openssh unix dev - Apr 2004 - openssh code

Hi,
    How do the communication between sshd and program happens when compat20
is enabled? There are two function process_buffered_input_packets and
process_input, but in both cases if compat20 is enabled its just buffering
the packets, but how do sshd will the command to program for execution?

Regards
prasad

prasadnn wrote:
> Hi,
>     How do the communication between sshd and program happens when compat20
> is enabled? There are two function process_buffered_input_packets and
> process_input,
process_input takes input from the network and queues it using
packet_process_incoming().

For SSH protocol 1, it also reads the stderr and stdout data - SSH1 only
allows a single shell/program/subsys session, whereas SSH2 allows
multiple.

For SSH protocol 2, data to/from the client is handled through the
channels code. E.g. channel_after_select() -> channel_handler ->
channel_handle_rfd, this same mechanism is used to write data to/from
the session (and port forwardings).

process_buffered_input_packets just processes any packets from the
network that have been queued.

-d