git.meshlink.io Git - catta/blob - avahi-core/server.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 <sys/socket.h>
  27 #include <arpa/inet.h>
  28 #include <string.h>
  29 #include <sys/utsname.h>
  30 #include <unistd.h>
  31
  32 #include "server.h"
  33 #include "util.h"
  34 #include "iface.h"
  35 #include "socket.h"
  36 #include "resolve.h"
  37
  38 #define AVAHI_HOST_RR_HOLDOFF_MSEC 1000
  39
  40 static void free_entry(AvahiServer*s, AvahiEntry *e) {
  41     AvahiEntry *t;
  42
  43     g_assert(s);
  44     g_assert(e);
  45
  46     avahi_goodbye_entry(s, e, TRUE);
  47
  48     /* Remove from linked list */
  49     AVAHI_LLIST_REMOVE(AvahiEntry, entries, s->entries, e);
  50
  51     /* Remove from hash table indexed by name */
  52     t = g_hash_table_lookup(s->entries_by_key, e->record->key);
  53     AVAHI_LLIST_REMOVE(AvahiEntry, by_key, t, e);
  54     if (t)
  55         g_hash_table_replace(s->entries_by_key, t->record->key, t);
  56     else
  57         g_hash_table_remove(s->entries_by_key, e->record->key);
  58
  59     /* Remove from associated group */
  60     if (e->group)
  61         AVAHI_LLIST_REMOVE(AvahiEntry, by_group, e->group->entries, e);
  62
  63     avahi_record_unref(e->record);
  64     g_free(e);
  65 }
  66
  67 static void free_group(AvahiServer *s, AvahiEntryGroup *g) {
  68     g_assert(s);
  69     g_assert(g);
  70
  71     while (g->entries)
  72         free_entry(s, g->entries);
  73
  74     AVAHI_LLIST_REMOVE(AvahiEntryGroup, groups, s->groups, g);
  75     g_free(g);
  76 }
  77
  78 static void cleanup_dead(AvahiServer *s) {
  79     AvahiEntryGroup *g, *ng;
  80     AvahiEntry *e, *ne;
  81     g_assert(s);
  82
  83
  84     if (s->need_group_cleanup) {
  85         for (g = s->groups; g; g = ng) {
  86             ng = g->groups_next;
  87
  88             if (g->dead)
  89                 free_group(s, g);
  90         }
  91
  92         s->need_group_cleanup = FALSE;
  93     }
  94
  95     if (s->need_entry_cleanup) {
  96         for (e = s->entries; e; e = ne) {
  97             ne = e->entries_next;
  98
  99             if (e->dead)
 100                 free_entry(s, e);
 101         }
 102
 103         s->need_entry_cleanup = FALSE;
 104     }
 105 }
 106
 107 static void enum_aux_records(AvahiServer *s, AvahiInterface *i, const gchar *name, guint16 type, void (*callback)(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata), gpointer userdata) {
 108     AvahiKey *k;
 109     AvahiEntry *e;
 110
 111     g_assert(s);
 112     g_assert(i);
 113     g_assert(name);
 114     g_assert(callback);
 115
 116     g_assert(type != AVAHI_DNS_TYPE_ANY);
 117
 118     k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type);
 119
 120     for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
 121         if (!e->dead && avahi_entry_registered(s, e, i))
 122             callback(s, e->record, e->flags & AVAHI_ENTRY_UNIQUE, userdata);
 123
 124     avahi_key_unref(k);
 125 }
 126
 127 void avahi_server_enumerate_aux_records(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, void (*callback)(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata), gpointer userdata) {
 128     g_assert(s);
 129     g_assert(i);
 130     g_assert(r);
 131     g_assert(callback);
 132
 133     if (r->key->class == AVAHI_DNS_CLASS_IN) {
 134         if (r->key->type == AVAHI_DNS_TYPE_PTR) {
 135             enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
 136             enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
 137         } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
 138             enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
 139             enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
 140         }
 141     }
 142 }
 143
 144 void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, gboolean unicast_response, gboolean auxiliary) {
 145     g_assert(s);
 146     g_assert(i);
 147     g_assert(e);
 148
 149     avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_ENTRY_UNIQUE, unicast_response, auxiliary);
 150 }
 151
 152 void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, gboolean unicast_response) {
 153     AvahiEntry *e;
 154 /*     gchar *txt; */
 155
 156     g_assert(s);
 157     g_assert(i);
 158     g_assert(k);
 159
 160 /*     g_message("Posting responses matching [%s]", txt = avahi_key_to_string(k)); */
 161 /*     g_free(txt); */
 162
 163     if (avahi_key_is_pattern(k)) {
 164
 165         /* Handle ANY query */
 166
 167         for (e = s->entries; e; e = e->entries_next)
 168             if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_registered(s, e, i))
 169                 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
 170
 171     } else {
 172
 173         /* Handle all other queries */
 174
 175         for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
 176             if (!e->dead && avahi_entry_registered(s, e, i))
 177                 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
 178     }
 179 }
 180
 181 static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
 182     g_assert(s);
 183     g_assert(e);
 184
 185     if (e->group) {
 186         AvahiEntry *k;
 187
 188         for (k = e->group->entries; k; k = k->by_group_next) {
 189             avahi_goodbye_entry(s, k, FALSE);
 190             k->dead = TRUE;
 191         }
 192
 193         avahi_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
 194     } else {
 195         avahi_goodbye_entry(s, e, FALSE);
 196         e->dead = TRUE;
 197     }
 198
 199     s->need_entry_cleanup = TRUE;
 200 }
 201
 202 static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
 203     AvahiEntry *e;
 204
 205     g_assert(s);
 206     g_assert(key);
 207
 208    for (e = g_hash_table_lookup(s->entries_by_key, key); e; e = e->by_key_next)
 209         withdraw_entry(s, e);
 210 }
 211
 212 static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
 213     AvahiEntry *e, *n;
 214     gchar *t;
 215     gboolean ours = FALSE, won = FALSE, lost = FALSE;
 216
 217     g_assert(s);
 218     g_assert(record);
 219     g_assert(i);
 220
 221     for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
 222         gint cmp;
 223         n = e->by_key_next;
 224
 225         if (e->dead || !avahi_entry_probing(s, e, i))
 226             continue;
 227
 228         if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
 229             ours = TRUE;
 230             break;
 231         } else if (cmp > 0)
 232             won = TRUE;
 233         else /* cmp < 0 */
 234             lost = TRUE;
 235     }
 236
 237     t = avahi_record_to_string(record);
 238
 239     if (!ours) {
 240
 241         if (won)
 242             g_message("Recieved conflicting probe [%s]. Local host won.", t);
 243         else if (lost) {
 244             g_message("Recieved conflicting probe [%s]. Local host lost. Withdrawing.", t);
 245             withdraw_rrset(s, record->key);
 246         }
 247     }
 248
 249     g_free(t);
 250 }
 251
 252 static gboolean handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, gboolean unique, const AvahiAddress *a) {
 253     gboolean valid = TRUE, ours = FALSE, conflict = FALSE, withdraw_immediately = FALSE;
 254     AvahiEntry *e, *n, *conflicting_entry = NULL;
 255     gchar *t;
 256
 257     g_assert(s);
 258     g_assert(i);
 259     g_assert(record);
 260
 261     t = avahi_record_to_string(record);
 262
 263 /*     g_message("CHECKING FOR CONFLICT: [%s]", t);   */
 264
 265     for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
 266         n = e->by_key_next;
 267
 268         if (e->dead || (!(e->flags & AVAHI_ENTRY_UNIQUE) && !unique))
 269             continue;
 270
 271         /* Either our entry or the other is intended to be unique, so let's check */
 272
 273         if (avahi_entry_registered(s, e, i)) {
 274
 275             if (avahi_record_equal_no_ttl(e->record, record)) {
 276                 ours = TRUE; /* We have an identical record, so this is no conflict */
 277
 278                 /* Check wheter there is a TTL conflict */
 279                 if (record->ttl <= e->record->ttl/2) {
 280                     /* Refresh */
 281                     g_message("Recieved record with bad TTL [%s]. Refreshing.", t);
 282                     avahi_interface_post_response(i, e->record, FALSE, NULL, TRUE);
 283                     valid = FALSE;
 284                 }
 285
 286                 /* There's no need to check the other entries of this RRset */
 287                 break;
 288             } else {
 289                 /* A conflict => we have to return to probe mode */
 290                 conflict = TRUE;
 291                 conflicting_entry = e;
 292             }
 293
 294         } else if (avahi_entry_probing(s, e, i)) {
 295
 296             if (!avahi_record_equal_no_ttl(record, e->record)) {
 297
 298                 /* We are currently registering a matching record, but
 299                  * someone else already claimed it, so let's
 300                  * withdraw */
 301                 conflict = TRUE;
 302                 withdraw_immediately = TRUE;
 303             }
 304         }
 305     }
 306
 307 /*     g_message("ours=%i conflict=%i", ours, conflict); */
 308
 309     if (!ours && conflict) {
 310         valid = FALSE;
 311
 312         if (withdraw_immediately) {
 313             g_message("Recieved conflicting record [%s] with local record to be. Withdrawing.", t);
 314             withdraw_rrset(s, record->key);
 315         } else {
 316             g_assert(conflicting_entry);
 317             g_message("Recieved conflicting record [%s]. Resetting our record.", t);
 318             avahi_entry_return_to_initial_state(s, conflicting_entry, i);
 319
 320             /* Local unique records are returned to probin
 321              * state. Local shared records are reannounced. */
 322         }
 323     }
 324
 325     g_free(t);
 326
 327     return valid;
 328 }
 329
 330 static void append_aux_callback(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata) {
 331     gboolean *unicast_response = userdata;
 332
 333     g_assert(s);
 334     g_assert(r);
 335     g_assert(unicast_response);
 336
 337     avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, TRUE);
 338 }
 339
 340 static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, gboolean unicast_response) {
 341     g_assert(s);
 342     g_assert(r);
 343
 344     avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
 345 }
 346
 347 void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
 348
 349     g_assert(s);
 350     g_assert(i);
 351     g_assert(!legacy_unicast || (a && port > 0 && p));
 352
 353     if (legacy_unicast) {
 354         AvahiDnsPacket *reply;
 355         AvahiRecord *r;
 356
 357         reply = avahi_dns_packet_new_reply(p, 512 /* unicast DNS maximum packet size is 512 */ , TRUE, TRUE);
 358
 359         while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
 360
 361             append_aux_records_to_list(s, i, r, FALSE);
 362
 363             if (avahi_dns_packet_append_record(reply, r, FALSE, 10))
 364                 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
 365             else {
 366                 gchar *t = avahi_record_to_string(r);
 367                 g_warning("Record [%s] not fitting in legacy unicast packet, dropping.", t);
 368                 g_free(t);
 369             }
 370
 371             avahi_record_unref(r);
 372         }
 373
 374         if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
 375             avahi_interface_send_packet_unicast(i, reply, a, port);
 376
 377         avahi_dns_packet_free(reply);
 378
 379     } else {
 380         gboolean unicast_response, flush_cache, auxiliary;
 381         AvahiDnsPacket *reply = NULL;
 382         AvahiRecord *r;
 383
 384         /* In case the query packet was truncated never respond
 385         immediately, because known answer suppression records might be
 386         contained in later packets */
 387         gboolean tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
 388
 389         while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
 390
 391             if (!avahi_interface_post_response(i, r, flush_cache, a, !tc && flush_cache && !auxiliary) && unicast_response) {
 392
 393                 append_aux_records_to_list(s, i, r, unicast_response);
 394
 395                 /* Due to some reasons the record has not been scheduled.
 396                  * The client requested an unicast response in that
 397                  * case. Therefore we prepare such a response */
 398
 399                 for (;;) {
 400
 401                     if (!reply) {
 402                         g_assert(p);
 403                         reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, FALSE, FALSE);
 404                     }
 405
 406                     if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
 407
 408                         /* Appending this record succeeded, so incremeant
 409                          * the specific header field, and return to the caller */
 410
 411                         avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
 412
 413                         break;
 414                     }
 415
 416                     if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
 417                         guint size;
 418
 419                         /* The record is too large for one packet, so create a larger packet */
 420
 421                         avahi_dns_packet_free(reply);
 422                         size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
 423                         if (size > AVAHI_DNS_PACKET_MAX_SIZE)
 424                             size = AVAHI_DNS_PACKET_MAX_SIZE;
 425                         reply = avahi_dns_packet_new_reply(p, size, FALSE, TRUE);
 426
 427                         if (!avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
 428                             avahi_dns_packet_free(reply);
 429
 430                             gchar *t = avahi_record_to_string(r);
 431                             g_warning("Record [%s] too large, doesn't fit in any packet!", t);
 432                             g_free(t);
 433                             break;
 434                         } else
 435                             avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
 436                     }
 437
 438                     /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
 439                     avahi_interface_send_packet_unicast(i, reply, a, port);
 440                     avahi_dns_packet_free(reply);
 441                     reply = NULL;
 442                 }
 443             }
 444
 445             avahi_record_unref(r);
 446         }
 447
 448         if (reply) {
 449             if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
 450                 avahi_interface_send_packet_unicast(i, reply, a, port);
 451             avahi_dns_packet_free(reply);
 452         }
 453     }
 454
 455     avahi_record_list_flush(s->record_list);
 456 }
 457
 458 static void handle_query(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
 459     guint n;
 460
 461     g_assert(s);
 462     g_assert(p);
 463     g_assert(i);
 464     g_assert(a);
 465
 466 /*     g_message("query"); */
 467
 468     g_assert(avahi_record_list_empty(s->record_list));
 469
 470     /* Handle the questions */
 471     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
 472         AvahiKey *key;
 473         gboolean unicast_response = FALSE;
 474
 475         if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
 476             g_warning("Packet too short (1)");
 477             goto fail;
 478         }
 479
 480         avahi_query_scheduler_incoming(i->query_scheduler, key);
 481         avahi_server_prepare_matching_responses(s, i, key, unicast_response);
 482         avahi_key_unref(key);
 483     }
 484
 485     /* Known Answer Suppression */
 486     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
 487         AvahiRecord *record;
 488         gboolean unique = FALSE;
 489
 490         if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
 491             g_warning("Packet too short (2)");
 492             goto fail;
 493         }
 494
 495         if (handle_conflict(s, i, record, unique, a)) {
 496             avahi_response_scheduler_suppress(i->response_scheduler, record, a);
 497             avahi_record_list_drop(s->record_list, record);
 498         }
 499
 500         avahi_record_unref(record);
 501     }
 502
 503     /* Probe record */
 504     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
 505         AvahiRecord *record;
 506         gboolean unique = FALSE;
 507
 508         if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
 509             g_warning("Packet too short (3)");
 510             goto fail;
 511         }
 512
 513         if (record->key->type != AVAHI_DNS_TYPE_ANY)
 514             incoming_probe(s, record, i);
 515
 516         avahi_record_unref(record);
 517     }
 518
 519     if (!avahi_record_list_empty(s->record_list))
 520         avahi_server_generate_response(s, i, p, a, port, legacy_unicast);
 521
 522     return;
 523
 524 fail:
 525     avahi_record_list_flush(s->record_list);
 526
 527 }
 528
 529 static void handle_response(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a) {
 530     guint n;
 531
 532     g_assert(s);
 533     g_assert(p);
 534     g_assert(i);
 535     g_assert(a);
 536
 537 /*     g_message("response"); */
 538
 539     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
 540              avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
 541         AvahiRecord *record;
 542         gboolean cache_flush = FALSE;
 543 /*         gchar *txt; */
 544
 545         if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
 546             g_warning("Packet too short (4)");
 547             break;
 548         }
 549
 550         if (record->key->type != AVAHI_DNS_TYPE_ANY) {
 551
 552 /*             g_message("Handling response: %s", txt = avahi_record_to_string(record)); */
 553 /*             g_free(txt); */
 554
 555             if (handle_conflict(s, i, record, cache_flush, a)) {
 556                 avahi_cache_update(i->cache, record, cache_flush, a);
 557                 avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
 558             }
 559         }
 560
 561         avahi_record_unref(record);
 562     }
 563 }
 564
 565 static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
 566     AvahiInterface *i;
 567     AvahiAddress a;
 568     guint16 port;
 569
 570     g_assert(s);
 571     g_assert(p);
 572     g_assert(sa);
 573     g_assert(iface > 0);
 574
 575     if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, sa->sa_family)) ||
 576         !avahi_interface_relevant(i)) {
 577         g_warning("Recieved packet from invalid interface.");
 578         return;
 579     }
 580
 581 /*     g_message("new packet recieved on interface '%s.%i'.", i->hardware->name, i->protocol); */
 582
 583     if (sa->sa_family == AF_INET6) {
 584         static const guint8 ipv4_in_ipv6[] = {
 585             0x00, 0x00, 0x00, 0x00,
 586             0x00, 0x00, 0x00, 0x00,
 587             0xFF, 0xFF, 0xFF, 0xFF };
 588
 589         /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
 590
 591         if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0)
 592             return;
 593     }
 594
 595     if (avahi_dns_packet_check_valid(p) < 0) {
 596         g_warning("Recieved invalid packet.");
 597         return;
 598     }
 599
 600     port = avahi_port_from_sockaddr(sa);
 601     avahi_address_from_sockaddr(sa, &a);
 602
 603     if (avahi_dns_packet_is_query(p)) {
 604         gboolean legacy_unicast = FALSE;
 605
 606         if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT) != 0) {
 607             g_warning("Invalid query packet.");
 608             return;
 609         }
 610
 611         if (port != AVAHI_MDNS_PORT) {
 612             /* Legacy Unicast */
 613
 614             if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
 615                  avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
 616                 g_warning("Invalid legacy unicast query packet.");
 617                 return;
 618             }
 619
 620             legacy_unicast = TRUE;
 621         }
 622
 623         handle_query(s, p, i, &a, port, legacy_unicast);
 624
 625 /*         g_message("Handled query"); */
 626     } else {
 627
 628         if (port != AVAHI_MDNS_PORT) {
 629             g_warning("Recieved repsonse with invalid source port %u on interface '%s.%i'", port, i->hardware->name, i->protocol);
 630             return;
 631         }
 632
 633         if (ttl != 255) {
 634             g_warning("Recieved response with invalid TTL %u on interface '%s.%i'.", ttl, i->hardware->name, i->protocol);
 635             if (s->config.check_response_ttl)
 636                 return;
 637         }
 638
 639         if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
 640             avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
 641             avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
 642             g_warning("Invalid response packet.");
 643             return;
 644         }
 645
 646         handle_response(s, p, i, &a);
 647 /*         g_message("Handled response"); */
 648     }
 649 }
 650
 651 static void work(AvahiServer *s) {
 652     struct sockaddr_in6 sa6;
 653     struct sockaddr_in sa;
 654     AvahiDnsPacket *p;
 655     gint iface = 0;
 656     guint8 ttl;
 657
 658     g_assert(s);
 659
 660     if (s->pollfd_ipv4.revents & G_IO_IN) {
 661         if ((p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl))) {
 662             dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
 663             avahi_dns_packet_free(p);
 664         }
 665     }
 666
 667     if (s->pollfd_ipv6.revents & G_IO_IN) {
 668         if ((p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl))) {
 669             dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
 670             avahi_dns_packet_free(p);
 671         }
 672     }
 673 }
 674
 675 static gboolean prepare_func(GSource *source, gint *timeout) {
 676     g_assert(source);
 677     g_assert(timeout);
 678
 679     *timeout = -1;
 680     return FALSE;
 681 }
 682
 683 static gboolean check_func(GSource *source) {
 684     AvahiServer* s;
 685     g_assert(source);
 686
 687     s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
 688     g_assert(s);
 689
 690     return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
 691 }
 692
 693 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
 694     AvahiServer* s;
 695     g_assert(source);
 696
 697     s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
 698     g_assert(s);
 699
 700     work(s);
 701     cleanup_dead(s);
 702
 703     return TRUE;
 704 }
 705
 706 static void server_set_state(AvahiServer *s, AvahiServerState state) {
 707     g_assert(s);
 708
 709     if (s->state == state)
 710         return;
 711
 712     s->state = state;
 713
 714     if (s->callback)
 715         s->callback(s, state, s->userdata);
 716 }
 717
 718 static void withdraw_host_rrs(AvahiServer *s) {
 719     g_assert(s);
 720
 721     if (s->hinfo_entry_group) {
 722         avahi_entry_group_free(s->hinfo_entry_group);
 723         s->hinfo_entry_group = NULL;
 724     }
 725
 726     if (s->browse_domain_entry_group) {
 727         avahi_entry_group_free(s->browse_domain_entry_group);
 728         s->browse_domain_entry_group = NULL;
 729     }
 730
 731     avahi_update_host_rrs(s->monitor, TRUE);
 732     s->n_host_rr_pending = 0;
 733 }
 734
 735 void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
 736     g_assert(s);
 737
 738     g_assert(s->n_host_rr_pending > 0);
 739
 740     if (--s->n_host_rr_pending == 0)
 741         server_set_state(s, AVAHI_SERVER_RUNNING);
 742 }
 743
 744 void avahi_server_increase_host_rr_pending(AvahiServer *s) {
 745     g_assert(s);
 746
 747     s->n_host_rr_pending ++;
 748 }
 749
 750 void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 751     g_assert(s);
 752     g_assert(g);
 753
 754     if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
 755         s->state == AVAHI_SERVER_REGISTERING)
 756         avahi_server_increase_host_rr_pending(s);
 757     else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
 758         (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
 759         withdraw_host_rrs(s);
 760         server_set_state(s, AVAHI_SERVER_COLLISION);
 761     } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
 762                s->state == AVAHI_SERVER_REGISTERING)
 763         avahi_server_decrease_host_rr_pending(s);
 764 }
 765
 766 static void register_hinfo(AvahiServer *s) {
 767     struct utsname utsname;
 768     AvahiRecord *r;
 769
 770     g_assert(s);
 771
 772     if (!s->config.register_hinfo || s->hinfo_entry_group)
 773         return;
 774
 775     s->hinfo_entry_group = avahi_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
 776
 777     /* Fill in HINFO rr */
 778     r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO);
 779     uname(&utsname);
 780     r->data.hinfo.cpu = g_strdup(g_strup(utsname.machine));
 781     r->data.hinfo.os = g_strdup(g_strup(utsname.sysname));
 782     avahi_server_add(s, s->hinfo_entry_group, 0, AF_UNSPEC, AVAHI_ENTRY_UNIQUE, r);
 783     avahi_record_unref(r);
 784
 785     avahi_entry_group_commit(s->hinfo_entry_group);
 786 }
 787
 788 static void register_localhost(AvahiServer *s) {
 789     AvahiAddress a;
 790     g_assert(s);
 791
 792     /* Add localhost entries */
 793     avahi_address_parse("127.0.0.1", AF_INET, &a);
 794     avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "localhost", &a);
 795
 796     avahi_address_parse("::1", AF_INET6, &a);
 797     avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "ip6-localhost", &a);
 798 }
 799
 800 static void register_browse_domain(AvahiServer *s) {
 801     g_assert(s);
 802
 803     if (!s->config.announce_domain || s->browse_domain_entry_group)
 804         return;
 805
 806     s->browse_domain_entry_group = avahi_entry_group_new(s, NULL, NULL);
 807     avahi_server_add_ptr(s, s->browse_domain_entry_group, 0, AF_UNSPEC, 0, "_browse._dns-sd._udp.local", s->domain_name);
 808     avahi_entry_group_commit(s->browse_domain_entry_group);
 809 }
 810
 811 static void register_stuff(AvahiServer *s) {
 812     g_assert(s);
 813
 814     server_set_state(s, AVAHI_SERVER_REGISTERING);
 815     register_hinfo(s);
 816     register_browse_domain(s);
 817     avahi_update_host_rrs(s->monitor, FALSE);
 818
 819     if (s->n_host_rr_pending == 0)
 820         server_set_state(s, AVAHI_SERVER_RUNNING);
 821 }
 822
 823 static void update_fqdn(AvahiServer *s) {
 824     g_assert(s);
 825
 826     g_assert(s->host_name);
 827     g_assert(s->domain_name);
 828
 829     g_free(s->host_name_fqdn);
 830     s->host_name_fqdn = g_strdup_printf("%s.%s", s->host_name, s->domain_name);
 831 }
 832
 833 static void register_time_event_callback(AvahiTimeEvent *e, gpointer userdata) {
 834     AvahiServer *s = userdata;
 835
 836     g_assert(e);
 837     g_assert(s);
 838
 839     g_assert(e == s->register_time_event);
 840     avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
 841     s->register_time_event = NULL;
 842
 843     if (s->state == AVAHI_SERVER_SLEEPING)
 844         register_stuff(s);
 845 }
 846
 847 static void delayed_register_stuff(AvahiServer *s) {
 848     GTimeVal tv;
 849
 850     g_assert(s);
 851
 852     avahi_elapse_time(&tv, AVAHI_HOST_RR_HOLDOFF_MSEC, 0);
 853
 854     if (s->register_time_event)
 855         avahi_time_event_queue_update(s->time_event_queue, s->register_time_event, &tv);
 856     else
 857         s->register_time_event = avahi_time_event_queue_add(s->time_event_queue, &tv, register_time_event_callback, s);
 858 }
 859
 860 void avahi_server_set_host_name(AvahiServer *s, const gchar *host_name) {
 861     g_assert(s);
 862     g_assert(host_name);
 863
 864     server_set_state(s, AVAHI_SERVER_SLEEPING);
 865     withdraw_host_rrs(s);
 866
 867     g_free(s->host_name);
 868     s->host_name = host_name ? avahi_normalize_name(host_name) : avahi_get_host_name();
 869     s->host_name[strcspn(s->host_name, ".")] = 0;
 870     update_fqdn(s);
 871
 872     delayed_register_stuff(s);
 873 }
 874
 875 void avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name) {
 876     g_assert(s);
 877     g_assert(domain_name);
 878
 879     server_set_state(s, AVAHI_SERVER_SLEEPING);
 880     withdraw_host_rrs(s);
 881
 882     g_free(s->domain_name);
 883     s->domain_name = domain_name ? avahi_normalize_name(domain_name) : g_strdup("local.");
 884     update_fqdn(s);
 885
 886     delayed_register_stuff(s);
 887 }
 888
 889 AvahiServer *avahi_server_new(GMainContext *c, const AvahiServerConfig *sc, AvahiServerCallback callback, gpointer userdata) {
 890     AvahiServer *s;
 891
 892     static GSourceFuncs source_funcs = {
 893         prepare_func,
 894         check_func,
 895         dispatch_func,
 896         NULL,
 897         NULL,
 898         NULL
 899     };
 900
 901     s = g_new(AvahiServer, 1);
 902     s->n_host_rr_pending = 0;
 903     s->need_entry_cleanup = s->need_group_cleanup = FALSE;
 904
 905     if (sc)
 906         avahi_server_config_copy(&s->config, sc);
 907     else
 908         avahi_server_config_init(&s->config);
 909
 910     s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4() : -1;
 911     s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6() : -1;
 912
 913     if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
 914         g_critical("Selected neither IPv6 nor IPv4 support, aborting.\n");
 915         avahi_server_config_free(&s->config);
 916         g_free(s);
 917         return NULL;
 918     }
 919
 920     if (s->fd_ipv4 < 0 && s->config.use_ipv4)
 921         g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
 922     else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
 923         g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
 924
 925     if (c)
 926         g_main_context_ref(s->context = c);
 927     else
 928         s->context = g_main_context_default();
 929
 930     /* Prepare IO source registration */
 931     s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(AvahiServer*));
 932     *((AvahiServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
 933
 934     memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
 935     s->pollfd_ipv4.fd = s->fd_ipv4;
 936     s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
 937     g_source_add_poll(s->source, &s->pollfd_ipv4);
 938
 939     memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
 940     s->pollfd_ipv6.fd = s->fd_ipv6;
 941     s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
 942     g_source_add_poll(s->source, &s->pollfd_ipv6);
 943
 944     g_source_attach(s->source, s->context);
 945
 946     s->callback = callback;
 947     s->userdata = userdata;
 948
 949     AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
 950     s->entries_by_key = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
 951     AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
 952
 953     AVAHI_LLIST_HEAD_INIT(AvahiRecordResolver, s->record_resolvers);
 954     s->record_resolver_hashtable = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
 955     AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, s->host_name_resolvers);
 956     AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, s->address_resolvers);
 957
 958     /* Get host name */
 959     s->host_name = s->config.host_name ? avahi_normalize_name(s->config.host_name) : avahi_get_host_name();
 960     s->host_name[strcspn(s->host_name, ".")] = 0;
 961     s->domain_name = s->config.domain_name ? avahi_normalize_name(s->config.domain_name) : g_strdup("local.");
 962     s->host_name_fqdn = NULL;
 963     update_fqdn(s);
 964
 965     s->record_list = avahi_record_list_new();
 966
 967     s->time_event_queue = avahi_time_event_queue_new(s->context, G_PRIORITY_DEFAULT+10); /* Slightly less priority than the FDs */
 968     s->register_time_event = NULL;
 969
 970     s->state = AVAHI_SERVER_INVALID;
 971
 972     s->monitor = avahi_interface_monitor_new(s);
 973     avahi_interface_monitor_sync(s->monitor);
 974
 975     register_localhost(s);
 976
 977     s->hinfo_entry_group = NULL;
 978     s->browse_domain_entry_group = NULL;
 979     register_stuff(s);
 980
 981     return s;
 982 }
 983
 984 void avahi_server_free(AvahiServer* s) {
 985     g_assert(s);
 986
 987     while(s->entries)
 988         free_entry(s, s->entries);
 989
 990     avahi_interface_monitor_free(s->monitor);
 991
 992     while (s->groups)
 993         free_group(s, s->groups);
 994
 995     while (s->host_name_resolvers)
 996         avahi_host_name_resolver_free(s->host_name_resolvers);
 997     while (s->address_resolvers)
 998         avahi_address_resolver_free(s->address_resolvers);
 999     while (s->record_resolvers)
1000         avahi_record_resolver_free(s->record_resolvers);
1001     g_hash_table_destroy(s->record_resolver_hashtable);
1002
1003     g_hash_table_destroy(s->entries_by_key);
1004
1005     if (s->register_time_event)
1006         avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
1007     avahi_time_event_queue_free(s->time_event_queue);
1008
1009     avahi_record_list_free(s->record_list);
1010
1011     if (s->fd_ipv4 >= 0)
1012         close(s->fd_ipv4);
1013     if (s->fd_ipv6 >= 0)
1014         close(s->fd_ipv6);
1015
1016     g_free(s->host_name);
1017     g_free(s->domain_name);
1018     g_free(s->host_name_fqdn);
1019
1020     g_source_destroy(s->source);
1021     g_source_unref(s->source);
1022     g_main_context_unref(s->context);
1023
1024     avahi_server_config_free(&s->config);
1025
1026     g_free(s);
1027 }
1028
1029 void avahi_server_add(
1030     AvahiServer *s,
1031     AvahiEntryGroup *g,
1032     gint interface,
1033     guchar protocol,
1034     AvahiEntryFlags flags,
1035     AvahiRecord *r) {
1036
1037     AvahiEntry *e, *t;
1038     g_assert(s);
1039     g_assert(r);
1040
1041     g_assert(r->key->type != AVAHI_DNS_TYPE_ANY);
1042
1043     e = g_new(AvahiEntry, 1);
1044     e->server = s;
1045     e->record = avahi_record_ref(r);
1046     e->group = g;
1047     e->interface = interface;
1048     e->protocol = protocol;
1049     e->flags = flags;
1050     e->dead = FALSE;
1051
1052     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, e->announcements);
1053
1054     AVAHI_LLIST_PREPEND(AvahiEntry, entries, s->entries, e);
1055
1056     /* Insert into hash table indexed by name */
1057     t = g_hash_table_lookup(s->entries_by_key, e->record->key);
1058     AVAHI_LLIST_PREPEND(AvahiEntry, by_key, t, e);
1059     g_hash_table_replace(s->entries_by_key, e->record->key, t);
1060
1061     /* Insert into group list */
1062     if (g)
1063         AVAHI_LLIST_PREPEND(AvahiEntry, by_group, g->entries, e);
1064
1065     avahi_announce_entry(s, e);
1066 }
1067 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state) {
1068     AvahiEntry **e = (AvahiEntry**) state;
1069     g_assert(s);
1070     g_assert(e);
1071
1072     if (!*e)
1073         *e = g ? g->entries : s->entries;
1074
1075     while (*e && (*e)->dead)
1076         *e = g ? (*e)->by_group_next : (*e)->entries_next;
1077
1078     if (!*e)
1079         return NULL;
1080
1081     return avahi_record_ref((*e)->record);
1082 }
1083
1084 void avahi_server_dump(AvahiServer *s, FILE *f) {
1085     AvahiEntry *e;
1086     g_assert(s);
1087     g_assert(f);
1088
1089     fprintf(f, "\n;;; ZONE DUMP FOLLOWS ;;;\n");
1090
1091     for (e = s->entries; e; e = e->entries_next) {
1092         gchar *t;
1093
1094         if (e->dead)
1095             continue;
1096
1097         t = avahi_record_to_string(e->record);
1098         fprintf(f, "%s ; iface=%i proto=%i\n", t, e->interface, e->protocol);
1099         g_free(t);
1100     }
1101
1102     avahi_dump_caches(s->monitor, f);
1103 }
1104
1105 void avahi_server_add_ptr(
1106     AvahiServer *s,
1107     AvahiEntryGroup *g,
1108     gint interface,
1109     guchar protocol,
1110     AvahiEntryFlags flags,
1111     const gchar *name,
1112     const gchar *dest) {
1113
1114     AvahiRecord *r;
1115
1116     g_assert(dest);
1117
1118     r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
1119     r->data.ptr.name = avahi_normalize_name(dest);
1120     avahi_server_add(s, g, interface, protocol, flags, r);
1121     avahi_record_unref(r);
1122 }
1123
1124 void avahi_server_add_address(
1125     AvahiServer *s,
1126     AvahiEntryGroup *g,
1127     gint interface,
1128     guchar protocol,
1129     AvahiEntryFlags flags,
1130     const gchar *name,
1131     AvahiAddress *a) {
1132
1133     gchar *n = NULL;
1134     g_assert(s);
1135     g_assert(a);
1136
1137     name = name ? (n = avahi_normalize_name(name)) : s->host_name_fqdn;
1138
1139     if (a->family == AF_INET) {
1140         gchar *reverse;
1141         AvahiRecord  *r;
1142
1143         r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
1144         r->data.a.address = a->data.ipv4;
1145         avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1146         avahi_record_unref(r);
1147
1148         reverse = avahi_reverse_lookup_name_ipv4(&a->data.ipv4);
1149         avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1150         g_free(reverse);
1151
1152     } else {
1153         gchar *reverse;
1154         AvahiRecord *r;
1155
1156         r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
1157         r->data.aaaa.address = a->data.ipv6;
1158         avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1159         avahi_record_unref(r);
1160
1161         reverse = avahi_reverse_lookup_name_ipv6_arpa(&a->data.ipv6);
1162         avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1163         g_free(reverse);
1164
1165         reverse = avahi_reverse_lookup_name_ipv6_int(&a->data.ipv6);
1166         avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1167         g_free(reverse);
1168     }
1169
1170     g_free(n);
1171 }
1172
1173 void avahi_server_add_text_strlst(
1174     AvahiServer *s,
1175     AvahiEntryGroup *g,
1176     gint interface,
1177     guchar protocol,
1178     AvahiEntryFlags flags,
1179     const gchar *name,
1180     AvahiStringList *strlst) {
1181
1182     AvahiRecord *r;
1183
1184     g_assert(s);
1185
1186     r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
1187     r->data.txt.string_list = strlst;
1188     avahi_server_add(s, g, interface, protocol, flags, r);
1189     avahi_record_unref(r);
1190 }
1191
1192 void avahi_server_add_text_va(
1193     AvahiServer *s,
1194     AvahiEntryGroup *g,
1195     gint interface,
1196     guchar protocol,
1197     AvahiEntryFlags flags,
1198     const gchar *name,
1199     va_list va) {
1200
1201     g_assert(s);
1202
1203     avahi_server_add_text_strlst(s, g, interface, protocol, flags, name, avahi_string_list_new_va(va));
1204 }
1205
1206 void avahi_server_add_text(
1207     AvahiServer *s,
1208     AvahiEntryGroup *g,
1209     gint interface,
1210     guchar protocol,
1211     AvahiEntryFlags flags,
1212     const gchar *name,
1213     ...) {
1214
1215     va_list va;
1216
1217     g_assert(s);
1218
1219     va_start(va, name);
1220     avahi_server_add_text_va(s, g, interface, protocol, flags, name, va);
1221     va_end(va);
1222 }
1223
1224 static void escape_service_name(gchar *d, guint size, const gchar *s) {
1225     g_assert(d);
1226     g_assert(size);
1227     g_assert(s);
1228
1229     while (*s && size >= 2) {
1230         if (*s == '.' || *s == '\\') {
1231             if (size < 3)
1232                 break;
1233
1234             *(d++) = '\\';
1235             size--;
1236         }
1237
1238         *(d++) = *(s++);
1239         size--;
1240     }
1241
1242     g_assert(size > 0);
1243     *(d++) = 0;
1244 }
1245
1246 void avahi_server_add_service_strlst(
1247     AvahiServer *s,
1248     AvahiEntryGroup *g,
1249     gint interface,
1250     guchar protocol,
1251     const gchar *type,
1252     const gchar *name,
1253     const gchar *domain,
1254     const gchar *host,
1255     guint16 port,
1256     AvahiStringList *strlst) {
1257
1258     gchar ptr_name[256], svc_name[256], ename[64], enum_ptr[256];
1259     AvahiRecord *r;
1260
1261     g_assert(s);
1262     g_assert(type);
1263     g_assert(name);
1264
1265     escape_service_name(ename, sizeof(ename), name);
1266
1267     if (domain) {
1268         while (domain[0] == '.')
1269             domain++;
1270     } else
1271         domain = s->domain_name;
1272
1273     if (!host)
1274         host = s->host_name_fqdn;
1275
1276     snprintf(ptr_name, sizeof(ptr_name), "%s.%s", type, domain);
1277     snprintf(svc_name, sizeof(svc_name), "%s.%s.%s", ename, type, domain);
1278
1279     avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, ptr_name, svc_name);
1280
1281     r = avahi_record_new_full(svc_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
1282     r->data.srv.priority = 0;
1283     r->data.srv.weight = 0;
1284     r->data.srv.port = port;
1285     r->data.srv.name = avahi_normalize_name(host);
1286     avahi_server_add(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, r);
1287     avahi_record_unref(r);
1288
1289     avahi_server_add_text_strlst(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, svc_name, strlst);
1290
1291     snprintf(enum_ptr, sizeof(enum_ptr), "_services._dns-sd._udp.%s", domain);
1292     avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, enum_ptr, ptr_name);
1293 }
1294
1295 void avahi_server_add_service_va(
1296     AvahiServer *s,
1297     AvahiEntryGroup *g,
1298     gint interface,
1299     guchar protocol,
1300     const gchar *type,
1301     const gchar *name,
1302     const gchar *domain,
1303     const gchar *host,
1304     guint16 port,
1305     va_list va){
1306
1307     g_assert(s);
1308     g_assert(type);
1309     g_assert(name);
1310
1311     avahi_server_add_service_strlst(s, g, interface, protocol, type, name, domain, host, port, avahi_string_list_new_va(va));
1312 }
1313
1314 void avahi_server_add_service(
1315     AvahiServer *s,
1316     AvahiEntryGroup *g,
1317     gint interface,
1318     guchar protocol,
1319     const gchar *type,
1320     const gchar *name,
1321     const gchar *domain,
1322     const gchar *host,
1323     guint16 port,
1324     ... ){
1325
1326     va_list va;
1327
1328     g_assert(s);
1329     g_assert(type);
1330     g_assert(name);
1331
1332     va_start(va, port);
1333     avahi_server_add_service_va(s, g, interface, protocol, type, name, domain, host, port, va);
1334     va_end(va);
1335 }
1336
1337 static void post_query_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
1338     AvahiKey *k = userdata;
1339
1340     g_assert(m);
1341     g_assert(i);
1342     g_assert(k);
1343
1344     avahi_interface_post_query(i, k, FALSE);
1345 }
1346
1347 void avahi_server_post_query(AvahiServer *s, gint interface, guchar protocol, AvahiKey *key) {
1348     g_assert(s);
1349     g_assert(key);
1350
1351     avahi_interface_monitor_walk(s->monitor, interface, protocol, post_query_callback, key);
1352 }
1353
1354 void avahi_entry_group_change_state(AvahiEntryGroup *g, AvahiEntryGroupState state) {
1355     g_assert(g);
1356
1357     if (g->state == state)
1358         return;
1359
1360     g->state = state;
1361
1362     if (g->callback) {
1363         g->callback(g->server, g, state, g->userdata);
1364         return;
1365     }
1366 }
1367
1368 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata) {
1369     AvahiEntryGroup *g;
1370
1371     g_assert(s);
1372
1373     g = g_new(AvahiEntryGroup, 1);
1374     g->server = s;
1375     g->callback = callback;
1376     g->userdata = userdata;
1377     g->dead = FALSE;
1378     g->state = AVAHI_ENTRY_GROUP_UNCOMMITED;
1379     g->n_probing = 0;
1380     AVAHI_LLIST_HEAD_INIT(AvahiEntry, g->entries);
1381
1382     AVAHI_LLIST_PREPEND(AvahiEntryGroup, groups, s->groups, g);
1383     return g;
1384 }
1385
1386 void avahi_entry_group_free(AvahiEntryGroup *g) {
1387     AvahiEntry *e;
1388
1389     g_assert(g);
1390     g_assert(g->server);
1391
1392     for (e = g->entries; e; e = e->by_group_next) {
1393         avahi_goodbye_entry(g->server, e, TRUE);
1394         e->dead = TRUE;
1395     }
1396
1397     g->dead = TRUE;
1398
1399     g->server->need_group_cleanup = TRUE;
1400     g->server->need_entry_cleanup = TRUE;
1401 }
1402
1403 void avahi_entry_group_commit(AvahiEntryGroup *g) {
1404     g_assert(g);
1405     g_assert(!g->dead);
1406
1407     if (g->state != AVAHI_ENTRY_GROUP_UNCOMMITED)
1408         return;
1409
1410     avahi_entry_group_change_state(g, AVAHI_ENTRY_GROUP_REGISTERING);
1411     avahi_announce_group(g->server, g);
1412     avahi_entry_group_check_probed(g, FALSE);
1413 }
1414
1415 gboolean avahi_entry_commited(AvahiEntry *e) {
1416     g_assert(e);
1417     g_assert(!e->dead);
1418
1419     return !e->group ||
1420         e->group->state == AVAHI_ENTRY_GROUP_REGISTERING ||
1421         e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED;
1422 }
1423
1424 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g) {
1425     g_assert(g);
1426     g_assert(!g->dead);
1427
1428     return g->state;
1429 }
1430
1431 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata) {
1432     g_assert(g);
1433
1434     g->userdata = userdata;
1435 }
1436
1437 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g) {
1438     g_assert(g);
1439
1440     return g->userdata;
1441 }
1442
1443 const gchar* avahi_server_get_domain_name(AvahiServer *s) {
1444     g_assert(s);
1445
1446     return s->domain_name;
1447 }
1448
1449 const gchar* avahi_server_get_host_name(AvahiServer *s) {
1450     g_assert(s);
1451
1452     return s->host_name;
1453 }
1454
1455 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s) {
1456     g_assert(s);
1457
1458     return s->host_name_fqdn;
1459 }
1460
1461 gpointer avahi_server_get_data(AvahiServer *s) {
1462     g_assert(s);
1463
1464     return s->userdata;
1465 }
1466
1467 void avahi_server_set_data(AvahiServer *s, gpointer userdata) {
1468     g_assert(s);
1469
1470     s->userdata = userdata;
1471 }
1472
1473 AvahiServerState avhai_server_get_state(AvahiServer *s) {
1474     g_assert(s);
1475
1476     return s->state;
1477 }
1478
1479 AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
1480     g_assert(c);
1481
1482     memset(c, 0, sizeof(AvahiServerConfig));
1483     c->register_hinfo = TRUE;
1484     c->register_addresses = TRUE;
1485     c->use_ipv6 = TRUE;
1486     c->use_ipv4 = TRUE;
1487     c->host_name = NULL;
1488     c->domain_name = NULL;
1489     c->check_response_ttl = TRUE;
1490     c->announce_domain = TRUE;
1491     c->use_iff_running = FALSE;
1492
1493     return c;
1494 }
1495
1496 void avahi_server_config_free(AvahiServerConfig *c) {
1497     g_assert(c);
1498
1499     g_free(c->host_name);
1500     g_free(c->domain_name);
1501 }
1502
1503 AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
1504     g_assert(ret);
1505     g_assert(c);
1506
1507     *ret = *c;
1508
1509     ret->host_name = g_strdup(c->host_name);
1510     ret->domain_name = g_strdup(c->domain_name);
1511
1512     return ret;
1513 }