reactos/ntoskrnl/io/symlink.c

   1 /* $Id: symlink.c,v 1.33 2003/07/10 15:47:00 royce Exp $
   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  * @implemented
  36  */
  37 NTSTATUS STDCALL
  38 IoCreateSymbolicLink(PUNICODE_STRING SymbolicLinkName,
  39                      PUNICODE_STRING DeviceName)
  40 {
  41   OBJECT_ATTRIBUTES ObjectAttributes;
  42   HANDLE Handle;
  43   NTSTATUS Status;
  44
  45   assert_irql(PASSIVE_LEVEL);
  46
  47   DPRINT("IoCreateSymbolicLink(SymbolicLinkName %wZ, DeviceName %wZ)\n",
  48          SymbolicLinkName,
  49          DeviceName);
  50
  51   InitializeObjectAttributes(&ObjectAttributes,
  52                              SymbolicLinkName,
  53                              OBJ_PERMANENT,
  54                              NULL,
  55                              SePublicDefaultSd);
  56
  57   Status = NtCreateSymbolicLinkObject(&Handle,
  58                                       SYMBOLIC_LINK_ALL_ACCESS,
  59                                       &ObjectAttributes,
  60                                       DeviceName);
  61   if (!NT_SUCCESS(Status))
  62     {
  63       DPRINT1("NtCreateSymbolicLinkObject() failed (Status %lx)\n", Status);
  64       return(Status);
  65     }
  66
  67   NtClose(Handle);
  68
  69   return(STATUS_SUCCESS);
  70 }
  71
  72
  73 /**********************************************************************
  74  * NAME                                                 EXPORTED
  75  *      IoCreateUnprotectedSymbolicLink
  76  *
  77  * DESCRIPTION
  78  *
  79  * ARGUMENTS
  80  *
  81  * RETURN VALUE
  82  *
  83  * REVISIONS
  84  *
  85  * @implemented
  86  */
  87 NTSTATUS STDCALL
  88 IoCreateUnprotectedSymbolicLink(PUNICODE_STRING SymbolicLinkName,
  89                                 PUNICODE_STRING DeviceName)
  90 {
  91   SECURITY_DESCRIPTOR SecurityDescriptor;
  92   OBJECT_ATTRIBUTES ObjectAttributes;
  93   HANDLE Handle;
  94   NTSTATUS Status;
  95
  96   assert_irql(PASSIVE_LEVEL);
  97
  98   DPRINT("IoCreateUnprotectedSymbolicLink(SymbolicLinkName %wZ, DeviceName %wZ)\n",
  99          SymbolicLinkName,
 100          DeviceName);
 101
 102   Status = RtlCreateSecurityDescriptor(&SecurityDescriptor,
 103                                        SECURITY_DESCRIPTOR_REVISION);
 104   if (!NT_SUCCESS(Status))
 105     {
 106       DPRINT1("RtlCreateSecurityDescriptor() failed (Status %lx)\n", Status);
 107       return(Status);
 108     }
 109
 110   Status = RtlSetDaclSecurityDescriptor(&SecurityDescriptor,
 111                                         TRUE,
 112                                         NULL,
 113                                         TRUE);
 114   if (!NT_SUCCESS(Status))
 115     {
 116       DPRINT1("RtlSetDaclSecurityDescriptor() failed (Status %lx)\n", Status);
 117       return(Status);
 118     }
 119
 120   InitializeObjectAttributes(&ObjectAttributes,
 121                              SymbolicLinkName,
 122                              OBJ_PERMANENT,
 123                              NULL,
 124                              &SecurityDescriptor);
 125
 126   Status = NtCreateSymbolicLinkObject(&Handle,
 127                                       SYMBOLIC_LINK_ALL_ACCESS,
 128                                       &ObjectAttributes,
 129                                       DeviceName);
 130   if (!NT_SUCCESS(Status))
 131     {
 132       DPRINT1("NtCreateSymbolicLinkObject() failed (Status %lx)\n", Status);
 133       return(Status);
 134     }
 135
 136   NtClose(Handle);
 137
 138   return(STATUS_SUCCESS);
 139 }
 140
 141
 142 /**********************************************************************
 143  * NAME                                                 EXPORTED
 144  *      IoDeleteSymbolicLink
 145  *
 146  * DESCRIPTION
 147  *
 148  * ARGUMENTS
 149  *
 150  * RETURN VALUE
 151  *
 152  * REVISIONS
 153  *
 154  * @implemented
 155  */
 156 NTSTATUS STDCALL
 157 IoDeleteSymbolicLink(PUNICODE_STRING SymbolicLinkName)
 158 {
 159   OBJECT_ATTRIBUTES ObjectAttributes;
 160   HANDLE Handle;
 161   NTSTATUS Status;
 162
 163   assert_irql(PASSIVE_LEVEL);
 164
 165   DPRINT("IoDeleteSymbolicLink (SymbolicLinkName %S)\n",
 166          SymbolicLinkName->Buffer);
 167
 168   InitializeObjectAttributes(&ObjectAttributes,
 169                              SymbolicLinkName,
 170                              OBJ_OPENLINK,
 171                              NULL,
 172                              NULL);
 173
 174   Status = NtOpenSymbolicLinkObject(&Handle,
 175                                     SYMBOLIC_LINK_ALL_ACCESS,
 176                                     &ObjectAttributes);
 177   if (!NT_SUCCESS(Status))
 178     return(Status);
 179
 180   Status = NtMakeTemporaryObject(Handle);
 181   NtClose(Handle);
 182
 183   return(Status);
 184 }
 185
 186 /* EOF */