_grains__my_grains.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import salt.config
import salt.loader

from socket import AF_INET, inet_pton
from struct import unpack

def ip_type():
    minion_config = salt.config.minion_config('/etc/salt/minion')
    minion_grains = salt.loader.grains(minion_config)
    grains = {}
    ip_addresses = minion_grains.get('ipv4')
    if ip_addresses:
        for ip in ip_addresses:
            f = unpack('!I',inet_pton(AF_INET,ip))[0]
            private = (
                [ 3232235520, 4294901760 ], # 192.168.0.0, 255.255.0.0 http://tools.ietf.org/html/rfc1918
                [ 2886729728, 4293918720 ], # 172.16.0.0,  255.240.0.0 http://tools.ietf.org/html/rfc1918
                [ 167772160,  4278190080 ], # 10.0.0.0,    255.0.0.0   http://tools.ietf.org/html/rfc1918
            )
            for net in private:
                if (f & net[1]) == net[0]:
                    grains['local_ip'] = ip
                else:
                    grains['public_ip'] = ip
    return grains

if __name__ == "__main__":
    print ip_type()