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xrdp-proprietary/libxrdp/xrdp_fastpath.c

210 lines
5.4 KiB

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2012
* Copyright (C) Kevin Zhou 2012
*
* Licensed 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 "libxrdp.h"
/*****************************************************************************/
struct xrdp_fastpath *APP_CC
xrdp_fastpath_create(struct xrdp_session *session)
{
struct xrdp_fastpath *self;
self = (struct xrdp_fastpath *)g_malloc(sizeof(struct xrdp_fastpath), 1);
self->tcp_layer =
((struct xrdp_rdp *)session->rdp)->sec_layer->
mcs_layer->iso_layer->tcp_layer;
make_stream(self->out_s);
init_stream(self->out_s, FASTPATH_MAX_PACKET_SIZE);
return self;
}
/*****************************************************************************/
void APP_CC
xrdp_fastpath_delete(struct xrdp_fastpath *self)
{
if (self == 0)
{
return;
}
free_stream(self->out_s);
g_free(self);
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_fastpath_reset(struct xrdp_fastpath *self)
{
return 0;
}
int APP_CC
xrdp_fastpath_init(struct xrdp_fastpath *self)
{
return 0;
}
/*****************************************************************************/
int APP_CC
xrdp_fastpath_send_update_pdu(struct xrdp_fastpath *self, tui8 updateCode,
struct stream *s)
{
tui16 len;
tui16 maxLen;
tui32 payloadLeft;
tui8 fragment;
struct stream *s_send;
int compression;
int i;
int i32;
compression = 0;
s_send = self->out_s;
maxLen = FASTPATH_MAX_PACKET_SIZE - 6; /* 6 bytes for header */
payloadLeft = (s->end - s->data);
for (i = 0; payloadLeft > 0; i++)
{
if (payloadLeft > maxLen)
{
len = maxLen;
}
else
{
len = payloadLeft;
}
payloadLeft -= len;
if (payloadLeft == 0)
{
fragment = i ? FASTPATH_FRAGMENT_LAST : FASTPATH_FRAGMENT_SINGLE;
}
else
{
fragment = i ? FASTPATH_FRAGMENT_NEXT : FASTPATH_FRAGMENT_FIRST;
}
init_stream(s_send, 0);
out_uint8(s_send, 0); /* fOutputHeader */
i32 = ((len + 6) >> 8) | 0x80;
out_uint8(s_send, i32); /* use 2 bytes for length even length < 128 ??? */
i32 = (len + 6) & 0xff;
out_uint8(s_send, i32);
i32 = (updateCode & 0x0f) | ((fragment & 0x03) << 4) |
((compression & 0x03) << 6);
out_uint8(s_send, i32);
out_uint16_le(s_send, len);
s_copy(s_send, s, len);
s_mark_end(s_send);
if (xrdp_tcp_send(self->tcp_layer, s_send) != 0)
{
return 1;
}
}
return 0;
}
/*****************************************************************************/
int
xrdp_fastpath_process_update(struct xrdp_fastpath *self, tui8 updateCode,
tui32 size, struct stream *s)
{
switch (updateCode)
{
case FASTPATH_UPDATETYPE_ORDERS:
case FASTPATH_UPDATETYPE_BITMAP:
case FASTPATH_UPDATETYPE_PALETTE:
case FASTPATH_UPDATETYPE_SYNCHRONIZE:
case FASTPATH_UPDATETYPE_SURFCMDS:
case FASTPATH_UPDATETYPE_PTR_NULL:
case FASTPATH_UPDATETYPE_PTR_DEFAULT:
case FASTPATH_UPDATETYPE_PTR_POSITION:
case FASTPATH_UPDATETYPE_COLOR:
case FASTPATH_UPDATETYPE_CACHED:
case FASTPATH_UPDATETYPE_POINTER:
break;
default:
g_writeln("xrdp_fastpath_process_update: unknown updateCode 0x%X",
updateCode);
break;
}
return 0;
}
/*****************************************************************************/
int APP_CC
xrdp_fastpath_process_data(struct xrdp_fastpath *self, struct stream *s,
tui8 header)
{
tui8 encryptionFlags;
tui8 numberEvents;
tui8 length2;
tui8 updateHeader;
tui8 updateCode;
tui8 updateFrag;
tui8 updateComp;
tui16 length;
tui32 size;
encryptionFlags = (header & 0xc0) >> 6;
numberEvents = (header & 0x3c) >> 2;
xrdp_tcp_recv(self->tcp_layer, s, 1);
in_uint8(s, length);
if (length & 0x80)
{
xrdp_tcp_recv(self->tcp_layer, s, 1);
in_uint8(s, length2);
length = (length & 0x7f) << 8 + length2 - 3;
}
else
{
length -= 2;
}
xrdp_tcp_recv(self->tcp_layer, s, length);
if (encryptionFlags != 0)
{
/* TODO decryption ...*/
}
/* parse updateHeader */
in_uint8(s, updateHeader);
updateCode = (updateHeader & 0x0f);
updateFrag = (updateHeader & 0x30) >> 4;
updateComp = (updateHeader & 0xc0) >> 6;
if (updateFrag && updateComp)
{
/* TODO */
g_writeln("xrdp_fastpath_process_data: updateFrag=%d, updateComp=%d",
updateFrag, updateComp);
return 1;
}
in_uint16_le(s, size);
return xrdp_fastpath_process_update(self, updateCode, size, s);
}