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Feature: Round Robin DNS #31

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Feature: Round Robin DNS #31

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5e2d13a
Feature: Round Robin DNS
Opensourcecommunitydevelopment Jul 31, 2017
cf98566
Update dingo.go
Opensourcecommunitydevelopment Aug 2, 2017
89bd173
Update dingo.go
Opensourcecommunitydevelopment Aug 2, 2017
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16 changes: 16 additions & 0 deletions dingo.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ import "github.com/miekg/dns"
import "time"
import "github.com/patrickmn/go-cache"
import "math/rand"
import "reflect"

/**********************************************************************/

Expand Down Expand Up @@ -123,6 +124,11 @@ func handle(buf []byte, addr *net.UDPAddr, uc *net.UDPConn) {
rmsg.RecursionAvailable = r.RA
rmsg.AuthenticatedData = r.AD
rmsg.CheckingDisabled = r.CD

// Round Robin DNS https://en.wikipedia.org/wiki/Round-robin_DNS
if len(r.Answer) >= 2 {
Shuffle(r.Answer)
}

for _,grr := range r.Answer { rmsg.Answer = append(rmsg.Answer, getrr(grr)) }
for _,grr := range r.Authority { rmsg.Ns = append(rmsg.Ns, getrr(grr)) }
Expand Down Expand Up @@ -156,6 +162,16 @@ func resolve(name string, qtype int) Reply {
return <-rchan
}

func Shuffle(slice interface{}) {
rv := reflect.ValueOf(slice)
swap := reflect.Swapper(slice)
length := rv.Len()
for i := length - 1; i > 0; i-- {
j := rand.Intn(i + 1)
swap(i, j)
}
}

/* main */
func main() {
rand.Seed(time.Now().UnixNano())
Expand Down