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glibc/resolv/resolv.h
Ulrich Drepper b64e156626 Update. 
2002-05-21  Jakub Jelinek  <jakub@redhat.com>

	* resolv/resolv.h (struct __res_state): Remove unused nstimes.
	Add nsmap.
	* resolv/res_init.c (__res_vinit): Initialize nsmap array.
	Remove nstimes setting.
	(res_nclose): Check all MAXNS nameservers with non-NULL nsaddrs.
	* resolv/res_send.c (res_nsend): Don't close unconditionally if
	there is mix of IPv6 and IPv4 nameservers.
	Use nsmap array to find free slots and preserve nameserver ordering.
	Fix RES_ROTATE.
2002-05-31 07:54:02 +00:00

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/*
* 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.
* 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) 1996-1999 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.
*/
/*
* @(#)resolv.h 8.1 (Berkeley) 6/2/93
* $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
*/
#ifndef _RESOLV_H_
#ifndef __need_res_state
# define _RESOLV_H_
# include <sys/param.h>
# if (!defined(BSD)) || (BSD < 199306)
# include <sys/bitypes.h>
# else
# include <sys/types.h>
# endif
# include <sys/cdefs.h>
# include <stdio.h>
# include <arpa/nameser.h>
#endif
#include <netinet/in.h>
#ifndef __res_state_defined
# define __res_state_defined
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 u_char **query,
int *querylen,
u_char *ans,
int anssiz,
int *resplen);
typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
const u_char *query,
int querylen,
u_char *ans,
int anssiz,
int *resplen);
/*
* 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. */
# define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
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 _vcsock; /* PRIVATE: for res_send VC i/o */
u_int _flags; /* PRIVATE: see below */
union {
char pad[52]; /* On an i386 this means 512b total. */
struct {
u_int16_t nscount;
u_int16_t nsmap[MAXNS];
int nssocks[MAXNS];
u_int16_t nscount6;
u_int16_t nsinit;
struct sockaddr_in6 *nsaddrs[MAXNS];
} _ext;
} _u;
};
typedef struct __res_state *res_state;
# undef __need_res_state
#endif
#ifdef _RESOLV_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 19991006
/*
* 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
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" */
};
/*
* 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_BLAST 0x00020000 /* blast all recursive servers */
#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 */
/* Things involving an internal (static) resolver context. */
#if !defined _LIBC || defined _LIBC_REENTRANT
__BEGIN_DECLS
extern struct __res_state *__res_state(void) __attribute__ ((__const__));
__END_DECLS
#define _res (*__res_state())
#else
#ifndef __BIND_NOSTATIC
extern struct __res_state _res;
#endif
#endif
#ifndef __BIND_NOSTATIC
#define fp_nquery __fp_nquery
#define fp_query __fp_query
#define hostalias __hostalias
#define p_query __p_query
#define res_close __res_close
#define res_init __res_init
#define res_isourserver __res_isourserver
#define res_mkquery __res_mkquery
#define res_query __res_query
#define res_querydomain __res_querydomain
#define res_search __res_search
#define res_send __res_send
__BEGIN_DECLS
void fp_nquery __P((const u_char *, int, FILE *));
void fp_query __P((const u_char *, FILE *));
const char * hostalias __P((const char *));
void p_query __P((const u_char *));
void res_close __P((void));
int res_init __P((void));
int res_isourserver __P((const struct sockaddr_in *));
int res_mkquery __P((int, const char *, int, int, const u_char *,
int, const u_char *, u_char *, int));
int res_query __P((const char *, int, int, u_char *, int));
int res_querydomain __P((const char *, const char *, int, int,
u_char *, int));
int res_search __P((const char *, int, int, u_char *, int));
int res_send __P((const u_char *, int, u_char *, int));
__END_DECLS
#endif
#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 */
#define b64_ntop __b64_ntop
#define b64_pton __b64_pton
#define dn_comp __dn_comp
#define dn_count_labels __dn_count_labels
#define dn_expand __dn_expand
#define dn_skipname __dn_skipname
#define fp_resstat __fp_resstat
#define loc_aton __loc_aton
#define loc_ntoa __loc_ntoa
#define p_cdname __p_cdname
#define p_cdnname __p_cdnname
#define p_class __p_class
#define p_fqname __p_fqname
#define p_fqnname __p_fqnname
#define p_option __p_option
#define p_secstodate __p_secstodate
#define p_section __p_section
#define p_time __p_time
#define p_type __p_type
#define p_rcode __p_rcode
#define putlong __putlong
#define putshort __putshort
#define res_dnok __res_dnok
#define res_hnok __res_hnok
#define res_hostalias __res_hostalias
#define res_mailok __res_mailok
#define res_nameinquery __res_nameinquery
#define res_nclose __res_nclose
#define res_ninit __res_ninit
#define res_nmkquery __res_nmkquery
#define res_npquery __res_npquery
#define res_nquery __res_nquery
#define res_nquerydomain __res_nquerydomain
#define res_nsearch __res_nsearch
#define res_nsend __res_nsend
#define res_nisourserver __res_nisourserver
#define res_ownok __res_ownok
#define res_queriesmatch __res_queriesmatch
#define res_randomid __res_randomid
#define sym_ntop __sym_ntop
#define sym_ntos __sym_ntos
#define sym_ston __sym_ston
__BEGIN_DECLS
int res_hnok __P((const char *));
int res_ownok __P((const char *));
int res_mailok __P((const char *));
int res_dnok __P((const char *));
int sym_ston __P((const struct res_sym *, const char *, int *));
const char * sym_ntos __P((const struct res_sym *, int, int *));
const char * sym_ntop __P((const struct res_sym *, int, int *));
int b64_ntop __P((u_char const *, size_t, char *, size_t));
int b64_pton __P((char const *, u_char *, size_t));
int loc_aton __P((const char *ascii, u_char *binary));
const char * loc_ntoa __P((const u_char *binary, char *ascii));
int dn_skipname __P((const u_char *, const u_char *));
void putlong __P((u_int32_t, u_char *));
void putshort __P((u_int16_t, u_char *));
const char * p_class __P((int));
const char * p_time __P((u_int32_t));
const char * p_type __P((int));
const char * p_rcode __P((int));
const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
const u_char * p_fqnname __P((const u_char *cp, const u_char *msg,
int, char *, int));
const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
const char * p_option __P((u_long option));
char * p_secstodate __P((u_long));
int dn_count_labels __P((const char *));
int dn_comp __P((const char *, u_char *, int,
u_char **, u_char **));
int dn_expand __P((const u_char *, const u_char *, const u_char *,
char *, int));
u_int res_randomid __P((void));
int res_nameinquery __P((const char *, int, int,
const u_char *, const u_char *));
int res_queriesmatch __P((const u_char *, const u_char *,
const u_char *, const u_char *));
const char * p_section __P((int section, int opcode));
/* Things involving a resolver context. */
int res_ninit __P((res_state));
int res_nisourserver __P((const res_state,
const struct sockaddr_in *));
void fp_resstat __P((const res_state, FILE *));
void res_npquery __P((const res_state, const u_char *, int, FILE *));
const char * res_hostalias __P((const res_state, const char *,
char *, size_t));
int res_nquery __P((res_state,
const char *, int, int, u_char *, int));
int res_nsearch __P((res_state, const char *, int,
int, u_char *, int));
int res_nquerydomain __P((res_state,
const char *, const char *, int, int,
u_char *, int));
int res_nmkquery __P((res_state,
int, const char *, int, int, const u_char *,
int, const u_char *, u_char *, int));
int res_nsend __P((res_state, const u_char *, int, u_char *, int));
void res_nclose __P((res_state));
__END_DECLS
#endif
#endif /* !_RESOLV_H_ */
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