by Jem Berke » Sat, 14 Feb 2004 13:31:38
It's in the form of a small utility that can be used as a stream filter,
for extracting IPs from a list that match a CIDR specification.
http://www.pc-tools.net/beta/cidr/cidr.c
Cheers,
--
Jem Berkes
http://www.sysdesign.ca/
by Jem Berke » Sun, 15 Feb 2004 17:04:13
An update, I've converted it into a more useful complete application:Quote:> I wrote a C function for one of my projects in order to compare an IP
> address to a CIDR-style net specification (e.g. 66.54.64.0/19).
> Thought I'd post the code here, in case anyone needs it.
> It's in the form of a small utility that can be used as a stream
> filter, for extracting IPs from a list that match a CIDR
> specification.
grepcidr can be used as a stream filter when you need to compare a list of
IP addresses against one or more Classless Inter-Domain Routing (CIDR) mask
specifications. Think of grepcidr as a CIDR-aware grep; instead of using
'grep 1.2.3.4' you can use 'grepcidr 1.2.3.4/30', for example. Multiple
specifications, of arbitrary mask lengths, can be specified both on the
command line or loaded from a file.
--
Jem Berkes
http://www.sysdesign.ca/
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