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 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 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 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 void hostconv __P((char *)); 100 void onintr __P((int)); 101 char *ttyconv __P((char *)); 102 time_t dateconv __P((char *)); 103 int want __P((struct utmp *)); 104 void wtmp __P((void)); 105 106 void 107 usage(void) 108 { 109 (void)fprintf(stderr, 110 "usage: last [-#] [-f file] [-h hostname] [-t tty] [-s|w] [user ...]\n"); 111 exit(1); 112 } 113 114 int 115 main(argc, argv) 116 int argc; 117 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:st:w")) != -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 = argv[optind - 1]; 137 if (p[0] == '-' && p[1] == ch && !p[2]) 138 maxrec = atol(++p); 139 else 140 maxrec = atol(argv[optind] + 1); 141 if (!maxrec) 142 exit(0); 143 } 144 break; 145 case 'd': 146 snaptime = dateconv(optarg); 147 break; 148 case 'f': 149 file = optarg; 150 break; 151 case 'h': 152 hostconv(optarg); 153 addarg(HOST_TYPE, optarg); 154 break; 155 case 's': 156 sflag++; /* Show delta as seconds */ 157 break; 158 case 't': 159 addarg(TTY_TYPE, ttyconv(optarg)); 160 break; 161 case 'w': 162 width = 8; 163 break; 164 case '?': 165 default: 166 usage(); 167 } 168 169 if (sflag && width == 8) usage(); 170 171 if (argc) { 172 setlinebuf(stdout); 173 for (argv += optind; *argv; ++argv) { 174 #define COMPATIBILITY 175 #ifdef COMPATIBILITY 176 /* code to allow "last p5" to work */ 177 addarg(TTY_TYPE, ttyconv(*argv)); 178 #endif 179 addarg(USER_TYPE, *argv); 180 } 181 } 182 wtmp(); 183 exit(0); 184 } 185 186 /* 187 * wtmp -- 188 * read through the wtmp file 189 */ 190 void 191 wtmp() 192 { 193 struct utmp *bp; /* current structure */ 194 struct ttytab *tt, *ttx; /* ttylist entry */ 195 struct stat stb; /* stat of file for size */ 196 long bl; 197 time_t delta; /* time difference */ 198 int bytes, wfd; 199 char *crmsg; 200 char ct[80]; 201 struct tm *tm; 202 int snapfound = 0; /* found snapshot entry? */ 203 204 LIST_INIT(&ttylist); 205 206 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 207 err(1, "%s", file); 208 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 209 210 (void)time(&buf[0].ut_time); 211 (void)signal(SIGINT, onintr); 212 (void)signal(SIGQUIT, onintr); 213 214 while (--bl >= 0) { 215 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 216 (bytes = read(wfd, buf, sizeof(buf))) == -1) 217 err(1, "%s", file); 218 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 219 /* 220 * if the terminal line is '~', the machine stopped. 221 * see utmp(5) for more info. 222 */ 223 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 224 /* everybody just logged out */ 225 for (tt = LIST_FIRST(&ttylist); tt;) { 226 LIST_REMOVE(tt, list); 227 ttx = tt; 228 tt = LIST_NEXT(tt, list); 229 free(ttx); 230 } 231 currentout = -bp->ut_time; 232 crmsg = strncmp(bp->ut_name, "shutdown", 233 UT_NAMESIZE) ? "crash" : "shutdown"; 234 /* 235 * if we're in snapshot mode, we want to 236 * exit if this shutdown/reboot appears 237 * while we we are tracking the active 238 * range 239 */ 240 if (snaptime && snapfound) 241 return; 242 /* 243 * don't print shutdown/reboot entries 244 * unless flagged for 245 */ 246 if (!snaptime && want(bp)) { 247 tm = localtime(&bp->ut_time); 248 (void) strftime(ct, sizeof(ct), 249 d_first ? "%a %e %b %R" : 250 "%a %b %e %R", 251 tm); 252 printf("%-*.*s %-*.*s %-*.*s %s\n", 253 UT_NAMESIZE, UT_NAMESIZE, 254 bp->ut_name, UT_LINESIZE, 255 UT_LINESIZE, bp->ut_line, 256 UT_HOSTSIZE, UT_HOSTSIZE, 257 bp->ut_host, ct); 258 if (maxrec != -1 && !--maxrec) 259 return; 260 } 261 continue; 262 } 263 /* 264 * if the line is '{' or '|', date got set; see 265 * utmp(5) for more info. 266 */ 267 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 268 && !bp->ut_line[1]) { 269 if (want(bp) && !snaptime) { 270 tm = localtime(&bp->ut_time); 271 (void) strftime(ct, sizeof(ct), 272 d_first ? "%a %e %b %R" : 273 "%a %b %e %R", 274 tm); 275 printf("%-*.*s %-*.*s %-*.*s %s\n", 276 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 277 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 278 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 279 ct); 280 if (maxrec && !--maxrec) 281 return; 282 } 283 continue; 284 } 285 /* find associated tty */ 286 LIST_FOREACH(tt, &ttylist, list) 287 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 288 break; 289 290 if (tt == NULL) { 291 /* add new one */ 292 tt = malloc(sizeof(struct ttytab)); 293 if (tt == NULL) 294 err(1, "malloc failure"); 295 tt->logout = currentout; 296 strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 297 LIST_INSERT_HEAD(&ttylist, tt, list); 298 } 299 300 /* 301 * print record if not in snapshot mode and wanted 302 * or in snapshot mode and in snapshot range 303 */ 304 if (bp->ut_name[0] && (want(bp) || 305 (bp->ut_time < snaptime && 306 (tt->logout > snaptime || tt->logout < 1)))) { 307 snapfound = 1; 308 /* 309 * when uucp and ftp log in over a network, the entry in 310 * the utmp file is the name plus their process id. See 311 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 312 */ 313 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 314 bp->ut_line[3] = '\0'; 315 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 316 bp->ut_line[4] = '\0'; 317 tm = localtime(&bp->ut_time); 318 (void) strftime(ct, sizeof(ct), 319 d_first ? "%a %e %b %R" : 320 "%a %b %e %R", 321 tm); 322 printf("%-*.*s %-*.*s %-*.*s %s ", 323 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 324 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 325 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 326 ct); 327 if (!tt->logout) 328 puts(" still logged in"); 329 else { 330 if (tt->logout < 0) { 331 tt->logout = -tt->logout; 332 printf("- %s", crmsg); 333 } 334 else { 335 tm = localtime(&tt->logout); 336 (void) strftime(ct, sizeof(ct), "%R", tm); 337 printf("- %s", ct); 338 } 339 delta = tt->logout - bp->ut_time; 340 if ( sflag ) { 341 printf(" (%8lu)\n", 342 delta); 343 } else { 344 tm = gmtime(&delta); 345 (void) strftime(ct, sizeof(ct), 346 width >= 8 ? "%T" : "%R", 347 tm); 348 if (delta < 86400) 349 printf(" (%s)\n", ct); 350 else 351 printf(" (%ld+%s)\n", 352 delta / 86400, ct); 353 } 354 } 355 if (maxrec != -1 && !--maxrec) 356 return; 357 } 358 tt->logout = bp->ut_time; 359 } 360 } 361 tm = localtime(&buf[0].ut_time); 362 (void) strftime(ct, sizeof(ct), "\nwtmp begins %c\n", tm); 363 printf("%s", ct); 364 } 365 366 /* 367 * want -- 368 * see if want this entry 369 */ 370 int 371 want(bp) 372 struct utmp *bp; 373 { 374 ARG *step; 375 376 if (snaptime) 377 return (NO); 378 379 if (!arglist) 380 return (YES); 381 382 for (step = arglist; step; step = step->next) 383 switch(step->type) { 384 case HOST_TYPE: 385 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 386 return (YES); 387 break; 388 case TTY_TYPE: 389 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 390 return (YES); 391 break; 392 case USER_TYPE: 393 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 394 return (YES); 395 break; 396 } 397 return (NO); 398 } 399 400 /* 401 * addarg -- 402 * add an entry to a linked list of arguments 403 */ 404 void 405 addarg(type, arg) 406 int type; 407 char *arg; 408 { 409 ARG *cur; 410 411 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 412 err(1, "malloc failure"); 413 cur->next = arglist; 414 cur->type = type; 415 cur->name = arg; 416 arglist = cur; 417 } 418 419 /* 420 * hostconv -- 421 * convert the hostname to search pattern; if the supplied host name 422 * has a domain attached that is the same as the current domain, rip 423 * off the domain suffix since that's what login(1) does. 424 */ 425 void 426 hostconv(arg) 427 char *arg; 428 { 429 static int first = 1; 430 static char *hostdot, name[MAXHOSTNAMELEN]; 431 char *argdot; 432 433 if (!(argdot = strchr(arg, '.'))) 434 return; 435 if (first) { 436 first = 0; 437 if (gethostname(name, sizeof(name))) 438 err(1, "gethostname"); 439 hostdot = strchr(name, '.'); 440 } 441 if (hostdot && !strcasecmp(hostdot, argdot)) 442 *argdot = '\0'; 443 } 444 445 /* 446 * ttyconv -- 447 * convert tty to correct name. 448 */ 449 char * 450 ttyconv(arg) 451 char *arg; 452 { 453 char *mval; 454 455 /* 456 * kludge -- we assume that all tty's end with 457 * a two character suffix. 458 */ 459 if (strlen(arg) == 2) { 460 /* either 6 for "ttyxx" or 8 for "console" */ 461 if (!(mval = malloc((u_int)8))) 462 err(1, "malloc failure"); 463 if (!strcmp(arg, "co")) 464 (void)strcpy(mval, "console"); 465 else { 466 (void)strcpy(mval, "tty"); 467 (void)strcpy(mval + 3, arg); 468 } 469 return (mval); 470 } 471 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 472 return (arg + 5); 473 return (arg); 474 } 475 476 /* 477 * dateconv -- 478 * Convert the snapshot time in command line given in the format 479 * [[CC]YY]MMDDhhmm[.SS]] to a time_t. 480 * Derived from atime_arg1() in usr.bin/touch/touch.c 481 */ 482 time_t 483 dateconv(arg) 484 char *arg; 485 { 486 time_t timet; 487 struct tm *t; 488 int yearset; 489 char *p; 490 491 /* Start with the current time. */ 492 if (time(&timet) < 0) 493 err(1, "time"); 494 if ((t = localtime(&timet)) == NULL) 495 err(1, "localtime"); 496 497 /* [[CC]YY]MMDDhhmm[.SS] */ 498 if ((p = strchr(arg, '.')) == NULL) 499 t->tm_sec = 0; /* Seconds defaults to 0. */ 500 else { 501 if (strlen(p + 1) != 2) 502 goto terr; 503 *p++ = '\0'; 504 t->tm_sec = ATOI2(p); 505 } 506 507 yearset = 0; 508 switch (strlen(arg)) { 509 case 12: /* CCYYMMDDhhmm */ 510 t->tm_year = ATOI2(arg); 511 t->tm_year *= 100; 512 yearset = 1; 513 /* FALLTHOUGH */ 514 case 10: /* YYMMDDhhmm */ 515 if (yearset) { 516 yearset = ATOI2(arg); 517 t->tm_year += yearset; 518 } else { 519 yearset = ATOI2(arg); 520 if (yearset < 69) 521 t->tm_year = yearset + 2000; 522 else 523 t->tm_year = yearset + 1900; 524 } 525 t->tm_year -= 1900; /* Convert to UNIX time. */ 526 /* FALLTHROUGH */ 527 case 8: /* MMDDhhmm */ 528 t->tm_mon = ATOI2(arg); 529 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 530 t->tm_mday = ATOI2(arg); 531 t->tm_hour = ATOI2(arg); 532 t->tm_min = ATOI2(arg); 533 break; 534 case 4: /* hhmm */ 535 t->tm_hour = ATOI2(arg); 536 t->tm_min = ATOI2(arg); 537 break; 538 default: 539 goto terr; 540 } 541 t->tm_isdst = -1; /* Figure out DST. */ 542 timet = mktime(t); 543 if (timet == -1) 544 terr: errx(1, 545 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 546 return timet; 547 } 548 549 550 /* 551 * onintr -- 552 * on interrupt, we inform the user how far we've gotten 553 */ 554 void 555 onintr(signo) 556 int signo; 557 { 558 char ct[80]; 559 struct tm *tm; 560 561 tm = localtime(&buf[0].ut_time); 562 (void) strftime(ct, sizeof(ct), 563 d_first ? "%a %e %b %R" : "%a %b %e %R", 564 tm); 565 printf("\ninterrupted %s\n", ct); 566 if (signo == SIGINT) 567 exit(1); 568 (void)fflush(stdout); /* fix required for rsh */ 569 } 570