Browse OpenStack mDNS records

browse-mdns.py

#!/usr/bin/env python

from __future__ import print_function

import socket
import sys

import netifaces
import zeroconf


def log(_msg, *_args):
    print('=', _msg % _args, file=sys.stderr)


def process_interface(stype, iface, addr):
    zc = zeroconf.Zeroconf(interfaces=[addr])
    try:
        sinfo = zc.get_service_info(stype, stype)
    finally:
        zc.close()

    if sinfo:
        log("Found %s on %s (%s)", stype, iface, addr)
        converted = socket.inet_ntoa(sinfo.address)
        print(sinfo.type, '%s:%s' % (converted, sinfo.port), sinfo.properties)
    else:
        log("No %s exposed on %s", stype, iface)


if __name__ == '__main__':
    try:
        stype = sys.argv[1]
    except IndexError:
        sys.exit("Usage: %s (baremetal|baremetal-introspection)" % sys.argv[0])

    stype = '%s._openstack._tcp.local.' % stype
    for iface in netifaces.interfaces():
        addrs = netifaces.ifaddresses(iface)
        try:
            addr = addrs[netifaces.AF_INET][0]['addr']
        except KeyError:
            log("No IPv4 addresses for interface %s", iface)
            continue

        process_interface(stype, iface, addr)