1 # Copyright (c) 2013 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 6 def inet_hwton(hw_addr): 7 """Converts a representation of an Ethernet address to its packed format. 8 9 @param hw_addr: A string representing an Ethernet address in hex format like 10 "BA:C0:11:C0:FF:EE", "BAC011C0FFEE" or already in its binary representation. 11 @return: The 6-byte binary form of the provided Ethernet address. 12 """ 13 if len(hw_addr) == 6: # Already in network format. 14 return hw_addr 15 if len(hw_addr) == 12: # Hex format without : in between. 16 return ''.join(chr(int(hw_addr[i:i + 2], 16)) for i in range(0, 12, 2)) 17 if len(hw_addr) == 17: # Hex format with : in between. 18 return ''.join(chr(int(hw_addr[i:i + 2], 16)) for i in range(0, 17, 3)) 19 20 21 def inet_ntohw(packed_hw_addr): 22 """Converts a binary packed Ethernet address to its hex representation. 23 24 @param packed_hw_addr: The 6-byte binary form of the provided Ethernet 25 address. 26 @return: The hex representation as in "AA:BB:CC:00:11:22". 27 """ 28 return '%.2X:%.2X:%.2X:%.2X:%.2X:%.2X' % tuple(map(ord, packed_hw_addr)) 29
