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package main
/*
Copyright 2012-2015 Ask Bjørn Hansen
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import (
"flag"
"fmt"
"log"
"net"
"os"
"os/signal"
"path/filepath"
"runtime"
"runtime/pprof"
"strings"
"time"
"github.com/abh/geodns/applog"
"github.com/abh/geodns/health"
"github.com/abh/geodns/monitor"
"github.com/abh/geodns/querylog"
"github.com/abh/geodns/server"
"github.com/abh/geodns/targeting"
"github.com/abh/geodns/targeting/geoip2"
"github.com/abh/geodns/zones"
"github.com/pborman/uuid"
)
// VERSION is the current version of GeoDNS
var VERSION string = "3.0.2"
var buildTime string
var gitVersion string
// Set development with the 'devel' build flag to load
// templates from disk instead of from the binary.
var development bool
var (
serverInfo *monitor.ServerInfo
)
var (
flagconfig = flag.String("config", "./dns/", "directory of zone files")
flagconfigfile = flag.String("configfile", "geodns.conf", "filename of config file (in 'config' directory)")
flagcheckconfig = flag.Bool("checkconfig", false, "check configuration and exit")
flagidentifier = flag.String("identifier", "", "identifier (hostname, pop name or similar)")
flaginter = flag.String("interface", "*", "set the listener address")
flagport = flag.String("port", "53", "default port number")
flaghttp = flag.String("http", ":8053", "http listen address (:8053)")
flaglog = flag.Bool("log", false, "be more verbose")
flagcpus = flag.Int("cpus", 1, "Set the maximum number of CPUs to use")
flagLogFile = flag.String("logfile", "", "log to file")
flagPrivateDebug = flag.Bool("privatedebug", false, "Make debugging queries accepted only on loopback")
flagShowVersion = flag.Bool("version", false, "Show GeoDNS version")
cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
memprofile = flag.String("memprofile", "", "write memory profile to this file")
)
func init() {
if len(gitVersion) > 0 {
VERSION = VERSION + "/" + gitVersion
}
log.SetPrefix("geodns ")
log.SetFlags(log.Lmicroseconds | log.Lshortfile)
serverInfo = &monitor.ServerInfo{}
serverInfo.Version = VERSION
serverInfo.UUID = uuid.New()
serverInfo.Started = time.Now()
}
func main() {
flag.Parse()
if *memprofile != "" {
runtime.MemProfileRate = 1024
}
if *flagShowVersion {
extra := []string{}
if len(buildTime) > 0 {
extra = append(extra, buildTime)
}
extra = append(extra, runtime.Version())
fmt.Printf("geodns %s (%s)\n", VERSION, strings.Join(extra, ", "))
os.Exit(0)
}
if *flaglog {
applog.Enabled = true
}
if len(*flagLogFile) > 0 {
applog.FileOpen(*flagLogFile)
}
if len(*flagidentifier) > 0 {
ids := strings.Split(*flagidentifier, ",")
serverInfo.ID = ids[0]
if len(ids) > 1 {
serverInfo.Groups = ids[1:]
}
}
var configFileName string
if filepath.IsAbs(*flagconfigfile) {
configFileName = *flagconfigfile
} else {
configFileName = filepath.Clean(filepath.Join(*flagconfig, *flagconfigfile))
}
if *flagcheckconfig {
err := configReader(configFileName)
if err != nil {
log.Println("Errors reading config", err)
os.Exit(2)
}
dirName := *flagconfig
_, err = zones.NewMuxManager(dirName, &zones.NilReg{})
if err != nil {
log.Println("Errors reading zones", err)
os.Exit(2)
}
// todo: setup health stuff when configured
return
}
if *flagcpus == 0 {
runtime.GOMAXPROCS(runtime.NumCPU())
} else {
runtime.GOMAXPROCS(*flagcpus)
}
log.Printf("Starting geodns %s (%s)\n", VERSION, runtime.Version())
if *cpuprofile != "" {
prof, err := os.Create(*cpuprofile)
if err != nil {
panic(err.Error())
}
pprof.StartCPUProfile(prof)
defer func() {
log.Println("closing file")
prof.Close()
}()
defer func() {
log.Println("stopping profile")
pprof.StopCPUProfile()
}()
}
// load geodns.conf config
configReader(configFileName)
if len(Config.Health.Directory) > 0 {
go health.DirectoryReader(Config.Health.Directory)
}
// load (and re-load) zone data
go configWatcher(configFileName)
if *flaginter == "*" {
addrs, _ := net.InterfaceAddrs()
ips := make([]string, 0)
for _, addr := range addrs {
ip, _, err := net.ParseCIDR(addr.String())
if err != nil {
continue
}
if !(ip.IsLoopback() || ip.IsGlobalUnicast()) {
continue
}
ips = append(ips, ip.String())
}
*flaginter = strings.Join(ips, ",")
}
inter := getInterfaces()
if Config.HasStatHat() {
log.Println("StatHat integration has been removed in favor of more generic metrics")
}
if len(Config.GeoIPDirectory()) > 0 {
geoProvider, err := geoip2.New(Config.GeoIPDirectory())
if err != nil {
log.Printf("Configuring geo provider: %s", err)
}
if geoProvider != nil {
targeting.Setup(geoProvider)
}
}
srv := server.NewServer(serverInfo)
if qlc := Config.QueryLog; len(qlc.Path) > 0 {
ql, err := querylog.NewFileLogger(qlc.Path, qlc.MaxSize, qlc.Keep)
if err != nil {
log.Fatalf("Could not start file query logger: %s", err)
}
srv.SetQueryLogger(ql)
}
muxm, err := zones.NewMuxManager(*flagconfig, srv)
if err != nil {
log.Printf("error loading zones: %s", err)
}
go muxm.Run()
for _, host := range inter {
go srv.ListenAndServe(host)
}
if len(*flaghttp) > 0 {
go func() {
hs := NewHTTPServer(muxm, serverInfo)
hs.Run(*flaghttp)
}()
}
terminate := make(chan os.Signal)
signal.Notify(terminate, os.Interrupt)
<-terminate
log.Printf("geodns: signal received, stopping")
if *memprofile != "" {
f, err := os.Create(*memprofile)
if err != nil {
log.Fatal(err)
}
pprof.WriteHeapProfile(f)
f.Close()
}
applog.FileClose()
}
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