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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 $
55 #include <sys/param.h>
56 #if (!defined(BSD)) || (BSD < 199306)
57 # include <sys/bitypes.h>
59 # include <sys/types.h>
61 #include <sys/cdefs.h>
64 #include <netinet/in.h>
65 #include <arpa/nameser.h>
68 * Revision information. This is the release date in YYYYMMDD format.
69 * It can change every day so the right thing to do with it is use it
70 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
71 * compare for equality; rather, use it to determine whether your resolver
72 * is new enough to contain a certain feature.
75 /* #define __RES 19991006 we don't have a new resolver yet */
76 #define __RES 19960801
79 * Resolver configuration file.
80 * Normally not present, but may contain the address of the
81 * inital name server(s) to query and the domain search list.
85 #define _PATH_RESCONF "/etc/resolv.conf"
88 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
91 typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
98 typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
106 int number; /* Identifying number, like T_MX */
107 char * name; /* Its symbolic name, like "MX" */
108 char * humanname; /* Its fun name, like "mail exchanger" */
112 * Global defines and variables for resolver stub.
114 #define MAXNS 3 /* max # name servers we'll track */
115 #define MAXDFLSRCH 3 /* # default domain levels to try */
116 #define MAXDNSRCH 6 /* max # domains in search path */
117 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
119 #define RES_TIMEOUT 5 /* min. seconds between retries */
120 #define MAXRESOLVSORT 10 /* number of net to sort on */
121 #define RES_MAXNDOTS 15 /* should reflect bit field size */
122 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
123 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
124 #define RES_DFLRETRY 2 /* Default #/tries. */
125 #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
128 int retrans; /* retransmition time interval */
129 int retry; /* number of times to retransmit */
130 u_long options; /* option flags - see below. */
131 int nscount; /* number of name servers */
133 nsaddr_list[MAXNS]; /* address of name server */
134 #define nsaddr nsaddr_list[0] /* for backward compatibility */
135 u_short id; /* current message id */
136 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
137 char defdname[256]; /* default domain (deprecated) */
138 u_long pfcode; /* RES_PRF_ flags - see below. */
139 unsigned ndots:4; /* threshold for initial abs. query */
140 unsigned nsort:4; /* number of elements in sort_list[] */
145 } sort_list[MAXRESOLVSORT];
146 res_send_qhook qhook; /* query hook */
147 res_send_rhook rhook; /* response hook */
148 int res_h_errno; /* last one set for this context */
149 int _vcsock; /* PRIVATE: for res_send VC i/o */
150 u_int _flags; /* PRIVATE: see below */
152 char pad[52]; /* On an i386 this means 512b total. */
155 u_int16_t nstimes[MAXNS]; /* ms. */
159 struct sockaddr_in6 *nsaddrs[MAXNS];
164 typedef struct __res_state *res_state;
167 * Resolver flags (used to be discrete per-module statics ints).
169 #define RES_F_VC 0x00000001 /* socket is TCP */
170 #define RES_F_CONN 0x00000002 /* socket is connected */
172 /* res_findzonecut() options */
173 #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
176 * Resolver options (keep these in synch with res_debug.c, please)
178 #define RES_INIT 0x00000001 /* address initialized */
179 #define RES_DEBUG 0x00000002 /* print debug messages */
180 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
181 #define RES_USEVC 0x00000008 /* use virtual circuit */
182 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
183 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
184 #define RES_RECURSE 0x00000040 /* recursion desired */
185 #define RES_DEFNAMES 0x00000080 /* use default domain name */
186 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
187 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
188 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
189 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
190 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
191 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
192 #define RES_ROTATE 0x00004000 /* rotate ns list after each query */
193 #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
194 #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
195 #define RES_BLAST 0x00020000 /* blast all recursive servers */
197 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
200 * Resolver "pfcode" values. Used by dig.
202 #define RES_PRF_STATS 0x00000001
203 #define RES_PRF_UPDATE 0x00000002
204 #define RES_PRF_CLASS 0x00000004
205 #define RES_PRF_CMD 0x00000008
206 #define RES_PRF_QUES 0x00000010
207 #define RES_PRF_ANS 0x00000020
208 #define RES_PRF_AUTH 0x00000040
209 #define RES_PRF_ADD 0x00000080
210 #define RES_PRF_HEAD1 0x00000100
211 #define RES_PRF_HEAD2 0x00000200
212 #define RES_PRF_TTLID 0x00000400
213 #define RES_PRF_HEADX 0x00000800
214 #define RES_PRF_QUERY 0x00001000
215 #define RES_PRF_REPLY 0x00002000
216 #define RES_PRF_INIT 0x00004000
220 /* Things involving an internal (static) resolver context. */
221 #if defined __UCLIBC_HAS_THREADS__
224 extern struct __res_state *__res_state(void) __attribute__ ((__const__));
226 #define _res (*__res_state())
228 #else /* !__UCLIBC_HAS_THREADS__ */
230 #ifndef __BIND_NOSTATIC
231 extern struct __res_state _res;
234 #endif /* __UCLIBC_HAS_THREADS__ */
237 #ifndef __BIND_NOSTATIC
238 #define fp_nquery __fp_nquery
239 #define fp_query __fp_query
240 #define hostalias __hostalias
241 #define p_query __p_query
242 #define res_close __res_close
243 #define res_init __res_init
244 #define res_isourserver __res_isourserver
245 #define res_mkquery __res_mkquery
246 #define res_query __res_query
247 #define res_querydomain __res_querydomain
248 #define res_search __res_search
249 #define res_send __res_send
252 void fp_nquery __P((const u_char *, int, FILE *));
253 void fp_query __P((const u_char *, FILE *));
254 const char * hostalias __P((const char *));
255 void p_query __P((const u_char *));
256 void res_close __P((void));
257 int res_init __P((void));
258 int res_isourserver __P((const struct sockaddr_in *));
259 int res_mkquery __P((int, const char *, int, int, const u_char *,
260 int, const u_char *, u_char *, int));
261 int res_query __P((const char *, int, int, u_char *, int));
262 int res_querydomain __P((const char *, const char *, int, int,
264 int res_search __P((const char *, int, int, u_char *, int));
265 int res_send __P((const u_char *, int, u_char *, int));
269 #if !defined(SHARED_LIBBIND) || defined(LIB)
271 * If libbind is a shared object (well, DLL anyway)
272 * these externs break the linker when resolv.h is
273 * included by a lib client (like named)
274 * Make them go away if a client is including this
277 extern const struct res_sym __p_key_syms[];
278 extern const struct res_sym __p_cert_syms[];
279 extern const struct res_sym __p_class_syms[];
280 extern const struct res_sym __p_type_syms[];
281 extern const struct res_sym __p_rcode_syms[];
282 #endif /* SHARED_LIBBIND */
284 #define b64_ntop __b64_ntop
285 #define b64_pton __b64_pton
286 #define dn_comp __dn_comp
287 #define dn_count_labels __dn_count_labels
288 #define dn_expand __dn_expand
289 #define dn_skipname __dn_skipname
290 #define fp_resstat __fp_resstat
291 #define loc_aton __loc_aton
292 #define loc_ntoa __loc_ntoa
293 #define p_cdname __p_cdname
294 #define p_cdnname __p_cdnname
295 #define p_class __p_class
296 #define p_fqname __p_fqname
297 #define p_fqnname __p_fqnname
298 #define p_option __p_option
299 #define p_secstodate __p_secstodate
300 #define p_section __p_section
301 #define p_time __p_time
302 #define p_type __p_type
303 #define p_rcode __p_rcode
304 #define putlong __putlong
305 #define putshort __putshort
306 #define res_dnok __res_dnok
307 #define res_hnok __res_hnok
308 #define res_hostalias __res_hostalias
309 #define res_mailok __res_mailok
310 #define res_nameinquery __res_nameinquery
311 #define res_nclose __res_nclose
312 #define res_ninit __res_ninit
313 #define res_nmkquery __res_nmkquery
314 #define res_npquery __res_npquery
315 #define res_nquery __res_nquery
316 #define res_nquerydomain __res_nquerydomain
317 #define res_nsearch __res_nsearch
318 #define res_nsend __res_nsend
319 #define res_nisourserver __res_nisourserver
320 #define res_ownok __res_ownok
321 #define res_queriesmatch __res_queriesmatch
322 #define res_randomid __res_randomid
323 #define sym_ntop __sym_ntop
324 #define sym_ntos __sym_ntos
325 #define sym_ston __sym_ston
327 int res_hnok __P((const char *));
328 int res_ownok __P((const char *));
329 int res_mailok __P((const char *));
330 int res_dnok __P((const char *));
331 int sym_ston __P((const struct res_sym *, const char *, int *));
332 const char * sym_ntos __P((const struct res_sym *, int, int *));
333 const char * sym_ntop __P((const struct res_sym *, int, int *));
334 int b64_ntop __P((u_char const *, size_t, char *, size_t));
335 int b64_pton __P((char const *, u_char *, size_t));
336 int loc_aton __P((const char *ascii, u_char *binary));
337 const char * loc_ntoa __P((const u_char *binary, char *ascii));
338 int dn_skipname __P((const u_char *, const u_char *));
339 void putlong __P((u_int32_t, u_char *));
340 void putshort __P((u_int16_t, u_char *));
341 const char * p_class __P((int));
342 const char * p_time __P((u_int32_t));
343 const char * p_type __P((int));
344 const char * p_rcode __P((int));
345 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
346 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
347 const u_char * p_fqnname __P((const u_char *cp, const u_char *msg,
349 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
350 const char * p_option __P((u_long option));
351 char * p_secstodate __P((u_long));
352 int dn_count_labels __P((const char *));
353 int dn_comp __P((const char *, u_char *, int,
354 u_char **, u_char **));
355 int dn_expand __P((const u_char *, const u_char *, const u_char *,
357 u_int res_randomid __P((void));
358 int res_nameinquery __P((const char *, int, int,
359 const u_char *, const u_char *));
360 int res_queriesmatch __P((const u_char *, const u_char *,
361 const u_char *, const u_char *));
362 const char * p_section __P((int section, int opcode));
363 /* Things involving a resolver context. */
364 int res_ninit __P((res_state));
365 int res_nisourserver __P((const res_state,
366 const struct sockaddr_in *));
367 void fp_resstat __P((const res_state, FILE *));
368 void res_npquery __P((const res_state, const u_char *, int, FILE *));
369 const char * res_hostalias __P((const res_state, const char *,
371 int res_nquery __P((res_state,
372 const char *, int, int, u_char *, int));
373 int res_nsearch __P((res_state, const char *, int,
374 int, u_char *, int));
375 int res_nquerydomain __P((res_state,
376 const char *, const char *, int, int,
378 int res_nmkquery __P((res_state,
379 int, const char *, int, int, const u_char *,
380 int, const u_char *, u_char *, int));
381 int res_nsend __P((res_state, const u_char *, int, u_char *, int));
382 void res_nclose __P((res_state));
385 #endif /* !_RESOLV_H_ */