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#!/bin/sh
#
# Copyright (C) 2023 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
ddclient -list-protocols | grep -vE 'nsupdate|cloudns' | grep -qw $1
if [ $? -gt 0 ]; then
echo "Error: $1 is not a valid protocol, please choose from the supported list of protocols"
exit 1
fi
exit 0
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