2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1995-1999 by Internet Software Consortium.
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $";
20 #endif /* LIBC_SCCS and not lint */
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
24 #include "port_before.h"
26 #include <sys/types.h>
27 #include <sys/param.h>
28 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
33 #include <arpa/nameser.h>
38 #include <res_update.h>
44 #include "port_after.h"
46 const char *_res_opcodes[] = {
50 "CQUERYU", /*%< experimental */
51 "NOTIFY", /*%< experimental */
66 const char *_res_sectioncodes[] = {
74 #ifndef __BIND_NOSTATIC
78 int res_ourserver_p(const res_state, const struct sockaddr_in *);
82 extern int __res_vinit(res_state, int);
83 res_state statp = &_res;
86 * These three fields used to be statically initialized. This made
87 * it hard to use this code in a shared library. It is necessary,
88 * now that we're doing dynamic initialization here, that we preserve
89 * the old semantics: if an application modifies one of these three
90 * fields of _res before res_init() is called, res_init() will not
91 * alter them. Of course, if an application is setting them to
92 * _zero_ before calling res_init(), hoping to override what used
93 * to be the static default, we can't detect it and unexpected results
94 * will follow. Zero for any of these fields would make no sense,
95 * so one can safely assume that the applications were already getting
98 * _res.options is tricky since some apps were known to diddle the bits
99 * before res_init() was first called. We can't replicate that semantic
100 * with dynamic initialization (they may have turned bits off that are
101 * set in RES_DEFAULT). Our solution is to declare such applications
102 * "broken". They could fool us by setting RES_INIT but none do (yet).
105 statp->retrans = RES_TIMEOUT;
107 statp->retry = RES_DFLRETRY;
108 if (!(statp->options & RES_INIT))
109 statp->options = RES_DEFAULT;
111 return (__res_vinit(statp, 1));
115 p_query(const u_char *msg) {
116 fp_query(msg, stdout);
120 fp_query(const u_char *msg, FILE *file) {
121 fp_nquery(msg, PACKETSZ, file);
125 fp_nquery(const u_char *msg, int len, FILE *file) {
126 res_state statp = &_res;
127 if ((statp->options & RES_INIT) == 0U && res_init() == -1)
130 res_pquery(statp, msg, len, file);
134 res_mkquery(int op, /*!< opcode of query */
135 const char *dname, /*!< domain name */
136 int class, int type, /*!< class and type of query */
137 const u_char *data, /*!< resource record data */
138 int datalen, /*!< length of data */
139 const u_char *newrr_in, /*!< new rr for modify or append */
140 u_char *buf, /*!< buffer to put query */
141 int buflen) /*!< size of buffer */
143 res_state statp = &_res;
144 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
145 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
148 return (res_nmkquery(statp, op, dname, class, type,
150 newrr_in, buf, buflen));
154 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
155 res_state statp = &_res;
156 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
157 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
161 return (res_nmkupdate(statp, rrecp_in, buf, buflen));
165 res_query(const char *name, /*!< domain name */
166 int class, int type, /*!< class and type of query */
167 u_char *answer, /*!< buffer to put answer */
168 int anslen) /*!< size of answer buffer */
170 res_state statp = &_res;
171 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
172 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
175 return (res_nquery(statp, name, class, type, answer, anslen));
180 res_send_setqhook(res_send_qhook hook) {
185 res_send_setrhook(res_send_rhook hook) {
191 res_isourserver(const struct sockaddr_in *inp) {
192 return (res_ourserver_p(&_res, inp));
196 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
197 res_state statp = &_res;
198 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
199 /* errno should have been set by res_init() in this case. */
203 return (res_nsend(statp, buf, buflen, ans, anssiz));
208 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
209 u_char *ans, int anssiz)
211 res_state statp = &_res;
212 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
213 /* errno should have been set by res_init() in this case. */
217 return (res_nsendsigned(statp, buf, buflen, key, ans, anssiz));
227 res_update(ns_updrec *rrecp_in) {
228 res_state statp = &_res;
229 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
230 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
234 return (res_nupdate(statp, rrecp_in, NULL));
238 res_search(const char *name, /*!< domain name */
239 int class, int type, /*!< class and type of query */
240 u_char *answer, /*!< buffer to put answer */
241 int anslen) /*!< size of answer */
243 res_state statp = &_res;
244 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
245 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
249 return (res_nsearch(statp, name, class, type, answer, anslen));
253 res_querydomain(const char *name,
255 int class, int type, /*!< class and type of query */
256 u_char *answer, /*!< buffer to put answer */
257 int anslen) /*!< size of answer */
259 res_state statp = &_res;
260 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
261 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
265 return (res_nquerydomain(statp, name, domain,
272 res_state statp = &_res;
273 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
274 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
278 return (res_nrandomid(statp));
282 res_opt(int n0, u_char *buf, int buflen, int anslen)
284 return (res_nopt(&_res, n0, buf, buflen, anslen));
288 hostalias(const char *name) {
289 static char abuf[MAXDNAME];
291 return (res_hostalias(&_res, name, abuf, sizeof abuf));
296 local_hostname_length(const char *hostname) {
297 int len_host, len_domain;
301 if (!*statp->defdname)
303 len_host = strlen(hostname);
304 len_domain = strlen(statp->defdname);
305 if (len_host > len_domain &&
306 !strcasecmp(hostname + len_host - len_domain, statp->defdname) &&
307 hostname[len_host - len_domain - 1] == '.')
308 return (len_host - len_domain - 1);
314 * Weak aliases for applications that use certain private entry points,
315 * and fail to include <resolv.h>.
318 __weak_reference(__res_init, res_init);
320 __weak_reference(__p_query, p_query);
322 __weak_reference(__res_mkquery, res_mkquery);
324 __weak_reference(__res_query, res_query);
326 __weak_reference(__res_send, res_send);
328 __weak_reference(__res_close, _res_close);
330 __weak_reference(__res_search, res_search);
331 #undef res_querydomain
332 __weak_reference(__res_querydomain, res_querydomain);