547 lines
17 KiB
C
547 lines
17 KiB
C
/*-
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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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "cachelib.h"
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#include "config.h"
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#include "debug.h"
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#include "log.h"
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#include "query.h"
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#include "mp_ws_query.h"
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#include "singletons.h"
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static int on_mp_write_session_abandon_notification(struct query_state *);
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static int on_mp_write_session_close_notification(struct query_state *);
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static void on_mp_write_session_destroy(struct query_state *);
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static int on_mp_write_session_mapper(struct query_state *);
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/* int on_mp_write_session_request_read1(struct query_state *); */
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static int on_mp_write_session_request_read2(struct query_state *);
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static int on_mp_write_session_request_process(struct query_state *);
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static int on_mp_write_session_response_write1(struct query_state *);
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static int on_mp_write_session_write_request_read1(struct query_state *);
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static int on_mp_write_session_write_request_read2(struct query_state *);
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static int on_mp_write_session_write_request_process(struct query_state *);
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static int on_mp_write_session_write_response_write1(struct query_state *);
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/*
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* This function is used as the query_state's destroy_func to make the
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* proper cleanup in case of errors.
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*/
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static void
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on_mp_write_session_destroy(struct query_state *qstate)
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{
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TRACE_IN(on_mp_write_session_destroy);
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finalize_comm_element(&qstate->request);
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finalize_comm_element(&qstate->response);
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if (qstate->mdata != NULL) {
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configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
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abandon_cache_mp_write_session(
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(cache_mp_write_session)qstate->mdata);
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configuration_unlock_entry(qstate->config_entry,
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CELT_MULTIPART);
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}
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TRACE_OUT(on_mp_write_session_destroy);
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}
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/*
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* The functions below are used to process multipart write session initiation
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* requests.
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* - on_mp_write_session_request_read1 and on_mp_write_session_request_read2
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* read the request itself
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* - on_mp_write_session_request_process processes it
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* - on_mp_write_session_response_write1 sends the response
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*/
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int
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on_mp_write_session_request_read1(struct query_state *qstate)
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{
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struct cache_mp_write_session_request *c_mp_ws_request;
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ssize_t result;
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TRACE_IN(on_mp_write_session_request_read1);
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if (qstate->kevent_watermark == 0)
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qstate->kevent_watermark = sizeof(size_t);
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else {
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init_comm_element(&qstate->request,
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CET_MP_WRITE_SESSION_REQUEST);
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c_mp_ws_request = get_cache_mp_write_session_request(
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&qstate->request);
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result = qstate->read_func(qstate,
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&c_mp_ws_request->entry_length, sizeof(size_t));
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if (result != sizeof(size_t)) {
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LOG_ERR_3("on_mp_write_session_request_read1",
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"read failed");
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TRACE_OUT(on_mp_write_session_request_read1);
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return (-1);
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}
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if (BUFSIZE_INVALID(c_mp_ws_request->entry_length)) {
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LOG_ERR_3("on_mp_write_session_request_read1",
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"invalid entry_length value");
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TRACE_OUT(on_mp_write_session_request_read1);
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return (-1);
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}
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c_mp_ws_request->entry = (char *)calloc(1,
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c_mp_ws_request->entry_length + 1);
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assert(c_mp_ws_request->entry != NULL);
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qstate->kevent_watermark = c_mp_ws_request->entry_length;
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qstate->process_func = on_mp_write_session_request_read2;
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}
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TRACE_OUT(on_mp_write_session_request_read1);
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return (0);
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}
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static int
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on_mp_write_session_request_read2(struct query_state *qstate)
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{
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struct cache_mp_write_session_request *c_mp_ws_request;
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ssize_t result;
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TRACE_IN(on_mp_write_session_request_read2);
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c_mp_ws_request = get_cache_mp_write_session_request(&qstate->request);
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result = qstate->read_func(qstate, c_mp_ws_request->entry,
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c_mp_ws_request->entry_length);
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if (result < 0 || (size_t)result != qstate->kevent_watermark) {
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LOG_ERR_3("on_mp_write_session_request_read2",
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"read failed");
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TRACE_OUT(on_mp_write_session_request_read2);
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return (-1);
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}
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qstate->kevent_watermark = 0;
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qstate->process_func = on_mp_write_session_request_process;
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TRACE_OUT(on_mp_write_session_request_read2);
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return (0);
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}
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static int
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on_mp_write_session_request_process(struct query_state *qstate)
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{
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struct cache_mp_write_session_request *c_mp_ws_request;
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struct cache_mp_write_session_response *c_mp_ws_response;
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cache_mp_write_session ws;
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cache_entry c_entry;
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char *dec_cache_entry_name;
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TRACE_IN(on_mp_write_session_request_process);
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init_comm_element(&qstate->response, CET_MP_WRITE_SESSION_RESPONSE);
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c_mp_ws_response = get_cache_mp_write_session_response(
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&qstate->response);
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c_mp_ws_request = get_cache_mp_write_session_request(&qstate->request);
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qstate->config_entry = configuration_find_entry(
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s_configuration, c_mp_ws_request->entry);
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if (qstate->config_entry == NULL) {
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c_mp_ws_response->error_code = ENOENT;
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LOG_ERR_2("write_session_request",
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"can't find configuration entry '%s'. "
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"aborting request", c_mp_ws_request->entry);
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goto fin;
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}
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if (qstate->config_entry->enabled == 0) {
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c_mp_ws_response->error_code = EACCES;
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LOG_ERR_2("write_session_request",
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"configuration entry '%s' is disabled",
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c_mp_ws_request->entry);
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goto fin;
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}
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if (qstate->config_entry->perform_actual_lookups != 0) {
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c_mp_ws_response->error_code = EOPNOTSUPP;
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LOG_ERR_2("write_session_request",
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"entry '%s' performs lookups by itself: "
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"can't write to it", c_mp_ws_request->entry);
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goto fin;
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} else {
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#ifdef NS_NSCD_EID_CHECKING
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if (check_query_eids(qstate) != 0) {
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c_mp_ws_response->error_code = EPERM;
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goto fin;
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}
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#endif
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}
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/*
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* All multipart entries are separated by their name decorations.
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* For one configuration entry there will be a lot of multipart
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* cache entries - each with its own decorated name.
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*/
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asprintf(&dec_cache_entry_name, "%s%s", qstate->eid_str,
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qstate->config_entry->mp_cache_params.entry_name);
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assert(dec_cache_entry_name != NULL);
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configuration_lock_rdlock(s_configuration);
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c_entry = find_cache_entry(s_cache,
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dec_cache_entry_name);
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configuration_unlock(s_configuration);
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if (c_entry == INVALID_CACHE_ENTRY)
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c_entry = register_new_mp_cache_entry(qstate,
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dec_cache_entry_name);
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free(dec_cache_entry_name);
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assert(c_entry != NULL);
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configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
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ws = open_cache_mp_write_session(c_entry);
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if (ws == INVALID_CACHE_MP_WRITE_SESSION)
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c_mp_ws_response->error_code = -1;
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else {
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qstate->mdata = ws;
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qstate->destroy_func = on_mp_write_session_destroy;
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if ((qstate->config_entry->mp_query_timeout.tv_sec != 0) ||
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(qstate->config_entry->mp_query_timeout.tv_usec != 0))
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memcpy(&qstate->timeout,
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&qstate->config_entry->mp_query_timeout,
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sizeof(struct timeval));
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}
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configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
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fin:
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qstate->process_func = on_mp_write_session_response_write1;
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qstate->kevent_watermark = sizeof(int);
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qstate->kevent_filter = EVFILT_WRITE;
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TRACE_OUT(on_mp_write_session_request_process);
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return (0);
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}
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static int
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on_mp_write_session_response_write1(struct query_state *qstate)
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{
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struct cache_mp_write_session_response *c_mp_ws_response;
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ssize_t result;
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TRACE_IN(on_mp_write_session_response_write1);
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c_mp_ws_response = get_cache_mp_write_session_response(
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&qstate->response);
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result = qstate->write_func(qstate, &c_mp_ws_response->error_code,
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sizeof(int));
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if (result != sizeof(int)) {
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LOG_ERR_3("on_mp_write_session_response_write1",
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"write failed");
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TRACE_OUT(on_mp_write_session_response_write1);
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return (-1);
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}
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if (c_mp_ws_response->error_code == 0) {
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qstate->kevent_watermark = sizeof(int);
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qstate->process_func = on_mp_write_session_mapper;
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qstate->kevent_filter = EVFILT_READ;
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} else {
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qstate->kevent_watermark = 0;
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qstate->process_func = NULL;
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}
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TRACE_OUT(on_mp_write_session_response_write1);
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return (0);
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}
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/*
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* Mapper function is used to avoid multiple connections for each session
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* write or read requests. After processing the request, it does not close
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* the connection, but waits for the next request.
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*/
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static int
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on_mp_write_session_mapper(struct query_state *qstate)
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{
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ssize_t result;
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int elem_type;
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TRACE_IN(on_mp_write_session_mapper);
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if (qstate->kevent_watermark == 0) {
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qstate->kevent_watermark = sizeof(int);
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} else {
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result = qstate->read_func(qstate, &elem_type, sizeof(int));
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if (result != sizeof(int)) {
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LOG_ERR_3("on_mp_write_session_mapper",
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"read failed");
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TRACE_OUT(on_mp_write_session_mapper);
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return (-1);
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}
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switch (elem_type) {
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case CET_MP_WRITE_SESSION_WRITE_REQUEST:
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qstate->kevent_watermark = sizeof(size_t);
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qstate->process_func =
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on_mp_write_session_write_request_read1;
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break;
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case CET_MP_WRITE_SESSION_ABANDON_NOTIFICATION:
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qstate->kevent_watermark = 0;
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qstate->process_func =
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on_mp_write_session_abandon_notification;
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break;
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case CET_MP_WRITE_SESSION_CLOSE_NOTIFICATION:
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qstate->kevent_watermark = 0;
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qstate->process_func =
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on_mp_write_session_close_notification;
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break;
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default:
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qstate->kevent_watermark = 0;
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qstate->process_func = NULL;
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LOG_ERR_2("on_mp_write_session_mapper",
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"unknown element type");
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TRACE_OUT(on_mp_write_session_mapper);
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return (-1);
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}
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}
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TRACE_OUT(on_mp_write_session_mapper);
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return (0);
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}
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/*
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* The functions below are used to process multipart write sessions write
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* requests.
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* - on_mp_write_session_write_request_read1 and
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* on_mp_write_session_write_request_read2 read the request itself
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* - on_mp_write_session_write_request_process processes it
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* - on_mp_write_session_write_response_write1 sends the response
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*/
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static int
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on_mp_write_session_write_request_read1(struct query_state *qstate)
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{
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struct cache_mp_write_session_write_request *write_request;
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ssize_t result;
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TRACE_IN(on_mp_write_session_write_request_read1);
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init_comm_element(&qstate->request,
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CET_MP_WRITE_SESSION_WRITE_REQUEST);
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write_request = get_cache_mp_write_session_write_request(
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&qstate->request);
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result = qstate->read_func(qstate, &write_request->data_size,
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sizeof(size_t));
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if (result != sizeof(size_t)) {
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LOG_ERR_3("on_mp_write_session_write_request_read1",
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"read failed");
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TRACE_OUT(on_mp_write_session_write_request_read1);
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return (-1);
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}
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if (BUFSIZE_INVALID(write_request->data_size)) {
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LOG_ERR_3("on_mp_write_session_write_request_read1",
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"invalid data_size value");
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TRACE_OUT(on_mp_write_session_write_request_read1);
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return (-1);
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}
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write_request->data = (char *)calloc(1, write_request->data_size);
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assert(write_request->data != NULL);
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qstate->kevent_watermark = write_request->data_size;
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qstate->process_func = on_mp_write_session_write_request_read2;
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TRACE_OUT(on_mp_write_session_write_request_read1);
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return (0);
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}
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static int
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on_mp_write_session_write_request_read2(struct query_state *qstate)
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{
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struct cache_mp_write_session_write_request *write_request;
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ssize_t result;
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TRACE_IN(on_mp_write_session_write_request_read2);
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write_request = get_cache_mp_write_session_write_request(
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&qstate->request);
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result = qstate->read_func(qstate, write_request->data,
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write_request->data_size);
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if (result < 0 || (size_t)result != qstate->kevent_watermark) {
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LOG_ERR_3("on_mp_write_session_write_request_read2",
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"read failed");
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TRACE_OUT(on_mp_write_session_write_request_read2);
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return (-1);
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}
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qstate->kevent_watermark = 0;
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qstate->process_func = on_mp_write_session_write_request_process;
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TRACE_OUT(on_mp_write_session_write_request_read2);
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return (0);
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}
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static int
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on_mp_write_session_write_request_process(struct query_state *qstate)
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{
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struct cache_mp_write_session_write_request *write_request;
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struct cache_mp_write_session_write_response *write_response;
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TRACE_IN(on_mp_write_session_write_request_process);
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init_comm_element(&qstate->response,
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CET_MP_WRITE_SESSION_WRITE_RESPONSE);
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write_response = get_cache_mp_write_session_write_response(
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&qstate->response);
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write_request = get_cache_mp_write_session_write_request(
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&qstate->request);
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configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
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write_response->error_code = cache_mp_write(
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(cache_mp_write_session)qstate->mdata,
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write_request->data,
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write_request->data_size);
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configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
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qstate->kevent_watermark = sizeof(int);
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qstate->process_func = on_mp_write_session_write_response_write1;
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qstate->kevent_filter = EVFILT_WRITE;
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TRACE_OUT(on_mp_write_session_write_request_process);
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return (0);
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}
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static int
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on_mp_write_session_write_response_write1(struct query_state *qstate)
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{
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struct cache_mp_write_session_write_response *write_response;
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ssize_t result;
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TRACE_IN(on_mp_write_session_write_response_write1);
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write_response = get_cache_mp_write_session_write_response(
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&qstate->response);
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result = qstate->write_func(qstate, &write_response->error_code,
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sizeof(int));
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if (result != sizeof(int)) {
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LOG_ERR_3("on_mp_write_session_write_response_write1",
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"write failed");
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TRACE_OUT(on_mp_write_session_write_response_write1);
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return (-1);
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}
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if (write_response->error_code == 0) {
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finalize_comm_element(&qstate->request);
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finalize_comm_element(&qstate->response);
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qstate->kevent_watermark = sizeof(int);
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qstate->process_func = on_mp_write_session_mapper;
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qstate->kevent_filter = EVFILT_READ;
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} else {
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qstate->kevent_watermark = 0;
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qstate->process_func = 0;
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}
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|
|
|
TRACE_OUT(on_mp_write_session_write_response_write1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Handles abandon notifications. Destroys the session by calling the
|
|
* abandon_cache_mp_write_session.
|
|
*/
|
|
static int
|
|
on_mp_write_session_abandon_notification(struct query_state *qstate)
|
|
{
|
|
TRACE_IN(on_mp_write_session_abandon_notification);
|
|
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
abandon_cache_mp_write_session((cache_mp_write_session)qstate->mdata);
|
|
configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
qstate->mdata = INVALID_CACHE_MP_WRITE_SESSION;
|
|
|
|
qstate->kevent_watermark = 0;
|
|
qstate->process_func = NULL;
|
|
TRACE_OUT(on_mp_write_session_abandon_notification);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Handles close notifications. Commits the session by calling
|
|
* the close_cache_mp_write_session.
|
|
*/
|
|
static int
|
|
on_mp_write_session_close_notification(struct query_state *qstate)
|
|
{
|
|
TRACE_IN(on_mp_write_session_close_notification);
|
|
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
close_cache_mp_write_session((cache_mp_write_session)qstate->mdata);
|
|
configuration_unlock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
qstate->mdata = INVALID_CACHE_MP_WRITE_SESSION;
|
|
|
|
qstate->kevent_watermark = 0;
|
|
qstate->process_func = NULL;
|
|
TRACE_OUT(on_mp_write_session_close_notification);
|
|
return (0);
|
|
}
|
|
|
|
cache_entry register_new_mp_cache_entry(struct query_state *qstate,
|
|
const char *dec_cache_entry_name)
|
|
{
|
|
cache_entry c_entry;
|
|
char *en_bkp;
|
|
|
|
TRACE_IN(register_new_mp_cache_entry);
|
|
c_entry = INVALID_CACHE_ENTRY;
|
|
configuration_lock_entry(qstate->config_entry, CELT_MULTIPART);
|
|
|
|
configuration_lock_wrlock(s_configuration);
|
|
en_bkp = qstate->config_entry->mp_cache_params.entry_name;
|
|
qstate->config_entry->mp_cache_params.entry_name =
|
|
(char *)dec_cache_entry_name;
|
|
register_cache_entry(s_cache, (struct cache_entry_params *)
|
|
&qstate->config_entry->mp_cache_params);
|
|
qstate->config_entry->mp_cache_params.entry_name = en_bkp;
|
|
configuration_unlock(s_configuration);
|
|
|
|
configuration_lock_rdlock(s_configuration);
|
|
c_entry = find_cache_entry(s_cache,
|
|
dec_cache_entry_name);
|
|
configuration_unlock(s_configuration);
|
|
|
|
configuration_entry_add_mp_cache_entry(qstate->config_entry,
|
|
c_entry);
|
|
|
|
configuration_unlock_entry(qstate->config_entry,
|
|
CELT_MULTIPART);
|
|
|
|
TRACE_OUT(register_new_mp_cache_entry);
|
|
return (c_entry);
|
|
}
|