| Current Path : /usr/src/usr.sbin/nscd/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/usr.sbin/nscd/mp_rs_query.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: release/9.1.0/usr.sbin/nscd/mp_rs_query.c 194104 2009-06-13 13:07:56Z des $");
#include <sys/types.h>
#include <sys/event.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <assert.h>
#include <errno.h>
#include <nsswitch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cachelib.h"
#include "config.h"
#include "debug.h"
#include "log.h"
#include "query.h"
#include "mp_rs_query.h"
#include "mp_ws_query.h"
#include "singletons.h"
static int on_mp_read_session_close_notification(struct query_state *);
static void on_mp_read_session_destroy(struct query_state *);
static int on_mp_read_session_mapper(struct query_state *);
/* int on_mp_read_session_request_read1(struct query_state *); */
static int on_mp_read_session_request_read2(struct query_state *);
static int on_mp_read_session_request_process(struct query_state *);
static int on_mp_read_session_response_write1(struct query_state *);
static int on_mp_read_session_read_request_process(struct query_state *);
static int on_mp_read_session_read_response_write1(struct query_state *);
static int on_mp_read_session_read_response_write2(struct query_state *);
/*
* This function is used as the query_state's destroy_func to make the
* proper cleanup in case of errors.
*/
static void
on_mp_read_session_destroy(struct query_state *qstate)
{
TRACE_IN(on_mp_read_session_destroy);
finalize_comm_element(&qstate->request);
finalize_comm_element(&qstate->response);
if (qstate->mdata != NULL) {
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
close_cache_mp_read_session(
(cache_mp_read_session)qstate->mdata);
configuration_unlock_entry(qstate->config_entry,
CELT_MULTIPART);
}
TRACE_OUT(on_mp_read_session_destroy);
}
/*
* The functions below are used to process multipart read session initiation
* requests.
* - on_mp_read_session_request_read1 and on_mp_read_session_request_read2 read
* the request itself
* - on_mp_read_session_request_process processes it
* - on_mp_read_session_response_write1 sends the response
*/
int
on_mp_read_session_request_read1(struct query_state *qstate)
{
struct cache_mp_read_session_request *c_mp_rs_request;
ssize_t result;
TRACE_IN(on_mp_read_session_request_read1);
if (qstate->kevent_watermark == 0)
qstate->kevent_watermark = sizeof(size_t);
else {
init_comm_element(&qstate->request,
CET_MP_READ_SESSION_REQUEST);
c_mp_rs_request = get_cache_mp_read_session_request(
&qstate->request);
result = qstate->read_func(qstate,
&c_mp_rs_request->entry_length, sizeof(size_t));
if (result != sizeof(size_t)) {
TRACE_OUT(on_mp_read_session_request_read1);
return (-1);
}
if (BUFSIZE_INVALID(c_mp_rs_request->entry_length)) {
TRACE_OUT(on_mp_read_session_request_read1);
return (-1);
}
c_mp_rs_request->entry = calloc(1,
c_mp_rs_request->entry_length + 1);
assert(c_mp_rs_request->entry != NULL);
qstate->kevent_watermark = c_mp_rs_request->entry_length;
qstate->process_func = on_mp_read_session_request_read2;
}
TRACE_OUT(on_mp_read_session_request_read1);
return (0);
}
static int
on_mp_read_session_request_read2(struct query_state *qstate)
{
struct cache_mp_read_session_request *c_mp_rs_request;
ssize_t result;
TRACE_IN(on_mp_read_session_request_read2);
c_mp_rs_request = get_cache_mp_read_session_request(&qstate->request);
result = qstate->read_func(qstate, c_mp_rs_request->entry,
c_mp_rs_request->entry_length);
if (result < 0 || (size_t)result != qstate->kevent_watermark) {
LOG_ERR_3("on_mp_read_session_request_read2",
"read failed");
TRACE_OUT(on_mp_read_session_request_read2);
return (-1);
}
qstate->kevent_watermark = 0;
qstate->process_func = on_mp_read_session_request_process;
TRACE_OUT(on_mp_read_session_request_read2);
return (0);
}
static int
on_mp_read_session_request_process(struct query_state *qstate)
{
struct cache_mp_read_session_request *c_mp_rs_request;
struct cache_mp_read_session_response *c_mp_rs_response;
cache_mp_read_session rs;
cache_entry c_entry;
char *dec_cache_entry_name;
char *buffer;
size_t buffer_size;
cache_mp_write_session ws;
struct agent *lookup_agent;
struct multipart_agent *mp_agent;
void *mdata;
int res;
TRACE_IN(on_mp_read_session_request_process);
init_comm_element(&qstate->response, CET_MP_READ_SESSION_RESPONSE);
c_mp_rs_response = get_cache_mp_read_session_response(
&qstate->response);
c_mp_rs_request = get_cache_mp_read_session_request(&qstate->request);
qstate->config_entry = configuration_find_entry(
s_configuration, c_mp_rs_request->entry);
if (qstate->config_entry == NULL) {
c_mp_rs_response->error_code = ENOENT;
LOG_ERR_2("read_session_request",
"can't find configuration entry '%s'."
" aborting request", c_mp_rs_request->entry);
goto fin;
}
if (qstate->config_entry->enabled == 0) {
c_mp_rs_response->error_code = EACCES;
LOG_ERR_2("read_session_request",
"configuration entry '%s' is disabled",
c_mp_rs_request->entry);
goto fin;
}
if (qstate->config_entry->perform_actual_lookups != 0)
dec_cache_entry_name = strdup(
qstate->config_entry->mp_cache_params.cep.entry_name);
else {
#ifdef NS_NSCD_EID_CHECKING
if (check_query_eids(qstate) != 0) {
c_mp_rs_response->error_code = EPERM;
goto fin;
}
#endif
asprintf(&dec_cache_entry_name, "%s%s", qstate->eid_str,
qstate->config_entry->mp_cache_params.cep.entry_name);
}
assert(dec_cache_entry_name != NULL);
configuration_lock_rdlock(s_configuration);
c_entry = find_cache_entry(s_cache, dec_cache_entry_name);
configuration_unlock(s_configuration);
if ((c_entry == INVALID_CACHE) &&
(qstate->config_entry->perform_actual_lookups != 0))
c_entry = register_new_mp_cache_entry(qstate,
dec_cache_entry_name);
free(dec_cache_entry_name);
if (c_entry != INVALID_CACHE_ENTRY) {
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
rs = open_cache_mp_read_session(c_entry);
configuration_unlock_entry(qstate->config_entry,
CELT_MULTIPART);
if ((rs == INVALID_CACHE_MP_READ_SESSION) &&
(qstate->config_entry->perform_actual_lookups != 0)) {
lookup_agent = find_agent(s_agent_table,
c_mp_rs_request->entry, MULTIPART_AGENT);
if ((lookup_agent != NULL) &&
(lookup_agent->type == MULTIPART_AGENT)) {
mp_agent = (struct multipart_agent *)
lookup_agent;
mdata = mp_agent->mp_init_func();
/*
* Multipart agents read the whole snapshot
* of the data at one time.
*/
configuration_lock_entry(qstate->config_entry,
CELT_MULTIPART);
ws = open_cache_mp_write_session(c_entry);
configuration_unlock_entry(qstate->config_entry,
CELT_MULTIPART);
if (ws != NULL) {
do {
buffer = NULL;
res = mp_agent->mp_lookup_func(&buffer,
&buffer_size,
mdata);
if ((res & NS_TERMINATE) &&
(buffer != NULL)) {
configuration_lock_entry(
qstate->config_entry,
CELT_MULTIPART);
if (cache_mp_write(ws, buffer,
buffer_size) != 0) {
abandon_cache_mp_write_session(ws);
ws = NULL;
}
configuration_unlock_entry(
qstate->config_entry,
CELT_MULTIPART);
free(buffer);
buffer = NULL;
} else {
configuration_lock_entry(
qstate->config_entry,
CELT_MULTIPART);
close_cache_mp_write_session(ws);
configuration_unlock_entry(
qstate->config_entry,
CELT_MULTIPART);
free(buffer);
buffer = NULL;
}
} while ((res & NS_TERMINATE) &&
(ws != NULL));
}
configuration_lock_entry(qstate->config_entry,
CELT_MULTIPART);
rs = open_cache_mp_read_session(c_entry);
configuration_unlock_entry(qstate->config_entry,
CELT_MULTIPART);
}
}
if (rs == INVALID_CACHE_MP_READ_SESSION)
c_mp_rs_response->error_code = -1;
else {
qstate->mdata = rs;
qstate->destroy_func = on_mp_read_session_destroy;
configuration_lock_entry(qstate->config_entry,
CELT_MULTIPART);
if ((qstate->config_entry->mp_query_timeout.tv_sec != 0) ||
(qstate->config_entry->mp_query_timeout.tv_usec != 0))
memcpy(&qstate->timeout,
&qstate->config_entry->mp_query_timeout,
sizeof(struct timeval));
configuration_unlock_entry(qstate->config_entry,
CELT_MULTIPART);
}
} else
c_mp_rs_response->error_code = -1;
fin:
qstate->process_func = on_mp_read_session_response_write1;
qstate->kevent_watermark = sizeof(int);
qstate->kevent_filter = EVFILT_WRITE;
TRACE_OUT(on_mp_read_session_request_process);
return (0);
}
static int
on_mp_read_session_response_write1(struct query_state *qstate)
{
struct cache_mp_read_session_response *c_mp_rs_response;
ssize_t result;
TRACE_IN(on_mp_read_session_response_write1);
c_mp_rs_response = get_cache_mp_read_session_response(
&qstate->response);
result = qstate->write_func(qstate, &c_mp_rs_response->error_code,
sizeof(int));
if (result != sizeof(int)) {
LOG_ERR_3("on_mp_read_session_response_write1",
"write failed");
TRACE_OUT(on_mp_read_session_response_write1);
return (-1);
}
if (c_mp_rs_response->error_code == 0) {
qstate->kevent_watermark = sizeof(int);
qstate->process_func = on_mp_read_session_mapper;
qstate->kevent_filter = EVFILT_READ;
} else {
qstate->kevent_watermark = 0;
qstate->process_func = NULL;
}
TRACE_OUT(on_mp_read_session_response_write1);
return (0);
}
/*
* Mapper function is used to avoid multiple connections for each session
* write or read requests. After processing the request, it does not close
* the connection, but waits for the next request.
*/
static int
on_mp_read_session_mapper(struct query_state *qstate)
{
ssize_t result;
int elem_type;
TRACE_IN(on_mp_read_session_mapper);
if (qstate->kevent_watermark == 0) {
qstate->kevent_watermark = sizeof(int);
} else {
result = qstate->read_func(qstate, &elem_type, sizeof(int));
if (result != sizeof(int)) {
LOG_ERR_3("on_mp_read_session_mapper",
"read failed");
TRACE_OUT(on_mp_read_session_mapper);
return (-1);
}
switch (elem_type) {
case CET_MP_READ_SESSION_READ_REQUEST:
qstate->kevent_watermark = 0;
qstate->process_func =
on_mp_read_session_read_request_process;
break;
case CET_MP_READ_SESSION_CLOSE_NOTIFICATION:
qstate->kevent_watermark = 0;
qstate->process_func =
on_mp_read_session_close_notification;
break;
default:
qstate->kevent_watermark = 0;
qstate->process_func = NULL;
LOG_ERR_3("on_mp_read_session_mapper",
"unknown element type");
TRACE_OUT(on_mp_read_session_mapper);
return (-1);
}
}
TRACE_OUT(on_mp_read_session_mapper);
return (0);
}
/*
* The functions below are used to process multipart read sessions read
* requests. User doesn't have to pass any kind of data, besides the
* request identificator itself. So we don't need any XXX_read functions and
* start with the XXX_process function.
* - on_mp_read_session_read_request_process processes it
* - on_mp_read_session_read_response_write1 and
* on_mp_read_session_read_response_write2 sends the response
*/
static int
on_mp_read_session_read_request_process(struct query_state *qstate)
{
struct cache_mp_read_session_read_response *read_response;
TRACE_IN(on_mp_read_session_response_process);
init_comm_element(&qstate->response, CET_MP_READ_SESSION_READ_RESPONSE);
read_response = get_cache_mp_read_session_read_response(
&qstate->response);
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
read_response->error_code = cache_mp_read(
(cache_mp_read_session)qstate->mdata, NULL,
&read_response->data_size);
if (read_response->error_code == 0) {
read_response->data = malloc(read_response->data_size);
assert(read_response != NULL);
read_response->error_code = cache_mp_read(
(cache_mp_read_session)qstate->mdata,
read_response->data,
&read_response->data_size);
}
configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
if (read_response->error_code == 0)
qstate->kevent_watermark = sizeof(size_t) + sizeof(int);
else
qstate->kevent_watermark = sizeof(int);
qstate->process_func = on_mp_read_session_read_response_write1;
qstate->kevent_filter = EVFILT_WRITE;
TRACE_OUT(on_mp_read_session_response_process);
return (0);
}
static int
on_mp_read_session_read_response_write1(struct query_state *qstate)
{
struct cache_mp_read_session_read_response *read_response;
ssize_t result;
TRACE_IN(on_mp_read_session_read_response_write1);
read_response = get_cache_mp_read_session_read_response(
&qstate->response);
result = qstate->write_func(qstate, &read_response->error_code,
sizeof(int));
if (read_response->error_code == 0) {
result += qstate->write_func(qstate, &read_response->data_size,
sizeof(size_t));
if (result < 0 || (size_t)result != qstate->kevent_watermark) {
TRACE_OUT(on_mp_read_session_read_response_write1);
LOG_ERR_3("on_mp_read_session_read_response_write1",
"write failed");
return (-1);
}
qstate->kevent_watermark = read_response->data_size;
qstate->process_func = on_mp_read_session_read_response_write2;
} else {
if (result < 0 || (size_t)result != qstate->kevent_watermark) {
LOG_ERR_3("on_mp_read_session_read_response_write1",
"write failed");
TRACE_OUT(on_mp_read_session_read_response_write1);
return (-1);
}
qstate->kevent_watermark = 0;
qstate->process_func = NULL;
}
TRACE_OUT(on_mp_read_session_read_response_write1);
return (0);
}
static int
on_mp_read_session_read_response_write2(struct query_state *qstate)
{
struct cache_mp_read_session_read_response *read_response;
ssize_t result;
TRACE_IN(on_mp_read_session_read_response_write2);
read_response = get_cache_mp_read_session_read_response(
&qstate->response);
result = qstate->write_func(qstate, read_response->data,
read_response->data_size);
if (result < 0 || (size_t)result != qstate->kevent_watermark) {
LOG_ERR_3("on_mp_read_session_read_response_write2",
"write failed");
TRACE_OUT(on_mp_read_session_read_response_write2);
return (-1);
}
finalize_comm_element(&qstate->request);
finalize_comm_element(&qstate->response);
qstate->kevent_watermark = sizeof(int);
qstate->process_func = on_mp_read_session_mapper;
qstate->kevent_filter = EVFILT_READ;
TRACE_OUT(on_mp_read_session_read_response_write2);
return (0);
}
/*
* Handles session close notification by calling close_cache_mp_read_session
* function.
*/
static int
on_mp_read_session_close_notification(struct query_state *qstate)
{
TRACE_IN(on_mp_read_session_close_notification);
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
close_cache_mp_read_session((cache_mp_read_session)qstate->mdata);
configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
qstate->mdata = NULL;
qstate->kevent_watermark = 0;
qstate->process_func = NULL;
TRACE_OUT(on_mp_read_session_close_notification);
return (0);
}