462 lines
17 KiB
C
462 lines
17 KiB
C
/*
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* Copyright (c) 1983, 1987, 1989
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* @(#)resolv.h 8.1 (Berkeley) 6/2/93
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* $Id$
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*/
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#ifndef _RESOLV_H_
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#define _RESOLV_H_
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#include <sys/param.h>
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#if !defined(__CYGWIN__) && ((!defined(BSD)) || (BSD < 199306))
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# include <sys/bitypes.h>
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#else
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# include <sys/types.h>
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#endif
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#include <sys/cdefs.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <arpa/nameser.h>
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#include <netinet/in.h>
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/*
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* Revision information. This is the release date in YYYYMMDD format.
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* It can change every day so the right thing to do with it is use it
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* in preprocessor commands such as "#if (__RES > 19931104)". Do not
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* compare for equality; rather, use it to determine whether your resolver
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* is new enough to contain a certain feature.
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*/
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#define __RES 19991006
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/*
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* This used to be defined in res_query.c, now it's in herror.c.
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* [XXX no it's not. It's in irs/irs_data.c]
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* It was
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* never extern'd by any *.h file before it was placed here. For thread
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* aware programs, the last h_errno value set is stored in res->h_errno.
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*
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* XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
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* (and __h_errno_set) to the public via <resolv.h>.
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* XXX: __h_errno_set is really part of IRS, not part of the resolver.
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* If somebody wants to build and use a resolver that doesn't use IRS,
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* what do they do? Perhaps something like
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* #ifdef WANT_IRS
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* # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
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* #else
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* # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
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* #endif
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*/
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#define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
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struct __res_state; /* forward */
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__BEGIN_DECLS
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void __h_errno_set(struct __res_state *res, int err);
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__END_DECLS
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/*
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* Resolver configuration file.
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* Normally not present, but may contain the address of the
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* inital name server(s) to query and the domain search list.
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*/
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#ifndef _PATH_RESCONF
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#define _PATH_RESCONF "/etc/resolv.conf"
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#endif
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typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
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res_sendhookact;
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typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr * const *ns,
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const u_char **query,
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int *querylen,
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u_char *ans,
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int anssiz,
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int *resplen));
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typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr *ns,
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const u_char *query,
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int querylen,
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u_char *ans,
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int anssiz,
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int *resplen));
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struct res_sym {
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int number; /* Identifying number, like T_MX */
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const char * name; /* Its symbolic name, like "MX" */
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const char * humanname; /* Its fun name, like "mail exchanger" */
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};
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/*
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* Global defines and variables for resolver stub.
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*/
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#define MAXNS 3 /* max # name servers we'll track */
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#define MAXDFLSRCH 3 /* # default domain levels to try */
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#define MAXDNSRCH 6 /* max # domains in search path */
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#define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
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#define RES_TIMEOUT 5 /* min. seconds between retries */
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#define MAXRESOLVSORT 10 /* number of net to sort on */
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#define RES_MAXNDOTS 15 /* should reflect bit field size */
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#define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
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#define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
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#define RES_DFLRETRY 2 /* Default #/tries. */
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#define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
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struct __res_state_ext;
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struct __res_state {
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int retrans; /* retransmition time interval */
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int retry; /* number of times to retransmit */
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u_long options; /* option flags - see below. */
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int nscount; /* number of name servers */
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struct sockaddr_in
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nsaddr_list[MAXNS]; /* address of name server */
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#define nsaddr nsaddr_list[0] /* for backward compatibility */
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u_short id; /* current message id */
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char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
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char defdname[256]; /* default domain (deprecated) */
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u_long pfcode; /* RES_PRF_ flags - see below. */
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unsigned ndots:4; /* threshold for initial abs. query */
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unsigned nsort:4; /* number of elements in sort_list[] */
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char unused[3];
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struct {
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struct in_addr addr;
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u_int32_t mask;
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} sort_list[MAXRESOLVSORT];
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res_send_qhook qhook; /* query hook */
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res_send_rhook rhook; /* response hook */
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int res_h_errno; /* last one set for this context */
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int _vcsock; /* PRIVATE: for res_send VC i/o */
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u_int _flags; /* PRIVATE: see below */
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union {
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/* On an 32-bit arch this means 512b total. */
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char pad[72 - 3*sizeof (int) - 2*sizeof (void *)];
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struct {
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u_int16_t nscount;
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u_int16_t nstimes[MAXNS]; /* ms. */
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int nssocks[MAXNS];
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struct __res_state_ext *ext; /* extention for IPv6 */
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} _ext;
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} _u;
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};
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typedef struct __res_state *res_state;
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union res_sockaddr_union {
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struct sockaddr_in sin;
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#ifdef IN6ADDR_ANY_INIT
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struct sockaddr_in6 sin6;
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#endif
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#ifdef ISC_ALIGN64
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int64_t __align; /* 64bit alignment */
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#else
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int32_t __align; /* 32bit alignment */
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#endif
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char __space[128]; /* max size */
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};
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/*
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* Resolver flags (used to be discrete per-module statics ints).
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*/
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#define RES_F_VC 0x00000001 /* socket is TCP */
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#define RES_F_CONN 0x00000002 /* socket is connected */
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#define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */
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/* res_findzonecut() options */
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#define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
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/*
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* Resolver options (keep these in synch with res_debug.c, please)
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*/
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#define RES_INIT 0x00000001 /* address initialized */
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#define RES_DEBUG 0x00000002 /* print debug messages */
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#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
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#define RES_USEVC 0x00000008 /* use virtual circuit */
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#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
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#define RES_IGNTC 0x00000020 /* ignore trucation errors */
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#define RES_RECURSE 0x00000040 /* recursion desired */
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#define RES_DEFNAMES 0x00000080 /* use default domain name */
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#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
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#define RES_DNSRCH 0x00000200 /* search up local domain tree */
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#define RES_INSECURE1 0x00000400 /* type 1 security disabled */
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#define RES_INSECURE2 0x00000800 /* type 2 security disabled */
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#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
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#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
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#define RES_ROTATE 0x00004000 /* rotate ns list after each query */
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#define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
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#define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
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#define RES_BLAST 0x00020000 /* blast all recursive servers */
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#define RES_NO_NIBBLE 0x00040000 /* disable IPv6 nibble mode reverse */
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#define RES_NO_BITSTRING 0x00080000 /* disable IPv6 bit string mode reverse */
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/* KAME extensions: use higher bit to avoid conflict with ISC use */
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#define RES_USE_DNAME 0x10000000 /* use DNAME */
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#define RES_USE_A6 0x20000000 /* use A6 */
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#define RES_USE_EDNS0 0x40000000 /* use EDNS0 if configured */
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#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
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/*
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* Resolver "pfcode" values. Used by dig.
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*/
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#define RES_PRF_STATS 0x00000001
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#define RES_PRF_UPDATE 0x00000002
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#define RES_PRF_CLASS 0x00000004
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#define RES_PRF_CMD 0x00000008
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#define RES_PRF_QUES 0x00000010
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#define RES_PRF_ANS 0x00000020
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#define RES_PRF_AUTH 0x00000040
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#define RES_PRF_ADD 0x00000080
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#define RES_PRF_HEAD1 0x00000100
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#define RES_PRF_HEAD2 0x00000200
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#define RES_PRF_TTLID 0x00000400
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#define RES_PRF_HEADX 0x00000800
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#define RES_PRF_QUERY 0x00001000
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#define RES_PRF_REPLY 0x00002000
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#define RES_PRF_INIT 0x00004000
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/* 0x00008000 */
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/* Things involving an internal (static) resolver context. */
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#if defined(_REENTRANT) || defined(__CYGWIN__)
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__BEGIN_DECLS
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extern struct __res_state *__res_state(void);
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__END_DECLS
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#define _res (*__res_state())
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#else
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#ifndef __BIND_NOSTATIC
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extern struct __res_state _res;
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#endif
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#endif
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#ifndef __BIND_NOSTATIC
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#define fp_nquery __fp_nquery
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#define fp_query __fp_query
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#define hostalias __hostalias
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#define p_query __p_query
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#define res_close __res_close
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#define res_init __res_init
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#define res_isourserver __res_isourserver
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#define res_mkquery __res_mkquery
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#define res_query __res_query
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#define res_querydomain __res_querydomain
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#define res_search __res_search
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#define res_send __res_send
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#define res_sendsigned __res_sendsigned
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__BEGIN_DECLS
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void fp_nquery __P((const u_char *, int, FILE *));
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void fp_query __P((const u_char *, FILE *));
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const char * hostalias __P((const char *));
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void p_query __P((const u_char *));
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void res_close __P((void));
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int res_init __P((void));
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int res_isourserver __P((const struct sockaddr_in *));
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int res_mkquery __P((int, const char *, int, int, const u_char *,
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int, const u_char *, u_char *, int));
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int res_query __P((const char *, int, int, u_char *, int));
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int res_querydomain __P((const char *, const char *, int, int,
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u_char *, int));
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int res_search __P((const char *, int, int, u_char *, int));
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int res_send __P((const u_char *, int, u_char *, int));
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int res_sendsigned __P((const u_char *, int, ns_tsig_key *,
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u_char *, int));
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__END_DECLS
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#endif
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#if !defined(SHARED_LIBBIND) || defined(LIB)
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/*
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* If libbind is a shared object (well, DLL anyway)
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* these externs break the linker when resolv.h is
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* included by a lib client (like named)
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* Make them go away if a client is including this
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*
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*/
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extern const struct res_sym __p_key_syms[];
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extern const struct res_sym __p_cert_syms[];
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extern const struct res_sym __p_class_syms[];
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extern const struct res_sym __p_type_syms[];
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extern const struct res_sym __p_rcode_syms[];
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#endif /* SHARED_LIBBIND */
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#define b64_ntop __b64_ntop
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#define b64_pton __b64_pton
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#define dn_comp __dn_comp
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#define dn_count_labels __dn_count_labels
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#define dn_expand __dn_expand
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#define dn_skipname __dn_skipname
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#define fp_resstat __fp_resstat
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#define loc_aton __loc_aton
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#define loc_ntoa __loc_ntoa
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#define p_cdname __p_cdname
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#define p_cdnname __p_cdnname
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#define p_class __p_class
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#define p_fqname __p_fqname
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#define p_fqnname __p_fqnname
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#define p_option __p_option
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#define p_secstodate __p_secstodate
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#define p_section __p_section
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#define p_time __p_time
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#define p_type __p_type
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#define p_rcode __p_rcode
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#define putlong __putlong
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#define putshort __putshort
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#define res_dnok __res_dnok
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#define res_findzonecut __res_findzonecut
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#define res_hnok __res_hnok
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#define res_hostalias __res_hostalias
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#define res_mailok __res_mailok
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#define res_nameinquery __res_nameinquery
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#define res_nclose __res_nclose
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#define res_ninit __res_ninit
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#define res_nmkquery __res_nmkquery
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#define res_pquery __res_pquery
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#define res_nquery __res_nquery
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#define res_nquerydomain __res_nquerydomain
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#define res_nsearch __res_nsearch
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#define res_nsend __res_nsend
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#define res_nsendsigned __res_nsendsigned
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#define res_nisourserver __res_nisourserver
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#define res_ownok __res_ownok
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#define res_queriesmatch __res_queriesmatch
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#define res_randomid __res_randomid
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#define sym_ntop __sym_ntop
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#define sym_ntos __sym_ntos
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#define sym_ston __sym_ston
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#define res_nopt __res_nopt
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#define res_ndestroy __res_ndestroy
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#define res_nametoclass __res_nametoclass
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#define res_nametotype __res_nametotype
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#define res_setservers __res_setservers
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#define res_getservers __res_getservers
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__BEGIN_DECLS
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int res_hnok __P((const char *));
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int res_ownok __P((const char *));
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int res_mailok __P((const char *));
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int res_dnok __P((const char *));
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int sym_ston __P((const struct res_sym *, const char *, int *));
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const char * sym_ntos __P((const struct res_sym *, int, int *));
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const char * sym_ntop __P((const struct res_sym *, int, int *));
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int b64_ntop __P((u_char const *, size_t, char *, size_t));
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int b64_pton __P((char const *, u_char *, size_t));
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int loc_aton __P((const char *ascii, u_char *binary));
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const char * loc_ntoa __P((const u_char *binary, char *ascii));
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int dn_skipname __P((const u_char *, const u_char *));
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void putlong __P((u_int32_t, u_char *));
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void putshort __P((u_int16_t, u_char *));
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const char * p_class __P((int));
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const char * p_time __P((u_int32_t));
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const char * p_type __P((int));
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const char * p_rcode __P((int));
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const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
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const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
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const u_char * p_fqnname __P((const u_char *cp, const u_char *msg,
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int, char *, int));
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const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
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const char * p_option __P((u_long option));
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char * p_secstodate __P((u_long));
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int dn_count_labels __P((const char *));
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int dn_comp __P((const char *, u_char *, int,
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u_char **, u_char **));
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int dn_expand __P((const u_char *, const u_char *, const u_char *,
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char *, int));
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u_int res_randomid __P((void));
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int res_nameinquery __P((const char *, int, int,
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const u_char *, const u_char *));
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int res_queriesmatch __P((const u_char *, const u_char *,
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const u_char *, const u_char *));
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const char * p_section __P((int section, int opcode));
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/* Things involving a resolver context. */
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int res_ninit __P((res_state));
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int res_nisourserver __P((const res_state,
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const struct sockaddr_in *));
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void fp_resstat __P((const res_state, FILE *));
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void res_pquery __P((const res_state, const u_char *, int, FILE *));
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const char * res_hostalias __P((const res_state, const char *,
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char *, size_t));
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int res_nquery __P((res_state,
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const char *, int, int, u_char *, int));
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int res_nsearch __P((res_state, const char *, int,
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int, u_char *, int));
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int res_nquerydomain __P((res_state,
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const char *, const char *, int, int,
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u_char *, int));
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int res_nmkquery __P((res_state,
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int, const char *, int, int, const u_char *,
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int, const u_char *, u_char *, int));
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int res_nsend __P((res_state, const u_char *, int, u_char *, int));
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int res_nsendsigned __P((res_state, const u_char *, int,
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ns_tsig_key *, u_char *, int));
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int res_findzonecut __P((res_state, const char *, ns_class, int,
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char *, size_t, struct in_addr *, int));
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void res_nclose __P((res_state));
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int res_nopt __P((res_state, int, u_char *, int, int));
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void res_send_setqhook __P((res_send_qhook hook));
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void res_send_setrhook __P((res_send_rhook hook));
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int __res_vinit __P((res_state, int));
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void res_destroyservicelist __P((void));
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const char * res_servicename __P((u_int16_t port, const char *proto));
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const char * res_protocolname __P((int num));
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void res_destroyprotolist __P((void));
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void res_buildprotolist __P((void));
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const char * res_get_nibblesuffix __P((res_state));
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const char * res_get_bitstringsuffix __P((res_state));
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void res_ndestroy __P((res_state));
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u_int16_t res_nametoclass __P((const char *buf, int *success));
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u_int16_t res_nametotype __P((const char *buf, int *success));
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void res_setservers __P((res_state,
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const union res_sockaddr_union *, int));
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int res_getservers __P((res_state,
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|
union res_sockaddr_union *, int));
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__END_DECLS
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#endif /* !_RESOLV_H_ */
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