1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
#ifndef foorrhfoo
#define foorrhfoo
/* $Id$ */
/***
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.
***/
/** \file rr.h Functions and definitions for manipulating DNS resource record (RR) data. */
#include <inttypes.h>
#include <sys/types.h>
#include <avahi-common/strlst.h>
#include <avahi-common/address.h>
#include <avahi-common/cdecl.h>
AVAHI_C_DECL_BEGIN
/** DNS record types, see RFC 1035, in addition to those defined in defs.h */
enum {
AVAHI_DNS_TYPE_ANY = 0xFF, /**< Special query type for requesting all records */
AVAHI_DNS_TYPE_OPT = 41, /**< EDNS0 option */
AVAHI_DNS_TYPE_TKEY = 249,
AVAHI_DNS_TYPE_TSIG = 250,
AVAHI_DNS_TYPE_IXFR = 251,
AVAHI_DNS_TYPE_AXFR = 252
};
/** TSIG signature algorithms, defined in RFCs 2845 and 4635 */
enum {
AVAHI_TSIG_HMAC_MD5 = 0x1,
AVAHI_TSIG_HMAC_SHA1 = 0x2,
AVAHI_TSIG_HMAC_SHA256 = 0x3
};
/** wide-area publishing flags */
enum {
AVAHI_WIDEAREA_PUBLISH = 0x1,
AVAHI_WIDEAREA_DELETE = 0x2
};
/** DNS record classes, see RFC 1035, in addition to those defined in defs.h */
enum {
AVAHI_DNS_CLASS_ANY = 0xFF, /**< Special query type for requesting all records */
AVAHI_DNS_CLASS_NONE = 0xFE, /**< Special query type for deleting a record */
AVAHI_DNS_CACHE_FLUSH = 0x8000, /**< Not really a class but a bit which may be set in response packets, see mDNS spec for more information */
AVAHI_DNS_UNICAST_RESPONSE = 0x8000 /**< Not really a class but a bit which may be set in query packets, see mDNS spec for more information */
};
/** Encapsulates a DNS query key consisting of class, type and
name. Use avahi_key_ref()/avahi_key_unref() for manipulating the
reference counter. The structure is intended to be treated as "immutable", no
changes should be imposed after creation */
typedef struct AvahiKey {
int ref; /**< Reference counter */
char *name; /**< Record name */
uint16_t clazz; /**< Record class, one of the AVAHI_DNS_CLASS_xxx constants */
uint16_t type; /**< Record type, one of the AVAHI_DNS_TYPE_xxx constants */
} AvahiKey;
/** Encapsulates a DNS resource record. The structure is intended to
* be treated as "immutable", no changes should be imposed after
* creation. */
typedef struct AvahiRecord {
int ref; /**< Reference counter */
AvahiKey *key; /**< Reference to the query key of this record */
uint32_t ttl; /**< DNS TTL of this record */
union {
struct {
void* data;
uint16_t size;
} generic; /**< Generic record data for unknown types */
struct {
uint16_t priority;
uint16_t weight;
uint16_t port;
char *name;
} srv; /**< Data for SRV records */
struct {
char *name;
} ptr, ns, cname; /**< Data for PTR, NS and CNAME records */
struct {
char *cpu;
char *os;
} hinfo; /**< Data for HINFO records */
struct {
AvahiStringList *string_list;
} txt; /**< Data for TXT records */
struct {
AvahiIPv4Address address;
} a; /**< Data for A records */
struct {
AvahiIPv6Address address;
} aaaa; /**< Data for AAAA records */
struct {
char *algorithm_name;
time_t time_signed; /* wire format is unusual uint48_t */
uint16_t fudge;
uint16_t mac_size;
char *mac;
uint16_t original_id;
uint16_t error;
uint16_t other_len;
char *other_data;
} tsig; /**< Data for TSIG records */
} data; /**< Record data */
} AvahiRecord;
/** Create a new AvahiKey object. The reference counter will be set to 1. */
AvahiKey *avahi_key_new(const char *name, uint16_t clazz, uint16_t type);
/** Increase the reference counter of an AvahiKey object by one */
AvahiKey *avahi_key_ref(AvahiKey *k);
/** Decrease the reference counter of an AvahiKey object by one */
void avahi_key_unref(AvahiKey *k);
/** Check whether two AvahiKey object contain the same
* data. AVAHI_DNS_CLASS_ANY/AVAHI_DNS_TYPE_ANY are treated like any
* other class/type. */
int avahi_key_equal(const AvahiKey *a, const AvahiKey *b);
/** Return a numeric hash value for a key for usage in hash tables. */
unsigned avahi_key_hash(const AvahiKey *k);
/** Create a new record object. Record data should be filled in right after creation. The reference counter is set to 1. */
AvahiRecord *avahi_record_new(AvahiKey *k, uint32_t ttl);
/** Create a new record object. Record data should be filled in right after creation. The reference counter is set to 1. */
AvahiRecord *avahi_record_new_full(const char *name, uint16_t clazz, uint16_t type, uint32_t ttl);
/** Increase the reference counter of an AvahiRecord by one. */
AvahiRecord *avahi_record_ref(AvahiRecord *r);
/** Decrease the reference counter of an AvahiRecord by one. */
void avahi_record_unref(AvahiRecord *r);
/** Return a textual representation of the specified DNS class. The
* returned pointer points to a read only internal string. */
const char *avahi_dns_class_to_string(uint16_t clazz);
/** Return a textual representation of the specified DNS class. The
* returned pointer points to a read only internal string. */
const char *avahi_dns_type_to_string(uint16_t type);
/** Create a textual representation of the specified key. avahi_free() the
* result! */
char *avahi_key_to_string(const AvahiKey *k);
/** Create a textual representation of the specified record, similar
* in style to BIND zone file data. avahi_free() the result! */
char *avahi_record_to_string(const AvahiRecord *r);
/** Check whether two records are equal (regardless of the TTL */
int avahi_record_equal_no_ttl(const AvahiRecord *a, const AvahiRecord *b);
/** Check whether the specified key is valid */
int avahi_key_is_valid(AvahiKey *k);
/** Check whether the specified record is valid */
int avahi_record_is_valid(AvahiRecord *r);
/** Parse a binary rdata object and fill it into *record. This function is actually implemented in dns.c */
int avahi_rdata_parse(AvahiRecord *record, const void* rdata, size_t size);
/** Serialize an AvahiRecord object into binary rdata. This function is actually implemented in dns.c */
size_t avahi_rdata_serialize(AvahiRecord *record, void *rdata, size_t max_size);
AVAHI_C_DECL_END
#endif
|
