From b7fb88cb7934147e4c060e63886adae933acd646 Mon Sep 17 00:00:00 2001
From: Knut Ahlers <knut@ahlers.me>
Date: Fri, 16 Aug 2024 13:00:04 +0200
Subject: [PATCH] Add port-knock function

Signed-off-by: Knut Ahlers <knut@ahlers.me>
---
 .zsh/config.sh.d/portknock.sh | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 .zsh/config.sh.d/portknock.sh

diff --git a/.zsh/config.sh.d/portknock.sh b/.zsh/config.sh.d/portknock.sh
new file mode 100644
index 0000000..272adbb
--- /dev/null
+++ b/.zsh/config.sh.d/portknock.sh
@@ -0,0 +1,10 @@
+# pknock provides a port-knock tool based on ncat
+function pknock {
+  HOST="$1"
+
+  # Perform port knocking sequence
+  echo "Knocking requested port sequence (${HOST} - ${*:2})" >&2
+  for i in ${*:2}; do
+    ncat -w 50ms "${HOST}" $i 1>/dev/null 2>&1
+  done
+}