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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 "CaptureFactory.h"
#if __MINGW32__
#define INTERLOCKED_AND8 __sync_and_and_fetch
#define INTERLOCKED_OR8 __sync_or_and_fetch
#else
#define INTERLOCKED_OR8 InterlockedOr8
#define INTERLOCKED_AND8 InterlockedAnd8
#endif
Service * Service::m_instance = NULL;
Service::Service() :
m_initialized(false),
m_memory(NULL),
m_timer(NULL),
m_capture(NULL),
m_header(NULL),
m_frameIndex(0),
m_cursorDataSize(0),
m_cursorData(NULL),
m_haveShape(false),
m_shapePending(false)
{
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())
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_header->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
m_header->version = KVMFR_HEADER_VERSION;
m_header->guestID = m_ivshmem->GetPeerID();
m_header->updateCount = 0;
// clear but retain the restart flag if it was set by the client
INTERLOCKED_AND8((char *)&m_header->flags, KVMFR_HEADER_FLAG_RESTART);
ZeroMemory(&m_header->frame , sizeof(KVMFRFrame ));
ZeroMemory(&m_header->cursor, sizeof(KVMFRCursor));
m_initialized = true;
return true;
}
bool Service::InitPointers()
{
m_header = reinterpret_cast<KVMFRHeader *>(m_memory);
m_frame[0] = (uint8_t *)(((uintptr_t)m_memory + sizeof(KVMFRHeader *) + 0x7F) & ~0x7F);
m_frameSize = ((m_ivshmem->GetSize() - (m_frame[0] - m_memory)) & ~0x7F) >> 1;
m_frame[1] = m_frame[0] + m_frameSize;
m_dataOffset[0] = m_frame[0] - m_memory;
m_dataOffset[1] = m_frame[1] - m_memory;
if (m_capture->GetMaxFrameSize() > m_frameSize)
{
DEBUG_ERROR("Frame can exceed buffer size!");
DeInitialize();
return false;
}
return true;
}
void Service::DeInitialize()
{
if (m_timer)
{
CloseHandle(m_timer);
m_timer = NULL;
}
m_haveShape = false;
m_shapePending = false;
if (m_cursorData)
{
delete[] m_cursorData;
m_cursorDataSize = 0;
m_cursorData = NULL;
}
m_header = NULL;
m_frame[0] = NULL;
m_frame[1] = NULL;
m_dataOffset[0] = 0;
m_dataOffset[1] = 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;
bool restart = false;
struct FrameInfo frame;
ZeroMemory(&frame, sizeof(FrameInfo));
frame.buffer = m_frame[m_frameIndex];
frame.bufferSize = m_frameSize;
volatile uint8_t *flags = &m_header->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)
{
m_header->updateCount = 0;
INTERLOCKED_AND8((volatile char *)flags, ~(KVMFR_HEADER_FLAG_RESTART));
restart = true;
break;
}
// check if the client has flagged it's ready
if (f & KVMFR_HEADER_FLAG_READY)
{
INTERLOCKED_AND8((volatile char *)flags, ~(KVMFR_HEADER_FLAG_READY));
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;
if (m_shapePending)
{
ok = true;
cursorOnly = true;
}
else
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 (!m_capture->ReInitialize() || !InitPointers())
{
DEBUG_ERROR("ReInitialize Failed");
return false;
}
continue;
}
if (ok)
break;
}
if (!ok)
{
DEBUG_ERROR("Capture retry count exceeded");
return false;
}
uint8_t updateFlags = 0;
m_header->cursor.flags = 0;
if (!cursorOnly)
{
// signal a frame update
updateFlags |= KVMFR_HEADER_FLAG_FRAME;
m_header->frame.type = m_capture->GetFrameType();
m_header->frame.width = frame.width;
m_header->frame.height = frame.height;
m_header->frame.stride = frame.stride;
m_header->frame.dataPos = m_dataOffset[m_frameIndex];
if (++m_frameIndex == 2)
m_frameIndex = 0;
}
if (frame.cursor.hasPos || (m_cursor.hasPos && restart))
{
if (!restart)
{
// remember the last state for client restart
m_cursor.hasPos = true;
m_cursor.visible = frame.cursor.visible;
m_cursor.x = frame.cursor.x;
m_cursor.y = frame.cursor.y;
}
// tell the host where the cursor is
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_POS;
if (m_cursor.visible)
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header->cursor.x = m_cursor.x;
m_header->cursor.y = m_cursor.y;
}
if (frame.cursor.hasShape || m_shapePending || (m_cursor.hasShape && restart))
{
if (!m_shapePending)
{
if (frame.cursor.dataSize > m_frameSize)
{
DEBUG_ERROR("Cursor size exceeds frame size! This should never happen unless your shared memory is WAY too small");
return false;
}
// take a copy of the shape information for client restarts or pending shape changes
m_cursor.hasShape = frame.cursor.hasShape;
m_cursor.type = frame.cursor.type;
m_cursor.w = frame.cursor.w;
m_cursor.h = frame.cursor.h;
m_cursor.pitch = frame.cursor.pitch;
m_cursor.dataSize = frame.cursor.dataSize;
memcpy(&m_cursor, &frame.cursor, sizeof(CursorInfo));
if (m_cursorDataSize < frame.cursor.dataSize)
{
delete[] m_cursorData;
m_cursorData = new uint8_t[frame.cursor.dataSize];
m_cursorDataSize = frame.cursor.dataSize;
}
memcpy(m_cursorData, frame.cursor.shape, frame.cursor.dataSize);
m_haveShape = true;
}
// we can't send a frame with the cursor shape as we need the buffer location
// flag it to send on the next packet
if (updateFlags & KVMFR_HEADER_FLAG_FRAME)
m_shapePending = true;
else
{
// give the host the new cursor shape
updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
if (m_cursor.visible)
m_header->cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
m_header->cursor.type = m_cursor.type;
m_header->cursor.w = m_cursor.w;
m_header->cursor.h = m_cursor.h;
m_header->cursor.pitch = m_cursor.pitch;
m_header->cursor.dataPos = m_dataOffset[m_frameIndex];
memcpy(m_frame[m_frameIndex], m_cursorData, m_cursor.dataSize);
m_shapePending = false;
if (++m_frameIndex == 2)
m_frameIndex = 0;
}
}
// update the flags
INTERLOCKED_AND8((volatile char *)flags, KVMFR_HEADER_FLAG_RESTART);
INTERLOCKED_OR8 ((volatile char *)flags, updateFlags);
// increment the update count to resume the host
++m_header->updateCount;
return true;
}
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