[Twisted-Python] matching ip ranges
Maarten ter Huurne
maarten at treewalker.org
Wed Aug 29 04:32:10 EDT 2007
On Wednesday 29 August 2007, Alec Matusis wrote:
> We need to match IP ranges of connections, were ranges are specified in the
> "/" notation (e.g. 10.10.2.0/24)
> What is the best way to do this without consuming too much CPU resources
> when the connection rate is very high?
Convert the IP address to an integer and check using an AND mask:
if ip & mask == base:
# in range
where "ip" is the IP address of the incoming connection as an integer, "mask"
is the netmask as an integer (/24 => 0xFFFFFF00) and "base" is the lowest IP
address in the range ("base & mask == base" must hold).
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