http_post() {
	if [ $# != 2 ]; then
		echo "Usage: http_post <url> <data>" 1>&2
		return 255
	fi
	#curl "$1" --request POST --data-binary "$2"
	wget --no-verbose "$1" --post-data "$2"
}

get_ip_address() {
	if [ $# != 1 ]; then
		echo "Usage: get_ip_address <interface>" 1>&2
		return 255
	fi
	ifconfig "$1" | grep -Eo -m 1 'inet[ a-z:]+172\.20\.0\.[0-9]{3}' | sed -r 's/^inet[ a-z:]+//'
	return 0
}
