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