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 #include "port_before.h" 24 25 #include <sys/types.h> 26 #include <sys/param.h> 27 #include <sys/socket.h> 28 #include <sys/time.h> 29 30 #include <netinet/in.h> 31 #include <arpa/inet.h> 32 #include <arpa/nameser.h> 33 34 #include <ctype.h> 35 #include <netdb.h> 36 #include <resolv.h> 37 #include <res_update.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "port_after.h" 44 45 #ifndef ORIGINAL_ISC_CODE 46 #pragma weak __fp_nquery = fp_nquery 47 #pragma weak __fp_query = fp_query 48 #pragma weak __p_query = p_query 49 #pragma weak __hostalias = hostalias 50 #pragma weak __res_randomid = res_randomid 51 #endif 52 53 const char *_res_opcodes[] = { 54 "QUERY", 55 "IQUERY", 56 "CQUERYM", 57 "CQUERYU", /*%< experimental */ 58 "NOTIFY", /*%< experimental */ 59 "UPDATE", 60 "6", 61 "7", 62 "8", 63 "9", 64 "10", 65 "11", 66 "12", 67 "13", 68 "ZONEINIT", 69 "ZONEREF", 70 }; 71 72 #ifdef BIND_UPDATE 73 const char *_res_sectioncodes[] = { 74 "ZONE", 75 "PREREQUISITES", 76 "UPDATE", 77 "ADDITIONAL", 78 }; 79 #endif 80 81 #undef _res 82 #ifndef __BIND_NOSTATIC 83 struct __res_state _res 84 # if defined(__BIND_RES_TEXT) 85 = { RES_TIMEOUT, } /*%< Motorola, et al. */ 86 # endif 87 ; 88 89 #ifdef ORIGINAL_ISC_CODE 90 #if defined(DO_PTHREADS) || defined(__linux) 91 #define _res (*__res_state()) 92 #endif 93 #endif 94 95 /* Proto. */ 96 97 int res_ourserver_p(const res_state, const struct sockaddr_in *); 98 99 int 100 res_init(void) { 101 extern int __res_vinit(res_state, int); 102 103 /* 104 * These three fields used to be statically initialized. This made 105 * it hard to use this code in a shared library. It is necessary, 106 * now that we're doing dynamic initialization here, that we preserve 107 * the old semantics: if an application modifies one of these three 108 * fields of _res before res_init() is called, res_init() will not 109 * alter them. Of course, if an application is setting them to 110 * _zero_ before calling res_init(), hoping to override what used 111 * to be the static default, we can't detect it and unexpected results 112 * will follow. Zero for any of these fields would make no sense, 113 * so one can safely assume that the applications were already getting 114 * unexpected results. 115 * 116 * _res.options is tricky since some apps were known to diddle the bits 117 * before res_init() was first called. We can't replicate that semantic 118 * with dynamic initialization (they may have turned bits off that are 119 * set in RES_DEFAULT). Our solution is to declare such applications 120 * "broken". They could fool us by setting RES_INIT but none do (yet). 121 */ 122 if (!_res.retrans) 123 _res.retrans = RES_TIMEOUT; 124 if (!_res.retry) 125 _res.retry = 4; 126 if (!(_res.options & RES_INIT)) 127 _res.options = RES_DEFAULT; 128 129 /* 130 * This one used to initialize implicitly to zero, so unless the app 131 * has set it to something in particular, we can randomize it now. 132 */ 133 if (!_res.id) 134 _res.id = res_nrandomid(&_res); 135 136 return (__res_vinit(&_res, 1)); 137 } 138 139 void 140 p_query(const u_char *msg) { 141 fp_query(msg, stdout); 142 } 143 144 void 145 fp_query(const u_char *msg, FILE *file) { 146 fp_nquery(msg, PACKETSZ, file); 147 } 148 149 void 150 fp_nquery(const u_char *msg, int len, FILE *file) { 151 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 152 return; 153 154 res_pquery(&_res, msg, len, file); 155 } 156 157 int 158 res_mkquery(int op, /*!< opcode of query */ 159 const char *dname, /*!< domain name */ 160 int class, int type, /*!< class and type of query */ 161 const u_char *data, /*!< resource record data */ 162 int datalen, /*!< length of data */ 163 const u_char *newrr_in, /*!< new rr for modify or append */ 164 u_char *buf, /*!< buffer to put query */ 165 int buflen) /*!< size of buffer */ 166 { 167 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 168 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 169 return (-1); 170 } 171 return (res_nmkquery(&_res, op, dname, class, type, 172 data, datalen, 173 newrr_in, buf, buflen)); 174 } 175 176 int 177 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 178 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 179 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 180 return (-1); 181 } 182 183 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 184 } 185 186 int 187 res_query(const char *name, /*!< domain name */ 188 int class, int type, /*!< class and type of query */ 189 u_char *answer, /*!< buffer to put answer */ 190 int anslen) /*!< size of answer buffer */ 191 { 192 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 193 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 194 return (-1); 195 } 196 return (res_nquery(&_res, name, class, type, answer, anslen)); 197 } 198 199 void 200 res_send_setqhook(res_send_qhook hook) { 201 _res.qhook = hook; 202 } 203 204 void 205 res_send_setrhook(res_send_rhook hook) { 206 _res.rhook = hook; 207 } 208 209 int 210 res_isourserver(const struct sockaddr_in *inp) { 211 return (res_ourserver_p(&_res, inp)); 212 } 213 214 int 215 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 216 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 217 /* errno should have been set by res_init() in this case. */ 218 return (-1); 219 } 220 221 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 222 } 223 224 int 225 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 226 u_char *ans, int anssiz) 227 { 228 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 229 /* errno should have been set by res_init() in this case. */ 230 return (-1); 231 } 232 233 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 234 } 235 236 void 237 res_close(void) { 238 res_nclose(&_res); 239 } 240 241 int 242 res_update(ns_updrec *rrecp_in) { 243 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 244 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 245 return (-1); 246 } 247 248 return (res_nupdate(&_res, rrecp_in, NULL)); 249 } 250 251 int 252 res_search(const char *name, /*!< domain name */ 253 int class, int type, /*!< class and type of query */ 254 u_char *answer, /*!< buffer to put answer */ 255 int anslen) /*!< size of answer */ 256 { 257 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 258 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 259 return (-1); 260 } 261 262 return (res_nsearch(&_res, name, class, type, answer, anslen)); 263 } 264 265 int 266 res_querydomain(const char *name, 267 const char *domain, 268 int class, int type, /*!< class and type of query */ 269 u_char *answer, /*!< buffer to put answer */ 270 int anslen) /*!< size of answer */ 271 { 272 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 273 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 274 return (-1); 275 } 276 277 return (res_nquerydomain(&_res, name, domain, 278 class, type, 279 answer, anslen)); 280 } 281 282 u_int 283 res_randomid(void) { 284 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 285 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 286 return (-1); 287 } 288 289 return (res_nrandomid(&_res)); 290 } 291 292 const char * 293 hostalias(const char *name) { 294 static char abuf[MAXDNAME]; 295 296 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 297 } 298 299 #ifdef ultrix 300 int 301 local_hostname_length(const char *hostname) { 302 int len_host, len_domain; 303 304 if (!*_res.defdname) 305 res_init(); 306 len_host = strlen(hostname); 307 len_domain = strlen(_res.defdname); 308 if (len_host > len_domain && 309 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 310 hostname[len_host - len_domain - 1] == '.') 311 return (len_host - len_domain - 1); 312 return (0); 313 } 314 #endif /*ultrix*/ 315 316 #endif 317 318 /*! \file */ 319