The recursion resolve can work

README.MD

@@ -14,3 +14,14 @@ Similar as [dnsmasq](http://www.thekelleys.org.uk/dnsmasq/doc.html) ,but support
 
 * Cache records save in memory or redis configurable
 
+
+### Configuration
+
+All the configuration on godns.conf a TOML formating config file.   
+More about Toml :[https://github.com/mojombo/toml](https://github.com/mojombo/toml)
+
+
+
+
+
+

handler.go

@@ -3,6 +3,7 @@ package main
 import (
 	"github.com/miekg/dns"
 	// "log"
+	// "fmt"
 )
 
 type GODNSHandler struct {
@@ -35,13 +36,12 @@ func NewHandler() *GODNSHandler {
 
 func (h *GODNSHandler) do(net string, w dns.ResponseWriter, req *dns.Msg) {
 
-	qname := req.Question[0].Name
-	qtype := req.Question[0].Qtype
-	qclass := req.Question[0].Qclass
+	q := req.Question[0]
+	Q := Question{q.Name, dns.TypeToString[q.Qtype], dns.ClassToString[q.Qclass]}
 
-	Debug("Question:　%s %s %s", qname, dns.ClassToString[qclass], dns.TypeToString[qtype])
+	Debug("Question:　%s", Q.String())
 
-	h.resolver.Lookup(net, req)
+	mesg, err := h.resolver.Lookup(net, req)
 
 }
 
@@ -52,3 +52,13 @@ func (h *GODNSHandler) DoTCP(w dns.ResponseWriter, req *dns.Msg) {
 func (h *GODNSHandler) DoUDP(w dns.ResponseWriter, req *dns.Msg) {
 	h.do("udp", w, req)
 }
+
+type Question struct {
+	qname  string
+	qtype  string
+	qclass string
+}
+
+func (q *Question) String() string {
+	return q.qname + " " + q.qclass + " " + q.qtype
+}

resolver.go

@@ -3,27 +3,49 @@ package main
 import (
 	"fmt"
 	"github.com/miekg/dns"
+	"strings"
 	"time"
 )
 
+type ResolvError struct {
+	qname       string
+	nameservers []string
+}
+
+func (e ResolvError) Error() string {
+	errmsg := fmt.Sprintf("%s resolv failed on %s", e.qname, strings.Join(e.nameservers, "; "))
+	return errmsg
+}
+
 type Resolver struct {
 	config *dns.ClientConfig
 }
 
-func (r *Resolver) Lookup(net string, req *dns.Msg) {
+func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error) {
 	c := &dns.Client{
 		Net:          net,
 		ReadTimeout:  r.Timeout(),
 		WriteTimeout: r.Timeout(),
 	}
 
-	for _, nameserver := range r.Nameservers() {
-		r, rtt, _ := c.Exchange(req, nameserver)
-		fmt.Println(r)
-		fmt.Println(rtt)
+	qname := req.Question[0].Name
 
+	for _, nameserver := range r.Nameservers() {
+		r, rtt, err := c.Exchange(req, nameserver)
+		if err != nil {
+			Debug("%s socket error on %s", qname, nameserver)
+			Debug("error:%s", err.Error())
+			continue
+		}
+		if r != nil && r.Rcode != dns.RcodeSuccess {
+			Debug("%s failed to get an valid answer on %s", qname, nameserver)
+			continue
+		}
+		Debug("%s resolv on %s ttl: %d", qname, nameserver, rtt)
+		return r, nil
 	}
-	// r,rtt,_:c.Exchange(req, a)
+	Debug("%s dns query failed", qname)
+	return nil, ResolvError{qname, r.Nameservers()}
 
 }