Source code of Windows XP (NT5)
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//---------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1992 - 1997.
//
// File: parse.cxx
//
// Contents: IIS 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 "iis.hxx"
#pragma hdrstop
KWDLIST KeywordList[MAX_KEYWORDS] =
{
{ TOKEN_SCHEMA, SCHEMA_CLASS_NAME},
{ TOKEN_CLASS, CLASS_CLASS_NAME },
{ TOKEN_PROPERTY, PROPERTY_CLASS_NAME },
{ TOKEN_SYNTAX, SYNTAX_CLASS_NAME },
};
// 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> <IISObject>
//
//
// 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)
//
//----------------------------------------------------------------------------
HRESULT
ADsObject(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = ProviderName(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
pObjectInfo->ObjectType = TOKEN_IISOBJECT;
pObjectInfo->ComponentArray = NULL;
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 = IISObject(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: IISObject
//
// Synopsis: parses an ADs pathname passed to this provider. This function
// parses the following grammar rules
//
// <IISObject> -> "\\""identifier""\" <IISObject>
//
//
// 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)
//
//----------------------------------------------------------------------------
HRESULT
IISObject(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) && (dwToken != TOKEN_BSLASH)) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if ((dwToken != TOKEN_FSLASH) && (dwToken != TOKEN_BSLASH)) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_IDENTIFIER) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = AddTreeName(pObjectInfo, szToken);
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_BSLASH) && (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);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
HRESULT
PathName(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
HRESULT hr;
WCHAR szToken[MAX_TOKEN_LENGTH];
DWORD dwToken;
do
{
hr = Component(pTokenizer, pObjectInfo);
BAIL_IF_ERROR(hr);
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
}
while( (dwToken == TOKEN_BSLASH) || (dwToken == TOKEN_FSLASH) );
hr = pTokenizer->PushBackToken();
BAIL_IF_ERROR(hr);
cleanup:
RRETURN(hr);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis: Component -> <identifier>
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
HRESULT
Component(CLexer * pTokenizer, POBJECTINFO pObjectInfo)
{
WCHAR szValue[MAX_TOKEN_LENGTH];
WCHAR szComponent[MAX_TOKEN_LENGTH];
DWORD dwToken;
HRESULT hr;
hr = pTokenizer->GetNextToken(szComponent, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken != TOKEN_IDENTIFIER) {
RRETURN(E_ADS_BAD_PATHNAME);
}
hr = AddComponent(pObjectInfo, szComponent, NULL);
BAIL_IF_ERROR(hr);
cleanup:
RRETURN(hr);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
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);
}
/*++
This routine assumes that szToken is a buffer of at least MAX_TOKEN_LENGTH
--*/
HRESULT
CLexer::GetNextToken(LPWSTR szToken, LPDWORD pdwToken)
{
WCHAR c;
DWORD state = 0;
LPWSTR pch = szToken;
memset(szToken, 0, sizeof(WCHAR) * MAX_TOKEN_LENGTH);
_dwLastTokenLength = 0;
while (1) {
c = NextChar();
switch (state) {
case 0:
if (_dwLastTokenLength++ >= MAX_TOKEN_LENGTH) {
RRETURN(RETURNCODETOHRESULT(ERROR_INVALID_NAME));
}
*pch++ = c;
if (c == L'\\') {
*pdwToken = TOKEN_BSLASH;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}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_COLON;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}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 (c == L'\\' || c == L'\0' || c == L',' ||
c == L'=' ||
c == L':' || c == L'/') {
PushbackChar();
*pdwToken = TOKEN_IDENTIFIER;
_dwLastToken = *pdwToken;
RRETURN (S_OK);
}else if (c == L'@' || c == L'!') {
if (!_bAtDisabled) {
PushbackChar();
*pdwToken = TOKEN_IDENTIFIER;
_dwLastToken = *pdwToken;
RRETURN(S_OK);
}else {
if (_dwLastTokenLength++ >= MAX_TOKEN_LENGTH) {
RRETURN(RETURNCODETOHRESULT(ERROR_INVALID_NAME));
}
*pch++ = c;
state = 1;
break;
}
}else {
if (_dwLastTokenLength++ >= MAX_TOKEN_LENGTH) {
RRETURN(RETURNCODETOHRESULT(ERROR_INVALID_NAME));
}
*pch++ = c;
state = 1;
break;
}
default:
RRETURN(RETURNCODETOHRESULT(ERROR_INVALID_NAME));
}
}
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
WCHAR
CLexer::NextChar()
{
if (_ptr == NULL || *_ptr == L'\0') {
_dwEndofString = TRUE;
return(L'\0');
}
return(*_ptr++);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
HRESULT
CLexer::PushBackToken()
{
if (_dwLastToken == TOKEN_END) {
RRETURN(S_OK);
}
_ptr -= _dwLastTokenLength;
RRETURN(S_OK);
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
void
CLexer::PushbackChar()
{
if (_dwEndofString) {
return;
}
_ptr--;
}
//+---------------------------------------------------------------------------
// Function:
//
// Synopsis:
//
// Arguments:
//
// Returns:
//
// Modifies:
//
//----------------------------------------------------------------------------
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)
{
if (!szComponent || !*szComponent) {
RRETURN(E_FAIL);
}
if (pObjectInfo->ComponentArray == NULL) {
pObjectInfo->ComponentArray =
(PCOMPONENT) AllocADsMem(sizeof(COMPONENT)*MAXCOMPONENTS);
pObjectInfo->MaxComponents = MAXCOMPONENTS;
}
else if (pObjectInfo->NumComponents == pObjectInfo->MaxComponents) {
pObjectInfo->ComponentArray =
(PCOMPONENT) ReallocADsMem(
pObjectInfo->ComponentArray,
sizeof(COMPONENT)*pObjectInfo->MaxComponents,
sizeof(COMPONENT)*(
pObjectInfo->MaxComponents+MAXCOMPONENTS)
);
pObjectInfo->MaxComponents += MAXCOMPONENTS;
}
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szComponent =
AllocADsStr(szComponent);
if (szValue && *szValue) {
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szValue =
AllocADsStr(szValue);
}
else {
pObjectInfo->ComponentArray[pObjectInfo->NumComponents].szValue = NULL;
}
pObjectInfo->NumComponents++;
RRETURN(S_OK);
}
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)
{
if (!szToken || !*szToken) {
RRETURN(E_FAIL);
}
pObjectInfo->TreeName = AllocADsStr(szToken);
RRETURN(S_OK);
}
HRESULT
AddClassName(POBJECTINFO pObjectInfo, LPWSTR szToken)
{
if (!szToken || !*szToken) {
RRETURN(E_FAIL);
}
wcscpy(pObjectInfo->ClassName, szToken);
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);
}
//+---------------------------------------------------------------------------
// 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;
hr = pTokenizer->GetNextToken(szToken, &dwToken);
BAIL_IF_ERROR(hr);
if (dwToken == TOKEN_IDENTIFIER ) {
if (pTokenizer->IsKeyword(szToken, &dwToken)) {
hr = SetType(pObjectInfo, dwToken);
RRETURN(hr);
}
hr = AddClassName(pObjectInfo, szToken);
RRETURN(hr);
}
RRETURN(E_FAIL);
cleanup:
RRETURN(hr);
}
void
CLexer::SetAtDisabler(
BOOL bFlag
)
{
_bAtDisabled = bFlag;
}
BOOL
CLexer::GetAtDisabler()
{
return(_bAtDisabled);
}