2 * Copyright (c) 1985, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
52 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
54 * Permission to use, copy, modify, and distribute this software for any
55 * purpose with or without fee is hereby granted, provided that the above
56 * copyright notice and this permission notice appear in all copies.
58 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
59 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
60 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
61 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
63 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
64 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
69 static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $";
70 #endif /* LIBC_SCCS and not lint */
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
74 #include "port_before.h"
76 #include "namespace.h"
78 #include <sys/param.h>
79 #include <sys/socket.h>
83 #include <netinet/in.h>
84 #include <arpa/inet.h>
85 #include <arpa/nameser.h>
95 # include "../dst/md5.h"
104 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
107 #include "un-namespace.h"
109 #include "port_after.h"
111 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
114 #include "res_private.h"
116 /*% Options. Should all be left alone. */
123 #include <sys/systeminfo.h>
126 static void res_setoptions(res_state, const char *, const char *);
129 static const char sort_mask[] = "/&";
130 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
131 static u_int32_t net_mask(struct in_addr);
134 #if !defined(isascii) /*%< XXX - could be a function */
135 # define isascii(c) (!(c & 0200))
139 * Resolver state default settings.
143 * Set up default settings. If the configuration file exist, the values
144 * there will have precedence. Otherwise, the server address is set to
145 * INADDR_ANY and the default domain name comes from the gethostname().
147 * An interim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
148 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
149 * since it was noted that INADDR_ANY actually meant ``the first interface
150 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
151 * it had to be "up" in order for you to reach your own name server. It
152 * was later decided that since the recommended practice is to always
153 * install local static routes through 127.0.0.1 for all your network
154 * interfaces, that we could solve this problem without a code change.
156 * The configuration file should always be used, since it is the only way
157 * to specify a default domain. If you are running a server on your local
158 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
159 * in the configuration file.
161 * Return 0 if completes successfully, -1 on error
164 res_ninit(res_state statp) {
165 extern int __res_vinit(res_state, int);
167 return (__res_vinit(statp, 0));
170 /*% This function has to be reachable by res_data.c but not publicly. */
172 __res_vinit(res_state statp, int preinit) {
177 int nserv = 0; /*%< number of nameserver records read from file */
185 union res_sockaddr_union u[2];
188 RES_SET_H_ERRNO(statp, 0);
189 if (statp->_u._ext.ext != NULL)
193 statp->retrans = RES_TIMEOUT;
194 statp->retry = RES_DFLRETRY;
195 statp->options = RES_DEFAULT;
198 statp->_rnd = malloc(16);
200 statp->id = res_nrandomid(statp);
202 memset(u, 0, sizeof(u));
204 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
206 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
208 u[nserv].sin.sin_family = AF_INET;
209 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
211 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
214 #ifdef HAS_INET6_STRUCTS
216 u[nserv].sin6.sin6_addr = in6addr_loopback;
218 u[nserv].sin6.sin6_addr = in6addr_any;
220 u[nserv].sin6.sin6_family = AF_INET6;
221 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
223 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
234 statp->_u._ext.nscount = 0;
235 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
236 if (statp->_u._ext.ext != NULL) {
237 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
238 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
239 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
240 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
241 statp->_u._ext.ext->reload_period = 2;
244 * Historically res_init() rarely, if at all, failed.
245 * Examples and applications exist which do not check
246 * our return code. Furthermore several applications
247 * simply call us to get the systems domainname. So
248 * rather then immediately fail here we store the
249 * failure, which is returned later, in h_errno. And
250 * prevent the collection of 'nameserver' information
251 * by setting maxns to 0. Thus applications that fail
252 * to check our return code wont be able to make
255 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
261 res_setservers(statp, u, nserv);
265 * The old libresolv derived the defaultdomain from NIS/NIS+.
266 * We want to keep this behaviour
269 char buf[sizeof(statp->defdname)], *cp;
272 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
273 (unsigned int)ret <= sizeof(buf)) {
276 cp = strchr(buf, '.');
277 cp = (cp == NULL) ? buf : (cp + 1);
278 strncpy(statp->defdname, cp,
279 sizeof(statp->defdname) - 1);
280 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
283 #endif /* SOLARIS2 */
285 /* Allow user to override the local domain definition */
286 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
287 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
288 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
292 * Set search list to be blank-separated strings
293 * from rest of env value. Permits users of LOCALDOMAIN
294 * to still have a search list, and anyone to set the
295 * one that they want to use as an individual (even more
296 * important now that the rfc1535 stuff restricts searches)
298 cp = statp->defdname;
301 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
302 if (*cp == '\n') /*%< silly backwards compat */
304 else if (*cp == ' ' || *cp == '\t') {
313 /* null terminate last domain if there are excess */
314 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
320 #define MATCH(line, name) \
321 (!strncmp(line, name, sizeof(name) - 1) && \
322 (line[sizeof(name) - 1] == ' ' || \
323 line[sizeof(name) - 1] == '\t'))
326 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
330 if (statp->_u._ext.ext != NULL) {
331 if (_fstat(fileno(fp), &sb) == 0) {
332 statp->_u._ext.ext->conf_mtim = sb.st_mtim;
333 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
334 statp->_u._ext.ext->conf_stat = now.tv_sec;
339 /* read the config file */
340 while (fgets(buf, sizeof(buf), fp) != NULL) {
342 if (*buf == ';' || *buf == '#')
344 /* read default domain name */
345 if (MATCH(buf, "domain")) {
346 if (haveenv) /*%< skip if have from environ */
348 cp = buf + sizeof("domain") - 1;
349 while (*cp == ' ' || *cp == '\t')
351 if ((*cp == '\0') || (*cp == '\n'))
353 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
354 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
355 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
360 /* set search list */
361 if (MATCH(buf, "search")) {
362 if (haveenv) /*%< skip if have from environ */
364 cp = buf + sizeof("search") - 1;
365 while (*cp == ' ' || *cp == '\t')
367 if ((*cp == '\0') || (*cp == '\n'))
369 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
370 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
371 if ((cp = strchr(statp->defdname, '\n')) != NULL)
374 * Set search list to be blank-separated strings
377 cp = statp->defdname;
380 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
381 if (*cp == ' ' || *cp == '\t') {
389 /* null terminate last domain if there are excess */
390 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
397 /* read nameservers to query */
398 if (MATCH(buf, "nameserver") && nserv < maxns) {
399 struct addrinfo hints, *ai;
400 char sbuf[NI_MAXSERV];
401 const size_t minsiz =
402 sizeof(statp->_u._ext.ext->nsaddrs[0]);
404 cp = buf + sizeof("nameserver") - 1;
405 while (*cp == ' ' || *cp == '\t')
407 cp[strcspn(cp, ";# \t\n")] = '\0';
408 if ((*cp != '\0') && (*cp != '\n')) {
409 memset(&hints, 0, sizeof(hints));
410 hints.ai_family = PF_UNSPEC;
411 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
412 hints.ai_flags = AI_NUMERICHOST;
413 sprintf(sbuf, "%u", NAMESERVER_PORT);
414 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
415 ai->ai_addrlen <= minsiz) {
416 if (statp->_u._ext.ext != NULL) {
417 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
418 ai->ai_addr, ai->ai_addrlen);
420 if (ai->ai_addrlen <=
421 sizeof(statp->nsaddr_list[nserv])) {
422 memcpy(&statp->nsaddr_list[nserv],
423 ai->ai_addr, ai->ai_addrlen);
425 statp->nsaddr_list[nserv].sin_family = 0;
433 if (MATCH(buf, "sortlist")) {
438 struct __res_state_ext *ext = statp->_u._ext.ext;
440 cp = buf + sizeof("sortlist") - 1;
441 while (nsort < MAXRESOLVSORT) {
442 while (*cp == ' ' || *cp == '\t')
444 if (*cp == '\0' || *cp == '\n' || *cp == ';')
447 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
448 isascii(*cp) && !isspace((unsigned char)*cp))
452 if (inet_aton(net, &a)) {
453 statp->sort_list[nsort].addr = a;
457 while (*cp && *cp != ';' &&
459 !isspace((unsigned char)*cp))
463 if (inet_aton(net, &a)) {
464 statp->sort_list[nsort].mask = a.s_addr;
466 statp->sort_list[nsort].mask =
467 net_mask(statp->sort_list[nsort].addr);
470 statp->sort_list[nsort].mask =
471 net_mask(statp->sort_list[nsort].addr);
473 ext->sort_list[nsort].af = AF_INET;
474 ext->sort_list[nsort].addr.ina =
475 statp->sort_list[nsort].addr;
476 ext->sort_list[nsort].mask.ina.s_addr =
477 statp->sort_list[nsort].mask;
480 else if (inet_pton(AF_INET6, net, &a6) == 1) {
482 ext->sort_list[nsort].af = AF_INET6;
483 ext->sort_list[nsort].addr.in6a = a6;
484 u = (u_char *)&ext->sort_list[nsort].mask.in6a;
487 while (*cp && *cp != ';' &&
488 isascii(*cp) && !isspace(*cp))
498 if (inet_pton(AF_INET6, net, u) == 1) {
504 m = sizeof(struct in6_addr) * CHAR_BIT;
508 for (i = 0; i < sizeof(struct in6_addr); i++) {
520 statp->sort_list[nsort].addr.s_addr =
521 (u_int32_t)0xffffffff;
522 statp->sort_list[nsort].mask =
523 (u_int32_t)0xffffffff;
531 if (MATCH(buf, "options")) {
532 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
537 statp->nscount = nserv;
539 statp->nsort = nsort;
544 * Last chance to get a nameserver. This should not normally
547 #ifdef NO_RESOLV_CONF
549 nserv = get_nameservers(statp);
552 if (statp->defdname[0] == 0 &&
553 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
554 (cp = strchr(buf, '.')) != NULL)
555 strcpy(statp->defdname, cp + 1);
557 /* find components of local domain that might be searched */
558 if (havesearch == 0) {
560 *pp++ = statp->defdname;
564 for (cp = statp->defdname; *cp; cp++)
565 dots += (*cp == '.');
567 cp = statp->defdname;
568 while (pp < statp->dnsrch + MAXDFLSRCH) {
569 if (dots < LOCALDOMAINPARTS)
571 cp = strchr(cp, '.') + 1; /*%< we know there is one */
577 if (statp->options & RES_DEBUG) {
578 printf(";; res_init()... default dnsrch list:\n");
579 for (pp = statp->dnsrch; *pp; pp++)
580 printf(";;\t%s\n", *pp);
581 printf(";;\t..END..\n");
587 statp->options |= RES_NOALIASES;
588 else if ((cp = getenv("RES_OPTIONS")) != NULL)
589 res_setoptions(statp, cp, "env");
590 statp->options |= RES_INIT;
591 return (statp->res_h_errno);
595 res_setoptions(res_state statp, const char *options, const char *source)
597 const char *cp = options;
599 struct __res_state_ext *ext = statp->_u._ext.ext;
602 if (statp->options & RES_DEBUG)
603 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
607 /* skip leading and inner runs of spaces */
608 while (*cp == ' ' || *cp == '\t')
610 /* search for and process individual options */
611 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
612 i = atoi(cp + sizeof("ndots:") - 1);
613 if (i <= RES_MAXNDOTS)
616 statp->ndots = RES_MAXNDOTS;
618 if (statp->options & RES_DEBUG)
619 printf(";;\tndots=%d\n", statp->ndots);
621 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
622 i = atoi(cp + sizeof("timeout:") - 1);
623 if (i <= RES_MAXRETRANS)
626 statp->retrans = RES_MAXRETRANS;
628 if (statp->options & RES_DEBUG)
629 printf(";;\ttimeout=%d\n", statp->retrans);
632 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
634 * For backward compatibility, 'retrans' is
635 * supported as an alias for 'timeout', though
636 * without an imposed maximum.
638 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
639 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
641 * For backward compatibility, 'retry' is
642 * supported as an alias for 'attempts', though
643 * without an imposed maximum.
645 statp->retry = atoi(cp + sizeof("retry:") - 1);
646 #endif /* SOLARIS2 */
647 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
648 i = atoi(cp + sizeof("attempts:") - 1);
649 if (i <= RES_MAXRETRY)
652 statp->retry = RES_MAXRETRY;
654 if (statp->options & RES_DEBUG)
655 printf(";;\tattempts=%d\n", statp->retry);
657 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
659 if (!(statp->options & RES_DEBUG)) {
660 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
662 statp->options |= RES_DEBUG;
664 printf(";;\tdebug\n");
666 } else if (!strncmp(cp, "no_tld_query",
667 sizeof("no_tld_query") - 1) ||
668 !strncmp(cp, "no-tld-query",
669 sizeof("no-tld-query") - 1)) {
670 statp->options |= RES_NOTLDQUERY;
671 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
672 statp->options |= RES_USE_INET6;
673 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
674 statp->options |= RES_INSECURE1;
675 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
676 statp->options |= RES_INSECURE2;
677 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
678 statp->options |= RES_ROTATE;
679 } else if (!strncmp(cp, "no-check-names",
680 sizeof("no-check-names") - 1)) {
681 statp->options |= RES_NOCHECKNAME;
682 } else if (!strncmp(cp, "reload-period:",
683 sizeof("reload-period:") - 1)) {
685 ext->reload_period = (u_short)
686 atoi(cp + sizeof("reload-period:") - 1);
690 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
691 statp->options |= RES_USE_EDNS0;
695 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
696 statp->options |= RES_USE_DNAME;
698 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
701 cp += sizeof("nibble:") - 1;
702 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
703 strncpy(ext->nsuffix, cp, i);
704 ext->nsuffix[i] = '\0';
706 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
709 cp += sizeof("nibble2:") - 1;
710 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
711 strncpy(ext->nsuffix2, cp, i);
712 ext->nsuffix2[i] = '\0';
714 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
715 cp += sizeof("v6revmode:") - 1;
716 /* "nibble" and "bitstring" used to be valid */
717 if (!strncmp(cp, "single", sizeof("single") - 1)) {
718 statp->options |= RES_NO_NIBBLE2;
719 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
726 /* XXX - print a warning here? */
731 /* skip to next run of spaces */
732 while (*cp && *cp != ' ' && *cp != '\t')
738 /* XXX - should really support CIDR which means explicit masks always. */
740 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
742 u_int32_t i = ntohl(in.s_addr);
745 return (htonl(IN_CLASSA_NET));
746 else if (IN_CLASSB(i))
747 return (htonl(IN_CLASSB_NET));
748 return (htonl(IN_CLASSC_NET));
752 static u_char srnd[16];
755 res_rndinit(res_state statp)
760 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
762 gettimeofday(&now, NULL);
764 memcpy(rnd, &u32, 4);
766 memcpy(rnd + 4, &u32, 4);
768 memcpy(rnd + 8, &u32, 4);
770 memcpy(rnd + 12, &u16, 2);
774 res_nrandomid(res_state statp) {
778 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
780 gettimeofday(&now, NULL);
781 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
782 memcpy(rnd + 14, &u16, 2);
785 MD5_Update(&ctx, rnd, 16);
786 MD5_Final(rnd, &ctx);
789 MD5Update(&ctx, rnd, 16);
792 memcpy(&u16, rnd + 14, 2);
793 return ((u_int) u16);
797 * This routine is for closing the socket if a virtual circuit is used and
798 * the program wants to close it. This provides support for endhostent()
799 * which expects to close the socket.
801 * This routine is not expected to be user visible.
804 res_nclose(res_state statp) {
807 if (statp->_vcsock >= 0) {
808 (void) _close(statp->_vcsock);
810 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
812 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
813 if (statp->_u._ext.nssocks[ns] != -1) {
814 (void) _close(statp->_u._ext.nssocks[ns]);
815 statp->_u._ext.nssocks[ns] = -1;
821 res_ndestroy(res_state statp) {
823 if (statp->_u._ext.ext != NULL) {
824 free(statp->_u._ext.ext);
825 statp->_u._ext.ext = NULL;
827 if (statp->_rnd != NULL) {
831 statp->options &= ~RES_INIT;
836 res_get_nibblesuffix(res_state statp) {
837 if (statp->_u._ext.ext)
838 return (statp->_u._ext.ext->nsuffix);
843 res_get_nibblesuffix2(res_state statp) {
844 if (statp->_u._ext.ext)
845 return (statp->_u._ext.ext->nsuffix2);
851 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
855 /* close open servers */
858 /* cause rtt times to be forgotten */
859 statp->_u._ext.nscount = 0;
862 for (i = 0; i < cnt && nserv < MAXNS; i++) {
863 switch (set->sin.sin_family) {
865 size = sizeof(set->sin);
866 if (statp->_u._ext.ext)
867 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
869 if (size <= sizeof(statp->nsaddr_list[nserv]))
870 memcpy(&statp->nsaddr_list[nserv],
873 statp->nsaddr_list[nserv].sin_family = 0;
877 #ifdef HAS_INET6_STRUCTS
879 size = sizeof(set->sin6);
880 if (statp->_u._ext.ext)
881 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
883 if (size <= sizeof(statp->nsaddr_list[nserv]))
884 memcpy(&statp->nsaddr_list[nserv],
887 statp->nsaddr_list[nserv].sin_family = 0;
897 statp->nscount = nserv;
902 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
907 for (i = 0; i < statp->nscount && i < cnt; i++) {
908 if (statp->_u._ext.ext)
909 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
911 family = statp->nsaddr_list[i].sin_family;
915 size = sizeof(set->sin);
916 if (statp->_u._ext.ext)
918 &statp->_u._ext.ext->nsaddrs[i],
921 memcpy(&set->sin, &statp->nsaddr_list[i],
925 #ifdef HAS_INET6_STRUCTS
927 size = sizeof(set->sin6);
928 if (statp->_u._ext.ext)
930 &statp->_u._ext.ext->nsaddrs[i],
933 memcpy(&set->sin6, &statp->nsaddr_list[i],
939 set->sin.sin_family = 0;
944 return (statp->nscount);