GNUnet  0.10.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 
106 
111 
116 
121 
126 
130 static struct GNUNET_SCHEDULER_Task *t4;
131 
135 static struct GNUNET_SCHEDULER_Task *t6;
136 
140 static char *dns_ip;
141 
145 static unsigned int listen_port = 53;
146 
150 static const struct GNUNET_CONFIGURATION_Handle *cfg;
151 
152 
158 static void
159 do_shutdown (void *cls)
160 {
161  (void) cls;
162  if (NULL != t4)
163  {
165  t4 = NULL;
166  }
167  if (NULL != t6)
168  {
170  t6 = NULL;
171  }
172  if (NULL != listen_socket4)
173  {
174  GNUNET_NETWORK_socket_close (listen_socket4);
175  listen_socket4 = NULL;
176  }
177  if (NULL != listen_socket6)
178  {
179  GNUNET_NETWORK_socket_close (listen_socket6);
180  listen_socket6 = NULL;
181  }
182  if (NULL != gns)
183  {
184  GNUNET_GNS_disconnect (gns);
185  gns = NULL;
186  }
187  if (NULL != dns_stub)
188  {
189  GNUNET_DNSSTUB_stop (dns_stub);
190  dns_stub = NULL;
191  }
192 }
193 
194 
200 static void
202 {
203  char *buf;
204  size_t size;
205  ssize_t sret;
206 
207  if (GNUNET_SYSERR ==
208  GNUNET_DNSPARSER_pack (request->packet,
209  UINT16_MAX /* is this not too much? */,
210  &buf,
211  &size))
212  {
214  _("Failed to pack DNS response into UDP packet!\n"));
215  }
216  else
217  {
218  sret = GNUNET_NETWORK_socket_sendto (request->lsock,
219  buf,
220  size,
221  request->addr,
222  request->addr_len);
223  if ( (sret < 0) ||
224  (size != (size_t) sret) )
226  "sendto");
227  GNUNET_free (buf);
228  }
231  GNUNET_free (request->udp_msg);
232  GNUNET_free (request);
233 }
234 
235 
241 static void
242 do_timeout (void *cls)
243 {
244  struct Request *request = cls;
245 
246  if (NULL != request->packet)
248  if (NULL != request->lookup)
250  if (NULL != request->dns_lookup)
252  GNUNET_free (request->udp_msg);
253  GNUNET_free (request);
254 }
255 
256 
264 static void
266  const struct GNUNET_TUN_DnsHeader *dns,
267  size_t r)
268 {
269  struct Request *request = cls;
270 
271  if (NULL == dns)
272  {
273  /* DNSSTUB gave up, so we trigger timeout early */
275  do_timeout (request);
276  return;
277  }
278  if (request->original_request_id != dns->id)
279  {
280  /* for a another query, ignore */
281  return;
282  }
283  request->packet = GNUNET_DNSPARSER_parse ((char*)dns,
284  r);
286  send_response (request);
287 }
288 
289 
298 static void
299 result_processor (void *cls,
300  int was_gns,
301  uint32_t rd_count,
302  const struct GNUNET_GNSRECORD_Data *rd)
303 {
304  struct Request *request = cls;
306  struct GNUNET_DNSPARSER_Record rec;
307 
308  request->lookup = NULL;
309  if (GNUNET_NO == was_gns)
310  {
311  /* TLD not configured for GNS, fall back to DNS */
313  "Using DNS resolver IP `%s' to resolve `%s'\n",
314  dns_ip,
315  request->packet->queries[0].name);
316  request->original_request_id = request->packet->id;
318  request->packet = NULL;
319  request->dns_lookup = GNUNET_DNSSTUB_resolve (dns_stub,
320  request->udp_msg,
321  request->udp_msg_size,
323  request);
324  return;
325  }
326  packet = request->packet;
327  packet->flags.query_or_response = 1;
329  packet->flags.checking_disabled = 0;
330  packet->flags.authenticated_data = 1;
331  packet->flags.zero = 0;
332  packet->flags.recursion_available = 1;
333  packet->flags.message_truncated = 0;
334  packet->flags.authoritative_answer = 0;
335  //packet->flags.opcode = GNUNET_TUN_DNS_OPCODE_STATUS; // ???
336  for (uint32_t i=0;i<rd_count;i++)
337  {
338  // FIXME: do we need to hanlde #GNUNET_GNSRECORD_RF_SHADOW_RECORD
339  // here? Or should we do this in libgnunetgns?
341  switch (rd[i].record_type)
342  {
344  GNUNET_assert (sizeof (struct in_addr) == rd[i].data_size);
345  rec.name = GNUNET_strdup (packet->queries[0].name);
348  rec.data.raw.data = GNUNET_new (struct in_addr);
349  GNUNET_memcpy (rec.data.raw.data,
350  rd[i].data,
351  rd[i].data_size);
352  rec.data.raw.data_len = sizeof (struct in_addr);
353  GNUNET_array_append (packet->answers,
354  packet->num_answers,
355  rec);
356  break;
358  GNUNET_assert (sizeof (struct in6_addr) == rd[i].data_size);
359  rec.name = GNUNET_strdup (packet->queries[0].name);
360  rec.data.raw.data = GNUNET_new (struct in6_addr);
363  GNUNET_memcpy (rec.data.raw.data,
364  rd[i].data,
365  rd[i].data_size);
366  rec.data.raw.data_len = sizeof (struct in6_addr);
367  GNUNET_array_append (packet->answers,
368  packet->num_answers,
369  rec);
370  break;
372  rec.name = GNUNET_strdup (packet->queries[0].name);
373  rec.data.hostname = GNUNET_strdup (rd[i].data);
377  rd[i].data,
378  rd[i].data_size);
379  GNUNET_array_append (packet->answers,
380  packet->num_answers,
381  rec);
382  break;
383  default:
384  /* skip */
385  break;
386  }
387  }
388  send_response (request);
389 }
390 
391 
401 static void
403  const void *addr,
404  size_t addr_len,
405  const char *udp_msg,
406  size_t udp_msg_size)
407 {
408  struct Request *request;
410 
411  packet = GNUNET_DNSPARSER_parse (udp_msg,
412  udp_msg_size);
413  if (NULL == packet)
414  {
416  _("Cannot parse DNS request from %s\n"),
417  GNUNET_a2s (addr, addr_len));
418  return;
419  }
421  "Received request for `%s' with flags %u, #answers %d, #auth %d, #additional %d\n",
422  packet->queries[0].name,
423  (unsigned int) packet->flags.query_or_response,
424  (int) packet->num_answers,
425  (int) packet->num_authority_records,
426  (int) packet->num_additional_records);
427  if ( (0 != packet->flags.query_or_response) ||
428  (0 != packet->num_answers) ||
429  (0 != packet->num_authority_records))
430  {
432  _("Received malformed DNS request from %s\n"),
433  GNUNET_a2s (addr, addr_len));
435  return;
436  }
437  if ( (1 != packet->num_queries) )
438  {
440  _("Received unsupported DNS request from %s\n"),
441  GNUNET_a2s (addr,
442  addr_len));
444  return;
445  }
446  request = GNUNET_malloc (sizeof (struct Request) + addr_len);
447  request->lsock = lsock;
448  request->packet = packet;
449  request->addr = &request[1];
450  request->addr_len = addr_len;
451  GNUNET_memcpy (&request[1],
452  addr,
453  addr_len);
454  request->udp_msg_size = udp_msg_size;
455  request->udp_msg = GNUNET_memdup (udp_msg,
456  udp_msg_size);
458  &do_timeout,
459  request);
461  "Calling GNS on `%s'\n",
462  packet->queries[0].name);
463  request->lookup = GNUNET_GNS_lookup_with_tld (gns,
464  packet->queries[0].name,
465  packet->queries[0].type,
466  GNUNET_NO,
468  request);
469 }
470 
471 
477 static void
478 read_dns4 (void *cls)
479 {
480  struct sockaddr_in v4;
481  socklen_t addrlen;
482  ssize_t size;
483  const struct GNUNET_SCHEDULER_TaskContext *tc;
484 
485  GNUNET_assert (listen_socket4 == cls);
487  listen_socket4,
488  &read_dns4,
489  listen_socket4);
492  return; /* shutdown? */
493  size = GNUNET_NETWORK_socket_recvfrom_amount (listen_socket4);
494  if (0 > size)
495  {
496  GNUNET_break (0);
497  return; /* read error!? */
498  }
499  {
500  char buf[size + 1];
501  ssize_t sret;
502 
503  addrlen = sizeof (v4);
504  sret = GNUNET_NETWORK_socket_recvfrom (listen_socket4,
505  buf,
506  size + 1,
507  (struct sockaddr *) &v4,
508  &addrlen);
509  if (0 > sret)
510  {
512  "recvfrom");
513  return;
514  }
515  GNUNET_break (size == sret);
516  handle_request (listen_socket4,
517  &v4,
518  addrlen,
519  buf,
520  size);
521  }
522 }
523 
524 
530 static void
531 read_dns6 (void *cls)
532 {
533  struct sockaddr_in6 v6;
534  socklen_t addrlen;
535  ssize_t size;
536  const struct GNUNET_SCHEDULER_TaskContext *tc;
537 
538  GNUNET_assert (listen_socket6 == cls);
540  listen_socket6,
541  &read_dns6,
542  listen_socket6);
545  return; /* shutdown? */
546  size = GNUNET_NETWORK_socket_recvfrom_amount (listen_socket6);
547  if (0 > size)
548  {
549  GNUNET_break (0);
550  return; /* read error!? */
551  }
552  {
553  char buf[size];
554  ssize_t sret;
555 
556  addrlen = sizeof (v6);
557  sret = GNUNET_NETWORK_socket_recvfrom (listen_socket6,
558  buf,
559  size,
560  (struct sockaddr *) &v6,
561  &addrlen);
562  if (0 > sret)
563  {
565  "recvfrom");
566  return;
567  }
568  GNUNET_break (size == sret);
569  handle_request (listen_socket6,
570  &v6,
571  addrlen,
572  buf,
573  size);
574  }
575 }
576 
577 
586 static void
587 run (void *cls,
588  char *const *args,
589  const char *cfgfile,
590  const struct GNUNET_CONFIGURATION_Handle *c)
591 {
592  char *addr_str;
593  (void) cls;
594  (void) args;
595  (void) cfgfile;
596  cfg = c;
597  if (NULL == dns_ip)
598  {
600  _("No DNS server specified!\n"));
601  return;
602  }
604  NULL);
605  if (NULL == (gns = GNUNET_GNS_connect (cfg)))
606  return;
607  GNUNET_assert (NULL != (dns_stub = GNUNET_DNSSTUB_start (128)));
608  if (GNUNET_OK !=
609  GNUNET_DNSSTUB_add_dns_ip (dns_stub,
610  dns_ip))
611  {
612  GNUNET_DNSSTUB_stop (dns_stub);
613  GNUNET_GNS_disconnect (gns);
614  gns = NULL;
615  return;
616  }
617 
618  /* Get address to bind to */
620  "BIND_TO",
621  &addr_str))
622  {
623  //No address specified
625  "Don't know what to bind to...\n");
626  GNUNET_free (addr_str);
628  return;
629  }
630  if (1 != inet_pton (AF_INET, addr_str, &address))
631  {
633  "Unable to parse address %s\n",
634  addr_str);
635  GNUNET_free (addr_str);
637  return;
638  }
639  GNUNET_free (addr_str);
640  /* Get address to bind to */
642  "BIND_TO6",
643  &addr_str))
644  {
645  //No address specified
647  "Don't know what to bind6 to...\n");
648  GNUNET_free (addr_str);
650  return;
651  }
652  if (1 != inet_pton (AF_INET6, addr_str, &address6))
653  {
655  "Unable to parse IPv6 address %s\n",
656  addr_str);
657  GNUNET_free (addr_str);
659  return;
660  }
661  GNUNET_free (addr_str);
662 
663  listen_socket4 = GNUNET_NETWORK_socket_create (PF_INET,
664  SOCK_DGRAM,
665  IPPROTO_UDP);
666  if (NULL != listen_socket4)
667  {
668  struct sockaddr_in v4;
669 
670  memset (&v4, 0, sizeof (v4));
671  v4.sin_family = AF_INET;
672  v4.sin_addr.s_addr = address;
673 #if HAVE_SOCKADDR_IN_SIN_LEN
674  v4.sin_len = sizeof (v4);
675 #endif
676  v4.sin_port = htons (listen_port);
677  if (GNUNET_OK !=
678  GNUNET_NETWORK_socket_bind (listen_socket4,
679  (struct sockaddr *) &v4,
680  sizeof (v4)))
681  {
683  GNUNET_NETWORK_socket_close (listen_socket4);
684  listen_socket4 = NULL;
685  }
686  }
687  listen_socket6 = GNUNET_NETWORK_socket_create (PF_INET6,
688  SOCK_DGRAM,
689  IPPROTO_UDP);
690  if (NULL != listen_socket6)
691  {
692  struct sockaddr_in6 v6;
693 
694  memset (&v6, 0, sizeof (v6));
695  v6.sin6_family = AF_INET6;
696  v6.sin6_addr = address6;
697 #if HAVE_SOCKADDR_IN_SIN_LEN
698  v6.sin6_len = sizeof (v6);
699 #endif
700  v6.sin6_port = htons (listen_port);
701  if (GNUNET_OK !=
702  GNUNET_NETWORK_socket_bind (listen_socket6,
703  (struct sockaddr *) &v6,
704  sizeof (v6)))
705  {
707  GNUNET_NETWORK_socket_close (listen_socket6);
708  listen_socket6 = NULL;
709  }
710  }
711  if ( (NULL == listen_socket4) &&
712  (NULL == listen_socket6) )
713  {
714  GNUNET_GNS_disconnect (gns);
715  gns = NULL;
716  GNUNET_DNSSTUB_stop (dns_stub);
717  dns_stub = NULL;
718  return;
719  }
720  if (NULL != listen_socket4)
722  listen_socket4,
723  &read_dns4,
724  listen_socket4);
725  if (NULL != listen_socket6)
727  listen_socket6,
728  &read_dns6,
729  listen_socket6);
730 }
731 
732 
740 int
741 main (int argc,
742  char *const *argv)
743 {
744  struct GNUNET_GETOPT_CommandLineOption options[] = {
746  "dns",
747  "IP",
748  gettext_noop ("IP of recursive DNS resolver to use (required)"),
749  &dns_ip),
751  "port",
752  "UDPPORT",
753  gettext_noop ("UDP port to listen on for inbound DNS requests; default: 2853"),
754  &listen_port),
756  };
757  int ret;
758 
759  if (GNUNET_OK !=
760  GNUNET_STRINGS_get_utf8_args (argc, argv,
761  &argc, &argv))
762  return 2;
763  GNUNET_log_setup ("gnunet-dns2gns",
764  "WARNING",
765  NULL);
766  ret =
767  (GNUNET_OK ==
768  GNUNET_PROGRAM_run (argc, argv,
769  "gnunet-dns2gns",
770  _("GNUnet DNS-to-GNS proxy (a DNS server)"),
771  options,
772  &run, NULL)) ? 0 : 1;
773  GNUNET_free ((void*) argv);
774  return ret;
775 }
776 
777 /* 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:746
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
static unsigned int listen_port
UDP Port we listen on for inbound DNS requests.
#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:1293
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:330
unsigned int return_code
See GNUNET_TUN_DNS_RETURN_CODE_ defines.
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1521
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:731
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
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:417
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:622
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:522
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:242
void GNUNET_DNSPARSER_free_packet(struct GNUNET_DNSPARSER_Packet *p)
Free memory taken by a packet.
Definition: dnsparser.c:854
#define GNUNET_NO
Definition: gnunet_common.h:81
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:78
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:524
static int ret
Final status code.
Definition: gnunet-arm.c:89
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:208
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:1246
#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.
#define GNUNET_memcpy(dst, src, n)
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:662
struct GNUNET_DNSSTUB_Context * GNUNET_DNSSTUB_start(unsigned int num_sockets)
Start a DNS stub resolver.
Definition: dnsstub.c:595
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:285
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:968
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]
#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:263
A DNS response record.
Handle to the stub resolver.
Definition: dnsstub.c:125
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.
int 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.
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:533
#define GNUNET_SYSERR
Definition: gnunet_common.h:79
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.
#define GNUNET_array_append(arr, size, element)
Append an element to a list (growing the list by one).
static void do_shutdown(void *cls)
Task run on shutdown.
#define GNUNET_DNSPARSER_TYPE_AAAA
configuration data
Definition: configuration.c:85
void GNUNET_DNSSTUB_resolve_cancel(struct GNUNET_DNSSTUB_RequestSocket *rs)
Cancel DNS resolution.
Definition: dnsstub.c:571
struct GNUNET_DNSSTUB_RequestSocket * dns_lookup
Our DNS request handle.
Easy-to-process, parsed version of a DNS packet.
static int inet_pton(int af, const char *cp, struct in_addr *buf)
Convert IPv4 address from text to binary form.
#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:46
int 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:361
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:818
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:1478
union GNUNET_DNSPARSER_Record::@27 data
Payload of the record (which one of these is valid depends on the &#39;type&#39;).
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:43
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:856
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.
static size_t data_size
Number of bytes in data.
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:604
#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:1037
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:965