source: rtems-libbsd/freebsd-userspace/include/nsswitch.h @ bf4a338

/*      $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_DB        "db"            /* database */
#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 */
#define NSSRC_CACHE     "cache"         /* nscd daemon */
#define NSSRC_FALLBACK  "__fallback"    /* internal fallback source */

/*
 * 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"
#define NSDB_SERVICES           "services"
#define NSDB_SERVICES_COMPAT    "services_compat"
#define NSDB_SSH_HOSTKEYS       "ssh_hostkeys"
#define NSDB_PROTOCOLS          "protocols"
#define NSDB_RPC                "rpc"

/*
 * 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_REMOTE             "remote"
#define NSDB_SENDMAILVARS       "sendmailvars"
#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 },
#define NS_FALLBACK_CB(F)       { NSSRC_FALLBACK, F,    NULL },
 
#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 */