Solved

TFTP Server in Java - stages in program

Posted on 2006-10-29
4
1,053 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
  • 2
4 Comments
 
LVL 9

Accepted Solution

by:
shinobun earned 500 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

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Suggested Solutions

Title # Comments Views Activity
word0 challenge 3 58
mockito example issue 8 38
thymeleaf natural templating vs JSP 2 30
Java Loop 4 22
An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Java Flight Recorder and Java Mission Control together create a complete tool chain to continuously collect low level and detailed runtime information enabling after-the-fact incident analysis. Java Flight Recorder is a profiling and event collectio…
The viewer will learn how to implement Singleton Design Pattern in Java.
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

746 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

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now