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