func()

in vncclient/client.go [360:414]

• 41 lines of code
• 12 McCabe index (conditional complexity)

func (c *ClientConn) securityHandshakeVersion8() error {
	var err error

	// Respond with the version we will support
	if _, err = c.c.Write([]byte("RFB 003.008\n")); err != nil {
		return err
	}

	// 7.1.2 Security Handshake from server
	var numSecurityTypes uint8
	if err = binary.Read(c.c, binary.BigEndian, &numSecurityTypes); err != nil {
		return err
	}

	if numSecurityTypes == 0 {
		return errors.Errorf("no security types: %s", c.readErrorReason())
	}

	securityTypes := make([]uint8, numSecurityTypes)
	if err = binary.Read(c.c, binary.BigEndian, &securityTypes); err != nil {
		return err
	}

	clientSecurityTypes := c.config.Auth
	if clientSecurityTypes == nil {
		clientSecurityTypes = []ClientAuth{new(ClientAuthNone)}
	}

	var auth ClientAuth
FindAuth:
	for _, curAuth := range clientSecurityTypes {
		for _, securityType := range securityTypes {
			if curAuth.SecurityType() == securityType {
				// We use the first matching supported authentication
				auth = curAuth
				break FindAuth
			}
		}
	}

	if auth == nil {
		return errors.Errorf("no suitable auth schemes found. server supported: %#v", securityTypes)
	}

	// Respond back with the security type we'll use
	if err = binary.Write(c.c, binary.BigEndian, auth.SecurityType()); err != nil {
		return err
	}

	if err = auth.Handshake(c.c); err != nil {
		return err
	}

	return nil
}