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<div class="subTitle">org.apache.commons.net.bsd</div>
<h2 title="Class RCommandClient" class="title">Class RCommandClient</h2>
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<li><a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">org.apache.commons.net.SocketClient</a></li>
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<li><a href="../../../../../org/apache/commons/net/bsd/RExecClient.html" title="class in org.apache.commons.net.bsd">org.apache.commons.net.bsd.RExecClient</a></li>
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<ul class="inheritance">
<li>org.apache.commons.net.bsd.RCommandClient</li>
</ul>
</li>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../org/apache/commons/net/bsd/RLoginClient.html" title="class in org.apache.commons.net.bsd">RLoginClient</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">RCommandClient</span>
extends <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html" title="class in org.apache.commons.net.bsd">RExecClient</a></pre>
<div class="block">RCommandClient is very similar to
<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html" title="class in org.apache.commons.net.bsd"><code>RExecClient</code></a>,
from which it is derived, and implements the rcmd() facility that
first appeared in 4.2BSD Unix. rcmd() is the facility used by the rsh
(rshell) and other commands to execute a command on another machine
from a trusted host without issuing a password. The trust relationship
between two machines is established by the contents of a machine's
/etc/hosts.equiv file and a user's .rhosts file. These files specify
from which hosts and accounts on those hosts rcmd() requests will be
accepted. The only additional measure for establishing trust is that
all client connections must originate from a port between 512 and 1023.
Consequently, there is an upper limit to the number of rcmd connections
that can be running simultaneously. The required ports are reserved
ports on Unix systems, and can only be bound by a
process running with root permissions (to accomplish this rsh, rlogin,
and related commands usualy have the suid bit set). Therefore, on a
Unix system, you will only be able to successfully use the RCommandClient
class if the process runs as root. However, there is no such restriction
on Windows95 and some other systems. The security risks are obvious.
However, when carefully used, rcmd() can be very useful when used behind
a firewall.
<p>
As with virtually all of the client classes in org.apache.commons.net, this
class derives from SocketClient. But it overrides most of its connection
methods so that the local Socket will originate from an acceptable
rshell port. The way to use RCommandClient is to first connect
to the server, call the <a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#rcommand(java.lang.String, java.lang.String, java.lang.String, boolean)"><code>rcommand() </code></a> method,
and then
fetch the connection's input, output, and optionally error streams.
Interaction with the remote command is controlled entirely through the
I/O streams. Once you have finished processing the streams, you should
invoke <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#disconnect()"><code>disconnect() </code></a>
to clean up properly.
<p>
By default the standard output and standard error streams of the
remote process are transmitted over the same connection, readable
from the input stream returned by
<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getInputStream()"><code>getInputStream() </code></a>
. However, it is
possible to tell the rshd daemon to return the standard error
stream over a separate connection, readable from the input stream
returned by <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getErrorStream()"><code>getErrorStream() </code></a>
. You
can specify that a separate connection should be created for standard
error by setting the boolean <code> separateErrorStream </code>
parameter of <a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#rcommand(java.lang.String, java.lang.String, java.lang.String, boolean)"><code>rcommand() </code></a> to <code> true </code>.
The standard input of the remote process can be written to through
the output stream returned by
<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getOutputStream()"><code>getOutputStream() </code></a>
.
<p>
<p></div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Daniel F. Savarese</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net"><code>SocketClient</code></a>,
<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html" title="class in org.apache.commons.net.bsd"><code>RExecClient</code></a>,
<a href="../../../../../org/apache/commons/net/bsd/RLoginClient.html" title="class in org.apache.commons.net.bsd"><code>RLoginClient</code></a></dd></dl>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#DEFAULT_PORT">DEFAULT_PORT</a></strong></code>
<div class="block">The default rshell port.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#MAX_CLIENT_PORT">MAX_CLIENT_PORT</a></strong></code>
<div class="block">The largest port number an rcmd client may use.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#MIN_CLIENT_PORT">MIN_CLIENT_PORT</a></strong></code>
<div class="block">The smallest port number an rcmd client may use.</div>
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<h3>Fields inherited from class org.apache.commons.net.bsd.<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html" title="class in org.apache.commons.net.bsd">RExecClient</a></h3>
<code><a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#_errorStream_">_errorStream_</a></code></li>
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<h3>Fields inherited from class org.apache.commons.net.<a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">SocketClient</a></h3>
<code><a href="../../../../../org/apache/commons/net/SocketClient.html#_defaultPort_">_defaultPort_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#_input_">_input_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#_output_">_output_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#_serverSocketFactory_">_serverSocketFactory_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#_socket_">_socket_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#_socketFactory_">_socketFactory_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#_timeout_">_timeout_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#connectTimeout">connectTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#NETASCII_EOL">NETASCII_EOL</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#RCommandClient()">RCommandClient</a></strong>()</code>
<div class="block">The default RCommandClient constructor.</div>
</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#connect(java.net.InetAddress, int)">connect</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> host,
int port)</code>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the current host at a port in a range acceptable
to the BSD rshell daemon.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#connect(java.net.InetAddress, int, java.net.InetAddress)">connect</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> host,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr)</code>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address using a port in a range
acceptable to the BSD rshell daemon.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#connect(java.net.InetAddress, int, java.net.InetAddress, int)">connect</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> host,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr,
int localPort)</code>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address and port.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#connect(java.lang.String, int)">connect</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hostname,
int port)</code>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the current host at a port in a range acceptable
to the BSD rshell daemon.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#connect(java.lang.String, int, java.net.InetAddress)">connect</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hostname,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr)</code>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address using a port in a range
acceptable to the BSD rshell daemon.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#connect(java.lang.String, int, java.net.InetAddress, int)">connect</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hostname,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr,
int localPort)</code>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address and port.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#rcommand(java.lang.String, java.lang.String, java.lang.String)">rcommand</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> localUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> remoteUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> command)</code>
<div class="block">Same as
<code> rcommand(localUsername, remoteUsername, command, false); </code></div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/net/bsd/RCommandClient.html#rcommand(java.lang.String, java.lang.String, java.lang.String, boolean)">rcommand</a></strong>(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> localUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> remoteUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> command,
boolean separateErrorStream)</code>
<div class="block">Remotely executes a command through the rshd daemon on the server
to which the RCommandClient is connected.</div>
</td>
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<h3>Methods inherited from class org.apache.commons.net.bsd.<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html" title="class in org.apache.commons.net.bsd">RExecClient</a></h3>
<code><a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#disconnect()">disconnect</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getErrorStream()">getErrorStream</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getInputStream()">getInputStream</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getOutputStream()">getOutputStream</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#isRemoteVerificationEnabled()">isRemoteVerificationEnabled</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#rexec(java.lang.String, java.lang.String, java.lang.String)">rexec</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#rexec(java.lang.String, java.lang.String, java.lang.String, boolean)">rexec</a>, <a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#setRemoteVerificationEnabled(boolean)">setRemoteVerificationEnabled</a></code></li>
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<h3>Methods inherited from class org.apache.commons.net.<a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">SocketClient</a></h3>
<code><a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()">_connectAction_</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#connect(java.net.InetAddress)">connect</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#connect(java.lang.String)">connect</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getConnectTimeout()">getConnectTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getDefaultPort()">getDefaultPort</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getDefaultTimeout()">getDefaultTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getKeepAlive()">getKeepAlive</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getLocalAddress()">getLocalAddress</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getLocalPort()">getLocalPort</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getRemoteAddress()">getRemoteAddress</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getRemotePort()">getRemotePort</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getServerSocketFactory()">getServerSocketFactory</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getSoLinger()">getSoLinger</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getSoTimeout()">getSoTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#getTcpNoDelay()">getTcpNoDelay</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#isConnected()">isConnected</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setConnectTimeout(int)">setConnectTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setDefaultPort(int)">setDefaultPort</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setDefaultTimeout(int)">setDefaultTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setKeepAlive(boolean)">setKeepAlive</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setReceiveBufferSize(int)">setReceiveBufferSize</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setSendBufferSize(int)">setSendBufferSize</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setServerSocketFactory(javax.net.ServerSocketFactory)">setServerSocketFactory</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setSocketFactory(javax.net.SocketFactory)">setSocketFactory</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setSoLinger(boolean, int)">setSoLinger</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setSoTimeout(int)">setSoTimeout</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#setTcpNoDelay(boolean)">setTcpNoDelay</a>, <a href="../../../../../org/apache/commons/net/SocketClient.html#verifyRemote(java.net.Socket)">verifyRemote</a></code></li>
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<code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<pre>public static final int DEFAULT_PORT</pre>
<div class="block">The default rshell port. Set to 514 in BSD Unix.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.net.bsd.RCommandClient.DEFAULT_PORT">Constant Field Values</a></dd></dl>
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<pre>public static final int MIN_CLIENT_PORT</pre>
<div class="block">The smallest port number an rcmd client may use. By BSD convention
this number is 512.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.net.bsd.RCommandClient.MIN_CLIENT_PORT">Constant Field Values</a></dd></dl>
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<pre>public static final int MAX_CLIENT_PORT</pre>
<div class="block">The largest port number an rcmd client may use. By BSD convention
this number is 1023.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.commons.net.bsd.RCommandClient.MAX_CLIENT_PORT">Constant Field Values</a></dd></dl>
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<pre>public RCommandClient()</pre>
<div class="block">The default RCommandClient constructor. Initializes the
default port to <code> DEFAULT_PORT </code>.</div>
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<pre>public void connect(<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> host,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/BindException.html?is-external=true" title="class or interface in java.net">BindException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address using a port in a range
acceptable to the BSD rshell daemon.
Before returning, <a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()"><code>_connectAction_() </code></a>
is called to perform connection initialization actions.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>host</code> - The remote host.</dd><dd><code>port</code> - The port to connect to on the remote host.</dd><dd><code>localAddr</code> - The local address to use.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a></code> - If the socket timeout could not be set.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/BindException.html?is-external=true" title="class or interface in java.net">BindException</a></code> - If all acceptable rshell ports are in use.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the socket could not be opened. In most
cases you will only want to catch IOException since SocketException is
derived from it.</dd></dl>
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<pre>public void connect(<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> host,
int port)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the current host at a port in a range acceptable
to the BSD rshell daemon.
Before returning, <a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()"><code>_connectAction_() </code></a>
is called to perform connection initialization actions.
<p></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/net/SocketClient.html#connect(java.net.InetAddress, int)">connect</a></code> in class <code><a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">SocketClient</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>host</code> - The remote host.</dd><dd><code>port</code> - The port to connect to on the remote host.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a></code> - If the socket timeout could not be set.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/BindException.html?is-external=true" title="class or interface in java.net">BindException</a></code> - If all acceptable rshell ports are in use.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the socket could not be opened. In most
cases you will only want to catch IOException since SocketException is
derived from it.</dd></dl>
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<pre>public void connect(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hostname,
int port)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></pre>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the current host at a port in a range acceptable
to the BSD rshell daemon.
Before returning, <a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()"><code>_connectAction_() </code></a>
is called to perform connection initialization actions.
<p></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/net/SocketClient.html#connect(java.lang.String, int)">connect</a></code> in class <code><a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">SocketClient</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>hostname</code> - The name of the remote host.</dd><dd><code>port</code> - The port to connect to on the remote host.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a></code> - If the socket timeout could not be set.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/BindException.html?is-external=true" title="class or interface in java.net">BindException</a></code> - If all acceptable rshell ports are in use.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the socket could not be opened. In most
cases you will only want to catch IOException since SocketException is
derived from it.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></code> - If the hostname cannot be resolved.</dd></dl>
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<pre>public void connect(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hostname,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address using a port in a range
acceptable to the BSD rshell daemon.
Before returning, <a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()"><code>_connectAction_() </code></a>
is called to perform connection initialization actions.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>hostname</code> - The remote host.</dd><dd><code>port</code> - The port to connect to on the remote host.</dd><dd><code>localAddr</code> - The local address to use.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a></code> - If the socket timeout could not be set.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/BindException.html?is-external=true" title="class or interface in java.net">BindException</a></code> - If all acceptable rshell ports are in use.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the socket could not be opened. In most
cases you will only want to catch IOException since SocketException is
derived from it.</dd></dl>
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<pre>public void connect(<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> host,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr,
int localPort)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></pre>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address and port. The
local port must lie between <code> MIN_CLIENT_PORT </code> and
<code> MAX_CLIENT_PORT </code> or an IllegalArgumentException will
be thrown.
Before returning, <a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()"><code>_connectAction_() </code></a>
is called to perform connection initialization actions.
<p></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/net/SocketClient.html#connect(java.net.InetAddress, int, java.net.InetAddress, int)">connect</a></code> in class <code><a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">SocketClient</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>host</code> - The remote host.</dd><dd><code>port</code> - The port to connect to on the remote host.</dd><dd><code>localAddr</code> - The local address to use.</dd><dd><code>localPort</code> - The local port to use.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a></code> - If the socket timeout could not be set.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the socket could not be opened. In most
cases you will only want to catch IOException since SocketException is
derived from it.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - If an invalid local port number
is specified.</dd></dl>
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<pre>public void connect(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> hostname,
int port,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> localAddr,
int localPort)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a>,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></pre>
<div class="block">Opens a Socket connected to a remote host at the specified port and
originating from the specified local address and port. The
local port must lie between <code> MIN_CLIENT_PORT </code> and
<code> MAX_CLIENT_PORT </code> or an IllegalArgumentException will
be thrown.
Before returning, <a href="../../../../../org/apache/commons/net/SocketClient.html#_connectAction_()"><code>_connectAction_() </code></a>
is called to perform connection initialization actions.
<p></div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/net/SocketClient.html#connect(java.lang.String, int, java.net.InetAddress, int)">connect</a></code> in class <code><a href="../../../../../org/apache/commons/net/SocketClient.html" title="class in org.apache.commons.net">SocketClient</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>hostname</code> - The name of the remote host.</dd><dd><code>port</code> - The port to connect to on the remote host.</dd><dd><code>localAddr</code> - The local address to use.</dd><dd><code>localPort</code> - The local port to use.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/SocketException.html?is-external=true" title="class or interface in java.net">SocketException</a></code> - If the socket timeout could not be set.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the socket could not be opened. In most
cases you will only want to catch IOException since SocketException is
derived from it.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></code> - If the hostname cannot be resolved.</dd>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - If an invalid local port number
is specified.</dd></dl>
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<pre>public void rcommand(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> localUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> remoteUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> command,
boolean separateErrorStream)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Remotely executes a command through the rshd daemon on the server
to which the RCommandClient is connected. After calling this method,
you may interact with the remote process through its standard input,
output, and error streams. You will typically be able to detect
the termination of the remote process after reaching end of file
on its standard output (accessible through
<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#getInputStream()"><code>getInputStream() </code></a>. Disconnecting
from the server or closing the process streams before reaching
end of file will not necessarily terminate the remote process.
<p>
If a separate error stream is requested, the remote server will
connect to a local socket opened by RCommandClient, providing an
independent stream through which standard error will be transmitted.
The local socket must originate from a secure port (512 - 1023),
and rcommand() ensures that this will be so.
RCommandClient will also do a simple security check when it accepts a
connection for this error stream. If the connection does not originate
from the remote server, an IOException will be thrown. This serves as
a simple protection against possible hijacking of the error stream by
an attacker monitoring the rexec() negotiation. You may disable this
behavior with
<a href="../../../../../org/apache/commons/net/bsd/RExecClient.html#setRemoteVerificationEnabled(boolean)"><code>setRemoteVerificationEnabled()</code></a>
.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>localUsername</code> - The user account on the local machine that is
requesting the command execution.</dd><dd><code>remoteUsername</code> - The account name on the server through which to
execute the command.</dd><dd><code>command</code> - The command, including any arguments, to execute.</dd><dd><code>separateErrorStream</code> - True if you would like the standard error
to be transmitted through a different stream than standard output.
False if not.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If the rcommand() attempt fails. The exception
will contain a message indicating the nature of the failure.</dd></dl>
</li>
</ul>
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<h4>rcommand</h4>
<pre>public void rcommand(<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> localUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> remoteUsername,
<a href="file:///usr/share/doc/default-jdk-doc/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> command)
throws <a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Same as
<code> rcommand(localUsername, remoteUsername, command, false); </code></div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="file:///usr/share/doc/default-jdk-doc/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd></dl>
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