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aef16cc8a4
This commit enhances the stub resolver to reload the configuration in the per-thread _res object if the /etc/resolv.conf file has changed. The resolver checks whether the application has modified _res and will not overwrite the _res object in that case. The struct resolv_context mechanism is used to check the configuration file only once per name lookup.
307 lines
12 KiB
C
307 lines
12 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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* 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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* $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
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*/
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#ifndef _RESOLV_H_
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#define _RESOLV_H_
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <bits/types/res_state.h>
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/*
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* Global defines and variables for resolver stub.
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*/
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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 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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#define nsaddr nsaddr_list[0] /* for backward compatibility */
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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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* 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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struct res_sym {
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int number; /* Identifying number, like T_MX */
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char * name; /* Its symbolic name, like "MX" */
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char * humanname; /* Its fun name, like "mail exchanger" */
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};
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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 \
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__glibc_macro_warning ("RES_AAONLY is deprecated") 0x00000004
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#define RES_USEVC 0x00000008 /* use virtual circuit */
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#define RES_PRIMARY \
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__glibc_macro_warning ("RES_PRIMARY is deprecated") 0x00000010
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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 \
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__glibc_macro_warning ("RES_USE_INET6 is deprecated") 0x00002000
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#define RES_ROTATE 0x00004000 /* rotate ns list after each query */
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#define RES_NOCHECKNAME \
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__glibc_macro_warning ("RES_NOCHECKNAME is deprecated") 0x00008000
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#define RES_KEEPTSIG \
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__glibc_macro_warning ("RES_KEEPTSIG is deprecated") 0x00010000
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#define RES_BLAST \
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__glibc_macro_warning ("RES_BLAST is deprecated") 0x00020000
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#define RES_USE_EDNS0 0x00100000 /* Use EDNS0. */
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#define RES_SNGLKUP 0x00200000 /* one outstanding request at a time */
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#define RES_SNGLKUPREOP 0x00400000 /* -"-, but open new socket for each
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request */
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#define RES_USE_DNSSEC 0x00800000 /* use DNSSEC using OK bit in OPT */
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#define RES_NOTLDQUERY 0x01000000 /* Do not look up unqualified name
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as a TLD. */
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#define RES_NORELOAD 0x02000000 /* No automatic configuration reload. */
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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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__BEGIN_DECLS
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extern struct __res_state *__res_state(void) __attribute__ ((__const__));
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__END_DECLS
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#define _res (*__res_state())
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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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__BEGIN_DECLS
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void fp_nquery (const unsigned char *, int, FILE *) __THROW;
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void fp_query (const unsigned char *, FILE *) __THROW;
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const char * hostalias (const char *) __THROW;
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void p_query (const unsigned char *) __THROW;
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void res_close (void) __THROW;
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int res_init (void) __THROW;
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int res_isourserver (const struct sockaddr_in *) __THROW;
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int res_mkquery (int, const char *, int, int,
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const unsigned char *, int, const unsigned char *,
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unsigned char *, int) __THROW;
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int res_query (const char *, int, int, unsigned char *, int)
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__THROW;
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int res_querydomain (const char *, const char *, int, int,
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unsigned char *, int) __THROW;
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int res_search (const char *, int, int, unsigned char *, int)
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__THROW;
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int res_send (const unsigned char *, int, unsigned char *, int)
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__THROW;
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__END_DECLS
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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_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_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_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_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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__BEGIN_DECLS
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int res_hnok (const char *) __THROW;
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int res_ownok (const char *) __THROW;
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int res_mailok (const char *) __THROW;
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int res_dnok (const char *) __THROW;
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int sym_ston (const struct res_sym *, const char *, int *) __THROW;
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const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
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const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
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int b64_ntop (const unsigned char *, size_t, char *, size_t)
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__THROW;
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int b64_pton (char const *, unsigned char *, size_t) __THROW;
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int loc_aton (const char *__ascii, unsigned char *__binary) __THROW;
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const char * loc_ntoa (const unsigned char *__binary, char *__ascii) __THROW;
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int dn_skipname (const unsigned char *, const unsigned char *)
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__THROW;
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void putlong (uint32_t, unsigned char *) __THROW;
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void putshort (uint16_t, unsigned char *) __THROW;
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const char * p_class (int) __THROW;
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const char * p_time (uint32_t) __THROW;
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const char * p_type (int) __THROW;
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const char * p_rcode (int) __THROW;
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const unsigned char * p_cdnname (const unsigned char *,
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const unsigned char *, int, FILE *) __THROW;
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const unsigned char * p_cdname (const unsigned char *, const unsigned char *,
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FILE *) __THROW;
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const unsigned char * p_fqnname (const unsigned char *__cp,
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const unsigned char *__msg,
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int, char *, int) __THROW;
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const unsigned char * p_fqname (const unsigned char *,
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const unsigned char *, FILE *) __THROW;
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const char * p_option (unsigned long __option) __THROW;
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char * p_secstodate (unsigned long) __THROW;
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int dn_count_labels (const char *) __THROW;
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int dn_comp (const char *, unsigned char *, int, unsigned char **,
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unsigned char **) __THROW;
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int dn_expand (const unsigned char *, const unsigned char *,
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const unsigned char *, char *, int) __THROW;
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unsigned int res_randomid (void) __THROW;
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int res_nameinquery (const char *, int, int,
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const unsigned char *,
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const unsigned char *) __THROW;
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int res_queriesmatch (const unsigned char *,
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const unsigned char *,
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const unsigned char *,
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const unsigned char *) __THROW;
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/* Things involving a resolver context. */
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int res_ninit (res_state) __THROW;
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void fp_resstat (const res_state, FILE *) __THROW;
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const char * res_hostalias (const res_state, const char *, char *, size_t)
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__THROW;
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int res_nquery (res_state, const char *, int, int,
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unsigned char *, int) __THROW;
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int res_nsearch (res_state, const char *, int, int,
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unsigned char *, int) __THROW;
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int res_nquerydomain (res_state, const char *, const char *, int,
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int, unsigned char *, int) __THROW;
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int res_nmkquery (res_state, int, const char *, int, int,
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const unsigned char *, int,
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const unsigned char *, unsigned char *, int)
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__THROW;
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int res_nsend (res_state, const unsigned char *, int,
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unsigned char *, int) __THROW;
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void res_nclose (res_state) __THROW;
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__END_DECLS
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#endif /* !_RESOLV_H_ */
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