/usr/lib/cups/backend/xpraforwarder is in xpra 0.15.8+dfsg-1.
This file is owned by root:root, with mode 0o755.
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 | #!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# xpraforwarder - A CUPS backend written in Python.
# Forwards the print job via xpra.
#
# It is based on pdf2email by Georde Notaras.
#
# Copyright (c) George Notaras <George [D.O.T.] Notaras [A.T.] gmail [D.O.T.] com>
# Copyright (C) 2014, 2015 Antoine Martin <antoine@devloop.org.uk>
#
# License: GPLv2
#
# This program is released with absolutely no warranty, expressed or implied,
# and absolutely no support.
#
# 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.,
# 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
import sys, os, syslog
import subprocess, traceback
import urlparse
__version__ = "0.15.0"
#Writes a syslog entry (msg) at the default facility:
def debug(msg):
syslog.syslog(syslog.LOG_DEBUG, msg)
def info(msg):
syslog.syslog(syslog.LOG_INFO, msg)
def err(msg):
syslog.syslog(syslog.LOG_ERR, msg)
def exec_command(command, env=os.environ.copy(), shell=True):
info("running: %s" % command)
PIPE = subprocess.PIPE
proc = subprocess.Popen(command, stdin=None, stdout=PIPE, stderr=PIPE, env=env, shell=shell)
out,err = proc.communicate()
info("returncode(%s)=%s" % (command, proc.returncode))
info("stdout=%s" % out)
info("stderr=%s" % err)
return proc.returncode
def xpra_print(socket_dir, display, filename, mimetype, source, title, printer, no_copies, print_options):
command = ["xpra", "--socket-dir=%s" % socket_dir, "print", display, filename, mimetype, source, title, printer, no_copies, print_options]
#in this case, running as root cannot be avoided, so skip the warning:
#(using "su" causes even more problems)
env = os.environ.copy()
env["XPRA_NO_ROOT_WARNING"] = "1"
return exec_command(command, env=env, shell=False)
def do_main():
info(" ".join(["'%s'" % x for x in sys.argv]))
if len(sys.argv) == 1:
# Without arguments should give backend info.
# This is also used when lpinfo -v is issued, where it should include "direct this_backend"
sys.stdout.write("direct %s \"Unknown\" \"Direct PDF Printing/Forwarding to host via xpra\"\n" % os.path.basename(sys.argv[0]))
sys.stdout.flush()
sys.exit(0)
if len(sys.argv) not in (6,7):
sys.stdout.write("Usage: %s job-id user title copies options [file]\n" % os.path.basename(sys.argv[0]))
sys.stdout.flush()
err("Wrong number of arguments. Usage: %s job-id user title copies options [file]" % sys.argv[0])
sys.exit(1)
job_id, username, title, no_copies, print_options = sys.argv[1:6]
if len(sys.argv)==7:
filename = sys.argv[6]
else:
filename = "-"
info("username: %s, title: %s, filename: %s, job_id: %s" % (username, title, filename, job_id))
dev_uri = os.environ['DEVICE_URI']
parsed_url = urlparse.urlparse(dev_uri)
info("urlparse(%s)=%s" % (dev_uri, parsed_url))
#write_dir = parsed_url.path
attributes = urlparse.parse_qs(parsed_url.query)
info("attributes(%s)=%s" % (parsed_url.query, attributes))
def aget(k, default_value):
v = attributes.get(k)
if v is None:
return default_value
assert len(v)==1
return v[0]
display = aget("display", os.environ.get("DISPLAY"))
socket_dir = aget("socket-dir", "/tmp")
printer = aget("remote-printer", "")
source = aget("source", "")
if not source:
raise Exception("Device URI: client source uuid is missing")
if not display:
raise Exception("Device URI: display number not specified!")
info("xpra display: %s" % display)
xpra_print(socket_dir, display, filename, "application/postscript", source, title, printer, no_copies, print_options)
def main():
try:
do_main()
except Exception as e:
err("failure in xpraforwarder main: %s" % e)
for x in traceback.format_tb(sys.exc_info()[2]):
err(x)
if __name__=='__main__':
main()
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