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#!/usr/bin/env bash

progname=sping
usage="usage: $progname <prefix> <source> <mask> <dev> <opts>..

example:
	$progname 10.0 41 16 eth0
"

function sping24 () {
	local _opts="-a -t 300 -p 1 -i 1 -e -A"
	local _dev=$1
	local _label=$1:spingvip
	local _source=$2
	local _prefix=$3
	local _mask=/24
	shift 3
	
	echo >&2 sping: ip addr add local $_prefix.$_source$_mask dev $_dev label $_label
	                ip addr add local $_prefix.$_source$_mask dev $_dev label $_label
	
	echo >&2 sping: fping $_opts -g $_prefix.0$_mask -S $_prefix.$_source $@
	                fping $_opts -g $_prefix.0$_mask -S $_prefix.$_source $@ 2>&1 | grep -v ICMP
	
	echo >&2 sping: ip addr del local $_prefix.$_source$_mask dev $_dev label $_label
	                ip addr del local $_prefix.$_source$_mask dev $_dev label $_label
}

function sping () {
	[[ $# -lt 4 ]] && echo "$usage" && return 1
	
	local prefix=${1%%.}
	local source=${2##.}
	local mask=$3
	local dev=$4
	local opts=""
	[[ $# -ge 5 ]] && opts="$opts $*"

	export -f sping24
	case $mask in
	8)
		printf '%s\n' $prefix.{0..255}.{0..255}
		;;
	16)
		printf '%s\n' $prefix.{0..255}
		;;
	*)
		printf $prefix
		;;
	esac | /usr/bin/xargs -P16 -n1 -I {} bash -c "sping24 $dev $source {} $opts"
}

sping $@