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-rw-r--r--lib/dns/rdata/generic/mx_15.c356
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
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+++ 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, &region);
+ num = uint16_fromregion(&region);
+ isc_region_consume(&region, 2);
+ snprintf(buf, sizeof(buf), "%u", num);
+ RETERR(str_totext(buf, target));
+
+ RETERR(str_totext(" ", target));
+
+ dns_name_fromregion(&name, &region);
+ 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, &region);
+ RETERR(mem_tobuffer(target, region.base, 2));
+ isc_region_consume(&region, 2);
+
+ dns_name_init(&name, offsets);
+ dns_name_fromregion(&name, &region);
+
+ 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, &region1);
+ dns_rdata_toregion(rdata2, &region2);
+
+ isc_region_consume(&region1, 2);
+ isc_region_consume(&region2, 2);
+
+ dns_name_fromregion(&name1, &region1);
+ dns_name_fromregion(&name2, &region2);
+
+ 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, &region);
+ return (isc_buffer_copyregion(target, &region));
+}
+
+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, &region);
+ mx->pref = uint16_fromregion(&region);
+ isc_region_consume(&region, 2);
+ dns_name_fromregion(&name, &region);
+ 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, &region);
+ isc_region_consume(&region, 2);
+ dns_name_fromregion(&name, &region);
+
+ 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, &region);
+ isc_region_consume(&region, 2);
+ dns_name_init(&name, NULL);
+ dns_name_fromregion(&name, &region);
+ 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 */