133 lines
2.5 KiB
Go
133 lines
2.5 KiB
Go
package main
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import (
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_ "embed"
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"fmt"
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"log"
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"strings"
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"sync"
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"time"
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)
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//go:embed title.txt
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var appNameASCII string
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type publicIP struct {
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v4 string
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v6 string
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}
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func getPublicIP() publicIP {
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var publicIP publicIP
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var wg sync.WaitGroup
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if UseIPv4() {
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wg.Add(1)
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go func() {
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publicIP.v4 = GetPublicIP(4)
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wg.Done()
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}()
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}
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if UseIPv6() {
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wg.Add(1)
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go func() {
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publicIP.v6 = GetPublicIP(6)
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wg.Done()
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}()
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}
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wg.Wait()
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return publicIP
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}
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func getDNSRecords() []DNSRecords {
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apiKey := GetAPIKey()
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zoneID := GetZoneID()
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domainNames := GetDomainNames()
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ch := make(chan DNSRecords, len(domainNames))
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defer close(ch)
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for _, domainName := range domainNames {
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go func() {
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ch <- GetDNSRecord(zoneID, domainName, apiKey)
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}()
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}
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var dnsRecords []DNSRecords
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for i := 0; i < len(domainNames); i++ {
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dnsRecord := <-ch
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dnsRecords = append(dnsRecords, dnsRecord)
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}
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return dnsRecords
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}
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func initialize() {
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fmt.Print(appNameASCII)
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var recordType string
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if UseIPv4() && UseIPv6() {
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recordType = "A and AAAA"
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} else if UseIPv4() {
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recordType = "A"
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} else if UseIPv6() {
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recordType = "AAAA"
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}
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domainNames := strings.Join(GetDomainNames(), ", ")
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interval := GetInterval()
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fmt.Printf("Updating %v records of %v every %v minutes\n\n", recordType, domainNames, interval)
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}
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func main() {
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initialize()
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for {
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var publicIP publicIP
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var dnsRecords []DNSRecords
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var wg sync.WaitGroup
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// concurrently fetch public ip and dns records
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wg.Add(2)
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go func() {
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publicIP = getPublicIP()
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wg.Done()
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}()
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go func() {
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dnsRecords = getDNSRecords()
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wg.Done()
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}()
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wg.Wait()
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// concurrently create/update dns entries if their content is not current public ip
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apiKey := GetAPIKey()
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zoneID := GetZoneID()
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for _, dnsRecord := range dnsRecords {
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if UseIPv4() && publicIP.v4 != dnsRecord.a.content {
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wg.Add(1)
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go func() {
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UpdateDNSRecord(zoneID, dnsRecord.a.id, apiKey, DNSRecordBody{Type: "A", Name: dnsRecord.name, Content: publicIP.v4})
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log.Printf("Set DNS A record %v to %v", dnsRecord.name, publicIP.v4)
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wg.Done()
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}()
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}
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if UseIPv6() && publicIP.v6 != dnsRecord.aaaa.content {
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wg.Add(1)
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go func() {
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UpdateDNSRecord(zoneID, dnsRecord.aaaa.id, apiKey, DNSRecordBody{Type: "AAAA", Name: dnsRecord.name, Content: publicIP.v6})
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log.Printf("Set DNS AAAA record %v to %v", dnsRecord.name, publicIP.v6)
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wg.Done()
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}()
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}
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}
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wg.Wait()
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time.Sleep(time.Duration(GetInterval()) * time.Minute)
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}
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}
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