From 5f7ca8e03c9708c8f30786b7003f1e32a6cfe972 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pierre-Elliott=20B=C3=A9cue?= <becue@crans.org>
Date: Sun, 9 May 2021 14:44:29 +0200
Subject: [PATCH] tests/smtpd.py: Returns a permanent failure for unsupported
 auth mechanisms

smtpd testing server does call a specific method when AUTH PLAIN is
used, but ignores without returning any other auth mechanism. As the
connector tries auth methods in a non-deterministic order, this leads to
a timeout if PLAIN is not the first mechanism tried.

This commit makes the smtpd test server return a permanent failure for
non-supported auth mechanisms.

Fixes issue #171
---
 tests/smtpd.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tests/smtpd.py b/tests/smtpd.py
index b0e1ac30..79ddaddd 100644
--- a/tests/smtpd.py
+++ b/tests/smtpd.py
@@ -115,6 +115,8 @@ async def smtp_AUTH(self, arg):
 
         if arg[:5] == "LOGIN":
             await self.smtp_AUTH_LOGIN(arg[6:])
+        else:
+            await self.push("504 Unsupported AUTH mechanism.")
 
     async def smtp_AUTH_LOGIN(self, arg):
         username = base64.b64decode(arg)