1 files changed, 359 insertions, 0 deletions

diff --git a/src/dnchost/dncutil.cpp b/src/dnchost/dncutil.cpp
new file mode 100644
index 00000000..996bf086
--- /dev/null
+++ b/src/dnchost/dncutil.cpp
@@ -0,0 +1,359 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+// https://github.com/dotnet/runtime/blob/master/src/installer/corehost/error_codes.h
+#define HostApiBufferTooSmall 0x80008098
+
+// internal function declarations
+
+static HRESULT GetHostfxrPath(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath
+    );
+static HRESULT LoadHostfxr(
+    __in HOSTFXR_STATE* pState
+    );
+static HRESULT InitializeHostfxr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzManagedHostPath,
+    __in LPCWSTR wzDepsJsonPath,
+    __in LPCWSTR wzRuntimeConfigPath
+    );
+static HRESULT InitializeCoreClr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath
+    );
+static HRESULT LoadCoreClr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzCoreClrPath
+    );
+static HRESULT StartCoreClr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath,
+    __in size_t cProperties,
+    __in LPCWSTR* propertyKeys,
+    __in LPCWSTR* propertyValues
+    );
+
+
+// function definitions
+
+HRESULT DnchostLoadRuntime(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath,
+    __in LPCWSTR wzManagedHostPath,
+    __in LPCWSTR wzDepsJsonPath,
+    __in LPCWSTR wzRuntimeConfigPath
+    )
+{
+    HRESULT hr = S_OK;
+
+    hr = GetHostfxrPath(pState, wzNativeHostPath);
+    BalExitOnFailure(hr, "Failed to find hostfxr.");
+
+    hr = LoadHostfxr(pState);
+    BalExitOnFailure(hr, "Failed to load hostfxr.");
+
+    hr = InitializeHostfxr(pState, wzManagedHostPath, wzDepsJsonPath, wzRuntimeConfigPath);
+    BalExitOnFailure(hr, "Failed to initialize hostfxr.");
+
+    hr = InitializeCoreClr(pState, wzNativeHostPath);
+    BalExitOnFailure(hr, "Failed to initialize coreclr.");
+
+LExit:
+    return hr;
+}
+
+HRESULT DnchostCreateFactory(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzBaFactoryAssemblyName,
+    __in LPCWSTR wzBaFactoryAssemblyPath,
+    __out IBootstrapperApplicationFactory** ppAppFactory
+    )
+{
+    HRESULT hr = S_OK;
+    PFNCREATEBAFACTORY pfnCreateBAFactory = NULL;
+
+    hr = pState->pfnCoreclrCreateDelegate(
+        pState->pClrHandle,
+        pState->dwDomainId,
+        DNC_ASSEMBLY_FULL_NAME,
+        DNC_ENTRY_TYPE,
+        DNC_STATIC_ENTRY_METHOD,
+        reinterpret_cast<void**>(&pfnCreateBAFactory));
+    BalExitOnFailure(hr, "Failed to create delegate in app domain.");
+
+    *ppAppFactory = pfnCreateBAFactory(wzBaFactoryAssemblyName, wzBaFactoryAssemblyPath);
+
+LExit:
+    return hr;
+}
+
+static HRESULT GetHostfxrPath(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath
+    )
+{
+    HRESULT hr = S_OK;
+    get_hostfxr_parameters getHostfxrParameters = { };
+    int nrc = 0;
+    size_t cchHostFxrPath = MAX_PATH;
+
+    getHostfxrParameters.size = sizeof(get_hostfxr_parameters);
+    getHostfxrParameters.assembly_path = wzNativeHostPath;
+
+    // get_hostfxr_path does a full search on every call, so
+    //    minimize the number of calls
+    //    need to loop
+    for (;;)
+    {
+        cchHostFxrPath *= 2;
+        hr = StrAlloc(&pState->sczHostfxrPath, cchHostFxrPath);
+        BalExitOnFailure(hr, "Failed to allocate hostFxrPath.");
+
+        nrc = get_hostfxr_path(pState->sczHostfxrPath, &cchHostFxrPath, &getHostfxrParameters);
+        if (HostApiBufferTooSmall != nrc)
+        {
+            break;
+        }
+    }
+    if (0 != nrc)
+    {
+        BalExitOnFailure(hr = nrc, "GetHostfxrPath failed");
+    }
+
+LExit:
+    return hr;
+}
+
+static HRESULT LoadHostfxr(
+    __in HOSTFXR_STATE* pState
+    )
+{
+    HRESULT hr = S_OK;
+    HMODULE hHostfxr;
+
+    hHostfxr = ::LoadLibraryExW(pState->sczHostfxrPath, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
+    BalExitOnNullWithLastError(hHostfxr, hr, "Failed to load hostfxr from '%ls'.", pState->sczHostfxrPath);
+
+    pState->pfnHostfxrInitializeForApp = reinterpret_cast<hostfxr_initialize_for_dotnet_command_line_fn>(::GetProcAddress(hHostfxr, "hostfxr_initialize_for_dotnet_command_line"));
+    BalExitOnNullWithLastError(pState->pfnHostfxrInitializeForApp, hr, "Failed to get procedure address for hostfxr_initialize_for_dotnet_command_line.");
+
+    pState->pfnHostfxrGetRuntimeProperties = reinterpret_cast<hostfxr_get_runtime_properties_fn>(::GetProcAddress(hHostfxr, "hostfxr_get_runtime_properties"));
+    BalExitOnNullWithLastError(pState->pfnHostfxrGetRuntimeProperties, hr, "Failed to get procedure address for hostfxr_get_runtime_properties.");
+
+    pState->pfnHostfxrSetErrorWriter = reinterpret_cast<hostfxr_set_error_writer_fn>(::GetProcAddress(hHostfxr, "hostfxr_set_error_writer"));
+    BalExitOnNullWithLastError(pState->pfnHostfxrSetErrorWriter, hr, "Failed to get procedure address for hostfxr_set_error_writer.");
+
+    pState->pfnHostfxrClose = reinterpret_cast<hostfxr_close_fn>(::GetProcAddress(hHostfxr, "hostfxr_close"));
+    BalExitOnNullWithLastError(pState->pfnHostfxrClose, hr, "Failed to get procedure address for hostfxr_close.");
+
+LExit:
+    // Never unload the module since it isn't meant to be unloaded.
+
+    return hr;
+}
+
+static void HOSTFXR_CALLTYPE DnchostErrorWriter(
+    __in LPCWSTR wzMessage
+    )
+{
+    BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "error from hostfxr: %ls", wzMessage);
+}
+
+static HRESULT InitializeHostfxr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzManagedHostPath,
+    __in LPCWSTR wzDepsJsonPath,
+    __in LPCWSTR wzRuntimeConfigPath
+    )
+{
+    HRESULT hr = S_OK;
+
+    pState->pfnHostfxrSetErrorWriter(static_cast<hostfxr_error_writer_fn>(&DnchostErrorWriter));
+
+    LPCWSTR argv[] = {
+        L"exec",
+        L"--depsfile",
+        wzDepsJsonPath,
+        L"--runtimeconfig",
+        wzRuntimeConfigPath,
+        wzManagedHostPath,
+    };
+    hr = pState->pfnHostfxrInitializeForApp(sizeof(argv)/sizeof(LPWSTR), argv, NULL, &pState->hostContextHandle);
+    BalExitOnFailure(hr, "HostfxrInitializeForApp failed");
+
+LExit:
+    return hr;
+}
+
+static HRESULT InitializeCoreClr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath
+    )
+{
+    HRESULT hr = S_OK;
+    int32_t rc = 0;
+    LPCWSTR* rgPropertyKeys = NULL;
+    LPCWSTR* rgPropertyValues = NULL;
+    size_t cProperties = 0;
+    LPWSTR* rgDirectories = NULL;
+    UINT cDirectories = 0;
+    LPWSTR sczCoreClrPath = NULL;
+
+    // We are not using hostfxr as it was intended to be used. We need to initialize hostfxr so that it properly initializes hostpolicy -
+    // there are pieces of the framework such as AssemblyDependencyResolver that won't work without that. We also need hostfxr to find a
+    // compatible framework for framework-dependent deployed BAs. We had to use hostfxr_initialize_for_dotnet_command_line since
+    // hostfxr_initialize_for_runtime_config doesn't currently (3.x) support self-contained deployed BAs. That means we're supposed to
+    // start the runtime through hostfxr_run_app, but that method shuts down the runtime before returning. We actually want to call
+    // hostfxr_get_runtime_delegate, but that method currently requires hostfxr to be initialized through
+    // hostfxr_initialize_for_runtime_config. So we're forced to locate coreclr.dll and manually load the runtime ourselves.
+
+    // Unfortunately, that's not the only problem. hostfxr has global state that tracks whether it started the runtime. While we keep our
+    // hostfxr_handle open, everyone that calls the hostfxr_initialize_* methods will block until we have started the runtime through
+    // hostfxr or closed our handle. If we close the handle, then hostfxr could potentially try to load a second runtime into the
+    // process, which is not supported. We're going to just keep our handle open since no one else in the process should be trying to
+    // start the runtime anyway.
+
+    rc = pState->pfnHostfxrGetRuntimeProperties(pState->hostContextHandle, &cProperties, rgPropertyKeys, rgPropertyValues);
+    if (HostApiBufferTooSmall != rc)
+    {
+        BalExitOnFailure(hr = rc, "HostfxrGetRuntimeProperties failed to return required size.");
+    }
+
+    rgPropertyKeys = static_cast<LPCWSTR*>(MemAlloc(sizeof(LPWSTR) * cProperties, TRUE));
+    rgPropertyValues = static_cast<LPCWSTR*>(MemAlloc(sizeof(LPWSTR) * cProperties, TRUE));
+    if (!rgPropertyKeys || !rgPropertyValues)
+    {
+        BalExitOnFailure(hr = E_OUTOFMEMORY, "Failed to allocate buffers for runtime properties.");
+    }
+
+    hr = pState->pfnHostfxrGetRuntimeProperties(pState->hostContextHandle, &cProperties, rgPropertyKeys, rgPropertyValues);
+    BalExitOnFailure(hr, "HostfxrGetRuntimeProperties failed.");
+
+    for (DWORD i = 0; i < cProperties; ++i)
+    {
+        if (CSTR_EQUAL == ::CompareString(LOCALE_INVARIANT, 0, rgPropertyKeys[i], -1, L"NATIVE_DLL_SEARCH_DIRECTORIES", -1))
+        {
+            hr = StrSplitAllocArray(&rgDirectories, &cDirectories, rgPropertyValues[i], L";");
+            BalExitOnFailure(hr, "Failed to split NATIVE_DLL_SEARCH_DIRECTORIES '%ls'", rgPropertyValues[i]);
+        }
+    }
+
+    for (DWORD i = 0; i < cDirectories; ++i)
+    {
+        hr = PathConcat(rgDirectories[i], L"coreclr.dll", &sczCoreClrPath);
+        BalExitOnFailure(hr, "Failed to allocate path to coreclr.");
+
+        if (::PathFileExists(sczCoreClrPath))
+        {
+            break;
+        }
+        else
+        {
+            ReleaseNullStr(sczCoreClrPath);
+        }
+    }
+
+    if (!sczCoreClrPath)
+    {
+        for (DWORD i = 0; i < cProperties; ++i)
+        {
+            BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "%ls: %ls", rgPropertyKeys[i], rgPropertyValues[i]);
+        }
+        BalExitOnFailure(hr = E_FILENOTFOUND, "Failed to locate coreclr.dll.");
+    }
+
+    hr = LoadCoreClr(pState, sczCoreClrPath);
+    BalExitOnFailure(hr, "Failed to load coreclr.");
+
+    hr = StartCoreClr(pState, wzNativeHostPath, cProperties, rgPropertyKeys, rgPropertyValues);
+    BalExitOnFailure(hr, "Failed to start coreclr.");
+
+LExit:
+    MemFree(rgDirectories);
+    MemFree(rgPropertyValues);
+    MemFree(rgPropertyKeys);
+    ReleaseStr(sczCoreClrPath);
+
+    return hr;
+}
+
+static HRESULT LoadCoreClr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzCoreClrPath
+    )
+{
+    HRESULT hr = S_OK;
+    HMODULE hModule = NULL;
+
+    hModule = ::LoadLibraryExW(wzCoreClrPath, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
+    BalExitOnNullWithLastError(hModule, hr, "Failed to load coreclr.dll from '%ls'.", wzCoreClrPath);
+
+    pState->pfnCoreclrInitialize = reinterpret_cast<coreclr_initialize_ptr>(::GetProcAddress(hModule, "coreclr_initialize"));
+    BalExitOnNullWithLastError(pState->pfnCoreclrInitialize, hr, "Failed to get procedure address for coreclr_initialize.");
+
+    pState->pfnCoreclrCreateDelegate = reinterpret_cast<coreclr_create_delegate_ptr>(::GetProcAddress(hModule, "coreclr_create_delegate"));
+    BalExitOnNullWithLastError(pState->pfnCoreclrCreateDelegate, hr, "Failed to get procedure address for coreclr_create_delegate.");
+
+LExit:
+    // Never unload the module since coreclr doesn't support it.
+
+    return hr;
+}
+
+static HRESULT StartCoreClr(
+    __in HOSTFXR_STATE* pState,
+    __in LPCWSTR wzNativeHostPath,
+    __in size_t cProperties,
+    __in LPCWSTR* propertyKeys,
+    __in LPCWSTR* propertyValues
+    )
+{
+    HRESULT hr = S_OK;
+    LPSTR szNativeHostPath = NULL;
+    LPSTR* rgPropertyKeys = NULL;
+    LPSTR* rgPropertyValues = NULL;
+    
+    rgPropertyKeys = static_cast<LPSTR*>(MemAlloc(sizeof(LPSTR) * cProperties, TRUE));
+    rgPropertyValues = static_cast<LPSTR*>(MemAlloc(sizeof(LPSTR) * cProperties, TRUE));
+    if (!rgPropertyKeys || !rgPropertyValues)
+    {
+        BalExitOnFailure(hr = E_OUTOFMEMORY, "Failed to allocate buffers for runtime properties.");
+    }
+
+    hr = StrAnsiAllocString(&szNativeHostPath, wzNativeHostPath, 0, CP_UTF8);
+    BalExitOnFailure(hr, "Failed to convert module path to UTF8: %ls", wzNativeHostPath);
+
+    for (DWORD i = 0; i < cProperties; ++i)
+    {
+        hr = StrAnsiAllocString(&rgPropertyKeys[i], propertyKeys[i], 0, CP_UTF8);
+        BalExitOnFailure(hr, "Failed to convert property key to UTF8: %ls", propertyKeys[i]);
+
+        hr = StrAnsiAllocString(&rgPropertyValues[i], propertyValues[i], 0, CP_UTF8);
+        BalExitOnFailure(hr, "Failed to convert property value to UTF8: %ls", propertyValues[i]);
+    }
+
+    hr = pState->pfnCoreclrInitialize(szNativeHostPath, "MBA", cProperties, (LPCSTR*)rgPropertyKeys, (LPCSTR*)rgPropertyValues, &pState->pClrHandle, &pState->dwDomainId);
+    BalExitOnFailure(hr, "CoreclrInitialize failed.");
+
+LExit:
+    for (DWORD i = 0; i < cProperties; ++i)
+    {
+        if (rgPropertyKeys)
+        {
+            ReleaseStr(rgPropertyKeys[i]);
+        }
+
+        if (rgPropertyValues)
+        {
+            ReleaseStr(rgPropertyValues[i]);
+        }
+    }
+    ReleaseMem(rgPropertyValues);
+    ReleaseMem(rgPropertyKeys);
+    ReleaseStr(szNativeHostPath);
+
+    return hr;
+}