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# Copyright 2018 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import netifaces
import ipaddress
def is_ipv4(addr):
"""
Check addr if it is an IPv4 address/network.
Return True/False
"""
if ipaddress.ip_network(addr).version == 4:
return True
else:
return False
def is_ipv6(addr):
"""
Check addr if it is an IPv6 address/network.
Return True/False
"""
if ipaddress.ip_network(addr).version == 6:
return True
else:
return False
def is_addr_assigned(addr):
"""
Verify if the given IPv4/IPv6 address is assigned to any interface on this system
Return True/False
"""
# determine IP version (AF_INET or AF_INET6) depending on passed address
addr_type = netifaces.AF_INET
if is_ipv6(addr):
addr_type = netifaces.AF_INET6
for interface in netifaces.interfaces():
# check if the requested address type is configured at all
if addr_type in netifaces.ifaddresses(interface).keys():
# Check every IP address on this interface for a match
for ip in netifaces.ifaddresses(interface)[addr_type]:
# Check if it matches to the address requested
if ip['addr'] == addr:
return True
return False
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