rdata/generic/mx_15.c

	mx_15.c revision ad1317338af79edad878c9c3e4361798503310ba
/*
 * Copyright (C) 1998-2001, 2003-2005, 2007, 2009, 2012, 2015, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 http://mozilla.org/MPL/2.0/.
 */

/* $Id: mx_15.c,v 1.58 2009/12/04 22:06:37 tbox Exp $ */

/* reviewed: Wed Mar 15 18:05:46 PST 2000 by brister */

#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 isc_boolean_t
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 (ISC_TRUE);

    if (tmp[strlen(tmp) - 1] == '.')
        tmp[strlen(tmp) - 1] = '\0';
    if (inet_aton(tmp, &addr) == 1 ||
        inet_pton(AF_INET6, tmp, &addr6) == 1)
        return (ISC_FALSE);

    return (ISC_TRUE);
}

static inline isc_result_t
fromtext_mx(ARGS_FROMTEXT) {
    isc_token_t token;
    dns_name_t name;
    isc_buffer_t buffer;
    isc_boolean_t ok;

    REQUIRE(type == dns_rdatatype_mx);

    UNUSED(type);
    UNUSED(rdclass);

    RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
                      ISC_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,
                      ISC_FALSE));

    ok = ISC_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 = ISC_TRUE;
    if ((options & DNS_RDATA_CHECKNAMES) != 0)
        ok = dns_name_ishostname(&name, ISC_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 inline isc_result_t
totext_mx(ARGS_TOTEXT) {
    isc_region_t region;
    dns_name_t name;
    dns_name_t prefix;
    isc_boolean_t 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 inline 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 inline 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 inline 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 inline isc_result_t
fromstruct_mx(ARGS_FROMSTRUCT) {
    dns_rdata_mx_t *mx = source;
    isc_region_t region;

    REQUIRE(type == dns_rdatatype_mx);
    REQUIRE(source != 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 inline 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(target != 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 inline void
freestruct_mx(ARGS_FREESTRUCT) {
    dns_rdata_mx_t *mx = source;

    REQUIRE(source != 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 inline 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 inline 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 inline isc_boolean_t
checkowner_mx(ARGS_CHECKOWNER) {

    REQUIRE(type == dns_rdatatype_mx);

    UNUSED(type);
    UNUSED(rdclass);

    return (dns_name_ishostname(name, wildcard));
}

static inline isc_boolean_t
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, ISC_FALSE)) {
        if (bad != NULL)
            dns_name_clone(&name, bad);
        return (ISC_FALSE);
    }
    return (ISC_TRUE);
}

static inline int
casecompare_mx(ARGS_COMPARE) {
    return (compare_mx(rdata1, rdata2));
}

#endif  /* RDATA_GENERIC_MX_15_C */