# Todo list:
# - Setup some option parsing so the daemon can take optional command line
-# arguments.
+# arguments.
import cookielib
# Create cache dir and data dir if they are missing.
for path in [data_dir, cache_dir]:
if not os.path.exists(path):
- os.makedirs(path)
+ os.makedirs(path)
# Default config
cookie_socket = os.path.join(cache_dir, 'cookie_daemon_socket')
# Set to 0 by default until talk_to_socket is doing the spawning.
daemon_timeout = 0
-# Enable/disable daemonizing the process (useful when debugging).
+# Enable/disable daemonizing the process (useful when debugging).
# Set to False by default until talk_to_socket is doing the spawning.
daemon_mode = False
+# Set true to print helpful debugging messages to the terminal.
+verbose = True
+
# ============================================================================
# ::: End of configuration section :::::::::::::::::::::::::::::::::::::::::::
# ============================================================================
+_scriptname = os.path.basename(sys.argv[0])
+def echo(msg):
+ if verbose:
+ print "%s: %s" % (_scriptname, msg)
+
+
class CookieMonster:
'''The uzbl cookie daemon class.'''
self.daemon_timeout = daemon_timeout
self.last_request = time.time()
-
+
def run(self):
'''Start the daemon.'''
-
+
+ # Check if another daemon is running. The reclaim_socket function will
+ # exit if another daemon is detected listening on the cookie socket
+ # and remove the abandoned socket if there isnt.
+ if os.path.exists(self.cookie_socket):
+ self.reclaim_socket()
+
# Daemonize process.
if self.daemon_mode:
+ echo("entering daemon mode.")
self.daemonize()
-
- # Register a function to cleanup on exit.
+
+ # Register a function to cleanup on exit.
atexit.register(self.quit)
- # Tell SIGTERM to act orderly.
+ # Make SIGTERM act orderly.
signal(SIGTERM, lambda signum, stack_frame: sys.exit(1))
+ # Create cookie daemon socket.
+ self.create_socket()
+
+ # Create cookie jar object from file.
+ self.open_cookie_jar()
+
try:
- # Create cookie_socket
- self.create_socket()
-
- # Create jar object
- self.open_cookie_jar()
-
- # Listen for GET and PULL cookie requests.
+ # Listen for incoming cookie puts/gets.
self.listen()
-
+
except KeyboardInterrupt:
print
# Raise exception
raise
-
+
+
+ def reclaim_socket(self):
+ '''Check if another process (hopefully a cookie_daemon.py) is listening
+ on the cookie daemon socket. If another process is found to be
+ listening on the socket exit the daemon immediately and leave the
+ socket alone. If the connect fails assume the socket has been abandoned
+ and delete it (to be re-created in the create socket function).'''
+
+ try:
+ sock = socket.socket(socket.AF_UNIX, socket.SOCK_SEQPACKET)
+ sock.connect(self.cookie_socket)
+ sock.close()
+
+ except socket.error:
+ # Failed to connect to cookie_socket so assume it has been
+ # abandoned by another cookie daemon process.
+ echo("reclaiming abandoned cookie_socket %r." % self.cookie_socket)
+ if os.path.exists(self.cookie_socket):
+ os.remove(self.cookie_socket)
+
+ return
+
+ echo("detected another process listening on %r." % self.cookie_socket)
+ echo("exiting.")
+ # Use os._exit() to avoid tripping the atexit cleanup function.
+ os._exit(1)
+
def daemonize(function):
'''Daemonize the process using the Stevens' double-fork magic.'''
except OSError, e:
sys.stderr.write("fork #1 failed: %s\n" % e)
sys.exit(1)
-
+
os.chdir('/')
os.setsid()
os.umask(0)
-
+
try:
if os.fork(): os._exit(0)
except OSError, e:
sys.stderr.write("fork #2 failed: %s\n" % e)
sys.exit(1)
-
+
sys.stdout.flush()
sys.stderr.flush()
os.dup2(stdin.fileno(), sys.stdin.fileno())
os.dup2(stdout.fileno(), sys.stdout.fileno())
os.dup2(stderr.fileno(), sys.stderr.fileno())
-
+
def open_cookie_jar(self):
'''Open the cookie jar.'''
-
- # Open cookie jar.
+
+ # Create cookie jar object from file.
self.jar = cookielib.MozillaCookieJar(self.cookie_jar)
+
try:
- # Load cookies from the cookie_jar file.
+ # Attempt to load cookies from the cookie jar.
self.jar.load(ignore_discard=True)
- # Check cookie_jar only readable and writable by this user.
+ # Ensure restrictive permissions are set on the cookie jar
+ # to prevent other users on the system from hi-jacking your
+ # authenticated sessions simply by copying your cookie jar.
os.chmod(self.cookie_jar, 0600)
except:
def create_socket(self):
- '''Open socket AF_UNIX socket for uzbl instance <-> daemon
- communication.'''
-
- if os.path.exists(self.cookie_socket):
- # Don't you just love racetrack conditions!
- sys.exit(1)
-
+ '''Create AF_UNIX socket for interprocess uzbl instance <-> cookie
+ daemon communication.'''
+
self.server_socket = socket.socket(socket.AF_UNIX,\
socket.SOCK_SEQPACKET)
+ if os.path.exists(self.cookie_socket):
+ # Accounting for super-rare super-fast racetrack condition.
+ self.reclaim_socket()
+
self.server_socket.bind(self.cookie_socket)
-
- # Only allow the current user to read and write to the socket.
+
+ # Set restrictive permissions on the cookie socket to prevent other
+ # users on the system from data-mining your cookies.
os.chmod(self.cookie_socket, 0600)
'''Listen for incoming cookie PUT and GET requests.'''
while True:
- # If you get broken pipe errors increase this listen number.
+ # This line tells the socket how many pending incoming connections
+ # to enqueue. I haven't had any broken pipe errors so far while
+ # using the non-obvious value of 1 under heavy load conditions.
self.server_socket.listen(1)
if bool(select.select([self.server_socket],[],[],1)[0]):
client_socket, _ = self.server_socket.accept()
self.handle_request(client_socket)
self.last_request = time.time()
-
+ client_socket.close()
+
if self.daemon_timeout:
idle = time.time() - self.last_request
if idle > self.daemon_timeout: break
-
+
def handle_request(self, client_socket):
'''Connection made, now to serve a cookie PUT or GET request.'''
-
+
# Receive cookie request from client.
data = client_socket.recv(8192)
+ if not data: return
+
+ # Cookie argument list in packet is null separated.
argv = data.split("\0")
-
- # For debugging:
- print ' '.join(argv[:4])
+
+ # Determine whether or not to print cookie data to terminal.
+ print_cookie = (verbose and not self.daemon_mode)
+ if print_cookie: print ' '.join(argv[:4])
action = argv[0]
-
+
uri = urllib2.urlparse.ParseResult(
scheme=argv[1],
netloc=argv[2],
params='',
query='',
fragment='').geturl()
-
+
req = urllib2.Request(uri)
if action == "GET":
if req.has_header('Cookie'):
cookie = req.get_header('Cookie')
client_socket.send(cookie)
- print cookie
+ if print_cookie: print cookie
else:
client_socket.send("\0")
elif action == "PUT":
if len(argv) > 3:
set_cookie = argv[4]
- print set_cookie
+ if print_cookie: print set_cookie
else:
set_cookie = None
res = urllib2.addinfourl(StringIO.StringIO(), hdr,\
req.get_full_url())
self.jar.extract_cookies(res,req)
- self.jar.save(ignore_discard=True)
+ self.jar.save(ignore_discard=True)
- print
-
- client_socket.close()
+ if print_cookie: print
def quit(self, *args):
'''Called on exit to make sure all loose ends are tied up.'''
-
+
# Only one loose end so far.
self.del_socket()
- sys.exit(0)
-
+ os._exit(0)
+
def del_socket(self):
- '''Remove the cookie_socket file on exit. In a way the cookie_socket
+ '''Remove the cookie_socket file on exit. In a way the cookie_socket
is the daemons pid file equivalent.'''
-
+
if self.server_socket:
self.server_socket.close()
if __name__ == "__main__":
-
- if os.path.exists(cookie_socket):
- print "Error: cookie socket already exists: %r" % cookie_socket
- sys.exit(1)
-
+
CookieMonster(cookie_socket, cookie_jar, daemon_timeout,\
daemon_mode).run()
-
projects / uzbl-mobile / blobdiff