fix redundant WindowsDNS (#1456)

Larvan2 · Larvan2 · commit a6856ebd9b06 · 2024-08-20T21:01:47.000+08:00
Co-authored-by: ForestL&lt;45709305+forestl18@users.noreply.github.com&gt;
diff --git a/dns/system_windows.go b/dns/system_windows.go
@@ -8,6 +8,7 @@ import (
 	"syscall"
 	"unsafe"
 
+	"golang.org/x/exp/slices"
 	"golang.org/x/sys/windows"
 )
 
@@ -40,6 +41,9 @@ func dnsReadConfig() (servers []string, err error) {
 				// Unexpected type.
 				continue
 			}
+			if slices.Contains(servers, ip.String()) {
+				continue
+			}
 			servers = append(servers, ip.String())
 		}
 	}

Original file line number	Diff line number	Diff line change
`@@ -8,6 +8,7 @@ import (`
`8`	`8`	`"syscall"`
`9`	`9`	`"unsafe"`
`10`	`10`
	`11`	`+ "golang.org/x/exp/slices"`
`11`	`12`	`"golang.org/x/sys/windows"`
`12`	`13`	`)`
`13`	`14`
`@@ -40,6 +41,9 @@ func dnsReadConfig() (servers []string, err error) {`
`40`	`41`	`// Unexpected type.`
`41`	`42`	`continue`
`42`	`43`	`}`
	`44`	`+ if slices.Contains(servers, ip.String()) {`
	`45`	`+ continue`
	`46`	`+ }`
`43`	`47`	`servers = append(servers, ip.String())`
`44`	`48`	`}`
`45`	`49`	`}`