date/date.c

   1 /*-
   2  * Copyright (c) 1985, 1987, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef lint
  31 static char const copyright[] =
  32 "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)date.c      8.2 (Berkeley) 4/28/95";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/stat.h>
  48
  49 #include <ctype.h>
  50 #include <err.h>
  51 #include <locale.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <syslog.h>
  56 #include <unistd.h>
  57 #include <utmpx.h>
  58
  59 #ifdef __APPLE__
  60 #include <get_compat.h>
  61 #else
  62 #define COMPAT_MODE(a,b) (1)
  63 #endif /* __APPLE__ */
  64
  65 #include "extern.h"
  66 #include "vary.h"
  67
  68 #ifndef TM_YEAR_BASE
  69 #define TM_YEAR_BASE    1900
  70 #endif
  71
  72 #ifdef __APPLE__
  73 #define st_mtim st_mtimespec
  74 #endif
  75
  76 static time_t tval;
  77 int retval;
  78 static int unix2003_std;        /* to determine legacy vs std mode */
  79
  80 static void setthetime(const char *, const char *, int, int);
  81 static void badformat(void);
  82 static void usage(void);
  83
  84 static const char *rfc2822_format = "%a, %d %b %Y %T %z";
  85
  86 int
  87 main(int argc, char *argv[])
  88 {
  89         struct timezone tz;
  90         int ch, rflag;
  91         int jflag, nflag, Rflag;
  92         const char *format;
  93         char buf[1024];
  94         char *endptr, *fmt;
  95         char *tmp;
  96         int set_timezone;
  97         struct vary *v;
  98         const struct vary *badv;
  99         struct tm lt;
 100         struct stat sb;
 101
 102         unix2003_std = COMPAT_MODE("bin/date", "unix2003");     /* Determine the STD */
 103
 104         v = NULL;
 105         fmt = NULL;
 106         (void) setlocale(LC_TIME, "");
 107         tz.tz_dsttime = tz.tz_minuteswest = 0;
 108         rflag = 0;
 109         jflag = nflag = Rflag = 0;
 110         set_timezone = 0;
 111         while ((ch = getopt(argc, argv, "d:f:jnRr:t:uv:")) != -1)
 112                 switch((char)ch) {
 113                 case 'd':               /* daylight savings time */
 114                         tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0;
 115                         if (endptr == optarg || *endptr != '\0')
 116                                 usage();
 117                         set_timezone = 1;
 118                         break;
 119                 case 'f':
 120                         fmt = optarg;
 121                         break;
 122                 case 'j':
 123                         jflag = 1;      /* don't set time */
 124                         break;
 125                 case 'n':               /* don't set network */
 126                         nflag = 1;
 127                         break;
 128                 case 'R':               /* RFC 2822 datetime format */
 129                         Rflag = 1;
 130                         break;
 131                 case 'r':               /* user specified seconds */
 132                         rflag = 1;
 133                         tval = strtoq(optarg, &tmp, 0);
 134                         if (*tmp != 0) {
 135                                 if (stat(optarg, &sb) == 0)
 136                                         tval = sb.st_mtim.tv_sec;
 137                                 else
 138                                         usage();
 139                         }
 140                         break;
 141                 case 't':               /* minutes west of UTC */
 142                                         /* error check; don't allow "PST" */
 143                         tz.tz_minuteswest = strtol(optarg, &endptr, 10);
 144                         if (endptr == optarg || *endptr != '\0')
 145                                 usage();
 146                         set_timezone = 1;
 147                         break;
 148                 case 'u':               /* do everything in UTC */
 149                         (void)setenv("TZ", "UTC0", 1);
 150                         break;
 151                 case 'v':
 152                         v = vary_append(v, optarg);
 153                         break;
 154                 default:
 155                         usage();
 156                 }
 157         argc -= optind;
 158         argv += optind;
 159
 160         /*
 161          * If -d or -t, set the timezone or daylight savings time; this
 162          * doesn't belong here; the kernel should not know about either.
 163          */
 164         if (set_timezone && settimeofday(NULL, &tz) != 0)
 165                 err(1, "settimeofday (timezone)");
 166
 167         if (!rflag && time(&tval) == -1)
 168                 err(1, "time");
 169
 170         format = "%+";
 171
 172         if (Rflag)
 173                 format = rfc2822_format;
 174
 175         /* allow the operands in any order */
 176         if (*argv && **argv == '+') {
 177                 format = *argv + 1;
 178                 ++argv;
 179         }
 180
 181         if (*argv) {
 182                 setthetime(fmt, *argv, jflag, nflag);
 183                 ++argv;
 184         } else if (fmt != NULL)
 185                 usage();
 186
 187         if (*argv && **argv == '+')
 188                 format = *argv + 1;
 189
 190 #ifdef __APPLE__
 191         /* 7999711 */
 192         struct tm *ltp = localtime(&tval);
 193         if (ltp == NULL) {
 194                 err(1, "localtime");
 195         }
 196         lt = *ltp;
 197 #else
 198         lt = *localtime(&tval);
 199 #endif
 200         badv = vary_apply(v, &lt);
 201         if (badv) {
 202                 fprintf(stderr, "%s: Cannot apply date adjustment\n",
 203                         badv->arg);
 204                 vary_destroy(v);
 205                 usage();
 206         }
 207         vary_destroy(v);
 208
 209         if (format == rfc2822_format)
 210                 /*
 211                  * When using RFC 2822 datetime format, don't honor the
 212                  * locale.
 213                  */
 214                 setlocale(LC_TIME, "C");
 215
 216         (void)strftime(buf, sizeof(buf), format, &lt);
 217         (void)printf("%s\n", buf);
 218         if (fflush(stdout))
 219                 err(1, "stdout");
 220         /*
 221          * If date/time could not be set/notified in the other hosts as
 222          * determined by netsetval(), a return value 2 is set, which is
 223          * only propagated back to shell in legacy mode.
 224          */
 225         if (unix2003_std)
 226                 exit(0);
 227         exit(retval);
 228 }
 229
 230 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 231 #define ATOI2_OFFSET(s, o)      (((s)[o] - '0') * 10 + ((s)[o + 1] - '0'))
 232
 233 static void
 234 setthetime(const char *fmt, const char *p, int jflag, int nflag)
 235 {
 236         struct utmpx utx;
 237         struct tm *lt;
 238         struct timeval tv;
 239         const char *dot, *t;
 240         int century;
 241         size_t length;
 242
 243         lt = localtime(&tval);
 244         lt->tm_isdst = -1;              /* divine correct DST */
 245
 246         if (fmt != NULL) {
 247                 t = strptime(p, fmt, lt);
 248                 if (t == NULL) {
 249                         fprintf(stderr, "Failed conversion of ``%s''"
 250                                 " using format ``%s''\n", p, fmt);
 251                         badformat();
 252                 } else if (*t != '\0')
 253                         fprintf(stderr, "Warning: Ignoring %ld extraneous"
 254                                 " characters in date string (%s)\n",
 255                                 (long) strlen(t), t);
 256         } else {
 257                 for (t = p, dot = NULL; *t; ++t) {
 258                         if (isdigit(*t))
 259                                 continue;
 260                         if (*t == '.' && dot == NULL) {
 261                                 dot = t;
 262                                 continue;
 263                         }
 264                         badformat();
 265                 }
 266
 267                 if (dot != NULL) {                      /* .ss */
 268                         dot++; /* *dot++ = '\0'; */
 269                         if (strlen(dot) != 2)
 270                                 badformat();
 271                         lt->tm_sec = ATOI2(dot);
 272                         if (lt->tm_sec > 61)
 273                                 badformat();
 274                 } else
 275                         lt->tm_sec = 0;
 276
 277                 century = 0;
 278                 /* if p has a ".ss" field then let's pretend it's not there */
 279                 switch (length = strlen(p) - ((dot != NULL) ? 3 : 0)) {
 280                 case 12:                                /* cc */
 281                         lt->tm_year = (unix2003_std ? ATOI2_OFFSET(p, length - 4) : ATOI2(p)) * 100 - TM_YEAR_BASE;
 282                         century = 1;
 283                         /* FALLTHROUGH */
 284                 case 10:                                /* yy */
 285                         if (century)
 286                                 lt->tm_year += (unix2003_std ? ATOI2_OFFSET(p, length - 2) : ATOI2(p));
 287                         else {
 288                                 lt->tm_year = (unix2003_std ? ATOI2_OFFSET(p, length - 2) : ATOI2(p));
 289                                 if (lt->tm_year < 69)   /* hack for 2000 ;-} */
 290                                         lt->tm_year += 2000 - TM_YEAR_BASE;
 291                                 else
 292                                         lt->tm_year += 1900 - TM_YEAR_BASE;
 293                         }
 294                         /* FALLTHROUGH */
 295                 case 8:                                 /* mm */
 296                         lt->tm_mon = ATOI2(p);
 297                         if (lt->tm_mon > 12)
 298                                 badformat();
 299                         --lt->tm_mon;           /* time struct is 0 - 11 */
 300                         /* FALLTHROUGH */
 301                 case 6:                                 /* dd */
 302                         lt->tm_mday = ATOI2(p);
 303                         if (lt->tm_mday > 31)
 304                                 badformat();
 305                         /* FALLTHROUGH */
 306                 case 4:                                 /* HH */
 307                         lt->tm_hour = ATOI2(p);
 308                         if (lt->tm_hour > 23)
 309                                 badformat();
 310                         /* FALLTHROUGH */
 311                 case 2:                                 /* MM */
 312                         lt->tm_min = ATOI2(p);
 313                         if (lt->tm_min > 59)
 314                                 badformat();
 315                         break;
 316                 default:
 317                         badformat();
 318                 }
 319         }
 320
 321         /* convert broken-down time to GMT clock time */
 322         if ((tval = mktime(lt)) == -1)
 323                 errx(1, "nonexistent time");
 324
 325         if (!jflag) {
 326                 /* set the time */
 327                 if (nflag || netsettime(tval)) {
 328                         utx.ut_type = OLD_TIME;
 329                         (void)gettimeofday(&utx.ut_tv, NULL);
 330                         pututxline(&utx);
 331                         tv.tv_sec = tval;
 332                         tv.tv_usec = 0;
 333                         if (settimeofday(&tv, NULL) != 0)
 334                                 err(1, "settimeofday (timeval)");
 335                         utx.ut_type = NEW_TIME;
 336                         (void)gettimeofday(&utx.ut_tv, NULL);
 337                         pututxline(&utx);
 338                 }
 339
 340                 if ((p = getlogin()) == NULL)
 341                         p = "???";
 342                 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 343         }
 344 }
 345
 346 static void
 347 badformat(void)
 348 {
 349         warnx("illegal time format");
 350         usage();
 351 }
 352
 353 static void
 354 usage(void)
 355 {
 356         (void)fprintf(stderr, "%s\n%s\n",
 357             "usage: date [-jnRu] [-d dst] [-r seconds] [-t west] "
 358             "[-v[+|-]val[ymwdHMS]] ... ",
 359             unix2003_std ?
 360             "            "
 361             "[-f fmt date | [[[mm]dd]HH]MM[[cc]yy][.ss]] [+format]" :
 362             "            "
 363             "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]");
 364         exit(1);
 365 }