From cfba6f692e6cd1fcdb209e0bbc4a905cf3366542 Mon Sep 17 00:00:00 2001
From: lsy1990 <lsy1990@sina.com>
Date: Tue, 26 Jul 2022 10:45:26 +0800
Subject: [PATCH 1/2] supply default dns server

---
 conf/input.dns_query/dns_query.toml |  3 +++
 inputs/dns_query/dns_query.go       | 19 ++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/conf/input.dns_query/dns_query.toml b/conf/input.dns_query/dns_query.toml
index 825d8c1..d6fb555 100644
--- a/conf/input.dns_query/dns_query.toml
+++ b/conf/input.dns_query/dns_query.toml
@@ -8,6 +8,9 @@
 # # interval = global.interval * interval_times
 # interval_times = 1
 
+# # 
+enable = false
+
 ## servers to query
 # servers = ["8.8.8.8"]
 servers = []
diff --git a/inputs/dns_query/dns_query.go b/inputs/dns_query/dns_query.go
index d02a8b1..714bed1 100644
--- a/inputs/dns_query/dns_query.go
+++ b/inputs/dns_query/dns_query.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"os"
 	"strconv"
 	"sync"
 	"time"
@@ -48,6 +49,7 @@ func (dq *DnsQuery) GetInstances() []inputs.Instance {
 type Instance struct {
 	config.InstanceConfig
 
+	Enable bool `toml:"enable"`
 	// Domains or subdomains to query
 	Domains []string `toml:"domains"`
 
@@ -68,8 +70,23 @@ type Instance struct {
 }
 
 func (ins *Instance) Init() error {
+	if ins.Enable == false {
+		return nil
+	}
 	if len(ins.Servers) == 0 {
-		return types.ErrInstancesEmpty
+		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
+		}
 	}
 
 	if ins.Network == "" {

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 2/2] 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 == "" {