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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, 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 aborted, %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);
529 hello = GST_hello_get ();
532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
533 "Not PINGing peer `%s' as our HELLO is not yet ready\n",
537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
538 "Transmitting plain PING to `%s' `%s' `%s'\n",
540 GST_plugins_a2s (ve->address),
541 ve->address->transport_name);
543 slen = strlen (ve->address->transport_name) + 1;
544 hsize = ntohs (hello->size);
546 sizeof (struct TransportPingMessage) + ve->address->address_length +
550 htons (sizeof (struct TransportPingMessage) +
551 ve->address->address_length + slen);
552 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
553 ping.challenge = htonl (ve->challenge);
556 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
561 sizeof (struct TransportPingMessage) + ve->address->address_length +
565 char message_buf[tsize];
567 /* build message with structure:
568 * [HELLO][TransportPingMessage][Transport name][Address] */
569 memcpy (message_buf, hello, hsize);
570 memcpy (&message_buf[hsize],
572 sizeof (struct TransportPingMessage));
573 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
574 ve->address->transport_name,
576 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
577 ve->address->address,
578 ve->address->address_length);
579 papi = GST_plugins_find (ve->address->transport_name);
580 GNUNET_assert (NULL != papi);
581 GNUNET_assert (NULL != papi->send);
582 struct Session *session = papi->get_session (papi->cls,
587 ret = papi->send (papi->cls, session,
590 ACCEPTABLE_PING_DELAY,
592 network = papi->get_network (papi->cls, session);
593 if (GNUNET_ATS_NET_UNSPECIFIED == network)
595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
596 "Could not obtain a valid network for `%s' `%s'\n",
598 GST_plugins_a2s (ve->address));
601 GST_neighbours_notify_data_sent (ve->address, session, tsize);
605 /* Could not get a valid session */
606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
607 "Could not get a valid session for `%s' `%s'\n",
609 GST_plugins_a2s (ve->address));
615 next = GNUNET_TIME_relative_to_absolute (validation_delay);
616 validation_next = GNUNET_TIME_absolute_max (next,
618 ve->send_time = GNUNET_TIME_absolute_get ();
619 GNUNET_STATISTICS_update (GST_stats,
620 gettext_noop ("# PINGs for address validation sent"),
623 ve->network = network;
624 ve->expecting_pong = GNUNET_YES;
625 validations_running++;
626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
627 "Validation started, %u validation processes running\n",
628 validations_running);
629 GNUNET_STATISTICS_set (GST_stats,
630 gettext_noop ("# validations running"),
633 /* Notify about PING sent */
634 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
640 * Do address validation again to keep address valid.
642 * @param cls the `struct ValidationEntry`
643 * @param tc scheduler context (unused)
646 revalidate_address (void *cls,
647 const struct GNUNET_SCHEDULER_TaskContext *tc)
649 struct ValidationEntry *ve = cls;
650 struct GNUNET_TIME_Relative canonical_delay;
651 struct GNUNET_TIME_Relative delay;
652 struct GNUNET_TIME_Relative blocked_for;
653 struct GST_BlacklistCheck *bc;
656 ve->revalidation_task = NULL;
657 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
658 /* Considering current connectivity situation, what is the maximum
659 block period permitted? */
660 if (GNUNET_YES == ve->in_use)
661 canonical_delay = CONNECTED_PING_FREQUENCY;
662 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
663 canonical_delay = VALIDATED_PING_FREQUENCY;
665 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
666 /* Use delay that is MIN of original delay and possibly adjusted
667 new maximum delay (which may be lower); the real delay
668 is originally randomized between "canonical_delay" and "2 * canonical_delay",
669 so continue to permit that window for the operation. */
670 delay = GNUNET_TIME_relative_min (delay,
671 GNUNET_TIME_relative_multiply (canonical_delay,
673 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
674 if (delay.rel_value_us > 0)
676 /* should wait a bit longer */
677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
678 "Waiting for %s longer before validating address `%s'\n",
679 GNUNET_STRINGS_relative_time_to_string (delay,
681 GST_plugins_a2s (ve->address));
682 ve->revalidation_task =
683 GNUNET_SCHEDULER_add_delayed (delay,
684 &revalidate_address, ve);
685 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
688 /* check if globally we have too many active validations at a
689 too high rate, if so, delay ours */
690 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
691 if ( (validations_running > validations_fast_start_threshold) &&
692 (blocked_for.rel_value_us > 0) )
694 /* Validations are blocked, have to wait for blocked_for time */
695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
696 "Validations blocked for another %s, delaying validating address `%s'\n",
697 GNUNET_STRINGS_relative_time_to_string (blocked_for,
699 GST_plugins_a2s (ve->address));
700 GNUNET_STATISTICS_update (GST_stats,
701 gettext_noop ("# validations delayed by global throttle"),
704 ve->revalidation_task =
705 GNUNET_SCHEDULER_add_delayed (blocked_for,
708 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
712 /* We are good to go; remember to not go again for `canonical_delay` time;
713 add up to `canonical_delay` to randomize start time */
714 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
715 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
717 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
718 canonical_delay.rel_value_us);
720 delay = GNUNET_TIME_relative_add (canonical_delay,
721 GNUNET_TIME_relative_multiply
722 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
725 "Validating now, next scheduled for %s, now validating address `%s'\n",
726 GNUNET_STRINGS_relative_time_to_string (blocked_for,
728 GST_plugins_a2s (ve->address));
729 ve->revalidation_task =
730 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
731 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
733 /* start PINGing by checking blacklist */
734 GNUNET_STATISTICS_update (GST_stats,
735 gettext_noop ("# address revalidations started"), 1,
737 bc = GST_blacklist_test_allowed (&ve->address->peer,
738 ve->address->transport_name,
739 &transmit_ping_if_allowed, ve);
741 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
747 * Find a ValidationEntry entry for the given neighbour that matches
748 * the given address and transport. If none exists, create one (but
749 * without starting any validation).
751 * @param address address to find
752 * @return validation entry matching the given specifications, NULL
753 * if we don't have an existing entry and no public key was given
755 static struct ValidationEntry *
756 find_validation_entry (const struct GNUNET_HELLO_Address *address)
758 struct ValidationEntryMatchContext vemc;
759 struct ValidationEntry *ve;
762 vemc.address = address;
763 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
765 &validation_entry_match, &vemc);
766 if (NULL != (ve = vemc.ve))
768 ve = GNUNET_new (struct ValidationEntry);
769 ve->in_use = GNUNET_SYSERR; /* not defined */
770 ve->address = GNUNET_HELLO_address_copy (address);
771 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
772 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
773 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
775 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
777 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
778 &timeout_hello_validation, ve);
779 GNUNET_CONTAINER_multipeermap_put (validation_map, &address->peer,
781 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
782 publish_ve_stat_update ();
783 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
789 * Iterator which adds the given address to the set of validated
792 * @param cls original HELLO message
793 * @param address the address
794 * @param expiration expiration time
795 * @return #GNUNET_OK (keep the address), could return
796 * #GNUNET_NO (delete address, but this is ignored);
797 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
800 add_valid_address (void *cls,
801 const struct GNUNET_HELLO_Address *address,
802 struct GNUNET_TIME_Absolute expiration)
804 const struct GNUNET_HELLO_Message *hello = cls;
805 struct ValidationEntry *ve;
806 struct GNUNET_PeerIdentity pid;
807 struct GNUNET_ATS_Information ats;
809 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
810 return GNUNET_OK; /* expired */
811 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
814 return GNUNET_OK; /* invalid HELLO !? */
816 if (NULL == GST_plugins_find (address->transport_name))
818 /* might have been valid in the past, but we don't have that
819 plugin loaded right now */
823 ve = find_validation_entry (address);
824 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
826 if (NULL == ve->revalidation_task)
828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
829 "Starting revalidations for valid address `%s'\n",
830 GST_plugins_a2s (ve->address));
831 ve->next_validation = GNUNET_TIME_absolute_get();
832 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
834 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
836 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
837 ats.value = htonl (ve->network);
838 if (GNUNET_YES != ve->known_to_ats)
840 ve->known_to_ats = GNUNET_YES;
841 GST_ats_add_address (address, &ats, 1);
848 * Function called for any HELLO known to PEERINFO.
850 * @param cls unused (NULL)
851 * @param peer id of the peer, NULL for last call (during iteration,
852 * as we are monitoring, this should never happen)
853 * @param hello hello message for the peer (can be NULL)
854 * @param err_msg error message
857 process_peerinfo_hello (void *cls,
858 const struct GNUNET_PeerIdentity *peer,
859 const struct GNUNET_HELLO_Message *hello,
862 GNUNET_assert (NULL != peer);
865 if (0 == memcmp (&GST_my_identity,
867 sizeof (struct GNUNET_PeerIdentity)))
869 /* Peerinfo returned own identity, skip validation */
872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
873 "Handling HELLO for peer `%s'\n",
875 GNUNET_assert (NULL ==
876 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
883 * Start the validation subsystem.
885 * @param max_fds maximum number of fds to use
888 GST_validation_start (unsigned int max_fds)
891 * Initialization for validation throttling
893 * We have a maximum number max_fds of connections we can use for validation
894 * We monitor the number of validations in parallel and start to throttle it
895 * when doing to many validations in parallel:
896 * if (running validations < (max_fds / 2))
897 * - "fast start": run validation immediately
898 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
899 * (300 sec / ~150 == ~2 sec.) between two validations
902 validation_next = GNUNET_TIME_absolute_get();
903 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
904 validations_fast_start_threshold = (max_fds / 2);
905 validations_running = 0;
906 GNUNET_STATISTICS_set (GST_stats,
907 gettext_noop ("# validations running"),
910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
911 "Validation uses a fast start threshold of %u connections and a delay of %s\n",
912 validations_fast_start_threshold,
913 GNUNET_STRINGS_relative_time_to_string (validation_delay,
915 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
917 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
918 &process_peerinfo_hello, NULL);
923 * Stop the validation subsystem.
926 GST_validation_stop ()
928 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
929 &cleanup_validation_entry,
931 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
932 validation_map = NULL;
933 GNUNET_PEERINFO_notify_cancel (pnc);
938 * Send the given PONG to the given address.
940 * @param cls the PONG message
941 * @param valid_until is ZERO if we never validated the address,
942 * otherwise a time up to when we consider it (or was) valid
943 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
944 * is ZERO if the address is considered valid (no validation needed)
945 * otherwise a time in the future if we're currently denying re-validation
946 * @param address target address
949 multicast_pong (void *cls,
950 struct GNUNET_TIME_Absolute valid_until,
951 struct GNUNET_TIME_Absolute validation_block,
952 const struct GNUNET_HELLO_Address *address)
954 struct TransportPongMessage *pong = cls;
955 struct GNUNET_TRANSPORT_PluginFunctions *papi;
956 struct Session *session;
958 papi = GST_plugins_find (address->transport_name);
961 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
962 "Plugin %s not supported, cannot send PONG\n",
963 address->transport_name);
966 GNUNET_assert (NULL != papi->send);
967 GNUNET_assert (NULL != papi->get_session);
968 session = papi->get_session(papi->cls, address);
974 GST_ats_new_session (address, session);
975 papi->send (papi->cls, session,
977 ntohs (pong->header.size),
979 ACCEPTABLE_PING_DELAY,
981 GST_neighbours_notify_data_sent (address,
988 * We've received a PING. If appropriate, generate a PONG.
990 * @param sender peer sending the PING
991 * @param hdr the PING
992 * @param sender_address the sender address as we got it
993 * @param session session we got the PING from
994 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
997 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
998 const struct GNUNET_MessageHeader *hdr,
999 const struct GNUNET_HELLO_Address *sender_address,
1000 struct Session *session)
1002 const struct TransportPingMessage *ping;
1003 struct TransportPongMessage *pong;
1004 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1005 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
1006 struct GNUNET_TIME_Absolute *sig_cache_exp;
1008 const char *addrend;
1014 struct GNUNET_HELLO_Address address;
1016 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1018 GNUNET_break_op (0);
1019 return GNUNET_SYSERR;
1021 ping = (const struct TransportPingMessage *) hdr;
1023 memcmp (&ping->target, &GST_my_identity,
1024 sizeof (struct GNUNET_PeerIdentity)))
1026 GNUNET_STATISTICS_update (GST_stats,
1028 ("# PING message for different peer received"), 1,
1030 return GNUNET_SYSERR;
1032 GNUNET_STATISTICS_update (GST_stats,
1033 gettext_noop ("# PING messages received"), 1,
1035 addr = (const char *) &ping[1];
1036 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1037 /* peer wants to confirm that this is one of our addresses, this is what is
1038 * used for address validation */
1041 sig_cache_exp = NULL;
1043 if (len_address > 0)
1045 addrend = memchr (addr, '\0', len_address);
1046 if (NULL == addrend)
1048 GNUNET_break_op (0);
1049 return GNUNET_SYSERR;
1052 len_plugin = strlen (addr) + 1;
1053 len_address -= len_plugin;
1054 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1055 address.address = addrend;
1056 address.address_length = len_address;
1057 address.transport_name = addr;
1058 address.peer = GST_my_identity;
1060 if (NULL == address.transport_name)
1065 if (0 != strstr (address.transport_name, "_client"))
1067 plugin_name = GNUNET_strdup (address.transport_name);
1068 pos = strstr (plugin_name, "_client");
1069 GNUNET_assert (NULL != pos);
1070 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1073 plugin_name = GNUNET_strdup (address.transport_name);
1075 if (NULL == (papi = GST_plugins_find (plugin_name)))
1077 /* we don't have the plugin for this address */
1078 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1079 _("Plugin `%s' not available, cannot confirm having this address\n"),
1081 GNUNET_free (plugin_name);
1082 return GNUNET_SYSERR;
1084 GNUNET_free (plugin_name);
1086 papi->check_address (papi->cls,
1090 GNUNET_STATISTICS_update (GST_stats,
1092 ("# failed address checks during validation"), 1,
1094 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1095 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1096 GST_plugins_a2s (&address));
1097 return GNUNET_SYSERR;
1101 GNUNET_STATISTICS_update (GST_stats,
1103 ("# successful address checks during validation"), 1,
1105 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1106 "Address `%s' is one of my addresses, confirming PING\n",
1107 GST_plugins_a2s (&address));
1111 GST_hello_test_address (&address,
1115 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1116 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1117 GNUNET_i2s (sender),
1118 GST_plugins_a2s (&address));
1119 return GNUNET_SYSERR;
1124 addrend = NULL; /* make gcc happy */
1126 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1127 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1129 sig_cache = &no_address_signature;
1130 sig_cache_exp = &no_address_signature_expiration;
1133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1134 "I am `%s', sending PONG to peer `%s'\n",
1135 GNUNET_i2s_full (&GST_my_identity),
1136 GNUNET_i2s (sender));
1138 /* message with structure:
1139 * [TransportPongMessage][Transport name][Address] */
1141 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1143 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1144 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1145 pong->purpose.size =
1146 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1147 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1148 len_address + len_plugin);
1149 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1150 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1151 pong->addrlen = htonl (len_address + len_plugin);
1152 memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1153 if (len_address > 0)
1155 GNUNET_assert (NULL != addrend);
1156 memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1158 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1159 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1161 /* create / update cached sig */
1162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1163 "Creating PONG signature to indicate ownership.\n");
1164 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1165 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1167 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1170 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1171 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1176 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1178 pong->signature = *sig_cache;
1180 GNUNET_assert (NULL != sender_address);
1182 /* first see if the session we got this PING from can be used to transmit
1183 * a response reliably */
1190 GNUNET_assert (NULL != papi->send);
1191 GNUNET_assert (NULL != papi->get_session);
1192 if (NULL == session)
1194 session = papi->get_session (papi->cls, sender_address);
1196 if (NULL == session)
1203 ret = papi->send (papi->cls, session,
1204 (const char *) pong,
1205 ntohs (pong->header.size),
1206 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1209 GST_neighbours_notify_data_sent (sender_address,
1216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1217 "Transmitted PONG to `%s' via reliable mechanism\n",
1218 GNUNET_i2s (sender));
1220 GNUNET_STATISTICS_update (GST_stats,
1222 ("# PONGs unicast via reliable transport"), 1,
1228 /* no reliable method found, try transmission via all known addresses */
1229 GNUNET_STATISTICS_update (GST_stats,
1231 ("# PONGs multicast to all available addresses"), 1,
1233 GST_validation_get_addresses (sender,
1234 &multicast_pong, pong);
1241 * Validate an individual address.
1243 * @param address address we should try to validate
1246 GST_validation_handle_address (const struct GNUNET_HELLO_Address *address)
1248 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1249 struct ValidationEntry *ve;
1251 papi = GST_plugins_find (address->transport_name);
1254 /* This plugin is currently unvailable ... ignore */
1257 ve = find_validation_entry (address);
1258 if (NULL == ve->revalidation_task)
1260 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1261 "Validation process started for fresh address `%s' of %s\n",
1262 GST_plugins_a2s (ve->address),
1263 GNUNET_i2s (&ve->address->peer));
1264 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1270 * Iterator callback to go over all addresses and try to validate them
1271 * (unless blocked or already validated).
1274 * @param address the address
1275 * @param expiration expiration time
1276 * @return #GNUNET_OK (keep the address)
1279 validate_address_iterator (void *cls,
1280 const struct GNUNET_HELLO_Address *address,
1281 struct GNUNET_TIME_Absolute expiration)
1283 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1286 "Skipping expired address from HELLO\n");
1287 return GNUNET_OK; /* expired */
1289 GST_validation_handle_address (address);
1295 * Add the validated peer address to the HELLO.
1297 * @param cls the `struct ValidationEntry *` with the validated address
1298 * @param max space in @a buf
1299 * @param buf where to add the address
1300 * @return number of bytes written, #GNUNET_SYSERR to signal the
1301 * end of the iteration.
1304 add_valid_peer_address (void *cls,
1308 struct ValidationEntry *ve = cls;
1310 if (GNUNET_YES == ve->copied)
1311 return GNUNET_SYSERR; /* Done */
1312 ve->copied = GNUNET_YES;
1313 return GNUNET_HELLO_add_address (ve->address,
1321 * We've received a PONG. Check if it matches a pending PING and
1322 * mark the respective address as confirmed.
1324 * @param sender peer sending the PONG
1325 * @param hdr the PONG
1326 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1329 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1330 const struct GNUNET_MessageHeader *hdr)
1332 const struct TransportPongMessage *pong;
1333 struct ValidationEntry *ve;
1339 struct GNUNET_HELLO_Message *hello;
1340 struct GNUNET_HELLO_Address address;
1344 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1346 GNUNET_break_op (0);
1347 return GNUNET_SYSERR;
1349 GNUNET_STATISTICS_update (GST_stats,
1350 gettext_noop ("# PONG messages received"), 1,
1353 /* message with structure:
1354 * [TransportPongMessage][Transport name][Address] */
1356 pong = (const struct TransportPongMessage *) hdr;
1357 tname = (const char *) &pong[1];
1358 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1359 addr = memchr (tname, '\0', size);
1362 GNUNET_break_op (0);
1363 return GNUNET_SYSERR;
1366 slen = strlen (tname) + 1;
1367 addrlen = size - slen;
1369 if (NULL == GST_plugins_find (tname))
1371 /* we got the PONG, but the transport plugin specified in it
1372 is not supported by this peer, so this cannot be a good
1374 GNUNET_break_op (0);
1378 address.peer = *sender;
1379 address.address = addr;
1380 address.address_length = addrlen;
1381 address.transport_name = tname;
1382 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1383 ve = find_validation_entry (&address);
1384 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1386 GNUNET_STATISTICS_update (GST_stats,
1388 ("# PONGs dropped, no matching pending validation"),
1392 /* now check that PONG is well-formed */
1393 if (0 != memcmp (&ve->address->peer,
1395 sizeof (struct GNUNET_PeerIdentity)))
1397 GNUNET_break_op (0);
1398 return GNUNET_SYSERR;
1401 GNUNET_TIME_absolute_get_remaining
1402 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1404 GNUNET_STATISTICS_update (GST_stats,
1406 ("# PONGs dropped, signature expired"), 1,
1408 return GNUNET_SYSERR;
1411 sig_res = GNUNET_SYSERR;
1412 do_verify = GNUNET_YES;
1413 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1415 /* We have a cached and valid signature for this peer,
1416 * try to compare instead of verify */
1417 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1419 /* signatures are identical, we can skip verification */
1420 sig_res = GNUNET_OK;
1421 do_verify = GNUNET_NO;
1425 sig_res = GNUNET_SYSERR;
1426 /* signatures do not match, we have to verify */
1430 if (GNUNET_YES == do_verify)
1432 /* Do expensive verification */
1433 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1434 &pong->purpose, &pong->signature,
1435 &ve->address->peer.public_key);
1436 if (sig_res == GNUNET_SYSERR)
1438 GNUNET_break_op (0);
1439 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1440 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1442 GST_plugins_a2s (ve->address),
1443 GNUNET_i2s (sender));
1446 if (sig_res == GNUNET_SYSERR)
1448 GNUNET_break_op (0);
1449 return GNUNET_SYSERR;
1452 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1453 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1454 GNUNET_i2s (sender),
1456 GST_plugins_a2s (ve->address));
1457 GNUNET_STATISTICS_update (GST_stats,
1458 gettext_noop ("# validations succeeded"),
1461 /* validity achieved, remember it! */
1462 ve->expecting_pong = GNUNET_NO;
1463 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1464 ve->pong_sig_cache = pong->signature;
1465 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1466 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1468 struct GNUNET_ATS_Information ats[2];
1470 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1471 ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
1472 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1473 ats[1].value = htonl ((uint32_t) ve->network);
1474 if (GNUNET_YES == ve->known_to_ats)
1476 GST_ats_update_metrics (ve->address, NULL, ats, 2);
1480 ve->known_to_ats = GNUNET_YES;
1481 GST_ats_add_address (ve->address, ats, 2);
1484 if (validations_running > 0)
1486 validations_running--;
1487 GNUNET_STATISTICS_set (GST_stats,
1488 gettext_noop ("# validations running"),
1489 validations_running,
1491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1492 "Validation finished, %u validation processes running\n",
1493 validations_running);
1500 /* Notify about new validity */
1501 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1503 /* build HELLO to store in PEERINFO */
1504 ve->copied = GNUNET_NO;
1505 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1506 &add_valid_peer_address, ve,
1508 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1509 GNUNET_free (hello);
1515 * We've received a HELLO, check which addresses are new and trigger
1518 * @param hello the HELLO we received
1519 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1522 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1524 const struct GNUNET_HELLO_Message *hm =
1525 (const struct GNUNET_HELLO_Message *) hello;
1526 struct GNUNET_PeerIdentity pid;
1527 struct GNUNET_HELLO_Message *h;
1530 friend = GNUNET_HELLO_is_friend_only (hm);
1531 if ( ( (GNUNET_YES != friend) &&
1532 (GNUNET_NO != friend) ) ||
1533 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1535 /* malformed HELLO */
1536 GNUNET_break_op (0);
1537 return GNUNET_SYSERR;
1540 memcmp (&GST_my_identity,
1542 sizeof (struct GNUNET_PeerIdentity)))
1544 /* got our own HELLO, how boring */
1548 GNUNET_CONTAINER_multipeermap_contains (validation_map,
1551 /* Add peer identity without addresses to peerinfo service */
1552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1553 "Adding HELLO without addresses for peer `%s'\n",
1555 h = GNUNET_HELLO_create (&pid.public_key, NULL, NULL, friend);
1556 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1563 "Validation received HELLO message for peer `%s' with size %u, checking for new addresses\n",
1565 ntohs (hello->size));
1567 GNUNET_assert (NULL ==
1568 GNUNET_HELLO_iterate_addresses (hm,
1570 &validate_address_iterator,
1577 * Closure for #iterate_addresses().
1579 struct IteratorContext
1582 * Function to call on each address.
1584 GST_ValidationAddressCallback cb;
1587 * Closure for @e cb.
1595 * Call the callback in the closure for each validation entry.
1597 * @param cls the `struct IteratorContext`
1598 * @param key the peer's identity
1599 * @param value the `struct ValidationEntry`
1600 * @return #GNUNET_OK (continue to iterate)
1603 iterate_addresses (void *cls,
1604 const struct GNUNET_PeerIdentity *key,
1607 struct IteratorContext *ic = cls;
1608 struct ValidationEntry *ve = value;
1612 ve->revalidation_block,
1619 * Call the given function for each address for the given target.
1620 * Can either give a snapshot (synchronous API) or be continuous.
1622 * @param target peer information is requested for
1623 * @param cb function to call; will not be called after this function returns
1624 * @param cb_cls closure for @a cb
1627 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1628 GST_ValidationAddressCallback cb,
1631 struct IteratorContext ic;
1635 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1637 &iterate_addresses, &ic);
1642 * Update if we are using an address for a connection actively right now.
1643 * Based on this, the validation module will measure latency for the
1644 * address more or less often.
1646 * @param address the address that we are now using (or not)
1647 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1648 * #GNUNET_NO if we are no longer using the address for a connection
1651 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1654 struct ValidationEntry *ve;
1656 if (GNUNET_HELLO_address_check_option (address,
1657 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1658 return; /* ignore inbound for validation */
1659 if (NULL == GST_plugins_find (address->transport_name))
1661 /* How can we use an address for which we don't have the plugin? */
1665 ve = find_validation_entry (address);
1671 if (in_use == ve->in_use)
1673 ve->in_use = in_use;
1674 if (GNUNET_YES == in_use)
1676 /* from now on, higher frequeny, so reschedule now */
1677 if (NULL != ve->revalidation_task)
1678 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1679 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address,
1686 * Closure for the validation_entries_iterate function.
1688 struct ValidationIteratorContext
1691 * Function to call on each validation entry
1693 GST_ValidationChangedCallback cb;
1696 * Closure for @e cb.
1703 * Function called on each entry in the validation map.
1704 * Passes the information from the validation entry to
1705 * the callback given in the closure.
1707 * @param cls the `struct ValidationIteratorContext`
1708 * @param key peer this is about
1709 * @param value the `struct ValidationEntry`
1710 * @return #GNUNET_OK (continue to iterate)
1713 validation_entries_iterate (void *cls,
1714 const struct GNUNET_PeerIdentity *key,
1717 struct ValidationIteratorContext *ic = cls;
1718 struct ValidationEntry *ve = value;
1720 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1721 "Notifying about validation entry for peer `%s' address `%s' \n",
1722 GNUNET_i2s (&ve->address->peer),
1723 GST_plugins_a2s (ve->address));
1728 ve->next_validation,
1735 * Iterate over all iteration entries
1737 * @param cb function to call
1738 * @param cb_cls closure for @a cb
1741 GST_validation_iterate (GST_ValidationChangedCallback cb,
1744 struct ValidationIteratorContext ic;
1746 if (NULL == validation_map)
1747 return; /* can happen during shutdown */
1750 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1751 &validation_entries_iterate,
1755 /* end of file gnunet-service-transport_validation.c */