/usr/share/system-config-printer/dnssdresolve.py is in system-config-printer-common 1.3.8+20120201-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | #!/usr/bin/python
## Copyright (C) 2010, 2011 Red Hat, Inc.
## Authors:
## Tim Waugh <twaugh@redhat.com>
## This program 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 2 of the License, or
## (at your option) any later version.
## This program 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 this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
import dbus, re
from debug import *
class DNSSDHostNamesResolver:
def __init__ (self, devices):
self._devices = devices
self._unresolved = len (devices)
self._device_uri_by_name = {}
debugprint ("+%s" % self)
def __del__ (self):
debugprint ("-%s" % self)
def resolve (self, reply_handler):
def expandhex (searchres):
expr = searchres.group(0)
return chr(int(expr[1:], 16))
self._reply_handler = reply_handler
bus = dbus.SystemBus ()
if not bus:
reply_handler ([])
del self._devices
del self._reply_handler
return
for uri, device in self._devices.iteritems ():
if not uri.startswith ("dnssd://"):
self._unresolved -= 1
continue
# We need to resolve the DNS-SD hostname in order to
# compare with other network devices.
p = uri[8:].find ("/")
if p == -1:
hostname = uri[8:]
else:
hostname = uri[8:8+p]
hostname = hostname.encode('utf-8')
hostname = re.sub("%(?i)[\dabcdef]{2}", expandhex, hostname)
elements = hostname.rsplit (".", 3)
if len (elements) != 4:
self._resolved ()
continue
name, stype, protocol, domain = elements
stype += "." + protocol # e.g. _printer._tcp
try:
obj = bus.get_object ("org.freedesktop.Avahi", "/")
server = dbus.Interface (obj,
"org.freedesktop.Avahi.Server")
self._device_uri_by_name[(name, stype, domain)] = uri
debugprint ("Resolving address for %s" % hostname)
server.ResolveService (-1, -1,
name, stype, domain,
-1, 0,
reply_handler=self._reply,
error_handler=lambda e:
self._error (uri, e))
except dbus.DBusException, e:
debugprint ("Failed to resolve address: %s" % e)
self._resolved ()
def _resolved (self):
self._unresolved -= 1
if self._unresolved == 0:
debugprint ("All addresses resolved")
self._reply_handler (self._devices)
del self._devices
del self._reply_handler
def _reply (self, interface, protocol, name, stype, domain,
host, aprotocol, address, port, txt, flags):
uri = self._device_uri_by_name[(name.encode ('utf-8'), stype, domain)]
self._devices[uri].address = address
hostname = host
p = hostname.find(".")
if p != -1:
hostname = hostname[:p]
debugprint ("%s is at %s (%s)" % (uri, address, hostname))
self._devices[uri].hostname = hostname
self._resolved ()
def _error (self, uri, error):
debugprint ("Error resolving %s: %s" % (uri, error))
self._resolved ()
if __name__ == '__main__':
class Device:
def __repr__ (self):
try:
return "<Device @ %s>" % self.address
except:
return "<Device>"
devices = {"dnssd://dlk-08E206-P1._printer._tcp.local/": Device(),
"dnssd://foo._printer._tcp.local/": Device()}
from dbus.glib import DBusGMainLoop
DBusGMainLoop (set_as_default=True)
class Test:
def __init__ (self, loop, devices):
self._loop = loop
self._devices = devices
def run (self):
r = DNSSDHostNamesResolver (self._devices)
r.resolve (reply_handler=self.reply)
return False
def reply (self, *args):
print args
self._loop.quit ()
import gobject
loop = gobject.MainLoop ()
set_debugging (True)
gobject.idle_add (Test (loop, devices).run)
loop.run ()
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