
5218 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5219 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5220 create_environment (plug);
5221 plug->short_name = GNUNET_strdup (name);
5222 plug->lib_name = libname;
5223 plug->next = plugins;
5225 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5226 if (plug->api == NULL)
5228 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5229 _("Failed to load transport plugin for `%s'\n"), name);
5230 GNUNET_free (plug->short_name);
5231 plugins = plug->next;
5232 GNUNET_free (libname);
5239 * Called whenever a client is disconnected. Frees our
5240 * resources associated with that client.
5242 * @param cls closure
5243 * @param client identification of the client
5246 client_disconnect_notification (void *cls,
5247 struct GNUNET_SERVER_Client *client)
5249 struct TransportClient *pos;
5250 struct TransportClient *prev;
5251 struct ClientMessageQueueEntry *mqe;
5252 struct Blacklisters *bl;
5253 struct BlacklistCheck *bc;
5258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5259 "Client disconnected, cleaning up.\n");
5261 /* clean up blacklister */
5265 if (bl->client == client)
5270 if (bc->bl_pos == bl)
5272 bc->bl_pos = bl->next;
5275 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5278 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5279 bc->task = GNUNET_SCHEDULER_add_now (sched,
5280 &do_blacklist_check,
5286 GNUNET_CONTAINER_DLL_remove (bl_head,
5289 GNUNET_SERVER_client_drop (bl->client);
5295 /* clean up 'normal' clients */
5298 while ((pos != NULL) && (pos->client != client))
5305 while (NULL != (mqe = pos->message_queue_head))
5307 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5308 pos->message_queue_tail,
5310 pos->message_count--;
5314 clients = pos->next;
5316 prev->next = pos->next;
5317 if (GNUNET_YES == pos->tcs_pending)
5322 if (pos->th != NULL)
5324 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5327 GNUNET_break (0 == pos->message_count);
5333 * Function called when the service shuts down. Unloads our plugins
5334 * and cancels pending validations.
5336 * @param cls closure, unused
5337 * @param tc task context (unused)
5340 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5342 struct TransportPlugin *plug;
5343 struct OwnAddressList *al;
5344 struct CheckHelloValidatedContext *chvc;
5346 while (neighbours != NULL)
5348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5349 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5351 disconnect_neighbour (neighbours, GNUNET_NO);
5354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5355 "Transport service is unloading plugins...\n");
5357 while (NULL != (plug = plugins))
5359 plugins = plug->next;
5360 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5362 GNUNET_SCHEDULER_cancel (plug->env.sched,
5363 plug->address_update_task);
5364 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5366 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5367 GNUNET_free (plug->lib_name);
5368 GNUNET_free (plug->short_name);
5369 while (NULL != (al = plug->addresses))
5371 plug->addresses = al->next;
5376 if (my_private_key != NULL)
5377 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5378 GNUNET_free_non_null (our_hello);
5380 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5383 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5384 validation_map = NULL;
5386 /* free 'chvc' data structure */
5387 while (NULL != (chvc = chvc_head))
5389 chvc_head = chvc->next;
5390 if (chvc->piter != NULL)
5392 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5393 GNUNET_STATISTICS_update (stats,
5394 gettext_noop ("# outstanding peerinfo iterate requests"),
5400 GNUNET_assert (chvc->ve_count == 0);
5407 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5410 if (peerinfo != NULL)
5412 GNUNET_PEERINFO_disconnect (peerinfo);
5415 /* Can we assume those are gone by now, or do we need to clean up
5417 GNUNET_break (bl_head == NULL);
5418 GNUNET_break (bc_head == NULL);
5423 * Initiate transport service.
5425 * @param cls closure
5426 * @param s scheduler to use
5427 * @param server the initialized server
5428 * @param c configuration to use
5432 struct GNUNET_SCHEDULER_Handle *s,
5433 struct GNUNET_SERVER_Handle *server,
5434 const struct GNUNET_CONFIGURATION_Handle *c)
5436 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5437 {&handle_start, NULL,
5438 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5439 {&handle_hello, NULL,
5440 GNUNET_MESSAGE_TYPE_HELLO, 0},
5441 {&handle_send, NULL,
5442 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5443 {&handle_request_connect, NULL,
5444 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5445 {&handle_set_quota, NULL,
5446 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5447 {&handle_address_lookup, NULL,
5448 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5450 {&handle_blacklist_init, NULL,
5451 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5452 {&handle_blacklist_reply, NULL,
5453 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5459 unsigned long long tneigh;
5464 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
5465 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5466 /* parse configuration */
5468 GNUNET_CONFIGURATION_get_value_number (c,
5473 GNUNET_CONFIGURATION_get_value_filename (c,
5475 "HOSTKEY", &keyfile)))
5477 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5479 ("Transport service is lacking key configuration settings. Exiting.\n"));
5480 GNUNET_SCHEDULER_shutdown (s);
5483 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5486 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5487 validation_map = NULL;
5490 max_connect_per_transport = (uint32_t) tneigh;
5491 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
5492 if (peerinfo == NULL)
5494 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5495 _("Could not access PEERINFO service. Exiting.\n"));
5496 GNUNET_SCHEDULER_shutdown (s);
5499 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5502 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5503 validation_map = NULL;
5504 GNUNET_free (keyfile);
5507 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5508 GNUNET_free (keyfile);
5509 if (my_private_key == NULL)
5511 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5513 ("Transport service could not access hostkey. Exiting.\n"));
5514 GNUNET_SCHEDULER_shutdown (s);
5517 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5520 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5521 validation_map = NULL;
5524 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5525 GNUNET_CRYPTO_hash (&my_public_key,
5526 sizeof (my_public_key), &my_identity.hashPubKey);
5527 /* setup notification */
5528 GNUNET_SERVER_disconnect_notify (server,
5529 &client_disconnect_notification, NULL);
5530 /* load plugins... */
5533 GNUNET_CONFIGURATION_get_value_string (c,
5534 "TRANSPORT", "PLUGINS", &plugs))
5536 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5537 _("Starting transport plugins `%s'\n"), plugs);
5538 pos = strtok (plugs, " ");
5541 start_transport (server, pos);
5543 pos = strtok (NULL, " ");
5545 GNUNET_free (plugs);
5547 GNUNET_SCHEDULER_add_delayed (sched,
5548 GNUNET_TIME_UNIT_FOREVER_REL,
5549 &shutdown_task, NULL);
5554 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5556 /* If we have a blacklist file, read from it */
5557 read_blacklist_file(cfg);
5558 /* process client requests */
5559 GNUNET_SERVER_add_handlers (server, handlers);
5564 * The main function for the transport service.
5566 * @param argc number of arguments from the command line
5567 * @param argv command line arguments
5568 * @return 0 ok, 1 on error
5571 main (int argc, char *const *argv)
5573 a2s (NULL, NULL, 0); /* make compiler happy */
5574 return (GNUNET_OK ==
5575 GNUNET_SERVICE_run (argc,
5578 GNUNET_SERVICE_OPTION_NONE,
5579 &run, NULL)) ? 0 : 1;
5582 /* end of gnunet-service-transport.c */