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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* 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: a6_38.c,v 1.14 2020/09/14 08:40:44 florian Exp $ */
/* RFC2874 */
#ifndef RDATA_IN_1_A6_28_C
#define RDATA_IN_1_A6_28_C
static inline isc_result_t
totext_in_a6(ARGS_TOTEXT) {
isc_region_t sr, ar;
unsigned char addr[16];
unsigned char prefixlen;
unsigned char octets;
unsigned char mask;
char buf[sizeof("128")];
dns_name_t name;
dns_name_t prefix;
int sub;
REQUIRE(rdata->type == dns_rdatatype_a6);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
REQUIRE(rdata->length != 0);
dns_rdata_toregion(rdata, &sr);
prefixlen = sr.base[0];
INSIST(prefixlen <= 128);
isc_region_consume(&sr, 1);
snprintf(buf, sizeof(buf), "%u", prefixlen);
RETERR(isc_str_tobuffer(buf, target));
RETERR(isc_str_tobuffer(" ", target));
if (prefixlen != 128) {
octets = prefixlen/8;
memset(addr, 0, sizeof(addr));
memmove(&addr[octets], sr.base, 16 - octets);
mask = 0xff >> (prefixlen % 8);
addr[octets] &= mask;
ar.base = addr;
ar.length = sizeof(addr);
RETERR(inet_totext(AF_INET6, &ar, target));
isc_region_consume(&sr, 16 - octets);
}
if (prefixlen == 0)
return (ISC_R_SUCCESS);
RETERR(isc_str_tobuffer(" ", target));
dns_name_init(&name, NULL);
dns_name_init(&prefix, NULL);
dns_name_fromregion(&name, &sr);
sub = name_prefix(&name, tctx->origin, &prefix);
return (dns_name_totext(&prefix, sub, target));
}
static inline isc_result_t
fromwire_in_a6(ARGS_FROMWIRE) {
isc_region_t sr;
unsigned char prefixlen;
unsigned char octets;
unsigned char mask;
dns_name_t name;
REQUIRE(type == dns_rdatatype_a6);
REQUIRE(rdclass == dns_rdataclass_in);
UNUSED(type);
UNUSED(rdclass);
dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
isc_buffer_activeregion(source, &sr);
/*
* Prefix length.
*/
if (sr.length < 1)
return (ISC_R_UNEXPECTEDEND);
prefixlen = sr.base[0];
if (prefixlen > 128)
return (ISC_R_RANGE);
isc_region_consume(&sr, 1);
RETERR(isc_mem_tobuffer(target, &prefixlen, 1));
isc_buffer_forward(source, 1);
/*
* Suffix.
*/
if (prefixlen != 128) {
octets = 16 - prefixlen / 8;
if (sr.length < octets)
return (ISC_R_UNEXPECTEDEND);
mask = 0xff >> (prefixlen % 8);
sr.base[0] &= mask; /* Ensure pad bits are zero. */
RETERR(isc_mem_tobuffer(target, sr.base, octets));
isc_buffer_forward(source, octets);
}
if (prefixlen == 0)
return (ISC_R_SUCCESS);
dns_name_init(&name, NULL);
return (dns_name_fromwire(&name, source, dctx, options, target));
}
static inline isc_result_t
towire_in_a6(ARGS_TOWIRE) {
isc_region_t sr;
dns_name_t name;
dns_offsets_t offsets;
unsigned char prefixlen;
unsigned char octets;
REQUIRE(rdata->type == dns_rdatatype_a6);
REQUIRE(rdata->rdclass == dns_rdataclass_in);
REQUIRE(rdata->length != 0);
dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
dns_rdata_toregion(rdata, &sr);
prefixlen = sr.base[0];
INSIST(prefixlen <= 128);
octets = 1 + 16 - prefixlen / 8;
RETERR(isc_mem_tobuffer(target, sr.base, octets));
isc_region_consume(&sr, octets);
if (prefixlen == 0)
return (ISC_R_SUCCESS);
dns_name_init(&name, offsets);
dns_name_fromregion(&name, &sr);
return (dns_name_towire(&name, cctx, target));
}
#endif /* RDATA_IN_1_A6_38_C */
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