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