1/* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1995-1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#if defined(LIBC_SCCS) && !defined(lint) 19static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21 22#include "port_before.h" 23 24#include <sys/types.h> 25#include <sys/param.h> 26#include <sys/socket.h> 27#include <sys/time.h> 28 29#include <netinet/in.h> 30#include <arpa/inet.h> 31#include <arpa/nameser.h> 32 33#include <ctype.h> 34#include <netdb.h> 35#include <resolv.h> 36#include <res_update.h> 37#include <stdio.h> 38#include <stdlib.h> 39#include <string.h> 40#include <unistd.h> 41 42#include "port_after.h" 43 44const char *_res_opcodes[] = { 45 "QUERY", 46 "IQUERY", 47 "CQUERYM", 48 "CQUERYU", /*%< experimental */ 49 "NOTIFY", /*%< experimental */ 50 "UPDATE", 51 "6", 52 "7", 53 "8", 54 "9", 55 "10", 56 "11", 57 "12", 58 "13", 59 "ZONEINIT", 60 "ZONEREF", 61}; 62 63#ifdef BIND_UPDATE 64const char *_res_sectioncodes[] = { 65 "ZONE", 66 "PREREQUISITES", 67 "UPDATE", 68 "ADDITIONAL", 69}; 70#endif 71 72#undef _res 73#ifndef __BIND_NOSTATIC 74struct __res_state _res 75# if defined(__BIND_RES_TEXT) 76 = { RES_TIMEOUT, } /*%< Motorola, et al. */ 77# endif 78 ; 79 80#if defined(DO_PTHREADS) || defined(__linux) 81#define _res (*__res_state()) 82#endif 83 84/* Proto. */ 85 86int res_ourserver_p(const res_state, const struct sockaddr_in *); 87 88int 89res_init(void) { 90 extern int __res_vinit(res_state, int); 91 92 /* 93 * These three fields used to be statically initialized. This made 94 * it hard to use this code in a shared library. It is necessary, 95 * now that we're doing dynamic initialization here, that we preserve 96 * the old semantics: if an application modifies one of these three 97 * fields of _res before res_init() is called, res_init() will not 98 * alter them. Of course, if an application is setting them to 99 * _zero_ before calling res_init(), hoping to override what used 100 * to be the static default, we can't detect it and unexpected results 101 * will follow. Zero for any of these fields would make no sense, 102 * so one can safely assume that the applications were already getting 103 * unexpected results. 104 * 105 * _res.options is tricky since some apps were known to diddle the bits 106 * before res_init() was first called. We can't replicate that semantic 107 * with dynamic initialization (they may have turned bits off that are 108 * set in RES_DEFAULT). Our solution is to declare such applications 109 * "broken". They could fool us by setting RES_INIT but none do (yet). 110 */ 111 if (!_res.retrans) 112 _res.retrans = RES_TIMEOUT; 113 if (!_res.retry) 114 _res.retry = 4; 115 if (!(_res.options & RES_INIT)) 116 _res.options = RES_DEFAULT; 117 118 /* 119 * This one used to initialize implicitly to zero, so unless the app 120 * has set it to something in particular, we can randomize it now. 121 */ 122 if (!_res.id) 123 _res.id = res_nrandomid(&_res); 124 125 return (__res_vinit(&_res, 1)); 126} 127 128void 129p_query(const u_char *msg) { 130 fp_query(msg, stdout); 131} 132 133void 134fp_query(const u_char *msg, FILE *file) { 135 fp_nquery(msg, PACKETSZ, file); 136} 137 138void 139fp_nquery(const u_char *msg, int len, FILE *file) { 140 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 141 return; 142 143 res_pquery(&_res, msg, len, file); 144} 145 146int 147res_mkquery(int op, /*!< opcode of query */ 148 const char *dname, /*!< domain name */ 149 int class, int type, /*!< class and type of query */ 150 const u_char *data, /*!< resource record data */ 151 int datalen, /*!< length of data */ 152 const u_char *newrr_in, /*!< new rr for modify or append */ 153 u_char *buf, /*!< buffer to put query */ 154 int buflen) /*!< size of buffer */ 155{ 156 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 157 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 158 return (-1); 159 } 160 return (res_nmkquery(&_res, op, dname, class, type, 161 data, datalen, 162 newrr_in, buf, buflen)); 163} 164 165int 166res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 167 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 168 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 169 return (-1); 170 } 171 172 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 173} 174 175int 176res_query(const char *name, /*!< domain name */ 177 int class, int type, /*!< class and type of query */ 178 u_char *answer, /*!< buffer to put answer */ 179 int anslen) /*!< size of answer buffer */ 180{ 181 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 182 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 183 return (-1); 184 } 185 return (res_nquery(&_res, name, class, type, answer, anslen)); 186} 187 188void 189res_send_setqhook(res_send_qhook hook) { 190 _res.qhook = hook; 191} 192 193void 194res_send_setrhook(res_send_rhook hook) { 195 _res.rhook = hook; 196} 197 198int 199res_isourserver(const struct sockaddr_in *inp) { 200 return (res_ourserver_p(&_res, inp)); 201} 202 203int 204res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 205 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 206 /* errno should have been set by res_init() in this case. */ 207 return (-1); 208 } 209 210 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 211} 212 213int 214res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 215 u_char *ans, int anssiz) 216{ 217 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 218 /* errno should have been set by res_init() in this case. */ 219 return (-1); 220 } 221 222 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 223} 224 225void 226res_close(void) { 227 res_nclose(&_res); 228} 229 230int 231res_update(ns_updrec *rrecp_in) { 232 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 233 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 234 return (-1); 235 } 236 237 return (res_nupdate(&_res, rrecp_in, NULL)); 238} 239 240int 241res_search(const char *name, /*!< domain name */ 242 int class, int type, /*!< class and type of query */ 243 u_char *answer, /*!< buffer to put answer */ 244 int anslen) /*!< size of answer */ 245{ 246 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 247 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 248 return (-1); 249 } 250 251 return (res_nsearch(&_res, name, class, type, answer, anslen)); 252} 253 254int 255res_querydomain(const char *name, 256 const char *domain, 257 int class, int type, /*!< class and type of query */ 258 u_char *answer, /*!< buffer to put answer */ 259 int anslen) /*!< size of answer */ 260{ 261 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 262 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 263 return (-1); 264 } 265 266 return (res_nquerydomain(&_res, name, domain, 267 class, type, 268 answer, anslen)); 269} 270 271u_int 272res_randomid(void) { 273 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 274 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 275 return (-1); 276 } 277 278 return (res_nrandomid(&_res)); 279} 280 281const char * 282hostalias(const char *name) { 283 static char abuf[MAXDNAME]; 284 285 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 286} 287 288#ifdef ultrix 289int 290local_hostname_length(const char *hostname) { 291 int len_host, len_domain; 292 293 if (!*_res.defdname) 294 res_init(); 295 len_host = strlen(hostname); 296 len_domain = strlen(_res.defdname); 297 if (len_host > len_domain && 298 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 299 hostname[len_host - len_domain - 1] == '.') 300 return (len_host - len_domain - 1); 301 return (0); 302} 303#endif /*ultrix*/ 304 305#endif 306 307/*! \file */ 308