[PATCH 01 of 15] Correct SSL shutdown handling

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1314880281 -14400
# Node ID 18293703cbf48c934f8f601c235b7d9e06e93be5
# Parent  5d94f8b3e01d74ec6bd5bdcae176a8d3b998237d
Correct SSL shutdown handling.

If connection has unsent alerts, SSL_shutdown() tries to send them even
if SSL_set_shutdown(SSL_RECEIVED_SHUTDOWN|SSL_SENT_SHUTDOWN) was used.
This can be prevented by SSL_set_quiet_shutdown().  SSL_set_shutdown()
is required nevertheless to preserve session.

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1205,6 +1205,7 @@ ngx_ssl_shutdown(ngx_connection_t *c)
 
     if (c->timedout) {
         mode = SSL_RECEIVED_SHUTDOWN|SSL_SENT_SHUTDOWN;
+        SSL_set_quiet_shutdown(c->ssl->connection, 1);
 
     } else {
         mode = SSL_get_shutdown(c->ssl->connection);
@@ -1216,6 +1217,10 @@ ngx_ssl_shutdown(ngx_connection_t *c)
         if (c->ssl->no_send_shutdown) {
             mode |= SSL_SENT_SHUTDOWN;
         }
+
+        if (c->ssl->no_wait_shutdown && c->ssl->no_send_shutdown) {
+            SSL_set_quiet_shutdown(c->ssl->connection, 1);
+        }
     }
 
     SSL_set_shutdown(c->ssl->connection, mode);