From 91b8808e27b36beec45b304b56f3541ffa7e3921 Mon Sep 17 00:00:00 2001
From: Alexander BC <alexbcberio@noreply.alexbcberio.com>
Date: Sun, 11 May 2025 21:40:13 +0200
Subject: [PATCH] feat: add script to check if a port is publicly accesible

Performs a request to https://canyouseeme.org and checks its output for success
---
 check-port-open/check-port-open.sh | 31 ++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 check-port-open/check-port-open.sh

diff --git a/check-port-open/check-port-open.sh b/check-port-open/check-port-open.sh
new file mode 100644
index 0000000..7c435fa
--- /dev/null
+++ b/check-port-open/check-port-open.sh
@@ -0,0 +1,31 @@
+#!/usr/bin/bash
+
+MIN_PORT=1
+MAX_PORT=65535
+
+PORT=$1
+
+if [ ! $PORT ]; then
+  echo "Usage: $0 <PORT>"
+  exit 10
+fi
+
+if [ $PORT -lt $MIN_PORT ] || [ $PORT -gt $MAX_PORT ]; then
+  echo "Port must be a number between $MIN_PORT and $MAX_PORT"
+  exit 11
+fi
+
+echo "Checking wether port $PORT is open"
+
+RESPONSE=$(curl -s -X POST --url https://canyouseeme.org -d port=$PORT)
+
+echo $RESPONSE | grep -i "I can see your service on" > /dev/null
+SUCCESS=$?
+
+if [ $SUCCESS -eq 0 ]; then
+  echo "Port $PORT is open"
+  exit 0
+else
+  echo "Port $PORT is not open"
+  exit 1
+fi
\ No newline at end of file