Catch all exceptions on ANCM/IIS border (#864)

src/AspNetCoreModuleV2/AspNetCore/src/dllmain.cpp

@@ -70,7 +70,7 @@ RegisterModule(
 DWORD                           dwServerVersion,
 IHttpModuleRegistrationInfo *   pModuleInfo,
 IHttpServer *                   pHttpServer
-)
+) try
 /*++
 
 Routine description:
@@ -222,4 +222,4 @@ Finished:
 
     return hr;
 }
-
+CATCH_RETURN()

src/AspNetCoreModuleV2/AspNetCore/src/proxymodule.cxx

@@ -6,8 +6,7 @@
 #include "applicationmanager.h"
 #include "applicationinfo.h"
 #include "acache.h"
-#include "hostfxroptions.h"
+#include "exceptions.h"
-
 
 __override
 HRESULT
@@ -16,13 +15,12 @@ ASPNET_CORE_PROXY_MODULE_FACTORY::GetHttpModule(
     IModuleAllocator *  pAllocator
 )
 {
-    ASPNET_CORE_PROXY_MODULE *pModule = new (pAllocator) ASPNET_CORE_PROXY_MODULE();
+    try
-    if (pModule == NULL)
     {
-        return E_OUTOFMEMORY;
+        *ppModule = THROW_IF_NULL_ALLOC(new (pAllocator) ASPNET_CORE_PROXY_MODULE());;
-    }
-    *ppModule = pModule;
         return S_OK;
+    }
+    CATCH_RETURN();
 }
 
 __override
@@ -82,6 +80,8 @@ ASPNET_CORE_PROXY_MODULE::OnExecuteRequestHandler(
     REQUEST_NOTIFICATION_STATUS retVal = RQ_NOTIFICATION_CONTINUE;
     IAPPLICATION* pApplication = NULL;
     STRU struExeLocation;
+    try
+    {
 
         if (g_fInShutdown)
         {
@@ -169,6 +169,12 @@ ASPNET_CORE_PROXY_MODULE::OnExecuteRequestHandler(
 
         retVal = m_pHandler->OnExecuteRequestHandler();
 
+    }
+    catch (...)
+    {
+        hr = CaughtExceptionHResult();
+    }
+
 Finished:
     if (FAILED(hr))
     {
@@ -200,7 +206,16 @@ ASPNET_CORE_PROXY_MODULE::OnAsyncCompletion(
     IHttpCompletionInfo *   pCompletionInfo
 )
 {
+    try
+    {
         return m_pHandler->OnAsyncCompletion(
             pCompletionInfo->GetCompletionBytes(),
             pCompletionInfo->GetCompletionStatus());
+    }
+    catch (...)
+    {
+        // Log exception
+        CaughtExceptionHResult();
+        return RQ_NOTIFICATION_FINISH_REQUEST;
+    }
 }

src/AspNetCoreModuleV2/CommonLib/CommonLib.vcxproj

@@ -190,6 +190,7 @@
   <ItemGroup>
     <ClInclude Include="application.h" />
     <ClInclude Include="config_utility.h" />
+    <ClInclude Include="exceptions.h" />
     <ClInclude Include="GlobalVersionUtility.h" />
     <ClInclude Include="fx_ver.h" />
     <ClInclude Include="hostfxroptions.h" />

src/AspNetCoreModuleV2/CommonLib/debugutil.cpp

@@ -1,6 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
+#include "stdafx.h"
+
 #include "debugutil.h"
 #include "dbgutil.h"
 

src/AspNetCoreModuleV2/CommonLib/debugutil.h

@@ -2,7 +2,8 @@
 // Licensed under the MIT License. See License.txt in the project root for license information.
 
 #pragma once
-#include "stdafx.h"
+
+#include <Windows.h>
 
 #define ASPNETCORE_DEBUG_FLAG_INFO          DEBUG_FLAG_INFO
 #define ASPNETCORE_DEBUG_FLAG_WARNING       DEBUG_FLAG_WARN

src/AspNetCoreModuleV2/CommonLib/exceptions.h

@@ -0,0 +1,59 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for license information.
+
+#pragma once
+
+#include <system_error>
+
+#include "debugutil.h"
+
+inline VOID ReportUntypedException()
+{
+    DebugPrint(ASPNETCORE_DEBUG_FLAG_ERROR, "Unhandled non-standard exception");
+}
+
+inline VOID ReportException(std::exception& exception)
+{
+    DebugPrintf(ASPNETCORE_DEBUG_FLAG_ERROR, "Unhandled exception: %s", exception.what());
+}
+
+inline __declspec(noinline) HRESULT CaughtExceptionHResult()
+{
+    try
+    {
+        throw;
+    }
+    catch (const std::bad_alloc&)
+    {
+        return E_OUTOFMEMORY;
+    }
+    catch (std::system_error& exception)
+    {
+        ReportException(exception);
+        return exception.code().value();
+    }
+    catch (std::exception& exception)
+    {
+        ReportException(exception);
+        return HRESULT_FROM_WIN32(ERROR_UNHANDLED_EXCEPTION);
+    }
+    catch (...)
+    {
+        ReportUntypedException();
+        return HRESULT_FROM_WIN32(ERROR_UNHANDLED_EXCEPTION);
+    }
+}
+
+template <typename PointerT> auto Throw_IfNullAlloc(PointerT pointer)
+{
+    if (pointer == nullptr)
+    {
+        throw std::bad_alloc();
+    }
+    return pointer;
+}
+
+
+#define RETURN_CAUGHT_EXCEPTION()                               return CaughtExceptionHResult();
+#define CATCH_RETURN()                                          catch (...) { RETURN_CAUGHT_EXCEPTION(); }
+#define THROW_IF_NULL_ALLOC(ptr)                                Throw_IfNullAlloc(ptr)

src/AspNetCoreModuleV2/CommonLib/stdafx.h

@@ -40,4 +40,4 @@
 #include "hostfxr_utility.h"
 #include "EventLog.h"
 #include "hostfxroptions.h"
-
+#include "exceptions.h"

test/CommonLibTests/exception_handler_tests.cpp

@@ -0,0 +1,49 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+#include "stdafx.h"
+
+TEST(CaughtExceptionHResult, ReturnsOutOfMemoryForBadAlloc)
+{
+    HRESULT hr;
+    try
+    {
+        throw std::bad_alloc();
+    }
+    catch(...)
+    {
+        hr = CaughtExceptionHResult();
+    }
+
+    EXPECT_EQ(E_OUTOFMEMORY, hr);
+}
+
+TEST(CaughtExceptionHResult, ReturnsValueForSystemError)
+{
+    HRESULT hr;
+    try
+    {
+        throw std::system_error(E_INVALIDARG, std::system_category());
+    }
+    catch(...)
+    {
+        hr = CaughtExceptionHResult();
+    }
+
+    EXPECT_EQ(E_INVALIDARG, hr);
+}
+
+TEST(CaughtExceptionHResult, ReturnsUhandledExceptionForOtherExceptions)
+{
+    HRESULT hr;
+    try
+    {
+        throw E_INVALIDARG;
+    }
+    catch(...)
+    {
+        hr = CaughtExceptionHResult();
+    }
+
+    EXPECT_EQ(HRESULT_FROM_WIN32(ERROR_UNHANDLED_EXCEPTION), hr);
+}