TPM_COMM_HANDLE tpm_comm_create()

in src/tpm_comm_linux.c [311:341]

• 28 lines of code
• 5 McCabe index (conditional complexity)

TPM_COMM_HANDLE tpm_comm_create(const char* endpoint)
{
    TPM_COMM_INFO* result;
    (void)endpoint;
    if ((result = malloc(sizeof(TPM_COMM_INFO))) == NULL)
    {
        LogError("Failure: malloc tpm communication info.");
    }
    else
    {
        memset(result, 0, sizeof(TPM_COMM_INFO));
        // First check if kernel mode TPM Resource Manager is available
        if ((result->dev_info.tpm_device = open(TPM_RM_DEVICE_NAME, O_RDWR)) >= 0)
        {
            result->conn_info = TCI_SYS_DEV | TCI_TRM;
        }
        // If not, connect to the raw TPM device
        else if ((result->dev_info.tpm_device = open(TPM_DEVICE_NAME, O_RDWR)) >= 0)
        {
            result->conn_info = TCI_SYS_DEV;
        }
        // If the system TPM device is unavalable, try connecting to the user mode TPM resource manager
        else if (tpm_usermode_resmgr_connect(result) != 0)
        {
            LogError("Failure: connecting to the TPM device");
            free(result);
            result = NULL;
        }
    }
    return result;
}