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#!/bin/bash
#
# Simple $AUTOSSH and terminal multiplexer wrapper.
#
# Parameters
#
# We're enforcing a random monitoring por for autossh
# as some systems might deny reading /proc/net/tcp like
# kernels with grsecurity patch.
BASENAME="`basename $0`"
DEST="$1"
COMMAND="$2"
#LOCAL_MULTIPLEXER="wscreen"
LOCAL_MULTIPLEXER="wtmux"
MONITORING="-M $(($RANDOM + 1024))"
AUTOSSH="autossh $MONITORING"
# Set window title
# http://stackoverflow.com/questions/899609/gnu-screen-run-script-that-sends-commands-to-the-screen-session-it-is-being-run
function window_title {
if [ -n "$STY" ]; then
screen -p $WINDOW -X title "$*"
elif [ -n "$TMUX" ]; then
tmux rename-window "$*"
else
if which xtitle &> /dev/null; then
xtitle "$*"
fi
fi
}
# Check if a named session exists, screen version
function shell_wscreen_ls {
screen -ls $1 | grep -q "There is a screen on"
}
# Check if a named session exists, tmux version
function shell_wtmux_ls {
tmux ls 2> /dev/null | grep -q ^$1:
}
# Try tmux, then screen
function shell_remote_multiplexer {
tmux="tmux attach"
if [ ! -z "$1" ]; then
tmux="$tmux -t $1"
fi
echo "$SUDO $tmux || $SUDO screen -x $1"
}
# Syntax check
if [ -z "$DEST" ]; then
exit 1
fi
# Set default screen title
window_title $DEST
# Dispatcher
if [ "$BASENAME" == "shells" ]; then
# Remote screen shell using $AUTOSSH
if [ "$COMMAND" == "root" ]; then
SUDO="sudo"
$AUTOSSH $DEST -t -- "`shell_remote_multiplexer`"
else
$AUTOSSH $DEST -t -- "`shell_remote_multiplexer` $COMMAND"
fi
else
if [ -z "$COMMAND" ] && shell_${LOCAL_MULTIPLEXER}_ls $DEST; then
# Local existing screen shell
$LOCAL_MULTIPLEXER $DEST
elif [ -z "$COMMAND" ] && [ "$DEST" == "root" ]; then
# Local root shell
window_title root
SUDO="sudo"
eval `shell_remote_multiplexer`
elif [ -z "$COMMAND" ] && ( [ -f "$HOME/.screen/$DEST" ] || [ -f "$HOME/.tmux/$DEST" ] ); then
# Local root shell
window_title $DEST
shell local $DEST
elif [ "$DEST" == "local" ]; then
# Local screen shell
window_title $COMMAND
$LOCAL_MULTIPLEXER $COMMAND
else
# Remote shell using $AUTOSSH
$AUTOSSH $DEST -t -- $COMMAND
fi
fi
# Restore screen title
window_title terminal
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