ip address from range script

[Karl Auer]

On Thu, 2010-07-29 at 15:54 +0200, Jozsi Vadkan wrote:
> TEST-A.txt: list of ip address ranges [AS/isp's in a country]
> TEST-B.txt: list of ip addresses
> 
> I just need to know, if an ip in the TEST-B.txt is in a range of
> TEST-A.txt

This is not a job for which a shell script is suited.

I would suggest python for this job, or any decent structured language
like C, C++, Java... perl as a last resort :-)

If you insist on using a shell script, look at the ipcalc program. It
will give you, for any network/mask, the minimum and maximum host
addresses in the network. If you normalised them so each octet was three
digits, and normalised the target IP address too, a simple comparison
would be possible. ipcalc normalises all addresses into binary, you
could use that directly instead of padding octets.

However, this is not going to be very fast, so hope that the number of
entries in at least one of your lists is very small... You could
preprocess the lists which would speed things up a bit.

Regards, K.

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Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
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