mirror of
https://github.com/gnif/LookingGlass.git
synced 2024-09-20 09:21:33 +00:00
306 lines
7.6 KiB
C++
306 lines
7.6 KiB
C++
/*
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Looking Glass - KVM FrameRelay (KVMFR) Client
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Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "Service.h"
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#include "IVSHMEM.h"
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#include "common/debug.h"
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#include "common/KVMFR.h"
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#include "CaptureFactory.h"
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#if __MINGW32__
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#define INTERLOCKED_AND8 __sync_and_and_fetch
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#define INTERLOCKED_OR8 __sync_or_and_fetch
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#else
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#define INTERLOCKED_OR8 InterlockedOr8
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#define INTERLOCKED_AND8 InterlockedAnd8
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#endif
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Service * Service::m_instance = NULL;
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Service::Service() :
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m_initialized(false),
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m_memory(NULL),
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m_timer(NULL),
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m_capture(NULL),
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m_shmHeader(NULL),
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m_frameIndex(0),
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m_cursorDataSize(0),
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m_cursorData(NULL)
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{
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m_consoleSessionID = WTSGetActiveConsoleSessionId();
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m_ivshmem = IVSHMEM::Get();
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}
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Service::~Service()
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{
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}
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bool Service::Initialize(ICapture * captureDevice)
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{
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if (m_initialized)
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DeInitialize();
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m_capture = captureDevice;
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if (!m_ivshmem->Initialize())
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{
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DEBUG_ERROR("IVSHMEM failed to initalize");
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DeInitialize();
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return false;
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}
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if (m_ivshmem->GetSize() < sizeof(KVMFRHeader))
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{
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DEBUG_ERROR("Shared memory is not large enough for the KVMFRHeader");
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DeInitialize();
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return false;
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}
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m_memory = static_cast<uint8_t*>(m_ivshmem->GetMemory());
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if (!m_memory)
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{
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DEBUG_ERROR("Failed to get IVSHMEM memory");
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DeInitialize();
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return false;
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}
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if (!InitPointers())
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return false;
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m_timer = CreateWaitableTimer(NULL, TRUE, NULL);
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if (!m_timer)
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{
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DEBUG_ERROR("Failed to create waitable timer");
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return false;
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}
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// update everything except for the hostID
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memcpy(m_shmHeader->magic, KVMFR_HEADER_MAGIC, sizeof(KVMFR_HEADER_MAGIC));
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m_shmHeader->version = KVMFR_HEADER_VERSION;
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// clear but retain the restart flag if it was set by the client
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INTERLOCKED_AND8((char *)&m_shmHeader->flags, KVMFR_HEADER_FLAG_RESTART);
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ZeroMemory(&m_shmHeader->detail, sizeof(KVMFRDetail));
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m_initialized = true;
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return true;
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}
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bool Service::InitPointers()
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{
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m_shmHeader = reinterpret_cast<KVMFRHeader *>(m_memory);
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m_cursorData = (uint8_t *)(((uintptr_t)m_memory + sizeof(KVMFRHeader *) + 0x7F) & ~0x7F);
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m_cursorDataSize = (128 * 128 * 4);
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m_frame[0] = m_cursorData + (128*128*4);
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m_frameSize = ((m_ivshmem->GetSize() - (m_frame[0] - m_memory)) & ~0x7F) >> 1;
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m_frame[1] = m_frame[0] + m_frameSize;
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m_cursorOffset = m_cursorData - m_memory;
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m_dataOffset[0] = m_frame[0] - m_memory;
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m_dataOffset[1] = m_frame[1] - m_memory;
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if (m_capture->GetMaxFrameSize() > m_frameSize)
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{
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DEBUG_ERROR("Frame can exceed buffer size!");
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DeInitialize();
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return false;
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}
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return true;
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}
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void Service::DeInitialize()
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{
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if (m_timer)
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{
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CloseHandle(m_timer);
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m_timer = NULL;
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}
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m_shmHeader = NULL;
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m_cursorData = NULL;
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m_frame[0] = NULL;
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m_frame[1] = NULL;
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m_cursorOffset = 0;
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m_dataOffset[0] = 0;
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m_dataOffset[1] = 0;
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m_cursorDataSize = 0;
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m_frameSize = 0;
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m_ivshmem->DeInitialize();
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if (m_capture)
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{
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m_capture->DeInitialize();
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m_capture = NULL;
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}
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m_memory = NULL;
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m_initialized = false;
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}
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bool Service::Process()
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{
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if (!m_initialized)
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return false;
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bool restart = false;
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struct FrameInfo frame;
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ZeroMemory(&frame, sizeof(FrameInfo));
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frame.buffer = m_frame[m_frameIndex];
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frame.bufferSize = m_frameSize;
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volatile uint8_t *flags = &m_shmHeader->flags;
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// wait for the host to notify that is it is ready to proceed
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while (true)
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{
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const uint8_t f = *flags;
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// check if the client has flagged a restart
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if (f & KVMFR_HEADER_FLAG_RESTART)
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{
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INTERLOCKED_AND8((volatile char *)flags, ~(KVMFR_HEADER_FLAG_RESTART));
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restart = true;
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break;
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}
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// check if the client has flagged it's ready
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if (!(f & KVMFR_HEADER_FLAG_FRAME))
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break;
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// wait for 100ns before polling again
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LARGE_INTEGER timeout;
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timeout.QuadPart = -100;
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if (!SetWaitableTimer(m_timer, &timeout, 0, NULL, NULL, FALSE))
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{
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DEBUG_ERROR("Failed to set waitable timer");
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return false;
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}
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WaitForSingleObject(m_timer, INFINITE);
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}
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bool ok = false;
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bool cursorOnly = false;
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for(int i = 0; i < 2; ++i)
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{
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// capture a frame of data
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switch (m_capture->GrabFrame(frame))
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{
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case GRAB_STATUS_OK:
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ok = true;
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break;
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case GRAB_STATUS_CURSOR:
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ok = true;
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cursorOnly = true;
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break;
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case GRAB_STATUS_ERROR:
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DEBUG_ERROR("Capture failed");
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return false;
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case GRAB_STATUS_REINIT:
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DEBUG_INFO("ReInitialize Requested");
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if(WTSGetActiveConsoleSessionId() != m_consoleSessionID)
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{
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DEBUG_INFO("User switch detected, waiting to regain control");
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while (WTSGetActiveConsoleSessionId() != m_consoleSessionID)
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Sleep(100);
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}
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if (!m_capture->ReInitialize() || !InitPointers())
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{
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DEBUG_ERROR("ReInitialize Failed");
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return false;
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}
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continue;
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}
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if (ok)
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break;
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}
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if (!ok)
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{
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DEBUG_ERROR("Capture retry count exceeded");
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return false;
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}
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uint8_t updateFlags = 0;
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if (!cursorOnly)
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{
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// signal a frame update
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updateFlags |= KVMFR_HEADER_FLAG_FRAME;
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m_detail.frame.type = m_capture->GetFrameType();
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m_detail.frame.width = frame.width;
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m_detail.frame.height = frame.height;
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m_detail.frame.stride = frame.stride;
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m_detail.frame.pitch = frame.pitch;
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m_detail.frame.dataPos = m_dataOffset[m_frameIndex];
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if (++m_frameIndex == 2)
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m_frameIndex = 0;
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}
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if (frame.cursor.hasPos)
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{
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// tell the host where the cursor is
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updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
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m_detail.cursor.flags |= KVMFR_CURSOR_FLAG_POS;
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m_detail.cursor.x = frame.cursor.x;
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m_detail.cursor.y = frame.cursor.y;
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if (frame.cursor.visible)
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m_detail.cursor.flags |= KVMFR_CURSOR_FLAG_VISIBLE;
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else
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m_detail.cursor.flags &= ~KVMFR_CURSOR_FLAG_VISIBLE;
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}
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if (frame.cursor.hasShape)
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{
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if (frame.cursor.dataSize > m_cursorDataSize)
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{
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DEBUG_ERROR("Cursor size exceeds allocated space");
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return false;
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}
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// give the host the new cursor shape
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updateFlags |= KVMFR_HEADER_FLAG_CURSOR;
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m_detail.cursor.flags |= KVMFR_CURSOR_FLAG_SHAPE;
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++m_detail.cursor.version;
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m_detail.cursor.type = frame.cursor.type;
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m_detail.cursor.width = frame.cursor.w;
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m_detail.cursor.height = frame.cursor.h;
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m_detail.cursor.pitch = frame.cursor.pitch;
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m_detail.cursor.dataPos = m_cursorOffset;
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memcpy(m_cursorData, frame.cursor.shape, frame.cursor.dataSize);
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}
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// update the shared details only
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memcpy(&m_shmHeader->detail, &m_detail, sizeof(KVMFRDetail));
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// update the flags
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INTERLOCKED_AND8((volatile char *)flags, KVMFR_HEADER_FLAG_RESTART);
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INTERLOCKED_OR8 ((volatile char *)flags, updateFlags);
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return true;
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} |