Package net.schmizz.sshj.transport

Class TransportImpl

java.lang.Object

net.schmizz.sshj.transport.TransportImpl

All Implemented Interfaces:

RemoteAddressProvider, SSHPacketHandler, DisconnectListener, Transport

public final class TransportImpl
extends java.lang.Object
implements Transport, DisconnectListener

A thread-safe Transport implementation.

Constructor Summary

Constructors

Constructor	Description
TransportImpl(Config config)

Method Summary

Modifier and Type	Method	Description
void	addAlgorithmsVerifier(AlgorithmsVerifier verifier)	Adds the specified verifier.
void	addHostKeyVerifier(HostKeyVerifier hkv)	Adds the specified verifier.
void	die(java.lang.Exception ex)	Kill the transport in an exceptional way.
void	disconnect()	Send a disconnection packet with reason as DisconnectReason.BY_APPLICATION, and closes this transport.
void	disconnect(DisconnectReason reason)	Send a disconnect packet with the given reason, and closes this transport.
void	disconnect(DisconnectReason reason, java.lang.String message)	Send a disconnect packet with the given reason and message, and closes this transport.
void	doKex()	Do key exchange and algorithm negotiation.
java.util.List<KeyAlgorithm>	getClientKeyAlgorithms(KeyType keyType)
java.lang.String	getClientVersion()
Config	getConfig()
DisconnectListener	getDisconnectListener()
KeyAlgorithm	getHostKeyAlgorithm()
java.lang.String	getRemoteHost()
int	getRemotePort()
java.net.InetSocketAddress	getRemoteSocketAddress()	Get Remote Socket Address using Connection Information
java.lang.String	getServerVersion()	Returns the version string as sent by the SSH server for identification purposes, e.g.
Service	getService()
byte[]	getSessionID()
int	getTimeoutMs()
void	handle(Message msg, SSHPacket buf)	This is where all incoming packets are handled.
void	init(java.lang.String remoteHost, int remotePort, java.io.InputStream in, java.io.OutputStream out)	Sets the host information and the streams to be used by this transport.
boolean	isAuthenticated()
boolean	isKexDone()
boolean	isKeyExchangeRequired()	Is Key Exchange required returns true when Key Exchange is not done and when Key Exchange is not ongoing
boolean	isRunning()
void	join()	Joins the thread calling this method to the transport's death.
void	join(int timeout, java.util.concurrent.TimeUnit unit)	Joins the thread calling this method to the transport's death.
void	notifyDisconnect(DisconnectReason reason, java.lang.String message)	TransportImpl implements its own default DisconnectListener.
void	reqService(Service service)	Request a SSH service represented by a Service instance.
long	sendUnimplemented()	Sends SSH_MSG_UNIMPLEMENTED in response to the last packet received.
void	setAuthenticated()	Informs this transport that authentication has been completed.
void	setDisconnectListener(DisconnectListener listener)	Specify a listener that will be notified upon disconnection.
void	setHostKeyAlgorithm(KeyAlgorithm keyAlgorithm)
void	setService(Service service)	Sets the currently active Service.
void	setTimeoutMs(int timeoutMs)	Set a timeout for methods that may block.
long	write(SSHPacket payload)	Write a packet over this transport.

Methods inherited from class java.lang.Object

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

Constructor Detail

TransportImpl

public TransportImpl(Config config)

Method Detail

init

public void init(java.lang.String remoteHost,
                 int remotePort,
                 java.io.InputStream in,
                 java.io.OutputStream out)
          throws TransportException

Description copied from interface: Transport

Sets the host information and the streams to be used by this transport. Identification information is exchanged with the server. A TransportException is thrown in case of SSH protocol version incompatibility.

Specified by:

init in interface Transport

Parameters:

remoteHost - server's hostname

remotePort - server's port

in - input stream for the connection

out - output stream for the connection

Throws:

TransportException - if there is an error during exchange of identification information

getRemoteSocketAddress

public java.net.InetSocketAddress getRemoteSocketAddress()

Get Remote Socket Address using Connection Information

Specified by:

getRemoteSocketAddress in interface RemoteAddressProvider

Returns:

Remote Socket Address or null when not connected

notifyDisconnect

public void notifyDisconnect(DisconnectReason reason,
                             java.lang.String message)

TransportImpl implements its own default DisconnectListener.

Specified by:

notifyDisconnect in interface DisconnectListener

addHostKeyVerifier

public void addHostKeyVerifier(HostKeyVerifier hkv)

Description copied from interface: Transport

Adds the specified verifier.

Specified by:

addHostKeyVerifier in interface Transport

Parameters:

hkv - the host key verifier

addAlgorithmsVerifier

public void addAlgorithmsVerifier(AlgorithmsVerifier verifier)

Description copied from interface: Transport

Adds the specified verifier.

Specified by:

addAlgorithmsVerifier in interface Transport

Parameters:

verifier - The verifier to call with negotiated algorithms

doKex

public void doKex()
           throws TransportException

Description copied from interface: Transport

Do key exchange and algorithm negotiation. This can be the initial one or for algorithm renegotiation.

Specified by:

doKex in interface Transport

Throws:

TransportException - if there was an error during key exchange

isKeyExchangeRequired

public boolean isKeyExchangeRequired()

Is Key Exchange required returns true when Key Exchange is not done and when Key Exchange is not ongoing

Specified by:

isKeyExchangeRequired in interface Transport

Returns:

Key Exchange required status

isKexDone

public boolean isKexDone()

getTimeoutMs

public int getTimeoutMs()

Specified by:

getTimeoutMs in interface Transport

Returns:

the timeout that is currently set for blocking operations.

setTimeoutMs

public void setTimeoutMs(int timeoutMs)

Description copied from interface: Transport

Set a timeout for methods that may block.

Specified by:

setTimeoutMs in interface Transport

Parameters:

timeoutMs - the timeout in milliseconds

getRemoteHost

public java.lang.String getRemoteHost()

Specified by:

getRemoteHost in interface Transport

Returns:

the hostname to which this transport is connected.

getRemotePort

public int getRemotePort()

Specified by:

getRemotePort in interface Transport

Returns:

the port number on the remote host to which this transport is connected.

getClientVersion

public java.lang.String getClientVersion()

Specified by:

getClientVersion in interface Transport

Returns:

the version string used by this client to identify itself to an SSH server, e.g. "SSHJ_3_0"

getConfig

public Config getConfig()

Specified by:

getConfig in interface Transport

Returns:

the Config associated with this transport.

getServerVersion

public java.lang.String getServerVersion()

Description copied from interface: Transport

Returns the version string as sent by the SSH server for identification purposes, e.g. "OpenSSH_$version".

If the transport has not yet been initialized via Transport.init(java.lang.String, int, java.io.InputStream, java.io.OutputStream), it will be null.

Specified by:

getServerVersion in interface Transport

Returns:

server's version string (may be null)

getSessionID

public byte[] getSessionID()

Specified by:

getSessionID in interface Transport

Returns:

the session identifier assigned by server

getService

public Service getService()

Specified by:

getService in interface Transport

Returns:

the currently active Service instance.

setService

public void setService(Service service)

Description copied from interface: Transport

Sets the currently active Service. Handling of non-transport-layer packets is delegated to that service.

For this method to be successful, at least one service request via Transport.reqService(net.schmizz.sshj.Service) must have been successful (not necessarily for the service being set).

Specified by:

setService in interface Transport

Parameters:

service - (null-ok) the Service

reqService

public void reqService(Service service)
                throws TransportException

Description copied from interface: Transport

Request a SSH service represented by a Service instance. A separate call to Transport.setService(net.schmizz.sshj.Service) is not needed.

Specified by:

reqService in interface Transport

Parameters:

service - the SSH service to be requested

Throws:

TransportException - if the request failed for any reason

setAuthenticated

public void setAuthenticated()

Description copied from interface: Transport

Informs this transport that authentication has been completed. This method must be called after successful authentication, so that delayed compression may become effective if applicable.

Specified by:

setAuthenticated in interface Transport

isAuthenticated

public boolean isAuthenticated()

Specified by:

isAuthenticated in interface Transport

Returns:

whether the transport thinks it is authenticated.

sendUnimplemented

public long sendUnimplemented()
                       throws TransportException

Description copied from interface: Transport

Sends SSH_MSG_UNIMPLEMENTED in response to the last packet received.

Specified by:

sendUnimplemented in interface Transport

Returns:

the sequence number of the packet sent

Throws:

TransportException - if an error occurred sending the packet

join

public void join()
          throws TransportException

Description copied from interface: Transport

Joins the thread calling this method to the transport's death.

Specified by:

join in interface Transport

Throws:

TransportException - if the transport dies of an exception

join

public void join(int timeout,
                 java.util.concurrent.TimeUnit unit)
          throws TransportException

Description copied from interface: Transport

Joins the thread calling this method to the transport's death.

Specified by:

join in interface Transport

Throws:

TransportException - if the transport dies of an exception

isRunning

public boolean isRunning()

Specified by:

isRunning in interface Transport

Returns:

whether this transport is active.

The transport is considered to be running if it has been initialized without error via Transport.init(java.lang.String, int, java.io.InputStream, java.io.OutputStream) and has not been disconnected.

disconnect

public void disconnect()

Description copied from interface: Transport

Send a disconnection packet with reason as DisconnectReason.BY_APPLICATION, and closes this transport.

Specified by:

disconnect in interface Transport

disconnect

public void disconnect(DisconnectReason reason)

Description copied from interface: Transport

Send a disconnect packet with the given reason, and closes this transport.

Specified by:

disconnect in interface Transport

Parameters:

reason - reason for disconnecting

disconnect

public void disconnect(DisconnectReason reason,
                       java.lang.String message)

Description copied from interface: Transport

Send a disconnect packet with the given reason and message, and closes this transport.

Specified by:

disconnect in interface Transport

Parameters:

reason - the reason code for this disconnect

message - the text message

setDisconnectListener

public void setDisconnectListener(DisconnectListener listener)

Description copied from interface: Transport

Specify a listener that will be notified upon disconnection.

Specified by:

setDisconnectListener in interface Transport

Parameters:

listener - Disconnect Listener to be configured

getDisconnectListener

public DisconnectListener getDisconnectListener()

Specified by:

getDisconnectListener in interface Transport

Returns:

the current disconnect listener.

write

public long write(SSHPacket payload)
           throws TransportException

Description copied from interface: Transport

Write a packet over this transport.

The payload SSHPacket should have 5 bytes free at the beginning to avoid a performance penalty associated with making space for header bytes (packet length, padding length).

Specified by:

write in interface Transport

Parameters:

payload - the SSHPacket containing data to send

Returns:

sequence number of the sent packet

Throws:

TransportException - if an error occurred sending the packet

handle

public void handle(Message msg,
                   SSHPacket buf)
            throws SSHException

This is where all incoming packets are handled. If they pertain to the transport layer, they are handled here; otherwise they are delegated to the active service instance if any via SSHPacketHandler.handle(net.schmizz.sshj.common.Message, net.schmizz.sshj.common.SSHPacket).

Even among the transport layer specific packets, key exchange packets are delegated to SSHPacketHandler.handle(net.schmizz.sshj.common.Message, net.schmizz.sshj.common.SSHPacket).

This method is called in the context of the reader thread via Decoder.received(byte[], int) when a full packet has been decoded.

Specified by:

handle in interface SSHPacketHandler

Parameters:

msg - the message identifier

buf - buffer containing rest of the packet

Throws:

SSHException - if an error occurs during handling (unrecoverable)

die

public void die(java.lang.Exception ex)

Description copied from interface: Transport

Kill the transport in an exceptional way.

Specified by:

die in interface Transport

Parameters:

ex - The exception that occurred.

setHostKeyAlgorithm

public void setHostKeyAlgorithm(KeyAlgorithm keyAlgorithm)

getHostKeyAlgorithm

public KeyAlgorithm getHostKeyAlgorithm()

Specified by:

getHostKeyAlgorithm in interface Transport

getClientKeyAlgorithms

public java.util.List<KeyAlgorithm> getClientKeyAlgorithms(KeyType keyType)
                                                    throws TransportException

Specified by:

getClientKeyAlgorithms in interface Transport

Throws:

TransportException