1#ifndef foodnshfoo
2#define foodnshfoo
3
4/* $Id$ */
5
6/***
7  This file is part of avahi.
8
9  avahi is free software; you can redistribute it and/or modify it
10  under the terms of the GNU Lesser General Public License as
11  published by the Free Software Foundation; either version 2.1 of the
12  License, or (at your option) any later version.
13
14  avahi is distributed in the hope that it will be useful, but WITHOUT
15  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
17  Public License for more details.
18
19  You should have received a copy of the GNU Lesser General Public
20  License along with avahi; if not, write to the Free Software
21  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22  USA.
23***/
24
25#include "rr.h"
26#include "hashmap.h"
27
28#define AVAHI_DNS_PACKET_HEADER_SIZE 12
29#define AVAHI_DNS_PACKET_EXTRA_SIZE 48
30#define AVAHI_DNS_LABELS_MAX 127
31#define AVAHI_DNS_RDATA_MAX 0xFFFF
32#define AVAHI_DNS_PACKET_SIZE_MAX (AVAHI_DNS_PACKET_HEADER_SIZE + 256 + 2 + 2 + 4 + 2 + AVAHI_DNS_RDATA_MAX)
33
34typedef struct AvahiDnsPacket {
35    size_t size, rindex, max_size;
36    AvahiHashmap *name_table; /* for name compression */
37    uint8_t *data;
38} AvahiDnsPacket;
39
40#define AVAHI_DNS_PACKET_DATA(p) ((p)->data ? (p)->data : ((uint8_t*) p) + sizeof(AvahiDnsPacket))
41
42AvahiDnsPacket* avahi_dns_packet_new(unsigned mtu);
43AvahiDnsPacket* avahi_dns_packet_new_query(unsigned mtu);
44AvahiDnsPacket* avahi_dns_packet_new_response(unsigned mtu, int aa);
45
46AvahiDnsPacket* avahi_dns_packet_new_reply(AvahiDnsPacket* p, unsigned mtu, int copy_queries, int aa);
47
48void avahi_dns_packet_free(AvahiDnsPacket *p);
49void avahi_dns_packet_set_field(AvahiDnsPacket *p, unsigned idx, uint16_t v);
50uint16_t avahi_dns_packet_get_field(AvahiDnsPacket *p, unsigned idx);
51void avahi_dns_packet_inc_field(AvahiDnsPacket *p, unsigned idx);
52
53uint8_t *avahi_dns_packet_extend(AvahiDnsPacket *p, size_t l);
54
55void avahi_dns_packet_cleanup_name_table(AvahiDnsPacket *p);
56
57uint8_t *avahi_dns_packet_append_uint16(AvahiDnsPacket *p, uint16_t v);
58uint8_t *avahi_dns_packet_append_uint32(AvahiDnsPacket *p, uint32_t v);
59uint8_t *avahi_dns_packet_append_name(AvahiDnsPacket *p, const char *name);
60uint8_t *avahi_dns_packet_append_bytes(AvahiDnsPacket  *p, const void *d, size_t l);
61uint8_t* avahi_dns_packet_append_key(AvahiDnsPacket *p, AvahiKey *k, int unicast_response);
62uint8_t* avahi_dns_packet_append_record(AvahiDnsPacket *p, AvahiRecord *r, int cache_flush, unsigned max_ttl);
63uint8_t* avahi_dns_packet_append_string(AvahiDnsPacket *p, const char *s);
64
65int avahi_dns_packet_is_query(AvahiDnsPacket *p);
66int avahi_dns_packet_check_valid(AvahiDnsPacket *p);
67int avahi_dns_packet_check_valid_multicast(AvahiDnsPacket *p);
68
69int avahi_dns_packet_consume_uint16(AvahiDnsPacket *p, uint16_t *ret_v);
70int avahi_dns_packet_consume_uint32(AvahiDnsPacket *p, uint32_t *ret_v);
71int avahi_dns_packet_consume_name(AvahiDnsPacket *p, char *ret_name, size_t l);
72int avahi_dns_packet_consume_bytes(AvahiDnsPacket *p, void* ret_data, size_t l);
73AvahiKey* avahi_dns_packet_consume_key(AvahiDnsPacket *p, int *ret_unicast_response);
74AvahiRecord* avahi_dns_packet_consume_record(AvahiDnsPacket *p, int *ret_cache_flush);
75int avahi_dns_packet_consume_string(AvahiDnsPacket *p, char *ret_string, size_t l);
76
77const void* avahi_dns_packet_get_rptr(AvahiDnsPacket *p);
78
79int avahi_dns_packet_skip(AvahiDnsPacket *p, size_t length);
80
81int avahi_dns_packet_is_empty(AvahiDnsPacket *p);
82size_t avahi_dns_packet_space(AvahiDnsPacket *p);
83
84#define AVAHI_DNS_FIELD_ID 0
85#define AVAHI_DNS_FIELD_FLAGS 1
86#define AVAHI_DNS_FIELD_QDCOUNT 2
87#define AVAHI_DNS_FIELD_ANCOUNT 3
88#define AVAHI_DNS_FIELD_NSCOUNT 4
89#define AVAHI_DNS_FIELD_ARCOUNT 5
90
91#define AVAHI_DNS_FLAG_QR (1 << 15)
92#define AVAHI_DNS_FLAG_OPCODE (15 << 11)
93#define AVAHI_DNS_FLAG_RCODE (15)
94#define AVAHI_DNS_FLAG_TC (1 << 9)
95#define AVAHI_DNS_FLAG_AA (1 << 10)
96
97#define AVAHI_DNS_FLAGS(qr, opcode, aa, tc, rd, ra, z, ad, cd, rcode) \
98        (((uint16_t) !!qr << 15) |  \
99         ((uint16_t) (opcode & 15) << 11) | \
100         ((uint16_t) !!aa << 10) | \
101         ((uint16_t) !!tc << 9) | \
102         ((uint16_t) !!rd << 8) | \
103         ((uint16_t) !!ra << 7) | \
104         ((uint16_t) !!ad << 5) | \
105         ((uint16_t) !!cd << 4) | \
106         ((uint16_t) (rcode & 15)))
107
108#define AVAHI_MDNS_SUFFIX_LOCAL "local"
109#define AVAHI_MDNS_SUFFIX_ADDR_IPV4 "254.169.in-addr.arpa"
110#define AVAHI_MDNS_SUFFIX_ADDR_IPV6 "0.8.e.f.ip6.arpa"
111
112#endif
113
114