1 /*-
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1995-1999 by Internet Software Consortium.
6 *
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.
10 *
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.
18 */
19
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 $";
22 #endif /* LIBC_SCCS and not lint */
23 #include <sys/cdefs.h>
24 __FBSDID("$FreeBSD$");
25
26 #include "port_before.h"
27
28 #include <sys/param.h>
29 #include <sys/socket.h>
30 #include <sys/time.h>
31
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
34 #include <arpa/nameser.h>
35
36 #include <ctype.h>
37 #include <netdb.h>
38 #include <resolv.h>
39 #include <res_update.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "port_after.h"
46
47 const char *_res_opcodes[] = {
48 "QUERY",
49 "IQUERY",
50 "CQUERYM",
51 "CQUERYU", /*%< experimental */
52 "NOTIFY", /*%< experimental */
53 "UPDATE",
54 "6",
55 "7",
56 "8",
57 "9",
58 "10",
59 "11",
60 "12",
61 "13",
62 "ZONEINIT",
63 "ZONEREF",
64 };
65
66 #ifdef BIND_UPDATE
67 const char *_res_sectioncodes[] = {
68 "ZONE",
69 "PREREQUISITES",
70 "UPDATE",
71 "ADDITIONAL",
72 };
73 #endif
74
75 #ifndef __BIND_NOSTATIC
76
77 /* Proto. */
78
79 int res_ourserver_p(const res_state, const struct sockaddr_in *);
80
81 __noinline int
res_init(void)82 res_init(void) {
83 extern int __res_vinit(res_state, int);
84 res_state statp = &_res;
85
86 /*
87 * These three fields used to be statically initialized. This made
88 * it hard to use this code in a shared library. It is necessary,
89 * now that we're doing dynamic initialization here, that we preserve
90 * the old semantics: if an application modifies one of these three
91 * fields of _res before res_init() is called, res_init() will not
92 * alter them. Of course, if an application is setting them to
93 * _zero_ before calling res_init(), hoping to override what used
94 * to be the static default, we can't detect it and unexpected results
95 * will follow. Zero for any of these fields would make no sense,
96 * so one can safely assume that the applications were already getting
97 * unexpected results.
98 *
99 * _res.options is tricky since some apps were known to diddle the bits
100 * before res_init() was first called. We can't replicate that semantic
101 * with dynamic initialization (they may have turned bits off that are
102 * set in RES_DEFAULT). Our solution is to declare such applications
103 * "broken". They could fool us by setting RES_INIT but none do (yet).
104 */
105 if (!statp->retrans)
106 statp->retrans = RES_TIMEOUT;
107 if (!statp->retry)
108 statp->retry = RES_DFLRETRY;
109 if (!(statp->options & RES_INIT))
110 statp->options = RES_DEFAULT;
111
112 return (__res_vinit(statp, 1));
113 }
114
115 void
p_query(const u_char * msg)116 p_query(const u_char *msg) {
117 fp_query(msg, stdout);
118 }
119
120 void
fp_query(const u_char * msg,FILE * file)121 fp_query(const u_char *msg, FILE *file) {
122 fp_nquery(msg, PACKETSZ, file);
123 }
124
125 void
fp_nquery(const u_char * msg,int len,FILE * file)126 fp_nquery(const u_char *msg, int len, FILE *file) {
127 res_state statp = &_res;
128 if ((statp->options & RES_INIT) == 0U && res_init() == -1)
129 return;
130
131 res_pquery(statp, msg, len, file);
132 }
133
134 int
res_mkquery(int op,const char * dname,int class,int type,const u_char * data,int datalen,const u_char * newrr_in,u_char * buf,int buflen)135 res_mkquery(int op, /*!< opcode of query */
136 const char *dname, /*!< domain name */
137 int class, int type, /*!< class and type of query */
138 const u_char *data, /*!< resource record data */
139 int datalen, /*!< length of data */
140 const u_char *newrr_in, /*!< new rr for modify or append */
141 u_char *buf, /*!< buffer to put query */
142 int buflen) /*!< size of buffer */
143 {
144 res_state statp = &_res;
145 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
146 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
147 return (-1);
148 }
149 return (res_nmkquery(statp, op, dname, class, type,
150 data, datalen,
151 newrr_in, buf, buflen));
152 }
153
154 int
res_mkupdate(ns_updrec * rrecp_in,u_char * buf,int buflen)155 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
156 res_state statp = &_res;
157 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
158 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
159 return (-1);
160 }
161
162 return (res_nmkupdate(statp, rrecp_in, buf, buflen));
163 }
164
165 int
res_query(const char * name,int class,int type,u_char * answer,int anslen)166 res_query(const char *name, /*!< domain name */
167 int class, int type, /*!< class and type of query */
168 u_char *answer, /*!< buffer to put answer */
169 int anslen) /*!< size of answer buffer */
170 {
171 res_state statp = &_res;
172 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
173 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
174 return (-1);
175 }
176 return (res_nquery(statp, name, class, type, answer, anslen));
177 }
178
179 #ifndef _LIBC
180 void
res_send_setqhook(res_send_qhook hook)181 res_send_setqhook(res_send_qhook hook) {
182 _res.qhook = hook;
183 }
184
185 void
res_send_setrhook(res_send_rhook hook)186 res_send_setrhook(res_send_rhook hook) {
187 _res.rhook = hook;
188 }
189 #endif
190
191 int
res_isourserver(const struct sockaddr_in * inp)192 res_isourserver(const struct sockaddr_in *inp) {
193 return (res_ourserver_p(&_res, inp));
194 }
195
196 int
res_send(const u_char * buf,int buflen,u_char * ans,int anssiz)197 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
198 res_state statp = &_res;
199 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
200 /* errno should have been set by res_init() in this case. */
201 return (-1);
202 }
203
204 return (res_nsend(statp, buf, buflen, ans, anssiz));
205 }
206
207 #ifndef _LIBC
208 int
res_sendsigned(const u_char * buf,int buflen,ns_tsig_key * key,u_char * ans,int anssiz)209 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
210 u_char *ans, int anssiz)
211 {
212 res_state statp = &_res;
213 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
214 /* errno should have been set by res_init() in this case. */
215 return (-1);
216 }
217
218 return (res_nsendsigned(statp, buf, buflen, key, ans, anssiz));
219 }
220 #endif
221
222 void
res_close(void)223 res_close(void) {
224 res_nclose(&_res);
225 }
226
227 int
res_update(ns_updrec * rrecp_in)228 res_update(ns_updrec *rrecp_in) {
229 res_state statp = &_res;
230 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
231 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
232 return (-1);
233 }
234
235 return (res_nupdate(statp, rrecp_in, NULL));
236 }
237
238 int
res_search(const char * name,int class,int type,u_char * answer,int anslen)239 res_search(const char *name, /*!< domain name */
240 int class, int type, /*!< class and type of query */
241 u_char *answer, /*!< buffer to put answer */
242 int anslen) /*!< size of answer */
243 {
244 res_state statp = &_res;
245 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
246 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
247 return (-1);
248 }
249
250 return (res_nsearch(statp, name, class, type, answer, anslen));
251 }
252
253 int
res_querydomain(const char * name,const char * domain,int class,int type,u_char * answer,int anslen)254 res_querydomain(const char *name,
255 const char *domain,
256 int class, int type, /*!< class and type of query */
257 u_char *answer, /*!< buffer to put answer */
258 int anslen) /*!< size of answer */
259 {
260 res_state statp = &_res;
261 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
262 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
263 return (-1);
264 }
265
266 return (res_nquerydomain(statp, name, domain,
267 class, type,
268 answer, anslen));
269 }
270
271 u_int
res_randomid(void)272 res_randomid(void) {
273 res_state statp = &_res;
274 if ((statp->options & RES_INIT) == 0U && res_init() == -1) {
275 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
276 return (-1);
277 }
278
279 return (res_nrandomid(statp));
280 }
281
282 int
res_opt(int n0,u_char * buf,int buflen,int anslen)283 res_opt(int n0, u_char *buf, int buflen, int anslen)
284 {
285 return (res_nopt(&_res, n0, buf, buflen, anslen));
286 }
287
288 const char *
hostalias(const char * name)289 hostalias(const char *name) {
290 static char abuf[MAXDNAME];
291
292 return (res_hostalias(&_res, name, abuf, sizeof abuf));
293 }
294
295 #ifdef ultrix
296 int
local_hostname_length(const char * hostname)297 local_hostname_length(const char *hostname) {
298 int len_host, len_domain;
299 res_state statp;
300
301 statp = &_res;
302 if (!*statp->defdname)
303 res_init();
304 len_host = strlen(hostname);
305 len_domain = strlen(statp->defdname);
306 if (len_host > len_domain &&
307 !strcasecmp(hostname + len_host - len_domain, statp->defdname) &&
308 hostname[len_host - len_domain - 1] == '.')
309 return (len_host - len_domain - 1);
310 return (0);
311 }
312 #endif /*ultrix*/
313
314 /*
315 * Weak aliases for applications that use certain private entry points,
316 * and fail to include <resolv.h>.
317 */
318 #undef res_init
319 __weak_reference(__res_init, res_init);
320 #undef p_query
321 __weak_reference(__p_query, p_query);
322 #undef res_mkquery
323 __weak_reference(__res_mkquery, res_mkquery);
324 #undef res_query
325 __weak_reference(__res_query, res_query);
326 #undef res_send
327 __weak_reference(__res_send, res_send);
328 #undef res_close
329 __weak_reference(__res_close, _res_close);
330 #undef res_search
331 __weak_reference(__res_search, res_search);
332 #undef res_querydomain
333 __weak_reference(__res_querydomain, res_querydomain);
334
335 #endif
336
337 /*! \file */
338