2 * Copyright (c) 1983, 1987, 1989
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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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.
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19 * without specific prior written permission.
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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52 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
53 * $Id: resolv.h,v 8.29 1999/10/07 08:24:14 vixie Exp $
59 #include <sys/param.h>
60 #if (!defined(BSD)) || (BSD < 199306)
61 # include <sys/bitypes.h>
63 # include <sys/types.h>
65 #include <sys/cdefs.h>
69 * Revision information. This is the release date in YYYYMMDD format.
70 * It can change every day so the right thing to do with it is use it
71 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
72 * compare for equality; rather, use it to determine whether your resolver
73 * is new enough to contain a certain feature.
76 #define __RES 19991006
79 * This used to be defined in res_query.c, now it's in herror.c.
80 * [XXX no it's not. It's in irs/irs_data.c]
82 * never extern'd by any *.h file before it was placed here. For thread
83 * aware programs, the last h_errno value set is stored in res->h_errno.
85 * XXX: There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
86 * (and __h_errno_set) to the public via <resolv.h>.
87 * XXX: __h_errno_set is really part of IRS, not part of the resolver.
88 * If somebody wants to build and use a resolver that doesn't use IRS,
89 * what do they do? Perhaps something like
91 * # define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
93 * # define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
97 #define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
98 struct __res_state; /* forward */
99 void __h_errno_set(struct __res_state *res, int err);
102 * Resolver configuration file.
103 * Normally not present, but may contain the address of the
104 * inital name server(s) to query and the domain search list.
107 #ifndef _PATH_RESCONF
108 #define _PATH_RESCONF "/etc/resolv.conf"
111 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
114 typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr_in * const *ns,
115 const u_char **query,
121 typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr_in *ns,
129 int number; /* Identifying number, like T_MX */
130 char * name; /* Its symbolic name, like "MX" */
131 char * humanname; /* Its fun name, like "mail exchanger" */
135 * Global defines and variables for resolver stub.
137 #define MAXNS 3 /* max # name servers we'll track */
138 #define MAXDFLSRCH 3 /* # default domain levels to try */
139 #define MAXDNSRCH 6 /* max # domains in search path */
140 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
142 #define RES_TIMEOUT 5 /* min. seconds between retries */
143 #define MAXRESOLVSORT 10 /* number of net to sort on */
144 #define RES_MAXNDOTS 15 /* should reflect bit field size */
145 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
146 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
147 #define RES_DFLRETRY 2 /* Default #/tries. */
150 int retrans; /* retransmition time interval */
151 int retry; /* number of times to retransmit */
152 u_long options; /* option flags - see below. */
153 int nscount; /* number of name servers */
155 nsaddr_list[MAXNS]; /* address of name server */
156 #define nsaddr nsaddr_list[0] /* for backward compatibility */
157 u_short id; /* current message id */
158 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
159 char defdname[256]; /* default domain (deprecated) */
160 u_long pfcode; /* RES_PRF_ flags - see below. */
161 unsigned ndots:4; /* threshold for initial abs. query */
162 unsigned nsort:4; /* number of elements in sort_list[] */
167 } sort_list[MAXRESOLVSORT];
168 res_send_qhook qhook; /* query hook */
169 res_send_rhook rhook; /* response hook */
170 int res_h_errno; /* last one set for this context */
171 int _sock; /* PRIVATE: for res_send i/o */
172 u_int _flags; /* PRIVATE: see below */
173 char pad[52]; /* On an i386 this means 512b total. */
176 typedef struct __res_state *res_state;
179 * Resolver flags (used to be discrete per-module statics ints).
181 #define RES_F_VC 0x00000001 /* socket is TCP */
182 #define RES_F_CONN 0x00000002 /* socket is connected */
184 /* res_findzonecut() options */
185 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
188 * Resolver options (keep these in synch with res_debug.c, please)
190 #define RES_INIT 0x00000001 /* address initialized */
191 #define RES_DEBUG 0x00000002 /* print debug messages */
192 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
193 #define RES_USEVC 0x00000008 /* use virtual circuit */
194 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
195 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
196 #define RES_RECURSE 0x00000040 /* recursion desired */
197 #define RES_DEFNAMES 0x00000080 /* use default domain name */
198 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
199 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
200 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
201 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
202 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
203 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
204 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
205 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
206 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
208 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
211 * Resolver "pfcode" values. Used by dig.
213 #define RES_PRF_STATS 0x00000001
214 #define RES_PRF_UPDATE 0x00000002
215 #define RES_PRF_CLASS 0x00000004
216 #define RES_PRF_CMD 0x00000008
217 #define RES_PRF_QUES 0x00000010
218 #define RES_PRF_ANS 0x00000020
219 #define RES_PRF_AUTH 0x00000040
220 #define RES_PRF_ADD 0x00000080
221 #define RES_PRF_HEAD1 0x00000100
222 #define RES_PRF_HEAD2 0x00000200
223 #define RES_PRF_TTLID 0x00000400
224 #define RES_PRF_HEADX 0x00000800
225 #define RES_PRF_QUERY 0x00001000
226 #define RES_PRF_REPLY 0x00002000
227 #define RES_PRF_INIT 0x00004000
230 /* Things involving an internal (static) resolver context. */
232 extern struct __res_state *__res_state(void);
233 #define _res (*__res_state())
235 #ifndef __BIND_NOSTATIC
236 extern struct __res_state _res;
240 #ifndef __BIND_NOSTATIC
241 #define fp_nquery __fp_nquery
242 #define fp_query __fp_query
243 #define hostalias __hostalias
244 #define p_query __p_query
245 #define res_close __res_close
246 #define res_init __res_init
247 #define res_isourserver __res_isourserver
248 #define res_mkquery __res_mkquery
249 #define res_query __res_query
250 #define res_querydomain __res_querydomain
251 #define res_search __res_search
252 #define res_send __res_send
253 #define res_sendsigned __res_sendsigned
256 void fp_nquery __P((const u_char *, int, FILE *));
257 void fp_query __P((const u_char *, FILE *));
258 const char * hostalias __P((const char *));
259 void p_query __P((const u_char *));
260 void res_close __P((void));
261 int res_init __P((void));
262 int res_isourserver __P((const struct sockaddr_in *));
263 int res_mkquery __P((int, const char *, int, int, const u_char *,
264 int, const u_char *, u_char *, int));
265 int res_query __P((const char *, int, int, u_char *, int));
266 int res_querydomain __P((const char *, const char *, int, int,
268 int res_search __P((const char *, int, int, u_char *, int));
269 int res_send __P((const u_char *, int, u_char *, int));
270 int res_sendsigned __P((const u_char *, int, ns_tsig_key *,
275 #if !defined(SHARED_LIBBIND) || defined(LIB)
277 * If libbind is a shared object (well, DLL anyway)
278 * these externs break the linker when resolv.h is
279 * included by a lib client (like named)
280 * Make them go away if a client is including this
283 extern const struct res_sym __p_key_syms[];
284 extern const struct res_sym __p_cert_syms[];
285 extern const struct res_sym __p_class_syms[];
286 extern const struct res_sym __p_type_syms[];
287 extern const struct res_sym __p_rcode_syms[];
288 #endif /* SHARED_LIBBIND */
290 #define b64_ntop __b64_ntop
291 #define b64_pton __b64_pton
292 #define dn_comp __dn_comp
293 #define dn_count_labels __dn_count_labels
294 #define dn_expand __dn_expand
295 #define dn_skipname __dn_skipname
296 #define fp_resstat __fp_resstat
297 #define loc_aton __loc_aton
298 #define loc_ntoa __loc_ntoa
299 #define p_cdname __p_cdname
300 #define p_cdnname __p_cdnname
301 #define p_class __p_class
302 #define p_fqname __p_fqname
303 #define p_fqnname __p_fqnname
304 #define p_option __p_option
305 #define p_secstodate __p_secstodate
306 #define p_section __p_section
307 #define p_time __p_time
308 #define p_type __p_type
309 #define p_rcode __p_rcode
310 #define putlong __putlong
311 #define putshort __putshort
312 #define res_dnok __res_dnok
313 #define res_findzonecut __res_findzonecut
314 #define res_hnok __res_hnok
315 #define res_hostalias __res_hostalias
316 #define res_mailok __res_mailok
317 #define res_nameinquery __res_nameinquery
318 #define res_nclose __res_nclose
319 #define res_ninit __res_ninit
320 #define res_nmkquery __res_nmkquery
321 #define res_npquery __res_npquery
322 #define res_nquery __res_nquery
323 #define res_nquerydomain __res_nquerydomain
324 #define res_nsearch __res_nsearch
325 #define res_nsend __res_nsend
326 #define res_nsendsigned __res_nsendsigned
327 #define res_nisourserver __res_nisourserver
328 #define res_ownok __res_ownok
329 #define res_queriesmatch __res_queriesmatch
330 #define res_randomid __res_randomid
331 #define sym_ntop __sym_ntop
332 #define sym_ntos __sym_ntos
333 #define sym_ston __sym_ston
335 int res_hnok __P((const char *));
336 int res_ownok __P((const char *));
337 int res_mailok __P((const char *));
338 int res_dnok __P((const char *));
339 int sym_ston __P((const struct res_sym *, const char *, int *));
340 const char * sym_ntos __P((const struct res_sym *, int, int *));
341 const char * sym_ntop __P((const struct res_sym *, int, int *));
342 int b64_ntop __P((u_char const *, size_t, char *, size_t));
343 int b64_pton __P((char const *, u_char *, size_t));
344 int loc_aton __P((const char *ascii, u_char *binary));
345 const char * loc_ntoa __P((const u_char *binary, char *ascii));
346 int dn_skipname __P((const u_char *, const u_char *));
347 void putlong __P((u_int32_t, u_char *));
348 void putshort __P((u_int16_t, u_char *));
349 const char * p_class __P((int));
350 const char * p_time __P((u_int32_t));
351 const char * p_type __P((int));
352 const char * p_rcode __P((int));
353 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
354 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
355 const u_char * p_fqnname __P((const u_char *cp, const u_char *msg,
357 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
358 const char * p_option __P((u_long option));
359 char * p_secstodate __P((u_long));
360 int dn_count_labels __P((const char *));
361 int dn_comp __P((const char *, u_char *, int,
362 u_char **, u_char **));
363 int dn_expand __P((const u_char *, const u_char *, const u_char *,
365 u_int res_randomid __P((void));
366 int res_nameinquery __P((const char *, int, int,
367 const u_char *, const u_char *));
368 int res_queriesmatch __P((const u_char *, const u_char *,
369 const u_char *, const u_char *));
370 const char * p_section __P((int section, int opcode));
371 /* Things involving a resolver context. */
372 int res_ninit __P((res_state));
373 int res_nisourserver __P((const res_state,
374 const struct sockaddr_in *));
375 void fp_resstat __P((const res_state, FILE *));
376 void res_npquery __P((const res_state, const u_char *, int, FILE *));
377 const char * res_hostalias __P((const res_state, const char *,
379 int res_nquery __P((res_state,
380 const char *, int, int, u_char *, int));
381 int res_nsearch __P((res_state, const char *, int,
382 int, u_char *, int));
383 int res_nquerydomain __P((res_state,
384 const char *, const char *, int, int,
386 int res_nmkquery __P((res_state,
387 int, const char *, int, int, const u_char *,
388 int, const u_char *, u_char *, int));
389 int res_nsend __P((res_state, const u_char *, int, u_char *, int));
390 int res_nsendsigned __P((res_state, const u_char *, int,
391 ns_tsig_key *, u_char *, int));
392 int res_findzonecut __P((res_state, const char *, ns_class, int,
393 char *, size_t, struct in_addr *, int));
394 void res_nclose __P((res_state));
397 #endif /* !_RESOLV_H_ */