resolv.h
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上传日期:2007-04-14
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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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 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.
- *
- * from: @(#)resolv.h 5.15 (Berkeley) 4/3/91
- * $Id$
- */
- #ifndef _RESOLV_H_
- #define _RESOLV_H_
- #include <netinet/in.h>
- /*
- * This is specificly for Solaris which defines NOERROR in the streams
- * header files and defines it differently than in arpa/nameser.h
- */
- #ifdef NOERROR
- #undef NOERROR
- #endif
- #include <arpa/nameser.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 19940703
- /*
- * 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
- /*
- * Global defines and variables for resolver stub.
- */
- #define MAXNS 3 /* max # name servers we'll track */
- #define MAXDFLSRCH 3 /* # default domain levels to try */
- #define MAXDNSRCH 6 /* max # domains in search path */
- #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
- #define MAXDNSLUS 4 /* max # of host lookup types */
- #define RES_TIMEOUT 5 /* min. seconds between retries */
- #define MAXRESOLVSORT 10 /* number of net to sort on */
- #define RES_MAXNDOTS 15 /* should reflect bit field size */
- struct __res_state {
- int retrans; /* retransmition time interval */
- int retry; /* number of times to retransmit */
- 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 packet id */
- char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
- char defdname[MAXDNAME]; /* default domain */
- long pfcode; /* RES_PRF_ flags - see below. */
- u_char ndots:4; /* threshold for initial abs. query */
- u_char nsort:4; /* number of elements in sort_list[] */
- char unused[3];
- struct {
- struct in_addr addr;
- u_long mask;
- } sort_list[MAXRESOLVSORT];
- char lookups[MAXDNSLUS];
- };
- /*
- * Resolver options
- */
- #define RES_INIT 0x0001 /* address initialized */
- #define RES_DEBUG 0x0002 /* print debug messages */
- #define RES_AAONLY 0x0004 /* authoritative answers only */
- #define RES_USEVC 0x0008 /* use virtual circuit */
- #define RES_PRIMARY 0x0010 /* query primary server only */
- #define RES_IGNTC 0x0020 /* ignore trucation errors */
- #define RES_RECURSE 0x0040 /* recursion desired */
- #define RES_DEFNAMES 0x0080 /* use default domain name */
- #define RES_STAYOPEN 0x0100 /* Keep TCP socket open */
- #define RES_DNSRCH 0x0200 /* search up local domain tree */
- #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
- /*
- * Resolver "pfcode" values. Used by dig.
- */
- #define RES_PRF_STATS 0x0001
- /* 0x0002 */
- #define RES_PRF_CLASS 0x0004
- #define RES_PRF_CMD 0x0008
- #define RES_PRF_QUES 0x0010
- #define RES_PRF_ANS 0x0020
- #define RES_PRF_AUTH 0x0040
- #define RES_PRF_ADD 0x0080
- #define RES_PRF_HEAD1 0x0100
- #define RES_PRF_HEAD2 0x0200
- #define RES_PRF_TTLID 0x0400
- #define RES_PRF_HEADX 0x0800
- #define RES_PRF_QUERY 0x1000
- #define RES_PRF_REPLY 0x2000
- #define RES_PRF_INIT 0x4000
- /* 0x8000 */
- #define _res (*_res_status())
- #define h_errno (_res_get_error())
- #include <sys/cdefs.h>
- #include <stdio.h>
- /* Private routines shared between libc/net, named, nslookup and others. */
- #define dn_skipname __dn_skipname
- #define fp_query __fp_query
- #define hostalias __hostalias
- #define putlong __putlong
- #define putshort __putshort
- #define p_class __p_class
- #define p_time __p_time
- #define p_type __p_type
- __BEGIN_DECLS
- struct __res_state *_res_status __P_((void));
- int _res_get_error __P_((void));
- int __dn_skipname __P_((const u_char *, const u_char *));
- void __fp_query __P_((char *, FILE *));
- char *__hostalias __P_((const char *));
- void __putlong __P_((pthread_ipaddr_type, unsigned char *));
- void __putshort __P_((pthread_ipport_type, unsigned char *));
- char *__p_class __P_((int));
- char *__p_time __P_((unsigned long));
- char *__p_type __P_((int));
- int dn_comp __P_((const unsigned char *, unsigned char *, int,
- unsigned char **, unsigned char **));
- int dn_expand __P_((const unsigned char *, const unsigned char *,
- const unsigned char *, unsigned char *, int));
- int res_init __P_((void));
- int res_mkquery __P_((int, const char *, int, int, const char *, int,
- const char *, char *, int));
- int res_send __P_((const char *, int, char *, int));
- __END_DECLS
- #endif /* !_RESOLV_H_ */