build: Rewrite the build system to be nicer.

[fwd] / target.h

/* -*-c-*-
 *
 * Description of forwarding targets
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of the `fw' port forwarder.
 *
 * `fw' is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * `fw' is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with `fw'; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef TARGET_H
#define TARGET_H

#ifdef __cplusplus
  extern "C" {
#endif

/*----- Header files ------------------------------------------------------*/

#include <stdio.h>

#ifndef ENDPT_H
#  include "endpt.h"
#endif

#ifndef SCAN_H
#  include "scan.h"
#endif

/*----- Data structures ---------------------------------------------------*/

/* --- A basic target object --- */

typedef struct target {
  struct target_ops *ops;
  char *desc;
} target;

/* --- Forwarding target operations --- */

typedef struct target_ops {
  const char *name;			/* Name of this target */

  /* --- @option@ --- *
   *
   * Arguments:	@target *t@ = pointer to target object, or zero if global
   *		@scanner *sc@ = scanner to read from
   *
   * Returns:	Nonzero to claim the option.
   *
   * Use:	Handles an option string from the configuration file.
   */

  int (*option)(target */*t*/, scanner */*sc*/);

  /* --- @read@ --- *
   *
   * Arguments:	@scanner *sc@ = pointer to scanner to read from
   *
   * Returns:	Pointer to a target object to claim, null to reject.
   *
   * Use:	Parses a target description from the configuration file.
   *		Only the socket target is allowed to omit the prefix on a
   *		target specification.
   */

  target *(*read)(scanner */*sc*/);

  /* --- @confirm@ --- *
   *
   * Arguments:	@target *t@ = pointer to target
   *
   * Returns:	---
   *
   * Use:	Confirms configuration of a target.
   */

  void (*confirm)(target */*t*/);

  /* --- @create@ --- *
   *
   * Arguments:	@target *t@ = pointer to target
   *		@const char *desc@ = description of connection
   *
   * Returns:	Pointer to a created endpoint.
   *
   * Use:	Generates a target endpoint for communication.
   */

  endpt *(*create)(target */*t*/, const char */*desc*/);

  /* --- @destroy@ --- *
   *
   * Arguments:	@target *t@ = pointer to target
   *
   * Returns:	---
   *
   * Use:	Destroys a target.
   */

  void (*destroy)(target */*t*/);

} target_ops;

/*----- That's all, folks -------------------------------------------------*/

#ifdef __cplusplus
  }
#endif

#endif