tcpdump mailing list archives

Re: Protocol headers-only capture?


From: Dustin Spicuzza <dustin () virtualroadside com>
Date: Wed, 17 Dec 2008 15:56:58 -0500

Guy Harris wrote:

On Dec 17, 2008, at 12:43 PM, Dustin Spicuzza wrote:

... as long as you trust that the header
values are ok (making sure that they stay in the bounds of the actual
packet size).

Don't do that.  Check against the incoming caplen, and check the sanity
of length fields.

Thats what I meant (the actual packet size would be the caplen). Sanity
was implied as well ;)

Dustin

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