2 * Copyright (c) 1995-1999 by Internet Software Consortium.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $";
20 #endif /* LIBC_SCCS and not lint */
22 #include <sys/types.h>
23 #include <sys/param.h>
24 #include <sys/socket.h>
27 #include <netinet/in.h>
28 #include <arpa/inet.h>
29 #include <arpa/nameser.h>
35 #include <res_update.h>
42 const char *_res_opcodes[] = {
46 "CQUERYU", /* experimental */
47 "NOTIFY", /* experimental */
60 libresolv_hidden_data_def (_res_opcodes)
63 const char *_res_sectioncodes[] attribute_hidden = {
71 #ifndef __BIND_NOSTATIC
73 /* The definition has been moved to res_libc.c. */
76 struct __res_state _res
77 # if defined(__BIND_RES_TEXT)
78 = { RES_TIMEOUT, } /* Motorola, et al. */
85 int res_ourserver_p(const res_state, const struct sockaddr_in *);
86 void res_pquery(const res_state, const u_char *, int, FILE *);
90 /* Moved to res_libc.c since res_init() should go into libc.so but the
91 rest of this file not. */
94 extern int __res_vinit(res_state, int);
97 * These three fields used to be statically initialized. This made
98 * it hard to use this code in a shared library. It is necessary,
99 * now that we're doing dynamic initialization here, that we preserve
100 * the old semantics: if an application modifies one of these three
101 * fields of _res before res_init() is called, res_init() will not
102 * alter them. Of course, if an application is setting them to
103 * _zero_ before calling res_init(), hoping to override what used
104 * to be the static default, we can't detect it and unexpected results
105 * will follow. Zero for any of these fields would make no sense,
106 * so one can safely assume that the applications were already getting
107 * unexpected results.
109 * _res.options is tricky since some apps were known to diddle the bits
110 * before res_init() was first called. We can't replicate that semantic
111 * with dynamic initialization (they may have turned bits off that are
112 * set in RES_DEFAULT). Our solution is to declare such applications
113 * "broken". They could fool us by setting RES_INIT but none do (yet).
116 _res.retrans = RES_TIMEOUT;
119 if (!(_res.options & RES_INIT))
120 _res.options = RES_DEFAULT;
123 * This one used to initialize implicitly to zero, so unless the app
124 * has set it to something in particular, we can randomize it now.
127 _res.id = res_randomid();
129 return (__res_vinit(&_res, 1));
134 p_query(const u_char *msg) {
135 fp_query(msg, stdout);
139 fp_query(const u_char *msg, FILE *file) {
140 fp_nquery(msg, PACKETSZ, file);
142 libresolv_hidden_def (fp_query)
145 fp_nquery(const u_char *msg, int len, FILE *file) {
146 if (__res_maybe_init (&_res, 0) == -1)
149 res_pquery(&_res, msg, len, file);
151 libresolv_hidden_def (fp_nquery)
154 res_mkquery(int op, /* opcode of query */
155 const char *dname, /* domain name */
156 int class, int type, /* class and type of query */
157 const u_char *data, /* resource record data */
158 int datalen, /* length of data */
159 const u_char *newrr_in, /* new rr for modify or append */
160 u_char *buf, /* buffer to put query */
161 int buflen) /* size of buffer */
163 if (__res_maybe_init (&_res, 1) == -1) {
164 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
167 return (res_nmkquery(&_res, op, dname, class, type,
169 newrr_in, buf, buflen));
174 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
175 if (__res_maybe_init (&_res, 1) == -1) {
176 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
180 return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
185 res_query(const char *name, /* domain name */
186 int class, int type, /* class and type of query */
187 u_char *answer, /* buffer to put answer */
188 int anslen) /* size of answer buffer */
190 if (__res_maybe_init (&_res, 1) == -1) {
191 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
194 return (res_nquery(&_res, name, class, type, answer, anslen));
198 res_send_setqhook(res_send_qhook hook) {
203 res_send_setrhook(res_send_rhook hook) {
208 res_isourserver(const struct sockaddr_in *inp) {
209 return (res_ourserver_p(&_res, (const struct sockaddr_in6 *) inp));
213 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
214 if (__res_maybe_init (&_res, 1) == -1) {
215 /* errno should have been set by res_init() in this case. */
219 return (res_nsend(&_res, buf, buflen, ans, anssiz));
224 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
225 u_char *ans, int anssiz)
227 if (__res_maybe_init (&_res, 1) == -1) {
228 /* errno should have been set by res_init() in this case. */
232 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
240 * Some stupid programs out there call res_close() before res_init().
241 * Since _res._vcsock isn't explicitly initialized, these means that
242 * we could do a close(0), which might lead to some security problems.
243 * Therefore we check if res_init() was called before by looking at
244 * the RES_INIT bit in _res.options. If it hasn't been set we bail out
246 if ((_res.options & RES_INIT) == 0)
249 /* We don't free the name server addresses because we never
250 did it and it would be done implicitly on shutdown. */
251 __res_iclose(&_res, false);
256 res_update(ns_updrec *rrecp_in) {
257 if (__res_maybe_init (&_res, 1) == -1) {
258 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
262 return (res_nupdate(&_res, rrecp_in, NULL));
267 res_search(const char *name, /* domain name */
268 int class, int type, /* class and type of query */
269 u_char *answer, /* buffer to put answer */
270 int anslen) /* size of answer */
272 if (__res_maybe_init (&_res, 1) == -1) {
273 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
277 return (res_nsearch(&_res, name, class, type, answer, anslen));
281 res_querydomain(const char *name,
283 int class, int type, /* class and type of query */
284 u_char *answer, /* buffer to put answer */
285 int anslen) /* size of answer */
287 if (__res_maybe_init (&_res, 1) == -1) {
288 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
292 return (res_nquerydomain(&_res, name, domain,
298 hostalias(const char *name) {
299 static char abuf[MAXDNAME];
301 return (res_hostalias(&_res, name, abuf, sizeof abuf));
303 libresolv_hidden_def (hostalias)
307 local_hostname_length(const char *hostname) {
308 int len_host, len_domain;
312 len_host = strlen(hostname);
313 len_domain = strlen(_res.defdname);
314 if (len_host > len_domain &&
315 !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
316 hostname[len_host - len_domain - 1] == '.')
317 return (len_host - len_domain - 1);
325 #include <shlib-compat.h>
327 #if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
330 # undef res_querydomain
332 weak_alias (__res_mkquery, res_mkquery);
333 weak_alias (__res_query, res_query);
334 weak_alias (__res_querydomain, res_querydomain);
335 weak_alias (__res_search, res_search);