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

   1 /* -*-c-*-
   2  *
   3  * $Id: target.h,v 1.4 2004/04/08 01:36:25 mdw Exp $
   4  *
   5  * Description of forwarding targets
   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 #ifndef TARGET_H
  30 #define TARGET_H
  31
  32 #ifdef __cplusplus
  33   extern "C" {
  34 #endif
  35
  36 /*----- Header files ------------------------------------------------------*/
  37
  38 #include <stdio.h>
  39
  40 #ifndef ENDPT_H
  41 #  include "endpt.h"
  42 #endif
  43
  44 #ifndef SCAN_H
  45 #  include "scan.h"
  46 #endif
  47
  48 /*----- Data structures ---------------------------------------------------*/
  49
  50 /* --- A basic target object --- */
  51
  52 typedef struct target {
  53   struct target_ops *ops;
  54   char *desc;
  55 } target;
  56
  57 /* --- Forwarding target operations --- */
  58
  59 typedef struct target_ops {
  60   const char *name;                     /* Name of this target */
  61
  62   /* --- @option@ --- *
  63    *
  64    * Arguments: @target *t@ = pointer to target object, or zero if global
  65    *            @scanner *sc@ = scanner to read from
  66    *
  67    * Returns:   Nonzero to claim the option.
  68    *
  69    * Use:       Handles an option string from the configuration file.
  70    */
  71
  72   int (*option)(target */*t*/, scanner */*sc*/);
  73
  74   /* --- @read@ --- *
  75    *
  76    * Arguments: @scanner *sc@ = pointer to scanner to read from
  77    *
  78    * Returns:   Pointer to a target object to claim, null to reject.
  79    *
  80    * Use:       Parses a target description from the configuration file.
  81    *            Only the socket target is allowed to omit the prefix on a
  82    *            target specification.
  83    */
  84
  85   target *(*read)(scanner */*sc*/);
  86
  87   /* --- @confirm@ --- *
  88    *
  89    * Arguments: @target *t@ = pointer to target
  90    *
  91    * Returns:   ---
  92    *
  93    * Use:       Confirms configuration of a target.
  94    */
  95
  96   void (*confirm)(target */*t*/);
  97
  98   /* --- @create@ --- *
  99    *
 100    * Arguments: @target *t@ = pointer to target
 101    *            @const char *desc@ = description of connection
 102    *
 103    * Returns:   Pointer to a created endpoint.
 104    *
 105    * Use:       Generates a target endpoint for communication.
 106    */
 107
 108   endpt *(*create)(target */*t*/, const char */*desc*/);
 109
 110   /* --- @destroy@ --- *
 111    *
 112    * Arguments: @target *t@ = pointer to target
 113    *
 114    * Returns:   ---
 115    *
 116    * Use:       Destroys a target.
 117    */
 118
 119   void (*destroy)(target */*t*/);
 120
 121 } target_ops;
 122
 123 /*----- That's all, folks -------------------------------------------------*/
 124
 125 #ifdef __cplusplus
 126   }
 127 #endif
 128
 129 #endif