Use a fixed time when fuzzing.

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NAndy Polyakov <appro@openssl.org>
GH: #2683

fuzz/client.c

@@ -8,6 +8,7 @@
  * or in the file LICENSE in the source distribution.
  */
 
+#include <time.h>
 #include <openssl/rand.h>
 #include <openssl/ssl.h>
 #include <openssl/rsa.h>
@@ -25,6 +26,23 @@ extern int rand_predictable;
 /* unused, to avoid warning. */
 static int idx;
 
+#define FUZZTIME 1485898104
+
+#define TIME_IMPL(t) { if (t != NULL) *t = FUZZTIME; return FUZZTIME; }
+
+/*
+ * This might not in all cases and still get the current time
+ * instead of the fixed time. This will just result in things
+ * not being fully reproducible and have a slightly different
+ * coverage.
+ */
+#if defined(_WIN32) && defined(_TIME64_T_DEFINED)
+time64_t _time64(time64_t *t) TIME_IMPL(t)
+#endif
+#if !defined(_WIN32) || !defined(_MSC_VER)
+time_t time(time_t *t) TIME_IMPL(t)
+#endif
+
 int FuzzerInitialize(int *argc, char ***argv)
 {
     STACK_OF(SSL_COMP) *comp_methods;

fuzz/server.c

@@ -12,7 +12,7 @@
 
 /* Test first part of SSL server handshake. */
 
-
+#include <time.h>
 #include <openssl/rand.h>
 #include <openssl/ssl.h>
 #include <openssl/rsa.h>
@@ -473,6 +473,23 @@ extern int rand_predictable;
 /* unused, to avoid warning. */
 static int idx;
 
+#define FUZZTIME 1485898104
+
+#define TIME_IMPL(t) { if (t != NULL) *t = FUZZTIME; return FUZZTIME; }
+
+/*
+ * This might not in all cases and still get the current time
+ * instead of the fixed time. This will just result in things
+ * not being fully reproducible and have a slightly different
+ * coverage.
+ */
+#if defined(_WIN32) && defined(_TIME64_T_DEFINED)
+time64_t _time64(time64_t *t) TIME_IMPL(t)
+#endif
+#if !defined(_WIN32) || !defined(_MSC_VER)
+time_t time(time_t *t) TIME_IMPL(t)
+#endif
+
 int FuzzerInitialize(int *argc, char ***argv)
 {
     STACK_OF(SSL_COMP) *comp_methods;