2 This file is part of avahi.
4 avahi is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
9 avahi is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12 Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with avahi; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <arpa/inet.h>
31 #include <avahi-common/domain.h>
32 #include <avahi-common/malloc.h>
33 #include <avahi-common/defs.h>
39 #include "domain-util.h"
41 #include "addr-util.h"
43 AvahiKey *avahi_key_new(const char *name, uint16_t class, uint16_t type) {
47 if (!(k = avahi_new(AvahiKey, 1))) {
48 avahi_log_error("avahi_new() failed.");
52 if (!(k->name = avahi_normalize_name_strdup(name))) {
53 avahi_log_error("avahi_normalize_name() failed.");
65 AvahiKey *avahi_key_new_cname(AvahiKey *key) {
68 if (key->clazz != AVAHI_DNS_CLASS_IN)
71 if (key->type == AVAHI_DNS_TYPE_CNAME)
74 return avahi_key_new(key->name, key->clazz, AVAHI_DNS_TYPE_CNAME);
77 AvahiKey *avahi_key_ref(AvahiKey *k) {
86 void avahi_key_unref(AvahiKey *k) {
90 if ((--k->ref) <= 0) {
96 AvahiRecord *avahi_record_new(AvahiKey *k, uint32_t ttl) {
101 if (!(r = avahi_new(AvahiRecord, 1))) {
102 avahi_log_error("avahi_new() failed.");
107 r->key = avahi_key_ref(k);
109 memset(&r->data, 0, sizeof(r->data));
111 r->ttl = ttl != (uint32_t) -1 ? ttl : AVAHI_DEFAULT_TTL;
116 AvahiRecord *avahi_record_new_full(const char *name, uint16_t class, uint16_t type, uint32_t ttl) {
122 if (!(k = avahi_key_new(name, class, type))) {
123 avahi_log_error("avahi_key_new() failed.");
127 r = avahi_record_new(k, ttl);
131 avahi_log_error("avahi_record_new() failed.");
138 AvahiRecord *avahi_record_ref(AvahiRecord *r) {
146 void avahi_record_unref(AvahiRecord *r) {
150 if ((--r->ref) <= 0) {
151 switch (r->key->type) {
153 case AVAHI_DNS_TYPE_SRV:
154 avahi_free(r->data.srv.name);
157 case AVAHI_DNS_TYPE_PTR:
158 case AVAHI_DNS_TYPE_CNAME:
159 case AVAHI_DNS_TYPE_NS:
160 avahi_free(r->data.ptr.name);
163 case AVAHI_DNS_TYPE_HINFO:
164 avahi_free(r->data.hinfo.cpu);
165 avahi_free(r->data.hinfo.os);
168 case AVAHI_DNS_TYPE_TXT:
169 avahi_string_list_free(r->data.txt.string_list);
172 case AVAHI_DNS_TYPE_A:
173 case AVAHI_DNS_TYPE_AAAA:
177 avahi_free(r->data.generic.data);
180 avahi_key_unref(r->key);
185 const char *avahi_dns_class_to_string(uint16_t class) {
186 if (class & AVAHI_DNS_CACHE_FLUSH)
190 case AVAHI_DNS_CLASS_IN:
192 case AVAHI_DNS_CLASS_ANY:
199 const char *avahi_dns_type_to_string(uint16_t type) {
201 case AVAHI_DNS_TYPE_CNAME:
203 case AVAHI_DNS_TYPE_A:
205 case AVAHI_DNS_TYPE_AAAA:
207 case AVAHI_DNS_TYPE_PTR:
209 case AVAHI_DNS_TYPE_HINFO:
211 case AVAHI_DNS_TYPE_TXT:
213 case AVAHI_DNS_TYPE_SRV:
215 case AVAHI_DNS_TYPE_ANY:
217 case AVAHI_DNS_TYPE_SOA:
219 case AVAHI_DNS_TYPE_NS:
226 char *avahi_key_to_string(const AvahiKey *k) {
227 char class[16], type[16];
233 /* According to RFC3597 */
235 if (!(c = avahi_dns_class_to_string(k->clazz))) {
236 snprintf(class, sizeof(class), "CLASS%u", k->clazz);
240 if (!(t = avahi_dns_type_to_string(k->type))) {
241 snprintf(type, sizeof(type), "TYPE%u", k->type);
245 return avahi_strdup_printf("%s\t%s\t%s", k->name, c, t);
248 char *avahi_record_to_string(const AvahiRecord *r) {
250 char buf[1024], *t = NULL, *d = NULL;
255 switch (r->key->type) {
256 case AVAHI_DNS_TYPE_A:
257 inet_ntop(AF_INET, &r->data.a.address.address, t = buf, sizeof(buf));
260 case AVAHI_DNS_TYPE_AAAA:
261 inet_ntop(AF_INET6, &r->data.aaaa.address.address, t = buf, sizeof(buf));
264 case AVAHI_DNS_TYPE_PTR:
265 case AVAHI_DNS_TYPE_CNAME:
266 case AVAHI_DNS_TYPE_NS:
268 t = r->data.ptr.name;
271 case AVAHI_DNS_TYPE_TXT:
272 t = d = avahi_string_list_to_string(r->data.txt.string_list);
275 case AVAHI_DNS_TYPE_HINFO:
277 snprintf(t = buf, sizeof(buf), "\"%s\" \"%s\"", r->data.hinfo.cpu, r->data.hinfo.os);
280 case AVAHI_DNS_TYPE_SRV:
282 snprintf(t = buf, sizeof(buf), "%u %u %u %s",
283 r->data.srv.priority,
297 /* According to RFC3597 */
299 snprintf(t = buf, sizeof(buf), "\\# %u", r->data.generic.size);
303 for (c = r->data.generic.data, n = r->data.generic.size, i = 0;
307 sprintf(e, " %02X", *c);
315 p = avahi_key_to_string(r->key);
316 s = avahi_strdup_printf("%s %s ; ttl=%u", p, t, r->ttl);
323 int avahi_key_equal(const AvahiKey *a, const AvahiKey *b) {
330 return avahi_domain_equal(a->name, b->name) &&
331 a->type == b->type &&
332 a->clazz == b->clazz;
335 int avahi_key_pattern_match(const AvahiKey *pattern, const AvahiKey *k) {
339 assert(!avahi_key_is_pattern(k));
344 return avahi_domain_equal(pattern->name, k->name) &&
345 (pattern->type == k->type || pattern->type == AVAHI_DNS_TYPE_ANY) &&
346 (pattern->clazz == k->clazz || pattern->clazz == AVAHI_DNS_CLASS_ANY);
349 int avahi_key_is_pattern(const AvahiKey *k) {
353 k->type == AVAHI_DNS_TYPE_ANY ||
354 k->clazz == AVAHI_DNS_CLASS_ANY;
357 unsigned avahi_key_hash(const AvahiKey *k) {
361 avahi_domain_hash(k->name) +
366 static int rdata_equal(const AvahiRecord *a, const AvahiRecord *b) {
369 assert(a->key->type == b->key->type);
371 switch (a->key->type) {
372 case AVAHI_DNS_TYPE_SRV:
374 a->data.srv.priority == b->data.srv.priority &&
375 a->data.srv.weight == b->data.srv.weight &&
376 a->data.srv.port == b->data.srv.port &&
377 avahi_domain_equal(a->data.srv.name, b->data.srv.name);
379 case AVAHI_DNS_TYPE_PTR:
380 case AVAHI_DNS_TYPE_CNAME:
381 case AVAHI_DNS_TYPE_NS:
382 return avahi_domain_equal(a->data.ptr.name, b->data.ptr.name);
384 case AVAHI_DNS_TYPE_HINFO:
386 !strcmp(a->data.hinfo.cpu, b->data.hinfo.cpu) &&
387 !strcmp(a->data.hinfo.os, b->data.hinfo.os);
389 case AVAHI_DNS_TYPE_TXT:
390 return avahi_string_list_equal(a->data.txt.string_list, b->data.txt.string_list);
392 case AVAHI_DNS_TYPE_A:
393 return memcmp(&a->data.a.address, &b->data.a.address, sizeof(AvahiIPv4Address)) == 0;
395 case AVAHI_DNS_TYPE_AAAA:
396 return memcmp(&a->data.aaaa.address, &b->data.aaaa.address, sizeof(AvahiIPv6Address)) == 0;
399 return a->data.generic.size == b->data.generic.size &&
400 (a->data.generic.size == 0 || memcmp(a->data.generic.data, b->data.generic.data, a->data.generic.size) == 0);
405 int avahi_record_equal_no_ttl(const AvahiRecord *a, const AvahiRecord *b) {
413 avahi_key_equal(a->key, b->key) &&
418 AvahiRecord *avahi_record_copy(AvahiRecord *r) {
421 if (!(copy = avahi_new(AvahiRecord, 1))) {
422 avahi_log_error("avahi_new() failed.");
427 copy->key = avahi_key_ref(r->key);
430 switch (r->key->type) {
431 case AVAHI_DNS_TYPE_PTR:
432 case AVAHI_DNS_TYPE_CNAME:
433 case AVAHI_DNS_TYPE_NS:
434 if (!(copy->data.ptr.name = avahi_strdup(r->data.ptr.name)))
438 case AVAHI_DNS_TYPE_SRV:
439 copy->data.srv.priority = r->data.srv.priority;
440 copy->data.srv.weight = r->data.srv.weight;
441 copy->data.srv.port = r->data.srv.port;
442 if (!(copy->data.srv.name = avahi_strdup(r->data.srv.name)))
446 case AVAHI_DNS_TYPE_HINFO:
447 if (!(copy->data.hinfo.os = avahi_strdup(r->data.hinfo.os)))
450 if (!(copy->data.hinfo.cpu = avahi_strdup(r->data.hinfo.cpu))) {
451 avahi_free(r->data.hinfo.os);
456 case AVAHI_DNS_TYPE_TXT:
457 copy->data.txt.string_list = avahi_string_list_copy(r->data.txt.string_list);
460 case AVAHI_DNS_TYPE_A:
461 copy->data.a.address = r->data.a.address;
464 case AVAHI_DNS_TYPE_AAAA:
465 copy->data.aaaa.address = r->data.aaaa.address;
469 if (!(copy->data.generic.data = avahi_memdup(r->data.generic.data, r->data.generic.size)))
471 copy->data.generic.size = r->data.generic.size;
479 avahi_log_error("Failed to allocate memory");
481 avahi_key_unref(copy->key);
488 size_t avahi_key_get_estimate_size(AvahiKey *k) {
491 return strlen(k->name)+1+4;
494 size_t avahi_record_get_estimate_size(AvahiRecord *r) {
498 n = avahi_key_get_estimate_size(r->key) + 4 + 2;
500 switch (r->key->type) {
501 case AVAHI_DNS_TYPE_PTR:
502 case AVAHI_DNS_TYPE_CNAME:
503 case AVAHI_DNS_TYPE_NS:
504 n += strlen(r->data.ptr.name) + 1;
507 case AVAHI_DNS_TYPE_SRV:
508 n += 6 + strlen(r->data.srv.name) + 1;
511 case AVAHI_DNS_TYPE_HINFO:
512 n += strlen(r->data.hinfo.os) + 1 + strlen(r->data.hinfo.cpu) + 1;
515 case AVAHI_DNS_TYPE_TXT:
516 n += avahi_string_list_serialize(r->data.txt.string_list, NULL, 0);
519 case AVAHI_DNS_TYPE_A:
520 n += sizeof(AvahiIPv4Address);
523 case AVAHI_DNS_TYPE_AAAA:
524 n += sizeof(AvahiIPv6Address);
528 n += r->data.generic.size;
534 static int lexicographical_memcmp(const void* a, size_t al, const void* b, size_t bl) {
541 c = al < bl ? al : bl;
542 if ((ret = memcmp(a, b, c)))
548 return al == c ? 1 : -1;
551 static int uint16_cmp(uint16_t a, uint16_t b) {
552 return a == b ? 0 : (a < b ? -1 : 1);
555 int avahi_record_lexicographical_compare(AvahiRecord *a, AvahiRecord *b) {
562 /* t1 = avahi_record_to_string(a); */
563 /* t2 = avahi_record_to_string(b); */
564 /* g_message("lexicocmp: %s %s", t1, t2); */
565 /* avahi_free(t1); */
566 /* avahi_free(t2); */
571 if ((r = uint16_cmp(a->key->clazz, b->key->clazz)) ||
572 (r = uint16_cmp(a->key->type, b->key->type)))
575 switch (a->key->type) {
577 case AVAHI_DNS_TYPE_PTR:
578 case AVAHI_DNS_TYPE_CNAME:
579 case AVAHI_DNS_TYPE_NS:
580 return avahi_binary_domain_cmp(a->data.ptr.name, b->data.ptr.name);
582 case AVAHI_DNS_TYPE_SRV: {
583 if ((r = uint16_cmp(a->data.srv.priority, b->data.srv.priority)) == 0 &&
584 (r = uint16_cmp(a->data.srv.weight, b->data.srv.weight)) == 0 &&
585 (r = uint16_cmp(a->data.srv.port, b->data.srv.port)) == 0)
586 r = avahi_binary_domain_cmp(a->data.srv.name, b->data.srv.name);
591 case AVAHI_DNS_TYPE_HINFO: {
593 if ((r = strcmp(a->data.hinfo.cpu, b->data.hinfo.cpu)) ||
594 (r = strcmp(a->data.hinfo.os, b->data.hinfo.os)))
601 case AVAHI_DNS_TYPE_TXT: {
603 uint8_t *ma = NULL, *mb = NULL;
606 asize = avahi_string_list_serialize(a->data.txt.string_list, NULL, 0);
607 bsize = avahi_string_list_serialize(b->data.txt.string_list, NULL, 0);
609 if (asize > 0 && !(ma = avahi_new(uint8_t, asize)))
612 if (bsize > 0 && !(mb = avahi_new(uint8_t, bsize))) {
617 avahi_string_list_serialize(a->data.txt.string_list, ma, asize);
618 avahi_string_list_serialize(b->data.txt.string_list, mb, bsize);
621 r = lexicographical_memcmp(ma, asize, mb, bsize);
622 else if (asize && !bsize)
624 else if (!asize && bsize)
635 case AVAHI_DNS_TYPE_A:
636 return memcmp(&a->data.a.address, &b->data.a.address, sizeof(AvahiIPv4Address));
638 case AVAHI_DNS_TYPE_AAAA:
639 return memcmp(&a->data.aaaa.address, &b->data.aaaa.address, sizeof(AvahiIPv6Address));
642 return lexicographical_memcmp(a->data.generic.data, a->data.generic.size,
643 b->data.generic.data, b->data.generic.size);
648 avahi_log_error(__FILE__": Out of memory");
649 return -1; /* or whatever ... */
652 int avahi_record_is_goodbye(AvahiRecord *r) {
658 int avahi_key_is_valid(AvahiKey *k) {
661 if (!avahi_is_valid_domain_name(k->name))
667 int avahi_record_is_valid(AvahiRecord *r) {
670 if (!avahi_key_is_valid(r->key))
673 switch (r->key->type) {
675 case AVAHI_DNS_TYPE_PTR:
676 case AVAHI_DNS_TYPE_CNAME:
677 case AVAHI_DNS_TYPE_NS:
678 return avahi_is_valid_domain_name(r->data.ptr.name);
680 case AVAHI_DNS_TYPE_SRV:
681 return avahi_is_valid_domain_name(r->data.srv.name);
683 case AVAHI_DNS_TYPE_HINFO:
685 strlen(r->data.hinfo.os) <= 255 &&
686 strlen(r->data.hinfo.cpu) <= 255;
688 case AVAHI_DNS_TYPE_TXT: {
690 AvahiStringList *strlst;
692 for (strlst = r->data.txt.string_list; strlst; strlst = strlst->next)
693 if (strlst->size > 255 || strlst->size <= 0)
703 static AvahiAddress *get_address(const AvahiRecord *r, AvahiAddress *a) {
706 switch (r->key->type) {
707 case AVAHI_DNS_TYPE_A:
708 a->proto = AVAHI_PROTO_INET;
709 a->data.ipv4 = r->data.a.address;
712 case AVAHI_DNS_TYPE_AAAA:
713 a->proto = AVAHI_PROTO_INET6;
714 a->data.ipv6 = r->data.aaaa.address;
724 int avahi_record_is_link_local_address(const AvahiRecord *r) {
729 if (!get_address(r, &a))
732 return avahi_address_is_link_local(&a);