dname_39.c

/*
 * Copyright (C) 1999, 2000  Internet Software Consortium.
 * 
 * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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: dname_39.c,v 1.17 2000/04/07 03:54:10 explorer Exp $ */

/* Reviewed: Wed Mar 15 16:52:38 PST 2000 by explorer */

/* draft-ietf-dnsind-dname-02.txt */

#ifndef RDATA_GENERIC_DNAME_39_C
#define RDATA_GENERIC_DNAME_39_C

#define RRTYPE_DNAME_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON)

static inline isc_result_t
fromtext_dname(dns_rdataclass_t rdclass, dns_rdatatype_t type,
	       isc_lex_t *lexer, dns_name_t *origin,
	       isc_boolean_t downcase, isc_buffer_t *target)
{
	isc_token_t token;
	dns_name_t name;
	isc_buffer_t buffer;

	UNUSED(rdclass);

	REQUIRE(type == 39);
	
	RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));
	
	dns_name_init(&name, NULL);
	buffer_fromregion(&buffer, &token.value.as_region,
			  ISC_BUFFERTYPE_TEXT);
	origin = (origin != NULL) ? origin : dns_rootname;
	return (dns_name_fromtext(&name, &buffer, origin, downcase, target));
}

static inline isc_result_t
totext_dname(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx, 
	     isc_buffer_t *target) 
{
	isc_region_t region;
	dns_name_t name;
	dns_name_t prefix;
	isc_boolean_t sub;

	REQUIRE(rdata->type == 39);

	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_dname(dns_rdataclass_t rdclass, dns_rdatatype_t type,
	       isc_buffer_t *source, dns_decompress_t *dctx,
	       isc_boolean_t downcase, isc_buffer_t *target)
{
	dns_name_t name;

	UNUSED(rdclass);

	REQUIRE(type == 39);

	if (dns_decompress_edns(dctx) >= 1 || !dns_decompress_strict(dctx))
		dns_decompress_setmethods(dctx, DNS_COMPRESS_ALL);
	else
		dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

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

static inline isc_result_t
towire_dname(dns_rdata_t *rdata, dns_compress_t *cctx, isc_buffer_t *target)
{
	dns_name_t name;
	isc_region_t region;

	REQUIRE(rdata->type == 39);

	if (dns_compress_getedns(cctx) >= 1)
		dns_compress_setmethods(cctx, DNS_COMPRESS_ALL);
	else
		dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);

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

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

static inline int
compare_dname(dns_rdata_t *rdata1, dns_rdata_t *rdata2)
{
	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 == 39);

	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_dname(dns_rdataclass_t rdclass, dns_rdatatype_t type, void *source,
		 isc_buffer_t *target)
{
	UNUSED(rdclass);
	UNUSED(source);
	UNUSED(target);

	REQUIRE(type == 39);

	return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_result_t
tostruct_dname(dns_rdata_t *rdata, void *target, isc_mem_t *mctx)
{
	UNUSED(target);
	UNUSED(mctx);

	REQUIRE(rdata->type == 39);
	REQUIRE(target != NULL);

	return (ISC_R_NOTIMPLEMENTED);
}

static inline void
freestruct_dname(void *source)
{
	REQUIRE(source != NULL);
	REQUIRE(ISC_FALSE);	/* XXX */
}

static inline isc_result_t
additionaldata_dname(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
		     void *arg)
{
	UNUSED(add);
	UNUSED(arg);

	REQUIRE(rdata->type == 39);

	return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_dname(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg)
{
	isc_region_t r;
	dns_name_t name;

	REQUIRE(rdata->type == 39);

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

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

#endif	/* RDATA_GENERIC_DNAME_39_C */