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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_hello.h"
29 #include "gnunet-service-transport_neighbours.h"
30 #include "gnunet-service-transport_plugins.h"
31 #include "gnunet-service-transport_validation.h"
32 #include "gnunet-service-transport.h"
33 #include "gnunet_hello_lib.h"
34 #include "gnunet_ats_service.h"
35 #include "gnunet_peerinfo_service.h"
36 #include "gnunet_signatures.h"
39 * Current state of a validation process.
41 * FIXME: what state is used to indicate that a validation
42 * was successful? If that is clarified/determined, "UGH" in
43 * ~gnunetpeerinfogtk.c:1103 should be resolved.
45 enum GNUNET_TRANSPORT_ValidationState
50 * Used for final callback indicating operation done
52 GNUNET_TRANSPORT_VS_NONE,
55 * Fresh validation entry
57 * Entry was just created, no validation process was executed
59 GNUNET_TRANSPORT_VS_NEW,
62 * Updated validation entry
64 * This is an update for an existing validation entry
66 GNUNET_TRANSPORT_VS_UPDATE,
69 * Timeout for validation entry
71 * A timeout occured during the validation process
73 GNUNET_TRANSPORT_VS_TIMEOUT,
76 * Validation entry is removed
78 * The validation entry is getting removed due to a failed validation
80 GNUNET_TRANSPORT_VS_REMOVE
87 * How long is a PONG signature valid? We'll recycle a signature until
88 * 1/4 of this time is remaining. PONGs should expire so that if our
89 * external addresses change an adversary cannot replay them indefinitely.
90 * OTOH, we don't want to spend too much time generating PONG signatures,
91 * so they must have some lifetime to reduce our CPU usage.
93 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
96 * After how long do we expire an address in a HELLO that we just
97 * validated? This value is also used for our own addresses when we
100 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
103 * How often do we allow PINGing an address that we have not yet
104 * validated? This also determines how long we track an address that
105 * we cannot validate (because after this time we can destroy the
106 * validation record).
108 #define UNVALIDATED_PING_KEEPALIVE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
111 * How often do we PING an address that we have successfully validated
112 * in the past but are not actively using? Should be (significantly)
113 * smaller than HELLO_ADDRESS_EXPIRATION.
115 #define VALIDATED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
118 * How often do we PING an address that we are currently using?
120 #define CONNECTED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
123 * How much delay is acceptable for sending the PING or PONG?
125 #define ACCEPTABLE_PING_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
128 * Size of the validation map hashmap.
130 #define VALIDATION_MAP_SIZE 256
133 * Priority to use for PINGs
135 #define PING_PRIORITY 2
138 * Priority to use for PONGs
140 #define PONG_PRIORITY 4
143 GNUNET_NETWORK_STRUCT_BEGIN
146 * Message used to ask a peer to validate receipt (to check an address
147 * from a HELLO). Followed by the address we are trying to validate,
148 * or an empty address if we are just sending a PING to confirm that a
149 * connection which the receiver (of the PING) initiated is still valid.
151 struct TransportPingMessage
155 * Type will be #GNUNET_MESSAGE_TYPE_TRANSPORT_PING
157 struct GNUNET_MessageHeader header;
160 * Challenge code (to ensure fresh reply).
162 uint32_t challenge GNUNET_PACKED;
165 * Who is the intended recipient?
167 struct GNUNET_PeerIdentity target;
173 * Message used to validate a HELLO. The challenge is included in the
174 * confirmation to make matching of replies to requests possible. The
175 * signature signs our public key, an expiration time and our address.<p>
177 * This message is followed by our transport address that the PING tried
178 * to confirm (if we liked it). The address can be empty (zero bytes)
179 * if the PING had not address either (and we received the request via
180 * a connection that we initiated).
182 struct TransportPongMessage
186 * Type will be #GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
188 struct GNUNET_MessageHeader header;
191 * Challenge code from PING (showing freshness). Not part of what
192 * is signed so that we can re-use signatures.
194 uint32_t challenge GNUNET_PACKED;
199 struct GNUNET_CRYPTO_EddsaSignature signature;
202 * #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
203 * plausible address for the signing peer.
205 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
208 * When does this signature expire?
210 struct GNUNET_TIME_AbsoluteNBO expiration;
213 * Size of address appended to this message (part of what is
214 * being signed, hence not redundant).
216 uint32_t addrlen GNUNET_PACKED;
219 GNUNET_NETWORK_STRUCT_END
222 * Information about an address under validation
224 struct ValidationEntry
230 struct GNUNET_HELLO_Address *address;
233 * Handle to the blacklist check (if we're currently in it).
235 struct GST_BlacklistCheck *bc;
238 * Cached PONG signature
240 struct GNUNET_CRYPTO_EddsaSignature pong_sig_cache;
243 * ID of task that will clean up this entry if nothing happens.
245 struct GNUNET_SCHEDULER_Task *timeout_task;
248 * ID of task that will trigger address revalidation.
250 struct GNUNET_SCHEDULER_Task *revalidation_task;
253 * At what time did we send the latest validation request (PING)?
255 struct GNUNET_TIME_Absolute send_time;
258 * At what time do we send the next validation request (PING)?
260 struct GNUNET_TIME_Absolute next_validation;
263 * Until when is this address valid?
264 * ZERO if it is not currently considered valid.
266 struct GNUNET_TIME_Absolute valid_until;
269 * Until when is the cached PONG signature valid?
270 * ZERO if it is not currently considered valid.
272 struct GNUNET_TIME_Absolute pong_sig_valid_until;
275 * How long until we can try to validate this address again?
276 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
277 * ZERO if the address is considered valid (no validation needed)
278 * otherwise a time in the future if we're currently denying re-validation
280 struct GNUNET_TIME_Absolute revalidation_block;
283 * Last observed latency for this address (round-trip), delay between
284 * last PING sent and PONG received; FOREVER if we never got a PONG.
286 struct GNUNET_TIME_Relative latency;
289 * Current state of this validation entry
291 enum GNUNET_TRANSPORT_ValidationState state;
294 * Challenge number we used.
299 * When passing the address in #add_valid_peer_address(), did we
300 * copy the address to the HELLO yet?
305 * Are we currently using this address for a connection?
310 * Are we expecting a PONG message for this validation entry?
315 * Is this address known to ATS as valid right now?
320 * Which network type does our address belong to?
322 enum GNUNET_ATS_Network_Type network;
327 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
328 * of the given peer that we are currently validating, have validated
329 * or are blocked from re-validation for a while).
331 static struct GNUNET_CONTAINER_MultiPeerMap *validation_map;
334 * Context for peerinfo iteration.
336 static struct GNUNET_PEERINFO_NotifyContext *pnc;
339 * Minimum delay between to validations
341 static struct GNUNET_TIME_Relative validation_delay;
344 * Number of validations running; any PING that was not yet
345 * matched by a PONG and for which we have not yet hit the
346 * timeout is considered a running 'validation'.
348 static unsigned int validations_running;
351 * Validition fast start threshold
353 static unsigned int validations_fast_start_threshold;
356 * When is next validation allowed
358 static struct GNUNET_TIME_Absolute validation_next;
362 * Context for the validation entry match function.
364 struct ValidationEntryMatchContext
367 * Where to store the result?
369 struct ValidationEntry *ve;
372 * Address we're interested in.
374 const struct GNUNET_HELLO_Address *address;
380 * Provide an update on the `validation_map` map size to statistics.
381 * This function should be called whenever the `validation_map`
385 publish_ve_stat_update ()
387 GNUNET_STATISTICS_set (GST_stats,
388 gettext_noop ("# Addresses in validation map"),
389 GNUNET_CONTAINER_multipeermap_size (validation_map),
395 * Iterate over validation entries until a matching one is found.
397 * @param cls the `struct ValidationEntryMatchContext *`
398 * @param key peer identity (unused)
399 * @param value a `struct ValidationEntry *` to match
400 * @return #GNUNET_YES if the entry does not match,
401 * #GNUNET_NO if the entry does match
404 validation_entry_match (void *cls,
405 const struct GNUNET_PeerIdentity *key,
408 struct ValidationEntryMatchContext *vemc = cls;
409 struct ValidationEntry *ve = value;
411 if (0 == GNUNET_HELLO_address_cmp (ve->address,
422 * A validation entry changed. Update the state and notify
425 * @param ve validation entry that changed
426 * @param state new state
429 validation_entry_changed (struct ValidationEntry *ve,
430 enum GNUNET_TRANSPORT_ValidationState state)
437 * Iterate over validation entries and free them.
439 * @param cls (unused)
440 * @param key peer identity (unused)
441 * @param value a `struct ValidationEntry *` to clean up
442 * @return #GNUNET_YES (continue to iterate)
445 cleanup_validation_entry (void *cls,
446 const struct GNUNET_PeerIdentity *key,
449 struct ValidationEntry *ve = value;
451 ve->next_validation = GNUNET_TIME_UNIT_ZERO_ABS;
452 ve->valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
454 /* Notify about deleted entry */
455 validation_entry_changed (ve,
456 GNUNET_TRANSPORT_VS_REMOVE);
460 GST_blacklist_test_cancel (ve->bc);
463 GNUNET_break (GNUNET_OK ==
464 GNUNET_CONTAINER_multipeermap_remove (validation_map,
467 publish_ve_stat_update ();
468 if (GNUNET_YES == ve->known_to_ats)
470 GST_ats_expire_address (ve->address);
471 GNUNET_assert (GNUNET_NO ==
472 GST_ats_is_known_no_session (ve->address));
473 ve->known_to_ats = GNUNET_NO;
475 GNUNET_HELLO_address_free (ve->address);
476 if (NULL != ve->timeout_task)
478 GNUNET_SCHEDULER_cancel (ve->timeout_task);
479 ve->timeout_task = NULL;
481 if (NULL != ve->revalidation_task)
483 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
484 ve->revalidation_task = NULL;
486 if ( (GNUNET_YES == ve->expecting_pong) &&
487 (validations_running > 0) )
489 validations_running--;
490 GNUNET_STATISTICS_set (GST_stats,
491 gettext_noop ("# validations running"),
501 * Address validation cleanup task. Assesses if the record is no
502 * longer valid and then possibly triggers its removal.
504 * @param cls the `struct ValidationEntry`
507 timeout_hello_validation (void *cls)
509 struct ValidationEntry *ve = cls;
510 struct GNUNET_TIME_Absolute max;
511 struct GNUNET_TIME_Relative left;
513 ve->timeout_task = NULL;
514 /* For valid addresses, we want to wait until the expire;
515 for addresses under PING validation, we want to wait
516 until we give up on the PING */
517 max = GNUNET_TIME_absolute_max (ve->valid_until,
518 ve->revalidation_block);
519 left = GNUNET_TIME_absolute_get_remaining (max);
520 if (left.rel_value_us > 0)
522 /* We should wait a bit longer. This happens when
523 address lifetimes are extended due to successful
526 GNUNET_SCHEDULER_add_delayed (left,
527 &timeout_hello_validation,
531 GNUNET_STATISTICS_update (GST_stats,
532 gettext_noop ("# address records discarded (timeout)"),
535 cleanup_validation_entry (NULL,
542 * Function called with the result from blacklisting.
543 * Send a PING to the other peer if a communication is allowed.
545 * @param cls our `struct ValidationEntry`
546 * @param pid identity of the other peer
547 * @param address_null address associated with the request, always NULL
548 * @param session_null session associated with the request, always NULL
549 * @param result #GNUNET_OK if the connection is allowed,
551 * #GNUNET_SYSERR if operation was aborted
554 transmit_ping_if_allowed (void *cls,
555 const struct GNUNET_PeerIdentity *pid,
556 const struct GNUNET_HELLO_Address *address_null,
557 struct GNUNET_ATS_Session *session_null,
560 struct ValidationEntry *ve = cls;
561 struct TransportPingMessage ping;
562 struct GNUNET_TRANSPORT_PluginFunctions *papi;
563 struct GNUNET_TIME_Absolute next;
564 const struct GNUNET_MessageHeader *hello;
569 struct GNUNET_ATS_Session *session;
572 if (GNUNET_OK != result)
574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
575 "Blacklist denies sending PING to `%s' `%s' `%s'\n",
577 GST_plugins_a2s (ve->address),
578 ve->address->transport_name);
579 GNUNET_STATISTICS_update (GST_stats,
580 gettext_noop ("# address records discarded (blacklist)"),
583 cleanup_validation_entry (NULL,
588 hello = GST_hello_get ();
589 GNUNET_assert (NULL != hello);
590 slen = strlen (ve->address->transport_name) + 1;
591 hsize = ntohs (hello->size);
592 tsize = sizeof (struct TransportPingMessage) +
593 ve->address->address_length + slen + hsize;
596 htons (sizeof (struct TransportPingMessage) +
597 ve->address->address_length + slen);
598 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
599 ping.challenge = htonl (ve->challenge);
602 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
607 sizeof (struct TransportPingMessage) + ve->address->address_length +
611 char message_buf[tsize] GNUNET_ALIGN;
613 GNUNET_memcpy (message_buf,
616 GNUNET_memcpy (&message_buf[hsize],
618 sizeof (struct TransportPingMessage));
619 GNUNET_memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
620 ve->address->transport_name,
622 GNUNET_memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
623 ve->address->address,
624 ve->address->address_length);
625 papi = GST_plugins_find (ve->address->transport_name);
626 GNUNET_assert (NULL != papi);
627 session = papi->get_session (papi->cls,
631 /* Could not get a valid session */
632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
633 "Failed to get session to send PING to `%s' at `%s'\n",
635 GST_plugins_a2s (ve->address));
639 ret = papi->send (papi->cls, session,
642 ACCEPTABLE_PING_DELAY,
646 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
647 "Failed to send PING to `%s' at `%s'\n",
649 GST_plugins_a2s (ve->address));
652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
653 "Transmitted plain PING to `%s' `%s' `%s'\n",
655 GST_plugins_a2s (ve->address),
656 ve->address->transport_name);
657 ve->network = papi->get_network (papi->cls,
659 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != ve->network);
660 GST_neighbours_notify_data_sent (ve->address,
663 next = GNUNET_TIME_relative_to_absolute (validation_delay);
664 validation_next = GNUNET_TIME_absolute_max (next,
666 ve->send_time = GNUNET_TIME_absolute_get ();
667 GNUNET_STATISTICS_update (GST_stats,
668 gettext_noop ("# PINGs for address validation sent"),
671 ve->expecting_pong = GNUNET_YES;
672 validations_running++;
673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
674 "Validation started, %u validation processes running\n",
675 validations_running);
676 GNUNET_STATISTICS_set (GST_stats,
677 gettext_noop ("# validations running"),
680 /* Notify about PING sent */
681 validation_entry_changed (ve,
682 GNUNET_TRANSPORT_VS_UPDATE);
689 * Do address validation again to keep address valid.
691 * @param cls the `struct ValidationEntry`
694 revalidate_address (void *cls)
696 struct ValidationEntry *ve = cls;
697 struct GNUNET_TIME_Relative canonical_delay;
698 struct GNUNET_TIME_Relative delay;
699 struct GNUNET_TIME_Relative blocked_for;
700 struct GST_BlacklistCheck *bc;
703 ve->revalidation_task = NULL;
704 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
705 /* Considering current connectivity situation, what is the maximum
706 block period permitted? */
707 if (GNUNET_YES == ve->in_use)
708 canonical_delay = CONNECTED_PING_FREQUENCY;
709 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
710 canonical_delay = VALIDATED_PING_FREQUENCY;
712 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
713 /* Use delay that is MIN of original delay and possibly adjusted
714 new maximum delay (which may be lower); the real delay
715 is originally randomized between "canonical_delay" and "2 * canonical_delay",
716 so continue to permit that window for the operation. */
717 delay = GNUNET_TIME_relative_min (delay,
718 GNUNET_TIME_relative_multiply (canonical_delay,
720 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
721 if (delay.rel_value_us > 0)
723 /* should wait a bit longer */
724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
725 "Waiting for %s longer before (re)validating address `%s'\n",
726 GNUNET_STRINGS_relative_time_to_string (delay,
728 GST_plugins_a2s (ve->address));
729 ve->revalidation_task =
730 GNUNET_SCHEDULER_add_delayed (delay,
731 &revalidate_address, ve);
732 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
735 /* check if globally we have too many active validations at a
736 too high rate, if so, delay ours */
737 blocked_for = GNUNET_TIME_absolute_get_remaining (validation_next);
738 if ( (validations_running > validations_fast_start_threshold) &&
739 (blocked_for.rel_value_us > 0) )
741 /* Validations are blocked, have to wait for blocked_for time */
742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
743 "Validations blocked for another %s, delaying validating address `%s'\n",
744 GNUNET_STRINGS_relative_time_to_string (blocked_for,
746 GST_plugins_a2s (ve->address));
747 GNUNET_STATISTICS_update (GST_stats,
748 gettext_noop ("# validations delayed by global throttle"),
751 ve->revalidation_task =
752 GNUNET_SCHEDULER_add_delayed (blocked_for,
755 ve->next_validation = GNUNET_TIME_relative_to_absolute (blocked_for);
759 /* We are good to go; remember to not go again for `canonical_delay` time;
760 add up to `canonical_delay` to randomize start time */
761 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
762 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
764 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
765 canonical_delay.rel_value_us);
767 delay = GNUNET_TIME_relative_add (canonical_delay,
768 GNUNET_TIME_relative_multiply
769 (GNUNET_TIME_UNIT_MICROSECONDS,
772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
773 "Validating now, next scheduled for %s, now validating address `%s'\n",
774 GNUNET_STRINGS_relative_time_to_string (blocked_for,
776 GST_plugins_a2s (ve->address));
777 ve->revalidation_task =
778 GNUNET_SCHEDULER_add_delayed (delay,
781 ve->next_validation = GNUNET_TIME_relative_to_absolute (delay);
783 /* start PINGing by checking blacklist */
784 GNUNET_STATISTICS_update (GST_stats,
785 gettext_noop ("# address revalidations started"), 1,
787 bc = GST_blacklist_test_allowed (&ve->address->peer,
788 ve->address->transport_name,
789 &transmit_ping_if_allowed,
794 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
800 * Find a ValidationEntry entry for the given neighbour that matches
801 * the given address and transport. If none exists, create one (but
802 * without starting any validation).
804 * @param address address to find
805 * @return validation entry matching the given specifications, NULL
806 * if we don't have an existing entry and no public key was given
808 static struct ValidationEntry *
809 find_validation_entry (const struct GNUNET_HELLO_Address *address)
811 struct ValidationEntryMatchContext vemc;
812 struct ValidationEntry *ve;
815 vemc.address = address;
816 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
818 &validation_entry_match, &vemc);
819 if (NULL != (ve = vemc.ve))
821 GNUNET_assert (GNUNET_NO ==
822 GST_ats_is_known_no_session (address));
823 ve = GNUNET_new (struct ValidationEntry);
824 ve->in_use = GNUNET_SYSERR; /* not defined */
825 ve->address = GNUNET_HELLO_address_copy (address);
826 ve->pong_sig_valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
827 memset (&ve->pong_sig_cache,
829 sizeof (struct GNUNET_CRYPTO_EddsaSignature));
830 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
832 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
834 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
835 &timeout_hello_validation,
837 GNUNET_CONTAINER_multipeermap_put (validation_map,
840 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
841 publish_ve_stat_update ();
842 validation_entry_changed (ve,
843 GNUNET_TRANSPORT_VS_NEW);
849 * Iterator which adds the given address to the set of validated
852 * @param cls original HELLO message
853 * @param address the address
854 * @param expiration expiration time
855 * @return #GNUNET_OK (keep the address), could return
856 * #GNUNET_NO (delete address, but this is ignored);
857 * #GNUNET_SYSERR would abort iteration (but we always iterate all)
860 add_valid_address (void *cls,
861 const struct GNUNET_HELLO_Address *address,
862 struct GNUNET_TIME_Absolute expiration)
864 const struct GNUNET_HELLO_Message *hello = cls;
865 struct ValidationEntry *ve;
866 struct GNUNET_PeerIdentity pid;
867 struct GNUNET_ATS_Properties prop;
868 struct GNUNET_TRANSPORT_PluginFunctions *papi;
870 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
871 return GNUNET_OK; /* expired */
872 if (GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid))
875 return GNUNET_OK; /* invalid HELLO !? */
877 if (NULL == (papi = GST_plugins_find (address->transport_name)))
879 /* might have been valid in the past, but we don't have that
880 plugin loaded right now */
884 papi->address_to_string (papi->cls,
886 address->address_length))
888 /* Why do we try to add an ill-formed address? */
890 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
891 "Address with %u bytes for plugin %s and peer %s is malformed\n",
892 (unsigned int) address->address_length,
893 address->transport_name,
898 ve = find_validation_entry (address);
899 ve->network = papi->get_network_for_address (papi->cls,
901 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != ve->network);
902 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
904 if (NULL == ve->revalidation_task)
906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
907 "Starting revalidations for valid address `%s'\n",
908 GST_plugins_a2s (ve->address));
909 ve->next_validation = GNUNET_TIME_absolute_get();
910 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
912 validation_entry_changed (ve,
913 GNUNET_TRANSPORT_VS_UPDATE);
914 memset (&prop, 0, sizeof (prop));
915 prop.scope = ve->network;
916 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
917 if (GNUNET_YES != ve->known_to_ats)
919 ve->known_to_ats = GNUNET_YES;
920 GST_ats_add_address (address, &prop);
921 GNUNET_assert (GNUNET_YES ==
922 GST_ats_is_known_no_session (ve->address));
929 * Function called for any HELLO known to PEERINFO.
931 * @param cls unused (NULL)
932 * @param peer id of the peer, NULL for last call (during iteration,
933 * as we are monitoring, this should never happen)
934 * @param hello hello message for the peer (can be NULL)
935 * @param err_msg error message
938 process_peerinfo_hello (void *cls,
939 const struct GNUNET_PeerIdentity *peer,
940 const struct GNUNET_HELLO_Message *hello,
943 GNUNET_assert (NULL != peer);
946 if (0 == memcmp (&GST_my_identity,
948 sizeof (struct GNUNET_PeerIdentity)))
950 /* Peerinfo returned own identity, skip validation */
953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
954 "Handling HELLO for peer `%s'\n",
956 GNUNET_assert (NULL ==
957 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
964 * Start the validation subsystem.
966 * @param max_fds maximum number of fds to use
969 GST_validation_start (unsigned int max_fds)
972 * Initialization for validation throttling
974 * We have a maximum number max_fds of connections we can use for validation
975 * We monitor the number of validations in parallel and start to throttle it
976 * when doing to many validations in parallel:
977 * if (running validations < (max_fds / 2))
978 * - "fast start": run validation immediately
979 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
980 * (300 sec / ~150 == ~2 sec.) between two validations
983 validation_next = GNUNET_TIME_absolute_get();
984 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
985 validations_fast_start_threshold = (max_fds / 2);
986 validations_running = 0;
987 GNUNET_STATISTICS_set (GST_stats,
988 gettext_noop ("# validations running"),
991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
992 "Validation uses a fast start threshold of %u connections and a delay of %s\n",
993 validations_fast_start_threshold,
994 GNUNET_STRINGS_relative_time_to_string (validation_delay,
996 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
998 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
999 &process_peerinfo_hello, NULL);
1004 * Stop the validation subsystem.
1007 GST_validation_stop ()
1009 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1010 &cleanup_validation_entry,
1012 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
1013 validation_map = NULL;
1014 GNUNET_PEERINFO_notify_cancel (pnc);
1019 * Send the given PONG to the given address.
1021 * @param cls the PONG message
1022 * @param valid_until is ZERO if we never validated the address,
1023 * otherwise a time up to when we consider it (or was) valid
1024 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
1025 * is ZERO if the address is considered valid (no validation needed)
1026 * otherwise a time in the future if we're currently denying re-validation
1027 * @param address target address
1030 multicast_pong (void *cls,
1031 struct GNUNET_TIME_Absolute valid_until,
1032 struct GNUNET_TIME_Absolute validation_block,
1033 const struct GNUNET_HELLO_Address *address)
1035 struct TransportPongMessage *pong = cls;
1036 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1037 struct GNUNET_ATS_Session *session;
1039 papi = GST_plugins_find (address->transport_name);
1042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1043 "Plugin %s not supported, cannot send PONG\n",
1044 address->transport_name);
1047 GNUNET_assert (NULL != papi->send);
1048 GNUNET_assert (NULL != papi->get_session);
1049 session = papi->get_session(papi->cls, address);
1050 if (NULL == session)
1055 GST_ats_new_session (address, session);
1056 papi->send (papi->cls, session,
1057 (const char *) pong,
1058 ntohs (pong->header.size),
1060 ACCEPTABLE_PING_DELAY,
1062 GST_neighbours_notify_data_sent (address,
1069 * We've received a PING. If appropriate, generate a PONG.
1071 * @param sender peer sending the PING
1072 * @param hdr the PING
1073 * @param sender_address the sender address as we got it
1074 * @param session session we got the PING from
1075 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1078 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
1079 const struct GNUNET_MessageHeader *hdr,
1080 const struct GNUNET_HELLO_Address *sender_address,
1081 struct GNUNET_ATS_Session *session)
1083 const struct TransportPingMessage *ping;
1084 struct TransportPongMessage *pong;
1085 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1086 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
1087 struct GNUNET_TIME_Absolute *sig_cache_exp;
1089 const char *addrend;
1095 struct GNUNET_HELLO_Address address;
1098 memcmp (&GST_my_identity,
1100 sizeof (struct GNUNET_PeerIdentity)))
1101 return GNUNET_OK; /* our own, ignore! */
1102 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1104 GNUNET_break_op (0);
1105 return GNUNET_SYSERR;
1107 ping = (const struct TransportPingMessage *) hdr;
1109 memcmp (&ping->target, &GST_my_identity,
1110 sizeof (struct GNUNET_PeerIdentity)))
1112 GNUNET_STATISTICS_update (GST_stats,
1114 ("# PING message for different peer received"), 1,
1116 return GNUNET_SYSERR;
1118 GNUNET_STATISTICS_update (GST_stats,
1119 gettext_noop ("# PING messages received"), 1,
1121 addr = (const char *) &ping[1];
1122 len_address = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1123 /* peer wants to confirm that this is one of our addresses, this is what is
1124 * used for address validation */
1127 sig_cache_exp = NULL;
1129 if (len_address > 0)
1131 addrend = memchr (addr, '\0', len_address);
1132 if (NULL == addrend)
1134 GNUNET_break_op (0);
1135 return GNUNET_SYSERR;
1138 len_plugin = strlen (addr) + 1;
1139 len_address -= len_plugin;
1140 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1141 address.address = addrend;
1142 address.address_length = len_address;
1143 address.transport_name = addr;
1144 address.peer = GST_my_identity;
1146 if (NULL == address.transport_name)
1151 if (0 != strstr (address.transport_name, "_client"))
1153 plugin_name = GNUNET_strdup (address.transport_name);
1154 pos = strstr (plugin_name, "_client");
1155 GNUNET_assert (NULL != pos);
1156 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1159 plugin_name = GNUNET_strdup (address.transport_name);
1161 if (NULL == (papi = GST_plugins_find (plugin_name)))
1163 /* we don't have the plugin for this address */
1164 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1165 _("Plugin `%s' not available, cannot confirm having this address\n"),
1167 GNUNET_free (plugin_name);
1168 return GNUNET_SYSERR;
1170 GNUNET_free (plugin_name);
1172 papi->check_address (papi->cls,
1176 GNUNET_STATISTICS_update (GST_stats,
1178 ("# failed address checks during validation"), 1,
1180 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1181 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1182 GST_plugins_a2s (&address));
1183 return GNUNET_SYSERR;
1187 GNUNET_STATISTICS_update (GST_stats,
1189 ("# successful address checks during validation"), 1,
1191 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1192 "Address `%s' is one of my addresses, confirming PING\n",
1193 GST_plugins_a2s (&address));
1197 GST_hello_test_address (&address,
1201 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1202 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1203 GNUNET_i2s (sender),
1204 GST_plugins_a2s (&address));
1205 return GNUNET_SYSERR;
1210 addrend = NULL; /* make gcc happy */
1212 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1213 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1215 sig_cache = &no_address_signature;
1216 sig_cache_exp = &no_address_signature_expiration;
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 "I am `%s', sending PONG to peer `%s'\n",
1221 GNUNET_i2s_full (&GST_my_identity),
1222 GNUNET_i2s (sender));
1224 /* message with structure:
1225 * [TransportPongMessage][Transport name][Address] */
1227 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1229 htons (sizeof (struct TransportPongMessage) + len_address + len_plugin);
1230 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1231 pong->purpose.size =
1232 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1233 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1234 len_address + len_plugin);
1235 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1236 GNUNET_memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1237 pong->addrlen = htonl (len_address + len_plugin);
1238 GNUNET_memcpy (&pong[1], addr, len_plugin); /* Copy transport plugin */
1239 if (len_address > 0)
1241 GNUNET_assert (NULL != addrend);
1242 GNUNET_memcpy (&((char *) &pong[1])[len_plugin], addrend, len_address);
1244 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1245 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1247 /* create / update cached sig */
1248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1249 "Creating PONG signature to indicate ownership.\n");
1250 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1251 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1253 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1256 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1257 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1262 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1264 pong->signature = *sig_cache;
1266 GNUNET_assert (NULL != sender_address);
1268 /* first see if the session we got this PING from can be used to transmit
1269 * a response reliably */
1276 GNUNET_assert (NULL != papi->send);
1277 GNUNET_assert (NULL != papi->get_session);
1278 if (NULL == session)
1280 session = papi->get_session (papi->cls, sender_address);
1282 if (NULL == session)
1289 ret = papi->send (papi->cls, session,
1290 (const char *) pong,
1291 ntohs (pong->header.size),
1292 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1295 GST_neighbours_notify_data_sent (sender_address,
1302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1303 "Transmitted PONG to `%s' via reliable mechanism\n",
1304 GNUNET_i2s (sender));
1306 GNUNET_STATISTICS_update (GST_stats,
1308 ("# PONGs unicast via reliable transport"), 1,
1314 /* no reliable method found, try transmission via all known addresses */
1315 GNUNET_STATISTICS_update (GST_stats,
1317 ("# PONGs multicast to all available addresses"), 1,
1319 GST_validation_get_addresses (sender,
1320 &multicast_pong, pong);
1327 * Validate an individual address.
1329 * @param address address we should try to validate
1332 GST_validation_handle_address (const struct GNUNET_HELLO_Address *address)
1334 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1335 struct ValidationEntry *ve;
1337 papi = GST_plugins_find (address->transport_name);
1340 /* This plugin is currently unvailable ... ignore */
1343 ve = find_validation_entry (address);
1344 if (NULL == ve->revalidation_task)
1346 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1347 "Validation process started for fresh address `%s' of %s\n",
1348 GST_plugins_a2s (ve->address),
1349 GNUNET_i2s (&ve->address->peer));
1350 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1356 * Iterator callback to go over all addresses and try to validate them
1357 * (unless blocked or already validated).
1360 * @param address the address
1361 * @param expiration expiration time
1362 * @return #GNUNET_OK (keep the address)
1365 validate_address_iterator (void *cls,
1366 const struct GNUNET_HELLO_Address *address,
1367 struct GNUNET_TIME_Absolute expiration)
1369 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1372 "Skipping expired address from HELLO\n");
1373 return GNUNET_OK; /* expired */
1375 GST_validation_handle_address (address);
1381 * Add the validated peer address to the HELLO.
1383 * @param cls the `struct ValidationEntry *` with the validated address
1384 * @param max space in @a buf
1385 * @param buf where to add the address
1386 * @return number of bytes written, #GNUNET_SYSERR to signal the
1387 * end of the iteration.
1390 add_valid_peer_address (void *cls,
1394 struct ValidationEntry *ve = cls;
1396 if (GNUNET_YES == ve->copied)
1397 return GNUNET_SYSERR; /* Done */
1398 ve->copied = GNUNET_YES;
1399 return GNUNET_HELLO_add_address (ve->address,
1407 * We've received a PONG. Check if it matches a pending PING and
1408 * mark the respective address as confirmed.
1410 * @param sender peer sending the PONG
1411 * @param hdr the PONG
1412 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1415 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1416 const struct GNUNET_MessageHeader *hdr)
1418 const struct TransportPongMessage *pong;
1419 struct ValidationEntry *ve;
1425 struct GNUNET_HELLO_Message *hello;
1426 struct GNUNET_HELLO_Address address;
1431 memcmp (&GST_my_identity,
1433 sizeof (struct GNUNET_PeerIdentity)))
1434 return GNUNET_OK; /* our own, ignore! */
1436 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1438 GNUNET_break_op (0);
1439 return GNUNET_SYSERR;
1441 GNUNET_STATISTICS_update (GST_stats,
1442 gettext_noop ("# PONG messages received"), 1,
1445 /* message with structure:
1446 * [TransportPongMessage][Transport name][Address] */
1448 pong = (const struct TransportPongMessage *) hdr;
1449 tname = (const char *) &pong[1];
1450 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1451 addr = memchr (tname, '\0', size);
1454 GNUNET_break_op (0);
1455 return GNUNET_SYSERR;
1458 slen = strlen (tname) + 1;
1459 addrlen = size - slen;
1461 if (NULL == GST_plugins_find (tname))
1463 /* we got the PONG, but the transport plugin specified in it
1464 is not supported by this peer, so this cannot be a good
1466 GNUNET_break_op (0);
1470 address.peer = *sender;
1471 address.address = addr;
1472 address.address_length = addrlen;
1473 address.transport_name = tname;
1474 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1475 ve = find_validation_entry (&address);
1476 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1478 GNUNET_STATISTICS_update (GST_stats,
1480 ("# PONGs dropped, no matching pending validation"),
1484 /* now check that PONG is well-formed */
1485 if (0 != memcmp (&ve->address->peer,
1487 sizeof (struct GNUNET_PeerIdentity)))
1489 GNUNET_break_op (0);
1490 return GNUNET_SYSERR;
1493 GNUNET_TIME_absolute_get_remaining
1494 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us)
1496 GNUNET_STATISTICS_update (GST_stats,
1498 ("# PONGs dropped, signature expired"), 1,
1500 return GNUNET_SYSERR;
1503 sig_res = GNUNET_SYSERR;
1504 do_verify = GNUNET_YES;
1505 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1507 /* We have a cached and valid signature for this peer,
1508 * try to compare instead of verify */
1509 if (0 == memcmp (&ve->pong_sig_cache,
1511 sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1513 /* signatures are identical, we can skip verification */
1514 sig_res = GNUNET_OK;
1515 do_verify = GNUNET_NO;
1519 sig_res = GNUNET_SYSERR;
1520 /* signatures do not match, we have to verify */
1524 if (GNUNET_YES == do_verify)
1526 /* Do expensive verification */
1527 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1530 &ve->address->peer.public_key);
1531 if (sig_res == GNUNET_SYSERR)
1533 GNUNET_break_op (0);
1534 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1535 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1537 GST_plugins_a2s (ve->address),
1538 GNUNET_i2s (sender));
1541 if (sig_res == GNUNET_SYSERR)
1543 GNUNET_break_op (0);
1544 return GNUNET_SYSERR;
1547 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1548 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1549 GNUNET_i2s (sender),
1551 GST_plugins_a2s (ve->address));
1552 GNUNET_STATISTICS_update (GST_stats,
1553 gettext_noop ("# validations succeeded"),
1556 /* validity achieved, remember it! */
1557 ve->expecting_pong = GNUNET_NO;
1558 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1559 ve->pong_sig_cache = pong->signature;
1560 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1561 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1563 if (GNUNET_YES == ve->known_to_ats)
1565 GNUNET_assert (GNUNET_YES ==
1566 GST_ats_is_known_no_session (ve->address));
1567 GST_ats_update_delay (ve->address,
1568 GNUNET_TIME_relative_divide (ve->latency, 2));
1572 struct GNUNET_ATS_Properties prop;
1574 memset (&prop, 0, sizeof (prop));
1575 GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != ve->network);
1576 prop.scope = ve->network;
1577 prop.delay = GNUNET_TIME_relative_divide (ve->latency, 2);
1578 GNUNET_assert (GNUNET_NO ==
1579 GST_ats_is_known_no_session (ve->address));
1580 ve->known_to_ats = GNUNET_YES;
1581 GST_ats_add_address (ve->address, &prop);
1582 GNUNET_assert (GNUNET_YES ==
1583 GST_ats_is_known_no_session (ve->address));
1586 if (validations_running > 0)
1588 validations_running--;
1589 GNUNET_STATISTICS_set (GST_stats,
1590 gettext_noop ("# validations running"),
1591 validations_running,
1593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1594 "Validation finished, %u validation processes running\n",
1595 validations_running);
1602 /* Notify about new validity */
1603 validation_entry_changed (ve,
1604 GNUNET_TRANSPORT_VS_UPDATE);
1606 /* build HELLO to store in PEERINFO */
1607 ve->copied = GNUNET_NO;
1608 hello = GNUNET_HELLO_create (&ve->address->peer.public_key,
1609 &add_valid_peer_address,
1612 GNUNET_PEERINFO_add_peer (GST_peerinfo,
1616 GNUNET_free (hello);
1622 * We've received a HELLO, check which addresses are new and trigger
1625 * @param hello the HELLO we received
1626 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1629 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1631 const struct GNUNET_HELLO_Message *hm =
1632 (const struct GNUNET_HELLO_Message *) hello;
1633 struct GNUNET_PeerIdentity pid;
1636 friend = GNUNET_HELLO_is_friend_only (hm);
1637 if ( ( (GNUNET_YES != friend) &&
1638 (GNUNET_NO != friend) ) ||
1639 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &pid)) )
1641 /* malformed HELLO */
1642 GNUNET_break_op (0);
1643 return GNUNET_SYSERR;
1646 memcmp (&GST_my_identity,
1648 sizeof (struct GNUNET_PeerIdentity)))
1650 /* got our own HELLO, how boring */
1653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1654 "Validation received HELLO message for peer `%s' with size %u, checking for new addresses\n",
1656 ntohs (hello->size));
1657 GNUNET_assert (NULL ==
1658 GNUNET_HELLO_iterate_addresses (hm,
1660 &validate_address_iterator,
1667 * Closure for #iterate_addresses().
1669 struct IteratorContext
1672 * Function to call on each address.
1674 GST_ValidationAddressCallback cb;
1677 * Closure for @e cb.
1685 * Call the callback in the closure for each validation entry.
1687 * @param cls the `struct IteratorContext`
1688 * @param key the peer's identity
1689 * @param value the `struct ValidationEntry`
1690 * @return #GNUNET_OK (continue to iterate)
1693 iterate_addresses (void *cls,
1694 const struct GNUNET_PeerIdentity *key,
1697 struct IteratorContext *ic = cls;
1698 struct ValidationEntry *ve = value;
1702 ve->revalidation_block,
1709 * Call the given function for each address for the given target.
1710 * Can either give a snapshot (synchronous API) or be continuous.
1712 * @param target peer information is requested for
1713 * @param cb function to call; will not be called after this function returns
1714 * @param cb_cls closure for @a cb
1717 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1718 GST_ValidationAddressCallback cb,
1721 struct IteratorContext ic;
1725 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1727 &iterate_addresses, &ic);
1732 * Update if we are using an address for a connection actively right now.
1733 * Based on this, the validation module will measure latency for the
1734 * address more or less often.
1736 * @param address the address that we are now using (or not)
1737 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1738 * #GNUNET_NO if we are no longer using the address for a connection
1741 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1744 struct ValidationEntry *ve;
1746 if (GNUNET_HELLO_address_check_option (address,
1747 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1748 return; /* ignore inbound for validation */
1749 if (NULL == GST_plugins_find (address->transport_name))
1751 /* How can we use an address for which we don't have the plugin? */
1755 ve = find_validation_entry (address);
1761 if (in_use == ve->in_use)
1763 ve->in_use = in_use;
1764 if (GNUNET_YES == in_use)
1766 /* from now on, higher frequeny, so reschedule now */
1767 if (NULL != ve->revalidation_task)
1768 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1769 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address,
1775 /* end of file gnunet-service-transport_validation.c */