3 server.lua by blastbeat of the luadch project
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5 re-used here under the MIT/X Consortium License
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7 - this script contains the server loop of the program
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8 - other scripts can reg a server here
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12 ----------------------------------// DECLARATION //--
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16 local STAT_UNIT = 1 / ( 1024 * 1024 ) -- mb
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18 --// lua functions //--
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20 local function use( what ) return _G[ what ] end
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22 local type = use "type"
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23 local pairs = use "pairs"
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24 local ipairs = use "ipairs"
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25 local tostring = use "tostring"
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26 local collectgarbage = use "collectgarbage"
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30 local table = use "table"
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31 local coroutine = use "coroutine"
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33 --// lua lib methods //--
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35 local table_concat = table.concat
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36 local table_remove = table.remove
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37 local string_sub = use'string'.sub
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38 local coroutine_wrap = coroutine.wrap
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39 local coroutine_yield = coroutine.yield
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40 local print = print;
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41 local out_put = function () end --print;
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42 local out_error = print;
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44 --// extern libs //--
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46 local luasec = select(2, pcall(require, "ssl"))
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47 local luasocket = require "socket"
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49 --// extern lib methods //--
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51 local ssl_wrap = ( luasec and luasec.wrap )
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52 local socket_bind = luasocket.bind
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53 local socket_select = luasocket.select
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54 local ssl_newcontext = ( luasec and luasec.newcontext )
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78 --// simple data types //--
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81 local readlen = 0 -- length of readlist
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82 local writelen = 0 -- lenght of writelist
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85 local receivestat = 0
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87 ----------------------------------// DEFINITION //--
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89 listener = { } -- key = port, value = table
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90 readlist = { } -- array with sockets to read from
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91 writelist = { } -- arrary with sockets to write to
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92 socketlist = { } -- key = socket, value = wrapped socket
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96 return receivestat, sendstat
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99 wrapserver = function( listener, socket, ip, serverport, mode, sslctx ) -- this function wraps a server
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101 local dispatch, disconnect = listener.listener, listener.disconnect -- dangerous
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103 local wrapclient, err
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106 if not ssl_newcontext then
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107 return nil, "luasec not found"
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109 if type( sslctx ) ~= "table" then
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110 out_error "server.lua: wrong server sslctx"
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111 return nil, "wrong server sslctx"
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113 sslctx, err = ssl_newcontext( sslctx )
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115 err = err or "wrong sslctx parameters"
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116 out_error( "server.lua: ", err )
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119 wrapclient = wrapsslclient
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120 wrapclient = wraptlsclient
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122 wrapclient = wraptcpclient
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125 local accept = socket.accept
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126 local close = socket.close
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128 --// public methods of the object //--
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130 local handler = { }
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132 handler.shutdown = function( ) end
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134 --[[handler.listener = function( data, err )
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135 return ondata( handler, data, err )
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137 handler.ssl = function( )
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138 return sslctx and true or false
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140 handler.close = function( closed )
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141 _ = not closed and close( socket )
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142 writelen = removesocket( writelist, socket, writelen )
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143 readlen = removesocket( readlist, socket, readlen )
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144 socketlist[ socket ] = nil
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147 handler.ip = function( )
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150 handler.serverport = function( )
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153 handler.socket = function( )
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156 handler.receivedata = function( )
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157 local client, err = accept( socket ) -- try to accept
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159 local ip, clientport = client:getpeername( )
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160 client:settimeout( 0 )
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161 local handler, client, err = wrapclient( listener, client, ip, serverport, clientport, mode, sslctx ) -- wrap new client socket
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162 if err then -- error while wrapping ssl socket
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165 out_put( "server.lua: accepted new client connection from ", ip, ":", clientport )
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166 return dispatch( handler )
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167 elseif err then -- maybe timeout or something else
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168 out_put( "server.lua: error with new client connection: ", err )
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175 wrapsslclient = function( listener, socket, ip, serverport, clientport, mode, sslctx ) -- this function wraps a ssl cleint
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177 local dispatch, disconnect = listener.listener, listener.disconnect
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179 --// transform socket to ssl object //--
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182 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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184 out_put( "server.lua: ssl error: ", err )
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185 return nil, nil, err -- fatal error
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187 socket:settimeout( 0 )
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189 --// private closures of the object //--
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191 local writequeue = { } -- buffer for messages to send
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193 local eol, fatal_send_error -- end of buffer
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195 local sstat, rstat = 0, 0
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197 --// local import of socket methods //--
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199 local send = socket.send
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200 local receive = socket.receive
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201 local close = socket.close
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202 --local shutdown = socket.shutdown
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204 --// public methods of the object //--
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206 local handler = { }
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208 handler.getstats = function( )
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209 return rstat, sstat
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212 handler.listener = function( data, err )
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213 return listener( handler, data, err )
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215 handler.ssl = function( )
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218 handler.send = function( _, data, i, j )
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219 return send( socket, data, i, j )
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221 handler.receive = function( pattern, prefix )
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222 return receive( socket, pattern, prefix )
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224 handler.shutdown = function( pattern )
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225 --return shutdown( socket, pattern )
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227 handler.close = function( closed )
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228 if eol and not fatal_send_error then handler._dispatchdata(); end
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230 writelen = ( eol and removesocket( writelist, socket, writelen ) ) or writelen
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231 readlen = removesocket( readlist, socket, readlen )
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232 socketlist[ socket ] = nil
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233 out_put "server.lua: closed handler and removed socket from list"
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235 handler.ip = function( )
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238 handler.serverport = function( )
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241 handler.clientport = function( )
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245 handler.write = function( data )
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247 writelen = writelen + 1
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248 writelist[ writelen ] = socket
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252 writequeue[ eol ] = data
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254 handler.writequeue = function( )
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257 handler.socket = function( )
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260 handler.mode = function( )
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263 handler._receivedata = function( )
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264 local data, err, part = receive( socket, mode ) -- receive data in "mode"
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265 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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266 local data = data or part or ""
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267 local count = #data * STAT_UNIT
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268 rstat = rstat + count
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269 receivestat = receivestat + count
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270 out_put( "server.lua: read data '", data, "', error: ", err )
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271 return dispatch( handler, data, err )
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272 else -- connections was closed or fatal error
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273 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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275 disconnect( handler, err )
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281 handler._dispatchdata = function( ) -- this function writes data to handlers
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282 local buffer = table_concat( writequeue, "", 1, eol )
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283 local succ, err, byte = send( socket, buffer )
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284 local count = ( succ or 0 ) * STAT_UNIT
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285 sstat = sstat + count
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286 sendstat = sendstat + count
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287 out_put( "server.lua: sended '", buffer, "', bytes: ", succ, ", error: ", err, ", part: ", byte, ", to: ", ip, ":", clientport )
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288 if succ then -- sending succesful
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291 writelen = removesocket( writelist, socket, writelen ) -- delete socket from writelist
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293 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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294 buffer = string_sub( buffer, byte + 1, -1 ) -- new buffer
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295 writequeue[ 1 ] = buffer -- insert new buffer in queue
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298 else -- connection was closed during sending or fatal error
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299 fatal_send_error = true;
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300 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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302 disconnect( handler, err )
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311 handler.getIp = handler.ip
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312 handler.getPort = handler.clientport
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314 --// handshake //--
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318 handler.handshake = coroutine_wrap( function( client )
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320 for i = 1, 10 do -- 10 handshake attemps
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321 _, err = client:dohandshake( )
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323 out_put( "server.lua: ssl handshake done" )
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324 writelen = ( wrote and removesocket( writelist, socket, writelen ) ) or writelen
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325 handler.receivedata = handler._receivedata -- when handshake is done, replace the handshake function with regular functions
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326 handler.dispatchdata = handler._dispatchdata
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327 return dispatch( handler )
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329 out_put( "server.lua: error during ssl handshake: ", err )
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330 if err == "wantwrite" then
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331 if wrote == nil then
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332 writelen = writelen + 1
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333 writelist[ writelen ] = client
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337 coroutine_yield( handler, nil, err ) -- handshake not finished
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340 _ = err ~= "closed" and close( socket )
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342 disconnect( handler, err )
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345 return false -- handshake failed
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348 handler.receivedata = handler.handshake
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349 handler.dispatchdata = handler.handshake
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351 handler.handshake( socket ) -- do handshake
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353 socketlist[ socket ] = handler
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354 readlen = readlen + 1
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355 readlist[ readlen ] = socket
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357 return handler, socket
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360 wraptlsclient = function( listener, socket, ip, serverport, clientport, mode, sslctx ) -- this function wraps a tls cleint
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362 local dispatch, disconnect = listener.listener, listener.disconnect
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364 --// transform socket to ssl object //--
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368 socket:settimeout( 0 )
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369 out_put("setting linger on "..tostring(socket))
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370 socket:setoption("linger", { on = true, timeout = 10 });
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371 --// private closures of the object //--
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373 local writequeue = { } -- buffer for messages to send
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375 local eol, fatal_send_error -- end of buffer
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377 local sstat, rstat = 0, 0
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379 --// local import of socket methods //--
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381 local send = socket.send
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382 local receive = socket.receive
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383 local close = socket.close
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384 --local shutdown = socket.shutdown
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386 --// public methods of the object //--
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388 local handler = { }
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390 handler.getstats = function( )
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391 return rstat, sstat
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394 handler.listener = function( data, err )
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395 return listener( handler, data, err )
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397 handler.ssl = function( )
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400 handler.send = function( _, data, i, j )
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401 return send( socket, data, i, j )
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403 handler.receive = function( pattern, prefix )
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404 return receive( socket, pattern, prefix )
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406 handler.shutdown = function( pattern )
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407 --return shutdown( socket, pattern )
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409 handler.close = function( closed )
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410 if eol and not fatal_send_error then handler._dispatchdata(); end
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412 writelen = ( eol and removesocket( writelist, socket, writelen ) ) or writelen
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413 readlen = removesocket( readlist, socket, readlen )
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414 socketlist[ socket ] = nil
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415 out_put "server.lua: closed handler and removed socket from list"
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417 handler.ip = function( )
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420 handler.serverport = function( )
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423 handler.clientport = function( )
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427 handler.write = function( data )
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429 writelen = writelen + 1
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430 writelist[ writelen ] = socket
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434 writequeue[ eol ] = data
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436 handler.writequeue = function( )
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439 handler.socket = function( )
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442 handler.mode = function( )
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445 handler._receivedata = function( )
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446 local data, err, part = receive( socket, mode ) -- receive data in "mode"
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447 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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448 local data = data or part or ""
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449 local count = #data * STAT_UNIT
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450 rstat = rstat + count
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451 receivestat = receivestat + count
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452 --out_put( "server.lua: read data '", data, "', error: ", err )
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453 return dispatch( handler, data, err )
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454 else -- connections was closed or fatal error
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455 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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457 disconnect( handler, err )
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463 handler._dispatchdata = function( ) -- this function writes data to handlers
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464 local buffer = table_concat( writequeue, "", 1, eol )
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465 local succ, err, byte = send( socket, buffer )
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466 local count = ( succ or 0 ) * STAT_UNIT
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467 sstat = sstat + count
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468 sendstat = sendstat + count
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469 out_put( "server.lua: sended '", buffer, "', bytes: ", succ, ", error: ", err, ", part: ", byte, ", to: ", ip, ":", clientport )
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470 if succ then -- sending succesful
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473 writelen = removesocket( writelist, socket, writelen ) -- delete socket from writelist
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474 if handler.need_tls then
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475 out_put("server.lua: connection is ready for tls handshake");
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476 handler.starttls(true);
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477 if handler.need_tls then
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478 out_put("server.lua: uh-oh... we still want tls, something must be wrong");
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482 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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483 buffer = string_sub( buffer, byte + 1, -1 ) -- new buffer
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484 writequeue[ 1 ] = buffer -- insert new buffer in queue
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487 else -- connection was closed during sending or fatal error
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488 fatal_send_error = true; -- :(
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489 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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491 disconnect( handler, err )
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498 handler.receivedata, handler.dispatchdata = handler._receivedata, handler._dispatchdata;
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501 handler.getIp = handler.ip
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502 handler.getPort = handler.clientport
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504 --// handshake //--
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508 handler.starttls = function (now)
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509 if not now then out_put("server.lua: we need to do tls, but delaying until later"); handler.need_tls = true; return; end
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510 out_put( "server.lua: attempting to start tls on "..tostring(socket) )
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511 socket, err = ssl_wrap( socket, sslctx ) -- wrap socket
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512 out_put("sslwrapped socket is "..tostring(socket));
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514 out_put( "server.lua: ssl error: ", err )
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515 return nil, nil, err -- fatal error
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517 socket:settimeout( 1 )
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519 receive = socket.receive
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520 close = socket.close
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521 handler.ssl = function( )
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524 handler.send = function( _, data, i, j )
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525 return send( socket, data, i, j )
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527 handler.receive = function( pattern, prefix )
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528 return receive( socket, pattern, prefix )
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531 handler.starttls = nil;
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533 handler.handshake = coroutine_wrap( function( client )
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535 for i = 1, 10 do -- 10 handshake attemps
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536 _, err = client:dohandshake( )
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538 out_put( "server.lua: ssl handshake done" )
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539 writelen = ( wrote and removesocket( writelist, socket, writelen ) ) or writelen
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540 handler.receivedata = handler._receivedata -- when handshake is done, replace the handshake function with regular functions
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541 handler.dispatchdata = handler._dispatchdata
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542 handler.need_tls = nil
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543 socketlist[ client ] = handler
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544 readlen = readlen + 1
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545 readlist[ readlen ] = client
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548 out_put( "server.lua: error during ssl handshake: ", err )
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549 if err == "wantwrite" then
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550 if wrote == nil then
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551 writelen = writelen + 1
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552 writelist[ writelen ] = client
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556 coroutine_yield( handler, nil, err ) -- handshake not finished
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559 _ = err ~= "closed" and close( socket )
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561 disconnect( handler, err )
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564 return false -- handshake failed
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567 handler.receivedata = handler.handshake
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568 handler.dispatchdata = handler.handshake
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570 handler.handshake( socket ) -- do handshake
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572 socketlist[ socket ] = handler
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573 readlen = readlen + 1
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574 readlist[ readlen ] = socket
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576 return handler, socket
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579 wraptcpclient = function( listener, socket, ip, serverport, clientport, mode ) -- this function wraps a socket
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581 local dispatch, disconnect = listener.listener, listener.disconnect
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583 --// private closures of the object //--
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585 local writequeue = { } -- list for messages to send
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587 local eol, fatal_send_error
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589 local rstat, sstat = 0, 0
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591 --// local import of socket methods //--
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593 local send = socket.send
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594 local receive = socket.receive
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595 local close = socket.close
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596 local shutdown = socket.shutdown
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598 --// public methods of the object //--
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600 local handler = { }
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602 handler.getstats = function( )
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603 return rstat, sstat
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606 handler.listener = function( data, err )
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607 return listener( handler, data, err )
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609 handler.ssl = function( )
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612 handler.send = function( _, data, i, j )
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613 return send( socket, data, i, j )
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615 handler.receive = function( pattern, prefix )
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616 return receive( socket, pattern, prefix )
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618 handler.shutdown = function( pattern )
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619 return shutdown( socket, pattern )
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621 handler.close = function( closed )
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622 if eol and not fatal_send_error then handler.dispatchdata(); end
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623 _ = not closed and shutdown( socket )
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624 _ = not closed and close( socket )
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625 writelen = ( eol and removesocket( writelist, socket, writelen ) ) or writelen
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626 readlen = removesocket( readlist, socket, readlen )
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627 socketlist[ socket ] = nil
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628 out_put "server.lua: closed handler and removed socket from list"
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630 handler.ip = function( )
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633 handler.serverport = function( )
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636 handler.clientport = function( )
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639 handler.write = function( data )
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641 writelen = writelen + 1
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642 writelist[ writelen ] = socket
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646 writequeue[ eol ] = data
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648 handler.writequeue = function( )
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651 handler.socket = function( )
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654 handler.mode = function( )
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658 handler.receivedata = function( )
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659 local data, err, part = receive( socket, mode ) -- receive data in "mode"
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660 if not err or ( err == "timeout" or err == "wantread" ) then -- received something
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661 local data = data or part or ""
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662 local count = #data * STAT_UNIT
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663 rstat = rstat + count
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664 receivestat = receivestat + count
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665 out_put( "server.lua: read data '", data, "', error: ", err )
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666 return dispatch( handler, data, err )
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667 else -- connections was closed or fatal error
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668 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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670 disconnect( handler, err )
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677 handler.dispatchdata = function( ) -- this function writes data to handlers
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678 local buffer = table_concat( writequeue, "", 1, eol )
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679 local succ, err, byte = send( socket, buffer )
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680 local count = ( succ or 0 ) * STAT_UNIT
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681 sstat = sstat + count
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682 sendstat = sendstat + count
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683 out_put( "server.lua: sended '", buffer, "', bytes: ", succ, ", error: ", err, ", part: ", byte, ", to: ", ip, ":", clientport )
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684 if succ then -- sending succesful
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687 writelen = removesocket( writelist, socket, writelen ) -- delete socket from writelist
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689 elseif byte and ( err == "timeout" or err == "wantwrite" ) then -- want write
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690 buffer = string_sub( buffer, byte + 1, -1 ) -- new buffer
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691 writequeue[ 1 ] = buffer -- insert new buffer in queue
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694 else -- connection was closed during sending or fatal error
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695 fatal_send_error = true; -- :'-(
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696 out_put( "server.lua: client ", ip, ":", clientport, " error: ", err )
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698 disconnect( handler, err )
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707 handler.getIp = handler.ip
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708 handler.getPort = handler.clientport
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710 socketlist[ socket ] = handler
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711 readlen = readlen + 1
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712 readlist[ readlen ] = socket
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714 return handler, socket
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717 addtimer = function( listener )
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718 timelistener[ #timelistener + 1 ] = listener
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721 firetimer = function( listener )
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722 for i, listener in ipairs( timelistener ) do
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727 addserver = function( listeners, port, addr, mode, sslctx ) -- this function provides a way for other scripts to reg a server
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729 if type( listeners ) ~= "table" then
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730 err = "invalid listener table"
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732 for name, func in pairs( listeners ) do
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733 if type( func ) ~= "function" then
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734 --err = "invalid listener function"
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739 if not type( port ) == "number" or not ( port >= 0 and port <= 65535 ) then
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740 err = "invalid port"
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741 elseif listener[ port ] then
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742 err= "listeners on port '" .. port .. "' already exist"
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743 elseif sslctx and not luasec then
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744 err = "luasec not found"
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747 out_error( "server.lua: ", err )
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751 local server, err = socket_bind( addr, port )
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753 out_error( "server.lua: ", err )
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756 local handler, err = wrapserver( listeners, server, addr, port, mode, sslctx ) -- wrap new server socket
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757 if not handler then
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761 server:settimeout( 0 )
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762 readlen = readlen + 1
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763 readlist[ readlen ] = server
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764 listener[ port ] = listeners
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765 socketlist[ server ] = handler
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766 out_put( "server.lua: new server listener on ", addr, ":", port )
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770 removesocket = function( tbl, socket, len ) -- this function removes sockets from a list
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771 for i, target in ipairs( tbl ) do
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772 if target == socket then
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774 table_remove( tbl, i )
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781 closeall = function( )
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782 for sock, handler in pairs( socketlist ) do
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783 handler.shutdown( )
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785 socketlist[ sock ] = nil
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787 writelist, readlist, socketlist = { }, { }, { }
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790 closesocket = function( socket )
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791 writelen = removesocket( writelist, socket, writelen )
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792 readlen = removesocket( readlist, socket, readlen )
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793 socketlist[ socket ] = nil
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797 loop = function( ) -- this is the main loop of the program
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798 --signal_set( "hub", "run" )
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800 --[[print(readlen, writelen)
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801 for _, s in ipairs(readlist) do print("R:", tostring(s)) end
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802 for _, s in ipairs(writelist) do print("W:", tostring(s)) end
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803 out_put("select()"..os.time())]]
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804 local read, write, err = socket_select( readlist, writelist, 1 ) -- 1 sec timeout, nice for timers
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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.dispatchdata( )
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810 closesocket( socket )
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811 out_put "server.lua: found no handler and closed socket (writelist)" -- this should not happen
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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.receivedata( )
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819 closesocket( socket )
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820 out_put "server.lua: found no handler and closed socket (readlist)" -- this can happen
\r
828 ----------------------------------// BEGIN //--
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830 ----------------------------------// PUBLIC INTERFACE //--
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837 closeall = closeall,
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838 addtimer = addtimer,
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839 wraptlsclient = wraptlsclient,
\r