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: "[-aH]"
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
idle_string(char * str6,time_t t)89 static 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
107 int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
who_main(int argc UNUSED_PARAM,char ** argv)108 int 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