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annotate CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/ares_dns.h @ 69:33d812a61356

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planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d
author jpayne
date Tue, 18 Mar 2025 17:55:14 -0400
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jpayne@69 1 /* MIT License
jpayne@69 2 *
jpayne@69 3 * Copyright (c) Massachusetts Institute of Technology
jpayne@69 4 * Copyright (c) The c-ares project and its contributors
jpayne@69 5 *
jpayne@69 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
jpayne@69 7 * of this software and associated documentation files (the "Software"), to deal
jpayne@69 8 * in the Software without restriction, including without limitation the rights
jpayne@69 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
jpayne@69 10 * copies of the Software, and to permit persons to whom the Software is
jpayne@69 11 * furnished to do so, subject to the following conditions:
jpayne@69 12 *
jpayne@69 13 * The above copyright notice and this permission notice (including the next
jpayne@69 14 * paragraph) shall be included in all copies or substantial portions of the
jpayne@69 15 * Software.
jpayne@69 16 *
jpayne@69 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jpayne@69 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jpayne@69 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
jpayne@69 20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jpayne@69 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
jpayne@69 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
jpayne@69 23 * SOFTWARE.
jpayne@69 24 *
jpayne@69 25 * SPDX-License-Identifier: MIT
jpayne@69 26 */
jpayne@69 27 #ifndef HEADER_CARES_DNS_H
jpayne@69 28 #define HEADER_CARES_DNS_H
jpayne@69 29
jpayne@69 30 /*
jpayne@69 31 * NOTE TO INTEGRATORS:
jpayne@69 32 *
jpayne@69 33 * This header is made public due to legacy projects relying on it.
jpayne@69 34 * Please do not use the macros within this header, or include this
jpayne@69 35 * header in your project as it may be removed in the future.
jpayne@69 36 */
jpayne@69 37
jpayne@69 38
jpayne@69 39 /*
jpayne@69 40 * Macro DNS__16BIT reads a network short (16 bit) given in network
jpayne@69 41 * byte order, and returns its value as an unsigned short.
jpayne@69 42 */
jpayne@69 43 #define DNS__16BIT(p) \
jpayne@69 44 ((unsigned short)((unsigned int)0xffff & \
jpayne@69 45 (((unsigned int)((unsigned char)(p)[0]) << 8U) | \
jpayne@69 46 ((unsigned int)((unsigned char)(p)[1])))))
jpayne@69 47
jpayne@69 48 /*
jpayne@69 49 * Macro DNS__32BIT reads a network long (32 bit) given in network
jpayne@69 50 * byte order, and returns its value as an unsigned int.
jpayne@69 51 */
jpayne@69 52 #define DNS__32BIT(p) \
jpayne@69 53 ((unsigned int)(((unsigned int)((unsigned char)(p)[0]) << 24U) | \
jpayne@69 54 ((unsigned int)((unsigned char)(p)[1]) << 16U) | \
jpayne@69 55 ((unsigned int)((unsigned char)(p)[2]) << 8U) | \
jpayne@69 56 ((unsigned int)((unsigned char)(p)[3]))))
jpayne@69 57
jpayne@69 58 #define DNS__SET16BIT(p, v) \
jpayne@69 59 (((p)[0] = (unsigned char)(((v) >> 8) & 0xff)), \
jpayne@69 60 ((p)[1] = (unsigned char)((v) & 0xff)))
jpayne@69 61 #define DNS__SET32BIT(p, v) \
jpayne@69 62 (((p)[0] = (unsigned char)(((v) >> 24) & 0xff)), \
jpayne@69 63 ((p)[1] = (unsigned char)(((v) >> 16) & 0xff)), \
jpayne@69 64 ((p)[2] = (unsigned char)(((v) >> 8) & 0xff)), \
jpayne@69 65 ((p)[3] = (unsigned char)((v) & 0xff)))
jpayne@69 66
jpayne@69 67 #if 0
jpayne@69 68 /* we cannot use this approach on systems where we can't access 16/32 bit
jpayne@69 69 data on un-aligned addresses */
jpayne@69 70 # define DNS__16BIT(p) ntohs(*(unsigned short *)(p))
jpayne@69 71 # define DNS__32BIT(p) ntohl(*(unsigned long *)(p))
jpayne@69 72 # define DNS__SET16BIT(p, v) *(unsigned short *)(p) = htons(v)
jpayne@69 73 # define DNS__SET32BIT(p, v) *(unsigned long *)(p) = htonl(v)
jpayne@69 74 #endif
jpayne@69 75
jpayne@69 76 /* Macros for parsing a DNS header */
jpayne@69 77 #define DNS_HEADER_QID(h) DNS__16BIT(h)
jpayne@69 78 #define DNS_HEADER_QR(h) (((h)[2] >> 7) & 0x1)
jpayne@69 79 #define DNS_HEADER_OPCODE(h) (((h)[2] >> 3) & 0xf)
jpayne@69 80 #define DNS_HEADER_AA(h) (((h)[2] >> 2) & 0x1)
jpayne@69 81 #define DNS_HEADER_TC(h) (((h)[2] >> 1) & 0x1)
jpayne@69 82 #define DNS_HEADER_RD(h) ((h)[2] & 0x1)
jpayne@69 83 #define DNS_HEADER_RA(h) (((h)[3] >> 7) & 0x1)
jpayne@69 84 #define DNS_HEADER_Z(h) (((h)[3] >> 4) & 0x7)
jpayne@69 85 #define DNS_HEADER_RCODE(h) ((h)[3] & 0xf)
jpayne@69 86 #define DNS_HEADER_QDCOUNT(h) DNS__16BIT((h) + 4)
jpayne@69 87 #define DNS_HEADER_ANCOUNT(h) DNS__16BIT((h) + 6)
jpayne@69 88 #define DNS_HEADER_NSCOUNT(h) DNS__16BIT((h) + 8)
jpayne@69 89 #define DNS_HEADER_ARCOUNT(h) DNS__16BIT((h) + 10)
jpayne@69 90
jpayne@69 91 /* Macros for constructing a DNS header */
jpayne@69 92 #define DNS_HEADER_SET_QID(h, v) DNS__SET16BIT(h, v)
jpayne@69 93 #define DNS_HEADER_SET_QR(h, v) ((h)[2] |= (unsigned char)(((v) & 0x1) << 7))
jpayne@69 94 #define DNS_HEADER_SET_OPCODE(h, v) \
jpayne@69 95 ((h)[2] |= (unsigned char)(((v) & 0xf) << 3))
jpayne@69 96 #define DNS_HEADER_SET_AA(h, v) ((h)[2] |= (unsigned char)(((v) & 0x1) << 2))
jpayne@69 97 #define DNS_HEADER_SET_TC(h, v) ((h)[2] |= (unsigned char)(((v) & 0x1) << 1))
jpayne@69 98 #define DNS_HEADER_SET_RD(h, v) ((h)[2] |= (unsigned char)((v) & 0x1))
jpayne@69 99 #define DNS_HEADER_SET_RA(h, v) ((h)[3] |= (unsigned char)(((v) & 0x1) << 7))
jpayne@69 100 #define DNS_HEADER_SET_Z(h, v) ((h)[3] |= (unsigned char)(((v) & 0x7) << 4))
jpayne@69 101 #define DNS_HEADER_SET_RCODE(h, v) ((h)[3] |= (unsigned char)((v) & 0xf))
jpayne@69 102 #define DNS_HEADER_SET_QDCOUNT(h, v) DNS__SET16BIT((h) + 4, v)
jpayne@69 103 #define DNS_HEADER_SET_ANCOUNT(h, v) DNS__SET16BIT((h) + 6, v)
jpayne@69 104 #define DNS_HEADER_SET_NSCOUNT(h, v) DNS__SET16BIT((h) + 8, v)
jpayne@69 105 #define DNS_HEADER_SET_ARCOUNT(h, v) DNS__SET16BIT((h) + 10, v)
jpayne@69 106
jpayne@69 107 /* Macros for parsing the fixed part of a DNS question */
jpayne@69 108 #define DNS_QUESTION_TYPE(q) DNS__16BIT(q)
jpayne@69 109 #define DNS_QUESTION_CLASS(q) DNS__16BIT((q) + 2)
jpayne@69 110
jpayne@69 111 /* Macros for constructing the fixed part of a DNS question */
jpayne@69 112 #define DNS_QUESTION_SET_TYPE(q, v) DNS__SET16BIT(q, v)
jpayne@69 113 #define DNS_QUESTION_SET_CLASS(q, v) DNS__SET16BIT((q) + 2, v)
jpayne@69 114
jpayne@69 115 /* Macros for parsing the fixed part of a DNS resource record */
jpayne@69 116 #define DNS_RR_TYPE(r) DNS__16BIT(r)
jpayne@69 117 #define DNS_RR_CLASS(r) DNS__16BIT((r) + 2)
jpayne@69 118 #define DNS_RR_TTL(r) DNS__32BIT((r) + 4)
jpayne@69 119 #define DNS_RR_LEN(r) DNS__16BIT((r) + 8)
jpayne@69 120
jpayne@69 121 /* Macros for constructing the fixed part of a DNS resource record */
jpayne@69 122 #define DNS_RR_SET_TYPE(r, v) DNS__SET16BIT(r, v)
jpayne@69 123 #define DNS_RR_SET_CLASS(r, v) DNS__SET16BIT((r) + 2, v)
jpayne@69 124 #define DNS_RR_SET_TTL(r, v) DNS__SET32BIT((r) + 4, v)
jpayne@69 125 #define DNS_RR_SET_LEN(r, v) DNS__SET16BIT((r) + 8, v)
jpayne@69 126
jpayne@69 127 #endif /* HEADER_CARES_DNS_H */