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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