Limnoria/src/utils/net.py

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###
# Copyright (c) 2002-2005, Jeremiah Fincher
# Copyright (c) 2011, James Vega
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# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
"""
Simple utility modules.
"""
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import re
import socket
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emailRe = re.compile(r"^(\w&.+-]+!)*[\w&.+-]+@"
r"(([0-9a-z]([0-9a-z-]*[0-9a-z])?\.)[a-z]{2,6}|"
r"([0-9]{1,3}\.){3}[0-9]{1,3})$", re.I)
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def getSocket(host):
"""Returns a socket of the correct AF_INET type (v4 or v6) in order to
communicate with host.
"""
addrinfo = socket.getaddrinfo(host, None)
host = addrinfo[0][4][0]
if isIPV4(host):
return socket.socket(socket.AF_INET, socket.SOCK_STREAM)
elif isIPV6(host):
return socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
else:
raise socket.error, 'Something wonky happened.'
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def isIP(s):
"""Returns whether or not a given string is an IP address.
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>>> isIP('255.255.255.255')
1
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>>> isIP('::1')
0
"""
return isIPV4(s) or isIPV6(s)
def isIPV4(s):
"""Returns whether or not a given string is an IPV4 address.
>>> isIPV4('255.255.255.255')
1
>>> isIPV4('abc.abc.abc.abc')
0
"""
try:
return bool(socket.inet_aton(s))
except socket.error:
return False
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def bruteIsIPV6(s):
if s.count('::') <= 1:
L = s.split(':')
if len(L) <= 8:
for x in L:
if x:
try:
int(x, 16)
except ValueError:
return False
return True
return False
def isIPV6(s):
"""Returns whether or not a given string is an IPV6 address."""
try:
if hasattr(socket, 'inet_pton'):
return bool(socket.inet_pton(socket.AF_INET6, s))
else:
return bruteIsIPV6(s)
except socket.error:
try:
socket.inet_pton(socket.AF_INET6, '::')
except socket.error:
# We gotta fake it.
return bruteIsIPV6(s)
return False
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