anon.anonudp.client

Class AnonPureUDPChannel

java.lang.Object

anon.client.AbstractAnonUDPChannel

anon.anonudp.client.AnonPureUDPChannel

All Implemented Interfaces:

AnonChannel, IAnonUDPChannel

public class AnonPureUDPChannel
extends AbstractAnonUDPChannel

Field Summary

Fields inherited from interface anon.AnonChannel

HTTP, SMTP, SOCKS, TCP, UDP, UDP_OVER_TCP, UDP_OVER_UDP, VPN

Constructor Summary

Constructors

Constructor and Description
AnonPureUDPChannel(UDPMultiplexer multiplexer)

Method Summary

Modifier and Type	Method and Description
void	close() Closes the channel and releases all resources used.
int	getOutputBlockSize() Returns a value that indicates the current optimum size of data to write.
boolean	isClosed() Returns if the channel is already closed, i.e. no data can be sent / recieved any more on this channel.
int	readPacket(byte[] payload, int off, int len) Reads the payload of a whole UDP packet sent from the peer.
void	setDestination(java.lang.String host, int port)
void	writePacket(byte[] payload)
void	writePacket(byte[] payload, int offset, int length)

Methods inherited from class anon.client.AbstractAnonUDPChannel

getInputStream, getOutputStream, setSentAutoFlushDelay, setSourcePort

Methods inherited from class java.lang.Object

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

Constructor Detail

AnonPureUDPChannel

public AnonPureUDPChannel(UDPMultiplexer multiplexer)

Method Detail

setDestination

public void setDestination(java.lang.String host,
                           int port)

Specified by:

setDestination in interface IAnonUDPChannel

Overrides:

setDestination in class AbstractAnonUDPChannel

Parameters:

host - the domain name of the target host

port - the target port number

writePacket

public void writePacket(byte[] payload,
                        int offset,
                        int length)
                 throws java.io.IOException

Throws:

java.io.IOException

writePacket

public void writePacket(byte[] payload)
                 throws java.io.IOException

Specified by:

writePacket in interface IAnonUDPChannel

Overrides:

writePacket in class AbstractAnonUDPChannel

Throws:

java.io.IOException

readPacket

public int readPacket(byte[] payload,
                      int off,
                      int len)
               throws java.io.IOException,
                      UDPPacketStreamDesynchronisationException,
                      UDPPacketToLargeException

Description copied from interface: IAnonUDPChannel

Reads the payload of a whole UDP packet sent from the peer. If the provided buffer is too small a UDPPacketToLargeException is thrown. Note: Do not mix calls to getInputStream.read() and readPacket() -- otherwise the UDP packet stream might get out of sync leading to a UDPPacketStreamDesynchronisationException.

Returns:

number of payload bytes read

Throws:

java.io.IOException

UDPPacketStreamDesynchronisationException

UDPPacketToLargeException

getOutputBlockSize

public int getOutputBlockSize()

Description copied from interface: AnonChannel

Returns a value that indicates the current optimum size of data to write. Because often anon services transport the data fragmented into fixed sized packets for optimum performance it may be good to send data according to the packet size to avoid unneccessary overheads.

Returns:

the current optimum size for output data. If 1 is returned the size does not matter.

close

public void close()

Description copied from interface: AnonChannel

Closes the channel and releases all resources used.

isClosed

public boolean isClosed()

Description copied from interface: AnonChannel

Returns if the channel is already closed, i.e. no data can be sent / recieved any more on this channel.

Returns:

true, if the channel is already closed