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 * 3. 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 * @(#) Copyright (c) 1985, 1987, 1988, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)date.c 8.2 (Berkeley) 4/28/95 31 * $FreeBSD: src/bin/date/date.c,v 1.47 2005/01/10 08:39:21 imp Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/time.h> 36 37 #include <ctype.h> 38 #include <err.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <syslog.h> 43 #include <unistd.h> 44 #include <locale.h> 45 #include <libutil.h> 46 47 #include "extern.h" 48 #include "vary.h" 49 50 #ifndef TM_YEAR_BASE 51 #define TM_YEAR_BASE 1900 52 #endif 53 54 static time_t tval; 55 int retval; 56 57 static void setthetime(const char *, const char *, int, int); 58 static void badformat(void); 59 static void usage(void); 60 61 static const char *rfc2822_format ="%a, %d %b %Y %T %z"; 62 63 int 64 main(int argc, char **argv) 65 { 66 struct timezone tz; 67 int ch, rflag; 68 int jflag, nflag, Rflag; 69 const char *format; 70 char buf[1024]; 71 char *endptr, *fmt; 72 char *tmp; 73 int set_timezone; 74 struct vary *v; 75 const struct vary *badv; 76 struct tm lt; 77 78 v = NULL; 79 fmt = NULL; 80 setlocale(LC_TIME, ""); 81 tz.tz_dsttime = tz.tz_minuteswest = 0; 82 rflag = 0; 83 jflag = nflag = Rflag = 0; 84 set_timezone = 0; 85 while ((ch = getopt(argc, argv, "d:f:jnRr:t:uv:")) != -1) 86 switch(ch) { 87 case 'd': /* daylight savings time */ 88 tz.tz_dsttime = strtol(optarg, &endptr, 10) ? 1 : 0; 89 if (endptr == optarg || *endptr != '\0') 90 usage(); 91 set_timezone = 1; 92 break; 93 case 'f': 94 fmt = optarg; 95 break; 96 case 'j': 97 jflag = 1; /* don't set time */ 98 break; 99 case 'n': /* don't set network */ 100 nflag = 1; 101 break; 102 case 'R': 103 Rflag = 1; /*RFC 2822 datetime format */ 104 break; 105 case 'r': /* user specified seconds */ 106 rflag = 1; 107 tval = strtoll(optarg, &tmp, 0); 108 if (*tmp != 0) 109 usage(); 110 break; 111 case 't': /* minutes west of UTC */ 112 /* error check; don't allow "PST" */ 113 tz.tz_minuteswest = strtol(optarg, &endptr, 10); 114 if (endptr == optarg || *endptr != '\0') 115 usage(); 116 set_timezone = 1; 117 break; 118 case 'u': /* do everything in UTC */ 119 if (setenv("TZ", "UTC0", 1) != 0) 120 err(1, "setenv: cannot set TZ=UTC0"); 121 break; 122 case 'v': 123 v = vary_append(v, optarg); 124 break; 125 default: 126 usage(); 127 } 128 argc -= optind; 129 argv += optind; 130 131 /* 132 * If -d or -t, set the timezone or daylight savings time; this 133 * doesn't belong here; the kernel should not know about either. 134 */ 135 if (set_timezone && settimeofday(NULL, &tz)) 136 err(1, "settimeofday (timezone)"); 137 138 if (!rflag && time(&tval) == -1) 139 err(1, "time"); 140 141 format = "%+"; 142 143 if (Rflag) 144 format = rfc2822_format; 145 146 /* allow the operands in any order */ 147 if (*argv && **argv == '+') { 148 format = *argv + 1; 149 ++argv; 150 } 151 152 if (*argv) { 153 setthetime(fmt, *argv, jflag, nflag); 154 ++argv; 155 } else if (fmt != NULL) 156 usage(); 157 158 if (*argv && **argv == '+') 159 format = *argv + 1; 160 161 lt = *localtime(&tval); 162 badv = vary_apply(v, <); 163 if (badv) { 164 fprintf(stderr, "%s: Cannot apply date adjustment\n", 165 badv->arg); 166 vary_destroy(v); 167 usage(); 168 } 169 vary_destroy(v); 170 171 if (format == rfc2822_format) { 172 /* 173 * When using RFC 2822 datetime format, don't honor the 174 * locale. 175 */ 176 setlocale(LC_TIME, "C"); 177 } 178 179 strftime(buf, sizeof(buf), format, <); 180 printf("%s\n", buf); 181 if (fflush(stdout) != 0) 182 err(1, "stdout"); 183 exit(retval); 184 } 185 186 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 187 188 static void 189 setthetime(const char *fmt, const char *p, int jflag, int nflag) 190 { 191 struct tm *lt; 192 struct timeval tv; 193 const char *dot, *t; 194 int century; 195 196 if (fmt != NULL) { 197 lt = localtime(&tval); 198 t = strptime(p, fmt, lt); 199 if (t == NULL) { 200 fprintf(stderr, "Failed conversion of ``%s''" 201 " using format ``%s''\n", p, fmt); 202 badformat(); 203 } else if (*t != '\0') 204 fprintf(stderr, "Warning: Ignoring %ld extraneous" 205 " characters in date string (%s)\n", 206 (long) strlen(t), t); 207 } else { 208 for (t = p, dot = NULL; *t; ++t) { 209 if (isdigit(*t)) 210 continue; 211 if (*t == '.' && dot == NULL) { 212 dot = t; 213 continue; 214 } 215 badformat(); 216 } 217 218 lt = localtime(&tval); 219 220 if (dot != NULL) { /* .ss */ 221 dot++; /* *dot++ = '\0'; */ 222 if (strlen(dot) != 2) 223 badformat(); 224 lt->tm_sec = ATOI2(dot); 225 if (lt->tm_sec > 61) 226 badformat(); 227 } else 228 lt->tm_sec = 0; 229 230 century = 0; 231 /* if p has a ".ss" field then let's pretend it's not there */ 232 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 233 case 12: /* cc */ 234 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 235 century = 1; 236 /* FALLTHROUGH */ 237 case 10: /* yy */ 238 if (century) 239 lt->tm_year += ATOI2(p); 240 else { /* hack for 2000 ;-} */ 241 lt->tm_year = ATOI2(p); 242 if (lt->tm_year < 69) 243 lt->tm_year += 2000 - TM_YEAR_BASE; 244 else 245 lt->tm_year += 1900 - TM_YEAR_BASE; 246 } 247 /* FALLTHROUGH */ 248 case 8: /* mm */ 249 lt->tm_mon = ATOI2(p); 250 if (lt->tm_mon > 12) 251 badformat(); 252 --lt->tm_mon; /* time struct is 0 - 11 */ 253 /* FALLTHROUGH */ 254 case 6: /* dd */ 255 lt->tm_mday = ATOI2(p); 256 if (lt->tm_mday > 31) 257 badformat(); 258 /* FALLTHROUGH */ 259 case 4: /* HH */ 260 lt->tm_hour = ATOI2(p); 261 if (lt->tm_hour > 23) 262 badformat(); 263 /* FALLTHROUGH */ 264 case 2: /* MM */ 265 lt->tm_min = ATOI2(p); 266 if (lt->tm_min > 59) 267 badformat(); 268 break; 269 default: 270 badformat(); 271 } 272 } 273 274 /* Let mktime() decide whether summer time is in effect. */ 275 lt->tm_isdst = -1; 276 277 /* convert broken-down time to GMT clock time */ 278 if ((tval = mktime(lt)) == -1) 279 errx(1, "nonexistent time"); 280 281 if (!jflag) { 282 /* set the time */ 283 if (nflag || netsettime(tval)) { 284 logwtmp("|", "date", ""); 285 tv.tv_sec = tval; 286 tv.tv_usec = 0; 287 if (settimeofday(&tv, NULL)) 288 err(1, "settimeofday (timeval)"); 289 logwtmp("{", "date", ""); 290 } 291 292 if ((p = getlogin()) == NULL) 293 p = "???"; 294 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 295 } 296 } 297 298 static void 299 badformat(void) 300 { 301 warnx("illegal time format"); 302 usage(); 303 } 304 305 static void 306 usage(void) 307 { 308 fprintf(stderr, "%s\n%s\n", 309 "usage: date [-jnRu] [-d dst] [-r seconds] [-t west] " 310 "[-v[+|-]val[ymwdHMS]] ... ", 311 " " 312 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 313 exit(1); 314 } 315