2 * Copyright (c) 1983, 1987, 1989
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * Portions Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
36 * Portions Copyright (c) 1995-2003 by Internet Software Consortium
38 * Permission to use, copy, modify, and distribute this software for any
39 * purpose with or without fee is hereby granted, provided that the above
40 * copyright notice and this permission notice appear in all copies.
42 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
43 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
44 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
45 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
46 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
47 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
48 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
50 * Internet Systems Consortium, Inc.
52 * Redwood City, CA 94063
58 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
66 * This used to be defined in res_query.c, now it's in herror.c.
67 * [XXX no it's not. It's in irs/irs_data.c]
69 * never extern'd by any *.h file before it was placed here. For thread
70 * aware programs, the last h_errno value set is stored in res->h_errno.
72 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
73 * (and __h_errno_set) to the public via <resolv.h>.
74 * XXX: __h_errno_set is really part of IRS, not part of the resolver.
75 * If somebody wants to build and use a resolver that doesn't use IRS,
76 * what do they do? Perhaps something like
78 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
80 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
84 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
85 struct __res_state
; /* forward */
86 void __h_errno_set(struct __res_state
*res
, int err
);
89 * Resolver configuration file.
90 * Normally not present, but may contain the address of the
91 * inital name server(s) to query and the domain search list.
95 #define _PATH_RESCONF "/etc/resolv.conf"
98 typedef enum { res_goahead
, res_nextns
, res_modified
, res_done
, res_error
}
101 typedef res_sendhookact (*res_send_qhook
) (struct sockaddr_in
* const *ns
,
108 typedef res_sendhookact (*res_send_rhook
) (const struct sockaddr_in
*ns
,
116 int number
; /* Identifying number, like T_MX */
117 char * name
; /* Its symbolic name, like "MX" */
118 char * humanname
; /* Its fun name, like "mail exchanger" */
122 * Global defines and variables for resolver stub.
124 #define MAXNS 3 /* max # name servers we'll track */
125 #define MAXDFLSRCH 3 /* # default domain levels to try */
126 #define MAXDNSRCH 6 /* max # domains in search path */
127 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
129 #define RES_TIMEOUT 5 /* min. seconds between retries */
130 #define MAXRESOLVSORT 10 /* number of net to sort on */
131 #define RES_MAXNDOTS 15 /* should reflect bit field size */
132 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
133 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
134 #define RES_DFLRETRY 2 /* Default #/tries. */
137 int retrans
; /* retransmition time interval */
138 int retry
; /* number of times to retransmit */
139 u_long options
; /* option flags - see below. */
140 int nscount
; /* number of name servers */
142 nsaddr_list
[MAXNS
]; /* address of name server */
143 #define nsaddr nsaddr_list[0] /* for backward compatibility */
144 u_short id
; /* current message id */
145 char *dnsrch
[MAXDNSRCH
+1]; /* components of domain to search */
146 char defdname
[256]; /* default domain (deprecated) */
147 u_long pfcode
; /* RES_PRF_ flags - see below. */
148 unsigned ndots
:4; /* threshold for initial abs. query */
149 unsigned nsort
:4; /* number of elements in sort_list[] */
154 } sort_list
[MAXRESOLVSORT
];
155 res_send_qhook qhook
; /* query hook */
156 res_send_rhook rhook
; /* response hook */
157 int res_h_errno
; /* last one set for this context */
158 int _sock
; /* PRIVATE: for res_send i/o */
159 u_int _flags
; /* PRIVATE: see below */
160 char pad
[52]; /* On an i386 this means 512b total. */
163 typedef struct __res_state
*res_state
;
166 * Resolver flags (used to be discrete per-module statics ints).
168 #define RES_F_VC 0x00000001 /* socket is TCP */
169 #define RES_F_CONN 0x00000002 /* socket is connected */
171 /* res_findzonecut() options */
172 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
175 * Resolver options (keep these in synch with res_debug.c, please)
177 #define RES_INIT 0x00000001 /* address initialized */
178 #define RES_DEBUG 0x00000002 /* print debug messages */
179 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
180 #define RES_USEVC 0x00000008 /* use virtual circuit */
181 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
182 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
183 #define RES_RECURSE 0x00000040 /* recursion desired */
184 #define RES_DEFNAMES 0x00000080 /* use default domain name */
185 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
186 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
187 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
188 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
189 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
190 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
191 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
192 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
193 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
195 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
198 * Resolver "pfcode" values. Used by dig.
200 #define RES_PRF_STATS 0x00000001
201 #define RES_PRF_UPDATE 0x00000002
202 #define RES_PRF_CLASS 0x00000004
203 #define RES_PRF_CMD 0x00000008
204 #define RES_PRF_QUES 0x00000010
205 #define RES_PRF_ANS 0x00000020
206 #define RES_PRF_AUTH 0x00000040
207 #define RES_PRF_ADD 0x00000080
208 #define RES_PRF_HEAD1 0x00000100
209 #define RES_PRF_HEAD2 0x00000200
210 #define RES_PRF_TTLID 0x00000400
211 #define RES_PRF_HEADX 0x00000800
212 #define RES_PRF_QUERY 0x00001000
213 #define RES_PRF_REPLY 0x00002000
214 #define RES_PRF_INIT 0x00004000
218 /* Things involving an internal (static) resolver context. */
220 extern struct __res_state
*__res_state(void);
221 #define _res (*__res_state())
223 #ifndef __BIND_NOSTATIC
224 extern struct __res_state _res
;
228 void fp_nquery (const u_char
*, int, FILE *);
229 void fp_query (const u_char
*, FILE *);
230 const char * hostalias (const char *);
231 void p_query (const u_char
*);
232 void res_close (void);
234 int res_isourserver (const struct sockaddr_in
*);
235 int res_mkquery (int, const char *, int, int, const u_char
*,
236 int, const u_char
*, u_char
*, int);
237 int res_query (const char *, int, int, u_char
*, int);
238 int res_querydomain (const char *, const char *, int, int,
240 int res_search (const char *, int, int, u_char
*, int);
241 int res_send (const u_char
*, int, u_char
*, int);
242 int res_sendsigned (const u_char
*, int, ns_tsig_key
*,
245 #if !defined(SHARED_LIBBIND) || defined(LIB)
247 * If libbind is a shared object (well, DLL anyway)
248 * these externs break the linker when resolv.h is
249 * included by a lib client (like named)
250 * Make them go away if a client is including this
253 extern const struct res_sym __p_key_syms
[];
254 extern const struct res_sym __p_cert_syms
[];
255 extern const struct res_sym __p_class_syms
[];
256 extern const struct res_sym __p_type_syms
[];
257 extern const struct res_sym __p_rcode_syms
[];
258 #endif /* SHARED_LIBBIND */
260 int res_hnok (const char *);
261 int res_ownok (const char *);
262 int res_mailok (const char *);
263 int res_dnok (const char *);
264 int sym_ston (const struct res_sym
*, const char *, int *);
265 const char * sym_ntos (const struct res_sym
*, int, int *);
266 const char * sym_ntop (const struct res_sym
*, int, int *);
267 int b64_ntop (u_char
const *, size_t, char *, size_t);
268 int b64_pton (char const *, u_char
*, size_t);
269 int loc_aton (const char *ascii
, u_char
*binary
);
270 const char * loc_ntoa (const u_char
*binary
, char *ascii
);
271 int dn_skipname (const u_char
*, const u_char
*);
272 void putlong (u_int32_t
, u_char
*);
273 void putshort (u_int16_t
, u_char
*);
274 const char * p_class (int);
275 const char * p_time (u_int32_t
);
276 const char * p_type (int);
277 const char * p_rcode (int);
278 const u_char
* p_cdnname (const u_char
*, const u_char
*, int, FILE *);
279 const u_char
* p_cdname (const u_char
*, const u_char
*, FILE *);
280 const u_char
* p_fqnname (const u_char
*cp
, const u_char
*msg
,
282 const u_char
* p_fqname (const u_char
*, const u_char
*, FILE *);
283 const char * p_option (u_long option
);
284 char * p_secstodate (u_long
);
285 int dn_count_labels (const char *);
286 int dn_expand (const u_char
*, const u_char
*, const u_char
*,
288 u_int
res_randomid (void);
289 int res_nameinquery (const char *, int, int,
290 const u_char
*, const u_char
*);
291 int res_queriesmatch (const u_char
*, const u_char
*,
292 const u_char
*, const u_char
*);
293 const char * p_section (int section
, int opcode
);
294 /* Things involving a resolver context. */
295 int res_ninit (res_state
);
296 int res_nisourserver (const res_state
,
297 const struct sockaddr_in
*);
298 void fp_resstat (const res_state
, FILE *);
299 void res_npquery (const res_state
, const u_char
*, int, FILE *);
300 const char * res_hostalias (const res_state
, const char *,
302 int res_nquery (res_state
,
303 const char *, int, int, u_char
*, int);
304 int res_nsearch (res_state
, const char *, int,
306 int res_nquerydomain (res_state
,
307 const char *, const char *, int, int,
309 int res_nmkquery (res_state
,
310 int, const char *, int, int, const u_char
*,
311 int, const u_char
*, u_char
*, int);
312 int res_nsend (res_state
, const u_char
*, int, u_char
*, int);
313 int res_nsendsigned (res_state
, const u_char
*, int,
314 ns_tsig_key
*, u_char
*, int);
315 int res_findzonecut (res_state
, const char *, ns_class
, int,
316 char *, size_t, struct in_addr
*, int);
317 void res_nclose (res_state
);
320 #endif /* !_RESOLV_H_ */