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

   1 /* -*-c-*-
   2  *
   3  * $Id: source.h,v 1.2 2004/04/08 01:36:25 mdw Exp $
   4  *
   5  * Description of forwarding sources
   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 SOURCE_H
  30 #define SOURCE_H
  31
  32 #ifdef __cplusplus
  33   extern "C" {
  34 #endif
  35
  36 /*----- Header files ------------------------------------------------------*/
  37
  38 #include <stdio.h>
  39
  40 #ifndef SCAN_H
  41 #  include "scan.h"
  42 #endif
  43
  44 #ifndef TARGET_H
  45 #  include "target.h"
  46 #endif
  47
  48 /*----- Data structures ---------------------------------------------------*/
  49
  50 /* --- A basic source object --- */
  51
  52 typedef struct source {
  53   struct source *next, *prev;
  54   struct source_ops *ops;
  55   char *desc;
  56 } source;
  57
  58 /* --- Forwarding source operations --- */
  59
  60 typedef struct source_ops {
  61   const char *name;                     /* Name of this source */
  62
  63   /* --- @option@ --- *
  64    *
  65    * Arguments: @scanner *sc@ = scanner to read from
  66    *            @source *s@ = pointer to source object, or zero if global
  67    *
  68    * Returns:   Nonzero to claim the option.
  69    *
  70    * Use:       Handles an option string from the configuration file.
  71    */
  72
  73   int (*option)(source */*s*/, scanner */*sc*/);
  74
  75   /* --- @read@ --- *
  76    *
  77    * Arguments: @scanner *sc@ = pointer to scanner to read from
  78    *
  79    * Returns:   Pointer to a source object to claim, null to reject.
  80    *
  81    * Use:       Parses a source description from the configuration file.
  82    *            Only the socket source is allowed to omit the prefix on a
  83    *            source specification.
  84    */
  85
  86   source *(*read)(scanner */*sc*/);
  87
  88   /* --- @attach@ --- *
  89    *
  90    * Arguments: @source *s@ = pointer to source
  91    *            @scanner *sc@ = scanner (for error reporting)
  92    *            @target *t@ = pointer to target to attach
  93    *
  94    * Returns:   ---
  95    *
  96    * Use:       Attaches a target to a source.
  97    */
  98
  99   void (*attach)(source */*s*/, scanner */*sc*/, target */*t*/);
 100
 101   /* --- @destroy@ --- *
 102    *
 103    * Arguments: @source *s@ = pointer to source
 104    *
 105    * Returns:   ---
 106    *
 107    * Use:       Destroys a source.  Used when closing the system down, for
 108    *            example as a result of a signal.
 109    */
 110
 111   void (*destroy)(source */*s*/);
 112
 113 } source_ops;
 114
 115 /*----- Functions provided ------------------------------------------------*/
 116
 117 /* --- @source_add@ --- *
 118  *
 119  * Arguments:   @source *s@ = pointer to a source
 120  *
 121  * Returns:     ---
 122  *
 123  * Use:         Adds a source to the master list.  Only do this for passive
 124  *              sources (e.g., listening sockets), not active sources (e.g.,
 125  *              executable programs).
 126  */
 127
 128 extern void source_add(source */*s*/);
 129
 130 /* --- @source_remove@ --- *
 131  *
 132  * Arguments:   @source *s@ = pointer to a source
 133  *
 134  * Returns:     ---
 135  *
 136  * Use:         Removes a source from the master list.
 137  */
 138
 139 extern void source_remove(source */*s*/);
 140
 141 /* --- @source_killall@ --- *
 142  *
 143  * Arguments:   ---
 144  *
 145  * Returns:     ---
 146  *
 147  * Use:         Frees all sources.
 148  */
 149
 150 extern void source_killall(void);
 151
 152 /*----- That's all, folks -------------------------------------------------*/
 153
 154 #ifdef __cplusplus
 155   }
 156 #endif
 157
 158 #endif