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	29	.Dd October 10, 2011
	30	.Dt MBR_UID_TO_UUID 3
	31	.Os "Mac OS X"
	32	.Sh NAME
	33	.Nm mbr_uid_to_uuid,
	34	.Nm mbr_gid_to_uuid,
	35	.Nm mbr_uuid_to_id,
	36	.Nm mbr_sid_to_uuid,
	37	.Nm mbr_uuid_to_sid
	38	.Nd user and group identifier translation functions
	39	.Sh SYNOPSIS
	40	.In membership.h
	41	.Ft int
	42	.Fn mbr_uid_to_uuid "uid_t id" "uuid_t uu"
	43	.Ft int
	44	.Fn mbr_gid_to_uuid "gid_t id" "uuid_t uu"
	45	.Ft int
	46	.Fn mbr_uuid_to_id "const uuid_t uu" "uid_t id" "int id_type"
	47	.Ft int
	48	.Fn mbr_sid_to_uuid "const nt_sid_t *sid" "uuid_t uu"
	49	.Ft int
	50	.Fn mbr_uuid_to_sid "const uuid_t uu" "nt_sid_t *sid"
	51	.Ft int
	52	.Fn mbr_sid_to_string "const nt_sid_t sid" "char string"
	53	.Ft int
	54	.Fn mbr_string_to_sid "const char string" "nt_sid_t sid"
	55	.Sh DESCRIPTION
	56	Users and groups can be referred to in multiple ways.
	57	In addition to the traditional uid and gid,
	58	every user or group can be referenced by a 128 bit uuid.
	59	Additionally, if the user or group is hosted on a PDC
	60	or Active Directory server, it will have a 128 bit or larger sid.
	61	.Pp
	62	These routines communicate with
	63	.Xr openditectoryd 8 .
	64	.Pp
	65	.Fn mbr_uid_to_uuid
	66	takes a uid and looks up the associated user account.
	67	It provides the the uuid for that user as an output parameter.
	68	Note that this routine will succeed and return a fabricated uuid if the input user uid does not exist.
	69	.Fn getpwuid
	70	should be used to test for the existence of a uid.
	71	.Pp
	72	.Fn mbr_gid_to_uuid
	73	similarly gets the uuid associated with a group.
	74	Note that this routine will succeed and return a fabricated uuid if the input group gid does not exist.
	75	.Fn getgrgid
	76	should be used to test for the existence of a gid.
	77	.Pp
	78	.Fn mbr_uuid_to_id
	79	takes a uuid that refers to a user or group and fetches the corresponding uid or gid.
	80	.Fa id_type
	81	is set to ID_TYPE_UID or ID_TYPE_GID to indicate which type was found.
	82	Note that
	83	.Fn mbr_uuid_to_id
	84	always returns an id even if the uuid is not found.
	85	This returned id is not persistant,
	86	but can be used to map back to the uuid during runtime.
	87	To determine if the uuid exists, the returned id can be used in a call to
	88	.Xr getpwuid 3
	89	or
	90	.Xr getgrgid 3 .
	91	.Pp
	92	.Fn mbr_sid_to_uuid
	93	takes a sid and returns the associated uuid.
	94	.Pp
	95	.Fn mbr_uuid_to_sid
	96	returns a sid for the associated uuid.
	97	.Pp
	98	Two additional utility functions are available to convert between sids and a string representation.
	99	String representations may be required, for example, when text files or XML files are used to save sid values.
	100	.Pp
	101	.Fn mbr_sid_to_string
	102	converts a sid into a string representation.
	103	The
	104	.Fa string
	105	parameter must be a buffer of at least 194 characters.
	106	The converted string is terminated with a nul character.
	107	.Pp
	108	.Fn mbr_string_to_sid
	109	converts an external string representation into a sid.
	110	.Sh RETURN VALUES
	111	These functions return 0 on success or one of the following error codes on failure:
	112	.Bl -tag -width Er
	113	.It Bq Er EIO
	114	Communication with
	115	.Xr openditectoryd 8
	116	failed.
	117	.It Bq Er ENOENT
	118	The mapping can not be performed.
	119	.It Bq Er EAUTH
	120	Communication with
	121	.Xr openditectoryd 8
	122	failed due to an authentication error.
	123	.It Bq Er EINVAL
	124	Invalid arguments were provided.
	125	.It Bq Er ENOMEM
	126	Insufficient storage space is available.
	127	.El
	128	.Pp
	129	.Fn mbr_gid_to_uuid
	130	and
	131	.Fn mbr_uid_to_uuid
	132	return 0 (success), even if the user/group does not exist.
	133	.Sh SEE ALSO
	134	.Xr getpwuid 3 ,
	135	.Xr getgrgid 3 ,
	136	.Xr mbr_check_membership 3 ,
	137	.Xr openditectoryd 8