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/types.h>
79 #include <sys/param.h>
80 #include <sys/socket.h>
84 #include <netinet/in.h>
85 #include <arpa/inet.h>
86 #include <arpa/nameser.h>
96 # include "../dst/md5.h"
105 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
108 #include "un-namespace.h"
110 #include "port_after.h"
112 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
115 #include "res_private.h"
117 /*% Options. Should all be left alone. */
124 #include <sys/systeminfo.h>
127 static void res_setoptions(res_state, const char *, const char *);
130 static const char sort_mask[] = "/&";
131 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
132 static u_int32_t net_mask(struct in_addr);
135 #if !defined(isascii) /*%< XXX - could be a function */
136 # define isascii(c) (!(c & 0200))
140 * Resolver state default settings.
144 * Set up default settings. If the configuration file exist, the values
145 * there will have precedence. Otherwise, the server address is set to
146 * INADDR_ANY and the default domain name comes from the gethostname().
148 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
149 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
150 * since it was noted that INADDR_ANY actually meant ``the first interface
151 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
152 * it had to be "up" in order for you to reach your own name server. It
153 * was later decided that since the recommended practice is to always
154 * install local static routes through 127.0.0.1 for all your network
155 * interfaces, that we could solve this problem without a code change.
157 * The configuration file should always be used, since it is the only way
158 * to specify a default domain. If you are running a server on your local
159 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
160 * in the configuration file.
162 * Return 0 if completes successfully, -1 on error
165 res_ninit(res_state statp) {
166 extern int __res_vinit(res_state, int);
168 return (__res_vinit(statp, 0));
171 /*% This function has to be reachable by res_data.c but not publically. */
173 __res_vinit(res_state statp, int preinit) {
178 int nserv = 0; /*%< number of nameserver records read from file */
186 union res_sockaddr_union u[2];
189 RES_SET_H_ERRNO(statp, 0);
190 if (statp->_u._ext.ext != NULL)
194 statp->retrans = RES_TIMEOUT;
195 statp->retry = RES_DFLRETRY;
196 statp->options = RES_DEFAULT;
199 statp->_rnd = malloc(16);
201 statp->id = res_nrandomid(statp);
203 memset(u, 0, sizeof(u));
205 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
207 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
209 u[nserv].sin.sin_family = AF_INET;
210 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
212 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
215 #ifdef HAS_INET6_STRUCTS
217 u[nserv].sin6.sin6_addr = in6addr_loopback;
219 u[nserv].sin6.sin6_addr = in6addr_any;
221 u[nserv].sin6.sin6_family = AF_INET6;
222 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
224 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
235 statp->_u._ext.nscount = 0;
236 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
237 if (statp->_u._ext.ext != NULL) {
238 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
239 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
240 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
241 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
242 statp->_u._ext.ext->reload_period = 2;
245 * Historically res_init() rarely, if at all, failed.
246 * Examples and applications exist which do not check
247 * our return code. Furthermore several applications
248 * simply call us to get the systems domainname. So
249 * rather then immediately fail here we store the
250 * failure, which is returned later, in h_errno. And
251 * prevent the collection of 'nameserver' information
252 * by setting maxns to 0. Thus applications that fail
253 * to check our return code wont be able to make
256 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
262 res_setservers(statp, u, nserv);
266 * The old libresolv derived the defaultdomain from NIS/NIS+.
267 * We want to keep this behaviour
270 char buf[sizeof(statp->defdname)], *cp;
273 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
274 (unsigned int)ret <= sizeof(buf)) {
277 cp = strchr(buf, '.');
278 cp = (cp == NULL) ? buf : (cp + 1);
279 strncpy(statp->defdname, cp,
280 sizeof(statp->defdname) - 1);
281 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
284 #endif /* SOLARIS2 */
286 /* Allow user to override the local domain definition */
287 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
288 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
289 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
293 * Set search list to be blank-separated strings
294 * from rest of env value. Permits users of LOCALDOMAIN
295 * to still have a search list, and anyone to set the
296 * one that they want to use as an individual (even more
297 * important now that the rfc1535 stuff restricts searches)
299 cp = statp->defdname;
302 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
303 if (*cp == '\n') /*%< silly backwards compat */
305 else if (*cp == ' ' || *cp == '\t') {
314 /* null terminate last domain if there are excess */
315 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
321 #define MATCH(line, name) \
322 (!strncmp(line, name, sizeof(name) - 1) && \
323 (line[sizeof(name) - 1] == ' ' || \
324 line[sizeof(name) - 1] == '\t'))
327 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
331 if (statp->_u._ext.ext != NULL) {
332 if (_fstat(fileno(fp), &sb) == 0) {
333 statp->_u._ext.ext->conf_mtim = sb.st_mtim;
334 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
335 statp->_u._ext.ext->conf_stat = now.tv_sec;
340 /* read the config file */
341 while (fgets(buf, sizeof(buf), fp) != NULL) {
343 if (*buf == ';' || *buf == '#')
345 /* read default domain name */
346 if (MATCH(buf, "domain")) {
347 if (haveenv) /*%< skip if have from environ */
349 cp = buf + sizeof("domain") - 1;
350 while (*cp == ' ' || *cp == '\t')
352 if ((*cp == '\0') || (*cp == '\n'))
354 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
355 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
356 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
361 /* set search list */
362 if (MATCH(buf, "search")) {
363 if (haveenv) /*%< skip if have from environ */
365 cp = buf + sizeof("search") - 1;
366 while (*cp == ' ' || *cp == '\t')
368 if ((*cp == '\0') || (*cp == '\n'))
370 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
371 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
372 if ((cp = strchr(statp->defdname, '\n')) != NULL)
375 * Set search list to be blank-separated strings
378 cp = statp->defdname;
381 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
382 if (*cp == ' ' || *cp == '\t') {
390 /* null terminate last domain if there are excess */
391 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
398 /* read nameservers to query */
399 if (MATCH(buf, "nameserver") && nserv < maxns) {
400 struct addrinfo hints, *ai;
401 char sbuf[NI_MAXSERV];
402 const size_t minsiz =
403 sizeof(statp->_u._ext.ext->nsaddrs[0]);
405 cp = buf + sizeof("nameserver") - 1;
406 while (*cp == ' ' || *cp == '\t')
408 cp[strcspn(cp, ";# \t\n")] = '\0';
409 if ((*cp != '\0') && (*cp != '\n')) {
410 memset(&hints, 0, sizeof(hints));
411 hints.ai_family = PF_UNSPEC;
412 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
413 hints.ai_flags = AI_NUMERICHOST;
414 sprintf(sbuf, "%u", NAMESERVER_PORT);
415 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
416 ai->ai_addrlen <= minsiz) {
417 if (statp->_u._ext.ext != NULL) {
418 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
419 ai->ai_addr, ai->ai_addrlen);
421 if (ai->ai_addrlen <=
422 sizeof(statp->nsaddr_list[nserv])) {
423 memcpy(&statp->nsaddr_list[nserv],
424 ai->ai_addr, ai->ai_addrlen);
426 statp->nsaddr_list[nserv].sin_family = 0;
434 if (MATCH(buf, "sortlist")) {
439 struct __res_state_ext *ext = statp->_u._ext.ext;
441 cp = buf + sizeof("sortlist") - 1;
442 while (nsort < MAXRESOLVSORT) {
443 while (*cp == ' ' || *cp == '\t')
445 if (*cp == '\0' || *cp == '\n' || *cp == ';')
448 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
449 isascii(*cp) && !isspace((unsigned char)*cp))
453 if (inet_aton(net, &a)) {
454 statp->sort_list[nsort].addr = a;
458 while (*cp && *cp != ';' &&
460 !isspace((unsigned char)*cp))
464 if (inet_aton(net, &a)) {
465 statp->sort_list[nsort].mask = a.s_addr;
467 statp->sort_list[nsort].mask =
468 net_mask(statp->sort_list[nsort].addr);
471 statp->sort_list[nsort].mask =
472 net_mask(statp->sort_list[nsort].addr);
474 ext->sort_list[nsort].af = AF_INET;
475 ext->sort_list[nsort].addr.ina =
476 statp->sort_list[nsort].addr;
477 ext->sort_list[nsort].mask.ina.s_addr =
478 statp->sort_list[nsort].mask;
481 else if (inet_pton(AF_INET6, net, &a6) == 1) {
483 ext->sort_list[nsort].af = AF_INET6;
484 ext->sort_list[nsort].addr.in6a = a6;
485 u = (u_char *)&ext->sort_list[nsort].mask.in6a;
488 while (*cp && *cp != ';' &&
489 isascii(*cp) && !isspace(*cp))
499 if (inet_pton(AF_INET6, net, u) == 1) {
505 m = sizeof(struct in6_addr) * CHAR_BIT;
509 for (i = 0; i < sizeof(struct in6_addr); i++) {
521 statp->sort_list[nsort].addr.s_addr =
522 (u_int32_t)0xffffffff;
523 statp->sort_list[nsort].mask =
524 (u_int32_t)0xffffffff;
532 if (MATCH(buf, "options")) {
533 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
538 statp->nscount = nserv;
540 statp->nsort = nsort;
545 * Last chance to get a nameserver. This should not normally
548 #ifdef NO_RESOLV_CONF
550 nserv = get_nameservers(statp);
553 if (statp->defdname[0] == 0 &&
554 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
555 (cp = strchr(buf, '.')) != NULL)
556 strcpy(statp->defdname, cp + 1);
558 /* find components of local domain that might be searched */
559 if (havesearch == 0) {
561 *pp++ = statp->defdname;
565 for (cp = statp->defdname; *cp; cp++)
566 dots += (*cp == '.');
568 cp = statp->defdname;
569 while (pp < statp->dnsrch + MAXDFLSRCH) {
570 if (dots < LOCALDOMAINPARTS)
572 cp = strchr(cp, '.') + 1; /*%< we know there is one */
578 if (statp->options & RES_DEBUG) {
579 printf(";; res_init()... default dnsrch list:\n");
580 for (pp = statp->dnsrch; *pp; pp++)
581 printf(";;\t%s\n", *pp);
582 printf(";;\t..END..\n");
588 statp->options |= RES_NOALIASES;
589 else if ((cp = getenv("RES_OPTIONS")) != NULL)
590 res_setoptions(statp, cp, "env");
591 statp->options |= RES_INIT;
592 return (statp->res_h_errno);
596 res_setoptions(res_state statp, const char *options, const char *source)
598 const char *cp = options;
600 struct __res_state_ext *ext = statp->_u._ext.ext;
603 if (statp->options & RES_DEBUG)
604 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
608 /* skip leading and inner runs of spaces */
609 while (*cp == ' ' || *cp == '\t')
611 /* search for and process individual options */
612 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
613 i = atoi(cp + sizeof("ndots:") - 1);
614 if (i <= RES_MAXNDOTS)
617 statp->ndots = RES_MAXNDOTS;
619 if (statp->options & RES_DEBUG)
620 printf(";;\tndots=%d\n", statp->ndots);
622 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
623 i = atoi(cp + sizeof("timeout:") - 1);
624 if (i <= RES_MAXRETRANS)
627 statp->retrans = RES_MAXRETRANS;
629 if (statp->options & RES_DEBUG)
630 printf(";;\ttimeout=%d\n", statp->retrans);
633 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
635 * For backward compatibility, 'retrans' is
636 * supported as an alias for 'timeout', though
637 * without an imposed maximum.
639 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
640 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
642 * For backward compatibility, 'retry' is
643 * supported as an alias for 'attempts', though
644 * without an imposed maximum.
646 statp->retry = atoi(cp + sizeof("retry:") - 1);
647 #endif /* SOLARIS2 */
648 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
649 i = atoi(cp + sizeof("attempts:") - 1);
650 if (i <= RES_MAXRETRY)
653 statp->retry = RES_MAXRETRY;
655 if (statp->options & RES_DEBUG)
656 printf(";;\tattempts=%d\n", statp->retry);
658 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
660 if (!(statp->options & RES_DEBUG)) {
661 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
663 statp->options |= RES_DEBUG;
665 printf(";;\tdebug\n");
667 } else if (!strncmp(cp, "no_tld_query",
668 sizeof("no_tld_query") - 1) ||
669 !strncmp(cp, "no-tld-query",
670 sizeof("no-tld-query") - 1)) {
671 statp->options |= RES_NOTLDQUERY;
672 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
673 statp->options |= RES_USE_INET6;
674 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
675 statp->options |= RES_INSECURE1;
676 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
677 statp->options |= RES_INSECURE2;
678 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
679 statp->options |= RES_ROTATE;
680 } else if (!strncmp(cp, "no-check-names",
681 sizeof("no-check-names") - 1)) {
682 statp->options |= RES_NOCHECKNAME;
683 } else if (!strncmp(cp, "reload-period:",
684 sizeof("reload-period:") - 1)) {
686 ext->reload_period = (u_short)
687 atoi(cp + sizeof("reload-period:") - 1);
691 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
692 statp->options |= RES_USE_EDNS0;
696 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
697 statp->options |= RES_USE_DNAME;
699 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
702 cp += sizeof("nibble:") - 1;
703 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
704 strncpy(ext->nsuffix, cp, i);
705 ext->nsuffix[i] = '\0';
707 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
710 cp += sizeof("nibble2:") - 1;
711 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
712 strncpy(ext->nsuffix2, cp, i);
713 ext->nsuffix2[i] = '\0';
715 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
716 cp += sizeof("v6revmode:") - 1;
717 /* "nibble" and "bitstring" used to be valid */
718 if (!strncmp(cp, "single", sizeof("single") - 1)) {
719 statp->options |= RES_NO_NIBBLE2;
720 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
727 /* XXX - print a warning here? */
732 /* skip to next run of spaces */
733 while (*cp && *cp != ' ' && *cp != '\t')
739 /* XXX - should really support CIDR which means explicit masks always. */
741 net_mask(in) /*!< XXX - should really use system's version of this */
744 u_int32_t i = ntohl(in.s_addr);
747 return (htonl(IN_CLASSA_NET));
748 else if (IN_CLASSB(i))
749 return (htonl(IN_CLASSB_NET));
750 return (htonl(IN_CLASSC_NET));
754 static u_char srnd[16];
757 res_rndinit(res_state statp)
762 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
764 gettimeofday(&now, NULL);
766 memcpy(rnd, &u32, 4);
768 memcpy(rnd + 4, &u32, 4);
770 memcpy(rnd + 8, &u32, 4);
772 memcpy(rnd + 12, &u16, 2);
776 res_nrandomid(res_state statp) {
780 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
782 gettimeofday(&now, NULL);
783 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
784 memcpy(rnd + 14, &u16, 2);
787 MD5_Update(&ctx, rnd, 16);
788 MD5_Final(rnd, &ctx);
791 MD5Update(&ctx, rnd, 16);
794 memcpy(&u16, rnd + 14, 2);
795 return ((u_int) u16);
799 * This routine is for closing the socket if a virtual circuit is used and
800 * the program wants to close it. This provides support for endhostent()
801 * which expects to close the socket.
803 * This routine is not expected to be user visible.
806 res_nclose(res_state statp) {
809 if (statp->_vcsock >= 0) {
810 (void) _close(statp->_vcsock);
812 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
814 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
815 if (statp->_u._ext.nssocks[ns] != -1) {
816 (void) _close(statp->_u._ext.nssocks[ns]);
817 statp->_u._ext.nssocks[ns] = -1;
823 res_ndestroy(res_state statp) {
825 if (statp->_u._ext.ext != NULL) {
826 free(statp->_u._ext.ext);
827 statp->_u._ext.ext = NULL;
829 if (statp->_rnd != NULL) {
833 statp->options &= ~RES_INIT;
838 res_get_nibblesuffix(res_state statp) {
839 if (statp->_u._ext.ext)
840 return (statp->_u._ext.ext->nsuffix);
845 res_get_nibblesuffix2(res_state statp) {
846 if (statp->_u._ext.ext)
847 return (statp->_u._ext.ext->nsuffix2);
853 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
857 /* close open servers */
860 /* cause rtt times to be forgotten */
861 statp->_u._ext.nscount = 0;
864 for (i = 0; i < cnt && nserv < MAXNS; i++) {
865 switch (set->sin.sin_family) {
867 size = sizeof(set->sin);
868 if (statp->_u._ext.ext)
869 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
871 if (size <= sizeof(statp->nsaddr_list[nserv]))
872 memcpy(&statp->nsaddr_list[nserv],
875 statp->nsaddr_list[nserv].sin_family = 0;
879 #ifdef HAS_INET6_STRUCTS
881 size = sizeof(set->sin6);
882 if (statp->_u._ext.ext)
883 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
885 if (size <= sizeof(statp->nsaddr_list[nserv]))
886 memcpy(&statp->nsaddr_list[nserv],
889 statp->nsaddr_list[nserv].sin_family = 0;
899 statp->nscount = nserv;
904 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
909 for (i = 0; i < statp->nscount && i < cnt; i++) {
910 if (statp->_u._ext.ext)
911 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
913 family = statp->nsaddr_list[i].sin_family;
917 size = sizeof(set->sin);
918 if (statp->_u._ext.ext)
920 &statp->_u._ext.ext->nsaddrs[i],
923 memcpy(&set->sin, &statp->nsaddr_list[i],
927 #ifdef HAS_INET6_STRUCTS
929 size = sizeof(set->sin6);
930 if (statp->_u._ext.ext)
932 &statp->_u._ext.ext->nsaddrs[i],
935 memcpy(&set->sin6, &statp->nsaddr_list[i],
941 set->sin.sin_family = 0;
946 return (statp->nscount);