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index.js
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var net = require('net');
var tls = require('tls');
var url = require('url');
var socks = require('socksv5');
var crypto = require('crypto');
var EventEmitter = require('events').EventEmitter;
var Buffer = require('safe-buffer').Buffer;
var LRU = require('lru-cache');
var checkSNI = require('sni');
var util = require('../util');
var extend = require('extend');
var config = require('../config');
var rules = require('../rules');
var pluginMgr = require('../plugins');
var socketMgr = require('../socket-mgr');
var hparser = require('hparser');
var ca = require('./ca');
var getRawHeaders = hparser.getRawHeaders;
var parseReq = hparser.parse;
var getDomain = ca.getDomain;
var serverAgent = ca.serverAgent;
var getSNIServer = ca.getSNIServer;
var LOCALHOST = '127.0.0.1';
var tunnelTmplData = new LRU({max: 3000, maxAge: 30000});
var TIMEOUT = 5000;
var LOCAL_TIMEOUT = 3000;
var AUTH_TIMEOUT = 3000;
var INTERNAL_PROXY_RE = /^x?internal-proxy:\/\//;
var HS2H_PROXY_RE = /^x?https2http-proxy:\/\//;
var H2HS_PROXY_RE = /^x?http2https-proxy:\/\//;
var SOCKS_PROXY_RE = /^x?socks:\/\//;
var HTTPS_PROXY_RE = /^x?https-proxy:\/\//;
var X_RE = /^x/;
var proxy, server;
function handleWebsocket(socket, clientIp, clientPort) {
var wss = socket.isHttps;
clientIp = util.removeIPV6Prefix(clientIp || socket.remoteAddress);
socket.clientIp = clientIp;
socket.method = 'GET';
socket.reqId = util.getReqId();
socket.clientPort = clientPort || socket.remotePort;
pluginMgr.resolvePipePlugin(socket, function() {
socket.rules = rules.initRules(socket);
var urlParamsRule = socket.rules.urlParams;
util.parseRuleJson(urlParamsRule, function(urlParams) {
if (urlParams) {
var _url = util.replaceUrlQueryString(socket.url, urlParams);
if (socket.url !== _url) {
socket.url = _url;
socket.fullUrl = util.getFullUrl(socket).replace('http', 'ws');
socket.curUrl = socket.fullUrl;
socket.rules = rules.resolveRules(socket);
socket.rules.urlParams = urlParamsRule;
if (socket.headerRulesMgr) {
var _rules = socket.rules;
socket.rules = socket.headerRulesMgr.resolveRules(socket);
util.mergeRules(socket, _rules);
}
}
}
resolveWebsocket(socket, wss);
});
});
}
function resolveWebsocket(socket, wss) {
var headers = socket.headers;
var reqEmitter = new EventEmitter();
var fullUrl = socket.fullUrl;
var _rules = socket.rules;
var clientIp = socket.clientIp;
rules.resolveRulesFile(socket, function() {
var filter = socket.filter;
var now = Date.now();
var reqData = {
ip: clientIp,
port: socket.clientPort,
method: 'GET',
httpVersion: socket.httpVersion || '1.1',
headers: headers,
rawHeaderNames: socket.rawHeaderNames
};
var resData = {};
var data = reqEmitter.data = {
id: socket.reqId,
url: fullUrl,
startTime: now,
rules: _rules,
req: reqData,
res: resData,
pipe: socket._pipeRule,
rulesHeaders: socket.rulesHeaders
};
var reqSocket, options, pluginRules, matchedUrl, isInternalProxy, done, proxyUrl;
var timeout = util.setTimeout(function() {
destroy(new Error('Timeout'));
});
var response = function() {
var statusCode = util.getMatcherValue(_rules.statusCode);
if (!statusCode) {
return;
}
var status = util.getStatusCode(statusCode);
var resHeaders = resData.headers = {};
var body = '';
var statusMsg;
if (status === 101) {
statusMsg = 'HTTP/1.1 101 Switching Protocols';
var protocol = (headers['sec-websocket-protocol'] || '').split(/, */);
var key = headers['sec-websocket-key'] + '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';
key = crypto.createHash('sha1')
.update(key, 'binary')
.digest('base64');
resHeaders['Sec-WebSocket-Accept'] = key;
resHeaders.Upgrade = 'websocket';
resHeaders.Connection = 'Upgrade';
if (protocol[0]) {
resHeaders['Sec-WebSocket-Protocol'] = protocol[0];
}
reqSocket = util.getEmptyRes();
reqSocket.headers = resHeaders;
socketMgr.handleUpgrade(socket, reqSocket);
} else {
if (!status) {
status = 502;
body = 'Invalid status code: ' + statusCode;
resHeaders['Content-Type'] = 'text/html; charset=utf8';
resHeaders['Content-Length'] = Buffer.byteLength(body) + '';
}
resHeaders.Connection = 'close';
statusMsg = 'HTTP/1.1 ' + status;
}
resData.statusCode = status;
resData.body = body;
data.requestTime = data.dnsTime =Date.now();
var rawData = statusMsg + '\r\n' + getRawHeaders(resHeaders) + '\r\n\r\n' + body;
var end = function() {
data.responseTime = data.endTime = Date.now();
socket.write(rawData);
reqEmitter.emit('end', data);
};
var reqDelay = util.getMatcherValue(_rules.reqDelay) | 0;
var resDelay = util.getMatcherValue(_rules.resDelay) | 0;
var delay = reqDelay + resDelay;
if (delay > 0) {
clearTimeout(timeout);
setTimeout(end, delay);
} else {
end();
}
return true;
};
var plugin = pluginMgr.resolveWhistlePlugins(socket);
pluginMgr.getRules(socket, function(rulesMgr) {
if (pluginRules = rulesMgr) {
socket.curUrl = fullUrl;
util.mergeRules(socket, rulesMgr.resolveRules(socket));
if (util.isIgnored(filter, 'rule')) {
plugin = null;
} else {
plugin = pluginMgr.getPluginByRuleUrl(util.rule.getUrl(_rules.rule));
}
}
var ruleUrlValue = plugin ? null : util.rule.getUrl(_rules.rule);
if (ruleUrlValue && fullUrl !== ruleUrlValue && /^(ws|http)s?:\/\//.test(ruleUrlValue)) {
if (RegExp.$1 === 'http') {
ruleUrlValue = ruleUrlValue.replace('http', 'ws');
}
data.realUrl = fullUrl = matchedUrl = util.encodeNonLatin1Char(ruleUrlValue);
}
if (_rules.referer) {
var referer = util.getMatcherValue(_rules.referer);
headers.referer = referer;
}
if (_rules.ua) {
var ua = util.getMatcherValue(_rules.ua);
headers['user-agent'] = ua;
}
if (!filter.hide) {
data.abort = destroy;
proxy.emit('request', reqEmitter);
}
if (socket.enable.abort || filter.abort) {
return destroy();
}
if (response()) {
return;
}
pluginMgr.loadPlugin(plugin, function(err, ports) {
if (err) {
return execCallback(err);
}
options = util.parseUrl(fullUrl);
var port = ports && ports.port;
if (port) {
options.port = port;
data.realUrl = util.changePort(fullUrl, options.port);
socket.customParser = util.getParserStatus(socket);
pluginMgr.addRuleHeaders(socket, _rules);
socketMgr.setPending(socket);
options.protocol = 'ws:';
socket.headers[config.PLUGIN_HOOK_NAME_HEADER] = config.PLUGIN_HOOKS.HTTP;
connectServer();
return;
}
plugin = null;
rules.getProxy(fullUrl, plugin ? null : socket, function(err, hostIp, hostPort) {
proxyUrl = !plugin && _rules.proxy ? util.rule.getMatcher(_rules.proxy) : null;
if (proxyUrl) {
var isXProxy = X_RE.test(proxyUrl);
var isSocks = SOCKS_PROXY_RE.test(proxyUrl);
var isHttpsProxy = !isSocks && HTTPS_PROXY_RE.test(proxyUrl);
isInternalProxy = INTERNAL_PROXY_RE.test(proxyUrl);
var isHttps2HttpProxy = isInternalProxy || HS2H_PROXY_RE.test(proxyUrl);
if (!isHttps2HttpProxy && !wss && H2HS_PROXY_RE.test(proxyUrl)) {
wss = true;
} else {
wss = options.protocol === 'wss:';
}
proxyUrl = 'http:' + util.removeProtocol(proxyUrl);
getServerIp(proxyUrl, function(ip) {
var proxyOptions = url.parse(proxyUrl);
proxyOptions.port = parseInt(proxyOptions.port, 10) || (isSocks ? 1080 : (isHttpsProxy ? 443 : 80));
var isProxyPort = proxyOptions.port == config.port;
if (isProxyPort && util.isLocalAddress(ip)) {
return execCallback(new Error('Self loop (' + ip + ':' + config.port + ')'));
}
options.proxyHost = ip;
resData.port = options.proxyPort = proxyOptions.port;
options.host = options.hostname;
if (!options.port) {
options.port = wss ? 443 : 80;
}
var handleProxy = function(proxySocket) {
if (wss) {
proxySocket = tls.connect({
rejectUnauthorized: false,
socket: proxySocket,
servername: options.hostname
}).on('error', execCallback);
}
reqSocket = proxySocket;
abortIfUnavailable(reqSocket);
pipeData();
};
if (isSocks) {
options.localDNS = false;
options.auths = config.getAuths(proxyOptions);
} else {
var proxyHeaders = options.headers = socket.disable.proxyUA ? {} :
{ 'user-agent': config.PROXY_UA };
if (!util.isLocalAddress(clientIp)) {
proxyHeaders[config.CLIENT_IP_HEAD] = clientIp;
}
if(isProxyPort) {
proxyHeaders[config.WEBUI_HEAD] = 1;
} else if (isHttps2HttpProxy) {
if (isInternalProxy) {
if (wss) {
headers[config.HTTPS_FIELD] = 1;
}
proxyHeaders[config.WHISTLE_POLICY_HEADER] = 'intercept';
}
wss = false;
}
util.checkIfAddInterceptPolicy(proxyHeaders, headers);
util.setClientId(proxyHeaders, socket.enable, socket.disable, clientIp);
options.proxyAuth = proxyOptions.auth;
}
var netMgr = isSocks ? socks : config;
var reqDelay = util.getMatcherValue(_rules.reqDelay);
var proxyOpts = util.setProxyHost(socket, options);
if (isHttpsProxy) {
proxyOpts.proxyServername = proxyOptions.hostname;
}
var connectProxy = function() {
if (destroyed) {
return;
}
var s = netMgr.connect(proxyOpts, handleProxy);
s.on('error', isXProxy ? directConnect : execCallback);
};
if (reqDelay > 0) {
clearTimeout(timeout);
setTimeout(function() {
timeout = util.setTimeout(function() {
destroy(new Error('Timeout'));
});
connectProxy();
}, reqDelay);
} else {
connectProxy();
}
});
} else {
directConnect(hostIp, hostPort);
}
});
});
});
function directConnect(hostIp, hostPort) {
if (typeof hostIp !== 'string') {
hostIp = null;
}
connectServer(hostIp, hostPort);
}
var retryConnect;
var auto2http;
var retryXHost = 0;
function connectServer(hostIp, hostPort) {
getServerIp(fullUrl, function(ip, port) {
var isWss = options.protocol === 'wss:';
var _port = port;
resData.port = port = port || options.port || (isWss ? 443 : 80);
if (destroyed) {
return;
}
// checkHandUpError, retry
reqSocket = (isWss ? tls : net).connect({
rejectUnauthorized: false,
host: ip,
port: port,
servername: options.hostname
}, pipeData);
if (retryConnect) {
abortIfUnavailable(reqSocket);
} else {
retryConnect = function(e) {
if (retryXHost < 2 && _rules.host && X_RE.test(_rules.host.matcher)) {
++retryXHost;
retryConnect = false;
if (retryXHost > 1) {
socket.curUrl = fullUrl;
rules.lookupHost(socket, function(err, _ip) {
socket.hostIp = resData.ip = _ip || LOCALHOST;
if (err) {
return execCallback(err);
}
connectServer(_ip);
});
return;
}
} else if (isWss && util.checkAuto2Http(socket, ip)) {
if (auto2http || util.checkTlsError(e)) {
options.protocol = null;
} else {
retryConnect = false;
auto2http = true;
}
}
connectServer(ip, _port);
};
reqSocket.once('error', retryConnect);
}
}, hostIp, hostPort);
}
function pipeData() {
if (retryConnect) {
reqSocket.removeListener('error', retryConnect);
abortIfUnavailable(reqSocket);
retryConnect = null;
}
clearTimeout(timeout);
var resDelay = util.getMatcherValue(_rules.resDelay);
if (resDelay > 0) {
setTimeout(_pipeData, resDelay);
} else {
_pipeData();
}
}
function _pipeData() {
var headers = socket.headers;
var origin;
if (matchedUrl) {
headers.host = options.host;
origin = headers.origin;
headers.origin = (options.protocol == 'wss:' ? 'https://' : 'http://') + options.host;
}
var reqCors = util.getReqCors(_rules.reqCors);
var cors = reqCors ? null : _rules.reqCors;
util.parseRuleJson([_rules.reqHeaders, cors, _rules.reqCookies, _rules.params, _rules.urlReplace],
function(reqHeaders, _reqCors, reqCookies, params, urlReplace) {
var customXFF;
if (reqHeaders) {
reqHeaders = util.lowerCaseify(reqHeaders, socket.rawHeaderNames);
customXFF = reqHeaders['x-forwarded-for'];
extend(headers, reqHeaders);
}
var reqRuleData = { headers: headers };
util.setReqCors(reqRuleData, _reqCors || reqCors);
util.setReqCookies(reqRuleData, reqCookies, headers.cookie);
if (params) {
var _url = util.replaceUrlQueryString(fullUrl, params);
if (fullUrl !== _url) {
data.realUrl = fullUrl = _url;
options = util.parseUrl(fullUrl);
}
}
data.realUrl = fullUrl = util.parsePathReplace(fullUrl, urlReplace) || fullUrl;
if (socket.disable.clientIp || socket.disable.clientIP) {
delete headers[config.CLIENT_IP_HEAD];
} else {
var forwardedFor = util.getMatcherValue(_rules.forwardedFor);
if (forwardedFor) {
headers[config.CLIENT_IP_HEAD] = forwardedFor;
} else if (!customXFF && !config.keepXFF
&& (!plugin || util.isLocalAddress(headers[config.CLIENT_IP_HEAD]))) {
delete headers[config.CLIENT_IP_HEAD];
}
}
if (_rules.referer) {
headers.referer = util.getMatcherValue(_rules.referer);
}
var delReqHeaders = util.parseDeleteProperties(socket).reqHeaders;
Object.keys(delReqHeaders).forEach(function(name) {
delete headers[name];
});
util.disableReqProps(socket);
proxyUrl ? util.setClientId(headers, socket.enable, socket.disable, clientIp) : util.removeClientId(headers);
reqSocket.write(socket.getBuffer(headers, options.path));
delete headers[config.HTTPS_FIELD];
parseReq(reqSocket, function(err, res) {
if (err) {
return execCallback(err);
}
socket.statusCode = res.statusCode || '';
socket.resHeaders = res.headers;
pluginMgr.getResRules(socket, res, function() {
var cors = _rules.resCors;
var resCors = util.parseResCors(cors);
if (resCors) {
cors = null;
}
util.parseRuleJson([_rules.resHeaders, cors, _rules.resCookies],
function(resHeaders, cors, cookies) {
reqSocket.headers = headers = extend(res.headers, resHeaders);
if (matchedUrl) {
headers['access-control-allow-origin'] = origin;
}
var resRuleData = { headers: headers };
util.setResCors(resRuleData, resCors, cors, socket.headers.origin);
util.setResCookies(resRuleData, cookies);
util.setResponseFor(_rules, headers, socket.headers, socket.hostIp);
var delResHeaders = util.parseDeleteProperties(socket).resHeaders;
Object.keys(delResHeaders).forEach(function(name) {
delete headers[name];
});
util.disableResProps(socket, headers);
socket.write(res.getBuffer(headers));
reqSocket.reqId = data.id;
if (res.statusCode == 101) {
socketMgr.handleUpgrade(socket, reqSocket);
} else {
resData.body = res.body;
socket.destroy();
}
resData.headers = headers;
resData.rawHeaderNames = res.rawHeaderNames;
resData.statusCode = res.statusCode;
reqEmitter.emit('response', data);
execCallback(null, reqSocket);
});
});
}, true);
});
}
function getServerIp(url, callback, hostIp, hostPort) {
if (plugin) {
return callback(LOCALHOST);
}
var hostHandler = function(err, ip, port, host) {
if (err) {
return execCallback(err);
}
if (host) {
_rules.host = host;
}
socket.hostIp = resData.ip = util.getHostIp(ip, port);
data.requestTime = data.dnsTime = Date.now();
reqEmitter.emit('send', data);
callback(ip, port);
};
if (hostIp) {
hostHandler(null, hostIp, hostPort);
} else {
socket.curUrl = url;
rules.resolveHost(socket, hostHandler, pluginRules, socket.rulesFileMgr, socket.headerRulesMgr);
}
}
function abortIfUnavailable(socket) {
return socket.on('error', destroy).on('close', destroy);
}
var destroyed;
function destroy(err) {
if (destroyed) {
return;
}
destroyed = true;
socket.destroy();
reqSocket && reqSocket.destroy();
execCallback(err);
}
function execCallback(err, _socket) {
if (done) {
return;
}
done = true;
clearTimeout(timeout);
data.responseTime = data.endTime = Date.now();
socket.hostIp = resData.ip = resData.ip || LOCALHOST;
if (!err && !_socket) {
err = new Error('Aborted');
data.reqError = true;
resData.statusCode ='aborted';
reqData.body = util.getErrorStack(err);
reqEmitter.emit('abort', data);
} else if (err) {
data.resError = true;
resData.statusCode = resData.statusCode || 502;
resData.body = util.getErrorStack(err);
util.emitError(reqEmitter, data);
} else {
reqEmitter.emit('end', data);
}
if (err) {
resData.headers = {'x-server':'whistle' };
pluginMgr.getResRules(socket, resData, util.noop);
}
}
});
}
function addReqInfo(req) {
var clientPort = req.socket.remotePort;
var serverPort = req.socket.localPort;
var remoteData = tunnelTmplData.get(clientPort + ':' + serverPort);
req.headers[config.HTTPS_FIELD] = 1;
if (remoteData) {
req.headers[config.CLIENT_IP_HEAD] = remoteData.clientIp || LOCALHOST;
req.headers[config.CLIENT_PORT_HEAD] = remoteData.clientPort;
}
}
var handlers = {
request: function(req, res) {
addReqInfo(req);
server.emit('request', req, res);
},
upgrade: function(req, socket) {
addReqInfo(req);
server.emit('upgrade', req, socket);
}
};
var CONNECT_RE = /^CONNECT\s+(\S+)\s+HTTP\/1.\d$/mi;
var HTTP_RE = /^\w+\s+\S+\s+HTTP\/1.\d$/mi;
module.exports = function(socket, hostname, next, isWebPort) {
var reqSocket, destroyed, timer;
var tunnelHost = socket.tunnelHost;
var isConnect, headersStr;
function destroy(err) {
if (destroyed) {
return;
}
destroyed = true;
socket.destroy(err);
reqSocket && reqSocket.destroy();
}
function abortIfUnavailable(socket) {
return socket.on('error', destroy);
}
socket.on('data', request);
socket.on('end', request);
var clientIp = socket.clientIp;
var timeout = isWebPort ? null : (util.isLocalAddress(clientIp) ? LOCAL_TIMEOUT : TIMEOUT);
timer = timeout && setTimeout(request, timeout);
function request(chunk) {
clearTimeout(timer);
headersStr = chunk && chunk.toString();
if (chunk && !isConnect && CONNECT_RE.test(headersStr)) {
isConnect = true;
tunnelHost = RegExp.$1;
hostname = tunnelHost.split(':')[0];
timer = timeout && setTimeout(request, timeout);
util.setEstablished(socket);
return;
}
socket.removeListener('data', request);
socket.removeListener('end', request);
if (!chunk) {//没有数据
return isWebPort ? socket.destroy() : next(chunk);
}
var clientPort = socket.remotePort;
if (HTTP_RE.test(headersStr)) {
socket.test = clientPort;
var statusLine = RegExp['$&'];
var len = Buffer.byteLength(statusLine);
server.emit('connection', socket);
chunk = chunk.slice(len);
statusLine += '\r\n' + config.CLIENT_INFO_HEAD + ': ' + clientIp + ',' + clientPort;
socket.emit('data', Buffer.concat([Buffer.from(statusLine), chunk]));
} else if (chunk[0] != 22) {
next(chunk);
} else {
var domain = getDomain(hostname);
var recieveData, authTimer;
var useSNI = !serverAgent.existsServer(domain) && checkSNI(chunk);
socket.pause();
var checkTimeout = function() {
authTimer = setTimeout(function() {
if (reqSocket) {
recieveData && reqSocket.removeListener('data', recieveData);
reqSocket.destroy();
}
if (useSNI) {
useSNI = false;
useNoSNIServer();
} else {
next(chunk);
}
}, AUTH_TIMEOUT);
};
var handleConnect = function(port) {
util.connect({
port: port,
host: LOCALHOST,
localAddress: LOCALHOST
}, function(err, s) {
if (err) {
return destroy(err);
}
reqSocket = s;
tunnelTmplData.set(reqSocket.localPort + ':' + reqSocket.remotePort, {
clientIp: clientIp,
clientPort: socket.remotePort,
tunnelHost: tunnelHost
});
recieveData = function(data) {
clearTimeout(authTimer);
authTimer = null;
socket.write(data);
reqSocket.pipe(socket).pipe(reqSocket);
socket.resume();
};
reqSocket.once('data', recieveData);
reqSocket.write(chunk);
abortIfUnavailable(reqSocket);
});
};
var useNoSNIServer = function() {
checkTimeout();
serverAgent.createServer(domain, handlers, handleConnect);
};
if(useSNI) {
checkTimeout();
getSNIServer(handlers, handleConnect);
} else {
useNoSNIServer();
}
}
}
};
module.exports.setup = function(s, p) {
server = s;
proxy = p;
};
module.exports.handleWebsocket = handleWebsocket;