Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * last implementation for busybox |
| 4 | * |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 5 | * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org> |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 6 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 7 | * Licensed under GPLv2, see file LICENSE in this source tree. |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 10 | //usage:#define last_trivial_usage |
| 11 | //usage: ""IF_FEATURE_LAST_FANCY("[-HW] [-f FILE]") |
| 12 | //usage:#define last_full_usage "\n\n" |
| 13 | //usage: "Show listing of the last users that logged into the system" |
| 14 | //usage: IF_FEATURE_LAST_FANCY( "\n" |
| 15 | //usage: "\nOptions:" |
| 16 | /* //usage: "\n -H Show header line" */ |
| 17 | //usage: "\n -W Display with no host column truncation" |
| 18 | //usage: "\n -f FILE Read from FILE instead of /var/log/wtmp" |
| 19 | //usage: ) |
| 20 | |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 21 | #include "libbb.h" |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 22 | |
Denis Vlasenko | cd2663f | 2008-06-01 22:36:39 +0000 | [diff] [blame] | 23 | /* NB: ut_name and ut_user are the same field, use only one name (ut_user) |
| 24 | * to reduce confusion */ |
| 25 | |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 26 | #ifndef SHUTDOWN_TIME |
| 27 | # define SHUTDOWN_TIME 254 |
| 28 | #endif |
| 29 | |
Denis Vlasenko | b44c790 | 2008-03-17 09:29:43 +0000 | [diff] [blame] | 30 | /* Grr... utmp char[] members do not have to be nul-terminated. |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 31 | * Do what we can while still keeping this reasonably small. |
| 32 | * Note: We are assuming the ut_id[] size is fixed at 4. */ |
| 33 | |
Bernhard Reutner-Fischer | 781e42d | 2006-05-26 14:41:40 +0000 | [diff] [blame] | 34 | #if defined UT_LINESIZE \ |
| 35 | && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)) |
| 36 | #error struct utmp member char[] size(s) have changed! |
| 37 | #elif defined __UT_LINESIZE \ |
| 38 | && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256)) |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 39 | #error struct utmp member char[] size(s) have changed! |
| 40 | #endif |
| 41 | |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 42 | #if EMPTY != 0 || RUN_LVL != 1 || BOOT_TIME != 2 || NEW_TIME != 3 || \ |
| 43 | OLD_TIME != 4 |
| 44 | #error Values for the ut_type field of struct utmp changed |
| 45 | #endif |
| 46 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 47 | int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denys Vlasenko | 2ec91ae | 2010-01-04 14:15:38 +0100 | [diff] [blame] | 48 | int last_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 49 | { |
| 50 | struct utmp ut; |
| 51 | int n, file = STDIN_FILENO; |
"Vladimir N. Oleynik" | dd14ca0 | 2006-01-31 09:35:45 +0000 | [diff] [blame] | 52 | time_t t_tmp; |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 53 | off_t pos; |
| 54 | static const char _ut_usr[] ALIGN1 = |
| 55 | "runlevel\0" "reboot\0" "shutdown\0"; |
| 56 | static const char _ut_lin[] ALIGN1 = |
| 57 | "~\0" "{\0" "|\0" /* "LOGIN\0" "date\0" */; |
| 58 | enum { |
Denys Vlasenko | e4dcba1 | 2010-10-28 18:57:19 +0200 | [diff] [blame] | 59 | TYPE_RUN_LVL = RUN_LVL, /* 1 */ |
| 60 | TYPE_BOOT_TIME = BOOT_TIME, /* 2 */ |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 61 | TYPE_SHUTDOWN_TIME = SHUTDOWN_TIME |
| 62 | }; |
| 63 | enum { |
Denys Vlasenko | e4dcba1 | 2010-10-28 18:57:19 +0200 | [diff] [blame] | 64 | _TILDE = EMPTY, /* 0 */ |
| 65 | TYPE_NEW_TIME, /* NEW_TIME, 3 */ |
| 66 | TYPE_OLD_TIME /* OLD_TIME, 4 */ |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 67 | }; |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 68 | |
Denys Vlasenko | 2ec91ae | 2010-01-04 14:15:38 +0100 | [diff] [blame] | 69 | if (argv[1]) { |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 70 | bb_show_usage(); |
| 71 | } |
Rob Landley | d921b2e | 2006-08-03 15:41:12 +0000 | [diff] [blame] | 72 | file = xopen(bb_path_wtmp_file, O_RDONLY); |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 73 | |
Denis Vlasenko | d04e1fc | 2008-05-17 23:50:14 +0000 | [diff] [blame] | 74 | printf("%-10s %-14s %-18s %-12.12s %s\n", |
| 75 | "USER", "TTY", "HOST", "LOGIN", "TIME"); |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 76 | /* yikes. We reverse over the file and that is a not too elegant way */ |
| 77 | pos = xlseek(file, 0, SEEK_END); |
| 78 | pos = lseek(file, pos - sizeof(ut), SEEK_SET); |
Denis Vlasenko | d0a071a | 2008-03-17 09:33:45 +0000 | [diff] [blame] | 79 | while ((n = full_read(file, &ut, sizeof(ut))) > 0) { |
| 80 | if (n != sizeof(ut)) { |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 81 | bb_perror_msg_and_die("short read"); |
| 82 | } |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 83 | n = index_in_strings(_ut_lin, ut.ut_line); |
| 84 | if (n == _TILDE) { /* '~' */ |
| 85 | #if 1 |
| 86 | /* do we really need to be cautious here? */ |
| 87 | n = index_in_strings(_ut_usr, ut.ut_user); |
| 88 | if (++n > 0) |
Bernhard Reutner-Fischer | 61082ec | 2008-05-22 22:05:55 +0000 | [diff] [blame] | 89 | ut.ut_type = n != 3 ? n : SHUTDOWN_TIME; |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 90 | #else |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 91 | if (strncmp(ut.ut_user, "shutdown", 8) == 0) |
| 92 | ut.ut_type = SHUTDOWN_TIME; |
| 93 | else if (strncmp(ut.ut_user, "reboot", 6) == 0) |
| 94 | ut.ut_type = BOOT_TIME; |
Bernhard Reutner-Fischer | c8f7a97 | 2008-05-05 14:45:32 +0000 | [diff] [blame] | 95 | else if (strncmp(ut.ut_user, "runlevel", 8) == 0) |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 96 | ut.ut_type = RUN_LVL; |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 97 | #endif |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 98 | } else { |
Bernhard Reutner-Fischer | 62d8503 | 2008-06-01 10:10:22 +0000 | [diff] [blame] | 99 | if (ut.ut_user[0] == '\0' || strcmp(ut.ut_user, "LOGIN") == 0) { |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 100 | /* Don't bother. This means we can't find how long |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 101 | * someone was logged in for. Oh well. */ |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 102 | goto next; |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 103 | } |
Denis Vlasenko | d0a071a | 2008-03-17 09:33:45 +0000 | [diff] [blame] | 104 | if (ut.ut_type != DEAD_PROCESS |
Denys Vlasenko | 3a41611 | 2010-04-05 22:10:38 +0200 | [diff] [blame] | 105 | && ut.ut_user[0] |
| 106 | && ut.ut_line[0] |
Denis Vlasenko | d0a071a | 2008-03-17 09:33:45 +0000 | [diff] [blame] | 107 | ) { |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 108 | ut.ut_type = USER_PROCESS; |
| 109 | } |
Bernhard Reutner-Fischer | 62d8503 | 2008-06-01 10:10:22 +0000 | [diff] [blame] | 110 | if (strcmp(ut.ut_user, "date") == 0) { |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 111 | if (n == TYPE_OLD_TIME) { /* '|' */ |
Denis Vlasenko | d04e1fc | 2008-05-17 23:50:14 +0000 | [diff] [blame] | 112 | ut.ut_type = OLD_TIME; |
| 113 | } |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 114 | if (n == TYPE_NEW_TIME) { /* '{' */ |
Denis Vlasenko | d04e1fc | 2008-05-17 23:50:14 +0000 | [diff] [blame] | 115 | ut.ut_type = NEW_TIME; |
| 116 | } |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 117 | } |
| 118 | } |
| 119 | |
Denis Vlasenko | d0a071a | 2008-03-17 09:33:45 +0000 | [diff] [blame] | 120 | if (ut.ut_type != USER_PROCESS) { |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 121 | switch (ut.ut_type) { |
| 122 | case OLD_TIME: |
| 123 | case NEW_TIME: |
| 124 | case RUN_LVL: |
| 125 | case SHUTDOWN_TIME: |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 126 | goto next; |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 127 | case BOOT_TIME: |
| 128 | strcpy(ut.ut_line, "system boot"); |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 129 | } |
| 130 | } |
Denis Vlasenko | 0e52541 | 2008-07-11 13:57:08 +0000 | [diff] [blame] | 131 | /* manpages say ut_tv.tv_sec *is* time_t, |
| 132 | * but some systems have it wrong */ |
"Vladimir N. Oleynik" | dd14ca0 | 2006-01-31 09:35:45 +0000 | [diff] [blame] | 133 | t_tmp = (time_t)ut.ut_tv.tv_sec; |
Denis Vlasenko | d04e1fc | 2008-05-17 23:50:14 +0000 | [diff] [blame] | 134 | printf("%-10s %-14s %-18s %-12.12s\n", |
| 135 | ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4); |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 136 | next: |
Denis Vlasenko | 30f892a | 2008-05-25 01:14:14 +0000 | [diff] [blame] | 137 | pos -= sizeof(ut); |
| 138 | if (pos <= 0) |
Denis Vlasenko | dfd8282 | 2008-05-22 17:35:22 +0000 | [diff] [blame] | 139 | break; /* done. */ |
Denis Vlasenko | 30f892a | 2008-05-25 01:14:14 +0000 | [diff] [blame] | 140 | xlseek(file, pos, SEEK_SET); |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 141 | } |
| 142 | |
Denis Vlasenko | f0ed376 | 2006-10-26 23:21:47 +0000 | [diff] [blame] | 143 | fflush_stdout_and_exit(EXIT_SUCCESS); |
Eric Andersen | 2e9c257 | 2003-08-08 22:26:06 +0000 | [diff] [blame] | 144 | } |