2 -- server.lua by blastbeat of the luadch project
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3 -- Re-used here under the MIT/X Consortium License
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5 -- Modifications (C) 2008-2009 Matthew Wild, Waqas Hussain
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8 -- // wrapping luadch stuff // --
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10 local use = function( what )
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13 local clean = function( tbl )
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14 for i, k in pairs( tbl ) do
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19 local log, table_concat = require ("util.logger").init("socket"), table.concat;
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20 local out_put = function (...) return log("debug", table_concat{...}); end
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21 local out_error = function (...) return log("warn", table_concat{...}); end
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22 local mem_free = collectgarbage
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24 ----------------------------------// DECLARATION //--
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28 local STAT_UNIT = 1 -- byte
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30 --// lua functions //--
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32 local type = use "type"
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33 local pairs = use "pairs"
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34 local ipairs = use "ipairs"
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35 local tostring = use "tostring"
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36 local collectgarbage = use "collectgarbage"
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41 local table = use "table"
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42 local string = use "string"
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43 local coroutine = use "coroutine"
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45 --// lua lib methods //--
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47 local os_time = os.time
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48 local os_difftime = os.difftime
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49 local table_concat = table.concat
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50 local table_remove = table.remove
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51 local string_len = string.len
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52 local string_sub = string.sub
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53 local coroutine_wrap = coroutine.wrap
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54 local coroutine_yield = coroutine.yield
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56 --// extern libs //--
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58 local luasec = select( 2, pcall( require, "ssl" ) )
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59 local luasocket = require "socket"
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61 --// extern lib methods //--
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63 local ssl_wrap = ( luasec and luasec.wrap )
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64 local socket_bind = luasocket.bind
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65 local socket_sleep = luasocket.sleep
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66 local socket_select = luasocket.select
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67 local ssl_newcontext = ( luasec and luasec.newcontext )
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85 local wrapconnection
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86 local changesettings
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99 --// simple data types //--
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104 local _timerlistlen
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109 local _selecttimeout
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118 local _checkinterval
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126 local _maxclientsperserver
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128 ----------------------------------// DEFINITION //--
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130 _server = { } -- key = port, value = table; list of listening servers
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131 _readlist = { } -- array with sockets to read from
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132 _sendlist = { } -- arrary with sockets to write to
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133 _timerlist = { } -- array of timer functions
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134 _socketlist = { } -- key = socket, value = wrapped socket (handlers)
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135 _readtimes = { } -- key = handler, value = timestamp of last data reading
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136 _writetimes = { } -- key = handler, value = timestamp of last data writing/sending
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137 _closelist = { } -- handlers to close
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139 _readlistlen = 0 -- length of readlist
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140 _sendlistlen = 0 -- length of sendlist
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141 _timerlistlen = 0 -- lenght of timerlist
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143 _sendtraffic = 0 -- some stats
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146 _selecttimeout = 1 -- timeout of socket.select
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147 _sleeptime = 0 -- time to wait at the end of every loop
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149 _maxsendlen = 51000 * 1024 -- max len of send buffer
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150 _maxreadlen = 25000 * 1024 -- max len of read buffer
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152 _checkinterval = 1200000 -- interval in secs to check idle clients
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153 _sendtimeout = 60000 -- allowed send idle time in secs
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154 _readtimeout = 6 * 60 * 60 -- allowed read idle time in secs
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156 _cleanqueue = false -- clean bufferqueue after using
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158 _maxclientsperserver = 1000
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160 ----------------------------------// PRIVATE //--
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162 wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx, maxconnections, startssl ) -- this function wraps a server
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164 maxconnections = maxconnections or _maxclientsperserver
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166 local connections = 0
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168 local dispatch, disconnect = listeners.incoming or listeners.listener, listeners.disconnect
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176 if not ssl_newcontext then
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177 out_error "luasec not found"
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180 if type( sslctx ) ~= "table" then
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181 out_error "server.lua: wrong server sslctx"
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185 ctx, err = ssl_newcontext( sslctx )
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187 err = err or "wrong sslctx parameters"
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189 file = err:match("^error loading (.-) %(");
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191 if file == "private key" then
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192 file = sslctx.key or "your private key";
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193 elseif file == "certificate" then
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194 file = sslctx.certificate or "your certificate file";
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196 local reason = err:match("%((.+)%)$") or "some reason";
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197 if reason == "Permission denied" then
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198 reason = "Check that the permissions allow Prosody to read this file.";
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199 elseif reason == "No such file or directory" then
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200 reason = "Check that the path is correct, and the file exists.";
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201 elseif reason == "system lib" then
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202 reason = "Previous error (see logs), or other system error.";
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204 reason = "Reason: "..tostring(reason or "unknown"):lower();
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206 log("error", "SSL/TLS: Failed to load %s: %s", file, reason);
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208 log("error", "SSL/TLS: Error initialising for port %d: %s", serverport, err );
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217 log("error", "Failed to listen on port %d due to SSL/TLS to SSL/TLS initialisation errors (see logs)", serverport )
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218 return nil, "Cannot start ssl, see log for details"
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222 local accept = socket.accept
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224 --// public methods of the object //--
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226 local handler = { }
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228 handler.shutdown = function( ) end
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230 handler.ssl = function( )
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233 handler.remove = function( )
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234 connections = connections - 1
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236 handler.close = function( )
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237 for _, handler in pairs( _socketlist ) do
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238 if handler.serverport == serverport then
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239 handler.disconnect( handler, "server closed" )
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240 handler.close( true )
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244 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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245 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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246 _socketlist[ socket ] = nil
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250 out_put "server.lua: closed server handler and removed sockets from list"
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252 handler.ip = function( )
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255 handler.serverport = function( )
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258 handler.socket = function( )
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261 handler.readbuffer = function( )
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262 if connections > maxconnections then
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263 out_put( "server.lua: refused new client connection: server full" )
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266 local client, err = accept( socket ) -- try to accept
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268 local ip, clientport = client:getpeername( )
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269 client:settimeout( 0 )
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270 local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx, startssl ) -- wrap new client socket
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271 if err then -- error while wrapping ssl socket
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274 connections = connections + 1
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275 out_put( "server.lua: accepted new client connection from ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
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276 return dispatch( handler )
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277 elseif err then -- maybe timeout or something else
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278 out_put( "server.lua: error with new client connection: ", tostring(err) )
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285 wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx, startssl ) -- this function wraps a client to a handler object
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287 socket:settimeout( 0 )
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289 --// local import of socket methods //--
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295 --// private closures of the object //--
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299 local dispatch = listeners.incoming or listeners.listener
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300 local disconnect = listeners.disconnect
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302 local bufferqueue = { } -- buffer array
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303 local bufferqueuelen = 0 -- end of buffer array
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309 local bufferlen = 0
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311 local noread = false
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312 local nosend = false
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314 local sendtraffic, readtraffic = 0, 0
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316 local maxsendlen = _maxsendlen
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317 local maxreadlen = _maxreadlen
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319 --// public methods of the object //--
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321 local handler = bufferqueue -- saves a table ^_^
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323 handler.dispatch = function( )
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326 handler.disconnect = function( )
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329 handler.setlistener = function( listeners )
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330 dispatch = listeners.incoming
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331 disconnect = listeners.disconnect
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333 handler.getstats = function( )
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334 return readtraffic, sendtraffic
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336 handler.ssl = function( )
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339 handler.send = function( _, data, i, j )
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340 return send( socket, data, i, j )
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342 handler.receive = function( pattern, prefix )
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343 return receive( socket, pattern, prefix )
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345 handler.shutdown = function( pattern )
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346 return shutdown( socket, pattern )
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348 handler.close = function( forced )
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349 if not handler then return true; end
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350 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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351 _readtimes[ handler ] = nil
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352 if bufferqueuelen ~= 0 then
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353 if not ( forced or fatalerror ) then
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354 handler.sendbuffer( )
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355 if bufferqueuelen ~= 0 then -- try again...
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357 handler.write = nil -- ... but no further writing allowed
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363 send( socket, table_concat( bufferqueue, "", 1, bufferqueuelen ), 1, bufferlen ) -- forced send
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366 _ = shutdown and shutdown( socket )
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368 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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369 _socketlist[ socket ] = nil
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371 _writetimes[ handler ] = nil
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372 _closelist[ handler ] = nil
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380 out_put "server.lua: closed client handler and removed socket from list"
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383 handler.ip = function( )
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386 handler.serverport = function( )
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389 handler.clientport = function( )
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392 local write = function( data )
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393 bufferlen = bufferlen + string_len( data )
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394 if bufferlen > maxsendlen then
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395 _closelist[ handler ] = "send buffer exceeded" -- cannot close the client at the moment, have to wait to the end of the cycle
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396 handler.write = idfalse -- dont write anymore
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398 elseif socket and not _sendlist[ socket ] then
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399 _sendlistlen = _sendlistlen + 1
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400 _sendlist[ _sendlistlen ] = socket
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401 _sendlist[ socket ] = _sendlistlen
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403 bufferqueuelen = bufferqueuelen + 1
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404 bufferqueue[ bufferqueuelen ] = data
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406 _writetimes[ handler ] = _writetimes[ handler ] or _currenttime
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410 handler.write = write
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411 handler.bufferqueue = function( )
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414 handler.socket = function( )
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417 handler.pattern = function( new )
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418 pattern = new or pattern
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421 handler.setsend = function ( newsend )
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422 send = newsend or send
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425 handler.bufferlen = function( readlen, sendlen )
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426 maxsendlen = sendlen or maxsendlen
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427 maxreadlen = readlen or maxreadlen
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428 return maxreadlen, maxsendlen
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430 handler.lock = function( switch )
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431 if switch == true then
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432 handler.write = idfalse
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433 local tmp = _sendlistlen
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434 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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435 _writetimes[ handler ] = nil
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436 if _sendlistlen ~= tmp then
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440 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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441 _readtimes[ handler ] = nil
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442 if _readlistlen ~= tmp then
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445 elseif switch == false then
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446 handler.write = write
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449 _readlistlen = _readlistlen + 1
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450 _readlist[ socket ] = _readlistlen
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451 _readlist[ _readlistlen ] = socket
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452 _readtimes[ handler ] = _currenttime
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459 return noread, nosend
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461 local _readbuffer = function( ) -- this function reads data
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462 local buffer, err, part = receive( socket, pattern ) -- receive buffer with "pattern"
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463 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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464 local buffer = buffer or part or ""
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465 local len = string_len( buffer )
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466 if len > maxreadlen then
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467 disconnect( handler, "receive buffer exceeded" )
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468 handler.close( true )
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471 local count = len * STAT_UNIT
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472 readtraffic = readtraffic + count
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473 _readtraffic = _readtraffic + count
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474 _readtimes[ handler ] = _currenttime
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475 --out_put( "server.lua: read data '", buffer, "', error: ", err )
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476 return dispatch( handler, buffer, err )
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477 else -- connections was closed or fatal error
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478 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " error: ", tostring(err) )
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480 disconnect( handler, err )
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481 _ = handler and handler.close( )
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485 local _sendbuffer = function( ) -- this function sends data
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486 local buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
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487 local succ, err, byte = send( socket, buffer, 1, bufferlen )
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488 local count = ( succ or byte or 0 ) * STAT_UNIT
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489 sendtraffic = sendtraffic + count
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490 _sendtraffic = _sendtraffic + count
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491 _ = _cleanqueue and clean( bufferqueue )
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492 --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
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493 if succ then -- sending succesful
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496 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
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497 _ = needtls and handler.starttls(true)
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498 _writetimes[ handler ] = nil
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499 _ = toclose and handler.close( )
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501 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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502 buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer
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503 bufferqueue[ 1 ] = buffer -- insert new buffer in queue
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505 bufferlen = bufferlen - byte
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506 _writetimes[ handler ] = _currenttime
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508 else -- connection was closed during sending or fatal error
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509 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " error: ", tostring(err) )
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511 disconnect( handler, err )
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512 _ = handler and handler.close( )
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517 if sslctx then -- ssl?
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521 local handshake = coroutine_wrap( function( client ) -- create handshake coroutine
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523 for i = 1, 10 do -- 10 handshake attemps
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524 _sendlistlen = ( wrote and removesocket( _sendlist, socket, _sendlistlen ) ) or _sendlistlen
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525 _readlistlen = ( read and removesocket( _readlist, socket, _readlistlen ) ) or _readlistlen
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526 read, wrote = nil, nil
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527 _, err = client:dohandshake( )
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529 out_put( "server.lua: ssl handshake done" )
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530 handler.readbuffer = _readbuffer -- when handshake is done, replace the handshake function with regular functions
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531 handler.sendbuffer = _sendbuffer
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532 -- return dispatch( handler )
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535 out_put( "server.lua: error during ssl handshake: ", tostring(err) )
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536 if err == "wantwrite" and not wrote then
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537 _sendlistlen = _sendlistlen + 1
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538 _sendlist[ _sendlistlen ] = client
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540 elseif err == "wantread" and not read then
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541 _readlistlen = _readlistlen + 1
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542 _readlist [ _readlistlen ] = client
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547 --coroutine_yield( handler, nil, err ) -- handshake not finished
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551 disconnect( handler, "ssl handshake failed" )
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552 _ = handler and handler.close( true ) -- forced disconnect
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553 return false -- handshake failed
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556 if startssl then -- ssl now?
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557 --out_put("server.lua: ", "starting ssl handshake")
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559 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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561 out_put( "server.lua: ssl error: ", tostring(err) )
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563 return nil, nil, err -- fatal error
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565 socket:settimeout( 0 )
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566 handler.readbuffer = handshake
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567 handler.sendbuffer = handshake
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568 handshake( socket ) -- do handshake
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570 return nil, nil, "ssl handshake failed";
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573 -- We're not automatically doing SSL, so we're not secure (yet)
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575 handler.starttls = function( now )
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577 --out_put "server.lua: we need to do tls, but delaying until later"
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581 --out_put( "server.lua: attempting to start tls on " .. tostring( socket ) )
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582 local oldsocket, err = socket
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583 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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584 --out_put( "server.lua: sslwrapped socket is " .. tostring( socket ) )
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586 out_put( "server.lua: error while starting tls on client: ", tostring(err) )
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587 return nil, err -- fatal error
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590 socket:settimeout( 0 )
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592 -- add the new socket to our system
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595 receive = socket.receive
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598 _socketlist[ socket ] = handler
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599 _readlistlen = _readlistlen + 1
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600 _readlist[ _readlistlen ] = socket
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601 _readlist[ socket ] = _readlistlen
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603 -- remove traces of the old socket
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605 _readlistlen = removesocket( _readlist, oldsocket, _readlistlen )
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606 _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen )
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607 _socketlist[ oldsocket ] = nil
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609 handler.starttls = nil
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615 handler.readbuffer = handshake
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616 handler.sendbuffer = handshake
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617 handshake( socket ) -- do handshake
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619 handler.readbuffer = _readbuffer
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620 handler.sendbuffer = _sendbuffer
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622 else -- normal connection
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624 handler.readbuffer = _readbuffer
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625 handler.sendbuffer = _sendbuffer
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629 receive = socket.receive
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630 shutdown = ( ssl and id ) or socket.shutdown
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632 _socketlist[ socket ] = handler
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633 _readlistlen = _readlistlen + 1
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634 _readlist[ _readlistlen ] = socket
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635 _readlist[ socket ] = _readlistlen
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637 return handler, socket
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643 idfalse = function( )
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647 removesocket = function( list, socket, len ) -- this function removes sockets from a list ( copied from copas )
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648 local pos = list[ socket ]
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650 list[ socket ] = nil
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651 local last = list[ len ]
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653 if last ~= socket then
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662 closesocket = function( socket )
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663 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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664 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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665 _socketlist[ socket ] = nil
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670 ----------------------------------// PUBLIC //--
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672 addserver = function( listeners, port, addr, pattern, sslctx, maxconnections, startssl ) -- this function provides a way for other scripts to reg a server
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674 --out_put("server.lua: autossl on ", port, " is ", startssl)
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675 if type( listeners ) ~= "table" then
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676 err = "invalid listener table"
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678 if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then
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679 err = "invalid port"
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680 elseif _server[ port ] then
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681 err = "listeners on port '" .. port .. "' already exist"
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682 elseif sslctx and not luasec then
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683 err = "luasec not found"
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686 out_error( "server.lua, port ", port, ": ", err )
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690 local server, err = socket_bind( addr, port )
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692 out_error( "server.lua, port ", port, ": ", err )
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695 local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx, maxconnections, startssl ) -- wrap new server socket
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696 if not handler then
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700 server:settimeout( 0 )
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701 _readlistlen = _readlistlen + 1
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702 _readlist[ _readlistlen ] = server
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703 _server[ port ] = handler
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704 _socketlist[ server ] = handler
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705 out_put( "server.lua: new server listener on '", addr, ":", port, "'" )
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709 getserver = function ( port )
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710 return _server[ port ];
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713 removeserver = function( port )
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714 local handler = _server[ port ]
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715 if not handler then
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716 return nil, "no server found on port '" .. tostring( port ) "'"
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719 _server[ port ] = nil
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723 closeall = function( )
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724 for _, handler in pairs( _socketlist ) do
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726 _socketlist[ _ ] = nil
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739 getsettings = function( )
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740 return _selecttimeout, _sleeptime, _maxsendlen, _maxreadlen, _checkinterval, _sendtimeout, _readtimeout, _cleanqueue, _maxclientsperserver
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743 changesettings = function( new )
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744 if type( new ) ~= "table" then
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745 return nil, "invalid settings table"
\r
747 _selecttimeout = tonumber( new.timeout ) or _selecttimeout
\r
748 _sleeptime = tonumber( new.sleeptime ) or _sleeptime
\r
749 _maxsendlen = tonumber( new.maxsendlen ) or _maxsendlen
\r
750 _maxreadlen = tonumber( new.maxreadlen ) or _maxreadlen
\r
751 _checkinterval = tonumber( new.checkinterval ) or _checkinterval
\r
752 _sendtimeout = tonumber( new.sendtimeout ) or _sendtimeout
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753 _readtimeout = tonumber( new.readtimeout ) or _readtimeout
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754 _cleanqueue = new.cleanqueue
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755 _maxclientsperserver = new._maxclientsperserver or _maxclientsperserver
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759 addtimer = function( listener )
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760 if type( listener ) ~= "function" then
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761 return nil, "invalid listener function"
\r
763 _timerlistlen = _timerlistlen + 1
\r
764 _timerlist[ _timerlistlen ] = listener
\r
768 stats = function( )
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769 return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
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772 local dontstop = true; -- thinking about tomorrow, ...
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774 setquitting = function (quit)
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775 dontstop = not quit;
\r
779 loop = function( ) -- this is the main loop of the program
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781 local read, write, err = socket_select( _readlist, _sendlist, _selecttimeout )
\r
782 for i, socket in ipairs( write ) do -- send data waiting in writequeues
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783 local handler = _socketlist[ socket ]
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785 handler.sendbuffer( )
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787 closesocket( socket )
\r
788 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
\r
791 for i, socket in ipairs( read ) do -- receive data
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792 local handler = _socketlist[ socket ]
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794 handler.readbuffer( )
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796 closesocket( socket )
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797 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
\r
800 for handler, err in pairs( _closelist ) do
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801 handler.disconnect( )( handler, err )
\r
802 handler.close( true ) -- forced disconnect
\r
804 clean( _closelist )
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805 _currenttime = os_time( )
\r
806 if os_difftime( _currenttime - _timer ) >= 1 then
\r
807 for i = 1, _timerlistlen do
\r
808 _timerlist[ i ]( ) -- fire timers
\r
810 _timer = _currenttime
\r
812 socket_sleep( _sleeptime ) -- wait some time
\r
813 --collectgarbage( )
\r
818 --// EXPERIMENTAL //--
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820 local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx, startssl )
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821 local handler = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx, startssl )
\r
822 _socketlist[ socket ] = handler
\r
823 _sendlistlen = _sendlistlen + 1
\r
824 _sendlist[ _sendlistlen ] = socket
\r
825 _sendlist[ socket ] = _sendlistlen
\r
826 return handler, socket
\r
829 local addclient = function( address, port, listeners, pattern, sslctx, startssl )
\r
830 local client, err = luasocket.tcp( )
\r
834 client:settimeout( 0 )
\r
835 _, err = client:connect( address, port )
\r
836 if err then -- try again
\r
837 local handler = wrapclient( client, address, port, listeners )
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839 wrapconnection( nil, listeners, client, address, port, "clientport", pattern, sslctx, startssl )
\r
843 --// EXPERIMENTAL //--
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845 ----------------------------------// BEGIN //--
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847 use "setmetatable" ( _socketlist, { __mode = "k" } )
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848 use "setmetatable" ( _readtimes, { __mode = "k" } )
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849 use "setmetatable" ( _writetimes, { __mode = "k" } )
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851 _timer = os_time( )
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852 _starttime = os_time( )
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854 addtimer( function( )
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855 local difftime = os_difftime( _currenttime - _starttime )
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856 if difftime > _checkinterval then
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857 _starttime = _currenttime
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858 for handler, timestamp in pairs( _writetimes ) do
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859 if os_difftime( _currenttime - timestamp ) > _sendtimeout then
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860 --_writetimes[ handler ] = nil
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861 handler.disconnect( )( handler, "send timeout" )
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862 handler.close( true ) -- forced disconnect
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865 for handler, timestamp in pairs( _readtimes ) do
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866 if os_difftime( _currenttime - timestamp ) > _readtimeout then
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867 --_readtimes[ handler ] = nil
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868 handler.disconnect( )( handler, "read timeout" )
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869 handler.close( ) -- forced disconnect?
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876 ----------------------------------// PUBLIC INTERFACE //--
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880 addclient = addclient,
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881 wrapclient = wrapclient,
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885 closeall = closeall,
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886 addtimer = addtimer,
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887 addserver = addserver,
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888 getserver = getserver,
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889 getsettings = getsettings,
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890 setquitting = setquitting,
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891 removeserver = removeserver,
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892 changesettings = changesettings,
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