res_data.c revision 1.4
1 /* $NetBSD: res_data.c,v 1.4 2004/05/20 19:43:39 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 1.4 2004/05/20 19:43:39 christos Exp $"); 26 #endif 27 #endif /* LIBC_SCCS and not lint */ 28 29 #include "port_before.h" 30 31 #include <sys/types.h> 32 #include <sys/param.h> 33 #include <sys/socket.h> 34 #include <sys/time.h> 35 36 #include <netinet/in.h> 37 #include <arpa/inet.h> 38 #include <arpa/nameser.h> 39 40 #include <ctype.h> 41 #include <netdb.h> 42 #include <resolv.h> 43 #include <res_update.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "port_after.h" 50 #undef _res 51 52 const char *_res_opcodes[] = { 53 "QUERY", 54 "IQUERY", 55 "CQUERYM", 56 "CQUERYU", /* experimental */ 57 "NOTIFY", /* experimental */ 58 "UPDATE", 59 "6", 60 "7", 61 "8", 62 "9", 63 "10", 64 "11", 65 "12", 66 "13", 67 "ZONEINIT", 68 "ZONEREF", 69 }; 70 71 #ifdef BIND_UPDATE 72 const char *_res_sectioncodes[] = { 73 "ZONE", 74 "PREREQUISITES", 75 "UPDATE", 76 "ADDITIONAL", 77 }; 78 #endif 79 80 #ifndef __BIND_NOSTATIC 81 struct __res_state _res 82 # if defined(__BIND_RES_TEXT) 83 = { RES_TIMEOUT, } /* Motorola, et al. */ 84 # endif 85 ; 86 87 /* Proto. */ 88 89 int res_ourserver_p(const res_state, const struct sockaddr *); 90 91 int 92 res_init(void) { 93 extern int __res_vinit(res_state, int); 94 95 /* 96 * These three fields used to be statically initialized. This made 97 * it hard to use this code in a shared library. It is necessary, 98 * now that we're doing dynamic initialization here, that we preserve 99 * the old semantics: if an application modifies one of these three 100 * fields of _res before res_init() is called, res_init() will not 101 * alter them. Of course, if an application is setting them to 102 * _zero_ before calling res_init(), hoping to override what used 103 * to be the static default, we can't detect it and unexpected results 104 * will follow. Zero for any of these fields would make no sense, 105 * so one can safely assume that the applications were already getting 106 * unexpected results. 107 * 108 * _res.options is tricky since some apps were known to diddle the bits 109 * before res_init() was first called. We can't replicate that semantic 110 * with dynamic initialization (they may have turned bits off that are 111 * set in RES_DEFAULT). Our solution is to declare such applications 112 * "broken". They could fool us by setting RES_INIT but none do (yet). 113 */ 114 if (!_res.retrans) 115 _res.retrans = RES_TIMEOUT; 116 if (!_res.retry) 117 _res.retry = 4; 118 if (!(_res.options & RES_INIT)) 119 _res.options = RES_DEFAULT; 120 121 /* 122 * This one used to initialize implicitly to zero, so unless the app 123 * has set it to something in particular, we can randomize it now. 124 */ 125 if (!_res.id) 126 _res.id = res_randomid(); 127 128 return (__res_vinit(&_res, 1)); 129 } 130 131 void 132 p_query(const u_char *msg) { 133 fp_query(msg, stdout); 134 } 135 136 void 137 fp_query(const u_char *msg, FILE *file) { 138 fp_nquery(msg, PACKETSZ, file); 139 } 140 141 void 142 fp_nquery(const u_char *msg, int len, FILE *file) { 143 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 144 return; 145 146 res_pquery(&_res, msg, len, file); 147 } 148 149 int 150 res_mkquery(int op, /* opcode of query */ 151 const char *dname, /* domain name */ 152 int class, int type, /* class and type of query */ 153 const u_char *data, /* resource record data */ 154 int datalen, /* length of data */ 155 const u_char *newrr_in, /* new rr for modify or append */ 156 u_char *buf, /* buffer to put query */ 157 int buflen) /* size of buffer */ 158 { 159 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 160 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 161 return (-1); 162 } 163 return (res_nmkquery(&_res, op, dname, class, type, 164 data, datalen, 165 newrr_in, buf, buflen)); 166 } 167 168 #ifdef _LIBRESOLV 169 int 170 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 171 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 172 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 173 return (-1); 174 } 175 176 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 177 } 178 #endif 179 180 int 181 res_query(const char *name, /* domain name */ 182 int class, int type, /* class and type of query */ 183 u_char *answer, /* buffer to put answer */ 184 int anslen) /* size of answer buffer */ 185 { 186 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 187 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 188 return (-1); 189 } 190 return (res_nquery(&_res, name, class, type, answer, anslen)); 191 } 192 193 void 194 res_send_setqhook(res_send_qhook hook) { 195 _res.qhook = hook; 196 } 197 198 void 199 res_send_setrhook(res_send_rhook hook) { 200 _res.rhook = hook; 201 } 202 203 int 204 res_isourserver(const struct sockaddr_in *inp) { 205 return (res_ourserver_p(&_res, (const struct sockaddr *)(const void *)inp)); 206 } 207 208 int 209 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 210 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 211 /* errno should have been set by res_init() in this case. */ 212 return (-1); 213 } 214 215 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 216 } 217 218 #ifdef _LIBRESOLV 219 int 220 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 221 u_char *ans, int anssiz) 222 { 223 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 224 /* errno should have been set by res_init() in this case. */ 225 return (-1); 226 } 227 228 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 229 } 230 #endif 231 232 void 233 res_close(void) { 234 res_nclose(&_res); 235 } 236 237 #ifdef _LIBRESOLV 238 int 239 res_update(ns_updrec *rrecp_in) { 240 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 241 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 242 return (-1); 243 } 244 245 return (res_nupdate(&_res, rrecp_in, NULL)); 246 } 247 #endif 248 249 int 250 res_search(const char *name, /* domain name */ 251 int class, int type, /* class and type of query */ 252 u_char *answer, /* buffer to put answer */ 253 int anslen) /* size of answer */ 254 { 255 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 256 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 257 return (-1); 258 } 259 260 return (res_nsearch(&_res, name, class, type, answer, anslen)); 261 } 262 263 int 264 res_querydomain(const char *name, 265 const char *domain, 266 int class, int type, /* class and type of query */ 267 u_char *answer, /* buffer to put answer */ 268 int anslen) /* size of answer */ 269 { 270 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 271 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 272 return (-1); 273 } 274 275 return (res_nquerydomain(&_res, name, domain, 276 class, type, 277 answer, anslen)); 278 } 279 280 int 281 res_opt(int a, u_char *b, int c, int d) 282 { 283 return res_nopt(&_res, a, b, c, d); 284 } 285 286 const char * 287 hostalias(const char *name) { 288 static char abuf[MAXDNAME]; 289 290 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 291 } 292 293 #ifdef ultrix 294 int 295 local_hostname_length(const char *hostname) { 296 int len_host, len_domain; 297 298 if (!*_res.defdname) 299 res_init(); 300 len_host = strlen(hostname); 301 len_domain = strlen(_res.defdname); 302 if (len_host > len_domain && 303 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 304 hostname[len_host - len_domain - 1] == '.') 305 return (len_host - len_domain - 1); 306 return (0); 307 } 308 #endif /*ultrix*/ 309 310 #endif 311
Indexes created Tue Sep 23 07:09:52 GMT 2025