293 lines
6.3 KiB
C++
293 lines
6.3 KiB
C++
/*++
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Copyright (c) 1994 Microsoft Corporation
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Module Name:
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dhcp.c
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Abstract:
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Functions to get information from VDHCP.VXD
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Contents:
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(OpenDhcpVxdHandle)
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(DhcpVxdRequest)
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DhcpReleaseAdapterIpAddress
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DhcpRenewAdapterIpAddress
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(ReleaseOrRenewAddress)
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IsMediaDisconnected
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Author:
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Richard L Firth (rfirth) 30-Nov-1994
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Revision History:
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30-Nov-1994 rfirth
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Created
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--*/
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#include "stdafx.h"
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#include "NetConn.h"
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#include "w9xdhcp.h"
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#include "vxd32.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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//
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// Private constants.
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//
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#define DHCP_IS_MEDIA_DISCONNECTED 5
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#define PRIVATE static
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//
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// private prototypes
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//
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PRIVATE
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DWORD
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OpenDhcpVxdHandle(
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void
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);
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PRIVATE
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WORD
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DhcpVxdRequest(
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IN DWORD Handle,
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IN WORD Request,
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IN WORD BufferLength,
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OUT LPVOID Buffer
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);
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PRIVATE
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WORD
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ReleaseOrRenewAddress(
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UINT Request,
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UINT AddressLength,
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LPBYTE Address
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);
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//
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// data
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//
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//
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// functions
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//
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BOOL
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IsMediaDisconnected(
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IN OUT DWORD iae_context
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)
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{
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DWORD handle;
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handle = OpenDhcpVxdHandle();
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if( handle ) {
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WORD result;
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DWORD MediaStatus = iae_context;
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result = DhcpVxdRequest( handle,
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DHCP_IS_MEDIA_DISCONNECTED,
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sizeof(MediaStatus),
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&MediaStatus
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);
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OsCloseVxdHandle( handle );
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if( result == 0 && MediaStatus == TRUE ) return TRUE;
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}
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return FALSE;
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}
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/*******************************************************************************
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*
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* OpenDhcpVxdHandle
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*
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* On Snowball, just retrieves the (real-mode) entry point address to the VxD
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*
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* ENTRY nothing
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*
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* EXIT DhcpVxdEntryPoint set
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*
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* RETURNS DhcpVxdEntryPoint
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*
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* ASSUMES 1. We are running in V86 mode
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*
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******************************************************************************/
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PRIVATE DWORD
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OpenDhcpVxdHandle()
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{
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return OsOpenVxdHandle("VDHCP", VDHCP_Device_ID);
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}
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/*******************************************************************************
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*
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* DhcpVxdRequest
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*
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* Makes a DHCP VxD request - passes a function code, parameter buffer and
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* length to the (real-mode/V86) VxD entry-point
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*
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* ENTRY Handle - handle for Win32 call
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* Request - DHCP VxD request
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* BufferLength - length of Buffer
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* Buffer - pointer to request-specific parameters
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*
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* EXIT depends on request
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*
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* RETURNS Success - 0
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* Failure - ERROR_PATH_NOT_FOUND
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* Returned if a specified adapter address could not be
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* found
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*
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* ERROR_BUFFER_OVERFLOW
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* Returned if the supplied buffer is too small to contain
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* the requested information
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*
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* ASSUMES
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*
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******************************************************************************/
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PRIVATE WORD
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DhcpVxdRequest(DWORD Handle, WORD Request, WORD BufferLength, LPVOID Buffer)
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{
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return (WORD) OsSubmitVxdRequest( Handle,
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(INT)Request,
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(LPVOID)Buffer,
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(INT)BufferLength );
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}
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/*******************************************************************************
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*
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* DhcpReleaseAdapterIpAddress
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*
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* Attempts to release the IP address for an adapter
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*
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* ENTRY AdapterInfo - describing adapter to release address for
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*
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* EXIT nothing
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*
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* RETURNS Success - TRUE
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* Failure - FALSE
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*
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******************************************************************************/
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DWORD
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DhcpReleaseAdapterIpAddress(PADAPTER_INFO AdapterInfo)
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{
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WORD result;
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result = ReleaseOrRenewAddress(DHCP_RELEASE_IPADDRESS,
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AdapterInfo->AddressLength,
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AdapterInfo->Address
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);
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return (DWORD)result;
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}
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/*******************************************************************************
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*
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* DhcpRenewAdapterIpAddress
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*
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* Attempts to renew the IP address for an adapter
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*
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* ENTRY AdapterInfo - describing adapter to renew address for
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*
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* EXIT nothing
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*
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* RETURNS Success - TRUE
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* Failure - FALSE
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*
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* ASSUMES
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*
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******************************************************************************/
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DWORD
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DhcpRenewAdapterIpAddress(PADAPTER_INFO AdapterInfo)
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{
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WORD result;
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result = ReleaseOrRenewAddress(DHCP_RENEW_IPADDRESS,
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AdapterInfo->AddressLength,
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AdapterInfo->Address
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);
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return (DWORD)result;
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}
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/*******************************************************************************
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*
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* ReleaseOrRenewAddress
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*
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* Given a physical adapter address and length, renews or releases the IP
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* address lease for this adapter
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*
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* ENTRY Request - DHCP_RELEASE_IPADDRESS or DHCP_RENEW_IPADDRESS
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* AddressLength - length of Address
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* Address - pointer to byte array which is physical adapter
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* address
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*
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* EXIT nothing
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*
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* RETURNS Success - ERROR_SUCCESS
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* Failure - ERROR_NOT_ENOUGH_MEMORY
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* ERROR_FILE_NOT_FOUND
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* ERROR_PATH_NOT_FOUND
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* ERROR_BUFFER_OVERFLOW
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*
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* ASSUMES
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*
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******************************************************************************/
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PRIVATE WORD
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ReleaseOrRenewAddress(UINT Request, UINT AddressLength, LPBYTE Address)
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{
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DWORD handle;
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handle = OpenDhcpVxdHandle();
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if (handle)
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{
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LPDHCP_HW_INFO info;
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WORD result;
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WORD length;
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length = sizeof(DHCP_HW_INFO) + AddressLength;
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info = (LPDHCP_HW_INFO)LocalAlloc(LPTR, length);
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if (!info)
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{
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return ERROR_NOT_ENOUGH_MEMORY;
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}
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info->OffsetHardwareAddress = sizeof(*info);
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info->HardwareLength = AddressLength;
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memcpy(info + 1, Address, AddressLength);
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result = DhcpVxdRequest(handle, (WORD)Request, length, (LPVOID)info);
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OsCloseVxdHandle(handle);
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LocalFree(info);
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return result;
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}
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return ERROR_FILE_NOT_FOUND;
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}
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#ifdef __cplusplus
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}
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#endif
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