mx_15.c

Go to the documentation of this file.

/*
 * Copyright (C) 2004, 2005, 2007, 2009, 2012  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1998-2001, 2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/* $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>

#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 == 15);

        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);
        origin = (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 == 15);
        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);
        sprintf(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 == 15);

        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 == 15);
        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 == 15);
        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 == 15);
        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 == 15);
        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 == 15);

        if (mx->mctx == NULL)
                return;

        dns_name_free(&mx->mx, mx->mctx);
        mx->mctx = NULL;
}

static inline isc_result_t
additionaldata_mx(ARGS_ADDLDATA) {
        dns_name_t name;
        dns_offsets_t offsets;
        isc_region_t region;

        REQUIRE(rdata->type == 15);

        dns_name_init(&name, offsets);
        dns_rdata_toregion(rdata, &region);
        isc_region_consume(&region, 2);
        dns_name_fromregion(&name, &region);

        return ((add)(arg, &name, dns_rdatatype_a));
}

static inline isc_result_t
digest_mx(ARGS_DIGEST) {
        isc_region_t r1, r2;
        dns_name_t name;

        REQUIRE(rdata->type == 15);

        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 == 15);

        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 == 15);

        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 */

---