From c533cd318037244749def1d8ed866e95f79eb182 Mon Sep 17 00:00:00 2001
From: Otto Moerbeek <otto.moerbeek@open-xchange.com>
Date: Tue, 28 Sep 2021 10:24:06 +0200
Subject: [PATCH] add O_APPEND

Co-authored-by: Remi Gacogne <github@coredump.fr>
---
 pdns/libssl.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pdns/libssl.cc b/pdns/libssl.cc
index 1f67eabb57..3e262331fd 100644
--- a/pdns/libssl.cc
+++ b/pdns/libssl.cc
@@ -782,7 +782,7 @@ static void libssl_key_log_file_callback(const SSL* ssl, const char* line)
 std::unique_ptr<FILE, int(*)(FILE*)> libssl_set_key_log_file(std::unique_ptr<SSL_CTX, void(*)(SSL_CTX*)>& ctx, const std::string& logFile)
 {
 #ifdef HAVE_SSL_CTX_SET_KEYLOG_CALLBACK
-  int fd = open(logFile.c_str(),  O_WRONLY | O_CREAT, 0600);
+  int fd = open(logFile.c_str(),  O_WRONLY | O_CREAT | O_APPEND, 0600);
   if (fd == -1) {
     unixDie("Error opening TLS log file '" + logFile + "'");
   }
-- 
2.47.2