1/* $NetBSD: nsswitch.h,v 1.6 1999/01/26 01:04:07 lukem Exp $ */ 2/* $FreeBSD$ */ 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#ifndef _NSSWITCH_H 34#define _NSSWITCH_H 1 35 36#include <sys/types.h> 37#include <stdarg.h> 38 39#define NSS_MODULE_INTERFACE_VERSION 1 40 41#ifndef _PATH_NS_CONF 42#define _PATH_NS_CONF "/etc/nsswitch.conf" 43#endif 44 45/* NSS source actions */ 46#define NS_ACTION_CONTINUE 0 /* try the next source */ 47#define NS_ACTION_RETURN 1 /* look no further */ 48 49#define NS_SUCCESS (1<<0) /* entry was found */ 50#define NS_UNAVAIL (1<<1) /* source not responding, or corrupt */ 51#define NS_NOTFOUND (1<<2) /* source responded 'no such entry' */ 52#define NS_TRYAGAIN (1<<3) /* source busy, may respond to retry */ 53#define NS_RETURN (1<<4) /* stop search, e.g. for ERANGE */ 54#define NS_TERMINATE (NS_SUCCESS|NS_RETURN) /* flags that end search */ 55#define NS_STATUSMASK 0x000000ff /* bitmask to get the status flags */ 56 57/* 58 * currently implemented sources 59 */ 60#define NSSRC_FILES "files" /* local files */ 61#define NSSRC_DB "db" /* database */ 62#define NSSRC_DNS "dns" /* DNS; IN for hosts, HS for others */ 63#define NSSRC_NIS "nis" /* YP/NIS */ 64#define NSSRC_COMPAT "compat" /* passwd,group in YP compat mode */ 65#define NSSRC_CACHE "cache" /* nscd daemon */ 66#define NSSRC_FALLBACK "__fallback" /* internal fallback source */ 67 68/* 69 * currently implemented databases 70 */ 71#define NSDB_HOSTS "hosts" 72#define NSDB_GROUP "group" 73#define NSDB_GROUP_COMPAT "group_compat" 74#define NSDB_NETGROUP "netgroup" 75#define NSDB_NETWORKS "networks" 76#define NSDB_PASSWD "passwd" 77#define NSDB_PASSWD_COMPAT "passwd_compat" 78#define NSDB_SHELLS "shells" 79#define NSDB_SERVICES "services" 80#define NSDB_SERVICES_COMPAT "services_compat" 81#define NSDB_SSH_HOSTKEYS "ssh_hostkeys" 82#define NSDB_PROTOCOLS "protocols" 83#define NSDB_RPC "rpc" 84 85/* 86 * suggested databases to implement 87 */ 88#define NSDB_ALIASES "aliases" 89#define NSDB_AUTH "auth" 90#define NSDB_AUTOMOUNT "automount" 91#define NSDB_BOOTPARAMS "bootparams" 92#define NSDB_ETHERS "ethers" 93#define NSDB_EXPORTS "exports" 94#define NSDB_NETMASKS "netmasks" 95#define NSDB_PHONES "phones" 96#define NSDB_PRINTCAP "printcap" 97#define NSDB_REMOTE "remote" 98#define NSDB_SENDMAILVARS "sendmailvars" 99#define NSDB_TERMCAP "termcap" 100#define NSDB_TTYS "ttys" 101 102/* 103 * ns_dtab `method' function signature. 104 */ 105typedef int (*nss_method)(void *_retval, void *_mdata, va_list _ap); 106 107/* 108 * Macro for generating method prototypes. 109 */ 110#define NSS_METHOD_PROTOTYPE(method) \ 111 int method(void *, void *, va_list) 112 113/* 114 * ns_dtab - `nsswitch dispatch table' 115 * Contains an entry for each source and the appropriate function to 116 * call. ns_dtabs are used in the nsdispatch() API in order to allow 117 * the application to override built-in actions. 118 */ 119typedef struct _ns_dtab { 120 const char *src; /* Source this entry implements */ 121 nss_method method; /* Method to be called */ 122 void *mdata; /* Data passed to method */ 123} ns_dtab; 124 125/* 126 * macros to help build an ns_dtab[] 127 */ 128#define NS_FILES_CB(F,C) { NSSRC_FILES, F, C }, 129#define NS_COMPAT_CB(F,C) { NSSRC_COMPAT, F, C }, 130#define NS_FALLBACK_CB(F) { NSSRC_FALLBACK, F, NULL }, 131 132#ifdef HESIOD 133# define NS_DNS_CB(F,C) { NSSRC_DNS, F, C }, 134#else 135# define NS_DNS_CB(F,C) 136#endif 137 138#ifdef YP 139# define NS_NIS_CB(F,C) { NSSRC_NIS, F, C }, 140#else 141# define NS_NIS_CB(F,C) 142#endif 143 144/* 145 * ns_src - `nsswitch source' 146 * used by the nsparser routines to store a mapping between a source 147 * and its dispatch control flags for a given database. 148 */ 149typedef struct _ns_src { 150 const char *name; 151 u_int32_t flags; 152} ns_src; 153 154 155/* 156 * default sourcelist (if nsswitch.conf is missing, corrupt, 157 * or the requested database doesn't have an entry. 158 */ 159extern const ns_src __nsdefaultsrc[]; 160 161/* 162 * ns_mtab - NSS method table 163 * An NSS module provides a mapping from (database name, method name) 164 * tuples to the nss_method and associated data. 165 */ 166typedef struct _ns_mtab { 167 const char *database; 168 const char *name; 169 nss_method method; 170 void *mdata; 171} ns_mtab; 172 173/* 174 * NSS module de-registration, called at module unload. 175 */ 176typedef void (*nss_module_unregister_fn)(ns_mtab *, unsigned int); 177 178/* 179 * NSS module registration, called at module load. 180 */ 181typedef ns_mtab *(*nss_module_register_fn)(const char *, unsigned int *, 182 nss_module_unregister_fn *); 183 184/* 185 * Many NSS interfaces follow the getXXnam, getXXid, getXXent pattern. 186 * Developers are encouraged to use nss_lookup_type where approriate. 187 */ 188enum nss_lookup_type { 189 nss_lt_name = 1, 190 nss_lt_id = 2, 191 nss_lt_all = 3 192}; 193 194#ifdef _NS_PRIVATE 195/* 196 * private data structures for back-end nsswitch implementation 197 */ 198 199/* 200 * ns_dbt - `nsswitch database thang' 201 * for each database in /etc/nsswitch.conf there is a ns_dbt, with its 202 * name and a list of ns_src's containing the source information. 203 */ 204typedef struct _ns_dbt { 205 const char *name; /* name of database */ 206 ns_src *srclist; /* list of sources */ 207 int srclistsize; /* size of srclist */ 208} ns_dbt; 209 210/* 211 * ns_mod - NSS module 212 */ 213typedef struct _ns_mod { 214 char *name; /* module name */ 215 void *handle; /* handle from dlopen */ 216 ns_mtab *mtab; /* method table */ 217 unsigned int mtabsize; /* count of entries in method table */ 218 nss_module_unregister_fn unregister; /* called to unload module */ 219} ns_mod; 220 221#endif /* _NS_PRIVATE */ 222 223 224#include <sys/cdefs.h> 225 226__BEGIN_DECLS 227extern int nsdispatch(void *, const ns_dtab [], const char *, 228 const char *, const ns_src [], ...); 229 230#ifdef _NS_PRIVATE 231extern void _nsdbtaddsrc(ns_dbt *, const ns_src *); 232extern void _nsdbtput(const ns_dbt *); 233extern void _nsyyerror(const char *); 234extern int _nsyylex(void); 235extern int _nsyyparse(void); 236extern int _nsyylineno; 237#ifdef _NSS_DEBUG 238extern void _nsdbtdump(const ns_dbt *); 239#endif 240#endif /* _NS_PRIVATE */ 241 242__END_DECLS 243 244#endif /* !_NSSWITCH_H */ 245