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

   1 /* -*-c-*-
   2  *
   3  * Description of forwarding targets
   4  *
   5  * (c) 1999 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the `fw' port forwarder.
  11  *
  12  * `fw' is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * `fw' is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with `fw'; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 #ifndef TARGET_H
  28 #define TARGET_H
  29
  30 #ifdef __cplusplus
  31   extern "C" {
  32 #endif
  33
  34 /*----- Header files ------------------------------------------------------*/
  35
  36 #include <stdio.h>
  37
  38 #ifndef ENDPT_H
  39 #  include "endpt.h"
  40 #endif
  41
  42 #ifndef SCAN_H
  43 #  include "scan.h"
  44 #endif
  45
  46 /*----- Data structures ---------------------------------------------------*/
  47
  48 /* --- A basic target object --- */
  49
  50 typedef struct target {
  51   struct target_ops *ops;
  52   char *desc;
  53 } target;
  54
  55 /* --- Forwarding target operations --- */
  56
  57 typedef struct target_ops {
  58   const char *name;                     /* Name of this target */
  59
  60   /* --- @option@ --- *
  61    *
  62    * Arguments: @target *t@ = pointer to target object, or zero if global
  63    *            @scanner *sc@ = scanner to read from
  64    *
  65    * Returns:   Nonzero to claim the option.
  66    *
  67    * Use:       Handles an option string from the configuration file.
  68    */
  69
  70   int (*option)(target */*t*/, scanner */*sc*/);
  71
  72   /* --- @read@ --- *
  73    *
  74    * Arguments: @scanner *sc@ = pointer to scanner to read from
  75    *
  76    * Returns:   Pointer to a target object to claim, null to reject.
  77    *
  78    * Use:       Parses a target description from the configuration file.
  79    *            Only the socket target is allowed to omit the prefix on a
  80    *            target specification.
  81    */
  82
  83   target *(*read)(scanner */*sc*/);
  84
  85   /* --- @confirm@ --- *
  86    *
  87    * Arguments: @target *t@ = pointer to target
  88    *
  89    * Returns:   ---
  90    *
  91    * Use:       Confirms configuration of a target.
  92    */
  93
  94   void (*confirm)(target */*t*/);
  95
  96   /* --- @create@ --- *
  97    *
  98    * Arguments: @target *t@ = pointer to target
  99    *            @const char *desc@ = description of connection
 100    *
 101    * Returns:   Pointer to a created endpoint.
 102    *
 103    * Use:       Generates a target endpoint for communication.
 104    */
 105
 106   endpt *(*create)(target */*t*/, const char */*desc*/);
 107
 108   /* --- @destroy@ --- *
 109    *
 110    * Arguments: @target *t@ = pointer to target
 111    *
 112    * Returns:   ---
 113    *
 114    * Use:       Destroys a target.
 115    */
 116
 117   void (*destroy)(target */*t*/);
 118
 119 } target_ops;
 120
 121 /*----- That's all, folks -------------------------------------------------*/
 122
 123 #ifdef __cplusplus
 124   }
 125 #endif
 126
 127 #endif