From 6c4ae75562fe9f7e3323e6c018f1157308faaae8 Mon Sep 17 00:00:00 2001
From: lsy1990 <lsy1990@sina.com>
Date: Tue, 26 Jul 2022 16:05:55 +0800
Subject: [PATCH] add variable auto_detect_local_dns_server

---
 conf/input.dns_query/dns_query.toml |  2 +-
 inputs/dns_query/dns_query.go       | 31 ++++++++++++++---------------
 2 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/conf/input.dns_query/dns_query.toml b/conf/input.dns_query/dns_query.toml
index d6fb555..ee5f5bf 100644
--- a/conf/input.dns_query/dns_query.toml
+++ b/conf/input.dns_query/dns_query.toml
@@ -9,7 +9,7 @@
 # interval_times = 1
 
 # # 
-enable = false
+auto_detect_local_dns_server  = false
 
 ## servers to query
 # servers = ["8.8.8.8"]
diff --git a/inputs/dns_query/dns_query.go b/inputs/dns_query/dns_query.go
index 714bed1..4443b05 100644
--- a/inputs/dns_query/dns_query.go
+++ b/inputs/dns_query/dns_query.go
@@ -49,7 +49,7 @@ func (dq *DnsQuery) GetInstances() []inputs.Instance {
 type Instance struct {
 	config.InstanceConfig
 
-	Enable bool `toml:"enable"`
+	EnableAutoDetectDnsServer bool `toml:"auto_detect_local_dns_server"`
 	// Domains or subdomains to query
 	Domains []string `toml:"domains"`
 
@@ -70,23 +70,22 @@ type Instance struct {
 }
 
 func (ins *Instance) Init() error {
-	if ins.Enable == false {
-		return nil
+	if ins.EnableAutoDetectDnsServer == true {
+		if len(ins.Servers) == 0 {
+			resolvPath := "/etc/resolv.conf"
+			if _, err := os.Stat(resolvPath); os.IsNotExist(err) {
+				return nil
+			}
+			config, _ := dns.ClientConfigFromFile(resolvPath)
+			Servers := []string{}
+			for _, ipAddress := range config.Servers {
+				Servers = append(Servers, ipAddress)
+			}
+			ins.Servers = Servers
+		}
 	}
 	if len(ins.Servers) == 0 {
-		resolvPath := "/etc/resolv.conf"
-		if _, err := os.Stat(resolvPath); os.IsNotExist(err) {
-			return nil
-		}
-		config, _ := dns.ClientConfigFromFile(resolvPath)
-		Servers := []string{}
-		for _, ipAddress := range config.Servers {
-			Servers = append(Servers, ipAddress)
-		}
-		ins.Servers = Servers
-		if len(ins.Servers) == 0 {
-			return nil
-		}
+		return nil
 	}
 
 	if ins.Network == "" {