Viewing file:  probe_printer.py (15.82 KB) -rw-r--r--
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## system-config-printer
## Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2014 Red Hat, Inc.
## Copyright (C) 2006 Florian Festi <ffesti@redhat.com>
## Copyright (C) 2007, 2008, 2009, 2014 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 cupshelpers
from debug import *
import errno
import socket, time
from gi.repository import Gdk
from gi.repository import Gtk
from timedops import TimedOperation
import subprocess
import threading
import cups
from gi.repository import GObject
from gi.repository import GLib
import smburi
try:
import pysmb
PYSMB_AVAILABLE=True
except:
PYSMB_AVAILABLE=False
class pysmb:
class AuthContext:
pass
def wordsep (line):
words = []
escaped = False
quoted = False
in_word = False
word = ''
n = len (line)
for i in range (n):
ch = line[i]
if escaped:
word += ch
escaped = False
continue
if ch == '\\':
in_word = True
escaped = True
continue
if in_word:
if quoted:
if ch == '"':
quoted = False
else:
word += ch
elif ch.isspace ():
words.append (word)
word = ''
in_word = False
elif ch == '"':
quoted = True
else:
word += ch
else:
if ch == '"':
in_word = True
quoted = True
elif not ch.isspace ():
in_word = True
word += ch
if word != '':
words.append (word)
return words
### should be ['network', 'foo bar', ' ofoo', '"', '2 3']
##print wordsep ('network "foo bar" \ ofoo "\\"" 2" "3')
def open_socket(hostname, port):
try:
host, port = hostname.split(":", 1)
except ValueError:
host = hostname
s = None
try:
ai = socket.getaddrinfo(host, port, socket.AF_UNSPEC,
socket.SOCK_STREAM)
except (socket.gaierror, socket.error):
ai = []
for res in ai:
af, socktype, proto, canonname, sa = res
try:
s = socket.socket(af, socktype, proto)
s.settimeout(0.5)
except socket.error:
s = None
continue
try:
s.connect(sa)
except socket.error:
s.close()
s = None
continue
break
return s
class LpdServer:
def __init__(self, hostname):
self.hostname = hostname
self.max_lpt_com = 8
self.stop = False
def probe_queue(self,name, result):
s = open_socket(self.hostname, 515)
if not s:
return None
debugprint(name)
try:
s.send(('\2%s\n' % name).encode('UTF-8')) # cmd send job to queue
data = s.recv(1024).decode('UTF-8') # receive status
debugprint(repr(data))
except socket.error as msg:
debugprint(msg)
try:
s.close ()
except:
pass
return False
if len(data)>0 and ord(data[0])==0:
try:
s.send(b'\1\n') # abort job again
s.close ()
except:
pass
result.append(name)
return True
try:
s.close()
except:
pass
return False
def get_possible_queue_names (self):
candidate = ["PASSTHRU", "ps", "lp", "PORT1", ""]
for nr in range (self.max_lpt_com):
candidate.extend (["LPT%d" % nr,
"LPT%d_PASSTHRU" % nr,
"COM%d" % nr,
"COM%d_PASSTHRU" % nr])
for nr in range (50):
candidate.append ("pr%d" % nr)
return candidate
def destroy(self):
debugprint ("LpdServer exiting: destroy called")
self.stop = True
def probe(self):
result = []
for name in self.get_possible_queue_names ():
while Gtk.events_pending ():
Gtk.main_iteration ()
if self.stop:
break
found = self.probe_queue(name, result)
if found is None:
# Couldn't even connect.
break
if not found and name.startswith ("pr"):
break
time.sleep(0.1) # avoid DOS and following counter measures
return result
class BackgroundSmbAuthContext(pysmb.AuthContext):
"""An SMB AuthContext class that is only ever run from
a non-GUI thread."""
def __init__ (self, *args, **kwargs):
self._gui_event = threading.Event ()
pysmb.AuthContext.__init__ (self, *args, **kwargs)
def _do_perform_authentication (self):
Gdk.threads_enter ()
result = pysmb.AuthContext.perform_authentication (self)
Gdk.threads_leave ()
self._do_perform_authentication_result = result
self._gui_event.set ()
def perform_authentication (self):
if (self.passes == 0 or
not self.has_failed or
not self.auth_called or
(self.auth_called and not self.tried_guest)):
# Safe to call the base function. It won't try any UI stuff.
return pysmb.AuthContext.perform_authentication (self)
self._gui_event.clear ()
GLib.timeout_add (1, self._do_perform_authentication)
self._gui_event.wait ()
return self._do_perform_authentication_result
class PrinterFinder:
def __init__ (self):
self.quit = False
def find (self, hostname, callback_fn):
self.hostname = hostname
self.callback_fn = callback_fn
self.op = TimedOperation (self._do_find, callback=lambda x, y: None)
def cancel (self):
self.op.cancel ()
self.quit = True
def _do_find (self):
self._cached_attributes = dict()
for fn in [self._probe_hplip,
self._probe_jetdirect,
self._probe_ipp,
self._probe_snmp,
self._probe_lpd,
self._probe_smb]:
if self.quit:
return
try:
fn ()
except Exception:
nonfatalException ()
# Signal that we've finished.
if not self.quit:
self.callback_fn (None)
def _new_device (self, uri, info, location = None):
device_dict = { 'device-class': 'network',
'device-info': "%s" % info }
if location:
device_dict['device-location']=location
device_dict.update (self._cached_attributes)
new_device = cupshelpers.Device (uri, **device_dict)
debugprint ("Device found: %s" % uri)
self.callback_fn (new_device)
def _probe_snmp (self):
# Run the CUPS SNMP backend, pointing it at the host.
try:
debugprint ("snmp: trying")
p = subprocess.Popen (args=["/usr/lib/cups/backend/snmp",
self.hostname],
close_fds=True,
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL)
except OSError as e:
debugprint ("snmp: no good")
if e.errno == errno.ENOENT:
return
raise
(stdout, stderr) = p.communicate ()
if p.returncode != 0:
debugprint ("snmp: no good (return code %d)" % p.returncode)
return
if self.quit:
debugprint ("snmp: no good")
return
for line in stdout.decode ().split ('\n'):
words = wordsep (line)
n = len (words)
if n == 6:
(device_class, uri, make_and_model,
info, device_id, device_location) = words
elif n == 5:
(device_class, uri, make_and_model, info, device_id) = words
elif n == 4:
(device_class, uri, make_and_model, info) = words
else:
continue
device_dict = { 'device-class': device_class,
'device-make-and-model': make_and_model,
'device-info': info }
if n == 5:
debugprint ("snmp: Device ID found:\n%s" %
device_id)
device_dict['device-id'] = device_id
if n == 6:
device_dict['device-location'] = device_location
device = cupshelpers.Device (uri, **device_dict)
debugprint ("Device found: %s" % uri)
self.callback_fn (device)
# Cache the make and model for use by other search methods
# that are not able to determine it.
self._cached_attributes['device-make-and-model'] = make_and_model
self._cached_attributes['device_id'] = device_id
debugprint ("snmp: done")
def _probe_lpd (self):
debugprint ("lpd: trying")
lpd = LpdServer (self.hostname)
for name in lpd.get_possible_queue_names ():
if self.quit:
debugprint ("lpd: no good")
return
found = lpd.probe_queue (name, [])
if found is None:
# Couldn't even connect.
debugprint ("lpd: couldn't connect")
break
if found:
uri = "lpd://%s/%s" % (self.hostname, name)
self._new_device(uri, self.hostname)
if not found and name.startswith ("pr"):
break
time.sleep(0.1) # avoid DOS and following counter measures
debugprint ("lpd: done")
def _probe_hplip (self):
if ('device-make-and-model' in self._cached_attributes and \
self._cached_attributes['device-make-and-model'] != "Unknown" and \
not self._cached_attributes['device-make-and-model'].lower ().startswith ("hp") and \
not self._cached_attributes['device-make-and-model'].lower ().startswith ("hewlett")):
debugprint ("hplip: no good (Non-HP printer: %s)" %
self._cached_attributes['device-make-and-model'])
return
try:
debugprint ("hplip: trying")
p = subprocess.Popen (args=["hp-makeuri", "-c", self.hostname],
close_fds=True,
stdin=subprocess.DEVNULL,
stdout=subprocess.PIPE,
stderr=subprocess.DEVNULL)
except OSError as e:
if e.errno == errno.ENOENT:
return
raise
(stdout, stderr) = p.communicate ()
if p.returncode != 0:
debugprint ("hplip: no good (return code %d)" % p.returncode)
return
if self.quit:
debugprint ("hplip: no good")
return
uri = stdout.decode ().strip ()
debugprint ("hplip: uri is %s" % uri)
if uri.find (":") != -1:
self._new_device(uri, uri)
debugprint ("hplip: done")
def _probe_smb (self):
if not PYSMB_AVAILABLE:
return
smbc_auth = BackgroundSmbAuthContext ()
debug = 0
if get_debugging ():
debug = 10
ctx = pysmb.smbc.Context (debug=debug,
auth_fn=smbc_auth.callback)
entries = []
uri = "smb://%s/" % self.hostname
debugprint ("smb: trying")
try:
while smbc_auth.perform_authentication () > 0:
if self.quit:
debugprint ("smb: no good")
return
try:
entries = ctx.opendir (uri).getdents ()
except Exception as e:
smbc_auth.failed (e)
except RuntimeError as e:
(e, s) = e.args
if e not in [errno.ENOENT, errno.EACCES, errno.EPERM]:
debugprint ("Runtime error: %s" % repr ((e, s)))
except:
nonfatalException ()
if self.quit:
debugprint ("smb: no good")
return
for entry in entries:
if entry.smbc_type == pysmb.smbc.PRINTER_SHARE:
uri = "smb://%s/%s" % (smburi.urlquote (self.hostname),
smburi.urlquote (entry.name))
info = "SMB (%s)" % self.hostname
self._new_device(uri, info)
debugprint ("smb: done")
def _probe_jetdirect (self):
port = 9100 #jetdirect
sock_address = (self.hostname, port)
debugprint ("jetdirect: trying")
s = open_socket(self.hostname, port)
if not s:
debugprint ("jetdirect: %s:%d CLOSED" % sock_address)
else:
# port is open so assume its a JetDirect device
debugprint ("jetdirect %s:%d OPEN" % sock_address)
uri = "socket://%s:%d" % sock_address
info = "JetDirect (%s)" % self.hostname
self._new_device(uri, info)
s.close ()
debugprint ("jetdirect: done")
def _probe_ipp (self):
debugprint ("ipp: trying")
try:
ai = socket.getaddrinfo(self.hostname, 631, socket.AF_UNSPEC,
socket.SOCK_STREAM)
except socket.gaierror:
debugprint ("ipp: can't resolve %s" % self.hostname)
debugprint ("ipp: no good")
return
for res in ai:
af, socktype, proto, canonname, sa = res
if (af == socket.AF_INET and sa[0] == '127.0.0.1' or
af == socket.AF_INET6 and sa[0] == '::1'):
debugprint ("ipp: do not probe local cups server")
debugprint ("ipp: no good")
return
try:
c = cups.Connection (host = self.hostname)
except RuntimeError:
debugprint ("ipp: can't connect to server/printer")
debugprint ("ipp: no good")
return
try:
printers = c.getPrinters ()
except cups.IPPError:
debugprint ("%s is probably not a cups server but IPP printer" %
self.hostname)
uri = "ipp://%s:631/ipp" % (self.hostname)
info = "IPP (%s)" % self.hostname
self._new_device(uri, info)
debugprint ("ipp: done")
return
for name, queue in printers.items ():
uri = queue['printer-uri-supported']
info = queue['printer-info']
location = queue['printer-location']
self._new_device(uri, info, location)
debugprint ("ipp: done")
if __name__ == '__main__':
import sys
if len (sys.argv) < 2:
print("Need printer address")
sys.exit (1)
set_debugging (True)
loop = GObject.MainLoop ()
def display (device):
if device is None:
loop.quit ()
addr = sys.argv[1]
p = PrinterFinder ()
p.find (addr, display)
loop.run ()
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