通过dnspod api实现动态ddns更新ip，ipv4和ipv6支持，shell脚本如下：
#!/bin/bash
token="www.haiyun.me"
domain="haiyun.me"
if which jq > /dev/null; then
json="jq"
elif which jsonfilter > /dev/null; then
json="jsonfilter"
else
echo 'please install jq or jsonfilter'
exit
fi
if ! which curl > /dev/null || ! which curl > /dev/null; then
echo 'please install curl and grep'
exit
fi
if [[ $1 == "list" ]]; then
curl -s -d "login_token=$token&format=json&domain=$domain" "https://dnsapi.cn/Record.List" | jq -r -M '.records[]|.name + "\t\t " + .type + "\t\t " + .value'
exit
fi
if [[ $1 == "delete" ]]; then
if [[ ! $3 || ! $2 ]]; then
echo 'use ddns.sh delete name type'
exit
fi
id=$(curl -s -d "login_token=$token&format=json&domain=$domain" "https://dnsapi.cn/Record.List" | jq -r -e ".records | .[] | select(.name == \"$2\" and .type == \"${3^^}\")|.id")
if [[ $id ]]; then
if curl -s -d "login_token=$token&format=json&domain=$domain&record_id=$id" https://dnsapi.cn/Record.Remove | grep -q '"code":"1"'; then
echo "sus"
fi
else
echo 'no record'
fi
exit
fi
if [[ ! $1 || ! $2 ]]; then
echo 'use ddns.sh name ip'
echo 'use ddns.sh list'
echo 'use ddns.sh delete name type'
exit
fi
name=$1
new_ip=$2
if [[ $new_ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
#sleep 10
#curl http://192.168.168.6/announce.php --silent --output /dev/null
record_type='A'
echo 'ipv4'
elif [[ $new_ip =~ ^([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}$ ]]; then
echo 'ipv6'
record_type='AAAA'
else
echo "invalid IP address $new_ip"
#logger -t ddns "invalid IP address $new_ip"
exit
fi
curl -s -d "login_token=$token&format=json&domain=$domain" "https://dnsapi.cn/Record.List" -o /tmp/dns.txt
if ! grep -q '"code":"1"' /tmp/dns.txt; then
echo 'get record list error'
exit
fi
if [[ $record_type == "AAAA" ]]; then
if [[ $json == "jq" ]]; then
id=$(jq -r -e ".records | .[] | select(.name == \"$name\" and .type == \"AAAA\")|.id" /tmp/dns.txt)
ip=$(jq -r -e ".records | .[] | select(.name == \"$name\" and .type == \"AAAA\")|.value" /tmp/dns.txt)
else
ip=$(jsonfilter -i /tmp/dns.txt -e "@.records[@.name='$name'&&@.type='AAAA'].value")
id=$(jsonfilter -i /tmp/dns.txt -e "@.records[@.name='$name'&&@.type='AAAA'].id")
fi
elif [[ $record_type == "A" ]]; then
if [[ $json == "jq" ]]; then
id=$(jq -r -e ".records | .[] | select(.name == \"$name\" and .type == \"A\")|.id" /tmp/dns.txt)
ip=$(jq -r -e ".records | .[] | select(.name == \"$name\" and .type == \"A\")|.value" /tmp/dns.txt)
else
ip=$(jsonfilter -i /tmp/dns.txt -e "@.records[@.name='$name'&&@.type='A'].value")
id=$(jsonfilter -i /tmp/dns.txt -e "@.records[@.name='$name'&&@.type='A'].id")
fi
fi
#echo $name;
#echo $id;
#echo $ip;
#echo $new_ip;
if [[ $ip == $new_ip ]]; then
echo 'no update needed'
exit
fi
if [[ $id ]]; then
echo "mod ip"
if curl -s -d "login_token=$token&format=json&domain=$domain&record_id=$id&value=$new_ip&record_type=$record_type&record_line_id=0&sub_domain=$name" https://dnsapi.cn/Record.Modify | grep -q '"code":"1"'; then
echo "sus"
fi
else
echo "add ip"
if curl -s -d "login_token=$token&format=json&domain=$domain&sub_domain=$name&record_type=$record_type&record_line_id=0&value=$new_ip" https://dnsapi.cn/Record.Create | grep -q '"code":"1"'; then
echo "sus"
fi
fi在/lib/netifd/ppp-up文件内调用上面的脚本，当pppoe网络连接成功时会执行此文件，$4变量为pppoe连接的本地IP。
/usr/bin/update-ip.sh name $4 > /dev/null 2>&1 &pppoe只能传递公网ipv4，使用ifstatus可获取pppoe接口ipv6地址和分配内网的ipv6前缀，根据mac生成的ipv6后缀可为内网其它机器做ddns。
ifstatus wan_6
ifstatus wan
ubus call network.interface dump
jsonfilter -i /tmp/wan6.txt -e '@["ipv6-prefix"][0].address'
jsonfilter -i /tmp/wan6.txt -e '@["ipv6-address"][0].address' 
