res_init.c revision 1.12 1 /* $NetBSD: res_init.c,v 1.12 2007/02/09 22:29:40 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 1.16.18.5 2006/08/30 23:23:13 marka Exp";
78 #else
79 __RCSID("$NetBSD: res_init.c,v 1.12 2007/02/09 22:29:40 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 #ifdef SOLARIS2
129 #include <sys/systeminfo.h>
130 #endif
131
132 static void res_setoptions __P((res_state, const char *, const char *));
133
134 static const char sort_mask[] = "/&";
135 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
136 static u_int32_t net_mask __P((struct in_addr));
137
138 #if !defined(isascii) /*%< XXX - could be a function */
139 # define isascii(c) (!(c & 0200))
140 #endif
141
142 /*
143 * Resolver state default settings.
144 */
145
146 /*%
147 * Set up default settings. If the configuration file exist, the values
148 * there will have precedence. Otherwise, the server address is set to
149 * INADDR_ANY and the default domain name comes from the gethostname().
150 *
151 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
152 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
153 * since it was noted that INADDR_ANY actually meant ``the first interface
154 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
155 * it had to be "up" in order for you to reach your own name server. It
156 * was later decided that since the recommended practice is to always
157 * install local static routes through 127.0.0.1 for all your network
158 * interfaces, that we could solve this problem without a code change.
159 *
160 * The configuration file should always be used, since it is the only way
161 * to specify a default domain. If you are running a server on your local
162 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
163 * in the configuration file.
164 *
165 * Return 0 if completes successfully, -1 on error
166 */
167 int
168 res_ninit(res_state statp) {
169 extern int __res_vinit(res_state, int);
170
171 return (__res_vinit(statp, 0));
172 }
173
174 /*% This function has to be reachable by res_data.c but not publically. */
175 int
176 __res_vinit(res_state statp, int preinit) {
177 register FILE *fp;
178 register char *cp, **pp;
179 register int n;
180 char buf[BUFSIZ];
181 int nserv = 0; /*%< number of nameserver records read from file */
182 int haveenv = 0;
183 int havesearch = 0;
184 int nsort = 0;
185 char *net;
186 int dots;
187 union res_sockaddr_union u[2];
188
189 if (!preinit) {
190 statp->retrans = RES_TIMEOUT;
191 statp->retry = RES_DFLRETRY;
192 statp->options = RES_DEFAULT;
193 statp->id = res_randomid();
194 }
195
196 if ((statp->options & RES_INIT) != 0U)
197 res_ndestroy(statp);
198
199 memset(u, 0, sizeof(u));
200 #ifdef USELOOPBACK
201 u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
202 #else
203 u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
204 #endif
205 u[nserv].sin.sin_family = AF_INET;
206 u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
207 #ifdef HAVE_SA_LEN
208 u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
209 #endif
210 nserv++;
211 #ifdef HAS_INET6_STRUCTS
212 #ifdef USELOOPBACK
213 u[nserv].sin6.sin6_addr = in6addr_loopback;
214 #else
215 u[nserv].sin6.sin6_addr = in6addr_any;
216 #endif
217 u[nserv].sin6.sin6_family = AF_INET6;
218 u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
219 #ifdef HAVE_SA_LEN
220 u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
221 #endif
222 nserv++;
223 #endif
224 statp->nscount = 0;
225 statp->ndots = 1;
226 statp->pfcode = 0;
227 statp->_vcsock = -1;
228 statp->_flags = 0;
229 statp->qhook = NULL;
230 statp->rhook = NULL;
231 statp->_u._ext.nscount = 0;
232 statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
233 if (statp->_u._ext.ext != NULL) {
234 memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
235 statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
236 strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
237 strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
238 } else
239 return (-1);
240 statp->nsort = 0;
241 res_setservers(statp, u, nserv);
242
243 #ifdef SOLARIS2
244 /*
245 * The old libresolv derived the defaultdomain from NIS/NIS+.
246 * We want to keep this behaviour
247 */
248 {
249 char buf[sizeof(statp->defdname)], *cp;
250 int ret;
251
252 if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
253 (unsigned int)ret <= sizeof(buf)) {
254 if (buf[0] == '+')
255 buf[0] = '.';
256 cp = strchr(buf, '.');
257 cp = (cp == NULL) ? buf : (cp + 1);
258 if (strlen(cp) >= sizeof(statp->defdname))
259 goto freedata;
260 strcpy(statp->defdname, cp);
261 }
262 }
263 #endif /* SOLARIS2 */
264
265 /* Allow user to override the local domain definition */
266 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
267 (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
268 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
269 haveenv++;
270
271 /*
272 * Set search list to be blank-separated strings
273 * from rest of env value. Permits users of LOCALDOMAIN
274 * to still have a search list, and anyone to set the
275 * one that they want to use as an individual (even more
276 * important now that the rfc1535 stuff restricts searches)
277 */
278 cp = statp->defdname;
279 pp = statp->dnsrch;
280 *pp++ = cp;
281 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
282 if (*cp == '\n') /*%< silly backwards compat */
283 break;
284 else if (*cp == ' ' || *cp == '\t') {
285 *cp = 0;
286 n = 1;
287 } else if (n) {
288 *pp++ = cp;
289 n = 0;
290 havesearch = 1;
291 }
292 }
293 /* null terminate last domain if there are excess */
294 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
295 cp++;
296 *cp = '\0';
297 *pp++ = 0;
298 }
299
300 #define MATCH(line, name) \
301 (!strncmp(line, name, sizeof(name) - 1) && \
302 (line[sizeof(name) - 1] == ' ' || \
303 line[sizeof(name) - 1] == '\t'))
304
305 nserv = 0;
306 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
307 /* read the config file */
308 while (fgets(buf, sizeof(buf), fp) != NULL) {
309 /* skip comments */
310 if (*buf == ';' || *buf == '#')
311 continue;
312 /* read default domain name */
313 if (MATCH(buf, "domain")) {
314 if (haveenv) /*%< skip if have from environ */
315 continue;
316 cp = buf + sizeof("domain") - 1;
317 while (*cp == ' ' || *cp == '\t')
318 cp++;
319 if ((*cp == '\0') || (*cp == '\n'))
320 continue;
321 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
322 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
323 if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
324 *cp = '\0';
325 havesearch = 0;
326 continue;
327 }
328 /* set search list */
329 if (MATCH(buf, "search")) {
330 if (haveenv) /*%< skip if have from environ */
331 continue;
332 cp = buf + sizeof("search") - 1;
333 while (*cp == ' ' || *cp == '\t')
334 cp++;
335 if ((*cp == '\0') || (*cp == '\n'))
336 continue;
337 strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
338 statp->defdname[sizeof(statp->defdname) - 1] = '\0';
339 if ((cp = strchr(statp->defdname, '\n')) != NULL)
340 *cp = '\0';
341 /*
342 * Set search list to be blank-separated strings
343 * on rest of line.
344 */
345 cp = statp->defdname;
346 pp = statp->dnsrch;
347 *pp++ = cp;
348 for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
349 if (*cp == ' ' || *cp == '\t') {
350 *cp = 0;
351 n = 1;
352 } else if (n) {
353 *pp++ = cp;
354 n = 0;
355 }
356 }
357 /* null terminate last domain if there are excess */
358 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
359 cp++;
360 *cp = '\0';
361 *pp++ = 0;
362 havesearch = 1;
363 continue;
364 }
365 /* read nameservers to query */
366 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
367 struct addrinfo hints, *ai;
368 char sbuf[NI_MAXSERV];
369 const size_t minsiz =
370 sizeof(statp->_u._ext.ext->nsaddrs[0]);
371
372 cp = buf + sizeof("nameserver") - 1;
373 while (*cp == ' ' || *cp == '\t')
374 cp++;
375 cp[strcspn(cp, ";# \t\n")] = '\0';
376 if ((*cp != '\0') && (*cp != '\n')) {
377 memset(&hints, 0, sizeof(hints));
378 hints.ai_family = PF_UNSPEC;
379 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
380 hints.ai_flags = AI_NUMERICHOST;
381 sprintf(sbuf, "%u", NAMESERVER_PORT);
382 if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
383 ai->ai_addrlen <= minsiz) {
384 if (statp->_u._ext.ext != NULL) {
385 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
386 ai->ai_addr, ai->ai_addrlen);
387 }
388 if (ai->ai_addrlen <=
389 sizeof(statp->nsaddr_list[nserv])) {
390 memcpy(&statp->nsaddr_list[nserv],
391 ai->ai_addr, ai->ai_addrlen);
392 } else
393 statp->nsaddr_list[nserv].sin_family = 0;
394 freeaddrinfo(ai);
395 nserv++;
396 }
397 }
398 continue;
399 }
400 if (MATCH(buf, "sortlist")) {
401 struct in_addr a;
402
403 cp = buf + sizeof("sortlist") - 1;
404 while (nsort < MAXRESOLVSORT) {
405 while (*cp == ' ' || *cp == '\t')
406 cp++;
407 if (*cp == '\0' || *cp == '\n' || *cp == ';')
408 break;
409 net = cp;
410 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
411 isascii(*cp) && !isspace((unsigned char)*cp))
412 cp++;
413 n = *cp;
414 *cp = 0;
415 if (inet_aton(net, &a)) {
416 statp->sort_list[nsort].addr = a;
417 if (ISSORTMASK(n)) {
418 *cp++ = n;
419 net = cp;
420 while (*cp && *cp != ';' &&
421 isascii(*cp) &&
422 !isspace((unsigned char)*cp))
423 cp++;
424 n = *cp;
425 *cp = 0;
426 if (inet_aton(net, &a)) {
427 statp->sort_list[nsort].mask = a.s_addr;
428 } else {
429 statp->sort_list[nsort].mask =
430 net_mask(statp->sort_list[nsort].addr);
431 }
432 } else {
433 statp->sort_list[nsort].mask =
434 net_mask(statp->sort_list[nsort].addr);
435 }
436 nsort++;
437 }
438 *cp = n;
439 }
440 continue;
441 }
442 if (MATCH(buf, "options")) {
443 res_setoptions(statp, buf + sizeof("options") - 1, "conf");
444 continue;
445 }
446 }
447 if (nserv > 0)
448 statp->nscount = nserv;
449 statp->nsort = nsort;
450 (void) fclose(fp);
451 }
452 /*
453 * Last chance to get a nameserver. This should not normally
454 * be necessary
455 */
456 #ifdef NO_RESOLV_CONF
457 if(nserv == 0)
458 nserv = get_nameservers(statp);
459 #endif
460
461 if (statp->defdname[0] == 0 &&
462 gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
463 (cp = strchr(buf, '.')) != NULL)
464 strcpy(statp->defdname, cp + 1);
465
466 /* find components of local domain that might be searched */
467 if (havesearch == 0) {
468 pp = statp->dnsrch;
469 *pp++ = statp->defdname;
470 *pp = NULL;
471
472 dots = 0;
473 for (cp = statp->defdname; *cp; cp++)
474 dots += (*cp == '.');
475
476 cp = statp->defdname;
477 while (pp < statp->dnsrch + MAXDFLSRCH) {
478 if (dots < LOCALDOMAINPARTS)
479 break;
480 cp = strchr(cp, '.') + 1; /*%< we know there is one */
481 *pp++ = cp;
482 dots--;
483 }
484 *pp = NULL;
485 #ifdef DEBUG
486 if (statp->options & RES_DEBUG) {
487 printf(";; res_init()... default dnsrch list:\n");
488 for (pp = statp->dnsrch; *pp; pp++)
489 printf(";;\t%s\n", *pp);
490 printf(";;\t..END..\n");
491 }
492 #endif
493 }
494
495 if ((cp = getenv("RES_OPTIONS")) != NULL)
496 res_setoptions(statp, cp, "env");
497 statp->options |= RES_INIT;
498 return (0);
499
500 #ifdef SOLARIS2
501 freedata:
502 if (statp->_u._ext.ext != NULL) {
503 free(statp->_u._ext.ext);
504 statp->_u._ext.ext = NULL;
505 }
506 return (-1);
507 #endif
508 }
509
510 static void
511 res_setoptions(res_state statp, const char *options, const char *source)
512 {
513 const char *cp = options;
514 int i;
515 struct __res_state_ext *ext = statp->_u._ext.ext;
516
517 #ifdef DEBUG
518 if (statp->options & RES_DEBUG)
519 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
520 options, source);
521 #endif
522 while (*cp) {
523 /* skip leading and inner runs of spaces */
524 while (*cp == ' ' || *cp == '\t')
525 cp++;
526 /* search for and process individual options */
527 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
528 i = atoi(cp + sizeof("ndots:") - 1);
529 if (i <= RES_MAXNDOTS)
530 statp->ndots = i;
531 else
532 statp->ndots = RES_MAXNDOTS;
533 #ifdef DEBUG
534 if (statp->options & RES_DEBUG)
535 printf(";;\tndots=%d\n", statp->ndots);
536 #endif
537 } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
538 i = atoi(cp + sizeof("timeout:") - 1);
539 if (i <= RES_MAXRETRANS)
540 statp->retrans = i;
541 else
542 statp->retrans = RES_MAXRETRANS;
543 #ifdef DEBUG
544 if (statp->options & RES_DEBUG)
545 printf(";;\ttimeout=%d\n", statp->retrans);
546 #endif
547 #ifdef SOLARIS2
548 } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
549 /*
550 * For backward compatibility, 'retrans' is
551 * supported as an alias for 'timeout', though
552 * without an imposed maximum.
553 */
554 statp->retrans = atoi(cp + sizeof("retrans:") - 1);
555 } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
556 /*
557 * For backward compatibility, 'retry' is
558 * supported as an alias for 'attempts', though
559 * without an imposed maximum.
560 */
561 statp->retry = atoi(cp + sizeof("retry:") - 1);
562 #endif /* SOLARIS2 */
563 } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
564 i = atoi(cp + sizeof("attempts:") - 1);
565 if (i <= RES_MAXRETRY)
566 statp->retry = i;
567 else
568 statp->retry = RES_MAXRETRY;
569 #ifdef DEBUG
570 if (statp->options & RES_DEBUG)
571 printf(";;\tattempts=%d\n", statp->retry);
572 #endif
573 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
574 #ifdef DEBUG
575 if (!(statp->options & RES_DEBUG)) {
576 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
577 options, source);
578 statp->options |= RES_DEBUG;
579 }
580 printf(";;\tdebug\n");
581 #endif
582 } else if (!strncmp(cp, "no_tld_query",
583 sizeof("no_tld_query") - 1) ||
584 !strncmp(cp, "no-tld-query",
585 sizeof("no-tld-query") - 1)) {
586 statp->options |= RES_NOTLDQUERY;
587 } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
588 statp->options |= RES_USE_INET6;
589 } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
590 statp->options |= RES_ROTATE;
591 } else if (!strncmp(cp, "no-check-names",
592 sizeof("no-check-names") - 1)) {
593 statp->options |= RES_NOCHECKNAME;
594 }
595 #ifdef RES_USE_EDNS0
596 else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
597 statp->options |= RES_USE_EDNS0;
598 }
599 #endif
600 else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
601 statp->options |= RES_USE_DNAME;
602 }
603 else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
604 if (ext == NULL)
605 goto skip;
606 cp += sizeof("nibble:") - 1;
607 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
608 strncpy(ext->nsuffix, cp, (size_t)i);
609 ext->nsuffix[i] = '\0';
610 }
611 else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
612 if (ext == NULL)
613 goto skip;
614 cp += sizeof("nibble2:") - 1;
615 i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
616 strncpy(ext->nsuffix2, cp, (size_t)i);
617 ext->nsuffix2[i] = '\0';
618 }
619 else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
620 cp += sizeof("v6revmode:") - 1;
621 /* "nibble" and "bitstring" used to be valid */
622 if (!strncmp(cp, "single", sizeof("single") - 1)) {
623 statp->options |= RES_NO_NIBBLE2;
624 } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
625 statp->options &=
626 ~RES_NO_NIBBLE2;
627 }
628 }
629 else {
630 /* XXX - print a warning here? */
631 }
632 skip:
633 /* skip to next run of spaces */
634 while (*cp && *cp != ' ' && *cp != '\t')
635 cp++;
636 }
637 }
638
639 /* XXX - should really support CIDR which means explicit masks always. */
640 static u_int32_t
641 net_mask(in) /*!< XXX - should really use system's version of this */
642 struct in_addr in;
643 {
644 register u_int32_t i = ntohl(in.s_addr);
645
646 if (IN_CLASSA(i))
647 return (htonl(IN_CLASSA_NET));
648 else if (IN_CLASSB(i))
649 return (htonl(IN_CLASSB_NET));
650 return (htonl(IN_CLASSC_NET));
651 }
652
653 u_int
654 res_randomid(void) {
655 struct timeval now;
656
657 gettimeofday(&now, NULL);
658 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
659 }
660
661 /*%
662 * This routine is for closing the socket if a virtual circuit is used and
663 * the program wants to close it. This provides support for endhostent()
664 * which expects to close the socket.
665 *
666 * This routine is not expected to be user visible.
667 */
668 void
669 res_nclose(res_state statp) {
670 int ns;
671
672 if (statp->_vcsock >= 0) {
673 (void) close(statp->_vcsock);
674 statp->_vcsock = -1;
675 statp->_flags &= ~(RES_F_VC | RES_F_CONN);
676 }
677 for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
678 if (statp->_u._ext.nssocks[ns] != -1) {
679 (void) close(statp->_u._ext.nssocks[ns]);
680 statp->_u._ext.nssocks[ns] = -1;
681 }
682 }
683 }
684
685 void
686 res_ndestroy(res_state statp) {
687 res_nclose(statp);
688 if (statp->_u._ext.ext != NULL)
689 free(statp->_u._ext.ext);
690 statp->options &= ~RES_INIT;
691 statp->_u._ext.ext = NULL;
692 }
693
694 const char *
695 res_get_nibblesuffix(res_state statp) {
696 if (statp->_u._ext.ext)
697 return (statp->_u._ext.ext->nsuffix);
698 return ("ip6.arpa");
699 }
700
701 const char *
702 res_get_nibblesuffix2(res_state statp) {
703 if (statp->_u._ext.ext)
704 return (statp->_u._ext.ext->nsuffix2);
705 return ("ip6.int");
706 }
707
708 void
709 res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
710 int i, nserv;
711 size_t size;
712
713 /* close open servers */
714 res_nclose(statp);
715
716 /* cause rtt times to be forgotten */
717 statp->_u._ext.nscount = 0;
718
719 nserv = 0;
720 for (i = 0; i < cnt && nserv < MAXNS; i++) {
721 switch (set->sin.sin_family) {
722 case AF_INET:
723 size = sizeof(set->sin);
724 if (statp->_u._ext.ext)
725 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
726 &set->sin, size);
727 if (size <= sizeof(statp->nsaddr_list[nserv]))
728 memcpy(&statp->nsaddr_list[nserv],
729 &set->sin, size);
730 #ifdef notdef
731 else
732 statp->nsaddr_list[nserv].sin_family = 0;
733 #endif
734 nserv++;
735 break;
736
737 #ifdef HAS_INET6_STRUCTS
738 case AF_INET6:
739 size = sizeof(set->sin6);
740 if (statp->_u._ext.ext)
741 memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
742 &set->sin6, size);
743 if (size <= sizeof(statp->nsaddr_list[nserv]))
744 memcpy(&statp->nsaddr_list[nserv],
745 &set->sin6, size);
746 else
747 statp->nsaddr_list[nserv].sin_family = 0;
748 nserv++;
749 break;
750 #endif
751
752 default:
753 break;
754 }
755 set++;
756 }
757 statp->nscount = nserv;
758
759 }
760
761 int
762 res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
763 int i;
764 size_t size;
765 u_int16_t family;
766
767 for (i = 0; i < statp->nscount && i < cnt; i++) {
768 if (statp->_u._ext.ext)
769 family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
770 else
771 family = statp->nsaddr_list[i].sin_family;
772
773 switch (family) {
774 case AF_INET:
775 size = sizeof(set->sin);
776 if (statp->_u._ext.ext)
777 memcpy(&set->sin,
778 &statp->_u._ext.ext->nsaddrs[i],
779 size);
780 else
781 memcpy(&set->sin, &statp->nsaddr_list[i],
782 size);
783 break;
784
785 #ifdef HAS_INET6_STRUCTS
786 case AF_INET6:
787 size = sizeof(set->sin6);
788 if (statp->_u._ext.ext)
789 memcpy(&set->sin6,
790 &statp->_u._ext.ext->nsaddrs[i],
791 size);
792 else
793 memcpy(&set->sin6, &statp->nsaddr_list[i],
794 size);
795 break;
796 #endif
797
798 default:
799 set->sin.sin_family = 0;
800 break;
801 }
802 set++;
803 }
804 return (statp->nscount);
805 }
806
807 /*! \file */
808