| 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 utmpx *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 | puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
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| 85 |
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| 86 | setutxent();
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| 87 | while ((ut = getutxent()) != 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 | endutxent();
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| 130 | return EXIT_SUCCESS;
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| 131 | }
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