1/* vi: set sw=4 ts=4: */ 2/* 3 * last implementation for busybox 4 * 5 * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org> 6 * 7 * Licensed under the GPL version 2, see the file LICENSE in this tarball. 8 */ 9 10#include "libbb.h" 11#include <utmp.h> 12 13#ifndef SHUTDOWN_TIME 14# define SHUTDOWN_TIME 254 15#endif 16 17/* Grr... utmp char[] members do not have to be nul-terminated. 18 * Do what we can while still keeping this reasonably small. 19 * Note: We are assuming the ut_id[] size is fixed at 4. */ 20 21#if defined UT_LINESIZE && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE \ 22 != 256)) 23#error struct utmp member char[] size(s) have changed! 24#elif defined __UT_LINESIZE \ 25 && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256)) 26#error struct utmp member char[] size(s) have changed! 27#endif 28 29int last_main(int argc, char **argv); 30int last_main(int argc, char **argv) 31{ 32 struct utmp ut; 33 int n, file = STDIN_FILENO; 34 time_t t_tmp; 35 36 if (argc > 1) { 37 bb_show_usage(); 38 } 39 file = xopen(bb_path_wtmp_file, O_RDONLY); 40 41 printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME"); 42 while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) { 43 44 if (n != sizeof(struct utmp)) { 45 bb_perror_msg_and_die("short read"); 46 } 47 48 if (ut.ut_line[0] == '~') { 49 if (strncmp(ut.ut_user, "shutdown", 8) == 0) 50 ut.ut_type = SHUTDOWN_TIME; 51 else if (strncmp(ut.ut_user, "reboot", 6) == 0) 52 ut.ut_type = BOOT_TIME; 53 else if (strncmp(ut.ut_user, "runlevel", 7) == 0) 54 ut.ut_type = RUN_LVL; 55 } else { 56 if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 || 57 ut.ut_name[0] == 0) 58 { 59 /* Don't bother. This means we can't find how long 60 * someone was logged in for. Oh well. */ 61 continue; 62 } 63 if (ut.ut_type != DEAD_PROCESS && 64 ut.ut_name[0] && ut.ut_line[0]) 65 { 66 ut.ut_type = USER_PROCESS; 67 } 68 if (strcmp(ut.ut_name, "date") == 0) { 69 if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME; 70 if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME; 71 } 72 } 73 74 if (ut.ut_type!=USER_PROCESS) { 75 switch (ut.ut_type) { 76 case OLD_TIME: 77 case NEW_TIME: 78 case RUN_LVL: 79 case SHUTDOWN_TIME: 80 continue; 81 case BOOT_TIME: 82 strcpy(ut.ut_line, "system boot"); 83 break; 84 } 85 } 86 t_tmp = (time_t)ut.ut_tv.tv_sec; 87 printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host, 88 ctime(&t_tmp) + 4); 89 } 90 91 fflush_stdout_and_exit(EXIT_SUCCESS); 92} 93