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#Copyright (c) 2011 Erich Schubert erich@debian.org
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#The above copyright notice and this permission notice shall be included in
#all copies or substantial portions of the Software.
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
#SOFTWARE.
import re, inspect, socket
from exception import PyromanException
class Util:
"""
Some utility functions for the firewall system
"""
# regexp used for splitting strings
splitter = re.compile("(?:,\s*|\s+)")
# regexp to ignore lines in manual rules
ignoreline = re.compile("^\s*(#|$)")
# nicknames may only contain these chars
namefilter = re.compile("^[a-zA-Z0-9]+$")
namefilter_service = re.compile("^[a-zA-Z0-9/]+$")
def get_callee(depth=3):
"""
Return information about the calling function
"""
frame = inspect.stack(depth)
return "%s:%d" % (frame[depth-1][1], frame[depth-1][2])
get_callee = staticmethod(get_callee)
def verify_ip4(ip):
"""
Verify that the given string is an IPv4 address
"""
try:
socket.inet_pton(socket.AF_INET, ip)
return True
except socket.error:
return False
verify_ip4 = staticmethod(verify_ip4)
def verify_ip6(ip):
"""
Verify that the given string is an IPv6 address
"""
try:
socket.inet_pton(socket.AF_INET6, ip)
return True
except socket.error:
return False
verify_ip6 = staticmethod(verify_ip6)
def verify_ip4net(ip):
"""
Verify that the given string describes an IPv4 network
"""
l = ip.split("/", 1)
if len(l) == 0:
return False
if not Util.verify_ip4(l[0]):
return False
if len(l) == 1:
return True
n = int(l[1])
return (n >= 0) and (n <= 32)
verify_ip4net = staticmethod(verify_ip4net)
def verify_ip6net(ip):
"""
Verify that the given string describes an IPv6 network
"""
l = ip.split("/", 1)
if len(l) == 0:
return False
if not Util.verify_ip6(l[0]):
return False
if len(l) == 1:
return True
n = int(l[1])
return (n >= 0) and (n <= 128)
verify_ip6net = staticmethod(verify_ip6net)
def verify_ip(ip):
"""
Verify that the given string is an IPv4 or IPv6 address
"""
return Util.verify_ip4(ip) or Util.verify_ip6(ip)
verify_ip = staticmethod(verify_ip)
def verify_ipnet(ip):
"""
Verify that the given string is an IPv4 or IPv6 address
"""
return Util.verify_ip4net(ip) or Util.verify_ip6net(ip)
verify_ipnet = staticmethod(verify_ipnet)
def verify_name(name, servicename=False):
"""
Verify that a name only contains a certain set of characters
to avoid problems with rule names derived from it.
name -- name to be checked
servicename -- Set to true to allow the / char additionally
"""
if servicename:
m = Util.namefilter_service.match(name)
if m:
return True
else:
m = Util.namefilter.match(name)
if m:
return True
return False
verify_name = staticmethod(verify_name)
def compare_versions(ver1, ver2):
"""
Compare to version numbers
returns True if ver1 is less or equal to ver2
ver1 -- first version number
ver2 -- second version number
"""
def compsplit(s):
"""
Split a version number component into a pair of (int,str)
"""
if not s[0].isdigit():
return (None, s)
for i in range(1,len(s)):
if not s[i].isdigit():
return (int(s[:i]),s[i:])
return (int(s),"")
v1c = ver1.split(".")
v2c = ver2.split(".")
minl = min(len(v1c),len(v2c))
for i in range(minl):
(v1, v1s) = compsplit(v1c[i])
(v2, v2s) = compsplit(v2c[i])
# one has digits, one hasn't?
if not v1: return -1
if not v2: return +1
if v1 != v2:
assert(cmp(v1,v2) != 0)
return cmp(v1, v2)
# compare remaining string
c = cmp(v1s,v2s)
if c != 0: return c
if len(v1c) < len(v2c): return -1
if len(v1c) > len(v2c): return +1
return 0
compare_versions = staticmethod(compare_versions)
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