Remote GUI

Transcription

Remote GUI

Cross-platform UI access
VNC and rdesktop
David Morgan
© David Morgan 2003,2004
Running the other guy’s software
Do it on your machine
Do it on his machine
(today’s topic)
1
Doing it on your machine
Run something that emulates his whole OS
– VMWare
– Lin4Win
Run something that emulates the system
service/API portion of his OS
– wine
– cygwin
Run something that emulates the behavior
of certain particular applications of his
– OpenOffice
-- Go ahead and turn his machine off! -© David Morgan 2003,2004
Doing it on his machine
Run nothing of his on your machine
– not his OS
– not his API
– not his applications
You just access his machine’s I/O
On your machine, run the software for that
-- Turn his machine off? you better not! -© David Morgan 2003,2004
2
Accessing I/O: examples
lin-to-win
character
mode
graphic
mode
-VNC
rdesktop
win-to-lin
telnet, ssh, etc
VNC
Accessing his graphical I/O
-- with VNC or rdesktop
3
VNC
RFB (Remote Frame Buffer) protocol
by AT&T Laboratories, U.K. (defunct)
server – ports 5900- for displays 0 plus http server – 100 ports lower
– allows a browser as client
rdesktop
RDP (Remote Desktop) Protocol
– by Microsoft
based on ITU T-120 family of protocols
– “Data protocols for multimedia conferencing”
– by International Telecommunications Union
server - port 3389
4
Microsoft Terminal Services (TS)
is an RDP implementation
rdesktop, an RDP client, runs against TS
TS also, more recently, dubbed “Remote
Desktop Connection”
Setting up 2 VNC servers
[root@EMACH1 root]# su david -c vncserver
run a server instance as user david
New 'X' desktop is EMACH1:1
Starting applications specified in /home/david/.vnc/xstartup
Log file is /home/david/.vnc/EMACH1:1.log
[root@EMACH1 root]# su nitsa -c vncserver
and another as user nitsa
Starting applications specified in /home/nitsa/.vnc/xstartup
Log file is /home/nitsa/.vnc/EMACH1:2.log
displays
[root@EMACH1 root]# ps -ef | grep Xvnc
david
3047
1 0 09:23 tty1
00:00:00 Xvnc :1 -desktop X –httpd
/usr/share/vnc/classes -auth /home/david/.Xauthority -geometry 1024x768 -depth 8
-rfbwait 120000 -rfbauth /home/david/.vnc/passwd -rfbport 5901 -fp unix/:7100
nitsa
3061
1 1 09:24 tty1
/usr/share/vnc/classes -auth /home/nitsa/.Xauthority -geometry 1024x768 -depth 8
-rfbwait 120000 -rfbauth /home/nitsa/.vnc/passwd -rfbport 5902 -fp unix/:7100
root
3118 1488 0 09:24 tty1
00:00:00 grep Xvnc
ports
5
Setting up 2 VNC servers
One server
–
–
–
–
user david
on X display 1
via vnc on port 5901 or http on port 5801
runs david’s “xstartup”s window manager etc
the other server
–
–
–
–
user nitsa
on X display 2
via vnc on port 5902 or http on port 5802
runs nitsa’s “xstartup”s window manager etc
lin desktop from win desktop (via vnc)
vnc)
ran VNC viewer against
192.168.3.7:2 (display 2)
192.168.3.7:1 (display 1)
6
lin desktop from win desktop (via http)
ran Internet Explorer against
ports 5801(display 1)
and 5802 (display 2)
lin desktop from win desktop (via http)
(Note: / home/david/.vnc/xstartup
changed to call gnome instead of twm,
relative to earlier slied)
7
Finger on the server pulse…
[root@EMACH1 root]# su david -c vncserver
[root@EMACH1 root]#
[root@EMACH1 root]# tail
28/10/03 20:08:53 httpd:
28/10/03 20:08:53 httpd:
28/10/03 20:09:00 httpd:
28/10/03
28/10/03
28/10/03
28/10/03
28/10/03
28/10/03
28/10/03
28/10/03
28/10/03
20:09:14
20:09:14
20:09:14
20:09:14
20:09:14
20:09:14
20:09:14
20:09:14
20:09:14
-f /home/david/.vnc/EMACH1\:1.log
get '' for 192.168.3.3
defaulting to 'index.vnc'
get 'vncviewer.jar' for 192.168.3.3
there’s a log file
watch dynamically
Got connection from client 192.168.3.3
Protocol version 3.3
Using tight encoding for client 192.168.3.3
Enabling X-style cursor updates for client 192.168.3.3
Enabling LastRect protocol extension for client 192.168.3.3
Pixel format for client 192.168.3.3:
8 bpp, depth 8
true colour: max r 7 g 7 b 3, shift r 0 g 3 b 6
no translation needed
Stopping server
[david@EMACH1 .vnc]$ vncserver
born as display :1
[david@EMACH1 .vnc]$ ps -ef | grep Xvnc | grep -v grep
david
2777
1 0 22:04 pts/0
/usr/share/vnc/classes -auth /root/.Xauthority -geometry 1024x768 -depth 8
–rfbwait 120000 -rfbauth /home/david/.vnc/passwd -rfbport 5901 -fp unix/:7100
[david@EMACH1 .vnc]$
[david@EMACH1 .vnc]$ vncserver -kill :1
kill, by its display number
Killing Xvnc process ID 2777
[david@EMACH1 .vnc]$ ps -ef | grep Xvnc | grep -v grep
8
win desktop from lin desktop (via rdesktop)
rdesktop)
win desktop from lin desktop (via vnc)
vnc)
9
X client/server model, VNC and
-OR-
X Client/application
X Server /
service
VNC vis-à-vis X
X11 protocol
port 6000
X Client/application
X Server /
service
VNC protocol
port 5900
vncviewer
VNC Client
vncserver
(Xvnc)
VNC Server
10
Why VNC over X?
widely cross-platform
– clients and servers for UNIX, Win, Mac,
mainframes, handhelds
lightweight (low bandwidth)
persistent desktops
– close viewer
– relaunch later, to previous desktop unaltered
“vncviewer 192.168.3.7” from …3.4
11
capturing screen images
xwd
– “xwd –root –out screenimage.xwd”
ImageMagick
– “display screenimage.xwd”
– when image appears left click, file/save/format
to convert to another format (jpg, gif, etc)
see man xwd, man ImageMagick
VNC sources
http://www.tightvnc.com
http://www.realvnc.com/
http://networking.earthweb.com/netos/print.php/1470341
http://www.linux-mag.com/2003-03/guru_01.html
/usr/share/doc/kernel-doc-*/fb/framebuffer.txt
12
rdesktop sources
http://www.rdesktop.org/
http://www.microsoft.com/windows2000/techinf
o/howitworks/terminal/rdpfandp.asp
http://www.itu.int/ITU-T/
THE END
13
into win from lin
rdesktop 192.168.3.3
rdesktop –F 192.168.3.3
– how to escape fullscreen?
vncviewer 192.168.3.3
– F8 to toggle fullscreen
14

Remote GUI

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