forked from skynetservices/skydns
/
main.go
92 lines (82 loc) · 2.68 KB
/
main.go
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// Copyright (c) 2014 The SkyDNS Authors. All rights reserved.
// Use of this source code is governed by The MIT License (MIT) that can be
// found in the LICENSE file.
package main
import (
"flag"
"log"
"os"
"strings"
"time"
"github.com/coreos/go-etcd/etcd"
)
var (
machines = strings.Split(os.Getenv("ETCD_MACHINES"), ",") // list of URLs to etcd
nameservers = strings.Split(os.Getenv("SKYDNS_NAMESERVERS"), ",") // list of nameservers
tlskey = os.Getenv("ETCD_TLSKEY") // TLS private key path
tlspem = os.Getenv("ETCD_TLSPEM") // X509 certificate
config = &Config{ReadTimeout: 0, Domain: "", DnsAddr: "", DNSSEC: ""}
nameserver = ""
machine = ""
)
func init() {
flag.StringVar(&config.Domain, "domain",
func() string {
if x := os.Getenv("SKYDNS_DOMAIN"); x != "" {
return x
}
return "skydns.local."
}(), "domain to anchor requests to (SKYDNS_DOMAIN)")
flag.StringVar(&config.DnsAddr, "addr",
func() string {
if x := os.Getenv("SKYDNS_ADDR"); x != "" {
return x
}
return "127.0.0.1:53"
}(), "ip:port to bind to (SKYDNS_ADDR)")
flag.StringVar(&nameserver, "nameserver", "", "nameserver address(es) to forward (non-local) queries to e.g. 8.8.8.8:53,8.8.4.4:53")
flag.StringVar(&machine, "machines", "http://127.0.0.1:4001", "machine address(es) running etcd")
flag.StringVar(&config.DNSSEC, "dnssec", "", "basename of DNSSEC key file e.q. Kskydns.local.+005+38250")
flag.StringVar(&tlskey, "tls-key", "", "TLS Private Key path")
flag.StringVar(&tlspem, "tls-pem", "", "X509 Certificate")
flag.DurationVar(&config.ReadTimeout, "rtimeout", 2*time.Second, "read timeout")
flag.BoolVar(&config.RoundRobin, "round-robin", true, "round robin A/AAAA replies")
// TTl
// Minttl
flag.StringVar(&config.Hostmaster, "hostmaster", "hostmaster@skydns.local.", "hostmaster email address to use")
}
func newClient() (client *etcd.Client) {
if len(machines) == 1 && machines[0] == "" {
machines[0] = "http://127.0.0.1:4001"
// override if we have a commandline flag as well
if machine != "" {
strings.Split(machine, ",")
}
}
if strings.HasPrefix(machines[0], "https://") {
var err error
if client, err = etcd.NewTLSClient(machines, tlspem, tlskey, ""); err != nil {
log.Fatal(err)
}
} else {
client = etcd.NewClient(machines)
}
client.SyncCluster()
return client
}
func main() {
flag.Parse()
client := newClient()
if nameserver != "" {
config.Nameservers = strings.Split(nameserver, ",")
}
config, err := LoadConfig(client, config)
if err != nil {
log.Fatal(err)
}
s := NewServer(config, client)
statsCollect()
if err := s.Run(); err != nil {
log.Fatal(err)
}
}