src/util/test_resolver_api.c

   1 /*
   2    This file is part of GNUnet.
   3    Copyright (C) 2009 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  */
  20 /**
  21  * @file resolver/test_resolver_api.c
  22  * @brief testcase for resolver_api.c
  23  */
  24 #include "platform.h"
  25 #include "gnunet_util_lib.h"
  26 #include "gnunet_resolver_service.h"
  27 #include "resolver.h"
  28
  29
  30 static int disable_rootserver_check;
  31
  32
  33 /**
  34  * Using DNS root servers to check gnunet's resolver service
  35  * a.root-servers.net <-> 198.41.0.4 is a fix 1:1 mapping that should not change over years
  36  * For more information have a look at IANA's website http://www.root-servers.org/
  37  */
  38 #define ROOTSERVER_NAME "a.root-servers.net"
  39 #define ROOTSERVER_IP   "198.41.0.4"
  40
  41
  42 static void
  43 check_hostname(void *cls,
  44                const struct sockaddr *sa,
  45                socklen_t salen)
  46 {
  47   int *ok = cls;
  48
  49   if (0 == salen)
  50     {
  51       (*ok) &= ~8;
  52       return;
  53     }
  54   GNUNET_log(GNUNET_ERROR_TYPE_INFO,
  55              "Got IP address `%s' for our host.\n",
  56              GNUNET_a2s(sa, salen));
  57 }
  58
  59
  60 static void
  61 check_localhost_num(void *cls,
  62                     const char *hostname)
  63 {
  64   int *ok = cls;
  65
  66   if (hostname == NULL)
  67     return;
  68   if (0 == strcmp(hostname, "127.0.0.1"))
  69     {
  70       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
  71                  "Received correct hostname `%s'.\n",
  72                  hostname);
  73       (*ok) &= ~4;
  74     }
  75   else
  76     {
  77       GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
  78                  "Received invalid hostname `%s'.\n",
  79                  hostname);
  80       GNUNET_break(0);
  81     }
  82 }
  83
  84
  85 static void
  86 check_localhost(void *cls,
  87                 const char *hostname)
  88 {
  89   int *ok = cls;
  90
  91   if (NULL == hostname)
  92     return;
  93   if (0 == strcmp(hostname, "localhost"))
  94     {
  95       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
  96                  "Received correct hostname `%s'.\n",
  97                  hostname);
  98       (*ok) &= ~2;
  99     }
 100   else
 101     {
 102       GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
 103                  "Received unexpected hostname `%s', expected `localhost' (this could be OK).\n",
 104                  hostname);
 105     }
 106 }
 107
 108
 109 static void
 110 check_127(void *cls, const struct sockaddr *sa, socklen_t salen)
 111 {
 112   int *ok = cls;
 113   const struct sockaddr_in *sai = (const struct sockaddr_in *)sa;
 114
 115   if (NULL == sa)
 116     return;
 117   GNUNET_assert(sizeof(struct sockaddr_in) == salen);
 118   if (sai->sin_addr.s_addr == htonl(INADDR_LOOPBACK))
 119     {
 120       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 121                  "Received correct address.\n");
 122       (*ok) &= ~1;
 123     }
 124   else
 125     {
 126       char buf[INET_ADDRSTRLEN];
 127
 128       GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 129                  "Received incorrect address `%s'.\n",
 130                  inet_ntop(AF_INET,
 131                            &sai->sin_addr,
 132                            buf,
 133                            sizeof(buf)));
 134       GNUNET_break(0);
 135     }
 136 }
 137
 138
 139 static void
 140 check_rootserver_ip(void *cls, const struct sockaddr *sa, socklen_t salen)
 141 {
 142   int *ok = cls;
 143   const struct sockaddr_in *sai = (const struct sockaddr_in *)sa;
 144
 145   if (NULL == sa)
 146     return;
 147   GNUNET_assert(sizeof(struct sockaddr_in) == salen);
 148
 149   if (0 == strcmp(inet_ntoa(sai->sin_addr), ROOTSERVER_IP))
 150     {
 151       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 152                  "Received correct rootserver ip address.\n");
 153       (*ok) &= ~1;
 154     }
 155   else
 156     {
 157       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 158                  "Received incorrect rootserver ip address.\n");
 159       GNUNET_break(0);
 160     }
 161 }
 162
 163
 164 static void
 165 check_rootserver_name(void *cls,
 166                       const char *hostname)
 167 {
 168   int *ok = cls;
 169
 170   if (NULL == hostname)
 171     return;
 172
 173   if (0 == strcmp(hostname, ROOTSERVER_NAME))
 174     {
 175       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 176                  "Received correct rootserver hostname `%s'.\n",
 177                  hostname);
 178       (*ok) &= ~2;
 179     }
 180   else
 181     {
 182       GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
 183                  "Received invalid rootserver hostname `%s', expected `%s'\n",
 184                  hostname,
 185                  ROOTSERVER_NAME);
 186       GNUNET_break(disable_rootserver_check);
 187     }
 188 }
 189
 190
 191 static void
 192 run(void *cls, char *const *args, const char *cfgfile,
 193     const struct GNUNET_CONFIGURATION_Handle *cfg)
 194 {
 195   int *ok = cls;
 196   struct sockaddr_in sa;
 197   struct GNUNET_TIME_Relative timeout =
 198     GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 30);
 199   int count_ips = 0;
 200   char *own_fqdn;
 201   const char *rootserver_name = ROOTSERVER_NAME;
 202   struct hostent *rootserver;
 203   struct in_addr rootserver_addr;
 204
 205   memset(&sa, 0, sizeof(sa));
 206   sa.sin_family = AF_INET;
 207 #if HAVE_SOCKADDR_IN_SIN_LEN
 208   sa.sin_len = (u_char)sizeof(sa);
 209 #endif
 210   sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 211
 212   /*
 213    * Looking up our own fqdn
 214    */
 215   own_fqdn = GNUNET_RESOLVER_local_fqdn_get();
 216   /* can't really check, only thing we can safely
 217      compare against is our own identical logic... */
 218   GNUNET_free_non_null(own_fqdn);
 219
 220   /*
 221    * Testing non-local DNS resolution
 222    * DNS rootserver to test: a.root-servers.net - 198.41.0.4
 223    */
 224
 225   rootserver = gethostbyname(rootserver_name);
 226   if (NULL == rootserver)
 227     {
 228       /* Error: resolving ip addresses does not work */
 229       GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 230                  _("gethostbyname() could not lookup IP address: %s\n"),
 231                  hstrerror(h_errno));
 232       fprintf(stderr,
 233               "%s",
 234               "System seems to be off-line, will not run all DNS tests\n");
 235       *ok = 0;                  /* mark test as passing anyway */
 236       return;
 237     }
 238
 239   /* Counting returned IP addresses */
 240   while (NULL != rootserver->h_addr_list[count_ips])
 241     count_ips++;
 242   if (count_ips > 1)
 243     {
 244       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 245                  "IP received range for root name server, but a root name server has only 1 IP\n");
 246       GNUNET_break(0);
 247     }
 248
 249   /* Comparing to resolved address to the address the root name server should have */
 250   if (0 !=
 251       strcmp(inet_ntoa(*(struct in_addr *)rootserver->h_addr_list[0]),
 252              ROOTSERVER_IP))
 253     {
 254       GNUNET_log(GNUNET_ERROR_TYPE_ERROR,
 255                  "IP received and IP for root name server differ\n");
 256       GNUNET_break(0);
 257     }
 258   GNUNET_log(GNUNET_ERROR_TYPE_INFO,
 259              "System's own forward name resolution is working\n");
 260   /* Resolve the same using GNUNET */
 261   GNUNET_RESOLVER_ip_get(ROOTSERVER_NAME, AF_INET, timeout,
 262                          &check_rootserver_ip, cls);
 263   GNUNET_RESOLVER_ip_get(ROOTSERVER_NAME, AF_INET, timeout,
 264                          &check_rootserver_ip, cls);
 265
 266   /*
 267    * Success: forward lookups work as expected
 268    * Next step: reverse lookups
 269    */
 270   if (1 != inet_pton(AF_INET,
 271                      ROOTSERVER_IP,
 272                      &rootserver_addr))
 273     {
 274       GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
 275                  "Could not transform root name server IP address\n");
 276       GNUNET_break(0);
 277     }
 278
 279   rootserver =
 280     gethostbyaddr((const void *)&rootserver_addr,
 281                   sizeof(rootserver_addr),
 282                   AF_INET);
 283   if (NULL == rootserver)
 284     {
 285       /* Error: resolving IP addresses does not work */
 286       GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
 287                  "gethostbyaddr() could not lookup hostname: %s\n",
 288                  hstrerror(h_errno));
 289       disable_rootserver_check = GNUNET_YES;
 290     }
 291   else
 292     {
 293       if (0 != strcmp(rootserver->h_name,
 294                       ROOTSERVER_NAME))
 295         {
 296           GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
 297                      "Received hostname and hostname for root name server differ\n");
 298           disable_rootserver_check = GNUNET_YES;
 299         }
 300     }
 301
 302   GNUNET_log(GNUNET_ERROR_TYPE_INFO,
 303              "System's own reverse name resolution is working\n");
 304   /* Resolve the same using GNUNET */
 305   memset(&sa, 0, sizeof(sa));
 306   sa.sin_family = AF_INET;
 307 #if HAVE_SOCKADDR_IN_SIN_LEN
 308   sa.sin_len = (u_char)sizeof(sa);
 309 #endif
 310 #ifndef MINGW
 311   inet_aton(ROOTSERVER_IP, &sa.sin_addr);
 312 #else
 313   sa.sin_addr.S_un.S_addr = inet_addr(ROOTSERVER_IP);
 314 #endif
 315   GNUNET_RESOLVER_hostname_get((const struct sockaddr *)&sa,
 316                                sizeof(struct sockaddr), GNUNET_YES, timeout,
 317                                &check_rootserver_name, cls);
 318
 319   memset(&sa, 0, sizeof(sa));
 320   sa.sin_family = AF_INET;
 321 #if HAVE_SOCKADDR_IN_SIN_LEN
 322   sa.sin_len = (u_char)sizeof(sa);
 323 #endif
 324   sa.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
 325
 326   GNUNET_RESOLVER_ip_get("localhost", AF_INET, timeout, &check_127, cls);
 327   GNUNET_RESOLVER_hostname_get((const struct sockaddr *)&sa,
 328                                sizeof(struct sockaddr), GNUNET_YES, timeout,
 329                                &check_localhost, cls);
 330
 331   GNUNET_RESOLVER_hostname_get((const struct sockaddr *)&sa,
 332                                sizeof(struct sockaddr), GNUNET_NO, timeout,
 333                                &check_localhost_num, cls);
 334   GNUNET_RESOLVER_hostname_resolve(AF_UNSPEC, timeout, &check_hostname, cls);
 335 }
 336
 337
 338 int
 339 main(int argc, char *argv[])
 340 {
 341   int ok = 1 + 2 + 4 + 8;
 342   char *fn;
 343   struct GNUNET_OS_Process *proc;
 344   char *const argvx[] = {
 345     "test-resolver-api", "-c", "test_resolver_api_data.conf", NULL
 346   };
 347   struct GNUNET_GETOPT_CommandLineOption options[] =
 348   { GNUNET_GETOPT_OPTION_END };
 349
 350   GNUNET_log_setup("test-resolver-api",
 351                    "WARNING",
 352                    NULL);
 353   fn = GNUNET_OS_get_libexec_binary_path("gnunet-service-resolver");
 354   proc = GNUNET_OS_start_process(GNUNET_YES,
 355                                  GNUNET_OS_INHERIT_STD_OUT_AND_ERR,
 356                                  NULL, NULL, NULL,
 357                                  fn,
 358                                  "gnunet-service-resolver",
 359                                  "-c", "test_resolver_api_data.conf", NULL);
 360   GNUNET_assert(NULL != proc);
 361   GNUNET_free(fn);
 362   GNUNET_assert(GNUNET_OK ==
 363                 GNUNET_PROGRAM_run((sizeof(argvx) / sizeof(char *)) - 1,
 364                                    argvx, "test-resolver-api", "nohelp",
 365                                    options, &run, &ok));
 366   if (0 != GNUNET_OS_process_kill(proc, GNUNET_TERM_SIG))
 367     {
 368       GNUNET_log_strerror(GNUNET_ERROR_TYPE_WARNING, "kill");
 369       ok = 1;
 370     }
 371   GNUNET_OS_process_wait(proc);
 372   GNUNET_OS_process_destroy(proc);
 373   proc = NULL;
 374   if (0 != ok)
 375     fprintf(stderr, "Missed some resolutions: %u\n", ok);
 376   return ok;
 377 }
 378
 379
 380 /* end of test_resolver_api.c */