diff --git a/src/zeroconf.py b/src/zeroconf.py new file mode 100755 index 000000000..57f596cb8 --- /dev/null +++ b/src/zeroconf.py @@ -0,0 +1,188 @@ +#!/usr/bin/python + +import os, sys + +try: + import avahi, gobject, dbus +except ImportError: + print "Error: python-avahi and python-dbus need to be installed. No zeroconf support." + +try: + import dbus.glib +except ImportError, e: + pass + +service_browsers = {} + +class Zeroconf: + def __init__(self, name): + self.domain = None # specific domain to browse + self.stype = '_presence._tcp' + self.port = 5298 # listening port that gets announced + self.name = name # service name / username + self.txt = {} + + self.contacts = {} # all current local contacts with data + self.entrygroup = '' + + ## handlers for dbus callbacks + + # error handler - maybe replace with gui version/gajim facilities + def print_error_callback(self, err): + print "Error:", str(err) + + def new_service_callback(self, interface, protocol, name, stype, domain, flags): + print "Found service '%s' in domain '%s' on %i.%i." % (name, domain, interface, protocol) + + #synchronous resolving + self.server.ResolveService( int(interface), int(protocol), name, stype, domain, avahi.PROTO_UNSPEC, dbus.UInt32(0), reply_handler=self.service_resolved_callback, error_handler=self.print_error_callback) + + def remove_service_callback(self, interface, protocol, name, stype, domain, flags): + print "Service '%s' in domain '%s' on %i.%i disappeared." % (name, domain, interface, protocol) + del self.contacts[(interface, name, domain)] + + def new_service_type(self, interface, protocol, stype, domain, flags): + global service_browsers + + # Are we already browsing this domain for this type? + if service_browsers.has_key((interface, protocol, stype, domain)): + return + + print "Browsing for services of type '%s' in domain '%s' on %i.%i ..." % (stype, domain, interface, protocol) + + b = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, \ + self.server.ServiceBrowserNew(interface, protocol, \ + stype, domain, dbus.UInt32(0))),avahi.DBUS_INTERFACE_SERVICE_BROWSER) + b.connect_to_signal('ItemNew', self.new_service_callback) + b.connect_to_signal('ItemRemove', self.remove_service_callback) + + service_browsers[(interface, protocol, stype, domain)] = b + + def new_domain_callback(self,interface, protocol, domain, flags): + if domain != "local": + self.browse_domain(interface, protocol, domain) + + def service_resolved_callback(self, interface, protocol, name, stype, domain, host, aprotocol, address, port, txt, flags): + print "Service data for service '%s' in domain '%s' on %i.%i:" % (name, domain, interface, protocol) + print "\tHost %s (%s), port %i, TXT data: %s" % (host, address, port, str(avahi.txt_array_to_string_array(txt))) + + self.contacts[(interface, name, domain)] = (interface, name, protocol, domain, host, address, port, txt) + + + def service_added_callback(self): + print "Service successfully added" + + def service_committed_callback(self): + print "Service successfully committed" + + def service_updated_callback(self): + print "Service successfully updated" + + def service_add_fail_callback(self, err): + print "Error while adding service:", str(err) + self.name = self.server.GetAlternativeServiceName(self.name) + self.create_service() + + def server_state_changed_callback(self, state, error): + print "server.state %s" % state + if state == avahi.SERVER_RUNNING: + self.create_service() + elif state == avahi.SERVER_COLLISION: + self.entrygroup.Reset() +# elif state == avahi.CLIENT_FAILURE: # TODO: add error handling (avahi daemon dies...?) + + def entrygroup_state_changed_callback(self, state, error): + # the name is already present, so ... + if state == avahi.ENTRY_GROUP_COLLISION: + print "Collision with existing service of name %s" % self.name + # ... get a new one and recreate the service + self.name = self.server.GetAlternativeServiceName(self.name) + self.create_service() +# elif state == avahi.ENTRY_GROUP_FAILURE: + + def create_service(self): + if self.entrygroup == '': + # create an EntryGroup for publishing + self.entrygroup = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.EntryGroupNew()), avahi.DBUS_INTERFACE_ENTRY_GROUP) + self.entrygroup.connect_to_signal('StateChanged', self.entrygroup_state_changed_callback) + + self.txt[('port.p2pj')] = self.port + self.txt[('version')] = 1 + self.txt[('textvers')] = 1 + + print "Publishing service '%s' of type %s" % (self.name, self.stype) + self.entrygroup.AddService(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, dbus.UInt32(0), self.name, self.stype, '', '', self.port, avahi.dict_to_txt_array(self.txt), reply_handler=self.service_added_callback, error_handler=self.service_add_fail_callback) + self.entrygroup.Commit(reply_handler=self.service_committed_callback, error_handler=self.print_error_callback) + + def publish(self): + state = self.server.GetState() + + if state == avahi.SERVER_RUNNING: + self.create_service() + + def remove_announce(self): + self.entrygroup.Reset() + self.entrygroup.Free() + + def browse_domain(self, interface, protocol, domain): + self.new_service_type(interface, protocol, self.stype, domain, '') + + # connect to dbus + def connect(self): + self.bus = dbus.SystemBus() + self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, \ + avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER) + + self.server.connect_to_signal('StateChanged', self.server_state_changed_callback) + + # start browsing + if self.domain is None: + # Explicitly browse .local + self.browse_domain(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "local") + + # Browse for other browsable domains + db = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, \ + self.server.DomainBrowserNew(avahi.IF_UNSPEC, \ + avahi.PROTO_UNSPEC, '', avahi.DOMAIN_BROWSER_BROWSE,\ + dbus.UInt32(0))), avahi.DBUS_INTERFACE_DOMAIN_BROWSER) + db.connect_to_signal('ItemNew', self.new_domain_callback) + else: + # Just browse the domain the user wants us to browse + self.browse_domain(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, domain) + +# def disconnect: +# necessary ? + + # refresh data manually - really ok or too much traffic? + def resolve_all(self): + for key in contacts.keys(): + self.server.ResolveService( int(key.interface), int(key.protocol), key.name, \ + self.stype, key.domain, avahi.PROTO_UNSPEC, dbus.UInt32(0),\ + reply_handler=self.service_resolved_callback, error_handler=self.print_error_callback) + + def get_contacts(self): + self.resolve_all + return self.contacts + + def set_status(self, status): + self.txt[('status')] = status + txt = avahi.dict_to_txt_array(self.txt) + + self.entrygroup.UpdateServiceTxt(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, dbus.UInt32(0), self.name, self.stype,'', txt, reply_handler=self.service_updated_callback, error_handler=self.print_error_callback) +# self.entrygroup.Commit() # TODO: necessary? + +def main(): + + zeroconf = Zeroconf('foo') + zeroconf.connect() + zeroconf.txt[('last')] = 'foo' + zeroconf.publish() + zeroconf.set_status('avail') + + try: + gobject.MainLoop().run() + except KeyboardInterrupt, k: + pass + +if __name__ == "__main__": + main()