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#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2012 OpenStack, LLC.
# 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 nova.consoleauth import rpcapi as consoleauth_rpcapi
from nova import context
from nova.openstack.common import cfg
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)
class XCPVNCProxy(object):
"""Class to use the xvp auth protocol to proxy instance vnc consoles."""
def one_way_proxy(self, source, dest):
"""Proxy tcp connection from source to dest."""
while True:
try:
d = source.recv(32384)
except Exception as e:
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 as e:
source.close()
dest.close()
break
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")
socketsserver = None
sockets['client'] = client
sockets['server'] = server
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()
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)
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.
"""
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_vcs())
return wsgi.Server("XCP VNC Proxy",
XCPVNCProxy(),
protocol=SafeHttpProtocol,
host=CONF.xvpvncproxy_host,
port=CONF.xvpvncproxy_port)
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