release/src/router/busybox/coreutils/who.c

   1 /* vi: set sw=4 ts=4: */
   2 /*----------------------------------------------------------------------
   3  * Mini who is used to display user name, login time,
   4  * idle time and host name.
   5  *
   6  * Author: Da Chen  <dchen@ayrnetworks.com>
   7  *
   8  * This is a free document; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation:
  11  *    http://www.gnu.org/copyleft/gpl.html
  12  *
  13  * Copyright (c) 2002 AYR Networks, Inc.
  14  *
  15  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  16  *
  17  *----------------------------------------------------------------------
  18  */
  19 /* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'.  */
  20
  21 //config:config WHO
  22 //config:      bool "who"
  23 //config:      default y
  24 //config:      depends on FEATURE_UTMP
  25 //config:      help
  26 //config:        who is used to show who is logged on.
  27
  28 //config:config USERS
  29 //config:      bool "users"
  30 //config:      default y
  31 //config:      depends on FEATURE_UTMP
  32 //config:      help
  33 //config:        Print users currently logged on.
  34
  35 //applet:IF_USERS(APPLET_ODDNAME(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users))
  36 //applet:IF_WHO(  APPLET(  who, BB_DIR_USR_BIN, BB_SUID_DROP))
  37
  38 //kbuild:lib-$(CONFIG_USERS) += who.o
  39 //kbuild:lib-$(CONFIG_WHO) += who.o
  40
  41 //usage:#define users_trivial_usage
  42 //usage:       ""
  43 //usage:#define users_full_usage "\n\n"
  44 //usage:       "Print the users currently logged on"
  45
  46 //usage:#define who_trivial_usage
  47 //usage:       "[-a]"
  48 //usage:#define who_full_usage "\n\n"
  49 //usage:       "Show who is logged on\n"
  50 //usage:     "\n        -a      Show all"
  51 //usage:     "\n        -H      Print column headers"
  52
  53 #include "libbb.h"
  54
  55 static void idle_string(char *str6, time_t t)
  56 {
  57         t = time(NULL) - t;
  58
  59         /*if (t < 60) {
  60                 str6[0] = '.';
  61                 str6[1] = '\0';
  62                 return;
  63         }*/
  64         if (t >= 0 && t < (24 * 60 * 60)) {
  65                 sprintf(str6, "%02d:%02d",
  66                                 (int) (t / (60 * 60)),
  67                                 (int) ((t % (60 * 60)) / 60));
  68                 return;
  69         }
  70         strcpy(str6, "old");
  71 }
  72
  73 int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  74 int who_main(int argc UNUSED_PARAM, char **argv)
  75 {
  76         struct utmp *ut;
  77         unsigned opt;
  78         int do_users = (ENABLE_USERS && (!ENABLE_WHO || applet_name[0] == 'u'));
  79         const char *fmt = "%s";
  80
  81         opt_complementary = "=0";
  82         opt = getopt32(argv, do_users ? "" : "aH");
  83         if (opt & 2) // -H
  84                 printf("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST\n");
  85
  86         setutent();
  87         while ((ut = getutent()) != NULL) {
  88                 if (ut->ut_user[0]
  89                  && ((opt & 1) || ut->ut_type == USER_PROCESS)
  90                 ) {
  91                         if (!do_users) {
  92                                 char str6[6];
  93                                 char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
  94                                 struct stat st;
  95                                 time_t seconds;
  96
  97                                 str6[0] = '?';
  98                                 str6[1] = '\0';
  99                                 strcpy(name, "/dev/");
 100                                 safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
 101                                         ut->ut_line,
 102                                         sizeof(ut->ut_line)+1
 103                                 );
 104                                 if (stat(name, &st) == 0)
 105                                         idle_string(str6, st.st_atime);
 106                                 /* manpages say ut_tv.tv_sec *is* time_t,
 107                                  * but some systems have it wrong */
 108                                 seconds = ut->ut_tv.tv_sec;
 109                                 /* How wide time field can be?
 110                                  * "Nov 10 19:33:20": 15 chars
 111                                  * "2010-11-10 19:33": 16 chars
 112                                  */
 113                                 printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
 114                                                 (int)sizeof(ut->ut_user), ut->ut_user,
 115                                                 (int)sizeof(ut->ut_line), ut->ut_line,
 116                                                 str6,
 117                                                 ctime(&seconds) + 4,
 118                                                 (int)sizeof(ut->ut_host), ut->ut_host
 119                                 );
 120                         } else {
 121                                 printf(fmt, ut->ut_user);
 122                                 fmt = " %s";
 123                         }
 124                 }
 125         }
 126         if (do_users)
 127                 bb_putchar('\n');
 128         if (ENABLE_FEATURE_CLEAN_UP)
 129                 endutent();
 130         return EXIT_SUCCESS;
 131 }