Share xattr implementation.

1 files changed, 140 insertions, 0 deletions

diff --git a/librpc/idl/xattr.idl b/librpc/idl/xattr.idl
new file mode 100644
index 00000000000..c1af4791ae7
--- /dev/null
+++ b/librpc/idl/xattr.idl
@@ -0,0 +1,140 @@
+#include "idl_types.h"
+
+/*
+   IDL structures for xattr file attributes
+
+   this has nothing to do with RPC, we are just using our NDR/IDL
+   infrastructure as a convenient way to store linearised information
+   about a file in a architecture independent manner
+*/
+
+import "security.idl";
+
+[
+  pointer_default(unique)
+]
+interface xattr
+{
+	const char *XATTR_DOSATTRIB_NAME = "user.DosAttrib";
+	const int XATTR_DOSATTRIB_ESTIMATED_SIZE = 64;
+
+	/* we store basic dos attributes in a DosAttrib xattr. By
+	   using a union we can cope with new version of this
+	   structure more easily */
+
+	typedef struct {
+		uint32 attrib;
+		uint32 ea_size;
+		udlong size;
+		udlong alloc_size;
+		NTTIME create_time;
+		NTTIME change_time;
+	} xattr_DosInfo1;
+
+/*
+	We use xattrDosInfo1 again when we store values.
+	Because the sticky write time is now stored in the opendb
+	and xattr_DosInfo2Old is only present to parse existing
+	values from disk.
+
+	const int XATTR_ATTRIB_FLAG_STICKY_WRITE_TIME = 0x1;
+*/
+	typedef struct {
+		uint32     flags;
+		uint32     attrib;
+		uint32     ea_size;
+		udlong     size;
+		udlong     alloc_size;
+		NTTIME     create_time;
+		NTTIME     change_time;
+		NTTIME     write_time; /* only used when sticky write time is set */
+		utf8string name;
+	} xattr_DosInfo2Old;
+
+	typedef [switch_type(uint16)] union {
+		[case(1)] xattr_DosInfo1 info1;
+		[case(2)] xattr_DosInfo2Old oldinfo2;
+	} xattr_DosInfo;
+
+	typedef [public] struct {
+		uint16 version;
+		[switch_is(version)] xattr_DosInfo info;
+	} xattr_DosAttrib;
+
+
+	/* we store DOS style extended attributes in a DosEAs xattr */
+	const char *XATTR_DOSEAS_NAME = "user.DosEAs";
+
+	typedef struct {
+		utf8string name;
+		DATA_BLOB value;
+	} xattr_EA;
+
+	typedef [public] struct {
+		uint16 num_eas;
+		[size_is(num_eas)] xattr_EA *eas;
+	} xattr_DosEAs;
+
+	/* Slightly different version, used by the vfs_xattr_tdb module */
+	typedef [public] struct {
+		uint32 num_eas;
+		xattr_EA eas[num_eas];
+	} tdb_xattrs;
+
+	/* we store stream information in this xattr structure. Then
+	   the streams themselves are stored in
+	   user.DosStream.STREAMNAME or in external files, according
+	   to the flags */
+	const char *XATTR_DOSSTREAMS_NAME = "user.DosStreams";
+
+	const int XATTR_STREAM_FLAG_INTERNAL = 0x00000001;
+
+	/* stream data is stored in attributes with the given prefix */
+	const char *XATTR_DOSSTREAM_PREFIX = "user.DosStream.";
+
+	const int XATTR_MAX_STREAM_SIZE     = 0x4000;
+	const int XATTR_MAX_STREAM_SIZE_TDB = 0x100000;
+
+	typedef struct {
+		uint32     flags;
+		udlong     size;
+		udlong     alloc_size;
+		utf8string name;
+	} xattr_DosStream;
+
+	typedef [public] struct {
+		uint32 num_streams;
+		[size_is(num_streams)] xattr_DosStream *streams;
+	} xattr_DosStreams;
+
+
+	/* we store the NT ACL a NTACL xattr. It is versioned so we
+	   can later add other acl attribs (such as posix acl mapping)
+
+	   we put this xattr in the security namespace to ensure that
+	   only trusted users can write to the ACL
+
+	   stored in "security.NTACL"
+
+	   Version 1. raw SD stored as Samba4 does it.
+	   Version 2. raw SD + last changed timestamp so we
+		      can discard if this doesn't match the POSIX st_ctime.
+	*/
+
+	const char *XATTR_NTACL_NAME = "security.NTACL";
+
+	typedef [public] struct {
+		security_descriptor *sd;
+		NTTIME last_changed;
+	} security_descriptor_timestamp;
+
+	typedef [switch_type(uint16)] union {
+		[case(1)] security_descriptor *sd;
+		[case(2)] security_descriptor_timestamp *sd_ts;
+	} xattr_NTACL_Info;
+
+	typedef [public] struct {
+		uint16 version;
+		[switch_is(version)] xattr_NTACL_Info info;
+	} xattr_NTACL;
+}