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Thank you for the tips. I configured the client socket to non blocking and now I can use wolfSSH_stream_read() in order to trigger the window adjustment processing.
Another problem, which I could figure out today:
Putty sends in it's window adjust message a string called "winadj@putty.projects.tartarus.org" (see https://tartarus.org/~simon/putty-snaps … ndixF.html). This string is 34 characters long but the variable, where it is copied (call of GetString() in DoChannelRequest()) has a length of 32 characters. This leads to an invalidation of the next variables on the stack. An increment of the string variable size would solve the problem.
That is right. The server calls wolfSSH_stram_send() many times in order to send a huge amount of data, but without calling wolfSSH_stream_read() in between. But the fact is, that when it calls wolfSSH_stream_read() between all these send calls, it expects some data from the client. When the client is not sending any data except the window adjustment message, wolfSSH_stream_read() does not return and any following operation is blocked.
So what do you suggest to do in this case?
Hi John,
I have sent you an e-mail.
Best, Marco
Hi,
in the current example code of the SSH echoserver, connections are closed by calling close(clientFd)
This seems not to be a clean connection close, because Putty returns with the message
Fatal Error
Server unexprectedly closed network connection
Would it be possible to get an API function like for example wolfSSH_close, wich calls the internal function SendChannelClose in order to close the connection in a clean way?
Thanks,
Marco
Right, I am using the latest Github code.
Hey John,
I am using OpenSSH client (1:7.2p2-4ubuntu2.1) on Linux and PuTTY (0.67) on Windows. Both clients show the same behavior.
Best,
Marco
Hi,
I currently implemented a SSH server based on the current wolfSSH v1.0.0 from github, orienting on the example echoserver, that is included.
When I am trying to send a huge amount of data to the client, calling wolfSSH_stream_send, it stops sending data after a specific amount. I found out, that the peer window size (channel->peerWindowSz) gets decreased with every call of wolfSSH_stream_send, but never gets increased anymore. When the value of channel->peerWindowSz reachess zero, the call of wolfSSH_stream_send does not send any data and returns with "0".
So how should the software behave in this case? Is there maybe a possibility to do a window adjustment in order to send all data?
Thanks,
Marco
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