1 /* 2 * Copyright (c) 1987, 1993, 1994 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 const char copyright[] = 32 "@(#) Copyright (c) 1987, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 38 #endif /* not lint */ 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/stat.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fcntl.h> 48 #include <langinfo.h> 49 #include <locale.h> 50 #include <paths.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <time.h> 56 #include <timeconv.h> 57 #include <unistd.h> 58 #include <utmpx.h> 59 #include <sys/queue.h> 60 61 #define NO 0 /* false/no */ 62 #define YES 1 /* true/yes */ 63 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 64 65 typedef struct arg { 66 char *name; /* argument */ 67 #define HOST_TYPE -2 68 #define TTY_TYPE -3 69 #define USER_TYPE -4 70 int type; /* type of arg */ 71 struct arg *next; /* linked list pointer */ 72 } ARG; 73 static ARG *arglist; /* head of linked list */ 74 75 static SLIST_HEAD(, idtab) idlist; 76 77 struct idtab { 78 time_t logout; /* log out time */ 79 char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */ 80 SLIST_ENTRY(idtab) list; 81 }; 82 83 static const char *crmsg; /* cause of last reboot */ 84 static time_t currentout; /* current logout value */ 85 static long maxrec; /* records to display */ 86 static const char *file = NULL; /* utx.log file */ 87 static int sflag = 0; /* show delta in seconds */ 88 static int width = 5; /* show seconds in delta */ 89 static int yflag; /* show year */ 90 static int d_first; 91 static int snapfound = 0; /* found snapshot entry? */ 92 static time_t snaptime; /* if != 0, we will only 93 * report users logged in 94 * at this snapshot time 95 */ 96 97 static void addarg(int, char *); 98 static time_t dateconv(char *); 99 static void doentry(struct utmpx *); 100 static void hostconv(char *); 101 static void printentry(struct utmpx *, struct idtab *); 102 static char *ttyconv(char *); 103 static int want(struct utmpx *); 104 static void usage(void); 105 static void wtmp(void); 106 107 static void 108 usage(void) 109 { 110 (void)fprintf(stderr, 111 "usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n" 112 " [-n maxrec] [-t tty] [user ...]\n"); 113 exit(1); 114 } 115 116 int 117 main(int argc, char *argv[]) 118 { 119 int ch; 120 char *p; 121 122 (void) setlocale(LC_TIME, ""); 123 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 124 125 maxrec = -1; 126 snaptime = 0; 127 while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -1) 128 switch (ch) { 129 case '0': case '1': case '2': case '3': case '4': 130 case '5': case '6': case '7': case '8': case '9': 131 /* 132 * kludge: last was originally designed to take 133 * a number after a dash. 134 */ 135 if (maxrec == -1) { 136 p = strchr(argv[optind - 1], ch); 137 if (p == NULL) 138 p = strchr(argv[optind], ch); 139 maxrec = atol(p); 140 if (!maxrec) 141 exit(0); 142 } 143 break; 144 case 'd': 145 snaptime = dateconv(optarg); 146 break; 147 case 'f': 148 file = optarg; 149 break; 150 case 'h': 151 hostconv(optarg); 152 addarg(HOST_TYPE, optarg); 153 break; 154 case 'n': 155 errno = 0; 156 maxrec = strtol(optarg, &p, 10); 157 if (p == optarg || *p != '\0' || errno != 0 || 158 maxrec <= 0) 159 errx(1, "%s: bad line count", optarg); 160 break; 161 case 's': 162 sflag++; /* Show delta as seconds */ 163 break; 164 case 't': 165 addarg(TTY_TYPE, ttyconv(optarg)); 166 break; 167 case 'w': 168 width = 8; 169 break; 170 case 'y': 171 yflag++; 172 break; 173 case '?': 174 default: 175 usage(); 176 } 177 178 if (sflag && width == 8) usage(); 179 180 if (argc) { 181 setlinebuf(stdout); 182 for (argv += optind; *argv; ++argv) { 183 #define COMPATIBILITY 184 #ifdef COMPATIBILITY 185 /* code to allow "last p5" to work */ 186 addarg(TTY_TYPE, ttyconv(*argv)); 187 #endif 188 addarg(USER_TYPE, *argv); 189 } 190 } 191 wtmp(); 192 exit(0); 193 } 194 195 /* 196 * wtmp -- 197 * read through the utx.log file 198 */ 199 static void 200 wtmp(void) 201 { 202 struct utmpx *buf = NULL; 203 struct utmpx *ut; 204 static unsigned int amount = 0; 205 time_t t; 206 char ct[80]; 207 struct tm *tm; 208 209 SLIST_INIT(&idlist); 210 (void)time(&t); 211 212 /* Load the last entries from the file. */ 213 if (setutxdb(UTXDB_LOG, file) != 0) 214 err(1, "%s", file); 215 while ((ut = getutxent()) != NULL) { 216 if (amount % 128 == 0) { 217 buf = realloc(buf, (amount + 128) * sizeof *ut); 218 if (buf == NULL) 219 err(1, "realloc"); 220 } 221 memcpy(&buf[amount++], ut, sizeof *ut); 222 if (t > ut->ut_tv.tv_sec) 223 t = ut->ut_tv.tv_sec; 224 } 225 endutxent(); 226 227 /* Display them in reverse order. */ 228 while (amount > 0) 229 doentry(&buf[--amount]); 230 231 tm = localtime(&t); 232 (void) strftime(ct, sizeof(ct), "%+", tm); 233 printf("\n%s begins %s\n", ((file == NULL) ? "utx.log" : file), ct); 234 } 235 236 /* 237 * doentry -- 238 * process a single utx.log entry 239 */ 240 static void 241 doentry(struct utmpx *bp) 242 { 243 struct idtab *tt; 244 245 /* the machine stopped */ 246 if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) { 247 /* everybody just logged out */ 248 while ((tt = SLIST_FIRST(&idlist)) != NULL) { 249 SLIST_REMOVE_HEAD(&idlist, list); 250 free(tt); 251 } 252 currentout = -bp->ut_tv.tv_sec; 253 crmsg = bp->ut_type != SHUTDOWN_TIME ? 254 "crash" : "shutdown"; 255 /* 256 * if we're in snapshot mode, we want to exit if this 257 * shutdown/reboot appears while we we are tracking the 258 * active range 259 */ 260 if (snaptime && snapfound) 261 exit(0); 262 /* 263 * don't print shutdown/reboot entries unless flagged for 264 */ 265 if (!snaptime && want(bp)) 266 printentry(bp, NULL); 267 return; 268 } 269 /* date got set */ 270 if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) { 271 if (want(bp) && !snaptime) 272 printentry(bp, NULL); 273 return; 274 } 275 276 if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS) 277 return; 278 279 /* find associated identifier */ 280 SLIST_FOREACH(tt, &idlist, list) 281 if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id)) 282 break; 283 284 if (tt == NULL) { 285 /* add new one */ 286 tt = malloc(sizeof(struct idtab)); 287 if (tt == NULL) 288 errx(1, "malloc failure"); 289 tt->logout = currentout; 290 memcpy(tt->id, bp->ut_id, sizeof bp->ut_id); 291 SLIST_INSERT_HEAD(&idlist, tt, list); 292 } 293 294 /* 295 * print record if not in snapshot mode and wanted 296 * or in snapshot mode and in snapshot range 297 */ 298 if (bp->ut_type == USER_PROCESS && (want(bp) || 299 (bp->ut_tv.tv_sec < snaptime && 300 (tt->logout > snaptime || tt->logout < 1)))) { 301 snapfound = 1; 302 printentry(bp, tt); 303 } 304 tt->logout = bp->ut_tv.tv_sec; 305 } 306 307 /* 308 * printentry -- 309 * output an entry 310 * 311 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or 312 * logout type (crash/shutdown) as appropriate. 313 */ 314 static void 315 printentry(struct utmpx *bp, struct idtab *tt) 316 { 317 char ct[80]; 318 struct tm *tm; 319 time_t delta; /* time difference */ 320 time_t t; 321 322 if (maxrec != -1 && !maxrec--) 323 exit(0); 324 t = bp->ut_tv.tv_sec; 325 tm = localtime(&t); 326 (void) strftime(ct, sizeof(ct), d_first ? 327 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") : 328 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm); 329 switch (bp->ut_type) { 330 case BOOT_TIME: 331 printf("%-42s", "boot time"); 332 break; 333 case SHUTDOWN_TIME: 334 printf("%-42s", "shutdown time"); 335 break; 336 case OLD_TIME: 337 printf("%-42s", "old time"); 338 break; 339 case NEW_TIME: 340 printf("%-42s", "new time"); 341 break; 342 case USER_PROCESS: 343 printf("%-10s %-8s %-22.22s", 344 bp->ut_user, bp->ut_line, bp->ut_host); 345 break; 346 } 347 printf(" %s%c", ct, tt == NULL ? '\n' : ' '); 348 if (tt == NULL) 349 return; 350 if (!tt->logout) { 351 puts(" still logged in"); 352 return; 353 } 354 if (tt->logout < 0) { 355 tt->logout = -tt->logout; 356 printf("- %s", crmsg); 357 } else { 358 tm = localtime(&tt->logout); 359 (void) strftime(ct, sizeof(ct), "%R", tm); 360 printf("- %s", ct); 361 } 362 delta = tt->logout - bp->ut_tv.tv_sec; 363 if (sflag) { 364 printf(" (%8ld)\n", (long)delta); 365 } else { 366 tm = gmtime(&delta); 367 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm); 368 if (delta < 86400) 369 printf(" (%s)\n", ct); 370 else 371 printf(" (%ld+%s)\n", (long)delta / 86400, ct); 372 } 373 } 374 375 /* 376 * want -- 377 * see if want this entry 378 */ 379 static int 380 want(struct utmpx *bp) 381 { 382 ARG *step; 383 384 if (snaptime) 385 return (NO); 386 387 if (!arglist) 388 return (YES); 389 390 for (step = arglist; step; step = step->next) 391 switch(step->type) { 392 case HOST_TYPE: 393 if (!strcasecmp(step->name, bp->ut_host)) 394 return (YES); 395 break; 396 case TTY_TYPE: 397 if (!strcmp(step->name, bp->ut_line)) 398 return (YES); 399 break; 400 case USER_TYPE: 401 if (!strcmp(step->name, bp->ut_user)) 402 return (YES); 403 break; 404 } 405 return (NO); 406 } 407 408 /* 409 * addarg -- 410 * add an entry to a linked list of arguments 411 */ 412 static void 413 addarg(int type, char *arg) 414 { 415 ARG *cur; 416 417 if ((cur = malloc(sizeof(ARG))) == NULL) 418 errx(1, "malloc failure"); 419 cur->next = arglist; 420 cur->type = type; 421 cur->name = arg; 422 arglist = cur; 423 } 424 425 /* 426 * hostconv -- 427 * convert the hostname to search pattern; if the supplied host name 428 * has a domain attached that is the same as the current domain, rip 429 * off the domain suffix since that's what login(1) does. 430 */ 431 static void 432 hostconv(char *arg) 433 { 434 static int first = 1; 435 static char *hostdot, name[MAXHOSTNAMELEN]; 436 char *argdot; 437 438 if (!(argdot = strchr(arg, '.'))) 439 return; 440 if (first) { 441 first = 0; 442 if (gethostname(name, sizeof(name))) 443 err(1, "gethostname"); 444 hostdot = strchr(name, '.'); 445 } 446 if (hostdot && !strcasecmp(hostdot, argdot)) 447 *argdot = '\0'; 448 } 449 450 /* 451 * ttyconv -- 452 * convert tty to correct name. 453 */ 454 static char * 455 ttyconv(char *arg) 456 { 457 char *mval; 458 459 /* 460 * kludge -- we assume that all tty's end with 461 * a two character suffix. 462 */ 463 if (strlen(arg) == 2) { 464 /* either 6 for "ttyxx" or 8 for "console" */ 465 if ((mval = malloc(8)) == NULL) 466 errx(1, "malloc failure"); 467 if (!strcmp(arg, "co")) 468 (void)strcpy(mval, "console"); 469 else { 470 (void)strcpy(mval, "tty"); 471 (void)strcpy(mval + 3, arg); 472 } 473 return (mval); 474 } 475 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 476 return (arg + 5); 477 return (arg); 478 } 479 480 /* 481 * dateconv -- 482 * Convert the snapshot time in command line given in the format 483 * [[CC]YY]MMDDhhmm[.SS]] to a time_t. 484 * Derived from atime_arg1() in usr.bin/touch/touch.c 485 */ 486 static time_t 487 dateconv(char *arg) 488 { 489 time_t timet; 490 struct tm *t; 491 int yearset; 492 char *p; 493 494 /* Start with the current time. */ 495 if (time(&timet) < 0) 496 err(1, "time"); 497 if ((t = localtime(&timet)) == NULL) 498 err(1, "localtime"); 499 500 /* [[CC]YY]MMDDhhmm[.SS] */ 501 if ((p = strchr(arg, '.')) == NULL) 502 t->tm_sec = 0; /* Seconds defaults to 0. */ 503 else { 504 if (strlen(p + 1) != 2) 505 goto terr; 506 *p++ = '\0'; 507 t->tm_sec = ATOI2(p); 508 } 509 510 yearset = 0; 511 switch (strlen(arg)) { 512 case 12: /* CCYYMMDDhhmm */ 513 t->tm_year = ATOI2(arg); 514 t->tm_year *= 100; 515 yearset = 1; 516 /* FALLTHROUGH */ 517 case 10: /* YYMMDDhhmm */ 518 if (yearset) { 519 yearset = ATOI2(arg); 520 t->tm_year += yearset; 521 } else { 522 yearset = ATOI2(arg); 523 if (yearset < 69) 524 t->tm_year = yearset + 2000; 525 else 526 t->tm_year = yearset + 1900; 527 } 528 t->tm_year -= 1900; /* Convert to UNIX time. */ 529 /* FALLTHROUGH */ 530 case 8: /* MMDDhhmm */ 531 t->tm_mon = ATOI2(arg); 532 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 533 t->tm_mday = ATOI2(arg); 534 t->tm_hour = ATOI2(arg); 535 t->tm_min = ATOI2(arg); 536 break; 537 case 4: /* hhmm */ 538 t->tm_hour = ATOI2(arg); 539 t->tm_min = ATOI2(arg); 540 break; 541 default: 542 goto terr; 543 } 544 t->tm_isdst = -1; /* Figure out DST. */ 545 timet = mktime(t); 546 if (timet == -1) 547 terr: errx(1, 548 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 549 return timet; 550 } 551