a6_38.c revision 7c7d67b5d88fba9d6fe7b4a93ef154e113153df2
/*
* 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: a6_38.c,v 1.30 2000/05/13 22:07:57 tale Exp $ */
/* draft-ietf-ipngwg-dns-lookups-03.txt */
#ifndef RDATA_IN_1_A6_28_C
#define RDATA_IN_1_A6_28_C
#include <isc/net.h>
#define RRTYPE_A6_ATTRIBUTES (0)
static inline isc_result_t
fromtext_in_a6(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;
unsigned char addr[16];
unsigned char prefixlen;
unsigned char octets;
unsigned char mask;
dns_name_t name;
isc_buffer_t buffer;
REQUIRE(type == 38);
REQUIRE(rdclass == 1);
/* prefix length */
RETERR(gettoken(lexer, &token, isc_tokentype_number, ISC_FALSE));
if (token.value.as_ulong > 128)
return (DNS_R_RANGE);
prefixlen = (unsigned char)token.value.as_ulong;
RETERR(mem_tobuffer(target, &prefixlen, 1));
/* suffix */
if (prefixlen != 128) {
/* prefix 0..127 */
octets = prefixlen/8;
/* octets 0..15 */
RETERR(gettoken(lexer, &token, isc_tokentype_string,
ISC_FALSE));
if (inet_pton(AF_INET6, token.value.as_pointer, addr) != 1)
return (DNS_R_BADAAAA);
mask = 0xff >> (prefixlen % 8);
addr[octets] &= mask;
RETERR(mem_tobuffer(target, &addr[octets], 16 - octets));
}
if (prefixlen == 0)
return (ISC_R_SUCCESS);
RETERR(gettoken(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;
return (dns_name_fromtext(&name, &buffer, origin, downcase, target));
}
static inline isc_result_t
totext_in_a6(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
isc_buffer_t *target)
{
isc_region_t tr;
isc_region_t sr;
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;
isc_boolean_t sub;
REQUIRE(rdata->type == 38);
REQUIRE(rdata->rdclass == 1);
dns_rdata_toregion(rdata, &sr);
prefixlen = sr.base[0];
INSIST(prefixlen <= 128);
isc_region_consume(&sr, 1);
sprintf(buf, "%u", prefixlen);
RETERR(str_totext(buf, target));
RETERR(str_totext(" ", target));
if (prefixlen != 128) {
octets = prefixlen/8;
memset(addr, 0, sizeof addr);
memcpy(&addr[octets], sr.base, 16 - octets);
mask = 0xff >> (prefixlen % 8);
addr[octets] &= mask;
isc_buffer_availableregion(target, &tr);
if (inet_ntop(AF_INET6, addr,
(char *)tr.base, tr.length) == NULL)
return (ISC_R_NOSPACE);
isc_buffer_add(target, strlen((char *)tr.base));
isc_region_consume(&sr, 16 - octets);
}
if (prefixlen == 0)
return (ISC_R_SUCCESS);
RETERR(str_totext(" ", 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(dns_rdataclass_t rdclass, dns_rdatatype_t type,
isc_buffer_t *source, dns_decompress_t *dctx,
isc_boolean_t downcase, isc_buffer_t *target)
{
isc_region_t sr;
unsigned char prefixlen;
unsigned char octets;
unsigned char mask;
dns_name_t name;
REQUIRE(type == 38);
REQUIRE(rdclass == 1);
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 (DNS_R_RANGE);
isc_region_consume(&sr, 1);
RETERR(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(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, downcase, target));
}
static inline isc_result_t
towire_in_a6(dns_rdata_t *rdata, dns_compress_t *cctx, isc_buffer_t *target) {
isc_region_t sr;
dns_name_t name;
unsigned char prefixlen;
unsigned char octets;
REQUIRE(rdata->type == 38);
REQUIRE(rdata->rdclass == 1);
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(mem_tobuffer(target, sr.base, octets));
isc_region_consume(&sr, octets);
if (prefixlen == 0)
return (ISC_R_SUCCESS);
dns_name_init(&name, NULL);
dns_name_fromregion(&name, &sr);
return (dns_name_towire(&name, cctx, target));
}
static inline int
compare_in_a6(dns_rdata_t *rdata1, dns_rdata_t *rdata2) {
int order;
unsigned char prefixlen1, prefixlen2;
unsigned char octets;
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 == 38);
REQUIRE(rdata1->rdclass == 1);
dns_rdata_toregion(rdata1, &region1);
dns_rdata_toregion(rdata2, &region2);
prefixlen1 = region1.base[0];
prefixlen2 = region2.base[0];
isc_region_consume(&region1, 1);
isc_region_consume(&region2, 1);
if (prefixlen1 < prefixlen2)
return (-1);
else if (prefixlen1 > prefixlen2)
return (1);
/*
* Prefix lengths are equal.
*/
octets = 16 - prefixlen1 / 8;
if (octets > 0) {
order = memcmp(region1.base, region2.base, octets);
if (order < 0)
return (-1);
else if (order > 0)
return (1);
/*
* Address suffixes are equal.
*/
if (prefixlen1 == 0)
return (order);
isc_region_consume(&region1, octets);
isc_region_consume(&region2, octets);
}
dns_name_init(&name1, NULL);
dns_name_init(&name2, NULL);
dns_name_fromregion(&name1, &region1);
dns_name_fromregion(&name2, &region2);
return (dns_name_rdatacompare(&name1, &name2));
}
static inline isc_result_t
fromstruct_in_a6(dns_rdataclass_t rdclass, dns_rdatatype_t type, void *source,
isc_buffer_t *target)
{
dns_rdata_in_a6_t *a6 = source;
unsigned char prefixlen;
unsigned char octets;
REQUIRE(type == 1);
REQUIRE(rdclass == 1);
REQUIRE(source != NULL);
REQUIRE(a6->common.rdtype == type);
REQUIRE(a6->common.rdclass == rdclass);
if (a6->prefixlen > 128)
return (DNS_R_RANGE);
prefixlen = a6->prefixlen;
RETERR(mem_tobuffer(target, &prefixlen, 1));
if (a6->prefixlen != 128) {
/* XXX fix this! */
}
octets = 16 - prefixlen / 8;
/*
* XXXDCL shut up IRIX compiler until this function is finished.
*/
UNUSED(octets);
return (ISC_R_NOTIMPLEMENTED);
}
static inline isc_result_t
tostruct_in_a6(dns_rdata_t *rdata, void *target, isc_mem_t *mctx)
{
dns_rdata_in_a6_t *a6 = target;
unsigned char octets;
dns_name_t name;
isc_region_t r;
REQUIRE(rdata->type == 38);
REQUIRE(rdata->rdclass == 1);
REQUIRE(target != NULL);
a6->common.rdclass = rdata->rdclass;
a6->common.rdtype = rdata->type;
ISC_LINK_INIT(&a6->common, link);
dns_rdata_toregion(rdata, &r);
a6->prefixlen = uint8_fromregion(&r);
isc_region_consume(&r, 1);
memset(a6->in6_addr.s6_addr, 0, sizeof(a6->in6_addr.s6_addr));
/* suffix */
if (a6->prefixlen != 128) {
octets = 16 - a6->prefixlen / 8;
INSIST(r.length >= octets);
memcpy(a6->in6_addr.s6_addr + 16 - octets, r.base, octets);
isc_region_consume(&r, octets);
}
/* prefix */
dns_name_init(&a6->prefix, NULL);
if (a6->prefixlen != 0) {
dns_name_init(&name, NULL);
dns_name_fromregion(&name, &r);
RETERR(name_duporclone(&name, mctx, &a6->prefix));
}
a6->mctx = mctx;
return (ISC_R_SUCCESS);
}
static inline void
freestruct_in_a6(void *source)
{
dns_rdata_in_a6_t *a6 = source;
REQUIRE(source != NULL);
REQUIRE(a6->common.rdclass == 1);
REQUIRE(a6->common.rdtype == 38);
if (a6->mctx == NULL)
return;
if (dns_name_dynamic(&a6->prefix))
dns_name_free(&a6->prefix, a6->mctx);
a6->mctx = NULL;
}
static inline isc_result_t
additionaldata_in_a6(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
void *arg)
{
REQUIRE(rdata->type == 38);
REQUIRE(rdata->rdclass == 1);
UNUSED(rdata);
UNUSED(add);
UNUSED(arg);
return (ISC_R_SUCCESS);
}
static inline isc_result_t
digest_in_a6(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg)
{
isc_region_t r1, r2;
unsigned char prefixlen, octets;
isc_result_t result;
dns_name_t name;
REQUIRE(rdata->type == 38);
REQUIRE(rdata->rdclass == 1);
dns_rdata_toregion(rdata, &r1);
r2 = r1;
prefixlen = r1.base[0];
octets = 1 + 16 - prefixlen / 8;
r1.length = octets;
result = (digest)(arg, &r1);
if (result != ISC_R_SUCCESS)
return (result);
if (prefixlen == 0)
return (ISC_R_SUCCESS);
isc_region_consume(&r2, octets);
dns_name_init(&name, NULL);
dns_name_fromregion(&name, &r2);
return (dns_name_digest(&name, digest, arg));
}
#endif /* RDATA_IN_1_A6_38_C */