usr.sbin/nscd/query.h

   1 /*-
   2  * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/nscd/query.h,v 1.3 2007/09/27 12:30:11 bushman Exp $
  27  */
  28
  29 #ifndef __NSCD_QUERY_H__
  30 #define __NSCD_QUERY_H__
  31
  32 #include <sys/types.h>
  33 #include <stdlib.h>
  34 #include <unistd.h>
  35 #include "cachelib.h"
  36 #include "config.h"
  37 #include "protocol.h"
  38
  39 struct query_state;
  40 struct configuration;
  41 struct configuration_entry;
  42
  43 typedef int (*query_process_func)(struct query_state *);
  44 typedef void (*query_destroy_func)(struct query_state *);
  45 typedef ssize_t (*query_read_func)(struct query_state *, void *, size_t);
  46 typedef ssize_t (*query_write_func)(struct query_state *, const void *, size_t);
  47
  48 /*
  49  * The query state structure contains the information to process all types of
  50  * requests and to send all types of responses.
  51  */
  52 struct query_state {
  53         struct timeval creation_time;
  54         struct timeval timeout;
  55
  56         struct comm_element request;
  57         struct comm_element response;
  58         struct configuration_entry *config_entry;
  59         void    *mdata;
  60
  61         query_process_func process_func;        /* called on each event */
  62         query_destroy_func destroy_func;        /* called on destroy */
  63
  64         /*
  65          * By substituting these functions we can opaquely send and received
  66          * very large buffers
  67          */
  68         query_write_func write_func;            /* data write function */
  69         query_read_func read_func;              /* data read function */
  70
  71         char    *eid_str;       /* the user-identifying string (euid_egid_) */
  72         size_t  eid_str_length;
  73
  74         uid_t   euid;   /* euid of the caller, received via getpeereid */
  75         uid_t   uid;    /* uid of the caller, received via credentials */
  76         gid_t   egid;   /* egid of the caller, received via getpeereid */
  77         gid_t   gid;    /* gid of the caller received via credentials */
  78
  79         size_t  io_buffer_size;
  80         size_t  io_buffer_watermark;
  81         size_t  kevent_watermark;       /* bytes to be sent/received */
  82         int     sockfd;                 /* the unix socket to read/write */
  83         int     kevent_filter;  /* EVFILT_READ or EVFILT_WRITE */
  84         int socket_failed; /* set to 1 if the socket doesn't work correctly */
  85
  86         /*
  87          * These fields are used to opaquely proceed sending/receiving of
  88          * the large buffers
  89          */
  90         char    *io_buffer;
  91         char    *io_buffer_p;
  92         int     io_buffer_filter;
  93         int     use_alternate_io;
  94 };
  95
  96 extern int check_query_eids(struct query_state *);
  97
  98 extern ssize_t query_io_buffer_read(struct query_state *, void *, size_t);
  99 extern ssize_t query_io_buffer_write(struct query_state *, const void *,
 100         size_t);
 101
 102 extern ssize_t query_socket_read(struct query_state *, void *, size_t);
 103 extern ssize_t query_socket_write(struct query_state *, const void *, size_t);
 104
 105 extern struct query_state *init_query_state(int, size_t, uid_t, gid_t);
 106 extern void destroy_query_state(struct query_state *);
 107
 108 #endif