guacamole-spice-protocol/src/protocols/rdp/guac_rdpdr/rdpdr_printer.c

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include "config.h"

#include "rdpdr_messages.h"
#include "rdpdr_printer.h"
#include "rdpdr_print_job.h"
#include "rdpdr_service.h"
#include "rdp_status.h"

#include <freerdp/utils/svc_plugin.h>
#include <guacamole/client.h>
#include <guacamole/protocol.h>
#include <guacamole/socket.h>
#include <guacamole/stream.h>
#include <guacamole/user.h>

#ifdef ENABLE_WINPR
#include <winpr/stream.h>
#else
#include "compat/winpr-stream.h"
#endif

#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void guac_rdpdr_process_print_job_create(guac_rdpdr_device* device,
        wStream* input_stream, int completion_id) {

    /* Log creation of print job */
    guac_client_log(device->rdpdr->client, GUAC_LOG_INFO, "Print job created");

    /* Create print job */
    device->data = guac_client_for_owner(device->rdpdr->client,
            guac_rdpdr_print_job_alloc, NULL);

    /* Respond with success */
    wStream* output_stream = guac_rdpdr_new_io_completion(device,
            completion_id, STATUS_SUCCESS, 4);

    Stream_Write_UINT32(output_stream, 0); /* fileId */
    svc_plugin_send((rdpSvcPlugin*) device->rdpdr, output_stream);

}

void guac_rdpdr_process_print_job_write(guac_rdpdr_device* device,
        wStream* input_stream, int completion_id) {

    guac_rdpdr_print_job* job = (guac_rdpdr_print_job*) device->data;

    unsigned char* buffer;
    int length;
    int status;

    /* Read buffer of print data */
    Stream_Read_UINT32(input_stream, length);
    Stream_Seek(input_stream, 8);  /* Offset */
    Stream_Seek(input_stream, 20); /* Padding */
    buffer = Stream_Pointer(input_stream);

    /* Write data only if job exists, translating status for RDP */
    if (job != NULL && (length = guac_rdpdr_print_job_write(job,
                    buffer, length)) >= 0) {
        status = STATUS_SUCCESS;
    }

    /* Report device offline if write fails */
    else {
        status = STATUS_DEVICE_OFF_LINE;
        length = 0;
    }

    wStream* output_stream = guac_rdpdr_new_io_completion(device,
            completion_id, status, 5);

    Stream_Write_UINT32(output_stream, length);
    Stream_Write_UINT8(output_stream, 0); /* Padding */

    svc_plugin_send((rdpSvcPlugin*) device->rdpdr, output_stream);

}

void guac_rdpdr_process_print_job_close(guac_rdpdr_device* device,
        wStream* input_stream, int completion_id) {

    /* End print job */
    guac_rdpdr_print_job* job = (guac_rdpdr_print_job*) device->data;
    if (job != NULL) {
        guac_rdpdr_print_job_free(job);
        device->data = NULL;
    }

    wStream* output_stream = guac_rdpdr_new_io_completion(device,
            completion_id, STATUS_SUCCESS, 4);

    Stream_Write_UINT32(output_stream, 0); /* Padding */
    svc_plugin_send((rdpSvcPlugin*) device->rdpdr, output_stream);

    /* Log end of print job */
    guac_client_log(device->rdpdr->client, GUAC_LOG_INFO, "Print job closed");

}

static void guac_rdpdr_device_printer_announce_handler(guac_rdpdr_device* device,
        wStream* output_stream, int device_id) {

    /* Printer header */
    guac_client_log(device->rdpdr->client, GUAC_LOG_INFO, "Sending printer");
    Stream_Write_UINT32(output_stream, RDPDR_DTYP_PRINT);
    Stream_Write_UINT32(output_stream, device_id);
    Stream_Write(output_stream, "PRN1\0\0\0\0", 8); /* DOS name */

    /* Printer data */
    Stream_Write_UINT32(output_stream, 24 + GUAC_PRINTER_DRIVER_LENGTH + GUAC_PRINTER_NAME_LENGTH);
    Stream_Write_UINT32(output_stream,
              RDPDR_PRINTER_ANNOUNCE_FLAG_DEFAULTPRINTER
            | RDPDR_PRINTER_ANNOUNCE_FLAG_NETWORKPRINTER);
    Stream_Write_UINT32(output_stream, 0); /* reserved - must be 0 */
    Stream_Write_UINT32(output_stream, 0); /* PnPName length (PnPName is ultimately ignored) */
    Stream_Write_UINT32(output_stream, GUAC_PRINTER_DRIVER_LENGTH); /* DriverName length */
    Stream_Write_UINT32(output_stream, GUAC_PRINTER_NAME_LENGTH);   /* PrinterName length */
    Stream_Write_UINT32(output_stream, 0);                          /* CachedFields length */

    Stream_Write(output_stream, GUAC_PRINTER_DRIVER, GUAC_PRINTER_DRIVER_LENGTH);
    Stream_Write(output_stream, GUAC_PRINTER_NAME,   GUAC_PRINTER_NAME_LENGTH);

}

static void guac_rdpdr_device_printer_iorequest_handler(guac_rdpdr_device* device,
        wStream* input_stream, int file_id, int completion_id, int major_func, int minor_func) {

    switch (major_func) {

        /* Print job create */
        case IRP_MJ_CREATE:
            guac_rdpdr_process_print_job_create(device, input_stream, completion_id);
            break;

        /* Printer job write */
        case IRP_MJ_WRITE:
            guac_rdpdr_process_print_job_write(device, input_stream, completion_id);
            break;

        /* Printer job close */
        case IRP_MJ_CLOSE:
            guac_rdpdr_process_print_job_close(device, input_stream, completion_id);
            break;

        /* Log unknown */
        default:
            guac_client_log(device->rdpdr->client, GUAC_LOG_ERROR,
                    "Unknown printer I/O request function: 0x%x/0x%x",
                    major_func, minor_func);

    }

}

static void guac_rdpdr_device_printer_free_handler(guac_rdpdr_device* device) {

    /* Terminate and free print job if open */
    guac_rdpdr_print_job* job = (guac_rdpdr_print_job*) device->data;
    if (job != NULL) {
        guac_rdpdr_print_job_kill(job);
        guac_rdpdr_print_job_free(job);
    }

}

void guac_rdpdr_register_printer(guac_rdpdrPlugin* rdpdr) {

    int id = rdpdr->devices_registered++;

    /* Get new device */
    guac_rdpdr_device* device = &(rdpdr->devices[id]);

    /* Init device */
    device->rdpdr       = rdpdr;
    device->device_id   = id;
    device->device_name = "Guacamole Printer";

    /* Set handlers */
    device->announce_handler  = guac_rdpdr_device_printer_announce_handler;
    device->iorequest_handler = guac_rdpdr_device_printer_iorequest_handler;
    device->free_handler      = guac_rdpdr_device_printer_free_handler;

    /* No active print job yet */
    device->data = NULL;

}