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 #include <sys/cdefs.h>
74 #if defined(LIBC_SCCS) && !defined(lint)
75 #ifdef notdef
76 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
77 static const char rcsid[] = "Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp";
78 #else
79 __RCSID("$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $");
80 #endif
81 #endif /* LIBC_SCCS and not lint */
82
83
84
85 #include <sys/types.h>
86 #include <sys/param.h>
87 #include <sys/socket.h>
88 #include <sys/time.h>
89
90 #include <netinet/in.h>
91 #include <arpa/inet.h>
92 #include <arpa/nameser.h>
93
94 #include <ctype.h>
95 #include <stdio.h>
96 #include <stdlib.h>
97 #include <string.h>
98 #include <unistd.h>
99 #include <netdb.h>
100
101 #ifdef ANDROID_CHANGES
102 #include <errno.h>
103 #include <fcntl.h>
104 #endif /* ANDROID_CHANGES */
105
106 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
107 #ifdef ANDROID_CHANGES
108 #include "resolv_netid.h"
109 #include "resolv_private.h"
110 #else
111 #include <resolv.h>
112 #endif
113
114 #include "res_private.h"
115
116 /* Options. Should all be left alone. */
117 #ifndef DEBUG
118 #define DEBUG
119 #endif
120
121 static void res_setoptions __P((res_state, const char *, const char *));
122
123 #ifdef RESOLVSORT
124 static const char sort_mask[] = "/&";
125 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
126 static uint32_t net_mask(struct in_addr);
127 #endif
128
129 #if !defined(isascii) /* XXX - could be a function */
130 # define isascii(c) (!(c & 0200))
131 #endif
132
133 /*
134 * Resolver state default settings.
135 */
136
137 /*
138 * Set up default settings. If the configuration file exist, the values
139 * there will have precedence. Otherwise, the server address is set to
140 * INADDR_ANY and the default domain name comes from the gethostname().
141 *
142 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
143 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
144 * since it was noted that INADDR_ANY actually meant ``the first interface
145 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
146 * it had to be "up" in order for you to reach your own name server. It
147 * was later decided that since the recommended practice is to always
148 * install local static routes through 127.0.0.1 for all your network
149 * interfaces, that we could solve this problem without a code change.
150 *
151 * The configuration file should always be used, since it is the only way
152 * to specify a default domain. If you are running a server on your local
153 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
154 * in the configuration file.
155 *
156 * Return 0 if completes successfully, -1 on error
157 */
158 int
res_ninit(res_state statp)159 res_ninit(res_state statp) {
160 extern int __res_vinit(res_state, int);
161
162 return (__res_vinit(statp, 0));
163 }
164
165 /* This function has to be reachable by res_data.c but not publicly. */
166 int
__res_vinit(res_state statp,int preinit)167 __res_vinit(res_state statp, int preinit) {
168 #if !defined(__BIONIC__)
169 register FILE *fp;
170 #endif
171 register char *cp, **pp;
172 #if !defined(__BIONIC__)
173 register int n;
174 #endif
175 char buf[BUFSIZ];
176 int nserv = 0; /* number of nameserver records read from file */
177 #if !defined(__BIONIC__)
178 int haveenv = 0;
179 #endif
180 int havesearch = 0;
181 #ifdef RESOLVSORT
182 int nsort = 0;
183 #endif
184 #if !defined(__BIONIC__)
185 char *net;
186 #endif
187 int dots;
188 union res_sockaddr_union u[2];
189
190 if ((statp->options & RES_INIT) != 0U)
191 res_ndestroy(statp);
192
193 if (!preinit) {
194 statp->netid = NETID_UNSET;
195 statp->retrans = RES_TIMEOUT;
196 statp->retry = RES_DFLRETRY;
197 statp->options = RES_DEFAULT;
198 statp->id = res_randomid();
199 statp->_mark = MARK_UNSET;
200 }
201
202 memset(u, 0, sizeof(u));
203 #ifdef USELOOPBACK
204 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
205 #else
206 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
207 #endif
208 u[nserv].sin.sin_family = AF_INET;
209 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
210 #ifdef HAVE_SA_LEN
211 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
212 #endif
213 nserv++;
214 #ifdef HAS_INET6_STRUCTS
215 #ifdef USELOOPBACK
216 u[nserv].sin6.sin6_addr = in6addr_loopback;
217 #else
218 u[nserv].sin6.sin6_addr = in6addr_any;
219 #endif
220 u[nserv].sin6.sin6_family = AF_INET6;
221 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
222 #ifdef HAVE_SA_LEN
223 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
224 #endif
225 nserv++;
226 #endif
227 statp->nscount = 0;
228 statp->ndots = 1;
229 statp->pfcode = 0;
230 statp->_vcsock = -1;
231 statp->_flags = 0;
232 statp->qhook = NULL;
233 statp->rhook = NULL;
234 statp->_u._ext.nscount = 0;
235 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
236 if (statp->_u._ext.ext != NULL) {
237 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
238 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
239 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
240 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
241 }
242 statp->nsort = 0;
243 res_setservers(statp, u, nserv);
244
245 #if defined(__BIONIC__)
246 /* Ignore the environment. */
247 #else
248 /* Allow user to override the local domain definition */
249 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
250 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
251 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
252 haveenv++;
253
254 /*
255 * Set search list to be blank-separated strings
256 * from rest of env value. Permits users of LOCALDOMAIN
257 * to still have a search list, and anyone to set the
258 * one that they want to use as an individual (even more
259 * important now that the rfc1535 stuff restricts searches)
260 */
261 cp = statp->defdname;
262 pp = statp->dnsrch;
263 *pp++ = cp;
264 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
265 if (*cp == '\n') /* silly backwards compat */
266 break;
267 else if (*cp == ' ' || *cp == '\t') {
268 *cp = 0;
269 n = 1;
270 } else if (n) {
271 *pp++ = cp;
272 n = 0;
273 havesearch = 1;
274 }
275 }
276 /* null terminate last domain if there are excess */
277 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
278 cp++;
279 *cp = '\0';
280 *pp++ = 0;
281 }
282 if (nserv > 0)
283 statp->nscount = nserv;
284 #endif
285
286 #ifndef ANDROID_CHANGES /* !ANDROID_CHANGES - IGNORE resolv.conf in Android */
287 #define MATCH(line, name) \
288 (!strncmp(line, name, sizeof(name) - 1) && \
289 (line[sizeof(name) - 1] == ' ' || \
290 line[sizeof(name) - 1] == '\t'))
291
292 nserv = 0;
293 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
294 /* read the config file */
295 while (fgets(buf, sizeof(buf), fp) != NULL) {
296 /* skip comments */
297 if (*buf == ';' || *buf == '#')
298 continue;
299 /* read default domain name */
300 if (MATCH(buf, "domain")) {
301 if (haveenv) /* skip if have from environ */
302 continue;
303 cp = buf + sizeof("domain") - 1;
304 while (*cp == ' ' || *cp == '\t')
305 cp++;
306 if ((*cp == '\0') || (*cp == '\n'))
307 continue;
308 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
309 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
310 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
311 *cp = '\0';
312 havesearch = 0;
313 continue;
314 }
315 /* set search list */
316 if (MATCH(buf, "search")) {
317 if (haveenv) /* skip if have from environ */
318 continue;
319 cp = buf + sizeof("search") - 1;
320 while (*cp == ' ' || *cp == '\t')
321 cp++;
322 if ((*cp == '\0') || (*cp == '\n'))
323 continue;
324 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
325 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
326 if ((cp = strchr(statp->defdname, '\n')) != NULL)
327 *cp = '\0';
328 /*
329 * Set search list to be blank-separated strings
330 * on rest of line.
331 */
332 cp = statp->defdname;
333 pp = statp->dnsrch;
334 *pp++ = cp;
335 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
336 if (*cp == ' ' || *cp == '\t') {
337 *cp = 0;
338 n = 1;
339 } else if (n) {
340 *pp++ = cp;
341 n = 0;
342 }
343 }
344 /* null terminate last domain if there are excess */
345 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
346 cp++;
347 *cp = '\0';
348 *pp++ = 0;
349 havesearch = 1;
350 continue;
351 }
352 /* read nameservers to query */
353 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
354 struct addrinfo hints, *ai;
355 char sbuf[NI_MAXSERV];
356 const size_t minsiz =
357 sizeof(statp->_u._ext.ext->nsaddrs[0]);
358
359 cp = buf + sizeof("nameserver") - 1;
360 while (*cp == ' ' || *cp == '\t')
361 cp++;
362 cp[strcspn(cp, ";# \t\n")] = '\0';
363 if ((*cp != '\0') && (*cp != '\n')) {
364 memset(&hints, 0, sizeof(hints));
365 hints.ai_family = PF_UNSPEC;
366 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
367 hints.ai_flags = AI_NUMERICHOST;
368 sprintf(sbuf, "%u", NAMESERVER_PORT);
369 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
370 ai->ai_addrlen <= minsiz) {
371 if (statp->_u._ext.ext != NULL) {
372 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
373 ai->ai_addr, ai->ai_addrlen);
374 }
375 if (ai->ai_addrlen <=
376 sizeof(statp->nsaddr_list[nserv])) {
377 memcpy(&statp->nsaddr_list[nserv],
378 ai->ai_addr, ai->ai_addrlen);
379 } else
380 statp->nsaddr_list[nserv].sin_family = 0;
381 freeaddrinfo(ai);
382 nserv++;
383 }
384 }
385 continue;
386 }
387 if (MATCH(buf, "sortlist")) {
388 struct in_addr a;
389
390 cp = buf + sizeof("sortlist") - 1;
391 while (nsort < MAXRESOLVSORT) {
392 while (*cp == ' ' || *cp == '\t')
393 cp++;
394 if (*cp == '\0' || *cp == '\n' || *cp == ';')
395 break;
396 net = cp;
397 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
398 isascii(*cp) && !isspace((unsigned char)*cp))
399 cp++;
400 n = *cp;
401 *cp = 0;
402 if (inet_aton(net, &a)) {
403 statp->sort_list[nsort].addr = a;
404 if (ISSORTMASK(n)) {
405 *cp++ = n;
406 net = cp;
407 while (*cp && *cp != ';' &&
408 isascii(*cp) &&
409 !isspace((unsigned char)*cp))
410 cp++;
411 n = *cp;
412 *cp = 0;
413 if (inet_aton(net, &a)) {
414 statp->sort_list[nsort].mask = a.s_addr;
415 } else {
416 statp->sort_list[nsort].mask =
417 net_mask(statp->sort_list[nsort].addr);
418 }
419 } else {
420 statp->sort_list[nsort].mask =
421 net_mask(statp->sort_list[nsort].addr);
422 }
423 nsort++;
424 }
425 *cp = n;
426 }
427 continue;
428 }
429 if (MATCH(buf, "options")) {
430 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
431 continue;
432 }
433 }
434 if (nserv > 0)
435 statp->nscount = nserv;
436 statp->nsort = nsort;
437 (void) fclose(fp);
438 }
439 #endif /* !ANDROID_CHANGES */
440 /*
441 * Last chance to get a nameserver. This should not normally
442 * be necessary
443 */
444 #ifdef NO_RESOLV_CONF
445 if(nserv == 0)
446 nserv = get_nameservers(statp);
447 #endif
448
449 if (statp->defdname[0] == 0 &&
450 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
451 (cp = strchr(buf, '.')) != NULL)
452 strcpy(statp->defdname, cp + 1);
453
454 /* find components of local domain that might be searched */
455 if (havesearch == 0) {
456 pp = statp->dnsrch;
457 *pp++ = statp->defdname;
458 *pp = NULL;
459
460 dots = 0;
461 for (cp = statp->defdname; *cp; cp++)
462 dots += (*cp == '.');
463
464 cp = statp->defdname;
465 while (pp < statp->dnsrch + MAXDFLSRCH) {
466 if (dots < LOCALDOMAINPARTS)
467 break;
468 cp = strchr(cp, '.') + 1; /* we know there is one */
469 *pp++ = cp;
470 dots--;
471 }
472 *pp = NULL;
473 #ifdef DEBUG
474 if (statp->options & RES_DEBUG) {
475 printf(";; res_init()... default dnsrch list:\n");
476 for (pp = statp->dnsrch; *pp; pp++)
477 printf(";;\t%s\n", *pp);
478 printf(";;\t..END..\n");
479 }
480 #endif
481 }
482
483 if ((cp = getenv("RES_OPTIONS")) != NULL)
484 res_setoptions(statp, cp, "env");
485 if (nserv > 0) {
486 statp->nscount = nserv;
487 statp->options |= RES_INIT;
488 }
489 return (0);
490 }
491
492 static void
res_setoptions(res_state statp,const char * options,const char * source)493 res_setoptions(res_state statp, const char *options, const char *source)
494 {
495 const char *cp = options;
496 int i;
497 struct __res_state_ext *ext = statp->_u._ext.ext;
498
499 #ifdef DEBUG
500 if (statp->options & RES_DEBUG)
501 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
502 options, source);
503 #endif
504 while (*cp) {
505 /* skip leading and inner runs of spaces */
506 while (*cp == ' ' || *cp == '\t')
507 cp++;
508 /* search for and process individual options */
509 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
510 i = atoi(cp + sizeof("ndots:") - 1);
511 if (i <= RES_MAXNDOTS)
512 statp->ndots = i;
513 else
514 statp->ndots = RES_MAXNDOTS;
515 #ifdef DEBUG
516 if (statp->options & RES_DEBUG)
517 printf(";;\tndots=%d\n", statp->ndots);
518 #endif
519 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
520 i = atoi(cp + sizeof("timeout:") - 1);
521 if (i <= RES_MAXRETRANS)
522 statp->retrans = i;
523 else
524 statp->retrans = RES_MAXRETRANS;
525 #ifdef DEBUG
526 if (statp->options & RES_DEBUG)
527 printf(";;\ttimeout=%d\n", statp->retrans);
528 #endif
529 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
530 i = atoi(cp + sizeof("attempts:") - 1);
531 if (i <= RES_MAXRETRY)
532 statp->retry = i;
533 else
534 statp->retry = RES_MAXRETRY;
535 #ifdef DEBUG
536 if (statp->options & RES_DEBUG)
537 printf(";;\tattempts=%d\n", statp->retry);
538 #endif
539 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
540 #ifdef DEBUG
541 if (!(statp->options & RES_DEBUG)) {
542 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
543 options, source);
544 statp->options |= RES_DEBUG;
545 }
546 printf(";;\tdebug\n");
547 #endif
548 } else if (!strncmp(cp, "no_tld_query",
549 sizeof("no_tld_query") - 1) ||
550 !strncmp(cp, "no-tld-query",
551 sizeof("no-tld-query") - 1)) {
552 statp->options |= RES_NOTLDQUERY;
553 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
554 statp->options |= RES_USE_INET6;
555 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
556 statp->options |= RES_ROTATE;
557 } else if (!strncmp(cp, "no-check-names",
558 sizeof("no-check-names") - 1)) {
559 statp->options |= RES_NOCHECKNAME;
560 }
561 #ifdef RES_USE_EDNS0
562 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
563 statp->options |= RES_USE_EDNS0;
564 }
565 #endif
566 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
567 statp->options |= RES_USE_DNAME;
568 }
569 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
570 if (ext == NULL)
571 goto skip;
572 cp += sizeof("nibble:") - 1;
573 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
574 strncpy(ext->nsuffix, cp, (size_t)i);
575 ext->nsuffix[i] = '\0';
576 }
577 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
578 if (ext == NULL)
579 goto skip;
580 cp += sizeof("nibble2:") - 1;
581 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
582 strncpy(ext->nsuffix2, cp, (size_t)i);
583 ext->nsuffix2[i] = '\0';
584 }
585 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
586 cp += sizeof("v6revmode:") - 1;
587 /* "nibble" and "bitstring" used to be valid */
588 if (!strncmp(cp, "single", sizeof("single") - 1)) {
589 statp->options |= RES_NO_NIBBLE2;
590 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
591 statp->options &=
592 ~RES_NO_NIBBLE2;
593 }
594 }
595 else {
596 /* XXX - print a warning here? */
597 }
598 skip:
599 /* skip to next run of spaces */
600 while (*cp && *cp != ' ' && *cp != '\t')
601 cp++;
602 }
603 }
604
605 #ifdef RESOLVSORT
606 /* XXX - should really support CIDR which means explicit masks always. */
607 static uint32_t
net_mask(struct in_addr in)608 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
609 {
610 register uint32_t i = ntohl(in.s_addr);
611
612 if (IN_CLASSA(i))
613 return (htonl(IN_CLASSA_NET));
614 else if (IN_CLASSB(i))
615 return (htonl(IN_CLASSB_NET));
616 return (htonl(IN_CLASSC_NET));
617 }
618 #endif
619
620 /*%
621 * This routine is for closing the socket if a virtual circuit is used and
622 * the program wants to close it. This provides support for endhostent()
623 * which expects to close the socket.
624 *
625 * This routine is not expected to be user visible.
626 */
627 void
res_nclose(res_state statp)628 res_nclose(res_state statp)
629 {
630 int ns;
631
632 if (statp->_vcsock >= 0) {
633 (void) close(statp->_vcsock);
634 statp->_vcsock = -1;
635 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
636 }
637 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
638 if (statp->_u._ext.nssocks[ns] != -1) {
639 (void) close(statp->_u._ext.nssocks[ns]);
640 statp->_u._ext.nssocks[ns] = -1;
641 }
642 }
643 }
644
645 void
res_ndestroy(res_state statp)646 res_ndestroy(res_state statp)
647 {
648 res_nclose(statp);
649 if (statp->_u._ext.ext != NULL)
650 free(statp->_u._ext.ext);
651 statp->options &= ~RES_INIT;
652 statp->_u._ext.ext = NULL;
653 }
654
655 const char *
res_get_nibblesuffix(res_state statp)656 res_get_nibblesuffix(res_state statp)
657 {
658 if (statp->_u._ext.ext)
659 return (statp->_u._ext.ext->nsuffix);
660 return ("ip6.arpa");
661 }
662
663 const char *
res_get_nibblesuffix2(res_state statp)664 res_get_nibblesuffix2(res_state statp)
665 {
666 if (statp->_u._ext.ext)
667 return (statp->_u._ext.ext->nsuffix2);
668 return ("ip6.int");
669 }
670
671 void
res_setservers(res_state statp,const union res_sockaddr_union * set,int cnt)672 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
673 {
674 int i, nserv;
675 size_t size;
676
677 /* close open servers */
678 res_nclose(statp);
679
680 /* cause rtt times to be forgotten */
681 statp->_u._ext.nscount = 0;
682
683 nserv = 0;
684 for (i = 0; i < cnt && nserv < MAXNS; i++) {
685 switch (set->sin.sin_family) {
686 case AF_INET:
687 size = sizeof(set->sin);
688 if (statp->_u._ext.ext)
689 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
690 &set->sin, size);
691 if (size <= sizeof(statp->nsaddr_list[nserv]))
692 memcpy(&statp->nsaddr_list[nserv],
693 &set->sin, size);
694 else
695 statp->nsaddr_list[nserv].sin_family = 0;
696 nserv++;
697 break;
698
699 #ifdef HAS_INET6_STRUCTS
700 case AF_INET6:
701 size = sizeof(set->sin6);
702 if (statp->_u._ext.ext)
703 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
704 &set->sin6, size);
705 if (size <= sizeof(statp->nsaddr_list[nserv]))
706 memcpy(&statp->nsaddr_list[nserv],
707 &set->sin6, size);
708 else
709 statp->nsaddr_list[nserv].sin_family = 0;
710 nserv++;
711 break;
712 #endif
713
714 default:
715 break;
716 }
717 set++;
718 }
719 statp->nscount = nserv;
720
721 }
722
723 int
res_getservers(res_state statp,union res_sockaddr_union * set,int cnt)724 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
725 {
726 int i;
727 size_t size;
728 uint16_t family;
729
730 for (i = 0; i < statp->nscount && i < cnt; i++) {
731 if (statp->_u._ext.ext)
732 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
733 else
734 family = statp->nsaddr_list[i].sin_family;
735
736 switch (family) {
737 case AF_INET:
738 size = sizeof(set->sin);
739 if (statp->_u._ext.ext)
740 memcpy(&set->sin,
741 &statp->_u._ext.ext->nsaddrs[i],
742 size);
743 else
744 memcpy(&set->sin, &statp->nsaddr_list[i],
745 size);
746 break;
747
748 #ifdef HAS_INET6_STRUCTS
749 case AF_INET6:
750 size = sizeof(set->sin6);
751 if (statp->_u._ext.ext)
752 memcpy(&set->sin6,
753 &statp->_u._ext.ext->nsaddrs[i],
754 size);
755 else
756 memcpy(&set->sin6, &statp->nsaddr_list[i],
757 size);
758 break;
759 #endif
760
761 default:
762 set->sin.sin_family = 0;
763 break;
764 }
765 set++;
766 }
767 return (statp->nscount);
768 }
769
770 #ifdef ANDROID_CHANGES
res_setnetcontext(res_state statp,const struct android_net_context * netcontext)771 void res_setnetcontext(res_state statp, const struct android_net_context *netcontext)
772 {
773 if (statp != NULL) {
774 statp->netid = netcontext->dns_netid;
775 statp->_mark = netcontext->dns_mark;
776 statp->qhook = netcontext->qhook;
777 if (netcontext->flags & NET_CONTEXT_FLAG_USE_EDNS) {
778 statp->options |= RES_USE_EDNS0 | RES_USE_DNSSEC;
779 }
780 }
781 }
782
783 #endif /* ANDROID_CHANGES */
784