net.i2p.router.transport.udp

Class SSU2Payload

java.lang.Object

net.i2p.router.transport.udp.SSU2Payload

class SSU2Payload
extends Object

SSU2 Payload generation and parsing utilities.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SSU2Payload.AckBlock Block containing acknowledgment data.
static class	SSU2Payload.AddressBlock Block containing IP address and port information.
static class	SSU2Payload.Block Base class for blocks to be transmitted.
static class	SSU2Payload.DateTimeBlock Block containing the current date and time.
static class	SSU2Payload.FirstFragBlock Same format as I2NPBlock
static class	SSU2Payload.FollowFragBlock Follow-on fragment block for SSU2 payload.
static class	SSU2Payload.I2NPBlock Block containing I2NP message data.
static class	SSU2Payload.NewTokenBlock Block containing a new session token.
static class	SSU2Payload.OptionsBlock Block containing session options.
static class	SSU2Payload.PaddingBlock Block containing padding data.
static class	SSU2Payload.PathChallengeBlock Path challenge block for SSU2 payload.
static class	SSU2Payload.PathResponseBlock Path response block for SSU2 payload.
static interface	SSU2Payload.PayloadCallback For all callbacks, recommend throwing exceptions only from the handshake.
static class	SSU2Payload.PeerTestBlock Block containing peer test data.
static class	SSU2Payload.RelayIntroBlock Block containing relay introduction data.
static class	SSU2Payload.RelayRequestBlock Block containing relay request data.
static class	SSU2Payload.RelayResponseBlock Block containing relay response data.
static class	SSU2Payload.RelayTagBlock Block containing relay tag data.
static class	SSU2Payload.RelayTagRequestBlock Block containing relay tag request data.
static class	SSU2Payload.RIBlock Block containing router information data.
static class	SSU2Payload.TerminationBlock Block containing session termination data.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BLOCK_HEADER_SIZE
static int	BLOCK_TERMINATION

Constructor Summary

Constructors

Constructor and Description
SSU2Payload()

Method Summary

Modifier and Type	Method and Description
static int	processPayload(I2PAppContext ctx, SSU2Payload.PayloadCallback cb, byte[] payload, int off, int length, boolean isHandshake, RemoteHostId from) Incoming payload.
static int	writePayload(byte[] payload, int off, List<SSU2Payload.Block> blocks)

Methods inherited from class java.lang.Object

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

Field Detail

BLOCK_HEADER_SIZE

public static final int BLOCK_HEADER_SIZE

See Also:

Constant Field Values

BLOCK_TERMINATION

public static final int BLOCK_TERMINATION

See Also:

Constant Field Values

Constructor Detail

SSU2Payload

SSU2Payload()

Method Detail

processPayload

public static int processPayload(I2PAppContext ctx,
                                 SSU2Payload.PayloadCallback cb,
                                 byte[] payload,
                                 int off,
                                 int length,
                                 boolean isHandshake,
                                 RemoteHostId from)
                          throws IOException,
                                 DataFormatException,
                                 I2NPMessageException

Incoming payload. Calls the callback for each received block.

Parameters:

isHandshake - true for Token Req, Retry, Sess Req, Sess Created; false for Sess Confirmed

from - for path challenge/response only, may be null

Returns:

number of blocks processed

Throws:

IOException - on major errors

DataFormatException - on parsing of individual blocks

I2NPMessageException - on parsing of I2NP block

writePayload

public static int writePayload(byte[] payload,
                               int off,
                               List<SSU2Payload.Block> blocks)

Parameters:

payload - writes to it starting at off

Returns:

the new offset