/*
* 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) 2004,2007-2009 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>
* https://www.isc.org/
*/
/*
* @(#)resolv.h 8.1 (Berkeley) 6/2/93
* $Id: resolv.h,v 1.1.1.1 2012/10/09 09:06:54 misho Exp $
*/
#ifndef _RESOLV_H_
#define _RESOLV_H_
#include <sys/types.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"
#endif
typedef 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 _REENTRANT
extern struct __res_state *__res_state(void);
#define _res (*__res_state())
#else
#ifndef __BIND_NOSTATIC
extern struct __res_state _res;
#endif
#endif
void 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_ */
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