| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * last implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under the GPL version 2, see the file LICENSE in this tarball.
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| 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 | #include <utmp.h>
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| 12 |
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| 13 | #ifndef SHUTDOWN_TIME
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| 14 | # define SHUTDOWN_TIME 254
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| 15 | #endif
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| 16 |
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| 17 | /* Grr... utmp char[] members do not have to be nul-terminated.
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| 18 | * Do what we can while still keeping this reasonably small.
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| 19 | * Note: We are assuming the ut_id[] size is fixed at 4. */
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| 20 |
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| 21 | #if defined UT_LINESIZE \
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| 22 | && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
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| 23 | #error struct utmp member char[] size(s) have changed!
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| 24 | #elif defined __UT_LINESIZE \
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| 25 | && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
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| 26 | #error struct utmp member char[] size(s) have changed!
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| 27 | #endif
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| 28 |
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| 29 | int last_main(int argc, char **argv);
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| 30 | int last_main(int argc, char **argv)
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| 31 | {
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| 32 | struct utmp ut;
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| 33 | int n, file = STDIN_FILENO;
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| 34 | time_t t_tmp;
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| 35 |
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| 36 | if (argc > 1) {
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| 37 | bb_show_usage();
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| 38 | }
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| 39 | file = xopen(bb_path_wtmp_file, O_RDONLY);
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| 40 |
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| 41 | printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
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| 42 | while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
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| 43 |
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| 44 | if (n != sizeof(struct utmp)) {
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| 45 | bb_perror_msg_and_die("short read");
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| 46 | }
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| 47 |
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| 48 | if (ut.ut_line[0] == '~') {
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| 49 | if (strncmp(ut.ut_user, "shutdown", 8) == 0)
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| 50 | ut.ut_type = SHUTDOWN_TIME;
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| 51 | else if (strncmp(ut.ut_user, "reboot", 6) == 0)
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| 52 | ut.ut_type = BOOT_TIME;
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| 53 | else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
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| 54 | ut.ut_type = RUN_LVL;
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| 55 | } else {
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| 56 | if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
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| 57 | ut.ut_name[0] == 0)
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| 58 | {
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| 59 | /* Don't bother. This means we can't find how long
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| 60 | * someone was logged in for. Oh well. */
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| 61 | continue;
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| 62 | }
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| 63 | if (ut.ut_type != DEAD_PROCESS &&
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| 64 | ut.ut_name[0] && ut.ut_line[0])
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| 65 | {
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| 66 | ut.ut_type = USER_PROCESS;
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| 67 | }
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| 68 | if (strcmp(ut.ut_name, "date") == 0) {
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| 69 | if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
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| 70 | if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
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| 71 | }
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| 72 | }
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| 73 |
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| 74 | if (ut.ut_type!=USER_PROCESS) {
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| 75 | switch (ut.ut_type) {
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| 76 | case OLD_TIME:
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| 77 | case NEW_TIME:
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| 78 | case RUN_LVL:
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| 79 | case SHUTDOWN_TIME:
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| 80 | continue;
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| 81 | case BOOT_TIME:
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| 82 | strcpy(ut.ut_line, "system boot");
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| 83 | break;
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| 84 | }
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| 85 | }
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| 86 | t_tmp = (time_t)ut.ut_tv.tv_sec;
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| 87 | printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
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| 88 | ctime(&t_tmp) + 4);
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| 89 | }
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| 90 |
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| 91 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 92 | }
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