blob: 72386ea940dfbc2019d2602b50b27d195e8ca4d7 [file] [log] [blame]
Eric Andersen2e9c2572003-08-08 22:26:06 +00001/* vi: set sw=4 ts=4: */
2/*
3 * last implementation for busybox
4 *
Eric Andersenc7bda1c2004-03-15 08:29:22 +00005 * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersen2e9c2572003-08-08 22:26:06 +00006 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <sys/types.h>
24#include <fcntl.h>
25#include <unistd.h>
26#include <stdlib.h>
27#include <utmp.h>
28#include <sys/stat.h>
29#include <errno.h>
30#include <string.h>
31#include <time.h>
32#include "busybox.h"
33
34#ifndef SHUTDOWN_TIME
35# define SHUTDOWN_TIME 254
36#endif
37
38/* Grr... utmp char[] members do not have to be nul-terminated.
39 * Do what we can while still keeping this reasonably small.
40 * Note: We are assuming the ut_id[] size is fixed at 4. */
41
42#if (UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)
43#error struct utmp member char[] size(s) have changed!
44#endif
45
46extern int last_main(int argc, char **argv)
47{
48 struct utmp ut;
49 int n, file = STDIN_FILENO;
"Vladimir N. Oleynik"dd14ca02006-01-31 09:35:45 +000050 time_t t_tmp;
Eric Andersen2e9c2572003-08-08 22:26:06 +000051
52 if (argc > 1) {
53 bb_show_usage();
54 }
55 file = bb_xopen(_PATH_WTMP, O_RDONLY);
56
57 printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
58 while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
59
60 if (n != sizeof(struct utmp)) {
61 bb_perror_msg_and_die("short read");
62 }
63
64 if (strncmp(ut.ut_line, "~", 1) == 0) {
65 if (strncmp(ut.ut_user, "shutdown", 8) == 0)
66 ut.ut_type = SHUTDOWN_TIME;
67 else if (strncmp(ut.ut_user, "reboot", 6) == 0)
68 ut.ut_type = BOOT_TIME;
69 else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
70 ut.ut_type = RUN_LVL;
71 } else {
Eric Andersenc7bda1c2004-03-15 08:29:22 +000072 if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
Eric Andersen2e9c2572003-08-08 22:26:06 +000073 ut.ut_name[0] == 0)
74 {
Eric Andersenc7bda1c2004-03-15 08:29:22 +000075 /* Don't bother. This means we can't find how long
Eric Andersen2e9c2572003-08-08 22:26:06 +000076 * someone was logged in for. Oh well. */
77 continue;
78 }
79 if (ut.ut_type != DEAD_PROCESS &&
80 ut.ut_name[0] && ut.ut_line[0])
81 {
82 ut.ut_type = USER_PROCESS;
83 }
84 if (strcmp(ut.ut_name, "date") == 0) {
85 if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
86 if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
87 }
88 }
89
90 if (ut.ut_type!=USER_PROCESS) {
91 switch (ut.ut_type) {
92 case OLD_TIME:
93 case NEW_TIME:
94 case RUN_LVL:
95 case SHUTDOWN_TIME:
96 continue;
97 case BOOT_TIME:
98 strcpy(ut.ut_line, "system boot");
99 break;
100 }
101 }
"Vladimir N. Oleynik"dd14ca02006-01-31 09:35:45 +0000102 t_tmp = (time_t)ut.ut_tv.tv_sec;
Eric Andersen2e9c2572003-08-08 22:26:06 +0000103 printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
"Vladimir N. Oleynik"dd14ca02006-01-31 09:35:45 +0000104 ctime(&t_tmp) + 4);
Eric Andersen2e9c2572003-08-08 22:26:06 +0000105 }
106
107 bb_fflush_stdout_and_exit(EXIT_SUCCESS);
108}