FIX if server starts to speek immediatly (banners protocol)

FIX on send PROXY header if handshake is not finished.
FIX if client starts renegotiation and server continue to send data, or ring_down buffer is not empty.
Add define to compile without defer accept for banners protocols

stud.c

@@ -684,10 +684,12 @@ static int create_main_socket() {
         fail("{bind-socket}");
     }
 
+#ifndef NO_DEFER_ACCEPT
 #if TCP_DEFER_ACCEPT
     int timeout = 1; 
     setsockopt(s, IPPROTO_TCP, TCP_DEFER_ACCEPT, &timeout, sizeof(int) );
 #endif /* TCP_DEFER_ACCEPT */
+#endif
 
     prepare_proxy_line(ai->ai_addr);
 
@@ -792,7 +794,8 @@ static void back_read(struct ev_loop *loop, ev_io *w, int revents) {
         ringbuffer_write_append(&ps->ring_up, t);
         if (ringbuffer_is_full(&ps->ring_up))
             ev_io_stop(loop, &ps->ev_r_down);
-        safe_enable_io(ps, &ps->ev_w_up);
+        if (ps->handshaked)
+            safe_enable_io(ps, &ps->ev_w_up);
     }
     else if (t == 0) {
         LOG("{backend} Connection closed\n");
@@ -820,7 +823,8 @@ static void back_write(struct ev_loop *loop, ev_io *w, int revents) {
     if (t > 0) {
         if (t == sz) {
             ringbuffer_read_pop(&ps->ring_down);
-            safe_enable_io(ps, &ps->ev_r_up);
+            if (ps->handshaked)
+                safe_enable_io(ps, &ps->ev_r_up);
             if (ringbuffer_is_empty(&ps->ring_down)) {
                 if (ps->want_shutdown) {
                     shutdown_proxy(ps, SHUTDOWN_HARD);
@@ -914,6 +918,9 @@ static void handle_connect(struct ev_loop *loop, ev_io *w, int revents) {
 static void start_handshake(proxystate *ps, int err) {
     ev_io_stop(loop, &ps->ev_r_up);
     ev_io_stop(loop, &ps->ev_w_up);
+
+    ps->handshaked = 0;
+
     if (err == SSL_ERROR_WANT_READ)
         ev_io_start(loop, &ps->ev_r_handshake);
     else if (err == SSL_ERROR_WANT_WRITE)