From 9fdc122a71c39128cf745c4c25d003e7e8f61179 Mon Sep 17 00:00:00 2001
From: Ilya Apasov <apasov@users.noreply.github.com>
Date: Tue, 28 Dec 2021 10:00:05 +0200
Subject: [PATCH] fix: check if selected port is already in use

fixes #68
---
 wireguard-install.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/wireguard-install.sh b/wireguard-install.sh
index e8ba13c..b5d23ee 100644
--- a/wireguard-install.sh
+++ b/wireguard-install.sh
@@ -240,6 +240,10 @@ if [[ ! -e /etc/wireguard/wg0.conf ]]; then
 		echo "$port: invalid port."
 		read -p "Port [51820]: " port
 	done
+	until [[ -z "$port" || -z $(lsof -i :"$port") ]]; do
+		echo "Port $port is already in use. Please select another."
+		read -p "Port [51820]: " port
+	done
 	[[ -z "$port" ]] && port="51820"
 	echo
 	echo "Enter a name for the first client:"