A Pineapple Pager Payload for Toggling the USB-C port between WAN/LAN

usbc_wan_toggle_payload.sh

#!/bin/bash
# Title: USB-C WAN/LAN Toggler
# Author: Geofferey
# Description: Removes eth0 from bridge so it obtains an IP from connected device
# Version: 1.0

PATH=/mmc/bin:/mmc/sbin:/mmc/usr/bin:/mmc/usr/sbin:/usr/sbin:/usr/bin:/sbin:/bin

enable () {

  LOG yellow "Removing eth0 from br-lan..."
  brctl delif br-lan eth0

  if ! ps | grep -q "[u]dhcpc -i eth0 -b"; then

    LOG ""
    LOG yellow "Starting udhcpc on eth0..."
    udhcpc -i eth0 -b -n -q

  fi

  LOG ""

  LOG yellow "Re-add wlan0mgmt to br-lan if up and not a member" 
  if [[ $(ip link show wlan0mgmt |grep "state UP") ]] && [[ ! $(brctl show br-lan |grep wlan0mgmt) ]]; then

    brctl addif br-lan wlan0mgmt

  fi

  if ! nft list chain inet fw4 srcnat | grep -q 'comment "eth0_wan_masquerade"'; then
  
    LOG ""
    LOG yellow "Enabling NAT masquerading on eth0"
    nft insert rule inet fw4 accept_to_wan oifname "eth0" counter accept comment "eth0_wan_fwd"
    nft insert rule inet fw4 srcnat oifname "eth0" jump srcnat_wan comment "eth0_wan_masquerade"

  fi

  sleep 1

  ETH0_IP=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f2 | cut -d ' ' -f1)
  ETH0_BCAST=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f3 | cut -d ' ' -f1)
  ETH0_MASK=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f4 | cut -d ' ' -f1)
  ETH0_GW=$(ip ro |grep default |grep eth0 | cut -d ' ' -f3)

  LOG ""
  LOG green "IP: ${ETH0_IP}"
  LOG yellow "BCAST: ${ETH0_BCAST}"
  LOG red "NETMASK: ${ETH0_MASK}"
  LOG cyan "GATEWAY: ${ETH0_GW}"

}

disable () {

  ETH0_IP=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f2 | cut -d ' ' -f1)

  if nft list chain inet fw4 srcnat | grep -q 'comment "eth0_wan_masquerade"'; then

    LOG cyan "Remove NAT masquerading on eth0"
    ACCPT_HANDLE=$(nft -a list chain inet fw4 accept_to_wan |grep "eth0_wan_fwd" |cut -d '#' -f2 |cut -d ' ' -f3)
    SRCNAT_HANDLE=$(nft -a list chain inet fw4 srcnat |grep "eth0_wan_masquerade" |grep handle |cut -d '#' -f2 | cut -d ' ' -f3)
    nft delete rule inet fw4 accept_to_wan handle $ACCPT_HANDLE
    nft delete rule inet fw4 srcnat handle $SRCNAT_HANDLE

  fi

  LOG ""
  LOG cyan "Removing current IP from eth0..."
  ip addr del ${ETH0_IP}
  LOG ""


  LOG cyan "Re-adding eth0 to br-lan"
  if [[ ! $(brctl show br-lan |grep eth0) ]]; then

    brctl addif br-lan eth0

  fi
  LOG ""

  LOG cyan "Re-add wlan0mgmt to br-lan if up and not a member" 
  if [[ $(ip link show wlan0mgmt |grep "state UP") ]] && [[ ! $(brctl show br-lan |grep wlan0mgmt) ]]; then

    brctl addif br-lan wlan0mgmt

  fi

}

info () {

  ETH0_IP=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f2 | cut -d ' ' -f1)
  ETH0_BCAST=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f3 | cut -d ' ' -f1)
  ETH0_MASK=$(ifconfig eth0 |grep -w "inet addr" | cut -d ':' -f4 | cut -d ' ' -f1)
  ETH0_GW=$(ip ro |grep default |grep eth0 | cut -d ' ' -f3)

  LOG ""
  LOG green "IP: ${ETH0_IP}"
  LOG green "BCAST: ${ETH0_BCAST}"
  LOG green "NETMASK: ${ETH0_MASK}"
  LOG green "GATEWAY: ${ETH0_GW}"

}

LOG ""

LOG yellow "Press [â–²] for WAN mode"
LOG cyan "Press [â–¼] for LAN mode"
LOG green "Press [A] for INFO"
LOG red "Press [B] to CANCEL"

COUNT=1
resp=$(WAIT_FOR_INPUT)

until [[ "${resp}" == "UP" ]] || [[ "${resp}" == "DOWN" ]]; do

  if [[ "${resp}" == "B" ]]; then

    exit 0

  fi

  if [[ "${resp}" == "A" ]]; then

    info
    break

  fi


  if [[ ${COUNT} -eq "1" ]]; then 

   LOG ""

  fi

  LOG red "INVALID: Please press [â–²]/[â–¼]"
  resp=$(WAIT_FOR_INPUT)
  ((COUNT++))

  if [[ ${COUNT} -gt "2" ]]; then

   LOG ""
   LOG red "No valid response received"
   break

  fi

done

LOG ""

if [[ "${resp}" == "UP" ]]; then

  enable 

fi

if [[ "${resp}" == "DOWN" ]]; then

  disable

fi

exit 0