mirror of
https://github.com/taigrr/godns
synced 2025-01-18 04:03:25 -08:00
95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package duck
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import (
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"fmt"
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"io/ioutil"
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"log"
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"runtime/debug"
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"strings"
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"time"
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"github.com/TimothyYe/godns"
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)
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var (
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// DuckUrl the API address for Duck DNS
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DuckUrl = "https://www.duckdns.org/update?domains=%s&token=%s&%s"
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)
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// Handler struct
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type Handler struct {
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Configuration *godns.Settings
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}
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// SetConfiguration pass dns settings and store it to handler instance
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func (handler *Handler) SetConfiguration(conf *godns.Settings) {
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handler.Configuration = conf
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}
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// DomainLoop the main logic loop
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func (handler *Handler) DomainLoop(domain *godns.Domain, panicChan chan<- godns.Domain) {
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defer func() {
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if err := recover(); err != nil {
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log.Printf("Recovered in %v: %v\n", err, debug.Stack())
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panicChan <- *domain
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}
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}()
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for {
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currentIP, err := godns.GetCurrentIP(handler.Configuration)
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if err != nil {
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log.Println("get_currentIP:", err)
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continue
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}
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log.Println("currentIP is:", currentIP)
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//check against locally cached IP, if no change, skip update
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client := godns.GetHttpClient(handler.Configuration)
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var ip string
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if strings.ToUpper(handler.Configuration.IPType) == godns.IPV4 {
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ip = fmt.Sprintf("ip=%s", currentIP)
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} else if strings.ToUpper(handler.Configuration.IPType) == godns.IPV6 {
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ip = fmt.Sprintf("ipv6=%s", currentIP)
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}
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for _, subDomain := range domain.SubDomains {
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hostname := subDomain + "." + domain.DomainName
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lastIP := godns.ResolveDNS(hostname, handler.Configuration.Resolver, handler.Configuration.IPType)
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//check against currently known IP, if no change, skip update
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if currentIP == lastIP {
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log.Printf("IP is the same as cached one. Skip update.\n")
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} else {
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// update IP with HTTP GET request
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resp, err := client.Get(fmt.Sprintf(DuckUrl, subDomain, handler.Configuration.LoginToken, ip))
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if err != nil {
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// handle error
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log.Print("Failed to update sub domain:", subDomain)
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continue
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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 || string(body) != "OK" {
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log.Println("Failed to update the IP")
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continue
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} else {
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log.Print("IP updated to:", currentIP)
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}
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// Send notification
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if err := godns.SendNotify(handler.Configuration, fmt.Sprintf("%s.%s", subDomain, domain.DomainName), currentIP); err != nil {
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log.Println("Failed to send notification")
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}
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}
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}
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// Sleep with interval
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log.Printf("Going to sleep, will start next checking in %d seconds...\r\n", handler.Configuration.Interval)
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time.Sleep(time.Second * time.Duration(handler.Configuration.Interval))
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}
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}
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