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>
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. */
121 #include <sys/systeminfo.h>
124 static void res_setoptions(res_state, const char *, const char *);
127 static const char sort_mask[] = "/&";
128 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
129 static u_int32_t net_mask(struct in_addr);
132 #if !defined(isascii) /*%< XXX - could be a function */
133 # define isascii(c) (!(c & 0200))
137 * Resolver state default settings.
141 * Set up default settings. If the configuration file exist, the values
142 * there will have precedence. Otherwise, the server address is set to
143 * INADDR_ANY and the default domain name comes from the gethostname().
145 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
146 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
147 * since it was noted that INADDR_ANY actually meant ``the first interface
148 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
149 * it had to be "up" in order for you to reach your own name server. It
150 * was later decided that since the recommended practice is to always
151 * install local static routes through 127.0.0.1 for all your network
152 * interfaces, that we could solve this problem without a code change.
154 * The configuration file should always be used, since it is the only way
155 * to specify a default domain. If you are running a server on your local
156 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
157 * in the configuration file.
159 * Return 0 if completes successfully, -1 on error
162 res_ninit(res_state statp) {
163 extern int __res_vinit(res_state, int);
165 return (__res_vinit(statp, 0));
168 /*% This function has to be reachable by res_data.c but not publically. */
170 __res_vinit(res_state statp, int preinit) {
175 int nserv = 0; /*%< number of nameserver records read from file */
183 union res_sockaddr_union u[2];
186 RES_SET_H_ERRNO(statp, 0);
187 if (statp->_u._ext.ext != NULL)
191 statp->retrans = RES_TIMEOUT;
192 statp->retry = RES_DFLRETRY;
193 statp->options = RES_DEFAULT;
196 statp->_rnd = malloc(16);
198 statp->id = res_nrandomid(statp);
200 memset(u, 0, sizeof(u));
202 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
204 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
206 u[nserv].sin.sin_family = AF_INET;
207 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
209 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
212 #ifdef HAS_INET6_STRUCTS
214 u[nserv].sin6.sin6_addr = in6addr_loopback;
216 u[nserv].sin6.sin6_addr = in6addr_any;
218 u[nserv].sin6.sin6_family = AF_INET6;
219 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
221 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
232 statp->_u._ext.nscount = 0;
233 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
234 if (statp->_u._ext.ext != NULL) {
235 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
236 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
237 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
238 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
241 * Historically res_init() rarely, if at all, failed.
242 * Examples and applications exist which do not check
243 * our return code. Furthermore several applications
244 * simply call us to get the systems domainname. So
245 * rather then immediately fail here we store the
246 * failure, which is returned later, in h_errno. And
247 * prevent the collection of 'nameserver' information
248 * by setting maxns to 0. Thus applications that fail
249 * to check our return code wont be able to make
252 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
258 res_setservers(statp, u, nserv);
262 * The old libresolv derived the defaultdomain from NIS/NIS+.
263 * We want to keep this behaviour
266 char buf[sizeof(statp->defdname)], *cp;
269 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
270 (unsigned int)ret <= sizeof(buf)) {
273 cp = strchr(buf, '.');
274 cp = (cp == NULL) ? buf : (cp + 1);
275 strncpy(statp->defdname, cp,
276 sizeof(statp->defdname) - 1);
277 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
280 #endif /* SOLARIS2 */
282 /* Allow user to override the local domain definition */
283 if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
284 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
285 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
289 * Set search list to be blank-separated strings
290 * from rest of env value. Permits users of LOCALDOMAIN
291 * to still have a search list, and anyone to set the
292 * one that they want to use as an individual (even more
293 * important now that the rfc1535 stuff restricts searches)
295 cp = statp->defdname;
298 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
299 if (*cp == '\n') /*%< silly backwards compat */
301 else if (*cp == ' ' || *cp == '\t') {
310 /* null terminate last domain if there are excess */
311 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
317 #define MATCH(line, name) \
318 (!strncmp(line, name, sizeof(name) - 1) && \
319 (line[sizeof(name) - 1] == ' ' || \
320 line[sizeof(name) - 1] == '\t'))
323 if ((fp = fopen(_PATH_RESCONF, "re")) != NULL) {
324 /* read the config file */
325 while (fgets(buf, sizeof(buf), fp) != NULL) {
327 if (*buf == ';' || *buf == '#')
329 /* read default domain name */
330 if (MATCH(buf, "domain")) {
331 if (haveenv) /*%< skip if have from environ */
333 cp = buf + sizeof("domain") - 1;
334 while (*cp == ' ' || *cp == '\t')
336 if ((*cp == '\0') || (*cp == '\n'))
338 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
339 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
340 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
345 /* set search list */
346 if (MATCH(buf, "search")) {
347 if (haveenv) /*%< skip if have from environ */
349 cp = buf + sizeof("search") - 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 = strchr(statp->defdname, '\n')) != NULL)
359 * Set search list to be blank-separated strings
362 cp = statp->defdname;
365 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
366 if (*cp == ' ' || *cp == '\t') {
374 /* null terminate last domain if there are excess */
375 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
382 /* read nameservers to query */
383 if (MATCH(buf, "nameserver") && nserv < maxns) {
384 struct addrinfo hints, *ai;
385 char sbuf[NI_MAXSERV];
386 const size_t minsiz =
387 sizeof(statp->_u._ext.ext->nsaddrs[0]);
389 cp = buf + sizeof("nameserver") - 1;
390 while (*cp == ' ' || *cp == '\t')
392 cp[strcspn(cp, ";# \t\n")] = '\0';
393 if ((*cp != '\0') && (*cp != '\n')) {
394 memset(&hints, 0, sizeof(hints));
395 hints.ai_family = PF_UNSPEC;
396 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
397 hints.ai_flags = AI_NUMERICHOST;
398 sprintf(sbuf, "%u", NAMESERVER_PORT);
399 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
400 ai->ai_addrlen <= minsiz) {
401 if (statp->_u._ext.ext != NULL) {
402 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
403 ai->ai_addr, ai->ai_addrlen);
405 if (ai->ai_addrlen <=
406 sizeof(statp->nsaddr_list[nserv])) {
407 memcpy(&statp->nsaddr_list[nserv],
408 ai->ai_addr, ai->ai_addrlen);
410 statp->nsaddr_list[nserv].sin_family = 0;
418 if (MATCH(buf, "sortlist")) {
423 struct __res_state_ext *ext = statp->_u._ext.ext;
425 cp = buf + sizeof("sortlist") - 1;
426 while (nsort < MAXRESOLVSORT) {
427 while (*cp == ' ' || *cp == '\t')
429 if (*cp == '\0' || *cp == '\n' || *cp == ';')
432 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
433 isascii(*cp) && !isspace((unsigned char)*cp))
437 if (inet_aton(net, &a)) {
438 statp->sort_list[nsort].addr = a;
442 while (*cp && *cp != ';' &&
444 !isspace((unsigned char)*cp))
448 if (inet_aton(net, &a)) {
449 statp->sort_list[nsort].mask = a.s_addr;
451 statp->sort_list[nsort].mask =
452 net_mask(statp->sort_list[nsort].addr);
455 statp->sort_list[nsort].mask =
456 net_mask(statp->sort_list[nsort].addr);
458 ext->sort_list[nsort].af = AF_INET;
459 ext->sort_list[nsort].addr.ina =
460 statp->sort_list[nsort].addr;
461 ext->sort_list[nsort].mask.ina.s_addr =
462 statp->sort_list[nsort].mask;
465 else if (inet_pton(AF_INET6, net, &a6) == 1) {
467 ext->sort_list[nsort].af = AF_INET6;
468 ext->sort_list[nsort].addr.in6a = a6;
469 u = (u_char *)&ext->sort_list[nsort].mask.in6a;
472 while (*cp && *cp != ';' &&
473 isascii(*cp) && !isspace(*cp))
483 if (inet_pton(AF_INET6, net, u) == 1) {
489 m = sizeof(struct in6_addr) * CHAR_BIT;
493 for (i = 0; i < sizeof(struct in6_addr); i++) {
505 statp->sort_list[nsort].addr.s_addr =
506 (u_int32_t)0xffffffff;
507 statp->sort_list[nsort].mask =
508 (u_int32_t)0xffffffff;
516 if (MATCH(buf, "options")) {
517 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
522 statp->nscount = nserv;
524 statp->nsort = nsort;
529 * Last chance to get a nameserver. This should not normally
532 #ifdef NO_RESOLV_CONF
534 nserv = get_nameservers(statp);
537 if (statp->defdname[0] == 0 &&
538 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
539 (cp = strchr(buf, '.')) != NULL)
540 strcpy(statp->defdname, cp + 1);
542 /* find components of local domain that might be searched */
543 if (havesearch == 0) {
545 *pp++ = statp->defdname;
549 for (cp = statp->defdname; *cp; cp++)
550 dots += (*cp == '.');
552 cp = statp->defdname;
553 while (pp < statp->dnsrch + MAXDFLSRCH) {
554 if (dots < LOCALDOMAINPARTS)
556 cp = strchr(cp, '.') + 1; /*%< we know there is one */
562 if (statp->options & RES_DEBUG) {
563 printf(";; res_init()... default dnsrch list:\n");
564 for (pp = statp->dnsrch; *pp; pp++)
565 printf(";;\t%s\n", *pp);
566 printf(";;\t..END..\n");
572 statp->options |= RES_NOALIASES;
573 else if ((cp = getenv("RES_OPTIONS")) != NULL)
574 res_setoptions(statp, cp, "env");
575 statp->options |= RES_INIT;
576 return (statp->res_h_errno);
580 res_setoptions(res_state statp, const char *options, const char *source)
582 const char *cp = options;
585 struct __res_state_ext *ext = statp->_u._ext.ext;
589 if (statp->options & RES_DEBUG)
590 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
594 /* skip leading and inner runs of spaces */
595 while (*cp == ' ' || *cp == '\t')
597 /* search for and process individual options */
598 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
599 i = atoi(cp + sizeof("ndots:") - 1);
600 if (i <= RES_MAXNDOTS)
603 statp->ndots = RES_MAXNDOTS;
605 if (statp->options & RES_DEBUG)
606 printf(";;\tndots=%d\n", statp->ndots);
608 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
609 i = atoi(cp + sizeof("timeout:") - 1);
610 if (i <= RES_MAXRETRANS)
613 statp->retrans = RES_MAXRETRANS;
615 if (statp->options & RES_DEBUG)
616 printf(";;\ttimeout=%d\n", statp->retrans);
619 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
621 * For backward compatibility, 'retrans' is
622 * supported as an alias for 'timeout', though
623 * without an imposed maximum.
625 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
626 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
628 * For backward compatibility, 'retry' is
629 * supported as an alias for 'attempts', though
630 * without an imposed maximum.
632 statp->retry = atoi(cp + sizeof("retry:") - 1);
633 #endif /* SOLARIS2 */
634 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
635 i = atoi(cp + sizeof("attempts:") - 1);
636 if (i <= RES_MAXRETRY)
639 statp->retry = RES_MAXRETRY;
641 if (statp->options & RES_DEBUG)
642 printf(";;\tattempts=%d\n", statp->retry);
644 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
646 if (!(statp->options & RES_DEBUG)) {
647 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
649 statp->options |= RES_DEBUG;
651 printf(";;\tdebug\n");
653 } else if (!strncmp(cp, "no_tld_query",
654 sizeof("no_tld_query") - 1) ||
655 !strncmp(cp, "no-tld-query",
656 sizeof("no-tld-query") - 1)) {
657 statp->options |= RES_NOTLDQUERY;
658 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
659 statp->options |= RES_USE_INET6;
660 } else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
661 statp->options |= RES_INSECURE1;
662 } else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
663 statp->options |= RES_INSECURE2;
664 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
665 statp->options |= RES_ROTATE;
666 } else if (!strncmp(cp, "no-check-names",
667 sizeof("no-check-names") - 1)) {
668 statp->options |= RES_NOCHECKNAME;
671 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
672 statp->options |= RES_USE_EDNS0;
676 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
677 statp->options |= RES_USE_DNAME;
679 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
682 cp += sizeof("nibble:") - 1;
683 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
684 strncpy(ext->nsuffix, cp, i);
685 ext->nsuffix[i] = '\0';
687 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
690 cp += sizeof("nibble2:") - 1;
691 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
692 strncpy(ext->nsuffix2, cp, i);
693 ext->nsuffix2[i] = '\0';
695 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
696 cp += sizeof("v6revmode:") - 1;
697 /* "nibble" and "bitstring" used to be valid */
698 if (!strncmp(cp, "single", sizeof("single") - 1)) {
699 statp->options |= RES_NO_NIBBLE2;
700 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
707 /* XXX - print a warning here? */
712 /* skip to next run of spaces */
713 while (*cp && *cp != ' ' && *cp != '\t')
719 /* XXX - should really support CIDR which means explicit masks always. */
721 net_mask(in) /*!< XXX - should really use system's version of this */
724 u_int32_t i = ntohl(in.s_addr);
727 return (htonl(IN_CLASSA_NET));
728 else if (IN_CLASSB(i))
729 return (htonl(IN_CLASSB_NET));
730 return (htonl(IN_CLASSC_NET));
734 static u_char srnd[16];
737 res_rndinit(res_state statp)
742 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
744 gettimeofday(&now, NULL);
746 memcpy(rnd, &u32, 4);
748 memcpy(rnd + 4, &u32, 4);
750 memcpy(rnd + 8, &u32, 4);
752 memcpy(rnd + 12, &u16, 2);
756 res_nrandomid(res_state statp) {
760 u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
762 gettimeofday(&now, NULL);
763 u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
764 memcpy(rnd + 14, &u16, 2);
767 MD5_Update(&ctx, rnd, 16);
768 MD5_Final(rnd, &ctx);
771 MD5Update(&ctx, rnd, 16);
774 memcpy(&u16, rnd + 14, 2);
775 return ((u_int) u16);
779 * This routine is for closing the socket if a virtual circuit is used and
780 * the program wants to close it. This provides support for endhostent()
781 * which expects to close the socket.
783 * This routine is not expected to be user visible.
786 res_nclose(res_state statp) {
789 if (statp->_vcsock >= 0) {
790 (void) _close(statp->_vcsock);
792 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
794 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
795 if (statp->_u._ext.nssocks[ns] != -1) {
796 (void) _close(statp->_u._ext.nssocks[ns]);
797 statp->_u._ext.nssocks[ns] = -1;
803 res_ndestroy(res_state statp) {
805 if (statp->_u._ext.ext != NULL) {
806 free(statp->_u._ext.ext);
807 statp->_u._ext.ext = NULL;
809 if (statp->_rnd != NULL) {
813 statp->options &= ~RES_INIT;
818 res_get_nibblesuffix(res_state statp) {
819 if (statp->_u._ext.ext)
820 return (statp->_u._ext.ext->nsuffix);
825 res_get_nibblesuffix2(res_state statp) {
826 if (statp->_u._ext.ext)
827 return (statp->_u._ext.ext->nsuffix2);
833 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
837 /* close open servers */
840 /* cause rtt times to be forgotten */
841 statp->_u._ext.nscount = 0;
844 for (i = 0; i < cnt && nserv < MAXNS; i++) {
845 switch (set->sin.sin_family) {
847 size = sizeof(set->sin);
848 if (statp->_u._ext.ext)
849 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
851 if (size <= sizeof(statp->nsaddr_list[nserv]))
852 memcpy(&statp->nsaddr_list[nserv],
855 statp->nsaddr_list[nserv].sin_family = 0;
859 #ifdef HAS_INET6_STRUCTS
861 size = sizeof(set->sin6);
862 if (statp->_u._ext.ext)
863 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
865 if (size <= sizeof(statp->nsaddr_list[nserv]))
866 memcpy(&statp->nsaddr_list[nserv],
869 statp->nsaddr_list[nserv].sin_family = 0;
879 statp->nscount = nserv;
884 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
889 for (i = 0; i < statp->nscount && i < cnt; i++) {
890 if (statp->_u._ext.ext)
891 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
893 family = statp->nsaddr_list[i].sin_family;
897 size = sizeof(set->sin);
898 if (statp->_u._ext.ext)
900 &statp->_u._ext.ext->nsaddrs[i],
903 memcpy(&set->sin, &statp->nsaddr_list[i],
907 #ifdef HAS_INET6_STRUCTS
909 size = sizeof(set->sin6);
910 if (statp->_u._ext.ext)
912 &statp->_u._ext.ext->nsaddrs[i],
915 memcpy(&set->sin6, &statp->nsaddr_list[i],
921 set->sin.sin_family = 0;
926 return (statp->nscount);