usr.bin/last/last.c

   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  * $FreeBSD$
  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 static char sccsid[] = "@(#)last.c      8.2 (Berkeley) 4/2/94";
  44 #endif /* not lint */
  45
  46 #include <sys/param.h>
  47 #include <sys/stat.h>
  48
  49 #include <err.h>
  50 #include <fcntl.h>
  51 #include <langinfo.h>
  52 #include <locale.h>
  53 #include <paths.h>
  54 #include <signal.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <time.h>
  59 #include <unistd.h>
  60 #include <utmp.h>
  61 #include <sys/queue.h>
  62
  63 #define NO      0                               /* false/no */
  64 #define YES     1                               /* true/yes */
  65
  66 static struct utmp      buf[1024];              /* utmp read buffer */
  67
  68 typedef struct arg {
  69         char    *name;                          /* argument */
  70 #define HOST_TYPE       -2
  71 #define TTY_TYPE        -3
  72 #define USER_TYPE       -4
  73         int     type;                           /* type of arg */
  74         struct arg      *next;                  /* linked list pointer */
  75 } ARG;
  76 ARG     *arglist;                               /* head of linked list */
  77
  78 LIST_HEAD(ttylisthead, ttytab) ttylist;
  79
  80 struct ttytab {
  81         time_t  logout;                         /* log out time */
  82         char    tty[UT_LINESIZE + 1];           /* terminal name */
  83         LIST_ENTRY(ttytab) list;
  84 };
  85
  86 static long     currentout,                     /* current logout value */
  87                 maxrec;                         /* records to display */
  88 static char     *file = _PATH_WTMP;             /* wtmp file */
  89 static int      sflag = 0;                      /* show delta in seconds */
  90 static int      width = 5;                      /* show seconds in delta */
  91 static int      d_first;
  92
  93 void     addarg __P((int, char *));
  94 void     hostconv __P((char *));
  95 void     onintr __P((int));
  96 char    *ttyconv __P((char *));
  97 int      want __P((struct utmp *));
  98 void     wtmp __P((void));
  99
 100 void
 101 usage(void)
 102 {
 103         (void)fprintf(stderr,
 104         "usage: last [-#] [-f file] [-h hostname] [-t tty] [-s|w] [user ...]\n");
 105         exit(1);
 106 }
 107
 108 int
 109 main(argc, argv)
 110         int argc;
 111         char *argv[];
 112 {
 113         int ch;
 114         char *p;
 115
 116         (void) setlocale(LC_TIME, "");
 117         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 118
 119         maxrec = -1;
 120         while ((ch = getopt(argc, argv, "0123456789f:h:st:w")) != -1)
 121                 switch (ch) {
 122                 case '0': case '1': case '2': case '3': case '4':
 123                 case '5': case '6': case '7': case '8': case '9':
 124                         /*
 125                          * kludge: last was originally designed to take
 126                          * a number after a dash.
 127                          */
 128                         if (maxrec == -1) {
 129                                 p = argv[optind - 1];
 130                                 if (p[0] == '-' && p[1] == ch && !p[2])
 131                                         maxrec = atol(++p);
 132                                 else
 133                                         maxrec = atol(argv[optind] + 1);
 134                                 if (!maxrec)
 135                                         exit(0);
 136                         }
 137                         break;
 138                 case 'f':
 139                         file = optarg;
 140                         break;
 141                 case 'h':
 142                         hostconv(optarg);
 143                         addarg(HOST_TYPE, optarg);
 144                         break;
 145                 case 's':
 146                         sflag++;        /* Show delta as seconds */
 147                         break;
 148                 case 't':
 149                         addarg(TTY_TYPE, ttyconv(optarg));
 150                         break;
 151                 case 'w':
 152                         width = 8;
 153                         break;
 154                 case '?':
 155                 default:
 156                         usage();
 157                 }
 158
 159         if (sflag && width == 8) usage();
 160
 161         if (argc) {
 162                 setlinebuf(stdout);
 163                 for (argv += optind; *argv; ++argv) {
 164 #define COMPATIBILITY
 165 #ifdef  COMPATIBILITY
 166                         /* code to allow "last p5" to work */
 167                         addarg(TTY_TYPE, ttyconv(*argv));
 168 #endif
 169                         addarg(USER_TYPE, *argv);
 170                 }
 171         }
 172         wtmp();
 173         exit(0);
 174 }
 175
 176 /*
 177  * wtmp --
 178  *      read through the wtmp file
 179  */
 180 void
 181 wtmp()
 182 {
 183         struct utmp     *bp;                    /* current structure */
 184         struct ttytab   *tt, *ttx;              /* ttylist entry */
 185         struct stat     stb;                    /* stat of file for size */
 186         long    bl;
 187         time_t  delta;                          /* time difference */
 188         int     bytes, wfd;
 189         char    *crmsg;
 190         char ct[80];
 191         struct tm *tm;
 192
 193         LIST_INIT(&ttylist);
 194
 195         if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
 196                 err(1, "%s", file);
 197         bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
 198
 199         (void)time(&buf[0].ut_time);
 200         (void)signal(SIGINT, onintr);
 201         (void)signal(SIGQUIT, onintr);
 202
 203         while (--bl >= 0) {
 204                 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 ||
 205                     (bytes = read(wfd, buf, sizeof(buf))) == -1)
 206                         err(1, "%s", file);
 207                 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) {
 208                         /*
 209                          * if the terminal line is '~', the machine stopped.
 210                          * see utmp(5) for more info.
 211                          */
 212                         if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
 213                                 /* everybody just logged out */
 214                                 for (tt = LIST_FIRST(&ttylist); tt;) {
 215                                         LIST_REMOVE(tt, list);
 216                                         ttx = tt;
 217                                         tt = LIST_NEXT(tt, list);
 218                                         free(ttx);
 219                                 }
 220                                 currentout = -bp->ut_time;
 221                                 crmsg = strncmp(bp->ut_name, "shutdown",
 222                                     UT_NAMESIZE) ? "crash" : "shutdown";
 223                                 if (want(bp)) {
 224                                         tm = localtime(&bp->ut_time);
 225                                         (void) strftime(ct, sizeof(ct),
 226                                                      d_first ? "%a %e %b %R" :
 227                                                                "%a %b %e %R",
 228                                                      tm);
 229                                         printf("%-*.*s %-*.*s %-*.*s %s\n",
 230                                             UT_NAMESIZE, UT_NAMESIZE,
 231                                             bp->ut_name, UT_LINESIZE,
 232                                             UT_LINESIZE, bp->ut_line,
 233                                             UT_HOSTSIZE, UT_HOSTSIZE,
 234                                             bp->ut_host, ct);
 235                                         if (maxrec != -1 && !--maxrec)
 236                                                 return;
 237                                 }
 238                                 continue;
 239                         }
 240                         /*
 241                          * if the line is '{' or '|', date got set; see
 242                          * utmp(5) for more info.
 243                          */
 244                         if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|')
 245                             && !bp->ut_line[1]) {
 246                                 if (want(bp)) {
 247                                         tm = localtime(&bp->ut_time);
 248                                         (void) strftime(ct, sizeof(ct),
 249                                                      d_first ? "%a %e %b %R" :
 250                                                                "%a %b %e %R",
 251                                                      tm);
 252                                         printf("%-*.*s %-*.*s %-*.*s %s\n",
 253                                             UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
 254                                             UT_LINESIZE, UT_LINESIZE, bp->ut_line,
 255                                             UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
 256                                             ct);
 257                                         if (maxrec && !--maxrec)
 258                                                 return;
 259                                 }
 260                                 continue;
 261                         }
 262                         if (bp->ut_name[0] == '\0' || want(bp)) {
 263                                 /* find associated tty */
 264                                 LIST_FOREACH(tt, &ttylist, list)
 265                                         if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
 266                                                 break;
 267
 268                                 if (tt == NULL) {
 269                                         /* add new one */
 270                                         tt = malloc(sizeof(struct ttytab));
 271                                         if (tt == NULL)
 272                                                 err(1, "malloc failure");
 273                                         tt->logout = currentout;
 274                                         strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
 275                                         LIST_INSERT_HEAD(&ttylist, tt, list);
 276                                 }
 277
 278                                 if (bp->ut_name[0]) {
 279                                         /*
 280                                          * when uucp and ftp log in over a network, the entry in
 281                                          * the utmp file is the name plus their process id.  See
 282                                          * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
 283                                          */
 284                                         if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
 285                                                 bp->ut_line[3] = '\0';
 286                                         else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
 287                                                 bp->ut_line[4] = '\0';
 288                                         tm = localtime(&bp->ut_time);
 289                                         (void) strftime(ct, sizeof(ct),
 290                                                      d_first ? "%a %e %b %R" :
 291                                                                "%a %b %e %R",
 292                                                      tm);
 293                                         printf("%-*.*s %-*.*s %-*.*s %s ",
 294                                             UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
 295                                             UT_LINESIZE, UT_LINESIZE, bp->ut_line,
 296                                             UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
 297                                             ct);
 298                                         if (!tt->logout)
 299                                                 puts("  still logged in");
 300                                         else {
 301                                                 if (tt->logout < 0) {
 302                                                         tt->logout = -tt->logout;
 303                                                         printf("- %s", crmsg);
 304                                                 }
 305                                                 else {
 306                                                         tm = localtime(&tt->logout);
 307                                                         (void) strftime(ct, sizeof(ct), "%R", tm);
 308                                                         printf("- %s", ct);
 309                                                 }
 310                                                 delta = tt->logout - bp->ut_time;
 311                                                 if ( sflag ) {
 312                                                         printf("  (%8lu)\n",
 313                                                                 delta);
 314                                                 } else {
 315                                                     tm = gmtime(&delta);
 316                                                     (void) strftime(ct, sizeof(ct),
 317                                                      width >= 8 ? "%T" : "%R",
 318                                                      tm);
 319                                                     if (delta < 86400)
 320                                                         printf("  (%s)\n", ct);
 321                                                     else
 322                                                         printf(" (%ld+%s)\n",
 323                                                             delta / 86400,  ct);
 324                                                 }
 325                                         }
 326                                         LIST_REMOVE(tt, list);
 327                                         free(tt);
 328                                         if (maxrec != -1 && !--maxrec)
 329                                                 return;
 330                                 } else {
 331                                         tt->logout = bp->ut_time;
 332                                 }
 333                         }
 334                 }
 335         }
 336         tm = localtime(&buf[0].ut_time);
 337         (void) strftime(ct, sizeof(ct), "\nwtmp begins %c\n", tm);
 338         printf("%s", ct);
 339 }
 340
 341 /*
 342  * want --
 343  *      see if want this entry
 344  */
 345 int
 346 want(bp)
 347         struct utmp *bp;
 348 {
 349         ARG *step;
 350
 351         if (!arglist)
 352                 return (YES);
 353
 354         for (step = arglist; step; step = step->next)
 355                 switch(step->type) {
 356                 case HOST_TYPE:
 357                         if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
 358                                 return (YES);
 359                         break;
 360                 case TTY_TYPE:
 361                         if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
 362                                 return (YES);
 363                         break;
 364                 case USER_TYPE:
 365                         if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
 366                                 return (YES);
 367                         break;
 368         }
 369         return (NO);
 370 }
 371
 372 /*
 373  * addarg --
 374  *      add an entry to a linked list of arguments
 375  */
 376 void
 377 addarg(type, arg)
 378         int type;
 379         char *arg;
 380 {
 381         ARG *cur;
 382
 383         if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
 384                 err(1, "malloc failure");
 385         cur->next = arglist;
 386         cur->type = type;
 387         cur->name = arg;
 388         arglist = cur;
 389 }
 390
 391 /*
 392  * hostconv --
 393  *      convert the hostname to search pattern; if the supplied host name
 394  *      has a domain attached that is the same as the current domain, rip
 395  *      off the domain suffix since that's what login(1) does.
 396  */
 397 void
 398 hostconv(arg)
 399         char *arg;
 400 {
 401         static int first = 1;
 402         static char *hostdot, name[MAXHOSTNAMELEN];
 403         char *argdot;
 404
 405         if (!(argdot = strchr(arg, '.')))
 406                 return;
 407         if (first) {
 408                 first = 0;
 409                 if (gethostname(name, sizeof(name)))
 410                         err(1, "gethostname");
 411                 hostdot = strchr(name, '.');
 412         }
 413         if (hostdot && !strcasecmp(hostdot, argdot))
 414                 *argdot = '\0';
 415 }
 416
 417 /*
 418  * ttyconv --
 419  *      convert tty to correct name.
 420  */
 421 char *
 422 ttyconv(arg)
 423         char *arg;
 424 {
 425         char *mval;
 426
 427         /*
 428          * kludge -- we assume that all tty's end with
 429          * a two character suffix.
 430          */
 431         if (strlen(arg) == 2) {
 432                 /* either 6 for "ttyxx" or 8 for "console" */
 433                 if (!(mval = malloc((u_int)8)))
 434                         err(1, "malloc failure");
 435                 if (!strcmp(arg, "co"))
 436                         (void)strcpy(mval, "console");
 437                 else {
 438                         (void)strcpy(mval, "tty");
 439                         (void)strcpy(mval + 3, arg);
 440                 }
 441                 return (mval);
 442         }
 443         if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
 444                 return (arg + 5);
 445         return (arg);
 446 }
 447
 448 /*
 449  * onintr --
 450  *      on interrupt, we inform the user how far we've gotten
 451  */
 452 void
 453 onintr(signo)
 454         int signo;
 455 {
 456         char ct[80];
 457         struct tm *tm;
 458
 459         tm = localtime(&buf[0].ut_time);
 460         (void) strftime(ct, sizeof(ct),
 461                         d_first ? "%a %e %b %R" : "%a %b %e %R",
 462                         tm);
 463         printf("\ninterrupted %s\n", ct);
 464         if (signo == SIGINT)
 465                 exit(1);
 466         (void)fflush(stdout);                   /* fix required for rsh */
 467 }