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3 (C) 2010-2014 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_validation.c
23 * @brief address validation subsystem
24 * @author Christian Grothoff
27 #include "gnunet-service-transport_clients.h"
28 #include "gnunet-service-transport_validation.h"
29 #include "gnunet-service-transport_plugins.h"
30 #include "gnunet-service-transport_hello.h"
31 #include "gnunet-service-transport_blacklist.h"
32 #include "gnunet-service-transport_neighbours.h"
33 #include "gnunet-service-transport.h"
34 #include "gnunet_hello_lib.h"
35 #include "gnunet_ats_service.h"
36 #include "gnunet_peerinfo_service.h"
37 #include "gnunet_signatures.h"
41 * How long is a PONG signature valid? We'll recycle a signature until
42 * 1/4 of this time is remaining. PONGs should expire so that if our
43 * external addresses change an adversary cannot replay them indefinitely.
44 * OTOH, we don't want to spend too much time generating PONG signatures,
45 * so they must have some lifetime to reduce our CPU usage.
47 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
50 * After how long do we expire an address in a HELLO that we just
51 * validated? This value is also used for our own addresses when we
54 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
57 * How often do we allow PINGing an address that we have not yet
58 * validated? This also determines how long we track an address that
59 * we cannot validate (because after this time we can destroy the
62 #define UNVALIDATED_PING_KEEPALIVE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
65 * How often do we PING an address that we have successfully validated
66 * in the past but are not actively using? Should be (significantly)
67 * smaller than HELLO_ADDRESS_EXPIRATION.
69 #define VALIDATED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
72 * How often do we PING an address that we are currently using?
74 #define CONNECTED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
77 * How much delay is acceptable for sending the PING or PONG?
79 #define ACCEPTABLE_PING_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
82 * Size of the validation map hashmap.
84 #define VALIDATION_MAP_SIZE 256
87 * Priority to use for PINGs
89 #define PING_PRIORITY 2
92 * Priority to use for PONGs
94 #define PONG_PRIORITY 4
97 GNUNET_NETWORK_STRUCT_BEGIN
100 * Message used to ask a peer to validate receipt (to check an address
101 * from a HELLO). Followed by the address we are trying to validate,
102 * or an empty address if we are just sending a PING to confirm that a
103 * connection which the receiver (of the PING) initiated is still valid.
105 struct TransportPingMessage
109 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
111 struct GNUNET_MessageHeader header;
114 * Challenge code (to ensure fresh reply).
116 uint32_t challenge GNUNET_PACKED;
119 * Who is the intended recipient?
121 struct GNUNET_PeerIdentity target;
127 * Message used to validate a HELLO. The challenge is included in the
128 * confirmation to make matching of replies to requests possible. The
129 * signature signs our public key, an expiration time and our address.<p>
131 * This message is followed by our transport address that the PING tried
132 * to confirm (if we liked it). The address can be empty (zero bytes)
133 * if the PING had not address either (and we received the request via
134 * a connection that we initiated).
136 struct TransportPongMessage
140 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
142 struct GNUNET_MessageHeader header;
145 * Challenge code from PING (showing freshness). Not part of what
146 * is signed so that we can re-use signatures.
148 uint32_t challenge GNUNET_PACKED;
153 struct GNUNET_CRYPTO_EddsaSignature signature;
156 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
157 * plausible address for the signing peer.
159 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
162 * When does this signature expire?
164 struct GNUNET_TIME_AbsoluteNBO expiration;
167 * Size of address appended to this message (part of what is
168 * being signed, hence not redundant).
170 uint32_t addrlen GNUNET_PACKED;
173 GNUNET_NETWORK_STRUCT_END
176 * Information about an address under validation
178 struct ValidationEntry
184 struct GNUNET_HELLO_Address *address;
187 * Handle to the blacklist check (if we're currently in it).
189 struct GST_BlacklistCheck *bc;
192 * Public key of the peer.
194 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
197 * The identity of the peer. FIXME: duplicated (also in 'address')
199 struct GNUNET_PeerIdentity pid;
202 * Cached PONG signature
204 struct GNUNET_CRYPTO_EddsaSignature pong_sig_cache;
207 * ID of task that will clean up this entry if nothing happens.
209 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
212 * ID of task that will trigger address revalidation.
214 GNUNET_SCHEDULER_TaskIdentifier revalidation_task;
217 * At what time did we send the latest validation request (PING)?
219 struct GNUNET_TIME_Absolute send_time;
222 * At what time do we send the next validation request (PING)?
224 struct GNUNET_TIME_Absolute next_validation;
227 * Until when is this address valid?
228 * ZERO if it is not currently considered valid.
230 struct GNUNET_TIME_Absolute valid_until;
233 * Until when is the cached PONG signature valid?
234 * ZERO if it is not currently considered valid.
236 struct GNUNET_TIME_Absolute pong_sig_valid_until;
239 * How long until we can try to validate this address again?
240 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
241 * ZERO if the address is considered valid (no validation needed)
242 * otherwise a time in the future if we're currently denying re-validation
244 struct GNUNET_TIME_Absolute revalidation_block;
247 * Last observed latency for this address (round-trip), delay between
248 * last PING sent and PONG received; FOREVER if we never got a PONG.
250 struct GNUNET_TIME_Relative latency;
253 * Current state of this validation entry
255 enum GNUNET_TRANSPORT_ValidationState state;
257 * Challenge number we used.
262 * When passing the address in 'add_valid_peer_address', did we
263 * copy the address to the HELLO yet?
268 * Are we currently using this address for a connection?
273 * Are we expecting a PONG message for this validation entry?
277 enum GNUNET_ATS_Network_Type network;
282 * Context of currently active requests to peerinfo
283 * for validation of HELLOs.
285 struct CheckHelloValidatedContext
289 * This is a doubly-linked list.
291 struct CheckHelloValidatedContext *next;
294 * This is a doubly-linked list.
296 struct CheckHelloValidatedContext *prev;
299 * Hello that we are validating.
301 const struct GNUNET_HELLO_Message *hello;
307 * Head of linked list of HELLOs awaiting validation.
309 static struct CheckHelloValidatedContext *chvc_head;
312 * Tail of linked list of HELLOs awaiting validation
314 static struct CheckHelloValidatedContext *chvc_tail;
317 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
318 * of the given peer that we are currently validating, have validated
319 * or are blocked from re-validation for a while).
321 static struct GNUNET_CONTAINER_MultiPeerMap *validation_map;
324 * Context for peerinfo iteration.
326 static struct GNUNET_PEERINFO_NotifyContext *pnc;
329 * Minimum delay between to validations
331 static struct GNUNET_TIME_Relative validation_delay;
334 * Number of validations running
336 static unsigned int validations_running;
339 * Validition fast start threshold
341 static unsigned int validations_fast_start_threshold;
344 * When is next validation allowed
346 static struct GNUNET_TIME_Absolute validation_next;
350 * Context for the validation entry match function.
352 struct ValidationEntryMatchContext
355 * Where to store the result?
357 struct ValidationEntry *ve;
360 * Address we're interested in.
362 const struct GNUNET_HELLO_Address *address;
368 * Iterate over validation entries until a matching one is found.
370 * @param cls the `struct ValidationEntryMatchContext *`
371 * @param key peer identity (unused)
372 * @param value a `struct ValidationEntry *` to match
373 * @return #GNUNET_YES if the entry does not match,
374 * #GNUNET_NO if the entry does match
377 validation_entry_match (void *cls,
378 const struct GNUNET_PeerIdentity *key,
381 struct ValidationEntryMatchContext *vemc = cls;
382 struct ValidationEntry *ve = value;
384 if (0 == GNUNET_HELLO_address_cmp (ve->address, vemc->address))
394 * A validation entry changed. Update the state and notify
397 * @param ve validation entry that changed
398 * @param state new state
401 validation_entry_changed (struct ValidationEntry *ve,
402 enum GNUNET_TRANSPORT_ValidationState state)
405 GST_clients_broadcast_validation_notification (&ve->pid,
415 * Iterate over validation entries and free them.
417 * @param cls (unused)
418 * @param key peer identity (unused)
419 * @param value a `struct ValidationEntry *` to clean up
420 * @return #GNUNET_YES (continue to iterate)
423 cleanup_validation_entry (void *cls,
424 const struct GNUNET_PeerIdentity *key,
427 struct ValidationEntry *ve = value;
429 ve->next_validation = GNUNET_TIME_absolute_get_zero_();
430 ve->valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
432 /* Notify about deleted entry */
433 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_REMOVE);
437 GST_blacklist_test_cancel (ve->bc);
440 GNUNET_break (GNUNET_OK ==
441 GNUNET_CONTAINER_multipeermap_remove (validation_map,
443 GNUNET_HELLO_address_free (ve->address);
444 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
446 GNUNET_SCHEDULER_cancel (ve->timeout_task);
447 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
449 if (GNUNET_SCHEDULER_NO_TASK != ve->revalidation_task)
451 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
452 ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
454 if ((GNUNET_YES == ve->expecting_pong) &&
455 (validations_running > 0))
457 validations_running --;
458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
459 "Validation finished, %u validation processes running\n",
460 validations_running);
468 * Address validation cleanup task. Assesses if the record is no
469 * longer valid and then possibly triggers its removal.
471 * @param cls the 'struct ValidationEntry'
472 * @param tc scheduler context (unused)
475 timeout_hello_validation (void *cls,
476 const struct GNUNET_SCHEDULER_TaskContext *tc)
478 struct ValidationEntry *ve = cls;
479 struct GNUNET_TIME_Absolute max;
480 struct GNUNET_TIME_Relative left;
482 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
483 max = GNUNET_TIME_absolute_max (ve->valid_until, ve->revalidation_block);
484 left = GNUNET_TIME_absolute_get_remaining (max);
485 if (left.rel_value_us > 0)
487 /* should wait a bit longer */
489 GNUNET_SCHEDULER_add_delayed (left, &timeout_hello_validation, ve);
492 GNUNET_STATISTICS_update (GST_stats,
493 gettext_noop ("# address records discarded"), 1,
495 cleanup_validation_entry (NULL, &ve->pid, ve);
500 * Function called with the result from blacklisting.
501 * Send a PING to the other peer if a communication is allowed.
503 * @param cls our 'struct ValidationEntry'
504 * @param pid identity of the other peer
505 * @param result #GNUNET_OK if the connection is allowed, #GNUNET_NO if not
508 transmit_ping_if_allowed (void *cls,
509 const struct GNUNET_PeerIdentity *pid,
512 struct ValidationEntry *ve = cls;
513 struct TransportPingMessage ping;
514 struct GNUNET_TRANSPORT_PluginFunctions *papi;
515 struct GNUNET_TIME_Absolute next;
516 const struct GNUNET_MessageHeader *hello;
517 enum GNUNET_ATS_Network_Type network;
524 if (GNUNET_NO == result)
526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
527 "Blacklist denies to send PING to `%s' `%s' `%s'\n",
529 GST_plugins_a2s (ve->address),
530 ve->address->transport_name);
534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
535 "Transmitting plain PING to `%s' `%s' `%s'\n",
537 GST_plugins_a2s (ve->address),
538 ve->address->transport_name);
540 next = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
542 if (next.abs_value_us > validation_next.abs_value_us)
543 validation_next = next; /* We're going to send a PING so delay next validation */
545 slen = strlen (ve->address->transport_name) + 1;
546 hello = GST_hello_get ();
547 hsize = ntohs (hello->size);
549 sizeof (struct TransportPingMessage) + ve->address->address_length +
553 htons (sizeof (struct TransportPingMessage) +
554 ve->address->address_length + slen);
555 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
556 ping.challenge = htonl (ve->challenge);
559 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
561 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
563 ("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
564 "HELLO", "PING", (unsigned int) tsize);
565 /* message too big (!?), get rid of HELLO */
568 sizeof (struct TransportPingMessage) + ve->address->address_length +
572 char message_buf[tsize];
574 /* build message with structure:
575 * [HELLO][TransportPingMessage][Transport name][Address] */
576 memcpy (message_buf, hello, hsize);
577 memcpy (&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
578 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
579 ve->address->transport_name, slen);
580 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
581 ve->address->address, ve->address->address_length);
582 papi = GST_plugins_find (ve->address->transport_name);
587 GNUNET_assert (NULL != papi->send);
588 GNUNET_assert (NULL != papi->get_session);
589 struct Session * session = papi->get_session(papi->cls, ve->address);
593 ret = papi->send (papi->cls, session,
595 PING_PRIORITY, ACCEPTABLE_PING_DELAY,
597 network = papi->get_network (papi->cls, session);
598 if (GNUNET_ATS_NET_UNSPECIFIED == network)
600 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
601 "Could not obtain a valid network for `%s' `%s'\n",
602 GNUNET_i2s (pid), GST_plugins_a2s (ve->address));
605 GST_neighbours_notify_data_sent (pid, ve->address, session, tsize);
609 /* Could not get a valid session */
610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Could not get a valid session for `%s' `%s'\n",
611 GNUNET_i2s (pid), GST_plugins_a2s (ve->address));
618 ve->send_time = GNUNET_TIME_absolute_get ();
619 GNUNET_STATISTICS_update (GST_stats,
621 ("# PING without HELLO messages sent"), 1,
624 ve->network = network;
625 ve->expecting_pong = GNUNET_YES;
626 validations_running ++;
627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
628 "Validation started, %u validation processes running\n",
629 validations_running);
630 /* Notify about PING sent */
631 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
637 * Do address validation again to keep address valid.
639 * @param cls the 'struct ValidationEntry'
640 * @param tc scheduler context (unused)
643 revalidate_address (void *cls,
644 const struct GNUNET_SCHEDULER_TaskContext *tc)
646 struct ValidationEntry *ve = cls;
647 struct GNUNET_TIME_Relative canonical_delay;
648 struct GNUNET_TIME_Relative delay;
649 struct GNUNET_TIME_Relative blocked_for;
650 struct GST_BlacklistCheck *bc;
653 ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
654 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
655 /* How long until we can possibly permit the next PING? */
658 GNUNET_YES) ? CONNECTED_PING_FREQUENCY
659 : ((GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us >
660 0) ? VALIDATED_PING_FREQUENCY : UNVALIDATED_PING_KEEPALIVE);
661 if (delay.rel_value_us > canonical_delay.rel_value_us * 2)
663 /* situation changed, recalculate delay */
664 delay = canonical_delay;
665 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
667 if (delay.rel_value_us > 0)
669 /* should wait a bit longer */
670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
671 "Waiting for %s longer before validating address `%s'\n",
672 GNUNET_STRINGS_relative_time_to_string (delay,
674 GST_plugins_a2s (ve->address));
675 ve->revalidation_task =
676 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
677 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), delay);
680 blocked_for = GNUNET_TIME_absolute_get_remaining(validation_next);
681 if ((validations_running > validations_fast_start_threshold) &&
682 (blocked_for.rel_value_us > 0))
684 /* Validations are blocked, have to wait for blocked_for time */
685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
686 "Validations blocked for another %s, delaying validating address `%s'\n",
687 GNUNET_STRINGS_relative_time_to_string (blocked_for,
689 GST_plugins_a2s (ve->address));
690 ve->revalidation_task =
691 GNUNET_SCHEDULER_add_delayed (blocked_for, &revalidate_address, ve);
692 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), blocked_for);
695 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
697 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
699 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
700 canonical_delay.rel_value_us);
702 /* Debug code for mantis 0002726 */
703 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
704 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MICROSECONDS, rdelay).rel_value_us)
707 delay = canonical_delay;
711 delay = GNUNET_TIME_relative_add (canonical_delay,
712 GNUNET_TIME_relative_multiply
713 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
715 /* End debug code for mantis 0002726*/
716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
717 "Validating now, next scheduled for %s, now validating address `%s'\n",
718 GNUNET_STRINGS_relative_time_to_string (blocked_for,
720 GST_plugins_a2s (ve->address));
721 ve->revalidation_task =
722 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
723 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), delay);
725 /* start PINGing by checking blacklist */
726 GNUNET_STATISTICS_update (GST_stats,
727 gettext_noop ("# address revalidations started"), 1,
729 bc = GST_blacklist_test_allowed (&ve->pid, ve->address->transport_name,
730 &transmit_ping_if_allowed, ve);
732 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
738 * Find a ValidationEntry entry for the given neighbour that matches
739 * the given address and transport. If none exists, create one (but
740 * without starting any validation).
742 * @param public_key public key of the peer, NULL for unknown
743 * @param address address to find
744 * @return validation entry matching the given specifications, NULL
745 * if we don't have an existing entry and no public key was given
747 static struct ValidationEntry *
748 find_validation_entry (const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
749 const struct GNUNET_HELLO_Address *address)
751 struct ValidationEntryMatchContext vemc;
752 struct ValidationEntry *ve;
755 vemc.address = address;
756 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
758 &validation_entry_match, &vemc);
759 if (NULL != (ve = vemc.ve))
761 if (public_key == NULL)
763 ve = GNUNET_new (struct ValidationEntry);
764 ve->in_use = GNUNET_SYSERR; /* not defined */
765 ve->address = GNUNET_HELLO_address_copy (address);
766 ve->public_key = *public_key;
767 ve->pid = address->peer;
768 ve->pong_sig_valid_until = GNUNET_TIME_absolute_get_zero_();
769 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
770 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
772 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
774 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
775 &timeout_hello_validation, ve);
776 GNUNET_CONTAINER_multipeermap_put (validation_map, &address->peer,
778 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
779 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
780 ve->expecting_pong = GNUNET_NO;
786 * Iterator which adds the given address to the set of validated
789 * @param cls original HELLO message
790 * @param address the address
791 * @param expiration expiration time
792 * @return #GNUNET_OK (keep the address)
795 add_valid_address (void *cls,
796 const struct GNUNET_HELLO_Address *address,
797 struct GNUNET_TIME_Absolute expiration)
799 const struct GNUNET_HELLO_Message *hello = cls;
800 struct ValidationEntry *ve;
801 struct GNUNET_PeerIdentity pid;
802 struct GNUNET_ATS_Information ats;
803 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
805 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
806 return GNUNET_OK; /* expired */
807 if ((GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid)) ||
808 (GNUNET_OK != GNUNET_HELLO_get_key (hello, &public_key)))
811 return GNUNET_OK; /* invalid HELLO !? */
813 if (0 == memcmp (&GST_my_identity,
815 sizeof (struct GNUNET_PeerIdentity)))
817 /* Peerinfo returned own identity, skip validation */
821 ve = find_validation_entry (&public_key, address);
822 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until, expiration);
824 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
827 "Starting revalidations for valid address `%s'\n",
828 GST_plugins_a2s (ve->address));
829 ve->next_validation = GNUNET_TIME_absolute_get();
830 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
832 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
834 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
835 ats.value = htonl (ve->network);
836 GNUNET_ATS_address_add (GST_ats, address, NULL, &ats, 1);
843 * Function called for any HELLO known to PEERINFO.
846 * @param peer id of the peer, NULL for last call
847 * @param hello hello message for the peer (can be NULL)
848 * @param err_msg error message
851 process_peerinfo_hello (void *cls, const struct GNUNET_PeerIdentity *peer,
852 const struct GNUNET_HELLO_Message *hello,
855 GNUNET_assert (NULL != peer);
858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
859 "Handling HELLO for peer `%s'\n",
861 GNUNET_assert (NULL ==
862 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
869 * Start the validation subsystem.
871 * @param max_fds maximum number of fds to use
874 GST_validation_start (unsigned int max_fds)
877 * Initialization for validation throttling
879 * We have a maximum number max_fds of connections we can use for validation
880 * We monitor the number of validations in parallel and start to throttle it
881 * when doing to many validations in parallel:
882 * if (running validations < (max_fds / 2))
883 * - "fast start": run validation immediately
884 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
885 * (300 sec / ~150 == ~2 sec.) between two validations
888 validation_next = GNUNET_TIME_absolute_get();
889 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
890 validations_fast_start_threshold = (max_fds / 2);
891 validations_running = 0;
892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
893 "Validation uses a fast start threshold of %u connections and a delay between of %s\n ",
894 validations_fast_start_threshold,
895 GNUNET_STRINGS_relative_time_to_string (validation_delay,
897 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
899 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
900 &process_peerinfo_hello, NULL);
905 * Stop the validation subsystem.
908 GST_validation_stop ()
910 struct CheckHelloValidatedContext *chvc;
912 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
913 &cleanup_validation_entry, NULL);
914 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
915 validation_map = NULL;
916 while (NULL != (chvc = chvc_head))
918 GNUNET_CONTAINER_DLL_remove (chvc_head, chvc_tail, chvc);
921 GNUNET_PEERINFO_notify_cancel (pnc);
926 * Send the given PONG to the given address.
928 * @param cls the PONG message
929 * @param public_key public key for the peer, never NULL
930 * @param valid_until is ZERO if we never validated the address,
931 * otherwise a time up to when we consider it (or was) valid
932 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
933 * is ZERO if the address is considered valid (no validation needed)
934 * otherwise a time in the future if we're currently denying re-validation
935 * @param address target address
938 multicast_pong (void *cls,
939 const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
940 struct GNUNET_TIME_Absolute valid_until,
941 struct GNUNET_TIME_Absolute validation_block,
942 const struct GNUNET_HELLO_Address *address)
944 struct TransportPongMessage *pong = cls;
945 struct GNUNET_TRANSPORT_PluginFunctions *papi;
947 papi = GST_plugins_find (address->transport_name);
951 GNUNET_assert (papi->send != NULL);
952 GNUNET_assert (papi->get_session != NULL);
954 struct Session * session = papi->get_session(papi->cls, address);
961 papi->send (papi->cls, session,
962 (const char *) pong, ntohs (pong->header.size),
963 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
965 GST_neighbours_notify_data_sent (&address->peer,
966 address, session, pong->header.size);
972 * We've received a PING. If appropriate, generate a PONG.
974 * @param sender peer sending the PING
975 * @param hdr the PING
976 * @param sender_address the sender address as we got it
977 * @param session session we got the PING from
978 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
981 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
982 const struct GNUNET_MessageHeader *hdr,
983 const struct GNUNET_HELLO_Address *sender_address,
984 struct Session *session)
986 const struct TransportPingMessage *ping;
987 struct TransportPongMessage *pong;
988 struct GNUNET_TRANSPORT_PluginFunctions *papi;
989 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
990 struct GNUNET_TIME_Absolute *sig_cache_exp;
998 int buggy = GNUNET_NO;
999 struct GNUNET_HELLO_Address address;
1001 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1003 GNUNET_break_op (0);
1004 return GNUNET_SYSERR;
1006 ping = (const struct TransportPingMessage *) hdr;
1008 memcmp (&ping->target, &GST_my_identity,
1009 sizeof (struct GNUNET_PeerIdentity)))
1011 GNUNET_STATISTICS_update (GST_stats,
1013 ("# PING message for different peer received"), 1,
1015 return GNUNET_SYSERR;
1017 GNUNET_STATISTICS_update (GST_stats,
1018 gettext_noop ("# PING messages received"), 1,
1020 addr = (const char *) &ping[1];
1021 alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1022 /* peer wants to confirm that this is one of our addresses, this is what is
1023 * used for address validation */
1026 sig_cache_exp = NULL;
1030 addrend = memchr (addr, '\0', alen);
1031 if (NULL == addrend)
1033 GNUNET_break_op (0);
1034 return GNUNET_SYSERR;
1037 slen = strlen (addr) + 1;
1039 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1040 address.address = addrend;
1041 address.address_length = alen;
1042 address.transport_name = addr;
1043 address.peer = GST_my_identity;
1045 if (NULL == address.transport_name)
1050 if (0 != strstr (address.transport_name, "_client"))
1052 plugin_name = GNUNET_strdup (address.transport_name);
1053 pos = strstr (plugin_name, "_client");
1054 GNUNET_assert (NULL != pos);
1055 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1058 plugin_name = GNUNET_strdup (address.transport_name);
1060 if (NULL == (papi = GST_plugins_find (plugin_name)))
1062 /* we don't have the plugin for this address */
1063 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1064 _("Plugin `%s' not available, cannot confirm having this address\n"),
1066 GNUNET_free (plugin_name);
1067 return GNUNET_SYSERR;
1069 GNUNET_free (plugin_name);
1070 if (GNUNET_OK != papi->check_address (papi->cls, addrend, alen))
1072 GNUNET_STATISTICS_update (GST_stats,
1074 ("# failed address checks during validation"), 1,
1076 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1077 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1078 GST_plugins_a2s (&address));
1079 return GNUNET_SYSERR;
1083 GNUNET_STATISTICS_update (GST_stats,
1085 ("# successful address checks during validation"), 1,
1087 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1088 "Address `%s' is one of my addresses, confirming PING\n",
1089 GST_plugins_a2s (&address));
1092 if (GNUNET_YES != GST_hello_test_address (&address, &sig_cache, &sig_cache_exp))
1094 if (GNUNET_NO == buggy)
1096 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1097 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1098 GNUNET_i2s (sender),
1099 GST_plugins_a2s (&address));
1100 return GNUNET_SYSERR;
1104 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1105 _("Received a PING message with validation bug from `%s'\n"),
1106 GNUNET_i2s (sender));
1112 addrend = NULL; /* make gcc happy */
1114 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1115 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1117 sig_cache = &no_address_signature;
1118 sig_cache_exp = &no_address_signature_expiration;
1121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1122 "I am `%s', sending PONG to peer `%s'\n",
1123 GNUNET_i2s_full (&GST_my_identity),
1124 GNUNET_i2s (sender));
1126 /* message with structure:
1127 * [TransportPongMessage][Transport name][Address] */
1129 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
1131 htons (sizeof (struct TransportPongMessage) + alen + slen);
1132 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1133 pong->purpose.size =
1134 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1135 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1137 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1138 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1139 pong->addrlen = htonl (alen + slen);
1140 memcpy (&pong[1], addr, slen); /* Copy transport plugin */
1143 GNUNET_assert (NULL != addrend);
1144 memcpy (&((char *) &pong[1])[slen], addrend, alen);
1146 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1147 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1149 /* create / update cached sig */
1150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1151 "Creating PONG signature to indicate ownership.\n");
1152 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1153 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1155 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1158 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1159 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1164 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1166 pong->signature = *sig_cache;
1168 GNUNET_assert (sender_address != NULL);
1170 /* first see if the session we got this PING from can be used to transmit
1171 * a response reliably */
1176 GNUNET_assert (papi->send != NULL);
1177 GNUNET_assert (papi->get_session != NULL);
1179 if (session == NULL)
1181 session = papi->get_session (papi->cls, sender_address);
1183 if (session == NULL)
1190 ret = papi->send (papi->cls, session,
1191 (const char *) pong, ntohs (pong->header.size),
1192 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1195 GST_neighbours_notify_data_sent (sender,
1196 sender_address, session,
1202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1203 "Transmitted PONG to `%s' via reliable mechanism\n",
1204 GNUNET_i2s (sender));
1206 GNUNET_STATISTICS_update (GST_stats,
1208 ("# PONGs unicast via reliable transport"), 1,
1214 /* no reliable method found, try transmission via all known addresses */
1215 GNUNET_STATISTICS_update (GST_stats,
1217 ("# PONGs multicast to all available addresses"), 1,
1219 GST_validation_get_addresses (sender,
1220 &multicast_pong, pong);
1227 * Context for the #validate_address_iterator() function
1229 struct ValidateAddressContext
1232 * Hash of the public key of the peer whose address is being validated.
1234 struct GNUNET_PeerIdentity pid;
1237 * Public key of the peer whose address is being validated.
1239 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
1245 * Iterator callback to go over all addresses and try to validate them
1246 * (unless blocked or already validated).
1248 * @param cls pointer to a `struct ValidateAddressContext *`
1249 * @param address the address
1250 * @param expiration expiration time
1251 * @return #GNUNET_OK (keep the address)
1254 validate_address_iterator (void *cls,
1255 const struct GNUNET_HELLO_Address *address,
1256 struct GNUNET_TIME_Absolute expiration)
1258 const struct ValidateAddressContext *vac = cls;
1259 struct ValidationEntry *ve;
1261 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1264 "Skipping expired address from HELLO\n");
1265 return GNUNET_OK; /* expired */
1267 ve = find_validation_entry (&vac->public_key, address);
1268 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
1270 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1271 "Validation process started for fresh address `%s'\n",
1272 GST_plugins_a2s (ve->address));
1273 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1280 * Add the validated peer address to the HELLO.
1282 * @param cls the `struct ValidationEntry *` with the validated address
1283 * @param max space in @a buf
1284 * @param buf where to add the address
1285 * @return number of bytes written, #GNUNET_SYSERR to signal the
1286 * end of the iteration.
1289 add_valid_peer_address (void *cls,
1293 struct ValidationEntry *ve = cls;
1295 if (GNUNET_YES == ve->copied)
1296 return GNUNET_SYSERR; /* Done */
1297 ve->copied = GNUNET_YES;
1298 return GNUNET_HELLO_add_address (ve->address, ve->valid_until, buf, max);
1303 * We've received a PONG. Check if it matches a pending PING and
1304 * mark the respective address as confirmed.
1306 * @param sender peer sending the PONG
1307 * @param hdr the PONG
1308 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1311 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1312 const struct GNUNET_MessageHeader *hdr)
1314 const struct TransportPongMessage *pong;
1315 struct ValidationEntry *ve;
1321 struct GNUNET_HELLO_Message *hello;
1322 struct GNUNET_HELLO_Address address;
1326 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1328 GNUNET_break_op (0);
1329 return GNUNET_SYSERR;
1331 GNUNET_STATISTICS_update (GST_stats,
1332 gettext_noop ("# PONG messages received"), 1,
1335 /* message with structure:
1336 * [TransportPongMessage][Transport name][Address] */
1338 pong = (const struct TransportPongMessage *) hdr;
1339 tname = (const char *) &pong[1];
1340 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1341 addr = memchr (tname, '\0', size);
1344 GNUNET_break_op (0);
1345 return GNUNET_SYSERR;
1348 slen = strlen (tname) + 1;
1349 addrlen = size - slen;
1350 address.peer = *sender;
1351 address.address = addr;
1352 address.address_length = addrlen;
1353 address.transport_name = tname;
1354 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1355 ve = find_validation_entry (NULL, &address);
1356 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1358 GNUNET_STATISTICS_update (GST_stats,
1360 ("# PONGs dropped, no matching pending validation"),
1364 /* now check that PONG is well-formed */
1365 if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
1367 GNUNET_break_op (0);
1368 return GNUNET_SYSERR;
1370 if (GNUNET_TIME_absolute_get_remaining
1371 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us == 0)
1373 GNUNET_STATISTICS_update (GST_stats,
1375 ("# PONGs dropped, signature expired"), 1,
1377 return GNUNET_SYSERR;
1380 sig_res = GNUNET_SYSERR;
1381 do_verify = GNUNET_YES;
1382 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1384 /* We have a cached and valid signature for this peer,
1385 * try to compare instead of verify */
1386 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1388 /* signatures are identical, we can skip verification */
1389 sig_res = GNUNET_OK;
1390 do_verify = GNUNET_NO;
1394 sig_res = GNUNET_SYSERR;
1395 /* signatures do not match, we have to verify */
1399 if (GNUNET_YES == do_verify)
1401 /* Do expensive verification */
1402 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1403 &pong->purpose, &pong->signature,
1405 if (sig_res == GNUNET_SYSERR)
1407 GNUNET_break_op (0);
1408 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1409 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1411 GST_plugins_a2s (ve->address),
1412 GNUNET_i2s (sender));
1415 if (sig_res == GNUNET_SYSERR)
1417 GNUNET_break_op (0);
1418 return GNUNET_SYSERR;
1421 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1422 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1423 GNUNET_i2s (sender),
1425 GST_plugins_a2s (ve->address));
1426 /* validity achieved, remember it! */
1427 ve->expecting_pong = GNUNET_NO;
1428 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1429 ve->pong_sig_cache = pong->signature;
1430 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1431 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1433 struct GNUNET_ATS_Information ats[2];
1435 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1436 ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
1437 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1438 ats[1].value = htonl ((uint32_t) ve->network);
1439 GNUNET_ATS_address_add (GST_ats, ve->address, NULL, ats, 2);
1441 if (validations_running > 0)
1443 validations_running --;
1444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1445 "Validation finished, %u validation processes running\n",
1446 validations_running);
1453 /* Notify about new validity */
1454 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1456 /* build HELLO to store in PEERINFO */
1457 ve->copied = GNUNET_NO;
1458 hello = GNUNET_HELLO_create (&ve->public_key,
1459 &add_valid_peer_address, ve,
1461 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1462 GNUNET_free (hello);
1468 * We've received a HELLO, check which addresses are new and trigger
1471 * @param hello the HELLO we received
1472 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1475 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1477 const struct GNUNET_HELLO_Message *hm =
1478 (const struct GNUNET_HELLO_Message *) hello;
1479 struct ValidateAddressContext vac;
1480 struct GNUNET_HELLO_Message *h;
1483 friend = GNUNET_HELLO_is_friend_only (hm);
1484 if ( ( (GNUNET_YES != friend) &&
1485 (GNUNET_NO != friend) ) ||
1486 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
1487 (GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
1489 /* malformed HELLO */
1490 GNUNET_break_op (0);
1491 return GNUNET_SYSERR;
1494 memcmp (&GST_my_identity, &vac.pid, sizeof (struct GNUNET_PeerIdentity)))
1496 /* Add peer identity without addresses to peerinfo service */
1497 h = GNUNET_HELLO_create (&vac.public_key, NULL, NULL, friend);
1498 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1499 _("Validation received new %s message for peer `%s' with size %u\n"),
1501 GNUNET_i2s (&vac.pid),
1502 ntohs (hello->size));
1503 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1506 _("Adding `%s' without addresses for peer `%s'\n"), "HELLO",
1507 GNUNET_i2s (&vac.pid));
1510 GNUNET_assert (NULL ==
1511 GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
1512 &validate_address_iterator,
1519 * Closure for #iterate_addresses().
1521 struct IteratorContext
1524 * Function to call on each address.
1526 GST_ValidationAddressCallback cb;
1529 * Closure for @e cb.
1537 * Call the callback in the closure for each validation entry.
1539 * @param cls the `struct IteratorContext`
1540 * @param key the peer's identity
1541 * @param value the `struct ValidationEntry`
1542 * @return #GNUNET_OK (continue to iterate)
1545 iterate_addresses (void *cls,
1546 const struct GNUNET_PeerIdentity *key,
1549 struct IteratorContext *ic = cls;
1550 struct ValidationEntry *ve = value;
1552 ic->cb (ic->cb_cls, &ve->public_key, ve->valid_until, ve->revalidation_block,
1559 * Call the given function for each address for the given target.
1560 * Can either give a snapshot (synchronous API) or be continuous.
1562 * @param target peer information is requested for
1563 * @param cb function to call; will not be called after this function returns
1564 * @param cb_cls closure for @a cb
1567 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1568 GST_ValidationAddressCallback cb, void *cb_cls)
1570 struct IteratorContext ic;
1574 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1576 &iterate_addresses, &ic);
1581 * Update if we are using an address for a connection actively right now.
1582 * Based on this, the validation module will measure latency for the
1583 * address more or less often.
1585 * @param address the address
1586 * @param session the session
1587 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1588 * #GNUNET_NO if we are no longer using the address for a connection
1591 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1592 struct Session *session,
1595 struct ValidationEntry *ve;
1597 if (NULL != address)
1598 ve = find_validation_entry (NULL, address);
1600 ve = NULL; /* FIXME: lookup based on session... */
1603 /* this can happen for inbound connections (sender_address_len == 0); */
1606 if (ve->in_use == in_use)
1609 if (GNUNET_YES == in_use)
1611 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1612 "Error setting address in use for peer `%s' `%s' to USED\n",
1613 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
1615 if (GNUNET_NO == in_use)
1617 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1618 "Error setting address in use for peer `%s' `%s' to NOT_USED\n",
1619 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
1623 GNUNET_break (ve->in_use != in_use); /* should be different... */
1624 ve->in_use = in_use;
1625 if (in_use == GNUNET_YES)
1627 /* from now on, higher frequeny, so reschedule now */
1628 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1629 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1635 * Query validation about the latest observed latency on a given
1638 * @param sender peer
1639 * @param address the address
1640 * @param session session
1641 * @return observed latency of the address, FOREVER if the address was
1642 * never successfully validated
1644 struct GNUNET_TIME_Relative
1645 GST_validation_get_address_latency (const struct GNUNET_PeerIdentity *sender,
1646 const struct GNUNET_HELLO_Address *address,
1647 struct Session *session)
1649 struct ValidationEntry *ve;
1651 if (NULL == address)
1653 GNUNET_break (0); // FIXME: support having latency only with session...
1654 return GNUNET_TIME_UNIT_FOREVER_REL;
1656 ve = find_validation_entry (NULL, address);
1658 return GNUNET_TIME_UNIT_FOREVER_REL;
1663 * Closure for the validation_entries_iterate function.
1665 struct ValidationIteratorContext
1668 * Function to call on each validation entry
1670 GST_ValidationChangedCallback cb;
1673 * Closure for @e cb.
1680 validation_entries_iterate (void *cls,
1681 const struct GNUNET_PeerIdentity *key,
1684 struct ValidationIteratorContext *ic = cls;
1685 struct ValidationEntry *ve = value;
1687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Notifying about validation entry for peer `%s' address `%s' \n",
1688 GNUNET_i2s (&ve->pid), GST_plugins_a2s (ve->address));
1689 ic->cb (ic->cb_cls, &ve->pid, ve->address, ve->send_time,
1690 ve->valid_until, ve->next_validation, ve->state);
1696 * Iterate over all iteration entries
1698 * @param cb function to call
1699 * @param cb_cls closure for cb
1702 GST_validation_iterate (GST_ValidationChangedCallback cb,
1705 struct ValidationIteratorContext ic;
1707 if (NULL == validation_map)
1708 return; /* can happen during shutdown */
1711 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1712 &validation_entries_iterate,
1716 /* end of file gnunet-service-transport_validation.c */