Re: faking source address in Java

Bill Frantz (frantz@netcom.com)
Fri, 25 Sep 1998 00:02:27 -0800

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At 7:43 PM -0800 9/24/98, Lewis McCarthy wrote:
>David Honig writes:
>> I'd like to modify the *source* address of UDP datagrams
>> sent from an application written in Java. Anyone know
>> how to do this? Levels below DatagramPackets seem opaque...
>
>I suspect this can't be done within Java, but would be interested to learn
>otherwise.
>
>I assume that java.net.DatagramSocket.send() uses a native sockets API to
>hand off the
>outgoing DatagramPacket payload (and dest IP/port) to the transport layer.
>Typically
>(AFAIK) sockets APIs don't provide facilities for an application to set
>the src IP addr.
>
>-Lewis
>"It depends on what the meaning of the word `is` is."

It is a bit more complex than that because you have SocketImpl involved,
but in essence that's it.

I thought one reason why we ran freshmen in user mode was to keep them from
faking from addresses. :-)

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