def validate_address(ip_address, network):
"""Determine whether an address is valid."""
if ip_address.version != network.version:
msg = ("Invalid IP version - must match network version " +
ip_version_to_string(network.version))
raise ValidateFail(msg)
elif ip_address == network:
raise ValidateFail("Cannot use network address")
elif ip_address == network.broadcast:
raise ValidateFail("Cannot use broadcast address")
elif ip_address not in network:
raise ValidateFail("Address must be in subnet %s" % str(network))
def validate_nameserver_address_str(ip_address_str, subnet_version=None):
"""Determine whether a nameserver address is valid."""
try:
ip_address = netaddr.IPAddress(ip_address_str)
if subnet_version is not None and ip_address.version != subnet_version:
msg = ("Invalid IP version - must match OAM subnet version " +
ip_version_to_string(subnet_version))
raise ValidateFail(msg)
return ip_address
except netaddr.AddrFormatError:
msg = "Invalid address - not a valid %s address" % \
ip_version_to_string(subnet_version)
raise ValidateFail(msg)
def check_network_overlap(new_network, configured_networks):
""" Validate that new_network does not overlap any configured_networks.
"""
if any(new_network.ip in subnet for subnet in
configured_networks):
raise ValidateFail(
"Subnet %s overlaps with another configured subnet" % new_network)
def validate_address_str(ip_address_str, network):
"""Determine whether an address is valid."""
try:
ip_address = netaddr.IPAddress(ip_address_str)
if ip_address.version != network.version:
msg = ("Invalid IP version - must match network version " +
ip_version_to_string(network.version))
raise ValidateFail(msg)
elif ip_address == network:
raise ValidateFail("Cannot use network address")
elif ip_address == network.broadcast:
raise ValidateFail("Cannot use broadcast address")
elif ip_address not in network:
raise ValidateFail("Address must be in subnet %s" % str(network))
return ip_address
except netaddr.AddrFormatError:
raise ValidateFail("Invalid address - not a valid IP address")
def get_service(conf, section, key):
if key in EXPECTED_SERVICE_NAME_AND_TYPE:
if conf.has_option(section, key):
value = conf.get(section, key)
if value != EXPECTED_SERVICE_NAME_AND_TYPE[key]:
raise ValidateFail("Unsupported %s: %s " % (key, value))
else:
value = EXPECTED_SERVICE_NAME_AND_TYPE[key]
return value
else:
return conf.get(section, key)
def validate_network_str(network_str, minimum_size,
existing_networks=None, multicast=False):
"""Determine whether a network is valid."""
try:
network = netaddr.IPNetwork(network_str)
if network.size < minimum_size:
raise ValidateFail("Subnet too small - must have at least %d "
"addresses" % minimum_size)
elif network.version == 6 and network.prefixlen < 64:
raise ValidateFail("IPv6 minimum prefix length is 64")
elif existing_networks:
if any(network.ip in subnet for subnet in existing_networks):
raise ValidateFail("Subnet overlaps with another "
"configured subnet")
elif multicast and not network.is_multicast():
raise ValidateFail("Invalid subnet - must be multicast")
return network
except netaddr.AddrFormatError:
raise ValidateFail(
"Invalid subnet - not a valid IP subnet")