From 2e92dbeb72c1c5ab45f6e3b03e170412a1e52a12 Mon Sep 17 00:00:00 2001
From: Logan G <logan@qtechofficial.com>
Date: Sat, 17 Feb 2024 02:19:57 -0700
Subject: [PATCH] Added Njalla OpenWRT DDNS script

---
 openwrt-njalla-ddns.sh | 43 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 openwrt-njalla-ddns.sh

diff --git a/openwrt-njalla-ddns.sh b/openwrt-njalla-ddns.sh
new file mode 100644
index 0000000..d3852ad
--- /dev/null
+++ b/openwrt-njalla-ddns.sh
@@ -0,0 +1,43 @@
+#!/bin/ash
+
+IP_TEMPFILE=/tmp/wanip
+NJALLA_SUBDOMAIN="thing.com"
+NJALLA_KEY="1234"
+
+
+# Gets the current WAN interface and IP(s)
+. /lib/functions/network.sh
+network_flush_cache
+network_find_wan NET_IF
+network_find_wan6 NET_IF6
+network_get_ipaddr NET_ADDR "${NET_IF}"
+network_get_ipaddr6 NET_ADDR6 "${NET_IF6}"
+
+if [ "$1" = "--query" ]; then
+    echo "Querying IP from DNS server"
+    NET_ADDR_OLD="$(nslookup -type=a ${NJALLA_SUBDOMAIN} | awk '/^Address: / { print $2 }')"
+    NET_ADDR6_OLD="$(nslookup -type=aaaa ${NJALLA_SUBDOMAIN} | awk '/^Address: / { print $2 }')"
+else
+    if [ -f ${IP_TEMPFILE} ]; then
+        . ${IP_TEMPFILE}
+    else
+        NET_ADDR_OLD="$(nslookup -type=a ${NJALLA_SUBDOMAIN} | awk '/^Address: / { print $2 }')"
+        NET_ADDR6_OLD="$(nslookup -type=aaaa ${NJALLA_SUBDOMAIN} | awk '/^Address: / { print $2 }')"
+        echo "NET_ADDR_OLD=${NET_ADDR}" > $IP_TEMPFILE
+        echo "NET_ADDR6_OLD=${NET_ADDR6}" >> $IP_TEMPFILE
+    fi
+fi
+
+if [ "$NET_ADDR" != "$NET_ADDR_OLD" ] || [ "$NET_ADDR6" != "$NET_ADDR6_OLD" ] || [ "$1" = "--force" ]; then
+    echo "IPv4: ${NET_ADDR_OLD} => ${NET_ADDR}"
+    echo "IPv6: ${NET_ADDR6_OLD} => ${NET_ADDR6}"
+
+    wget -q -O /dev/null "https://njal.la/update/?h=${NJALLA_SUBDOMAIN}&k=${NJALLA_KEY}&a=${NET_ADDR}&aaaa=${NET_ADDR6}"
+    STATUS=$?
+    if [ $STATUS -ne 0 ]; then
+        echo "Could not set DDNS IP! (${STATUS})"
+    fi
+
+    echo "NET_ADDR_OLD=${NET_ADDR}" > $IP_TEMPFILE
+    echo "NET_ADDR6_OLD=${NET_ADDR6}" >> $IP_TEMPFILE
+fi