Software / code / prosody
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util-src/pposix.c @ 1054:084d265b37cf
Merge with 0.4 branch
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Thu, 23 Apr 2009 21:06:08 +0100 |
| parent | 896:2c0b9e3c11c3 |
| child | 1195:6b91a2b39680 |
| rev | line source |
|---|---|
| 896 | 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 "0.3.0" |
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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 |
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29 #include <string.h> |
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30 #include <errno.h> |
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31 #include "lua.h" |
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32 #include "lauxlib.h" |
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33 |
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34 /* Daemonization support */ |
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35 |
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36 static int lc_daemonize(lua_State *L) |
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37 { |
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38 |
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39 pid_t pid; |
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40 |
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41 if ( getppid() == 1 ) |
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42 { |
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43 lua_pushboolean(L, 0); |
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44 lua_pushstring(L, "already-daemonized"); |
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45 return 2; |
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46 } |
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47 |
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48 /* Attempt initial fork */ |
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49 if((pid = fork()) < 0) |
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50 { |
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51 /* Forking failed */ |
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52 lua_pushboolean(L, 0); |
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53 lua_pushstring(L, "fork-failed"); |
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54 return 2; |
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55 } |
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56 else if(pid != 0) |
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57 { |
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58 /* We are the parent process */ |
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59 lua_pushboolean(L, 1); |
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60 lua_pushnumber(L, pid); |
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61 return 2; |
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62 } |
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63 |
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64 /* and we are the child process */ |
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65 if(setsid() == -1) |
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66 { |
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67 /* We failed to become session leader */ |
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68 /* (we probably already were) */ |
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69 lua_pushboolean(L, 0); |
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70 lua_pushstring(L, "setsid-failed"); |
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71 return 2; |
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72 } |
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73 |
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74 /* Close stdin, stdout, stderr */ |
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75 /* close(0); |
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76 close(1); |
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77 close(2); |
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78 */ |
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79 /* Final fork, use it wisely */ |
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80 if(fork()) |
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81 exit(0); |
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82 |
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83 /* Show's over, let's continue */ |
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84 lua_pushboolean(L, 1); |
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85 lua_pushnil(L); |
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86 return 2; |
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87 } |
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88 |
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89 /* Syslog support */ |
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90 |
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91 const char * const facility_strings[] = { |
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92 "auth", |
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93 "authpriv", |
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94 "cron", |
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95 "daemon", |
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96 "ftp", |
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97 "kern", |
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98 "local0", |
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99 "local1", |
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100 "local2", |
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101 "local3", |
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102 "local4", |
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103 "local5", |
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104 "local6", |
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105 "local7", |
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106 "lpr", |
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107 "mail", |
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108 "syslog", |
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109 "user", |
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110 "uucp", |
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111 NULL |
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112 }; |
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113 int facility_constants[] = { |
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114 LOG_AUTH, |
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115 LOG_AUTHPRIV, |
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116 LOG_CRON, |
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117 LOG_DAEMON, |
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118 LOG_FTP, |
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119 LOG_KERN, |
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120 LOG_LOCAL0, |
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121 LOG_LOCAL1, |
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122 LOG_LOCAL2, |
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123 LOG_LOCAL3, |
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124 LOG_LOCAL4, |
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125 LOG_LOCAL5, |
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126 LOG_LOCAL6, |
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127 LOG_LOCAL7, |
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128 LOG_LPR, |
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129 LOG_MAIL, |
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130 LOG_NEWS, |
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131 LOG_SYSLOG, |
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132 LOG_USER, |
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133 LOG_UUCP, |
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134 -1 |
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135 }; |
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136 |
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137 /* " |
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138 The parameter ident in the call of openlog() is probably stored as-is. |
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139 Thus, if the string it points to is changed, syslog() may start |
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140 prepending the changed string, and if the string it points to ceases to |
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141 exist, the results are undefined. Most portable is to use a string |
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142 constant. |
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143 " -- syslog manpage |
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144 */ |
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145 char* syslog_ident = NULL; |
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146 |
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147 int lc_syslog_open(lua_State* L) |
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148 { |
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149 int facility = luaL_checkoption(L, 2, "daemon", facility_strings); |
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150 facility = facility_constants[facility]; |
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151 |
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152 luaL_checkstring(L, 1); |
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153 |
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154 if(syslog_ident) |
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155 free(syslog_ident); |
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156 |
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157 syslog_ident = strdup(lua_tostring(L, 1)); |
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158 |
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159 openlog(syslog_ident, LOG_PID, facility); |
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160 return 0; |
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161 } |
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162 |
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163 const char * const level_strings[] = { |
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164 "debug", |
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165 "info", |
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166 "notice", |
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167 "warn", |
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168 "error", |
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169 NULL |
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170 }; |
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171 int level_constants[] = { |
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172 LOG_DEBUG, |
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173 LOG_INFO, |
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174 LOG_NOTICE, |
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175 LOG_WARNING, |
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176 LOG_EMERG, |
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177 -1 |
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178 }; |
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179 int lc_syslog_log(lua_State* L) |
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180 { |
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181 int level = luaL_checkoption(L, 1, "notice", level_strings); |
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182 level = level_constants[level]; |
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183 |
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184 luaL_checkstring(L, 2); |
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185 |
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186 syslog(level, "%s", lua_tostring(L, 2)); |
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187 return 0; |
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188 } |
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189 |
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190 int lc_syslog_close(lua_State* L) |
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191 { |
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192 closelog(); |
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193 if(syslog_ident) |
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194 { |
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195 free(syslog_ident); |
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196 syslog_ident = NULL; |
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197 } |
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198 return 0; |
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199 } |
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200 |
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201 int lc_syslog_setmask(lua_State* L) |
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202 { |
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203 int level_idx = luaL_checkoption(L, 1, "notice", level_strings); |
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204 int mask = 0; |
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205 do |
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206 { |
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207 mask |= LOG_MASK(level_constants[level_idx]); |
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208 } while (++level_idx<=4); |
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209 |
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210 setlogmask(mask); |
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211 return 0; |
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212 } |
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213 |
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214 /* getpid */ |
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215 |
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216 int lc_getpid(lua_State* L) |
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217 { |
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218 lua_pushinteger(L, getpid()); |
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219 return 1; |
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220 } |
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221 |
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222 /* UID/GID functions */ |
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223 |
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224 int lc_getuid(lua_State* L) |
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225 { |
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226 lua_pushinteger(L, getuid()); |
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227 return 1; |
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228 } |
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229 |
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230 int lc_getgid(lua_State* L) |
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231 { |
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232 lua_pushinteger(L, getgid()); |
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233 return 1; |
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234 } |
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235 |
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236 int lc_setuid(lua_State* L) |
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237 { |
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238 int uid = -1; |
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239 if(lua_gettop(L) < 1) |
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240 return 0; |
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241 if(!lua_isnumber(L, 1) && lua_tostring(L, 1)) |
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242 { |
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243 /* Passed UID is actually a string, so look up the UID */ |
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244 struct passwd *p; |
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245 p = getpwnam(lua_tostring(L, 1)); |
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246 if(!p) |
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247 { |
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248 lua_pushboolean(L, 0); |
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249 lua_pushstring(L, "no-such-user"); |
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250 return 2; |
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251 } |
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252 uid = p->pw_uid; |
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253 } |
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254 else |
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255 { |
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256 uid = lua_tonumber(L, 1); |
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257 } |
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258 |
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259 if(uid>-1) |
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260 { |
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261 /* Ok, attempt setuid */ |
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262 errno = 0; |
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263 if(setuid(uid)) |
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264 { |
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265 /* Fail */ |
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266 lua_pushboolean(L, 0); |
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267 switch(errno) |
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268 { |
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269 case EINVAL: |
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270 lua_pushstring(L, "invalid-uid"); |
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271 break; |
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272 case EPERM: |
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273 lua_pushstring(L, "permission-denied"); |
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274 break; |
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275 default: |
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276 lua_pushstring(L, "unknown-error"); |
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277 } |
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278 return 2; |
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279 } |
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280 else |
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281 { |
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282 /* Success! */ |
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283 lua_pushboolean(L, 1); |
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284 return 1; |
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285 } |
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286 } |
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287 |
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288 /* Seems we couldn't find a valid UID to switch to */ |
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289 lua_pushboolean(L, 0); |
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290 lua_pushstring(L, "invalid-uid"); |
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291 return 2; |
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292 } |
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293 |
| 859 | 294 /* Like POSIX's setrlimit()/getrlimit() API functions. |
| 295 * | |
| 296 * Syntax: | |
| 297 * pposix.setrlimit( resource, soft limit, hard limit) | |
| 298 * | |
| 299 * Any negative limit will be replace with the current limit by an additional call of getrlimit(). | |
| 300 * | |
| 301 * Example usage: | |
| 302 * pposix.setrlimit("NOFILE", 1000, 2000) | |
| 303 */ | |
| 304 int string2resource(const char *s) { | |
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305 if (!strcmp(s, "CORE")) return RLIMIT_CORE; |
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306 if (!strcmp(s, "CPU")) return RLIMIT_CPU; |
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307 if (!strcmp(s, "DATA")) return RLIMIT_DATA; |
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308 if (!strcmp(s, "FSIZE")) return RLIMIT_FSIZE; |
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309 if (!strcmp(s, "MEMLOCK")) return RLIMIT_MEMLOCK; |
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310 if (!strcmp(s, "NOFILE")) return RLIMIT_NOFILE; |
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311 if (!strcmp(s, "NPROC")) return RLIMIT_NPROC; |
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312 if (!strcmp(s, "RSS")) return RLIMIT_RSS; |
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313 if (!strcmp(s, "STACK")) return RLIMIT_STACK; |
| 859 | 314 return -1; |
| 315 } | |
| 316 | |
| 317 int lc_setrlimit(lua_State *L) { | |
| 318 int arguments = lua_gettop(L); | |
| 319 int softlimit = -1; | |
| 320 int hardlimit = -1; | |
| 321 const char *resource = NULL; | |
| 322 int rid = -1; | |
| 323 if(arguments < 1 || arguments > 3) { | |
| 324 lua_pushboolean(L, 0); | |
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325 lua_pushstring(L, "incorrect-arguments"); |
| 859 | 326 } |
| 327 | |
| 328 resource = luaL_checkstring(L, 1); | |
| 329 softlimit = luaL_checkinteger(L, 2); | |
| 330 hardlimit = luaL_checkinteger(L, 3); | |
| 331 | |
| 332 rid = string2resource(resource); | |
| 333 if (rid != -1) { | |
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334 struct rlimit lim; |
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335 struct rlimit lim_current; |
| 859 | 336 |
| 337 if (softlimit < 0 || hardlimit < 0) { | |
| 338 if (getrlimit(rid, &lim_current)) { | |
| 339 lua_pushboolean(L, 0); | |
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340 lua_pushstring(L, "getrlimit-failed"); |
| 859 | 341 return 2; |
| 342 } | |
| 343 } | |
| 344 | |
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345 if (softlimit < 0) lim.rlim_cur = lim_current.rlim_cur; |
| 859 | 346 else lim.rlim_cur = softlimit; |
| 347 if (hardlimit < 0) lim.rlim_max = lim_current.rlim_max; | |
| 348 else lim.rlim_max = hardlimit; | |
| 349 | |
| 350 if (setrlimit(rid, &lim)) { | |
| 351 lua_pushboolean(L, 0); | |
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352 lua_pushstring(L, "setrlimit-failed"); |
| 859 | 353 return 2; |
| 354 } | |
| 355 } else { | |
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356 /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */ |
| 859 | 357 lua_pushboolean(L, 0); |
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358 lua_pushstring(L, "invalid-resource"); |
| 859 | 359 return 2; |
| 360 } | |
| 361 lua_pushboolean(L, 1); | |
| 362 return 1; | |
| 363 } | |
| 364 | |
| 365 int lc_getrlimit(lua_State *L) { | |
| 860 | 366 int arguments = lua_gettop(L); |
| 367 const char *resource = NULL; | |
| 368 int rid = -1; | |
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369 struct rlimit lim; |
| 860 | 370 |
| 371 if (arguments != 1) { | |
| 372 lua_pushboolean(L, 0); | |
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373 lua_pushstring(L, "invalid-arguments"); |
| 860 | 374 return 2; |
| 375 } | |
| 376 | |
| 377 resource = luaL_checkstring(L, 1); | |
| 378 rid = string2resource(resource); | |
| 379 if (rid != -1) { | |
| 380 if (getrlimit(rid, &lim)) { | |
| 381 lua_pushboolean(L, 0); | |
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382 lua_pushstring(L, "getrlimit-failed."); |
| 860 | 383 return 2; |
| 384 } | |
| 385 } else { | |
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386 /* Unsupported resoucrce. Sorry I'm pretty limited by POSIX standard. */ |
| 860 | 387 lua_pushboolean(L, 0); |
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388 lua_pushstring(L, "invalid-resource"); |
| 860 | 389 return 2; |
| 390 } | |
| 391 lua_pushboolean(L, 1); | |
| 392 lua_pushnumber(L, lim.rlim_cur); | |
| 393 lua_pushnumber(L, lim.rlim_max); | |
| 394 return 3; | |
| 859 | 395 } |
| 396 | |
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397 /* Register functions */ |
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398 |
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399 int luaopen_util_pposix(lua_State *L) |
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400 { |
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401 lua_newtable(L); |
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402 |
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403 lua_pushcfunction(L, lc_daemonize); |
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404 lua_setfield(L, -2, "daemonize"); |
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405 |
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406 lua_pushcfunction(L, lc_syslog_open); |
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407 lua_setfield(L, -2, "syslog_open"); |
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408 |
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409 lua_pushcfunction(L, lc_syslog_close); |
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410 lua_setfield(L, -2, "syslog_close"); |
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411 |
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412 lua_pushcfunction(L, lc_syslog_log); |
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413 lua_setfield(L, -2, "syslog_log"); |
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414 |
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415 lua_pushcfunction(L, lc_syslog_setmask); |
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416 lua_setfield(L, -2, "syslog_setminlevel"); |
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417 |
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418 lua_pushcfunction(L, lc_getpid); |
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419 lua_setfield(L, -2, "getpid"); |
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420 |
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421 lua_pushcfunction(L, lc_getuid); |
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422 lua_setfield(L, -2, "getuid"); |
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423 |
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424 lua_pushcfunction(L, lc_setuid); |
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425 lua_setfield(L, -2, "setuid"); |
| 859 | 426 |
| 427 lua_pushcfunction(L, lc_setrlimit); | |
| 428 lua_setfield(L, -2, "setrlimit"); | |
| 429 | |
| 430 lua_pushcfunction(L, lc_getrlimit); | |
| 431 lua_setfield(L, -2, "getrlimit"); | |
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432 |
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433 lua_pushliteral(L, "pposix"); |
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434 lua_setfield(L, -2, "_NAME"); |
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435 |
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436 lua_pushliteral(L, MODULE_VERSION); |
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437 lua_setfield(L, -2, "_VERSION"); |
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438 |
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439 return 1; |
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440 }; |
