1 /* $OpenBSD: date.c,v 1.43 2014/01/21 09:09:15 otto Exp $ */ 2 /* $NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1985, 1987, 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/types.h> 34 #include <sys/time.h> 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <fcntl.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <locale.h> 43 #include <syslog.h> 44 #include <time.h> 45 #include <tzfile.h> 46 #include <unistd.h> 47 #include <util.h> 48 49 extern char *__progname; 50 51 time_t tval; 52 int jflag; 53 int slidetime; 54 55 static void setthetime(char *); 56 static void badformat(void); 57 static void usage(void); 58 59 int 60 main(int argc, char *argv[]) 61 { 62 struct timezone tz; 63 struct tm *tp; 64 int ch, rflag; 65 char *format, buf[1024], *outzone = NULL; 66 67 setlocale(LC_ALL, ""); 68 69 tz.tz_dsttime = tz.tz_minuteswest = 0; 70 rflag = 0; 71 while ((ch = getopt(argc, argv, "ad:jr:ut:z:")) != -1) 72 switch(ch) { 73 case 'd': /* daylight saving time */ 74 tz.tz_dsttime = atoi(optarg) ? 1 : 0; 75 break; 76 case 'a': 77 slidetime++; 78 break; 79 case 'j': /* don't set */ 80 jflag = 1; 81 break; 82 case 'r': /* user specified seconds */ 83 rflag = 1; 84 tval = atoll(optarg); 85 break; 86 case 'u': /* do everything in UTC */ 87 if (setenv("TZ", "UTC", 1) == -1) 88 err(1, "cannot unsetenv TZ"); 89 break; 90 case 't': /* minutes west of GMT */ 91 /* error check; don't allow "PST" */ 92 if (isdigit((unsigned char)*optarg)) { 93 tz.tz_minuteswest = atoi(optarg); 94 break; 95 } 96 /* FALLTHROUGH */ 97 case 'z': 98 outzone = optarg; 99 break; 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 /* 107 * If -d or -t, set the timezone or daylight saving time; this 108 * doesn't belong here, the kernel should not know about either. 109 */ 110 if ((tz.tz_minuteswest || tz.tz_dsttime) && 111 settimeofday(NULL, &tz)) 112 err(1, "settimeofday"); 113 114 if (!rflag && time(&tval) == -1) 115 err(1, "time"); 116 117 format = "%a %b %e %H:%M:%S %Z %Y"; 118 119 /* allow the operands in any order */ 120 if (*argv && **argv == '+') { 121 format = *argv + 1; 122 argv++; 123 argc--; 124 } 125 126 if (*argv) { 127 setthetime(*argv); 128 argv++; 129 argc--; 130 } 131 132 if (*argv && **argv == '+') { 133 format = *argv + 1; 134 argc--; 135 } 136 137 if (argc > 0) 138 errx(1, "too many arguments"); 139 140 if (outzone) 141 setenv("TZ", outzone, 1); 142 143 tp = localtime(&tval); 144 if (tp == NULL) 145 errx(1, "conversion error"); 146 (void)strftime(buf, sizeof(buf), format, tp); 147 (void)printf("%s\n", buf); 148 exit(0); 149 } 150 151 #define ATOI2(ar) ((ar) += 2, ((ar)[-2] - '0') * 10 + ((ar)[-1] - '0')) 152 void 153 setthetime(char *p) 154 { 155 struct tm *lt; 156 struct timeval tv; 157 char *dot, *t; 158 int yearset = 0; 159 160 for (t = p, dot = NULL; *t; ++t) { 161 if (isdigit((unsigned char)*t)) 162 continue; 163 if (*t == '.' && dot == NULL) { 164 dot = t; 165 continue; 166 } 167 badformat(); 168 } 169 170 lt = localtime(&tval); 171 172 lt->tm_isdst = -1; /* correct for DST */ 173 174 if (dot != NULL) { /* .SS */ 175 *dot++ = '\0'; 176 if (strlen(dot) != 2) 177 badformat(); 178 lt->tm_sec = ATOI2(dot); 179 if (lt->tm_sec > 61) 180 badformat(); 181 } else 182 lt->tm_sec = 0; 183 184 switch (strlen(p)) { 185 case 12: /* cc */ 186 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 187 yearset = 1; 188 /* FALLTHROUGH */ 189 case 10: /* yy */ 190 if (!yearset) { 191 /* mask out current year, leaving only century */ 192 lt->tm_year = ((lt->tm_year / 100) * 100); 193 } 194 lt->tm_year += ATOI2(p); 195 /* FALLTHROUGH */ 196 case 8: /* mm */ 197 lt->tm_mon = ATOI2(p); 198 if ((lt->tm_mon > 12) || !lt->tm_mon) 199 badformat(); 200 --lt->tm_mon; /* time struct is 0 - 11 */ 201 /* FALLTHROUGH */ 202 case 6: /* dd */ 203 lt->tm_mday = ATOI2(p); 204 if ((lt->tm_mday > 31) || !lt->tm_mday) 205 badformat(); 206 /* FALLTHROUGH */ 207 case 4: /* HH */ 208 lt->tm_hour = ATOI2(p); 209 if (lt->tm_hour > 23) 210 badformat(); 211 /* FALLTHROUGH */ 212 case 2: /* MM */ 213 lt->tm_min = ATOI2(p); 214 if (lt->tm_min > 59) 215 badformat(); 216 break; 217 default: 218 badformat(); 219 } 220 221 /* convert broken-down time to UTC clock time */ 222 if ((tval = mktime(lt)) < 0) 223 errx(1, "specified date is outside allowed range"); 224 225 if (jflag) 226 return; 227 228 /* set the time */ 229 if (slidetime) { 230 struct timeval tv_current; 231 232 if (gettimeofday(&tv_current, NULL) == -1) 233 err(1, "Could not get local time of day"); 234 235 tv.tv_sec = tval - tv_current.tv_sec; 236 tv.tv_usec = 0; 237 if (adjtime(&tv, NULL) == -1) 238 errx(1, "adjtime"); 239 } else { 240 #ifndef SMALL 241 logwtmp("|", "date", ""); 242 #endif 243 tv.tv_sec = tval; 244 tv.tv_usec = 0; 245 if (settimeofday(&tv, NULL)) 246 err(1, "settimeofday"); 247 #ifndef SMALL 248 logwtmp("{", "date", ""); 249 #endif 250 } 251 252 if ((p = getlogin()) == NULL) 253 p = "???"; 254 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 255 } 256 257 static void 258 badformat(void) 259 { 260 warnx("illegal time format"); 261 usage(); 262 } 263 264 static void 265 usage(void) 266 { 267 (void)fprintf(stderr, 268 "usage: %s [-aju] [-d dst] [-r seconds] [-t minutes_west] [-z output_zone]\n", 269 __progname); 270 (void)fprintf(stderr, 271 "%-*s[+format] [[[[[[cc]yy]mm]dd]HH]MM[.SS]]\n", (int)strlen(__progname) + 8, ""); 272 exit(1); 273 } 274