1 /* 2 * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved. 3 */ 4 5 6 /* 7 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 8 * Copyright (c) 1995-1999 by Internet Software Consortium. 9 * 10 * Permission to use, copy, modify, and distribute this software for any 11 * purpose with or without fee is hereby granted, provided that the above 12 * copyright notice and this permission notice appear in all copies. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 15 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 16 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 17 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 19 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 20 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 21 */ 22 23 #if defined(LIBC_SCCS) && !defined(lint) 24 static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $"; 25 #endif /* LIBC_SCCS and not lint */ 26 27 #include "port_before.h" 28 29 #include <sys/types.h> 30 #include <sys/param.h> 31 #include <sys/socket.h> 32 #include <sys/time.h> 33 34 #include <netinet/in.h> 35 #include <arpa/inet.h> 36 #include <arpa/nameser.h> 37 38 #include <ctype.h> 39 #include <netdb.h> 40 #include <resolv.h> 41 #include <res_update.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "port_after.h" 48 49 #ifndef ORIGINAL_ISC_CODE 50 #pragma weak __fp_nquery = fp_nquery 51 #pragma weak __fp_query = fp_query 52 #pragma weak __p_query = p_query 53 #pragma weak __hostalias = hostalias 54 #pragma weak __res_randomid = res_randomid 55 #endif 56 57 const char *_res_opcodes[] = { 58 "QUERY", 59 "IQUERY", 60 "CQUERYM", 61 "CQUERYU", /*%< experimental */ 62 "NOTIFY", /*%< experimental */ 63 "UPDATE", 64 "6", 65 "7", 66 "8", 67 "9", 68 "10", 69 "11", 70 "12", 71 "13", 72 "ZONEINIT", 73 "ZONEREF", 74 }; 75 76 #ifdef BIND_UPDATE 77 const char *_res_sectioncodes[] = { 78 "ZONE", 79 "PREREQUISITES", 80 "UPDATE", 81 "ADDITIONAL", 82 }; 83 #endif 84 85 #undef _res 86 #ifndef __BIND_NOSTATIC 87 struct __res_state _res 88 # if defined(__BIND_RES_TEXT) 89 = { RES_TIMEOUT, } /*%< Motorola, et al. */ 90 # endif 91 ; 92 93 #ifdef ORIGINAL_ISC_CODE 94 #if defined(DO_PTHREADS) || defined(__linux) 95 #define _res (*__res_state()) 96 #endif 97 #endif 98 99 /* Proto. */ 100 101 int res_ourserver_p(const res_state, const struct sockaddr_in *); 102 103 int 104 res_init(void) { 105 extern int __res_vinit(res_state, int); 106 107 /* 108 * These three fields used to be statically initialized. This made 109 * it hard to use this code in a shared library. It is necessary, 110 * now that we're doing dynamic initialization here, that we preserve 111 * the old semantics: if an application modifies one of these three 112 * fields of _res before res_init() is called, res_init() will not 113 * alter them. Of course, if an application is setting them to 114 * _zero_ before calling res_init(), hoping to override what used 115 * to be the static default, we can't detect it and unexpected results 116 * will follow. Zero for any of these fields would make no sense, 117 * so one can safely assume that the applications were already getting 118 * unexpected results. 119 * 120 * _res.options is tricky since some apps were known to diddle the bits 121 * before res_init() was first called. We can't replicate that semantic 122 * with dynamic initialization (they may have turned bits off that are 123 * set in RES_DEFAULT). Our solution is to declare such applications 124 * "broken". They could fool us by setting RES_INIT but none do (yet). 125 */ 126 if (!_res.retrans) 127 _res.retrans = RES_TIMEOUT; 128 if (!_res.retry) 129 _res.retry = 4; 130 if (!(_res.options & RES_INIT)) 131 _res.options = RES_DEFAULT; 132 133 /* 134 * This one used to initialize implicitly to zero, so unless the app 135 * has set it to something in particular, we can randomize it now. 136 */ 137 if (!_res.id) 138 _res.id = res_nrandomid(&_res); 139 140 return (__res_vinit(&_res, 1)); 141 } 142 143 void 144 p_query(const u_char *msg) { 145 fp_query(msg, stdout); 146 } 147 148 void 149 fp_query(const u_char *msg, FILE *file) { 150 fp_nquery(msg, PACKETSZ, file); 151 } 152 153 void 154 fp_nquery(const u_char *msg, int len, FILE *file) { 155 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 156 return; 157 158 res_pquery(&_res, msg, len, file); 159 } 160 161 int 162 res_mkquery(int op, /*!< opcode of query */ 163 const char *dname, /*!< domain name */ 164 int class, int type, /*!< class and type of query */ 165 const u_char *data, /*!< resource record data */ 166 int datalen, /*!< length of data */ 167 const u_char *newrr_in, /*!< new rr for modify or append */ 168 u_char *buf, /*!< buffer to put query */ 169 int buflen) /*!< size of buffer */ 170 { 171 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 172 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 173 return (-1); 174 } 175 return (res_nmkquery(&_res, op, dname, class, type, 176 data, datalen, 177 newrr_in, buf, buflen)); 178 } 179 180 int 181 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 182 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 183 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 184 return (-1); 185 } 186 187 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 188 } 189 190 int 191 res_query(const char *name, /*!< domain name */ 192 int class, int type, /*!< class and type of query */ 193 u_char *answer, /*!< buffer to put answer */ 194 int anslen) /*!< size of answer buffer */ 195 { 196 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 197 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 198 return (-1); 199 } 200 return (res_nquery(&_res, name, class, type, answer, anslen)); 201 } 202 203 void 204 res_send_setqhook(res_send_qhook hook) { 205 _res.qhook = hook; 206 } 207 208 void 209 res_send_setrhook(res_send_rhook hook) { 210 _res.rhook = hook; 211 } 212 213 int 214 res_isourserver(const struct sockaddr_in *inp) { 215 return (res_ourserver_p(&_res, inp)); 216 } 217 218 int 219 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 220 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 221 /* errno should have been set by res_init() in this case. */ 222 return (-1); 223 } 224 225 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 226 } 227 228 int 229 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 230 u_char *ans, int anssiz) 231 { 232 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 233 /* errno should have been set by res_init() in this case. */ 234 return (-1); 235 } 236 237 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 238 } 239 240 void 241 res_close(void) { 242 res_nclose(&_res); 243 } 244 245 int 246 res_update(ns_updrec *rrecp_in) { 247 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 248 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 249 return (-1); 250 } 251 252 return (res_nupdate(&_res, rrecp_in, NULL)); 253 } 254 255 int 256 res_search(const char *name, /*!< domain name */ 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_nsearch(&_res, name, class, type, answer, anslen)); 267 } 268 269 int 270 res_querydomain(const char *name, 271 const char *domain, 272 int class, int type, /*!< class and type of query */ 273 u_char *answer, /*!< buffer to put answer */ 274 int anslen) /*!< size of answer */ 275 { 276 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 277 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 278 return (-1); 279 } 280 281 return (res_nquerydomain(&_res, name, domain, 282 class, type, 283 answer, anslen)); 284 } 285 286 u_int 287 res_randomid(void) { 288 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 289 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 290 return (-1); 291 } 292 293 return (res_nrandomid(&_res)); 294 } 295 296 const char * 297 hostalias(const char *name) { 298 static char abuf[MAXDNAME]; 299 300 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 301 } 302 303 #ifdef ultrix 304 int 305 local_hostname_length(const char *hostname) { 306 int len_host, len_domain; 307 308 if (!*_res.defdname) 309 res_init(); 310 len_host = strlen(hostname); 311 len_domain = strlen(_res.defdname); 312 if (len_host > len_domain && 313 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 314 hostname[len_host - len_domain - 1] == '.') 315 return (len_host - len_domain - 1); 316 return (0); 317 } 318 #endif /*ultrix*/ 319 320 #endif 321 322 /*! \file */ 323