From c0a414394204f2f3e10ff3183e198b4698eeb9fa Mon Sep 17 00:00:00 2001
From: John Safranek <john@wolfssl.com>
Date: Tue, 16 Jul 2019 11:21:08 -0700
Subject: [PATCH] Titan Session Cache 1. Added a new build option for a TITAN
 session cache that can hold just over 2 million session entires. 2. Reordered
 the cache options from largest to smallest.

---
 configure.ac | 27 ++++++++++++++++++++-------
 src/ssl.c    | 17 ++++++++++++-----
 2 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/configure.ac b/configure.ac
index 9e828c48d..764257178 100644
--- a/configure.ac
+++ b/configure.ac
@@ -665,16 +665,16 @@ then
 fi
 
 
-# big cache
-AC_ARG_ENABLE([bigcache],
-    [AS_HELP_STRING([--enable-bigcache],[Enable big session cache (default: disabled)])],
-    [ ENABLED_BIGCACHE=$enableval ],
-    [ ENABLED_BIGCACHE=no ]
+# TITAN cache
+AC_ARG_ENABLE([titancache],
+    [AS_HELP_STRING([--enable-titancache],[Enable titan session cache (default: disabled)])],
+    [ ENABLED_TITANCACHE=$enableval ],
+    [ ENABLED_TITANCACHE=no ]
     )
 
-if test "$ENABLED_BIGCACHE" = "yes"
+if test "$ENABLED_TITANCACHE" = "yes"
 then
-    AM_CFLAGS="$AM_CFLAGS -DBIG_SESSION_CACHE"
+    AM_CFLAGS="$AM_CFLAGS -DTITAN_SESSION_CACHE"
 fi
 
 
@@ -691,6 +691,19 @@ then
 fi
 
 
+# big cache
+AC_ARG_ENABLE([bigcache],
+    [AS_HELP_STRING([--enable-bigcache],[Enable big session cache (default: disabled)])],
+    [ ENABLED_BIGCACHE=$enableval ],
+    [ ENABLED_BIGCACHE=no ]
+    )
+
+if test "$ENABLED_BIGCACHE" = "yes"
+then
+    AM_CFLAGS="$AM_CFLAGS -DBIG_SESSION_CACHE"
+fi
+
+
 # SMALL cache
 AC_ARG_ENABLE([smallcache],
     [AS_HELP_STRING([--enable-smallcache],[Enable small session cache (default: disabled)])],
diff --git a/src/ssl.c b/src/ssl.c
index 51cd0964a..ef15e72dc 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -4613,22 +4613,29 @@ int AddCA(WOLFSSL_CERT_MANAGER* cm, DerBuffer** pDer, int type, int verify)
     /* basic config gives a cache with 33 sessions, adequate for clients and
        embedded servers
 
-       MEDIUM_SESSION_CACHE allows 1055 sessions, adequate for servers that
-       aren't under heavy load, basically allows 200 new sessions per minute
-
-       BIG_SESSION_CACHE yields 20,027 sessions
+       TITAN_SESSION_CACHE allows just over 2 million sessions, for servers
+       with titanic amounts of memory with long session ID timeouts and high
+       levels of traffic.
 
        HUGE_SESSION_CACHE yields 65,791 sessions, for servers under heavy load,
        allows over 13,000 new sessions per minute or over 200 new sessions per
        second
 
+       BIG_SESSION_CACHE yields 20,027 sessions
+
+       MEDIUM_SESSION_CACHE allows 1055 sessions, adequate for servers that
+       aren't under heavy load, basically allows 200 new sessions per minute
+
        SMALL_SESSION_CACHE only stores 6 sessions, good for embedded clients
        or systems where the default of nearly 3kB is too much RAM, this define
        uses less than 500 bytes RAM
 
        default SESSION_CACHE stores 33 sessions (no XXX_SESSION_CACHE defined)
     */
-    #ifdef HUGE_SESSION_CACHE
+    #if defined(TITAN_SESSION_CACHE)
+        #define SESSIONS_PER_ROW 31
+        #define SESSION_ROWS 64937
+    #elif defined(HUGE_SESSION_CACHE)
         #define SESSIONS_PER_ROW 11
         #define SESSION_ROWS 5981
     #elif defined(BIG_SESSION_CACHE)