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