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LookingGlass/host/Service.cpp

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/*
Looking Glass - KVM FrameRelay (KVMFR) Client
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
https://looking-glass.hostfission.com
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "Service.h"
#include "IVSHMEM.h"
#include "common/debug.h"
#include "common/KVMFR.h"
#include "Util.h"
#include "CaptureFactory.h"
Service * Service::m_instance = NULL;
Service::Service() :
m_initialized(false),
m_memory(NULL),
m_timer(NULL),
m_capture(NULL),
m_shmHeader(NULL),
m_frameIndex(0),
m_cursorDataSize(0),
m_cursorData(NULL)
{
m_consoleSessionID = WTSGetActiveConsoleSessionId();
m_ivshmem = IVSHMEM::Get();
}
Service::~Service()
{
}
bool Service::Initialize(ICapture * captureDevice)
{
if (m_initialized)
DeInitialize();
m_capture = captureDevice;
if (!m_ivshmem->Initialize())
{
DEBUG_ERROR("IVSHMEM failed to initalize");
DeInitialize();
return false;
}
if (m_ivshmem->GetSize() < sizeof(KVMFRHeader))
{
DEBUG_ERROR("Shared memory is not large enough for the KVMFRHeader");
DeInitialize();
return false;
}
m_memory = static_cast<uint8_t*>(m_ivshmem->GetMemory());
if (!m_memory)
{
DEBUG_ERROR("Failed to get IVSHMEM memory");
DeInitialize();
return false;
}
if (!InitPointers())
{
DeInitialize();
return false;
}
if (m_capture->GetMaxFrameSize() > m_frameSize)
{
DEBUG_ERROR("Maximum frame size of %zu bytes excceds maximum space available", m_capture->GetMaxFrameSize());
DeInitialize();
return false;
}
m_timer = CreateWaitableTimer(NULL, TRUE, NULL);
if (!m_timer)
{
DEBUG_ERROR("Failed to create waitable timer");
return false;
}
// update everything except for the hostID
memcpy(m_shmHeader->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
m_shmHeader->version = KVMFR_HEADER_VERSION;
// clear but retain the restart flag if it was set by the client
INTERLOCKED_AND8((char *)&m_shmHeader->flags, KVMFR_HEADER_FLAG_RESTART);
ZeroMemory(&m_shmHeader->detail, sizeof(KVMFRDetail));
m_initialized = true;
return true;
}
#define ALIGN_DN(x) ((uintptr_t)(x) & ~0x7F)
#define ALIGN_UP(x) ALIGN_DN(x + 0x7F)
bool Service::InitPointers()
{
m_shmHeader = reinterpret_cast<KVMFRHeader *>(m_memory);
m_cursorData = (uint8_t *)ALIGN_UP(m_memory + sizeof(KVMFRHeader));
m_cursorDataSize = 1048576; // 1MB fixed for cursor size, should be more then enough
m_frame[0] = (uint8_t *)ALIGN_UP(m_cursorData + m_cursorDataSize);
m_frameSize = ALIGN_DN((m_ivshmem->GetSize() - (m_frame[0] - m_memory)) >> 1);
m_frame[1] = (uint8_t *)ALIGN_DN(m_frame[0] + m_frameSize);
m_cursorOffset = m_cursorData - m_memory;
m_dataOffset[0] = m_frame[0] - m_memory;
m_dataOffset[1] = m_frame[1] - m_memory;
DEBUG_INFO("Total Available : %3I64u MB", m_ivshmem->GetSize() / 1024 / 1024);
DEBUG_INFO("Max Cursor Size : %3I64u MB", m_cursorDataSize / 1024 / 1024);
DEBUG_INFO("Max Frame Size : %3I64u MB", m_frameSize / 1024 / 1024);
DEBUG_INFO("Cursor : %p (0x%08I64x)", m_cursorData, m_cursorOffset );
DEBUG_INFO("Frame 1 : %p (0x%08I64x)", m_frame[0] , m_dataOffset[0]);
DEBUG_INFO("Frame 2 : %p (0x%08I64x)", m_frame[1] , m_dataOffset[1]);
return true;
}
void Service::DeInitialize()
{
if (m_timer)
{
CloseHandle(m_timer);
m_timer = NULL;
}
m_shmHeader = NULL;
m_cursorData = NULL;
m_frame[0] = NULL;
m_frame[1] = NULL;
m_cursorOffset = 0;
m_dataOffset[0] = 0;
m_dataOffset[1] = 0;
m_cursorDataSize = 0;
m_frameSize = 0;
m_ivshmem->DeInitialize();
if (m_capture)
{
m_capture->DeInitialize();
m_capture = NULL;
}
m_memory = NULL;
m_initialized = false;
}
bool Service::Process()
{
if (!m_initialized)
return false;
struct FrameInfo frame;
ZeroMemory(&frame, sizeof(FrameInfo));
frame.buffer = m_frame[m_frameIndex];
frame.bufferSize = m_frameSize;
volatile uint8_t *flags = &m_shmHeader->flags;
// wait for the host to notify that is it is ready to proceed
while (true)
{
const uint8_t f = *flags;
// check if the client has flagged a restart
if (f & KVMFR_HEADER_FLAG_RESTART)
{
DEBUG_INFO("Restart Requested");
if (!m_capture->ReInitialize())
{
DEBUG_ERROR("ReInitialize Failed");
return false;
}
if (m_capture->GetMaxFrameSize() > m_frameSize)
{
DEBUG_ERROR("Maximum frame size of %zd bytes excceds maximum space available", m_capture->GetMaxFrameSize());
return false;
}
INTERLOCKED_AND8((volatile char *)flags, ~(KVMFR_HEADER_FLAG_RESTART));
break;
}
// check if the client has flagged it's ready
if (!(f & KVMFR_HEADER_FLAG_FRAME))
break;
// wait for 100ns before polling again
LARGE_INTEGER timeout;
timeout.QuadPart = -100;
if (!SetWaitableTimer(m_timer, &timeout, 0, NULL, NULL, FALSE))
{
DEBUG_ERROR("Failed to set waitable timer");
return false;
}
WaitForSingleObject(m_timer, INFINITE);
}
bool ok = false;
bool cursorOnly = false;
for(int i = 0; i < 2; ++i)
{
// capture a frame of data
switch (m_capture->GrabFrame(frame))
{
case GRAB_STATUS_OK:
ok = true;
break;
case GRAB_STATUS_CURSOR:
ok = true;
cursorOnly = true;
break;
case GRAB_STATUS_ERROR:
DEBUG_ERROR("Capture failed");
return false;
case GRAB_STATUS_REINIT:
DEBUG_INFO("ReInitialize Requested");
if(WTSGetActiveConsoleSessionId() != m_consoleSessionID)
{
DEBUG_INFO("User switch detected, waiting to regain control");
while (WTSGetActiveConsoleSessionId() != m_consoleSessionID)
Sleep(100);
}
if (!m_capture->ReInitialize())
{
DEBUG_ERROR("ReInitialize Failed");
return false;
}
if (m_capture->GetMaxFrameSize() > m_frameSize)
{
DEBUG_ERROR("Maximum frame size of %zd bytes excceds maximum space available", m_capture->GetMaxFrameSize());
return false;
}
continue;
}
if (ok)
break;
}
if (!ok)
{
DEBUG_ERROR("Capture retry count exceeded");
return false;
}
uint8_t updateFlags = 0;
if (!cursorOnly)
{
// signal a frame update
updateFlags |= KVMFR_HEADER_FLAG_FRAME;
m_detail.frame.type = m_capture->GetFrameType();
m_detail.frame.width = frame.width;
m_detail.frame.height = frame.height;
m_detail.frame.stride = frame.stride;
m_detail.frame.pitch = frame.pitch;
m_detail.frame.dataPos = m_dataOffset[m_frameIndex];
if (++m_frameIndex == 2)
m_frameIndex = 0;
}
if (frame.cursor.hasPos)
{
// tell the host where the cursor is
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_detail.cursor.flags |= KVMFR_CURSOR_FLAG_POS;
m_detail.cursor.x = frame.cursor.x;
m_detail.cursor.y = frame.cursor.y;
if (frame.cursor.visible)
m_detail.cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
else
m_detail.cursor.flags &= ~KVMFR_CURSOR_FLAG_VISIBLE;
}
if (frame.cursor.hasShape)
{
if (frame.cursor.dataSize > m_cursorDataSize)
{
DEBUG_ERROR("Cursor size exceeds allocated space");
return false;
}
// give the host the new cursor shape
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_detail.cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
++m_detail.cursor.version;
m_detail.cursor.type = frame.cursor.type;
m_detail.cursor.width = frame.cursor.w;
m_detail.cursor.height = frame.cursor.h;
m_detail.cursor.pitch = frame.cursor.pitch;
m_detail.cursor.dataPos = m_cursorOffset;
memcpy(m_cursorData, frame.cursor.shape, frame.cursor.dataSize);
}
// update the shared details only
memcpy(&m_shmHeader->detail, &m_detail, sizeof(KVMFRDetail));
// update the flags
INTERLOCKED_AND8((volatile char *)flags, KVMFR_HEADER_FLAG_RESTART);
INTERLOCKED_OR8 ((volatile char *)flags, updateFlags);
_mm_sfence();
return true;
}
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