2 This file is part of GNUnet.
3 Copyright (C) 2010, 2012, 2017 Christian Grothoff
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
21 * @file pt/gnunet-daemon-pt.c
22 * @brief tool to manipulate DNS and VPN services to perform protocol translation (IPvX over GNUnet)
23 * @author Christian Grothoff
26 #include "gnunet_util_lib.h"
27 #include "gnunet_dns_service.h"
28 #include "gnunet_dnsparser_lib.h"
29 #include "gnunet_cadet_service.h"
30 #include "gnunet_tun_lib.h"
31 #include "gnunet_dht_service.h"
32 #include "gnunet_vpn_service.h"
33 #include "gnunet_statistics_service.h"
34 #include "gnunet_applications.h"
35 #include "block_dns.h"
39 * After how long do we time out if we could not get an IP from VPN or CADET?
41 #define TIMEOUT GNUNET_TIME_UNIT_MINUTES
44 * How many bytes of payload do we allow at most for a DNS reply?
45 * Given that this is pretty much limited to loopback, we can be
46 * pretty high (Linux loopback defaults to 16k, most local UDP packets
47 * should survive up to 9k (NFS), so 8k should be pretty safe in
50 #define MAX_DNS_SIZE (8 * 1024)
53 * How many channels do we open at most at the same time?
55 #define MAX_OPEN_TUNNELS 4
59 * Which group of DNS records are we currently processing?
69 * DNS authority records
71 AUTHORITY_RECORDS = 1,
74 * DNS additional records
76 ADDITIONAL_RECORDS = 2,
79 * We're done processing.
86 * Information tracked per DNS reply that we are processing.
91 * Handle to submit the final result.
93 struct GNUNET_DNS_RequestHandle *rh;
96 * DNS packet that is being modified.
98 struct GNUNET_DNSPARSER_Packet *dns;
101 * Active redirection request with the VPN.
103 struct GNUNET_VPN_RedirectionRequest *rr;
106 * Record for which we have an active redirection request.
108 struct GNUNET_DNSPARSER_Record *rec;
111 * Offset in the current record group that is being modified.
116 * Group that is being modified
118 enum RequestGroup group;
123 * Handle to a peer that advertised that it is willing to serve
124 * as a DNS exit. We try to keep a few channels open and a few
132 struct CadetExit *next;
137 struct CadetExit *prev;
140 * Channel we use for DNS requests over CADET, NULL if we did
141 * not initialze a channel to this peer yet.
143 struct GNUNET_CADET_Channel *cadet_channel;
146 * At what time did the peer's advertisement expire?
148 struct GNUNET_TIME_Absolute expiration;
151 * Head of DLL of requests waiting for a response.
153 struct RequestContext *receive_queue_head;
156 * Tail of DLL of requests waiting for a response.
158 struct RequestContext *receive_queue_tail;
161 * Identity of the peer that is providing the exit for us.
163 struct GNUNET_PeerIdentity peer;
166 * How many DNS requests did we transmit via this channel?
168 unsigned int num_transmitted;
171 * How many DNS requests were answered via this channel?
173 unsigned int num_answered;
176 * Size of the window, 0 if we are busy.
178 /* unsigned */ int idle;
183 * State we keep for a request that is going out via CADET.
185 struct RequestContext
188 * We keep these in a DLL.
190 struct RequestContext *next;
193 * We keep these in a DLL.
195 struct RequestContext *prev;
198 * Exit that was chosen for this request.
200 struct CadetExit *exit;
203 * Handle for interaction with DNS service.
205 struct GNUNET_DNS_RequestHandle *rh;
208 * Envelope with the request we are transmitting.
210 struct GNUNET_MQ_Envelope *env;
213 * Task used to abort this operation with timeout.
215 struct GNUNET_SCHEDULER_Task *timeout_task;
218 * Length of the request message that follows this struct.
223 * ID of the original DNS request (used to match the reply).
230 * Head of DLL of cadet exits. Cadet exits with an open channel are
231 * always at the beginning (so we do not have to traverse the entire
232 * list to find them).
234 static struct CadetExit *exit_head;
237 * Tail of DLL of cadet exits.
239 static struct CadetExit *exit_tail;
242 * The handle to the configuration used throughout the process
244 static const struct GNUNET_CONFIGURATION_Handle *cfg;
247 * The handle to the VPN
249 static struct GNUNET_VPN_Handle *vpn_handle;
252 * The handle to the CADET service
254 static struct GNUNET_CADET_Handle *cadet_handle;
259 static struct GNUNET_STATISTICS_Handle *stats;
262 * The handle to DNS post-resolution modifications.
264 static struct GNUNET_DNS_Handle *dns_post_handle;
267 * The handle to DNS pre-resolution modifications.
269 static struct GNUNET_DNS_Handle *dns_pre_handle;
272 * Handle to access the DHT.
274 static struct GNUNET_DHT_Handle *dht;
277 * Our DHT GET operation to find DNS exits.
279 static struct GNUNET_DHT_GetHandle *dht_get;
282 * Are we doing IPv4-pt?
287 * Are we doing IPv6-pt?
292 * Are we channeling DNS queries?
294 static int dns_channel;
297 * Number of DNS exit peers we currently have in the cadet channel.
298 * Used to see if using the cadet channel makes any sense right now,
299 * as well as to decide if we should open new channels.
301 static unsigned int dns_exit_available;
305 * We are short on cadet exits, try to open another one.
308 try_open_exit (void);
312 * Compute the weight of the given exit. The higher the weight,
313 * the more likely it will be that the channel will be chosen.
314 * A weigt of zero means that we should close the channel as it
315 * is so bad, that we should not use it.
317 * @param exit exit to calculate the weight for
318 * @return weight of the channel
321 get_channel_weight (struct CadetExit *exit)
324 uint32_t drop_percent;
325 uint32_t good_percent;
327 GNUNET_assert (exit->num_transmitted >= exit->num_answered);
328 dropped = exit->num_transmitted - exit->num_answered;
329 if (exit->num_transmitted > 0)
330 drop_percent = (uint32_t) ((100LL * dropped) / exit->num_transmitted);
332 drop_percent = 50; /* no data */
333 if ((exit->num_transmitted > 20) &&
335 return 0; /* statistically significant, and > 25% loss, die */
336 good_percent = 100 - drop_percent;
337 GNUNET_assert (0 != good_percent);
338 if (UINT32_MAX / good_percent / good_percent < exit->num_transmitted)
339 return UINT32_MAX; /* formula below would overflow */
340 return 1 + good_percent * good_percent * exit->num_transmitted;
345 * Choose a cadet exit for a DNS request. We try to use a channel
346 * that is reliable and currently available. All existing
347 * channels are given a base weight of 1, plus a score relating
348 * to the total number of queries answered in relation to the
349 * total number of queries we sent to that channel. That
350 * score is doubled if the channel is currently idle.
352 * @return NULL if no exit is known, otherwise the
353 * exit that we should use to queue a message with
355 static struct CadetExit *
358 struct CadetExit *pos;
359 uint64_t total_transmitted;
360 uint64_t selected_offset;
361 uint32_t channel_weight;
363 total_transmitted = 0;
364 for (pos = exit_head; NULL != pos; pos = pos->next)
366 if (NULL == pos->cadet_channel)
368 channel_weight = get_channel_weight (pos);
369 total_transmitted += channel_weight;
370 /* double weight for idle channels */
372 total_transmitted += channel_weight;
374 if (0 == total_transmitted)
376 /* no channels available, or only a very bad one... */
379 selected_offset = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
381 total_transmitted = 0;
382 for (pos = exit_head; NULL != pos; pos = pos->next)
384 if (NULL == pos->cadet_channel)
386 channel_weight = get_channel_weight (pos);
387 total_transmitted += channel_weight;
388 /* double weight for idle channels */
390 total_transmitted += channel_weight;
391 if (total_transmitted > selected_offset)
400 * We're done modifying all records in the response. Submit the reply
401 * and free the resources of the rc.
403 * @param rc context to process
406 finish_request (struct ReplyContext *rc)
412 GNUNET_DNSPARSER_pack (rc->dns,
417 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
418 _ ("Failed to pack DNS request. Dropping.\n"));
419 GNUNET_DNS_request_drop (rc->rh);
423 GNUNET_STATISTICS_update (stats,
424 gettext_noop ("# DNS requests mapped to VPN"),
426 GNUNET_DNS_request_answer (rc->rh,
431 GNUNET_DNSPARSER_free_packet (rc->dns);
437 * Process the next record of the given request context.
438 * When done, submit the reply and free the resources of
441 * @param rc context to process
444 submit_request (struct ReplyContext *rc);
448 * Callback invoked from the VPN service once a redirection is
449 * available. Provides the IP address that can now be used to
450 * reach the requested destination. We substitute the active
451 * record and then continue with 'submit_request' to look at
454 * @param cls our `struct ReplyContext`
455 * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
456 * will match 'result_af' from the request
457 * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
458 * that the VPN allocated for the redirection;
459 * traffic to this IP will now be redirected to the
460 * specified target peer; NULL on error
463 vpn_allocation_callback (void *cls,
467 struct ReplyContext *rc = cls;
472 GNUNET_DNS_request_drop (rc->rh);
473 GNUNET_DNSPARSER_free_packet (rc->dns);
477 GNUNET_STATISTICS_update (stats,
478 gettext_noop ("# DNS records modified"),
481 switch (rc->rec->type)
483 case GNUNET_DNSPARSER_TYPE_A:
484 GNUNET_assert (AF_INET == af);
485 GNUNET_memcpy (rc->rec->data.raw.data,
487 sizeof(struct in_addr));
490 case GNUNET_DNSPARSER_TYPE_AAAA:
491 GNUNET_assert (AF_INET6 == af);
492 GNUNET_memcpy (rc->rec->data.raw.data,
494 sizeof(struct in6_addr));
507 * Modify the given DNS record by asking VPN to create a channel
508 * to the given address. When done, continue with submitting
509 * other records from the request context ('submit_request' is
512 * @param rc context to process
513 * @param rec record to modify
516 modify_address (struct ReplyContext *rc,
517 struct GNUNET_DNSPARSER_Record *rec)
523 case GNUNET_DNSPARSER_TYPE_A:
525 GNUNET_assert (rec->data.raw.data_len == sizeof(struct in_addr));
528 case GNUNET_DNSPARSER_TYPE_AAAA:
530 GNUNET_assert (rec->data.raw.data_len == sizeof(struct in6_addr));
538 rc->rr = GNUNET_VPN_redirect_to_ip (vpn_handle,
542 GNUNET_TIME_relative_to_absolute (
544 &vpn_allocation_callback,
550 * Process the next record of the given request context.
551 * When done, submit the reply and free the resources of
554 * @param rc context to process
557 submit_request (struct ReplyContext *rc)
559 struct GNUNET_DNSPARSER_Record *ra;
568 ra = rc->dns->answers;
569 ra_len = rc->dns->num_answers;
572 case AUTHORITY_RECORDS:
573 ra = rc->dns->authority_records;
574 ra_len = rc->dns->num_authority_records;
577 case ADDITIONAL_RECORDS:
578 ra = rc->dns->additional_records;
579 ra_len = rc->dns->num_additional_records;
589 for (i = rc->offset; i < ra_len; i++)
593 case GNUNET_DNSPARSER_TYPE_A:
603 case GNUNET_DNSPARSER_TYPE_AAAA:
620 * Test if any of the given records need protocol-translation work.
622 * @param ra array of records
623 * @param ra_len number of entries in @a ra
624 * @return #GNUNET_YES if any of the given records require protocol-translation
627 work_test (const struct GNUNET_DNSPARSER_Record *ra,
632 for (i = 0; i < ra_len; i++)
636 case GNUNET_DNSPARSER_TYPE_A:
641 case GNUNET_DNSPARSER_TYPE_AAAA:
652 * This function is called AFTER we got an IP address for a
653 * DNS request. Now, the PT daemon has the chance to substitute
654 * the IP address with one from the VPN range to channel requests
655 * destined for this IP address via VPN and CADET.
658 * @param rh request handle to user for reply
659 * @param request_length number of bytes in request
660 * @param request udp payload of the DNS request
663 dns_post_request_handler (void *cls,
664 struct GNUNET_DNS_RequestHandle *rh,
665 size_t request_length,
668 struct GNUNET_DNSPARSER_Packet *dns;
669 struct ReplyContext *rc;
672 GNUNET_STATISTICS_update (stats,
673 gettext_noop ("# DNS replies intercepted"),
675 dns = GNUNET_DNSPARSER_parse (request,
679 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
680 _ ("Failed to parse DNS request. Dropping.\n"));
681 GNUNET_DNS_request_drop (rh);
685 work |= work_test (dns->answers,
687 work |= work_test (dns->authority_records,
688 dns->num_authority_records);
689 work |= work_test (dns->additional_records,
690 dns->num_additional_records);
693 GNUNET_DNS_request_forward (rh);
694 GNUNET_DNSPARSER_free_packet (dns);
697 rc = GNUNET_new (struct ReplyContext);
707 * Task run if the time to answer a DNS request via CADET is over.
709 * @param cls the `struct RequestContext` to abort
712 timeout_request (void *cls)
714 struct RequestContext *rc = cls;
715 struct CadetExit *exit = rc->exit;
717 GNUNET_STATISTICS_update (stats,
718 gettext_noop ("# DNS requests dropped (timeout)"),
721 GNUNET_DNS_request_drop (rc->rh);
723 if ((0 == get_channel_weight (exit)) &&
724 (NULL == exit->receive_queue_head))
726 /* this straw broke the camel's back: this channel now has
727 such a low score that it will not be used; close it! */
728 GNUNET_CADET_channel_destroy (exit->cadet_channel);
729 exit->cadet_channel = NULL;
730 GNUNET_CONTAINER_DLL_remove (exit_head,
733 GNUNET_CONTAINER_DLL_insert_tail (exit_head,
736 /* go back to semi-innocent: mark as not great, but
737 avoid a prohibitively negative score (see
738 #get_channel_weight(), which checks for a certain
739 minimum number of transmissions before making
740 up an opinion) */exit->num_transmitted = 5;
741 exit->num_answered = 0;
742 dns_exit_available--;
743 /* now try to open an alternative exit */
750 * This function is called *before* the DNS request has been
751 * given to a "local" DNS resolver. Channeling for DNS requests
752 * was enabled, so we now need to send the request via some CADET
753 * channel to a DNS EXIT for resolution.
756 * @param rh request handle to user for reply
757 * @param request_length number of bytes in request
758 * @param request udp payload of the DNS request
761 dns_pre_request_handler (void *cls,
762 struct GNUNET_DNS_RequestHandle *rh,
763 size_t request_length,
766 struct RequestContext *rc;
767 struct GNUNET_MQ_Envelope *env;
768 struct GNUNET_MessageHeader *hdr;
769 struct GNUNET_TUN_DnsHeader dns;
770 struct CadetExit *exit;
772 GNUNET_STATISTICS_update (stats,
773 gettext_noop ("# DNS requests intercepted"),
775 if (0 == dns_exit_available)
777 GNUNET_STATISTICS_update (stats,
779 "# DNS requests dropped (DNS cadet channel down)"),
781 GNUNET_DNS_request_drop (rh);
784 if (request_length < sizeof(dns))
786 GNUNET_STATISTICS_update (stats,
788 "# DNS requests dropped (malformed)"),
790 GNUNET_DNS_request_drop (rh);
793 exit = choose_exit ();
794 GNUNET_assert (NULL != exit);
795 GNUNET_assert (NULL != exit->cadet_channel);
797 env = GNUNET_MQ_msg_extra (hdr,
799 GNUNET_MESSAGE_TYPE_VPN_DNS_TO_INTERNET);
800 GNUNET_memcpy (&hdr[1],
803 rc = GNUNET_new (struct RequestContext);
806 rc->timeout_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
814 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
815 exit->receive_queue_tail,
819 exit->num_transmitted++;
820 GNUNET_MQ_send (GNUNET_CADET_get_mq (exit->cadet_channel),
821 GNUNET_MQ_env_copy (env));
825 GNUNET_NETWORK_STRUCT_BEGIN
828 * Message with a DNS response.
830 struct DnsResponseMessage
833 * GNUnet header, of type #GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET
835 struct GNUNET_MessageHeader header;
840 struct GNUNET_TUN_DnsHeader dns;
842 /* Followed by more DNS payload */
845 GNUNET_NETWORK_STRUCT_END
848 * Process a request via cadet to perform a DNS query.
850 * @param cls the `struct CadetExit` which got the message
851 * @param msg the actual message
852 * @return #GNUNET_OK to keep the connection open,
853 * #GNUNET_SYSERR to close it (signal serious error)
856 check_dns_response (void *cls,
857 const struct DnsResponseMessage *msg)
859 return GNUNET_OK; /* all OK */
864 * Process a request via cadet to perform a DNS query.
866 * @param cls the `struct CadetExit` which got the message
867 * @param msg the actual message
870 handle_dns_response (void *cls,
871 const struct DnsResponseMessage *msg)
873 struct CadetExit *exit = cls;
875 struct RequestContext *rc;
877 mlen = ntohs (msg->header.size) - sizeof(*msg);
878 for (rc = exit->receive_queue_head; NULL != rc; rc = rc->next)
880 if (msg->dns.id == rc->dns_id)
882 GNUNET_STATISTICS_update (stats,
883 gettext_noop ("# DNS replies received"),
886 GNUNET_DNS_request_answer (rc->rh,
887 mlen + sizeof(struct GNUNET_TUN_DnsHeader),
888 (const void *) &msg->dns);
889 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
890 exit->receive_queue_tail,
892 GNUNET_SCHEDULER_cancel (rc->timeout_task);
893 GNUNET_MQ_discard (rc->env);
895 exit->num_answered++;
899 GNUNET_STATISTICS_update (stats,
900 gettext_noop ("# DNS replies dropped (too late?)"),
906 * Abort all pending DNS requests with the given cadet exit.
908 * @param exit cadet exit to abort requests for
911 abort_all_requests (struct CadetExit *exit)
913 struct RequestContext *rc;
915 while (NULL != (rc = exit->receive_queue_head))
917 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
918 exit->receive_queue_tail,
920 GNUNET_DNS_request_drop (rc->rh);
921 GNUNET_SCHEDULER_cancel (rc->timeout_task);
922 GNUNET_MQ_discard (rc->env);
929 * Function scheduled as very last function, cleans up after us
931 * @param cls closure, NULL
936 struct CadetExit *exit;
938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
939 "Protocol translation daemon is shutting down now\n");
940 if (NULL != vpn_handle)
942 GNUNET_VPN_disconnect (vpn_handle);
945 while (NULL != (exit = exit_head))
947 GNUNET_CONTAINER_DLL_remove (exit_head,
950 if (NULL != exit->cadet_channel)
952 GNUNET_CADET_channel_destroy (exit->cadet_channel);
953 exit->cadet_channel = NULL;
955 abort_all_requests (exit);
958 if (NULL != cadet_handle)
960 GNUNET_CADET_disconnect (cadet_handle);
963 if (NULL != dns_post_handle)
965 GNUNET_DNS_disconnect (dns_post_handle);
966 dns_post_handle = NULL;
968 if (NULL != dns_pre_handle)
970 GNUNET_DNS_disconnect (dns_pre_handle);
971 dns_pre_handle = NULL;
975 GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
980 GNUNET_DHT_get_stop (dht_get);
985 GNUNET_DHT_disconnect (dht);
992 * Function called whenever a channel is destroyed. Should clean up
993 * the associated state and attempt to build a new one.
995 * It must NOT call #GNUNET_CADET_channel_destroy on the channel.
997 * @param cls closure (the `struct CadetExit` set from #GNUNET_CADET_connect)
998 * @param channel connection to the other end (henceforth invalid)
999 * @param channel_ctx place where local state associated
1000 * with the channel is stored
1003 cadet_channel_end_cb (void *cls,
1004 const struct GNUNET_CADET_Channel *channel)
1006 struct CadetExit *exit = cls;
1007 struct CadetExit *alt;
1008 struct RequestContext *rc;
1010 exit->cadet_channel = NULL;
1011 dns_exit_available--;
1012 /* open alternative channels */
1013 /* our channel is now closed, move our requests to an alternative
1015 alt = choose_exit ();
1016 while (NULL != (rc = exit->receive_queue_head))
1018 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
1019 exit->receive_queue_tail,
1022 GNUNET_CONTAINER_DLL_insert (alt->receive_queue_head,
1023 alt->receive_queue_tail,
1025 GNUNET_MQ_send (GNUNET_CADET_get_mq (alt->cadet_channel),
1026 GNUNET_MQ_env_copy (rc->env));
1033 * Function called whenever a channel has excess capacity.
1035 * @param cls the `struct CadetExit`
1036 * @param channel connection to the other end
1037 * @param window_size how much capacity do we have
1040 channel_idle_notify_cb (void *cls,
1041 const struct GNUNET_CADET_Channel *channel,
1044 struct CadetExit *pos = cls;
1046 pos->idle = window_size;
1051 * We are short on cadet exits, try to open another one.
1056 struct CadetExit *pos;
1057 uint32_t candidate_count;
1058 uint32_t candidate_selected;
1059 struct GNUNET_HashCode port;
1061 GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER,
1062 strlen (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER),
1064 candidate_count = 0;
1065 for (pos = exit_head; NULL != pos; pos = pos->next)
1066 if (NULL == pos->cadet_channel)
1068 if (0 == candidate_count)
1070 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1071 "No DNS exits available yet.\n");
1074 candidate_selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1076 candidate_count = 0;
1077 for (pos = exit_head; NULL != pos; pos = pos->next)
1078 if (NULL == pos->cadet_channel)
1081 if (candidate_selected < candidate_count)
1083 struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
1084 GNUNET_MQ_hd_var_size (dns_response,
1085 GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET,
1086 struct DnsResponseMessage,
1088 GNUNET_MQ_handler_end ()
1092 /* move to the head of the DLL */
1094 = GNUNET_CADET_channel_create (cadet_handle,
1098 &channel_idle_notify_cb,
1099 &cadet_channel_end_cb,
1101 if (NULL == pos->cadet_channel)
1106 GNUNET_CONTAINER_DLL_remove (exit_head,
1109 GNUNET_CONTAINER_DLL_insert (exit_head,
1112 dns_exit_available++;
1116 GNUNET_assert (NULL == exit_head);
1121 * Function called whenever we find an advertisement for a
1122 * DNS exit in the DHT. If we don't have a cadet channel,
1123 * we should build one; otherwise, we should save the
1124 * advertisement for later use.
1126 * @param cls closure
1127 * @param exp when will this value expire
1128 * @param key key of the result
1129 * @param get_path peers on reply path (or NULL if not recorded)
1130 * [0] = datastore's first neighbor, [length - 1] = local peer
1131 * @param get_path_length number of entries in @a get_path
1132 * @param put_path peers on the PUT path (or NULL if not recorded)
1133 * [0] = origin, [length - 1] = datastore
1134 * @param put_path_length number of entries in @a put_path
1135 * @param type type of the result
1136 * @param size number of bytes in @a data
1137 * @param data pointer to the result data
1140 handle_dht_result (void *cls,
1141 struct GNUNET_TIME_Absolute exp,
1142 const struct GNUNET_HashCode *key,
1143 const struct GNUNET_PeerIdentity *get_path,
1144 unsigned int get_path_length,
1145 const struct GNUNET_PeerIdentity *put_path,
1146 unsigned int put_path_length,
1147 enum GNUNET_BLOCK_Type type,
1148 size_t size, const void *data)
1150 const struct GNUNET_DNS_Advertisement *ad;
1151 struct CadetExit *exit;
1153 if (sizeof(struct GNUNET_DNS_Advertisement) != size)
1159 for (exit = exit_head; NULL != exit; exit = exit->next)
1160 if (0 == GNUNET_memcmp (&ad->peer,
1165 exit = GNUNET_new (struct CadetExit);
1166 exit->peer = ad->peer;
1167 /* channel is closed, so insert at the end */
1168 GNUNET_CONTAINER_DLL_insert_tail (exit_head,
1172 exit->expiration = GNUNET_TIME_absolute_max (exit->expiration,
1173 GNUNET_TIME_absolute_ntoh (
1174 ad->expiration_time));
1175 if (dns_exit_available < MAX_OPEN_TUNNELS)
1181 * @brief Main function that will be run by the scheduler.
1183 * @param cls closure
1184 * @param args remaining command-line arguments
1185 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1186 * @param cfg_ configuration
1189 run (void *cls, char *const *args GNUNET_UNUSED,
1190 const char *cfgfile GNUNET_UNUSED,
1191 const struct GNUNET_CONFIGURATION_Handle *cfg_)
1193 struct GNUNET_HashCode dns_key;
1196 stats = GNUNET_STATISTICS_create ("pt",
1198 ipv4_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1201 ipv6_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1204 dns_channel = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1207 if (! (ipv4_pt || ipv6_pt || dns_channel))
1209 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1210 _ ("No useful service enabled. Exiting.\n"));
1211 GNUNET_SCHEDULER_shutdown ();
1214 GNUNET_SCHEDULER_add_shutdown (&cleanup, cls);
1215 if (ipv4_pt || ipv6_pt)
1218 = GNUNET_DNS_connect (cfg,
1219 GNUNET_DNS_FLAG_POST_RESOLUTION,
1220 &dns_post_request_handler,
1222 if (NULL == dns_post_handle)
1224 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1225 _ ("Failed to connect to %s service. Exiting.\n"),
1227 GNUNET_SCHEDULER_shutdown ();
1230 vpn_handle = GNUNET_VPN_connect (cfg);
1231 if (NULL == vpn_handle)
1233 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1234 _ ("Failed to connect to %s service. Exiting.\n"),
1236 GNUNET_SCHEDULER_shutdown ();
1243 = GNUNET_DNS_connect (cfg,
1244 GNUNET_DNS_FLAG_PRE_RESOLUTION,
1245 &dns_pre_request_handler,
1247 if (NULL == dns_pre_handle)
1249 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1250 _ ("Failed to connect to %s service. Exiting.\n"),
1252 GNUNET_SCHEDULER_shutdown ();
1255 cadet_handle = GNUNET_CADET_connect (cfg);
1256 if (NULL == cadet_handle)
1258 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1259 _ ("Failed to connect to %s service. Exiting.\n"),
1261 GNUNET_SCHEDULER_shutdown ();
1264 dht = GNUNET_DHT_connect (cfg, 1);
1267 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1268 _ ("Failed to connect to %s service. Exiting.\n"),
1270 GNUNET_SCHEDULER_shutdown ();
1273 GNUNET_CRYPTO_hash ("dns",
1276 dht_get = GNUNET_DHT_get_start (dht,
1277 GNUNET_BLOCK_TYPE_DNS,
1280 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1291 * @param argc number of arguments from the command line
1292 * @param argv command line arguments
1293 * @return 0 ok, 1 on error
1299 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1300 GNUNET_GETOPT_OPTION_END
1304 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc,
1310 GNUNET_PROGRAM_run (argc,
1314 "Daemon to run to perform IP protocol translation to GNUnet"),
1320 GNUNET_free ((void *) argv);
1325 /* end of gnunet-daemon-pt.c */