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_DNS "dns" /* DNS; IN for hosts, HS for others */ 62 #define NSSRC_NIS "nis" /* YP/NIS */ 63 #define NSSRC_COMPAT "compat" /* passwd,group in YP compat mode */ 64 #define NSSRC_CACHE "cache" /* nscd daemon */ 65 #define NSSRC_FALLBACK "__fallback" /* internal fallback source */ 66 67 /* 68 * currently implemented databases 69 */ 70 #define NSDB_HOSTS "hosts" 71 #define NSDB_GROUP "group" 72 #define NSDB_GROUP_COMPAT "group_compat" 73 #define NSDB_NETGROUP "netgroup" 74 #define NSDB_NETWORKS "networks" 75 #define NSDB_PASSWD "passwd" 76 #define NSDB_PASSWD_COMPAT "passwd_compat" 77 #define NSDB_SHELLS "shells" 78 #define NSDB_SERVICES "services" 79 #define NSDB_SERVICES_COMPAT "services_compat" 80 #define NSDB_SSH_HOSTKEYS "ssh_hostkeys" 81 #define NSDB_PROTOCOLS "protocols" 82 #define NSDB_RPC "rpc" 83 84 /* 85 * suggested databases to implement 86 */ 87 #define NSDB_ALIASES "aliases" 88 #define NSDB_AUTH "auth" 89 #define NSDB_AUTOMOUNT "automount" 90 #define NSDB_BOOTPARAMS "bootparams" 91 #define NSDB_ETHERS "ethers" 92 #define NSDB_EXPORTS "exports" 93 #define NSDB_NETMASKS "netmasks" 94 #define NSDB_PHONES "phones" 95 #define NSDB_PRINTCAP "printcap" 96 #define NSDB_REMOTE "remote" 97 #define NSDB_SENDMAILVARS "sendmailvars" 98 #define NSDB_TERMCAP "termcap" 99 #define NSDB_TTYS "ttys" 100 101 /* 102 * ns_dtab `method' function signature. 103 */ 104 typedef int (*nss_method)(void *_retval, void *_mdata, va_list _ap); 105 106 /* 107 * Macro for generating method prototypes. 108 */ 109 #define NSS_METHOD_PROTOTYPE(method) \ 110 int method(void *, void *, va_list) 111 112 /* 113 * ns_dtab - `nsswitch dispatch table' 114 * Contains an entry for each source and the appropriate function to 115 * call. ns_dtabs are used in the nsdispatch() API in order to allow 116 * the application to override built-in actions. 117 */ 118 typedef struct _ns_dtab { 119 const char *src; /* Source this entry implements */ 120 nss_method method; /* Method to be called */ 121 void *mdata; /* Data passed to method */ 122 } ns_dtab; 123 124 /* 125 * macros to help build an ns_dtab[] 126 */ 127 #define NS_FILES_CB(F,C) { NSSRC_FILES, F, C }, 128 #define NS_COMPAT_CB(F,C) { NSSRC_COMPAT, F, C }, 129 #define NS_FALLBACK_CB(F) { NSSRC_FALLBACK, F, NULL }, 130 131 #ifdef HESIOD 132 # define NS_DNS_CB(F,C) { NSSRC_DNS, F, C }, 133 #else 134 # define NS_DNS_CB(F,C) 135 #endif 136 137 #ifdef YP 138 # define NS_NIS_CB(F,C) { NSSRC_NIS, F, C }, 139 #else 140 # define NS_NIS_CB(F,C) 141 #endif 142 143 /* 144 * ns_src - `nsswitch source' 145 * used by the nsparser routines to store a mapping between a source 146 * and its dispatch control flags for a given database. 147 */ 148 typedef struct _ns_src { 149 const char *name; 150 u_int32_t flags; 151 } ns_src; 152 153 154 /* 155 * default sourcelist (if nsswitch.conf is missing, corrupt, 156 * or the requested database doesn't have an entry. 157 */ 158 extern const ns_src __nsdefaultsrc[]; 159 160 /* 161 * ns_mtab - NSS method table 162 * An NSS module provides a mapping from (database name, method name) 163 * tuples to the nss_method and associated data. 164 */ 165 typedef struct _ns_mtab { 166 const char *database; 167 const char *name; 168 nss_method method; 169 void *mdata; 170 } ns_mtab; 171 172 /* 173 * NSS module de-registration, called at module unload. 174 */ 175 typedef void (*nss_module_unregister_fn)(ns_mtab *, unsigned int); 176 177 /* 178 * NSS module registration, called at module load. 179 */ 180 typedef ns_mtab *(*nss_module_register_fn)(const char *, unsigned int *, 181 nss_module_unregister_fn *); 182 183 /* 184 * Many NSS interfaces follow the getXXnam, getXXid, getXXent pattern. 185 * Developers are encouraged to use nss_lookup_type where approriate. 186 */ 187 enum nss_lookup_type { 188 nss_lt_name = 1, 189 nss_lt_id = 2, 190 nss_lt_all = 3 191 }; 192 193 #ifdef _NS_PRIVATE 194 /* 195 * private data structures for back-end nsswitch implementation 196 */ 197 198 /* 199 * ns_dbt - `nsswitch database thang' 200 * for each database in /etc/nsswitch.conf there is a ns_dbt, with its 201 * name and a list of ns_src's containing the source information. 202 */ 203 typedef struct _ns_dbt { 204 const char *name; /* name of database */ 205 ns_src *srclist; /* list of sources */ 206 int srclistsize; /* size of srclist */ 207 } ns_dbt; 208 209 /* 210 * ns_mod - NSS module 211 */ 212 typedef struct _ns_mod { 213 char *name; /* module name */ 214 void *handle; /* handle from dlopen */ 215 ns_mtab *mtab; /* method table */ 216 unsigned int mtabsize; /* count of entries in method table */ 217 nss_module_unregister_fn unregister; /* called to unload module */ 218 } ns_mod; 219 220 #endif /* _NS_PRIVATE */ 221 222 223 #include <sys/cdefs.h> 224 225 __BEGIN_DECLS 226 extern int nsdispatch(void *, const ns_dtab [], const char *, 227 const char *, const ns_src [], ...); 228 229 #ifdef _NS_PRIVATE 230 extern void _nsdbtaddsrc(ns_dbt *, const ns_src *); 231 extern void _nsdbtput(const ns_dbt *); 232 extern void _nsyyerror(const char *); 233 extern int _nsyylex(void); 234 extern int _nsyyparse(void); 235 extern int _nsyylineno; 236 #ifdef _NSS_DEBUG 237 extern void _nsdbtdump(const ns_dbt *); 238 #endif 239 #endif /* _NS_PRIVATE */ 240 241 __END_DECLS 242 243 #endif /* !_NSSWITCH_H */ 244