sshtunnel

#!/usr/bin/env bash

#load the config
CONFIG=/etc/myconfig/tunnel.conf
if [ -f "$CONFIG" ]; then
source "$CONFIG"
else
echo "=> ERROR: no config found @ $CONFIG"
exit 1
fi



# supervisord should be able to send a SIGINT to stop this services/daemon
trap finish TERM
finish(){
  #kill $ACTUAL_PID $JOB
  kill  $JOB
  echo "=> recieved SIGINT and exited OK"
  exit 0
}


echo "=> Tunneling localhost:${TUNNEL_PORT_LOCAL} to ${REMOTE_USER}@${REMOTE_HOST}:${REMOTE_PORT} (on port ${TUNNEL_PORT_REMOTE}) using key ${KEY}"
autossh \
  -M 0 \
  -o "ServerAliveInterval 20" -o "ServerAliveCountMax 3" -o "StrictHostKeyChecking=no" \
  -NR ${TUNNEL_PORT_REMOTE}:127.0.0.1:${TUNNEL_PORT_LOCAL} \
  -i "${KEY}" \
   ${REMOTE_USER}@${REMOTE_HOST} &

# record the JOB (should be backgrounded)
JOB="$(jobs -p)"

# give it a few seconds to settle
sleep 3
ACTUAL_PID="$(pgrep -P $JOB)"

while true ; do
  if ! kill -0 "$JOB" 2>/dev/null ; then
    echo "=> ERR $$ ssh: $JOB not running"
    exit 1
#  else
#    echo "=> $$ job: $JOB running"
  fi

  if ! kill -0 "$ACTUAL_PID" 2>/dev/null ; then
    echo "=> ERR $$ autossh: running but its child died"
    kill $JOB
    exit 1
  fi
#  echo actual pid = $ACTUAL_PID
  sleep 1
done

exit 0
echo "=> Exiting"