A terminal utility that allows to pipe remote session output to local resources.
This code based on: http://rachid.koucha.free.fr/tech_corner/pty_pdip.html - examples for psuedo terminals.

Compile with:  gcc -o dp dp.c 

Example:

 $./dp /bin/bash
 ssh myuser@router1
 Password: ********
 ROUTER1>sh tacacs||grep -i server
 Tacacs+ Server -  public  :
            Server address: 192.168.0.99
               Server port: 49
Tacacs+ Server -  public  :
            Server address: 192.168.0.100
               Server port: 49

        
ROUTER1>exit
$exit

The program spawns a psuedo terminal and parses the input sent from the user looking for a "double pipe". If a double pipe is encountered the program splits the command at the double pipe and only sends the first command while saving the second command in a buffer. When the output of the first command is returned from the remote session, the program opens a local pipe to send the returned output to the previously saved buffer command.

In the example above the command "show tacacs||grep -i server", the parser splits the input into two parts:

array[0] = "show tacacs"
array[1] = "grep -i server"

The first command "show tacacs" is sent to the far end and the output of that command is piped locally to "grep -i server".

This code is BETA release currently and needs to implement password hiding as well as more testing.

Tested on Ubuntu, Windows WSL Ubuntu 16.4, Windows 10/Cygwin64, Redhat 7.x, Linux Mint.

Need to work on the following:

• Psuedo terminal shows password.
• The terminal needs to interpret escape and control sequences.
• The program currently writes to local files to pass data from the parent process to the child. Need to implement shared memory.
• The parser needs its own object IE: typedef struct parser { .... }
• Checks for failure to open files.
• research as this could be re-developed using a legitimate terminal library versus the pseudo terminal since the PIPE code can be ported easily.