usr.bin/who/who.c

   1 /*      $NetBSD: who.c,v 1.22 2008/07/21 14:19:28 lukem Exp $   */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Michael Fischbein.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39
  40 #include <err.h>
  41 #include <locale.h>
  42 #include <pwd.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <time.h>
  47 #include <unistd.h>
  48 #include <utmpx.h>
  49
  50 #include "utmpentry.h"
  51
  52 static void print_boottime(void);
  53 static void output_labels(void);
  54 static void who_am_i(const char *, int);
  55 static void usage(void);
  56 static void process(const char *, int);
  57 static void eprint(const struct utmpentry *);
  58 static void print(const char *, const char *, time_t, const char *, pid_t pid,
  59     uint16_t term, uint16_t xit, uint16_t sess, uint16_t type);
  60 static void quick(const char *);
  61
  62 static int show_term;                   /* show term state */
  63 static int show_idle;                   /* show idle time */
  64 static int show_details;                /* show exit status etc. */
  65 static int bflag;                       /* Show date and time of last reboot */
  66
  67 struct ut_type_names {
  68   int type;
  69   const char *name;
  70 } ut_type_names[] = {
  71   { EMPTY, "empty" },
  72   { RUN_LVL, "run level" },
  73   { BOOT_TIME, "boot time" },
  74   { OLD_TIME, "old time" },
  75   { NEW_TIME, "new time" },
  76   { INIT_PROCESS, "init process" },
  77   { LOGIN_PROCESS, "login process" },
  78   { USER_PROCESS, "user process" },
  79   { DEAD_PROCESS, "dead process" },
  80   { ACCOUNTING, "accounting" },
  81   { SIGNATURE, "signature" },
  82   { DOWN_TIME, "down time" },
  83   { -1, "unknown" }
  84 };
  85
  86 int
  87 main(int argc, char *argv[])
  88 {
  89         int c, only_current_term, show_labels, quick_mode, default_mode;
  90         int et = 0;
  91
  92         setlocale(LC_ALL, "");
  93
  94         only_current_term = show_term = show_idle = show_labels = 0;
  95         quick_mode = default_mode = 0;
  96
  97         while ((c = getopt(argc, argv, "abdHlmpqrsTtuv")) != -1) {
  98                 switch (c) {
  99                 case 'a':
 100                         et = -1;
 101                         show_idle = show_details = 1;
 102                         break;
 103                 case 'b':
 104 #if 0
 105                         et |= (1 << BOOT_TIME);
 106 #endif
 107                         bflag = 1;
 108                         break;
 109                 case 'd':
 110                         et |= (1 << DEAD_PROCESS);
 111                         break;
 112                 case 'H':
 113                         show_labels = 1;
 114                         break;
 115                 case 'l':
 116                         et |= (1 << LOGIN_PROCESS);
 117                         break;
 118                 case 'm':
 119                         only_current_term = 1;
 120                         break;
 121                 case 'p':
 122                         et |= (1 << INIT_PROCESS);
 123                         break;
 124                 case 'q':
 125                         quick_mode = 1;
 126                         break;
 127                 case 'r':
 128                         et |= (1 << RUN_LVL);
 129                         break;
 130                 case 's':
 131                         default_mode = 1;
 132                         break;
 133                 case 'T':
 134                         show_term = 1;
 135                         break;
 136                 case 't':
 137                         et |= (1 << NEW_TIME);
 138                         break;
 139                 case 'u':
 140                         show_idle = 1;
 141                         break;
 142                 case 'v':
 143                         show_details = 1;
 144                         break;
 145                 default:
 146                         usage();
 147                         /* NOTREACHED */
 148                 }
 149         }
 150         argc -= optind;
 151         argv += optind;
 152
 153         if (et != 0)
 154                 etype = et;
 155
 156         if (chdir("/dev")) {
 157                 err(EXIT_FAILURE, "cannot change directory to /dev");
 158                 /* NOTREACHED */
 159         }
 160
 161         if (default_mode)
 162                 only_current_term = show_term = show_idle = 0;
 163
 164         if (!quick_mode && bflag)
 165                 print_boottime();
 166
 167         switch (argc) {
 168         case 0:                                 /* who */
 169                 if (quick_mode) {
 170                         quick(NULL);
 171                 } else if (only_current_term) {
 172                         who_am_i(NULL, show_labels);
 173                 } else {
 174                         process(NULL, show_labels);
 175                 }
 176                 break;
 177         case 1:                                 /* who utmp_file */
 178                 if (quick_mode) {
 179                         quick(*argv);
 180                 } else if (only_current_term) {
 181                         who_am_i(*argv, show_labels);
 182                 } else {
 183                         process(*argv, show_labels);
 184                 }
 185                 break;
 186         case 2:                                 /* who am i */
 187                 who_am_i(NULL, show_labels);
 188                 break;
 189         default:
 190                 usage();
 191                 /* NOTREACHED */
 192         }
 193
 194         return 0;
 195 }
 196
 197 static void
 198 print_boottime(void)
 199 {
 200         struct timeval boottime;
 201         size_t size;
 202
 203         size = sizeof(boottime);
 204         if (sysctlbyname("kern.boottime", &boottime, &size, NULL, 0) != -1 &&
 205             boottime.tv_sec != 0) {
 206                 printf("%s", ctime(&boottime.tv_sec));
 207         }
 208 }
 209
 210
 211 static char *
 212 strrstr(const char *str, const char *pat)
 213 {
 214         const char *estr;
 215         size_t len;
 216         if (*pat == '\0')
 217                 return __DECONST(char *, str);
 218
 219         len = strlen(pat);
 220
 221         for (estr = str + strlen(str); str < estr; estr--)
 222                 if (strncmp(estr, pat, len) == 0)
 223                         return __DECONST(char *, estr);
 224         return NULL;
 225 }
 226
 227 static void
 228 who_am_i(const char *fname, int show_labels)
 229 {
 230         struct passwd *pw;
 231         const char *p;
 232         char *t;
 233         time_t now;
 234         struct utmpentry *ehead, *ep;
 235
 236         /* search through the utmpx and find an entry for this tty */
 237         if ((p = ttyname(STDIN_FILENO)) != NULL) {
 238
 239                 /* strip directory prefixes for ttys */
 240                 if ((t = strrstr(p, "/pts/")) != NULL ||
 241                     (t = strrchr(p, '/')) != NULL)
 242                         p = t + 1;
 243
 244                 (void)getutentries(fname, &ehead);
 245                 for (ep = ehead; ep; ep = ep->next)
 246                         if (strcmp(ep->line, p) == 0) {
 247                                 if (show_labels)
 248                                         output_labels();
 249                                 eprint(ep);
 250                                 return;
 251                         }
 252         } else
 253                 p = "tty??";
 254
 255         (void)time(&now);
 256         pw = getpwuid(getuid());
 257         if (show_labels)
 258                 output_labels();
 259         print(pw ? pw->pw_name : "?", p, now, "", getpid(), 0, 0, 0, 0);
 260 }
 261
 262 static void
 263 process(const char *fname, int show_labels)
 264 {
 265         struct utmpentry *ehead, *ep;
 266         (void)getutentries(fname, &ehead);
 267         if (show_labels)
 268                 output_labels();
 269         for (ep = ehead; ep != NULL; ep = ep->next)
 270                 eprint(ep);
 271 }
 272
 273 static void
 274 eprint(const struct utmpentry *ep)
 275 {
 276         print(ep->name, ep->line, (time_t)ep->tv.tv_sec, ep->host, ep->pid,
 277             ep->term, ep->exit, ep->sess, ep->type);
 278 }
 279
 280 static void
 281 print(const char *name, const char *line, time_t t, const char *host,
 282     pid_t pid, uint16_t term, uint16_t xit, uint16_t sess, uint16_t type)
 283 {
 284         struct stat sb;
 285         char state;
 286         static time_t now = 0;
 287         time_t idle;
 288         const char *types = NULL;
 289         size_t i;
 290
 291         state = '?';
 292         idle = 0;
 293
 294         for (i = 0; ut_type_names[i].type >= 0; i++) {
 295                 types = ut_type_names[i].name;
 296                 if (ut_type_names[i].type == type)
 297                         break;
 298         }
 299
 300         if (show_term || show_idle) {
 301                 if (now == 0)
 302                         time(&now);
 303
 304                 if (stat(line, &sb) == 0) {
 305                         state = (sb.st_mode & 020) ? '+' : '-';
 306                         idle = now - sb.st_atime;
 307                 }
 308
 309         }
 310
 311         (void)printf("%-*.*s ", maxname, maxname, name);
 312
 313         if (show_term)
 314                 (void)printf("%c ", state);
 315
 316         (void)printf("%-*.*s ", maxline, maxline, line);
 317         (void)printf("%.12s ", ctime(&t) + 4);
 318
 319         if (show_idle) {
 320                 if (idle < 60)
 321                         (void)printf("  .   ");
 322                 else if (idle < (24 * 60 * 60))
 323                         (void)printf("%02ld:%02ld ",
 324                                      (long)(idle / (60 * 60)),
 325                                      (long)(idle % (60 * 60)) / 60);
 326                 else
 327                         (void)printf(" old  ");
 328
 329                 (void)printf("\t%6d", pid);
 330
 331                 if (show_details) {
 332                         if (type == RUN_LVL)
 333                                 (void)printf("\tnew=%c old=%c", term, xit);
 334                         else
 335                                 (void)printf("\tterm=%d exit=%d", term, xit);
 336                         (void)printf(" sess=%d", sess);
 337                         (void)printf(" type=%s ", types);
 338                 }
 339         }
 340
 341         if (*host)
 342                 (void)printf("\t(%.*s)", maxhost, host);
 343         (void)putchar('\n');
 344 }
 345
 346 static void
 347 output_labels(void)
 348 {
 349         (void)printf("%-*.*s ", maxname, maxname, "USER");
 350
 351         if (show_term)
 352                 (void)printf("S ");
 353
 354         (void)printf("%-*.*s ", maxline, maxline, "LINE");
 355         (void)printf("WHEN         ");
 356
 357         if (show_idle) {
 358                 (void)printf("IDLE  ");
 359                 (void)printf("\t   PID");
 360
 361                 (void)printf("\tCOMMENT");
 362         }
 363
 364         (void)putchar('\n');
 365 }
 366
 367 static void
 368 quick(const char *fname)
 369 {
 370         struct utmpentry *ehead, *ep;
 371         int num = 0;
 372
 373         (void)getutentries(fname, &ehead);
 374         for (ep = ehead; ep != NULL; ep = ep->next) {
 375                 (void)printf("%-*s ", maxname, ep->name);
 376                 if ((++num % 8) == 0)
 377                         (void)putchar('\n');
 378         }
 379         if (num % 8)
 380                 (void)putchar('\n');
 381
 382         (void)printf("# users = %d\n", num);
 383 }
 384
 385 static void
 386 usage(void)
 387 {
 388         (void)fprintf(stderr, "Usage: %s [-abdHlmqrsTtuv] [file]\n\t%s am i\n",
 389             getprogname(), getprogname());
 390         exit(EXIT_FAILURE);
 391 }