Wed, 23 Sep 2009 13:17:13 +0100
mod_welcome: Change $user to $username in default welcome message (thanks to neustradamus for spotting)
894 | 1 | /* Prosody IM v0.4 |
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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 | -- Copyright (C) 2009 Tobias Markmann |
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5 | -- |
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6 | -- This project is MIT/X11 licensed. Please see the |
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7 | -- COPYING file in the source package for more information. |
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8 | -- |
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9 | */ |
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10 | |
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11 | /* |
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12 | * pposix.c |
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13 | * POSIX support functions for Lua |
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14 | */ |
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15 | |
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16 | #define MODULE_VERSION "0.3.1" |
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17 | |
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18 | #include <stdlib.h> |
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19 | #include <unistd.h> |
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20 | #include <libgen.h> |
859 | 21 | #include <sys/resource.h> |
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22 | #include <sys/types.h> |
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23 | #include <sys/stat.h> |
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24 | #include <fcntl.h> |
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25 | |
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26 | #include <syslog.h> |
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27 | #include <pwd.h> |
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28 | #include <grp.h> |
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29 | |
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30 | #include <string.h> |
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31 | #include <errno.h> |
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32 | #include "lua.h" |
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33 | #include "lauxlib.h" |
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34 | |
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35 | /* Daemonization support */ |
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36 | |
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37 | static int lc_daemonize(lua_State *L) |
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38 | { |
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39 | |
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40 | pid_t pid; |
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41 | |
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42 | if ( getppid() == 1 ) |
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43 | { |
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44 | lua_pushboolean(L, 0); |
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45 | lua_pushstring(L, "already-daemonized"); |
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46 | return 2; |
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47 | } |
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48 | |
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49 | /* Attempt initial fork */ |
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50 | if((pid = fork()) < 0) |
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51 | { |
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52 | /* Forking failed */ |
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53 | lua_pushboolean(L, 0); |
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54 | lua_pushstring(L, "fork-failed"); |
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55 | return 2; |
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56 | } |
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57 | else if(pid != 0) |
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58 | { |
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59 | /* We are the parent process */ |
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60 | lua_pushboolean(L, 1); |
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61 | lua_pushnumber(L, pid); |
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62 | return 2; |
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63 | } |
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64 | |
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65 | /* and we are the child process */ |
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66 | if(setsid() == -1) |
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67 | { |
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68 | /* We failed to become session leader */ |
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69 | /* (we probably already were) */ |
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70 | lua_pushboolean(L, 0); |
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71 | lua_pushstring(L, "setsid-failed"); |
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72 | return 2; |
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73 | } |
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74 | |
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75 | /* Close stdin, stdout, stderr */ |
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76 | close(0); |
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77 | close(1); |
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78 | close(2); |
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79 | |
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80 | /* Final fork, use it wisely */ |
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81 | if(fork()) |
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82 | exit(0); |
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83 | |
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84 | /* Show's over, let's continue */ |
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85 | lua_pushboolean(L, 1); |
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86 | lua_pushnil(L); |
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87 | return 2; |
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88 | } |
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89 | |
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90 | /* Syslog support */ |
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91 | |
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92 | const char * const facility_strings[] = { |
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93 | "auth", |
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94 | "authpriv", |
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95 | "cron", |
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96 | "daemon", |
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97 | "ftp", |
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98 | "kern", |
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99 | "local0", |
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100 | "local1", |
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101 | "local2", |
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102 | "local3", |
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103 | "local4", |
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104 | "local5", |
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105 | "local6", |
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106 | "local7", |
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107 | "lpr", |
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108 | "mail", |
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109 | "syslog", |
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110 | "user", |
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111 | "uucp", |
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112 | NULL |
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113 | }; |
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114 | int facility_constants[] = { |
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115 | LOG_AUTH, |
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116 | LOG_AUTHPRIV, |
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117 | LOG_CRON, |
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118 | LOG_DAEMON, |
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119 | LOG_FTP, |
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120 | LOG_KERN, |
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121 | LOG_LOCAL0, |
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122 | LOG_LOCAL1, |
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123 | LOG_LOCAL2, |
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124 | LOG_LOCAL3, |
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125 | LOG_LOCAL4, |
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126 | LOG_LOCAL5, |
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127 | LOG_LOCAL6, |
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128 | LOG_LOCAL7, |
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129 | LOG_LPR, |
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130 | LOG_MAIL, |
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131 | LOG_NEWS, |
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132 | LOG_SYSLOG, |
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133 | LOG_USER, |
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134 | LOG_UUCP, |
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135 | -1 |
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136 | }; |
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137 | |
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138 | /* " |
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139 | The parameter ident in the call of openlog() is probably stored as-is. |
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140 | Thus, if the string it points to is changed, syslog() may start |
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141 | prepending the changed string, and if the string it points to ceases to |
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142 | exist, the results are undefined. Most portable is to use a string |
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143 | constant. |
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144 | " -- syslog manpage |
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145 | */ |
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146 | char* syslog_ident = NULL; |
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147 | |
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148 | int lc_syslog_open(lua_State* L) |
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149 | { |
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150 | int facility = luaL_checkoption(L, 2, "daemon", facility_strings); |
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151 | facility = facility_constants[facility]; |
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152 | |
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153 | luaL_checkstring(L, 1); |
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154 | |
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155 | if(syslog_ident) |
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156 | free(syslog_ident); |
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157 | |
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158 | syslog_ident = strdup(lua_tostring(L, 1)); |
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159 | |
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160 | openlog(syslog_ident, LOG_PID, facility); |
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161 | return 0; |
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162 | } |
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163 | |
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164 | const char * const level_strings[] = { |
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165 | "debug", |
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166 | "info", |
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167 | "notice", |
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168 | "warn", |
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169 | "error", |
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170 | NULL |
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171 | }; |
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172 | int level_constants[] = { |
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173 | LOG_DEBUG, |
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174 | LOG_INFO, |
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175 | LOG_NOTICE, |
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176 | LOG_WARNING, |
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177 | LOG_CRIT, |
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178 | -1 |
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179 | }; |
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180 | int lc_syslog_log(lua_State* L) |
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181 | { |
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182 | int level = luaL_checkoption(L, 1, "notice", level_strings); |
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183 | level = level_constants[level]; |
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184 | |
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185 | luaL_checkstring(L, 2); |
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186 | |
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187 | syslog(level, "%s", lua_tostring(L, 2)); |
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188 | return 0; |
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189 | } |
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190 | |
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191 | int lc_syslog_close(lua_State* L) |
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192 | { |
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193 | closelog(); |
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194 | if(syslog_ident) |
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195 | { |
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196 | free(syslog_ident); |
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197 | syslog_ident = NULL; |
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198 | } |
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199 | return 0; |
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200 | } |
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201 | |
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202 | int lc_syslog_setmask(lua_State* L) |
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203 | { |
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204 | int level_idx = luaL_checkoption(L, 1, "notice", level_strings); |
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205 | int mask = 0; |
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206 | do |
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207 | { |
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208 | mask |= LOG_MASK(level_constants[level_idx]); |
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209 | } while (++level_idx<=4); |
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210 | |
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211 | setlogmask(mask); |
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212 | return 0; |
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213 | } |
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214 | |
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215 | /* getpid */ |
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216 | |
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217 | int lc_getpid(lua_State* L) |
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218 | { |
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219 | lua_pushinteger(L, getpid()); |
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220 | return 1; |
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221 | } |
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222 | |
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223 | /* UID/GID functions */ |
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224 | |
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225 | int lc_getuid(lua_State* L) |
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226 | { |
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227 | lua_pushinteger(L, getuid()); |
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228 | return 1; |
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229 | } |
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230 | |
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231 | int lc_getgid(lua_State* L) |
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232 | { |
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233 | lua_pushinteger(L, getgid()); |
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234 | return 1; |
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235 | } |
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236 | |
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237 | int lc_setuid(lua_State* L) |
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238 | { |
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239 | int uid = -1; |
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240 | if(lua_gettop(L) < 1) |
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241 | return 0; |
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242 | if(!lua_isnumber(L, 1) && lua_tostring(L, 1)) |
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243 | { |
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244 | /* Passed UID is actually a string, so look up the UID */ |
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245 | struct passwd *p; |
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246 | p = getpwnam(lua_tostring(L, 1)); |
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247 | if(!p) |
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248 | { |
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249 | lua_pushboolean(L, 0); |
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250 | lua_pushstring(L, "no-such-user"); |
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251 | return 2; |
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252 | } |
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253 | uid = p->pw_uid; |
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254 | } |
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255 | else |
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256 | { |
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257 | uid = lua_tonumber(L, 1); |
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258 | } |
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259 | |
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260 | if(uid>-1) |
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261 | { |
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262 | /* Ok, attempt setuid */ |
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263 | errno = 0; |
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264 | if(setuid(uid)) |
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265 | { |
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266 | /* Fail */ |
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267 | lua_pushboolean(L, 0); |
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268 | switch(errno) |
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269 | { |
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270 | case EINVAL: |
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271 | lua_pushstring(L, "invalid-uid"); |
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272 | break; |
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273 | case EPERM: |
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274 | lua_pushstring(L, "permission-denied"); |
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275 | break; |
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276 | default: |
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277 | lua_pushstring(L, "unknown-error"); |
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278 | } |
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279 | return 2; |
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280 | } |
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281 | else |
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282 | { |
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283 | /* Success! */ |
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284 | lua_pushboolean(L, 1); |
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285 | return 1; |
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286 | } |
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287 | } |
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288 | |
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289 | /* Seems we couldn't find a valid UID to switch to */ |
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290 | lua_pushboolean(L, 0); |
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291 | lua_pushstring(L, "invalid-uid"); |
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292 | return 2; |
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293 | } |
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294 | |
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295 | int lc_setgid(lua_State* L) |
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296 | { |
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297 | int gid = -1; |
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298 | if(lua_gettop(L) < 1) |
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299 | return 0; |
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300 | if(!lua_isnumber(L, 1) && lua_tostring(L, 1)) |
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301 | { |
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302 | /* Passed GID is actually a string, so look up the GID */ |
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303 | struct group *g; |
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304 | g = getgrnam(lua_tostring(L, 1)); |
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305 | if(!g) |
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306 | { |
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307 | lua_pushboolean(L, 0); |
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308 | lua_pushstring(L, "no-such-group"); |
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309 | return 2; |
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310 | } |
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311 | gid = g->gr_gid; |
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312 | } |
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313 | else |
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314 | { |
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315 | gid = lua_tonumber(L, 1); |
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316 | } |
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317 | |
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318 | if(gid>-1) |
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319 | { |
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320 | /* Ok, attempt setgid */ |
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321 | errno = 0; |
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322 | if(setgid(gid)) |
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323 | { |
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324 | /* Fail */ |
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325 | lua_pushboolean(L, 0); |
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326 | switch(errno) |
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327 | { |
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328 | case EINVAL: |
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329 | lua_pushstring(L, "invalid-gid"); |
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330 | break; |
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331 | case EPERM: |
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332 | lua_pushstring(L, "permission-denied"); |
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333 | break; |
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334 | default: |
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335 | lua_pushstring(L, "unknown-error"); |
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336 | } |
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337 | return 2; |
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338 | } |
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339 | else |
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340 | { |
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341 | /* Success! */ |
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342 | lua_pushboolean(L, 1); |
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343 | return 1; |
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344 | } |
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345 | } |
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346 | |
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347 | /* Seems we couldn't find a valid GID to switch to */ |
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348 | lua_pushboolean(L, 0); |
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349 | lua_pushstring(L, "invalid-gid"); |
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350 | return 2; |
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351 | } |
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352 | |
859 | 353 | /* Like POSIX's setrlimit()/getrlimit() API functions. |
354 | * | |
355 | * Syntax: | |
356 | * pposix.setrlimit( resource, soft limit, hard limit) | |
357 | * | |
358 | * Any negative limit will be replace with the current limit by an additional call of getrlimit(). | |
359 | * | |
360 | * Example usage: | |
361 | * pposix.setrlimit("NOFILE", 1000, 2000) | |
362 | */ | |
363 | int string2resource(const char *s) { | |
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364 | if (!strcmp(s, "CORE")) return RLIMIT_CORE; |
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365 | if (!strcmp(s, "CPU")) return RLIMIT_CPU; |
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366 | if (!strcmp(s, "DATA")) return RLIMIT_DATA; |
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367 | if (!strcmp(s, "FSIZE")) return RLIMIT_FSIZE; |
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368 | if (!strcmp(s, "MEMLOCK")) return RLIMIT_MEMLOCK; |
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369 | if (!strcmp(s, "NOFILE")) return RLIMIT_NOFILE; |
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370 | if (!strcmp(s, "NPROC")) return RLIMIT_NPROC; |
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371 | if (!strcmp(s, "RSS")) return RLIMIT_RSS; |
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372 | if (!strcmp(s, "STACK")) return RLIMIT_STACK; |
859 | 373 | return -1; |
374 | } | |
375 | ||
376 | int lc_setrlimit(lua_State *L) { | |
377 | int arguments = lua_gettop(L); | |
378 | int softlimit = -1; | |
379 | int hardlimit = -1; | |
380 | const char *resource = NULL; | |
381 | int rid = -1; | |
382 | if(arguments < 1 || arguments > 3) { | |
383 | lua_pushboolean(L, 0); | |
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384 | lua_pushstring(L, "incorrect-arguments"); |
859 | 385 | } |
386 | ||
387 | resource = luaL_checkstring(L, 1); | |
388 | softlimit = luaL_checkinteger(L, 2); | |
389 | hardlimit = luaL_checkinteger(L, 3); | |
390 | ||
391 | rid = string2resource(resource); | |
392 | if (rid != -1) { | |
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393 | struct rlimit lim; |
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394 | struct rlimit lim_current; |
859 | 395 | |
396 | if (softlimit < 0 || hardlimit < 0) { | |
397 | if (getrlimit(rid, &lim_current)) { | |
398 | lua_pushboolean(L, 0); | |
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399 | lua_pushstring(L, "getrlimit-failed"); |
859 | 400 | return 2; |
401 | } | |
402 | } | |
403 | ||
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404 | if (softlimit < 0) lim.rlim_cur = lim_current.rlim_cur; |
859 | 405 | else lim.rlim_cur = softlimit; |
406 | if (hardlimit < 0) lim.rlim_max = lim_current.rlim_max; | |
407 | else lim.rlim_max = hardlimit; | |
408 | ||
409 | if (setrlimit(rid, &lim)) { | |
410 | lua_pushboolean(L, 0); | |
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411 | lua_pushstring(L, "setrlimit-failed"); |
859 | 412 | return 2; |
413 | } | |
414 | } else { | |
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415 | /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */ |
859 | 416 | lua_pushboolean(L, 0); |
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417 | lua_pushstring(L, "invalid-resource"); |
859 | 418 | return 2; |
419 | } | |
420 | lua_pushboolean(L, 1); | |
421 | return 1; | |
422 | } | |
423 | ||
424 | int lc_getrlimit(lua_State *L) { | |
860 | 425 | int arguments = lua_gettop(L); |
426 | const char *resource = NULL; | |
427 | int rid = -1; | |
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428 | struct rlimit lim; |
860 | 429 | |
430 | if (arguments != 1) { | |
431 | lua_pushboolean(L, 0); | |
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432 | lua_pushstring(L, "invalid-arguments"); |
860 | 433 | return 2; |
434 | } | |
435 | ||
436 | resource = luaL_checkstring(L, 1); | |
437 | rid = string2resource(resource); | |
438 | if (rid != -1) { | |
439 | if (getrlimit(rid, &lim)) { | |
440 | lua_pushboolean(L, 0); | |
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441 | lua_pushstring(L, "getrlimit-failed."); |
860 | 442 | return 2; |
443 | } | |
444 | } else { | |
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445 | /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */ |
860 | 446 | lua_pushboolean(L, 0); |
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447 | lua_pushstring(L, "invalid-resource"); |
860 | 448 | return 2; |
449 | } | |
450 | lua_pushboolean(L, 1); | |
451 | lua_pushnumber(L, lim.rlim_cur); | |
452 | lua_pushnumber(L, lim.rlim_max); | |
453 | return 3; | |
859 | 454 | } |
455 | ||
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456 | /* Register functions */ |
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457 | |
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458 | int luaopen_util_pposix(lua_State *L) |
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459 | { |
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460 | lua_newtable(L); |
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461 | |
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462 | lua_pushcfunction(L, lc_daemonize); |
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463 | lua_setfield(L, -2, "daemonize"); |
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464 | |
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465 | lua_pushcfunction(L, lc_syslog_open); |
722
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466 | lua_setfield(L, -2, "syslog_open"); |
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467 | |
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468 | lua_pushcfunction(L, lc_syslog_close); |
722
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469 | lua_setfield(L, -2, "syslog_close"); |
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470 | |
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471 | lua_pushcfunction(L, lc_syslog_log); |
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472 | lua_setfield(L, -2, "syslog_log"); |
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473 | |
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474 | lua_pushcfunction(L, lc_syslog_setmask); |
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475 | lua_setfield(L, -2, "syslog_setminlevel"); |
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476 | |
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477 | lua_pushcfunction(L, lc_getpid); |
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478 | lua_setfield(L, -2, "getpid"); |
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479 | |
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480 | lua_pushcfunction(L, lc_getuid); |
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481 | lua_setfield(L, -2, "getuid"); |
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482 | lua_pushcfunction(L, lc_getgid); |
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483 | lua_setfield(L, -2, "getgid"); |
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484 | |
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485 | lua_pushcfunction(L, lc_setuid); |
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486 | lua_setfield(L, -2, "setuid"); |
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487 | lua_pushcfunction(L, lc_setgid); |
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488 | lua_setfield(L, -2, "setgid"); |
859 | 489 | |
490 | lua_pushcfunction(L, lc_setrlimit); | |
491 | lua_setfield(L, -2, "setrlimit"); | |
492 | ||
493 | lua_pushcfunction(L, lc_getrlimit); | |
494 | lua_setfield(L, -2, "getrlimit"); | |
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495 | |
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496 | lua_pushliteral(L, "pposix"); |
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497 | lua_setfield(L, -2, "_NAME"); |
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498 | |
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499 | lua_pushliteral(L, MODULE_VERSION); |
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500 | lua_setfield(L, -2, "_VERSION"); |
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501 | |
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502 | return 1; |
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503 | }; |