res_init.c revision 1.7 1 /* $NetBSD: res_init.c,v 1.7 2006/01/24 17:39:44 christos Exp $ */
2
3 /*
4 * Copyright (c) 1985, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 /*
37 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38 *
39 * Permission to use, copy, modify, and distribute this software for any
40 * purpose with or without fee is hereby granted, provided that the above
41 * copyright notice and this permission notice appear in all copies, and that
42 * the name of Digital Equipment Corporation not be used in advertising or
43 * publicity pertaining to distribution of the document or software without
44 * specific, written prior permission.
45 *
46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53 * SOFTWARE.
54 */
55
56 /*
57 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
58 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
59 *
60 * Permission to use, copy, modify, and distribute this software for any
61 * purpose with or without fee is hereby granted, provided that the above
62 * copyright notice and this permission notice appear in all copies.
63 *
64 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
65 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
66 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
67 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
68 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
69 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
70 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71 */
72
73 #include <sys/cdefs.h>
74 #if defined(LIBC_SCCS) && !defined(lint)
75 #ifdef notdef
76 static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
77 static const char rcsid[] = "Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp";
78 #else
79 __RCSID("$NetBSD: res_init.c,v 1.7 2006/01/24 17:39:44 christos Exp $");
80 #endif
81 #endif /* LIBC_SCCS and not lint */
82
83 #include "port_before.h"
84
85 #include "namespace.h"
86 #include <sys/types.h>
87 #include <sys/param.h>
88 #include <sys/socket.h>
89 #include <sys/time.h>
90
91 #include <netinet/in.h>
92 #include <arpa/inet.h>
93 #include <arpa/nameser.h>
94
95 #include <ctype.h>
96 #include <stdio.h>
97 #include <stdlib.h>
98 #include <string.h>
99 #include <unistd.h>
100 #include <netdb.h>
101
102 #include "port_after.h"
103
104 #if 0
105 #ifdef __weak_alias
106 __weak_alias(res_ninit,_res_ninit)
107 __weak_alias(res_randomid,__res_randomid)
108 __weak_alias(res_nclose,_res_nclose)
109 __weak_alias(res_ndestroy,_res_ndestroy)
110 __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
111 __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
112 __weak_alias(res_getservers,__res_getservers)
113 __weak_alias(res_setservers,__res_setservers)
114 #endif
115 #endif
116
117
118 /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
119 #include <resolv.h>
120
121 #include "res_private.h"
122
123 /* Options. Should all be left alone. */
124 #ifndef DEBUG
125 #define DEBUG
126 #endif
127
128 static void res_setoptions __P((res_state, const char *, const char *));
129
130 static const char sort_mask[] = "/&";
131 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
132 static u_int32_t net_mask __P((struct in_addr));
133
134 #if !defined(isascii) /* XXX - could be a function */
135 # define isascii(c) (!(c & 0200))
136 #endif
137
138 /*
139 * Resolver state default settings.
140 */
141
142 /*
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().
146 *
147 * An interrim 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.
155 *
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.
160 *
161 * Return 0 if completes successfully, -1 on error
162 */
163 int
164 res_ninit(res_state statp) {
165 extern int __res_vinit(res_state, int);
166
167 return (__res_vinit(statp, 0));
168 }
169
170 /* This function has to be reachable by res_data.c but not publically. */
171 int
172 __res_vinit(res_state statp, int preinit) {
173 register FILE *fp;
174 register char *cp, **pp;
175 register int n;
176 char buf[BUFSIZ];
177 int nserv = 0; /* number of nameserver records read from file */
178 int haveenv = 0;
179 int havesearch = 0;
180 int nsort = 0;
181 char *net;
182 int dots;
183 union res_sockaddr_union u[2];
184
185 if (!preinit) {
186 statp->retrans = RES_TIMEOUT;
187 statp->retry = RES_DFLRETRY;
188 statp->options = RES_DEFAULT;
189 statp->id = res_randomid();
190 }
191
192 if ((statp->options & RES_INIT) != 0U)
193 res_ndestroy(statp);
194
195 memset(u, 0, sizeof(u));
196 #ifdef USELOOPBACK
197 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
198 #else
199 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
200 #endif
201 u[nserv].sin.sin_family = AF_INET;
202 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
203 #ifdef HAVE_SA_LEN
204 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
205 #endif
206 nserv++;
207 #ifdef HAS_INET6_STRUCTS
208 #ifdef USELOOPBACK
209 u[nserv].sin6.sin6_addr = in6addr_loopback;
210 #else
211 u[nserv].sin6.sin6_addr = in6addr_any;
212 #endif
213 u[nserv].sin6.sin6_family = AF_INET6;
214 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
215 #ifdef HAVE_SA_LEN
216 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
217 #endif
218 nserv++;
219 #endif
220 statp->nscount = 0;
221 statp->ndots = 1;
222 statp->pfcode = 0;
223 statp->_vcsock = -1;
224 statp->_flags = 0;
225 statp->qhook = NULL;
226 statp->rhook = NULL;
227 statp->_u._ext.nscount = 0;
228 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
229 if (statp->_u._ext.ext != NULL) {
230 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
231 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
232 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
233 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
234 }
235 statp->nsort = 0;
236 res_setservers(statp, u, nserv);
237
238 /* Allow user to override the local domain definition */
239 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
240 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
241 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
242 haveenv++;
243
244 /*
245 * Set search list to be blank-separated strings
246 * from rest of env value. Permits users of LOCALDOMAIN
247 * to still have a search list, and anyone to set the
248 * one that they want to use as an individual (even more
249 * important now that the rfc1535 stuff restricts searches)
250 */
251 cp = statp->defdname;
252 pp = statp->dnsrch;
253 *pp++ = cp;
254 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
255 if (*cp == '\n') /* silly backwards compat */
256 break;
257 else if (*cp == ' ' || *cp == '\t') {
258 *cp = 0;
259 n = 1;
260 } else if (n) {
261 *pp++ = cp;
262 n = 0;
263 havesearch = 1;
264 }
265 }
266 /* null terminate last domain if there are excess */
267 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
268 cp++;
269 *cp = '\0';
270 *pp++ = 0;
271 }
272
273 #define MATCH(line, name) \
274 (!strncmp(line, name, sizeof(name) - 1) && \
275 (line[sizeof(name) - 1] == ' ' || \
276 line[sizeof(name) - 1] == '\t'))
277
278 nserv = 0;
279 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
280 /* read the config file */
281 while (fgets(buf, sizeof(buf), fp) != NULL) {
282 /* skip comments */
283 if (*buf == ';' || *buf == '#')
284 continue;
285 /* read default domain name */
286 if (MATCH(buf, "domain")) {
287 if (haveenv) /* skip if have from environ */
288 continue;
289 cp = buf + sizeof("domain") - 1;
290 while (*cp == ' ' || *cp == '\t')
291 cp++;
292 if ((*cp == '\0') || (*cp == '\n'))
293 continue;
294 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
295 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
296 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
297 *cp = '\0';
298 havesearch = 0;
299 continue;
300 }
301 /* set search list */
302 if (MATCH(buf, "search")) {
303 if (haveenv) /* skip if have from environ */
304 continue;
305 cp = buf + sizeof("search") - 1;
306 while (*cp == ' ' || *cp == '\t')
307 cp++;
308 if ((*cp == '\0') || (*cp == '\n'))
309 continue;
310 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
311 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
312 if ((cp = strchr(statp->defdname, '\n')) != NULL)
313 *cp = '\0';
314 /*
315 * Set search list to be blank-separated strings
316 * on rest of line.
317 */
318 cp = statp->defdname;
319 pp = statp->dnsrch;
320 *pp++ = cp;
321 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
322 if (*cp == ' ' || *cp == '\t') {
323 *cp = 0;
324 n = 1;
325 } else if (n) {
326 *pp++ = cp;
327 n = 0;
328 }
329 }
330 /* null terminate last domain if there are excess */
331 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
332 cp++;
333 *cp = '\0';
334 *pp++ = 0;
335 havesearch = 1;
336 continue;
337 }
338 /* read nameservers to query */
339 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
340 struct addrinfo hints, *ai;
341 char sbuf[NI_MAXSERV];
342 const size_t minsiz =
343 sizeof(statp->_u._ext.ext->nsaddrs[0]);
344
345 cp = buf + sizeof("nameserver") - 1;
346 while (*cp == ' ' || *cp == '\t')
347 cp++;
348 cp[strcspn(cp, ";# \t\n")] = '\0';
349 if ((*cp != '\0') && (*cp != '\n')) {
350 memset(&hints, 0, sizeof(hints));
351 hints.ai_family = PF_UNSPEC;
352 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
353 hints.ai_flags = AI_NUMERICHOST;
354 sprintf(sbuf, "%u", NAMESERVER_PORT);
355 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
356 ai->ai_addrlen <= minsiz) {
357 if (statp->_u._ext.ext != NULL) {
358 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
359 ai->ai_addr, ai->ai_addrlen);
360 }
361 if (ai->ai_addrlen <=
362 sizeof(statp->nsaddr_list[nserv])) {
363 memcpy(&statp->nsaddr_list[nserv],
364 ai->ai_addr, ai->ai_addrlen);
365 } else
366 statp->nsaddr_list[nserv].sin_family = 0;
367 freeaddrinfo(ai);
368 nserv++;
369 }
370 }
371 continue;
372 }
373 if (MATCH(buf, "sortlist")) {
374 struct in_addr a;
375
376 cp = buf + sizeof("sortlist") - 1;
377 while (nsort < MAXRESOLVSORT) {
378 while (*cp == ' ' || *cp == '\t')
379 cp++;
380 if (*cp == '\0' || *cp == '\n' || *cp == ';')
381 break;
382 net = cp;
383 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
384 isascii(*cp) && !isspace((unsigned char)*cp))
385 cp++;
386 n = *cp;
387 *cp = 0;
388 if (inet_aton(net, &a)) {
389 statp->sort_list[nsort].addr = a;
390 if (ISSORTMASK(n)) {
391 *cp++ = n;
392 net = cp;
393 while (*cp && *cp != ';' &&
394 isascii(*cp) &&
395 !isspace((unsigned char)*cp))
396 cp++;
397 n = *cp;
398 *cp = 0;
399 if (inet_aton(net, &a)) {
400 statp->sort_list[nsort].mask = a.s_addr;
401 } else {
402 statp->sort_list[nsort].mask =
403 net_mask(statp->sort_list[nsort].addr);
404 }
405 } else {
406 statp->sort_list[nsort].mask =
407 net_mask(statp->sort_list[nsort].addr);
408 }
409 nsort++;
410 }
411 *cp = n;
412 }
413 continue;
414 }
415 if (MATCH(buf, "options")) {
416 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
417 continue;
418 }
419 }
420 if (nserv > 0)
421 statp->nscount = nserv;
422 statp->nsort = nsort;
423 (void) fclose(fp);
424 }
425 /*
426 * Last chance to get a nameserver. This should not normally
427 * be necessary
428 */
429 #ifdef NO_RESOLV_CONF
430 if(nserv == 0)
431 nserv = get_nameservers(statp);
432 #endif
433
434 if (statp->defdname[0] == 0 &&
435 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
436 (cp = strchr(buf, '.')) != NULL)
437 strcpy(statp->defdname, cp + 1);
438
439 /* find components of local domain that might be searched */
440 if (havesearch == 0) {
441 pp = statp->dnsrch;
442 *pp++ = statp->defdname;
443 *pp = NULL;
444
445 dots = 0;
446 for (cp = statp->defdname; *cp; cp++)
447 dots += (*cp == '.');
448
449 cp = statp->defdname;
450 while (pp < statp->dnsrch + MAXDFLSRCH) {
451 if (dots < LOCALDOMAINPARTS)
452 break;
453 cp = strchr(cp, '.') + 1; /* we know there is one */
454 *pp++ = cp;
455 dots--;
456 }
457 *pp = NULL;
458 #ifdef DEBUG
459 if (statp->options & RES_DEBUG) {
460 printf(";; res_init()... default dnsrch list:\n");
461 for (pp = statp->dnsrch; *pp; pp++)
462 printf(";;\t%s\n", *pp);
463 printf(";;\t..END..\n");
464 }
465 #endif
466 }
467
468 if ((cp = getenv("RES_OPTIONS")) != NULL)
469 res_setoptions(statp, cp, "env");
470 statp->options |= RES_INIT;
471 return (0);
472 }
473
474 static void
475 res_setoptions(res_state statp, const char *options, const char *source)
476 {
477 const char *cp = options;
478 int i;
479 struct __res_state_ext *ext = statp->_u._ext.ext;
480
481 #ifdef DEBUG
482 if (statp->options & RES_DEBUG)
483 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
484 options, source);
485 #endif
486 while (*cp) {
487 /* skip leading and inner runs of spaces */
488 while (*cp == ' ' || *cp == '\t')
489 cp++;
490 /* search for and process individual options */
491 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
492 i = atoi(cp + sizeof("ndots:") - 1);
493 if (i <= RES_MAXNDOTS)
494 statp->ndots = i;
495 else
496 statp->ndots = RES_MAXNDOTS;
497 #ifdef DEBUG
498 if (statp->options & RES_DEBUG)
499 printf(";;\tndots=%d\n", statp->ndots);
500 #endif
501 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
502 i = atoi(cp + sizeof("timeout:") - 1);
503 if (i <= RES_MAXRETRANS)
504 statp->retrans = i;
505 else
506 statp->retrans = RES_MAXRETRANS;
507 #ifdef DEBUG
508 if (statp->options & RES_DEBUG)
509 printf(";;\ttimeout=%d\n", statp->retrans);
510 #endif
511 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
512 i = atoi(cp + sizeof("attempts:") - 1);
513 if (i <= RES_MAXRETRY)
514 statp->retry = i;
515 else
516 statp->retry = RES_MAXRETRY;
517 #ifdef DEBUG
518 if (statp->options & RES_DEBUG)
519 printf(";;\tattempts=%d\n", statp->retry);
520 #endif
521 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
522 #ifdef DEBUG
523 if (!(statp->options & RES_DEBUG)) {
524 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
525 options, source);
526 statp->options |= RES_DEBUG;
527 }
528 printf(";;\tdebug\n");
529 #endif
530 } else if (!strncmp(cp, "no_tld_query",
531 sizeof("no_tld_query") - 1) ||
532 !strncmp(cp, "no-tld-query",
533 sizeof("no-tld-query") - 1)) {
534 statp->options |= RES_NOTLDQUERY;
535 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
536 statp->options |= RES_USE_INET6;
537 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
538 statp->options |= RES_ROTATE;
539 } else if (!strncmp(cp, "no-check-names",
540 sizeof("no-check-names") - 1)) {
541 statp->options |= RES_NOCHECKNAME;
542 }
543 #ifdef RES_USE_EDNS0
544 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
545 statp->options |= RES_USE_EDNS0;
546 }
547 #endif
548 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
549 statp->options |= RES_USE_DNAME;
550 }
551 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
552 if (ext == NULL)
553 goto skip;
554 cp += sizeof("nibble:") - 1;
555 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
556 strncpy(ext->nsuffix, cp, (size_t)i);
557 ext->nsuffix[i] = '\0';
558 }
559 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
560 if (ext == NULL)
561 goto skip;
562 cp += sizeof("nibble2:") - 1;
563 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
564 strncpy(ext->nsuffix2, cp, (size_t)i);
565 ext->nsuffix2[i] = '\0';
566 }
567 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
568 cp += sizeof("v6revmode:") - 1;
569 /* "nibble" and "bitstring" used to be valid */
570 if (!strncmp(cp, "single", sizeof("single") - 1)) {
571 statp->options |= RES_NO_NIBBLE2;
572 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
573 statp->options &=
574 ~RES_NO_NIBBLE2;
575 }
576 }
577 else {
578 /* XXX - print a warning here? */
579 }
580 skip:
581 /* skip to next run of spaces */
582 while (*cp && *cp != ' ' && *cp != '\t')
583 cp++;
584 }
585 }
586
587 /* XXX - should really support CIDR which means explicit masks always. */
588 static u_int32_t
589 net_mask(in) /* XXX - should really use system's version of this */
590 struct in_addr in;
591 {
592 register u_int32_t i = ntohl(in.s_addr);
593
594 if (IN_CLASSA(i))
595 return (htonl(IN_CLASSA_NET));
596 else if (IN_CLASSB(i))
597 return (htonl(IN_CLASSB_NET));
598 return (htonl(IN_CLASSC_NET));
599 }
600
601 u_int
602 res_randomid(void) {
603 struct timeval now;
604
605 gettimeofday(&now, NULL);
606 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
607 }
608
609 /*
610 * This routine is for closing the socket if a virtual circuit is used and
611 * the program wants to close it. This provides support for endhostent()
612 * which expects to close the socket.
613 *
614 * This routine is not expected to be user visible.
615 */
616 void
617 res_nclose(res_state statp) {
618 int ns;
619
620 if (statp->_vcsock >= 0) {
621 (void) close(statp->_vcsock);
622 statp->_vcsock = -1;
623 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
624 }
625 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
626 if (statp->_u._ext.nssocks[ns] != -1) {
627 (void) close(statp->_u._ext.nssocks[ns]);
628 statp->_u._ext.nssocks[ns] = -1;
629 }
630 }
631 }
632
633 void
634 res_ndestroy(res_state statp) {
635 res_nclose(statp);
636 if (statp->_u._ext.ext != NULL)
637 free(statp->_u._ext.ext);
638 statp->options &= ~RES_INIT;
639 statp->_u._ext.ext = NULL;
640 }
641
642 const char *
643 res_get_nibblesuffix(res_state statp) {
644 if (statp->_u._ext.ext)
645 return (statp->_u._ext.ext->nsuffix);
646 return ("ip6.arpa");
647 }
648
649 const char *
650 res_get_nibblesuffix2(res_state statp) {
651 if (statp->_u._ext.ext)
652 return (statp->_u._ext.ext->nsuffix2);
653 return ("ip6.int");
654 }
655
656 void
657 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
658 int i, nserv;
659 size_t size;
660
661 /* close open servers */
662 res_nclose(statp);
663
664 /* cause rtt times to be forgotten */
665 statp->_u._ext.nscount = 0;
666
667 nserv = 0;
668 for (i = 0; i < cnt && nserv < MAXNS; i++) {
669 switch (set->sin.sin_family) {
670 case AF_INET:
671 size = sizeof(set->sin);
672 if (statp->_u._ext.ext)
673 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
674 &set->sin, size);
675 if (size <= sizeof(statp->nsaddr_list[nserv]))
676 memcpy(&statp->nsaddr_list[nserv],
677 &set->sin, size);
678 else
679 statp->nsaddr_list[nserv].sin_family = 0;
680 nserv++;
681 break;
682
683 #ifdef HAS_INET6_STRUCTS
684 case AF_INET6:
685 size = sizeof(set->sin6);
686 if (statp->_u._ext.ext)
687 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
688 &set->sin6, size);
689 if (size <= sizeof(statp->nsaddr_list[nserv]))
690 memcpy(&statp->nsaddr_list[nserv],
691 &set->sin6, size);
692 else
693 statp->nsaddr_list[nserv].sin_family = 0;
694 nserv++;
695 break;
696 #endif
697
698 default:
699 break;
700 }
701 set++;
702 }
703 statp->nscount = nserv;
704
705 }
706
707 int
708 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
709 int i;
710 size_t size;
711 u_int16_t family;
712
713 for (i = 0; i < statp->nscount && i < cnt; i++) {
714 if (statp->_u._ext.ext)
715 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
716 else
717 family = statp->nsaddr_list[i].sin_family;
718
719 switch (family) {
720 case AF_INET:
721 size = sizeof(set->sin);
722 if (statp->_u._ext.ext)
723 memcpy(&set->sin,
724 &statp->_u._ext.ext->nsaddrs[i],
725 size);
726 else
727 memcpy(&set->sin, &statp->nsaddr_list[i],
728 size);
729 break;
730
731 #ifdef HAS_INET6_STRUCTS
732 case AF_INET6:
733 size = sizeof(set->sin6);
734 if (statp->_u._ext.ext)
735 memcpy(&set->sin6,
736 &statp->_u._ext.ext->nsaddrs[i],
737 size);
738 else
739 memcpy(&set->sin6, &statp->nsaddr_list[i],
740 size);
741 break;
742 #endif
743
744 default:
745 set->sin.sin_family = 0;
746 break;
747 }
748 set++;
749 }
750 return (statp->nscount);
751 }
752