make backwards compatible for go <= 1.8

1 files changed, 1 insertions, 30 deletions

diff --git a/srv.go b/srv.go
index 6c1fe80..bd5ca1c 100644
--- a/srv.go
+++ b/srv.go
@@ -1,11 +1,8 @@
 package dnsutils
 
 import (
-	"context"
-	"fmt"
 	"math/rand"
 	"net"
-	"os"
 	"sort"
 )
 
@@ -21,19 +18,8 @@ import (
 //   // Do something such as dial this SRV. If fails move on the the next or break if it succeeds.
 //   i += 1
 // }
-//
-// To override the operating system's name server set the DNSUTILS_OVERRIDE_NS environment variable.
-// The override should also include the port. For example 127.0.0.1:53
 func OrderedSRV(service, proto, name string) (int, map[int]*net.SRV, error) {
-	var addrs []*net.SRV
-	var err error
-	ns := os.Getenv("DNSUTILS_OVERRIDE_NS")
-	if ns != "" {
-		res := net.Resolver{Dial: overrideNS}
-		_, addrs, err = res.LookupSRV(context.Background(), service, proto, name)
-	} else {
-		_, addrs, err = net.LookupSRV(service, proto, name)
-	}
+	_, addrs, err := net.LookupSRV(service, proto, name)
 	if err != nil {
 		return 0, make(map[int]*net.SRV), err
 	}
@@ -41,21 +27,6 @@ func OrderedSRV(service, proto, name string) (int, map[int]*net.SRV, error) {
 	return index, osrv, nil
 }
 
-func overrideNS(ctx context.Context, network, address string) (conn net.Conn, err error) {
-	// Ignore the address provided and override with an environment variable if it is defined
-	ns := os.Getenv("DNSUTILS_OVERRIDE_NS")
-	if ns != "" {
-		address = ns
-	}
-	if network == "tcp" || network == "udp" {
-		var d net.Dialer
-		conn, err = d.DialContext(ctx, network, address)
-		return
-	}
-	err = fmt.Errorf("unsupported network protocol %s for DNS lookup", network)
-	return
-}
-
 func orderSRV(addrs []*net.SRV) (int, map[int]*net.SRV) {
 	// Initialise the ordered map
 	var o int