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Support IP ranges in INTERNAL_IPS

Author:
jdunck
Posted:
January 9, 2010
Language:
Python
Version:
1.1
Tags:
internal_ips cidr debugging ip security
Score:
0 (after 0 ratings)

CIDR ( http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing ) is a well-known IP range syntax. This CIDR_LIST class can be used to make ranges of IPs considered "internal" for Django's debugging and security purposes. (Django only ever needs to do "ip in INTERNAL_IPS" so contains is sufficient for the purpose.)

For example, to make localhost and the entire block of 10.0.0.* considered to be internal, use:

INTERNAL_IPS = CIDR_LIST([ '127.0.0.1', '10.0.0.0/24' ]) 

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class CIDR_LIST(list):
    def __init__(self, cidrs):
        self.cidrs = []
        try:
            #http://cheeseshop.python.org/pypi/IPv4_Utils/0.35
            import ipv4
            for cidr in cidrs:
                self.cidrs.append(ipv4.CIDR(cidr))
        except ImportError:
            pass
    def __contains__(self, ip):
        import ipv4
        try:
            for cidr in self.cidrs:
                if ipv4.CIDR(ip) in cidr:
                    return True
        except:
            pass
        return False

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