xterm does not support osc 52

Question

I use xterm that comes with XQuartz on my macbook. However OSC 52 control sequence doesn't seem to work. Here's how to repro:

open xterm
in the shell, issue printf '\e]52;c;%s\007' $(printf 'test off' | base64)
try to "paste" in somewhere else, e.g., TextEdit

I don't see the text "test off" being copied in TextEdit. So seems my xterm's OSC 52 support is broken.

How can I fix it or further root cause it?

from these sources, it looks like xterm does support OSC 52:

ctlseqs.html tells you why. You'd need to enable it which would be an unwise thing to do as that would introduce security vulnerabilities. — Stéphane Chazelas, Aug 16 '21 at 09:32

KFL · Answer 1 · 2022-08-04T17:05:26.383

4

As commented by Stéphane, xterm does support this feature. You can enable it from the Font Menu -> allow window ops, or by xresource string:

allowWindowOps: true

This is documented in xterm's man page.

One can selective disallow a subset of window ops as @cyqsimon mentioned: with disallowedWindowOps (see man xterm). However I have not had time to figure out the proper ops to disallow to only allow-list copy/paste ops.

edited Aug 04 '22 at 17:05

answered Aug 17 '21 at 07:13

KFL

269

1

Those WindowOps are disabled for good reason though, some even worse from a security standpoint than OSC 52 (which allows applications to produce output that will set selections, or dump them as if input on the keyboard). You may want to restrict which window op you want allowed with disallowedWindowOps instead. Only removing SetSelection from the default set for instance. – Stéphane Chazelas Aug 17 '21 at 08:42
To set the X selections from within scripts, you may want to have a look at commands such as xclip or xsel instead. See also pbcopy/pbpaste on macos to manipulate the macos clipboard. See Copy the contents of a file into the clipboard without displaying its contents – Stéphane Chazelas Aug 17 '21 at 08:52
1

Seems like WindowOps can be partially enabled. See here. If this works then it's probably best practice. – cyqsimon Aug 04 '22 at 13:43

xterm does not support osc 52

1 Answers1