4 This file is part of avahi.
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.
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.
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
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <arpa/inet.h>
33 #include <avahi-common/domain.h>
34 #include <avahi-common/malloc.h>
35 #include <avahi-common/defs.h>
41 #include "domain-util.h"
43 #include "addr-util.h"
45 AvahiKey *avahi_key_new(const char *name, uint16_t class, uint16_t type) {
49 if (!(k = avahi_new(AvahiKey, 1))) {
50 avahi_log_error("avahi_new() failed.");
54 if (!(k->name = avahi_normalize_name_strdup(name))) {
55 avahi_log_error("avahi_normalize_name() failed.");
67 AvahiKey *avahi_key_new_cname(AvahiKey *key) {
70 if (key->clazz != AVAHI_DNS_CLASS_IN)
73 if (key->type == AVAHI_DNS_TYPE_CNAME)
76 return avahi_key_new(key->name, key->clazz, AVAHI_DNS_TYPE_CNAME);
79 AvahiKey *avahi_key_ref(AvahiKey *k) {
88 void avahi_key_unref(AvahiKey *k) {
92 if ((--k->ref) <= 0) {
98 AvahiRecord *avahi_record_new(AvahiKey *k, uint32_t ttl) {
103 if (!(r = avahi_new(AvahiRecord, 1))) {
104 avahi_log_error("avahi_new() failed.");
109 r->key = avahi_key_ref(k);
111 memset(&r->data, 0, sizeof(r->data));
113 r->ttl = ttl != (uint32_t) -1 ? ttl : AVAHI_DEFAULT_TTL;
118 AvahiRecord *avahi_record_new_full(const char *name, uint16_t class, uint16_t type, uint32_t ttl) {
124 if (!(k = avahi_key_new(name, class, type))) {
125 avahi_log_error("avahi_key_new() failed.");
129 r = avahi_record_new(k, ttl);
133 avahi_log_error("avahi_record_new() failed.");
140 AvahiRecord *avahi_record_ref(AvahiRecord *r) {
148 void avahi_record_unref(AvahiRecord *r) {
152 if ((--r->ref) <= 0) {
153 switch (r->key->type) {
155 case AVAHI_DNS_TYPE_SRV:
156 avahi_free(r->data.srv.name);
159 case AVAHI_DNS_TYPE_PTR:
160 case AVAHI_DNS_TYPE_CNAME:
161 case AVAHI_DNS_TYPE_NS:
162 avahi_free(r->data.ptr.name);
165 case AVAHI_DNS_TYPE_HINFO:
166 avahi_free(r->data.hinfo.cpu);
167 avahi_free(r->data.hinfo.os);
170 case AVAHI_DNS_TYPE_TXT:
171 avahi_string_list_free(r->data.txt.string_list);
174 case AVAHI_DNS_TYPE_A:
175 case AVAHI_DNS_TYPE_AAAA:
179 avahi_free(r->data.generic.data);
182 avahi_key_unref(r->key);
187 const char *avahi_dns_class_to_string(uint16_t class) {
188 if (class & AVAHI_DNS_CACHE_FLUSH)
192 case AVAHI_DNS_CLASS_IN:
194 case AVAHI_DNS_CLASS_ANY:
201 const char *avahi_dns_type_to_string(uint16_t type) {
203 case AVAHI_DNS_TYPE_CNAME:
205 case AVAHI_DNS_TYPE_A:
207 case AVAHI_DNS_TYPE_AAAA:
209 case AVAHI_DNS_TYPE_PTR:
211 case AVAHI_DNS_TYPE_HINFO:
213 case AVAHI_DNS_TYPE_TXT:
215 case AVAHI_DNS_TYPE_SRV:
217 case AVAHI_DNS_TYPE_ANY:
219 case AVAHI_DNS_TYPE_SOA:
221 case AVAHI_DNS_TYPE_NS:
228 char *avahi_key_to_string(const AvahiKey *k) {
229 char class[16], type[16];
235 /* According to RFC3597 */
237 if (!(c = avahi_dns_class_to_string(k->clazz))) {
238 snprintf(class, sizeof(class), "CLASS%u", k->clazz);
242 if (!(t = avahi_dns_type_to_string(k->type))) {
243 snprintf(type, sizeof(type), "TYPE%u", k->type);
247 return avahi_strdup_printf("%s\t%s\t%s", k->name, c, t);
250 char *avahi_record_to_string(const AvahiRecord *r) {
252 char buf[1024], *t = NULL, *d = NULL;
257 switch (r->key->type) {
258 case AVAHI_DNS_TYPE_A:
259 inet_ntop(AF_INET, &r->data.a.address.address, t = buf, sizeof(buf));
262 case AVAHI_DNS_TYPE_AAAA:
263 inet_ntop(AF_INET6, &r->data.aaaa.address.address, t = buf, sizeof(buf));
266 case AVAHI_DNS_TYPE_PTR:
267 case AVAHI_DNS_TYPE_CNAME:
268 case AVAHI_DNS_TYPE_NS:
270 t = r->data.ptr.name;
273 case AVAHI_DNS_TYPE_TXT:
274 t = d = avahi_string_list_to_string(r->data.txt.string_list);
277 case AVAHI_DNS_TYPE_HINFO:
279 snprintf(t = buf, sizeof(buf), "\"%s\" \"%s\"", r->data.hinfo.cpu, r->data.hinfo.os);
282 case AVAHI_DNS_TYPE_SRV:
284 snprintf(t = buf, sizeof(buf), "%u %u %u %s",
285 r->data.srv.priority,
299 /* According to RFC3597 */
301 snprintf(t = buf, sizeof(buf), "\\# %u", r->data.generic.size);
305 for (c = r->data.generic.data, n = r->data.generic.size, i = 0;
309 sprintf(e, " %02X", *c);
317 p = avahi_key_to_string(r->key);
318 s = avahi_strdup_printf("%s %s ; ttl=%u", p, t, r->ttl);
325 int avahi_key_equal(const AvahiKey *a, const AvahiKey *b) {
332 return avahi_domain_equal(a->name, b->name) &&
333 a->type == b->type &&
334 a->clazz == b->clazz;
337 int avahi_key_pattern_match(const AvahiKey *pattern, const AvahiKey *k) {
341 assert(!avahi_key_is_pattern(k));
346 return avahi_domain_equal(pattern->name, k->name) &&
347 (pattern->type == k->type || pattern->type == AVAHI_DNS_TYPE_ANY) &&
348 (pattern->clazz == k->clazz || pattern->clazz == AVAHI_DNS_CLASS_ANY);
351 int avahi_key_is_pattern(const AvahiKey *k) {
355 k->type == AVAHI_DNS_TYPE_ANY ||
356 k->clazz == AVAHI_DNS_CLASS_ANY;
359 unsigned avahi_key_hash(const AvahiKey *k) {
363 avahi_domain_hash(k->name) +
368 static int rdata_equal(const AvahiRecord *a, const AvahiRecord *b) {
371 assert(a->key->type == b->key->type);
373 switch (a->key->type) {
374 case AVAHI_DNS_TYPE_SRV:
376 a->data.srv.priority == b->data.srv.priority &&
377 a->data.srv.weight == b->data.srv.weight &&
378 a->data.srv.port == b->data.srv.port &&
379 avahi_domain_equal(a->data.srv.name, b->data.srv.name);
381 case AVAHI_DNS_TYPE_PTR:
382 case AVAHI_DNS_TYPE_CNAME:
383 case AVAHI_DNS_TYPE_NS:
384 return avahi_domain_equal(a->data.ptr.name, b->data.ptr.name);
386 case AVAHI_DNS_TYPE_HINFO:
388 !strcmp(a->data.hinfo.cpu, b->data.hinfo.cpu) &&
389 !strcmp(a->data.hinfo.os, b->data.hinfo.os);
391 case AVAHI_DNS_TYPE_TXT:
392 return avahi_string_list_equal(a->data.txt.string_list, b->data.txt.string_list);
394 case AVAHI_DNS_TYPE_A:
395 return memcmp(&a->data.a.address, &b->data.a.address, sizeof(AvahiIPv4Address)) == 0;
397 case AVAHI_DNS_TYPE_AAAA:
398 return memcmp(&a->data.aaaa.address, &b->data.aaaa.address, sizeof(AvahiIPv6Address)) == 0;
401 return a->data.generic.size == b->data.generic.size &&
402 (a->data.generic.size == 0 || memcmp(a->data.generic.data, b->data.generic.data, a->data.generic.size) == 0);
407 int avahi_record_equal_no_ttl(const AvahiRecord *a, const AvahiRecord *b) {
415 avahi_key_equal(a->key, b->key) &&
420 AvahiRecord *avahi_record_copy(AvahiRecord *r) {
423 if (!(copy = avahi_new(AvahiRecord, 1))) {
424 avahi_log_error("avahi_new() failed.");
429 copy->key = avahi_key_ref(r->key);
432 switch (r->key->type) {
433 case AVAHI_DNS_TYPE_PTR:
434 case AVAHI_DNS_TYPE_CNAME:
435 case AVAHI_DNS_TYPE_NS:
436 if (!(copy->data.ptr.name = avahi_strdup(r->data.ptr.name)))
440 case AVAHI_DNS_TYPE_SRV:
441 copy->data.srv.priority = r->data.srv.priority;
442 copy->data.srv.weight = r->data.srv.weight;
443 copy->data.srv.port = r->data.srv.port;
444 if (!(copy->data.srv.name = avahi_strdup(r->data.srv.name)))
448 case AVAHI_DNS_TYPE_HINFO:
449 if (!(copy->data.hinfo.os = avahi_strdup(r->data.hinfo.os)))
452 if (!(copy->data.hinfo.cpu = avahi_strdup(r->data.hinfo.cpu))) {
453 avahi_free(r->data.hinfo.os);
458 case AVAHI_DNS_TYPE_TXT:
459 copy->data.txt.string_list = avahi_string_list_copy(r->data.txt.string_list);
462 case AVAHI_DNS_TYPE_A:
463 copy->data.a.address = r->data.a.address;
466 case AVAHI_DNS_TYPE_AAAA:
467 copy->data.aaaa.address = r->data.aaaa.address;
471 if (!(copy->data.generic.data = avahi_memdup(r->data.generic.data, r->data.generic.size)))
473 copy->data.generic.size = r->data.generic.size;
481 avahi_log_error("Failed to allocate memory");
483 avahi_key_unref(copy->key);
490 size_t avahi_key_get_estimate_size(AvahiKey *k) {
493 return strlen(k->name)+1+4;
496 size_t avahi_record_get_estimate_size(AvahiRecord *r) {
500 n = avahi_key_get_estimate_size(r->key) + 4 + 2;
502 switch (r->key->type) {
503 case AVAHI_DNS_TYPE_PTR:
504 case AVAHI_DNS_TYPE_CNAME:
505 case AVAHI_DNS_TYPE_NS:
506 n += strlen(r->data.ptr.name) + 1;
509 case AVAHI_DNS_TYPE_SRV:
510 n += 6 + strlen(r->data.srv.name) + 1;
513 case AVAHI_DNS_TYPE_HINFO:
514 n += strlen(r->data.hinfo.os) + 1 + strlen(r->data.hinfo.cpu) + 1;
517 case AVAHI_DNS_TYPE_TXT:
518 n += avahi_string_list_serialize(r->data.txt.string_list, NULL, 0);
521 case AVAHI_DNS_TYPE_A:
522 n += sizeof(AvahiIPv4Address);
525 case AVAHI_DNS_TYPE_AAAA:
526 n += sizeof(AvahiIPv6Address);
530 n += r->data.generic.size;
536 static int lexicographical_memcmp(const void* a, size_t al, const void* b, size_t bl) {
543 c = al < bl ? al : bl;
544 if ((ret = memcmp(a, b, c)))
550 return al == c ? 1 : -1;
553 static int uint16_cmp(uint16_t a, uint16_t b) {
554 return a == b ? 0 : (a < b ? -1 : 1);
557 int avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
564 /* t1 = avahi_record_to_string(a); */
565 /* t2 = avahi_record_to_string(b); */
566 /* g_message("lexicocmp: %s %s", t1, t2); */
567 /* avahi_free(t1); */
568 /* avahi_free(t2); */
573 if ((r = uint16_cmp(a->key->clazz, b->key->clazz)) ||
574 (r = uint16_cmp(a->key->type, b->key->type)))
577 switch (a->key->type) {
579 case AVAHI_DNS_TYPE_PTR:
580 case AVAHI_DNS_TYPE_CNAME:
581 case AVAHI_DNS_TYPE_NS:
582 return avahi_binary_domain_cmp(a->data.ptr.name, b->data.ptr.name);
584 case AVAHI_DNS_TYPE_SRV: {
585 if ((r = uint16_cmp(a->data.srv.priority, b->data.srv.priority)) == 0 &&
586 (r = uint16_cmp(a->data.srv.weight, b->data.srv.weight)) == 0 &&
587 (r = uint16_cmp(a->data.srv.port, b->data.srv.port)) == 0)
588 r = avahi_binary_domain_cmp(a->data.srv.name, b->data.srv.name);
593 case AVAHI_DNS_TYPE_HINFO: {
595 if ((r = strcmp(a->data.hinfo.cpu, b->data.hinfo.cpu)) ||
596 (r = strcmp(a->data.hinfo.os, b->data.hinfo.os)))
603 case AVAHI_DNS_TYPE_TXT: {
605 uint8_t *ma = NULL, *mb = NULL;
608 asize = avahi_string_list_serialize(a->data.txt.string_list, NULL, 0);
609 bsize = avahi_string_list_serialize(b->data.txt.string_list, NULL, 0);
611 if (asize > 0 && !(ma = avahi_new(uint8_t, asize)))
614 if (bsize > 0 && !(mb = avahi_new(uint8_t, bsize))) {
619 avahi_string_list_serialize(a->data.txt.string_list, ma, asize);
620 avahi_string_list_serialize(b->data.txt.string_list, mb, bsize);
623 r = lexicographical_memcmp(ma, asize, mb, bsize);
624 else if (asize && !bsize)
626 else if (!asize && bsize)
637 case AVAHI_DNS_TYPE_A:
638 return memcmp(&a->data.a.address, &b->data.a.address, sizeof(AvahiIPv4Address));
640 case AVAHI_DNS_TYPE_AAAA:
641 return memcmp(&a->data.aaaa.address, &b->data.aaaa.address, sizeof(AvahiIPv6Address));
644 return lexicographical_memcmp(a->data.generic.data, a->data.generic.size,
645 b->data.generic.data, b->data.generic.size);
650 avahi_log_error(__FILE__": Out of memory");
651 return -1; /* or whatever ... */
654 int avahi_record_is_goodbye(AvahiRecord *r) {
660 int avahi_key_is_valid(AvahiKey *k) {
663 if (!avahi_is_valid_domain_name(k->name))
669 int avahi_record_is_valid(AvahiRecord *r) {
672 if (!avahi_key_is_valid(r->key))
675 switch (r->key->type) {
677 case AVAHI_DNS_TYPE_PTR:
678 case AVAHI_DNS_TYPE_CNAME:
679 case AVAHI_DNS_TYPE_NS:
680 return avahi_is_valid_domain_name(r->data.ptr.name);
682 case AVAHI_DNS_TYPE_SRV:
683 return avahi_is_valid_domain_name(r->data.srv.name);
685 case AVAHI_DNS_TYPE_HINFO:
687 strlen(r->data.hinfo.os) <= 255 &&
688 strlen(r->data.hinfo.cpu) <= 255;
690 case AVAHI_DNS_TYPE_TXT: {
692 AvahiStringList *strlst;
694 for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next)
695 if (strlst->size > 255 || strlst->size <= 0)
705 static AvahiAddress *get_address(const AvahiRecord *r, AvahiAddress *a) {
708 switch (r->key->type) {
709 case AVAHI_DNS_TYPE_A:
710 a->proto = AVAHI_PROTO_INET;
711 a->data.ipv4 = r->data.a.address;
714 case AVAHI_DNS_TYPE_AAAA:
715 a->proto = AVAHI_PROTO_INET6;
716 a->data.ipv6 = r->data.aaaa.address;
726 int avahi_record_is_link_local_address(const AvahiRecord *r) {
731 if (!get_address(r, &a))
734 return avahi_address_is_link_local(&a);