Network Virtual Terminal

Hello,

here my implementation of Network Virtual terminals (NVT tty)
according to RFC 854 and RFC 2217... actually this is the client side
part since as remote server I used sredird
(http://freshmeat.net/projects/sredird/).

I tested the code under the following configuration:

        ------------------+
             +---------+  |
             | minicom |  |
             +---------+  |
                  |       | local PC with no
                  v       | serial ports
             /dev/nvtty0  |
                  |       |
        ------------------+
                  |
                  v
             /\/\/\/\/\
            | network |
             \/\/\/\/\/
                  |
        ------------------+
                  |       |
                  v       |
             +---------+  |
             | sredird |  |
             +---------+  | remote PC with
                  |       | serial ports
                  v       |
             /dev/ttyS0   |
                  |       |
	------------------+
                  |
                  v
         embedded PC with
         a serial console

however it could work on a different schema I suppose.

By using minicom I can setup the serial settings of the /dev/ttyS0
device through the /dev/nvtty0 virtual device, then the communication
with the embedded PC can start as if it was directly connected with my
local machine.

Ciao,

Rodolfo