resolv.h

用于嵌入式系统的TCP/IP协议栈及若干服务

/*
*            Copyright (c) 1998-2001 by NETsilicon Inc.
*
*  This software is copyrighted by and is the sole property of
*  NETsilicon.  All rights, title, ownership, or other interests
*  in the software remain the property of NETsilicon.  This
*  software may only be used in accordance with the corresponding
*  license agreement.  Any unauthorized use, duplication, transmission,
*  distribution, or disclosure of this software is expressly forbidden.
*
*  This Copyright notice may not be removed or modified without prior
*  written consent of NETsilicon.
*
*  NETsilicon, reserves the right to modify this software
*  without notice.
*
*  NETsilicon
*  411 Waverley Oaks Road                  USA 781.647.1234
*  Suite 227                               http://www.netsilicon.com
*  Waltham, MA 02452                       [e-mail]
*
*************************************************************************
*  $Name: Fusion 6.52 Fusion 6.51 $
*  $Date: 2001/09/19 10:34:45 $
*  $Source: M:/psisrc/dns_rslv/incl/rcs/resolv.h $
*  $Revision: 1.8 $
*************************************************************************
*                         - Revision Log -                              *
* Who   When        Why
*
* FND   11/30/01    Add os_printf() prototype.
*
**************************************************************************
*
* DNS Resolver include file
*
*************************************************************************/
/*
 * ++Copyright++ 1983, 1987, 1989, 1993
 * -
 * Copyright (c) 1983, 1987, 1989, 1993
 *    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.
 * -
 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
 * 
 * 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, and that
 * the name of Digital Equipment Corporation not be used in advertising or
 * publicity pertaining to distribution of the document or software without
 * specific, written prior permission.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
 * CORPORATION 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.
 * -
 * --Copyright--
 */

/*
 *	@(#)resolv.h	8.1 (Berkeley) 6/2/93
 *	$Id: resolv.h 1.8 2001/09/19 10:34:45 mtaylor Release $
 */

#ifndef _RESOLV_H_
#define	_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	19960229

/*
 * Resolver configuration file.
 * Normally not present, but may contain the address of the
 * inital name server(s) to query and the domain search list.
 */

/*
 * 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 */

typedef struct DNS_SERVER {
    struct DNS_SERVER *p_previous;
    struct DNS_SERVER *p_next;
    int timeout;
    struct in_sockaddr nsaddr;  /* address of name server */
} DNS_SERVER;


struct __res_state {
	int	retry;			/* number of times to retransmit */
	u32	options;		/* option flags - see below. */
	u16	id;			/* current packet id */
	char	*dnsrch[MAXDNSRCH+1];	/* components of domain to search */
	char	defdname[MAXDNAME];	/* default domain */
	u32	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;
		u32	mask;
	} sort_list[MAXRESOLVSORT];
	char	pad[72];		/* On an i38this means 512b total. */
};

/*
 * 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_DEFAULT	(RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)

/*
 * Resolver "pfcode" values.  Used by dig.
 */
#define RES_PRF_STATS	0x00000001
/*			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	*/

/* hooks are still experimental as of 4.9.2 */
typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
	res_sendhookact;

typedef res_sendhookact (*res_send_qhook)(struct in_sockaddr * const *ns,
					      const u8 **query,
					      int *querylen,
					      u8 *ans,
					      int anssiz,
					      int *resplen);

typedef res_sendhookact (*res_send_rhook)(const struct in_sockaddr *ns,
					      const u8 *query,
					      int querylen,
					      u8 *ans,
					      int anssiz,
					      int *resplen);

extern struct __res_state _res;

extern int	name_servers;		    /* number of name servers */
extern DNS_SERVER *p_name_server_list;   /* pointer to name server structures */


/* Private routines shared between libc/net, named, nslookup and others. */
#define	res_hnok	__res_hnok
#define	res_ownok	__res_ownok
#define	res_mailok	__res_mailok
#define	res_dnok	__res_dnok
#define	loc_ntoa	__loc_ntoa
#define	loc_aton	__loc_aton
#define	dn_skipname	__dn_skipname
#define	fp_query	__fp_query
#define	fp_nquery	__fp_nquery
#define	hostalias	__hostalias
#define p_class		__p_class
#define p_time		__p_time
#define p_type		__p_type
#define	p_cdnname	__p_cdnname
#define	p_cdname	__p_cdname
#define	p_fqname	__p_fqname
#define	p_rr		__p_rr
#define	p_option	__p_option
#define	res_randomid	__res_randomid
#define	res_isourserver	__res_isourserver
#define	res_nameinquery	__res_nameinquery
#define	res_queriesmatch __res_queriesmatch

int	 __res_hnok (const char *);
int	 __res_ownok (const char *);
int	 __res_mailok (const char *);
int	 __res_dnok (const char *);
int	 __loc_aton (const char *ascii, u8 *binary);
char *	 __loc_ntoa (const u8 *binary, char *ascii);
int	 __dn_skipname (const u8 *, const u8 *);
void	 __fp_resstat (struct __res_state *);
void	 __fp_query (const u8 *);
void	 __fp_nquery (const u8 *, int);
char	*__hostalias (const char *);
char	*__p_time (u32);
void	 __p_query (const u8 *);
const u8 *__p_cdnname (const u8 *, const u8 *, int len);
const u8 *__p_cdname (const u8 *, const u8 *);
const u8 *__p_fqname (const u8 *, const u8 *);
const u8 *__p_rr (const u8 *, const u8 *);
const char *__p_type (int);
const char *__p_class (int);
const char *__p_option (u32 option);
int	 dn_comp (const char *, u8 *, int, u8 **, u8 **);
int	 dn_expand (const u8 *, const u8 *, const u8 *,
			char *, int);
int	 res_init (void);
u16 res_randomid (void);
int	 res_query (const char *, int, int, u8 *, int);
int	 res_search (const char *, int, int, u8 *, int);
int	 res_querydomain (const char *, const char *, int, int,
			      u8 *, int);
int	 res_mkquery (int, const char *, int, int, const u8 *, int,
			  const u8 *, u8 *, int);
int	 res_send (const u8 *, int, u8 *, int);
int	 res_isourserver (const struct in_sockaddr *);
int	 res_nameinquery (const char *, int, int,
			      const u8 *, const u8 *);
int	 res_queriesmatch (const u8 *, const u8 *,
			       const u8 *, const u8 *);

int fns_strncasecmp(const char *s1, const char *s2, int n );
int fns_strcasecmp(const char *s1, const char *s2 );
void syslog(int flags, char *p_param,...);
int inet_pton(int af, const char *src, void *dst );


#ifdef DEBUG
import int dns_rslv_debug;
#endif

#ifdef TRACE
import int dns_rslv_trace;
#endif

/* Name Server List Locking Mechanism */

#ifndef USE_NAME_SERVER_LOCK
#define USE_NAME_SERVER_LOCK int dns_lock
#endif

#ifndef LOCK_NAME_SERVER
#define LOCK_NAME_SERVER    dns_lock = os_critical()
#endif

#ifndef UNLOCK_NAME_SERVER
#define UNLOCK_NAME_SERVER  os_normal(dns_lock)
#endif


/* Debug Macros */

#ifdef DNS_DEBUG
#ifndef os_printf
import  void    os_printf(char * msg,...);
#endif
#define DNS_DEBUG0(s)       os_printf(s)
#define DNS_DEBUG1(s,x)     os_printf(s,x)
#define DNS_DEBUG2(s,x,y)   os_printf(s,x,y)
#define DNS_DEBUG3(s,x,y,z) os_printf(s,x,y,z)
#define DNS_DEBUG4(s,w,x,y,z) os_printf(s,w,x,y,z)
#else
#define DNS_DEBUG0(s)
#define DNS_DEBUG1(s,x)
#define DNS_DEBUG2(s,x,y)
#define DNS_DEBUG3(s,x,y,z)
#define DNS_DEBUG4(s,w,x,y,z)
#endif


#endif /* !_RESOLV_H_ */