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 <stdbool.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <syslog.h> 59 #include <unistd.h> 60 #include <utmpx.h> 61 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 70 static void badformat(void); 71 static void iso8601_usage(const char *); 72 static void multipleformats(void); 73 static void printdate(const char *); 74 static void printisodate(struct tm *); 75 static void setthetime(const char *, const char *, int, int); 76 static void usage(void); 77 78 static const struct iso8601_fmt { 79 const char *refname; 80 const char *format_string; 81 } iso8601_fmts[] = { 82 { "date", "%Y-%m-%d" }, 83 { "hours", "T%H" }, 84 { "minutes", ":%M" }, 85 { "seconds", ":%S" }, 86 }; 87 static const struct iso8601_fmt *iso8601_selected; 88 89 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 90 91 int 92 main(int argc, char *argv[]) 93 { 94 struct timezone tz; 95 int ch, rflag; 96 bool Iflag, jflag, nflag, Rflag; 97 const char *format; 98 char buf[1024]; 99 char *endptr, *fmt; 100 char *tmp; 101 int set_timezone; 102 struct vary *v; 103 const struct vary *badv; 104 struct tm *lt; 105 struct stat sb; 106 size_t i; 107 108 v = NULL; 109 fmt = NULL; 110 (void) setlocale(LC_TIME, ""); 111 tz.tz_dsttime = tz.tz_minuteswest = 0; 112 rflag = 0; 113 Iflag = jflag = nflag = Rflag = 0; 114 set_timezone = 0; 115 while ((ch = getopt(argc, argv, "d:f:I::jnRr:t:uv:")) != -1) 116 switch((char)ch) { 117 case 'd': /* daylight savings time */ 118 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 119 if (endptr == optarg || *endptr != '\0') 120 usage(); 121 set_timezone = 1; 122 break; 123 case 'f': 124 fmt = optarg; 125 break; 126 case 'I': 127 if (Rflag) 128 multipleformats(); 129 Iflag = 1; 130 if (optarg == NULL) { 131 iso8601_selected = iso8601_fmts; 132 break; 133 } 134 for (i = 0; i < nitems(iso8601_fmts); i++) 135 if (strcmp(optarg, iso8601_fmts[i].refname) == 0) 136 break; 137 if (i == nitems(iso8601_fmts)) 138 iso8601_usage(optarg); 139 140 iso8601_selected = &iso8601_fmts[i]; 141 break; 142 case 'j': 143 jflag = 1; /* don't set time */ 144 break; 145 case 'n': /* don't set network */ 146 nflag = 1; 147 break; 148 case 'R': /* RFC 2822 datetime format */ 149 if (Iflag) 150 multipleformats(); 151 Rflag = 1; 152 break; 153 case 'r': /* user specified seconds */ 154 rflag = 1; 155 tval = strtoq(optarg, &tmp, 0); 156 if (*tmp != 0) { 157 if (stat(optarg, &sb) == 0) 158 tval = sb.st_mtim.tv_sec; 159 else 160 usage(); 161 } 162 break; 163 case 't': /* minutes west of UTC */ 164 /* error check; don't allow "PST" */ 165 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 166 if (endptr == optarg || *endptr != '\0') 167 usage(); 168 set_timezone = 1; 169 break; 170 case 'u': /* do everything in UTC */ 171 (void)setenv("TZ", "UTC0", 1); 172 break; 173 case 'v': 174 v = vary_append(v, optarg); 175 break; 176 default: 177 usage(); 178 } 179 argc -= optind; 180 argv += optind; 181 182 /* 183 * If -d or -t, set the timezone or daylight savings time; this 184 * doesn't belong here; the kernel should not know about either. 185 */ 186 if (set_timezone && settimeofday(NULL, &tz) != 0) 187 err(1, "settimeofday (timezone)"); 188 189 if (!rflag && time(&tval) == -1) 190 err(1, "time"); 191 192 format = "%+"; 193 194 if (Rflag) 195 format = rfc2822_format; 196 197 /* allow the operands in any order */ 198 if (*argv && **argv == '+') { 199 if (Iflag) 200 multipleformats(); 201 format = *argv + 1; 202 ++argv; 203 } 204 205 if (*argv) { 206 setthetime(fmt, *argv, jflag, nflag); 207 ++argv; 208 } else if (fmt != NULL) 209 usage(); 210 211 if (*argv && **argv == '+') { 212 if (Iflag) 213 multipleformats(); 214 format = *argv + 1; 215 } 216 217 lt = localtime(&tval); 218 if (lt == NULL) 219 errx(1, "invalid time"); 220 badv = vary_apply(v, lt); 221 if (badv) { 222 fprintf(stderr, "%s: Cannot apply date adjustment\n", 223 badv->arg); 224 vary_destroy(v); 225 usage(); 226 } 227 vary_destroy(v); 228 229 if (Iflag) 230 printisodate(lt); 231 232 if (format == rfc2822_format) 233 /* 234 * When using RFC 2822 datetime format, don't honor the 235 * locale. 236 */ 237 setlocale(LC_TIME, "C"); 238 239 (void)strftime(buf, sizeof(buf), format, lt); 240 printdate(buf); 241 } 242 243 static void 244 printdate(const char *buf) 245 { 246 (void)printf("%s\n", buf); 247 if (fflush(stdout)) 248 err(1, "stdout"); 249 exit(EXIT_SUCCESS); 250 } 251 252 static void 253 printisodate(struct tm *lt) 254 { 255 const struct iso8601_fmt *it; 256 char fmtbuf[32], buf[32], tzbuf[8]; 257 258 fmtbuf[0] = 0; 259 for (it = iso8601_fmts; it <= iso8601_selected; it++) 260 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 261 262 (void)strftime(buf, sizeof(buf), fmtbuf, lt); 263 264 if (iso8601_selected > iso8601_fmts) { 265 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt); 266 memmove(&tzbuf[4], &tzbuf[3], 3); 267 tzbuf[3] = ':'; 268 strlcat(buf, tzbuf, sizeof(buf)); 269 } 270 271 printdate(buf); 272 } 273 274 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 275 276 static void 277 setthetime(const char *fmt, const char *p, int jflag, int nflag) 278 { 279 struct utmpx utx; 280 struct tm *lt; 281 struct timeval tv; 282 const char *dot, *t; 283 int century; 284 285 lt = localtime(&tval); 286 if (lt == NULL) 287 errx(1, "invalid time"); 288 lt->tm_isdst = -1; /* divine correct DST */ 289 290 if (fmt != NULL) { 291 t = strptime(p, fmt, lt); 292 if (t == NULL) { 293 fprintf(stderr, "Failed conversion of ``%s''" 294 " using format ``%s''\n", p, fmt); 295 badformat(); 296 } else if (*t != '\0') 297 fprintf(stderr, "Warning: Ignoring %ld extraneous" 298 " characters in date string (%s)\n", 299 (long) strlen(t), t); 300 } else { 301 for (t = p, dot = NULL; *t; ++t) { 302 if (isdigit(*t)) 303 continue; 304 if (*t == '.' && dot == NULL) { 305 dot = t; 306 continue; 307 } 308 badformat(); 309 } 310 311 if (dot != NULL) { /* .ss */ 312 dot++; /* *dot++ = '\0'; */ 313 if (strlen(dot) != 2) 314 badformat(); 315 lt->tm_sec = ATOI2(dot); 316 if (lt->tm_sec > 61) 317 badformat(); 318 } else 319 lt->tm_sec = 0; 320 321 century = 0; 322 /* if p has a ".ss" field then let's pretend it's not there */ 323 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 324 case 12: /* cc */ 325 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 326 century = 1; 327 /* FALLTHROUGH */ 328 case 10: /* yy */ 329 if (century) 330 lt->tm_year += ATOI2(p); 331 else { 332 lt->tm_year = ATOI2(p); 333 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 334 lt->tm_year += 2000 - TM_YEAR_BASE; 335 else 336 lt->tm_year += 1900 - TM_YEAR_BASE; 337 } 338 /* FALLTHROUGH */ 339 case 8: /* mm */ 340 lt->tm_mon = ATOI2(p); 341 if (lt->tm_mon > 12) 342 badformat(); 343 --lt->tm_mon; /* time struct is 0 - 11 */ 344 /* FALLTHROUGH */ 345 case 6: /* dd */ 346 lt->tm_mday = ATOI2(p); 347 if (lt->tm_mday > 31) 348 badformat(); 349 /* FALLTHROUGH */ 350 case 4: /* HH */ 351 lt->tm_hour = ATOI2(p); 352 if (lt->tm_hour > 23) 353 badformat(); 354 /* FALLTHROUGH */ 355 case 2: /* MM */ 356 lt->tm_min = ATOI2(p); 357 if (lt->tm_min > 59) 358 badformat(); 359 break; 360 default: 361 badformat(); 362 } 363 } 364 365 /* convert broken-down time to GMT clock time */ 366 if ((tval = mktime(lt)) == -1) 367 errx(1, "nonexistent time"); 368 369 if (!jflag) { 370 /* set the time */ 371 if (nflag) { 372 utx.ut_type = OLD_TIME; 373 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 374 (void)gettimeofday(&utx.ut_tv, NULL); 375 pututxline(&utx); 376 tv.tv_sec = tval; 377 tv.tv_usec = 0; 378 if (settimeofday(&tv, NULL) != 0) 379 err(1, "settimeofday (timeval)"); 380 utx.ut_type = NEW_TIME; 381 (void)gettimeofday(&utx.ut_tv, NULL); 382 pututxline(&utx); 383 } 384 385 if ((p = getlogin()) == NULL) 386 p = "???"; 387 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 388 } 389 } 390 391 static void 392 badformat(void) 393 { 394 warnx("illegal time format"); 395 usage(); 396 } 397 398 static void 399 iso8601_usage(const char *badarg) 400 { 401 errx(1, "invalid argument '%s' for -I", badarg); 402 } 403 404 static void 405 multipleformats(void) 406 { 407 errx(1, "multiple output formats specified"); 408 } 409 410 static void 411 usage(void) 412 { 413 (void)fprintf(stderr, "%s\n%s\n%s\n", 414 "usage: date [-jnRu] [-d dst] [-r seconds|file] [-t west] " 415 "[-v[+|-]val[ymwdHMS]]", 416 " " 417 "[-I[date | hours | minutes | seconds]]", 418 " " 419 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]" 420 ); 421 exit(1); 422 } 423