1/*
2 * Copyright (c) 1983, 1987, 1989
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
32 *
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies.
36 *
37 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
38 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
40 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
41 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
42 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
43 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
44 * SOFTWARE.
45 */
46
47/*
48 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
49 * $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
50 */
51
52#ifndef _RESOLV_H_
53
54/* These headers are needed for types used in the `struct res_state'
55 declaration. */
56#include <sys/types.h>
57#include <netinet/in.h>
58
59#ifndef __need_res_state
60# define _RESOLV_H_
61
62# include <sys/param.h>
63# include <sys/cdefs.h>
64# include <stdio.h>
65# include <arpa/nameser.h>
66#endif
67
68#ifndef __res_state_defined
69# define __res_state_defined
70
71typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
72 res_sendhookact;
73
74typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *__ns,
75 const u_char **__query,
76 int *__querylen,
77 u_char *__ans,
78 int __anssiz,
79 int *__resplen);
80
81typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *__ns,
82 const u_char *__query,
83 int __querylen,
84 u_char *__ans,
85 int __anssiz,
86 int *__resplen);
87
88/*
89 * Global defines and variables for resolver stub.
90 */
91# define MAXNS 3 /* max # name servers we'll track */
92# define MAXDFLSRCH 3 /* # default domain levels to try */
93# define MAXDNSRCH 6 /* max # domains in search path */
94# define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
95
96# define RES_TIMEOUT 5 /* min. seconds between retries */
97# define MAXRESOLVSORT 10 /* number of net to sort on */
98# define RES_MAXNDOTS 15 /* should reflect bit field size */
99# define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
100# define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
101# define RES_DFLRETRY 2 /* Default #/tries. */
102# define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
103
104struct __res_state {
105 int retrans; /* retransmition time interval */
106 int retry; /* number of times to retransmit */
107 u_long options; /* option flags - see below. */
108 int nscount; /* number of name servers */
109 struct sockaddr_in
110 nsaddr_list[MAXNS]; /* address of name server */
111# define nsaddr nsaddr_list[0] /* for backward compatibility */
112 u_short id; /* current message id */
113 /* 2 byte hole here. */
114 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
115 char defdname[256]; /* default domain (deprecated) */
116 u_long pfcode; /* RES_PRF_ flags - see below. */
117 unsigned ndots:4; /* threshold for initial abs. query */
118 unsigned nsort:4; /* number of elements in sort_list[] */
119 unsigned ipv6_unavail:1; /* connecting to IPv6 server failed */
120 unsigned unused:23;
121 struct {
122 struct in_addr addr;
123 u_int32_t mask;
124 } sort_list[MAXRESOLVSORT];
125 /* 4 byte hole here on 64-bit architectures. */
126 res_send_qhook qhook; /* query hook */
127 res_send_rhook rhook; /* response hook */
128 int res_h_errno; /* last one set for this context */
129 int _vcsock; /* PRIVATE: for res_send VC i/o */
130 u_int _flags; /* PRIVATE: see below */
131 /* 4 byte hole here on 64-bit architectures. */
132 union {
133 char pad[52]; /* On an i386 this means 512b total. */
134 struct {
135 u_int16_t nscount;
136 u_int16_t nsmap[MAXNS];
137 int nssocks[MAXNS];
138 u_int16_t nscount6;
139 u_int16_t nsinit;
140 struct sockaddr_in6 *nsaddrs[MAXNS];
141#ifdef _LIBC
142 unsigned long long int initstamp
143 __attribute__((packed));
144#else
145 unsigned int _initstamp[2];
146#endif
147 } _ext;
148 } _u;
149};
150
151typedef struct __res_state *res_state;
152# undef __need_res_state
153#endif
154
155#ifdef _RESOLV_H_
156/*
157 * Revision information. This is the release date in YYYYMMDD format.
158 * It can change every day so the right thing to do with it is use it
159 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
160 * compare for equality; rather, use it to determine whether your resolver
161 * is new enough to contain a certain feature.
162 */
163
164#define __RES 19991006
165
166/*
167 * Resolver configuration file.
168 * Normally not present, but may contain the address of the
169 * inital name server(s) to query and the domain search list.
170 */
171
172#ifndef _PATH_RESCONF
173#define _PATH_RESCONF "/etc/resolv.conf"
174#endif
175
176struct res_sym {
177 int number; /* Identifying number, like T_MX */
178 char * name; /* Its symbolic name, like "MX" */
179 char * humanname; /* Its fun name, like "mail exchanger" */
180};
181
182/*
183 * Resolver flags (used to be discrete per-module statics ints).
184 */
185#define RES_F_VC 0x00000001 /* socket is TCP */
186#define RES_F_CONN 0x00000002 /* socket is connected */
187#define RES_F_EDNS0ERR 0x00000004 /* EDNS0 caused errors */
188
189/* res_findzonecut() options */
190#define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
191
192/*
193 * Resolver options (keep these in synch with res_debug.c, please)
194 */
195#define RES_INIT 0x00000001 /* address initialized */
196#define RES_DEBUG 0x00000002 /* print debug messages */
197#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
198#define RES_USEVC 0x00000008 /* use virtual circuit */
199#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
200#define RES_IGNTC 0x00000020 /* ignore trucation errors */
201#define RES_RECURSE 0x00000040 /* recursion desired */
202#define RES_DEFNAMES 0x00000080 /* use default domain name */
203#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
204#define RES_DNSRCH 0x00000200 /* search up local domain tree */
205#define RES_INSECURE1 0x00000400 /* type 1 security disabled */
206#define RES_INSECURE2 0x00000800 /* type 2 security disabled */
207#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
208#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
209#define RES_ROTATE 0x00004000 /* rotate ns list after each query */
210#define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity (!IMPL) */
211#define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
212#define RES_BLAST 0x00020000 /* blast all recursive servers */
213#define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte
214 strings */
215#define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
216 reverse lookup */
217#define RES_USE_EDNS0 0x00100000 /* Use EDNS0. */
218#define RES_SNGLKUP 0x00200000 /* one outstanding request at a time */
219#define RES_SNGLKUPREOP 0x00400000 /* -"-, but open new socket for each
220 request */
221#define RES_USE_DNSSEC 0x00800000 /* use DNSSEC using OK bit in OPT */
222#define RES_NOTLDQUERY 0x01000000 /* Do not look up unqualified name
223 as a TLD. */
224
225#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
226
227/*
228 * Resolver "pfcode" values. Used by dig.
229 */
230#define RES_PRF_STATS 0x00000001
231#define RES_PRF_UPDATE 0x00000002
232#define RES_PRF_CLASS 0x00000004
233#define RES_PRF_CMD 0x00000008
234#define RES_PRF_QUES 0x00000010
235#define RES_PRF_ANS 0x00000020
236#define RES_PRF_AUTH 0x00000040
237#define RES_PRF_ADD 0x00000080
238#define RES_PRF_HEAD1 0x00000100
239#define RES_PRF_HEAD2 0x00000200
240#define RES_PRF_TTLID 0x00000400
241#define RES_PRF_HEADX 0x00000800
242#define RES_PRF_QUERY 0x00001000
243#define RES_PRF_REPLY 0x00002000
244#define RES_PRF_INIT 0x00004000
245/* 0x00008000 */
246
247/* Things involving an internal (static) resolver context. */
248__BEGIN_DECLS
249extern struct __res_state *__res_state(void) __attribute__ ((__const__));
250__END_DECLS
251#define _res (*__res_state())
252
253#ifndef __BIND_NOSTATIC
254#define fp_nquery __fp_nquery
255#define fp_query __fp_query
256#define hostalias __hostalias
257#define p_query __p_query
258#define res_close __res_close
259#define res_init __res_init
260#define res_isourserver __res_isourserver
261#define res_mkquery __res_mkquery
262#define res_query __res_query
263#define res_querydomain __res_querydomain
264#define res_search __res_search
265#define res_send __res_send
266
267__BEGIN_DECLS
268void fp_nquery (const u_char *, int, FILE *) __THROW;
269void fp_query (const u_char *, FILE *) __THROW;
270const char * hostalias (const char *) __THROW;
271void p_query (const u_char *) __THROW;
272void res_close (void) __THROW;
273int res_init (void) __THROW;
274int res_isourserver (const struct sockaddr_in *) __THROW;
275int res_mkquery (int, const char *, int, int, const u_char *,
276 int, const u_char *, u_char *, int) __THROW;
277int res_query (const char *, int, int, u_char *, int) __THROW;
278int res_querydomain (const char *, const char *, int, int,
279 u_char *, int) __THROW;
280int res_search (const char *, int, int, u_char *, int) __THROW;
281int res_send (const u_char *, int, u_char *, int) __THROW;
282__END_DECLS
283#endif
284
285#define b64_ntop __b64_ntop
286#define b64_pton __b64_pton
287#define dn_comp __dn_comp
288#define dn_count_labels __dn_count_labels
289#define dn_expand __dn_expand
290#define dn_skipname __dn_skipname
291#define fp_resstat __fp_resstat
292#define loc_aton __loc_aton
293#define loc_ntoa __loc_ntoa
294#define p_cdname __p_cdname
295#define p_cdnname __p_cdnname
296#define p_class __p_class
297#define p_fqname __p_fqname
298#define p_fqnname __p_fqnname
299#define p_option __p_option
300#define p_secstodate __p_secstodate
301#define p_section __p_section
302#define p_time __p_time
303#define p_type __p_type
304#define p_rcode __p_rcode
305#define putlong __putlong
306#define putshort __putshort
307#define res_dnok __res_dnok
308#define res_hnok __res_hnok
309#define res_hostalias __res_hostalias
310#define res_mailok __res_mailok
311#define res_nameinquery __res_nameinquery
312#define res_nclose __res_nclose
313#define res_ninit __res_ninit
314#define res_nmkquery __res_nmkquery
315#define res_npquery __res_npquery
316#define res_nquery __res_nquery
317#define res_nquerydomain __res_nquerydomain
318#define res_nsearch __res_nsearch
319#define res_nsend __res_nsend
320#define res_nisourserver __res_nisourserver
321#define res_ownok __res_ownok
322#define res_queriesmatch __res_queriesmatch
323#define res_randomid __res_randomid
324#define sym_ntop __sym_ntop
325#define sym_ntos __sym_ntos
326#define sym_ston __sym_ston
327__BEGIN_DECLS
328int res_hnok (const char *) __THROW;
329int res_ownok (const char *) __THROW;
330int res_mailok (const char *) __THROW;
331int res_dnok (const char *) __THROW;
332int sym_ston (const struct res_sym *, const char *, int *) __THROW;
333const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
334const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
335int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
336int b64_pton (char const *, u_char *, size_t) __THROW;
337int loc_aton (const char *__ascii, u_char *__binary) __THROW;
338const char * loc_ntoa (const u_char *__binary, char *__ascii) __THROW;
339int dn_skipname (const u_char *, const u_char *) __THROW;
340void putlong (u_int32_t, u_char *) __THROW;
341void putshort (u_int16_t, u_char *) __THROW;
342const char * p_class (int) __THROW;
343const char * p_time (u_int32_t) __THROW;
344const char * p_type (int) __THROW;
345const char * p_rcode (int) __THROW;
346const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
347 __THROW;
348const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
349const u_char * p_fqnname (const u_char *__cp, const u_char *__msg,
350 int, char *, int) __THROW;
351const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
352const char * p_option (u_long __option) __THROW;
353char * p_secstodate (u_long) __THROW;
354int dn_count_labels (const char *) __THROW;
355int dn_comp (const char *, u_char *, int, u_char **, u_char **)
356 __THROW;
357int dn_expand (const u_char *, const u_char *, const u_char *,
358 char *, int) __THROW;
359u_int res_randomid (void) __THROW;
360int res_nameinquery (const char *, int, int,
361 const u_char *, const u_char *) __THROW;
362int res_queriesmatch (const u_char *, const u_char *,
363 const u_char *, const u_char *) __THROW;
364const char * p_section (int __section, int __opcode) __THROW;
365/* Things involving a resolver context. */
366int res_ninit (res_state) __THROW;
367int res_nisourserver (const res_state,
368 const struct sockaddr_in *) __THROW;
369void fp_resstat (const res_state, FILE *) __THROW;
370void res_npquery (const res_state, const u_char *, int, FILE *)
371 __THROW;
372const char * res_hostalias (const res_state, const char *, char *, size_t)
373 __THROW;
374int res_nquery (res_state, const char *, int, int, u_char *, int)
375 __THROW;
376int res_nsearch (res_state, const char *, int, int, u_char *, int)
377 __THROW;
378int res_nquerydomain (res_state, const char *, const char *, int,
379 int, u_char *, int) __THROW;
380int res_nmkquery (res_state, int, const char *, int, int,
381 const u_char *, int, const u_char *, u_char *,
382 int) __THROW;
383int res_nsend (res_state, const u_char *, int, u_char *, int)
384 __THROW;
385void res_nclose (res_state) __THROW;
386__END_DECLS
387#endif
388
389#endif /* !_RESOLV_H_ */
390