Java/Network Protocol/Net Command
Содержание
Connects to an rexec server
/*
* Copyright 2001-2005 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 examples;
import java.io.IOException;
import org.apache.rumons.net.bsd.RExecClient;
/***
* This is an example program demonstrating how to use the RExecClient class.
* This program connects to an rexec server and requests that the
* given command be executed on the server. It then reads input from stdin
* (this will be line buffered on most systems, so don"t expect character
* at a time interactivity), passing it to the remote process and writes
* the process stdout and stderr to local stdout.
* <p>
* Example: java rexec myhost myusername mypassword "ps -aux"
* <p>
* Usage: rexec <hostname> <username> <password> <command>
* <p>
***/
// This class requires the IOUtil support class!
public class rexec
{
public static final void main(String[] args)
{
String server, username, password, command;
RExecClient client;
if (args.length != 4)
{
System.err.println(
"Usage: rexec <hostname> <username> <password> <command>");
System.exit(1);
return ; // so compiler can do proper flow control analysis
}
client = new RExecClient();
server = args[0];
username = args[1];
password = args[2];
command = args[3];
try
{
client.connect(server);
}
catch (IOException e)
{
System.err.println("Could not connect to server.");
e.printStackTrace();
System.exit(1);
}
try
{
client.rexec(username, password, command);
}
catch (IOException e)
{
try
{
client.disconnect();
}
catch (IOException f)
{}
e.printStackTrace();
System.err.println("Could not execute command.");
System.exit(1);
}
IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
System.in, System.out);
try
{
client.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
System.exit(0);
}
}
Connects to an rlogin daemon
/*
* Copyright 2001-2005 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 examples;
import java.io.IOException;
import org.apache.rumons.net.bsd.RLoginClient;
/***
* This is an example program demonstrating how to use the RLoginClient
* class. This program connects to an rlogin daemon and begins to
* interactively read input from stdin (this will be line buffered on most
* systems, so don"t expect character at a time interactivity), passing it
* to the remote login process and writing the remote stdout and stderr
* to local stdout. If you don"t have .rhosts or hosts.equiv files set up,
* the rlogin daemon will prompt you for a password.
* <p>
* On Unix systems you will not be able to use the rshell capability
* unless the process runs as root since only root can bind port addresses
* lower than 1024.
* <p>
* JVM"s using green threads will likely have problems if the rlogin daemon
* requests a password. This program is merely a demonstration and is
* not suitable for use as an application, especially given that it relies
* on line buffered input from System.in. The best way to run this example
* is probably from a Win95 dos box into a Unix host.
* <p>
* Example: java rlogin myhost localusername remoteusername vt100
* <p>
* Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>
* <p>
***/
// This class requires the IOUtil support class!
public class rlogin
{
public static final void main(String[] args)
{
String server, localuser, remoteuser, terminal;
RLoginClient client;
if (args.length != 4)
{
System.err.println(
"Usage: rlogin <hostname> <localuser> <remoteuser> <terminal>");
System.exit(1);
return ; // so compiler can do proper flow control analysis
}
client = new RLoginClient();
server = args[0];
localuser = args[1];
remoteuser = args[2];
terminal = args[3];
try
{
client.connect(server);
}
catch (IOException e)
{
System.err.println("Could not connect to server.");
e.printStackTrace();
System.exit(1);
}
try
{
client.rlogin(localuser, remoteuser, terminal);
}
catch (IOException e)
{
try
{
client.disconnect();
}
catch (IOException f)
{}
e.printStackTrace();
System.err.println("rlogin authentication failed.");
System.exit(1);
}
IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
System.in, System.out);
try
{
client.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
System.exit(0);
}
}
Connects to an rshell daemon
/*
* Copyright 2001-2005 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 examples;
import java.io.IOException;
import org.apache.rumons.net.bsd.RCommandClient;
/***
* This is an example program demonstrating how to use the RCommandClient
* class. This program connects to an rshell daemon and requests that the
* given command be executed on the server. It then reads input from stdin
* (this will be line buffered on most systems, so don"t expect character
* at a time interactivity), passing it to the remote process and writes
* the process stdout and stderr to local stdout.
* <p>
* On Unix systems you will not be able to use the rshell capability
* unless the process runs as root since only root can bind port addresses
* lower than 1024.
* <p>
* Example: java rshell myhost localusername remoteusername "ps -aux"
* <p>
* Usage: rshell <hostname> <localuser> <remoteuser> <command>
* <p>
***/
// This class requires the IOUtil support class!
public class rshell
{
public static final void main(String[] args)
{
String server, localuser, remoteuser, command;
RCommandClient client;
if (args.length != 4)
{
System.err.println(
"Usage: rshell <hostname> <localuser> <remoteuser> <command>");
System.exit(1);
return ; // so compiler can do proper flow control analysis
}
client = new RCommandClient();
server = args[0];
localuser = args[1];
remoteuser = args[2];
command = args[3];
try
{
client.connect(server);
}
catch (IOException e)
{
System.err.println("Could not connect to server.");
e.printStackTrace();
System.exit(1);
}
try
{
client.rcommand(localuser, remoteuser, command);
}
catch (IOException e)
{
try
{
client.disconnect();
}
catch (IOException f)
{}
e.printStackTrace();
System.err.println("Could not execute command.");
System.exit(1);
}
IOUtil.readWrite(client.getInputStream(), client.getOutputStream(),
System.in, System.out);
try
{
client.disconnect();
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
System.exit(0);
}
}
Finger client
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
import java.util.StringTokenizer;
public class Finger {
public static void main(String[] arguments) throws Exception {
StringTokenizer split = new StringTokenizer(arguments[0], "@");
String user = split.nextToken();
String host = split.nextToken();
Socket digit = new Socket(host, 79);
digit.setSoTimeout(20000);
PrintStream out = new PrintStream(digit.getOutputStream());
out.print(user + "\015\012");
BufferedReader in = new BufferedReader(new InputStreamReader(digit.getInputStream()));
boolean eof = false;
while (!eof) {
String line = in.readLine();
if (line != null)
System.out.println(line);
else
eof = true;
}
digit.close();
}
}
Implement the finger command in Java
/*
* Copyright 2001-2005 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 examples;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.apache.rumons.net.FingerClient;
/***
* This is an example of how you would implement the finger command
* in Java using NetComponents. The Java version is much shorter.
* But keep in mind that the Unix finger command reads all sorts of
* local files to output local finger information. This program only
* queries the finger daemon.
* <p>
* The -l flag is used to request long output from the server.
* <p>
***/
public class finger
{
public static final void main(String[] args)
{
boolean longOutput = false;
int arg = 0, index;
String handle, host;
FingerClient finger;
InetAddress address = null;
// Get flags. If an invalid flag is present, exit with usage message.
while (arg < args.length && args[arg].startsWith("-"))
{
if (args[arg].equals("-l"))
longOutput = true;
else
{
System.err.println("usage: finger [-l] [[[handle][@<server>]] ...]");
System.exit(1);
}
++arg;
}
finger = new FingerClient();
// We want to timeout if a response takes longer than 60 seconds
finger.setDefaultTimeout(60000);
if (arg >= args.length)
{
// Finger local host
try
{
address = InetAddress.getLocalHost();
}
catch (UnknownHostException e)
{
System.err.println("Error unknown host: " + e.getMessage());
System.exit(1);
}
try
{
finger.connect(address);
System.out.print(finger.query(longOutput));
finger.disconnect();
}
catch (IOException e)
{
System.err.println("Error I/O exception: " + e.getMessage());
System.exit(1);
}
return ;
}
// Finger each argument
while (arg < args.length)
{
index = args[arg].lastIndexOf("@");
if (index == -1)
{
handle = args[arg];
try
{
address = InetAddress.getLocalHost();
}
catch (UnknownHostException e)
{
System.err.println("Error unknown host: " + e.getMessage());
System.exit(1);
}
}
else
{
handle = args[arg].substring(0, index);
host = args[arg].substring(index + 1);
try
{
address = InetAddress.getByName(host);
}
catch (UnknownHostException e)
{
System.err.println("Error unknown host: " + e.getMessage());
System.exit(1);
}
}
System.out.println("[" + address.getHostName() + "]");
try
{
finger.connect(address);
System.out.print(finger.query(longOutput, handle));
finger.disconnect();
}
catch (IOException e)
{
System.err.println("Error I/O exception: " + e.getMessage());
System.exit(1);
}
++arg;
if (arg != args.length)
System.out.print("\n");
}
}
}
Implement the Linux fwhois command in Java
/*
* Copyright 2001-2005 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 examples;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import org.apache.rumons.net.WhoisClient;
/***
* This is an example of how you would implement the Linux fwhois command
* in Java using NetComponents. The Java version is much shorter.
* <p>
***/
public class fwhois
{
public static final void main(String[] args)
{
int index;
String handle, host;
InetAddress address = null;
WhoisClient whois;
if (args.length != 1)
{
System.err.println("usage: fwhois handle[@<server>]");
System.exit(1);
}
index = args[0].lastIndexOf("@");
whois = new WhoisClient();
// We want to timeout if a response takes longer than 60 seconds
whois.setDefaultTimeout(60000);
if (index == -1)
{
handle = args[0];
host = WhoisClient.DEFAULT_HOST;
}
else
{
handle = args[0].substring(0, index);
host = args[0].substring(index + 1);
}
try
{
address = InetAddress.getByName(host);
}
catch (UnknownHostException e)
{
System.err.println("Error unknown host: " + e.getMessage());
System.exit(1);
}
System.out.println("[" + address.getHostName() + "]");
try
{
whois.connect(address);
System.out.print(whois.query(handle));
whois.disconnect();
}
catch (IOException e)
{
System.err.println("Error I/O exception: " + e.getMessage());
System.exit(1);
}
}
}
Use the TimeTCPClient and TimeUDPClient: simple Unix rdate
/*
* Copyright 2001-2005 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 examples;
import java.io.IOException;
import java.net.InetAddress;
import org.apache.rumons.net.TimeTCPClient;
import org.apache.rumons.net.TimeUDPClient;
/***
* This is an example program demonstrating how to use the TimeTCPClient
* and TimeUDPClient classes. It"s very similar to the simple Unix rdate
* command. This program connects to the default time service port of a
* specified server, retrieves the time, and prints it to standard output.
* The default is to use the TCP port. Use the -udp flag to use the UDP
* port. You can test this program by using the NIST time server at
* 132.163.135.130 (warning: the IP address may change).
* <p>
* Usage: rdate [-udp] <hostname>
* <p>
* <p>
* @author Daniel F. Savarese
***/
public class rdate
{
public static final void timeTCP(String host) throws IOException
{
TimeTCPClient client = new TimeTCPClient();
// We want to timeout if a response takes longer than 60 seconds
client.setDefaultTimeout(60000);
client.connect(host);
System.out.println(client.getDate().toString());
client.disconnect();
}
public static final void timeUDP(String host) throws IOException
{
TimeUDPClient client = new TimeUDPClient();
// We want to timeout if a response takes longer than 60 seconds
client.setDefaultTimeout(60000);
client.open();
System.out.println(client.getDate(InetAddress.getByName(host)).toString());
client.close();
}
public static final void main(String[] args)
{
if (args.length == 1)
{
try
{
timeTCP(args[0]);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
}
else if (args.length == 2 && args[0].equals("-udp"))
{
try
{
timeUDP(args[1]);
}
catch (IOException e)
{
e.printStackTrace();
System.exit(1);
}
}
else
{
System.err.println("Usage: rdate [-udp] <hostname>");
System.exit(1);
}
}
}
