Impressive diagnostics!
For those server messages to client before authentification: isn't it better
stock these messages in a buffer? In this way, we could avoid loss of possibly
important messages, no?
> -----Message d'origine-----
> De : [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> Envoyi : mercredi 26 mai 2004 16:30
> @ : [EMAIL PROTECTED]
> Objet : Unknown VNC authentication result - BUG! Reason found!
>
> After the detection (with ethereal) of the troubling 0x02-byte while the
> authentication procedure, I had a closer look at the RFB protocol.
> (I should have looked there much earIyer!)
> In the documentation of the server to client messages the disturbing one
> byte-message was shortly discribed as BELL!
>
> Now the reason of the "Unknown VNC authentication result" -error is
> obvious:
> At my linux vncserver I wrote a simple application (surveying the server
> logfile) that launches a Xdisplay process with a bell (!), everytime the
> server is connected.
>
> So when the bell message was send during the authentication procedure,
> while the client was wating for the authentication result, teh client read
> the bell message as first byte (0x02) and the rest three bytes (0x000000)
> from of the correct authentication result so that the result was
> interpreted as 0x02000000 (dec. 33554432 ).
> If there were further bell messages during the authentication procedure,
> the return value varied like dercribed in my posts before.
>
> I think this effect is only at the unix-server (Xserver).
> I wrote a very simple test program to make the error obvious (bell.c):
>
> #include <stdlib.h>
> #include <stdio.h>
>
> void main(){
> while (1){
> fprintf(stdout,"\a--bell--\n");
> fflush(stdout);
> sleep(1);
> }
> }
>
> If you compile this program (eg "cc bell.c -o bell") and execute it in a
> xterm of the Xvnc-Screen and disconnect,
> you should have problems to reconnect with report of the "Unknown VNC
> authentication result"
>
> So the bug will be simply fixed: the server messages to the new client
> must be suppressed until the authentication result aof the server was
> sent.
>
> In my application of the vncserver there is a process with a alarm bell.
> It would be nice if the bug is fixed soon.
> So long I have to quiet my bells on the server (hi!)
>
> Bernd M|ller *:o)
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