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From "Dave Meier (JIRA)" <j...@apache.org>
Subject [jira] Created: (AXIS2C-939) IIS Module does not set dll path and LoadLibrary call does not specify libraries current dir as start of search path
Date Mon, 28 Jan 2008 19:55:34 GMT
IIS Module does not set dll path and LoadLibrary call does not specify libraries current dir
as start of search path
--------------------------------------------------------------------------------------------------------------------

                 Key: AXIS2C-939
                 URL: https://issues.apache.org/jira/browse/AXIS2C-939
             Project: Axis2-C
          Issue Type: Bug
          Components: transport/http
    Affects Versions: Current (Nightly)
         Environment: Windows XP, IIS 5.1
            Reporter: Dave Meier
            Priority: Blocker


I have a services dll that depends on other dlls.  When I use axis2_http_server.exe it works
fine, but under the IIS module, my service dll fails to load with a "Failed in creating DLL"
message.

I modified the code and was able to get it to work and can provide a diff once I learn how
to do that.  The change involved setting the dll path in the IIS module code and modifying
the LoadLibrary call that Axis2C uses to load the service dll.  The second change involves
telling LoadLibrary to search the same directory where the dll is located first when looking
for other dlls that the service dll depends upon.  This change avoids a problem where an incorrect
dll is picked up from somewhere else in the search path (aka "dll hell").

------------------------------------------------------------------------------------------------------------------------------
Change 1 - file "axis2_isapi_plugin.c", method "HttpExtensionProc(LPEXTENSION_CONTROL_BLOCK
lpECB)"
------------------------------------------------------------------------------------------------------------------------------

    DWORD WINAPI HttpExtensionProc(LPEXTENSION_CONTROL_BLOCK lpECB) 

{

    DWORD rc = HSE_STATUS_ERROR;
    lpECB->dwHttpStatusCode = HTTP_INTERNAL_SERVER_ERROR;
    if (axis2_worker)
    {
        // windows cannot find the correct dlls unless the dir is set
        // but we want to reset to previous dir after the load
        char szOriginalPath[_MAX_PATH + 1];
        char szPath[_MAX_PATH + 1];
        DWORD dwBufferSize = 0;
        ZeroMemory(szOriginalPath, sizeof szOriginalPath);
        dwBufferSize = sizeof szOriginalPath;
#if _WIN32_WINNT >= 0x0502 // we stop supporting old WIN OSs
        GetDllDirectory( dwBufferSize, szOriginalPath );
#else
        GetCurrentDirectory( dwBufferSize, szOriginalPath );
#endif // _WIN32_WINNT >= 0x050

        ZeroMemory(szPath, sizeof szPath);
        dwBufferSize = sizeof szPath;
        lpECB->GetServerVariable(lpECB->ConnID, "APPL_PHYSICAL_PATH", szPath, &dwBufferSize);
        if ( strlen( szPath ) > 0 )
        {
            // windows cannot find the correct dlls unless the path is set
#if _WIN32_WINNT >= 0x0502 // we stop supporting old WIN OSs
            SetDllDirectory( szPath );
#else
            SetCurrentDirectory( szPath );
#endif // _WIN32_WINNT >= 0x050
        }


        AXIS2_IIS_WORKER_PROCESS_REQUEST(axis2_worker, axutil_env, lpECB);

        // windows cannot find the correct dlls unless the dir is set
        // but we want to reset to previous dir after the load
#if _WIN32_WINNT >= 0x0502 // we stop supporting old WIN OSs
        SetDllDirectory( szOriginalPath );
#else
        SetCurrentDirectory( szOriginalPath );
#endif // _WIN32_WINNT >= 0x050
    }
    else
        return HSE_STATUS_ERROR;

    return HSE_STATUS_SUCCESS;
}


------------------------------------------------------------------------------------------------------------------------------
Change 2 - file "axutil_windows.c", method "callLoadLib(char *lib)":
------------------------------------------------------------------------------------------------------------------------------

    return LoadLibraryEx(lib, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);  // was "return LoadLibrary(lib);"



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