1 /* 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 2018 Philip Paeps 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1987, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 41 #endif /* not lint */ 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/capsicum.h> 47 #include <sys/queue.h> 48 #include <sys/stat.h> 49 50 #include <capsicum_helpers.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <langinfo.h> 55 #include <locale.h> 56 #include <paths.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <string.h> 61 #include <time.h> 62 #include <timeconv.h> 63 #include <unistd.h> 64 #include <utmpx.h> 65 66 #include <libxo/xo.h> 67 68 #define NO 0 /* false/no */ 69 #define YES 1 /* true/yes */ 70 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2; 71 72 typedef struct arg { 73 char *name; /* argument */ 74 #define REBOOT_TYPE -1 75 #define HOST_TYPE -2 76 #define TTY_TYPE -3 77 #define USER_TYPE -4 78 int type; /* type of arg */ 79 struct arg *next; /* linked list pointer */ 80 } ARG; 81 static ARG *arglist; /* head of linked list */ 82 83 static SLIST_HEAD(, idtab) idlist; 84 85 struct idtab { 86 time_t logout; /* log out time */ 87 char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */ 88 SLIST_ENTRY(idtab) list; 89 }; 90 91 static const char *crmsg; /* cause of last reboot */ 92 static time_t currentout; /* current logout value */ 93 static long maxrec; /* records to display */ 94 static const char *file = NULL; /* utx.log file */ 95 static int sflag = 0; /* show delta in seconds */ 96 static int width = 5; /* show seconds in delta */ 97 static int yflag; /* show year */ 98 static int d_first; 99 static int snapfound = 0; /* found snapshot entry? */ 100 static time_t snaptime; /* if != 0, we will only 101 * report users logged in 102 * at this snapshot time 103 */ 104 105 static void addarg(int, char *); 106 static time_t dateconv(char *); 107 static void doentry(struct utmpx *); 108 static void hostconv(char *); 109 static void printentry(struct utmpx *, struct idtab *); 110 static char *ttyconv(char *); 111 static int want(struct utmpx *); 112 static void usage(void); 113 static void wtmp(void); 114 115 static void 116 usage(void) 117 { 118 xo_error( 119 "usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n" 120 " [-n maxrec] [-t tty] [user ...]\n"); 121 exit(1); 122 } 123 124 int 125 main(int argc, char *argv[]) 126 { 127 int ch; 128 char *p; 129 130 (void) setlocale(LC_TIME, ""); 131 d_first = (*nl_langinfo(D_MD_ORDER) == 'd'); 132 133 argc = xo_parse_args(argc, argv); 134 if (argc < 0) 135 exit(1); 136 atexit(xo_finish_atexit); 137 138 maxrec = -1; 139 snaptime = 0; 140 while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -1) 141 switch (ch) { 142 case '0': case '1': case '2': case '3': case '4': 143 case '5': case '6': case '7': case '8': case '9': 144 /* 145 * kludge: last was originally designed to take 146 * a number after a dash. 147 */ 148 if (maxrec == -1) { 149 p = strchr(argv[optind - 1], ch); 150 if (p == NULL) 151 p = strchr(argv[optind], ch); 152 maxrec = atol(p); 153 if (!maxrec) 154 exit(0); 155 } 156 break; 157 case 'd': 158 snaptime = dateconv(optarg); 159 break; 160 case 'f': 161 file = optarg; 162 break; 163 case 'h': 164 hostconv(optarg); 165 addarg(HOST_TYPE, optarg); 166 break; 167 case 'n': 168 errno = 0; 169 maxrec = strtol(optarg, &p, 10); 170 if (p == optarg || *p != '\0' || errno != 0 || 171 maxrec <= 0) 172 xo_errx(1, "%s: bad line count", optarg); 173 break; 174 case 's': 175 sflag++; /* Show delta as seconds */ 176 break; 177 case 't': 178 addarg(TTY_TYPE, ttyconv(optarg)); 179 break; 180 case 'w': 181 width = 8; 182 break; 183 case 'y': 184 yflag++; 185 break; 186 case '?': 187 default: 188 usage(); 189 } 190 191 if (caph_limit_stdio() < 0) 192 xo_err(1, "can't limit stdio rights"); 193 194 caph_cache_catpages(); 195 caph_cache_tzdata(); 196 197 /* Cache UTX database. */ 198 if (setutxdb(UTXDB_LOG, file) != 0) 199 xo_err(1, "%s", file != NULL ? file : "(default utx db)"); 200 201 if (caph_enter() < 0) 202 xo_err(1, "cap_enter"); 203 204 if (sflag && width == 8) usage(); 205 206 if (argc) { 207 setlinebuf(stdout); 208 for (argv += optind; *argv; ++argv) { 209 if (strcmp(*argv, "reboot") == 0) 210 addarg(REBOOT_TYPE, *argv); 211 #define COMPATIBILITY 212 #ifdef COMPATIBILITY 213 /* code to allow "last p5" to work */ 214 addarg(TTY_TYPE, ttyconv(*argv)); 215 #endif 216 addarg(USER_TYPE, *argv); 217 } 218 } 219 wtmp(); 220 exit(0); 221 } 222 223 /* 224 * wtmp -- 225 * read through the utx.log file 226 */ 227 static void 228 wtmp(void) 229 { 230 struct utmpx *buf = NULL; 231 struct utmpx *ut; 232 static unsigned int amount = 0; 233 time_t t; 234 char ct[80]; 235 struct tm *tm; 236 237 SLIST_INIT(&idlist); 238 (void)time(&t); 239 240 xo_open_container("last-information"); 241 242 /* Load the last entries from the file. */ 243 while ((ut = getutxent()) != NULL) { 244 if (amount % 128 == 0) { 245 buf = realloc(buf, (amount + 128) * sizeof *ut); 246 if (buf == NULL) 247 xo_err(1, "realloc"); 248 } 249 memcpy(&buf[amount++], ut, sizeof *ut); 250 if (t > ut->ut_tv.tv_sec) 251 t = ut->ut_tv.tv_sec; 252 } 253 endutxent(); 254 255 /* Display them in reverse order. */ 256 xo_open_list("last"); 257 while (amount > 0) 258 doentry(&buf[--amount]); 259 xo_close_list("last"); 260 free(buf); 261 tm = localtime(&t); 262 (void) strftime(ct, sizeof(ct), "%+", tm); 263 xo_emit("\n{:utxdb/%s}", (file == NULL) ? "utx.log" : file); 264 xo_attr("seconds", "%lu", (unsigned long) t); 265 xo_emit(" begins {:begins/%s}\n", ct); 266 xo_close_container("last-information"); 267 } 268 269 /* 270 * doentry -- 271 * process a single utx.log entry 272 */ 273 static void 274 doentry(struct utmpx *bp) 275 { 276 struct idtab *tt; 277 278 /* the machine stopped */ 279 if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) { 280 /* everybody just logged out */ 281 while ((tt = SLIST_FIRST(&idlist)) != NULL) { 282 SLIST_REMOVE_HEAD(&idlist, list); 283 free(tt); 284 } 285 currentout = -bp->ut_tv.tv_sec; 286 crmsg = bp->ut_type != SHUTDOWN_TIME ? 287 "crash" : "shutdown"; 288 /* 289 * if we're in snapshot mode, we want to exit if this 290 * shutdown/reboot appears while we we are tracking the 291 * active range 292 */ 293 if (snaptime && snapfound) 294 exit(0); 295 /* 296 * don't print shutdown/reboot entries unless flagged for 297 */ 298 if (!snaptime && want(bp)) 299 printentry(bp, NULL); 300 return; 301 } 302 /* date got set */ 303 if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) { 304 if (want(bp) && !snaptime) 305 printentry(bp, NULL); 306 return; 307 } 308 309 if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS) 310 return; 311 312 /* find associated identifier */ 313 SLIST_FOREACH(tt, &idlist, list) 314 if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id)) 315 break; 316 317 if (tt == NULL) { 318 /* add new one */ 319 tt = malloc(sizeof(struct idtab)); 320 if (tt == NULL) 321 xo_errx(1, "malloc failure"); 322 tt->logout = currentout; 323 memcpy(tt->id, bp->ut_id, sizeof bp->ut_id); 324 SLIST_INSERT_HEAD(&idlist, tt, list); 325 } 326 327 /* 328 * print record if not in snapshot mode and wanted 329 * or in snapshot mode and in snapshot range 330 */ 331 if (bp->ut_type == USER_PROCESS && (want(bp) || 332 (bp->ut_tv.tv_sec < snaptime && 333 (tt->logout > snaptime || tt->logout < 1)))) { 334 snapfound = 1; 335 printentry(bp, tt); 336 } 337 tt->logout = bp->ut_tv.tv_sec; 338 } 339 340 /* 341 * printentry -- 342 * output an entry 343 * 344 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or 345 * logout type (crash/shutdown) as appropriate. 346 */ 347 static void 348 printentry(struct utmpx *bp, struct idtab *tt) 349 { 350 char ct[80]; 351 struct tm *tm; 352 time_t delta; /* time difference */ 353 time_t t; 354 355 if (maxrec != -1 && !maxrec--) 356 exit(0); 357 xo_open_instance("last"); 358 t = bp->ut_tv.tv_sec; 359 tm = localtime(&t); 360 (void) strftime(ct, sizeof(ct), d_first ? 361 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") : 362 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm); 363 switch (bp->ut_type) { 364 case BOOT_TIME: 365 xo_emit("{:user/%-42s/%s}", "boot time"); 366 break; 367 case SHUTDOWN_TIME: 368 xo_emit("{:user/%-42s/%s}", "shutdown time"); 369 break; 370 case OLD_TIME: 371 xo_emit("{:user/%-42s/%s}", "old time"); 372 break; 373 case NEW_TIME: 374 xo_emit("{:user/%-42s/%s}", "new time"); 375 break; 376 case USER_PROCESS: 377 xo_emit("{:user/%-10s/%s} {:tty/%-8s/%s} {:from/%-22.22s/%s}", 378 bp->ut_user, bp->ut_line, bp->ut_host); 379 break; 380 } 381 xo_attr("seconds", "%lu", (unsigned long)t); 382 xo_emit(" {:login-time/%s%c/%s}", ct, tt == NULL ? '\n' : ' '); 383 if (tt == NULL) 384 goto end; 385 if (!tt->logout) { 386 xo_emit(" {:logout-time/still logged in}\n"); 387 goto end; 388 } 389 if (tt->logout < 0) { 390 tt->logout = -tt->logout; 391 xo_emit("- {:logout-reason/%s}", crmsg); 392 } else { 393 tm = localtime(&tt->logout); 394 (void) strftime(ct, sizeof(ct), "%R", tm); 395 xo_attr("seconds", "%lu", (unsigned long)tt->logout); 396 xo_emit("- {:logout-time/%s}", ct); 397 } 398 delta = tt->logout - bp->ut_tv.tv_sec; 399 xo_attr("seconds", "%ld", (long)delta); 400 if (sflag) { 401 xo_emit(" ({:session-length/%8ld})\n", (long)delta); 402 } else { 403 tm = gmtime(&delta); 404 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm); 405 if (delta < 86400) 406 xo_emit(" ({:session-length/%s})\n", ct); 407 else 408 xo_emit(" ({:session-length/%ld+%s})\n", 409 (long)delta / 86400, ct); 410 } 411 412 end: 413 xo_close_instance("last"); 414 } 415 416 /* 417 * want -- 418 * see if want this entry 419 */ 420 static int 421 want(struct utmpx *bp) 422 { 423 ARG *step; 424 425 if (snaptime) 426 return (NO); 427 428 if (!arglist) 429 return (YES); 430 431 for (step = arglist; step; step = step->next) 432 switch(step->type) { 433 case REBOOT_TYPE: 434 if (bp->ut_type == BOOT_TIME || 435 bp->ut_type == SHUTDOWN_TIME) 436 return (YES); 437 break; 438 case HOST_TYPE: 439 if (!strcasecmp(step->name, bp->ut_host)) 440 return (YES); 441 break; 442 case TTY_TYPE: 443 if (!strcmp(step->name, bp->ut_line)) 444 return (YES); 445 break; 446 case USER_TYPE: 447 if (!strcmp(step->name, bp->ut_user)) 448 return (YES); 449 break; 450 } 451 return (NO); 452 } 453 454 /* 455 * addarg -- 456 * add an entry to a linked list of arguments 457 */ 458 static void 459 addarg(int type, char *arg) 460 { 461 ARG *cur; 462 463 if ((cur = malloc(sizeof(ARG))) == NULL) 464 xo_errx(1, "malloc failure"); 465 cur->next = arglist; 466 cur->type = type; 467 cur->name = arg; 468 arglist = cur; 469 } 470 471 /* 472 * hostconv -- 473 * convert the hostname to search pattern; if the supplied host name 474 * has a domain attached that is the same as the current domain, rip 475 * off the domain suffix since that's what login(1) does. 476 */ 477 static void 478 hostconv(char *arg) 479 { 480 static int first = 1; 481 static char *hostdot, name[MAXHOSTNAMELEN]; 482 char *argdot; 483 484 if (!(argdot = strchr(arg, '.'))) 485 return; 486 if (first) { 487 first = 0; 488 if (gethostname(name, sizeof(name))) 489 xo_err(1, "gethostname"); 490 hostdot = strchr(name, '.'); 491 } 492 if (hostdot && !strcasecmp(hostdot, argdot)) 493 *argdot = '\0'; 494 } 495 496 /* 497 * ttyconv -- 498 * convert tty to correct name. 499 */ 500 static char * 501 ttyconv(char *arg) 502 { 503 char *mval; 504 505 /* 506 * kludge -- we assume that all tty's end with 507 * a two character suffix. 508 */ 509 if (strlen(arg) == 2) { 510 /* either 6 for "ttyxx" or 8 for "console" */ 511 if ((mval = malloc(8)) == NULL) 512 xo_errx(1, "malloc failure"); 513 if (!strcmp(arg, "co")) 514 (void)strcpy(mval, "console"); 515 else { 516 (void)strcpy(mval, "tty"); 517 (void)strcpy(mval + 3, arg); 518 } 519 return (mval); 520 } 521 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 522 return (arg + 5); 523 return (arg); 524 } 525 526 /* 527 * dateconv -- 528 * Convert the snapshot time in command line given in the format 529 * [[CC]YY]MMDDhhmm[.SS]] to a time_t. 530 * Derived from atime_arg1() in usr.bin/touch/touch.c 531 */ 532 static time_t 533 dateconv(char *arg) 534 { 535 time_t timet; 536 struct tm *t; 537 int yearset; 538 char *p; 539 540 /* Start with the current time. */ 541 if (time(&timet) < 0) 542 xo_err(1, "time"); 543 if ((t = localtime(&timet)) == NULL) 544 xo_err(1, "localtime"); 545 546 /* [[CC]YY]MMDDhhmm[.SS] */ 547 if ((p = strchr(arg, '.')) == NULL) 548 t->tm_sec = 0; /* Seconds defaults to 0. */ 549 else { 550 if (strlen(p + 1) != 2) 551 goto terr; 552 *p++ = '\0'; 553 t->tm_sec = ATOI2(p); 554 } 555 556 yearset = 0; 557 switch (strlen(arg)) { 558 case 12: /* CCYYMMDDhhmm */ 559 t->tm_year = ATOI2(arg); 560 t->tm_year *= 100; 561 yearset = 1; 562 /* FALLTHROUGH */ 563 case 10: /* YYMMDDhhmm */ 564 if (yearset) { 565 yearset = ATOI2(arg); 566 t->tm_year += yearset; 567 } else { 568 yearset = ATOI2(arg); 569 if (yearset < 69) 570 t->tm_year = yearset + 2000; 571 else 572 t->tm_year = yearset + 1900; 573 } 574 t->tm_year -= 1900; /* Convert to UNIX time. */ 575 /* FALLTHROUGH */ 576 case 8: /* MMDDhhmm */ 577 t->tm_mon = ATOI2(arg); 578 --t->tm_mon; /* Convert from 01-12 to 00-11 */ 579 t->tm_mday = ATOI2(arg); 580 t->tm_hour = ATOI2(arg); 581 t->tm_min = ATOI2(arg); 582 break; 583 case 4: /* hhmm */ 584 t->tm_hour = ATOI2(arg); 585 t->tm_min = ATOI2(arg); 586 break; 587 default: 588 goto terr; 589 } 590 t->tm_isdst = -1; /* Figure out DST. */ 591 timet = mktime(t); 592 if (timet == -1) 593 terr: xo_errx(1, 594 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]"); 595 return timet; 596 } 597