Changeset 1969


Ignore:
Timestamp:
Jan 9, 2009, 2:19:48 AM (16 years ago)
Author:
quentin
Message:

Standalone VNC client in Python, for people who don't want to run Java

Location:
trunk/scripts/vnc-client
Files:
1 added
1 copied

Legend:

Unmodified
Added
Removed
  • trunk/scripts/vnc-client/invirt-vnc-client

    r1964 r1969  
    1 #! /usr/bin/python
    2 from twisted.internet import reactor, ssl
    3 from invirt import vnc
     1#!/usr/bin/python
     2from twisted.internet import reactor, ssl, protocol
     3from OpenSSL import SSL
     4import base64, pickle
     5import getopt, sys
    46
    5 sslContext = ssl.DefaultOpenSSLContextFactory(
    6         '/etc/invirt/vnc/server.pem',
    7         '/etc/invirt/vnc/server.crt',
    8 )
     7verbose = False
     8
     9def usage():
     10    print """%s [-v] [-l [HOST:]PORT] {-a AUTHTOKEN|VMNAME}
     11 -l, --listen [HOST:]PORT  port (and optionally host) to listen on for
     12                           connections (default is 127.0.0.1 and a randomly
     13                           chosen port)
     14 -a, --authtoken AUTHTOKEN Authentication token for connecting to the VNC server
     15 VMNAME                    VM name to connect to (automatically fetches an
     16                           authentication token using remctl)
     17 -v                        verbose status messages""" % (sys.argv[0])
     18
     19class ClientContextFactory(ssl.ClientContextFactory):
     20
     21    def _verify(self, connection, x509, errnum, errdepth, ok):
     22        print '_verify (ok=%d):' % ok
     23        print '  subject:', x509.get_subject()
     24        print '  issuer:', x509.get_issuer()
     25        print '  errnum %s, errdepth %d' % (errnum, errdepth)
     26        return ok
     27
     28    def getContext(self):
     29        ctx = ssl.ClientContextFactory.getContext(self)
     30
     31        certFile = '/mit/xvm/vnc/servers.cert'
     32        if verbose: print "Loading certificates from %s" % certFile
     33        ctx.load_verify_locations(certFile)
     34        ctx.set_verify(SSL.VERIFY_PEER|SSL.VERIFY_FAIL_IF_NO_PEER_CERT,
     35                       self._verify)
     36
     37        return ctx
     38
     39class Proxy(protocol.Protocol):
     40    peer = None
     41
     42    def setPeer(self, peer):
     43        self.peer = peer
     44
     45    def connectionLost(self, reason):
     46        if self.peer is not None:
     47            self.peer.transport.loseConnection()
     48            self.peer = None
     49
     50    def dataReceived(self, data):
     51        self.peer.transport.write(data)
     52
     53class ProxyClient(Proxy):
     54    ready = False
     55
     56    def connectionMade(self):
     57        self.peer.setPeer(self)
     58        data = "CONNECTVNC %s VNCProxy/1.0\r\nAuth-token: %s\r\n\r\n" % (self.factory.machine, self.factory.authtoken)
     59        self.transport.write(data)
     60        if verbose: print "ProxyClient: connection made"
     61    def dataReceived(self, data):
     62        if not ready:
     63            if verbose: print 'ProxyClient: received data "%s"' % data
     64            if data.startswith("VNCProxy/1.0 200 "):
     65                ready = True
     66                if "\n" in data:
     67                    self.peer.transport.write(data[data.find("\n")+1:])
     68                self.peer.transport.resumeProducing() # Allow reading
     69            else:
     70                print "Failed to connect: %s" % data
     71                self.transport.loseConnection()
     72
     73class ProxyClientFactory(protocol.ClientFactory):
     74    protocol = ProxyClient
     75   
     76    def __init__(self, authtoken, machine):
     77        self.authtoken = authtoken
     78        self.machine = machine
     79
     80    def setServer(self, server):
     81        self.server = server
     82
     83    def buildProtocol(self, *args, **kw):
     84        prot = protocol.ClientFactory.buildProtocol(self, *args, **kw)
     85        prot.setPeer(self.server)
     86        return prot
     87
     88    def clientConnectionFailed(self, connector, reason):
     89        self.server.transport.loseConnection()
     90
     91
     92class ProxyServer(Proxy):
     93    clientProtocolFactory = ProxyClientFactory
     94    authtoken = None
     95    machine = None
     96
     97    def connectionMade(self):
     98        # Don't read anything from the connecting client until we have
     99        # somewhere to send it to.
     100        self.transport.pauseProducing()
     101       
     102        if verbose: print "ProxyServer: connection made"
     103
     104        client = self.clientProtocolFactory(self.factory.authtoken, self.factory.machine)
     105        client.setServer(self)
     106
     107        reactor.connectSSL(self.factory.host, self.factory.port, client, ClientContextFactory())
     108       
     109
     110class ProxyFactory(protocol.Factory):
     111    protocol = ProxyServer
     112
     113    def __init__(self, host, port, authtoken, machine):
     114        self.host = host
     115        self.port = port
     116        self.authtoken = authtoken
     117        self.machine = machine
     118
     119def main():
     120    global verbose
     121    try:
     122        opts, args = getopt.gnu_getopt(sys.argv[1:], "hl:a:v",
     123                                       ["help", "listen=", "authtoken="])
     124    except getopt.GetoptError, err:
     125        print str(err) # will print something like "option -a not recognized"
     126        usage()
     127        sys.exit(2)
     128    listen = ["127.0.0.1", None]
     129    authtoken = None
     130    for o, a in opts:
     131        if o == "-v":
     132            verbose = True
     133        elif o in ("-h", "--help"):
     134            usage()
     135            sys.exit()
     136        elif o in ("-l", "--listen"):
     137            if ":" in a:
     138                listen = a.split(":", 2)
     139            else:
     140                listen[1] = a
     141        elif o in ("-a", "--authtoken"):
     142            authtoken = a
     143        else:
     144            assert False, "unhandled option"
     145
     146    # Get authentication token
     147    if authtoken is None:
     148        # User didn't give us an authentication token, so we need to get one
     149        if len(args) != 1:
     150            print "VMNAME not given or too many arguments"
     151            usage()
     152            sys.exit(2)
     153        from subprocess import PIPE, Popen
     154        try:
     155            p = Popen(["remctl", "remote", "control", args[0], "vnctoken"],
     156                      stdout=PIPE)
     157        except OSError:
     158            if verbose: print "remctl not found in path. Trying remctl locker."
     159            p = Popen(["athrun", "remctl", "remctl",
     160                       "remote", "control", args[0], "vnctoken"],
     161                      stdout=PIPE)
     162        authtoken = p.communicate()[0]
     163        if p.returncode != 0:
     164            print "Unable to get authentication token"
     165            sys.exit(1)
     166        if verbose: print 'Got authentication token "%s" for VM %s' % \
     167                          (authtoken, args[0])
     168
     169    # Unpack authentication token
     170    try:
     171        token_outer = base64.urlsafe_b64decode(authtoken)
     172        token_outer = pickle.loads(token_outer)
     173        token_inner = pickle.loads(token_outer["data"])
     174        machine = token_inner["machine"]
     175        connect_host = token_inner["connect_host"]
     176        connect_port = token_inner["connect_port"]
     177        token_expires = token_inner["expires"]
     178        if verbose: print "Unpacked authentication token:\n%s" % \
     179                          repr(token_inner)
     180    except:
     181        print "Invalid authentication token"
     182        sys.exit(1)
     183   
     184    if verbose: print "Will connect to %s:%s" % (connect_host, connect_port)
     185   
     186    listen[1] = 10003
     187    reactor.listenTCP(listen[1], ProxyFactory(connect_host, connect_port, authtoken, machine))
     188   
     189    print "Ready to connect. Connect to %s:%s now with your VNC client. The password is 'moocow'." % (listen[0], listen[1])
     190   
     191    reactor.run()
    9192
    10193if '__main__' == __name__:
    11     reactor.listenSSL(10003,vnc.VNCAuthFactory("localhost"), contextFactory=sslContext)
    12     reactor.run()
     194    main()
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