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resolv.h
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/* $OpenBSD: resolv.h,v 1.23 2021/11/22 20:18:27 jca Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*/
/*
* ++Copyright++ 1983, 1987, 1989, 1993
* -
* 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.
* 3. 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) 1993 by Digital Equipment Corporation.
*
* 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, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION 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.
* -
* --Copyright--
*/
/*
* @(#)resolv.h 8.1 (Berkeley) 6/2/93
* $From: resolv.h,v 8.17 1996/11/26 10:11:20 vixie Exp $
*/
#ifndef _RESOLV_H_
#define _RESOLV_H_
#include <sys/types.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
* initial 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 MAXDNSLUS 4 /* max # of host lookup types */
#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 */
struct __res_state {
int retrans; /* retransmission time interval */
int retry; /* number of times to retransmit */
unsigned int options; /* option flags - see below. */
int nscount; /* number of name servers */
int family[2]; /* specifies which address
* families will be queried and
* in which order */
struct sockaddr_in
nsaddr_list[MAXNS]; /* address of name server */
#define nsaddr nsaddr_list[0] /* for backward compatibility */
unsigned short id; /* current message id */
char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
char defdname[256]; /* default domain (deprecated) */
unsigned int 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 lookups[MAXDNSLUS];
struct { time_t __res_sec; long __res_nsec; } restimespec;
time_t reschktime;
};
#if 1 /* 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];
};
#endif
/*
* 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() */
/* KAME extensions: use higher bit to avoid conflict with ISC use */
#define RES_USE_EDNS0 0x40000000 /* use EDNS0 */
/* DNSSEC extensions: use higher bit to avoid conflict with ISC use */
#define RES_USE_DNSSEC 0x20000000 /* use DNSSEC using OK bit in OPT */
#define RES_USE_CD 0x10000000 /* set Checking Disabled flag */
#define RES_TRUSTAD 0x80000000 /* Request AD, keep it in responses. */
#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
/*
* Resolver "pfcode" values. Used by dig.
*/
#define RES_PRF_STATS 0x00000001
/* 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 */
/* hooks are still experimental as of 4.9.2 */
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,
const unsigned char **query,
int *querylen,
unsigned char *ans,
int anssiz,
int *resplen);
typedef res_sendhookact (*res_send_rhook)(const struct sockaddr_in *ns,
const unsigned char *query,
int querylen,
unsigned 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" */
};
extern struct __res_state _res;
#if 1 /* INET6 */
extern struct __res_state_ext _res_ext;
#endif
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_ntos __sym_ntos
#define b64_ntop __b64_ntop
#define b64_pton __b64_pton
#define dn_skipname __dn_skipname
#define putlong __putlong
#define putshort __putshort
#define p_class __p_class
#define p_type __p_type
#define dn_count_labels __dn_count_labels
#define dn_comp __dn_comp
#define res_randomid __res_randomid
#define res_send __res_send
#define res_opt __res_opt
#ifdef BIND_RES_POSIX3
#define dn_expand __dn_expand
#define res_init __res_init
#define res_query __res_query
#define res_search __res_search
#define res_querydomain __res_querydomain
#define res_mkquery __res_mkquery
#endif
__BEGIN_DECLS
int res_hnok(const char *);
int res_ownok(const char *);
int res_mailok(const char *);
int res_dnok(const char *);
const char * sym_ntos(const struct res_sym *, int, int *);
int b64_ntop(unsigned char const *, size_t, char *, size_t);
int b64_pton(char const *, unsigned char *, size_t);
int dn_skipname(const unsigned char *,
const unsigned char *);
void putlong(u_int32_t, unsigned char *);
void putshort(u_int16_t, unsigned char *);
const char * p_class(int);
const char * p_type(int);
int dn_comp(const char *, unsigned char *, int,
unsigned char **, unsigned char **);
int dn_expand(const unsigned char *, const unsigned char *,
const unsigned char *, char *, int);
int res_init(void);
unsigned int res_randomid(void);
int res_query(const char *, int, int, unsigned char *, int)
__attribute__((__bounded__(__string__,4,5)));
int res_search(const char *, int, int, unsigned char *, int)
__attribute__((__bounded__(__string__,4,5)));
int res_querydomain(const char *, const char *, int, int,
unsigned char *, int)
__attribute__((__bounded__(__string__,5,6)));
int res_mkquery(int, const char *, int, int,
const unsigned char *, int, const unsigned char *,
unsigned char *, int)
__attribute__((__bounded__(__string__,5,6)))
__attribute__((__bounded__(__string__,8,9)));
int res_send(const unsigned char *, int, unsigned char *,
int)
__attribute__((__bounded__(__string__,3,4)));
__END_DECLS
#endif /* !_RESOLV_H_ */