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 "extern.h" 63 #include "vary.h" 64 65 #ifndef TM_YEAR_BASE 66 #define TM_YEAR_BASE 1900 67 #endif 68 69 static time_t tval; 70 int retval; 71 72 static void badformat(void); 73 static void iso8601_usage(const char *); 74 static void multipleformats(void); 75 static void printdate(const char *); 76 static void printisodate(struct tm *); 77 static void setthetime(const char *, const char *, int, int); 78 static void usage(void); 79 80 static const struct iso8601_fmt { 81 const char *refname; 82 const char *format_string; 83 } iso8601_fmts[] = { 84 { "date", "%Y-%m-%d" }, 85 { "hours", "T%H" }, 86 { "minutes", ":%M" }, 87 { "seconds", ":%S" }, 88 }; 89 static const struct iso8601_fmt *iso8601_selected; 90 91 static const char *rfc2822_format = "%a, %d %b %Y %T %z"; 92 93 int 94 main(int argc, char *argv[]) 95 { 96 struct timezone tz; 97 int ch, rflag; 98 bool Iflag, jflag, nflag, Rflag; 99 const char *format; 100 char buf[1024]; 101 char *endptr, *fmt; 102 char *tmp; 103 int set_timezone; 104 struct vary *v; 105 const struct vary *badv; 106 struct tm *lt; 107 struct stat sb; 108 size_t i; 109 110 v = NULL; 111 fmt = NULL; 112 (void) setlocale(LC_TIME, ""); 113 tz.tz_dsttime = tz.tz_minuteswest = 0; 114 rflag = 0; 115 Iflag = jflag = nflag = Rflag = 0; 116 set_timezone = 0; 117 while ((ch = getopt(argc, argv, "d:f:I::jnRr:t:uv:")) != -1) 118 switch((char)ch) { 119 case 'd': /* daylight savings time */ 120 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 121 if (endptr == optarg || *endptr != '\0') 122 usage(); 123 set_timezone = 1; 124 break; 125 case 'f': 126 fmt = optarg; 127 break; 128 case 'I': 129 if (Rflag) 130 multipleformats(); 131 Iflag = 1; 132 if (optarg == NULL) { 133 iso8601_selected = iso8601_fmts; 134 break; 135 } 136 for (i = 0; i < nitems(iso8601_fmts); i++) 137 if (strcmp(optarg, iso8601_fmts[i].refname) == 0) 138 break; 139 if (i == nitems(iso8601_fmts)) 140 iso8601_usage(optarg); 141 142 iso8601_selected = &iso8601_fmts[i]; 143 break; 144 case 'j': 145 jflag = 1; /* don't set time */ 146 break; 147 case 'n': /* don't set network */ 148 nflag = 1; 149 break; 150 case 'R': /* RFC 2822 datetime format */ 151 if (Iflag) 152 multipleformats(); 153 Rflag = 1; 154 break; 155 case 'r': /* user specified seconds */ 156 rflag = 1; 157 tval = strtoq(optarg, &tmp, 0); 158 if (*tmp != 0) { 159 if (stat(optarg, &sb) == 0) 160 tval = sb.st_mtim.tv_sec; 161 else 162 usage(); 163 } 164 break; 165 case 't': /* minutes west of UTC */ 166 /* error check; don't allow "PST" */ 167 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 168 if (endptr == optarg || *endptr != '\0') 169 usage(); 170 set_timezone = 1; 171 break; 172 case 'u': /* do everything in UTC */ 173 (void)setenv("TZ", "UTC0", 1); 174 break; 175 case 'v': 176 v = vary_append(v, optarg); 177 break; 178 default: 179 usage(); 180 } 181 argc -= optind; 182 argv += optind; 183 184 /* 185 * If -d or -t, set the timezone or daylight savings time; this 186 * doesn't belong here; the kernel should not know about either. 187 */ 188 if (set_timezone && settimeofday(NULL, &tz) != 0) 189 err(1, "settimeofday (timezone)"); 190 191 if (!rflag && time(&tval) == -1) 192 err(1, "time"); 193 194 format = "%+"; 195 196 if (Rflag) 197 format = rfc2822_format; 198 199 /* allow the operands in any order */ 200 if (*argv && **argv == '+') { 201 if (Iflag) 202 multipleformats(); 203 format = *argv + 1; 204 ++argv; 205 } 206 207 if (*argv) { 208 setthetime(fmt, *argv, jflag, nflag); 209 ++argv; 210 } else if (fmt != NULL) 211 usage(); 212 213 if (*argv && **argv == '+') { 214 if (Iflag) 215 multipleformats(); 216 format = *argv + 1; 217 } 218 219 lt = localtime(&tval); 220 if (lt == NULL) 221 errx(1, "invalid time"); 222 badv = vary_apply(v, lt); 223 if (badv) { 224 fprintf(stderr, "%s: Cannot apply date adjustment\n", 225 badv->arg); 226 vary_destroy(v); 227 usage(); 228 } 229 vary_destroy(v); 230 231 if (Iflag) 232 printisodate(lt); 233 234 if (format == rfc2822_format) 235 /* 236 * When using RFC 2822 datetime format, don't honor the 237 * locale. 238 */ 239 setlocale(LC_TIME, "C"); 240 241 (void)strftime(buf, sizeof(buf), format, lt); 242 printdate(buf); 243 } 244 245 static void 246 printdate(const char *buf) 247 { 248 (void)printf("%s\n", buf); 249 if (fflush(stdout)) 250 err(1, "stdout"); 251 exit(retval); 252 } 253 254 static void 255 printisodate(struct tm *lt) 256 { 257 const struct iso8601_fmt *it; 258 char fmtbuf[32], buf[32], tzbuf[8]; 259 260 fmtbuf[0] = 0; 261 for (it = iso8601_fmts; it <= iso8601_selected; it++) 262 strlcat(fmtbuf, it->format_string, sizeof(fmtbuf)); 263 264 (void)strftime(buf, sizeof(buf), fmtbuf, lt); 265 266 if (iso8601_selected > iso8601_fmts) { 267 (void)strftime(tzbuf, sizeof(tzbuf), "%z", lt); 268 memmove(&tzbuf[4], &tzbuf[3], 3); 269 tzbuf[3] = ':'; 270 strlcat(buf, tzbuf, sizeof(buf)); 271 } 272 273 printdate(buf); 274 } 275 276 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 277 278 static void 279 setthetime(const char *fmt, const char *p, int jflag, int nflag) 280 { 281 struct utmpx utx; 282 struct tm *lt; 283 struct timeval tv; 284 const char *dot, *t; 285 int century; 286 287 lt = localtime(&tval); 288 if (lt == NULL) 289 errx(1, "invalid time"); 290 lt->tm_isdst = -1; /* divine correct DST */ 291 292 if (fmt != NULL) { 293 t = strptime(p, fmt, lt); 294 if (t == NULL) { 295 fprintf(stderr, "Failed conversion of ``%s''" 296 " using format ``%s''\n", p, fmt); 297 badformat(); 298 } else if (*t != '\0') 299 fprintf(stderr, "Warning: Ignoring %ld extraneous" 300 " characters in date string (%s)\n", 301 (long) strlen(t), t); 302 } else { 303 for (t = p, dot = NULL; *t; ++t) { 304 if (isdigit(*t)) 305 continue; 306 if (*t == '.' && dot == NULL) { 307 dot = t; 308 continue; 309 } 310 badformat(); 311 } 312 313 if (dot != NULL) { /* .ss */ 314 dot++; /* *dot++ = '\0'; */ 315 if (strlen(dot) != 2) 316 badformat(); 317 lt->tm_sec = ATOI2(dot); 318 if (lt->tm_sec > 61) 319 badformat(); 320 } else 321 lt->tm_sec = 0; 322 323 century = 0; 324 /* if p has a ".ss" field then let's pretend it's not there */ 325 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 326 case 12: /* cc */ 327 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 328 century = 1; 329 /* FALLTHROUGH */ 330 case 10: /* yy */ 331 if (century) 332 lt->tm_year += ATOI2(p); 333 else { 334 lt->tm_year = ATOI2(p); 335 if (lt->tm_year < 69) /* hack for 2000 ;-} */ 336 lt->tm_year += 2000 - TM_YEAR_BASE; 337 else 338 lt->tm_year += 1900 - TM_YEAR_BASE; 339 } 340 /* FALLTHROUGH */ 341 case 8: /* mm */ 342 lt->tm_mon = ATOI2(p); 343 if (lt->tm_mon > 12) 344 badformat(); 345 --lt->tm_mon; /* time struct is 0 - 11 */ 346 /* FALLTHROUGH */ 347 case 6: /* dd */ 348 lt->tm_mday = ATOI2(p); 349 if (lt->tm_mday > 31) 350 badformat(); 351 /* FALLTHROUGH */ 352 case 4: /* HH */ 353 lt->tm_hour = ATOI2(p); 354 if (lt->tm_hour > 23) 355 badformat(); 356 /* FALLTHROUGH */ 357 case 2: /* MM */ 358 lt->tm_min = ATOI2(p); 359 if (lt->tm_min > 59) 360 badformat(); 361 break; 362 default: 363 badformat(); 364 } 365 } 366 367 /* convert broken-down time to GMT clock time */ 368 if ((tval = mktime(lt)) == -1) 369 errx(1, "nonexistent time"); 370 371 if (!jflag) { 372 /* set the time */ 373 if (nflag || netsettime(tval)) { 374 utx.ut_type = OLD_TIME; 375 memset(utx.ut_id, 0, sizeof(utx.ut_id)); 376 (void)gettimeofday(&utx.ut_tv, NULL); 377 pututxline(&utx); 378 tv.tv_sec = tval; 379 tv.tv_usec = 0; 380 if (settimeofday(&tv, NULL) != 0) 381 err(1, "settimeofday (timeval)"); 382 utx.ut_type = NEW_TIME; 383 (void)gettimeofday(&utx.ut_tv, NULL); 384 pututxline(&utx); 385 } 386 387 if ((p = getlogin()) == NULL) 388 p = "???"; 389 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 390 } 391 } 392 393 static void 394 badformat(void) 395 { 396 warnx("illegal time format"); 397 usage(); 398 } 399 400 static void 401 iso8601_usage(const char *badarg) 402 { 403 errx(1, "invalid argument '%s' for -I", badarg); 404 } 405 406 static void 407 multipleformats(void) 408 { 409 errx(1, "multiple output formats specified"); 410 } 411 412 static void 413 usage(void) 414 { 415 (void)fprintf(stderr, "%s\n%s\n%s\n", 416 "usage: date [-jnRu] [-d dst] [-r seconds|file] [-t west] " 417 "[-v[+|-]val[ymwdHMS]]", 418 " " 419 "[-I[date | hours | minutes | seconds]]", 420 " " 421 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]" 422 ); 423 exit(1); 424 } 425