idevice: fix hang in SSL_shutdown

1 files changed, 7 insertions, 1 deletions

diff --git a/src/idevice.c b/src/idevice.c
index fd1f4b5..90b531d 100644
--- a/src/idevice.c
+++ b/src/idevice.c
@@ -930,7 +930,13 @@ LIBIMOBILEDEVICE_API idevice_error_t idevice_connection_disable_ssl(idevice_conn
         if (connection->ssl_data->session) {
                 /* see: https://www.openssl.org/docs/ssl/SSL_shutdown.html#RETURN_VALUES */
                 if (SSL_shutdown(connection->ssl_data->session) == 0) {
-                        SSL_shutdown(connection->ssl_data->session);
+                        /* Only try bidirectional shutdown if we know it can complete */
+                        int ssl_error;
+                        if ((ssl_error = SSL_get_error(connection->ssl_data->session, 0)) == SSL_ERROR_NONE) {
+                                SSL_shutdown(connection->ssl_data->session);
+                        } else  {
+                                debug_info("Skipping bidirectional SSL shutdown. SSL error code: %i\n", ssl_error);
+                        }
                 }
         }
 #else