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#!/usr/bin/env bash
#
# Wrapper around autossh and start-stop-daemon for basic persistence. Intended
# to be called as a script from profile.d for automatic SSH tunnels.
#
# Takes one required option -p, the autossh monitoring port number to use. Cut
# the options off with -- and the remainder of the arguments are passed to the
# autossh binary.
#
# $ psshd -p 9001 -- -fN -D 8001 remotehost
#
# @author Tom Ryder <tom@sanctum.geek.nz>
# @copyright 2013
#
# Path to autossh binary (not any wrapper script)
autossh='/usr/lib/autossh/autossh'
# Path to start-stop-daemon binary
startstopdaemon='/sbin/start-stop-daemon'
# Neither of those are likely to be in your PATH if you're a normal user, so we
# hardcode the paths and test for their existence
if [[ ! -x "$autossh" ]]; then
printf "Can't execute ${autossh}!" >&2
exit 1
elif [[ ! -x "$startstopdaemon" ]]; then
printf "Can't execute ${startstopdaemon}!" >&2
exit 1
fi
# Get port in options
while getopts ':p:' opt
do
case "$opt" in
p)
port="$OPTARG"
;;
\?)
printf "Invalid option $OPTARG" >&2
exit 1
;;
:)
printf "Option -$OPTARG requires an argument" >&2
exit 1
;;
esac
done
shift "$((OPTIND-1))"
# If no port, give up with usage instructions
if [[ ! -n "$port" ]]
then
printf "USAGE: $0 -p <port number> -- <ssh arguments>"
exit 1
fi
# Set up a PID dir
dir="${TMPDIR:-/tmp}/psshd-${UID}"
if ! mkdir -p "$dir"; then
printf "Couldn't create directory ${dir} for PID file" >&2
exit 1
fi
# Export the two settings autossh absolutely needs
AUTOSSH_PIDFILE="${dir}/psshd-port-${port}.pid"
AUTOSSH_PORT="$port"
export AUTOSSH_PIDFILE AUTOSSH_PORT
# Use start-stop-daemon to run it sanely
"$startstopdaemon" \
--start \
--quiet \
--pidfile "$AUTOSSH_PIDFILE" \
--exec "$autossh" \
-- "$@"
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