From 6aa89eaef7eeffbd9bbd35ad79d5850159e00245 Mon Sep 17 00:00:00 2001
From: tiennm99 <tiennm99@outlook.com>
Date: Wed, 22 May 2024 20:18:32 +0700
Subject: [PATCH] [Add] init

---
 update-dns/README.md | 26 +++++++++++++++++++++++++-
 update-dns/main.sh   | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 update-dns/main.sh

diff --git a/update-dns/README.md b/update-dns/README.md
index 5c6db50..6e13fd2 100644
--- a/update-dns/README.md
+++ b/update-dns/README.md
@@ -1 +1,25 @@
-Update CloudFlare DNS records with dynamic IP
+# update-dns
+
+Update CloudFlare DNS records with dynamic IP when your IP is behind router's IP.
+
+## How to use this script
+
+```bash
+git clone https://github.com/tiennm99/update-dns
+cd update-dns
+nano main.sh
+# Edit value in the script
+./main.sh
+```
+
+You can also use the script with cronjob to update your IP every 5 minutes
+
+```bash
+crontab -e
+# Add the following line to the file
+*/5 * * * * /path/to/main.sh
+```
+
+## __Note:__
+You may need to config your router to forward the ports you wanted to the exact machine.
+If you have problems, let's discuss in the discussions section.
diff --git a/update-dns/main.sh b/update-dns/main.sh
new file mode 100644
index 0000000..cda54b9
--- /dev/null
+++ b/update-dns/main.sh
@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# Configuration
+CF_EMAIL="your@email.com"
+CF_API_KEY="your_cloudflare_api_key"
+ZONE_ID="your_zone_id"
+RECORDS=("subdomain1.example.com" "subdomain2.example.com" "subdomain3.example.com")
+
+# Get current IP address using upnpc
+CURRENT_IP=$(upnpc -s | awk -F'= ' '/ExternalIPAddress/ { print $2 }')
+
+# Function to update DNS record
+update_record() {
+    local record="$1"
+    local record_id=$(curl -sX GET "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records?type=A&name=$record" \
+        -H "X-Auth-Email: $CF_EMAIL" \
+        -H "Authorization: Bearer $CF_API_KEY" \
+        -H "Content-Type: application/json" | jq -r '.result[0].id')
+
+    if [ -n "$record_id" ]; then
+        curl -sX PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$record_id" \
+            -H "X-Auth-Email: $CF_EMAIL" \
+            -H "Authorization: Bearer $CF_API_KEY" \
+            -H "Content-Type: application/json" \
+            --data "{\"type\":\"A\",\"name\":\"$record\",\"content\":\"$CURRENT_IP\"}"
+        echo "Updated $record to $CURRENT_IP"
+    else
+        echo "Error: $record not found"
+    fi
+}
+
+# Update DNS records
+for record in "${RECORDS[@]}"; do
+    update_record "$record"
+done