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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 $OPTARG\n" >&2
            exit 1
            ;;
        :)
            printf "Option -$OPTARG requires an argument\n" >&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>\n"
    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\n" >&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
start-stop-daemon \
    --start \
    --quiet \
    --pidfile "$AUTOSSH_PIDFILE" \
    --exec "$(type -p autossh)" \
    -- "$@"