/* vi: set sw=4 ts=4: */ /* * last implementation for busybox * * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <sys/types.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <utmp.h> #include <sys/stat.h> #include <errno.h> #include <string.h> #include <time.h> #include "busybox.h" #ifndef SHUTDOWN_TIME # define SHUTDOWN_TIME 254 #endif /* Grr... utmp char[] members do not have to be nul-terminated. * Do what we can while still keeping this reasonably small. * Note: We are assuming the ut_id[] size is fixed at 4. */ #if (UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256) #error struct utmp member char[] size(s) have changed! #endif extern int last_main(int argc, char **argv) { struct utmp ut; int n, file = STDIN_FILENO; if (argc > 1) { bb_show_usage(); } file = bb_xopen(_PATH_WTMP, O_RDONLY); printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME"); while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) { if (n != sizeof(struct utmp)) { bb_perror_msg_and_die("short read"); } if (strncmp(ut.ut_line, "~", 1) == 0) { if (strncmp(ut.ut_user, "shutdown", 8) == 0) ut.ut_type = SHUTDOWN_TIME; else if (strncmp(ut.ut_user, "reboot", 6) == 0) ut.ut_type = BOOT_TIME; else if (strncmp(ut.ut_user, "runlevel", 7) == 0) ut.ut_type = RUN_LVL; } else { if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || ut.ut_name[0] == 0) { /* Don't bother. This means we can't find how long * someone was logged in for. Oh well. */ continue; } if (ut.ut_type != DEAD_PROCESS && ut.ut_name[0] && ut.ut_line[0]) { ut.ut_type = USER_PROCESS; } if (strcmp(ut.ut_name, "date") == 0) { if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME; if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME; } } if (ut.ut_type!=USER_PROCESS) { switch (ut.ut_type) { case OLD_TIME: case NEW_TIME: case RUN_LVL: case SHUTDOWN_TIME: continue; case BOOT_TIME: strcpy(ut.ut_line, "system boot"); break; } } printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host, ctime(&(ut.ut_tv.tv_sec)) + 4); } bb_fflush_stdout_and_exit(EXIT_SUCCESS); }