--- /dev/null 2013-04-12 15:25:34.000000000 +0800
+++ ip.py 2013-04-12 15:40:33.000000000 +0800
@@ -0,0 +1,70 @@
+import struct
+
+
+def ipv4_arg_to_bin(w, x, y, z):
+ """Generate unsigned int from components of IP address
+ returns: w << 24 | x << 16 | y << 8 | z"""
+ return (w << 24) | (x << 16) | (y << 8) | z
+
+
+def ipv4_to_bin(ip):
+ '''
+ Parse an IP address and return an unsigned int.
+ The IP address is in dotted decimal notation.
+ '''
+ args = [int(arg) for arg in ip.split('.')]
+ return ipv4_arg_to_bin(*args)
+
+
+def ipv4_to_str(ip):
+ """Generate IP address string from an unsigned int.
+ ip: unsigned int of form w << 24 | x << 16 | y << 8 | z
+ returns: ip address string w.x.y.z"""
+ w = (ip >> 24) & 0xff
+ x = (ip >> 16) & 0xff
+ y = (ip >> 8) & 0xff
+ z = ip & 0xff
+ return "%i.%i.%i.%i" % (w, x, y, z)
+
+IPV6_PACK_STR = '!8H'
+
+
+def ipv6_to_arg_list(ipv6):
+ '''
+ convert ipv6 string to a list of 8 different parts
+ '''
+ args = []
+ if '::' in ipv6:
+ h, t = ipv6.split('::')
+ h_list = [int(x, 16) for x in h.split(':')]
+ t_list = [int(x, 16) for x in t.split(':')]
+ args += h_list
+ zero = [0]
+ args += ((8 - len(h_list) - len(t_list)) * zero)
+ args += t_list
+ else:
+ args = [int(x, 16) for x in ipv6.split(':')]
+
+ return args
+
+
+def ipv6_to_bin(ipv6):
+ '''
+ convert ipv6 string to binary representation
+ '''
+ args = ipv6_to_arg_list(ipv6)
+ return struct.pack(IPV6_PACK_STR, *args)
+
+
+def bin_to_ipv6(bin_addr):
+ '''
+ convert binary representation to human readable string
+ '''
+ args = struct.unpack_from(IPV6_PACK_STR, bin_addr)
+ return ':'.join('%x' % x for x in args)
+
+if __name__ == '__main__':
+ a = ipv4_to_bin('10.28.197.1')
+ print ipv4_to_str(a)
+ print bin_to_ipv6(ipv6_to_bin('3f:10::1:2'))
+ print bin_to_ipv6(ipv6_to_bin('2013:da8:215:8f2:aa20:66ff:fe4c:9c3c'))
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