| 1 | /*
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| 2 | * Copyright (c) 2012 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup dnsres
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file DNS Standard definitions.
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| 34 | *
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| 35 | * From RFC 1035 Domain Names - Implementation and Specification
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| 36 | */
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| 37 |
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| 38 | #ifndef DNS_STD_H
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| 39 | #define DNS_STD_H
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| 40 |
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| 41 | #include <stdint.h>
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| 42 |
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| 43 | /** From 2.3.4. Size Limits */
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| 44 | enum dns_limits {
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| 45 | DNS_LABEL_MAX_SIZE = 63,
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| 46 | DNS_NAME_MAX_SIZE = 255,
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| 47 | DNS_UDP_MSG_MAX_SIZE = 512
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| 48 | };
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| 49 |
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| 50 | typedef enum dns_qtype {
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| 51 | DTYPE_A = 1,
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| 52 | DTYPE_NS = 2,
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| 53 | DTYPE_MD = 3,
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| 54 | DTYPE_MF = 4,
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| 55 | DTYPE_CNAME = 5,
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| 56 | DTYPE_SOA = 6,
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| 57 | DTYPE_MB = 7,
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| 58 | DTYPE_MG = 8,
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| 59 | DTYPE_MR = 9,
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| 60 | DTYPE_NULL = 10,
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| 61 | DTYPE_WKS = 11,
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| 62 | DTYPE_PTR = 12,
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| 63 | DTYPE_HINFO = 13,
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| 64 | DTYPE_MINFO = 14,
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| 65 | DTYPE_MX = 15,
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| 66 | DTYPE_TXT = 16,
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| 67 | DQTYPE_AXFR = 252,
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| 68 | DQTYPE_MAILB = 253,
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| 69 | DQTYPE_MAILA = 254,
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| 70 | DQTYPE_ALL = 255
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| 71 | } dns_type_t, dns_qtype_t;
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| 72 |
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| 73 | typedef enum dns_qclass {
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| 74 | /** Internet */
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| 75 | DC_IN = 1,
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| 76 | /** CSNET */
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| 77 | DC_CS = 2,
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| 78 | /** CHAOS */
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| 79 | DC_CH = 3,
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| 80 | /** Hesiod */
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| 81 | DC_HS = 4,
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| 82 | /** Any class */
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| 83 | DQC_ANY = 255
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| 84 | } dns_class_t, dns_qclass_t;
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| 85 |
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| 86 | typedef struct {
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| 87 | /** Identifier assigned by the query originator */
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| 88 | uint16_t id;
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| 89 | /** QR, Opcode, AA, TC,RD, RA, Z, Rcode */
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| 90 | uint16_t opbits;
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| 91 | /** Number of entries in query section */
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| 92 | uint16_t qd_count;
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| 93 | /** Number of RRs in the answer section */
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| 94 | uint16_t an_count;
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| 95 | /** Number of name server RRs in the authority records section */
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| 96 | uint16_t ns_count;
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| 97 | /** Number of RRs in the additional records section */
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| 98 | uint16_t ar_count;
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| 99 | } dns_header_t;
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| 100 |
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| 101 | /** Bits in dns_header_t.opbits.
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| 102 | *
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| 103 | * Note that bit numbers in RFC 1035 are reversed (0 is the most significant)
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| 104 | * but we use the standard notation (0 is the least significant).
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| 105 | */
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| 106 | enum dns_opbits {
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| 107 | OPB_QR = 15,
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| 108 | OPB_OPCODE_h = 14,
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| 109 | OPB_OPCODE_l = 11,
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| 110 | OPB_AA = 10,
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| 111 | OPB_TC = 9,
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| 112 | OPB_RD = 8,
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| 113 | OPB_RA = 7,
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| 114 | OPB_Z_h = 6,
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| 115 | OPB_Z_l = 4,
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| 116 | OPB_RCODE_h = 3,
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| 117 | OPB_RCODE_l = 0
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| 118 | };
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| 119 |
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| 120 | typedef enum dns_query_response {
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| 121 | QR_QUERY = 0,
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| 122 | QR_RESPONSE = 1
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| 123 | } dns_query_response_t;
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| 124 |
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| 125 | typedef enum dns_opcode {
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| 126 | OPC_QUERY = 0,
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| 127 | OPC_IQUERY = 1,
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| 128 | OPC_STATUS = 2
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| 129 | } dns_opcode_t;
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| 130 |
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| 131 | typedef enum dns_rcode {
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| 132 | RC_OK = 0,
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| 133 | RC_FMT_ERR = 1,
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| 134 | RC_SRV_FAIL = 2,
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| 135 | RC_NAME_ERR = 3,
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| 136 | RC_NOT_IMPL = 4,
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| 137 | RC_REFUSED = 5
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| 138 | } dns_rcode_t;
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| 139 |
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| 140 | #endif
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| 141 |
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| 142 | /** @}
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| 143 | */
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