| Current Path : /lib/python3/dist-packages/websockify/ |
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| Current File : //lib/python3/dist-packages/websockify/websocketproxy.py |
#!/usr/bin/env python
'''
A WebSocket to TCP socket proxy with support for "wss://" encryption.
Copyright 2011 Joel Martin
Licensed under LGPL version 3 (see docs/LICENSE.LGPL-3)
You can make a cert/key with openssl using:
openssl req -new -x509 -days 365 -nodes -out self.pem -keyout self.pem
as taken from http://docs.python.org/dev/library/ssl.html#certificates
'''
import signal, socket, optparse, time, os, sys, subprocess, logging, errno, ssl
try:
from socketserver import ThreadingMixIn
except ImportError:
from SocketServer import ThreadingMixIn
try:
from http.server import HTTPServer
except ImportError:
from BaseHTTPServer import HTTPServer
import select
from websockify import websockifyserver
from websockify import auth_plugins as auth
try:
from urllib.parse import parse_qs, urlparse
except ImportError:
from cgi import parse_qs
from urlparse import urlparse
class ProxyRequestHandler(websockifyserver.WebSockifyRequestHandler):
buffer_size = 65536
traffic_legend = """
Traffic Legend:
} - Client receive
}. - Client receive partial
{ - Target receive
> - Target send
>. - Target send partial
< - Client send
<. - Client send partial
"""
def send_auth_error(self, ex):
self.send_response(ex.code, ex.msg)
self.send_header('Content-Type', 'text/html')
for name, val in ex.headers.items():
self.send_header(name, val)
self.end_headers()
def validate_connection(self):
if not self.server.token_plugin:
return
host, port = self.get_target(self.server.token_plugin)
if host == 'unix_socket':
self.server.unix_target = port
else:
self.server.target_host = host
self.server.target_port = port
def auth_connection(self):
if not self.server.auth_plugin:
return
try:
# get client certificate data
client_cert_data = self.request.getpeercert()
# extract subject information
client_cert_subject = client_cert_data['subject']
# flatten data structure
client_cert_subject = dict([x[0] for x in client_cert_subject])
# add common name to headers (apache +StdEnvVars style)
self.headers['SSL_CLIENT_S_DN_CN'] = client_cert_subject['commonName']
except (TypeError, AttributeError, KeyError):
# not a SSL connection or client presented no certificate with valid data
pass
try:
self.server.auth_plugin.authenticate(
headers=self.headers, target_host=self.server.target_host,
target_port=self.server.target_port)
except auth.AuthenticationError:
ex = sys.exc_info()[1]
self.send_auth_error(ex)
raise
def new_websocket_client(self):
"""
Called after a new WebSocket connection has been established.
"""
# Checking for a token is done in validate_connection()
# Connect to the target
if self.server.wrap_cmd:
msg = "connecting to command: '%s' (port %s)" % (" ".join(self.server.wrap_cmd), self.server.target_port)
elif self.server.unix_target:
msg = "connecting to unix socket: %s" % self.server.unix_target
else:
msg = "connecting to: %s:%s" % (
self.server.target_host, self.server.target_port)
if self.server.ssl_target:
msg += " (using SSL)"
self.log_message(msg)
try:
tsock = websockifyserver.WebSockifyServer.socket(self.server.target_host,
self.server.target_port,
connect=True,
use_ssl=self.server.ssl_target,
unix_socket=self.server.unix_target)
except Exception:
self.log_message("Failed to connect to %s:%s",
self.server.target_host, self.server.target_port)
raise self.CClose(1011, "Failed to connect to downstream server")
self.request.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
if not self.server.wrap_cmd and not self.server.unix_target:
tsock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
self.print_traffic(self.traffic_legend)
# Start proxying
try:
self.do_proxy(tsock)
finally:
if tsock:
tsock.shutdown(socket.SHUT_RDWR)
tsock.close()
if self.verbose:
self.log_message("%s:%s: Closed target",
self.server.target_host, self.server.target_port)
def get_target(self, target_plugin):
"""
Gets a token from either the path or the host,
depending on --host-token, and looks up a target
for that token using the token plugin. Used by
validate_connection() to set target_host and target_port.
"""
# The files in targets contain the lines
# in the form of token: host:port
if self.host_token:
# Use hostname as token
token = self.headers.get('Host')
# Remove port from hostname, as it'll always be the one where
# websockify listens (unless something between the client and
# websockify is redirecting traffic, but that's beside the point)
if token:
token = token.partition(':')[0]
else:
# Extract the token parameter from url
args = parse_qs(urlparse(self.path)[4]) # 4 is the query from url
if 'token' in args and len(args['token']):
token = args['token'][0].rstrip('\n')
else:
token = None
if token is None:
raise self.server.EClose("Token not present")
result_pair = target_plugin.lookup(token)
if result_pair is not None:
return result_pair
else:
raise self.server.EClose("Token '%s' not found" % token)
def do_proxy(self, target):
"""
Proxy client WebSocket to normal target socket.
"""
cqueue = []
c_pend = 0
tqueue = []
rlist = [self.request, target]
if self.server.heartbeat:
now = time.time()
self.heartbeat = now + self.server.heartbeat
else:
self.heartbeat = None
while True:
wlist = []
if self.heartbeat is not None:
now = time.time()
if now > self.heartbeat:
self.heartbeat = now + self.server.heartbeat
self.send_ping()
if tqueue: wlist.append(target)
if cqueue or c_pend: wlist.append(self.request)
try:
ins, outs, excepts = select.select(rlist, wlist, [], 1)
except (select.error, OSError):
exc = sys.exc_info()[1]
if hasattr(exc, 'errno'):
err = exc.errno
else:
err = exc[0]
if err != errno.EINTR:
raise
else:
continue
if excepts: raise Exception("Socket exception")
if self.request in outs:
# Send queued target data to the client
c_pend = self.send_frames(cqueue)
cqueue = []
if self.request in ins:
# Receive client data, decode it, and queue for target
bufs, closed = self.recv_frames()
tqueue.extend(bufs)
if closed:
# TODO: What about blocking on client socket?
if self.verbose:
self.log_message("%s:%s: Client closed connection",
self.server.target_host, self.server.target_port)
raise self.CClose(closed['code'], closed['reason'])
if target in outs:
# Send queued client data to the target
dat = tqueue.pop(0)
sent = target.send(dat)
if sent == len(dat):
self.print_traffic(">")
else:
# requeue the remaining data
tqueue.insert(0, dat[sent:])
self.print_traffic(".>")
if target in ins:
# Receive target data, encode it and queue for client
buf = target.recv(self.buffer_size)
if len(buf) == 0:
if self.verbose:
self.log_message("%s:%s: Target closed connection",
self.server.target_host, self.server.target_port)
raise self.CClose(1000, "Target closed")
cqueue.append(buf)
self.print_traffic("{")
class WebSocketProxy(websockifyserver.WebSockifyServer):
"""
Proxy traffic to and from a WebSockets client to a normal TCP
socket server target.
"""
buffer_size = 65536
def __init__(self, RequestHandlerClass=ProxyRequestHandler, *args, **kwargs):
# Save off proxy specific options
self.target_host = kwargs.pop('target_host', None)
self.target_port = kwargs.pop('target_port', None)
self.wrap_cmd = kwargs.pop('wrap_cmd', None)
self.wrap_mode = kwargs.pop('wrap_mode', None)
self.unix_target = kwargs.pop('unix_target', None)
self.ssl_target = kwargs.pop('ssl_target', None)
self.heartbeat = kwargs.pop('heartbeat', None)
self.token_plugin = kwargs.pop('token_plugin', None)
self.host_token = kwargs.pop('host_token', None)
self.auth_plugin = kwargs.pop('auth_plugin', None)
# Last 3 timestamps command was run
self.wrap_times = [0, 0, 0]
if self.wrap_cmd:
wsdir = os.path.dirname(sys.argv[0])
rebinder_path = [os.path.join(wsdir, "..", "lib"),
os.path.join(wsdir, "..", "lib", "websockify"),
wsdir]
self.rebinder = None
for rdir in rebinder_path:
rpath = os.path.join(rdir, "rebind.so")
if os.path.exists(rpath):
self.rebinder = rpath
break
if not self.rebinder:
raise Exception("rebind.so not found, perhaps you need to run make")
self.rebinder = os.path.abspath(self.rebinder)
self.target_host = "127.0.0.1" # Loopback
# Find a free high port
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(('', 0))
self.target_port = sock.getsockname()[1]
sock.close()
os.environ.update({
"LD_PRELOAD": self.rebinder,
"REBIND_OLD_PORT": str(kwargs['listen_port']),
"REBIND_NEW_PORT": str(self.target_port)})
websockifyserver.WebSockifyServer.__init__(self, RequestHandlerClass, *args, **kwargs)
def run_wrap_cmd(self):
self.msg("Starting '%s'", " ".join(self.wrap_cmd))
self.wrap_times.append(time.time())
self.wrap_times.pop(0)
self.cmd = subprocess.Popen(
self.wrap_cmd, env=os.environ, preexec_fn=_subprocess_setup)
self.spawn_message = True
def started(self):
"""
Called after Websockets server startup (i.e. after daemonize)
"""
# Need to call wrapped command after daemonization so we can
# know when the wrapped command exits
if self.wrap_cmd:
dst_string = "'%s' (port %s)" % (" ".join(self.wrap_cmd), self.target_port)
elif self.unix_target:
dst_string = self.unix_target
else:
dst_string = "%s:%s" % (self.target_host, self.target_port)
if self.listen_fd != None:
src_string = "inetd"
else:
src_string = "%s:%s" % (self.listen_host, self.listen_port)
if self.token_plugin:
msg = " - proxying from %s to targets generated by %s" % (
src_string, type(self.token_plugin).__name__)
else:
msg = " - proxying from %s to %s" % (
src_string, dst_string)
if self.ssl_target:
msg += " (using SSL)"
self.msg("%s", msg)
if self.wrap_cmd:
self.run_wrap_cmd()
def poll(self):
# If we are wrapping a command, check it's status
if self.wrap_cmd and self.cmd:
ret = self.cmd.poll()
if ret != None:
self.vmsg("Wrapped command exited (or daemon). Returned %s" % ret)
self.cmd = None
if self.wrap_cmd and self.cmd == None:
# Response to wrapped command being gone
if self.wrap_mode == "ignore":
pass
elif self.wrap_mode == "exit":
sys.exit(ret)
elif self.wrap_mode == "respawn":
now = time.time()
avg = sum(self.wrap_times)/len(self.wrap_times)
if (now - avg) < 10:
# 3 times in the last 10 seconds
if self.spawn_message:
self.warn("Command respawning too fast")
self.spawn_message = False
else:
self.run_wrap_cmd()
def _subprocess_setup():
# Python installs a SIGPIPE handler by default. This is usually not what
# non-Python successfulbprocesses expect.
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
try :
# First try SSL options for Python 3.4 and above
SSL_OPTIONS = {
'default': ssl.OP_ALL,
'tlsv1_1': ssl.PROTOCOL_TLS | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 |
ssl.OP_NO_TLSv1,
'tlsv1_2': ssl.PROTOCOL_TLS | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 |
ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1,
'tlsv1_3': ssl.PROTOCOL_TLS | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 |
ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 | ssl.OP_NO_TLSv1_2,
}
except AttributeError:
try:
# Python 3.3 uses a different scheme for SSL options
# tlsv1_3 is not supported on older Python versions
SSL_OPTIONS = {
'default': ssl.OP_ALL,
'tlsv1_1': ssl.PROTOCOL_TLSv1 | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 |
ssl.OP_NO_TLSv1,
'tlsv1_2': ssl.PROTOCOL_TLSv1 | ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 |
ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1,
}
except AttributeError:
# Python 2.6 does not support TLS v1.2, and uses a different scheme
# for SSL options
SSL_OPTIONS = {
'default': ssl.PROTOCOL_SSLv23,
'tlsv1_1': ssl.PROTOCOL_TLSv1,
}
def select_ssl_version(version):
"""Returns SSL options for the most secure TSL version available on this
Python version"""
if version in SSL_OPTIONS:
return SSL_OPTIONS[version]
else:
# It so happens that version names sorted lexicographically form a list
# from the least to the most secure
keys = list(SSL_OPTIONS.keys())
keys.sort()
fallback = keys[-1]
logger = logging.getLogger(WebSocketProxy.log_prefix)
logger.warn("TLS version %s unsupported. Falling back to %s",
version, fallback)
return SSL_OPTIONS[fallback]
def websockify_init():
# Setup basic logging to stderr.
logger = logging.getLogger(WebSocketProxy.log_prefix)
logger.propagate = False
logger.setLevel(logging.INFO)
stderr_handler = logging.StreamHandler()
stderr_handler.setLevel(logging.DEBUG)
log_formatter = logging.Formatter("%(message)s")
stderr_handler.setFormatter(log_formatter)
logger.addHandler(stderr_handler)
# Setup optparse.
usage = "\n %prog [options]"
usage += " [source_addr:]source_port [target_addr:target_port]"
usage += "\n %prog [options]"
usage += " [source_addr:]source_port -- WRAP_COMMAND_LINE"
parser = optparse.OptionParser(usage=usage)
parser.add_option("--verbose", "-v", action="store_true",
help="verbose messages")
parser.add_option("--traffic", action="store_true",
help="per frame traffic")
parser.add_option("--record",
help="record sessions to FILE.[session_number]", metavar="FILE")
parser.add_option("--daemon", "-D",
dest="daemon", action="store_true",
help="become a daemon (background process)")
parser.add_option("--run-once", action="store_true",
help="handle a single WebSocket connection and exit")
parser.add_option("--timeout", type=int, default=0,
help="after TIMEOUT seconds exit when not connected")
parser.add_option("--idle-timeout", type=int, default=0,
help="server exits after TIMEOUT seconds if there are no "
"active connections")
parser.add_option("--cert", default="self.pem",
help="SSL certificate file")
parser.add_option("--key", default=None,
help="SSL key file (if separate from cert)")
parser.add_option("--key-password", default=None,
help="SSL key password")
parser.add_option("--ssl-only", action="store_true",
help="disallow non-encrypted client connections")
parser.add_option("--ssl-target", action="store_true",
help="connect to SSL target as SSL client")
parser.add_option("--verify-client", action="store_true",
help="require encrypted client to present a valid certificate "
"(needs Python 2.7.9 or newer or Python 3.4 or newer)")
parser.add_option("--cafile", metavar="FILE",
help="file of concatenated certificates of authorities trusted "
"for validating clients (only effective with --verify-client). "
"If omitted, system default list of CAs is used.")
parser.add_option("--ssl-version", type="choice", default="default",
choices=["default", "tlsv1_1", "tlsv1_2", "tlsv1_3"], action="store",
help="minimum TLS version to use (default, tlsv1_1, tlsv1_2, tlsv1_3)")
parser.add_option("--ssl-ciphers", action="store",
help="list of ciphers allowed for connection. For a list of "
"supported ciphers run `openssl ciphers`")
parser.add_option("--unix-target",
help="connect to unix socket target", metavar="FILE")
parser.add_option("--inetd",
help="inetd mode, receive listening socket from stdin", action="store_true")
parser.add_option("--web", default=None, metavar="DIR",
help="run webserver on same port. Serve files from DIR.")
parser.add_option("--web-auth", action="store_true",
help="require authentication to access webserver.")
parser.add_option("--wrap-mode", default="exit", metavar="MODE",
choices=["exit", "ignore", "respawn"],
help="action to take when the wrapped program exits "
"or daemonizes: exit (default), ignore, respawn")
parser.add_option("--prefer-ipv6", "-6",
action="store_true", dest="source_is_ipv6",
help="prefer IPv6 when resolving source_addr")
parser.add_option("--libserver", action="store_true",
help="use Python library SocketServer engine")
parser.add_option("--target-config", metavar="FILE",
dest="target_cfg",
help="Configuration file containing valid targets "
"in the form 'token: host:port' or, alternatively, a "
"directory containing configuration files of this form "
"(DEPRECATED: use `--token-plugin TokenFile --token-source "
" path/to/token/file` instead)")
parser.add_option("--token-plugin", default=None, metavar="CLASS",
help="use a Python class, usually one from websockify.token_plugins, "
"such as TokenFile, to process tokens into host:port pairs")
parser.add_option("--token-source", default=None, metavar="ARG",
help="an argument to be passed to the token plugin "
"on instantiation")
parser.add_option("--host-token", action="store_true",
help="use the host HTTP header as token instead of the "
"token URL query parameter")
parser.add_option("--auth-plugin", default=None, metavar="CLASS",
help="use a Python class, usually one from websockify.auth_plugins, "
"such as BasicHTTPAuth, to determine if a connection is allowed")
parser.add_option("--auth-source", default=None, metavar="ARG",
help="an argument to be passed to the auth plugin "
"on instantiation")
parser.add_option("--heartbeat", type=int, default=0, metavar="INTERVAL",
help="send a ping to the client every INTERVAL seconds")
parser.add_option("--log-file", metavar="FILE",
dest="log_file",
help="File where logs will be saved")
parser.add_option("--syslog", default=None, metavar="SERVER",
help="Log to syslog server. SERVER can be local socket, "
"such as /dev/log, or a UDP host:port pair.")
parser.add_option("--legacy-syslog", action="store_true",
help="Use the old syslog protocol instead of RFC 5424. "
"Use this if the messages produced by websockify seem abnormal.")
(opts, args) = parser.parse_args()
# Validate options.
if opts.token_source and not opts.token_plugin:
parser.error("You must use --token-plugin to use --token-source")
if opts.host_token and not opts.token_plugin:
parser.error("You must use --token-plugin to use --host-token")
if opts.auth_source and not opts.auth_plugin:
parser.error("You must use --auth-plugin to use --auth-source")
if opts.web_auth and not opts.auth_plugin:
parser.error("You must use --auth-plugin to use --web-auth")
if opts.web_auth and not opts.web:
parser.error("You must use --web to use --web-auth")
if opts.legacy_syslog and not opts.syslog:
parser.error("You must use --syslog to use --legacy-syslog")
opts.ssl_options = select_ssl_version(opts.ssl_version)
del opts.ssl_version
if opts.log_file:
# Setup logging to user-specified file.
opts.log_file = os.path.abspath(opts.log_file)
log_file_handler = logging.FileHandler(opts.log_file)
log_file_handler.setLevel(logging.DEBUG)
log_file_handler.setFormatter(log_formatter)
logger.addHandler(log_file_handler)
del opts.log_file
if opts.syslog:
# Determine how to connect to syslog...
if opts.syslog.count(':'):
# User supplied a host:port pair.
syslog_host, syslog_port = opts.syslog.rsplit(':', 1)
try:
syslog_port = int(syslog_port)
except ValueError:
parser.error("Error parsing syslog port")
syslog_dest = (syslog_host, syslog_port)
else:
# User supplied a local socket file.
syslog_dest = os.path.abspath(opts.syslog)
from websockify.sysloghandler import WebsockifySysLogHandler
# Determine syslog facility.
if opts.daemon:
syslog_facility = WebsockifySysLogHandler.LOG_DAEMON
else:
syslog_facility = WebsockifySysLogHandler.LOG_USER
# Start logging to syslog.
syslog_handler = WebsockifySysLogHandler(address=syslog_dest,
facility=syslog_facility,
ident='websockify',
legacy=opts.legacy_syslog)
syslog_handler.setLevel(logging.DEBUG)
syslog_handler.setFormatter(log_formatter)
logger.addHandler(syslog_handler)
del opts.syslog
del opts.legacy_syslog
if opts.verbose:
logger.setLevel(logging.DEBUG)
# Transform to absolute path as daemon may chdir
if opts.target_cfg:
opts.target_cfg = os.path.abspath(opts.target_cfg)
if opts.target_cfg:
opts.token_plugin = 'TokenFile'
opts.token_source = opts.target_cfg
del opts.target_cfg
if sys.argv.count('--'):
opts.wrap_cmd = args[1:]
else:
opts.wrap_cmd = None
if not websockifyserver.ssl and opts.ssl_target:
parser.error("SSL target requested and Python SSL module not loaded.");
if opts.ssl_only and not os.path.exists(opts.cert):
parser.error("SSL only and %s not found" % opts.cert)
if opts.inetd:
opts.listen_fd = sys.stdin.fileno()
else:
if len(args) < 1:
parser.error("Too few arguments")
arg = args.pop(0)
# Parse host:port and convert ports to numbers
if arg.count(':') > 0:
opts.listen_host, opts.listen_port = arg.rsplit(':', 1)
opts.listen_host = opts.listen_host.strip('[]')
else:
opts.listen_host, opts.listen_port = '', arg
try:
opts.listen_port = int(opts.listen_port)
except ValueError:
parser.error("Error parsing listen port")
del opts.inetd
if opts.wrap_cmd or opts.unix_target or opts.token_plugin:
opts.target_host = None
opts.target_port = None
else:
if len(args) < 1:
parser.error("Too few arguments")
arg = args.pop(0)
if arg.count(':') > 0:
opts.target_host, opts.target_port = arg.rsplit(':', 1)
opts.target_host = opts.target_host.strip('[]')
else:
parser.error("Error parsing target")
try:
opts.target_port = int(opts.target_port)
except ValueError:
parser.error("Error parsing target port")
if len(args) > 0 and opts.wrap_cmd == None:
parser.error("Too many arguments")
if opts.token_plugin is not None:
if '.' not in opts.token_plugin:
opts.token_plugin = (
'websockify.token_plugins.%s' % opts.token_plugin)
token_plugin_module, token_plugin_cls = opts.token_plugin.rsplit('.', 1)
__import__(token_plugin_module)
token_plugin_cls = getattr(sys.modules[token_plugin_module], token_plugin_cls)
opts.token_plugin = token_plugin_cls(opts.token_source)
del opts.token_source
if opts.auth_plugin is not None:
if '.' not in opts.auth_plugin:
opts.auth_plugin = 'websockify.auth_plugins.%s' % opts.auth_plugin
auth_plugin_module, auth_plugin_cls = opts.auth_plugin.rsplit('.', 1)
__import__(auth_plugin_module)
auth_plugin_cls = getattr(sys.modules[auth_plugin_module], auth_plugin_cls)
opts.auth_plugin = auth_plugin_cls(opts.auth_source)
del opts.auth_source
# Create and start the WebSockets proxy
libserver = opts.libserver
del opts.libserver
if libserver:
# Use standard Python SocketServer framework
server = LibProxyServer(**opts.__dict__)
server.serve_forever()
else:
# Use internal service framework
server = WebSocketProxy(**opts.__dict__)
server.start_server()
class LibProxyServer(ThreadingMixIn, HTTPServer):
"""
Just like WebSocketProxy, but uses standard Python SocketServer
framework.
"""
def __init__(self, RequestHandlerClass=ProxyRequestHandler, **kwargs):
# Save off proxy specific options
self.target_host = kwargs.pop('target_host', None)
self.target_port = kwargs.pop('target_port', None)
self.wrap_cmd = kwargs.pop('wrap_cmd', None)
self.wrap_mode = kwargs.pop('wrap_mode', None)
self.unix_target = kwargs.pop('unix_target', None)
self.ssl_target = kwargs.pop('ssl_target', None)
self.token_plugin = kwargs.pop('token_plugin', None)
self.auth_plugin = kwargs.pop('auth_plugin', None)
self.heartbeat = kwargs.pop('heartbeat', None)
self.token_plugin = None
self.auth_plugin = None
self.daemon = False
# Server configuration
listen_host = kwargs.pop('listen_host', '')
listen_port = kwargs.pop('listen_port', None)
web = kwargs.pop('web', '')
# Configuration affecting base request handler
self.only_upgrade = not web
self.verbose = kwargs.pop('verbose', False)
record = kwargs.pop('record', '')
if record:
self.record = os.path.abspath(record)
self.run_once = kwargs.pop('run_once', False)
self.handler_id = 0
for arg in kwargs.keys():
print("warning: option %s ignored when using --libserver" % arg)
if web:
os.chdir(web)
HTTPServer.__init__(self, (listen_host, listen_port),
RequestHandlerClass)
def process_request(self, request, client_address):
"""Override process_request to implement a counter"""
self.handler_id += 1
ThreadingMixIn.process_request(self, request, client_address)
if __name__ == '__main__':
websockify_init()