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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 $
54 * $Id: resolv.h,v 1.16 1998/06/11 12:52:45 peter Exp $
60 #include <sys/param.h>
61 #include <sys/types.h>
62 #include <sys/cdefs.h>
66 * Revision information. This is the release date in YYYYMMDD format.
67 * It can change every day so the right thing to do with it is use it
68 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
69 * compare for equality; rather, use it to determine whether your resolver
70 * is new enough to contain a certain feature.
73 #define __RES 19960801
76 * Resolver configuration file.
77 * Normally not present, but may contain the address of the
78 * inital name server(s) to query and the domain search list.
82 #define _PATH_RESCONF "/etc/resolv.conf"
86 * Global defines and variables for resolver stub.
88 #define MAXNS 3 /* max # name servers we'll track */
89 #define MAXDFLSRCH 3 /* # default domain levels to try */
90 #define MAXDNSRCH 6 /* max # domains in search path */
91 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
93 #define RES_TIMEOUT 5 /* min. seconds between retries */
94 #define MAXRESOLVSORT 10 /* number of net to sort on */
95 #define RES_MAXNDOTS 15 /* should reflect bit field size */
98 int retrans; /* retransmition time interval */
99 int retry; /* number of times to retransmit */
100 u_long options; /* option flags - see below. */
101 int nscount; /* number of name servers */
103 nsaddr_list[MAXNS]; /* address of name server */
104 #define nsaddr nsaddr_list[0] /* for backward compatibility */
105 u_short id; /* current message id */
106 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
107 char defdname[256]; /* default domain (deprecated) */
108 u_long pfcode; /* RES_PRF_ flags - see below. */
109 unsigned ndots:4; /* threshold for initial abs. query */
110 unsigned nsort:4; /* number of elements in sort_list[] */
115 } sort_list[MAXRESOLVSORT];
116 char pad[72]; /* on an i386 this means 512b total */
120 * Resolver options (keep these in synch with res_debug.c, please)
122 #define RES_INIT 0x00000001 /* address initialized */
123 #define RES_DEBUG 0x00000002 /* print debug messages */
124 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
125 #define RES_USEVC 0x00000008 /* use virtual circuit */
126 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
127 #define RES_IGNTC 0x00000020 /* ignore truncation errors */
128 #define RES_RECURSE 0x00000040 /* recursion desired */
129 #define RES_DEFNAMES 0x00000080 /* use default domain name */
130 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
131 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
132 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
133 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
134 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
135 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
136 #define RES_NOTLDQUERY 0x00004000 /* Don't query TLD names */
138 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
141 * Resolver "pfcode" values. Used by dig.
143 #define RES_PRF_STATS 0x00000001
144 #define RES_PRF_UPDATE 0x00000002
145 #define RES_PRF_CLASS 0x00000004
146 #define RES_PRF_CMD 0x00000008
147 #define RES_PRF_QUES 0x00000010
148 #define RES_PRF_ANS 0x00000020
149 #define RES_PRF_AUTH 0x00000040
150 #define RES_PRF_ADD 0x00000080
151 #define RES_PRF_HEAD1 0x00000100
152 #define RES_PRF_HEAD2 0x00000200
153 #define RES_PRF_TTLID 0x00000400
154 #define RES_PRF_HEADX 0x00000800
155 #define RES_PRF_QUERY 0x00001000
156 #define RES_PRF_REPLY 0x00002000
157 #define RES_PRF_INIT 0x00004000
160 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
163 typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr_in * const *ns,
164 const u_char **query,
170 typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr_in *ns,
178 int number; /* Identifying number, like T_MX */
179 char * name; /* Its symbolic name, like "MX" */
180 char * humanname; /* Its fun name, like "mail exchanger" */
183 extern struct __res_state _res;
184 extern const struct res_sym __p_class_syms[];
185 extern const struct res_sym __p_type_syms[];
187 /* Private routines shared between libc/net, named, nslookup and others. */
188 #define res_hnok __res_hnok
189 #define res_ownok __res_ownok
190 #define res_mailok __res_mailok
191 #define res_dnok __res_dnok
192 #define sym_ston __sym_ston
193 #define sym_ntos __sym_ntos
194 #define sym_ntop __sym_ntop
195 #define b64_ntop __b64_ntop
196 #define b64_pton __b64_pton
197 #define loc_ntoa __loc_ntoa
198 #define loc_aton __loc_aton
199 #define fp_resstat __fp_resstat
200 #define p_query __p_query
201 #define dn_skipname __dn_skipname
202 #define fp_resstat __fp_resstat
203 #define fp_query __fp_query
204 #define fp_nquery __fp_nquery
205 #define hostalias __hostalias
206 #define putlong __putlong
207 #define putshort __putshort
208 #define p_class __p_class
209 #define p_time __p_time
210 #define p_type __p_type
211 #define p_query __p_query
212 #define p_cdnname __p_cdnname
213 #define p_section __p_section
214 #define p_cdname __p_cdname
215 #define p_fqnname __p_fqnname
216 #define p_fqname __p_fqname
217 #define p_option __p_option
218 #define p_secstodate __p_secstodate
219 #define dn_count_labels __dn_count_labels
220 #define dn_comp __dn_comp
221 #define dn_expand __dn_expand
222 #define res_init __res_init
223 #define res_randomid __res_randomid
224 #define res_query __res_query
225 #define res_search __res_search
226 #define res_querydomain __res_querydomain
227 #define res_mkquery __res_mkquery
228 #define res_send __res_send
229 #define res_isourserver __res_isourserver
230 #define res_nameinquery __res_nameinquery
231 #define res_queriesmatch __res_queriesmatch
232 #define res_close __res_close
233 #define res_mkupdate __res_mkupdate
234 #define res_mkupdrec __res_mkupdrec
235 #define res_freeupdrec __res_freeupdrec
238 int res_hnok __P((const char *));
239 int res_ownok __P((const char *));
240 int res_mailok __P((const char *));
241 int res_dnok __P((const char *));
242 int sym_ston __P((const struct res_sym *, const char *, int *));
243 const char * sym_ntos __P((const struct res_sym *, int, int *));
244 const char * sym_ntop __P((const struct res_sym *, int, int *));
245 int b64_ntop __P((u_char const *, size_t, char *, size_t));
246 int b64_pton __P((char const *, u_char *, size_t));
247 int loc_aton __P((const char *, u_char *));
248 const char * loc_ntoa __P((const u_char *, char *));
249 int dn_skipname __P((const u_char *, const u_char *));
250 void fp_resstat __P((struct __res_state *, FILE *));
251 void fp_query __P((const u_char *, FILE *));
252 void fp_nquery __P((const u_char *, int, FILE *));
253 const char * hostalias __P((const char *));
254 void putlong __P((u_int32_t, u_char *));
255 void putshort __P((u_int16_t, u_char *));
256 const char * p_class __P((int));
257 const char * p_time __P((u_int32_t));
258 const char * p_type __P((int));
259 void p_query __P((const u_char *));
260 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
261 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
262 const u_char * p_fqnname __P((const u_char *, const u_char *,
264 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
265 const char * p_option __P((u_long));
266 char * p_secstodate __P((u_long));
267 int dn_count_labels __P((const char *));
268 int dn_comp __P((const char *, u_char *, int,
269 u_char **, u_char **));
270 int dn_expand __P((const u_char *, const u_char *, const u_char *,
272 int res_init __P((void));
273 u_int res_randomid __P((void));
274 int res_query __P((const char *, int, int, u_char *, int));
275 int res_search __P((const char *, int, int, u_char *, int));
276 int res_querydomain __P((const char *, const char *, int, int,
278 int res_mkquery __P((int, const char *, int, int, const u_char *,
279 int, const u_char *, u_char *, int));
280 int res_send __P((const u_char *, int, u_char *, int));
281 int res_isourserver __P((const struct sockaddr_in *));
282 int res_nameinquery __P((const char *, int, int,
283 const u_char *, const u_char *));
284 int res_queriesmatch __P((const u_char *, const u_char *,
285 const u_char *, const u_char *));
286 void res_close __P((void));
287 const char * p_section __P((int, int));
288 /* XXX The following depend on the ns_updrec typedef in arpa/nameser.h */
289 #ifdef _ARPA_NAMESER_H_
290 int res_update __P((ns_updrec *));
291 int res_mkupdate __P((ns_updrec *, u_char *, int));
292 ns_updrec * res_mkupdrec __P((int, const char *, u_int, u_int, u_long));
293 void res_freeupdrec __P((ns_updrec *));
297 #endif /* !_RESOLV_H_ */