res_data.c revision 1.6
1 /* $NetBSD: res_data.c,v 1.6 2004/05/21 16:03:05 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 1.6 2004/05/21 16:03:05 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 #if 0 53 #ifdef __weak_alias 54 __weak_alias(res_init,_res_init) 55 __weak_alias(res_mkquery,_res_mkquery) 56 __weak_alias(res_send_setqhook,__res_send_setqhook) 57 __weak_alias(res_send_setrhook,__res_send_setrhook) 58 __weak_alias(res_isourserver,__res_isourserver) 59 __weak_alias(res_send,__res_send) 60 __weak_alias(res_close,__res_close) 61 __weak_alias(res_search,_res_search) 62 __weak_alias(res_querydomain,__res_querydomain) 63 __weak_alias(res_opt,_res_opt) 64 __weak_alias(hostalias,__hostalias) 65 #endif 66 #endif 67 68 #undef _res 69 70 const char *_res_opcodes[] = { 71 "QUERY", 72 "IQUERY", 73 "CQUERYM", 74 "CQUERYU", /* experimental */ 75 "NOTIFY", /* experimental */ 76 "UPDATE", 77 "6", 78 "7", 79 "8", 80 "9", 81 "10", 82 "11", 83 "12", 84 "13", 85 "ZONEINIT", 86 "ZONEREF", 87 }; 88 89 #ifdef BIND_UPDATE 90 const char *_res_sectioncodes[] = { 91 "ZONE", 92 "PREREQUISITES", 93 "UPDATE", 94 "ADDITIONAL", 95 }; 96 #endif 97 98 #ifndef __BIND_NOSTATIC 99 struct __res_state _res 100 # if defined(__BIND_RES_TEXT) 101 = { RES_TIMEOUT, } /* Motorola, et al. */ 102 # endif 103 ; 104 105 /* Proto. */ 106 107 int res_ourserver_p(const res_state, const struct sockaddr *); 108 109 int 110 res_init(void) { 111 extern int __res_vinit(res_state, int); 112 113 /* 114 * These three fields used to be statically initialized. This made 115 * it hard to use this code in a shared library. It is necessary, 116 * now that we're doing dynamic initialization here, that we preserve 117 * the old semantics: if an application modifies one of these three 118 * fields of _res before res_init() is called, res_init() will not 119 * alter them. Of course, if an application is setting them to 120 * _zero_ before calling res_init(), hoping to override what used 121 * to be the static default, we can't detect it and unexpected results 122 * will follow. Zero for any of these fields would make no sense, 123 * so one can safely assume that the applications were already getting 124 * unexpected results. 125 * 126 * _res.options is tricky since some apps were known to diddle the bits 127 * before res_init() was first called. We can't replicate that semantic 128 * with dynamic initialization (they may have turned bits off that are 129 * set in RES_DEFAULT). Our solution is to declare such applications 130 * "broken". They could fool us by setting RES_INIT but none do (yet). 131 */ 132 if (!_res.retrans) 133 _res.retrans = RES_TIMEOUT; 134 if (!_res.retry) 135 _res.retry = 4; 136 if (!(_res.options & RES_INIT)) 137 _res.options = RES_DEFAULT; 138 139 /* 140 * This one used to initialize implicitly to zero, so unless the app 141 * has set it to something in particular, we can randomize it now. 142 */ 143 if (!_res.id) 144 _res.id = res_randomid(); 145 146 return (__res_vinit(&_res, 1)); 147 } 148 149 void 150 p_query(const u_char *msg) { 151 fp_query(msg, stdout); 152 } 153 154 void 155 fp_query(const u_char *msg, FILE *file) { 156 fp_nquery(msg, PACKETSZ, file); 157 } 158 159 void 160 fp_nquery(const u_char *msg, int len, FILE *file) { 161 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 162 return; 163 164 res_pquery(&_res, msg, len, file); 165 } 166 167 int 168 res_mkquery(int op, /* opcode of query */ 169 const char *dname, /* domain name */ 170 int class, int type, /* class and type of query */ 171 const u_char *data, /* resource record data */ 172 int datalen, /* length of data */ 173 const u_char *newrr_in, /* new rr for modify or append */ 174 u_char *buf, /* buffer to put query */ 175 int buflen) /* size of buffer */ 176 { 177 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 178 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 179 return (-1); 180 } 181 return (res_nmkquery(&_res, op, dname, class, type, 182 data, datalen, 183 newrr_in, buf, buflen)); 184 } 185 186 #ifdef _LIBRESOLV 187 int 188 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 189 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 190 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 191 return (-1); 192 } 193 194 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 195 } 196 #endif 197 198 int 199 res_query(const char *name, /* domain name */ 200 int class, int type, /* class and type of query */ 201 u_char *answer, /* buffer to put answer */ 202 int anslen) /* size of answer buffer */ 203 { 204 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 205 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 206 return (-1); 207 } 208 return (res_nquery(&_res, name, class, type, answer, anslen)); 209 } 210 211 void 212 res_send_setqhook(res_send_qhook hook) { 213 _res.qhook = hook; 214 } 215 216 void 217 res_send_setrhook(res_send_rhook hook) { 218 _res.rhook = hook; 219 } 220 221 int 222 res_isourserver(const struct sockaddr_in *inp) { 223 return (res_ourserver_p(&_res, (const struct sockaddr *)(const void *)inp)); 224 } 225 226 int 227 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 228 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 229 /* errno should have been set by res_init() in this case. */ 230 return (-1); 231 } 232 233 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 234 } 235 236 #ifdef _LIBRESOLV 237 int 238 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 239 u_char *ans, int anssiz) 240 { 241 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 242 /* errno should have been set by res_init() in this case. */ 243 return (-1); 244 } 245 246 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 247 } 248 #endif 249 250 void 251 res_close(void) { 252 res_nclose(&_res); 253 } 254 255 #ifdef _LIBRESOLV 256 int 257 res_update(ns_updrec *rrecp_in) { 258 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 259 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 260 return (-1); 261 } 262 263 return (res_nupdate(&_res, rrecp_in, NULL)); 264 } 265 #endif 266 267 int 268 res_search(const char *name, /* domain name */ 269 int class, int type, /* class and type of query */ 270 u_char *answer, /* buffer to put answer */ 271 int anslen) /* size of answer */ 272 { 273 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 274 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 275 return (-1); 276 } 277 278 return (res_nsearch(&_res, name, class, type, answer, anslen)); 279 } 280 281 int 282 res_querydomain(const char *name, 283 const char *domain, 284 int class, int type, /* class and type of query */ 285 u_char *answer, /* buffer to put answer */ 286 int anslen) /* size of answer */ 287 { 288 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 289 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 290 return (-1); 291 } 292 293 return (res_nquerydomain(&_res, name, domain, 294 class, type, 295 answer, anslen)); 296 } 297 298 int 299 res_opt(int a, u_char *b, int c, int d) 300 { 301 return res_nopt(&_res, a, b, c, d); 302 } 303 304 const char * 305 hostalias(const char *name) { 306 static char abuf[MAXDNAME]; 307 308 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 309 } 310 311 #ifdef ultrix 312 int 313 local_hostname_length(const char *hostname) { 314 int len_host, len_domain; 315 316 if (!*_res.defdname) 317 res_init(); 318 len_host = strlen(hostname); 319 len_domain = strlen(_res.defdname); 320 if (len_host > len_domain && 321 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 322 hostname[len_host - len_domain - 1] == '.') 323 return (len_host - len_domain - 1); 324 return (0); 325 } 326 #endif /*ultrix*/ 327 328 #endif 329
Indexes created Mon Sep 22 05:09:51 GMT 2025