1 /*
2 * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4
5
6 /*
7 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
8 * Copyright (c) 1995-1999 by Internet Software Consortium.
9 *
10 * Permission to use, copy, modify, and distribute this software for any
11 * purpose with or without fee is hereby granted, provided that the above
12 * copyright notice and this permission notice appear in all copies.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
15 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
17 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
20 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 */
22
23 #if defined(LIBC_SCCS) && !defined(lint)
24 static const char rcsid[] = "$Id: res_data.c,v 1.7 2008/12/11 09:59:00 marka Exp $";
25 #endif /* LIBC_SCCS and not lint */
26
27 #include "port_before.h"
28
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/socket.h>
32 #include <sys/time.h>
33
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
36 #include <arpa/nameser.h>
37
38 #include <ctype.h>
39 #include <netdb.h>
40 #include <resolv.h>
41 #include <res_update.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46
47 #include "port_after.h"
48
49 #ifndef ORIGINAL_ISC_CODE
50 #pragma weak __fp_nquery = fp_nquery
51 #pragma weak __fp_query = fp_query
52 #pragma weak __p_query = p_query
53 #pragma weak __hostalias = hostalias
54 #pragma weak __res_randomid = res_randomid
55 #endif
56
57 const char *_res_opcodes[] = {
58 "QUERY",
59 "IQUERY",
60 "CQUERYM",
61 "CQUERYU", /*%< experimental */
62 "NOTIFY", /*%< experimental */
63 "UPDATE",
64 "6",
65 "7",
66 "8",
67 "9",
68 "10",
69 "11",
70 "12",
71 "13",
72 "ZONEINIT",
73 "ZONEREF",
74 };
75
76 #ifdef BIND_UPDATE
77 const char *_res_sectioncodes[] = {
78 "ZONE",
79 "PREREQUISITES",
80 "UPDATE",
81 "ADDITIONAL",
82 };
83 #endif
84
85 #undef _res
86 #ifndef __BIND_NOSTATIC
87 struct __res_state _res
88 # if defined(__BIND_RES_TEXT)
89 = { RES_TIMEOUT, } /*%< Motorola, et al. */
90 # endif
91 ;
92
93 #ifdef ORIGINAL_ISC_CODE
94 #if defined(DO_PTHREADS) || defined(__linux)
95 #define _res (*__res_state())
96 #endif
97 #endif
98
99 /* Proto. */
100
101 int res_ourserver_p(const res_state, const struct sockaddr_in *);
102
103 int
res_init(void)104 res_init(void) {
105 extern int __res_vinit(res_state, int);
106
107 /*
108 * These three fields used to be statically initialized. This made
109 * it hard to use this code in a shared library. It is necessary,
110 * now that we're doing dynamic initialization here, that we preserve
111 * the old semantics: if an application modifies one of these three
112 * fields of _res before res_init() is called, res_init() will not
113 * alter them. Of course, if an application is setting them to
114 * _zero_ before calling res_init(), hoping to override what used
115 * to be the static default, we can't detect it and unexpected results
116 * will follow. Zero for any of these fields would make no sense,
117 * so one can safely assume that the applications were already getting
118 * unexpected results.
119 *
120 * _res.options is tricky since some apps were known to diddle the bits
121 * before res_init() was first called. We can't replicate that semantic
122 * with dynamic initialization (they may have turned bits off that are
123 * set in RES_DEFAULT). Our solution is to declare such applications
124 * "broken". They could fool us by setting RES_INIT but none do (yet).
125 */
126 if (!_res.retrans)
127 _res.retrans = RES_TIMEOUT;
128 if (!_res.retry)
129 _res.retry = 4;
130 if (!(_res.options & RES_INIT))
131 _res.options = RES_DEFAULT;
132
133 /*
134 * This one used to initialize implicitly to zero, so unless the app
135 * has set it to something in particular, we can randomize it now.
136 */
137 if (!_res.id)
138 _res.id = res_nrandomid(&_res);
139
140 return (__res_vinit(&_res, 1));
141 }
142
143 void
p_query(const u_char * msg)144 p_query(const u_char *msg) {
145 fp_query(msg, stdout);
146 }
147
148 void
fp_query(const u_char * msg,FILE * file)149 fp_query(const u_char *msg, FILE *file) {
150 fp_nquery(msg, PACKETSZ, file);
151 }
152
153 void
fp_nquery(const u_char * msg,int len,FILE * file)154 fp_nquery(const u_char *msg, int len, FILE *file) {
155 if ((_res.options & RES_INIT) == 0U && res_init() == -1)
156 return;
157
158 res_pquery(&_res, msg, len, file);
159 }
160
161 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)162 res_mkquery(int op, /*!< opcode of query */
163 const char *dname, /*!< domain name */
164 int class, int type, /*!< class and type of query */
165 const u_char *data, /*!< resource record data */
166 int datalen, /*!< length of data */
167 const u_char *newrr_in, /*!< new rr for modify or append */
168 u_char *buf, /*!< buffer to put query */
169 int buflen) /*!< size of buffer */
170 {
171 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
172 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
173 return (-1);
174 }
175 return (res_nmkquery(&_res, op, dname, class, type,
176 data, datalen,
177 newrr_in, buf, buflen));
178 }
179
180 int
res_mkupdate(ns_updrec * rrecp_in,u_char * buf,int buflen)181 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
182 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
183 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
184 return (-1);
185 }
186
187 return (res_nmkupdate(&_res, rrecp_in, buf, buflen));
188 }
189
190 int
res_query(const char * name,int class,int type,u_char * answer,int anslen)191 res_query(const char *name, /*!< domain name */
192 int class, int type, /*!< class and type of query */
193 u_char *answer, /*!< buffer to put answer */
194 int anslen) /*!< size of answer buffer */
195 {
196 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
197 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
198 return (-1);
199 }
200 return (res_nquery(&_res, name, class, type, answer, anslen));
201 }
202
203 void
res_send_setqhook(res_send_qhook hook)204 res_send_setqhook(res_send_qhook hook) {
205 _res.qhook = hook;
206 }
207
208 void
res_send_setrhook(res_send_rhook hook)209 res_send_setrhook(res_send_rhook hook) {
210 _res.rhook = hook;
211 }
212
213 int
res_isourserver(const struct sockaddr_in * inp)214 res_isourserver(const struct sockaddr_in *inp) {
215 return (res_ourserver_p(&_res, inp));
216 }
217
218 int
res_send(const u_char * buf,int buflen,u_char * ans,int anssiz)219 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
220 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
221 /* errno should have been set by res_init() in this case. */
222 return (-1);
223 }
224
225 return (res_nsend(&_res, buf, buflen, ans, anssiz));
226 }
227
228 int
res_sendsigned(const u_char * buf,int buflen,ns_tsig_key * key,u_char * ans,int anssiz)229 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
230 u_char *ans, int anssiz)
231 {
232 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
233 /* errno should have been set by res_init() in this case. */
234 return (-1);
235 }
236
237 return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
238 }
239
240 void
res_close(void)241 res_close(void) {
242 res_nclose(&_res);
243 }
244
245 int
res_update(ns_updrec * rrecp_in)246 res_update(ns_updrec *rrecp_in) {
247 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
248 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
249 return (-1);
250 }
251
252 return (res_nupdate(&_res, rrecp_in, NULL));
253 }
254
255 int
res_search(const char * name,int class,int type,u_char * answer,int anslen)256 res_search(const char *name, /*!< domain 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 */
260 {
261 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
262 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
263 return (-1);
264 }
265
266 return (res_nsearch(&_res, name, class, type, answer, anslen));
267 }
268
269 int
res_querydomain(const char * name,const char * domain,int class,int type,u_char * answer,int anslen)270 res_querydomain(const char *name,
271 const char *domain,
272 int class, int type, /*!< class and type of query */
273 u_char *answer, /*!< buffer to put answer */
274 int anslen) /*!< size of answer */
275 {
276 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
277 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
278 return (-1);
279 }
280
281 return (res_nquerydomain(&_res, name, domain,
282 class, type,
283 answer, anslen));
284 }
285
286 u_int
res_randomid(void)287 res_randomid(void) {
288 if ((_res.options & RES_INIT) == 0U && res_init() == -1) {
289 RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
290 return (-1);
291 }
292
293 return (res_nrandomid(&_res));
294 }
295
296 const char *
hostalias(const char * name)297 hostalias(const char *name) {
298 static char abuf[MAXDNAME];
299
300 return (res_hostalias(&_res, name, abuf, sizeof abuf));
301 }
302
303 #ifdef ultrix
304 int
local_hostname_length(const char * hostname)305 local_hostname_length(const char *hostname) {
306 int len_host, len_domain;
307
308 if (!*_res.defdname)
309 res_init();
310 len_host = strlen(hostname);
311 len_domain = strlen(_res.defdname);
312 if (len_host > len_domain &&
313 !strcasecmp(hostname + len_host - len_domain, _res.defdname) &&
314 hostname[len_host - len_domain - 1] == '.')
315 return (len_host - len_domain - 1);
316 return (0);
317 }
318 #endif /*ultrix*/
319
320 #endif
321
322 /*! \file */
323