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Improve server time sync

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Prevents cheating with time based puzzles (pellets) and ensures the KI time
stays somewhat correct. The server time will be reset on the plNetMessage
received after the user changes their system clock. That might take a bit,
but it's better than nothing.
This commit is contained in:
Adam Johnson
2012-03-04 21:10:34 -05:00
parent a753532f77
commit 638259e749
3 changed files with 13 additions and 4 deletions
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10
Sources/Plasma/Apps/plClient/winmain.cpp
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@ -366,7 +366,15 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
static uint32_t keyState=0; static uint32_t keyState=0;
// Handle messages // Handle messages
switch (message) { switch (message) {
case WM_TIMECHANGE:
// To prevent cheating and keep things better synchronized,
// we will completely re-eval the offsets on the next NetMsg we
// get from the server
if (plNetClientMgr* nc = plNetClientMgr::GetInstance())
nc->ResetServerTimeOffset(true);
break;
case WM_KEYDOWN : case WM_KEYDOWN :
case WM_LBUTTONDOWN : case WM_LBUTTONDOWN :
case WM_RBUTTONDOWN : case WM_RBUTTONDOWN :

5
Sources/Plasma/PubUtilLib/plNetClient/plNetClientMgr.cpp
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@ -506,9 +506,10 @@ void plNetClientMgr::UpdateServerTimeOffset(plNetMessage* msg)
} }
} }
void plNetClientMgr::ResetServerTimeOffset() void plNetClientMgr::ResetServerTimeOffset(bool delayed)
{ {
fServerTimeOffset = 0; if (!delayed)
fServerTimeOffset = 0;
fTimeSamples = 0; fTimeSamples = 0;
fLastTimeUpdate = 0; fLastTimeUpdate = 0;
} }

2
Sources/Plasma/PubUtilLib/plNetClient/plNetClientMgr.h
View File

@ -383,7 +383,7 @@ public:
void StoreSDLState(const plStateDataRecord* sdRec, const plUoid& uoid, uint32_t sendFlags, uint32_t writeOptions); void StoreSDLState(const plStateDataRecord* sdRec, const plUoid& uoid, uint32_t sendFlags, uint32_t writeOptions);
void UpdateServerTimeOffset(plNetMessage* msg); void UpdateServerTimeOffset(plNetMessage* msg);
void ResetServerTimeOffset(); void ResetServerTimeOffset(bool delayed=false);
private: private:
plNetClientComm fNetClientComm; plNetClientComm fNetClientComm;