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xrdp/libxrdp/xrdp_fastpath.c

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2012-2014
* Copyright (C) Idan Freiberg 2013-2014
*
* 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.
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "libxrdp.h"
#include "ms-rdpbcgr.h"
/*****************************************************************************/
struct xrdp_fastpath *
xrdp_fastpath_create(struct xrdp_sec *owner, struct trans *trans)
{
struct xrdp_fastpath *self;
self = (struct xrdp_fastpath *)g_malloc(sizeof(struct xrdp_fastpath), 1);
self->sec_layer = owner;
self->trans = trans;
self->session = owner->rdp_layer->session;
return self;
}
/*****************************************************************************/
void
xrdp_fastpath_delete(struct xrdp_fastpath *self)
{
if (self == 0)
{
return;
}
g_free(self);
}
/*****************************************************************************/
int
xrdp_fastpath_recv(struct xrdp_fastpath *self, struct stream *s)
{
int fp_hdr;
int len = 0;
int byte;
char *holdp;
holdp = s->p;
if (!s_check_rem_and_log(s, 2, "Parsing [MS-RDPBCGR] TS_FP_INPUT_PDU"))
{
return 1;
}
in_uint8(s, fp_hdr); /* fpInputHeader (1 byte) */
in_uint8(s, byte); /* length 1 (1 byte) */
self->numEvents = (fp_hdr & 0x3C) >> 2;
self->secFlags = (fp_hdr & 0xC0) >> 6;
if (byte & 0x80)
{
byte &= ~(0x80);
len = (byte << 8);
if (!s_check_rem_and_log(s, 1, "Parsing [MS-RDPBCGR] TS_FP_INPUT_PDU length2"))
{
return 1;
}
in_uint8(s, byte); /* length 2 (1 byte) */
len += byte;
}
else
{
len = byte;
}
s->next_packet = holdp + len;
LOG_DEVEL(LOG_LEVEL_TRACE, "Received header [MS-RDPBCGR] TS_FP_INPUT_PDU "
"fpInputHeader.action (ignored), fpInputHeader.numEvents %d, "
"fpInputHeader.flags 0x%1.1x, length %d",
self->numEvents, self->secFlags, len);
return 0;
}
/*****************************************************************************/
/* no fragmentation */
int
xrdp_fastpath_init(struct xrdp_fastpath *self, struct stream *s)
{
int bytes;
bytes = self->session->client_info->max_fastpath_frag_bytes;
if (bytes < 32 * 1024)
{
bytes = 32 * 1024;
}
init_stream(s, bytes);
return 0;
}
/*****************************************************************************/
static int
xrdp_fastpath_session_callback(struct xrdp_fastpath *self, int msg,
long param1, long param2,
long param3, long param4)
{
if (self->session->callback != 0)
{
/* msg_type can be
RDP_INPUT_SYNCHRONIZE - 0
RDP_INPUT_SCANCODE - 4
RDP_INPUT_MOUSE - 0x8001
RDP_INPUT_MOUSEX - 0x8002 */
/* call to xrdp_wm.c : callback */
self->session->callback(self->session->id, msg,
param1, param2, param3, param4);
}
else
{
LOG_DEVEL(LOG_LEVEL_WARNING, "Bug: session is NULL");
}
return 0;
}
/*****************************************************************************/
/* no fragmentation */
int
xrdp_fastpath_send(struct xrdp_fastpath *self, struct stream *s)
{
if (trans_write_copy_s(self->trans, s) != 0)
{
return 1;
}
if (self->session->check_for_app_input)
{
xrdp_fastpath_session_callback(self, 0x5556, 0, 0, 0, 0);
}
return 0;
}
/*****************************************************************************/
/**
* Converts the fastpath keyboard event flags to slowpath event flags
* @param Faspath flags
* @return slowpath flags
*
* See [MMS-RDPBCGR] 2.2.8.1.1.3.1.1.1 and 2.2.8.1.2.2.1
*/
static int
get_slowpath_keyboard_event_flags(int fp_flags)
{
int flags = 0;
if (fp_flags & FASTPATH_INPUT_KBDFLAGS_RELEASE)
{
// Assume the key was down prior to this event - the fastpath
// message doesn't have a separate flag which maps to
// KBDFLAGS_DOWN
flags |= KBDFLAGS_DOWN | KBDFLAGS_RELEASE;
}
if (fp_flags & FASTPATH_INPUT_KBDFLAGS_EXTENDED)
{
flags |= KBDFLAGS_EXTENDED;
}
if (fp_flags & FASTPATH_INPUT_KBDFLAGS_EXTENDED1)
{
flags |= KBDFLAGS_EXTENDED1;
}
return flags;
}
/*****************************************************************************/
/* FASTPATH_INPUT_EVENT_SCANCODE */
static int
xrdp_fastpath_process_EVENT_SCANCODE(struct xrdp_fastpath *self,
int eventFlags, struct stream *s)
{
int flags;
int code;
if (!s_check_rem_and_log(s, 1, "Parsing [MS-RDPBCGR] TS_FP_KEYBOARD_EVENT"))
{
return 1;
}
in_uint8(s, code); /* keyCode (1 byte) */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FP_KEYBOARD_EVENT "
"eventHeader.eventFlags 0x%2.2x, eventHeader.eventCode (ignored), "
"keyCode %d", eventFlags, code);
flags = get_slowpath_keyboard_event_flags(eventFlags);
xrdp_fastpath_session_callback(self, RDP_INPUT_SCANCODE,
code, 0, flags, 0);
return 0;
}
/*****************************************************************************/
/* FASTPATH_INPUT_EVENT_MOUSE */
static int
xrdp_fastpath_process_EVENT_MOUSE(struct xrdp_fastpath *self,
int eventFlags, struct stream *s)
{
int pointerFlags;
int xPos;
int yPos;
/* eventFlags MUST be zeroed out */
if (eventFlags != 0)
{
return 1;
}
if (!s_check_rem_and_log(s, 2 + 2 + 2, "Parsing [MS-RDPBCGR] TS_FP_POINTER_EVENT"))
{
return 1;
}
in_uint16_le(s, pointerFlags); /* pointerFlags (2 bytes) */
in_uint16_le(s, xPos); /* xPos (2 bytes) */
in_uint16_le(s, yPos); /* yPos (2 bytes) */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FP_POINTER_EVENT "
"eventHeader.eventFlags 0x00, eventHeader.eventCode (ignored), "
"pointerFlags 0x%4.4x, xPos %d, yPos %d", pointerFlags, xPos, yPos);
xrdp_fastpath_session_callback(self, RDP_INPUT_MOUSE,
xPos, yPos, pointerFlags, 0);
return 0;
}
/*****************************************************************************/
/* FASTPATH_INPUT_EVENT_MOUSEX */
static int
xrdp_fastpath_process_EVENT_MOUSEX(struct xrdp_fastpath *self,
int eventFlags, struct stream *s)
{
int pointerFlags;
int xPos;
int yPos;
/* eventFlags MUST be zeroed out */
if (eventFlags != 0)
{
return 1;
}
if (!s_check_rem_and_log(s, 2 + 2 + 2,
"Parsing [MS-RDPBCGR] TS_FP_POINTERX_EVENT"))
{
return 1;
}
in_uint16_le(s, pointerFlags); /* pointerFlags (2 bytes) */
in_uint16_le(s, xPos); /* xPos (2 bytes) */
in_uint16_le(s, yPos); /* yPos (2 bytes) */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FP_POINTERX_EVENT "
"eventHeader.eventFlags 0x%2.2x, eventHeader.eventCode (ignored), "
"pointerFlags 0x%4.4x, xPos %d, yPos %d",
eventFlags, pointerFlags, xPos, yPos);
xrdp_fastpath_session_callback(self, RDP_INPUT_MOUSEX,
xPos, yPos, pointerFlags, 0);
return 0;
}
/*****************************************************************************/
/* FASTPATH_INPUT_EVENT_SYNC */
static int
xrdp_fastpath_process_EVENT_SYNC(struct xrdp_fastpath *self,
int eventFlags, struct stream *s)
{
/*
* The eventCode bitfield (3 bits in size) MUST be set to
* FASTPATH_INPUT_EVENT_SYNC (3).
* The eventFlags bitfield (5 bits in size) contains flags
* indicating the "on"
* status of the keyboard toggle keys.
*/
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FP_SYNC_EVENT"
"eventHeader.eventFlags 0x%2.2x, eventHeader.eventCode (ignored), ",
eventFlags);
xrdp_fastpath_session_callback(self, RDP_INPUT_SYNCHRONIZE,
eventFlags, 0, 0, 0);
return 0;
}
/*****************************************************************************/
/* FASTPATH_INPUT_EVENT_UNICODE */
static int
xrdp_fastpath_process_EVENT_UNICODE(struct xrdp_fastpath *self,
int eventFlags, struct stream *s)
{
int flags;
int code;
if (!s_check_rem_and_log(s, 2, "Parsing [MS-RDPBCGR] TS_FP_UNICODE_KEYBOARD_EVENT"))
{
return 1;
}
in_uint16_le(s, code); /* unicode (2 byte) */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FP_UNICODE_KEYBOARD_EVENT"
"eventHeader.eventFlags 0x%2.2x, eventHeader.eventCode (ignored), "
"unicodeCode %d",
eventFlags, code);
flags = get_slowpath_keyboard_event_flags(eventFlags);
xrdp_fastpath_session_callback(self, RDP_INPUT_UNICODE,
code, 0, flags, 0);
return 0;
}
/*****************************************************************************/
/* FASTPATH_INPUT_EVENT */
int
xrdp_fastpath_process_input_event(struct xrdp_fastpath *self,
struct stream *s)
{
int i;
int eventHeader;
int eventCode;
int eventFlags;
/* process fastpath input events */
for (i = 0; i < self->numEvents; i++)
{
if (!s_check_rem_and_log(s, 1, "Parsing [MS-RDPBCGR] TS_FP_INPUT_EVENT eventHeader"))
{
return 1;
}
in_uint8(s, eventHeader);
eventFlags = (eventHeader & 0x1F);
eventCode = (eventHeader >> 5);
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FP_INPUT_EVENT"
"eventHeader.eventFlags 0x%2.2x, eventHeader.eventCode 0x%1.1x",
eventFlags, eventCode);
switch (eventCode)
{
case FASTPATH_INPUT_EVENT_SCANCODE:
if (xrdp_fastpath_process_EVENT_SCANCODE(self,
eventFlags,
s) != 0)
{
return 1;
}
break;
case FASTPATH_INPUT_EVENT_MOUSE:
if (xrdp_fastpath_process_EVENT_MOUSE(self,
eventFlags,
s) != 0)
{
return 1;
}
break;
case FASTPATH_INPUT_EVENT_MOUSEX:
if (xrdp_fastpath_process_EVENT_MOUSEX(self,
eventFlags,
s) != 0)
{
return 1;
}
break;
case FASTPATH_INPUT_EVENT_SYNC:
if (xrdp_fastpath_process_EVENT_SYNC(self,
eventFlags,
s) != 0)
{
return 1;
}
break;
case FASTPATH_INPUT_EVENT_UNICODE:
if (xrdp_fastpath_process_EVENT_UNICODE(self,
eventFlags,
s) != 0)
{
return 1;
}
break;
default:
LOG(LOG_LEVEL_ERROR, "xrdp_fastpath_process_input_event: "
"unknown eventCode %d", eventCode);
break;
}
}
return 0;
}
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