reactos/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  *
   8  * PROGRAMMERS:     David Welch (welch@mcmail.com)
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ntoskrnl.h>
  14 #define NDEBUG
  15 #include <internal/debug.h>
  16
  17
  18 /* FUNCTIONS ****************************************************************/
  19
  20 /**********************************************************************
  21  * NAME                                                 EXPORTED
  22  *      IoCreateSymbolicLink
  23  *
  24  * DESCRIPTION
  25  *
  26  * ARGUMENTS
  27  *
  28  * RETURN VALUE
  29  *
  30  * REVISIONS
  31  *
  32  * @implemented
  33  */
  34 NTSTATUS STDCALL
  35 IoCreateSymbolicLink(PUNICODE_STRING SymbolicLinkName,
  36                      PUNICODE_STRING DeviceName)
  37 {
  38   OBJECT_ATTRIBUTES ObjectAttributes;
  39   HANDLE Handle;
  40   NTSTATUS Status;
  41
  42   ASSERT_IRQL(PASSIVE_LEVEL);
  43
  44   DPRINT("IoCreateSymbolicLink(SymbolicLinkName %wZ, DeviceName %wZ)\n",
  45          SymbolicLinkName,
  46          DeviceName);
  47
  48   InitializeObjectAttributes(&ObjectAttributes,
  49                              SymbolicLinkName,
  50                              OBJ_PERMANENT,
  51                              NULL,
  52                              SePublicDefaultSd);
  53
  54   Status = ZwCreateSymbolicLinkObject(&Handle,
  55                                       SYMBOLIC_LINK_ALL_ACCESS,
  56                                       &ObjectAttributes,
  57                                       DeviceName);
  58   if (!NT_SUCCESS(Status))
  59     {
  60       DPRINT1("ZwCreateSymbolicLinkObject() failed (Status %lx)\n", Status);
  61       return(Status);
  62     }
  63
  64   ZwClose(Handle);
  65
  66   return(STATUS_SUCCESS);
  67 }
  68
  69
  70 /**********************************************************************
  71  * NAME                                                 EXPORTED
  72  *      IoCreateUnprotectedSymbolicLink
  73  *
  74  * DESCRIPTION
  75  *
  76  * ARGUMENTS
  77  *
  78  * RETURN VALUE
  79  *
  80  * REVISIONS
  81  *
  82  * @implemented
  83  */
  84 NTSTATUS STDCALL
  85 IoCreateUnprotectedSymbolicLink(PUNICODE_STRING SymbolicLinkName,
  86                                 PUNICODE_STRING DeviceName)
  87 {
  88   SECURITY_DESCRIPTOR SecurityDescriptor;
  89   OBJECT_ATTRIBUTES ObjectAttributes;
  90   HANDLE Handle;
  91   NTSTATUS Status;
  92
  93   ASSERT_IRQL(PASSIVE_LEVEL);
  94
  95   DPRINT("IoCreateUnprotectedSymbolicLink(SymbolicLinkName %wZ, DeviceName %wZ)\n",
  96          SymbolicLinkName,
  97          DeviceName);
  98
  99   Status = RtlCreateSecurityDescriptor(&SecurityDescriptor,
 100                                        SECURITY_DESCRIPTOR_REVISION);
 101   if (!NT_SUCCESS(Status))
 102     {
 103       DPRINT1("RtlCreateSecurityDescriptor() failed (Status %lx)\n", Status);
 104       return(Status);
 105     }
 106
 107   Status = RtlSetDaclSecurityDescriptor(&SecurityDescriptor,
 108                                         TRUE,
 109                                         NULL,
 110                                         TRUE);
 111   if (!NT_SUCCESS(Status))
 112     {
 113       DPRINT1("RtlSetDaclSecurityDescriptor() failed (Status %lx)\n", Status);
 114       return(Status);
 115     }
 116
 117   InitializeObjectAttributes(&ObjectAttributes,
 118                              SymbolicLinkName,
 119                              OBJ_PERMANENT,
 120                              NULL,
 121                              &SecurityDescriptor);
 122
 123   Status = ZwCreateSymbolicLinkObject(&Handle,
 124                                       SYMBOLIC_LINK_ALL_ACCESS,
 125                                       &ObjectAttributes,
 126                                       DeviceName);
 127   if (!NT_SUCCESS(Status))
 128     {
 129       DPRINT1("ZwCreateSymbolicLinkObject() failed (Status %lx)\n", Status);
 130       return(Status);
 131     }
 132
 133   ZwClose(Handle);
 134
 135   return(STATUS_SUCCESS);
 136 }
 137
 138
 139 /**********************************************************************
 140  * NAME                                                 EXPORTED
 141  *      IoDeleteSymbolicLink
 142  *
 143  * DESCRIPTION
 144  *
 145  * ARGUMENTS
 146  *
 147  * RETURN VALUE
 148  *
 149  * REVISIONS
 150  *
 151  * @implemented
 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 = ZwOpenSymbolicLinkObject(&Handle,
 172                                     SYMBOLIC_LINK_ALL_ACCESS,
 173                                     &ObjectAttributes);
 174   if (!NT_SUCCESS(Status))
 175     return(Status);
 176
 177   Status = ZwMakeTemporaryObject(Handle);
 178   ZwClose(Handle);
 179
 180   return(Status);
 181 }
 182
 183 /* EOF */