Internal buffers

[Michal Vaško <mvasko@xxxxxxxxx>]

Hello,
we encountered what it seems a rare bug. We tried to send an SSH message of length more than 200kB and most of the time the other end read it correctly, but the message directly following (of length 4B) was lost somewhere. The strange thing is that it did not happen every single time and never when communicating using localhost.

I tried to debug it myself, but I failed to find the problem. Even when testing it with libssh verbosity 3, all the writes and reads just confirmed this, it was successfully written, but failed to be read. Also, if I divided the big message into at least 2 separate writes, it solved the problem. Did anyone encounter it? Anyone should be able to reproduce it because out software is open-source, link to the github issue [1]. Thank you for any assistance.

Kind regards,
Michal vasko

[1] https://github.com/CESNET/Netopeer2/issues/14