Signed-off-by: Can Zhang <[email protected]>
---
ryu/lib/ip.py | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
create mode 100644 ryu/lib/ip.py
diff --git a/ryu/lib/ip.py b/ryu/lib/ip.py
new file mode 100644
index 0000000..9077634
--- /dev/null
+++ b/ryu/lib/ip.py
@@ -0,0 +1,57 @@
+import struct
+
+def ipNum(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
+
+# ip eg '192.168.1.1'
+def ipv4_to_bin(ip):
+ "Parse an IP address and return an unsigned int."
+ args = [ int( arg ) for arg in ip.split( '.' ) ]
+ return ipNum( *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):
+ 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 bin
+ '''
+ args = ipv6_to_arg_list(ipv6)
+ return struct.pack(IPV6_PACK_STR, *args)
+
+def bin_to_ipv6(bin_addr):
+ 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('10::1:2'))
+ print bin_to_ipv6( ipv6_to_bin('2013:da8:215:8f2:aa20:66ff:fe4c:9c3c'))
+
--
1.7.11.1
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