Cloudflare DDNS shell script

cloudflare_ddns.sh

#!/bin/sh

EMAIL=
CF_API_KEY=
CF_ZONE_ID=
CF_DNS_ID=

DNS_RECORD=
RECORD_TYPE=AAAA

ROUTER_NETWORK_DEVICE=

# 获取当前 DNS 记录
resolving_ip=$(curl -k -X GET "https://api.cloudflare.com/client/v4/zones/${CF_ZONE_ID}/dns_records/${CF_DNS_ID}" -H "X-Auth-Email:${EMAIL}" -H "X-Auth-Key:${CF_API_KEY}" -H "Content-Type: application/json" | awk -F '"' '{print $18}')

# 获取本机 ipv6 地址
current_ip=$(ip -o -6 addr list $ROUTER_NETWORK_DEVICE | awk '{print $4}' | cut -d/ -f1 | head -n 1)

echo "当前解析 IP: $resolving_ip"
echo "当前本机 IP: $current_ip"

# 没有变化
if [ $resolving_ip = $current_ip ];
    then
    echo "IP 未变化"

# 修改 DNS 记录
else
    echo "更新解析记录"
    curl -k -X PUT "https://api.cloudflare.com/client/v4/zones/${CF_ZONE_ID}/dns_records/${CF_DNS_ID}" -H "X-Auth-Email:${EMAIL}" -H "X-Auth-Key:${CF_API_KEY}" -H "Content-Type: application/json" --data '{"type":"'$RECORD_TYPE'","name":"'$DNS_RECORD'","content":"'$current_ip'"}'
fi

echo " "