294 lines
6.1 KiB
C
294 lines
6.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* (sysvinit like) last implementation
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*
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* Copyright (C) 2008 by Patricia Muscalu <patricia.muscalu@axis.com>
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*
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* Licensed under the GPLv2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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#include <utmp.h>
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/* NB: ut_name and ut_user are the same field, use only one name (ut_user)
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* to reduce confusion */
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#ifndef SHUTDOWN_TIME
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# define SHUTDOWN_TIME 254
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#endif
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#define HEADER_FORMAT "%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n"
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#define HEADER_LINE "USER", "TTY", \
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INET_ADDRSTRLEN, INET_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
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#define HEADER_LINE_WIDE "USER", "TTY", \
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INET6_ADDRSTRLEN, INET6_ADDRSTRLEN, "HOST", "LOGIN", " TIME", ""
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enum {
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NORMAL,
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LOGGED,
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DOWN,
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REBOOT,
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CRASH,
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GONE
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};
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enum {
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LAST_OPT_W = (1 << 0), /* -W wide */
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LAST_OPT_f = (1 << 1), /* -f input file */
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LAST_OPT_H = (1 << 2), /* -H header */
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};
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#define show_wide (option_mask32 & LAST_OPT_W)
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static void show_entry(struct utmp *ut, int state, time_t dur_secs)
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{
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unsigned days, hours, mins;
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char duration[32];
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char login_time[17];
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char logout_time[8];
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const char *logout_str;
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const char *duration_str;
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safe_strncpy(login_time, ctime(&(ut->ut_tv.tv_sec)), 17);
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snprintf(logout_time, 8, "- %s", ctime(&dur_secs) + 11);
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dur_secs = MAX(dur_secs - (time_t)ut->ut_tv.tv_sec, (time_t)0);
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/* unsigned int is easier to divide than time_t (which may be signed long) */
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mins = dur_secs / 60;
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days = mins / (24*60);
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mins = mins % (24*60);
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hours = mins / 60;
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mins = mins % 60;
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// if (days) {
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sprintf(duration, "(%u+%02u:%02u)", days, hours, mins);
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// } else {
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// sprintf(duration, " (%02u:%02u)", hours, mins);
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// }
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logout_str = logout_time;
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duration_str = duration;
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switch (state) {
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case NORMAL:
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break;
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case LOGGED:
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logout_str = " still";
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duration_str = "logged in";
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break;
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case DOWN:
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logout_str = "- down ";
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break;
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case REBOOT:
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break;
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case CRASH:
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logout_str = "- crash";
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break;
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case GONE:
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logout_str = " gone";
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duration_str = "- no logout";
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break;
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}
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printf(HEADER_FORMAT,
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ut->ut_user,
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ut->ut_line,
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show_wide ? INET6_ADDRSTRLEN : INET_ADDRSTRLEN,
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show_wide ? INET6_ADDRSTRLEN : INET_ADDRSTRLEN,
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ut->ut_host,
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login_time,
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logout_str,
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duration_str);
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}
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static int get_ut_type(struct utmp *ut)
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{
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if (ut->ut_line[0] == '~') {
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if (strcmp(ut->ut_user, "shutdown") == 0) {
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return SHUTDOWN_TIME;
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}
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if (strcmp(ut->ut_user, "reboot") == 0) {
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return BOOT_TIME;
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}
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if (strcmp(ut->ut_user, "runlevel") == 0) {
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return RUN_LVL;
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}
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return ut->ut_type;
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}
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if (ut->ut_user[0] == 0) {
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return DEAD_PROCESS;
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}
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if ((ut->ut_type != DEAD_PROCESS)
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&& (strcmp(ut->ut_user, "LOGIN") != 0)
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&& ut->ut_user[0]
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&& ut->ut_line[0]
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) {
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ut->ut_type = USER_PROCESS;
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}
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if (strcmp(ut->ut_user, "date") == 0) {
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if (ut->ut_line[0] == '|') {
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return OLD_TIME;
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}
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if (ut->ut_line[0] == '{') {
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return NEW_TIME;
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}
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}
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return ut->ut_type;
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}
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static int is_runlevel_shutdown(struct utmp *ut)
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{
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if (((ut->ut_pid & 255) == '0') || ((ut->ut_pid & 255) == '6')) {
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return 1;
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}
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return 0;
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}
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int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int last_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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struct utmp ut;
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const char *filename = _PATH_WTMP;
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llist_t *zlist;
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off_t pos;
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time_t start_time;
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time_t boot_time;
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time_t down_time;
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int file;
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unsigned opt;
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smallint going_down;
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smallint boot_down;
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opt = getopt32(argv, "Wf:" /* "H" */, &filename);
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#ifdef BUT_UTIL_LINUX_LAST_HAS_NO_SUCH_OPT
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if (opt & LAST_OPT_H) {
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/* Print header line */
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if (opt & LAST_OPT_W) {
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printf(HEADER_FORMAT, HEADER_LINE_WIDE);
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} else {
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printf(HEADER_FORMAT, HEADER_LINE);
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}
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}
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#endif
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file = xopen(filename, O_RDONLY);
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{
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/* in case the file is empty... */
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struct stat st;
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fstat(file, &st);
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start_time = st.st_ctime;
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}
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time(&down_time);
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going_down = 0;
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boot_down = NORMAL; /* 0 */
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zlist = NULL;
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boot_time = 0;
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/* get file size, rounding down to last full record */
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pos = xlseek(file, 0, SEEK_END) / sizeof(ut) * sizeof(ut);
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for (;;) {
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pos -= (off_t)sizeof(ut);
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if (pos < 0) {
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/* Beyond the beginning of the file boundary =>
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* the whole file has been read. */
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break;
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}
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xlseek(file, pos, SEEK_SET);
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xread(file, &ut, sizeof(ut));
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/* rewritten by each record, eventially will have
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* first record's ut_tv.tv_sec: */
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start_time = ut.ut_tv.tv_sec;
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switch (get_ut_type(&ut)) {
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case SHUTDOWN_TIME:
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down_time = ut.ut_tv.tv_sec;
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boot_down = DOWN;
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going_down = 1;
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break;
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case RUN_LVL:
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if (is_runlevel_shutdown(&ut)) {
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down_time = ut.ut_tv.tv_sec;
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going_down = 1;
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boot_down = DOWN;
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}
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break;
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case BOOT_TIME:
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strcpy(ut.ut_line, "system boot");
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show_entry(&ut, REBOOT, down_time);
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boot_down = CRASH;
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going_down = 1;
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break;
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case DEAD_PROCESS:
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if (!ut.ut_line[0]) {
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break;
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}
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/* add_entry */
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llist_add_to(&zlist, memcpy(xmalloc(sizeof(ut)), &ut, sizeof(ut)));
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break;
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case USER_PROCESS: {
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int show;
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if (!ut.ut_line[0]) {
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break;
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}
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/* find_entry */
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show = 1;
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{
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llist_t *el, *next;
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for (el = zlist; el; el = next) {
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struct utmp *up = (struct utmp *)el->data;
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next = el->link;
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if (strncmp(up->ut_line, ut.ut_line, UT_LINESIZE) == 0) {
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if (show) {
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show_entry(&ut, NORMAL, up->ut_tv.tv_sec);
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show = 0;
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}
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llist_unlink(&zlist, el);
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free(el->data);
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free(el);
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}
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}
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}
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if (show) {
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int state = boot_down;
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if (boot_time == 0) {
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state = LOGGED;
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/* Check if the process is alive */
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if ((ut.ut_pid > 0)
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&& (kill(ut.ut_pid, 0) != 0)
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&& (errno == ESRCH)) {
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state = GONE;
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}
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}
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show_entry(&ut, state, boot_time);
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}
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/* add_entry */
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llist_add_to(&zlist, memcpy(xmalloc(sizeof(ut)), &ut, sizeof(ut)));
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break;
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}
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}
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if (going_down) {
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boot_time = ut.ut_tv.tv_sec;
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llist_free(zlist, free);
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zlist = NULL;
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going_down = 0;
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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llist_free(zlist, free);
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}
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printf("\nwtmp begins %s", ctime(&start_time));
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if (ENABLE_FEATURE_CLEAN_UP)
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close(file);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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