reachdomain

#!/bin/sh

help() {
    echo
    echo "Checks if a specific site/domain is available"
    echo
    echo "Options:"
    echo "-d <domain> A domain to ping / curl to check if it is available. Default: google.com"
    echo "-v          Verbose mode"
    echo
}

[ "$1" =  "--help" ] && help && exit

DOMAIN="google.com"

while getopts d:c:vh arg; do
    case ${arg} in
        d) DOMAIN=${OPTARG} ;;
        v) VERBOSE=1 ;;
        h) help && exit ;;
        *) help && exit 1 ;;
    esac
done

[ -z "$DOMAIN" ] && help && exit 1

if ping -c 4 "$DOMAIN" > /dev/null 2>&1; then
    SUCCESS=1
else
    [ -n "$VERBOSE" ] && echo "Ping failed, trying again with curl in case pings are blocked"
    curl -s "$DOMAIN" > /dev/null && SUCCESS=1
fi

if [ -n "$SUCCESS" ]; then
    [ -n "$VERBOSE" ] && echo "Successfully reached domain $DOMAIN"
    exit 0
else
    [ -n "$VERBOSE" ] && echo "Domain $DOMAIN is unreachable"
    exit 1
fi