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53 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
62 #include <sys/param.h>
63 #if (!defined(BSD)) || (BSD < 199306)
64 # include <sys/bitypes.h>
66 # include <sys/types.h>
69 #include <netinet/in.h>
72 * Revision information. This is the release date in YYYYMMDD format.
73 * It can change every day so the right thing to do with it is use it
74 * in preprocessor commands such as "#if (__RES > 19931104)". Do not
75 * compare for equality; rather, use it to determine whether your resolver
76 * is new enough to contain a certain feature.
79 #define __RES 19960801
82 * Resolver configuration file.
83 * Normally not present, but may contain the address of the
84 * initial name server(s) to query and the domain search list.
88 #define _PATH_RESCONF "/etc/resolv.conf"
92 * Global defines and variables for resolver stub.
94 #define MAXNS 3 /* max # name servers we'll track */
95 #define MAXDFLSRCH 3 /* # default domain levels to try */
96 #define MAXDNSRCH 6 /* max # domains in search path */
97 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
99 #define RES_TIMEOUT 5 /* min. seconds between retries */
100 #define MAXRESOLVSORT 10 /* number of net to sort on */
101 #define RES_MAXNDOTS 15 /* should reflect bit field size */
104 int retrans; /* retransmission time interval */
105 int retry; /* number of times to retransmit */
106 u_long options; /* option flags - see below. */
107 int nscount; /* number of name servers */
109 nsaddr_list[MAXNS]; /* address of name server */
110 #define nsaddr nsaddr_list[0] /* for backward compatibility */
111 u_short id; /* current message id */
112 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
113 char defdname[256]; /* default domain (deprecated) */
114 u_long pfcode; /* RES_PRF_ flags - see below. */
115 unsigned ndots:4; /* threshold for initial abs. query */
116 unsigned nsort:4; /* number of elements in sort_list[] */
121 } sort_list[MAXRESOLVSORT];
122 char pad[72]; /* on an i386 this means 512b total */
126 * Resolver options (keep these in synch with res_debug.c, please)
128 #define RES_INIT 0x00000001 /* address initialized */
129 #define RES_DEBUG 0x00000002 /* print debug messages */
130 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
131 #define RES_USEVC 0x00000008 /* use virtual circuit */
132 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
133 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
134 #define RES_RECURSE 0x00000040 /* recursion desired */
135 #define RES_DEFNAMES 0x00000080 /* use default domain name */
136 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
137 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
138 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
139 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
140 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
141 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
143 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
146 * Resolver "pfcode" values. Used by dig.
148 #define RES_PRF_STATS 0x00000001
150 #define RES_PRF_CLASS 0x00000004
151 #define RES_PRF_CMD 0x00000008
152 #define RES_PRF_QUES 0x00000010
153 #define RES_PRF_ANS 0x00000020
154 #define RES_PRF_AUTH 0x00000040
155 #define RES_PRF_ADD 0x00000080
156 #define RES_PRF_HEAD1 0x00000100
157 #define RES_PRF_HEAD2 0x00000200
158 #define RES_PRF_TTLID 0x00000400
159 #define RES_PRF_HEADX 0x00000800
160 #define RES_PRF_QUERY 0x00001000
161 #define RES_PRF_REPLY 0x00002000
162 #define RES_PRF_INIT 0x00004000
165 /* hooks are still experimental as of 4.9.2 */
166 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
169 typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
170 const u_char **query, int *querylen,
171 u_char *ans, int anssiz,
174 typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
175 const u_char *query, int querylen,
176 u_char *ans, int anssiz,
180 int number; /* Identifying number, like T_MX */
181 char * name; /* Its symbolic name, like "MX" */
182 char * humanname; /* Its fun name, like "mail exchanger" */
185 extern struct __res_state _res;
186 extern const struct res_sym __p_class_syms[];
187 extern const struct res_sym __p_type_syms[];
189 /* Private routines shared between libc/net, named, nslookup and others. */
190 #define res_hnok __res_hnok
191 #define res_ownok __res_ownok
192 #define res_mailok __res_mailok
193 #define res_dnok __res_dnok
194 #define sym_ston __sym_ston
195 #define sym_ntos __sym_ntos
196 #define sym_ntop __sym_ntop
197 #define b64_ntop __b64_ntop
198 #define b64_pton __b64_pton
199 #define loc_ntoa __loc_ntoa
200 #define loc_aton __loc_aton
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_cdname __p_cdname
214 #define p_fqnname __p_fqnname
215 #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 res_randomid __res_randomid
222 #define res_send __res_send
223 #define res_isourserver __res_isourserver
224 #define res_nameinquery __res_nameinquery
225 #define res_queriesmatch __res_queriesmatch
226 #define res_close __res_close
228 #ifdef BIND_RES_POSIX3
229 #define dn_expand __dn_expand
230 #define res_init __res_init
231 #define res_query __res_query
232 #define res_search __res_search
233 #define res_querydomain __res_querydomain
234 #define res_mkquery __res_mkquery
238 int res_hnok (const char *) __THROW;
239 int res_ownok (const char *) __THROW;
240 int res_mailok (const char *) __THROW;
241 int res_dnok (const char *) __THROW;
242 int sym_ston (const struct res_sym *, char *, int *) __THROW;
243 const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
244 const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
245 int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
246 int b64_pton (char const *, u_char *, size_t) __THROW;
247 int loc_aton (const char *, u_char *) __THROW;
248 const char * loc_ntoa (const u_char *, char *) __THROW;
249 int dn_skipname (const u_char *, const u_char *) __THROW;
250 void fp_resstat (struct __res_state *, FILE *) __THROW;
251 void fp_query (const u_char *, FILE *) __THROW;
252 void fp_nquery (const u_char *, int, FILE *) __THROW;
253 const char * hostalias (const char *) __THROW;
254 void putlong (u_int32_t, u_char *) __THROW;
255 void putshort (u_int16_t, u_char *) __THROW;
256 const char * p_class (int) __THROW;
257 const char * p_time (u_int32_t) __THROW;
258 const char * p_type (int) __THROW;
259 void p_query (const u_char *) __THROW;
260 const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
262 const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
263 const u_char * p_fqnname (const u_char *cp, const u_char *msg,
264 int, char *, int) __THROW;
265 const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
266 const u_char * p_rr (const u_char *, const u_char *, FILE *) __THROW;
267 const char * p_option (u_long option) __THROW;
268 char * p_secstodate (u_long) __THROW;
269 int dn_count_labels (char *) __THROW;
270 int dn_comp (const char *, u_char *, int,
271 u_char **, u_char **) __THROW;
272 int dn_expand (const u_char *, const u_char *, const u_char *,
273 char *, int) __THROW;
274 int res_init (void) __THROW;
275 u_int res_randomid (void) __THROW;
276 int res_query (const char *, int, int, u_char *, int) __THROW;
277 int res_search (const char *, int, int, u_char *, int) __THROW;
278 int res_querydomain (const char *, const char *, int, int,
279 u_char *, int) __THROW;
280 int res_mkquery (int, const char *, int, int, const u_char *, int,
281 const u_char *, u_char *, int) __THROW;
282 int res_send (const u_char *, int, u_char *, int) __THROW;
283 int res_isourserver (const struct sockaddr_in *) __THROW;
284 int res_nameinquery (const char *, int, int,
285 const u_char *, const u_char *) __THROW;
286 int res_queriesmatch (const u_char *, const u_char *,
287 const u_char *, const u_char *) __THROW;
288 void res_close (void) __THROW;
291 #endif /* resolv.h */