Re: Router filtering not enough! (Was: Re: CERT advisory )
Pete Shipley (shipley@merde.dis.org)
Thu, 26 Jan 1995 23:12:02 -0800
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>> MAC address on a connection and to be worried if it came from a list of=
=
>> routers but the address was the local net?
>
>I think you'll find that the MAC addresses are unavailable once the packe=
t
>has passed through the ethernet code. I went digging yesterday, looking
>for _any_ way to get at the MAC header from the IP routines and found, no=
t
>surprisingly, that the MAC header is kept separately to the rest of the
>packet, which is passed upto the IP stuff as an mbuf.
look at the ioctl SIOCGARP, for a source code referance look at the
program getethers by Dave Curry.
-Pete
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