pressing Win+Z in Konsole dumps contents of /etc/hosts?

[KPF]

1. start Konsole
2. press Win+Z
3. have /etc/hosts dumped to screen
4. have 'sz' entered in command line

For example

[dmpogo]

Same here, indeed, though it is not literally /etc/hosts in my case.

It gives only

::1 grizzly localhost

(grizzly is my machine), not IPV4 assignments, and there is no literally this line /etc/hosts. What I have there is

::1 localhost

So it looks like it dumps some network information

[Banana]

Any change or missconfig in keyboard shortcuts? Or maybe a reset of them could help?
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[dmpogo]

[42n4]

Meta+n (Win+n) gives the same result, but with sn on the command line.
I also tried to find Alt-o in konsole (interacts with mc), but failed.
In ~/.config/khotkeysrc I have found many strange shortcuts and ~/.config/kwinrc contains strange stuff, too.
But Win+n, Win+z, Alt+o remained not found.
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[Goverp]

I too get a network printout for Win+Z, or rather:

[Ralphred]

In Konsole, I get the network info printed on Win+{z,x,c,v,*}, but the line has to be blank, if you leave the "sz" after the first combo, nothing else works. It seems to be the default behaviour for an unbound Win+[something] combo.

The network info is *from* /etc/hosts, but is seems to be some kind of ad-hoc workaround for missing ipv6 entries (my /etc/hosts has some temp ipv4 stuff in there from a set-up I built for a friend, 'cos I couldn't be bothered to make a zone file for in BIND) - it seems to be redirecting known ipv4 hosts without an ipv6 entry to ::1...

[Zarhan]

This seems to be limited *only* to Konsole.

xev doesn't register anything special either.

[steve_v]

Apparently this is coming from the "ssh plugin", but I'll be dammned if I can find any documentation or configuration for it.
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[Chiitoo]

I have no idea what the references "ssh plugin" might be, but I have noticed this host print thing happen with QTerminal as well.
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[Ralphred]

[dmpogo]

BTW, regarding that repot, which says it dumps host mapped to 127.0.0.1. On my machine it is not, it dumps all hosts defined in /etc/hosts, + ::1 symbol.
On my other machine, Win-Z gives

[Hu]

This sounds like the readline binding for complete-hostname or perhaps possible-hostname-completions is being triggered. The stated default values for those bindings are not consistent with the key sequences reported here, but there is no guarantee that the reported key (Win+Z etc.) is not generating a sequence of keys that contain the triggering key sequence.

For someone who sees this happen, what do you get if you run xxd, then type the key sequence, and an EOF? That will tell us what characters the terminal is sending to the contained program.

[KPF]

Aha!
yes, it looks like completion for host names.

Pressing Win+Z after typing 'lo' gives 'localhost' only, from all entries before.

Similarly for other entries.

[Goverp]

Hmm. I noticed I'd accumulated a couple of non-default konsole profiles for no reason I could remember, so I deleted them and made the Built-in profile default. Now Win+W gives the "select a Window" display (zoom out and display the running application windows). No hint of any networking stuff ... I'm disappointed, I was enjoying exploring this rabbit hole!
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Greybeard

[KPF]

I switched the Konsole profile to Default, still the same network info is printed. Not at Win+W, but Win+Z and Win+n...

Moreover, Konsole with SSH opened to another machine, prints the network info from that machine.

Some kernel mumbo-jumbo, it seems.

This behaviour is not new, it was there in Plasma 5, at least year ago, I just was lazy to ask...

But I mean, I would not want to have discovered some many-years old worm like recent xz backdoor. Reacting to invisible keypresses from another worm.

[Hu]

KPF: I asked above for information that might let us understand it. Are you able to collect that? Why do you think this is a kernel problem?

[steve_v]

[KPF]

Hu: sorry, I don't have xxd installed, but there are two in portage, which is right? (dev-util/xxd or dev-util/xxdi - emerging both, I will install and try them. Though never used xxd so collecting the requested information will need some time.

About kernel problem, it was simply my panic lack of information. sorry if it sounded rude...

[rab0171610]

[Hu]

Yes, Ctrl+D is the traditional way to generate EOF.

For tools, hexdump or od -tx would also work, but this is fine. That confirms the problem. When you type this key sequence, the terminal sends to the contained program the four characters: ^X (control X), an at sign, 's', and 'z'. The first two of those are the readline default for possible-hostname-completions:

[KPF]

So this is the bash command, now I understand!

UPD: I probably found the cause (from this question from Feb 2021 to the explanation)

[rab0171610]

How very curious. I learn something new every day. Thank you for solving the mystery!