On 11.04.2018 17:31, Andreas Schneider wrote: > On Wednesday, 11 April 2018 16:27:16 CEST g4-l...@tonarchiv.ch wrote: >> Hello all >> >> I realized that SSH servers with the keep-alive option enabled first >> send the keep-alive _global_ request as long as nothing had connected to >> the local TCP socket: >> >> $> ssh -v -N xxx@yyy -L 8088:testcom.com:80 >> >> debug1: client_input_global_request: rtype keepal...@openssh.com >> want_reply 1 >> >> After connecting to localhost:8088, these requests are sent over the >> channel: >> >> debug1: client_input_channel_req: channel 2 rtype >> keepal...@openssh.com reply 1 >> >> From this I conclude that the channel should not be opened before there >> is a waiting connection on the local TCP socket. >> But how do I tell libssh to work on the global request as long as there >> is no open channel? >> >> Maybe I have to use ssh_get_fd() and the use select() also on this >> socket while waiting for the local incoming connections? And then use >> ssh_set_fd_toread()? >> >> I would appreciate a lot if someone could show me some sample code. > I think that ssh_event_dopoll() will handle it and call the appropriate > callback. Don't use ssh_select() > > In master we have the new connector API which is easier to use, see > https://git.libssh.org/projects/libssh.git/tree/examples/ssh_client.c > Thanks, I think that's the issue: The main event polling is not called why my code waits for a connection. But how do I get the event to which are attached the default handlers of libssh?
I also looked at the sample code which uses the event API for polling on the channel. But this would not solve my issue with global keep-alive requests. They are sent while no channel exists. IMHO it's an issue with handling messages in the main loop while no channels are open. Best regards, Till
