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) 19 static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $"; 20 #endif /* LIBC_SCCS and not lint */ 21 #include <sys/cdefs.h> 22 __FBSDID("$FreeBSD$"); 23 24 #include "port_before.h" 25 26 #include <sys/types.h> 27 #include <sys/param.h> 28 #include <sys/socket.h> 29 #include <sys/time.h> 30 31 #include <netinet/in.h> 32 #include <arpa/inet.h> 33 #include <arpa/nameser.h> 34 35 #include <ctype.h> 36 #include <netdb.h> 37 #include <resolv.h> 38 #include <res_update.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "port_after.h" 45 46 const char *_res_opcodes[] = { 47 "QUERY", 48 "IQUERY", 49 "CQUERYM", 50 "CQUERYU", /*%< experimental */ 51 "NOTIFY", /*%< experimental */ 52 "UPDATE", 53 "6", 54 "7", 55 "8", 56 "9", 57 "10", 58 "11", 59 "12", 60 "13", 61 "ZONEINIT", 62 "ZONEREF", 63 }; 64 65 #ifdef BIND_UPDATE 66 const char *_res_sectioncodes[] = { 67 "ZONE", 68 "PREREQUISITES", 69 "UPDATE", 70 "ADDITIONAL", 71 }; 72 #endif 73 74 #ifndef __BIND_NOSTATIC 75 76 /* Proto. */ 77 78 int res_ourserver_p(const res_state, const struct sockaddr_in *); 79 80 __noinline int 81 res_init(void) { 82 extern int __res_vinit(res_state, int); 83 res_state statp = &_res; 84 85 /* 86 * These three fields used to be statically initialized. This made 87 * it hard to use this code in a shared library. It is necessary, 88 * now that we're doing dynamic initialization here, that we preserve 89 * the old semantics: if an application modifies one of these three 90 * fields of _res before res_init() is called, res_init() will not 91 * alter them. Of course, if an application is setting them to 92 * _zero_ before calling res_init(), hoping to override what used 93 * to be the static default, we can't detect it and unexpected results 94 * will follow. Zero for any of these fields would make no sense, 95 * so one can safely assume that the applications were already getting 96 * unexpected results. 97 * 98 * _res.options is tricky since some apps were known to diddle the bits 99 * before res_init() was first called. We can't replicate that semantic 100 * with dynamic initialization (they may have turned bits off that are 101 * set in RES_DEFAULT). Our solution is to declare such applications 102 * "broken". They could fool us by setting RES_INIT but none do (yet). 103 */ 104 if (!statp->retrans) 105 statp->retrans = RES_TIMEOUT; 106 if (!statp->retry) 107 statp->retry = RES_DFLRETRY; 108 if (!(statp->options & RES_INIT)) 109 statp->options = RES_DEFAULT; 110 111 return (__res_vinit(statp, 1)); 112 } 113 114 void 115 p_query(const u_char *msg) { 116 fp_query(msg, stdout); 117 } 118 119 void 120 fp_query(const u_char *msg, FILE *file) { 121 fp_nquery(msg, PACKETSZ, file); 122 } 123 124 void 125 fp_nquery(const u_char *msg, int len, FILE *file) { 126 res_state statp = &_res; 127 if ((statp->options & RES_INIT) == 0U && res_init() == -1) 128 return; 129 130 res_pquery(statp, msg, len, file); 131 } 132 133 int 134 res_mkquery(int op, /*!< opcode of query */ 135 const char *dname, /*!< domain name */ 136 int class, int type, /*!< class and type of query */ 137 const u_char *data, /*!< resource record data */ 138 int datalen, /*!< length of data */ 139 const u_char *newrr_in, /*!< new rr for modify or append */ 140 u_char *buf, /*!< buffer to put query */ 141 int buflen) /*!< size of buffer */ 142 { 143 res_state statp = &_res; 144 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 145 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 146 return (-1); 147 } 148 return (res_nmkquery(statp, op, dname, class, type, 149 data, datalen, 150 newrr_in, buf, buflen)); 151 } 152 153 int 154 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 155 res_state statp = &_res; 156 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 157 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 158 return (-1); 159 } 160 161 return (res_nmkupdate(statp, rrecp_in, buf, buflen)); 162 } 163 164 int 165 res_query(const char *name, /*!< domain name */ 166 int class, int type, /*!< class and type of query */ 167 u_char *answer, /*!< buffer to put answer */ 168 int anslen) /*!< size of answer buffer */ 169 { 170 res_state statp = &_res; 171 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 172 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 173 return (-1); 174 } 175 return (res_nquery(statp, name, class, type, answer, anslen)); 176 } 177 178 #ifndef _LIBC 179 void 180 res_send_setqhook(res_send_qhook hook) { 181 _res.qhook = hook; 182 } 183 184 void 185 res_send_setrhook(res_send_rhook hook) { 186 _res.rhook = hook; 187 } 188 #endif 189 190 int 191 res_isourserver(const struct sockaddr_in *inp) { 192 return (res_ourserver_p(&_res, inp)); 193 } 194 195 int 196 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 197 res_state statp = &_res; 198 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 199 /* errno should have been set by res_init() in this case. */ 200 return (-1); 201 } 202 203 return (res_nsend(statp, buf, buflen, ans, anssiz)); 204 } 205 206 #ifndef _LIBC 207 int 208 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 209 u_char *ans, int anssiz) 210 { 211 res_state statp = &_res; 212 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 213 /* errno should have been set by res_init() in this case. */ 214 return (-1); 215 } 216 217 return (res_nsendsigned(statp, buf, buflen, key, ans, anssiz)); 218 } 219 #endif 220 221 void 222 res_close(void) { 223 res_nclose(&_res); 224 } 225 226 int 227 res_update(ns_updrec *rrecp_in) { 228 res_state statp = &_res; 229 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 230 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 231 return (-1); 232 } 233 234 return (res_nupdate(statp, rrecp_in, NULL)); 235 } 236 237 int 238 res_search(const char *name, /*!< domain name */ 239 int class, int type, /*!< class and type of query */ 240 u_char *answer, /*!< buffer to put answer */ 241 int anslen) /*!< size of answer */ 242 { 243 res_state statp = &_res; 244 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 245 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 246 return (-1); 247 } 248 249 return (res_nsearch(statp, name, class, type, answer, anslen)); 250 } 251 252 int 253 res_querydomain(const char *name, 254 const char *domain, 255 int class, int type, /*!< class and type of query */ 256 u_char *answer, /*!< buffer to put answer */ 257 int anslen) /*!< size of answer */ 258 { 259 res_state statp = &_res; 260 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 261 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 262 return (-1); 263 } 264 265 return (res_nquerydomain(statp, name, domain, 266 class, type, 267 answer, anslen)); 268 } 269 270 u_int 271 res_randomid(void) { 272 res_state statp = &_res; 273 if ((statp->options & RES_INIT) == 0U && res_init() == -1) { 274 RES_SET_H_ERRNO(statp, NETDB_INTERNAL); 275 return (-1); 276 } 277 278 return (res_nrandomid(statp)); 279 } 280 281 int 282 res_opt(int n0, u_char *buf, int buflen, int anslen) 283 { 284 return (res_nopt(&_res, n0, buf, buflen, anslen)); 285 } 286 287 const char * 288 hostalias(const char *name) { 289 static char abuf[MAXDNAME]; 290 291 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 292 } 293 294 #ifdef ultrix 295 int 296 local_hostname_length(const char *hostname) { 297 int len_host, len_domain; 298 res_state statp; 299 300 statp = &_res; 301 if (!*statp->defdname) 302 res_init(); 303 len_host = strlen(hostname); 304 len_domain = strlen(statp->defdname); 305 if (len_host > len_domain && 306 !strcasecmp(hostname + len_host - len_domain, statp->defdname) && 307 hostname[len_host - len_domain - 1] == '.') 308 return (len_host - len_domain - 1); 309 return (0); 310 } 311 #endif /*ultrix*/ 312 313 /* 314 * Weak aliases for applications that use certain private entry points, 315 * and fail to include <resolv.h>. 316 */ 317 #undef res_init 318 __weak_reference(__res_init, res_init); 319 #undef p_query 320 __weak_reference(__p_query, p_query); 321 #undef res_mkquery 322 __weak_reference(__res_mkquery, res_mkquery); 323 #undef res_query 324 __weak_reference(__res_query, res_query); 325 #undef res_send 326 __weak_reference(__res_send, res_send); 327 #undef res_close 328 __weak_reference(__res_close, _res_close); 329 #undef res_search 330 __weak_reference(__res_search, res_search); 331 #undef res_querydomain 332 __weak_reference(__res_querydomain, res_querydomain); 333 334 #endif 335 336 /*! \file */ 337