/*
 * Copyright (C) 2013 Glyptodon LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef __GUAC_RDP_RDP_SVC_H
#define __GUAC_RDP_RDP_SVC_H

#include "config.h"

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

/**
 * The maximum number of characters to allow for each channel name.
 */
#define GUAC_RDP_SVC_MAX_LENGTH 7

/**
 * Structure describing a static virtual channel, and the corresponding
 * Guacamole pipes.
 */
typedef struct guac_rdp_svc {

    /**
     * Reference to the client owning this static channel.
     */
    guac_client* client;

    /**
     * Reference to associated SVC plugin.
     */
    rdpSvcPlugin* plugin;

    /**
     * The name of the RDP channel in use, and the name to use for each pipe.
     */
    char name[GUAC_RDP_SVC_MAX_LENGTH+1];

    /**
     * The output pipe, opened when the RDP server receives a connection to
     * the static channel.
     */
    guac_stream* output_pipe;

} guac_rdp_svc;

/**
 * Allocate a new SVC with the given name.
 *
 * @param client The guac_client associated with the current RDP session.
 * @param name The name of the virtual channel to allocate.
 * @return A newly-allocated static virtual channel.
 */
guac_rdp_svc* guac_rdp_alloc_svc(guac_client* client, char* name);

/**
 * Free the given SVC.
 *
 * @param svc The static virtual channel to free.
 */
void guac_rdp_free_svc(guac_rdp_svc* svc);

/**
 * Sends the "pipe" instruction describing the given static virtual channel
 * along the given socket. This pipe instruction will relate the SVC's
 * underlying output stream with the SVC's name and the mimetype
 * "application/octet-stream".
 *
 * @param socket
 *     The socket along which the "pipe" instruction should be sent.
 *
 * @param svc
 *     The static virtual channel that the "pipe" instruction should describe.
 */
void guac_rdp_svc_send_pipe(guac_socket* socket, guac_rdp_svc* svc);

/**
 * Sends the "pipe" instructions describing all static virtual channels
 * available to the given user along that user's socket. Each pipe instruction
 * will relate the associated SVC's underlying output stream with the SVC's
 * name and the mimetype "application/octet-stream".
 *
 * @param user
 *     The user to send the "pipe" instructions to.
 */
void guac_rdp_svc_send_pipes(guac_user* user);

/**
 * Add the given SVC to the list of all available SVCs.
 *
 * @param client The guac_client associated with the current RDP session.
 *
 * @param svc
 *     The static virtual channel to add to the list of all such channels
 *     available.
 */
void guac_rdp_add_svc(guac_client* client, guac_rdp_svc* svc);

/**
 * Retrieve the SVC with the given name from the list stored in the client.
 *
 * @param client The guac_client associated with the current RDP session.
 * @param name The name of the static virtual channel to retrieve.
 *
 * @return
 *     The static virtual channel with the given name, or NULL if no such
 *     virtual channel exists.
 */
guac_rdp_svc* guac_rdp_get_svc(guac_client* client, const char* name);

/**
 * Remove the SVC with the given name from the list stored in the client.
 *
 * @param client The guac_client associated with the current RDP session.
 * @param name The name of the static virtual channel to remove.
 *
 * @return
 *     The static virtual channel that was removed, or NULL if no such virtual
 *     channel exists.
 */
guac_rdp_svc* guac_rdp_remove_svc(guac_client* client, const char* name);

/**
 * Write the given blob of data to the virtual channel.
 *
 * @param svc The static virtual channel to write data to.
 * @param data The data to write.
 * @param length The number of bytes to write.
 */
void guac_rdp_svc_write(guac_rdp_svc* svc, void* data, int length);

#endif