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 * $FreeBSD$ 34 */ 35 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1987, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <fcntl.h> 51 #include <langinfo.h> 52 #include <locale.h> 53 #include <paths.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <time.h> 59 #include <unistd.h> 60 #include <utmp.h> 61 #include <sys/queue.h> 62 63 #define NO 0 /* false/no */ 64 #define YES 1 /* true/yes */ 65 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 66 67 static struct utmp buf[1024]; /* utmp read buffer */ 68 69 typedef struct arg { 70 char *name; /* argument */ 71 #define HOST_TYPE -2 72 #define TTY_TYPE -3 73 #define USER_TYPE -4 74 int type; /* type of arg */ 75 struct arg *next; /* linked list pointer */ 76 } ARG; 77 ARG *arglist; /* head of linked list */ 78 79 LIST_HEAD(ttylisthead, ttytab) ttylist; 80 81 struct ttytab { 82 time_t logout; /* log out time */ 83 char tty[UT_LINESIZE + 1]; /* terminal name */ 84 LIST_ENTRY(ttytab) list; 85 }; 86 87 static long currentout, /* current logout value */ 88 maxrec; /* records to display */ 89 static const char *file = _PATH_WTMP; /* wtmp file */ 90 static int sflag = 0; /* show delta in seconds */ 91 static int width = 5; /* show seconds in delta */ 92 static int d_first; 93 static time_t snaptime; /* if != 0, we will only 94 * report users logged in 95 * at this snapshot time 96 */ 97 98 void addarg __P((int, char *)); 99 time_t dateconv __P((char *)); 100 void hostconv __P((char *)); 101 void onintr __P((int)); 102 char *ttyconv __P((char *)); 103 int want __P((struct utmp *)); 104 void usage __P((void)); 105 void wtmp __P((void)); 106 107 void 108 usage(void) 109 { 110 (void)fprintf(stderr, 111 "usage: last [-#] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h hostname]\n" 112 "\t[-t tty] [-s|w] [user ...]\n"); 113 exit(1); 114 } 115 116 int 117 main(argc, argv) 118 int argc; 119 char *argv[]; 120 { 121 int ch; 122 char *p; 123 124 (void) setlocale(LC_TIME, ""); 125 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 126 127 maxrec = -1; 128 snaptime = 0; 129 while ((ch = getopt(argc, argv, "0123456789d:f:h:st:w")) != -1) 130 switch (ch) { 131 case '0': case '1': case '2': case '3': case '4': 132 case '5': case '6': case '7': case '8': case '9': 133 /* 134 * kludge: last was originally designed to take 135 * a number after a dash. 136 */ 137 if (maxrec == -1) { 138 p = argv[optind - 1]; 139 if (p[0] == '-' && p[1] == ch && !p[2]) 140 maxrec = atol(++p); 141 else 142 maxrec = atol(argv[optind] + 1); 143 if (!maxrec) 144 exit(0); 145 } 146 break; 147 case 'd': 148 snaptime = dateconv(optarg); 149 break; 150 case 'f': 151 file = optarg; 152 break; 153 case 'h': 154 hostconv(optarg); 155 addarg(HOST_TYPE, optarg); 156 break; 157 case 's': 158 sflag++; /* Show delta as seconds */ 159 break; 160 case 't': 161 addarg(TTY_TYPE, ttyconv(optarg)); 162 break; 163 case 'w': 164 width = 8; 165 break; 166 case '?': 167 default: 168 usage(); 169 } 170 171 if (sflag && width == 8) usage(); 172 173 if (argc) { 174 setlinebuf(stdout); 175 for (argv += optind; *argv; ++argv) { 176 #define COMPATIBILITY 177 #ifdef COMPATIBILITY 178 /* code to allow "last p5" to work */ 179 addarg(TTY_TYPE, ttyconv(*argv)); 180 #endif 181 addarg(USER_TYPE, *argv); 182 } 183 } 184 wtmp(); 185 exit(0); 186 } 187 188 /* 189 * wtmp -- 190 * read through the wtmp file 191 */ 192 void 193 wtmp() 194 { 195 struct utmp *bp; /* current structure */ 196 struct ttytab *tt, *ttx; /* ttylist entry */ 197 struct stat stb; /* stat of file for size */ 198 long bl; 199 time_t delta; /* time difference */ 200 int bytes, wfd; 201 const char *crmsg; 202 char ct[80]; 203 struct tm *tm; 204 int snapfound = 0; /* found snapshot entry? */ 205 time_t t; 206 207 LIST_INIT(&ttylist); 208 209 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 210 err(1, "%s", file); 211 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 212 213 (void)time(&t); 214 buf[0].ut_time = _time_to_int(t); 215 (void)signal(SIGINT, onintr); 216 (void)signal(SIGQUIT, onintr); 217 218 while (--bl >= 0) { 219 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 220 (bytes = read(wfd, buf, sizeof(buf))) == -1) 221 err(1, "%s", file); 222 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 223 /* 224 * if the terminal line is '~', the machine stopped. 225 * see utmp(5) for more info. 226 */ 227 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 228 /* everybody just logged out */ 229 for (tt = LIST_FIRST(&ttylist); tt;) { 230 LIST_REMOVE(tt, list); 231 ttx = tt; 232 tt = LIST_NEXT(tt, list); 233 free(ttx); 234 } 235 currentout = -bp->ut_time; 236 crmsg = strncmp(bp->ut_name, "shutdown", 237 UT_NAMESIZE) ? "crash" : "shutdown"; 238 /* 239 * if we're in snapshot mode, we want to 240 * exit if this shutdown/reboot appears 241 * while we we are tracking the active 242 * range 243 */ 244 if (snaptime && snapfound) 245 return; 246 /* 247 * don't print shutdown/reboot entries 248 * unless flagged for 249 */ 250 if (!snaptime && want(bp)) { 251 t = _int_to_time(bp->ut_time); 252 tm = localtime(&t); 253 (void) strftime(ct, sizeof(ct), 254 d_first ? "%a %e %b %R" : 255 "%a %b %e %R", 256 tm); 257 printf("%-*.*s %-*.*s %-*.*s %s\n", 258 UT_NAMESIZE, UT_NAMESIZE, 259 bp->ut_name, UT_LINESIZE, 260 UT_LINESIZE, bp->ut_line, 261 UT_HOSTSIZE, UT_HOSTSIZE, 262 bp->ut_host, ct); 263 if (maxrec != -1 && !--maxrec) 264 return; 265 } 266 continue; 267 } 268 /* 269 * if the line is '{' or '|', date got set; see 270 * utmp(5) for more info. 271 */ 272 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 273 && !bp->ut_line[1]) { 274 if (want(bp) && !snaptime) { 275 t = _int_to_time(bp->ut_time); 276 tm = localtime(&t); 277 (void) strftime(ct, sizeof(ct), 278 d_first ? "%a %e %b %R" : 279 "%a %b %e %R", 280 tm); 281 printf("%-*.*s %-*.*s %-*.*s %s\n", 282 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 283 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 284 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 285 ct); 286 if (maxrec && !--maxrec) 287 return; 288 } 289 continue; 290 } 291 /* find associated tty */ 292 LIST_FOREACH(tt, &ttylist, list) 293 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 294 break; 295 296 if (tt == NULL) { 297 /* add new one */ 298 tt = malloc(sizeof(struct ttytab)); 299 if (tt == NULL) 300 err(1, "malloc failure"); 301 tt->logout = currentout; 302 strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 303 LIST_INSERT_HEAD(&ttylist, tt, list); 304 } 305 306 /* 307 * print record if not in snapshot mode and wanted 308 * or in snapshot mode and in snapshot range 309 */ 310 if (bp->ut_name[0] && (want(bp) || 311 (bp->ut_time < snaptime && 312 (tt->logout > snaptime || tt->logout < 1)))) { 313 snapfound = 1; 314 /* 315 * when uucp and ftp log in over a network, the entry in 316 * the utmp file is the name plus their process id. See 317 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 318 */ 319 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 320 bp->ut_line[3] = '\0'; 321 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 322 bp->ut_line[4] = '\0'; 323 t = _int_to_time(bp->ut_time); 324 tm = localtime(&t); 325 (void) strftime(ct, sizeof(ct), 326 d_first ? "%a %e %b %R" : 327 "%a %b %e %R", 328 tm); 329 printf("%-*.*s %-*.*s %-*.*s %s ", 330 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 331 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 332 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 333 ct); 334 if (!tt->logout) 335 puts(" still logged in"); 336 else { 337 if (tt->logout < 0) { 338 tt->logout = -tt->logout; 339 printf("- %s", crmsg); 340 } 341 else { 342 tm = localtime(&tt->logout); 343 (void) strftime(ct, sizeof(ct), "%R", tm); 344 printf("- %s", ct); 345 } 346 delta = tt->logout - bp->ut_time; 347 if ( sflag ) { 348 printf(" (%8ld)\n", 349 (long)delta); 350 } else { 351 tm = gmtime(&delta); 352 (void) strftime(ct, sizeof(ct), 353 width >= 8 ? "%T" : "%R", 354 tm); 355 if (delta < 86400) 356 printf(" (%s)\n", ct); 357 else 358 printf(" (%ld+%s)\n", 359 (long)delta / 360 86400, ct); 361 } 362 } 363 if (maxrec != -1 && !--maxrec) 364 return; 365 } 366 tt->logout = bp->ut_time; 367 } 368 } 369 t = _int_to_time(buf[0].ut_time); 370 tm = localtime(&t); 371 (void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm); 372 printf("%s", ct); 373 } 374 375 /* 376 * want -- 377 * see if want this entry 378 */ 379 int 380 want(bp) 381 struct utmp *bp; 382 { 383 ARG *step; 384 385 if (snaptime) 386 return (NO); 387 388 if (!arglist) 389 return (YES); 390 391 for (step = arglist; step; step = step->next) 392 switch(step->type) { 393 case HOST_TYPE: 394 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 395 return (YES); 396 break; 397 case TTY_TYPE: 398 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 399 return (YES); 400 break; 401 case USER_TYPE: 402 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 403 return (YES); 404 break; 405 } 406 return (NO); 407 } 408 409 /* 410 * addarg -- 411 * add an entry to a linked list of arguments 412 */ 413 void 414 addarg(type, arg) 415 int type; 416 char *arg; 417 { 418 ARG *cur; 419 420 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 421 err(1, "malloc failure"); 422 cur->next = arglist; 423 cur->type = type; 424 cur->name = arg; 425 arglist = cur; 426 } 427 428 /* 429 * hostconv -- 430 * convert the hostname to search pattern; if the supplied host name 431 * has a domain attached that is the same as the current domain, rip 432 * off the domain suffix since that's what login(1) does. 433 */ 434 void 435 hostconv(arg) 436 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(arg) 460 char *arg; 461 { 462 char *mval; 463 464 /* 465 * kludge -- we assume that all tty's end with 466 * a two character suffix. 467 */ 468 if (strlen(arg) == 2) { 469 /* either 6 for "ttyxx" or 8 for "console" */ 470 if (!(mval = malloc((u_int)8))) 471 err(1, "malloc failure"); 472 if (!strcmp(arg, "co")) 473 (void)strcpy(mval, "console"); 474 else { 475 (void)strcpy(mval, "tty"); 476 (void)strcpy(mval + 3, arg); 477 } 478 return (mval); 479 } 480 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 481 return (arg + 5); 482 return (arg); 483 } 484 485 /* 486 * dateconv -- 487 * Convert the snapshot time in command line given in the format 488 * [[CC]YY]MMDDhhmm[.SS]] to a time_t. 489 * Derived from atime_arg1() in usr.bin/touch/touch.c 490 */ 491 time_t 492 dateconv(arg) 493 char *arg; 494 { 495 time_t timet; 496 struct tm *t; 497 int yearset; 498 char *p; 499 500 /* Start with the current time. */ 501 if (time(&timet) < 0) 502 err(1, "time"); 503 if ((t = localtime(&timet)) == NULL) 504 err(1, "localtime"); 505 506 /* [[CC]YY]MMDDhhmm[.SS] */ 507 if ((p = strchr(arg, '.')) == NULL) 508 t->tm_sec = 0; /* Seconds defaults to 0. */ 509 else { 510 if (strlen(p + 1) != 2) 511 goto terr; 512 *p++ = '\0'; 513 t->tm_sec = ATOI2(p); 514 } 515 516 yearset = 0; 517 switch (strlen(arg)) { 518 case 12: /* CCYYMMDDhhmm */ 519 t->tm_year = ATOI2(arg); 520 t->tm_year *= 100; 521 yearset = 1; 522 /* FALLTHOUGH */ 523 case 10: /* YYMMDDhhmm */ 524 if (yearset) { 525 yearset = ATOI2(arg); 526 t->tm_year += yearset; 527 } else { 528 yearset = ATOI2(arg); 529 if (yearset < 69) 530 t->tm_year = yearset + 2000; 531 else 532 t->tm_year = yearset + 1900; 533 } 534 t->tm_year -= 1900; /* Convert to UNIX time. */ 535 /* FALLTHROUGH */ 536 case 8: /* MMDDhhmm */ 537 t->tm_mon = ATOI2(arg); 538 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 539 t->tm_mday = ATOI2(arg); 540 t->tm_hour = ATOI2(arg); 541 t->tm_min = ATOI2(arg); 542 break; 543 case 4: /* hhmm */ 544 t->tm_hour = ATOI2(arg); 545 t->tm_min = ATOI2(arg); 546 break; 547 default: 548 goto terr; 549 } 550 t->tm_isdst = -1; /* Figure out DST. */ 551 timet = mktime(t); 552 if (timet == -1) 553 terr: errx(1, 554 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 555 return timet; 556 } 557 558 559 /* 560 * onintr -- 561 * on interrupt, we inform the user how far we've gotten 562 */ 563 void 564 onintr(signo) 565 int signo; 566 { 567 char ct[80]; 568 struct tm *tm; 569 time_t t = _int_to_time(buf[0].ut_time); 570 571 tm = localtime(&t); 572 (void) strftime(ct, sizeof(ct), 573 d_first ? "%a %e %b %R" : "%a %b %e %R", 574 tm); 575 printf("\ninterrupted %s\n", ct); 576 if (signo == SIGINT) 577 exit(1); 578 (void)fflush(stdout); /* fix required for rsh */ 579 } 580