def get_GENERATE_directives(cls, dynamic_range):
"""Return the GENERATE directives for the forward zone of a network."""
slash_16 = IPNetwork("%s/16" % IPAddress(dynamic_range.first))
if dynamic_range.size > 256**2 or not ip_range_within_network(
dynamic_range, slash_16):
# We can't issue a sane set of $GENERATEs for any network
# larger than a /16, or for one that spans two /16s, so we
# don't try.
return []
generate_directives = set()
subnets, prefix, rdns_suffix = get_details_for_ip_range(dynamic_range)
for subnet in subnets:
iterator = "%d-%d" % (
(subnet.first & 0x000000FF),
(subnet.last & 0x000000FF),
)
hostname = "%s-%d-$" % (
prefix.replace(".", "-"),
# Calculate what the third quad (i.e. 10.0.X.1) value should
# be for this subnet.
(subnet.first & 0x0000FF00) >> 8,
)
ip_address = "%s.%d.$" % (prefix, (subnet.first & 0x0000FF00) >> 8)
generate_directives.add((iterator, hostname, ip_address))
return sorted(generate_directives, key=lambda directive: directive[2])
def get_GENERATE_directives(cls, dynamic_range, domain, zone_info):
"""Return the GENERATE directives for the reverse zone of a network."""
slash_16 = IPNetwork("%s/16" % IPAddress(dynamic_range.first))
if dynamic_range.size > 256 ** 2 or not ip_range_within_network(
dynamic_range, slash_16
):
# We can't issue a sane set of $GENERATEs for any network
# larger than a /16, or for one that spans two /16s, so we
# don't try.
return []
generate_directives = set()
# The largest subnet returned is a /24.
subnets, prefix, rdns_suffix = get_details_for_ip_range(dynamic_range)
for subnet in subnets:
if IPAddress(subnet.first) in zone_info.subnetwork:
iterator = "%d-%d" % (
(subnet.first & 0x000000FF),
(subnet.last & 0x000000FF),
)
hostname = "%s-%d-$" % (
prefix.replace(".", "-"),
(subnet.first & 0x0000FF00) >> 8,
)
# If we're at least a /24, then fully specify the name,
# rather than trying to figure out how much of the name
# is in the zone name.
if zone_info.subnetwork.prefixlen <= 24:
rdns = "$.%d.%s" % (
(subnet.first & 0x0000FF00) >> 8,
rdns_suffix,
)
else:
# Let the zone declaration provide the suffix.
# rather than trying to calculate it.
rdns = "$"
generate_directives.add(
(iterator, rdns, "%s.%s." % (hostname, domain))
)
return sorted(generate_directives, key=lambda directive: directive[2])