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