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1 /* $NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $ */
2
3 /*
4 * Copyright (c) 1985, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 /*
37 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38 *
39 * Permission to use, copy, modify, and distribute this software for any
40 * purpose with or without fee is hereby granted, provided that the above
41 * copyright notice and this permission notice appear in all copies, and that
42 * the name of Digital Equipment Corporation not be used in advertising or
43 * publicity pertaining to distribution of the document or software without
44 * specific, written prior permission.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 * SOFTWARE.
54 */
55
56 /*
57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
59 *
60 * Permission to use, copy, modify, and distribute this software for any
61 * purpose with or without fee is hereby granted, provided that the above
62 * copyright notice and this permission notice appear in all copies.
63 *
64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71 */
72
73 /*
74 * This version of this file is derived from Android 2.3 "Gingerbread",
75 * which contains uncredited changes by Android/Google developers. It has
76 * been modified in 2011 for use in the Android build of Mozilla Firefox by
77 * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
78 * and Steve Workman <sjhworkman@gmail.com>).
79 * These changes are offered under the same license as the original NetBSD
80 * file, whose copyright and license are unchanged above.
81 */
82
83 #define ANDROID_CHANGES 1
84 #define MOZILLE_NECKO_EXCLUDE_CODE 1
85
86 #include <sys/cdefs.h>
87 #if defined(LIBC_SCCS) && !defined(lint)
88 #ifdef notdef
89 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
90 static const char rcsid[] = "Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp";
91 #else
92 __RCSID("$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $");
93 #endif
94 #endif /* LIBC_SCCS and not lint */
95
96
97
98 #include <sys/types.h>
99 #include <sys/param.h>
100 #include <sys/socket.h>
101 #include <sys/time.h>
102
103 #include <netinet/in.h>
104 #include <arpa/inet.h>
105 #include "arpa_nameser.h"
106
107 #include <ctype.h>
108 #include <stdio.h>
109 #include <stdlib.h>
110 #include <string.h>
111 #include <unistd.h>
112 #include <netdb.h>
113
114 #ifdef ANDROID_CHANGES
115 #include <sys/system_properties.h>
116 #endif /* ANDROID_CHANGES */
117
118 #ifndef MIN
119 #define MIN(x,y) ((x)<(y)?(x):(y))
120 #endif
121
122 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
123 #ifdef ANDROID_CHANGES
124 #include "resolv_private.h"
125 #define MAX_DNS_PROPERTIES 8
126 #define DNS_PROP_NAME_PREFIX "net.dns"
127 #define DNS_CHANGE_PROP_NAME "net.dnschange"
128 #define DNS_SEARCH_PROP_NAME "net.dns.search"
129 const prop_info *dns_change_prop;
130 int dns_last_change_counter;
131 static int _get_dns_change_count();
132 #else
133 #include <resolv.h>
134 #endif
135
136 #include "res_private.h"
137
138 /* Options. Should all be left alone. */
139 #ifndef DEBUG
140 #define DEBUG
141 #endif
142
143 static void res_setoptions __P((res_state, const char *, const char *));
144
145 static const char sort_mask[] = "/&";
146 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
147 static u_int32_t net_mask __P((struct in_addr));
148
149 #if !defined(isascii) /* XXX - could be a function */
150 # define isascii(c) (!(c & 0200))
151 #endif
152
153 /*
154 * Resolver state default settings.
155 */
156
157 /*
158 * Set up default settings. If the configuration file exist, the values
159 * there will have precedence. Otherwise, the server address is set to
160 * INADDR_ANY and the default domain name comes from the gethostname().
161 *
162 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
163 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
164 * since it was noted that INADDR_ANY actually meant ``the first interface
165 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
166 * it had to be "up" in order for you to reach your own name server. It
167 * was later decided that since the recommended practice is to always
168 * install local static routes through 127.0.0.1 for all your network
169 * interfaces, that we could solve this problem without a code change.
170 *
171 * The configuration file should always be used, since it is the only way
172 * to specify a default domain. If you are running a server on your local
173 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
174 * in the configuration file.
175 *
176 * Return 0 if completes successfully, -1 on error
177 */
178 int
179 res_ninit(res_state statp) {
180 extern int __res_vinit(res_state, int);
181
182 return (__res_vinit(statp, 0));
183 }
184
185 #ifdef ANDROID_CHANGES
186 int load_domain_search_list(res_state statp) {
187 char propvalue[PROP_VALUE_MAX];
188 register char *cp, **pp;
189
190 if(__system_property_get(DNS_SEARCH_PROP_NAME, propvalue) >= 1) {
191 strlcpy(statp->defdname, propvalue, sizeof(statp->defdname));
192 if ((cp = strchr(statp->defdname, '\n')) != NULL)
193 *cp = '\0';
194 cp = statp->defdname;
195 pp = statp->dnsrch;
196 while ( pp < statp->dnsrch + MAXDNSRCH ) {
197 while (*cp == ' ' || *cp == '\t') /* skip leading white space */
198 cp++;
199 if (*cp == '\0') /* stop if nothing more */
200 break;
201 *pp++ = cp; /* record this search domain */
202 while (*cp) { /* zero-terminate it */
203 if (*cp == ' ' || *cp == '\t') {
204 *cp++ = '\0';
205 break;
206 }
207 cp++;
208 }
209 }
210 *pp = NULL; /* statp->dnsrch has MAXDNSRCH+1 items */
211 if (pp > statp->dnsrch)
212 return 1;
213 }
214 statp->defdname[0] = '\0'; /* no default domain name on Android */
215 statp->dnsrch[0] = NULL;
216 return 0;
217 }
218 #endif
219
220 /* This function has to be reachable by res_data.c but not publicly. */
221 int
222 __res_vinit(res_state statp, int preinit) {
223 register FILE *fp;
224 register char *cp, **pp;
225 register int n;
226 char buf[BUFSIZ];
227 int nserv = 0; /* number of nameserver records read from file */
228 int haveenv = 0;
229 int havesearch = 0;
230 int nsort = 0;
231 char *net;
232 int dots;
233 union res_sockaddr_union u[2];
234 #ifdef ANDROID_CHANGES
235 pid_t mypid = getpid();
236 int use_proc_props = 0;
237 int found_prop;
238 char dnsProperty[PROP_VALUE_MAX];
239 #endif
240
241 if (!preinit) {
242 statp->retrans = RES_TIMEOUT;
243 statp->retry = RES_DFLRETRY;
244 statp->options = RES_DEFAULT;
245 statp->id = res_randomid();
246 }
247
248 if ((statp->options & RES_INIT) != 0U)
249 res_ndestroy(statp);
250
251 memset(u, 0, sizeof(u));
252 #ifdef USELOOPBACK
253 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
254 #else
255 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
256 #endif
257 u[nserv].sin.sin_family = AF_INET;
258 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
259 #ifdef HAVE_SA_LEN
260 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
261 #endif
262 nserv++;
263 #ifdef HAS_INET6_STRUCTS
264 #ifdef USELOOPBACK
265 u[nserv].sin6.sin6_addr = in6addr_loopback;
266 #else
267 u[nserv].sin6.sin6_addr = in6addr_any;
268 #endif
269 u[nserv].sin6.sin6_family = AF_INET6;
270 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
271 #ifdef HAVE_SA_LEN
272 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
273 #endif
274 nserv++;
275 #endif
276 statp->nscount = 0;
277 statp->ndots = 1;
278 statp->pfcode = 0;
279 statp->_vcsock = -1;
280 statp->_flags = 0;
281 statp->qhook = NULL;
282 statp->rhook = NULL;
283 statp->_u._ext.nscount = 0;
284 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
285 if (statp->_u._ext.ext != NULL) {
286 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
287 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
288 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
289 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
290 }
291 statp->nsort = 0;
292 res_setservers(statp, u, nserv);
293
294 #if 0 /* IGNORE THE ENVIRONMENT */
295 /* Allow user to override the local domain definition */
296 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
297 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
298 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
299 haveenv++;
300
301 /*
302 * Set search list to be blank-separated strings
303 * from rest of env value. Permits users of LOCALDOMAIN
304 * to still have a search list, and anyone to set the
305 * one that they want to use as an individual (even more
306 * important now that the rfc1535 stuff restricts searches)
307 */
308 cp = statp->defdname;
309 pp = statp->dnsrch;
310 *pp++ = cp;
311 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
312 if (*cp == '\n') /* silly backwards compat */
313 break;
314 else if (*cp == ' ' || *cp == '\t') {
315 *cp = 0;
316 n = 1;
317 } else if (n) {
318 *pp++ = cp;
319 n = 0;
320 havesearch = 1;
321 }
322 }
323 /* null terminate last domain if there are excess */
324 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
325 cp++;
326 *cp = '\0';
327 *pp++ = 0;
328 }
329 if (nserv > 0)
330 statp->nscount = nserv;
331 #endif
332 #ifdef ANDROID_CHANGES /* READ FROM SYSTEM PROPERTIES */
333 dns_last_change_counter = _get_dns_change_count();
334
335 nserv = 0;
336 for(n = 1; n <= MAX_DNS_PROPERTIES && nserv < MAXNS; n++) {
337 char propname[PROP_NAME_MAX];
338 char propvalue[PROP_VALUE_MAX];
339
340 struct addrinfo hints, *ai;
341 char sbuf[NI_MAXSERV];
342 const size_t minsiz = sizeof(statp->_u._ext.ext->nsaddrs[0]);
343
344 /*
345 * Check first for process-specific properties, and if those don't
346 * exist, try the generic properties.
347 */
348 found_prop = 0;
349 if (n == 1 || use_proc_props) {
350 snprintf(propname, sizeof(propname), "%s%d.%d", DNS_PROP_NAME_PREFIX, n, mypid);
351 if(__system_property_get(propname, propvalue) < 1) {
352 if (use_proc_props) {
353 break;
354 }
355 } else {
356 found_prop = 1;
357 use_proc_props = 1;
358 }
359 }
360 if (!found_prop) {
361 snprintf(propname, sizeof(propname), "%s%d", DNS_PROP_NAME_PREFIX, n);
362 if(__system_property_get(propname, propvalue) < 1) {
363 break;
364 }
365 }
366
367 cp = propvalue;
368
369 while (*cp == ' ' || *cp == '\t')
370 cp++;
371 cp[strcspn(cp, ";# \t\n")] = '\0';
372 if ((*cp != '\0') && (*cp != '\n')) {
373 memset(&hints, 0, sizeof(hints));
374 hints.ai_family = PF_UNSPEC;
375 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
376 hints.ai_flags = AI_NUMERICHOST;
377 sprintf(sbuf, "%u", NAMESERVER_PORT);
378 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
379 (size_t)ai->ai_addrlen <= minsiz) {
380 if (statp->_u._ext.ext != NULL) {
381 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
382 ai->ai_addr, ai->ai_addrlen);
383 }
384 if ((size_t)ai->ai_addrlen <=
385 sizeof(statp->nsaddr_list[nserv])) {
386 memcpy(&statp->nsaddr_list[nserv],
387 ai->ai_addr, ai->ai_addrlen);
388 } else {
389 statp->nsaddr_list[nserv].sin_family = 0;
390 }
391 freeaddrinfo(ai);
392 nserv++;
393 }
394 }
395 }
396
397 /* Add the domain search list */
398 havesearch = load_domain_search_list(statp);
399 #else /* !ANDROID_CHANGES - IGNORE resolv.conf in Android */
400 #define MATCH(line, name) \
401 (!strncmp(line, name, sizeof(name) - 1) && \
402 (line[sizeof(name) - 1] == ' ' || \
403 line[sizeof(name) - 1] == '\t'))
404
405 nserv = 0;
406 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
407 /* read the config file */
408 while (fgets(buf, sizeof(buf), fp) != NULL) {
409 /* skip comments */
410 if (*buf == ';' || *buf == '#')
411 continue;
412 /* read default domain name */
413 if (MATCH(buf, "domain")) {
414 if (haveenv) /* skip if have from environ */
415 continue;
416 cp = buf + sizeof("domain") - 1;
417 while (*cp == ' ' || *cp == '\t')
418 cp++;
419 if ((*cp == '\0') || (*cp == '\n'))
420 continue;
421 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
422 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
423 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
424 *cp = '\0';
425 havesearch = 0;
426 continue;
427 }
428 /* set search list */
429 if (MATCH(buf, "search")) {
430 if (haveenv) /* skip if have from environ */
431 continue;
432 cp = buf + sizeof("search") - 1;
433 while (*cp == ' ' || *cp == '\t')
434 cp++;
435 if ((*cp == '\0') || (*cp == '\n'))
436 continue;
437 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
438 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
439 if ((cp = strchr(statp->defdname, '\n')) != NULL)
440 *cp = '\0';
441 /*
442 * Set search list to be blank-separated strings
443 * on rest of line.
444 */
445 cp = statp->defdname;
446 pp = statp->dnsrch;
447 *pp++ = cp;
448 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
449 if (*cp == ' ' || *cp == '\t') {
450 *cp = 0;
451 n = 1;
452 } else if (n) {
453 *pp++ = cp;
454 n = 0;
455 }
456 }
457 /* null terminate last domain if there are excess */
458 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
459 cp++;
460 *cp = '\0';
461 *pp++ = 0;
462 havesearch = 1;
463 continue;
464 }
465 /* read nameservers to query */
466 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
467 struct addrinfo hints, *ai;
468 char sbuf[NI_MAXSERV];
469 const size_t minsiz =
470 sizeof(statp->_u._ext.ext->nsaddrs[0]);
471
472 cp = buf + sizeof("nameserver") - 1;
473 while (*cp == ' ' || *cp == '\t')
474 cp++;
475 cp[strcspn(cp, ";# \t\n")] = '\0';
476 if ((*cp != '\0') && (*cp != '\n')) {
477 memset(&hints, 0, sizeof(hints));
478 hints.ai_family = PF_UNSPEC;
479 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
480 hints.ai_flags = AI_NUMERICHOST;
481 sprintf(sbuf, "%u", NAMESERVER_PORT);
482 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
483 ai->ai_addrlen <= minsiz) {
484 if (statp->_u._ext.ext != NULL) {
485 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
486 ai->ai_addr, ai->ai_addrlen);
487 }
488 if (ai->ai_addrlen <=
489 sizeof(statp->nsaddr_list[nserv])) {
490 memcpy(&statp->nsaddr_list[nserv],
491 ai->ai_addr, ai->ai_addrlen);
492 } else
493 statp->nsaddr_list[nserv].sin_family = 0;
494 freeaddrinfo(ai);
495 nserv++;
496 }
497 }
498 continue;
499 }
500 if (MATCH(buf, "sortlist")) {
501 struct in_addr a;
502
503 cp = buf + sizeof("sortlist") - 1;
504 while (nsort < MAXRESOLVSORT) {
505 while (*cp == ' ' || *cp == '\t')
506 cp++;
507 if (*cp == '\0' || *cp == '\n' || *cp == ';')
508 break;
509 net = cp;
510 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
511 isascii(*cp) && !isspace((unsigned char)*cp))
512 cp++;
513 n = *cp;
514 *cp = 0;
515 if (inet_aton(net, &a)) {
516 statp->sort_list[nsort].addr = a;
517 if (ISSORTMASK(n)) {
518 *cp++ = n;
519 net = cp;
520 while (*cp && *cp != ';' &&
521 isascii(*cp) &&
522 !isspace((unsigned char)*cp))
523 cp++;
524 n = *cp;
525 *cp = 0;
526 if (inet_aton(net, &a)) {
527 statp->sort_list[nsort].mask = a.s_addr;
528 } else {
529 statp->sort_list[nsort].mask =
530 net_mask(statp->sort_list[nsort].addr);
531 }
532 } else {
533 statp->sort_list[nsort].mask =
534 net_mask(statp->sort_list[nsort].addr);
535 }
536 nsort++;
537 }
538 *cp = n;
539 }
540 continue;
541 }
542 if (MATCH(buf, "options")) {
543 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
544 continue;
545 }
546 }
547 if (nserv > 0)
548 statp->nscount = nserv;
549 statp->nsort = nsort;
550 (void) fclose(fp);
551 }
552 #endif /* !ANDROID_CHANGES */
553 /*
554 * Last chance to get a nameserver. This should not normally
555 * be necessary
556 */
557 #ifdef NO_RESOLV_CONF
558 if(nserv == 0)
559 nserv = get_nameservers(statp);
560 #endif
561
562 if (statp->defdname[0] == 0 &&
563 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
564 (cp = strchr(buf, '.')) != NULL)
565 strcpy(statp->defdname, cp + 1);
566
567 /* find components of local domain that might be searched */
568 if (havesearch == 0) {
569 pp = statp->dnsrch;
570 *pp++ = statp->defdname;
571 *pp = NULL;
572
573 dots = 0;
574 for (cp = statp->defdname; *cp; cp++)
575 dots += (*cp == '.');
576
577 cp = statp->defdname;
578 while (pp < statp->dnsrch + MAXDFLSRCH) {
579 if (dots < LOCALDOMAINPARTS)
580 break;
581 cp = strchr(cp, '.') + 1; /* we know there is one */
582 *pp++ = cp;
583 dots--;
584 }
585 *pp = NULL;
586 #ifdef DEBUG
587 if (statp->options & RES_DEBUG) {
588 printf(";; res_init()... default dnsrch list:\n");
589 for (pp = statp->dnsrch; *pp; pp++)
590 printf(";;\t%s\n", *pp);
591 printf(";;\t..END..\n");
592 }
593 #endif
594 }
595
596 if ((cp = getenv("RES_OPTIONS")) != NULL)
597 res_setoptions(statp, cp, "env");
598 if (nserv > 0) {
599 statp->nscount = nserv;
600 statp->options |= RES_INIT;
601 }
602 return (0);
603 }
604
605 static void
606 res_setoptions(res_state statp, const char *options, const char *source)
607 {
608 const char *cp = options;
609 int i;
610 struct __res_state_ext *ext = statp->_u._ext.ext;
611
612 #ifdef DEBUG
613 if (statp->options & RES_DEBUG)
614 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
615 options, source);
616 #endif
617 while (*cp) {
618 /* skip leading and inner runs of spaces */
619 while (*cp == ' ' || *cp == '\t')
620 cp++;
621 /* search for and process individual options */
622 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
623 i = atoi(cp + sizeof("ndots:") - 1);
624 if (i <= RES_MAXNDOTS)
625 statp->ndots = i;
626 else
627 statp->ndots = RES_MAXNDOTS;
628 #ifdef DEBUG
629 if (statp->options & RES_DEBUG)
630 printf(";;\tndots=%d\n", statp->ndots);
631 #endif
632 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
633 i = atoi(cp + sizeof("timeout:") - 1);
634 if (i <= RES_MAXRETRANS)
635 statp->retrans = i;
636 else
637 statp->retrans = RES_MAXRETRANS;
638 #ifdef DEBUG
639 if (statp->options & RES_DEBUG)
640 printf(";;\ttimeout=%d\n", statp->retrans);
641 #endif
642 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
643 i = atoi(cp + sizeof("attempts:") - 1);
644 if (i <= RES_MAXRETRY)
645 statp->retry = i;
646 else
647 statp->retry = RES_MAXRETRY;
648 #ifdef DEBUG
649 if (statp->options & RES_DEBUG)
650 printf(";;\tattempts=%d\n", statp->retry);
651 #endif
652 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
653 #ifdef DEBUG
654 if (!(statp->options & RES_DEBUG)) {
655 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
656 options, source);
657 statp->options |= RES_DEBUG;
658 }
659 printf(";;\tdebug\n");
660 #endif
661 } else if (!strncmp(cp, "no_tld_query",
662 sizeof("no_tld_query") - 1) ||
663 !strncmp(cp, "no-tld-query",
664 sizeof("no-tld-query") - 1)) {
665 statp->options |= RES_NOTLDQUERY;
666 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
667 statp->options |= RES_USE_INET6;
668 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
669 statp->options |= RES_ROTATE;
670 } else if (!strncmp(cp, "no-check-names",
671 sizeof("no-check-names") - 1)) {
672 statp->options |= RES_NOCHECKNAME;
673 }
674 #ifdef RES_USE_EDNS0
675 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
676 statp->options |= RES_USE_EDNS0;
677 }
678 #endif
679 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
680 statp->options |= RES_USE_DNAME;
681 }
682 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
683 if (ext == NULL)
684 goto skip;
685 cp += sizeof("nibble:") - 1;
686 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
687 strncpy(ext->nsuffix, cp, (size_t)i);
688 ext->nsuffix[i] = '\0';
689 }
690 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
691 if (ext == NULL)
692 goto skip;
693 cp += sizeof("nibble2:") - 1;
694 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
695 strncpy(ext->nsuffix2, cp, (size_t)i);
696 ext->nsuffix2[i] = '\0';
697 }
698 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
699 cp += sizeof("v6revmode:") - 1;
700 /* "nibble" and "bitstring" used to be valid */
701 if (!strncmp(cp, "single", sizeof("single") - 1)) {
702 statp->options |= RES_NO_NIBBLE2;
703 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
704 statp->options &=
705 ~RES_NO_NIBBLE2;
706 }
707 }
708 else {
709 /* XXX - print a warning here? */
710 }
711 skip:
712 /* skip to next run of spaces */
713 while (*cp && *cp != ' ' && *cp != '\t')
714 cp++;
715 }
716 }
717
718 /* XXX - should really support CIDR which means explicit masks always. */
719 static u_int32_t
720 net_mask(in) /* XXX - should really use system's version of this */
721 struct in_addr in;
722 {
723 register u_int32_t i = ntohl(in.s_addr);
724
725 if (IN_CLASSA(i))
726 return (htonl(IN_CLASSA_NET));
727 else if (IN_CLASSB(i))
728 return (htonl(IN_CLASSB_NET));
729 return (htonl(IN_CLASSC_NET));
730 }
731
732 u_int
733 res_randomid(void) {
734 struct timeval now;
735
736 gettimeofday(&now, NULL);
737 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
738 }
739
740 /*
741 * This routine is for closing the socket if a virtual circuit is used and
742 * the program wants to close it. This provides support for endhostent()
743 * which expects to close the socket.
744 *
745 * This routine is not expected to be user visible.
746 */
747 void
748 res_nclose(res_state statp) {
749 int ns;
750
751 if (statp->_vcsock >= 0) {
752 (void) close(statp->_vcsock);
753 statp->_vcsock = -1;
754 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
755 }
756 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
757 if (statp->_u._ext.nssocks[ns] != -1) {
758 (void) close(statp->_u._ext.nssocks[ns]);
759 statp->_u._ext.nssocks[ns] = -1;
760 }
761 }
762 }
763
764 void
765 res_ndestroy(res_state statp) {
766 res_nclose(statp);
767 if (statp->_u._ext.ext != NULL)
768 free(statp->_u._ext.ext);
769 statp->options &= ~RES_INIT;
770 statp->_u._ext.ext = NULL;
771 }
772
773 const char *
774 res_get_nibblesuffix(res_state statp) {
775 if (statp->_u._ext.ext)
776 return (statp->_u._ext.ext->nsuffix);
777 return ("ip6.arpa");
778 }
779
780 const char *
781 res_get_nibblesuffix2(res_state statp) {
782 if (statp->_u._ext.ext)
783 return (statp->_u._ext.ext->nsuffix2);
784 return ("ip6.int");
785 }
786
787 void
788 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
789 int i, nserv;
790 size_t size;
791
792 /* close open servers */
793 res_nclose(statp);
794
795 /* cause rtt times to be forgotten */
796 statp->_u._ext.nscount = 0;
797
798 nserv = 0;
799 for (i = 0; i < cnt && nserv < MAXNS; i++) {
800 switch (set->sin.sin_family) {
801 case AF_INET:
802 size = sizeof(set->sin);
803 if (statp->_u._ext.ext)
804 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
805 &set->sin, size);
806 if (size <= sizeof(statp->nsaddr_list[nserv]))
807 memcpy(&statp->nsaddr_list[nserv],
808 &set->sin, size);
809 #ifdef notdef
810 else
811 statp->nsaddr_list[nserv].sin_family = 0;
812 #endif
813 nserv++;
814 break;
815
816 #ifdef HAS_INET6_STRUCTS
817 case AF_INET6:
818 size = sizeof(set->sin6);
819 if (statp->_u._ext.ext)
820 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
821 &set->sin6, size);
822 if (size <= sizeof(statp->nsaddr_list[nserv]))
823 memcpy(&statp->nsaddr_list[nserv],
824 &set->sin6, size);
825 else
826 statp->nsaddr_list[nserv].sin_family = 0;
827 nserv++;
828 break;
829 #endif
830
831 default:
832 break;
833 }
834 set++;
835 }
836 statp->nscount = nserv;
837
838 }
839
840 int
841 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
842 int i;
843 size_t size;
844 u_int16_t family;
845
846 for (i = 0; i < statp->nscount && i < cnt; i++) {
847 if (statp->_u._ext.ext)
848 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
849 else
850 family = statp->nsaddr_list[i].sin_family;
851
852 switch (family) {
853 case AF_INET:
854 size = sizeof(set->sin);
855 if (statp->_u._ext.ext)
856 memcpy(&set->sin,
857 &statp->_u._ext.ext->nsaddrs[i],
858 size);
859 else
860 memcpy(&set->sin, &statp->nsaddr_list[i],
861 size);
862 break;
863
864 #ifdef HAS_INET6_STRUCTS
865 case AF_INET6:
866 size = sizeof(set->sin6);
867 if (statp->_u._ext.ext)
868 memcpy(&set->sin6,
869 &statp->_u._ext.ext->nsaddrs[i],
870 size);
871 else
872 memcpy(&set->sin6, &statp->nsaddr_list[i],
873 size);
874 break;
875 #endif
876
877 default:
878 set->sin.sin_family = 0;
879 break;
880 }
881 set++;
882 }
883 return (statp->nscount);
884 }
885
886 #ifdef ANDROID_CHANGES
887 static int _get_dns_change_count()
888 {
889 if (dns_change_prop == NULL) {
890 dns_change_prop = __system_property_find(DNS_CHANGE_PROP_NAME);
891 }
892 if (dns_change_prop != NULL) {
893 char propvalue[PROP_VALUE_MAX];
894 if (__system_property_read(dns_change_prop, NULL, propvalue) >= 1) {
895 return atoi(propvalue);
896 }
897 }
898 return -1;
899 }
900
901 int res_get_dns_changed()
902 {
903 int change_count;
904
905 change_count = _get_dns_change_count();
906 if (change_count != dns_last_change_counter) {
907 if (change_count != -1) {
908 dns_last_change_counter = change_count;
909 }
910 return 1;
911 } else {
912 return 0;
913 }
914 }
915 #endif /* ANDROID_CHANGES */

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