blob: 06d445214fdebaf839f0a53557f611a29dc1e7dd [file] [log] [blame]
Bernie Innocenti318ed2d2018-08-30 04:05:20 +09001/* $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
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090073#include <sys/param.h>
74#include <sys/socket.h>
75#include <sys/time.h>
Bernie Innocenti8ad893f2018-08-31 14:09:46 +090076#include <sys/types.h>
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090077
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090078#include <arpa/inet.h>
79#include <arpa/nameser.h>
Bernie Innocenti8ad893f2018-08-31 14:09:46 +090080#include <netinet/in.h>
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090081
82#include <ctype.h>
Bernie Innocentif33a63f2018-08-30 12:04:03 +090083#include <errno.h>
84#include <fcntl.h>
Bernie Innocenti8ad893f2018-08-31 14:09:46 +090085#include <netdb.h>
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090086#include <stdio.h>
87#include <stdlib.h>
88#include <string.h>
89#include <unistd.h>
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090090
Bernie Innocentiac18b122018-10-01 23:10:18 +090091#include "netd_resolv/resolv.h"
92#include "res_state_ext.h"
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090093#include "resolv_private.h"
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090094
Bernie Innocenti318ed2d2018-08-30 04:05:20 +090095/* Options. Should all be left alone. */
96#ifndef DEBUG
97#define DEBUG
98#endif
99
Bernie Innocentif33a63f2018-08-30 12:04:03 +0900100static void res_setoptions(res_state, const char*, const char*);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900101
102/*
103 * Resolver state default settings.
104 */
105
106/*
107 * Set up default settings. If the configuration file exist, the values
108 * there will have precedence. Otherwise, the server address is set to
109 * INADDR_ANY and the default domain name comes from the gethostname().
110 *
111 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
112 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
113 * since it was noted that INADDR_ANY actually meant ``the first interface
114 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
115 * it had to be "up" in order for you to reach your own name server. It
116 * was later decided that since the recommended practice is to always
117 * install local static routes through 127.0.0.1 for all your network
118 * interfaces, that we could solve this problem without a code change.
119 *
120 * The configuration file should always be used, since it is the only way
121 * to specify a default domain. If you are running a server on your local
122 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
123 * in the configuration file.
124 *
125 * Return 0 if completes successfully, -1 on error
126 */
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900127int res_ninit(res_state statp) {
Bernie Innocenti2e8540b2018-09-26 11:52:04 +0900128 return res_vinit(statp, 0);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900129}
130
131/* This function has to be reachable by res_data.c but not publicly. */
Bernie Innocenti2e8540b2018-09-26 11:52:04 +0900132int res_vinit(res_state statp, int preinit) {
Bernie Innocenti9c575932018-09-07 21:10:25 +0900133 char *cp, **pp;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900134 char buf[BUFSIZ];
135 int nserv = 0; /* number of nameserver records read from file */
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900136 int havesearch = 0;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900137 int dots;
nuccachenb980f2f2018-10-23 17:10:58 +0800138 sockaddr_union u[2];
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900139
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900140 if ((statp->options & RES_INIT) != 0U) res_ndestroy(statp);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900141
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900142 if (!preinit) {
143 statp->netid = NETID_UNSET;
144 statp->retrans = RES_TIMEOUT;
145 statp->retry = RES_DFLRETRY;
146 statp->options = RES_DEFAULT;
147 statp->id = res_randomid();
148 statp->_mark = MARK_UNSET;
149 }
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900150
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900151 memset(u, 0, sizeof(u));
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900152 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900153 u[nserv].sin.sin_family = AF_INET;
154 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900155 nserv++;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900156 statp->nscount = 0;
157 statp->ndots = 1;
158 statp->pfcode = 0;
159 statp->_vcsock = -1;
160 statp->_flags = 0;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900161 statp->_u._ext.nscount = 0;
Bernie Innocentiac18b122018-10-01 23:10:18 +0900162 statp->_u._ext.ext = (res_state_ext*) malloc(sizeof(*statp->_u._ext.ext));
Mike Yub601ff72018-11-01 20:07:00 +0800163 statp->use_local_nameserver = false;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900164 if (statp->_u._ext.ext != NULL) {
165 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
166 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
167 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
168 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
169 }
170 statp->nsort = 0;
171 res_setservers(statp, u, nserv);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900172
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900173 if (statp->defdname[0] == 0 && gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
174 (cp = strchr(buf, '.')) != NULL)
175 strcpy(statp->defdname, cp + 1);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900176
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900177 /* find components of local domain that might be searched */
178 if (havesearch == 0) {
179 pp = statp->dnsrch;
180 *pp++ = statp->defdname;
181 *pp = NULL;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900182
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900183 dots = 0;
184 for (cp = statp->defdname; *cp; cp++) dots += (*cp == '.');
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900185
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900186 cp = statp->defdname;
187 while (pp < statp->dnsrch + MAXDFLSRCH) {
188 if (dots < LOCALDOMAINPARTS) break;
189 cp = strchr(cp, '.') + 1; /* we know there is one */
190 *pp++ = cp;
191 dots--;
192 }
193 *pp = NULL;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900194#ifdef DEBUG
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900195 if (statp->options & RES_DEBUG) {
196 printf(";; res_init()... default dnsrch list:\n");
197 for (pp = statp->dnsrch; *pp; pp++) printf(";;\t%s\n", *pp);
198 printf(";;\t..END..\n");
199 }
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900200#endif
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900201 }
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900202
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900203 if ((cp = getenv("RES_OPTIONS")) != NULL) res_setoptions(statp, cp, "env");
204 if (nserv > 0) {
205 statp->nscount = nserv;
206 statp->options |= RES_INIT;
207 }
208 return (0);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900209}
210
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900211static void res_setoptions(res_state statp, const char* options, const char* source) {
212 const char* cp = options;
213 int i;
Bernie Innocentiac18b122018-10-01 23:10:18 +0900214 res_state_ext* ext = statp->_u._ext.ext;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900215
216#ifdef DEBUG
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900217 if (statp->options & RES_DEBUG)
218 printf(";; res_setoptions(\"%s\", \"%s\")...\n", options, source);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900219#endif
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900220 while (*cp) {
221 /* skip leading and inner runs of spaces */
222 while (*cp == ' ' || *cp == '\t') cp++;
223 /* search for and process individual options */
224 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
225 i = atoi(cp + sizeof("ndots:") - 1);
226 if (i <= RES_MAXNDOTS)
227 statp->ndots = i;
228 else
229 statp->ndots = RES_MAXNDOTS;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900230#ifdef DEBUG
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900231 if (statp->options & RES_DEBUG) printf(";;\tndots=%d\n", statp->ndots);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900232#endif
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900233 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
234 i = atoi(cp + sizeof("timeout:") - 1);
235 if (i <= RES_MAXRETRANS)
236 statp->retrans = i;
237 else
238 statp->retrans = RES_MAXRETRANS;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900239#ifdef DEBUG
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900240 if (statp->options & RES_DEBUG) printf(";;\ttimeout=%d\n", statp->retrans);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900241#endif
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900242 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)) {
243 i = atoi(cp + sizeof("attempts:") - 1);
244 if (i <= RES_MAXRETRY)
245 statp->retry = i;
246 else
247 statp->retry = RES_MAXRETRY;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900248#ifdef DEBUG
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900249 if (statp->options & RES_DEBUG) printf(";;\tattempts=%d\n", statp->retry);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900250#endif
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900251 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900252#ifdef DEBUG
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900253 if (!(statp->options & RES_DEBUG)) {
254 printf(";; res_setoptions(\"%s\", \"%s\")..\n", options, source);
255 statp->options |= RES_DEBUG;
256 }
257 printf(";;\tdebug\n");
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900258#endif
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900259 } else if (!strncmp(cp, "no_tld_query", sizeof("no_tld_query") - 1) ||
260 !strncmp(cp, "no-tld-query", sizeof("no-tld-query") - 1)) {
261 statp->options |= RES_NOTLDQUERY;
262 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
263 statp->options |= RES_USE_INET6;
264 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
265 statp->options |= RES_ROTATE;
266 } else if (!strncmp(cp, "no-check-names", sizeof("no-check-names") - 1)) {
267 statp->options |= RES_NOCHECKNAME;
268 }
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900269 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
270 statp->options |= RES_USE_EDNS0;
271 }
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900272 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
273 statp->options |= RES_USE_DNAME;
274 } else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
275 if (ext == NULL) goto skip;
276 cp += sizeof("nibble:") - 1;
277 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
278 strncpy(ext->nsuffix, cp, (size_t) i);
279 ext->nsuffix[i] = '\0';
280 } else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
281 if (ext == NULL) goto skip;
282 cp += sizeof("nibble2:") - 1;
283 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
284 strncpy(ext->nsuffix2, cp, (size_t) i);
285 ext->nsuffix2[i] = '\0';
286 } else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
287 cp += sizeof("v6revmode:") - 1;
288 /* "nibble" and "bitstring" used to be valid */
289 if (!strncmp(cp, "single", sizeof("single") - 1)) {
290 statp->options |= RES_NO_NIBBLE2;
291 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
292 statp->options &= ~RES_NO_NIBBLE2;
293 }
294 } else {
295 /* XXX - print a warning here? */
296 }
297 skip:
298 /* skip to next run of spaces */
299 while (*cp && *cp != ' ' && *cp != '\t') cp++;
300 }
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900301}
302
Bernie Innocentif33a63f2018-08-30 12:04:03 +0900303/*
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900304 * This routine is for closing the socket if a virtual circuit is used and
305 * the program wants to close it. This provides support for endhostent()
306 * which expects to close the socket.
307 *
308 * This routine is not expected to be user visible.
309 */
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900310void res_nclose(res_state statp) {
311 int ns;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900312
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900313 if (statp->_vcsock >= 0) {
314 (void) close(statp->_vcsock);
315 statp->_vcsock = -1;
316 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
317 }
318 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
319 if (statp->_u._ext.nssocks[ns] != -1) {
320 (void) close(statp->_u._ext.nssocks[ns]);
321 statp->_u._ext.nssocks[ns] = -1;
322 }
323 }
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900324}
325
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900326void res_ndestroy(res_state statp) {
327 res_nclose(statp);
328 if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext);
329 statp->options &= ~RES_INIT;
330 statp->_u._ext.ext = NULL;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900331}
332
nuccachenb980f2f2018-10-23 17:10:58 +0800333void res_setservers(res_state statp, const sockaddr_union* set, int cnt) {
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900334 int i, nserv;
335 size_t size;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900336
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900337 /* close open servers */
338 res_nclose(statp);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900339
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900340 /* cause rtt times to be forgotten */
341 statp->_u._ext.nscount = 0;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900342
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900343 nserv = 0;
344 for (i = 0; i < cnt && nserv < MAXNS; i++) {
345 switch (set->sin.sin_family) {
346 case AF_INET:
347 size = sizeof(set->sin);
348 if (statp->_u._ext.ext)
349 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin, size);
350 if (size <= sizeof(statp->nsaddr_list[nserv]))
351 memcpy(&statp->nsaddr_list[nserv], &set->sin, size);
352 else
353 statp->nsaddr_list[nserv].sin_family = 0;
354 nserv++;
355 break;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900356
357#ifdef HAS_INET6_STRUCTS
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900358 case AF_INET6:
359 size = sizeof(set->sin6);
360 if (statp->_u._ext.ext)
361 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin6, size);
362 if (size <= sizeof(statp->nsaddr_list[nserv]))
363 memcpy(&statp->nsaddr_list[nserv], &set->sin6, size);
364 else
365 statp->nsaddr_list[nserv].sin_family = 0;
366 nserv++;
367 break;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900368#endif
369
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900370 default:
371 break;
372 }
373 set++;
374 }
375 statp->nscount = nserv;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900376}
377
nuccachenb980f2f2018-10-23 17:10:58 +0800378int res_getservers(res_state statp, sockaddr_union* set, int cnt) {
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900379 int i;
380 size_t size;
381 uint16_t family;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900382
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900383 for (i = 0; i < statp->nscount && i < cnt; i++) {
384 if (statp->_u._ext.ext)
385 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
386 else
387 family = statp->nsaddr_list[i].sin_family;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900388
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900389 switch (family) {
390 case AF_INET:
391 size = sizeof(set->sin);
392 if (statp->_u._ext.ext)
393 memcpy(&set->sin, &statp->_u._ext.ext->nsaddrs[i], size);
394 else
395 memcpy(&set->sin, &statp->nsaddr_list[i], size);
396 break;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900397
398#ifdef HAS_INET6_STRUCTS
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900399 case AF_INET6:
400 size = sizeof(set->sin6);
401 if (statp->_u._ext.ext)
402 memcpy(&set->sin6, &statp->_u._ext.ext->nsaddrs[i], size);
403 else
404 memcpy(&set->sin6, &statp->nsaddr_list[i], size);
405 break;
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900406#endif
407
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900408 default:
409 set->sin.sin_family = 0;
410 break;
411 }
412 set++;
413 }
414 return (statp->nscount);
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900415}
416
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900417void res_setnetcontext(res_state statp, const struct android_net_context* netcontext) {
418 if (statp != NULL) {
419 statp->netid = netcontext->dns_netid;
420 statp->_mark = netcontext->dns_mark;
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900421 if (netcontext->flags & NET_CONTEXT_FLAG_USE_EDNS) {
422 statp->options |= RES_USE_EDNS0 | RES_USE_DNSSEC;
423 }
Mike Yub601ff72018-11-01 20:07:00 +0800424 if (netcontext->flags & NET_CONTEXT_FLAG_USE_LOCAL_NAMESERVERS) {
425 statp->use_local_nameserver = true;
426 }
Bernie Innocenti8ad893f2018-08-31 14:09:46 +0900427 }
Bernie Innocenti318ed2d2018-08-30 04:05:20 +0900428}