Hi sorry for the late reply. I made my answers inline:
> > Ulrich Sibiller <ulrich.sibil...@gmail.com> hat am 17. März 2025 um 21:35 > geschrieben: > > Hello again, > > I had a look at the logfile. It's been a while since I worked on the > clipboard code. But I _think_ there are a few things you should test: > > * restrict clipboard to text only: add X2GO_NXAGENT_DEFAULT_OPTIONS+=" > -textclipboard" to /etc/x2go/x2goagent.options on the server side > and > start a NEW session (no reconnect). Does that help? > No, same behavior. But I kept this setting for all further tests. > * not sure what exactly you have been doing while creating the > sessionlog. But I can seen "caja" on the server side requesting clipboard. > Please try to run a session without caja (which is a file manager, > unclear what it does with selections). > See new session.log without any caja mention, from a client with twm/xterm to a session with twm on the server. There I started xterm, then did a "libreoffice --calc /home/localadmin/test.ods" and did several ctrl+c ctrl+v in that calc document. > * it _looks_ like something on the client side is requesting > theclipboard when you are doing your tests. The question is what program > is doing that. If possible run a few programs on the client side, > preferably only a very simple session (fvwm twm or so) and an xterm. > Run x2goclient from there. > To find out what program on the client side is requesting the > clipboard you can check the server log file for lines like this: > nxagentHandleSelectionRequestFromXServer: Received > SelectionRequestEvent from real server: selection [529][CLIPBOARD] > target [469][TARGETS] requestor > > [display[nx,options=/tmp/.x2go-localadmin/C-localadmin-50-1742211621_stDMATE_dp24/options:50.0]/0xe09e31] > destination [386][GDK_SELECTION] time [13640727]. The bold number is > the requestor. You can check that with xwininfo -id <number> on the > client. > The bold marking went missing, so I just tested all ids. >From client mate to server twm I always get "No such window ...", e.g. me@client:~$ xwininfo -id 531 X Error: 9: Bad Drawable Request Major code: 14 ResourceID in failed request: 0x213 Serial number of failed request: 3 xwininfo: error: No such window with id 0x213. Then I tested from the twm/xterm client to a twm/xterm session on the server, see the attached Bug1633_nxagentHandleSelectionRequestFromXServer.log > * there's an option to include the clipboard content (or rather > thedata being transferred) in the session log in DEBUG mode. This helps > in identifying what stage we are in. Change #undef > PRINT_CLIPBOARD_CONTENT_ON_DEBUG to #define and recompile > Done, see new session.log. > * while at it you could also try to change the timeout for > theclipboard transfer. I hardcoded 5s when I wrote all this and it was ok > for me ever since. But YMMV. #define CONVERSION_TIMEOUT 5000. In > your > log I see errors like this "nxagentConvertSelection: got new request > before timeout expired on previous request, notifying failure to > client [20] (addr [0x557c39ea2f40] PID [18630] Cmd > [/usr/lib/libreoffice/program/soffice.bin])". This means that the > previous clipboard-related communication has not finished when > soffice > starts another request which then is denied. So this indicates that > some answer from the client side is still due. I suspect that this > answer is never sent so your diagnosis that every second paste is > working might in fact resemble a 5s pattern. Meaning: you can only > successfully paste every 5s, but not quicker. So I suggest to > decrease > the timeout to 2s or so and see if that makes a difference for you. > One thing here is strange here, though: Doing a copy in soffice on > the > server side makes soffice the clipboard owner. So while you are > working inside soffice there should be no communication to the > client > that awaits any answer. Which again leads me to the suspicion that > there's some clipboard manager involved. > First I tried waiting for 15 seconds after copying: this does NOT help. Then I recompiled with #define CONVERSION_TIMEOUT 2000, same behavior, see new session.log > * x11 clipboard transfers are size restricted. That means that > biggerselections are to be transferred to the requestor in multiple packets. > nx does not support this currently, so you are restricted to 256kB. > Is > it possible that your selection is bigger than that? > No, its always just a few characters. > * I also see SelectionClear requests from the client side. Which > alsoindicates there's something dealing with clipboard on the client side. > I still see SelectionClear in the new twm/xterm to twm/xterm session.log, but I'm not sure which side they are from. > * I played around with these > tools:https://github.com/phillbush/xcliputils Using xclipowner -w you can > watch if the clipboard owner changes. Run that on the client and > then > do clipboard stuff in libreoffice on the server. The owner as > printed > by xclipowner should never change except for the first time. If it > does we have another indication of a clipboard-manager-in-the-middle > attack ;-) > >From client Mate to server twm a successful ctrl+c results in 0x03C0016A and a failed ctrl+c results in a 0x00000000 0x03C0016A >From twm/xterm client to a twm/xterm session on the server both failed and >successful ctrl+c results in 0x00E0016A Thanks and greets
user@server:~$ grep nxagentHandleSelectionRequestFromXServer /tmp/.x2go-localadmin/C-localadmin-50-1742895429_stDtwm_dp24/session.log nxagentHandleSelectionRequestFromXServer: Received SelectionRequestEvent from real server: selection [529][CLIPBOARD] target [342][UTF8_STRING] requestor [display[nx,options=/tmp/.x2go-localadmin/C-localadmin-50-1742895429_stDtwm_dp24/options:50.0]/0xa0016a] destination [603][NX_CUT_BUFFER_SERVER] time [0] nxagentHandleSelectionRequestFromXServer: this event has been sent by nxagent! nxagentHandleSelectionRequestFromXServer: no local owner for selection [529] - denying request. nxagentHandleSelectionRequestFromXServer: Received SelectionRequestEvent from real server: selection [529][CLIPBOARD] target [31][STRING] requestor [display[nx,options=/tmp/.x2go-localadmin/C-localadmin-50-1742895429_stDtwm_dp24/options:50.0]/0xa0016a] destination [603][NX_CUT_BUFFER_SERVER] time [0] nxagentHandleSelectionRequestFromXServer: this event has been sent by nxagent! nxagentHandleSelectionRequestFromXServer: no local owner for selection [529] - denying request. nxagentHandleSelectionRequestFromXServer: Received SelectionRequestEvent from real server: selection [529][CLIPBOARD] target [342][UTF8_STRING] requestor [display[nx,options=/tmp/.x2go-localadmin/C-localadmin-50-1742895429_stDtwm_dp24/options:50.0]/0xa0016a] destination [603][NX_CUT_BUFFER_SERVER] time [0] nxagentHandleSelectionRequestFromXServer: this event has been sent by nxagent! nxagentHandleSelectionRequestFromXServer: no local owner for selection [529] - denying request. nxagentHandleSelectionRequestFromXServer: Received SelectionRequestEvent from real server: selection [529][CLIPBOARD] target [31][STRING] requestor [display[nx,options=/tmp/.x2go-localadmin/C-localadmin-50-1742895429_stDtwm_dp24/options:50.0]/0xa0016a] destination [603][NX_CUT_BUFFER_SERVER] time [0] nxagentHandleSelectionRequestFromXServer: this event has been sent by nxagent! nxagentHandleSelectionRequestFromXServer: no local owner for selection [529] - denying request. user@client:~$ xwininfo -id 529 X Error: 9: Bad Drawable Request Major code: 14 ResourceID in failed request: 0x211 Serial number of failed request: 3 xwininfo: error: No such window with id 0x211. user@client:~$ xwininfo -id 31 X Error: 9: Bad Drawable Request Major code: 14 ResourceID in failed request: 0x1f Serial number of failed request: 3 xwininfo: error: No such window with id 0x1f. user@client:~$ xwininfo -id 0xa0016a xwininfo: Window id: 0xa0016a (has no name) Absolute upper-left X: 2 Absolute upper-left Y: 29 Relative upper-left X: 0 Relative upper-left Y: 0 Width: 1919 Height: 1200 Depth: 24 Visual: 0x21 Visual Class: TrueColor Border width: 0 Class: InputOutput Colormap: 0xa00151 (not installed) Bit Gravity State: ForgetGravity Window Gravity State: NorthWestGravity Backing Store State: NotUseful Save Under State: no Map State: IsViewable Override Redirect State: no Corners: +2+29 -1919+29 -1919--29 +2--29 -geometry 1919x1200+0+0 user@client:~$ xwininfo -id 603 X Error: 9: Bad Drawable Request Major code: 14 ResourceID in failed request: 0x25b Serial number of failed request: 3 xwininfo: error: No such window with id 0x25b.
Bug1633_session.log.gz
Description: GNU Zip compressed data
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