1 /* $OpenBSD: resolv.h,v 1.7 2001/07/31 22:02:18 jakob Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * ++Copyright++ 1983, 1987, 1989, 1993 34 * - 35 * Copyright (c) 1983, 1987, 1989, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * - 66 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 67 * 68 * Permission to use, copy, modify, and distribute this software for any 69 * purpose with or without fee is hereby granted, provided that the above 70 * copyright notice and this permission notice appear in all copies, and that 71 * the name of Digital Equipment Corporation not be used in advertising or 72 * publicity pertaining to distribution of the document or software without 73 * specific, written prior permission. 74 * 75 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 76 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 77 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 78 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 79 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 80 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 81 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 82 * SOFTWARE. 83 * - 84 * --Copyright-- 85 */ 86 87 /* 88 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 89 * $From: resolv.h,v 8.17 1996/11/26 10:11:20 vixie Exp $ 90 */ 91 92 #ifndef _RESOLV_H_ 93 #define _RESOLV_H_ 94 95 /* #include <kernel/OS.h> */ 96 #include <sys/param.h> 97 #include <sys/types.h> 98 #include <sys/socket.h> 99 #include <stdio.h> 100 101 #ifdef __cplusplus 102 extern "C" { 103 #endif 104 105 /* 106 * Revision information. This is the release date in YYYYMMDD format. 107 * It can change every day so the right thing to do with it is use it 108 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 109 * compare for equality; rather, use it to determine whether your resolver 110 * is new enough to contain a certain feature. 111 */ 112 113 #define __RES 19960801 114 115 /* 116 * Resolver configuration file. 117 * Normally not present, but may contain the address of the 118 * initial name server(s) to query and the domain search list. 119 */ 120 121 #ifndef _PATH_RESCONF 122 #define _PATH_RESCONF "/etc/resolv.conf" 123 #endif 124 125 /* 126 * Global defines and variables for resolver stub. 127 */ 128 #define MAXNS 3 /* max # name servers we'll track */ 129 #define MAXDFLSRCH 3 /* # default domain levels to try */ 130 #define MAXDNSRCH 6 /* max # domains in search path */ 131 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 132 #define MAXDNSLUS 4 /* max # of host lookup types */ 133 134 #define RES_TIMEOUT 5 /* min. seconds between retries */ 135 #define MAXRESOLVSORT 10 /* number of net to sort on */ 136 #define RES_MAXNDOTS 15 /* should reflect bit field size */ 137 138 struct __res_state { 139 int retrans; /* retransmition time interval */ 140 int retry; /* number of times to retransmit */ 141 u_long options; /* option flags - see below. */ 142 int nscount; /* number of name servers */ 143 struct sockaddr_in 144 nsaddr_list[MAXNS]; /* address of name server */ 145 #define nsaddr nsaddr_list[0] /* for backward compatibility */ 146 u_short id; /* current message id */ 147 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 148 char defdname[256]; /* default domain (deprecated) */ 149 u_long pfcode; /* RES_PRF_ flags - see below. */ 150 unsigned ndots:4; /* threshold for initial abs. query */ 151 unsigned nsort:4; /* number of elements in sort_list[] */ 152 char unused[3]; 153 struct { 154 struct in_addr addr; 155 uint32 mask; 156 } sort_list[MAXRESOLVSORT]; 157 char lookups[MAXDNSLUS]; 158 char pad[68]; /* on an i386 this means 512b total */ 159 }; 160 161 #ifdef INET6 162 /* 163 * replacement of __res_state, separated to keep binary compatibility. 164 */ 165 struct __res_state_ext { 166 struct sockaddr_storage nsaddr_list[MAXNS]; 167 struct { 168 int af; /* address family for addr, mask */ 169 union { 170 struct in_addr ina; 171 struct in6_addr in6a; 172 } addr, mask; 173 } sort_list[MAXRESOLVSORT]; 174 }; 175 #endif 176 177 178 /* 179 * Resolver options (keep these in synch with res_debug.c, please) 180 */ 181 #define RES_INIT 0x00000001 /* address initialized */ 182 #define RES_DEBUG 0x00000002 /* print debug messages */ 183 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 184 #define RES_USEVC 0x00000008 /* use virtual circuit */ 185 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 186 #define RES_IGNTC 0x00000020 /* ignore trucation errors */ 187 #define RES_RECURSE 0x00000040 /* recursion desired */ 188 #define RES_DEFNAMES 0x00000080 /* use default domain name */ 189 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 190 #define RES_DNSRCH 0x00000200 /* search up local domain tree */ 191 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 192 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 193 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 194 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 195 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 196 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 */ 197 /* DNSSEC extensions: use higher bit to avoid conflict with ISC use */ 198 #define RES_USE_DNSSEC 0x20000000 /* use DNSSEC using OK bit in OPT */ 199 200 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 201 202 /* 203 * Resolver "pfcode" values. Used by dig. 204 */ 205 #define RES_PRF_STATS 0x00000001 206 /* 0x00000002 */ 207 #define RES_PRF_CLASS 0x00000004 208 #define RES_PRF_CMD 0x00000008 209 #define RES_PRF_QUES 0x00000010 210 #define RES_PRF_ANS 0x00000020 211 #define RES_PRF_AUTH 0x00000040 212 #define RES_PRF_ADD 0x00000080 213 #define RES_PRF_HEAD1 0x00000100 214 #define RES_PRF_HEAD2 0x00000200 215 #define RES_PRF_TTLID 0x00000400 216 #define RES_PRF_HEADX 0x00000800 217 #define RES_PRF_QUERY 0x00001000 218 #define RES_PRF_REPLY 0x00002000 219 #define RES_PRF_INIT 0x00004000 220 /* 0x00008000 */ 221 222 /* hooks are still experimental as of 4.9.2 */ 223 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 224 res_sendhookact; 225 226 typedef res_sendhookact (*res_send_qhook)(struct sockaddr_in * const *ns, 227 const uchar **query, 228 int *querylen, 229 uchar *ans, 230 int anssiz, 231 int *resplen); 232 233 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr_in *ns, 234 const uchar *query, 235 int querylen, 236 uchar *ans, 237 int anssiz, 238 int *resplen); 239 240 struct res_sym { 241 int number; /* Identifying number, like T_MX */ 242 char * name; /* Its symbolic name, like "MX" */ 243 char * humanname; /* Its fun name, like "mail exchanger" */ 244 }; 245 246 extern struct __res_state _res; 247 248 #ifdef INET6 249 extern struct __res_state_ext _res_ext; 250 #endif 251 extern const struct res_sym __p_class_syms[]; 252 extern const struct res_sym __p_type_syms[]; 253 254 /* Private routines shared between libc/net, named, nslookup and others. */ 255 #define res_hnok __res_hnok 256 #define res_ownok __res_ownok 257 #define res_mailok __res_mailok 258 #define res_dnok __res_dnok 259 #define sym_ston __sym_ston 260 #define sym_ntos __sym_ntos 261 #define sym_ntop __sym_ntop 262 #define b64_ntop __b64_ntop 263 #define b64_pton __b64_pton 264 #define loc_ntoa __loc_ntoa 265 #define loc_aton __loc_aton 266 #define dn_skipname __dn_skipname 267 #define fp_resstat __fp_resstat 268 #define fp_query __fp_query 269 #define fp_nquery __fp_nquery 270 #define hostalias __hostalias 271 #define putlong __putlong 272 #define putshort __putshort 273 #define p_class __p_class 274 #define p_time __p_time 275 #define p_type __p_type 276 #define p_query __p_query 277 #define p_cdnname __p_cdnname 278 #define p_cdname __p_cdname 279 #define p_fqnname __p_fqnname 280 #define p_fqname __p_fqname 281 #define p_rr __p_rr 282 #define p_option __p_option 283 #define p_secstodate __p_secstodate 284 #define dn_count_labels __dn_count_labels 285 #define dn_comp __dn_comp 286 #define res_randomid __res_randomid 287 #define res_send __res_send 288 #define res_isourserver __res_isourserver 289 #define res_nameinquery __res_nameinquery 290 #define res_queriesmatch __res_queriesmatch 291 #define res_close __res_close 292 #define res_opt __res_opt 293 294 #ifdef BIND_RES_POSIX3 295 #define dn_expand __dn_expand 296 #define res_init __res_init 297 #define res_query __res_query 298 #define res_search __res_search 299 #define res_querydomain __res_querydomain 300 #define res_mkquery __res_mkquery 301 #endif 302 303 int res_hnok (const char *); 304 int res_ownok (const char *); 305 int res_mailok (const char *); 306 int res_dnok (const char *); 307 int sym_ston (const struct res_sym *, char *, int *); 308 const char * sym_ntos (const struct res_sym *, int, int *); 309 const char * sym_ntop (const struct res_sym *, int, int *); 310 int b64_ntop (uchar const *, size_t, char *, size_t); 311 int b64_pton (char const *, uchar *, size_t); 312 int loc_aton (const char *, uchar *); 313 const char * loc_ntoa (const uchar *, char *); 314 int dn_skipname (const uchar *, const uchar *); 315 void fp_resstat (struct __res_state *, FILE *); 316 void fp_query (const uchar *, FILE *); 317 void fp_nquery (const uchar *, int, FILE *); 318 const char * hostalias (const char *); 319 void putlong (uint32, uchar *); 320 void putshort (uint16, uchar *); 321 const char * p_class (int); 322 const char * p_time (uint32); 323 const char * p_type (int); 324 void p_query (const uchar *); 325 const uchar * p_cdnname (const uchar *, const uchar *, int, FILE *); 326 const uchar * p_cdname (const uchar *, const uchar *, FILE *); 327 const uchar * p_fqnname (const uchar *cp, const uchar *msg, 328 int, char *, int); 329 const uchar * p_fqname (const uchar *, const uchar *, FILE *); 330 const uchar * p_rr (const uchar *, const uchar *, FILE *); 331 const char * p_option (u_long option); 332 char * p_secstodate (u_long); 333 int dn_count_labels (char *); 334 int dn_comp (const char *, uchar *, int, 335 uchar **, uchar **); 336 int dn_expand (const uchar *, const uchar *, const uchar *, 337 char *, int); 338 int res_init (void); 339 uint res_randomid (void); 340 int res_query (const char *, int, int, uchar *, int); 341 int res_search (const char *, int, int, uchar *, int); 342 int res_querydomain (const char *, const char *, int, int, 343 uchar *, int); 344 int res_mkquery (int, const char *, int, int, const uchar *, int, 345 const uchar *, uchar *, int); 346 int res_send (const uchar *, int, uchar *, int); 347 int res_isourserver (const struct sockaddr_in *); 348 int res_nameinquery (const char *, int, int, 349 const uchar *, const uchar *); 350 int res_queriesmatch (const uchar *, const uchar *, 351 const uchar *, const uchar *); 352 void res_close (void); 353 354 #ifdef __cplusplus 355 } 356 #endif 357 358 #endif /* !_RESOLV_H_ */ 359