prosody
b48c7ed3f7f8
util-src/pposix.c

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util-src/pposix.c @ 851:b48c7ed3f7f8

util.dataforms: Return the form
author Matthew Wild <mwild1@gmail.com>
date Sun, 01 Mar 2009 23:34:25 +0000
parent 804:9bc1544c99b7
child 859:43f7e342135d
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1 /* Prosody IM v0.3
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8 */
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9
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10 /*
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11 * pposix.c
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12 * POSIX support functions for Lua
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13 */
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14
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15 #define MODULE_VERSION "0.3.0"
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16
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17 #include <stdlib.h>
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18 #include <unistd.h>
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19 #include <libgen.h>
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20 #include <sys/types.h>
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21 #include <sys/stat.h>
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22 #include <fcntl.h>
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23
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24 #include <syslog.h>
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25 #include <pwd.h>
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26
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27 #include <string.h>
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28 #include <errno.h>
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29 #include "lua.h"
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30 #include "lauxlib.h"
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31
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32 /* Daemonization support */
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33
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34 static int lc_daemonize(lua_State *L)
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35 {
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36
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37 pid_t pid;
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38
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39 if ( getppid() == 1 )
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40 {
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41 lua_pushboolean(L, 0);
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42 lua_pushstring(L, "already-daemonized");
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43 return 2;
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44 }
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45
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46 /* Attempt initial fork */
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47 if((pid = fork()) < 0)
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48 {
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49 /* Forking failed */
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50 lua_pushboolean(L, 0);
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51 lua_pushstring(L, "fork-failed");
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52 return 2;
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53 }
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54 else if(pid != 0)
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55 {
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56 /* We are the parent process */
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57 lua_pushboolean(L, 1);
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58 lua_pushnumber(L, pid);
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59 return 2;
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60 }
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61
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62 /* and we are the child process */
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63 if(setsid() == -1)
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64 {
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65 /* We failed to become session leader */
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66 /* (we probably already were) */
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67 lua_pushboolean(L, 0);
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68 lua_pushstring(L, "setsid-failed");
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69 return 2;
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70 }
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71
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72 /* Close stdin, stdout, stderr */
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73 /* close(0);
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74 close(1);
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75 close(2);
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76 */
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77 /* Final fork, use it wisely */
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78 if(fork())
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79 exit(0);
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80
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81 /* Show's over, let's continue */
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82 lua_pushboolean(L, 1);
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83 lua_pushnil(L);
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84 return 2;
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85 }
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86
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87 /* Syslog support */
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88
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89 const char * const facility_strings[] = {
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90 "auth",
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91 "authpriv",
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92 "cron",
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93 "daemon",
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94 "ftp",
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95 "kern",
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96 "local0",
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97 "local1",
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98 "local2",
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99 "local3",
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100 "local4",
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101 "local5",
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102 "local6",
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103 "local7",
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104 "lpr",
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105 "mail",
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106 "syslog",
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107 "user",
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108 "uucp",
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109 NULL
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110 };
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111 int facility_constants[] = {
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112 LOG_AUTH,
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113 LOG_AUTHPRIV,
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114 LOG_CRON,
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115 LOG_DAEMON,
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116 LOG_FTP,
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117 LOG_KERN,
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118 LOG_LOCAL0,
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119 LOG_LOCAL1,
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120 LOG_LOCAL2,
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121 LOG_LOCAL3,
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122 LOG_LOCAL4,
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123 LOG_LOCAL5,
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124 LOG_LOCAL6,
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125 LOG_LOCAL7,
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126 LOG_LPR,
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127 LOG_MAIL,
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128 LOG_NEWS,
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129 LOG_SYSLOG,
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130 LOG_USER,
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131 LOG_UUCP,
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132 -1
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133 };
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134
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135 /* "
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136 The parameter ident in the call of openlog() is probably stored as-is.
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137 Thus, if the string it points to is changed, syslog() may start
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138 prepending the changed string, and if the string it points to ceases to
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139 exist, the results are undefined. Most portable is to use a string
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140 constant.
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141 " -- syslog manpage
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142 */
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143 char* syslog_ident = NULL;
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144
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145 int lc_syslog_open(lua_State* L)
722
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146 {
796
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147 int facility = luaL_checkoption(L, 2, "daemon", facility_strings);
722
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148 facility = facility_constants[facility];
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149
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150 luaL_checkstring(L, 1);
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151
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152 if(syslog_ident)
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153 free(syslog_ident);
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154
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155 syslog_ident = strdup(lua_tostring(L, 1));
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156
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157 openlog(syslog_ident, LOG_PID, facility);
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158 return 0;
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159 }
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160
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161 const char * const level_strings[] = {
722
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162 "debug",
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163 "info",
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164 "notice",
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165 "warn",
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166 "error",
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167 NULL
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168 };
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169 int level_constants[] = {
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170 LOG_DEBUG,
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171 LOG_INFO,
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172 LOG_NOTICE,
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173 LOG_WARNING,
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174 LOG_EMERG,
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175 -1
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176 };
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177 int lc_syslog_log(lua_State* L)
722
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178 {
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179 int level = luaL_checkoption(L, 1, "notice", level_strings);
722
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180 level = level_constants[level];
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181
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182 luaL_checkstring(L, 2);
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183
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184 syslog(level, "%s", lua_tostring(L, 2));
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185 return 0;
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186 }
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187
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188 int lc_syslog_close(lua_State* L)
722
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189 {
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190 closelog();
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191 if(syslog_ident)
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192 {
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193 free(syslog_ident);
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194 syslog_ident = NULL;
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195 }
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196 return 0;
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197 }
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198
729
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199 int lc_syslog_setmask(lua_State* L)
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200 {
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201 int level_idx = luaL_checkoption(L, 1, "notice", level_strings);
729
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202 int mask = 0;
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203 do
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204 {
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205 mask |= LOG_MASK(level_constants[level_idx]);
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206 } while (++level_idx<=4);
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207
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208 setlogmask(mask);
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209 return 0;
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210 }
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211
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212 /* getpid */
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213
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214 int lc_getpid(lua_State* L)
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diff changeset
215 {
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216 lua_pushinteger(L, getpid());
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217 return 1;
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218 }
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219
804
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220 /* UID/GID functions */
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221
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222 int lc_getuid(lua_State* L)
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223 {
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diff changeset
224 lua_pushinteger(L, getuid());
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225 return 1;
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226 }
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227
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228 int lc_getgid(lua_State* L)
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229 {
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diff changeset
230 lua_pushinteger(L, getgid());
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231 return 1;
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232 }
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233
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234 int lc_setuid(lua_State* L)
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235 {
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236 int uid = -1;
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237 if(lua_gettop(L) < 1)
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238 return 0;
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diff changeset
239 if(!lua_isnumber(L, 1) && lua_tostring(L, 1))
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240 {
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diff changeset
241 /* Passed UID is actually a string, so look up the UID */
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diff changeset
242 struct passwd *p;
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243 p = getpwnam(lua_tostring(L, 1));
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244 if(!p)
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245 {
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246 lua_pushboolean(L, 0);
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diff changeset
247 lua_pushstring(L, "no-such-user");
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248 return 2;
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diff changeset
249 }
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diff changeset
250 uid = p->pw_uid;
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diff changeset
251 }
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diff changeset
252 else
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253 {
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diff changeset
254 uid = lua_tonumber(L, 1);
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255 }
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256
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257 if(uid>-1)
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258 {
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diff changeset
259 /* Ok, attempt setuid */
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diff changeset
260 errno = 0;
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261 if(setuid(uid))
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262 {
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263 /* Fail */
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264 lua_pushboolean(L, 0);
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265 switch(errno)
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266 {
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267 case EINVAL:
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268 lua_pushstring(L, "invalid-uid");
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269 break;
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270 case EPERM:
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271 lua_pushstring(L, "permission-denied");
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272 break;
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273 default:
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274 lua_pushstring(L, "unknown-error");
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275 }
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276 return 2;
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277 }
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278 else
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279 {
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280 /* Success! */
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281 lua_pushboolean(L, 1);
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282 return 1;
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283 }
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284 }
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285
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286 /* Seems we couldn't find a valid UID to switch to */
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287 lua_pushboolean(L, 0);
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288 lua_pushstring(L, "invalid-uid");
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289 return 2;
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290 }
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291
723
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292 /* Register functions */
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293
586
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294 int luaopen_util_pposix(lua_State *L)
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295 {
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296 lua_newtable(L);
722
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297
723
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298 lua_pushcfunction(L, lc_daemonize);
586
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299 lua_setfield(L, -2, "daemonize");
722
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300
723
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301 lua_pushcfunction(L, lc_syslog_open);
722
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302 lua_setfield(L, -2, "syslog_open");
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303
723
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304 lua_pushcfunction(L, lc_syslog_close);
722
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305 lua_setfield(L, -2, "syslog_close");
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306
723
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307 lua_pushcfunction(L, lc_syslog_log);
722
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308 lua_setfield(L, -2, "syslog_log");
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309
729
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310 lua_pushcfunction(L, lc_syslog_setmask);
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311 lua_setfield(L, -2, "syslog_setminlevel");
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312
723
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313 lua_pushcfunction(L, lc_getpid);
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314 lua_setfield(L, -2, "getpid");
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315
804
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316 lua_pushcfunction(L, lc_getuid);
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317 lua_setfield(L, -2, "getuid");
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318
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319 lua_pushcfunction(L, lc_setuid);
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320 lua_setfield(L, -2, "setuid");
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321
727
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322 lua_pushliteral(L, "pposix");
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323 lua_setfield(L, -2, "_NAME");
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324
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325 lua_pushliteral(L, MODULE_VERSION);
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326 lua_setfield(L, -2, "_VERSION");
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327
586
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328 return 1;
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329 };