GNUnet  0.11.x
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_dnsparser_lib.h>
28 #include <gnunet_gns_service.h>
29 #include <gnunet_dnsstub_lib.h>
30 #include "gns.h"
31 
35 #define TIMEOUT GNUNET_TIME_UNIT_MINUTES
36 
40 struct Request
41 {
46 
50  const void *addr;
51 
57 
62 
67 
73 
77  char *udp_msg;
78 
82  size_t addr_len;
83 
87  size_t udp_msg_size;
88 
93 };
94 
98 static in_addr_t address;
99 
103 static struct in6_addr address6;
104 
105 
110 
115 
120 
125 
129 static struct GNUNET_SCHEDULER_Task *t4;
130 
134 static struct GNUNET_SCHEDULER_Task *t6;
135 
139 static char *dns_ip;
140 
144 static unsigned int listen_port = 53;
145 
149 static const struct GNUNET_CONFIGURATION_Handle *cfg;
150 
151 
157 static void
158 do_shutdown (void *cls)
159 {
160  (void) cls;
161  if (NULL != t4)
162  {
164  t4 = NULL;
165  }
166  if (NULL != t6)
167  {
169  t6 = NULL;
170  }
171  if (NULL != listen_socket4)
172  {
173  GNUNET_NETWORK_socket_close (listen_socket4);
174  listen_socket4 = NULL;
175  }
176  if (NULL != listen_socket6)
177  {
178  GNUNET_NETWORK_socket_close (listen_socket6);
179  listen_socket6 = NULL;
180  }
181  if (NULL != gns)
182  {
183  GNUNET_GNS_disconnect (gns);
184  gns = NULL;
185  }
186  if (NULL != dns_stub)
187  {
188  GNUNET_DNSSTUB_stop (dns_stub);
189  dns_stub = NULL;
190  }
191 }
192 
193 
200 static void
202 {
203  unsigned int idx = request->packet->num_answers;
204  unsigned int r_idx;
205  struct GNUNET_DNSPARSER_Record tmp_answer;
206 
207  while (0 != idx)
208  {
210  request->packet->num_answers);
211  idx--;
212  tmp_answer = request->packet->answers[idx];
213  memcpy (&request->packet->answers[idx], &request->packet->answers[r_idx],
214  sizeof (struct GNUNET_DNSPARSER_Record));
215  memcpy (&request->packet->answers[r_idx], &tmp_answer,
216  sizeof (struct GNUNET_DNSPARSER_Record));
217  }
218 }
219 
220 
226 static void
228 {
229  char *buf;
230  size_t size;
231  ssize_t sret;
232 
233  shuffle_answers (request);
234  if (GNUNET_SYSERR ==
235  GNUNET_DNSPARSER_pack (request->packet,
236  UINT16_MAX /* is this not too much? */,
237  &buf,
238  &size))
239  {
241  _ ("Failed to pack DNS response into UDP packet!\n"));
242  }
243  else
244  {
245  sret = GNUNET_NETWORK_socket_sendto (request->lsock,
246  buf,
247  size,
248  request->addr,
249  request->addr_len);
250  if ((sret < 0) ||
251  (size != (size_t) sret))
253  "sendto");
254  GNUNET_free (buf);
255  }
258  GNUNET_free (request->udp_msg);
259  GNUNET_free (request);
260 }
261 
262 
268 static void
269 do_timeout (void *cls)
270 {
271  struct Request *request = cls;
272 
273  if (NULL != request->packet)
275  if (NULL != request->lookup)
277  if (NULL != request->dns_lookup)
279  GNUNET_free (request->udp_msg);
280  GNUNET_free (request);
281 }
282 
283 
291 static void
293  const struct GNUNET_TUN_DnsHeader *dns,
294  size_t r)
295 {
296  struct Request *request = cls;
297 
298  if (NULL == dns)
299  {
300  /* DNSSTUB gave up, so we trigger timeout early */
302  do_timeout (request);
303  return;
304  }
305  if (request->original_request_id != dns->id)
306  {
307  /* for a another query, ignore */
308  return;
309  }
310  request->packet = GNUNET_DNSPARSER_parse ((char *) dns,
311  r);
312  if (NULL == request->packet)
313  {
315  _ ("Failed to parse DNS response!\n"));
317  do_timeout (request);
318  return;
319  }
321  send_response (request);
322 }
323 
324 
333 static void
334 result_processor (void *cls,
335  int was_gns,
336  uint32_t rd_count,
337  const struct GNUNET_GNSRECORD_Data *rd)
338 {
339  struct Request *request = cls;
341  struct GNUNET_DNSPARSER_Record rec;
342 
343  request->lookup = NULL;
344  if (GNUNET_NO == was_gns)
345  {
346  /* TLD not configured for GNS, fall back to DNS */
348  "Using DNS resolver IP `%s' to resolve `%s'\n",
349  dns_ip,
350  request->packet->queries[0].name);
351  request->original_request_id = request->packet->id;
353  request->packet = NULL;
354  request->dns_lookup = GNUNET_DNSSTUB_resolve (dns_stub,
355  request->udp_msg,
356  request->udp_msg_size,
358  request);
359  return;
360  }
361  packet = request->packet;
362  packet->flags.query_or_response = 1;
364  packet->flags.checking_disabled = 0;
365  packet->flags.authenticated_data = 1;
366  packet->flags.zero = 0;
367  packet->flags.recursion_available = 1;
368  packet->flags.message_truncated = 0;
369  packet->flags.authoritative_answer = 0;
370  // packet->flags.opcode = GNUNET_TUN_DNS_OPCODE_STATUS; // ???
371  for (uint32_t i = 0; i < rd_count; i++)
372  {
374  switch (rd[i].record_type)
375  {
377  GNUNET_assert (sizeof(struct in_addr) == rd[i].data_size);
378  rec.name = GNUNET_strdup (packet->queries[0].name);
381  rec.data.raw.data = GNUNET_new (struct in_addr);
382  GNUNET_memcpy (rec.data.raw.data,
383  rd[i].data,
384  rd[i].data_size);
385  rec.data.raw.data_len = sizeof(struct in_addr);
386  GNUNET_array_append (packet->answers,
387  packet->num_answers,
388  rec);
389  break;
390 
392  GNUNET_assert (sizeof(struct in6_addr) == rd[i].data_size);
393  rec.name = GNUNET_strdup (packet->queries[0].name);
394  rec.data.raw.data = GNUNET_new (struct in6_addr);
397  GNUNET_memcpy (rec.data.raw.data,
398  rd[i].data,
399  rd[i].data_size);
400  rec.data.raw.data_len = sizeof(struct in6_addr);
401  GNUNET_array_append (packet->answers,
402  packet->num_answers,
403  rec);
404  break;
405 
407  rec.name = GNUNET_strdup (packet->queries[0].name);
408  rec.data.hostname = GNUNET_strdup (rd[i].data);
412  rd[i].data,
413  rd[i].data_size);
414  GNUNET_array_append (packet->answers,
415  packet->num_answers,
416  rec);
417  break;
418 
419  default:
420  /* skip */
421  break;
422  }
423  }
424  send_response (request);
425 }
426 
427 
437 static void
439  const void *addr,
440  size_t addr_len,
441  const char *udp_msg,
442  size_t udp_msg_size)
443 {
444  struct Request *request;
446 
447  packet = GNUNET_DNSPARSER_parse (udp_msg,
448  udp_msg_size);
449  if (NULL == packet)
450  {
452  _ ("Cannot parse DNS request from %s\n"),
453  GNUNET_a2s (addr, addr_len));
454  return;
455  }
457  "Received request for `%s' with flags %u, #answers %d, #auth %d, #additional %d\n",
458  packet->queries[0].name,
459  (unsigned int) packet->flags.query_or_response,
460  (int) packet->num_answers,
461  (int) packet->num_authority_records,
462  (int) packet->num_additional_records);
463  if ((0 != packet->flags.query_or_response) ||
464  (0 != packet->num_answers) ||
465  (0 != packet->num_authority_records))
466  {
468  _ ("Received malformed DNS request from %s\n"),
469  GNUNET_a2s (addr, addr_len));
471  return;
472  }
473  if ((1 != packet->num_queries))
474  {
476  _ ("Received unsupported DNS request from %s\n"),
477  GNUNET_a2s (addr,
478  addr_len));
480  return;
481  }
482  request = GNUNET_malloc (sizeof(struct Request) + addr_len);
483  request->lsock = lsock;
484  request->packet = packet;
485  request->addr = &request[1];
486  request->addr_len = addr_len;
487  GNUNET_memcpy (&request[1],
488  addr,
489  addr_len);
490  request->udp_msg_size = udp_msg_size;
491  request->udp_msg = GNUNET_memdup (udp_msg,
492  udp_msg_size);
494  &do_timeout,
495  request);
497  "Calling GNS on `%s'\n",
498  packet->queries[0].name);
499  request->lookup = GNUNET_GNS_lookup_with_tld (gns,
500  packet->queries[0].name,
501  packet->queries[0].type,
504  request);
505 }
506 
507 
513 static void
514 read_dns4 (void *cls)
515 {
516  struct sockaddr_in v4;
517  socklen_t addrlen;
518  ssize_t size;
519  const struct GNUNET_SCHEDULER_TaskContext *tc;
520 
521  GNUNET_assert (listen_socket4 == cls);
523  listen_socket4,
524  &read_dns4,
525  listen_socket4);
528  return; /* shutdown? */
529  size = GNUNET_NETWORK_socket_recvfrom_amount (listen_socket4);
530  if (0 > size)
531  {
532  GNUNET_break (0);
533  return; /* read error!? */
534  }
535  {
536  char buf[size + 1];
537  ssize_t sret;
538 
539  addrlen = sizeof(v4);
540  sret = GNUNET_NETWORK_socket_recvfrom (listen_socket4,
541  buf,
542  size + 1,
543  (struct sockaddr *) &v4,
544  &addrlen);
545  if (0 > sret)
546  {
548  "recvfrom");
549  return;
550  }
551  GNUNET_break (size == sret);
552  handle_request (listen_socket4,
553  &v4,
554  addrlen,
555  buf,
556  size);
557  }
558 }
559 
560 
566 static void
567 read_dns6 (void *cls)
568 {
569  struct sockaddr_in6 v6;
570  socklen_t addrlen;
571  ssize_t size;
572  const struct GNUNET_SCHEDULER_TaskContext *tc;
573 
574  GNUNET_assert (listen_socket6 == cls);
576  listen_socket6,
577  &read_dns6,
578  listen_socket6);
581  return; /* shutdown? */
582  size = GNUNET_NETWORK_socket_recvfrom_amount (listen_socket6);
583  if (0 > size)
584  {
585  GNUNET_break (0);
586  return; /* read error!? */
587  }
588  {
589  char buf[size];
590  ssize_t sret;
591 
592  addrlen = sizeof(v6);
593  sret = GNUNET_NETWORK_socket_recvfrom (listen_socket6,
594  buf,
595  size,
596  (struct sockaddr *) &v6,
597  &addrlen);
598  if (0 > sret)
599  {
601  "recvfrom");
602  return;
603  }
604  GNUNET_break (size == sret);
605  handle_request (listen_socket6,
606  &v6,
607  addrlen,
608  buf,
609  size);
610  }
611 }
612 
613 
622 static void
623 run (void *cls,
624  char *const *args,
625  const char *cfgfile,
626  const struct GNUNET_CONFIGURATION_Handle *c)
627 {
628  char *addr_str;
629 
630  (void) cls;
631  (void) args;
632  (void) cfgfile;
633  cfg = c;
634  if (NULL == dns_ip)
635  {
637  _ ("No DNS server specified!\n"));
638  return;
639  }
641  NULL);
642  if (NULL == (gns = GNUNET_GNS_connect (cfg)))
643  return;
644  GNUNET_assert (NULL != (dns_stub = GNUNET_DNSSTUB_start (128)));
645  if (GNUNET_OK !=
646  GNUNET_DNSSTUB_add_dns_ip (dns_stub,
647  dns_ip))
648  {
649  GNUNET_DNSSTUB_stop (dns_stub);
650  GNUNET_GNS_disconnect (gns);
651  gns = NULL;
652  return;
653  }
654 
655  /* Get address to bind to */
657  "BIND_TO",
658  &addr_str))
659  {
660  // No address specified
662  "Don't know what to bind to...\n");
663  GNUNET_free (addr_str);
665  return;
666  }
667  if (1 != inet_pton (AF_INET, addr_str, &address))
668  {
670  "Unable to parse address %s\n",
671  addr_str);
672  GNUNET_free (addr_str);
674  return;
675  }
676  GNUNET_free (addr_str);
677  /* Get address to bind to */
679  "BIND_TO6",
680  &addr_str))
681  {
682  // No address specified
684  "Don't know what to bind6 to...\n");
685  GNUNET_free (addr_str);
687  return;
688  }
689  if (1 != inet_pton (AF_INET6, addr_str, &address6))
690  {
692  "Unable to parse IPv6 address %s\n",
693  addr_str);
694  GNUNET_free (addr_str);
696  return;
697  }
698  GNUNET_free (addr_str);
699 
700  listen_socket4 = GNUNET_NETWORK_socket_create (PF_INET,
701  SOCK_DGRAM,
702  IPPROTO_UDP);
703  if (NULL != listen_socket4)
704  {
705  struct sockaddr_in v4;
706 
707  memset (&v4, 0, sizeof(v4));
708  v4.sin_family = AF_INET;
709  v4.sin_addr.s_addr = address;
710 #if HAVE_SOCKADDR_IN_SIN_LEN
711  v4.sin_len = sizeof(v4);
712 #endif
713  v4.sin_port = htons (listen_port);
714  if (GNUNET_OK !=
715  GNUNET_NETWORK_socket_bind (listen_socket4,
716  (struct sockaddr *) &v4,
717  sizeof(v4)))
718  {
720  GNUNET_NETWORK_socket_close (listen_socket4);
721  listen_socket4 = NULL;
722  }
723  }
724  listen_socket6 = GNUNET_NETWORK_socket_create (PF_INET6,
725  SOCK_DGRAM,
726  IPPROTO_UDP);
727  if (NULL != listen_socket6)
728  {
729  struct sockaddr_in6 v6;
730 
731  memset (&v6, 0, sizeof(v6));
732  v6.sin6_family = AF_INET6;
733  v6.sin6_addr = address6;
734 #if HAVE_SOCKADDR_IN_SIN_LEN
735  v6.sin6_len = sizeof(v6);
736 #endif
737  v6.sin6_port = htons (listen_port);
738  if (GNUNET_OK !=
739  GNUNET_NETWORK_socket_bind (listen_socket6,
740  (struct sockaddr *) &v6,
741  sizeof(v6)))
742  {
744  GNUNET_NETWORK_socket_close (listen_socket6);
745  listen_socket6 = NULL;
746  }
747  }
748  if ((NULL == listen_socket4) &&
749  (NULL == listen_socket6))
750  {
751  GNUNET_GNS_disconnect (gns);
752  gns = NULL;
753  GNUNET_DNSSTUB_stop (dns_stub);
754  dns_stub = NULL;
755  return;
756  }
757  if (NULL != listen_socket4)
759  listen_socket4,
760  &read_dns4,
761  listen_socket4);
762  if (NULL != listen_socket6)
764  listen_socket6,
765  &read_dns6,
766  listen_socket6);
767 }
768 
769 
777 int
778 main (int argc,
779  char *const *argv)
780 {
781  struct GNUNET_GETOPT_CommandLineOption options[] = {
783  "dns",
784  "IP",
785  gettext_noop (
786  "IP of recursive DNS resolver to use (required)"),
787  &dns_ip),
789  "port",
790  "UDPPORT",
791  gettext_noop (
792  "UDP port to listen on for inbound DNS requests; default: 2853"),
793  &listen_port),
795  };
796  int ret;
797 
798  if (GNUNET_OK !=
799  GNUNET_STRINGS_get_utf8_args (argc, argv,
800  &argc, &argv))
801  return 2;
802  GNUNET_log_setup ("gnunet-dns2gns",
803  "WARNING",
804  NULL);
805  ret =
806  (GNUNET_OK ==
807  GNUNET_PROGRAM_run (argc, argv,
808  "gnunet-dns2gns",
809  _ ("GNUnet DNS-to-GNS proxy (a DNS server)"),
810  options,
811  &run, NULL)) ? 0 : 1;
812  GNUNET_free_nz ((void *) argv);
813  return ret;
814 }
815 
816 
817 /* end of gnunet-dns2gns.c */
Connection to the GNS service.
Definition: gns_api.h:35
struct GNUNET_DNSPARSER_Record * answers
Array of all answers in the packet, must contain "num_answers" entries.
const struct GNUNET_SCHEDULER_TaskContext * GNUNET_SCHEDULER_get_task_context(void)
Obtain the reasoning why the current task was started.
Definition: scheduler.c:752
uint16_t type
See GNUNET_DNSPARSER_TYPE_*.
unsigned int zero
Always zero.
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.
uint16_t type
See GNUNET_DNSPARSER_TYPE_*.
static struct GNUNET_VPN_RedirectionRequest * request
Opaque redirection request handle.
Definition: gnunet-vpn.c:41
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, parse options).
Definition: program.c:363
static unsigned int listen_port
UDP Port we listen on for inbound DNS requests.
#define GNUNET_array_append(arr, len, element)
Append an element to an array (growing the array by one).
#define GNUNET_DNSPARSER_TYPE_CNAME
static void read_dns6(void *cls)
Task to read IPv6 DNS packets.
The reading socket is ready.
Context information passed to each scheduler task.
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, or when GNUNET_SCHEDULER_shutdown() is being invoked.
Definition: scheduler.c:1331
static char * dns_ip
IP of DNS server.
static void read_dns4(void *cls)
Task to read IPv4 DNS packets.
void * GNUNET_GNS_lookup_with_tld_cancel(struct GNUNET_GNS_LookupWithTldRequest *ltr)
Cancel pending lookup request.
Definition: gns_tld_api.c:332
unsigned int return_code
See GNUNET_TUN_DNS_RETURN_CODE_ defines.
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
uint32_t GNUNET_CRYPTO_random_u32(enum GNUNET_CRYPTO_Quality mode, uint32_t i)
Produce a random value.
int main(int argc, char *const *argv)
The main function for the dns2gns daemon.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void GNUNET_DNSSTUB_stop(struct GNUNET_DNSSTUB_Context *ctx)
Cleanup DNSSTUB resolver.
Definition: dnsstub.c:690
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:1257
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:423
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:591
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:1209
int 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:485
uint16_t id
DNS ID (to match replies to requests).
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Main function that will be run.
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
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
void GNUNET_DNSPARSER_free_packet(struct GNUNET_DNSPARSER_Packet *p)
Free memory taken by a packet.
Definition: dnsparser.c:854
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
size_t data_size
Number of bytes in data.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Definition of a command line option.
static struct GNUNET_NETWORK_Handle * listen_socket4
Listen socket for IPv4.
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:531
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.
unsigned int recursion_available
Set to 1 if recursion is available (server -> client)
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
unsigned int num_answers
Number of answers in the packet, should be 0 for queries.
uint64_t abs_value_us
The actual value.
uint16_t id
Unique identifier for the request/response.
IPC messages between GNS API and GNS service.
enum GNUNET_SCHEDULER_Reason reason
Reason why the task is run now.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
unsigned int authoritative_answer
Set to 1 if this is an authoritative answer.
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.
const void * addr
Destination address to use.
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.
static void send_response(struct Request *request)
Send the response for the given request and clean up.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178
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.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
struct GNUNET_GNS_Handle * gns
Handle to GNS resolver.
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:1269
#define TIMEOUT
Timeout for DNS requests.
struct GNUNET_SCHEDULER_Task * timeout_task
Task run on timeout or shutdown to clean up without response.
unsigned int authenticated_data
Response has been cryptographically verified, RFC 4035.
unsigned int query_or_response
query:0, response:1
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration to use.
char * name
Name of the record that the query is for (0-terminated).
char * hostname
For NS, CNAME and PTR records, this is the uncompressed 0-terminated hostname.
const void * data
Binary value stored in the DNS record.
unsigned int num_additional_records
Number of additional records in the packet, should be 0 for queries.
static in_addr_t address
The address to bind to.
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
struct GNUNET_DNSSTUB_Context * GNUNET_DNSSTUB_start(unsigned int num_sockets)
Start a DNS stub resolver.
Definition: dnsstub.c:564
uint64_t expiration_time
Expiration time for the DNS record.
static struct GNUNET_SCHEDULER_Task * t4
Task for IPv4 socket.
void GNUNET_GNS_disconnect(struct GNUNET_GNS_Handle *handle)
Shutdown connection with the GNS service.
Definition: gns_api.c:290
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:846
static void do_timeout(void *cls)
Task run on timeout.
#define GNUNET_TUN_DNS_RETURN_CODE_NO_ERROR
RFC 1035 codes.
static char buf[2048]
union GNUNET_DNSPARSER_Record::@24 data
Payload of the record (which one of these is valid depends on the &#39;type&#39;).
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
unsigned int message_truncated
Set to 1 if message is truncated.
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)...
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
A DNS response record.
Handle to the stub resolver.
Definition: dnsstub.c:123
struct GNUNET_DNSPARSER_Query * queries
Array of all queries in the packet, must contain "num_queries" entries.
struct GNUNET_DNSPARSER_Packet * packet
Initially, this is the DNS request, it will then be converted to the DNS response.
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:504
#define GNUNET_free_nz(ptr)
Wrapper around free.
static unsigned int size
Size of the "table".
Definition: peer.c:67
size_t data_len
Number of bytes in data.
void * data
Binary record data.
unsigned int num_authority_records
Number of authoritative answers in the packet, should be 0 for queries.
size_t udp_msg_size
Number of bytes in udp_msg.
#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&#39;r...
struct GNUNET_TIME_Absolute expiration_time
When does the record expire?
Request we should make.
static void do_shutdown(void *cls)
Task run on shutdown.
#define GNUNET_DNSPARSER_TYPE_AAAA
configuration data
Definition: configuration.c:84
void GNUNET_DNSSTUB_resolve_cancel(struct GNUNET_DNSSTUB_RequestSocket *rs)
Cancel DNS resolution.
Definition: dnsstub.c:540
struct GNUNET_DNSSTUB_RequestSocket * dns_lookup
Our DNS request handle.
Easy-to-process, parsed version of a DNS packet.
#define GNUNET_log(kind,...)
Entry in list of pending tasks.
Definition: scheduler.c:134
size_t addr_len
Number of bytes in addr.
uint16_t dns_traffic_class
See GNUNET_TUN_DNS_CLASS_*.
static struct GNUNET_NETWORK_Handle * listen_socket6
Listen socket for IPv6.
struct GNUNET_NETWORK_Handle * lsock
Socket to use for sending the reply.
handle to a socket
Definition: network.c:52
char * name
Name of the record that the query is for (0-terminated).
unsigned int num_queries
Number of queries in the packet.
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:727
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:1517
Defaults, look in cache, then in DHT.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_uint(char shortName, const char *name, const char *argumentHelp, const char *description, unsigned int *val)
Allow user to specify an unsigned int.
struct GNUNET_TUN_DnsFlags flags
Bitfield of DNS flags.
int GNUNET_log_setup(const char *comp, const char *loglevel, const char *logfile)
Setup logging.
UDP socket we are using for sending DNS requests to the Internet.
Definition: dnsstub.c:44
static void shuffle_answers(struct Request *request)
Shuffle answers Fisher-Yates (aka Knuth) Shuffle.
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:754
Handle to a lookup request.
Definition: gns_tld_api.c:44
uint32_t data
The data value.
struct GNUNET_GNS_LookupWithTldRequest * lookup
Our GNS request handle.
struct GNUNET_DNSSTUB_Context * dns_stub
Stub resolver.
struct GNUNET_DNSPARSER_RawRecord raw
Raw data for all other types.
#define GNUNET_DNSPARSER_TYPE_A
char * udp_msg
Original UDP request message.
unsigned int checking_disabled
See RFC 4035.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:560
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
static struct GNUNET_SCHEDULER_Task * t6
Task for IPv6 socket.
static struct in6_addr address6
The IPv6 address to bind to.
#define gettext_noop(String)
Definition: gettext.h:69
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:909
uint16_t original_request_id
ID of the original request.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972