[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * (sysvinit like) last implementation
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| 4 | *
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| 5 | * Copyright (C) 2008 by Patricia Muscalu <patricia.muscalu@axis.com>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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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 | /* NB: ut_name and ut_user are the same field, use only one name (ut_user)
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| 14 | * to reduce confusion */
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| 15 |
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| 16 | #ifndef SHUTDOWN_TIME
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| 17 | # define SHUTDOWN_TIME 254
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| 18 | #endif
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| 19 |
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| 20 | #define HEADER_FORMAT "%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n"
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| 21 | #define HEADER_LINE "USER", "TTY", \
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| 22 | INET_ADDRSTRLEN, INET_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
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| 23 | #define HEADER_LINE_WIDE "USER", "TTY", \
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| 24 | INET6_ADDRSTRLEN, INET6_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
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| 25 |
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| 26 | enum {
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| 27 | NORMAL,
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| 28 | LOGGED,
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| 29 | DOWN,
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| 30 | REBOOT,
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| 31 | CRASH,
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| 32 | GONE
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| 33 | };
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| 34 |
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| 35 | enum {
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| 36 | LAST_OPT_W = (1 << 0), /* -W wide */
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| 37 | LAST_OPT_f = (1 << 1), /* -f input file */
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| 38 | LAST_OPT_H = (1 << 2), /* -H header */
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| 39 | };
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| 40 |
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| 41 | #define show_wide (option_mask32 & LAST_OPT_W)
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| 42 |
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| 43 | static void show_entry(struct utmp *ut, int state, time_t dur_secs)
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| 44 | {
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| 45 | unsigned days, hours, mins;
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| 46 | char duration[32];
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| 47 | char login_time[17];
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| 48 | char logout_time[8];
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| 49 | const char *logout_str;
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| 50 | const char *duration_str;
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| 51 | time_t tmp;
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| 52 |
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| 53 | /* manpages say ut_tv.tv_sec *is* time_t,
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| 54 | * but some systems have it wrong */
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| 55 | tmp = ut->ut_tv.tv_sec;
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| 56 | safe_strncpy(login_time, ctime(&tmp), 17);
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| 57 | snprintf(logout_time, 8, "- %s", ctime(&dur_secs) + 11);
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| 58 |
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| 59 | dur_secs = MAX(dur_secs - (time_t)ut->ut_tv.tv_sec, (time_t)0);
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| 60 | /* unsigned int is easier to divide than time_t (which may be signed long) */
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| 61 | mins = dur_secs / 60;
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| 62 | days = mins / (24*60);
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| 63 | mins = mins % (24*60);
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| 64 | hours = mins / 60;
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| 65 | mins = mins % 60;
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| 66 |
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| 67 | // if (days) {
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| 68 | sprintf(duration, "(%u+%02u:%02u)", days, hours, mins);
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| 69 | // } else {
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| 70 | // sprintf(duration, " (%02u:%02u)", hours, mins);
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| 71 | // }
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| 72 |
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| 73 | logout_str = logout_time;
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| 74 | duration_str = duration;
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| 75 | switch (state) {
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| 76 | case NORMAL:
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| 77 | break;
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| 78 | case LOGGED:
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| 79 | logout_str = " still";
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| 80 | duration_str = "logged in";
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| 81 | break;
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| 82 | case DOWN:
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| 83 | logout_str = "- down ";
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| 84 | break;
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| 85 | case REBOOT:
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| 86 | break;
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| 87 | case CRASH:
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| 88 | logout_str = "- crash";
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| 89 | break;
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| 90 | case GONE:
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| 91 | logout_str = " gone";
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| 92 | duration_str = "- no logout";
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| 93 | break;
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| 94 | }
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| 95 |
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| 96 | printf(HEADER_FORMAT,
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| 97 | ut->ut_user,
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| 98 | ut->ut_line,
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| 99 | show_wide ? INET6_ADDRSTRLEN : INET_ADDRSTRLEN,
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| 100 | show_wide ? INET6_ADDRSTRLEN : INET_ADDRSTRLEN,
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| 101 | ut->ut_host,
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| 102 | login_time,
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| 103 | logout_str,
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| 104 | duration_str);
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| 105 | }
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| 106 |
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| 107 | static int get_ut_type(struct utmp *ut)
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| 108 | {
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| 109 | if (ut->ut_line[0] == '~') {
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| 110 | if (strcmp(ut->ut_user, "shutdown") == 0) {
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| 111 | return SHUTDOWN_TIME;
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| 112 | }
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| 113 | if (strcmp(ut->ut_user, "reboot") == 0) {
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| 114 | return BOOT_TIME;
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| 115 | }
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| 116 | if (strcmp(ut->ut_user, "runlevel") == 0) {
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| 117 | return RUN_LVL;
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| 118 | }
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| 119 | return ut->ut_type;
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| 120 | }
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| 121 |
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| 122 | if (ut->ut_user[0] == 0) {
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| 123 | return DEAD_PROCESS;
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| 124 | }
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| 125 |
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| 126 | if ((ut->ut_type != DEAD_PROCESS)
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| 127 | && (strcmp(ut->ut_user, "LOGIN") != 0)
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| 128 | && ut->ut_user[0]
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| 129 | && ut->ut_line[0]
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| 130 | ) {
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| 131 | ut->ut_type = USER_PROCESS;
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| 132 | }
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| 133 |
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| 134 | if (strcmp(ut->ut_user, "date") == 0) {
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| 135 | if (ut->ut_line[0] == '|') {
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| 136 | return OLD_TIME;
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| 137 | }
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| 138 | if (ut->ut_line[0] == '{') {
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| 139 | return NEW_TIME;
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| 140 | }
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| 141 | }
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| 142 | return ut->ut_type;
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| 143 | }
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| 144 |
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| 145 | static int is_runlevel_shutdown(struct utmp *ut)
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| 146 | {
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| 147 | if (((ut->ut_pid & 255) == '0') || ((ut->ut_pid & 255) == '6')) {
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| 148 | return 1;
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| 149 | }
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| 150 |
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| 151 | return 0;
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| 152 | }
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| 153 |
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| 154 | int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 155 | int last_main(int argc UNUSED_PARAM, char **argv)
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| 156 | {
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| 157 | struct utmp ut;
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| 158 | const char *filename = _PATH_WTMP;
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| 159 | llist_t *zlist;
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| 160 | off_t pos;
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| 161 | time_t start_time;
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| 162 | time_t boot_time;
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| 163 | time_t down_time;
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| 164 | int file;
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| 165 | unsigned opt;
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| 166 | smallint going_down;
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| 167 | smallint boot_down;
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| 168 |
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| 169 | opt = getopt32(argv, "Wf:" /* "H" */, &filename);
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| 170 | #ifdef BUT_UTIL_LINUX_LAST_HAS_NO_SUCH_OPT
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| 171 | if (opt & LAST_OPT_H) {
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| 172 | /* Print header line */
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| 173 | if (opt & LAST_OPT_W) {
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| 174 | printf(HEADER_FORMAT, HEADER_LINE_WIDE);
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| 175 | } else {
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| 176 | printf(HEADER_FORMAT, HEADER_LINE);
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| 177 | }
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| 178 | }
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| 179 | #endif
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| 180 |
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| 181 | file = xopen(filename, O_RDONLY);
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| 182 | {
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| 183 | /* in case the file is empty... */
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| 184 | struct stat st;
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| 185 | fstat(file, &st);
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| 186 | start_time = st.st_ctime;
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| 187 | }
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| 188 |
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| 189 | time(&down_time);
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| 190 | going_down = 0;
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| 191 | boot_down = NORMAL; /* 0 */
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| 192 | zlist = NULL;
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| 193 | boot_time = 0;
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| 194 | /* get file size, rounding down to last full record */
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| 195 | pos = xlseek(file, 0, SEEK_END) / sizeof(ut) * sizeof(ut);
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| 196 | for (;;) {
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| 197 | pos -= (off_t)sizeof(ut);
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| 198 | if (pos < 0) {
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| 199 | /* Beyond the beginning of the file boundary =>
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| 200 | * the whole file has been read. */
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| 201 | break;
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| 202 | }
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| 203 | xlseek(file, pos, SEEK_SET);
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| 204 | xread(file, &ut, sizeof(ut));
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| 205 | /* rewritten by each record, eventially will have
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| 206 | * first record's ut_tv.tv_sec: */
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| 207 | start_time = ut.ut_tv.tv_sec;
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| 208 |
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| 209 | switch (get_ut_type(&ut)) {
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| 210 | case SHUTDOWN_TIME:
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| 211 | down_time = ut.ut_tv.tv_sec;
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| 212 | boot_down = DOWN;
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| 213 | going_down = 1;
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| 214 | break;
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| 215 | case RUN_LVL:
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| 216 | if (is_runlevel_shutdown(&ut)) {
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| 217 | down_time = ut.ut_tv.tv_sec;
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| 218 | going_down = 1;
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| 219 | boot_down = DOWN;
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| 220 | }
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| 221 | break;
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| 222 | case BOOT_TIME:
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| 223 | strcpy(ut.ut_line, "system boot");
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| 224 | show_entry(&ut, REBOOT, down_time);
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| 225 | boot_down = CRASH;
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| 226 | going_down = 1;
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| 227 | break;
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| 228 | case DEAD_PROCESS:
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| 229 | if (!ut.ut_line[0]) {
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| 230 | break;
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| 231 | }
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| 232 | /* add_entry */
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| 233 | llist_add_to(&zlist, memcpy(xmalloc(sizeof(ut)), &ut, sizeof(ut)));
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| 234 | break;
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| 235 | case USER_PROCESS: {
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| 236 | int show;
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| 237 |
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| 238 | if (!ut.ut_line[0]) {
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| 239 | break;
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| 240 | }
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| 241 | /* find_entry */
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| 242 | show = 1;
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| 243 | {
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| 244 | llist_t *el, *next;
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| 245 | for (el = zlist; el; el = next) {
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| 246 | struct utmp *up = (struct utmp *)el->data;
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| 247 | next = el->link;
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| 248 | if (strncmp(up->ut_line, ut.ut_line, UT_LINESIZE) == 0) {
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| 249 | if (show) {
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| 250 | show_entry(&ut, NORMAL, up->ut_tv.tv_sec);
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| 251 | show = 0;
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| 252 | }
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| 253 | llist_unlink(&zlist, el);
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| 254 | free(el->data);
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| 255 | free(el);
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| 256 | }
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| 257 | }
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| 258 | }
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| 259 |
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| 260 | if (show) {
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| 261 | int state = boot_down;
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| 262 |
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| 263 | if (boot_time == 0) {
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| 264 | state = LOGGED;
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| 265 | /* Check if the process is alive */
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| 266 | if ((ut.ut_pid > 0)
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| 267 | && (kill(ut.ut_pid, 0) != 0)
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| 268 | && (errno == ESRCH)) {
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| 269 | state = GONE;
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| 270 | }
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| 271 | }
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| 272 | show_entry(&ut, state, boot_time);
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| 273 | }
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| 274 | /* add_entry */
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| 275 | llist_add_to(&zlist, memcpy(xmalloc(sizeof(ut)), &ut, sizeof(ut)));
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| 276 | break;
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| 277 | }
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| 278 | }
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| 279 |
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| 280 | if (going_down) {
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| 281 | boot_time = ut.ut_tv.tv_sec;
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| 282 | llist_free(zlist, free);
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| 283 | zlist = NULL;
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| 284 | going_down = 0;
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| 285 | }
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| 286 | }
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| 287 |
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| 288 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 289 | llist_free(zlist, free);
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| 290 | }
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| 291 |
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| 292 | printf("\nwtmp begins %s", ctime(&start_time));
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| 293 |
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| 294 | if (ENABLE_FEATURE_CLEAN_UP)
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| 295 | close(file);
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| 296 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 297 | }
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