mdw@git.distorted.org.uk Git - fwd/blob - bres.h

   1 /* -*-c-*-
   2  *
   3  * $Id: bres.h,v 1.2 1999/07/26 23:27:22 mdw Exp $
   4  *
   5  * Background reverse name resolution
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of the `fw' port forwarder.
  13  *
  14  * `fw' is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * `fw' is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with `fw'; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  */
  28
  29 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: bres.h,v $
  32  * Revision 1.2  1999/07/26 23:27:22  mdw
  33  * Change copyright notice.
  34  *
  35  * Revision 1.1.1.1  1999/07/01 08:56:23  mdw
  36  * Initial revision.
  37  *
  38  */
  39
  40 #ifndef RES_H
  41 #define RES_H
  42
  43 #ifdef __cplusplus
  44   extern "C" {
  45 #endif
  46
  47 /*----- Header files ------------------------------------------------------*/
  48
  49 #include <sys/types.h>
  50
  51 #include <sys/socket.h>
  52 #include <netinet/in.h>
  53 #include <arpa/inet.h>
  54
  55 #include <mLib/sel.h>
  56 #include <mLib/selbuf.h>
  57
  58 /*----- Data structures ---------------------------------------------------*/
  59
  60 /* --- Client allocated request block --- */
  61
  62 typedef struct bres_client {
  63   struct bres_client *next, *prev;      /* Queue of waiting resolve jobs */
  64   struct bres_server *rs;               /* Pointer to attached server */
  65   struct in_addr addr;                  /* Address to be resolved */
  66   void (*func)(const char */*host*/, void */*p*/); /* Handler function */
  67   void *p;                              /* Argument for handler function */
  68 } bres_client;
  69
  70 /* --- Server maintained resolver blocks --- */
  71
  72 typedef struct bres_server {
  73   struct bres_server *next, *prev;      /* Doubly-linked list of servers */
  74   pid_t kid;                            /* Process id of server process */
  75   selbuf b;                             /* Input line-buffer selector */
  76   sel_timer t;                          /* Timeout for idle servers */
  77   int fd;                               /* File descriptor for writing */
  78   struct bres_client *rc;               /* Pointer to attached client */
  79 } bres_server;
  80
  81 /*----- Functions provided ------------------------------------------------*/
  82
  83 /* --- @bres_abort@ --- *
  84  *
  85  * Arguments:   @bres_client *rc@ = pointer to client block
  86  *
  87  * Returns:     ---
  88  *
  89  * Use:         Removes a queued job.
  90  */
  91
  92 extern void bres_abort(bres_client */*rc*/);
  93
  94 /* --- @bres_resolve@ --- *
  95  *
  96  * Arguments:   @bres_client *rc@ = pointer to client block
  97  *              @struct in_addr addr@ = address to resolve
  98  *              @void (*func)(const char *host, void *p)@ = handler function
  99  *              @void *p@ = argument for handler function
 100  *
 101  * Returns:     ---
 102  *
 103  * Use:         Adds a resolver job to the queue.  The job will be processed
 104  *              when there's a spare resolver process to deal with it.
 105  */
 106
 107 extern void bres_resolve(bres_client */*rc*/, struct in_addr /*addr*/,
 108                         void (*/*func*/)(const char */*host*/, void */*p*/),
 109                         void */*p*/);
 110
 111 /* --- @bres_init@ --- *
 112  *
 113  * Arguments:   @sel_state *s@ = pointer to select multiplexor
 114  *
 115  * Returns:     ---
 116  *
 117  * Use:         Initializes the background resolver for use.
 118  */
 119
 120 extern void bres_init(sel_state */*s*/);
 121
 122 /*----- That's all, folks -------------------------------------------------*/
 123
 124 #ifdef __cplusplus
 125   }
 126 #endif
 127
 128 #endif