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TFTP Server in Java - stages in program

mgrice
mgrice asked
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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
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Commented:
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

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Commented:
>> 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.  :)
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