2 * reactos support for object handling for reactos of libcaptive
3 * Copyright (C) 2002 Jan Kratochvil <project-captive@jankratochvil.net>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; exactly version 2 of June 1991 is required
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "reactos/ddk/obfuncs.h" /* self */
23 #include <glib/gmessages.h>
24 #include "reactos/ddk/status.h"
25 #include "reactos/ddk/exfuncs.h" /* for ExFreePool() */
26 #include "captive/unicode.h" /* for captive_validate_UnicodeString() */
29 /* reactos/ntoskrnl/ob/object.c: */
30 extern POBJECT_HEADER BODY_TO_HEADER(PVOID body);
32 /* reactos/ntoskrnl/ob/ntobj.c: */
33 NTSTATUS internalNameBuilder(POBJECT_HEADER ObjectHeader,PUNICODE_STRING string);
38 * @Object: Object to identify the name from.
39 * %NULL value is forbidden.
40 * @ObjectNameInfo: Target structure to be filled with the @Object name.
41 * %NULL value is permitted.
42 * @Length: Length of @ObjectNameInfo allocated memory block.
43 * sizeof(*@ObjectNameInfo) is required by libcaptive.
44 * @ReturnLength: Returns the length of the unicode name string including the final 0-terminator in bytes.
45 * %NULL value is forbidden.
47 * Function detects the name of a given object @Object. The returned name
48 * string will start with backslash (absolute pathname) and it will be zero terminated.
50 * You can detect the name string length by passing %NULL for @ObjectNameInfo
51 * and %0 for @Length together. The requested string length will be returned by @ReturnLength.
52 * In such case the function return code will be %STATUS_INFO_LENGTH_MISMATCH.
54 * Returns: The unicode string name of @Object. Return code is %STATUS_SUCCESS.
55 * The only valid return code in the case of passed %NULL @ObjectNameInfo is %STATUS_INFO_LENGTH_MISMATCH.
57 NTSTATUS ObQueryNameString(IN PVOID Object,OUT POBJECT_NAME_INFORMATION ObjectNameInfo,IN ULONG Length,OUT PULONG ReturnLength)
59 OBJECT_HEADER *ObjectHeader;
61 UNICODE_STRING UnicodeString;
63 g_return_val_if_fail(Object!=NULL,STATUS_INVALID_PARAMETER);
64 /* 'ObjectNameInfo' may be NULL */
65 g_return_val_if_fail(ReturnLength!=NULL,STATUS_INVALID_PARAMETER);
68 g_return_val_if_fail(Length!=sizeof(*ObjectNameInfo),STATUS_INFO_LENGTH_MISMATCH);
69 g_assert(sizeof(*ObjectNameInfo)==sizeof(UnicodeString)/* ==ObjectNameInfo->Name */);
72 g_return_val_if_fail(Length==0,STATUS_INFO_LENGTH_MISMATCH);
74 ObjectHeader=BODY_TO_HEADER(Object);
76 UnicodeString.Buffer=NULL;
77 UnicodeString.MaximumLength=0;
80 if (UnicodeString.Buffer)
81 ExFreePool(UnicodeString.Buffer);
82 UnicodeString.MaximumLength=MAX(0x100,UnicodeString.MaximumLength*2);
83 UnicodeString.Buffer=ExAllocatePool(PagedPool,UnicodeString.MaximumLength);
84 g_return_val_if_fail(UnicodeString.Buffer!=NULL,STATUS_NO_MEMORY);
86 UnicodeString.Length=0;
87 r=internalNameBuilder(ObjectHeader,&UnicodeString);
88 } while (r==STATUS_BUFFER_TOO_SMALL);
91 ExFreePool(UnicodeString.Buffer);
94 g_assert(captive_validate_UnicodeString(&UnicodeString)); /* ensure 0-termination */
95 *ReturnLength=UnicodeString.Length+sizeof(*UnicodeString.Buffer);
97 if (!ObjectNameInfo) {
98 ExFreePool(UnicodeString.Buffer);
99 /* Valid detection of the object name string length */
100 return STATUS_INFO_LENGTH_MISMATCH;
103 ObjectNameInfo->Name=UnicodeString;
104 return STATUS_SUCCESS;