From 3f150e469db368a58e589ad1bae68c1800fbcae4 Mon Sep 17 00:00:00 2001
From: Joey Hafner <jafner425@gmail.com>
Date: Sun, 7 Aug 2022 14:20:15 -0700
Subject: [PATCH] Init update hairpin nat script

---
 router/scripts/update_hairpin_nat.sh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 router/scripts/update_hairpin_nat.sh

diff --git a/router/scripts/update_hairpin_nat.sh b/router/scripts/update_hairpin_nat.sh
new file mode 100644
index 0000000..f106eeb
--- /dev/null
+++ b/router/scripts/update_hairpin_nat.sh
@@ -0,0 +1,25 @@
+#!/bin/vbash
+source /opt/vyatta/etc/functions/script-template
+
+# create copies of config for modification and backup
+cp /config/config.boot /config/config.new
+cp /config/config.boot /config/backups/config.bk-$(date +%Y-%m-%d)
+# get current public IP
+NEW_IP=$(run show interfaces pppoe pppoe1 | grep "inet\s" | cut -d ' ' -f 6)
+# get old public IP
+OLD_IP=$(run show nat destination rules | grep 1100 | head -1 | cut -d ' ' -f 8)
+
+# edit the config.new file
+sed -i "s/$OLD_IP/$NEW_IP/" /config/config.new
+
+# switch mode to config
+configure
+
+# apply the new config
+load /config/config.new
+{ # try commit, save, exit
+    commit && save && exit
+} || { # catch, exit discard and create a very basic error file
+    exit discard
+    echo "Script failed. Write some real error handling."
+}