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 11 /** 12 * \file 13 * 14 * Contains functions that translate dns data from the wire format (as sent 15 * by servers and clients) to the internal structures for the packet header. 16 */ 17 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 #define LDNS_QDCOUNT_SET(wirebuf, i) (sldns_write_uint16(wirebuf+LDNS_QDCOUNT_OFF, i)) 101 102 /* Counter of the answer section */ 103 #define LDNS_ANCOUNT_OFF 6 104 #define LDNS_ANCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ANCOUNT_OFF)) 105 #define LDNS_ANCOUNT_SET(wirebuf, i) (sldns_write_uint16(wirebuf+LDNS_ANCOUNT_OFF, i)) 106 107 /* Counter of the authority section */ 108 #define LDNS_NSCOUNT_OFF 8 109 #define LDNS_NSCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_NSCOUNT_OFF)) 110 #define LDNS_NSCOUNT_SET(wirebuf, i) (sldns_write_uint16(wirebuf+LDNS_NSCOUNT_OFF, i)) 111 112 /* Counter of the additional section */ 113 #define LDNS_ARCOUNT_OFF 10 114 #define LDNS_ARCOUNT(wirebuf) (sldns_read_uint16(wirebuf+LDNS_ARCOUNT_OFF)) 115 #define LDNS_ARCOUNT_SET(wirebuf, i) (sldns_write_uint16(wirebuf+LDNS_ARCOUNT_OFF, i)) 116 117 /** 118 * The sections of a packet 119 */ 120 enum sldns_enum_pkt_section { 121 LDNS_SECTION_QUESTION = 0, 122 LDNS_SECTION_ANSWER = 1, 123 LDNS_SECTION_AUTHORITY = 2, 124 LDNS_SECTION_ADDITIONAL = 3, 125 /** bogus section, if not interested */ 126 LDNS_SECTION_ANY = 4, 127 /** used to get all non-question rrs from a packet */ 128 LDNS_SECTION_ANY_NOQUESTION = 5 129 }; 130 typedef enum sldns_enum_pkt_section sldns_pkt_section; 131 132 /* opcodes for pkt's */ 133 enum sldns_enum_pkt_opcode { 134 LDNS_PACKET_QUERY = 0, 135 LDNS_PACKET_IQUERY = 1, 136 LDNS_PACKET_STATUS = 2, /* there is no 3?? DNS is weird */ 137 LDNS_PACKET_NOTIFY = 4, 138 LDNS_PACKET_UPDATE = 5 139 }; 140 typedef enum sldns_enum_pkt_opcode sldns_pkt_opcode; 141 142 /* rcodes for pkts */ 143 enum sldns_enum_pkt_rcode { 144 LDNS_RCODE_NOERROR = 0, 145 LDNS_RCODE_FORMERR = 1, 146 LDNS_RCODE_SERVFAIL = 2, 147 LDNS_RCODE_NXDOMAIN = 3, 148 LDNS_RCODE_NOTIMPL = 4, 149 LDNS_RCODE_REFUSED = 5, 150 LDNS_RCODE_YXDOMAIN = 6, 151 LDNS_RCODE_YXRRSET = 7, 152 LDNS_RCODE_NXRRSET = 8, 153 LDNS_RCODE_NOTAUTH = 9, 154 LDNS_RCODE_NOTZONE = 10 155 }; 156 typedef enum sldns_enum_pkt_rcode sldns_pkt_rcode; 157 158 #ifdef __cplusplus 159 } 160 #endif 161 162 #endif /* LDNS_PKTHDR_H */ 163
Indexes created Sun Mar 01 05:31:48 UTC 2026