From eaba9adb03f0427ecf0a7a8b6937a6b82e134266 Mon Sep 17 00:00:00 2001
From: Giorgi Rostomashvili <giorgi.rostomashvili@inthepocket.com>
Date: Sun, 27 Sep 2020 16:44:53 +0200
Subject: [PATCH] fix: net listen crashes on explicit undefined hostname
 (#7706)

---
 cli/rt/30_net.js           |  4 ++--
 cli/tests/unit/net_test.ts | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/cli/rt/30_net.js b/cli/rt/30_net.js
index 53de5200d2..9a71f06935 100644
--- a/cli/rt/30_net.js
+++ b/cli/rt/30_net.js
@@ -203,10 +203,10 @@
     }
   }
 
-  function listen(options) {
+  function listen({ hostname, ...options }) {
     const res = opListen({
       transport: "tcp",
-      hostname: "0.0.0.0",
+      hostname: typeof hostname === "undefined" ? "0.0.0.0" : hostname,
       ...options,
     });
 
diff --git a/cli/tests/unit/net_test.ts b/cli/tests/unit/net_test.ts
index 2c61343189..8eaabdbba3 100644
--- a/cli/tests/unit/net_test.ts
+++ b/cli/tests/unit/net_test.ts
@@ -533,3 +533,14 @@ unitTest(
     await resolvable;
   },
 );
+
+unitTest(
+  {
+    perms: { net: true },
+  },
+  function netExplicitUndefinedHostname() {
+    const listener = Deno.listen({ hostname: undefined, port: 8080 });
+    assertEquals((listener.addr as Deno.NetAddr).hostname, "0.0.0.0");
+    listener.close();
+  },
+);