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# -*- coding: iso-8859-15 -*-
"""IP4 address range set implementation.
Implements an IPv4-range type.
Copyright (C) 2006, Heiko Wundram.
Released under the MIT-license.
"""
# Version information
# -------------------
__author__ = "Heiko Wundram <me@modelnine.org>"
__version__ = "0.2"
__revision__ = "3"
__date__ = "2006-01-20"
# Imports
# -------
from paste.util import intset
import socket
import six
# IP4Range class
# --------------
class IP4Range(intset.IntSet):
"""IP4 address range class with efficient storage of address ranges.
Supports all set operations."""
_MINIP4 = 0
_MAXIP4 = (1<<32) - 1
_UNITYTRANS = "".join([chr(n) for n in range(256)])
_IPREMOVE = "0123456789."
def __init__(self,*args):
"""Initialize an ip4range class. The constructor accepts an unlimited
number of arguments that may either be tuples in the form (start,stop),
integers, longs or strings, where start and stop in a tuple may
also be of the form integer, long or string.
Passing an integer or long means passing an IPv4-address that's already
been converted to integer notation, whereas passing a string specifies
an address where this conversion still has to be done. A string
address may be in the following formats:
- 1.2.3.4 - a plain address, interpreted as a single address
- 1.2.3 - a set of addresses, interpreted as 1.2.3.0-1.2.3.255
- localhost - hostname to look up, interpreted as single address
- 1.2.3<->5 - a set of addresses, interpreted as 1.2.3.0-1.2.5.255
- 1.2.0.0/16 - a set of addresses, interpreted as 1.2.0.0-1.2.255.255
Only the first three notations are valid if you use a string address in
a tuple, whereby notation 2 is interpreted as 1.2.3.0 if specified as
lower bound and 1.2.3.255 if specified as upper bound, not as a range
of addresses.
Specifying a range is done with the <-> operator. This is necessary
because '-' might be present in a hostname. '<->' shouldn't be, ever.
"""
# Special case copy constructor.
if len(args) == 1 and isinstance(args[0],IP4Range):
super(IP4Range,self).__init__(args[0])
return
# Convert arguments to tuple syntax.
args = list(args)
for i in range(len(args)):
argval = args[i]
if isinstance(argval,str):
if "<->" in argval:
# Type 4 address.
args[i] = self._parseRange(*argval.split("<->",1))
continue
elif "/" in argval:
# Type 5 address.
args[i] = self._parseMask(*argval.split("/",1))
else:
# Type 1, 2 or 3.
args[i] = self._parseAddrRange(argval)
elif isinstance(argval,tuple):
if len(tuple) != 2:
raise ValueError("Tuple is of invalid length.")
addr1, addr2 = argval
if isinstance(addr1,str):
addr1 = self._parseAddrRange(addr1)[0]
elif not isinstance(addr1, six.integer_types):
raise TypeError("Invalid argument.")
if isinstance(addr2,str):
addr2 = self._parseAddrRange(addr2)[1]
elif not isinstance(addr2, six.integer_types):
raise TypeError("Invalid argument.")
args[i] = (addr1,addr2)
elif not isinstance(argval, six.integer_types):
raise TypeError("Invalid argument.")
# Initialize the integer set.
super(IP4Range,self).__init__(min=self._MINIP4,max=self._MAXIP4,*args)
# Parsing functions
# -----------------
def _parseRange(self,addr1,addr2):
naddr1, naddr1len = _parseAddr(addr1)
naddr2, naddr2len = _parseAddr(addr2)
if naddr2len < naddr1len:
naddr2 += naddr1&(((1<<((naddr1len-naddr2len)*8))-1)<<
(naddr2len*8))
naddr2len = naddr1len
elif naddr2len > naddr1len:
raise ValueError("Range has more dots than address.")
naddr1 <<= (4-naddr1len)*8
naddr2 <<= (4-naddr2len)*8
naddr2 += (1<<((4-naddr2len)*8))-1
return (naddr1,naddr2)
def _parseMask(self,addr,mask):
naddr, naddrlen = _parseAddr(addr)
naddr <<= (4-naddrlen)*8
try:
if not mask:
masklen = 0
else:
masklen = int(mask)
if not 0 <= masklen <= 32:
raise ValueError
except ValueError:
try:
mask = _parseAddr(mask,False)
except ValueError:
raise ValueError("Mask isn't parseable.")
remaining = 0
masklen = 0
if not mask:
masklen = 0
else:
while not (mask&1):
remaining += 1
while (mask&1):
mask >>= 1
masklen += 1
if remaining+masklen != 32:
raise ValueError("Mask isn't a proper host mask.")
naddr1 = naddr & (((1<<masklen)-1)<<(32-masklen))
naddr2 = naddr1 + (1<<(32-masklen)) - 1
return (naddr1,naddr2)
def _parseAddrRange(self,addr):
naddr, naddrlen = _parseAddr(addr)
naddr1 = naddr<<((4-naddrlen)*8)
naddr2 = ( (naddr<<((4-naddrlen)*8)) +
(1<<((4-naddrlen)*8)) - 1 )
return (naddr1,naddr2)
# Utility functions
# -----------------
def _int2ip(self,num):
rv = []
for i in range(4):
rv.append(str(num&255))
num >>= 8
return ".".join(reversed(rv))
# Iterating
# ---------
def iteraddresses(self):
"""Returns an iterator which iterates over ips in this iprange. An
IP is returned in string form (e.g. '1.2.3.4')."""
for v in super(IP4Range,self).__iter__():
yield self._int2ip(v)
def iterranges(self):
"""Returns an iterator which iterates over ip-ip ranges which build
this iprange if combined. An ip-ip pair is returned in string form
(e.g. '1.2.3.4-2.3.4.5')."""
for r in self._ranges:
if r[1]-r[0] == 1:
yield self._int2ip(r[0])
else:
yield '%s-%s' % (self._int2ip(r[0]),self._int2ip(r[1]-1))
def itermasks(self):
"""Returns an iterator which iterates over ip/mask pairs which build
this iprange if combined. An IP/Mask pair is returned in string form
(e.g. '1.2.3.0/24')."""
for r in self._ranges:
for v in self._itermasks(r):
yield v
def _itermasks(self,r):
ranges = [r]
while ranges:
cur = ranges.pop()
curmask = 0
while True:
curmasklen = 1<<(32-curmask)
start = (cur[0]+curmasklen-1)&(((1<<curmask)-1)<<(32-curmask))
if start >= cur[0] and start+curmasklen <= cur[1]:
break
else:
curmask += 1
yield "%s/%s" % (self._int2ip(start),curmask)
if cur[0] < start:
ranges.append((cur[0],start))
if cur[1] > start+curmasklen:
ranges.append((start+curmasklen,cur[1]))
__iter__ = iteraddresses
# Printing
# --------
def __repr__(self):
"""Returns a string which can be used to reconstruct this iprange."""
rv = []
for start, stop in self._ranges:
if stop-start == 1:
rv.append("%r" % (self._int2ip(start),))
else:
rv.append("(%r,%r)" % (self._int2ip(start),
self._int2ip(stop-1)))
return "%s(%s)" % (self.__class__.__name__,",".join(rv))
def _parseAddr(addr,lookup=True):
if lookup and any(ch not in IP4Range._IPREMOVE for ch in addr):
try:
addr = socket.gethostbyname(addr)
except socket.error:
raise ValueError("Invalid Hostname as argument.")
naddr = 0
for naddrpos, part in enumerate(addr.split(".")):
if naddrpos >= 4:
raise ValueError("Address contains more than four parts.")
try:
if not part:
part = 0
else:
part = int(part)
if not 0 <= part < 256:
raise ValueError
except ValueError:
raise ValueError("Address part out of range.")
naddr <<= 8
naddr += part
return naddr, naddrpos+1
def ip2int(addr, lookup=True):
return _parseAddr(addr, lookup=lookup)[0]
if __name__ == "__main__":
# Little test script.
x = IP4Range("172.22.162.250/24")
y = IP4Range("172.22.162.250","172.22.163.250","172.22.163.253<->255")
print(x)
for val in x.itermasks():
print(val)
for val in y.itermasks():
print(val)
for val in (x|y).itermasks():
print(val)
for val in (x^y).iterranges():
print(val)
for val in x:
print(val)
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