import ctypes.util
import errno
import os
import socket
libc = ctypes.CDLL(ctypes.util.find_library('c'))
def if_indextoname(ifindex):
libc.if_indextoname.argtypes = [ctypes.c_uint32, ctypes.c_char_p]
libc.if_indextoname.restype = ctypes.c_char_p
ifname = ctypes.create_string_buffer(16)
ifname = libc.if_indextoname(ifindex, ifname)
if not ifname:
err = errno.ENXIO
raise OSError(err, os.strerror(err))
return ifname
def open_udp_port(bindaddr, min, max):
"""
Try to open a UDP listening port in the given range
"""
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
for port in range(min, max + 1):
try:
sock.bind((bindaddr, port))
return sock, port
except:
pass
sock.close()
return None, None
