/* $NetBSD: mx_15.c,v 1.7.2.1 2024/02/25 15:47:03 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef RDATA_GENERIC_MX_15_C #define RDATA_GENERIC_MX_15_C #include #include #include #define RRTYPE_MX_ATTRIBUTES (0) static bool check_mx(isc_token_t *token) { char tmp[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:123.123.123.123.")]; struct in_addr addr; struct in6_addr addr6; if (strlcpy(tmp, DNS_AS_STR(*token), sizeof(tmp)) >= sizeof(tmp)) { return (true); } if (tmp[strlen(tmp) - 1] == '.') { tmp[strlen(tmp) - 1] = '\0'; } if (inet_pton(AF_INET, tmp, &addr) == 1 || inet_pton(AF_INET6, tmp, &addr6) == 1) { return (false); } return (true); } static isc_result_t fromtext_mx(ARGS_FROMTEXT) { isc_token_t token; dns_name_t name; isc_buffer_t buffer; bool ok; REQUIRE(type == dns_rdatatype_mx); UNUSED(type); UNUSED(rdclass); RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number, false)); if (token.value.as_ulong > 0xffffU) { RETTOK(ISC_R_RANGE); } RETERR(uint16_tobuffer(token.value.as_ulong, target)); RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, false)); ok = true; if ((options & DNS_RDATA_CHECKMX) != 0) { ok = check_mx(&token); } if (!ok && (options & DNS_RDATA_CHECKMXFAIL) != 0) { RETTOK(DNS_R_MXISADDRESS); } if (!ok && callbacks != NULL) { warn_badmx(&token, lexer, callbacks); } dns_name_init(&name, NULL); buffer_fromregion(&buffer, &token.value.as_region); if (origin == NULL) { origin = dns_rootname; } RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target)); ok = true; if ((options & DNS_RDATA_CHECKNAMES) != 0) { ok = dns_name_ishostname(&name, false); } if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0) { RETTOK(DNS_R_BADNAME); } if (!ok && callbacks != NULL) { warn_badname(&name, lexer, callbacks); } return (ISC_R_SUCCESS); } static isc_result_t totext_mx(ARGS_TOTEXT) { isc_region_t region; dns_name_t name; dns_name_t prefix; bool sub; char buf[sizeof("64000")]; unsigned short num; REQUIRE(rdata->type == dns_rdatatype_mx); REQUIRE(rdata->length != 0); dns_name_init(&name, NULL); dns_name_init(&prefix, NULL); dns_rdata_toregion(rdata, ®ion); num = uint16_fromregion(®ion); isc_region_consume(®ion, 2); snprintf(buf, sizeof(buf), "%u", num); RETERR(str_totext(buf, target)); RETERR(str_totext(" ", target)); dns_name_fromregion(&name, ®ion); sub = name_prefix(&name, tctx->origin, &prefix); return (dns_name_totext(&prefix, sub, target)); } static isc_result_t fromwire_mx(ARGS_FROMWIRE) { dns_name_t name; isc_region_t sregion; REQUIRE(type == dns_rdatatype_mx); UNUSED(type); UNUSED(rdclass); dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14); dns_name_init(&name, NULL); isc_buffer_activeregion(source, &sregion); if (sregion.length < 2) { return (ISC_R_UNEXPECTEDEND); } RETERR(mem_tobuffer(target, sregion.base, 2)); isc_buffer_forward(source, 2); return (dns_name_fromwire(&name, source, dctx, options, target)); } static isc_result_t towire_mx(ARGS_TOWIRE) { dns_name_t name; dns_offsets_t offsets; isc_region_t region; REQUIRE(rdata->type == dns_rdatatype_mx); REQUIRE(rdata->length != 0); dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14); dns_rdata_toregion(rdata, ®ion); RETERR(mem_tobuffer(target, region.base, 2)); isc_region_consume(®ion, 2); dns_name_init(&name, offsets); dns_name_fromregion(&name, ®ion); return (dns_name_towire(&name, cctx, target)); } static int compare_mx(ARGS_COMPARE) { dns_name_t name1; dns_name_t name2; isc_region_t region1; isc_region_t region2; int order; REQUIRE(rdata1->type == rdata2->type); REQUIRE(rdata1->rdclass == rdata2->rdclass); REQUIRE(rdata1->type == dns_rdatatype_mx); REQUIRE(rdata1->length != 0); REQUIRE(rdata2->length != 0); order = memcmp(rdata1->data, rdata2->data, 2); if (order != 0) { return (order < 0 ? -1 : 1); } dns_name_init(&name1, NULL); dns_name_init(&name2, NULL); dns_rdata_toregion(rdata1, ®ion1); dns_rdata_toregion(rdata2, ®ion2); isc_region_consume(®ion1, 2); isc_region_consume(®ion2, 2); dns_name_fromregion(&name1, ®ion1); dns_name_fromregion(&name2, ®ion2); return (dns_name_rdatacompare(&name1, &name2)); } static isc_result_t fromstruct_mx(ARGS_FROMSTRUCT) { dns_rdata_mx_t *mx = source; isc_region_t region; REQUIRE(type == dns_rdatatype_mx); REQUIRE(mx != NULL); REQUIRE(mx->common.rdtype == type); REQUIRE(mx->common.rdclass == rdclass); UNUSED(type); UNUSED(rdclass); RETERR(uint16_tobuffer(mx->pref, target)); dns_name_toregion(&mx->mx, ®ion); return (isc_buffer_copyregion(target, ®ion)); } static isc_result_t tostruct_mx(ARGS_TOSTRUCT) { isc_region_t region; dns_rdata_mx_t *mx = target; dns_name_t name; REQUIRE(rdata->type == dns_rdatatype_mx); REQUIRE(mx != NULL); REQUIRE(rdata->length != 0); mx->common.rdclass = rdata->rdclass; mx->common.rdtype = rdata->type; ISC_LINK_INIT(&mx->common, link); dns_name_init(&name, NULL); dns_rdata_toregion(rdata, ®ion); mx->pref = uint16_fromregion(®ion); isc_region_consume(®ion, 2); dns_name_fromregion(&name, ®ion); dns_name_init(&mx->mx, NULL); name_duporclone(&name, mctx, &mx->mx); mx->mctx = mctx; return (ISC_R_SUCCESS); } static void freestruct_mx(ARGS_FREESTRUCT) { dns_rdata_mx_t *mx = source; REQUIRE(mx != NULL); REQUIRE(mx->common.rdtype == dns_rdatatype_mx); if (mx->mctx == NULL) { return; } dns_name_free(&mx->mx, mx->mctx); mx->mctx = NULL; } static unsigned char port25_offset[] = { 0, 3 }; static unsigned char port25_ndata[] = "\003_25\004_tcp"; static dns_name_t port25 = DNS_NAME_INITNONABSOLUTE(port25_ndata, port25_offset); static isc_result_t additionaldata_mx(ARGS_ADDLDATA) { isc_result_t result; dns_fixedname_t fixed; dns_name_t name; dns_offsets_t offsets; isc_region_t region; REQUIRE(rdata->type == dns_rdatatype_mx); UNUSED(owner); dns_name_init(&name, offsets); dns_rdata_toregion(rdata, ®ion); isc_region_consume(®ion, 2); dns_name_fromregion(&name, ®ion); if (dns_name_equal(&name, dns_rootname)) { return (ISC_R_SUCCESS); } result = (add)(arg, &name, dns_rdatatype_a, NULL); if (result != ISC_R_SUCCESS) { return (result); } dns_fixedname_init(&fixed); result = dns_name_concatenate(&port25, &name, dns_fixedname_name(&fixed), NULL); if (result != ISC_R_SUCCESS) { return (ISC_R_SUCCESS); } return ((add)(arg, dns_fixedname_name(&fixed), dns_rdatatype_tlsa, NULL)); } static isc_result_t digest_mx(ARGS_DIGEST) { isc_region_t r1, r2; dns_name_t name; REQUIRE(rdata->type == dns_rdatatype_mx); dns_rdata_toregion(rdata, &r1); r2 = r1; isc_region_consume(&r2, 2); r1.length = 2; RETERR((digest)(arg, &r1)); dns_name_init(&name, NULL); dns_name_fromregion(&name, &r2); return (dns_name_digest(&name, digest, arg)); } static bool checkowner_mx(ARGS_CHECKOWNER) { REQUIRE(type == dns_rdatatype_mx); UNUSED(type); UNUSED(rdclass); return (dns_name_ishostname(name, wildcard)); } static bool checknames_mx(ARGS_CHECKNAMES) { isc_region_t region; dns_name_t name; REQUIRE(rdata->type == dns_rdatatype_mx); UNUSED(owner); dns_rdata_toregion(rdata, ®ion); isc_region_consume(®ion, 2); dns_name_init(&name, NULL); dns_name_fromregion(&name, ®ion); if (!dns_name_ishostname(&name, false)) { if (bad != NULL) { dns_name_clone(&name, bad); } return (false); } return (true); } static int casecompare_mx(ARGS_COMPARE) { return (compare_mx(rdata1, rdata2)); } #endif /* RDATA_GENERIC_MX_15_C */