last.c revision 1.10
1 /* $NetBSD: last.c,v 1.10 1998/07/06 06:51:08 mrg 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 1.10 1998/07/06 06:51:08 mrg 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 extern int optind; 107 extern char *optarg; 108 int ch; 109 char *p; 110 111 maxrec = -1; 112 while ((ch = getopt(argc, argv, "0123456789f:h:t:T")) != -1) 113 switch (ch) { 114 case '0': case '1': case '2': case '3': case '4': 115 case '5': case '6': case '7': case '8': case '9': 116 /* 117 * kludge: last was originally designed to take 118 * a number after a dash. 119 */ 120 if (maxrec == -1) { 121 p = argv[optind - 1]; 122 if (p[0] == '-' && p[1] == ch && !p[2]) 123 maxrec = atol(++p); 124 else 125 maxrec = atol(argv[optind] + 1); 126 if (!maxrec) 127 exit(0); 128 } 129 break; 130 case 'f': 131 file = optarg; 132 break; 133 case 'h': 134 hostconv(optarg); 135 addarg(HOST_TYPE, optarg); 136 break; 137 case 't': 138 addarg(TTY_TYPE, ttyconv(optarg)); 139 break; 140 case 'T': 141 fulltime = 1; 142 break; 143 case '?': 144 default: 145 (void)fprintf(stderr, 146 "usage: last [-#] [-f file] [-t tty] [-h hostname] [-T] [user ...]\n"); 147 exit(1); 148 } 149 150 if (argc) { 151 setlinebuf(stdout); 152 for (argv += optind; *argv; ++argv) { 153 #define COMPATIBILITY 154 #ifdef COMPATIBILITY 155 /* code to allow "last p5" to work */ 156 addarg(TTY_TYPE, ttyconv(*argv)); 157 #endif 158 addarg(USER_TYPE, *argv); 159 } 160 } 161 wtmp(); 162 exit(0); 163 } 164 165 /* 166 * wtmp -- 167 * read through the wtmp file 168 */ 169 void 170 wtmp() 171 { 172 struct utmp *bp; /* current structure */ 173 TTY *T; /* tty list entry */ 174 struct stat stb; /* stat of file for size */ 175 time_t delta; /* time difference */ 176 off_t bl; 177 int timesize; /* how much of time string to print */ 178 int bytes, wfd; 179 char *ct, *crmsg; 180 181 crmsg = NULL; 182 183 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 184 err(1, "%s", file); 185 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 186 187 if (fulltime) 188 timesize = 8; /* HH:MM:SS */ 189 else 190 timesize = 5; /* HH:MM */ 191 192 (void)time(&buf[0].ut_time); 193 (void)signal(SIGINT, onintr); 194 (void)signal(SIGQUIT, onintr); 195 196 while (--bl >= 0) { 197 if (lseek(wfd, bl * sizeof(buf), SEEK_SET) == -1 || 198 (bytes = read(wfd, buf, sizeof(buf))) == -1) 199 err(1, "%s", file); 200 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 201 /* 202 * if the terminal line is '~', the machine stopped. 203 * see utmp(5) for more info. 204 */ 205 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 206 /* everybody just logged out */ 207 for (T = ttylist; T; T = T->next) 208 T->logout = -bp->ut_time; 209 currentout = -bp->ut_time; 210 crmsg = strncmp(bp->ut_name, "shutdown", 211 UT_NAMESIZE) ? "crash" : "shutdown"; 212 if (want(bp, NO)) { 213 ct = ctime(&bp->ut_time); 214 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s \n", 215 UT_NAMESIZE, UT_NAMESIZE, 216 bp->ut_name, UT_LINESIZE, 217 UT_LINESIZE, bp->ut_line, 218 UT_HOSTSIZE, UT_HOSTSIZE, 219 bp->ut_host, ct, timesize, 220 timesize, ct + 11); 221 if (maxrec != -1 && !--maxrec) 222 return; 223 } 224 continue; 225 } 226 /* 227 * if the line is '{' or '|', date got set; see 228 * utmp(5) for more info. 229 */ 230 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 231 && !bp->ut_line[1]) { 232 if (want(bp, NO)) { 233 ct = ctime(&bp->ut_time); 234 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s \n", 235 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 236 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 237 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 238 ct, timesize, timesize, ct + 11); 239 if (maxrec && !--maxrec) 240 return; 241 } 242 continue; 243 } 244 /* find associated tty */ 245 for (T = ttylist;; T = T->next) { 246 if (!T) { 247 /* add new one */ 248 T = addtty(bp->ut_line); 249 break; 250 } 251 if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 252 break; 253 } 254 if (bp->ut_name[0] && want(bp, YES)) { 255 ct = ctime(&bp->ut_time); 256 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s ", 257 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 258 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 259 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 260 ct, timesize, timesize, ct + 11); 261 if (!T->logout) 262 puts(" still logged in"); 263 else { 264 if (T->logout < 0) { 265 T->logout = -T->logout; 266 printf("- %s", crmsg); 267 } 268 else 269 printf("- %*.*s", 270 timesize, timesize, 271 ctime(&T->logout)+11); 272 delta = T->logout - bp->ut_time; 273 if (delta < SECSPERDAY) 274 printf(" (%*.*s)\n", 275 timesize, timesize, 276 asctime(gmtime(&delta))+11); 277 else 278 printf(" (%ld+%*.*s)\n", 279 delta / SECSPERDAY, 280 timesize, timesize, 281 asctime(gmtime(&delta))+11); 282 } 283 if (maxrec != -1 && !--maxrec) 284 return; 285 } 286 T->logout = bp->ut_time; 287 } 288 } 289 ct = ctime(&buf[0].ut_time); 290 printf("\nwtmp begins %10.10s %*.*s \n", ct, timesize, timesize, ct + 11); 291 } 292 293 /* 294 * want -- 295 * see if want this entry 296 */ 297 int 298 want(bp, check) 299 struct utmp *bp; 300 int check; 301 { 302 ARG *step; 303 304 if (check) 305 /* 306 * when uucp and ftp log in over a network, the entry in 307 * the utmp file is the name plus their process id. See 308 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 309 */ 310 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 311 bp->ut_line[3] = '\0'; 312 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 313 bp->ut_line[4] = '\0'; 314 if (!arglist) 315 return (YES); 316 317 for (step = arglist; step; step = step->next) 318 switch(step->type) { 319 case HOST_TYPE: 320 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 321 return (YES); 322 break; 323 case TTY_TYPE: 324 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 325 return (YES); 326 break; 327 case USER_TYPE: 328 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 329 return (YES); 330 break; 331 } 332 return (NO); 333 } 334 335 /* 336 * addarg -- 337 * add an entry to a linked list of arguments 338 */ 339 void 340 addarg(type, arg) 341 int type; 342 char *arg; 343 { 344 ARG *cur; 345 346 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 347 err(1, "malloc failure"); 348 cur->next = arglist; 349 cur->type = type; 350 cur->name = arg; 351 arglist = cur; 352 } 353 354 /* 355 * addtty -- 356 * add an entry to a linked list of ttys 357 */ 358 TTY * 359 addtty(ttyname) 360 char *ttyname; 361 { 362 TTY *cur; 363 364 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 365 err(1, "malloc failure"); 366 cur->next = ttylist; 367 cur->logout = currentout; 368 memmove(cur->tty, ttyname, UT_LINESIZE); 369 return (ttylist = cur); 370 } 371 372 /* 373 * hostconv -- 374 * convert the hostname to search pattern; if the supplied host name 375 * has a domain attached that is the same as the current domain, rip 376 * off the domain suffix since that's what login(1) does. 377 */ 378 void 379 hostconv(arg) 380 char *arg; 381 { 382 static int first = 1; 383 static char *hostdot, name[MAXHOSTNAMELEN + 1]; 384 char *argdot; 385 386 if (!(argdot = strchr(arg, '.'))) 387 return; 388 if (first) { 389 first = 0; 390 if (gethostname(name, sizeof(name))) 391 err(1, "gethostname"); 392 name[sizeof(name) - 1] = '\0'; 393 hostdot = strchr(name, '.'); 394 } 395 if (hostdot && !strcasecmp(hostdot, argdot)) 396 *argdot = '\0'; 397 } 398 399 /* 400 * ttyconv -- 401 * convert tty to correct name. 402 */ 403 char * 404 ttyconv(arg) 405 char *arg; 406 { 407 char *mval; 408 409 /* 410 * kludge -- we assume that all tty's end with 411 * a two character suffix. 412 */ 413 if (strlen(arg) == 2) { 414 /* either 6 for "ttyxx" or 8 for "console" */ 415 if (!(mval = malloc((u_int)8))) 416 err(1, "malloc failure"); 417 if (!strcmp(arg, "co")) 418 (void)strcpy(mval, "console"); 419 else { 420 (void)strcpy(mval, "tty"); 421 (void)strcpy(mval + 3, arg); 422 } 423 return (mval); 424 } 425 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 426 return (arg + 5); 427 return (arg); 428 } 429 430 /* 431 * onintr -- 432 * on interrupt, we inform the user how far we've gotten 433 */ 434 void 435 onintr(signo) 436 int signo; 437 { 438 char *ct; 439 440 ct = ctime(&buf[0].ut_time); 441 printf("\ninterrupted %10.10s %8.8s \n", ct, ct + 11); 442 if (signo == SIGINT) 443 exit(1); 444 (void)fflush(stdout); /* fix required for rsh */ 445 } 446
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