1 /*- 2 * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/lib/libc/include/nscache.h,v 1.1 2006/04/28 12:03:35 ume Exp $ 27 */ 28 29 #ifndef __NS_CACHE_H__ 30 #define __NS_CACHE_H__ 31 32 #include "nscachedcli.h" 33 34 typedef int (*nss_cache_id_func_t)(char *, size_t *, va_list, void *); 35 typedef int (*nss_cache_marshal_func_t)(char *, size_t *, void *, va_list, 36 void *); 37 typedef int (*nss_cache_unmarshal_func_t)(char *, size_t, void *, va_list, 38 void *); 39 40 typedef void (*nss_set_mp_ws_func_t)(cached_mp_write_session); 41 typedef cached_mp_write_session (*nss_get_mp_ws_func_t)(void); 42 43 typedef void (*nss_set_mp_rs_func_t)(cached_mp_read_session); 44 typedef cached_mp_read_session (*nss_get_mp_rs_func_t)(void); 45 46 typedef struct _nss_cache_info { 47 char *entry_name; 48 void *mdata; 49 50 /* 51 * These 3 functions should be implemented specifically for each 52 * nsswitch database. 53 */ 54 nss_cache_id_func_t id_func; /* marshals the request parameters */ 55 nss_cache_marshal_func_t marshal_func; /* marshals response */ 56 nss_cache_unmarshal_func_t unmarshal_func; /* unmarshals response */ 57 58 /* 59 * These 4 functions should be generated with NSS_MP_CACHE_HANDLING 60 * macro. 61 */ 62 nss_set_mp_ws_func_t set_mp_ws_func; /* sets current write session */ 63 nss_get_mp_ws_func_t get_mp_ws_func; /* gets current write session */ 64 65 nss_set_mp_rs_func_t set_mp_rs_func; /* sets current read session */ 66 nss_get_mp_rs_func_t get_mp_rs_func; /* gets current read session */ 67 } nss_cache_info; 68 69 /* 70 * NSS_MP_CACHE_HANDLING implements the set_mp_ws, get_mp_ws, set_mp_rs, 71 * get_mp_rs functions, that are used in _nss_cache_info. It uses 72 * NSS_TLS_HANDLING macro to organize thread local storage. 73 */ 74 #define NSS_MP_CACHE_HANDLING(name) \ 75 struct name##_mp_state { \ 76 cached_mp_write_session mp_write_session; \ 77 cached_mp_read_session mp_read_session; \ 78 }; \ 79 \ 80 static void \ 81 name##_mp_endstate(void *s) { \ 82 struct name##_mp_state *mp_state; \ 83 \ 84 mp_state = (struct name##_mp_state *)s; \ 85 if (mp_state->mp_write_session != INVALID_CACHED_MP_WRITE_SESSION)\ 86 __abandon_cached_mp_write_session(mp_state->mp_write_session);\ 87 \ 88 if (mp_state->mp_read_session != INVALID_CACHED_MP_READ_SESSION)\ 89 __close_cached_mp_read_session(mp_state->mp_read_session);\ 90 } \ 91 NSS_TLS_HANDLING(name##_mp); \ 92 \ 93 static void \ 94 name##_set_mp_ws(cached_mp_write_session ws) \ 95 { \ 96 struct name##_mp_state *mp_state; \ 97 int res; \ 98 \ 99 res = name##_mp_getstate(&mp_state); \ 100 if (res != 0) \ 101 return; \ 102 \ 103 mp_state->mp_write_session = ws; \ 104 } \ 105 \ 106 static cached_mp_write_session \ 107 name##_get_mp_ws(void) \ 108 { \ 109 struct name##_mp_state *mp_state; \ 110 int res; \ 111 \ 112 res = name##_mp_getstate(&mp_state); \ 113 if (res != 0) \ 114 return (INVALID_CACHED_MP_WRITE_SESSION); \ 115 \ 116 return (mp_state->mp_write_session); \ 117 } \ 118 \ 119 static void \ 120 name##_set_mp_rs(cached_mp_read_session rs) \ 121 { \ 122 struct name##_mp_state *mp_state; \ 123 int res; \ 124 \ 125 res = name##_mp_getstate(&mp_state); \ 126 if (res != 0) \ 127 return; \ 128 \ 129 mp_state->mp_read_session = rs; \ 130 } \ 131 \ 132 static cached_mp_read_session \ 133 name##_get_mp_rs(void) \ 134 { \ 135 struct name##_mp_state *mp_state; \ 136 int res; \ 137 \ 138 res = name##_mp_getstate(&mp_state); \ 139 if (res != 0) \ 140 return (INVALID_CACHED_MP_READ_SESSION); \ 141 \ 142 return (mp_state->mp_read_session); \ 143 } 144 145 /* 146 * These macros should be used to initialize _nss_cache_info structure. For 147 * multipart queries in setXXXent and getXXXent functions mf and uf 148 * (marshal function and unmarshal function) should be both NULL. 149 */ 150 #define NS_COMMON_CACHE_INFO_INITIALIZER(name, mdata, if, mf, uf) \ 151 {#name, mdata, if, mf, uf, NULL, NULL, NULL, NULL} 152 #define NS_MP_CACHE_INFO_INITIALIZER(name, mdata, mf, uf) \ 153 {#name, mdata, NULL, mf, uf, name##_set_mp_ws, name##_get_mp_ws,\ 154 name##_set_mp_rs, name##_get_mp_rs } 155 156 /* 157 * Analog of other XXX_CB macros. Has the pointer to _nss_cache_info 158 * structure as the only argument. 159 */ 160 #define NS_CACHE_CB(cinfo) {NSSRC_CACHE, __nss_cache_handler, (void *)(cinfo) }, 161 162 /* args are: current pointer, current buffer, initial buffer, pointer type */ 163 #define NS_APPLY_OFFSET(cp, cb, ib, p_type) \ 164 if ((cp) != NULL) \ 165 (cp) = (p_type)((char *)(cb) + (size_t)(cp) - (size_t)(ib)) 166 /* 167 * Gets new pointer from the marshalled buffer by uisng initial address 168 * and initial buffer address 169 */ 170 #define NS_GET_NEWP(cp, cb, ib) \ 171 ((char *)(cb) + (size_t)(cp) - (size_t)(ib)) 172 173 typedef struct _nss_cache_data { 174 char *key; 175 size_t key_size; 176 177 nss_cache_info const *info; 178 } nss_cache_data; 179 180 __BEGIN_DECLS 181 /* dummy function, which is needed to make nss_method_lookup happy */ 182 extern int __nss_cache_handler(void *, void *, va_list); 183 184 #ifdef _NS_PRIVATE 185 extern int __nss_common_cache_read(void *, void *, va_list); 186 extern int __nss_common_cache_write(void *, void *, va_list); 187 extern int __nss_common_cache_write_negative(void *); 188 189 extern int __nss_mp_cache_read(void *, void *, va_list); 190 extern int __nss_mp_cache_write(void *, void *, va_list); 191 extern int __nss_mp_cache_write_submit(void *, void *, va_list); 192 extern int __nss_mp_cache_end(void *, void *, va_list); 193 #endif /* _NS_PRIVATE */ 194 195 __END_DECLS 196 197 #endif 198