bin/date/date.c

   1 /* $NetBSD: date.c,v 1.61 2014/09/01 21:42:21 dholland Exp $ */
   2
   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 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT(
  35 "@(#) Copyright (c) 1985, 1987, 1988, 1993\
  36  The Regents of the University of California.  All rights reserved.");
  37 #endif /* not lint */
  38
  39 #ifndef lint
  40 #if 0
  41 static char sccsid[] = "@(#)date.c      8.2 (Berkeley) 4/28/95";
  42 #else
  43 __RCSID("$NetBSD: date.c,v 1.61 2014/09/01 21:42:21 dholland Exp $");
  44 #endif
  45 #endif /* not lint */
  46
  47 #include <sys/param.h>
  48 #include <sys/time.h>
  49
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <fcntl.h>
  53 #include <errno.h>
  54 #include <locale.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <syslog.h>
  59 #include <time.h>
  60 #include <tzfile.h>
  61 #include <unistd.h>
  62 #include <util.h>
  63
  64 #include "extern.h"
  65
  66 static time_t tval;
  67 static int aflag, jflag, rflag, nflag;
  68
  69 __dead static void badcanotime(const char *, const char *, size_t);
  70 static void setthetime(const char *);
  71 __dead static void usage(void);
  72
  73 int
  74 main(int argc, char *argv[])
  75 {
  76         char *buf;
  77         size_t bufsiz;
  78         const char *format;
  79         int ch;
  80         long long val;
  81         struct tm *tm;
  82
  83         setprogname(argv[0]);
  84         (void)setlocale(LC_ALL, "");
  85
  86         while ((ch = getopt(argc, argv, "ad:jnr:u")) != -1) {
  87                 switch (ch) {
  88                 case 'a':               /* adjust time slowly */
  89                         aflag = 1;
  90                         nflag = 1;
  91                         break;
  92                 case 'd':
  93 #if !defined(__minix)
  94                         rflag = 1;
  95                         tval = parsedate(optarg, NULL, NULL);
  96                         if (tval == -1) {
  97                                 errx(EXIT_FAILURE,
  98                                     "%s: Unrecognized date format", optarg);
  99                         }
 100 #else
 101                                 errx(EXIT_FAILURE,
 102                                     "%s: Unrecognized date format", optarg);
 103 #endif /* !defined(__minix) */
 104                         break;
 105                 case 'j':               /* don't set time */
 106                         jflag = 1;
 107                         break;
 108                 case 'n':               /* don't set network */
 109                         nflag = 1;
 110                         break;
 111                 case 'r':               /* user specified seconds */
 112                         if (optarg[0] == '\0') {
 113                                 errx(EXIT_FAILURE, "<empty>: Invalid number");
 114                         }
 115                         errno = 0;
 116                         val = strtoll(optarg, &buf, 0);
 117                         if (errno) {
 118                                 err(EXIT_FAILURE, "%s", optarg);
 119                         }
 120                         if (optarg[0] == '\0' || *buf != '\0') {
 121                                 errx(EXIT_FAILURE,
 122                                     "%s: Invalid number", optarg);
 123                         }
 124                         rflag = 1;
 125                         tval = (time_t)val;
 126                         break;
 127                 case 'u':               /* do everything in UTC */
 128                         (void)setenv("TZ", "UTC0", 1);
 129                         break;
 130                 default:
 131                         usage();
 132                 }
 133         }
 134         argc -= optind;
 135         argv += optind;
 136
 137         if (!rflag && time(&tval) == -1)
 138                 err(EXIT_FAILURE, "time");
 139
 140
 141         /* allow the operands in any order */
 142         if (*argv && **argv == '+') {
 143                 format = *argv;
 144                 ++argv;
 145         } else
 146                 format = "+%a %b %e %H:%M:%S %Z %Y";
 147
 148         if (*argv) {
 149                 setthetime(*argv);
 150                 ++argv;
 151         }
 152
 153         if (*argv && **argv == '+')
 154                 format = *argv;
 155
 156         if ((buf = malloc(bufsiz = 1024)) == NULL)
 157                 goto bad;
 158
 159         if ((tm = localtime(&tval)) == NULL)
 160                 err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
 161
 162         while (strftime(buf, bufsiz, format, tm) == 0)
 163                 if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
 164                         goto bad;
 165
 166         (void)printf("%s\n", buf + 1);
 167         free(buf);
 168         return 0;
 169 bad:
 170         err(EXIT_FAILURE, "Cannot allocate format buffer");
 171 }
 172
 173 static void
 174 badcanotime(const char *msg, const char *val, size_t where)
 175 {
 176         warnx("%s in canonical time", msg);
 177         warnx("%s", val);
 178         warnx("%*s", (int)where + 1, "^");
 179         usage();
 180 }
 181
 182 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 183
 184 static void
 185 setthetime(const char *p)
 186 {
 187         struct timeval tv;
 188         time_t new_time;
 189         struct tm *lt;
 190         const char *dot, *t, *op;
 191         size_t len;
 192         int yearset;
 193
 194         for (t = p, dot = NULL; *t; ++t) {
 195                 if (*t == '.') {
 196                         if (dot == NULL) {
 197                                 dot = t;
 198                         } else {
 199                                 badcanotime("Unexpected dot", p, t - p);
 200                         }
 201                 } else if (!isdigit((unsigned char)*t)) {
 202                         badcanotime("Expected digit", p, t - p);
 203                 }
 204         }
 205
 206         if ((lt = localtime(&tval)) == NULL)
 207                 err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
 208
 209         lt->tm_isdst = -1;                      /* Divine correct DST */
 210
 211         if (dot != NULL) {                      /* .ss */
 212                 len = strlen(dot);
 213                 if (len > 3) {
 214                         badcanotime("Unexpected digit after seconds field",
 215                                     p, strlen(p) - 1);
 216                 } else if (len < 3) {
 217                         badcanotime("Expected digit in seconds field",
 218                                     p, strlen(p));
 219                 }
 220                 ++dot;
 221                 lt->tm_sec = ATOI2(dot);
 222                 if (lt->tm_sec > 61)
 223                         badcanotime("Seconds out of range", p, strlen(p) - 1);
 224         } else {
 225                 len = 0;
 226                 lt->tm_sec = 0;
 227         }
 228
 229         op = p;
 230         yearset = 0;
 231         switch (strlen(p) - len) {
 232         case 12:                                /* cc */
 233                 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
 234                 if (lt->tm_year < 0)
 235                         badcanotime("Year before 1900", op, p - op + 1);
 236                 yearset = 1;
 237                 /* FALLTHROUGH */
 238         case 10:                                /* yy */
 239                 if (yearset) {
 240                         lt->tm_year += ATOI2(p);
 241                 } else {
 242                         yearset = ATOI2(p);
 243                         if (yearset < 69)
 244                                 lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
 245                         else
 246                                 lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
 247                 }
 248                 /* FALLTHROUGH */
 249         case 8:                                 /* mm */
 250                 lt->tm_mon = ATOI2(p);
 251                 if (lt->tm_mon > 12 || lt->tm_mon == 0)
 252                         badcanotime("Month out of range", op, p - op - 1);
 253                 --lt->tm_mon;                   /* time struct is 0 - 11 */
 254                 /* FALLTHROUGH */
 255         case 6:                                 /* dd */
 256                 lt->tm_mday = ATOI2(p);
 257                 switch (lt->tm_mon) {
 258                 case 0:
 259                 case 2:
 260                 case 4:
 261                 case 6:
 262                 case 7:
 263                 case 9:
 264                 case 11:
 265                         if (lt->tm_mday > 31 || lt->tm_mday == 0)
 266                                 badcanotime("Day out of range (max 31)",
 267                                             op, p - op - 1);
 268                         break;
 269                 case 3:
 270                 case 5:
 271                 case 8:
 272                 case 10:
 273                         if (lt->tm_mday > 30 || lt->tm_mday == 0)
 274                                 badcanotime("Day out of range (max 30)",
 275                                             op, p - op - 1);
 276                         break;
 277                 case 1:
 278                         if (isleap(lt->tm_year + TM_YEAR_BASE)) {
 279                                 if (lt->tm_mday > 29 || lt->tm_mday == 0) {
 280                                         badcanotime("Day out of range "
 281                                                     "(max 29)",
 282                                                     op, p - op - 1);
 283                                 }
 284                         } else {
 285                                 if (lt->tm_mday > 28 || lt->tm_mday == 0) {
 286                                         badcanotime("Day out of range "
 287                                                     "(max 28)",
 288                                                     op, p - op - 1);
 289                                 }
 290                         }
 291                         break;
 292                 default:
 293                         /*
 294                          * If the month was given, it's already been
 295                          * checked.  If a bad value came back from
 296                          * localtime, something's badly broken.
 297                          * (make this an assertion?)
 298                          */
 299                         errx(EXIT_FAILURE, "localtime gave invalid month %d",
 300                             lt->tm_mon);
 301                 }
 302                 /* FALLTHROUGH */
 303         case 4:                                 /* hh */
 304                 lt->tm_hour = ATOI2(p);
 305                 if (lt->tm_hour > 23)
 306                         badcanotime("Hour out of range", op, p - op - 1);
 307                 /* FALLTHROUGH */
 308         case 2:                                 /* mm */
 309                 lt->tm_min = ATOI2(p);
 310                 if (lt->tm_min > 59)
 311                         badcanotime("Minute out of range", op, p - op - 1);
 312                 break;
 313         case 0:                                 /* was just .sss */
 314                 if (len != 0)
 315                         break;
 316                 /* FALLTHROUGH */
 317         default:
 318             if (strlen(p) - len > 12) {
 319                     badcanotime("Too many digits", p, 12);
 320             } else {
 321                     badcanotime("Not enough digits", p, strlen(p) - len);
 322             }
 323         }
 324
 325         /* convert broken-down time to UTC clock time */
 326         if ((new_time = mktime(lt)) == -1) {
 327                 /* Can this actually happen? */
 328                 err(EXIT_FAILURE, "%s: mktime", op);
 329         }
 330
 331         /* if jflag is set, don't actually change the time, just return */
 332         if (jflag) {
 333                 tval = new_time;
 334                 return;
 335         }
 336
 337         /* set the time */
 338         if (nflag || netsettime(new_time)) {
 339                 logwtmp("|", "date", "");
 340                 if (aflag) {
 341                         tv.tv_sec = new_time - tval;
 342                         tv.tv_usec = 0;
 343                         if (adjtime(&tv, NULL))
 344                                 err(EXIT_FAILURE, "adjtime");
 345                 } else {
 346                         tval = new_time;
 347                         tv.tv_sec = tval;
 348                         tv.tv_usec = 0;
 349                         if (settimeofday(&tv, NULL))
 350                                 err(EXIT_FAILURE, "settimeofday");
 351                 }
 352                 logwtmp("{", "date", "");
 353         }
 354
 355         if ((p = getlogin()) == NULL)
 356                 p = "???";
 357         syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
 358 }
 359
 360 static void
 361 usage(void)
 362 {
 363         (void)fprintf(stderr,
 364             "Usage: %s [-ajnu] [-d date] [-r seconds] [+format]",
 365             getprogname());
 366         (void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
 367         exit(EXIT_FAILURE);
 368         /* NOTREACHED */
 369 }