64 lines
2.8 KiB
Bash
64 lines
2.8 KiB
Bash
#!/bin/bash
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#
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#. Description:
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#. This script will keep a CloudFlare DNS record up to date with your current public IP address
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#. It will use 'dig' to query the IP address for the DNS record, then compare that IP to your current public IP.
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#. If the two IP's do not match, the DNS record will be updated with the current IP address via
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#. Cloudfare's API.
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#
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#. Usage:
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#. Enter your details for the variables below, then schedule this script to run every 15 or 30 min via cron.
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#. The script will output Success/Failure/Skip details that can be easily redirected to a log file.
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#
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#. Example Crontab Entry:
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#. */15 * * * * root /path/to/dns_updater.sh >> /var/log/dns_updater.log 2>&1
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#
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#. Author: Rich Oberholtzer (2/2021)
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CLOUDFLARE_API_KEY="API KEY HERE"
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AUTH_EMAIL="user@example.com"
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#. Can be found by logging in to your Cloudflare account, click the site/zone, scroll down to the bottom.
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#. You'll see it listed on the right side of the page.
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ZONE_ID="ZONE ID NUMBER HERE"
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#This can only be gotten by using the API to get a list of records for the zone.
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# Reference: https://api.cloudflare.com/#dns-records-for-a-zone-list-dns-records
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RECORD_ID="RECORD ID NUMBER HERE"
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RECORD_NAME="example.com"
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RECORD_TYPE="A"
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TTL=1
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#Get the current IP address for the DNS record
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RECORD_IP="$(dig @1.1.1.1 $RECORD_NAME | grep $RECORD_NAME | grep -v ';' | awk '{ print $5} ')"
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# Get the current public IP address
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IP="$(curl -s http://ipinfo.io/ip 2> /dev/null)"
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DATE=$(date +%Y%m%d-%H%M%S)
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#If the RECORD_IP and IP do not match, then we need to update the record information.
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if [ "$RECORD_IP" != "$IP" ]; then
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# Make the API call to update the DNS record and save the response details for confirmation of success/failure.
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RESPONSE=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$RECORD_ID" \
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-H "X-Auth-Email: $AUTH_EMAIL" \
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-H "X-Auth-Key: $CLOUDFLARE_API_KEY" \
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-H "Content-Type: application/json" \
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--data '{"type":"$RECORD_TYPE","name":"'$RECORD_NAME'","content":"'$IP'","ttl":'$TTL'}')
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# Output appropriate status details depending on whether or not the API call was successful or not
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# If it failed, we want dump out the entire response for troubleshooting.
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if [ $(echo "$RESPONSE" | grep '"success":true' | wc -l) -eq 1 ]; then
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echo "$DATE|Record IP: $RECORD_IP|Pub IP: $IP|CF Update: Success"
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else
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echo "$DATE|Record IP: $RECORD_IP|Pub IP: $IP|CF Update: Failure"
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echo "Response: $RESPONSE"
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fi
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else
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# The current public IP address matches the IP address for the DNS record.
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# There is nothing to do, yay!
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echo "$DATE|Record IP: $RECORD_IP|Pub IP: $IP|CF Update: Skipped"
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fi
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