1 /* 2 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 14 * PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 /* $Id: a6_38.c,v 1.14 2020/09/14 08:40:44 florian Exp $ */ 18 19 /* RFC2874 */ 20 21 #ifndef RDATA_IN_1_A6_28_C 22 #define RDATA_IN_1_A6_28_C 23 24 static inline isc_result_t 25 totext_in_a6(ARGS_TOTEXT) { 26 isc_region_t sr, ar; 27 unsigned char addr[16]; 28 unsigned char prefixlen; 29 unsigned char octets; 30 unsigned char mask; 31 char buf[sizeof("128")]; 32 dns_name_t name; 33 dns_name_t prefix; 34 int sub; 35 36 REQUIRE(rdata->type == dns_rdatatype_a6); 37 REQUIRE(rdata->rdclass == dns_rdataclass_in); 38 REQUIRE(rdata->length != 0); 39 40 dns_rdata_toregion(rdata, &sr); 41 prefixlen = sr.base[0]; 42 INSIST(prefixlen <= 128); 43 isc_region_consume(&sr, 1); 44 snprintf(buf, sizeof(buf), "%u", prefixlen); 45 RETERR(isc_str_tobuffer(buf, target)); 46 RETERR(isc_str_tobuffer(" ", target)); 47 48 if (prefixlen != 128) { 49 octets = prefixlen/8; 50 memset(addr, 0, sizeof(addr)); 51 memmove(&addr[octets], sr.base, 16 - octets); 52 mask = 0xff >> (prefixlen % 8); 53 addr[octets] &= mask; 54 ar.base = addr; 55 ar.length = sizeof(addr); 56 RETERR(inet_totext(AF_INET6, &ar, target)); 57 isc_region_consume(&sr, 16 - octets); 58 } 59 60 if (prefixlen == 0) 61 return (ISC_R_SUCCESS); 62 63 RETERR(isc_str_tobuffer(" ", target)); 64 dns_name_init(&name, NULL); 65 dns_name_init(&prefix, NULL); 66 dns_name_fromregion(&name, &sr); 67 sub = name_prefix(&name, tctx->origin, &prefix); 68 return (dns_name_totext(&prefix, sub, target)); 69 } 70 71 static inline isc_result_t 72 fromwire_in_a6(ARGS_FROMWIRE) { 73 isc_region_t sr; 74 unsigned char prefixlen; 75 unsigned char octets; 76 unsigned char mask; 77 dns_name_t name; 78 79 REQUIRE(type == dns_rdatatype_a6); 80 REQUIRE(rdclass == dns_rdataclass_in); 81 82 UNUSED(type); 83 UNUSED(rdclass); 84 85 dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE); 86 87 isc_buffer_activeregion(source, &sr); 88 /* 89 * Prefix length. 90 */ 91 if (sr.length < 1) 92 return (ISC_R_UNEXPECTEDEND); 93 prefixlen = sr.base[0]; 94 if (prefixlen > 128) 95 return (ISC_R_RANGE); 96 isc_region_consume(&sr, 1); 97 RETERR(isc_mem_tobuffer(target, &prefixlen, 1)); 98 isc_buffer_forward(source, 1); 99 100 /* 101 * Suffix. 102 */ 103 if (prefixlen != 128) { 104 octets = 16 - prefixlen / 8; 105 if (sr.length < octets) 106 return (ISC_R_UNEXPECTEDEND); 107 mask = 0xff >> (prefixlen % 8); 108 sr.base[0] &= mask; /* Ensure pad bits are zero. */ 109 RETERR(isc_mem_tobuffer(target, sr.base, octets)); 110 isc_buffer_forward(source, octets); 111 } 112 113 if (prefixlen == 0) 114 return (ISC_R_SUCCESS); 115 116 dns_name_init(&name, NULL); 117 return (dns_name_fromwire(&name, source, dctx, options, target)); 118 } 119 120 static inline isc_result_t 121 towire_in_a6(ARGS_TOWIRE) { 122 isc_region_t sr; 123 dns_name_t name; 124 dns_offsets_t offsets; 125 unsigned char prefixlen; 126 unsigned char octets; 127 128 REQUIRE(rdata->type == dns_rdatatype_a6); 129 REQUIRE(rdata->rdclass == dns_rdataclass_in); 130 REQUIRE(rdata->length != 0); 131 132 dns_compress_setmethods(cctx, DNS_COMPRESS_NONE); 133 dns_rdata_toregion(rdata, &sr); 134 prefixlen = sr.base[0]; 135 INSIST(prefixlen <= 128); 136 137 octets = 1 + 16 - prefixlen / 8; 138 RETERR(isc_mem_tobuffer(target, sr.base, octets)); 139 isc_region_consume(&sr, octets); 140 141 if (prefixlen == 0) 142 return (ISC_R_SUCCESS); 143 144 dns_name_init(&name, offsets); 145 dns_name_fromregion(&name, &sr); 146 return (dns_name_towire(&name, cctx, target)); 147 } 148 149 #endif /* RDATA_IN_1_A6_38_C */ 150