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158 lines
5.1 KiB
C
158 lines
5.1 KiB
C
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/*
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* Rufus: The Resourceful USB Formatting Utility
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* Drive access function calls
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* Copyright (c) 2011 Pete Batard <pete@akeo.ie>
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef _CRTDBG_MAP_ALLOC
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#include <stdlib.h>
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#include <crtdbg.h>
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#endif
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#include <windows.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "msapi_utf8.h"
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#include "rufus.h"
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#include "resource.h"
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/*
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* Globals
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*/
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RUFUS_DRIVE_INFO SelectedDrive;
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/*
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* Open a drive or volume with optional write and lock access
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* Returns INVALID_HANDLE_VALUE (/!\ which is DIFFERENT from NULL /!\) on failure.
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* This call is quite risky (left unchecked, inadvertently passing 0 as index would
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* return a handle to C:, which we might then proceed to unknowingly repartition!),
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* so we apply the following mitigation factors:
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* - Valid indexes must belong to a specific range [DRIVE_INDEX_MIN; DRIVE_INDEX_MAX]
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* - When opening for write access, we lock the volume. If that fails, which would
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* typically be the case on C:\ or any other drive in use, we report failure
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* - We report the full path of any drive that was successfully opened for write acces
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*/
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HANDLE GetDriveHandle(DWORD DriveIndex, char* DriveLetter, BOOL bWriteAccess, BOOL bLockDrive)
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{
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BOOL r;
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DWORD size;
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HANDLE hDrive = INVALID_HANDLE_VALUE;
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STORAGE_DEVICE_NUMBER_REDEF device_number = {0};
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char drives[26*4]; /* "D:\", "E:\", etc. */
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char *drive = drives;
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char logical_drive[] = "\\\\.\\#:";
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char physical_drive[24];
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if ((DriveIndex < DRIVE_INDEX_MIN) || (DriveIndex > DRIVE_INDEX_MAX)) {
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uprintf("WARNING: Bad index value. Please check the code!\n");
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}
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DriveIndex -= DRIVE_INDEX_MIN;
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// If no drive letter is requested, open a phyical drive
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if (DriveLetter == NULL) {
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safe_sprintf(physical_drive, sizeof(physical_drive), "\\\\.\\PHYSICALDRIVE%d", DriveIndex);
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hDrive = CreateFileA(physical_drive, GENERIC_READ|(bWriteAccess?GENERIC_WRITE:0),
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FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0);
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if (hDrive == INVALID_HANDLE_VALUE) {
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uprintf("Could not open drive %s: %s\n", physical_drive, WindowsErrorString());
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goto out;
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}
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if (bWriteAccess) {
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uprintf("Caution: Opened %s drive for write access\n", physical_drive);
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}
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} else {
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*DriveLetter = ' ';
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size = GetLogicalDriveStringsA(sizeof(drives), drives);
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if (size == 0) {
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uprintf("GetLogicalDriveStrings failed: %s\n", WindowsErrorString());
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goto out;
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}
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if (size > sizeof(drives)) {
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uprintf("GetLogicalDriveStrings: buffer too small (required %d vs %d)\n", size, sizeof(drives));
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goto out;
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}
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hDrive = INVALID_HANDLE_VALUE;
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for ( ;*drive; drive += safe_strlen(drive)+1) {
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if (!isalpha(*drive))
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continue;
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*drive = (char)toupper((int)*drive);
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if (*drive < 'C') {
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continue;
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}
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safe_sprintf(logical_drive, sizeof(logical_drive), "\\\\.\\%c:", drive[0]);
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hDrive = CreateFileA(logical_drive, GENERIC_READ|(bWriteAccess?GENERIC_WRITE:0),
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FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, 0);
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if (hDrive == INVALID_HANDLE_VALUE) {
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uprintf("Warning: could not open drive %c: %s\n", drive[0], WindowsErrorString());
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continue;
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}
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r = DeviceIoControl(hDrive, IOCTL_STORAGE_GET_DEVICE_NUMBER, NULL,
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0, &device_number, sizeof(device_number), &size, NULL);
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if ((!r) || (size <= 0)) {
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uprintf("IOCTL_STORAGE_GET_DEVICE_NUMBER failed for device %s: %s\n",
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logical_drive, WindowsErrorString());
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} else if (device_number.DeviceNumber == DriveIndex) {
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break;
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}
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safe_closehandle(hDrive);
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}
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if (hDrive == INVALID_HANDLE_VALUE) {
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goto out;
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}
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if (bWriteAccess) {
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uprintf("Caution: Opened %s drive for write access\n", logical_drive);
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}
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*DriveLetter = *drive?*drive:' ';
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}
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if ((bLockDrive) && (!DeviceIoControl(hDrive, FSCTL_LOCK_VOLUME, NULL, 0, NULL, 0, &size, NULL))) {
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uprintf("Could not get exclusive access to %s: %s\n", logical_drive, WindowsErrorString());
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safe_closehandle(hDrive);
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goto out;
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}
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out:
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return hDrive;
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}
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/*
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* Return the drive letter and volume label
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*/
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BOOL GetDriveLabel(DWORD DriveIndex, char* letter, char** label)
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{
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HANDLE hDrive;
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char DrivePath[] = "#:\\";
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static char volume_label[MAX_PATH+1];
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*label = STR_NO_LABEL;
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hDrive = GetDriveHandle(DriveIndex, DrivePath, FALSE, FALSE);
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if (hDrive == INVALID_HANDLE_VALUE)
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return FALSE;
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safe_closehandle(hDrive);
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*letter = DrivePath[0];
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if (GetVolumeInformationA(DrivePath, volume_label, sizeof(volume_label),
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NULL, NULL, NULL, NULL, 0) && *volume_label) {
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*label = volume_label;
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}
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return TRUE;
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}
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