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other-licenses/android/res_data.c

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1 /* $NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $ */
2
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 /*
21 * This version of this file is derived from Android 2.3 "Gingerbread",
22 * which contains uncredited changes by Android/Google developers. It has
23 * been modified in 2011 for use in the Android build of Mozilla Firefox by
24 * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
25 * and Steve Workman <sjhworkman@gmail.com>).
26 * These changes are offered under the same license as the original NetBSD
27 * file, whose copyright and license are unchanged above.
28 */
29
30 #define ANDROID_CHANGES 1
31 #define MOZILLA_NECKO_EXCLUDE_CODE 1
32
33 #include <sys/cdefs.h>
34 #if defined(LIBC_SCCS) && !defined(lint)
35 #ifdef notdef
36 static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp";
37 #else
38 __RCSID("$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $");
39 #endif
40 #endif /* LIBC_SCCS and not lint */
41
42
43
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/socket.h>
47 #include <sys/time.h>
48
49 #include <netinet/in.h>
50 #include <arpa/inet.h>
51 #include "arpa_nameser.h"
52
53 #include <ctype.h>
54 #include <netdb.h>
55 #include "resolv_private.h"
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <unistd.h>
60
61
62 const char * const _res_opcodes[] = {
63 "QUERY",
64 "IQUERY",
65 "CQUERYM",
66 "CQUERYU", /* experimental */
67 "NOTIFY", /* experimental */
68 "UPDATE",
69 "6",
70 "7",
71 "8",
72 "9",
73 "10",
74 "11",
75 "12",
76 "13",
77 "ZONEINIT",
78 "ZONEREF",
79 };
80
81 #ifdef BIND_UPDATE
82 const char * const _res_sectioncodes[] = {
83 "ZONE",
84 "PREREQUISITES",
85 "UPDATE",
86 "ADDITIONAL",
87 };
88 #endif
89
90 #ifndef MOZILLA_NECKO_EXCLUDE_CODE
91 #ifndef __BIND_NOSTATIC
92 extern struct __res_state _nres;
93
94 /* Proto. */
95
96 int res_ourserver_p(const res_state, const struct sockaddr *);
97
98 #ifdef ANDROID_CHANGES
99 int res_need_init() {
100 return ((_nres.options & RES_INIT) == 0U) || res_get_dns_changed();
101 }
102 #else
103 #define res_need_init() ((_nres.options & RES_INIT) == 0U)
104 #endif
105
106 int
107 res_init(void) {
108 int rv;
109 extern int __res_vinit(res_state, int);
110 #ifdef COMPAT__RES
111 /*
112 * Compatibility with program that were accessing _res directly
113 * to set options. We keep another struct res that is the same
114 * size as the original res structure, and then copy fields to
115 * it so that we achieve the same initialization
116 */
117 extern void *__res_get_old_state(void);
118 extern void __res_put_old_state(void *);
119 res_state ores = __res_get_old_state();
120
121 if (ores->options != 0)
122 _nres.options = ores->options;
123 if (ores->retrans != 0)
124 _nres.retrans = ores->retrans;
125 if (ores->retry != 0)
126 _nres.retry = ores->retry;
127 #endif
128
129 /*
130 * These three fields used to be statically initialized. This made
131 * it hard to use this code in a shared library. It is necessary,
132 * now that we're doing dynamic initialization here, that we preserve
133 * the old semantics: if an application modifies one of these three
134 * fields of _res before res_init() is called, res_init() will not
135 * alter them. Of course, if an application is setting them to
136 * _zero_ before calling res_init(), hoping to override what used
137 * to be the static default, we can't detect it and unexpected results
138 * will follow. Zero for any of these fields would make no sense,
139 * so one can safely assume that the applications were already getting
140 * unexpected results.
141 *
142 * _nres.options is tricky since some apps were known to diddle the bits
143 * before res_init() was first called. We can't replicate that semantic
144 * with dynamic initialization (they may have turned bits off that are
145 * set in RES_DEFAULT). Our solution is to declare such applications
146 * "broken". They could fool us by setting RES_INIT but none do (yet).
147 */
148 if (!_nres.retrans)
149 _nres.retrans = RES_TIMEOUT;
150 if (!_nres.retry)
151 _nres.retry = 4;
152 if (!(_nres.options & RES_INIT))
153 _nres.options = RES_DEFAULT;
154
155 /*
156 * This one used to initialize implicitly to zero, so unless the app
157 * has set it to something in particular, we can randomize it now.
158 */
159 if (!_nres.id)
160 _nres.id = res_randomid();
161
162 rv = __res_vinit(&_nres, 1);
163 #ifdef COMPAT__RES
164 __res_put_old_state(&_nres);
165 #endif
166 return rv;
167 }
168
169 void
170 p_query(const u_char *msg) {
171 fp_query(msg, stdout);
172 }
173
174 void
175 fp_query(const u_char *msg, FILE *file) {
176 fp_nquery(msg, PACKETSZ, file);
177 }
178
179 void
180 fp_nquery(const u_char *msg, int len, FILE *file) {
181 if (res_need_init() && res_init() == -1)
182 return;
183
184 res_pquery(&_nres, msg, len, file);
185 }
186
187 int
188 res_mkquery(int op, /* opcode of query */
189 const char *dname, /* domain name */
190 int class, int type, /* class and type of query */
191 const u_char *data, /* resource record data */
192 int datalen, /* length of data */
193 const u_char *newrr_in, /* new rr for modify or append */
194 u_char *buf, /* buffer to put query */
195 int buflen) /* size of buffer */
196 {
197 if (res_need_init() && res_init() == -1) {
198 RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
199 return (-1);
200 }
201 return (res_nmkquery(&_nres, op, dname, class, type,
202 data, datalen,
203 newrr_in, buf, buflen));
204 }
205
206 #ifdef _LIBRESOLV
207 int
208 res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
209 if (res_need_init() && res_init() == -1) {
210 RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
211 return (-1);
212 }
213
214 return (res_nmkupdate(&_nres, rrecp_in, buf, buflen));
215 }
216 #endif
217
218 int
219 res_query(const char *name, /* domain name */
220 int class, int type, /* class and type of query */
221 u_char *answer, /* buffer to put answer */
222 int anslen) /* size of answer buffer */
223 {
224 if (res_need_init() && res_init() == -1) {
225 RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
226 return (-1);
227 }
228 return (res_nquery(&_nres, name, class, type, answer, anslen));
229 }
230
231 void
232 res_send_setqhook(res_send_qhook hook) {
233 _nres.qhook = hook;
234 }
235
236 void
237 res_send_setrhook(res_send_rhook hook) {
238 _nres.rhook = hook;
239 }
240
241 int
242 res_isourserver(const struct sockaddr_in *inp) {
243 return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));
244 }
245
246 int
247 res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
248 if (res_need_init() && res_init() == -1) {
249 /* errno should have been set by res_init() in this case. */
250 return (-1);
251 }
252
253 return (res_nsend(&_nres, buf, buflen, ans, anssiz));
254 }
255
256 #ifdef _LIBRESOLV
257 int
258 res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
259 u_char *ans, int anssiz)
260 {
261 if (res_need_init() && res_init() == -1) {
262 /* errno should have been set by res_init() in this case. */
263 return (-1);
264 }
265
266 return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));
267 }
268 #endif
269
270 void
271 res_close(void) {
272 res_nclose(&_nres);
273 }
274
275 #ifdef _LIBRESOLV
276 int
277 res_update(ns_updrec *rrecp_in) {
278 if (res_need_init() && res_init() == -1) {
279 RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
280 return (-1);
281 }
282
283 return (res_nupdate(&_nres, rrecp_in, NULL));
284 }
285 #endif
286
287 int
288 res_search(const char *name, /* domain name */
289 int class, int type, /* class and type of query */
290 u_char *answer, /* buffer to put answer */
291 int anslen) /* size of answer */
292 {
293 if (res_need_init() && res_init() == -1) {
294 RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
295 return (-1);
296 }
297
298 return (res_nsearch(&_nres, name, class, type, answer, anslen));
299 }
300
301 int
302 res_querydomain(const char *name,
303 const char *domain,
304 int class, int type, /* class and type of query */
305 u_char *answer, /* buffer to put answer */
306 int anslen) /* size of answer */
307 {
308 if (res_need_init() && res_init() == -1) {
309 RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
310 return (-1);
311 }
312
313 return (res_nquerydomain(&_nres, name, domain,
314 class, type,
315 answer, anslen));
316 }
317
318 int
319 res_opt(int a, u_char *b, int c, int d)
320 {
321 return res_nopt(&_nres, a, b, c, d);
322 }
323 #endif
324 #endif
325
326 const char *
327 hostalias(const char *name) {
328 return NULL;
329 }
330
331 #ifndef MOZILLA_NECKO_EXCLUDE_CODE
332 #ifdef ultrix
333 int
334 local_hostname_length(const char *hostname) {
335 int len_host, len_domain;
336
337 if (!*_nres.defdname)
338 res_init();
339 len_host = strlen(hostname);
340 len_domain = strlen(_nres.defdname);
341 if (len_host > len_domain &&
342 !strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&
343 hostname[len_host - len_domain - 1] == '.')
344 return (len_host - len_domain - 1);
345 return (0);
346 }
347 #endif /*ultrix*/
348 #endif

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