def build(self, transaction=None, **kwargs):
# dummy empty return value
response_string_part = ''
options_answer_part = None
# http://tools.ietf.org/html/rfc4704#page-5
# regarding RFC 4704 5. there are 3 kinds of client behaviour for N O S:
# - client wants to update DNS itself -> sends 0 0 0
# - client wants server to update DNS -> sends 0 0 1
# - client wants no server DNS update -> sends 1 0 0
if transaction.client:
# flags for answer
n, o, s = 0, 0, 0
# use hostname supplied by client
if cfg.DNS_USE_CLIENT_HOSTNAME:
hostname = transaction.hostname
# use hostname from config
else:
hostname = transaction.client.hostname
if not hostname == '':
if cfg.DNS_UPDATE == 1:
# DNS update done by server - don't care what client wants
if cfg.DNS_IGNORE_CLIENT:
s = 1
o = 1
else:
# honor the client's request for the server to initiate DNS updates
if transaction.dns_s == 1:
s = 1
# honor the client's request for no server-initiated DNS update
elif transaction.dns_n == 1:
n = 1
else:
# no DNS update at all, not for server and not for client
if transaction.dns_n == 1 or \
transaction.dns_s == 1:
o = 1
# sum of flags
nos_flags = n * 4 + o * 2 + s * 1
fqdn_binary = convert_dns_to_binary(f'{hostname}.{cfg.DOMAIN}')
response_string_part = self.convert_to_string(
self.number, f'{nos_flags:02x}{fqdn_binary}')
else:
# if no hostname given put something in and force client override
fqdn_binary = convert_dns_to_binary(
'invalid-hostname.{cfg.DOMAIN}')
response_string_part = self.convert_to_string(
self.number, f'{3:02x}{fqdn_binary}')
# options in answer to be logged
options_answer_part = self.number
return response_string_part, options_answer_part
def build(self, **kwargs):
converted_domain_search_list = ''
for d in cfg.DOMAIN_SEARCH_LIST:
converted_domain_search_list += convert_dns_to_binary(d)
response_string_part = self.convert_to_string(
self.number, converted_domain_search_list)
return response_string_part, self.number
def build(self, **kwargs):
# dummy empty defaults
response_string_part = ''
options_answer_part = None
ntp_server_options = ''
if len(cfg.NTP_SERVER) > 0:
for ntp_server_type in list(cfg.NTP_SERVER_DICT.keys()):
# ntp_server_suboption
for ntp_server in cfg.NTP_SERVER_DICT[ntp_server_type]:
ntp_server_suboption = ''
if ntp_server_type == 'SRV':
ntp_server_suboption = self.convert_to_string(
1,
hexlify(inet_pton(AF_INET6, ntp_server)).decode())
elif ntp_server_type == 'MC':
ntp_server_suboption = self.convert_to_string(
2,
hexlify(inet_pton(AF_INET6, ntp_server)).decode())
elif ntp_server_type == 'FQDN':
ntp_server_suboption = self.convert_to_string(
3, convert_dns_to_binary(ntp_server))
ntp_server_options += ntp_server_suboption
response_string_part = self.convert_to_string(
self.number, ntp_server_options)
# options in answer to be logged
options_answer_part = self.number
return response_string_part, options_answer_part