1 /* $OpenBSD: resolv.h,v 1.18 2012/07/10 11:46:23 guenther 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. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * - 62 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 63 * 64 * Permission to use, copy, modify, and distribute this software for any 65 * purpose with or without fee is hereby granted, provided that the above 66 * copyright notice and this permission notice appear in all copies, and that 67 * the name of Digital Equipment Corporation not be used in advertising or 68 * publicity pertaining to distribution of the document or software without 69 * specific, written prior permission. 70 * 71 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 72 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 73 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 74 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 75 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 76 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 77 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 78 * SOFTWARE. 79 * - 80 * --Copyright-- 81 */ 82 83 /* 84 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 85 * $From: resolv.h,v 8.17 1996/11/26 10:11:20 vixie Exp $ 86 */ 87 88 #ifndef _RESOLV_H_ 89 #define _RESOLV_H_ 90 91 #include <sys/cdefs.h> 92 #include <sys/types.h> 93 #include <sys/socket.h> 94 #include <stdio.h> 95 96 /* 97 * Revision information. This is the release date in YYYYMMDD format. 98 * It can change every day so the right thing to do with it is use it 99 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 100 * compare for equality; rather, use it to determine whether your resolver 101 * is new enough to contain a certain feature. 102 */ 103 104 #define __RES 19960801 105 106 /* 107 * Resolver configuration file. 108 * Normally not present, but may contain the address of the 109 * initial name server(s) to query and the domain search list. 110 */ 111 112 #ifndef _PATH_RESCONF 113 #define _PATH_RESCONF "/etc/resolv.conf" 114 #endif 115 116 /* 117 * Global defines and variables for resolver stub. 118 */ 119 #define MAXNS 3 /* max # name servers we'll track */ 120 #define MAXDFLSRCH 3 /* # default domain levels to try */ 121 #define MAXDNSRCH 6 /* max # domains in search path */ 122 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 123 #define MAXDNSLUS 4 /* max # of host lookup types */ 124 125 #define RES_TIMEOUT 5 /* min. seconds between retries */ 126 #define MAXRESOLVSORT 10 /* number of net to sort on */ 127 #define RES_MAXNDOTS 15 /* should reflect bit field size */ 128 129 struct __res_state { 130 int retrans; /* retransmission time interval */ 131 int retry; /* number of times to retransmit */ 132 unsigned int options; /* option flags - see below. */ 133 int nscount; /* number of name servers */ 134 int family[2]; /* specifies which address 135 * families will be queried and 136 * in which order */ 137 struct sockaddr_in 138 nsaddr_list[MAXNS]; /* address of name server */ 139 #define nsaddr nsaddr_list[0] /* for backward compatibility */ 140 unsigned short id; /* current message id */ 141 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 142 char defdname[256]; /* default domain (deprecated) */ 143 unsigned int pfcode; /* RES_PRF_ flags - see below. */ 144 unsigned ndots:4; /* threshold for initial abs. query */ 145 unsigned nsort:4; /* number of elements in sort_list[] */ 146 char unused[3]; 147 struct { 148 struct in_addr addr; 149 u_int32_t mask; 150 } sort_list[MAXRESOLVSORT]; 151 char lookups[MAXDNSLUS]; 152 struct timespec restimespec; 153 time_t reschktime; 154 }; 155 156 #if 1 /* INET6 */ 157 /* 158 * replacement of __res_state, separated to keep binary compatibility. 159 */ 160 struct __res_state_ext { 161 struct sockaddr_storage nsaddr_list[MAXNS]; 162 struct { 163 int af; /* address family for addr, mask */ 164 union { 165 struct in_addr ina; 166 struct in6_addr in6a; 167 } addr, mask; 168 } sort_list[MAXRESOLVSORT]; 169 }; 170 #endif 171 172 173 /* 174 * Resolver options (keep these in synch with res_debug.c, please) 175 */ 176 #define RES_INIT 0x00000001 /* address initialized */ 177 #define RES_DEBUG 0x00000002 /* print debug messages */ 178 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 179 #define RES_USEVC 0x00000008 /* use virtual circuit */ 180 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 181 #define RES_IGNTC 0x00000020 /* ignore trucation errors */ 182 #define RES_RECURSE 0x00000040 /* recursion desired */ 183 #define RES_DEFNAMES 0x00000080 /* use default domain name */ 184 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 185 #define RES_DNSRCH 0x00000200 /* search up local domain tree */ 186 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 187 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 188 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 189 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 190 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 191 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 */ 192 /* DNSSEC extensions: use higher bit to avoid conflict with ISC use */ 193 #define RES_USE_DNSSEC 0x20000000 /* use DNSSEC using OK bit in OPT */ 194 195 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 196 197 /* 198 * Resolver "pfcode" values. Used by dig. 199 */ 200 #define RES_PRF_STATS 0x00000001 201 /* 0x00000002 */ 202 #define RES_PRF_CLASS 0x00000004 203 #define RES_PRF_CMD 0x00000008 204 #define RES_PRF_QUES 0x00000010 205 #define RES_PRF_ANS 0x00000020 206 #define RES_PRF_AUTH 0x00000040 207 #define RES_PRF_ADD 0x00000080 208 #define RES_PRF_HEAD1 0x00000100 209 #define RES_PRF_HEAD2 0x00000200 210 #define RES_PRF_TTLID 0x00000400 211 #define RES_PRF_HEADX 0x00000800 212 #define RES_PRF_QUERY 0x00001000 213 #define RES_PRF_REPLY 0x00002000 214 #define RES_PRF_INIT 0x00004000 215 /* 0x00008000 */ 216 217 /* hooks are still experimental as of 4.9.2 */ 218 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 219 res_sendhookact; 220 221 typedef res_sendhookact (*res_send_qhook)(struct sockaddr_in * const *ns, 222 const unsigned char **query, 223 int *querylen, 224 unsigned char *ans, 225 int anssiz, 226 int *resplen); 227 228 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr_in *ns, 229 const unsigned char *query, 230 int querylen, 231 unsigned char *ans, 232 int anssiz, 233 int *resplen); 234 235 struct res_sym { 236 int number; /* Identifying number, like T_MX */ 237 char * name; /* Its symbolic name, like "MX" */ 238 char * humanname; /* Its fun name, like "mail exchanger" */ 239 }; 240 241 extern struct __res_state _res; 242 #if 1 /* INET6 */ 243 extern struct __res_state_ext _res_ext; 244 #endif 245 extern const struct res_sym __p_class_syms[]; 246 extern const struct res_sym __p_type_syms[]; 247 248 /* Private routines shared between libc/net, named, nslookup and others. */ 249 #define res_hnok __res_hnok 250 #define res_ownok __res_ownok 251 #define res_mailok __res_mailok 252 #define res_dnok __res_dnok 253 #define sym_ston __sym_ston 254 #define sym_ntos __sym_ntos 255 #define sym_ntop __sym_ntop 256 #define b64_ntop __b64_ntop 257 #define b64_pton __b64_pton 258 #define loc_ntoa __loc_ntoa 259 #define loc_aton __loc_aton 260 #define dn_skipname __dn_skipname 261 #define fp_resstat __fp_resstat 262 #define fp_query __fp_query 263 #define fp_nquery __fp_nquery 264 #define hostalias __hostalias 265 #define putlong __putlong 266 #define putshort __putshort 267 #define p_class __p_class 268 #define p_time __p_time 269 #define p_type __p_type 270 #define p_query __p_query 271 #define p_cdnname __p_cdnname 272 #define p_cdname __p_cdname 273 #define p_fqnname __p_fqnname 274 #define p_fqname __p_fqname 275 #define p_rr __p_rr 276 #define p_option __p_option 277 #define p_secstodate __p_secstodate 278 #define dn_count_labels __dn_count_labels 279 #define dn_comp __dn_comp 280 #define res_randomid __res_randomid 281 #define res_send __res_send 282 #define res_isourserver __res_isourserver 283 #define res_nameinquery __res_nameinquery 284 #define res_queriesmatch __res_queriesmatch 285 #define res_close __res_close 286 #define res_opt __res_opt 287 288 #ifdef BIND_RES_POSIX3 289 #define dn_expand __dn_expand 290 #define res_init __res_init 291 #define res_query __res_query 292 #define res_search __res_search 293 #define res_querydomain __res_querydomain 294 #define res_mkquery __res_mkquery 295 #endif 296 297 __BEGIN_DECLS 298 int res_hnok(const char *); 299 int res_ownok(const char *); 300 int res_mailok(const char *); 301 int res_dnok(const char *); 302 int sym_ston(const struct res_sym *, char *, int *); 303 const char * sym_ntos(const struct res_sym *, int, int *); 304 const char * sym_ntop(const struct res_sym *, int, int *); 305 int b64_ntop(unsigned char const *, size_t, char *, size_t); 306 int b64_pton(char const *, unsigned char *, size_t); 307 int loc_aton(const char *, unsigned char *); 308 const char * loc_ntoa(const unsigned char *, char *); 309 int dn_skipname(const unsigned char *, 310 const unsigned char *); 311 void fp_resstat(struct __res_state *, FILE *); 312 void fp_query(const unsigned char *, FILE *); 313 void fp_nquery(const unsigned char *, int, FILE *); 314 const char * hostalias(const char *); 315 void putlong(u_int32_t, unsigned char *); 316 void putshort(u_int16_t, unsigned char *); 317 const char * p_class(int); 318 const char * p_time(u_int32_t); 319 const char * p_type(int); 320 void p_query(const unsigned char *); 321 const unsigned char * p_cdnname(const unsigned char *, const unsigned char *, 322 int, FILE *); 323 const unsigned char * p_cdname(const unsigned char *, const unsigned char *, 324 FILE *); 325 const unsigned char * p_fqnname(const unsigned char *, const unsigned char *, 326 int, char *, int); 327 const unsigned char * p_fqname(const unsigned char *, const unsigned char *, 328 FILE *); 329 const unsigned char * p_rr(const unsigned char *, const unsigned char *, 330 FILE *); 331 const char * p_option(unsigned long); 332 char * p_secstodate(unsigned long); 333 int dn_count_labels(char *); 334 int dn_comp(const char *, unsigned char *, int, 335 unsigned char **, unsigned char **); 336 int dn_expand(const unsigned char *, const unsigned char *, 337 const unsigned char *, char *, int); 338 int res_init(void); 339 int _res_init(int); 340 unsigned int res_randomid(void); 341 int res_query(const char *, int, int, unsigned char *, int) 342 __attribute__((__bounded__(__string__,4,5))); 343 int res_search(const char *, int, int, unsigned char *, int) 344 __attribute__((__bounded__(__string__,4,5))); 345 int res_querydomain(const char *, const char *, int, int, 346 unsigned char *, int) 347 __attribute__((__bounded__(__string__,5,6))); 348 int res_mkquery(int, const char *, int, int, 349 const unsigned char *, int, const unsigned char *, 350 unsigned char *, int) 351 __attribute__((__bounded__(__string__,5,6))) 352 __attribute__((__bounded__(__string__,8,9))); 353 int res_send(const unsigned char *, int, unsigned char *, 354 int) 355 __attribute__((__bounded__(__string__,3,4))); 356 int res_isourserver(const struct sockaddr_in *); 357 int res_nameinquery(const char *, int, int, 358 const unsigned char *, const unsigned char *); 359 int res_queriesmatch(const unsigned char *, 360 const unsigned char *, const unsigned char *, 361 const unsigned char *); 362 void res_close(void); 363 __END_DECLS 364 365 #endif /* !_RESOLV_H_ */ 366