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path: root/src/api/burn/balutil/balutil.cpp
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// 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"

const DWORD VARIABLE_GROW_FACTOR = 80;
static IBootstrapperEngine* vpEngine = NULL;

// prototypes

DAPI_(void) BalInitialize(
    __in IBootstrapperEngine* pEngine
    )
{
    pEngine->AddRef();

    ReleaseObject(vpEngine);
    vpEngine = pEngine;
}

DAPI_(HRESULT) BalInitializeFromCreateArgs(
    __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
    __out_opt IBootstrapperEngine** ppEngine
    )
{
    HRESULT hr = S_OK;
    IBootstrapperEngine* pEngine = NULL;

    hr = BalBootstrapperEngineCreate(pArgs->pfnBootstrapperEngineProc, pArgs->pvBootstrapperEngineProcContext, &pEngine);
    ExitOnFailure(hr, "Failed to create BalBootstrapperEngine.");

    BalInitialize(pEngine);

    if (ppEngine)
    {
        *ppEngine = pEngine;
    }
    pEngine = NULL;

LExit:
    ReleaseObject(pEngine);

    return hr;
}


DAPI_(void) BalUninitialize()
{
    ReleaseNullObject(vpEngine);
}


DAPI_(HRESULT) BalManifestLoad(
    __in HMODULE hBootstrapperApplicationModule,
    __out IXMLDOMDocument** ppixdManifest
    )
{
    HRESULT hr = S_OK;
    LPWSTR sczPath = NULL;

    hr = PathRelativeToModule(&sczPath, BAL_MANIFEST_FILENAME, hBootstrapperApplicationModule);
    ExitOnFailure(hr, "Failed to get path to bootstrapper application manifest: %ls", BAL_MANIFEST_FILENAME);

    hr = XmlLoadDocumentFromFile(sczPath, ppixdManifest);
    ExitOnFailure(hr, "Failed to load bootstrapper application manifest '%ls' from path: %ls", BAL_MANIFEST_FILENAME, sczPath);

LExit:
    ReleaseStr(sczPath);
    return hr;
}


DAPI_(HRESULT) BalEvaluateCondition(
    __in_z LPCWSTR wzCondition,
    __out BOOL* pf
    )
{
    HRESULT hr = S_OK;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = vpEngine->EvaluateCondition(wzCondition, pf);

LExit:
    return hr;
}


// The contents of psczOut may be sensitive, should keep encrypted and SecureZeroFree.
DAPI_(HRESULT) BalFormatString(
    __in_z LPCWSTR wzFormat,
    __inout LPWSTR* psczOut
    )
{
    HRESULT hr = S_OK;
    SIZE_T cch = 0;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    if (*psczOut)
    {
        hr = StrMaxLength(*psczOut, &cch);
        ExitOnFailure(hr, "Failed to determine length of value.");
    }

    hr = vpEngine->FormatString(wzFormat, *psczOut, &cch);
    if (E_MOREDATA == hr)
    {
        ++cch;

        hr = StrAllocSecure(psczOut, cch);
        ExitOnFailure(hr, "Failed to allocate value.");

        hr = vpEngine->FormatString(wzFormat, *psczOut, &cch);
    }

LExit:
    return hr;
}


// The contents of pllValue may be sensitive, if variable is hidden should keep value encrypted and SecureZeroMemory.
DAPI_(HRESULT) BalGetNumericVariable(
    __in_z LPCWSTR wzVariable,
    __out LONGLONG* pllValue
    )
{
    HRESULT hr = S_OK;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = vpEngine->GetVariableNumeric(wzVariable, pllValue);

LExit:
    return hr;
}


DAPI_(HRESULT) BalSetNumericVariable(
    __in_z LPCWSTR wzVariable,
    __in LONGLONG llValue
    )
{
    HRESULT hr = S_OK;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = vpEngine->SetVariableNumeric(wzVariable, llValue);

LExit:
    return hr;
}


DAPI_(BOOL) BalVariableExists(
    __in_z LPCWSTR wzVariable
    )
{
    HRESULT hr = S_OK;
    SIZE_T cch = 0;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = vpEngine->GetVariableString(wzVariable, NULL, &cch);

LExit:
    return E_NOTFOUND != hr;
}


// The contents of psczValue may be sensitive, if variable is hidden should keep value encrypted and SecureZeroFree.
DAPI_(HRESULT) BalGetStringVariable(
    __in_z LPCWSTR wzVariable,
    __inout LPWSTR* psczValue
    )
{
    HRESULT hr = S_OK;
    SIZE_T cch = 0;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    if (*psczValue)
    {
        hr = StrMaxLength(*psczValue, &cch);
        ExitOnFailure(hr, "Failed to determine length of value.");
    }

    hr = vpEngine->GetVariableString(wzVariable, *psczValue, &cch);
    if (E_MOREDATA == hr)
    {
        ++cch;

        hr = StrAllocSecure(psczValue, cch);
        ExitOnFailure(hr, "Failed to allocate value.");

        hr = vpEngine->GetVariableString(wzVariable, *psczValue, &cch);
    }

LExit:
    return hr;
}

DAPI_(HRESULT) BalSetStringVariable(
    __in_z LPCWSTR wzVariable,
    __in_z_opt LPCWSTR wzValue,
    __in BOOL fFormatted
    )
{
    HRESULT hr = S_OK;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = vpEngine->SetVariableString(wzVariable, wzValue, fFormatted);

LExit:
    return hr;
}


DAPIV_(HRESULT) BalLog(
    __in BOOTSTRAPPER_LOG_LEVEL level,
    __in_z __format_string LPCSTR szFormat,
    ...
    )
{
    HRESULT hr = S_OK;
    va_list args;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    va_start(args, szFormat);
    hr = BalLogArgs(level, szFormat, args);
    va_end(args);

LExit:
    return hr;
}


DAPI_(HRESULT) BalLogArgs(
    __in BOOTSTRAPPER_LOG_LEVEL level,
    __in_z __format_string LPCSTR szFormat,
    __in va_list args
    )
{
    HRESULT hr = S_OK;
    LPSTR sczFormattedAnsi = NULL;
    LPWSTR sczMessage = NULL;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = StrAnsiAllocFormattedArgs(&sczFormattedAnsi, szFormat, args);
    ExitOnFailure(hr, "Failed to format log string.");

    hr = StrAllocStringAnsi(&sczMessage, sczFormattedAnsi, 0, CP_UTF8);
    ExitOnFailure(hr, "Failed to convert log string to Unicode.");

    hr = vpEngine->Log(level, sczMessage);

LExit:
    ReleaseStr(sczMessage);
    ReleaseStr(sczFormattedAnsi);
    return hr;
}


DAPIV_(HRESULT) BalLogError(
    __in HRESULT hrError,
    __in_z __format_string LPCSTR szFormat,
    ...
    )
{
    HRESULT hr = S_OK;
    va_list args;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    va_start(args, szFormat);
    hr = BalLogErrorArgs(hrError, szFormat, args);
    va_end(args);

LExit:
    return hr;
}


DAPI_(HRESULT) BalLogErrorArgs(
    __in HRESULT hrError,
    __in_z __format_string LPCSTR szFormat,
    __in va_list args
    )
{
    HRESULT hr = S_OK;
    LPSTR sczFormattedAnsi = NULL;
    LPWSTR sczMessage = NULL;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    hr = StrAnsiAllocFormattedArgs(&sczFormattedAnsi, szFormat, args);
    ExitOnFailure(hr, "Failed to format error log string.");

    hr = StrAllocFormatted(&sczMessage, L"Error 0x%08x: %S", hrError, sczFormattedAnsi);
    ExitOnFailure(hr, "Failed to prepend error number to error log string.");

    hr = vpEngine->Log(BOOTSTRAPPER_LOG_LEVEL_ERROR, sczMessage);

LExit:
    ReleaseStr(sczMessage);
    ReleaseStr(sczFormattedAnsi);
    return hr;
}

DAPIV_(HRESULT) BalLogId(
    __in BOOTSTRAPPER_LOG_LEVEL level,
    __in DWORD dwLogId,
    __in HMODULE hModule,
    ...
    )
{
    HRESULT hr = S_OK;
    va_list args;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    va_start(args, hModule);
    hr = BalLogIdArgs(level, dwLogId, hModule, args);
    va_end(args);

LExit:
    return hr;
}

DAPI_(HRESULT) BalLogIdArgs(
    __in BOOTSTRAPPER_LOG_LEVEL level,
    __in DWORD dwLogId,
    __in HMODULE hModule,
    __in va_list args
    )
{

    HRESULT hr = S_OK;
    LPWSTR pwz = NULL;
    DWORD cch = 0;

    if (!vpEngine)
    {
        hr = E_POINTER;
        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
    }

    // Get the string for the id.
#pragma prefast(push)
#pragma prefast(disable:25028)
#pragma prefast(disable:25068)
    cch = ::FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_HMODULE,
        static_cast<LPCVOID>(hModule), dwLogId, 0, reinterpret_cast<LPWSTR>(&pwz), 0, &args);
#pragma prefast(pop)

    if (0 == cch)
    {
        ExitOnLastError(hr, "Failed to log id: %d", dwLogId);
    }

    if (2 <= cch && L'\r' == pwz[cch - 2] && L'\n' == pwz[cch - 1])
    {
        pwz[cch - 2] = L'\0'; // remove newline from message table.
    }

    hr = vpEngine->Log(level, pwz);

LExit:
    if (pwz)
    {
        ::LocalFree(pwz);
    }

    return hr;
}