From d7864f134ed3f3d746935b2ff0f84bab4bfe7268 Mon Sep 17 00:00:00 2001
From: eronez <55025357+eronez@users.noreply.github.com>
Date: Wed, 11 Feb 2026 06:54:47 +0000
Subject: [PATCH] Add unsetSearchDomainForSystemdResolved

Add `unsetSearchDomainForSystemdResolved` to revert dns setting before `unsetAddresses` while closing TUN.
---
 tun_linux.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tun_linux.go b/tun_linux.go
index f35921e..ffaea20 100644
--- a/tun_linux.go
+++ b/tun_linux.go
@@ -325,6 +325,7 @@ func (t *NativeTun) Close() error {
 	if t.options.EXP_ExternalConfiguration {
 		return common.Close(common.PtrOrNil(t.tunFile))
 	}
+	t.unsetSearchDomainForSystemdResolved()
 	t.unsetAddresses()
 	return E.Errors(t.unsetRoute(), t.unsetRules(), common.Close(common.PtrOrNil(t.tunFile)))
 }
@@ -1094,3 +1095,17 @@ func (t *NativeTun) setSearchDomainForSystemdResolved() {
 		_ = shell.Exec(ctlPath, append([]string{"dns", t.options.Name}, common.Map(dnsServer, netip.Addr.String)...)...).Run()
 	}()
 }
+
+func (t *NativeTun) unsetSearchDomainForSystemdResolved() {
+    if t.options.EXP_DisableDNSHijack {
+        return
+    }
+    ctlPath, err := exec.LookPath("resolvectl")
+    if err != nil {
+        return
+    }
+    _ = shell.Exec(ctlPath, "revert", t.options.Name).Run()
+    if t.options.Logger != nil {
+        t.options.Logger.Debug("cleaned up DNS configuration for interface: ", t.options.Name)
+    }
+}