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 #if defined(LIBC_SCCS) && !defined(lint)
70 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
71 static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $";
72 #endif /* LIBC_SCCS and not lint */
73 #include "port_before.h"
74
75 #include "namespace.h"
76
77 #include <sys/param.h>
78 #include <sys/socket.h>
79 #include <sys/stat.h>
80 #include <sys/time.h>
81
82 #include <netinet/in.h>
83 #include <arpa/inet.h>
84 #include <arpa/nameser.h>
85
86 #include <ctype.h>
87 #include <stdio.h>
88 #include <stdlib.h>
89 #include <string.h>
90 #include <unistd.h>
91 #include <netdb.h>
92
93 #ifndef HAVE_MD5
94 # include "../dst/md5.h"
95 #else
96 # ifdef SOLARIS2
97 # include <sys/md5.h>
98 # elif _LIBC
99 # include <md5.h>
100 # endif
101 #endif
102 #ifndef _MD5_H_
103 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
104 #endif
105
106 #include "un-namespace.h"
107
108 #include "port_after.h"
109
110 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
111 #include <resolv.h>
112
113 #include "res_private.h"
114
115 /*% Options. Should all be left alone. */
116 #define RESOLVSORT
117 #ifndef DEBUG
118 #define DEBUG
119 #endif
120
121 #ifdef SOLARIS2
122 #include <sys/systeminfo.h>
123 #endif
124
125 static void res_setoptions(res_state, const char *, const char *);
126
127 #ifdef RESOLVSORT
128 static const char sort_mask[] = "/&";
129 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
130 static u_int32_t net_mask(struct in_addr);
131 #endif
132
133 #if !defined(isascii) /*%< XXX - could be a function */
134 # define isascii(c) (!(c & 0200))
135 #endif
136
137 /*
138 * Resolver state default settings.
139 */
140
141 /*%
142 * Set up default settings. If the configuration file exist, the values
143 * there will have precedence. Otherwise, the server address is set to
144 * INADDR_ANY and the default domain name comes from the gethostname().
145 *
146 * An interim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
147 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
148 * since it was noted that INADDR_ANY actually meant ``the first interface
149 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
150 * it had to be "up" in order for you to reach your own name server. It
151 * was later decided that since the recommended practice is to always
152 * install local static routes through 127.0.0.1 for all your network
153 * interfaces, that we could solve this problem without a code change.
154 *
155 * The configuration file should always be used, since it is the only way
156 * to specify a default domain. If you are running a server on your local
157 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
158 * in the configuration file.
159 *
160 * Return 0 if completes successfully, -1 on error
161 */
162 int
res_ninit(res_state statp)163 res_ninit(res_state statp) {
164 extern int __res_vinit(res_state, int);
165
166 return (__res_vinit(statp, 0));
167 }
168
169 /*% This function has to be reachable by res_data.c but not publicly. */
170 int
__res_vinit(res_state statp,int preinit)171 __res_vinit(res_state statp, int preinit) {
172 FILE *fp;
173 char *cp, **pp;
174 int n;
175 char buf[BUFSIZ];
176 int nserv = 0; /*%< number of nameserver records read from file */
177 int haveenv = 0;
178 int havesearch = 0;
179 #ifdef RESOLVSORT
180 int nsort = 0;
181 char *net;
182 #endif
183 int dots;
184 union res_sockaddr_union u[2];
185 int maxns = MAXNS;
186
187 RES_SET_H_ERRNO(statp, 0);
188 if (statp->_u._ext.ext != NULL)
189 res_ndestroy(statp);
190
191 if (!preinit) {
192 statp->retrans = RES_TIMEOUT;
193 statp->retry = RES_DFLRETRY;
194 statp->options = RES_DEFAULT;
195 }
196
197 statp->_rnd = malloc(16);
198 res_rndinit(statp);
199 statp->id = res_nrandomid(statp);
200
201 memset(u, 0, sizeof(u));
202 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
203 u[nserv].sin.sin_family = AF_INET;
204 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
205 #ifdef HAVE_SA_LEN
206 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
207 #endif
208 nserv++;
209 #ifdef HAS_INET6_STRUCTS
210 u[nserv].sin6.sin6_addr = in6addr_any;
211 u[nserv].sin6.sin6_family = AF_INET6;
212 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
213 #ifdef HAVE_SA_LEN
214 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
215 #endif
216 nserv++;
217 #endif
218 statp->nscount = 0;
219 statp->ndots = 1;
220 statp->pfcode = 0;
221 statp->_vcsock = -1;
222 statp->_flags = 0;
223 statp->qhook = NULL;
224 statp->rhook = NULL;
225 statp->_u._ext.nscount = 0;
226 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
227 if (statp->_u._ext.ext != NULL) {
228 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
229 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
230 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
231 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
232 statp->_u._ext.ext->reload_period = 2;
233 } else {
234 /*
235 * Historically res_init() rarely, if at all, failed.
236 * Examples and applications exist which do not check
237 * our return code. Furthermore several applications
238 * simply call us to get the systems domainname. So
239 * rather then immediately fail here we store the
240 * failure, which is returned later, in h_errno. And
241 * prevent the collection of 'nameserver' information
242 * by setting maxns to 0. Thus applications that fail
243 * to check our return code wont be able to make
244 * queries anyhow.
245 */
246 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
247 maxns = 0;
248 }
249 #ifdef RESOLVSORT
250 statp->nsort = 0;
251 #endif
252 res_setservers(statp, u, nserv);
253
254 #ifdef SOLARIS2
255 /*
256 * The old libresolv derived the defaultdomain from NIS/NIS+.
257 * We want to keep this behaviour
258 */
259 {
260 char buf[sizeof(statp->defdname)], *cp;
261 int ret;
262
263 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
264 (unsigned int)ret <= sizeof(buf)) {
265 if (buf[0] == '+')
266 buf[0] = '.';
267 cp = strchr(buf, '.');
268 cp = (cp == NULL) ? buf : (cp + 1);
269 strncpy(statp->defdname, cp,
270 sizeof(statp->defdname) - 1);
271 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
272 }
273 }
274 #endif /* SOLARIS2 */
275
276 /* Allow user to override the local domain definition */
277 if ((cp = secure_getenv("LOCALDOMAIN")) != NULL) {
278 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
279 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
280 haveenv++;
281
282 /*
283 * Set search list to be blank-separated strings
284 * from rest of env value. Permits users of LOCALDOMAIN
285 * to still have a search list, and anyone to set the
286 * one that they want to use as an individual (even more
287 * important now that the rfc1535 stuff restricts searches)
288 */
289 cp = statp->defdname;
290 pp = statp->dnsrch;
291 *pp++ = cp;
292 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
293 if (*cp == '\n') /*%< silly backwards compat */
294 break;
295 else if (*cp == ' ' || *cp == '\t') {
296 *cp = 0;
297 n = 1;
298 } else if (n) {
299 *pp++ = cp;
300 n = 0;
301 havesearch = 1;
302 }
303 }
304 /* null terminate last domain if there are excess */
305 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
306 cp++;
307 *cp = '\0';
308 *pp++ = NULL;
309 }
310
311 #define MATCH(line, name) \
312 (!strncmp(line, name, sizeof(name) - 1) && \
313 (line[sizeof(name) - 1] == ' ' || \
314 line[sizeof(name) - 1] == '\t'))
315
316 nserv = 0;
317 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
318 struct stat sb;
319 struct timespec now;
320
321 if (statp->_u._ext.ext != NULL) {
322 if (_fstat(fileno(fp), &sb) == 0) {
323 statp->_u._ext.ext->conf_mtim = sb.st_mtim;
324 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
325 statp->_u._ext.ext->conf_stat = now.tv_sec;
326 }
327 }
328 }
329
330 /* read the config file */
331 while (fgets(buf, sizeof(buf), fp) != NULL) {
332 /* skip comments */
333 if (*buf == ';' || *buf == '#')
334 continue;
335 /* read default domain name */
336 if (MATCH(buf, "domain")) {
337 if (haveenv) /*%< skip if have from environ */
338 continue;
339 cp = buf + sizeof("domain") - 1;
340 while (*cp == ' ' || *cp == '\t')
341 cp++;
342 if ((*cp == '\0') || (*cp == '\n'))
343 continue;
344 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
345 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
346 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
347 *cp = '\0';
348 havesearch = 0;
349 continue;
350 }
351 /* set search list */
352 if (MATCH(buf, "search")) {
353 if (haveenv) /*%< skip if have from environ */
354 continue;
355 cp = buf + sizeof("search") - 1;
356 while (*cp == ' ' || *cp == '\t')
357 cp++;
358 if ((*cp == '\0') || (*cp == '\n'))
359 continue;
360 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
361 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
362 if ((cp = strchr(statp->defdname, '\n')) != NULL)
363 *cp = '\0';
364 /*
365 * Set search list to be blank-separated strings
366 * on rest of line.
367 */
368 cp = statp->defdname;
369 pp = statp->dnsrch;
370 *pp++ = cp;
371 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
372 if (*cp == ' ' || *cp == '\t') {
373 *cp = 0;
374 n = 1;
375 } else if (n) {
376 *pp++ = cp;
377 n = 0;
378 }
379 }
380 /* null terminate last domain if there are excess */
381 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
382 cp++;
383 *cp = '\0';
384 *pp++ = NULL;
385 havesearch = 1;
386 continue;
387 }
388 /* read nameservers to query */
389 if (MATCH(buf, "nameserver") && nserv < maxns) {
390 struct addrinfo hints, *ai;
391 char sbuf[NI_MAXSERV];
392 const size_t minsiz =
393 sizeof(statp->_u._ext.ext->nsaddrs[0]);
394
395 cp = buf + sizeof("nameserver") - 1;
396 while (*cp == ' ' || *cp == '\t')
397 cp++;
398 cp[strcspn(cp, ";# \t\n")] = '\0';
399 if ((*cp != '\0') && (*cp != '\n')) {
400 memset(&hints, 0, sizeof(hints));
401 hints.ai_family = PF_UNSPEC;
402 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
403 hints.ai_flags = AI_NUMERICHOST;
404 sprintf(sbuf, "%u", NAMESERVER_PORT);
405 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0) {
406 if (ai->ai_addrlen <= minsiz) {
407 if (statp->_u._ext.ext != NULL) {
408 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
409 ai->ai_addr, ai->ai_addrlen);
410 }
411 if (ai->ai_addrlen <=
412 sizeof(statp->nsaddr_list[nserv])) {
413 memcpy(&statp->nsaddr_list[nserv],
414 ai->ai_addr, ai->ai_addrlen);
415 } else
416 statp->nsaddr_list[nserv].sin_family = 0;
417 nserv++;
418 }
419 freeaddrinfo(ai);
420 }
421 }
422 continue;
423 }
424 #ifdef RESOLVSORT
425 if (MATCH(buf, "sortlist")) {
426 struct in_addr a;
427 struct in6_addr a6;
428 int m, i;
429 u_char *u;
430 struct __res_state_ext *ext = statp->_u._ext.ext;
431
432 cp = buf + sizeof("sortlist") - 1;
433 while (nsort < MAXRESOLVSORT) {
434 while (*cp == ' ' || *cp == '\t')
435 cp++;
436 if (*cp == '\0' || *cp == '\n' || *cp == ';')
437 break;
438 net = cp;
439 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
440 isascii(*cp) && !isspace((unsigned char)*cp))
441 cp++;
442 n = *cp;
443 *cp = 0;
444 if (inet_aton(net, &a)) {
445 statp->sort_list[nsort].addr = a;
446 if (ISSORTMASK(n)) {
447 *cp++ = n;
448 net = cp;
449 while (*cp && *cp != ';' &&
450 isascii(*cp) &&
451 !isspace((unsigned char)*cp))
452 cp++;
453 n = *cp;
454 *cp = 0;
455 if (inet_aton(net, &a)) {
456 statp->sort_list[nsort].mask = a.s_addr;
457 } else {
458 statp->sort_list[nsort].mask =
459 net_mask(statp->sort_list[nsort].addr);
460 }
461 } else {
462 statp->sort_list[nsort].mask =
463 net_mask(statp->sort_list[nsort].addr);
464 }
465 ext->sort_list[nsort].af = AF_INET;
466 ext->sort_list[nsort].addr.ina =
467 statp->sort_list[nsort].addr;
468 ext->sort_list[nsort].mask.ina.s_addr =
469 statp->sort_list[nsort].mask;
470 nsort++;
471 }
472 else if (inet_pton(AF_INET6, net, &a6) == 1) {
473
474 ext->sort_list[nsort].af = AF_INET6;
475 ext->sort_list[nsort].addr.in6a = a6;
476 u = (u_char *)&ext->sort_list[nsort].mask.in6a;
477 *cp++ = n;
478 net = cp;
479 while (*cp && *cp != ';' &&
480 isascii(*cp) && !isspace(*cp))
481 cp++;
482 m = n;
483 n = *cp;
484 *cp = 0;
485 switch (m) {
486 case '/':
487 m = atoi(net);
488 break;
489 case '&':
490 if (inet_pton(AF_INET6, net, u) == 1) {
491 m = -1;
492 break;
493 }
494 /*FALLTHROUGH*/
495 default:
496 m = sizeof(struct in6_addr) * CHAR_BIT;
497 break;
498 }
499 if (m >= 0) {
500 for (i = 0; i < sizeof(struct in6_addr); i++) {
501 if (m <= 0) {
502 *u = 0;
503 } else {
504 m -= CHAR_BIT;
505 *u = (u_char)~0;
506 if (m < 0)
507 *u <<= -m;
508 }
509 u++;
510 }
511 }
512 statp->sort_list[nsort].addr.s_addr =
513 (u_int32_t)0xffffffff;
514 statp->sort_list[nsort].mask =
515 (u_int32_t)0xffffffff;
516 nsort++;
517 }
518 *cp = n;
519 }
520 continue;
521 }
522 #endif
523 if (MATCH(buf, "options")) {
524 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
525 continue;
526 }
527 }
528 if (nserv > 0)
529 statp->nscount = nserv;
530 #ifdef RESOLVSORT
531 statp->nsort = nsort;
532 #endif
533 (void) fclose(fp);
534 }
535 /*
536 * Last chance to get a nameserver. This should not normally
537 * be necessary
538 */
539 #ifdef NO_RESOLV_CONF
540 if(nserv == 0)
541 nserv = get_nameservers(statp);
542 #endif
543
544 if (statp->defdname[0] == 0 &&
545 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
546 (cp = strchr(buf, '.')) != NULL)
547 strcpy(statp->defdname, cp + 1);
548
549 /* find components of local domain that might be searched */
550 if (havesearch == 0) {
551 pp = statp->dnsrch;
552 *pp++ = statp->defdname;
553 *pp = NULL;
554
555 dots = 0;
556 for (cp = statp->defdname; *cp; cp++)
557 dots += (*cp == '.');
558
559 cp = statp->defdname;
560 while (pp < statp->dnsrch + MAXDFLSRCH) {
561 if (dots < LOCALDOMAINPARTS)
562 break;
563 cp = strchr(cp, '.') + 1; /*%< we know there is one */
564 *pp++ = cp;
565 dots--;
566 }
567 *pp = NULL;
568 #ifdef DEBUG
569 if (statp->options & RES_DEBUG) {
570 printf(";; res_init()... default dnsrch list:\n");
571 for (pp = statp->dnsrch; *pp; pp++)
572 printf(";;\t%s\n", *pp);
573 printf(";;\t..END..\n");
574 }
575 #endif
576 }
577
578 if (issetugid())
579 statp->options |= RES_NOALIASES;
580 else if ((cp = getenv("RES_OPTIONS")) != NULL)
581 res_setoptions(statp, cp, "env");
582 statp->options |= RES_INIT;
583 return (statp->res_h_errno);
584 }
585
586 static void
res_setoptions(res_state statp,const char * options,const char * source)587 res_setoptions(res_state statp, const char *options, const char *source)
588 {
589 const char *cp = options;
590 int i;
591 struct __res_state_ext *ext = statp->_u._ext.ext;
592
593 #ifdef DEBUG
594 if (statp->options & RES_DEBUG)
595 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
596 options, source);
597 #endif
598 while (*cp) {
599 /* skip leading and inner runs of spaces */
600 while (*cp == ' ' || *cp == '\t')
601 cp++;
602 /* search for and process individual options */
603 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
604 i = atoi(cp + sizeof("ndots:") - 1);
605 if (i <= RES_MAXNDOTS)
606 statp->ndots = i;
607 else
608 statp->ndots = RES_MAXNDOTS;
609 #ifdef DEBUG
610 if (statp->options & RES_DEBUG)
611 printf(";;\tndots=%d\n", statp->ndots);
612 #endif
613 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
614 i = atoi(cp + sizeof("timeout:") - 1);
615 if (i <= RES_MAXRETRANS)
616 statp->retrans = i;
617 else
618 statp->retrans = RES_MAXRETRANS;
619 #ifdef DEBUG
620 if (statp->options & RES_DEBUG)
621 printf(";;\ttimeout=%d\n", statp->retrans);
622 #endif
623 #ifdef SOLARIS2
624 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
625 /*
626 * For backward compatibility, 'retrans' is
627 * supported as an alias for 'timeout', though
628 * without an imposed maximum.
629 */
630 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
631 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
632 /*
633 * For backward compatibility, 'retry' is
634 * supported as an alias for 'attempts', though
635 * without an imposed maximum.
636 */
637 statp->retry = atoi(cp + sizeof("retry:") - 1);
638 #endif /* SOLARIS2 */
639 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
640 i = atoi(cp + sizeof("attempts:") - 1);
641 if (i <= RES_MAXRETRY)
642 statp->retry = i;
643 else
644 statp->retry = RES_MAXRETRY;
645 #ifdef DEBUG
646 if (statp->options & RES_DEBUG)
647 printf(";;\tattempts=%d\n", statp->retry);
648 #endif
649 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
650 #ifdef DEBUG
651 if (!(statp->options & RES_DEBUG)) {
652 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
653 options, source);
654 statp->options |= RES_DEBUG;
655 }
656 printf(";;\tdebug\n");
657 #endif
658 } else if (!strncmp(cp, "no_tld_query",
659 sizeof("no_tld_query") - 1) ||
660 !strncmp(cp, "no-tld-query",
661 sizeof("no-tld-query") - 1)) {
662 statp->options |= RES_NOTLDQUERY;
663 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
664 statp->options |= RES_USE_INET6;
665 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
666 statp->options |= RES_INSECURE1;
667 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
668 statp->options |= RES_INSECURE2;
669 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
670 statp->options |= RES_ROTATE;
671 } else if (!strncmp(cp, "usevc", sizeof("usevc") - 1)) {
672 statp->options |= RES_USEVC;
673 } else if (!strncmp(cp, "no-check-names",
674 sizeof("no-check-names") - 1)) {
675 statp->options |= RES_NOCHECKNAME;
676 } else if (!strncmp(cp, "reload-period:",
677 sizeof("reload-period:") - 1)) {
678 if (ext != NULL) {
679 ext->reload_period = (u_short)
680 atoi(cp + sizeof("reload-period:") - 1);
681 }
682 }
683 #ifdef RES_USE_EDNS0
684 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
685 statp->options |= RES_USE_EDNS0;
686 }
687 #endif
688 #ifndef _LIBC
689 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
690 statp->options |= RES_USE_DNAME;
691 }
692 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
693 if (ext == NULL)
694 goto skip;
695 cp += sizeof("nibble:") - 1;
696 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
697 strncpy(ext->nsuffix, cp, i);
698 ext->nsuffix[i] = '\0';
699 }
700 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
701 if (ext == NULL)
702 goto skip;
703 cp += sizeof("nibble2:") - 1;
704 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
705 strncpy(ext->nsuffix2, cp, i);
706 ext->nsuffix2[i] = '\0';
707 }
708 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
709 cp += sizeof("v6revmode:") - 1;
710 /* "nibble" and "bitstring" used to be valid */
711 if (!strncmp(cp, "single", sizeof("single") - 1)) {
712 statp->options |= RES_NO_NIBBLE2;
713 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
714 statp->options &=
715 ~RES_NO_NIBBLE2;
716 }
717 }
718 #endif
719 else {
720 /* XXX - print a warning here? */
721 }
722 #ifndef _LIBC
723 skip:
724 #endif
725 /* skip to next run of spaces */
726 while (*cp && *cp != ' ' && *cp != '\t')
727 cp++;
728 }
729 }
730
731 #ifdef RESOLVSORT
732 /* XXX - should really support CIDR which means explicit masks always. */
733 static u_int32_t
net_mask(struct in_addr in)734 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
735 {
736 u_int32_t i = ntohl(in.s_addr);
737
738 if (IN_CLASSA(i))
739 return (htonl(IN_CLASSA_NET));
740 else if (IN_CLASSB(i))
741 return (htonl(IN_CLASSB_NET));
742 return (htonl(IN_CLASSC_NET));
743 }
744 #endif
745
746 static u_char srnd[16];
747
748 void
res_rndinit(res_state statp)749 res_rndinit(res_state statp)
750 {
751 struct timeval now;
752 u_int32_t u32;
753 u_int16_t u16;
754 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
755
756 gettimeofday(&now, NULL);
757 u32 = now.tv_sec;
758 memcpy(rnd, &u32, 4);
759 u32 = now.tv_usec;
760 memcpy(rnd + 4, &u32, 4);
761 u32 += now.tv_sec;
762 memcpy(rnd + 8, &u32, 4);
763 u16 = getpid();
764 memcpy(rnd + 12, &u16, 2);
765 }
766
767 u_int
res_nrandomid(res_state statp)768 res_nrandomid(res_state statp) {
769 struct timeval now;
770 u_int16_t u16;
771 MD5_CTX ctx;
772 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
773
774 gettimeofday(&now, NULL);
775 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
776 memcpy(rnd + 14, &u16, 2);
777 #ifndef HAVE_MD5
778 MD5_Init(&ctx);
779 MD5_Update(&ctx, rnd, 16);
780 MD5_Final(rnd, &ctx);
781 #else
782 MD5Init(&ctx);
783 MD5Update(&ctx, rnd, 16);
784 MD5Final(rnd, &ctx);
785 #endif
786 memcpy(&u16, rnd + 14, 2);
787 return ((u_int) u16);
788 }
789
790 /*%
791 * This routine is for closing the socket if a virtual circuit is used and
792 * the program wants to close it. This provides support for endhostent()
793 * which expects to close the socket.
794 *
795 * This routine is not expected to be user visible.
796 */
797 void
res_nclose(res_state statp)798 res_nclose(res_state statp) {
799 int ns;
800
801 if (statp->_vcsock >= 0) {
802 (void) _close(statp->_vcsock);
803 statp->_vcsock = -1;
804 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
805 }
806 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
807 if (statp->_u._ext.nssocks[ns] != -1) {
808 (void) _close(statp->_u._ext.nssocks[ns]);
809 statp->_u._ext.nssocks[ns] = -1;
810 }
811 }
812 }
813
814 void
res_ndestroy(res_state statp)815 res_ndestroy(res_state statp) {
816 res_nclose(statp);
817 if (statp->_u._ext.ext != NULL) {
818 free(statp->_u._ext.ext);
819 statp->_u._ext.ext = NULL;
820 }
821 if (statp->_rnd != NULL) {
822 free(statp->_rnd);
823 statp->_rnd = NULL;
824 }
825 statp->options &= ~RES_INIT;
826 }
827
828 #ifndef _LIBC
829 const char *
res_get_nibblesuffix(res_state statp)830 res_get_nibblesuffix(res_state statp) {
831 if (statp->_u._ext.ext)
832 return (statp->_u._ext.ext->nsuffix);
833 return ("ip6.arpa");
834 }
835
836 const char *
res_get_nibblesuffix2(res_state statp)837 res_get_nibblesuffix2(res_state statp) {
838 if (statp->_u._ext.ext)
839 return (statp->_u._ext.ext->nsuffix2);
840 return ("ip6.int");
841 }
842 #endif
843
844 void
res_setservers(res_state statp,const union res_sockaddr_union * set,int cnt)845 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
846 int i, nserv;
847 size_t size;
848
849 /* close open servers */
850 res_nclose(statp);
851
852 /* cause rtt times to be forgotten */
853 statp->_u._ext.nscount = 0;
854
855 nserv = 0;
856 for (i = 0; i < cnt && nserv < MAXNS; i++) {
857 switch (set->sin.sin_family) {
858 case AF_INET:
859 size = sizeof(set->sin);
860 if (statp->_u._ext.ext)
861 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
862 &set->sin, size);
863 if (size <= sizeof(statp->nsaddr_list[nserv]))
864 memcpy(&statp->nsaddr_list[nserv],
865 &set->sin, size);
866 else
867 statp->nsaddr_list[nserv].sin_family = 0;
868 nserv++;
869 break;
870
871 #ifdef HAS_INET6_STRUCTS
872 case AF_INET6:
873 size = sizeof(set->sin6);
874 if (statp->_u._ext.ext)
875 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
876 &set->sin6, size);
877 if (size <= sizeof(statp->nsaddr_list[nserv]))
878 memcpy(&statp->nsaddr_list[nserv],
879 &set->sin6, size);
880 else
881 statp->nsaddr_list[nserv].sin_family = 0;
882 nserv++;
883 break;
884 #endif
885
886 default:
887 break;
888 }
889 set++;
890 }
891 statp->nscount = nserv;
892
893 }
894
895 int
res_getservers(res_state statp,union res_sockaddr_union * set,int cnt)896 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
897 int i;
898 size_t size;
899 u_int16_t family;
900
901 for (i = 0; i < statp->nscount && i < cnt; i++) {
902 if (statp->_u._ext.ext)
903 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
904 else
905 family = statp->nsaddr_list[i].sin_family;
906
907 switch (family) {
908 case AF_INET:
909 size = sizeof(set->sin);
910 if (statp->_u._ext.ext)
911 memcpy(&set->sin,
912 &statp->_u._ext.ext->nsaddrs[i],
913 size);
914 else
915 memcpy(&set->sin, &statp->nsaddr_list[i],
916 size);
917 break;
918
919 #ifdef HAS_INET6_STRUCTS
920 case AF_INET6:
921 size = sizeof(set->sin6);
922 if (statp->_u._ext.ext)
923 memcpy(&set->sin6,
924 &statp->_u._ext.ext->nsaddrs[i],
925 size);
926 else
927 memcpy(&set->sin6, &statp->nsaddr_list[i],
928 size);
929 break;
930 #endif
931
932 default:
933 set->sin.sin_family = 0;
934 break;
935 }
936 set++;
937 }
938 return (statp->nscount);
939 }
940
941 /*! \file */
942