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57 * @(#)resolv.h 8.1 (Berkeley) 6/2/93
64 #include <sys/param.h>
65 #if (!defined(BSD)) || (BSD < 199306)
66 # include <sys/bitypes.h>
68 # include <sys/types.h>
70 #include <sys/cdefs.h>
74 * revision information. this is the release date in YYYYMMDD format.
75 * it can change every day so the right thing to do with it is use it
76 * in preprocessor commands such as "#if (__RES > 19931104)". do not
77 * compare for equality; rather, use it to determine whether your resolver
78 * is new enough to contain a certain feature.
81 #define __RES 19960229
84 * Resolver configuration file.
85 * Normally not present, but may contain the address of the
86 * inital name server(s) to query and the domain search list.
90 #define _PATH_RESCONF "/etc/resolv.conf"
94 * Global defines and variables for resolver stub.
96 #define MAXNS 3 /* max # name servers we'll track */
97 #define MAXDFLSRCH 3 /* # default domain levels to try */
98 #define MAXDNSRCH 6 /* max # domains in search path */
99 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
101 #define RES_TIMEOUT 5 /* min. seconds between retries */
102 #define MAXRESOLVSORT 10 /* number of net to sort on */
103 #define RES_MAXNDOTS 15 /* should reflect bit field size */
106 int retrans; /* retransmition time interval */
107 int retry; /* number of times to retransmit */
108 u_long options; /* option flags - see below. */
109 int nscount; /* number of name servers */
111 nsaddr_list[MAXNS]; /* address of name server */
112 #define nsaddr nsaddr_list[0] /* for backward compatibility */
113 u_short id; /* current packet id */
114 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
115 char defdname[MAXDNAME]; /* default domain */
116 u_long pfcode; /* RES_PRF_ flags - see below. */
117 unsigned ndots:4; /* threshold for initial abs. query */
118 unsigned nsort:4; /* number of elements in sort_list[] */
123 } sort_list[MAXRESOLVSORT];
124 char pad[72]; /* On an i38this means 512b total. */
128 * Resolver options (keep these in synch with res_debug.c, please)
130 #define RES_INIT 0x00000001 /* address initialized */
131 #define RES_DEBUG 0x00000002 /* print debug messages */
132 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
133 #define RES_USEVC 0x00000008 /* use virtual circuit */
134 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
135 #define RES_IGNTC 0x00000020 /* ignore trucation errors */
136 #define RES_RECURSE 0x00000040 /* recursion desired */
137 #define RES_DEFNAMES 0x00000080 /* use default domain name */
138 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
139 #define RES_DNSRCH 0x00000200 /* search up local domain tree */
140 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */
141 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */
142 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
143 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
145 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
148 * Resolver "pfcode" values. Used by dig.
150 #define RES_PRF_STATS 0x00000001
152 #define RES_PRF_CLASS 0x00000004
153 #define RES_PRF_CMD 0x00000008
154 #define RES_PRF_QUES 0x00000010
155 #define RES_PRF_ANS 0x00000020
156 #define RES_PRF_AUTH 0x00000040
157 #define RES_PRF_ADD 0x00000080
158 #define RES_PRF_HEAD1 0x00000100
159 #define RES_PRF_HEAD2 0x00000200
160 #define RES_PRF_TTLID 0x00000400
161 #define RES_PRF_HEADX 0x00000800
162 #define RES_PRF_QUERY 0x00001000
163 #define RES_PRF_REPLY 0x00002000
164 #define RES_PRF_INIT 0x00004000
167 /* hooks are still experimental as of 4.9.2 */
168 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
171 typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr_in * const *ns,
172 const u_char **query,
178 typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr_in *ns,
185 extern struct __res_state _res;
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 loc_ntoa __loc_ntoa
193 #define loc_aton __loc_aton
194 #define dn_skipname __dn_skipname
195 #define fp_query __fp_query
196 #define fp_nquery __fp_nquery
197 #define hostalias __hostalias
198 #define putlong __putlong
199 #define putshort __putshort
200 #define p_class __p_class
201 #define p_time __p_time
202 #define p_type __p_type
203 #define p_cdnname __p_cdnname
204 #define p_cdname __p_cdname
205 #define p_fqname __p_fqname
207 #define p_option __p_option
208 #define res_randomid __res_randomid
209 #define res_isourserver __res_isourserver
210 #define res_nameinquery __res_nameinquery
211 #define res_queriesmatch __res_queriesmatch
213 int __res_hnok __P((const char *));
214 int __res_ownok __P((const char *));
215 int __res_mailok __P((const char *));
216 int __res_dnok __P((const char *));
217 int __loc_aton __P((const char *ascii, u_char *binary));
218 char * __loc_ntoa __P((const u_char *binary, char *ascii));
219 int __dn_skipname __P((const u_char *, const u_char *));
220 void __fp_resstat __P((struct __res_state *, FILE *));
221 void __fp_query __P((const u_char *, FILE *));
222 void __fp_nquery __P((const u_char *, int, FILE *));
223 char *__hostalias __P((const char *));
224 void __putlong __P((u_int32_t, u_char *));
225 void __putshort __P((u_int16_t, u_char *));
226 char *__p_time __P((u_int32_t));
227 void __p_query __P((const u_char *));
228 const u_char *__p_cdnname __P((const u_char *, const u_char *, int, FILE *));
229 const u_char *__p_cdname __P((const u_char *, const u_char *, FILE *));
230 const u_char *__p_fqname __P((const u_char *, const u_char *, FILE *));
231 const u_char *__p_rr __P((const u_char *, const u_char *, FILE *));
232 const char *__p_type __P((int));
233 const char *__p_class __P((int));
234 const char *__p_option __P((u_long option));
235 int dn_comp __P((const char *, u_char *, int, u_char **, u_char **));
236 int dn_expand __P((const u_char *, const u_char *, const u_char *,
238 int res_init __P((void));
239 u_int16_t res_randomid __P((void));
240 int res_query __P((const char *, int, int, u_char *, int));
241 int res_search __P((const char *, int, int, u_char *, int));
242 int res_querydomain __P((const char *, const char *, int, int,
244 int res_mkquery __P((int, const char *, int, int, const u_char *, int,
245 const u_char *, u_char *, int));
246 int res_send __P((const u_char *, int, u_char *, int));
247 int res_isourserver __P((const struct sockaddr_in *));
248 int res_nameinquery __P((const char *, int, int,
249 const u_char *, const u_char *));
250 int res_queriesmatch __P((const u_char *, const u_char *,
251 const u_char *, const u_char *));
254 #endif /* !_RESOLV_H_ */