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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 address_null address associated with the request, always NULL
509 * @param session_null session associated with the request, always NULL
510 * @param result #GNUNET_OK if the connection is allowed,
512 * #GNUNET_SYSERR if operation was aborted
515 transmit_ping_if_allowed (void *cls,
516 const struct GNUNET_PeerIdentity *pid,
517 const struct GNUNET_HELLO_Address *address_null,
518 struct Session *session_null,
521 struct ValidationEntry *ve = cls;
522 struct TransportPingMessage ping;
523 struct GNUNET_TRANSPORT_PluginFunctions *papi;
524 struct GNUNET_TIME_Absolute next;
525 const struct GNUNET_MessageHeader *hello;
530 struct Session *session;
533 if (GNUNET_OK != result)
535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
536 "Blacklist denies sending PING to `%s' `%s' `%s'\n",
538 GST_plugins_a2s (ve->address),
539 ve->address->transport_name);
540 GNUNET_STATISTICS_update (GST_stats,
541 gettext_noop ("# address records discarded (blacklist)"),
544 cleanup_validation_entry (NULL,
549 hello = GST_hello_get ();
550 GNUNET_assert (NULL != hello);
551 slen = strlen (ve->address->transport_name) + 1;
552 hsize = ntohs (hello->size);
553 tsize = sizeof (struct TransportPingMessage) +
554 ve->address->address_length + slen + hsize;
557 htons (sizeof (struct TransportPingMessage) +
558 ve->address->address_length + slen);
559 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
560 ping.challenge = htonl (ve->challenge);
563 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
568 sizeof (struct TransportPingMessage) + ve->address->address_length +
572 char message_buf[tsize] GNUNET_ALIGN;
577 memcpy (&message_buf[hsize],
579 sizeof (struct TransportPingMessage));
580 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
581 ve->address->transport_name,
583 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
584 ve->address->address,
585 ve->address->address_length);
586 papi = GST_plugins_find (ve->address->transport_name);
587 GNUNET_assert (NULL != papi);
588 session = papi->get_session (papi->cls,
592 /* Could not get a valid session */
593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
594 "Failed to get session to send PING to `%s' at `%s'\n",
596 GST_plugins_a2s (ve->address));
600 ret = papi->send (papi->cls, session,
603 ACCEPTABLE_PING_DELAY,
607 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
608 "Failed to send PING to `%s' at `%s'\n",
610 GST_plugins_a2s (ve->address));
613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
614 "Transmitted plain PING to `%s' `%s' `%s'\n",
616 GST_plugins_a2s (ve->address),
617 ve->address->transport_name);
618 ve->network = papi->get_network (papi->cls,
620 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != ve->network);
621 GST_neighbours_notify_data_sent (ve->address,
624 next = GNUNET_TIME_relative_to_absolute (validation_delay);
625 validation_next = GNUNET_TIME_absolute_max (next,
627 ve->send_time = GNUNET_TIME_absolute_get ();
628 GNUNET_STATISTICS_update (GST_stats,
629 gettext_noop ("# PINGs for address validation sent"),
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,
643 GNUNET_TRANSPORT_VS_UPDATE);
650 * Do address validation again to keep address valid.
652 * @param cls the `struct ValidationEntry`
653 * @param tc scheduler context (unused)
656 revalidate_address (void *cls,
657 const struct GNUNET_SCHEDULER_TaskContext *tc)
659 struct ValidationEntry *ve = cls;
660 struct GNUNET_TIME_Relative canonical_delay;
661 struct GNUNET_TIME_Relative delay;
662 struct GNUNET_TIME_Relative blocked_for;
663 struct GST_BlacklistCheck *bc;
666 ve->revalidation_task = NULL;
667 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
668 /* Considering current connectivity situation, what is the maximum
669 block period permitted? */
670 if (GNUNET_YES == ve->in_use)
671 canonical_delay = CONNECTED_PING_FREQUENCY;
672 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
673 canonical_delay = VALIDATED_PING_FREQUENCY;
675 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
676 /* Use delay that is MIN of original delay and possibly adjusted
677 new maximum delay (which may be lower); the real delay
678 is originally randomized between "canonical_delay" and "2 * canonical_delay",
679 so continue to permit that window for the operation. */
680 delay = GNUNET_TIME_relative_min (delay,
681 GNUNET_TIME_relative_multiply (canonical_delay,
683 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
684 if (delay.rel_value_us > 0)
686 /* should wait a bit longer */
687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
688 "Waiting for %s longer before (re)validating address `%s'\n",
689 GNUNET_STRINGS_relative_time_to_string (delay,
691 GST_plugins_a2s (ve->address));
692 ve->revalidation_task =
693 GNUNET_SCHEDULER_add_delayed (delay,
694 &revalidate_address, ve);
695 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
698 /* check if globally we have too many active validations at a
699 too high rate, if so, delay ours */
700 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
701 if ( (validations_running > validations_fast_start_threshold) &&
702 (blocked_for.rel_value_us > 0) )
704 /* Validations are blocked, have to wait for blocked_for time */
705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
706 "Validations blocked for another %s, delaying validating address `%s'\n",
707 GNUNET_STRINGS_relative_time_to_string (blocked_for,
709 GST_plugins_a2s (ve->address));
710 GNUNET_STATISTICS_update (GST_stats,
711 gettext_noop ("# validations delayed by global throttle"),
714 ve->revalidation_task =
715 GNUNET_SCHEDULER_add_delayed (blocked_for,
718 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
722 /* We are good to go; remember to not go again for `canonical_delay` time;
723 add up to `canonical_delay` to randomize start time */
724 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
725 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
727 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
728 canonical_delay.rel_value_us);
730 delay = GNUNET_TIME_relative_add (canonical_delay,
731 GNUNET_TIME_relative_multiply
732 (GNUNET_TIME_UNIT_MICROSECONDS,
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Validating now, next scheduled for %s, now validating address `%s'\n",
737 GNUNET_STRINGS_relative_time_to_string (blocked_for,
739 GST_plugins_a2s (ve->address));
740 ve->revalidation_task =
741 GNUNET_SCHEDULER_add_delayed (delay,
744 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
746 /* start PINGing by checking blacklist */
747 GNUNET_STATISTICS_update (GST_stats,
748 gettext_noop ("# address revalidations started"), 1,
750 bc = GST_blacklist_test_allowed (&ve->address->peer,
751 ve->address->transport_name,
752 &transmit_ping_if_allowed,
757 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
763 * Find a ValidationEntry entry for the given neighbour that matches
764 * the given address and transport. If none exists, create one (but
765 * without starting any validation).
767 * @param address address to find
768 * @return validation entry matching the given specifications, NULL
769 * if we don't have an existing entry and no public key was given
771 static struct ValidationEntry *
772 find_validation_entry (const struct GNUNET_HELLO_Address *address)
774 struct ValidationEntryMatchContext vemc;
775 struct ValidationEntry *ve;
778 vemc.address = address;
779 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
781 &validation_entry_match, &vemc);
782 if (NULL != (ve = vemc.ve))
784 ve = GNUNET_new (struct ValidationEntry);
785 ve->in_use = GNUNET_SYSERR; /* not defined */
786 ve->address = GNUNET_HELLO_address_copy (address);
787 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
788 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
789 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
791 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
793 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
794 &timeout_hello_validation,
796 GNUNET_CONTAINER_multipeermap_put (validation_map,
799 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
800 publish_ve_stat_update ();
801 validation_entry_changed (ve,
802 GNUNET_TRANSPORT_VS_NEW);
808 * Iterator which adds the given address to the set of validated
811 * @param cls original HELLO message
812 * @param address the address
813 * @param expiration expiration time
814 * @return #GNUNET_OK (keep the address), could return
815 * #GNUNET_NO (delete address, but this is ignored);
816 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
819 add_valid_address (void *cls,
820 const struct GNUNET_HELLO_Address *address,
821 struct GNUNET_TIME_Absolute expiration)
823 const struct GNUNET_HELLO_Message *hello = cls;
824 struct ValidationEntry *ve;
825 struct GNUNET_PeerIdentity pid;
826 struct GNUNET_ATS_Properties prop;
828 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
829 return GNUNET_OK; /* expired */
830 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
833 return GNUNET_OK; /* invalid HELLO !? */
835 if (NULL == GST_plugins_find (address->transport_name))
837 /* might have been valid in the past, but we don't have that
838 plugin loaded right now */
842 ve = find_validation_entry (address);
843 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
845 if (NULL == ve->revalidation_task)
847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
848 "Starting revalidations for valid address `%s'\n",
849 GST_plugins_a2s (ve->address));
850 ve->next_validation = GNUNET_TIME_absolute_get();
851 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
853 validation_entry_changed (ve,
854 GNUNET_TRANSPORT_VS_UPDATE);
855 memset (&prop, 0, sizeof (prop));
856 prop.scope = ve->network;
857 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
858 if (GNUNET_YES != ve->known_to_ats)
860 ve->known_to_ats = GNUNET_YES;
861 GST_ats_add_address (address, &prop);
868 * Function called for any HELLO known to PEERINFO.
870 * @param cls unused (NULL)
871 * @param peer id of the peer, NULL for last call (during iteration,
872 * as we are monitoring, this should never happen)
873 * @param hello hello message for the peer (can be NULL)
874 * @param err_msg error message
877 process_peerinfo_hello (void *cls,
878 const struct GNUNET_PeerIdentity *peer,
879 const struct GNUNET_HELLO_Message *hello,
882 GNUNET_assert (NULL != peer);
885 if (0 == memcmp (&GST_my_identity,
887 sizeof (struct GNUNET_PeerIdentity)))
889 /* Peerinfo returned own identity, skip validation */
892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
893 "Handling HELLO for peer `%s'\n",
895 GNUNET_assert (NULL ==
896 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
903 * Start the validation subsystem.
905 * @param max_fds maximum number of fds to use
908 GST_validation_start (unsigned int max_fds)
911 * Initialization for validation throttling
913 * We have a maximum number max_fds of connections we can use for validation
914 * We monitor the number of validations in parallel and start to throttle it
915 * when doing to many validations in parallel:
916 * if (running validations < (max_fds / 2))
917 * - "fast start": run validation immediately
918 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
919 * (300 sec / ~150 == ~2 sec.) between two validations
922 validation_next = GNUNET_TIME_absolute_get();
923 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
924 validations_fast_start_threshold = (max_fds / 2);
925 validations_running = 0;
926 GNUNET_STATISTICS_set (GST_stats,
927 gettext_noop ("# validations running"),
930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
931 "Validation uses a fast start threshold of %u connections and a delay of %s\n",
932 validations_fast_start_threshold,
933 GNUNET_STRINGS_relative_time_to_string (validation_delay,
935 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
937 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
938 &process_peerinfo_hello, NULL);
943 * Stop the validation subsystem.
946 GST_validation_stop ()
948 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
949 &cleanup_validation_entry,
951 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
952 validation_map = NULL;
953 GNUNET_PEERINFO_notify_cancel (pnc);
958 * Send the given PONG to the given address.
960 * @param cls the PONG message
961 * @param valid_until is ZERO if we never validated the address,
962 * otherwise a time up to when we consider it (or was) valid
963 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
964 * is ZERO if the address is considered valid (no validation needed)
965 * otherwise a time in the future if we're currently denying re-validation
966 * @param address target address
969 multicast_pong (void *cls,
970 struct GNUNET_TIME_Absolute valid_until,
971 struct GNUNET_TIME_Absolute validation_block,
972 const struct GNUNET_HELLO_Address *address)
974 struct TransportPongMessage *pong = cls;
975 struct GNUNET_TRANSPORT_PluginFunctions *papi;
976 struct Session *session;
978 papi = GST_plugins_find (address->transport_name);
981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
982 "Plugin %s not supported, cannot send PONG\n",
983 address->transport_name);
986 GNUNET_assert (NULL != papi->send);
987 GNUNET_assert (NULL != papi->get_session);
988 session = papi->get_session(papi->cls, address);
994 GST_ats_new_session (address, session);
995 papi->send (papi->cls, session,
997 ntohs (pong->header.size),
999 ACCEPTABLE_PING_DELAY,
1001 GST_neighbours_notify_data_sent (address,
1008 * We've received a PING. If appropriate, generate a PONG.
1010 * @param sender peer sending the PING
1011 * @param hdr the PING
1012 * @param sender_address the sender address as we got it
1013 * @param session session we got the PING from
1014 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1017 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
1018 const struct GNUNET_MessageHeader *hdr,
1019 const struct GNUNET_HELLO_Address *sender_address,
1020 struct Session *session)
1022 const struct TransportPingMessage *ping;
1023 struct TransportPongMessage *pong;
1024 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1025 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
1026 struct GNUNET_TIME_Absolute *sig_cache_exp;
1028 const char *addrend;
1034 struct GNUNET_HELLO_Address address;
1036 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1038 GNUNET_break_op (0);
1039 return GNUNET_SYSERR;
1041 ping = (const struct TransportPingMessage *) hdr;
1043 memcmp (&ping->target, &GST_my_identity,
1044 sizeof (struct GNUNET_PeerIdentity)))
1046 GNUNET_STATISTICS_update (GST_stats,
1048 ("# PING message for different peer received"), 1,
1050 return GNUNET_SYSERR;
1052 GNUNET_STATISTICS_update (GST_stats,
1053 gettext_noop ("# PING messages received"), 1,
1055 addr = (const char *) &ping[1];
1056 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1057 /* peer wants to confirm that this is one of our addresses, this is what is
1058 * used for address validation */
1061 sig_cache_exp = NULL;
1063 if (len_address > 0)
1065 addrend = memchr (addr, '\0', len_address);
1066 if (NULL == addrend)
1068 GNUNET_break_op (0);
1069 return GNUNET_SYSERR;
1072 len_plugin = strlen (addr) + 1;
1073 len_address -= len_plugin;
1074 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1075 address.address = addrend;
1076 address.address_length = len_address;
1077 address.transport_name = addr;
1078 address.peer = GST_my_identity;
1080 if (NULL == address.transport_name)
1085 if (0 != strstr (address.transport_name, "_client"))
1087 plugin_name = GNUNET_strdup (address.transport_name);
1088 pos = strstr (plugin_name, "_client");
1089 GNUNET_assert (NULL != pos);
1090 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1093 plugin_name = GNUNET_strdup (address.transport_name);
1095 if (NULL == (papi = GST_plugins_find (plugin_name)))
1097 /* we don't have the plugin for this address */
1098 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1099 _("Plugin `%s' not available, cannot confirm having this address\n"),
1101 GNUNET_free (plugin_name);
1102 return GNUNET_SYSERR;
1104 GNUNET_free (plugin_name);
1106 papi->check_address (papi->cls,
1110 GNUNET_STATISTICS_update (GST_stats,
1112 ("# failed address checks during validation"), 1,
1114 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1115 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1116 GST_plugins_a2s (&address));
1117 return GNUNET_SYSERR;
1121 GNUNET_STATISTICS_update (GST_stats,
1123 ("# successful address checks during validation"), 1,
1125 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1126 "Address `%s' is one of my addresses, confirming PING\n",
1127 GST_plugins_a2s (&address));
1131 GST_hello_test_address (&address,
1135 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1136 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1137 GNUNET_i2s (sender),
1138 GST_plugins_a2s (&address));
1139 return GNUNET_SYSERR;
1144 addrend = NULL; /* make gcc happy */
1146 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1147 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1149 sig_cache = &no_address_signature;
1150 sig_cache_exp = &no_address_signature_expiration;
1153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1154 "I am `%s', sending PONG to peer `%s'\n",
1155 GNUNET_i2s_full (&GST_my_identity),
1156 GNUNET_i2s (sender));
1158 /* message with structure:
1159 * [TransportPongMessage][Transport name][Address] */
1161 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1163 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1164 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1165 pong->purpose.size =
1166 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1167 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1168 len_address + len_plugin);
1169 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1170 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1171 pong->addrlen = htonl (len_address + len_plugin);
1172 memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1173 if (len_address > 0)
1175 GNUNET_assert (NULL != addrend);
1176 memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1178 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1179 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1181 /* create / update cached sig */
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Creating PONG signature to indicate ownership.\n");
1184 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1185 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1187 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1190 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1191 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1196 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1198 pong->signature = *sig_cache;
1200 GNUNET_assert (NULL != sender_address);
1202 /* first see if the session we got this PING from can be used to transmit
1203 * a response reliably */
1210 GNUNET_assert (NULL != papi->send);
1211 GNUNET_assert (NULL != papi->get_session);
1212 if (NULL == session)
1214 session = papi->get_session (papi->cls, sender_address);
1216 if (NULL == session)
1223 ret = papi->send (papi->cls, session,
1224 (const char *) pong,
1225 ntohs (pong->header.size),
1226 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1229 GST_neighbours_notify_data_sent (sender_address,
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1237 "Transmitted PONG to `%s' via reliable mechanism\n",
1238 GNUNET_i2s (sender));
1240 GNUNET_STATISTICS_update (GST_stats,
1242 ("# PONGs unicast via reliable transport"), 1,
1248 /* no reliable method found, try transmission via all known addresses */
1249 GNUNET_STATISTICS_update (GST_stats,
1251 ("# PONGs multicast to all available addresses"), 1,
1253 GST_validation_get_addresses (sender,
1254 &multicast_pong, pong);
1261 * Validate an individual address.
1263 * @param address address we should try to validate
1266 GST_validation_handle_address (const struct GNUNET_HELLO_Address *address)
1268 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1269 struct ValidationEntry *ve;
1271 papi = GST_plugins_find (address->transport_name);
1274 /* This plugin is currently unvailable ... ignore */
1277 ve = find_validation_entry (address);
1278 if (NULL == ve->revalidation_task)
1280 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1281 "Validation process started for fresh address `%s' of %s\n",
1282 GST_plugins_a2s (ve->address),
1283 GNUNET_i2s (&ve->address->peer));
1284 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1290 * Iterator callback to go over all addresses and try to validate them
1291 * (unless blocked or already validated).
1294 * @param address the address
1295 * @param expiration expiration time
1296 * @return #GNUNET_OK (keep the address)
1299 validate_address_iterator (void *cls,
1300 const struct GNUNET_HELLO_Address *address,
1301 struct GNUNET_TIME_Absolute expiration)
1303 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 "Skipping expired address from HELLO\n");
1307 return GNUNET_OK; /* expired */
1309 GST_validation_handle_address (address);
1315 * Add the validated peer address to the HELLO.
1317 * @param cls the `struct ValidationEntry *` with the validated address
1318 * @param max space in @a buf
1319 * @param buf where to add the address
1320 * @return number of bytes written, #GNUNET_SYSERR to signal the
1321 * end of the iteration.
1324 add_valid_peer_address (void *cls,
1328 struct ValidationEntry *ve = cls;
1330 if (GNUNET_YES == ve->copied)
1331 return GNUNET_SYSERR; /* Done */
1332 ve->copied = GNUNET_YES;
1333 return GNUNET_HELLO_add_address (ve->address,
1341 * We've received a PONG. Check if it matches a pending PING and
1342 * mark the respective address as confirmed.
1344 * @param sender peer sending the PONG
1345 * @param hdr the PONG
1346 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1349 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1350 const struct GNUNET_MessageHeader *hdr)
1352 const struct TransportPongMessage *pong;
1353 struct ValidationEntry *ve;
1359 struct GNUNET_HELLO_Message *hello;
1360 struct GNUNET_HELLO_Address address;
1364 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1366 GNUNET_break_op (0);
1367 return GNUNET_SYSERR;
1369 GNUNET_STATISTICS_update (GST_stats,
1370 gettext_noop ("# PONG messages received"), 1,
1373 /* message with structure:
1374 * [TransportPongMessage][Transport name][Address] */
1376 pong = (const struct TransportPongMessage *) hdr;
1377 tname = (const char *) &pong[1];
1378 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1379 addr = memchr (tname, '\0', size);
1382 GNUNET_break_op (0);
1383 return GNUNET_SYSERR;
1386 slen = strlen (tname) + 1;
1387 addrlen = size - slen;
1389 if (NULL == GST_plugins_find (tname))
1391 /* we got the PONG, but the transport plugin specified in it
1392 is not supported by this peer, so this cannot be a good
1394 GNUNET_break_op (0);
1398 address.peer = *sender;
1399 address.address = addr;
1400 address.address_length = addrlen;
1401 address.transport_name = tname;
1402 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1403 ve = find_validation_entry (&address);
1404 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1406 GNUNET_STATISTICS_update (GST_stats,
1408 ("# PONGs dropped, no matching pending validation"),
1412 /* now check that PONG is well-formed */
1413 if (0 != memcmp (&ve->address->peer,
1415 sizeof (struct GNUNET_PeerIdentity)))
1417 GNUNET_break_op (0);
1418 return GNUNET_SYSERR;
1421 GNUNET_TIME_absolute_get_remaining
1422 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1424 GNUNET_STATISTICS_update (GST_stats,
1426 ("# PONGs dropped, signature expired"), 1,
1428 return GNUNET_SYSERR;
1431 sig_res = GNUNET_SYSERR;
1432 do_verify = GNUNET_YES;
1433 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1435 /* We have a cached and valid signature for this peer,
1436 * try to compare instead of verify */
1437 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1439 /* signatures are identical, we can skip verification */
1440 sig_res = GNUNET_OK;
1441 do_verify = GNUNET_NO;
1445 sig_res = GNUNET_SYSERR;
1446 /* signatures do not match, we have to verify */
1450 if (GNUNET_YES == do_verify)
1452 /* Do expensive verification */
1453 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1454 &pong->purpose, &pong->signature,
1455 &ve->address->peer.public_key);
1456 if (sig_res == GNUNET_SYSERR)
1458 GNUNET_break_op (0);
1459 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1460 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1462 GST_plugins_a2s (ve->address),
1463 GNUNET_i2s (sender));
1466 if (sig_res == GNUNET_SYSERR)
1468 GNUNET_break_op (0);
1469 return GNUNET_SYSERR;
1472 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1473 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1474 GNUNET_i2s (sender),
1476 GST_plugins_a2s (ve->address));
1477 GNUNET_STATISTICS_update (GST_stats,
1478 gettext_noop ("# validations succeeded"),
1481 /* validity achieved, remember it! */
1482 ve->expecting_pong = GNUNET_NO;
1483 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1484 ve->pong_sig_cache = pong->signature;
1485 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1486 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1488 if (GNUNET_YES == ve->known_to_ats)
1490 GST_ats_update_delay (ve->address,
1491 GNUNET_TIME_relative_divide (ve->latency, 2));
1495 struct GNUNET_ATS_Properties prop;
1497 memset (&prop, 0, sizeof (prop));
1498 prop.scope = ve->network;
1499 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
1500 ve->known_to_ats = GNUNET_YES;
1501 GST_ats_add_address (ve->address, &prop);
1504 if (validations_running > 0)
1506 validations_running--;
1507 GNUNET_STATISTICS_set (GST_stats,
1508 gettext_noop ("# validations running"),
1509 validations_running,
1511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1512 "Validation finished, %u validation processes running\n",
1513 validations_running);
1520 /* Notify about new validity */
1521 validation_entry_changed (ve,
1522 GNUNET_TRANSPORT_VS_UPDATE);
1524 /* build HELLO to store in PEERINFO */
1525 ve->copied = GNUNET_NO;
1526 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1527 &add_valid_peer_address, ve,
1529 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1530 GNUNET_free (hello);
1536 * We've received a HELLO, check which addresses are new and trigger
1539 * @param hello the HELLO we received
1540 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1543 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1545 const struct GNUNET_HELLO_Message *hm =
1546 (const struct GNUNET_HELLO_Message *) hello;
1547 struct GNUNET_PeerIdentity pid;
1548 struct GNUNET_HELLO_Message *h;
1551 friend = GNUNET_HELLO_is_friend_only (hm);
1552 if ( ( (GNUNET_YES != friend) &&
1553 (GNUNET_NO != friend) ) ||
1554 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1556 /* malformed HELLO */
1557 GNUNET_break_op (0);
1558 return GNUNET_SYSERR;
1561 memcmp (&GST_my_identity,
1563 sizeof (struct GNUNET_PeerIdentity)))
1565 /* got our own HELLO, how boring */
1569 GNUNET_CONTAINER_multipeermap_contains (validation_map,
1572 /* Add peer identity without addresses to peerinfo service */
1573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1574 "Adding HELLO without addresses for peer `%s'\n",
1576 h = GNUNET_HELLO_create (&pid.public_key, NULL, NULL, friend);
1577 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1584 "Validation received HELLO message for peer `%s' with size %u, checking for new addresses\n",
1586 ntohs (hello->size));
1588 GNUNET_assert (NULL ==
1589 GNUNET_HELLO_iterate_addresses (hm,
1591 &validate_address_iterator,
1598 * Closure for #iterate_addresses().
1600 struct IteratorContext
1603 * Function to call on each address.
1605 GST_ValidationAddressCallback cb;
1608 * Closure for @e cb.
1616 * Call the callback in the closure for each validation entry.
1618 * @param cls the `struct IteratorContext`
1619 * @param key the peer's identity
1620 * @param value the `struct ValidationEntry`
1621 * @return #GNUNET_OK (continue to iterate)
1624 iterate_addresses (void *cls,
1625 const struct GNUNET_PeerIdentity *key,
1628 struct IteratorContext *ic = cls;
1629 struct ValidationEntry *ve = value;
1633 ve->revalidation_block,
1640 * Call the given function for each address for the given target.
1641 * Can either give a snapshot (synchronous API) or be continuous.
1643 * @param target peer information is requested for
1644 * @param cb function to call; will not be called after this function returns
1645 * @param cb_cls closure for @a cb
1648 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1649 GST_ValidationAddressCallback cb,
1652 struct IteratorContext ic;
1656 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1658 &iterate_addresses, &ic);
1663 * Update if we are using an address for a connection actively right now.
1664 * Based on this, the validation module will measure latency for the
1665 * address more or less often.
1667 * @param address the address that we are now using (or not)
1668 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1669 * #GNUNET_NO if we are no longer using the address for a connection
1672 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1675 struct ValidationEntry *ve;
1677 if (GNUNET_HELLO_address_check_option (address,
1678 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1679 return; /* ignore inbound for validation */
1680 if (NULL == GST_plugins_find (address->transport_name))
1682 /* How can we use an address for which we don't have the plugin? */
1686 ve = find_validation_entry (address);
1692 if (in_use == ve->in_use)
1694 ve->in_use = in_use;
1695 if (GNUNET_YES == in_use)
1697 /* from now on, higher frequeny, so reschedule now */
1698 if (NULL != ve->revalidation_task)
1699 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1700 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address,
1707 * Closure for the validation_entries_iterate function.
1709 struct ValidationIteratorContext
1712 * Function to call on each validation entry
1714 GST_ValidationChangedCallback cb;
1717 * Closure for @e cb.
1724 * Function called on each entry in the validation map.
1725 * Passes the information from the validation entry to
1726 * the callback given in the closure.
1728 * @param cls the `struct ValidationIteratorContext`
1729 * @param key peer this is about
1730 * @param value the `struct ValidationEntry`
1731 * @return #GNUNET_OK (continue to iterate)
1734 validation_entries_iterate (void *cls,
1735 const struct GNUNET_PeerIdentity *key,
1738 struct ValidationIteratorContext *ic = cls;
1739 struct ValidationEntry *ve = value;
1741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1742 "Notifying about validation entry for peer `%s' address `%s' \n",
1743 GNUNET_i2s (&ve->address->peer),
1744 GST_plugins_a2s (ve->address));
1749 ve->next_validation,
1756 * Iterate over all iteration entries
1758 * @param cb function to call
1759 * @param cb_cls closure for @a cb
1762 GST_validation_iterate (GST_ValidationChangedCallback cb,
1765 struct ValidationIteratorContext ic;
1767 if (NULL == validation_map)
1768 return; /* can happen during shutdown */
1771 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1772 &validation_entries_iterate,
1776 /* end of file gnunet-service-transport_validation.c */