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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
def is_subnet_connected(subnet, primary=False):
"""
Verify is the given IPv4/IPv6 subnet is connected to any interface on this
system.
primary check if the subnet is reachable via the primary IP address of this
interface. E.g. ISC DHCP can only listen on primary addresses.
Return True/False
"""
# determine IP version (AF_INET or AF_INET6) depending on passed address
addr_type = netifaces.AF_INET
if is_ipv6(subnet):
addr_type = netifaces.AF_INET6
for interface in netifaces.interfaces():
# check if the requested address type is configured at all
if addr_type not in netifaces.ifaddresses(interface).keys():
return False
# An interface can have multiple addresses, but some software components
# only support the primary address :(
if primary:
ip = netifaces.ifaddresses(interface)[addr_type][0]['addr']
if ipaddress.ip_address(ip) in ipaddress.ip_network(subnet):
return True
else:
# Check every assigned IP address if it is connected to the subnet
# in question
for ip in netifaces.ifaddresses(interface)[addr_type]:
if ipaddress.ip_address(ip['addr']) in ipaddress.ip_network(subnet):
return True
return False
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