Created
March 18, 2016 08:36
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Fix for 'error 1006'
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| #!/usr/bin/env python | |
| ''' | |
| Python WebSocket library with support for "wss://" encryption. | |
| Copyright 2011 Joel Martin | |
| Licensed under LGPL version 3 (see docs/LICENSE.LGPL-3) | |
| Supports following protocol versions: | |
| - http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07 | |
| - http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10 | |
| - http://tools.ietf.org/html/rfc6455 | |
| 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 os, sys, time, errno, signal, socket, select, logging | |
| import array, struct | |
| from base64 import b64encode, b64decode | |
| # Imports that vary by python version | |
| # python 3.0 differences | |
| if sys.hexversion > 0x3000000: | |
| b2s = lambda buf: buf.decode('latin_1') | |
| s2b = lambda s: s.encode('latin_1') | |
| s2a = lambda s: s | |
| else: | |
| b2s = lambda buf: buf # No-op | |
| s2b = lambda s: s # No-op | |
| s2a = lambda s: [ord(c) for c in s] | |
| try: from io import StringIO | |
| except: from cStringIO import StringIO | |
| try: from http.server import SimpleHTTPRequestHandler | |
| except: from SimpleHTTPServer import SimpleHTTPRequestHandler | |
| # python 2.6 differences | |
| try: from hashlib import sha1 | |
| except: from sha import sha as sha1 | |
| # python 2.5 differences | |
| try: | |
| from struct import pack, unpack_from | |
| except: | |
| from struct import pack | |
| def unpack_from(fmt, buf, offset=0): | |
| slice = buffer(buf, offset, struct.calcsize(fmt)) | |
| return struct.unpack(fmt, slice) | |
| # Degraded functionality if these imports are missing | |
| for mod, msg in [('numpy', 'HyBi protocol will be slower'), | |
| ('ssl', 'TLS/SSL/wss is disabled'), | |
| ('multiprocessing', 'Multi-Processing is disabled'), | |
| ('resource', 'daemonizing is disabled')]: | |
| try: | |
| globals()[mod] = __import__(mod) | |
| 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 | |
| # HTTP handler with WebSocket upgrade support | |
| class WebSocketRequestHandler(SimpleHTTPRequestHandler): | |
| """ | |
| 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 | |
| GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11" | |
| server_version = "WebSockify" | |
| protocol_version = "HTTP/1.1" | |
| # An exception while the WebSocket client was connected | |
| class CClose(Exception): | |
| pass | |
| 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) | |
| self.logger = getattr(server, "logger", None) | |
| if self.logger is None: | |
| self.logger = WebSocketServer.get_logger() | |
| SimpleHTTPRequestHandler.__init__(self, req, addr, server) | |
| @staticmethod | |
| def unmask(buf, hlen, plen): | |
| pstart = hlen + 4 | |
| pend = pstart + plen | |
| if numpy: | |
| b = c = s2b('') | |
| if plen >= 4: | |
| mask = numpy.frombuffer(buf, dtype=numpy.dtype('<u4'), | |
| offset=hlen, count=1) | |
| data = numpy.frombuffer(buf, dtype=numpy.dtype('<u4'), | |
| offset=pstart, count=int(plen / 4)) | |
| #b = numpy.bitwise_xor(data, mask).data | |
| b = numpy.bitwise_xor(data, mask).tostring() | |
| if plen % 4: | |
| #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'), | |
| offset=pend - (plen % 4), | |
| count=(plen % 4)) | |
| c = numpy.bitwise_xor(data, mask).tostring() | |
| return b + c | |
| else: | |
| # Slower fallback | |
| mask = buf[hlen:hlen+4] | |
| data = array.array('B') | |
| mask = s2a(mask) | |
| data.fromstring(buf[pstart:pend]) | |
| for i in range(len(data)): | |
| data[i] ^= mask[i % 4] | |
| return data.tostring() | |
| @staticmethod | |
| def encode_hybi(buf, opcode, base64=False): | |
| """ Encode a HyBi style WebSocket frame. | |
| Optional opcode: | |
| 0x0 - continuation | |
| 0x1 - text frame (base64 encode buf) | |
| 0x2 - binary frame (use raw buf) | |
| 0x8 - connection close | |
| 0x9 - ping | |
| 0xA - pong | |
| """ | |
| if base64: | |
| buf = b64encode(buf) | |
| b1 = 0x80 | (opcode & 0x0f) # FIN + opcode | |
| payload_len = len(buf) | |
| if payload_len <= 125: | |
| header = pack('>BB', b1, payload_len) | |
| elif payload_len > 125 and payload_len < 65536: | |
| header = pack('>BBH', b1, 126, payload_len) | |
| elif payload_len >= 65536: | |
| header = pack('>BBQ', b1, 127, payload_len) | |
| #self.msg("Encoded: %s", repr(header + buf)) | |
| return header + buf, len(header), 0 | |
| @staticmethod | |
| def decode_hybi(buf, base64=False, logger=None): | |
| """ Decode HyBi style WebSocket packets. | |
| Returns: | |
| {'fin' : 0_or_1, | |
| 'opcode' : number, | |
| 'masked' : boolean, | |
| 'hlen' : header_bytes_number, | |
| 'length' : payload_bytes_number, | |
| 'payload' : decoded_buffer, | |
| 'left' : bytes_left_number, | |
| 'close_code' : number, | |
| 'close_reason' : string} | |
| """ | |
| f = {'fin' : 0, | |
| 'opcode' : 0, | |
| 'masked' : False, | |
| 'hlen' : 2, | |
| 'length' : 0, | |
| 'payload' : None, | |
| 'left' : 0, | |
| 'close_code' : 1000, | |
| 'close_reason' : ''} | |
| if logger is None: | |
| logger = WebSocketServer.get_logger() | |
| blen = len(buf) | |
| f['left'] = blen | |
| if blen < f['hlen']: | |
| return f # Incomplete frame header | |
| b1, b2 = unpack_from(">BB", buf) | |
| f['opcode'] = b1 & 0x0f | |
| f['fin'] = (b1 & 0x80) >> 7 | |
| f['masked'] = (b2 & 0x80) >> 7 | |
| f['length'] = b2 & 0x7f | |
| if f['length'] == 126: | |
| f['hlen'] = 4 | |
| if blen < f['hlen']: | |
| return f # Incomplete frame header | |
| (f['length'],) = unpack_from('>xxH', buf) | |
| elif f['length'] == 127: | |
| f['hlen'] = 10 | |
| if blen < f['hlen']: | |
| return f # Incomplete frame header | |
| (f['length'],) = unpack_from('>xxQ', buf) | |
| full_len = f['hlen'] + f['masked'] * 4 + f['length'] | |
| if blen < full_len: # Incomplete frame | |
| return f # Incomplete frame header | |
| # Number of bytes that are part of the next frame(s) | |
| f['left'] = blen - full_len | |
| # Process 1 frame | |
| if f['masked']: | |
| # unmask payload | |
| f['payload'] = WebSocketRequestHandler.unmask(buf, f['hlen'], | |
| f['length']) | |
| else: | |
| 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: | |
| logger.exception("Exception while b64decoding buffer: %s" % | |
| (repr(buf))) | |
| raise | |
| if f['opcode'] == 0x08: | |
| if f['length'] >= 2: | |
| f['close_code'] = unpack_from(">H", f['payload'])[0] | |
| if f['length'] > 3: | |
| f['close_reason'] = f['payload'][2:] | |
| return f | |
| # | |
| # WebSocketRequestHandler logging/output functions | |
| # | |
| def print_traffic(self, token="."): | |
| """ Show traffic flow mode. """ | |
| if self.traffic: | |
| sys.stdout.write(token) | |
| sys.stdout.flush() | |
| def msg(self, msg, *args, **kwargs): | |
| """ Output message with handler_id prefix. """ | |
| prefix = "% 3d: " % self.handler_id | |
| self.logger.log(logging.INFO, "%s%s" % (prefix, msg), *args, **kwargs) | |
| 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 WebSocketRequestHandler methods | |
| # | |
| def send_frames(self, bufs=None): | |
| """ Encode and send WebSocket frames. Any frames already | |
| queued will be sent first. If buf is not set then only queued | |
| frames will be sent. Returns the number of pending frames that | |
| could not be fully sent. If returned pending frames is greater | |
| than 0, then the caller should call again when the socket is | |
| ready. """ | |
| tdelta = int(time.time()*1000) - self.start_time | |
| if bufs: | |
| for buf in bufs: | |
| if self.base64: | |
| encbuf, lenhead, lentail = self.encode_hybi(buf, opcode=1, base64=True) | |
| else: | |
| encbuf, lenhead, lentail = self.encode_hybi(buf, opcode=2, base64=False) | |
| if self.rec: | |
| self.rec.write("%s,\n" % | |
| repr("{%s{" % tdelta | |
| + encbuf[lenhead:len(encbuf)-lentail])) | |
| self.send_parts.append(encbuf) | |
| while self.send_parts: | |
| # Send pending frames | |
| buf = self.send_parts.pop(0) | |
| sent = self.request.send(buf) | |
| if sent == len(buf): | |
| self.print_traffic("<") | |
| else: | |
| self.print_traffic("<.") | |
| self.send_parts.insert(0, buf[sent:]) | |
| break | |
| return len(self.send_parts) | |
| def recv_frames(self): | |
| """ Receive and decode WebSocket frames. | |
| Returns: | |
| (bufs_list, closed_string) | |
| """ | |
| closed = False | |
| bufs = [] | |
| tdelta = int(time.time()*1000) - self.start_time | |
| buf = self.request.recv(self.buffer_size) | |
| if len(buf) == 0: | |
| closed = {'code': 1000, 'reason': "Client closed abruptly"} | |
| return bufs, closed | |
| if self.recv_part: | |
| # Add partially received frames to current read buffer | |
| buf = self.recv_part + buf | |
| self.recv_part = None | |
| while buf: | |
| 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.print_traffic("}.") | |
| if frame['left'] > 0: | |
| self.recv_part = buf[-frame['left']:] | |
| break | |
| else: | |
| if frame['opcode'] == 0x8: # connection close | |
| closed = {'code': frame['close_code'], | |
| 'reason': frame['close_reason']} | |
| break | |
| elif frame['opcode'] == 0xA: # pong | |
| return [], False | |
| self.print_traffic("}") | |
| if self.rec: | |
| start = frame['hlen'] | |
| end = frame['hlen'] + frame['length'] | |
| if frame['masked']: | |
| recbuf = WebSocketRequestHandler.unmask(buf, frame['hlen'], | |
| frame['length']) | |
| else: | |
| recbuf = buf[frame['hlen']:frame['hlen'] + | |
| frame['length']] | |
| self.rec.write("%s,\n" % | |
| repr("}%s}" % tdelta + recbuf)) | |
| bufs.append(frame['payload']) | |
| if frame['left']: | |
| buf = buf[-frame['left']:] | |
| else: | |
| buf = '' | |
| return bufs, closed | |
| def send_close(self, code=1000, reason=''): | |
| """ Send a WebSocket orderly close frame. """ | |
| msg = pack(">H%ds" % len(reason), code, reason) | |
| buf, h, t = self.encode_hybi(msg, opcode=0x08, base64=False) | |
| self.request.send(buf) | |
| def do_websocket_handshake(self): | |
| h = self.headers | |
| prot = 'WebSocket-Protocol' | |
| protocols = h.get('Sec-'+prot, h.get(prot, '')).split(',') | |
| ver = h.get('Sec-WebSocket-Version') | |
| if ver: | |
| # HyBi/IETF version of the protocol | |
| # HyBi-07 report version 7 | |
| # HyBi-08 - HyBi-12 report version 8 | |
| # HyBi-13 reports version 13 | |
| if ver in ['7', '8', '13']: | |
| self.version = "hybi-%02d" % int(ver) | |
| else: | |
| self.send_error(400, "Unsupported protocol version %s" % ver) | |
| return False | |
| key = h['Sec-WebSocket-Key'] | |
| # Choose binary if client supports it | |
| if 'binary' in protocols: | |
| self.base64 = False | |
| elif 'base64' in protocols: | |
| self.base64 = True | |
| else: | |
| 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()) | |
| 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: | |
| 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: | |
| 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: | |
| 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 | |
| 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): | |
| """ | |
| do_handshake does the following: | |
| - Peek at the first few bytes from the socket. | |
| - If the connection is Flash policy request then answer it, | |
| close the socket and return. | |
| - If the connection is an HTTPS/SSL/TLS connection then SSL | |
| wrap the socket. | |
| - Read from the (possibly wrapped) socket. | |
| - If we have received a HTTP GET request and the webserver | |
| functionality is enabled, answer it, close the socket and | |
| return. | |
| - Assume we have a WebSockets connection, parse the client | |
| handshake data. | |
| - Send a WebSockets handshake server response. | |
| - Return the socket for this WebSocket client. | |
| """ | |
| ready = select.select([sock], [], [], 3)[0] | |
| if not ready: | |
| raise self.EClose("ignoring socket not ready") | |
| # Peek, but do not read the data so that we have a opportunity | |
| # to SSL wrap the socket first | |
| handshake = sock.recv(1024, socket.MSG_PEEK) | |
| #self.msg("Handshake [%s]" % handshake) | |
| if handshake == "": | |
| raise self.EClose("ignoring empty handshake") | |
| elif handshake.startswith(s2b("<policy-file-request/>")): | |
| # Answer Flash policy request | |
| handshake = sock.recv(1024) | |
| sock.send(s2b(self.policy_response)) | |
| raise self.EClose("Sending flash policy response") | |
| elif handshake[0] in ("\x16", "\x80", 22, 128): | |
| # SSL wrap the connection | |
| if not ssl: | |
| raise self.EClose("SSL connection but no 'ssl' module") | |
| if not os.path.exists(self.cert): | |
| raise self.EClose("SSL connection but '%s' not found" | |
| % self.cert) | |
| retsock = None | |
| try: | |
| retsock = ssl.wrap_socket( | |
| sock, | |
| server_side=True, | |
| certfile=self.cert, | |
| keyfile=self.key) | |
| except ssl.SSLError: | |
| _, x, _ = sys.exc_info() | |
| if x.args[0] == ssl.SSL_ERROR_EOF: | |
| if len(x.args) > 1: | |
| raise self.EClose(x.args[1]) | |
| else: | |
| raise self.EClose("Got SSL_ERROR_EOF") | |
| else: | |
| raise | |
| elif self.ssl_only: | |
| raise self.EClose("non-SSL connection received but disallowed") | |
| else: | |
| retsock = sock | |
| # 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)) | |
| self.RequestHandlerClass(retsock, address, self) | |
| # Return the WebSockets socket which may be SSL wrapped | |
| return retsock | |
| # | |
| # WebSocketServer logging/output functions | |
| # | |
| def msg(self, *args, **kwargs): | |
| """ Output message as info """ | |
| self.logger.log(logging.INFO, *args, **kwargs) | |
| 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) | |
| # | |
| # Events that can/should be overridden in sub-classes | |
| # | |
| def started(self): | |
| """ Called after WebSockets startup """ | |
| self.vmsg("WebSockets server started") | |
| def poll(self): | |
| """ Run periodically while waiting for connections. """ | |
| #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") | |
| try: | |
| result = os.waitpid(-1, os.WNOHANG) | |
| while result[0]: | |
| self.vmsg("Reaped child process %s" % result[0]) | |
| result = os.waitpid(-1, os.WNOHANG) | |
| except (OSError): | |
| pass | |
| def do_SIGINT(self, sig, stack): | |
| self.msg("Got SIGINT, exiting") | |
| 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. """ | |
| # handler process | |
| client = None | |
| try: | |
| try: | |
| 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)) | |
| self.vmsg("exception", exc_info=True) | |
| finally: | |
| if client and client != startsock: | |
| # Close the SSL wrapped socket | |
| # Original socket closed by caller | |
| 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_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, | |
| 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 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: | |
| startsock = None | |
| pid = err = 0 | |
| child_count = 0 | |
| if multiprocessing: | |
| # Collect zombie child processes | |
| child_count = len(multiprocessing.active_children()) | |
| time_elapsed = time.time() - self.launch_time | |
| if self.timeout and time_elapsed > self.timeout: | |
| self.msg('listener exit due to --timeout %s' | |
| % self.timeout) | |
| break | |
| if self.idle_timeout: | |
| idle_time = 0 | |
| if child_count == 0: | |
| idle_time = time.time() - last_active_time | |
| else: | |
| idle_time = 0 | |
| last_active_time = time.time() | |
| if idle_time > self.idle_timeout and child_count == 0: | |
| self.msg('listener exit due to --idle-timeout %s' | |
| % self.idle_timeout) | |
| break | |
| try: | |
| self.poll() | |
| ready = select.select([lsock], [], [], 1)[0] | |
| if lsock in ready: | |
| startsock, address = lsock.accept() | |
| else: | |
| continue | |
| except self.Terminate: | |
| raise | |
| except Exception: | |
| _, exc, _ = sys.exc_info() | |
| if hasattr(exc, 'errno'): | |
| err = exc.errno | |
| elif hasattr(exc, 'args'): | |
| err = exc.args[0] | |
| else: | |
| err = exc[0] | |
| if err == errno.EINTR: | |
| self.vmsg("Ignoring interrupted syscall") | |
| continue | |
| else: | |
| raise | |
| if self.run_once: | |
| # Run in same process if run_once | |
| self.top_new_client(startsock, address) | |
| if self.ws_connection : | |
| self.msg('%s: exiting due to --run-once' | |
| % address[0]) | |
| break | |
| elif multiprocessing: | |
| self.vmsg('%s: new handler Process' % address[0]) | |
| p = multiprocessing.Process( | |
| target=self.top_new_client, | |
| args=(startsock, address)) | |
| p.start() | |
| # child will not return | |
| else: | |
| # python 2.4 | |
| self.vmsg('%s: forking handler' % address[0]) | |
| pid = os.fork() | |
| if pid == 0: | |
| # child handler process | |
| self.top_new_client(startsock, address) | |
| break # child process exits | |
| # parent process | |
| self.handler_id += 1 | |
| except (self.Terminate, SystemExit, KeyboardInterrupt): | |
| self.msg("In exit") | |
| break | |
| except Exception: | |
| 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) | |
| lsock.close() | |
| # Restore signals | |
| for sig, func in original_signals.items(): | |
| signal.signal(sig, func) | |
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