From: Jeremy Harris <jgh146exb@wizmail.org>
Date: Sat, 23 Jan 2021 21:28:28 +0000 (+0000)
Subject: Move QUICKACK disable as early as possible in server handling
X-Git-Url: https://git.exim.org/users/heiko/exim.git/commitdiff_plain/2130e492c2cda886d74abbb77df4493f151e0a44

Move QUICKACK disable as early as possible in server handling
---

diff --git a/src/src/daemon.c b/src/src/daemon.c
index 21807f64f..1006961d3 100644
--- a/src/src/daemon.c
+++ b/src/src/daemon.c
@@ -2431,6 +2431,11 @@ for (;;)
 
       if (accept_socket >= 0)
         {
+#ifdef TCP_QUICKACK /* Avoid pure-ACKs while in tls protocol pingpong phase */
+	/* Unfortunately we cannot be certain to do this before a TLS-on-connect
+	Client Hello arrives and is acked. We do it as early as possible. */
+	(void) setsockopt(accept_socket, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
+#endif
         if (inetd_wait_timeout)
           last_connection_time = time(NULL);
         handle_smtp_call(listen_sockets, listen_socket_count, accept_socket,
diff --git a/src/src/smtp_in.c b/src/src/smtp_in.c
index 4cc619014..0467b2257 100644
--- a/src/src/smtp_in.c
+++ b/src/src/smtp_in.c
@@ -2902,13 +2902,8 @@ if (check_proxy_protocol_host())
   setup_proxy_protocol_host();
 #endif
 
-#ifdef TCP_QUICKACK /* Avoid pure-ACKs while in tls protocol pingpong phase */
-(void) setsockopt(fileno(smtp_in), IPPROTO_TCP, TCP_QUICKACK,
-	  US &off, sizeof(off));
-#endif
-
-  /* Start up TLS if tls_on_connect is set. This is for supporting the legacy
-  smtps port for use with older style SSL MTAs. */
+/* Start up TLS if tls_on_connect is set. This is for supporting the legacy
+smtps port for use with older style SSL MTAs. */
 
 #ifndef DISABLE_TLS
 if (tls_in.on_connect)