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#!/usr/bin/python3
# Copyright (c) 2017-2019 David Steele <dsteele@gmail.com>
#
# SPDX-License-Identifier: GPL-2.0-or-later
# License-Filename: LICENSE
#
# Copyright 2016-2017 David Steele <steele@debian.org>
# This file is part of comitup
# Available under the terms of the GNU General Public License version 2
# or later
#
import dbus
import socket
import logging
from comitup import nm
import subprocess
log = logging.getLogger('comitup')
# globals
CLASS_IN = 0x01
TYPE_A = 0x01
TTL = 5
DBUS_NAME = 'org.freedesktop.Avahi'
DBUS_PATH_SERVER = '/'
DBUS_INTERFACE_SERVER = 'org.freedesktop.Avahi.Server'
DBUS_INTERFACE_ENTRY_GROUP = 'org.freedesktop.Avahi.EntryGroup'
PROTO_INET = 0
group = None
# functions
def establish_group():
global group
bus = dbus.SystemBus()
server = dbus.Interface(
bus.get_object(DBUS_NAME, DBUS_PATH_SERVER),
DBUS_INTERFACE_SERVER
)
group = dbus.Interface(
bus.get_object(DBUS_NAME, server.EntryGroupNew()),
DBUS_INTERFACE_ENTRY_GROUP
)
def encode_dns(name):
components = [x for x in name.split('.') if len(x) > 0]
fixed_name = '.'.join(components)
return fixed_name.encode('ascii')
def make_a_record(host, devindex, addr):
group.AddRecord(
devindex,
PROTO_INET,
dbus.UInt32(0),
encode_dns(host),
CLASS_IN,
TYPE_A,
TTL,
socket.inet_aton(addr)
)
def string_to_txt_array(strng):
if strng:
return [dbus.Byte(x) for x in strng.encode()]
else:
return strng
def string_array_to_txt_array(txt_array):
return [string_to_txt_array(x) for x in txt_array]
def add_service(host, devindex, addr):
name = host
if '.local' in name:
name = name[:-len('.local')]
group.AddService(
devindex,
PROTO_INET,
dbus.UInt32(0),
name,
"_workstation._tcp",
"",
host,
dbus.UInt16(9),
string_array_to_txt_array([
"hostname=%s" % host.encode(),
"ipaddr=%s" % addr,
"comitup-home=https://davesteele.github.io/comitup/",
])
)
# public functions
def clear_entries():
if group and not group.IsEmpty():
group.Reset()
establish_group()
def get_interface_mapping():
mapping = {}
for line in subprocess.check_output("ip addr".split()).decode().split('\n'):
try:
asc_index, name = line.split(": ")[0:2]
mapping[name] = int(asc_index)
except ValueError:
pass
return mapping
def add_hosts(hosts):
establish_group()
int_mapping = get_interface_mapping()
for device in nm.get_devices():
name = nm.device_name(device)
addr = nm.get_active_ip(device)
if (name in nm.get_phys_dev_names() \
and name in int_mapping \
and addr):
index = int_mapping[name]
for host in hosts:
make_a_record(host, index, addr)
add_service(hosts[0], index, addr)
group.Commit()
if __name__ == '__main__':
add_hosts(['comitup-1111.local', 'comitup.local'])
while True:
pass
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