Explicitly shut the socket down in s_client

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5072)

(cherry picked from commit 26ec943e020c0db6a25e6d155ba318270eff0fd7)

diff --git a/apps/s_client.c b/apps/s_client.c
index fab007a86aa833d560c01f7937308e27740f9d9e..d1605454b9ebf2fdc4173ea7d27d34b1612e98ee 100644 (file)
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -2471,6 +2471,17 @@ int s_client_main(int argc, char **argv)
      */
     Sleep(50);
 #endif
+    /*
+     * If we ended with an alert being sent, but still with data in the
+     * network buffer to be read, then calling BIO_closesocket() will
+     * result in a TCP-RST being sent. On some platforms (notably
+     * Windows) then this will result in the peer immediately abandoning
+     * the connection including any buffered alert data before it has
+     * had a chance to be read. Shutting down the sending side first,
+     * and then closing the socket sends TCP-FIN first followed by
+     * TCP-RST. This seems to allow the peer to read the alert data.
+     */
+    shutdown(SSL_get_fd(con), 1); /* SHUT_WR */
     BIO_closesocket(SSL_get_fd(con));
  end:
     if (con != NULL) {