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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)__PMT((struct sockaddr_in * const *ns,
170 const u_char **query,
176 typedef res_sendhookact (*res_send_rhook)__PMT((const struct sockaddr_in *ns,
184 int number; /* Identifying number, like T_MX */
185 char * name; /* Its symbolic name, like "MX" */
186 char * humanname; /* Its fun name, like "mail exchanger" */
189 extern struct __res_state _res;
190 extern const struct res_sym __p_class_syms[];
191 extern const struct res_sym __p_type_syms[];
193 /* Private routines shared between libc/net, named, nslookup and others. */
194 #define res_hnok __res_hnok
195 #define res_ownok __res_ownok
196 #define res_mailok __res_mailok
197 #define res_dnok __res_dnok
198 #define sym_ston __sym_ston
199 #define sym_ntos __sym_ntos
200 #define sym_ntop __sym_ntop
201 #define b64_ntop __b64_ntop
202 #define b64_pton __b64_pton
203 #define loc_ntoa __loc_ntoa
204 #define loc_aton __loc_aton
205 #define dn_skipname __dn_skipname
206 #define fp_resstat __fp_resstat
207 #define fp_query __fp_query
208 #define fp_nquery __fp_nquery
209 #define hostalias __hostalias
210 #define putlong __putlong
211 #define putshort __putshort
212 #define p_class __p_class
213 #define p_time __p_time
214 #define p_type __p_type
215 #define p_query __p_query
216 #define p_cdnname __p_cdnname
217 #define p_cdname __p_cdname
218 #define p_fqnname __p_fqnname
219 #define p_fqname __p_fqname
221 #define p_option __p_option
222 #define p_secstodate __p_secstodate
223 #define dn_count_labels __dn_count_labels
224 #define dn_comp __dn_comp
225 #define res_randomid __res_randomid
226 #define res_send __res_send
227 #define res_isourserver __res_isourserver
228 #define res_nameinquery __res_nameinquery
229 #define res_queriesmatch __res_queriesmatch
230 #define res_close __res_close
232 #ifdef BIND_RES_POSIX3
233 #define dn_expand __dn_expand
234 #define res_init __res_init
235 #define res_query __res_query
236 #define res_search __res_search
237 #define res_querydomain __res_querydomain
238 #define res_mkquery __res_mkquery
242 int res_hnok __P((const char *));
243 int res_ownok __P((const char *));
244 int res_mailok __P((const char *));
245 int res_dnok __P((const char *));
246 int sym_ston __P((const struct res_sym *, char *, int *));
247 const char * sym_ntos __P((const struct res_sym *, int, int *));
248 const char * sym_ntop __P((const struct res_sym *, int, int *));
249 int b64_ntop __P((u_char const *, size_t, char *, size_t));
250 int b64_pton __P((char const *, u_char *, size_t));
251 int loc_aton __P((const char *, u_char *));
252 const char * loc_ntoa __P((const u_char *, char *));
253 int dn_skipname __P((const u_char *, const u_char *));
254 void fp_resstat __P((struct __res_state *, FILE *));
255 void fp_query __P((const u_char *, FILE *));
256 void fp_nquery __P((const u_char *, int, FILE *));
257 const char * hostalias __P((const char *));
258 void putlong __P((u_int32_t, u_char *));
259 void putshort __P((u_int16_t, u_char *));
260 const char * p_class __P((int));
261 const char * p_time __P((u_int32_t));
262 const char * p_type __P((int));
263 void p_query __P((const u_char *));
264 const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *));
265 const u_char * p_cdname __P((const u_char *, const u_char *, FILE *));
266 const u_char * p_fqnname __P((const u_char *cp, const u_char *msg,
268 const u_char * p_fqname __P((const u_char *, const u_char *, FILE *));
269 const u_char * p_rr __P((const u_char *, const u_char *, FILE *));
270 const char * p_option __P((u_long option));
271 char * p_secstodate __P((u_long));
272 int dn_count_labels __P((char *));
273 int dn_comp __P((const char *, u_char *, int,
274 u_char **, u_char **));
275 int dn_expand __P((const u_char *, const u_char *, const u_char *,
277 int res_init __P((void));
278 u_int res_randomid __P((void));
279 int res_query __P((const char *, int, int, u_char *, int));
280 int res_search __P((const char *, int, int, u_char *, int));
281 int res_querydomain __P((const char *, const char *, int, int,
283 int res_mkquery __P((int, const char *, int, int, const u_char *, int,
284 const u_char *, u_char *, int));
285 int res_send __P((const u_char *, int, u_char *, int));
286 int res_isourserver __P((const struct sockaddr_in *));
287 int res_nameinquery __P((const char *, int, int,
288 const u_char *, const u_char *));
289 int res_queriesmatch __P((const u_char *, const u_char *,
290 const u_char *, const u_char *));
291 void res_close __P((void));
294 #endif /* resolv.h */