Activate telnet emergency port on Tomato based firmware

tomato-emergency-telnet.sh

#!/bin/bash
#
# Simple script to trigger the activation of telnet emergency port on Tomato based firmware for SOHO routers
# 

device_ip=$1    # Device ip
hold_time=25    # Recommended value 25, increase second by 1 if you have problem to activate the emergency port
max_tries=3     # Wait for device to spawn emergency port

if [ $# -lt 1 ]; then
    echo -e "\e[1;90m$(sed -ne '/^#$/,/^$/p' $0)\e[m"
    echo -e "  ${0##*/} ip-address\n"
    exit 1
fi

f_ready () {
    read -rsp 'Get ready, press any key to continue ...'
}

f_timer () {
echo
while [ ${hold_time} -gt 0 ]; do
    printf "\r\r\e[1APress and hold WPS or Wifi On/Off button for --> \e[1m${hold_time}\e[m <-- seconds, then release\e[K\n"
    sleep 1
    ((hold_time--))
done
printf "\r\r\e[1A\e[94mRelease button!\e[K\e[m\n"
}

f_connect () {
while true; do 
    if [ $(nc -z -w 3 ${device_ip} 233; echo $?) == 0 ]; then 
        echo -e "\n\e[94m Once connected enter:\e[m nvram get http_passwd \e[94mto retrieve password\e[m\n"
        telnet ${device_ip} 233
        break
    else
        ((retry++))
        echo -ne "\rAttempting to connect, try ${retry} of ${max_tries} ...\e[K"
        sleep 2
    fi
    if [ ${retry} -eq ${max_tries} ]; then echo -e "\n\e[91mConnection failed, try again ...\n\e[m"; exit; fi
done
}

f_ready
f_timer
f_connect