Electroneum
pkthdr.h
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1 /*
2  * pkthdr.h - packet header 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_PKTHDR_H
19 #define LDNS_PKTHDR_H
20 
21 #ifdef __cplusplus
22 extern "C" {
23 #endif
24 
25 /* The length of the header */
26 #define LDNS_HEADER_SIZE 12
27 
28 /* First octet of flags */
29 #define LDNS_RD_MASK 0x01U
30 #define LDNS_RD_SHIFT 0
31 #define LDNS_RD_WIRE(wirebuf) (*(wirebuf+2) & LDNS_RD_MASK)
32 #define LDNS_RD_SET(wirebuf) (*(wirebuf+2) |= LDNS_RD_MASK)
33 #define LDNS_RD_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_RD_MASK)
34 
35 #define LDNS_TC_MASK 0x02U
36 #define LDNS_TC_SHIFT 1
37 #define LDNS_TC_WIRE(wirebuf) (*(wirebuf+2) & LDNS_TC_MASK)
38 #define LDNS_TC_SET(wirebuf) (*(wirebuf+2) |= LDNS_TC_MASK)
39 #define LDNS_TC_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_TC_MASK)
40 
41 #define LDNS_AA_MASK 0x04U
42 #define LDNS_AA_SHIFT 2
43 #define LDNS_AA_WIRE(wirebuf) (*(wirebuf+2) & LDNS_AA_MASK)
44 #define LDNS_AA_SET(wirebuf) (*(wirebuf+2) |= LDNS_AA_MASK)
45 #define LDNS_AA_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_AA_MASK)
46 
47 #define LDNS_OPCODE_MASK 0x78U
48 #define LDNS_OPCODE_SHIFT 3
49 #define LDNS_OPCODE_WIRE(wirebuf) ((*(wirebuf+2) & LDNS_OPCODE_MASK) >> LDNS_OPCODE_SHIFT)
50 #define LDNS_OPCODE_SET(wirebuf, opcode) \
51  (*(wirebuf+2) = ((*(wirebuf+2)) & ~LDNS_OPCODE_MASK) | ((opcode) << LDNS_OPCODE_SHIFT))
52 
53 #define LDNS_QR_MASK 0x80U
54 #define LDNS_QR_SHIFT 7
55 #define LDNS_QR_WIRE(wirebuf) (*(wirebuf+2) & LDNS_QR_MASK)
56 #define LDNS_QR_SET(wirebuf) (*(wirebuf+2) |= LDNS_QR_MASK)
57 #define LDNS_QR_CLR(wirebuf) (*(wirebuf+2) &= ~LDNS_QR_MASK)
58 
59 /* Second octet of flags */
60 #define LDNS_RCODE_MASK 0x0fU
61 #define LDNS_RCODE_SHIFT 0
62 #define LDNS_RCODE_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RCODE_MASK)
63 #define LDNS_RCODE_SET(wirebuf, rcode) \
64  (*(wirebuf+3) = ((*(wirebuf+3)) & ~LDNS_RCODE_MASK) | (rcode))
65 
66 #define LDNS_CD_MASK 0x10U
67 #define LDNS_CD_SHIFT 4
68 #define LDNS_CD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_CD_MASK)
69 #define LDNS_CD_SET(wirebuf) (*(wirebuf+3) |= LDNS_CD_MASK)
70 #define LDNS_CD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_CD_MASK)
71 
72 #define LDNS_AD_MASK 0x20U
73 #define LDNS_AD_SHIFT 5
74 #define LDNS_AD_WIRE(wirebuf) (*(wirebuf+3) & LDNS_AD_MASK)
75 #define LDNS_AD_SET(wirebuf) (*(wirebuf+3) |= LDNS_AD_MASK)
76 #define LDNS_AD_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_AD_MASK)
77 
78 #define LDNS_Z_MASK 0x40U
79 #define LDNS_Z_SHIFT 6
80 #define LDNS_Z_WIRE(wirebuf) (*(wirebuf+3) & LDNS_Z_MASK)
81 #define LDNS_Z_SET(wirebuf) (*(wirebuf+3) |= LDNS_Z_MASK)
82 #define LDNS_Z_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_Z_MASK)
83 
84 #define LDNS_RA_MASK 0x80U
85 #define LDNS_RA_SHIFT 7
86 #define LDNS_RA_WIRE(wirebuf) (*(wirebuf+3) & LDNS_RA_MASK)
87 #define LDNS_RA_SET(wirebuf) (*(wirebuf+3) |= LDNS_RA_MASK)
88 #define LDNS_RA_CLR(wirebuf) (*(wirebuf+3) &= ~LDNS_RA_MASK)
89 
90 /* Query ID */
91 #define LDNS_ID_WIRE(wirebuf) (sldns_read_uint16(wirebuf))
92 #define LDNS_ID_SET(wirebuf, id) (sldns_write_uint16(wirebuf, id))
93 
94 /* Counter of the question section */
95 #define LDNS_QDCOUNT_OFF 4
96 /*
97 #define QDCOUNT(wirebuf) (ntohs(*(uint16_t *)(wirebuf+QDCOUNT_OFF)))
98 */
99 #define LDNS_QDCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_QDCOUNT_OFF))
100 
101 /* Counter of the answer section */
102 #define LDNS_ANCOUNT_OFF 6
103 #define LDNS_ANCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF))
104 
105 /* Counter of the authority section */
106 #define LDNS_NSCOUNT_OFF 8
107 #define LDNS_NSCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF))
108 
109 /* Counter of the additional section */
110 #define LDNS_ARCOUNT_OFF 10
111 #define LDNS_ARCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF))
112 
125 };
127 
128 /* opcodes for pkt's */
132  LDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */
135 };
137 
138 /* rcodes for pkts */
151 };
153 
154 #ifdef __cplusplus
155 }
156 #endif
157 
158 #endif /* LDNS_PKTHDR_H */
sldns_enum_pkt_rcode
Definition: pkthdr.h:139
sldns_enum_pkt_section
Definition: pkthdr.h:116
enum sldns_enum_pkt_rcode sldns_pkt_rcode
Definition: pkthdr.h:152
enum sldns_enum_pkt_opcode sldns_pkt_opcode
Definition: pkthdr.h:136
sldns_enum_pkt_opcode
Definition: pkthdr.h:129
enum sldns_enum_pkt_section sldns_pkt_section
Definition: pkthdr.h:126