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52 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
53 * From Id: resolv.h,v 8.12 1998/04/28 19:36:46 halley Exp $
60 #include <sys/param.h>
61 #include <sys/types.h>
62 #include <sys/cdefs.h>
63 #include <sys/socket.h>
67 * Revision information. This is the release date in YYYYMMDD format.
68 * It can change every day so the right thing to do with it is use it
69 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
70 * compare for equality; rather, use it to determine whether your resolver
71 * is new enough to contain a certain feature.
74 #define __RES 19960801
77 * Resolver configuration file.
78 * Normally not present, but may contain the address of the
79 * inital name server(s) to query and the domain search list.
83 #define _PATH_RESCONF "/etc/resolv.conf"
87 * Global defines and variables for resolver stub.
89 #define MAXNS 3 /* max # name servers we'll track */
90 #define MAXDFLSRCH 3 /* # default domain levels to try */
91 #define MAXDNSRCH 6 /* max # domains in search path */
92 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
94 #define RES_TIMEOUT 5 /* min. seconds between retries */
95 #define RES_DFLRETRY 4 /* retries per each name server */
96 #define MAXRESOLVSORT 10 /* number of net to sort on */
97 #define RES_MAXNDOTS 15 /* should reflect bit field size */
98 #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
99 #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
102 int retrans; /* retransmition time interval */
103 int retry; /* number of times to retransmit */
104 u_long options; /* option flags - see below. */
105 int nscount; /* number of name servers */
107 nsaddr_list[MAXNS]; /* address of name server */
108 #define nsaddr nsaddr_list[0] /* for backward compatibility */
109 u_short id; /* current message id */
110 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
111 char defdname[256]; /* default domain (deprecated) */
112 u_long pfcode; /* RES_PRF_ flags - see below. */
113 unsigned ndots:4; /* threshold for initial abs. query */
114 unsigned nsort:4; /* number of elements in sort_list[] */
119 } sort_list[MAXRESOLVSORT];
120 char pad[72]; /* on an i386 this means 512b total */
125 * replacement of __res_state, separated to keep binary compatibility.
127 struct __res_state_ext {
128 struct sockaddr_storage nsaddr_list[MAXNS];
130 int af; /* address family for addr, mask */
133 struct in6_addr in6a;
135 } sort_list[MAXRESOLVSORT];
139 * Resolver options (keep these in synch with res_debug.c, please)
141 #define RES_INIT 0x00000001 /* address initialized */
142 #define RES_DEBUG 0x00000002 /* print debug messages */
143 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
144 #define RES_USEVC 0x00000008 /* use virtual circuit */
145 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
146 #define RES_IGNTC 0x00000020 /* ignore truncation errors */
147 #define RES_RECURSE 0x00000040 /* recursion desired */
148 #define RES_DEFNAMES 0x00000080 /* use default domain name */
149 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
150 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
151 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
152 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
153 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
154 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
155 #define RES_NOTLDQUERY 0x00004000 /* Don't query TLD names */
156 /* KAME extensions: use higher bit to avoid conflict with ISC use */
157 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 */
159 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
162 * Resolver "pfcode" values. Used by dig.
164 #define RES_PRF_STATS 0x00000001
165 #define RES_PRF_UPDATE 0x00000002
166 #define RES_PRF_CLASS 0x00000004
167 #define RES_PRF_CMD 0x00000008
168 #define RES_PRF_QUES 0x00000010
169 #define RES_PRF_ANS 0x00000020
170 #define RES_PRF_AUTH 0x00000040
171 #define RES_PRF_ADD 0x00000080
172 #define RES_PRF_HEAD1 0x00000100
173 #define RES_PRF_HEAD2 0x00000200
174 #define RES_PRF_TTLID 0x00000400
175 #define RES_PRF_HEADX 0x00000800
176 #define RES_PRF_QUERY 0x00001000
177 #define RES_PRF_REPLY 0x00002000
178 #define RES_PRF_INIT 0x00004000
181 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
184 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *ns,
185 const u_char **query,
191 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *ns,
199 int number; /* Identifying number, like T_MX */
200 char * name; /* Its symbolic name, like "MX" */
201 char * humanname; /* Its fun name, like "mail exchanger" */
205 extern struct __res_state *___res(void);
206 extern struct __res_state_ext *___res_ext(void);
208 #define _res (*___res())
210 #define _res_ext (*___res_ext())
212 extern const struct res_sym __p_class_syms[];
213 extern const struct res_sym __p_type_syms[];
215 /* Private routines shared between libc/net, named, nslookup and others. */
216 #define res_hnok __res_hnok
217 #define res_ownok __res_ownok
218 #define res_mailok __res_mailok
219 #define res_dnok __res_dnok
220 #define sym_ston __sym_ston
221 #define sym_ntos __sym_ntos
222 #define sym_ntop __sym_ntop
223 #define b64_ntop __b64_ntop
224 #define b64_pton __b64_pton
225 #define loc_ntoa __loc_ntoa
226 #define loc_aton __loc_aton
227 #define fp_resstat __fp_resstat
228 #define p_query __p_query
229 #define dn_skipname __dn_skipname
230 #define fp_resstat __fp_resstat
231 #define fp_query __fp_query
232 #define fp_nquery __fp_nquery
233 #define hostalias __hostalias
234 #define putlong __putlong
235 #define putshort __putshort
236 #define p_class __p_class
237 #define p_time __p_time
238 #define p_type __p_type
239 #define p_query __p_query
240 #define p_cdnname __p_cdnname
241 #define p_section __p_section
242 #define p_cdname __p_cdname
243 #define p_fqnname __p_fqnname
244 #define p_fqname __p_fqname
245 #define p_option __p_option
246 #define p_secstodate __p_secstodate
247 #define dn_count_labels __dn_count_labels
248 #define dn_comp __dn_comp
249 #define dn_expand __dn_expand
250 #define res_init __res_init
251 #define res_randomid __res_randomid
252 #define res_query __res_query
253 #define res_search __res_search
254 #define res_querydomain __res_querydomain
255 #define res_mkquery __res_mkquery
256 #define res_send __res_send
257 #define res_isourserver __res_isourserver
258 #define res_nameinquery __res_nameinquery
259 #define res_queriesmatch __res_queriesmatch
260 #define res_close __res_close
261 #define res_opt __res_opt
262 #define res_mkupdate __res_mkupdate
263 #define res_mkupdrec __res_mkupdrec
264 #define res_freeupdrec __res_freeupdrec
267 int res_hnok(const char *);
268 int res_ownok(const char *);
269 int res_mailok(const char *);
270 int res_dnok(const char *);
271 int sym_ston(const struct res_sym *, const char *, int *);
272 const char * sym_ntos(const struct res_sym *, int, int *);
273 const char * sym_ntop(const struct res_sym *, int, int *);
274 int b64_ntop(u_char const *, size_t, char *, size_t);
275 int b64_pton(char const *, u_char *, size_t);
276 int loc_aton(const char *, u_char *);
277 const char * loc_ntoa(const u_char *, char *);
278 int dn_skipname(const u_char *, const u_char *);
279 void fp_resstat(struct __res_state *, FILE *);
280 void fp_query(const u_char *, FILE *);
281 void fp_nquery(const u_char *, int, FILE *);
282 const char * hostalias(const char *);
283 void putlong(u_int32_t, u_char *);
284 void putshort(u_int16_t, u_char *);
285 const char * p_class(int);
286 const char * p_time(u_int32_t);
287 const char * p_type(int);
288 void p_query(const u_char *);
289 const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *);
290 const u_char * p_cdname(const u_char *, const u_char *, FILE *);
291 const u_char * p_fqnname(const u_char *, const u_char *,
293 const u_char * p_fqname(const u_char *, const u_char *, FILE *);
294 const char * p_option(u_long);
295 char * p_secstodate(u_long);
296 int dn_count_labels(const char *);
297 int dn_comp(const char *, u_char *, int, u_char **, u_char **);
298 int dn_expand(const u_char *, const u_char *, const u_char *,
301 u_int res_randomid(void);
302 int res_query(const char *, int, int, u_char *, int);
303 int res_search(const char *, int, int, u_char *, int);
304 int res_querydomain(const char *, const char *, int, int,
306 int res_mkquery(int, const char *, int, int, const u_char *,
307 int, const u_char *, u_char *, int);
308 int res_send(const u_char *, int, u_char *, int);
309 int res_isourserver(const struct sockaddr_in *);
310 int res_nameinquery(const char *, int, int,
311 const u_char *, const u_char *);
312 int res_queriesmatch(const u_char *, const u_char *,
313 const u_char *, const u_char *);
314 void res_close(void);
315 int res_opt(int, u_char *, int, int);
316 const char * p_section(int, int);
317 /* XXX These must be exported for BIND4 compatibility. */
318 void __putlong(u_int32_t, u_char *);
319 void __putshort(u_int16_t, u_char *);
320 u_int32_t _getlong(const u_char *);
321 u_int16_t _getshort(const u_char *);
322 /* XXX The following depend on the ns_updrec typedef in arpa/nameser.h */
323 #ifdef _ARPA_NAMESER_H_
324 int res_update(ns_updrec *);
325 int res_mkupdate(ns_updrec *, u_char *, int);
326 ns_updrec * res_mkupdrec(int, const char *, u_int, u_int, u_long);
327 void res_freeupdrec(ns_updrec *);
331 #endif /* !_RESOLV_H_ */