blob: de10396a7bd3fef52bcbd69310c3ce13c4651575 [file] [log] [blame]
Bernie Innocenti55864192018-08-30 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 Innocenti55864192018-08-30 04:05:20 +090073#include <sys/param.h>
74#include <sys/socket.h>
75#include <sys/time.h>
Bernie Innocentif12d5bb2018-08-31 14:09:46 +090076#include <sys/types.h>
Bernie Innocenti55864192018-08-30 04:05:20 +090077
Bernie Innocenti55864192018-08-30 04:05:20 +090078#include <arpa/inet.h>
79#include <arpa/nameser.h>
Bernie Innocentif12d5bb2018-08-31 14:09:46 +090080#include <netinet/in.h>
Bernie Innocenti55864192018-08-30 04:05:20 +090081
82#include <ctype.h>
Bernie Innocenti2fd418e2018-08-30 12:04:03 +090083#include <errno.h>
84#include <fcntl.h>
Bernie Innocentif12d5bb2018-08-31 14:09:46 +090085#include <netdb.h>
Bernie Innocenti55864192018-08-30 04:05:20 +090086#include <stdio.h>
87#include <stdlib.h>
88#include <string.h>
89#include <unistd.h>
Bernie Innocenti55864192018-08-30 04:05:20 +090090
Bernie Innocenti55864192018-08-30 04:05:20 +090091/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
Bernie Innocenti55864192018-08-30 04:05:20 +090092#include "resolv_netid.h"
93#include "resolv_private.h"
Bernie Innocenti55864192018-08-30 04:05:20 +090094
95#include "res_private.h"
96
97/* Options. Should all be left alone. */
98#ifndef DEBUG
99#define DEBUG
100#endif
101
Bernie Innocenti2fd418e2018-08-30 12:04:03 +0900102static void res_setoptions(res_state, const char*, const char*);
Bernie Innocenti55864192018-08-30 04:05:20 +0900103
104/*
105 * Resolver state default settings.
106 */
107
108/*
109 * Set up default settings. If the configuration file exist, the values
110 * there will have precedence. Otherwise, the server address is set to
111 * INADDR_ANY and the default domain name comes from the gethostname().
112 *
113 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
114 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
115 * since it was noted that INADDR_ANY actually meant ``the first interface
116 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
117 * it had to be "up" in order for you to reach your own name server. It
118 * was later decided that since the recommended practice is to always
119 * install local static routes through 127.0.0.1 for all your network
120 * interfaces, that we could solve this problem without a code change.
121 *
122 * The configuration file should always be used, since it is the only way
123 * to specify a default domain. If you are running a server on your local
124 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
125 * in the configuration file.
126 *
127 * Return 0 if completes successfully, -1 on error
128 */
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900129int res_ninit(res_state statp) {
130 extern int __res_vinit(res_state, int);
Bernie Innocenti55864192018-08-30 04:05:20 +0900131
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900132 return (__res_vinit(statp, 0));
Bernie Innocenti55864192018-08-30 04:05:20 +0900133}
134
135/* This function has to be reachable by res_data.c but not publicly. */
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900136int __res_vinit(res_state statp, int preinit) {
Bernie Innocenti55864192018-08-30 04:05:20 +0900137#if !defined(__BIONIC__)
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900138 register FILE* fp;
Bernie Innocenti55864192018-08-30 04:05:20 +0900139#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900140 register char *cp, **pp;
Bernie Innocenti55864192018-08-30 04:05:20 +0900141#if !defined(__BIONIC__)
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900142 register int n;
Bernie Innocenti55864192018-08-30 04:05:20 +0900143#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900144 char buf[BUFSIZ];
145 int nserv = 0; /* number of nameserver records read from file */
Bernie Innocenti55864192018-08-30 04:05:20 +0900146#if !defined(__BIONIC__)
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900147 int haveenv = 0;
Bernie Innocenti55864192018-08-30 04:05:20 +0900148#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900149 int havesearch = 0;
Bernie Innocenti55864192018-08-30 04:05:20 +0900150#if !defined(__BIONIC__)
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900151 char* net;
Bernie Innocenti55864192018-08-30 04:05:20 +0900152#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900153 int dots;
154 union res_sockaddr_union u[2];
Bernie Innocenti55864192018-08-30 04:05:20 +0900155
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900156 if ((statp->options & RES_INIT) != 0U) res_ndestroy(statp);
Bernie Innocenti55864192018-08-30 04:05:20 +0900157
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900158 if (!preinit) {
159 statp->netid = NETID_UNSET;
160 statp->retrans = RES_TIMEOUT;
161 statp->retry = RES_DFLRETRY;
162 statp->options = RES_DEFAULT;
163 statp->id = res_randomid();
164 statp->_mark = MARK_UNSET;
165 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900166
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900167 memset(u, 0, sizeof(u));
Bernie Innocenti55864192018-08-30 04:05:20 +0900168#ifdef USELOOPBACK
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900169 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
Bernie Innocenti55864192018-08-30 04:05:20 +0900170#else
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900171 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
Bernie Innocenti55864192018-08-30 04:05:20 +0900172#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900173 u[nserv].sin.sin_family = AF_INET;
174 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
Bernie Innocenti55864192018-08-30 04:05:20 +0900175#ifdef HAVE_SA_LEN
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900176 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
Bernie Innocenti55864192018-08-30 04:05:20 +0900177#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900178 nserv++;
Bernie Innocenti55864192018-08-30 04:05:20 +0900179#ifdef HAS_INET6_STRUCTS
180#ifdef USELOOPBACK
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900181 u[nserv].sin6.sin6_addr = in6addr_loopback;
Bernie Innocenti55864192018-08-30 04:05:20 +0900182#else
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900183 u[nserv].sin6.sin6_addr = in6addr_any;
Bernie Innocenti55864192018-08-30 04:05:20 +0900184#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900185 u[nserv].sin6.sin6_family = AF_INET6;
186 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
Bernie Innocenti55864192018-08-30 04:05:20 +0900187#ifdef HAVE_SA_LEN
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900188 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
Bernie Innocenti55864192018-08-30 04:05:20 +0900189#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900190 nserv++;
Bernie Innocenti55864192018-08-30 04:05:20 +0900191#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900192 statp->nscount = 0;
193 statp->ndots = 1;
194 statp->pfcode = 0;
195 statp->_vcsock = -1;
196 statp->_flags = 0;
197 statp->qhook = NULL;
198 statp->rhook = NULL;
199 statp->_u._ext.nscount = 0;
200 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
201 if (statp->_u._ext.ext != NULL) {
202 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
203 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
204 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
205 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
206 }
207 statp->nsort = 0;
208 res_setservers(statp, u, nserv);
Bernie Innocenti55864192018-08-30 04:05:20 +0900209
210#if defined(__BIONIC__)
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900211 /* Ignore the environment. */
Bernie Innocenti55864192018-08-30 04:05:20 +0900212#else
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900213 /* Allow user to override the local domain definition */
214 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
215 (void) strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
216 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
217 haveenv++;
Bernie Innocenti55864192018-08-30 04:05:20 +0900218
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900219 /*
220 * Set search list to be blank-separated strings
221 * from rest of env value. Permits users of LOCALDOMAIN
222 * to still have a search list, and anyone to set the
223 * one that they want to use as an individual (even more
224 * important now that the rfc1535 stuff restricts searches)
225 */
226 cp = statp->defdname;
227 pp = statp->dnsrch;
228 *pp++ = cp;
229 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
230 if (*cp == '\n') /* silly backwards compat */
231 break;
232 else if (*cp == ' ' || *cp == '\t') {
233 *cp = 0;
234 n = 1;
235 } else if (n) {
236 *pp++ = cp;
237 n = 0;
238 havesearch = 1;
239 }
240 }
241 /* null terminate last domain if there are excess */
242 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n') cp++;
243 *cp = '\0';
244 *pp++ = 0;
245 }
246 if (nserv > 0) statp->nscount = nserv;
Bernie Innocenti55864192018-08-30 04:05:20 +0900247#endif
248
Bernie Innocenti55864192018-08-30 04:05:20 +0900249/*
250 * Last chance to get a nameserver. This should not normally
251 * be necessary
252 */
253#ifdef NO_RESOLV_CONF
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900254 if (nserv == 0) nserv = get_nameservers(statp);
Bernie Innocenti55864192018-08-30 04:05:20 +0900255#endif
256
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900257 if (statp->defdname[0] == 0 && gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
258 (cp = strchr(buf, '.')) != NULL)
259 strcpy(statp->defdname, cp + 1);
Bernie Innocenti55864192018-08-30 04:05:20 +0900260
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900261 /* find components of local domain that might be searched */
262 if (havesearch == 0) {
263 pp = statp->dnsrch;
264 *pp++ = statp->defdname;
265 *pp = NULL;
Bernie Innocenti55864192018-08-30 04:05:20 +0900266
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900267 dots = 0;
268 for (cp = statp->defdname; *cp; cp++) dots += (*cp == '.');
Bernie Innocenti55864192018-08-30 04:05:20 +0900269
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900270 cp = statp->defdname;
271 while (pp < statp->dnsrch + MAXDFLSRCH) {
272 if (dots < LOCALDOMAINPARTS) break;
273 cp = strchr(cp, '.') + 1; /* we know there is one */
274 *pp++ = cp;
275 dots--;
276 }
277 *pp = NULL;
Bernie Innocenti55864192018-08-30 04:05:20 +0900278#ifdef DEBUG
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900279 if (statp->options & RES_DEBUG) {
280 printf(";; res_init()... default dnsrch list:\n");
281 for (pp = statp->dnsrch; *pp; pp++) printf(";;\t%s\n", *pp);
282 printf(";;\t..END..\n");
283 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900284#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900285 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900286
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900287 if ((cp = getenv("RES_OPTIONS")) != NULL) res_setoptions(statp, cp, "env");
288 if (nserv > 0) {
289 statp->nscount = nserv;
290 statp->options |= RES_INIT;
291 }
292 return (0);
Bernie Innocenti55864192018-08-30 04:05:20 +0900293}
294
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900295static void res_setoptions(res_state statp, const char* options, const char* source) {
296 const char* cp = options;
297 int i;
298 struct __res_state_ext* ext = statp->_u._ext.ext;
Bernie Innocenti55864192018-08-30 04:05:20 +0900299
300#ifdef DEBUG
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900301 if (statp->options & RES_DEBUG)
302 printf(";; res_setoptions(\"%s\", \"%s\")...\n", options, source);
Bernie Innocenti55864192018-08-30 04:05:20 +0900303#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900304 while (*cp) {
305 /* skip leading and inner runs of spaces */
306 while (*cp == ' ' || *cp == '\t') cp++;
307 /* search for and process individual options */
308 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
309 i = atoi(cp + sizeof("ndots:") - 1);
310 if (i <= RES_MAXNDOTS)
311 statp->ndots = i;
312 else
313 statp->ndots = RES_MAXNDOTS;
Bernie Innocenti55864192018-08-30 04:05:20 +0900314#ifdef DEBUG
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900315 if (statp->options & RES_DEBUG) printf(";;\tndots=%d\n", statp->ndots);
Bernie Innocenti55864192018-08-30 04:05:20 +0900316#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900317 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
318 i = atoi(cp + sizeof("timeout:") - 1);
319 if (i <= RES_MAXRETRANS)
320 statp->retrans = i;
321 else
322 statp->retrans = RES_MAXRETRANS;
Bernie Innocenti55864192018-08-30 04:05:20 +0900323#ifdef DEBUG
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900324 if (statp->options & RES_DEBUG) printf(";;\ttimeout=%d\n", statp->retrans);
Bernie Innocenti55864192018-08-30 04:05:20 +0900325#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900326 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)) {
327 i = atoi(cp + sizeof("attempts:") - 1);
328 if (i <= RES_MAXRETRY)
329 statp->retry = i;
330 else
331 statp->retry = RES_MAXRETRY;
Bernie Innocenti55864192018-08-30 04:05:20 +0900332#ifdef DEBUG
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900333 if (statp->options & RES_DEBUG) printf(";;\tattempts=%d\n", statp->retry);
Bernie Innocenti55864192018-08-30 04:05:20 +0900334#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900335 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
Bernie Innocenti55864192018-08-30 04:05:20 +0900336#ifdef DEBUG
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900337 if (!(statp->options & RES_DEBUG)) {
338 printf(";; res_setoptions(\"%s\", \"%s\")..\n", options, source);
339 statp->options |= RES_DEBUG;
340 }
341 printf(";;\tdebug\n");
Bernie Innocenti55864192018-08-30 04:05:20 +0900342#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900343 } else if (!strncmp(cp, "no_tld_query", sizeof("no_tld_query") - 1) ||
344 !strncmp(cp, "no-tld-query", sizeof("no-tld-query") - 1)) {
345 statp->options |= RES_NOTLDQUERY;
346 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
347 statp->options |= RES_USE_INET6;
348 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
349 statp->options |= RES_ROTATE;
350 } else if (!strncmp(cp, "no-check-names", sizeof("no-check-names") - 1)) {
351 statp->options |= RES_NOCHECKNAME;
352 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900353#ifdef RES_USE_EDNS0
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900354 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
355 statp->options |= RES_USE_EDNS0;
356 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900357#endif
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900358 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
359 statp->options |= RES_USE_DNAME;
360 } else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
361 if (ext == NULL) goto skip;
362 cp += sizeof("nibble:") - 1;
363 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
364 strncpy(ext->nsuffix, cp, (size_t) i);
365 ext->nsuffix[i] = '\0';
366 } else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
367 if (ext == NULL) goto skip;
368 cp += sizeof("nibble2:") - 1;
369 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
370 strncpy(ext->nsuffix2, cp, (size_t) i);
371 ext->nsuffix2[i] = '\0';
372 } else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
373 cp += sizeof("v6revmode:") - 1;
374 /* "nibble" and "bitstring" used to be valid */
375 if (!strncmp(cp, "single", sizeof("single") - 1)) {
376 statp->options |= RES_NO_NIBBLE2;
377 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
378 statp->options &= ~RES_NO_NIBBLE2;
379 }
380 } else {
381 /* XXX - print a warning here? */
382 }
383 skip:
384 /* skip to next run of spaces */
385 while (*cp && *cp != ' ' && *cp != '\t') cp++;
386 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900387}
388
Bernie Innocenti2fd418e2018-08-30 12:04:03 +0900389/*
Bernie Innocenti55864192018-08-30 04:05:20 +0900390 * This routine is for closing the socket if a virtual circuit is used and
391 * the program wants to close it. This provides support for endhostent()
392 * which expects to close the socket.
393 *
394 * This routine is not expected to be user visible.
395 */
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900396void res_nclose(res_state statp) {
397 int ns;
Bernie Innocenti55864192018-08-30 04:05:20 +0900398
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900399 if (statp->_vcsock >= 0) {
400 (void) close(statp->_vcsock);
401 statp->_vcsock = -1;
402 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
403 }
404 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
405 if (statp->_u._ext.nssocks[ns] != -1) {
406 (void) close(statp->_u._ext.nssocks[ns]);
407 statp->_u._ext.nssocks[ns] = -1;
408 }
409 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900410}
411
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900412void res_ndestroy(res_state statp) {
413 res_nclose(statp);
414 if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext);
415 statp->options &= ~RES_INIT;
416 statp->_u._ext.ext = NULL;
Bernie Innocenti55864192018-08-30 04:05:20 +0900417}
418
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900419const char* res_get_nibblesuffix(res_state statp) {
420 if (statp->_u._ext.ext) return (statp->_u._ext.ext->nsuffix);
421 return ("ip6.arpa");
Bernie Innocenti55864192018-08-30 04:05:20 +0900422}
423
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900424const char* res_get_nibblesuffix2(res_state statp) {
425 if (statp->_u._ext.ext) return (statp->_u._ext.ext->nsuffix2);
426 return ("ip6.int");
Bernie Innocenti55864192018-08-30 04:05:20 +0900427}
428
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900429void res_setservers(res_state statp, const union res_sockaddr_union* set, int cnt) {
430 int i, nserv;
431 size_t size;
Bernie Innocenti55864192018-08-30 04:05:20 +0900432
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900433 /* close open servers */
434 res_nclose(statp);
Bernie Innocenti55864192018-08-30 04:05:20 +0900435
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900436 /* cause rtt times to be forgotten */
437 statp->_u._ext.nscount = 0;
Bernie Innocenti55864192018-08-30 04:05:20 +0900438
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900439 nserv = 0;
440 for (i = 0; i < cnt && nserv < MAXNS; i++) {
441 switch (set->sin.sin_family) {
442 case AF_INET:
443 size = sizeof(set->sin);
444 if (statp->_u._ext.ext)
445 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin, size);
446 if (size <= sizeof(statp->nsaddr_list[nserv]))
447 memcpy(&statp->nsaddr_list[nserv], &set->sin, size);
448 else
449 statp->nsaddr_list[nserv].sin_family = 0;
450 nserv++;
451 break;
Bernie Innocenti55864192018-08-30 04:05:20 +0900452
453#ifdef HAS_INET6_STRUCTS
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900454 case AF_INET6:
455 size = sizeof(set->sin6);
456 if (statp->_u._ext.ext)
457 memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &set->sin6, size);
458 if (size <= sizeof(statp->nsaddr_list[nserv]))
459 memcpy(&statp->nsaddr_list[nserv], &set->sin6, size);
460 else
461 statp->nsaddr_list[nserv].sin_family = 0;
462 nserv++;
463 break;
Bernie Innocenti55864192018-08-30 04:05:20 +0900464#endif
465
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900466 default:
467 break;
468 }
469 set++;
470 }
471 statp->nscount = nserv;
Bernie Innocenti55864192018-08-30 04:05:20 +0900472}
473
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900474int res_getservers(res_state statp, union res_sockaddr_union* set, int cnt) {
475 int i;
476 size_t size;
477 uint16_t family;
Bernie Innocenti55864192018-08-30 04:05:20 +0900478
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900479 for (i = 0; i < statp->nscount && i < cnt; i++) {
480 if (statp->_u._ext.ext)
481 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
482 else
483 family = statp->nsaddr_list[i].sin_family;
Bernie Innocenti55864192018-08-30 04:05:20 +0900484
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900485 switch (family) {
486 case AF_INET:
487 size = sizeof(set->sin);
488 if (statp->_u._ext.ext)
489 memcpy(&set->sin, &statp->_u._ext.ext->nsaddrs[i], size);
490 else
491 memcpy(&set->sin, &statp->nsaddr_list[i], size);
492 break;
Bernie Innocenti55864192018-08-30 04:05:20 +0900493
494#ifdef HAS_INET6_STRUCTS
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900495 case AF_INET6:
496 size = sizeof(set->sin6);
497 if (statp->_u._ext.ext)
498 memcpy(&set->sin6, &statp->_u._ext.ext->nsaddrs[i], size);
499 else
500 memcpy(&set->sin6, &statp->nsaddr_list[i], size);
501 break;
Bernie Innocenti55864192018-08-30 04:05:20 +0900502#endif
503
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900504 default:
505 set->sin.sin_family = 0;
506 break;
507 }
508 set++;
509 }
510 return (statp->nscount);
Bernie Innocenti55864192018-08-30 04:05:20 +0900511}
512
Bernie Innocentif12d5bb2018-08-31 14:09:46 +0900513void res_setnetcontext(res_state statp, const struct android_net_context* netcontext) {
514 if (statp != NULL) {
515 statp->netid = netcontext->dns_netid;
516 statp->_mark = netcontext->dns_mark;
517 statp->qhook = netcontext->qhook;
518 if (netcontext->flags & NET_CONTEXT_FLAG_USE_EDNS) {
519 statp->options |= RES_USE_EDNS0 | RES_USE_DNSSEC;
520 }
521 }
Bernie Innocenti55864192018-08-30 04:05:20 +0900522}