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unix_connect.py
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206 lines (165 loc) · 6.28 KB
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# Xlib.support.unix_connect -- Unix-type display connection functions
#
# Copyright (C) 2000,2002 Peter Liljenberg <petli@ctrl-c.liu.se>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# as published by the Free Software Foundation; either version 2.1
# of the License, or (at your option) any later version.
#
# This library 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc.,
# 59 Temple Place,
# Suite 330,
# Boston, MA 02111-1307 USA
import re
import os
import platform
import socket
# FCNTL is deprecated from Python 2.2, so only import it if we doesn't
# get the names we need. Furthermore, FD_CLOEXEC seems to be missing
# in Python 2.2.
import fcntl
if hasattr(fcntl, 'F_SETFD'):
F_SETFD = fcntl.F_SETFD
if hasattr(fcntl, 'FD_CLOEXEC'):
FD_CLOEXEC = fcntl.FD_CLOEXEC
else:
FD_CLOEXEC = 1
else:
from FCNTL import F_SETFD, FD_CLOEXEC
from Xlib import error, xauth
SUPPORTED_PROTOCOLS = (None, 'tcp', 'unix')
# Darwin funky socket.
uname = platform.uname()
if (uname[0] == 'Darwin') and ([int(x) for x in uname[2].split('.')] >= [9, 0]):
SUPPORTED_PROTOCOLS += ('darwin',)
DARWIN_DISPLAY_RE = re.compile(r'^/private/tmp/[-:a-zA-Z0-9._]*:(?P<dno>[0-9]+)(\.(?P<screen>[0-9]+))?$')
DISPLAY_RE = re.compile(r'^((?P<proto>tcp|unix)/)?(?P<host>[-:a-zA-Z0-9._]*):(?P<dno>[0-9]+)(\.(?P<screen>[0-9]+))?$')
def get_display(display):
# Use $DISPLAY if display isn't provided
if display is None:
display = os.environ.get('DISPLAY', '')
re_list = [(DISPLAY_RE, {})]
if 'darwin' in SUPPORTED_PROTOCOLS:
re_list.insert(0, (DARWIN_DISPLAY_RE, {'protocol': 'darwin'}))
for re, defaults in re_list:
m = re.match(display)
if m is not None:
protocol, host, dno, screen = [
m.groupdict().get(field, defaults.get(field))
for field in ('proto', 'host', 'dno', 'screen')
]
break
else:
raise error.DisplayNameError(display)
if protocol == 'tcp' and not host:
# Host is mandatory when protocol is TCP.
raise error.DisplayNameError(display)
dno = int(dno)
if screen:
screen = int(screen)
else:
screen = 0
return display, protocol, host, dno, screen
def _get_tcp_socket(host, dno):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, 6000 + dno))
return s
def _get_unix_socket(address):
s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
s.connect(address)
return s
def get_socket(dname, protocol, host, dno):
assert protocol in SUPPORTED_PROTOCOLS
try:
# Darwin funky socket.
if protocol == 'darwin':
s = _get_unix_socket(dname)
# TCP socket, note the special case: `unix:0.0` is equivalent to `:0.0`.
elif (protocol is None or protocol != 'unix') and host and host != 'unix':
s = _get_tcp_socket(host, dno)
# Unix socket.
else:
address = '/tmp/.X11-unix/X%d' % dno
if not os.path.exists(address):
# Use abstract address.
address = '\0' + address
try:
s = _get_unix_socket(address)
except socket.error:
if not protocol and not host:
# If no protocol/host was specified, fallback to TCP.
s = _get_tcp_socket(host, dno)
else:
raise
except socket.error as val:
raise error.DisplayConnectionError(dname, str(val))
# Make sure that the connection isn't inherited in child processes.
fcntl.fcntl(s.fileno(), F_SETFD, FD_CLOEXEC)
return s
def new_get_auth(sock, dname, protocol, host, dno):
assert protocol in SUPPORTED_PROTOCOLS
# Translate socket address into the xauth domain
if protocol == 'darwin':
family = xauth.FamilyLocal
addr = socket.gethostname()
elif protocol == 'tcp':
family = xauth.FamilyInternet
# Convert the prettyprinted IP number into 4-octet string.
# Sometimes these modules are too damn smart...
octets = sock.getpeername()[0].split('.')
addr = bytearray(int(x) for x in octets)
else:
family = xauth.FamilyLocal
addr = socket.gethostname().encode()
try:
au = xauth.Xauthority()
except error.XauthError:
return b'', b''
while 1:
try:
return au.get_best_auth(family, addr, dno)
except error.XNoAuthError:
pass
# We need to do this to handle ssh's X forwarding. It sets
# $DISPLAY to localhost:10, but stores the xauth cookie as if
# DISPLAY was :10. Hence, if localhost and not found, try
# again as a Unix socket.
if family == xauth.FamilyInternet and addr == b'\x7f\x00\x00\x01':
family = xauth.FamilyLocal
addr = socket.gethostname().encode()
else:
return b'', b''
def old_get_auth(sock, dname, host, dno):
# Find authorization cookie
auth_name = auth_data = b''
try:
# We could parse .Xauthority, but xauth is simpler
# although more inefficient
data = os.popen('xauth list %s 2>/dev/null' % dname).read()
# If there's a cookie, it is of the format
# DISPLAY SCHEME COOKIE
# We're interested in the two last parts for the
# connection establishment
lines = data.split('\n')
if len(lines) >= 1:
parts = lines[0].split(None, 2)
if len(parts) == 3:
auth_name = parts[1]
hexauth = parts[2]
auth = b''
# Translate hexcode into binary
for i in range(0, len(hexauth), 2):
auth = auth + chr(int(hexauth[i:i+2], 16))
auth_data = auth
except os.error:
pass
return auth_name, auth_data
get_auth = new_get_auth