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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

 * 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, 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 * @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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