net.schmizz.sshj.transport

Interface Transport

All Superinterfaces:

SSHPacketHandler

All Known Implementing Classes:

TransportImpl

public interface Transport
extends SSHPacketHandler

Transport layer of the SSH protocol.

Method Summary

Methods

Modifier and Type	Method and Description
void	addHostKeyVerifier(HostKeyVerifier hkv) Adds the specified verifier.
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, String message) Send a disconnect packet with the given reason and message, and closes this transport.
void	doKex() Do key exchange and algorithm negotiation.
String	getClientVersion()
Config	getConfig()
DisconnectListener	getDisconnectListener()
int	getHeartbeatInterval()
String	getRemoteHost()
int	getRemotePort()
String	getServerVersion() Returns the version string as sent by the SSH server for identification purposes, e.g.
Service	getService()
byte[]	getSessionID()
int	getTimeout()
void	init(String host, int port, InputStream in, OutputStream out) Sets the host information and the streams to be used by this transport.
boolean	isAuthenticated()
boolean	isRunning()
void	join() Joins the thread calling this method to the transport's death.
void	join(int timeout, TimeUnit unit) Joins the thread calling this method to the transport's death.
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	setHeartbeatInterval(int interval)
void	setService(Service service) Sets the currently active Service.
void	setTimeout(int timeout) Set a timeout for methods that may block.
long	write(SSHPacket payload) Write a packet over this transport.

Methods inherited from interface net.schmizz.sshj.common.SSHPacketHandler

handle

Method Detail

init

void init(String host,
        int port,
        InputStream in,
        OutputStream out)
          throws TransportException

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.

Parameters:

host - server's hostname

port - 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

addHostKeyVerifier

void addHostKeyVerifier(HostKeyVerifier hkv)

Adds the specified verifier.

Parameters:

hkv - the host key verifier

doKex

void doKex()
           throws TransportException

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

Throws:

TransportException - if there was an error during key exchange

getClientVersion

String getClientVersion()

Returns:

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

getConfig

Config getConfig()

Returns:

the Config associated with this transport.

getTimeout

int getTimeout()

Returns:

the timeout that is currently set for blocking operations.

setTimeout

void setTimeout(int timeout)

Set a timeout for methods that may block.

Parameters:

timeout - the timeout in seconds

getHeartbeatInterval

int getHeartbeatInterval()

Returns:

the interval in seconds at which a heartbeat message is sent to the server

setHeartbeatInterval

void setHeartbeatInterval(int interval)

Parameters:

interval - the interval in seconds, 0 means no hearbeat

getRemoteHost

String getRemoteHost()

Returns:

the hostname to which this transport is connected.

getRemotePort

int getRemotePort()

Returns:

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

getServerVersion

String getServerVersion()

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 init(java.lang.String, int, java.io.InputStream, java.io.OutputStream), it will be null.

Returns:

server's version string (may be null)

getSessionID

byte[] getSessionID()

Returns:

the session identifier assigned by server

getService

Service getService()

Returns:

the currently active Service instance.

reqService

void reqService(Service service)
                throws TransportException

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

Parameters:

service - the SSH service to be requested

Throws:

TransportException - if the request failed for any reason

setService

void setService(Service service)

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 reqService(net.schmizz.sshj.Service) must have been successful (not necessarily for the service being set).

Parameters:

service - (null-ok) the Service

isAuthenticated

boolean isAuthenticated()

Returns:

whether the transport thinks it is authenticated.

setAuthenticated

void setAuthenticated()

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.

sendUnimplemented

long sendUnimplemented()
                       throws TransportException

Sends SSH_MSG_UNIMPLEMENTED in response to the last packet received.

Returns:

the sequence number of the packet sent

Throws:

TransportException - if an error occured sending the packet

isRunning

boolean isRunning()

Returns:

whether this transport is active.

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

join

void join()
          throws TransportException

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

Throws:

TransportException - if the transport dies of an exception

join

void join(int timeout,
        TimeUnit unit)
          throws TransportException

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

Throws:

TransportException - if the transport dies of an exception

disconnect

void disconnect()

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

disconnect

void disconnect(DisconnectReason reason)

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

Parameters:

reason - reason for disconnecting

disconnect

void disconnect(DisconnectReason reason,
              String message)

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

Parameters:

reason - the reason code for this disconnect

message - the text message

write

long write(SSHPacket payload)
           throws TransportException

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).

Parameters:

payload - the SSHPacket containing data to send

Returns:

sequence number of the sent packet

Throws:

TransportException - if an error occurred sending the packet

setDisconnectListener

void setDisconnectListener(DisconnectListener listener)

Specify a listener that will be notified upon disconnection.

Parameters:

listener -

getDisconnectListener

DisconnectListener getDisconnectListener()

Returns:

the current disconnect listener.