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 v2 or later, see the file LICENSE in this tarball.
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8 | */
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9 |
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10 | #include "busybox.h"
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11 | #include <sys/types.h>
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12 | #include <fcntl.h>
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13 | #include <unistd.h>
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14 | #include <stdlib.h>
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15 | #include <utmp.h>
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16 | #include <sys/stat.h>
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17 | #include <errno.h>
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18 | #include <string.h>
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19 | #include <time.h>
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20 |
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21 | #ifndef SHUTDOWN_TIME
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22 | # define SHUTDOWN_TIME 254
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23 | #endif
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24 |
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25 | /* Grr... utmp char[] members do not have to be nul-terminated.
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26 | * Do what we can while still keeping this reasonably small.
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27 | * Note: We are assuming the ut_id[] size is fixed at 4. */
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28 |
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29 | #if defined UT_LINESIZE \
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30 | && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
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31 | #error struct utmp member char[] size(s) have changed!
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32 | #elif defined __UT_LINESIZE \
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33 | && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
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34 | #error struct utmp member char[] size(s) have changed!
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35 | #endif
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36 |
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37 | int last_main(int argc, char **argv)
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38 | {
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39 | struct utmp ut;
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40 | int n, file = STDIN_FILENO;
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41 | time_t t_tmp;
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42 |
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43 | if (argc > 1) {
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44 | bb_show_usage();
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45 | }
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46 | file = bb_xopen(bb_path_wtmp_file, O_RDONLY);
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47 |
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48 | printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
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49 | while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
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50 |
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51 | if (n != sizeof(struct utmp)) {
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52 | bb_perror_msg_and_die("short read");
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53 | }
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54 |
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55 | if (strncmp(ut.ut_line, "~", 1) == 0) {
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56 | if (strncmp(ut.ut_user, "shutdown", 8) == 0)
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57 | ut.ut_type = SHUTDOWN_TIME;
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58 | else if (strncmp(ut.ut_user, "reboot", 6) == 0)
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59 | ut.ut_type = BOOT_TIME;
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60 | else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
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61 | ut.ut_type = RUN_LVL;
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62 | } else {
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63 | if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
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64 | ut.ut_name[0] == 0)
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65 | {
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66 | /* Don't bother. This means we can't find how long
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67 | * someone was logged in for. Oh well. */
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68 | continue;
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69 | }
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70 | if (ut.ut_type != DEAD_PROCESS &&
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71 | ut.ut_name[0] && ut.ut_line[0])
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72 | {
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73 | ut.ut_type = USER_PROCESS;
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74 | }
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75 | if (strcmp(ut.ut_name, "date") == 0) {
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76 | if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
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77 | if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
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78 | }
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79 | }
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80 |
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81 | if (ut.ut_type!=USER_PROCESS) {
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82 | switch (ut.ut_type) {
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83 | case OLD_TIME:
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84 | case NEW_TIME:
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85 | case RUN_LVL:
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86 | case SHUTDOWN_TIME:
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87 | continue;
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88 | case BOOT_TIME:
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89 | strcpy(ut.ut_line, "system boot");
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90 | break;
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91 | }
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92 | }
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93 | t_tmp = (time_t)ut.ut_tv.tv_sec;
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94 | printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
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95 | ctime(&t_tmp) + 4);
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96 | }
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97 |
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98 | bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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99 | }
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