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 #if defined(LIBC_SCCS) && !defined(lint)
77 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
78 static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $";
79 #endif /* LIBC_SCCS and not lint */
80
81 #include "port_before.h"
82
83 #include <sys/types.h>
84 #include <sys/param.h>
85 #include <sys/socket.h>
86 #include <sys/time.h>
87
88 #include <netinet/in.h>
89 #include <arpa/inet.h>
90 #include <arpa/nameser.h>
91
92 #include <ctype.h>
93 #include <stdio.h>
94 #include <stdlib.h>
95 #include <string.h>
96 #include <unistd.h>
97 #include <netdb.h>
98
99 #ifndef HAVE_MD5
100 # include "../dst/md5.h"
101 #else
102 # ifdef SOLARIS2
103 # include <sys/md5.h>
104 # endif
105 #endif
106 #ifndef _MD5_H_
107 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
108 #endif
109
110
111 #include "port_after.h"
112
113 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
114 #include <resolv.h>
115
116 /* ISC purposely put port_after.h before <resolv.h> to force in6 stuff
117 * (above) so we explicitly include port_resolv.h here */
118 #include "port_resolv.h"
119
120 #include "res_private.h"
121
122 /*% Options. Should all be left alone. */
123 #define RESOLVSORT
124 #define DEBUG
125
126 #ifdef SUNW_INITCHKIF
127 #include <net/if.h>
128 #include <netinet/if_ether.h>
129 #include <sys/sockio.h>
130 #define MAXIFS 8192
131 #endif /* SUNW_INITCHKIF */
132
133 #ifdef SOLARIS2
134 #include <sys/systeminfo.h>
135 #endif
136
137 static void res_setoptions __P((res_state, const char *, const char *));
138
139 #ifdef RESOLVSORT
140 static const char sort_mask[] = "/&";
141 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
142 static u_int32_t net_mask __P((struct in_addr));
143 #endif
144
145 #if !defined(isascii) /*%< XXX - could be a function */
146 # define isascii(c) (!(c & 0200))
147 #endif
148
149 /*
150 * Resolver state default settings.
151 */
152
153 /*%
154 * Set up default settings. If the configuration file exist, the values
155 * there will have precedence. Otherwise, the server address is set to
156 * INADDR_ANY and the default domain name comes from the gethostname().
157 *
158 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
159 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
160 * since it was noted that INADDR_ANY actually meant ``the first interface
161 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
162 * it had to be "up" in order for you to reach your own name server. It
163 * was later decided that since the recommended practice is to always
164 * install local static routes through 127.0.0.1 for all your network
165 * interfaces, that we could solve this problem without a code change.
166 *
167 * The configuration file should always be used, since it is the only way
168 * to specify a default domain. If you are running a server on your local
169 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
170 * in the configuration file.
171 *
172 * Return 0 if completes successfully, -1 on error
173 */
174 int
res_ninit(res_state statp)175 res_ninit(res_state statp) {
176 extern int __res_vinit(res_state, int);
177 return (__res_vinit(statp, 0));
178 }
179
180 /*% This function has to be reachable by res_data.c but not publically. */
181 int
__res_vinit(res_state statp,int preinit)182 __res_vinit(res_state statp, int preinit) {
183 register FILE *fp;
184 register char *cp, **pp;
185 register int n;
186 char buf[BUFSIZ];
187 int nserv = 0; /*%< number of nameserver records read from file */
188 int haveenv = 0;
189 int havesearch = 0;
190 #ifdef RESOLVSORT
191 int nsort = 0;
192 char *net;
193 #endif
194 int dots;
195 union res_sockaddr_union u[2];
196 int maxns = MAXNS;
197
198 RES_SET_H_ERRNO(statp, 0);
199 if (statp->_u._ext.ext != NULL)
200 res_ndestroy(statp);
201
202 if (!preinit) {
203 statp->retrans = RES_TIMEOUT;
204 statp->retry = RES_DFLRETRY;
205 statp->options = RES_DEFAULT;
206 res_rndinit(statp);
207 statp->id = res_nrandomid(statp);
208 }
209
210 memset(u, 0, sizeof(u));
211 #ifdef USELOOPBACK
212 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
213 #else
214 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
215 #endif
216 u[nserv].sin.sin_family = AF_INET;
217 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
218 #ifdef HAVE_SA_LEN
219 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
220 #endif
221 nserv++;
222 #ifdef HAS_INET6_STRUCTS
223 #ifdef USELOOPBACK
224 u[nserv].sin6.sin6_addr = in6addr_loopback;
225 #else
226 u[nserv].sin6.sin6_addr = in6addr_any;
227 #endif
228 u[nserv].sin6.sin6_family = AF_INET6;
229 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
230 #ifdef HAVE_SA_LEN
231 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
232 #endif
233 nserv++;
234 #endif
235 statp->nscount = 0;
236 statp->ndots = 1;
237 statp->pfcode = 0;
238 statp->_vcsock = -1;
239 statp->_flags = 0;
240 statp->qhook = NULL;
241 statp->rhook = NULL;
242 statp->_u._ext.nscount = 0;
243 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
244 if (statp->_u._ext.ext != NULL) {
245 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
246 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
247 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
248 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
249 } else {
250 /*
251 * Historically res_init() rarely, if at all, failed.
252 * Examples and applications exist which do not check
253 * our return code. Furthermore several applications
254 * simply call us to get the systems domainname. So
255 * rather then immediately fail here we store the
256 * failure, which is returned later, in h_errno. And
257 * prevent the collection of 'nameserver' information
258 * by setting maxns to 0. Thus applications that fail
259 * to check our return code wont be able to make
260 * queries anyhow.
261 */
262 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
263 maxns = 0;
264 }
265 #ifdef RESOLVSORT
266 statp->nsort = 0;
267 #endif
268 res_setservers(statp, u, nserv);
269
270 #ifdef SUNW_INITCHKIF
271 /*
272 * Short circuit res_init() if no non-loopback interfaces are up. This is
273 * done to avoid boot delays if "dns" comes before "files" in nsswitch.conf.
274 * An additional fix has been added to this code, to count all external
275 * interfaces, which includes the IPv6 interfaces. If no external interfaces
276 * are found, an additional check is carried out to determine if any deprecated
277 * interfaces are up.
278 */
279 {
280 int s;
281 struct lifnum lifn;
282
283 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
284 perror("res_init: socket");
285 goto freedata;
286 }
287 lifn.lifn_family = AF_UNSPEC;
288 lifn.lifn_flags = LIFC_EXTERNAL_SOURCE;
289 if (ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) {
290 close(s);
291 goto freedata;
292 }
293 if (lifn.lifn_count == 0) {
294 /*
295 * Check if there are any deprecated interfaces up
296 */
297 struct lifconf lifc;
298 uchar_t *buf;
299 int buflen, i, int_up = 0;
300
301 lifn.lifn_flags = 0;
302 if ((ioctl(s, SIOCGLIFNUM, (char *)&lifn) < 0) ||
303 (lifn.lifn_count < 1)) {
304 close(s);
305 goto freedata;
306 }
307
308 buflen = lifn.lifn_count * sizeof (struct lifreq);
309 buf = (uchar_t *)malloc(buflen);
310 if (buf == NULL) {
311 close(s);
312 goto freedata;
313 }
314
315 lifc.lifc_family = AF_UNSPEC;
316 lifc.lifc_flags = 0;
317 lifc.lifc_len = buflen;
318 lifc.lifc_lifcu.lifcu_buf = (caddr_t)buf;
319 if (ioctl(s, SIOCGLIFCONF, (char *)&lifc) < 0) {
320 close(s);
321 free(buf);
322 goto freedata;
323 }
324
325 for (i = 0; i < lifn.lifn_count; ++i) {
326 struct lifreq *lreqp, lreq;
327
328 lreqp = (struct lifreq *)&lifc.lifc_req[i];
329 strlcpy(lreq.lifr_name, lreqp->lifr_name,
330 sizeof (lreq.lifr_name));
331 if (ioctl(s, SIOCGLIFFLAGS, &lreq) < 0) {
332 close(s);
333 free(buf);
334 goto freedata;
335 }
336 if ((lreq.lifr_flags & IFF_UP) &&
337 !(lreq.lifr_flags & IFF_NOLOCAL) &&
338 !(lreq.lifr_flags & IFF_NOXMIT) &&
339 !(lreq.lifr_flags & IFF_LOOPBACK)) {
340 int_up = 1;
341 break;
342 }
343 }
344 free(buf);
345
346 if (!int_up) {
347 close(s);
348 goto freedata;
349 }
350 }
351 close(s);
352 }
353 #endif /* SUNW_INITCHKIF */
354
355 #ifdef SOLARIS2
356 /*
357 * The old libresolv derived the defaultdomain from NIS/NIS+.
358 * We want to keep this behaviour
359 */
360 {
361 char buf[sizeof(statp->defdname)], *cp;
362 int ret;
363
364 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
365 (unsigned int)ret <= sizeof(buf)) {
366 if (buf[0] == '+')
367 buf[0] = '.';
368 cp = strchr(buf, '.');
369 cp = (cp == NULL) ? buf : (cp + 1);
370 strncpy(statp->defdname, cp,
371 sizeof(statp->defdname) - 1);
372 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
373 }
374 }
375 #endif /* SOLARIS2 */
376
377 /* Allow user to override the local domain definition */
378 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
379 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
380 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
381 haveenv++;
382
383 /*
384 * Set search list to be blank-separated strings
385 * from rest of env value. Permits users of LOCALDOMAIN
386 * to still have a search list, and anyone to set the
387 * one that they want to use as an individual (even more
388 * important now that the rfc1535 stuff restricts searches)
389 */
390 cp = statp->defdname;
391 pp = statp->dnsrch;
392 *pp++ = cp;
393 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
394 if (*cp == '\n') /*%< silly backwards compat */
395 break;
396 else if (*cp == ' ' || *cp == '\t') {
397 *cp = 0;
398 n = 1;
399 } else if (n) {
400 *pp++ = cp;
401 n = 0;
402 havesearch = 1;
403 }
404 }
405 /* null terminate last domain if there are excess */
406 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
407 cp++;
408 *cp = '\0';
409 *pp++ = 0;
410 }
411
412 #define MATCH(line, name) \
413 (!strncmp(line, name, sizeof(name) - 1) && \
414 (line[sizeof(name) - 1] == ' ' || \
415 line[sizeof(name) - 1] == '\t'))
416
417 nserv = 0;
418 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
419 /* read the config file */
420 while (fgets(buf, sizeof(buf), fp) != NULL) {
421 /* skip comments */
422 if (*buf == ';' || *buf == '#')
423 continue;
424 /* read default domain name */
425 if (MATCH(buf, "domain")) {
426 if (haveenv) /*%< skip if have from environ */
427 continue;
428 cp = buf + sizeof("domain") - 1;
429 while (*cp == ' ' || *cp == '\t')
430 cp++;
431 if ((*cp == '\0') || (*cp == '\n'))
432 continue;
433 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
434 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
435 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
436 *cp = '\0';
437 havesearch = 0;
438 continue;
439 }
440 /* set search list */
441 if (MATCH(buf, "search")) {
442 if (haveenv) /*%< skip if have from environ */
443 continue;
444 cp = buf + sizeof("search") - 1;
445 while (*cp == ' ' || *cp == '\t')
446 cp++;
447 if ((*cp == '\0') || (*cp == '\n'))
448 continue;
449 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
450 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
451 if ((cp = strchr(statp->defdname, '\n')) != NULL)
452 *cp = '\0';
453 /*
454 * Set search list to be blank-separated strings
455 * on rest of line.
456 */
457 cp = statp->defdname;
458 pp = statp->dnsrch;
459 *pp++ = cp;
460 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
461 if (*cp == ' ' || *cp == '\t') {
462 *cp = 0;
463 n = 1;
464 } else if (n) {
465 *pp++ = cp;
466 n = 0;
467 }
468 }
469 /* null terminate last domain if there are excess */
470 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
471 cp++;
472 *cp = '\0';
473 *pp++ = 0;
474 havesearch = 1;
475 continue;
476 }
477 /* read nameservers to query */
478 if (MATCH(buf, "nameserver") && nserv < maxns) {
479 struct addrinfo hints, *ai;
480 char sbuf[NI_MAXSERV];
481 const size_t minsiz =
482 sizeof(statp->_u._ext.ext->nsaddrs[0]);
483
484 cp = buf + sizeof("nameserver") - 1;
485 while (*cp == ' ' || *cp == '\t')
486 cp++;
487 cp[strcspn(cp, ";# \t\n")] = '\0';
488 if ((*cp != '\0') && (*cp != '\n')) {
489 memset(&hints, 0, sizeof(hints));
490 hints.ai_family = PF_UNSPEC;
491 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
492 hints.ai_flags = AI_NUMERICHOST;
493 sprintf(sbuf, "%u", NAMESERVER_PORT);
494 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
495 ai->ai_addrlen <= minsiz) {
496 if (statp->_u._ext.ext != NULL) {
497 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
498 ai->ai_addr, ai->ai_addrlen);
499 }
500 if (ai->ai_addrlen <=
501 sizeof(statp->nsaddr_list[nserv])) {
502 memcpy(&statp->nsaddr_list[nserv],
503 ai->ai_addr, ai->ai_addrlen);
504 } else
505 statp->nsaddr_list[nserv].sin_family = 0;
506 freeaddrinfo(ai);
507 nserv++;
508 }
509 }
510 continue;
511 }
512 #ifdef RESOLVSORT
513 if (MATCH(buf, "sortlist")) {
514 struct in_addr a;
515
516 cp = buf + sizeof("sortlist") - 1;
517 while (nsort < MAXRESOLVSORT) {
518 while (*cp == ' ' || *cp == '\t')
519 cp++;
520 if (*cp == '\0' || *cp == '\n' || *cp == ';')
521 break;
522 net = cp;
523 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
524 isascii(*cp) && !isspace((unsigned char)*cp))
525 cp++;
526 n = *cp;
527 *cp = 0;
528 if (inet_aton(net, &a)) {
529 statp->sort_list[nsort].addr = a;
530 if (ISSORTMASK(n)) {
531 *cp++ = n;
532 net = cp;
533 while (*cp && *cp != ';' &&
534 isascii(*cp) &&
535 !isspace((unsigned char)*cp))
536 cp++;
537 n = *cp;
538 *cp = 0;
539 if (inet_aton(net, &a)) {
540 statp->sort_list[nsort].mask = a.s_addr;
541 } else {
542 statp->sort_list[nsort].mask =
543 net_mask(statp->sort_list[nsort].addr);
544 }
545 } else {
546 statp->sort_list[nsort].mask =
547 net_mask(statp->sort_list[nsort].addr);
548 }
549 nsort++;
550 }
551 *cp = n;
552 }
553 continue;
554 }
555 #endif
556 if (MATCH(buf, "options")) {
557 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
558 continue;
559 }
560 }
561 if (nserv > 0)
562 statp->nscount = nserv;
563 #ifdef RESOLVSORT
564 statp->nsort = nsort;
565 #endif
566 (void) fclose(fp);
567 }
568 /*
569 * Last chance to get a nameserver. This should not normally
570 * be necessary
571 */
572 #ifdef NO_RESOLV_CONF
573 if(nserv == 0)
574 nserv = get_nameservers(statp);
575 #endif
576
577 if (statp->defdname[0] == 0 &&
578 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
579 (cp = strchr(buf, '.')) != NULL)
580 strcpy(statp->defdname, cp + 1);
581
582 /* find components of local domain that might be searched */
583 if (havesearch == 0) {
584 pp = statp->dnsrch;
585 *pp++ = statp->defdname;
586 *pp = NULL;
587
588 dots = 0;
589 for (cp = statp->defdname; *cp; cp++)
590 dots += (*cp == '.');
591
592 cp = statp->defdname;
593 while (pp < statp->dnsrch + MAXDFLSRCH) {
594 if (dots < LOCALDOMAINPARTS)
595 break;
596 cp = strchr(cp, '.') + 1; /*%< we know there is one */
597 *pp++ = cp;
598 dots--;
599 }
600 *pp = NULL;
601 #ifdef DEBUG
602 if (statp->options & RES_DEBUG) {
603 printf(";; res_init()... default dnsrch list:\n");
604 for (pp = statp->dnsrch; *pp; pp++)
605 printf(";;\t%s\n", *pp);
606 printf(";;\t..END..\n");
607 }
608 #endif
609 }
610
611 if ((cp = getenv("RES_OPTIONS")) != NULL)
612 res_setoptions(statp, cp, "env");
613 statp->options |= RES_INIT;
614 return (statp->res_h_errno);
615 #ifdef SUNW_INITCHKIF
616 freedata:
617 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
618 if (statp->_u._ext.ext != NULL) {
619 free(statp->_u._ext.ext);
620 statp->_u._ext.ext = NULL;
621 }
622 return (-1);
623 #endif /* SUNW_INITCHKIF */
624
625 }
626
627 static void
res_setoptions(res_state statp,const char * options,const char * source)628 res_setoptions(res_state statp, const char *options, const char *source)
629 {
630 const char *cp = options;
631 int i;
632 struct __res_state_ext *ext = statp->_u._ext.ext;
633
634 #ifdef DEBUG
635 if (statp->options & RES_DEBUG)
636 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
637 options, source);
638 #endif
639 while (*cp) {
640 /* skip leading and inner runs of spaces */
641 while (*cp == ' ' || *cp == '\t')
642 cp++;
643 /* search for and process individual options */
644 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
645 i = atoi(cp + sizeof("ndots:") - 1);
646 if (i <= RES_MAXNDOTS)
647 statp->ndots = i;
648 else
649 statp->ndots = RES_MAXNDOTS;
650 #ifdef DEBUG
651 if (statp->options & RES_DEBUG)
652 printf(";;\tndots=%d\n", statp->ndots);
653 #endif
654 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
655 i = atoi(cp + sizeof("timeout:") - 1);
656 if (i <= RES_MAXRETRANS)
657 statp->retrans = i;
658 else
659 statp->retrans = RES_MAXRETRANS;
660 #ifdef DEBUG
661 if (statp->options & RES_DEBUG)
662 printf(";;\ttimeout=%d\n", statp->retrans);
663 #endif
664 #ifdef SOLARIS2
665 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
666 /*
667 * For backward compatibility, 'retrans' is
668 * supported as an alias for 'timeout', though
669 * without an imposed maximum.
670 */
671 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
672 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
673 /*
674 * For backward compatibility, 'retry' is
675 * supported as an alias for 'attempts', though
676 * without an imposed maximum.
677 */
678 statp->retry = atoi(cp + sizeof("retry:") - 1);
679 #endif /* SOLARIS2 */
680 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
681 i = atoi(cp + sizeof("attempts:") - 1);
682 if (i <= RES_MAXRETRY)
683 statp->retry = i;
684 else
685 statp->retry = RES_MAXRETRY;
686 #ifdef DEBUG
687 if (statp->options & RES_DEBUG)
688 printf(";;\tattempts=%d\n", statp->retry);
689 #endif
690 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
691 #ifdef DEBUG
692 if (!(statp->options & RES_DEBUG)) {
693 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
694 options, source);
695 statp->options |= RES_DEBUG;
696 }
697 printf(";;\tdebug\n");
698 #endif
699 } else if (!strncmp(cp, "no_tld_query",
700 sizeof("no_tld_query") - 1) ||
701 !strncmp(cp, "no-tld-query",
702 sizeof("no-tld-query") - 1)) {
703 statp->options |= RES_NOTLDQUERY;
704 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
705 statp->options |= RES_USE_INET6;
706 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
707 statp->options |= RES_ROTATE;
708 } else if (!strncmp(cp, "no-check-names",
709 sizeof("no-check-names") - 1)) {
710 statp->options |= RES_NOCHECKNAME;
711 }
712 #ifdef RES_USE_EDNS0
713 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
714 statp->options |= RES_USE_EDNS0;
715 }
716 #endif
717 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
718 statp->options |= RES_USE_DNAME;
719 }
720 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
721 if (ext == NULL)
722 goto skip;
723 cp += sizeof("nibble:") - 1;
724 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
725 strncpy(ext->nsuffix, cp, i);
726 ext->nsuffix[i] = '\0';
727 }
728 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
729 if (ext == NULL)
730 goto skip;
731 cp += sizeof("nibble2:") - 1;
732 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
733 strncpy(ext->nsuffix2, cp, i);
734 ext->nsuffix2[i] = '\0';
735 }
736 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
737 cp += sizeof("v6revmode:") - 1;
738 /* "nibble" and "bitstring" used to be valid */
739 if (!strncmp(cp, "single", sizeof("single") - 1)) {
740 statp->options |= RES_NO_NIBBLE2;
741 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
742 statp->options &=
743 ~RES_NO_NIBBLE2;
744 }
745 }
746 else {
747 /* XXX - print a warning here? */
748 }
749 skip:
750 /* skip to next run of spaces */
751 while (*cp && *cp != ' ' && *cp != '\t')
752 cp++;
753 }
754 }
755
756 #ifdef RESOLVSORT
757 /* XXX - should really support CIDR which means explicit masks always. */
758 static u_int32_t
net_mask(in)759 net_mask(in) /*!< XXX - should really use system's version of this */
760 struct in_addr in;
761 {
762 register u_int32_t i = ntohl(in.s_addr);
763
764 if (IN_CLASSA(i))
765 return (htonl(IN_CLASSA_NET));
766 else if (IN_CLASSB(i))
767 return (htonl(IN_CLASSB_NET));
768 return (htonl(IN_CLASSC_NET));
769 }
770 #endif
771
772 void
res_rndinit(res_state statp)773 res_rndinit(res_state statp)
774 {
775 struct timeval now;
776 u_int32_t u32;
777 u_int16_t u16;
778
779 gettimeofday(&now, NULL);
780 u32 = now.tv_sec;
781 memcpy(statp->_u._ext._rnd, &u32, 4);
782 u32 = now.tv_usec;
783 memcpy(statp->_u._ext._rnd + 4, &u32, 4);
784 u32 += now.tv_sec;
785 memcpy(statp->_u._ext._rnd + 8, &u32, 4);
786 u16 = getpid();
787 memcpy(statp->_u._ext._rnd + 12, &u16, 2);
788
789 }
790
791 u_int
res_nrandomid(res_state statp)792 res_nrandomid(res_state statp) {
793 struct timeval now;
794 u_int16_t u16;
795 MD5_CTX ctx;
796
797 gettimeofday(&now, NULL);
798 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
799
800 memcpy(statp->_u._ext._rnd + 14, &u16, 2);
801 #ifndef HAVE_MD5
802 MD5_Init(&ctx);
803 MD5_Update(&ctx, statp->_u._ext._rnd, 16);
804 MD5_Final(statp->_u._ext._rnd, &ctx);
805 #else
806 MD5Init(&ctx);
807 MD5Update(&ctx, statp->_u._ext._rnd, 16);
808 MD5Final(statp->_u._ext._rnd, &ctx);
809 #endif
810 memcpy(&u16, statp->_u._ext._rnd + 14, 2);
811 return ((u_int) u16);
812 }
813
814 /*%
815 * This routine is for closing the socket if a virtual circuit is used and
816 * the program wants to close it. This provides support for endhostent()
817 * which expects to close the socket.
818 *
819 * This routine is not expected to be user visible.
820 */
821 void
res_nclose(res_state statp)822 res_nclose(res_state statp) {
823 int ns;
824
825 if (statp->_vcsock >= 0) {
826 (void) close(statp->_vcsock);
827 statp->_vcsock = -1;
828 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
829 }
830 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
831 if (statp->_u._ext.nssocks[ns] != -1) {
832 (void) close(statp->_u._ext.nssocks[ns]);
833 statp->_u._ext.nssocks[ns] = -1;
834 }
835 }
836 }
837
838 void
res_ndestroy(res_state statp)839 res_ndestroy(res_state statp) {
840 res_nclose(statp);
841 if (statp->_u._ext.ext != NULL)
842 free(statp->_u._ext.ext);
843 statp->options &= ~RES_INIT;
844 statp->_u._ext.ext = NULL;
845 }
846
847 const char *
res_get_nibblesuffix(res_state statp)848 res_get_nibblesuffix(res_state statp) {
849 if (statp->_u._ext.ext)
850 return (statp->_u._ext.ext->nsuffix);
851 return ("ip6.arpa");
852 }
853
854 const char *
res_get_nibblesuffix2(res_state statp)855 res_get_nibblesuffix2(res_state statp) {
856 if (statp->_u._ext.ext)
857 return (statp->_u._ext.ext->nsuffix2);
858 return ("ip6.int");
859 }
860
861 void
res_setservers(res_state statp,const union res_sockaddr_union * set,int cnt)862 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
863 int i, nserv;
864 size_t size;
865
866 /* close open servers */
867 res_nclose(statp);
868
869 /* cause rtt times to be forgotten */
870 statp->_u._ext.nscount = 0;
871
872 nserv = 0;
873 for (i = 0; i < cnt && nserv < MAXNS; i++) {
874 switch (set->sin.sin_family) {
875 case AF_INET:
876 size = sizeof(set->sin);
877 if (statp->_u._ext.ext)
878 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
879 &set->sin, size);
880 if (size <= sizeof(statp->nsaddr_list[nserv]))
881 memcpy(&statp->nsaddr_list[nserv],
882 &set->sin, size);
883 else
884 statp->nsaddr_list[nserv].sin_family = 0;
885 nserv++;
886 break;
887
888 #ifdef HAS_INET6_STRUCTS
889 case AF_INET6:
890 size = sizeof(set->sin6);
891 if (statp->_u._ext.ext)
892 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
893 &set->sin6, size);
894 if (size <= sizeof(statp->nsaddr_list[nserv]))
895 memcpy(&statp->nsaddr_list[nserv],
896 &set->sin6, size);
897 else
898 statp->nsaddr_list[nserv].sin_family = 0;
899 nserv++;
900 break;
901 #endif
902
903 default:
904 break;
905 }
906 set++;
907 }
908 statp->nscount = nserv;
909
910 }
911
912 int
res_getservers(res_state statp,union res_sockaddr_union * set,int cnt)913 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
914 int i;
915 size_t size;
916 u_int16_t family;
917
918 for (i = 0; i < statp->nscount && i < cnt; i++) {
919 if (statp->_u._ext.ext)
920 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
921 else
922 family = statp->nsaddr_list[i].sin_family;
923
924 switch (family) {
925 case AF_INET:
926 size = sizeof(set->sin);
927 if (statp->_u._ext.ext)
928 memcpy(&set->sin,
929 &statp->_u._ext.ext->nsaddrs[i],
930 size);
931 else
932 memcpy(&set->sin, &statp->nsaddr_list[i],
933 size);
934 break;
935
936 #ifdef HAS_INET6_STRUCTS
937 case AF_INET6:
938 size = sizeof(set->sin6);
939 if (statp->_u._ext.ext)
940 memcpy(&set->sin6,
941 &statp->_u._ext.ext->nsaddrs[i],
942 size);
943 else
944 memcpy(&set->sin6, &statp->nsaddr_list[i],
945 size);
946 break;
947 #endif
948
949 default:
950 set->sin.sin_family = 0;
951 break;
952 }
953 set++;
954 }
955 return (statp->nscount);
956 }
957
958 /*! \file */
959