2 This file is part of GNUnet.
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 ();
535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
536 "Transmitting plain PING to `%s' `%s' `%s'\n",
538 GST_plugins_a2s (ve->address),
539 ve->address->transport_name);
541 slen = strlen (ve->address->transport_name) + 1;
542 hsize = ntohs (hello->size);
544 sizeof (struct TransportPingMessage) + ve->address->address_length +
548 htons (sizeof (struct TransportPingMessage) +
549 ve->address->address_length + slen);
550 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
551 ping.challenge = htonl (ve->challenge);
554 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
559 sizeof (struct TransportPingMessage) + ve->address->address_length +
563 char message_buf[tsize];
565 /* build message with structure:
566 * [HELLO][TransportPingMessage][Transport name][Address] */
567 memcpy (message_buf, hello, hsize);
568 memcpy (&message_buf[hsize],
570 sizeof (struct TransportPingMessage));
571 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
572 ve->address->transport_name,
574 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
575 ve->address->address,
576 ve->address->address_length);
577 papi = GST_plugins_find (ve->address->transport_name);
578 GNUNET_assert (NULL != papi);
579 GNUNET_assert (NULL != papi->send);
580 struct Session *session = papi->get_session (papi->cls,
585 ret = papi->send (papi->cls, session,
588 ACCEPTABLE_PING_DELAY,
590 network = papi->get_network (papi->cls, session);
591 if (GNUNET_ATS_NET_UNSPECIFIED == network)
593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
594 "Could not obtain a valid network for `%s' `%s'\n",
596 GST_plugins_a2s (ve->address));
599 GST_neighbours_notify_data_sent (ve->address, session, tsize);
603 /* Could not get a valid session */
604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
605 "Could not get a valid session for `%s' `%s'\n",
607 GST_plugins_a2s (ve->address));
613 next = GNUNET_TIME_relative_to_absolute (validation_delay);
614 validation_next = GNUNET_TIME_absolute_max (next,
616 ve->send_time = GNUNET_TIME_absolute_get ();
617 GNUNET_STATISTICS_update (GST_stats,
618 gettext_noop ("# PINGs for address validation sent"),
621 ve->network = network;
622 ve->expecting_pong = GNUNET_YES;
623 validations_running++;
624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
625 "Validation started, %u validation processes running\n",
626 validations_running);
627 GNUNET_STATISTICS_set (GST_stats,
628 gettext_noop ("# validations running"),
631 /* Notify about PING sent */
632 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
638 * Do address validation again to keep address valid.
640 * @param cls the `struct ValidationEntry`
641 * @param tc scheduler context (unused)
644 revalidate_address (void *cls,
645 const struct GNUNET_SCHEDULER_TaskContext *tc)
647 struct ValidationEntry *ve = cls;
648 struct GNUNET_TIME_Relative canonical_delay;
649 struct GNUNET_TIME_Relative delay;
650 struct GNUNET_TIME_Relative blocked_for;
651 struct GST_BlacklistCheck *bc;
654 ve->revalidation_task = NULL;
655 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
656 /* Considering current connectivity situation, what is the maximum
657 block period permitted? */
658 if (GNUNET_YES == ve->in_use)
659 canonical_delay = CONNECTED_PING_FREQUENCY;
660 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
661 canonical_delay = VALIDATED_PING_FREQUENCY;
663 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
664 /* Use delay that is MIN of original delay and possibly adjusted
665 new maximum delay (which may be lower); the real delay
666 is originally randomized between "canonical_delay" and "2 * canonical_delay",
667 so continue to permit that window for the operation. */
668 delay = GNUNET_TIME_relative_min (delay,
669 GNUNET_TIME_relative_multiply (canonical_delay,
671 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
672 if (delay.rel_value_us > 0)
674 /* should wait a bit longer */
675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
676 "Waiting for %s longer before validating address `%s'\n",
677 GNUNET_STRINGS_relative_time_to_string (delay,
679 GST_plugins_a2s (ve->address));
680 ve->revalidation_task =
681 GNUNET_SCHEDULER_add_delayed (delay,
682 &revalidate_address, ve);
683 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
686 /* check if globally we have too many active validations at a
687 too high rate, if so, delay ours */
688 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
689 if ( (validations_running > validations_fast_start_threshold) &&
690 (blocked_for.rel_value_us > 0) )
692 /* Validations are blocked, have to wait for blocked_for time */
693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
694 "Validations blocked for another %s, delaying validating address `%s'\n",
695 GNUNET_STRINGS_relative_time_to_string (blocked_for,
697 GST_plugins_a2s (ve->address));
698 GNUNET_STATISTICS_update (GST_stats,
699 gettext_noop ("# validations delayed by global throttle"),
702 ve->revalidation_task =
703 GNUNET_SCHEDULER_add_delayed (blocked_for, &revalidate_address, ve);
704 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
708 /* We are good to go; remember to not go again for `canonical_delay` time;
709 add up to `canonical_delay` to randomize start time */
710 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
711 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
713 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
714 canonical_delay.rel_value_us);
716 delay = GNUNET_TIME_relative_add (canonical_delay,
717 GNUNET_TIME_relative_multiply
718 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
720 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
721 "Validating now, next scheduled for %s, now validating address `%s'\n",
722 GNUNET_STRINGS_relative_time_to_string (blocked_for,
724 GST_plugins_a2s (ve->address));
725 ve->revalidation_task =
726 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
727 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
729 /* start PINGing by checking blacklist */
730 GNUNET_STATISTICS_update (GST_stats,
731 gettext_noop ("# address revalidations started"), 1,
733 bc = GST_blacklist_test_allowed (&ve->address->peer,
734 ve->address->transport_name,
735 &transmit_ping_if_allowed, ve);
737 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
743 * Find a ValidationEntry entry for the given neighbour that matches
744 * the given address and transport. If none exists, create one (but
745 * without starting any validation).
747 * @param address address to find
748 * @return validation entry matching the given specifications, NULL
749 * if we don't have an existing entry and no public key was given
751 static struct ValidationEntry *
752 find_validation_entry (const struct GNUNET_HELLO_Address *address)
754 struct ValidationEntryMatchContext vemc;
755 struct ValidationEntry *ve;
758 vemc.address = address;
759 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
761 &validation_entry_match, &vemc);
762 if (NULL != (ve = vemc.ve))
764 ve = GNUNET_new (struct ValidationEntry);
765 ve->in_use = GNUNET_SYSERR; /* not defined */
766 ve->address = GNUNET_HELLO_address_copy (address);
767 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
768 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
769 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
771 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
773 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
774 &timeout_hello_validation, ve);
775 GNUNET_CONTAINER_multipeermap_put (validation_map, &address->peer,
777 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
778 publish_ve_stat_update ();
779 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
785 * Iterator which adds the given address to the set of validated
788 * @param cls original HELLO message
789 * @param address the address
790 * @param expiration expiration time
791 * @return #GNUNET_OK (keep the address), could return
792 * #GNUNET_NO (delete address, but this is ignored);
793 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
796 add_valid_address (void *cls,
797 const struct GNUNET_HELLO_Address *address,
798 struct GNUNET_TIME_Absolute expiration)
800 const struct GNUNET_HELLO_Message *hello = cls;
801 struct ValidationEntry *ve;
802 struct GNUNET_PeerIdentity pid;
803 struct GNUNET_ATS_Information ats;
805 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
806 return GNUNET_OK; /* expired */
807 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
810 return GNUNET_OK; /* invalid HELLO !? */
812 if (NULL == GST_plugins_find (address->transport_name))
814 /* might have been valid in the past, but we don't have that
815 plugin loaded right now */
819 ve = find_validation_entry (address);
820 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
822 if (NULL == ve->revalidation_task)
824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
825 "Starting revalidations for valid address `%s'\n",
826 GST_plugins_a2s (ve->address));
827 ve->next_validation = GNUNET_TIME_absolute_get();
828 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
830 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
832 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
833 ats.value = htonl (ve->network);
834 if (GNUNET_YES != ve->known_to_ats)
836 ve->known_to_ats = GNUNET_YES;
837 GST_ats_add_address (address, &ats, 1);
844 * Function called for any HELLO known to PEERINFO.
846 * @param cls unused (NULL)
847 * @param peer id of the peer, NULL for last call (during iteration,
848 * as we are monitoring, this should never happen)
849 * @param hello hello message for the peer (can be NULL)
850 * @param err_msg error message
853 process_peerinfo_hello (void *cls,
854 const struct GNUNET_PeerIdentity *peer,
855 const struct GNUNET_HELLO_Message *hello,
858 GNUNET_assert (NULL != peer);
861 if (0 == memcmp (&GST_my_identity,
863 sizeof (struct GNUNET_PeerIdentity)))
865 /* Peerinfo returned own identity, skip validation */
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
869 "Handling HELLO for peer `%s'\n",
871 GNUNET_assert (NULL ==
872 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
879 * Start the validation subsystem.
881 * @param max_fds maximum number of fds to use
884 GST_validation_start (unsigned int max_fds)
887 * Initialization for validation throttling
889 * We have a maximum number max_fds of connections we can use for validation
890 * We monitor the number of validations in parallel and start to throttle it
891 * when doing to many validations in parallel:
892 * if (running validations < (max_fds / 2))
893 * - "fast start": run validation immediately
894 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
895 * (300 sec / ~150 == ~2 sec.) between two validations
898 validation_next = GNUNET_TIME_absolute_get();
899 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
900 validations_fast_start_threshold = (max_fds / 2);
901 validations_running = 0;
902 GNUNET_STATISTICS_set (GST_stats,
903 gettext_noop ("# validations running"),
906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
907 "Validation uses a fast start threshold of %u connections and a delay of %s\n",
908 validations_fast_start_threshold,
909 GNUNET_STRINGS_relative_time_to_string (validation_delay,
911 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
913 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
914 &process_peerinfo_hello, NULL);
919 * Stop the validation subsystem.
922 GST_validation_stop ()
924 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
925 &cleanup_validation_entry,
927 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
928 validation_map = NULL;
929 GNUNET_PEERINFO_notify_cancel (pnc);
934 * Send the given PONG to the given address.
936 * @param cls the PONG message
937 * @param valid_until is ZERO if we never validated the address,
938 * otherwise a time up to when we consider it (or was) valid
939 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
940 * is ZERO if the address is considered valid (no validation needed)
941 * otherwise a time in the future if we're currently denying re-validation
942 * @param address target address
945 multicast_pong (void *cls,
946 struct GNUNET_TIME_Absolute valid_until,
947 struct GNUNET_TIME_Absolute validation_block,
948 const struct GNUNET_HELLO_Address *address)
950 struct TransportPongMessage *pong = cls;
951 struct GNUNET_TRANSPORT_PluginFunctions *papi;
952 struct Session *session;
954 papi = GST_plugins_find (address->transport_name);
957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
958 "Plugin %s not supported, cannot send PONG\n",
959 address->transport_name);
962 GNUNET_assert (NULL != papi->send);
963 GNUNET_assert (NULL != papi->get_session);
964 session = papi->get_session(papi->cls, address);
970 GST_ats_new_session (address, session);
971 papi->send (papi->cls, session,
973 ntohs (pong->header.size),
975 ACCEPTABLE_PING_DELAY,
977 GST_neighbours_notify_data_sent (address,
984 * We've received a PING. If appropriate, generate a PONG.
986 * @param sender peer sending the PING
987 * @param hdr the PING
988 * @param sender_address the sender address as we got it
989 * @param session session we got the PING from
990 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
993 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
994 const struct GNUNET_MessageHeader *hdr,
995 const struct GNUNET_HELLO_Address *sender_address,
996 struct Session *session)
998 const struct TransportPingMessage *ping;
999 struct TransportPongMessage *pong;
1000 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1001 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
1002 struct GNUNET_TIME_Absolute *sig_cache_exp;
1004 const char *addrend;
1010 struct GNUNET_HELLO_Address address;
1012 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1014 GNUNET_break_op (0);
1015 return GNUNET_SYSERR;
1017 ping = (const struct TransportPingMessage *) hdr;
1019 memcmp (&ping->target, &GST_my_identity,
1020 sizeof (struct GNUNET_PeerIdentity)))
1022 GNUNET_STATISTICS_update (GST_stats,
1024 ("# PING message for different peer received"), 1,
1026 return GNUNET_SYSERR;
1028 GNUNET_STATISTICS_update (GST_stats,
1029 gettext_noop ("# PING messages received"), 1,
1031 addr = (const char *) &ping[1];
1032 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1033 /* peer wants to confirm that this is one of our addresses, this is what is
1034 * used for address validation */
1037 sig_cache_exp = NULL;
1039 if (len_address > 0)
1041 addrend = memchr (addr, '\0', len_address);
1042 if (NULL == addrend)
1044 GNUNET_break_op (0);
1045 return GNUNET_SYSERR;
1048 len_plugin = strlen (addr) + 1;
1049 len_address -= len_plugin;
1050 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1051 address.address = addrend;
1052 address.address_length = len_address;
1053 address.transport_name = addr;
1054 address.peer = GST_my_identity;
1056 if (NULL == address.transport_name)
1061 if (0 != strstr (address.transport_name, "_client"))
1063 plugin_name = GNUNET_strdup (address.transport_name);
1064 pos = strstr (plugin_name, "_client");
1065 GNUNET_assert (NULL != pos);
1066 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1069 plugin_name = GNUNET_strdup (address.transport_name);
1071 if (NULL == (papi = GST_plugins_find (plugin_name)))
1073 /* we don't have the plugin for this address */
1074 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1075 _("Plugin `%s' not available, cannot confirm having this address\n"),
1077 GNUNET_free (plugin_name);
1078 return GNUNET_SYSERR;
1080 GNUNET_free (plugin_name);
1082 papi->check_address (papi->cls,
1086 GNUNET_STATISTICS_update (GST_stats,
1088 ("# failed address checks during validation"), 1,
1090 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1091 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1092 GST_plugins_a2s (&address));
1093 return GNUNET_SYSERR;
1097 GNUNET_STATISTICS_update (GST_stats,
1099 ("# successful address checks during validation"), 1,
1101 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1102 "Address `%s' is one of my addresses, confirming PING\n",
1103 GST_plugins_a2s (&address));
1107 GST_hello_test_address (&address,
1111 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1112 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1113 GNUNET_i2s (sender),
1114 GST_plugins_a2s (&address));
1115 return GNUNET_SYSERR;
1120 addrend = NULL; /* make gcc happy */
1122 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1123 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1125 sig_cache = &no_address_signature;
1126 sig_cache_exp = &no_address_signature_expiration;
1129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1130 "I am `%s', sending PONG to peer `%s'\n",
1131 GNUNET_i2s_full (&GST_my_identity),
1132 GNUNET_i2s (sender));
1134 /* message with structure:
1135 * [TransportPongMessage][Transport name][Address] */
1137 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1139 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1140 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1141 pong->purpose.size =
1142 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1143 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1144 len_address + len_plugin);
1145 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1146 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1147 pong->addrlen = htonl (len_address + len_plugin);
1148 memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1149 if (len_address > 0)
1151 GNUNET_assert (NULL != addrend);
1152 memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1154 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1155 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1157 /* create / update cached sig */
1158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1159 "Creating PONG signature to indicate ownership.\n");
1160 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1161 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1163 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1166 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1167 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1172 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1174 pong->signature = *sig_cache;
1176 GNUNET_assert (NULL != sender_address);
1178 /* first see if the session we got this PING from can be used to transmit
1179 * a response reliably */
1186 GNUNET_assert (NULL != papi->send);
1187 GNUNET_assert (NULL != papi->get_session);
1188 if (NULL == session)
1190 session = papi->get_session (papi->cls, sender_address);
1192 if (NULL == session)
1199 ret = papi->send (papi->cls, session,
1200 (const char *) pong,
1201 ntohs (pong->header.size),
1202 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1205 GST_neighbours_notify_data_sent (sender_address,
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1213 "Transmitted PONG to `%s' via reliable mechanism\n",
1214 GNUNET_i2s (sender));
1216 GNUNET_STATISTICS_update (GST_stats,
1218 ("# PONGs unicast via reliable transport"), 1,
1224 /* no reliable method found, try transmission via all known addresses */
1225 GNUNET_STATISTICS_update (GST_stats,
1227 ("# PONGs multicast to all available addresses"), 1,
1229 GST_validation_get_addresses (sender,
1230 &multicast_pong, pong);
1237 * Validate an individual address.
1239 * @param address address we should try to validate
1242 GST_validation_handle_address (const struct GNUNET_HELLO_Address *address)
1244 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1245 struct ValidationEntry *ve;
1247 papi = GST_plugins_find (address->transport_name);
1250 /* This plugin is currently unvailable ... ignore */
1253 ve = find_validation_entry (address);
1254 if (NULL == ve->revalidation_task)
1256 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1257 "Validation process started for fresh address `%s' of %s\n",
1258 GST_plugins_a2s (ve->address),
1259 GNUNET_i2s (&ve->address->peer));
1260 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1266 * Iterator callback to go over all addresses and try to validate them
1267 * (unless blocked or already validated).
1270 * @param address the address
1271 * @param expiration expiration time
1272 * @return #GNUNET_OK (keep the address)
1275 validate_address_iterator (void *cls,
1276 const struct GNUNET_HELLO_Address *address,
1277 struct GNUNET_TIME_Absolute expiration)
1279 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1282 "Skipping expired address from HELLO\n");
1283 return GNUNET_OK; /* expired */
1285 GST_validation_handle_address (address);
1291 * Add the validated peer address to the HELLO.
1293 * @param cls the `struct ValidationEntry *` with the validated address
1294 * @param max space in @a buf
1295 * @param buf where to add the address
1296 * @return number of bytes written, #GNUNET_SYSERR to signal the
1297 * end of the iteration.
1300 add_valid_peer_address (void *cls,
1304 struct ValidationEntry *ve = cls;
1306 if (GNUNET_YES == ve->copied)
1307 return GNUNET_SYSERR; /* Done */
1308 ve->copied = GNUNET_YES;
1309 return GNUNET_HELLO_add_address (ve->address,
1317 * We've received a PONG. Check if it matches a pending PING and
1318 * mark the respective address as confirmed.
1320 * @param sender peer sending the PONG
1321 * @param hdr the PONG
1322 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1325 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1326 const struct GNUNET_MessageHeader *hdr)
1328 const struct TransportPongMessage *pong;
1329 struct ValidationEntry *ve;
1335 struct GNUNET_HELLO_Message *hello;
1336 struct GNUNET_HELLO_Address address;
1340 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1342 GNUNET_break_op (0);
1343 return GNUNET_SYSERR;
1345 GNUNET_STATISTICS_update (GST_stats,
1346 gettext_noop ("# PONG messages received"), 1,
1349 /* message with structure:
1350 * [TransportPongMessage][Transport name][Address] */
1352 pong = (const struct TransportPongMessage *) hdr;
1353 tname = (const char *) &pong[1];
1354 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1355 addr = memchr (tname, '\0', size);
1358 GNUNET_break_op (0);
1359 return GNUNET_SYSERR;
1362 slen = strlen (tname) + 1;
1363 addrlen = size - slen;
1365 if (NULL == GST_plugins_find (tname))
1367 /* we got the PONG, but the transport plugin specified in it
1368 is not supported by this peer, so this cannot be a good
1370 GNUNET_break_op (0);
1374 address.peer = *sender;
1375 address.address = addr;
1376 address.address_length = addrlen;
1377 address.transport_name = tname;
1378 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1379 ve = find_validation_entry (&address);
1380 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1382 GNUNET_STATISTICS_update (GST_stats,
1384 ("# PONGs dropped, no matching pending validation"),
1388 /* now check that PONG is well-formed */
1389 if (0 != memcmp (&ve->address->peer,
1391 sizeof (struct GNUNET_PeerIdentity)))
1393 GNUNET_break_op (0);
1394 return GNUNET_SYSERR;
1397 GNUNET_TIME_absolute_get_remaining
1398 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1400 GNUNET_STATISTICS_update (GST_stats,
1402 ("# PONGs dropped, signature expired"), 1,
1404 return GNUNET_SYSERR;
1407 sig_res = GNUNET_SYSERR;
1408 do_verify = GNUNET_YES;
1409 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1411 /* We have a cached and valid signature for this peer,
1412 * try to compare instead of verify */
1413 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1415 /* signatures are identical, we can skip verification */
1416 sig_res = GNUNET_OK;
1417 do_verify = GNUNET_NO;
1421 sig_res = GNUNET_SYSERR;
1422 /* signatures do not match, we have to verify */
1426 if (GNUNET_YES == do_verify)
1428 /* Do expensive verification */
1429 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1430 &pong->purpose, &pong->signature,
1431 &ve->address->peer.public_key);
1432 if (sig_res == GNUNET_SYSERR)
1434 GNUNET_break_op (0);
1435 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1436 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1438 GST_plugins_a2s (ve->address),
1439 GNUNET_i2s (sender));
1442 if (sig_res == GNUNET_SYSERR)
1444 GNUNET_break_op (0);
1445 return GNUNET_SYSERR;
1448 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1449 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1450 GNUNET_i2s (sender),
1452 GST_plugins_a2s (ve->address));
1453 GNUNET_STATISTICS_update (GST_stats,
1454 gettext_noop ("# validations succeeded"),
1457 /* validity achieved, remember it! */
1458 ve->expecting_pong = GNUNET_NO;
1459 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1460 ve->pong_sig_cache = pong->signature;
1461 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1462 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1464 struct GNUNET_ATS_Information ats[2];
1466 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1467 ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
1468 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1469 ats[1].value = htonl ((uint32_t) ve->network);
1470 if (GNUNET_YES == ve->known_to_ats)
1472 GST_ats_update_metrics (ve->address, NULL, ats, 2);
1476 ve->known_to_ats = GNUNET_YES;
1477 GST_ats_add_address (ve->address, ats, 2);
1480 if (validations_running > 0)
1482 validations_running--;
1483 GNUNET_STATISTICS_set (GST_stats,
1484 gettext_noop ("# validations running"),
1485 validations_running,
1487 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1488 "Validation finished, %u validation processes running\n",
1489 validations_running);
1496 /* Notify about new validity */
1497 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1499 /* build HELLO to store in PEERINFO */
1500 ve->copied = GNUNET_NO;
1501 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1502 &add_valid_peer_address, ve,
1504 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1505 GNUNET_free (hello);
1511 * We've received a HELLO, check which addresses are new and trigger
1514 * @param hello the HELLO we received
1515 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1518 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1520 const struct GNUNET_HELLO_Message *hm =
1521 (const struct GNUNET_HELLO_Message *) hello;
1522 struct GNUNET_PeerIdentity pid;
1523 struct GNUNET_HELLO_Message *h;
1526 friend = GNUNET_HELLO_is_friend_only (hm);
1527 if ( ( (GNUNET_YES != friend) &&
1528 (GNUNET_NO != friend) ) ||
1529 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1531 /* malformed HELLO */
1532 GNUNET_break_op (0);
1533 return GNUNET_SYSERR;
1536 memcmp (&GST_my_identity,
1538 sizeof (struct GNUNET_PeerIdentity)))
1540 /* got our own HELLO, how boring */
1544 GNUNET_CONTAINER_multipeermap_contains (validation_map,
1547 /* Add peer identity without addresses to peerinfo service */
1548 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1549 "Adding HELLO without addresses for peer `%s'\n",
1551 h = GNUNET_HELLO_create (&pid.public_key, NULL, NULL, friend);
1552 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1559 "Validation received HELLO message for peer `%s' with size %u, checking for new addresses\n",
1561 ntohs (hello->size));
1563 GNUNET_assert (NULL ==
1564 GNUNET_HELLO_iterate_addresses (hm,
1566 &validate_address_iterator,
1573 * Closure for #iterate_addresses().
1575 struct IteratorContext
1578 * Function to call on each address.
1580 GST_ValidationAddressCallback cb;
1583 * Closure for @e cb.
1591 * Call the callback in the closure for each validation entry.
1593 * @param cls the `struct IteratorContext`
1594 * @param key the peer's identity
1595 * @param value the `struct ValidationEntry`
1596 * @return #GNUNET_OK (continue to iterate)
1599 iterate_addresses (void *cls,
1600 const struct GNUNET_PeerIdentity *key,
1603 struct IteratorContext *ic = cls;
1604 struct ValidationEntry *ve = value;
1608 ve->revalidation_block,
1615 * Call the given function for each address for the given target.
1616 * Can either give a snapshot (synchronous API) or be continuous.
1618 * @param target peer information is requested for
1619 * @param cb function to call; will not be called after this function returns
1620 * @param cb_cls closure for @a cb
1623 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1624 GST_ValidationAddressCallback cb,
1627 struct IteratorContext ic;
1631 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1633 &iterate_addresses, &ic);
1638 * Update if we are using an address for a connection actively right now.
1639 * Based on this, the validation module will measure latency for the
1640 * address more or less often.
1642 * @param address the address that we are now using (or not)
1643 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1644 * #GNUNET_NO if we are no longer using the address for a connection
1647 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1650 struct ValidationEntry *ve;
1652 if (GNUNET_HELLO_address_check_option (address,
1653 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1654 return; /* ignore inbound for validation */
1655 if (NULL == GST_plugins_find (address->transport_name))
1657 /* How can we use an address for which we don't have the plugin? */
1661 ve = find_validation_entry (address);
1667 if (in_use == ve->in_use)
1669 ve->in_use = in_use;
1670 if (GNUNET_YES == in_use)
1672 /* from now on, higher frequeny, so reschedule now */
1673 if (NULL != ve->revalidation_task)
1674 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1675 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address,
1682 * Closure for the validation_entries_iterate function.
1684 struct ValidationIteratorContext
1687 * Function to call on each validation entry
1689 GST_ValidationChangedCallback cb;
1692 * Closure for @e cb.
1699 * Function called on each entry in the validation map.
1700 * Passes the information from the validation entry to
1701 * the callback given in the closure.
1703 * @param cls the `struct ValidationIteratorContext`
1704 * @param key peer this is about
1705 * @param value the `struct ValidationEntry`
1706 * @return #GNUNET_OK (continue to iterate)
1709 validation_entries_iterate (void *cls,
1710 const struct GNUNET_PeerIdentity *key,
1713 struct ValidationIteratorContext *ic = cls;
1714 struct ValidationEntry *ve = value;
1716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1717 "Notifying about validation entry for peer `%s' address `%s' \n",
1718 GNUNET_i2s (&ve->address->peer),
1719 GST_plugins_a2s (ve->address));
1724 ve->next_validation,
1731 * Iterate over all iteration entries
1733 * @param cb function to call
1734 * @param cb_cls closure for @a cb
1737 GST_validation_iterate (GST_ValidationChangedCallback cb,
1740 struct ValidationIteratorContext ic;
1742 if (NULL == validation_map)
1743 return; /* can happen during shutdown */
1746 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1747 &validation_entries_iterate,
1751 /* end of file gnunet-service-transport_validation.c */