Retrieving network mask in Python

Question

How would one go about retrieving a network device\'s netmask (In Linux preferably, but if it\'s cross-platform then cool)? I know how in C on Linux but I can\'t find a way

Answer 1

This works for me in Python 2.2 on Linux:

iface = "eth0"
socket.inet_ntoa(fcntl.ioctl(socket.socket(socket.AF_INET, socket.SOCK_DGRAM), 35099, struct.pack('256s', iface))[20:24])