Are you sure it returns 0 and not an error? And why such small writes if you are doing file transfers? Bigger writes makes better use of ssh framing and compression.
----- Ursprungsmeddelande ----- > Hello, > > I am trying to implement my own file transfer protocol and encountered a > problem when client or server is connected via libssh2 (the protocol > works flawlessly on "normal" network). > > I am writing small amounts of data (not more than 4096 bytes) to ssh > channel, using libssh2_channel_write_ex. Up to 2Mb sent, the function > returns actual bytes written. But around 2Mb (the boundary is not > constant, but it fails around 2093051, 2080764, 2083684 or 2092906) it > begins returning 0 and of course - no data reaches destination. > > If I transfer a file that is a bit smaller than 2Mb - it goes through, > the channel gets OK response and I can send another less than 2Mb file > (it seems that reading my protocol's "OK" message from ssh channel > somehow unclogs it...) > > I googled around for "libssh2" and "2097152" finding several posts > describing, I guess, similar problem. > > This may be also connected with windows RDP protocol forwarded via > libssh2_channel_forward_listen_ex problem. I can connect to forwarded > channel and log in, but as soon as I log in and a huge amount of data > (current remote screen) is to be written to libssh channel, the > connection hangs - surely there's more than 2Mb of data written to the > channel... > > Is this a bug, a feature or am I just doing something wrong? > > Regards, > > Przemek. _______________________________________________ libssh2-devel http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel
