Open external Ports with UPNPC

#!/bin/bash
######################################################################
#Copyright (C) 2023  Kris Occhipinti
#https://filmsbykris.com

#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation version 3 of the License.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.
######################################################################

which upnpc >/dev/null || sudo apt install miniupnpc

function getinput(){
  read -p "Internal Port: " in_port
  [[ $in_port ]] || exit

  read -p "Extertnal Port: " ext_port
  [[ $ext_port ]] || exit

  ip="$(ip a|grep inet|grep "[0-9].[0-9].[0-9].[0-9]"|awk '{print $2}'|cut -d\/ -f1|fzf --prompt "Internal IP: ")"
  [[ $ip ]] || exit

  openport
}

function openport(){
  [[ $in_port ]] || in_port=$2
  [[ $ext_port ]] || ext_port=$3
  [[ $ip ]] || ip=$1

  echo -n "Opening port $ext_port to port $in_port on $ip..."
  router="$(ip r | grep default | cut -d " " -f 3)"
  echo -n "."
  gateway="$(upnpc -l|grep 'desc:'|awk '{print $2}')"
  echo "."
  #open port
  echo ": $(date +%s):0;upnpc -u $gateway -a $ip $in_port $ext_port tcp" >> $HOME/.zsh_history
  echo ": $(date +%s):0;upnpc -u $gateway -d $ext_port tcp" >> $HOME/.zsh_history
  upnpc -u $gateway -a $ip $in_port $ext_port tcp

  exit
}

function closeport(){
  command="$(grep upnpc ~/.zsh_history|grep '\-d'|grep -v 'grep'|cut -d\; -f2|fzf)"
  echo "Closing Port"
  $command
  exit
}

[[ "$1" == "close" ]] && closeport
[[ $# == 3 ]] && openport $*
getinput