App::BCSSH - Back channel SSH messaging


    client$ bcssh ssh host
    host$ bcssh vi file

    # bashrc
    alias ssh=bcssh ssh
    bcssh ping && alias vi=bcssh vi

    # help
    bcssh commands
    bcssh help ssh


This is a beta release and there is no guarantee the API will not change.


This module enables commands on run on a server to be forwarded back to the client that established the SSH connection. Specifically, it is meant to enable opening files in a local editor via commands run on the server.

This is same concept that bcvi uses, but using a different messaging protocol to fix some issues with it's design.

bcvi uses remote port forwards to enable communicating with the local machine. These may not be enabled on the server. It also overloads the TERM environment variable to pass information to the server, but this is problematic if the server doesn't have bcvi set up on it to fix TERM.

SSH already provides a mechanism for the server to communicate with the client machine in the form of ssh agent forwarding. bcssh abuses this protocol to allow passing custom messages. It sets itself up as a proxy for the messages, passing through most messages. It can identify messages intended for BCSSH though, and use this to pass arbitrary information back and forth to the server. This also allows the server to probe the agent for BCSSH support, removing the need to overload TERM.


This is all probably a terrible idea.


App::BCVI - The inspiration for this concept


haarg - Graham Knop (cpan:HAARG) <>


None yet.


Copyright (c) 2013 the App::BCSSH "AUTHOR" and "CONTRIBUTORS" as listed above.


This library is free software and may be distributed under the same terms as perl itself.