A simple Java tftp client
/*
* 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.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.SocketException;
import java.net.UnknownHostException;
import org.apache.commons.net.tftp.TFTP;
import org.apache.commons.net.tftp.TFTPClient;
/***
* This is an example of a simple Java tftp client using NetComponents.
* Notice how all of the code is really just argument processing and
* error handling.
* <p>
* Usage: tftp [options] hostname localfile remotefile
* hostname - The name of the remote host
* localfile - The name of the local file to send or the name to use for
* the received file
* remotefile - The name of the remote file to receive or the name for
* the remote server to use to name the local file being sent.
* options: (The default is to assume -r -b)
* -s Send a local file
* -r Receive a remote file
* -a Use ASCII transfer mode
* -b Use binary transfer mode
* <p>
***/
public class tftp
{
static final String USAGE =
"Usage: tftp [options] hostname localfile remotefile\n\n" +
"hostname - The name of the remote host\n" +
"localfile - The name of the local file to send or the name to use for\n" +
"\tthe received file\n" +
"remotefile - The name of the remote file to receive or the name for\n" +
"\tthe remote server to use to name the local file being sent.\n\n" +
"options: (The default is to assume -r -b)\n" +
"\t-s Send a local file\n" +
"\t-r Receive a remote file\n" +
"\t-a Use ASCII transfer mode\n" +
"\t-b Use binary transfer mode\n";
public final static void main(String[] args)
{
boolean receiveFile = true, closed;
int transferMode = TFTP.BINARY_MODE, argc;
String arg, hostname, localFilename, remoteFilename;
TFTPClient tftp;
// Parse options
for (argc = 0; argc < args.length; argc++)
{
arg = args[argc];
if (arg.startsWith("-"))
{
if (arg.equals("-r"))
receiveFile = true;
else if (arg.equals("-s"))
receiveFile = false;
else if (arg.equals("-a"))
transferMode = TFTP.ASCII_MODE;
else if (arg.equals("-b"))
transferMode = TFTP.BINARY_MODE;
else
{
System.err.println("Error: unrecognized option.");
System.err.print(USAGE);
System.exit(1);
}
}
else
break;
}
// Make sure there are enough arguments
if (args.length - argc != 3)
{
System.err.println("Error: invalid number of arguments.");
System.err.print(USAGE);
System.exit(1);
}
// Get host and file arguments
hostname = args[argc];
localFilename = args[argc + 1];
remoteFilename = args[argc + 2];
// Create our TFTP instance to handle the file transfer.
tftp = new TFTPClient();
// We want to timeout if a response takes longer than 60 seconds
tftp.setDefaultTimeout(60000);
// Open local socket
try
{
tftp.open();
}
catch (SocketException e)
{
System.err.println("Error: could not open local UDP socket.");
System.err.println(e.getMessage());
System.exit(1);
}
// We haven't closed the local file yet.
closed = false;
// If we're receiving a file, receive, otherwise send.
if (receiveFile)
{
FileOutputStream output = null;
File file;
file = new File(localFilename);
// If file exists, don't overwrite it.
if (file.exists())
{
System.err.println("Error: " + localFilename + " already exists.");
System.exit(1);
}
// Try to open local file for writing
try
{
output = new FileOutputStream(file);
}
catch (IOException e)
{
tftp.close();
System.err.println("Error: could not open local file for writing.");
System.err.println(e.getMessage());
System.exit(1);
}
// Try to receive remote file via TFTP
try
{
tftp.receiveFile(remoteFilename, transferMode, output, hostname);
}
catch (UnknownHostException e)
{
System.err.println("Error: could not resolve hostname.");
System.err.println(e.getMessage());
System.exit(1);
}
catch (IOException e)
{
System.err.println(
"Error: I/O exception occurred while receiving file.");
System.err.println(e.getMessage());
System.exit(1);
}
finally
{
// Close local socket and output file
tftp.close();
try
{
output.close();
closed = true;
}
catch (IOException e)
{
closed = false;
System.err.println("Error: error closing file.");
System.err.println(e.getMessage());
}
}
if (!closed)
System.exit(1);
}
else
{
// We're sending a file
FileInputStream input = null;
// Try to open local file for reading
try
{
input = new FileInputStream(localFilename);
}
catch (IOException e)
{
tftp.close();
System.err.println("Error: could not open local file for reading.");
System.err.println(e.getMessage());
System.exit(1);
}
// Try to send local file via TFTP
try
{
tftp.sendFile(remoteFilename, transferMode, input, hostname);
}
catch (UnknownHostException e)
{
System.err.println("Error: could not resolve hostname.");
System.err.println(e.getMessage());
System.exit(1);
}
catch (IOException e)
{
System.err.println(
"Error: I/O exception occurred while sending file.");
System.err.println(e.getMessage());
System.exit(1);
}
finally
{
// Close local socket and input file
tftp.close();
try
{
input.close();
closed = true;
}
catch (IOException e)
{
closed = false;
System.err.println("Error: error closing file.");
System.err.println(e.getMessage());
}
}
if (!closed)
System.exit(1);
}
}
}
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