# $NetBSD: t_repeated_mtu.sh,v 1.2 2020/12/10 08:16:59 mrg Exp $
#
# Copyright (c) 2020 The NetBSD Foundation, Inc.
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#
# This code is derived from software contributed to The NetBSD Foundation
# by Jukka Ruohonen.
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# are met:
# 1. Redistributions of source code must retain the above copyright
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atf_test_case repeated_mtu
repeated_mtu_head() {
	atf_set "require.user" "root"
	atf_set "descr" "Check with ifconfig(8) that setting MTUs works"
}

repeated_mtu_body() {

	if ! [ $(atf_config_get "run_unsafe" "no") = "yes" ]
	then
		atf_skip "can disrupt networking; also PR port-evbarm/55521"
	fi

	# This sequence covers both valid and invalid MTUs; we are
	# only interested in testing that the system does not hang.
	#
	mtus=$(seq -10000 1000 90000)

	for i in $(ifconfig -l); do

		mtu=$(ifconfig $i | grep "mtu" | sed "s/.*mtu //")

		if [ -z $mtu ]; then
			echo "Skipping $i"
			continue
		fi

		for j in $mtus; do
			echo "Request: ifconfig $i mtu $j"
			ifconfig $i mtu $j >/dev/null 2>&1
		done

		ifconfig $i mtu $mtu
		echo "Restored the MTU of $i to $mtu"
	done
}

atf_init_test_cases() {
	atf_add_test_case repeated_mtu
}