res_data.c revision 1.3
1 /* $NetBSD: res_data.c,v 1.3 2004/05/20 19:31:52 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 #if defined(LIBC_SCCS) && !defined(lint) 21 static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp"; 22 #endif /* LIBC_SCCS and not lint */ 23 24 #include "port_before.h" 25 26 #include <sys/types.h> 27 #include <sys/param.h> 28 #include <sys/socket.h> 29 #include <sys/time.h> 30 31 #include <netinet/in.h> 32 #include <arpa/inet.h> 33 #include <arpa/nameser.h> 34 35 #include <ctype.h> 36 #include <netdb.h> 37 #include <resolv.h> 38 #include <res_update.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "port_after.h" 45 #undef _res 46 47 const char *_res_opcodes[] = { 48 "QUERY", 49 "IQUERY", 50 "CQUERYM", 51 "CQUERYU", /* experimental */ 52 "NOTIFY", /* experimental */ 53 "UPDATE", 54 "6", 55 "7", 56 "8", 57 "9", 58 "10", 59 "11", 60 "12", 61 "13", 62 "ZONEINIT", 63 "ZONEREF", 64 }; 65 66 #ifdef BIND_UPDATE 67 const char *_res_sectioncodes[] = { 68 "ZONE", 69 "PREREQUISITES", 70 "UPDATE", 71 "ADDITIONAL", 72 }; 73 #endif 74 75 #ifndef __BIND_NOSTATIC 76 struct __res_state _res 77 # if defined(__BIND_RES_TEXT) 78 = { RES_TIMEOUT, } /* Motorola, et al. */ 79 # endif 80 ; 81 82 /* Proto. */ 83 84 int res_ourserver_p(const res_state, const struct sockaddr *); 85 86 int 87 res_init(void) { 88 extern int __res_vinit(res_state, int); 89 90 /* 91 * These three fields used to be statically initialized. This made 92 * it hard to use this code in a shared library. It is necessary, 93 * now that we're doing dynamic initialization here, that we preserve 94 * the old semantics: if an application modifies one of these three 95 * fields of _res before res_init() is called, res_init() will not 96 * alter them. Of course, if an application is setting them to 97 * _zero_ before calling res_init(), hoping to override what used 98 * to be the static default, we can't detect it and unexpected results 99 * will follow. Zero for any of these fields would make no sense, 100 * so one can safely assume that the applications were already getting 101 * unexpected results. 102 * 103 * _res.options is tricky since some apps were known to diddle the bits 104 * before res_init() was first called. We can't replicate that semantic 105 * with dynamic initialization (they may have turned bits off that are 106 * set in RES_DEFAULT). Our solution is to declare such applications 107 * "broken". They could fool us by setting RES_INIT but none do (yet). 108 */ 109 if (!_res.retrans) 110 _res.retrans = RES_TIMEOUT; 111 if (!_res.retry) 112 _res.retry = 4; 113 if (!(_res.options & RES_INIT)) 114 _res.options = RES_DEFAULT; 115 116 /* 117 * This one used to initialize implicitly to zero, so unless the app 118 * has set it to something in particular, we can randomize it now. 119 */ 120 if (!_res.id) 121 _res.id = res_randomid(); 122 123 return (__res_vinit(&_res, 1)); 124 } 125 126 void 127 p_query(const u_char *msg) { 128 fp_query(msg, stdout); 129 } 130 131 void 132 fp_query(const u_char *msg, FILE *file) { 133 fp_nquery(msg, PACKETSZ, file); 134 } 135 136 void 137 fp_nquery(const u_char *msg, int len, FILE *file) { 138 if ((_res.options & RES_INIT) == 0U && res_init() == -1) 139 return; 140 141 res_pquery(&_res, msg, len, file); 142 } 143 144 int 145 res_mkquery(int op, /* opcode of query */ 146 const char *dname, /* domain name */ 147 int class, int type, /* class and type of query */ 148 const u_char *data, /* resource record data */ 149 int datalen, /* length of data */ 150 const u_char *newrr_in, /* new rr for modify or append */ 151 u_char *buf, /* buffer to put query */ 152 int buflen) /* size of buffer */ 153 { 154 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 155 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 156 return (-1); 157 } 158 return (res_nmkquery(&_res, op, dname, class, type, 159 data, datalen, 160 newrr_in, buf, buflen)); 161 } 162 163 #ifdef _LIBRESOLV 164 int 165 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) { 166 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 167 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 168 return (-1); 169 } 170 171 return (res_nmkupdate(&_res, rrecp_in, buf, buflen)); 172 } 173 #endif 174 175 int 176 res_query(const char *name, /* domain name */ 177 int class, int type, /* class and type of query */ 178 u_char *answer, /* buffer to put answer */ 179 int anslen) /* size of answer buffer */ 180 { 181 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 182 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 183 return (-1); 184 } 185 return (res_nquery(&_res, name, class, type, answer, anslen)); 186 } 187 188 void 189 res_send_setqhook(res_send_qhook hook) { 190 _res.qhook = hook; 191 } 192 193 void 194 res_send_setrhook(res_send_rhook hook) { 195 _res.rhook = hook; 196 } 197 198 int 199 res_isourserver(const struct sockaddr_in *inp) { 200 return (res_ourserver_p(&_res, (const struct sockaddr *)(const void *)inp)); 201 } 202 203 int 204 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) { 205 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 206 /* errno should have been set by res_init() in this case. */ 207 return (-1); 208 } 209 210 return (res_nsend(&_res, buf, buflen, ans, anssiz)); 211 } 212 213 #ifdef _LIBRESOLV 214 int 215 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key, 216 u_char *ans, int anssiz) 217 { 218 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 219 /* errno should have been set by res_init() in this case. */ 220 return (-1); 221 } 222 223 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz)); 224 } 225 #endif 226 227 void 228 res_close(void) { 229 res_nclose(&_res); 230 } 231 232 #ifdef _LIBRESOLV 233 int 234 res_update(ns_updrec *rrecp_in) { 235 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 236 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 237 return (-1); 238 } 239 240 return (res_nupdate(&_res, rrecp_in, NULL)); 241 } 242 #endif 243 244 int 245 res_search(const char *name, /* domain name */ 246 int class, int type, /* class and type of query */ 247 u_char *answer, /* buffer to put answer */ 248 int anslen) /* size of answer */ 249 { 250 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 251 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 252 return (-1); 253 } 254 255 return (res_nsearch(&_res, name, class, type, answer, anslen)); 256 } 257 258 int 259 res_querydomain(const char *name, 260 const char *domain, 261 int class, int type, /* class and type of query */ 262 u_char *answer, /* buffer to put answer */ 263 int anslen) /* size of answer */ 264 { 265 if ((_res.options & RES_INIT) == 0U && res_init() == -1) { 266 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL); 267 return (-1); 268 } 269 270 return (res_nquerydomain(&_res, name, domain, 271 class, type, 272 answer, anslen)); 273 } 274 275 int 276 res_opt(int a, u_char *b, int c, int d) 277 { 278 return res_nopt(&_res, a, b, c, d); 279 } 280 281 const char * 282 hostalias(const char *name) { 283 static char abuf[MAXDNAME]; 284 285 return (res_hostalias(&_res, name, abuf, sizeof abuf)); 286 } 287 288 #ifdef ultrix 289 int 290 local_hostname_length(const char *hostname) { 291 int len_host, len_domain; 292 293 if (!*_res.defdname) 294 res_init(); 295 len_host = strlen(hostname); 296 len_domain = strlen(_res.defdname); 297 if (len_host > len_domain && 298 !strcasecmp(hostname + len_host - len_domain, _res.defdname) && 299 hostname[len_host - len_domain - 1] == '.') 300 return (len_host - len_domain - 1); 301 return (0); 302 } 303 #endif /*ultrix*/ 304 305 #endif 306
Indexes created Mon Sep 22 05:09:51 GMT 2025