/*-
* 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.
*/
#ifndef __NSCD_QUERY_H__
#define __NSCD_QUERY_H__
#include "cachelib.h"
#include "config.h"
#include "protocol.h"
struct query_state;
struct configuration;
struct configuration_entry;
typedef int (*query_process_func)(struct query_state *);
typedef void (*query_destroy_func)(struct query_state *);
typedef ssize_t (*query_read_func)(struct query_state *, void *, size_t);
typedef ssize_t (*query_write_func)(struct query_state *, const void *, size_t);
/*
* The query state structure contains the information to process all types of
* requests and to send all types of responses.
*/
struct query_state {
struct timeval creation_time;
struct timeval timeout;
struct comm_element request;
struct comm_element response;
struct configuration_entry *config_entry;
void *mdata;
query_process_func process_func; /* called on each event */
query_destroy_func destroy_func; /* called on destroy */
/*
* By substituting these functions we can opaquely send and received
* very large buffers
*/
query_write_func write_func; /* data write function */
query_read_func read_func; /* data read function */
char *eid_str; /* the user-identifying string (euid_egid_) */
size_t eid_str_length;
uid_t euid; /* euid of the caller, received via getpeereid */
uid_t uid; /* uid of the caller, received via credentials */
gid_t egid; /* egid of the caller, received via getpeereid */
gid_t gid; /* gid of the caller received via credentials */
size_t io_buffer_size;
size_t io_buffer_watermark;
size_t kevent_watermark; /* bytes to be sent/received */
int sockfd; /* the unix socket to read/write */
int kevent_filter; /* EVFILT_READ or EVFILT_WRITE */
int socket_failed; /* set to 1 if the socket doesn't work correctly */
/*
* These fields are used to opaquely proceed sending/receiving of
* the large buffers
*/
char *io_buffer;
char *io_buffer_p;
int io_buffer_filter;
int use_alternate_io;
};
int check_query_eids(struct query_state *);
ssize_t query_io_buffer_read(struct query_state *, void *, size_t);
ssize_t query_io_buffer_write(struct query_state *, const void *, size_t);
ssize_t query_socket_read(struct query_state *, void *, size_t);
ssize_t query_socket_write(struct query_state *, const void *, size_t);
struct query_state *init_query_state(int, size_t, uid_t, gid_t);
void destroy_query_state(struct query_state *);
#endif
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