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//----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
namespace System.ServiceModel.Activation
{
using System;
using System.Collections.Generic;
using System.Runtime;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Security;
using System.Security.Principal;
using System.Security.Permissions;
using System.ServiceModel.Channels;
using System.Threading;
using System.ServiceModel;
using System.ComponentModel;
unsafe class SharedMemory : IDisposable
{
SafeFileMappingHandle fileMapping;
SharedMemory(SafeFileMappingHandle fileMapping)
{
this.fileMapping = fileMapping;
}
[PermissionSet(SecurityAction.Demand, Unrestricted = true), SecuritySafeCritical]
public static unsafe SharedMemory Create(string name, Guid content, List<SecurityIdentifier> allowedSids)
{
int errorCode = UnsafeNativeMethods.ERROR_SUCCESS;
byte[] binarySecurityDescriptor = SecurityDescriptorHelper.FromSecurityIdentifiers(allowedSids, UnsafeNativeMethods.GENERIC_READ);
SafeFileMappingHandle fileMapping;
UnsafeNativeMethods.SECURITY_ATTRIBUTES securityAttributes = new UnsafeNativeMethods.SECURITY_ATTRIBUTES();
fixed (byte* pinnedSecurityDescriptor = binarySecurityDescriptor)
{
securityAttributes.lpSecurityDescriptor = (IntPtr)pinnedSecurityDescriptor;
fileMapping = UnsafeNativeMethods.CreateFileMapping((IntPtr)(-1), securityAttributes, UnsafeNativeMethods.PAGE_READWRITE, 0, sizeof(SharedMemoryContents), name);
errorCode = Marshal.GetLastWin32Error();
}
if (fileMapping.IsInvalid)
{
fileMapping.SetHandleAsInvalid();
fileMapping.Close();
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(errorCode));
}
SharedMemory sharedMemory = new SharedMemory(fileMapping);
SafeViewOfFileHandle view;
// Ignore return value.
GetView(fileMapping, true, out view);
try
{
SharedMemoryContents* contents = (SharedMemoryContents*)view.DangerousGetHandle();
contents->pipeGuid = content;
Thread.MemoryBarrier();
contents->isInitialized = true;
return sharedMemory;
}
finally
{
view.Close();
}
}
public void Dispose()
{
if (fileMapping != null)
{
fileMapping.Close();
fileMapping = null;
}
}
static bool GetView(SafeFileMappingHandle fileMapping, bool writable, out SafeViewOfFileHandle handle)
{
handle = UnsafeNativeMethods.MapViewOfFile(fileMapping, writable ? UnsafeNativeMethods.FILE_MAP_WRITE : UnsafeNativeMethods.FILE_MAP_READ, 0, 0, (IntPtr)sizeof(SharedMemoryContents));
int errorCode = Marshal.GetLastWin32Error();
if (!handle.IsInvalid)
{
return true;
}
else
{
handle.SetHandleAsInvalid();
fileMapping.Close();
// Only return false when it's reading time.
if (!writable && errorCode == UnsafeNativeMethods.ERROR_FILE_NOT_FOUND)
{
return false;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(errorCode));
}
}
[PermissionSet(SecurityAction.Demand, Unrestricted = true), SecuritySafeCritical]
public static string Read(string name)
{
string content;
if (Read(name, out content))
{
return content;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(UnsafeNativeMethods.ERROR_FILE_NOT_FOUND));
}
[PermissionSet(SecurityAction.Demand, Unrestricted = true), SecuritySafeCritical]
[ResourceConsumption(ResourceScope.Machine)]
public static bool Read(string name, out string content)
{
content = null;
SafeFileMappingHandle fileMapping = UnsafeNativeMethods.OpenFileMapping(UnsafeNativeMethods.FILE_MAP_READ, false, ListenerConstants.GlobalPrefix + name);
int errorCode = Marshal.GetLastWin32Error();
if (fileMapping.IsInvalid)
{
fileMapping.SetHandleAsInvalid();
fileMapping.Close();
if (errorCode == UnsafeNativeMethods.ERROR_FILE_NOT_FOUND)
{
return false;
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(errorCode));
}
try
{
SafeViewOfFileHandle view;
if (!GetView(fileMapping, false, out view))
{
return false;
}
try
{
SharedMemoryContents* contents = (SharedMemoryContents*)view.DangerousGetHandle();
content = contents->isInitialized ? contents->pipeGuid.ToString() : null;
return true;
}
finally
{
view.Close();
}
}
finally
{
fileMapping.Close();
}
}
[StructLayout(LayoutKind.Sequential)]
struct SharedMemoryContents
{
public bool isInitialized;
public Guid pipeGuid;
}
}
}
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