--- /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/defs.h>
+#include <avahi/domain.h>
+#include <avahi/malloc.h>
+
+#include "dns.h"
+#include <avahi/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