1/* $NetBSD: soa.c,v 1.2.6.1 2012/06/05 21:15:01 bouyer Exp $ */ 2 3/* 4 * Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 2000, 2001 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20/* Id: soa.c,v 1.12 2009/09/10 02:18:40 each Exp */ 21 22/*! \file */ 23 24#include <config.h> 25#include <string.h> 26 27#include <isc/buffer.h> 28#include <isc/util.h> 29 30#include <dns/rdata.h> 31#include <dns/rdatastruct.h> 32#include <dns/soa.h> 33 34static inline isc_uint32_t 35decode_uint32(unsigned char *p) { 36 return ((p[0] << 24) + 37 (p[1] << 16) + 38 (p[2] << 8) + 39 (p[3] << 0)); 40} 41 42static inline void 43encode_uint32(isc_uint32_t val, unsigned char *p) { 44 p[0] = (isc_uint8_t)(val >> 24); 45 p[1] = (isc_uint8_t)(val >> 16); 46 p[2] = (isc_uint8_t)(val >> 8); 47 p[3] = (isc_uint8_t)(val >> 0); 48} 49 50static isc_uint32_t 51soa_get(dns_rdata_t *rdata, int offset) { 52 INSIST(rdata->type == dns_rdatatype_soa); 53 /* 54 * Locate the field within the SOA RDATA based 55 * on its position relative to the end of the data. 56 * 57 * This is a bit of a kludge, but the alternative approach of 58 * using dns_rdata_tostruct() and dns_rdata_fromstruct() would 59 * involve a lot of unnecessary work (like building domain 60 * names and allocating temporary memory) when all we really 61 * want to do is to get 32 bits of fixed-sized data. 62 */ 63 INSIST(rdata->length >= 20); 64 INSIST(offset >= 0 && offset <= 16); 65 return (decode_uint32(rdata->data + rdata->length - 20 + offset)); 66} 67 68isc_result_t 69dns_soa_buildrdata(dns_name_t *origin, dns_name_t *contact, 70 dns_rdataclass_t rdclass, 71 isc_uint32_t serial, isc_uint32_t refresh, 72 isc_uint32_t retry, isc_uint32_t expire, 73 isc_uint32_t minimum, unsigned char *buffer, 74 dns_rdata_t *rdata) { 75 dns_rdata_soa_t soa; 76 isc_buffer_t rdatabuf; 77 78 REQUIRE(origin != NULL); 79 REQUIRE(contact != NULL); 80 81 memset(buffer, 0, DNS_SOA_BUFFERSIZE); 82 isc_buffer_init(&rdatabuf, buffer, DNS_SOA_BUFFERSIZE); 83 84 soa.common.rdtype = dns_rdatatype_soa; 85 soa.common.rdclass = rdclass; 86 soa.mctx = NULL; 87 soa.serial = serial; 88 soa.refresh = refresh; 89 soa.retry = retry; 90 soa.expire = expire; 91 soa.minimum = minimum; 92 dns_name_init(&soa.origin, NULL); 93 dns_name_clone(origin, &soa.origin); 94 dns_name_init(&soa.contact, NULL); 95 dns_name_clone(contact, &soa.contact); 96 97 return (dns_rdata_fromstruct(rdata, rdclass, dns_rdatatype_soa, 98 &soa, &rdatabuf)); 99} 100 101isc_uint32_t 102dns_soa_getserial(dns_rdata_t *rdata) { 103 return soa_get(rdata, 0); 104} 105isc_uint32_t 106dns_soa_getrefresh(dns_rdata_t *rdata) { 107 return soa_get(rdata, 4); 108} 109isc_uint32_t 110dns_soa_getretry(dns_rdata_t *rdata) { 111 return soa_get(rdata, 8); 112} 113isc_uint32_t 114dns_soa_getexpire(dns_rdata_t *rdata) { 115 return soa_get(rdata, 12); 116} 117isc_uint32_t 118dns_soa_getminimum(dns_rdata_t *rdata) { 119 return soa_get(rdata, 16); 120} 121 122static void 123soa_set(dns_rdata_t *rdata, isc_uint32_t val, int offset) { 124 INSIST(rdata->type == dns_rdatatype_soa); 125 INSIST(rdata->length >= 20); 126 INSIST(offset >= 0 && offset <= 16); 127 encode_uint32(val, rdata->data + rdata->length - 20 + offset); 128} 129 130void 131dns_soa_setserial(isc_uint32_t val, dns_rdata_t *rdata) { 132 soa_set(rdata, val, 0); 133} 134void 135dns_soa_setrefresh(isc_uint32_t val, dns_rdata_t *rdata) { 136 soa_set(rdata, val, 4); 137} 138void 139dns_soa_setretry(isc_uint32_t val, dns_rdata_t *rdata) { 140 soa_set(rdata, val, 8); 141} 142void 143dns_soa_setexpire(isc_uint32_t val, dns_rdata_t *rdata) { 144 soa_set(rdata, val, 12); 145} 146void 147dns_soa_setminimum(isc_uint32_t val, dns_rdata_t *rdata) { 148 soa_set(rdata, val, 16); 149} 150