1 <!-- 2 index.vnc - default HTML page for TightVNC Java viewer applet, to be 3 used with Xvnc. On any file ending in .vnc, the HTTP server embedded in 4 Xvnc will substitute the following variables when preceded by a dollar: 5 USER, DESKTOP, DISPLAY, APPLETWIDTH, APPLETHEIGHT, WIDTH, HEIGHT, PORT, 6 PARAMS. Use two dollar signs ($$) to get a dollar sign in the generated 7 HTML page. 8 9 NOTE: the $PARAMS variable is not supported by the standard VNC, so 10 make sure you have TightVNC on the server side, if you're using this 11 variable. 12 --> 13 14 <!-- 15 The idea behind using the signed applet in SignedVncViewer.jar for 16 firewall proxies: 17 18 Java socket applets and http proxies do not get along well. 19 20 Java security allows the applet to connect back via a socket to the 21 originating host, but the browser/plugin Proxy settings are not used for 22 socket connections (only http and the like). So the socket connection 23 fails in the proxy environment. 24 25 The applet is not allowed to open a socket connection to the proxy (since 26 that would let it connect to just about any host, e.g. CONNECT method). 27 28 This is indpendent of SSL but of course fails for that socket connection 29 as well. I.e. this is a problem for non-SSL VNC Viewers as well. 30 31 Solution? Sign the applet and have the user click on "Yes" that they 32 fully trust the applet. Then the applet can connect to any host via 33 sockets, in particular the proxy. It next issues the request 34 35 CONNECT host:port HTTP/1.1 36 Host: host:port 37 38 and if the proxy supports the CONNECT method we are finally connected to 39 the VNC server. 40 41 For SSL connections, SSL is layered on top of this socket. However note 42 this scheme will work for non-SSL applet proxy tunnelling as well. 43 44 It should be able to get non-SSL VNC connections to work via GET 45 command but that has not been done yet. 46 47 Note that some proxies only allow CONNECT to only these the ports 443 48 (HTTPS) and 563 (SNEWS). So you would have to run the VNC server on 49 those ports. 50 51 SignedVncViewer.jar is just a signed version of VncViewer.jar 52 53 The URL to use for this file: https://host:port/proxy.vnc 54 55 Note VNCSERVERPORT, we assume $PARAMS will have the correct PORT setting 56 (e.g. 563), not the one libvncserver puts in.... 57 58 --> 59 60 61 <HTML> 62 <TITLE> 63 $USER's $DESKTOP desktop ($DISPLAY) 64 </TITLE> 65 <APPLET CODE=VncViewer.class ARCHIVE=SignedVncViewer.jar 66 WIDTH=$APPLETWIDTH HEIGHT=$APPLETHEIGHT> 67 <param name=VNCSERVERPORT value=$PORT> 68 <param name="Open New Window" value=yes> 69 $PARAMS 70 </APPLET> 71 <BR> 72 <A href="http://www.karlrunge.com/x11vnc">x11vnc site</A> 73 </HTML> 74
