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 _maxsslhandshake = 30 -- max handshake round-trips
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161 ----------------------------------// PRIVATE //--
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163 wrapserver = function( listeners, socket, ip, serverport, pattern, sslctx, maxconnections, startssl ) -- this function wraps a server
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165 maxconnections = maxconnections or _maxclientsperserver
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167 local connections = 0
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169 local dispatch, disconnect = listeners.incoming or listeners.listener, listeners.disconnect
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177 if not ssl_newcontext then
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178 out_error "luasec not found"
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181 if type( sslctx ) ~= "table" then
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182 out_error "server.lua: wrong server sslctx"
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186 ctx, err = ssl_newcontext( sslctx )
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188 err = err or "wrong sslctx parameters"
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190 file = err:match("^error loading (.-) %(");
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192 if file == "private key" then
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193 file = sslctx.key or "your private key";
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194 elseif file == "certificate" then
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195 file = sslctx.certificate or "your certificate file";
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197 local reason = err:match("%((.+)%)$") or "some reason";
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198 if reason == "Permission denied" then
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199 reason = "Check that the permissions allow Prosody to read this file.";
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200 elseif reason == "No such file or directory" then
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201 reason = "Check that the path is correct, and the file exists.";
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202 elseif reason == "system lib" then
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203 reason = "Previous error (see logs), or other system error.";
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205 reason = "Reason: "..tostring(reason or "unknown"):lower();
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207 log("error", "SSL/TLS: Failed to load %s: %s", file, reason);
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209 log("error", "SSL/TLS: Error initialising for port %d: %s", serverport, err );
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218 log("error", "Failed to listen on port %d due to SSL/TLS to SSL/TLS initialisation errors (see logs)", serverport )
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219 return nil, "Cannot start ssl, see log for details"
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223 local accept = socket.accept
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225 --// public methods of the object //--
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227 local handler = { }
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229 handler.shutdown = function( ) end
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231 handler.ssl = function( )
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234 handler.sslctx = function( )
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237 handler.remove = function( )
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238 connections = connections - 1
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240 handler.close = function( )
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241 for _, handler in pairs( _socketlist ) do
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242 if handler.serverport == serverport then
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243 handler.disconnect( handler, "server closed" )
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244 handler.close( true )
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248 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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249 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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250 _socketlist[ socket ] = nil
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254 out_put "server.lua: closed server handler and removed sockets from list"
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256 handler.ip = function( )
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259 handler.serverport = function( )
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262 handler.socket = function( )
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265 handler.readbuffer = function( )
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266 if connections > maxconnections then
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267 out_put( "server.lua: refused new client connection: server full" )
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270 local client, err = accept( socket ) -- try to accept
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272 local ip, clientport = client:getpeername( )
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273 client:settimeout( 0 )
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274 local handler, client, err = wrapconnection( handler, listeners, client, ip, serverport, clientport, pattern, sslctx, startssl ) -- wrap new client socket
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275 if err then -- error while wrapping ssl socket
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278 connections = connections + 1
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279 out_put( "server.lua: accepted new client connection from ", tostring(ip), ":", tostring(clientport), " to ", tostring(serverport))
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280 return dispatch( handler )
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281 elseif err then -- maybe timeout or something else
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282 out_put( "server.lua: error with new client connection: ", tostring(err) )
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289 wrapconnection = function( server, listeners, socket, ip, serverport, clientport, pattern, sslctx, startssl ) -- this function wraps a client to a handler object
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291 socket:settimeout( 0 )
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293 --// local import of socket methods //--
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299 --// private closures of the object //--
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303 local dispatch = listeners.incoming or listeners.listener
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304 local status = listeners.status
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305 local disconnect = listeners.disconnect
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307 local bufferqueue = { } -- buffer array
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308 local bufferqueuelen = 0 -- end of buffer array
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314 local bufferlen = 0
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316 local noread = false
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317 local nosend = false
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319 local sendtraffic, readtraffic = 0, 0
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321 local maxsendlen = _maxsendlen
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322 local maxreadlen = _maxreadlen
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324 --// public methods of the object //--
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326 local handler = bufferqueue -- saves a table ^_^
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328 handler.dispatch = function( )
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331 handler.disconnect = function( )
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334 handler.setlistener = function( listeners )
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335 dispatch = listeners.incoming
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336 disconnect = listeners.disconnect
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338 handler.getstats = function( )
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339 return readtraffic, sendtraffic
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341 handler.ssl = function( )
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344 handler.sslctx = function ( )
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347 handler.send = function( _, data, i, j )
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348 return send( socket, data, i, j )
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350 handler.receive = function( pattern, prefix )
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351 return receive( socket, pattern, prefix )
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353 handler.shutdown = function( pattern )
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354 return shutdown( socket, pattern )
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356 handler.close = function( forced )
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357 if not handler then return true; end
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358 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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359 _readtimes[ handler ] = nil
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360 if bufferqueuelen ~= 0 then
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361 if not ( forced or fatalerror ) then
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362 handler.sendbuffer( )
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363 if bufferqueuelen ~= 0 then -- try again...
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365 handler.write = nil -- ... but no further writing allowed
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371 send( socket, table_concat( bufferqueue, "", 1, bufferqueuelen ), 1, bufferlen ) -- forced send
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375 _ = shutdown and shutdown( socket )
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377 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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378 _socketlist[ socket ] = nil
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381 out_put "server.lua: socket already closed"
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384 _writetimes[ handler ] = nil
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385 _closelist[ handler ] = nil
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391 out_put "server.lua: closed client handler and removed socket from list"
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394 handler.ip = function( )
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397 handler.serverport = function( )
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400 handler.clientport = function( )
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403 local write = function( data )
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404 bufferlen = bufferlen + string_len( data )
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405 if bufferlen > maxsendlen then
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406 _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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407 handler.write = idfalse -- dont write anymore
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409 elseif socket and not _sendlist[ socket ] then
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410 _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
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412 bufferqueuelen = bufferqueuelen + 1
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413 bufferqueue[ bufferqueuelen ] = data
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415 _writetimes[ handler ] = _writetimes[ handler ] or _currenttime
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419 handler.write = write
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420 handler.bufferqueue = function( )
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423 handler.socket = function( )
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426 handler.pattern = function( new )
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427 pattern = new or pattern
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430 handler.setsend = function ( newsend )
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431 send = newsend or send
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434 handler.bufferlen = function( readlen, sendlen )
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435 maxsendlen = sendlen or maxsendlen
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436 maxreadlen = readlen or maxreadlen
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437 return maxreadlen, maxsendlen
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439 handler.lock = function( switch )
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440 if switch == true then
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441 handler.write = idfalse
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442 local tmp = _sendlistlen
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443 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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444 _writetimes[ handler ] = nil
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445 if _sendlistlen ~= tmp then
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449 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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450 _readtimes[ handler ] = nil
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451 if _readlistlen ~= tmp then
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454 elseif switch == false then
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455 handler.write = write
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458 _readlistlen = addsocket(_readlist, socket, _readlistlen)
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459 _readtimes[ handler ] = _currenttime
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466 return noread, nosend
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468 local _readbuffer = function( ) -- this function reads data
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469 local buffer, err, part = receive( socket, pattern ) -- receive buffer with "pattern"
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470 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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471 local buffer = buffer or part or ""
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472 local len = string_len( buffer )
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473 if len > maxreadlen then
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474 disconnect( handler, "receive buffer exceeded" )
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475 handler.close( true )
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478 local count = len * STAT_UNIT
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479 readtraffic = readtraffic + count
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480 _readtraffic = _readtraffic + count
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481 _readtimes[ handler ] = _currenttime
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482 --out_put( "server.lua: read data '", buffer:gsub("[^%w%p ]", "."), "', error: ", err )
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483 return dispatch( handler, buffer, err )
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484 else -- connections was closed or fatal error
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485 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " read error: ", tostring(err) )
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487 disconnect( handler, err )
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488 _ = handler and handler.close( )
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492 local _sendbuffer = function( ) -- this function sends data
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493 local succ, err, byte, buffer, count;
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496 buffer = table_concat( bufferqueue, "", 1, bufferqueuelen )
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497 succ, err, byte = send( socket, buffer, 1, bufferlen )
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498 count = ( succ or byte or 0 ) * STAT_UNIT
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499 sendtraffic = sendtraffic + count
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500 _sendtraffic = _sendtraffic + count
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501 _ = _cleanqueue and clean( bufferqueue )
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502 --out_put( "server.lua: sended '", buffer, "', bytes: ", tostring(succ), ", error: ", tostring(err), ", part: ", tostring(byte), ", to: ", tostring(ip), ":", tostring(clientport) )
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504 succ, err, count = false, "closed", 0;
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506 if succ then -- sending succesful
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509 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen ) -- delete socket from writelist
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510 _ = needtls and handler.starttls(true)
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511 _writetimes[ handler ] = nil
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512 _ = toclose and handler.close( )
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514 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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515 buffer = string_sub( buffer, byte + 1, bufferlen ) -- new buffer
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516 bufferqueue[ 1 ] = buffer -- insert new buffer in queue
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518 bufferlen = bufferlen - byte
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519 _writetimes[ handler ] = _currenttime
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521 else -- connection was closed during sending or fatal error
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522 out_put( "server.lua: client ", tostring(ip), ":", tostring(clientport), " write error: ", tostring(err) )
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524 disconnect( handler, err )
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525 _ = handler and handler.close( )
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532 function handler.set_sslctx(new_sslctx)
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534 sslctx = new_sslctx;
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537 handshake = coroutine_wrap( function( client ) -- create handshake coroutine
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539 for i = 1, _maxsslhandshake do
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540 _sendlistlen = ( wrote and removesocket( _sendlist, client, _sendlistlen ) ) or _sendlistlen
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541 _readlistlen = ( read and removesocket( _readlist, client, _readlistlen ) ) or _readlistlen
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542 read, wrote = nil, nil
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543 _, err = client:dohandshake( )
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545 out_put( "server.lua: ssl handshake done" )
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546 handler.readbuffer = _readbuffer -- when handshake is done, replace the handshake function with regular functions
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547 handler.sendbuffer = _sendbuffer
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548 _ = status and status( handler, "ssl-handshake-complete" )
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549 _readlistlen = addsocket(_readlist, client, _readlistlen)
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552 out_put( "server.lua: error during ssl handshake: ", tostring(err) )
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553 if err == "wantwrite" and not wrote then
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554 _sendlistlen = addsocket(_sendlist, client, _sendlistlen)
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556 elseif err == "wantread" and not read then
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557 _readlistlen = addsocket(_readlist, client, _readlistlen)
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562 --coroutine_yield( handler, nil, err ) -- handshake not finished
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566 disconnect( handler, "ssl handshake failed" )
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567 _ = handler and handler.close( true ) -- forced disconnect
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568 return false -- handshake failed
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572 if sslctx then -- ssl?
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573 handler.set_sslctx(sslctx);
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574 if startssl then -- ssl now?
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575 --out_put("server.lua: ", "starting ssl handshake")
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577 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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579 out_put( "server.lua: ssl error: ", tostring(err) )
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581 return nil, nil, err -- fatal error
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583 socket:settimeout( 0 )
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584 handler.readbuffer = handshake
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585 handler.sendbuffer = handshake
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586 handshake( socket ) -- do handshake
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588 return nil, nil, "ssl handshake failed";
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591 -- We're not automatically doing SSL, so we're not secure (yet)
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593 handler.starttls = function( now )
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595 --out_put "server.lua: we need to do tls, but delaying until later"
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599 --out_put( "server.lua: attempting to start tls on " .. tostring( socket ) )
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600 local oldsocket, err = socket
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601 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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602 --out_put( "server.lua: sslwrapped socket is " .. tostring( socket ) )
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604 out_put( "server.lua: error while starting tls on client: ", tostring(err) )
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605 return nil, err -- fatal error
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608 socket:settimeout( 0 )
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610 -- add the new socket to our system
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613 receive = socket.receive
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616 _socketlist[ socket ] = handler
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617 _readlistlen = addsocket(_readlist, socket, _readlistlen)
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619 -- remove traces of the old socket
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621 _readlistlen = removesocket( _readlist, oldsocket, _readlistlen )
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622 _sendlistlen = removesocket( _sendlist, oldsocket, _sendlistlen )
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623 _socketlist[ oldsocket ] = nil
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625 handler.starttls = nil
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631 handler.readbuffer = handshake
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632 handler.sendbuffer = handshake
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633 handshake( socket ) -- do handshake
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635 handler.readbuffer = _readbuffer
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636 handler.sendbuffer = _sendbuffer
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638 else -- normal connection
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640 handler.readbuffer = _readbuffer
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641 handler.sendbuffer = _sendbuffer
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645 receive = socket.receive
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646 shutdown = ( ssl and id ) or socket.shutdown
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648 _socketlist[ socket ] = handler
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649 _readlistlen = addsocket(_readlist, socket, _readlistlen)
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651 return handler, socket
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657 idfalse = function( )
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661 addsocket = function( list, socket, len )
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662 if not list[ socket ] then
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664 list[ len ] = socket
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665 list[ socket ] = len
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670 removesocket = function( list, socket, len ) -- this function removes sockets from a list ( copied from copas )
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671 local pos = list[ socket ]
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673 list[ socket ] = nil
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674 local last = list[ len ]
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676 if last ~= socket then
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685 closesocket = function( socket )
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686 _sendlistlen = removesocket( _sendlist, socket, _sendlistlen )
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687 _readlistlen = removesocket( _readlist, socket, _readlistlen )
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688 _socketlist[ socket ] = nil
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693 ----------------------------------// PUBLIC //--
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695 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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697 --out_put("server.lua: autossl on ", port, " is ", startssl)
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698 if type( listeners ) ~= "table" then
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699 err = "invalid listener table"
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701 if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then
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702 err = "invalid port"
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703 elseif _server[ port ] then
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704 err = "listeners on port '" .. port .. "' already exist"
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705 elseif sslctx and not luasec then
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706 err = "luasec not found"
\r
709 out_error( "server.lua, port ", port, ": ", err )
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713 local server, err = socket_bind( addr, port )
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715 out_error( "server.lua, port ", port, ": ", err )
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718 local handler, err = wrapserver( listeners, server, addr, port, pattern, sslctx, maxconnections, startssl ) -- wrap new server socket
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719 if not handler then
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723 server:settimeout( 0 )
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724 _readlistlen = addsocket(_readlist, server, _readlistlen)
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725 _server[ port ] = handler
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726 _socketlist[ server ] = handler
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727 out_put( "server.lua: new server listener on '", addr, ":", port, "'" )
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731 getserver = function ( port )
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732 return _server[ port ];
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735 removeserver = function( port )
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736 local handler = _server[ port ]
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737 if not handler then
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738 return nil, "no server found on port '" .. tostring( port ) .. "'"
\r
741 _server[ port ] = nil
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745 closeall = function( )
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746 for _, handler in pairs( _socketlist ) do
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748 _socketlist[ _ ] = nil
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761 getsettings = function( )
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762 return _selecttimeout, _sleeptime, _maxsendlen, _maxreadlen, _checkinterval, _sendtimeout, _readtimeout, _cleanqueue, _maxclientsperserver, _maxsslhandshake
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765 changesettings = function( new )
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766 if type( new ) ~= "table" then
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767 return nil, "invalid settings table"
\r
769 _selecttimeout = tonumber( new.timeout ) or _selecttimeout
\r
770 _sleeptime = tonumber( new.sleeptime ) or _sleeptime
\r
771 _maxsendlen = tonumber( new.maxsendlen ) or _maxsendlen
\r
772 _maxreadlen = tonumber( new.maxreadlen ) or _maxreadlen
\r
773 _checkinterval = tonumber( new.checkinterval ) or _checkinterval
\r
774 _sendtimeout = tonumber( new.sendtimeout ) or _sendtimeout
\r
775 _readtimeout = tonumber( new.readtimeout ) or _readtimeout
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776 _cleanqueue = new.cleanqueue
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777 _maxclientsperserver = new._maxclientsperserver or _maxclientsperserver
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778 _maxsslhandshake = new._maxsslhandshake or _maxsslhandshake
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782 addtimer = function( listener )
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783 if type( listener ) ~= "function" then
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784 return nil, "invalid listener function"
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786 _timerlistlen = _timerlistlen + 1
\r
787 _timerlist[ _timerlistlen ] = listener
\r
791 stats = function( )
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792 return _readtraffic, _sendtraffic, _readlistlen, _sendlistlen, _timerlistlen
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795 local dontstop = true; -- thinking about tomorrow, ...
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797 setquitting = function (quit)
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798 dontstop = not quit;
\r
802 loop = function( ) -- this is the main loop of the program
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804 local read, write, err = socket_select( _readlist, _sendlist, _selecttimeout )
\r
805 for i, socket in ipairs( write ) do -- send data waiting in writequeues
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806 local handler = _socketlist[ socket ]
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808 handler.sendbuffer( )
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810 closesocket( socket )
\r
811 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
\r
814 for i, socket in ipairs( read ) do -- receive data
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815 local handler = _socketlist[ socket ]
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817 handler.readbuffer( )
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819 closesocket( socket )
\r
820 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
\r
823 for handler, err in pairs( _closelist ) do
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824 handler.disconnect( )( handler, err )
\r
825 handler.close( true ) -- forced disconnect
\r
827 clean( _closelist )
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828 _currenttime = os_time( )
\r
829 if os_difftime( _currenttime - _timer ) >= 1 then
\r
830 for i = 1, _timerlistlen do
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831 _timerlist[ i ]( _currenttime ) -- fire timers
\r
833 _timer = _currenttime
\r
835 socket_sleep( _sleeptime ) -- wait some time
\r
836 --collectgarbage( )
\r
841 --// EXPERIMENTAL //--
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843 local wrapclient = function( socket, ip, serverport, listeners, pattern, sslctx, startssl )
\r
844 local handler = wrapconnection( nil, listeners, socket, ip, serverport, "clientport", pattern, sslctx, startssl )
\r
845 _socketlist[ socket ] = handler
\r
846 _sendlistlen = addsocket(_sendlist, socket, _sendlistlen)
\r
847 return handler, socket
\r
850 local addclient = function( address, port, listeners, pattern, sslctx, startssl )
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851 local client, err = luasocket.tcp( )
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855 client:settimeout( 0 )
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856 _, err = client:connect( address, port )
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857 if err then -- try again
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858 local handler = wrapclient( client, address, port, listeners )
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860 wrapconnection( nil, listeners, client, address, port, "clientport", pattern, sslctx, startssl )
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864 --// EXPERIMENTAL //--
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866 ----------------------------------// BEGIN //--
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868 use "setmetatable" ( _socketlist, { __mode = "k" } )
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869 use "setmetatable" ( _readtimes, { __mode = "k" } )
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870 use "setmetatable" ( _writetimes, { __mode = "k" } )
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872 _timer = os_time( )
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873 _starttime = os_time( )
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875 addtimer( function( )
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876 local difftime = os_difftime( _currenttime - _starttime )
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877 if difftime > _checkinterval then
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878 _starttime = _currenttime
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879 for handler, timestamp in pairs( _writetimes ) do
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880 if os_difftime( _currenttime - timestamp ) > _sendtimeout then
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881 --_writetimes[ handler ] = nil
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882 handler.disconnect( )( handler, "send timeout" )
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883 handler.close( true ) -- forced disconnect
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886 for handler, timestamp in pairs( _readtimes ) do
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887 if os_difftime( _currenttime - timestamp ) > _readtimeout then
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888 --_readtimes[ handler ] = nil
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889 handler.disconnect( )( handler, "read timeout" )
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890 handler.close( ) -- forced disconnect?
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897 ----------------------------------// PUBLIC INTERFACE //--
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901 addclient = addclient,
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902 wrapclient = wrapclient,
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906 closeall = closeall,
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907 addtimer = addtimer,
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908 addserver = addserver,
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909 getserver = getserver,
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910 getsettings = getsettings,
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911 setquitting = setquitting,
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912 removeserver = removeserver,
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913 changesettings = changesettings,
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