1 /*- 2 * Copyright (c) 1983, 1987, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Portions Copyright (c) 1996 by Internet Software Consortium. 36 * 37 * Permission to use, copy, modify, and distribute this software for any 38 * purpose with or without fee is hereby granted, provided that the above 39 * copyright notice and this permission notice appear in all copies. 40 * 41 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 42 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 44 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 45 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 46 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 47 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 48 * SOFTWARE. 49 */ 50 51 /* 52 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 53 * From Id: resolv.h,v 8.12 1998/04/28 19:36:46 halley Exp $ 54 * $FreeBSD: src/include/resolv.h,v 1.19.2.1 2001/06/15 22:08:26 ume Exp $ 55 * $DragonFly: src/include/resolv.h,v 1.4 2004/02/26 13:58:25 joerg Exp $ 56 */ 57 58 #ifndef _RESOLV_H_ 59 #define _RESOLV_H_ 60 61 #include <sys/param.h> 62 #include <sys/types.h> 63 #include <sys/cdefs.h> 64 #include <sys/socket.h> 65 #include <stdio.h> 66 67 /* 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. 73 */ 74 75 #define __RES 19960801 76 77 /* 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. 81 */ 82 83 #ifndef _PATH_RESCONF 84 #define _PATH_RESCONF "/etc/resolv.conf" 85 #endif 86 87 /* 88 * Global defines and variables for resolver stub. 89 */ 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" */ 94 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 */ 98 99 struct __res_state { 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 */ 104 struct sockaddr_in 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[] */ 113 char unused[3]; 114 struct { 115 struct in_addr addr; 116 u_int32_t mask; 117 } sort_list[MAXRESOLVSORT]; 118 char pad[72]; /* on an i386 this means 512b total */ 119 }; 120 121 /* for INET6 */ 122 /* 123 * replacement of __res_state, separated to keep binary compatibility. 124 */ 125 struct __res_state_ext { 126 struct sockaddr_storage nsaddr_list[MAXNS]; 127 struct { 128 int af; /* address family for addr, mask */ 129 union { 130 struct in_addr ina; 131 struct in6_addr in6a; 132 } addr, mask; 133 } sort_list[MAXRESOLVSORT]; 134 }; 135 136 /* 137 * Resolver options (keep these in synch with res_debug.c, please) 138 */ 139 #define RES_INIT 0x00000001 /* address initialized */ 140 #define RES_DEBUG 0x00000002 /* print debug messages */ 141 #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 142 #define RES_USEVC 0x00000008 /* use virtual circuit */ 143 #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 144 #define RES_IGNTC 0x00000020 /* ignore truncation errors */ 145 #define RES_RECURSE 0x00000040 /* recursion desired */ 146 #define RES_DEFNAMES 0x00000080 /* use default domain name */ 147 #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 148 #define RES_DNSRCH 0x00000200 /* search up local domain tree */ 149 #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 150 #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 151 #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 152 #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 153 #define RES_NOTLDQUERY 0x00004000 /* Don't query TLD names */ 154 /* KAME extensions: use higher bit to avoid conflict with ISC use */ 155 #define RES_USE_EDNS0 0x40000000 /* use EDNS0 */ 156 157 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 158 159 /* 160 * Resolver "pfcode" values. Used by dig. 161 */ 162 #define RES_PRF_STATS 0x00000001 163 #define RES_PRF_UPDATE 0x00000002 164 #define RES_PRF_CLASS 0x00000004 165 #define RES_PRF_CMD 0x00000008 166 #define RES_PRF_QUES 0x00000010 167 #define RES_PRF_ANS 0x00000020 168 #define RES_PRF_AUTH 0x00000040 169 #define RES_PRF_ADD 0x00000080 170 #define RES_PRF_HEAD1 0x00000100 171 #define RES_PRF_HEAD2 0x00000200 172 #define RES_PRF_TTLID 0x00000400 173 #define RES_PRF_HEADX 0x00000800 174 #define RES_PRF_QUERY 0x00001000 175 #define RES_PRF_REPLY 0x00002000 176 #define RES_PRF_INIT 0x00004000 177 /* 0x00008000 */ 178 179 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 180 res_sendhookact; 181 182 typedef res_sendhookact (*res_send_qhook)(struct sockaddr_in * const *, 183 const u_char **, int *, 184 u_char *, int, int *); 185 186 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr_in *, 187 const u_char *, int, 188 u_char *, int, int *); 189 190 struct res_sym { 191 int number; /* Identifying number, like T_MX */ 192 char * name; /* Its symbolic name, like "MX" */ 193 char * humanname; /* Its fun name, like "mail exchanger" */ 194 }; 195 196 extern struct __res_state _res; 197 /* for INET6 */ 198 extern struct __res_state_ext _res_ext; 199 200 extern const struct res_sym __p_class_syms[]; 201 extern const struct res_sym __p_type_syms[]; 202 203 /* Private routines shared between libc/net, named, nslookup and others. */ 204 #define res_hnok __res_hnok 205 #define res_ownok __res_ownok 206 #define res_mailok __res_mailok 207 #define res_dnok __res_dnok 208 #define sym_ston __sym_ston 209 #define sym_ntos __sym_ntos 210 #define sym_ntop __sym_ntop 211 #define b64_ntop __b64_ntop 212 #define b64_pton __b64_pton 213 #define loc_ntoa __loc_ntoa 214 #define loc_aton __loc_aton 215 #define fp_resstat __fp_resstat 216 #define p_query __p_query 217 #define dn_skipname __dn_skipname 218 #define fp_resstat __fp_resstat 219 #define fp_query __fp_query 220 #define fp_nquery __fp_nquery 221 #define hostalias __hostalias 222 #define putlong __putlong 223 #define putshort __putshort 224 #define p_class __p_class 225 #define p_time __p_time 226 #define p_type __p_type 227 #define p_query __p_query 228 #define p_cdnname __p_cdnname 229 #define p_section __p_section 230 #define p_cdname __p_cdname 231 #define p_fqnname __p_fqnname 232 #define p_fqname __p_fqname 233 #define p_option __p_option 234 #define p_secstodate __p_secstodate 235 #define dn_count_labels __dn_count_labels 236 #define dn_comp __dn_comp 237 #define dn_expand __dn_expand 238 #define res_init __res_init 239 #define res_randomid __res_randomid 240 #define res_query __res_query 241 #define res_search __res_search 242 #define res_querydomain __res_querydomain 243 #define res_mkquery __res_mkquery 244 #define res_send __res_send 245 #define res_isourserver __res_isourserver 246 #define res_nameinquery __res_nameinquery 247 #define res_queriesmatch __res_queriesmatch 248 #define res_close __res_close 249 #define res_opt __res_opt 250 #define res_mkupdate __res_mkupdate 251 #define res_mkupdrec __res_mkupdrec 252 #define res_freeupdrec __res_freeupdrec 253 254 __BEGIN_DECLS 255 int res_hnok(const char *); 256 int res_ownok(const char *); 257 int res_mailok(const char *); 258 int res_dnok(const char *); 259 int sym_ston(const struct res_sym *, const char *, int *); 260 const char *sym_ntos(const struct res_sym *, int, int *); 261 const char *sym_ntop(const struct res_sym *, int, int *); 262 int b64_ntop(u_char const *, size_t, char *, size_t); 263 int b64_pton(char const *, u_char *, size_t); 264 int loc_aton(const char *, u_char *); 265 const char *loc_ntoa(const u_char *, char *); 266 int dn_skipname(const u_char *, const u_char *); 267 void fp_resstat(struct __res_state *, FILE *); 268 void fp_query(const u_char *, FILE *); 269 void fp_nquery(const u_char *, int, FILE *); 270 const char *hostalias(const char *); 271 void putlong(u_int32_t, u_char *); 272 void putshort(u_int16_t, u_char *); 273 const char *p_class(int); 274 const char *p_time(u_int32_t); 275 const char *p_type(int); 276 void p_query(const u_char *); 277 const u_char *p_cdnname(const u_char *, const u_char *, int, FILE *); 278 const u_char *p_cdname(const u_char *, const u_char *, FILE *); 279 const u_char *p_fqnname(const u_char *, const u_char *, 280 int, char *, int); 281 const u_char *p_fqname(const u_char *, const u_char *, FILE *); 282 const char *p_option(u_long); 283 char *p_secstodate(u_long); 284 int dn_count_labels(const char *); 285 int dn_comp(const char *, u_char *, int, 286 u_char **, u_char **); 287 int dn_expand(const u_char *, const u_char *, const u_char *, 288 char *, int); 289 int res_init(void); 290 u_int res_randomid(void); 291 int res_query(const char *, int, int, u_char *, int); 292 int res_search(const char *, int, int, u_char *, int); 293 int res_querydomain(const char *, const char *, int, int, 294 u_char *, int); 295 int res_mkquery(int, const char *, int, int, const u_char *, 296 int, const u_char *, u_char *, int); 297 int res_send(const u_char *, int, u_char *, int); 298 int res_isourserver(const struct sockaddr_in *); 299 int res_nameinquery(const char *, int, int, 300 const u_char *, const u_char *); 301 int res_queriesmatch(const u_char *, const u_char *, 302 const u_char *, const u_char *); 303 void res_close(void); 304 int res_opt(int, u_char *, int, int); 305 const char *p_section(int, int); 306 /* XXX The following depend on the ns_updrec typedef in arpa/nameser.h */ 307 #ifdef _ARPA_NAMESER_H_ 308 int res_update(ns_updrec *); 309 int res_mkupdate(ns_updrec *, u_char *, int); 310 ns_updrec *res_mkupdrec(int, const char *, u_int, u_int, u_long); 311 void res_freeupdrec(ns_updrec *); 312 #endif 313 __END_DECLS 314 315 #endif /* !_RESOLV_H_ */ 316