?
Solved

TFTP Server in Java - stages in program

Posted on 2006-10-29
4
Medium Priority
?
1,080 Views
Last Modified: 2010-05-18
Hi everyone,

Hopefully someone can point me in the right direction.  This question could also be posted in the networking section I suppose, but here goes...

I'm very new to Java, and I'm trying to write a TFTP server in Java, but only the basics (read, write and error codes).  Also, it not GUI based, just command-line.

I've been given this as a project, and I'm NOT looking for the code so please don't take offence thinking that all I want is the code!

I've looked at the RFC 1350 (version 2) on TFTP, and have made an attempt at the program, the problem I'm having is that I'm finding it difficulty trying to work out the stages I should be going through.

So far this is what I have:

I've set the DEFAULT_PORT to 69, MAX_PACKET_SIZE to 512, and TFTP_FILE_PATH = "c:\\TFTPSERVER\\"

Rather than tell you the code I have written, I'll list the stages:
- Check port number is in range between 0 and 65535 (incase they override the 69 already entered)
- if using 69, or valid port entered then get IP address of local machine, print IP address and port number using
- Check opcode (for read, write, ack, error, data etc)
- print filename requested to screen, state if PUT or GET (just for my own use)
- that's all I've got so far!

Am I heading in totally the wrong direction?  Can anyone list the stages I should be going through?  Do I need to get TID or is that the same as the port?  That's the bit that confused me from the RFC.

Again, I'm not after code, just a bulleted list of stages the code should go through, hope this makes sense.

Cheers

Macey
0
Comment
Question by:mgrice
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 9

Accepted Solution

by:
shinobun earned 2000 total points
ID: 17830371
You might want to read the "Details of a TFTP session" section in the wikipedia article [1] to see the general lifecycle of a TFTP session.

Also, speaking in general, you shouldn't be using ports between 0 and 1024, as they are "reserved" as well-known ports [2].  Of course, 69 is your only exception as it is "reserved" for TFTP.  :)

[1] http://en.wikipedia.org/wiki/Tftp
[2] http://en.wikipedia.org/wiki/List_of_well-known_ports_%28computing%29
0
 
LVL 9

Expert Comment

by:shinobun
ID: 17830385
>> you shouldn't be using ports between 0 and 1024

Reading your question again, I guess you're considering the user to be able to override the service port.  I guess that's OK.  :)
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
This video teaches viewers about errors in exception handling.
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question