1 /* $NetBSD: nsswitch.h,v 1.21 2011/07/17 20:54:34 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 1999, 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _NSSWITCH_H 33 #define _NSSWITCH_H 1 34 35 #include <sys/types.h> 36 #include <stdarg.h> 37 38 #define NSS_MODULE_INTERFACE_VERSION 0 39 40 #ifndef _PATH_NS_CONF 41 #define _PATH_NS_CONF "/etc/nsswitch.conf" 42 #endif 43 44 #define NS_CONTINUE 0 45 #define NS_RETURN 1 46 47 /* 48 * Layout of: 49 * uint32_t ns_src.flags 50 */ 51 /* nsswitch.conf status codes and nsdispatch(3) return values */ 52 #define NS_SUCCESS (1<<0) /* entry was found */ 53 #define NS_UNAVAIL (1<<1) /* source not responding, or corrupt */ 54 #define NS_NOTFOUND (1<<2) /* source responded 'no such entry' */ 55 #define NS_TRYAGAIN (1<<3) /* source busy, may respond to retrys */ 56 #define NS_STATUSMASK 0x000000ff /* bitmask to get the status flags */ 57 58 /* internal nsdispatch(3) flags; not settable in nsswitch.conf(5) */ 59 #define NS_FORCEALL (1<<8) /* force all methods to be invoked; */ 60 61 /* 62 * Currently implemented sources. 63 */ 64 #define NSSRC_FILES "files" /* local files */ 65 #define NSSRC_DNS "dns" /* DNS; IN for hosts, HS for others */ 66 #define NSSRC_NIS "nis" /* YP/NIS */ 67 #define NSSRC_COMPAT "compat" /* passwd,group in YP compat mode */ 68 69 /* 70 * Currently implemented databases. 71 */ 72 #define NSDB_HOSTS "hosts" 73 #define NSDB_GROUP "group" 74 #define NSDB_GROUP_COMPAT "group_compat" 75 #define NSDB_NETGROUP "netgroup" 76 #define NSDB_NETWORKS "networks" 77 #define NSDB_PASSWD "passwd" 78 #define NSDB_PASSWD_COMPAT "passwd_compat" 79 #define NSDB_SHELLS "shells" 80 81 /* 82 * Suggested databases to implement. 83 */ 84 #define NSDB_ALIASES "aliases" 85 #define NSDB_AUTH "auth" 86 #define NSDB_AUTOMOUNT "automount" 87 #define NSDB_BOOTPARAMS "bootparams" 88 #define NSDB_ETHERS "ethers" 89 #define NSDB_EXPORTS "exports" 90 #define NSDB_NETMASKS "netmasks" 91 #define NSDB_PHONES "phones" 92 #define NSDB_PRINTCAP "printcap" 93 #define NSDB_PROTOCOLS "protocols" 94 #define NSDB_REMOTE "remote" 95 #define NSDB_RPC "rpc" 96 #define NSDB_SENDMAILVARS "sendmailvars" 97 #define NSDB_SERVICES "services" 98 #define NSDB_TERMCAP "termcap" 99 #define NSDB_TTYS "ttys" 100 101 /* 102 * ns_dtab `callback' function signature. 103 */ 104 typedef int (*nss_method)(void *, void *, va_list); 105 106 /* 107 * ns_dtab - `nsswitch dispatch table' 108 * Contains an entry for each source and the appropriate function to call. 109 */ 110 typedef struct { 111 const char *src; 112 nss_method callback; 113 void *cb_data; 114 } ns_dtab; 115 116 /* 117 * Macros to help build an ns_dtab[] 118 */ 119 #define NS_FILES_CB(F,C) { NSSRC_FILES, F, __UNCONST(C) }, 120 #define NS_COMPAT_CB(F,C) { NSSRC_COMPAT, F, __UNCONST(C) }, 121 122 #ifdef HESIOD 123 # define NS_DNS_CB(F,C) { NSSRC_DNS, F, __UNCONST(C) }, 124 #else 125 # define NS_DNS_CB(F,C) 126 #endif 127 128 #ifdef YP 129 # define NS_NIS_CB(F,C) { NSSRC_NIS, F, __UNCONST(C) }, 130 #else 131 # define NS_NIS_CB(F,C) 132 #endif 133 #define NS_NULL_CB { .src = NULL }, 134 135 /* 136 * ns_src - `nsswitch source' 137 * Used by the nsparser routines to store a mapping between a source 138 * and its dispatch control flags for a given database. 139 */ 140 typedef struct { 141 const char *name; 142 uint32_t flags; 143 } ns_src; 144 145 146 /* 147 * Default sourcelists (if nsswitch.conf is missing, corrupt, 148 * or the requested database doesn't have an entry) 149 */ 150 extern const ns_src __nsdefaultsrc[]; 151 extern const ns_src __nsdefaultcompat[]; 152 extern const ns_src __nsdefaultcompat_forceall[]; 153 extern const ns_src __nsdefaultfiles[]; 154 extern const ns_src __nsdefaultfiles_forceall[]; 155 extern const ns_src __nsdefaultnis[]; 156 extern const ns_src __nsdefaultnis_forceall[]; 157 158 159 /* 160 * ns_mtab - `nsswitch method table' 161 * An nsswitch module provides a mapping from (database name, method name) 162 * tuples to the nss_method and associated callback data. Effectively, 163 * ns_dtab, but used for dynamically loaded modules. 164 */ 165 typedef struct { 166 const char *database; 167 const char *name; 168 nss_method method; 169 void *mdata; 170 } ns_mtab; 171 172 /* 173 * nss_module_register_fn - module registration function 174 * called at module load 175 * nss_module_unregister_fn - module un-registration function 176 * called at module unload 177 */ 178 typedef void (*nss_module_unregister_fn)(ns_mtab *, u_int); 179 typedef ns_mtab *(*nss_module_register_fn)(const char *, u_int *, 180 nss_module_unregister_fn *); 181 182 #ifdef _NS_PRIVATE 183 184 /* 185 * Private data structures for back-end nsswitch implementation. 186 */ 187 188 /* 189 * ns_dbt - `nsswitch database thang' 190 * For each database in /etc/nsswitch.conf there is a ns_dbt, with its 191 * name and a list of ns_src's containing the source information. 192 */ 193 typedef struct { 194 const char *name; /* name of database */ 195 ns_src *srclist; /* list of sources */ 196 u_int srclistsize; /* size of srclist */ 197 } ns_dbt; 198 199 /* 200 * ns_mod - `nsswitch module' 201 */ 202 typedef struct { 203 const char *name; /* module name */ 204 void *handle; /* handle from dlopen() */ 205 ns_mtab *mtab; /* method table */ 206 u_int mtabsize; /* size of mtab */ 207 /* called to unload module */ 208 nss_module_unregister_fn unregister; 209 } ns_mod; 210 211 #endif /* _NS_PRIVATE */ 212 213 214 #include <sys/cdefs.h> 215 216 __BEGIN_DECLS 217 int nsdispatch(void *, const ns_dtab [], const char *, 218 const char *, const ns_src [], ...) __LIBC_ABI_PUBLIC__; 219 220 #ifdef _NS_PRIVATE 221 int _nsdbtaddsrc(ns_dbt *, const ns_src *); 222 void _nsdbtdump(const ns_dbt *); 223 int _nsdbtput(const ns_dbt *); 224 void _nsyyerror(const char *); 225 int _nsyylex(void); 226 #endif /* _NS_PRIVATE */ 227 228 __END_DECLS 229 230 #endif /* !_NSSWITCH_H */ 231