Source code of Windows XP (NT5)
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//---------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1992 - 1995
//
// File: parse.cxx
//
// Contents: NDS Pathname Parser
//
// The Pathname Parser is a key component in ADs providers. It checks for
// syntactic validity of an ADs pathname that has been passed to this
// provider. If the syntax is valid, then an OBJECTINFO structure is
// constructed. This OBJECTINFO structure contains a componentized version
// of the ADs pathname for this object.
//
// Note all that is being done is a syntax check. Rather than special-case
// every single new nuance to pathnames, all path checking must conform to
// the grammar rules laid out by the parser.
//
//
//
// History:
//----------------------------------------------------------------------------
#include "nds.hxx"
#pragma hdrstop
// Object -> PathName, Type, eos
// Object -> PathName, eos
//+---------------------------------------------------------------------------
// Function: ADsObject
//
// Synopsis: parses an ADs pathname passed to this provider. This function
// parses the following grammar rules
//
// <ADsObject> -> <ProviderName> <NDSObject>
//
//
// Arguments: [CLexer * pTokenizer] - a lexical analyzer object
// [POBJECTINFO pObjectInfo] - a pointer to an OBJECTINFO structure
//
// Returns: [HRESULT] 0 if successful, error HRESULT if not
//
// Modifies: pTokenizer (consumes the input buffer)
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
ADsObject(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = ProviderName(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
switch (dwToken) {
case TOKEN_END:
RRETURN(S_OK);
case TOKEN_COMMA:
hr = Type(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken == TOKEN_END) {
RRETURN(S_OK);
}else {
RRETURN(E_ADS_BAD_PATHNAME);
}
default:
hr = pTokenizer->PushBackToken();
hr = NDSObject(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
switch (dwToken) {
case TOKEN_END:
RRETURN(S_OK);
case TOKEN_COMMA:
hr = Type(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken == TOKEN_END) {
RRETURN(S_OK);
}else {
RRETURN(E_ADS_BAD_PATHNAME);
}
default:
RRETURN(E_FAIL);
}
}
cleanup:
RRETURN(hr);
}
//+---------------------------------------------------------------------------
// Function: NDSObject
//
// Synopsis: parses an ADs pathname passed to this provider. This function
// parses the following grammar rules
//
// <NDSObject> -> "\\""identifier""\" <PathName>
//
//
// Arguments: [CLexer * pTokenizer] - a lexical analyzer object
// [POBJECTINFO pObjectInfo] - a pointer to an OBJECTINFO structure
//
// Returns: [HRESULT] 0 if successful, error HRESULT if not
//
// Modifies: pTokenizer (consumes the input buffer)
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
NDSObject(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szToken[MAX_TOKEN_LENGTH];
WCHAR szDisplayToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if ((dwToken != TOKEN_FSLASH) ) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if ((dwToken != TOKEN_FSLASH) ) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = pTokenizer->GetNextToken(szToken, szDisplayToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_IDENTIFIER) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = AddTreeName(pObjectInfo, szToken, szDisplayToken );
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
//
// If we get an TOKEN_END, then we have a tree name only \\<tree_name>
//
if (dwToken == TOKEN_END || dwToken == TOKEN_COMMA) {
hr = pTokenizer->PushBackToken();
RRETURN(S_OK);
}
if ((dwToken != TOKEN_FSLASH) ) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = PathName(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
cleanup:
RRETURN(hr);
}
HRESULT
ProviderName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken == TOKEN_ATSIGN) {
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_IDENTIFIER) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = AddProviderName(pObjectInfo, szToken);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_EXCLAMATION) {
RRETURN(E_ADS_BAD_PATHNAME);
}
}else if (dwToken == TOKEN_IDENTIFIER) {
hr = AddProviderName(pObjectInfo, szToken);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_COLON) {
RRETURN(E_ADS_BAD_PATHNAME);
}
}else {
RRETURN(E_ADS_BAD_PATHNAME);
}
//
// You can now disable the processing for "@" and "!" treat them
// as ordinary characters.
//
pTokenizer->SetAtDisabler(TRUE);
RRETURN(S_OK);
cleanup:
RRETURN(hr);
}
// PathName -> Component \\ PathName
// PathName -> Component
HRESULT
DsPathName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if ((dwToken != TOKEN_FSLASH) ) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if ((dwToken != TOKEN_FSLASH) ) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = PathName(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
RRETURN(S_OK);
cleanup:
RRETURN(hr);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
PathName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
HRESULT hr;
WCHAR szToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
hr = Component(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
if ((dwToken == TOKEN_FSLASH) ) {
RRETURN (PathName(pTokenizer, pObjectInfo));
}else {
hr = pTokenizer->PushBackToken();
RRETURN (S_OK);
}
cleanup:
RRETURN(hr);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis: Component -> <identifier>
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
Component(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szValue[MAX_TOKEN_LENGTH];
WCHAR szDisplayValue[MAX_TOKEN_LENGTH];
WCHAR szEqual[MAX_TOKEN_LENGTH];
WCHAR szComponent[MAX_TOKEN_LENGTH];
WCHAR szDisplayComponent[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = pTokenizer->GetNextToken(szComponent, szDisplayComponent, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_IDENTIFIER) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = pTokenizer->GetNextToken(szEqual, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken == TOKEN_EQUAL) {
hr = pTokenizer->GetNextToken(szValue, szDisplayValue, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_IDENTIFIER) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = AddComponent(
pObjectInfo,
szComponent,
szValue,
szDisplayComponent,
szDisplayValue
);
BAIL_IF_ERROR(hr);
}else {
hr = AddComponent(pObjectInfo, szComponent, NULL, szDisplayComponent, NULL);
BAIL_IF_ERROR(hr);
hr = pTokenizer->PushBackToken();
BAIL_IF_ERROR(hr);
}
RRETURN(S_OK);
cleanup:
RRETURN(hr);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
CLexer::CLexer(LPWSTR szBuffer):
_ptr(NULL),
_Buffer(NULL),
_dwLastTokenLength(0),
_dwLastToken(0),
_dwEndofString(0),
_bAtDisabled(FALSE)
{
if (!szBuffer || !*szBuffer) {
return;
}
_Buffer = AllocADsStr(szBuffer);
_ptr = _Buffer;
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 08-12-96 t-danal Created.
//
//----------------------------------------------------------------------------
CLexer::~CLexer()
{
FreeADsStr(_Buffer);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
CLexer::GetNextToken(LPWSTR szToken, LPWSTR szDisplayToken, LPDWORD pdwToken)
{
WCHAR c;
DWORD state = 0;
LPWSTR pch = szToken;
LPWSTR pDisplayCh = szDisplayToken;
BOOL fEscapeOn = FALSE, fQuotingOn = FALSE;
memset(szToken, 0, sizeof(WCHAR) * MAX_TOKEN_LENGTH);
if (szDisplayToken) {
memset(szDisplayToken, 0, sizeof(TCHAR) * MAX_TOKEN_LENGTH);
}
_dwLastTokenLength = 0;
while (1) {
c = NextChar();
switch (state) {
case 0:
*pch++ = c;
_dwLastTokenLength++;
if (c == TEXT('"')) {
//
// Quoting;
//
fQuotingOn = TRUE;
pch--;
state = 1;
}else if (c == TEXT('\\')) {
//
// Escaping; Ignore the '\' in the token and check to make
// sure that the next character exists
//
pch--;
fEscapeOn = TRUE;
state = 1;
}else if (c == L'/') {
*pdwToken = TOKEN_FSLASH;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else if (c == L',') {
*pdwToken = TOKEN_COMMA;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else if (c == L'='){
*pdwToken = TOKEN_EQUAL;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
/*
}else if (c == L'.'){
*pdwToken = TOKEN_PERIOD;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
*/
}else if (c == L':'){
if (!_bAtDisabled) {
*pdwToken = TOKEN_COLON;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else {
state = 1;
}
}else if (c == TEXT('<')) {
RRETURN(E_FAIL);
}else if (c == TEXT('>')) {
RRETURN(E_FAIL);
}else if (c == L'\0'){
*pdwToken = TOKEN_END;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else if (c == L'@') {
if (!_bAtDisabled) {
*pdwToken = TOKEN_ATSIGN;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else {
state = 1;
}
}else if (c == L'!'){
if (!_bAtDisabled) {
*pdwToken = TOKEN_EXCLAMATION;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else {
state = 1;
}
}else {
state = 1;
}
break;
case 1:
if ((fEscapeOn || fQuotingOn) && c == TEXT('\0') ) {
RRETURN(E_FAIL);
}
else if (fEscapeOn) {
fEscapeOn = FALSE;
*pch++ = c;
_dwLastTokenLength++;
state = 1;
break;
}
else if (fQuotingOn) {
if (c == TEXT('"')) {
fQuotingOn = FALSE;
}
else {
*pch++ = c;
}
_dwLastTokenLength++;
break;
}
else if (c == TEXT('\\') ) {
fEscapeOn = TRUE;
_dwLastTokenLength++;
break;
}
else if (c == TEXT('"')) {
fQuotingOn = TRUE;
_dwLastTokenLength++;
break;
}
else if (c == L'\0' || c == L',' ||
c == L'=' || c == L'/') {
PushbackChar();
*pdwToken = TOKEN_IDENTIFIER;
_dwLastToken = *pdwToken;
RRETURN (S_OK);
}else if (c == L'@' || c == L'!' || c == L':' ) {
if (!_bAtDisabled) {
PushbackChar();
*pdwToken = TOKEN_IDENTIFIER;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else {
*pch++ = c;
_dwLastTokenLength++;
state = 1;
break;
}
}else {
*pch++ = c;
_dwLastTokenLength++;
state = 1;
break;
}
default:
RRETURN(E_FAIL);
}
if (pDisplayCh) {
*pDisplayCh++ = c;
}
}
}
HRESULT
CLexer::GetNextToken(LPWSTR szToken, LPDWORD pdwToken)
{
RRETURN (GetNextToken(szToken, NULL, pdwToken));
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
WCHAR
CLexer::NextChar()
{
if (_ptr == NULL || *_ptr == L'\0') {
_dwEndofString = TRUE;
return(L'\0');
}
return(*_ptr++);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
CLexer::PushBackToken()
{
if (_dwLastToken == TOKEN_END) {
RRETURN(S_OK);
}
_ptr -= _dwLastTokenLength;
RRETURN(S_OK);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
void
CLexer::PushbackChar()
{
if (_dwEndofString) {
return;
}
_ptr--;
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
BOOL
CLexer::IsKeyword(LPWSTR szToken, LPDWORD pdwToken)
{
DWORD i = 0;
for (i = 0; i < MAX_KEYWORDS; i++) {
if (!_wcsicmp(szToken, KeywordList[i].Keyword)) {
*pdwToken = KeywordList[i].dwTokenId;
return(TRUE);
}
}
*pdwToken = 0;
return(FALSE);
}
//+---------------------------------------------------------------------------
//Function:
//
//Synopsis:
//
//Arguments:
//
//Returns:
//
//Modifies:
//
//History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
AddComponent(
POBJECTINFO pObjectInfo,
LPWSTR szComponent,
LPWSTR szValue,
LPWSTR szDisplayComponent,
LPWSTR szDisplayValue
)
{
if (!szComponent || !*szComponent || !szDisplayComponent || !*szDisplayComponent) {
RRETURN(E_FAIL);
}
if (pObjectInfo->NumComponents < MAXCOMPONENTS) {
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szComponent =
AllocADsStr(szComponent);
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szValue =
AllocADsStr(szValue);
pObjectInfo->DisplayComponentArray[pObjectInfo->NumComponents].szComponent =
AllocADsStr(szDisplayComponent);
pObjectInfo->DisplayComponentArray[pObjectInfo->NumComponents].szValue =
AllocADsStr(szDisplayValue);
pObjectInfo->NumComponents++;
RRETURN(S_OK);
}else {
RRETURN(E_ADS_BAD_PATHNAME);
}
}
HRESULT
AddProviderName(POBJECTINFO pObjectInfo, LPWSTR szToken)
{
if (!szToken || !*szToken) {
RRETURN(E_FAIL);
}
pObjectInfo->ProviderName = AllocADsStr(szToken);
RRETURN(S_OK);
}
HRESULT
AddTreeName(POBJECTINFO pObjectInfo, LPWSTR szToken, LPWSTR szDisplayToken)
{
if (!szToken || !*szToken || !szDisplayToken || !*szDisplayToken) {
RRETURN(E_FAIL);
}
pObjectInfo->TreeName = AllocADsStr(szToken);
pObjectInfo->DisplayTreeName = AllocADsStr(szDisplayToken);
RRETURN(S_OK);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
SetType(POBJECTINFO pObjectInfo, DWORD dwToken)
{
pObjectInfo->ObjectType = dwToken;
RRETURN(S_OK);
}
// Type -> "user", "group","printer","service", "fileservice"
//+---------------------------------------------------------------------------
// Function: Type
//
// Synopsis: Parses Type-> "user" | "group" etc
//
// Arguments: [CLexer * pTokenizer]
// [POBJECTINFo pObjectInfo]
//
// Returns: HRESULT
//
// Modifies: -
//
// History: 11-3-95 krishnag Created.
//
//----------------------------------------------------------------------------
HRESULT
Type(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szToken[MAX_PATH];
DWORD dwToken;
HRESULT hr = E_FAIL;
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken == TOKEN_IDENTIFIER ) {
if (pTokenizer->IsKeyword(szToken, &dwToken)) {
pObjectInfo->ClassName = AllocADsStr(szToken);
}
RRETURN(hr);
}
cleanup:
RRETURN(hr);
}
void
CLexer::SetAtDisabler(
BOOL bFlag
)
{
_bAtDisabled = bFlag;
}
BOOL
CLexer::GetAtDisabler()
{
return(_bAtDisabled);
}