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 <locale.h> 52 #include <paths.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <time.h> 58 #include <unistd.h> 59 #include <utmp.h> 60 #include <sys/queue.h> 61 62 #define NO 0 /* false/no */ 63 #define YES 1 /* true/yes */ 64 65 static struct utmp buf[1024]; /* utmp read buffer */ 66 67 typedef struct arg { 68 char *name; /* argument */ 69 #define HOST_TYPE -2 70 #define TTY_TYPE -3 71 #define USER_TYPE -4 72 int type; /* type of arg */ 73 struct arg *next; /* linked list pointer */ 74 } ARG; 75 ARG *arglist; /* head of linked list */ 76 77 LIST_HEAD(ttylisthead, ttytab) ttylist; 78 79 struct ttytab { 80 time_t logout; /* log out time */ 81 char tty[UT_LINESIZE + 1]; /* terminal name */ 82 LIST_ENTRY(ttytab) list; 83 }; 84 85 static long currentout, /* current logout value */ 86 maxrec; /* records to display */ 87 static char *file = _PATH_WTMP; /* wtmp file */ 88 static int sflag = 0; /* show delta in seconds */ 89 static int width = 5; /* show seconds in delta */ 90 91 void addarg __P((int, char *)); 92 void hostconv __P((char *)); 93 void onintr __P((int)); 94 char *ttyconv __P((char *)); 95 int want __P((struct utmp *)); 96 void wtmp __P((void)); 97 98 void 99 usage(void) 100 { 101 (void)fprintf(stderr, 102 "usage: last [-#] [-f file] [-h hostname] [-t tty] [-s|w] [user ...]\n"); 103 exit(1); 104 } 105 106 int 107 main(argc, argv) 108 int argc; 109 char *argv[]; 110 { 111 extern int optind; 112 extern char *optarg; 113 int ch; 114 char *p; 115 116 (void) setlocale(LC_TIME, ""); 117 118 maxrec = -1; 119 while ((ch = getopt(argc, argv, "0123456789f:h:st:w")) != -1) 120 switch (ch) { 121 case '0': case '1': case '2': case '3': case '4': 122 case '5': case '6': case '7': case '8': case '9': 123 /* 124 * kludge: last was originally designed to take 125 * a number after a dash. 126 */ 127 if (maxrec == -1) { 128 p = argv[optind - 1]; 129 if (p[0] == '-' && p[1] == ch && !p[2]) 130 maxrec = atol(++p); 131 else 132 maxrec = atol(argv[optind] + 1); 133 if (!maxrec) 134 exit(0); 135 } 136 break; 137 case 'f': 138 file = optarg; 139 break; 140 case 'h': 141 hostconv(optarg); 142 addarg(HOST_TYPE, optarg); 143 break; 144 case 's': 145 sflag++; /* Show delta as seconds */ 146 break; 147 case 't': 148 addarg(TTY_TYPE, ttyconv(optarg)); 149 break; 150 case 'w': 151 width = 8; 152 break; 153 case '?': 154 default: 155 usage(); 156 } 157 158 if (sflag && width == 8) usage(); 159 160 if (argc) { 161 setlinebuf(stdout); 162 for (argv += optind; *argv; ++argv) { 163 #define COMPATIBILITY 164 #ifdef COMPATIBILITY 165 /* code to allow "last p5" to work */ 166 addarg(TTY_TYPE, ttyconv(*argv)); 167 #endif 168 addarg(USER_TYPE, *argv); 169 } 170 } 171 wtmp(); 172 exit(0); 173 } 174 175 /* 176 * wtmp -- 177 * read through the wtmp file 178 */ 179 void 180 wtmp() 181 { 182 struct utmp *bp; /* current structure */ 183 struct ttytab *tt, *ttx; /* ttylist entry */ 184 struct stat stb; /* stat of file for size */ 185 long bl; 186 time_t delta; /* time difference */ 187 int bytes, wfd; 188 char *crmsg; 189 char ct[80]; 190 struct tm *tm; 191 192 LIST_INIT(&ttylist); 193 194 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 195 err(1, "%s", file); 196 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 197 198 (void)time(&buf[0].ut_time); 199 (void)signal(SIGINT, onintr); 200 (void)signal(SIGQUIT, onintr); 201 202 while (--bl >= 0) { 203 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 204 (bytes = read(wfd, buf, sizeof(buf))) == -1) 205 err(1, "%s", file); 206 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 207 /* 208 * if the terminal line is '~', the machine stopped. 209 * see utmp(5) for more info. 210 */ 211 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 212 /* everybody just logged out */ 213 for (tt = ttylist.lh_first; tt;) { 214 LIST_REMOVE(tt, list); 215 ttx = tt; 216 tt = tt->list.le_next; 217 free(ttx); 218 } 219 currentout = -bp->ut_time; 220 crmsg = strncmp(bp->ut_name, "shutdown", 221 UT_NAMESIZE) ? "crash" : "shutdown"; 222 if (want(bp)) { 223 tm = localtime(&bp->ut_time); 224 (void) strftime(ct, sizeof(ct), "%c", tm); 225 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 226 UT_NAMESIZE, UT_NAMESIZE, 227 bp->ut_name, UT_LINESIZE, 228 UT_LINESIZE, bp->ut_line, 229 UT_HOSTSIZE, UT_HOSTSIZE, 230 bp->ut_host, ct, ct + 11); 231 if (maxrec != -1 && !--maxrec) 232 return; 233 } 234 continue; 235 } 236 /* 237 * if the line is '{' or '|', date got set; see 238 * utmp(5) for more info. 239 */ 240 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 241 && !bp->ut_line[1]) { 242 if (want(bp)) { 243 tm = localtime(&bp->ut_time); 244 (void) strftime(ct, sizeof(ct), "%c", tm); 245 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 246 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 247 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 248 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 249 ct, ct + 11); 250 if (maxrec && !--maxrec) 251 return; 252 } 253 continue; 254 } 255 if (bp->ut_name[0] == '\0' || want(bp)) { 256 /* find associated tty */ 257 for (tt = ttylist.lh_first; ; tt = tt->list.le_next) { 258 if (tt == NULL) { 259 /* add new one */ 260 tt = malloc(sizeof(struct ttytab)); 261 if (tt == NULL) 262 err(1, "malloc failure"); 263 tt->logout = currentout; 264 strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 265 LIST_INSERT_HEAD(&ttylist, tt, list); 266 break; 267 } 268 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 269 break; 270 } 271 if (bp->ut_name[0]) { 272 /* 273 * when uucp and ftp log in over a network, the entry in 274 * the utmp file is the name plus their process id. See 275 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 276 */ 277 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 278 bp->ut_line[3] = '\0'; 279 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 280 bp->ut_line[4] = '\0'; 281 tm = localtime(&bp->ut_time); 282 (void) strftime(ct, sizeof(ct), "%c", tm); 283 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 284 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 285 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 286 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 287 ct, ct + 11); 288 if (!tt->logout) 289 puts(" still logged in"); 290 else { 291 if (tt->logout < 0) { 292 tt->logout = -tt->logout; 293 printf("- %s", crmsg); 294 } 295 else { 296 tm = localtime(&tt->logout); 297 (void) strftime(ct, sizeof(ct), "%c", tm); 298 printf("- %5.5s", ct + 11); 299 } 300 delta = tt->logout - bp->ut_time; 301 if ( sflag ) { 302 printf(" (%8lu)\n", 303 delta); 304 } else { 305 tm = gmtime(&delta); 306 (void) strftime(ct, sizeof(ct), "%c", tm); 307 if (delta < 86400) 308 printf(" (%*.*s)\n", width, width, ct + 11); 309 else 310 printf(" (%ld+%*.*s)\n", 311 delta / 86400, width, width, ct + 11); 312 } 313 } 314 LIST_REMOVE(tt, list); 315 free(tt); 316 if (maxrec != -1 && !--maxrec) 317 return; 318 } else { 319 tt->logout = bp->ut_time; 320 } 321 } 322 } 323 } 324 tm = localtime(&buf[0].ut_time); 325 (void) strftime(ct, sizeof(ct), "\nwtmp begins %c\n", tm); 326 printf("%s", ct); 327 } 328 329 /* 330 * want -- 331 * see if want this entry 332 */ 333 int 334 want(bp) 335 struct utmp *bp; 336 { 337 ARG *step; 338 339 if (!arglist) 340 return (YES); 341 342 for (step = arglist; step; step = step->next) 343 switch(step->type) { 344 case HOST_TYPE: 345 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 346 return (YES); 347 break; 348 case TTY_TYPE: 349 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 350 return (YES); 351 break; 352 case USER_TYPE: 353 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 354 return (YES); 355 break; 356 } 357 return (NO); 358 } 359 360 /* 361 * addarg -- 362 * add an entry to a linked list of arguments 363 */ 364 void 365 addarg(type, arg) 366 int type; 367 char *arg; 368 { 369 ARG *cur; 370 371 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 372 err(1, "malloc failure"); 373 cur->next = arglist; 374 cur->type = type; 375 cur->name = arg; 376 arglist = cur; 377 } 378 379 /* 380 * hostconv -- 381 * convert the hostname to search pattern; if the supplied host name 382 * has a domain attached that is the same as the current domain, rip 383 * off the domain suffix since that's what login(1) does. 384 */ 385 void 386 hostconv(arg) 387 char *arg; 388 { 389 static int first = 1; 390 static char *hostdot, name[MAXHOSTNAMELEN]; 391 char *argdot; 392 393 if (!(argdot = strchr(arg, '.'))) 394 return; 395 if (first) { 396 first = 0; 397 if (gethostname(name, sizeof(name))) 398 err(1, "gethostname"); 399 hostdot = strchr(name, '.'); 400 } 401 if (hostdot && !strcasecmp(hostdot, argdot)) 402 *argdot = '\0'; 403 } 404 405 /* 406 * ttyconv -- 407 * convert tty to correct name. 408 */ 409 char * 410 ttyconv(arg) 411 char *arg; 412 { 413 char *mval; 414 415 /* 416 * kludge -- we assume that all tty's end with 417 * a two character suffix. 418 */ 419 if (strlen(arg) == 2) { 420 /* either 6 for "ttyxx" or 8 for "console" */ 421 if (!(mval = malloc((u_int)8))) 422 err(1, "malloc failure"); 423 if (!strcmp(arg, "co")) 424 (void)strcpy(mval, "console"); 425 else { 426 (void)strcpy(mval, "tty"); 427 (void)strcpy(mval + 3, arg); 428 } 429 return (mval); 430 } 431 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 432 return (arg + 5); 433 return (arg); 434 } 435 436 /* 437 * onintr -- 438 * on interrupt, we inform the user how far we've gotten 439 */ 440 void 441 onintr(signo) 442 int signo; 443 { 444 char ct[80]; 445 struct tm *tm; 446 447 tm = localtime(&buf[0].ut_time); 448 (void) strftime(ct, sizeof(ct), "%c", tm); 449 printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 450 if (signo == SIGINT) 451 exit(1); 452 (void)fflush(stdout); /* fix required for rsh */ 453 } 454