/*	$NetBSD: nsswitch.h,v 1.6 1999/01/26 01:04:07 lukem Exp $	*/

/*	$FreeBSD: src/include/nsswitch.h,v 1.3 2003/04/17 14:14:21 nectar Exp $ */

/*-

 * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.

 * All rights reserved.

 *

 * This code is derived from software contributed to The NetBSD Foundation

 * by Luke Mewburn.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 4. Neither the name of The NetBSD Foundation nor the names of its

 *    contributors may be used to endorse or promote products derived

 *    from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS

 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS

 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 * Portions Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

 */

#ifndef _NSSWITCH_H

#define _NSSWITCH_H	1

#include <sys/types.h>

#include <stdarg.h>

#define NSS_MODULE_INTERFACE_VERSION 1

#ifndef _PATH_NS_CONF

#define _PATH_NS_CONF	"/etc/nsswitch.conf"

#endif

/* NSS source actions */

#define	NS_ACTION_CONTINUE	0	/* try the next source */

#define	NS_ACTION_RETURN	1	/* look no further */

#define	NS_SUCCESS	(1<<0)		/* entry was found */

#define	NS_UNAVAIL	(1<<1)		/* source not responding, or corrupt */

#define	NS_NOTFOUND	(1<<2)		/* source responded 'no such entry' */

#define	NS_TRYAGAIN	(1<<3)		/* source busy, may respond to retry */

#define NS_RETURN	(1<<4)		/* stop search, e.g. for ERANGE */

#define NS_TERMINATE	(NS_SUCCESS|NS_RETURN) /* flags that end search */

#define	NS_STATUSMASK	0x000000ff	/* bitmask to get the status flags */

/*

 * currently implemented sources

 */

#define NSSRC_FILES	"files"		/* local files */

#define	NSSRC_DNS	"dns"		/* DNS; IN for hosts, HS for others */

#define	NSSRC_NIS	"nis"		/* YP/NIS */

#define	NSSRC_COMPAT	"compat"	/* passwd,group in YP compat mode */

/*

 * currently implemented databases

 */

#define NSDB_HOSTS		"hosts"

#define NSDB_GROUP		"group"

#define NSDB_GROUP_COMPAT	"group_compat"

#define NSDB_NETGROUP		"netgroup"

#define NSDB_NETWORKS		"networks"

#define NSDB_PASSWD		"passwd"

#define NSDB_PASSWD_COMPAT	"passwd_compat"

#define NSDB_SHELLS		"shells"

/*

 * suggested databases to implement

 */

#define NSDB_ALIASES		"aliases"

#define NSDB_AUTH		"auth"

#define NSDB_AUTOMOUNT		"automount"

#define NSDB_BOOTPARAMS		"bootparams"

#define NSDB_ETHERS		"ethers"

#define NSDB_EXPORTS		"exports"

#define NSDB_NETMASKS		"netmasks"

#define NSDB_PHONES		"phones"

#define NSDB_PRINTCAP		"printcap"

#define NSDB_PROTOCOLS		"protocols"

#define NSDB_REMOTE		"remote"

#define NSDB_RPC		"rpc"

#define NSDB_SENDMAILVARS	"sendmailvars"

#define NSDB_SERVICES		"services"

#define NSDB_TERMCAP		"termcap"

#define NSDB_TTYS		"ttys"

/*

 * ns_dtab `method' function signature.

 */ 

typedef int (*nss_method)(void *_retval, void *_mdata, va_list _ap);

/*

 * Macro for generating method prototypes.

 */

#define NSS_METHOD_PROTOTYPE(method) \

	int method(void *, void *, va_list)

/*

 * ns_dtab - `nsswitch dispatch table'

 * Contains an entry for each source and the appropriate function to

 * call.  ns_dtabs are used in the nsdispatch() API in order to allow

 * the application to override built-in actions.

 */

typedef struct _ns_dtab {

	const char	 *src;		/* Source this entry implements */

	nss_method	  method;	/* Method to be called */

	void		 *mdata;	/* Data passed to method */

} ns_dtab;

/*

 * macros to help build an ns_dtab[]

 */

#define NS_FILES_CB(F,C)	{ NSSRC_FILES,	F,	C },

#define NS_COMPAT_CB(F,C)	{ NSSRC_COMPAT,	F,	C },

#ifdef HESIOD

#   define NS_DNS_CB(F,C)	{ NSSRC_DNS,	F,	C },

#else

#   define NS_DNS_CB(F,C)

#endif

#ifdef YP

#   define NS_NIS_CB(F,C)	{ NSSRC_NIS,	F,	C },

#else

#   define NS_NIS_CB(F,C)

#endif

/*

 * ns_src - `nsswitch source'

 * used by the nsparser routines to store a mapping between a source

 * and its dispatch control flags for a given database.

 */

typedef struct _ns_src {

	const char	*name;

	u_int32_t	 flags;

} ns_src;

/*

 * default sourcelist (if nsswitch.conf is missing, corrupt,

 * or the requested database doesn't have an entry.

 */

extern const ns_src __nsdefaultsrc[];

/*

 * ns_mtab - NSS method table

 * An NSS module provides a mapping from (database name, method name)

 * tuples to the nss_method and associated data.

 */

typedef struct _ns_mtab {

	const char	*database;

	const char	*name;

	nss_method	 method;

	void		*mdata;

} ns_mtab;

/*

 * NSS module de-registration, called at module unload.

 */

typedef void	 (*nss_module_unregister_fn)(ns_mtab *, unsigned int);

/*

 * NSS module registration, called at module load.

 */

typedef ns_mtab *(*nss_module_register_fn)(const char *, unsigned int *,

		       nss_module_unregister_fn *);

/* 

 * Many NSS interfaces follow the getXXnam, getXXid, getXXent pattern.

 * Developers are encouraged to use nss_lookup_type where approriate.

 */

enum nss_lookup_type {

	nss_lt_name = 1,

	nss_lt_id   = 2,

	nss_lt_all  = 3

};

#ifdef _NS_PRIVATE

/*

 * private data structures for back-end nsswitch implementation

 */

/*

 * ns_dbt - `nsswitch database thang'

 * for each database in /etc/nsswitch.conf there is a ns_dbt, with its

 * name and a list of ns_src's containing the source information.

 */

typedef struct _ns_dbt {

	const char	*name;		/* name of database */

	ns_src		*srclist;	/* list of sources */

	int		 srclistsize;	/* size of srclist */

} ns_dbt;

/*

 * ns_mod - NSS module

 */

typedef struct _ns_mod {

	char		*name;		/* module name */

	void		*handle;	/* handle from dlopen */

	ns_mtab		*mtab;		/* method table */

	unsigned int	 mtabsize;	/* count of entries in method table */

	nss_module_unregister_fn unregister; /* called to unload module */

} ns_mod;

#endif /* _NS_PRIVATE */

#endif /* !_NSSWITCH_H */