对IPv4进行动态解释

.gitignore

@@ -0,0 +1,7 @@
+*.exe
+.vscode/
+go.sum
+ddns6
+*.cmd
+.env
+ddns4

Dockerfile

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+FROM harbor.ks.easyj.top/zt/alpine:0.1
+
+ENV APP_DIR=/app \
+	DOMAIN=myschools.me \
+	RR=pi \
+	REGIONID=cn-hangzhou \
+  	ACCESSKEYID=LTAI5tJV828nqSqGpkouh1FD \
+	ACCESSSECRET=aiMEp37bHLOjtoJFTDTfpq1o37cGtA
+
+COPY ddns4 ${APP_DIR}/ddns4
+
+WORKDIR ${APP_DIR}
+
+RUN  chmod +x ddns4
+
+CMD ["./ddns4"]

go.mod

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+module myschools.me/suguo/ddns6
+
+go 1.19
+
+require github.com/aliyun/alibaba-cloud-sdk-go v1.62.676
+
+require (
+	github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af // indirect
+	github.com/json-iterator/go v1.1.10 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/opentracing/opentracing-go v1.2.1-0.20220228012449-10b1cf09e00b // indirect
+	gopkg.in/ini.v1 v1.66.2 // indirect
+)

main.go

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+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/aliyun/alibaba-cloud-sdk-go/services/alidns"
+)
+
+// getPublicIP 通过外部 API 获取公网 IPv4 地址
+func getPublicIP() (string, error) {
+	// 使用多个 IP 查询服务作为备选
+	apis := []string{
+		"https://api.ipify.org",
+		"https://ifconfig.me/ip",
+		"https://ipecho.net/plain",
+	}
+
+	for _, api := range apis {
+		resp, err := http.Get(api)
+		if err != nil {
+			log.Printf("Error fetching IP from %s: %v", api, err)
+			continue
+		}
+
+		body, err := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			log.Printf("Error reading response from %s: %v", api, err)
+			continue
+		}
+
+		ip := strings.TrimSpace(string(body))
+		if net.ParseIP(ip) != nil {
+			return ip, nil
+		}
+	}
+
+	return "", fmt.Errorf("failed to get public IP from all APIs")
+}
+
+func main() {
+	domain := os.Getenv("DOMAIN")
+	rr := os.Getenv("RR")
+	regionID := os.Getenv("REGIONID")
+	if regionID == "" {
+		regionID = "cn-hangzhou"
+	}
+	accessKeyID := os.Getenv("ACCESSKEYID")
+	accessSecret := os.Getenv("ACCESSSECRET")
+
+	ip4 := ""
+	for {
+		time.Sleep(10 * time.Second)
+
+		currentIPV4, err := getPublicIP()
+		if err != nil {
+			log.Println("Error getting public IP:", err)
+			continue
+		}
+
+		if currentIPV4 == "" || currentIPV4 == ip4 {
+			continue
+		}
+
+		client, err := alidns.NewClientWithAccessKey(regionID, accessKeyID, accessSecret)
+		if err != nil {
+			log.Println(err.Error())
+			continue
+		}
+
+		drRequest := alidns.CreateDescribeDomainRecordsRequest()
+		drRequest.KeyWord = rr
+		drRequest.DomainName = domain
+		drRequest.TypeKeyWord = "A"
+
+		drResponse, err := client.DescribeDomainRecords(drRequest)
+		if err != nil {
+			log.Println(err)
+			continue
+		}
+		if !drResponse.IsSuccess() {
+			continue
+		}
+
+		rid := ""
+		for _, r := range drResponse.DomainRecords.Record {
+			rid = r.RecordId
+			if r.Value == currentIPV4 {
+				ip4 = currentIPV4
+				rid = ""
+			}
+			break
+		}
+
+		if rid == "" {
+			continue
+		}
+
+		//修改域名对应的IP，修改成功后continue
+		req := alidns.CreateUpdateDomainRecordRequest()
+		req.Scheme = "https"
+		req.RR = rr
+		req.RecordId = rid
+		req.Value = currentIPV4
+		req.Type = "A"
+
+		resp, err := client.UpdateDomainRecord(req)
+		if err != nil {
+			log.Println(err.Error())
+			if !strings.Contains(err.Error(), fmt.Sprintf("not %s", domain)) {
+				continue
+			}
+		}
+
+		if resp.IsSuccess() {
+			ip4 = currentIPV4
+			log.Println("update success: ", ip4)
+			continue
+		}
+
+		//当域名修改失败时判断是否是没有对应的记录，不存在时创建新的域名记录
+		request := alidns.CreateAddDomainRecordRequest()
+		request.Scheme = "https"
+		request.Value = currentIPV4
+		request.Type = "A"
+		request.RR = rr
+		request.DomainName = domain
+		response, err := client.AddDomainRecord(request)
+		if err != nil {
+			fmt.Print(err.Error())
+			continue
+		}
+		if !response.IsSuccess() {
+			fmt.Print(response.GetHttpContentString())
+			ip4 = currentIPV4
+		}
+	}
+}

readme.md

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+# DDNS4
+
+---
+
+
+一、概述
+
+    把当前主机的IPV4向阿里DNS进行注册，实现IPV4 DDNS功能。当二级域名没有创建时会自动创建，解释使用A类型，每10秒检测一次当前主机的IPV4地址，如果发生变化则自动更新到阿里DNS。如果存在多个IPV4地址，则只更新第一个IPV4地址。
+
+二、组件
+
+    github.com/aliyun/alibaba-cloud-sdk-go v1.62.676
+
+三、配置
+
+    1. 阿里云配置RAM访问控制，权限如下: 
+   
+        AliyunDNSFullAccess
+        AliyunHTTPDNSFullAccess
+
+    2. 环境变量
+        DOMAIN 域名
+	    RR 二级域名
+	    REGIONID 地域，默认cn-hangzhou
+        ACCESSKEYID 访问key
+	    ACCESSSECRET 访问私钥
+
+四、 调试
+