98 lines
1.9 KiB
Go
98 lines
1.9 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"time"
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)
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type Config struct {
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UpdateURL string `json:"update_url"`
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CheckIntervalSecs int `json:"check_interval_seconds"`
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IPCheckURL string `json:"ip_check_url"`
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}
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func loadConfig(path string) (*Config, error) {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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var cfg Config
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err = json.Unmarshal(data, &cfg)
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if err != nil {
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return nil, err
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}
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return &cfg, nil
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}
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func getPublicIP(ipURL string) (string, error) {
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resp, err := http.Get(ipURL)
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return "", err
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}
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return strings.TrimSpace(string(body)), nil
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}
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func updateDDNS(url string) error {
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resp, err := http.Get(url)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("failed, status code %d", resp.StatusCode)
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}
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return nil
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}
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func main() {
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cfg, err := loadConfig("config.json")
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if err != nil {
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fmt.Println("Failed to load config:", err)
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os.Exit(1)
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}
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//var lastIP string
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lastIP, err := getPublicIP(cfg.IPCheckURL)
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if err != nil {
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fmt.Println("Error getting intial public IP:", err)
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lastIP = ""
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} else {
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fmt.Println(time.Now(), "Starting with current IP:", lastIP)
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}
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ticker := time.NewTicker(time.Duration(cfg.CheckIntervalSecs) * time.Second)
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defer ticker.Stop()
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for {
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ip, err := getPublicIP(cfg.IPCheckURL)
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if err != nil {
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fmt.Println("Error getting public IP:", err)
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} else if ip != lastIP {
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fmt.Println(time.Now(), "IP changed to", ip)
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if err := updateDDNS(cfg.UpdateURL); err != nil {
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fmt.Println("Failed to update DDNS:", err)
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} else {
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fmt.Println(time.Now(), "DDNS updated successfully")
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lastIP = ip
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}
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} else {
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fmt.Println(time.Now(), "IP unchanged:", ip)
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}
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<-ticker.C
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}
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}
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