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glibc/resolv/resolv.h
Ulrich Drepper 44d20bca52 Implement second fallback mode for DNS requests. 
There is some more shardware/software out there which has problems
if two DNS requests are sent using the same tuple

  (source addr, source port, dest addr, dest port)

This can range from firewalls to load balancers.  Some of the vendors
already fixed it in response to this problem.  Still, we need a way
to make glibc work with broken environments.  The single-request-reopen
flag can be used or we fall back automatically to this mode.
2009-06-26 03:47:47 -07:00

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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_
/* These headers are needed for types used in the `struct res_state'
declaration. */
#include <sys/types.h>
#include <netinet/in.h>
#ifndef __need_res_state
# define _RESOLV_H_
# include <sys/param.h>
# include <sys/cdefs.h>
# include <stdio.h>
# include <arpa/nameser.h>
#endif
#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 */
/* 2 byte hole here. */
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[] */
unsigned ipv6_unavail:1; /* connecting to IPv6 server failed */
unsigned unused:23;
struct {
struct in_addr addr;
u_int32_t mask;
} sort_list[MAXRESOLVSORT];
/* 4 byte hole here on 64-bit architectures. */
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 */
/* 4 byte hole here on 64-bit architectures. */
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];
#ifdef _LIBC
unsigned long long int initstamp
__attribute__((packed));
#else
unsigned int _initstamp[2];
#endif
} _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 */
#define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */
/* 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_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte
strings */
#define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
reverse lookup */
#define RES_USE_EDNS0 0x00100000 /* Use EDNS0. */
#define RES_SNGLKUP 0x00200000 /* one outstanding request at a time */
#define RES_SNGLKUPREOP 0x00400000 /* -"-, but open new socket for each
request */
#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
/*
* 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. */
__BEGIN_DECLS
extern struct __res_state *__res_state(void) __attribute__ ((__const__));
__END_DECLS
#define _res (*__res_state())
#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 (const u_char *, int, FILE *) __THROW;
void fp_query (const u_char *, FILE *) __THROW;
const char * hostalias (const char *) __THROW;
void p_query (const u_char *) __THROW;
void res_close (void) __THROW;
int res_init (void) __THROW;
int res_isourserver (const struct sockaddr_in *) __THROW;
int res_mkquery (int, const char *, int, int, const u_char *,
int, const u_char *, u_char *, int) __THROW;
int res_query (const char *, int, int, u_char *, int) __THROW;
int res_querydomain (const char *, const char *, int, int,
u_char *, int) __THROW;
int res_search (const char *, int, int, u_char *, int) __THROW;
int res_send (const u_char *, int, u_char *, int) __THROW;
__END_DECLS
#endif
#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 (const char *) __THROW;
int res_ownok (const char *) __THROW;
int res_mailok (const char *) __THROW;
int res_dnok (const char *) __THROW;
int sym_ston (const struct res_sym *, const char *, int *) __THROW;
const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
int b64_pton (char const *, u_char *, size_t) __THROW;
int loc_aton (const char *__ascii, u_char *__binary) __THROW;
const char * loc_ntoa (const u_char *__binary, char *__ascii) __THROW;
int dn_skipname (const u_char *, const u_char *) __THROW;
void putlong (u_int32_t, u_char *) __THROW;
void putshort (u_int16_t, u_char *) __THROW;
const char * p_class (int) __THROW;
const char * p_time (u_int32_t) __THROW;
const char * p_type (int) __THROW;
const char * p_rcode (int) __THROW;
const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
__THROW;
const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
const u_char * p_fqnname (const u_char *__cp, const u_char *__msg,
int, char *, int) __THROW;
const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
const char * p_option (u_long __option) __THROW;
char * p_secstodate (u_long) __THROW;
int dn_count_labels (const char *) __THROW;
int dn_comp (const char *, u_char *, int, u_char **, u_char **)
__THROW;
int dn_expand (const u_char *, const u_char *, const u_char *,
char *, int) __THROW;
u_int res_randomid (void) __THROW;
int res_nameinquery (const char *, int, int,
const u_char *, const u_char *) __THROW;
int res_queriesmatch (const u_char *, const u_char *,
const u_char *, const u_char *) __THROW;
const char * p_section (int __section, int __opcode) __THROW;
/* Things involving a resolver context. */
int res_ninit (res_state) __THROW;
int res_nisourserver (const res_state,
const struct sockaddr_in *) __THROW;
void fp_resstat (const res_state, FILE *) __THROW;
void res_npquery (const res_state, const u_char *, int, FILE *)
__THROW;
const char * res_hostalias (const res_state, const char *, char *, size_t)
__THROW;
int res_nquery (res_state, const char *, int, int, u_char *, int)
__THROW;
int res_nsearch (res_state, const char *, int, int, u_char *, int)
__THROW;
int res_nquerydomain (res_state, const char *, const char *, int,
int, u_char *, int) __THROW;
int res_nmkquery (res_state, int, const char *, int, int,
const u_char *, int, const u_char *, u_char *,
int) __THROW;
int res_nsend (res_state, const u_char *, int, u_char *, int)
__THROW;
void res_nclose (res_state) __THROW;
__END_DECLS
#endif
#endif /* !_RESOLV_H_ */
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