#!/bin/bash

if [[ "$1" == "-h" ]]
then
    echo "myip [-i] | [-a] | [-h]"
    echo "default: external IP"
    echo "     -i: internal IP"
    echo "     -a: internal + external IP"
else
    if [[ "$1" == "-a" ]]
    then
            INT_FLAG="TRUE"
            EXT_FLAG="TRUE"
        VERBOSE_FLAG="TRUE"
    else
        VERBOSE_FLAG="FALSE"
        
        if [[ "$1" == "-i" ]]
        then
            INT_FLAG="TRUE"
            EXT_FLAG="FALSE"
        else
            INT_FLAG="FALSE"
            EXT_FLAG="TRUE"
        fi
    fi
fi


if [[ ${VERBOSE_FLAG} == "TRUE" ]]
then
    INT_LABEL="internal_ip: "
    EXT_LABEL="external_ip: "
else
    INT_LABEL=""
    EXT_LABEL=""
fi


if [[ ${INT_FLAG} == "TRUE" ]]
then
    INT_IP="$( curl -s  http://www.rx3/cgi-bin/myip.cgi | grep -E '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$')"

    echo "${INT_LABEL}${INT_IP}"
fi

if [[ ${EXT_FLAG} == "TRUE" ]]
then
    EXT_IP="$( dig +short myip.opendns.com @resolver1.opendns.com | grep -E '^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$')"

    echo "${EXT_LABEL}${EXT_IP}"
fi