/* * Copyright (c) 1983, 1987, 1989 *    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. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: * 	This product includes software developed by the University of * 	California, Berkeley and its contributors. * 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) 2004 by Internet Systems Consortium, Inc. ("ISC") * Portions Copyright (c) 1995-2003 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 ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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. * *   Internet Systems Consortium, Inc. *   950 Charter Street *   Redwood City, CA 94063 *   <info@isc.org> *   http://www.isc.org/ *//* *	@(#)resolv.h	8.1 (Berkeley) 6/2/93 *	$Id: resolv.h,v 1.4 2005/03/17 20:15:15 dhankins Exp $ */#ifndef _RESOLV_H_#define	_RESOLV_H_/* * This used to be defined in res_query.c, now it's in herror.c. * [XXX no it's not.  It's in irs/irs_data.c] * It was * never extern'd by any *.h file before it was placed here.  For thread * aware programs, the last h_errno value set is stored in res->h_errno. * * XXX:	There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO *	(and __h_errno_set) to the public via <resolv.h>. * XXX:	__h_errno_set is really part of IRS, not part of the resolver. *	If somebody wants to build and use a resolver that doesn't use IRS, *	what do they do?  Perhaps something like *		#ifdef WANT_IRS *		# define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x) *		#else *		# define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x)) *		#endif */#define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)struct __res_state; /* forward */void __h_errno_set(struct __res_state *res, int err);/* * 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"#endiftypedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }	res_sendhookact;typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,					      double **query,					      unsigned *querylen,					      double *ans,					      unsigned anssiz,					      int *resplen);typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,					   double *query,					   unsigned querylen,					   double *ans,					   unsigned 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" */};/* * 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	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 */#define	RES_DFLRETRY		2	/* Default #/tries. */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];	res_send_qhook qhook;		/* query hook */	res_send_rhook rhook;		/* response hook */	int	res_h_errno;		/* last one set for this context */	int	_sock;			/* PRIVATE: for res_send i/o */	u_int	_flags;			/* PRIVATE: see below */	char	pad[52];		/* On an i386 this means 512b total. */};typedef struct __res_state *res_state;/* * Resolver flags (used to be discrete per-module statics ints). */#define	RES_F_VC	0x00000001	/* socket is TCP */#define	RES_F_CONN	0x00000002	/* socket is connected *//* res_findzonecut() options */#define	RES_EXHAUSTIVE	0x00000001	/* always do all queries *//* * 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 trucation 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_ROTATE	0x00004000	/* rotate ns list after each query */#define	RES_NOCHECKNAME	0x00008000	/* do not check names for sanity. */#define	RES_KEEPTSIG	0x00010000	/* do not strip TSIG records */#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	*/#if 0/* Things involving an internal (static) resolver context. */#ifdef _REENTRANTextern struct __res_state *__res_state(void);#define _res (*__res_state())#else#ifndef __BIND_NOSTATICextern struct __res_state _res;#endif#endifvoid		fp_nquery (const u_char *, int, FILE *);void		fp_query (const u_char *, FILE *);const char *	hostalias (const char *);void		p_query (const u_char *);void		res_close (void);int		res_init (void);int		res_isourserver (const struct sockaddr_in *);int		res_mkquery (int, const char *, int, int, const u_char *,				 int, const u_char *, u_char *, int);int		res_query (const char *, int, int, u_char *, int);int		res_querydomain (const char *, const char *, int, int,				     u_char *, int);int		res_search (const char *, int, int, u_char *, int);int		res_send (const u_char *, int, u_char *, int);int		res_sendsigned (const u_char *, int, ns_tsig_key *,				    u_char *, int);#if !defined(SHARED_LIBBIND) || defined(LIB)/* * If libbind is a shared object (well, DLL anyway) * these externs break the linker when resolv.h is  * included by a lib client (like named) * Make them go away if a client is including this * */extern const struct res_sym __p_key_syms[];extern const struct res_sym __p_cert_syms[];extern const struct res_sym __p_class_syms[];extern const struct res_sym __p_type_syms[];extern const struct res_sym __p_rcode_syms[];#endif /* SHARED_LIBBIND */int		res_hnok (const char *);int		res_ownok (const char *);int		res_mailok (const char *);int		res_dnok (const char *);int		sym_ston (const struct res_sym *, const char *, int *);const char *	sym_ntos (const struct res_sym *, int, int *);const char *	sym_ntop (const struct res_sym *, int, int *);int		b64_ntop (u_char const *, size_t, char *, size_t);int		b64_pton (char const *, u_char *, size_t);int		loc_aton (const char *ascii, u_char *binary);const char *	loc_ntoa (const u_char *binary, char *ascii);int		dn_skipname (const u_char *, const u_char *);void		putlong (u_int32_t, u_char *);void		putshort (u_int16_t, u_char *);const char *	p_class (int);const char *	p_time (u_int32_t);const char *	p_type (int);const char *	p_rcode (int);const u_char *	p_cdnname (const u_char *, const u_char *, int, FILE *);const u_char *	p_cdname (const u_char *, const u_char *, FILE *);const u_char *	p_fqnname (const u_char *cp, const u_char *msg,			       int, char *, int);const u_char *	p_fqname (const u_char *, const u_char *, FILE *);const char *	p_option (u_long option);char *		p_secstodate (u_long);int		dn_count_labels (const char *);int		dn_expand (const u_char *, const u_char *, const u_char *,			       char *, int);u_int		res_randomid (void);int		res_nameinquery (const char *, int, int,				     const u_char *, const u_char *);int		res_queriesmatch (const u_char *, const u_char *,				      const u_char *, const u_char *);const char *	p_section (int section, int opcode);/* Things involving a resolver context. */int		res_ninit (res_state);int		res_nisourserver (const res_state,				      const struct sockaddr_in *);void		fp_resstat (const res_state, FILE *);void		res_npquery (const res_state, const u_char *, int, FILE *);const char *	res_hostalias (const res_state, const char *,				   char *, size_t);int		res_nquery (res_state,				const char *, int, int, u_char *, int);int		res_nsearch (res_state, const char *, int,				 int, u_char *, int);int		res_nquerydomain (res_state,				      const char *, const char *, int, int,				      u_char *, int);int		res_nmkquery (res_state,				  int, const char *, int, int, const u_char *,				  int, const u_char *, u_char *, int);int		res_nsend (res_state, const u_char *, int, u_char *, int);int		res_nsendsigned (res_state, const u_char *, int,				     ns_tsig_key *, u_char *, int);int		res_findzonecut (res_state, const char *, ns_class, int,				     char *, size_t, struct in_addr *, int);void		res_nclose (res_state);#endif /* 0 */#endif /* !_RESOLV_H_ */