/*

 * Copyright (C) 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/.

 *

 * See the COPYRIGHT file distributed with this work for additional

 * information regarding copyright ownership.

 */

/* RFC2535 */

#ifndef RDATA_GENERIC_NXT_30_C

#define RDATA_GENERIC_NXT_30_C

/*

 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON

 * because we must be able to handle a parent/child NXT pair.

 */

#define RRTYPE_NXT_ATTRIBUTES (0)

static inline isc_result_t

fromtext_nxt(ARGS_FROMTEXT) {

	isc_token_t token;

	dns_name_t name;

	isc_buffer_t buffer;

	char *e;

	unsigned char bm[8*1024]; /* 64k bits */

	dns_rdatatype_t covered;

	dns_rdatatype_t maxcovered = 0;

	bool first = true;

	long n;

	REQUIRE(type == dns_rdatatype_nxt);

	UNUSED(type);

	UNUSED(rdclass);

	UNUSED(callbacks);

	/*

	 * Next domain.

	 */

	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,

				      false));

	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));

	memset(bm, 0, sizeof(bm));

	do {

		RETERR(isc_lex_getmastertoken(lexer, &token,

					      isc_tokentype_string, true));

		if (token.type != isc_tokentype_string)

			break;

		n = strtol(DNS_AS_STR(token), &e, 10);

		if (e != DNS_AS_STR(token) && *e == '\0') {

			covered = (dns_rdatatype_t)n;

		} else if (dns_rdatatype_fromtext(&covered,

				&token.value.as_textregion) == DNS_R_UNKNOWN)

			RETTOK(DNS_R_UNKNOWN);

		/*

		 * NXT is only specified for types 1..127.

		 */

		if (covered < 1 || covered > 127)

			return (ISC_R_RANGE);

		if (first || covered > maxcovered)

			maxcovered = covered;

		first = false;

		bm[covered/8] |= (0x80>>(covered%8));

	} while (1);

	isc_lex_ungettoken(lexer, &token);

	if (first)

		return (ISC_R_SUCCESS);

	n = (maxcovered + 8) / 8;

	return (mem_tobuffer(target, bm, n));

}

static inline isc_result_t

totext_nxt(ARGS_TOTEXT) {

	isc_region_t sr;

	unsigned int i, j;

	dns_name_t name;

	dns_name_t prefix;

	bool sub;

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	REQUIRE(rdata->length != 0);

	dns_name_init(&name, NULL);

	dns_name_init(&prefix, NULL);

	dns_rdata_toregion(rdata, &sr);

	dns_name_fromregion(&name, &sr);

	isc_region_consume(&sr, name_length(&name));

	sub = name_prefix(&name, tctx->origin, &prefix);

	RETERR(dns_name_totext(&prefix, sub, target));

	for (i = 0; i < sr.length; i++) {

		if (sr.base[i] != 0)

			for (j = 0; j < 8; j++)

				if ((sr.base[i] & (0x80 >> j)) != 0) {

					dns_rdatatype_t t = i * 8 + j;

					RETERR(str_totext(" ", target));

					if (dns_rdatatype_isknown(t)) {

						RETERR(dns_rdatatype_totext(t,

								      target));

					} else {

						char buf[sizeof("65535")];

						snprintf(buf, sizeof(buf),

							 "%u", t);

						RETERR(str_totext(buf,

								  target));

					}

				}

	}

	return (ISC_R_SUCCESS);

}

static inline isc_result_t

fromwire_nxt(ARGS_FROMWIRE) {

	isc_region_t sr;

	dns_name_t name;

	REQUIRE(type == dns_rdatatype_nxt);

	UNUSED(type);

	UNUSED(rdclass);

	dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

	dns_name_init(&name, NULL);

	RETERR(dns_name_fromwire(&name, source, dctx, options, target));

	isc_buffer_activeregion(source, &sr);

	if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&

	    ((sr.length > 16) || sr.base[sr.length - 1] == 0))

		return (DNS_R_BADBITMAP);

	RETERR(mem_tobuffer(target, sr.base, sr.length));

	isc_buffer_forward(source, sr.length);

	return (ISC_R_SUCCESS);

}

static inline isc_result_t

towire_nxt(ARGS_TOWIRE) {

	isc_region_t sr;

	dns_name_t name;

	dns_offsets_t offsets;

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	REQUIRE(rdata->length != 0);

	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);

	dns_name_init(&name, offsets);

	dns_rdata_toregion(rdata, &sr);

	dns_name_fromregion(&name, &sr);

	isc_region_consume(&sr, name_length(&name));

	RETERR(dns_name_towire(&name, cctx, target));

	return (mem_tobuffer(target, sr.base, sr.length));

}

static inline int

compare_nxt(ARGS_COMPARE) {

	isc_region_t r1;

	isc_region_t r2;

	dns_name_t name1;

	dns_name_t name2;

	int order;

	REQUIRE(rdata1->type == rdata2->type);

	REQUIRE(rdata1->rdclass == rdata2->rdclass);

	REQUIRE(rdata1->type == dns_rdatatype_nxt);

	REQUIRE(rdata1->length != 0);

	REQUIRE(rdata2->length != 0);

	dns_name_init(&name1, NULL);

	dns_name_init(&name2, NULL);

	dns_rdata_toregion(rdata1, &r1;;

	dns_rdata_toregion(rdata2, &r2;;

	dns_name_fromregion(&name1, &r1;;

	dns_name_fromregion(&name2, &r2;;

	order = dns_name_rdatacompare(&name1, &name2);

	if (order != 0)

		return (order);

	isc_region_consume(&r1, name_length(&name1));

	isc_region_consume(&r2, name_length(&name2));

	return (isc_region_compare(&r1, &r2));

}

static inline isc_result_t

fromstruct_nxt(ARGS_FROMSTRUCT) {

	dns_rdata_nxt_t *nxt;

	isc_region_t region;

	REQUIRE(type == dns_rdatatype_nxt);

	REQUIRE(((dns_rdata_nxt_t *)source) != NULL);

	nxt = source;

	REQUIRE(nxt->common.rdtype == type);

	REQUIRE(nxt->common.rdclass == rdclass);

	REQUIRE(nxt->typebits != NULL || nxt->len == 0);

	if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) {

		REQUIRE(nxt->len <= 16);

		REQUIRE(nxt->typebits[nxt->len - 1] != 0);

	}

	UNUSED(type);

	UNUSED(rdclass);

	dns_name_toregion(&nxt->next, &region);

	RETERR(isc_buffer_copyregion(target, &region));

	return (mem_tobuffer(target, nxt->typebits, nxt->len));

}

static inline isc_result_t

tostruct_nxt(ARGS_TOSTRUCT) {

	isc_region_t region;

	dns_rdata_nxt_t *nxt;

	dns_name_t name;

	REQUIRE(((dns_rdata_nxt_t *)target) != NULL);

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	REQUIRE(rdata->length != 0);

	nxt = target;

	nxt->common.rdclass = rdata->rdclass;

	nxt->common.rdtype = rdata->type;

	ISC_LINK_INIT(&nxt->common, link);

	dns_name_init(&name, NULL);

	dns_rdata_toregion(rdata, &region);

	dns_name_fromregion(&name, &region);

	isc_region_consume(&region, name_length(&name));

	dns_name_init(&nxt->next, NULL);

	RETERR(name_duporclone(&name, mctx, &nxt->next));

	nxt->len = region.length;

	nxt->typebits = mem_maybedup(mctx, region.base, region.length);

	if (nxt->typebits == NULL)

		goto cleanup;

	nxt->mctx = mctx;

	return (ISC_R_SUCCESS);

 cleanup:

	if (mctx != NULL)

		dns_name_free(&nxt->next, mctx);

	return (ISC_R_NOMEMORY);

}

static inline void

freestruct_nxt(ARGS_FREESTRUCT) {

	dns_rdata_nxt_t *nxt;

	REQUIRE(((dns_rdata_nxt_t *)source) != NULL);

	REQUIRE(((dns_rdata_nxt_t *)source)->common.rdtype ==

		dns_rdatatype_nxt);

	nxt = source;

	if (nxt->mctx == NULL)

		return;

	dns_name_free(&nxt->next, nxt->mctx);

	if (nxt->typebits != NULL)

		isc_mem_free(nxt->mctx, nxt->typebits);

	nxt->mctx = NULL;

}

static inline isc_result_t

additionaldata_nxt(ARGS_ADDLDATA) {

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	UNUSED(rdata);

	UNUSED(add);

	UNUSED(arg);

	return (ISC_R_SUCCESS);

}

static inline isc_result_t

digest_nxt(ARGS_DIGEST) {

	isc_region_t r;

	dns_name_t name;

	isc_result_t result;

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	dns_rdata_toregion(rdata, &r);

	dns_name_init(&name, NULL);

	dns_name_fromregion(&name, &r);

	result = dns_name_digest(&name, digest, arg);

	if (result != ISC_R_SUCCESS)

		return (result);

	isc_region_consume(&r, name_length(&name));

	return ((digest)(arg, &r);;

}

static inline bool

checkowner_nxt(ARGS_CHECKOWNER) {

	REQUIRE(type == dns_rdatatype_nxt);

	UNUSED(name);

	UNUSED(type);

	UNUSED(rdclass);

	UNUSED(wildcard);

	return (true);

}

static inline bool

checknames_nxt(ARGS_CHECKNAMES) {

	REQUIRE(rdata->type == dns_rdatatype_nxt);

	UNUSED(rdata);

	UNUSED(owner);

	UNUSED(bad);

	return (true);

}

static inline int

casecompare_nxt(ARGS_COMPARE) {

	return (compare_nxt(rdata1, rdata2));

}

#endif	/* RDATA_GENERIC_NXT_30_C */