/usr/share/pyshared/plwm/inspect.py is in python-plwm 2.6a+20080530-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# inspect.py -- Allow inspection of PLWM internals
#
# Copyright (C) 2001 Peter Liljenberg <petli@ctrl-c.liu.se>
#
# 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 wmanager, event, modewindow, wmevents
import socket
import sys
import traceback
import struct
import random
import cStringIO
InspectFileEventType = event.new_event_type()
# wm mixin
class InspectServer:
inspect_enabled_at_start = 0
def __wm_init__(self):
self.inspect_socket = None
self.inspect_cookie = None
self.inspect_socket_event = None
self.inspect_clients = None
self.inspect_message = None
self.PLWM_INSPECT_SERVER = self.display.intern_atom('_PLWM_INSPECT_SERVER')
self.dispatch.add_handler(InspectFileEventType,
self.inspect_handle_file_event)
self.dispatch.add_handler(wmevents.QuitWindowManager,
self.inspect_quitwm_handler)
if self.inspect_enabled_at_start:
self.inspect_enable()
def inspect_quitwm_handler(self, evt):
self.inspect_disable(force = 1)
def inspect_enable(self):
# Inspection already enabled
if self.inspect_socket is not None:
return
wmanager.debug('inspect', 'enabling inspect server')
# Listen on any port on the local interfaces
self.inspect_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.inspect_socket.bind(('', 0))
self.inspect_socket.listen(5)
self.inspect_socket_event = event.FileEvent(InspectFileEventType,
self.inspect_socket,
event.FileEvent.READ)
self.events.add_file(self.inspect_socket_event)
# Create a authentication cookie, and store it and the
# portnumber in a property on screen 0
addr, port = self.inspect_socket.getsockname()
self.inspect_cookie = random.randint(0, 0x7ffffffe)
self.default_screen.root.change_property(self.PLWM_INSPECT_SERVER,
self.PLWM_INSPECT_SERVER,
32, [port, self.inspect_cookie])
self.inspect_clients = {}
self.inspect_message = modewindow.Message(.2, modewindow.LEFT, 0, '[Inspect]')
for s in self.screens:
try:
s.modewindow_add_message(self.inspect_message)
except AttributeError:
pass
def inspect_disable(self, force = 0):
# Inspect already disabled
if self.inspect_socket is None:
return
if self.inspect_clients:
# Shut down all clients
if force:
for c in self.inspect_clients.values():
c.close()
# Beep and abort
else:
self.display.bell(50)
return
wmanager.debug('inspect', 'disabling inspect server')
for s in self.screens:
try:
s.modewindow_remove_message(self.inspect_message)
except AttributeError:
pass
self.inspect_message = None
self.inspect_clients = None
self.default_screen.root.delete_property(self.PLWM_INSPECT_SERVER)
self.inspect_cookie = None
self.inspect_socket_event.cancel()
self.inspect_socket_event = None
self.inspect_socket.close()
self.inspect_socket = None
def inspect_toggle(self, force = 0):
if self.inspect_socket is None:
self.inspect_enable()
else:
self.inspect_disable(force)
def inspect_handle_file_event(self, evt):
if self.inspect_socket is None:
return
if evt is self.inspect_socket_event:
self.inspect_create_new_client()
else:
try:
c = self.inspect_clients[evt]
except KeyError:
pass
else:
c.handle_file_event(evt)
def inspect_create_new_client(self):
conn, addr = self.inspect_socket.accept()
wmanager.debug('inspect', 'connection from %s', addr)
client = InspectClient(self, conn, addr)
self.inspect_clients[client.event] = client
self.inspect_set_message()
def inspect_set_message(self):
if len(self.inspect_clients) == 0:
self.inspect_message.set_text('[Inspect]')
elif len(self.inspect_clients) == 1:
self.inspect_message.set_text('[Inspect: 1 client]')
else:
self.inspect_message.set_text('[Inspect: %d clients]' % len(self.inspect_clients))
def inspect_client_closed(self, client):
try:
del self.inspect_clients[client.event]
except KeyError:
pass
self.inspect_set_message()
class InspectClient:
def __init__(self, wm, sock, addr):
self.wm = wm
self.socket = sock
self.addr = addr
self.authed = 0
self.event = event.FileEvent(InspectFileEventType, self.socket,
event.FileEvent.READ)
self.wm.events.add_file(self.event)
self.recv_len = 0
self.recv_buf = ''
self.send_buf = ''
self.globals = __builtins__.copy()
self.globals['wm'] = self.wm
def handle_file_event(self, evt):
if evt.state & event.FileEvent.READ:
try:
d = self.socket.recv(500)
except socket.error, err:
wmanager.debug('inspect', 'client %s closed on failed recv: %s',
self.addr, err)
self.close()
return
if not d:
wmanager.debug('inspect', 'client %s closed', self.addr)
self.close()
return
self.recv_buf = self.recv_buf + d
# First four bytes sent must the the authentication cookie
if not self.authed:
if len(self.recv_buf) >= 4:
cookie = struct.unpack('>l', self.recv_buf[:4])[0]
self.recv_buf = self.recv_buf[4:]
if cookie == self.wm.inspect_cookie:
self.authed = 1
self.output('Welcome to PLWM at %s\n'
% self.wm.display.get_display_name())
else:
wmanager.debug('inspect',
'client %s closed on wrong cookie: %d',
self.addr, cookie)
self.close()
return
while 1:
# No length recieved yet, parse a little-endian fourbyte length
if self.recv_len == 0:
if len(self.recv_buf) >= 4:
self.recv_len = struct.unpack('>l', self.recv_buf[:4])[0]
# Do sanity check on length, abort connection if it is < 0
if self.recv_len < 0:
wmanager.debug('inspect',
'client %s closed, sent negative length: %d',
self.addr, self.recv_len)
self.close()
return
self.recv_buf = self.recv_buf[4:]
else:
break
# All data of expression read, execute it
if self.recv_len <= len(self.recv_buf):
data = self.recv_buf[:self.recv_len]
self.recv_buf = self.recv_buf[self.recv_len:]
self.recv_len = 0
self.exec_data(data)
else:
break
if evt.state & event.FileEvent.WRITE:
# Send any unsent data
try:
n = self.socket.send(self.send_buf)
except socket.error, err:
wmanager.debug('inspect', 'client %s closed on failed send: %s',
self.addr, err)
self.close()
return
self.send_buf = self.send_buf[n:]
# If there are no data left to send, clear the
# WRITE flag in the event to avoid a lot of
# select follies.
if len(self.send_buf) == 0:
evt.set_mode(clear = event.FileEvent.WRITE)
def exec_data(self, data):
# We replace the standard files with temporary ones. stdin is
# redirected from /dev/null, and stdout and stderr is sent to
# a StringIO object.
old_stdin = sys.stdin
old_stdout = sys.stdout
old_stderr = sys.stderr
f = cStringIO.StringIO()
try:
sys.stdin = open('/dev/null', 'r')
sys.stdout = sys.stderr = f
# Compile and execute the expressions. print statements
# and expression values will be sent to the StringIO
# object, as will any exception traceback
try:
c = compile(data, '<string>', 'single')
exec c in self.globals
except:
traceback.print_exc(None, f)
finally:
# Restore the standard files
sys.stdin = old_stdin
sys.stdout = old_stdout
sys.stderr = old_stderr
self.output(f.getvalue())
def output(self, data):
# Encode output for sending, and tell the event loop that
# we are interested in WRITE readiness
self.send_buf = self.send_buf + struct.pack('>l', len(data)) + data
self.event.set_mode(set = event.FileEvent.WRITE)
def close(self):
self.socket.close()
self.event.cancel()
if self.wm:
self.wm.inspect_client_closed(self)
self.wm = None
self.globals = None
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