last.c revision 1.13
1 /* $NetBSD: last.c,v 1.13 2000/04/14 06:11:08 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 1.13 2000/04/14 06:11:08 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 static struct utmp buf[1024]; /* utmp read buffer */ 69 70 typedef struct arg { 71 char *name; /* argument */ 72 #define HOST_TYPE -2 73 #define TTY_TYPE -3 74 #define USER_TYPE -4 75 int type; /* type of arg */ 76 struct arg *next; /* linked list pointer */ 77 } ARG; 78 ARG *arglist; /* head of linked list */ 79 80 typedef struct ttytab { 81 time_t logout; /* log out time */ 82 char tty[UT_LINESIZE + 1]; /* terminal name */ 83 struct ttytab *next; /* linked list pointer */ 84 } TTY; 85 TTY *ttylist; /* head of linked list */ 86 87 static time_t currentout; /* current logout value */ 88 static long maxrec; /* records to display */ 89 static char *file = _PATH_WTMP; /* wtmp file */ 90 static int fulltime = 0; /* Display seconds? */ 91 92 int main __P((int, char *[])); 93 void addarg __P((int, char *)); 94 TTY *addtty __P((char *)); 95 void hostconv __P((char *)); 96 void onintr __P((int)); 97 char *ttyconv __P((char *)); 98 int want __P((struct utmp *, int)); 99 void wtmp __P((void)); 100 101 int 102 main(argc, argv) 103 int argc; 104 char *argv[]; 105 { 106 int ch; 107 char *p; 108 109 maxrec = -1; 110 while ((ch = getopt(argc, argv, "0123456789f:h:t:T")) != -1) 111 switch (ch) { 112 case '0': case '1': case '2': case '3': case '4': 113 case '5': case '6': case '7': case '8': case '9': 114 /* 115 * kludge: last was originally designed to take 116 * a number after a dash. 117 */ 118 if (maxrec == -1) { 119 p = argv[optind - 1]; 120 if (p[0] == '-' && p[1] == ch && !p[2]) 121 maxrec = atol(++p); 122 else 123 maxrec = atol(argv[optind] + 1); 124 if (!maxrec) 125 exit(0); 126 } 127 break; 128 case 'f': 129 file = optarg; 130 break; 131 case 'h': 132 hostconv(optarg); 133 addarg(HOST_TYPE, optarg); 134 break; 135 case 't': 136 addarg(TTY_TYPE, ttyconv(optarg)); 137 break; 138 case 'T': 139 fulltime = 1; 140 break; 141 case '?': 142 default: 143 (void)fprintf(stderr, 144 "usage: last [-#] [-f file] [-t tty] [-h hostname] [-T] [user ...]\n"); 145 exit(1); 146 } 147 148 if (argc) { 149 setlinebuf(stdout); 150 for (argv += optind; *argv; ++argv) { 151 #define COMPATIBILITY 152 #ifdef COMPATIBILITY 153 /* code to allow "last p5" to work */ 154 addarg(TTY_TYPE, ttyconv(*argv)); 155 #endif 156 addarg(USER_TYPE, *argv); 157 } 158 } 159 wtmp(); 160 exit(0); 161 } 162 163 /* 164 * wtmp -- 165 * read through the wtmp file 166 */ 167 void 168 wtmp() 169 { 170 struct utmp *bp; /* current structure */ 171 TTY *T; /* tty list entry */ 172 struct stat stb; /* stat of file for size */ 173 time_t delta; /* time difference */ 174 off_t bl; 175 int timesize; /* how much of time string to print */ 176 int bytes, wfd; 177 char *ct, *crmsg; 178 179 crmsg = NULL; 180 181 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 182 err(1, "%s", file); 183 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 184 185 if (fulltime) 186 timesize = 8; /* HH:MM:SS */ 187 else 188 timesize = 5; /* HH:MM */ 189 190 (void)time(&buf[0].ut_time); 191 (void)signal(SIGINT, onintr); 192 (void)signal(SIGQUIT, onintr); 193 194 while (--bl >= 0) { 195 if (lseek(wfd, bl * sizeof(buf), SEEK_SET) == -1 || 196 (bytes = read(wfd, buf, sizeof(buf))) == -1) 197 err(1, "%s", file); 198 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 199 /* 200 * if the terminal line is '~', the machine stopped. 201 * see utmp(5) for more info. 202 */ 203 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 204 /* everybody just logged out */ 205 for (T = ttylist; T; T = T->next) 206 T->logout = -bp->ut_time; 207 currentout = -bp->ut_time; 208 crmsg = strncmp(bp->ut_name, "shutdown", 209 UT_NAMESIZE) ? "crash" : "shutdown"; 210 if (want(bp, NO)) { 211 ct = ctime(&bp->ut_time); 212 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s \n", 213 (int)UT_NAMESIZE, (int)UT_NAMESIZE, 214 bp->ut_name, (int)UT_LINESIZE, 215 (int)UT_LINESIZE, bp->ut_line, 216 (int)UT_HOSTSIZE, (int)UT_HOSTSIZE, 217 bp->ut_host, ct, timesize, 218 timesize, ct + 11); 219 if (maxrec != -1 && !--maxrec) 220 return; 221 } 222 continue; 223 } 224 /* 225 * if the line is '{' or '|', date got set; see 226 * utmp(5) for more info. 227 */ 228 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 229 && !bp->ut_line[1]) { 230 if (want(bp, NO)) { 231 ct = ctime(&bp->ut_time); 232 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s \n", 233 (int)UT_NAMESIZE, (int)UT_NAMESIZE, 234 bp->ut_name, 235 (int)UT_LINESIZE, (int)UT_LINESIZE, 236 bp->ut_line, 237 (int)UT_HOSTSIZE, (int)UT_HOSTSIZE, 238 bp->ut_host, 239 ct, timesize, timesize, ct + 11); 240 if (maxrec && !--maxrec) 241 return; 242 } 243 continue; 244 } 245 /* find associated tty */ 246 for (T = ttylist;; T = T->next) { 247 if (!T) { 248 /* add new one */ 249 T = addtty(bp->ut_line); 250 break; 251 } 252 if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 253 break; 254 } 255 if (bp->ut_name[0] && want(bp, YES)) { 256 ct = ctime(&bp->ut_time); 257 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s ", 258 (int)UT_NAMESIZE, (int)UT_NAMESIZE, bp->ut_name, 259 (int)UT_LINESIZE, (int)UT_LINESIZE, bp->ut_line, 260 (int)UT_HOSTSIZE, (int)UT_HOSTSIZE, bp->ut_host, 261 ct, timesize, timesize, ct + 11); 262 if (!T->logout) 263 puts(" still logged in"); 264 else { 265 if (T->logout < 0) { 266 T->logout = -T->logout; 267 printf("- %s", crmsg); 268 } 269 else 270 printf("- %*.*s", 271 timesize, timesize, 272 ctime(&T->logout)+11); 273 delta = T->logout - bp->ut_time; 274 if (delta < SECSPERDAY) 275 printf(" (%*.*s)\n", 276 timesize, timesize, 277 asctime(gmtime(&delta))+11); 278 else 279 printf(" (%ld+%*.*s)\n", 280 delta / SECSPERDAY, 281 timesize, timesize, 282 asctime(gmtime(&delta))+11); 283 } 284 if (maxrec != -1 && !--maxrec) 285 return; 286 } 287 T->logout = bp->ut_time; 288 } 289 } 290 ct = ctime(&buf[0].ut_time); 291 printf("\nwtmp begins %10.10s %*.*s \n", ct, timesize, timesize, ct + 11); 292 } 293 294 /* 295 * want -- 296 * see if want this entry 297 */ 298 int 299 want(bp, check) 300 struct utmp *bp; 301 int check; 302 { 303 ARG *step; 304 305 if (check) { 306 /* 307 * when uucp and ftp log in over a network, the entry in 308 * the utmp file is the name plus their process id. See 309 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 310 */ 311 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 312 bp->ut_line[3] = '\0'; 313 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 314 bp->ut_line[4] = '\0'; 315 } 316 if (!arglist) 317 return (YES); 318 319 for (step = arglist; step; step = step->next) 320 switch(step->type) { 321 case HOST_TYPE: 322 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 323 return (YES); 324 break; 325 case TTY_TYPE: 326 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 327 return (YES); 328 break; 329 case USER_TYPE: 330 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 331 return (YES); 332 break; 333 } 334 return (NO); 335 } 336 337 /* 338 * addarg -- 339 * add an entry to a linked list of arguments 340 */ 341 void 342 addarg(type, arg) 343 int type; 344 char *arg; 345 { 346 ARG *cur; 347 348 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 349 err(1, "malloc failure"); 350 cur->next = arglist; 351 cur->type = type; 352 cur->name = arg; 353 arglist = cur; 354 } 355 356 /* 357 * addtty -- 358 * add an entry to a linked list of ttys 359 */ 360 TTY * 361 addtty(ttyname) 362 char *ttyname; 363 { 364 TTY *cur; 365 366 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 367 err(1, "malloc failure"); 368 cur->next = ttylist; 369 cur->logout = currentout; 370 memmove(cur->tty, ttyname, UT_LINESIZE); 371 return (ttylist = cur); 372 } 373 374 /* 375 * hostconv -- 376 * convert the hostname to search pattern; if the supplied host name 377 * has a domain attached that is the same as the current domain, rip 378 * off the domain suffix since that's what login(1) does. 379 */ 380 void 381 hostconv(arg) 382 char *arg; 383 { 384 static int first = 1; 385 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 386 char *argdot; 387 388 if (!(argdot = strchr(arg, '.'))) 389 return; 390 if (first) { 391 first = 0; 392 if (gethostname(name, sizeof(name))) 393 err(1, "gethostname"); 394 name[sizeof(name) - 1] = '\0'; 395 hostdot = strchr(name, '.'); 396 } 397 if (hostdot && !strcasecmp(hostdot, argdot)) 398 *argdot = '\0'; 399 } 400 401 /* 402 * ttyconv -- 403 * convert tty to correct name. 404 */ 405 char * 406 ttyconv(arg) 407 char *arg; 408 { 409 char *mval; 410 411 /* 412 * kludge -- we assume that all tty's end with 413 * a two character suffix. 414 */ 415 if (strlen(arg) == 2) { 416 /* either 6 for "ttyxx" or 8 for "console" */ 417 if (!(mval = malloc((u_int)8))) 418 err(1, "malloc failure"); 419 if (!strcmp(arg, "co")) 420 (void)strcpy(mval, "console"); 421 else { 422 (void)strcpy(mval, "tty"); 423 (void)strcpy(mval + 3, arg); 424 } 425 return (mval); 426 } 427 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 428 return (arg + 5); 429 return (arg); 430 } 431 432 /* 433 * onintr -- 434 * on interrupt, we inform the user how far we've gotten 435 */ 436 void 437 onintr(signo) 438 int signo; 439 { 440 char *ct; 441 442 ct = ctime(&buf[0].ut_time); 443 printf("\ninterrupted %10.10s %8.8s \n", ct, ct + 11); 444 if (signo == SIGINT) 445 exit(1); 446 (void)fflush(stdout); /* fix required for rsh */ 447 } 448
Indexes created Thu Oct 30 03:10:01 GMT 2025