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Commit 082027dc authored by samhed's avatar samhed
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Sync with websockify 

Pull 90b519edf0c1857d
parent 60a415ae
Show whitespace changes
Inline Side-by-side
Showing with 768 additions and 551 deletions
include/websock.js
View file @ 082027dc
......@@ -262,7 +262,7 @@ function on(evt, handler) {
eventHandlers[evt] = handler;
}
function init(protocols, ws_schema) {
function init(protocols) {
rQ = [];
rQi = 0;
sQ = [];
......@@ -278,14 +278,11 @@ function init(protocols, ws_schema) {
bt = true;
}
// Check for full binary type support in WebSocket
// Inspired by:
// https://github.com/Modernizr/Modernizr/issues/370
// https://github.com/Modernizr/Modernizr/blob/master/feature-detects/websockets/binary.js
// Check for full binary type support in WebSockets
// TODO: this sucks, the property should exist on the prototype
// but it does not.
try {
if (bt &&
('binaryType' in WebSocket.prototype ||
!!(new WebSocket(ws_schema + '://.').binaryType))) {
if (bt && ('binaryType' in (new WebSocket("ws://localhost:17523")))) {
Util.Info("Detected binaryType support in WebSockets");
wsbt = true;
}
......@@ -328,8 +325,7 @@ function init(protocols, ws_schema) {
}
function open(uri, protocols) {
var ws_schema = uri.match(/^([a-z]+):\/\//)[1];
protocols = init(protocols, ws_schema);
protocols = init(protocols);
if (test_mode) {
websocket = {};
......
utils/websocket.py
View file @ 082027dc
......@@ -16,7 +16,7 @@ as taken from http://docs.python.org/dev/library/ssl.html#certificates
'''
import os, sys, time, errno, signal, socket, traceback, select
import os, sys, time, errno, signal, socket, select, logging
import array, struct
from base64 import b64encode, b64decode
......@@ -59,177 +59,57 @@ for mod, msg in [('numpy', 'HyBi protocol will be slower'),
except ImportError:
globals()[mod] = None
print("WARNING: no '%s' module, %s" % (mod, msg))
if multiprocessing and sys.platform == 'win32':
# make sockets pickle-able/inheritable
import multiprocessing.reduction
class WebSocketServer(object):
# HTTP handler with WebSocket upgrade support
class WebSocketRequestHandler(SimpleHTTPRequestHandler):
"""
WebSockets server class.
Must be sub-classed with new_client method definition.
WebSocket Request Handler Class, derived from SimpleHTTPRequestHandler.
Must be sub-classed with new_websocket_client method definition.
The request handler can be configured by setting optional
attributes on the server object:
* only_upgrade: If true, SimpleHTTPRequestHandler will not be enabled,
only websocket is allowed.
* verbose: If true, verbose logging is activated.
* daemon: Running as daemon, do not write to console etc
* record: Record raw frame data as JavaScript array into specified filename
* run_once: Handle a single request
* handler_id: A sequence number for this connection, appended to record filename
"""
buffer_size = 65536
server_handshake_hybi = """HTTP/1.1 101 Switching Protocols\r
Upgrade: websocket\r
Connection: Upgrade\r
Sec-WebSocket-Accept: %s\r
"""
GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
policy_response = """<cross-domain-policy><allow-access-from domain="*" to-ports="*" /></cross-domain-policy>\n"""
server_version = "WebSockify"
# An exception before the WebSocket connection was established
class EClose(Exception):
pass
protocol_version = "HTTP/1.1"
# An exception while the WebSocket client was connected
class CClose(Exception):
pass
def __init__(self, listen_host='', listen_port=None, source_is_ipv6=False,
verbose=False, cert='', key='', ssl_only=None,
daemon=False, record='', web='',
run_once=False, timeout=0, idle_timeout=0):
# settings
self.verbose = verbose
self.listen_host = listen_host
self.listen_port = listen_port
self.prefer_ipv6 = source_is_ipv6
self.ssl_only = ssl_only
self.daemon = daemon
self.run_once = run_once
self.timeout = timeout
self.idle_timeout = idle_timeout
self.launch_time = time.time()
self.ws_connection = False
self.handler_id = 1
# Make paths settings absolute
self.cert = os.path.abspath(cert)
self.key = self.web = self.record = ''
if key:
self.key = os.path.abspath(key)
if web:
self.web = os.path.abspath(web)
if record:
self.record = os.path.abspath(record)
if self.web:
os.chdir(self.web)
# Sanity checks
if not ssl and self.ssl_only:
raise Exception("No 'ssl' module and SSL-only specified")
if self.daemon and not resource:
raise Exception("Module 'resource' required to daemonize")
# Show configuration
print("WebSocket server settings:")
print(" - Listen on %s:%s" % (
self.listen_host, self.listen_port))
print(" - Flash security policy server")
if self.web:
print(" - Web server. Web root: %s" % self.web)
if ssl:
if os.path.exists(self.cert):
print(" - SSL/TLS support")
if self.ssl_only:
print(" - Deny non-SSL/TLS connections")
else:
print(" - No SSL/TLS support (no cert file)")
else:
print(" - No SSL/TLS support (no 'ssl' module)")
if self.daemon:
print(" - Backgrounding (daemon)")
if self.record:
print(" - Recording to '%s.*'" % self.record)
#
# WebSocketServer static methods
#
@staticmethod
def socket(host, port=None, connect=False, prefer_ipv6=False, unix_socket=None, use_ssl=False):
""" Resolve a host (and optional port) to an IPv4 or IPv6
address. Create a socket. Bind to it if listen is set,
otherwise connect to it. Return the socket.
"""
flags = 0
if host == '':
host = None
if connect and not (port or unix_socket):
raise Exception("Connect mode requires a port")
if use_ssl and not ssl:
raise Exception("SSL socket requested but Python SSL module not loaded.");
if not connect and use_ssl:
raise Exception("SSL only supported in connect mode (for now)")
if not connect:
flags = flags | socket.AI_PASSIVE
if not unix_socket:
addrs = socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM,
socket.IPPROTO_TCP, flags)
if not addrs:
raise Exception("Could not resolve host '%s'" % host)
addrs.sort(key=lambda x: x[0])
if prefer_ipv6:
addrs.reverse()
sock = socket.socket(addrs[0][0], addrs[0][1])
if connect:
sock.connect(addrs[0][4])
if use_ssl:
sock = ssl.wrap_socket(sock)
else:
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(addrs[0][4])
sock.listen(100)
else:
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.connect(unix_socket)
return sock
@staticmethod
def daemonize(keepfd=None, chdir='/'):
os.umask(0)
if chdir:
os.chdir(chdir)
else:
os.chdir('/')
os.setgid(os.getgid()) # relinquish elevations
os.setuid(os.getuid()) # relinquish elevations
# Double fork to daemonize
if os.fork() > 0: os._exit(0) # Parent exits
os.setsid() # Obtain new process group
if os.fork() > 0: os._exit(0) # Parent exits
# Signal handling
def terminate(a,b): os._exit(0)
signal.signal(signal.SIGTERM, terminate)
signal.signal(signal.SIGINT, signal.SIG_IGN)
def __init__(self, req, addr, server):
# Retrieve a few configuration variables from the server
self.only_upgrade = getattr(server, "only_upgrade", False)
self.verbose = getattr(server, "verbose", False)
self.daemon = getattr(server, "daemon", False)
self.record = getattr(server, "record", False)
self.run_once = getattr(server, "run_once", False)
self.rec = None
self.handler_id = getattr(server, "handler_id", False)
self.file_only = getattr(server, "file_only", False)
self.traffic = getattr(server, "traffic", False)
# Close open files
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if maxfd == resource.RLIM_INFINITY: maxfd = 256
for fd in reversed(range(maxfd)):
try:
if fd != keepfd:
os.close(fd)
except OSError:
_, exc, _ = sys.exc_info()
if exc.errno != errno.EBADF: raise
self.logger = getattr(server, "logger", None)
if self.logger is None:
self.logger = WebSocketServer.get_logger()
# Redirect I/O to /dev/null
os.dup2(os.open(os.devnull, os.O_RDWR), sys.stdin.fileno())
os.dup2(os.open(os.devnull, os.O_RDWR), sys.stdout.fileno())
os.dup2(os.open(os.devnull, os.O_RDWR), sys.stderr.fileno())
SimpleHTTPRequestHandler.__init__(self, req, addr, server)
@staticmethod
def unmask(buf, hlen, plen):
......@@ -246,7 +126,7 @@ Sec-WebSocket-Accept: %s\r
b = numpy.bitwise_xor(data, mask).tostring()
if plen % 4:
#print("Partial unmask")
#self.msg("Partial unmask")
mask = numpy.frombuffer(buf, dtype=numpy.dtype('B'),
offset=hlen, count=(plen % 4))
data = numpy.frombuffer(buf, dtype=numpy.dtype('B'),
......@@ -287,12 +167,12 @@ Sec-WebSocket-Accept: %s\r
elif payload_len >= 65536:
header = pack('>BBQ', b1, 127, payload_len)
#print("Encoded: %s" % repr(header + buf))
#self.msg("Encoded: %s", repr(header + buf))
return header + buf, len(header), 0
@staticmethod
def decode_hybi(buf, base64=False):
def decode_hybi(buf, base64=False, logger=None):
""" Decode HyBi style WebSocket packets.
Returns:
{'fin' : 0_or_1,
......@@ -316,6 +196,9 @@ Sec-WebSocket-Accept: %s\r
'close_code' : 1000,
'close_reason' : ''}
if logger is None:
logger = WebSocketServer.get_logger()
blen = len(buf)
f['left'] = blen
......@@ -351,18 +234,18 @@ Sec-WebSocket-Accept: %s\r
# Process 1 frame
if f['masked']:
# unmask payload
f['payload'] = WebSocketServer.unmask(buf, f['hlen'],
f['payload'] = WebSocketRequestHandler.unmask(buf, f['hlen'],
f['length'])
else:
print("Unmasked frame: %s" % repr(buf))
logger.debug("Unmasked frame: %s" % repr(buf))
f['payload'] = buf[(f['hlen'] + f['masked'] * 4):full_len]
if base64 and f['opcode'] in [1, 2]:
try:
f['payload'] = b64decode(f['payload'])
except:
print("Exception while b64decoding buffer: %s" %
repr(buf))
logger.exception("Exception while b64decoding buffer: %s" %
(repr(buf)))
raise
if f['opcode'] == 0x08:
......@@ -375,27 +258,32 @@ Sec-WebSocket-Accept: %s\r
#
# WebSocketServer logging/output functions
# WebSocketRequestHandler logging/output functions
#
def traffic(self, token="."):
""" Show traffic flow in verbose mode. """
if self.verbose and not self.daemon:
def print_traffic(self, token="."):
""" Show traffic flow mode. """
if self.traffic:
sys.stdout.write(token)
sys.stdout.flush()
def msg(self, msg):
def msg(self, msg, *args, **kwargs):
""" Output message with handler_id prefix. """
if not self.daemon:
print("% 3d: %s" % (self.handler_id, msg))
prefix = "% 3d: " % self.handler_id
self.logger.log(logging.INFO, "%s%s" % (prefix, msg), *args, **kwargs)
def vmsg(self, msg):
""" Same as msg() but only if verbose. """
if self.verbose:
self.msg(msg)
def vmsg(self, msg, *args, **kwargs):
""" Same as msg() but as debug. """
prefix = "% 3d: " % self.handler_id
self.logger.log(logging.DEBUG, "%s%s" % (prefix, msg), *args, **kwargs)
def warn(self, msg, *args, **kwargs):
""" Same as msg() but as warning. """
prefix = "% 3d: " % self.handler_id
self.logger.log(logging.WARN, "%s%s" % (prefix, msg), *args, **kwargs)
#
# Main WebSocketServer methods
# Main WebSocketRequestHandler methods
#
def send_frames(self, bufs=None):
""" Encode and send WebSocket frames. Any frames already
......@@ -424,12 +312,12 @@ Sec-WebSocket-Accept: %s\r
while self.send_parts:
# Send pending frames
buf = self.send_parts.pop(0)
sent = self.client.send(buf)
sent = self.request.send(buf)
if sent == len(buf):
self.traffic("<")
self.print_traffic("<")
else:
self.traffic("<.")
self.print_traffic("<.")
self.send_parts.insert(0, buf[sent:])
break
......@@ -446,7 +334,7 @@ Sec-WebSocket-Accept: %s\r
bufs = []
tdelta = int(time.time()*1000) - self.start_time
buf = self.client.recv(self.buffer_size)
buf = self.request.recv(self.buffer_size)
if len(buf) == 0:
closed = {'code': 1000, 'reason': "Client closed abruptly"}
return bufs, closed
......@@ -457,12 +345,13 @@ Sec-WebSocket-Accept: %s\r
self.recv_part = None
while buf:
frame = self.decode_hybi(buf, base64=self.base64)
#print("Received buf: %s, frame: %s" % (repr(buf), frame))
frame = self.decode_hybi(buf, base64=self.base64,
logger=self.logger)
#self.msg("Received buf: %s, frame: %s", repr(buf), frame)
if frame['payload'] == None:
# Incomplete/partial frame
self.traffic("}.")
self.print_traffic("}.")
if frame['left'] > 0:
self.recv_part = buf[-frame['left']:]
break
......@@ -472,13 +361,13 @@ Sec-WebSocket-Accept: %s\r
'reason': frame['close_reason']}
break
self.traffic("}")
self.print_traffic("}")
if self.rec:
start = frame['hlen']
end = frame['hlen'] + frame['length']
if frame['masked']:
recbuf = WebSocketServer.unmask(buf, frame['hlen'],
recbuf = WebSocketRequestHandler.unmask(buf, frame['hlen'],
frame['length'])
else:
recbuf = buf[frame['hlen']:frame['hlen'] +
......@@ -501,11 +390,10 @@ Sec-WebSocket-Accept: %s\r
msg = pack(">H%ds" % len(reason), code, reason)
buf, h, t = self.encode_hybi(msg, opcode=0x08, base64=False)
self.client.send(buf)
self.request.send(buf)
def do_websocket_handshake(self, headers, path):
h = self.headers = headers
self.path = path
def do_websocket_handshake(self):
h = self.headers
prot = 'WebSocket-Protocol'
protocols = h.get('Sec-'+prot, h.get(prot, '')).split(',')
......@@ -520,7 +408,8 @@ Sec-WebSocket-Accept: %s\r
if ver in ['7', '8', '13']:
self.version = "hybi-%02d" % int(ver)
else:
raise self.EClose('Unsupported protocol version %s' % ver)
self.send_error(400, "Unsupported protocol version %s" % ver)
return False
key = h['Sec-WebSocket-Key']
......@@ -530,23 +419,320 @@ Sec-WebSocket-Accept: %s\r
elif 'base64' in protocols:
self.base64 = True
else:
raise self.EClose("Client must support 'binary' or 'base64' protocol")
self.send_error(400, "Client must support 'binary' or 'base64' protocol")
return False
# Generate the hash value for the accept header
accept = b64encode(sha1(s2b(key + self.GUID)).digest())
response = self.server_handshake_hybi % b2s(accept)
self.send_response(101, "Switching Protocols")
self.send_header("Upgrade", "websocket")
self.send_header("Connection", "Upgrade")
self.send_header("Sec-WebSocket-Accept", b2s(accept))
if self.base64:
response += "Sec-WebSocket-Protocol: base64\r\n"
self.send_header("Sec-WebSocket-Protocol", "base64")
else:
self.send_header("Sec-WebSocket-Protocol", "binary")
self.end_headers()
return True
else:
self.send_error(400, "Missing Sec-WebSocket-Version header. Hixie protocols not supported.")
return False
def handle_websocket(self):
"""Upgrade a connection to Websocket, if requested. If this succeeds,
new_websocket_client() will be called. Otherwise, False is returned.
"""
if (self.headers.get('upgrade') and
self.headers.get('upgrade').lower() == 'websocket'):
if not self.do_websocket_handshake():
return False
# Indicate to server that a Websocket upgrade was done
self.server.ws_connection = True
# Initialize per client settings
self.send_parts = []
self.recv_part = None
self.start_time = int(time.time()*1000)
# client_address is empty with, say, UNIX domain sockets
client_addr = ""
is_ssl = False
try:
client_addr = self.client_address[0]
is_ssl = self.client_address[2]
except IndexError:
pass
if is_ssl:
self.stype = "SSL/TLS (wss://)"
else:
self.stype = "Plain non-SSL (ws://)"
self.log_message("%s: %s WebSocket connection", client_addr,
self.stype)
self.log_message("%s: Version %s, base64: '%s'", client_addr,
self.version, self.base64)
if self.path != '/':
self.log_message("%s: Path: '%s'", client_addr, self.path)
if self.record:
# Record raw frame data as JavaScript array
fname = "%s.%s" % (self.record,
self.handler_id)
self.log_message("opening record file: %s", fname)
self.rec = open(fname, 'w+')
encoding = "binary"
if self.base64: encoding = "base64"
self.rec.write("var VNC_frame_encoding = '%s';\n"
% encoding)
self.rec.write("var VNC_frame_data = [\n")
try:
self.new_websocket_client()
except self.CClose:
# Close the client
_, exc, _ = sys.exc_info()
self.send_close(exc.args[0], exc.args[1])
return True
else:
return False
def do_GET(self):
"""Handle GET request. Calls handle_websocket(). If unsuccessful,
and web server is enabled, SimpleHTTPRequestHandler.do_GET will be called."""
if not self.handle_websocket():
if self.only_upgrade:
self.send_error(405, "Method Not Allowed")
else:
SimpleHTTPRequestHandler.do_GET(self)
def list_directory(self, path):
if self.file_only:
self.send_error(404, "No such file")
else:
return SimpleHTTPRequestHandler.list_directory(self, path)
def new_websocket_client(self):
""" Do something with a WebSockets client connection. """
raise Exception("WebSocketRequestHandler.new_websocket_client() must be overloaded")
def do_HEAD(self):
if self.only_upgrade:
self.send_error(405, "Method Not Allowed")
else:
SimpleHTTPRequestHandler.do_HEAD(self)
def finish(self):
if self.rec:
self.rec.write("'EOF'];\n")
self.rec.close()
def handle(self):
# When using run_once, we have a single process, so
# we cannot loop in BaseHTTPRequestHandler.handle; we
# must return and handle new connections
if self.run_once:
self.handle_one_request()
else:
SimpleHTTPRequestHandler.handle(self)
def log_request(self, code='-', size='-'):
if self.verbose:
SimpleHTTPRequestHandler.log_request(self, code, size)
class WebSocketServer(object):
"""
WebSockets server class.
As an alternative, the standard library SocketServer can be used
"""
policy_response = """<cross-domain-policy><allow-access-from domain="*" to-ports="*" /></cross-domain-policy>\n"""
log_prefix = "websocket"
# An exception before the WebSocket connection was established
class EClose(Exception):
pass
class Terminate(Exception):
pass
def __init__(self, RequestHandlerClass, listen_host='',
listen_port=None, source_is_ipv6=False,
verbose=False, cert='', key='', ssl_only=None,
daemon=False, record='', web='',
file_only=False,
run_once=False, timeout=0, idle_timeout=0, traffic=False,
tcp_keepalive=True, tcp_keepcnt=None, tcp_keepidle=None,
tcp_keepintvl=None):
# settings
self.RequestHandlerClass = RequestHandlerClass
self.verbose = verbose
self.listen_host = listen_host
self.listen_port = listen_port
self.prefer_ipv6 = source_is_ipv6
self.ssl_only = ssl_only
self.daemon = daemon
self.run_once = run_once
self.timeout = timeout
self.idle_timeout = idle_timeout
self.traffic = traffic
self.launch_time = time.time()
self.ws_connection = False
self.handler_id = 1
self.logger = self.get_logger()
self.tcp_keepalive = tcp_keepalive
self.tcp_keepcnt = tcp_keepcnt
self.tcp_keepidle = tcp_keepidle
self.tcp_keepintvl = tcp_keepintvl
# Make paths settings absolute
self.cert = os.path.abspath(cert)
self.key = self.web = self.record = ''
if key:
self.key = os.path.abspath(key)
if web:
self.web = os.path.abspath(web)
if record:
self.record = os.path.abspath(record)
if self.web:
os.chdir(self.web)
self.only_upgrade = not self.web
# Sanity checks
if not ssl and self.ssl_only:
raise Exception("No 'ssl' module and SSL-only specified")
if self.daemon and not resource:
raise Exception("Module 'resource' required to daemonize")
# Show configuration
self.msg("WebSocket server settings:")
self.msg(" - Listen on %s:%s",
self.listen_host, self.listen_port)
self.msg(" - Flash security policy server")
if self.web:
self.msg(" - Web server. Web root: %s", self.web)
if ssl:
if os.path.exists(self.cert):
self.msg(" - SSL/TLS support")
if self.ssl_only:
self.msg(" - Deny non-SSL/TLS connections")
else:
self.msg(" - No SSL/TLS support (no cert file)")
else:
response += "Sec-WebSocket-Protocol: binary\r\n"
response += "\r\n"
self.msg(" - No SSL/TLS support (no 'ssl' module)")
if self.daemon:
self.msg(" - Backgrounding (daemon)")
if self.record:
self.msg(" - Recording to '%s.*'", self.record)
#
# WebSocketServer static methods
#
@staticmethod
def get_logger():
return logging.getLogger("%s.%s" % (
WebSocketServer.log_prefix,
WebSocketServer.__class__.__name__))
@staticmethod
def socket(host, port=None, connect=False, prefer_ipv6=False,
unix_socket=None, use_ssl=False, tcp_keepalive=True,
tcp_keepcnt=None, tcp_keepidle=None, tcp_keepintvl=None):
""" Resolve a host (and optional port) to an IPv4 or IPv6
address. Create a socket. Bind to it if listen is set,
otherwise connect to it. Return the socket.
"""
flags = 0
if host == '':
host = None
if connect and not (port or unix_socket):
raise Exception("Connect mode requires a port")
if use_ssl and not ssl:
raise Exception("SSL socket requested but Python SSL module not loaded.");
if not connect and use_ssl:
raise Exception("SSL only supported in connect mode (for now)")
if not connect:
flags = flags | socket.AI_PASSIVE
if not unix_socket:
addrs = socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM,
socket.IPPROTO_TCP, flags)
if not addrs:
raise Exception("Could not resolve host '%s'" % host)
addrs.sort(key=lambda x: x[0])
if prefer_ipv6:
addrs.reverse()
sock = socket.socket(addrs[0][0], addrs[0][1])
if tcp_keepalive:
sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
if tcp_keepcnt:
sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPCNT,
tcp_keepcnt)
if tcp_keepidle:
sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPIDLE,
tcp_keepidle)
if tcp_keepintvl:
sock.setsockopt(socket.SOL_TCP, socket.TCP_KEEPINTVL,
tcp_keepintvl)
if connect:
sock.connect(addrs[0][4])
if use_ssl:
sock = ssl.wrap_socket(sock)
else:
raise self.EClose("Missing Sec-WebSocket-Version header. Hixie protocols not supported.")
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(addrs[0][4])
sock.listen(100)
else:
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.connect(unix_socket)
return response
return sock
@staticmethod
def daemonize(keepfd=None, chdir='/'):
os.umask(0)
if chdir:
os.chdir(chdir)
else:
os.chdir('/')
os.setgid(os.getgid()) # relinquish elevations
os.setuid(os.getuid()) # relinquish elevations
# Double fork to daemonize
if os.fork() > 0: os._exit(0) # Parent exits
os.setsid() # Obtain new process group
if os.fork() > 0: os._exit(0) # Parent exits
# Signal handling
signal.signal(signal.SIGTERM, signal.SIG_IGN)
signal.signal(signal.SIGINT, signal.SIG_IGN)
# Close open files
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if maxfd == resource.RLIM_INFINITY: maxfd = 256
for fd in reversed(range(maxfd)):
try:
if fd != keepfd:
os.close(fd)
except OSError:
_, exc, _ = sys.exc_info()
if exc.errno != errno.EBADF: raise
# Redirect I/O to /dev/null
os.dup2(os.open(os.devnull, os.O_RDWR), sys.stdin.fileno())
os.dup2(os.open(os.devnull, os.O_RDWR), sys.stdout.fileno())
os.dup2(os.open(os.devnull, os.O_RDWR), sys.stderr.fileno())
def do_handshake(self, sock, address):
"""
......@@ -565,7 +751,6 @@ Sec-WebSocket-Accept: %s\r
- Send a WebSockets handshake server response.
- Return the socket for this WebSocket client.
"""
stype = ""
ready = select.select([sock], [], [], 3)[0]
......@@ -609,45 +794,38 @@ Sec-WebSocket-Accept: %s\r
else:
raise
self.scheme = "wss"
stype = "SSL/TLS (wss://)"
elif self.ssl_only:
raise self.EClose("non-SSL connection received but disallowed")
else:
retsock = sock
self.scheme = "ws"
stype = "Plain non-SSL (ws://)"
wsh = WSRequestHandler(retsock, address, not self.web)
if wsh.last_code == 101:
# Continue on to handle WebSocket upgrade
pass
elif wsh.last_code == 405:
raise self.EClose("Normal web request received but disallowed")
elif wsh.last_code < 200 or wsh.last_code >= 300:
raise self.EClose(wsh.last_message)
elif self.verbose:
raise self.EClose(wsh.last_message)
else:
raise self.EClose("")
# If the address is like (host, port), we are extending it
# with a flag indicating SSL. Not many other options
# available...
if len(address) == 2:
address = (address[0], address[1], (retsock != sock))
response = self.do_websocket_handshake(wsh.headers, wsh.path)
self.RequestHandlerClass(retsock, address, self)
self.msg("%s: %s WebSocket connection" % (address[0], stype))
self.msg("%s: Version %s, base64: '%s'" % (address[0],
self.version, self.base64))
if self.path != '/':
self.msg("%s: Path: '%s'" % (address[0], self.path))
# Return the WebSockets socket which may be SSL wrapped
return retsock
#
# WebSocketServer logging/output functions
#
# Send server WebSockets handshake response
#self.msg("sending response [%s]" % response)
retsock.send(s2b(response))
def msg(self, *args, **kwargs):
""" Output message as info """
self.logger.log(logging.INFO, *args, **kwargs)
# Return the WebSockets socket which may be SSL wrapped
return retsock
def vmsg(self, *args, **kwargs):
""" Same as msg() but as debug. """
self.logger.log(logging.DEBUG, *args, **kwargs)
def warn(self, *args, **kwargs):
""" Same as msg() but as warning. """
self.logger.log(logging.WARN, *args, **kwargs)
#
......@@ -662,6 +840,12 @@ Sec-WebSocket-Accept: %s\r
#self.vmsg("Running poll()")
pass
def terminate(self):
raise self.Terminate()
def multiprocessing_SIGCHLD(self, sig, stack):
self.vmsg('Reaing zombies, active child count is %s', len(multiprocessing.active_children()))
def fallback_SIGCHLD(self, sig, stack):
# Reap zombies when using os.fork() (python 2.4)
self.vmsg("Got SIGCHLD, reaping zombies")
......@@ -675,95 +859,83 @@ Sec-WebSocket-Accept: %s\r
def do_SIGINT(self, sig, stack):
self.msg("Got SIGINT, exiting")
sys.exit(0)
self.terminate()
def do_SIGTERM(self, sig, stack):
self.msg("Got SIGTERM, exiting")
self.terminate()
def top_new_client(self, startsock, address):
""" Do something with a WebSockets client connection. """
# Initialize per client settings
self.send_parts = []
self.recv_part = None
self.base64 = False
self.rec = None
self.start_time = int(time.time()*1000)
# handler process
client = None
try:
try:
self.client = self.do_handshake(startsock, address)
if self.record:
# Record raw frame data as JavaScript array
fname = "%s.%s" % (self.record,
self.handler_id)
self.msg("opening record file: %s" % fname)
self.rec = open(fname, 'w+')
encoding = "binary"
if self.base64: encoding = "base64"
self.rec.write("var VNC_frame_encoding = '%s';\n"
% encoding)
self.rec.write("var VNC_frame_data = [\n")
self.ws_connection = True
self.new_client()
except self.CClose:
# Close the client
_, exc, _ = sys.exc_info()
if self.client:
self.send_close(exc.args[0], exc.args[1])
client = self.do_handshake(startsock, address)
except self.EClose:
_, exc, _ = sys.exc_info()
# Connection was not a WebSockets connection
if exc.args[0]:
self.msg("%s: %s" % (address[0], exc.args[0]))
except WebSocketServer.Terminate:
raise
except Exception:
_, exc, _ = sys.exc_info()
self.msg("handler exception: %s" % str(exc))
if self.verbose:
self.msg(traceback.format_exc())
self.vmsg("exception", exc_info=True)
finally:
if self.rec:
self.rec.write("'EOF'];\n")
self.rec.close()
if self.client and self.client != startsock:
if client and client != startsock:
# Close the SSL wrapped socket
# Original socket closed by caller
self.client.close()
def new_client(self):
""" Do something with a WebSockets client connection. """
raise("WebSocketServer.new_client() must be overloaded")
client.close()
def start_server(self):
"""
Daemonize if requested. Listen for for connections. Run
do_handshake() method for each connection. If the connection
is a WebSockets client then call new_client() method (which must
is a WebSockets client then call new_websocket_client() method (which must
be overridden) for each new client connection.
"""
lsock = self.socket(self.listen_host, self.listen_port, False, self.prefer_ipv6)
lsock = self.socket(self.listen_host, self.listen_port, False,
self.prefer_ipv6,
tcp_keepalive=self.tcp_keepalive,
tcp_keepcnt=self.tcp_keepcnt,
tcp_keepidle=self.tcp_keepidle,
tcp_keepintvl=self.tcp_keepintvl)
if self.daemon:
self.daemonize(keepfd=lsock.fileno(), chdir=self.web)
self.started() # Some things need to happen after daemonizing
# Allow override of SIGINT
# Allow override of signals
original_signals = {
signal.SIGINT: signal.getsignal(signal.SIGINT),
signal.SIGTERM: signal.getsignal(signal.SIGTERM),
signal.SIGCHLD: signal.getsignal(signal.SIGCHLD),
}
signal.signal(signal.SIGINT, self.do_SIGINT)
signal.signal(signal.SIGTERM, self.do_SIGTERM)
if not multiprocessing:
# os.fork() (python 2.4) child reaper
signal.signal(signal.SIGCHLD, self.fallback_SIGCHLD)
else:
# make sure that _cleanup is called when children die
# by calling active_children on SIGCHLD
signal.signal(signal.SIGCHLD, self.multiprocessing_SIGCHLD)
last_active_time = self.launch_time
try:
while True:
try:
try:
self.client = None
startsock = None
pid = err = 0
child_count = 0
if multiprocessing and self.idle_timeout:
if multiprocessing:
# Collect zombie child processes
child_count = len(multiprocessing.active_children())
time_elapsed = time.time() - self.launch_time
......@@ -793,6 +965,8 @@ Sec-WebSocket-Accept: %s\r
startsock, address = lsock.accept()
else:
continue
except self.Terminate:
raise
except Exception:
_, exc, _ = sys.exc_info()
if hasattr(exc, 'errno'):
......@@ -833,55 +1007,24 @@ Sec-WebSocket-Accept: %s\r
# parent process
self.handler_id += 1
except KeyboardInterrupt:
_, exc, _ = sys.exc_info()
print("In KeyboardInterrupt")
pass
except SystemExit:
_, exc, _ = sys.exc_info()
print("In SystemExit")
except (self.Terminate, SystemExit, KeyboardInterrupt):
self.msg("In exit")
break
except Exception:
_, exc, _ = sys.exc_info()
self.msg("handler exception: %s" % str(exc))
if self.verbose:
self.msg(traceback.format_exc())
self.msg("handler exception: %s", str(exc))
self.vmsg("exception", exc_info=True)
finally:
if startsock:
startsock.close()
finally:
# Close listen port
self.vmsg("Closing socket listening at %s:%s"
% (self.listen_host, self.listen_port))
self.vmsg("Closing socket listening at %s:%s",
self.listen_host, self.listen_port)
lsock.close()
# Restore signals
for sig, func in original_signals.items():
signal.signal(sig, func)
# HTTP handler with WebSocket upgrade support
class WSRequestHandler(SimpleHTTPRequestHandler):
def __init__(self, req, addr, only_upgrade=False):
self.only_upgrade = only_upgrade # only allow upgrades
SimpleHTTPRequestHandler.__init__(self, req, addr, object())
def do_GET(self):
if (self.headers.get('upgrade') and
self.headers.get('upgrade').lower() == 'websocket'):
# Just indicate that an WebSocket upgrade is needed
self.last_code = 101
self.last_message = "101 Switching Protocols"
elif self.only_upgrade:
# Normal web request responses are disabled
self.last_code = 405
self.last_message = "405 Method Not Allowed"
else:
SimpleHTTPRequestHandler.do_GET(self)
def send_response(self, code, message=None):
# Save the status code
self.last_code = code
SimpleHTTPRequestHandler.send_response(self, code, message)
def log_message(self, f, *args):
# Save instead of printing
self.last_message = f % args
utils/websockify
View file @ 082027dc
......@@ -11,7 +11,11 @@ as taken from http://docs.python.org/dev/library/ssl.html#certificates
'''
import signal, socket, optparse, time, os, sys, subprocess
import signal, socket, optparse, time, os, sys, subprocess, logging
try: from socketserver import ForkingMixIn
except: from SocketServer import ForkingMixIn
try: from http.server import HTTPServer
except: from BaseHTTPServer import HTTPServer
from select import select
import websocket
try:
......@@ -20,15 +24,7 @@ except:
from cgi import parse_qs
from urlparse import urlparse
class WebSocketProxy(websocket.WebSocketServer):
"""
Proxy traffic to and from a WebSockets client to a normal TCP
socket server target. All traffic to/from the client is base64
encoded/decoded to allow binary data to be sent/received to/from
the target.
"""
buffer_size = 65536
class ProxyRequestHandler(websocket.WebSocketRequestHandler):
traffic_legend = """
Traffic Legend:
......@@ -42,148 +38,33 @@ Traffic Legend:
<. - Client send partial
"""
def __init__(self, *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.target_cfg = kwargs.pop('target_cfg', None)
# Last 3 timestamps command was run
self.wrap_times = [0, 0, 0]
if self.wrap_cmd:
rebinder_path = ['./', os.path.dirname(sys.argv[0])]
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)})
if self.target_cfg:
self.target_cfg = os.path.abspath(self.target_cfg)
websocket.WebSocketServer.__init__(self, *args, **kwargs)
def run_wrap_cmd(self):
print("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.target_cfg:
msg = " - proxying from %s:%s to targets in %s" % (
self.listen_host, self.listen_port, self.target_cfg)
else:
msg = " - proxying from %s:%s to %s" % (
self.listen_host, self.listen_port, dst_string)
if self.ssl_target:
msg += " (using SSL)"
print(msg + "\n")
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:
print("Command respawning too fast")
self.spawn_message = False
else:
self.run_wrap_cmd()
#
# Routines above this point are run in the master listener
# process.
#
#
# Routines below this point are connection handler routines and
# will be run in a separate forked process for each connection.
#
def new_client(self):
def new_websocket_client(self):
"""
Called after a new WebSocket connection has been established.
"""
# Checks if we receive a token, and look
# for a valid target for it then
if self.target_cfg:
(self.target_host, self.target_port) = self.get_target(self.target_cfg, self.path)
if self.server.target_cfg:
(self.server.target_host, self.server.target_port) = self.get_target(self.server.target_cfg, self.path)
# Connect to the target
if self.wrap_cmd:
msg = "connecting to command: '%s' (port %s)" % (" ".join(self.wrap_cmd), self.target_port)
elif self.unix_target:
msg = "connecting to unix socket: %s" % self.unix_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.target_host, self.target_port)
self.server.target_host, self.server.target_port)
if self.ssl_target:
if self.server.ssl_target:
msg += " (using SSL)"
self.msg(msg)
self.log_message(msg)
tsock = self.socket(self.target_host, self.target_port,
connect=True, use_ssl=self.ssl_target, unix_socket=self.unix_target)
tsock = websocket.WebSocketServer.socket(self.server.target_host,
self.server.target_port,
connect=True, use_ssl=self.server.ssl_target, unix_socket=self.server.unix_target)
if self.verbose and not self.daemon:
print(self.traffic_legend)
self.print_traffic(self.traffic_legend)
# Start proxying
try:
......@@ -192,8 +73,9 @@ Traffic Legend:
if tsock:
tsock.shutdown(socket.SHUT_RDWR)
tsock.close()
self.vmsg("%s:%s: Closed target" %(
self.target_host, self.target_port))
if self.verbose:
self.log_message("%s:%s: Closed target",
self.server.target_host, self.server.target_port)
raise
def get_target(self, target_cfg, path):
......@@ -242,31 +124,32 @@ Traffic Legend:
cqueue = []
c_pend = 0
tqueue = []
rlist = [self.client, target]
rlist = [self.request, target]
while True:
wlist = []
if tqueue: wlist.append(target)
if cqueue or c_pend: wlist.append(self.client)
if cqueue or c_pend: wlist.append(self.request)
ins, outs, excepts = select(rlist, wlist, [], 1)
if excepts: raise Exception("Socket exception")
if self.client in outs:
if self.request in outs:
# Send queued target data to the client
c_pend = self.send_frames(cqueue)
cqueue = []
if self.client in ins:
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?
self.vmsg("%s:%s: Client closed connection" %(
self.target_host, self.target_port))
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'])
......@@ -275,24 +158,139 @@ Traffic Legend:
dat = tqueue.pop(0)
sent = target.send(dat)
if sent == len(dat):
self.traffic(">")
self.print_traffic(">")
else:
# requeue the remaining data
tqueue.insert(0, dat[sent:])
self.traffic(".>")
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:
self.vmsg("%s:%s: Target closed connection" %(
self.target_host, self.target_port))
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.traffic("{")
self.print_traffic("{")
class WebSocketProxy(websocket.WebSocketServer):
"""
Proxy traffic to and from a WebSockets client to a normal TCP
socket server target. All traffic to/from the client is base64
encoded/decoded to allow binary data to be sent/received to/from
the 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.target_cfg = kwargs.pop('target_cfg', 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)})
websocket.WebSocketServer.__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.target_cfg:
msg = " - proxying from %s:%s to targets in %s" % (
self.listen_host, self.listen_port, self.target_cfg)
else:
msg = " - proxying from %s:%s to %s" % (
self.listen_host, self.listen_port, 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():
......@@ -301,14 +299,28 @@ def _subprocess_setup():
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
def logger_init():
logger = logging.getLogger(WebSocketProxy.log_prefix)
logger.propagate = False
logger.setLevel(logging.INFO)
h = logging.StreamHandler()
h.setLevel(logging.DEBUG)
h.setFormatter(logging.Formatter("%(message)s"))
logger.addHandler(h)
def websockify_init():
logger_init()
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 and per frame traffic")
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",
......@@ -345,8 +357,13 @@ def websockify_init():
help="Configuration file containing valid targets "
"in the form 'token: host:port' or, alternatively, a "
"directory containing configuration files of this form")
parser.add_option("--libserver", action="store_true",
help="use Python library SocketServer engine")
(opts, args) = parser.parse_args()
if opts.verbose:
logging.getLogger(WebSocketProxy.log_prefix).setLevel(logging.DEBUG)
# Sanity checks
if len(args) < 2 and not (opts.target_cfg or opts.unix_target):
parser.error("Too few arguments")
......@@ -385,9 +402,70 @@ def websockify_init():
try: opts.target_port = int(opts.target_port)
except: parser.error("Error parsing target port")
# Transform to absolute path as daemon may chdir
if opts.target_cfg:
opts.target_cfg = os.path.abspath(opts.target_cfg)
# 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(ForkingMixIn, 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.target_cfg = kwargs.pop('target_cfg', None)
self.daemon = False
self.target_cfg = None
# 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
ForkingMixIn.process_request(self, request, client_address)
if __name__ == '__main__':
websockify_init()
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