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54 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
55 * From Id: resolv.h,v 8.18 1997/06/01 20:34:32 vixie Exp
56 * $Id: resolv.h,v 1.12 1997/05/07 20:00:10 eivind Exp $
62 #include <sys/param.h>
63 #include <sys/types.h>
64 #include <sys/cdefs.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 19960801
78 * Resolver configuration file.
79 * Normally not present, but may contain the address of the
80 * inital name server(s) to query and the domain search list.
84 #define _PATH_RESCONF "/etc/resolv.conf"
88 * Global defines and variables for resolver stub.
90 #define MAXNS 3 /* max # name servers we'll track */
91 #define MAXDFLSRCH 3 /* # default domain levels to try */
92 #define MAXDNSRCH 6 /* max # domains in search path */
93 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
95 #define RES_TIMEOUT 5 /* min. seconds between retries */
96 #define MAXRESOLVSORT 10 /* number of net to sort on */
97 #define RES_MAXNDOTS 15 /* should reflect bit field size */
100 int retrans; /* retransmition time interval */
101 int retry; /* number of times to retransmit */
102 u_long options; /* option flags - see below. */
103 int nscount; /* number of name servers */
105 nsaddr_list[MAXNS]; /* address of name server */
106 #define nsaddr nsaddr_list[0] /* for backward compatibility */
107 u_short id; /* current message id */
108 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
109 char defdname[256]; /* default domain (deprecated) */
110 u_long pfcode; /* RES_PRF_ flags - see below. */
111 unsigned ndots:4; /* threshold for initial abs. query */
112 unsigned nsort:4; /* number of elements in sort_list[] */
117 } sort_list[MAXRESOLVSORT];
118 char pad[72]; /* on an i386 this means 512b total */
122 * Resolver options (keep these in synch with res_debug.c, please)
124 #define RES_INIT 0x00000001 /* address initialized */
125 #define RES_DEBUG 0x00000002 /* print debug messages */
126 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
127 #define RES_USEVC 0x00000008 /* use virtual circuit */
128 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
129 #define RES_IGNTC 0x00000020 /* ignore truncation errors */
130 #define RES_RECURSE 0x00000040 /* recursion desired */
131 #define RES_DEFNAMES 0x00000080 /* use default domain name */
132 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
133 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
134 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
135 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
136 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
137 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
139 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
142 * Resolver "pfcode" values. Used by dig.
144 #define RES_PRF_STATS 0x00000001
146 #define RES_PRF_CLASS 0x00000004
147 #define RES_PRF_CMD 0x00000008
148 #define RES_PRF_QUES 0x00000010
149 #define RES_PRF_ANS 0x00000020
150 #define RES_PRF_AUTH 0x00000040
151 #define RES_PRF_ADD 0x00000080
152 #define RES_PRF_HEAD1 0x00000100
153 #define RES_PRF_HEAD2 0x00000200
154 #define RES_PRF_TTLID 0x00000400
155 #define RES_PRF_HEADX 0x00000800
156 #define RES_PRF_QUERY 0x00001000
157 #define RES_PRF_REPLY 0x00002000
158 #define RES_PRF_INIT 0x00004000
161 /* hooks are still experimental as of 4.9.2 */
162 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
165 typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr_in * const *ns,
166 const u_char **query,
172 typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr_in *ns,
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_isourserver __res_isourserver
223 #define res_nameinquery __res_nameinquery
224 #define res_queriesmatch __res_queriesmatch
225 #define res_close __res_close
227 #ifdef BIND_RES_POSIX3
228 #define dn_expand __dn_expand
229 #define res_init __res_init
230 #define res_query __res_query
231 #define res_search __res_search
232 #define res_querydomain __res_querydomain
233 #define res_mkquery __res_mkquery
234 #define res_send __res_send
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 *, 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 u_char * p_rr __P((const u_char *, const u_char *, FILE *));
266 const char * p_option __P((u_long));
267 char * p_secstodate __P((u_long));
268 int dn_count_labels __P((char *));
269 int dn_comp __P((const char *, u_char *, int,
270 u_char **, u_char **));
271 int dn_expand __P((const u_char *, const u_char *, const u_char *,
273 int res_init __P((void));
274 u_int res_randomid __P((void));
275 int res_query __P((const char *, int, int, u_char *, int));
276 int res_search __P((const char *, int, int, u_char *, int));
277 int res_querydomain __P((const char *, const char *, int, int,
279 int res_mkquery __P((int, const char *, int, int, const u_char *,
280 int, const u_char *, u_char *, int));
281 int res_send __P((const u_char *, int, u_char *, int));
282 int res_isourserver __P((const struct sockaddr_in *));
283 int res_nameinquery __P((const char *, int, int,
284 const u_char *, const u_char *));
285 int res_queriesmatch __P((const u_char *, const u_char *,
286 const u_char *, const u_char *));
287 void res_close __P((void));
290 #endif /* !_RESOLV_H_ */