313 lines
9.7 KiB
C++
313 lines
9.7 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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dhcp.cpp
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Abstract:
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Code to allow RIS to automatically authorize for DHCP.
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Author:
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Hugh Leather (hughleat) 25-July-2000
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Revision History:
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--*/
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#include "pch.h"
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#include "dhcpapi.h"
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#include "dhcp.h"
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#include "setup.h"
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DEFINE_MODULE("DHCP");
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PSTR
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pSetupUnicodeToMultiByte(
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IN PCWSTR UnicodeString,
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IN UINT Codepage
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)
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/*++
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Routine Description:
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Convert a string from unicode to ansi.
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Arguments:
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UnicodeString - supplies string to be converted.
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Codepage - supplies codepage to be used for the conversion.
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Return Value:
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NULL if out of memory or invalid codepage.
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Caller can free buffer with pSetupFree().
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--*/
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{
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UINT WideCharCount;
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PSTR String;
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UINT StringBufferSize;
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UINT BytesInString;
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PSTR p;
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WideCharCount = lstrlenW(UnicodeString) + 1;
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//
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// Allocate maximally sized buffer.
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// If every unicode character is a double-byte
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// character, then the buffer needs to be the same size
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// as the unicode string. Otherwise it might be smaller,
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// as some unicode characters will translate to
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// single-byte characters.
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//
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StringBufferSize = WideCharCount * 2;
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String = new char[StringBufferSize];
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if(String == NULL) {
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return(NULL);
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}
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//
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// Perform the conversion.
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//
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BytesInString = WideCharToMultiByte(
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Codepage,
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0, // default composite char behavior
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UnicodeString,
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WideCharCount,
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String,
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StringBufferSize,
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NULL,
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NULL
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);
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if(BytesInString == 0) {
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delete(String);
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return(NULL);
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}
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return(String);
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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// Dhcp Authorization
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// ------------------
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// Authorization works like this:
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// S <- List of authorized servers (from call to DhcpEnumServers)
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// I <- IP addresses for this machine (from gethostaddr( 0 ))
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// c <- fully qualified physical DNS name of local machine (from GetComputerNameEx)
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// for each i such that i is a member of I and i is not a member of S do
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// Authorize( i, c ) (by a call to DhcpAddServer)
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//
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// Aurguments
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// hDlg
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// Parent window (only used for displaying message boxes modally). Can be NULL.
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//
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// Returns
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// Whatever error code is first generated (or ERROR_SUCCESS if none). A message box will
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// be displayed if there is an error.
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//
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// Used By
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// This code is only used by dialogs.cpp
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//////////////////////////////////////////////////////////////////////////////////////////////
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HRESULT AuthorizeDhcp( HWND hDlg ) {
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DWORD err;
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PWCHAR computer_name = 0;
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// Have to use a dll for dhcp authorization function.
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// This code loads them.
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HMODULE module;
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DWORD ( __stdcall *EnumServersFn )( DWORD, void* , DHCP_SERVER_INFO_ARRAY** ,void* ,void* );
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DWORD ( __stdcall *AddServerFn )( DWORD, void* , DHCP_SERVER_INFO* ,void* ,void* );
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module = LoadLibraryA( "dhcpsapi.dll" );
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if( module ) {
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EnumServersFn = ( DWORD ( __stdcall * )( DWORD, void* , DHCP_SERVER_INFO_ARRAY** ,void* ,void* )) GetProcAddress( module, "DhcpEnumServers" );
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if( !EnumServersFn ) {
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err = GetLastError();
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DebugMsg( "GetProcAddress(DhcpEnumServers) failed, ec = %d\n", err );
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goto fail;
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}
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AddServerFn = ( DWORD ( __stdcall * )( DWORD, void* , DHCP_SERVER_INFO* ,void* ,void* )) GetProcAddress( module, "DhcpAddServer" );
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if( !AddServerFn ) {
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err = GetLastError();
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DebugMsg( "GetProcAddress(DhcpAddServer) failed, ec = %d\n", err );
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goto fail;
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}
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}
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else {
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err = GetLastError();
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DebugMsg( "LoadLibrary failed, ec = %d\n", err );
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goto fail;
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}
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// We need the list of ip addresses associated with this machine. This we do through sockets.
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HOSTENT* host;
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#if 0
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DWORD ip;
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ip = 0;
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host = gethostbyaddr(( const char* )&ip, sizeof( DWORD ), AF_INET );
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if( host == NULL ) {
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err = WSAGetLastError();
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DebugMsg( "gethostbyaddr failed, ec = %d\n", err );
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goto fail;
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}
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if( host->h_addrtype != AF_INET || host->h_length != sizeof( DWORD )) {
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err = E_FAIL;
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DebugMsg( "gethostbyaddr returned invalid data\n" );
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goto fail;
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}
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#endif
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// We get the entire list of dhcp servers.
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DHCP_SERVER_INFO_ARRAY* _servers;
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if(( err = EnumServersFn( 0, NULL, &_servers, NULL, NULL )) != ERROR_SUCCESS ) {
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//
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// if this API fails, it will fail with a private DCHP error code that has
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// no win32 mapping. So set the error code to something generic and
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// reasonable.
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//
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DebugMsg( "DhcpEnumServers failed, ec = %d\n", err );
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err = ERROR_DS_GENERIC_ERROR;
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goto fail;
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}
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// We will need the name of the machine if we have to authorize it. Get the physical name as I'm not sure I trust what happens in the
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// clustered case.
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DWORD computer_name_len;
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computer_name_len = MAX_COMPUTERNAME_LENGTH * 2; // Allow for extra DNS characters.
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computer_name = new WCHAR[ MAX_COMPUTERNAME_LENGTH * 2 ];
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if (!computer_name) {
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err = ERROR_NOT_ENOUGH_MEMORY;
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DebugMsg( "new failed, ec = %d\n", err );
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goto fail;
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}
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if( !GetComputerNameEx( ComputerNamePhysicalDnsFullyQualified, computer_name, &computer_name_len )) {
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err = GetLastError();
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if( err == ERROR_MORE_DATA ) {
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delete [] computer_name;
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computer_name = new WCHAR[ computer_name_len ];
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if (!computer_name) {
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err = ERROR_NOT_ENOUGH_MEMORY;
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DebugMsg( "new failed, ec = %d\n", err );
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goto fail;
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}
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if( !GetComputerNameEx( ComputerNamePhysicalDnsFullyQualified, computer_name, &computer_name_len )) {
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err = GetLastError();
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DebugMsg( "GetComputerNameEx failed, ec = %d\n", err );
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goto fail;
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}
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}
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else goto fail;
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}
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DebugMsg( "ComputerName = %s\n", computer_name );
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#if 1
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char ComputerNameA[400];
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DWORD ip;
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WideCharToMultiByte(CP_ACP,
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0, // default composite char behavior
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computer_name,
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-1,
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ComputerNameA,
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400,
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NULL,
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NULL
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);
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host = gethostbyname( ComputerNameA );
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if( host == NULL ) {
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err = WSAGetLastError();
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DebugMsg( "gethostbyaddr failed, ec = %d\n", err );
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goto fail;
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}
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if( host->h_addrtype != AF_INET || host->h_length != sizeof( DWORD )) {
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err = E_FAIL;
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DebugMsg( "gethostbyaddr returned invalid data\n" );
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goto fail;
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}
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#endif
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// Cool now that we have all of that jazz, we can check that each of our ip addresses is authorized.
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for( PCHAR* i = host->h_addr_list; *i != 0; ++i ) {
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ip = ntohl( *( DWORD* )*i );
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DebugMsg( "searching server list for %d.%d.%d.%d\n",
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ip & 0xFF,
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(ip >> 8) & 0xFF,
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(ip >> 16) & 0xFF,
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(ip >> 24) & 0xFF );
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BOOL this_address_authorized = FALSE;
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for( unsigned j = 0; j < _servers->NumElements; ++j ) {
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DebugMsg( "server list entry: %d.%d.%d.%d\n",
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_servers->Servers[ j ].ServerAddress & 0xFF,
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(_servers->Servers[ j ].ServerAddress >> 8) & 0xFF,
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(_servers->Servers[ j ].ServerAddress >> 16) & 0xFF,
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(_servers->Servers[ j ].ServerAddress >> 24) & 0xFF );
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if( _servers->Servers[ j ].ServerAddress == ip ) {
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DebugMsg("found a match in list\n");
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this_address_authorized = TRUE;
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err = ERROR_SUCCESS;
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break;
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}
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}
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if( !this_address_authorized ) {
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// Authorize it!
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DHCP_SERVER_INFO server_info = { 0 };
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server_info.ServerAddress = ip;
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server_info.ServerName = computer_name;
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DebugMsg("authorizing %s (%d.%d.%d.%d)\n",
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server_info.ServerName,
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server_info.ServerAddress & 0xFF,
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(server_info.ServerAddress >> 8) & 0xFF,
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(server_info.ServerAddress >> 16) & 0xFF,
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(server_info.ServerAddress >> 24) & 0xFF);
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err = AddServerFn( 0, NULL, &server_info, NULL, NULL );
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if( err != ERROR_SUCCESS ) {
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//
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// if this API fails, it will fail with a private DCHP error code that has
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// no win32 mapping. So set the error code to something generic and
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// reasonable.
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//
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DebugMsg("DhcpAddServer failed, ec = %d\n",
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err
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);
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err = ERROR_DS_GENERIC_ERROR;
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goto fail;
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}
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} else {
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DebugMsg("skipping authorization of interface, it's already authorized\n");
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}
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}
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err = ERROR_SUCCESS;
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goto exit;
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fail :
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MessageBoxFromStrings(
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hDlg,
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IDS_AUTHORIZING_DHCP,
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IDS_AUTHORIZE_DHCP_FAILURE,
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MB_OK | MB_ICONERROR );
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exit :
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if (computer_name) {
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delete [] computer_name;
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}
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return HRESULT_FROM_WIN32( err );
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}
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