1 /* 2 * Copyright 2003 by Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * Copyright (c) 1995-1999 by Internet Software Consortium. 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 14 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 16 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 17 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 18 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 19 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 20 * SOFTWARE. 21 */ 22 23 #pragma ident "%Z%%M% %I% %E% SMI" 24 25 #if defined(LIBC_SCCS) && !defined(lint) 26 static const char rcsid[] = "$Id: res_data.c,v 8.18 2000/12/23 08:14:58 vixie Exp $"; 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 #ifdef ORIGINAL_ISC_CODE 53 #else 54 #pragma weak __fp_nquery = fp_nquery 55 #pragma weak __fp_query = fp_query 56 #pragma weak __p_query = p_query 57 #pragma weak __hostalias = hostalias 58 #endif 59 60 const char *_res_opcodes[] = { 61 "QUERY", 62 "IQUERY", 63 "CQUERYM", 64 "CQUERYU", /* experimental */ 65 "NOTIFY", /* experimental */ 66 "UPDATE", 67 "6", 68 "7", 69 "8", 70 "9", 71 "10", 72 "11", 73 "12", 74 "13", 75 "ZONEINIT", 76 "ZONEREF", 77 }; 78 79 #ifdef BIND_UPDATE 80 const char *_res_sectioncodes[] = { 81 "ZONE", 82 "PREREQUISITES", 83 "UPDATE", 84 "ADDITIONAL", 85 }; 86 #endif 87 88 #ifndef __BIND_NOSTATIC 89 struct __res_state _res 90 # if defined(__BIND_RES_TEXT) 91 = { RES_TIMEOUT, } /* Motorola, et al. */ 92 # endif 93 ; 94 95 /* Proto. */ 96 97 int res_ourserver_p(const res_state, const struct sockaddr_in *); 98 99 int 100 res_init(void) { 101 extern int __res_vinit(res_state, int); 102 103 /* 104 * These three fields used to be statically initialized. This made 105 * it hard to use this code in a shared library. It is necessary, 106 * now that we're doing dynamic initialization here, that we preserve 107 * the old semantics: if an application modifies one of these three 108 * fields of _res before res_init() is called, res_init() will not 109 * alter them. Of course, if an application is setting them to 110 * _zero_ before calling res_init(), hoping to override what used 111 * to be the static default, we can't detect it and unexpected results 112 * will follow. Zero for any of these fields would make no sense, 113 * so one can safely assume that the applications were already getting 114 * unexpected results. 115 * 116 * _res.options is tricky since some apps were known to diddle the bits 117 * before res_init() was first called. We can't replicate that semantic 118 * with dynamic initialization (they may have turned bits off that are 119 * set in RES_DEFAULT). Our solution is to declare such applications 120 * "broken". They could fool us by setting RES_INIT but none do (yet). 121 */ 122 if (!_res.retrans) 123 _res.retrans = RES_TIMEOUT; 124 if (!_res.retry) 125 _res.retry = 4; 126 if (!(_res.options & RES_INIT)) 127 _res.options = RES_DEFAULT; 128 129 /* 130 * This one used to initialize implicitly to zero, so unless the app 131 * has set it to something in particular, we can randomize it now. 132 */ 133 if (!_res.id) 134 _res.id = res_randomid(); 135 136 return (__res_vinit(&_res, 1)); 137 } 138 139 void 140 p_query(const u_char *msg) { 141 fp_query(msg, stdout); 142 } 143 144 void 145 fp_query(const u_char *msg, FILE *file) { 146 fp_nquery(msg, PACKETSZ, file); 147 } 148 149 void 150 fp_nquery(const u_char *msg, int len, FILE *file) { 151 if ((_res.options & RES_INIT) == 0 && res_init() == -1) 152 return; 153 154 res_pquery(&_res, msg, len, file); 155 } 156 157 int 158 res_mkquery(int op, /* opcode of query */ 159 const char *dname, /* domain name */ 160 int class, int type, /* class and type of query */ 161 const u_char *data, /* resource record data */ 162 int datalen, /* length of data */ 163 const u_char *newrr_in, /* new rr for modify or append */ 164 u_char *buf, /* buffer to put query */ 165 int buflen) /* size of buffer */ 166 { 167 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 168 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 169 return (-1); 170 } 171 return (res_nmkquery(&_res, op, dname, class, type, 172 data, datalen, 173 newrr_in, buf, buflen)); 174 } 175 176 int 177 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 178 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 179 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 180 return (-1); 181 } 182 183 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 184 } 185 186 int 187 res_query(const char *name, /* domain name */ 188 int class, int type, /* class and type of query */ 189 u_char *answer, /* buffer to put answer */ 190 int anslen) /* size of answer buffer */ 191 { 192 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 193 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 194 return (-1); 195 } 196 return (res_nquery(&_res, name, class, type, answer, anslen)); 197 } 198 199 void 200 res_send_setqhook(res_send_qhook hook) { 201 _res.qhook = hook; 202 } 203 204 void 205 res_send_setrhook(res_send_rhook hook) { 206 _res.rhook = hook; 207 } 208 209 int 210 res_isourserver(const struct sockaddr_in *inp) { 211 return (res_ourserver_p(&_res, inp)); 212 } 213 214 int 215 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 216 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 217 /* errno should have been set by res_init() in this case. */ 218 return (-1); 219 } 220 221 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 222 } 223 224 int 225 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 226 u_char *ans, int anssiz) 227 { 228 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 229 /* errno should have been set by res_init() in this case. */ 230 return (-1); 231 } 232 233 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 234 } 235 236 void 237 res_close(void) { 238 res_nclose(&_res); 239 } 240 241 int 242 res_update(ns_updrec *rrecp_in) { 243 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 244 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 245 return (-1); 246 } 247 248 return (res_nupdate(&_res, rrecp_in, NULL)); 249 } 250 251 int 252 res_search(const char *name, /* domain name */ 253 int class, int type, /* class and type of query */ 254 u_char *answer, /* buffer to put answer */ 255 int anslen) /* size of answer */ 256 { 257 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 258 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 259 return (-1); 260 } 261 262 return (res_nsearch(&_res, name, class, type, answer, anslen)); 263 } 264 265 int 266 res_querydomain(const char *name, 267 const char *domain, 268 int class, int type, /* class and type of query */ 269 u_char *answer, /* buffer to put answer */ 270 int anslen) /* size of answer */ 271 { 272 if ((_res.options & RES_INIT) == 0 && res_init() == -1) { 273 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 274 return (-1); 275 } 276 277 return (res_nquerydomain(&_res, name, domain, 278 class, type, 279 answer, anslen)); 280 } 281 282 const char * 283 hostalias(const char *name) { 284 static char abuf[MAXDNAME]; 285 286 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 287 } 288 289 #ifdef ultrix 290 int 291 local_hostname_length(const char *hostname) { 292 int len_host, len_domain; 293 294 if (!*_res.defdname) 295 res_init(); 296 len_host = strlen(hostname); 297 len_domain = strlen(_res.defdname); 298 if (len_host > len_domain && 299 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 300 hostname[len_host - len_domain - 1] == '.') 301 return (len_host - len_domain - 1); 302 return (0); 303 } 304 #endif /*ultrix*/ 305 306 #endif 307