119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/*
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* Process Hacker Plugins -
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* Hardware Devices Plugin
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*
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* Copyright (C) 2016 dmex
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*
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* This file is part of Process Hacker.
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*
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* Process Hacker is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Process Hacker is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Process Hacker. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "devices.h"
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#include <Dbt.h>
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static BOOLEAN SubclassActive = FALSE;
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LRESULT CALLBACK MainWndDevicesSubclassProc(
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_In_ HWND hWnd,
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_In_ UINT uMsg,
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_In_ WPARAM wParam,
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_In_ LPARAM lParam,
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_In_ UINT_PTR uIdSubclass,
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_In_ ULONG_PTR dwRefData
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)
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{
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// Subclassing the main window just to process drive letter notifications
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// is bad and I don't know of any other way to achieve this.
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// The IOCTL_MOUNTMGR_CHANGE_NOTIFY callback would have been preferred but
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// doesn't work from non-elevated processes.
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switch (uMsg)
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{
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case WM_DEVICECHANGE:
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{
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switch (wParam)
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{
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case DBT_DEVICEARRIVAL: // Drive letter added
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case DBT_DEVICEREMOVECOMPLETE: // Drive letter removed
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{
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DEV_BROADCAST_HDR* deviceBroadcast = (DEV_BROADCAST_HDR*)lParam;
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if (deviceBroadcast->dbch_devicetype == DBT_DEVTYP_VOLUME)
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{
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PDEV_BROADCAST_VOLUME deviceVolume = (PDEV_BROADCAST_VOLUME)deviceBroadcast;
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PhAcquireQueuedLockShared(&DiskDrivesListLock);
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for (ULONG i = 0; i < DiskDrivesList->Count; i++)
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{
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PDV_DISK_ENTRY entry;
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entry = PhReferenceObjectSafe(DiskDrivesList->Items[i]);
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if (!entry)
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continue;
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// Reset the DiskIndex so we can re-query the index on the next interval update.
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entry->DiskIndex = ULONG_MAX;
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// Reset the DiskIndexName so we can re-query the name on the next interval update.
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PhClearReference(&entry->DiskIndexName);
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PhDereferenceObjectDeferDelete(entry);
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}
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PhReleaseQueuedLockShared(&DiskDrivesListLock);
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}
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}
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}
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goto DefaultWndProc;
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}
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break;
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}
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return DefSubclassProc(hWnd, uMsg, wParam, lParam);
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DefaultWndProc:
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return DefWindowProc(hWnd, uMsg, wParam, lParam);
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}
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VOID AddRemoveDeviceChangeCallback(
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VOID
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)
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{
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// We get called during the plugin LoadCallback, don't do anything.
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if (!PhMainWndHandle)
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return;
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// Add the subclass only when disks are being monitored, remove when no longer needed.
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if (DiskDrivesList->Count != 0)
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{
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if (!SubclassActive)
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{
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// We have a disk device, subclass the main window to detect drive letter changes.
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SetWindowSubclass(PhMainWndHandle, MainWndDevicesSubclassProc, 0, 0);
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SubclassActive = TRUE;
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}
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}
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else
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{
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if (SubclassActive)
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{
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// The user has removed the last disk device, remove the subclass.
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RemoveWindowSubclass(PhMainWndHandle, MainWndDevicesSubclassProc, 0);
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SubclassActive = FALSE;
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}
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}
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} |