summaryrefslogtreecommitdiff
path: root/src/mscorlib/corefx/Interop/Windows/kernel32/Interop.SafeCreateFile.cs
diff options
context:
space:
mode:
Diffstat (limited to 'src/mscorlib/corefx/Interop/Windows/kernel32/Interop.SafeCreateFile.cs')
-rw-r--r--src/mscorlib/corefx/Interop/Windows/kernel32/Interop.SafeCreateFile.cs45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/mscorlib/corefx/Interop/Windows/kernel32/Interop.SafeCreateFile.cs b/src/mscorlib/corefx/Interop/Windows/kernel32/Interop.SafeCreateFile.cs
new file mode 100644
index 0000000..4192f56
--- /dev/null
+++ b/src/mscorlib/corefx/Interop/Windows/kernel32/Interop.SafeCreateFile.cs
@@ -0,0 +1,45 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using Microsoft.Win32.SafeHandles;
+
+internal partial class Interop
+{
+ internal partial class Kernel32
+ {
+ internal static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1); // WinBase.h
+
+ /// <summary>
+ /// Does not allow access to non-file devices. This disallows DOS devices like "con:", "com1:",
+ /// "lpt1:", etc. Use this to avoid security problems, like allowing a web client asking a server
+ /// for "http://server/com1.aspx" and then causing a worker process to hang.
+ /// </summary>
+ internal static SafeFileHandle SafeCreateFile(
+ String lpFileName,
+ int dwDesiredAccess,
+ System.IO.FileShare dwShareMode,
+ ref Interop.Kernel32.SECURITY_ATTRIBUTES securityAttrs,
+ FileMode dwCreationDisposition,
+ int dwFlagsAndAttributes,
+ IntPtr hTemplateFile)
+ {
+ SafeFileHandle handle = UnsafeCreateFile(lpFileName, dwDesiredAccess, dwShareMode, ref securityAttrs, dwCreationDisposition, dwFlagsAndAttributes, hTemplateFile);
+
+ if (!handle.IsInvalid)
+ {
+ int fileType = Interop.Kernel32.GetFileType(handle);
+ if (fileType != Interop.Kernel32.FileTypes.FILE_TYPE_DISK)
+ {
+ handle.Dispose();
+ throw new NotSupportedException(SR.NotSupported_FileStreamOnNonFiles);
+ }
+ }
+
+ return handle;
+ }
+ }
+}