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48 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
49 * $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
54 /* These headers are needed for types used in the `struct res_state'
56 #include <sys/types.h>
57 #include <netinet/in.h>
59 #ifndef __need_res_state
62 # include <sys/param.h>
63 # include <sys/cdefs.h>
65 # include <arpa/nameser.h>
68 #ifndef __res_state_defined
69 # define __res_state_defined
71 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
74 typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *__ns,
75 const u_char **__query,
81 typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *__ns,
82 const u_char *__query,
89 * Global defines and variables for resolver stub.
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" */
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. */
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 */
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 */
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. */
133 char pad[52]; /* On an i386 this means 512b total. */
136 u_int16_t nsmap[MAXNS];
140 struct sockaddr_in6 *nsaddrs[MAXNS];
142 unsigned long long int initstamp
143 __attribute__((packed));
145 unsigned int _initstamp[2];
151 typedef struct __res_state *res_state;
152 # undef __need_res_state
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.
164 #define __RES 19991006
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.
172 #ifndef _PATH_RESCONF
173 #define _PATH_RESCONF "/etc/resolv.conf"
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" */
183 * Resolver flags (used to be discrete per-module statics ints).
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 */
189 /* res_findzonecut() options */
190 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
193 * Resolver options (keep these in synch with res_debug.c, please)
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. */
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
215 #define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
217 #define RES_USE_EDNS0 0x00100000 /* Use EDNS0. */
219 #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
222 * Resolver "pfcode" values. Used by dig.
224 #define RES_PRF_STATS 0x00000001
225 #define RES_PRF_UPDATE 0x00000002
226 #define RES_PRF_CLASS 0x00000004
227 #define RES_PRF_CMD 0x00000008
228 #define RES_PRF_QUES 0x00000010
229 #define RES_PRF_ANS 0x00000020
230 #define RES_PRF_AUTH 0x00000040
231 #define RES_PRF_ADD 0x00000080
232 #define RES_PRF_HEAD1 0x00000100
233 #define RES_PRF_HEAD2 0x00000200
234 #define RES_PRF_TTLID 0x00000400
235 #define RES_PRF_HEADX 0x00000800
236 #define RES_PRF_QUERY 0x00001000
237 #define RES_PRF_REPLY 0x00002000
238 #define RES_PRF_INIT 0x00004000
241 /* Things involving an internal (static) resolver context. */
243 extern struct __res_state *__res_state(void) __attribute__ ((__const__));
245 #define _res (*__res_state())
247 #ifndef __BIND_NOSTATIC
248 #define fp_nquery __fp_nquery
249 #define fp_query __fp_query
250 #define hostalias __hostalias
251 #define p_query __p_query
252 #define res_close __res_close
253 #define res_init __res_init
254 #define res_isourserver __res_isourserver
255 #define res_mkquery __res_mkquery
256 #define res_query __res_query
257 #define res_querydomain __res_querydomain
258 #define res_search __res_search
259 #define res_send __res_send
262 void fp_nquery (const u_char *, int, FILE *) __THROW;
263 void fp_query (const u_char *, FILE *) __THROW;
264 const char * hostalias (const char *) __THROW;
265 void p_query (const u_char *) __THROW;
266 void res_close (void) __THROW;
267 int res_init (void) __THROW;
268 int res_isourserver (const struct sockaddr_in *) __THROW;
269 int res_mkquery (int, const char *, int, int, const u_char *,
270 int, const u_char *, u_char *, int) __THROW;
271 int res_query (const char *, int, int, u_char *, int) __THROW;
272 int res_querydomain (const char *, const char *, int, int,
273 u_char *, int) __THROW;
274 int res_search (const char *, int, int, u_char *, int) __THROW;
275 int res_send (const u_char *, int, u_char *, int) __THROW;
279 #define b64_ntop __b64_ntop
280 #define b64_pton __b64_pton
281 #define dn_comp __dn_comp
282 #define dn_count_labels __dn_count_labels
283 #define dn_expand __dn_expand
284 #define dn_skipname __dn_skipname
285 #define fp_resstat __fp_resstat
286 #define loc_aton __loc_aton
287 #define loc_ntoa __loc_ntoa
288 #define p_cdname __p_cdname
289 #define p_cdnname __p_cdnname
290 #define p_class __p_class
291 #define p_fqname __p_fqname
292 #define p_fqnname __p_fqnname
293 #define p_option __p_option
294 #define p_secstodate __p_secstodate
295 #define p_section __p_section
296 #define p_time __p_time
297 #define p_type __p_type
298 #define p_rcode __p_rcode
299 #define putlong __putlong
300 #define putshort __putshort
301 #define res_dnok __res_dnok
302 #define res_hnok __res_hnok
303 #define res_hostalias __res_hostalias
304 #define res_mailok __res_mailok
305 #define res_nameinquery __res_nameinquery
306 #define res_nclose __res_nclose
307 #define res_ninit __res_ninit
308 #define res_nmkquery __res_nmkquery
309 #define res_npquery __res_npquery
310 #define res_nquery __res_nquery
311 #define res_nquerydomain __res_nquerydomain
312 #define res_nsearch __res_nsearch
313 #define res_nsend __res_nsend
314 #define res_nisourserver __res_nisourserver
315 #define res_ownok __res_ownok
316 #define res_queriesmatch __res_queriesmatch
317 #define res_randomid __res_randomid
318 #define sym_ntop __sym_ntop
319 #define sym_ntos __sym_ntos
320 #define sym_ston __sym_ston
322 int res_hnok (const char *) __THROW;
323 int res_ownok (const char *) __THROW;
324 int res_mailok (const char *) __THROW;
325 int res_dnok (const char *) __THROW;
326 int sym_ston (const struct res_sym *, const char *, int *) __THROW;
327 const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
328 const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
329 int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
330 int b64_pton (char const *, u_char *, size_t) __THROW;
331 int loc_aton (const char *__ascii, u_char *__binary) __THROW;
332 const char * loc_ntoa (const u_char *__binary, char *__ascii) __THROW;
333 int dn_skipname (const u_char *, const u_char *) __THROW;
334 void putlong (u_int32_t, u_char *) __THROW;
335 void putshort (u_int16_t, u_char *) __THROW;
336 const char * p_class (int) __THROW;
337 const char * p_time (u_int32_t) __THROW;
338 const char * p_type (int) __THROW;
339 const char * p_rcode (int) __THROW;
340 const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
342 const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
343 const u_char * p_fqnname (const u_char *__cp, const u_char *__msg,
344 int, char *, int) __THROW;
345 const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
346 const char * p_option (u_long __option) __THROW;
347 char * p_secstodate (u_long) __THROW;
348 int dn_count_labels (const char *) __THROW;
349 int dn_comp (const char *, u_char *, int, u_char **, u_char **)
351 int dn_expand (const u_char *, const u_char *, const u_char *,
352 char *, int) __THROW;
353 u_int res_randomid (void) __THROW;
354 int res_nameinquery (const char *, int, int,
355 const u_char *, const u_char *) __THROW;
356 int res_queriesmatch (const u_char *, const u_char *,
357 const u_char *, const u_char *) __THROW;
358 const char * p_section (int __section, int __opcode) __THROW;
359 /* Things involving a resolver context. */
360 int res_ninit (res_state) __THROW;
361 int res_nisourserver (const res_state,
362 const struct sockaddr_in *) __THROW;
363 void fp_resstat (const res_state, FILE *) __THROW;
364 void res_npquery (const res_state, const u_char *, int, FILE *)
366 const char * res_hostalias (const res_state, const char *, char *, size_t)
368 int res_nquery (res_state, const char *, int, int, u_char *, int)
370 int res_nsearch (res_state, const char *, int, int, u_char *, int)
372 int res_nquerydomain (res_state, const char *, const char *, int,
373 int, u_char *, int) __THROW;
374 int res_nmkquery (res_state, int, const char *, int, int,
375 const u_char *, int, const u_char *, u_char *,
377 int res_nsend (res_state, const u_char *, int, u_char *, int)
379 void res_nclose (res_state) __THROW;
383 #endif /* !_RESOLV_H_ */