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bind/lib/dns/rdata/in_1/px_26.c
Evan Hunt afb424c9b6 simplify dns_name_fromtext() interface 
previously, dns_name_fromtext() took both a target name and an
optional target buffer parameter, which could override the name's
dedicated buffer. this interface is unnecessarily complex.

we now have two functions, dns_name_fromtext() to convert text
into a dns_name that has a dedicated buffer, and dns_name_wirefromtext()
to convert text into uncompressed DNS wire format and append it to a
target buffer.

in cases where it really is necessary to have both, we can use
dns_name_fromtext() to load the dns_name, then dns_name_towire()
to append the wire format to the target buffer.
2025-02-25 12:53:25 -08:00

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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* 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 https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/* RFC2163 */
#ifndef RDATA_IN_1_PX_26_C
#define RDATA_IN_1_PX_26_C
#define RRTYPE_PX_ATTRIBUTES (0)
static isc_result_t
fromtext_in_px(ARGS_FROMTEXT) {
isc_token_t token;
isc_buffer_t buffer;
REQUIRE(type == dns_rdatatype_px);
REQUIRE(rdclass == dns_rdataclass_in);
UNUSED(type);
UNUSED(rdclass);
UNUSED(callbacks);
if (origin == NULL) {
origin = dns_rootname;
}
/*
* Preference.
*/
RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
false));
if (token.value.as_ulong > 0xffffU) {
RETTOK(ISC_R_RANGE);
}
RETERR(uint16_tobuffer(token.value.as_ulong, target));
/*
* MAP822.
*/
RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
false));
buffer_fromregion(&buffer, &token.value.as_region);
RETTOK(dns_name_wirefromtext(&buffer, origin, options, target));
/*
* MAPX400.
*/
RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
false));
buffer_fromregion(&buffer, &token.value.as_region);
RETTOK(dns_name_wirefromtext(&buffer, origin, options, target));
return ISC_R_SUCCESS;
}
static isc_result_t
totext_in_px(ARGS_TOTEXT) {
isc_region_t region;
dns_name_t name;
dns_name_t prefix;
unsigned int opts;
char buf[sizeof("64000")];
unsigned short num;
REQUIRE(rdata->type == dns_rdatatype_px);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
REQUIRE(rdata->length != 0);
dns_name_init(&name);
dns_name_init(&prefix);
/*
* Preference.
*/
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));
/*
* MAP822.
*/
dns_name_fromregion(&name, &region);
opts = name_prefix(&name, tctx->origin, &prefix) ? DNS_NAME_OMITFINALDOT
: 0;
isc_region_consume(&region, name_length(&name));
RETERR(dns_name_totext(&prefix, opts, target));
RETERR(str_totext(" ", target));
/*
* MAPX400.
*/
dns_name_fromregion(&name, &region);
opts = name_prefix(&name, tctx->origin, &prefix) ? DNS_NAME_OMITFINALDOT
: 0;
return dns_name_totext(&prefix, opts, target);
}
static isc_result_t
fromwire_in_px(ARGS_FROMWIRE) {
dns_name_t name;
isc_region_t sregion;
REQUIRE(type == dns_rdatatype_px);
REQUIRE(rdclass == dns_rdataclass_in);
UNUSED(type);
UNUSED(rdclass);
dctx = dns_decompress_setpermitted(dctx, false);
dns_name_init(&name);
/*
* Preference.
*/
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);
/*
* MAP822.
*/
RETERR(dns_name_fromwire(&name, source, dctx, target));
/*
* MAPX400.
*/
return dns_name_fromwire(&name, source, dctx, target);
}
static isc_result_t
towire_in_px(ARGS_TOWIRE) {
dns_name_t name;
isc_region_t region;
REQUIRE(rdata->type == dns_rdatatype_px);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
REQUIRE(rdata->length != 0);
dns_compress_setpermitted(cctx, false);
/*
* Preference.
*/
dns_rdata_toregion(rdata, &region);
RETERR(mem_tobuffer(target, region.base, 2));
isc_region_consume(&region, 2);
/*
* MAP822.
*/
dns_name_init(&name);
dns_name_fromregion(&name, &region);
RETERR(dns_name_towire(&name, cctx, target));
isc_region_consume(&region, name_length(&name));
/*
* MAPX400.
*/
dns_name_init(&name);
dns_name_fromregion(&name, &region);
return dns_name_towire(&name, cctx, target);
}
static int
compare_in_px(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_px);
REQUIRE(rdata1->rdclass == dns_rdataclass_in);
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);
dns_name_init(&name2);
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);
order = dns_name_rdatacompare(&name1, &name2);
if (order != 0) {
return order;
}
isc_region_consume(&region1, name_length(&name1));
isc_region_consume(&region2, name_length(&name2));
dns_name_fromregion(&name1, &region1);
dns_name_fromregion(&name2, &region2);
return dns_name_rdatacompare(&name1, &name2);
}
static isc_result_t
fromstruct_in_px(ARGS_FROMSTRUCT) {
dns_rdata_in_px_t *px = source;
isc_region_t region;
REQUIRE(type == dns_rdatatype_px);
REQUIRE(rdclass == dns_rdataclass_in);
REQUIRE(px != NULL);
REQUIRE(px->common.rdtype == type);
REQUIRE(px->common.rdclass == rdclass);
UNUSED(type);
UNUSED(rdclass);
RETERR(uint16_tobuffer(px->preference, target));
dns_name_toregion(&px->map822, &region);
RETERR(isc_buffer_copyregion(target, &region));
dns_name_toregion(&px->mapx400, &region);
return isc_buffer_copyregion(target, &region);
}
static isc_result_t
tostruct_in_px(ARGS_TOSTRUCT) {
dns_rdata_in_px_t *px = target;
dns_name_t name;
isc_region_t region;
REQUIRE(rdata->type == dns_rdatatype_px);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
REQUIRE(px != NULL);
REQUIRE(rdata->length != 0);
px->common.rdclass = rdata->rdclass;
px->common.rdtype = rdata->type;
ISC_LINK_INIT(&px->common, link);
dns_name_init(&name);
dns_rdata_toregion(rdata, &region);
px->preference = uint16_fromregion(&region);
isc_region_consume(&region, 2);
dns_name_fromregion(&name, &region);
dns_name_init(&px->map822);
name_duporclone(&name, mctx, &px->map822);
isc_region_consume(&region, name_length(&px->map822));
dns_name_init(&px->mapx400);
name_duporclone(&name, mctx, &px->mapx400);
px->mctx = mctx;
return ISC_R_SUCCESS;
}
static void
freestruct_in_px(ARGS_FREESTRUCT) {
dns_rdata_in_px_t *px = source;
REQUIRE(px != NULL);
REQUIRE(px->common.rdclass == dns_rdataclass_in);
REQUIRE(px->common.rdtype == dns_rdatatype_px);
if (px->mctx == NULL) {
return;
}
dns_name_free(&px->map822, px->mctx);
dns_name_free(&px->mapx400, px->mctx);
px->mctx = NULL;
}
static isc_result_t
additionaldata_in_px(ARGS_ADDLDATA) {
REQUIRE(rdata->type == dns_rdatatype_px);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
UNUSED(rdata);
UNUSED(owner);
UNUSED(add);
UNUSED(arg);
return ISC_R_SUCCESS;
}
static isc_result_t
digest_in_px(ARGS_DIGEST) {
isc_region_t r1, r2;
dns_name_t name;
isc_result_t result;
REQUIRE(rdata->type == dns_rdatatype_px);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
dns_rdata_toregion(rdata, &r1);
r2 = r1;
isc_region_consume(&r2, 2);
r1.length = 2;
result = (digest)(arg, &r1);
if (result != ISC_R_SUCCESS) {
return result;
}
dns_name_init(&name);
dns_name_fromregion(&name, &r2);
result = dns_name_digest(&name, digest, arg);
if (result != ISC_R_SUCCESS) {
return result;
}
isc_region_consume(&r2, name_length(&name));
dns_name_init(&name);
dns_name_fromregion(&name, &r2);
return dns_name_digest(&name, digest, arg);
}
static bool
checkowner_in_px(ARGS_CHECKOWNER) {
REQUIRE(type == dns_rdatatype_px);
REQUIRE(rdclass == dns_rdataclass_in);
UNUSED(name);
UNUSED(type);
UNUSED(rdclass);
UNUSED(wildcard);
return true;
}
static bool
checknames_in_px(ARGS_CHECKNAMES) {
REQUIRE(rdata->type == dns_rdatatype_px);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
UNUSED(rdata);
UNUSED(owner);
UNUSED(bad);
return true;
}
static int
casecompare_in_px(ARGS_COMPARE) {
return compare_in_px(rdata1, rdata2);
}
#endif /* RDATA_IN_1_PX_26_C */
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