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docu and cursors in examples.

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dscho 23 years ago
parent 5c3eae9237
commit fb53d48120
5 changed files with 116 additions and 48 deletions
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77
README
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@ -5,8 +5,9 @@ What is it?
-----------
VNC is set of programs using the RFB (Remote Frame Buffer) protocol. They
are designed to "export" a frame buffer via net. It is already in wide use
for administration, but it is not that easy to make a server yourself.
are designed to "export" a frame buffer via net (if you don't know VNC, I
suggest you read "Basics" below). It is already in wide use for
administration, but it is not that easy to program a server yourself.
This has been changed by LibVNCServer.
@ -175,7 +176,77 @@ History
LibVNCServer is based on Tridia VNC and OSXvnc, which in turn are based on
the original code from ORL/AT&T.
VNC fascinated me from t
When I began hacking with computers, my first interest was speed. So, when I
got around assembler, I programmed the floppy to do much of the work, because
it's clock rate was higher than that of my C64. This was my first experience
with client/server techniques.
When I came around Xwindows (much later), I was at once intrigued by the
elegance of such connectedness between the different computers. I used it
a lot - not the least priority lay on games. However, when I tried it over
modem from home, it was no longer that much fun.
When I started working with ASP (Application Service Provider) programs, I
tumbled across Tarantella and Citrix. Being a security fanatic, the idea of
running a server on windows didn't appeal to me, so Citrix went down the
basket. However, Tarantella has it's own problems (security as well as the
high price). But at the same time somebody told me about this "great little
administrator's tool" named VNC. Being used to windows programs' sizes, the
surprise was reciprocal inverse to the size of VNC!
At the same time, the program "rdesktop" (a native Linux client for the
Terminal Services of Windows servers) came to my attention. There where even
works under way to make a protocol converter "rdp2vnc" out of this. However,
my primary goal was a slow connection and rdp2vnc could only speak RRE
encoding, which is not that funny with just 5kB/s. Tim Edmonds, the original
author of rdp2vnc, suggested that I adapt it to Hextile Encoding, which is
better. I first tried that, but had no success at all (crunchy pictures).
Also, I liked the idea of an HTTP server included and possibly other
encodings like the Tight Encodings from Const Kaplinsky. So I started looking
for libraries implementing a VNC server where I could steal what I can't make.
I found some programs based on the demo server from AT&T, which was also the
basis for rdp2vnc (can only speak Raw and RRE encoding). There were some
rumors that GGI has a VNC backend, but I didn't find any code, so probably
there wasn't a working version anyway.
All of a sudden, everything changed: I read on freshmeat that "OSXvnc" was
released. I looked at the code and it was not much of a problem to work out
a simple server - using every functionality there is in Xvnc. It became clear
to me that I *had* to build a library out of it, so everybody can use it.
Every change, every new feature can propagate to every user of it.
It also makes everything easier:
You don't care about the cursor, once set (or use the standard cursor).
You don't care about those sockets. You don't care about encodings.
You just change your frame buffer and inform the library about it. Every once
in a while you call rfbProcessEvents and that's it.
Basics
------
VNC (Virtual network computing) works like this: You set up a server and can
connect to it via vncviewers. The communication uses a protocol named RFB
(Remote Frame Buffer). If the server supports HTTP, you can also connect
using a java enabled browser. In this case, the server sends back a
vncviewer applet with the correct settings.
There exist several encodings for VNC, which are used to compress the regions
which have changed before they are sent to the client. A client need not be
able to understand every encoding, but at least Raw encoding. Which encoding
it understands is negotiated by the RFB protocol.
The following encodings are known to me:
Raw, RRE, CoRRE, Hextile, CopyRect from the original AT&T code and
Tight, ZLib, LastRect, XCursor, RichCursor from Const Kaplinsky et al.
If you are using a modem, you want to try the "new" encodings. Especially
with my 56k modem I like ZLib or Tight with Quality 0. In my tests, it even
beats Tarantella.
There is the possibility to set a password, which is also negotiated by the
RFB protocol, but IT IS NOT SECURE. Anybody sniffing your net can get the
password. You really should tunnel through SSH.
License
-------

4
TODO
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@ -3,18 +3,20 @@ immediate:
fix bug in http (java) client with big endian server: byte swapping is broken
cursor "smears" sometimes when not using cursor encoding
really support pthreads.
in the works:
-------------
adapt rdp2vnc (rdesktop)
optionally dont draw rich cursors as xcursors
use sraRegion from rdp2vnc instead of miregion, because it is much smaller
use sraRegion from Wez instead of miregion, because it is much smaller
later:
------
udp
autoconf
rfbCloseClient, rfbConnect, ConnectToTcpAddr
CORBA
translate.c: warning about non 8-bit colourmaps

34
example.c
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@ -241,42 +241,42 @@ void MakeRichCursor(rfbScreenInfoPtr rfbScreen)
" xxxxxx "
" xxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxx xxxxxxxx xxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxx xxxxxxxxxxx xxxxxxx "
" xxxx xxxxxxxxx xxxxxx "
" xxxxx xxxxxxxxxxx xxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxx xxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxx xxxxxxxxxxxxxx "
" xxxxxxxxxx xxxxxxxxxxxx "
" xxxxxxxxx xxxxxxxxx "
" xxxxxxxxxx xxxxxxxxx "
" xxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxx "
" xxxx xxxxxxxxxxxxx "
" xx x xxxxxxxxxxx "
" xxxxxxxxxxxx "
" xxxxxxxxxxxx "
" xx xxxxxxxxxxx "
" xxx xxxxxxxxxxx "
" xxxx xxxxxxxxxxx "
" xxxxxx xxxxxxxxxxxxx "
" xxxxxx xxxxxxxxxxxx "
" xxxxxxxxxxxxxxxxxxxxxx "
" xxxxxxxxxxxxxxxx "
" ";
c=rfbScreen->cursor = rfbMakeXCursor(w,h,bitmap,0);
c->xhot = 2; c->yhot = 10;
c=rfbScreen->cursor = rfbMakeXCursor(w,h,bitmap,bitmap);
c->xhot = 16; c->yhot = 24;
c->richSource = malloc(w*h*bpp);
for(j=0;j<h;j++) {
for(i=0;i<w;i++) {
c->richSource[j*w*bpp+i*bpp+0]=0; //i*0xff/w;
c->richSource[j*w*bpp+i*bpp+1]=0;
c->richSource[j*w*bpp+i*bpp+0]=i*0xff/w;
c->richSource[j*w*bpp+i*bpp+1]=(i+j)*0xff/(w+h);
c->richSource[j*w*bpp+i*bpp+2]=j*0xff/h;
c->richSource[j*w*bpp+i*bpp+3]=0;
}

28
main.c
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@ -306,29 +306,17 @@ void defaultSetXCutText(char* text, int len, rfbClientPtr cl)
static rfbCursor myCursor =
{
//width: 8, height: 7, xhot: 3, yhot: 3,
width: 8, height: 7, xhot: 3, yhot: 3,
source: "\000\102\044\030\044\102\000",
mask: "\347\347\176\074\176\347\347",
/*
width: 8, height: 7, xhot: 0, yhot: 0,
//source: "\000\102\044\030\044\102\000",
//mask: "\347\347\176\074\176\347\347",
source: "\000\074\176\146\176\074\000",
mask: "\176\377\377\377\377\377\176",
*/
foreRed: 0, foreGreen: 0, foreBlue: 0,
backRed: 0xffff, backGreen: 0xffff, backBlue: 0xffff,
#define D "\000\000\000\000"
#define R "\377\000\000\000"
#define G "\000\377\000\000"
#define B "\000\000\377\000"
#define S "\377\377\000\000"
#define H "\000\377\377\000"
#define C "\377\000\377\000"
richSource: 0
/*D D D D D D D D
D D R R R R D D
D S S S S S S D
D G G D D G G D
D H H H H H H D
D D B B B B D D
D D D D D D D D*/
};
rfbCursorPtr defaultGetCursorPtr(rfbClientPtr cl)
@ -435,6 +423,12 @@ rfbScreenInfoPtr rfbGetScreen(int argc,char** argv,
return(rfbScreen);
}
void rfbScreenCleanup(rfbScreenInfoPtr rfbScreen)
{
/* TODO */
free(rfbScreen);
}
void rfbInitServer(rfbScreenInfoPtr rfbScreen)
{
rfbInitSockets(rfbScreen);

3
rfb.h
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@ -612,7 +612,8 @@ extern void rfbScreenCleanup(rfbScreenInfoPtr screenInfo);
/* call one of these two functions to service the vnc clients.
usec are the microseconds the select on the fds waits.
if you are using the event loop, set this to some value > 0. */
if you are using the event loop, set this to some value > 0, so the
server doesn't get a high load just by listening. */
extern void rfbRunEventLoop(rfbScreenInfoPtr screenInfo, long usec, Bool runInBackground);
extern void rfbProcessEvents(rfbScreenInfoPtr screenInfo,long usec);

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