+++ /dev/null
-/***
- This file is part of avahi.
-
- avahi is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- avahi is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
- Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with avahi; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- USA.
-***/
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <assert.h>
-
-#include <sys/types.h>
-#include <netinet/in.h>
-
-#include <avahi-common/defs.h>
-#include <avahi-common/domain.h>
-#include <avahi-common/malloc.h>
-
-#include "dns.h"
-#include "log.h"
-
-AvahiDnsPacket* avahi_dns_packet_new(unsigned mtu) {
- AvahiDnsPacket *p;
- size_t max_size;
-
- if (mtu <= 0)
- max_size = AVAHI_DNS_PACKET_SIZE_MAX;
- else if (mtu >= AVAHI_DNS_PACKET_EXTRA_SIZE)
- max_size = mtu - AVAHI_DNS_PACKET_EXTRA_SIZE;
- else
- max_size = 0;
-
- if (max_size < AVAHI_DNS_PACKET_HEADER_SIZE)
- max_size = AVAHI_DNS_PACKET_HEADER_SIZE;
-
- if (!(p = avahi_malloc(sizeof(AvahiDnsPacket) + max_size)))
- return p;
-
- p->size = p->rindex = AVAHI_DNS_PACKET_HEADER_SIZE;
- p->max_size = max_size;
- p->name_table = NULL;
- p->data = NULL;
-
- memset(AVAHI_DNS_PACKET_DATA(p), 0, p->size);
- return p;
-}
-
-AvahiDnsPacket* avahi_dns_packet_new_query(unsigned mtu) {
- AvahiDnsPacket *p;
-
- if (!(p = avahi_dns_packet_new(mtu)))
- return NULL;
-
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_FLAGS, AVAHI_DNS_FLAGS(0, 0, 0, 0, 0, 0, 0, 0, 0, 0));
- return p;
-}
-
-AvahiDnsPacket* avahi_dns_packet_new_response(unsigned mtu, int aa) {
- AvahiDnsPacket *p;
-
- if (!(p = avahi_dns_packet_new(mtu)))
- return NULL;
-
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_FLAGS, AVAHI_DNS_FLAGS(1, 0, aa, 0, 0, 0, 0, 0, 0, 0));
- return p;
-}
-
-AvahiDnsPacket* avahi_dns_packet_new_reply(AvahiDnsPacket* p, unsigned mtu, int copy_queries, int aa) {
- AvahiDnsPacket *r;
- assert(p);
-
- if (!(r = avahi_dns_packet_new_response(mtu, aa)))
- return NULL;
-
- if (copy_queries) {
- unsigned saved_rindex;
- uint32_t n;
-
- saved_rindex = p->rindex;
- p->rindex = AVAHI_DNS_PACKET_HEADER_SIZE;
-
- for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n--) {
- AvahiKey *k;
- int unicast_response;
-
- if ((k = avahi_dns_packet_consume_key(p, &unicast_response))) {
- avahi_dns_packet_append_key(r, k, unicast_response);
- avahi_key_unref(k);
- }
- }
-
- p->rindex = saved_rindex;
-
- avahi_dns_packet_set_field(r, AVAHI_DNS_FIELD_QDCOUNT, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT));
- }
-
- avahi_dns_packet_set_field(r, AVAHI_DNS_FIELD_ID, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID));
-
- avahi_dns_packet_set_field(r, AVAHI_DNS_FIELD_FLAGS,
- (avahi_dns_packet_get_field(r, AVAHI_DNS_FIELD_FLAGS) & ~AVAHI_DNS_FLAG_OPCODE) |
- (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_OPCODE));
-
- return r;
-}
-
-
-void avahi_dns_packet_free(AvahiDnsPacket *p) {
- assert(p);
-
- if (p->name_table)
- avahi_hashmap_free(p->name_table);
-
- avahi_free(p);
-}
-
-void avahi_dns_packet_set_field(AvahiDnsPacket *p, unsigned idx, uint16_t v) {
- assert(p);
- assert(idx < AVAHI_DNS_PACKET_HEADER_SIZE);
-
- ((uint16_t*) AVAHI_DNS_PACKET_DATA(p))[idx] = htons(v);
-}
-
-uint16_t avahi_dns_packet_get_field(AvahiDnsPacket *p, unsigned idx) {
- assert(p);
- assert(idx < AVAHI_DNS_PACKET_HEADER_SIZE);
-
- return ntohs(((uint16_t*) AVAHI_DNS_PACKET_DATA(p))[idx]);
-}
-
-void avahi_dns_packet_inc_field(AvahiDnsPacket *p, unsigned idx) {
- assert(p);
- assert(idx < AVAHI_DNS_PACKET_HEADER_SIZE);
-
- avahi_dns_packet_set_field(p, idx, avahi_dns_packet_get_field(p, idx) + 1);
-}
-
-
-static void name_table_cleanup(void *key, void *value, void *user_data) {
- AvahiDnsPacket *p = user_data;
-
- if ((uint8_t*) value >= AVAHI_DNS_PACKET_DATA(p) + p->size)
- avahi_hashmap_remove(p->name_table, key);
-}
-
-void avahi_dns_packet_cleanup_name_table(AvahiDnsPacket *p) {
- if (p->name_table)
- avahi_hashmap_foreach(p->name_table, name_table_cleanup, p);
-}
-
-uint8_t* avahi_dns_packet_append_name(AvahiDnsPacket *p, const char *name) {
- uint8_t *d, *saved_ptr = NULL;
- size_t saved_size;
-
- assert(p);
- assert(name);
-
- saved_size = p->size;
- saved_ptr = avahi_dns_packet_extend(p, 0);
-
- while (*name) {
- uint8_t* prev;
- const char *pname;
- char label[64], *u;
-
- /* Check whether we can compress this name. */
-
- if (p->name_table && (prev = avahi_hashmap_lookup(p->name_table, name))) {
- unsigned idx;
-
- assert(prev >= AVAHI_DNS_PACKET_DATA(p));
- idx = (unsigned) (prev - AVAHI_DNS_PACKET_DATA(p));
-
- assert(idx < p->size);
-
- if (idx < 0x4000) {
- uint8_t *t;
- if (!(t = (uint8_t*) avahi_dns_packet_extend(p, sizeof(uint16_t))))
- return NULL;
-
- t[0] = (uint8_t) ((0xC000 | idx) >> 8);
- t[1] = (uint8_t) idx;
- return saved_ptr;
- }
- }
-
- pname = name;
-
- if (!(avahi_unescape_label(&name, label, sizeof(label))))
- goto fail;
-
- if (!(d = avahi_dns_packet_append_string(p, label)))
- goto fail;
-
- if (!p->name_table)
- /* This works only for normalized domain names */
- p->name_table = avahi_hashmap_new(avahi_string_hash, avahi_string_equal, avahi_free, NULL);
-
- if (!(u = avahi_strdup(pname)))
- avahi_log_error("avahi_strdup() failed.");
- else
- avahi_hashmap_insert(p->name_table, u, d);
- }
-
- if (!(d = avahi_dns_packet_extend(p, 1)))
- goto fail;
-
- *d = 0;
-
- return saved_ptr;
-
-fail:
- p->size = saved_size;
- avahi_dns_packet_cleanup_name_table(p);
-
- return NULL;
-}
-
-uint8_t* avahi_dns_packet_append_uint16(AvahiDnsPacket *p, uint16_t v) {
- uint8_t *d;
- assert(p);
-
- if (!(d = avahi_dns_packet_extend(p, sizeof(uint16_t))))
- return NULL;
-
- d[0] = (uint8_t) (v >> 8);
- d[1] = (uint8_t) v;
- return d;
-}
-
-uint8_t *avahi_dns_packet_append_uint32(AvahiDnsPacket *p, uint32_t v) {
- uint8_t *d;
- assert(p);
-
- if (!(d = avahi_dns_packet_extend(p, sizeof(uint32_t))))
- return NULL;
-
- d[0] = (uint8_t) (v >> 24);
- d[1] = (uint8_t) (v >> 16);
- d[2] = (uint8_t) (v >> 8);
- d[3] = (uint8_t) v;
-
- return d;
-}
-
-uint8_t *avahi_dns_packet_append_bytes(AvahiDnsPacket *p, const void *b, size_t l) {
- uint8_t* d;
-
- assert(p);
- assert(b);
- assert(l);
-
- if (!(d = avahi_dns_packet_extend(p, l)))
- return NULL;
-
- memcpy(d, b, l);
- return d;
-}
-
-uint8_t* avahi_dns_packet_append_string(AvahiDnsPacket *p, const char *s) {
- uint8_t* d;
- size_t k;
-
- assert(p);
- assert(s);
-
- if ((k = strlen(s)) >= 255)
- k = 255;
-
- if (!(d = avahi_dns_packet_extend(p, k+1)))
- return NULL;
-
- *d = (uint8_t) k;
- memcpy(d+1, s, k);
-
- return d;
-}
-
-uint8_t *avahi_dns_packet_extend(AvahiDnsPacket *p, size_t l) {
- uint8_t *d;
-
- assert(p);
-
- if (p->size+l > p->max_size)
- return NULL;
-
- d = AVAHI_DNS_PACKET_DATA(p) + p->size;
- p->size += l;
-
- return d;
-}
-
-int avahi_dns_packet_check_valid(AvahiDnsPacket *p) {
- uint16_t flags;
- assert(p);
-
- if (p->size < AVAHI_DNS_PACKET_HEADER_SIZE)
- return -1;
-
- flags = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS);
-
- if (flags & AVAHI_DNS_FLAG_OPCODE)
- return -1;
-
- return 0;
-}
-
-int avahi_dns_packet_check_valid_multicast(AvahiDnsPacket *p) {
- uint16_t flags;
- assert(p);
-
- if (avahi_dns_packet_check_valid(p) < 0)
- return -1;
-
- flags = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS);
-
- if (flags & AVAHI_DNS_FLAG_RCODE)
- return -1;
-
- return 0;
-}
-
-int avahi_dns_packet_is_query(AvahiDnsPacket *p) {
- assert(p);
-
- return !(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_QR);
-}
-
-static int consume_labels(AvahiDnsPacket *p, unsigned idx, char *ret_name, size_t l) {
- int ret = 0;
- int compressed = 0;
- int first_label = 1;
- unsigned label_ptr;
- int i;
- assert(p && ret_name && l);
-
- for (i = 0; i < AVAHI_DNS_LABELS_MAX; i++) {
- uint8_t n;
-
- if (idx+1 > p->size)
- return -1;
-
- n = AVAHI_DNS_PACKET_DATA(p)[idx];
-
- if (!n) {
- idx++;
- if (!compressed)
- ret++;
-
- if (l < 1)
- return -1;
- *ret_name = 0;
-
- return ret;
-
- } else if (n <= 63) {
- /* Uncompressed label */
- idx++;
- if (!compressed)
- ret++;
-
- if (idx + n > p->size)
- return -1;
-
- if ((size_t) n + 1 > l)
- return -1;
-
- if (!first_label) {
- *(ret_name++) = '.';
- l--;
- } else
- first_label = 0;
-
- if (!(avahi_escape_label((char*) AVAHI_DNS_PACKET_DATA(p) + idx, n, &ret_name, &l)))
- return -1;
-
- idx += n;
-
- if (!compressed)
- ret += n;
- } else if ((n & 0xC0) == 0xC0) {
- /* Compressed label */
-
- if (idx+2 > p->size)
- return -1;
-
- label_ptr = ((unsigned) (AVAHI_DNS_PACKET_DATA(p)[idx] & ~0xC0)) << 8 | AVAHI_DNS_PACKET_DATA(p)[idx+1];
-
- if ((label_ptr < AVAHI_DNS_PACKET_HEADER_SIZE) || (label_ptr >= idx))
- return -1;
-
- idx = label_ptr;
-
- if (!compressed)
- ret += 2;
-
- compressed = 1;
- } else
- return -1;
- }
-
- return -1;
-}
-
-int avahi_dns_packet_consume_name(AvahiDnsPacket *p, char *ret_name, size_t l) {
- int r;
-
- if ((r = consume_labels(p, p->rindex, ret_name, l)) < 0)
- return -1;
-
- p->rindex += r;
- return 0;
-}
-
-int avahi_dns_packet_consume_uint16(AvahiDnsPacket *p, uint16_t *ret_v) {
- uint8_t *d;
-
- assert(p);
- assert(ret_v);
-
- if (p->rindex + sizeof(uint16_t) > p->size)
- return -1;
-
- d = (uint8_t*) (AVAHI_DNS_PACKET_DATA(p) + p->rindex);
- *ret_v = (d[0] << 8) | d[1];
- p->rindex += sizeof(uint16_t);
-
- return 0;
-}
-
-int avahi_dns_packet_consume_uint32(AvahiDnsPacket *p, uint32_t *ret_v) {
- uint8_t* d;
-
- assert(p);
- assert(ret_v);
-
- if (p->rindex + sizeof(uint32_t) > p->size)
- return -1;
-
- d = (uint8_t*) (AVAHI_DNS_PACKET_DATA(p) + p->rindex);
- *ret_v = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
- p->rindex += sizeof(uint32_t);
-
- return 0;
-}
-
-int avahi_dns_packet_consume_bytes(AvahiDnsPacket *p, void * ret_data, size_t l) {
- assert(p);
- assert(ret_data);
- assert(l > 0);
-
- if (p->rindex + l > p->size)
- return -1;
-
- memcpy(ret_data, AVAHI_DNS_PACKET_DATA(p) + p->rindex, l);
- p->rindex += l;
-
- return 0;
-}
-
-int avahi_dns_packet_consume_string(AvahiDnsPacket *p, char *ret_string, size_t l) {
- size_t k;
-
- assert(p);
- assert(ret_string);
- assert(l > 0);
-
- if (p->rindex >= p->size)
- return -1;
-
- k = AVAHI_DNS_PACKET_DATA(p)[p->rindex];
-
- if (p->rindex+1+k > p->size)
- return -1;
-
- if (l > k+1)
- l = k+1;
-
- memcpy(ret_string, AVAHI_DNS_PACKET_DATA(p)+p->rindex+1, l-1);
- ret_string[l-1] = 0;
-
- p->rindex += 1+k;
-
- return 0;
-}
-
-const void* avahi_dns_packet_get_rptr(AvahiDnsPacket *p) {
- assert(p);
-
- if (p->rindex > p->size)
- return NULL;
-
- return AVAHI_DNS_PACKET_DATA(p) + p->rindex;
-}
-
-int avahi_dns_packet_skip(AvahiDnsPacket *p, size_t length) {
- assert(p);
-
- if (p->rindex + length > p->size)
- return -1;
-
- p->rindex += length;
- return 0;
-}
-
-static int parse_rdata(AvahiDnsPacket *p, AvahiRecord *r, uint16_t rdlength) {
- char buf[AVAHI_DOMAIN_NAME_MAX];
- const void* start;
-
- assert(p);
- assert(r);
-
- start = avahi_dns_packet_get_rptr(p);
-
- switch (r->key->type) {
- case AVAHI_DNS_TYPE_PTR:
- case AVAHI_DNS_TYPE_CNAME:
- case AVAHI_DNS_TYPE_NS:
-
- if (avahi_dns_packet_consume_name(p, buf, sizeof(buf)) < 0)
- return -1;
-
- r->data.ptr.name = avahi_strdup(buf);
- break;
-
-
- case AVAHI_DNS_TYPE_SRV:
-
- if (avahi_dns_packet_consume_uint16(p, &r->data.srv.priority) < 0 ||
- avahi_dns_packet_consume_uint16(p, &r->data.srv.weight) < 0 ||
- avahi_dns_packet_consume_uint16(p, &r->data.srv.port) < 0 ||
- avahi_dns_packet_consume_name(p, buf, sizeof(buf)) < 0)
- return -1;
-
- r->data.srv.name = avahi_strdup(buf);
- break;
-
- case AVAHI_DNS_TYPE_HINFO:
-
- if (avahi_dns_packet_consume_string(p, buf, sizeof(buf)) < 0)
- return -1;
-
- r->data.hinfo.cpu = avahi_strdup(buf);
-
- if (avahi_dns_packet_consume_string(p, buf, sizeof(buf)) < 0)
- return -1;
-
- r->data.hinfo.os = avahi_strdup(buf);
- break;
-
- case AVAHI_DNS_TYPE_TXT:
-
- if (rdlength > 0) {
- if (avahi_string_list_parse(avahi_dns_packet_get_rptr(p), rdlength, &r->data.txt.string_list) < 0)
- return -1;
-
- if (avahi_dns_packet_skip(p, rdlength) < 0)
- return -1;
- } else
- r->data.txt.string_list = NULL;
-
- break;
-
- case AVAHI_DNS_TYPE_A:
-
-/* avahi_log_debug("A"); */
-
- if (avahi_dns_packet_consume_bytes(p, &r->data.a.address, sizeof(AvahiIPv4Address)) < 0)
- return -1;
-
- break;
-
- case AVAHI_DNS_TYPE_AAAA:
-
-/* avahi_log_debug("aaaa"); */
-
- if (avahi_dns_packet_consume_bytes(p, &r->data.aaaa.address, sizeof(AvahiIPv6Address)) < 0)
- return -1;
-
- break;
-
- default:
-
-/* avahi_log_debug("generic"); */
-
- if (rdlength > 0) {
-
- r->data.generic.data = avahi_memdup(avahi_dns_packet_get_rptr(p), rdlength);
- r->data.generic.size = rdlength;
-
- if (avahi_dns_packet_skip(p, rdlength) < 0)
- return -1;
- }
-
- break;
- }
-
- /* Check if we read enough data */
- if ((const uint8_t*) avahi_dns_packet_get_rptr(p) - (const uint8_t*) start != rdlength)
- return -1;
-
- return 0;
-}
-
-AvahiRecord* avahi_dns_packet_consume_record(AvahiDnsPacket *p, int *ret_cache_flush) {
- char name[AVAHI_DOMAIN_NAME_MAX];
- uint16_t type, class;
- uint32_t ttl;
- uint16_t rdlength;
- AvahiRecord *r = NULL;
-
- assert(p);
-
- if (avahi_dns_packet_consume_name(p, name, sizeof(name)) < 0 ||
- avahi_dns_packet_consume_uint16(p, &type) < 0 ||
- avahi_dns_packet_consume_uint16(p, &class) < 0 ||
- avahi_dns_packet_consume_uint32(p, &ttl) < 0 ||
- avahi_dns_packet_consume_uint16(p, &rdlength) < 0 ||
- p->rindex + rdlength > p->size)
- goto fail;
-
- if (ret_cache_flush)
- *ret_cache_flush = !!(class & AVAHI_DNS_CACHE_FLUSH);
- class &= ~AVAHI_DNS_CACHE_FLUSH;
-
- if (!(r = avahi_record_new_full(name, class, type, ttl)))
- goto fail;
-
- if (parse_rdata(p, r, rdlength) < 0)
- goto fail;
-
- if (!avahi_record_is_valid(r))
- goto fail;
-
- return r;
-
-fail:
- if (r)
- avahi_record_unref(r);
-
- return NULL;
-}
-
-AvahiKey* avahi_dns_packet_consume_key(AvahiDnsPacket *p, int *ret_unicast_response) {
- char name[256];
- uint16_t type, class;
- AvahiKey *k;
-
- assert(p);
-
- if (avahi_dns_packet_consume_name(p, name, sizeof(name)) < 0 ||
- avahi_dns_packet_consume_uint16(p, &type) < 0 ||
- avahi_dns_packet_consume_uint16(p, &class) < 0)
- return NULL;
-
- if (ret_unicast_response)
- *ret_unicast_response = !!(class & AVAHI_DNS_UNICAST_RESPONSE);
-
- class &= ~AVAHI_DNS_UNICAST_RESPONSE;
-
- if (!(k = avahi_key_new(name, class, type)))
- return NULL;
-
- if (!avahi_key_is_valid(k)) {
- avahi_key_unref(k);
- return NULL;
- }
-
- return k;
-}
-
-uint8_t* avahi_dns_packet_append_key(AvahiDnsPacket *p, AvahiKey *k, int unicast_response) {
- uint8_t *t;
- size_t size;
-
- assert(p);
- assert(k);
-
- size = p->size;
-
- if (!(t = avahi_dns_packet_append_name(p, k->name)) ||
- !avahi_dns_packet_append_uint16(p, k->type) ||
- !avahi_dns_packet_append_uint16(p, k->clazz | (unicast_response ? AVAHI_DNS_UNICAST_RESPONSE : 0))) {
- p->size = size;
- avahi_dns_packet_cleanup_name_table(p);
-
- return NULL;
- }
-
- return t;
-}
-
-static int append_rdata(AvahiDnsPacket *p, AvahiRecord *r) {
- assert(p);
- assert(r);
-
- switch (r->key->type) {
-
- case AVAHI_DNS_TYPE_PTR:
- case AVAHI_DNS_TYPE_CNAME:
- case AVAHI_DNS_TYPE_NS:
-
- if (!(avahi_dns_packet_append_name(p, r->data.ptr.name)))
- return -1;
-
- break;
-
- case AVAHI_DNS_TYPE_SRV:
-
- if (!avahi_dns_packet_append_uint16(p, r->data.srv.priority) ||
- !avahi_dns_packet_append_uint16(p, r->data.srv.weight) ||
- !avahi_dns_packet_append_uint16(p, r->data.srv.port) ||
- !avahi_dns_packet_append_name(p, r->data.srv.name))
- return -1;
-
- break;
-
- case AVAHI_DNS_TYPE_HINFO:
- if (!avahi_dns_packet_append_string(p, r->data.hinfo.cpu) ||
- !avahi_dns_packet_append_string(p, r->data.hinfo.os))
- return -1;
-
- break;
-
- case AVAHI_DNS_TYPE_TXT: {
-
- uint8_t *data;
- size_t n;
-
- n = avahi_string_list_serialize(r->data.txt.string_list, NULL, 0);
-
- if (!(data = avahi_dns_packet_extend(p, n)))
- return -1;
-
- avahi_string_list_serialize(r->data.txt.string_list, data, n);
- break;
- }
-
-
- case AVAHI_DNS_TYPE_A:
-
- if (!avahi_dns_packet_append_bytes(p, &r->data.a.address, sizeof(r->data.a.address)))
- return -1;
-
- break;
-
- case AVAHI_DNS_TYPE_AAAA:
-
- if (!avahi_dns_packet_append_bytes(p, &r->data.aaaa.address, sizeof(r->data.aaaa.address)))
- return -1;
-
- break;
-
- default:
-
- if (r->data.generic.size)
- if (!avahi_dns_packet_append_bytes(p, r->data.generic.data, r->data.generic.size))
- return -1;
-
- break;
- }
-
- return 0;
-}
-
-
-uint8_t* avahi_dns_packet_append_record(AvahiDnsPacket *p, AvahiRecord *r, int cache_flush, unsigned max_ttl) {
- uint8_t *t, *l, *start;
- size_t size;
-
- assert(p);
- assert(r);
-
- size = p->size;
-
- if (!(t = avahi_dns_packet_append_name(p, r->key->name)) ||
- !avahi_dns_packet_append_uint16(p, r->key->type) ||
- !avahi_dns_packet_append_uint16(p, cache_flush ? (r->key->clazz | AVAHI_DNS_CACHE_FLUSH) : (r->key->clazz &~ AVAHI_DNS_CACHE_FLUSH)) ||
- !avahi_dns_packet_append_uint32(p, (max_ttl && r->ttl > max_ttl) ? max_ttl : r->ttl) ||
- !(l = avahi_dns_packet_append_uint16(p, 0)))
- goto fail;
-
- start = avahi_dns_packet_extend(p, 0);
-
- if (append_rdata(p, r) < 0)
- goto fail;
-
- size = avahi_dns_packet_extend(p, 0) - start;
- assert(size <= AVAHI_DNS_RDATA_MAX);
-
-/* avahi_log_debug("appended %u", size); */
-
- l[0] = (uint8_t) ((uint16_t) size >> 8);
- l[1] = (uint8_t) ((uint16_t) size);
-
- return t;
-
-
-fail:
- p->size = size;
- avahi_dns_packet_cleanup_name_table(p);
-
- return NULL;
-}
-
-int avahi_dns_packet_is_empty(AvahiDnsPacket *p) {
- assert(p);
-
- return p->size <= AVAHI_DNS_PACKET_HEADER_SIZE;
-}
-
-size_t avahi_dns_packet_space(AvahiDnsPacket *p) {
- assert(p);
-
- assert(p->size <= p->max_size);
-
- return p->max_size - p->size;
-}
-
-int avahi_rdata_parse(AvahiRecord *record, const void* rdata, size_t size) {
- int ret;
- AvahiDnsPacket p;
-
- assert(record);
- assert(rdata);
-
- p.data = (void*) rdata;
- p.max_size = p.size = size;
- p.rindex = 0;
- p.name_table = NULL;
-
- ret = parse_rdata(&p, record, size);
-
- assert(!p.name_table);
-
- return ret;
-}
-
-size_t avahi_rdata_serialize(AvahiRecord *record, void *rdata, size_t max_size) {
- int ret;
- AvahiDnsPacket p;
-
- assert(record);
- assert(rdata);
- assert(max_size > 0);
-
- p.data = (void*) rdata;
- p.max_size = max_size;
- p.size = p.rindex = 0;
- p.name_table = NULL;
-
- ret = append_rdata(&p, record);
-
- if (p.name_table)
- avahi_hashmap_free(p.name_table);
-
- if (ret < 0)
- return (size_t) -1;
-
- return p.size;
-}
projects / catta / blobdiff