mirror of
git://source.winehq.org/git/wine.git
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649 lines
21 KiB
C
649 lines
21 KiB
C
/*
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* Object management functions
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*
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* Copyright 1999, 2000 Juergen Schmied
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* Copyright 2005 Vitaliy Margolen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "config.h"
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_IO_H
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# include <io.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include "ntstatus.h"
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#define WIN32_NO_STATUS
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#include "wine/debug.h"
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#include "windef.h"
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#include "winternl.h"
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#include "ntdll_misc.h"
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#include "wine/server.h"
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WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
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/*
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* Generic object functions
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*/
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/******************************************************************************
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* NtQueryObject [NTDLL.@]
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* ZwQueryObject [NTDLL.@]
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*/
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NTSTATUS WINAPI NtQueryObject(IN HANDLE handle,
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IN OBJECT_INFORMATION_CLASS info_class,
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OUT PVOID ptr, IN ULONG len, OUT PULONG used_len)
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{
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NTSTATUS status;
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TRACE("(%p,0x%08x,%p,0x%08x,%p): stub\n",
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handle, info_class, ptr, len, used_len);
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if (used_len) *used_len = 0;
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switch (info_class)
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{
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case ObjectBasicInformation:
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{
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POBJECT_BASIC_INFORMATION p = (POBJECT_BASIC_INFORMATION)ptr;
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if (len < sizeof(*p)) return STATUS_INVALID_BUFFER_SIZE;
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SERVER_START_REQ( get_object_info )
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{
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req->handle = handle;
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status = wine_server_call( req );
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if (status == STATUS_SUCCESS)
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{
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memset( p, 0, sizeof(*p) );
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p->GrantedAccess = reply->access;
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p->PointerCount = reply->ref_count;
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p->HandleCount = 1; /* at least one */
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if (used_len) *used_len = sizeof(*p);
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}
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}
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SERVER_END_REQ;
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}
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break;
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case ObjectDataInformation:
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{
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OBJECT_DATA_INFORMATION* p = (OBJECT_DATA_INFORMATION*)ptr;
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if (len < sizeof(*p)) return STATUS_INVALID_BUFFER_SIZE;
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SERVER_START_REQ( set_handle_info )
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{
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req->handle = handle;
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req->flags = 0;
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req->mask = 0;
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status = wine_server_call( req );
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if (status == STATUS_SUCCESS)
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{
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p->InheritHandle = (reply->old_flags & HANDLE_FLAG_INHERIT) ? TRUE : FALSE;
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p->ProtectFromClose = (reply->old_flags & HANDLE_FLAG_PROTECT_FROM_CLOSE) ? TRUE : FALSE;
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if (used_len) *used_len = sizeof(*p);
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}
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}
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SERVER_END_REQ;
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}
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break;
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default:
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FIXME("Unsupported information class %u\n", info_class);
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status = STATUS_NOT_IMPLEMENTED;
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break;
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}
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return status;
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}
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/******************************************************************
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* NtSetInformationObject [NTDLL.@]
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* ZwSetInformationObject [NTDLL.@]
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*
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*/
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NTSTATUS WINAPI NtSetInformationObject(IN HANDLE handle,
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IN OBJECT_INFORMATION_CLASS info_class,
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IN PVOID ptr, IN ULONG len)
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{
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NTSTATUS status;
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TRACE("(%p,0x%08x,%p,0x%08x): stub\n",
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handle, info_class, ptr, len);
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switch (info_class)
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{
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case ObjectDataInformation:
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{
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OBJECT_DATA_INFORMATION* p = (OBJECT_DATA_INFORMATION*)ptr;
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if (len < sizeof(*p)) return STATUS_INVALID_BUFFER_SIZE;
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SERVER_START_REQ( set_handle_info )
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{
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req->handle = handle;
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req->flags = 0;
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req->mask = HANDLE_FLAG_INHERIT | HANDLE_FLAG_PROTECT_FROM_CLOSE;
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if (p->InheritHandle) req->flags |= HANDLE_FLAG_INHERIT;
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if (p->ProtectFromClose) req->flags |= HANDLE_FLAG_PROTECT_FROM_CLOSE;
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status = wine_server_call( req );
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}
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SERVER_END_REQ;
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}
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break;
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default:
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FIXME("Unsupported information class %u\n", info_class);
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status = STATUS_NOT_IMPLEMENTED;
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break;
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}
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return status;
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}
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/******************************************************************************
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* NtQuerySecurityObject [NTDLL.@]
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*
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* An ntdll analogue to GetKernelObjectSecurity().
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*
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* NOTES
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* only the lowest 4 bit of SecurityObjectInformationClass are used
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* 0x7-0xf returns STATUS_ACCESS_DENIED (even running with system privileges)
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*
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* FIXME
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* We are constructing a fake sid (Administrators:Full, System:Full, Everyone:Read)
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*/
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NTSTATUS WINAPI
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NtQuerySecurityObject(
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IN HANDLE Object,
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IN SECURITY_INFORMATION RequestedInformation,
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OUT PSECURITY_DESCRIPTOR pSecurityDesriptor,
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IN ULONG Length,
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OUT PULONG ResultLength)
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{
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static const SID_IDENTIFIER_AUTHORITY localSidAuthority = {SECURITY_NT_AUTHORITY};
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static const SID_IDENTIFIER_AUTHORITY worldSidAuthority = {SECURITY_WORLD_SID_AUTHORITY};
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BYTE Buffer[256];
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PISECURITY_DESCRIPTOR_RELATIVE psd = (PISECURITY_DESCRIPTOR_RELATIVE)Buffer;
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UINT BufferIndex = sizeof(SECURITY_DESCRIPTOR_RELATIVE);
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FIXME("(%p,0x%08x,%p,0x%08x,%p) stub!\n",
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Object, RequestedInformation, pSecurityDesriptor, Length, ResultLength);
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RequestedInformation &= 0x0000000f;
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ZeroMemory(Buffer, 256);
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RtlCreateSecurityDescriptor((PSECURITY_DESCRIPTOR)psd, SECURITY_DESCRIPTOR_REVISION);
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psd->Control = SE_SELF_RELATIVE |
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((RequestedInformation & DACL_SECURITY_INFORMATION) ? SE_DACL_PRESENT:0);
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/* owner: administrator S-1-5-20-220*/
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if (OWNER_SECURITY_INFORMATION & RequestedInformation)
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{
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SID* psid = (SID*)&(Buffer[BufferIndex]);
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psd->Owner = BufferIndex;
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BufferIndex += RtlLengthRequiredSid(2);
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psid->Revision = SID_REVISION;
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psid->SubAuthorityCount = 2;
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psid->IdentifierAuthority = localSidAuthority;
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psid->SubAuthority[0] = SECURITY_BUILTIN_DOMAIN_RID;
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psid->SubAuthority[1] = DOMAIN_ALIAS_RID_ADMINS;
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}
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/* group: built in domain S-1-5-12 */
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if (GROUP_SECURITY_INFORMATION & RequestedInformation)
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{
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SID* psid = (SID*) &(Buffer[BufferIndex]);
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psd->Group = BufferIndex;
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BufferIndex += RtlLengthRequiredSid(1);
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psid->Revision = SID_REVISION;
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psid->SubAuthorityCount = 1;
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psid->IdentifierAuthority = localSidAuthority;
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psid->SubAuthority[0] = SECURITY_LOCAL_SYSTEM_RID;
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}
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/* discretionary ACL */
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if (DACL_SECURITY_INFORMATION & RequestedInformation)
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{
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/* acl header */
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PACL pacl = (PACL)&(Buffer[BufferIndex]);
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PACCESS_ALLOWED_ACE pace;
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SID* psid;
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psd->Dacl = BufferIndex;
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pacl->AclRevision = MIN_ACL_REVISION;
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pacl->AceCount = 3;
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pacl->AclSize = BufferIndex; /* storing the start index temporary */
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BufferIndex += sizeof(ACL);
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/* ACE System - full access */
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pace = (PACCESS_ALLOWED_ACE)&(Buffer[BufferIndex]);
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BufferIndex += sizeof(ACCESS_ALLOWED_ACE)-sizeof(DWORD);
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pace->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
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pace->Header.AceFlags = CONTAINER_INHERIT_ACE;
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pace->Header.AceSize = sizeof(ACCESS_ALLOWED_ACE)-sizeof(DWORD) + RtlLengthRequiredSid(1);
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pace->Mask = STANDARD_RIGHTS_ALL | SPECIFIC_RIGHTS_ALL;
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pace->SidStart = BufferIndex;
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/* SID S-1-5-12 (System) */
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psid = (SID*)&(Buffer[BufferIndex]);
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BufferIndex += RtlLengthRequiredSid(1);
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psid->Revision = SID_REVISION;
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psid->SubAuthorityCount = 1;
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psid->IdentifierAuthority = localSidAuthority;
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psid->SubAuthority[0] = SECURITY_LOCAL_SYSTEM_RID;
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/* ACE Administrators - full access*/
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pace = (PACCESS_ALLOWED_ACE) &(Buffer[BufferIndex]);
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BufferIndex += sizeof(ACCESS_ALLOWED_ACE)-sizeof(DWORD);
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pace->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
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pace->Header.AceFlags = CONTAINER_INHERIT_ACE;
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pace->Header.AceSize = sizeof(ACCESS_ALLOWED_ACE)-sizeof(DWORD) + RtlLengthRequiredSid(2);
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pace->Mask = STANDARD_RIGHTS_ALL | SPECIFIC_RIGHTS_ALL;
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pace->SidStart = BufferIndex;
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/* S-1-5-12 (Administrators) */
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psid = (SID*)&(Buffer[BufferIndex]);
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BufferIndex += RtlLengthRequiredSid(2);
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psid->Revision = SID_REVISION;
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psid->SubAuthorityCount = 2;
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psid->IdentifierAuthority = localSidAuthority;
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psid->SubAuthority[0] = SECURITY_BUILTIN_DOMAIN_RID;
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psid->SubAuthority[1] = DOMAIN_ALIAS_RID_ADMINS;
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/* ACE Everyone - read access */
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pace = (PACCESS_ALLOWED_ACE)&(Buffer[BufferIndex]);
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BufferIndex += sizeof(ACCESS_ALLOWED_ACE)-sizeof(DWORD);
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pace->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
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pace->Header.AceFlags = CONTAINER_INHERIT_ACE;
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pace->Header.AceSize = sizeof(ACCESS_ALLOWED_ACE)-sizeof(DWORD) + RtlLengthRequiredSid(1);
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pace->Mask = READ_CONTROL| 0x19;
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pace->SidStart = BufferIndex;
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/* SID S-1-1-0 (Everyone) */
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psid = (SID*)&(Buffer[BufferIndex]);
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BufferIndex += RtlLengthRequiredSid(1);
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psid->Revision = SID_REVISION;
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psid->SubAuthorityCount = 1;
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psid->IdentifierAuthority = worldSidAuthority;
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psid->SubAuthority[0] = 0;
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/* calculate used bytes */
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pacl->AclSize = BufferIndex - pacl->AclSize;
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}
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*ResultLength = BufferIndex;
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TRACE("len=%u\n", *ResultLength);
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if (Length < *ResultLength) return STATUS_BUFFER_TOO_SMALL;
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memcpy(pSecurityDesriptor, Buffer, *ResultLength);
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return STATUS_SUCCESS;
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}
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/******************************************************************************
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* NtDuplicateObject [NTDLL.@]
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* ZwDuplicateObject [NTDLL.@]
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*/
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NTSTATUS WINAPI NtDuplicateObject( HANDLE source_process, HANDLE source,
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HANDLE dest_process, PHANDLE dest,
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ACCESS_MASK access, ULONG attributes, ULONG options )
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{
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NTSTATUS ret;
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SERVER_START_REQ( dup_handle )
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{
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req->src_process = source_process;
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req->src_handle = source;
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req->dst_process = dest_process;
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req->access = access;
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req->attributes = attributes;
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req->options = options;
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if (!(ret = wine_server_call( req )))
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{
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if (dest) *dest = reply->handle;
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if (reply->closed)
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{
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if (reply->self)
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{
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int fd = server_remove_fd_from_cache( source );
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if (fd != -1) close( fd );
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}
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}
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else if (options & DUPLICATE_CLOSE_SOURCE)
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WARN( "failed to close handle %p in process %p\n", source, source_process );
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}
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}
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SERVER_END_REQ;
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return ret;
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}
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/**************************************************************************
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* NtClose [NTDLL.@]
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*
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* Close a handle reference to an object.
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*
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* PARAMS
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* Handle [I] handle to close
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*
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* RETURNS
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* Success: ERROR_SUCCESS.
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* Failure: An NTSTATUS error code.
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*/
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NTSTATUS WINAPI NtClose( HANDLE Handle )
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{
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NTSTATUS ret;
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int fd = server_remove_fd_from_cache( Handle );
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SERVER_START_REQ( close_handle )
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{
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req->handle = Handle;
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ret = wine_server_call( req );
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}
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SERVER_END_REQ;
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if (fd != -1) close( fd );
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return ret;
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}
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/*
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* Directory functions
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*/
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/**************************************************************************
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* NtOpenDirectoryObject [NTDLL.@]
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* ZwOpenDirectoryObject [NTDLL.@]
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*
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* Open a namespace directory object.
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*
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* PARAMS
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* DirectoryHandle [O] Destination for the new directory handle
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* DesiredAccess [I] Desired access to the directory
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* ObjectAttributes [I] Structure describing the directory
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*
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* RETURNS
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* Success: ERROR_SUCCESS.
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* Failure: An NTSTATUS error code.
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*/
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NTSTATUS WINAPI NtOpenDirectoryObject(PHANDLE DirectoryHandle, ACCESS_MASK DesiredAccess,
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POBJECT_ATTRIBUTES ObjectAttributes)
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{
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NTSTATUS ret;
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TRACE("(%p,0x%08x)\n", DirectoryHandle, DesiredAccess);
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dump_ObjectAttributes(ObjectAttributes);
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if (!DirectoryHandle) return STATUS_ACCESS_VIOLATION;
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if (!ObjectAttributes) return STATUS_INVALID_PARAMETER;
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/* Have to test it here because server won't know difference between
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* ObjectName == NULL and ObjectName == "" */
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if (!ObjectAttributes->ObjectName)
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{
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if (ObjectAttributes->RootDirectory)
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return STATUS_OBJECT_NAME_INVALID;
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else
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return STATUS_OBJECT_PATH_SYNTAX_BAD;
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}
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SERVER_START_REQ(open_directory)
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{
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req->access = DesiredAccess;
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req->attributes = ObjectAttributes->Attributes;
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req->rootdir = ObjectAttributes->RootDirectory;
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if (ObjectAttributes->ObjectName)
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wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
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ObjectAttributes->ObjectName->Length);
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ret = wine_server_call( req );
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*DirectoryHandle = reply->handle;
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}
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SERVER_END_REQ;
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return ret;
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}
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/******************************************************************************
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* NtCreateDirectoryObject [NTDLL.@]
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* ZwCreateDirectoryObject [NTDLL.@]
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*
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* Create a namespace directory object.
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*
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* PARAMS
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* DirectoryHandle [O] Destination for the new directory handle
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* DesiredAccess [I] Desired access to the directory
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* ObjectAttributes [I] Structure describing the directory
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*
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* RETURNS
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* Success: ERROR_SUCCESS.
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* Failure: An NTSTATUS error code.
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*/
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NTSTATUS WINAPI NtCreateDirectoryObject(PHANDLE DirectoryHandle, ACCESS_MASK DesiredAccess,
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POBJECT_ATTRIBUTES ObjectAttributes)
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{
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NTSTATUS ret;
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TRACE("(%p,0x%08x)\n", DirectoryHandle, DesiredAccess);
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dump_ObjectAttributes(ObjectAttributes);
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if (!DirectoryHandle) return STATUS_ACCESS_VIOLATION;
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SERVER_START_REQ(create_directory)
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{
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req->access = DesiredAccess;
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req->attributes = ObjectAttributes ? ObjectAttributes->Attributes : 0;
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req->rootdir = ObjectAttributes ? ObjectAttributes->RootDirectory : 0;
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if (ObjectAttributes && ObjectAttributes->ObjectName)
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wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
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ObjectAttributes->ObjectName->Length);
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ret = wine_server_call( req );
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*DirectoryHandle = reply->handle;
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}
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SERVER_END_REQ;
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return ret;
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}
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/******************************************************************************
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* NtQueryDirectoryObject [NTDLL.@]
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* ZwQueryDirectoryObject [NTDLL.@]
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*
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* Read information from a namespace directory.
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*
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* PARAMS
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* DirectoryHandle [I] Handle to a directory object
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* Buffer [O] Buffer to hold the read data
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* BufferLength [I] Size of the buffer in bytes
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* ReturnSingleEntry [I] If TRUE, return a single entry, if FALSE, return as many as fit in the buffer
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* RestartScan [I] If TRUE, start scanning from the start, if FALSE, scan from Context
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* Context [I/O] Indicates what point of the directory the scan is at
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* ReturnLength [O] Caller supplied storage for the number of bytes written (or NULL)
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*
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* RETURNS
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* Success: ERROR_SUCCESS.
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* Failure: An NTSTATUS error code.
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*/
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NTSTATUS WINAPI NtQueryDirectoryObject(IN HANDLE DirectoryHandle, OUT PDIRECTORY_BASIC_INFORMATION Buffer,
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IN ULONG BufferLength, IN BOOLEAN ReturnSingleEntry, IN BOOLEAN RestartScan,
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IN OUT PULONG Context, OUT PULONG ReturnLength OPTIONAL)
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{
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FIXME("(%p,%p,0x%08x,0x%08x,0x%08x,%p,%p), stub\n", DirectoryHandle, Buffer, BufferLength, ReturnSingleEntry,
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RestartScan, Context, ReturnLength);
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return STATUS_NOT_IMPLEMENTED;
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}
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/*
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* Link objects
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*/
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/******************************************************************************
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* NtOpenSymbolicLinkObject [NTDLL.@]
|
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* ZwOpenSymbolicLinkObject [NTDLL.@]
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*
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* Open a namespace symbolic link object.
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*
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* PARAMS
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* LinkHandle [O] Destination for the new symbolic link handle
|
|
* DesiredAccess [I] Desired access to the symbolic link
|
|
* ObjectAttributes [I] Structure describing the symbolic link
|
|
*
|
|
* RETURNS
|
|
* Success: ERROR_SUCCESS.
|
|
* Failure: An NTSTATUS error code.
|
|
*/
|
|
NTSTATUS WINAPI NtOpenSymbolicLinkObject(OUT PHANDLE LinkHandle, IN ACCESS_MASK DesiredAccess,
|
|
IN POBJECT_ATTRIBUTES ObjectAttributes)
|
|
{
|
|
NTSTATUS ret;
|
|
TRACE("(%p,0x%08x,%p)\n",LinkHandle, DesiredAccess, ObjectAttributes);
|
|
dump_ObjectAttributes(ObjectAttributes);
|
|
|
|
if (!LinkHandle) return STATUS_ACCESS_VIOLATION;
|
|
if (!ObjectAttributes) return STATUS_INVALID_PARAMETER;
|
|
/* Have to test it here because server won't know difference between
|
|
* ObjectName == NULL and ObjectName == "" */
|
|
if (!ObjectAttributes->ObjectName)
|
|
{
|
|
if (ObjectAttributes->RootDirectory)
|
|
return STATUS_OBJECT_NAME_INVALID;
|
|
else
|
|
return STATUS_OBJECT_PATH_SYNTAX_BAD;
|
|
}
|
|
|
|
SERVER_START_REQ(open_symlink)
|
|
{
|
|
req->access = DesiredAccess;
|
|
req->attributes = ObjectAttributes->Attributes;
|
|
req->rootdir = ObjectAttributes->RootDirectory;
|
|
if (ObjectAttributes->ObjectName)
|
|
wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
|
|
ObjectAttributes->ObjectName->Length);
|
|
ret = wine_server_call( req );
|
|
*LinkHandle = reply->handle;
|
|
}
|
|
SERVER_END_REQ;
|
|
return ret;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* NtCreateSymbolicLinkObject [NTDLL.@]
|
|
* ZwCreateSymbolicLinkObject [NTDLL.@]
|
|
*
|
|
* Open a namespace symbolic link object.
|
|
*
|
|
* PARAMS
|
|
* SymbolicLinkHandle [O] Destination for the new symbolic link handle
|
|
* DesiredAccess [I] Desired access to the symbolic link
|
|
* ObjectAttributes [I] Structure describing the symbolic link
|
|
* TargetName [I] Name of the target symbolic link points to
|
|
*
|
|
* RETURNS
|
|
* Success: ERROR_SUCCESS.
|
|
* Failure: An NTSTATUS error code.
|
|
*/
|
|
NTSTATUS WINAPI NtCreateSymbolicLinkObject(OUT PHANDLE SymbolicLinkHandle,IN ACCESS_MASK DesiredAccess,
|
|
IN POBJECT_ATTRIBUTES ObjectAttributes,
|
|
IN PUNICODE_STRING TargetName)
|
|
{
|
|
NTSTATUS ret;
|
|
TRACE("(%p,0x%08x,%p, -> %s)\n", SymbolicLinkHandle, DesiredAccess, ObjectAttributes,
|
|
debugstr_us(TargetName));
|
|
dump_ObjectAttributes(ObjectAttributes);
|
|
|
|
if (!SymbolicLinkHandle || !TargetName) return STATUS_ACCESS_VIOLATION;
|
|
if (!TargetName->Buffer) return STATUS_INVALID_PARAMETER;
|
|
|
|
SERVER_START_REQ(create_symlink)
|
|
{
|
|
req->access = DesiredAccess;
|
|
req->attributes = ObjectAttributes ? ObjectAttributes->Attributes : 0;
|
|
req->rootdir = ObjectAttributes ? ObjectAttributes->RootDirectory : 0;
|
|
if (ObjectAttributes && ObjectAttributes->ObjectName)
|
|
{
|
|
req->name_len = ObjectAttributes->ObjectName->Length;
|
|
wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
|
|
ObjectAttributes->ObjectName->Length);
|
|
}
|
|
else
|
|
req->name_len = 0;
|
|
wine_server_add_data(req, TargetName->Buffer, TargetName->Length);
|
|
ret = wine_server_call( req );
|
|
*SymbolicLinkHandle = reply->handle;
|
|
}
|
|
SERVER_END_REQ;
|
|
return ret;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* NtQuerySymbolicLinkObject [NTDLL.@]
|
|
* ZwQuerySymbolicLinkObject [NTDLL.@]
|
|
*
|
|
* Query a namespace symbolic link object target name.
|
|
*
|
|
* PARAMS
|
|
* LinkHandle [I] Handle to a symbolic link object
|
|
* LinkTarget [O] Destination for the symbolic link target
|
|
* ReturnedLength [O] Size of returned data
|
|
*
|
|
* RETURNS
|
|
* Success: ERROR_SUCCESS.
|
|
* Failure: An NTSTATUS error code.
|
|
*/
|
|
NTSTATUS WINAPI NtQuerySymbolicLinkObject(IN HANDLE LinkHandle, IN OUT PUNICODE_STRING LinkTarget,
|
|
OUT PULONG ReturnedLength OPTIONAL)
|
|
{
|
|
NTSTATUS ret;
|
|
TRACE("(%p,%p,%p)\n", LinkHandle, LinkTarget, ReturnedLength);
|
|
|
|
if (!LinkTarget) return STATUS_ACCESS_VIOLATION;
|
|
|
|
SERVER_START_REQ(query_symlink)
|
|
{
|
|
req->handle = LinkHandle;
|
|
wine_server_set_reply( req, LinkTarget->Buffer, LinkTarget->MaximumLength );
|
|
if (!(ret = wine_server_call( req )))
|
|
{
|
|
LinkTarget->Length = wine_server_reply_size(reply);
|
|
if (ReturnedLength) *ReturnedLength = LinkTarget->Length;
|
|
}
|
|
}
|
|
SERVER_END_REQ;
|
|
return ret;
|
|
}
|
|
|
|
/******************************************************************************
|
|
* NtAllocateUuids [NTDLL.@]
|
|
*/
|
|
NTSTATUS WINAPI NtAllocateUuids(
|
|
PULARGE_INTEGER Time,
|
|
PULONG Range,
|
|
PULONG Sequence)
|
|
{
|
|
FIXME("(%p,%p,%p), stub.\n", Time, Range, Sequence);
|
|
return 0;
|
|
}
|