sshd server keeps count of characters typed on a line and will not send
backspace erase to the client if no character is there to erase on the
line even if the users is typing backspaces. This avoids erase of shell
prompt characters for visual user friendliness.
Problem was error data received were shown after output data. But order
should be kept to how it is received from the sshd server. Now we show
error and output data in the way we received from the sshd sever. Thus
typing "di" in place of "dir" in cmd shell will show the error message
correctly before the next shell prompt comes through.
Console API is now used for interactive tty mode. Thus ssh.exe client
can now pass each character to remote side as one types so that programs
like more works correctly. Control-c now will stop the remote program
instead of exiting the ssh.exe.
Fixes issues like cmd.exe shell not handling backspace, control-c.
Control-c is still a work in progress and will be fixed but backspace
processing works. This work when complete will make cmd.exe shell and
powershell work better for interactive users.
Pty mode code added so that sshd server can do remote echo, backspace
processing. etc and ssh.exe client does not have to do local echo. We
can enrich it in future for more features and allowing programs like
powershell to run interactive. Pty mode is central for interactive use
and will be built using Windows console instead of termios that
Linux/Unix uses.
Whether LF should be changed to CR-LF is determined by what the remote
sshd server wants. Sequences like ESC[20h is sent by sshd servers in pty
ANSI mode. Unix servers usually want LF and Windows servers CR-LF. Added
simple ANSI data check now for pty use in interactive mode. Need to
expand to simple ANSI engine in future for processing other ANSI
terminal attributes.
quamrulmina
arif-pragmasys