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-rw-r--r--dns/main.go54
1 files changed, 54 insertions, 0 deletions
diff --git a/dns/main.go b/dns/main.go
new file mode 100644
index 0000000..b3adfca
--- /dev/null
+++ b/dns/main.go
@@ -0,0 +1,54 @@
+package dns
+
+import (
+ "log"
+ "net"
+
+ "github.com/miekg/dns"
+)
+
+type Dns struct {
+ server dns.Server
+ config *dns.ClientConfig
+}
+
+func (d *Dns) ServeDNS(w dns.ResponseWriter, req *dns.Msg) {
+ var resp *dns.Msg
+ var err error
+ client := new(dns.Client)
+
+ req.RecursionDesired = true;
+ for _, upstream := range d.config.Servers {
+ resp, _, err = client.Exchange(req, net.JoinHostPort(upstream, d.config.Port))
+ if err == nil {
+ break
+ }
+
+ log.Printf("dns query: %s", err)
+ }
+
+ w.WriteMsg(resp)
+}
+
+func New() (*Dns, error) {
+ var d Dns
+ var err error
+
+ d.server = dns.Server{
+ Net: "udp",
+ ReusePort: true,
+ Handler: &d,
+ }
+
+ d.config, err = dns.ClientConfigFromFile("/etc/resolv.conf")
+ if err != nil {
+ log.Printf("reading resolve.conf: %s", err)
+ return nil, err
+ }
+
+ return &d, nil
+}
+
+func (d *Dns) Run() {
+ d.server.ListenAndServe()
+}