/*
 * Copyright (c) 2000-2001 Proofpoint, Inc. and its suppliers.
 *	All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 */

/*
 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * 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.
 *
 * 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
 */

/* $Id: sm_resolve.h,v 8.9 2013-11-22 20:51:56 ca Exp $ */

#ifndef SM_RESOLVE_H
#define SM_RESOLVE_H

#if DNSMAP || DANE
/* We use these, but they are not always present in <arpa/nameser.h> */

#  ifndef T_TXT
#   define T_TXT		16
#  endif
#  ifndef T_AFSDB
#   define T_AFSDB		18
#  endif
#  ifndef T_SRV
#   define T_SRV		33
#  endif
#  ifndef T_NAPTR
#   define T_NAPTR		35
#  endif
#  ifndef T_RRSIG
#   define T_RRSIG		46
#  endif
#  ifndef T_TLSA
#   define T_TLSA		52
#  endif

typedef struct
{
	char		*dns_q_domain;
	unsigned int	dns_q_type;
	unsigned int	dns_q_class;
} DNS_QUERY_T;

typedef struct
{
	unsigned int	mx_r_preference;
	char		mx_r_domain[1];
} MX_RECORD_T;

typedef struct
{
	unsigned int	srv_r_priority;
	unsigned int	srv_r_weight;
	unsigned int	srv_r_port;
	char		srv_r_target[1];
} SRV_RECORDT_T;


typedef struct resource_record RESOURCE_RECORD_T;

struct resource_record
{
	char			*rr_domain;
	unsigned int		rr_type;
	unsigned int		rr_class;
	unsigned int		rr_ttl;
	unsigned int		rr_size;
	union
	{
		void		*rr_data;
		MX_RECORD_T	*rr_mx;
		MX_RECORD_T	*rr_afsdb; /* mx and afsdb are identical */
		SRV_RECORDT_T	*rr_srv;
#  if NETINET
		struct in_addr	*rr_a;
#  endif
#  if NETINET6
		struct in6_addr *rr_aaaa;
#  endif
		char		*rr_txt;
	} rr_u;
	RESOURCE_RECORD_T *rr_next;
};

#  if !defined(T_A) && !defined(T_AAAA)
/* XXX if <arpa/nameser.h> isn't included */
typedef int HEADER; /* will never be used */
#  endif

typedef struct
{
	HEADER			dns_r_h;
	DNS_QUERY_T		dns_r_q;
	RESOURCE_RECORD_T	*dns_r_head;
} DNS_REPLY_T;

#define SM_DNS_FL_EDNS0		0x01
#define SM_DNS_FL_DNSSEC	0x02

/* flags for parse_dns_reply() et.al. */
#define RR_AS_TEXT	0x01	/* convert some RRs to text, e.g., TLSA */
#define RR_RAW		0x02	/* return some RRs as "raw" data */
			/* currently not used (set, but not read) */
#define RR_NO_CNAME	0x04	/* do not try CNAME lookup */
#define RR_ONLY_CNAME	0x08	/* if !RR_NO_CNAME" return only CNAME */

extern void		dns_free_data __P((DNS_REPLY_T *));
extern int		dns_string_to_type __P((const char *));
extern const char	*dns_type_to_string __P((int));
extern DNS_REPLY_T	*dns_lookup_map __P((const char *, int, int, time_t,
				int, unsigned int));
extern DNS_REPLY_T	*dns_lookup_int __P((const char *, int, int, time_t,
				int, unsigned int, unsigned int, int *, int *));
#  if 0
extern DNS_REPLY_T	*dns_lookup __P((const char *domain,
				const char *type_name,
				time_t retrans,
				int retry));
#  endif /* 0 */

#  if DANE
struct hostent *dns2he __P((DNS_REPLY_T *, int));
#  endif

/* what to do if family is not supported? add SM_ASSERT()? */
#define FAM2T_(family) (((family) == AF_INET) ? T_A : T_AAAA)

#  if DNSSEC_TEST
const char *herrno2txt __P((int));
int setherrnofromstring __P((const char *, int *));
int getttlfromstring __P((const char *));
int tstdns_search __P((const char *, int, int, u_char *, int));
int tstdns_querydomain  __P((const char *, const char *, int, int, unsigned char *, int));

#  endif /* DNSSEC_TEST*/

#ifndef RES_TRUSTAD
# define RES_TRUSTAD	0
#endif
#define SM_RES_DNSSEC (RES_USE_EDNS0|RES_USE_DNSSEC|RES_TRUSTAD)

#endif /* DNSMAP || DANE */

#if DNSSEC_TEST || _FFR_NAMESERVER
# ifdef _DEFINE_SMR_GLOBALS
#  define SMR_EXTERN
# else
#  define SMR_EXTERN extern
# endif
SMR_EXTERN char *NameSearchList;
# undef SMR_EXTERN
extern int	nsportip __P((char *));
#endif /* DNSSEC_TEST || _FFR_NAMESERVER */

#endif /* ! SM_RESOLVE_H */