Fix undocumented option in ssl_server2
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 516ac53..9152213 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -104,6 +104,7 @@
 #define DFL_ALLOW_LEGACY        SSL_LEGACY_NO_RENEGOTIATION
 #define DFL_RENEGOTIATE         0
 #define DFL_RENEGO_DELAY        -2
+#define DFL_EXCHANGES           1
 #define DFL_MIN_VERSION         -1
 #define DFL_MAX_VERSION         -1
 #define DFL_AUTH_MODE           SSL_VERIFY_OPTIONAL
@@ -163,6 +164,7 @@
     int allow_legacy;           /* allow legacy renegotiation               */
     int renegotiate;            /* attempt renegotiation?                   */
     int renego_delay;           /* delay before enforcing renegotiation     */
+    int exchanges;              /* number of data exchanges                 */
     int min_version;            /* minimum protocol version accepted        */
     int max_version;            /* maximum protocol version accepted        */
     int auth_mode;              /* verify mode for connection               */
@@ -316,6 +318,8 @@
     "    renegotiation=%%d    default: 1 (enabled)\n"       \
     "    allow_legacy=%%d     default: 0 (disabled)\n"      \
     "    renegotiate=%%d      default: 0 (disabled)\n"      \
+    "    renego_delay=%%d     default: -2 (library default)\n" \
+    "    exchanges=%%d        default: 1\n"                 \
     USAGE_TICKETS                                           \
     USAGE_CACHE                                             \
     USAGE_MAX_FRAG_LEN                                      \
@@ -697,6 +701,7 @@
     opt.allow_legacy        = DFL_ALLOW_LEGACY;
     opt.renegotiate         = DFL_RENEGOTIATE;
     opt.renego_delay        = DFL_RENEGO_DELAY;
+    opt.exchanges           = DFL_EXCHANGES;
     opt.min_version         = DFL_MIN_VERSION;
     opt.max_version         = DFL_MAX_VERSION;
     opt.auth_mode           = DFL_AUTH_MODE;
@@ -790,6 +795,12 @@
         {
             opt.renego_delay = atoi( q );
         }
+        else if( strcmp( p, "exchanges" ) == 0 )
+        {
+            opt.exchanges = atoi( q );
+            if( opt.exchanges < 1 )
+                goto usage;
+        }
         else if( strcmp( p, "min_version" ) == 0 )
         {
             if( strcmp( q, "ssl3" ) == 0 )