| 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 | * |
| 5 | * Copyright (C) 2003 Erik Andersen <andersen@codepoet.org> |
| 6 | * |
| 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 | |
| 46 | extern int last_main(int argc, char **argv) |
| 47 | { |
| 48 | struct utmp ut; |
| 49 | int n, file = STDIN_FILENO; |
| 50 | |
| 51 | if (argc > 1) { |
| 52 | bb_show_usage(); |
| 53 | } |
| 54 | file = bb_xopen(_PATH_WTMP, O_RDONLY); |
| 55 | |
| 56 | printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME"); |
| 57 | while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) { |
| 58 | |
| 59 | if (n != sizeof(struct utmp)) { |
| 60 | bb_perror_msg_and_die("short read"); |
| 61 | } |
| 62 | |
| 63 | if (strncmp(ut.ut_line, "~", 1) == 0) { |
| 64 | if (strncmp(ut.ut_user, "shutdown", 8) == 0) |
| 65 | ut.ut_type = SHUTDOWN_TIME; |
| 66 | else if (strncmp(ut.ut_user, "reboot", 6) == 0) |
| 67 | ut.ut_type = BOOT_TIME; |
| 68 | else if (strncmp(ut.ut_user, "runlevel", 7) == 0) |
| 69 | ut.ut_type = RUN_LVL; |
| 70 | } else { |
| 71 | if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || |
| 72 | ut.ut_name[0] == 0) |
| 73 | { |
| 74 | /* Don't bother. This means we can't find how long |
| 75 | * someone was logged in for. Oh well. */ |
| 76 | continue; |
| 77 | } |
| 78 | if (ut.ut_type != DEAD_PROCESS && |
| 79 | ut.ut_name[0] && ut.ut_line[0]) |
| 80 | { |
| 81 | ut.ut_type = USER_PROCESS; |
| 82 | } |
| 83 | if (strcmp(ut.ut_name, "date") == 0) { |
| 84 | if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME; |
| 85 | if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | if (ut.ut_type!=USER_PROCESS) { |
| 90 | switch (ut.ut_type) { |
| 91 | case OLD_TIME: |
| 92 | case NEW_TIME: |
| 93 | case RUN_LVL: |
| 94 | case SHUTDOWN_TIME: |
| 95 | continue; |
| 96 | case BOOT_TIME: |
| 97 | strcpy(ut.ut_line, "system boot"); |
| 98 | break; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host, |
| 103 | ctime(&(ut.ut_tv.tv_sec)) + 4); |
| 104 | } |
| 105 | |
| 106 | bb_fflush_stdout_and_exit(EXIT_SUCCESS); |
| 107 | } |