First RFB protocol stub implementation.
- Requires wsproxy to proxy to the VNC server.
This commit is contained in:
Joel Martin
parent
f9d4566547
commit
65e27ddd4c
147
rfb_notes
Normal file
147
rfb_notes
Normal file
@ -0,0 +1,147 @@
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5.1.1 ProtocolVersion: 12, 12 bytes
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- Sent by server, max supported
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12 ascii - "RFB 003.008\n"
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- Response by client, version to use
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12 ascii - "RFB 003.003\n"
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5.1.2 Authentication: >=4, [16, 4] bytes
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- Sent by server
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CARD32 - authentication-scheme
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0 - connection failed
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CARD32 - length
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length - reason
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1 - no authentication
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2 - VNC authentication
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16 CARD8 - challenge (random bytes)
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- Response by client (if VNC authentication)
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16 CARD8 - client encrypts the challenge with DES, using user
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password as key, sends resulting 16 byte response
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- Response by server (if VNC authentication)
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CARD32 - 0 - OK
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1 - failed
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2 - too-many
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5.1.3 ClientInitialisation: 1 byte
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- Sent by client
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CARD8 - shared-flag, 0 exclusive, non-zero shared
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5.1.4 ServerInitialisation: >=24 bytes
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- Sent by server
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CARD16 - framebuffer-width
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CARD16 - framebuffer-height
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16 byte PIXEL_FORMAT - server-pixel-format
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CARD8 - bits-per-pixel
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CARD8 - depth
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CARD8 - big-endian-flag, non-zero is big endian
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CARD8 - true-color-flag, non-zero then next 6 apply
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CARD16 - red-max
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CARD16 - green-max
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CARD16 - blue-max
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CARD8 - red-shift
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CARD8 - green-shift
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CARD8 - blue-shift
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3 bytes - padding
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CARD32 - name-length
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CARD8[length] - name-string
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Client to Server Messages:
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5.2.1 SetPixelFormat: 20 bytes
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CARD8: 0 - message-type
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...
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5.2.2 FixColourMapEntries: >=6 bytes
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CARD8: 1 - message-type
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...
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5.2.3 SetEncodings: >=8 bytes
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CARD8: 2 - message-type
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CARD8 - padding
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CARD16 - numer-of-encodings
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CARD32 - encoding-type in preference order
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0 - raw
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1 - copy-rectangle
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2 - RRE
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4 - CoRRE
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5 - hextile
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5.2.4 FramebufferUpdateRequest (10 bytes)
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CARD8: 3 - message-type
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CARD8 - incremental (0 for full-update, non-zero for incremental)
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CARD16 - x-position
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CARD16 - y-position
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CARD16 - width
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CARD16 - height
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5.2.5 KeyEvent: 8 bytes
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CARD8: 4 - message-type
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CARD8 - down-flag
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2 bytes - padding
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CARD32 - key (X-Windows keysym values)
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5.2.6 PointerEvent: 6 bytes
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CARD8: 5 - message-type
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CARD8 - button-mask
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CARD16 - x-position
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CARD16 - y-position
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5.2.7 ClientCutText: >=9 bytes
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CARD8: 6 - message-type
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...
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Server to Client Messages:
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5.3.1 FramebufferUpdate
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CARD8: 0 - message-type
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1 byte - padding
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CARD16 - number-of-rectangles
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CARD16 - x-position
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CARD16 - y-position
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CARD16 - width
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CARD16 - height
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CARD16 - encoding-type:
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0 - raw
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1 - copy rectangle
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2 - RRE
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4 - CoRRE
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5 - hextile
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raw:
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- width x height pixel values
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copy rectangle:
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CARD16 - src-x-position
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CARD16 - src-y-position
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RRE:
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CARD32 - N number-of-subrectangles
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Nxd bytes - background-pixel-value (d bits-per-pixel)
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...
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5.3.2 SetColourMapEntries (no support)
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CARD8: 1 - message-type
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...
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5.3.3 Bell
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CARD8: 2 - message-type
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5.3.4 ServerCutText
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CARD8: 3 - message-type
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38
vnc.html
Normal file
38
vnc.html
Normal file
@ -0,0 +1,38 @@
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<html>
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<body onload="draw();">
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VNC Window:<br>
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<canvas id="vnc" width="800" height="600">
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Canvas not supported.
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</canvas>
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<br><br>
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Debug:
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<div id="debug"></div>
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</body>
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<script src="include/mootools.js"></script>
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<script src="include/mootools-more.js"></script>
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<script src="vnc.js"></script>
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<script type="text/javascript">
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function connect() {
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debug(">> connect");
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var uri = new URI(window.location);
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var host = uri.getData("host");
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var port = uri.getData("port");
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if ((!host) || (!port)) {
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debug("must set host and port");
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return;
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}
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init_ws(host, port);
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debug("<< connect");
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}
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window.onload = connect();
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</script>
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</html>
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339
vnc.js
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339
vnc.js
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@ -0,0 +1,339 @@
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debug("here0");
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var ws = null;
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var vnc_host = '';
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var vnc_port = 5900;
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var rfb_state = 'ProtocolVersion';
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var rfb_shared = 1;
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var fb_width = 0;
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var fb_height = 0;
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var fb_name = "";
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function card8(num) {
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return String.fromCharCode(num);
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}
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String.prototype.card8 = function (pos) {
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return this.charCodeAt(pos);
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}
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function card16(num) {
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return String.fromCharCode(num >> 8) +
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String.fromCharCode(num & 0xFF);
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}
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String.prototype.card16 = function (pos) {
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debug("card16 0: " + this.charCodeAt(pos));
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debug("card16 1: " + this.charCodeAt(pos+1));
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return (this.charCodeAt(pos) << 8) +
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(this.charCodeAt(pos+1) );
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}
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function card32(num) {
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return String.fromCharCode( num >> 24) +
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String.fromCharCode((num >> 16) & 0xFF) +
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String.fromCharCode((num >> 8) & 0xFF) +
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String.fromCharCode( num & 0xFF);
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}
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String.prototype.card32 = function (pos) {
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debug("card32 0: " + this.charCodeAt(pos));
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debug("card32 1: " + this.charCodeAt(pos+1));
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debug("card32 2: " + this.charCodeAt(pos+2));
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debug("card32 3: " + this.charCodeAt(pos+3));
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return (this.charCodeAt(pos) << 24) +
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(this.charCodeAt(pos+1) << 16) +
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(this.charCodeAt(pos+2) << 8) +
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(this.charCodeAt(pos+3) );
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}
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function debug(str) {
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cell = $('debug');
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cell.innerHTML += str + "<br/>";
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}
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/*
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* Server message handlers
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*/
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/* RFB/VNC initialisation */
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function rfb_init_msg(data) {
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debug(">> rfb_init_msg");
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switch (rfb_state) {
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case 'ProtocolVersion' :
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debug("ProtocolVersion: " + data)
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if (data.length != 12) {
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debug("Invalid protocol version from server");
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rfb_state = 'reset';
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return;
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}
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ws.send("RFB 003.003\n");
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rfb_state = 'Authentication';
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break;
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case 'Authentication' :
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debug("Authentication")
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if (data.length != 4) {
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debug("Invalid auth scheme");
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rfb_state = 'reset';
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return;
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}
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var scheme = data.card32(0);
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debug("Auth scheme: " + scheme);
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switch (scheme) {
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case 0: // connection failed
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var strlen = data.card32(4);
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var reason = data.substr(8, strlen);
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debug("auth failed: " + reason);
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rfb_state = "reset";
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return;
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case 1: // no authentication
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ws.send(card8(rfb_shared)); // ClientInitialisation
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rfb_state = "ServerInitialisation";
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break;
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case 2: // VNC authentication
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var challenge = data.substr(4, 16);
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// TODO:
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//var crypt = des(challenge, password);
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//ws.send(crypt);
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rfb_state = "Authentication-VNC";
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break;
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}
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break;
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case 'Authentication-VNC' :
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debug("Authentication-VNC")
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if (data.length != 4) {
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debug("Invalid server auth response");
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rfb_state = 'reset';
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return;
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}
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var resp = data.card32(0);
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switch (resp) {
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case 0: // OK
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debug("Authentication OK");
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break;
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case 1: // failed
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debug("Authentication failed");
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rfb_state = "reset";
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return;
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case 2: // too-many
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debug("Too many authentication attempts");
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rfb_state = "reset";
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return;
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}
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ws.send(card8(rfb_shared)); // ClientInitialisation
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rfb_state = "ServerInitialisation";
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break;
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case 'ServerInitialisation' :
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debug("ServerInitialisation")
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if (data.length < 24) {
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debug("Invalid server initialisation");
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rfb_state = 'reset';
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return;
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}
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fb_width = data.card16(0);
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fb_height = data.card16(2);
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var name_length = data.card32(20);
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fb_name = data.substr(24, name_length);
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debug("Screen size: " + fb_width + "x" + fb_height);
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debug("Name: " + fb_name);
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rfb_state = 'normal';
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break;
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}
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debug("<< rfb_init_msg");
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}
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/* Normal RFB/VNC messages */
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function rfb_msg(data) {
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debug(">> rfb_msg");
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var msg_type = data.card8(0);
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switch (msg_type) {
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case 0: // FramebufferUpdate
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debug("FramebufferUpdate");
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break;
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case 1: // SetColourMapEntries
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debug("SetColourMapEntries");
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break;
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case 2: // Bell
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debug("Bell");
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break;
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case 3: // ServerCutText
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debug("ServerCutText");
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break;
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default:
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debug("Unknown server message type: " + msg_type);
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break;
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}
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debug("<< rfb_msg");
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}
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/*
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* Client message routines
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*/
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function setPixelFormat() {
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}
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function fixColourMapEntries() {
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}
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function setEncodings() {
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}
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function fbUpdateRequest() {
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}
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function keyEvent() {
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}
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function pointerEvent() {
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}
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function clientCutText() {
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}
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/*
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* Setup routines
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*/
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function _init_ws() {
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debug(">> _init_ws");
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var uri = "ws://" + vnc_host + ":" + vnc_port;
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debug("connecting to " + uri);
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ws = new WebSocket(uri);
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ws.onmessage = function(e) {
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debug(">> onmessage");
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if (rfb_state != 'normal') {
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rfb_init_msg(e.data);
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} else {
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rfb_msg(e.data);
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}
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if (rfb_state == 'reset') {
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/* close and reset connection */
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ws.close();
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_init_ws();
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}
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debug("<< onmessage");
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};
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ws.onopen = function(e) {
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debug(">> onopen");
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rfb_state = "ProtocolVersion";
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debug("<< onopen");
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};
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ws.onclose = function(e) {
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debug(">> onclose");
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rfb_state = "closed";
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debug("<< onclose");
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}
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debug("<< _init_ws");
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}
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function init_ws(host, port) {
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debug(">> init_ws");
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vnc_host = host;
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vnc_port = port;
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if (ws) {
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ws.close();
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}
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_init_ws();
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debug("<< init_ws");
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}
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/*
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function draw() {
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var canvas = document.getElementById('vnc');
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if (! canvas.getContext) return;
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var ctx = canvas.getContext('2d');
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ctx.fillStyle = "rgb(50,50,50)";
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ctx.fillRect(0, 0, 800, 600);
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var img = new Image();
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img.src = "head_ani2.gif"
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ctx.drawImage(img, 10, 10);
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ctx.drawImage(canvas, 20, 20, 30, 30, 70, 70, 30, 30);
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}
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function draw2() {
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var canvas = document.getElementById('tutorial');
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if (! canvas.getContext) return;
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var ctx = canvas.getContext('2d');
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roundedRect(ctx,12,12,150,150,15);
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roundedRect(ctx,19,19,150,150,9);
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roundedRect(ctx,53,53,49,33,10);
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roundedRect(ctx,53,119,49,16,6);
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roundedRect(ctx,135,53,49,33,10);
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roundedRect(ctx,135,119,25,49,10);
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ctx.beginPath();
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ctx.arc(37,37,13,Math.PI/7,-Math.PI/7,true);
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ctx.lineTo(31,37);
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ctx.fill();
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for(var i=0;i<8;i++){
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ctx.fillRect(51+i*16,35,4,4);
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}
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for(i=0;i<6;i++){
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ctx.fillRect(115,51+i*16,4,4);
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}
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for(i=0;i<8;i++){
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ctx.fillRect(51+i*16,99,4,4);
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}
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ctx.beginPath();
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ctx.moveTo(83,116);
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ctx.lineTo(83,102);
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ctx.bezierCurveTo(83,94,89,88,97,88);
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ctx.bezierCurveTo(105,88,111,94,111,102);
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ctx.lineTo(111,116);
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ctx.lineTo(106.333,111.333);
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ctx.lineTo(101.666,116);
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ctx.lineTo(97,111.333);
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ctx.lineTo(92.333,116);
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ctx.lineTo(87.666,111.333);
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ctx.lineTo(83,116);
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ctx.fill();
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ctx.fillStyle = "white";
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ctx.beginPath();
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ctx.moveTo(91,96);
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ctx.bezierCurveTo(88,96,87,99,87,101);
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ctx.bezierCurveTo(87,103,88,106,91,106);
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ctx.bezierCurveTo(94,106,95,103,95,101);
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ctx.bezierCurveTo(95,99,94,96,91,96);
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ctx.moveTo(103,96);
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ctx.bezierCurveTo(100,96,99,99,99,101);
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ctx.bezierCurveTo(99,103,100,106,103,106);
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ctx.bezierCurveTo(106,106,107,103,107,101);
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ctx.bezierCurveTo(107,99,106,96,103,96);
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ctx.fill();
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ctx.fillStyle = "black";
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ctx.beginPath();
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ctx.arc(101,102,2,0,Math.PI*2,true);
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ctx.fill();
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ctx.beginPath();
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ctx.arc(89,102,2,0,Math.PI*2,true);
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ctx.fill();
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}
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function roundedRect(ctx,x,y,width,height,radius){
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ctx.beginPath();
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ctx.moveTo(x,y+radius);
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ctx.lineTo(x,y+height-radius);
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ctx.quadraticCurveTo(x,y+height,x+radius,y+height);
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ctx.lineTo(x+width-radius,y+height);
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ctx.quadraticCurveTo(x+width,y+height,x+width,y+height-radius);
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ctx.lineTo(x+width,y+radius);
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ctx.quadraticCurveTo(x+width,y,x+width-radius,y);
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ctx.lineTo(x+radius,y);
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ctx.quadraticCurveTo(x,y,x,y+radius);
|
||||
ctx.stroke();
|
||||
}
|
||||
*/
|
||||
debug("here10");
|
||||
17
wsproxy.py
17
wsproxy.py
@ -20,6 +20,10 @@ def handshake(client):
|
||||
_, host = req_lines[3].split(" ")
|
||||
client.send(server_handshake % (origin, host, path))
|
||||
|
||||
def traffic(token="."):
|
||||
sys.stdout.write(token)
|
||||
sys.stdout.flush()
|
||||
|
||||
def proxy(client, target):
|
||||
cqueue = []
|
||||
tqueue = []
|
||||
@ -33,23 +37,28 @@ def proxy(client, target):
|
||||
buf = client.recv(1024)
|
||||
if len(buf) == 0: raise Exception("Client closed")
|
||||
tqueue.append(buf[1:-1])
|
||||
print "Client recv: %s (%d)" % (buf[1:-1], len(buf))
|
||||
#print "Client recv: %s (%d)" % (buf[1:-1], len(buf))
|
||||
traffic("}")
|
||||
|
||||
if target in ins:
|
||||
buf = target.recv(1024)
|
||||
if len(buf) == 0: raise Exception("Target closed")
|
||||
cqueue.append("\x00" + buf + "\xff")
|
||||
print "Target recv: %s (%d)" % (buf, len(buf))
|
||||
#print "Target recv: %s (%d)" % (buf, len(buf))
|
||||
traffic("{")
|
||||
|
||||
if cqueue and client in outs:
|
||||
while cqueue:
|
||||
print "Client send: %s" % cqueue[0]
|
||||
#print "Client send: %s" % cqueue[0]
|
||||
client.send(cqueue.pop(0))
|
||||
traffic("<")
|
||||
|
||||
if tqueue and target in outs:
|
||||
while tqueue:
|
||||
print "Target send: %s" % tqueue[0]
|
||||
#print "Target send: %s" % tqueue[0]
|
||||
sys.stdout.flush()
|
||||
target.send(tqueue.pop(0))
|
||||
traffic(">")
|
||||
|
||||
def start_server(listen_port, target_host, target_port):
|
||||
lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user