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 <paths.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <time.h> 55 #include <tzfile.h> 56 #include <unistd.h> 57 #include <utmp.h> 58 59 #define NO 0 /* false/no */ 60 #define YES 1 /* true/yes */ 61 62 static struct utmp buf[1024]; /* utmp read buffer */ 63 64 typedef struct arg { 65 char *name; /* argument */ 66 #define HOST_TYPE -2 67 #define TTY_TYPE -3 68 #define USER_TYPE -4 69 int type; /* type of arg */ 70 struct arg *next; /* linked list pointer */ 71 } ARG; 72 ARG *arglist; /* head of linked list */ 73 74 typedef struct ttytab { 75 long logout; /* log out time */ 76 char tty[UT_LINESIZE + 1]; /* terminal name */ 77 struct ttytab *next; /* linked list pointer */ 78 } TTY; 79 TTY *ttylist; /* head of linked list */ 80 81 static long currentout, /* current logout value */ 82 maxrec; /* records to display */ 83 static char *file = _PATH_WTMP; /* wtmp file */ 84 85 void addarg __P((int, char *)); 86 TTY *addtty __P((char *)); 87 void hostconv __P((char *)); 88 void onintr __P((int)); 89 char *ttyconv __P((char *)); 90 int want __P((struct utmp *, int)); 91 void wtmp __P((void)); 92 93 int 94 main(argc, argv) 95 int argc; 96 char *argv[]; 97 { 98 extern int optind; 99 extern char *optarg; 100 int ch; 101 char *p; 102 103 maxrec = -1; 104 while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF) 105 switch (ch) { 106 case '0': case '1': case '2': case '3': case '4': 107 case '5': case '6': case '7': case '8': case '9': 108 /* 109 * kludge: last was originally designed to take 110 * a number after a dash. 111 */ 112 if (maxrec == -1) { 113 p = argv[optind - 1]; 114 if (p[0] == '-' && p[1] == ch && !p[2]) 115 maxrec = atol(++p); 116 else 117 maxrec = atol(argv[optind] + 1); 118 if (!maxrec) 119 exit(0); 120 } 121 break; 122 case 'f': 123 file = optarg; 124 break; 125 case 'h': 126 hostconv(optarg); 127 addarg(HOST_TYPE, optarg); 128 break; 129 case 't': 130 addarg(TTY_TYPE, ttyconv(optarg)); 131 break; 132 case '?': 133 default: 134 (void)fprintf(stderr, 135 "usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n"); 136 exit(1); 137 } 138 139 if (argc) { 140 setlinebuf(stdout); 141 for (argv += optind; *argv; ++argv) { 142 #define COMPATIBILITY 143 #ifdef COMPATIBILITY 144 /* code to allow "last p5" to work */ 145 addarg(TTY_TYPE, ttyconv(*argv)); 146 #endif 147 addarg(USER_TYPE, *argv); 148 } 149 } 150 wtmp(); 151 exit(0); 152 } 153 154 /* 155 * wtmp -- 156 * read through the wtmp file 157 */ 158 void 159 wtmp() 160 { 161 struct utmp *bp; /* current structure */ 162 TTY *T; /* tty list entry */ 163 struct stat stb; /* stat of file for size */ 164 long bl, delta; /* time difference */ 165 int bytes, wfd; 166 char *ct, *crmsg; 167 168 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 169 err(1, "%s", file); 170 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 171 172 (void)time(&buf[0].ut_time); 173 (void)signal(SIGINT, onintr); 174 (void)signal(SIGQUIT, onintr); 175 176 while (--bl >= 0) { 177 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 178 (bytes = read(wfd, buf, sizeof(buf))) == -1) 179 err(1, "%s", file); 180 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 181 /* 182 * if the terminal line is '~', the machine stopped. 183 * see utmp(5) for more info. 184 */ 185 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 186 /* everybody just logged out */ 187 for (T = ttylist; T; T = T->next) 188 T->logout = -bp->ut_time; 189 currentout = -bp->ut_time; 190 crmsg = strncmp(bp->ut_name, "shutdown", 191 UT_NAMESIZE) ? "crash" : "shutdown"; 192 if (want(bp, NO)) { 193 ct = ctime(&bp->ut_time); 194 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 195 UT_NAMESIZE, UT_NAMESIZE, 196 bp->ut_name, UT_LINESIZE, 197 UT_LINESIZE, bp->ut_line, 198 UT_HOSTSIZE, UT_HOSTSIZE, 199 bp->ut_host, ct, ct + 11); 200 if (maxrec != -1 && !--maxrec) 201 return; 202 } 203 continue; 204 } 205 /* 206 * if the line is '{' or '|', date got set; see 207 * utmp(5) for more info. 208 */ 209 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 210 && !bp->ut_line[1]) { 211 if (want(bp, NO)) { 212 ct = ctime(&bp->ut_time); 213 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 214 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 215 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 216 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 217 ct, ct + 11); 218 if (maxrec && !--maxrec) 219 return; 220 } 221 continue; 222 } 223 /* find associated tty */ 224 for (T = ttylist;; T = T->next) { 225 if (!T) { 226 /* add new one */ 227 T = addtty(bp->ut_line); 228 break; 229 } 230 if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE)) 231 break; 232 } 233 if (bp->ut_name[0] && want(bp, YES)) { 234 ct = ctime(&bp->ut_time); 235 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 236 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 237 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 238 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 239 ct, ct + 11); 240 if (!T->logout) 241 puts(" still logged in"); 242 else { 243 if (T->logout < 0) { 244 T->logout = -T->logout; 245 printf("- %s", crmsg); 246 } 247 else 248 printf("- %5.5s", 249 ctime(&T->logout)+11); 250 delta = T->logout - bp->ut_time; 251 if (delta < SECSPERDAY) 252 printf(" (%5.5s)\n", 253 asctime(gmtime(&delta))+11); 254 else 255 printf(" (%ld+%5.5s)\n", 256 delta / SECSPERDAY, 257 asctime(gmtime(&delta))+11); 258 } 259 if (maxrec != -1 && !--maxrec) 260 return; 261 } 262 T->logout = bp->ut_time; 263 } 264 } 265 ct = ctime(&buf[0].ut_time); 266 printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); 267 } 268 269 /* 270 * want -- 271 * see if want this entry 272 */ 273 int 274 want(bp, check) 275 struct utmp *bp; 276 int check; 277 { 278 ARG *step; 279 280 if (check) 281 /* 282 * when uucp and ftp log in over a network, the entry in 283 * the utmp file is the name plus their process id. See 284 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 285 */ 286 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 287 bp->ut_line[3] = '\0'; 288 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 289 bp->ut_line[4] = '\0'; 290 if (!arglist) 291 return (YES); 292 293 for (step = arglist; step; step = step->next) 294 switch(step->type) { 295 case HOST_TYPE: 296 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 297 return (YES); 298 break; 299 case TTY_TYPE: 300 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 301 return (YES); 302 break; 303 case USER_TYPE: 304 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 305 return (YES); 306 break; 307 } 308 return (NO); 309 } 310 311 /* 312 * addarg -- 313 * add an entry to a linked list of arguments 314 */ 315 void 316 addarg(type, arg) 317 int type; 318 char *arg; 319 { 320 ARG *cur; 321 322 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 323 err(1, "malloc failure"); 324 cur->next = arglist; 325 cur->type = type; 326 cur->name = arg; 327 arglist = cur; 328 } 329 330 /* 331 * addtty -- 332 * add an entry to a linked list of ttys 333 */ 334 TTY * 335 addtty(ttyname) 336 char *ttyname; 337 { 338 TTY *cur; 339 340 if (!(cur = (TTY *)malloc((u_int)sizeof(TTY)))) 341 err(1, "malloc failure"); 342 cur->next = ttylist; 343 cur->logout = currentout; 344 memmove(cur->tty, ttyname, UT_LINESIZE); 345 return (ttylist = cur); 346 } 347 348 /* 349 * hostconv -- 350 * convert the hostname to search pattern; if the supplied host name 351 * has a domain attached that is the same as the current domain, rip 352 * off the domain suffix since that's what login(1) does. 353 */ 354 void 355 hostconv(arg) 356 char *arg; 357 { 358 static int first = 1; 359 static char *hostdot, name[MAXHOSTNAMELEN]; 360 char *argdot; 361 362 if (!(argdot = strchr(arg, '.'))) 363 return; 364 if (first) { 365 first = 0; 366 if (gethostname(name, sizeof(name))) 367 err(1, "gethostname"); 368 hostdot = strchr(name, '.'); 369 } 370 if (hostdot && !strcasecmp(hostdot, argdot)) 371 *argdot = '\0'; 372 } 373 374 /* 375 * ttyconv -- 376 * convert tty to correct name. 377 */ 378 char * 379 ttyconv(arg) 380 char *arg; 381 { 382 char *mval; 383 384 /* 385 * kludge -- we assume that all tty's end with 386 * a two character suffix. 387 */ 388 if (strlen(arg) == 2) { 389 /* either 6 for "ttyxx" or 8 for "console" */ 390 if (!(mval = malloc((u_int)8))) 391 err(1, "malloc failure"); 392 if (!strcmp(arg, "co")) 393 (void)strcpy(mval, "console"); 394 else { 395 (void)strcpy(mval, "tty"); 396 (void)strcpy(mval + 3, arg); 397 } 398 return (mval); 399 } 400 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 401 return (arg + 5); 402 return (arg); 403 } 404 405 /* 406 * onintr -- 407 * on interrupt, we inform the user how far we've gotten 408 */ 409 void 410 onintr(signo) 411 int signo; 412 { 413 char *ct; 414 415 ct = ctime(&buf[0].ut_time); 416 printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 417 if (signo == SIGINT) 418 exit(1); 419 (void)fflush(stdout); /* fix required for rsh */ 420 } 421