1 /* 2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 7 /* 8 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 9 * Copyright (c) 1995-1999 by Internet Software Consortium. 10 * 11 * Permission to use, copy, modify, and distribute this software for any 12 * purpose with or without fee is hereby granted, provided that the above 13 * copyright notice and this permission notice appear in all copies. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 16 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 17 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 18 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 20 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 21 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 22 */ 23 24 #if defined(LIBC_SCCS) && !defined(lint) 25 static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $"; 26 #endif /* LIBC_SCCS and not lint */ 27 28 #include "port_before.h" 29 30 #include <sys/types.h> 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 #include <sys/time.h> 34 35 #include <netinet/in.h> 36 #include <arpa/inet.h> 37 #include <arpa/nameser.h> 38 39 #include <ctype.h> 40 #include <netdb.h> 41 #include <resolv.h> 42 #include <res_update.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include "port_after.h" 49 50 #ifndef ORIGINAL_ISC_CODE 51 #pragma weak __fp_nquery = fp_nquery 52 #pragma weak __fp_query = fp_query 53 #pragma weak __p_query = p_query 54 #pragma weak __hostalias = hostalias 55 #pragma weak __res_randomid = res_randomid 56 #endif 57 58 const char *_res_opcodes[] = { 59 "QUERY", 60 "IQUERY", 61 "CQUERYM", 62 "CQUERYU", /*%< experimental */ 63 "NOTIFY", /*%< experimental */ 64 "UPDATE", 65 "6", 66 "7", 67 "8", 68 "9", 69 "10", 70 "11", 71 "12", 72 "13", 73 "ZONEINIT", 74 "ZONEREF", 75 }; 76 77 #ifdef BIND_UPDATE 78 const char *_res_sectioncodes[] = { 79 "ZONE", 80 "PREREQUISITES", 81 "UPDATE", 82 "ADDITIONAL", 83 }; 84 #endif 85 86 #undef _res 87 #ifndef __BIND_NOSTATIC 88 struct __res_state _res 89 # if defined(__BIND_RES_TEXT) 90 = { RES_TIMEOUT, } /*%< Motorola, et al. */ 91 # endif 92 ; 93 94 #if defined(DO_PTHREADS) || defined(__linux) 95 #define _res (*__res_state()) 96 #endif 97 98 /* Proto. */ 99 100 int res_ourserver_p(const res_state, const struct sockaddr_in *); 101 102 int 103 res_init(void) { 104 extern int __res_vinit(res_state, int); 105 106 /* 107 * These three fields used to be statically initialized. This made 108 * it hard to use this code in a shared library. It is necessary, 109 * now that we're doing dynamic initialization here, that we preserve 110 * the old semantics: if an application modifies one of these three 111 * fields of _res before res_init() is called, res_init() will not 112 * alter them. Of course, if an application is setting them to 113 * _zero_ before calling res_init(), hoping to override what used 114 * to be the static default, we can't detect it and unexpected results 115 * will follow. Zero for any of these fields would make no sense, 116 * so one can safely assume that the applications were already getting 117 * unexpected results. 118 * 119 * _res.options is tricky since some apps were known to diddle the bits 120 * before res_init() was first called. We can't replicate that semantic 121 * with dynamic initialization (they may have turned bits off that are 122 * set in RES_DEFAULT). Our solution is to declare such applications 123 * "broken". They could fool us by setting RES_INIT but none do (yet). 124 */ 125 if (!_res.retrans) 126 _res.retrans = RES_TIMEOUT; 127 if (!_res.retry) 128 _res.retry = 4; 129 if (!(_res.options & RES_INIT)) 130 _res.options = RES_DEFAULT; 131 132 /* 133 * This one used to initialize implicitly to zero, so unless the app 134 * has set it to something in particular, we can randomize it now. 135 */ 136 if (!_res.id) 137 _res.id = res_nrandomid(&_res); 138 139 return (__res_vinit(&_res, 1)); 140 } 141 142 void 143 p_query(const u_char *msg) { 144 fp_query(msg, stdout); 145 } 146 147 void 148 fp_query(const u_char *msg, FILE *file) { 149 fp_nquery(msg, PACKETSZ, file); 150 } 151 152 void 153 fp_nquery(const u_char *msg, int len, FILE *file) { 154 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 155 return; 156 157 res_pquery(&_res, msg, len, file); 158 } 159 160 int 161 res_mkquery(int op, /*!< opcode of query */ 162 const char *dname, /*!< domain name */ 163 int class, int type, /*!< class and type of query */ 164 const u_char *data, /*!< resource record data */ 165 int datalen, /*!< length of data */ 166 const u_char *newrr_in, /*!< new rr for modify or append */ 167 u_char *buf, /*!< buffer to put query */ 168 int buflen) /*!< size of buffer */ 169 { 170 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 171 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 172 return (-1); 173 } 174 return (res_nmkquery(&_res, op, dname, class, type, 175 data, datalen, 176 newrr_in, buf, buflen)); 177 } 178 179 int 180 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 181 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 182 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 183 return (-1); 184 } 185 186 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 187 } 188 189 int 190 res_query(const char *name, /*!< domain name */ 191 int class, int type, /*!< class and type of query */ 192 u_char *answer, /*!< buffer to put answer */ 193 int anslen) /*!< size of answer buffer */ 194 { 195 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 196 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 197 return (-1); 198 } 199 return (res_nquery(&_res, name, class, type, answer, anslen)); 200 } 201 202 void 203 res_send_setqhook(res_send_qhook hook) { 204 _res.qhook = hook; 205 } 206 207 void 208 res_send_setrhook(res_send_rhook hook) { 209 _res.rhook = hook; 210 } 211 212 int 213 res_isourserver(const struct sockaddr_in *inp) { 214 return (res_ourserver_p(&_res, inp)); 215 } 216 217 int 218 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 219 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 220 /* errno should have been set by res_init() in this case. */ 221 return (-1); 222 } 223 224 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 225 } 226 227 int 228 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 229 u_char *ans, int anssiz) 230 { 231 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 232 /* errno should have been set by res_init() in this case. */ 233 return (-1); 234 } 235 236 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 237 } 238 239 void 240 res_close(void) { 241 res_nclose(&_res); 242 } 243 244 int 245 res_update(ns_updrec *rrecp_in) { 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_nupdate(&_res, rrecp_in, NULL)); 252 } 253 254 int 255 res_search(const char *name, /*!< domain name */ 256 int class, int type, /*!< class and type of query */ 257 u_char *answer, /*!< buffer to put answer */ 258 int anslen) /*!< size of answer */ 259 { 260 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 261 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 262 return (-1); 263 } 264 265 return (res_nsearch(&_res, name, class, type, answer, anslen)); 266 } 267 268 int 269 res_querydomain(const char *name, 270 const char *domain, 271 int class, int type, /*!< class and type of query */ 272 u_char *answer, /*!< buffer to put answer */ 273 int anslen) /*!< size of answer */ 274 { 275 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 276 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 277 return (-1); 278 } 279 280 return (res_nquerydomain(&_res, name, domain, 281 class, type, 282 answer, anslen)); 283 } 284 285 u_int 286 res_randomid(void) { 287 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 288 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 289 return (-1); 290 } 291 292 return (res_nrandomid(&_res)); 293 } 294 295 const char * 296 hostalias(const char *name) { 297 static char abuf[MAXDNAME]; 298 299 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 300 } 301 302 #ifdef ultrix 303 int 304 local_hostname_length(const char *hostname) { 305 int len_host, len_domain; 306 307 if (!*_res.defdname) 308 res_init(); 309 len_host = strlen(hostname); 310 len_domain = strlen(_res.defdname); 311 if (len_host > len_domain && 312 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 313 hostname[len_host - len_domain - 1] == '.') 314 return (len_host - len_domain - 1); 315 return (0); 316 } 317 #endif /*ultrix*/ 318 319 #endif 320 321 /*! \file */ 322