Fixed update_time to use a better algorithm for

preventing time backtracks even if the system
clock backtracks.


git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@789 e7ae566f-a301-0410-adde-c780ea21d3b5

2 files changed, 5 insertions, 1 deletions

diff --git a/otime.c b/otime.c
index ad9cbbf..14a52af 100644
--- a/otime.c
+++ b/otime.c
@@ -35,6 +35,7 @@
 #include "memdbg.h"
 
 volatile time_t now; /* GLOBAL */
+unsigned int now_adj = 0; /* GLOBAL */
 
 /* 
  * Return a numerical string describing a struct timeval.
diff --git a/otime.h b/otime.h
index 0026646..09a85c7 100644
--- a/otime.h
+++ b/otime.h
@@ -55,13 +55,16 @@ const char *tv_string (const struct timeval *tv, struct gc_arena *gc);
 const char *tv_string_abs (const struct timeval *tv, struct gc_arena *gc);
 
 extern volatile time_t now; /* updated frequently to time(NULL) */
+extern unsigned int now_adj;
 
 static inline void
 update_time (void)
 {
-  const time_t real_time = time (NULL);
+  const time_t real_time = time (NULL) + now_adj;
   if (real_time > now)
     now = real_time;
+  else if (real_time < now)
+    now_adj += (now - real_time);
 }
 
 static inline void