2 * SPDX-License-Identifier: ISC
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1995-1999 by Internet Software Consortium.
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.
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.
20 #if defined(LIBC_SCCS) && !defined(lint)
21 static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $";
22 #endif /* LIBC_SCCS and not lint */
23 #include <sys/cdefs.h>
24 #include "port_before.h"
26 #include <sys/param.h>
27 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <arpa/inet.h>
32 #include <arpa/nameser.h>
37 #include <res_update.h>
43 #include "port_after.h"
45 const char *_res_opcodes[] = {
49 "CQUERYU", /*%< experimental */
50 "NOTIFY", /*%< experimental */
65 const char *_res_sectioncodes[] = {
73 #ifndef __BIND_NOSTATIC
77 int res_ourserver_p(const res_state, const struct sockaddr_in *);
81 extern int __res_vinit(res_state, int);
82 res_state statp = &_res;
85 * These three fields used to be statically initialized. This made
86 * it hard to use this code in a shared library. It is necessary,
87 * now that we're doing dynamic initialization here, that we preserve
88 * the old semantics: if an application modifies one of these three
89 * fields of _res before res_init() is called, res_init() will not
90 * alter them. Of course, if an application is setting them to
91 * _zero_ before calling res_init(), hoping to override what used
92 * to be the static default, we can't detect it and unexpected results
93 * will follow. Zero for any of these fields would make no sense,
94 * so one can safely assume that the applications were already getting
97 * _res.options is tricky since some apps were known to diddle the bits
98 * before res_init() was first called. We can't replicate that semantic
99 * with dynamic initialization (they may have turned bits off that are
100 * set in RES_DEFAULT). Our solution is to declare such applications
101 * "broken". They could fool us by setting RES_INIT but none do (yet).
104 statp->retrans = RES_TIMEOUT;
106 statp->retry = RES_DFLRETRY;
107 if (!(statp->options & RES_INIT))
108 statp->options = RES_DEFAULT;
110 return (__res_vinit(statp, 1));
114 p_query(const u_char *msg) {
115 fp_query(msg, stdout);
119 fp_query(const u_char *msg, FILE *file) {
120 fp_nquery(msg, PACKETSZ, file);
124 fp_nquery(const u_char *msg, int len, FILE *file) {
125 res_state statp = &_res;
126 if ((statp->options & RES_INIT) == 0U && res_init() == -1)
129 res_pquery(statp, msg, len, file);
133 res_mkquery(int op, /*!< opcode of query */
134 const char *dname, /*!< domain name */
135 int class, int type, /*!< class and type of query */
136 const u_char *data, /*!< resource record data */
137 int datalen, /*!< length of data */
138 const u_char *newrr_in, /*!< new rr for modify or append */
139 u_char *buf, /*!< buffer to put query */
140 int buflen) /*!< size of buffer */
142 res_state statp = &_res;
143 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
144 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
147 return (res_nmkquery(statp, op, dname, class, type,
149 newrr_in, buf, buflen));
153 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
154 res_state statp = &_res;
155 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
156 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
160 return (res_nmkupdate(statp, rrecp_in, buf, buflen));
164 res_query(const char *name, /*!< domain name */
165 int class, int type, /*!< class and type of query */
166 u_char *answer, /*!< buffer to put answer */
167 int anslen) /*!< size of answer buffer */
169 res_state statp = &_res;
170 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
171 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
174 return (res_nquery(statp, name, class, type, answer, anslen));
179 res_send_setqhook(res_send_qhook hook) {
184 res_send_setrhook(res_send_rhook hook) {
190 res_isourserver(const struct sockaddr_in *inp) {
191 return (res_ourserver_p(&_res, inp));
195 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
196 res_state statp = &_res;
197 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
198 /* errno should have been set by res_init() in this case. */
202 return (res_nsend(statp, buf, buflen, ans, anssiz));
207 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
208 u_char *ans, int anssiz)
210 res_state statp = &_res;
211 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
212 /* errno should have been set by res_init() in this case. */
216 return (res_nsendsigned(statp, buf, buflen, key, ans, anssiz));
226 res_update(ns_updrec *rrecp_in) {
227 res_state statp = &_res;
228 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
229 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
233 return (res_nupdate(statp, rrecp_in, NULL));
237 res_search(const char *name, /*!< domain name */
238 int class, int type, /*!< class and type of query */
239 u_char *answer, /*!< buffer to put answer */
240 int anslen) /*!< size of answer */
242 res_state statp = &_res;
243 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
244 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
248 return (res_nsearch(statp, name, class, type, answer, anslen));
252 res_querydomain(const char *name,
254 int class, int type, /*!< class and type of query */
255 u_char *answer, /*!< buffer to put answer */
256 int anslen) /*!< size of answer */
258 res_state statp = &_res;
259 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
260 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
264 return (res_nquerydomain(statp, name, domain,
271 res_state statp = &_res;
272 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
273 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
277 return (res_nrandomid(statp));
281 res_opt(int n0, u_char *buf, int buflen, int anslen)
283 return (res_nopt(&_res, n0, buf, buflen, anslen));
287 hostalias(const char *name) {
288 static char abuf[MAXDNAME];
290 return (res_hostalias(&_res, name, abuf, sizeof abuf));
295 local_hostname_length(const char *hostname) {
296 int len_host, len_domain;
300 if (!*statp->defdname)
302 len_host = strlen(hostname);
303 len_domain = strlen(statp->defdname);
304 if (len_host > len_domain &&
305 !strcasecmp(hostname + len_host - len_domain, statp->defdname) &&
306 hostname[len_host - len_domain - 1] == '.')
307 return (len_host - len_domain - 1);
313 * Weak aliases for applications that use certain private entry points,
314 * and fail to include <resolv.h>.
317 __weak_reference(__res_init, res_init);
319 __weak_reference(__p_query, p_query);
321 __weak_reference(__res_mkquery, res_mkquery);
323 __weak_reference(__res_query, res_query);
325 __weak_reference(__res_send, res_send);
327 __weak_reference(__res_close, _res_close);
329 __weak_reference(__res_search, res_search);
330 #undef res_querydomain
331 __weak_reference(__res_querydomain, res_querydomain);