tcpdump mailing list archives

Re: Capture filter help


From: Jefferson Ogata <Jefferson.Ogata () noaa gov>
Date: Thu, 17 Jan 2008 20:12:36 +0000

On 2008-01-17 18:37, Jefferson Ogata wrote:
To get the next four octets, use:

tcp[((tcp[12:1] & 0xf0) >> 2):4 + 4] = 0xdeadbeef

Sorry, that latter case should have been:

tcp[(((tcp[12:1] & 0xf0) >> 2) + 4):4] = 0xdeadbeef

--
Jefferson Ogata <Jefferson.Ogata () noaa gov>
NOAA Computer Incident Response Team (N-CIRT) <ncirt () noaa gov>
"Never try to retrieve anything from a bear."--National Park Service
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