GNUnet  0.11.x
gnunet-gns.c
Go to the documentation of this file.
1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2012-2013, 2017-2018 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 #if HAVE_LIBIDN2
27 #if HAVE_IDN2_H
28 #include <idn2.h>
29 #elif HAVE_IDN2_IDN2_H
30 #include <idn2/idn2.h>
31 #endif
32 #elif HAVE_LIBIDN
33 #if HAVE_IDNA_H
34 #include <idna.h>
35 #elif HAVE_IDN_IDNA_H
36 #include <idn/idna.h>
37 #endif
38 #endif
39 #include <gnunet_util_lib.h>
40 #include <gnunet_dnsparser_lib.h>
41 #include <gnunet_gnsrecord_lib.h>
43 #include <gnunet_gns_service.h>
44 
45 
49 static const struct GNUNET_CONFIGURATION_Handle *cfg;
50 
54 static struct GNUNET_GNS_Handle *gns;
55 
59 static char *lookup_name;
60 
64 char *idna_name;
65 
69 static int dns_compat;
70 
74 static char *lookup_type;
75 
79 static int raw;
80 
84 static uint32_t rtype;
85 
90 
95 
100 
108 static int global_ret;
109 
110 
116 static void
117 do_shutdown (void *cls)
118 {
119  (void) cls;
120  if (NULL != to_task)
121  {
122  GNUNET_SCHEDULER_cancel (to_task);
123  to_task = NULL;
124  }
125  if (NULL != lr)
126  {
128  lr = NULL;
129  }
130  if (NULL != gns)
131  {
132  GNUNET_GNS_disconnect (gns);
133  gns = NULL;
134  }
135  if (NULL != idna_name)
136  {
138  idna_name = NULL;
139  }
140 }
141 
142 
148 static void
149 do_timeout (void*cls)
150 {
151  to_task = NULL;
152  global_ret = 3; // Timeout
154 }
155 
156 
165 static void
167  int was_gns,
168  uint32_t rd_count,
169  const struct GNUNET_GNSRECORD_Data *rd)
170 {
171  const char *name = cls;
172  const char *typename;
173  char *string_val;
174 
175  lr = NULL;
176  if (GNUNET_NO == was_gns)
177  {
178  global_ret = 4; /* not for GNS */
180  return;
181  }
182  if (! raw)
183  {
184  if (0 == rd_count)
185  printf ("No results.\n");
186  else
187  printf ("%s:\n", name);
188  }
189  for (uint32_t i = 0; i < rd_count; i++)
190  {
191  if ((rd[i].record_type != rtype) && (GNUNET_GNSRECORD_TYPE_ANY != rtype))
192  continue;
193  typename = GNUNET_GNSRECORD_number_to_typename (rd[i].record_type);
194  string_val = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
195  rd[i].data,
196  rd[i].data_size);
197  if (NULL == string_val)
198  {
199  fprintf (stderr,
200  "Record %u of type %d malformed, skipping\n",
201  (unsigned int) i,
202  (int) rd[i].record_type);
203  continue;
204  }
205  if (raw)
206  printf ("%s\n", string_val);
207  else
208  printf ("Got `%s' record: %s\n", typename, string_val);
209  GNUNET_free (string_val);
210  }
212 }
213 
214 
223 static void
224 run (void *cls,
225  char *const *args,
226  const char *cfgfile,
227  const struct GNUNET_CONFIGURATION_Handle *c)
228 {
229  (void) cls;
230  (void) args;
231  (void) cfgfile;
232 
233  cfg = c;
234  to_task = NULL;
235  {
236  char *colon;
237 
238  if (NULL != (colon = strchr (lookup_name, ':')))
239  *colon = '\0';
240  }
241 
246  if (GNUNET_YES == dns_compat)
247  {
248  Idna_rc rc;
249 
251  {
252  fprintf (stderr,
253  _ ("`%s' is not a valid DNS domain name\n"),
254  lookup_name);
255  global_ret = 3;
256  return;
257  }
258  if (IDNA_SUCCESS !=
259  (rc = idna_to_unicode_8z8z (lookup_name, &idna_name,
260  IDNA_ALLOW_UNASSIGNED)))
261  {
262  fprintf (stderr,
263  _ ("Failed to convert DNS IDNA name `%s' to UTF-8: %s\n"),
264  lookup_name,
265  idna_strerror (rc));
266  global_ret = 4;
267  return;
268  }
270  }
271 
272  if (GNUNET_YES !=
273  GNUNET_CLIENT_test (cfg,
274  "arm"))
275  {
277  _ ("Cannot resolve using GNS: GNUnet peer not running\n"));
278  global_ret = 2;
279  return;
280  }
282  &do_timeout,
283  NULL);
284  gns = GNUNET_GNS_connect (cfg);
285  if (NULL == gns)
286  {
287  fprintf (stderr,
288  _ ("Failed to connect to GNS\n"));
289  global_ret = 2;
290  return;
291  }
293  NULL);
294  if (NULL != lookup_type)
296  else
298  if (UINT32_MAX == rtype)
299  {
300  fprintf (stderr,
301  _ ("Invalid typename specified, assuming `ANY'\n"));
303  }
304  lr = GNUNET_GNS_lookup_with_tld (gns,
305  lookup_name,
306  rtype,
309  lookup_name);
310  if (NULL == lr)
311  {
312  global_ret = 2;
314  return;
315  }
316 }
317 
318 
326 int
327 main (int argc, char *const *argv)
328 {
330  struct GNUNET_GETOPT_CommandLineOption options[] =
333  "lookup",
334  "NAME",
335  gettext_noop (
336  "Lookup a record for the given name"),
337  &lookup_name)),
339  "type",
340  "TYPE",
341  gettext_noop (
342  "Specify the type of the record to lookup"),
343  &lookup_type),
345  "timeout",
346  "TIMEOUT",
347  gettext_noop (
348  "Specify a timeout for the lookup"),
349  &timeout),
351  "raw",
352  gettext_noop ("No unneeded output"),
353  &raw),
355  "dns",
356  gettext_noop (
357  "DNS Compatibility: Name is passed in IDNA instead of UTF-8"),
358  &dns_compat),
360  int ret;
361 
362  if (GNUNET_OK !=
363  GNUNET_STRINGS_get_utf8_args (argc, argv,
364  &argc, &argv))
365  return 2;
366 
367  GNUNET_log_setup ("gnunet-gns", "WARNING", NULL);
368  ret = GNUNET_PROGRAM_run (argc,
369  argv,
370  "gnunet-gns",
371  _ ("GNUnet GNS resolver tool"),
372  options,
373  &run,
374  NULL);
375  GNUNET_free ((void *) argv);
376  if (GNUNET_OK != ret)
377  return 1;
378  return global_ret;
379 }
380 
381 
382 /* end of gnunet-gns.c */
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_relative_time(char shortName, const char *name, const char *argumentHelp, const char *description, struct GNUNET_TIME_Relative *val)
Allow user to specify a struct GNUNET_TIME_Relative (using human-readable "fancy" time)...
Connection to the GNS service.
Definition: gns_api.h:35
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Main function that will be run.
Definition: gnunet-gns.c:224
static int raw
raw output
Definition: gnunet-gns.c:79
static struct GNUNET_GNS_LookupWithTldRequest * lr
Handle to lookup request.
Definition: gnunet-gns.c:99
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:1300
void * GNUNET_GNS_lookup_with_tld_cancel(struct GNUNET_GNS_LookupWithTldRequest *ltr)
Cancel pending lookup request.
Definition: gns_tld_api.c:329
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1438
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
uint32_t GNUNET_GNSRECORD_typename_to_number(const char *dns_typename)
Convert a type name (i.e.
Definition: gnsrecord.c:204
int main(int argc, char *const *argv)
The main function for gnunet-gns.
Definition: gnunet-gns.c:327
#define GNUNET_GNSRECORD_TYPE_ANY
Record type indicating any record/&#39;*&#39;.
static int dns_compat
DNS compatibility (name is given as DNS name, possible IDNA).
Definition: gnunet-gns.c:69
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
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
Definition of a command line option.
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:526
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
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.
#define _(String)
GNU gettext support macro.
Definition: platform.h:180
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:1253
static struct GNUNET_TIME_Relative timeout
Timeout for lookup.
Definition: gnunet-gns.c:89
static struct GNUNET_GNS_Handle * gns
Handle to GNS service.
Definition: gnunet-gns.c:54
void GNUNET_GNS_disconnect(struct GNUNET_GNS_Handle *handle)
Shutdown connection with the GNS service.
Definition: gns_api.c:290
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_mandatory(struct GNUNET_GETOPT_CommandLineOption opt)
Make the given option mandatory.
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
static struct GNUNET_SCHEDULER_Task * to_task
Timeout task.
Definition: gnunet-gns.c:94
int GNUNET_CLIENT_test(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *service_name)
Test if the port or UNIXPATH of the given service_name is in use and thus (most likely) the respectiv...
Definition: client.c:892
static void do_shutdown(void *cls)
Task run on shutdown.
Definition: gnunet-gns.c:117
static void do_timeout(void *cls)
Task to run on timeout.
Definition: gnunet-gns.c:149
int GNUNET_DNSPARSER_check_name(const char *name)
Check if a hostname in UTF-8 format can be coded into valid IDNA.
Definition: dnsparser.c:79
static char * lookup_name
GNS name to lookup.
Definition: gnunet-gns.c:59
char * idna_name
DNS IDNA name to lookup.
Definition: gnunet-gns.c:64
static void process_lookup_result(void *cls, int was_gns, uint32_t rd_count, const struct GNUNET_GNSRECORD_Data *rd)
Function called with the result of a GNS lookup.
Definition: gnunet-gns.c:166
configuration data
Definition: configuration.c:84
const char * name
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_option_flag(char shortName, const char *name, const char *description, int *val)
Allow user to specify a flag (which internally means setting an integer to 1/GNUNET_YES/GNUNET_OK.
#define GNUNET_log(kind,...)
Entry in list of pending tasks.
Definition: scheduler.c:134
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:367
#define GNUNET_YES
Definition: gnunet_common.h:85
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-gns.c:49
Defaults, look in cache, then in DHT.
int GNUNET_log_setup(const char *comp, const char *loglevel, const char *logfile)
Setup logging.
Handle to a lookup request.
Definition: gns_tld_api.c:44
uint32_t data
The data value.
char * GNUNET_GNSRECORD_value_to_string(uint32_t type, const void *data, size_t data_size)
Convert the &#39;value&#39; of a record to a string.
Definition: gnsrecord.c:143
const char * GNUNET_GNSRECORD_number_to_typename(uint32_t type)
Convert a type number (i.e.
Definition: gnsrecord.c:231
static uint32_t rtype
Desired record type.
Definition: gnunet-gns.c:84
#define GNUNET_DNSPARSER_TYPE_A
#define GNUNET_free(ptr)
Wrapper around free.
static char * lookup_type
record type to look up (-t option)
Definition: gnunet-gns.c:74
Time for relative time used by GNUnet, in microseconds.
#define gettext_noop(String)
Definition: gettext.h:69
static int global_ret
Global return value.
Definition: gnunet-gns.c:108
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966