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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,
81 typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
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 3 /* Default #/tries. */
102 /* (glibc uses RES_DFLRETRY of 2 but also does _res.retry = 4 sometimes (!) */
103 # define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
105 /* _res (an instance of this structure) uses 0.5kb in bss
106 * in "ordinary" libc's (glibc, xBSD). We want to be less wasteful.
107 * We (1) shuffle and shrink some integer fields,
108 * and (2) can switch off stuff we don't support.
109 * Everything inside __UCLIBC_HAS_COMPAT_RES_STATE__
110 * is not actually used by uclibc and can be configured off.
111 * However, this will prevent some programs from building.
112 * Really obscure stuff with no observed users in the wild is under
113 * __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__.
114 * I guess it's safe to set that to N.
117 #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
118 int retrans; /* retransmission time interval */
119 int retry; /* number of times to retransmit */
121 u_int32_t options; /* (was: ulong) option flags - see below. */
122 struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */
123 #define nsaddr nsaddr_list[0] /* for backward compatibility */
124 char *dnsrch[MAXDNSRCH + 1]; /* components of domain to search */
125 #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
126 /* googling for "_res.defdname" says it's still sometimes used.
127 * Pity. It's huge, I want to move it to EXTRA_COMPAT... */
128 char defdname[256]; /* default domain (deprecated) */
130 u_int8_t nscount; /* (was: int) number of name servers */
131 u_int8_t ndots; /* (was: unsigned:4) threshold for initial abs. query */
132 #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
133 u_int8_t nsort; /* (was: unsigned:4) number of elements in sort_list[] */
134 u_int16_t pfcode; /* (was: ulong) RES_PRF_ flags. Used by dig. */
135 unsigned short id; /* current message id */
136 int res_h_errno; /* last one set for this context */
140 } sort_list[MAXRESOLVSORT];
143 #ifdef __UCLIBC_HAS_IPV6__
144 /* I assume that the intention is to store all
145 * DNS servers' addresses here, and duplicate in nsaddr_list[]
146 * those which have IPv4 address. In the case of IPv4 address
147 * _u._ext.nsaddrs[x] will point to some nsaddr_list[y],
148 * otherwise it will point into malloc'ed sockaddr_in6.
149 * nscount is the number of IPv4 addresses and _u._ext.nscount
150 * is the number of addresses of all kinds.
152 * If this differs from established usage and you need
153 * to change this, please describe how it is supposed to work.
157 struct sockaddr_in6 *nsaddrs[MAXNS];
158 u_int8_t nscount; /* (was: u_int16_t) */
159 #ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
160 /* rather obscure, and differs in BSD and glibc */
161 u_int16_t nstimes[MAXNS];
165 /* glibc also has: */
166 /*u_int16_t nsmap[MAXNS];*/
167 /*unsigned long long initstamp;*/
173 #ifdef __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__
174 /* Truly obscure stuff.
175 * Googling for "_res.XXX" for these members
176 * turned up basically empty */
177 res_send_qhook qhook; /* query hook */
178 res_send_rhook rhook; /* response hook */
179 int _vcsock; /* PRIVATE: for res_send VC i/o */
180 unsigned _flags; /* PRIVATE: see below */
184 typedef struct __res_state *res_state;
185 # undef __need_res_state
190 * Revision information. This is the release date in YYYYMMDD format.
191 * It can change every day so the right thing to do with it is use it
192 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
193 * compare for equality; rather, use it to determine whether your resolver
194 * is new enough to contain a certain feature.
198 #define __RES 19991006
200 #define __RES 19960801
204 * Resolver configuration file.
205 * Normally not present, but may contain the address of the
206 * inital name server(s) to query and the domain search list.
209 #ifndef _PATH_RESCONF
210 #define _PATH_RESCONF "/etc/resolv.conf"
214 int number; /* Identifying number, like T_MX */
215 char * name; /* Its symbolic name, like "MX" */
216 char * humanname; /* Its fun name, like "mail exchanger" */
220 * Resolver flags (used to be discrete per-module statics ints).
222 #define RES_F_VC 0x00000001 /* socket is TCP */
223 #define RES_F_CONN 0x00000002 /* socket is connected */
225 /* res_findzonecut() options */
226 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
229 * Resolver options (keep these in synch with res_debug.c, please)
230 * (which of these do we really implement??)
232 #define RES_INIT 0x00000001 /* address initialized */
233 #define RES_DEBUG 0x00000002 /* print debug messages */
234 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
235 #define RES_USEVC 0x00000008 /* use virtual circuit */
236 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
237 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
238 #define RES_RECURSE 0x00000040 /* recursion desired */
239 #define RES_DEFNAMES 0x00000080 /* use default domain name */
240 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
241 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
242 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
243 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
244 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
245 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
246 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
247 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
248 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
249 #define RES_BLAST 0x00020000 /* blast all recursive servers */
251 #define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte
253 #define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
256 #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
258 #define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH)
262 * Resolver "pfcode" values. Used by dig.
264 #define RES_PRF_STATS 0x00000001
265 #define RES_PRF_UPDATE 0x00000002
266 #define RES_PRF_CLASS 0x00000004
267 #define RES_PRF_CMD 0x00000008
268 #define RES_PRF_QUES 0x00000010
269 #define RES_PRF_ANS 0x00000020
270 #define RES_PRF_AUTH 0x00000040
271 #define RES_PRF_ADD 0x00000080
272 #define RES_PRF_HEAD1 0x00000100
273 #define RES_PRF_HEAD2 0x00000200
274 #define RES_PRF_TTLID 0x00000400
275 #define RES_PRF_HEADX 0x00000800
276 #define RES_PRF_QUERY 0x00001000
277 #define RES_PRF_REPLY 0x00002000
278 #define RES_PRF_INIT 0x00004000
281 /* Things involving an internal (static) resolver context. */
284 extern struct __res_state *__res_state(void) __attribute__ ((__const__));
286 #define _res (*__res_state())
288 extern struct __res_state _res;
291 #define fp_nquery __fp_nquery
292 #define fp_query __fp_query
293 #define hostalias __hostalias
294 #define p_query __p_query
295 #define res_close __res_close
296 #define res_init __res_init
297 #define res_isourserver __res_isourserver
298 #define res_mkquery __res_mkquery
299 #define res_query __res_query
300 #define res_querydomain __res_querydomain
301 #define res_search __res_search
302 #define res_send __res_send
305 void fp_nquery (const u_char *, int, FILE *) __THROW;
306 void fp_query (const u_char *, FILE *) __THROW;
307 const char * hostalias (const char *) __THROW;
308 void p_query (const u_char *) __THROW;
309 #ifdef __UCLIBC_HAS_BSD_RES_CLOSE__
310 void res_close (void) __THROW;
312 int res_init (void) __THROW;
313 libc_hidden_proto(res_init)
314 int res_isourserver (const struct sockaddr_in *) __THROW;
315 int res_mkquery (int, const char *, int, int, const u_char *,
316 int, const u_char *, u_char *, int) __THROW;
317 int res_query (const char *, int, int, u_char *, int) __THROW;
318 libc_hidden_proto(res_query)
319 int res_querydomain (const char *, const char *, int, int,
320 u_char *, int) __THROW;
321 libc_hidden_proto(res_querydomain)
322 int res_search (const char *, int, int, u_char *, int) __THROW;
323 int res_send (const u_char *, int, u_char *, int) __THROW;
326 #define b64_ntop __b64_ntop
327 #define b64_pton __b64_pton
328 #define dn_comp __dn_comp
329 #define dn_count_labels __dn_count_labels
330 #define dn_expand __dn_expand
331 #define dn_skipname __dn_skipname
332 #define fp_resstat __fp_resstat
333 #define loc_aton __loc_aton
334 #define loc_ntoa __loc_ntoa
335 #define p_cdname __p_cdname
336 #define p_cdnname __p_cdnname
337 #define p_class __p_class
338 #define p_fqname __p_fqname
339 #define p_fqnname __p_fqnname
340 #define p_option __p_option
341 #define p_secstodate __p_secstodate
342 #define p_section __p_section
343 #define p_time __p_time
344 #define p_type __p_type
345 #define p_rcode __p_rcode
346 #define putlong __putlong
347 #define putshort __putshort
348 #define res_dnok __res_dnok
349 #define res_hnok __res_hnok
350 #define res_hostalias __res_hostalias
351 #define res_mailok __res_mailok
352 #define res_nameinquery __res_nameinquery
353 #define res_nclose __res_nclose
354 #define res_ninit __res_ninit
355 #define res_nmkquery __res_nmkquery
356 #define res_npquery __res_npquery
357 #define res_nquery __res_nquery
358 #define res_nquerydomain __res_nquerydomain
359 #define res_nsearch __res_nsearch
360 #define res_nsend __res_nsend
361 #define res_nisourserver __res_nisourserver
362 #define res_ownok __res_ownok
363 #define res_queriesmatch __res_queriesmatch
364 #define res_randomid __res_randomid
365 #define sym_ntop __sym_ntop
366 #define sym_ntos __sym_ntos
367 #define sym_ston __sym_ston
369 int res_hnok (const char *) __THROW;
370 int res_ownok (const char *) __THROW;
371 int res_mailok (const char *) __THROW;
372 int res_dnok (const char *) __THROW;
373 int sym_ston (const struct res_sym *, const char *, int *) __THROW;
374 const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
375 const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
376 int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
377 int b64_pton (char const *, u_char *, size_t) __THROW;
378 int loc_aton (const char *ascii, u_char *binary) __THROW;
379 const char * loc_ntoa (const u_char *binary, char *ascii) __THROW;
380 int dn_skipname (const u_char *, const u_char *) __THROW;
381 void putlong (u_int32_t, u_char *) __THROW;
382 void putshort (u_int16_t, u_char *) __THROW;
383 const char * p_class (int) __THROW;
384 const char * p_time (u_int32_t) __THROW;
385 const char * p_type (int) __THROW;
386 const char * p_rcode (int) __THROW;
387 const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
389 const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
390 const u_char * p_fqnname (const u_char *cp, const u_char *msg,
391 int, char *, int) __THROW;
392 const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
393 const char * p_option (u_long option) __THROW;
394 char * p_secstodate (u_long) __THROW;
395 int dn_count_labels (const char *) __THROW;
396 int dn_comp (const char *, u_char *, int, u_char **, u_char **)
398 int dn_expand (const u_char *, const u_char *, const u_char *,
399 char *, int) __THROW;
400 u_int res_randomid (void) __THROW;
401 int res_nameinquery (const char *, int, int,
402 const u_char *, const u_char *) __THROW;
403 int res_queriesmatch (const u_char *, const u_char *,
404 const u_char *, const u_char *) __THROW;
405 const char * p_section (int section, int opcode) __THROW;
406 /* Things involving a resolver context. */
407 int res_ninit (res_state) __THROW;
408 int res_nisourserver (const res_state,
409 const struct sockaddr_in *) __THROW;
410 void fp_resstat (const res_state, FILE *) __THROW;
411 void res_npquery (const res_state, const u_char *, int, FILE *)
413 const char * res_hostalias (const res_state, const char *, char *, size_t)
415 int res_nquery (res_state, const char *, int, int, u_char *, int)
417 int res_nsearch (res_state, const char *, int, int, u_char *, int)
419 int res_nquerydomain (res_state, const char *, const char *, int,
420 int, u_char *, int) __THROW;
421 int res_nmkquery (res_state, int, const char *, int, int,
422 const u_char *, int, const u_char *, u_char *,
424 int res_nsend (res_state, const u_char *, int, u_char *, int)
426 void res_nclose (res_state) __THROW;
430 #endif /* !_RESOLV_H_ */