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 LIST_HEAD(idlisthead, idtab) idlist; 76 77 struct idtab { 78 time_t logout; /* log out time */ 79 char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */ 80 LIST_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; /* wtmp 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 wtmp 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 LIST_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), "\nwtmp begins %+\n", tm); 233 printf("%s", ct); 234 } 235 236 /* 237 * doentry -- 238 * process a single wtmp entry 239 */ 240 static void 241 doentry(struct utmpx *bp) 242 { 243 struct idtab *tt, *ttx; /* idlist entry */ 244 245 /* the machine stopped */ 246 if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) { 247 /* everybody just logged out */ 248 for (tt = LIST_FIRST(&idlist); tt;) { 249 LIST_REMOVE(tt, list); 250 ttx = tt; 251 tt = LIST_NEXT(tt, list); 252 free(ttx); 253 } 254 currentout = -bp->ut_tv.tv_sec; 255 crmsg = bp->ut_type != SHUTDOWN_TIME ? 256 "crash" : "shutdown"; 257 /* 258 * if we're in snapshot mode, we want to exit if this 259 * shutdown/reboot appears while we we are tracking the 260 * active range 261 */ 262 if (snaptime && snapfound) 263 exit(0); 264 /* 265 * don't print shutdown/reboot entries unless flagged for 266 */ 267 if (!snaptime && want(bp)) 268 printentry(bp, NULL); 269 return; 270 } 271 /* date got set */ 272 if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) { 273 if (want(bp) && !snaptime) 274 printentry(bp, NULL); 275 return; 276 } 277 278 if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS) 279 return; 280 281 /* find associated identifier */ 282 LIST_FOREACH(tt, &idlist, list) 283 if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id)) 284 break; 285 286 if (tt == NULL) { 287 /* add new one */ 288 tt = malloc(sizeof(struct idtab)); 289 if (tt == NULL) 290 errx(1, "malloc failure"); 291 tt->logout = currentout; 292 memcpy(tt->id, bp->ut_id, sizeof bp->ut_id); 293 LIST_INSERT_HEAD(&idlist, tt, list); 294 } 295 296 /* 297 * print record if not in snapshot mode and wanted 298 * or in snapshot mode and in snapshot range 299 */ 300 if (bp->ut_type == USER_PROCESS && (want(bp) || 301 (bp->ut_tv.tv_sec < snaptime && 302 (tt->logout > snaptime || tt->logout < 1)))) { 303 snapfound = 1; 304 printentry(bp, tt); 305 } 306 tt->logout = bp->ut_tv.tv_sec; 307 } 308 309 /* 310 * printentry -- 311 * output an entry 312 * 313 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or 314 * logout type (crash/shutdown) as appropriate. 315 */ 316 static void 317 printentry(struct utmpx *bp, struct idtab *tt) 318 { 319 char ct[80]; 320 struct tm *tm; 321 time_t delta; /* time difference */ 322 time_t t; 323 324 if (maxrec != -1 && !maxrec--) 325 exit(0); 326 t = bp->ut_tv.tv_sec; 327 tm = localtime(&t); 328 (void) strftime(ct, sizeof(ct), d_first ? 329 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") : 330 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm); 331 switch (bp->ut_type) { 332 case BOOT_TIME: 333 printf("%-42s", "boot time"); 334 break; 335 case SHUTDOWN_TIME: 336 printf("%-42s", "shutdown time"); 337 break; 338 case OLD_TIME: 339 printf("%-42s", "old time"); 340 break; 341 case NEW_TIME: 342 printf("%-42s", "new time"); 343 break; 344 case USER_PROCESS: 345 printf("%-10s %-8s %-22.22s", 346 bp->ut_user, bp->ut_line, bp->ut_host); 347 break; 348 } 349 printf(" %s%c", ct, tt == NULL ? '\n' : ' '); 350 if (tt == NULL) 351 return; 352 if (!tt->logout) { 353 puts(" still logged in"); 354 return; 355 } 356 if (tt->logout < 0) { 357 tt->logout = -tt->logout; 358 printf("- %s", crmsg); 359 } else { 360 tm = localtime(&tt->logout); 361 (void) strftime(ct, sizeof(ct), "%R", tm); 362 printf("- %s", ct); 363 } 364 delta = tt->logout - bp->ut_tv.tv_sec; 365 if (sflag) { 366 printf(" (%8ld)\n", (long)delta); 367 } else { 368 tm = gmtime(&delta); 369 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm); 370 if (delta < 86400) 371 printf(" (%s)\n", ct); 372 else 373 printf(" (%ld+%s)\n", (long)delta / 86400, ct); 374 } 375 } 376 377 /* 378 * want -- 379 * see if want this entry 380 */ 381 static int 382 want(struct utmpx *bp) 383 { 384 ARG *step; 385 386 if (snaptime) 387 return (NO); 388 389 if (!arglist) 390 return (YES); 391 392 for (step = arglist; step; step = step->next) 393 switch(step->type) { 394 case HOST_TYPE: 395 if (!strcasecmp(step->name, bp->ut_host)) 396 return (YES); 397 break; 398 case TTY_TYPE: 399 if (!strcmp(step->name, bp->ut_line)) 400 return (YES); 401 break; 402 case USER_TYPE: 403 if (!strcmp(step->name, bp->ut_user)) 404 return (YES); 405 break; 406 } 407 return (NO); 408 } 409 410 /* 411 * addarg -- 412 * add an entry to a linked list of arguments 413 */ 414 static void 415 addarg(int type, char *arg) 416 { 417 ARG *cur; 418 419 if ((cur = malloc(sizeof(ARG))) == NULL) 420 errx(1, "malloc failure"); 421 cur->next = arglist; 422 cur->type = type; 423 cur->name = arg; 424 arglist = cur; 425 } 426 427 /* 428 * hostconv -- 429 * convert the hostname to search pattern; if the supplied host name 430 * has a domain attached that is the same as the current domain, rip 431 * off the domain suffix since that's what login(1) does. 432 */ 433 static void 434 hostconv(char *arg) 435 { 436 static int first = 1; 437 static char *hostdot, name[MAXHOSTNAMELEN]; 438 char *argdot; 439 440 if (!(argdot = strchr(arg, '.'))) 441 return; 442 if (first) { 443 first = 0; 444 if (gethostname(name, sizeof(name))) 445 err(1, "gethostname"); 446 hostdot = strchr(name, '.'); 447 } 448 if (hostdot && !strcasecmp(hostdot, argdot)) 449 *argdot = '\0'; 450 } 451 452 /* 453 * ttyconv -- 454 * convert tty to correct name. 455 */ 456 static char * 457 ttyconv(char *arg) 458 { 459 char *mval; 460 461 /* 462 * kludge -- we assume that all tty's end with 463 * a two character suffix. 464 */ 465 if (strlen(arg) == 2) { 466 /* either 6 for "ttyxx" or 8 for "console" */ 467 if ((mval = malloc(8)) == NULL) 468 errx(1, "malloc failure"); 469 if (!strcmp(arg, "co")) 470 (void)strcpy(mval, "console"); 471 else { 472 (void)strcpy(mval, "tty"); 473 (void)strcpy(mval + 3, arg); 474 } 475 return (mval); 476 } 477 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 478 return (arg + 5); 479 return (arg); 480 } 481 482 /* 483 * dateconv -- 484 * Convert the snapshot time in command line given in the format 485 * [[CC]YY]MMDDhhmm[.SS]] to a time_t. 486 * Derived from atime_arg1() in usr.bin/touch/touch.c 487 */ 488 static time_t 489 dateconv(char *arg) 490 { 491 time_t timet; 492 struct tm *t; 493 int yearset; 494 char *p; 495 496 /* Start with the current time. */ 497 if (time(&timet) < 0) 498 err(1, "time"); 499 if ((t = localtime(&timet)) == NULL) 500 err(1, "localtime"); 501 502 /* [[CC]YY]MMDDhhmm[.SS] */ 503 if ((p = strchr(arg, '.')) == NULL) 504 t->tm_sec = 0; /* Seconds defaults to 0. */ 505 else { 506 if (strlen(p + 1) != 2) 507 goto terr; 508 *p++ = '\0'; 509 t->tm_sec = ATOI2(p); 510 } 511 512 yearset = 0; 513 switch (strlen(arg)) { 514 case 12: /* CCYYMMDDhhmm */ 515 t->tm_year = ATOI2(arg); 516 t->tm_year *= 100; 517 yearset = 1; 518 /* FALLTHROUGH */ 519 case 10: /* YYMMDDhhmm */ 520 if (yearset) { 521 yearset = ATOI2(arg); 522 t->tm_year += yearset; 523 } else { 524 yearset = ATOI2(arg); 525 if (yearset < 69) 526 t->tm_year = yearset + 2000; 527 else 528 t->tm_year = yearset + 1900; 529 } 530 t->tm_year -= 1900; /* Convert to UNIX time. */ 531 /* FALLTHROUGH */ 532 case 8: /* MMDDhhmm */ 533 t->tm_mon = ATOI2(arg); 534 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 535 t->tm_mday = ATOI2(arg); 536 t->tm_hour = ATOI2(arg); 537 t->tm_min = ATOI2(arg); 538 break; 539 case 4: /* hhmm */ 540 t->tm_hour = ATOI2(arg); 541 t->tm_min = ATOI2(arg); 542 break; 543 default: 544 goto terr; 545 } 546 t->tm_isdst = -1; /* Figure out DST. */ 547 timet = mktime(t); 548 if (timet == -1) 549 terr: errx(1, 550 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 551 return timet; 552 } 553