last.c revision 1.14
1 /* $NetBSD: last.c,v 1.14 2000/06/25 13:44:43 simonb Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT( 39 "@(#) Copyright (c) 1987, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 46 #endif 47 __RCSID("$NetBSD: last.c,v 1.14 2000/06/25 13:44:43 simonb Exp $"); 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <fcntl.h> 55 #include <paths.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <time.h> 61 #include <tzfile.h> 62 #include <unistd.h> 63 #include <utmp.h> 64 65 #define NO 0 /* false/no */ 66 #define YES 1 /* true/yes */ 67 68 #define TBUFLEN 30 /* length of time string buffer */ 69 #define TFMT "%a %b %R" /* strftime format string */ 70 #define LTFMT "%a %b %Y %T" /* strftime long format string */ 71 #define TFMTS "%R" /* strftime format string - time only */ 72 #define LTFMTS "%T" /* strftime long format string - " */ 73 74 /* fmttime() flags */ 75 #define FULLTIME 0x1 /* show year, seconds */ 76 #define TIMEONLY 0x2 /* show time only, not date */ 77 #define GMT 0x4 /* show time at GMT, for offsets only */ 78 79 static struct utmp buf[1024]; /* utmp read buffer */ 80 81 typedef struct arg { 82 char *name; /* argument */ 83 #define HOST_TYPE -2 84 #define TTY_TYPE -3 85 #define USER_TYPE -4 86 int type; /* type of arg */ 87 struct arg *next; /* linked list pointer */ 88 } ARG; 89 ARG *arglist; /* head of linked list */ 90 91 typedef struct ttytab { 92 time_t logout; /* log out time */ 93 char tty[UT_LINESIZE + 1]; /* terminal name */ 94 struct ttytab *next; /* linked list pointer */ 95 } TTY; 96 TTY *ttylist; /* head of linked list */ 97 98 static time_t currentout; /* current logout value */ 99 static long maxrec; /* records to display */ 100 static char *file = _PATH_WTMP; /* wtmp file */ 101 static int fulltime = 0; /* Display seconds? */ 102 103 int main __P((int, char *[])); 104 void addarg __P((int, char *)); 105 TTY *addtty __P((char *)); 106 void hostconv __P((char *)); 107 void onintr __P((int)); 108 char *ttyconv __P((char *)); 109 int want __P((struct utmp *, int)); 110 void wtmp __P((void)); 111 char *fmttime __P((time_t, int)); 112 113 int 114 main(argc, argv) 115 int argc; 116 char *argv[]; 117 { 118 int ch; 119 char *p; 120 121 maxrec = -1; 122 while ((ch = getopt(argc, argv, "0123456789f:h:t:T")) != -1) 123 switch (ch) { 124 case '0': case '1': case '2': case '3': case '4': 125 case '5': case '6': case '7': case '8': case '9': 126 /* 127 * kludge: last was originally designed to take 128 * a number after a dash. 129 */ 130 if (maxrec == -1) { 131 p = argv[optind - 1]; 132 if (p[0] == '-' && p[1] == ch && !p[2]) 133 maxrec = atol(++p); 134 else 135 maxrec = atol(argv[optind] + 1); 136 if (!maxrec) 137 exit(0); 138 } 139 break; 140 case 'f': 141 file = optarg; 142 break; 143 case 'h': 144 hostconv(optarg); 145 addarg(HOST_TYPE, optarg); 146 break; 147 case 't': 148 addarg(TTY_TYPE, ttyconv(optarg)); 149 break; 150 case 'T': 151 fulltime = 1; 152 break; 153 case '?': 154 default: 155 (void)fprintf(stderr, 156 "usage: last [-#] [-f file] [-t tty] [-h hostname] [-T] [user ...]\n"); 157 exit(1); 158 } 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 TTY *T; /* tty list entry */ 184 struct stat stb; /* stat of file for size */ 185 time_t delta; /* time difference */ 186 off_t bl; 187 int bytes, wfd; 188 char *ct, *crmsg; 189 190 crmsg = NULL; 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, bl * sizeof(buf), SEEK_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 (T = ttylist; T; T = T->next) 212 T->logout = -bp->ut_time; 213 currentout = -bp->ut_time; 214 crmsg = strncmp(bp->ut_name, "shutdown", 215 UT_NAMESIZE) ? "crash" : "shutdown"; 216 if (want(bp, NO)) { 217 ct = fmttime(bp->ut_time, fulltime); 218 printf("%-*.*s %-*.*s %-*.*s %s\n", 219 (int)UT_NAMESIZE, (int)UT_NAMESIZE, 220 bp->ut_name, (int)UT_LINESIZE, 221 (int)UT_LINESIZE, bp->ut_line, 222 (int)UT_HOSTSIZE, (int)UT_HOSTSIZE, 223 bp->ut_host, ct); 224 if (maxrec != -1 && !--maxrec) 225 return; 226 } 227 continue; 228 } 229 /* 230 * if the line is '{' or '|', date got set; see 231 * utmp(5) for more info. 232 */ 233 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 234 && !bp->ut_line[1]) { 235 if (want(bp, NO)) { 236 ct = fmttime(bp->ut_time, fulltime); 237 printf("%-*.*s %-*.*s %-*.*s %s\n", 238 (int)UT_NAMESIZE, (int)UT_NAMESIZE, 239 bp->ut_name, 240 (int)UT_LINESIZE, (int)UT_LINESIZE, 241 bp->ut_line, 242 (int)UT_HOSTSIZE, (int)UT_HOSTSIZE, 243 bp->ut_host, 244 ct); 245 if (maxrec && !--maxrec) 246 return; 247 } 248 continue; 249 } 250 /* find associated tty */ 251 for (T = ttylist;; T = T->next) { 252 if (!T) { 253 /* add new one */ 254 T = addtty(bp->ut_line); 255 break; 256 } 257 if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 258 break; 259 } 260 if (bp->ut_name[0] && want(bp, YES)) { 261 ct = fmttime(bp->ut_time, fulltime); 262 printf("%-*.*s %-*.*s %-*.*s %s ", 263 (int)UT_NAMESIZE, (int)UT_NAMESIZE, bp->ut_name, 264 (int)UT_LINESIZE, (int)UT_LINESIZE, bp->ut_line, 265 (int)UT_HOSTSIZE, (int)UT_HOSTSIZE, bp->ut_host, 266 ct); 267 if (!T->logout) 268 puts(" still logged in"); 269 else { 270 if (T->logout < 0) { 271 T->logout = -T->logout; 272 printf("- %s", crmsg); 273 } 274 else 275 printf("- %s", 276 fmttime(T->logout, 277 fulltime | TIMEONLY)); 278 delta = T->logout - bp->ut_time; 279 if (delta < SECSPERDAY) 280 printf(" (%s)\n", 281 fmttime(delta, 282 fulltime | TIMEONLY | GMT)); 283 else 284 printf(" (%ld+%s)\n", 285 delta / SECSPERDAY, 286 fmttime(delta, 287 fulltime | TIMEONLY | GMT)); 288 } 289 if (maxrec != -1 && !--maxrec) 290 return; 291 } 292 T->logout = bp->ut_time; 293 } 294 } 295 fulltime = 1; /* show full time */ 296 ct = fmttime(buf[0].ut_time, FULLTIME); 297 printf("\nwtmp begins %s\n", ct); 298 } 299 300 /* 301 * want -- 302 * see if want this entry 303 */ 304 int 305 want(bp, check) 306 struct utmp *bp; 307 int check; 308 { 309 ARG *step; 310 311 if (check) { 312 /* 313 * when uucp and ftp log in over a network, the entry in 314 * the utmp file is the name plus their process id. See 315 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 316 */ 317 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 318 bp->ut_line[3] = '\0'; 319 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 320 bp->ut_line[4] = '\0'; 321 } 322 if (!arglist) 323 return (YES); 324 325 for (step = arglist; step; step = step->next) 326 switch(step->type) { 327 case HOST_TYPE: 328 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 329 return (YES); 330 break; 331 case TTY_TYPE: 332 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 333 return (YES); 334 break; 335 case USER_TYPE: 336 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 337 return (YES); 338 break; 339 } 340 return (NO); 341 } 342 343 /* 344 * addarg -- 345 * add an entry to a linked list of arguments 346 */ 347 void 348 addarg(type, arg) 349 int type; 350 char *arg; 351 { 352 ARG *cur; 353 354 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 355 err(1, "malloc failure"); 356 cur->next = arglist; 357 cur->type = type; 358 cur->name = arg; 359 arglist = cur; 360 } 361 362 /* 363 * addtty -- 364 * add an entry to a linked list of ttys 365 */ 366 TTY * 367 addtty(ttyname) 368 char *ttyname; 369 { 370 TTY *cur; 371 372 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 373 err(1, "malloc failure"); 374 cur->next = ttylist; 375 cur->logout = currentout; 376 memmove(cur->tty, ttyname, UT_LINESIZE); 377 return (ttylist = cur); 378 } 379 380 /* 381 * hostconv -- 382 * convert the hostname to search pattern; if the supplied host name 383 * has a domain attached that is the same as the current domain, rip 384 * off the domain suffix since that's what login(1) does. 385 */ 386 void 387 hostconv(arg) 388 char *arg; 389 { 390 static int first = 1; 391 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 392 char *argdot; 393 394 if (!(argdot = strchr(arg, '.'))) 395 return; 396 if (first) { 397 first = 0; 398 if (gethostname(name, sizeof(name))) 399 err(1, "gethostname"); 400 name[sizeof(name) - 1] = '\0'; 401 hostdot = strchr(name, '.'); 402 } 403 if (hostdot && !strcasecmp(hostdot, argdot)) 404 *argdot = '\0'; 405 } 406 407 /* 408 * ttyconv -- 409 * convert tty to correct name. 410 */ 411 char * 412 ttyconv(arg) 413 char *arg; 414 { 415 char *mval; 416 417 /* 418 * kludge -- we assume that all tty's end with 419 * a two character suffix. 420 */ 421 if (strlen(arg) == 2) { 422 /* either 6 for "ttyxx" or 8 for "console" */ 423 if (!(mval = malloc((u_int)8))) 424 err(1, "malloc failure"); 425 if (!strcmp(arg, "co")) 426 (void)strcpy(mval, "console"); 427 else { 428 (void)strcpy(mval, "tty"); 429 (void)strcpy(mval + 3, arg); 430 } 431 return (mval); 432 } 433 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 434 return (arg + 5); 435 return (arg); 436 } 437 438 /* 439 * fmttime -- 440 * return pointer to (static) formatted time string. 441 */ 442 char * 443 fmttime(t, flags) 444 time_t t; 445 int flags; 446 { 447 struct tm *tm; 448 static char tbuf[TBUFLEN]; 449 450 tm = (flags & GMT) ? gmtime(&t) : localtime(&t); 451 strftime(tbuf, sizeof(tbuf), 452 (flags & TIMEONLY) 453 ? (flags & FULLTIME ? LTFMTS : TFMTS) 454 : (flags & FULLTIME ? LTFMT : TFMT), 455 tm); 456 return (tbuf); 457 } 458 459 /* 460 * onintr -- 461 * on interrupt, we inform the user how far we've gotten 462 */ 463 void 464 onintr(signo) 465 int signo; 466 { 467 468 printf("\ninterrupted %s\n", fmttime(buf[0].ut_time, FULLTIME)); 469 if (signo == SIGINT) 470 exit(1); 471 (void)fflush(stdout); /* fix required for rsh */ 472 } 473
Indexes created Mon Sep 29 21:09:56 GMT 2025