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

   1 /* -*-c-*-
   2  *
   3  * Description of forwarding sources
   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 SOURCE_H
  28 #define SOURCE_H
  29
  30 #ifdef __cplusplus
  31   extern "C" {
  32 #endif
  33
  34 /*----- Header files ------------------------------------------------------*/
  35
  36 #include <stdio.h>
  37
  38 #ifndef SCAN_H
  39 #  include "scan.h"
  40 #endif
  41
  42 #ifndef TARGET_H
  43 #  include "target.h"
  44 #endif
  45
  46 /*----- Data structures ---------------------------------------------------*/
  47
  48 /* --- A basic source object --- */
  49
  50 typedef struct source {
  51   struct source *next, *prev;
  52   struct source_ops *ops;
  53   char *desc;
  54 } source;
  55
  56 /* --- Forwarding source operations --- */
  57
  58 typedef struct source_ops {
  59   const char *name;                     /* Name of this source */
  60
  61   /* --- @option@ --- *
  62    *
  63    * Arguments: @scanner *sc@ = scanner to read from
  64    *            @source *s@ = pointer to source object, or zero if global
  65    *
  66    * Returns:   Nonzero to claim the option.
  67    *
  68    * Use:       Handles an option string from the configuration file.
  69    */
  70
  71   int (*option)(source */*s*/, scanner */*sc*/);
  72
  73   /* --- @read@ --- *
  74    *
  75    * Arguments: @scanner *sc@ = pointer to scanner to read from
  76    *
  77    * Returns:   Pointer to a source object to claim, null to reject.
  78    *
  79    * Use:       Parses a source description from the configuration file.
  80    *            Only the socket source is allowed to omit the prefix on a
  81    *            source specification.
  82    */
  83
  84   source *(*read)(scanner */*sc*/);
  85
  86   /* --- @attach@ --- *
  87    *
  88    * Arguments: @source *s@ = pointer to source
  89    *            @scanner *sc@ = scanner (for error reporting)
  90    *            @target *t@ = pointer to target to attach
  91    *
  92    * Returns:   ---
  93    *
  94    * Use:       Attaches a target to a source.
  95    */
  96
  97   void (*attach)(source */*s*/, scanner */*sc*/, target */*t*/);
  98
  99   /* --- @destroy@ --- *
 100    *
 101    * Arguments: @source *s@ = pointer to source
 102    *
 103    * Returns:   ---
 104    *
 105    * Use:       Destroys a source.  Used when closing the system down, for
 106    *            example as a result of a signal.
 107    */
 108
 109   void (*destroy)(source */*s*/);
 110
 111 } source_ops;
 112
 113 /*----- Functions provided ------------------------------------------------*/
 114
 115 /* --- @source_add@ --- *
 116  *
 117  * Arguments:   @source *s@ = pointer to a source
 118  *
 119  * Returns:     ---
 120  *
 121  * Use:         Adds a source to the master list.  Only do this for passive
 122  *              sources (e.g., listening sockets), not active sources (e.g.,
 123  *              executable programs).
 124  */
 125
 126 extern void source_add(source */*s*/);
 127
 128 /* --- @source_remove@ --- *
 129  *
 130  * Arguments:   @source *s@ = pointer to a source
 131  *
 132  * Returns:     ---
 133  *
 134  * Use:         Removes a source from the master list.
 135  */
 136
 137 extern void source_remove(source */*s*/);
 138
 139 /* --- @source_killall@ --- *
 140  *
 141  * Arguments:   ---
 142  *
 143  * Returns:     ---
 144  *
 145  * Use:         Frees all sources.
 146  */
 147
 148 extern void source_killall(void);
 149
 150 /*----- That's all, folks -------------------------------------------------*/
 151
 152 #ifdef __cplusplus
 153   }
 154 #endif
 155
 156 #endif