/*
 * Pluto Asynchronous DNS Helper Program's Header
 *
 * Copyright (C) 2002  D. Hugh Redelmeier.
 *
 * This program 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program 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.
 */

#ifndef _ADNS_H
#define _ADNS_H

#include <resolv.h>

/*
 * The interface in RHL6.x and BIND distribution 8.2.2 are different,
 * so we build some of our own :-(
 */

#ifndef NS_MAXDNAME
#define NS_MAXDNAME 1025
#endif

#ifndef NS_PACKETSZ
#define NS_PACKETSZ 512
#endif

/* protocol version */

#define ADNS_Q_MAGIC (((((('d' << 8) + 'n') << 8) + 's') << 8) + 4)
#define ADNS_A_MAGIC (((((('d' << 8) + 'n') << 8) + 's') << 8) + 128 + 4)

/*
 * note: both struct adns_query and struct adns_answer must start with
 * size_t len;
 */

struct adns_query {
	size_t len;
	unsigned int qmagic;
	unsigned long serial;
	lset_t debugging;
	char name_buf[NS_MAXDNAME + 2];
	int type;               /* T_KEY or T_TXT */
};

struct adns_answer {
	size_t len;
	unsigned int amagic;
	unsigned long serial;
	struct adns_continuation *continuation;
	int result;
	int h_errno_val;
	u_char ans[NS_PACKETSZ * 10]; /* very probably bigger than necessary */
};

enum helper_exit_status {
	HES_CONTINUE = -1,	/* not an exit */
	HES_OK = 0,		/* all's well that ends well (perhaps EOF) */
	HES_INVOCATION,		/* improper invocation */
	HES_IO_ERROR_SELECT,	/* IO error in select() */
	HES_MALLOC,		/* malloc failed */
	HES_IO_ERROR_IN,	/* error reading pipe */
	HES_IO_ERROR_OUT,	/* error reading pipe */
	HES_PIPE,		/* pipe(2) failed */
	HES_SYNC,		/* answer from worker doesn't match query */
	HES_FORK,		/* fork(2) failed */
	HES_RES_INIT,		/* resolver initialization failed */
	HES_BAD_LEN,		/* implausible .len field */
	HES_BAD_MAGIC,		/* .magic field wrong */
};

#endif	/* _ADNS_H */
