- if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
- ENGINE_CTRL_GET_CMD_FROM_NAME,
- 0, (void *)cmd_name, NULL)) <= 0))
- {
- /* If the command didn't *have* to be supported, we fake
- * success. This allows certain settings to be specified for
- * multiple ENGINEs and only require a change of ENGINE id
- * (without having to selectively apply settings). Eg. changing
- * from a hardware device back to the regular software ENGINE
- * without editing the config file, etc. */
- if(cmd_optional)
- {
- ERR_clear_error();
- return 1;
- }
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_INVALID_CMD_NAME);
- return 0;
- }
- if(!ENGINE_cmd_is_executable(e, num))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_CMD_NOT_EXECUTABLE);
- return 0;
- }
- if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL)) < 0)
- {
- /* Shouldn't happen, given that ENGINE_cmd_is_executable()
- * returned success. */
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_INTERNAL_LIST_ERROR);
- return 0;
- }
- /* If the command takes no input, there must be no input. And vice
- * versa. */
- if(flags & ENGINE_CMD_FLAG_NO_INPUT)
- {
- if(arg != NULL)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_COMMAND_TAKES_NO_INPUT);
- return 0;
- }
- /* We deliberately force the result of ENGINE_ctrl() to 0 or 1
- * rather than returning it as "return data". This is to ensure
- * usage of these commands is consistent across applications and
- * that certain applications don't understand it one way, and
- * others another. */
- if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL))
- return 1;
- return 0;
- }
- /* So, we require input */
- if(arg == NULL)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_COMMAND_TAKES_INPUT);
- return 0;
- }
- /* If it takes string input, that's easy */
- if(flags & ENGINE_CMD_FLAG_STRING)
- {
- /* Same explanation as above */
- if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL))
- return 1;
- return 0;
- }
- /* If it doesn't take numeric either, then it is unsupported for use in
- * a config-setting situation, which is what this function is for. This
- * should never happen though, because ENGINE_cmd_is_executable() was
- * used. */
- if(!(flags & ENGINE_CMD_FLAG_NUMERIC))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_INTERNAL_LIST_ERROR);
- return 0;
- }
- l = strtol(arg, &ptr, 10);
- if((arg == ptr) || (*ptr != '\0'))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
- return 0;
- }
- /* Force the result of the control command to 0 or 1, for the reasons
- * mentioned before. */
- if(ENGINE_ctrl(e, num, l, NULL, NULL))
- return 1;
- return 0;