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Java method for modifying udp checksum

Posted on 2004-10-20
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Hi
I would like to know if there is a java method that enables the modification of the udp checksum field in the udp header? IF so then what method izzit?
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Question by:blaze_wk
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by:CEHJ
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You may need a raw socket library in Java (using JNI). Not sure if one exists though ...
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TimYates earned 250 total points
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I think this is as close as it gets:

http://jpcap.sourceforge.net/

But I may be wrong...  Basically, as CEHJ says, this cannot be done with java...  

You will need to write some C code to do this, and call it from java...

I *believe* that from java 1.5, they are looking at adding more "raw" socket support for java, but don't expect too much too soon ;-)
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by:TimYates
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Here's a JNI example which allows ICMP (Ping) requests.

It includes ll the c code and java required for doing a "Ping", so you should be able to alter it to create your UDP packets...

Hope it helps:

http://www.teamlinux.org.uk/saxm/projects/icmp/
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by:CEHJ
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A related problem is that Windows itself has not supported raw sockets until XP (much to the chagrin of the likes of Ian Gibson http://grc.com , who sees it as yet another tool to create Windoze malware)
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by:TimYates
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You could get an updated winsock.dll that did them in previous versions of Windows (you had to be administrator to make them)...yeah XP (I think) got rid of this limitation and added them natively, but SP2 took them back out again...  *sigh*

http://www.interact-sw.co.uk/iangblog/2004/08/12/norawsockets

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by:CEHJ
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LOL - sorry - *Steve* Gibson yes!. Ian Gibson is an hispanophile and author of the book "The English Vice" ;-)
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by:CEHJ
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8-)
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by:TimYates
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:-)
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