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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1987, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 42 #endif /* not lint */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <langinfo.h> 53 #include <locale.h> 54 #include <paths.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <time.h> 60 #include <timeconv.h> 61 #include <unistd.h> 62 #include <utmp.h> 63 #include <sys/queue.h> 64 65 #define NO 0 /* false/no */ 66 #define YES 1 /* true/yes */ 67 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 68 69 static struct utmp buf[1024]; /* utmp read buffer */ 70 71 typedef struct arg { 72 char *name; /* argument */ 73 #define HOST_TYPE -2 74 #define TTY_TYPE -3 75 #define USER_TYPE -4 76 int type; /* type of arg */ 77 struct arg *next; /* linked list pointer */ 78 } ARG; 79 ARG *arglist; /* head of linked list */ 80 81 LIST_HEAD(ttylisthead, ttytab) ttylist; 82 83 struct ttytab { 84 time_t logout; /* log out time */ 85 char tty[UT_LINESIZE + 1]; /* terminal name */ 86 LIST_ENTRY(ttytab) list; 87 }; 88 89 static const char *crmsg; /* cause of last reboot */ 90 static long currentout, /* current logout value */ 91 maxrec; /* records to display */ 92 static const char *file = _PATH_WTMP; /* wtmp file */ 93 static int sflag = 0; /* show delta in seconds */ 94 static int width = 5; /* show seconds in delta */ 95 static int yflag; /* show year */ 96 static int d_first; 97 static int snapfound = 0; /* found snapshot entry? */ 98 static time_t snaptime; /* if != 0, we will only 99 * report users logged in 100 * at this snapshot time 101 */ 102 103 void addarg(int, char *); 104 time_t dateconv(char *); 105 void doentry(struct utmp *); 106 void hostconv(char *); 107 void onintr(int); 108 void printentry(struct utmp *, struct ttytab *); 109 char *ttyconv(char *); 110 int want(struct utmp *); 111 void usage(void); 112 void wtmp(void); 113 114 void 115 usage(void) 116 { 117 (void)fprintf(stderr, 118 "usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n" 119 " [-n maxrec] [-t tty] [user ...]\n"); 120 exit(1); 121 } 122 123 int 124 main(int argc, char *argv[]) 125 { 126 int ch; 127 char *p; 128 129 (void) setlocale(LC_TIME, ""); 130 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 131 132 maxrec = -1; 133 snaptime = 0; 134 while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -1) 135 switch (ch) { 136 case '0': case '1': case '2': case '3': case '4': 137 case '5': case '6': case '7': case '8': case '9': 138 /* 139 * kludge: last was originally designed to take 140 * a number after a dash. 141 */ 142 if (maxrec == -1) { 143 p = strchr(argv[optind - 1], ch); 144 if (p == NULL) 145 p = strchr(argv[optind], ch); 146 maxrec = atol(p); 147 if (!maxrec) 148 exit(0); 149 } 150 break; 151 case 'd': 152 snaptime = dateconv(optarg); 153 break; 154 case 'f': 155 file = optarg; 156 break; 157 case 'h': 158 hostconv(optarg); 159 addarg(HOST_TYPE, optarg); 160 break; 161 case 'n': 162 errno = 0; 163 maxrec = strtol(optarg, &p, 10); 164 if (p == optarg || *p != '\0' || errno != 0 || 165 maxrec <= 0) 166 errx(1, "%s: bad line count", optarg); 167 break; 168 case 's': 169 sflag++; /* Show delta as seconds */ 170 break; 171 case 't': 172 addarg(TTY_TYPE, ttyconv(optarg)); 173 break; 174 case 'w': 175 width = 8; 176 break; 177 case 'y': 178 yflag++; 179 break; 180 case '?': 181 default: 182 usage(); 183 } 184 185 if (sflag && width == 8) usage(); 186 187 if (argc) { 188 setlinebuf(stdout); 189 for (argv += optind; *argv; ++argv) { 190 #define COMPATIBILITY 191 #ifdef COMPATIBILITY 192 /* code to allow "last p5" to work */ 193 addarg(TTY_TYPE, ttyconv(*argv)); 194 #endif 195 addarg(USER_TYPE, *argv); 196 } 197 } 198 wtmp(); 199 exit(0); 200 } 201 202 /* 203 * wtmp -- 204 * read through the wtmp file 205 */ 206 void 207 wtmp(void) 208 { 209 struct utmp *bp; /* current structure */ 210 struct stat stb; /* stat of file for size */ 211 long bl; 212 int bytes, wfd; 213 char ct[80]; 214 struct tm *tm; 215 time_t t; 216 217 LIST_INIT(&ttylist); 218 219 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 220 err(1, "%s", file); 221 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 222 223 (void)time(&t); 224 buf[0].ut_time = _time_to_int(t); 225 (void)signal(SIGINT, onintr); 226 (void)signal(SIGQUIT, onintr); 227 228 while (--bl >= 0) { 229 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 230 (bytes = read(wfd, buf, sizeof(buf))) == -1) 231 err(1, "%s", file); 232 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) 233 doentry(bp); 234 } 235 t = _int_to_time(buf[0].ut_time); 236 tm = localtime(&t); 237 (void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm); 238 printf("%s", ct); 239 } 240 241 /* 242 * doentry -- 243 * process a single wtmp entry 244 */ 245 void 246 doentry(struct utmp *bp) 247 { 248 struct ttytab *tt, *ttx; /* ttylist entry */ 249 250 /* 251 * if the terminal line is '~', the machine stopped. 252 * see utmp(5) for more info. 253 */ 254 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 255 /* everybody just logged out */ 256 for (tt = LIST_FIRST(&ttylist); tt;) { 257 LIST_REMOVE(tt, list); 258 ttx = tt; 259 tt = LIST_NEXT(tt, list); 260 free(ttx); 261 } 262 currentout = -bp->ut_time; 263 crmsg = strncmp(bp->ut_name, "shutdown", UT_NAMESIZE) ? 264 "crash" : "shutdown"; 265 /* 266 * if we're in snapshot mode, we want to exit if this 267 * shutdown/reboot appears while we we are tracking the 268 * active range 269 */ 270 if (snaptime && snapfound) 271 exit(0); 272 /* 273 * don't print shutdown/reboot entries unless flagged for 274 */ 275 if (!snaptime && want(bp)) 276 printentry(bp, NULL); 277 return; 278 } 279 /* 280 * if the line is '{' or '|', date got set; see 281 * utmp(5) for more info. 282 */ 283 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') && 284 !bp->ut_line[1]) { 285 if (want(bp) && !snaptime) 286 printentry(bp, NULL); 287 return; 288 } 289 /* find associated tty */ 290 LIST_FOREACH(tt, &ttylist, list) 291 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 292 break; 293 294 if (tt == NULL) { 295 /* add new one */ 296 tt = malloc(sizeof(struct ttytab)); 297 if (tt == NULL) 298 errx(1, "malloc failure"); 299 tt->logout = currentout; 300 strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 301 LIST_INSERT_HEAD(&ttylist, tt, list); 302 } 303 304 /* 305 * print record if not in snapshot mode and wanted 306 * or in snapshot mode and in snapshot range 307 */ 308 if (bp->ut_name[0] && (want(bp) || (bp->ut_time < snaptime && 309 (tt->logout > snaptime || tt->logout < 1)))) { 310 snapfound = 1; 311 /* 312 * when uucp and ftp log in over a network, the entry in 313 * the utmp file is the name plus their process id. See 314 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 315 */ 316 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 317 bp->ut_line[3] = '\0'; 318 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 319 bp->ut_line[4] = '\0'; 320 printentry(bp, tt); 321 } 322 tt->logout = bp->ut_time; 323 } 324 325 /* 326 * printentry -- 327 * output an entry 328 * 329 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or 330 * logout type (crash/shutdown) as appropriate. 331 */ 332 void 333 printentry(struct utmp *bp, struct ttytab *tt) 334 { 335 char ct[80]; 336 struct tm *tm; 337 time_t delta; /* time difference */ 338 time_t t; 339 340 if (maxrec != -1 && !maxrec--) 341 exit(0); 342 t = _int_to_time(bp->ut_time); 343 tm = localtime(&t); 344 (void) strftime(ct, sizeof(ct), d_first ? 345 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") : 346 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm); 347 printf("%-*.*s %-*.*s %-*.*s %s%c", 348 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 349 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 350 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 351 ct, tt == NULL ? '\n' : ' '); 352 if (tt == NULL) 353 return; 354 if (!tt->logout) { 355 puts(" still logged in"); 356 return; 357 } 358 if (tt->logout < 0) { 359 tt->logout = -tt->logout; 360 printf("- %s", crmsg); 361 } else { 362 tm = localtime(&tt->logout); 363 (void) strftime(ct, sizeof(ct), "%R", tm); 364 printf("- %s", ct); 365 } 366 delta = tt->logout - bp->ut_time; 367 if (sflag) { 368 printf(" (%8ld)\n", (long)delta); 369 } else { 370 tm = gmtime(&delta); 371 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm); 372 if (delta < 86400) 373 printf(" (%s)\n", ct); 374 else 375 printf(" (%ld+%s)\n", (long)delta / 86400, ct); 376 } 377 } 378 379 /* 380 * want -- 381 * see if want this entry 382 */ 383 int 384 want(struct utmp *bp) 385 { 386 ARG *step; 387 388 if (snaptime) 389 return (NO); 390 391 if (!arglist) 392 return (YES); 393 394 for (step = arglist; step; step = step->next) 395 switch(step->type) { 396 case HOST_TYPE: 397 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 398 return (YES); 399 break; 400 case TTY_TYPE: 401 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 402 return (YES); 403 break; 404 case USER_TYPE: 405 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 406 return (YES); 407 break; 408 } 409 return (NO); 410 } 411 412 /* 413 * addarg -- 414 * add an entry to a linked list of arguments 415 */ 416 void 417 addarg(int type, char *arg) 418 { 419 ARG *cur; 420 421 if ((cur = malloc(sizeof(ARG))) == NULL) 422 errx(1, "malloc failure"); 423 cur->next = arglist; 424 cur->type = type; 425 cur->name = arg; 426 arglist = cur; 427 } 428 429 /* 430 * hostconv -- 431 * convert the hostname to search pattern; if the supplied host name 432 * has a domain attached that is the same as the current domain, rip 433 * off the domain suffix since that's what login(1) does. 434 */ 435 void 436 hostconv(char *arg) 437 { 438 static int first = 1; 439 static char *hostdot, name[MAXHOSTNAMELEN]; 440 char *argdot; 441 442 if (!(argdot = strchr(arg, '.'))) 443 return; 444 if (first) { 445 first = 0; 446 if (gethostname(name, sizeof(name))) 447 err(1, "gethostname"); 448 hostdot = strchr(name, '.'); 449 } 450 if (hostdot && !strcasecmp(hostdot, argdot)) 451 *argdot = '\0'; 452 } 453 454 /* 455 * ttyconv -- 456 * convert tty to correct name. 457 */ 458 char * 459 ttyconv(char *arg) 460 { 461 char *mval; 462 463 /* 464 * kludge -- we assume that all tty's end with 465 * a two character suffix. 466 */ 467 if (strlen(arg) == 2) { 468 /* either 6 for "ttyxx" or 8 for "console" */ 469 if ((mval = malloc(8)) == NULL) 470 errx(1, "malloc failure"); 471 if (!strcmp(arg, "co")) 472 (void)strcpy(mval, "console"); 473 else { 474 (void)strcpy(mval, "tty"); 475 (void)strcpy(mval + 3, arg); 476 } 477 return (mval); 478 } 479 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 480 return (arg + 5); 481 return (arg); 482 } 483 484 /* 485 * dateconv -- 486 * Convert the snapshot time in command line given in the format 487 * [[CC]YY]MMDDhhmm[.SS]] to a time_t. 488 * Derived from atime_arg1() in usr.bin/touch/touch.c 489 */ 490 time_t 491 dateconv(char *arg) 492 { 493 time_t timet; 494 struct tm *t; 495 int yearset; 496 char *p; 497 498 /* Start with the current time. */ 499 if (time(&timet) < 0) 500 err(1, "time"); 501 if ((t = localtime(&timet)) == NULL) 502 err(1, "localtime"); 503 504 /* [[CC]YY]MMDDhhmm[.SS] */ 505 if ((p = strchr(arg, '.')) == NULL) 506 t->tm_sec = 0; /* Seconds defaults to 0. */ 507 else { 508 if (strlen(p + 1) != 2) 509 goto terr; 510 *p++ = '\0'; 511 t->tm_sec = ATOI2(p); 512 } 513 514 yearset = 0; 515 switch (strlen(arg)) { 516 case 12: /* CCYYMMDDhhmm */ 517 t->tm_year = ATOI2(arg); 518 t->tm_year *= 100; 519 yearset = 1; 520 /* FALLTHROUGH */ 521 case 10: /* YYMMDDhhmm */ 522 if (yearset) { 523 yearset = ATOI2(arg); 524 t->tm_year += yearset; 525 } else { 526 yearset = ATOI2(arg); 527 if (yearset < 69) 528 t->tm_year = yearset + 2000; 529 else 530 t->tm_year = yearset + 1900; 531 } 532 t->tm_year -= 1900; /* Convert to UNIX time. */ 533 /* FALLTHROUGH */ 534 case 8: /* MMDDhhmm */ 535 t->tm_mon = ATOI2(arg); 536 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 537 t->tm_mday = ATOI2(arg); 538 t->tm_hour = ATOI2(arg); 539 t->tm_min = ATOI2(arg); 540 break; 541 case 4: /* hhmm */ 542 t->tm_hour = ATOI2(arg); 543 t->tm_min = ATOI2(arg); 544 break; 545 default: 546 goto terr; 547 } 548 t->tm_isdst = -1; /* Figure out DST. */ 549 timet = mktime(t); 550 if (timet == -1) 551 terr: errx(1, 552 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 553 return timet; 554 } 555 556 557 /* 558 * onintr -- 559 * on interrupt, we inform the user how far we've gotten 560 */ 561 void 562 onintr(int signo) 563 { 564 char ct[80]; 565 struct tm *tm; 566 time_t t = _int_to_time(buf[0].ut_time); 567 568 tm = localtime(&t); 569 (void) strftime(ct, sizeof(ct), 570 d_first ? "%a %e %b %R" : "%a %b %e %R", 571 tm); 572 printf("\ninterrupted %s\n", ct); 573 if (signo == SIGINT) 574 exit(1); 575 (void)fflush(stdout); /* fix required for rsh */ 576 } 577