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. */
122 #include <sys/systeminfo.h>
125 static void res_setoptions(res_state, const char *, const char *);
128 static const char sort_mask[] = "/&";
129 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
130 static u_int32_t net_mask(struct in_addr);
133 #if !defined(isascii) /*%< XXX - could be a function */
134 # define isascii(c) (!(c & 0200))
138 * Resolver state default settings.
142 * Set up default settings. If the configuration file exist, the values
143 * there will have precedence. Otherwise, the server address is set to
144 * INADDR_ANY and the default domain name comes from the gethostname().
146 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
147 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
148 * since it was noted that INADDR_ANY actually meant ``the first interface
149 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
150 * it had to be "up" in order for you to reach your own name server. It
151 * was later decided that since the recommended practice is to always
152 * install local static routes through 127.0.0.1 for all your network
153 * interfaces, that we could solve this problem without a code change.
155 * The configuration file should always be used, since it is the only way
156 * to specify a default domain. If you are running a server on your local
157 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
158 * in the configuration file.
160 * Return 0 if completes successfully, -1 on error
163 res_ninit(res_state statp) {
164 extern int __res_vinit(res_state, int);
166 return (__res_vinit(statp, 0));
169 /*% This function has to be reachable by res_data.c but not publically. */
171 __res_vinit(res_state statp, int preinit) {
176 int nserv = 0; /*%< number of nameserver records read from file */
184 union res_sockaddr_union u[2];
187 RES_SET_H_ERRNO(statp, 0);
188 if (statp->_u._ext.ext != NULL)
192 statp->retrans = RES_TIMEOUT;
193 statp->retry = RES_DFLRETRY;
194 statp->options = RES_DEFAULT;
197 statp->_rnd = malloc(16);
199 statp->id = res_nrandomid(statp);
201 memset(u, 0, sizeof(u));
203 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
205 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
207 u[nserv].sin.sin_family = AF_INET;
208 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
210 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
213 #ifdef HAS_INET6_STRUCTS
215 u[nserv].sin6.sin6_addr = in6addr_loopback;
217 u[nserv].sin6.sin6_addr = in6addr_any;
219 u[nserv].sin6.sin6_family = AF_INET6;
220 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
222 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
231 statp->reload_period = 2;
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");
243 * Historically res_init() rarely, if at all, failed.
244 * Examples and applications exist which do not check
245 * our return code. Furthermore several applications
246 * simply call us to get the systems domainname. So
247 * rather then immediately fail here we store the
248 * failure, which is returned later, in h_errno. And
249 * prevent the collection of 'nameserver' information
250 * by setting maxns to 0. Thus applications that fail
251 * to check our return code wont be able to make
254 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
260 res_setservers(statp, u, nserv);
264 * The old libresolv derived the defaultdomain from NIS/NIS+.
265 * We want to keep this behaviour
268 char buf[sizeof(statp->defdname)], *cp;
271 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
272 (unsigned int)ret <= sizeof(buf)) {
275 cp = strchr(buf, '.');
276 cp = (cp == NULL) ? buf : (cp + 1);
277 strncpy(statp->defdname, cp,
278 sizeof(statp->defdname) - 1);
279 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
282 #endif /* SOLARIS2 */
284 /* Allow user to override the local domain definition */
285 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
286 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
287 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
291 * Set search list to be blank-separated strings
292 * from rest of env value. Permits users of LOCALDOMAIN
293 * to still have a search list, and anyone to set the
294 * one that they want to use as an individual (even more
295 * important now that the rfc1535 stuff restricts searches)
297 cp = statp->defdname;
300 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
301 if (*cp == '\n') /*%< silly backwards compat */
303 else if (*cp == ' ' || *cp == '\t') {
312 /* null terminate last domain if there are excess */
313 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
319 #define MATCH(line, name) \
320 (!strncmp(line, name, sizeof(name) - 1) && \
321 (line[sizeof(name) - 1] == ' ' || \
322 line[sizeof(name) - 1] == '\t'))
325 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
329 if (_fstat(fileno(fp), &sb) == 0) {
330 statp->conf_mtim = sb.st_mtim;
331 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
332 statp->conf_stat = now.tv_sec;
334 statp->conf_stat = 0;
337 statp->conf_mtim.tv_sec = 0;
338 statp->conf_mtim.tv_nsec = 0;
339 statp->conf_stat = 0;
342 /* read the config file */
343 while (fgets(buf, sizeof(buf), fp) != NULL) {
345 if (*buf == ';' || *buf == '#')
347 /* read default domain name */
348 if (MATCH(buf, "domain")) {
349 if (haveenv) /*%< skip if have from environ */
351 cp = buf + sizeof("domain") - 1;
352 while (*cp == ' ' || *cp == '\t')
354 if ((*cp == '\0') || (*cp == '\n'))
356 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
357 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
358 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
363 /* set search list */
364 if (MATCH(buf, "search")) {
365 if (haveenv) /*%< skip if have from environ */
367 cp = buf + sizeof("search") - 1;
368 while (*cp == ' ' || *cp == '\t')
370 if ((*cp == '\0') || (*cp == '\n'))
372 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
373 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
374 if ((cp = strchr(statp->defdname, '\n')) != NULL)
377 * Set search list to be blank-separated strings
380 cp = statp->defdname;
383 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
384 if (*cp == ' ' || *cp == '\t') {
392 /* null terminate last domain if there are excess */
393 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
400 /* read nameservers to query */
401 if (MATCH(buf, "nameserver") && nserv < maxns) {
402 struct addrinfo hints, *ai;
403 char sbuf[NI_MAXSERV];
404 const size_t minsiz =
405 sizeof(statp->_u._ext.ext->nsaddrs[0]);
407 cp = buf + sizeof("nameserver") - 1;
408 while (*cp == ' ' || *cp == '\t')
410 cp[strcspn(cp, ";# \t\n")] = '\0';
411 if ((*cp != '\0') && (*cp != '\n')) {
412 memset(&hints, 0, sizeof(hints));
413 hints.ai_family = PF_UNSPEC;
414 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
415 hints.ai_flags = AI_NUMERICHOST;
416 sprintf(sbuf, "%u", NAMESERVER_PORT);
417 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
418 ai->ai_addrlen <= minsiz) {
419 if (statp->_u._ext.ext != NULL) {
420 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
421 ai->ai_addr, ai->ai_addrlen);
423 if (ai->ai_addrlen <=
424 sizeof(statp->nsaddr_list[nserv])) {
425 memcpy(&statp->nsaddr_list[nserv],
426 ai->ai_addr, ai->ai_addrlen);
428 statp->nsaddr_list[nserv].sin_family = 0;
436 if (MATCH(buf, "sortlist")) {
441 struct __res_state_ext *ext = statp->_u._ext.ext;
443 cp = buf + sizeof("sortlist") - 1;
444 while (nsort < MAXRESOLVSORT) {
445 while (*cp == ' ' || *cp == '\t')
447 if (*cp == '\0' || *cp == '\n' || *cp == ';')
450 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
451 isascii(*cp) && !isspace((unsigned char)*cp))
455 if (inet_aton(net, &a)) {
456 statp->sort_list[nsort].addr = a;
460 while (*cp && *cp != ';' &&
462 !isspace((unsigned char)*cp))
466 if (inet_aton(net, &a)) {
467 statp->sort_list[nsort].mask = a.s_addr;
469 statp->sort_list[nsort].mask =
470 net_mask(statp->sort_list[nsort].addr);
473 statp->sort_list[nsort].mask =
474 net_mask(statp->sort_list[nsort].addr);
476 ext->sort_list[nsort].af = AF_INET;
477 ext->sort_list[nsort].addr.ina =
478 statp->sort_list[nsort].addr;
479 ext->sort_list[nsort].mask.ina.s_addr =
480 statp->sort_list[nsort].mask;
483 else if (inet_pton(AF_INET6, net, &a6) == 1) {
485 ext->sort_list[nsort].af = AF_INET6;
486 ext->sort_list[nsort].addr.in6a = a6;
487 u = (u_char *)&ext->sort_list[nsort].mask.in6a;
490 while (*cp && *cp != ';' &&
491 isascii(*cp) && !isspace(*cp))
501 if (inet_pton(AF_INET6, net, u) == 1) {
507 m = sizeof(struct in6_addr) * CHAR_BIT;
511 for (i = 0; i < sizeof(struct in6_addr); i++) {
523 statp->sort_list[nsort].addr.s_addr =
524 (u_int32_t)0xffffffff;
525 statp->sort_list[nsort].mask =
526 (u_int32_t)0xffffffff;
534 if (MATCH(buf, "options")) {
535 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
540 statp->nscount = nserv;
542 statp->nsort = nsort;
547 * Last chance to get a nameserver. This should not normally
550 #ifdef NO_RESOLV_CONF
552 nserv = get_nameservers(statp);
555 if (statp->defdname[0] == 0 &&
556 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
557 (cp = strchr(buf, '.')) != NULL)
558 strcpy(statp->defdname, cp + 1);
560 /* find components of local domain that might be searched */
561 if (havesearch == 0) {
563 *pp++ = statp->defdname;
567 for (cp = statp->defdname; *cp; cp++)
568 dots += (*cp == '.');
570 cp = statp->defdname;
571 while (pp < statp->dnsrch + MAXDFLSRCH) {
572 if (dots < LOCALDOMAINPARTS)
574 cp = strchr(cp, '.') + 1; /*%< we know there is one */
580 if (statp->options & RES_DEBUG) {
581 printf(";; res_init()... default dnsrch list:\n");
582 for (pp = statp->dnsrch; *pp; pp++)
583 printf(";;\t%s\n", *pp);
584 printf(";;\t..END..\n");
590 statp->options |= RES_NOALIASES;
591 else if ((cp = getenv("RES_OPTIONS")) != NULL)
592 res_setoptions(statp, cp, "env");
593 statp->options |= RES_INIT;
594 return (statp->res_h_errno);
598 res_setoptions(res_state statp, const char *options, const char *source)
600 const char *cp = options;
603 struct __res_state_ext *ext = statp->_u._ext.ext;
607 if (statp->options & RES_DEBUG)
608 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
612 /* skip leading and inner runs of spaces */
613 while (*cp == ' ' || *cp == '\t')
615 /* search for and process individual options */
616 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
617 i = atoi(cp + sizeof("ndots:") - 1);
618 if (i <= RES_MAXNDOTS)
621 statp->ndots = RES_MAXNDOTS;
623 if (statp->options & RES_DEBUG)
624 printf(";;\tndots=%d\n", statp->ndots);
626 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
627 i = atoi(cp + sizeof("timeout:") - 1);
628 if (i <= RES_MAXRETRANS)
631 statp->retrans = RES_MAXRETRANS;
633 if (statp->options & RES_DEBUG)
634 printf(";;\ttimeout=%d\n", statp->retrans);
637 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
639 * For backward compatibility, 'retrans' is
640 * supported as an alias for 'timeout', though
641 * without an imposed maximum.
643 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
644 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
646 * For backward compatibility, 'retry' is
647 * supported as an alias for 'attempts', though
648 * without an imposed maximum.
650 statp->retry = atoi(cp + sizeof("retry:") - 1);
651 #endif /* SOLARIS2 */
652 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
653 i = atoi(cp + sizeof("attempts:") - 1);
654 if (i <= RES_MAXRETRY)
657 statp->retry = RES_MAXRETRY;
659 if (statp->options & RES_DEBUG)
660 printf(";;\tattempts=%d\n", statp->retry);
662 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
664 if (!(statp->options & RES_DEBUG)) {
665 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
667 statp->options |= RES_DEBUG;
669 printf(";;\tdebug\n");
671 } else if (!strncmp(cp, "no_tld_query",
672 sizeof("no_tld_query") - 1) ||
673 !strncmp(cp, "no-tld-query",
674 sizeof("no-tld-query") - 1)) {
675 statp->options |= RES_NOTLDQUERY;
676 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
677 statp->options |= RES_USE_INET6;
678 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
679 statp->options |= RES_INSECURE1;
680 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
681 statp->options |= RES_INSECURE2;
682 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
683 statp->options |= RES_ROTATE;
684 } else if (!strncmp(cp, "no-check-names",
685 sizeof("no-check-names") - 1)) {
686 statp->options |= RES_NOCHECKNAME;
687 } else if (!strncmp(cp, "reload-period:",
688 sizeof("reload-period:") - 1)) {
689 statp->reload_period = (u_short)
690 atoi(cp + sizeof("reload-period:") - 1);
693 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
694 statp->options |= RES_USE_EDNS0;
698 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
699 statp->options |= RES_USE_DNAME;
701 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
704 cp += sizeof("nibble:") - 1;
705 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
706 strncpy(ext->nsuffix, cp, i);
707 ext->nsuffix[i] = '\0';
709 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
712 cp += sizeof("nibble2:") - 1;
713 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
714 strncpy(ext->nsuffix2, cp, i);
715 ext->nsuffix2[i] = '\0';
717 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
718 cp += sizeof("v6revmode:") - 1;
719 /* "nibble" and "bitstring" used to be valid */
720 if (!strncmp(cp, "single", sizeof("single") - 1)) {
721 statp->options |= RES_NO_NIBBLE2;
722 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
729 /* XXX - print a warning here? */
734 /* skip to next run of spaces */
735 while (*cp && *cp != ' ' && *cp != '\t')
741 /* XXX - should really support CIDR which means explicit masks always. */
743 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
745 u_int32_t i = ntohl(in.s_addr);
748 return (htonl(IN_CLASSA_NET));
749 else if (IN_CLASSB(i))
750 return (htonl(IN_CLASSB_NET));
751 return (htonl(IN_CLASSC_NET));
755 static u_char srnd[16];
758 res_rndinit(res_state statp)
763 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
765 gettimeofday(&now, NULL);
767 memcpy(rnd, &u32, 4);
769 memcpy(rnd + 4, &u32, 4);
771 memcpy(rnd + 8, &u32, 4);
773 memcpy(rnd + 12, &u16, 2);
777 res_nrandomid(res_state statp) {
781 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
783 gettimeofday(&now, NULL);
784 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
785 memcpy(rnd + 14, &u16, 2);
788 MD5_Update(&ctx, rnd, 16);
789 MD5_Final(rnd, &ctx);
792 MD5Update(&ctx, rnd, 16);
795 memcpy(&u16, rnd + 14, 2);
796 return ((u_int) u16);
800 * This routine is for closing the socket if a virtual circuit is used and
801 * the program wants to close it. This provides support for endhostent()
802 * which expects to close the socket.
804 * This routine is not expected to be user visible.
807 res_nclose(res_state statp) {
810 if (statp->_vcsock >= 0) {
811 (void) _close(statp->_vcsock);
813 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
815 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
816 if (statp->_u._ext.nssocks[ns] != -1) {
817 (void) _close(statp->_u._ext.nssocks[ns]);
818 statp->_u._ext.nssocks[ns] = -1;
824 res_ndestroy(res_state statp) {
826 if (statp->_u._ext.ext != NULL) {
827 free(statp->_u._ext.ext);
828 statp->_u._ext.ext = NULL;
830 if (statp->_rnd != NULL) {
834 statp->options &= ~RES_INIT;
839 res_get_nibblesuffix(res_state statp) {
840 if (statp->_u._ext.ext)
841 return (statp->_u._ext.ext->nsuffix);
846 res_get_nibblesuffix2(res_state statp) {
847 if (statp->_u._ext.ext)
848 return (statp->_u._ext.ext->nsuffix2);
854 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
858 /* close open servers */
861 /* cause rtt times to be forgotten */
862 statp->_u._ext.nscount = 0;
865 for (i = 0; i < cnt && nserv < MAXNS; i++) {
866 switch (set->sin.sin_family) {
868 size = sizeof(set->sin);
869 if (statp->_u._ext.ext)
870 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
872 if (size <= sizeof(statp->nsaddr_list[nserv]))
873 memcpy(&statp->nsaddr_list[nserv],
876 statp->nsaddr_list[nserv].sin_family = 0;
880 #ifdef HAS_INET6_STRUCTS
882 size = sizeof(set->sin6);
883 if (statp->_u._ext.ext)
884 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
886 if (size <= sizeof(statp->nsaddr_list[nserv]))
887 memcpy(&statp->nsaddr_list[nserv],
890 statp->nsaddr_list[nserv].sin_family = 0;
900 statp->nscount = nserv;
905 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
910 for (i = 0; i < statp->nscount && i < cnt; i++) {
911 if (statp->_u._ext.ext)
912 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
914 family = statp->nsaddr_list[i].sin_family;
918 size = sizeof(set->sin);
919 if (statp->_u._ext.ext)
921 &statp->_u._ext.ext->nsaddrs[i],
924 memcpy(&set->sin, &statp->nsaddr_list[i],
928 #ifdef HAS_INET6_STRUCTS
930 size = sizeof(set->sin6);
931 if (statp->_u._ext.ext)
933 &statp->_u._ext.ext->nsaddrs[i],
936 memcpy(&set->sin6, &statp->nsaddr_list[i],
942 set->sin.sin_family = 0;
947 return (statp->nscount);