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 int 81 res_init(void) { 82 extern int __res_vinit(res_state, int); 83 84 /* 85 * These three fields used to be statically initialized. This made 86 * it hard to use this code in a shared library. It is necessary, 87 * now that we're doing dynamic initialization here, that we preserve 88 * the old semantics: if an application modifies one of these three 89 * fields of _res before res_init() is called, res_init() will not 90 * alter them. Of course, if an application is setting them to 91 * _zero_ before calling res_init(), hoping to override what used 92 * to be the static default, we can't detect it and unexpected results 93 * will follow. Zero for any of these fields would make no sense, 94 * so one can safely assume that the applications were already getting 95 * unexpected results. 96 * 97 * _res.options is tricky since some apps were known to diddle the bits 98 * before res_init() was first called. We can't replicate that semantic 99 * with dynamic initialization (they may have turned bits off that are 100 * set in RES_DEFAULT). Our solution is to declare such applications 101 * "broken". They could fool us by setting RES_INIT but none do (yet). 102 */ 103 if (!_res.retrans) 104 _res.retrans = RES_TIMEOUT; 105 if (!_res.retry) 106 _res.retry = RES_DFLRETRY; 107 if (!(_res.options & RES_INIT)) 108 _res.options = RES_DEFAULT; 109 110 return (__res_vinit(&_res, 1)); 111 } 112 113 void 114 p_query(const u_char *msg) { 115 fp_query(msg, stdout); 116 } 117 118 void 119 fp_query(const u_char *msg, FILE *file) { 120 fp_nquery(msg, PACKETSZ, file); 121 } 122 123 void 124 fp_nquery(const u_char *msg, int len, FILE *file) { 125 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 126 return; 127 128 res_pquery(&_res, msg, len, file); 129 } 130 131 int 132 res_mkquery(int op, /*!< opcode of query */ 133 const char *dname, /*!< domain name */ 134 int class, int type, /*!< class and type of query */ 135 const u_char *data, /*!< resource record data */ 136 int datalen, /*!< length of data */ 137 const u_char *newrr_in, /*!< new rr for modify or append */ 138 u_char *buf, /*!< buffer to put query */ 139 int buflen) /*!< size of buffer */ 140 { 141 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 142 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 143 return (-1); 144 } 145 return (res_nmkquery(&_res, op, dname, class, type, 146 data, datalen, 147 newrr_in, buf, buflen)); 148 } 149 150 int 151 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 152 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 153 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 154 return (-1); 155 } 156 157 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 158 } 159 160 int 161 res_query(const char *name, /*!< domain name */ 162 int class, int type, /*!< class and type of query */ 163 u_char *answer, /*!< buffer to put answer */ 164 int anslen) /*!< size of answer buffer */ 165 { 166 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 167 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 168 return (-1); 169 } 170 return (res_nquery(&_res, name, class, type, answer, anslen)); 171 } 172 173 #ifndef _LIBC 174 void 175 res_send_setqhook(res_send_qhook hook) { 176 _res.qhook = hook; 177 } 178 179 void 180 res_send_setrhook(res_send_rhook hook) { 181 _res.rhook = hook; 182 } 183 #endif 184 185 int 186 res_isourserver(const struct sockaddr_in *inp) { 187 return (res_ourserver_p(&_res, inp)); 188 } 189 190 int 191 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 192 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 193 /* errno should have been set by res_init() in this case. */ 194 return (-1); 195 } 196 197 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 198 } 199 200 #ifndef _LIBC 201 int 202 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 203 u_char *ans, int anssiz) 204 { 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_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 211 } 212 #endif 213 214 void 215 res_close(void) { 216 res_nclose(&_res); 217 } 218 219 int 220 res_update(ns_updrec *rrecp_in) { 221 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 222 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 223 return (-1); 224 } 225 226 return (res_nupdate(&_res, rrecp_in, NULL)); 227 } 228 229 int 230 res_search(const char *name, /*!< domain name */ 231 int class, int type, /*!< class and type of query */ 232 u_char *answer, /*!< buffer to put answer */ 233 int anslen) /*!< size of answer */ 234 { 235 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 236 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 237 return (-1); 238 } 239 240 return (res_nsearch(&_res, name, class, type, answer, anslen)); 241 } 242 243 int 244 res_querydomain(const char *name, 245 const char *domain, 246 int class, int type, /*!< class and type of query */ 247 u_char *answer, /*!< buffer to put answer */ 248 int anslen) /*!< size of answer */ 249 { 250 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 251 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 252 return (-1); 253 } 254 255 return (res_nquerydomain(&_res, name, domain, 256 class, type, 257 answer, anslen)); 258 } 259 260 u_int 261 res_randomid(void) { 262 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 263 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 264 return (-1); 265 } 266 267 return (res_nrandomid(&_res)); 268 } 269 270 int 271 res_opt(int n0, u_char *buf, int buflen, int anslen) 272 { 273 return (res_nopt(&_res, n0, buf, buflen, anslen)); 274 } 275 276 const char * 277 hostalias(const char *name) { 278 static char abuf[MAXDNAME]; 279 280 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 281 } 282 283 #ifdef ultrix 284 int 285 local_hostname_length(const char *hostname) { 286 int len_host, len_domain; 287 288 if (!*_res.defdname) 289 res_init(); 290 len_host = strlen(hostname); 291 len_domain = strlen(_res.defdname); 292 if (len_host > len_domain && 293 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 294 hostname[len_host - len_domain - 1] == '.') 295 return (len_host - len_domain - 1); 296 return (0); 297 } 298 #endif /*ultrix*/ 299 300 /* 301 * Weak aliases for applications that use certain private entry points, 302 * and fail to include <resolv.h>. 303 */ 304 #undef res_init 305 __weak_reference(__res_init, res_init); 306 #undef p_query 307 __weak_reference(__p_query, p_query); 308 #undef res_mkquery 309 __weak_reference(__res_mkquery, res_mkquery); 310 #undef res_query 311 __weak_reference(__res_query, res_query); 312 #undef res_send 313 __weak_reference(__res_send, res_send); 314 #undef res_close 315 __weak_reference(__res_close, _res_close); 316 #undef res_search 317 __weak_reference(__res_search, res_search); 318 #undef res_querydomain 319 __weak_reference(__res_querydomain, res_querydomain); 320 321 #endif 322 323 /*! \file */ 324