Make ddns behave more standard conform, like SOA records
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7dbcc66298
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c3641cfdda
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@ -50,11 +50,11 @@ host.
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$ sudo vim /etc/powerdns/pdns.d/pipe.conf
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`pipe.conf` should have the following content. Please adjust the path of `ddns`
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and the supplied domain name `--domain=sub.example.com`:
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and the values supplied to `--domain` and `--soa_fqdn`:
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launch=pipe
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pipebackend-abi-version=1
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pipe-command=/home/user/gocode/bin/ddns --domain=sub.example.com backend
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pipe-command=/home/user/gocode/bin/ddns --soa_fqdn=dns.example.com --domain=sub.example.com backend
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Then restart `pdns`:
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81
backend.go
81
backend.go
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@ -5,60 +5,95 @@ import (
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"fmt"
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"os"
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"strings"
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"time"
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)
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type responder func()
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func respondWithFAIL() {
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fmt.Printf("FAIL\n")
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}
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func respondWithEND() {
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fmt.Printf("END\n")
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}
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// This function implements the PowerDNS-Pipe-Backend protocol and generates
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// the response data it possible
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func RunBackend(conn *RedisConnection) {
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bio := bufio.NewReader(os.Stdin)
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// handshake with PowerDNS
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_, _, _ = bio.ReadLine()
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fmt.Printf("OK\tDDNS Go Backend\n")
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bio := bufio.NewReader(os.Stdin)
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for {
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line, _, err := bio.ReadLine()
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if err != nil {
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respondWithFAIL()
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continue
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}
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HandleErr(err)
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HandleRequest(string(line), conn)
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HandleRequest(string(line), conn)()
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}
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}
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func HandleRequest(line string, conn *RedisConnection) {
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defer fmt.Printf("END\n")
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func HandleRequest(line string, conn *RedisConnection) responder {
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if Verbose {
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fmt.Printf("LOG\t'%s'\n", line)
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}
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parts := strings.Split(line, "\t")
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if len(parts) != 6 {
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return
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return respondWithFAIL
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}
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query_name := parts[1]
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query_class := parts[2]
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// query_type := parts[3] // TODO Handle SOA Requests
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query_type := parts[3]
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query_id := parts[4]
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// get the host part of the fqdn
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// pi.d.example.org -> pi
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hostname := ""
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if strings.HasSuffix(query_name, DdnsDomain) {
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hostname = query_name[:len(query_name)-len(DdnsDomain)]
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}
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var response, record string
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record = query_type
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if hostname == "" || !conn.HostExist(hostname) {
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return
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}
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switch query_type {
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case "SOA":
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response = fmt.Sprintf("%s. hostmaster.example.com. %d 1800 3600 7200 5",
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DdnsSoaFqdn, getSoaSerial())
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host := conn.GetHost(hostname)
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case "NS":
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response = DdnsSoaFqdn
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record := "A"
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if !host.IsIPv4() {
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record = "AAAA"
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case "A":
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case "ANY":
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// get the host part of the fqdn: pi.d.example.org -> pi
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hostname := ""
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if strings.HasSuffix(query_name, DdnsDomain) {
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hostname = query_name[:len(query_name)-len(DdnsDomain)]
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}
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if hostname == "" || !conn.HostExist(hostname) {
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return respondWithFAIL
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}
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host := conn.GetHost(hostname)
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response = host.Ip
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record = "A"
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if !host.IsIPv4() {
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record = "AAAA"
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}
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default:
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return respondWithFAIL
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}
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fmt.Printf("DATA\t%s\t%s\t%s\t10\t%s\t%s\n",
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query_name, query_class, record, query_id, host.Ip)
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query_name, query_class, record, query_id, response)
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return respondWithEND
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}
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func getSoaSerial() int64 {
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// return current time in milliseconds
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return time.Now().UnixNano()
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}
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23
ddns.go
23
ddns.go
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@ -12,10 +12,16 @@ func HandleErr(err error) {
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}
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}
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const (
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CmdBackend string = "backend"
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CmdWeb string = "web"
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)
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var (
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DdnsDomain string
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DdnsWebListenSocket string
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DdnsRedisHost string
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DdnsSoaFqdn string
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Verbose bool
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)
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@ -29,28 +35,37 @@ func init() {
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flag.StringVar(&DdnsRedisHost, "redis", ":6379",
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"The Redis socket that should be used")
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flag.StringVar(&DdnsSoaFqdn, "soa_fqdn", "",
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"The FQDN of the DNS server which is returned as a SOA record")
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flag.BoolVar(&Verbose, "verbose", false,
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"Be more verbose")
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}
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func ValidateCommandArgs() {
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func ValidateCommandArgs(cmd string) {
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if DdnsDomain == "" {
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log.Fatal("You have to supply the domain via --domain=DOMAIN")
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} else if !strings.HasPrefix(DdnsDomain, ".") {
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// get the domain in the right format
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DdnsDomain = "." + DdnsDomain
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}
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if cmd == CmdBackend {
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if DdnsSoaFqdn == "" {
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log.Fatal("You have to supply the server FQDN via --soa_fqdn=FQDN")
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}
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}
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}
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func PrepareForExecution() string {
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flag.Parse()
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ValidateCommandArgs()
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if len(flag.Args()) != 1 {
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usage()
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}
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cmd := flag.Args()[0]
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ValidateCommandArgs(cmd)
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return cmd
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}
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@ -61,10 +76,10 @@ func main() {
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defer conn.Close()
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switch cmd {
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case "backend":
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case CmdBackend:
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log.Printf("Starting PDNS Backend\n")
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RunBackend(conn)
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case "web":
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case CmdWeb:
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log.Printf("Starting Web Service\n")
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RunWebService(conn)
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default:
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