1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1985, 1987, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static char const copyright[] = 34 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/param.h> 48 #include <sys/time.h> 49 #include <sys/stat.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <locale.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <unistd.h> 59 #include <utmpx.h> 60 61 #include "extern.h" 62 #include "vary.h" 63 64 #ifndef TM_YEAR_BASE 65 #define TM_YEAR_BASE 1900 66 #endif 67 68 static time_t tval; 69 int retval; 70 71 static void setthetime(const char *, const char *, int, int); 72 static void badformat(void); 73 static void usage(void); 74 75 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 76 77 int 78 main(int argc, char *argv[]) 79 { 80 struct timezone tz; 81 int ch, rflag; 82 int jflag, nflag, Rflag; 83 const char *format; 84 char buf[1024]; 85 char *endptr, *fmt; 86 char *tmp; 87 int set_timezone; 88 struct vary *v; 89 const struct vary *badv; 90 struct tm *lt; 91 struct stat sb; 92 93 v = NULL; 94 fmt = NULL; 95 (void) setlocale(LC_TIME, ""); 96 tz.tz_dsttime = tz.tz_minuteswest = 0; 97 rflag = 0; 98 jflag = nflag = Rflag = 0; 99 set_timezone = 0; 100 while ((ch = getopt(argc, argv, "d:f:jnRr:t:uv:")) != -1) 101 switch((char)ch) { 102 case 'd': /* daylight savings time */ 103 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 104 if (endptr == optarg || *endptr != '\0') 105 usage(); 106 set_timezone = 1; 107 break; 108 case 'f': 109 fmt = optarg; 110 break; 111 case 'j': 112 jflag = 1; /* don't set time */ 113 break; 114 case 'n': /* don't set network */ 115 nflag = 1; 116 break; 117 case 'R': /* RFC 2822 datetime format */ 118 Rflag = 1; 119 break; 120 case 'r': /* user specified seconds */ 121 rflag = 1; 122 tval = strtoq(optarg, &tmp, 0); 123 if (*tmp != 0) { 124 if (stat(optarg, &sb) == 0) 125 tval = sb.st_mtim.tv_sec; 126 else 127 usage(); 128 } 129 break; 130 case 't': /* minutes west of UTC */ 131 /* error check; don't allow "PST" */ 132 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 133 if (endptr == optarg || *endptr != '\0') 134 usage(); 135 set_timezone = 1; 136 break; 137 case 'u': /* do everything in UTC */ 138 (void)setenv("TZ", "UTC0", 1); 139 break; 140 case 'v': 141 v = vary_append(v, optarg); 142 break; 143 default: 144 usage(); 145 } 146 argc -= optind; 147 argv += optind; 148 149 /* 150 * If -d or -t, set the timezone or daylight savings time; this 151 * doesn't belong here; the kernel should not know about either. 152 */ 153 if (set_timezone && settimeofday(NULL, &tz) != 0) 154 err(1, "settimeofday (timezone)"); 155 156 if (!rflag && time(&tval) == -1) 157 err(1, "time"); 158 159 format = "%+"; 160 161 if (Rflag) 162 format = rfc2822_format; 163 164 /* allow the operands in any order */ 165 if (*argv && **argv == '+') { 166 format = *argv + 1; 167 ++argv; 168 } 169 170 if (*argv) { 171 setthetime(fmt, *argv, jflag, nflag); 172 ++argv; 173 } else if (fmt != NULL) 174 usage(); 175 176 if (*argv && **argv == '+') 177 format = *argv + 1; 178 179 lt = localtime(&tval); 180 if (lt == NULL) 181 errx(1, "invalid time"); 182 badv = vary_apply(v, lt); 183 if (badv) { 184 fprintf(stderr, "%s: Cannot apply date adjustment\n", 185 badv->arg); 186 vary_destroy(v); 187 usage(); 188 } 189 vary_destroy(v); 190 191 if (format == rfc2822_format) 192 /* 193 * When using RFC 2822 datetime format, don't honor the 194 * locale. 195 */ 196 setlocale(LC_TIME, "C"); 197 198 (void)strftime(buf, sizeof(buf), format, lt); 199 (void)printf("%s\n", buf); 200 if (fflush(stdout)) 201 err(1, "stdout"); 202 exit(retval); 203 } 204 205 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 206 207 static void 208 setthetime(const char *fmt, const char *p, int jflag, int nflag) 209 { 210 struct utmpx utx; 211 struct tm *lt; 212 struct timeval tv; 213 const char *dot, *t; 214 int century; 215 216 lt = localtime(&tval); 217 if (lt == NULL) 218 errx(1, "invalid time"); 219 lt->tm_isdst = -1; /* divine correct DST */ 220 221 if (fmt != NULL) { 222 t = strptime(p, fmt, lt); 223 if (t == NULL) { 224 fprintf(stderr, "Failed conversion of ``%s''" 225 " using format ``%s''\n", p, fmt); 226 badformat(); 227 } else if (*t != '\0') 228 fprintf(stderr, "Warning: Ignoring %ld extraneous" 229 " characters in date string (%s)\n", 230 (long) strlen(t), t); 231 } else { 232 for (t = p, dot = NULL; *t; ++t) { 233 if (isdigit(*t)) 234 continue; 235 if (*t == '.' && dot == NULL) { 236 dot = t; 237 continue; 238 } 239 badformat(); 240 } 241 242 if (dot != NULL) { /* .ss */ 243 dot++; /* *dot++ = '\0'; */ 244 if (strlen(dot) != 2) 245 badformat(); 246 lt->tm_sec = ATOI2(dot); 247 if (lt->tm_sec > 61) 248 badformat(); 249 } else 250 lt->tm_sec = 0; 251 252 century = 0; 253 /* if p has a ".ss" field then let's pretend it's not there */ 254 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 255 case 12: /* cc */ 256 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 257 century = 1; 258 /* FALLTHROUGH */ 259 case 10: /* yy */ 260 if (century) 261 lt->tm_year += ATOI2(p); 262 else { 263 lt->tm_year = ATOI2(p); 264 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 265 lt->tm_year += 2000 - TM_YEAR_BASE; 266 else 267 lt->tm_year += 1900 - TM_YEAR_BASE; 268 } 269 /* FALLTHROUGH */ 270 case 8: /* mm */ 271 lt->tm_mon = ATOI2(p); 272 if (lt->tm_mon > 12) 273 badformat(); 274 --lt->tm_mon; /* time struct is 0 - 11 */ 275 /* FALLTHROUGH */ 276 case 6: /* dd */ 277 lt->tm_mday = ATOI2(p); 278 if (lt->tm_mday > 31) 279 badformat(); 280 /* FALLTHROUGH */ 281 case 4: /* HH */ 282 lt->tm_hour = ATOI2(p); 283 if (lt->tm_hour > 23) 284 badformat(); 285 /* FALLTHROUGH */ 286 case 2: /* MM */ 287 lt->tm_min = ATOI2(p); 288 if (lt->tm_min > 59) 289 badformat(); 290 break; 291 default: 292 badformat(); 293 } 294 } 295 296 /* convert broken-down time to GMT clock time */ 297 if ((tval = mktime(lt)) == -1) 298 errx(1, "nonexistent time"); 299 300 if (!jflag) { 301 /* set the time */ 302 if (nflag || netsettime(tval)) { 303 utx.ut_type = OLD_TIME; 304 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 305 (void)gettimeofday(&utx.ut_tv, NULL); 306 pututxline(&utx); 307 tv.tv_sec = tval; 308 tv.tv_usec = 0; 309 if (settimeofday(&tv, NULL) != 0) 310 err(1, "settimeofday (timeval)"); 311 utx.ut_type = NEW_TIME; 312 (void)gettimeofday(&utx.ut_tv, NULL); 313 pututxline(&utx); 314 } 315 316 if ((p = getlogin()) == NULL) 317 p = "???"; 318 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 319 } 320 } 321 322 static void 323 badformat(void) 324 { 325 warnx("illegal time format"); 326 usage(); 327 } 328 329 static void 330 usage(void) 331 { 332 (void)fprintf(stderr, "%s\n%s\n", 333 "usage: date [-jnRu] [-d dst] [-r seconds] [-t west] " 334 "[-v[+|-]val[ymwdHMS]] ... ", 335 " " 336 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 337 exit(1); 338 } 339