1 /*
2 * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4
5
6 /*
7 * Copyright (c) 1985, 1989, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 /*
40 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
41 *
42 * Permission to use, copy, modify, and distribute this software for any
43 * purpose with or without fee is hereby granted, provided that the above
44 * copyright notice and this permission notice appear in all copies, and that
45 * the name of Digital Equipment Corporation not be used in advertising or
46 * publicity pertaining to distribution of the document or software without
47 * specific, written prior permission.
48 *
49 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
50 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
51 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
52 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
53 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
54 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
55 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
56 * SOFTWARE.
57 */
58
59 /*
60 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
61 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
62 *
63 * Permission to use, copy, modify, and distribute this software for any
64 * purpose with or without fee is hereby granted, provided that the above
65 * copyright notice and this permission notice appear in all copies.
66 *
67 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
68 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
69 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
70 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
71 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
72 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
73 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
74 */
75
76 #include "port_before.h"
77
78 #include <sys/types.h>
79 #include <sys/param.h>
80 #include <sys/socket.h>
81 #include <sys/time.h>
82
83 #include <netinet/in.h>
84 #include <arpa/inet.h>
85 #include <arpa/nameser.h>
86
87 #include <ctype.h>
88 #include <stdio.h>
89 #include <stdlib.h>
90 #include <string.h>
91 #include <unistd.h>
92 #include <netdb.h>
93
94 #ifndef HAVE_MD5
95 # include "../dst/md5.h"
96 #else
97 # ifdef SOLARIS2
98 # include <sys/md5.h>
99 # endif
100 #endif
101 #ifndef _MD5_H_
102 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
103 #endif
104
105
106 #include "port_after.h"
107
108 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
109 #include <resolv.h>
110
111 /* ISC purposely put port_after.h before <resolv.h> to force in6 stuff
112 * (above) so we explicitly include port_resolv.h here */
113 #include "port_resolv.h"
114
115 #include "res_private.h"
116
117 /*% Options. Should all be left alone. */
118 #define RESOLVSORT
119 #define DEBUG
120
121 #ifdef SUNW_INITCHKIF
122 #include <net/if.h>
123 #include <netinet/if_ether.h>
124 #include <sys/sockio.h>
125 #define MAXIFS 8192
126 #endif /* SUNW_INITCHKIF */
127
128 #ifdef SOLARIS2
129 #include <sys/systeminfo.h>
130 #endif
131
132 static void res_setoptions __P((res_state, const char *, const char *));
133
134 #ifdef RESOLVSORT
135 static const char sort_mask[] = "/&";
136 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
137 static u_int32_t net_mask __P((struct in_addr));
138 #endif
139
140 #if !defined(isascii) /*%< XXX - could be a function */
141 # define isascii(c) (!(c & 0200))
142 #endif
143
144 /*
145 * Resolver state default settings.
146 */
147
148 /*%
149 * Set up default settings. If the configuration file exist, the values
150 * there will have precedence. Otherwise, the server address is set to
151 * INADDR_ANY and the default domain name comes from the gethostname().
152 *
153 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
154 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
155 * since it was noted that INADDR_ANY actually meant ``the first interface
156 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
157 * it had to be "up" in order for you to reach your own name server. It
158 * was later decided that since the recommended practice is to always
159 * install local static routes through 127.0.0.1 for all your network
160 * interfaces, that we could solve this problem without a code change.
161 *
162 * The configuration file should always be used, since it is the only way
163 * to specify a default domain. If you are running a server on your local
164 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
165 * in the configuration file.
166 *
167 * Return 0 if completes successfully, -1 on error
168 */
169 int
res_ninit(res_state statp)170 res_ninit(res_state statp) {
171 extern int __res_vinit(res_state, int);
172 return (__res_vinit(statp, 0));
173 }
174
175 /*% This function has to be reachable by res_data.c but not publically. */
176 int
__res_vinit(res_state statp,int preinit)177 __res_vinit(res_state statp, int preinit) {
178 register FILE *fp;
179 register char *cp, **pp;
180 register int n;
181 char buf[BUFSIZ];
182 int nserv = 0; /*%< number of nameserver records read from file */
183 int haveenv = 0;
184 int havesearch = 0;
185 #ifdef RESOLVSORT
186 int nsort = 0;
187 char *net;
188 #endif
189 int dots;
190 union res_sockaddr_union u[2];
191 int maxns = MAXNS;
192
193 RES_SET_H_ERRNO(statp, 0);
194 if (statp->_u._ext.ext != NULL)
195 res_ndestroy(statp);
196
197 if (!preinit) {
198 statp->retrans = RES_TIMEOUT;
199 statp->retry = RES_DFLRETRY;
200 statp->options = RES_DEFAULT;
201 res_rndinit(statp);
202 statp->id = res_nrandomid(statp);
203 }
204
205 memset(u, 0, sizeof(u));
206 #ifdef USELOOPBACK
207 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
208 #else
209 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
210 #endif
211 u[nserv].sin.sin_family = AF_INET;
212 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
213 #ifdef HAVE_SA_LEN
214 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
215 #endif
216 nserv++;
217 #ifdef HAS_INET6_STRUCTS
218 #ifdef USELOOPBACK
219 u[nserv].sin6.sin6_addr = in6addr_loopback;
220 #else
221 u[nserv].sin6.sin6_addr = in6addr_any;
222 #endif
223 u[nserv].sin6.sin6_family = AF_INET6;
224 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
225 #ifdef HAVE_SA_LEN
226 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
227 #endif
228 nserv++;
229 #endif
230 statp->nscount = 0;
231 statp->ndots = 1;
232 statp->pfcode = 0;
233 statp->_vcsock = -1;
234 statp->_flags = 0;
235 statp->qhook = NULL;
236 statp->rhook = NULL;
237 statp->_u._ext.nscount = 0;
238 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
239 if (statp->_u._ext.ext != NULL) {
240 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
241 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
242 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
243 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
244 } else {
245 /*
246 * Historically res_init() rarely, if at all, failed.
247 * Examples and applications exist which do not check
248 * our return code. Furthermore several applications
249 * simply call us to get the systems domainname. So
250 * rather then immediately fail here we store the
251 * failure, which is returned later, in h_errno. And
252 * prevent the collection of 'nameserver' information
253 * by setting maxns to 0. Thus applications that fail
254 * to check our return code wont be able to make
255 * queries anyhow.
256 */
257 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
258 maxns = 0;
259 }
260 #ifdef RESOLVSORT
261 statp->nsort = 0;
262 #endif
263 res_setservers(statp, u, nserv);
264
265 #ifdef SUNW_INITCHKIF
266 /*
267 * Short circuit res_init() if no non-loopback interfaces are up. This is
268 * done to avoid boot delays if "dns" comes before "files" in nsswitch.conf.
269 * An additional fix has been added to this code, to count all external
270 * interfaces, which includes the IPv6 interfaces. If no external interfaces
271 * are found, an additional check is carried out to determine if any deprecated
272 * interfaces are up.
273 */
274 {
275 int s;
276 struct lifnum lifn;
277
278 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
279 perror("res_init: socket");
280 goto freedata;
281 }
282 lifn.lifn_family = AF_UNSPEC;
283 lifn.lifn_flags = LIFC_EXTERNAL_SOURCE;
284 if (ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) {
285 close(s);
286 goto freedata;
287 }
288 if (lifn.lifn_count == 0) {
289 /*
290 * Check if there are any deprecated interfaces up
291 */
292 struct lifconf lifc;
293 uchar_t *buf;
294 int buflen, i, int_up = 0;
295
296 lifn.lifn_flags = 0;
297 if ((ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) ||
298 (lifn.lifn_count < 1)) {
299 close(s);
300 goto freedata;
301 }
302
303 buflen = lifn.lifn_count * sizeof (struct lifreq);
304 buf = (uchar_t *)malloc(buflen);
305 if (buf == NULL) {
306 close(s);
307 goto freedata;
308 }
309
310 lifc.lifc_family = AF_UNSPEC;
311 lifc.lifc_flags = 0;
312 lifc.lifc_len = buflen;
313 lifc.lifc_lifcu.lifcu_buf = (caddr_t)buf;
314 if (ioctl(s, SIOCGLIFCONF, (char *)&lifc) < 0) {
315 close(s);
316 free(buf);
317 goto freedata;
318 }
319
320 for (i = 0; i < lifn.lifn_count; ++i) {
321 struct lifreq *lreqp, lreq;
322
323 lreqp = (struct lifreq *)&lifc.lifc_req[i];
324 strlcpy(lreq.lifr_name, lreqp->lifr_name,
325 sizeof (lreq.lifr_name));
326 if (ioctl(s, SIOCGLIFFLAGS, &lreq) < 0) {
327 close(s);
328 free(buf);
329 goto freedata;
330 }
331 if ((lreq.lifr_flags & IFF_UP) &&
332 !(lreq.lifr_flags & IFF_NOLOCAL) &&
333 !(lreq.lifr_flags & IFF_NOXMIT) &&
334 !(lreq.lifr_flags & IFF_LOOPBACK)) {
335 int_up = 1;
336 break;
337 }
338 }
339 free(buf);
340
341 if (!int_up) {
342 close(s);
343 goto freedata;
344 }
345 }
346 close(s);
347 }
348 #endif /* SUNW_INITCHKIF */
349
350 #ifdef SOLARIS2
351 /*
352 * The old libresolv derived the defaultdomain from NIS/NIS+.
353 * We want to keep this behaviour
354 */
355 {
356 char buf[sizeof(statp->defdname)], *cp;
357 int ret;
358
359 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
360 (unsigned int)ret <= sizeof(buf)) {
361 if (buf[0] == '+')
362 buf[0] = '.';
363 cp = strchr(buf, '.');
364 cp = (cp == NULL) ? buf : (cp + 1);
365 strncpy(statp->defdname, cp,
366 sizeof(statp->defdname) - 1);
367 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
368 }
369 }
370 #endif /* SOLARIS2 */
371
372 /* Allow user to override the local domain definition */
373 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
374 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
375 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
376 haveenv++;
377
378 /*
379 * Set search list to be blank-separated strings
380 * from rest of env value. Permits users of LOCALDOMAIN
381 * to still have a search list, and anyone to set the
382 * one that they want to use as an individual (even more
383 * important now that the rfc1535 stuff restricts searches)
384 */
385 cp = statp->defdname;
386 pp = statp->dnsrch;
387 *pp++ = cp;
388 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
389 if (*cp == '\n') /*%< silly backwards compat */
390 break;
391 else if (*cp == ' ' || *cp == '\t') {
392 *cp = 0;
393 n = 1;
394 } else if (n) {
395 *pp++ = cp;
396 n = 0;
397 havesearch = 1;
398 }
399 }
400 /* null terminate last domain if there are excess */
401 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
402 cp++;
403 *cp = '\0';
404 *pp++ = 0;
405 }
406
407 #define MATCH(line, name) \
408 (!strncmp(line, name, sizeof(name) - 1) && \
409 (line[sizeof(name) - 1] == ' ' || \
410 line[sizeof(name) - 1] == '\t'))
411
412 nserv = 0;
413 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
414 /* read the config file */
415 while (fgets(buf, sizeof(buf), fp) != NULL) {
416 /* skip comments */
417 if (*buf == ';' || *buf == '#')
418 continue;
419 /* read default domain name */
420 if (MATCH(buf, "domain")) {
421 if (haveenv) /*%< skip if have from environ */
422 continue;
423 cp = buf + sizeof("domain") - 1;
424 while (*cp == ' ' || *cp == '\t')
425 cp++;
426 if ((*cp == '\0') || (*cp == '\n'))
427 continue;
428 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
429 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
430 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
431 *cp = '\0';
432 havesearch = 0;
433 continue;
434 }
435 /* set search list */
436 if (MATCH(buf, "search")) {
437 if (haveenv) /*%< skip if have from environ */
438 continue;
439 cp = buf + sizeof("search") - 1;
440 while (*cp == ' ' || *cp == '\t')
441 cp++;
442 if ((*cp == '\0') || (*cp == '\n'))
443 continue;
444 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
445 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
446 if ((cp = strchr(statp->defdname, '\n')) != NULL)
447 *cp = '\0';
448 /*
449 * Set search list to be blank-separated strings
450 * on rest of line.
451 */
452 cp = statp->defdname;
453 pp = statp->dnsrch;
454 *pp++ = cp;
455 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
456 if (*cp == ' ' || *cp == '\t') {
457 *cp = 0;
458 n = 1;
459 } else if (n) {
460 *pp++ = cp;
461 n = 0;
462 }
463 }
464 /* null terminate last domain if there are excess */
465 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
466 cp++;
467 *cp = '\0';
468 *pp++ = 0;
469 havesearch = 1;
470 continue;
471 }
472 /* read nameservers to query */
473 if (MATCH(buf, "nameserver") && nserv < maxns) {
474 struct addrinfo hints, *ai;
475 char sbuf[NI_MAXSERV];
476 const size_t minsiz =
477 sizeof(statp->_u._ext.ext->nsaddrs[0]);
478
479 cp = buf + sizeof("nameserver") - 1;
480 while (*cp == ' ' || *cp == '\t')
481 cp++;
482 cp[strcspn(cp, ";# \t\n")] = '\0';
483 if ((*cp != '\0') && (*cp != '\n')) {
484 memset(&hints, 0, sizeof(hints));
485 hints.ai_family = PF_UNSPEC;
486 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
487 hints.ai_flags = AI_NUMERICHOST;
488 sprintf(sbuf, "%u", NAMESERVER_PORT);
489 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
490 ai->ai_addrlen <= minsiz) {
491 if (statp->_u._ext.ext != NULL) {
492 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
493 ai->ai_addr, ai->ai_addrlen);
494 }
495 if (ai->ai_addrlen <=
496 sizeof(statp->nsaddr_list[nserv])) {
497 memcpy(&statp->nsaddr_list[nserv],
498 ai->ai_addr, ai->ai_addrlen);
499 } else
500 statp->nsaddr_list[nserv].sin_family = 0;
501 freeaddrinfo(ai);
502 nserv++;
503 }
504 }
505 continue;
506 }
507 #ifdef RESOLVSORT
508 if (MATCH(buf, "sortlist")) {
509 struct in_addr a;
510
511 cp = buf + sizeof("sortlist") - 1;
512 while (nsort < MAXRESOLVSORT) {
513 while (*cp == ' ' || *cp == '\t')
514 cp++;
515 if (*cp == '\0' || *cp == '\n' || *cp == ';')
516 break;
517 net = cp;
518 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
519 isascii(*cp) && !isspace((unsigned char)*cp))
520 cp++;
521 n = *cp;
522 *cp = 0;
523 if (inet_aton(net, &a)) {
524 statp->sort_list[nsort].addr = a;
525 if (ISSORTMASK(n)) {
526 *cp++ = n;
527 net = cp;
528 while (*cp && *cp != ';' &&
529 isascii(*cp) &&
530 !isspace((unsigned char)*cp))
531 cp++;
532 n = *cp;
533 *cp = 0;
534 if (inet_aton(net, &a)) {
535 statp->sort_list[nsort].mask = a.s_addr;
536 } else {
537 statp->sort_list[nsort].mask =
538 net_mask(statp->sort_list[nsort].addr);
539 }
540 } else {
541 statp->sort_list[nsort].mask =
542 net_mask(statp->sort_list[nsort].addr);
543 }
544 nsort++;
545 }
546 *cp = n;
547 }
548 continue;
549 }
550 #endif
551 if (MATCH(buf, "options")) {
552 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
553 continue;
554 }
555 }
556 if (nserv > 0)
557 statp->nscount = nserv;
558 #ifdef RESOLVSORT
559 statp->nsort = nsort;
560 #endif
561 (void) fclose(fp);
562 }
563 /*
564 * Last chance to get a nameserver. This should not normally
565 * be necessary
566 */
567 #ifdef NO_RESOLV_CONF
568 if(nserv == 0)
569 nserv = get_nameservers(statp);
570 #endif
571
572 if (statp->defdname[0] == 0 &&
573 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
574 (cp = strchr(buf, '.')) != NULL)
575 strcpy(statp->defdname, cp + 1);
576
577 /* find components of local domain that might be searched */
578 if (havesearch == 0) {
579 pp = statp->dnsrch;
580 *pp++ = statp->defdname;
581 *pp = NULL;
582
583 dots = 0;
584 for (cp = statp->defdname; *cp; cp++)
585 dots += (*cp == '.');
586
587 cp = statp->defdname;
588 while (pp < statp->dnsrch + MAXDFLSRCH) {
589 if (dots < LOCALDOMAINPARTS)
590 break;
591 cp = strchr(cp, '.') + 1; /*%< we know there is one */
592 *pp++ = cp;
593 dots--;
594 }
595 *pp = NULL;
596 #ifdef DEBUG
597 if (statp->options & RES_DEBUG) {
598 printf(";; res_init()... default dnsrch list:\n");
599 for (pp = statp->dnsrch; *pp; pp++)
600 printf(";;\t%s\n", *pp);
601 printf(";;\t..END..\n");
602 }
603 #endif
604 }
605
606 if ((cp = getenv("RES_OPTIONS")) != NULL)
607 res_setoptions(statp, cp, "env");
608 statp->options |= RES_INIT;
609 return (statp->res_h_errno);
610 #ifdef SUNW_INITCHKIF
611 freedata:
612 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
613 if (statp->_u._ext.ext != NULL) {
614 free(statp->_u._ext.ext);
615 statp->_u._ext.ext = NULL;
616 }
617 return (-1);
618 #endif /* SUNW_INITCHKIF */
619
620 }
621
622 static void
res_setoptions(res_state statp,const char * options,const char * source)623 res_setoptions(res_state statp, const char *options, const char *source)
624 {
625 const char *cp = options;
626 int i;
627 struct __res_state_ext *ext = statp->_u._ext.ext;
628
629 #ifdef DEBUG
630 if (statp->options & RES_DEBUG)
631 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
632 options, source);
633 #endif
634 while (*cp) {
635 /* skip leading and inner runs of spaces */
636 while (*cp == ' ' || *cp == '\t')
637 cp++;
638 /* search for and process individual options */
639 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
640 i = atoi(cp + sizeof("ndots:") - 1);
641 if (i <= RES_MAXNDOTS)
642 statp->ndots = i;
643 else
644 statp->ndots = RES_MAXNDOTS;
645 #ifdef DEBUG
646 if (statp->options & RES_DEBUG)
647 printf(";;\tndots=%d\n", statp->ndots);
648 #endif
649 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
650 i = atoi(cp + sizeof("timeout:") - 1);
651 if (i <= RES_MAXRETRANS)
652 statp->retrans = i;
653 else
654 statp->retrans = RES_MAXRETRANS;
655 #ifdef DEBUG
656 if (statp->options & RES_DEBUG)
657 printf(";;\ttimeout=%d\n", statp->retrans);
658 #endif
659 #ifdef SOLARIS2
660 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
661 /*
662 * For backward compatibility, 'retrans' is
663 * supported as an alias for 'timeout', though
664 * without an imposed maximum.
665 */
666 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
667 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
668 /*
669 * For backward compatibility, 'retry' is
670 * supported as an alias for 'attempts', though
671 * without an imposed maximum.
672 */
673 statp->retry = atoi(cp + sizeof("retry:") - 1);
674 #endif /* SOLARIS2 */
675 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
676 i = atoi(cp + sizeof("attempts:") - 1);
677 if (i <= RES_MAXRETRY)
678 statp->retry = i;
679 else
680 statp->retry = RES_MAXRETRY;
681 #ifdef DEBUG
682 if (statp->options & RES_DEBUG)
683 printf(";;\tattempts=%d\n", statp->retry);
684 #endif
685 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
686 #ifdef DEBUG
687 if (!(statp->options & RES_DEBUG)) {
688 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
689 options, source);
690 statp->options |= RES_DEBUG;
691 }
692 printf(";;\tdebug\n");
693 #endif
694 } else if (!strncmp(cp, "no_tld_query",
695 sizeof("no_tld_query") - 1) ||
696 !strncmp(cp, "no-tld-query",
697 sizeof("no-tld-query") - 1)) {
698 statp->options |= RES_NOTLDQUERY;
699 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
700 statp->options |= RES_USE_INET6;
701 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
702 statp->options |= RES_ROTATE;
703 } else if (!strncmp(cp, "no-check-names",
704 sizeof("no-check-names") - 1)) {
705 statp->options |= RES_NOCHECKNAME;
706 }
707 #ifdef RES_USE_EDNS0
708 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
709 statp->options |= RES_USE_EDNS0;
710 }
711 #endif
712 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
713 statp->options |= RES_USE_DNAME;
714 }
715 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
716 if (ext == NULL)
717 goto skip;
718 cp += sizeof("nibble:") - 1;
719 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
720 strncpy(ext->nsuffix, cp, i);
721 ext->nsuffix[i] = '\0';
722 }
723 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
724 if (ext == NULL)
725 goto skip;
726 cp += sizeof("nibble2:") - 1;
727 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
728 strncpy(ext->nsuffix2, cp, i);
729 ext->nsuffix2[i] = '\0';
730 }
731 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
732 cp += sizeof("v6revmode:") - 1;
733 /* "nibble" and "bitstring" used to be valid */
734 if (!strncmp(cp, "single", sizeof("single") - 1)) {
735 statp->options |= RES_NO_NIBBLE2;
736 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
737 statp->options &=
738 ~RES_NO_NIBBLE2;
739 }
740 }
741 else {
742 /* XXX - print a warning here? */
743 }
744 skip:
745 /* skip to next run of spaces */
746 while (*cp && *cp != ' ' && *cp != '\t')
747 cp++;
748 }
749 }
750
751 #ifdef RESOLVSORT
752 /* XXX - should really support CIDR which means explicit masks always. */
753 static u_int32_t
net_mask(in)754 net_mask(in) /*!< XXX - should really use system's version of this */
755 struct in_addr in;
756 {
757 register u_int32_t i = ntohl(in.s_addr);
758
759 if (IN_CLASSA(i))
760 return (htonl(IN_CLASSA_NET));
761 else if (IN_CLASSB(i))
762 return (htonl(IN_CLASSB_NET));
763 return (htonl(IN_CLASSC_NET));
764 }
765 #endif
766
767 void
res_rndinit(res_state statp)768 res_rndinit(res_state statp)
769 {
770 struct timeval now;
771 u_int32_t u32;
772 u_int16_t u16;
773
774 gettimeofday(&now, NULL);
775 u32 = now.tv_sec;
776 memcpy(statp->_u._ext._rnd, &u32, 4);
777 u32 = now.tv_usec;
778 memcpy(statp->_u._ext._rnd + 4, &u32, 4);
779 u32 += now.tv_sec;
780 memcpy(statp->_u._ext._rnd + 8, &u32, 4);
781 u16 = getpid();
782 memcpy(statp->_u._ext._rnd + 12, &u16, 2);
783
784 }
785
786 u_int
res_nrandomid(res_state statp)787 res_nrandomid(res_state statp) {
788 struct timeval now;
789 u_int16_t u16;
790 MD5_CTX ctx;
791
792 gettimeofday(&now, NULL);
793 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
794
795 memcpy(statp->_u._ext._rnd + 14, &u16, 2);
796 #ifndef HAVE_MD5
797 MD5_Init(&ctx);
798 MD5_Update(&ctx, statp->_u._ext._rnd, 16);
799 MD5_Final(statp->_u._ext._rnd, &ctx);
800 #else
801 MD5Init(&ctx);
802 MD5Update(&ctx, statp->_u._ext._rnd, 16);
803 MD5Final(statp->_u._ext._rnd, &ctx);
804 #endif
805 memcpy(&u16, statp->_u._ext._rnd + 14, 2);
806 return ((u_int) u16);
807 }
808
809 /*%
810 * This routine is for closing the socket if a virtual circuit is used and
811 * the program wants to close it. This provides support for endhostent()
812 * which expects to close the socket.
813 *
814 * This routine is not expected to be user visible.
815 */
816 void
res_nclose(res_state statp)817 res_nclose(res_state statp) {
818 int ns;
819
820 if (statp->_vcsock >= 0) {
821 (void) close(statp->_vcsock);
822 statp->_vcsock = -1;
823 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
824 }
825 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
826 if (statp->_u._ext.nssocks[ns] != -1) {
827 (void) close(statp->_u._ext.nssocks[ns]);
828 statp->_u._ext.nssocks[ns] = -1;
829 }
830 }
831 }
832
833 void
res_ndestroy(res_state statp)834 res_ndestroy(res_state statp) {
835 res_nclose(statp);
836 if (statp->_u._ext.ext != NULL)
837 free(statp->_u._ext.ext);
838 statp->options &= ~RES_INIT;
839 statp->_u._ext.ext = NULL;
840 }
841
842 const char *
res_get_nibblesuffix(res_state statp)843 res_get_nibblesuffix(res_state statp) {
844 if (statp->_u._ext.ext)
845 return (statp->_u._ext.ext->nsuffix);
846 return ("ip6.arpa");
847 }
848
849 const char *
res_get_nibblesuffix2(res_state statp)850 res_get_nibblesuffix2(res_state statp) {
851 if (statp->_u._ext.ext)
852 return (statp->_u._ext.ext->nsuffix2);
853 return ("ip6.int");
854 }
855
856 void
res_setservers(res_state statp,const union res_sockaddr_union * set,int cnt)857 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
858 int i, nserv;
859 size_t size;
860
861 /* close open servers */
862 res_nclose(statp);
863
864 /* cause rtt times to be forgotten */
865 statp->_u._ext.nscount = 0;
866
867 nserv = 0;
868 for (i = 0; i < cnt && nserv < MAXNS; i++) {
869 switch (set->sin.sin_family) {
870 case AF_INET:
871 size = sizeof(set->sin);
872 if (statp->_u._ext.ext)
873 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
874 &set->sin, size);
875 if (size <= sizeof(statp->nsaddr_list[nserv]))
876 memcpy(&statp->nsaddr_list[nserv],
877 &set->sin, size);
878 else
879 statp->nsaddr_list[nserv].sin_family = 0;
880 nserv++;
881 break;
882
883 #ifdef HAS_INET6_STRUCTS
884 case AF_INET6:
885 size = sizeof(set->sin6);
886 if (statp->_u._ext.ext)
887 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
888 &set->sin6, size);
889 if (size <= sizeof(statp->nsaddr_list[nserv]))
890 memcpy(&statp->nsaddr_list[nserv],
891 &set->sin6, size);
892 else
893 statp->nsaddr_list[nserv].sin_family = 0;
894 nserv++;
895 break;
896 #endif
897
898 default:
899 break;
900 }
901 set++;
902 }
903 statp->nscount = nserv;
904
905 }
906
907 int
res_getservers(res_state statp,union res_sockaddr_union * set,int cnt)908 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
909 int i;
910 size_t size;
911 u_int16_t family;
912
913 for (i = 0; i < statp->nscount && i < cnt; i++) {
914 if (statp->_u._ext.ext)
915 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
916 else
917 family = statp->nsaddr_list[i].sin_family;
918
919 switch (family) {
920 case AF_INET:
921 size = sizeof(set->sin);
922 if (statp->_u._ext.ext)
923 memcpy(&set->sin,
924 &statp->_u._ext.ext->nsaddrs[i],
925 size);
926 else
927 memcpy(&set->sin, &statp->nsaddr_list[i],
928 size);
929 break;
930
931 #ifdef HAS_INET6_STRUCTS
932 case AF_INET6:
933 size = sizeof(set->sin6);
934 if (statp->_u._ext.ext)
935 memcpy(&set->sin6,
936 &statp->_u._ext.ext->nsaddrs[i],
937 size);
938 else
939 memcpy(&set->sin6, &statp->nsaddr_list[i],
940 size);
941 break;
942 #endif
943
944 default:
945 set->sin.sin_family = 0;
946 break;
947 }
948 set++;
949 }
950 return (statp->nscount);
951 }
952
953 /*! \file */
954