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 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1987, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/stat.h> 46 47 #include <err.h> 48 #include <fcntl.h> 49 #include <locale.h> 50 #include <paths.h> 51 #include <signal.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <time.h> 56 #include <unistd.h> 57 #include <utmp.h> 58 #include <sys/queue.h> 59 60 #define NO 0 /* false/no */ 61 #define YES 1 /* true/yes */ 62 63 static struct utmp buf[1024]; /* utmp read buffer */ 64 65 typedef struct arg { 66 char *name; /* argument */ 67 #define HOST_TYPE -2 68 #define TTY_TYPE -3 69 #define USER_TYPE -4 70 int type; /* type of arg */ 71 struct arg *next; /* linked list pointer */ 72 } ARG; 73 ARG *arglist; /* head of linked list */ 74 75 LIST_HEAD(ttylisthead, ttytab) ttylist; 76 77 struct ttytab { 78 time_t logout; /* log out time */ 79 char tty[UT_LINESIZE + 1]; /* terminal name */ 80 LIST_ENTRY(ttytab) list; 81 }; 82 83 static long currentout, /* current logout value */ 84 maxrec; /* records to display */ 85 static char *file = _PATH_WTMP; /* wtmp file */ 86 static int sflag = 0; /* show delta in seconds */ 87 static int width = 5; /* show seconds in delta */ 88 89 void addarg __P((int, char *)); 90 void hostconv __P((char *)); 91 void onintr __P((int)); 92 char *ttyconv __P((char *)); 93 int want __P((struct utmp *)); 94 void wtmp __P((void)); 95 96 void 97 usage(void) 98 { 99 (void)fprintf(stderr, 100 "usage: last [-#] [-f file] [-h hostname] [-t tty] [-s|w] [user ...]\n"); 101 exit(1); 102 } 103 104 int 105 main(argc, argv) 106 int argc; 107 char *argv[]; 108 { 109 extern int optind; 110 extern char *optarg; 111 int ch; 112 char *p; 113 114 (void) setlocale(LC_TIME, ""); 115 116 maxrec = -1; 117 while ((ch = getopt(argc, argv, "0123456789f:h:st:w")) != -1) 118 switch (ch) { 119 case '0': case '1': case '2': case '3': case '4': 120 case '5': case '6': case '7': case '8': case '9': 121 /* 122 * kludge: last was originally designed to take 123 * a number after a dash. 124 */ 125 if (maxrec == -1) { 126 p = argv[optind - 1]; 127 if (p[0] == '-' && p[1] == ch && !p[2]) 128 maxrec = atol(++p); 129 else 130 maxrec = atol(argv[optind] + 1); 131 if (!maxrec) 132 exit(0); 133 } 134 break; 135 case 'f': 136 file = optarg; 137 break; 138 case 'h': 139 hostconv(optarg); 140 addarg(HOST_TYPE, optarg); 141 break; 142 case 's': 143 sflag++; /* Show delta as seconds */ 144 break; 145 case 't': 146 addarg(TTY_TYPE, ttyconv(optarg)); 147 break; 148 case 'w': 149 width = 8; 150 break; 151 case '?': 152 default: 153 usage(); 154 } 155 156 if (sflag && width == 8) usage(); 157 158 if (argc) { 159 setlinebuf(stdout); 160 for (argv += optind; *argv; ++argv) { 161 #define COMPATIBILITY 162 #ifdef COMPATIBILITY 163 /* code to allow "last p5" to work */ 164 addarg(TTY_TYPE, ttyconv(*argv)); 165 #endif 166 addarg(USER_TYPE, *argv); 167 } 168 } 169 wtmp(); 170 exit(0); 171 } 172 173 /* 174 * wtmp -- 175 * read through the wtmp file 176 */ 177 void 178 wtmp() 179 { 180 struct utmp *bp; /* current structure */ 181 struct ttytab *tt, *ttx; /* ttylist entry */ 182 struct stat stb; /* stat of file for size */ 183 long bl; 184 time_t delta; /* time difference */ 185 int bytes, wfd; 186 char *crmsg; 187 char ct[80]; 188 struct tm *tm; 189 190 LIST_INIT(&ttylist); 191 192 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 193 err(1, "%s", file); 194 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 195 196 (void)time(&buf[0].ut_time); 197 (void)signal(SIGINT, onintr); 198 (void)signal(SIGQUIT, onintr); 199 200 while (--bl >= 0) { 201 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 202 (bytes = read(wfd, buf, sizeof(buf))) == -1) 203 err(1, "%s", file); 204 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 205 /* 206 * if the terminal line is '~', the machine stopped. 207 * see utmp(5) for more info. 208 */ 209 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 210 /* everybody just logged out */ 211 for (tt = ttylist.lh_first; tt;) { 212 LIST_REMOVE(tt, list); 213 ttx = tt; 214 tt = tt->list.le_next; 215 free(ttx); 216 } 217 currentout = -bp->ut_time; 218 crmsg = strncmp(bp->ut_name, "shutdown", 219 UT_NAMESIZE) ? "crash" : "shutdown"; 220 if (want(bp)) { 221 tm = localtime(&bp->ut_time); 222 (void) strftime(ct, sizeof(ct), "%c", tm); 223 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 224 UT_NAMESIZE, UT_NAMESIZE, 225 bp->ut_name, UT_LINESIZE, 226 UT_LINESIZE, bp->ut_line, 227 UT_HOSTSIZE, UT_HOSTSIZE, 228 bp->ut_host, ct, ct + 11); 229 if (maxrec != -1 && !--maxrec) 230 return; 231 } 232 continue; 233 } 234 /* 235 * if the line is '{' or '|', date got set; see 236 * utmp(5) for more info. 237 */ 238 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 239 && !bp->ut_line[1]) { 240 if (want(bp)) { 241 tm = localtime(&bp->ut_time); 242 (void) strftime(ct, sizeof(ct), "%c", tm); 243 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 244 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 245 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 246 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 247 ct, ct + 11); 248 if (maxrec && !--maxrec) 249 return; 250 } 251 continue; 252 } 253 if (bp->ut_name[0] == '\0' || want(bp)) { 254 /* find associated tty */ 255 for (tt = ttylist.lh_first; ; tt = tt->list.le_next) { 256 if (tt == NULL) { 257 /* add new one */ 258 tt = malloc(sizeof(struct ttytab)); 259 if (tt == NULL) 260 err(1, "malloc failure"); 261 tt->logout = currentout; 262 strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 263 LIST_INSERT_HEAD(&ttylist, tt, list); 264 break; 265 } 266 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 267 break; 268 } 269 if (bp->ut_name[0]) { 270 /* 271 * when uucp and ftp log in over a network, the entry in 272 * the utmp file is the name plus their process id. See 273 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 274 */ 275 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 276 bp->ut_line[3] = '\0'; 277 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 278 bp->ut_line[4] = '\0'; 279 tm = localtime(&bp->ut_time); 280 (void) strftime(ct, sizeof(ct), "%c", tm); 281 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 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, ct + 11); 286 if (!tt->logout) 287 puts(" still logged in"); 288 else { 289 if (tt->logout < 0) { 290 tt->logout = -tt->logout; 291 printf("- %s", crmsg); 292 } 293 else { 294 tm = localtime(&tt->logout); 295 (void) strftime(ct, sizeof(ct), "%c", tm); 296 printf("- %5.5s", ct + 11); 297 } 298 delta = tt->logout - bp->ut_time; 299 if ( sflag ) { 300 printf(" (%8lu)\n", 301 delta); 302 } else { 303 tm = gmtime(&delta); 304 (void) strftime(ct, sizeof(ct), "%c", tm); 305 if (delta < 86400) 306 printf(" (%*.*s)\n", width, width, ct + 11); 307 else 308 printf(" (%ld+%*.*s)\n", 309 delta / 86400, width, width, ct + 11); 310 } 311 } 312 LIST_REMOVE(tt, list); 313 free(tt); 314 if (maxrec != -1 && !--maxrec) 315 return; 316 } else { 317 tt->logout = bp->ut_time; 318 } 319 } 320 } 321 } 322 tm = localtime(&buf[0].ut_time); 323 (void) strftime(ct, sizeof(ct), "\nwtmp begins %c\n", tm); 324 printf(ct); 325 } 326 327 /* 328 * want -- 329 * see if want this entry 330 */ 331 int 332 want(bp) 333 struct utmp *bp; 334 { 335 ARG *step; 336 337 if (!arglist) 338 return (YES); 339 340 for (step = arglist; step; step = step->next) 341 switch(step->type) { 342 case HOST_TYPE: 343 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 344 return (YES); 345 break; 346 case TTY_TYPE: 347 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 348 return (YES); 349 break; 350 case USER_TYPE: 351 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 352 return (YES); 353 break; 354 } 355 return (NO); 356 } 357 358 /* 359 * addarg -- 360 * add an entry to a linked list of arguments 361 */ 362 void 363 addarg(type, arg) 364 int type; 365 char *arg; 366 { 367 ARG *cur; 368 369 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 370 err(1, "malloc failure"); 371 cur->next = arglist; 372 cur->type = type; 373 cur->name = arg; 374 arglist = cur; 375 } 376 377 /* 378 * hostconv -- 379 * convert the hostname to search pattern; if the supplied host name 380 * has a domain attached that is the same as the current domain, rip 381 * off the domain suffix since that's what login(1) does. 382 */ 383 void 384 hostconv(arg) 385 char *arg; 386 { 387 static int first = 1; 388 static char *hostdot, name[MAXHOSTNAMELEN]; 389 char *argdot; 390 391 if (!(argdot = strchr(arg, '.'))) 392 return; 393 if (first) { 394 first = 0; 395 if (gethostname(name, sizeof(name))) 396 err(1, "gethostname"); 397 hostdot = strchr(name, '.'); 398 } 399 if (hostdot && !strcasecmp(hostdot, argdot)) 400 *argdot = '\0'; 401 } 402 403 /* 404 * ttyconv -- 405 * convert tty to correct name. 406 */ 407 char * 408 ttyconv(arg) 409 char *arg; 410 { 411 char *mval; 412 413 /* 414 * kludge -- we assume that all tty's end with 415 * a two character suffix. 416 */ 417 if (strlen(arg) == 2) { 418 /* either 6 for "ttyxx" or 8 for "console" */ 419 if (!(mval = malloc((u_int)8))) 420 err(1, "malloc failure"); 421 if (!strcmp(arg, "co")) 422 (void)strcpy(mval, "console"); 423 else { 424 (void)strcpy(mval, "tty"); 425 (void)strcpy(mval + 3, arg); 426 } 427 return (mval); 428 } 429 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 430 return (arg + 5); 431 return (arg); 432 } 433 434 /* 435 * onintr -- 436 * on interrupt, we inform the user how far we've gotten 437 */ 438 void 439 onintr(signo) 440 int signo; 441 { 442 char ct[80]; 443 struct tm *tm; 444 445 tm = localtime(&buf[0].ut_time); 446 (void) strftime(ct, sizeof(ct), "%c", tm); 447 printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 448 if (signo == SIGINT) 449 exit(1); 450 (void)fflush(stdout); /* fix required for rsh */ 451 } 452