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freebsd/include/nsswitch.h
Jacques Vidrine 46d9306383 = Implement name service switch modules (NSS modules). NSS modules 
may be built into libc (`static NSS modules') or dynamically loaded
  via dlopen (`dynamic NSS modules').  Modules are loaded/initialized
  at configuration time (i.e.  when nsdispatch is called and nsswitch.conf
  is read or re-read).

= Make the nsdispatch(3) core thread-safe.

= New status code for nsdispatch(3) `NS_RETURN', currently used to
  signal ERANGE-type issues.

= syslog(3) problems, don't warn/err/abort.

= Try harder to avoid namespace pollution.

= Implement some shims to assist in porting NSS modules written for
  the GNU C Library nsswitch interface.

Sponsored by:	DARPA, Network Associates Laboratories
2003-04-17 14:14:22 +00:00

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/* $NetBSD: nsswitch.h,v 1.6 1999/01/26 01:04:07 lukem Exp $ */
/* $FreeBSD$ */
/*-
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 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.
*/
#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 */
#include <sys/cdefs.h>
__BEGIN_DECLS
extern int nsdispatch(void *, const ns_dtab [], const char *,
const char *, const ns_src [], ...);
#ifdef _NS_PRIVATE
extern void _nsdbtaddsrc(ns_dbt *, const ns_src *);
extern void _nsdbtput(const ns_dbt *);
extern void _nsyyerror(const char *);
extern int _nsyylex(void);
extern int _nsyyparse(void);
extern int _nsyylineno;
#ifdef _NSS_DEBUG
extern void _nsdbtdump(const ns_dbt *);
#endif
#endif /* _NS_PRIVATE */
__END_DECLS
#endif /* !_NSSWITCH_H */
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