resolv.h revision 93032
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: head/include/resolv.h 93032 2002-03-23 17:24:55Z imp $ 55 */ 56 57#ifndef _RESOLV_H_ 58#define _RESOLV_H_ 59 60#include <sys/param.h> 61#include <sys/types.h> 62#include <sys/cdefs.h> 63#include <sys/socket.h> 64#include <stdio.h> 65 66/* 67 * Revision information. This is the release date in YYYYMMDD format. 68 * It can change every day so the right thing to do with it is use it 69 * in preprocessor commands such as "#if (__RES > 19931104)". Do not 70 * compare for equality; rather, use it to determine whether your resolver 71 * is new enough to contain a certain feature. 72 */ 73 74#define __RES 19960801 75 76/* 77 * Resolver configuration file. 78 * Normally not present, but may contain the address of the 79 * inital name server(s) to query and the domain search list. 80 */ 81 82#ifndef _PATH_RESCONF 83#define _PATH_RESCONF "/etc/resolv.conf" 84#endif 85 86/* 87 * Global defines and variables for resolver stub. 88 */ 89#define MAXNS 3 /* max # name servers we'll track */ 90#define MAXDFLSRCH 3 /* # default domain levels to try */ 91#define MAXDNSRCH 6 /* max # domains in search path */ 92#define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 93 94#define RES_TIMEOUT 5 /* min. seconds between retries */ 95#define MAXRESOLVSORT 10 /* number of net to sort on */ 96#define RES_MAXNDOTS 15 /* should reflect bit field size */ 97 98struct __res_state { 99 int retrans; /* retransmition time interval */ 100 int retry; /* number of times to retransmit */ 101 u_long options; /* option flags - see below. */ 102 int nscount; /* number of name servers */ 103 struct sockaddr_in 104 nsaddr_list[MAXNS]; /* address of name server */ 105#define nsaddr nsaddr_list[0] /* for backward compatibility */ 106 u_short id; /* current message id */ 107 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 108 char defdname[256]; /* default domain (deprecated) */ 109 u_long pfcode; /* RES_PRF_ flags - see below. */ 110 unsigned ndots:4; /* threshold for initial abs. query */ 111 unsigned nsort:4; /* number of elements in sort_list[] */ 112 char unused[3]; 113 struct { 114 struct in_addr addr; 115 u_int32_t mask; 116 } sort_list[MAXRESOLVSORT]; 117 char pad[72]; /* on an i386 this means 512b total */ 118}; 119 120/* for INET6 */ 121/* 122 * replacement of __res_state, separated to keep binary compatibility. 123 */ 124struct __res_state_ext { 125 struct sockaddr_storage nsaddr_list[MAXNS]; 126 struct { 127 int af; /* address family for addr, mask */ 128 union { 129 struct in_addr ina; 130 struct in6_addr in6a; 131 } addr, mask; 132 } sort_list[MAXRESOLVSORT]; 133}; 134 135/* 136 * Resolver options (keep these in synch with res_debug.c, please) 137 */ 138#define RES_INIT 0x00000001 /* address initialized */ 139#define RES_DEBUG 0x00000002 /* print debug messages */ 140#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ 141#define RES_USEVC 0x00000008 /* use virtual circuit */ 142#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ 143#define RES_IGNTC 0x00000020 /* ignore truncation errors */ 144#define RES_RECURSE 0x00000040 /* recursion desired */ 145#define RES_DEFNAMES 0x00000080 /* use default domain name */ 146#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 147#define RES_DNSRCH 0x00000200 /* search up local domain tree */ 148#define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 149#define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 150#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ 151#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ 152#define RES_NOTLDQUERY 0x00004000 /* Don't query TLD names */ 153/* KAME extensions: use higher bit to avoid conflict with ISC use */ 154#define RES_USE_EDNS0 0x40000000 /* use EDNS0 */ 155 156#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 157 158/* 159 * Resolver "pfcode" values. Used by dig. 160 */ 161#define RES_PRF_STATS 0x00000001 162#define RES_PRF_UPDATE 0x00000002 163#define RES_PRF_CLASS 0x00000004 164#define RES_PRF_CMD 0x00000008 165#define RES_PRF_QUES 0x00000010 166#define RES_PRF_ANS 0x00000020 167#define RES_PRF_AUTH 0x00000040 168#define RES_PRF_ADD 0x00000080 169#define RES_PRF_HEAD1 0x00000100 170#define RES_PRF_HEAD2 0x00000200 171#define RES_PRF_TTLID 0x00000400 172#define RES_PRF_HEADX 0x00000800 173#define RES_PRF_QUERY 0x00001000 174#define RES_PRF_REPLY 0x00002000 175#define RES_PRF_INIT 0x00004000 176/* 0x00008000 */ 177 178typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 179 res_sendhookact; 180 181typedef res_sendhookact (*res_send_qhook)(struct sockaddr_in * const *ns, 182 const u_char **query, 183 int *querylen, 184 u_char *ans, 185 int anssiz, 186 int *resplen); 187 188typedef res_sendhookact (*res_send_rhook)(const struct sockaddr_in *ns, 189 const u_char *query, 190 int querylen, 191 u_char *ans, 192 int anssiz, 193 int *resplen); 194 195struct res_sym { 196 int number; /* Identifying number, like T_MX */ 197 char * name; /* Its symbolic name, like "MX" */ 198 char * humanname; /* Its fun name, like "mail exchanger" */ 199}; 200 201extern struct __res_state _res; 202/* for INET6 */ 203extern struct __res_state_ext _res_ext; 204 205extern const struct res_sym __p_class_syms[]; 206extern const struct res_sym __p_type_syms[]; 207 208/* Private routines shared between libc/net, named, nslookup and others. */ 209#define res_hnok __res_hnok 210#define res_ownok __res_ownok 211#define res_mailok __res_mailok 212#define res_dnok __res_dnok 213#define sym_ston __sym_ston 214#define sym_ntos __sym_ntos 215#define sym_ntop __sym_ntop 216#define b64_ntop __b64_ntop 217#define b64_pton __b64_pton 218#define loc_ntoa __loc_ntoa 219#define loc_aton __loc_aton 220#define fp_resstat __fp_resstat 221#define p_query __p_query 222#define dn_skipname __dn_skipname 223#define fp_resstat __fp_resstat 224#define fp_query __fp_query 225#define fp_nquery __fp_nquery 226#define hostalias __hostalias 227#define putlong __putlong 228#define putshort __putshort 229#define p_class __p_class 230#define p_time __p_time 231#define p_type __p_type 232#define p_query __p_query 233#define p_cdnname __p_cdnname 234#define p_section __p_section 235#define p_cdname __p_cdname 236#define p_fqnname __p_fqnname 237#define p_fqname __p_fqname 238#define p_option __p_option 239#define p_secstodate __p_secstodate 240#define dn_count_labels __dn_count_labels 241#define dn_comp __dn_comp 242#define dn_expand __dn_expand 243#define res_init __res_init 244#define res_randomid __res_randomid 245#define res_query __res_query 246#define res_search __res_search 247#define res_querydomain __res_querydomain 248#define res_mkquery __res_mkquery 249#define res_send __res_send 250#define res_isourserver __res_isourserver 251#define res_nameinquery __res_nameinquery 252#define res_queriesmatch __res_queriesmatch 253#define res_close __res_close 254#define res_opt __res_opt 255#define res_mkupdate __res_mkupdate 256#define res_mkupdrec __res_mkupdrec 257#define res_freeupdrec __res_freeupdrec 258 259__BEGIN_DECLS 260int res_hnok(const char *); 261int res_ownok(const char *); 262int res_mailok(const char *); 263int res_dnok(const char *); 264int sym_ston(const struct res_sym *, const char *, int *); 265const char * sym_ntos(const struct res_sym *, int, int *); 266const char * sym_ntop(const struct res_sym *, int, int *); 267int b64_ntop(u_char const *, size_t, char *, size_t); 268int b64_pton(char const *, u_char *, size_t); 269int loc_aton(const char *, u_char *); 270const char * loc_ntoa(const u_char *, char *); 271int dn_skipname(const u_char *, const u_char *); 272void fp_resstat(struct __res_state *, FILE *); 273void fp_query(const u_char *, FILE *); 274void fp_nquery(const u_char *, int, FILE *); 275const char * hostalias(const char *); 276void putlong(u_int32_t, u_char *); 277void putshort(u_int16_t, u_char *); 278const char * p_class(int); 279const char * p_time(u_int32_t); 280const char * p_type(int); 281void p_query(const u_char *); 282const u_char * p_cdnname(const u_char *, const u_char *, int, FILE *); 283const u_char * p_cdname(const u_char *, const u_char *, FILE *); 284const u_char * p_fqnname(const u_char *, const u_char *, 285 int, char *, int); 286const u_char * p_fqname(const u_char *, const u_char *, FILE *); 287const char * p_option(u_long); 288char * p_secstodate(u_long); 289int dn_count_labels(const char *); 290int dn_comp(const char *, u_char *, int, u_char **, u_char **); 291int dn_expand(const u_char *, const u_char *, const u_char *, 292 char *, int); 293int res_init(void); 294u_int res_randomid(void); 295int res_query(const char *, int, int, u_char *, int); 296int res_search(const char *, int, int, u_char *, int); 297int res_querydomain(const char *, const char *, int, int, 298 u_char *, int); 299int res_mkquery(int, const char *, int, int, const u_char *, 300 int, const u_char *, u_char *, int); 301int res_send(const u_char *, int, u_char *, int); 302int res_isourserver(const struct sockaddr_in *); 303int res_nameinquery(const char *, int, int, 304 const u_char *, const u_char *); 305int res_queriesmatch(const u_char *, const u_char *, 306 const u_char *, const u_char *); 307void res_close(void); 308int res_opt(int, u_char *, int, int); 309const char * p_section(int, int); 310/* XXX The following depend on the ns_updrec typedef in arpa/nameser.h */ 311#ifdef _ARPA_NAMESER_H_ 312int res_update(ns_updrec *); 313int res_mkupdate(ns_updrec *, u_char *, int); 314ns_updrec * res_mkupdrec(int, const char *, u_int, u_int, u_long); 315void res_freeupdrec(ns_updrec *); 316#endif 317__END_DECLS 318 319#endif /* !_RESOLV_H_ */ 320