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#!/usr/bin/env python
# Copyright 2014 Tobias Mueller <muelli@cryptobitch.de>
# Copyright 2014 Andrei Macavei <andrei.macavei89@gmail.com>
# Copyright 2015 Jody Hansen <jobediah.hansen@gmail.com>
#
# This file is part of GNOME Keysign.
#
# GNOME Keysign is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GNOME Keysign is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNOME Keysign. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function
import logging
import os
import dbus
from dbus.mainloop.glib import DBusGMainLoop
from gi.repository import GObject
if __name__ == "__main__" and __package__ is None:
logging.getLogger().error("You seem to be trying to execute " +
"this script directly which is discouraged. " +
"Try python -m instead.")
parent_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
os.sys.path.insert(0, parent_dir)
os.sys.path.insert(0, os.path.join(parent_dir, 'monkeysign'))
__package__ = str('keysign')
from .AvahiConstants import AvahiConstants as avahi
from ..errors import NoAvahiDbus
__all__ = ["AvahiBrowser"]
DBusGMainLoop( set_as_default=True )
log = logging.getLogger(__name__)
# This should probably be upstreamed.
# Unfortunately, upstream seems rather inactive.
if getattr(avahi, 'txt_array_to_dict', None) is None:
# This has been taken from Gajim
# https://dev.gajim.org/gajim/gajim/blob/2d6e7d2e/gajim/common/zeroconf/zeroconf_avahi.py#L131
# it is licensed under the GPLv3.
# https://github.com/lathiat/avahi/pull/133
def txt_array_to_dict(txt_array):
txt_dict = {}
for els in txt_array:
key, val = '', None
for c in els:
c = chr(c)
if val is None:
if c == '=':
val = ''
else:
key += c
else:
val += c
if val is None: # missing '='
val = ''
txt_dict[key] = val
return txt_dict
setattr(avahi, 'txt_array_to_dict', txt_array_to_dict)
class AvahiBrowser(GObject.GObject):
__gsignals__ = {
str('new_service'): (GObject.SignalFlags.RUN_LAST, None,
# name, address (could be an int too (for IPv4)), port, txt_dict
(str, str, int, object)),
str('remove_service'): (GObject.SignalFlags.RUN_LAST, None,
# string 'remove'(placeholder: tuple element must be sequence), name
(str, str)),
}
def __init__(self, loop=None, service='_gnome-keysign._tcp'):
GObject.GObject.__init__(self)
self.log = logging.getLogger(__name__)
self.service = service
# It seems that these are different loops..?!
self.loop = loop or DBusGMainLoop()
self.bus = dbus.SystemBus(mainloop=self.loop)
try:
self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, '/'),
'org.freedesktop.Avahi.Server')
except dbus.exceptions.DBusException as de:
log.exception("Avahi cannot be started: %s", de)
raise NoAvahiDbus(de)
self.sbrowser = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME,
self.server.ServiceBrowserNew(avahi.IF_UNSPEC,
avahi.PROTO_UNSPEC, self.service, 'local', dbus.UInt32(0))),
avahi.DBUS_INTERFACE_SERVICE_BROWSER)
self.sbrowser.connect_to_signal("ItemNew", self.on_new_item)
self.sbrowser.connect_to_signal("ItemRemove", self.on_service_removed)
def on_new_item(self, interface, protocol, name, stype, domain, flags):
self.log.info("Found service '%s' type '%s' domain '%s' ", name, stype, domain)
if flags & avahi.LOOKUP_RESULT_LOCAL:
# FIXME skip local services
pass
self.server.ResolveService(interface, protocol, name, stype,
domain, avahi.PROTO_UNSPEC, dbus.UInt32(0),
reply_handler=self.on_service_resolved,
error_handler=self.on_error)
def on_service_resolved(self, interface, protocol, name, stype, domain,
host, aprotocol, address, port, txt, flags):
'''called when the browser successfully found a service'''
txt = avahi.txt_array_to_dict(txt)
self.log.info("Service resolved; name: '%s', address: '%s',"
"port: '%s', and txt: '%s'", name, address, port, txt)
retval = self.emit('new_service', name, address, port, txt)
self.log.info("emitted '%s'", retval)
def on_service_removed(self, interface, protocol, name, stype, domain, flags):
'''Emits items to be removed from list of discovered services.'''
self.log.info("Service removed; name: '%s'", name)
retval = self.emit('remove_service', 'remove', name)
self.log.info("emitted '%s'", retval)
def on_error(self, *args):
print('error_handler')
print(args[0])
def main():
loop = GObject.MainLoop()
# We're not passing the loop to DBus, because... well, it
# does't work... It seems to expect a DBusMainLoop, not
# an ordinary main loop...
ab = AvahiBrowser()
def print_signal(*args):
print("Signal ahoi", args)
ab.connect('new_service', print_signal)
ab.connect('remove_service', print_signal)
loop.run()
if __name__ == "__main__":
main()
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