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3 (C) 2010-2015 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_ats.h"
28 #include "gnunet-service-transport_blacklist.h"
29 #include "gnunet-service-transport_clients.h"
30 #include "gnunet-service-transport_hello.h"
31 #include "gnunet-service-transport_neighbours.h"
32 #include "gnunet-service-transport_plugins.h"
33 #include "gnunet-service-transport_validation.h"
34 #include "gnunet-service-transport.h"
35 #include "gnunet_hello_lib.h"
36 #include "gnunet_ats_service.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_signatures.h"
42 * How long is a PONG signature valid? We'll recycle a signature until
43 * 1/4 of this time is remaining. PONGs should expire so that if our
44 * external addresses change an adversary cannot replay them indefinitely.
45 * OTOH, we don't want to spend too much time generating PONG signatures,
46 * so they must have some lifetime to reduce our CPU usage.
48 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
51 * After how long do we expire an address in a HELLO that we just
52 * validated? This value is also used for our own addresses when we
55 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
58 * How often do we allow PINGing an address that we have not yet
59 * validated? This also determines how long we track an address that
60 * we cannot validate (because after this time we can destroy the
63 #define UNVALIDATED_PING_KEEPALIVE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
66 * How often do we PING an address that we have successfully validated
67 * in the past but are not actively using? Should be (significantly)
68 * smaller than HELLO_ADDRESS_EXPIRATION.
70 #define VALIDATED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
73 * How often do we PING an address that we are currently using?
75 #define CONNECTED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
78 * How much delay is acceptable for sending the PING or PONG?
80 #define ACCEPTABLE_PING_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
83 * Size of the validation map hashmap.
85 #define VALIDATION_MAP_SIZE 256
88 * Priority to use for PINGs
90 #define PING_PRIORITY 2
93 * Priority to use for PONGs
95 #define PONG_PRIORITY 4
98 GNUNET_NETWORK_STRUCT_BEGIN
101 * Message used to ask a peer to validate receipt (to check an address
102 * from a HELLO). Followed by the address we are trying to validate,
103 * or an empty address if we are just sending a PING to confirm that a
104 * connection which the receiver (of the PING) initiated is still valid.
106 struct TransportPingMessage
110 * Type will be #GNUNET_MESSAGE_TYPE_TRANSPORT_PING
112 struct GNUNET_MessageHeader header;
115 * Challenge code (to ensure fresh reply).
117 uint32_t challenge GNUNET_PACKED;
120 * Who is the intended recipient?
122 struct GNUNET_PeerIdentity target;
128 * Message used to validate a HELLO. The challenge is included in the
129 * confirmation to make matching of replies to requests possible. The
130 * signature signs our public key, an expiration time and our address.<p>
132 * This message is followed by our transport address that the PING tried
133 * to confirm (if we liked it). The address can be empty (zero bytes)
134 * if the PING had not address either (and we received the request via
135 * a connection that we initiated).
137 struct TransportPongMessage
141 * Type will be #GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
143 struct GNUNET_MessageHeader header;
146 * Challenge code from PING (showing freshness). Not part of what
147 * is signed so that we can re-use signatures.
149 uint32_t challenge GNUNET_PACKED;
154 struct GNUNET_CRYPTO_EddsaSignature signature;
157 * #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
158 * plausible address for the signing peer.
160 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
163 * When does this signature expire?
165 struct GNUNET_TIME_AbsoluteNBO expiration;
168 * Size of address appended to this message (part of what is
169 * being signed, hence not redundant).
171 uint32_t addrlen GNUNET_PACKED;
174 GNUNET_NETWORK_STRUCT_END
177 * Information about an address under validation
179 struct ValidationEntry
185 struct GNUNET_HELLO_Address *address;
188 * Handle to the blacklist check (if we're currently in it).
190 struct GST_BlacklistCheck *bc;
193 * Cached PONG signature
195 struct GNUNET_CRYPTO_EddsaSignature pong_sig_cache;
198 * ID of task that will clean up this entry if nothing happens.
200 struct GNUNET_SCHEDULER_Task *timeout_task;
203 * ID of task that will trigger address revalidation.
205 struct GNUNET_SCHEDULER_Task *revalidation_task;
208 * At what time did we send the latest validation request (PING)?
210 struct GNUNET_TIME_Absolute send_time;
213 * At what time do we send the next validation request (PING)?
215 struct GNUNET_TIME_Absolute next_validation;
218 * Until when is this address valid?
219 * ZERO if it is not currently considered valid.
221 struct GNUNET_TIME_Absolute valid_until;
224 * Until when is the cached PONG signature valid?
225 * ZERO if it is not currently considered valid.
227 struct GNUNET_TIME_Absolute pong_sig_valid_until;
230 * How long until we can try to validate this address again?
231 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
232 * ZERO if the address is considered valid (no validation needed)
233 * otherwise a time in the future if we're currently denying re-validation
235 struct GNUNET_TIME_Absolute revalidation_block;
238 * Last observed latency for this address (round-trip), delay between
239 * last PING sent and PONG received; FOREVER if we never got a PONG.
241 struct GNUNET_TIME_Relative latency;
244 * Current state of this validation entry
246 enum GNUNET_TRANSPORT_ValidationState state;
249 * Challenge number we used.
254 * When passing the address in #add_valid_peer_address(), did we
255 * copy the address to the HELLO yet?
260 * Are we currently using this address for a connection?
265 * Are we expecting a PONG message for this validation entry?
270 * Is this address known to ATS as valid right now?
275 * Which network type does our address belong to?
277 enum GNUNET_ATS_Network_Type network;
282 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
283 * of the given peer that we are currently validating, have validated
284 * or are blocked from re-validation for a while).
286 static struct GNUNET_CONTAINER_MultiPeerMap *validation_map;
289 * Context for peerinfo iteration.
291 static struct GNUNET_PEERINFO_NotifyContext *pnc;
294 * Minimum delay between to validations
296 static struct GNUNET_TIME_Relative validation_delay;
299 * Number of validations running; any PING that was not yet
300 * matched by a PONG and for which we have not yet hit the
301 * timeout is considered a running 'validation'.
303 static unsigned int validations_running;
306 * Validition fast start threshold
308 static unsigned int validations_fast_start_threshold;
311 * When is next validation allowed
313 static struct GNUNET_TIME_Absolute validation_next;
317 * Context for the validation entry match function.
319 struct ValidationEntryMatchContext
322 * Where to store the result?
324 struct ValidationEntry *ve;
327 * Address we're interested in.
329 const struct GNUNET_HELLO_Address *address;
335 * Provide an update on the `validation_map` map size to statistics.
336 * This function should be called whenever the `validation_map`
340 publish_ve_stat_update ()
342 GNUNET_STATISTICS_set (GST_stats,
343 gettext_noop ("# Addresses in validation map"),
344 GNUNET_CONTAINER_multipeermap_size (validation_map),
350 * Iterate over validation entries until a matching one is found.
352 * @param cls the `struct ValidationEntryMatchContext *`
353 * @param key peer identity (unused)
354 * @param value a `struct ValidationEntry *` to match
355 * @return #GNUNET_YES if the entry does not match,
356 * #GNUNET_NO if the entry does match
359 validation_entry_match (void *cls,
360 const struct GNUNET_PeerIdentity *key,
363 struct ValidationEntryMatchContext *vemc = cls;
364 struct ValidationEntry *ve = value;
366 if (0 == GNUNET_HELLO_address_cmp (ve->address,
377 * A validation entry changed. Update the state and notify
380 * @param ve validation entry that changed
381 * @param state new state
384 validation_entry_changed (struct ValidationEntry *ve,
385 enum GNUNET_TRANSPORT_ValidationState state)
388 GST_clients_broadcast_validation_notification (&ve->address->peer,
398 * Iterate over validation entries and free them.
400 * @param cls (unused)
401 * @param key peer identity (unused)
402 * @param value a `struct ValidationEntry *` to clean up
403 * @return #GNUNET_YES (continue to iterate)
406 cleanup_validation_entry (void *cls,
407 const struct GNUNET_PeerIdentity *key,
410 struct ValidationEntry *ve = value;
412 ve->next_validation = GNUNET_TIME_UNIT_ZERO_ABS;
413 ve->valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
415 /* Notify about deleted entry */
416 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_REMOVE);
420 GST_blacklist_test_cancel (ve->bc);
423 GNUNET_break (GNUNET_OK ==
424 GNUNET_CONTAINER_multipeermap_remove (validation_map,
427 publish_ve_stat_update ();
428 if (GNUNET_YES == ve->known_to_ats)
430 GST_ats_expire_address (ve->address);
431 ve->known_to_ats = GNUNET_NO;
433 GNUNET_HELLO_address_free (ve->address);
434 if (NULL != ve->timeout_task)
436 GNUNET_SCHEDULER_cancel (ve->timeout_task);
437 ve->timeout_task = NULL;
439 if (NULL != ve->revalidation_task)
441 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
442 ve->revalidation_task = NULL;
444 if ( (GNUNET_YES == ve->expecting_pong) &&
445 (validations_running > 0) )
447 validations_running--;
448 GNUNET_STATISTICS_set (GST_stats,
449 gettext_noop ("# validations running"),
452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
453 "Validation finished, %u validation processes running\n",
454 validations_running);
462 * Address validation cleanup task. Assesses if the record is no
463 * longer valid and then possibly triggers its removal.
465 * @param cls the `struct ValidationEntry`
466 * @param tc scheduler context (unused)
469 timeout_hello_validation (void *cls,
470 const struct GNUNET_SCHEDULER_TaskContext *tc)
472 struct ValidationEntry *ve = cls;
473 struct GNUNET_TIME_Absolute max;
474 struct GNUNET_TIME_Relative left;
476 ve->timeout_task = NULL;
477 max = GNUNET_TIME_absolute_max (ve->valid_until,
478 ve->revalidation_block);
479 left = GNUNET_TIME_absolute_get_remaining (max);
480 if (left.rel_value_us > 0)
482 /* should wait a bit longer */
484 GNUNET_SCHEDULER_add_delayed (left, &timeout_hello_validation, ve);
487 GNUNET_STATISTICS_update (GST_stats,
488 gettext_noop ("# address records discarded"), 1,
490 cleanup_validation_entry (NULL, &ve->address->peer, ve);
495 * Function called with the result from blacklisting.
496 * Send a PING to the other peer if a communication is allowed.
498 * @param cls our `struct ValidationEntry`
499 * @param pid identity of the other peer
500 * @param result #GNUNET_OK if the connection is allowed, #GNUNET_NO if not
503 transmit_ping_if_allowed (void *cls,
504 const struct GNUNET_PeerIdentity *pid,
507 struct ValidationEntry *ve = cls;
508 struct TransportPingMessage ping;
509 struct GNUNET_TRANSPORT_PluginFunctions *papi;
510 struct GNUNET_TIME_Absolute next;
511 const struct GNUNET_MessageHeader *hello;
512 enum GNUNET_ATS_Network_Type network;
519 if (GNUNET_NO == result)
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
522 "Blacklist denies to send PING to `%s' `%s' `%s'\n",
524 GST_plugins_a2s (ve->address),
525 ve->address->transport_name);
526 cleanup_validation_entry (NULL, pid, ve);
530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
531 "Transmitting plain PING to `%s' `%s' `%s'\n",
533 GST_plugins_a2s (ve->address),
534 ve->address->transport_name);
536 slen = strlen (ve->address->transport_name) + 1;
537 hello = GST_hello_get ();
538 hsize = ntohs (hello->size);
540 sizeof (struct TransportPingMessage) + ve->address->address_length +
544 htons (sizeof (struct TransportPingMessage) +
545 ve->address->address_length + slen);
546 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
547 ping.challenge = htonl (ve->challenge);
550 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
555 sizeof (struct TransportPingMessage) + ve->address->address_length +
559 char message_buf[tsize];
561 /* build message with structure:
562 * [HELLO][TransportPingMessage][Transport name][Address] */
563 memcpy (message_buf, hello, hsize);
564 memcpy (&message_buf[hsize],
566 sizeof (struct TransportPingMessage));
567 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
568 ve->address->transport_name,
570 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
571 ve->address->address,
572 ve->address->address_length);
573 papi = GST_plugins_find (ve->address->transport_name);
574 GNUNET_assert (NULL != papi);
575 GNUNET_assert (NULL != papi->send);
576 struct Session *session = papi->get_session (papi->cls,
581 ret = papi->send (papi->cls, session,
584 ACCEPTABLE_PING_DELAY,
586 network = papi->get_network (papi->cls, session);
587 if (GNUNET_ATS_NET_UNSPECIFIED == network)
589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
590 "Could not obtain a valid network for `%s' `%s'\n",
592 GST_plugins_a2s (ve->address));
595 GST_neighbours_notify_data_sent (ve->address, session, tsize);
599 /* Could not get a valid session */
600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
601 "Could not get a valid session for `%s' `%s'\n",
603 GST_plugins_a2s (ve->address));
609 next = GNUNET_TIME_relative_to_absolute (validation_delay);
610 validation_next = GNUNET_TIME_absolute_max (next,
612 ve->send_time = GNUNET_TIME_absolute_get ();
613 GNUNET_STATISTICS_update (GST_stats,
614 gettext_noop ("# PINGs for address validation sent"),
617 ve->network = network;
618 ve->expecting_pong = GNUNET_YES;
619 validations_running++;
620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
621 "Validation started, %u validation processes running\n",
622 validations_running);
623 GNUNET_STATISTICS_set (GST_stats,
624 gettext_noop ("# validations running"),
627 /* Notify about PING sent */
628 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
634 * Do address validation again to keep address valid.
636 * @param cls the `struct ValidationEntry`
637 * @param tc scheduler context (unused)
640 revalidate_address (void *cls,
641 const struct GNUNET_SCHEDULER_TaskContext *tc)
643 struct ValidationEntry *ve = cls;
644 struct GNUNET_TIME_Relative canonical_delay;
645 struct GNUNET_TIME_Relative delay;
646 struct GNUNET_TIME_Relative blocked_for;
647 struct GST_BlacklistCheck *bc;
650 ve->revalidation_task = NULL;
651 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
652 /* Considering current connectivity situation, what is the maximum
653 block period permitted? */
654 if (GNUNET_YES == ve->in_use)
655 canonical_delay = CONNECTED_PING_FREQUENCY;
656 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
657 canonical_delay = VALIDATED_PING_FREQUENCY;
659 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
660 /* Use delay that is MIN of original delay and possibly adjusted
661 new maximum delay (which may be lower); the real delay
662 is originally randomized between "canonical_delay" and "2 * canonical_delay",
663 so continue to permit that window for the operation. */
664 delay = GNUNET_TIME_relative_min (delay,
665 GNUNET_TIME_relative_multiply (canonical_delay,
667 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
668 if (delay.rel_value_us > 0)
670 /* should wait a bit longer */
671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
672 "Waiting for %s longer before validating address `%s'\n",
673 GNUNET_STRINGS_relative_time_to_string (delay,
675 GST_plugins_a2s (ve->address));
676 ve->revalidation_task =
677 GNUNET_SCHEDULER_add_delayed (delay,
678 &revalidate_address, ve);
679 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
682 /* check if globally we have too many active validations at a
683 too high rate, if so, delay ours */
684 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
685 if ( (validations_running > validations_fast_start_threshold) &&
686 (blocked_for.rel_value_us > 0) )
688 /* Validations are blocked, have to wait for blocked_for time */
689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
690 "Validations blocked for another %s, delaying validating address `%s'\n",
691 GNUNET_STRINGS_relative_time_to_string (blocked_for,
693 GST_plugins_a2s (ve->address));
694 GNUNET_STATISTICS_update (GST_stats,
695 gettext_noop ("# validations delayed by global throttle"),
698 ve->revalidation_task =
699 GNUNET_SCHEDULER_add_delayed (blocked_for, &revalidate_address, ve);
700 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
704 /* We are good to go; remember to not go again for `canonical_delay` time;
705 add up to `canonical_delay` to randomize start time */
706 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
707 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
709 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
710 canonical_delay.rel_value_us);
712 delay = GNUNET_TIME_relative_add (canonical_delay,
713 GNUNET_TIME_relative_multiply
714 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
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_relative_to_absolute (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->address->peer,
730 ve->address->transport_name,
731 &transmit_ping_if_allowed, ve);
733 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
739 * Find a ValidationEntry entry for the given neighbour that matches
740 * the given address and transport. If none exists, create one (but
741 * without starting any validation).
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_HELLO_Address *address)
750 struct ValidationEntryMatchContext vemc;
751 struct ValidationEntry *ve;
754 vemc.address = address;
755 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
757 &validation_entry_match, &vemc);
758 if (NULL != (ve = vemc.ve))
760 ve = GNUNET_new (struct ValidationEntry);
761 ve->in_use = GNUNET_SYSERR; /* not defined */
762 ve->address = GNUNET_HELLO_address_copy (address);
763 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
764 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
765 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
767 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
769 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
770 &timeout_hello_validation, ve);
771 GNUNET_CONTAINER_multipeermap_put (validation_map, &address->peer,
773 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
774 publish_ve_stat_update ();
775 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
781 * Iterator which adds the given address to the set of validated
784 * @param cls original HELLO message
785 * @param address the address
786 * @param expiration expiration time
787 * @return #GNUNET_OK (keep the address), could return
788 * #GNUNET_NO (delete address, but this is ignored);
789 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
792 add_valid_address (void *cls,
793 const struct GNUNET_HELLO_Address *address,
794 struct GNUNET_TIME_Absolute expiration)
796 const struct GNUNET_HELLO_Message *hello = cls;
797 struct ValidationEntry *ve;
798 struct GNUNET_PeerIdentity pid;
799 struct GNUNET_ATS_Information ats;
801 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
802 return GNUNET_OK; /* expired */
803 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
806 return GNUNET_OK; /* invalid HELLO !? */
808 if (NULL == GST_plugins_find (address->transport_name))
810 /* might have been valid in the past, but we don't have that
811 plugin loaded right now */
815 ve = find_validation_entry (address);
816 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
818 if (NULL == ve->revalidation_task)
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "Starting revalidations for valid address `%s'\n",
822 GST_plugins_a2s (ve->address));
823 ve->next_validation = GNUNET_TIME_absolute_get();
824 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
826 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
828 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
829 ats.value = htonl (ve->network);
830 if (GNUNET_YES != ve->known_to_ats)
832 ve->known_to_ats = GNUNET_YES;
833 GST_ats_add_address (address, NULL, &ats, 1);
840 * Function called for any HELLO known to PEERINFO.
842 * @param cls unused (NULL)
843 * @param peer id of the peer, NULL for last call (during iteration,
844 * as we are monitoring, this should never happen)
845 * @param hello hello message for the peer (can be NULL)
846 * @param err_msg error message
849 process_peerinfo_hello (void *cls,
850 const struct GNUNET_PeerIdentity *peer,
851 const struct GNUNET_HELLO_Message *hello,
854 GNUNET_assert (NULL != peer);
857 if (0 == memcmp (&GST_my_identity,
859 sizeof (struct GNUNET_PeerIdentity)))
861 /* Peerinfo returned own identity, skip validation */
864 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
865 "Handling HELLO for peer `%s'\n",
867 GNUNET_assert (NULL ==
868 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
875 * Start the validation subsystem.
877 * @param max_fds maximum number of fds to use
880 GST_validation_start (unsigned int max_fds)
883 * Initialization for validation throttling
885 * We have a maximum number max_fds of connections we can use for validation
886 * We monitor the number of validations in parallel and start to throttle it
887 * when doing to many validations in parallel:
888 * if (running validations < (max_fds / 2))
889 * - "fast start": run validation immediately
890 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
891 * (300 sec / ~150 == ~2 sec.) between two validations
894 validation_next = GNUNET_TIME_absolute_get();
895 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
896 validations_fast_start_threshold = (max_fds / 2);
897 validations_running = 0;
898 GNUNET_STATISTICS_set (GST_stats,
899 gettext_noop ("# validations running"),
902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
903 "Validation uses a fast start threshold of %u connections and a delay between of %s\n ",
904 validations_fast_start_threshold,
905 GNUNET_STRINGS_relative_time_to_string (validation_delay,
907 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
909 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
910 &process_peerinfo_hello, NULL);
915 * Stop the validation subsystem.
918 GST_validation_stop ()
920 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
921 &cleanup_validation_entry,
923 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
924 validation_map = NULL;
925 GNUNET_PEERINFO_notify_cancel (pnc);
930 * Send the given PONG to the given address.
932 * @param cls the PONG message
933 * @param valid_until is ZERO if we never validated the address,
934 * otherwise a time up to when we consider it (or was) valid
935 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
936 * is ZERO if the address is considered valid (no validation needed)
937 * otherwise a time in the future if we're currently denying re-validation
938 * @param address target address
941 multicast_pong (void *cls,
942 struct GNUNET_TIME_Absolute valid_until,
943 struct GNUNET_TIME_Absolute validation_block,
944 const struct GNUNET_HELLO_Address *address)
946 struct TransportPongMessage *pong = cls;
947 struct GNUNET_TRANSPORT_PluginFunctions *papi;
948 struct Session *session;
950 papi = GST_plugins_find (address->transport_name);
953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
954 "Plugin %s not supported, cannot send PONG\n",
955 address->transport_name);
958 GNUNET_assert (NULL != papi->send);
959 GNUNET_assert (NULL != papi->get_session);
960 session = papi->get_session(papi->cls, address);
966 GST_ats_new_session (address, session);
967 papi->send (papi->cls, session,
969 ntohs (pong->header.size),
971 ACCEPTABLE_PING_DELAY,
973 GST_neighbours_notify_data_sent (address,
980 * We've received a PING. If appropriate, generate a PONG.
982 * @param sender peer sending the PING
983 * @param hdr the PING
984 * @param sender_address the sender address as we got it
985 * @param session session we got the PING from
986 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
989 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
990 const struct GNUNET_MessageHeader *hdr,
991 const struct GNUNET_HELLO_Address *sender_address,
992 struct Session *session)
994 const struct TransportPingMessage *ping;
995 struct TransportPongMessage *pong;
996 struct GNUNET_TRANSPORT_PluginFunctions *papi;
997 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
998 struct GNUNET_TIME_Absolute *sig_cache_exp;
1000 const char *addrend;
1006 struct GNUNET_HELLO_Address address;
1008 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1010 GNUNET_break_op (0);
1011 return GNUNET_SYSERR;
1013 ping = (const struct TransportPingMessage *) hdr;
1015 memcmp (&ping->target, &GST_my_identity,
1016 sizeof (struct GNUNET_PeerIdentity)))
1018 GNUNET_STATISTICS_update (GST_stats,
1020 ("# PING message for different peer received"), 1,
1022 return GNUNET_SYSERR;
1024 GNUNET_STATISTICS_update (GST_stats,
1025 gettext_noop ("# PING messages received"), 1,
1027 addr = (const char *) &ping[1];
1028 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1029 /* peer wants to confirm that this is one of our addresses, this is what is
1030 * used for address validation */
1033 sig_cache_exp = NULL;
1035 if (len_address > 0)
1037 addrend = memchr (addr, '\0', len_address);
1038 if (NULL == addrend)
1040 GNUNET_break_op (0);
1041 return GNUNET_SYSERR;
1044 len_plugin = strlen (addr) + 1;
1045 len_address -= len_plugin;
1046 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1047 address.address = addrend;
1048 address.address_length = len_address;
1049 address.transport_name = addr;
1050 address.peer = GST_my_identity;
1052 if (NULL == address.transport_name)
1057 if (0 != strstr (address.transport_name, "_client"))
1059 plugin_name = GNUNET_strdup (address.transport_name);
1060 pos = strstr (plugin_name, "_client");
1061 GNUNET_assert (NULL != pos);
1062 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1065 plugin_name = GNUNET_strdup (address.transport_name);
1067 if (NULL == (papi = GST_plugins_find (plugin_name)))
1069 /* we don't have the plugin for this address */
1070 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1071 _("Plugin `%s' not available, cannot confirm having this address\n"),
1073 GNUNET_free (plugin_name);
1074 return GNUNET_SYSERR;
1076 GNUNET_free (plugin_name);
1078 papi->check_address (papi->cls,
1082 GNUNET_STATISTICS_update (GST_stats,
1084 ("# failed address checks during validation"), 1,
1086 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1087 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1088 GST_plugins_a2s (&address));
1089 return GNUNET_SYSERR;
1093 GNUNET_STATISTICS_update (GST_stats,
1095 ("# successful address checks during validation"), 1,
1097 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1098 "Address `%s' is one of my addresses, confirming PING\n",
1099 GST_plugins_a2s (&address));
1103 GST_hello_test_address (&address,
1107 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1108 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1109 GNUNET_i2s (sender),
1110 GST_plugins_a2s (&address));
1111 return GNUNET_SYSERR;
1116 addrend = NULL; /* make gcc happy */
1118 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1119 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1121 sig_cache = &no_address_signature;
1122 sig_cache_exp = &no_address_signature_expiration;
1125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1126 "I am `%s', sending PONG to peer `%s'\n",
1127 GNUNET_i2s_full (&GST_my_identity),
1128 GNUNET_i2s (sender));
1130 /* message with structure:
1131 * [TransportPongMessage][Transport name][Address] */
1133 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1135 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1136 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1137 pong->purpose.size =
1138 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1139 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1140 len_address + len_plugin);
1141 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1142 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1143 pong->addrlen = htonl (len_address + len_plugin);
1144 memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1145 if (len_address > 0)
1147 GNUNET_assert (NULL != addrend);
1148 memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1150 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1151 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1153 /* create / update cached sig */
1154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1155 "Creating PONG signature to indicate ownership.\n");
1156 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1157 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1159 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1162 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1163 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1168 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1170 pong->signature = *sig_cache;
1172 GNUNET_assert (NULL != sender_address);
1174 /* first see if the session we got this PING from can be used to transmit
1175 * a response reliably */
1182 GNUNET_assert (NULL != papi->send);
1183 GNUNET_assert (NULL != papi->get_session);
1184 if (NULL == session)
1186 session = papi->get_session (papi->cls, sender_address);
1188 if (NULL == session)
1195 ret = papi->send (papi->cls, session,
1196 (const char *) pong,
1197 ntohs (pong->header.size),
1198 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1201 GST_neighbours_notify_data_sent (sender_address,
1208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1209 "Transmitted PONG to `%s' via reliable mechanism\n",
1210 GNUNET_i2s (sender));
1212 GNUNET_STATISTICS_update (GST_stats,
1214 ("# PONGs unicast via reliable transport"), 1,
1220 /* no reliable method found, try transmission via all known addresses */
1221 GNUNET_STATISTICS_update (GST_stats,
1223 ("# PONGs multicast to all available addresses"), 1,
1225 GST_validation_get_addresses (sender,
1226 &multicast_pong, pong);
1233 * Iterator callback to go over all addresses and try to validate them
1234 * (unless blocked or already validated).
1237 * @param address the address
1238 * @param expiration expiration time
1239 * @return #GNUNET_OK (keep the address)
1242 validate_address_iterator (void *cls,
1243 const struct GNUNET_HELLO_Address *address,
1244 struct GNUNET_TIME_Absolute expiration)
1246 struct GNUNET_TRANSPORT_PluginFunctions * papi;
1247 struct ValidationEntry *ve;
1249 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1251 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1252 "Skipping expired address from HELLO\n");
1253 return GNUNET_OK; /* expired */
1255 papi = GST_plugins_find (address->transport_name);
1258 /* This plugin is currently unvailable ... ignore */
1261 ve = find_validation_entry (address);
1262 if (NULL == ve->revalidation_task)
1264 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1265 "Validation process started for fresh address `%s'\n",
1266 GST_plugins_a2s (ve->address));
1267 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1274 * Add the validated peer address to the HELLO.
1276 * @param cls the `struct ValidationEntry *` with the validated address
1277 * @param max space in @a buf
1278 * @param buf where to add the address
1279 * @return number of bytes written, #GNUNET_SYSERR to signal the
1280 * end of the iteration.
1283 add_valid_peer_address (void *cls,
1287 struct ValidationEntry *ve = cls;
1289 if (GNUNET_YES == ve->copied)
1290 return GNUNET_SYSERR; /* Done */
1291 ve->copied = GNUNET_YES;
1292 return GNUNET_HELLO_add_address (ve->address,
1300 * We've received a PONG. Check if it matches a pending PING and
1301 * mark the respective address as confirmed.
1303 * @param sender peer sending the PONG
1304 * @param hdr the PONG
1305 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1308 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1309 const struct GNUNET_MessageHeader *hdr)
1311 const struct TransportPongMessage *pong;
1312 struct ValidationEntry *ve;
1318 struct GNUNET_HELLO_Message *hello;
1319 struct GNUNET_HELLO_Address address;
1323 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1325 GNUNET_break_op (0);
1326 return GNUNET_SYSERR;
1328 GNUNET_STATISTICS_update (GST_stats,
1329 gettext_noop ("# PONG messages received"), 1,
1332 /* message with structure:
1333 * [TransportPongMessage][Transport name][Address] */
1335 pong = (const struct TransportPongMessage *) hdr;
1336 tname = (const char *) &pong[1];
1337 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1338 addr = memchr (tname, '\0', size);
1341 GNUNET_break_op (0);
1342 return GNUNET_SYSERR;
1345 slen = strlen (tname) + 1;
1346 addrlen = size - slen;
1348 if (NULL == GST_plugins_find (tname))
1350 /* we got the PONG, but the transport plugin specified in it
1351 is not supported by this peer, so this cannot be a good
1353 GNUNET_break_op (0);
1357 address.peer = *sender;
1358 address.address = addr;
1359 address.address_length = addrlen;
1360 address.transport_name = tname;
1361 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1362 ve = find_validation_entry (&address);
1363 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1365 GNUNET_STATISTICS_update (GST_stats,
1367 ("# PONGs dropped, no matching pending validation"),
1371 /* now check that PONG is well-formed */
1372 if (0 != memcmp (&ve->address->peer,
1374 sizeof (struct GNUNET_PeerIdentity)))
1376 GNUNET_break_op (0);
1377 return GNUNET_SYSERR;
1380 GNUNET_TIME_absolute_get_remaining
1381 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1383 GNUNET_STATISTICS_update (GST_stats,
1385 ("# PONGs dropped, signature expired"), 1,
1387 return GNUNET_SYSERR;
1390 sig_res = GNUNET_SYSERR;
1391 do_verify = GNUNET_YES;
1392 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1394 /* We have a cached and valid signature for this peer,
1395 * try to compare instead of verify */
1396 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1398 /* signatures are identical, we can skip verification */
1399 sig_res = GNUNET_OK;
1400 do_verify = GNUNET_NO;
1404 sig_res = GNUNET_SYSERR;
1405 /* signatures do not match, we have to verify */
1409 if (GNUNET_YES == do_verify)
1411 /* Do expensive verification */
1412 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1413 &pong->purpose, &pong->signature,
1414 &ve->address->peer.public_key);
1415 if (sig_res == GNUNET_SYSERR)
1417 GNUNET_break_op (0);
1418 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1419 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1421 GST_plugins_a2s (ve->address),
1422 GNUNET_i2s (sender));
1425 if (sig_res == GNUNET_SYSERR)
1427 GNUNET_break_op (0);
1428 return GNUNET_SYSERR;
1431 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1432 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1433 GNUNET_i2s (sender),
1435 GST_plugins_a2s (ve->address));
1436 GNUNET_STATISTICS_update (GST_stats,
1437 gettext_noop ("# validations succeeded"),
1440 /* validity achieved, remember it! */
1441 ve->expecting_pong = GNUNET_NO;
1442 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1443 ve->pong_sig_cache = pong->signature;
1444 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1445 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1447 struct GNUNET_ATS_Information ats[2];
1449 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1450 ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
1451 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1452 ats[1].value = htonl ((uint32_t) ve->network);
1453 if (GNUNET_YES == ve->known_to_ats)
1455 GST_ats_update_metrics (ve->address, NULL, ats, 2);
1459 ve->known_to_ats = GNUNET_YES;
1460 GST_ats_add_address (ve->address, NULL, ats, 2);
1463 if (validations_running > 0)
1465 validations_running--;
1466 GNUNET_STATISTICS_set (GST_stats,
1467 gettext_noop ("# validations running"),
1468 validations_running,
1470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1471 "Validation finished, %u validation processes running\n",
1472 validations_running);
1479 /* Notify about new validity */
1480 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1482 /* build HELLO to store in PEERINFO */
1483 ve->copied = GNUNET_NO;
1484 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1485 &add_valid_peer_address, ve,
1487 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1488 GNUNET_free (hello);
1494 * We've received a HELLO, check which addresses are new and trigger
1497 * @param hello the HELLO we received
1498 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1501 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1503 const struct GNUNET_HELLO_Message *hm =
1504 (const struct GNUNET_HELLO_Message *) hello;
1505 struct GNUNET_PeerIdentity pid;
1506 struct GNUNET_HELLO_Message *h;
1509 friend = GNUNET_HELLO_is_friend_only (hm);
1510 if ( ( (GNUNET_YES != friend) &&
1511 (GNUNET_NO != friend) ) ||
1512 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1514 /* malformed HELLO */
1515 GNUNET_break_op (0);
1516 return GNUNET_SYSERR;
1519 memcmp (&GST_my_identity,
1521 sizeof (struct GNUNET_PeerIdentity)))
1523 /* Add peer identity without addresses to peerinfo service */
1524 h = GNUNET_HELLO_create (&pid.public_key, NULL, NULL, friend);
1525 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1526 _("Validation received new %s message for peer `%s' with size %u\n"),
1529 ntohs (hello->size));
1530 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1533 _("Adding `%s' without addresses for peer `%s'\n"), "HELLO",
1537 GNUNET_assert (NULL ==
1538 GNUNET_HELLO_iterate_addresses (hm,
1540 &validate_address_iterator,
1547 * Closure for #iterate_addresses().
1549 struct IteratorContext
1552 * Function to call on each address.
1554 GST_ValidationAddressCallback cb;
1557 * Closure for @e cb.
1565 * Call the callback in the closure for each validation entry.
1567 * @param cls the `struct IteratorContext`
1568 * @param key the peer's identity
1569 * @param value the `struct ValidationEntry`
1570 * @return #GNUNET_OK (continue to iterate)
1573 iterate_addresses (void *cls,
1574 const struct GNUNET_PeerIdentity *key,
1577 struct IteratorContext *ic = cls;
1578 struct ValidationEntry *ve = value;
1582 ve->revalidation_block,
1589 * Call the given function for each address for the given target.
1590 * Can either give a snapshot (synchronous API) or be continuous.
1592 * @param target peer information is requested for
1593 * @param cb function to call; will not be called after this function returns
1594 * @param cb_cls closure for @a cb
1597 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1598 GST_ValidationAddressCallback cb,
1601 struct IteratorContext ic;
1605 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1607 &iterate_addresses, &ic);
1612 * Update if we are using an address for a connection actively right now.
1613 * Based on this, the validation module will measure latency for the
1614 * address more or less often.
1616 * @param address the address that we are now using (or not)
1617 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1618 * #GNUNET_NO if we are no longer using the address for a connection
1621 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1624 struct ValidationEntry *ve;
1626 if (GNUNET_HELLO_address_check_option (address,
1627 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1628 return; /* ignore inbound for validation */
1629 if (NULL == GST_plugins_find (address->transport_name))
1631 /* How can we use an address for which we don't have the plugin? */
1635 ve = find_validation_entry (address);
1641 if (ve->in_use == in_use)
1643 if (GNUNET_YES == in_use)
1645 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1646 "Error setting address in use for peer `%s' `%s' to USED\n",
1647 GNUNET_i2s (&address->peer),
1648 GST_plugins_a2s (address));
1650 if (GNUNET_NO == in_use)
1652 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1653 "Error setting address in use for peer `%s' `%s' to NOT_USED\n",
1654 GNUNET_i2s (&address->peer),
1655 GST_plugins_a2s (address));
1659 GNUNET_break (ve->in_use != in_use); /* should be different... */
1660 ve->in_use = in_use;
1661 if (GNUNET_YES == in_use)
1663 /* from now on, higher frequeny, so reschedule now */
1664 if (NULL != ve->revalidation_task)
1665 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1666 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1672 * Closure for the validation_entries_iterate function.
1674 struct ValidationIteratorContext
1677 * Function to call on each validation entry
1679 GST_ValidationChangedCallback cb;
1682 * Closure for @e cb.
1689 * Function called on each entry in the validation map.
1690 * Passes the information from the validation entry to
1691 * the callback given in the closure.
1693 * @param cls the `struct ValidationIteratorContext`
1694 * @param key peer this is about
1695 * @param value the `struct ValidationEntry`
1696 * @return #GNUNET_OK (continue to iterate)
1699 validation_entries_iterate (void *cls,
1700 const struct GNUNET_PeerIdentity *key,
1703 struct ValidationIteratorContext *ic = cls;
1704 struct ValidationEntry *ve = value;
1706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1707 "Notifying about validation entry for peer `%s' address `%s' \n",
1708 GNUNET_i2s (&ve->address->peer),
1709 GST_plugins_a2s (ve->address));
1714 ve->next_validation,
1721 * Iterate over all iteration entries
1723 * @param cb function to call
1724 * @param cb_cls closure for @a cb
1727 GST_validation_iterate (GST_ValidationChangedCallback cb,
1730 struct ValidationIteratorContext ic;
1732 if (NULL == validation_map)
1733 return; /* can happen during shutdown */
1736 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1737 &validation_entries_iterate,
1741 /* end of file gnunet-service-transport_validation.c */