It's hacked version of dtach made for chromeos to overcome restricted sudo
+/*
+ dtach - A simple program that emulates the detach feature of screen.
+ Copyright (C) 2004-2016 Ned T. Crigler
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
The goal is to run listener in priveledged environment and use fifo to spawn detached shell and then use it as a replacement for restricted crosh shell.
Usage: ./plugctl listen <fifo>|create <socket> <cmd> <args>|connect <socket>
To spawn a command in listener environment:
echo -e -n "cmd\0socket\0" > fifo # without arguments
cut -c1 fifo > /dev/null
./plugctl connect <socket>
run listener on vt2 or as upstart task...