src/sshwgcfg

#!/bin/sh

# Copyright 2015-2025 Rivoreo

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
# IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.


if [ $# != 2 ] || [ "$1" != -c ]; then
	echo "Usage: <this-shell?> -c <wg-command-line>" 1>&2
	exit 255
fi

set -f
rncn_command="${2#rncn[ 	]}"
[ "$rncn_command" = "$2" ] && exec wg $2
set -- $rncn_command
set -e
case "$1" in
	set-remote-port)
		if [ $# != 4 ]; then
			echo "Usage: set-remote-port <interface> <peer-pub-key> <new-port>" 1>&2
			exit 255
		fi
		interface="$2"
		public_key="$3"
		new_port="$4"
		wg show "$interface" endpoints | while read -r line; do
			set -- $line
			[ "$1" != "$public_key" ] && continue
			addr="${2%:*}"
			{
				i=0
				while [ $i -lt 5 ]; do
					sleep 1
					wg set "$interface" peer "$1" endpoint "$addr:$new_port"
					i=$((i+1))
				done
			} 0<> /dev/null 1>&0 2>&0 &
			exec wg set "$interface" peer "$1" endpoint "$addr:$new_port"
		done
		exit
		;;
	*)
		echo e! 1>&2
		exit 255
		;;
esac