libfreerdp-core/channel.c

   1 /**
   2  * FreeRDP: A Remote Desktop Protocol Client
   3  * Virtual Channels
   4  *
   5  * Copyright 2011 Vic Lee
   6  *
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <freerdp/freerdp.h>
  24 #include <freerdp/peer.h>
  25 #include <freerdp/constants.h>
  26 #include <freerdp/utils/memory.h>
  27 #include <freerdp/utils/stream.h>
  28
  29 #include "rdp.h"
  30 #include "channel.h"
  31
  32 boolean freerdp_channel_send(rdpRdp* rdp, uint16 channel_id, uint8* data, int size)
  33 {
  34         STREAM* s;
  35         uint32 flags;
  36         int i, left;
  37         int chunk_size;
  38         rdpChannel* channel = NULL;
  39
  40         for (i = 0; i < rdp->settings->num_channels; i++)
  41         {
  42                 if (rdp->settings->channels[i].channel_id == channel_id)
  43                 {
  44                         channel = &rdp->settings->channels[i];
  45                         break;
  46                 }
  47         }
  48
  49         if (channel == NULL)
  50         {
  51                 printf("freerdp_channel_send: unknown channel_id %d\n", channel_id);
  52                 return false;
  53         }
  54
  55         flags = CHANNEL_FLAG_FIRST;
  56         left = size;
  57         while (left > 0)
  58         {
  59                 s = rdp_send_stream_init(rdp);
  60
  61                 if (left > (int) rdp->settings->vc_chunk_size)
  62                 {
  63                         chunk_size = rdp->settings->vc_chunk_size;
  64                 }
  65                 else
  66                 {
  67                         chunk_size = left;
  68                         flags |= CHANNEL_FLAG_LAST;
  69                 }
  70                 if ((channel->options & CHANNEL_OPTION_SHOW_PROTOCOL))
  71                 {
  72                         flags |= CHANNEL_FLAG_SHOW_PROTOCOL;
  73                 }
  74
  75                 stream_write_uint32(s, size);
  76                 stream_write_uint32(s, flags);
  77                 stream_check_size(s, chunk_size);
  78                 stream_write(s, data, chunk_size);
  79
  80                 rdp_send(rdp, s, channel_id);
  81
  82                 data += chunk_size;
  83                 left -= chunk_size;
  84                 flags = 0;
  85         }
  86
  87         return true;
  88 }
  89
  90 void freerdp_channel_process(freerdp* instance, STREAM* s, uint16 channel_id)
  91 {
  92         uint32 length;
  93         uint32 flags;
  94         int chunk_length;
  95
  96         stream_read_uint32(s, length);
  97         stream_read_uint32(s, flags);
  98         chunk_length = stream_get_left(s);
  99
 100         IFCALL(instance->ReceiveChannelData, instance,
 101                 channel_id, stream_get_tail(s), chunk_length, flags, length);
 102 }
 103
 104 void freerdp_channel_peer_process(freerdp_peer* client, STREAM* s, uint16 channel_id)
 105 {
 106         uint32 length;
 107         uint32 flags;
 108         int chunk_length;
 109
 110         stream_read_uint32(s, length);
 111         stream_read_uint32(s, flags);
 112         chunk_length = stream_get_left(s);
 113
 114         IFCALL(client->ReceiveChannelData, client,
 115                 channel_id, stream_get_tail(s), chunk_length, flags, length);
 116 }