110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
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* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: soa.c,v 1.3.206.1 2004/03/06 08:13:45 marka Exp $ */
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#include <config.h>
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#include <isc/util.h>
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#include <dns/rdata.h>
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#include <dns/soa.h>
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static inline isc_uint32_t
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decode_uint32(unsigned char *p) {
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return ((p[0] << 24) +
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(p[1] << 16) +
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(p[2] << 8) +
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(p[3] << 0));
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}
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static inline void
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encode_uint32(isc_uint32_t val, unsigned char *p) {
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p[0] = (isc_uint8_t)(val >> 24);
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p[1] = (isc_uint8_t)(val >> 16);
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p[2] = (isc_uint8_t)(val >> 8);
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p[3] = (isc_uint8_t)(val >> 0);
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}
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static isc_uint32_t
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soa_get(dns_rdata_t *rdata, int offset) {
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INSIST(rdata->type == dns_rdatatype_soa);
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/*
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* Locate the field within the SOA RDATA based
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* on its position relative to the end of the data.
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*
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* This is a bit of a kludge, but the alternative approach of
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* using dns_rdata_tostruct() and dns_rdata_fromstruct() would
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* involve a lot of unnecessary work (like building domain
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* names and allocating temporary memory) when all we really
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* want to do is to get 32 bits of fixed-sized data.
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*/
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INSIST(rdata->length >= 20);
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INSIST(offset >= 0 && offset <= 16);
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return (decode_uint32(rdata->data + rdata->length - 20 + offset));
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}
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isc_uint32_t
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dns_soa_getserial(dns_rdata_t *rdata) {
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return soa_get(rdata, 0);
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}
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isc_uint32_t
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dns_soa_getrefresh(dns_rdata_t *rdata) {
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return soa_get(rdata, 4);
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}
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isc_uint32_t
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dns_soa_getretry(dns_rdata_t *rdata) {
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return soa_get(rdata, 8);
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}
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isc_uint32_t
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dns_soa_getexpire(dns_rdata_t *rdata) {
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return soa_get(rdata, 12);
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}
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isc_uint32_t
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dns_soa_getminimum(dns_rdata_t *rdata) {
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return soa_get(rdata, 16);
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}
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static void
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soa_set(dns_rdata_t *rdata, isc_uint32_t val, int offset) {
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INSIST(rdata->type == dns_rdatatype_soa);
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INSIST(rdata->length >= 20);
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INSIST(offset >= 0 && offset <= 16);
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encode_uint32(val, rdata->data + rdata->length - 20 + offset);
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}
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void
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dns_soa_setserial(isc_uint32_t val, dns_rdata_t *rdata) {
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soa_set(rdata, val, 0);
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}
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void
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dns_soa_setrefresh(isc_uint32_t val, dns_rdata_t *rdata) {
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soa_set(rdata, val, 4);
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}
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void
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dns_soa_setretry(isc_uint32_t val, dns_rdata_t *rdata) {
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soa_set(rdata, val, 8);
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}
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void
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dns_soa_setexpire(isc_uint32_t val, dns_rdata_t *rdata) {
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soa_set(rdata, val, 12);
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}
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void
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dns_soa_setminimum(isc_uint32_t val, dns_rdata_t *rdata) {
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soa_set(rdata, val, 16);
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}
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