diff options
| -rw-r--r-- | python/vyos/validate.py | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/python/vyos/validate.py b/python/vyos/validate.py index 549812371..b681edc5e 100644 --- a/python/vyos/validate.py +++ b/python/vyos/validate.py @@ -40,7 +40,8 @@ def is_ipv6(addr): def is_addr_assigned(addr): """ - Verify if the given IPv4/IPv6 address is assigned to any interface on this system + Verify if the given IPv4/IPv6 address is assigned to any interface on this + system. Return True/False """ @@ -61,3 +62,38 @@ def is_addr_assigned(addr): 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 |