TypeScript SmartBuffer.fromBuffer方法代碼示例

  /**
   * Handles Socks v4 handshake response.
   * @param data
   */
  private handleSocks4FinalHandshakeResponse() {
    const data = this._receiveBuffer.get(8);

    if (data[1] !== Socks4Response.Granted) {
      this._closeSocket(
        `${ERRORS.Socks4ProxyRejectedConnection} - (${Socks4Response[data[1]]})`
      );
    } else {
      // Bind response
      if (SocksCommand[this._options.command] === SocksCommand.bind) {
        const buff = SmartBuffer.fromBuffer(data);
        buff.readOffset = 2;

        const remoteHost: SocksRemoteHost = {
          port: buff.readUInt16BE(),
          host: ip.fromLong(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.state = SocksClientState.BoundWaitingForConnection;
        this.emit('bound', { socket: this._socket, remoteHost });

        // Connect response
      } else {
        this.state = SocksClientState.Established;
        this.removeInternalSocketHandlers();
        this.emit('established', { socket: this._socket });
      }
    }
  }

  /**
   * Parses a SOCKS UDP frame.
   * @param data
   */
  static parseUDPFrame(data: Buffer): SocksUDPFrameDetails {
    const buff = SmartBuffer.fromBuffer(data);
    buff.readOffset = 2;

    const frameNumber = buff.readUInt8();
    const hostType: Socks5HostType = buff.readUInt8();
    let remoteHost;

    if (hostType === Socks5HostType.IPv4) {
      remoteHost = ip.fromLong(buff.readUInt32BE());
    } else if (hostType === Socks5HostType.IPv6) {
      remoteHost = ip.toString(buff.readBuffer(16));
    } else {
      remoteHost = buff.readString(buff.readUInt8());
    }

    const remotePort = buff.readUInt16BE();

    return {
      frameNumber,
      remoteHost: {
        host: remoteHost,
        port: remotePort
      },
      data: buff.readBuffer()
    };
  }

  /**
   * Handles Socks v4 incoming connection request (BIND)
   * @param data
   */
  private handleSocks4IncomingConnectionResponse() {
    const data = this._receiveBuffer.get(8);

    if (data[1] !== Socks4Response.Granted) {
      this._closeSocket(
        `${ERRORS.Socks4ProxyRejectedIncomingBoundConnection} - (${
          Socks4Response[data[1]]
        })`
      );
    } else {
      const buff = SmartBuffer.fromBuffer(data);
      buff.readOffset = 2;

      const remoteHost: SocksRemoteHost = {
        port: buff.readUInt16BE(),
        host: ip.fromLong(buff.readUInt32BE())
      };

      this.state = SocksClientState.Established;
      this.removeInternalSocketHandlers();
      this.emit('established', { socket: this._socket, remoteHost });
    }
  }

  /**
   * Handles Socks v5 incoming connection request (BIND).
   */
  private 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] !== Socks5Response.Granted) {
      this._closeSocket(
        `${ERRORS.Socks5ProxyRejectedIncomingBoundConnection} - ${
          Socks5Response[header[1]]
        }`
      );
    } else {
      // Read address type
      const addressType = header[3];

      let remoteHost: SocksRemoteHost;
      let buff: SmartBuffer;

      // IPv4
      if (addressType === Socks5HostType.IPv4) {
        // Check if data is available.
        const dataNeeded = SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv4;
        if (this._receiveBuffer.length < dataNeeded) {
          this._nextRequiredPacketBufferSize = dataNeeded;
          return;
        }

        buff = SmartBuffer.fromBuffer(
          this._receiveBuffer.get(dataNeeded).slice(4)
        );

        remoteHost = {
          host: ip.fromLong(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 === Socks5HostType.Hostname) {
        const hostLength = header[4];
        const dataNeeded = 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 = SmartBuffer.fromBuffer(
          this._receiveBuffer.get(dataNeeded).slice(5) // Slice at 5 to skip host length
        );

        remoteHost = {
          host: buff.readString(hostLength),
          port: buff.readUInt16BE()
        };
        // IPv6
      } else if (addressType === Socks5HostType.IPv6) {
        // Check if data is available.
        const dataNeeded = SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv6;
        if (this._receiveBuffer.length < dataNeeded) {
          this._nextRequiredPacketBufferSize = dataNeeded;
          return;
        }

        buff = SmartBuffer.fromBuffer(
          this._receiveBuffer.get(dataNeeded).slice(4)
        );

        remoteHost = {
          host: ip.toString(buff.readBuffer(16)),
          port: buff.readUInt16BE()
        };
      }

      this.state = SocksClientState.Established;
      this.removeInternalSocketHandlers();
      this.emit('established', { socket: this._socket, remoteHost });
    }
  }

  /**
   * Handles Socks v5 final handshake response.
   * @param data
   */
  private 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] !== Socks5Response.Granted) {
      this._closeSocket(
        `${ERRORS.InvalidSocks5FinalHandshakeRejected} - ${
          Socks5Response[header[1]]
        }`
      );
    } else {
      // Read address type
      const addressType = header[3];

      let remoteHost: SocksRemoteHost;
      let buff: SmartBuffer;

      // IPv4
      if (addressType === Socks5HostType.IPv4) {
        // Check if data is available.
        const dataNeeded = SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv4;
        if (this._receiveBuffer.length < dataNeeded) {
          this._nextRequiredPacketBufferSize = dataNeeded;
          return;
        }

        buff = SmartBuffer.fromBuffer(
          this._receiveBuffer.get(dataNeeded).slice(4)
        );

        remoteHost = {
          host: ip.fromLong(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 === Socks5HostType.Hostname) {
        const hostLength = header[4];
        const dataNeeded = 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 = SmartBuffer.fromBuffer(
          this._receiveBuffer.get(dataNeeded).slice(5) // Slice at 5 to skip host length
        );

        remoteHost = {
          host: buff.readString(hostLength),
          port: buff.readUInt16BE()
        };
        // IPv6
      } else if (addressType === Socks5HostType.IPv6) {
        // Check if data is available.
        const dataNeeded = SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseIPv6;
        if (this._receiveBuffer.length < dataNeeded) {
          this._nextRequiredPacketBufferSize = dataNeeded;
          return;
        }

        buff = SmartBuffer.fromBuffer(
          this._receiveBuffer.get(dataNeeded).slice(4)
        );

        remoteHost = {
          host: ip.toString(buff.readBuffer(16)),
          port: buff.readUInt16BE()
        };
      }

      // We have everything we need
      this.state = SocksClientState.ReceivedFinalResponse;

      // If using CONNECT, the client is now in the established state.
      if (SocksCommand[this._options.command] === SocksCommand.connect) {
        this.state = SocksClientState.Established;
        this.removeInternalSocketHandlers();
        this.emit('established', { socket: this._socket });
      } else if (SocksCommand[this._options.command] === 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.state = SocksClientState.BoundWaitingForConnection;
        this._nextRequiredPacketBufferSize =
          SOCKS_INCOMING_PACKET_SIZES.Socks5ResponseHeader;
        this.emit('bound', { socket: this._socket, remoteHost });
        /*
//.........這裏部分代碼省略.........