freebsd-dev/lib/libc/net/nscache.c
Hajimu UMEMOTO 06a99fe36f - Extend the nsswitch to support Services, Protocols and Rpc
databases.
- Make nsswitch support caching.

Submitted by:	Michael Bushkov <bushman__at__rsu.ru>
Sponsored by:	Google Summer of Code 2005
2006-04-28 12:03:38 +00:00

439 lines
11 KiB
C

/*-
* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <nsswitch.h>
#include <stdlib.h>
#include <string.h>
#include "un-namespace.h"
#include "nscachedcli.h"
#include "nscache.h"
#define NSS_CACHE_KEY_INITIAL_SIZE (256)
#define NSS_CACHE_KEY_SIZE_LIMIT (NSS_CACHE_KEY_INITIAL_SIZE << 4)
#define NSS_CACHE_BUFFER_INITIAL_SIZE (1024)
#define NSS_CACHE_BUFFER_SIZE_LIMIT (NSS_CACHE_BUFFER_INITIAL_SIZE << 8)
#define CACHED_SOCKET_PATH "/var/run/cached"
int
__nss_cache_handler(void *retval, void *mdata, va_list ap)
{
return (NS_UNAVAIL);
}
int
__nss_common_cache_read(void *retval, void *mdata, va_list ap)
{
struct cached_connection_params params;
cached_connection connection;
char *buffer;
size_t buffer_size, size;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
va_list ap_new;
int res;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
memset(&params, 0, sizeof(struct cached_connection_params));
params.socket_path = CACHED_SOCKET_PATH;
cache_data->key = (char *)malloc(NSS_CACHE_KEY_INITIAL_SIZE);
memset(cache_data->key, 0, NSS_CACHE_KEY_INITIAL_SIZE);
cache_data->key_size = NSS_CACHE_KEY_INITIAL_SIZE;
va_copy(ap_new, ap);
do {
size = cache_data->key_size;
res = cache_info->id_func(cache_data->key, &size, ap_new,
cache_info->mdata);
va_end(ap_new);
if (res == NS_RETURN) {
if (cache_data->key_size > NSS_CACHE_KEY_SIZE_LIMIT)
break;
cache_data->key_size <<= 1;
cache_data->key = realloc(cache_data->key,
cache_data->key_size);
memset(cache_data->key, 0, cache_data->key_size);
va_copy(ap_new, ap);
}
} while (res == NS_RETURN);
if (res != NS_SUCCESS) {
free(cache_data->key);
cache_data->key = NULL;
cache_data->key_size = 0;
return (res);
} else
cache_data->key_size = size;
buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
do {
connection = __open_cached_connection(&params);
if (connection == NULL) {
res = -1;
break;
}
res = __cached_read(connection, cache_info->entry_name,
cache_data->key, cache_data->key_size, buffer,
&buffer_size);
__close_cached_connection(connection);
if (res == -2 && buffer_size < NSS_CACHE_BUFFER_SIZE_LIMIT) {
buffer = (char *)realloc(buffer, buffer_size);
memset(buffer, 0, buffer_size);
}
} while (res == -2);
if (res == 0) {
if (buffer_size == 0) {
free(buffer);
free(cache_data->key);
cache_data->key = NULL;
cache_data->key_size = 0;
return (NS_RETURN);
}
va_copy(ap_new, ap);
res = cache_info->unmarshal_func(buffer, buffer_size, retval,
ap_new, cache_info->mdata);
va_end(ap_new);
if (res != NS_SUCCESS) {
free(buffer);
free(cache_data->key);
cache_data->key = NULL;
cache_data->key_size = 0;
return (res);
} else
res = 0;
}
if (res == 0) {
free(cache_data->key);
cache_data->key = NULL;
cache_data->key_size = 0;
}
free(buffer);
return (res == 0 ? NS_SUCCESS : NS_NOTFOUND);
}
int
__nss_common_cache_write(void *retval, void *mdata, va_list ap)
{
struct cached_connection_params params;
cached_connection connection;
char *buffer;
size_t buffer_size;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
va_list ap_new;
int res;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
if (cache_data->key == NULL)
return (NS_UNAVAIL);
memset(&params, 0, sizeof(struct cached_connection_params));
params.socket_path = CACHED_SOCKET_PATH;
connection = __open_cached_connection(&params);
if (connection == NULL) {
free(cache_data->key);
return (NS_UNAVAIL);
}
buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
do {
size_t size;
size = buffer_size;
va_copy(ap_new, ap);
res = cache_info->marshal_func(buffer, &size, retval, ap_new,
cache_info->mdata);
va_end(ap_new);
if (res == NS_RETURN) {
if (buffer_size > NSS_CACHE_BUFFER_SIZE_LIMIT)
break;
buffer_size <<= 1;
buffer = (char *)realloc(buffer, buffer_size);
memset(buffer, 0, buffer_size);
}
} while (res == NS_RETURN);
if (res != NS_SUCCESS) {
__close_cached_connection(connection);
free(cache_data->key);
free(buffer);
return (res);
}
res = __cached_write(connection, cache_info->entry_name,
cache_data->key, cache_data->key_size, buffer, buffer_size);
__close_cached_connection(connection);
free(cache_data->key);
free(buffer);
return (res == 0 ? NS_SUCCESS : NS_UNAVAIL);
}
int
__nss_common_cache_write_negative(void *mdata)
{
struct cached_connection_params params;
cached_connection connection;
int res;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
if (cache_data->key == NULL)
return (NS_UNAVAIL);
memset(&params, 0, sizeof(struct cached_connection_params));
params.socket_path = CACHED_SOCKET_PATH;
connection = __open_cached_connection(&params);
if (connection == NULL) {
free(cache_data->key);
return (NS_UNAVAIL);
}
res = __cached_write(connection, cache_info->entry_name,
cache_data->key, cache_data->key_size, NULL, 0);
__close_cached_connection(connection);
free(cache_data->key);
return (res == 0 ? NS_SUCCESS : NS_UNAVAIL);
}
int
__nss_mp_cache_read(void *retval, void *mdata, va_list ap)
{
struct cached_connection_params params;
cached_mp_read_session rs;
char *buffer;
size_t buffer_size;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
va_list ap_new;
int res;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
if (cache_info->get_mp_ws_func() != INVALID_CACHED_MP_WRITE_SESSION)
return (NS_UNAVAIL);
rs = cache_info->get_mp_rs_func();
if (rs == INVALID_CACHED_MP_READ_SESSION) {
memset(&params, 0, sizeof(struct cached_connection_params));
params.socket_path = CACHED_SOCKET_PATH;
rs = __open_cached_mp_read_session(&params,
cache_info->entry_name);
if (rs == INVALID_CACHED_MP_READ_SESSION)
return (NS_UNAVAIL);
cache_info->set_mp_rs_func(rs);
}
buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
do {
res = __cached_mp_read(rs, buffer, &buffer_size);
if (res == -2 && buffer_size < NSS_CACHE_BUFFER_SIZE_LIMIT) {
buffer = (char *)realloc(buffer, buffer_size);
memset(buffer, 0, buffer_size);
}
} while (res == -2);
if (res == 0) {
va_copy(ap_new, ap);
res = cache_info->unmarshal_func(buffer, buffer_size, retval,
ap_new, cache_info->mdata);
va_end(ap_new);
if (res != NS_SUCCESS) {
free(buffer);
return (res);
} else
res = 0;
} else {
free(buffer);
__close_cached_mp_read_session(rs);
rs = INVALID_CACHED_MP_READ_SESSION;
cache_info->set_mp_rs_func(rs);
return (res == -1 ? NS_RETURN : NS_UNAVAIL);
}
free(buffer);
return (res == 0 ? NS_SUCCESS : NS_NOTFOUND);
}
int
__nss_mp_cache_write(void *retval, void *mdata, va_list ap)
{
struct cached_connection_params params;
cached_mp_write_session ws;
char *buffer;
size_t buffer_size;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
va_list ap_new;
int res;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
ws = cache_info->get_mp_ws_func();
if (ws == INVALID_CACHED_MP_WRITE_SESSION) {
memset(&params, 0, sizeof(struct cached_connection_params));
params.socket_path = CACHED_SOCKET_PATH;
ws = __open_cached_mp_write_session(&params,
cache_info->entry_name);
if (ws == INVALID_CACHED_MP_WRITE_SESSION)
return (NS_UNAVAIL);
cache_info->set_mp_ws_func(ws);
}
buffer_size = NSS_CACHE_BUFFER_INITIAL_SIZE;
buffer = (char *)malloc(NSS_CACHE_BUFFER_INITIAL_SIZE);
memset(buffer, 0, NSS_CACHE_BUFFER_INITIAL_SIZE);
do {
size_t size;
size = buffer_size;
va_copy(ap_new, ap);
res = cache_info->marshal_func(buffer, &size, retval, ap_new,
cache_info->mdata);
va_end(ap_new);
if (res == NS_RETURN) {
if (buffer_size > NSS_CACHE_BUFFER_SIZE_LIMIT)
break;
buffer_size <<= 1;
buffer = (char *)realloc(buffer, buffer_size);
memset(buffer, 0, buffer_size);
}
} while (res == NS_RETURN);
if (res != NS_SUCCESS) {
free(buffer);
return (res);
}
res = __cached_mp_write(ws, buffer, buffer_size);
free(buffer);
return (res == 0 ? NS_SUCCESS : NS_UNAVAIL);
}
int
__nss_mp_cache_write_submit(void *retval, void *mdata, va_list ap)
{
cached_mp_write_session ws;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
ws = cache_info->get_mp_ws_func();
if (ws != INVALID_CACHED_MP_WRITE_SESSION) {
__close_cached_mp_write_session(ws);
ws = INVALID_CACHED_MP_WRITE_SESSION;
cache_info->set_mp_ws_func(ws);
}
return (NS_UNAVAIL);
}
int
__nss_mp_cache_end(void *retval, void *mdata, va_list ap)
{
cached_mp_write_session ws;
cached_mp_read_session rs;
nss_cache_info const *cache_info;
nss_cache_data *cache_data;
cache_data = (nss_cache_data *)mdata;
cache_info = cache_data->info;
ws = cache_info->get_mp_ws_func();
if (ws != INVALID_CACHED_MP_WRITE_SESSION) {
__abandon_cached_mp_write_session(ws);
ws = INVALID_CACHED_MP_WRITE_SESSION;
cache_info->set_mp_ws_func(ws);
}
rs = cache_info->get_mp_rs_func();
if (rs != INVALID_CACHED_MP_READ_SESSION) {
__close_cached_mp_read_session(rs);
rs = INVALID_CACHED_MP_READ_SESSION;
cache_info->set_mp_rs_func(rs);
}
return (NS_UNAVAIL);
}