IPv6 DDNS via Cloudflare

gistfile1.txt

#!/usr/bin/env bash

# This script update IPv6 address to Cloudflare and send notification message via WxPusher.
# with `crontab -e` to set periodical task.

set -x
 
ZONE_ID={}
TOKEN_KEY={}
TARGET={}

WXTOKEN={}
WXUID={}

echo "DDNS BEGIN"
 
new_ipv6=$(/usr/sbin/ip -6 a | awk -F '[ \t]+|/' '/inet6/ && $3 != "::1" && $3 !~ /^fe80::/ && $3 !~ /^fda8:/ {ipv6=$3; getline; if ($2=="valid_lft") {split($3, t, "sec"); if (t[1] > max) {max=t[1]; best=ipv6}}} END {print best}')
 
records=$(curl https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records \
               -H "Authorization: Bearer $TOKEN_KEY" \
               -H 'Content-Type: application/json')
old_ipv6=$(echo $records | python3 -c "import sys, json; print([record for record in json.load(sys.stdin)['result'] if record['name'] == '$TARGET'][0]['content'])")
record_id=$(echo $records | python3 -c "import sys, json; print([record for record in json.load(sys.stdin)['result'] if record['name'] == '$TARGET'][0]['id'])")
 
if [ ! -z "$new_ipv6" ] && [ "$old_ipv6" != "$new_ipv6" ]
then
    curl https://api.cloudflare.com/client/v4/zones/$ZONE_ID/dns_records/$record_id \
    -X PATCH \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $TOKEN_KEY" \
    -d "{\"content\": \"$new_ipv6\"}"

    updates="DDNS: pi.jiuh.top --> $new_ipv6"
    cmd=$(cat <<EOF
curl --request POST \
-H "Content-type: application/json" \
-d "{\"appToken\":\"$WXTOKEN\",\"content\":\"${updates}\",\"contentType\":1,\"uids\":[\"$WXUID\"]}" \
https://wxpusher.zjiecode.com/api/send/message
EOF
)
    echo $cmd | at 9:00 AM
fi
 
echo "DDNS END"