1/* 2 * Copyright (c) 1995-1999 by Internet Software Consortium. 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 15 * SOFTWARE. 16 */ 17 18#if defined(LIBC_SCCS) && !defined(lint) 19static const char rcsid[] = "$Id: res_data.c,v 1.1 2006/03/01 19:01:37 majka Exp $"; 20#endif /* LIBC_SCCS and not lint */ 21 22#include <sys/types.h> 23#include <sys/param.h> 24#include <sys/socket.h> 25#include <sys/time.h> 26 27#include <netinet/in.h> 28#include <arpa/inet.h> 29#include <arpa/nameser.h> 30 31#include <ctype.h> 32#include <netdb.h> 33#include <resolv.h> 34#include <res_update.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <string.h> 38#include <unistd.h> 39 40#include "res_private.h" 41 42static struct __res_state *_res_static; 43 44#ifdef USE__RES_9 45struct __res_9_state _res_9; 46#endif 47 48extern int __res_vinit(res_state, int); 49 50const char *__res_opcodes[] = { 51 "QUERY", 52 "IQUERY", 53 "CQUERYM", 54 "CQUERYU", /* experimental */ 55 "NOTIFY", /* experimental */ 56 "UPDATE", 57 "6", 58 "7", 59 "8", 60 "9", 61 "10", 62 "11", 63 "12", 64 "13", 65 "ZONEINIT", 66 "ZONEREF", 67}; 68 69void 70__h_errno_set(struct __res_state *res, int err) 71{ 72 h_errno = res->res_h_errno = err; 73} 74 75void 76res_client_close(res_state res) 77{ 78 if (res == NULL) return; 79 80 if (res->_u._ext.ext != NULL) free(res->_u._ext.ext); 81 free(res); 82} 83 84res_state 85res_state_new() 86{ 87 res_state x; 88 89 x = (res_state)calloc(1, sizeof(struct __res_state)); 90 if (x == NULL) return NULL; 91 92 /* 93 * We use _pad (normally unused) to hold a version number. 94 * We use it provide limited compatibility between versions. 95 */ 96 x->_pad = 9; 97 98 x->_u._ext.ext = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_ext)); 99 if (x->_u._ext.ext == NULL) 100 { 101 free(x); 102 return NULL; 103 } 104 105 return x; 106} 107 108int 109res_init(void) 110{ 111 extern int __res_vinit(res_state, int); 112 unsigned int save_retrans, save_retry, save_options, save_id; 113 struct __res_state_ext *save_ext; 114 115#ifdef USE__RES_9 116 _res_static = &_res_9; 117#else 118 _res_static = &_res; 119#endif 120 121 save_retrans = RES_TIMEOUT; 122 save_retry = RES_DFLRETRY; 123 save_options = RES_DEFAULT; 124 save_id = res_randomid(); 125 save_ext = _res_static->_u._ext.ext; 126 127 if (_res_static->options & RES_INIT) 128 { 129 /* Caller wants to override default options */ 130 save_options = _res_static->options; 131 if (_res_static->retrans != 0) save_retrans = _res_static->retrans; 132 if (_res_static->retry != 0) save_retry = _res_static->retry; 133 if (_res_static->id != 0) save_id = _res_static->id; 134 } 135 136 memset(_res_static, 0, sizeof(struct __res_state)); 137 _res_static->_vcsock = -1; 138 139 _res_static->retrans = save_retrans; 140 _res_static->retry = save_retry; 141 _res_static->id = save_id; 142 _res_static->options = save_options; 143 _res_static->_u._ext.ext = save_ext; 144 145 _res_static->_pad = 9; 146 147 if (_res_static->_u._ext.ext == NULL) _res_static->_u._ext.ext = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_ext)); 148 149 return (__res_vinit(_res_static, 1)); 150} 151 152int 153res_query(const char *name, int class, int type, u_char *answer, int anslen) 154{ 155#ifdef USE__RES_9 156 _res_static = &_res_9; 157#else 158 _res_static = &_res; 159#endif 160 161 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) 162 { 163 RES_SET_H_ERRNO(_res_static, NETDB_INTERNAL); 164 return -1; 165 } 166 return (res_nquery(_res_static, name, class, type, answer, anslen)); 167} 168 169void 170fp_nquery(const u_char *msg, int len, FILE *file) 171{ 172#ifdef USE__RES_9 173 _res_static = &_res_9; 174#else 175 _res_static = &_res; 176#endif 177 178 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) return; 179 180 res_pquery(_res_static, msg, len, file); 181} 182 183void 184fp_query(const u_char *msg, FILE *file) 185{ 186 fp_nquery(msg, NS_PACKETSZ, file); 187} 188 189void 190p_query(const u_char *msg) 191{ 192 fp_query(msg, stdout); 193} 194 195const char * 196hostalias(const char *name) 197{ 198 static char abuf[NS_MAXDNAME]; 199 200#ifdef USE__RES_9 201 _res_static = &_res_9; 202#else 203 _res_static = &_res; 204#endif 205 206 return (res_hostalias(_res_static, name, abuf, sizeof abuf)); 207} 208 209void 210res_close(void) 211{ 212#ifdef USE__RES_9 213 _res_static = &_res_9; 214#else 215 _res_static = &_res; 216#endif 217 218 res_nclose(_res_static); 219} 220 221int 222res_isourserver(const struct sockaddr_in *inp) 223{ 224#ifdef USE__RES_9 225 _res_static = &_res_9; 226#else 227 _res_static = &_res; 228#endif 229 230 return (res_ourserver_p(_res_static, (const struct sockaddr *)inp)); 231} 232 233int 234res_nisourserver(const res_state res, const struct sockaddr_in *inp) 235{ 236 return (res_ourserver_p(res, (const struct sockaddr *)inp)); 237} 238 239int 240res_mkquery(int op, const char *dname, int class, int type, const u_char *data, int datalen, const u_char *newrr_in, u_char *buf, int buflen) 241{ 242#ifdef USE__RES_9 243 _res_static = &_res_9; 244#else 245 _res_static = &_res; 246#endif 247 248 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) 249 { 250 RES_SET_H_ERRNO(_res_static, NETDB_INTERNAL); 251 return -1; 252 } 253 254 return res_nmkquery(_res_static, op, dname, class, type, data, datalen, newrr_in, buf, buflen); 255} 256 257int 258res_querydomain(const char *name, const char *domain, int class, int type, u_char *answer, int anslen) 259{ 260#ifdef USE__RES_9 261 _res_static = &_res_9; 262#else 263 _res_static = &_res; 264#endif 265 266 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) 267 { 268 RES_SET_H_ERRNO(_res_static, NETDB_INTERNAL); 269 return -1; 270 } 271 272 return res_nquerydomain(_res_static, name, domain, class, type, answer, anslen); 273} 274 275int 276res_search(const char *name, int class, int type, u_char *answer, int anslen) 277{ 278#ifdef USE__RES_9 279 _res_static = &_res_9; 280#else 281 _res_static = &_res; 282#endif 283 284 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) 285 { 286 RES_SET_H_ERRNO(_res_static, NETDB_INTERNAL); 287 return -1; 288 } 289 290 return res_nsearch(_res_static, name, class, type, answer, anslen); 291} 292 293int 294res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) 295{ 296#ifdef USE__RES_9 297 _res_static = &_res_9; 298#else 299 _res_static = &_res; 300#endif 301 302 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) 303 { 304 /* errno should have been set by res_init() in this case. */ 305 return -1; 306 } 307 308 return res_nsend(_res_static, buf, buflen, ans, anssiz); 309} 310 311int 312res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, u_char *ans, int anssiz) 313{ 314#ifdef USE__RES_9 315 _res_static = &_res_9; 316#else 317 _res_static = &_res; 318#endif 319 320 if (((_res_static->options & RES_INIT) == 0) && (res_init() == -1)) 321 { 322 /* errno should have been set by res_init() in this case. */ 323 return -1; 324 } 325 326 return res_nsendsigned(_res_static, buf, buflen, key, ans, anssiz); 327} 328