/*-

  * Copyright (c) 1983, 1987, 1989, 1993

  *	The Regents of the University of California.  All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met:

  * 1. Redistributions of source code must retain the above copyright

  *    notice, this list of conditions and the following disclaimer.

  * 2. Redistributions in binary form must reproduce the above copyright

  *    notice, this list of conditions and the following disclaimer in the

  *    documentation and/or other materials provided with the distribution.

  * 4. Neither the name of the University nor the names of its contributors

  *    may be used to endorse or promote products derived from this software

  *    without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  * SUCH DAMAGE.

  */

 /*

  * Portions Copyright (c) 1996 by Internet Software Consortium.

  *

  * Permission to use, copy, modify, and distribute this software for any

  * purpose with or without fee is hereby granted, provided that the above

  * copyright notice and this permission notice appear in all copies.

  *

  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS

  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

  * SOFTWARE.

  * © Portions copyright (c) 2007 Symbian Software Ltd. All rights reserved.

  */

 /*

  *	@(#)resolv.h	8.1 (Berkeley) 6/2/93

  *	From Id: resolv.h,v 8.12 1998/04/28 19:36:46 halley Exp $

  * $FreeBSD: src/include/resolv.h,v 1.26 2004/09/09 17:39:47 yar Exp $

  */

 #ifndef _RESOLV_H_

 #define	_RESOLV_H_

 #include <sys/param.h>

 #include <sys/types.h>

 #include <sys/cdefs.h>

 #include <sys/socket.h>

 #include <stdio.h>

 /*

  * Revision information.  This is the release date in YYYYMMDD format.

  * It can change every day so the right thing to do with it is use it

  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not

  * compare for equality; rather, use it to determine whether your resolver

  * is new enough to contain a certain feature.

  */

 #define	__RES	19960801

 /*

  * Resolver configuration file.

  * Normally not present, but may contain the address of the

  * inital name server(s) to query and the domain search list.

  */

 #ifndef _PATH_RESCONF

 #define	_PATH_RESCONF        "/etc/resolv.conf"

 #endif

 /*

  * Global defines and variables for resolver stub.

  */

 #define	MAXNS			3	/* max # name servers we'll track */

 #define	MAXDFLSRCH		3	/* # default domain levels to try */

 #define	MAXDNSRCH		6	/* max # domains in search path */

 #define	LOCALDOMAINPARTS	2	/* min levels in name that is "local" */

 #define	RES_TIMEOUT		5	/* min. seconds between retries */

 #define	RES_DFLRETRY		4	/* retries per each name server */

 #define	MAXRESOLVSORT		10	/* number of net to sort on */

 #define	RES_MAXNDOTS		15	/* should reflect bit field size */

 #define	RES_MAXRETRANS		30	/* only for resolv.conf/RES_OPTIONS */

 #define	RES_MAXRETRY		5	/* only for resolv.conf/RES_OPTIONS */

 struct __res_state {

 	int	retrans;	 	/* retransmition time interval */

 	int	retry;			/* number of times to retransmit */

 	u_long	options;		/* option flags - see below. */

 	int	nscount;		/* number of name servers */

 	struct sockaddr_in

 		nsaddr_list[MAXNS];	/* address of name server */

 #define	nsaddr	nsaddr_list[0]		/* for backward compatibility */

 	u_short	id;			/* current message id */

 	char	*dnsrch[MAXDNSRCH+1];	/* components of domain to search */

 	char	defdname[256];		/* default domain (deprecated) */

 	u_long	pfcode;			/* RES_PRF_ flags - see below. */

 	unsigned ndots:4;		/* threshold for initial abs. query */

 	unsigned nsort:4;		/* number of elements in sort_list[] */

 	char	unused[3];

 	struct {

 		struct in_addr	addr;

 		u_int32_t	mask;

 	} sort_list[MAXRESOLVSORT];

 	char	pad[72];		/* on an i386 this means 512b total */

 };

 /* for INET6 */

 /*

  * replacement of __res_state, separated to keep binary compatibility.

  */

 struct __res_state_ext {

 	struct sockaddr_storage nsaddr_list[MAXNS];

 	struct {

 		int	af;		/* address family for addr, mask */

 		union {

 			struct	in_addr ina;

 			struct	in6_addr in6a;

 		} addr, mask;

 	} sort_list[MAXRESOLVSORT];

 };

 /*

  * Resolver options (keep these in synch with res_debug.c, please)

  */

 #define RES_INIT	0x00000001	/* address initialized */

 #define RES_DEBUG	0x00000002	/* print debug messages */

 #define RES_AAONLY	0x00000004	/* authoritative answers only (!IMPL)*/

 #define RES_USEVC	0x00000008	/* use virtual circuit */

 #define RES_PRIMARY	0x00000010	/* query primary server only (!IMPL) */

 #define RES_IGNTC	0x00000020	/* ignore truncation errors */

 #define RES_RECURSE	0x00000040	/* recursion desired */

 #define RES_DEFNAMES	0x00000080	/* use default domain name */

 #define RES_STAYOPEN	0x00000100	/* Keep TCP socket open */

 #define RES_DNSRCH	0x00000200	/* search up local domain tree */

 #define	RES_INSECURE1	0x00000400	/* type 1 security disabled */

 #define	RES_INSECURE2	0x00000800	/* type 2 security disabled */

 #define	RES_NOALIASES	0x00001000	/* shuts off HOSTALIASES feature */

 #define	RES_USE_INET6	0x00002000	/* use/map IPv6 in gethostbyname() */

 #define	RES_NOTLDQUERY	0x00004000	/* Don't query TLD names */

 /* KAME extensions: use higher bit to avoid conflict with ISC use */

 #define	RES_USE_EDNS0	0x40000000	/* use EDNS0 */

 #define RES_DEFAULT	(RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)

 /*

  * Resolver "pfcode" values.  Used by dig.

  */

 #define	RES_PRF_STATS	0x00000001

 #define	RES_PRF_UPDATE	0x00000002

 #define	RES_PRF_CLASS   0x00000004

 #define	RES_PRF_CMD	0x00000008

 #define	RES_PRF_QUES	0x00000010

 #define	RES_PRF_ANS	0x00000020

 #define	RES_PRF_AUTH	0x00000040

 #define	RES_PRF_ADD	0x00000080

 #define	RES_PRF_HEAD1	0x00000100

 #define	RES_PRF_HEAD2	0x00000200

 #define	RES_PRF_TTLID	0x00000400

 #define	RES_PRF_HEADX	0x00000800

 #define	RES_PRF_QUERY	0x00001000

 #define	RES_PRF_REPLY	0x00002000

 #define	RES_PRF_INIT    0x00004000

 /*			0x00008000	*/

 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }

 	res_sendhookact;

 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *ns,

 					  const u_char **query,

 					  int *querylen,

 					  u_char *ans,

 					  int anssiz,

 					  int *resplen);

 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *ns,

 					  const u_char *query,

 					  int querylen,

 					  u_char *ans,

 					  int anssiz,

 					  int *resplen);

 struct res_sym {

 	int	number;		/* Identifying number, like T_MX */

 	char *	name;		/* Its symbolic name, like "MX" */

 	char *	humanname;	/* Its fun name, like "mail exchanger" */

 };

 __BEGIN_DECLS

 extern struct __res_state *___res(void);

 extern struct __res_state_ext *___res_ext(void);

 __END_DECLS

 #define	_res		(*___res())

 #define	_res_ext	(*___res_ext())

 /* for INET6 */

 extern struct __res_state_ext _res_ext;

 extern const struct res_sym __p_class_syms[];

 extern const struct res_sym __p_type_syms[];

 /* Private routines shared between libc/net, named, nslookup and others. */

 #define	res_hnok	__res_hnok

 #define	res_ownok	__res_ownok

 #define	res_mailok	__res_mailok

 #define	res_dnok	__res_dnok

 #define	sym_ston	__sym_ston

 #define	sym_ntos	__sym_ntos

 #define	sym_ntop	__sym_ntop

 #define	b64_ntop	__b64_ntop

 #define	b64_pton	__b64_pton

 #define	loc_ntoa	__loc_ntoa

 #define	loc_aton	__loc_aton

 #define	fp_resstat	__fp_resstat

 #define	p_query		__p_query

 #define	dn_skipname	__dn_skipname

 #define	fp_resstat	__fp_resstat

 #define	fp_query	__fp_query

 #define	fp_nquery	__fp_nquery

 #define	hostalias	__hostalias

 #define	putlong		__putlong

 #define	putshort	__putshort

 #define	p_class		__p_class

 #define	p_time		__p_time

 #define	p_type		__p_type

 #define	p_query		__p_query

 #define	p_cdnname	__p_cdnname

 #define	p_section	__p_section

 #define	p_cdname	__p_cdname

 #define	p_fqnname	__p_fqnname

 #define	p_fqname	__p_fqname

 #define	p_option	__p_option

 #define	p_secstodate	__p_secstodate

 #define	dn_count_labels	__dn_count_labels

 #define	dn_comp		__dn_comp

 #define	dn_expand	__dn_expand

 #define	res_init	__res_init

 #define	res_randomid	__res_randomid

 #define	res_query	__res_query

 #define	res_search	__res_search

 #define	res_querydomain	__res_querydomain

 #define	res_mkquery	__res_mkquery

 #define	res_send	__res_send

 #define	res_isourserver	__res_isourserver

 #define	res_nameinquery	__res_nameinquery

 #define	res_queriesmatch __res_queriesmatch

 #define	res_close	__res_close

 #define	res_opt		__res_opt

 #define	res_mkupdate	__res_mkupdate

 #define	res_mkupdrec	__res_mkupdrec

 #define	res_freeupdrec	__res_freeupdrec

 #endif /* !_RESOLV_H_ */