Java/Network Protocol/Net Command
Содержание
Connects to an rexec server
<source lang="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 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.*
* 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); } } </source>
Connects to an rlogin daemon
<source lang="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 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);
}
}
</source>
Connects to an rshell daemon
<source lang="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 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);
}
}
</source>
Finger client
<source lang="java">
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();
}
}
</source>
Implement the finger command in Java
<source lang="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");
}
}
}
</source>
Implement the Linux fwhois command in Java
<source lang="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);
}
}
}
</source>
Use the TimeTCPClient and TimeUDPClient: simple Unix rdate
<source lang="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 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);
}
}
}
</source>
