forked from yinqiwen/gsnova
/
dns.go
115 lines (105 loc) · 2.28 KB
/
dns.go
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package dns
import (
"context"
"math/rand"
"net"
"github.com/miekg/dns"
"github.com/yinqiwen/fdns"
"github.com/yinqiwen/gotoolkit/cip"
"github.com/wilson818/gsnova/common/logger"
"github.com/wilson818/gsnova/common/netx"
)
var LocalDNS *fdns.TrustedDNS
func pickIP(rr []dns.RR) string {
for _, answer := range rr {
if a, ok := answer.(*dns.A); ok {
return a.A.String()
}
}
for _, answer := range rr {
if aaaa, ok := answer.(*dns.AAAA); ok {
return aaaa.AAAA.String()
}
}
return ""
}
func selectDNSServer(ss []string) string {
var server string
slen := len(ss)
if slen == 1 {
server = ss[0]
} else {
server = ss[rand.Intn(slen)]
}
return server
}
func getIPByDefaultResolver(domain string) (string, error) {
addrs, err := net.DefaultResolver.LookupHost(context.Background(), domain)
if nil == err && len(addrs) > 0 {
return addrs[0], nil
}
return "", err
}
func DnsGetDoaminIP(domain string) (string, error) {
if nil != LocalDNS {
ips, err := LocalDNS.LookupA(domain)
if len(ips) > 0 {
return pickIP(ips), err
}
}
return getIPByDefaultResolver(domain)
}
var CNIPSet *cip.CountryIPSet
type LocalDNSConfig struct {
Listen string
TrustedDNS []string
FastDNS []string
CNIPSet string
}
func Init(conf *LocalDNSConfig) {
cnipset, err := cip.LoadIPSet(conf.CNIPSet, "CN")
if nil != err {
logger.Error("Failed to load IP range file:%s with reason:%v", conf.CNIPSet, err)
} else {
CNIPSet = cnipset
}
cfg := &fdns.Config{}
cfg.Listen = conf.Listen
for _, s := range conf.FastDNS {
ss := fdns.ServerConfig{
Server: s,
Timeout: 500,
MaxResponse: 1,
}
cfg.FastDNS = append(cfg.FastDNS, ss)
}
for _, s := range conf.TrustedDNS {
ss := fdns.ServerConfig{
Server: s,
Timeout: 1000,
MaxResponse: 5,
}
cfg.TrustedDNS = append(cfg.TrustedDNS, ss)
}
cfg.MinTTL = 24 * 3600
cfg.DialTimeout = netx.DialTimeout
cfg.IsCNIP = func(ip net.IP) bool {
if nil == CNIPSet {
return false
}
return CNIPSet.IsInCountry(ip, "CN")
}
cfg.IsDomainPoisioned = func(domain string) int {
//conf.GFWList.Load()
return -1
}
LocalDNS, _ = fdns.NewTrustedDNS(cfg)
if len(conf.Listen) > 0 {
go func() {
err := LocalDNS.Start()
if nil != err {
logger.Error("Failed to start dns server:%v", err)
}
}()
}
}