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3 Copyright (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,
417 GNUNET_TRANSPORT_VS_REMOVE);
421 GST_blacklist_test_cancel (ve->bc);
424 GNUNET_break (GNUNET_OK ==
425 GNUNET_CONTAINER_multipeermap_remove (validation_map,
428 publish_ve_stat_update ();
429 if (GNUNET_YES == ve->known_to_ats)
431 GST_ats_expire_address (ve->address);
432 ve->known_to_ats = GNUNET_NO;
434 GNUNET_HELLO_address_free (ve->address);
435 if (NULL != ve->timeout_task)
437 GNUNET_SCHEDULER_cancel (ve->timeout_task);
438 ve->timeout_task = NULL;
440 if (NULL != ve->revalidation_task)
442 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
443 ve->revalidation_task = NULL;
445 if ( (GNUNET_YES == ve->expecting_pong) &&
446 (validations_running > 0) )
448 validations_running--;
449 GNUNET_STATISTICS_set (GST_stats,
450 gettext_noop ("# validations running"),
460 * Address validation cleanup task. Assesses if the record is no
461 * longer valid and then possibly triggers its removal.
463 * @param cls the `struct ValidationEntry`
464 * @param tc scheduler context (unused)
467 timeout_hello_validation (void *cls,
468 const struct GNUNET_SCHEDULER_TaskContext *tc)
470 struct ValidationEntry *ve = cls;
471 struct GNUNET_TIME_Absolute max;
472 struct GNUNET_TIME_Relative left;
474 ve->timeout_task = NULL;
475 /* For valid addresses, we want to wait until the expire;
476 for addresses under PING validation, we want to wait
477 until we give up on the PING */
478 max = GNUNET_TIME_absolute_max (ve->valid_until,
479 ve->revalidation_block);
480 left = GNUNET_TIME_absolute_get_remaining (max);
481 if (left.rel_value_us > 0)
483 /* We should wait a bit longer. This happens when
484 address lifetimes are extended due to successful
487 GNUNET_SCHEDULER_add_delayed (left,
488 &timeout_hello_validation,
492 GNUNET_STATISTICS_update (GST_stats,
493 gettext_noop ("# address records discarded (timeout)"),
496 cleanup_validation_entry (NULL,
503 * Function called with the result from blacklisting.
504 * Send a PING to the other peer if a communication is allowed.
506 * @param cls our `struct ValidationEntry`
507 * @param pid identity of the other peer
508 * @param result #GNUNET_OK if the connection is allowed, #GNUNET_NO if not
511 transmit_ping_if_allowed (void *cls,
512 const struct GNUNET_PeerIdentity *pid,
515 struct ValidationEntry *ve = cls;
516 struct TransportPingMessage ping;
517 struct GNUNET_TRANSPORT_PluginFunctions *papi;
518 struct GNUNET_TIME_Absolute next;
519 const struct GNUNET_MessageHeader *hello;
520 enum GNUNET_ATS_Network_Type network;
527 if (GNUNET_NO == result)
529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
530 "Blacklist denies sending PING to `%s' `%s' `%s'\n",
532 GST_plugins_a2s (ve->address),
533 ve->address->transport_name);
534 GNUNET_STATISTICS_update (GST_stats,
535 gettext_noop ("# address records discarded (blacklist)"),
538 cleanup_validation_entry (NULL,
543 hello = GST_hello_get ();
544 GNUNET_assert (NULL != hello);
545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
546 "Transmitting plain PING to `%s' `%s' `%s'\n",
548 GST_plugins_a2s (ve->address),
549 ve->address->transport_name);
551 slen = strlen (ve->address->transport_name) + 1;
552 hsize = ntohs (hello->size);
554 sizeof (struct TransportPingMessage) + ve->address->address_length +
558 htons (sizeof (struct TransportPingMessage) +
559 ve->address->address_length + slen);
560 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
561 ping.challenge = htonl (ve->challenge);
564 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
569 sizeof (struct TransportPingMessage) + ve->address->address_length +
573 char message_buf[tsize];
575 /* build message with structure:
576 * [HELLO][TransportPingMessage][Transport name][Address] */
577 memcpy (message_buf, hello, hsize);
578 memcpy (&message_buf[hsize],
580 sizeof (struct TransportPingMessage));
581 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
582 ve->address->transport_name,
584 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
585 ve->address->address,
586 ve->address->address_length);
587 papi = GST_plugins_find (ve->address->transport_name);
588 GNUNET_assert (NULL != papi);
589 GNUNET_assert (NULL != papi->send);
590 struct Session *session = papi->get_session (papi->cls,
595 ret = papi->send (papi->cls, session,
598 ACCEPTABLE_PING_DELAY,
600 network = papi->get_network (papi->cls, session);
601 if (GNUNET_ATS_NET_UNSPECIFIED == network)
603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
604 "Could not obtain a valid network for `%s' `%s'\n",
606 GST_plugins_a2s (ve->address));
609 GST_neighbours_notify_data_sent (ve->address, session, tsize);
613 /* Could not get a valid session */
614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
615 "Could not get a valid session for `%s' `%s'\n",
617 GST_plugins_a2s (ve->address));
623 next = GNUNET_TIME_relative_to_absolute (validation_delay);
624 validation_next = GNUNET_TIME_absolute_max (next,
626 ve->send_time = GNUNET_TIME_absolute_get ();
627 GNUNET_STATISTICS_update (GST_stats,
628 gettext_noop ("# PINGs for address validation sent"),
631 ve->network = network;
632 ve->expecting_pong = GNUNET_YES;
633 validations_running++;
634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
635 "Validation started, %u validation processes running\n",
636 validations_running);
637 GNUNET_STATISTICS_set (GST_stats,
638 gettext_noop ("# validations running"),
641 /* Notify about PING sent */
642 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
648 * Do address validation again to keep address valid.
650 * @param cls the `struct ValidationEntry`
651 * @param tc scheduler context (unused)
654 revalidate_address (void *cls,
655 const struct GNUNET_SCHEDULER_TaskContext *tc)
657 struct ValidationEntry *ve = cls;
658 struct GNUNET_TIME_Relative canonical_delay;
659 struct GNUNET_TIME_Relative delay;
660 struct GNUNET_TIME_Relative blocked_for;
661 struct GST_BlacklistCheck *bc;
664 ve->revalidation_task = NULL;
665 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
666 /* Considering current connectivity situation, what is the maximum
667 block period permitted? */
668 if (GNUNET_YES == ve->in_use)
669 canonical_delay = CONNECTED_PING_FREQUENCY;
670 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
671 canonical_delay = VALIDATED_PING_FREQUENCY;
673 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
674 /* Use delay that is MIN of original delay and possibly adjusted
675 new maximum delay (which may be lower); the real delay
676 is originally randomized between "canonical_delay" and "2 * canonical_delay",
677 so continue to permit that window for the operation. */
678 delay = GNUNET_TIME_relative_min (delay,
679 GNUNET_TIME_relative_multiply (canonical_delay,
681 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
682 if (delay.rel_value_us > 0)
684 /* should wait a bit longer */
685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
686 "Waiting for %s longer before validating address `%s'\n",
687 GNUNET_STRINGS_relative_time_to_string (delay,
689 GST_plugins_a2s (ve->address));
690 ve->revalidation_task =
691 GNUNET_SCHEDULER_add_delayed (delay,
692 &revalidate_address, ve);
693 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
696 /* check if globally we have too many active validations at a
697 too high rate, if so, delay ours */
698 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
699 if ( (validations_running > validations_fast_start_threshold) &&
700 (blocked_for.rel_value_us > 0) )
702 /* Validations are blocked, have to wait for blocked_for time */
703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
704 "Validations blocked for another %s, delaying validating address `%s'\n",
705 GNUNET_STRINGS_relative_time_to_string (blocked_for,
707 GST_plugins_a2s (ve->address));
708 GNUNET_STATISTICS_update (GST_stats,
709 gettext_noop ("# validations delayed by global throttle"),
712 ve->revalidation_task =
713 GNUNET_SCHEDULER_add_delayed (blocked_for,
716 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
720 /* We are good to go; remember to not go again for `canonical_delay` time;
721 add up to `canonical_delay` to randomize start time */
722 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
723 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
725 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
726 canonical_delay.rel_value_us);
728 delay = GNUNET_TIME_relative_add (canonical_delay,
729 GNUNET_TIME_relative_multiply
730 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
733 "Validating now, next scheduled for %s, now validating address `%s'\n",
734 GNUNET_STRINGS_relative_time_to_string (blocked_for,
736 GST_plugins_a2s (ve->address));
737 ve->revalidation_task =
738 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
739 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
741 /* start PINGing by checking blacklist */
742 GNUNET_STATISTICS_update (GST_stats,
743 gettext_noop ("# address revalidations started"), 1,
745 bc = GST_blacklist_test_allowed (&ve->address->peer,
746 ve->address->transport_name,
747 &transmit_ping_if_allowed, ve);
749 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
755 * Find a ValidationEntry entry for the given neighbour that matches
756 * the given address and transport. If none exists, create one (but
757 * without starting any validation).
759 * @param address address to find
760 * @return validation entry matching the given specifications, NULL
761 * if we don't have an existing entry and no public key was given
763 static struct ValidationEntry *
764 find_validation_entry (const struct GNUNET_HELLO_Address *address)
766 struct ValidationEntryMatchContext vemc;
767 struct ValidationEntry *ve;
770 vemc.address = address;
771 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
773 &validation_entry_match, &vemc);
774 if (NULL != (ve = vemc.ve))
776 ve = GNUNET_new (struct ValidationEntry);
777 ve->in_use = GNUNET_SYSERR; /* not defined */
778 ve->address = GNUNET_HELLO_address_copy (address);
779 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
780 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
781 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
783 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
785 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
786 &timeout_hello_validation,
788 GNUNET_CONTAINER_multipeermap_put (validation_map,
791 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
792 publish_ve_stat_update ();
793 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
799 * Iterator which adds the given address to the set of validated
802 * @param cls original HELLO message
803 * @param address the address
804 * @param expiration expiration time
805 * @return #GNUNET_OK (keep the address), could return
806 * #GNUNET_NO (delete address, but this is ignored);
807 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
810 add_valid_address (void *cls,
811 const struct GNUNET_HELLO_Address *address,
812 struct GNUNET_TIME_Absolute expiration)
814 const struct GNUNET_HELLO_Message *hello = cls;
815 struct ValidationEntry *ve;
816 struct GNUNET_PeerIdentity pid;
817 struct GNUNET_ATS_Properties prop;
819 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
820 return GNUNET_OK; /* expired */
821 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
824 return GNUNET_OK; /* invalid HELLO !? */
826 if (NULL == GST_plugins_find (address->transport_name))
828 /* might have been valid in the past, but we don't have that
829 plugin loaded right now */
833 ve = find_validation_entry (address);
834 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
836 if (NULL == ve->revalidation_task)
838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
839 "Starting revalidations for valid address `%s'\n",
840 GST_plugins_a2s (ve->address));
841 ve->next_validation = GNUNET_TIME_absolute_get();
842 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
844 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
845 memset (&prop, 0, sizeof (prop));
846 prop.scope = ve->network;
847 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
848 if (GNUNET_YES != ve->known_to_ats)
850 ve->known_to_ats = GNUNET_YES;
851 GST_ats_add_address (address, &prop);
858 * Function called for any HELLO known to PEERINFO.
860 * @param cls unused (NULL)
861 * @param peer id of the peer, NULL for last call (during iteration,
862 * as we are monitoring, this should never happen)
863 * @param hello hello message for the peer (can be NULL)
864 * @param err_msg error message
867 process_peerinfo_hello (void *cls,
868 const struct GNUNET_PeerIdentity *peer,
869 const struct GNUNET_HELLO_Message *hello,
872 GNUNET_assert (NULL != peer);
875 if (0 == memcmp (&GST_my_identity,
877 sizeof (struct GNUNET_PeerIdentity)))
879 /* Peerinfo returned own identity, skip validation */
882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
883 "Handling HELLO for peer `%s'\n",
885 GNUNET_assert (NULL ==
886 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
893 * Start the validation subsystem.
895 * @param max_fds maximum number of fds to use
898 GST_validation_start (unsigned int max_fds)
901 * Initialization for validation throttling
903 * We have a maximum number max_fds of connections we can use for validation
904 * We monitor the number of validations in parallel and start to throttle it
905 * when doing to many validations in parallel:
906 * if (running validations < (max_fds / 2))
907 * - "fast start": run validation immediately
908 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
909 * (300 sec / ~150 == ~2 sec.) between two validations
912 validation_next = GNUNET_TIME_absolute_get();
913 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
914 validations_fast_start_threshold = (max_fds / 2);
915 validations_running = 0;
916 GNUNET_STATISTICS_set (GST_stats,
917 gettext_noop ("# validations running"),
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
921 "Validation uses a fast start threshold of %u connections and a delay of %s\n",
922 validations_fast_start_threshold,
923 GNUNET_STRINGS_relative_time_to_string (validation_delay,
925 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
927 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
928 &process_peerinfo_hello, NULL);
933 * Stop the validation subsystem.
936 GST_validation_stop ()
938 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
939 &cleanup_validation_entry,
941 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
942 validation_map = NULL;
943 GNUNET_PEERINFO_notify_cancel (pnc);
948 * Send the given PONG to the given address.
950 * @param cls the PONG message
951 * @param valid_until is ZERO if we never validated the address,
952 * otherwise a time up to when we consider it (or was) valid
953 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
954 * is ZERO if the address is considered valid (no validation needed)
955 * otherwise a time in the future if we're currently denying re-validation
956 * @param address target address
959 multicast_pong (void *cls,
960 struct GNUNET_TIME_Absolute valid_until,
961 struct GNUNET_TIME_Absolute validation_block,
962 const struct GNUNET_HELLO_Address *address)
964 struct TransportPongMessage *pong = cls;
965 struct GNUNET_TRANSPORT_PluginFunctions *papi;
966 struct Session *session;
968 papi = GST_plugins_find (address->transport_name);
971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
972 "Plugin %s not supported, cannot send PONG\n",
973 address->transport_name);
976 GNUNET_assert (NULL != papi->send);
977 GNUNET_assert (NULL != papi->get_session);
978 session = papi->get_session(papi->cls, address);
984 GST_ats_new_session (address, session);
985 papi->send (papi->cls, session,
987 ntohs (pong->header.size),
989 ACCEPTABLE_PING_DELAY,
991 GST_neighbours_notify_data_sent (address,
998 * We've received a PING. If appropriate, generate a PONG.
1000 * @param sender peer sending the PING
1001 * @param hdr the PING
1002 * @param sender_address the sender address as we got it
1003 * @param session session we got the PING from
1004 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1007 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
1008 const struct GNUNET_MessageHeader *hdr,
1009 const struct GNUNET_HELLO_Address *sender_address,
1010 struct Session *session)
1012 const struct TransportPingMessage *ping;
1013 struct TransportPongMessage *pong;
1014 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1015 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
1016 struct GNUNET_TIME_Absolute *sig_cache_exp;
1018 const char *addrend;
1024 struct GNUNET_HELLO_Address address;
1026 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1028 GNUNET_break_op (0);
1029 return GNUNET_SYSERR;
1031 ping = (const struct TransportPingMessage *) hdr;
1033 memcmp (&ping->target, &GST_my_identity,
1034 sizeof (struct GNUNET_PeerIdentity)))
1036 GNUNET_STATISTICS_update (GST_stats,
1038 ("# PING message for different peer received"), 1,
1040 return GNUNET_SYSERR;
1042 GNUNET_STATISTICS_update (GST_stats,
1043 gettext_noop ("# PING messages received"), 1,
1045 addr = (const char *) &ping[1];
1046 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1047 /* peer wants to confirm that this is one of our addresses, this is what is
1048 * used for address validation */
1051 sig_cache_exp = NULL;
1053 if (len_address > 0)
1055 addrend = memchr (addr, '\0', len_address);
1056 if (NULL == addrend)
1058 GNUNET_break_op (0);
1059 return GNUNET_SYSERR;
1062 len_plugin = strlen (addr) + 1;
1063 len_address -= len_plugin;
1064 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1065 address.address = addrend;
1066 address.address_length = len_address;
1067 address.transport_name = addr;
1068 address.peer = GST_my_identity;
1070 if (NULL == address.transport_name)
1075 if (0 != strstr (address.transport_name, "_client"))
1077 plugin_name = GNUNET_strdup (address.transport_name);
1078 pos = strstr (plugin_name, "_client");
1079 GNUNET_assert (NULL != pos);
1080 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1083 plugin_name = GNUNET_strdup (address.transport_name);
1085 if (NULL == (papi = GST_plugins_find (plugin_name)))
1087 /* we don't have the plugin for this address */
1088 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1089 _("Plugin `%s' not available, cannot confirm having this address\n"),
1091 GNUNET_free (plugin_name);
1092 return GNUNET_SYSERR;
1094 GNUNET_free (plugin_name);
1096 papi->check_address (papi->cls,
1100 GNUNET_STATISTICS_update (GST_stats,
1102 ("# failed address checks during validation"), 1,
1104 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1105 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1106 GST_plugins_a2s (&address));
1107 return GNUNET_SYSERR;
1111 GNUNET_STATISTICS_update (GST_stats,
1113 ("# successful address checks during validation"), 1,
1115 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1116 "Address `%s' is one of my addresses, confirming PING\n",
1117 GST_plugins_a2s (&address));
1121 GST_hello_test_address (&address,
1125 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1126 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1127 GNUNET_i2s (sender),
1128 GST_plugins_a2s (&address));
1129 return GNUNET_SYSERR;
1134 addrend = NULL; /* make gcc happy */
1136 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1137 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1139 sig_cache = &no_address_signature;
1140 sig_cache_exp = &no_address_signature_expiration;
1143 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1144 "I am `%s', sending PONG to peer `%s'\n",
1145 GNUNET_i2s_full (&GST_my_identity),
1146 GNUNET_i2s (sender));
1148 /* message with structure:
1149 * [TransportPongMessage][Transport name][Address] */
1151 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1153 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1154 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1155 pong->purpose.size =
1156 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1157 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1158 len_address + len_plugin);
1159 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1160 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1161 pong->addrlen = htonl (len_address + len_plugin);
1162 memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1163 if (len_address > 0)
1165 GNUNET_assert (NULL != addrend);
1166 memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1168 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1169 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1171 /* create / update cached sig */
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Creating PONG signature to indicate ownership.\n");
1174 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1175 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1177 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1180 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1181 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1186 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1188 pong->signature = *sig_cache;
1190 GNUNET_assert (NULL != sender_address);
1192 /* first see if the session we got this PING from can be used to transmit
1193 * a response reliably */
1200 GNUNET_assert (NULL != papi->send);
1201 GNUNET_assert (NULL != papi->get_session);
1202 if (NULL == session)
1204 session = papi->get_session (papi->cls, sender_address);
1206 if (NULL == session)
1213 ret = papi->send (papi->cls, session,
1214 (const char *) pong,
1215 ntohs (pong->header.size),
1216 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1219 GST_neighbours_notify_data_sent (sender_address,
1226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1227 "Transmitted PONG to `%s' via reliable mechanism\n",
1228 GNUNET_i2s (sender));
1230 GNUNET_STATISTICS_update (GST_stats,
1232 ("# PONGs unicast via reliable transport"), 1,
1238 /* no reliable method found, try transmission via all known addresses */
1239 GNUNET_STATISTICS_update (GST_stats,
1241 ("# PONGs multicast to all available addresses"), 1,
1243 GST_validation_get_addresses (sender,
1244 &multicast_pong, pong);
1251 * Validate an individual address.
1253 * @param address address we should try to validate
1256 GST_validation_handle_address (const struct GNUNET_HELLO_Address *address)
1258 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1259 struct ValidationEntry *ve;
1261 papi = GST_plugins_find (address->transport_name);
1264 /* This plugin is currently unvailable ... ignore */
1267 ve = find_validation_entry (address);
1268 if (NULL == ve->revalidation_task)
1270 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1271 "Validation process started for fresh address `%s' of %s\n",
1272 GST_plugins_a2s (ve->address),
1273 GNUNET_i2s (&ve->address->peer));
1274 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1280 * Iterator callback to go over all addresses and try to validate them
1281 * (unless blocked or already validated).
1284 * @param address the address
1285 * @param expiration expiration time
1286 * @return #GNUNET_OK (keep the address)
1289 validate_address_iterator (void *cls,
1290 const struct GNUNET_HELLO_Address *address,
1291 struct GNUNET_TIME_Absolute expiration)
1293 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1296 "Skipping expired address from HELLO\n");
1297 return GNUNET_OK; /* expired */
1299 GST_validation_handle_address (address);
1305 * Add the validated peer address to the HELLO.
1307 * @param cls the `struct ValidationEntry *` with the validated address
1308 * @param max space in @a buf
1309 * @param buf where to add the address
1310 * @return number of bytes written, #GNUNET_SYSERR to signal the
1311 * end of the iteration.
1314 add_valid_peer_address (void *cls,
1318 struct ValidationEntry *ve = cls;
1320 if (GNUNET_YES == ve->copied)
1321 return GNUNET_SYSERR; /* Done */
1322 ve->copied = GNUNET_YES;
1323 return GNUNET_HELLO_add_address (ve->address,
1331 * We've received a PONG. Check if it matches a pending PING and
1332 * mark the respective address as confirmed.
1334 * @param sender peer sending the PONG
1335 * @param hdr the PONG
1336 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1339 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1340 const struct GNUNET_MessageHeader *hdr)
1342 const struct TransportPongMessage *pong;
1343 struct ValidationEntry *ve;
1349 struct GNUNET_HELLO_Message *hello;
1350 struct GNUNET_HELLO_Address address;
1354 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1356 GNUNET_break_op (0);
1357 return GNUNET_SYSERR;
1359 GNUNET_STATISTICS_update (GST_stats,
1360 gettext_noop ("# PONG messages received"), 1,
1363 /* message with structure:
1364 * [TransportPongMessage][Transport name][Address] */
1366 pong = (const struct TransportPongMessage *) hdr;
1367 tname = (const char *) &pong[1];
1368 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1369 addr = memchr (tname, '\0', size);
1372 GNUNET_break_op (0);
1373 return GNUNET_SYSERR;
1376 slen = strlen (tname) + 1;
1377 addrlen = size - slen;
1379 if (NULL == GST_plugins_find (tname))
1381 /* we got the PONG, but the transport plugin specified in it
1382 is not supported by this peer, so this cannot be a good
1384 GNUNET_break_op (0);
1388 address.peer = *sender;
1389 address.address = addr;
1390 address.address_length = addrlen;
1391 address.transport_name = tname;
1392 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1393 ve = find_validation_entry (&address);
1394 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1396 GNUNET_STATISTICS_update (GST_stats,
1398 ("# PONGs dropped, no matching pending validation"),
1402 /* now check that PONG is well-formed */
1403 if (0 != memcmp (&ve->address->peer,
1405 sizeof (struct GNUNET_PeerIdentity)))
1407 GNUNET_break_op (0);
1408 return GNUNET_SYSERR;
1411 GNUNET_TIME_absolute_get_remaining
1412 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1414 GNUNET_STATISTICS_update (GST_stats,
1416 ("# PONGs dropped, signature expired"), 1,
1418 return GNUNET_SYSERR;
1421 sig_res = GNUNET_SYSERR;
1422 do_verify = GNUNET_YES;
1423 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1425 /* We have a cached and valid signature for this peer,
1426 * try to compare instead of verify */
1427 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1429 /* signatures are identical, we can skip verification */
1430 sig_res = GNUNET_OK;
1431 do_verify = GNUNET_NO;
1435 sig_res = GNUNET_SYSERR;
1436 /* signatures do not match, we have to verify */
1440 if (GNUNET_YES == do_verify)
1442 /* Do expensive verification */
1443 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1444 &pong->purpose, &pong->signature,
1445 &ve->address->peer.public_key);
1446 if (sig_res == GNUNET_SYSERR)
1448 GNUNET_break_op (0);
1449 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1450 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1452 GST_plugins_a2s (ve->address),
1453 GNUNET_i2s (sender));
1456 if (sig_res == GNUNET_SYSERR)
1458 GNUNET_break_op (0);
1459 return GNUNET_SYSERR;
1462 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1463 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1464 GNUNET_i2s (sender),
1466 GST_plugins_a2s (ve->address));
1467 GNUNET_STATISTICS_update (GST_stats,
1468 gettext_noop ("# validations succeeded"),
1471 /* validity achieved, remember it! */
1472 ve->expecting_pong = GNUNET_NO;
1473 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1474 ve->pong_sig_cache = pong->signature;
1475 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1476 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1478 if (GNUNET_YES == ve->known_to_ats)
1480 GST_ats_update_delay (ve->address,
1481 GNUNET_TIME_relative_divide (ve->latency, 2));
1485 struct GNUNET_ATS_Properties prop;
1487 memset (&prop, 0, sizeof (prop));
1488 prop.scope = ve->network;
1489 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
1490 ve->known_to_ats = GNUNET_YES;
1491 GST_ats_add_address (ve->address, &prop);
1494 if (validations_running > 0)
1496 validations_running--;
1497 GNUNET_STATISTICS_set (GST_stats,
1498 gettext_noop ("# validations running"),
1499 validations_running,
1501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1502 "Validation finished, %u validation processes running\n",
1503 validations_running);
1510 /* Notify about new validity */
1511 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1513 /* build HELLO to store in PEERINFO */
1514 ve->copied = GNUNET_NO;
1515 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1516 &add_valid_peer_address, ve,
1518 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1519 GNUNET_free (hello);
1525 * We've received a HELLO, check which addresses are new and trigger
1528 * @param hello the HELLO we received
1529 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1532 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1534 const struct GNUNET_HELLO_Message *hm =
1535 (const struct GNUNET_HELLO_Message *) hello;
1536 struct GNUNET_PeerIdentity pid;
1537 struct GNUNET_HELLO_Message *h;
1540 friend = GNUNET_HELLO_is_friend_only (hm);
1541 if ( ( (GNUNET_YES != friend) &&
1542 (GNUNET_NO != friend) ) ||
1543 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1545 /* malformed HELLO */
1546 GNUNET_break_op (0);
1547 return GNUNET_SYSERR;
1550 memcmp (&GST_my_identity,
1552 sizeof (struct GNUNET_PeerIdentity)))
1554 /* got our own HELLO, how boring */
1558 GNUNET_CONTAINER_multipeermap_contains (validation_map,
1561 /* Add peer identity without addresses to peerinfo service */
1562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1563 "Adding HELLO without addresses for peer `%s'\n",
1565 h = GNUNET_HELLO_create (&pid.public_key, NULL, NULL, friend);
1566 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1573 "Validation received HELLO message for peer `%s' with size %u, checking for new addresses\n",
1575 ntohs (hello->size));
1577 GNUNET_assert (NULL ==
1578 GNUNET_HELLO_iterate_addresses (hm,
1580 &validate_address_iterator,
1587 * Closure for #iterate_addresses().
1589 struct IteratorContext
1592 * Function to call on each address.
1594 GST_ValidationAddressCallback cb;
1597 * Closure for @e cb.
1605 * Call the callback in the closure for each validation entry.
1607 * @param cls the `struct IteratorContext`
1608 * @param key the peer's identity
1609 * @param value the `struct ValidationEntry`
1610 * @return #GNUNET_OK (continue to iterate)
1613 iterate_addresses (void *cls,
1614 const struct GNUNET_PeerIdentity *key,
1617 struct IteratorContext *ic = cls;
1618 struct ValidationEntry *ve = value;
1622 ve->revalidation_block,
1629 * Call the given function for each address for the given target.
1630 * Can either give a snapshot (synchronous API) or be continuous.
1632 * @param target peer information is requested for
1633 * @param cb function to call; will not be called after this function returns
1634 * @param cb_cls closure for @a cb
1637 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1638 GST_ValidationAddressCallback cb,
1641 struct IteratorContext ic;
1645 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1647 &iterate_addresses, &ic);
1652 * Update if we are using an address for a connection actively right now.
1653 * Based on this, the validation module will measure latency for the
1654 * address more or less often.
1656 * @param address the address that we are now using (or not)
1657 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1658 * #GNUNET_NO if we are no longer using the address for a connection
1661 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1664 struct ValidationEntry *ve;
1666 if (GNUNET_HELLO_address_check_option (address,
1667 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1668 return; /* ignore inbound for validation */
1669 if (NULL == GST_plugins_find (address->transport_name))
1671 /* How can we use an address for which we don't have the plugin? */
1675 ve = find_validation_entry (address);
1681 if (in_use == ve->in_use)
1683 ve->in_use = in_use;
1684 if (GNUNET_YES == in_use)
1686 /* from now on, higher frequeny, so reschedule now */
1687 if (NULL != ve->revalidation_task)
1688 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1689 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address,
1696 * Closure for the validation_entries_iterate function.
1698 struct ValidationIteratorContext
1701 * Function to call on each validation entry
1703 GST_ValidationChangedCallback cb;
1706 * Closure for @e cb.
1713 * Function called on each entry in the validation map.
1714 * Passes the information from the validation entry to
1715 * the callback given in the closure.
1717 * @param cls the `struct ValidationIteratorContext`
1718 * @param key peer this is about
1719 * @param value the `struct ValidationEntry`
1720 * @return #GNUNET_OK (continue to iterate)
1723 validation_entries_iterate (void *cls,
1724 const struct GNUNET_PeerIdentity *key,
1727 struct ValidationIteratorContext *ic = cls;
1728 struct ValidationEntry *ve = value;
1730 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1731 "Notifying about validation entry for peer `%s' address `%s' \n",
1732 GNUNET_i2s (&ve->address->peer),
1733 GST_plugins_a2s (ve->address));
1738 ve->next_validation,
1745 * Iterate over all iteration entries
1747 * @param cb function to call
1748 * @param cb_cls closure for @a cb
1751 GST_validation_iterate (GST_ValidationChangedCallback cb,
1754 struct ValidationIteratorContext ic;
1756 if (NULL == validation_map)
1757 return; /* can happen during shutdown */
1760 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1761 &validation_entries_iterate,
1765 /* end of file gnunet-service-transport_validation.c */