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Diffstat (limited to '')
| -rw-r--r-- | lib/dns/rdata/generic/mx_15.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/lib/dns/rdata/generic/mx_15.c b/lib/dns/rdata/generic/mx_15.c new file mode 100644 index 0000000..ff6637c --- /dev/null +++ b/lib/dns/rdata/generic/mx_15.c @@ -0,0 +1,356 @@ +/* + * 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 <string.h> + +#include <isc/net.h> + +#include <dns/fixedname.h> + +#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); + RETERR(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); + + 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); + 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)); +} + +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 */ |