2 * SPDX-License-Identifier: (BSD-3-Clause AND ISC)
4 * Copyright (c) 1985, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
35 * Permission to use, copy, modify, and distribute this software for any
36 * purpose with or without fee is hereby granted, provided that the above
37 * copyright notice and this permission notice appear in all copies, and that
38 * the name of Digital Equipment Corporation not be used in advertising or
39 * publicity pertaining to distribution of the document or software without
40 * specific, written prior permission.
42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
54 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
56 * Permission to use, copy, modify, and distribute this software for any
57 * purpose with or without fee is hereby granted, provided that the above
58 * copyright notice and this permission notice appear in all copies.
60 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
61 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
62 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
63 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
64 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
65 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
66 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
69 #if defined(LIBC_SCCS) && !defined(lint)
70 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
71 static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $";
72 #endif /* LIBC_SCCS and not lint */
73 #include <sys/cdefs.h>
74 __FBSDID("$FreeBSD$");
76 #include "port_before.h"
78 #include "namespace.h"
80 #include <sys/param.h>
81 #include <sys/socket.h>
85 #include <netinet/in.h>
86 #include <arpa/inet.h>
87 #include <arpa/nameser.h>
97 # include "../dst/md5.h"
100 # include <sys/md5.h>
106 # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
109 #include "un-namespace.h"
111 #include "port_after.h"
113 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
116 #include "res_private.h"
118 /*% Options. Should all be left alone. */
125 #include <sys/systeminfo.h>
128 static void res_setoptions(res_state, const char *, const char *);
131 static const char sort_mask[] = "/&";
132 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
133 static u_int32_t net_mask(struct in_addr);
136 #if !defined(isascii) /*%< XXX - could be a function */
137 # define isascii(c) (!(c & 0200))
141 * Resolver state default settings.
145 * Set up default settings. If the configuration file exist, the values
146 * there will have precedence. Otherwise, the server address is set to
147 * INADDR_ANY and the default domain name comes from the gethostname().
149 * An interim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
150 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
151 * since it was noted that INADDR_ANY actually meant ``the first interface
152 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
153 * it had to be "up" in order for you to reach your own name server. It
154 * was later decided that since the recommended practice is to always
155 * install local static routes through 127.0.0.1 for all your network
156 * interfaces, that we could solve this problem without a code change.
158 * The configuration file should always be used, since it is the only way
159 * to specify a default domain. If you are running a server on your local
160 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
161 * in the configuration file.
163 * Return 0 if completes successfully, -1 on error
166 res_ninit(res_state statp) {
167 extern int __res_vinit(res_state, int);
169 return (__res_vinit(statp, 0));
172 /*% This function has to be reachable by res_data.c but not publicly. */
174 __res_vinit(res_state statp, int preinit) {
179 int nserv = 0; /*%< number of nameserver records read from file */
187 union res_sockaddr_union u[2];
190 RES_SET_H_ERRNO(statp, 0);
191 if (statp->_u._ext.ext != NULL)
195 statp->retrans = RES_TIMEOUT;
196 statp->retry = RES_DFLRETRY;
197 statp->options = RES_DEFAULT;
200 statp->_rnd = malloc(16);
202 statp->id = res_nrandomid(statp);
204 memset(u, 0, sizeof(u));
206 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
208 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
210 u[nserv].sin.sin_family = AF_INET;
211 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
213 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
216 #ifdef HAS_INET6_STRUCTS
218 u[nserv].sin6.sin6_addr = in6addr_loopback;
220 u[nserv].sin6.sin6_addr = in6addr_any;
222 u[nserv].sin6.sin6_family = AF_INET6;
223 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
225 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
236 statp->_u._ext.nscount = 0;
237 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
238 if (statp->_u._ext.ext != NULL) {
239 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
240 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
241 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
242 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
243 statp->_u._ext.ext->reload_period = 2;
246 * Historically res_init() rarely, if at all, failed.
247 * Examples and applications exist which do not check
248 * our return code. Furthermore several applications
249 * simply call us to get the systems domainname. So
250 * rather then immediately fail here we store the
251 * failure, which is returned later, in h_errno. And
252 * prevent the collection of 'nameserver' information
253 * by setting maxns to 0. Thus applications that fail
254 * to check our return code wont be able to make
257 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
263 res_setservers(statp, u, nserv);
267 * The old libresolv derived the defaultdomain from NIS/NIS+.
268 * We want to keep this behaviour
271 char buf[sizeof(statp->defdname)], *cp;
274 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
275 (unsigned int)ret <= sizeof(buf)) {
278 cp = strchr(buf, '.');
279 cp = (cp == NULL) ? buf : (cp + 1);
280 strncpy(statp->defdname, cp,
281 sizeof(statp->defdname) - 1);
282 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
285 #endif /* SOLARIS2 */
287 /* Allow user to override the local domain definition */
288 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
289 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
290 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
294 * Set search list to be blank-separated strings
295 * from rest of env value. Permits users of LOCALDOMAIN
296 * to still have a search list, and anyone to set the
297 * one that they want to use as an individual (even more
298 * important now that the rfc1535 stuff restricts searches)
300 cp = statp->defdname;
303 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
304 if (*cp == '\n') /*%< silly backwards compat */
306 else if (*cp == ' ' || *cp == '\t') {
315 /* null terminate last domain if there are excess */
316 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
322 #define MATCH(line, name) \
323 (!strncmp(line, name, sizeof(name) - 1) && \
324 (line[sizeof(name) - 1] == ' ' || \
325 line[sizeof(name) - 1] == '\t'))
328 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
332 if (statp->_u._ext.ext != NULL) {
333 if (_fstat(fileno(fp), &sb) == 0) {
334 statp->_u._ext.ext->conf_mtim = sb.st_mtim;
335 if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
336 statp->_u._ext.ext->conf_stat = now.tv_sec;
341 /* read the config file */
342 while (fgets(buf, sizeof(buf), fp) != NULL) {
344 if (*buf == ';' || *buf == '#')
346 /* read default domain name */
347 if (MATCH(buf, "domain")) {
348 if (haveenv) /*%< skip if have from environ */
350 cp = buf + sizeof("domain") - 1;
351 while (*cp == ' ' || *cp == '\t')
353 if ((*cp == '\0') || (*cp == '\n'))
355 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
356 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
357 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
362 /* set search list */
363 if (MATCH(buf, "search")) {
364 if (haveenv) /*%< skip if have from environ */
366 cp = buf + sizeof("search") - 1;
367 while (*cp == ' ' || *cp == '\t')
369 if ((*cp == '\0') || (*cp == '\n'))
371 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
372 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
373 if ((cp = strchr(statp->defdname, '\n')) != NULL)
376 * Set search list to be blank-separated strings
379 cp = statp->defdname;
382 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
383 if (*cp == ' ' || *cp == '\t') {
391 /* null terminate last domain if there are excess */
392 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
399 /* read nameservers to query */
400 if (MATCH(buf, "nameserver") && nserv < maxns) {
401 struct addrinfo hints, *ai;
402 char sbuf[NI_MAXSERV];
403 const size_t minsiz =
404 sizeof(statp->_u._ext.ext->nsaddrs[0]);
406 cp = buf + sizeof("nameserver") - 1;
407 while (*cp == ' ' || *cp == '\t')
409 cp[strcspn(cp, ";# \t\n")] = '\0';
410 if ((*cp != '\0') && (*cp != '\n')) {
411 memset(&hints, 0, sizeof(hints));
412 hints.ai_family = PF_UNSPEC;
413 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
414 hints.ai_flags = AI_NUMERICHOST;
415 sprintf(sbuf, "%u", NAMESERVER_PORT);
416 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0) {
417 if (ai->ai_addrlen <= minsiz) {
418 if (statp->_u._ext.ext != NULL) {
419 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
420 ai->ai_addr, ai->ai_addrlen);
422 if (ai->ai_addrlen <=
423 sizeof(statp->nsaddr_list[nserv])) {
424 memcpy(&statp->nsaddr_list[nserv],
425 ai->ai_addr, ai->ai_addrlen);
427 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;
602 struct __res_state_ext *ext = statp->_u._ext.ext;
605 if (statp->options & RES_DEBUG)
606 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
610 /* skip leading and inner runs of spaces */
611 while (*cp == ' ' || *cp == '\t')
613 /* search for and process individual options */
614 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
615 i = atoi(cp + sizeof("ndots:") - 1);
616 if (i <= RES_MAXNDOTS)
619 statp->ndots = RES_MAXNDOTS;
621 if (statp->options & RES_DEBUG)
622 printf(";;\tndots=%d\n", statp->ndots);
624 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
625 i = atoi(cp + sizeof("timeout:") - 1);
626 if (i <= RES_MAXRETRANS)
629 statp->retrans = RES_MAXRETRANS;
631 if (statp->options & RES_DEBUG)
632 printf(";;\ttimeout=%d\n", statp->retrans);
635 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
637 * For backward compatibility, 'retrans' is
638 * supported as an alias for 'timeout', though
639 * without an imposed maximum.
641 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
642 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
644 * For backward compatibility, 'retry' is
645 * supported as an alias for 'attempts', though
646 * without an imposed maximum.
648 statp->retry = atoi(cp + sizeof("retry:") - 1);
649 #endif /* SOLARIS2 */
650 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
651 i = atoi(cp + sizeof("attempts:") - 1);
652 if (i <= RES_MAXRETRY)
655 statp->retry = RES_MAXRETRY;
657 if (statp->options & RES_DEBUG)
658 printf(";;\tattempts=%d\n", statp->retry);
660 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
662 if (!(statp->options & RES_DEBUG)) {
663 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
665 statp->options |= RES_DEBUG;
667 printf(";;\tdebug\n");
669 } else if (!strncmp(cp, "no_tld_query",
670 sizeof("no_tld_query") - 1) ||
671 !strncmp(cp, "no-tld-query",
672 sizeof("no-tld-query") - 1)) {
673 statp->options |= RES_NOTLDQUERY;
674 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
675 statp->options |= RES_USE_INET6;
676 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
677 statp->options |= RES_INSECURE1;
678 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
679 statp->options |= RES_INSECURE2;
680 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
681 statp->options |= RES_ROTATE;
682 } else if (!strncmp(cp, "usevc", sizeof("usevc") - 1)) {
683 statp->options |= RES_USEVC;
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)) {
690 ext->reload_period = (u_short)
691 atoi(cp + sizeof("reload-period:") - 1);
695 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
696 statp->options |= RES_USE_EDNS0;
700 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
701 statp->options |= RES_USE_DNAME;
703 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
706 cp += sizeof("nibble:") - 1;
707 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
708 strncpy(ext->nsuffix, cp, i);
709 ext->nsuffix[i] = '\0';
711 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
714 cp += sizeof("nibble2:") - 1;
715 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
716 strncpy(ext->nsuffix2, cp, i);
717 ext->nsuffix2[i] = '\0';
719 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
720 cp += sizeof("v6revmode:") - 1;
721 /* "nibble" and "bitstring" used to be valid */
722 if (!strncmp(cp, "single", sizeof("single") - 1)) {
723 statp->options |= RES_NO_NIBBLE2;
724 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
731 /* XXX - print a warning here? */
736 /* skip to next run of spaces */
737 while (*cp && *cp != ' ' && *cp != '\t')
743 /* XXX - should really support CIDR which means explicit masks always. */
745 net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
747 u_int32_t i = ntohl(in.s_addr);
750 return (htonl(IN_CLASSA_NET));
751 else if (IN_CLASSB(i))
752 return (htonl(IN_CLASSB_NET));
753 return (htonl(IN_CLASSC_NET));
757 static u_char srnd[16];
760 res_rndinit(res_state statp)
765 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
767 gettimeofday(&now, NULL);
769 memcpy(rnd, &u32, 4);
771 memcpy(rnd + 4, &u32, 4);
773 memcpy(rnd + 8, &u32, 4);
775 memcpy(rnd + 12, &u16, 2);
779 res_nrandomid(res_state statp) {
783 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
785 gettimeofday(&now, NULL);
786 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
787 memcpy(rnd + 14, &u16, 2);
790 MD5_Update(&ctx, rnd, 16);
791 MD5_Final(rnd, &ctx);
794 MD5Update(&ctx, rnd, 16);
797 memcpy(&u16, rnd + 14, 2);
798 return ((u_int) u16);
802 * This routine is for closing the socket if a virtual circuit is used and
803 * the program wants to close it. This provides support for endhostent()
804 * which expects to close the socket.
806 * This routine is not expected to be user visible.
809 res_nclose(res_state statp) {
812 if (statp->_vcsock >= 0) {
813 (void) _close(statp->_vcsock);
815 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
817 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
818 if (statp->_u._ext.nssocks[ns] != -1) {
819 (void) _close(statp->_u._ext.nssocks[ns]);
820 statp->_u._ext.nssocks[ns] = -1;
826 res_ndestroy(res_state statp) {
828 if (statp->_u._ext.ext != NULL) {
829 free(statp->_u._ext.ext);
830 statp->_u._ext.ext = NULL;
832 if (statp->_rnd != NULL) {
836 statp->options &= ~RES_INIT;
841 res_get_nibblesuffix(res_state statp) {
842 if (statp->_u._ext.ext)
843 return (statp->_u._ext.ext->nsuffix);
848 res_get_nibblesuffix2(res_state statp) {
849 if (statp->_u._ext.ext)
850 return (statp->_u._ext.ext->nsuffix2);
856 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
860 /* close open servers */
863 /* cause rtt times to be forgotten */
864 statp->_u._ext.nscount = 0;
867 for (i = 0; i < cnt && nserv < MAXNS; i++) {
868 switch (set->sin.sin_family) {
870 size = sizeof(set->sin);
871 if (statp->_u._ext.ext)
872 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
874 if (size <= sizeof(statp->nsaddr_list[nserv]))
875 memcpy(&statp->nsaddr_list[nserv],
878 statp->nsaddr_list[nserv].sin_family = 0;
882 #ifdef HAS_INET6_STRUCTS
884 size = sizeof(set->sin6);
885 if (statp->_u._ext.ext)
886 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
888 if (size <= sizeof(statp->nsaddr_list[nserv]))
889 memcpy(&statp->nsaddr_list[nserv],
892 statp->nsaddr_list[nserv].sin_family = 0;
902 statp->nscount = nserv;
907 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
912 for (i = 0; i < statp->nscount && i < cnt; i++) {
913 if (statp->_u._ext.ext)
914 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
916 family = statp->nsaddr_list[i].sin_family;
920 size = sizeof(set->sin);
921 if (statp->_u._ext.ext)
923 &statp->_u._ext.ext->nsaddrs[i],
926 memcpy(&set->sin, &statp->nsaddr_list[i],
930 #ifdef HAS_INET6_STRUCTS
932 size = sizeof(set->sin6);
933 if (statp->_u._ext.ext)
935 &statp->_u._ext.ext->nsaddrs[i],
938 memcpy(&set->sin6, &statp->nsaddr_list[i],
944 set->sin.sin_family = 0;
949 return (statp->nscount);