[Libvncserver-common] Problem with X11VNC and Xorg 1.7.3

[Pavel P. <ra...@gm...>]

Hello,

I tried to use configuration described in
http://www.karlrunge.com/x11vnc/xdm_one_shot.html at my Ubuntu 9.10
server.
It has Xorg 1.6.4, and I used X11VNC version 0.9.9 from tarball.
All worked fine, but now I have to move that installation on Arch
Linux server, which has Xorg 1.7.3.
I did the similar things as described in the article above, but get
'vncviewer: read: Connection reset by peer' when was trying to
connect.
I tried to start x11vnc without -inetd and examine the log. And it
seems that I've got the reason:


==================================================================================

/usr/bin/Xvfb :20 -screen 0 640x480x24 +kb -cc 4 -once -query
localhost
Unrecognized option: +kb
use: X [:<display>] [option]
-a #                   mouse acceleration (pixels)
-ac                    disable access control restrictions
-audit int             set audit trail level
-auth file             select authorization file
-br                    create root window with black background
+bs                    enable any backing store support
-bs                    disable any backing store support
-c                     turns off key-click
c #                    key-click volume (0-100)
-cc int                default color visual class
-nocursor              disable the cursor
-core                  generate core dump on fatal error
-dpi int               screen resolution in dots per inch
-dpms                  disables VESA DPMS monitor control
-deferglyphs [none|all|16] defer loading of [no|all|16-bit] glyphs
-f #                   bell base (0-100)
-fc string             cursor font
-fn string             default font name
-fp string             default font path
-help                  prints message with these options
-I                     ignore all remaining arguments
-ld int                limit data space to N Kb
-lf int                limit number of open files to N
-ls int                limit stack space to N Kb
-logo                  enable logo in screen saver
nologo                 disable logo in screen saver
-nolisten string       don't listen on protocol
-noreset               don't reset after last client exists
-reset                 reset after last client exists
-p #                   screen-saver pattern duration (minutes)
-pn                    accept failure to listen on all ports
-nopn                  reject failure to listen on all ports
-r                     turns off auto-repeat
r                      turns on auto-repeat
-render [default|mono|gray|color] set render color alloc policy
-retro                 start with classic stipple and cursor
-s #                   screen-saver timeout (minutes)
-t #                   mouse threshold (pixels)
-terminate             terminate at server reset
-to #                  connection time out
-tst                   disable testing extensions
ttyxx                  server started from init on /dev/ttyxx
v                      video blanking for screen-saver
-v                     screen-saver without video blanking
-wm                    WhenMapped default backing-store
-wr                    create root window with white background
-maxbigreqsize         set maximal bigrequest size
+xinerama              Enable XINERAMA extension
-xinerama              Disable XINERAMA extension
-dumbSched             Disable smart scheduling, enable old behavior
-schedInterval int     Set scheduler interval in msec
+extension name        Enable extension
-extension name        Disable extension
-query host-name       contact named host for XDMCP
-broadcast             broadcast for XDMCP
-multicast [addr [hops]] IPv6 multicast for XDMCP
-indirect host-name    contact named host for indirect XDMCP
-port port-num         UDP port number to send messages to
-from local-address    specify the local address to connect from
-once                  Terminate server after one session
-class display-class   specify display class to send in manage
-cookie xdm-auth-bits  specify the magic cookie for XDMCP
-displayID display-id  manufacturer display ID for request
[+-]accessx [ timeout [ timeout_mask [ feedback [ options_mask] ] ] ]
                       enable/disable accessx key sequences
-ardelay               set XKB autorepeat delay
-arinterval            set XKB autorepeat interval
-screen scrn WxHxD     set screen's width, height, depth
-pixdepths list-of-int support given pixmap depths
+/-render                  turn on/of RENDER extension support(default on)
-linebias n            adjust thin line pixelization
-blackpixel n          pixel value for black
-whitepixel n          pixel value for white
-fbdir directory       put framebuffers in mmap'ed files in directory
-shmem                 put framebuffers in shared memory

Fatal server error:
Unrecognized option: +kb

18/01/2010 18:57:12 wait_for_client: read failed: /bin/sh
/tmp/x11vnc-find_display.zGmYCK Xvfb.xdmcp
18/01/2010 18:57:12 fgets: Bad file descriptor

==================================================================================

As one can see, x11vnc tried to invoke X with +kb option while this
option no longer supported by X!
I checked out 'man Xserver' pages for 1.6.4 and 1.7.3 versions and
found that indeed 1.6.4 yet supports it while 1.7.3 already not.
As it appeared after brief examination of x11vnc-0.9.10 source, +kb
option had been hardcoded into one of source files.
Is it a bug or a feature? Is there an easier way for me to avoid this
bug without patching and recompiling the source?

-- 
Pavel Parkhomenko