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/*
* Copyright 2001-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.net.bsd;
import java.io.IOException;
/***
* RLoginClient is very similar to
* RCommandClient ,
* from which it is derived, and uses the rcmd() facility implemented
* in RCommandClient to implement the functionality of the rlogin command that
* first appeared in 4.2BSD Unix. rlogin is a command used to login to
* a remote machine from a trusted host, sometimes without issuing a
* password. The trust relationship is the same as described in
* the documentation for
* RCommandClient .
*
* As with virtually all of the client classes in org.apache.commons.net, this
* class derives from SocketClient. But it relies on the connection
* methods defined in RcommandClient which ensure that the local Socket
* will originate from an acceptable rshell port. The way to use
* RLoginClient is to first connect
* to the server, call the rlogin() method,
* and then
* fetch the connection's input and output streams.
* Interaction with the remote command is controlled entirely through the
* I/O streams. Once you have finished processing the streams, you should
* invoke
* disconnect() to clean up properly.
*
* The standard output and standard error streams of the
* remote process are transmitted over the same connection, readable
* from the input stream returned by
*
* getInputStream() . Unlike RExecClient and RCommandClient, it is
* not possible to tell the rlogind daemon to return the standard error
* stream over a separate connection.
*
* getErrorStream() will always return null.
* The standard input of the remote process can be written to through
* the output stream returned by
*
* getOutputSream() .
*
*
* @author Daniel F. Savarese
* @see org.apache.commons.net.SocketClient
* @see RExecClient
* @see RCommandClient
***/
public class RLoginClient extends RCommandClient
{
/***
* The default rlogin port. Set to 513 in BSD Unix and according
* to RFC 1282.
***/
public static final int DEFAULT_PORT = 513;
/***
* The default RLoginClient constructor. Initializes the
* default port to DEFAULT_PORT .
***/
public RLoginClient()
{
setDefaultPort(DEFAULT_PORT);
}
/***
* Logins into a remote machine through the rlogind daemon on the server
* to which the RLoginClient is connected. After calling this method,
* you may interact with the remote login shell through its standard input
* and output streams. Standard error is sent over the same stream as
* standard output. You will typically be able to detect
* the termination of the remote login shell after reaching end of file
* on its standard output (accessible through
* getInputStream() . Disconnecting
* from the server or closing the process streams before reaching
* end of file will terminate the remote login shell in most cases.
*
* If user authentication fails, the rlogind daemon will request that
* a password be entered interactively. You will be able to read the
* prompt from the output stream of the RLoginClient and write the
* password to the input stream of the RLoginClient.
*
* @param localUsername The user account on the local machine that is
* trying to login to the remote host.
* @param remoteUsername The account name on the server that is
* being logged in to.
* @param terminalType The name of the user's terminal (e.g., "vt100",
* "network", etc.)
* @param terminalSpeed The speed of the user's terminal, expressed
* as a baud rate or bps (e.g., 9600 or 38400)
* @exception IOException If the rlogin() attempt fails. The exception
* will contain a message indicating the nature of the failure.
***/
public void rlogin(String localUsername, String remoteUsername,
String terminalType, int terminalSpeed)
throws IOException
{
rexec(localUsername, remoteUsername, terminalType + "/" + terminalSpeed,
false);
}
/***
* Same as the other rlogin method, but no terminal speed is defined.
***/
public void rlogin(String localUsername, String remoteUsername,
String terminalType)
throws IOException
{
rexec(localUsername, remoteUsername, terminalType, false);
}
}
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