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Eric Andersen00a6a752002-04-26 23:53:10 +00001/* vi: set sw=4 ts=4: */
Denys Vlasenkoa02a4e92017-10-05 15:19:25 +02002/*
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003 * Mini who is used to display user name, login time,
Eric Andersen00a6a752002-04-26 23:53:10 +00004 * 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 *
Eric Andersenc7bda1c2004-03-15 08:29:22 +000013 * Copyright (c) 2002 AYR Networks, Inc.
"Robert P. J. Day"801ab142006-07-12 07:56:04 +000014 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +020015 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Eric Andersen00a6a752002-04-26 23:53:10 +000016 */
Tito Ragusa7926b982011-08-09 04:37:50 +020017//config:config WHO
Denys Vlasenkob097a842018-12-28 03:20:17 +010018//config: bool "who (3.9 kb)"
Denys Vlasenko72089cf2017-07-21 09:50:55 +020019//config: default y
20//config: depends on FEATURE_UTMP
21//config: help
22//config: Print users currently logged on.
Denys Vlasenkoaf3f4202016-11-23 14:46:56 +010023//config:
Denys Vlasenko1bc0bd12017-04-11 18:17:03 +020024// procps-ng has this variation of "who":
25//config:config W
Denys Vlasenkob097a842018-12-28 03:20:17 +010026//config: bool "w (3.8 kb)"
Denys Vlasenko72089cf2017-07-21 09:50:55 +020027//config: default y
28//config: depends on FEATURE_UTMP
29//config: help
30//config: Print users currently logged on.
Denys Vlasenko1bc0bd12017-04-11 18:17:03 +020031//config:
Tito Ragusa7926b982011-08-09 04:37:50 +020032//config:config USERS
Denys Vlasenkob097a842018-12-28 03:20:17 +010033//config: bool "users (3.4 kb)"
Denys Vlasenko72089cf2017-07-21 09:50:55 +020034//config: default y
35//config: depends on FEATURE_UTMP
36//config: help
37//config: Print users currently logged on.
Tito Ragusa7926b982011-08-09 04:37:50 +020038
Denys Vlasenko1a1203f2017-08-07 16:47:34 +020039// 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))
Tito Ragusa7926b982011-08-09 04:37:50 +020043
44//kbuild:lib-$(CONFIG_USERS) += who.o
Denys Vlasenkod9eb40c2017-04-12 15:48:19 +020045//kbuild:lib-$(CONFIG_W) += who.o
46//kbuild:lib-$(CONFIG_WHO) += who.o
Tito Ragusa7926b982011-08-09 04:37:50 +020047
Denys Vlasenkoaf3f4202016-11-23 14:46:56 +010048/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */
49
Tito Ragusa7926b982011-08-09 04:37:50 +020050//usage:#define users_trivial_usage
51//usage: ""
52//usage:#define users_full_usage "\n\n"
53//usage: "Print the users currently logged on"
54
Denys Vlasenko1bc0bd12017-04-11 18:17:03 +020055//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
Pere Orga34425382011-03-31 14:43:25 +020080//usage:#define who_trivial_usage
81//usage: "[-a]"
82//usage:#define who_full_usage "\n\n"
83//usage: "Show who is logged on\n"
Pere Orga34425382011-03-31 14:43:25 +020084//usage: "\n -a Show all"
Denys Vlasenkob110e1f2012-04-18 14:38:15 +020085//usage: "\n -H Print column headers"
Pere Orga34425382011-03-31 14:43:25 +020086
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000087#include "libbb.h"
Eric Andersen00a6a752002-04-26 23:53:10 +000088
Denis Vlasenko41cca2b2007-03-07 00:07:42 +000089static void idle_string(char *str6, time_t t)
Rob Landleye01d7462006-03-12 19:26:01 +000090{
Denis Vlasenko41cca2b2007-03-07 00:07:42 +000091 t = time(NULL) - t;
Denis Vlasenko9213a9e2006-09-17 16:28:10 +000092
Denis Vlasenko41cca2b2007-03-07 00:07:42 +000093 /*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;
Rob Landleye01d7462006-03-12 19:26:01 +0000103 }
Denis Vlasenko41cca2b2007-03-07 00:07:42 +0000104 strcpy(str6, "old");
Rob Landleye01d7462006-03-12 19:26:01 +0000105}
106
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000107int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000108int who_main(int argc UNUSED_PARAM, char **argv)
Eric Andersen00a6a752002-04-26 23:53:10 +0000109{
Denys Vlasenko1bc0bd12017-04-11 18:17:03 +0200110#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'));
Bernhard Reutner-Fischer86a7f182015-04-02 23:03:46 +0200114 struct utmpx *ut;
Denis Vlasenko01cd9572007-11-16 05:24:43 +0000115 unsigned opt;
Tito Ragusa7926b982011-08-09 04:37:50 +0200116 const char *fmt = "%s";
Denis Vlasenko9213a9e2006-09-17 16:28:10 +0000117
Denys Vlasenko22542ec2017-08-08 21:55:02 +0200118 opt = getopt32(argv, do_who ? "^" "aH" "\0" "=0": "^" "" "\0" "=0");
Denys Vlasenko1bc0bd12017-04-11 18:17:03 +0200119 if ((opt & 2) || do_w) /* -H or we are w */
Denys Vlasenkod60752f2015-10-07 22:42:45 +0200120 puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
Denis Vlasenko9213a9e2006-09-17 16:28:10 +0000121
Bernhard Reutner-Fischer86a7f182015-04-02 23:03:46 +0200122 setutxent();
123 while ((ut = getutxent()) != NULL) {
Denys Vlasenko4c721042010-04-04 23:45:09 +0200124 if (ut->ut_user[0]
125 && ((opt & 1) || ut->ut_type == USER_PROCESS)
126 ) {
Tito Ragusa7926b982011-08-09 04:37:50 +0200127 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;
Denys Vlasenko4c721042010-04-04 23:45:09 +0200132
Tito Ragusa7926b982011-08-09 04:37:50 +0200133 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,
Denys Vlasenko1bc0bd12017-04-11 18:17:03 +0200153// 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?
Tito Ragusa7926b982011-08-09 04:37:50 +0200156 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 }
Rob Landleye01d7462006-03-12 19:26:01 +0000163 }
164 }
Tito Ragusa7926b982011-08-09 04:37:50 +0200165 if (do_users)
166 bb_putchar('\n');
Denis Vlasenko41cca2b2007-03-07 00:07:42 +0000167 if (ENABLE_FEATURE_CLEAN_UP)
Bernhard Reutner-Fischer86a7f182015-04-02 23:03:46 +0200168 endutxent();
Bernhard Reutner-Fischere8979882007-11-16 11:52:42 +0000169 return EXIT_SUCCESS;
Eric Andersen00a6a752002-04-26 23:53:10 +0000170}