cname_5.c

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/*
 * Copyright (C) 2004, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1998-2001  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: cname_5.c,v 1.49 2009/12/04 22:06:37 tbox Exp $ */

/* reviewed: Wed Mar 15 16:48:45 PST 2000 by brister */

#ifndef RDATA_GENERIC_CNAME_5_C
#define RDATA_GENERIC_CNAME_5_C

#define RRTYPE_CNAME_ATTRIBUTES \
        (DNS_RDATATYPEATTR_EXCLUSIVE | DNS_RDATATYPEATTR_SINGLETON)

static inline isc_result_t
fromtext_cname(ARGS_FROMTEXT) {
        isc_token_t token;
        dns_name_t name;
        isc_buffer_t buffer;

        REQUIRE(type == 5);

        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(callbacks);

        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                                      ISC_FALSE));

        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));
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
totext_cname(ARGS_TOTEXT) {
        isc_region_t region;
        dns_name_t name;
        dns_name_t prefix;
        isc_boolean_t sub;

        REQUIRE(rdata->type == 5);
        REQUIRE(rdata->length != 0);

        dns_name_init(&name, NULL);
        dns_name_init(&prefix, NULL);

        dns_rdata_toregion(rdata, &region);
        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_cname(ARGS_FROMWIRE) {
        dns_name_t name;

        REQUIRE(type == 5);

        UNUSED(type);
        UNUSED(rdclass);

        dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);

        dns_name_init(&name, NULL);
        return (dns_name_fromwire(&name, source, dctx, options, target));
}

static inline isc_result_t
towire_cname(ARGS_TOWIRE) {
        dns_name_t name;
        dns_offsets_t offsets;
        isc_region_t region;

        REQUIRE(rdata->type == 5);
        REQUIRE(rdata->length != 0);

        dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);

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

        return (dns_name_towire(&name, cctx, target));
}

static inline int
compare_cname(ARGS_COMPARE) {
        dns_name_t name1;
        dns_name_t name2;
        isc_region_t region1;
        isc_region_t region2;

        REQUIRE(rdata1->type == rdata2->type);
        REQUIRE(rdata1->rdclass == rdata2->rdclass);
        REQUIRE(rdata1->type == 5);
        REQUIRE(rdata1->length != 0);
        REQUIRE(rdata2->length != 0);

        dns_name_init(&name1, NULL);
        dns_name_init(&name2, NULL);

        dns_rdata_toregion(rdata1, &region1);
        dns_rdata_toregion(rdata2, &region2);

        dns_name_fromregion(&name1, &region1);
        dns_name_fromregion(&name2, &region2);

        return (dns_name_rdatacompare(&name1, &name2));
}

static inline isc_result_t
fromstruct_cname(ARGS_FROMSTRUCT) {
        dns_rdata_cname_t *cname = source;
        isc_region_t region;

        REQUIRE(type == 5);
        REQUIRE(source != NULL);
        REQUIRE(cname->common.rdtype == type);
        REQUIRE(cname->common.rdclass == rdclass);

        UNUSED(type);
        UNUSED(rdclass);

        dns_name_toregion(&cname->cname, &region);
        return (isc_buffer_copyregion(target, &region));
}

static inline isc_result_t
tostruct_cname(ARGS_TOSTRUCT) {
        isc_region_t region;
        dns_rdata_cname_t *cname = target;
        dns_name_t name;

        REQUIRE(rdata->type == 5);
        REQUIRE(target != NULL);
        REQUIRE(rdata->length != 0);

        cname->common.rdclass = rdata->rdclass;
        cname->common.rdtype = rdata->type;
        ISC_LINK_INIT(&cname->common, link);

        dns_name_init(&name, NULL);
        dns_rdata_toregion(rdata, &region);
        dns_name_fromregion(&name, &region);
        dns_name_init(&cname->cname, NULL);
        RETERR(name_duporclone(&name, mctx, &cname->cname));
        cname->mctx = mctx;
        return (ISC_R_SUCCESS);
}

static inline void
freestruct_cname(ARGS_FREESTRUCT) {
        dns_rdata_cname_t *cname = source;

        REQUIRE(source != NULL);

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

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

static inline isc_result_t
additionaldata_cname(ARGS_ADDLDATA) {
        UNUSED(rdata);
        UNUSED(add);
        UNUSED(arg);

        REQUIRE(rdata->type == 5);

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_cname(ARGS_DIGEST) {
        isc_region_t r;
        dns_name_t name;

        REQUIRE(rdata->type == 5);

        dns_rdata_toregion(rdata, &r);
        dns_name_init(&name, NULL);
        dns_name_fromregion(&name, &r);

        return (dns_name_digest(&name, digest, arg));
}

static inline isc_boolean_t
checkowner_cname(ARGS_CHECKOWNER) {

        REQUIRE(type == 5);

        UNUSED(name);
        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(wildcard);

        return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_cname(ARGS_CHECKNAMES) {

        REQUIRE(rdata->type == 5);

        UNUSED(rdata);
        UNUSED(owner);
        UNUSED(bad);

        return (ISC_TRUE);
}

static inline int
casecompare_cname(ARGS_COMPARE) {
        return (compare_cname(rdata1, rdata2));
}

#endif  /* RDATA_GENERIC_CNAME_5_C */

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