git.meshlink.io Git - catta/blob - avahi-utils/avahi-resolve.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of avahi.
   5
   6   avahi is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   avahi is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  14   Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with avahi; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <getopt.h>
  29 #include <assert.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <net/if.h>
  34 #include <locale.h>
  35
  36 #include <avahi-common/simple-watch.h>
  37 #include <avahi-common/error.h>
  38 #include <avahi-common/malloc.h>
  39 #include <avahi-common/domain.h>
  40 #include <avahi-common/llist.h>
  41 #include <avahi-client/client.h>
  42 #include <avahi-client/lookup.h>
  43
  44 #include "sigint.h"
  45
  46 #ifdef HAVE_GDBM
  47 #include "stdb.h"
  48 #endif
  49
  50 typedef enum {
  51     COMMAND_UNSPEC,
  52     COMMAND_HELP,
  53     COMMAND_VERSION,
  54     COMMAND_RESOLVE_HOST_NAME,
  55     COMMAND_RESOLVE_ADDRESS
  56 } Command;
  57
  58 typedef struct Config {
  59     int verbose;
  60     Command command;
  61     AvahiProtocol proto;
  62 } Config;
  63
  64 static AvahiSimplePoll *simple_poll = NULL;
  65 static AvahiClient *client = NULL;
  66
  67 static int n_resolving = 0;
  68
  69 static void host_name_resolver_callback(
  70     AvahiHostNameResolver *r,
  71     AVAHI_GCC_UNUSED AvahiIfIndex interface,
  72     AVAHI_GCC_UNUSED AvahiProtocol protocol,
  73     AvahiResolverEvent event,
  74     const char *name,
  75     const AvahiAddress *a,
  76     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
  77     AVAHI_GCC_UNUSED void *userdata) {
  78
  79     assert(r);
  80
  81     switch (event) {
  82         case AVAHI_RESOLVER_FOUND: {
  83             char address[AVAHI_ADDRESS_STR_MAX];
  84
  85             avahi_address_snprint(address, sizeof(address), a);
  86
  87             printf("%s\t%s\n", name, address);
  88
  89             break;
  90         }
  91
  92         case AVAHI_RESOLVER_FAILURE:
  93
  94             fprintf(stderr, "Failed to resolve host name '%s': %s\n", name, avahi_strerror(avahi_client_errno(client)));
  95             break;
  96     }
  97
  98
  99     avahi_host_name_resolver_free(r);
 100
 101     assert(n_resolving > 0);
 102     n_resolving--;
 103
 104     if (n_resolving <= 0)
 105         avahi_simple_poll_quit(simple_poll);
 106 }
 107
 108 static void address_resolver_callback(
 109     AvahiAddressResolver *r,
 110     AVAHI_GCC_UNUSED AvahiIfIndex interface,
 111     AVAHI_GCC_UNUSED AvahiProtocol protocol,
 112     AvahiResolverEvent event,
 113     const AvahiAddress *a,
 114     const char *name,
 115     AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
 116     AVAHI_GCC_UNUSED void *userdata) {
 117
 118     char address[AVAHI_ADDRESS_STR_MAX];
 119     assert(r);
 120
 121     avahi_address_snprint(address, sizeof(address), a);
 122
 123     switch (event) {
 124         case AVAHI_RESOLVER_FOUND:
 125
 126             printf("%s\t%s\n", address, name);
 127             break;
 128
 129         case AVAHI_RESOLVER_FAILURE:
 130
 131             fprintf(stderr, "Failed to resolve address '%s': %s\n", address, avahi_strerror(avahi_client_errno(client)));
 132             break;
 133     }
 134
 135
 136     avahi_address_resolver_free(r);
 137
 138     assert(n_resolving > 0);
 139     n_resolving--;
 140
 141     if (n_resolving <= 0)
 142         avahi_simple_poll_quit(simple_poll);
 143 }
 144
 145 static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) {
 146     switch (state) {
 147         case AVAHI_CLIENT_FAILURE:
 148             fprintf(stderr, "Client failure, exiting: %s\n", avahi_strerror(avahi_client_errno(c)));
 149             avahi_simple_poll_quit(simple_poll);
 150             break;
 151
 152         case AVAHI_CLIENT_S_REGISTERING:
 153         case AVAHI_CLIENT_S_RUNNING:
 154         case AVAHI_CLIENT_S_COLLISION:
 155         case AVAHI_CLIENT_CONNECTING:
 156             ;
 157     }
 158 }
 159
 160 static void help(FILE *f, const char *argv0) {
 161     fprintf(f,
 162             "%s [options] %s <host name ...>\n"
 163             "%s [options] %s <address ... >\n\n"
 164             "    -h --help            Show this help\n"
 165             "    -V --version         Show version\n"
 166             "    -n --name            Resolve host name\n"
 167             "    -a --address         Resolve address\n"
 168             "    -v --verbose         Enable verbose mode\n"
 169             "    -6                   Lookup IPv6 address\n"
 170             "    -4                   Lookup IPv4 address\n"
 171             ,
 172             argv0, strstr(argv0, "address") ? "[-a]" : "-a",
 173             argv0, strstr(argv0, "host-name") ? "[-n]" : "-n");
 174 }
 175
 176 static int parse_command_line(Config *c, const char *argv0, int argc, char *argv[]) {
 177     int o;
 178
 179     static const struct option long_options[] = {
 180         { "help",           no_argument,       NULL, 'h' },
 181         { "version",        no_argument,       NULL, 'V' },
 182         { "name",           no_argument,       NULL, 'n' },
 183         { "address",        no_argument,       NULL, 'a' },
 184         { "verbose",        no_argument,       NULL, 'v' },
 185         { NULL, 0, NULL, 0 }
 186     };
 187
 188     assert(c);
 189
 190     c->command = strstr(argv0, "address") ? COMMAND_RESOLVE_ADDRESS : (strstr(argv0, "host-name") ? COMMAND_RESOLVE_HOST_NAME : COMMAND_UNSPEC);
 191     c->proto = AVAHI_PROTO_UNSPEC;
 192     c->verbose = 0;
 193
 194     opterr = 0;
 195     while ((o = getopt_long(argc, argv, "hVnav46", long_options, NULL)) >= 0) {
 196
 197         switch(o) {
 198             case 'h':
 199                 c->command = COMMAND_HELP;
 200                 break;
 201             case 'V':
 202                 c->command = COMMAND_VERSION;
 203                 break;
 204             case 'n':
 205                 c->command = COMMAND_RESOLVE_HOST_NAME;
 206                 break;
 207             case 'a':
 208                 c->command = COMMAND_RESOLVE_ADDRESS;
 209                 break;
 210             case 'v':
 211                 c->verbose = 1;
 212                 break;
 213             case '4':
 214                 c->proto = AVAHI_PROTO_INET;
 215                 break;
 216             case '6':
 217                 c->proto = AVAHI_PROTO_INET6;
 218                 break;
 219             default:
 220                 fprintf(stderr, "Invalid command line argument: %c\n", o);
 221                 return -1;
 222         }
 223     }
 224
 225     if (c->command == COMMAND_RESOLVE_ADDRESS || c->command == COMMAND_RESOLVE_HOST_NAME) {
 226         if (optind >= argc) {
 227             fprintf(stderr, "Too few arguments\n");
 228             return -1;
 229         }
 230     }
 231
 232     return 0;
 233 }
 234
 235 int main(int argc, char *argv[]) {
 236     int ret = 1, error;
 237     Config config;
 238     const char *argv0;
 239
 240     if ((argv0 = strrchr(argv[0], '/')))
 241         argv0++;
 242     else
 243         argv0 = argv[0];
 244
 245     if (parse_command_line(&config, argv0, argc, argv) < 0)
 246         goto fail;
 247
 248     switch (config.command) {
 249         case COMMAND_UNSPEC:
 250             ret = 1;
 251             fprintf(stderr, "No command specified.\n");
 252             break;
 253
 254         case COMMAND_HELP:
 255             help(stdout, argv0);
 256             ret = 0;
 257             break;
 258
 259         case COMMAND_VERSION:
 260             printf("%s "PACKAGE_VERSION"\n", argv0);
 261             ret = 0;
 262             break;
 263
 264         case COMMAND_RESOLVE_HOST_NAME:
 265         case COMMAND_RESOLVE_ADDRESS: {
 266             int i;
 267
 268             if (!(simple_poll = avahi_simple_poll_new())) {
 269                 fprintf(stderr, "Failed to create simple poll object.\n");
 270                 goto fail;
 271             }
 272
 273             if (sigint_install(simple_poll) < 0)
 274                 goto fail;
 275
 276             if (!(client = avahi_client_new(avahi_simple_poll_get(simple_poll), 0, client_callback, NULL, &error))) {
 277                 fprintf(stderr, "Failed to create client object: %s\n", avahi_strerror(error));
 278                 goto fail;
 279             }
 280
 281             if (config.verbose) {
 282                 const char *version, *hn;
 283
 284                 if (!(version = avahi_client_get_version_string(client))) {
 285                     fprintf(stderr, "Failed to query version string: %s\n", avahi_strerror(avahi_client_errno(client)));
 286                     goto fail;
 287                 }
 288
 289                 if (!(hn = avahi_client_get_host_name_fqdn(client))) {
 290                     fprintf(stderr, "Failed to query host name: %s\n", avahi_strerror(avahi_client_errno(client)));
 291                     goto fail;
 292                 }
 293
 294                 fprintf(stderr, "Server version: %s; Host name: %s\n", version, hn);
 295             }
 296
 297             n_resolving = 0;
 298
 299             for (i = optind; i < argc; i++) {
 300
 301                 if (config.command == COMMAND_RESOLVE_HOST_NAME) {
 302
 303                     if (!(avahi_host_name_resolver_new(client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, argv[i], config.proto, 0, host_name_resolver_callback, NULL))) {
 304                         fprintf(stderr, "Failed to create host name resolver: %s\n", avahi_strerror(avahi_client_errno(client)));
 305                         goto fail;
 306                     }
 307
 308                 } else {
 309                     AvahiAddress a;
 310
 311                     assert(config.command == COMMAND_RESOLVE_ADDRESS);
 312
 313                     if (!avahi_address_parse(argv[i], AVAHI_PROTO_UNSPEC, &a)) {
 314                         fprintf(stderr, "Failed to parse address '%s'\n", argv[i]);
 315                         goto fail;
 316                     }
 317
 318                     if (!(avahi_address_resolver_new(client, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, &a, 0, address_resolver_callback, NULL))) {
 319                         fprintf(stderr, "Failed to create address resolver: %s\n", avahi_strerror(avahi_client_errno(client)));
 320                         goto fail;
 321                     }
 322                 }
 323
 324                 n_resolving++;
 325             }
 326
 327             avahi_simple_poll_loop(simple_poll);
 328             ret = 0;
 329             break;
 330         }
 331     }
 332
 333 fail:
 334
 335     if (client)
 336         avahi_client_free(client);
 337
 338     sigint_uninstall();
 339
 340     if (simple_poll)
 341         avahi_simple_poll_free(simple_poll);
 342
 343     return ret;
 344 }