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 1.3.18.2 2007/09/14 05:35:47 marka Exp $";
20 #endif /* LIBC_SCCS and not lint */
22 #include "port_before.h"
24 #include <sys/types.h>
25 #include <sys/param.h>
26 #include <sys/socket.h>
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
31 #include <arpa/nameser.h>
36 #include <res_update.h>
42 #include "port_after.h"
44 const char *_res_opcodes[] = {
48 "CQUERYU", /*%< experimental */
49 "NOTIFY", /*%< experimental */
64 const char *_res_sectioncodes[] = {
73 #ifndef __BIND_NOSTATIC
74 struct __res_state _res
75 # if defined(__BIND_RES_TEXT)
76 = { RES_TIMEOUT, } /*%< Motorola, et al. */
80 #if defined(DO_PTHREADS) || defined(__linux)
81 #define _res (*__res_state())
86 int res_ourserver_p(const res_state, const struct sockaddr_in *);
90 extern int __res_vinit(res_state, int);
93 * These three fields used to be statically initialized. This made
94 * it hard to use this code in a shared library. It is necessary,
95 * now that we're doing dynamic initialization here, that we preserve
96 * the old semantics: if an application modifies one of these three
97 * fields of _res before res_init() is called, res_init() will not
98 * alter them. Of course, if an application is setting them to
99 * _zero_ before calling res_init(), hoping to override what used
100 * to be the static default, we can't detect it and unexpected results
101 * will follow. Zero for any of these fields would make no sense,
102 * so one can safely assume that the applications were already getting
103 * unexpected results.
105 * _res.options is tricky since some apps were known to diddle the bits
106 * before res_init() was first called. We can't replicate that semantic
107 * with dynamic initialization (they may have turned bits off that are
108 * set in RES_DEFAULT). Our solution is to declare such applications
109 * "broken". They could fool us by setting RES_INIT but none do (yet).
112 _res.retrans = RES_TIMEOUT;
115 if (!(_res.options & RES_INIT))
116 _res.options = RES_DEFAULT;
119 * This one used to initialize implicitly to zero, so unless the app
120 * has set it to something in particular, we can randomize it now.
123 _res.id = res_randomid();
125 return (__res_vinit(&_res, 1));
129 p_query(const u_char *msg) {
130 fp_query(msg, stdout);
134 fp_query(const u_char *msg, FILE *file) {
135 fp_nquery(msg, PACKETSZ, file);
139 fp_nquery(const u_char *msg, int len, FILE *file) {
140 if ((_res.options & RES_INIT) == 0U && res_init() == -1)
143 res_pquery(&_res, msg, len, file);
147 res_mkquery(int op, /*!< opcode of query */
148 const char *dname, /*!< domain name */
149 int class, int type, /*!< class and type of query */
150 const u_char *data, /*!< resource record data */
151 int datalen, /*!< length of data */
152 const u_char *newrr_in, /*!< new rr for modify or append */
153 u_char *buf, /*!< buffer to put query */
154 int buflen) /*!< size of buffer */
156 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
157 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
160 return (res_nmkquery(&_res, op, dname, class, type,
162 newrr_in, buf, buflen));
166 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
167 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
168 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
172 return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
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 */
181 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
182 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
185 return (res_nquery(&_res, name, class, type, answer, anslen));
189 res_send_setqhook(res_send_qhook hook) {
194 res_send_setrhook(res_send_rhook hook) {
199 res_isourserver(const struct sockaddr_in *inp) {
200 return (res_ourserver_p(&_res, inp));
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. */
210 return (res_nsend(&_res, buf, buflen, ans, anssiz));
214 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
215 u_char *ans, int anssiz)
217 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
218 /* errno should have been set by res_init() in this case. */
222 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
231 res_update(ns_updrec *rrecp_in) {
232 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
233 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
237 return (res_nupdate(&_res, rrecp_in, NULL));
241 res_search(const char *name, /*!< domain name */
242 int class, int type, /*!< class and type of query */
243 u_char *answer, /*!< buffer to put answer */
244 int anslen) /*!< size of answer */
246 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
247 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
251 return (res_nsearch(&_res, name, class, type, answer, anslen));
255 res_querydomain(const char *name,
257 int class, int type, /*!< class and type of query */
258 u_char *answer, /*!< buffer to put answer */
259 int anslen) /*!< size of answer */
261 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
262 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
266 return (res_nquerydomain(&_res, name, domain,
272 hostalias(const char *name) {
273 static char abuf[MAXDNAME];
275 return (res_hostalias(&_res, name, abuf, sizeof abuf));
280 local_hostname_length(const char *hostname) {
281 int len_host, len_domain;
285 len_host = strlen(hostname);
286 len_domain = strlen(_res.defdname);
287 if (len_host > len_domain &&
288 !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
289 hostname[len_host - len_domain - 1] == '.')
290 return (len_host - len_domain - 1);