1/* 2 * Copyright (C) 2004, 2005, 2007, 2011-2014 Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (C) 1999-2001 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/* $Id$ */ 19 20/*! \file */ 21 22#include <config.h> 23 24#include <ctype.h> 25#include <errno.h> 26#include <stdio.h> 27#include <stdlib.h> 28 29#include <isc/buffer.h> 30#include <isc/parseint.h> 31#include <isc/print.h> 32#include <isc/region.h> 33#include <isc/string.h> 34#include <isc/util.h> 35 36#include <dns/result.h> 37#include <dns/ttl.h> 38 39#define RETERR(x) do { \ 40 isc_result_t _r = (x); \ 41 if (_r != ISC_R_SUCCESS) \ 42 return (_r); \ 43 } while (0) 44 45 46static isc_result_t bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl); 47 48/* 49 * Helper for dns_ttl_totext(). 50 */ 51static isc_result_t 52ttlfmt(unsigned int t, const char *s, isc_boolean_t verbose, 53 isc_boolean_t space, isc_buffer_t *target) 54{ 55 char tmp[60]; 56 unsigned int len; 57 isc_region_t region; 58 59 if (verbose) 60 len = snprintf(tmp, sizeof(tmp), "%s%u %s%s", 61 space ? " " : "", 62 t, s, 63 t == 1 ? "" : "s"); 64 else 65 len = snprintf(tmp, sizeof(tmp), "%u%c", t, s[0]); 66 67 INSIST(len + 1 <= sizeof(tmp)); 68 isc_buffer_availableregion(target, ®ion); 69 if (len > region.length) 70 return (ISC_R_NOSPACE); 71 memmove(region.base, tmp, len); 72 isc_buffer_add(target, len); 73 74 return (ISC_R_SUCCESS); 75} 76 77/* 78 * Derived from bind8 ns_format_ttl(). 79 */ 80isc_result_t 81dns_ttl_totext(isc_uint32_t src, isc_boolean_t verbose, isc_buffer_t *target) { 82 unsigned secs, mins, hours, days, weeks, x; 83 84 secs = src % 60; src /= 60; 85 mins = src % 60; src /= 60; 86 hours = src % 24; src /= 24; 87 days = src % 7; src /= 7; 88 weeks = src; src = 0; 89 POST(src); 90 91 x = 0; 92 if (weeks != 0) { 93 RETERR(ttlfmt(weeks, "week", verbose, ISC_TF(x > 0), target)); 94 x++; 95 } 96 if (days != 0) { 97 RETERR(ttlfmt(days, "day", verbose, ISC_TF(x > 0), target)); 98 x++; 99 } 100 if (hours != 0) { 101 RETERR(ttlfmt(hours, "hour", verbose, ISC_TF(x > 0), target)); 102 x++; 103 } 104 if (mins != 0) { 105 RETERR(ttlfmt(mins, "minute", verbose, ISC_TF(x > 0), target)); 106 x++; 107 } 108 if (secs != 0 || 109 (weeks == 0 && days == 0 && hours == 0 && mins == 0)) { 110 RETERR(ttlfmt(secs, "second", verbose, ISC_TF(x > 0), target)); 111 x++; 112 } 113 INSIST (x > 0); 114 /* 115 * If only a single unit letter is printed, print it 116 * in upper case. (Why? Because BIND 8 does that. 117 * Presumably it has a reason.) 118 */ 119 if (x == 1 && !verbose) { 120 isc_region_t region; 121 /* 122 * The unit letter is the last character in the 123 * used region of the buffer. 124 * 125 * toupper() does not need its argument to be masked of cast 126 * here because region.base is type unsigned char *. 127 */ 128 isc_buffer_usedregion(target, ®ion); 129 region.base[region.length - 1] = 130 toupper(region.base[region.length - 1]); 131 } 132 return (ISC_R_SUCCESS); 133} 134 135isc_result_t 136dns_counter_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) { 137 return (bind_ttl(source, ttl)); 138} 139 140isc_result_t 141dns_ttl_fromtext(isc_textregion_t *source, isc_uint32_t *ttl) { 142 isc_result_t result; 143 144 result = bind_ttl(source, ttl); 145 if (result != ISC_R_SUCCESS) 146 result = DNS_R_BADTTL; 147 return (result); 148} 149 150static isc_result_t 151bind_ttl(isc_textregion_t *source, isc_uint32_t *ttl) { 152 isc_uint32_t tmp = 0; 153 isc_uint32_t n; 154 char *s; 155 char buf[64]; 156 char nbuf[64]; /* Number buffer */ 157 158 /* 159 * Copy the buffer as it may not be NULL terminated. 160 * No legal counter / ttl is longer that 63 characters. 161 */ 162 if (source->length > sizeof(buf) - 1) 163 return (DNS_R_SYNTAX); 164 strncpy(buf, source->base, source->length); 165 buf[source->length] = '\0'; 166 s = buf; 167 168 do { 169 isc_result_t result; 170 171 char *np = nbuf; 172 while (*s != '\0' && isdigit((unsigned char)*s)) 173 *np++ = *s++; 174 *np++ = '\0'; 175 INSIST(np - nbuf <= (int)sizeof(nbuf)); 176 result = isc_parse_uint32(&n, nbuf, 10); 177 if (result != ISC_R_SUCCESS) 178 return (DNS_R_SYNTAX); 179 switch (*s) { 180 case 'w': 181 case 'W': 182 tmp += n * 7 * 24 * 3600; 183 s++; 184 break; 185 case 'd': 186 case 'D': 187 tmp += n * 24 * 3600; 188 s++; 189 break; 190 case 'h': 191 case 'H': 192 tmp += n * 3600; 193 s++; 194 break; 195 case 'm': 196 case 'M': 197 tmp += n * 60; 198 s++; 199 break; 200 case 's': 201 case 'S': 202 tmp += n; 203 s++; 204 break; 205 case '\0': 206 /* Plain number? */ 207 if (tmp != 0) 208 return (DNS_R_SYNTAX); 209 tmp = n; 210 break; 211 default: 212 return (DNS_R_SYNTAX); 213 } 214 } while (*s != '\0'); 215 *ttl = tmp; 216 return (ISC_R_SUCCESS); 217} 218