void guac_rdpdr_fs_process_create()

in src/protocols/rdp/channels/rdpdr/rdpdr-fs-messages.c [40:134]

• 66 lines of code
• 8 McCabe index (conditional complexity)

void guac_rdpdr_fs_process_create(guac_rdp_common_svc* svc,
        guac_rdpdr_device* device, guac_rdpdr_iorequest* iorequest,
        wStream* input_stream) {

    wStream* output_stream;
    int file_id;

    int desired_access, file_attributes;
    int create_disposition, create_options, path_length;
    char path[GUAC_RDP_FS_MAX_PATH];

    /* Check remaining stream data prior to reading. */
    if (Stream_GetRemainingLength(input_stream) < 32) {
        guac_client_log(svc->client, GUAC_LOG_WARNING, "Server Create Drive "
                "Request PDU does not contain the expected number of bytes. "
                "Drive redirection may not work as expected.");
        return;
    }
    
    /* Read "create" information */
    Stream_Read_UINT32(input_stream, desired_access);
    Stream_Seek_UINT64(input_stream); /* allocation size */
    Stream_Read_UINT32(input_stream, file_attributes);
    Stream_Seek_UINT32(input_stream); /* shared access */
    Stream_Read_UINT32(input_stream, create_disposition);
    Stream_Read_UINT32(input_stream, create_options);
    Stream_Read_UINT32(input_stream, path_length);

    /* Check to make sure the stream contains path_length bytes. */
    if(Stream_GetRemainingLength(input_stream) < path_length) {
        guac_client_log(svc->client, GUAC_LOG_WARNING, "Server Create Drive "
                "Request PDU does not contain the expected number of bytes. "
                "Drive redirection may not work as expected.");
        return;
    }
    
    /* Convert path to UTF-8 */
    guac_rdp_utf16_to_utf8(Stream_Pointer(input_stream), path_length/2 - 1,
            path, sizeof(path));

    /* Open file */
    file_id = guac_rdp_fs_open((guac_rdp_fs*) device->data, path,
            desired_access, file_attributes,
            create_disposition, create_options);

    guac_client_log(svc->client, GUAC_LOG_DEBUG,
            "%s: [file_id=%i] "
             "desired_access=0x%x, file_attributes=0x%x, "
             "create_disposition=0x%x, create_options=0x%x, path=\"%s\"",
             __func__, file_id,
             desired_access, file_attributes,
             create_disposition, create_options, path);

    /* If an error occurred, notify server */
    if (file_id < 0) {
        guac_client_log(svc->client, GUAC_LOG_ERROR,
                "File open refused (%i): \"%s\"", file_id, path);

        output_stream = guac_rdpdr_new_io_completion(device,
                iorequest->completion_id, guac_rdp_fs_get_status(file_id), 5);
        Stream_Write_UINT32(output_stream, 0); /* fileId */
        Stream_Write_UINT8(output_stream,  0); /* information */
    }

    /* Otherwise, open succeeded */
    else {

        guac_rdp_fs_file* file;

        output_stream = guac_rdpdr_new_io_completion(device,
                iorequest->completion_id, STATUS_SUCCESS, 5);
        Stream_Write_UINT32(output_stream, file_id);    /* fileId */
        Stream_Write_UINT8(output_stream,  0);          /* information */

        /* Create \Download if it doesn't exist */
        file = guac_rdp_fs_get_file((guac_rdp_fs*) device->data, file_id);
        if (file != NULL && strcmp(file->absolute_path, "\\") == 0) {
            
            /* Only create Download folder if downloads are enabled. */
            if (!((guac_rdp_fs*) device->data)->disable_download) {
                int download_id =
                    guac_rdp_fs_open((guac_rdp_fs*) device->data, "\\Download",
                        GENERIC_READ, 0, FILE_OPEN_IF, FILE_DIRECTORY_FILE);
                
                if (download_id >= 0)
                    guac_rdp_fs_close((guac_rdp_fs*) device->data, download_id);
            }

        }

    }

    guac_rdp_common_svc_write(svc, output_stream);

}