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annotate toys/pending/last.c @ 1776:7bf68329eb3b draft default tip

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Repository switched to git at https://github.com/landley/toybox
author Rob Landley <rob@landley.net>
date Thu, 09 Apr 2015 02:28:32 -0500
parents b0a92be71368
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* last.c - Show listing of last logged in users.
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2 *
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3 * Copyright 2013 Ranjan Kumar <ranjankumar.bth@gmail.com>
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4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
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5 *
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6 * No Standard.
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7
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8 USE_LAST(NEWTOY(last, "f:W", TOYFLAG_BIN))
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9
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10 config LAST
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11 bool "last"
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12 default n
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13 help
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14 usage: last [-W] [-f FILE]
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15
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16 Show listing of last logged in users.
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17
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18 -W Display the information without host-column truncation.
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19 -f FILE Read from file FILE instead of /var/log/wtmp.
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20 */
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21
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22 #define FOR_last
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23 #include "toys.h"
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24 #include <utmp.h>
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25
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26 #ifndef SHUTDOWN_TIME
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27 #define SHUTDOWN_TIME 254
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28 #endif
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29
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30 GLOBALS(
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31 char *file;
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32
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33 struct arg_list *list;
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34 )
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35
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36 static void free_list()
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37 {
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38 if (TT.list) {
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39 llist_traverse(TT.list, llist_free_arg);
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40 TT.list = NULL;
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41 }
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42 }
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43
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44 static void llist_add_node(struct arg_list **old, void *data)
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45 {
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46 struct arg_list *new = xmalloc(sizeof(struct arg_list));
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47
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48 new->arg = (char*)data;
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49 new->next = *old;
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50 *old = new;
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51 }
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52
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53 // Find a node and dlink it from the list.
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54 static struct arg_list *find_and_dlink(struct arg_list **list, char *devname)
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55 {
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56 struct arg_list *l = *list;
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57
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58 while (*list) {
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59 struct utmp *ut = (struct utmp *)l->arg;
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60
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61 if (!strncmp(ut->ut_line, devname, UT_LINESIZE)) {
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62 *list = (*list)->next;
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63 return l;
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64 }
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65 list = &(*list)->next;
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66 l = *list;
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67 }
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68 return NULL;
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69 }
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70
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71 // Compute login, logout and duration of login.
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72 static void seize_duration(time_t tm0, time_t tm1)
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73 {
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74 unsigned days, hours, mins;
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75 double diff = difftime(tm1, tm0);
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76
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77 diff = (diff > 0) ? (tm1 - tm0) : 0;
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78 toybuf[0] = toybuf[18] = toybuf[28] = '\0';
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79 strncpy(toybuf, ctime(&tm0), 16); // Login Time.
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80 snprintf(toybuf+18, 8, "- %s", ctime(&tm1) + 11); // Logout Time.
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81 days = (mins = diff/60)/(24*60);
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82 hours = (mins = (mins%(24*60)))/60;
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83 mins = mins%60;
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84 sprintf(toybuf+28, "(%u+%02u:%02u)", days, hours, mins); // Duration.
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85 }
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86
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87 void last_main(void)
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88 {
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89 struct utmp ut;
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90 time_t tm[3] = {0,}; //array for time avlues, previous, current
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91 char *file = "/var/log/wtmp";
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92 int fd, pwidth, curlog_type = EMPTY;
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93 off_t loc;
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94
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95 if (toys.optflags & FLAG_f) file = TT.file;
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96
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97 pwidth = (toys.optflags & FLAG_W) ? 46 : 16;
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98 *tm = time(tm+1);
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99 fd = xopen(file, O_RDONLY);
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100 loc = xlseek(fd, 0, SEEK_END);
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101
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102 // Loop through file structures in reverse order.
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103 for (;;) {
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104 loc -= sizeof(ut);
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105 if(loc < 0) break;
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106 xlseek(fd, loc, SEEK_SET);
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107
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108 // Read next structure, determine type
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109 xreadall(fd, &ut, sizeof(ut));
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110 *tm = ut.ut_tv.tv_sec;
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111 if (*ut.ut_line == '~') {
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112 if (!strcmp(ut.ut_user, "runlevel")) ut.ut_type = RUN_LVL;
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113 else if (!strcmp(ut.ut_user, "reboot")) ut.ut_type = BOOT_TIME;
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114 else if (!strcmp(ut.ut_user, "shutdown")) ut.ut_type = SHUTDOWN_TIME;
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115 } else if (!*ut.ut_user) ut.ut_type = DEAD_PROCESS;
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116 else if (*ut.ut_user && *ut.ut_line && ut.ut_type != DEAD_PROCESS
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117 && strcmp(ut.ut_user, "LOGIN")) ut.ut_type = USER_PROCESS;
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118 /* The pair of terminal names '|' / '}' logs the
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119 * old/new system time when date changes it.
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120 */
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121 if (!strcmp(ut.ut_user, "date")) {
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122 if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
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123 if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
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124 }
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125
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126 if ((ut.ut_type == SHUTDOWN_TIME) || ((ut.ut_type == RUN_LVL) &&
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127 (((ut.ut_pid & 255) == '0') || ((ut.ut_pid & 255) == '6'))))
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128 {
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129 tm[1] = tm[2] = (time_t)ut.ut_tv.tv_sec;
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130 free_list();
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131 curlog_type = RUN_LVL;
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132 } else if (ut.ut_type == BOOT_TIME) {
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133 seize_duration(tm[0], tm[1]);
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134 strcpy(ut.ut_line, "system boot");
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135 free_list();
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136 printf("%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n", ut.ut_user,
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137 ut.ut_line, pwidth, pwidth, ut.ut_host,
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138 toybuf, toybuf+18, toybuf+28);
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139 curlog_type = BOOT_TIME;
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140 tm[2] = (time_t)ut.ut_tv.tv_sec;
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141 } else if (ut.ut_type == USER_PROCESS && *ut.ut_line) {
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142 struct arg_list *l = find_and_dlink(&TT.list, ut.ut_line);
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143
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144 if (l) {
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145 struct utmp *u = (struct utmp *)l->arg;
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146 seize_duration(tm[0], u->ut_tv.tv_sec);
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147 printf("%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n", ut.ut_user,
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148 ut.ut_line, pwidth, pwidth, ut.ut_host,
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149 toybuf, toybuf+18, toybuf+28);
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150 free(l->arg);
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151 free(l);
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152 } else {
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153 int type = !tm[2] ? EMPTY : curlog_type;
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154 if (!tm[2]) { //check process's current status (alive or dead).
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155 if ((ut.ut_pid > 0) && (kill(ut.ut_pid, 0)!=0) && (errno == ESRCH))
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156 type = INIT_PROCESS;
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157 }
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158 seize_duration(tm[0], tm[2]);
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159 switch (type) {
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160 case EMPTY:
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161 strcpy(toybuf+18, " still");
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162 strcpy(toybuf+28, "logged in");
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163 break;
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164 case RUN_LVL:
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165 strcpy(toybuf+18, "- down ");
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166 break;
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167 case BOOT_TIME:
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168 strcpy(toybuf+18, "- crash");
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169 break;
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170 case INIT_PROCESS:
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171 strcpy(toybuf+18, " gone");
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172 strcpy(toybuf+28, "- no logout");
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173 break;
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174 default:
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175 break;
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176 }
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177 printf("%-8.8s %-12.12s %-*.*s %-16.16s %-7.7s %s\n", ut.ut_user,
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178 ut.ut_line, pwidth, pwidth, ut.ut_host,
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179 toybuf, toybuf+18, toybuf+28);
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180 }
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181 llist_add_node(&TT.list, memcpy(xmalloc(sizeof(ut)), &ut, sizeof(ut)));
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182 } else if (ut.ut_type == DEAD_PROCESS && *ut.ut_line)
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183 llist_add_node(&TT.list, memcpy(xmalloc(sizeof(ut)), &ut, sizeof(ut)));
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184
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185 loc -= sizeof(ut);
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186 if(loc < 0) break;
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187 xlseek(fd, loc, SEEK_SET);
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188 }
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189
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190 if (CFG_TOYBOX_FREE) {
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191 xclose(fd);
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192 free_list();
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193 }
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194
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195 xprintf("\n%s begins %-24.24s\n", basename(file), ctime(tm));
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196 }