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//config:config WHO 18//config: bool "who (3.9 kb)" 19//config: default y 20//config: depends on FEATURE_UTMP 21//config: help 22//config: Print users currently logged on. 23//config: 24// procps-ng has this variation of "who": 25//config:config W 26//config: bool "w (3.8 kb)" 27//config: default y 28//config: depends on FEATURE_UTMP 29//config: help 30//config: Print users currently logged on. 31//config: 32//config:config USERS 33//config: bool "users (3.4 kb)" 34//config: default y 35//config: depends on FEATURE_UTMP 36//config: help 37//config: Print users currently logged on. 38 39// APPLET_NOEXEC:name main location suid_type help 40//applet:IF_USERS(APPLET_NOEXEC(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users)) 41//applet:IF_W( APPLET_NOEXEC(w, who, BB_DIR_USR_BIN, BB_SUID_DROP, w)) 42//applet:IF_WHO( APPLET_NOEXEC(who, who, BB_DIR_USR_BIN, BB_SUID_DROP, who)) 43 44//kbuild:lib-$(CONFIG_USERS) += who.o 45//kbuild:lib-$(CONFIG_W) += who.o 46//kbuild:lib-$(CONFIG_WHO) += who.o 47 48/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */ 49 50//usage:#define users_trivial_usage 51//usage: "" 52//usage:#define users_full_usage "\n\n" 53//usage: "Print the users currently logged on" 54 55//usage:#define w_trivial_usage 56//usage: "" 57//usage:#define w_full_usage "\n\n" 58//usage: "Show who is logged on" 59// 60// procps-ng 3.3.10: 61// "\n -h, --no-header" 62// "\n -u, --no-current" 63// Ignores the username while figuring out the current process 64// and cpu times. To demonstrate this, do a "su" and do a "w" and a "w -u". 65// "\n -s, --short" 66// Short format. Don't print the login time, JCPU or PCPU times. 67// "\n -f, --from" 68// Toggle printing the from (remote hostname) field. 69// The default is for the from field to not be printed 70// "\n -i, --ip-addr" 71// Display IP address instead of hostname for from field. 72// "\n -o, --old-style" 73// Old style output. Prints blank space for idle times less than one minute. 74// Example output: 75// 17:28:00 up 4 days, 22:41, 4 users, load average: 0.84, 0.97, 0.90 76// USER TTY LOGIN@ IDLE JCPU PCPU WHAT 77// root tty1 Thu18 4days 4:33m 0.07s /bin/sh /etc/xdg/xfce4/xinitrc -- vt 78// root pts/1 Mon13 3:24m 1:01 0.01s w 79 80//usage:#define who_trivial_usage 81//usage: "[-a]" 82//usage:#define who_full_usage "\n\n" 83//usage: "Show who is logged on\n" 84//usage: "\n -a Show all" 85//usage: "\n -H Print column headers" 86 87#include "libbb.h" 88 89static void idle_string(char *str6, time_t t) 90{ 91 t = time(NULL) - t; 92 93 /*if (t < 60) { 94 str6[0] = '.'; 95 str6[1] = '\0'; 96 return; 97 }*/ 98 if (t >= 0 && t < (24 * 60 * 60)) { 99 sprintf(str6, "%02d:%02d", 100 (int) (t / (60 * 60)), 101 (int) ((t % (60 * 60)) / 60)); 102 return; 103 } 104 strcpy(str6, "old"); 105} 106 107int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 108int who_main(int argc UNUSED_PARAM, char **argv) 109{ 110#define CNT_APPLET (ENABLE_USERS + ENABLE_W + ENABLE_WHO) 111 int do_users = (ENABLE_USERS && (CNT_APPLET == 1 || applet_name[0] == 'u')); 112 int do_w = (ENABLE_W && (CNT_APPLET == 1 || applet_name[1] == '\0')); 113 int do_who = (ENABLE_WHO && (CNT_APPLET == 1 || applet_name[1] == 'h')); 114 struct utmpx *ut; 115 unsigned opt; 116 const char *fmt = "%s"; 117 118 opt = getopt32(argv, do_who ? "^" "aH" "\0" "=0": "^" "" "\0" "=0"); 119 if ((opt & 2) || do_w) /* -H or we are w */ 120 puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST"); 121 122 setutxent(); 123 while ((ut = getutxent()) != NULL) { 124 if (ut->ut_user[0] 125 && ((opt & 1) || ut->ut_type == USER_PROCESS) 126 ) { 127 if (!do_users) { 128 char str6[6]; 129 char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1]; 130 struct stat st; 131 time_t seconds; 132 133 str6[0] = '?'; 134 str6[1] = '\0'; 135 strcpy(name, "/dev/"); 136 safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1, 137 ut->ut_line, 138 sizeof(ut->ut_line)+1 139 ); 140 if (stat(name, &st) == 0) 141 idle_string(str6, st.st_atime); 142 /* manpages say ut_tv.tv_sec *is* time_t, 143 * but some systems have it wrong */ 144 seconds = ut->ut_tv.tv_sec; 145 /* How wide time field can be? 146 * "Nov 10 19:33:20": 15 chars 147 * "2010-11-10 19:33": 16 chars 148 */ 149 printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n", 150 (int)sizeof(ut->ut_user), ut->ut_user, 151 (int)sizeof(ut->ut_line), ut->ut_line, 152 str6, 153// TODO: with LANG=en_US.UTF-8, who from coreutils 8.25 shows 154// TIME col as "2017-04-06 18:47" (the default format is "Apr 6 18:47"). 155// The former format looks saner to me. Switch to it unconditionally? 156 ctime(&seconds) + 4, 157 (int)sizeof(ut->ut_host), ut->ut_host 158 ); 159 } else { 160 printf(fmt, ut->ut_user); 161 fmt = " %s"; 162 } 163 } 164 } 165 if (do_users) 166 bb_putchar('\n'); 167 if (ENABLE_FEATURE_CLEAN_UP) 168 endutxent(); 169 return EXIT_SUCCESS; 170} 171