Python Class for Linux ARP Cache

arp.py

# MIT License (c) Sascha Spreitzer, 2015

class ArpEntry(object):
    def __init__(self, line):
        self.ip, self.hw_type, self.flags, self.hw_address, self.mask, self.device = \
            line.split()
    
    def __str__(self):
        return '%s: %s' % (self.ip, self.hw_address)
    
    def __repr__(self):
        return 'ArpEntry("%s")' % str(self)

class Arp(object):
    def __init__(self):
        self.sync()

    def sync(self):
        self.entries = []
        lines = open('/proc/net/arp').readlines()[1:]
        for line in lines:
            self.entries.append(ArpEntry(line))

    def __iter__(self):
        return iter(self.entries)

    def __getitem__(self, item):
        self.sync()
        for i in self.entries:
            if i.ip == item:
                return i
        raise KeyError('No such ip')