ldns  1.7.0
wire2host.h
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1 /*
2  * wire2host.h - from wire conversion routines
3  *
4  * a Net::DNS like library for C
5  *
6  * (c) NLnet Labs, 2005-2006
7  *
8  * See the file LICENSE for the license
9  */
10 
18 #ifndef LDNS_WIRE2HOST_H
19 #define LDNS_WIRE2HOST_H
20 
21 #include <ldns/rdata.h>
22 #include <ldns/common.h>
23 #include <ldns/error.h>
24 #include <ldns/rr.h>
25 #include <ldns/packet.h>
26 
27 #ifdef __cplusplus
28 extern "C" {
29 #endif
30 
31 /* The length of the header */
32 #define LDNS_HEADER_SIZE 12
33 
34 /* First octet of flags */
35 #define LDNS_RD_MASK 0x01U
36 #define LDNS_RD_SHIFT 0
37 #define LDNS_RD_WIRE(wirebuf) (*(wirebuf+2) & LDNS_RD_MASK)
38 #define LDNS_RD_SET(wirebuf) (*(wirebuf+2) |= LDNS_RD_MASK)
39 #define LDNS_RD_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_RD_MASK)
40 
41 #define LDNS_TC_MASK 0x02U
42 #define LDNS_TC_SHIFT 1
43 #define LDNS_TC_WIRE(wirebuf) (*(wirebuf+2) & LDNS_TC_MASK)
44 #define LDNS_TC_SET(wirebuf) (*(wirebuf+2) |= LDNS_TC_MASK)
45 #define LDNS_TC_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_TC_MASK)
46 
47 #define LDNS_AA_MASK 0x04U
48 #define LDNS_AA_SHIFT 2
49 #define LDNS_AA_WIRE(wirebuf) (*(wirebuf+2) & LDNS_AA_MASK)
50 #define LDNS_AA_SET(wirebuf) (*(wirebuf+2) |= LDNS_AA_MASK)
51 #define LDNS_AA_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_AA_MASK)
52 
53 #define LDNS_OPCODE_MASK 0x78U
54 #define LDNS_OPCODE_SHIFT 3
55 #define LDNS_OPCODE_WIRE(wirebuf) ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
56 #define LDNS_OPCODE_SET(wirebuf, opcode) \
57  (*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
58 
59 #define LDNS_QR_MASK 0x80U
60 #define LDNS_QR_SHIFT 7
61 #define LDNS_QR_WIRE(wirebuf) (*(wirebuf+2) & LDNS_QR_MASK)
62 #define LDNS_QR_SET(wirebuf) (*(wirebuf+2) |= LDNS_QR_MASK)
63 #define LDNS_QR_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_QR_MASK)
64 
65 /* Second octet of flags */
66 #define LDNS_RCODE_MASK 0x0fU
67 #define LDNS_RCODE_SHIFT 0
68 #define LDNS_RCODE_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RCODE_MASK)
69 #define LDNS_RCODE_SET(wirebuf, rcode) \
70  (*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
71 
72 #define LDNS_CD_MASK 0x10U
73 #define LDNS_CD_SHIFT 4
74 #define LDNS_CD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_CD_MASK)
75 #define LDNS_CD_SET(wirebuf) (*(wirebuf+3) |= LDNS_CD_MASK)
76 #define LDNS_CD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_CD_MASK)
77 
78 #define LDNS_AD_MASK 0x20U
79 #define LDNS_AD_SHIFT 5
80 #define LDNS_AD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_AD_MASK)
81 #define LDNS_AD_SET(wirebuf) (*(wirebuf+3) |= LDNS_AD_MASK)
82 #define LDNS_AD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_AD_MASK)
83 
84 #define LDNS_Z_MASK 0x40U
85 #define LDNS_Z_SHIFT 6
86 #define LDNS_Z_WIRE(wirebuf) (*(wirebuf+3) & LDNS_Z_MASK)
87 #define LDNS_Z_SET(wirebuf) (*(wirebuf+3) |= LDNS_Z_MASK)
88 #define LDNS_Z_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_Z_MASK)
89 
90 #define LDNS_RA_MASK 0x80U
91 #define LDNS_RA_SHIFT 7
92 #define LDNS_RA_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RA_MASK)
93 #define LDNS_RA_SET(wirebuf) (*(wirebuf+3) |= LDNS_RA_MASK)
94 #define LDNS_RA_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_RA_MASK)
95 
96 /* Query ID */
97 #define LDNS_ID_WIRE(wirebuf) (ldns_read_uint16(wirebuf))
98 #define LDNS_ID_SET(wirebuf, id) (ldns_write_uint16(wirebuf, id))
99 
100 /* Counter of the question section */
101 #define LDNS_QDCOUNT_OFF 4
102 #define LDNS_QDCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
103 
104 /* Counter of the answer section */
105 #define LDNS_ANCOUNT_OFF 6
106 #define LDNS_ANCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
107 
108 /* Counter of the authority section */
109 #define LDNS_NSCOUNT_OFF 8
110 #define LDNS_NSCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
111 
112 /* Counter of the additional section */
113 #define LDNS_ARCOUNT_OFF 10
114 #define LDNS_ARCOUNT(wirebuf) (ldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
115 
126 ldns_status ldns_wire2pkt(ldns_pkt **packet, const uint8_t *data, size_t len);
127 
137 ldns_status ldns_buffer2pkt_wire(ldns_pkt **packet, const ldns_buffer *buffer);
138 
152 ldns_status ldns_wire2dname(ldns_rdf **dname, const uint8_t *wire, size_t max, size_t *pos);
153 
171 ldns_status ldns_wire2rdf(ldns_rr *rr, const uint8_t *wire, size_t max, size_t *pos);
172 
188 ldns_status ldns_wire2rr(ldns_rr **rr, const uint8_t *wire, size_t max, size_t *pos, ldns_pkt_section section);
189 
190 #ifdef __cplusplus
191 }
192 #endif
193 
194 #endif /* LDNS_WIRE2HOST_H */
ldns_status ldns_buffer2pkt_wire(ldns_pkt **packet, const ldns_buffer *buffer)
converts the data in the ldns_buffer (in wire format) to a DNS packet.
Definition: wire2host.c:395
implementation of buffers to ease operations
Definition: buffer.h:50
Defines ldns_rdf and functions to manipulate those.
Contains the definition of ldns_rr and functions to manipulate those.
Resource Record.
Definition: rr.h:302
Defines error numbers and functions to translate those to a readable string.
ldns_status ldns_wire2rr(ldns_rr **rr, const uint8_t *wire, size_t max, size_t *pos, ldns_pkt_section section)
converts the data on the uint8_t bytearray (in wire format) to a DNS resource record.
Definition: wire2host.c:319
ldns_status ldns_wire2pkt(ldns_pkt **packet, const uint8_t *data, size_t len)
converts the data on the uint8_t bytearray (in wire format) to a DNS packet.
Definition: wire2host.c:404
DNS packet.
Definition: packet.h:233
ldns_status ldns_wire2rdf(ldns_rr *rr, const uint8_t *wire, size_t max, size_t *pos)
converts the data on the uint8_t bytearray (in wire format) to DNS rdata fields, and adds them to the...
Definition: wire2host.c:158
enum ldns_enum_status ldns_status
Definition: error.h:134
Contains the definition of ldns_pkt and its parts, as well as functions to manipulate those...
Resource record data field.
Definition: rdata.h:174
Common definitions for LDNS.
enum ldns_enum_pkt_section ldns_pkt_section
Definition: packet.h:284
ldns_status ldns_wire2dname(ldns_rdf **dname, const uint8_t *wire, size_t max, size_t *pos)
converts the data on the uint8_t bytearray (in wire format) to a DNS dname rdata field.
Definition: wire2host.c:56