From df9aedf997906e71010405ca02d53ea51e5ee363 Mon Sep 17 00:00:00 2001
From: zeus <rootapostolos@swarmlab.io>
Date: Wed, 12 Jan 2022 21:13:46 +0200
Subject: [PATCH] add

---
 check-open.sh | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100755 check-open.sh

diff --git a/check-open.sh b/check-open.sh
new file mode 100755
index 0000000..13e6abd
--- /dev/null
+++ b/check-open.sh
@@ -0,0 +1,15 @@
+function EPHEMERAL_PORT() {
+    LOW_BOUND=49152
+    RANGE=16384
+    while true; do
+        CANDIDATE=$[$LOW_BOUND + ($RANDOM % $RANGE)]
+        (echo "" >/dev/tcp/127.0.0.1/${CANDIDATE}) >/dev/null 2>&1
+        if [ $? -ne 0 ]; then
+            echo $CANDIDATE
+            break
+        fi
+    done
+}
+
+port=$(EPHEMERAL_PORT)
+echo $port