GNUnet  0.19.2
gnunet-dns2gns.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2012-2013 GNUnet e.V.
4 
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.
9 
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.
14 
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/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
25 #include "platform.h"
26 #include <gnunet_util_lib.h>
27 #include <gnunet_gns_service.h>
28 #include "gnunet_vpn_service.h"
29 #include "gns.h"
30 
34 #define TIMEOUT GNUNET_TIME_UNIT_MINUTES
35 
39 #define VPN_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 30)
40 
41 
42 struct Request;
43 
47 struct VpnContext
48 {
52  struct Request *request;
53 
58 
62  unsigned int rd_count;
63 
67  char *rd_data;
68 
72  ssize_t rd_data_size;
73 };
74 
75 
79 struct Request
80 {
85 
89  const void *addr;
90 
96 
101 
106 
112 
117 
121  char *udp_msg;
122 
126  size_t addr_len;
127 
131  size_t udp_msg_size;
132 
137 
138 };
139 
143 static in_addr_t address;
144 
148 static struct in6_addr address6;
149 
150 
155 
160 
165 
170 
175 
179 static struct GNUNET_SCHEDULER_Task *t4;
180 
184 static struct GNUNET_SCHEDULER_Task *t6;
185 
189 static char *dns_ip;
190 
194 static unsigned long long listen_port = 53;
195 
199 static const struct GNUNET_CONFIGURATION_Handle *cfg;
200 
201 
207 static void
208 do_shutdown (void *cls)
209 {
210  (void) cls;
211  if (NULL != t4)
212  {
214  t4 = NULL;
215  }
216  if (NULL != t6)
217  {
219  t6 = NULL;
220  }
221  if (NULL != listen_socket4)
222  {
224  listen_socket4 = NULL;
225  }
226  if (NULL != listen_socket6)
227  {
229  listen_socket6 = NULL;
230  }
231  if (NULL != gns)
232  {
234  gns = NULL;
235  }
236  if (NULL != vpn_handle)
237  {
239  vpn_handle = NULL;
240  }
241  if (NULL != dns_stub)
242  {
244  dns_stub = NULL;
245  }
246 }
247 
248 
255 static void
257 {
258  unsigned int idx = request->packet->num_answers;
259  unsigned int r_idx;
260  struct GNUNET_DNSPARSER_Record tmp_answer;
261 
262  while (0 != idx)
263  {
265  request->packet->num_answers);
266  idx--;
267  tmp_answer = request->packet->answers[idx];
268  memcpy (&request->packet->answers[idx], &request->packet->answers[r_idx],
269  sizeof (struct GNUNET_DNSPARSER_Record));
270  memcpy (&request->packet->answers[r_idx], &tmp_answer,
271  sizeof (struct GNUNET_DNSPARSER_Record));
272  }
273 }
274 
275 
281 static void
283 {
284  char *buf;
285  size_t size;
286  ssize_t sret;
287 
289  if (GNUNET_SYSERR ==
291  UINT16_MAX /* is this not too much? */,
292  &buf,
293  &size))
294  {
296  _ ("Failed to pack DNS response into UDP packet!\n"));
297  }
298  else
299  {
300  sret = GNUNET_NETWORK_socket_sendto (request->lsock,
301  buf,
302  size,
303  request->addr,
304  request->addr_len);
305  if ((sret < 0) ||
306  (size != (size_t) sret))
308  "sendto");
309  GNUNET_free (buf);
310  }
311  GNUNET_SCHEDULER_cancel (request->timeout_task);
313  GNUNET_free (request->udp_msg);
315 }
316 
317 
323 static void
324 do_timeout (void *cls)
325 {
326  struct Request *request = cls;
327  struct VpnContext *vpn_ctx;
328 
329  if (NULL != request->packet)
331  if (NULL != request->lookup)
333  if (NULL != request->dns_lookup)
335  GNUNET_free (request->udp_msg);
336  if (NULL != (vpn_ctx = request->vpn_ctx))
337  {
339  GNUNET_free (vpn_ctx->rd_data);
340  GNUNET_free (vpn_ctx);
341  }
343 }
344 
345 
353 static void
355  const struct GNUNET_TUN_DnsHeader *dns,
356  size_t r)
357 {
358  struct Request *request = cls;
359 
360  if (NULL == dns)
361  {
362  /* DNSSTUB gave up, so we trigger timeout early */
363  GNUNET_SCHEDULER_cancel (request->timeout_task);
365  return;
366  }
367  if (request->original_request_id != dns->id)
368  {
369  /* for a another query, ignore */
370  return;
371  }
372  request->packet = GNUNET_DNSPARSER_parse ((char *) dns,
373  r);
374  if (NULL == request->packet)
375  {
377  _ ("Failed to parse DNS response!\n"));
378  GNUNET_SCHEDULER_cancel (request->timeout_task);
380  return;
381  }
384 }
385 
400 static void
401 vpn_allocation_cb (void *cls,
402  int af,
403  const void *address)
404 {
405  struct VpnContext *vpn_ctx = cls;
406  struct Request *request = vpn_ctx->request;
407  struct GNUNET_GNSRECORD_Data rd[vpn_ctx->rd_count];
408  unsigned int i;
409 
410  vpn_ctx->vpn_request = NULL;
411  request->vpn_ctx = NULL;
414  (size_t) vpn_ctx->rd_data_size,
415  vpn_ctx->rd_data,
416  vpn_ctx->rd_count,
417  rd));
418  for (i = 0; i < vpn_ctx->rd_count; i++)
419  {
421  {
422  switch (af)
423  {
424  case AF_INET:
426  rd[i].data_size = sizeof(struct in_addr);
429  rd[i].flags = 0;
430  rd[i].data = address;
431  break;
432 
433  case AF_INET6:
437  rd[i].flags = 0;
438  rd[i].data = address;
439  rd[i].data_size = sizeof(struct in6_addr);
440  break;
441 
442  default:
443  GNUNET_assert (0);
444  }
445  break;
446  }
447  }
448  GNUNET_assert (i < vpn_ctx->rd_count);
449  if (0 == vpn_ctx->rd_count)
451  _ ("VPN returned empty result for `%s'\n"),
452  request->packet->queries[0].name);
454  GNUNET_free (vpn_ctx->rd_data);
455  GNUNET_free (vpn_ctx);
456 }
457 
458 
459 
468 static void
469 result_processor (void *cls,
470  int was_gns,
471  uint32_t rd_count,
472  const struct GNUNET_GNSRECORD_Data *rd)
473 {
474  struct Request *request = cls;
475  struct GNUNET_DNSPARSER_Packet *packet;
476  struct GNUNET_DNSPARSER_Record rec;
477  struct VpnContext *vpn_ctx;
478  const struct GNUNET_TUN_GnsVpnRecord *vpn;
479  const char *vname;
480  struct GNUNET_HashCode vhash;
481  int af;
482 
483  request->lookup = NULL;
484  if (GNUNET_NO == was_gns)
485  {
486  /* TLD not configured for GNS, fall back to DNS */
488  "Using DNS resolver IP `%s' to resolve `%s'\n",
489  dns_ip,
490  request->packet->queries[0].name);
491  request->original_request_id = request->packet->id;
493  request->packet = NULL;
494  request->dns_lookup = GNUNET_DNSSTUB_resolve (dns_stub,
495  request->udp_msg,
496  request->udp_msg_size,
498  request);
499  return;
500  }
501  packet = request->packet;
502  packet->flags.query_or_response = 1;
504  packet->flags.checking_disabled = 0;
505  packet->flags.authenticated_data = 1;
506  packet->flags.zero = 0;
507  packet->flags.recursion_available = 1;
508  packet->flags.message_truncated = 0;
509  packet->flags.authoritative_answer = 0;
510  // packet->flags.opcode = GNUNET_TUN_DNS_OPCODE_STATUS; // ???
511  for (uint32_t i = 0; i < rd_count; i++)
512  {
514  switch (rd[i].record_type)
515  {
517  GNUNET_assert (sizeof(struct in_addr) == rd[i].data_size);
518  rec.name = GNUNET_strdup (packet->queries[0].name);
521  rec.data.raw.data = GNUNET_new (struct in_addr);
522  GNUNET_memcpy (rec.data.raw.data,
523  rd[i].data,
524  rd[i].data_size);
525  rec.data.raw.data_len = sizeof(struct in_addr);
526  GNUNET_array_append (packet->answers,
527  packet->num_answers,
528  rec);
529  break;
530 
532  GNUNET_assert (sizeof(struct in6_addr) == rd[i].data_size);
533  rec.name = GNUNET_strdup (packet->queries[0].name);
534  rec.data.raw.data = GNUNET_new (struct in6_addr);
537  GNUNET_memcpy (rec.data.raw.data,
538  rd[i].data,
539  rd[i].data_size);
540  rec.data.raw.data_len = sizeof(struct in6_addr);
541  GNUNET_array_append (packet->answers,
542  packet->num_answers,
543  rec);
544  break;
545 
547  rec.name = GNUNET_strdup (packet->queries[0].name);
548  rec.data.hostname = GNUNET_strdup (rd[i].data);
552  rd[i].data,
553  rd[i].data_size);
554  GNUNET_array_append (packet->answers,
555  packet->num_answers,
556  rec);
557  break;
559  if ((GNUNET_DNSPARSER_TYPE_A != request->packet->queries[0].type) &&
560  (GNUNET_DNSPARSER_TYPE_AAAA != request->packet->queries[0].type))
561  break;
562  af = (GNUNET_DNSPARSER_TYPE_A == request->packet->queries[0].type) ?
563  AF_INET :
564  AF_INET6;
565  if (sizeof(struct GNUNET_TUN_GnsVpnRecord) >
566  rd[i].data_size)
567  {
568  GNUNET_break_op (0);
569  break;
570  }
571  vpn = (const struct GNUNET_TUN_GnsVpnRecord *) rd[i].data;
572  vname = (const char *) &vpn[1];
573  if ('\0' != vname[rd[i].data_size - 1 - sizeof(struct
575  ])
576  {
577  GNUNET_break_op (0);
578  break;
579  }
581  &vhash);
583  "Attempting VPN allocation for %s-%s (AF: %d, proto %d)\n",
584  GNUNET_i2s (&vpn->peer),
585  vname,
586  (int) af,
587  (int) ntohs (vpn->proto));
588  vpn_ctx = GNUNET_new (struct VpnContext);
589  request->vpn_ctx = vpn_ctx;
590  vpn_ctx->request = request;
592  rd);
593  if (vpn_ctx->rd_data_size < 0)
594  {
595  GNUNET_break_op (0);
596  GNUNET_free (vpn_ctx);
597  break;
598  }
599  vpn_ctx->rd_data = GNUNET_malloc ((size_t) vpn_ctx->rd_data_size);
600  vpn_ctx->rd_count = rd_count;
601  GNUNET_assert (vpn_ctx->rd_data_size ==
603  rd,
604  (size_t) vpn_ctx
605  ->rd_data_size,
606  vpn_ctx->rd_data));
608  af,
609  ntohs (
610  vpn->proto),
611  &vpn->peer,
612  &vhash,
614  VPN_TIMEOUT),
615  &
617  vpn_ctx);
618  return;
619 
620 
621  default:
622  /* skip */
623  break;
624  }
625  }
627 }
628 
629 
639 static void
641  const void *addr,
642  size_t addr_len,
643  const char *udp_msg,
644  size_t udp_msg_size)
645 {
646  struct Request *request;
647  struct GNUNET_DNSPARSER_Packet *packet;
648 
649  packet = GNUNET_DNSPARSER_parse (udp_msg,
650  udp_msg_size);
651  if (NULL == packet)
652  {
654  _ ("Cannot parse DNS request from %s\n"),
655  GNUNET_a2s (addr, addr_len));
656  return;
657  }
659  "Received request for `%s' with flags %u, #answers %d, #auth %d, #additional %d\n",
660  packet->queries[0].name,
661  (unsigned int) packet->flags.query_or_response,
662  (int) packet->num_answers,
663  (int) packet->num_authority_records,
664  (int) packet->num_additional_records);
665  if ((0 != packet->flags.query_or_response) ||
666  (0 != packet->num_answers) ||
667  (0 != packet->num_authority_records))
668  {
670  _ ("Received malformed DNS request from %s\n"),
671  GNUNET_a2s (addr, addr_len));
673  return;
674  }
675  if ((1 != packet->num_queries))
676  {
678  _ ("Received unsupported DNS request from %s\n"),
679  GNUNET_a2s (addr,
680  addr_len));
682  return;
683  }
684  request = GNUNET_malloc (sizeof(struct Request) + addr_len);
685  request->lsock = lsock;
686  request->packet = packet;
687  request->addr = &request[1];
688  request->addr_len = addr_len;
689  GNUNET_memcpy (&request[1],
690  addr,
691  addr_len);
692  request->udp_msg_size = udp_msg_size;
693  request->udp_msg = GNUNET_memdup (udp_msg,
694  udp_msg_size);
696  &do_timeout,
697  request);
699  "Calling GNS on `%s'\n",
700  packet->queries[0].name);
702  packet->queries[0].name,
703  packet->queries[0].type,
706  request);
707 }
708 
709 
715 static void
716 read_dns4 (void *cls)
717 {
718  struct sockaddr_in v4;
719  socklen_t addrlen;
720  ssize_t size;
721  const struct GNUNET_SCHEDULER_TaskContext *tc;
722 
723  GNUNET_assert (listen_socket4 == cls);
726  &read_dns4,
730  return; /* shutdown? */
732  if (0 > size)
733  {
734  GNUNET_break (0);
735  return; /* read error!? */
736  }
737  {
738  char buf[size + 1];
739  ssize_t sret;
740 
741  addrlen = sizeof(v4);
743  buf,
744  size + 1,
745  (struct sockaddr *) &v4,
746  &addrlen);
747  if (0 > sret)
748  {
750  "recvfrom");
751  return;
752  }
753  GNUNET_break (size == sret);
755  &v4,
756  addrlen,
757  buf,
758  size);
759  }
760 }
761 
762 
768 static void
769 read_dns6 (void *cls)
770 {
771  struct sockaddr_in6 v6;
772  socklen_t addrlen;
773  ssize_t size;
774  const struct GNUNET_SCHEDULER_TaskContext *tc;
775 
776  GNUNET_assert (listen_socket6 == cls);
779  &read_dns6,
783  return; /* shutdown? */
785  if (0 > size)
786  {
787  GNUNET_break (0);
788  return; /* read error!? */
789  }
790  {
791  char buf[size];
792  ssize_t sret;
793 
794  addrlen = sizeof(v6);
796  buf,
797  size,
798  (struct sockaddr *) &v6,
799  &addrlen);
800  if (0 > sret)
801  {
803  "recvfrom");
804  return;
805  }
806  GNUNET_break (size == sret);
808  &v6,
809  addrlen,
810  buf,
811  size);
812  }
813 }
814 
815 
824 static void
825 run (void *cls,
826  char *const *args,
827  const char *cfgfile,
828  const struct GNUNET_CONFIGURATION_Handle *c)
829 {
830  char *addr_str;
831 
832  (void) cls;
833  (void) args;
834  (void) cfgfile;
835  cfg = c;
836  if (NULL == dns_ip)
837  {
839  _ ("No DNS server specified!\n"));
840  return;
841  }
843  NULL);
844  if (NULL == (gns = GNUNET_GNS_connect (cfg)))
845  return;
846  if (NULL == (vpn_handle = GNUNET_VPN_connect (cfg)))
847  return;
848  GNUNET_assert (NULL != (dns_stub = GNUNET_DNSSTUB_start (128)));
849  if (GNUNET_OK !=
851  dns_ip))
852  {
855  gns = NULL;
857  vpn_handle = NULL;
858  return;
859  }
860 
861  /* Get address to bind to */
863  "BIND_TO",
864  &addr_str))
865  {
866  // No address specified
868  "Don't know what to bind to...\n");
869  GNUNET_free (addr_str);
871  return;
872  }
873  if (1 != inet_pton (AF_INET, addr_str, &address))
874  {
876  "Unable to parse address %s\n",
877  addr_str);
878  GNUNET_free (addr_str);
880  return;
881  }
882  GNUNET_free (addr_str);
883  /* Get address to bind to */
885  "BIND_TO6",
886  &addr_str))
887  {
888  // No address specified
890  "Don't know what to bind6 to...\n");
891  GNUNET_free (addr_str);
893  return;
894  }
895  if (1 != inet_pton (AF_INET6, addr_str, &address6))
896  {
898  "Unable to parse IPv6 address %s\n",
899  addr_str);
900  GNUNET_free (addr_str);
902  return;
903  }
904  GNUNET_free (addr_str);
906  "PORT",
907  &listen_port))
909  "Listening on %llu\n", listen_port);
910 
912  SOCK_DGRAM,
913  IPPROTO_UDP);
914  if (NULL != listen_socket4)
915  {
916  struct sockaddr_in v4;
917 
918  memset (&v4, 0, sizeof(v4));
919  v4.sin_family = AF_INET;
920  v4.sin_addr.s_addr = address;
921 #if HAVE_SOCKADDR_IN_SIN_LEN
922  v4.sin_len = sizeof(v4);
923 #endif
924  v4.sin_port = htons (listen_port);
925  if (GNUNET_OK !=
927  (struct sockaddr *) &v4,
928  sizeof(v4)))
929  {
932  listen_socket4 = NULL;
933  }
934  }
936  SOCK_DGRAM,
937  IPPROTO_UDP);
938  if (NULL != listen_socket6)
939  {
940  struct sockaddr_in6 v6;
941 
942  memset (&v6, 0, sizeof(v6));
943  v6.sin6_family = AF_INET6;
944  v6.sin6_addr = address6;
945 #if HAVE_SOCKADDR_IN_SIN_LEN
946  v6.sin6_len = sizeof(v6);
947 #endif
948  v6.sin6_port = htons (listen_port);
949  if (GNUNET_OK !=
951  (struct sockaddr *) &v6,
952  sizeof(v6)))
953  {
956  listen_socket6 = NULL;
957  }
958  }
959  if ((NULL == listen_socket4) &&
960  (NULL == listen_socket6))
961  {
963  gns = NULL;
965  vpn_handle = NULL;
967  dns_stub = NULL;
968  return;
969  }
970  if (NULL != listen_socket4)
973  &read_dns4,
975  if (NULL != listen_socket6)
978  &read_dns6,
980 }
981 
982 
990 int
991 main (int argc,
992  char *const *argv)
993 {
996  "dns",
997  "IP",
998  gettext_noop (
999  "IP of recursive DNS resolver to use (required)"),
1000  &dns_ip),
1002  };
1003  int ret;
1004 
1005  if (GNUNET_OK !=
1006  GNUNET_STRINGS_get_utf8_args (argc, argv,
1007  &argc, &argv))
1008  return 2;
1009  GNUNET_log_setup ("gnunet-dns2gns",
1010  "WARNING",
1011  NULL);
1012  ret =
1013  (GNUNET_OK ==
1014  GNUNET_PROGRAM_run (argc, argv,
1015  "gnunet-dns2gns",
1016  _ ("GNUnet DNS-to-GNS proxy (a DNS server)"),
1017  options,
1018  &run, NULL)) ? 0 : 1;
1019  GNUNET_free_nz ((void *) argv);
1020  return ret;
1021 }
1022 
1023 
1024 /* end of gnunet-dns2gns.c */
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
#define GNUNET_GNSRECORD_TYPE_VPN
VPN resolution.
#define gettext_noop(String)
Definition: gettext.h:70
IPC messages between GNS API and GNS service.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
struct GNUNET_GNS_Handle * gns
Handle to GNS resolver.
static void dns_result_processor(void *cls, const struct GNUNET_TUN_DnsHeader *dns, size_t r)
Iterator called on obtained result for a DNS lookup.
static void read_dns6(void *cls)
Task to read IPv6 DNS packets.
static struct GNUNET_VPN_Handle * vpn_handle
Our handle to the vpn service.
static struct GNUNET_NETWORK_Handle * listen_socket6
Listen socket for IPv6.
static unsigned long long listen_port
UDP Port we listen on for inbound DNS requests.
static void do_timeout(void *cls)
Task run on timeout.
#define TIMEOUT
Timeout for DNS requests.
static char * dns_ip
IP of DNS server.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration to use.
static struct GNUNET_SCHEDULER_Task * t4
Task for IPv4 socket.
static void shuffle_answers(struct Request *request)
Shuffle answers Fisher-Yates (aka Knuth) Shuffle.
static void handle_request(struct GNUNET_NETWORK_Handle *lsock, const void *addr, size_t addr_len, const char *udp_msg, size_t udp_msg_size)
Handle DNS request.
static struct in6_addr address6
The IPv6 address to bind to.
static void do_shutdown(void *cls)
Task run on shutdown.
static void vpn_allocation_cb(void *cls, int af, const void *address)
Callback invoked from the VPN service once a redirection is available.
struct GNUNET_DNSSTUB_Context * dns_stub
Stub resolver.
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Main function that will be run.
#define VPN_TIMEOUT
Default timeout for VPN redirections.
static void read_dns4(void *cls)
Task to read IPv4 DNS packets.
static struct GNUNET_NETWORK_Handle * listen_socket4
Listen socket for IPv4.
static void result_processor(void *cls, int was_gns, uint32_t rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Iterator called on obtained result for a GNS lookup.
int main(int argc, char *const *argv)
The main function for the dns2gns daemon.
static in_addr_t address
The address to bind to.
static void send_response(struct Request *request)
Send the response for the given request and clean up.
static struct GNUNET_SCHEDULER_Task * t6
Task for IPv6 socket.
uint32_t data
The data value.
static unsigned int rd_count
Number of records for currently parsed set.
static struct GNUNET_GNSRECORD_Data rd[50]
The record data under a single label.
static char buf[2048]
static struct GNUNET_VPN_RedirectionRequest * request
Opaque redirection request handle.
Definition: gnunet-vpn.c:40
API to the GNS service.
API to access the VPN service.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_number(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, unsigned long long *number)
Get a configuration value that should be a number.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_string(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be a string.
uint32_t GNUNET_CRYPTO_random_u32(enum GNUNET_CRYPTO_Quality mode, uint32_t i)
Produce a random value.
@ GNUNET_CRYPTO_QUALITY_WEAK
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
void GNUNET_DNSPARSER_free_packet(struct GNUNET_DNSPARSER_Packet *p)
Free memory taken by a packet.
Definition: dnsparser.c:854
#define GNUNET_DNSPARSER_TYPE_A
struct GNUNET_DNSPARSER_Packet * GNUNET_DNSPARSER_parse(const char *udp_payload, size_t udp_payload_length)
Parse a UDP payload of a DNS packet in to a nice struct for further processing and manipulation.
Definition: dnsparser.c:656
#define GNUNET_DNSPARSER_TYPE_CNAME
#define GNUNET_DNSPARSER_TYPE_AAAA
int GNUNET_DNSPARSER_pack(const struct GNUNET_DNSPARSER_Packet *p, uint16_t max, char **buf, size_t *buf_length)
Given a DNS packet p, generate the corresponding UDP payload.
Definition: dnsparser.c:1259
int GNUNET_DNSSTUB_add_dns_ip(struct GNUNET_DNSSTUB_Context *ctx, const char *dns_ip)
Add nameserver for use by the DNSSTUB.
Definition: dnsstub.c:613
void GNUNET_DNSSTUB_stop(struct GNUNET_DNSSTUB_Context *ctx)
Cleanup DNSSTUB resolver.
Definition: dnsstub.c:705
struct GNUNET_DNSSTUB_Context * GNUNET_DNSSTUB_start(unsigned int num_sockets)
Start a DNS stub resolver.
Definition: dnsstub.c:586
void GNUNET_DNSSTUB_resolve_cancel(struct GNUNET_DNSSTUB_RequestSocket *rs)
Cancel DNS resolution.
Definition: dnsstub.c:562
struct GNUNET_DNSSTUB_RequestSocket * GNUNET_DNSSTUB_resolve(struct GNUNET_DNSSTUB_Context *ctx, const void *request, size_t request_len, GNUNET_DNSSTUB_ResultCallback rc, void *rc_cls)
Perform DNS resolution using our default IP from init.
Definition: dnsstub.c:526
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_string(char shortName, const char *name, const char *argumentHelp, const char *description, char **str)
Allow user to specify a string.
void GNUNET_GNS_disconnect(struct GNUNET_GNS_Handle *handle)
Shutdown connection with the GNS service.
Definition: gns_api.c:290
void * GNUNET_GNS_lookup_with_tld_cancel(struct GNUNET_GNS_LookupWithTldRequest *ltr)
Cancel pending lookup request.
Definition: gns_tld_api.c:332
struct GNUNET_GNS_LookupWithTldRequest * GNUNET_GNS_lookup_with_tld(struct GNUNET_GNS_Handle *handle, const char *name, uint32_t type, enum GNUNET_GNS_LocalOptions options, GNUNET_GNS_LookupResultProcessor2 proc, void *proc_cls)
Perform an asynchronous lookup operation on the GNS, determining the zone using the TLD of the given ...
Definition: gns_tld_api.c:241
struct GNUNET_GNS_Handle * GNUNET_GNS_connect(const struct GNUNET_CONFIGURATION_Handle *cfg)
Initialize the connection with the GNS service.
Definition: gns_api.c:268
@ GNUNET_GNS_LO_DEFAULT
Defaults, look in cache, then in DHT.
int GNUNET_GNSRECORD_records_deserialize(size_t len, const char *src, unsigned int rd_count, struct GNUNET_GNSRECORD_Data *dest)
Deserialize the given records to the given destination.
ssize_t GNUNET_GNSRECORD_records_serialize(unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd, size_t dest_size, char *dest)
Serialize the given records to the given destination buffer.
GNUNET_NETWORK_STRUCT_END ssize_t GNUNET_GNSRECORD_records_get_size(unsigned int rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Calculate how many bytes we will need to serialize the given records.
#define GNUNET_log(kind,...)
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
@ GNUNET_OK
@ GNUNET_NO
@ GNUNET_SYSERR
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
int GNUNET_log_setup(const char *comp, const char *loglevel, const char *logfile)
Setup logging.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_WARNING
@ GNUNET_ERROR_TYPE_ERROR
@ GNUNET_ERROR_TYPE_DEBUG
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_array_append(arr, len, element)
Append an element to an array (growing the array by one).
#define GNUNET_free(ptr)
Wrapper around free.
#define GNUNET_free_nz(ptr)
Wrapper around free.
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
enum GNUNET_GenericReturnValue GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:508
ssize_t GNUNET_NETWORK_socket_recvfrom(const struct GNUNET_NETWORK_Handle *desc, void *buffer, size_t length, struct sockaddr *src_addr, socklen_t *addrlen)
Read data from a socket (always non-blocking).
Definition: network.c:687
ssize_t GNUNET_NETWORK_socket_recvfrom_amount(const struct GNUNET_NETWORK_Handle *desc)
How much data is available to be read on this descriptor?
Definition: network.c:670
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:832
enum GNUNET_GenericReturnValue GNUNET_NETWORK_socket_bind(struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Bind a socket to a particular address.
Definition: network.c:439
ssize_t GNUNET_NETWORK_socket_sendto(const struct GNUNET_NETWORK_Handle *desc, const void *message, size_t length, const struct sockaddr *dest_addr, socklen_t dest_len)
Send data to a particular destination (always non-blocking).
Definition: network.c:771
enum GNUNET_GenericReturnValue GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration,...
Definition: program.c:400
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:534
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1475
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_shutdown(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run on shutdown, that is when a CTRL-C signal is received,...
Definition: scheduler.c:1303
const struct GNUNET_SCHEDULER_TaskContext * GNUNET_SCHEDULER_get_task_context(void)
Obtain the reasoning why the current task was started.
Definition: scheduler.c:724
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:944
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1241
@ GNUNET_SCHEDULER_REASON_READ_READY
The reading socket is ready.
enum GNUNET_GenericReturnValue GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1222
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:316
#define GNUNET_TUN_DNS_CLASS_INTERNET
A few common DNS classes (ok, only one is common, but I list a couple more to make it clear what we'r...
void GNUNET_TUN_service_name_to_hash(const char *service_name, struct GNUNET_HashCode *hc)
Hash the service name of a hosted service to the hash code that is used to identify the service on th...
Definition: regex.c:772
#define GNUNET_TUN_DNS_RETURN_CODE_NO_ERROR
RFC 1035 codes.
void GNUNET_VPN_cancel_request(struct GNUNET_VPN_RedirectionRequest *rr)
Cancel redirection request with the service.
Definition: vpn_api.c:375
struct GNUNET_VPN_Handle * GNUNET_VPN_connect(const struct GNUNET_CONFIGURATION_Handle *cfg)
Connect to the VPN service.
Definition: vpn_api.c:490
struct GNUNET_VPN_RedirectionRequest * GNUNET_VPN_redirect_to_peer(struct GNUNET_VPN_Handle *vh, int result_af, uint8_t protocol, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_HashCode *serv, struct GNUNET_TIME_Absolute expiration_time, GNUNET_VPN_AllocationCallback cb, void *cb_cls)
Tell the VPN that a forwarding to a particular peer offering a particular service is requested.
Definition: vpn_api.c:388
void GNUNET_VPN_disconnect(struct GNUNET_VPN_Handle *vh)
Disconnect from the VPN service.
Definition: vpn_api.c:512
static unsigned int size
Size of the "table".
Definition: peer.c:68
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:424
Easy-to-process, parsed version of a DNS packet.
struct GNUNET_DNSPARSER_Query * queries
Array of all queries in the packet, must contain "num_queries" entries.
unsigned int num_answers
Number of answers in the packet, should be 0 for queries.
struct GNUNET_TUN_DnsFlags flags
Bitfield of DNS flags.
struct GNUNET_DNSPARSER_Record * answers
Array of all answers in the packet, must contain "num_answers" entries.
unsigned int num_additional_records
Number of additional records in the packet, should be 0 for queries.
unsigned int num_authority_records
Number of authoritative answers in the packet, should be 0 for queries.
unsigned int num_queries
Number of queries in the packet.
uint16_t type
See GNUNET_DNSPARSER_TYPE_*.
char * name
Name of the record that the query is for (0-terminated).
void * data
Binary record data.
size_t data_len
Number of bytes in data.
A DNS response record.
uint16_t dns_traffic_class
See GNUNET_TUN_DNS_CLASS_*.
char * hostname
For NS, CNAME and PTR records, this is the uncompressed 0-terminated hostname.
uint16_t type
See GNUNET_DNSPARSER_TYPE_*.
struct GNUNET_TIME_Absolute expiration_time
When does the record expire?
union GNUNET_DNSPARSER_Record::@24 data
Payload of the record (which one of these is valid depends on the 'type').
char * name
Name of the record that the query is for (0-terminated).
struct GNUNET_DNSPARSER_RawRecord raw
Raw data for all other types.
Handle to the stub resolver.
Definition: dnsstub.c:125
UDP socket we are using for sending DNS requests to the Internet.
Definition: dnsstub.c:46
Definition of a command line option.
uint32_t record_type
Type of the GNS/DNS record.
const void * data
Binary value stored in the DNS record.
size_t data_size
Number of bytes in data.
enum GNUNET_GNSRECORD_Flags flags
Flags for the record.
uint64_t expiration_time
Expiration time for the DNS record.
Connection to the GNS service.
Definition: gns_api.h:36
Handle to a lookup request.
Definition: gns_tld_api.c:45
A 512-bit hashcode.
handle to a socket
Definition: network.c:53
Context information passed to each scheduler task.
enum GNUNET_SCHEDULER_Reason reason
Reason why the task is run now.
Entry in list of pending tasks.
Definition: scheduler.c:136
uint64_t abs_value_us
The actual value.
unsigned int checking_disabled
See RFC 4035.
unsigned int zero
Always zero.
unsigned int message_truncated
Set to 1 if message is truncated.
unsigned int query_or_response
query:0, response:1
unsigned int return_code
See GNUNET_TUN_DNS_RETURN_CODE_ defines.
unsigned int recursion_available
Set to 1 if recursion is available (server -> client)
unsigned int authenticated_data
Response has been cryptographically verified, RFC 4035.
unsigned int authoritative_answer
Set to 1 if this is an authoritative answer.
uint16_t id
Unique identifier for the request/response.
Payload of GNS VPN record.
struct GNUNET_PeerIdentity peer
The peer to contact.
uint16_t proto
The protocol to use.
Opaque VPN handle.
Definition: vpn_api.c:35
Opaque redirection request handle.
Definition: vpn_api.c:77
const void * addr
Target IP address for the redirection, or NULL for redirection to service.
Definition: vpn_api.c:97
Request we should make.
struct GNUNET_NETWORK_Handle * lsock
Socket to use for sending the reply.
size_t udp_msg_size
Number of bytes in udp_msg.
struct GNUNET_SCHEDULER_Task * timeout_task
Task run on timeout or shutdown to clean up without response.
uint16_t original_request_id
ID of the original request.
struct GNUNET_DNSPARSER_Packet * packet
Initially, this is the DNS request, it will then be converted to the DNS response.
const void * addr
Destination address to use.
struct VpnContext * vpn_ctx
Vpn resulution context.
struct GNUNET_DNSSTUB_RequestSocket * dns_lookup
Our DNS request handle.
size_t addr_len
Number of bytes in addr.
struct GNUNET_GNS_LookupWithTldRequest * lookup
Our GNS request handle.
char * udp_msg
Original UDP request message.
Closure for vpn_allocation_cb.
struct GNUNET_VPN_RedirectionRequest * vpn_request
Handle to the VPN request that we were performing.
ssize_t rd_data_size
Number of bytes in rd_data.
struct Request * request
Which resolution process are we processing.
char * rd_data
Serialized records.
unsigned int rd_count
Number of records serialized in rd_data.