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 <unistd.h> 56 #include <utmp.h> 57 #include <sys/queue.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 LIST_HEAD(ttylisthead, ttytab) ttylist; 75 76 struct ttytab { 77 long logout; /* log out time */ 78 char tty[UT_LINESIZE + 1]; /* terminal name */ 79 LIST_ENTRY(ttytab) list; 80 }; 81 82 static long currentout, /* current logout value */ 83 maxrec; /* records to display */ 84 static char *file = _PATH_WTMP; /* wtmp file */ 85 86 void addarg __P((int, char *)); 87 void hostconv __P((char *)); 88 void onintr __P((int)); 89 char *ttyconv __P((char *)); 90 int want __P((struct utmp *)); 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 struct ttytab *tt; /* ttylist 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 LIST_INIT(&ttylist); 169 170 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1) 171 err(1, "%s", file); 172 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf); 173 174 (void)time(&buf[0].ut_time); 175 (void)signal(SIGINT, onintr); 176 (void)signal(SIGQUIT, onintr); 177 178 while (--bl >= 0) { 179 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 || 180 (bytes = read(wfd, buf, sizeof(buf))) == -1) 181 err(1, "%s", file); 182 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) { 183 /* 184 * if the terminal line is '~', the machine stopped. 185 * see utmp(5) for more info. 186 */ 187 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { 188 /* everybody just logged out */ 189 for (tt = ttylist.lh_first; tt; tt = tt->list.le_next) { 190 LIST_REMOVE(tt, list); 191 free(tt); 192 } 193 currentout = -bp->ut_time; 194 crmsg = strncmp(bp->ut_name, "shutdown", 195 UT_NAMESIZE) ? "crash" : "shutdown"; 196 if (want(bp)) { 197 ct = ctime(&bp->ut_time); 198 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 199 UT_NAMESIZE, UT_NAMESIZE, 200 bp->ut_name, UT_LINESIZE, 201 UT_LINESIZE, bp->ut_line, 202 UT_HOSTSIZE, UT_HOSTSIZE, 203 bp->ut_host, ct, ct + 11); 204 if (maxrec != -1 && !--maxrec) 205 return; 206 } 207 continue; 208 } 209 /* 210 * if the line is '{' or '|', date got set; see 211 * utmp(5) for more info. 212 */ 213 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') 214 && !bp->ut_line[1]) { 215 if (want(bp)) { 216 ct = ctime(&bp->ut_time); 217 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n", 218 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 219 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 220 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 221 ct, ct + 11); 222 if (maxrec && !--maxrec) 223 return; 224 } 225 continue; 226 } 227 if (bp->ut_name[0] == '\0' || want(bp)) { 228 /* find associated tty */ 229 for (tt = ttylist.lh_first; ; tt = tt->list.le_next) { 230 if (tt == NULL) { 231 /* add new one */ 232 tt = malloc(sizeof(struct ttytab)); 233 if (tt == NULL) 234 err(1, "malloc failure"); 235 tt->logout = currentout; 236 strncpy(tt->tty, bp->ut_line, UT_LINESIZE); 237 LIST_INSERT_HEAD(&ttylist, tt, list); 238 break; 239 } 240 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE)) 241 break; 242 } 243 if (bp->ut_name[0]) { 244 /* 245 * when uucp and ftp log in over a network, the entry in 246 * the utmp file is the name plus their process id. See 247 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information. 248 */ 249 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1)) 250 bp->ut_line[3] = '\0'; 251 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1)) 252 bp->ut_line[4] = '\0'; 253 ct = ctime(&bp->ut_time); 254 printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ", 255 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name, 256 UT_LINESIZE, UT_LINESIZE, bp->ut_line, 257 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host, 258 ct, ct + 11); 259 if (!tt->logout) 260 puts(" still logged in"); 261 else { 262 if (tt->logout < 0) { 263 tt->logout = -tt->logout; 264 printf("- %s", crmsg); 265 } 266 else 267 printf("- %5.5s", 268 ctime(&tt->logout)+11); 269 delta = tt->logout - bp->ut_time; 270 if (delta < 86400) 271 printf(" (%5.5s)\n", 272 asctime(gmtime(&delta))+11); 273 else 274 printf(" (%ld+%5.5s)\n", 275 delta / 86400, 276 asctime(gmtime(&delta))+11); 277 } 278 LIST_REMOVE(tt, list); 279 free(tt); 280 if (maxrec != -1 && !--maxrec) 281 return; 282 } else { 283 tt->logout = bp->ut_time; 284 } 285 } 286 } 287 } 288 ct = ctime(&buf[0].ut_time); 289 printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11); 290 } 291 292 /* 293 * want -- 294 * see if want this entry 295 */ 296 int 297 want(bp) 298 struct utmp *bp; 299 { 300 ARG *step; 301 302 if (!arglist) 303 return (YES); 304 305 for (step = arglist; step; step = step->next) 306 switch(step->type) { 307 case HOST_TYPE: 308 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE)) 309 return (YES); 310 break; 311 case TTY_TYPE: 312 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE)) 313 return (YES); 314 break; 315 case USER_TYPE: 316 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE)) 317 return (YES); 318 break; 319 } 320 return (NO); 321 } 322 323 /* 324 * addarg -- 325 * add an entry to a linked list of arguments 326 */ 327 void 328 addarg(type, arg) 329 int type; 330 char *arg; 331 { 332 ARG *cur; 333 334 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG)))) 335 err(1, "malloc failure"); 336 cur->next = arglist; 337 cur->type = type; 338 cur->name = arg; 339 arglist = cur; 340 } 341 342 /* 343 * hostconv -- 344 * convert the hostname to search pattern; if the supplied host name 345 * has a domain attached that is the same as the current domain, rip 346 * off the domain suffix since that's what login(1) does. 347 */ 348 void 349 hostconv(arg) 350 char *arg; 351 { 352 static int first = 1; 353 static char *hostdot, name[MAXHOSTNAMELEN]; 354 char *argdot; 355 356 if (!(argdot = strchr(arg, '.'))) 357 return; 358 if (first) { 359 first = 0; 360 if (gethostname(name, sizeof(name))) 361 err(1, "gethostname"); 362 hostdot = strchr(name, '.'); 363 } 364 if (hostdot && !strcasecmp(hostdot, argdot)) 365 *argdot = '\0'; 366 } 367 368 /* 369 * ttyconv -- 370 * convert tty to correct name. 371 */ 372 char * 373 ttyconv(arg) 374 char *arg; 375 { 376 char *mval; 377 378 /* 379 * kludge -- we assume that all tty's end with 380 * a two character suffix. 381 */ 382 if (strlen(arg) == 2) { 383 /* either 6 for "ttyxx" or 8 for "console" */ 384 if (!(mval = malloc((u_int)8))) 385 err(1, "malloc failure"); 386 if (!strcmp(arg, "co")) 387 (void)strcpy(mval, "console"); 388 else { 389 (void)strcpy(mval, "tty"); 390 (void)strcpy(mval + 3, arg); 391 } 392 return (mval); 393 } 394 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1)) 395 return (arg + 5); 396 return (arg); 397 } 398 399 /* 400 * onintr -- 401 * on interrupt, we inform the user how far we've gotten 402 */ 403 void 404 onintr(signo) 405 int signo; 406 { 407 char *ct; 408 409 ct = ctime(&buf[0].ut_time); 410 printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11); 411 if (signo == SIGINT) 412 exit(1); 413 (void)fflush(stdout); /* fix required for rsh */ 414 } 415