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Full Discussion: Adding gzip compression to a connection using nc
Top Forums Shell Programming and Scripting Adding gzip compression to a connection using nc Post 302604328 by Corona688 on Sunday 4th of March 2012 12:42:05 PM
Old 03-04-2012
Quote:
Originally Posted by haggismn
Hi again
I know that in most cases using ssh or ssl would be fine. Indeed I have both stunnel (ssl) and ssh versions of this connection working fine, with ssl being slightly faster.

However the overall objective is to demonstrate suricata's ability to decompress gzip data on the fly and detect patterns vs regular methods like iptables/layer7, which just look at the plaintext pattern rather than putting it together.
Hmmmm. How about two, separate netcat connections then, one going each way?

I'm not sure how the ability to decompress gzip on the fly is useful. Wouldn't that make it bigger?

Quote:
To do this, I will of course need a connection which uses gzip compression.
So send a gzip over netcat...
Quote:
If I can get this nc/gzip connection working, I then show that a regular layer7 rule will not be able to detect regex pattens that the test program ouputs. However it is expected that suricata will be able to detect the patterns.
I have not been able to make nc do what you want yet, despite much fiddling and trying. I have tried to do it the way you want. Unfortunately the way you want is silly. Anything which takes >1 named pipes to kludge into place cannot be the right tool for the job.

Do you have the C language available for a custom solution to be written?
 

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LEARN ABOUT LINUX

gzforce

GZFORCE(1)						      General Commands Manual							GZFORCE(1)

NAME

       gzforce - force a '.gz' extension on all gzip files

SYNOPSIS

       gzforce [ name ...  ]

DESCRIPTION

       gzforce	forces a .gz extension on all gzip files so that gzip will not compress them twice.  This can be useful for files with names trun-
       cated after a file transfer.  On systems with a 14 char limitation on file names, the original name is truncated to make room for  the  .gz
       suffix. For example, 12345678901234 is renamed to 12345678901.gz. A file name such as foo.tgz is left intact.

SEE ALSO

       gzip(1), gznew(1), gzmore(1), gzgrep(1), gzdiff(1), gzexe(1)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgzip	      |
       +--------------------+-----------------+
       |Interface Stability | External	      |
       +--------------------+-----------------+
NOTES

       Source for gzip is available in the SUNWgzipS package.

																	GZFORCE(1)
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