git.meshlink.io Git - catta/blob - avahi-core/resolve-service.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 <string.h>
  27 #include <stdio.h>
  28
  29 #include <avahi-common/domain.h>
  30 #include <avahi-common/timeval.h>
  31 #include <avahi-common/malloc.h>
  32 #include <avahi-common/error.h>
  33
  34 #include "browse.h"
  35
  36 struct AvahiSServiceResolver {
  37     AvahiServer *server;
  38     char *service_name;
  39     char *service_type;
  40     char *domain_name;
  41     AvahiProtocol address_protocol;
  42
  43     AvahiIfIndex interface;
  44     AvahiProtocol protocol;
  45
  46     AvahiSRecordBrowser *record_browser_srv;
  47     AvahiSRecordBrowser *record_browser_txt;
  48     AvahiSRecordBrowser *record_browser_a;
  49     AvahiSRecordBrowser *record_browser_aaaa;
  50
  51     AvahiRecord *srv_record, *txt_record, *address_record;
  52
  53     AvahiSServiceResolverCallback callback;
  54     void* userdata;
  55
  56     AvahiTimeEvent *time_event;
  57
  58     AVAHI_LLIST_FIELDS(AvahiSServiceResolver, resolver);
  59 };
  60
  61 static void finish(AvahiSServiceResolver *r, AvahiResolverEvent event) {
  62     assert(r);
  63
  64     if (r->record_browser_a) {
  65         avahi_s_record_browser_free(r->record_browser_a);
  66         r->record_browser_a = NULL;
  67     }
  68
  69     if (r->record_browser_aaaa) {
  70         avahi_s_record_browser_free(r->record_browser_aaaa);
  71         r->record_browser_aaaa = NULL;
  72     }
  73
  74     if (r->record_browser_srv) {
  75         avahi_s_record_browser_free(r->record_browser_srv);
  76         r->record_browser_srv = NULL;
  77     }
  78
  79     if (r->record_browser_txt) {
  80         avahi_s_record_browser_free(r->record_browser_txt);
  81         r->record_browser_txt = NULL;
  82     }
  83
  84     if (r->time_event) {
  85         avahi_time_event_free(r->time_event);
  86         r->time_event = NULL;
  87     }
  88
  89     if (event == AVAHI_RESOLVER_TIMEOUT)
  90         r->callback(r, r->interface, r->protocol, event, r->service_name, r->service_type, r->domain_name, NULL, NULL, 0, NULL, r->userdata);
  91     else {
  92         AvahiAddress a;
  93         char sn[256], st[256];
  94         size_t i;
  95
  96         assert(r->srv_record);
  97         assert(r->txt_record);
  98         assert(r->address_record);
  99
 100         switch (r->address_record->key->type) {
 101             case AVAHI_DNS_TYPE_A:
 102                 a.family = AVAHI_PROTO_INET;
 103                 a.data.ipv4 = r->address_record->data.a.address;
 104                 break;
 105
 106             case AVAHI_DNS_TYPE_AAAA:
 107                 a.family = AVAHI_PROTO_INET6;
 108                 a.data.ipv6 = r->address_record->data.aaaa.address;
 109                 break;
 110
 111             default:
 112                 assert(0);
 113         }
 114
 115         snprintf(sn, sizeof(sn), r->service_name);
 116         snprintf(st, sizeof(st), r->service_type);
 117
 118         if ((i = strlen(sn)) > 0 && sn[i-1] == '.')
 119             sn[i-1] = 0;
 120
 121         if ((i = strlen(st)) > 0 && st[i-1] == '.')
 122             st[i-1] = 0;
 123
 124         r->callback(r, r->interface, r->protocol, event, sn, st, r->domain_name, r->srv_record->data.srv.name, &a, r->srv_record->data.srv.port, r->txt_record->data.txt.string_list, r->userdata);
 125     }
 126 }
 127
 128 static void record_browser_callback(AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
 129     AvahiSServiceResolver *r = userdata;
 130
 131     assert(rr);
 132     assert(record);
 133     assert(r);
 134
 135     if (!(event == AVAHI_BROWSER_NEW))
 136         return;
 137
 138     if (r->interface > 0 && interface != r->interface)
 139         return;
 140
 141     if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
 142         return;
 143
 144     if (r->interface <= 0)
 145         r->interface = interface;
 146
 147     if (r->protocol == AVAHI_PROTO_UNSPEC)
 148         r->protocol = protocol;
 149
 150     switch (record->key->type) {
 151         case AVAHI_DNS_TYPE_SRV:
 152             if (!r->srv_record) {
 153                 r->srv_record = avahi_record_ref(record);
 154
 155                 assert(!r->record_browser_a && !r->record_browser_aaaa);
 156
 157                 if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) {
 158                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 159                     r->record_browser_a = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 160                     avahi_key_unref(k);
 161                 }
 162
 163                 if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) {
 164                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 165                     r->record_browser_aaaa = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 166                     avahi_key_unref(k);
 167                 }
 168             }
 169             break;
 170
 171         case AVAHI_DNS_TYPE_TXT:
 172             if (!r->txt_record)
 173                 r->txt_record = avahi_record_ref(record);
 174             break;
 175
 176         case AVAHI_DNS_TYPE_A:
 177         case AVAHI_DNS_TYPE_AAAA:
 178             if (!r->address_record)
 179                 r->address_record = avahi_record_ref(record);
 180             break;
 181
 182         default:
 183             assert(0);
 184     }
 185
 186     if (r->txt_record && r->srv_record && r->address_record)
 187         finish(r, AVAHI_RESOLVER_FOUND);
 188 }
 189
 190 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 191     AvahiSServiceResolver *r = userdata;
 192
 193     assert(e);
 194     assert(r);
 195
 196     finish(r, AVAHI_RESOLVER_TIMEOUT);
 197 }
 198
 199 AvahiSServiceResolver *avahi_s_service_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiProtocol aprotocol, AvahiSServiceResolverCallback callback, void* userdata) {
 200     AvahiSServiceResolver *r;
 201     AvahiKey *k;
 202     struct timeval tv;
 203     char t[256], *n;
 204     size_t l;
 205
 206     assert(server);
 207     assert(name);
 208     assert(type);
 209     assert(callback);
 210
 211     assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
 212
 213     if (!avahi_is_valid_service_name(name)) {
 214         avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_NAME);
 215         return NULL;
 216     }
 217
 218     if (!avahi_is_valid_service_type(type)) {
 219         avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_TYPE);
 220         return NULL;
 221     }
 222
 223     if (!avahi_is_valid_domain_name(domain)) {
 224         avahi_server_set_errno(server, AVAHI_ERR_INVALID_DOMAIN_NAME);
 225         return NULL;
 226     }
 227
 228     if (!(r = avahi_new(AvahiSServiceResolver, 1))) {
 229         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 230         return NULL;
 231     }
 232
 233     r->server = server;
 234     r->service_name = avahi_strdup(name);
 235     r->service_type = avahi_normalize_name(type);
 236     r->domain_name = avahi_normalize_name(domain);
 237     r->callback = callback;
 238     r->userdata = userdata;
 239     r->address_protocol = aprotocol;
 240     r->srv_record = r->txt_record = r->address_record = NULL;
 241     r->interface = interface;
 242     r->protocol = protocol;
 243
 244     n = t;
 245     l = sizeof(t);
 246     avahi_escape_label((const uint8_t*) name, strlen(name), &n, &l);
 247     snprintf(n, l, ".%s.%s", r->service_type, r->domain_name);
 248
 249     avahi_elapse_time(&tv, 1000, 0);
 250     r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r);
 251
 252     AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r);
 253
 254     r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
 255
 256     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
 257     r->record_browser_srv = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 258     avahi_key_unref(k);
 259
 260     if (!r->record_browser_srv) {
 261         avahi_s_service_resolver_free(r);
 262         return NULL;
 263     }
 264
 265     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
 266     r->record_browser_txt = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 267     avahi_key_unref(k);
 268
 269     if (!r->record_browser_txt) {
 270         avahi_s_service_resolver_free(r);
 271         return NULL;
 272     }
 273
 274     return r;
 275 }
 276
 277 void avahi_s_service_resolver_free(AvahiSServiceResolver *r) {
 278     assert(r);
 279
 280     AVAHI_LLIST_REMOVE(AvahiSServiceResolver, resolver, r->server->service_resolvers, r);
 281
 282     if (r->time_event)
 283         avahi_time_event_free(r->time_event);
 284
 285     if (r->record_browser_srv)
 286         avahi_s_record_browser_free(r->record_browser_srv);
 287     if (r->record_browser_txt)
 288         avahi_s_record_browser_free(r->record_browser_txt);
 289     if (r->record_browser_a)
 290         avahi_s_record_browser_free(r->record_browser_a);
 291     if (r->record_browser_aaaa)
 292         avahi_s_record_browser_free(r->record_browser_aaaa);
 293
 294     if (r->srv_record)
 295         avahi_record_unref(r->srv_record);
 296     if (r->txt_record)
 297         avahi_record_unref(r->txt_record);
 298     if (r->address_record)
 299         avahi_record_unref(r->address_record);
 300
 301     avahi_free(r->service_name);
 302     avahi_free(r->service_type);
 303     avahi_free(r->domain_name);
 304     avahi_free(r);
 305 }