From jens.reyer@leberrohstoffe.com Mon Apr 7 13:51:21 2025 Received: (at 1633) by bugs.x2go.org; 7 Apr 2025 11:51:26 +0000 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on ymir.das-netzwerkteam.de X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HTML_MESSAGE,RCVD_IN_DNSWL_BLOCKED, RCVD_IN_VALIDITY_RPBL_BLOCKED,RCVD_IN_VALIDITY_SAFE_BLOCKED, RCVD_IN_ZEN_BLOCKED_OPENDNS,SPF_HELO_NONE,URIBL_BLOCKED, URIBL_DBL_BLOCKED_OPENDNS,URIBL_ZEN_BLOCKED_OPENDNS autolearn=ham autolearn_force=no version=3.4.4 Received: from out2.mail.core1.p4.net (out2.mail.core1.p4.net [195.98.222.229]) by ymir.das-netzwerkteam.de (Postfix) with ESMTPS id 91CBC5DA8D for <1633@bugs.x2go.org>; Mon, 7 Apr 2025 13:51:20 +0200 (CEST) Received: from relay2.mail.core1.p4.net (relay2.mail.core1.p4.net [195.98.222.167]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by out2.mail.core1.p4.net (Postfix) with ESMTPS id 4ZWSGc2GC2z7sdQ for <1633@bugs.x2go.org>; Mon, 7 Apr 2025 13:51:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=leberrohstoffe.com; s=s1-p4; t=1744026680; x=1747050680; bh=w9v4zqG3ttxrgKlc83Q3UOnL0n3DFTnAb5tjXA8jDcc=; h=Date:From:To:Message-ID:Subject:From; b=trqgLY+yrBbxxpCeXNvlMzvQI47watJlTW/VEj7qqp8SeV148c8a22upPCwZzv0a/ 4e6rXsiN4mgC/VB4uZiWgUKx7qxlfuDcGqtY8HqBHWfTHJ43se0pBx+d5uRtRTybuQ 6S+kRVb474HZxWhbfCart93KIceCDGzrDbSICgj9HPJzl9cPV9qFxJRWd6yovdDyyX dW1JeKK1EKCSbJzkDVzcjQHU3hRFcLzc3+KYZyGqgotWriV5F3q3Ryh9HxYSK/9tv5 s+5KdxUjADTRgxESXwBM9X+22gP77RX1Z8V1DWg+HuE8ecVNrV8+4xv+wfajD3L2Cl f90SHOYtgYg5w== Received: from relay2.mail.core1.p4.net (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by relay2.mail.core1.p4.net (Postfix) with ESMTPS id 4ZWSGc1D2Nz10qr for <1633@bugs.x2go.org>; Mon, 7 Apr 2025 13:51:20 +0200 (CEST) Received: from ares-mda1.core1.p4.net (ares-mda1.core1.p4.net [195.98.222.164]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by relay2.mail.core1.p4.net (Postfix) with ESMTPS id 4ZWSGc0nFDzyQ3 for <1633@bugs.x2go.org>; Mon, 7 Apr 2025 13:51:20 +0200 (CEST) Received: from 127.0.0.1 (helo=localhost.localdomain) by ares-mda1.core1.p4.net with esmtpsa (TLS1.0:ECDHE_RSA_AES_256_CBC_SHA1:256) id 1u1l0a-000f7N-0r; Mon, 07 Apr 2025 13:51:20 +0200 Date: Mon, 7 Apr 2025 13:51:19 +0200 (CEST) From: Jens Reyer To: 1633@bugs.x2go.org Message-ID: <1522497032.175025.1744026679855@195.98.208.36> In-Reply-To: References: <810710459.135614.1741783851926@195.98.208.36> <1728065184.137568.1741862572763@195.98.208.36> <1081187274.137588.1741862691938@195.98.208.36> <1748520028.138240.1741874623478@195.98.208.36> <192506419.142362.1742212383293@195.98.208.36> <999247165.134927.1741773596827@195.98.208.36> <240682715.155126.1742900373833@195.98.208.36> Subject: Re: Bug#1633: New clipboard issue in Libreoffice with X2Go MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_175023_2042375858.1744026679840" X-Priority: 3 Importance: Medium X-Mailer: Open-Xchange Mailer v7.8.2-Rev11 X-Originating-Client: open-xchange-appsuite ------=_Part_175023_2042375858.1744026679840 Content-Type: multipart/alternative; boundary="----=_Part_175024_832431758.1744026679841" ------=_Part_175024_832431758.1744026679841 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Uli, Attached a new session.log without any ibus mentioning - still the same iss= ue: only the first copy and then every second copy succeed. For this I uninstalled ibus on both client and server. The session.log is f= rom starting a terminal, then "libreoffice --calc /home/localadmin/test.ods= " and then 7 ctrl+c / ctrl+v. About the setup: Client (PC, Linux Mint 22.1, twm) and server (Proxmox VM, Debian trixie/sid= (testing/unstable), twm, libreoffice 25.2.2.2) are on the same 1Gbit LAN. = For testing so far I changed all mentioned characteristics for both server = and client (PC/VM, Linux Mint 22/22.1 / Debian, Gnome/Mate/Windows (client)= /twm, LAN/VDSL). Using a PC as server or local session helps a bit. So in my setup the relevant factor is Libreoffice 24 or above (last known g= ood version was Libreoffice 7.3.7) in a x2go session with clipboard client = to server enabled. Greets Jens >=20 > Ulrich Sibiller hat am 4. April 2025 um 0= 0:17 geschrieben: >=20 > Hi, >=20 > I have not fully understood yet what's going with your setup and will > go on with checking. >=20 > However, I see ibus-related communication which I do not see on my > setup. I have no experience with ibus or X input methods in general. = I > see ibus working with selections and _maybe_ it triggers a bug in my > code that has been undetected yet. I would like to ask you to repeat > testing after disabling/uninstalling ibus. I am wondering if you > installed that on purpose or not. >=20 > Uli >=20 > On Wed, Mar 26, 2025 at 10:55=E2=80=AFPM Ulrich Sibiller >=20 > wrote: > > >=20 > > >=20 > > thanks, review will take some time.... > >=20 > > Uli > >=20 > > On Tue, Mar 25, 2025 at 12:00=E2=80=AFPM Jens Reyer > >=20 > > wrote: > > > > >=20 > > > > >=20 > > > Hi > > >=20 > > > sorry for the late reply. I made my answers inline: > > >=20 > > > Ulrich Sibiller hat am 17. M= =C3=A4rz 2025 um 21:35 geschrieben: > > >=20 > > > Hello again, > > >=20 > > > I had a look at the logfile. It's been a while since I wo= rked on the > > > clipboard code. But I _think_ there are a few things you = should test: > > >=20 > > > restrict clipboard to text only: add X2GO_NXAGENT_DEFAULT= _OPTIONS+=3D" > > > -textclipboard" to /etc/x2go/x2goagent.options on the ser= ver side and > > > start a NEW session (no reconnect). Does that help? > > >=20 > > > No, same behavior. > > >=20 > > > But I kept this setting for all further tests. > > >=20 > > > not sure what exactly you have been doing while creating = the sessionlog. But I can seen "caja" on the server side requesting clipboa= rd. > > > Please try to run a session without caja (which is a file= manager, > > > unclear what it does with selections). > > >=20 > > > See new session.log without any caja mention, from a clie= nt with twm/xterm to a session with twm on the server. There I started xter= m, then did a "libreoffice --calc /home/localadmin/test.ods" and did severa= l ctrl+c ctrl+v in that calc document. > > >=20 > > > it _looks_ like something on the client side is requestin= g theclipboard when you are doing your tests. The question is what program > > > is doing that. If possible run a few programs on the clie= nt side, > > > preferably only a very simple session (fvwm twm or so) an= d 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 lik= e this: > > > nxagentHandleSelectionRequestFromXServer: Received > > > SelectionRequestEvent from real server: selection [529][C= LIPBOARD] > > > target [469][TARGETS] requestor > > > [display[nx,options=3D/tmp/.x2go-localadmin/C-localadmin-= 50-1742211621_stDMATE_dp24/options:50.0]/0xe09e31] > > > destination [386][GDK_SELECTION] time [13640727]. The bol= d number is > > > the requestor. You can check that with xwininfo -id on the > > > client. > > >=20 > > > The bold marking went missing, so I just tested all ids. > > >=20 > > > From client mate to server twm I always get "No such wind= ow ...", e.g. > > >=20 > > > 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. > > >=20 > > > Then I tested from the twm/xterm client to a twm/xterm se= ssion on the server, see the attached Bug1633_nxagentHandleSelectionRequest= FromXServer.log > > >=20 > > > there's an option to include the clipboard content (or ra= ther thedata being transferred) in the session log in DEBUG mode. This help= s > > > in identifying what stage we are in. Change #undef > > > PRINT_CLIPBOARD_CONTENT_ON_DEBUG to #define and recompile > > >=20 > > > Done, see new session.log. > > >=20 > > > 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 5= 000. In your > > > log I see errors like this "nxagentConvertSelection: got = new request > > > before timeout expired on previous request, notifying fai= lure 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 indi= cates 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 sugges= t to decrease > > > the timeout to 2s or so and see if that makes a differenc= e for you. > > > One thing here is strange here, though: Doing a copy in s= office on the > > > server side makes soffice the clipboard owner. So while y= ou are > > > working inside soffice there should be no communication t= o the client > > > that awaits any answer. Which again leads me to the suspi= cion that > > > there's some clipboard manager involved. > > >=20 > > > First I tried waiting for 15 seconds after copying: this = does NOT help. > > >=20 > > > Then I recompiled with #define CONVERSION_TIMEOUT 2000, s= ame behavior, see new session.log > > >=20 > > > x11 clipboard transfers are size restricted. That means t= hat biggerselections are to be transferred to the requestor in multiple pac= kets. > > > nx does not support this currently, so you are restricted= to 256kB. Is > > > it possible that your selection is bigger than that? > > >=20 > > > No, its always just a few characters. > > >=20 > > > I also see SelectionClear requests from the client side. = Which alsoindicates there's something dealing with clipboard on the client = side. > > >=20 > > > I still see SelectionClear in the new twm/xterm to twm/xt= erm session.log, but I'm not sure which side they are from. > > >=20 > > > I played around with these tools:https://github.com/phill= bush/xcliputils Using xclipowner -w you can > > > watch if the clipboard owner changes. Run that on the cli= ent and then > > > do clipboard stuff in libreoffice on the server. The owne= r as printed > > > by xclipowner should never change except for the first ti= me. If it > > > does we have another indication of a clipboard-manager-in= -the-middle > > > attack ;-) > > >=20 > > > From client Mate to server twm a successful ctrl+c result= s in > > >=20 > > > 0x03C0016A > > >=20 > > > and a failed ctrl+c results in a > > >=20 > > > 0x00000000 > > > 0x03C0016A > > >=20 > > > From twm/xterm client to a twm/xterm session on the serve= r both failed and successful ctrl+c results in > > >=20 > > > 0x00E0016A > > >=20 > > > Thanks and greets > > >=20 > > > _______________________________________________ > > > x2go-dev mailing list > > > x2go-dev@lists.x2go.org > > > https://lists.x2go.org/listinfo/x2go-dev > > >=20 > > > > >=20 > > >=20 ------=_Part_175024_832431758.1744026679841 MIME-Version: 1.0 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Hi Uli,

Attached a new session.log without any ibus = mentioning - still the same issue: only the first copy and then every secon= d copy succeed.

For this I uninstalled ibus on both client and serve= r. The session.log is from starting a terminal, then "libreoffice --cal= c /home/localadmin/test.ods" and then 7 ctrl+c / ctrl+v.

About t= he setup:

Client (PC, Linux Mint 22.1, twm) and server (Proxmox VM, D= ebian trixie/sid (testing/unstable), twm, libreoffice 25.2.2.2) are on the = same 1Gbit LAN. For testing so far I changed all mentioned characteristics = for both server and client (PC/VM, Linux Mint 22/22.1 / Debian, Gnome/Mate/= Windows (client)/twm, LAN/VDSL). Using a PC as server or local session help= s a bit.

So in my setup the relevant factor is Libreoffice 24 or abov= e (last known good version was Libreoffice 7.3.7) in a x2go session with cl= ipboard client to server enabled.

Greets
Jens


Ulrich Sibiller <ulrich.sibiller@gmail.com> hat am 4. Apr= il 2025 um 00:17 geschrieben:

Hi,

I have not fully understood y= et what's going with your setup and will
go on with checking.

= However, I see ibus-related communication which I do not see on my
setup= . I have no experience with ibus or X input methods in general. I
see ib= us working with selections and _maybe_ it triggers a bug in my
code that= has been undetected yet. I would like to ask you to repeat
testing afte= r disabling/uninstalling ibus. I am wondering if you
installed that on p= urpose or not.

Uli

On Wed, Mar 26, 2025 at 10:55=E2=80=AFPM Ulr= ich Sibiller

<ulrich.sibiller@gmail.com> wrote:
>

<= blockquote>

thanks, review will take some time....

Uli

On Tue= , Mar 25, 2025 at 12:00=E2=80=AFPM Jens Reyer

<jens.reyer@leberro= hstoffe.com> wrote:
>

Hi

sorry for the l= ate reply. I made my answers inline:

Ulrich Sibiller <ulrich.sibi= ller@gmail.com> hat am 17. März 2025 um 21:35 geschrieben:

H= ello 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_DEFAU= LT_OPTIONS+=3D"
-textclipboard" to /etc/x2go/x2goagent.options o= n the server side and
start a NEW session (no reconnect). Does that help= ?

No, same behavior.

But I kept this setting for all further te= sts.

not sure what exactly you have been doing while creating the ses= sionlog. But I can seen "caja" on the server side requesting clipbo= ard.
Please try to run a session without caja (which is a file manager,<= br>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 th= e server. There I started xterm, then did a "libreoffice --calc /home/l= ocaladmin/test.ods" and did several ctrl+c ctrl+v in that calc document= .

it _looks_ like something on the client side is requesting theclipb= oard when you are doing your tests. The question is what program
is doin= g that. If possible run a few programs on the client side,
preferably on= ly a very simple session (fvwm twm or so) and an xterm.
Run x2goclient f= rom 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:
nxa= gentHandleSelectionRequestFromXServer: Received
SelectionRequestEvent fr= om real server: selection [529][CLIPBOARD]
target [469][TARGETS] request= or
[display[nx,options=3D/tmp/.x2go-localadmin/C-localadmin-50-174221162= 1_stDMATE_dp24/options:50.0]/0xe09e31]
destination [386][GDK_SELECTION] = time [13640727]. The bold number is
the requestor. You can check that wi= th xwininfo -id <number> on the
client.

The bold marking w= ent missing, so I just tested all ids.

From client mate to server twm= I always get "No such window ...", e.g.

me@client:~$ xwininf= o -id 531
X Error: 9: Bad Drawable
Request Major code: 14
Resource= ID in failed request: 0x213
Serial number of failed request: 3
xwinin= fo: error: No such window with id 0x213.

Then I tested from the twm/x= term 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 recomp= ile

Done, see new session.log.

while at it you could also try t= o 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 "nxagentConvertSele= ction: got new request
before timeout expired on previous request, notif= ying failure to
client [20] (addr [0x557c39ea2f40] PID [18630] Cmd
[/= usr/lib/libreoffice/program/soffice.bin])". This means that the
prev= ious clipboard-related communication has not finished when soffice
start= s another request which then is denied. So this indicates that
some answ= er from the client side is still due. I suspect that this
answer is neve= r sent so your diagnosis that every second paste is
working might in fac= t 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 an= d 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 c= lipboard 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 behavi= or, 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 restric= ted to 256kB. Is
it possible that your selection is bigger than that?

No, its always just a few characters.

I also see SelectionClear r= equests from the client side. Which alsoindicates there's something dea= ling 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 sid= e 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 ser= ver. The owner as printed
by xclipowner should never change except for t= he first time. If it
does we have another indication of a clipboard-mana= ger-in-the-middle
attack ;-)

From client Mate to server twm a succ= essful ctrl+c results in

0x03C0016A

and a failed ctrl+c results= in a

0x00000000
0x03C0016A

From twm/xterm client to a twm/x= term session on the server both failed and successful ctrl+c results in

=

0x00E0016A

Thanks and greets

_______________________________= ________________
x2go-dev mailing list
x2go-dev@lists.x2go.org
https://lists.x2go.org/li= stinfo/x2go-dev

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