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server/node_modules/socks/build/client/socksclient.js

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+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.SocksClientError = exports.SocksClient = void 0;
+const events_1 = require("events");
+const net = require("net");
+const smart_buffer_1 = require("smart-buffer");
+const constants_1 = require("../common/constants");
+const helpers_1 = require("../common/helpers");
+const receivebuffer_1 = require("../common/receivebuffer");
+const util_1 = require("../common/util");
+Object.defineProperty(exports, "SocksClientError", { enumerable: true, get: function () { return util_1.SocksClientError; } });
+const ip_address_1 = require("ip-address");
+class SocksClient extends events_1.EventEmitter {
+    constructor(options) {
+        super();
+        this.options = Object.assign({}, options);
+        // Validate SocksClientOptions
+        (0, helpers_1.validateSocksClientOptions)(options);
+        // Default state
+        this.setState(constants_1.SocksClientState.Created);
+    }
+    /**
+     * Creates a new SOCKS connection.
+     *
+     * Note: Supports callbacks and promises. Only supports the connect command.
+     * @param options { SocksClientOptions } Options.
+     * @param callback { Function } An optional callback function.
+     * @returns { Promise }
+     */
+    static createConnection(options, callback) {
+        return new Promise((resolve, reject) => {
+            // Validate SocksClientOptions
+            try {
+                (0, helpers_1.validateSocksClientOptions)(options, ['connect']);
+            }
+            catch (err) {
+                if (typeof callback === 'function') {
+                    callback(err);
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    return resolve(err); // Resolves pending promise (prevents memory leaks).
+                }
+                else {
+                    return reject(err);
+                }
+            }
+            const client = new SocksClient(options);
+            client.connect(options.existing_socket);
+            client.once('established', (info) => {
+                client.removeAllListeners();
+                if (typeof callback === 'function') {
+                    callback(null, info);
+                    resolve(info); // Resolves pending promise (prevents memory leaks).
+                }
+                else {
+                    resolve(info);
+                }
+            });
+            // Error occurred, failed to establish connection.
+            client.once('error', (err) => {
+                client.removeAllListeners();
+                if (typeof callback === 'function') {
+                    callback(err);
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    resolve(err); // Resolves pending promise (prevents memory leaks).
+                }
+                else {
+                    reject(err);
+                }
+            });
+        });
+    }
+    /**
+     * Creates a new SOCKS connection chain to a destination host through 2 or more SOCKS proxies.
+     *
+     * Note: Supports callbacks and promises. Only supports the connect method.
+     * Note: Implemented via createConnection() factory function.
+     * @param options { SocksClientChainOptions } Options
+     * @param callback { Function } An optional callback function.
+     * @returns { Promise }
+     */
+    static createConnectionChain(options, callback) {
+        // eslint-disable-next-line no-async-promise-executor
+        return new Promise((resolve, reject) => __awaiter(this, void 0, void 0, function* () {
+            // Validate SocksClientChainOptions
+            try {
+                (0, helpers_1.validateSocksClientChainOptions)(options);
+            }
+            catch (err) {
+                if (typeof callback === 'function') {
+                    callback(err);
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    return resolve(err); // Resolves pending promise (prevents memory leaks).
+                }
+                else {
+                    return reject(err);
+                }
+            }
+            // Shuffle proxies
+            if (options.randomizeChain) {
+                (0, util_1.shuffleArray)(options.proxies);
+            }
+            try {
+                let sock;
+                for (let i = 0; i < options.proxies.length; i++) {
+                    const nextProxy = options.proxies[i];
+                    // If we've reached the last proxy in the chain, the destination is the actual destination, otherwise it's the next proxy.
+                    const nextDestination = i === options.proxies.length - 1
+                        ? options.destination
+                        : {
+                            host: options.proxies[i + 1].host ||
+                                options.proxies[i + 1].ipaddress,
+                            port: options.proxies[i + 1].port,
+                        };
+                    // Creates the next connection in the chain.
+                    const result = yield SocksClient.createConnection({
+                        command: 'connect',
+                        proxy: nextProxy,
+                        destination: nextDestination,
+                        existing_socket: sock,
+                    });
+                    // If sock is undefined, assign it here.
+                    sock = sock || result.socket;
+                }
+                if (typeof callback === 'function') {
+                    callback(null, { socket: sock });
+                    resolve({ socket: sock }); // Resolves pending promise (prevents memory leaks).
+                }
+                else {
+                    resolve({ socket: sock });
+                }
+            }
+            catch (err) {
+                if (typeof callback === 'function') {
+                    callback(err);
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    resolve(err); // Resolves pending promise (prevents memory leaks).
+                }
+                else {
+                    reject(err);
+                }
+            }
+        }));
+    }
+    /**
+     * Creates a SOCKS UDP Frame.
+     * @param options
+     */
+    static createUDPFrame(options) {
+        const buff = new smart_buffer_1.SmartBuffer();
+        buff.writeUInt16BE(0);
+        buff.writeUInt8(options.frameNumber || 0);
+        // IPv4/IPv6/Hostname
+        if (net.isIPv4(options.remoteHost.host)) {
+            buff.writeUInt8(constants_1.Socks5HostType.IPv4);
+            buff.writeUInt32BE((0, helpers_1.ipv4ToInt32)(options.remoteHost.host));
+        }
+        else if (net.isIPv6(options.remoteHost.host)) {
+            buff.writeUInt8(constants_1.Socks5HostType.IPv6);
+            buff.writeBuffer((0, helpers_1.ipToBuffer)(options.remoteHost.host));
+        }
+        else {
+            buff.writeUInt8(constants_1.Socks5HostType.Hostname);
+            buff.writeUInt8(Buffer.byteLength(options.remoteHost.host));
+            buff.writeString(options.remoteHost.host);
+        }
+        // Port
+        buff.writeUInt16BE(options.remoteHost.port);
+        // Data
+        buff.writeBuffer(options.data);
+        return buff.toBuffer();
+    }
+    /**
+     * Parses a SOCKS UDP frame.
+     * @param data
+     */
+    static parseUDPFrame(data) {
+        const buff = smart_buffer_1.SmartBuffer.fromBuffer(data);
+        buff.readOffset = 2;
+        const frameNumber = buff.readUInt8();
+        const hostType = buff.readUInt8();
+        let remoteHost;
+        if (hostType === constants_1.Socks5HostType.IPv4) {
+            remoteHost = (0, helpers_1.int32ToIpv4)(buff.readUInt32BE());
+        }
+        else if (hostType === constants_1.Socks5HostType.IPv6) {
+            remoteHost = ip_address_1.Address6.fromByteArray(Array.from(buff.readBuffer(16))).canonicalForm();
+        }
+        else {
+            remoteHost = buff.readString(buff.readUInt8());
+        }
+        const remotePort = buff.readUInt16BE();
+        return {
+            frameNumber,
+            remoteHost: {
+                host: remoteHost,
+                port: remotePort,
+            },
+            data: buff.readBuffer(),
+        };
+    }
+    /**
+     * Internal state setter. If the SocksClient is in an error state, it cannot be changed to a non error state.
+     */
+    setState(newState) {
+        if (this.state !== constants_1.SocksClientState.Error) {
+            this.state = newState;
+        }
+    }
+    /**
+     * Starts the connection establishment to the proxy and destination.
+     * @param existingSocket Connected socket to use instead of creating a new one (internal use).
+     */
+    connect(existingSocket) {
+        this.onDataReceived = (data) => this.onDataReceivedHandler(data);
+        this.onClose = () => this.onCloseHandler();
+        this.onError = (err) => this.onErrorHandler(err);
+        this.onConnect = () => this.onConnectHandler();
+        // Start timeout timer (defaults to 30 seconds)
+        const timer = setTimeout(() => this.onEstablishedTimeout(), this.options.timeout || constants_1.DEFAULT_TIMEOUT);
+        // check whether unref is available as it differs from browser to NodeJS (#33)
+        if (timer.unref && typeof timer.unref === 'function') {
+            timer.unref();
+        }
+        // If an existing socket is provided, use it to negotiate SOCKS handshake. Otherwise create a new Socket.
+        if (existingSocket) {
+            this.socket = existingSocket;
+        }
+        else {
+            this.socket = new net.Socket();
+        }
+        // Attach Socket error handlers.
+        this.socket.once('close', this.onClose);
+        this.socket.once('error', this.onError);
+        this.socket.once('connect', this.onConnect);
+        this.socket.on('data', this.onDataReceived);
+        this.setState(constants_1.SocksClientState.Connecting);
+        this.receiveBuffer = new receivebuffer_1.ReceiveBuffer();
+        if (existingSocket) {
+            this.socket.emit('connect');
+        }
+        else {
+            this.socket.connect(this.getSocketOptions());
+            if (this.options.set_tcp_nodelay !== undefined &&
+                this.options.set_tcp_nodelay !== null) {
+                this.socket.setNoDelay(!!this.options.set_tcp_nodelay);
+            }
+        }
+        // Listen for established event so we can re-emit any excess data received during handshakes.
+        this.prependOnceListener('established', (info) => {
+            setImmediate(() => {
+                if (this.receiveBuffer.length > 0) {
+                    const excessData = this.receiveBuffer.get(this.receiveBuffer.length);
+                    info.socket.emit('data', excessData);
+                }
+                info.socket.resume();
+            });
+        });
+    }
+    // Socket options (defaults host/port to options.proxy.host/options.proxy.port)
+    getSocketOptions() {
+        return Object.assign(Object.assign({}, this.options.socket_options), { host: this.options.proxy.host || this.options.proxy.ipaddress, port: this.options.proxy.port });
+    }
+    /**
+     * Handles internal Socks timeout callback.
+     * Note: If the Socks client is not BoundWaitingForConnection or Established, the connection will be closed.
+     */
+    onEstablishedTimeout() {
+        if (this.state !== constants_1.SocksClientState.Established &&
+            this.state !== constants_1.SocksClientState.BoundWaitingForConnection) {
+            this.closeSocket(constants_1.ERRORS.ProxyConnectionTimedOut);
+        }
+    }
+    /**
+     * Handles Socket connect event.
+     */
+    onConnectHandler() {
+        this.setState(constants_1.SocksClientState.Connected);
+        // Send initial handshake.
+        if (this.options.proxy.type === 4) {
+            this.sendSocks4InitialHandshake();
+        }
+        else {
+            this.sendSocks5InitialHandshake();
+        }
+        this.setState(constants_1.SocksClientState.SentInitialHandshake);
+    }
+    /**
+     * Handles Socket data event.
+     * @param data
+     */
+    onDataReceivedHandler(data) {
+        /*
+          All received data is appended to a ReceiveBuffer.
+          This makes sure that all the data we need is received before we attempt to process it.
+        */
+        this.receiveBuffer.append(data);
+        // Process data that we have.
+        this.processData();
+    }
+    /**
+     * Handles processing of the data we have received.
+     */
+    processData() {
+        // If we have enough data to process the next step in the SOCKS handshake, proceed.
+        while (this.state !== constants_1.SocksClientState.Established &&
+            this.state !== constants_1.SocksClientState.Error &&
+            this.receiveBuffer.length >= this.nextRequiredPacketBufferSize) {
+            // Sent initial handshake, waiting for response.
+            if (this.state === constants_1.SocksClientState.SentInitialHandshake) {
+                if (this.options.proxy.type === 4) {
+                    // Socks v4 only has one handshake response.
+                    this.handleSocks4FinalHandshakeResponse();
+                }
+                else {
+                    // Socks v5 has two handshakes, handle initial one here.
+                    this.handleInitialSocks5HandshakeResponse();
+                }
+                // Sent auth request for Socks v5, waiting for response.
+            }
+            else if (this.state === constants_1.SocksClientState.SentAuthentication) {
+                this.handleInitialSocks5AuthenticationHandshakeResponse();
+                // Sent final Socks v5 handshake, waiting for final response.
+            }
+            else if (this.state === constants_1.SocksClientState.SentFinalHandshake) {
+                this.handleSocks5FinalHandshakeResponse();
+                // Socks BIND established. Waiting for remote connection via proxy.
+            }
+            else if (this.state === constants_1.SocksClientState.BoundWaitingForConnection) {
+                if (this.options.proxy.type === 4) {
+                    this.handleSocks4IncomingConnectionResponse();
+                }
+                else {
+                    this.handleSocks5IncomingConnectionResponse();
+                }
+            }
+            else {
+                this.closeSocket(constants_1.ERRORS.InternalError);
+                break;
+            }
+        }
+    }
+    /**
+     * Handles Socket close event.
+     * @param had_error
+     */
+    onCloseHandler() {
+        this.closeSocket(constants_1.ERRORS.SocketClosed);
+    }
+    /**
+     * Handles Socket error event.
+     * @param err
+     */
+    onErrorHandler(err) {
+        this.closeSocket(err.message);
+    }
+    /**
+     * Removes internal event listeners on the underlying Socket.
+     */
+    removeInternalSocketHandlers() {
+        // Pauses data flow of the socket (this is internally resumed after 'established' is emitted)
+        this.socket.pause();
+        this.socket.removeListener('data', this.onDataReceived);
+        this.socket.removeListener('close', this.onClose);
+        this.socket.removeListener('error', this.onError);
+        this.socket.removeListener('connect', this.onConnect);
+    }
+    /**
+     * Closes and destroys the underlying Socket. Emits an error event.
+     * @param err { String } An error string to include in error event.
+     */
+    closeSocket(err) {
+        // Make sure only one 'error' event is fired for the lifetime of this SocksClient instance.
+        if (this.state !== constants_1.SocksClientState.Error) {
+            // Set internal state to Error.
+            this.setState(constants_1.SocksClientState.Error);
+            // Destroy Socket
+            this.socket.destroy();
+            // Remove internal listeners
+            this.removeInternalSocketHandlers();
+            // Fire 'error' event.
+            this.emit('error', new util_1.SocksClientError(err, this.options));
+        }
+    }
+    /**
+     * Sends initial Socks v4 handshake request.
+     */
+    sendSocks4InitialHandshake() {
+        const userId = this.options.proxy.userId || '';
+        const buff = new smart_buffer_1.SmartBuffer();
+        buff.writeUInt8(0x04);
+        buff.writeUInt8(constants_1.SocksCommand[this.options.command]);
+        buff.writeUInt16BE(this.options.destination.port);
+        // Socks 4 (IPv4)
+        if (net.isIPv4(this.options.destination.host)) {
+            buff.writeBuffer((0, helpers_1.ipToBuffer)(this.options.destination.host));
+            buff.writeStringNT(userId);
+            // Socks 4a (hostname)
+        }
+        else {
+            buff.writeUInt8(0x00);
+            buff.writeUInt8(0x00);
+            buff.writeUInt8(0x00);
+            buff.writeUInt8(0x01);
+            buff.writeStringNT(userId);
+            buff.writeStringNT(this.options.destination.host);
+        }
+        this.nextRequiredPacketBufferSize =
+            constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks4Response;
+        this.socket.write(buff.toBuffer());
+    }
+    /**
+     * Handles Socks v4 handshake response.
+     * @param data
+     */
+    handleSocks4FinalHandshakeResponse() {
+        const data = this.receiveBuffer.get(8);
+        if (data[1] !== constants_1.Socks4Response.Granted) {
+            this.closeSocket(`${constants_1.ERRORS.Socks4ProxyRejectedConnection} - (${constants_1.Socks4Response[data[1]]})`);
+        }
+        else {
+            // Bind response
+            if (constants_1.SocksCommand[this.options.command] === constants_1.SocksCommand.bind) {
+                const buff = smart_buffer_1.SmartBuffer.fromBuffer(data);
+                buff.readOffset = 2;
+                const remoteHost = {
+                    port: buff.readUInt16BE(),
+                    host: (0, helpers_1.int32ToIpv4)(buff.readUInt32BE()),
+                };
+                // If host is 0.0.0.0, set to proxy host.
+                if (remoteHost.host === '0.0.0.0') {
+                    remoteHost.host = this.options.proxy.ipaddress;
+                }
+                this.setState(constants_1.SocksClientState.BoundWaitingForConnection);
+                this.emit('bound', { remoteHost, socket: this.socket });
+                // Connect response
+            }
+            else {
+                this.setState(constants_1.SocksClientState.Established);
+                this.removeInternalSocketHandlers();
+                this.emit('established', { socket: this.socket });
+            }
+        }
+    }
+    /**
+     * Handles Socks v4 incoming connection request (BIND)
+     * @param data
+     */
+    handleSocks4IncomingConnectionResponse() {
+        const data = this.receiveBuffer.get(8);
+        if (data[1] !== constants_1.Socks4Response.Granted) {
+            this.closeSocket(`${constants_1.ERRORS.Socks4ProxyRejectedIncomingBoundConnection} - (${constants_1.Socks4Response[data[1]]})`);
+        }
+        else {
+            const buff = smart_buffer_1.SmartBuffer.fromBuffer(data);
+            buff.readOffset = 2;
+            const remoteHost = {
+                port: buff.readUInt16BE(),
+                host: (0, helpers_1.int32ToIpv4)(buff.readUInt32BE()),
+            };
+            this.setState(constants_1.SocksClientState.Established);
+            this.removeInternalSocketHandlers();
+            this.emit('established', { remoteHost, socket: this.socket });
+        }
+    }
+    /**
+     * Sends initial Socks v5 handshake request.
+     */
+    sendSocks5InitialHandshake() {
+        const buff = new smart_buffer_1.SmartBuffer();
+        // By default we always support no auth.
+        const supportedAuthMethods = [constants_1.Socks5Auth.NoAuth];
+        // We should only tell the proxy we support user/pass auth if auth info is actually provided.
+        // Note: As of Tor v0.3.5.7+, if user/pass auth is an option from the client, by default it will always take priority.
+        if (this.options.proxy.userId || this.options.proxy.password) {
+            supportedAuthMethods.push(constants_1.Socks5Auth.UserPass);
+        }
+        // Custom auth method?
+        if (this.options.proxy.custom_auth_method !== undefined) {
+            supportedAuthMethods.push(this.options.proxy.custom_auth_method);
+        }
+        // Build handshake packet
+        buff.writeUInt8(0x05);
+        buff.writeUInt8(supportedAuthMethods.length);
+        for (const authMethod of supportedAuthMethods) {
+            buff.writeUInt8(authMethod);
+        }
+        this.nextRequiredPacketBufferSize =
+            constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5InitialHandshakeResponse;
+        this.socket.write(buff.toBuffer());
+        this.setState(constants_1.SocksClientState.SentInitialHandshake);
+    }
+    /**
+     * Handles initial Socks v5 handshake response.
+     * @param data
+     */
+    handleInitialSocks5HandshakeResponse() {
+        const data = this.receiveBuffer.get(2);
+        if (data[0] !== 0x05) {
+            this.closeSocket(constants_1.ERRORS.InvalidSocks5IntiailHandshakeSocksVersion);
+        }
+        else if (data[1] === constants_1.SOCKS5_NO_ACCEPTABLE_AUTH) {
+            this.closeSocket(constants_1.ERRORS.InvalidSocks5InitialHandshakeNoAcceptedAuthType);
+        }
+        else {
+            // If selected Socks v5 auth method is no auth, send final handshake request.
+            if (data[1] === constants_1.Socks5Auth.NoAuth) {
+                this.socks5ChosenAuthType = constants_1.Socks5Auth.NoAuth;
+                this.sendSocks5CommandRequest();
+                // If selected Socks v5 auth method is user/password, send auth handshake.
+            }
+            else if (data[1] === constants_1.Socks5Auth.UserPass) {
+                this.socks5ChosenAuthType = constants_1.Socks5Auth.UserPass;
+                this.sendSocks5UserPassAuthentication();
+                // If selected Socks v5 auth method is the custom_auth_method, send custom handshake.
+            }
+            else if (data[1] === this.options.proxy.custom_auth_method) {
+                this.socks5ChosenAuthType = this.options.proxy.custom_auth_method;
+                this.sendSocks5CustomAuthentication();
+            }
+            else {
+                this.closeSocket(constants_1.ERRORS.InvalidSocks5InitialHandshakeUnknownAuthType);
+            }
+        }
+    }
+    /**
+     * Sends Socks v5 user & password auth handshake.
+     *
+     * Note: No auth and user/pass are currently supported.
+     */
+    sendSocks5UserPassAuthentication() {
+        const userId = this.options.proxy.userId || '';
+        const password = this.options.proxy.password || '';
+        const buff = new smart_buffer_1.SmartBuffer();
+        buff.writeUInt8(0x01);
+        buff.writeUInt8(Buffer.byteLength(userId));
+        buff.writeString(userId);
+        buff.writeUInt8(Buffer.byteLength(password));
+        buff.writeString(password);
+        this.nextRequiredPacketBufferSize =
+            constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5UserPassAuthenticationResponse;
+        this.socket.write(buff.toBuffer());
+        this.setState(constants_1.SocksClientState.SentAuthentication);
+    }
+    sendSocks5CustomAuthentication() {
+        return __awaiter(this, void 0, void 0, function* () {
+            this.nextRequiredPacketBufferSize =
+                this.options.proxy.custom_auth_response_size;
+            this.socket.write(yield this.options.proxy.custom_auth_request_handler());
+            this.setState(constants_1.SocksClientState.SentAuthentication);
+        });
+    }
+    handleSocks5CustomAuthHandshakeResponse(data) {
+        return __awaiter(this, void 0, void 0, function* () {
+            return yield this.options.proxy.custom_auth_response_handler(data);
+        });
+    }
+    handleSocks5AuthenticationNoAuthHandshakeResponse(data) {
+        return __awaiter(this, void 0, void 0, function* () {
+            return data[1] === 0x00;
+        });
+    }
+    handleSocks5AuthenticationUserPassHandshakeResponse(data) {
+        return __awaiter(this, void 0, void 0, function* () {
+            return data[1] === 0x00;
+        });
+    }
+    /**
+     * Handles Socks v5 auth handshake response.
+     * @param data
+     */
+    handleInitialSocks5AuthenticationHandshakeResponse() {
+        return __awaiter(this, void 0, void 0, function* () {
+            this.setState(constants_1.SocksClientState.ReceivedAuthenticationResponse);
+            let authResult = false;
+            if (this.socks5ChosenAuthType === constants_1.Socks5Auth.NoAuth) {
+                authResult = yield this.handleSocks5AuthenticationNoAuthHandshakeResponse(this.receiveBuffer.get(2));
+            }
+            else if (this.socks5ChosenAuthType === constants_1.Socks5Auth.UserPass) {
+                authResult =
+                    yield this.handleSocks5AuthenticationUserPassHandshakeResponse(this.receiveBuffer.get(2));
+            }
+            else if (this.socks5ChosenAuthType === this.options.proxy.custom_auth_method) {
+                authResult = yield this.handleSocks5CustomAuthHandshakeResponse(this.receiveBuffer.get(this.options.proxy.custom_auth_response_size));
+            }
+            if (!authResult) {
+                this.closeSocket(constants_1.ERRORS.Socks5AuthenticationFailed);
+            }
+            else {
+                this.sendSocks5CommandRequest();
+            }
+        });
+    }
+    /**
+     * Sends Socks v5 final handshake request.
+     */
+    sendSocks5CommandRequest() {
+        const buff = new smart_buffer_1.SmartBuffer();
+        buff.writeUInt8(0x05);
+        buff.writeUInt8(constants_1.SocksCommand[this.options.command]);
+        buff.writeUInt8(0x00);
+        // ipv4, ipv6, domain?
+        if (net.isIPv4(this.options.destination.host)) {
+            buff.writeUInt8(constants_1.Socks5HostType.IPv4);
+            buff.writeBuffer((0, helpers_1.ipToBuffer)(this.options.destination.host));
+        }
+        else if (net.isIPv6(this.options.destination.host)) {
+            buff.writeUInt8(constants_1.Socks5HostType.IPv6);
+            buff.writeBuffer((0, helpers_1.ipToBuffer)(this.options.destination.host));
+        }
+        else {
+            buff.writeUInt8(constants_1.Socks5HostType.Hostname);
+            buff.writeUInt8(this.options.destination.host.length);
+            buff.writeString(this.options.destination.host);
+        }
+        buff.writeUInt16BE(this.options.destination.port);
+        this.nextRequiredPacketBufferSize =
+            constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseHeader;
+        this.socket.write(buff.toBuffer());
+        this.setState(constants_1.SocksClientState.SentFinalHandshake);
+    }
+    /**
+     * Handles Socks v5 final handshake response.
+     * @param data
+     */
+    handleSocks5FinalHandshakeResponse() {
+        // Peek at available data (we need at least 5 bytes to get the hostname length)
+        const header = this.receiveBuffer.peek(5);
+        if (header[0] !== 0x05 || header[1] !== constants_1.Socks5Response.Granted) {
+            this.closeSocket(`${constants_1.ERRORS.InvalidSocks5FinalHandshakeRejected} - ${constants_1.Socks5Response[header[1]]}`);
+        }
+        else {
+            // Read address type
+            const addressType = header[3];
+            let remoteHost;
+            let buff;
+            // IPv4
+            if (addressType === constants_1.Socks5HostType.IPv4) {
+                // Check if data is available.
+                const dataNeeded = constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv4;
+                if (this.receiveBuffer.length < dataNeeded) {
+                    this.nextRequiredPacketBufferSize = dataNeeded;
+                    return;
+                }
+                buff = smart_buffer_1.SmartBuffer.fromBuffer(this.receiveBuffer.get(dataNeeded).slice(4));
+                remoteHost = {
+                    host: (0, helpers_1.int32ToIpv4)(buff.readUInt32BE()),
+                    port: buff.readUInt16BE(),
+                };
+                // If given host is 0.0.0.0, assume remote proxy ip instead.
+                if (remoteHost.host === '0.0.0.0') {
+                    remoteHost.host = this.options.proxy.ipaddress;
+                }
+                // Hostname
+            }
+            else if (addressType === constants_1.Socks5HostType.Hostname) {
+                const hostLength = header[4];
+                const dataNeeded = constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseHostname(hostLength); // header + host length + host + port
+                // Check if data is available.
+                if (this.receiveBuffer.length < dataNeeded) {
+                    this.nextRequiredPacketBufferSize = dataNeeded;
+                    return;
+                }
+                buff = smart_buffer_1.SmartBuffer.fromBuffer(this.receiveBuffer.get(dataNeeded).slice(5));
+                remoteHost = {
+                    host: buff.readString(hostLength),
+                    port: buff.readUInt16BE(),
+                };
+                // IPv6
+            }
+            else if (addressType === constants_1.Socks5HostType.IPv6) {
+                // Check if data is available.
+                const dataNeeded = constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv6;
+                if (this.receiveBuffer.length < dataNeeded) {
+                    this.nextRequiredPacketBufferSize = dataNeeded;
+                    return;
+                }
+                buff = smart_buffer_1.SmartBuffer.fromBuffer(this.receiveBuffer.get(dataNeeded).slice(4));
+                remoteHost = {
+                    host: ip_address_1.Address6.fromByteArray(Array.from(buff.readBuffer(16))).canonicalForm(),
+                    port: buff.readUInt16BE(),
+                };
+            }
+            // We have everything we need
+            this.setState(constants_1.SocksClientState.ReceivedFinalResponse);
+            // If using CONNECT, the client is now in the established state.
+            if (constants_1.SocksCommand[this.options.command] === constants_1.SocksCommand.connect) {
+                this.setState(constants_1.SocksClientState.Established);
+                this.removeInternalSocketHandlers();
+                this.emit('established', { remoteHost, socket: this.socket });
+            }
+            else if (constants_1.SocksCommand[this.options.command] === constants_1.SocksCommand.bind) {
+                /* If using BIND, the Socks client is now in BoundWaitingForConnection state.
+                   This means that the remote proxy server is waiting for a remote connection to the bound port. */
+                this.setState(constants_1.SocksClientState.BoundWaitingForConnection);
+                this.nextRequiredPacketBufferSize =
+                    constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseHeader;
+                this.emit('bound', { remoteHost, socket: this.socket });
+                /*
+                  If using Associate, the Socks client is now Established. And the proxy server is now accepting UDP packets at the
+                  given bound port. This initial Socks TCP connection must remain open for the UDP relay to continue to work.
+                */
+            }
+            else if (constants_1.SocksCommand[this.options.command] === constants_1.SocksCommand.associate) {
+                this.setState(constants_1.SocksClientState.Established);
+                this.removeInternalSocketHandlers();
+                this.emit('established', {
+                    remoteHost,
+                    socket: this.socket,
+                });
+            }
+        }
+    }
+    /**
+     * Handles Socks v5 incoming connection request (BIND).
+     */
+    handleSocks5IncomingConnectionResponse() {
+        // Peek at available data (we need at least 5 bytes to get the hostname length)
+        const header = this.receiveBuffer.peek(5);
+        if (header[0] !== 0x05 || header[1] !== constants_1.Socks5Response.Granted) {
+            this.closeSocket(`${constants_1.ERRORS.Socks5ProxyRejectedIncomingBoundConnection} - ${constants_1.Socks5Response[header[1]]}`);
+        }
+        else {
+            // Read address type
+            const addressType = header[3];
+            let remoteHost;
+            let buff;
+            // IPv4
+            if (addressType === constants_1.Socks5HostType.IPv4) {
+                // Check if data is available.
+                const dataNeeded = constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv4;
+                if (this.receiveBuffer.length < dataNeeded) {
+                    this.nextRequiredPacketBufferSize = dataNeeded;
+                    return;
+                }
+                buff = smart_buffer_1.SmartBuffer.fromBuffer(this.receiveBuffer.get(dataNeeded).slice(4));
+                remoteHost = {
+                    host: (0, helpers_1.int32ToIpv4)(buff.readUInt32BE()),
+                    port: buff.readUInt16BE(),
+                };
+                // If given host is 0.0.0.0, assume remote proxy ip instead.
+                if (remoteHost.host === '0.0.0.0') {
+                    remoteHost.host = this.options.proxy.ipaddress;
+                }
+                // Hostname
+            }
+            else if (addressType === constants_1.Socks5HostType.Hostname) {
+                const hostLength = header[4];
+                const dataNeeded = constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseHostname(hostLength); // header + host length + port
+                // Check if data is available.
+                if (this.receiveBuffer.length < dataNeeded) {
+                    this.nextRequiredPacketBufferSize = dataNeeded;
+                    return;
+                }
+                buff = smart_buffer_1.SmartBuffer.fromBuffer(this.receiveBuffer.get(dataNeeded).slice(5));
+                remoteHost = {
+                    host: buff.readString(hostLength),
+                    port: buff.readUInt16BE(),
+                };
+                // IPv6
+            }
+            else if (addressType === constants_1.Socks5HostType.IPv6) {
+                // Check if data is available.
+                const dataNeeded = constants_1.SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv6;
+                if (this.receiveBuffer.length < dataNeeded) {
+                    this.nextRequiredPacketBufferSize = dataNeeded;
+                    return;
+                }
+                buff = smart_buffer_1.SmartBuffer.fromBuffer(this.receiveBuffer.get(dataNeeded).slice(4));
+                remoteHost = {
+                    host: ip_address_1.Address6.fromByteArray(Array.from(buff.readBuffer(16))).canonicalForm(),
+                    port: buff.readUInt16BE(),
+                };
+            }
+            this.setState(constants_1.SocksClientState.Established);
+            this.removeInternalSocketHandlers();
+            this.emit('established', { remoteHost, socket: this.socket });
+        }
+    }
+    get socksClientOptions() {
+        return Object.assign({}, this.options);
+    }
+}
+exports.SocksClient = SocksClient;
+//# sourceMappingURL=socksclient.js.map

server/node_modules/socks/build/client/socksclient.js.map

@@ -0,0 +1 @@
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