Kapisi/bin/generate-pihole-dns-dhcp.py

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#!/usr/bin/env python3
# File: generate-pihole-dns-dhcp.py
#
# Description: This file generates the DNS and DHCP files for pihole.
#
# Package: AniNIX/Ubiqtorate
# Copyright: WTFPL
#
# Author: DarkFeather <darkfeather@aninix.net>
import os
import subprocess
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import sys
import yaml
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rolepath='../roles/Nazara/files'
dnsfilepath=rolepath+"/dns"
dhcpfilepath=rolepath+"/dhcp"
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def WriteDHCPEntry(content,hosttype,hostclass):
### Create the DHCP entry
# param content: the yaml content to parse
# param hosttype: managed or unmanaged
# param hostclass: the type of host as classified in the yaml
global dhcpfile
with open(dhcpfilepath,'a') as dhcpfile:
for host in content['all']['children'][hosttype]['children'][hostclass]['hosts']:
try:
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dhcpfile.write('dhcp-host=' + content['all']['children'][hosttype]['children'][hostclass]['hosts'][host]['mac'] + ',' + content['all']['children'][hosttype]['children'][hostclass]['hosts'][host]['ip'] + ',' + host + '.' + content['all']['vars']['replica_domain'] + '\n')
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except:
print(host + ' is not complete for DHCP.')
def WriteDNSEntry(content,hosttype,hostclass):
### Create the DNS entry
# param content: the yaml content to parse
# param hosttype: managed or unmanaged
# param hostclass: the type of host as classified in the yaml
global dnsfile
with open(dnsfilepath,'a') as dnsfile:
# Write host entries
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for host in content['all']['children'][hosttype]['children'][hostclass]['hosts']:
try:
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dnsfile.write(content['all']['children'][hosttype]['children'][hostclass]['hosts'][host]['ip'] + ' ' + host + '.' + content['all']['vars']['replica_domain'] + ' ' + host + '\n')
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except:
print(host + ' is not complete for DNS.')
def GenerateFiles(file):
### Open the file and parse it
# param file: the file to work on
global dnsfile
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if not os.path.isdir(rolepath):
os.mkdir(rolepath)
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# Parse the yaml
with open(file, 'r') as stream:
content = yaml.safe_load(stream)
# Clear the DNS file
with open(dhcpfilepath,'w') as dhcpfile:
dhcpfile.write('dhcp-range='+content['all']['vars']['dhcprange']+'\n')
dhcpfile.write('dhcp-option=option:dns-server,'+content['all']['vars']['dns']+'\n\n')
dhcpfile.write('dhcp-range='+content['all']['vars']['staticrange']+'\n')
with open(dnsfilepath,'w') as dnsfile:
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vips=subprocess.run(["/bin/bash", "-c", "echo | openssl s_client -connect "+content['all']['vars']['external_domain']+":443 | openssl x509 -text -noout | grep DNS: | tr ',' '\n' | sed 's/\s\+DNS://' | grep -ivE ^"+content['all']['vars']['external_domain']+" | tr '\n' ' '"], capture_output=True).stdout.decode("utf-8")
dnsfile.write(content['all']['vars']['webfront']+' '+content['all']['vars']['external_domain']+' '+vips+"\n")
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# Add DNS entries for each host
hosttype = 'managed'
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for hostclass in ['physical','virtual','geth_hubs']:
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WriteDNSEntry(content,hosttype,hostclass)
WriteDHCPEntry(content,hosttype,hostclass)
hosttype = 'unmanaged'
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for hostclass in ['ovas','appliances','iot']:
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WriteDNSEntry(content,hosttype,hostclass)
WriteDHCPEntry(content,hosttype,hostclass)
if __name__ == '__main__':
if len(sys.argv) != 2:
print("You need to supply an inventory file.")
sys.exit(1)
GenerateFiles(sys.argv[1])
sys.exit(0)