通过 DDNS 解决宽带拨号 ip 变化问题

Posted 2021-01-06 张玉坤

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前面你的文章我已经写了写了 DMZ 内网映射的方式。这样内网主机已经暴露在外网中了。但是拨号上网我们的ip是会变化的。大概规律就是每次拨号都会变化。如果不拨号，每 24 小时 ip也会自动变化一次。

怎么解决呢？那就是使用域名。我们通过域名来访问这台机子。并且在 ip 变化的时候，让让域名对应的ip 也跟着变化。这个过程叫做 DDNS 。就是动态域名解析。

DDNS 很多地方都有提供。阿里有。腾讯云也有。我目前有的域名是腾讯的。所以就用腾讯实现好了。首先找到腾讯 yun api。

这个接口就是给我们修改域名和ip对应关系的。所有我们只需要获取到本地的外网ip然后调用这个接口就可以了。

我的实现方式是通过 java 程序。每隔一段时间取获取本地ip，和上一次的ip做比较，如果不一样，就调用腾讯云的接口。并且把这个程序加入到开机启动。

代码实现：

package com.sbl.pay.subaccount;

public class DDNSParam {
    
    
    public String Action = "RecordModify";
    public Long Nonce = (long) (Math.random()*10000);
    //public String Region = "ap-chengdu";
    public Long Timestamp = System.currentTimeMillis()/1000;
    public String SecretId = "填你自己的id";
    public String SignatureMethod = "HmacSHA1";
    public String Signature = "";
    
    
    
    
    
    
    public String domain = "zhangyukun.club";
    public int recordId  = 380731049;
    public String subDomain = "home";
    public String recordType = "A";
    public String recordLine = "默认";
    public String value = "112.193.146.167";
    
    
    
    
    public String getDomain() {
        return domain;
    }
    public void setDomain(String domain) {
        this.domain = domain;
    }
    public String getRecordLine() {
        return recordLine;
    }
    public void setRecordLine(String recordLine) {
        this.recordLine = recordLine;
    }
    public String getRecordType() {
        return recordType;
    }
    public void setRecordType(String recordType) {
        this.recordType = recordType;
    }
    public String getSubDomain() {
        return subDomain;
    }
    public void setSubDomain(String subDomain) {
        this.subDomain = subDomain;
    }
    public String getValue() {
        return value;
    }
    public void setValue(String value) {
        this.value = value;
    }
    public String getAction() {
        return Action;
    }
    public void setAction(String action) {
        Action = action;
    }
    public Long getNonce() {
        return Nonce;
    }
    public void setNonce(Long nonce) {
        Nonce = nonce;
    }
    public Long getTimestamp() {
        return Timestamp;
    }
    public int getRecordId() {
        return recordId;
    }
    public void setRecordId(int recordId) {
        this.recordId = recordId;
    }
    public void setTimestamp(Long timestamp) {
        Timestamp = timestamp;
    }
    public String getSecretId() {
        return SecretId;
    }
    public void setSecretId(String secretId) {
        SecretId = secretId;
    }
    public String getSignatureMethod() {
        return SignatureMethod;
    }
    public void setSignatureMethod(String signatureMethod) {
        SignatureMethod = signatureMethod;
    }
    public String getSignature() {
        return Signature;
    }
    public void setSignature(String signature) {
        Signature = signature;

    }

}

package com.sbl.pay.subaccount;

import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import com.sbl.pay.subaccount.util.BeanUtils;
import com.sbl.pay.subaccount.util.Core;
import com.sbl.pay.subaccount.util.HttpUtils;

public class Main {

	public static void main(String[] args) {
		
		String url = "https://cns.api.qcloud.com/v2/index.php";

		Map<String, String> params = new HashMap<String, String>();

		DDNSParam param = new DDNSParam();
		
		String urlStr = Core.createLinkString(   BeanUtils.objectToMap( param ) );
		urlStr = "GETcns.api.qcloud.com/v2/index.php?" + urlStr;
		
		String signature = hmacSha1(urlStr, "你的密钥" );
		param.setSignature( signature  );
		params = BeanUtils.objectToStringMap(param);

		String s = HttpUtils.get(url, params);
		System.out.println(s);
		
	}

	public static String hmacSha1(String src, String key) {
        try {
            SecretKeySpec signingKey = new SecretKeySpec(key.getBytes("utf-8"), "HmacSHA1");
            Mac mac = Mac.getInstance("HmacSHA1");
            mac.init(signingKey);
            byte[] rawHmac = mac.doFinal(src.getBytes("utf-8"));
            return Base64.getEncoder().encodeToString( rawHmac );
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}

结果： {"code":0,"message":"","codeDesc":"Success","data":[]}

下面就是获取公网ip：中秋有空，所以搞了一下获取公网IP。百度搜索IP。页面会显示你的公网IP 。所以把这个拔下来就可以了。如果你觉得百度公网Ip 不正确。那么你可以拔你们家路由器管理界面的。

package com.sbl.pay.subaccount;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;

import org.apache.commons.io.IOUtils;
import org.htmlparser.Parser;
import org.htmlparser.filters.AndFilter;
import org.htmlparser.filters.HasAttributeFilter;
import org.htmlparser.filters.TagNameFilter;
import org.htmlparser.util.NodeList;
import org.htmlparser.util.ParserException;

public class IPGet {

	public static void main(String[] args) throws Exception {
		System.out.println( getPublicNetworkIP() );
	}

	/**
	 * 得到公网IP
	 * @return
	 * @throws FileNotFoundException
	 * @throws IOException
	 * @throws ParserException
	 */
	public static String getPublicNetworkIP() throws FileNotFoundException, IOException, ParserException {
		Parser parser = new Parser( new URL("https://www.baidu.com/s?ie=UTF-8&wd=ip").openConnection() );

		String a = IOUtils.toString(new FileInputStream(new File("C:\\\\Users\\\\ZHANGYUKUN\\\\Desktop\\\\aaa.html")));

		parser.setInputHTML(a);

		AndFilter filter = new AndFilter(new TagNameFilter("span"), new HasAttributeFilter("class", "c-gap-right"));

		NodeList nodeList = parser.parse(filter);

		String ipStr = nodeList.elementAt(0).getChildren().elementAt(0).getText() ;
		ipStr = ipStr.replaceAll("本机IP: ", "");
		return ipStr;
	}

}

结果如下：