summaryrefslogtreecommitdiff
path: root/src/gns/gnunet-gns.c
blob: 600a9c9a58233174171d8639c2e54d88eec874ca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
/*
     This file is part of GNUnet.
     Copyright (C) 2012-2013, 2017-2018 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */
/**
 * @file gnunet-gns.c
 * @brief command line tool to access distributed GNS
 * @author Christian Grothoff
 */
#include "platform.h"
#if HAVE_LIBIDN2
#if HAVE_IDN2_H
#include <idn2.h>
#elif HAVE_IDN2_IDN2_H
#include <idn2/idn2.h>
#endif
#elif HAVE_LIBIDN
#if HAVE_IDNA_H
#include <idna.h>
#elif HAVE_IDN_IDNA_H
#include <idn/idna.h>
#endif
#endif
#include <gnunet_util_lib.h>
#include <gnunet_dnsparser_lib.h>
#include <gnunet_gnsrecord_lib.h>
#include <gnunet_namestore_service.h>
#include <gnunet_gns_service.h>


/**
 * Configuration we are using.
 */
static const struct GNUNET_CONFIGURATION_Handle *cfg;

/**
 * Handle to GNS service.
 */
static struct GNUNET_GNS_Handle *gns;

/**
 * GNS name to lookup. (-u option)
 */
static char *lookup_name;

/**
 * DNS IDNA name to lookup. (set if -d option is set)
 */
char *idna_name;

/**
 * DNS compatibility (name is given as DNS name, possible IDNA).
 */
static int dns_compat;

/**
 * record type to look up (-t option)
 */
static char *lookup_type;

/**
 * raw output
 */
static int raw;

/**
 * Desired record type.
 */
static uint32_t rtype;

/**
 * Timeout for lookup
 */
static struct GNUNET_TIME_Relative timeout;

/**
 * Timeout task
 */
static struct GNUNET_SCHEDULER_Task *to_task;

/**
 * Handle to lookup request
 */
static struct GNUNET_GNS_LookupWithTldRequest *lr;

/**
 * Global return value.
 * 0 on success (default),
 * 1 on internal failures
 * 2 on launch failure,
 * 4 if the name is not a GNS-supported TLD,
 */
static int global_ret;


/**
 * Task run on shutdown.  Cleans up everything.
 *
 * @param cls unused
 */
static void
do_shutdown (void *cls)
{
  (void) cls;
  if (NULL != to_task)
  {
    GNUNET_SCHEDULER_cancel (to_task);
    to_task = NULL;
  }
  if (NULL != lr)
  {
    GNUNET_GNS_lookup_with_tld_cancel (lr);
    lr = NULL;
  }
  if (NULL != gns)
  {
    GNUNET_GNS_disconnect (gns);
    gns = NULL;
  }
  if (NULL != idna_name)
  {
    GNUNET_free (idna_name);
    idna_name = NULL;
  }
}


/**
 * Task to run on timeout
 *
 * @param cls unused
 */
static void
do_timeout (void*cls)
{
  to_task = NULL;
  global_ret = 3; // Timeout
  GNUNET_SCHEDULER_shutdown ();
}


/**
 * Function called with the result of a GNS lookup.
 *
 * @param cls the 'const char *' name that was resolved
 * @param was_gns #GNUNET_NO if TLD did not indicate use of GNS
 * @param rd_count number of records returned
 * @param rd array of @a rd_count records with the results
 */
static void
process_lookup_result (void *cls,
                       int was_gns,
                       uint32_t rd_count,
                       const struct GNUNET_GNSRECORD_Data *rd)
{
  const char *name = cls;
  const char *typename;
  char *string_val;

  lr = NULL;
  if (GNUNET_NO == was_gns)
  {
    global_ret = 4;   /* not for GNS */
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (! raw)
  {
    if (0 == rd_count)
      printf ("No results.\n");
    else
      printf ("%s:\n", name);
  }
  for (uint32_t i = 0; i < rd_count; i++)
  {
    if ((rd[i].record_type != rtype) && (GNUNET_GNSRECORD_TYPE_ANY != rtype))
      continue;
    typename = GNUNET_GNSRECORD_number_to_typename (rd[i].record_type);
    string_val = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
                                                   rd[i].data,
                                                   rd[i].data_size);
    if (NULL == string_val)
    {
      fprintf (stderr,
               "Record %u of type %d malformed, skipping\n",
               (unsigned int) i,
               (int) rd[i].record_type);
      continue;
    }
    if (raw)
      printf ("%s\n", string_val);
    else
      printf ("Got `%s' record: %s\n", typename, string_val);
    GNUNET_free (string_val);
  }
  GNUNET_SCHEDULER_shutdown ();
}


/**
 * Main function that will be run.
 *
 * @param cls closure
 * @param args remaining command-line arguments
 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 * @param c configuration
 */
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *c)
{
  (void) cls;
  (void) args;
  (void) cfgfile;

  cfg = c;
  to_task = NULL;
  {
    char *colon;

    if (NULL != (colon = strchr (lookup_name, ':')))
      *colon = '\0';
  }
#ifdef LSD001
  Idna_rc rc;
  /**
   * If DNS compatibility is requested, we first verify that the
   * lookup_name is in a DNS format. If yes, we convert it to UTF-8.
   */
  if (GNUNET_YES == dns_compat)
  {
#endif
    if (GNUNET_OK != GNUNET_DNSPARSER_check_name (lookup_name))
    {
      fprintf (stderr,
               _ ("`%s' is not a valid DNS domain name\n"),
               lookup_name);
      global_ret = 3;
      return;
    }
#ifdef LSD001
    if (IDNA_SUCCESS !=
        (rc = idna_to_unicode_8z8z (lookup_name, &idna_name,
                                    IDNA_ALLOW_UNASSIGNED)))
    {
      fprintf (stderr,
               _ ("Failed to convert DNS IDNA name `%s' to UTF-8: %s\n"),
               lookup_name,
               idna_strerror (rc));
      global_ret = 4;
      return;
    }
    lookup_name = idna_name;
  }
#endif
  if (GNUNET_YES !=
      GNUNET_CLIENT_test (cfg,
                          "arm"))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _ ("Cannot resolve using GNS: GNUnet peer not running\n"));
    global_ret = 2;
    return;
  }
  to_task = GNUNET_SCHEDULER_add_delayed (timeout,
                                          &do_timeout,
                                          NULL);
  gns = GNUNET_GNS_connect (cfg);
  if (NULL == gns)
  {
    fprintf (stderr,
             _ ("Failed to connect to GNS\n"));
    global_ret = 2;
    return;
  }
  GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
                                 NULL);
  if (NULL != lookup_type)
    rtype = GNUNET_GNSRECORD_typename_to_number (lookup_type);
  else
    rtype = GNUNET_DNSPARSER_TYPE_A;
  if (UINT32_MAX == rtype)
  {
    fprintf (stderr,
             _ ("Invalid typename specified, assuming `ANY'\n"));
    rtype = GNUNET_GNSRECORD_TYPE_ANY;
  }
  lr = GNUNET_GNS_lookup_with_tld (gns,
                                   lookup_name,
                                   rtype,
                                   GNUNET_GNS_LO_DEFAULT,
                                   &process_lookup_result,
                                   lookup_name);
  if (NULL == lr)
  {
    global_ret = 2;
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
}


/**
 * The main function for gnunet-gns.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc, char *const *argv)
{
  timeout = GNUNET_TIME_UNIT_FOREVER_REL;
  struct GNUNET_GETOPT_CommandLineOption options[] =
  { GNUNET_GETOPT_option_mandatory (
      GNUNET_GETOPT_option_string ('u',
                                   "lookup",
                                   "NAME",
                                   gettext_noop (
                                     "Lookup a record for the given name"),
                                   &lookup_name)),
    GNUNET_GETOPT_option_string ('t',
                                 "type",
                                 "TYPE",
                                 gettext_noop (
                                   "Specify the type of the record to lookup"),
                                 &lookup_type),
    GNUNET_GETOPT_option_relative_time ('T',
                                        "timeout",
                                        "TIMEOUT",
                                        gettext_noop (
                                          "Specify a timeout for the lookup"),
                                        &timeout),
    GNUNET_GETOPT_option_flag ('r',
                               "raw",
                               gettext_noop ("No unneeded output"),
                               &raw),
    GNUNET_GETOPT_option_flag ('d',
                               "dns",
                               gettext_noop (
                                 "DNS Compatibility: Name is passed in IDNA instead of UTF-8"),
                               &dns_compat),
    GNUNET_GETOPT_OPTION_END };
  int ret;

  if (GNUNET_OK !=
      GNUNET_STRINGS_get_utf8_args (argc, argv,
                                    &argc, &argv))
    return 2;

  GNUNET_log_setup ("gnunet-gns", "WARNING", NULL);
  ret = GNUNET_PROGRAM_run (argc,
                            argv,
                            "gnunet-gns",
                            _ ("GNUnet GNS resolver tool"),
                            options,
                            &run,
                            NULL);
  GNUNET_free ((void *) argv);
  if (GNUNET_OK != ret)
    return 1;
  return global_ret;
}


/* end of gnunet-gns.c */