wpa_supplicant wifi script

#!/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/>.
######################################################################

config="/etc/wpa_supplicant/wpa_supplicant.conf"

function error(){
  echo $*
  exit 1
}

function get_device(){
  device="$(ifconfig -a|grep wlp|cut -d\: -f1|head -n1)"
  [[ $device ]] || error "No Device Found"
  echo $device
}

function scan_ssid(){
  [[ $device ]] || error "No Device Found"
  ssid="$(sudo iwlist "$device" scan|grep ESSID|cut -d\" -f2|sort -u|fzf --prompt "Select a Network: ")"
  [[ $ssid ]] || error "No SSID Selected"
}

function save_config(){
  read -p "Enter Pass Phrase for Network: " pass
  [[ $pass ]] || error "No Pass Phrase Entered"
  [[ $ssid ]] || error "No SSID Selected"
  config="$(sudo wpa_passphrase $ssid $pass)"
  echo "$config"
  echo ""
  read -p "Add above to wpa_supplicant.conf [Y/n]? " confirm
  [[ "$confirm" == "n" ]] && exit
  echo $config |sudo tee -a $config

  #reset permissions
  sudo chmod 0600 /etc/wpa_supplicant/wpa_supplicant.conf
}

function connect2network(){
  [[ $device ]] || error "No Device Found"
  sudo ifconfig $device down
  sudo ifconfig $device up

  sudo wpa_supplicant -B -c $config -i $device
  sudo ip address add 192.168.1.108/24 brd dev $device
  sudo ip route add 192.168.1.1 dev $device
  sudo ip route add default via 192.168.1.1 dev $device
  echo "nameserver 8.8.8.8" |sudo tee -a /etc/resolv.conf

  sudo dhcpclient $deivce
}

function new_network(){
  get_device
  scan_ssid
  save_config
  connect2network
  test_connection
}

function test_connection(){
  ip a
  ping -c 3 192.168.1.1
  ping -c 3 google.com
}

new_network
#read -p "Connect to Network [Y/n]?" connect
#[[ "$connect" != "n" ]] && connect2network

read -p "Press Enter to Continue."
cat $config