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bind: parse zones files

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Signed-off-by: Nektarios Katakis <iam@nektarioskatakis.xyz>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>
This commit is contained in:
Nektarios Katakis 2020-02-04 14:20:30 +00:00 committed by James Valleroy
parent 4ac8e2c15f
commit 19f9436457
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1 changed files with 84 additions and 0 deletions
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84
plinth/modules/bind/__init__.py
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@ -18,7 +18,10 @@
FreedomBox app to configure BIND server.
"""
import augeas
import re
from collections import defaultdict
from pathlib import Path
from django.utils.translation import ugettext_lazy as _
@ -58,6 +61,7 @@ port_forwarding_info = [
]
CONFIG_FILE = '/etc/bind/named.conf.options'
ZONES_DIR = '/var/bind/pri'
DEFAULT_CONFIG = '''
acl goodclients {
@ -195,3 +199,83 @@ def set_dnssec(choice):
line = '//' + line
conf_file.write(line + '\n')
conf_file.close()
def get_served_domains():
"""
Augeas path for zone files:
===========================
augtool> print /files/var/bind/pri/local.zone
/files/var/bind/pri/local.zone
/files/var/bind/pri/local.zone/$TTL = "604800"
/files/var/bind/pri/local.zone/@[1]
/files/var/bind/pri/local.zone/@[1]/1
/files/var/bind/pri/local.zone/@[1]/1/class = "IN"
/files/var/bind/pri/local.zone/@[1]/1/type = "SOA"
/files/var/bind/pri/local.zone/@[1]/1/mname = "localhost."
/files/var/bind/pri/local.zone/@[1]/1/rname = "root.localhost."
/files/var/bind/pri/local.zone/@[1]/1/serial = "2"
/files/var/bind/pri/local.zone/@[1]/1/refresh = "604800"
/files/var/bind/pri/local.zone/@[1]/1/retry = "86400"
/files/var/bind/pri/local.zone/@[1]/1/expiry = "2419200"
/files/var/bind/pri/local.zone/@[1]/1/minimum = "604800"
/files/var/bind/pri/local.zone/@[2]
/files/var/bind/pri/local.zone/@[2]/1
/files/var/bind/pri/local.zone/@[2]/1/class = "IN"
/files/var/bind/pri/local.zone/@[2]/1/type = "NS"
/files/var/bind/pri/local.zone/@[2]/1/rdata = "localhost."
/files/var/bind/pri/local.zone/@[3]
/files/var/bind/pri/local.zone/@[3]/1
/files/var/bind/pri/local.zone/@[3]/1/class = "IN"
/files/var/bind/pri/local.zone/@[3]/1/type = "A"
/files/var/bind/pri/local.zone/@[3]/1/rdata = "127.0.0.1"
/files/var/bind/pri/local.zone/@[4]
/files/var/bind/pri/local.zone/@[4]/1
/files/var/bind/pri/local.zone/@[4]/1/class = "IN"
/files/var/bind/pri/local.zone/@[4]/1/type = "AAAA"
/files/var/bind/pri/local.zone/@[4]/1/rdata = "::1"
Need to find the related functionality to parse the A records
Retrieve from /etc/bind/db* zone files all the configured A records.
Assuming zones files in ZONES_DIR are all used.
:return: dictionary in the form 'domain_name': ['ip_address', 'ipv6_addr']
"""
RECORD_TYPES = ('A', 'AAAA')
aug = augeas.Augeas(
flags=augeas.Augeas.NO_LOAD + augeas.Augeas.NO_MODL_AUTOLOAD)
aug.set('/augeas/load/Dns_Zone/lens', 'Dns_Zone.lns')
zone_file_path = Path(ZONES_DIR)
zone_files = [zf for zf in zone_file_path.iterdir() if zf.is_file()]
# augeas load only required files
for zone_file in zone_files:
aug.set('/augeas/load/Dns_Zone/incl[last() + 1]', str(zone_file))
aug.load()
served_domains = defaultdict(list)
for zone_file in zone_files:
base_path = '/files/%s/@[{record_order}]/1/{field}' % zone_file
count = 1
mname = aug.get(base_path.format(record_order=count, field='mname'))
while True:
record_type = aug.get(base_path.format(record_order=count,
field='type'))
# no record type ends the search
if record_type is None:
break
if record_type in RECORD_TYPES:
served_domains[mname].append(
aug.get(base_path.format(
record_order=count, field='rdata')
)
)
count += 1
return served_domains