317 lines
11 KiB
C++
317 lines
11 KiB
C++
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/*****************************************************************************
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*
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* ftp.cpp - FTP folder bookkeeping
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*
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*****************************************************************************/
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#include "priv.h"
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#include "ftpinet.h"
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#include "ftpsite.h"
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#include "ftplist.h"
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#include "msieftp.h"
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#include "cookie.h"
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extern CFtpList * g_FtpSiteCache;
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extern DWORD g_dwOpenConnections;
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/*****************************************************************************
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*
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* Dynamic Globals. There should be as few of these as possible.
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*
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* All access to dynamic globals must be thread-safe.
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*
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*****************************************************************************/
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ULONG g_cRef = 0; /* Global reference count */
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CRITICAL_SECTION g_csDll; /* The shared critical section */
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extern HANDLE g_hthWorker; // Background worker thread
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#ifdef DEBUG
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DWORD g_TlsMem = 0xffffffff;
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extern DWORD g_TLSliStopWatchStartHi;
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extern DWORD g_TLSliStopWatchStartLo;
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LEAKSTRUCT g_LeakList[] =
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{
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{0, "CFtpFolder"},
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{0, "CFtpDir"},
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{0, "CFtpSite"},
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{0, "CFtpObj"},
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{0, "CFtpEidl"},
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{0, "CFtpDrop"},
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{0, "CFtpList"},
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{0, "CFtpStm"},
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{0, "CAccount"},
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{0, "CFtpFactory"},
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{0, "CFtpContextMenu"},
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{0, "CFtpEfe"},
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{0, "CFtpGlob"},
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{0, "CFtpIcon"},
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{0, "CMallocItem"},
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{0, "CFtpPidlList"},
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{0, "CFtpProp"},
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{0, "CStatusBar"},
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{0, "CFtpView"},
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{0, "CFtpWebView"},
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{0, "CCookieList"},
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{0, "CDropOperation"}
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};
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#endif // DEBUG
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ULONG g_cRef_CFtpView = 0; // Needed to determine when to purge cache.
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/*****************************************************************************
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*
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* DllAddRef / DllRelease
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*
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* Maintain the DLL reference count.
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*
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*****************************************************************************/
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void DllAddRef(void)
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{
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CREATE_CALLERS_ADDRESS; // For debug spew.
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InterlockedIncrement((LPLONG)&g_cRef);
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TraceMsg(TF_FTPREF, "DllAddRef() g_cRef=%d, called from=%#08lx.", g_cRef, GET_CALLERS_ADDRESS);
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}
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void DllRelease(void)
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{
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CREATE_CALLERS_ADDRESS; // For debug spew.
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TraceMsg(TF_FTPREF, "DllRelease() g_cRef=%d, called from=%#08lx.", g_cRef-1, GET_CALLERS_ADDRESS);
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InterlockedDecrement((LPLONG)&g_cRef);
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}
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/*****************************************************************************
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*
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* DllGetClassObject
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*
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* OLE entry point. Produces an IClassFactory for the indicated GUID.
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*
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* The artificial refcount inside DllGetClassObject helps to
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* avoid the race condition described in DllCanUnloadNow. It's
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* not perfect, but it makes the race window much smaller.
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*
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*****************************************************************************/
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STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID * ppvObj)
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{
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HRESULT hres;
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DllAddRef();
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if (IsEqualIID(rclsid, CLSID_FtpFolder) ||
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IsEqualIID(rclsid, CLSID_FtpWebView) ||
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IsEqualIID(rclsid, CLSID_FtpDataObject) ||
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IsEqualIID(rclsid, CLSID_FtpInstaller))
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{
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hres = CFtpFactory_Create(rclsid, riid, ppvObj);
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}
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else
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{
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*ppvObj = NULL;
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hres = CLASS_E_CLASSNOTAVAILABLE;
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}
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DllRelease();
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return hres;
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}
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/*****************************************************************************
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*
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* DllCanUnloadNow
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*
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* OLE entry point. Fail iff there are outstanding refs.
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*
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* There is an unavoidable race condition between DllCanUnloadNow
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* and the creation of a new IClassFactory: Between the time we
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* return from DllCanUnloadNow() and the caller inspects the value,
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* another thread in the same process may decide to call
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* DllGetClassObject, thus suddenly creating an object in this DLL
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* when there previously was none.
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*
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* It is the caller's responsibility to prepare for this possibility;
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* there is nothing we can do about it.
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*
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*****************************************************************************/
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STDMETHODIMP DllCanUnloadNow(void)
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{
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HRESULT hres;
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ENTERCRITICALNOASSERT;
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// Purge Cache if there aren't any FtpViews open.
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if ((0 == g_cRef_CFtpView))
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{
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// Since no views are open, we want to try to purge
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// the Delayed Actions so we can closed down the background
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// thread. Is it running?
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if (AreOutstandingDelayedActions())
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{
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LEAVECRITICALNOASSERT;
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PurgeDelayedActions(); // Try to close it down.
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ENTERCRITICALNOASSERT;
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}
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if (!AreOutstandingDelayedActions()) // Did it close down?
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{
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// We need to purge the session key because we lost the password
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// redirects in the CFtpSites. So we would login but later fail
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// when we try to fish out the password when falling back to
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// URLMON/shdocfl for file downloads. (NT #362108)
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PurgeSessionKey();
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CFtpPunkList_Purge(&g_FtpSiteCache); // Yes so purge the cache...
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}
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}
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hres = g_cRef ? S_FALSE : S_OK;
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TraceMsg(TF_FTP_DLLLOADING, "DllCanUnloadNow() DllRefs=%d, returning hres=%#08lx. (S_OK means yes)", g_cRef, hres);
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LEAVECRITICALNOASSERT;
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return hres;
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}
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void CheckForLeaks(BOOL fForce)
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{
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#ifdef DEBUG
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DWORD dwLeakCount = 0;
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if (fForce)
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{
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// Let's free our stuff so we can make sure not to leak it.
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// This is done more to force our selves to be w/o leaks
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// than anything else.
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DllCanUnloadNow();
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}
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for (int nIndex = 0; nIndex < ARRAYSIZE(g_LeakList); nIndex++)
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dwLeakCount += g_LeakList[nIndex].dwRef;
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if ((!g_FtpSiteCache || fForce) && (dwLeakCount || g_dwOpenConnections || g_cRef))
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{
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TraceMsg(TF_ALWAYS, "***********************************************");
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TraceMsg(TF_ALWAYS, "* LEAK - LEAK - LEAK - LEAK - LEAK *");
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TraceMsg(TF_ALWAYS, "* *");
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TraceMsg(TF_ALWAYS, "* WARNING: The FTP Shell Extension Leaked *");
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TraceMsg(TF_ALWAYS, "* one or more objects *");
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TraceMsg(TF_ALWAYS, "***********************************************");
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TraceMsg(TF_ALWAYS, "* *");
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for (int nIndex = 0; nIndex < ARRAYSIZE(g_LeakList); nIndex++)
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{
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if (g_LeakList[nIndex].dwRef)
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TraceMsg(TF_ALWAYS, "* %hs, Leaked=%d *", g_LeakList[nIndex].szObject, g_LeakList[nIndex].dwRef);
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}
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TraceMsg(TF_ALWAYS, "* *");
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TraceMsg(TF_ALWAYS, "* Open Wininet Connections=%d *", g_dwOpenConnections);
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TraceMsg(TF_ALWAYS, "* DLL Refs=%d *", g_cRef);
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TraceMsg(TF_ALWAYS, "* *");
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TraceMsg(TF_ALWAYS, "***********************************************");
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ASSERT(0);
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}
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#endif // DEBUG
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}
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// Globals to free.
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extern CCookieList * g_pCookieList;
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/*****************************************************************************\
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DESCRIPTION:
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DLL entry point.
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\*****************************************************************************/
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STDAPI_(BOOL) DllEntry(HINSTANCE hinst, DWORD dwReason, LPVOID lpReserved)
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{
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// This is called in two situations, FreeLibrary() is called and lpReserved is
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// NULL, or the process is shutting down and lpReserved is not NULL.
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BOOL fIsProcessShuttingDown = (lpReserved ? TRUE : FALSE);
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switch (dwReason)
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{
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case DLL_PROCESS_ATTACH:
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SHFusionInitializeFromModule(hinst);
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InitializeCriticalSection(&g_csDll);
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#ifdef DEBUG
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g_TlsMem = TlsAlloc();
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g_TLSliStopWatchStartHi = TlsAlloc();
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g_TLSliStopWatchStartLo = TlsAlloc();
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#endif
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// Don't put it under #ifdef DEBUG
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CcshellGetDebugFlags();
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DisableThreadLibraryCalls(hinst);
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g_hthWorker = NULL;
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g_hinst = hinst;
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g_formatEtcOffsets.cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_SHELLIDLISTOFFSET);
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g_formatPasteSucceeded.cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_PASTESUCCEEDED);
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g_cfTargetCLSID = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_TARGETCLSID);
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g_dropTypes[DROP_FCont].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_FILECONTENTS);
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g_dropTypes[DROP_FGDW].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW);
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g_dropTypes[DROP_FGDA].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA);
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g_dropTypes[DROP_IDList].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_SHELLIDLIST);
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g_dropTypes[DROP_FNMA].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_FILENAMEMAPA);
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g_dropTypes[DROP_FNMW].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_FILENAMEMAPW);
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g_dropTypes[DROP_PrefDe].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT);
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g_dropTypes[DROP_PerfDe].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(CFSTR_PERFORMEDDROPEFFECT);
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g_dropTypes[DROP_FTP_PRIVATE].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(TEXT("FtpPrivateData"));
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g_dropTypes[DROP_URL].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(TEXT("UniformResourceLocator"));
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g_dropTypes[DROP_OLEPERSIST].cfFormat = (CLIPFORMAT)RegisterClipboardFormat(TEXT("OleClipboardPersistOnFlush"));
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GetModuleFileNameA(GetModuleHandle(TEXT("SHELL32")), g_szShell32, ARRAYSIZE(g_szShell32));
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if (FAILED(CFtpSite_Init()))
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return 0;
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break;
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case DLL_PROCESS_DETACH:
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{
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CCookieList * pCookieList = (CCookieList *) InterlockedExchangePointer((void **) &g_pCookieList, NULL);
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if (pCookieList)
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delete pCookieList;
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// Yes, so we need to make sure all of the CFtpView's have closed down
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// or it's really bad to purge the FTP cache of FTP Servers (CFtpSite) and
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// their directories (CFtpDir).
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ASSERT(0 == g_cRef_CFtpView);
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// Now force the Delayed Actions to happen now instead of waiting.
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PurgeDelayedActions();
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// OndrejS turned this on. It's firing but I think they are false positives. Since FTP
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// Folders does so much caching, this is non-trivial to track down. I will turn this off
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// until Ondrej has time to verify.
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// CheckForLeaks(fIsProcessShuttingDown);
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UnloadWininet();
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DeleteCriticalSection(&g_csDll);
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#ifdef DEBUG
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if (g_TLSliStopWatchStartHi)
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{
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TlsFree(g_TLSliStopWatchStartHi);
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g_TLSliStopWatchStartHi = NULL;
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}
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if (g_TLSliStopWatchStartLo)
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{
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TlsFree(g_TLSliStopWatchStartLo);
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g_TLSliStopWatchStartLo = NULL;
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}
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#endif
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SHFusionUninitialize();
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}
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break;
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}
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return 1;
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}
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