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 "browse.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     if (s->need_browser_cleanup)
 107         avahi_browser_cleanup(s);
 108 }
 109
 110 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) {
 111     AvahiKey *k;
 112     AvahiEntry *e;
 113
 114     g_assert(s);
 115     g_assert(i);
 116     g_assert(name);
 117     g_assert(callback);
 118
 119     g_assert(type != AVAHI_DNS_TYPE_ANY);
 120
 121     k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type);
 122
 123     for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
 124         if (!e->dead && avahi_entry_registered(s, e, i))
 125             callback(s, e->record, e->flags & AVAHI_ENTRY_UNIQUE, userdata);
 126
 127     avahi_key_unref(k);
 128 }
 129
 130 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) {
 131     g_assert(s);
 132     g_assert(i);
 133     g_assert(r);
 134     g_assert(callback);
 135
 136     if (r->key->class == AVAHI_DNS_CLASS_IN) {
 137         if (r->key->type == AVAHI_DNS_TYPE_PTR) {
 138             enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
 139             enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
 140         } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
 141             enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
 142             enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
 143         }
 144     }
 145 }
 146
 147 void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, gboolean unicast_response, gboolean auxiliary) {
 148     g_assert(s);
 149     g_assert(i);
 150     g_assert(e);
 151
 152     avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_ENTRY_UNIQUE, unicast_response, auxiliary);
 153 }
 154
 155 void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, gboolean unicast_response) {
 156     AvahiEntry *e;
 157 /*     gchar *txt; */
 158
 159     g_assert(s);
 160     g_assert(i);
 161     g_assert(k);
 162
 163 /*     g_message("Posting responses matching [%s]", txt = avahi_key_to_string(k)); */
 164 /*     g_free(txt); */
 165
 166     if (avahi_key_is_pattern(k)) {
 167
 168         /* Handle ANY query */
 169
 170         for (e = s->entries; e; e = e->entries_next)
 171             if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_registered(s, e, i))
 172                 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
 173
 174     } else {
 175
 176         /* Handle all other queries */
 177
 178         for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
 179             if (!e->dead && avahi_entry_registered(s, e, i))
 180                 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
 181     }
 182 }
 183
 184 static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
 185     g_assert(s);
 186     g_assert(e);
 187
 188     if (e->group) {
 189         AvahiEntry *k;
 190
 191         for (k = e->group->entries; k; k = k->by_group_next) {
 192             avahi_goodbye_entry(s, k, FALSE);
 193             k->dead = TRUE;
 194         }
 195
 196         avahi_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
 197     } else {
 198         avahi_goodbye_entry(s, e, FALSE);
 199         e->dead = TRUE;
 200     }
 201
 202     s->need_entry_cleanup = TRUE;
 203 }
 204
 205 static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
 206     AvahiEntry *e;
 207
 208     g_assert(s);
 209     g_assert(key);
 210
 211    for (e = g_hash_table_lookup(s->entries_by_key, key); e; e = e->by_key_next)
 212         withdraw_entry(s, e);
 213 }
 214
 215 static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
 216     AvahiEntry *e, *n;
 217     gchar *t;
 218     gboolean ours = FALSE, won = FALSE, lost = FALSE;
 219
 220     g_assert(s);
 221     g_assert(record);
 222     g_assert(i);
 223
 224     for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
 225         gint cmp;
 226         n = e->by_key_next;
 227
 228         if (e->dead || !avahi_entry_probing(s, e, i))
 229             continue;
 230
 231         if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
 232             ours = TRUE;
 233             break;
 234         } else if (cmp > 0)
 235             won = TRUE;
 236         else /* cmp < 0 */
 237             lost = TRUE;
 238     }
 239
 240     t = avahi_record_to_string(record);
 241
 242     if (!ours) {
 243
 244         if (won)
 245             g_message("Recieved conflicting probe [%s]. Local host won.", t);
 246         else if (lost) {
 247             g_message("Recieved conflicting probe [%s]. Local host lost. Withdrawing.", t);
 248             withdraw_rrset(s, record->key);
 249         }
 250     }
 251
 252     g_free(t);
 253 }
 254
 255 static gboolean handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, gboolean unique, const AvahiAddress *a) {
 256     gboolean valid = TRUE, ours = FALSE, conflict = FALSE, withdraw_immediately = FALSE;
 257     AvahiEntry *e, *n, *conflicting_entry = NULL;
 258
 259     g_assert(s);
 260     g_assert(i);
 261     g_assert(record);
 262
 263
 264 /*     g_message("CHECKING FOR CONFLICT: [%s]", t);   */
 265
 266     for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
 267         n = e->by_key_next;
 268
 269         if (e->dead || (!(e->flags & AVAHI_ENTRY_UNIQUE) && !unique))
 270             continue;
 271
 272         /* Either our entry or the other is intended to be unique, so let's check */
 273
 274         if (avahi_entry_registered(s, e, i)) {
 275
 276             if (avahi_record_equal_no_ttl(e->record, record)) {
 277                 ours = TRUE; /* We have an identical record, so this is no conflict */
 278
 279                 /* Check wheter there is a TTL conflict */
 280                 if (record->ttl <= e->record->ttl/2) {
 281                     gchar *t;
 282                     /* Refresh */
 283                     t = avahi_record_to_string(record);
 284
 285                     g_message("Recieved record with bad TTL [%s]. Refreshing.", t);
 286                     avahi_server_prepare_matching_responses(s, i, e->record->key, FALSE);
 287                     valid = FALSE;
 288
 289                     g_free(t);
 290                 }
 291
 292                 /* There's no need to check the other entries of this RRset */
 293                 break;
 294             } else {
 295                 /* A conflict => we have to return to probe mode */
 296                 conflict = TRUE;
 297                 conflicting_entry = e;
 298             }
 299
 300         } else if (avahi_entry_probing(s, e, i)) {
 301
 302             if (!avahi_record_equal_no_ttl(record, e->record)) {
 303
 304                 /* We are currently registering a matching record, but
 305                  * someone else already claimed it, so let's
 306                  * withdraw */
 307                 conflict = TRUE;
 308                 withdraw_immediately = TRUE;
 309             }
 310         }
 311     }
 312
 313 /*     g_message("ours=%i conflict=%i", ours, conflict); */
 314
 315     if (!ours && conflict) {
 316         gchar *t;
 317
 318         valid = FALSE;
 319
 320         t = avahi_record_to_string(record);
 321
 322         if (withdraw_immediately) {
 323             g_message("Recieved conflicting record [%s] with local record to be. Withdrawing.", t);
 324             withdraw_rrset(s, record->key);
 325         } else {
 326             g_assert(conflicting_entry);
 327             g_message("Recieved conflicting record [%s]. Resetting our record.", t);
 328             avahi_entry_return_to_initial_state(s, conflicting_entry, i);
 329
 330             /* Local unique records are returned to probin
 331              * state. Local shared records are reannounced. */
 332         }
 333
 334         g_free(t);
 335     }
 336
 337     return valid;
 338 }
 339
 340 static void append_aux_callback(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata) {
 341     gboolean *unicast_response = userdata;
 342
 343     g_assert(s);
 344     g_assert(r);
 345     g_assert(unicast_response);
 346
 347     avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, TRUE);
 348 }
 349
 350 static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, gboolean unicast_response) {
 351     g_assert(s);
 352     g_assert(r);
 353
 354     avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
 355 }
 356
 357 void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
 358
 359     g_assert(s);
 360     g_assert(i);
 361     g_assert(!legacy_unicast || (a && port > 0 && p));
 362
 363     if (legacy_unicast) {
 364         AvahiDnsPacket *reply;
 365         AvahiRecord *r;
 366
 367         reply = avahi_dns_packet_new_reply(p, 512 /* unicast DNS maximum packet size is 512 */ , TRUE, TRUE);
 368
 369         while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
 370
 371             append_aux_records_to_list(s, i, r, FALSE);
 372
 373             if (avahi_dns_packet_append_record(reply, r, FALSE, 10))
 374                 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
 375             else {
 376                 gchar *t = avahi_record_to_string(r);
 377                 g_warning("Record [%s] not fitting in legacy unicast packet, dropping.", t);
 378                 g_free(t);
 379             }
 380
 381             avahi_record_unref(r);
 382         }
 383
 384         if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
 385             avahi_interface_send_packet_unicast(i, reply, a, port);
 386
 387         avahi_dns_packet_free(reply);
 388
 389     } else {
 390         gboolean unicast_response, flush_cache, auxiliary;
 391         AvahiDnsPacket *reply = NULL;
 392         AvahiRecord *r;
 393
 394         /* In case the query packet was truncated never respond
 395         immediately, because known answer suppression records might be
 396         contained in later packets */
 397         gboolean tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
 398
 399         while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
 400
 401             if (!avahi_interface_post_response(i, r, flush_cache, a, !tc && flush_cache && !auxiliary) && unicast_response) {
 402
 403                 append_aux_records_to_list(s, i, r, unicast_response);
 404
 405                 /* Due to some reasons the record has not been scheduled.
 406                  * The client requested an unicast response in that
 407                  * case. Therefore we prepare such a response */
 408
 409                 for (;;) {
 410
 411                     if (!reply) {
 412                         g_assert(p);
 413                         reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, FALSE, FALSE);
 414                     }
 415
 416                     if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
 417
 418                         /* Appending this record succeeded, so incremeant
 419                          * the specific header field, and return to the caller */
 420
 421                         avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
 422
 423                         break;
 424                     }
 425
 426                     if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
 427                         guint size;
 428
 429                         /* The record is too large for one packet, so create a larger packet */
 430
 431                         avahi_dns_packet_free(reply);
 432                         size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
 433                         if (size > AVAHI_DNS_PACKET_MAX_SIZE)
 434                             size = AVAHI_DNS_PACKET_MAX_SIZE;
 435                         reply = avahi_dns_packet_new_reply(p, size, FALSE, TRUE);
 436
 437                         if (!avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
 438                             avahi_dns_packet_free(reply);
 439
 440                             gchar *t = avahi_record_to_string(r);
 441                             g_warning("Record [%s] too large, doesn't fit in any packet!", t);
 442                             g_free(t);
 443                             break;
 444                         } else
 445                             avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
 446                     }
 447
 448                     /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
 449                     avahi_interface_send_packet_unicast(i, reply, a, port);
 450                     avahi_dns_packet_free(reply);
 451                     reply = NULL;
 452                 }
 453             }
 454
 455             avahi_record_unref(r);
 456         }
 457
 458         if (reply) {
 459             if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
 460                 avahi_interface_send_packet_unicast(i, reply, a, port);
 461             avahi_dns_packet_free(reply);
 462         }
 463     }
 464
 465     avahi_record_list_flush(s->record_list);
 466 }
 467
 468
 469 static void reflect_response(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, gboolean flush_cache) {
 470     AvahiInterface *j;
 471
 472     g_assert(s);
 473     g_assert(i);
 474     g_assert(r);
 475
 476     if (!s->config.enable_reflector)
 477         return;
 478
 479     for (j = s->monitor->interfaces; j; j = j->interface_next)
 480         if (j != i)
 481             avahi_interface_post_response(j, r, flush_cache, NULL, TRUE);
 482 }
 483
 484 static void reflect_query(AvahiServer *s, AvahiInterface *i, AvahiKey *k) {
 485     AvahiInterface *j;
 486
 487     g_assert(s);
 488     g_assert(i);
 489     g_assert(k);
 490
 491     if (!s->config.enable_reflector)
 492         return;
 493
 494     for (j = s->monitor->interfaces; j; j = j->interface_next)
 495         if (j != i)
 496             avahi_interface_post_query(j, k, TRUE);
 497 }
 498
 499 static void reflect_probe(AvahiServer *s, AvahiInterface *i, AvahiRecord *r) {
 500     AvahiInterface *j;
 501
 502     g_assert(s);
 503     g_assert(i);
 504     g_assert(r);
 505
 506     if (!s->config.enable_reflector)
 507         return;
 508
 509     for (j = s->monitor->interfaces; j; j = j->interface_next)
 510         if (j != i)
 511             avahi_interface_post_probe(j, r, TRUE);
 512 }
 513
 514 static void handle_query(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
 515     guint n;
 516
 517     g_assert(s);
 518     g_assert(p);
 519     g_assert(i);
 520     g_assert(a);
 521
 522 /*     g_message("query"); */
 523
 524     g_assert(avahi_record_list_empty(s->record_list));
 525
 526     /* Handle the questions */
 527     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
 528         AvahiKey *key;
 529         gboolean unicast_response = FALSE;
 530
 531         if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
 532             g_warning("Packet too short (1)");
 533             goto fail;
 534         }
 535
 536         reflect_query(s, i, key);
 537         avahi_query_scheduler_incoming(i->query_scheduler, key);
 538         avahi_server_prepare_matching_responses(s, i, key, unicast_response);
 539         avahi_key_unref(key);
 540     }
 541
 542     /* Known Answer Suppression */
 543     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
 544         AvahiRecord *record;
 545         gboolean unique = FALSE;
 546
 547         if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
 548             g_warning("Packet too short (2)");
 549             goto fail;
 550         }
 551
 552         if (handle_conflict(s, i, record, unique, a)) {
 553             avahi_response_scheduler_suppress(i->response_scheduler, record, a);
 554             avahi_record_list_drop(s->record_list, record);
 555         }
 556
 557         avahi_record_unref(record);
 558     }
 559
 560     /* Probe record */
 561     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
 562         AvahiRecord *record;
 563         gboolean unique = FALSE;
 564
 565         if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
 566             g_warning("Packet too short (3)");
 567             goto fail;
 568         }
 569
 570         if (record->key->type != AVAHI_DNS_TYPE_ANY) {
 571             reflect_probe(s, i, record);
 572             incoming_probe(s, record, i);
 573         }
 574
 575         avahi_record_unref(record);
 576     }
 577
 578     if (!avahi_record_list_empty(s->record_list))
 579         avahi_server_generate_response(s, i, p, a, port, legacy_unicast);
 580
 581     return;
 582
 583 fail:
 584     avahi_record_list_flush(s->record_list);
 585
 586 }
 587
 588 static void handle_response(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a) {
 589     guint n;
 590
 591     g_assert(s);
 592     g_assert(p);
 593     g_assert(i);
 594     g_assert(a);
 595
 596 /*     g_message("response"); */
 597
 598     for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
 599              avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
 600         AvahiRecord *record;
 601         gboolean cache_flush = FALSE;
 602 /*         gchar *txt; */
 603
 604         if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
 605             g_warning("Packet too short (4)");
 606             break;
 607         }
 608
 609         if (record->key->type != AVAHI_DNS_TYPE_ANY) {
 610
 611 /*             g_message("Handling response: %s", txt = avahi_record_to_string(record)); */
 612 /*             g_free(txt); */
 613
 614             if (handle_conflict(s, i, record, cache_flush, a)) {
 615                 reflect_response(s, i, record, cache_flush);
 616                 avahi_cache_update(i->cache, record, cache_flush, a);
 617                 avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
 618             }
 619         }
 620
 621         avahi_record_unref(record);
 622     }
 623 }
 624
 625 static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
 626     AvahiInterface *i;
 627     AvahiAddress a;
 628     guint16 port;
 629
 630     g_assert(s);
 631     g_assert(p);
 632     g_assert(sa);
 633     g_assert(iface > 0);
 634
 635     if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, sa->sa_family)) ||
 636         !avahi_interface_relevant(i)) {
 637         g_warning("Recieved packet from invalid interface.");
 638         return;
 639     }
 640
 641 /*     g_message("new packet recieved on interface '%s.%i'.", i->hardware->name, i->protocol); */
 642
 643     if (sa->sa_family == AF_INET6) {
 644         static const guint8 ipv4_in_ipv6[] = {
 645             0x00, 0x00, 0x00, 0x00,
 646             0x00, 0x00, 0x00, 0x00,
 647             0xFF, 0xFF, 0xFF, 0xFF };
 648
 649         /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
 650
 651         if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0)
 652             return;
 653     }
 654
 655     if (avahi_dns_packet_check_valid(p) < 0) {
 656         g_warning("Recieved invalid packet.");
 657         return;
 658     }
 659
 660     port = avahi_port_from_sockaddr(sa);
 661     avahi_address_from_sockaddr(sa, &a);
 662
 663     if (avahi_dns_packet_is_query(p)) {
 664         gboolean legacy_unicast = FALSE;
 665
 666         if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT) != 0) {
 667             g_warning("Invalid query packet.");
 668             return;
 669         }
 670
 671         if (port != AVAHI_MDNS_PORT) {
 672             /* Legacy Unicast */
 673
 674             if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
 675                  avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
 676                 g_warning("Invalid legacy unicast query packet.");
 677                 return;
 678             }
 679
 680             legacy_unicast = TRUE;
 681         }
 682
 683         handle_query(s, p, i, &a, port, legacy_unicast);
 684
 685 /*         g_message("Handled query"); */
 686     } else {
 687
 688         if (port != AVAHI_MDNS_PORT) {
 689             g_warning("Recieved repsonse with invalid source port %u on interface '%s.%i'", port, i->hardware->name, i->protocol);
 690             return;
 691         }
 692
 693         if (ttl != 255) {
 694             g_warning("Recieved response with invalid TTL %u on interface '%s.%i'.", ttl, i->hardware->name, i->protocol);
 695             if (s->config.check_response_ttl)
 696                 return;
 697         }
 698
 699         if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
 700             avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
 701             avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
 702             g_warning("Invalid response packet.");
 703             return;
 704         }
 705
 706         handle_response(s, p, i, &a);
 707 /*         g_message("Handled response"); */
 708     }
 709 }
 710
 711 static void work(AvahiServer *s) {
 712     struct sockaddr_in6 sa6;
 713     struct sockaddr_in sa;
 714     AvahiDnsPacket *p;
 715     gint iface = 0;
 716     guint8 ttl;
 717
 718     g_assert(s);
 719
 720     if (s->pollfd_ipv4.revents & G_IO_IN) {
 721         if ((p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl))) {
 722             dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
 723             avahi_dns_packet_free(p);
 724         }
 725     }
 726
 727     if (s->pollfd_ipv6.revents & G_IO_IN) {
 728         if ((p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl))) {
 729             dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
 730             avahi_dns_packet_free(p);
 731         }
 732     }
 733 }
 734
 735 static gboolean prepare_func(GSource *source, gint *timeout) {
 736     g_assert(source);
 737     g_assert(timeout);
 738
 739     *timeout = -1;
 740     return FALSE;
 741 }
 742
 743 static gboolean check_func(GSource *source) {
 744     AvahiServer* s;
 745     g_assert(source);
 746
 747     s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
 748     g_assert(s);
 749
 750     return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
 751 }
 752
 753 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
 754     AvahiServer* s;
 755     g_assert(source);
 756
 757     s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
 758     g_assert(s);
 759
 760     work(s);
 761     cleanup_dead(s);
 762
 763     return TRUE;
 764 }
 765
 766 static void server_set_state(AvahiServer *s, AvahiServerState state) {
 767     g_assert(s);
 768
 769     if (s->state == state)
 770         return;
 771
 772     s->state = state;
 773
 774     if (s->callback)
 775         s->callback(s, state, s->userdata);
 776 }
 777
 778 static void withdraw_host_rrs(AvahiServer *s) {
 779     g_assert(s);
 780
 781     if (s->hinfo_entry_group) {
 782         avahi_entry_group_free(s->hinfo_entry_group);
 783         s->hinfo_entry_group = NULL;
 784     }
 785
 786     if (s->browse_domain_entry_group) {
 787         avahi_entry_group_free(s->browse_domain_entry_group);
 788         s->browse_domain_entry_group = NULL;
 789     }
 790
 791     avahi_update_host_rrs(s->monitor, TRUE);
 792     s->n_host_rr_pending = 0;
 793 }
 794
 795 void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
 796     g_assert(s);
 797
 798     g_assert(s->n_host_rr_pending > 0);
 799
 800     if (--s->n_host_rr_pending == 0)
 801         server_set_state(s, AVAHI_SERVER_RUNNING);
 802 }
 803
 804 void avahi_server_increase_host_rr_pending(AvahiServer *s) {
 805     g_assert(s);
 806
 807     s->n_host_rr_pending ++;
 808 }
 809
 810 void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
 811     g_assert(s);
 812     g_assert(g);
 813
 814     if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
 815         s->state == AVAHI_SERVER_REGISTERING)
 816         avahi_server_increase_host_rr_pending(s);
 817     else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
 818         (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
 819         withdraw_host_rrs(s);
 820         server_set_state(s, AVAHI_SERVER_COLLISION);
 821     } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
 822                s->state == AVAHI_SERVER_REGISTERING)
 823         avahi_server_decrease_host_rr_pending(s);
 824 }
 825
 826 static void register_hinfo(AvahiServer *s) {
 827     struct utsname utsname;
 828     AvahiRecord *r;
 829
 830     g_assert(s);
 831
 832     if (!s->config.register_hinfo || s->hinfo_entry_group)
 833         return;
 834
 835     s->hinfo_entry_group = avahi_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
 836
 837     /* Fill in HINFO rr */
 838     r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO);
 839     uname(&utsname);
 840     r->data.hinfo.cpu = g_strdup(g_strup(utsname.machine));
 841     r->data.hinfo.os = g_strdup(g_strup(utsname.sysname));
 842     avahi_server_add(s, s->hinfo_entry_group, 0, AF_UNSPEC, AVAHI_ENTRY_UNIQUE, r);
 843     avahi_record_unref(r);
 844
 845     avahi_entry_group_commit(s->hinfo_entry_group);
 846 }
 847
 848 static void register_localhost(AvahiServer *s) {
 849     AvahiAddress a;
 850     g_assert(s);
 851
 852     /* Add localhost entries */
 853     avahi_address_parse("127.0.0.1", AF_INET, &a);
 854     avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "localhost", &a);
 855
 856     avahi_address_parse("::1", AF_INET6, &a);
 857     avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "ip6-localhost", &a);
 858 }
 859
 860 static void register_browse_domain(AvahiServer *s) {
 861     g_assert(s);
 862
 863     if (!s->config.announce_domain || s->browse_domain_entry_group)
 864         return;
 865
 866     s->browse_domain_entry_group = avahi_entry_group_new(s, NULL, NULL);
 867     avahi_server_add_ptr(s, s->browse_domain_entry_group, 0, AF_UNSPEC, 0, "_browse._dns-sd._udp.local", s->domain_name);
 868     avahi_entry_group_commit(s->browse_domain_entry_group);
 869 }
 870
 871 static void register_stuff(AvahiServer *s) {
 872     g_assert(s);
 873
 874     server_set_state(s, AVAHI_SERVER_REGISTERING);
 875     register_hinfo(s);
 876     register_browse_domain(s);
 877     avahi_update_host_rrs(s->monitor, FALSE);
 878
 879     if (s->n_host_rr_pending == 0)
 880         server_set_state(s, AVAHI_SERVER_RUNNING);
 881 }
 882
 883 static void update_fqdn(AvahiServer *s) {
 884     g_assert(s);
 885
 886     g_assert(s->host_name);
 887     g_assert(s->domain_name);
 888
 889     g_free(s->host_name_fqdn);
 890     s->host_name_fqdn = g_strdup_printf("%s.%s", s->host_name, s->domain_name);
 891 }
 892
 893 static void register_time_event_callback(AvahiTimeEvent *e, gpointer userdata) {
 894     AvahiServer *s = userdata;
 895
 896     g_assert(e);
 897     g_assert(s);
 898
 899     g_assert(e == s->register_time_event);
 900     avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
 901     s->register_time_event = NULL;
 902
 903     if (s->state == AVAHI_SERVER_SLEEPING)
 904         register_stuff(s);
 905 }
 906
 907 static void delayed_register_stuff(AvahiServer *s) {
 908     GTimeVal tv;
 909
 910     g_assert(s);
 911
 912     avahi_elapse_time(&tv, AVAHI_HOST_RR_HOLDOFF_MSEC, 0);
 913
 914     if (s->register_time_event)
 915         avahi_time_event_queue_update(s->time_event_queue, s->register_time_event, &tv);
 916     else
 917         s->register_time_event = avahi_time_event_queue_add(s->time_event_queue, &tv, register_time_event_callback, s);
 918 }
 919
 920 void avahi_server_set_host_name(AvahiServer *s, const gchar *host_name) {
 921     g_assert(s);
 922     g_assert(host_name);
 923
 924     server_set_state(s, AVAHI_SERVER_SLEEPING);
 925     withdraw_host_rrs(s);
 926
 927     g_free(s->host_name);
 928     s->host_name = host_name ? avahi_normalize_name(host_name) : avahi_get_host_name();
 929     s->host_name[strcspn(s->host_name, ".")] = 0;
 930     update_fqdn(s);
 931
 932     delayed_register_stuff(s);
 933 }
 934
 935 void avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name) {
 936     g_assert(s);
 937     g_assert(domain_name);
 938
 939     server_set_state(s, AVAHI_SERVER_SLEEPING);
 940     withdraw_host_rrs(s);
 941
 942     g_free(s->domain_name);
 943     s->domain_name = domain_name ? avahi_normalize_name(domain_name) : g_strdup("local.");
 944     update_fqdn(s);
 945
 946     delayed_register_stuff(s);
 947 }
 948
 949 AvahiServer *avahi_server_new(GMainContext *c, const AvahiServerConfig *sc, AvahiServerCallback callback, gpointer userdata) {
 950     AvahiServer *s;
 951
 952     static GSourceFuncs source_funcs = {
 953         prepare_func,
 954         check_func,
 955         dispatch_func,
 956         NULL,
 957         NULL,
 958         NULL
 959     };
 960
 961     s = g_new(AvahiServer, 1);
 962     s->n_host_rr_pending = 0;
 963     s->need_entry_cleanup = s->need_group_cleanup = s->need_browser_cleanup = FALSE;
 964
 965     if (sc)
 966         avahi_server_config_copy(&s->config, sc);
 967     else
 968         avahi_server_config_init(&s->config);
 969
 970     s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4() : -1;
 971     s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6() : -1;
 972
 973     if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
 974         g_critical("Selected neither IPv6 nor IPv4 support, aborting.\n");
 975         avahi_server_config_free(&s->config);
 976         g_free(s);
 977         return NULL;
 978     }
 979
 980     if (s->fd_ipv4 < 0 && s->config.use_ipv4)
 981         g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
 982     else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
 983         g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
 984
 985     if (c)
 986         g_main_context_ref(s->context = c);
 987     else
 988         s->context = g_main_context_default();
 989
 990     /* Prepare IO source registration */
 991     s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(AvahiServer*));
 992     *((AvahiServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
 993
 994     memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
 995     s->pollfd_ipv4.fd = s->fd_ipv4;
 996     s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
 997     g_source_add_poll(s->source, &s->pollfd_ipv4);
 998
 999     memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
1000     s->pollfd_ipv6.fd = s->fd_ipv6;
1001     s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
1002     g_source_add_poll(s->source, &s->pollfd_ipv6);
1003
1004     g_source_attach(s->source, s->context);
1005
1006     s->callback = callback;
1007     s->userdata = userdata;
1008
1009     AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
1010     s->entries_by_key = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
1011     AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
1012
1013     AVAHI_LLIST_HEAD_INIT(AvahiRecordBrowser, s->record_browsers);
1014     s->record_browser_hashtable = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
1015     AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, s->host_name_resolvers);
1016     AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, s->address_resolvers);
1017     AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, s->domain_browsers);
1018     AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, s->service_type_browsers);
1019     AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, s->service_browsers);
1020     AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, s->service_resolvers);
1021
1022     /* Get host name */
1023     s->host_name = s->config.host_name ? avahi_normalize_name(s->config.host_name) : avahi_get_host_name();
1024     s->host_name[strcspn(s->host_name, ".")] = 0;
1025     s->domain_name = s->config.domain_name ? avahi_normalize_name(s->config.domain_name) : g_strdup("local.");
1026     s->host_name_fqdn = NULL;
1027     update_fqdn(s);
1028
1029     s->record_list = avahi_record_list_new();
1030
1031     s->time_event_queue = avahi_time_event_queue_new(s->context, G_PRIORITY_DEFAULT+10); /* Slightly less priority than the FDs */
1032     s->register_time_event = NULL;
1033
1034     s->state = AVAHI_SERVER_INVALID;
1035
1036     s->monitor = avahi_interface_monitor_new(s);
1037     avahi_interface_monitor_sync(s->monitor);
1038
1039     register_localhost(s);
1040
1041     s->hinfo_entry_group = NULL;
1042     s->browse_domain_entry_group = NULL;
1043     register_stuff(s);
1044
1045     return s;
1046 }
1047
1048 void avahi_server_free(AvahiServer* s) {
1049     g_assert(s);
1050
1051     while(s->entries)
1052         free_entry(s, s->entries);
1053
1054     avahi_interface_monitor_free(s->monitor);
1055
1056     while (s->groups)
1057         free_group(s, s->groups);
1058
1059     while (s->host_name_resolvers)
1060         avahi_host_name_resolver_free(s->host_name_resolvers);
1061     while (s->address_resolvers)
1062         avahi_address_resolver_free(s->address_resolvers);
1063     while (s->domain_browsers)
1064         avahi_domain_browser_free(s->domain_browsers);
1065     while (s->service_type_browsers)
1066         avahi_service_type_browser_free(s->service_type_browsers);
1067     while (s->service_browsers)
1068         avahi_service_browser_free(s->service_browsers);
1069     while (s->service_resolvers)
1070         avahi_service_resolver_free(s->service_resolvers);
1071     while (s->record_browsers)
1072         avahi_record_browser_destroy(s->record_browsers);
1073     g_hash_table_destroy(s->record_browser_hashtable);
1074
1075     g_hash_table_destroy(s->entries_by_key);
1076
1077     if (s->register_time_event)
1078         avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
1079     avahi_time_event_queue_free(s->time_event_queue);
1080
1081     avahi_record_list_free(s->record_list);
1082
1083     if (s->fd_ipv4 >= 0)
1084         close(s->fd_ipv4);
1085     if (s->fd_ipv6 >= 0)
1086         close(s->fd_ipv6);
1087
1088     g_free(s->host_name);
1089     g_free(s->domain_name);
1090     g_free(s->host_name_fqdn);
1091
1092     g_source_destroy(s->source);
1093     g_source_unref(s->source);
1094     g_main_context_unref(s->context);
1095
1096     avahi_server_config_free(&s->config);
1097
1098     g_free(s);
1099 }
1100
1101 void avahi_server_add(
1102     AvahiServer *s,
1103     AvahiEntryGroup *g,
1104     gint interface,
1105     guchar protocol,
1106     AvahiEntryFlags flags,
1107     AvahiRecord *r) {
1108
1109     AvahiEntry *e, *t;
1110     g_assert(s);
1111     g_assert(r);
1112
1113     g_assert(r->key->type != AVAHI_DNS_TYPE_ANY);
1114
1115     e = g_new(AvahiEntry, 1);
1116     e->server = s;
1117     e->record = avahi_record_ref(r);
1118     e->group = g;
1119     e->interface = interface;
1120     e->protocol = protocol;
1121     e->flags = flags;
1122     e->dead = FALSE;
1123
1124     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, e->announcements);
1125
1126     AVAHI_LLIST_PREPEND(AvahiEntry, entries, s->entries, e);
1127
1128     /* Insert into hash table indexed by name */
1129     t = g_hash_table_lookup(s->entries_by_key, e->record->key);
1130     AVAHI_LLIST_PREPEND(AvahiEntry, by_key, t, e);
1131     g_hash_table_replace(s->entries_by_key, e->record->key, t);
1132
1133     /* Insert into group list */
1134     if (g)
1135         AVAHI_LLIST_PREPEND(AvahiEntry, by_group, g->entries, e);
1136
1137     avahi_announce_entry(s, e);
1138 }
1139 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state) {
1140     AvahiEntry **e = (AvahiEntry**) state;
1141     g_assert(s);
1142     g_assert(e);
1143
1144     if (!*e)
1145         *e = g ? g->entries : s->entries;
1146
1147     while (*e && (*e)->dead)
1148         *e = g ? (*e)->by_group_next : (*e)->entries_next;
1149
1150     if (!*e)
1151         return NULL;
1152
1153     return avahi_record_ref((*e)->record);
1154 }
1155
1156 void avahi_server_dump(AvahiServer *s, FILE *f) {
1157     AvahiEntry *e;
1158     g_assert(s);
1159     g_assert(f);
1160
1161     fprintf(f, "\n;;; ZONE DUMP FOLLOWS ;;;\n");
1162
1163     for (e = s->entries; e; e = e->entries_next) {
1164         gchar *t;
1165
1166         if (e->dead)
1167             continue;
1168
1169         t = avahi_record_to_string(e->record);
1170         fprintf(f, "%s ; iface=%i proto=%i\n", t, e->interface, e->protocol);
1171         g_free(t);
1172     }
1173
1174     avahi_dump_caches(s->monitor, f);
1175 }
1176
1177 void avahi_server_add_ptr(
1178     AvahiServer *s,
1179     AvahiEntryGroup *g,
1180     gint interface,
1181     guchar protocol,
1182     AvahiEntryFlags flags,
1183     const gchar *name,
1184     const gchar *dest) {
1185
1186     AvahiRecord *r;
1187
1188     g_assert(dest);
1189
1190     r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
1191     r->data.ptr.name = avahi_normalize_name(dest);
1192     avahi_server_add(s, g, interface, protocol, flags, r);
1193     avahi_record_unref(r);
1194 }
1195
1196 void avahi_server_add_address(
1197     AvahiServer *s,
1198     AvahiEntryGroup *g,
1199     gint interface,
1200     guchar protocol,
1201     AvahiEntryFlags flags,
1202     const gchar *name,
1203     AvahiAddress *a) {
1204
1205     gchar *n = NULL;
1206     g_assert(s);
1207     g_assert(a);
1208
1209     name = name ? (n = avahi_normalize_name(name)) : s->host_name_fqdn;
1210
1211     if (a->family == AF_INET) {
1212         gchar *reverse;
1213         AvahiRecord  *r;
1214
1215         r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
1216         r->data.a.address = a->data.ipv4;
1217         avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1218         avahi_record_unref(r);
1219
1220         reverse = avahi_reverse_lookup_name_ipv4(&a->data.ipv4);
1221         avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1222         g_free(reverse);
1223
1224     } else {
1225         gchar *reverse;
1226         AvahiRecord *r;
1227
1228         r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
1229         r->data.aaaa.address = a->data.ipv6;
1230         avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1231         avahi_record_unref(r);
1232
1233         reverse = avahi_reverse_lookup_name_ipv6_arpa(&a->data.ipv6);
1234         avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1235         g_free(reverse);
1236
1237         reverse = avahi_reverse_lookup_name_ipv6_int(&a->data.ipv6);
1238         avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1239         g_free(reverse);
1240     }
1241
1242     g_free(n);
1243 }
1244
1245 void avahi_server_add_text_strlst(
1246     AvahiServer *s,
1247     AvahiEntryGroup *g,
1248     gint interface,
1249     guchar protocol,
1250     AvahiEntryFlags flags,
1251     const gchar *name,
1252     AvahiStringList *strlst) {
1253
1254     AvahiRecord *r;
1255
1256     g_assert(s);
1257
1258     r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
1259     r->data.txt.string_list = strlst;
1260     avahi_server_add(s, g, interface, protocol, flags, r);
1261     avahi_record_unref(r);
1262 }
1263
1264 void avahi_server_add_text_va(
1265     AvahiServer *s,
1266     AvahiEntryGroup *g,
1267     gint interface,
1268     guchar protocol,
1269     AvahiEntryFlags flags,
1270     const gchar *name,
1271     va_list va) {
1272
1273     g_assert(s);
1274
1275     avahi_server_add_text_strlst(s, g, interface, protocol, flags, name, avahi_string_list_new_va(va));
1276 }
1277
1278 void avahi_server_add_text(
1279     AvahiServer *s,
1280     AvahiEntryGroup *g,
1281     gint interface,
1282     guchar protocol,
1283     AvahiEntryFlags flags,
1284     const gchar *name,
1285     ...) {
1286
1287     va_list va;
1288
1289     g_assert(s);
1290
1291     va_start(va, name);
1292     avahi_server_add_text_va(s, g, interface, protocol, flags, name, va);
1293     va_end(va);
1294 }
1295
1296 static void escape_service_name(gchar *d, guint size, const gchar *s) {
1297     g_assert(d);
1298     g_assert(size);
1299     g_assert(s);
1300
1301     while (*s && size >= 2) {
1302         if (*s == '.' || *s == '\\') {
1303             if (size < 3)
1304                 break;
1305
1306             *(d++) = '\\';
1307             size--;
1308         }
1309
1310         *(d++) = *(s++);
1311         size--;
1312     }
1313
1314     g_assert(size > 0);
1315     *(d++) = 0;
1316 }
1317
1318 void avahi_server_add_service_strlst(
1319     AvahiServer *s,
1320     AvahiEntryGroup *g,
1321     gint interface,
1322     guchar protocol,
1323     const gchar *type,
1324     const gchar *name,
1325     const gchar *domain,
1326     const gchar *host,
1327     guint16 port,
1328     AvahiStringList *strlst) {
1329
1330     gchar ptr_name[256], svc_name[256], ename[64], enum_ptr[256];
1331     AvahiRecord *r;
1332
1333     g_assert(s);
1334     g_assert(type);
1335     g_assert(name);
1336
1337     escape_service_name(ename, sizeof(ename), name);
1338
1339     if (domain) {
1340         while (domain[0] == '.')
1341             domain++;
1342     } else
1343         domain = s->domain_name;
1344
1345     if (!host)
1346         host = s->host_name_fqdn;
1347
1348     snprintf(ptr_name, sizeof(ptr_name), "%s.%s", type, domain);
1349     snprintf(svc_name, sizeof(svc_name), "%s.%s.%s", ename, type, domain);
1350
1351     avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, ptr_name, svc_name);
1352
1353     r = avahi_record_new_full(svc_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
1354     r->data.srv.priority = 0;
1355     r->data.srv.weight = 0;
1356     r->data.srv.port = port;
1357     r->data.srv.name = avahi_normalize_name(host);
1358     avahi_server_add(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, r);
1359     avahi_record_unref(r);
1360
1361     avahi_server_add_text_strlst(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, svc_name, strlst);
1362
1363     snprintf(enum_ptr, sizeof(enum_ptr), "_services._dns-sd._udp.%s", domain);
1364     avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, enum_ptr, ptr_name);
1365 }
1366
1367 void avahi_server_add_service_va(
1368     AvahiServer *s,
1369     AvahiEntryGroup *g,
1370     gint interface,
1371     guchar protocol,
1372     const gchar *type,
1373     const gchar *name,
1374     const gchar *domain,
1375     const gchar *host,
1376     guint16 port,
1377     va_list va){
1378
1379     g_assert(s);
1380     g_assert(type);
1381     g_assert(name);
1382
1383     avahi_server_add_service_strlst(s, g, interface, protocol, type, name, domain, host, port, avahi_string_list_new_va(va));
1384 }
1385
1386 void avahi_server_add_service(
1387     AvahiServer *s,
1388     AvahiEntryGroup *g,
1389     gint interface,
1390     guchar protocol,
1391     const gchar *type,
1392     const gchar *name,
1393     const gchar *domain,
1394     const gchar *host,
1395     guint16 port,
1396     ... ){
1397
1398     va_list va;
1399
1400     g_assert(s);
1401     g_assert(type);
1402     g_assert(name);
1403
1404     va_start(va, port);
1405     avahi_server_add_service_va(s, g, interface, protocol, type, name, domain, host, port, va);
1406     va_end(va);
1407 }
1408
1409 static void post_query_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
1410     AvahiKey *k = userdata;
1411
1412     g_assert(m);
1413     g_assert(i);
1414     g_assert(k);
1415
1416     avahi_interface_post_query(i, k, FALSE);
1417 }
1418
1419 void avahi_server_post_query(AvahiServer *s, gint interface, guchar protocol, AvahiKey *key) {
1420     g_assert(s);
1421     g_assert(key);
1422
1423     avahi_interface_monitor_walk(s->monitor, interface, protocol, post_query_callback, key);
1424 }
1425
1426 void avahi_entry_group_change_state(AvahiEntryGroup *g, AvahiEntryGroupState state) {
1427     g_assert(g);
1428
1429     if (g->state == state)
1430         return;
1431
1432     g->state = state;
1433
1434     if (g->callback) {
1435         g->callback(g->server, g, state, g->userdata);
1436         return;
1437     }
1438 }
1439
1440 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata) {
1441     AvahiEntryGroup *g;
1442
1443     g_assert(s);
1444
1445     g = g_new(AvahiEntryGroup, 1);
1446     g->server = s;
1447     g->callback = callback;
1448     g->userdata = userdata;
1449     g->dead = FALSE;
1450     g->state = AVAHI_ENTRY_GROUP_UNCOMMITED;
1451     g->n_probing = 0;
1452     AVAHI_LLIST_HEAD_INIT(AvahiEntry, g->entries);
1453
1454     AVAHI_LLIST_PREPEND(AvahiEntryGroup, groups, s->groups, g);
1455     return g;
1456 }
1457
1458 void avahi_entry_group_free(AvahiEntryGroup *g) {
1459     AvahiEntry *e;
1460
1461     g_assert(g);
1462     g_assert(g->server);
1463
1464     for (e = g->entries; e; e = e->by_group_next) {
1465         avahi_goodbye_entry(g->server, e, TRUE);
1466         e->dead = TRUE;
1467     }
1468
1469     g->dead = TRUE;
1470
1471     g->server->need_group_cleanup = TRUE;
1472     g->server->need_entry_cleanup = TRUE;
1473 }
1474
1475 void avahi_entry_group_commit(AvahiEntryGroup *g) {
1476     g_assert(g);
1477     g_assert(!g->dead);
1478
1479     if (g->state != AVAHI_ENTRY_GROUP_UNCOMMITED)
1480         return;
1481
1482     avahi_entry_group_change_state(g, AVAHI_ENTRY_GROUP_REGISTERING);
1483     avahi_announce_group(g->server, g);
1484     avahi_entry_group_check_probed(g, FALSE);
1485 }
1486
1487 gboolean avahi_entry_commited(AvahiEntry *e) {
1488     g_assert(e);
1489     g_assert(!e->dead);
1490
1491     return !e->group ||
1492         e->group->state == AVAHI_ENTRY_GROUP_REGISTERING ||
1493         e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED;
1494 }
1495
1496 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g) {
1497     g_assert(g);
1498     g_assert(!g->dead);
1499
1500     return g->state;
1501 }
1502
1503 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata) {
1504     g_assert(g);
1505
1506     g->userdata = userdata;
1507 }
1508
1509 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g) {
1510     g_assert(g);
1511
1512     return g->userdata;
1513 }
1514
1515 const gchar* avahi_server_get_domain_name(AvahiServer *s) {
1516     g_assert(s);
1517
1518     return s->domain_name;
1519 }
1520
1521 const gchar* avahi_server_get_host_name(AvahiServer *s) {
1522     g_assert(s);
1523
1524     return s->host_name;
1525 }
1526
1527 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s) {
1528     g_assert(s);
1529
1530     return s->host_name_fqdn;
1531 }
1532
1533 gpointer avahi_server_get_data(AvahiServer *s) {
1534     g_assert(s);
1535
1536     return s->userdata;
1537 }
1538
1539 void avahi_server_set_data(AvahiServer *s, gpointer userdata) {
1540     g_assert(s);
1541
1542     s->userdata = userdata;
1543 }
1544
1545 AvahiServerState avahi_server_get_state(AvahiServer *s) {
1546     g_assert(s);
1547
1548     return s->state;
1549 }
1550
1551 AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
1552     g_assert(c);
1553
1554     memset(c, 0, sizeof(AvahiServerConfig));
1555     c->register_hinfo = TRUE;
1556     c->register_addresses = TRUE;
1557     c->use_ipv6 = TRUE;
1558     c->use_ipv4 = TRUE;
1559     c->host_name = NULL;
1560     c->domain_name = NULL;
1561     c->check_response_ttl = TRUE;
1562     c->announce_domain = TRUE;
1563     c->use_iff_running = FALSE;
1564     c->enable_reflector = FALSE;
1565
1566     return c;
1567 }
1568
1569 void avahi_server_config_free(AvahiServerConfig *c) {
1570     g_assert(c);
1571
1572     g_free(c->host_name);
1573     g_free(c->domain_name);
1574 }
1575
1576 AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
1577     g_assert(ret);
1578     g_assert(c);
1579
1580     *ret = *c;
1581
1582     ret->host_name = g_strdup(c->host_name);
1583     ret->domain_name = g_strdup(c->domain_name);
1584
1585     return ret;
1586 }