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OpenStack Study: xvp_proxy.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012 OpenStack Foundation # All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Eventlet WSGI Services to proxy VNC for XCP protocol.""" import socket import webob import eventlet import eventlet.green import eventlet.greenio import eventlet.wsgi from oslo.config import cfg from nova.consoleauth import rpcapi as consoleauth_rpcapi from nova import context from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging from nova import version from nova import wsgi LOG = logging.getLogger(__name__) xvp_proxy_opts = [ cfg.IntOpt('xvpvncproxy_port', default=6081, help='Port that the XCP VNC proxy should bind to'), cfg.StrOpt('xvpvncproxy_host', default='0.0.0.0', help='Address that the XCP VNC proxy should bind to'), ] CONF = cfg.CONF CONF.register_opts(xvp_proxy_opts)
**** CubicPower OpenStack Study **** class XCPVNCProxy(object): """Class to use the xvp auth protocol to proxy instance vnc consoles."""
**** CubicPower OpenStack Study **** def one_way_proxy(self, source, dest): """Proxy tcp connection from source to dest.""" while True: try: d = source.recv(32384) except Exception: d = None # If recv fails, send a write shutdown the other direction if d is None or len(d) == 0: dest.shutdown(socket.SHUT_WR) break # If send fails, terminate proxy in both directions try: # sendall raises an exception on write error, unlike send dest.sendall(d) except Exception: source.close() dest.close() break
**** CubicPower OpenStack Study **** def handshake(self, req, connect_info, sockets): """Execute hypervisor-specific vnc auth handshaking (if needed).""" host = connect_info['host'] port = int(connect_info['port']) server = eventlet.connect((host, port)) # Handshake as necessary if connect_info.get('internal_access_path'): server.sendall("CONNECT %s HTTP/1.1\r\n\r\n" % connect_info['internal_access_path']) data = "" while True: b = server.recv(1) if b: data += b if data.find("\r\n\r\n") != -1: if not data.split("\r\n")[0].find("200"): LOG.audit(_("Error in handshake: %s"), data) return break if not b or len(data) > 4096: LOG.audit(_("Error in handshake: %s"), data) return client = req.environ['eventlet.input'].get_socket() client.sendall("HTTP/1.1 200 OK\r\n\r\n") sockets['client'] = client sockets['server'] = server
**** CubicPower OpenStack Study **** def proxy_connection(self, req, connect_info, start_response): """Spawn bi-directional vnc proxy.""" sockets = {} t0 = eventlet.spawn(self.handshake, req, connect_info, sockets) t0.wait() if not sockets.get('client') or not sockets.get('server'): LOG.audit(_("Invalid request: %s"), req) start_response('400 Invalid Request', [('content-type', 'text/html')]) return "Invalid Request" client = sockets['client'] server = sockets['server'] t1 = eventlet.spawn(self.one_way_proxy, client, server) t2 = eventlet.spawn(self.one_way_proxy, server, client) t1.wait() t2.wait() # Make sure our sockets are closed server.close() client.close()
**** CubicPower OpenStack Study **** def __call__(self, environ, start_response): try: req = webob.Request(environ) LOG.audit(_("Request: %s"), req) token = req.params.get('token') if not token: LOG.audit(_("Request made with missing token: %s"), req) start_response('400 Invalid Request', [('content-type', 'text/html')]) return "Invalid Request" ctxt = context.get_admin_context() api = consoleauth_rpcapi.ConsoleAuthAPI() connect_info = api.check_token(ctxt, token) if not connect_info: LOG.audit(_("Request made with invalid token: %s"), req) start_response('401 Not Authorized', [('content-type', 'text/html')]) return "Not Authorized" return self.proxy_connection(req, connect_info, start_response) except Exception as e: LOG.audit(_("Unexpected error: %s"), e)
**** CubicPower OpenStack Study **** class SafeHttpProtocol(eventlet.wsgi.HttpProtocol): """HttpProtocol wrapper to suppress IOErrors. The proxy code above always shuts down client connections, so we catch the IOError that raises when the SocketServer tries to flush the connection. """
**** CubicPower OpenStack Study **** def finish(self): try: eventlet.green.BaseHTTPServer.BaseHTTPRequestHandler.finish(self) except IOError: pass eventlet.greenio.shutdown_safe(self.connection) self.connection.close() def get_wsgi_server(): LOG.audit(_("Starting nova-xvpvncproxy node (version %s)"), version.version_string_with_package()) return wsgi.Server("XCP VNC Proxy", XCPVNCProxy(), protocol=SafeHttpProtocol, host=CONF.xvpvncproxy_host, port=CONF.xvpvncproxy_port)
**** CubicPower OpenStack Study **** def get_wsgi_server(): LOG.audit(_("Starting nova-xvpvncproxy node (version %s)"), version.version_string_with_package()) return wsgi.Server("XCP VNC Proxy", XCPVNCProxy(), protocol=SafeHttpProtocol, host=CONF.xvpvncproxy_host, port=CONF.xvpvncproxy_port)
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