res_data.c revision 1.5
1 /* $NetBSD: res_data.c,v 1.5 2004/05/21 15:35:05 christos Exp $ */ 2 3 /* 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1995-1999 by Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/cdefs.h> 21 #if defined(LIBC_SCCS) && !defined(lint) 22 #ifdef notdef 23 static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp"; 24 #else 25 __RCSID("$NetBSD: res_data.c,v 1.5 2004/05/21 15:35:05 christos Exp $"); 26 #endif 27 #endif /* LIBC_SCCS and not lint */ 28 29 #include "port_before.h" 30 31 #include "namespace.h" 32 #include <sys/types.h> 33 #include <sys/param.h> 34 #include <sys/socket.h> 35 #include <sys/time.h> 36 37 #include <netinet/in.h> 38 #include <arpa/inet.h> 39 #include <arpa/nameser.h> 40 41 #include <ctype.h> 42 #include <netdb.h> 43 #include <resolv.h> 44 #include <res_update.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "port_after.h" 51 52 #ifdef __weak_alias 53 __weak_alias(res_init,_res_init) 54 __weak_alias(res_mkquery,_res_mkquery) 55 __weak_alias(res_send_setqhook,__res_send_setqhook) 56 __weak_alias(res_send_setrhook,__res_send_setrhook) 57 __weak_alias(res_isourserver,__res_isourserver) 58 __weak_alias(res_send,__res_send) 59 __weak_alias(res_close,__res_close) 60 __weak_alias(res_search,_res_search) 61 __weak_alias(res_querydomain,__res_querydomain) 62 __weak_alias(res_opt,_res_opt) 63 __weak_alias(hostalias,__hostalias) 64 #endif 65 66 #undef _res 67 68 const char *_res_opcodes[] = { 69 "QUERY", 70 "IQUERY", 71 "CQUERYM", 72 "CQUERYU", /* experimental */ 73 "NOTIFY", /* experimental */ 74 "UPDATE", 75 "6", 76 "7", 77 "8", 78 "9", 79 "10", 80 "11", 81 "12", 82 "13", 83 "ZONEINIT", 84 "ZONEREF", 85 }; 86 87 #ifdef BIND_UPDATE 88 const char *_res_sectioncodes[] = { 89 "ZONE", 90 "PREREQUISITES", 91 "UPDATE", 92 "ADDITIONAL", 93 }; 94 #endif 95 96 #ifndef __BIND_NOSTATIC 97 struct __res_state _res 98 # if defined(__BIND_RES_TEXT) 99 = { RES_TIMEOUT, } /* Motorola, et al. */ 100 # endif 101 ; 102 103 /* Proto. */ 104 105 int res_ourserver_p(const res_state, const struct sockaddr *); 106 107 int 108 res_init(void) { 109 extern int __res_vinit(res_state, int); 110 111 /* 112 * These three fields used to be statically initialized. This made 113 * it hard to use this code in a shared library. It is necessary, 114 * now that we're doing dynamic initialization here, that we preserve 115 * the old semantics: if an application modifies one of these three 116 * fields of _res before res_init() is called, res_init() will not 117 * alter them. Of course, if an application is setting them to 118 * _zero_ before calling res_init(), hoping to override what used 119 * to be the static default, we can't detect it and unexpected results 120 * will follow. Zero for any of these fields would make no sense, 121 * so one can safely assume that the applications were already getting 122 * unexpected results. 123 * 124 * _res.options is tricky since some apps were known to diddle the bits 125 * before res_init() was first called. We can't replicate that semantic 126 * with dynamic initialization (they may have turned bits off that are 127 * set in RES_DEFAULT). Our solution is to declare such applications 128 * "broken". They could fool us by setting RES_INIT but none do (yet). 129 */ 130 if (!_res.retrans) 131 _res.retrans = RES_TIMEOUT; 132 if (!_res.retry) 133 _res.retry = 4; 134 if (!(_res.options & RES_INIT)) 135 _res.options = RES_DEFAULT; 136 137 /* 138 * This one used to initialize implicitly to zero, so unless the app 139 * has set it to something in particular, we can randomize it now. 140 */ 141 if (!_res.id) 142 _res.id = res_randomid(); 143 144 return (__res_vinit(&_res, 1)); 145 } 146 147 void 148 p_query(const u_char *msg) { 149 fp_query(msg, stdout); 150 } 151 152 void 153 fp_query(const u_char *msg, FILE *file) { 154 fp_nquery(msg, PACKETSZ, file); 155 } 156 157 void 158 fp_nquery(const u_char *msg, int len, FILE *file) { 159 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 160 return; 161 162 res_pquery(&_res, msg, len, file); 163 } 164 165 int 166 res_mkquery(int op, /* opcode of query */ 167 const char *dname, /* domain name */ 168 int class, int type, /* class and type of query */ 169 const u_char *data, /* resource record data */ 170 int datalen, /* length of data */ 171 const u_char *newrr_in, /* new rr for modify or append */ 172 u_char *buf, /* buffer to put query */ 173 int buflen) /* size of buffer */ 174 { 175 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 176 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 177 return (-1); 178 } 179 return (res_nmkquery(&_res, op, dname, class, type, 180 data, datalen, 181 newrr_in, buf, buflen)); 182 } 183 184 #ifdef _LIBRESOLV 185 int 186 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 187 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 188 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 189 return (-1); 190 } 191 192 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 193 } 194 #endif 195 196 int 197 res_query(const char *name, /* domain name */ 198 int class, int type, /* class and type of query */ 199 u_char *answer, /* buffer to put answer */ 200 int anslen) /* size of answer buffer */ 201 { 202 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 203 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 204 return (-1); 205 } 206 return (res_nquery(&_res, name, class, type, answer, anslen)); 207 } 208 209 void 210 res_send_setqhook(res_send_qhook hook) { 211 _res.qhook = hook; 212 } 213 214 void 215 res_send_setrhook(res_send_rhook hook) { 216 _res.rhook = hook; 217 } 218 219 int 220 res_isourserver(const struct sockaddr_in *inp) { 221 return (res_ourserver_p(&_res, (const struct sockaddr *)(const void *)inp)); 222 } 223 224 int 225 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 226 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 227 /* errno should have been set by res_init() in this case. */ 228 return (-1); 229 } 230 231 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 232 } 233 234 #ifdef _LIBRESOLV 235 int 236 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 237 u_char *ans, int anssiz) 238 { 239 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 240 /* errno should have been set by res_init() in this case. */ 241 return (-1); 242 } 243 244 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 245 } 246 #endif 247 248 void 249 res_close(void) { 250 res_nclose(&_res); 251 } 252 253 #ifdef _LIBRESOLV 254 int 255 res_update(ns_updrec *rrecp_in) { 256 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 257 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 258 return (-1); 259 } 260 261 return (res_nupdate(&_res, rrecp_in, NULL)); 262 } 263 #endif 264 265 int 266 res_search(const char *name, /* domain name */ 267 int class, int type, /* class and type of query */ 268 u_char *answer, /* buffer to put answer */ 269 int anslen) /* size of answer */ 270 { 271 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 272 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 273 return (-1); 274 } 275 276 return (res_nsearch(&_res, name, class, type, answer, anslen)); 277 } 278 279 int 280 res_querydomain(const char *name, 281 const char *domain, 282 int class, int type, /* class and type of query */ 283 u_char *answer, /* buffer to put answer */ 284 int anslen) /* size of answer */ 285 { 286 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 287 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 288 return (-1); 289 } 290 291 return (res_nquerydomain(&_res, name, domain, 292 class, type, 293 answer, anslen)); 294 } 295 296 int 297 res_opt(int a, u_char *b, int c, int d) 298 { 299 return res_nopt(&_res, a, b, c, d); 300 } 301 302 const char * 303 hostalias(const char *name) { 304 static char abuf[MAXDNAME]; 305 306 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 307 } 308 309 #ifdef ultrix 310 int 311 local_hostname_length(const char *hostname) { 312 int len_host, len_domain; 313 314 if (!*_res.defdname) 315 res_init(); 316 len_host = strlen(hostname); 317 len_domain = strlen(_res.defdname); 318 if (len_host > len_domain && 319 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 320 hostname[len_host - len_domain - 1] == '.') 321 return (len_host - len_domain - 1); 322 return (0); 323 } 324 #endif /*ultrix*/ 325 326 #endif 327
Indexes created Tue Sep 23 07:09:52 GMT 2025