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 <locale.h>
  52 #include <paths.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <time.h>
  58 #include <unistd.h>
  59 #include <utmp.h>
  60 #include <sys/queue.h>
  61
  62 #define NO      0                               /* false/no */
  63 #define YES     1                               /* true/yes */
  64
  65 static struct utmp      buf[1024];              /* utmp read buffer */
  66
  67 typedef struct arg {
  68         char    *name;                          /* argument */
  69 #define HOST_TYPE       -2
  70 #define TTY_TYPE        -3
  71 #define USER_TYPE       -4
  72         int     type;                           /* type of arg */
  73         struct arg      *next;                  /* linked list pointer */
  74 } ARG;
  75 ARG     *arglist;                               /* head of linked list */
  76
  77 LIST_HEAD(ttylisthead, ttytab) ttylist;
  78
  79 struct ttytab {
  80         time_t  logout;                         /* log out time */
  81         char    tty[UT_LINESIZE + 1];           /* terminal name */
  82         LIST_ENTRY(ttytab) list;
  83 };
  84
  85 static long     currentout,                     /* current logout value */
  86                 maxrec;                         /* records to display */
  87 static char     *file = _PATH_WTMP;             /* wtmp file */
  88 static int      sflag = 0;                      /* show delta in seconds */
  89 static int      width = 5;                      /* show seconds in delta */
  90
  91 void     addarg __P((int, char *));
  92 void     hostconv __P((char *));
  93 void     onintr __P((int));
  94 char    *ttyconv __P((char *));
  95 int      want __P((struct utmp *));
  96 void     wtmp __P((void));
  97
  98 void
  99 usage(void)
 100 {
 101         (void)fprintf(stderr,
 102         "usage: last [-#] [-f file] [-h hostname] [-t tty] [-s|w] [user ...]\n");
 103         exit(1);
 104 }
 105
 106 int
 107 main(argc, argv)
 108         int argc;
 109         char *argv[];
 110 {
 111         int ch;
 112         char *p;
 113
 114         (void) setlocale(LC_TIME, "");
 115
 116         maxrec = -1;
 117         while ((ch = getopt(argc, argv, "0123456789f:h:st:w")) != -1)
 118                 switch (ch) {
 119                 case '0': case '1': case '2': case '3': case '4':
 120                 case '5': case '6': case '7': case '8': case '9':
 121                         /*
 122                          * kludge: last was originally designed to take
 123                          * a number after a dash.
 124                          */
 125                         if (maxrec == -1) {
 126                                 p = argv[optind - 1];
 127                                 if (p[0] == '-' && p[1] == ch && !p[2])
 128                                         maxrec = atol(++p);
 129                                 else
 130                                         maxrec = atol(argv[optind] + 1);
 131                                 if (!maxrec)
 132                                         exit(0);
 133                         }
 134                         break;
 135                 case 'f':
 136                         file = optarg;
 137                         break;
 138                 case 'h':
 139                         hostconv(optarg);
 140                         addarg(HOST_TYPE, optarg);
 141                         break;
 142                 case 's':
 143                         sflag++;        /* Show delta as seconds */
 144                         break;
 145                 case 't':
 146                         addarg(TTY_TYPE, ttyconv(optarg));
 147                         break;
 148                 case 'w':
 149                         width = 8;
 150                         break;
 151                 case '?':
 152                 default:
 153                         usage();
 154                 }
 155
 156         if (sflag && width == 8) usage();
 157
 158         if (argc) {
 159                 setlinebuf(stdout);
 160                 for (argv += optind; *argv; ++argv) {
 161 #define COMPATIBILITY
 162 #ifdef  COMPATIBILITY
 163                         /* code to allow "last p5" to work */
 164                         addarg(TTY_TYPE, ttyconv(*argv));
 165 #endif
 166                         addarg(USER_TYPE, *argv);
 167                 }
 168         }
 169         wtmp();
 170         exit(0);
 171 }
 172
 173 /*
 174  * wtmp --
 175  *      read through the wtmp file
 176  */
 177 void
 178 wtmp()
 179 {
 180         struct utmp     *bp;                    /* current structure */
 181         struct ttytab   *tt, *ttx;              /* ttylist entry */
 182         struct stat     stb;                    /* stat of file for size */
 183         long    bl;
 184         time_t  delta;                          /* time difference */
 185         int     bytes, wfd;
 186         char    *crmsg;
 187         char ct[80];
 188         struct tm *tm;
 189
 190         LIST_INIT(&ttylist);
 191
 192         if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
 193                 err(1, "%s", file);
 194         bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
 195
 196         (void)time(&buf[0].ut_time);
 197         (void)signal(SIGINT, onintr);
 198         (void)signal(SIGQUIT, onintr);
 199
 200         while (--bl >= 0) {
 201                 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 ||
 202                     (bytes = read(wfd, buf, sizeof(buf))) == -1)
 203                         err(1, "%s", file);
 204                 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) {
 205                         /*
 206                          * if the terminal line is '~', the machine stopped.
 207                          * see utmp(5) for more info.
 208                          */
 209                         if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
 210                                 /* everybody just logged out */
 211                                 for (tt = ttylist.lh_first; tt;) {
 212                                         LIST_REMOVE(tt, list);
 213                                         ttx = tt;
 214                                         tt = tt->list.le_next;
 215                                         free(ttx);
 216                                 }
 217                                 currentout = -bp->ut_time;
 218                                 crmsg = strncmp(bp->ut_name, "shutdown",
 219                                     UT_NAMESIZE) ? "crash" : "shutdown";
 220                                 if (want(bp)) {
 221                                         tm = localtime(&bp->ut_time);
 222                                         (void) strftime(ct, sizeof(ct), "%c", tm);
 223                                         printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
 224                                             UT_NAMESIZE, UT_NAMESIZE,
 225                                             bp->ut_name, UT_LINESIZE,
 226                                             UT_LINESIZE, bp->ut_line,
 227                                             UT_HOSTSIZE, UT_HOSTSIZE,
 228                                             bp->ut_host, ct, ct + 11);
 229                                         if (maxrec != -1 && !--maxrec)
 230                                                 return;
 231                                 }
 232                                 continue;
 233                         }
 234                         /*
 235                          * if the line is '{' or '|', date got set; see
 236                          * utmp(5) for more info.
 237                          */
 238                         if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|')
 239                             && !bp->ut_line[1]) {
 240                                 if (want(bp)) {
 241                                         tm = localtime(&bp->ut_time);
 242                                         (void) strftime(ct, sizeof(ct), "%c", tm);
 243                                         printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
 244                                             UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
 245                                             UT_LINESIZE, UT_LINESIZE, bp->ut_line,
 246                                             UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
 247                                             ct, ct + 11);
 248                                         if (maxrec && !--maxrec)
 249                                                 return;
 250                                 }
 251                                 continue;
 252                         }
 253                         if (bp->ut_name[0] == '\0' || want(bp)) {
 254                                 /* find associated tty */
 255                                 for (tt = ttylist.lh_first; ; tt = tt->list.le_next) {
 256                                         if (tt == NULL) {
 257                                                 /* add new one */
 258                                                 tt = malloc(sizeof(struct ttytab));
 259                                                 if (tt == NULL)
 260                                                         err(1, "malloc failure");
 261                                                 tt->logout = currentout;
 262                                                 strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
 263                                                 LIST_INSERT_HEAD(&ttylist, tt, list);
 264                                                 break;
 265                                         }
 266                                         if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
 267                                                 break;
 268                                 }
 269                                 if (bp->ut_name[0]) {
 270                                         /*
 271                                          * when uucp and ftp log in over a network, the entry in
 272                                          * the utmp file is the name plus their process id.  See
 273                                          * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
 274                                          */
 275                                         if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
 276                                                 bp->ut_line[3] = '\0';
 277                                         else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
 278                                                 bp->ut_line[4] = '\0';
 279                                         tm = localtime(&bp->ut_time);
 280                                         (void) strftime(ct, sizeof(ct), "%c", tm);
 281                                         printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ",
 282                                             UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
 283                                             UT_LINESIZE, UT_LINESIZE, bp->ut_line,
 284                                             UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
 285                                             ct, ct + 11);
 286                                         if (!tt->logout)
 287                                                 puts("  still logged in");
 288                                         else {
 289                                                 if (tt->logout < 0) {
 290                                                         tt->logout = -tt->logout;
 291                                                         printf("- %s", crmsg);
 292                                                 }
 293                                                 else {
 294                                                         tm = localtime(&tt->logout);
 295                                                         (void) strftime(ct, sizeof(ct), "%c", tm);
 296                                                         printf("- %5.5s", ct + 11);
 297                                                 }
 298                                                 delta = tt->logout - bp->ut_time;
 299                                                 if ( sflag ) {
 300                                                         printf("  (%8lu)\n",
 301                                                                 delta);
 302                                                 } else {
 303                                                     tm = gmtime(&delta);
 304                                                     (void) strftime(ct, sizeof(ct), "%c", tm);
 305                                                     if (delta < 86400)
 306                                                         printf("  (%*.*s)\n", width, width, ct + 11);
 307                                                     else
 308                                                         printf(" (%ld+%*.*s)\n",
 309                                                             delta / 86400, width, width, ct + 11);
 310                                                 }
 311                                         }
 312                                         LIST_REMOVE(tt, list);
 313                                         free(tt);
 314                                         if (maxrec != -1 && !--maxrec)
 315                                                 return;
 316                                 } else {
 317                                         tt->logout = bp->ut_time;
 318                                 }
 319                         }
 320                 }
 321         }
 322         tm = localtime(&buf[0].ut_time);
 323         (void) strftime(ct, sizeof(ct), "\nwtmp begins %c\n", tm);
 324         printf("%s", ct);
 325 }
 326
 327 /*
 328  * want --
 329  *      see if want this entry
 330  */
 331 int
 332 want(bp)
 333         struct utmp *bp;
 334 {
 335         ARG *step;
 336
 337         if (!arglist)
 338                 return (YES);
 339
 340         for (step = arglist; step; step = step->next)
 341                 switch(step->type) {
 342                 case HOST_TYPE:
 343                         if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
 344                                 return (YES);
 345                         break;
 346                 case TTY_TYPE:
 347                         if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
 348                                 return (YES);
 349                         break;
 350                 case USER_TYPE:
 351                         if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
 352                                 return (YES);
 353                         break;
 354         }
 355         return (NO);
 356 }
 357
 358 /*
 359  * addarg --
 360  *      add an entry to a linked list of arguments
 361  */
 362 void
 363 addarg(type, arg)
 364         int type;
 365         char *arg;
 366 {
 367         ARG *cur;
 368
 369         if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
 370                 err(1, "malloc failure");
 371         cur->next = arglist;
 372         cur->type = type;
 373         cur->name = arg;
 374         arglist = cur;
 375 }
 376
 377 /*
 378  * hostconv --
 379  *      convert the hostname to search pattern; if the supplied host name
 380  *      has a domain attached that is the same as the current domain, rip
 381  *      off the domain suffix since that's what login(1) does.
 382  */
 383 void
 384 hostconv(arg)
 385         char *arg;
 386 {
 387         static int first = 1;
 388         static char *hostdot, name[MAXHOSTNAMELEN];
 389         char *argdot;
 390
 391         if (!(argdot = strchr(arg, '.')))
 392                 return;
 393         if (first) {
 394                 first = 0;
 395                 if (gethostname(name, sizeof(name)))
 396                         err(1, "gethostname");
 397                 hostdot = strchr(name, '.');
 398         }
 399         if (hostdot && !strcasecmp(hostdot, argdot))
 400                 *argdot = '\0';
 401 }
 402
 403 /*
 404  * ttyconv --
 405  *      convert tty to correct name.
 406  */
 407 char *
 408 ttyconv(arg)
 409         char *arg;
 410 {
 411         char *mval;
 412
 413         /*
 414          * kludge -- we assume that all tty's end with
 415          * a two character suffix.
 416          */
 417         if (strlen(arg) == 2) {
 418                 /* either 6 for "ttyxx" or 8 for "console" */
 419                 if (!(mval = malloc((u_int)8)))
 420                         err(1, "malloc failure");
 421                 if (!strcmp(arg, "co"))
 422                         (void)strcpy(mval, "console");
 423                 else {
 424                         (void)strcpy(mval, "tty");
 425                         (void)strcpy(mval + 3, arg);
 426                 }
 427                 return (mval);
 428         }
 429         if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
 430                 return (arg + 5);
 431         return (arg);
 432 }
 433
 434 /*
 435  * onintr --
 436  *      on interrupt, we inform the user how far we've gotten
 437  */
 438 void
 439 onintr(signo)
 440         int signo;
 441 {
 442         char ct[80];
 443         struct tm *tm;
 444
 445         tm = localtime(&buf[0].ut_time);
 446         (void) strftime(ct, sizeof(ct), "%c", tm);
 447         printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11);
 448         if (signo == SIGINT)
 449                 exit(1);
 450         (void)fflush(stdout);                   /* fix required for rsh */
 451 }