aboutsummaryrefslogtreecommitdiffstats
path: root/include/resolv.h
blob: 2226c481c7e6ce991058134c1f94ee4c5b9b6273 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
/*-
 * SPDX-License-Identifier: (ISC AND BSD-3-Clause)
 *
 * Portions Copyright (C) 2004, 2005, 2008, 2009  Internet Systems Consortium, Inc. ("ISC")
 * Portions Copyright (C) 1995-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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 (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. 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.
 */

/*%
 *	@(#)resolv.h	8.1 (Berkeley) 6/2/93
 *	$Id: resolv.h,v 1.30 2009/03/03 01:52:48 each Exp $
 * $FreeBSD$
 */

#ifndef _RESOLV_H_
#define	_RESOLV_H_

#include <sys/param.h>
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/socket.h>
#include <stdio.h>
#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	20090302

/*%
 * This used to be defined in res_query.c, now it's in herror.c.
 * [XXX no it's not.  It's in irs/irs_data.c]
 * It was
 * never extern'd by any *.h file before it was placed here.  For thread
 * aware programs, the last h_errno value set is stored in res->h_errno.
 *
 * XXX:	There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
 *	(and __h_errno_set) to the public via <resolv.h>.
 * XXX:	__h_errno_set is really part of IRS, not part of the resolver.
 *	If somebody wants to build and use a resolver that doesn't use IRS,
 *	what do they do?  Perhaps something like
 *		#ifdef WANT_IRS
 *		# define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
 *		#else
 *		# define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
 *		#endif
 */

#define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
struct __res_state; /*%< forward */
__BEGIN_DECLS
void __h_errno_set(struct __res_state *, int);
__END_DECLS

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

#ifndef _PATH_RESCONF
#define	_PATH_RESCONF        "/etc/resolv.conf"
#endif

typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
	res_sendhookact;

typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *,
					  const u_char **, int *,
					  u_char *, int, int *);

typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *,
					  const u_char *, int, u_char *,
					  int, int *);

struct res_sym {
	int		number;	   /*%< Identifying number, like T_MX */
	const char *	name;	   /*%< Its symbolic name, like "MX" */
	const char *	humanname; /*%< Its fun name, like "mail exchanger" */
};

/*%
 * 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_ext;

struct __res_state {
	int	retrans;	 	/*%< retransmission time interval */
	int	retry;			/*%< number of times to retransmit */
	/*
	 * XXX: If `sun' is defined, `options' and `pfcode' are
	 * defined as u_int in original BIND9 distribution.  However,
	 * it breaks binary backward compatibility against FreeBSD's
	 * resolver.  So, we changed not to see `sun'.
	 */
#if defined(sun) && 0
	u_int	options;		/*%< option flags - see below. */
#else
	u_long	options;		/*%< option flags - see below. */
#endif
	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 */
	char	*dnsrch[MAXDNSRCH+1];	/*%< components of domain to search */
	char	defdname[256];		/*%< default domain (deprecated) */
#if defined(sun) && 0
	u_int	pfcode;			/*%< RES_PRF_ flags - see below. */
#else
	u_long	pfcode;			/*%< RES_PRF_ flags - see below. */
#endif
	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;
		u_int32_t	mask;
	} sort_list[MAXRESOLVSORT];
	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 */
	u_int	_pad;			/*%< make _u 64 bit aligned */
	union {
		/* On an 32-bit arch this means 512b total. */
		char	pad[72 - 4*sizeof (int) - 3*sizeof (void *)];
		struct {
			u_int16_t		nscount;
			u_int16_t		nstimes[MAXNS];	/*%< ms. */
			int			nssocks[MAXNS];
			struct __res_state_ext *ext;	/*%< extension for IPv6 */
		} _ext;
	} _u;
	u_char	*_rnd;			/*%< PRIVATE: random state */
};

typedef struct __res_state *res_state;

union res_sockaddr_union {
	struct sockaddr_in	sin;
#ifdef IN6ADDR_ANY_INIT
	struct sockaddr_in6	sin6;
#endif
#ifdef ISC_ALIGN64
	int64_t			__align64;	/*%< 64bit alignment */
#else
	int32_t			__align32;	/*%< 32bit alignment */
#endif
	char			__space[128];   /*%< max size */
};

/*%
 * 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 */
#define	RES_F__UNUSED	0x00000008	/*%< (unused) */
#define	RES_F_LASTMASK	0x000000F0	/*%< ordinal server of last res_nsend */
#define	RES_F_LASTSHIFT	4		/*%< bit position of LASTMASK "flag" */
#define	RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)

/* res_findzonecut2() options */
#define	RES_EXHAUSTIVE	0x00000001	/*%< always do all queries */
#define	RES_IPV4ONLY	0x00000002	/*%< IPv4 only */
#define	RES_IPV6ONLY	0x00000004	/*%< IPv6 only */

/*%
 * 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 truncation 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_NSID	0x00040000      /*%< request name server ID */
#define RES_NOTLDQUERY	0x00100000	/*%< don't unqualified name as a tld */
#define RES_USE_DNSSEC	0x00200000	/*%< use DNSSEC using OK bit in OPT */
/* #define RES_DEBUG2	0x00400000 */	/* nslookup internal */
/* KAME extensions: use higher bit to avoid conflict with ISC use */
#define RES_USE_DNAME	0x10000000	/*%< use DNAME */
#define RES_USE_EDNS0	0x40000000	/*%< use EDNS0 if configured */
#define RES_NO_NIBBLE2	0x80000000	/*%< disable alternate nibble lookup */

#define RES_DEFAULT	(RES_RECURSE | RES_DEFNAMES | \
			 RES_DNSRCH | RES_NO_NIBBLE2)

/*%
 * 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
#define	RES_PRF_TRUNC	0x00008000
/*			0x00010000	*/

/* Things involving an internal (static) resolver context. */
__BEGIN_DECLS
extern struct __res_state *__res_state(void);
__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_opt			__res_opt
#define res_query		__res_query
#define res_querydomain		__res_querydomain
#define res_search		__res_search
#define res_send		__res_send
#define res_sendsigned		__res_sendsigned

__BEGIN_DECLS
void		fp_nquery(const u_char *, int, FILE *);
void		fp_query(const u_char *, FILE *);
const char *	hostalias(const char *);
void		p_query(const u_char *);
void		res_close(void);
int		res_init(void);
int		res_isourserver(const struct sockaddr_in *);
int		res_mkquery(int, const char *, int, int, const u_char *,
				 int, const u_char *, u_char *, int);
int		res_opt(int, u_char *, int, int);
int		res_query(const char *, int, int, u_char *, int);
int		res_querydomain(const char *, const char *, int, int,
				     u_char *, int);
int		res_search(const char *, int, int, u_char *, int);
int		res_send(const u_char *, int, u_char *, int);
int		res_sendsigned(const u_char *, int, ns_tsig_key *,
				    u_char *, int);
__END_DECLS
#endif

#if !defined(SHARED_LIBBIND) || defined(LIB)
/*
 * If libbind is a shared object (well, DLL anyway)
 * these externs break the linker when resolv.h is
 * included by a lib client (like named)
 * Make them go away if a client is including this
 *
 */
extern const struct res_sym __p_key_syms[];
extern const struct res_sym __p_cert_syms[];
extern const struct res_sym __p_class_syms[];
extern const struct res_sym __p_type_syms[];
extern const struct res_sym __p_rcode_syms[];
#endif /* SHARED_LIBBIND */

#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 p_sockun		__p_sockun
#define putlong			__putlong
#define putshort		__putshort
#define res_dnok		__res_dnok
#if 0
#define res_findzonecut		__res_findzonecut
#endif
#define res_findzonecut2	__res_findzonecut2
#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_pquery		__res_pquery
#define res_nquery		__res_nquery
#define res_nquerydomain	__res_nquerydomain
#define res_nsearch		__res_nsearch
#define res_nsend		__res_nsend
#if 0
#define res_nsendsigned		__res_nsendsigned
#endif
#define res_nisourserver	__res_nisourserver
#define res_ownok		__res_ownok
#define res_queriesmatch	__res_queriesmatch
#define res_rndinit		__res_rndinit
#define res_randomid		__res_randomid
#define res_nrandomid		__res_nrandomid
#define sym_ntop		__sym_ntop
#define sym_ntos		__sym_ntos
#define sym_ston		__sym_ston
#define res_nopt		__res_nopt
#define res_nopt_rdata       	__res_nopt_rdata
#define res_ndestroy		__res_ndestroy
#define	res_nametoclass		__res_nametoclass
#define	res_nametotype		__res_nametotype
#define	res_setservers		__res_setservers
#define	res_getservers		__res_getservers
#if 0
#define	res_buildprotolist	__res_buildprotolist
#define	res_destroyprotolist	__res_destroyprotolist
#define	res_destroyservicelist	__res_destroyservicelist
#define	res_get_nibblesuffix	__res_get_nibblesuffix
#define	res_get_nibblesuffix2	__res_get_nibblesuffix2
#endif
#define	res_ourserver_p		__res_ourserver_p
#if 0
#define	res_protocolname	__res_protocolname
#define	res_protocolnumber	__res_protocolnumber
#endif
#define	res_send_setqhook	__res_send_setqhook
#define	res_send_setrhook	__res_send_setrhook
#if 0
#define	res_servicename		__res_servicename
#define	res_servicenumber	__res_servicenumber
#endif
__BEGIN_DECLS
int		res_hnok(const char *);
int		res_ownok(const char *);
int		res_mailok(const char *);
int		res_dnok(const char *);
int		sym_ston(const struct res_sym *, const char *, int *);
const char *	sym_ntos(const struct res_sym *, int, int *);
const char *	sym_ntop(const struct res_sym *, int, int *);
int		b64_ntop(u_char const *, size_t, char *, size_t);
int		b64_pton(char const *, u_char *, size_t);
int		loc_aton(const char *, u_char *);
const char *	loc_ntoa(const u_char *, char *);
int		dn_skipname(const u_char *, const u_char *);
void		putlong(u_int32_t, u_char *);
void		putshort(u_int16_t, u_char *);
#ifndef __ultrix__
u_int16_t	_getshort(const u_char *);
u_int32_t	_getlong(const u_char *);
#endif
const char *	p_class(int);
const char *	p_time(u_int32_t);
const char *	p_type(int);
const char *	p_rcode(int);
const char *	p_sockun(union res_sockaddr_union, char *, size_t);
const u_char *	p_cdnname(const u_char *, const u_char *, int, FILE *);
const u_char *	p_cdname(const u_char *, const u_char *, FILE *);
const u_char *	p_fqnname(const u_char *, const u_char *, int, char *, int);
const u_char *	p_fqname(const u_char *, const u_char *, FILE *);
const char *	p_option(u_long);
char *		p_secstodate(u_long);
int		dn_count_labels(const char *);
int		dn_comp(const char *, u_char *, int, u_char **, u_char **);
int		dn_expand(const u_char *, const u_char *, const u_char *,
			  char *, int);
void		res_rndinit(res_state);
u_int		res_randomid(void);
u_int		res_nrandomid(res_state);
int		res_nameinquery(const char *, int, int, const u_char *,
				const u_char *);
int		res_queriesmatch(const u_char *, const u_char *,
				 const u_char *, const u_char *);
const char *	p_section(int, int);
/* Things involving a resolver context. */
int		res_ninit(res_state);
int		res_nisourserver(const res_state, const struct sockaddr_in *);
void		fp_resstat(const res_state, FILE *);
void		res_pquery(const res_state, const u_char *, int, FILE *);
const char *	res_hostalias(const res_state, const char *, char *, size_t);
int		res_nquery(res_state, const char *, int, int, u_char *, int);
int		res_nsearch(res_state, const char *, int, int, u_char *, int);
int		res_nquerydomain(res_state, const char *, const char *,
				 int, int, u_char *, int);
int		res_nmkquery(res_state, int, const char *, int, int,
			     const u_char *, int, const u_char *,
			     u_char *, int);
int		res_nsend(res_state, const u_char *, int, u_char *, int);
#if 0
int		res_nsendsigned(res_state, const u_char *, int,
				ns_tsig_key *, u_char *, int);
int		res_findzonecut(res_state, const char *, ns_class, int,
				char *, size_t, struct in_addr *, int);
#endif
int		res_findzonecut2(res_state, const char *, ns_class, int,
				 char *, size_t,
				 union res_sockaddr_union *, int);
void		res_nclose(res_state);
int		res_nopt(res_state, int, u_char *, int, int);
int		res_nopt_rdata(res_state, int, u_char *, int, u_char *,
			       u_short, u_short, u_char *);
void		res_send_setqhook(res_send_qhook);
void		res_send_setrhook(res_send_rhook);
int		__res_vinit(res_state, int);
#if 0
void		res_destroyservicelist(void);
const char *	res_servicename(u_int16_t, const char *);
const char *	res_protocolname(int);
void		res_destroyprotolist(void);
void		res_buildprotolist(void);
const char *	res_get_nibblesuffix(res_state);
const char *	res_get_nibblesuffix2(res_state);
#endif
void		res_ndestroy(res_state);
u_int16_t	res_nametoclass(const char *, int *);
u_int16_t	res_nametotype(const char *, int *);
void		res_setservers(res_state, const union res_sockaddr_union *,
			       int);
int		res_getservers(res_state, union res_sockaddr_union *, int);
__END_DECLS

#endif /* !_RESOLV_H_ */
/*! \file */