net: recognize bare IPv6 loopback addresses in isLoopback

Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/63619
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/net.js

@@ -94,7 +94,9 @@ function isLoopback(host) {
     hostLower === 'localhost' ||
     hostLower.startsWith('127.') ||
     hostLower === '[::1]' ||
-    hostLower === '[0:0:0:0:0:0:0:1]'
+    hostLower === '::1' ||
+    hostLower === '[0:0:0:0:0:0:0:1]' ||
+    hostLower === '0:0:0:0:0:0:0:1'
   );
 }
 

test/parallel/test-internal-net-isLoopback.js

@@ -10,7 +10,9 @@ const loopback = [
   '127.0.0.255',
   '127.1.2.3',
   '[::1]',
+  '::1',
   '[0:0:0:0:0:0:0:1]',
+  '0:0:0:0:0:0:0:1',
 ];
 
 const loopbackNot = [
@@ -21,6 +23,10 @@ const loopbackNot = [
   '[2001:db8::1]',
   '[fe80::1]',
   '8.8.8.8',
+  '::2',
+  '[::2]',
+  '0:0:0:0:0:0:0:2',
+  '[0:0:0:0:0:0:0:2]',
 ];
 
 for (const address of loopback) {