2 This file is part of GNUnet.
3 (C) 2010,2011 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.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_ats_service.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_signatures.h"
37 // TODO: observe latency between PING/PONG and give information to ATS!
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 long before an existing address expires should we again try to
57 * validate it? Must be (significantly) smaller than
58 * HELLO_ADDRESS_EXPIRATION.
60 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
63 * Size of the validation map hashmap.
65 #define VALIDATION_MAP_SIZE 256
68 * Priority to use for PINGs
70 #define PING_PRIORITY 2
73 * Priority to use for PONGs
75 #define PONG_PRIORITY 4
79 * Message used to ask a peer to validate receipt (to check an address
80 * from a HELLO). Followed by the address we are trying to validate,
81 * or an empty address if we are just sending a PING to confirm that a
82 * connection which the receiver (of the PING) initiated is still valid.
84 struct TransportPingMessage
88 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
90 struct GNUNET_MessageHeader header;
93 * Challenge code (to ensure fresh reply).
95 uint32_t challenge GNUNET_PACKED;
98 * Who is the intended recipient?
100 struct GNUNET_PeerIdentity target;
106 * Message used to validate a HELLO. The challenge is included in the
107 * confirmation to make matching of replies to requests possible. The
108 * signature signs our public key, an expiration time and our address.<p>
110 * This message is followed by our transport address that the PING tried
111 * to confirm (if we liked it). The address can be empty (zero bytes)
112 * if the PING had not address either (and we received the request via
113 * a connection that we initiated).
115 struct TransportPongMessage
119 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
121 struct GNUNET_MessageHeader header;
124 * Challenge code from PING (showing freshness). Not part of what
125 * is signed so that we can re-use signatures.
127 uint32_t challenge GNUNET_PACKED;
132 struct GNUNET_CRYPTO_RsaSignature signature;
135 * What are we signing and why? Two possible reason codes can be here:
136 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
137 * plausible address for this peer (pid is set to identity of signer); or
138 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
139 * an address we used to connect to the peer with the given pid.
141 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
144 * When does this signature expire?
146 struct GNUNET_TIME_AbsoluteNBO expiration;
149 * Either the identity of the peer Who signed this message, or the
150 * identity of the peer that we're connected to using the given
151 * address (depending on purpose.type).
153 struct GNUNET_PeerIdentity pid;
156 * Size of address appended to this message (part of what is
157 * being signed, hence not redundant).
159 uint32_t addrlen GNUNET_PACKED;
165 * Information about an address under validation
167 struct ValidationEntry
171 * Name of the transport.
173 char *transport_name;
176 * The address, actually a pointer to the end
177 * of this struct. Do not free!
182 * Handle to the blacklist check (if we're currently in it).
184 struct GST_BlacklistCheck *bc;
187 * Public key of the peer.
189 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
192 * The identity of the peer.
194 struct GNUNET_PeerIdentity pid;
197 * ID of task that will clean up this entry if nothing happens.
199 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
202 * At what time did we send the latest validation request?
204 struct GNUNET_TIME_Absolute send_time;
207 * Until when is this address valid?
208 * ZERO if it is not currently considered valid.
210 struct GNUNET_TIME_Absolute valid_until;
213 * How long until we can try to validate this address again?
214 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
215 * ZERO if the address is considered valid (no validation needed)
216 * otherwise a time in the future if we're currently denying re-validation
218 struct GNUNET_TIME_Absolute validation_block;
221 * Challenge number we used.
234 * Context of currently active requests to peerinfo
235 * for validation of HELLOs.
237 struct CheckHelloValidatedContext
241 * This is a doubly-linked list.
243 struct CheckHelloValidatedContext *next;
246 * This is a doubly-linked list.
248 struct CheckHelloValidatedContext *prev;
251 * Hello that we are validating.
253 const struct GNUNET_HELLO_Message *hello;
259 * Head of linked list of HELLOs awaiting validation.
261 static struct CheckHelloValidatedContext *chvc_head;
264 * Tail of linked list of HELLOs awaiting validation
266 static struct CheckHelloValidatedContext *chvc_tail;
269 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
270 * of the given peer that we are currently validating, have validated
271 * or are blocked from re-validation for a while).
273 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
276 * Context for peerinfo iteration.
278 static struct GNUNET_PEERINFO_NotifyContext *pnc;
282 * Context for the validation entry match function.
284 struct ValidationEntryMatchContext
287 * Where to store the result?
289 struct ValidationEntry *ve;
292 * Transport name we're looking for.
294 const char *transport_name;
297 * Address we're interested in.
302 * Number of bytes in 'addr'.
309 * Iterate over validation entries until a matching one is found.
311 * @param cls the 'struct ValidationEntryMatchContext'
312 * @param key peer identity (unused)
313 * @param value a 'struct ValidationEntry' to match
314 * @return GNUNET_YES if the entry does not match,
315 * GNUNET_NO if the entry does match
318 validation_entry_match (void *cls,
319 const GNUNET_HashCode *key,
322 struct ValidationEntryMatchContext *vemc = cls;
323 struct ValidationEntry *ve = value;
325 if ( (ve->addrlen == vemc->addrlen) &&
326 (0 == memcmp (ve->addr, vemc->addr, ve->addrlen)) &&
327 (0 == strcmp (ve->transport_name, vemc->transport_name)) )
337 * Find a ValidationEntry entry for the given neighbour that matches
338 * the given address and transport. If none exists, create one (but
339 * without starting any validation).
341 * @param public_key public key of the peer, NULL for unknown
342 * @param neighbour which peer we care about
343 * @param tname name of the transport plugin
344 * @param session session to look for, NULL for 'any'; otherwise
345 * can be used for the service to "learn" this session ID
347 * @param addr binary address
348 * @param addrlen length of addr
349 * @return validation entry matching the given specifications, NULL
350 * if we don't have an existing entry and no public key was given
352 static struct ValidationEntry *
353 find_validation_entry (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
354 const struct GNUNET_PeerIdentity *neighbour,
359 struct ValidationEntryMatchContext vemc;
360 struct ValidationEntry *ve;
363 vemc.transport_name = tname;
365 vemc.addrlen = addrlen;
366 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
367 &neighbour->hashPubKey,
368 &validation_entry_match,
370 if (NULL != (ve = vemc.ve))
372 if (public_key == NULL)
374 ve = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
375 ve->transport_name = GNUNET_strdup (tname);
376 ve->addr = (void*) &ve[1];
377 ve->public_key = *public_key;
378 ve->pid = *neighbour;
379 ve->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
381 memcpy (&ve[1], addr, addrlen);
382 ve->addrlen = addrlen;
383 GNUNET_CONTAINER_multihashmap_put (validation_map,
384 &neighbour->hashPubKey,
386 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
392 * Iterator which adds the given address to the set of validated
395 * @param cls original HELLO message
396 * @param tname name of the transport
397 * @param expiration expiration time
398 * @param addr the address
399 * @param addrlen length of the address
400 * @return GNUNET_OK (keep the address)
403 add_valid_address (void *cls,
405 struct GNUNET_TIME_Absolute expiration,
409 const struct GNUNET_HELLO_Message *hello = cls;
410 struct ValidationEntry *ve;
411 struct GNUNET_PeerIdentity pid;
412 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
414 if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
415 return GNUNET_OK; /* expired */
417 GNUNET_HELLO_get_id (hello, &pid)) ||
419 GNUNET_HELLO_get_key (hello, &public_key)) )
422 return GNUNET_OK; /* invalid HELLO !? */
424 ve = find_validation_entry (&public_key, &pid, tname, addr, addrlen);
425 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until,
427 GNUNET_ATS_address_update (GST_ats,
440 * Function called for any HELLO known to PEERINFO.
443 * @param peer id of the peer, NULL for last call
444 * @param hello hello message for the peer (can be NULL)
445 * @param error message
448 process_peerinfo_hello (void *cls,
449 const struct GNUNET_PeerIdentity *peer,
450 const struct GNUNET_HELLO_Message *hello,
453 GNUNET_assert (NULL != peer);
456 GNUNET_assert (NULL ==
457 GNUNET_HELLO_iterate_addresses (hello,
465 * Start the validation subsystem.
468 GST_validation_start ()
470 validation_map = GNUNET_CONTAINER_multihashmap_create (VALIDATION_MAP_SIZE);
471 pnc = GNUNET_PEERINFO_notify (GST_cfg,
472 &process_peerinfo_hello,
478 * Iterate over validation entries and free them.
480 * @param cls (unused)
481 * @param key peer identity (unused)
482 * @param value a 'struct ValidationEntry' to clean up
483 * @return GNUNET_YES (continue to iterate)
486 cleanup_validation_entry (void *cls,
487 const GNUNET_HashCode *key,
490 struct ValidationEntry *ve = value;
494 GST_blacklist_test_cancel (ve->bc);
497 GNUNET_break (GNUNET_OK ==
498 GNUNET_CONTAINER_multihashmap_remove (validation_map,
501 GNUNET_free (ve->transport_name);
502 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
504 GNUNET_SCHEDULER_cancel (ve->timeout_task);
505 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
513 * Stop the validation subsystem.
516 GST_validation_stop ()
518 struct CheckHelloValidatedContext *chvc;
520 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
521 &cleanup_validation_entry,
523 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
524 validation_map = NULL;
525 while (NULL != (chvc = chvc_head))
527 GNUNET_CONTAINER_DLL_remove (chvc_head,
532 GNUNET_PEERINFO_notify_cancel (pnc);
537 * Address validation cleanup task (record no longer needed).
539 * @param cls the 'struct ValidationEntry'
540 * @param tc scheduler context (unused)
543 timeout_hello_validation (void *cls,
544 const struct GNUNET_SCHEDULER_TaskContext *tc)
546 struct ValidationEntry *ve = cls;
548 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
549 GNUNET_STATISTICS_update (GST_stats,
550 gettext_noop ("# address records discarded"),
553 cleanup_validation_entry (NULL, &ve->pid.hashPubKey, ve);
558 * Send the given PONG to the given address.
560 * @param cls the PONG message
561 * @param public_key public key for the peer, never NULL
562 * @param target peer this change is about, never NULL
563 * @param valid_until is ZERO if we never validated the address,
564 * otherwise a time up to when we consider it (or was) valid
565 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
566 * is ZERO if the address is considered valid (no validation needed)
567 * otherwise a time in the future if we're currently denying re-validation
568 * @param plugin_name name of the plugin
569 * @param plugin_address binary address
570 * @param plugin_address_len length of address
573 multicast_pong (void *cls,
574 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
575 const struct GNUNET_PeerIdentity *target,
576 struct GNUNET_TIME_Absolute valid_until,
577 struct GNUNET_TIME_Absolute validation_block,
578 const char *plugin_name,
579 const void *plugin_address,
580 size_t plugin_address_len)
582 struct TransportPongMessage *pong = cls;
583 struct GNUNET_TRANSPORT_PluginFunctions *papi;
585 papi = GST_plugins_find (plugin_name);
588 (void) papi->send (papi->cls,
591 ntohs (pong->header.size),
593 HELLO_REVALIDATION_START_TIME,
603 * We've received a PING. If appropriate, generate a PONG.
605 * @param sender peer sending the PING
606 * @param hdr the PING
607 * @param session session we got the PING from
608 * @param plugin_name name of plugin that received the PING
609 * @param sender_address address of the sender as known to the plugin, NULL
610 * if we did not initiate the connection
611 * @param sender_address_len number of bytes in sender_address
614 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
615 const struct GNUNET_MessageHeader *hdr,
616 const char *plugin_name,
617 struct Session *session,
618 const void *sender_address,
619 size_t sender_address_len)
621 const struct TransportPingMessage *ping;
622 struct TransportPongMessage *pong;
623 struct GNUNET_TRANSPORT_PluginFunctions *papi;
624 struct GNUNET_CRYPTO_RsaSignature *sig_cache;
625 struct GNUNET_TIME_Absolute *sig_cache_exp;
632 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
637 ping = (const struct TransportPingMessage *) hdr;
638 if (0 != memcmp (&ping->target,
640 sizeof (struct GNUNET_PeerIdentity)))
645 GNUNET_STATISTICS_update (GST_stats,
646 gettext_noop ("# PING messages received"),
649 addr = (const char*) &ping[1];
650 alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
651 /* peer wants to confirm that this is one of our addresses, this is what is
652 used for address validation */
654 addrend = memchr (addr, '\0', alen);
665 GST_hello_test_address (addr,
671 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
672 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
673 GST_plugins_a2s (addr,
679 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
680 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
681 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
683 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
685 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
686 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
687 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
688 pong->challenge = ping->challenge;
689 pong->addrlen = htonl(alen + slen);
690 pong->pid = GST_my_identity;
691 memcpy (&pong[1], addr, slen);
692 memcpy (&((char*)&pong[1])[slen], addrend, alen);
693 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
695 /* create / update cached sig */
697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
698 "Creating PONG signature to indicate ownership.\n");
700 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
701 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
702 GNUNET_assert (GNUNET_OK ==
703 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
709 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
711 pong->signature = *sig_cache;
713 /* first see if the session we got this PING from can be used to transmit
714 a response reliably */
715 papi = GST_plugins_find (plugin_name);
719 ret = papi->send (papi->cls,
722 ntohs (pong->header.size),
724 HELLO_REVALIDATION_START_TIME,
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
733 "Transmitted PONG to `%s' via reliable mechanism\n",
734 GNUNET_i2s (sender));
736 GNUNET_STATISTICS_update (GST_stats,
737 gettext_noop ("# PONGs unicast via reliable transport"),
744 /* no reliable method found, try transmission via all known addresses */
745 GNUNET_STATISTICS_update (GST_stats,
746 gettext_noop ("# PONGs multicast to all available addresses"),
749 GST_validation_get_addresses (sender,
757 * Context for the 'validate_address' function
759 struct ValidateAddressContext
762 * Hash of the public key of the peer whose address is being validated.
764 struct GNUNET_PeerIdentity pid;
767 * Public key of the peer whose address is being validated.
769 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
774 * Function called with the result from blacklisting.
775 * Send a PING to the other peer if a communication is allowed.
777 * @param cls ou r'struct ValidationEntry'
778 * @param pid identity of the other peer
779 * @param result GNUNET_OK if the connection is allowed, GNUNET_NO if not
782 transmit_ping_if_allowed (void *cls,
783 const struct GNUNET_PeerIdentity *pid,
786 struct ValidationEntry *ve = cls;
787 struct TransportPingMessage ping;
788 struct GNUNET_TRANSPORT_PluginFunctions *papi;
789 const struct GNUNET_MessageHeader *hello;
796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
797 "Transmitting plain PING to `%s'\n",
799 ping.header.size = htons(sizeof(struct TransportPingMessage));
800 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
801 ping.challenge = htonl(ve->challenge);
804 slen = strlen(ve->transport_name) + 1;
805 hello = GST_hello_get ();
806 hsize = ntohs (hello->size);
807 tsize = sizeof(struct TransportPingMessage) + ve->addrlen + slen + hsize;
808 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
810 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
811 _("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
814 (unsigned int) tsize);
815 /* message too big (!?), get rid of HELLO */
817 tsize = sizeof(struct TransportPingMessage) + ve->addrlen + slen + hsize;
820 char message_buf[tsize];
822 memcpy(message_buf, hello, hsize);
823 memcpy(&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
824 memcpy(&message_buf[sizeof (struct TransportPingMessage) + hsize],
827 memcpy(&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
830 papi = GST_plugins_find (ve->transport_name);
834 ret = papi->send (papi->cls,
839 HELLO_REVALIDATION_START_TIME,
840 NULL /* no session */,
848 ve->send_time = GNUNET_TIME_absolute_get ();
849 GNUNET_STATISTICS_update (GST_stats,
850 gettext_noop ("# PING without HELLO messages sent"),
858 * Iterator callback to go over all addresses and try to validate them
859 * (unless blocked or already validated).
861 * @param cls pointer to a 'struct ValidateAddressContext'
862 * @param tname name of the transport
863 * @param expiration expiration time
864 * @param addr the address
865 * @param addrlen length of the address
866 * @return GNUNET_OK (keep the address)
869 validate_address (void *cls,
871 struct GNUNET_TIME_Absolute expiration,
875 const struct ValidateAddressContext *vac = cls;
876 const struct GNUNET_PeerIdentity *pid = &vac->pid;
877 struct ValidationEntry *ve;
878 struct GST_BlacklistCheck *bc;
880 if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
881 return GNUNET_OK; /* expired */
882 ve = find_validation_entry (&vac->public_key, pid, tname, addr, addrlen);
883 if (GNUNET_TIME_absolute_get_remaining (ve->validation_block).rel_value > 0)
884 return GNUNET_OK; /* blocked */
885 if ( (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task) &&
886 (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value > 0) )
887 return GNUNET_OK; /* revalidation task already scheduled & still valid */
888 ve->validation_block = GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME);
889 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
890 GNUNET_SCHEDULER_cancel (ve->timeout_task);
891 ve->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_REVALIDATION_START_TIME,
892 &timeout_hello_validation,
894 bc = GST_blacklist_test_allowed (pid,
896 &transmit_ping_if_allowed,
905 * Do address validation again to keep address valid.
907 * @param cls the 'struct ValidationEntry'
908 * @param tc scheduler context (unused)
911 revalidate_address (void *cls,
912 const struct GNUNET_SCHEDULER_TaskContext *tc)
914 struct ValidationEntry *ve = cls;
915 struct GNUNET_TIME_Relative delay;
916 struct ValidateAddressContext vac;
918 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
919 delay = GNUNET_TIME_absolute_get_remaining (ve->validation_block);
920 if (delay.rel_value > 0)
922 /* should wait a bit longer */
923 ve->timeout_task = GNUNET_SCHEDULER_add_delayed (delay,
928 GNUNET_STATISTICS_update (GST_stats,
929 gettext_noop ("# address revalidations started"),
933 vac.public_key = ve->public_key;
934 validate_address (&vac,
938 (uint16_t) ve->addrlen);
943 * Add the validated peer address to the HELLO.
945 * @param cls the 'struct ValidationEntry' with the validated address
946 * @param max space in buf
947 * @param buf where to add the address
950 add_valid_peer_address (void *cls,
954 struct ValidationEntry *ve = cls;
956 return GNUNET_HELLO_add_address (ve->transport_name,
966 * We've received a PONG. Check if it matches a pending PING and
967 * mark the respective address as confirmed.
969 * @param sender peer sending the PONG
970 * @param hdr the PONG
973 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
974 const struct GNUNET_MessageHeader *hdr)
976 const struct TransportPongMessage *pong;
977 struct ValidationEntry *ve;
983 struct GNUNET_TIME_Relative delay;
984 struct GNUNET_HELLO_Message *hello;
986 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
991 GNUNET_STATISTICS_update (GST_stats,
992 gettext_noop ("# PONG messages received"),
995 pong = (const struct TransportPongMessage *) hdr;
996 if (0 != memcmp (&pong->pid,
998 sizeof (struct GNUNET_PeerIdentity)))
1000 GNUNET_break_op (0);
1003 addr = (const char*) &pong[1];
1004 alen = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1005 addrend = memchr (addr, '\0', alen);
1006 if (NULL == addrend)
1008 GNUNET_break_op (0);
1012 slen = strlen(addr);
1014 ve = find_validation_entry (NULL,
1021 GNUNET_STATISTICS_update (GST_stats,
1022 gettext_noop ("# PONGs dropped, no matching pending validation"),
1027 /* now check that PONG is well-formed */
1028 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
1030 GNUNET_STATISTICS_update (GST_stats,
1031 gettext_noop ("# PONGs dropped, signature expired"),
1037 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1042 GNUNET_break_op (0);
1046 /* validity achieved, remember it! */
1047 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1048 GNUNET_ATS_address_update (GST_ats,
1055 NULL, 0); /* FIXME: compute and add latency here... */
1057 /* build HELLO to store in PEERINFO */
1058 hello = GNUNET_HELLO_create (&ve->public_key,
1059 &add_valid_peer_address,
1061 GNUNET_PEERINFO_add_peer (GST_peerinfo,
1063 GNUNET_free (hello);
1065 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
1066 GNUNET_SCHEDULER_cancel (ve->timeout_task);
1068 /* randomly delay by up to 1h to avoid synchronous validations */
1069 rdelay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1071 delay = GNUNET_TIME_relative_add (HELLO_REVALIDATION_START_TIME,
1072 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
1074 ve->timeout_task = GNUNET_SCHEDULER_add_delayed (delay,
1075 &revalidate_address,
1081 * We've received a HELLO, check which addresses are new and trigger
1084 * @param hello the HELLO we received
1087 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1089 const struct GNUNET_HELLO_Message* hm = (const struct GNUNET_HELLO_Message*) hello;
1090 struct ValidateAddressContext vac;
1093 GNUNET_HELLO_get_id (hm, &vac.pid)) ||
1095 GNUNET_HELLO_get_key (hm, &vac.public_key)) )
1097 /* malformed HELLO */
1101 GNUNET_assert (NULL ==
1102 GNUNET_HELLO_iterate_addresses (hm,
1110 * Closure for 'iterate_addresses'
1112 struct IteratorContext
1115 * Function to call on each address.
1117 GST_ValidationAddressCallback cb;
1128 * Call the callback in the closure for each validation entry.
1130 * @param cls the 'struct GST_ValidationIteratorContext'
1131 * @param key the peer's identity
1132 * @param value the 'struct ValidationEntry'
1133 * @return GNUNET_OK (continue to iterate)
1136 iterate_addresses (void *cls,
1137 const GNUNET_HashCode *key,
1140 struct IteratorContext *ic = cls;
1141 struct ValidationEntry *ve = value;
1147 ve->validation_block,
1156 * Call the given function for each address for the given target.
1157 * Can either give a snapshot (synchronous API) or be continuous.
1159 * @param target peer information is requested for
1160 * @param snapshot_only GNUNET_YES to iterate over addresses once, GNUNET_NO to
1161 * continue to give information about addresses as it evolves
1162 * @param cb function to call; will not be called after this function returns
1163 * if snapshot_only is GNUNET_YES
1164 * @param cb_cls closure for 'cb'
1165 * @return context to cancel, NULL if 'snapshot_only' is GNUNET_YES
1168 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1169 GST_ValidationAddressCallback cb,
1172 struct IteratorContext ic;
1176 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
1177 &target->hashPubKey,
1183 /* end of file gnunet-service-transport_validation.c */