/usr/share/pyshared/mod_pywebsocket/standalone.py is in python-mod-pywebsocket 0.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright 2011, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Standalone WebSocket server.
Use this server to run mod_pywebsocket without Apache HTTP Server.
Usage:
python standalone.py [-p <ws_port>] [-w <websock_handlers>]
[-s <scan_dir>]
[-d <document_root>]
[-m <websock_handlers_map_file>]
... for other options, see _main below ...
<ws_port> is the port number to use for ws:// connection.
<document_root> is the path to the root directory of HTML files.
<websock_handlers> is the path to the root directory of WebSocket handlers.
See __init__.py for details of <websock_handlers> and how to write WebSocket
handlers. If this path is relative, <document_root> is used as the base.
<scan_dir> is a path under the root directory. If specified, only the
handlers under scan_dir are scanned. This is useful in saving scan time.
Note:
This server is derived from SocketServer.ThreadingMixIn. Hence a thread is
used for each request.
SECURITY WARNING: This uses CGIHTTPServer and CGIHTTPServer is not secure.
It may execute arbitrary Python code or external programs. It should not be
used outside a firewall.
"""
import BaseHTTPServer
import CGIHTTPServer
import SimpleHTTPServer
import SocketServer
import httplib
import logging
import logging.handlers
import optparse
import os
import re
import select
import socket
import sys
import threading
_HAS_OPEN_SSL = False
try:
import OpenSSL.SSL
_HAS_OPEN_SSL = True
except ImportError:
pass
from mod_pywebsocket import common
from mod_pywebsocket import dispatch
from mod_pywebsocket import handshake
from mod_pywebsocket import http_header_util
from mod_pywebsocket import memorizingfile
from mod_pywebsocket import util
_DEFAULT_LOG_MAX_BYTES = 1024 * 256
_DEFAULT_LOG_BACKUP_COUNT = 5
_DEFAULT_REQUEST_QUEUE_SIZE = 128
# 1024 is practically large enough to contain WebSocket handshake lines.
_MAX_MEMORIZED_LINES = 1024
class _StandaloneConnection(object):
"""Mimic mod_python mp_conn."""
def __init__(self, request_handler):
"""Construct an instance.
Args:
request_handler: A WebSocketRequestHandler instance.
"""
self._request_handler = request_handler
def get_local_addr(self):
"""Getter to mimic mp_conn.local_addr."""
return (self._request_handler.server.server_name,
self._request_handler.server.server_port)
local_addr = property(get_local_addr)
def get_remote_addr(self):
"""Getter to mimic mp_conn.remote_addr.
Setting the property in __init__ won't work because the request
handler is not initialized yet there."""
return self._request_handler.client_address
remote_addr = property(get_remote_addr)
def write(self, data):
"""Mimic mp_conn.write()."""
return self._request_handler.wfile.write(data)
def read(self, length):
"""Mimic mp_conn.read()."""
return self._request_handler.rfile.read(length)
def get_memorized_lines(self):
"""Get memorized lines."""
return self._request_handler.rfile.get_memorized_lines()
class _StandaloneRequest(object):
"""Mimic mod_python request."""
def __init__(self, request_handler, use_tls):
"""Construct an instance.
Args:
request_handler: A WebSocketRequestHandler instance.
"""
self._logger = util.get_class_logger(self)
self._request_handler = request_handler
self.connection = _StandaloneConnection(request_handler)
self._use_tls = use_tls
self.headers_in = request_handler.headers
def get_uri(self):
"""Getter to mimic request.uri."""
return self._request_handler.path
uri = property(get_uri)
def get_method(self):
"""Getter to mimic request.method."""
return self._request_handler.command
method = property(get_method)
def is_https(self):
"""Mimic request.is_https()."""
return self._use_tls
def _drain_received_data(self):
"""Don't use this method from WebSocket handler. Drains unread data
in the receive buffer.
"""
raw_socket = self._request_handler.connection
drained_data = util.drain_received_data(raw_socket)
if drained_data:
self._logger.debug(
'Drained data following close frame: %r', drained_data)
class WebSocketServer(SocketServer.ThreadingMixIn, BaseHTTPServer.HTTPServer):
"""HTTPServer specialized for WebSocket."""
# Overrides SocketServer.ThreadingMixIn.daemon_threads
daemon_threads = True
# Overrides BaseHTTPServer.HTTPServer.allow_reuse_address
allow_reuse_address = True
def __init__(self, options):
"""Override SocketServer.TCPServer.__init__ to set SSL enabled
socket object to self.socket before server_bind and server_activate,
if necessary.
"""
self._logger = util.get_class_logger(self)
self.request_queue_size = options.request_queue_size
self.__ws_is_shut_down = threading.Event()
self.__ws_serving = False
SocketServer.BaseServer.__init__(
self, (options.server_host, options.port), WebSocketRequestHandler)
# Expose the options object to allow handler objects access it. We name
# it with websocket_ prefix to avoid conflict.
self.websocket_server_options = options
self._create_sockets()
self.server_bind()
self.server_activate()
def _create_sockets(self):
self.server_name, self.server_port = self.server_address
self._sockets = []
if not self.server_name:
# On platforms that doesn't support IPv6, the first bind fails.
# On platforms that supports IPv6
# - If it binds both IPv4 and IPv6 on call with AF_INET6, the
# first bind succeeds and the second fails (we'll see 'Address
# already in use' error).
# - If it binds only IPv6 on call with AF_INET6, both call are
# expected to succeed to listen both protocol.
addrinfo_array = [
(socket.AF_INET6, socket.SOCK_STREAM, '', '', ''),
(socket.AF_INET, socket.SOCK_STREAM, '', '', '')]
else:
addrinfo_array = socket.getaddrinfo(self.server_name,
self.server_port,
socket.AF_UNSPEC,
socket.SOCK_STREAM,
socket.IPPROTO_TCP)
for addrinfo in addrinfo_array:
self._logger.info('Create socket on: %r', addrinfo)
family, socktype, proto, canonname, sockaddr = addrinfo
try:
socket_ = socket.socket(family, socktype)
except Exception, e:
self._logger.info('Skip by failure: %r', e)
continue
if self.websocket_server_options.use_tls:
ctx = OpenSSL.SSL.Context(OpenSSL.SSL.SSLv23_METHOD)
ctx.use_privatekey_file(
self.websocket_server_options.private_key)
ctx.use_certificate_file(
self.websocket_server_options.certificate)
socket_ = OpenSSL.SSL.Connection(ctx, socket_)
self._sockets.append((socket_, addrinfo))
def server_bind(self):
"""Override SocketServer.TCPServer.server_bind to enable multiple
sockets bind.
"""
failed_sockets = []
for socketinfo in self._sockets:
socket_, addrinfo = socketinfo
self._logger.info('Bind on: %r', addrinfo)
if self.allow_reuse_address:
socket_.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
socket_.bind(self.server_address)
except Exception, e:
self._logger.info('Skip by failure: %r', e)
socket_.close()
failed_sockets.append(socketinfo)
for socketinfo in failed_sockets:
self._sockets.remove(socketinfo)
def server_activate(self):
"""Override SocketServer.TCPServer.server_activate to enable multiple
sockets listen.
"""
failed_sockets = []
for socketinfo in self._sockets:
socket_, addrinfo = socketinfo
self._logger.info('Listen on: %r', addrinfo)
try:
socket_.listen(self.request_queue_size)
except Exception, e:
self._logger.info('Skip by failure: %r', e)
socket_.close()
failed_sockets.append(socketinfo)
for socketinfo in failed_sockets:
self._sockets.remove(socketinfo)
def server_close(self):
"""Override SocketServer.TCPServer.server_close to enable multiple
sockets close.
"""
for socketinfo in self._sockets:
socket_, addrinfo = socketinfo
self._logger.info('Close on: %r', addrinfo)
socket_.close()
def fileno(self):
"""Override SocketServer.TCPServer.fileno."""
self._logger.critical('Not supported: fileno')
return self._sockets[0][0].fileno()
def handle_error(self, rquest, client_address):
"""Override SocketServer.handle_error."""
self._logger.error(
'Exception in processing request from: %r\n%s',
client_address,
util.get_stack_trace())
# Note: client_address is a tuple.
def serve_forever(self, poll_interval=0.5):
"""Override SocketServer.BaseServer.serve_forever."""
self.__ws_serving = True
self.__ws_is_shut_down.clear()
handle_request = self.handle_request
if hasattr(self, '_handle_request_noblock'):
handle_request = self._handle_request_noblock
else:
self._logger.warning('Fallback to blocking request handler')
try:
while self.__ws_serving:
r, w, e = select.select(
[socket_[0] for socket_ in self._sockets],
[], [], poll_interval)
for socket_ in r:
self.socket = socket_
handle_request()
self.socket = None
finally:
self.__ws_is_shut_down.set()
def shutdown(self):
"""Override SocketServer.BaseServer.shutdown."""
self.__ws_serving = False
self.__ws_is_shut_down.wait()
class WebSocketRequestHandler(CGIHTTPServer.CGIHTTPRequestHandler):
"""CGIHTTPRequestHandler specialized for WebSocket."""
# Use httplib.HTTPMessage instead of mimetools.Message.
MessageClass = httplib.HTTPMessage
def setup(self):
"""Override SocketServer.StreamRequestHandler.setup to wrap rfile
with MemorizingFile.
This method will be called by BaseRequestHandler's constructor
before calling BaseHTTPRequestHandler.handle.
BaseHTTPRequestHandler.handle will call
BaseHTTPRequestHandler.handle_one_request and it will call
WebSocketRequestHandler.parse_request.
"""
# Call superclass's setup to prepare rfile, wfile, etc. See setup
# definition on the root class SocketServer.StreamRequestHandler to
# understand what this does.
CGIHTTPServer.CGIHTTPRequestHandler.setup(self)
self.rfile = memorizingfile.MemorizingFile(
self.rfile,
max_memorized_lines=_MAX_MEMORIZED_LINES)
def __init__(self, request, client_address, server):
self._logger = util.get_class_logger(self)
self._options = server.websocket_server_options
# Overrides CGIHTTPServerRequestHandler.cgi_directories.
self.cgi_directories = self._options.cgi_directories
# Replace CGIHTTPRequestHandler.is_executable method.
if self._options.is_executable_method is not None:
self.is_executable = self._options.is_executable_method
# This actually calls BaseRequestHandler.__init__.
CGIHTTPServer.CGIHTTPRequestHandler.__init__(
self, request, client_address, server)
def parse_request(self):
"""Override BaseHTTPServer.BaseHTTPRequestHandler.parse_request.
Return True to continue processing for HTTP(S), False otherwise.
See BaseHTTPRequestHandler.handle_one_request method which calls
this method to understand how the return value will be handled.
"""
# We hook parse_request method, but also call the original
# CGIHTTPRequestHandler.parse_request since when we return False,
# CGIHTTPRequestHandler.handle_one_request continues processing and
# it needs variables set by CGIHTTPRequestHandler.parse_request.
#
# Variables set by this method will be also used by WebSocket request
# handling. See _StandaloneRequest.get_request, etc.
if not CGIHTTPServer.CGIHTTPRequestHandler.parse_request(self):
return False
host, port, resource = http_header_util.parse_uri(self.path)
if resource is None:
self._logger.info('Invalid URI: %r', self.path)
self._logger.info('Fallback to CGIHTTPRequestHandler')
return True
server_options = self.server.websocket_server_options
if host is not None:
validation_host = server_options.validation_host
if validation_host is not None and host != validation_host:
self._logger.info('Invalid host: %r (expected: %r)',
host,
validation_host)
self._logger.info('Fallback to CGIHTTPRequestHandler')
return True
if port is not None:
validation_port = server_options.validation_port
if validation_port is not None and port != validation_port:
self._logger.info('Invalid port: %r (expected: %r)',
port,
validation_port)
self._logger.info('Fallback to CGIHTTPRequestHandler')
return True
self.path = resource
request = _StandaloneRequest(self, self._options.use_tls)
try:
# Fallback to default http handler for request paths for which
# we don't have request handlers.
if not self._options.dispatcher.get_handler_suite(self.path):
self._logger.info('No handler for resource: %r', self.path)
self._logger.info('Fallback to CGIHTTPRequestHandler')
return True
try:
handshake.do_handshake(
request,
self._options.dispatcher,
allowDraft75=self._options.allow_draft75,
strict=self._options.strict)
except handshake.AbortedByUserException, e:
self._logger.info('%s', e)
return False
try:
request._dispatcher = self._options.dispatcher
self._options.dispatcher.transfer_data(request)
except dispatch.DispatchException, e:
self._logger.warning('%s', e)
return False
except handshake.AbortedByUserException, e:
self._logger.info('%s', e)
except Exception, e:
# Catch exception in transfer_data.
# In this case, handshake has been successful, so just log
# the exception and return False.
self._logger.info('%s', e)
self._logger.info('%s', util.get_stack_trace())
except dispatch.DispatchException, e:
self._logger.warning('%s', e)
self.send_error(e.status)
except handshake.HandshakeException, e:
# Handshake for ws(s) failed. Assume http(s).
self._logger.info('%s', e)
self.send_error(e.status)
except handshake.VersionException, e:
self._logger.info('%s', e)
self.send_response(common.HTTP_STATUS_BAD_REQUEST)
self.send_header(common.SEC_WEBSOCKET_VERSION_HEADER,
e.supported_versions)
self.end_headers()
except Exception, e:
self._logger.warning('%s', e)
self._logger.warning('%s', util.get_stack_trace())
return False
def log_request(self, code='-', size='-'):
"""Override BaseHTTPServer.log_request."""
self._logger.info('"%s" %s %s',
self.requestline, str(code), str(size))
def log_error(self, *args):
"""Override BaseHTTPServer.log_error."""
# Despite the name, this method is for warnings than for errors.
# For example, HTTP status code is logged by this method.
self._logger.warning('%s - %s',
self.address_string(),
args[0] % args[1:])
def is_cgi(self):
"""Test whether self.path corresponds to a CGI script.
Add extra check that self.path doesn't contains ..
Also check if the file is a executable file or not.
If the file is not executable, it is handled as static file or dir
rather than a CGI script.
"""
if CGIHTTPServer.CGIHTTPRequestHandler.is_cgi(self):
if '..' in self.path:
return False
# strip query parameter from request path
resource_name = self.path.split('?', 2)[0]
# convert resource_name into real path name in filesystem.
scriptfile = self.translate_path(resource_name)
if not os.path.isfile(scriptfile):
return False
if not self.is_executable(scriptfile):
return False
return True
return False
def _configure_logging(options):
logger = logging.getLogger()
logger.setLevel(logging.getLevelName(options.log_level.upper()))
if options.log_file:
handler = logging.handlers.RotatingFileHandler(
options.log_file, 'a', options.log_max, options.log_count)
else:
handler = logging.StreamHandler()
formatter = logging.Formatter(
'[%(asctime)s] [%(levelname)s] %(name)s: %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)
def _alias_handlers(dispatcher, websock_handlers_map_file):
"""Set aliases specified in websock_handler_map_file in dispatcher.
Args:
dispatcher: dispatch.Dispatcher instance
websock_handler_map_file: alias map file
"""
fp = open(websock_handlers_map_file)
try:
for line in fp:
if line[0] == '#' or line.isspace():
continue
m = re.match('(\S+)\s+(\S+)', line)
if not m:
logging.warning('Wrong format in map file:' + line)
continue
try:
dispatcher.add_resource_path_alias(
m.group(1), m.group(2))
except dispatch.DispatchException, e:
logging.error(str(e))
finally:
fp.close()
def _main():
parser = optparse.OptionParser()
parser.add_option('-H', '--server-host', '--server_host',
dest='server_host',
default='',
help='server hostname to listen to')
parser.add_option('-V', '--validation-host', '--validation_host',
dest='validation_host',
default=None,
help='server hostname to validate in absolute path.')
parser.add_option('-p', '--port', dest='port', type='int',
default=common.DEFAULT_WEB_SOCKET_PORT,
help='port to listen to')
parser.add_option('-P', '--validation-port', '--validation_port',
dest='validation_port', type='int',
default=None,
help='server port to validate in absolute path.')
parser.add_option('-w', '--websock-handlers', '--websock_handlers',
dest='websock_handlers',
default='.',
help='WebSocket handlers root directory.')
parser.add_option('-m', '--websock-handlers-map-file',
'--websock_handlers_map_file',
dest='websock_handlers_map_file',
default=None,
help=('WebSocket handlers map file. '
'Each line consists of alias_resource_path and '
'existing_resource_path, separated by spaces.'))
parser.add_option('-s', '--scan-dir', '--scan_dir', dest='scan_dir',
default=None,
help=('WebSocket handlers scan directory. '
'Must be a directory under websock_handlers.'))
parser.add_option('--allow-handlers-outside-root-dir',
'--allow_handlers_outside_root_dir',
dest='allow_handlers_outside_root_dir',
action='store_true',
default=False,
help=('Scans WebSocket handlers even if their canonical '
'path is not under websock_handlers.'))
parser.add_option('-d', '--document-root', '--document_root',
dest='document_root', default='.',
help='Document root directory.')
parser.add_option('-x', '--cgi-paths', '--cgi_paths', dest='cgi_paths',
default=None,
help=('CGI paths relative to document_root.'
'Comma-separated. (e.g -x /cgi,/htbin) '
'Files under document_root/cgi_path are handled '
'as CGI programs. Must be executable.'))
parser.add_option('-t', '--tls', dest='use_tls', action='store_true',
default=False, help='use TLS (wss://)')
parser.add_option('-k', '--private-key', '--private_key',
dest='private_key',
default='', help='TLS private key file.')
parser.add_option('-c', '--certificate', dest='certificate',
default='', help='TLS certificate file.')
parser.add_option('-l', '--log-file', '--log_file', dest='log_file',
default='', help='Log file.')
parser.add_option('--log-level', '--log_level', type='choice',
dest='log_level', default='warn',
choices=['debug', 'info', 'warning', 'warn', 'error',
'critical'],
help='Log level.')
parser.add_option('--log-max', '--log_max', dest='log_max', type='int',
default=_DEFAULT_LOG_MAX_BYTES,
help='Log maximum bytes')
parser.add_option('--log-count', '--log_count', dest='log_count',
type='int', default=_DEFAULT_LOG_BACKUP_COUNT,
help='Log backup count')
parser.add_option('--allow-draft75', dest='allow_draft75',
action='store_true', default=False,
help='Allow draft 75 handshake')
parser.add_option('--strict', dest='strict', action='store_true',
default=False, help='Strictly check handshake request')
parser.add_option('-q', '--queue', dest='request_queue_size', type='int',
default=_DEFAULT_REQUEST_QUEUE_SIZE,
help='request queue size')
options = parser.parse_args()[0]
os.chdir(options.document_root)
_configure_logging(options)
# TODO(tyoshino): Clean up initialization of CGI related values. Move some
# of code here to WebSocketRequestHandler class if it's better.
options.cgi_directories = []
options.is_executable_method = None
if options.cgi_paths:
options.cgi_directories = options.cgi_paths.split(',')
if sys.platform in ('cygwin', 'win32'):
cygwin_path = None
# For Win32 Python, it is expected that CYGWIN_PATH
# is set to a directory of cygwin binaries.
# For example, websocket_server.py in Chromium sets CYGWIN_PATH to
# full path of third_party/cygwin/bin.
if 'CYGWIN_PATH' in os.environ:
cygwin_path = os.environ['CYGWIN_PATH']
util.wrap_popen3_for_win(cygwin_path)
def __check_script(scriptpath):
return util.get_script_interp(scriptpath, cygwin_path)
options.is_executable_method = __check_script
if options.use_tls:
if not _HAS_OPEN_SSL:
logging.critical('To use TLS, install pyOpenSSL.')
sys.exit(1)
if not options.private_key or not options.certificate:
logging.critical(
'To use TLS, specify private_key and certificate.')
sys.exit(1)
if not options.scan_dir:
options.scan_dir = options.websock_handlers
try:
# Share a Dispatcher among request handlers to save time for
# instantiation. Dispatcher can be shared because it is thread-safe.
options.dispatcher = dispatch.Dispatcher(
options.websock_handlers,
options.scan_dir,
options.allow_handlers_outside_root_dir)
if options.websock_handlers_map_file:
_alias_handlers(options.dispatcher,
options.websock_handlers_map_file)
warnings = options.dispatcher.source_warnings()
if warnings:
for warning in warnings:
logging.warning('mod_pywebsocket: %s' % warning)
server = WebSocketServer(options)
server.serve_forever()
except Exception, e:
logging.critical('mod_pywebsocket: %s' % e)
logging.critical('mod_pywebsocket: %s' % util.get_stack_trace())
sys.exit(1)
if __name__ == '__main__':
_main()
# vi:sts=4 sw=4 et
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