last.c revision 1.7
1 /* $NetBSD: last.c,v 1.7 1997/07/17 02:36:56 perry 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 #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 #if 0 44 static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94"; 45 #endif 46 static char rcsid[] = "$NetBSD: last.c,v 1.7 1997/07/17 02:36:56 perry Exp $"; 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 52 #include <err.h> 53 #include <fcntl.h> 54 #include <paths.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <time.h> 60 #include <tzfile.h> 61 #include <unistd.h> 62 #include <utmp.h> 63 64 #define NO 0 /* false/no */ 65 #define YES 1 /* true/yes */ 66 67 static struct utmp buf[1024]; /* utmp read buffer */ 68 69 typedef struct arg { 70 char *name; /* argument */ 71 #define HOST_TYPE -2 72 #define TTY_TYPE -3 73 #define USER_TYPE -4 74 int type; /* type of arg */ 75 struct arg *next; /* linked list pointer */ 76 } ARG; 77 ARG *arglist; /* head of linked list */ 78 79 typedef struct ttytab { 80 time_t logout; /* log out time */ 81 char tty[UT_LINESIZE + 1]; /* terminal name */ 82 struct ttytab *next; /* linked list pointer */ 83 } TTY; 84 TTY *ttylist; /* head of linked list */ 85 86 static time_t currentout; /* current logout value */ 87 static long maxrec; /* records to display */ 88 static char *file = _PATH_WTMP; /* wtmp file */ 89 static int fulltime = 0; /* Display seconds? */ 90 91 void addarg __P((int, char *)); 92 TTY *addtty __P((char *)); 93 void hostconv __P((char *)); 94 void onintr __P((int)); 95 char *ttyconv __P((char *)); 96 int want __P((struct utmp *, int)); 97 void wtmp __P((void)); 98 99 int 100 main(argc, argv) 101 int argc; 102 char *argv[]; 103 { 104 extern int optind; 105 extern char *optarg; 106 int ch; 107 char *p; 108 109 maxrec = -1; 110 while ((ch = getopt(argc, argv, "0123456789f:h:t:T")) != EOF) 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 bl, delta; /* time difference */ 174 int timesize; /* how much of time string to print */ 175 int bytes, wfd; 176 char *ct, *crmsg; 177 178 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 179 err(1, "%s", file); 180 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 181 182 if (fulltime) 183 timesize = 8; /* HH:MM:SS */ 184 else 185 timesize = 5; /* HH:MM */ 186 187 (void)time(&buf[0].ut_time); 188 (void)signal(SIGINT, onintr); 189 (void)signal(SIGQUIT, onintr); 190 191 while (--bl >= 0) { 192 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 193 (bytes = read(wfd, buf, sizeof(buf))) == -1) 194 err(1, "%s", file); 195 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 196 /* 197 * if the terminal line is '~', the machine stopped. 198 * see utmp(5) for more info. 199 */ 200 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 201 /* everybody just logged out */ 202 for (T = ttylist; T; T = T->next) 203 T->logout = -bp->ut_time; 204 currentout = -bp->ut_time; 205 crmsg = strncmp(bp->ut_name, "shutdown", 206 UT_NAMESIZE) ? "crash" : "shutdown"; 207 if (want(bp, NO)) { 208 ct = ctime(&bp->ut_time); 209 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s \n", 210 UT_NAMESIZE, UT_NAMESIZE, 211 bp->ut_name, UT_LINESIZE, 212 UT_LINESIZE, bp->ut_line, 213 UT_HOSTSIZE, UT_HOSTSIZE, 214 bp->ut_host, ct, timesize, 215 timesize, ct + 11); 216 if (maxrec != -1 && !--maxrec) 217 return; 218 } 219 continue; 220 } 221 /* 222 * if the line is '{' or '|', date got set; see 223 * utmp(5) for more info. 224 */ 225 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 226 && !bp->ut_line[1]) { 227 if (want(bp, NO)) { 228 ct = ctime(&bp->ut_time); 229 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s \n", 230 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 231 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 232 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 233 ct, timesize, timesize, ct + 11); 234 if (maxrec && !--maxrec) 235 return; 236 } 237 continue; 238 } 239 /* find associated tty */ 240 for (T = ttylist;; T = T->next) { 241 if (!T) { 242 /* add new one */ 243 T = addtty(bp->ut_line); 244 break; 245 } 246 if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 247 break; 248 } 249 if (bp->ut_name[0] && want(bp, YES)) { 250 ct = ctime(&bp->ut_time); 251 printf("%-*.*s %-*.*s %-*.*s %10.10s %*.*s ", 252 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 253 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 254 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 255 ct, timesize, timesize, ct + 11); 256 if (!T->logout) 257 puts(" still logged in"); 258 else { 259 if (T->logout < 0) { 260 T->logout = -T->logout; 261 printf("- %s", crmsg); 262 } 263 else 264 printf("- %*.*s", 265 timesize, timesize, 266 ctime(&T->logout)+11); 267 delta = T->logout - bp->ut_time; 268 if (delta < SECSPERDAY) 269 printf(" (%*.*s)\n", 270 timesize, timesize, 271 asctime(gmtime(&delta))+11); 272 else 273 printf(" (%ld+%*.*s)\n", 274 delta / SECSPERDAY, 275 timesize, timesize, 276 asctime(gmtime(&delta))+11); 277 } 278 if (maxrec != -1 && !--maxrec) 279 return; 280 } 281 T->logout = bp->ut_time; 282 } 283 } 284 ct = ctime(&buf[0].ut_time); 285 printf("\nwtmp begins %10.10s %*.*s \n", ct, timesize, timesize, ct + 11); 286 } 287 288 /* 289 * want -- 290 * see if want this entry 291 */ 292 int 293 want(bp, check) 294 struct utmp *bp; 295 int check; 296 { 297 ARG *step; 298 299 if (check) 300 /* 301 * when uucp and ftp log in over a network, the entry in 302 * the utmp file is the name plus their process id. See 303 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 304 */ 305 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 306 bp->ut_line[3] = '\0'; 307 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 308 bp->ut_line[4] = '\0'; 309 if (!arglist) 310 return (YES); 311 312 for (step = arglist; step; step = step->next) 313 switch(step->type) { 314 case HOST_TYPE: 315 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 316 return (YES); 317 break; 318 case TTY_TYPE: 319 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 320 return (YES); 321 break; 322 case USER_TYPE: 323 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 324 return (YES); 325 break; 326 } 327 return (NO); 328 } 329 330 /* 331 * addarg -- 332 * add an entry to a linked list of arguments 333 */ 334 void 335 addarg(type, arg) 336 int type; 337 char *arg; 338 { 339 ARG *cur; 340 341 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 342 err(1, "malloc failure"); 343 cur->next = arglist; 344 cur->type = type; 345 cur->name = arg; 346 arglist = cur; 347 } 348 349 /* 350 * addtty -- 351 * add an entry to a linked list of ttys 352 */ 353 TTY * 354 addtty(ttyname) 355 char *ttyname; 356 { 357 TTY *cur; 358 359 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 360 err(1, "malloc failure"); 361 cur->next = ttylist; 362 cur->logout = currentout; 363 memmove(cur->tty, ttyname, UT_LINESIZE); 364 return (ttylist = cur); 365 } 366 367 /* 368 * hostconv -- 369 * convert the hostname to search pattern; if the supplied host name 370 * has a domain attached that is the same as the current domain, rip 371 * off the domain suffix since that's what login(1) does. 372 */ 373 void 374 hostconv(arg) 375 char *arg; 376 { 377 static int first = 1; 378 static char *hostdot, name[MAXHOSTNAMELEN]; 379 char *argdot; 380 381 if (!(argdot = strchr(arg, '.'))) 382 return; 383 if (first) { 384 first = 0; 385 if (gethostname(name, sizeof(name))) 386 err(1, "gethostname"); 387 hostdot = strchr(name, '.'); 388 } 389 if (hostdot && !strcasecmp(hostdot, argdot)) 390 *argdot = '\0'; 391 } 392 393 /* 394 * ttyconv -- 395 * convert tty to correct name. 396 */ 397 char * 398 ttyconv(arg) 399 char *arg; 400 { 401 char *mval; 402 403 /* 404 * kludge -- we assume that all tty's end with 405 * a two character suffix. 406 */ 407 if (strlen(arg) == 2) { 408 /* either 6 for "ttyxx" or 8 for "console" */ 409 if (!(mval = malloc((u_int)8))) 410 err(1, "malloc failure"); 411 if (!strcmp(arg, "co")) 412 (void)strcpy(mval, "console"); 413 else { 414 (void)strcpy(mval, "tty"); 415 (void)strcpy(mval + 3, arg); 416 } 417 return (mval); 418 } 419 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 420 return (arg + 5); 421 return (arg); 422 } 423 424 /* 425 * onintr -- 426 * on interrupt, we inform the user how far we've gotten 427 */ 428 void 429 onintr(signo) 430 int signo; 431 { 432 char *ct; 433 434 ct = ctime(&buf[0].ut_time); 435 printf("\ninterrupted %10.10s %8.8s \n", ct, ct + 11); 436 if (signo == SIGINT) 437 exit(1); 438 (void)fflush(stdout); /* fix required for rsh */ 439 } 440
Indexes created Mon Sep 29 18:09:42 GMT 2025