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,
417 GNUNET_TRANSPORT_VS_REMOVE);
421 GST_blacklist_test_cancel (ve->bc);
424 GNUNET_break (GNUNET_OK ==
425 GNUNET_CONTAINER_multipeermap_remove (validation_map,
428 publish_ve_stat_update ();
429 if (GNUNET_YES == ve->known_to_ats)
431 GST_ats_expire_address (ve->address);
432 ve->known_to_ats = GNUNET_NO;
434 GNUNET_HELLO_address_free (ve->address);
435 if (NULL != ve->timeout_task)
437 GNUNET_SCHEDULER_cancel (ve->timeout_task);
438 ve->timeout_task = NULL;
440 if (NULL != ve->revalidation_task)
442 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
443 ve->revalidation_task = NULL;
445 if ( (GNUNET_YES == ve->expecting_pong) &&
446 (validations_running > 0) )
448 validations_running--;
449 GNUNET_STATISTICS_set (GST_stats,
450 gettext_noop ("# validations running"),
460 * Address validation cleanup task. Assesses if the record is no
461 * longer valid and then possibly triggers its removal.
463 * @param cls the `struct ValidationEntry`
464 * @param tc scheduler context (unused)
467 timeout_hello_validation (void *cls,
468 const struct GNUNET_SCHEDULER_TaskContext *tc)
470 struct ValidationEntry *ve = cls;
471 struct GNUNET_TIME_Absolute max;
472 struct GNUNET_TIME_Relative left;
474 ve->timeout_task = NULL;
475 /* For valid addresses, we want to wait until the expire;
476 for addresses under PING validation, we want to wait
477 until we give up on the PING */
478 max = GNUNET_TIME_absolute_max (ve->valid_until,
479 ve->revalidation_block);
480 left = GNUNET_TIME_absolute_get_remaining (max);
481 if (left.rel_value_us > 0)
483 /* We should wait a bit longer. This happens when
484 address lifetimes are extended due to successful
487 GNUNET_SCHEDULER_add_delayed (left,
488 &timeout_hello_validation,
492 GNUNET_STATISTICS_update (GST_stats,
493 gettext_noop ("# address records discarded (timeout)"),
496 cleanup_validation_entry (NULL,
503 * Function called with the result from blacklisting.
504 * Send a PING to the other peer if a communication is allowed.
506 * @param cls our `struct ValidationEntry`
507 * @param pid identity of the other peer
508 * @param result #GNUNET_OK if the connection is allowed, #GNUNET_NO if not
511 transmit_ping_if_allowed (void *cls,
512 const struct GNUNET_PeerIdentity *pid,
515 struct ValidationEntry *ve = cls;
516 struct TransportPingMessage ping;
517 struct GNUNET_TRANSPORT_PluginFunctions *papi;
518 struct GNUNET_TIME_Absolute next;
519 const struct GNUNET_MessageHeader *hello;
524 struct Session *session;
527 if (GNUNET_NO == result)
529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
530 "Blacklist denies sending PING to `%s' `%s' `%s'\n",
532 GST_plugins_a2s (ve->address),
533 ve->address->transport_name);
534 GNUNET_STATISTICS_update (GST_stats,
535 gettext_noop ("# address records discarded (blacklist)"),
538 cleanup_validation_entry (NULL,
543 hello = GST_hello_get ();
544 GNUNET_assert (NULL != hello);
545 slen = strlen (ve->address->transport_name) + 1;
546 hsize = ntohs (hello->size);
547 tsize = sizeof (struct TransportPingMessage) +
548 ve->address->address_length + slen + hsize;
551 htons (sizeof (struct TransportPingMessage) +
552 ve->address->address_length + slen);
553 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
554 ping.challenge = htonl (ve->challenge);
557 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
562 sizeof (struct TransportPingMessage) + ve->address->address_length +
566 char message_buf[tsize] GNUNET_ALIGN;
571 memcpy (&message_buf[hsize],
573 sizeof (struct TransportPingMessage));
574 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
575 ve->address->transport_name,
577 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
578 ve->address->address,
579 ve->address->address_length);
580 papi = GST_plugins_find (ve->address->transport_name);
581 GNUNET_assert (NULL != papi);
582 session = papi->get_session (papi->cls,
586 /* Could not get a valid session */
587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
588 "Failed to get session to send PING to `%s' at `%s'\n",
590 GST_plugins_a2s (ve->address));
594 ret = papi->send (papi->cls, session,
597 ACCEPTABLE_PING_DELAY,
601 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
602 "Failed to send PING to `%s' at `%s'\n",
604 GST_plugins_a2s (ve->address));
607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
608 "Transmitted plain PING to `%s' `%s' `%s'\n",
610 GST_plugins_a2s (ve->address),
611 ve->address->transport_name);
612 ve->network = papi->get_network (papi->cls,
614 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != ve->network);
615 GST_neighbours_notify_data_sent (ve->address,
618 next = GNUNET_TIME_relative_to_absolute (validation_delay);
619 validation_next = GNUNET_TIME_absolute_max (next,
621 ve->send_time = GNUNET_TIME_absolute_get ();
622 GNUNET_STATISTICS_update (GST_stats,
623 gettext_noop ("# PINGs for address validation sent"),
626 ve->expecting_pong = GNUNET_YES;
627 validations_running++;
628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
629 "Validation started, %u validation processes running\n",
630 validations_running);
631 GNUNET_STATISTICS_set (GST_stats,
632 gettext_noop ("# validations running"),
635 /* Notify about PING sent */
636 validation_entry_changed (ve,
637 GNUNET_TRANSPORT_VS_UPDATE);
644 * Do address validation again to keep address valid.
646 * @param cls the `struct ValidationEntry`
647 * @param tc scheduler context (unused)
650 revalidate_address (void *cls,
651 const struct GNUNET_SCHEDULER_TaskContext *tc)
653 struct ValidationEntry *ve = cls;
654 struct GNUNET_TIME_Relative canonical_delay;
655 struct GNUNET_TIME_Relative delay;
656 struct GNUNET_TIME_Relative blocked_for;
657 struct GST_BlacklistCheck *bc;
660 ve->revalidation_task = NULL;
661 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
662 /* Considering current connectivity situation, what is the maximum
663 block period permitted? */
664 if (GNUNET_YES == ve->in_use)
665 canonical_delay = CONNECTED_PING_FREQUENCY;
666 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
667 canonical_delay = VALIDATED_PING_FREQUENCY;
669 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
670 /* Use delay that is MIN of original delay and possibly adjusted
671 new maximum delay (which may be lower); the real delay
672 is originally randomized between "canonical_delay" and "2 * canonical_delay",
673 so continue to permit that window for the operation. */
674 delay = GNUNET_TIME_relative_min (delay,
675 GNUNET_TIME_relative_multiply (canonical_delay,
677 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
678 if (delay.rel_value_us > 0)
680 /* should wait a bit longer */
681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
682 "Waiting for %s longer before (re)validating address `%s'\n",
683 GNUNET_STRINGS_relative_time_to_string (delay,
685 GST_plugins_a2s (ve->address));
686 ve->revalidation_task =
687 GNUNET_SCHEDULER_add_delayed (delay,
688 &revalidate_address, ve);
689 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
692 /* check if globally we have too many active validations at a
693 too high rate, if so, delay ours */
694 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
695 if ( (validations_running > validations_fast_start_threshold) &&
696 (blocked_for.rel_value_us > 0) )
698 /* Validations are blocked, have to wait for blocked_for time */
699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
700 "Validations blocked for another %s, delaying validating address `%s'\n",
701 GNUNET_STRINGS_relative_time_to_string (blocked_for,
703 GST_plugins_a2s (ve->address));
704 GNUNET_STATISTICS_update (GST_stats,
705 gettext_noop ("# validations delayed by global throttle"),
708 ve->revalidation_task =
709 GNUNET_SCHEDULER_add_delayed (blocked_for,
712 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
716 /* We are good to go; remember to not go again for `canonical_delay` time;
717 add up to `canonical_delay` to randomize start time */
718 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
719 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
721 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
722 canonical_delay.rel_value_us);
724 delay = GNUNET_TIME_relative_add (canonical_delay,
725 GNUNET_TIME_relative_multiply
726 (GNUNET_TIME_UNIT_MICROSECONDS,
729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
730 "Validating now, next scheduled for %s, now validating address `%s'\n",
731 GNUNET_STRINGS_relative_time_to_string (blocked_for,
733 GST_plugins_a2s (ve->address));
734 ve->revalidation_task =
735 GNUNET_SCHEDULER_add_delayed (delay,
738 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
740 /* start PINGing by checking blacklist */
741 GNUNET_STATISTICS_update (GST_stats,
742 gettext_noop ("# address revalidations started"), 1,
744 bc = GST_blacklist_test_allowed (&ve->address->peer,
745 ve->address->transport_name,
746 &transmit_ping_if_allowed, ve);
748 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
754 * Find a ValidationEntry entry for the given neighbour that matches
755 * the given address and transport. If none exists, create one (but
756 * without starting any validation).
758 * @param address address to find
759 * @return validation entry matching the given specifications, NULL
760 * if we don't have an existing entry and no public key was given
762 static struct ValidationEntry *
763 find_validation_entry (const struct GNUNET_HELLO_Address *address)
765 struct ValidationEntryMatchContext vemc;
766 struct ValidationEntry *ve;
769 vemc.address = address;
770 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
772 &validation_entry_match, &vemc);
773 if (NULL != (ve = vemc.ve))
775 ve = GNUNET_new (struct ValidationEntry);
776 ve->in_use = GNUNET_SYSERR; /* not defined */
777 ve->address = GNUNET_HELLO_address_copy (address);
778 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
779 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
780 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
782 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
784 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
785 &timeout_hello_validation,
787 GNUNET_CONTAINER_multipeermap_put (validation_map,
790 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
791 publish_ve_stat_update ();
792 validation_entry_changed (ve,
793 GNUNET_TRANSPORT_VS_NEW);
799 * Iterator which adds the given address to the set of validated
802 * @param cls original HELLO message
803 * @param address the address
804 * @param expiration expiration time
805 * @return #GNUNET_OK (keep the address), could return
806 * #GNUNET_NO (delete address, but this is ignored);
807 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
810 add_valid_address (void *cls,
811 const struct GNUNET_HELLO_Address *address,
812 struct GNUNET_TIME_Absolute expiration)
814 const struct GNUNET_HELLO_Message *hello = cls;
815 struct ValidationEntry *ve;
816 struct GNUNET_PeerIdentity pid;
817 struct GNUNET_ATS_Properties prop;
819 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
820 return GNUNET_OK; /* expired */
821 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
824 return GNUNET_OK; /* invalid HELLO !? */
826 if (NULL == GST_plugins_find (address->transport_name))
828 /* might have been valid in the past, but we don't have that
829 plugin loaded right now */
833 ve = find_validation_entry (address);
834 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
836 if (NULL == ve->revalidation_task)
838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
839 "Starting revalidations for valid address `%s'\n",
840 GST_plugins_a2s (ve->address));
841 ve->next_validation = GNUNET_TIME_absolute_get();
842 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
844 validation_entry_changed (ve,
845 GNUNET_TRANSPORT_VS_UPDATE);
846 memset (&prop, 0, sizeof (prop));
847 prop.scope = ve->network;
848 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
849 if (GNUNET_YES != ve->known_to_ats)
851 ve->known_to_ats = GNUNET_YES;
852 GST_ats_add_address (address, &prop);
859 * Function called for any HELLO known to PEERINFO.
861 * @param cls unused (NULL)
862 * @param peer id of the peer, NULL for last call (during iteration,
863 * as we are monitoring, this should never happen)
864 * @param hello hello message for the peer (can be NULL)
865 * @param err_msg error message
868 process_peerinfo_hello (void *cls,
869 const struct GNUNET_PeerIdentity *peer,
870 const struct GNUNET_HELLO_Message *hello,
873 GNUNET_assert (NULL != peer);
876 if (0 == memcmp (&GST_my_identity,
878 sizeof (struct GNUNET_PeerIdentity)))
880 /* Peerinfo returned own identity, skip validation */
883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
884 "Handling HELLO for peer `%s'\n",
886 GNUNET_assert (NULL ==
887 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
894 * Start the validation subsystem.
896 * @param max_fds maximum number of fds to use
899 GST_validation_start (unsigned int max_fds)
902 * Initialization for validation throttling
904 * We have a maximum number max_fds of connections we can use for validation
905 * We monitor the number of validations in parallel and start to throttle it
906 * when doing to many validations in parallel:
907 * if (running validations < (max_fds / 2))
908 * - "fast start": run validation immediately
909 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
910 * (300 sec / ~150 == ~2 sec.) between two validations
913 validation_next = GNUNET_TIME_absolute_get();
914 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
915 validations_fast_start_threshold = (max_fds / 2);
916 validations_running = 0;
917 GNUNET_STATISTICS_set (GST_stats,
918 gettext_noop ("# validations running"),
921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
922 "Validation uses a fast start threshold of %u connections and a delay of %s\n",
923 validations_fast_start_threshold,
924 GNUNET_STRINGS_relative_time_to_string (validation_delay,
926 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
928 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
929 &process_peerinfo_hello, NULL);
934 * Stop the validation subsystem.
937 GST_validation_stop ()
939 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
940 &cleanup_validation_entry,
942 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
943 validation_map = NULL;
944 GNUNET_PEERINFO_notify_cancel (pnc);
949 * Send the given PONG to the given address.
951 * @param cls the PONG message
952 * @param valid_until is ZERO if we never validated the address,
953 * otherwise a time up to when we consider it (or was) valid
954 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
955 * is ZERO if the address is considered valid (no validation needed)
956 * otherwise a time in the future if we're currently denying re-validation
957 * @param address target address
960 multicast_pong (void *cls,
961 struct GNUNET_TIME_Absolute valid_until,
962 struct GNUNET_TIME_Absolute validation_block,
963 const struct GNUNET_HELLO_Address *address)
965 struct TransportPongMessage *pong = cls;
966 struct GNUNET_TRANSPORT_PluginFunctions *papi;
967 struct Session *session;
969 papi = GST_plugins_find (address->transport_name);
972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
973 "Plugin %s not supported, cannot send PONG\n",
974 address->transport_name);
977 GNUNET_assert (NULL != papi->send);
978 GNUNET_assert (NULL != papi->get_session);
979 session = papi->get_session(papi->cls, address);
985 GST_ats_new_session (address, session);
986 papi->send (papi->cls, session,
988 ntohs (pong->header.size),
990 ACCEPTABLE_PING_DELAY,
992 GST_neighbours_notify_data_sent (address,
999 * We've received a PING. If appropriate, generate a PONG.
1001 * @param sender peer sending the PING
1002 * @param hdr the PING
1003 * @param sender_address the sender address as we got it
1004 * @param session session we got the PING from
1005 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1008 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
1009 const struct GNUNET_MessageHeader *hdr,
1010 const struct GNUNET_HELLO_Address *sender_address,
1011 struct Session *session)
1013 const struct TransportPingMessage *ping;
1014 struct TransportPongMessage *pong;
1015 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1016 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
1017 struct GNUNET_TIME_Absolute *sig_cache_exp;
1019 const char *addrend;
1025 struct GNUNET_HELLO_Address address;
1027 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1029 GNUNET_break_op (0);
1030 return GNUNET_SYSERR;
1032 ping = (const struct TransportPingMessage *) hdr;
1034 memcmp (&ping->target, &GST_my_identity,
1035 sizeof (struct GNUNET_PeerIdentity)))
1037 GNUNET_STATISTICS_update (GST_stats,
1039 ("# PING message for different peer received"), 1,
1041 return GNUNET_SYSERR;
1043 GNUNET_STATISTICS_update (GST_stats,
1044 gettext_noop ("# PING messages received"), 1,
1046 addr = (const char *) &ping[1];
1047 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1048 /* peer wants to confirm that this is one of our addresses, this is what is
1049 * used for address validation */
1052 sig_cache_exp = NULL;
1054 if (len_address > 0)
1056 addrend = memchr (addr, '\0', len_address);
1057 if (NULL == addrend)
1059 GNUNET_break_op (0);
1060 return GNUNET_SYSERR;
1063 len_plugin = strlen (addr) + 1;
1064 len_address -= len_plugin;
1065 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1066 address.address = addrend;
1067 address.address_length = len_address;
1068 address.transport_name = addr;
1069 address.peer = GST_my_identity;
1071 if (NULL == address.transport_name)
1076 if (0 != strstr (address.transport_name, "_client"))
1078 plugin_name = GNUNET_strdup (address.transport_name);
1079 pos = strstr (plugin_name, "_client");
1080 GNUNET_assert (NULL != pos);
1081 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1084 plugin_name = GNUNET_strdup (address.transport_name);
1086 if (NULL == (papi = GST_plugins_find (plugin_name)))
1088 /* we don't have the plugin for this address */
1089 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1090 _("Plugin `%s' not available, cannot confirm having this address\n"),
1092 GNUNET_free (plugin_name);
1093 return GNUNET_SYSERR;
1095 GNUNET_free (plugin_name);
1097 papi->check_address (papi->cls,
1101 GNUNET_STATISTICS_update (GST_stats,
1103 ("# failed address checks during validation"), 1,
1105 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1106 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1107 GST_plugins_a2s (&address));
1108 return GNUNET_SYSERR;
1112 GNUNET_STATISTICS_update (GST_stats,
1114 ("# successful address checks during validation"), 1,
1116 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1117 "Address `%s' is one of my addresses, confirming PING\n",
1118 GST_plugins_a2s (&address));
1122 GST_hello_test_address (&address,
1126 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1127 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1128 GNUNET_i2s (sender),
1129 GST_plugins_a2s (&address));
1130 return GNUNET_SYSERR;
1135 addrend = NULL; /* make gcc happy */
1137 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1138 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1140 sig_cache = &no_address_signature;
1141 sig_cache_exp = &no_address_signature_expiration;
1144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1145 "I am `%s', sending PONG to peer `%s'\n",
1146 GNUNET_i2s_full (&GST_my_identity),
1147 GNUNET_i2s (sender));
1149 /* message with structure:
1150 * [TransportPongMessage][Transport name][Address] */
1152 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1154 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1155 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1156 pong->purpose.size =
1157 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1158 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1159 len_address + len_plugin);
1160 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1161 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1162 pong->addrlen = htonl (len_address + len_plugin);
1163 memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1164 if (len_address > 0)
1166 GNUNET_assert (NULL != addrend);
1167 memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1169 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1170 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1172 /* create / update cached sig */
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Creating PONG signature to indicate ownership.\n");
1175 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1176 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1178 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1181 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1182 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1187 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1189 pong->signature = *sig_cache;
1191 GNUNET_assert (NULL != sender_address);
1193 /* first see if the session we got this PING from can be used to transmit
1194 * a response reliably */
1201 GNUNET_assert (NULL != papi->send);
1202 GNUNET_assert (NULL != papi->get_session);
1203 if (NULL == session)
1205 session = papi->get_session (papi->cls, sender_address);
1207 if (NULL == session)
1214 ret = papi->send (papi->cls, session,
1215 (const char *) pong,
1216 ntohs (pong->header.size),
1217 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1220 GST_neighbours_notify_data_sent (sender_address,
1227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1228 "Transmitted PONG to `%s' via reliable mechanism\n",
1229 GNUNET_i2s (sender));
1231 GNUNET_STATISTICS_update (GST_stats,
1233 ("# PONGs unicast via reliable transport"), 1,
1239 /* no reliable method found, try transmission via all known addresses */
1240 GNUNET_STATISTICS_update (GST_stats,
1242 ("# PONGs multicast to all available addresses"), 1,
1244 GST_validation_get_addresses (sender,
1245 &multicast_pong, pong);
1252 * Validate an individual address.
1254 * @param address address we should try to validate
1257 GST_validation_handle_address (const struct GNUNET_HELLO_Address *address)
1259 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1260 struct ValidationEntry *ve;
1262 papi = GST_plugins_find (address->transport_name);
1265 /* This plugin is currently unvailable ... ignore */
1268 ve = find_validation_entry (address);
1269 if (NULL == ve->revalidation_task)
1271 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1272 "Validation process started for fresh address `%s' of %s\n",
1273 GST_plugins_a2s (ve->address),
1274 GNUNET_i2s (&ve->address->peer));
1275 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1281 * Iterator callback to go over all addresses and try to validate them
1282 * (unless blocked or already validated).
1285 * @param address the address
1286 * @param expiration expiration time
1287 * @return #GNUNET_OK (keep the address)
1290 validate_address_iterator (void *cls,
1291 const struct GNUNET_HELLO_Address *address,
1292 struct GNUNET_TIME_Absolute expiration)
1294 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1297 "Skipping expired address from HELLO\n");
1298 return GNUNET_OK; /* expired */
1300 GST_validation_handle_address (address);
1306 * Add the validated peer address to the HELLO.
1308 * @param cls the `struct ValidationEntry *` with the validated address
1309 * @param max space in @a buf
1310 * @param buf where to add the address
1311 * @return number of bytes written, #GNUNET_SYSERR to signal the
1312 * end of the iteration.
1315 add_valid_peer_address (void *cls,
1319 struct ValidationEntry *ve = cls;
1321 if (GNUNET_YES == ve->copied)
1322 return GNUNET_SYSERR; /* Done */
1323 ve->copied = GNUNET_YES;
1324 return GNUNET_HELLO_add_address (ve->address,
1332 * We've received a PONG. Check if it matches a pending PING and
1333 * mark the respective address as confirmed.
1335 * @param sender peer sending the PONG
1336 * @param hdr the PONG
1337 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1340 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1341 const struct GNUNET_MessageHeader *hdr)
1343 const struct TransportPongMessage *pong;
1344 struct ValidationEntry *ve;
1350 struct GNUNET_HELLO_Message *hello;
1351 struct GNUNET_HELLO_Address address;
1355 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1357 GNUNET_break_op (0);
1358 return GNUNET_SYSERR;
1360 GNUNET_STATISTICS_update (GST_stats,
1361 gettext_noop ("# PONG messages received"), 1,
1364 /* message with structure:
1365 * [TransportPongMessage][Transport name][Address] */
1367 pong = (const struct TransportPongMessage *) hdr;
1368 tname = (const char *) &pong[1];
1369 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1370 addr = memchr (tname, '\0', size);
1373 GNUNET_break_op (0);
1374 return GNUNET_SYSERR;
1377 slen = strlen (tname) + 1;
1378 addrlen = size - slen;
1380 if (NULL == GST_plugins_find (tname))
1382 /* we got the PONG, but the transport plugin specified in it
1383 is not supported by this peer, so this cannot be a good
1385 GNUNET_break_op (0);
1389 address.peer = *sender;
1390 address.address = addr;
1391 address.address_length = addrlen;
1392 address.transport_name = tname;
1393 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1394 ve = find_validation_entry (&address);
1395 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1397 GNUNET_STATISTICS_update (GST_stats,
1399 ("# PONGs dropped, no matching pending validation"),
1403 /* now check that PONG is well-formed */
1404 if (0 != memcmp (&ve->address->peer,
1406 sizeof (struct GNUNET_PeerIdentity)))
1408 GNUNET_break_op (0);
1409 return GNUNET_SYSERR;
1412 GNUNET_TIME_absolute_get_remaining
1413 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1415 GNUNET_STATISTICS_update (GST_stats,
1417 ("# PONGs dropped, signature expired"), 1,
1419 return GNUNET_SYSERR;
1422 sig_res = GNUNET_SYSERR;
1423 do_verify = GNUNET_YES;
1424 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1426 /* We have a cached and valid signature for this peer,
1427 * try to compare instead of verify */
1428 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1430 /* signatures are identical, we can skip verification */
1431 sig_res = GNUNET_OK;
1432 do_verify = GNUNET_NO;
1436 sig_res = GNUNET_SYSERR;
1437 /* signatures do not match, we have to verify */
1441 if (GNUNET_YES == do_verify)
1443 /* Do expensive verification */
1444 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1445 &pong->purpose, &pong->signature,
1446 &ve->address->peer.public_key);
1447 if (sig_res == GNUNET_SYSERR)
1449 GNUNET_break_op (0);
1450 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1451 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1453 GST_plugins_a2s (ve->address),
1454 GNUNET_i2s (sender));
1457 if (sig_res == GNUNET_SYSERR)
1459 GNUNET_break_op (0);
1460 return GNUNET_SYSERR;
1463 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1464 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1465 GNUNET_i2s (sender),
1467 GST_plugins_a2s (ve->address));
1468 GNUNET_STATISTICS_update (GST_stats,
1469 gettext_noop ("# validations succeeded"),
1472 /* validity achieved, remember it! */
1473 ve->expecting_pong = GNUNET_NO;
1474 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1475 ve->pong_sig_cache = pong->signature;
1476 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1477 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1479 if (GNUNET_YES == ve->known_to_ats)
1481 GST_ats_update_delay (ve->address,
1482 GNUNET_TIME_relative_divide (ve->latency, 2));
1486 struct GNUNET_ATS_Properties prop;
1488 memset (&prop, 0, sizeof (prop));
1489 prop.scope = ve->network;
1490 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
1491 ve->known_to_ats = GNUNET_YES;
1492 GST_ats_add_address (ve->address, &prop);
1495 if (validations_running > 0)
1497 validations_running--;
1498 GNUNET_STATISTICS_set (GST_stats,
1499 gettext_noop ("# validations running"),
1500 validations_running,
1502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1503 "Validation finished, %u validation processes running\n",
1504 validations_running);
1511 /* Notify about new validity */
1512 validation_entry_changed (ve,
1513 GNUNET_TRANSPORT_VS_UPDATE);
1515 /* build HELLO to store in PEERINFO */
1516 ve->copied = GNUNET_NO;
1517 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1518 &add_valid_peer_address, ve,
1520 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1521 GNUNET_free (hello);
1527 * We've received a HELLO, check which addresses are new and trigger
1530 * @param hello the HELLO we received
1531 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1534 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1536 const struct GNUNET_HELLO_Message *hm =
1537 (const struct GNUNET_HELLO_Message *) hello;
1538 struct GNUNET_PeerIdentity pid;
1539 struct GNUNET_HELLO_Message *h;
1542 friend = GNUNET_HELLO_is_friend_only (hm);
1543 if ( ( (GNUNET_YES != friend) &&
1544 (GNUNET_NO != friend) ) ||
1545 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1547 /* malformed HELLO */
1548 GNUNET_break_op (0);
1549 return GNUNET_SYSERR;
1552 memcmp (&GST_my_identity,
1554 sizeof (struct GNUNET_PeerIdentity)))
1556 /* got our own HELLO, how boring */
1560 GNUNET_CONTAINER_multipeermap_contains (validation_map,
1563 /* Add peer identity without addresses to peerinfo service */
1564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1565 "Adding HELLO without addresses for peer `%s'\n",
1567 h = GNUNET_HELLO_create (&pid.public_key, NULL, NULL, friend);
1568 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1575 "Validation received HELLO message for peer `%s' with size %u, checking for new addresses\n",
1577 ntohs (hello->size));
1579 GNUNET_assert (NULL ==
1580 GNUNET_HELLO_iterate_addresses (hm,
1582 &validate_address_iterator,
1589 * Closure for #iterate_addresses().
1591 struct IteratorContext
1594 * Function to call on each address.
1596 GST_ValidationAddressCallback cb;
1599 * Closure for @e cb.
1607 * Call the callback in the closure for each validation entry.
1609 * @param cls the `struct IteratorContext`
1610 * @param key the peer's identity
1611 * @param value the `struct ValidationEntry`
1612 * @return #GNUNET_OK (continue to iterate)
1615 iterate_addresses (void *cls,
1616 const struct GNUNET_PeerIdentity *key,
1619 struct IteratorContext *ic = cls;
1620 struct ValidationEntry *ve = value;
1624 ve->revalidation_block,
1631 * Call the given function for each address for the given target.
1632 * Can either give a snapshot (synchronous API) or be continuous.
1634 * @param target peer information is requested for
1635 * @param cb function to call; will not be called after this function returns
1636 * @param cb_cls closure for @a cb
1639 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1640 GST_ValidationAddressCallback cb,
1643 struct IteratorContext ic;
1647 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1649 &iterate_addresses, &ic);
1654 * Update if we are using an address for a connection actively right now.
1655 * Based on this, the validation module will measure latency for the
1656 * address more or less often.
1658 * @param address the address that we are now using (or not)
1659 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1660 * #GNUNET_NO if we are no longer using the address for a connection
1663 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1666 struct ValidationEntry *ve;
1668 if (GNUNET_HELLO_address_check_option (address,
1669 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1670 return; /* ignore inbound for validation */
1671 if (NULL == GST_plugins_find (address->transport_name))
1673 /* How can we use an address for which we don't have the plugin? */
1677 ve = find_validation_entry (address);
1683 if (in_use == ve->in_use)
1685 ve->in_use = in_use;
1686 if (GNUNET_YES == in_use)
1688 /* from now on, higher frequeny, so reschedule now */
1689 if (NULL != ve->revalidation_task)
1690 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1691 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address,
1698 * Closure for the validation_entries_iterate function.
1700 struct ValidationIteratorContext
1703 * Function to call on each validation entry
1705 GST_ValidationChangedCallback cb;
1708 * Closure for @e cb.
1715 * Function called on each entry in the validation map.
1716 * Passes the information from the validation entry to
1717 * the callback given in the closure.
1719 * @param cls the `struct ValidationIteratorContext`
1720 * @param key peer this is about
1721 * @param value the `struct ValidationEntry`
1722 * @return #GNUNET_OK (continue to iterate)
1725 validation_entries_iterate (void *cls,
1726 const struct GNUNET_PeerIdentity *key,
1729 struct ValidationIteratorContext *ic = cls;
1730 struct ValidationEntry *ve = value;
1732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1733 "Notifying about validation entry for peer `%s' address `%s' \n",
1734 GNUNET_i2s (&ve->address->peer),
1735 GST_plugins_a2s (ve->address));
1740 ve->next_validation,
1747 * Iterate over all iteration entries
1749 * @param cb function to call
1750 * @param cb_cls closure for @a cb
1753 GST_validation_iterate (GST_ValidationChangedCallback cb,
1756 struct ValidationIteratorContext ic;
1758 if (NULL == validation_map)
1759 return; /* can happen during shutdown */
1762 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1763 &validation_entries_iterate,
1767 /* end of file gnunet-service-transport_validation.c */