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stream4 reassembly seems to lose last packet
From: Daniel OKeefe <dokeefe_nh () yahoo com>
Date: Thu, 24 Apr 2003 18:05:23 -0700 (PDT)
Hi I am using snort to trap a full message (composed of multiple tcp packets) tcp stream re-assembled, based on a portion of the content of the message. To do this, I am using the stream4 pre-processing. Basically, I want to alert only on the full stream, AFTER it has been fully assembled and dump it to a log. It almost works fine, except for one problem - all the packets except the last one get logged. The last packet ends up getting jammed into the beginning of the next logged message. Its almost as if when the message is logged, it forgets to write out the last packet and so that packet remains in memory for the next logged message. My config file has the settings: =========================================== config stateful config quiet config dump_payload preprocessor stream4 preprocessor stream4_reassemble: both ports "all" noalerts My rule uses the options: ==================================== flow:established,only_stream; content: "|3C3F786D6C|"; Average reassembled message size to be logged is about 10k. Anyone got any ideas? I've tried all sorts of configuration settings but this behavior seems to be pretty consistent. I hope I'm doing something daft. Thanks for any help. Dan O'Keefe __________________________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo http://search.yahoo.com ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
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- stream4 reassembly seems to lose last packet Daniel OKeefe (Apr 24)