121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
|
/*++
|
||
|
|
|
||
|
|
Copyright (c) 1994 Microsoft Corporation
|
||
|
|
|
||
|
|
Module Name:
|
||
|
|
|
||
|
|
entity.c
|
||
|
|
|
||
|
|
Abstract:
|
||
|
|
|
||
|
|
This module contains functions to get the entity list from the TCP/IP
|
||
|
|
device driver
|
||
|
|
|
||
|
|
Contents:
|
||
|
|
GetEntityList
|
||
|
|
|
||
|
|
Author:
|
||
|
|
|
||
|
|
Richard L Firth (rfirth) 20-May-1994
|
||
|
|
|
||
|
|
Revision History:
|
||
|
|
|
||
|
|
20-May-1994 rfirth
|
||
|
|
Created
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
#include "precomp.h"
|
||
|
|
#pragma hdrstop
|
||
|
|
|
||
|
|
/*******************************************************************************
|
||
|
|
*
|
||
|
|
* GetEntityList
|
||
|
|
*
|
||
|
|
* Allocates a buffer for, and retrieves, the list of entities supported by the
|
||
|
|
* TCP/IP device driver
|
||
|
|
*
|
||
|
|
* ENTRY nothing
|
||
|
|
*
|
||
|
|
* EXIT EntityCount - number of entities in the buffer
|
||
|
|
*
|
||
|
|
* RETURNS Success - pointer to allocated buffer containing list of entities
|
||
|
|
* Failure - NULL
|
||
|
|
*
|
||
|
|
* ASSUMES
|
||
|
|
*
|
||
|
|
******************************************************************************/
|
||
|
|
|
||
|
|
TDIEntityID* GetEntityList(UINT* EntityCount) {
|
||
|
|
|
||
|
|
TCP_REQUEST_QUERY_INFORMATION_EX req;
|
||
|
|
DWORD status;
|
||
|
|
DWORD inputLen;
|
||
|
|
DWORD outputLen;
|
||
|
|
LPVOID buffer = NULL;
|
||
|
|
TDIEntityID* pEntity = NULL;
|
||
|
|
|
||
|
|
memset(&req, 0, sizeof(req));
|
||
|
|
|
||
|
|
req.ID.toi_entity.tei_entity = GENERIC_ENTITY;
|
||
|
|
req.ID.toi_entity.tei_instance = 0;
|
||
|
|
req.ID.toi_class = INFO_CLASS_GENERIC;
|
||
|
|
req.ID.toi_type = INFO_TYPE_PROVIDER;
|
||
|
|
req.ID.toi_id = ENTITY_LIST_ID;
|
||
|
|
|
||
|
|
inputLen = sizeof(req);
|
||
|
|
outputLen = sizeof(TDIEntityID) * DEFAULT_MINIMUM_ENTITIES;
|
||
|
|
|
||
|
|
//
|
||
|
|
// this is over-engineered - its very unlikely that we'll ever get >32
|
||
|
|
// entities returned, never mind >64K's worth
|
||
|
|
//
|
||
|
|
|
||
|
|
do {
|
||
|
|
|
||
|
|
DWORD previousOutputLen;
|
||
|
|
|
||
|
|
previousOutputLen = outputLen;
|
||
|
|
if (pEntity) {
|
||
|
|
ReleaseMemory((void*)pEntity);
|
||
|
|
}
|
||
|
|
pEntity = (TDIEntityID*)NEW_MEMORY((size_t)outputLen);
|
||
|
|
if (!pEntity) {
|
||
|
|
|
||
|
|
DEBUG_PRINT(("GetEntityList: failed to allocate entity buffer (%ld bytes)\n",
|
||
|
|
outputLen
|
||
|
|
));
|
||
|
|
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
status = WsControl(IPPROTO_TCP,
|
||
|
|
WSCNTL_TCPIP_QUERY_INFO,
|
||
|
|
(LPVOID)&req,
|
||
|
|
&inputLen,
|
||
|
|
(LPVOID)pEntity,
|
||
|
|
&outputLen
|
||
|
|
);
|
||
|
|
if (status == NO_ERROR) {
|
||
|
|
break;
|
||
|
|
} else if (status == ERROR_INSUFFICIENT_BUFFER) {
|
||
|
|
outputLen = previousOutputLen +
|
||
|
|
sizeof(TDIEntityID) * DEFAULT_MINIMUM_ENTITIES;
|
||
|
|
} else {
|
||
|
|
|
||
|
|
DEBUG_PRINT(("GetEntityList: WsControl(GENERIC_ENTITY) returns %ld, outputLen = %ld\n",
|
||
|
|
status,
|
||
|
|
outputLen
|
||
|
|
));
|
||
|
|
|
||
|
|
ReleaseMemory((void*)pEntity);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
} while ( TRUE );
|
||
|
|
|
||
|
|
DEBUG_PRINT(("%d entities returned\n", (outputLen / sizeof(TDIEntityID))));
|
||
|
|
|
||
|
|
*EntityCount = (UINT)(outputLen / sizeof(TDIEntityID));
|
||
|
|
return pEntity;
|
||
|
|
}
|