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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' 

PHP版本：
https://www.haiyun.me/archives/1186.html

<?php
ini_set('date.timezone','Asia/Shanghai');
if (isset($_REQUEST['id']) && !empty($_REQUEST['id']) && isset($_REQUEST['ip']) && !empty($_REQUEST['ip'])) {
  $ip = trim($_REQUEST['ip']);
  $name =  trim($_REQUEST['id']);
  $token = "www.haiyun.me";
  if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
    $type = "A";
    echo 'ipv4'.PHP_EOL;
  } elseif (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
    $type = "AAAA";
    echo 'ipv6'.PHP_EOL;
  } else {
    echo "invalid IP address $ip".PHP_EOL;
    exit;
  }
  if (($list = getlist($token))) {
    $key = $name.'-'.$type;
    if (isset($list[$key])) {
      if ($ip == $list[$key]['value']) {
        die("no update needed".PHP_EOL);
      } else {
        $list[$key]['value'] = $ip;
      }
    } else {
      $list[$key]['value'] = $ip;
      $list[$key]['record_type'] = $type;
      $list[$key]['sub_domain'] = $name;
    }
    modip($token, $list[$key]);
  }
  file_put_contents('ip/ip.log', date("Y-m-d-H:i:s").'--'.$name.'--'.$_SERVER['REMOTE_ADDR'].'--'.$ip."\n", FILE_APPEND);
}

function modip($token, $value) {
  if (isset($value['record_id'])) {
    $url = "https://dnsapi.cn/Record.Modify";
  } else {
    $url = "https://dnsapi.cn/Record.Create";
  }
  $str = http_build_query($value);
  $post_data = "login_token={$token}&format=json&domain=haiyun.me&record_line_id=0&".$str;;
  $data = post($url, $post_data);
  $data = json_decode($data, 1);
  if (!$data) {
    return '';
  }
  if ($data['status']['code'] == 1) {
    echo "successful".PHP_EOL;
  } else {
    echo $data['status']['message'].PHP_EOL;
  }
}

function getlist($token) {
  $url = "https://dnsapi.cn/Record.List";
  $post_data = "login_token={$token}&format=json&domain=haiyun.me";
  $data = post($url, $post_data);    
  $data = json_decode($data, 1);  
  if ($data['status']['code'] == 1) {
    foreach ($data["records"] as $value) {
      $list[$value['name'].'-'.$value['type']] = array('sub_domain' => $value['name'], 'record_id' => $value['id'], 'record_type' => $value['type'], 'value' => $value['value']);
    }
    return $list;
  }
  return "";
}

function post($url, $post_data) {
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
  curl_setopt($ch, CURLOPT_TIMEOUT, 5);
  curl_setopt($ch, CURLOPT_MAXREDIRS, 5);
  curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0');
  curl_setopt($ch,CURLOPT_POST, 1);
  curl_setopt($ch,CURLOPT_POSTFIELDS, $post_data);
  $data = curl_exec($ch);
  curl_close($ch);
  return $data;
}
?>

shell版本：
https://www.haiyun.me/archives/1305.html