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"""Pure Python IP6 parsing and formatting
Copyright (c) 2006 Stuart Gathman <stuart@bmsi.com>
This module is free software, and you may redistribute it and/or modify
it under the same terms as Python itself, so long as this copyright message
and disclaimer are retained in their original form.
"""
from __future__ import print_function
import struct
#from spf import RE_IP4
import re
PAT_IP4 = r'\.'.join([r'(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])']*4)
RE_IP4 = re.compile(PAT_IP4+'$')
def inet_ntop(s):
"""
Convert ip6 address to standard hex notation.
Examples:
>>> inet_ntop(struct.pack("!HHHHHHHH",0,0,0,0,0,0xFFFF,0x0102,0x0304))
'::FFFF:1.2.3.4'
>>> inet_ntop(struct.pack("!HHHHHHHH",0x1234,0x5678,0,0,0,0,0x0102,0x0304))
'1234:5678::102:304'
>>> inet_ntop(struct.pack("!HHHHHHHH",0,0,0,0x1234,0x5678,0,0x0102,0x0304))
'::1234:5678:0:102:304'
>>> inet_ntop(struct.pack("!HHHHHHHH",0x1234,0x5678,0,0x0102,0x0304,0,0,0))
'1234:5678:0:102:304::'
>>> inet_ntop(struct.pack("!HHHHHHHH",0,0,0,0,0,0,0,0))
'::'
"""
# convert to 8 words
a = struct.unpack("!HHHHHHHH",s)
n = (0,0,0,0,0,0,0,0) # null ip6
if a == n: return '::'
# check for ip4 mapped
if a[:5] == (0,0,0,0,0) and a[5] in (0,0xFFFF):
ip4 = '.'.join([str(i) for i in struct.unpack("!BBBB",s[12:])])
if a[5]:
return "::FFFF:" + ip4
return "::" + ip4
# find index of longest sequence of 0
for l in (7,6,5,4,3,2,1):
e = n[:l]
for i in range(9-l):
if a[i:i+l] == e:
if i == 0:
return ':'+':%x'*(8-l) % a[l:]
if i == 8 - l:
return '%x:'*(8-l) % a[:-l] + ':'
return '%x:'*i % a[:i] + ':%x'*(8-l-i) % a[i+l:]
return "%x:%x:%x:%x:%x:%x:%x:%x" % a
def inet_pton(p):
"""
Convert ip6 standard hex notation to ip6 address.
Examples:
>>> struct.unpack('!HHHHHHHH',inet_pton('::'))
(0, 0, 0, 0, 0, 0, 0, 0)
>>> struct.unpack('!HHHHHHHH',inet_pton('::1234'))
(0, 0, 0, 0, 0, 0, 0, 4660)
>>> struct.unpack('!HHHHHHHH',inet_pton('1234::'))
(4660, 0, 0, 0, 0, 0, 0, 0)
>>> struct.unpack('!HHHHHHHH',inet_pton('1234::5678'))
(4660, 0, 0, 0, 0, 0, 0, 22136)
>>> struct.unpack('!HHHHHHHH',inet_pton('::FFFF:1.2.3.4'))
(0, 0, 0, 0, 0, 65535, 258, 772)
>>> struct.unpack('!HHHHHHHH',inet_pton('1.2.3.4'))
(0, 0, 0, 0, 0, 65535, 258, 772)
>>> try: inet_pton('::1.2.3.4.5')
... except ValueError as x: print(x)
::1.2.3.4.5
"""
if p == '::':
return b'\0'*16
s = p
m = RE_IP4.search(s)
try:
if m:
pos = m.start()
ip4 = [int(i) for i in s[pos:].split('.')]
if not pos:
return struct.pack('!QLBBBB',0,65535,*ip4)
s = s[:pos]+'%x%02x:%x%02x'%tuple(ip4)
a = s.split('::')
if len(a) == 2:
l,r = a
if not l:
r = r.split(':')
return struct.pack('!HHHHHHHH',
*[0]*(8-len(r)) + [int(s,16) for s in r])
if not r:
l = l.split(':')
return struct.pack('!HHHHHHHH',
*[int(s,16) for s in l] + [0]*(8-len(l)))
l = l.split(':')
r = r.split(':')
return struct.pack('!HHHHHHHH',
*[int(s,16) for s in l] + [0]*(8-len(l)-len(r))
+ [int(s,16) for s in r])
if len(a) == 1:
return struct.pack('!HHHHHHHH',
*[int(s,16) for s in a[0].split(':')])
except ValueError: pass
raise ValueError(p)
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