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freebsd-skq/lib/libc/net/nscache.c
pfg 9014a6e40c libc: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-25 17:12:48 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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"
#define _NS_PRIVATE
#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/nscd"
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);
}
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