Add unmodified system_win32.c of cURL as lib/loadlibrary.c
Exact revision / source:
f7df67cff0/lib/system_win32.c
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Sebastian Pipping
parent
71bb94f591
commit
d1751bb60e
329
expat/lib/loadlibrary.c
Normal file
329
expat/lib/loadlibrary.c
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 2016 - 2017, Steve Holme, <steve_holme@hotmail.com>.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if defined(WIN32)
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#include <curl/curl.h>
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#include "system_win32.h"
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/* The last #include files should be: */
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#include "curl_memory.h"
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#include "memdebug.h"
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#if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
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defined(USE_WINSOCK))
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#if !defined(LOAD_WITH_ALTERED_SEARCH_PATH)
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#define LOAD_WITH_ALTERED_SEARCH_PATH 0x00000008
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#endif
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#if !defined(LOAD_LIBRARY_SEARCH_SYSTEM32)
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#define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800
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#endif
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/* We use our own typedef here since some headers might lack these */
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typedef HMODULE (APIENTRY *LOADLIBRARYEX_FN)(LPCTSTR, HANDLE, DWORD);
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/* See function definitions in winbase.h */
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#ifdef UNICODE
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# ifdef _WIN32_WCE
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# define LOADLIBARYEX L"LoadLibraryExW"
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# else
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# define LOADLIBARYEX "LoadLibraryExW"
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# endif
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#else
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# define LOADLIBARYEX "LoadLibraryExA"
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#endif
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#endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
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/*
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* Curl_verify_windows_version()
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*
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* This is used to verify if we are running on a specific windows version.
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*
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* Parameters:
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*
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* majorVersion [in] - The major version number.
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* minorVersion [in] - The minor version number.
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* platform [in] - The optional platform identifier.
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* condition [in] - The test condition used to specifier whether we are
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* checking a version less then, equal to or greater than
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* what is specified in the major and minor version
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* numbers.
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*
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* Returns TRUE if matched; otherwise FALSE.
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*/
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bool Curl_verify_windows_version(const unsigned int majorVersion,
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const unsigned int minorVersion,
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const PlatformIdentifier platform,
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const VersionCondition condition)
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{
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bool matched = FALSE;
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#if defined(CURL_WINDOWS_APP)
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/* We have no way to determine the Windows version from Windows apps,
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so let's assume we're running on the target Windows version. */
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const WORD fullVersion = MAKEWORD(minorVersion, majorVersion);
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const WORD targetVersion = (WORD)_WIN32_WINNT;
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switch(condition) {
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case VERSION_LESS_THAN:
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matched = targetVersion < fullVersion;
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break;
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case VERSION_LESS_THAN_EQUAL:
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matched = targetVersion <= fullVersion;
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break;
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case VERSION_EQUAL:
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matched = targetVersion == fullVersion;
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break;
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case VERSION_GREATER_THAN_EQUAL:
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matched = targetVersion >= fullVersion;
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break;
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case VERSION_GREATER_THAN:
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matched = targetVersion > fullVersion;
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break;
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}
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if(matched && (platform == PLATFORM_WINDOWS)) {
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/* we're always running on PLATFORM_WINNT */
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matched = FALSE;
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}
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#elif !defined(_WIN32_WINNT) || !defined(_WIN32_WINNT_WIN2K) || \
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(_WIN32_WINNT < _WIN32_WINNT_WIN2K)
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OSVERSIONINFO osver;
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memset(&osver, 0, sizeof(osver));
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osver.dwOSVersionInfoSize = sizeof(osver);
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/* Find out Windows version */
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if(GetVersionEx(&osver)) {
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/* Verify the Operating System version number */
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switch(condition) {
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case VERSION_LESS_THAN:
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if(osver.dwMajorVersion < majorVersion ||
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(osver.dwMajorVersion == majorVersion &&
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osver.dwMinorVersion < minorVersion))
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matched = TRUE;
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break;
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case VERSION_LESS_THAN_EQUAL:
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if(osver.dwMajorVersion <= majorVersion &&
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osver.dwMinorVersion <= minorVersion)
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matched = TRUE;
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break;
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case VERSION_EQUAL:
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if(osver.dwMajorVersion == majorVersion &&
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osver.dwMinorVersion == minorVersion)
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matched = TRUE;
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break;
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case VERSION_GREATER_THAN_EQUAL:
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if(osver.dwMajorVersion >= majorVersion &&
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osver.dwMinorVersion >= minorVersion)
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matched = TRUE;
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break;
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case VERSION_GREATER_THAN:
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if(osver.dwMajorVersion > majorVersion ||
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(osver.dwMajorVersion == majorVersion &&
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osver.dwMinorVersion > minorVersion))
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matched = TRUE;
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break;
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}
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/* Verify the platform identifier (if necessary) */
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if(matched) {
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switch(platform) {
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case PLATFORM_WINDOWS:
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if(osver.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
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matched = FALSE;
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break;
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case PLATFORM_WINNT:
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if(osver.dwPlatformId != VER_PLATFORM_WIN32_NT)
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matched = FALSE;
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default: /* like platform == PLATFORM_DONT_CARE */
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break;
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}
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}
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}
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#else
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ULONGLONG cm = 0;
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OSVERSIONINFOEX osver;
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BYTE majorCondition;
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BYTE minorCondition;
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BYTE spMajorCondition;
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BYTE spMinorCondition;
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switch(condition) {
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case VERSION_LESS_THAN:
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majorCondition = VER_LESS;
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minorCondition = VER_LESS;
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spMajorCondition = VER_LESS_EQUAL;
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spMinorCondition = VER_LESS_EQUAL;
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break;
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case VERSION_LESS_THAN_EQUAL:
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majorCondition = VER_LESS_EQUAL;
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minorCondition = VER_LESS_EQUAL;
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spMajorCondition = VER_LESS_EQUAL;
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spMinorCondition = VER_LESS_EQUAL;
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break;
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case VERSION_EQUAL:
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majorCondition = VER_EQUAL;
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minorCondition = VER_EQUAL;
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spMajorCondition = VER_GREATER_EQUAL;
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spMinorCondition = VER_GREATER_EQUAL;
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break;
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case VERSION_GREATER_THAN_EQUAL:
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majorCondition = VER_GREATER_EQUAL;
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minorCondition = VER_GREATER_EQUAL;
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spMajorCondition = VER_GREATER_EQUAL;
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spMinorCondition = VER_GREATER_EQUAL;
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break;
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case VERSION_GREATER_THAN:
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majorCondition = VER_GREATER;
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minorCondition = VER_GREATER;
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spMajorCondition = VER_GREATER_EQUAL;
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spMinorCondition = VER_GREATER_EQUAL;
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break;
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default:
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return FALSE;
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}
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memset(&osver, 0, sizeof(osver));
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osver.dwOSVersionInfoSize = sizeof(osver);
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osver.dwMajorVersion = majorVersion;
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osver.dwMinorVersion = minorVersion;
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if(platform == PLATFORM_WINDOWS)
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osver.dwPlatformId = VER_PLATFORM_WIN32_WINDOWS;
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else if(platform == PLATFORM_WINNT)
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osver.dwPlatformId = VER_PLATFORM_WIN32_NT;
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cm = VerSetConditionMask(cm, VER_MAJORVERSION, majorCondition);
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cm = VerSetConditionMask(cm, VER_MINORVERSION, minorCondition);
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cm = VerSetConditionMask(cm, VER_SERVICEPACKMAJOR, spMajorCondition);
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cm = VerSetConditionMask(cm, VER_SERVICEPACKMINOR, spMinorCondition);
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if(platform != PLATFORM_DONT_CARE)
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cm = VerSetConditionMask(cm, VER_PLATFORMID, VER_EQUAL);
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if(VerifyVersionInfo(&osver, (VER_MAJORVERSION | VER_MINORVERSION |
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VER_SERVICEPACKMAJOR | VER_SERVICEPACKMINOR),
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cm))
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matched = TRUE;
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#endif
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return matched;
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}
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#if defined(USE_WINDOWS_SSPI) || (!defined(CURL_DISABLE_TELNET) && \
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defined(USE_WINSOCK))
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/*
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* Curl_load_library()
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*
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* This is used to dynamically load DLLs using the most secure method available
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* for the version of Windows that we are running on.
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*
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* Parameters:
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*
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* filename [in] - The filename or full path of the DLL to load. If only the
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* filename is passed then the DLL will be loaded from the
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* Windows system directory.
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*
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* Returns the handle of the module on success; otherwise NULL.
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*/
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HMODULE Curl_load_library(LPCTSTR filename)
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{
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HMODULE hModule = NULL;
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LOADLIBRARYEX_FN pLoadLibraryEx = NULL;
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/* Get a handle to kernel32 so we can access it's functions at runtime */
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HMODULE hKernel32 = GetModuleHandle(TEXT("kernel32"));
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if(!hKernel32)
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return NULL;
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/* Attempt to find LoadLibraryEx() which is only available on Windows 2000
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and above */
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pLoadLibraryEx = (LOADLIBRARYEX_FN) GetProcAddress(hKernel32, LOADLIBARYEX);
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/* Detect if there's already a path in the filename and load the library if
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there is. Note: Both back slashes and forward slashes have been supported
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since the earlier days of DOS at an API level although they are not
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supported by command prompt */
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if(_tcspbrk(filename, TEXT("\\/"))) {
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/** !checksrc! disable BANNEDFUNC 1 **/
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hModule = pLoadLibraryEx ?
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pLoadLibraryEx(filename, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
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LoadLibrary(filename);
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}
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/* Detect if KB2533623 is installed, as LOAD_LIBARY_SEARCH_SYSTEM32 is only
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supported on Windows Vista, Windows Server 2008, Windows 7 and Windows
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Server 2008 R2 with this patch or natively on Windows 8 and above */
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else if(pLoadLibraryEx && GetProcAddress(hKernel32, "AddDllDirectory")) {
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/* Load the DLL from the Windows system directory */
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hModule = pLoadLibraryEx(filename, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
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}
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else {
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/* Attempt to get the Windows system path */
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UINT systemdirlen = GetSystemDirectory(NULL, 0);
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if(systemdirlen) {
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/* Allocate space for the full DLL path (Room for the null terminator
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is included in systemdirlen) */
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size_t filenamelen = _tcslen(filename);
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TCHAR *path = malloc(sizeof(TCHAR) * (systemdirlen + 1 + filenamelen));
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if(path && GetSystemDirectory(path, systemdirlen)) {
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/* Calculate the full DLL path */
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_tcscpy(path + _tcslen(path), TEXT("\\"));
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_tcscpy(path + _tcslen(path), filename);
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/* Load the DLL from the Windows system directory */
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/** !checksrc! disable BANNEDFUNC 1 **/
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hModule = pLoadLibraryEx ?
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pLoadLibraryEx(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH) :
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LoadLibrary(path);
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}
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free(path);
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}
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}
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return hModule;
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}
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#endif /* USE_WINDOWS_SSPI || (!CURL_DISABLE_TELNET && USE_WINSOCK) */
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#endif /* WIN32 */
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