From def137bc80f037280c0aa9fb9e635bb32ccd378c Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Mon, 27 Jul 2020 12:57:44 +0200
Subject: [PATCH] nts: scale server listening backlog with number of helpers

---
 nts_ke_server.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/nts_ke_server.c b/nts_ke_server.c
index 67500f4..41c0606 100644
--- a/nts_ke_server.c
+++ b/nts_ke_server.c
@@ -277,8 +277,8 @@ static int
 open_socket(int family)
 {
   IPSockAddr local_addr;
+  int backlog, sock_fd;
   char *iface;
-  int sock_fd;
 
   if (!SCK_IsIpFamilyEnabled(family))
     return INVALID_SOCK_FD;
@@ -293,7 +293,11 @@ open_socket(int family)
     return INVALID_SOCK_FD;
   }
 
-  if (!SCK_ListenOnSocket(sock_fd, CNF_GetNtsServerConnections())) {
+  /* Set the maximum number of waiting connections on the socket to the maximum
+     number of concurrent sessions */
+  backlog = MAX(CNF_GetNtsServerProcesses(), 1) * CNF_GetNtsServerConnections();
+
+  if (!SCK_ListenOnSocket(sock_fd, backlog)) {
     SCK_CloseSocket(sock_fd);
     return INVALID_SOCK_FD;
   }