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