| 1 | --[[ |
| 2 | |
| 3 | |
| 4 | server.lua based on lua/libevent by blastbeat |
| 5 | |
| 6 | notes: |
| 7 | -- when using luaevent, never register 2 or more EV_READ at one socket, same for EV_WRITE |
| 8 | -- you cant even register a new EV_READ/EV_WRITE callback inside another one |
| 9 | -- never call eventcallback:close( ) from inside eventcallback |
| 10 | -- to do some of the above, use timeout events or something what will called from outside |
| 11 | -- dont let garbagecollect eventcallbacks, as long they are running |
| 12 | -- when using luasec, there are 4 cases of timeout errors: wantread or wantwrite during reading or writing |
| 13 | |
| 14 | --]] |
| 15 | |
| 16 | local SCRIPT_NAME = "server_event.lua" |
| 17 | local SCRIPT_VERSION = "0.05" |
| 18 | local SCRIPT_AUTHOR = "blastbeat" |
| 19 | local LAST_MODIFIED = "2009/11/20" |
| 20 | |
| 21 | local cfg = { |
| 22 | MAX_CONNECTIONS = 100000, -- max per server connections (use "ulimit -n" on *nix) |
| 23 | MAX_HANDSHAKE_ATTEMPTS= 1000, -- attempts to finish ssl handshake |
| 24 | HANDSHAKE_TIMEOUT = 60, -- timeout in seconds per handshake attempt |
| 25 | MAX_READ_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes allowed to read from sockets |
| 26 | MAX_SEND_LENGTH = 1024 * 1024 * 1024 * 1024, -- max bytes size of write buffer (for writing on sockets) |
| 27 | ACCEPT_DELAY = 10, -- seconds to wait until the next attempt of a full server to accept |
| 28 | READ_TIMEOUT = 60 * 60 * 6, -- timeout in seconds for read data from socket |
| 29 | WRITE_TIMEOUT = 180, -- timeout in seconds for write data on socket |
| 30 | CONNECT_TIMEOUT = 20, -- timeout in seconds for connection attempts |
| 31 | CLEAR_DELAY = 5, -- seconds to wait for clearing interface list (and calling ondisconnect listeners) |
| 32 | DEBUG = true, -- show debug messages |
| 33 | } |
| 34 | |
| 35 | local function use(x) return rawget(_G, x); end |
| 36 | local print = use "print" |
| 37 | local pcall = use "pcall" |
| 38 | local ipairs = use "ipairs" |
| 39 | local string = use "string" |
| 40 | local select = use "select" |
| 41 | local require = use "require" |
| 42 | local tostring = use "tostring" |
| 43 | local coroutine = use "coroutine" |
| 44 | local setmetatable = use "setmetatable" |
| 45 | |
| 46 | local ssl = use "ssl" |
| 47 | local socket = use "socket" or require "socket" |
| 48 | |
| 49 | local log = require ("util.logger").init("socket") |
| 50 | |
| 51 | local function debug(...) |
| 52 | return log("debug", ("%s "):rep(select('#', ...)), ...) |
| 53 | end |
| 54 | local vdebug = debug; |
| 55 | |
| 56 | local bitor = ( function( ) -- thx Rici Lake |
| 57 | local hasbit = function( x, p ) |
| 58 | return x % ( p + p ) >= p |
| 59 | end |
| 60 | return function( x, y ) |
| 61 | local p = 1 |
| 62 | local z = 0 |
| 63 | local limit = x > y and x or y |
| 64 | while p <= limit do |
| 65 | if hasbit( x, p ) or hasbit( y, p ) then |
| 66 | z = z + p |
| 67 | end |
| 68 | p = p + p |
| 69 | end |
| 70 | return z |
| 71 | end |
| 72 | end )( ) |
| 73 | |
| 74 | local event = require "luaevent.core" |
| 75 | local base = event.new( ) |
| 76 | local EV_READ = event.EV_READ |
| 77 | local EV_WRITE = event.EV_WRITE |
| 78 | local EV_TIMEOUT = event.EV_TIMEOUT |
| 79 | local EV_SIGNAL = event.EV_SIGNAL |
| 80 | |
| 81 | local EV_READWRITE = bitor( EV_READ, EV_WRITE ) |
| 82 | |
| 83 | local interfacelist = ( function( ) -- holds the interfaces for sockets |
| 84 | local array = { } |
| 85 | local len = 0 |
| 86 | return function( method, arg ) |
| 87 | if "add" == method then |
| 88 | len = len + 1 |
| 89 | array[ len ] = arg |
| 90 | arg:_position( len ) |
| 91 | return len |
| 92 | elseif "delete" == method then |
| 93 | if len <= 0 then |
| 94 | return nil, "array is already empty" |
| 95 | end |
| 96 | local position = arg:_position() -- get position in array |
| 97 | if position ~= len then |
| 98 | local interface = array[ len ] -- get last interface |
| 99 | array[ position ] = interface -- copy it into free position |
| 100 | array[ len ] = nil -- free last position |
| 101 | interface:_position( position ) -- set new position in array |
| 102 | else -- free last position |
| 103 | array[ len ] = nil |
| 104 | end |
| 105 | len = len - 1 |
| 106 | return len |
| 107 | else |
| 108 | return array |
| 109 | end |
| 110 | end |
| 111 | end )( ) |
| 112 | |
| 113 | -- Client interface methods |
| 114 | local interface_mt |
| 115 | do |
| 116 | interface_mt = {}; interface_mt.__index = interface_mt; |
| 117 | |
| 118 | local addevent = base.addevent |
| 119 | local coroutine_wrap, coroutine_yield = coroutine.wrap,coroutine.yield |
| 120 | local string_len = string.len |
| 121 | |
| 122 | -- Private methods |
| 123 | function interface_mt:_position(new_position) |
| 124 | self.position = new_position or self.position |
| 125 | return self.position; |
| 126 | end |
| 127 | function interface_mt:_close() -- regs event to start self:_destroy() |
| 128 | local callback = function( ) |
| 129 | self:_destroy(); |
| 130 | self.eventclose = nil |
| 131 | return -1 |
| 132 | end |
| 133 | self.eventclose = addevent( base, nil, EV_TIMEOUT, callback, 0 ) |
| 134 | return true |
| 135 | end |
| 136 | |
| 137 | function interface_mt:_start_connection(plainssl) -- should be called from addclient |
| 138 | local callback = function( event ) |
| 139 | if EV_TIMEOUT == event then -- timeout during connection |
| 140 | self.fatalerror = "connection timeout" |
| 141 | self:ontimeout() -- call timeout listener |
| 142 | self:_close() |
| 143 | debug( "new connection failed. id:", self.id, "error:", self.fatalerror ) |
| 144 | else |
| 145 | if plainssl and ssl then -- start ssl session |
| 146 | self:starttls(nil, true) |
| 147 | else -- normal connection |
| 148 | self:_start_session(true) |
| 149 | end |
| 150 | debug( "new connection established. id:", self.id ) |
| 151 | end |
| 152 | self.eventconnect = nil |
| 153 | return -1 |
| 154 | end |
| 155 | self.eventconnect = addevent( base, self.conn, EV_WRITE, callback, cfg.CONNECT_TIMEOUT ) |
| 156 | return true |
| 157 | end |
| 158 | function interface_mt:_start_session(call_onconnect) -- new session, for example after startssl |
| 159 | if self.type == "client" then |
| 160 | local callback = function( ) |
| 161 | self:_lock( false, false, false ) |
| 162 | --vdebug( "start listening on client socket with id:", self.id ) |
| 163 | self.eventread = addevent( base, self.conn, EV_READ, self.readcallback, cfg.READ_TIMEOUT ); -- register callback |
| 164 | if call_onconnect then |
| 165 | self:onconnect() |
| 166 | end |
| 167 | self.eventsession = nil |
| 168 | return -1 |
| 169 | end |
| 170 | self.eventsession = addevent( base, nil, EV_TIMEOUT, callback, 0 ) |
| 171 | else |
| 172 | self:_lock( false ) |
| 173 | --vdebug( "start listening on server socket with id:", self.id ) |
| 174 | self.eventread = addevent( base, self.conn, EV_READ, self.readcallback ) -- register callback |
| 175 | end |
| 176 | return true |
| 177 | end |
| 178 | function interface_mt:_start_ssl(call_onconnect) -- old socket will be destroyed, therefore we have to close read/write events first |
| 179 | --vdebug( "starting ssl session with client id:", self.id ) |
| 180 | local _ |
| 181 | _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks! |
| 182 | _ = self.eventwrite and self.eventwrite:close( ) |
| 183 | self.eventread, self.eventwrite = nil, nil |
| 184 | local err |
| 185 | self.conn, err = ssl.wrap( self.conn, self._sslctx ) |
| 186 | if err then |
| 187 | self.fatalerror = err |
| 188 | self.conn = nil -- cannot be used anymore |
| 189 | if call_onconnect then |
| 190 | self.ondisconnect = nil -- dont call this when client isnt really connected |
| 191 | end |
| 192 | self:_close() |
| 193 | debug( "fatal error while ssl wrapping:", err ) |
| 194 | return false |
| 195 | end |
| 196 | self.conn:settimeout( 0 ) -- set non blocking |
| 197 | local handshakecallback = coroutine_wrap( |
| 198 | function( event ) |
| 199 | local _, err |
| 200 | local attempt = 0 |
| 201 | local maxattempt = cfg.MAX_HANDSHAKE_ATTEMPTS |
| 202 | while attempt < maxattempt do -- no endless loop |
| 203 | attempt = attempt + 1 |
| 204 | debug( "ssl handshake of client with id:"..tostring(self)..", attempt:"..attempt ) |
| 205 | if attempt > maxattempt then |
| 206 | self.fatalerror = "max handshake attempts exceeded" |
| 207 | elseif EV_TIMEOUT == event then |
| 208 | self.fatalerror = "timeout during handshake" |
| 209 | else |
| 210 | _, err = self.conn:dohandshake( ) |
| 211 | if not err then |
| 212 | self:_lock( false, false, false ) -- unlock the interface; sending, closing etc allowed |
| 213 | self.send = self.conn.send -- caching table lookups with new client object |
| 214 | self.receive = self.conn.receive |
| 215 | local onsomething |
| 216 | if not call_onconnect then -- trigger listener |
| 217 | self:onstatus("ssl-handshake-complete"); |
| 218 | end |
| 219 | self:_start_session( call_onconnect ) |
| 220 | debug( "ssl handshake done" ) |
| 221 | self.eventhandshake = nil |
| 222 | return -1 |
| 223 | end |
| 224 | debug( "error during ssl handshake:", err ) |
| 225 | if err == "wantwrite" then |
| 226 | event = EV_WRITE |
| 227 | elseif err == "wantread" then |
| 228 | event = EV_READ |
| 229 | else |
| 230 | self.fatalerror = err |
| 231 | end |
| 232 | end |
| 233 | if self.fatalerror then |
| 234 | if call_onconnect then |
| 235 | self.ondisconnect = nil -- dont call this when client isnt really connected |
| 236 | end |
| 237 | self:_close() |
| 238 | debug( "handshake failed because:", self.fatalerror ) |
| 239 | self.eventhandshake = nil |
| 240 | return -1 |
| 241 | end |
| 242 | event = coroutine_yield( event, cfg.HANDSHAKE_TIMEOUT ) -- yield this monster... |
| 243 | end |
| 244 | end |
| 245 | ) |
| 246 | debug "starting handshake..." |
| 247 | self:_lock( false, true, true ) -- unlock read/write events, but keep interface locked |
| 248 | self.eventhandshake = addevent( base, self.conn, EV_READWRITE, handshakecallback, cfg.HANDSHAKE_TIMEOUT ) |
| 249 | return true |
| 250 | end |
| 251 | function interface_mt:_destroy() -- close this interface + events and call last listener |
| 252 | debug( "closing client with id:", self.id ) |
| 253 | self:_lock( true, true, true ) -- first of all, lock the interface to avoid further actions |
| 254 | local _ |
| 255 | _ = self.eventread and self.eventread:close( ) -- close events; this must be called outside of the event callbacks! |
| 256 | if self.type == "client" then |
| 257 | _ = self.eventwrite and self.eventwrite:close( ) |
| 258 | _ = self.eventhandshake and self.eventhandshake:close( ) |
| 259 | _ = self.eventstarthandshake and self.eventstarthandshake:close( ) |
| 260 | _ = self.eventconnect and self.eventconnect:close( ) |
| 261 | _ = self.eventsession and self.eventsession:close( ) |
| 262 | _ = self.eventwritetimeout and self.eventwritetimeout:close( ) |
| 263 | _ = self.eventreadtimeout and self.eventreadtimeout:close( ) |
| 264 | _ = self.ondisconnect and self:ondisconnect( self.fatalerror ~= "client to close" and self.fatalerror) -- call ondisconnect listener (wont be the case if handshake failed on connect) |
| 265 | _ = self.conn and self.conn:close( ) -- close connection, must also be called outside of any socket registered events! |
| 266 | _ = self._server and self._server:counter(-1); |
| 267 | self.eventread, self.eventwrite = nil, nil |
| 268 | self.eventstarthandshake, self.eventhandshake, self.eventclose = nil, nil, nil |
| 269 | self.readcallback, self.writecallback = nil, nil |
| 270 | else |
| 271 | self.conn:close( ) |
| 272 | self.eventread, self.eventclose = nil, nil |
| 273 | self.interface, self.readcallback = nil, nil |
| 274 | end |
| 275 | interfacelist( "delete", self ) |
| 276 | return true |
| 277 | end |
| 278 | |
| 279 | function interface_mt:_lock(nointerface, noreading, nowriting) -- lock or unlock this interface or events |
| 280 | self.nointerface, self.noreading, self.nowriting = nointerface, noreading, nowriting |
| 281 | return nointerface, noreading, nowriting |
| 282 | end |
| 283 | |
| 284 | --TODO: Deprecate |
| 285 | function interface_mt:lock_read(switch) |
| 286 | if switch then |
| 287 | return self:pause(); |
| 288 | else |
| 289 | return self:resume(); |
| 290 | end |
| 291 | end |
| 292 | |
| 293 | function interface_mt:pause() |
| 294 | return self:_lock(self.nointerface, true, self.nowriting); |
| 295 | end |
| 296 | |
| 297 | function interface_mt:resume() |
| 298 | return self:_lock(self.nointerface, false, self.nowriting); |
| 299 | end |
| 300 | |
| 301 | function interface_mt:counter(c) |
| 302 | if c then |
| 303 | self._connections = self._connections + c |
| 304 | end |
| 305 | return self._connections |
| 306 | end |
| 307 | |
| 308 | -- Public methods |
| 309 | function interface_mt:write(data) |
| 310 | if self.nowriting then return nil, "locked" end |
| 311 | --vdebug( "try to send data to client, id/data:", self.id, data ) |
| 312 | data = tostring( data ) |
| 313 | local len = string_len( data ) |
| 314 | local total = len + self.writebufferlen |
| 315 | if total > cfg.MAX_SEND_LENGTH then -- check buffer length |
| 316 | local err = "send buffer exceeded" |
| 317 | debug( "error:", err ) -- to much, check your app |
| 318 | return nil, err |
| 319 | end |
| 320 | self.writebuffer = self.writebuffer .. data -- new buffer |
| 321 | self.writebufferlen = total |
| 322 | if not self.eventwrite then -- register new write event |
| 323 | --vdebug( "register new write event" ) |
| 324 | self.eventwrite = addevent( base, self.conn, EV_WRITE, self.writecallback, cfg.WRITE_TIMEOUT ) |
| 325 | end |
| 326 | return true |
| 327 | end |
| 328 | function interface_mt:close(now) |
| 329 | if self.nointerface then return nil, "locked"; end |
| 330 | debug( "try to close client connection with id:", self.id ) |
| 331 | if self.type == "client" then |
| 332 | self.fatalerror = "client to close" |
| 333 | if ( not self.eventwrite ) or now then -- try to close immediately |
| 334 | self:_lock( true, true, true ) |
| 335 | self:_close() |
| 336 | return true |
| 337 | else -- wait for incomplete write request |
| 338 | self:_lock( true, true, false ) |
| 339 | debug "closing delayed until writebuffer is empty" |
| 340 | return nil, "writebuffer not empty, waiting" |
| 341 | end |
| 342 | else |
| 343 | debug( "try to close server with id:", self.id, "args:", now ) |
| 344 | self.fatalerror = "server to close" |
| 345 | self:_lock( true ) |
| 346 | local count = 0 |
| 347 | for _, item in ipairs( interfacelist( ) ) do |
| 348 | if ( item.type ~= "server" ) and ( item._server == self ) then -- client/server match |
| 349 | if item:close( now ) then -- writebuffer was empty |
| 350 | count = count + 1 |
| 351 | end |
| 352 | end |
| 353 | end |
| 354 | local timeout = 0 -- dont wait for unfinished writebuffers of clients... |
| 355 | if not now then |
| 356 | timeout = cfg.WRITE_TIMEOUT -- ...or wait for it |
| 357 | end |
| 358 | self:_close( timeout ) -- add new event to remove the server interface |
| 359 | debug( "seconds remained until server is closed:", timeout ) |
| 360 | return count -- returns finished clients with empty writebuffer |
| 361 | end |
| 362 | end |
| 363 | |
| 364 | function interface_mt:socket() |
| 365 | return self.conn |
| 366 | end |
| 367 | |
| 368 | function interface_mt:server() |
| 369 | return self._server or self; |
| 370 | end |
| 371 | |
| 372 | function interface_mt:port() |
| 373 | return self._port |
| 374 | end |
| 375 | |
| 376 | function interface_mt:serverport() |
| 377 | return self._serverport |
| 378 | end |
| 379 | |
| 380 | function interface_mt:ip() |
| 381 | return self._ip |
| 382 | end |
| 383 | |
| 384 | function interface_mt:ssl() |
| 385 | return self._usingssl |
| 386 | end |
| 387 | |
| 388 | function interface_mt:type() |
| 389 | return self._type or "client" |
| 390 | end |
| 391 | |
| 392 | function interface_mt:connections() |
| 393 | return self._connections |
| 394 | end |
| 395 | |
| 396 | function interface_mt:address() |
| 397 | return self.addr |
| 398 | end |
| 399 | |
| 400 | function interface_mt:set_sslctx(sslctx) |
| 401 | self._sslctx = sslctx; |
| 402 | if sslctx then |
| 403 | self.starttls = nil; -- use starttls() of interface_mt |
| 404 | else |
| 405 | self.starttls = false; -- prevent starttls() |
| 406 | end |
| 407 | end |
| 408 | |
| 409 | function interface_mt:set_mode(pattern) |
| 410 | if pattern then |
| 411 | self._pattern = pattern; |
| 412 | end |
| 413 | return self._pattern; |
| 414 | end |
| 415 | |
| 416 | function interface_mt:set_send(new_send) |
| 417 | -- No-op, we always use the underlying connection's send |
| 418 | end |
| 419 | |
| 420 | function interface_mt:starttls(sslctx, call_onconnect) |
| 421 | debug( "try to start ssl at client id:", self.id ) |
| 422 | local err |
| 423 | self._sslctx = sslctx; |
| 424 | if self._usingssl then -- startssl was already called |
| 425 | err = "ssl already active" |
| 426 | end |
| 427 | if err then |
| 428 | debug( "error:", err ) |
| 429 | return nil, err |
| 430 | end |
| 431 | self._usingssl = true |
| 432 | self.startsslcallback = function( ) -- we have to start the handshake outside of a read/write event |
| 433 | self.startsslcallback = nil |
| 434 | self:_start_ssl(call_onconnect); |
| 435 | self.eventstarthandshake = nil |
| 436 | return -1 |
| 437 | end |
| 438 | if not self.eventwrite then |
| 439 | self:_lock( true, true, true ) -- lock the interface, to not disturb the handshake |
| 440 | self.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, self.startsslcallback, 0 ) -- add event to start handshake |
| 441 | else -- wait until writebuffer is empty |
| 442 | self:_lock( true, true, false ) |
| 443 | debug "ssl session delayed until writebuffer is empty..." |
| 444 | end |
| 445 | self.starttls = false; |
| 446 | return true |
| 447 | end |
| 448 | |
| 449 | function interface_mt:setoption(option, value) |
| 450 | if self.conn.setoption then |
| 451 | return self.conn:setoption(option, value); |
| 452 | end |
| 453 | return false, "setoption not implemented"; |
| 454 | end |
| 455 | |
| 456 | function interface_mt:setlistener(listener) |
| 457 | self.onconnect, self.ondisconnect, self.onincoming, self.ontimeout, self.onstatus |
| 458 | = listener.onconnect, listener.ondisconnect, listener.onincoming, listener.ontimeout, listener.onstatus; |
| 459 | end |
| 460 | |
| 461 | -- Stub handlers |
| 462 | function interface_mt:onconnect() |
| 463 | return self:onincoming(nil); |
| 464 | end |
| 465 | function interface_mt:onincoming() |
| 466 | end |
| 467 | function interface_mt:ondisconnect() |
| 468 | end |
| 469 | function interface_mt:ontimeout() |
| 470 | end |
| 471 | function interface_mt:ondrain() |
| 472 | end |
| 473 | function interface_mt:onstatus() |
| 474 | end |
| 475 | end |
| 476 | |
| 477 | -- End of client interface methods |
| 478 | |
| 479 | local handleclient; |
| 480 | do |
| 481 | local string_sub = string.sub -- caching table lookups |
| 482 | local string_len = string.len |
| 483 | local addevent = base.addevent |
| 484 | local coroutine_wrap = coroutine.wrap |
| 485 | local socket_gettime = socket.gettime |
| 486 | local coroutine_yield = coroutine.yield |
| 487 | function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface |
| 488 | --vdebug("creating client interfacce...") |
| 489 | local interface = { |
| 490 | type = "client"; |
| 491 | conn = client; |
| 492 | currenttime = socket_gettime( ); -- safe the origin |
| 493 | writebuffer = ""; -- writebuffer |
| 494 | writebufferlen = 0; -- length of writebuffer |
| 495 | send = client.send; -- caching table lookups |
| 496 | receive = client.receive; |
| 497 | onconnect = listener.onconnect; -- will be called when client disconnects |
| 498 | ondisconnect = listener.ondisconnect; -- will be called when client disconnects |
| 499 | onincoming = listener.onincoming; -- will be called when client sends data |
| 500 | ontimeout = listener.ontimeout; -- called when fatal socket timeout occurs |
| 501 | onstatus = listener.onstatus; -- called for status changes (e.g. of SSL/TLS) |
| 502 | eventread = false, eventwrite = false, eventclose = false, |
| 503 | eventhandshake = false, eventstarthandshake = false; -- event handler |
| 504 | eventconnect = false, eventsession = false; -- more event handler... |
| 505 | eventwritetimeout = false; -- even more event handler... |
| 506 | eventreadtimeout = false; |
| 507 | fatalerror = false; -- error message |
| 508 | writecallback = false; -- will be called on write events |
| 509 | readcallback = false; -- will be called on read events |
| 510 | nointerface = true; -- lock/unlock parameter of this interface |
| 511 | noreading = false, nowriting = false; -- locks of the read/writecallback |
| 512 | startsslcallback = false; -- starting handshake callback |
| 513 | position = false; -- position of client in interfacelist |
| 514 | |
| 515 | -- Properties |
| 516 | _ip = ip, _port = port, _server = server, _pattern = pattern, |
| 517 | _serverport = (server and server:port() or nil), |
| 518 | _sslctx = sslctx; -- parameters |
| 519 | _usingssl = false; -- client is using ssl; |
| 520 | } |
| 521 | if not ssl then interface.starttls = false; end |
| 522 | interface.id = tostring(interface):match("%x+$"); |
| 523 | interface.writecallback = function( event ) -- called on write events |
| 524 | --vdebug( "new client write event, id/ip/port:", interface, ip, port ) |
| 525 | if interface.nowriting or ( interface.fatalerror and ( "client to close" ~= interface.fatalerror ) ) then -- leave this event |
| 526 | --vdebug( "leaving this event because:", interface.nowriting or interface.fatalerror ) |
| 527 | interface.eventwrite = false |
| 528 | return -1 |
| 529 | end |
| 530 | if EV_TIMEOUT == event then -- took too long to write some data to socket -> disconnect |
| 531 | interface.fatalerror = "timeout during writing" |
| 532 | debug( "writing failed:", interface.fatalerror ) |
| 533 | interface:_close() |
| 534 | interface.eventwrite = false |
| 535 | return -1 |
| 536 | else -- can write :) |
| 537 | if interface._usingssl then -- handle luasec |
| 538 | if interface.eventreadtimeout then -- we have to read first |
| 539 | local ret = interface.readcallback( ) -- call readcallback |
| 540 | --vdebug( "tried to read in writecallback, result:", ret ) |
| 541 | end |
| 542 | if interface.eventwritetimeout then -- luasec only |
| 543 | interface.eventwritetimeout:close( ) -- first we have to close timeout event which where regged after a wantread error |
| 544 | interface.eventwritetimeout = false |
| 545 | end |
| 546 | end |
| 547 | local succ, err, byte = interface.conn:send( interface.writebuffer, 1, interface.writebufferlen ) |
| 548 | --vdebug( "write data:", interface.writebuffer, "error:", err, "part:", byte ) |
| 549 | if succ then -- writing succesful |
| 550 | interface.writebuffer = "" |
| 551 | interface.writebufferlen = 0 |
| 552 | interface:ondrain(); |
| 553 | if interface.fatalerror then |
| 554 | debug "closing client after writing" |
| 555 | interface:_close() -- close interface if needed |
| 556 | elseif interface.startsslcallback then -- start ssl connection if needed |
| 557 | debug "starting ssl handshake after writing" |
| 558 | interface.eventstarthandshake = addevent( base, nil, EV_TIMEOUT, interface.startsslcallback, 0 ) |
| 559 | elseif interface.eventreadtimeout then |
| 560 | return EV_WRITE, EV_TIMEOUT |
| 561 | end |
| 562 | interface.eventwrite = nil |
| 563 | return -1 |
| 564 | elseif byte and (err == "timeout" or err == "wantwrite") then -- want write again |
| 565 | --vdebug( "writebuffer is not empty:", err ) |
| 566 | interface.writebuffer = string_sub( interface.writebuffer, byte + 1, interface.writebufferlen ) -- new buffer |
| 567 | interface.writebufferlen = interface.writebufferlen - byte |
| 568 | if "wantread" == err then -- happens only with luasec |
| 569 | local callback = function( ) |
| 570 | interface:_close() |
| 571 | interface.eventwritetimeout = nil |
| 572 | return -1; |
| 573 | end |
| 574 | interface.eventwritetimeout = addevent( base, nil, EV_TIMEOUT, callback, cfg.WRITE_TIMEOUT ) -- reg a new timeout event |
| 575 | debug( "wantread during write attempt, reg it in readcallback but dont know what really happens next..." ) |
| 576 | -- hopefully this works with luasec; its simply not possible to use 2 different write events on a socket in luaevent |
| 577 | return -1 |
| 578 | end |
| 579 | return EV_WRITE, cfg.WRITE_TIMEOUT |
| 580 | else -- connection was closed during writing or fatal error |
| 581 | interface.fatalerror = err or "fatal error" |
| 582 | debug( "connection failed in write event:", interface.fatalerror ) |
| 583 | interface:_close() |
| 584 | interface.eventwrite = nil |
| 585 | return -1 |
| 586 | end |
| 587 | end |
| 588 | end |
| 589 | |
| 590 | interface.readcallback = function( event ) -- called on read events |
| 591 | --vdebug( "new client read event, id/ip/port:", tostring(interface.id), tostring(ip), tostring(port) ) |
| 592 | if interface.noreading or interface.fatalerror then -- leave this event |
| 593 | --vdebug( "leaving this event because:", tostring(interface.noreading or interface.fatalerror) ) |
| 594 | interface.eventread = nil |
| 595 | return -1 |
| 596 | end |
| 597 | if EV_TIMEOUT == event then -- took too long to get some data from client -> disconnect |
| 598 | interface.fatalerror = "timeout during receiving" |
| 599 | debug( "connection failed:", interface.fatalerror ) |
| 600 | interface:_close() |
| 601 | interface.eventread = nil |
| 602 | return -1 |
| 603 | else -- can read |
| 604 | if interface._usingssl then -- handle luasec |
| 605 | if interface.eventwritetimeout then -- ok, in the past writecallback was regged |
| 606 | local ret = interface.writecallback( ) -- call it |
| 607 | --vdebug( "tried to write in readcallback, result:", tostring(ret) ) |
| 608 | end |
| 609 | if interface.eventreadtimeout then |
| 610 | interface.eventreadtimeout:close( ) |
| 611 | interface.eventreadtimeout = nil |
| 612 | end |
| 613 | end |
| 614 | local buffer, err, part = interface.conn:receive( interface._pattern ) -- receive buffer with "pattern" |
| 615 | --vdebug( "read data:", tostring(buffer), "error:", tostring(err), "part:", tostring(part) ) |
| 616 | buffer = buffer or part or "" |
| 617 | local len = string_len( buffer ) |
| 618 | if len > cfg.MAX_READ_LENGTH then -- check buffer length |
| 619 | interface.fatalerror = "receive buffer exceeded" |
| 620 | debug( "fatal error:", interface.fatalerror ) |
| 621 | interface:_close() |
| 622 | interface.eventread = nil |
| 623 | return -1 |
| 624 | end |
| 625 | interface.onincoming( interface, buffer, err ) -- send new data to listener |
| 626 | if err and ( err ~= "timeout" and err ~= "wantread" ) then |
| 627 | if "wantwrite" == err then -- need to read on write event |
| 628 | if not interface.eventwrite then -- register new write event if needed |
| 629 | interface.eventwrite = addevent( base, interface.conn, EV_WRITE, interface.writecallback, cfg.WRITE_TIMEOUT ) |
| 630 | end |
| 631 | interface.eventreadtimeout = addevent( base, nil, EV_TIMEOUT, |
| 632 | function( ) |
| 633 | interface:_close() |
| 634 | end, cfg.READ_TIMEOUT |
| 635 | ) |
| 636 | debug( "wantwrite during read attempt, reg it in writecallback but dont know what really happens next..." ) |
| 637 | -- to be honest i dont know what happens next, if it is allowed to first read, the write etc... |
| 638 | else -- connection was closed or fatal error |
| 639 | interface.fatalerror = err |
| 640 | debug( "connection failed in read event:", interface.fatalerror ) |
| 641 | interface:_close() |
| 642 | interface.eventread = nil |
| 643 | return -1 |
| 644 | end |
| 645 | end |
| 646 | return EV_READ, cfg.READ_TIMEOUT |
| 647 | end |
| 648 | end |
| 649 | |
| 650 | client:settimeout( 0 ) -- set non blocking |
| 651 | setmetatable(interface, interface_mt) |
| 652 | interfacelist( "add", interface ) -- add to interfacelist |
| 653 | return interface |
| 654 | end |
| 655 | end |
| 656 | |
| 657 | local handleserver |
| 658 | do |
| 659 | function handleserver( server, addr, port, pattern, listener, sslctx ) -- creates an server interface |
| 660 | debug "creating server interface..." |
| 661 | local interface = { |
| 662 | _connections = 0; |
| 663 | |
| 664 | conn = server; |
| 665 | onconnect = listener.onconnect; -- will be called when new client connected |
| 666 | eventread = false; -- read event handler |
| 667 | eventclose = false; -- close event handler |
| 668 | readcallback = false; -- read event callback |
| 669 | fatalerror = false; -- error message |
| 670 | nointerface = true; -- lock/unlock parameter |
| 671 | |
| 672 | _ip = addr, _port = port, _pattern = pattern, |
| 673 | _sslctx = sslctx; |
| 674 | } |
| 675 | interface.id = tostring(interface):match("%x+$"); |
| 676 | interface.readcallback = function( event ) -- server handler, called on incoming connections |
| 677 | --vdebug( "server can accept, id/addr/port:", interface, addr, port ) |
| 678 | if interface.fatalerror then |
| 679 | --vdebug( "leaving this event because:", self.fatalerror ) |
| 680 | interface.eventread = nil |
| 681 | return -1 |
| 682 | end |
| 683 | local delay = cfg.ACCEPT_DELAY |
| 684 | if EV_TIMEOUT == event then |
| 685 | if interface._connections >= cfg.MAX_CONNECTIONS then -- check connection count |
| 686 | debug( "to many connections, seconds to wait for next accept:", delay ) |
| 687 | return EV_TIMEOUT, delay -- timeout... |
| 688 | else |
| 689 | return EV_READ -- accept again |
| 690 | end |
| 691 | end |
| 692 | --vdebug("max connection check ok, accepting...") |
| 693 | local client, err = server:accept() -- try to accept; TODO: check err |
| 694 | while client do |
| 695 | if interface._connections >= cfg.MAX_CONNECTIONS then |
| 696 | client:close( ) -- refuse connection |
| 697 | debug( "maximal connections reached, refuse client connection; accept delay:", delay ) |
| 698 | return EV_TIMEOUT, delay -- delay for next accept attempt |
| 699 | end |
| 700 | local client_ip, client_port = client:getpeername( ) |
| 701 | interface._connections = interface._connections + 1 -- increase connection count |
| 702 | local clientinterface = handleclient( client, client_ip, client_port, interface, pattern, listener, nil, sslctx ) |
| 703 | --vdebug( "client id:", clientinterface, "startssl:", startssl ) |
| 704 | if ssl and sslctx then |
| 705 | clientinterface:starttls(sslctx, true) |
| 706 | else |
| 707 | clientinterface:_start_session( true ) |
| 708 | end |
| 709 | debug( "accepted incoming client connection from:", client_ip or "<unknown IP>", client_port or "<unknown port>", "to", port or "<unknown port>"); |
| 710 | |
| 711 | client, err = server:accept() -- try to accept again |
| 712 | end |
| 713 | return EV_READ |
| 714 | end |
| 715 | |
| 716 | server:settimeout( 0 ) |
| 717 | setmetatable(interface, interface_mt) |
| 718 | interfacelist( "add", interface ) |
| 719 | interface:_start_session() |
| 720 | return interface |
| 721 | end |
| 722 | end |
| 723 | |
| 724 | local addserver = ( function( ) |
| 725 | return function( addr, port, listener, pattern, sslcfg, startssl ) -- TODO: check arguments |
| 726 | --vdebug( "creating new tcp server with following parameters:", addr or "nil", port or "nil", sslcfg or "nil", startssl or "nil") |
| 727 | local server, err = socket.bind( addr, port, cfg.ACCEPT_QUEUE ) -- create server socket |
| 728 | if not server then |
| 729 | debug( "creating server socket failed because:", err ) |
| 730 | return nil, err |
| 731 | end |
| 732 | local sslctx |
| 733 | if sslcfg then |
| 734 | if not ssl then |
| 735 | debug "fatal error: luasec not found" |
| 736 | return nil, "luasec not found" |
| 737 | end |
| 738 | sslctx, err = sslcfg |
| 739 | if err then |
| 740 | debug( "error while creating new ssl context for server socket:", err ) |
| 741 | return nil, err |
| 742 | end |
| 743 | end |
| 744 | local interface = handleserver( server, addr, port, pattern, listener, sslctx, startssl ) -- new server handler |
| 745 | debug( "new server created with id:", tostring(interface)) |
| 746 | return interface |
| 747 | end |
| 748 | end )( ) |
| 749 | |
| 750 | local addclient, wrapclient |
| 751 | do |
| 752 | function wrapclient( client, ip, port, listeners, pattern, sslctx, startssl ) |
| 753 | local interface = handleclient( client, ip, port, nil, pattern, listeners, sslctx ) |
| 754 | interface:_start_session() |
| 755 | return interface, client |
| 756 | --function handleclient( client, ip, port, server, pattern, listener, _, sslctx ) -- creates an client interface |
| 757 | end |
| 758 | |
| 759 | function addclient( addr, serverport, listener, pattern, localaddr, localport, sslcfg, startssl ) |
| 760 | local client, err = socket.tcp() -- creating new socket |
| 761 | if not client then |
| 762 | debug( "cannot create socket:", err ) |
| 763 | return nil, err |
| 764 | end |
| 765 | client:settimeout( 0 ) -- set nonblocking |
| 766 | if localaddr then |
| 767 | local res, err = client:bind( localaddr, localport, -1 ) |
| 768 | if not res then |
| 769 | debug( "cannot bind client:", err ) |
| 770 | return nil, err |
| 771 | end |
| 772 | end |
| 773 | local sslctx |
| 774 | if sslcfg then -- handle ssl/new context |
| 775 | if not ssl then |
| 776 | debug "need luasec, but not available" |
| 777 | return nil, "luasec not found" |
| 778 | end |
| 779 | sslctx, err = sslcfg |
| 780 | if err then |
| 781 | debug( "cannot create new ssl context:", err ) |
| 782 | return nil, err |
| 783 | end |
| 784 | end |
| 785 | local res, err = client:connect( addr, serverport ) -- connect |
| 786 | if res or ( err == "timeout" ) then |
| 787 | local ip, port = client:getsockname( ) |
| 788 | local server = function( ) |
| 789 | return nil, "this is a dummy server interface" |
| 790 | end |
| 791 | local interface = wrapclient( client, ip, serverport, listener, pattern, sslctx, startssl ) |
| 792 | interface:_start_connection( startssl ) |
| 793 | debug( "new connection id:", interface.id ) |
| 794 | return interface, err |
| 795 | else |
| 796 | debug( "new connection failed:", err ) |
| 797 | return nil, err |
| 798 | end |
| 799 | end |
| 800 | end |
| 801 | |
| 802 | |
| 803 | local loop = function( ) -- starts the event loop |
| 804 | base:loop( ) |
| 805 | return "quitting"; |
| 806 | end |
| 807 | |
| 808 | local newevent = ( function( ) |
| 809 | local add = base.addevent |
| 810 | return function( ... ) |
| 811 | return add( base, ... ) |
| 812 | end |
| 813 | end )( ) |
| 814 | |
| 815 | local closeallservers = function( arg ) |
| 816 | for _, item in ipairs( interfacelist( ) ) do |
| 817 | if item.type == "server" then |
| 818 | item:close( arg ) |
| 819 | end |
| 820 | end |
| 821 | end |
| 822 | |
| 823 | local function setquitting(yes) |
| 824 | if yes then |
| 825 | -- Quit now |
| 826 | closeallservers(); |
| 827 | base:loopexit(); |
| 828 | end |
| 829 | end |
| 830 | |
| 831 | function get_backend() |
| 832 | return base:method(); |
| 833 | end |
| 834 | |
| 835 | -- We need to hold onto the events to stop them |
| 836 | -- being garbage-collected |
| 837 | local signal_events = {}; -- [signal_num] -> event object |
| 838 | function hook_signal(signal_num, handler) |
| 839 | local function _handler(event) |
| 840 | local ret = handler(); |
| 841 | if ret ~= false then -- Continue handling this signal? |
| 842 | return EV_SIGNAL; -- Yes |
| 843 | end |
| 844 | return -1; -- Close this event |
| 845 | end |
| 846 | signal_events[signal_num] = base:addevent(signal_num, EV_SIGNAL, _handler); |
| 847 | return signal_events[signal_num]; |
| 848 | end |
| 849 | |
| 850 | local function link(sender, receiver, buffersize) |
| 851 | local sender_locked; |
| 852 | |
| 853 | function receiver:ondrain() |
| 854 | if sender_locked then |
| 855 | sender:resume(); |
| 856 | sender_locked = nil; |
| 857 | end |
| 858 | end |
| 859 | |
| 860 | function sender:onincoming(data) |
| 861 | receiver:write(data); |
| 862 | if receiver.writebufferlen >= buffersize then |
| 863 | sender_locked = true; |
| 864 | sender:pause(); |
| 865 | end |
| 866 | end |
| 867 | end |
| 868 | |
| 869 | return { |
| 870 | |
| 871 | cfg = cfg, |
| 872 | base = base, |
| 873 | loop = loop, |
| 874 | link = link, |
| 875 | event = event, |
| 876 | event_base = base, |
| 877 | addevent = newevent, |
| 878 | addserver = addserver, |
| 879 | addclient = addclient, |
| 880 | wrapclient = wrapclient, |
| 881 | setquitting = setquitting, |
| 882 | closeall = closeallservers, |
| 883 | get_backend = get_backend, |
| 884 | hook_signal = hook_signal, |
| 885 | |
| 886 | __NAME = SCRIPT_NAME, |
| 887 | __DATE = LAST_MODIFIED, |
| 888 | __AUTHOR = SCRIPT_AUTHOR, |
| 889 | __VERSION = SCRIPT_VERSION, |
| 890 | |
| 891 | } |