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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. Returns True/False
"""
# With the below statement we can check for IPv4 networks and host
# addresses at the same time
if ipaddress.ip_address(addr.split(r'/')[0]).version == 4:
return True
else:
return False
def is_ipv6(addr):
"""
Check addr if it is an IPv6 address/network. Returns True/False
"""
# With the below statement we can check for IPv4 networks and host
# addresses at the same time
if ipaddress.ip_network(addr.split(r'/')[0]).version == 6:
return True
else:
return False
def is_intf_addr_assigned(intf, addr):
"""
Verify if the given IPv4/IPv6 address is assigned to specific interface.
It can check both a single IP address (e.g. 192.0.2.1 or a assigned CIDR
address 192.0.2.1/24.
"""
# 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
# check if the requested address type is configured at all
try:
netifaces.ifaddresses(intf)
except ValueError as e:
print(e)
return False
if addr_type in netifaces.ifaddresses(intf).keys():
# Check every IP address on this interface for a match
for ip in netifaces.ifaddresses(intf)[addr_type]:
# Check if it matches to the address requested
# If passed address contains a '/' indicating a normalized IP
# address we have to take this into account, too
if r'/' in addr:
prefixlen = ''
if is_ipv6(addr):
# Note that currently expanded netmasks are not supported. That means
# 2001:db00::0/24 is a valid argument while 2001:db00::0/ffff:ff00:: not.
# see https://docs.python.org/3/library/ipaddress.html
bits = bin( int(ip['netmask'].replace(':',''), 16) ).count('1')
prefixlen = '/' + str(bits)
else:
prefixlen = '/' + str(ipaddress.IPv4Network('0.0.0.0/' + ip['netmask']).prefixlen)
# construct temporary variable holding IPv6 address and netmask
# in CIDR notation
tmp = ip['addr'] + prefixlen
if addr == tmp:
return True
elif ip['addr'] == addr:
return True
return False
def is_addr_assigned(addr):
"""
Verify if the given IPv4/IPv6 address is assigned to any interface
"""
for intf in netifaces.interfaces():
tmp = is_intf_addr_assigned(intf, addr)
if tmp == True:
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, or in other words has a broadcast address configured. ISC DHCP
for instance will complain if it should listen on non broadcast interfaces.
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():
continue
# 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]:
# remove interface extension (e.g. %eth0) that gets thrown on the end of _some_ addrs
addr = ip['addr'].split('%')[0]
if ipaddress.ip_address(addr) in ipaddress.ip_network(subnet):
return True
return False
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