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