64 lines
3.4 KiB
Bash
64 lines
3.4 KiB
Bash
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#!/bin/bash
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# AUTHOR: Josh North
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# EMAIL: josh.north@point808.com
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# BRIEF: This script updates CloudFlare IPv6 DNS records with your current IP
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# address, as pulled from the interface directly. Best use case is having an
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# ISP who arbitrarily changes your prefix. For safety, we do not create
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# records, we only update records that match the hostname in the zone, so
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# you must log in to CloudFlare and create your records first!
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# USAGE: Put this file in /usr/local/bin/cfddnsv6.sh or wherever you prefer is ok.
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# Make sure to chmod +x and make it executable. Change the settings below to
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# Match your login and environment needs. Run it from command line to test.
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# Right now we run this from cron--- at reboot and every so often after.
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# This example runs it at reboot and every half hour, adjust to taste
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# @reboot /usr/local/bin/cfddnsv6.sh >/dev/null 2>&1
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# */30 * * * * /usr/local/bin/cfddnsv6.sh >/dev/null 2>&1
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# SETTINGS:
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CF_EMAIL="you@zone.com" # Email address you use to log in to CloudFlare.
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CF_KEY="YourApiKeyHere" # API key for CloudFlare account (get from Account Settings page).
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CF_ZONE="zone.com" # MUST match zone you want to update host in!
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CF_HOST="webserver" # Hostname of record. Create in CloudFlare first!
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CF_IF="eth0" # What interface should we get the IP address for?
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CF_LOG="/var/log/cfddnsv6.log" # Where to log actions taken by this script.
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# -------------------- NOTHING TO CHANGE BELOW THIS LINE --------------------
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# CloudFlare API URI
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CF_URL="https://api.cloudflare.com/client/v4"
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CF_AUTH=(-H "X-Auth-Email: $CF_EMAIL" -H "X-Auth-Key: $CF_KEY" -H "Content-Type: application/json")
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CURLCMD="curl -sS -X"
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# Make sure we have all needed programs
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command -v curl >/dev/null 2>&1 || { echo "This script requires curl but I cannot find it on this system... Exiting now." >&2; exit 1; }
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# Log start of script
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printf "%s\n" "$(date) Beginning DNS update process" >> $CF_LOG
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# This is a pause to wait for tentative addresses to disappear. You may comment this out if you have reason to do so, I include it because in my networks, these addresses go away.
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while ip -6 addr show tentative | grep . > /dev/null ; do sleep 1 ; done
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# Try to get the best global address from the chosen interface
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CF_IPV6=$(ip addr show dev $CF_IF | grep -Ev "deprecated" | sed -e's/^.*inet6 \([^ ]*\)\/.*$/\1/;t;d' | grep -Ev "^fd|^fe80" | sed -n '$p')
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# Look up CloudFlare zone identifier
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CF_ZONE_ID=$($CURLCMD GET "$CF_URL/zones?name=$CF_ZONE" "${CF_AUTH[@]}" | cut -d '"' -f6)
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# Get record identifier from CloudFlare
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CF_RECORD_ID=$($CURLCMD GET "$CF_URL/zones/$CF_ZONE_ID/dns_records?type=AAAA&name=$CF_HOST.$CF_ZONE" "${CF_AUTH[@]}" | cut -d '"' -f6)
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# Log what we are going to try
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printf "%s\n" "$(date) IP on $CF_IF is $CF_IPV6" >> $CF_LOG
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printf "%s\n" "$(date) Record to update is $CF_HOST.$CF_ZONE ($CF_RECORD_ID)" >> $CF_LOG
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# Build the request string and submit
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CF_REQUEST=$($CURLCMD PUT "$CF_URL/zones/$CF_ZONE_ID/dns_records/$CF_RECORD_ID" "${CF_AUTH[@]}" \
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--data "{\"id\":\"$CF_RECORD_ID\",\"type\":\"AAAA\",\"name\":\"$CF_HOST\",\"content\":\"$CF_IPV6\",\"zone_id\":\"$CF_ZONE_ID\",\"zone_name\":\"$CF_ZONE\",\"data\":{}}" | sed -n -e 's/^.*\("success":\)/\1/p')
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# Log output
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printf "%s\n" "$(date) Result string is $CF_REQUEST" >> $CF_LOG
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# All done
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exit 0
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# EOF
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