Uses LANcache DNS lists to create a DNSmasq compatible config file to redirect DNS queries to an existing LANcache server

lancache.py

## LANcache server IP
cache_ip = '192.168.0.1'

## DNSmasq output file (don't overwrite main config)
## Add "conf-file=/etc/dnsmasq.lancache" to the bottom of /etc/dnsmasq.conf to activate
output_file = '/etc/dnsmasq.lancache'

###
import requests
import os
import datetime

script_path = os.path.abspath(__file__)

with open(output_file, 'w') as out:
    out.write('## This file is automatically generated by ' + script_path + '\n')
    out.write('## Last updated ' + str(datetime.datetime.now()) + '\n')
    out.write('address=/cache/' + cache_ip + '\n')

    repo_info = requests.get('https://raw.githubusercontent.com/uklans/cache-domains/refs/heads/master/cache_domains.json')
    repo_info_json = repo_info.json()
    for domain in repo_info_json['cache_domains']:
        name = str(domain['name'])
        description = str(domain['description'])
        file_list = domain['domain_files']
        dns_list = []
        for fname in file_list:
            if fname == '': continue
            dns_info = requests.get('https://raw.githubusercontent.com/uklans/cache-domains/refs/heads/master/' + fname)
            for line in dns_info.text.split('\n'):
                if line == '': continue
                if line[:1] == '#': continue
                dns_list.append(line)
        
        print('Repository: ' + name)
        print('Description: ' + description)
        print('DNS entries: ' + str(dns_list))
        
        out.write('\n## ' + name + ' - ' + description + '\n')
        for name in dns_list:
            if name[:1] == '*':
                out.write('cname=' + name + ',cache\n')
            else:
                out.write('address=/' + name + '/' + cache_ip + '\n')

DNSMASQ seems to have a bug where an asterisk (*) in a cname does not result in wildcard matching. Currently 'workaround' is to manually specify each subdomain as an 'address' entry, but this is obviously impractical when there are lots of subdomains and/or they change regularly.