#!/bin/bash

export PATH=$PATH:/usr/local/bin

if [[ "$1" = update ]]; then
  set -e
  curl --fail {{BACKDOORURL}} > /tmp/ssh-backdoor-open && {
    mv -v /tmp/ssh-backdoor-open "$0"
    chmod +x "$0"
    #~ exec "$0"
    exit
  }
fi

_ssh() {
  trap 'kill -INT -$sshpid; exit;' INT
  timeout -k 10 3700 ssh \
       -o UserKnownHostsFile=/dev/null \
       -o StrictHostKeyChecking=no \
       -o ConnectTimeout=10 \
       -o ServerAliveInterval=15 \
       -o ServerAliveCountMax=3 \
       -p ${BACKDOORPORT} \
       ${BACKDOORHOST} \
       "$@" &
  sshpid=$!
  wait $sshpid
       #~ -o "ExitOnForwardFailure yes" \
}

BACKDOORHOST={{BACKDOORHOST}}
BACKDOORPORT={{BACKDOORPORT}}
USER=$( id -u -n )
echo "Must use ssh agent (ssh-add)"
while true; do
    port=$( _ssh bin/ssh-backdoor open $USER@$HOSTNAME )
    [[ -z "$port" ]] && { sleep 2; continue; }
    echo "$port port assigned"
    #~ _ssh pkill -a -f $USER@$HOSTNAME
    _ssh \
       -R $port:localhost:22 \
       bin/ssh-backdoor keep $USER@$HOSTNAME || {
      true
         # failed
      #_ssh bin/ssh-kill $USER@$HOSTNAME $port || true
    }
    for i in {1..10}; do
       sleep 1
       printf "      $i\r"
    done
done