IIS Module does not set dll path and LoadLibrary call does not specify
libraries current dir as start of search path
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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").
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Change 1 - file "axis2_isapi_plugin.c", method
"HttpExtensionProc(LPEXTENSION_CONTROL_BLOCK lpECB)"
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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;
}
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Change 2 - file "axutil_windows.c", method "callLoadLib(char *lib)":
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return LoadLibraryEx(lib, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); // was
"return LoadLibrary(lib);"
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