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
|
/*
* pkthdr.h - packet header from wire conversion routines
*
* a Net::DNS like library for C
*
* (c) NLnet Labs, 2005-2006
*
* See the file LICENSE for the license
*/
/**
* \file
*
* Contains functions that translate dns data from the wire format (as sent
* by servers and clients) to the internal structures for the packet header.
*/
#ifndef LDNS_PKTHDR_H
#define LDNS_PKTHDR_H
#ifdef __cplusplus
extern "C" {
#endif
/* The length of the header */
#define LDNS_HEADER_SIZE 12
/* First octet of flags */
#define LDNS_RD_MASK 0x01U
#define LDNS_RD_SHIFT 0
#define LDNS_RD_WIRE(wirebuf) (*(wirebuf+2) & LDNS_RD_MASK)
#define LDNS_RD_SET(wirebuf) (*(wirebuf+2) |= LDNS_RD_MASK)
#define LDNS_RD_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_RD_MASK)
#define LDNS_TC_MASK 0x02U
#define LDNS_TC_SHIFT 1
#define LDNS_TC_WIRE(wirebuf) (*(wirebuf+2) & LDNS_TC_MASK)
#define LDNS_TC_SET(wirebuf) (*(wirebuf+2) |= LDNS_TC_MASK)
#define LDNS_TC_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_TC_MASK)
#define LDNS_AA_MASK 0x04U
#define LDNS_AA_SHIFT 2
#define LDNS_AA_WIRE(wirebuf) (*(wirebuf+2) & LDNS_AA_MASK)
#define LDNS_AA_SET(wirebuf) (*(wirebuf+2) |= LDNS_AA_MASK)
#define LDNS_AA_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_AA_MASK)
#define LDNS_OPCODE_MASK 0x78U
#define LDNS_OPCODE_SHIFT 3
#define LDNS_OPCODE_WIRE(wirebuf) ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
#define LDNS_OPCODE_SET(wirebuf, opcode) \
(*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
#define LDNS_QR_MASK 0x80U
#define LDNS_QR_SHIFT 7
#define LDNS_QR_WIRE(wirebuf) (*(wirebuf+2) & LDNS_QR_MASK)
#define LDNS_QR_SET(wirebuf) (*(wirebuf+2) |= LDNS_QR_MASK)
#define LDNS_QR_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_QR_MASK)
/* Second octet of flags */
#define LDNS_RCODE_MASK 0x0fU
#define LDNS_RCODE_SHIFT 0
#define LDNS_RCODE_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RCODE_MASK)
#define LDNS_RCODE_SET(wirebuf, rcode) \
(*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
#define LDNS_CD_MASK 0x10U
#define LDNS_CD_SHIFT 4
#define LDNS_CD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_CD_MASK)
#define LDNS_CD_SET(wirebuf) (*(wirebuf+3) |= LDNS_CD_MASK)
#define LDNS_CD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_CD_MASK)
#define LDNS_AD_MASK 0x20U
#define LDNS_AD_SHIFT 5
#define LDNS_AD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_AD_MASK)
#define LDNS_AD_SET(wirebuf) (*(wirebuf+3) |= LDNS_AD_MASK)
#define LDNS_AD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_AD_MASK)
#define LDNS_Z_MASK 0x40U
#define LDNS_Z_SHIFT 6
#define LDNS_Z_WIRE(wirebuf) (*(wirebuf+3) & LDNS_Z_MASK)
#define LDNS_Z_SET(wirebuf) (*(wirebuf+3) |= LDNS_Z_MASK)
#define LDNS_Z_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_Z_MASK)
#define LDNS_RA_MASK 0x80U
#define LDNS_RA_SHIFT 7
#define LDNS_RA_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RA_MASK)
#define LDNS_RA_SET(wirebuf) (*(wirebuf+3) |= LDNS_RA_MASK)
#define LDNS_RA_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_RA_MASK)
/* Query ID */
#define LDNS_ID_WIRE(wirebuf) (sldns_read_uint16(wirebuf))
#define LDNS_ID_SET(wirebuf, id) (sldns_write_uint16(wirebuf, id))
/* Counter of the question section */
#define LDNS_QDCOUNT_OFF 4
/*
#define QDCOUNT(wirebuf) (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF)))
*/
#define LDNS_QDCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
/* Counter of the answer section */
#define LDNS_ANCOUNT_OFF 6
#define LDNS_ANCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
/* Counter of the authority section */
#define LDNS_NSCOUNT_OFF 8
#define LDNS_NSCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
/* Counter of the additional section */
#define LDNS_ARCOUNT_OFF 10
#define LDNS_ARCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
/**
* The sections of a packet
*/
enum sldns_enum_pkt_section {
LDNS_SECTION_QUESTION = 0,
LDNS_SECTION_ANSWER = 1,
LDNS_SECTION_AUTHORITY = 2,
LDNS_SECTION_ADDITIONAL = 3,
/** bogus section, if not interested */
LDNS_SECTION_ANY = 4,
/** used to get all non-question rrs from a packet */
LDNS_SECTION_ANY_NOQUESTION = 5
};
typedef enum sldns_enum_pkt_section sldns_pkt_section;
/* opcodes for pkt's */
enum sldns_enum_pkt_opcode {
LDNS_PACKET_QUERY = 0,
LDNS_PACKET_IQUERY = 1,
LDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */
LDNS_PACKET_NOTIFY = 4,
LDNS_PACKET_UPDATE = 5
};
typedef enum sldns_enum_pkt_opcode sldns_pkt_opcode;
/* rcodes for pkts */
enum sldns_enum_pkt_rcode {
LDNS_RCODE_NOERROR = 0,
LDNS_RCODE_FORMERR = 1,
LDNS_RCODE_SERVFAIL = 2,
LDNS_RCODE_NXDOMAIN = 3,
LDNS_RCODE_NOTIMPL = 4,
LDNS_RCODE_REFUSED = 5,
LDNS_RCODE_YXDOMAIN = 6,
LDNS_RCODE_YXRRSET = 7,
LDNS_RCODE_NXRRSET = 8,
LDNS_RCODE_NOTAUTH = 9,
LDNS_RCODE_NOTZONE = 10
};
typedef enum sldns_enum_pkt_rcode sldns_pkt_rcode;
#ifdef __cplusplus
}
#endif
#endif /* LDNS_PKTHDR_H */
|
