Package org.drasyl.util.protocol

Class NatPmpUtil

java.lang.Object

org.drasyl.util.protocol.NatPmpUtil

public final class NatPmpUtil
extends Object

Utility class for NAT Port Mapping Protocol (NAT-PMP)-related stuff.

See Also:

• RFC 6886

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NatPmpUtil.ExternalAddressResponseMessage
static class	NatPmpUtil.MappingUdpResponseMessage
static interface	NatPmpUtil.Message
static enum	NatPmpUtil.ResultCode

Field Summary

Fields

Modifier and Type	Field	Description
static final int	EXTERNAL_ADDRESS_REQUEST_OP
static final int	EXTERNAL_ADDRESS_RESPONSE_OP
static final int	LIFETIME_LENGTH
static final int	MAPPING_TCP_REQUEST_OP
static final int	MAPPING_TCP_RESPONSE_OP
static final int	MAPPING_UDP_REQUEST_OP
static final int	MAPPING_UDP_RESPONSE_OP
static final int	NAT_PMP_PORT
static final int	NAT_PMP_VERSION
static final int	RESERVED_LENGTH

Method Summary

Modifier and Type	Method	Description
static byte[]	buildExternalAddressRequestMessage()	To determine the external address, the client behind the NAT sends the following UDP payload to port 5351 of the configured gateway address: 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vers = 0 | OP = 0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
static byte[]	buildMappingRequestMessage(int internalPort, int externalPort, Duration lifetime)	To create a mapping, the client sends a UDP packet to port 5351 of the gateway's internal IP address with the following format: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Vers = 0 | OP = x | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Internal Port | Suggested External Port | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Requested Port Mapping Lifetime in Seconds | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Opcodes supported: 1 - Map UDP 2 - Map TCP The Reserved field MUST be set to zero on transmission and MUST be ignored on reception.
static NatPmpUtil.Message	readMessage(InputStream inputStream)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

NAT_PMP_PORT

public static final int NAT_PMP_PORT

See Also:

• Constant Field Values

NAT_PMP_VERSION

public static final int NAT_PMP_VERSION

See Also:

• Constant Field Values

EXTERNAL_ADDRESS_REQUEST_OP

public static final int EXTERNAL_ADDRESS_REQUEST_OP

See Also:

• Constant Field Values

EXTERNAL_ADDRESS_RESPONSE_OP

public static final int EXTERNAL_ADDRESS_RESPONSE_OP

See Also:

• Constant Field Values

MAPPING_UDP_REQUEST_OP

public static final int MAPPING_UDP_REQUEST_OP

See Also:

• Constant Field Values

MAPPING_UDP_RESPONSE_OP

public static final int MAPPING_UDP_RESPONSE_OP

See Also:

• Constant Field Values

MAPPING_TCP_REQUEST_OP

public static final int MAPPING_TCP_REQUEST_OP

See Also:

• Constant Field Values

MAPPING_TCP_RESPONSE_OP

public static final int MAPPING_TCP_RESPONSE_OP

See Also:

• Constant Field Values

RESERVED_LENGTH

public static final int RESERVED_LENGTH

See Also:

• Constant Field Values

LIFETIME_LENGTH

public static final int LIFETIME_LENGTH

See Also:

• Constant Field Values

Method Details

buildExternalAddressRequestMessage

public static byte[] buildExternalAddressRequestMessage()

    To determine the external address, the client behind the NAT sends
    the following UDP payload to port 5351 of the configured gateway
    address:

     0                   1
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Vers = 0      | OP = 0        |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 

buildMappingRequestMessage

public static byte[] buildMappingRequestMessage(int internalPort,
 int externalPort,
 Duration lifetime)

    To create a mapping, the client sends a UDP packet to port 5351 of
    the gateway's internal IP address with the following format:

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Vers = 0      | OP = x        | Reserved                      |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Internal Port                 | Suggested External Port       |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Requested Port Mapping Lifetime in Seconds                    |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Opcodes supported:
    1 - Map UDP
    2 - Map TCP

    The Reserved field MUST be set to zero on transmission and MUST be
    ignored on reception.

    The Ports and Lifetime are transmitted in the traditional network
    byte order (i.e., most significant byte first).

    The Internal Port is set to the local port on which the client is
    listening.
 

Throws:

IllegalArgumentException - if internalPort or externalPort is not in range of [0, 2^16 - 1]

readMessage

public static NatPmpUtil.Message readMessage(InputStream inputStream)
                                      throws IOException

Throws:

IOException