include/nsswitch.h

   1 /*      $NetBSD: nsswitch.h,v 1.6 1999/01/26 01:04:07 lukem Exp $       */
   2 /*      $FreeBSD: src/include/nsswitch.h,v 1.5 2007/12/12 10:08:02 bushman Exp $ */
   3
   4 /*-
   5  * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to The NetBSD Foundation
   9  * by Luke Mewburn.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *        This product includes software developed by the NetBSD
  22  *        Foundation, Inc. and its contributors.
  23  * 4. Neither the name of The NetBSD Foundation nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 #ifndef _NSSWITCH_H
  41 #define _NSSWITCH_H     1
  42
  43 #include <sys/types.h>
  44 #include <stdarg.h>
  45
  46 #define NSS_MODULE_INTERFACE_VERSION 1
  47
  48 #ifndef _PATH_NS_CONF
  49 #define _PATH_NS_CONF   "/etc/nsswitch.conf"
  50 #endif
  51
  52 /* NSS source actions */
  53 #define NS_ACTION_CONTINUE      0       /* try the next source */
  54 #define NS_ACTION_RETURN        1       /* look no further */
  55
  56 #define NS_SUCCESS      (1<<0)          /* entry was found */
  57 #define NS_UNAVAIL      (1<<1)          /* source not responding, or corrupt */
  58 #define NS_NOTFOUND     (1<<2)          /* source responded 'no such entry' */
  59 #define NS_TRYAGAIN     (1<<3)          /* source busy, may respond to retry */
  60 #define NS_RETURN       (1<<4)          /* stop search, e.g. for ERANGE */
  61 #define NS_TERMINATE    (NS_SUCCESS|NS_RETURN) /* flags that end search */
  62 #define NS_STATUSMASK   0x000000ff      /* bitmask to get the status flags */
  63
  64 /*
  65  * currently implemented sources
  66  */
  67 #define NSSRC_FILES     "files"         /* local files */
  68 #define NSSRC_DNS       "dns"           /* DNS; IN for hosts, HS for others */
  69 #define NSSRC_NIS       "nis"           /* YP/NIS */
  70 #define NSSRC_COMPAT    "compat"        /* passwd,group in YP compat mode */
  71 #define NSSRC_CACHE     "cache"         /* nscd daemon */
  72 #define NSSRC_FALLBACK  "__fallback"    /* internal fallback source */
  73
  74 /*
  75  * currently implemented databases
  76  */
  77 #define NSDB_HOSTS              "hosts"
  78 #define NSDB_GROUP              "group"
  79 #define NSDB_GROUP_COMPAT       "group_compat"
  80 #define NSDB_NETGROUP           "netgroup"
  81 #define NSDB_NETWORKS           "networks"
  82 #define NSDB_PASSWD             "passwd"
  83 #define NSDB_PASSWD_COMPAT      "passwd_compat"
  84 #define NSDB_SHELLS             "shells"
  85 #define NSDB_SERVICES           "services"
  86 #define NSDB_SERVICES_COMPAT    "services_compat"
  87 #define NSDB_SSH_HOSTKEYS       "ssh_hostkeys"
  88 #define NSDB_PROTOCOLS          "protocols"
  89 #define NSDB_RPC                "rpc"
  90
  91 /*
  92  * suggested databases to implement
  93  */
  94 #define NSDB_ALIASES            "aliases"
  95 #define NSDB_AUTH               "auth"
  96 #define NSDB_AUTOMOUNT          "automount"
  97 #define NSDB_BOOTPARAMS         "bootparams"
  98 #define NSDB_ETHERS             "ethers"
  99 #define NSDB_EXPORTS            "exports"
 100 #define NSDB_NETMASKS           "netmasks"
 101 #define NSDB_PHONES             "phones"
 102 #define NSDB_PRINTCAP           "printcap"
 103 #define NSDB_REMOTE             "remote"
 104 #define NSDB_SENDMAILVARS       "sendmailvars"
 105 #define NSDB_TERMCAP            "termcap"
 106 #define NSDB_TTYS               "ttys"
 107
 108 /*
 109  * ns_dtab `method' function signature.
 110  */
 111 typedef int (*nss_method)(void *_retval, void *_mdata, va_list _ap);
 112
 113 /*
 114  * Macro for generating method prototypes.
 115  */
 116 #define NSS_METHOD_PROTOTYPE(method) \
 117         int method(void *, void *, va_list)
 118
 119 /*
 120  * ns_dtab - `nsswitch dispatch table'
 121  * Contains an entry for each source and the appropriate function to
 122  * call.  ns_dtabs are used in the nsdispatch() API in order to allow
 123  * the application to override built-in actions.
 124  */
 125 typedef struct _ns_dtab {
 126         const char       *src;          /* Source this entry implements */
 127         nss_method        method;       /* Method to be called */
 128         void             *mdata;        /* Data passed to method */
 129 } ns_dtab;
 130
 131 /*
 132  * macros to help build an ns_dtab[]
 133  */
 134 #define NS_FILES_CB(F,C)        { NSSRC_FILES,  F,      C },
 135 #define NS_COMPAT_CB(F,C)       { NSSRC_COMPAT, F,      C },
 136 #define NS_FALLBACK_CB(F)       { NSSRC_FALLBACK, F,    NULL },
 137
 138 #ifdef HESIOD
 139 #   define NS_DNS_CB(F,C)       { NSSRC_DNS,    F,      C },
 140 #else
 141 #   define NS_DNS_CB(F,C)
 142 #endif
 143
 144 #ifdef YP
 145 #   define NS_NIS_CB(F,C)       { NSSRC_NIS,    F,      C },
 146 #else
 147 #   define NS_NIS_CB(F,C)
 148 #endif
 149
 150 /*
 151  * ns_src - `nsswitch source'
 152  * used by the nsparser routines to store a mapping between a source
 153  * and its dispatch control flags for a given database.
 154  */
 155 typedef struct _ns_src {
 156         const char      *name;
 157         u_int32_t        flags;
 158 } ns_src;
 159
 160
 161 /*
 162  * default sourcelist (if nsswitch.conf is missing, corrupt,
 163  * or the requested database doesn't have an entry.
 164  */
 165 extern const ns_src __nsdefaultsrc[];
 166
 167 /*
 168  * ns_mtab - NSS method table
 169  * An NSS module provides a mapping from (database name, method name)
 170  * tuples to the nss_method and associated data.
 171  */
 172 typedef struct _ns_mtab {
 173         const char      *database;
 174         const char      *name;
 175         nss_method       method;
 176         void            *mdata;
 177 } ns_mtab;
 178
 179 /*
 180  * NSS module de-registration, called at module unload.
 181  */
 182 typedef void     (*nss_module_unregister_fn)(ns_mtab *, unsigned int);
 183
 184 /*
 185  * NSS module registration, called at module load.
 186  */
 187 typedef ns_mtab *(*nss_module_register_fn)(const char *, unsigned int *,
 188                        nss_module_unregister_fn *);
 189
 190 /*
 191  * Many NSS interfaces follow the getXXnam, getXXid, getXXent pattern.
 192  * Developers are encouraged to use nss_lookup_type where approriate.
 193  */
 194 enum nss_lookup_type {
 195         nss_lt_name = 1,
 196         nss_lt_id   = 2,
 197         nss_lt_all  = 3
 198 };
 199
 200 #ifdef _NS_PRIVATE
 201 /*
 202  * private data structures for back-end nsswitch implementation
 203  */
 204
 205 /*
 206  * ns_dbt - `nsswitch database thang'
 207  * for each database in /etc/nsswitch.conf there is a ns_dbt, with its
 208  * name and a list of ns_src's containing the source information.
 209  */
 210 typedef struct _ns_dbt {
 211         const char      *name;          /* name of database */
 212         ns_src          *srclist;       /* list of sources */
 213         int              srclistsize;   /* size of srclist */
 214 } ns_dbt;
 215
 216 /*
 217  * ns_mod - NSS module
 218  */
 219 typedef struct _ns_mod {
 220         char            *name;          /* module name */
 221         void            *handle;        /* handle from dlopen */
 222         ns_mtab         *mtab;          /* method table */
 223         unsigned int     mtabsize;      /* count of entries in method table */
 224         nss_module_unregister_fn unregister; /* called to unload module */
 225 } ns_mod;
 226
 227 #endif /* _NS_PRIVATE */
 228
 229
 230 #include <sys/cdefs.h>
 231
 232 __BEGIN_DECLS
 233 extern  int     nsdispatch(void *, const ns_dtab [], const char *,
 234                            const char *, const ns_src [], ...);
 235
 236 #ifdef _NS_PRIVATE
 237 extern  void             _nsdbtaddsrc(ns_dbt *, const ns_src *);
 238 extern  void             _nsdbtput(const ns_dbt *);
 239 extern  void             _nsyyerror(const char *);
 240 extern  int              _nsyylex(void);
 241 extern  int              _nsyyparse(void);
 242 extern  int              _nsyylineno;
 243 #ifdef _NSS_DEBUG
 244 extern  void             _nsdbtdump(const ns_dbt *);
 245 #endif
 246 #endif /* _NS_PRIVATE */
 247
 248 __END_DECLS
 249
 250 #endif /* !_NSSWITCH_H */