Telnet not connecting as should

[eugenov]

Version: 1.0.145 Platform: win32 10.0.19043 Plugins: save-output

Hello! After connecting with telnet profile i see some garbage symbols, but Tabby says session is connected.

 Telnet  Connecting to [host]
 Telnet  Connected
���� ��#��'��$
> 

Tried various telnet i/o options - no luck.

[Eugeny]

This looks like the actual output from the host. What kind of protocol are you expecting? You can also enable hexdump mode to see exactly what's being received

[eugenov]

This is output of telnet session from linux host:

[root@host-01 ~]# telnet [someIP]
Trying [someIP]...
Connected to [someIP].
Escape character is '^]'.
Login:

And this is from tabby, telnet profile

 Telnet  Connecting to [someIP]
 Telnet  Connected

  ���� ��#��'��$
>

[eugenov]

After 147alpha, i see

 Telnet  Connecting to [someIP]
 Telnet  Connected

> 

no garbage symbols, but still no real connection

[Eugeny]

Thanks for testing. Could you please post the Devtools console log, or even better, a Wireshark dump of the session?

[eugenov]

Devtools console output

entry.ts:56 Window bootstrap data: Object
plugins.ts:131 Found community-color-schemes in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found core in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found electron in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found local in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found plugin-manager in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found serial in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found settings in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found ssh in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found telnet in C:\apps\tabby\resources\builtin-plugins
plugins.ts:131 Found terminal in C:\apps\tabby\resources\builtin-plugins
2plugins.ts:131 Found save-output in C:\apps\tabby\data\plugins\node_modules
plugins.ts:139 Plugin terminus-save-output already exists, skipping
entry.ts:67 Starting with plugins: Array(11)
plugins.ts:177 Loading terminal: C:\apps\tabby\resources\builtin-plugins\tabby-terminal\dist\index.js
plugins.ts:177 Loading telnet: C:\apps\tabby\resources\builtin-plugins\tabby-telnet\dist\index.js
plugins.ts:177 Loading ssh: C:\apps\tabby\resources\builtin-plugins\tabby-ssh\dist\index.js
plugins.ts:177 Loading settings: C:\apps\tabby\resources\builtin-plugins\tabby-settings\dist\index.js
plugins.ts:177 Loading serial: C:\apps\tabby\resources\builtin-plugins\tabby-serial\dist\index.js
plugins.ts:177 Loading plugin-manager: C:\apps\tabby\resources\builtin-plugins\tabby-plugin-manager\dist\index.js
plugins.ts:177 Loading local: C:\apps\tabby\resources\builtin-plugins\tabby-local\dist\index.js
plugins.ts:177 Loading electron: C:\apps\tabby\resources\builtin-plugins\tabby-electron\dist\index.js
plugins.ts:177 Loading core: C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js
plugins.ts:177 Loading community-color-schemes: C:\apps\tabby\resources\builtin-plugins\tabby-community-color-schemes\dist\index.js
plugins.ts:177 Loading save-output: C:\apps\tabby\data\plugins\node_modules\tabby-save-output\dist\index.js
C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js:17808 [main] v 1.0.147
C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js:17808 [updater] Error: Can not find Squirrel
    at AutoUpdater.method [as checkForUpdates] (electron/js2c/browser_init.js:17:1405)
    at handler (C:\apps\tabby\resources\app.asar\dist\webpack:\tabby\node_modules\@electron\remote\dist\src\main\server.js:454:64)
    at IpcMainImpl.<anonymous> (C:\apps\tabby\resources\app.asar\dist\webpack:\tabby\node_modules\@electron\remote\dist\src\main\server.js:313:27)
    at IpcMainImpl.emit (events.js:315:20)
    at IpcMainImpl.EventEmitter.emit (domain.js:467:12)
    at Object.<anonymous> (electron/js2c/browser_init.js:161:10099)
    at Object.emit (events.js:315:20)
    at Object.apply [as emit] (domain.js:467:12)
    at Object.n.emit (C:\apps\tabby\resources\app.asar\dist\webpack:\tabby\node_modules\@sentry\electron\dist\main\integrations\electron.js:63:25)
doLog @ C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js:17808
C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js:17808 [hostApp] CLI arguments received: Object
5DevTools failed to load source map: Could not parse content for file:///C:/apps/tabby/app.asar.unpacked/assets/webpack/index.js.map: Unexpected end of JSON input
DevTools failed to load source map: Could not parse content for file:///C:/apps/tabby/resources/app.asar/dist/index.js.map: Unexpected end of JSON input
5DevTools failed to load source map: Could not parse content for file:///C:/apps/tabby/app.asar.unpacked/assets/webpack/index.js.map: Unexpected end of JSON input
DevTools failed to load source map: Could not parse content for file:///C:/apps/tabby/resources/app.asar/dist/index.js.map: Unexpected end of JSON input
index.html:1 Autofocus processing was blocked because a document already has a focused element.
C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js:17808 [telnet-10.1.154.254-23] Connecting to 10.1.154.254
C:\apps\tabby\resources\builtin-plugins\tabby-core\dist\index.js:17808 [telnet-10.1.154.254-23] Connected

[Eugeny]

Thanks. Could you please also make a Wireshark dump of the connection?

[eugenov]

Heh, could someone accept that telnet works fine? Then I will dig this issue inside my system. Wireshark logs are on the way...

[eugenov]

Ehm, maybe you could hint me what I have to sniff exactly with Wireshark? I have no experience with it at all... There is large output, I can't understand what to send here.

[Eugeny]

Select all interfaces for capture and then use a filter like "tcp.port == 23" (or your telnet port).

On Fri, 23 Jul 2021, 22:20 eugenov, @.***> wrote:

Ehm, maybe you could hint me what I have to sniff exactly with Wireshark? I have no experience with it at all...

— You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub https://github.com/Eugeny/tabby/issues/4164#issuecomment-885893328, or unsubscribe https://github.com/notifications/unsubscribe-auth/AABHNRDXPXNGR6MQTHIFNFTTZHFIRANCNFSM5AAE5TGA .

[eugenov]

Is that the data that you did require? I also have pcapng binary result, if you need it...

[Eugeny]

This doesn't include the actual data unfortunately. Use "File > Save as" to save a full capture.

[eugenov]

telnet.pcapng.txt

[Eugeny]

Could you please test this nightly build? https://github.com/Eugeny/tabby/actions/runs/1133406367

GitHub

telnet: added potentially missing WILL responses · Eugeny/tabby@3584af5

A terminal for a more modern age (formerly Terminus) - telnet: added potentially missing WILL responses · Eugeny/tabby@3584af5

[eugenov]

I'm sorry, everything is the same:

 Telnet  Connecting to 10.1.154.254
 Telnet  Connected

>

while from linux host:

# telnet 10.1.154.254
Trying 10.1.154.254...
Connected to 10.1.154.254.
Escape character is '^]'.
Login:

[Eugeny]

Thanks, could you please also post me a new packet capture? If you could also capture one from the linux client, that would be perfect.

[eugenov]

wireshark_telnet_v2.zip Sorry for delay, fresh capture in attachment.

[Eugeny]

Thanks - please test this build when you have time: https://github.com/Eugeny/tabby/actions/runs/1243407347

GitHub

don't copy text if empty · Eugeny/tabby@8d3f413

A terminal for a more modern age (formerly Terminus) - don't copy text if empty · Eugeny/tabby@8d3f413

[eugenov]

Bingo! Now i see

  Telnet  Connecting to 10.1.154.254
 Telnet  Connected
Login: 
> 

This is something. I can login, insert password and such. Just need to get rid of this new line and ">" symbol, as it breaks input in number of cases.

[Eugeny]

Great! You can disable it by setting the Input mode to "normal" in the profile settings:

[eugenov]

Yes, telnet now works perfectly! Thank you!