chinanet.py 文件源码

def convert(self, net):
        parts = net.split('/')
        if len(parts) != 2:
            return (-1, -1)
        ip_s, mask_s = parts[0], parts[1]
        if ip_s and mask_s:
            try:
                ip = struct.unpack('>I', socket.inet_aton(ip_s))[0]
            except socket.error:
                return (-1, -1)
            mask = int(mask_s)
            if mask < 0 or mask > 32:
                return (-1, -1)
            hex_mask = 0xffffffff - (1 << (32 - mask)) + 1
            lowest = ip & hex_mask
            highest = lowest + (1 << (32 - mask)) - 1
            return (lowest, highest)