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.
16 * @file pt/gnunet-daemon-pt.c
17 * @brief tool to manipulate DNS and VPN services to perform protocol translation (IPvX over GNUnet)
18 * @author Christian Grothoff
21 #include "gnunet_util_lib.h"
22 #include "gnunet_dns_service.h"
23 #include "gnunet_dnsparser_lib.h"
24 #include "gnunet_cadet_service.h"
25 #include "gnunet_tun_lib.h"
26 #include "gnunet_dht_service.h"
27 #include "gnunet_vpn_service.h"
28 #include "gnunet_statistics_service.h"
29 #include "gnunet_applications.h"
30 #include "block_dns.h"
34 * After how long do we time out if we could not get an IP from VPN or CADET?
36 #define TIMEOUT GNUNET_TIME_UNIT_MINUTES
39 * How many bytes of payload do we allow at most for a DNS reply?
40 * Given that this is pretty much limited to loopback, we can be
41 * pretty high (Linux loopback defaults to 16k, most local UDP packets
42 * should survive up to 9k (NFS), so 8k should be pretty safe in
45 #define MAX_DNS_SIZE (8 * 1024)
48 * How many channels do we open at most at the same time?
50 #define MAX_OPEN_TUNNELS 4
54 * Which group of DNS records are we currently processing?
64 * DNS authority records
66 AUTHORITY_RECORDS = 1,
69 * DNS additional records
71 ADDITIONAL_RECORDS = 2,
74 * We're done processing.
81 * Information tracked per DNS reply that we are processing.
86 * Handle to submit the final result.
88 struct GNUNET_DNS_RequestHandle *rh;
91 * DNS packet that is being modified.
93 struct GNUNET_DNSPARSER_Packet *dns;
96 * Active redirection request with the VPN.
98 struct GNUNET_VPN_RedirectionRequest *rr;
101 * Record for which we have an active redirection request.
103 struct GNUNET_DNSPARSER_Record *rec;
106 * Offset in the current record group that is being modified.
111 * Group that is being modified
113 enum RequestGroup group;
119 * Handle to a peer that advertised that it is willing to serve
120 * as a DNS exit. We try to keep a few channels open and a few
129 struct CadetExit *next;
134 struct CadetExit *prev;
137 * Channel we use for DNS requests over CADET, NULL if we did
138 * not initialze a channel to this peer yet.
140 struct GNUNET_CADET_Channel *cadet_channel;
143 * At what time did the peer's advertisement expire?
145 struct GNUNET_TIME_Absolute expiration;
148 * Head of DLL of requests waiting for a response.
150 struct RequestContext *receive_queue_head;
153 * Tail of DLL of requests waiting for a response.
155 struct RequestContext *receive_queue_tail;
158 * Identity of the peer that is providing the exit for us.
160 struct GNUNET_PeerIdentity peer;
163 * How many DNS requests did we transmit via this channel?
165 unsigned int num_transmitted;
168 * How many DNS requests were answered via this channel?
170 unsigned int num_answered;
173 * Size of the window, 0 if we are busy.
175 /* unsigned */ int idle;
182 * State we keep for a request that is going out via CADET.
184 struct RequestContext
187 * We keep these in a DLL.
189 struct RequestContext *next;
192 * We keep these in a DLL.
194 struct RequestContext *prev;
197 * Exit that was chosen for this request.
199 struct CadetExit *exit;
202 * Handle for interaction with DNS service.
204 struct GNUNET_DNS_RequestHandle *rh;
207 * Envelope with the request we are transmitting.
209 struct GNUNET_MQ_Envelope *env;
212 * Task used to abort this operation with timeout.
214 struct GNUNET_SCHEDULER_Task *timeout_task;
217 * Length of the request message that follows this struct.
222 * 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) &&
334 (drop_percent > 25) )
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));
489 case GNUNET_DNSPARSER_TYPE_AAAA:
490 GNUNET_assert (AF_INET6 == af);
491 GNUNET_memcpy (rc->rec->data.raw.data,
493 sizeof (struct in6_addr));
505 * Modify the given DNS record by asking VPN to create a channel
506 * to the given address. When done, continue with submitting
507 * other records from the request context ('submit_request' is
510 * @param rc context to process
511 * @param rec record to modify
514 modify_address (struct ReplyContext *rc,
515 struct GNUNET_DNSPARSER_Record *rec)
521 case GNUNET_DNSPARSER_TYPE_A:
523 GNUNET_assert (rec->data.raw.data_len == sizeof (struct in_addr));
525 case GNUNET_DNSPARSER_TYPE_AAAA:
527 GNUNET_assert (rec->data.raw.data_len == sizeof (struct in6_addr));
534 rc->rr = GNUNET_VPN_redirect_to_ip (vpn_handle,
538 GNUNET_TIME_relative_to_absolute (TIMEOUT),
539 &vpn_allocation_callback,
545 * Process the next record of the given request context.
546 * When done, submit the reply and free the resources of
549 * @param rc context to process
552 submit_request (struct ReplyContext *rc)
554 struct GNUNET_DNSPARSER_Record *ra;
563 ra = rc->dns->answers;
564 ra_len = rc->dns->num_answers;
566 case AUTHORITY_RECORDS:
567 ra = rc->dns->authority_records;
568 ra_len = rc->dns->num_authority_records;
570 case ADDITIONAL_RECORDS:
571 ra = rc->dns->additional_records;
572 ra_len = rc->dns->num_additional_records;
580 for (i=rc->offset;i<ra_len;i++)
584 case GNUNET_DNSPARSER_TYPE_A:
593 case GNUNET_DNSPARSER_TYPE_AAAA:
610 * Test if any of the given records need protocol-translation work.
612 * @param ra array of records
613 * @param ra_len number of entries in @a ra
614 * @return #GNUNET_YES if any of the given records require protocol-translation
617 work_test (const struct GNUNET_DNSPARSER_Record *ra,
622 for (i=0;i<ra_len;i++)
626 case GNUNET_DNSPARSER_TYPE_A:
630 case GNUNET_DNSPARSER_TYPE_AAAA:
641 * This function is called AFTER we got an IP address for a
642 * DNS request. Now, the PT daemon has the chance to substitute
643 * the IP address with one from the VPN range to channel requests
644 * destined for this IP address via VPN and CADET.
647 * @param rh request handle to user for reply
648 * @param request_length number of bytes in request
649 * @param request udp payload of the DNS request
652 dns_post_request_handler (void *cls,
653 struct GNUNET_DNS_RequestHandle *rh,
654 size_t request_length,
657 struct GNUNET_DNSPARSER_Packet *dns;
658 struct ReplyContext *rc;
661 GNUNET_STATISTICS_update (stats,
662 gettext_noop ("# DNS replies intercepted"),
664 dns = GNUNET_DNSPARSER_parse (request,
668 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
669 _("Failed to parse DNS request. Dropping.\n"));
670 GNUNET_DNS_request_drop (rh);
674 work |= work_test (dns->answers,
676 work |= work_test (dns->authority_records,
677 dns->num_authority_records);
678 work |= work_test (dns->additional_records,
679 dns->num_additional_records);
682 GNUNET_DNS_request_forward (rh);
683 GNUNET_DNSPARSER_free_packet (dns);
686 rc = GNUNET_new (struct ReplyContext);
696 * Task run if the time to answer a DNS request via CADET is over.
698 * @param cls the `struct RequestContext` to abort
701 timeout_request (void *cls)
703 struct RequestContext *rc = cls;
704 struct CadetExit *exit = rc->exit;
706 GNUNET_STATISTICS_update (stats,
707 gettext_noop ("# DNS requests dropped (timeout)"),
710 GNUNET_DNS_request_drop (rc->rh);
712 if ( (0 == get_channel_weight (exit)) &&
713 (NULL == exit->receive_queue_head) )
715 /* this straw broke the camel's back: this channel now has
716 such a low score that it will not be used; close it! */
717 GNUNET_CADET_channel_destroy (exit->cadet_channel);
718 exit->cadet_channel = NULL;
719 GNUNET_CONTAINER_DLL_remove (exit_head,
722 GNUNET_CONTAINER_DLL_insert_tail (exit_head,
725 /* go back to semi-innocent: mark as not great, but
726 avoid a prohibitively negative score (see
727 #get_channel_weight(), which checks for a certain
728 minimum number of transmissions before making
730 exit->num_transmitted = 5;
731 exit->num_answered = 0;
732 dns_exit_available--;
733 /* now try to open an alternative exit */
740 * This function is called *before* the DNS request has been
741 * given to a "local" DNS resolver. Channeling for DNS requests
742 * was enabled, so we now need to send the request via some CADET
743 * channel to a DNS EXIT for resolution.
746 * @param rh request handle to user for reply
747 * @param request_length number of bytes in request
748 * @param request udp payload of the DNS request
751 dns_pre_request_handler (void *cls,
752 struct GNUNET_DNS_RequestHandle *rh,
753 size_t request_length,
756 struct RequestContext *rc;
757 struct GNUNET_MQ_Envelope *env;
758 struct GNUNET_MessageHeader *hdr;
759 struct GNUNET_TUN_DnsHeader dns;
760 struct CadetExit *exit;
762 GNUNET_STATISTICS_update (stats,
763 gettext_noop ("# DNS requests intercepted"),
765 if (0 == dns_exit_available)
767 GNUNET_STATISTICS_update (stats,
768 gettext_noop ("# DNS requests dropped (DNS cadet channel down)"),
770 GNUNET_DNS_request_drop (rh);
773 if (request_length < sizeof (dns))
775 GNUNET_STATISTICS_update (stats,
776 gettext_noop ("# DNS requests dropped (malformed)"),
778 GNUNET_DNS_request_drop (rh);
781 exit = choose_exit ();
782 GNUNET_assert (NULL != exit);
783 GNUNET_assert (NULL != exit->cadet_channel);
785 env = GNUNET_MQ_msg_extra (hdr,
787 GNUNET_MESSAGE_TYPE_VPN_DNS_TO_INTERNET);
788 GNUNET_memcpy (&hdr[1],
791 rc = GNUNET_new (struct RequestContext);
794 rc->timeout_task = GNUNET_SCHEDULER_add_delayed (TIMEOUT,
802 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
803 exit->receive_queue_tail,
807 exit->num_transmitted++;
808 GNUNET_MQ_send (GNUNET_CADET_get_mq (exit->cadet_channel),
809 GNUNET_MQ_env_copy (env));
813 GNUNET_NETWORK_STRUCT_BEGIN
816 * Message with a DNS response.
818 struct DnsResponseMessage
821 * GNUnet header, of type #GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET
823 struct GNUNET_MessageHeader header;
828 struct GNUNET_TUN_DnsHeader dns;
830 /* Followed by more DNS payload */
833 GNUNET_NETWORK_STRUCT_END
836 * Process a request via cadet to perform a DNS query.
838 * @param cls the `struct CadetExit` which got the message
839 * @param msg the actual message
840 * @return #GNUNET_OK to keep the connection open,
841 * #GNUNET_SYSERR to close it (signal serious error)
844 check_dns_response (void *cls,
845 const struct DnsResponseMessage *msg)
847 return GNUNET_OK; /* all OK */
852 * Process a request via cadet to perform a DNS query.
854 * @param cls the `struct CadetExit` which got the message
855 * @param msg the actual message
858 handle_dns_response (void *cls,
859 const struct DnsResponseMessage *msg)
861 struct CadetExit *exit = cls;
863 struct RequestContext *rc;
865 mlen = ntohs (msg->header.size) - sizeof (*msg);
866 for (rc = exit->receive_queue_head; NULL != rc; rc = rc->next)
868 if (msg->dns.id == rc->dns_id)
870 GNUNET_STATISTICS_update (stats,
871 gettext_noop ("# DNS replies received"),
874 GNUNET_DNS_request_answer (rc->rh,
875 mlen + sizeof (struct GNUNET_TUN_DnsHeader),
876 (const void*) &msg->dns);
877 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
878 exit->receive_queue_tail,
880 GNUNET_SCHEDULER_cancel (rc->timeout_task);
881 GNUNET_MQ_discard (rc->env);
883 exit->num_answered++;
887 GNUNET_STATISTICS_update (stats,
888 gettext_noop ("# DNS replies dropped (too late?)"),
894 * Abort all pending DNS requests with the given cadet exit.
896 * @param exit cadet exit to abort requests for
899 abort_all_requests (struct CadetExit *exit)
901 struct RequestContext *rc;
903 while (NULL != (rc = exit->receive_queue_head))
905 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
906 exit->receive_queue_tail,
908 GNUNET_DNS_request_drop (rc->rh);
909 GNUNET_SCHEDULER_cancel (rc->timeout_task);
910 GNUNET_MQ_discard (rc->env);
917 * Function scheduled as very last function, cleans up after us
919 * @param cls closure, NULL
924 struct CadetExit *exit;
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "Protocol translation daemon is shutting down now\n");
928 if (NULL != vpn_handle)
930 GNUNET_VPN_disconnect (vpn_handle);
933 while (NULL != (exit = exit_head))
935 GNUNET_CONTAINER_DLL_remove (exit_head,
938 if (NULL != exit->cadet_channel)
940 GNUNET_CADET_channel_destroy (exit->cadet_channel);
941 exit->cadet_channel = NULL;
943 abort_all_requests (exit);
946 if (NULL != cadet_handle)
948 GNUNET_CADET_disconnect (cadet_handle);
951 if (NULL != dns_post_handle)
953 GNUNET_DNS_disconnect (dns_post_handle);
954 dns_post_handle = NULL;
956 if (NULL != dns_pre_handle)
958 GNUNET_DNS_disconnect (dns_pre_handle);
959 dns_pre_handle = NULL;
963 GNUNET_STATISTICS_destroy (stats, GNUNET_YES);
968 GNUNET_DHT_get_stop (dht_get);
973 GNUNET_DHT_disconnect (dht);
980 * Function called whenever a channel is destroyed. Should clean up
981 * the associated state and attempt to build a new one.
983 * It must NOT call #GNUNET_CADET_channel_destroy on the channel.
985 * @param cls closure (the `struct CadetExit` set from #GNUNET_CADET_connect)
986 * @param channel connection to the other end (henceforth invalid)
987 * @param channel_ctx place where local state associated
988 * with the channel is stored
991 cadet_channel_end_cb (void *cls,
992 const struct GNUNET_CADET_Channel *channel)
994 struct CadetExit *exit = cls;
995 struct CadetExit *alt;
996 struct RequestContext *rc;
998 exit->cadet_channel = NULL;
999 dns_exit_available--;
1000 /* open alternative channels */
1001 /* our channel is now closed, move our requests to an alternative
1003 alt = choose_exit ();
1004 while (NULL != (rc = exit->receive_queue_head))
1006 GNUNET_CONTAINER_DLL_remove (exit->receive_queue_head,
1007 exit->receive_queue_tail,
1010 GNUNET_CONTAINER_DLL_insert (alt->receive_queue_head,
1011 alt->receive_queue_tail,
1013 GNUNET_MQ_send (GNUNET_CADET_get_mq (alt->cadet_channel),
1014 GNUNET_MQ_env_copy (rc->env));
1021 * Function called whenever a channel has excess capacity.
1023 * @param cls the `struct CadetExit`
1024 * @param channel connection to the other end
1025 * @param window_size how much capacity do we have
1028 channel_idle_notify_cb (void *cls,
1029 const struct GNUNET_CADET_Channel *channel,
1032 struct CadetExit *pos = cls;
1034 pos->idle = window_size;
1039 * We are short on cadet exits, try to open another one.
1044 struct CadetExit *pos;
1045 uint32_t candidate_count;
1046 uint32_t candidate_selected;
1047 struct GNUNET_HashCode port;
1049 GNUNET_CRYPTO_hash (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER,
1050 strlen (GNUNET_APPLICATION_PORT_INTERNET_RESOLVER),
1052 candidate_count = 0;
1053 for (pos = exit_head; NULL != pos; pos = pos->next)
1054 if (NULL == pos->cadet_channel)
1056 if (0 == candidate_count)
1058 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1059 "No DNS exits available yet.\n");
1062 candidate_selected = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1064 candidate_count = 0;
1065 for (pos = exit_head; NULL != pos; pos = pos->next)
1066 if (NULL == pos->cadet_channel)
1069 if (candidate_selected < candidate_count)
1071 struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
1072 GNUNET_MQ_hd_var_size (dns_response,
1073 GNUNET_MESSAGE_TYPE_VPN_DNS_FROM_INTERNET,
1074 struct DnsResponseMessage,
1076 GNUNET_MQ_handler_end ()
1080 /* move to the head of the DLL */
1082 = GNUNET_CADET_channel_create (cadet_handle,
1086 GNUNET_CADET_OPTION_DEFAULT,
1087 &channel_idle_notify_cb,
1088 &cadet_channel_end_cb,
1090 if (NULL == pos->cadet_channel)
1095 GNUNET_CONTAINER_DLL_remove (exit_head,
1098 GNUNET_CONTAINER_DLL_insert (exit_head,
1101 dns_exit_available++;
1105 GNUNET_assert (NULL == exit_head);
1110 * Function called whenever we find an advertisement for a
1111 * DNS exit in the DHT. If we don't have a cadet channel,
1112 * we should build one; otherwise, we should save the
1113 * advertisement for later use.
1115 * @param cls closure
1116 * @param exp when will this value expire
1117 * @param key key of the result
1118 * @param get_path peers on reply path (or NULL if not recorded)
1119 * [0] = datastore's first neighbor, [length - 1] = local peer
1120 * @param get_path_length number of entries in @a get_path
1121 * @param put_path peers on the PUT path (or NULL if not recorded)
1122 * [0] = origin, [length - 1] = datastore
1123 * @param put_path_length number of entries in @a put_path
1124 * @param type type of the result
1125 * @param size number of bytes in @a data
1126 * @param data pointer to the result data
1129 handle_dht_result (void *cls,
1130 struct GNUNET_TIME_Absolute exp,
1131 const struct GNUNET_HashCode *key,
1132 const struct GNUNET_PeerIdentity *get_path,
1133 unsigned int get_path_length,
1134 const struct GNUNET_PeerIdentity *put_path,
1135 unsigned int put_path_length,
1136 enum GNUNET_BLOCK_Type type,
1137 size_t size, const void *data)
1139 const struct GNUNET_DNS_Advertisement *ad;
1140 struct CadetExit *exit;
1142 if (sizeof (struct GNUNET_DNS_Advertisement) != size)
1148 for (exit = exit_head; NULL != exit; exit = exit->next)
1149 if (0 == memcmp (&ad->peer,
1151 sizeof (struct GNUNET_PeerIdentity)))
1155 exit = GNUNET_new (struct CadetExit);
1156 exit->peer = ad->peer;
1157 /* channel is closed, so insert at the end */
1158 GNUNET_CONTAINER_DLL_insert_tail (exit_head,
1162 exit->expiration = GNUNET_TIME_absolute_max (exit->expiration,
1163 GNUNET_TIME_absolute_ntoh (ad->expiration_time));
1164 if (dns_exit_available < MAX_OPEN_TUNNELS)
1170 * @brief Main function that will be run by the scheduler.
1172 * @param cls closure
1173 * @param args remaining command-line arguments
1174 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
1175 * @param cfg_ configuration
1178 run (void *cls, char *const *args GNUNET_UNUSED,
1179 const char *cfgfile GNUNET_UNUSED,
1180 const struct GNUNET_CONFIGURATION_Handle *cfg_)
1182 struct GNUNET_HashCode dns_key;
1185 stats = GNUNET_STATISTICS_create ("pt",
1187 ipv4_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1190 ipv6_pt = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1193 dns_channel = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1196 if (! (ipv4_pt || ipv6_pt || dns_channel))
1198 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1199 _("No useful service enabled. Exiting.\n"));
1200 GNUNET_SCHEDULER_shutdown ();
1203 GNUNET_SCHEDULER_add_shutdown (&cleanup, cls);
1204 if (ipv4_pt || ipv6_pt)
1207 = GNUNET_DNS_connect (cfg,
1208 GNUNET_DNS_FLAG_POST_RESOLUTION,
1209 &dns_post_request_handler,
1211 if (NULL == dns_post_handle)
1213 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1214 _("Failed to connect to %s service. Exiting.\n"),
1216 GNUNET_SCHEDULER_shutdown ();
1219 vpn_handle = GNUNET_VPN_connect (cfg);
1220 if (NULL == vpn_handle)
1222 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1223 _("Failed to connect to %s service. Exiting.\n"),
1225 GNUNET_SCHEDULER_shutdown ();
1232 = GNUNET_DNS_connect (cfg,
1233 GNUNET_DNS_FLAG_PRE_RESOLUTION,
1234 &dns_pre_request_handler,
1236 if (NULL == dns_pre_handle)
1238 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1239 _("Failed to connect to %s service. Exiting.\n"),
1241 GNUNET_SCHEDULER_shutdown ();
1244 cadet_handle = GNUNET_CADET_connect (cfg);
1245 if (NULL == cadet_handle)
1247 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1248 _("Failed to connect to %s service. Exiting.\n"),
1250 GNUNET_SCHEDULER_shutdown ();
1253 dht = GNUNET_DHT_connect (cfg, 1);
1256 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1257 _("Failed to connect to %s service. Exiting.\n"),
1259 GNUNET_SCHEDULER_shutdown ();
1262 GNUNET_CRYPTO_hash ("dns",
1265 dht_get = GNUNET_DHT_get_start (dht,
1266 GNUNET_BLOCK_TYPE_DNS,
1269 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1280 * @param argc number of arguments from the command line
1281 * @param argv command line arguments
1282 * @return 0 ok, 1 on error
1288 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
1289 GNUNET_GETOPT_OPTION_END
1293 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc,
1299 GNUNET_PROGRAM_run (argc,
1302 gettext_noop ("Daemon to run to perform IP protocol translation to GNUnet"),
1308 GNUNET_free ((void*) argv);
1313 /* end of gnunet-daemon-pt.c */