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

   1 /* -*-c-*-
   2  *
   3  * $Id: source.h,v 1.1 1999/07/26 23:33:01 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 /*----- Revision history --------------------------------------------------*
  30  *
  31  * $Log: source.h,v $
  32  * Revision 1.1  1999/07/26 23:33:01  mdw
  33  * Infrastructure for the new design.
  34  *
  35  */
  36
  37 #ifndef SOURCE_H
  38 #define SOURCE_H
  39
  40 #ifdef __cplusplus
  41   extern "C" {
  42 #endif
  43
  44 /*----- Header files ------------------------------------------------------*/
  45
  46 #include <stdio.h>
  47
  48 #ifndef SCAN_H
  49 #  include "scan.h"
  50 #endif
  51
  52 #ifndef TARGET_H
  53 #  include "target.h"
  54 #endif
  55
  56 /*----- Data structures ---------------------------------------------------*/
  57
  58 /* --- A basic source object --- */
  59
  60 typedef struct source {
  61   struct source *next, *prev;
  62   struct source_ops *ops;
  63   char *desc;
  64 } source;
  65
  66 /* --- Forwarding source operations --- */
  67
  68 typedef struct source_ops {
  69   const char *name;                     /* Name of this source */
  70
  71   /* --- @option@ --- *
  72    *
  73    * Arguments: @scanner *sc@ = scanner to read from
  74    *            @source *s@ = pointer to source object, or zero if global
  75    *
  76    * Returns:   Nonzero to claim the option.
  77    *
  78    * Use:       Handles an option string from the configuration file.
  79    */
  80
  81   int (*option)(source */*s*/, scanner */*sc*/);
  82
  83   /* --- @read@ --- *
  84    *
  85    * Arguments: @scanner *sc@ = pointer to scanner to read from
  86    *
  87    * Returns:   Pointer to a source object to claim, null to reject.
  88    *
  89    * Use:       Parses a source description from the configuration file.
  90    *            Only the socket source is allowed to omit the prefix on a
  91    *            source specification.
  92    */
  93
  94   source *(*read)(scanner */*sc*/);
  95
  96   /* --- @attach@ --- *
  97    *
  98    * Arguments: @source *s@ = pointer to source
  99    *            @scanner *sc@ = scanner (for error reporting)
 100    *            @target *t@ = pointer to target to attach
 101    *
 102    * Returns:   ---
 103    *
 104    * Use:       Attaches a target to a source.
 105    */
 106
 107   void (*attach)(source */*s*/, scanner */*sc*/, target */*t*/);
 108
 109   /* --- @destroy@ --- *
 110    *
 111    * Arguments: @source *s@ = pointer to source
 112    *
 113    * Returns:   ---
 114    *
 115    * Use:       Destroys a source.  Used when closing the system down, for
 116    *            example as a result of a signal.
 117    */
 118
 119   void (*destroy)(source */*s*/);
 120
 121 } source_ops;
 122
 123 /*----- Functions provided ------------------------------------------------*/
 124
 125 /* --- @source_add@ --- *
 126  *
 127  * Arguments:   @source *s@ = pointer to a source
 128  *
 129  * Returns:     ---
 130  *
 131  * Use:         Adds a source to the master list.  Only do this for passive
 132  *              sources (e.g., listening sockets), not active sources (e.g.,
 133  *              executable programs).
 134  */
 135
 136 extern void source_add(source */*s*/);
 137
 138 /* --- @source_remove@ --- *
 139  *
 140  * Arguments:   @source *s@ = pointer to a source
 141  *
 142  * Returns:     ---
 143  *
 144  * Use:         Removes a source from the master list.
 145  */
 146
 147 extern void source_remove(source */*s*/);
 148
 149 /* --- @source_killall@ --- *
 150  *
 151  * Arguments:   ---
 152  *
 153  * Returns:     ---
 154  *
 155  * Use:         Frees all sources.
 156  */
 157
 158 extern void source_killall(void);
 159
 160 /*----- That's all, folks -------------------------------------------------*/
 161
 162 #ifdef __cplusplus
 163   }
 164 #endif
 165
 166 #endif