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       1                 :             : /**
       2                 :             :  *  Copyright Notice:
       3                 :             :  *  Copyright 2021-2026 DMTF. All rights reserved.
       4                 :             :  *  License: BSD 3-Clause License. For full text see link: https://github.com/DMTF/libspdm/blob/main/LICENSE.md
       5                 :             :  **/
       6                 :             : 
       7                 :             : #include "internal/libspdm_responder_lib.h"
       8                 :             : 
       9                 :             : #if LIBSPDM_RESPOND_IF_READY_SUPPORT
      10                 :             : 
      11                 :          21 : libspdm_return_t libspdm_get_response_respond_if_ready(libspdm_context_t *spdm_context,
      12                 :             :                                                        size_t request_size,
      13                 :             :                                                        const void *request,
      14                 :             :                                                        size_t *response_size,
      15                 :             :                                                        void *response)
      16                 :             : {
      17                 :             :     const spdm_message_header_t *spdm_request;
      18                 :             :     libspdm_get_spdm_response_func get_response_func;
      19                 :             :     libspdm_return_t status;
      20                 :             : 
      21                 :          21 :     spdm_request = request;
      22                 :             : 
      23                 :             :     /* -=[Check Parameters Phase]=- */
      24         [ -  + ]:          21 :     LIBSPDM_ASSERT(spdm_request->request_response_code == SPDM_RESPOND_IF_READY);
      25                 :             : 
      26         [ -  + ]:          21 :     if (spdm_request->spdm_version != libspdm_get_connection_version(spdm_context)) {
      27                 :           0 :         return libspdm_generate_error_response(spdm_context,
      28                 :             :                                                SPDM_ERROR_CODE_VERSION_MISMATCH, 0,
      29                 :             :                                                response_size, response);
      30                 :             :     }
      31         [ +  + ]:          21 :     if (spdm_context->response_state != LIBSPDM_RESPONSE_STATE_NORMAL) {
      32                 :           6 :         return libspdm_responder_handle_response_state(
      33                 :           6 :             spdm_context, spdm_request->request_response_code,
      34                 :             :             response_size, response);
      35                 :             :     }
      36                 :             : 
      37         [ -  + ]:          15 :     if (request_size < sizeof(spdm_message_header_t)) {
      38                 :           0 :         return libspdm_generate_error_response(spdm_context,
      39                 :             :                                                SPDM_ERROR_CODE_INVALID_REQUEST, 0,
      40                 :             :                                                response_size, response);
      41                 :             :     }
      42                 :             : 
      43         [ +  + ]:          15 :     if (spdm_context->cache_spdm_request_size == 0) {
      44                 :           1 :         return libspdm_generate_error_response(spdm_context,
      45                 :             :                                                SPDM_ERROR_CODE_UNEXPECTED_REQUEST, 0,
      46                 :             :                                                response_size, response);
      47                 :             :     }
      48                 :             : 
      49                 :             :     /* The validity of the RESPOND_IF_READY request is defined by the original request that caused
      50                 :             :      * the RESPOND_IF_READY flow (the last request to which the Responder sent an ERROR message of
      51                 :             :      * ErrorCode=ResponseNotReady). The RESPOND_IF_READY shall therefore arrive in the same session
      52                 :             :      * context as that original request: the same in-session / out-of-session state, and, when in a
      53                 :             :      * session, the same session_id. Otherwise the cached response would be returned outside the
      54                 :             :      * context it belongs to. (Only one deferred request is tracked per connection; a conformant
      55                 :             :      * Requester does not have multiple outstanding requests to the same Responder within a
      56                 :             :      * connection.) */
      57                 :          14 :     if ((spdm_context->last_spdm_request_session_id_valid !=
      58         [ +  + ]:          14 :          spdm_context->cache_spdm_request_session_id_valid) ||
      59         [ +  + ]:          13 :         (spdm_context->cache_spdm_request_session_id_valid &&
      60                 :           1 :          (spdm_context->last_spdm_request_session_id !=
      61         [ -  + ]:           1 :           spdm_context->cache_spdm_request_session_id))) {
      62                 :           1 :         return libspdm_generate_error_response(spdm_context,
      63                 :             :                                                SPDM_ERROR_CODE_UNEXPECTED_REQUEST, 0,
      64                 :             :                                                response_size, response);
      65                 :             :     }
      66                 :             : 
      67         [ +  + ]:          13 :     if (spdm_request->param1 != spdm_context->error_data.request_code) {
      68                 :           1 :         return libspdm_generate_error_response(spdm_context,
      69                 :             :                                                SPDM_ERROR_CODE_INVALID_REQUEST, 0,
      70                 :             :                                                response_size, response);
      71                 :             :     }
      72         [ -  + ]:          12 :     if (spdm_request->param1 == SPDM_RESPOND_IF_READY) {
      73                 :           0 :         return libspdm_generate_error_response(spdm_context,
      74                 :             :                                                SPDM_ERROR_CODE_INVALID_REQUEST, 0,
      75                 :             :                                                response_size, response);
      76                 :             :     }
      77         [ +  + ]:          12 :     if (spdm_request->param2 != spdm_context->error_data.token) {
      78                 :           1 :         return libspdm_generate_error_response(spdm_context,
      79                 :             :                                                SPDM_ERROR_CODE_INVALID_REQUEST, 0,
      80                 :             :                                                response_size, response);
      81                 :             :     }
      82                 :             : 
      83                 :          11 :     get_response_func = NULL;
      84                 :          11 :     get_response_func = libspdm_get_response_func_via_request_code(spdm_request->param1);
      85         [ -  + ]:          11 :     if (get_response_func == NULL) {
      86                 :           0 :         return libspdm_generate_error_response(
      87                 :             :             spdm_context, SPDM_ERROR_CODE_UNSUPPORTED_REQUEST,
      88                 :           0 :             spdm_request->param1, response_size, response);
      89                 :             :     }
      90                 :          11 :     status = get_response_func(spdm_context,
      91                 :             :                                spdm_context->cache_spdm_request_size,
      92                 :          11 :                                spdm_context->cache_spdm_request,
      93                 :             :                                response_size, response);
      94                 :             : 
      95                 :          11 :     libspdm_zero_mem(spdm_context->cache_spdm_request, spdm_context->cache_spdm_request_size);
      96                 :          11 :     spdm_context->cache_spdm_request_size = 0;
      97                 :             : 
      98                 :          11 :     return status;
      99                 :             : }
     100                 :             : 
     101                 :             : #endif /* LIBSPDM_RESPOND_IF_READY_SUPPORT */