ntoskrnl/io/symlink.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            ntoskrnl/io/symlink.c
   6  * PURPOSE:         Implements symbolic links
   7  * PROGRAMMER:      David Welch (welch@mcmail.com)
   8  * UPDATE HISTORY:
   9  *                  Created 22/05/98
  10  */
  11
  12 /* INCLUDES *****************************************************************/
  13
  14 #include <ddk/ntddk.h>
  15 #include <internal/se.h>
  16
  17 #define NDEBUG
  18 #include <internal/debug.h>
  19
  20
  21 /* FUNCTIONS ****************************************************************/
  22
  23 /**********************************************************************
  24  * NAME                                                 EXPORTED
  25  *      IoCreateSymbolicLink
  26  *
  27  * DESCRIPTION
  28  *
  29  * ARGUMENTS
  30  *
  31  * RETURN VALUE
  32  *
  33  * REVISIONS
  34  *
  35  */
  36 NTSTATUS STDCALL
  37 IoCreateSymbolicLink(PUNICODE_STRING SymbolicLinkName,
  38                      PUNICODE_STRING DeviceName)
  39 {
  40   OBJECT_ATTRIBUTES ObjectAttributes;
  41   HANDLE Handle;
  42   NTSTATUS Status;
  43
  44   assert_irql(PASSIVE_LEVEL);
  45
  46   DPRINT("IoCreateSymbolicLink(SymbolicLinkName %wZ, DeviceName %wZ)\n",
  47          SymbolicLinkName,
  48          DeviceName);
  49
  50   InitializeObjectAttributes(&ObjectAttributes,
  51                              SymbolicLinkName,
  52                              OBJ_PERMANENT,
  53                              NULL,
  54                              SePublicDefaultSd);
  55
  56   Status = NtCreateSymbolicLinkObject(&Handle,
  57                                       SYMBOLIC_LINK_ALL_ACCESS,
  58                                       &ObjectAttributes,
  59                                       DeviceName);
  60   if (!NT_SUCCESS(Status))
  61     {
  62       DPRINT1("NtCreateSymbolicLinkObject() failed (Status %lx)\n", Status);
  63       return(Status);
  64     }
  65
  66   NtClose(Handle);
  67
  68   return(STATUS_SUCCESS);
  69 }
  70
  71
  72 /**********************************************************************
  73  * NAME                                                 EXPORTED
  74  *      IoCreateUnprotectedSymbolicLink
  75  *
  76  * DESCRIPTION
  77  *
  78  * ARGUMENTS
  79  *
  80  * RETURN VALUE
  81  *
  82  * REVISIONS
  83  *
  84  */
  85 NTSTATUS STDCALL
  86 IoCreateUnprotectedSymbolicLink(PUNICODE_STRING SymbolicLinkName,
  87                                 PUNICODE_STRING DeviceName)
  88 {
  89   SECURITY_DESCRIPTOR SecurityDescriptor;
  90   OBJECT_ATTRIBUTES ObjectAttributes;
  91   HANDLE Handle;
  92   NTSTATUS Status;
  93
  94   assert_irql(PASSIVE_LEVEL);
  95
  96   DPRINT("IoCreateUnprotectedSymbolicLink(SymbolicLinkName %wZ, DeviceName %wZ)\n",
  97          SymbolicLinkName,
  98          DeviceName);
  99
 100   Status = RtlCreateSecurityDescriptor(&SecurityDescriptor,
 101                                        SECURITY_DESCRIPTOR_REVISION);
 102   if (!NT_SUCCESS(Status))
 103     {
 104       DPRINT1("RtlCreateSecurityDescriptor() failed (Status %lx)\n", Status);
 105       return(Status);
 106     }
 107
 108   Status = RtlSetDaclSecurityDescriptor(&SecurityDescriptor,
 109                                         TRUE,
 110                                         NULL,
 111                                         TRUE);
 112   if (!NT_SUCCESS(Status))
 113     {
 114       DPRINT1("RtlSetDaclSecurityDescriptor() failed (Status %lx)\n", Status);
 115       return(Status);
 116     }
 117
 118   InitializeObjectAttributes(&ObjectAttributes,
 119                              SymbolicLinkName,
 120                              OBJ_PERMANENT,
 121                              NULL,
 122                              &SecurityDescriptor);
 123
 124   Status = NtCreateSymbolicLinkObject(&Handle,
 125                                       SYMBOLIC_LINK_ALL_ACCESS,
 126                                       &ObjectAttributes,
 127                                       DeviceName);
 128   if (!NT_SUCCESS(Status))
 129     {
 130       DPRINT1("NtCreateSymbolicLinkObject() failed (Status %lx)\n", Status);
 131       return(Status);
 132     }
 133
 134   NtClose(Handle);
 135
 136   return(STATUS_SUCCESS);
 137 }
 138
 139
 140 /**********************************************************************
 141  * NAME                                                 EXPORTED
 142  *      IoDeleteSymbolicLink
 143  *
 144  * DESCRIPTION
 145  *
 146  * ARGUMENTS
 147  *
 148  * RETURN VALUE
 149  *
 150  * REVISIONS
 151  *
 152  */
 153 NTSTATUS STDCALL
 154 IoDeleteSymbolicLink(PUNICODE_STRING SymbolicLinkName)
 155 {
 156   OBJECT_ATTRIBUTES ObjectAttributes;
 157   HANDLE Handle;
 158   NTSTATUS Status;
 159
 160   assert_irql(PASSIVE_LEVEL);
 161
 162   DPRINT("IoDeleteSymbolicLink (SymbolicLinkName %S)\n",
 163          SymbolicLinkName->Buffer);
 164
 165   InitializeObjectAttributes(&ObjectAttributes,
 166                              SymbolicLinkName,
 167                              OBJ_OPENLINK,
 168                              NULL,
 169                              NULL);
 170
 171   Status = NtOpenSymbolicLinkObject(&Handle,
 172                                     SYMBOLIC_LINK_ALL_ACCESS,
 173                                     &ObjectAttributes);
 174   if (!NT_SUCCESS(Status))
 175     return(Status);
 176
 177   Status = NtMakeTemporaryObject(Handle);
 178   NtClose(Handle);
 179
 180   return(Status);
 181 }
 182
 183 /* EOF */