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-rw-r--r--miscutils/last.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/miscutils/last.c b/miscutils/last.c
new file mode 100644
index 000000000..668f0c17d
--- /dev/null
+++ b/miscutils/last.c
@@ -0,0 +1,91 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * last implementation for busybox
4 *
5 * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
8 */
9
10#include "busybox.h"
11#include <utmp.h>
12
13#ifndef SHUTDOWN_TIME
14# define SHUTDOWN_TIME 254
15#endif
16
17/* Grr... utmp char[] members do not have to be nul-terminated.
18 * Do what we can while still keeping this reasonably small.
19 * Note: We are assuming the ut_id[] size is fixed at 4. */
20
21#if defined UT_LINESIZE \
22 && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
23#error struct utmp member char[] size(s) have changed!
24#elif defined __UT_LINESIZE \
25 && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
26#error struct utmp member char[] size(s) have changed!
27#endif
28
29int last_main(int argc, char **argv)
30{
31 struct utmp ut;
32 int n, file = STDIN_FILENO;
33 time_t t_tmp;
34
35 if (argc > 1) {
36 bb_show_usage();
37 }
38 file = xopen(bb_path_wtmp_file, O_RDONLY);
39
40 printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
41 while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
42
43 if (n != sizeof(struct utmp)) {
44 bb_perror_msg_and_die("short read");
45 }
46
47 if (strncmp(ut.ut_line, "~", 1) == 0) {
48 if (strncmp(ut.ut_user, "shutdown", 8) == 0)
49 ut.ut_type = SHUTDOWN_TIME;
50 else if (strncmp(ut.ut_user, "reboot", 6) == 0)
51 ut.ut_type = BOOT_TIME;
52 else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
53 ut.ut_type = RUN_LVL;
54 } else {
55 if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
56 ut.ut_name[0] == 0)
57 {
58 /* Don't bother. This means we can't find how long
59 * someone was logged in for. Oh well. */
60 continue;
61 }
62 if (ut.ut_type != DEAD_PROCESS &&
63 ut.ut_name[0] && ut.ut_line[0])
64 {
65 ut.ut_type = USER_PROCESS;
66 }
67 if (strcmp(ut.ut_name, "date") == 0) {
68 if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
69 if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
70 }
71 }
72
73 if (ut.ut_type!=USER_PROCESS) {
74 switch (ut.ut_type) {
75 case OLD_TIME:
76 case NEW_TIME:
77 case RUN_LVL:
78 case SHUTDOWN_TIME:
79 continue;
80 case BOOT_TIME:
81 strcpy(ut.ut_line, "system boot");
82 break;
83 }
84 }
85 t_tmp = (time_t)ut.ut_tv.tv_sec;
86 printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
87 ctime(&t_tmp) + 4);
88 }
89
90 fflush_stdout_and_exit(EXIT_SUCCESS);
91}