termux-samba/scripts/mdns-publish.py

#!/usr/bin/env python3
"""Publica servicios via mDNS/Zeroconf: SSH + Samba"""
import socket
import signal
import sys
from zeroconf import ServiceInfo, Zeroconf, IPVersion

HOSTNAME = 'movil'

SERVICES = [
    {
        'type': '_ssh._tcp.local.',
        'port': 8022,
        'props': {'description': 'Termux SSH'},
    },
    {
        'type': '_smb._tcp.local.',
        'port': 4450,
        'props': {'description': 'Termux Samba', 'path': '/'},
    },
]


def get_local_ip():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(('8.8.8.8', 80))
        ip = s.getsockname()[0]
        s.close()
        return ip
    except Exception:
        return '127.0.0.1'


def main():
    ip = get_local_ip()
    addr = socket.inet_aton(ip)
    zc = Zeroconf(ip_version=IPVersion.V4Only)
    infos = []

    for svc in SERVICES:
        info = ServiceInfo(
            svc['type'],
            f'{HOSTNAME}.{svc["type"]}',
            addresses=[addr],
            port=svc['port'],
            properties=svc['props'],
            server=f'{HOSTNAME}.local.',
        )
        zc.register_service(info)
        infos.append(info)
        print(f'Publicando {HOSTNAME}.local {svc["type"]} -> {ip}:{svc["port"]}')

    def cleanup(sig, frame):
        print('Deteniendo mDNS...')
        for info in infos:
            zc.unregister_service(info)
        zc.close()
        sys.exit(0)

    signal.signal(signal.SIGINT, cleanup)
    signal.signal(signal.SIGTERM, cleanup)

    try:
        signal.pause()
    except AttributeError:
        import time
        while True:
            time.sleep(3600)


if __name__ == '__main__':
    main()