1 /* $OpenBSD: date.c,v 1.49 2015/10/09 01:37:06 deraadt 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 <unistd.h> 46 #include <util.h> 47 48 extern char *__progname; 49 50 time_t tval; 51 int jflag; 52 int slidetime; 53 54 static void setthetime(char *); 55 static void badformat(void); 56 static void usage(void); 57 58 int 59 main(int argc, char *argv[]) 60 { 61 struct timezone tz; 62 const char *errstr; 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 = 1; 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 tz.tz_minuteswest = strtonum(optarg, 0, 24*60-1, &errstr); 92 if (errstr) 93 errx(1, "-t %s: %s", optarg, errstr); 94 break; 95 case 'z': 96 outzone = optarg; 97 break; 98 default: 99 usage(); 100 } 101 argc -= optind; 102 argv += optind; 103 104 /* 105 * If -d or -t, set the timezone or daylight saving time; this 106 * doesn't belong here, the kernel should not know about either. 107 */ 108 if ((tz.tz_minuteswest || tz.tz_dsttime) && 109 settimeofday(NULL, &tz)) 110 err(1, "settimeofday"); 111 112 if (!rflag && time(&tval) == -1) 113 err(1, "time"); 114 115 format = "%a %b %e %H:%M:%S %Z %Y"; 116 117 /* allow the operands in any order */ 118 if (*argv && **argv == '+') { 119 format = *argv + 1; 120 argv++; 121 argc--; 122 } 123 124 if (*argv) { 125 setthetime(*argv); 126 argv++; 127 argc--; 128 } 129 130 if (pledge("stdio rpath wpath", NULL) == -1) 131 err(1, "pledge"); 132 133 if (*argv && **argv == '+') { 134 format = *argv + 1; 135 argc--; 136 } 137 138 if (argc > 0) 139 errx(1, "too many arguments"); 140 141 if (outzone) 142 setenv("TZ", outzone, 1); 143 144 tp = localtime(&tval); 145 if (tp == NULL) 146 errx(1, "conversion error"); 147 (void)strftime(buf, sizeof(buf), format, tp); 148 (void)printf("%s\n", buf); 149 exit(0); 150 } 151 152 #define ATOI2(ar) ((ar) += 2, ((ar)[-2] - '0') * 10 + ((ar)[-1] - '0')) 153 void 154 setthetime(char *p) 155 { 156 struct tm *lt; 157 struct timeval tv; 158 char *dot, *t; 159 int yearset = 0; 160 161 for (t = p, dot = NULL; *t; ++t) { 162 if (isdigit((unsigned char)*t)) 163 continue; 164 if (*t == '.' && dot == NULL) { 165 dot = t; 166 continue; 167 } 168 badformat(); 169 } 170 171 lt = localtime(&tval); 172 173 lt->tm_isdst = -1; /* correct for DST */ 174 175 if (dot != NULL) { /* .SS */ 176 *dot++ = '\0'; 177 if (strlen(dot) != 2) 178 badformat(); 179 lt->tm_sec = ATOI2(dot); 180 if (lt->tm_sec > 61) 181 badformat(); 182 } else 183 lt->tm_sec = 0; 184 185 switch (strlen(p)) { 186 case 12: /* cc */ 187 lt->tm_year = (ATOI2(p) * 100) - 1900; 188 yearset = 1; 189 /* FALLTHROUGH */ 190 case 10: /* yy */ 191 if (!yearset) { 192 /* mask out current year, leaving only century */ 193 lt->tm_year = ((lt->tm_year / 100) * 100); 194 } 195 lt->tm_year += ATOI2(p); 196 /* FALLTHROUGH */ 197 case 8: /* mm */ 198 lt->tm_mon = ATOI2(p); 199 if ((lt->tm_mon > 12) || !lt->tm_mon) 200 badformat(); 201 --lt->tm_mon; /* time struct is 0 - 11 */ 202 /* FALLTHROUGH */ 203 case 6: /* dd */ 204 lt->tm_mday = ATOI2(p); 205 if ((lt->tm_mday > 31) || !lt->tm_mday) 206 badformat(); 207 /* FALLTHROUGH */ 208 case 4: /* HH */ 209 lt->tm_hour = ATOI2(p); 210 if (lt->tm_hour > 23) 211 badformat(); 212 /* FALLTHROUGH */ 213 case 2: /* MM */ 214 lt->tm_min = ATOI2(p); 215 if (lt->tm_min > 59) 216 badformat(); 217 break; 218 default: 219 badformat(); 220 } 221 222 /* convert broken-down time to UTC clock time */ 223 if ((tval = mktime(lt)) < 0) 224 errx(1, "specified date is outside allowed range"); 225 226 if (jflag) 227 return; 228 229 /* set the time */ 230 if (slidetime) { 231 struct timeval tv_current; 232 233 if (gettimeofday(&tv_current, NULL) == -1) 234 err(1, "Could not get local time of day"); 235 236 tv.tv_sec = tval - tv_current.tv_sec; 237 tv.tv_usec = 0; 238 if (adjtime(&tv, NULL) == -1) 239 errx(1, "adjtime"); 240 } else { 241 #ifndef SMALL 242 logwtmp("|", "date", ""); 243 #endif 244 tv.tv_sec = tval; 245 tv.tv_usec = 0; 246 if (settimeofday(&tv, NULL)) 247 err(1, "settimeofday"); 248 #ifndef SMALL 249 logwtmp("{", "date", ""); 250 #endif 251 } 252 253 if ((p = getlogin()) == NULL) 254 p = "???"; 255 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 256 } 257 258 static void 259 badformat(void) 260 { 261 warnx("illegal time format"); 262 usage(); 263 } 264 265 static void 266 usage(void) 267 { 268 (void)fprintf(stderr, 269 "usage: %s [-aju] [-d dst] [-r seconds] [-t minutes_west] [-z output_zone]\n", 270 __progname); 271 (void)fprintf(stderr, 272 "%-*s[+format] [[[[[[cc]yy]mm]dd]HH]MM[.SS]]\n", (int)strlen(__progname) + 8, ""); 273 exit(1); 274 } 275