/*

 * Copyright 1998-2025 The OpenSSL Project Authors. All Rights Reserved.

 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "internal/e_os.h"

#include "crypto/cryptlib.h"

#include <openssl/safestack.h>

#if defined(_WIN32) && !defined(OPENSSL_SYS_UEFI)

#include <tchar.h>

#include <signal.h>

#ifdef _MSC_VER

#define alloca _alloca

#endif

#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0333

#ifdef OPENSSL_SYS_WIN_CORE

int OPENSSL_isservice(void)

{

    /* OneCore API cannot interact with GUI */

    return 1;

}

#else

int OPENSSL_isservice(void)

{

    HWINSTA h;

    DWORD len;

    WCHAR *name;

    static union {

        void *p;

        FARPROC f;

    } _OPENSSL_isservice = {

        NULL

    };

    if (_OPENSSL_isservice.p == NULL) {

        HANDLE mod = GetModuleHandle(NULL);

        FARPROC f = NULL;

        if (mod != NULL)

            f = GetProcAddress(mod, "_OPENSSL_isservice");

        if (f == NULL)

            _OPENSSL_isservice.p = (void *)-1;

        else

            _OPENSSL_isservice.f = f;

    }

    if (_OPENSSL_isservice.p != (void *)-1)

        return (int)((*_OPENSSL_isservice.f)());

    h = GetProcessWindowStation();

    if (h == NULL)

        return -1;

    if (GetUserObjectInformationW(h, UOI_NAME, NULL, 0, &len) || GetLastError() != ERROR_INSUFFICIENT_BUFFER)

        return -1;

    if (len > 512)

        return -1; /* paranoia */

    len++, len &= ~1; /* paranoia */

    name = (WCHAR *)alloca(len + sizeof(WCHAR));

    if (!GetUserObjectInformationW(h, UOI_NAME, name, len, &len))

        return -1;

    len++, len &= ~1; /* paranoia */

    name[len / sizeof(WCHAR)] = L'\0'; /* paranoia */

#if 1

    /*

     * This doesn't cover "interactive" services [working with real

     * WinSta0's] nor programs started non-interactively by Task Scheduler

     * [those are working with SAWinSta].

     */

    if (wcsstr(name, L"Service-0x"))

        return 1;

#else

    /* This covers all non-interactive programs such as services. */

    if (!wcsstr(name, L"WinSta0"))

        return 1;

#endif

    else

        return 0;

}

#endif

#else

int OPENSSL_isservice(void)

{

    return 0;

}

#endif

void OPENSSL_showfatal(const char *fmta, ...)

{

    va_list ap;

    TCHAR buf[256];

    const TCHAR *fmt;

    /*

     * First check if it's a console application, in which case the

     * error message would be printed to standard error.

     */

#ifdef STD_ERROR_HANDLE

    HANDLE h;

    if ((h = GetStdHandle(STD_ERROR_HANDLE)) != NULL && GetFileType(h) != FILE_TYPE_UNKNOWN) {

        /* must be console application */

        int len;

        DWORD out;

        va_start(ap, fmta);

        len = _vsnprintf((char *)buf, sizeof(buf), fmta, ap);

        WriteFile(h, buf, len < 0 ? sizeof(buf) : (DWORD)len, &out, NULL);

        va_end(ap);

        return;

    }

#endif

    if (sizeof(TCHAR) == sizeof(char))

        fmt = (const TCHAR *)fmta;

    else

        do {

            int keepgoing;

            size_t len_0 = strlen(fmta) + 1, i;

            WCHAR *fmtw;

            fmtw = (WCHAR *)alloca(len_0 * sizeof(WCHAR));

            if (fmtw == NULL) {

                fmt = (const TCHAR *)L"no stack?";

                break;

            }

            if (!MultiByteToWideChar(CP_ACP, 0, fmta, (int)len_0, fmtw, (int)len_0))

                for (i = 0; i < len_0; i++)

                    fmtw[i] = (WCHAR)fmta[i];

            for (i = 0; i < len_0; i++) {

                if (fmtw[i] == L'%')

                    do {

                        keepgoing = 0;

                        switch (fmtw[i + 1]) {

                        case L'0':

                        case L'1':

                        case L'2':

                        case L'3':

                        case L'4':

                        case L'5':

                        case L'6':

                        case L'7':

                        case L'8':

                        case L'9':

                        case L'.':

                        case L'*':

                        case L'-':

                            i++;

                            keepgoing = 1;

                            break;

                        case L's':

                            fmtw[i + 1] = L'S';

                            break;

                        case L'S':

                            fmtw[i + 1] = L's';

                            break;

                        case L'c':

                            fmtw[i + 1] = L'C';

                            break;

                        case L'C':

                            fmtw[i + 1] = L'c';

                            break;

                        }

                    } while (keepgoing);

            }

            fmt = (const TCHAR *)fmtw;

        } while (0);

    va_start(ap, fmta);

    _vsntprintf(buf, OSSL_NELEM(buf) - 1, fmt, ap);

    buf[OSSL_NELEM(buf) - 1] = _T('\0');

    va_end(ap);

#if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0333

#ifdef OPENSSL_SYS_WIN_CORE

    /* ONECORE is always NONGUI and NT >= 0x0601 */

#if !defined(NDEBUG)

    /*

     * We are in a situation where we tried to report a critical

     * error and this failed for some reason. As a last resort,

     * in debug builds, send output to the debugger or any other

     * tool like DebugView which can monitor the output.

     */

    OutputDebugString(buf);

#endif

#else

    /* this -------------v--- guards NT-specific calls */

    if (check_winnt() && OPENSSL_isservice() > 0) {

        HANDLE hEventLog = RegisterEventSource(NULL, _T("OpenSSL"));

        if (hEventLog != NULL) {

            const TCHAR *pmsg = buf;

            if (!ReportEvent(hEventLog, EVENTLOG_ERROR_TYPE, 0, 0, NULL,

                    1, 0, &pmsg, NULL)) {

#if !defined(NDEBUG)

                /*

                 * We are in a situation where we tried to report a critical

                 * error and this failed for some reason. As a last resort,

                 * in debug builds, send output to the debugger or any other

                 * tool like DebugView which can monitor the output.

                 */

                OutputDebugString(pmsg);

#endif

            }

            (void)DeregisterEventSource(hEventLog);

        }

    } else {

        MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);

    }

#endif

#else

    MessageBox(NULL, buf, _T("OpenSSL: FATAL"), MB_OK | MB_ICONERROR);

#endif

}

#else

void OPENSSL_showfatal(const char *fmta, ...)

{

#ifndef OPENSSL_NO_STDIO

    va_list ap;

    va_start(ap, fmta);

    vfprintf(stderr, fmta, ap);

    va_end(ap);

#endif

}

int OPENSSL_isservice(void)

{

    return 0;

}

#endif

void OPENSSL_die(const char *message, const char *file, int line)

{

    OPENSSL_showfatal("%s:%d: OpenSSL internal error: %s\n",

        file, line, message);

#if !defined(_WIN32) || defined(OPENSSL_SYS_UEFI)

    abort();

#else

    /*

     * Win32 abort() customarily shows a dialog, but we just did that...

     */

    raise(SIGABRT);

    _exit(3);

#endif

}

#if defined(__TANDEM) && defined(OPENSSL_VPROC)

/*

 * Define a VPROC function for HP NonStop build crypto library.

 * This is used by platform version identification tools.

 * Do not inline this procedure or make it static.

 */

#define OPENSSL_VPROC_STRING_(x) x##_CRYPTO

#define OPENSSL_VPROC_STRING(x) OPENSSL_VPROC_STRING_(x)

#define OPENSSL_VPROC_FUNC OPENSSL_VPROC_STRING(OPENSSL_VPROC)

void OPENSSL_VPROC_FUNC(void) { }

#endif /* __TANDEM */