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SSH Exec output truncated [message #54445]

Tue, 21 July 2020 13:30

jstip
Messages: 4
Registered: July 2020

Junior Member

I am using SshSession CreateExec to run a command on a remote machine, and capture the output.
I noticed that long outputs are truncated. If I increase CHUNKSIZE in Core/SSH/Core.h, I can get the full output.
Is this the way to do this, or is there another way to get the full output?

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Re: SSH Exec output truncated [message #54447 is a reply to message #54445]

Tue, 21 July 2020 20:41

Oblivion
Messages: 1143
Registered: August 2007

Senior Contributor

Hello jstip,

And welcome to U++ forums.

I noticed that long outputs are truncated. If I increase CHUNKSIZE in Core/SSH/Core.h, I can get the full output.

It should be fixed now.
Hopefully the fix will be available in the nightly builds, shortly after the midnight (The change is already reflected in the U++ git mirror though.)
Please check.

Long story short: Your observation is correct. It was "stubbed" that way for the time being (Its base class, SshChannel, is going to be refactored. But I am waiting the next stable point release of libssh2 1.9, where I will upgrade the library too.)

Now it is fixed. Just pass the string and don't worry about the chunk size.

P.s: There is already a ChunkSize method for every class derived from SshChannel, including SshExec. You don't need to modify the code if you want to adjust the chunksize.

If you encounter any errors or have questions let me know.

Best regards,
Oblivion.

Github page: https://github.com/ismail-yilmaz
upp-components: https://github.com/ismail-yilmaz/upp-components
Bobcat the terminal emulator: https://github.com/ismail-yilmaz/Bobcat

[Updated on: Tue, 21 July 2020 21:31]

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Re: SSH Exec output truncated [message #54448 is a reply to message #54447]

Wed, 22 July 2020 09:43

jstip
Messages: 4
Registered: July 2020

Junior Member

Hi Oblivion,

That's fast Smile

I understand you want to wait for libssh2, you don't want to do double work. But it seems to be working now with the nightly build.
And indeed, I see the ChunkSize method in the SshChannel class, missed that one.
Thanks a lot!

Regards, Jan

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Re: SSH Exec output truncated [message #54449 is a reply to message #54448]

Wed, 22 July 2020 10:27

Oblivion
Messages: 1143
Registered: August 2007

Senior Contributor

Hello Jan,

Quote:

And indeed, I see the ChunkSize method in the SshChannel class, missed that one.

About the chunk size: Keep in mind that it simply represents the maximum chunk size of data that can be transfered in one loop cycle.
Increasing the chunk size "can" (not necessarily) improve the transfer speed and responsiveness (this is especially visible on SShShell sessions or SCP transters). But usually the 64K default value is OK.

Best regards,
Oblivion

Github page: https://github.com/ismail-yilmaz
upp-components: https://github.com/ismail-yilmaz/upp-components
Bobcat the terminal emulator: https://github.com/ismail-yilmaz/Bobcat

[Updated on: Wed, 22 July 2020 12:49]

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