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#!/usr/bin/python
# network_utils.py Network utility
# Copyright (C) 2014 Red Hat Inc
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
import re
import socket
import ethtool
import logging
IPADDR_RE = re.compile(r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')
DOMAIN_RE = re.compile(
flags=re.VERBOSE,
pattern=r"""
^
[\w\.\-\_]+
\w+
$
"""
)
def getNonLoopbackAddresses():
devices = ethtool.get_active_devices()
iplist = []
for device in devices:
try:
flags = ethtool.get_flags(device)
if flags and not (flags & ethtool.IFF_LOOPBACK):
iplist.append(ethtool.get_ipaddr(device))
except IOError as e:
logging.error("unable to get ipaddr/flags for %s: %s"
% (device, e))
return set(iplist)
def validateFQDNresolvability(fqdn):
try:
resolvedAddresses = set(socket.gethostbyname_ex(fqdn)[2])
except socket.error:
return "%s did not resolve into an IP address" % fqdn
if not resolvedAddresses.issubset(getNonLoopbackAddresses()):
return "The following addreses: '%s' can't be mapped to non " \
"loopback devices on this host" % resolvedAddresses
def validateHostAddress(address):
if not address:
return "Please specify host Address"
if IPADDR_RE.match(address):
if not address in getNonLoopbackAddresses():
return "Address '%s' can't be mapped to non loopback devices " \
"on this host" % address
else:
return
if len(address) > 1000:
return "FQDN has invalid length"
components = address.split('.', 1)
if len(components) < 2:
return "Host FQDN name '%s' has no domain suffix" % address
else:
if not DOMAIN_RE.match(components[1]):
return "Host FQDN name '%s' has invalid domain name" % address
return validateFQDNresolvability(address)
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