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 #include <utmpx.h> 47 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 56 static void setthetime(const char *, const char *, int); 57 static void badformat(void); 58 static void usage(void); 59 60 static const char *rfc2822_format ="%a, %d %b %Y %T %z"; 61 62 int 63 main(int argc, char **argv) 64 { 65 int ch, rflag; 66 int jflag, Rflag; 67 const char *format; 68 char buf[1024]; 69 char *fmt; 70 char *tmp; 71 struct vary *v; 72 const struct vary *badv; 73 struct tm lt; 74 75 v = NULL; 76 fmt = NULL; 77 setlocale(LC_TIME, ""); 78 rflag = 0; 79 jflag = Rflag = 0; 80 while ((ch = getopt(argc, argv, "f:jnRr:uv:")) != -1) 81 switch(ch) { 82 case 'f': 83 fmt = optarg; 84 break; 85 case 'j': 86 jflag = 1; /* don't set time */ 87 break; 88 case 'n': /* don't set network */ 89 break; 90 case 'R': 91 Rflag = 1; /*RFC 2822 datetime format */ 92 break; 93 case 'r': /* user specified seconds */ 94 rflag = 1; 95 tval = strtoll(optarg, &tmp, 0); 96 if (*tmp != 0) 97 usage(); 98 break; 99 case 'u': /* do everything in UTC */ 100 if (setenv("TZ", "UTC0", 1) != 0) 101 err(1, "setenv: cannot set TZ=UTC0"); 102 break; 103 case 'v': 104 v = vary_append(v, optarg); 105 break; 106 default: 107 usage(); 108 } 109 argc -= optind; 110 argv += optind; 111 112 if (!rflag && time(&tval) == -1) 113 err(1, "time"); 114 115 format = "%+"; 116 117 if (Rflag) 118 format = rfc2822_format; 119 120 /* allow the operands in any order */ 121 if (*argv && **argv == '+') { 122 format = *argv + 1; 123 ++argv; 124 } 125 126 if (*argv) { 127 setthetime(fmt, *argv, jflag); 128 ++argv; 129 } else if (fmt != NULL) 130 usage(); 131 132 if (*argv && **argv == '+') 133 format = *argv + 1; 134 135 lt = *localtime(&tval); 136 badv = vary_apply(v, <); 137 if (badv) { 138 fprintf(stderr, "%s: Cannot apply date adjustment\n", 139 badv->arg); 140 vary_destroy(v); 141 usage(); 142 } 143 vary_destroy(v); 144 145 if (format == rfc2822_format) { 146 /* 147 * When using RFC 2822 datetime format, don't honor the 148 * locale. 149 */ 150 setlocale(LC_TIME, "C"); 151 } 152 153 strftime(buf, sizeof(buf), format, <); 154 printf("%s\n", buf); 155 if (fflush(stdout) != 0) 156 err(1, "stdout"); 157 exit(EXIT_SUCCESS); 158 } 159 160 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 161 162 static void 163 setthetime(const char *fmt, const char *p, int jflag) 164 { 165 struct tm *lt; 166 struct timeval tv; 167 const char *dot, *t; 168 int century; 169 170 if (fmt != NULL) { 171 lt = localtime(&tval); 172 t = strptime(p, fmt, lt); 173 if (t == NULL) { 174 fprintf(stderr, "Failed conversion of ``%s''" 175 " using format ``%s''\n", p, fmt); 176 badformat(); 177 } else if (*t != '\0') 178 fprintf(stderr, "Warning: Ignoring %ld extraneous" 179 " characters in date string (%s)\n", 180 (long) strlen(t), t); 181 } else { 182 for (t = p, dot = NULL; *t; ++t) { 183 if (isdigit(*t)) 184 continue; 185 if (*t == '.' && dot == NULL) { 186 dot = t; 187 continue; 188 } 189 badformat(); 190 } 191 192 lt = localtime(&tval); 193 194 if (dot != NULL) { /* .ss */ 195 dot++; /* *dot++ = '\0'; */ 196 if (strlen(dot) != 2) 197 badformat(); 198 lt->tm_sec = ATOI2(dot); 199 if (lt->tm_sec > 61) 200 badformat(); 201 } else 202 lt->tm_sec = 0; 203 204 century = 0; 205 /* if p has a ".ss" field then let's pretend it's not there */ 206 switch (strlen(p) - ((dot != NULL) ? 3 : 0)) { 207 case 12: /* cc */ 208 lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; 209 century = 1; 210 /* FALLTHROUGH */ 211 case 10: /* yy */ 212 if (century) 213 lt->tm_year += ATOI2(p); 214 else { /* hack for 2000 ;-} */ 215 lt->tm_year = ATOI2(p); 216 if (lt->tm_year < 69) 217 lt->tm_year += 2000 - TM_YEAR_BASE; 218 else 219 lt->tm_year += 1900 - TM_YEAR_BASE; 220 } 221 /* FALLTHROUGH */ 222 case 8: /* mm */ 223 lt->tm_mon = ATOI2(p); 224 if (lt->tm_mon > 12) 225 badformat(); 226 --lt->tm_mon; /* time struct is 0 - 11 */ 227 /* FALLTHROUGH */ 228 case 6: /* dd */ 229 lt->tm_mday = ATOI2(p); 230 if (lt->tm_mday > 31) 231 badformat(); 232 /* FALLTHROUGH */ 233 case 4: /* HH */ 234 lt->tm_hour = ATOI2(p); 235 if (lt->tm_hour > 23) 236 badformat(); 237 /* FALLTHROUGH */ 238 case 2: /* MM */ 239 lt->tm_min = ATOI2(p); 240 if (lt->tm_min > 59) 241 badformat(); 242 break; 243 default: 244 badformat(); 245 } 246 } 247 248 /* Let mktime() decide whether summer time is in effect. */ 249 lt->tm_isdst = -1; 250 251 /* convert broken-down time to GMT clock time */ 252 if ((tval = mktime(lt)) == -1) 253 errx(1, "nonexistent time"); 254 255 if (!jflag) { 256 logwtmpx("|", "date", "", 0, OLD_TIME); 257 tv.tv_sec = tval; 258 tv.tv_usec = 0; 259 if (settimeofday(&tv, NULL)) 260 err(1, "settimeofday (timeval)"); 261 logwtmpx("{", "date", "", 0, NEW_TIME); 262 263 if ((p = getlogin()) == NULL) 264 p = "???"; 265 syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); 266 } 267 } 268 269 static void 270 badformat(void) 271 { 272 warnx("illegal time format"); 273 usage(); 274 } 275 276 static void 277 usage(void) 278 { 279 fprintf(stderr, "%s\n%s\n", 280 "usage: date [-jnRu] [-r seconds] [-v[+|-]val[ymwdHMS]] ... ", 281 " " 282 "[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"); 283 exit(1); 284 } 285