dns: add function to get list of system name servers

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/dns/funcs.go b/lib/dns/funcs.go
new file mode 100644
index 00000000..e2ab2468
--- /dev/null
+++ b/lib/dns/funcs.go
@@ -0,0 +1,26 @@
+// Copyright 2019, Shulhan <ms@kilabit.info>. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package dns
+
+import (
+	libnet "github.com/shuLhan/share/lib/net"
+)
+
+//
+// GetSystemNameServers return list of system name servers by reading
+// resolv.conf formatted file in path.
+//
+// Default path is "/etc/resolv.conf".
+//
+func GetSystemNameServers(path string) []string {
+	if len(path) == 0 {
+		path = "/etc/resolv.conf"
+	}
+	rc, err := libnet.NewResolvConf(path)
+	if err != nil {
+		return nil
+	}
+	return rc.NameServers
+}