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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
#
# Name self
self=psshd
# Extend path to find autossh and start-stop-daemon binaries
PATH=/usr/lib/autossh/autossh:/sbin:$PATH
# Check we have access to the required binaries
cmds=(autossh start-stop-daemon)
for cmd in "${cmds[@]}"; do
if ! type -p "$cmd" >/dev/null; then
printf '%s - Could not find %s in PATH\n' "$self" "$cmd" >&2
exit 127
fi
done
# Get port in options
while getopts ':p:' opt; do
case $opt in
p)
port=$OPTARG
;;
\?)
printf 'Invalid option %s\n' "$OPTARG" >&2
exit 1
;;
:)
printf 'Option -%s requires an argument\n' "$OPTARG" >&2
exit 1
;;
esac
done
shift $((OPTIND-1))
# If no port, give up with usage instructions
if ! [[ "$port" ]]; then
printf 'USAGE: %s -p <port number> -- <ssh arguments>\n' "$self"
exit 1
fi
# Set up a PID dir
rundir=${TMPDIR:-/tmp}/psshd-$UID
if ! mkdir -p "$rundir"; then
printf 'Could not create directory %s for PID file\n' "$rundir" >&2
exit 1
fi
# Export the two settings autossh absolutely needs
AUTOSSH_PIDFILE=$rundir/psshd-port-${port}.pid
AUTOSSH_PORT=$port
export AUTOSSH_PIDFILE AUTOSSH_PORT
# Use start-stop-daemon to run it sanely
start-stop-daemon \
--start \
--quiet \
--pidfile "$AUTOSSH_PIDFILE" \
--exec "$(type -p autossh)" \
-- "$@"
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