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https://github.com/freebsd/freebsd-src
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198 lines
6.6 KiB
C
198 lines
6.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __NS_CACHE_H__
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#define __NS_CACHE_H__
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#include "nscachedcli.h"
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typedef int (*nss_cache_id_func_t)(char *, size_t *, va_list, void *);
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typedef int (*nss_cache_marshal_func_t)(char *, size_t *, void *, va_list,
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void *);
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typedef int (*nss_cache_unmarshal_func_t)(char *, size_t, void *, va_list,
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void *);
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typedef void (*nss_set_mp_ws_func_t)(cached_mp_write_session);
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typedef cached_mp_write_session (*nss_get_mp_ws_func_t)(void);
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typedef void (*nss_set_mp_rs_func_t)(cached_mp_read_session);
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typedef cached_mp_read_session (*nss_get_mp_rs_func_t)(void);
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typedef struct _nss_cache_info {
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char *entry_name;
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void *mdata;
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/*
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* These 3 functions should be implemented specifically for each
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* nsswitch database.
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*/
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nss_cache_id_func_t id_func; /* marshals the request parameters */
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nss_cache_marshal_func_t marshal_func; /* marshals response */
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nss_cache_unmarshal_func_t unmarshal_func; /* unmarshals response */
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/*
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* These 4 functions should be generated with NSS_MP_CACHE_HANDLING
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* macro.
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*/
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nss_set_mp_ws_func_t set_mp_ws_func; /* sets current write session */
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nss_get_mp_ws_func_t get_mp_ws_func; /* gets current write session */
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nss_set_mp_rs_func_t set_mp_rs_func; /* sets current read session */
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nss_get_mp_rs_func_t get_mp_rs_func; /* gets current read session */
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} nss_cache_info;
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/*
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* NSS_MP_CACHE_HANDLING implements the set_mp_ws, get_mp_ws, set_mp_rs,
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* get_mp_rs functions, that are used in _nss_cache_info. It uses
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* NSS_TLS_HANDLING macro to organize thread local storage.
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*/
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#define NSS_MP_CACHE_HANDLING(name) \
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struct name##_mp_state { \
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cached_mp_write_session mp_write_session; \
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cached_mp_read_session mp_read_session; \
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}; \
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\
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static void \
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name##_mp_endstate(void *s) { \
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struct name##_mp_state *mp_state; \
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\
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mp_state = (struct name##_mp_state *)s; \
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if (mp_state->mp_write_session != INVALID_CACHED_MP_WRITE_SESSION)\
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__abandon_cached_mp_write_session(mp_state->mp_write_session);\
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\
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if (mp_state->mp_read_session != INVALID_CACHED_MP_READ_SESSION)\
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__close_cached_mp_read_session(mp_state->mp_read_session);\
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} \
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NSS_TLS_HANDLING(name##_mp); \
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\
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static void \
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name##_set_mp_ws(cached_mp_write_session ws) \
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{ \
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struct name##_mp_state *mp_state; \
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int res; \
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\
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res = name##_mp_getstate(&mp_state); \
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if (res != 0) \
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return; \
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\
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mp_state->mp_write_session = ws; \
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} \
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\
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static cached_mp_write_session \
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name##_get_mp_ws(void) \
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{ \
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struct name##_mp_state *mp_state; \
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int res; \
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\
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res = name##_mp_getstate(&mp_state); \
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if (res != 0) \
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return (INVALID_CACHED_MP_WRITE_SESSION); \
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\
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return (mp_state->mp_write_session); \
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} \
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\
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static void \
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name##_set_mp_rs(cached_mp_read_session rs) \
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{ \
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struct name##_mp_state *mp_state; \
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int res; \
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\
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res = name##_mp_getstate(&mp_state); \
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if (res != 0) \
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return; \
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\
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mp_state->mp_read_session = rs; \
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} \
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\
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static cached_mp_read_session \
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name##_get_mp_rs(void) \
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{ \
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struct name##_mp_state *mp_state; \
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int res; \
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\
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res = name##_mp_getstate(&mp_state); \
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if (res != 0) \
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return (INVALID_CACHED_MP_READ_SESSION); \
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\
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return (mp_state->mp_read_session); \
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}
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/*
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* These macros should be used to initialize _nss_cache_info structure. For
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* multipart queries in setXXXent and getXXXent functions mf and uf
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* (marshal function and unmarshal function) should be both NULL.
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*/
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#define NS_COMMON_CACHE_INFO_INITIALIZER(name, mdata, if, mf, uf) \
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{#name, mdata, if, mf, uf, NULL, NULL, NULL, NULL}
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#define NS_MP_CACHE_INFO_INITIALIZER(name, mdata, mf, uf) \
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{#name, mdata, NULL, mf, uf, name##_set_mp_ws, name##_get_mp_ws,\
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name##_set_mp_rs, name##_get_mp_rs }
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/*
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* Analog of other XXX_CB macros. Has the pointer to _nss_cache_info
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* structure as the only argument.
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*/
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#define NS_CACHE_CB(cinfo) {NSSRC_CACHE, __nss_cache_handler, (void *)(cinfo) },
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/* args are: current pointer, current buffer, initial buffer, pointer type */
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#define NS_APPLY_OFFSET(cp, cb, ib, p_type) \
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if ((cp) != NULL) \
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(cp) = (p_type)((char *)(cb) + (size_t)(cp) - (size_t)(ib))
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/*
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* Gets new pointer from the marshalled buffer by uisng initial address
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* and initial buffer address
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*/
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#define NS_GET_NEWP(cp, cb, ib) \
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((char *)(cb) + (size_t)(cp) - (size_t)(ib))
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typedef struct _nss_cache_data {
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char *key;
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size_t key_size;
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nss_cache_info const *info;
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} nss_cache_data;
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__BEGIN_DECLS
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/* dummy function, which is needed to make nss_method_lookup happy */
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extern int __nss_cache_handler(void *, void *, va_list);
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#ifdef _NS_PRIVATE
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extern int __nss_common_cache_read(void *, void *, va_list);
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extern int __nss_common_cache_write(void *, void *, va_list);
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extern int __nss_common_cache_write_negative(void *);
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extern int __nss_mp_cache_read(void *, void *, va_list);
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extern int __nss_mp_cache_write(void *, void *, va_list);
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extern int __nss_mp_cache_write_submit(void *, void *, va_list);
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extern int __nss_mp_cache_end(void *, void *, va_list);
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#endif /* _NS_PRIVATE */
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__END_DECLS
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#endif
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