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| # main.go
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"path"
"strings"
"time"
"github.com/aliyun/alibaba-cloud-sdk-go/services/ecs"
)
type ConfigurationModel struct {
ACCESS_KEY_ID string
ACCESS_KEY_SECRET string
REGION_ID string
SECURITY_GROUP_ID string
IP_PROTOCOL string
PORT_RANGE string
DESCRIPTION string
DURATION int
}
type IpResponse struct {
Origin string `json:"origin"`
}
var configModel ConfigurationModel
const GetPublicIpUrl = "http://www.httpbin.org/ip"
func main() {
loadConfig()
fmt.Println("配置：", configModel.SECURITY_GROUP_ID)
filename := configModel.SECURITY_GROUP_ID + "_ip.txt"
oldIp := readIp(filename)
fmt.Printf("最后IP记录为: %s\n", oldIp)
ecsClient, err := ecs.NewClientWithAccessKey(configModel.REGION_ID, configModel.ACCESS_KEY_ID, configModel.ACCESS_KEY_SECRET)
if err != nil {
panic(err)
}
for {
newIp := getPublicIp()
if oldIp != newIp {
fmt.Printf("IP变更: %s => %s\n", oldIp, newIp)
delSecurityGroup(ecsClient, configModel, oldIp)
addSecurityGroup(ecsClient, configModel, newIp)
oldIp = newIp
writeIp(filename, newIp)
}
time.Sleep(time.Duration(configModel.DURATION) * time.Second)
}
}
func loadConfig() {
var configFile string
dir, _ := os.Getwd()
configFile = path.Join(dir, "settings.json")
f, err := os.Open(configFile)
if err != nil {
log.Fatalf("无法打开文件：%s", err)
os.Exit(-1)
}
defer f.Close()
data, _ := ioutil.ReadAll(f)
if err := json.Unmarshal(data, &configModel); err != nil {
log.Fatalf("数据反序列化失败：%s", err)
os.Exit(-1)
}
}
func getPublicIp() string {
resp, err := http.Get(GetPublicIpUrl)
if err != nil {
log.Printf("获取公网 IP 出现错误，错误信息：%s", err)
os.Exit(-1)
}
defer resp.Body.Close()
bytes, _ := ioutil.ReadAll(resp.Body)
var res IpResponse
if err := json.Unmarshal(bytes, &res); err != nil {
log.Fatalf("数据反序列化失败：%s", err)
os.Exit(-1)
}
return res.Origin
}
func delSecurityGroup(client *ecs.Client, configModel ConfigurationModel, ip string) {
request := ecs.CreateRevokeSecurityGroupRequest()
request.SecurityGroupId = configModel.SECURITY_GROUP_ID
request.PortRange = configModel.PORT_RANGE
request.IpProtocol = configModel.IP_PROTOCOL
request.SourceCidrIp = ip
response, err := client.RevokeSecurityGroup(request)
if err != nil {
panic(err)
}
fmt.Printf("删除安全组成功: (%d)! %s\n", response.GetHttpStatus(), ip)
}
func addSecurityGroup(client *ecs.Client, configModel ConfigurationModel, ip string) {
request := ecs.CreateAuthorizeSecurityGroupRequest()
request.SecurityGroupId = configModel.SECURITY_GROUP_ID
request.PortRange = configModel.PORT_RANGE
request.IpProtocol = configModel.IP_PROTOCOL
request.Description = configModel.DESCRIPTION
request.SourceCidrIp = ip
response, err := client.AuthorizeSecurityGroup(request)
if err != nil {
panic(err)
}
fmt.Printf("添加安全组成功: (%d)! %s\n", response.GetHttpStatus(), ip)
}
func readIp(filename string) string {
ip := "127.0.0.1"
contents, err := ioutil.ReadFile(filename)
if err == nil {
ip = strings.Replace(string(contents), "\n", "", 1)
}
return ip
}
func writeIp(filename string, content string) {
data := []byte(content)
ioutil.WriteFile(filename, data, 0644)
}
|