424 lines
10 KiB
C
424 lines
10 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol client.
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* Static Virtual Channel Interface
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*
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* Copyright 2009-2011 Jay Sorg
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* Copyright 2010-2011 Vic Lee
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <freerdp/constants.h>
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#include <freerdp/utils/memory.h>
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#include <freerdp/utils/mutex.h>
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#include <freerdp/utils/debug.h>
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#include <freerdp/utils/stream.h>
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#include <freerdp/utils/list.h>
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#include <freerdp/utils/thread.h>
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#include <freerdp/utils/event.h>
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#include <freerdp/utils/svc_plugin.h>
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/* The list of all plugin instances. */
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typedef struct rdp_svc_plugin_list rdpSvcPluginList;
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struct rdp_svc_plugin_list
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{
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rdpSvcPlugin* plugin;
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rdpSvcPluginList* next;
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};
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static rdpSvcPluginList* g_svc_plugin_list = NULL;
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/* For locking the global resources */
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static freerdp_mutex g_mutex = NULL;
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/* Queue for receiving packets */
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struct _svc_data_in_item
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{
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STREAM* data_in;
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RDP_EVENT* event_in;
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};
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typedef struct _svc_data_in_item svc_data_in_item;
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static void svc_data_in_item_free(svc_data_in_item* item)
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{
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if (item->data_in)
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{
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stream_free(item->data_in);
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item->data_in = NULL;
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}
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if (item->event_in)
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{
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freerdp_event_free(item->event_in);
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item->event_in = NULL;
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}
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xfree(item);
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}
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struct rdp_svc_plugin_private
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{
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void* init_handle;
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uint32 open_handle;
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STREAM* data_in;
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LIST* data_in_list;
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freerdp_thread* thread;
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};
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static rdpSvcPlugin* svc_plugin_find_by_init_handle(void* init_handle)
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{
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rdpSvcPluginList * list;
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rdpSvcPlugin * plugin;
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freerdp_mutex_lock(g_mutex);
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for (list = g_svc_plugin_list; list; list = list->next)
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{
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plugin = list->plugin;
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if (plugin->priv->init_handle == init_handle)
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{
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freerdp_mutex_unlock(g_mutex);
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return plugin;
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}
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}
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freerdp_mutex_unlock(g_mutex);
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return NULL;
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}
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static rdpSvcPlugin* svc_plugin_find_by_open_handle(uint32 open_handle)
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{
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rdpSvcPluginList * list;
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rdpSvcPlugin * plugin;
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freerdp_mutex_lock(g_mutex);
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for (list = g_svc_plugin_list; list; list = list->next)
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{
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plugin = list->plugin;
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if (plugin->priv->open_handle == open_handle)
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{
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freerdp_mutex_unlock(g_mutex);
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return plugin;
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}
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}
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freerdp_mutex_unlock(g_mutex);
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return NULL;
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}
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static void svc_plugin_remove(rdpSvcPlugin* plugin)
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{
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rdpSvcPluginList* list;
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rdpSvcPluginList* prev;
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/* Remove from global list */
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freerdp_mutex_lock(g_mutex);
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for (prev = NULL, list = g_svc_plugin_list; list; prev = list, list = list->next)
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{
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if (list->plugin == plugin)
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break;
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}
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if (list)
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{
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if (prev)
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prev->next = list->next;
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else
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g_svc_plugin_list = list->next;
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xfree(list);
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}
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freerdp_mutex_unlock(g_mutex);
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}
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static void svc_plugin_process_received(rdpSvcPlugin* plugin, void* pData, uint32 dataLength,
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uint32 totalLength, uint32 dataFlags)
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{
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STREAM* data_in;
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svc_data_in_item* item;
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if ( (dataFlags & CHANNEL_FLAG_SUSPEND) || (dataFlags & CHANNEL_FLAG_RESUME))
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{
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/* According to MS-RDPBCGR 2.2.6.1, "All virtual channel traffic MUST be suspended.
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This flag is only valid in server-to-client virtual channel traffic. It MUST be
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ignored in client-to-server data." Thus it would be best practice to cease data
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transmission. However, simply returing here avoids a crash. */
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return;
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}
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if (dataFlags & CHANNEL_FLAG_FIRST)
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{
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if (plugin->priv->data_in != NULL)
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stream_free(plugin->priv->data_in);
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plugin->priv->data_in = stream_new(totalLength);
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}
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data_in = plugin->priv->data_in;
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stream_check_size(data_in, (int) dataLength);
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stream_write(data_in, pData, dataLength);
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if (dataFlags & CHANNEL_FLAG_LAST)
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{
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if (stream_get_size(data_in) != stream_get_length(data_in))
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{
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printf("svc_plugin_process_received: read error\n");
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}
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plugin->priv->data_in = NULL;
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stream_set_pos(data_in, 0);
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item = xnew(svc_data_in_item);
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item->data_in = data_in;
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freerdp_thread_lock(plugin->priv->thread);
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list_enqueue(plugin->priv->data_in_list, item);
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freerdp_thread_unlock(plugin->priv->thread);
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freerdp_thread_signal(plugin->priv->thread);
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}
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}
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static void svc_plugin_process_event(rdpSvcPlugin* plugin, RDP_EVENT* event_in)
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{
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svc_data_in_item* item;
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item = xnew(svc_data_in_item);
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item->event_in = event_in;
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freerdp_thread_lock(plugin->priv->thread);
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list_enqueue(plugin->priv->data_in_list, item);
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freerdp_thread_unlock(plugin->priv->thread);
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freerdp_thread_signal(plugin->priv->thread);
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}
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static void svc_plugin_open_event(uint32 openHandle, uint32 event, void* pData, uint32 dataLength,
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uint32 totalLength, uint32 dataFlags)
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{
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rdpSvcPlugin* plugin;
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DEBUG_SVC("openHandle %d event %d dataLength %d totalLength %d dataFlags %d",
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openHandle, event, dataLength, totalLength, dataFlags);
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plugin = (rdpSvcPlugin*)svc_plugin_find_by_open_handle(openHandle);
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if (plugin == NULL)
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{
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printf("svc_plugin_open_event: error no match\n");
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return;
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}
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switch (event)
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{
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case CHANNEL_EVENT_DATA_RECEIVED:
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svc_plugin_process_received(plugin, pData, dataLength, totalLength, dataFlags);
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break;
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case CHANNEL_EVENT_WRITE_COMPLETE:
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stream_free((STREAM*)pData);
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break;
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case CHANNEL_EVENT_USER:
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svc_plugin_process_event(plugin, (RDP_EVENT*)pData);
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break;
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}
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}
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static void svc_plugin_process_data_in(rdpSvcPlugin* plugin)
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{
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svc_data_in_item* item;
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while (1)
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{
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/* terminate signal */
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if (freerdp_thread_is_stopped(plugin->priv->thread))
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break;
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freerdp_thread_lock(plugin->priv->thread);
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item = list_dequeue(plugin->priv->data_in_list);
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freerdp_thread_unlock(plugin->priv->thread);
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if (item != NULL)
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{
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/* the ownership of the data is passed to the callback */
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if (item->data_in)
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IFCALL(plugin->receive_callback, plugin, item->data_in);
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if (item->event_in)
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IFCALL(plugin->event_callback, plugin, item->event_in);
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xfree(item);
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}
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else
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break;
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}
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}
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static void* svc_plugin_thread_func(void* arg)
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{
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rdpSvcPlugin* plugin = (rdpSvcPlugin*)arg;
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DEBUG_SVC("in");
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IFCALL(plugin->connect_callback, plugin);
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while (1)
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{
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if (plugin->interval_ms > 0)
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freerdp_thread_wait_timeout(plugin->priv->thread, plugin->interval_ms);
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else
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freerdp_thread_wait(plugin->priv->thread);
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if (freerdp_thread_is_stopped(plugin->priv->thread))
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break;
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freerdp_thread_reset(plugin->priv->thread);
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svc_plugin_process_data_in(plugin);
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if (plugin->interval_ms > 0)
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IFCALL(plugin->interval_callback, plugin);
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}
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freerdp_thread_quit(plugin->priv->thread);
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DEBUG_SVC("out");
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return 0;
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}
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static void svc_plugin_process_connected(rdpSvcPlugin* plugin, void* pData, uint32 dataLength)
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{
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uint32 error;
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error = plugin->channel_entry_points.pVirtualChannelOpen(plugin->priv->init_handle,
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&plugin->priv->open_handle, plugin->channel_def.name, svc_plugin_open_event);
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if (error != CHANNEL_RC_OK)
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{
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printf("svc_plugin_process_connected: open failed\n");
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return;
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}
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plugin->priv->data_in_list = list_new();
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plugin->priv->thread = freerdp_thread_new();
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freerdp_thread_start(plugin->priv->thread, svc_plugin_thread_func, plugin);
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}
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static void svc_plugin_process_terminated(rdpSvcPlugin* plugin)
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{
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svc_data_in_item* item;
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freerdp_thread_stop(plugin->priv->thread);
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freerdp_thread_free(plugin->priv->thread);
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plugin->channel_entry_points.pVirtualChannelClose(plugin->priv->open_handle);
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xfree(plugin->channel_entry_points.pExtendedData);
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svc_plugin_remove(plugin);
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while ((item = list_dequeue(plugin->priv->data_in_list)) != NULL)
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svc_data_in_item_free(item);
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list_free(plugin->priv->data_in_list);
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if (plugin->priv->data_in != NULL)
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{
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stream_free(plugin->priv->data_in);
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plugin->priv->data_in = NULL;
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}
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xfree(plugin->priv);
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plugin->priv = NULL;
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IFCALL(plugin->terminate_callback, plugin);
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}
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static void svc_plugin_init_event(void* pInitHandle, uint32 event, void* pData, uint32 dataLength)
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{
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rdpSvcPlugin* plugin;
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DEBUG_SVC("event %d", event);
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plugin = (rdpSvcPlugin*)svc_plugin_find_by_init_handle(pInitHandle);
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if (plugin == NULL)
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{
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printf("svc_plugin_init_event: error no match\n");
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return;
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}
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switch (event)
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{
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case CHANNEL_EVENT_CONNECTED:
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svc_plugin_process_connected(plugin, pData, dataLength);
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break;
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case CHANNEL_EVENT_DISCONNECTED:
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break;
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case CHANNEL_EVENT_TERMINATED:
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svc_plugin_process_terminated(plugin);
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break;
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}
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}
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void svc_plugin_init(rdpSvcPlugin* plugin, CHANNEL_ENTRY_POINTS* pEntryPoints)
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{
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rdpSvcPluginList* list;
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/**
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* The channel manager will guarantee only one thread can call
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* VirtualChannelInit at a time. So this should be safe.
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*/
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if (g_mutex == NULL)
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g_mutex = freerdp_mutex_new();
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memcpy(&plugin->channel_entry_points, pEntryPoints, pEntryPoints->cbSize);
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plugin->priv = xnew(rdpSvcPluginPrivate);
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/* Add it to the global list */
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list = xnew(rdpSvcPluginList);
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list->plugin = plugin;
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freerdp_mutex_lock(g_mutex);
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list->next = g_svc_plugin_list;
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g_svc_plugin_list = list;
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freerdp_mutex_unlock(g_mutex);
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plugin->channel_entry_points.pVirtualChannelInit(&plugin->priv->init_handle,
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&plugin->channel_def, 1, VIRTUAL_CHANNEL_VERSION_WIN2000, svc_plugin_init_event);
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}
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int svc_plugin_send(rdpSvcPlugin* plugin, STREAM* data_out)
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{
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uint32 error = 0;
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DEBUG_SVC("length %d", stream_get_length(data_out));
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error = plugin->channel_entry_points.pVirtualChannelWrite(plugin->priv->open_handle,
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stream_get_data(data_out), stream_get_length(data_out), data_out);
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if (error != CHANNEL_RC_OK)
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{
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stream_free(data_out);
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printf("svc_plugin_send: VirtualChannelWrite failed %d\n", error);
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}
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return error;
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}
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int svc_plugin_send_event(rdpSvcPlugin* plugin, RDP_EVENT* event)
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{
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uint32 error = 0;
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DEBUG_SVC("event_type %d", event->event_type);
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error = plugin->channel_entry_points.pVirtualChannelEventPush(plugin->priv->open_handle, event);
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if (error != CHANNEL_RC_OK)
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printf("svc_plugin_send_event: VirtualChannelEventPush failed %d\n", error);
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return error;
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}
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