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);
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 _res.retrans = RES_TIMEOUT;
106 _res.retry = RES_DFLRETRY;
107 if (!(_res.options & RES_INIT))
108 _res.options = RES_DEFAULT;
110 return (__res_vinit(&_res, 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 if ((_res.options & RES_INIT) == 0U && res_init() == -1)
128 res_pquery(&_res, msg, len, file);
132 res_mkquery(int op, /*!< opcode of query */
133 const char *dname, /*!< domain name */
134 int class, int type, /*!< class and type of query */
135 const u_char *data, /*!< resource record data */
136 int datalen, /*!< length of data */
137 const u_char *newrr_in, /*!< new rr for modify or append */
138 u_char *buf, /*!< buffer to put query */
139 int buflen) /*!< size of buffer */
141 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
142 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
145 return (res_nmkquery(&_res, op, dname, class, type,
147 newrr_in, buf, buflen));
151 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
152 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
153 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
157 return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
161 res_query(const char *name, /*!< domain name */
162 int class, int type, /*!< class and type of query */
163 u_char *answer, /*!< buffer to put answer */
164 int anslen) /*!< size of answer buffer */
166 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
167 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
170 return (res_nquery(&_res, name, class, type, answer, anslen));
175 res_send_setqhook(res_send_qhook hook) {
180 res_send_setrhook(res_send_rhook hook) {
186 res_isourserver(const struct sockaddr_in *inp) {
187 return (res_ourserver_p(&_res, inp));
191 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
192 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
193 /* errno should have been set by res_init() in this case. */
197 return (res_nsend(&_res, buf, buflen, ans, anssiz));
202 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
203 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. */
210 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
220 res_update(ns_updrec *rrecp_in) {
221 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
222 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
226 return (res_nupdate(&_res, rrecp_in, NULL));
230 res_search(const char *name, /*!< domain name */
231 int class, int type, /*!< class and type of query */
232 u_char *answer, /*!< buffer to put answer */
233 int anslen) /*!< size of answer */
235 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
236 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
240 return (res_nsearch(&_res, name, class, type, answer, anslen));
244 res_querydomain(const char *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 */
250 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
251 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
255 return (res_nquerydomain(&_res, name, domain,
262 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
263 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
267 return (res_nrandomid(&_res));
271 res_opt(int n0, u_char *buf, int buflen, int anslen)
273 return (res_nopt(&_res, n0, buf, buflen, anslen));
277 hostalias(const char *name) {
278 static char abuf[MAXDNAME];
280 return (res_hostalias(&_res, name, abuf, sizeof abuf));
285 local_hostname_length(const char *hostname) {
286 int len_host, len_domain;
290 len_host = strlen(hostname);
291 len_domain = strlen(_res.defdname);
292 if (len_host > len_domain &&
293 !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
294 hostname[len_host - len_domain - 1] == '.')
295 return (len_host - len_domain - 1);
301 * Weak aliases for applications that use certain private entry points,
302 * and fail to include <resolv.h>.
305 __weak_reference(__res_init, res_init);
307 __weak_reference(__p_query, p_query);
309 __weak_reference(__res_mkquery, res_mkquery);
311 __weak_reference(__res_query, res_query);
313 __weak_reference(__res_send, res_send);
315 __weak_reference(__res_close, _res_close);
317 __weak_reference(__res_search, res_search);
318 #undef res_querydomain
319 __weak_reference(__res_querydomain, res_querydomain);