From 7ca9f8abdbbb51b566355b83da975f0c24fc8b3a Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Thu, 21 Nov 2024 21:43:07 +0800
Subject: [PATCH] import from UXP: Issue #2652 - Part 1: Add a way to
 programmatically clear the DNS cache. (f5ef3275)

---
 netwerk/dns/ChildDNSService.cpp | 7 +++++++
 netwerk/dns/nsDNSService2.cpp   | 6 ++++++
 netwerk/dns/nsIDNSService.idl   | 5 +++++
 3 files changed, 18 insertions(+)

diff --git a/netwerk/dns/ChildDNSService.cpp b/netwerk/dns/ChildDNSService.cpp
index a3a1f3347..c95c3551f 100644
--- a/netwerk/dns/ChildDNSService.cpp
+++ b/netwerk/dns/ChildDNSService.cpp
@@ -202,6 +202,13 @@ ChildDNSService::GetDNSCacheEntries(nsTArray<mozilla::net::DNSCacheEntries> *arg
   return NS_ERROR_NOT_AVAILABLE;
 }
 
+NS_IMETHODIMP
+ChildDNSService::ClearCache()
+{
+  // Not available in IPC children.
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
 NS_IMETHODIMP
 ChildDNSService::GetMyHostName(nsACString &result)
 {
diff --git a/netwerk/dns/nsDNSService2.cpp b/netwerk/dns/nsDNSService2.cpp
index bdf0615a6..f2d3f7e18 100644
--- a/netwerk/dns/nsDNSService2.cpp
+++ b/netwerk/dns/nsDNSService2.cpp
@@ -1053,6 +1053,12 @@ nsDNSService::GetDNSCacheEntries(nsTArray<mozilla::net::DNSCacheEntries> *args)
     return NS_OK;
 }
 
+NS_IMETHODIMP
+nsDNSService::ClearCache() {
+  mResolver->FlushCache();
+  return NS_OK;
+}
+
 size_t
 nsDNSService::SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const
 {
diff --git a/netwerk/dns/nsIDNSService.idl b/netwerk/dns/nsIDNSService.idl
index 2704790dc..816d01dd6 100644
--- a/netwerk/dns/nsIDNSService.idl
+++ b/netwerk/dns/nsIDNSService.idl
@@ -115,6 +115,11 @@ interface nsIDNSService : nsISupports
      */
     [noscript] void getDNSCacheEntries(in EntriesArray args);
 
+    /**
+     * Clears the DNS cache.
+     */
+    void clearCache();
+
     /**
      * @return the hostname of the operating system.
      */