Example #1
0
func writeSocks4Response(writer io.Writer, errCode byte, address v2net.Address, port v2net.Port) error {
	buffer := buf.NewLocal(32)
	buffer.AppendBytes(0x00, errCode)
	buffer.AppendSupplier(serial.WriteUint16(port.Value()))
	buffer.Append(address.IP())
	_, err := writer.Write(buffer.Bytes())
	return err
}
Example #2
0
func appendAddress(buffer *buf.Buffer, address v2net.Address, port v2net.Port) {
	switch address.Family() {
	case v2net.AddressFamilyIPv4:
		buffer.AppendBytes(0x01)
		buffer.Append(address.IP())
	case v2net.AddressFamilyIPv6:
		buffer.AppendBytes(0x04)
		buffer.Append(address.IP())
	case v2net.AddressFamilyDomain:
		buffer.AppendBytes(0x03, byte(len(address.Domain())))
		buffer.AppendSupplier(serial.WriteString(address.Domain()))
	}
	buffer.AppendSupplier(serial.WriteUint16(port.Value()))
}
Example #3
0
func (request *Socks5UDPRequest) Write(buffer *buf.Buffer) {
	buffer.AppendBytes(0, 0, request.Fragment)
	switch request.Address.Family() {
	case v2net.AddressFamilyIPv4:
		buffer.AppendBytes(AddrTypeIPv4)
		buffer.Append(request.Address.IP())
	case v2net.AddressFamilyIPv6:
		buffer.AppendBytes(AddrTypeIPv6)
		buffer.Append(request.Address.IP())
	case v2net.AddressFamilyDomain:
		buffer.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain())))
		buffer.Append([]byte(request.Address.Domain()))
	}
	buffer.AppendSupplier(serial.WriteUint16(request.Port.Value()))
	buffer.Append(request.Data.Bytes())
}
Example #4
0
func EncodeUDPPacket(request *protocol.RequestHeader, payload *buf.Buffer) (*buf.Buffer, error) {
	user := request.User
	rawAccount, err := user.GetTypedAccount()
	if err != nil {
		return nil, errors.Base(err).Message("Shadowsocks|UDP: Failed to parse account.")
	}
	account := rawAccount.(*ShadowsocksAccount)

	buffer := buf.NewSmall()
	ivLen := account.Cipher.IVSize()
	buffer.AppendSupplier(buf.ReadFullFrom(rand.Reader, ivLen))
	iv := buffer.Bytes()

	switch request.Address.Family() {
	case v2net.AddressFamilyIPv4:
		buffer.AppendBytes(AddrTypeIPv4)
		buffer.Append([]byte(request.Address.IP()))
	case v2net.AddressFamilyIPv6:
		buffer.AppendBytes(AddrTypeIPv6)
		buffer.Append([]byte(request.Address.IP()))
	case v2net.AddressFamilyDomain:
		buffer.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain())))
		buffer.Append([]byte(request.Address.Domain()))
	default:
		return nil, errors.New("Shadowsocks|UDP: Unsupported address type: ", request.Address.Family())
	}

	buffer.AppendSupplier(serial.WriteUint16(uint16(request.Port)))
	buffer.Append(payload.Bytes())

	if request.Option.Has(RequestOptionOneTimeAuth) {
		authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
		buffer.SetByte(ivLen, buffer.Byte(ivLen)|0x10)

		buffer.AppendSupplier(authenticator.Authenticate(buffer.BytesFrom(ivLen)))
	}

	stream, err := account.Cipher.NewEncodingStream(account.Key, iv)
	if err != nil {
		return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to create encoding stream.")
	}

	stream.XORKeyStream(buffer.BytesFrom(ivLen), buffer.BytesFrom(ivLen))
	return buffer, nil
}
Example #5
0
func WriteTCPRequest(request *protocol.RequestHeader, writer io.Writer) (buf.Writer, error) {
	user := request.User
	rawAccount, err := user.GetTypedAccount()
	if err != nil {
		return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to parse account.")
	}
	account := rawAccount.(*ShadowsocksAccount)

	iv := make([]byte, account.Cipher.IVSize())
	rand.Read(iv)
	_, err = writer.Write(iv)
	if err != nil {
		return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to write IV.")
	}

	stream, err := account.Cipher.NewEncodingStream(account.Key, iv)
	if err != nil {
		return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to create encoding stream.")
	}

	writer = crypto.NewCryptionWriter(stream, writer)

	header := buf.NewLocal(512)

	switch request.Address.Family() {
	case v2net.AddressFamilyIPv4:
		header.AppendBytes(AddrTypeIPv4)
		header.Append([]byte(request.Address.IP()))
	case v2net.AddressFamilyIPv6:
		header.AppendBytes(AddrTypeIPv6)
		header.Append([]byte(request.Address.IP()))
	case v2net.AddressFamilyDomain:
		header.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain())))
		header.Append([]byte(request.Address.Domain()))
	default:
		return nil, errors.New("Shadowsocks|TCP: Unsupported address type: ", request.Address.Family())
	}

	header.AppendSupplier(serial.WriteUint16(uint16(request.Port)))

	if request.Option.Has(RequestOptionOneTimeAuth) {
		header.SetByte(0, header.Byte(0)|0x10)

		authenticator := NewAuthenticator(HeaderKeyGenerator(account.Key, iv))
		header.AppendSupplier(authenticator.Authenticate(header.Bytes()))
	}

	_, err = writer.Write(header.Bytes())
	if err != nil {
		return nil, errors.Base(err).Message("Shadowsocks|TCP: Failed to write header.")
	}

	var chunkWriter buf.Writer
	if request.Option.Has(RequestOptionOneTimeAuth) {
		chunkWriter = NewChunkWriter(writer, NewAuthenticator(ChunkKeyGenerator(iv)))
	} else {
		chunkWriter = buf.NewWriter(writer)
	}

	return chunkWriter, nil
}