1 /*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND ISC)
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34 *
35 * Permission to use, copy, modify, and distribute this software for any
36 * purpose with or without fee is hereby granted, provided that the above
37 * copyright notice and this permission notice appear in all copies, and that
38 * the name of Digital Equipment Corporation not be used in advertising or
39 * publicity pertaining to distribution of the document or software without
40 * specific, written prior permission.
41 *
42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49 * SOFTWARE.
50 */
51
52 /*
53 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
54 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
55 *
56 * Permission to use, copy, modify, and distribute this software for any
57 * purpose with or without fee is hereby granted, provided that the above
58 * copyright notice and this permission notice appear in all copies.
59 *
60 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
61 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
62 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
63 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
64 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
65 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
66 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67 */
68
69 #include "port_before.h"
70
71 #include "namespace.h"
72
73 #include <sys/param.h>
74 #include <sys/socket.h>
75 #include <sys/stat.h>
76 #include <sys/time.h>
77
78 #include <netinet/in.h>
79 #include <arpa/inet.h>
80 #include <arpa/nameser.h>
81
82 #include <ctype.h>
83 #include <stdio.h>
84 #include <stdlib.h>
85 #include <string.h>
86 #include <unistd.h>
87 #include <netdb.h>
88
89 #include "un-namespace.h"
90
91 #include "port_after.h"
92
93 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
94 #include <resolv.h>
95
96 #include "res_private.h"
97
98 #ifdef SOLARIS2
99 #include <sys/systeminfo.h>
100 #endif
101
102 static void res_setoptions(res_state, const char *, const char *);
103
104 #ifdef RESOLVSORT
105 static const char sort_mask[] = "/&";
106 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
107 static u_int32_t net_mask(struct in_addr);
108 #endif
109
110 #if !defined(isascii) /*%< XXX - could be a function */
111 # define isascii(c) (!(c & 0200))
112 #endif
113
114 /*
115 * Resolver state default settings.
116 */
117
118 /*%
119 * Set up default settings. If the configuration file exist, the values
120 * there will have precedence. Otherwise, the server address is set to
121 * the loopback address the default domain name comes from gethostname().
122 *
123 * The configuration file should always be used, since it is the only way
124 * to specify options and a default domain. If you are running a server
125 * on your local machine, you should say "nameserver 127.0.0.1" or
126 * "nameserver ::1" in the configuration file.
127 *
128 * Return 0 if completes successfully, -1 on error
129 */
130 int
res_ninit(res_state statp)131 res_ninit(res_state statp) {
132 extern int __res_vinit(res_state, int);
133
134 return (__res_vinit(statp, 0));
135 }
136
137 /*% This function has to be reachable by res_data.c but not publicly. */
138 int
__res_vinit(res_state statp,int preinit)139 __res_vinit(res_state statp, int preinit) {
140 union res_sockaddr_union u[] = {
141 { .sin = {
142 .sin_family = AF_INET,
143 #ifdef HAVE_SA_LEN
144 .sin_len = sizeof(struct sockaddr_in),
145 #endif
146 .sin_port = htons(NAMESERVER_PORT),
147 .sin_addr = { htonl(INADDR_LOOPBACK) },
148 } },
149 #ifdef HAS_INET6_STRUCTS
150 { .sin6 = {
151 .sin6_family = AF_INET6,
152 #ifdef HAVE_SA_LEN
153 .sin6_len = sizeof(struct sockaddr_in6),
154 #endif
155 .sin6_port = htons(NAMESERVER_PORT),
156 .sin6_addr = IN6ADDR_LOOPBACK_INIT,
157 } },
158 #endif
159 };
160 FILE *fp;
161 char *cp, **pp;
162 int n;
163 char buf[BUFSIZ];
164 int nserv = 0; /*%< number of nameserver records read from file */
165 int haveenv = 0;
166 int havesearch = 0;
167 #ifdef RESOLVSORT
168 int nsort = 0;
169 char *net;
170 #endif
171 int dots;
172 int maxns = MAXNS;
173
174 RES_SET_H_ERRNO(statp, 0);
175 if (statp->_u._ext.ext != NULL)
176 res_ndestroy(statp);
177
178 if (!preinit) {
179 statp->retrans = RES_TIMEOUT;
180 statp->retry = RES_DFLRETRY;
181 statp->options = RES_DEFAULT;
182 }
183
184 statp->id = res_nrandomid(statp);
185
186 statp->nscount = 0;
187 statp->ndots = 1;
188 statp->pfcode = 0;
189 statp->_vcsock = -1;
190 statp->_flags = 0;
191 statp->qhook = NULL;
192 statp->rhook = NULL;
193 statp->_u._ext.nscount = 0;
194 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
195 if (statp->_u._ext.ext != NULL) {
196 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
197 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
198 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
199 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
200 statp->_u._ext.ext->reload_period = 2;
201 } else {
202 /*
203 * Historically res_init() rarely, if at all, failed.
204 * Examples and applications exist which do not check
205 * our return code. Furthermore several applications
206 * simply call us to get the systems domainname. So
207 * rather then immediately fail here we store the
208 * failure, which is returned later, in h_errno. And
209 * prevent the collection of 'nameserver' information
210 * by setting maxns to 0. Thus applications that fail
211 * to check our return code wont be able to make
212 * queries anyhow.
213 */
214 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
215 maxns = 0;
216 }
217 #ifdef RESOLVSORT
218 statp->nsort = 0;
219 #endif
220 res_setservers(statp, u, nitems(u));
221
222 #ifdef SOLARIS2
223 /*
224 * The old libresolv derived the defaultdomain from NIS/NIS+.
225 * We want to keep this behaviour
226 */
227 {
228 char buf[sizeof(statp->defdname)], *cp;
229 int ret;
230
231 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
232 (unsigned int)ret <= sizeof(buf)) {
233 if (buf[0] == '+')
234 buf[0] = '.';
235 cp = strchr(buf, '.');
236 cp = (cp == NULL) ? buf : (cp + 1);
237 strncpy(statp->defdname, cp,
238 sizeof(statp->defdname) - 1);
239 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
240 }
241 }
242 #endif /* SOLARIS2 */
243
244 /* Allow user to override the local domain definition */
245 if ((cp = secure_getenv("LOCALDOMAIN")) != NULL) {
246 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
247 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
248 haveenv++;
249
250 /*
251 * Set search list to be blank-separated strings
252 * from rest of env value. Permits users of LOCALDOMAIN
253 * to still have a search list, and anyone to set the
254 * one that they want to use as an individual (even more
255 * important now that the rfc1535 stuff restricts searches)
256 */
257 cp = statp->defdname;
258 pp = statp->dnsrch;
259 *pp++ = cp;
260 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
261 if (*cp == '\n') /*%< silly backwards compat */
262 break;
263 else if (*cp == ' ' || *cp == '\t') {
264 *cp = 0;
265 n = 1;
266 } else if (n) {
267 *pp++ = cp;
268 n = 0;
269 havesearch = 1;
270 }
271 }
272 /* null terminate last domain if there are excess */
273 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
274 cp++;
275 *cp = '\0';
276 *pp++ = NULL;
277 }
278
279 #define MATCH(line, name) \
280 (!strncmp(line, name, sizeof(name) - 1) && \
281 (line[sizeof(name) - 1] == ' ' || \
282 line[sizeof(name) - 1] == '\t'))
283
284 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
285 struct stat sb;
286 struct timespec now;
287
288 if (statp->_u._ext.ext != NULL) {
289 if (_fstat(fileno(fp), &sb) == 0) {
290 statp->_u._ext.ext->conf_mtim = sb.st_mtim;
291 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
292 statp->_u._ext.ext->conf_stat = now.tv_sec;
293 }
294 }
295 }
296
297 /* read the config file */
298 while (fgets(buf, sizeof(buf), fp) != NULL) {
299 /* skip comments */
300 if (*buf == ';' || *buf == '#')
301 continue;
302 /* read default domain name */
303 if (MATCH(buf, "domain")) {
304 if (haveenv) /*%< skip if have from environ */
305 continue;
306 cp = buf + sizeof("domain") - 1;
307 while (*cp == ' ' || *cp == '\t')
308 cp++;
309 if ((*cp == '\0') || (*cp == '\n'))
310 continue;
311 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
312 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
313 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
314 *cp = '\0';
315 havesearch = 0;
316 continue;
317 }
318 /* set search list */
319 if (MATCH(buf, "search")) {
320 if (haveenv) /*%< skip if have from environ */
321 continue;
322 cp = buf + sizeof("search") - 1;
323 while (*cp == ' ' || *cp == '\t')
324 cp++;
325 if ((*cp == '\0') || (*cp == '\n'))
326 continue;
327 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
328 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
329 if ((cp = strchr(statp->defdname, '\n')) != NULL)
330 *cp = '\0';
331 /*
332 * Set search list to be blank-separated strings
333 * on rest of line.
334 */
335 cp = statp->defdname;
336 pp = statp->dnsrch;
337 *pp++ = cp;
338 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
339 if (*cp == ' ' || *cp == '\t') {
340 *cp = 0;
341 n = 1;
342 } else if (n) {
343 *pp++ = cp;
344 n = 0;
345 }
346 }
347 /* null terminate last domain if there are excess */
348 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
349 cp++;
350 *cp = '\0';
351 *pp++ = NULL;
352 havesearch = 1;
353 continue;
354 }
355 /* read nameservers to query */
356 if (MATCH(buf, "nameserver") && nserv < maxns) {
357 struct addrinfo hints, *ai;
358 char sbuf[NI_MAXSERV];
359 const size_t minsiz =
360 sizeof(statp->_u._ext.ext->nsaddrs[0]);
361
362 cp = buf + sizeof("nameserver") - 1;
363 while (*cp == ' ' || *cp == '\t')
364 cp++;
365 cp[strcspn(cp, ";# \t\n")] = '\0';
366 if ((*cp != '\0') && (*cp != '\n')) {
367 memset(&hints, 0, sizeof(hints));
368 hints.ai_family = PF_UNSPEC;
369 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
370 hints.ai_flags = AI_NUMERICHOST;
371 sprintf(sbuf, "%u", NAMESERVER_PORT);
372 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0) {
373 if (ai->ai_addrlen <= minsiz) {
374 if (statp->_u._ext.ext != NULL) {
375 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
376 ai->ai_addr, ai->ai_addrlen);
377 }
378 if (ai->ai_addrlen <=
379 sizeof(statp->nsaddr_list[nserv])) {
380 memcpy(&statp->nsaddr_list[nserv],
381 ai->ai_addr, ai->ai_addrlen);
382 } else
383 statp->nsaddr_list[nserv].sin_family = 0;
384 nserv++;
385 }
386 freeaddrinfo(ai);
387 }
388 }
389 continue;
390 }
391 #ifdef RESOLVSORT
392 if (MATCH(buf, "sortlist")) {
393 struct in_addr a;
394 struct in6_addr a6;
395 int m, i;
396 u_char *u;
397 struct __res_state_ext *ext = statp->_u._ext.ext;
398
399 cp = buf + sizeof("sortlist") - 1;
400 while (nsort < MAXRESOLVSORT) {
401 while (*cp == ' ' || *cp == '\t')
402 cp++;
403 if (*cp == '\0' || *cp == '\n' || *cp == ';')
404 break;
405 net = cp;
406 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
407 isascii(*cp) && !isspace((unsigned char)*cp))
408 cp++;
409 n = *cp;
410 *cp = 0;
411 if (inet_aton(net, &a)) {
412 statp->sort_list[nsort].addr = a;
413 if (ISSORTMASK(n)) {
414 *cp++ = n;
415 net = cp;
416 while (*cp && *cp != ';' &&
417 isascii(*cp) &&
418 !isspace((unsigned char)*cp))
419 cp++;
420 n = *cp;
421 *cp = 0;
422 if (inet_aton(net, &a)) {
423 statp->sort_list[nsort].mask = a.s_addr;
424 } else {
425 statp->sort_list[nsort].mask =
426 net_mask(statp->sort_list[nsort].addr);
427 }
428 } else {
429 statp->sort_list[nsort].mask =
430 net_mask(statp->sort_list[nsort].addr);
431 }
432 ext->sort_list[nsort].af = AF_INET;
433 ext->sort_list[nsort].addr.ina =
434 statp->sort_list[nsort].addr;
435 ext->sort_list[nsort].mask.ina.s_addr =
436 statp->sort_list[nsort].mask;
437 nsort++;
438 }
439 else if (inet_pton(AF_INET6, net, &a6) == 1) {
440
441 ext->sort_list[nsort].af = AF_INET6;
442 ext->sort_list[nsort].addr.in6a = a6;
443 u = (u_char *)&ext->sort_list[nsort].mask.in6a;
444 *cp++ = n;
445 net = cp;
446 while (*cp && *cp != ';' &&
447 isascii(*cp) && !isspace(*cp))
448 cp++;
449 m = n;
450 n = *cp;
451 *cp = 0;
452 switch (m) {
453 case '/':
454 m = atoi(net);
455 break;
456 case '&':
457 if (inet_pton(AF_INET6, net, u) == 1) {
458 m = -1;
459 break;
460 }
461 /*FALLTHROUGH*/
462 default:
463 m = sizeof(struct in6_addr) * CHAR_BIT;
464 break;
465 }
466 if (m >= 0) {
467 for (i = 0; i < sizeof(struct in6_addr); i++) {
468 if (m <= 0) {
469 *u = 0;
470 } else {
471 m -= CHAR_BIT;
472 *u = (u_char)~0;
473 if (m < 0)
474 *u <<= -m;
475 }
476 u++;
477 }
478 }
479 statp->sort_list[nsort].addr.s_addr =
480 (u_int32_t)0xffffffff;
481 statp->sort_list[nsort].mask =
482 (u_int32_t)0xffffffff;
483 nsort++;
484 }
485 *cp = n;
486 }
487 continue;
488 }
489 #endif
490 if (MATCH(buf, "options")) {
491 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
492 continue;
493 }
494 }
495 if (nserv > 0)
496 statp->nscount = nserv;
497 #ifdef RESOLVSORT
498 statp->nsort = nsort;
499 #endif
500 (void) fclose(fp);
501 }
502
503 /* guess default domain if not set */
504 if (statp->defdname[0] == 0 &&
505 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
506 (cp = strchr(buf, '.')) != NULL)
507 strcpy(statp->defdname, cp + 1);
508
509 /* find components of local domain that might be searched */
510 if (havesearch == 0) {
511 pp = statp->dnsrch;
512 *pp++ = statp->defdname;
513 *pp = NULL;
514
515 dots = 0;
516 for (cp = statp->defdname; *cp; cp++)
517 dots += (*cp == '.');
518
519 cp = statp->defdname;
520 while (pp < statp->dnsrch + MAXDFLSRCH) {
521 if (dots < LOCALDOMAINPARTS)
522 break;
523 cp = strchr(cp, '.') + 1; /*%< we know there is one */
524 *pp++ = cp;
525 dots--;
526 }
527 *pp = NULL;
528 #ifdef DEBUG
529 if (statp->options & RES_DEBUG) {
530 printf(";; res_init()... default dnsrch list:\n");
531 for (pp = statp->dnsrch; *pp; pp++)
532 printf(";;\t%s\n", *pp);
533 printf(";;\t..END..\n");
534 }
535 #endif
536 }
537
538 if (issetugid())
539 statp->options |= RES_NOALIASES;
540 else if ((cp = getenv("RES_OPTIONS")) != NULL)
541 res_setoptions(statp, cp, "env");
542 statp->options |= RES_INIT;
543 return (statp->res_h_errno);
544 }
545
546 static void
res_setoptions(res_state statp,const char * options,const char * source)547 res_setoptions(res_state statp, const char *options, const char *source)
548 {
549 const char *cp = options;
550 int i;
551 struct __res_state_ext *ext = statp->_u._ext.ext;
552
553 #ifdef DEBUG
554 if (statp->options & RES_DEBUG)
555 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
556 options, source);
557 #endif
558 while (*cp) {
559 /* skip leading and inner runs of spaces */
560 while (*cp == ' ' || *cp == '\t')
561 cp++;
562 /* search for and process individual options */
563 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
564 i = atoi(cp + sizeof("ndots:") - 1);
565 if (i <= RES_MAXNDOTS)
566 statp->ndots = i;
567 else
568 statp->ndots = RES_MAXNDOTS;
569 #ifdef DEBUG
570 if (statp->options & RES_DEBUG)
571 printf(";;\tndots=%d\n", statp->ndots);
572 #endif
573 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
574 i = atoi(cp + sizeof("timeout:") - 1);
575 if (i <= RES_MAXRETRANS)
576 statp->retrans = i;
577 else
578 statp->retrans = RES_MAXRETRANS;
579 #ifdef DEBUG
580 if (statp->options & RES_DEBUG)
581 printf(";;\ttimeout=%d\n", statp->retrans);
582 #endif
583 #ifdef SOLARIS2
584 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
585 /*
586 * For backward compatibility, 'retrans' is
587 * supported as an alias for 'timeout', though
588 * without an imposed maximum.
589 */
590 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
591 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
592 /*
593 * For backward compatibility, 'retry' is
594 * supported as an alias for 'attempts', though
595 * without an imposed maximum.
596 */
597 statp->retry = atoi(cp + sizeof("retry:") - 1);
598 #endif /* SOLARIS2 */
599 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
600 i = atoi(cp + sizeof("attempts:") - 1);
601 if (i <= RES_MAXRETRY)
602 statp->retry = i;
603 else
604 statp->retry = RES_MAXRETRY;
605 #ifdef DEBUG
606 if (statp->options & RES_DEBUG)
607 printf(";;\tattempts=%d\n", statp->retry);
608 #endif
609 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
610 #ifdef DEBUG
611 if (!(statp->options & RES_DEBUG)) {
612 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
613 options, source);
614 statp->options |= RES_DEBUG;
615 }
616 printf(";;\tdebug\n");
617 #endif
618 } else if (!strncmp(cp, "no_tld_query",
619 sizeof("no_tld_query") - 1) ||
620 !strncmp(cp, "no-tld-query",
621 sizeof("no-tld-query") - 1)) {
622 statp->options |= RES_NOTLDQUERY;
623 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
624 statp->options |= RES_USE_INET6;
625 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
626 statp->options |= RES_INSECURE1;
627 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
628 statp->options |= RES_INSECURE2;
629 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
630 statp->options |= RES_ROTATE;
631 } else if (!strncmp(cp, "usevc", sizeof("usevc") - 1)) {
632 statp->options |= RES_USEVC;
633 } else if (!strncmp(cp, "no-check-names",
634 sizeof("no-check-names") - 1)) {
635 statp->options |= RES_NOCHECKNAME;
636 } else if (!strncmp(cp, "reload-period:",
637 sizeof("reload-period:") - 1)) {
638 if (ext != NULL) {
639 ext->reload_period = (u_short)
640 atoi(cp + sizeof("reload-period:") - 1);
641 }
642 }
643 #ifdef RES_USE_EDNS0
644 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
645 statp->options |= RES_USE_EDNS0;
646 }
647 #endif
648 #ifndef _LIBC
649 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
650 statp->options |= RES_USE_DNAME;
651 }
652 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
653 if (ext == NULL)
654 goto skip;
655 cp += sizeof("nibble:") - 1;
656 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
657 strncpy(ext->nsuffix, cp, i);
658 ext->nsuffix[i] = '\0';
659 }
660 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
661 if (ext == NULL)
662 goto skip;
663 cp += sizeof("nibble2:") - 1;
664 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
665 strncpy(ext->nsuffix2, cp, i);
666 ext->nsuffix2[i] = '\0';
667 }
668 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
669 cp += sizeof("v6revmode:") - 1;
670 /* "nibble" and "bitstring" used to be valid */
671 if (!strncmp(cp, "single", sizeof("single") - 1)) {
672 statp->options |= RES_NO_NIBBLE2;
673 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
674 statp->options &=
675 ~RES_NO_NIBBLE2;
676 }
677 }
678 #endif
679 else {
680 /* XXX - print a warning here? */
681 }
682 #ifndef _LIBC
683 skip:
684 #endif
685 /* skip to next run of spaces */
686 while (*cp && *cp != ' ' && *cp != '\t')
687 cp++;
688 }
689 }
690
691 #ifdef RESOLVSORT
692 /* XXX - should really support CIDR which means explicit masks always. */
693 static u_int32_t
net_mask(struct in_addr in)694 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
695 {
696 u_int32_t i = ntohl(in.s_addr);
697
698 if (IN_CLASSA(i))
699 return (htonl(IN_CLASSA_NET));
700 else if (IN_CLASSB(i))
701 return (htonl(IN_CLASSB_NET));
702 return (htonl(IN_CLASSC_NET));
703 }
704 #endif
705
706 void
freebsd15_res_rndinit(res_state statp)707 freebsd15_res_rndinit(res_state statp)
708 {
709 (void)statp;
710 }
711 __sym_compat(__res_rndinit, freebsd15_res_rndinit, FBSD_1.4);
712
713 u_int
res_nrandomid(res_state statp)714 res_nrandomid(res_state statp) {
715 (void) statp;
716
717 return ((u_int)(arc4random() & 0xffff));
718 }
719
720 /*%
721 * This routine is for closing the socket if a virtual circuit is used and
722 * the program wants to close it. This provides support for endhostent()
723 * which expects to close the socket.
724 *
725 * This routine is not expected to be user visible.
726 */
727 void
res_nclose(res_state statp)728 res_nclose(res_state statp) {
729 int ns;
730
731 if (statp->_vcsock >= 0) {
732 (void) _close(statp->_vcsock);
733 statp->_vcsock = -1;
734 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
735 }
736 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
737 if (statp->_u._ext.nssocks[ns] != -1) {
738 (void) _close(statp->_u._ext.nssocks[ns]);
739 statp->_u._ext.nssocks[ns] = -1;
740 }
741 }
742 }
743
744 void
res_ndestroy(res_state statp)745 res_ndestroy(res_state statp) {
746 res_nclose(statp);
747 if (statp->_u._ext.ext != NULL) {
748 free(statp->_u._ext.ext);
749 statp->_u._ext.ext = NULL;
750 }
751 statp->options &= ~RES_INIT;
752 }
753
754 #ifndef _LIBC
755 const char *
res_get_nibblesuffix(res_state statp)756 res_get_nibblesuffix(res_state statp) {
757 if (statp->_u._ext.ext)
758 return (statp->_u._ext.ext->nsuffix);
759 return ("ip6.arpa");
760 }
761
762 const char *
res_get_nibblesuffix2(res_state statp)763 res_get_nibblesuffix2(res_state statp) {
764 if (statp->_u._ext.ext)
765 return (statp->_u._ext.ext->nsuffix2);
766 return ("ip6.int");
767 }
768 #endif
769
770 void
res_setservers(res_state statp,const union res_sockaddr_union * set,int cnt)771 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
772 int i, nserv;
773 size_t size;
774
775 /* close open servers */
776 res_nclose(statp);
777
778 /* cause rtt times to be forgotten */
779 statp->_u._ext.nscount = 0;
780
781 nserv = 0;
782 for (i = 0; i < cnt && nserv < MAXNS; i++) {
783 switch (set->sin.sin_family) {
784 case AF_INET:
785 size = sizeof(set->sin);
786 if (statp->_u._ext.ext)
787 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
788 &set->sin, size);
789 if (size <= sizeof(statp->nsaddr_list[nserv]))
790 memcpy(&statp->nsaddr_list[nserv],
791 &set->sin, size);
792 else
793 statp->nsaddr_list[nserv].sin_family = 0;
794 nserv++;
795 break;
796
797 #ifdef HAS_INET6_STRUCTS
798 case AF_INET6:
799 size = sizeof(set->sin6);
800 if (statp->_u._ext.ext)
801 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
802 &set->sin6, size);
803 if (size <= sizeof(statp->nsaddr_list[nserv]))
804 memcpy(&statp->nsaddr_list[nserv],
805 &set->sin6, size);
806 else
807 statp->nsaddr_list[nserv].sin_family = 0;
808 nserv++;
809 break;
810 #endif
811
812 default:
813 break;
814 }
815 set++;
816 }
817 statp->nscount = nserv;
818
819 }
820
821 int
res_getservers(res_state statp,union res_sockaddr_union * set,int cnt)822 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
823 int i;
824 size_t size;
825 u_int16_t family;
826
827 for (i = 0; i < statp->nscount && i < cnt; i++) {
828 if (statp->_u._ext.ext)
829 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
830 else
831 family = statp->nsaddr_list[i].sin_family;
832
833 switch (family) {
834 case AF_INET:
835 size = sizeof(set->sin);
836 if (statp->_u._ext.ext)
837 memcpy(&set->sin,
838 &statp->_u._ext.ext->nsaddrs[i],
839 size);
840 else
841 memcpy(&set->sin, &statp->nsaddr_list[i],
842 size);
843 break;
844
845 #ifdef HAS_INET6_STRUCTS
846 case AF_INET6:
847 size = sizeof(set->sin6);
848 if (statp->_u._ext.ext)
849 memcpy(&set->sin6,
850 &statp->_u._ext.ext->nsaddrs[i],
851 size);
852 else
853 memcpy(&set->sin6, &statp->nsaddr_list[i],
854 size);
855 break;
856 #endif
857
858 default:
859 set->sin.sin_family = 0;
860 break;
861 }
862 set++;
863 }
864 return (statp->nscount);
865 }
866
867 /*! \file */
868