/* 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

/* dummy struct to make compilers happy */
struct adns_query {
};

#else /* rest of file */

/* 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 MAXDNAME /* I hope this is long enough for IPv6 */
# endif

# ifndef NS_PACKETSZ
#   define NS_PACKETSZ PACKETSZ
# 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;   /* only used #ifdef DEBUG, but don't want layout to change */
	u_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 */