forked from skynetservices/skydns1
/
main.go
110 lines (96 loc) · 3.33 KB
/
main.go
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// Copyright (c) 2013 Erik St. Martin, Brian Ketelsen. 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"
"github.com/goraft/raft"
"github.com/miekg/dns"
"github.com/rcrowley/go-metrics"
"github.com/rcrowley/go-metrics/stathat"
"github.com/skynetservices/skydns/server"
"log"
"net"
"os"
"strings"
"time"
)
var (
join, ldns, lhttp, dataDir, domain string
rtimeout, wtimeout time.Duration
discover bool
metricsToStdErr bool
graphiteServer, stathatUser string
secret string
nameserver string
)
func init() {
flag.StringVar(&join, "join", "", "Member of SkyDNS cluster to join can be comma separated list")
flag.BoolVar(&discover, "discover", false, "Auto discover SkyDNS cluster. Performs an NS lookup on the -domain to find SkyDNS members")
flag.StringVar(&domain, "domain", "skydns.local", "Domain to anchor requests to")
flag.StringVar(&ldns, "dns", "127.0.0.1:53", "IP:Port to bind to for DNS")
flag.StringVar(&lhttp, "http", "127.0.0.1:8080", "IP:Port to bind to for HTTP")
flag.StringVar(&dataDir, "data", "./data", "SkyDNS data directory")
flag.DurationVar(&rtimeout, "rtimeout", 2*time.Second, "Read timeout")
flag.DurationVar(&wtimeout, "wtimeout", 2*time.Second, "Write timeout")
flag.BoolVar(&metricsToStdErr, "metricsToStdErr", false, "Write metrics to stderr periodically")
flag.StringVar(&graphiteServer, "graphiteServer", "", "Graphite Server connection string e.g. 127.0.0.1:2003")
flag.StringVar(&stathatUser, "stathatUser", "", "StatHat account for metrics")
flag.StringVar(&secret, "secret", "", "Shared secret for use with http api")
flag.StringVar(&nameserver, "nameserver", "", "Nameserver address to forward (non-local) queries to e.g. 8.8.8.8:53,8.8.4.4:53")
}
func main() {
members := make([]string, 0)
raft.SetLogLevel(0)
flag.Parse()
nameservers := strings.Split(nameserver, ",")
// empty argument given
if len(nameservers) == 1 && nameservers[0] == "" {
nameservers = make([]string, 0)
config, err := dns.ClientConfigFromFile("/etc/resolv.conf")
if err == nil {
for _, s := range config.Servers {
nameservers = append(nameservers, net.JoinHostPort(s, config.Port))
}
} else {
log.Fatal(err)
return
}
}
if discover {
ns, err := net.LookupNS(domain)
if err != nil {
log.Fatal(err)
return
}
if len(ns) < 1 {
log.Fatal("No NS records found for ", domain)
return
}
for _, n := range ns {
members = append(members, strings.TrimPrefix(n.Host, "."))
}
} else if join != "" {
members = strings.Split(join, ",")
}
s := server.NewServer(members, domain, ldns, lhttp, dataDir, rtimeout, wtimeout, secret, nameservers)
// Set up metrics if specified on the command line
if metricsToStdErr {
go metrics.Log(metrics.DefaultRegistry, 60e9, log.New(os.Stderr, "metrics: ", log.Lmicroseconds))
}
if len(graphiteServer) > 1 {
addr, err := net.ResolveTCPAddr("tcp", graphiteServer)
if err != nil {
go metrics.Graphite(metrics.DefaultRegistry, 10e9, "skydns", addr)
}
}
if len(stathatUser) > 1 {
go stathat.Stathat(metrics.DefaultRegistry, 10e9, stathatUser)
}
waiter, err := s.Start()
if err != nil {
log.Fatal(err)
return
}
waiter.Wait()
}