2 This file is part of GNUnet.
3 (C) 2010-2013 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_validation.h"
28 #include "gnunet-service-transport_plugins.h"
29 #include "gnunet-service-transport_hello.h"
30 #include "gnunet-service-transport_blacklist.h"
31 #include "gnunet-service-transport_neighbours.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"
40 * How long is a PONG signature valid? We'll recycle a signature until
41 * 1/4 of this time is remaining. PONGs should expire so that if our
42 * external addresses change an adversary cannot replay them indefinitely.
43 * OTOH, we don't want to spend too much time generating PONG signatures,
44 * so they must have some lifetime to reduce our CPU usage.
46 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
49 * After how long do we expire an address in a HELLO that we just
50 * validated? This value is also used for our own addresses when we
53 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
56 * How often do we allow PINGing an address that we have not yet
57 * validated? This also determines how long we track an address that
58 * we cannot validate (because after this time we can destroy the
61 #define UNVALIDATED_PING_KEEPALIVE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
64 * How often do we PING an address that we have successfully validated
65 * in the past but are not actively using? Should be (significantly)
66 * smaller than HELLO_ADDRESS_EXPIRATION.
68 #define VALIDATED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
71 * How often do we PING an address that we are currently using?
73 #define CONNECTED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
76 * How much delay is acceptable for sending the PING or PONG?
78 #define ACCEPTABLE_PING_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
81 * Size of the validation map hashmap.
83 #define VALIDATION_MAP_SIZE 256
86 * Priority to use for PINGs
88 #define PING_PRIORITY 2
91 * Priority to use for PONGs
93 #define PONG_PRIORITY 4
96 GNUNET_NETWORK_STRUCT_BEGIN
99 * Message used to ask a peer to validate receipt (to check an address
100 * from a HELLO). Followed by the address we are trying to validate,
101 * or an empty address if we are just sending a PING to confirm that a
102 * connection which the receiver (of the PING) initiated is still valid.
104 struct TransportPingMessage
108 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
110 struct GNUNET_MessageHeader header;
113 * Challenge code (to ensure fresh reply).
115 uint32_t challenge GNUNET_PACKED;
118 * Who is the intended recipient?
120 struct GNUNET_PeerIdentity target;
126 * Message used to validate a HELLO. The challenge is included in the
127 * confirmation to make matching of replies to requests possible. The
128 * signature signs our public key, an expiration time and our address.<p>
130 * This message is followed by our transport address that the PING tried
131 * to confirm (if we liked it). The address can be empty (zero bytes)
132 * if the PING had not address either (and we received the request via
133 * a connection that we initiated).
135 struct TransportPongMessage
139 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
141 struct GNUNET_MessageHeader header;
144 * Challenge code from PING (showing freshness). Not part of what
145 * is signed so that we can re-use signatures.
147 uint32_t challenge GNUNET_PACKED;
152 struct GNUNET_CRYPTO_EddsaSignature signature;
155 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
156 * plausible address for the signing peer.
158 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
161 * When does this signature expire?
163 struct GNUNET_TIME_AbsoluteNBO expiration;
166 * Size of address appended to this message (part of what is
167 * being signed, hence not redundant).
169 uint32_t addrlen GNUNET_PACKED;
172 GNUNET_NETWORK_STRUCT_END
175 * Information about an address under validation
177 struct ValidationEntry
183 struct GNUNET_HELLO_Address *address;
186 * Handle to the blacklist check (if we're currently in it).
188 struct GST_BlacklistCheck *bc;
191 * Public key of the peer.
193 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
196 * The identity of the peer. FIXME: duplicated (also in 'address')
198 struct GNUNET_PeerIdentity pid;
201 * Cached PONG signature
203 struct GNUNET_CRYPTO_EddsaSignature pong_sig_cache;
206 * ID of task that will clean up this entry if nothing happens.
208 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
211 * ID of task that will trigger address revalidation.
213 GNUNET_SCHEDULER_TaskIdentifier revalidation_task;
216 * At what time did we send the latest validation request (PING)?
218 struct GNUNET_TIME_Absolute send_time;
221 * At what time do we send the next validation request (PING)?
223 struct GNUNET_TIME_Absolute next_validation;
226 * Until when is this address valid?
227 * ZERO if it is not currently considered valid.
229 struct GNUNET_TIME_Absolute valid_until;
232 * Until when is the cached PONG signature valid?
233 * ZERO if it is not currently considered valid.
235 struct GNUNET_TIME_Absolute pong_sig_valid_until;
238 * How long until we can try to validate this address again?
239 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
240 * ZERO if the address is considered valid (no validation needed)
241 * otherwise a time in the future if we're currently denying re-validation
243 struct GNUNET_TIME_Absolute revalidation_block;
246 * Last observed latency for this address (round-trip), delay between
247 * last PING sent and PONG received; FOREVER if we never got a PONG.
249 struct GNUNET_TIME_Relative latency;
252 * Current state of this validation entry
254 enum GNUNET_TRANSPORT_ValidationState state;
256 * Challenge number we used.
261 * When passing the address in 'add_valid_peer_address', did we
262 * copy the address to the HELLO yet?
267 * Are we currently using this address for a connection?
272 * Are we expecting a PONG message for this validation entry?
276 enum GNUNET_ATS_Network_Type network;
281 * Context of currently active requests to peerinfo
282 * for validation of HELLOs.
284 struct CheckHelloValidatedContext
288 * This is a doubly-linked list.
290 struct CheckHelloValidatedContext *next;
293 * This is a doubly-linked list.
295 struct CheckHelloValidatedContext *prev;
298 * Hello that we are validating.
300 const struct GNUNET_HELLO_Message *hello;
306 * Head of linked list of HELLOs awaiting validation.
308 static struct CheckHelloValidatedContext *chvc_head;
311 * Tail of linked list of HELLOs awaiting validation
313 static struct CheckHelloValidatedContext *chvc_tail;
316 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
317 * of the given peer that we are currently validating, have validated
318 * or are blocked from re-validation for a while).
320 static struct GNUNET_CONTAINER_MultiPeerMap *validation_map;
323 * Context for peerinfo iteration.
325 static struct GNUNET_PEERINFO_NotifyContext *pnc;
329 * Minimum delay between to validations
331 static struct GNUNET_TIME_Relative validation_delay;
334 * Number of validations running
336 static unsigned int validations_running;
339 * Validition fast start threshold
341 static unsigned int validations_fast_start_threshold;
344 * When is next validation allowed
346 static struct GNUNET_TIME_Absolute validation_next;
348 static GST_ValidationChangedCallback validation_entry_changed_cb;
349 static void *validation_entry_changed_cb_cls;
352 * Context for the validation entry match function.
354 struct ValidationEntryMatchContext
357 * Where to store the result?
359 struct ValidationEntry *ve;
362 * Address we're interested in.
364 const struct GNUNET_HELLO_Address *address;
370 * Iterate over validation entries until a matching one is found.
372 * @param cls the 'struct ValidationEntryMatchContext'
373 * @param key peer identity (unused)
374 * @param value a 'struct ValidationEntry' to match
375 * @return GNUNET_YES if the entry does not match,
376 * GNUNET_NO if the entry does match
379 validation_entry_match (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
381 struct ValidationEntryMatchContext *vemc = cls;
382 struct ValidationEntry *ve = value;
384 if (0 == GNUNET_HELLO_address_cmp (ve->address, vemc->address))
393 validation_entry_changed (struct ValidationEntry *ve, enum GNUNET_TRANSPORT_ValidationState state)
395 char *t_sent = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string(ve->send_time));
396 char *t_valid = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string(ve->valid_until));
397 char *t_next = GNUNET_strdup(GNUNET_STRINGS_absolute_time_to_string(ve->next_validation));
398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Validation entry changed for peer `%s' address `%s':\n\tSent: %s\n\tValid: %s\n\tNext: %s\n",
399 GNUNET_i2s(&ve->pid), GST_plugins_a2s(ve->address),
400 t_sent, t_valid, t_next);
403 GNUNET_free (t_sent);
404 GNUNET_free (t_valid);
405 GNUNET_free (t_next);
406 validation_entry_changed_cb (validation_entry_changed_cb_cls, &ve->pid,
407 ve->address, ve->send_time, ve->valid_until, ve->next_validation, state);
412 * Iterate over validation entries and free them.
414 * @param cls (unused)
415 * @param key peer identity (unused)
416 * @param value a 'struct ValidationEntry' to clean up
417 * @return GNUNET_YES (continue to iterate)
420 cleanup_validation_entry (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
422 struct ValidationEntry *ve = value;
424 ve->next_validation = GNUNET_TIME_absolute_get_zero_();
425 ve->valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
427 /* Notify about deleted entry */
428 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_REMOVE);
432 GST_blacklist_test_cancel (ve->bc);
435 GNUNET_break (GNUNET_OK ==
436 GNUNET_CONTAINER_multipeermap_remove (validation_map,
438 GNUNET_HELLO_address_free (ve->address);
439 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
441 GNUNET_SCHEDULER_cancel (ve->timeout_task);
442 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
444 if (GNUNET_SCHEDULER_NO_TASK != ve->revalidation_task)
446 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
447 ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
449 if ((GNUNET_YES == ve->expecting_pong) &&
450 (validations_running > 0))
452 validations_running --;
453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
454 "Validation finished, %u validation processes running\n",
455 validations_running);
463 * Address validation cleanup task. Assesses if the record is no
464 * longer valid and then possibly triggers its removal.
466 * @param cls the 'struct ValidationEntry'
467 * @param tc scheduler context (unused)
470 timeout_hello_validation (void *cls,
471 const struct GNUNET_SCHEDULER_TaskContext *tc)
473 struct ValidationEntry *ve = cls;
474 struct GNUNET_TIME_Absolute max;
475 struct GNUNET_TIME_Relative left;
477 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
478 max = GNUNET_TIME_absolute_max (ve->valid_until, ve->revalidation_block);
479 left = GNUNET_TIME_absolute_get_remaining (max);
480 if (left.rel_value_us > 0)
482 /* should wait a bit longer */
484 GNUNET_SCHEDULER_add_delayed (left, &timeout_hello_validation, ve);
487 GNUNET_STATISTICS_update (GST_stats,
488 gettext_noop ("# address records discarded"), 1,
490 cleanup_validation_entry (NULL, &ve->pid, ve);
495 * Function called with the result from blacklisting.
496 * Send a PING to the other peer if a communication is allowed.
498 * @param cls our 'struct ValidationEntry'
499 * @param pid identity of the other peer
500 * @param result #GNUNET_OK if the connection is allowed, #GNUNET_NO if not
503 transmit_ping_if_allowed (void *cls,
504 const struct GNUNET_PeerIdentity *pid,
507 struct ValidationEntry *ve = cls;
508 struct TransportPingMessage ping;
509 struct GNUNET_TRANSPORT_PluginFunctions *papi;
510 struct GNUNET_TIME_Absolute next;
511 const struct GNUNET_MessageHeader *hello;
512 enum GNUNET_ATS_Network_Type network;
519 if (GNUNET_NO == result)
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
522 "Blacklist denies to send PING to `%s' `%s' `%s'\n",
524 GST_plugins_a2s (ve->address),
525 ve->address->transport_name);
529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
530 "Transmitting plain PING to `%s' `%s' `%s'\n",
532 GST_plugins_a2s (ve->address),
533 ve->address->transport_name);
535 next = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
537 if (next.abs_value_us > validation_next.abs_value_us)
538 validation_next = next; /* We're going to send a PING so delay next validation */
540 slen = strlen (ve->address->transport_name) + 1;
541 hello = GST_hello_get ();
542 hsize = ntohs (hello->size);
544 sizeof (struct TransportPingMessage) + ve->address->address_length +
548 htons (sizeof (struct TransportPingMessage) +
549 ve->address->address_length + slen);
550 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
551 ping.challenge = htonl (ve->challenge);
554 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
556 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
558 ("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
559 "HELLO", "PING", (unsigned int) tsize);
560 /* message too big (!?), get rid of HELLO */
563 sizeof (struct TransportPingMessage) + ve->address->address_length +
567 char message_buf[tsize];
569 /* build message with structure:
570 * [HELLO][TransportPingMessage][Transport name][Address] */
571 memcpy (message_buf, hello, hsize);
572 memcpy (&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
573 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
574 ve->address->transport_name, slen);
575 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
576 ve->address->address, ve->address->address_length);
577 papi = GST_plugins_find (ve->address->transport_name);
582 GNUNET_assert (papi->send != NULL);
583 GNUNET_assert (papi->get_session != NULL);
584 struct Session * session = papi->get_session(papi->cls, ve->address);
588 ret = papi->send (papi->cls, session,
590 PING_PRIORITY, ACCEPTABLE_PING_DELAY,
592 network = papi->get_network (ve->address, session);
593 if (GNUNET_ATS_NET_UNSPECIFIED == network)
595 GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
596 "Could not obtain a valid network for `%s' `%s'\n",
597 GNUNET_i2s (pid), GST_plugins_a2s (ve->address));
600 GST_neighbours_notify_data_sent (pid, ve->address, session, tsize);
604 /* Could not get a valid session */
605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Could not get a valid session for `%s' `%s'\n",
606 GNUNET_i2s (pid), GST_plugins_a2s (ve->address));
613 ve->send_time = GNUNET_TIME_absolute_get ();
614 GNUNET_STATISTICS_update (GST_stats,
616 ("# PING without HELLO messages sent"), 1,
619 ve->network = network;
620 ve->expecting_pong = GNUNET_YES;
621 validations_running ++;
622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
623 "Validation started, %u validation processes running\n",
624 validations_running);
625 /* Notify about PING sent */
626 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
632 * Do address validation again to keep address valid.
634 * @param cls the 'struct ValidationEntry'
635 * @param tc scheduler context (unused)
638 revalidate_address (void *cls,
639 const struct GNUNET_SCHEDULER_TaskContext *tc)
641 struct ValidationEntry *ve = cls;
642 struct GNUNET_TIME_Relative canonical_delay;
643 struct GNUNET_TIME_Relative delay;
644 struct GNUNET_TIME_Relative blocked_for;
645 struct GST_BlacklistCheck *bc;
648 ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
649 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
650 /* How long until we can possibly permit the next PING? */
653 GNUNET_YES) ? CONNECTED_PING_FREQUENCY
654 : ((GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us >
655 0) ? VALIDATED_PING_FREQUENCY : UNVALIDATED_PING_KEEPALIVE);
656 if (delay.rel_value_us > canonical_delay.rel_value_us * 2)
658 /* situation changed, recalculate delay */
659 delay = canonical_delay;
660 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
662 if (delay.rel_value_us > 0)
664 /* should wait a bit longer */
665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
666 "Waiting for %s longer before validating address `%s'\n",
667 GNUNET_STRINGS_relative_time_to_string (delay,
669 GST_plugins_a2s (ve->address));
670 ve->revalidation_task =
671 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
672 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), delay);
675 blocked_for = GNUNET_TIME_absolute_get_remaining(validation_next);
676 if ((validations_running > validations_fast_start_threshold) &&
677 (blocked_for.rel_value_us > 0))
679 /* Validations are blocked, have to wait for blocked_for time */
680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
681 "Validations blocked for another %s, delaying validating address `%s'\n",
682 GNUNET_STRINGS_relative_time_to_string (blocked_for,
684 GST_plugins_a2s (ve->address));
685 ve->revalidation_task =
686 GNUNET_SCHEDULER_add_delayed (blocked_for, &revalidate_address, ve);
687 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), blocked_for);
690 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
692 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
694 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
695 canonical_delay.rel_value_us);
697 /* Debug code for mantis 0002726 */
698 if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us ==
699 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MICROSECONDS, rdelay).rel_value_us)
702 delay = canonical_delay;
706 delay = GNUNET_TIME_relative_add (canonical_delay,
707 GNUNET_TIME_relative_multiply
708 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
710 /* End debug code for mantis 0002726*/
711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
712 "Validating now, next scheduled for %s, now validating address `%s'\n",
713 GNUNET_STRINGS_relative_time_to_string (blocked_for,
715 GST_plugins_a2s (ve->address));
716 ve->revalidation_task =
717 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
718 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), delay);
720 /* start PINGing by checking blacklist */
721 GNUNET_STATISTICS_update (GST_stats,
722 gettext_noop ("# address revalidations started"), 1,
724 bc = GST_blacklist_test_allowed (&ve->pid, ve->address->transport_name,
725 &transmit_ping_if_allowed, ve);
727 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
733 * Find a ValidationEntry entry for the given neighbour that matches
734 * the given address and transport. If none exists, create one (but
735 * without starting any validation).
737 * @param public_key public key of the peer, NULL for unknown
738 * @param address address to find
739 * @return validation entry matching the given specifications, NULL
740 * if we don't have an existing entry and no public key was given
742 static struct ValidationEntry *
743 find_validation_entry (const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
744 const struct GNUNET_HELLO_Address *address)
746 struct ValidationEntryMatchContext vemc;
747 struct ValidationEntry *ve;
750 vemc.address = address;
751 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
753 &validation_entry_match, &vemc);
754 if (NULL != (ve = vemc.ve))
756 if (public_key == NULL)
758 ve = GNUNET_new (struct ValidationEntry);
759 ve->in_use = GNUNET_SYSERR; /* not defined */
760 ve->address = GNUNET_HELLO_address_copy (address);
761 ve->public_key = *public_key;
762 ve->pid = address->peer;
763 ve->pong_sig_valid_until = GNUNET_TIME_absolute_get_zero_();
764 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
765 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
767 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
769 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
770 &timeout_hello_validation, ve);
771 GNUNET_CONTAINER_multipeermap_put (validation_map, &address->peer,
773 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
774 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
775 ve->expecting_pong = GNUNET_NO;
781 * Iterator which adds the given address to the set of validated
784 * @param cls original HELLO message
785 * @param address the address
786 * @param expiration expiration time
787 * @return #GNUNET_OK (keep the address)
790 add_valid_address (void *cls,
791 const struct GNUNET_HELLO_Address *address,
792 struct GNUNET_TIME_Absolute expiration)
794 const struct GNUNET_HELLO_Message *hello = cls;
795 struct ValidationEntry *ve;
796 struct GNUNET_PeerIdentity pid;
797 struct GNUNET_ATS_Information ats;
798 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
800 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
801 return GNUNET_OK; /* expired */
802 if ((GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid)) ||
803 (GNUNET_OK != GNUNET_HELLO_get_key (hello, &public_key)))
806 return GNUNET_OK; /* invalid HELLO !? */
808 if (0 == memcmp (&GST_my_identity,
810 sizeof (struct GNUNET_PeerIdentity)))
812 /* Peerinfo returned own identity, skip validation */
816 ve = find_validation_entry (&public_key, address);
817 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until, expiration);
819 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Starting revalidations for valid address `%s'\n",
823 GST_plugins_a2s (ve->address));
824 ve->next_validation = GNUNET_TIME_absolute_get();
825 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
827 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
829 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
830 ats.value = htonl (ve->network);
831 GNUNET_ATS_address_add (GST_ats, address, NULL, &ats, 1);
838 * Function called for any HELLO known to PEERINFO.
841 * @param peer id of the peer, NULL for last call
842 * @param hello hello message for the peer (can be NULL)
843 * @param err_msg error message
846 process_peerinfo_hello (void *cls, const struct GNUNET_PeerIdentity *peer,
847 const struct GNUNET_HELLO_Message *hello,
850 GNUNET_assert (NULL != peer);
853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
854 "Handling HELLO for peer `%s'\n",
856 GNUNET_assert (NULL ==
857 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
864 * Start the validation subsystem.
866 * @param cb callback to call with changes to valdidation entries
867 * @param cb_cls cls for the callback
868 * @param max_fds maximum number of fds to use
871 GST_validation_start (GST_ValidationChangedCallback cb, void *cb_cls, unsigned int max_fds)
874 * Initialization for validation throttling
876 * We have a maximum number max_fds of connections we can use for validation
877 * We monitor the number of validations in parallel and start to throttle it
878 * when doing to many validations in parallel:
879 * if (running validations < (max_fds / 2))
880 * - "fast start": run validation immediately
881 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
882 * (300 sec / ~150 == ~2 sec.) between two validations
885 validation_next = GNUNET_TIME_absolute_get();
886 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
887 validations_fast_start_threshold = (max_fds / 2);
888 validations_running = 0;
889 validation_entry_changed_cb = cb;
890 validation_entry_changed_cb_cls = cb_cls;
891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Validation uses a fast start threshold of %u connections and a delay between of %s\n ",
892 validations_fast_start_threshold,
893 GNUNET_STRINGS_relative_time_to_string (validation_delay,
895 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
897 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
898 &process_peerinfo_hello, NULL);
903 * Stop the validation subsystem.
906 GST_validation_stop ()
908 struct CheckHelloValidatedContext *chvc;
910 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
911 &cleanup_validation_entry, NULL);
912 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
913 validation_map = NULL;
914 while (NULL != (chvc = chvc_head))
916 GNUNET_CONTAINER_DLL_remove (chvc_head, chvc_tail, chvc);
919 GNUNET_PEERINFO_notify_cancel (pnc);
924 * Send the given PONG to the given address.
926 * @param cls the PONG message
927 * @param public_key public key for the peer, never NULL
928 * @param valid_until is ZERO if we never validated the address,
929 * otherwise a time up to when we consider it (or was) valid
930 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
931 * is ZERO if the address is considered valid (no validation needed)
932 * otherwise a time in the future if we're currently denying re-validation
933 * @param address target address
936 multicast_pong (void *cls,
937 const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
938 struct GNUNET_TIME_Absolute valid_until,
939 struct GNUNET_TIME_Absolute validation_block,
940 const struct GNUNET_HELLO_Address *address)
942 struct TransportPongMessage *pong = cls;
943 struct GNUNET_TRANSPORT_PluginFunctions *papi;
945 papi = GST_plugins_find (address->transport_name);
949 GNUNET_assert (papi->send != NULL);
950 GNUNET_assert (papi->get_session != NULL);
952 struct Session * session = papi->get_session(papi->cls, address);
959 papi->send (papi->cls, session,
960 (const char *) pong, ntohs (pong->header.size),
961 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
963 GST_neighbours_notify_data_sent (&address->peer,
964 address, session, pong->header.size);
970 * We've received a PING. If appropriate, generate a PONG.
972 * @param sender peer sending the PING
973 * @param hdr the PING
974 * @param sender_address the sender address as we got it
975 * @param session session we got the PING from
976 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
979 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
980 const struct GNUNET_MessageHeader *hdr,
981 const struct GNUNET_HELLO_Address *sender_address,
982 struct Session *session)
984 const struct TransportPingMessage *ping;
985 struct TransportPongMessage *pong;
986 struct GNUNET_TRANSPORT_PluginFunctions *papi;
987 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
988 struct GNUNET_TIME_Absolute *sig_cache_exp;
996 int buggy = GNUNET_NO;
997 struct GNUNET_HELLO_Address address;
999 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1001 GNUNET_break_op (0);
1002 return GNUNET_SYSERR;
1004 ping = (const struct TransportPingMessage *) hdr;
1006 memcmp (&ping->target, &GST_my_identity,
1007 sizeof (struct GNUNET_PeerIdentity)))
1009 GNUNET_STATISTICS_update (GST_stats,
1011 ("# PING message for different peer received"), 1,
1013 return GNUNET_SYSERR;
1015 GNUNET_STATISTICS_update (GST_stats,
1016 gettext_noop ("# PING messages received"), 1,
1018 addr = (const char *) &ping[1];
1019 alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1020 /* peer wants to confirm that this is one of our addresses, this is what is
1021 * used for address validation */
1024 sig_cache_exp = NULL;
1028 addrend = memchr (addr, '\0', alen);
1029 if (NULL == addrend)
1031 GNUNET_break_op (0);
1032 return GNUNET_SYSERR;
1035 slen = strlen (addr) + 1;
1037 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1038 address.address = addrend;
1039 address.address_length = alen;
1040 address.transport_name = addr;
1041 address.peer = GST_my_identity;
1043 if (NULL == address.transport_name)
1048 if (0 != strstr (address.transport_name, "_client"))
1050 plugin_name = GNUNET_strdup (address.transport_name);
1051 pos = strstr (plugin_name, "_client");
1052 GNUNET_assert (NULL != pos);
1053 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1056 plugin_name = GNUNET_strdup (address.transport_name);
1058 if (NULL == (papi = GST_plugins_find (plugin_name)))
1060 /* we don't have the plugin for this address */
1061 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1062 _("Plugin `%s' not available, cannot confirm having this address\n"),
1064 GNUNET_free (plugin_name);
1065 return GNUNET_SYSERR;
1067 GNUNET_free (plugin_name);
1068 if (GNUNET_OK != papi->check_address (papi->cls, addrend, alen))
1070 GNUNET_STATISTICS_update (GST_stats,
1072 ("# failed address checks during validation"), 1,
1074 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1075 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1076 GST_plugins_a2s (&address));
1077 return GNUNET_SYSERR;
1081 GNUNET_STATISTICS_update (GST_stats,
1083 ("# successful address checks during validation"), 1,
1085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1086 "Address `%s' is one of my addresses, confirming PING\n",
1087 GST_plugins_a2s (&address));
1090 if (GNUNET_YES != GST_hello_test_address (&address, &sig_cache, &sig_cache_exp))
1092 if (GNUNET_NO == buggy)
1094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1095 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1096 GNUNET_i2s (sender),
1097 GST_plugins_a2s (&address));
1098 return GNUNET_SYSERR;
1102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1103 _("Received a PING message with validation bug from `%s'\n"),
1104 GNUNET_i2s (sender));
1110 addrend = NULL; /* make gcc happy */
1112 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1113 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1115 sig_cache = &no_address_signature;
1116 sig_cache_exp = &no_address_signature_expiration;
1119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1120 "I am `%s', sending PONG to peer `%s'\n",
1121 GNUNET_i2s_full (&GST_my_identity),
1122 GNUNET_i2s (sender));
1124 /* message with structure:
1125 * [TransportPongMessage][Transport name][Address] */
1127 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
1129 htons (sizeof (struct TransportPongMessage) + alen + slen);
1130 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1131 pong->purpose.size =
1132 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1133 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1135 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1136 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1137 pong->addrlen = htonl (alen + slen);
1138 memcpy (&pong[1], addr, slen); /* Copy transport plugin */
1141 GNUNET_assert (NULL != addrend);
1142 memcpy (&((char *) &pong[1])[slen], addrend, alen);
1144 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1145 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1147 /* create / update cached sig */
1148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1149 "Creating PONG signature to indicate ownership.\n");
1150 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1151 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1153 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1156 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1157 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1162 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1164 pong->signature = *sig_cache;
1166 GNUNET_assert (sender_address != NULL);
1168 /* first see if the session we got this PING from can be used to transmit
1169 * a response reliably */
1174 GNUNET_assert (papi->send != NULL);
1175 GNUNET_assert (papi->get_session != NULL);
1177 if (session == NULL)
1179 session = papi->get_session (papi->cls, sender_address);
1181 if (session == NULL)
1188 ret = papi->send (papi->cls, session,
1189 (const char *) pong, ntohs (pong->header.size),
1190 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1193 GST_neighbours_notify_data_sent (sender,
1194 sender_address, session,
1200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1201 "Transmitted PONG to `%s' via reliable mechanism\n",
1202 GNUNET_i2s (sender));
1204 GNUNET_STATISTICS_update (GST_stats,
1206 ("# PONGs unicast via reliable transport"), 1,
1212 /* no reliable method found, try transmission via all known addresses */
1213 GNUNET_STATISTICS_update (GST_stats,
1215 ("# PONGs multicast to all available addresses"), 1,
1217 GST_validation_get_addresses (sender,
1218 &multicast_pong, pong);
1225 * Context for the #validate_address_iterator() function
1227 struct ValidateAddressContext
1230 * Hash of the public key of the peer whose address is being validated.
1232 struct GNUNET_PeerIdentity pid;
1235 * Public key of the peer whose address is being validated.
1237 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
1243 * Iterator callback to go over all addresses and try to validate them
1244 * (unless blocked or already validated).
1246 * @param cls pointer to a `struct ValidateAddressContext`
1247 * @param address the address
1248 * @param expiration expiration time
1249 * @return #GNUNET_OK (keep the address)
1252 validate_address_iterator (void *cls,
1253 const struct GNUNET_HELLO_Address *address,
1254 struct GNUNET_TIME_Absolute expiration)
1256 const struct ValidateAddressContext *vac = cls;
1257 struct ValidationEntry *ve;
1259 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Skipping expired address from HELLO\n");
1263 return GNUNET_OK; /* expired */
1265 ve = find_validation_entry (&vac->public_key, address);
1266 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
1268 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1269 "Validation process started for fresh address `%s'\n",
1270 GST_plugins_a2s (ve->address));
1271 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1278 * Add the validated peer address to the HELLO.
1280 * @param cls the 'struct ValidationEntry' with the validated address
1281 * @param max space in buf
1282 * @param buf where to add the address
1283 * @return number of bytes written, 0 to signal the
1284 * end of the iteration.
1287 add_valid_peer_address (void *cls, size_t max, void *buf)
1289 struct ValidationEntry *ve = cls;
1291 if (GNUNET_YES == ve->copied)
1292 return 0; /* terminate */
1293 ve->copied = GNUNET_YES;
1294 return GNUNET_HELLO_add_address (ve->address, ve->valid_until, buf, max);
1299 * We've received a PONG. Check if it matches a pending PING and
1300 * mark the respective address as confirmed.
1302 * @param sender peer sending the PONG
1303 * @param hdr the PONG
1304 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1307 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1308 const struct GNUNET_MessageHeader *hdr)
1310 const struct TransportPongMessage *pong;
1311 struct ValidationEntry *ve;
1317 struct GNUNET_HELLO_Message *hello;
1318 struct GNUNET_HELLO_Address address;
1322 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1324 GNUNET_break_op (0);
1325 return GNUNET_SYSERR;
1327 GNUNET_STATISTICS_update (GST_stats,
1328 gettext_noop ("# PONG messages received"), 1,
1331 /* message with structure:
1332 * [TransportPongMessage][Transport name][Address] */
1334 pong = (const struct TransportPongMessage *) hdr;
1335 tname = (const char *) &pong[1];
1336 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1337 addr = memchr (tname, '\0', size);
1340 GNUNET_break_op (0);
1341 return GNUNET_SYSERR;
1344 slen = strlen (tname) + 1;
1345 addrlen = size - slen;
1346 address.peer = *sender;
1347 address.address = addr;
1348 address.address_length = addrlen;
1349 address.transport_name = tname;
1350 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1351 ve = find_validation_entry (NULL, &address);
1352 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1354 GNUNET_STATISTICS_update (GST_stats,
1356 ("# PONGs dropped, no matching pending validation"),
1360 /* now check that PONG is well-formed */
1361 if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
1363 GNUNET_break_op (0);
1364 return GNUNET_SYSERR;
1366 if (GNUNET_TIME_absolute_get_remaining
1367 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us == 0)
1369 GNUNET_STATISTICS_update (GST_stats,
1371 ("# PONGs dropped, signature expired"), 1,
1373 return GNUNET_SYSERR;
1376 sig_res = GNUNET_SYSERR;
1377 do_verify = GNUNET_YES;
1378 if (0 != GNUNET_TIME_absolute_get_remaining(ve->pong_sig_valid_until).rel_value_us)
1380 /* We have a cached and valid signature for this peer,
1381 * try to compare instead of verify */
1382 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1384 /* signatures are identical, we can skip verification */
1385 sig_res = GNUNET_OK;
1386 do_verify = GNUNET_NO;
1390 sig_res = GNUNET_SYSERR;
1391 /* signatures do not match, we have to verify */
1395 if (GNUNET_YES == do_verify)
1397 /* Do expensive verification */
1398 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1399 &pong->purpose, &pong->signature,
1401 if (sig_res == GNUNET_SYSERR)
1403 GNUNET_break_op (0);
1404 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1405 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1407 GST_plugins_a2s (ve->address),
1408 GNUNET_i2s (sender));
1411 if (sig_res == GNUNET_SYSERR)
1413 GNUNET_break_op (0);
1414 return GNUNET_SYSERR;
1417 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1418 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1419 GNUNET_i2s (sender), tname, GST_plugins_a2s (ve->address));
1420 /* validity achieved, remember it! */
1421 ve->expecting_pong = GNUNET_NO;
1422 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1423 ve->pong_sig_cache = pong->signature;
1424 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1425 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1427 struct GNUNET_ATS_Information ats[2];
1429 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1430 ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
1431 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1432 ats[1].value = htonl ((uint32_t) ve->network);
1433 GNUNET_ATS_address_add (GST_ats, ve->address, NULL, ats, 2);
1435 if (validations_running > 0)
1437 validations_running --;
1438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1439 "Validation finished, %u validation processes running\n",
1440 validations_running);
1447 /* Notify about new validity */
1448 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1450 /* build HELLO to store in PEERINFO */
1451 ve->copied = GNUNET_NO;
1452 hello = GNUNET_HELLO_create (&ve->public_key,
1453 &add_valid_peer_address, ve,
1455 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1456 GNUNET_free (hello);
1462 * We've received a HELLO, check which addresses are new and trigger
1465 * @param hello the HELLO we received
1466 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1469 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1471 const struct GNUNET_HELLO_Message *hm =
1472 (const struct GNUNET_HELLO_Message *) hello;
1473 struct ValidateAddressContext vac;
1474 struct GNUNET_HELLO_Message *h;
1477 friend = GNUNET_HELLO_is_friend_only (hm);
1478 if ( ( (GNUNET_YES != friend) &&
1479 (GNUNET_NO != friend) ) ||
1480 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
1481 (GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
1483 /* malformed HELLO */
1484 GNUNET_break_op (0);
1485 return GNUNET_SYSERR;
1488 memcmp (&GST_my_identity, &vac.pid, sizeof (struct GNUNET_PeerIdentity)))
1490 /* Add peer identity without addresses to peerinfo service */
1491 h = GNUNET_HELLO_create (&vac.public_key, NULL, NULL, friend);
1492 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1493 _("Validation received new %s message for peer `%s' with size %u\n"),
1495 GNUNET_i2s (&vac.pid),
1496 ntohs (hello->size));
1497 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1500 _("Adding `%s' without addresses for peer `%s'\n"), "HELLO",
1501 GNUNET_i2s (&vac.pid));
1504 GNUNET_assert (NULL ==
1505 GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
1506 &validate_address_iterator,
1513 * Closure for #iterate_addresses().
1515 struct IteratorContext
1518 * Function to call on each address.
1520 GST_ValidationAddressCallback cb;
1523 * Closure for @e cb.
1531 * Call the callback in the closure for each validation entry.
1533 * @param cls the `struct IteratorContext`
1534 * @param key the peer's identity
1535 * @param value the `struct ValidationEntry`
1536 * @return #GNUNET_OK (continue to iterate)
1539 iterate_addresses (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
1541 struct IteratorContext *ic = cls;
1542 struct ValidationEntry *ve = value;
1544 ic->cb (ic->cb_cls, &ve->public_key, ve->valid_until, ve->revalidation_block,
1551 * Call the given function for each address for the given target.
1552 * Can either give a snapshot (synchronous API) or be continuous.
1554 * @param target peer information is requested for
1555 * @param cb function to call; will not be called after this function returns
1556 * @param cb_cls closure for 'cb'
1559 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1560 GST_ValidationAddressCallback cb, void *cb_cls)
1562 struct IteratorContext ic;
1566 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1568 &iterate_addresses, &ic);
1573 * Update if we are using an address for a connection actively right now.
1574 * Based on this, the validation module will measure latency for the
1575 * address more or less often.
1577 * @param address the address
1578 * @param session the session
1579 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1580 * #GNUNET_NO if we are no longer using the address for a connection
1583 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1584 struct Session *session,
1587 struct ValidationEntry *ve;
1589 if (NULL != address)
1590 ve = find_validation_entry (NULL, address);
1592 ve = NULL; /* FIXME: lookup based on session... */
1595 /* this can happen for inbound connections (sender_address_len == 0); */
1598 if (ve->in_use == in_use)
1601 if (GNUNET_YES == in_use)
1603 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1604 "Error setting address in use for peer `%s' `%s' to USED\n",
1605 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
1607 if (GNUNET_NO == in_use)
1609 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1610 "Error setting address in use for peer `%s' `%s' to NOT_USED\n",
1611 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
1615 GNUNET_break (ve->in_use != in_use); /* should be different... */
1616 ve->in_use = in_use;
1617 if (in_use == GNUNET_YES)
1619 /* from now on, higher frequeny, so reschedule now */
1620 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1621 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1627 * Query validation about the latest observed latency on a given
1630 * @param sender peer
1631 * @param address the address
1632 * @param session session
1633 * @return observed latency of the address, FOREVER if the address was
1634 * never successfully validated
1636 struct GNUNET_TIME_Relative
1637 GST_validation_get_address_latency (const struct GNUNET_PeerIdentity *sender,
1638 const struct GNUNET_HELLO_Address *address,
1639 struct Session *session)
1641 struct ValidationEntry *ve;
1643 if (NULL == address)
1645 GNUNET_break (0); // FIXME: support having latency only with session...
1646 return GNUNET_TIME_UNIT_FOREVER_REL;
1648 ve = find_validation_entry (NULL, address);
1650 return GNUNET_TIME_UNIT_FOREVER_REL;
1655 * Closure for the validation_entries_iterate function.
1657 struct ValidationIteratorContext
1660 * Function to call on each validation entry
1662 GST_ValidationChangedCallback cb;
1671 validation_entries_iterate (void *cls,
1672 const struct GNUNET_PeerIdentity *key,
1675 struct ValidationIteratorContext *ic = cls;
1676 struct ValidationEntry *ve = value;
1678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Notifying about validation entry for peer `%s' address `%s' \n",
1679 GNUNET_i2s (&ve->pid), GST_plugins_a2s (ve->address));
1680 ic->cb (ic->cb_cls, &ve->pid, ve->address, ve->send_time,
1681 ve->valid_until, ve->next_validation, ve->state);
1687 * Iterate over all iteration entries
1689 * @param cb function to call
1690 * @param cb_cls closure for cb
1693 GST_validation_iterate (GST_ValidationChangedCallback cb, void *cb_cls)
1695 struct ValidationIteratorContext ic;
1697 if (NULL == validation_map)
1698 return; /* can happen during shutdown */
1701 GNUNET_CONTAINER_multipeermap_iterate (validation_map, &validation_entries_iterate, &ic);
1704 /* end of file gnunet-service-transport_validation.c */