#! /bin/sh
#

if [ "$#" -eq 0 ] || [ "$#" -gt 1 ]; then
  echo takes only one argument
  exit 1
fi

if [ ! -e "${1}" ]; then
  echo cannot find "${1}"
  exit 1
fi

# shellcheck source=./env_files/ssh-tunnel-example.env
. "${1}"

ssh \
  -v \
  -N \
  -L \
  "${local_ip}:${local_port}:${local_ip_on_remote}:${local_port_on_remote}" \
  "${remote_host}"