Annotation of src/lib/libc/resolv/res_init.c, Revision 1.5
1.5 ! christos 1: /* $NetBSD: res_init.c,v 1.4 2004/05/21 15:35:05 christos Exp $ */
1.1 christos 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:
1.3 christos 73: #include <sys/cdefs.h>
1.1 christos 74: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 75: #ifdef notdef
1.1 christos 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";
1.3 christos 78: #else
1.5 ! christos 79: __RCSID("$NetBSD: res_init.c,v 1.4 2004/05/21 15:35:05 christos Exp $");
1.3 christos 80: #endif
1.1 christos 81: #endif /* LIBC_SCCS and not lint */
82:
83: #include "port_before.h"
84:
1.4 christos 85: #include "namespace.h"
1.1 christos 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:
1.5 ! christos 104: #if 0
1.4 christos 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
1.5 ! christos 115: #endif
1.4 christos 116:
117:
1.1 christos 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: #define RESOLVSORT
125: #define DEBUG
126:
127: static void res_setoptions __P((res_state, const char *, const char *));
128:
129: #ifdef RESOLVSORT
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: #endif
134:
135: #if !defined(isascii) /* XXX - could be a function */
136: # define isascii(c) (!(c & 0200))
137: #endif
138:
139: /*
140: * Resolver state default settings.
141: */
142:
143: /*
144: * Set up default settings. If the configuration file exist, the values
145: * there will have precedence. Otherwise, the server address is set to
146: * INADDR_ANY and the default domain name comes from the gethostname().
147: *
148: * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
149: * rather than INADDR_ANY ("0.0.0.0") as the default name server address
150: * since it was noted that INADDR_ANY actually meant ``the first interface
151: * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
152: * it had to be "up" in order for you to reach your own name server. It
153: * was later decided that since the recommended practice is to always
154: * install local static routes through 127.0.0.1 for all your network
155: * interfaces, that we could solve this problem without a code change.
156: *
157: * The configuration file should always be used, since it is the only way
158: * to specify a default domain. If you are running a server on your local
159: * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
160: * in the configuration file.
161: *
162: * Return 0 if completes successfully, -1 on error
163: */
164: int
165: res_ninit(res_state statp) {
166: extern int __res_vinit(res_state, int);
167:
168: return (__res_vinit(statp, 0));
169: }
170:
171: /* This function has to be reachable by res_data.c but not publically. */
172: int
173: __res_vinit(res_state statp, int preinit) {
174: register FILE *fp;
175: register char *cp, **pp;
176: register int n;
177: char buf[BUFSIZ];
178: int nserv = 0; /* number of nameserver records read from file */
179: int haveenv = 0;
180: int havesearch = 0;
181: #ifdef RESOLVSORT
182: int nsort = 0;
183: char *net;
184: #endif
185: int dots;
186: union res_sockaddr_union u[2];
187:
188: if (!preinit) {
189: statp->retrans = RES_TIMEOUT;
190: statp->retry = RES_DFLRETRY;
191: statp->options = RES_DEFAULT;
192: statp->id = res_randomid();
193: }
194:
195: if ((statp->options & RES_INIT) != 0U)
196: res_ndestroy(statp);
197:
198: memset(u, 0, sizeof(u));
199: #ifdef USELOOPBACK
200: u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
201: #else
202: u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
203: #endif
204: u[nserv].sin.sin_family = AF_INET;
205: u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
206: #ifdef HAVE_SA_LEN
207: u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
208: #endif
209: nserv++;
210: #ifdef HAS_INET6_STRUCTS
211: #ifdef USELOOPBACK
212: u[nserv].sin6.sin6_addr = in6addr_loopback;
213: #else
214: u[nserv].sin6.sin6_addr = in6addr_any;
215: #endif
216: u[nserv].sin6.sin6_family = AF_INET6;
217: u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
218: #ifdef HAVE_SA_LEN
219: u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
220: #endif
221: nserv++;
222: #endif
223: statp->nscount = 0;
224: statp->ndots = 1;
225: statp->pfcode = 0;
226: statp->_vcsock = -1;
227: statp->_flags = 0;
228: statp->qhook = NULL;
229: statp->rhook = NULL;
230: statp->_u._ext.nscount = 0;
231: statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
232: if (statp->_u._ext.ext != NULL) {
233: memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
234: statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
235: strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
236: strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
237: }
238: #ifdef RESOLVSORT
239: statp->nsort = 0;
240: #endif
241: res_setservers(statp, u, nserv);
242:
243: /* Allow user to override the local domain definition */
244: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
245: (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
246: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
247: haveenv++;
248:
249: /*
250: * Set search list to be blank-separated strings
251: * from rest of env value. Permits users of LOCALDOMAIN
252: * to still have a search list, and anyone to set the
253: * one that they want to use as an individual (even more
254: * important now that the rfc1535 stuff restricts searches)
255: */
256: cp = statp->defdname;
257: pp = statp->dnsrch;
258: *pp++ = cp;
259: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
260: if (*cp == '\n') /* silly backwards compat */
261: break;
262: else if (*cp == ' ' || *cp == '\t') {
263: *cp = 0;
264: n = 1;
265: } else if (n) {
266: *pp++ = cp;
267: n = 0;
268: havesearch = 1;
269: }
270: }
271: /* null terminate last domain if there are excess */
272: while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
273: cp++;
274: *cp = '\0';
275: *pp++ = 0;
276: }
277:
278: #define MATCH(line, name) \
279: (!strncmp(line, name, sizeof(name) - 1) && \
280: (line[sizeof(name) - 1] == ' ' || \
281: line[sizeof(name) - 1] == '\t'))
282:
283: nserv = 0;
284: if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
285: /* read the config file */
286: while (fgets(buf, sizeof(buf), fp) != NULL) {
287: /* skip comments */
288: if (*buf == ';' || *buf == '#')
289: continue;
290: /* read default domain name */
291: if (MATCH(buf, "domain")) {
292: if (haveenv) /* skip if have from environ */
293: continue;
294: cp = buf + sizeof("domain") - 1;
295: while (*cp == ' ' || *cp == '\t')
296: cp++;
297: if ((*cp == '\0') || (*cp == '\n'))
298: continue;
299: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
300: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
301: if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
302: *cp = '\0';
303: havesearch = 0;
304: continue;
305: }
306: /* set search list */
307: if (MATCH(buf, "search")) {
308: if (haveenv) /* skip if have from environ */
309: continue;
310: cp = buf + sizeof("search") - 1;
311: while (*cp == ' ' || *cp == '\t')
312: cp++;
313: if ((*cp == '\0') || (*cp == '\n'))
314: continue;
315: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
316: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
317: if ((cp = strchr(statp->defdname, '\n')) != NULL)
318: *cp = '\0';
319: /*
320: * Set search list to be blank-separated strings
321: * on rest of line.
322: */
323: cp = statp->defdname;
324: pp = statp->dnsrch;
325: *pp++ = cp;
326: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
327: if (*cp == ' ' || *cp == '\t') {
328: *cp = 0;
329: n = 1;
330: } else if (n) {
331: *pp++ = cp;
332: n = 0;
333: }
334: }
335: /* null terminate last domain if there are excess */
336: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
337: cp++;
338: *cp = '\0';
339: *pp++ = 0;
340: havesearch = 1;
341: continue;
342: }
343: /* read nameservers to query */
344: if (MATCH(buf, "nameserver") && nserv < MAXNS) {
345: struct addrinfo hints, *ai;
346: char sbuf[NI_MAXSERV];
347: const size_t minsiz =
348: sizeof(statp->_u._ext.ext->nsaddrs[0]);
349:
350: cp = buf + sizeof("nameserver") - 1;
351: while (*cp == ' ' || *cp == '\t')
352: cp++;
353: cp[strcspn(cp, ";# \t\n")] = '\0';
354: if ((*cp != '\0') && (*cp != '\n')) {
355: memset(&hints, 0, sizeof(hints));
356: hints.ai_family = PF_UNSPEC;
357: hints.ai_socktype = SOCK_DGRAM; /*dummy*/
358: hints.ai_flags = AI_NUMERICHOST;
359: sprintf(sbuf, "%u", NAMESERVER_PORT);
360: if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
361: ai->ai_addrlen <= minsiz) {
362: if (statp->_u._ext.ext != NULL) {
363: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
364: ai->ai_addr, ai->ai_addrlen);
365: }
366: if (ai->ai_addrlen <=
367: sizeof(statp->nsaddr_list[nserv])) {
368: memcpy(&statp->nsaddr_list[nserv],
369: ai->ai_addr, ai->ai_addrlen);
370: } else
371: statp->nsaddr_list[nserv].sin_family = 0;
372: freeaddrinfo(ai);
373: nserv++;
374: }
375: }
376: continue;
377: }
378: #ifdef RESOLVSORT
379: if (MATCH(buf, "sortlist")) {
380: struct in_addr a;
381:
382: cp = buf + sizeof("sortlist") - 1;
383: while (nsort < MAXRESOLVSORT) {
384: while (*cp == ' ' || *cp == '\t')
385: cp++;
386: if (*cp == '\0' || *cp == '\n' || *cp == ';')
387: break;
388: net = cp;
389: while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
390: isascii(*cp) && !isspace((unsigned char)*cp))
391: cp++;
392: n = *cp;
393: *cp = 0;
394: if (inet_aton(net, &a)) {
395: statp->sort_list[nsort].addr = a;
396: if (ISSORTMASK(n)) {
397: *cp++ = n;
398: net = cp;
399: while (*cp && *cp != ';' &&
400: isascii(*cp) &&
401: !isspace((unsigned char)*cp))
402: cp++;
403: n = *cp;
404: *cp = 0;
405: if (inet_aton(net, &a)) {
406: statp->sort_list[nsort].mask = a.s_addr;
407: } else {
408: statp->sort_list[nsort].mask =
409: net_mask(statp->sort_list[nsort].addr);
410: }
411: } else {
412: statp->sort_list[nsort].mask =
413: net_mask(statp->sort_list[nsort].addr);
414: }
415: nsort++;
416: }
417: *cp = n;
418: }
419: continue;
420: }
421: #endif
422: if (MATCH(buf, "options")) {
423: res_setoptions(statp, buf + sizeof("options") - 1, "conf");
424: continue;
425: }
426: }
427: if (nserv > 0)
428: statp->nscount = nserv;
429: #ifdef RESOLVSORT
430: statp->nsort = nsort;
431: #endif
432: (void) fclose(fp);
433: }
434: /*
435: * Last chance to get a nameserver. This should not normally
436: * be necessary
437: */
438: #ifdef NO_RESOLV_CONF
439: if(nserv == 0)
440: nserv = get_nameservers(statp);
441: #endif
442:
443: if (statp->defdname[0] == 0 &&
444: gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
445: (cp = strchr(buf, '.')) != NULL)
446: strcpy(statp->defdname, cp + 1);
447:
448: /* find components of local domain that might be searched */
449: if (havesearch == 0) {
450: pp = statp->dnsrch;
451: *pp++ = statp->defdname;
452: *pp = NULL;
453:
454: dots = 0;
455: for (cp = statp->defdname; *cp; cp++)
456: dots += (*cp == '.');
457:
458: cp = statp->defdname;
459: while (pp < statp->dnsrch + MAXDFLSRCH) {
460: if (dots < LOCALDOMAINPARTS)
461: break;
462: cp = strchr(cp, '.') + 1; /* we know there is one */
463: *pp++ = cp;
464: dots--;
465: }
466: *pp = NULL;
467: #ifdef DEBUG
468: if (statp->options & RES_DEBUG) {
469: printf(";; res_init()... default dnsrch list:\n");
470: for (pp = statp->dnsrch; *pp; pp++)
471: printf(";;\t%s\n", *pp);
472: printf(";;\t..END..\n");
473: }
474: #endif
475: }
476:
477: if ((cp = getenv("RES_OPTIONS")) != NULL)
478: res_setoptions(statp, cp, "env");
479: statp->options |= RES_INIT;
480: return (0);
481: }
482:
483: static void
484: res_setoptions(res_state statp, const char *options, const char *source)
485: {
486: const char *cp = options;
487: int i;
488: struct __res_state_ext *ext = statp->_u._ext.ext;
489:
490: #ifdef DEBUG
491: if (statp->options & RES_DEBUG)
492: printf(";; res_setoptions(\"%s\", \"%s\")...\n",
493: options, source);
494: #endif
495: while (*cp) {
496: /* skip leading and inner runs of spaces */
497: while (*cp == ' ' || *cp == '\t')
498: cp++;
499: /* search for and process individual options */
500: if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
501: i = atoi(cp + sizeof("ndots:") - 1);
502: if (i <= RES_MAXNDOTS)
503: statp->ndots = i;
504: else
505: statp->ndots = RES_MAXNDOTS;
506: #ifdef DEBUG
507: if (statp->options & RES_DEBUG)
508: printf(";;\tndots=%d\n", statp->ndots);
509: #endif
510: } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
511: i = atoi(cp + sizeof("timeout:") - 1);
512: if (i <= RES_MAXRETRANS)
513: statp->retrans = i;
514: else
515: statp->retrans = RES_MAXRETRANS;
516: #ifdef DEBUG
517: if (statp->options & RES_DEBUG)
518: printf(";;\ttimeout=%d\n", statp->retrans);
519: #endif
520: } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
521: i = atoi(cp + sizeof("attempts:") - 1);
522: if (i <= RES_MAXRETRY)
523: statp->retry = i;
524: else
525: statp->retry = RES_MAXRETRY;
526: #ifdef DEBUG
527: if (statp->options & RES_DEBUG)
528: printf(";;\tattempts=%d\n", statp->retry);
529: #endif
530: } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
531: #ifdef DEBUG
532: if (!(statp->options & RES_DEBUG)) {
533: printf(";; res_setoptions(\"%s\", \"%s\")..\n",
534: options, source);
535: statp->options |= RES_DEBUG;
536: }
537: printf(";;\tdebug\n");
538: #endif
539: } else if (!strncmp(cp, "no_tld_query",
540: sizeof("no_tld_query") - 1) ||
541: !strncmp(cp, "no-tld-query",
542: sizeof("no-tld-query") - 1)) {
543: statp->options |= RES_NOTLDQUERY;
544: } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
545: statp->options |= RES_USE_INET6;
546: } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
547: statp->options |= RES_ROTATE;
548: } else if (!strncmp(cp, "no-check-names",
549: sizeof("no-check-names") - 1)) {
550: statp->options |= RES_NOCHECKNAME;
551: }
552: #ifdef RES_USE_EDNS0
553: else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
554: statp->options |= RES_USE_EDNS0;
555: }
556: #endif
557: else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
558: statp->options |= RES_USE_DNAME;
559: }
560: else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
561: if (ext == NULL)
562: goto skip;
563: cp += sizeof("nibble:") - 1;
564: i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
1.2 christos 565: strncpy(ext->nsuffix, cp, (size_t)i);
1.1 christos 566: ext->nsuffix[i] = '\0';
567: }
568: else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
569: if (ext == NULL)
570: goto skip;
571: cp += sizeof("nibble2:") - 1;
572: i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
1.2 christos 573: strncpy(ext->nsuffix2, cp, (size_t)i);
1.1 christos 574: ext->nsuffix2[i] = '\0';
575: }
576: else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
577: cp += sizeof("v6revmode:") - 1;
578: /* "nibble" and "bitstring" used to be valid */
579: if (!strncmp(cp, "single", sizeof("single") - 1)) {
580: statp->options |= RES_NO_NIBBLE2;
581: } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
582: statp->options &=
583: ~RES_NO_NIBBLE2;
584: }
585: }
586: else {
587: /* XXX - print a warning here? */
588: }
589: skip:
590: /* skip to next run of spaces */
591: while (*cp && *cp != ' ' && *cp != '\t')
592: cp++;
593: }
594: }
595:
596: #ifdef RESOLVSORT
597: /* XXX - should really support CIDR which means explicit masks always. */
598: static u_int32_t
599: net_mask(in) /* XXX - should really use system's version of this */
600: struct in_addr in;
601: {
602: register u_int32_t i = ntohl(in.s_addr);
603:
604: if (IN_CLASSA(i))
605: return (htonl(IN_CLASSA_NET));
606: else if (IN_CLASSB(i))
607: return (htonl(IN_CLASSB_NET));
608: return (htonl(IN_CLASSC_NET));
609: }
610: #endif
611:
612: u_int
613: res_randomid(void) {
614: struct timeval now;
615:
616: gettimeofday(&now, NULL);
617: return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
618: }
619:
620: /*
621: * This routine is for closing the socket if a virtual circuit is used and
622: * the program wants to close it. This provides support for endhostent()
623: * which expects to close the socket.
624: *
625: * This routine is not expected to be user visible.
626: */
627: void
628: res_nclose(res_state statp) {
629: int ns;
630:
631: if (statp->_vcsock >= 0) {
632: (void) close(statp->_vcsock);
633: statp->_vcsock = -1;
634: statp->_flags &= ~(RES_F_VC | RES_F_CONN);
635: }
636: for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
637: if (statp->_u._ext.nssocks[ns] != -1) {
638: (void) close(statp->_u._ext.nssocks[ns]);
639: statp->_u._ext.nssocks[ns] = -1;
640: }
641: }
642: }
643:
644: void
645: res_ndestroy(res_state statp) {
646: res_nclose(statp);
647: if (statp->_u._ext.ext != NULL)
648: free(statp->_u._ext.ext);
649: statp->options &= ~RES_INIT;
650: statp->_u._ext.ext = NULL;
651: }
652:
653: const char *
654: res_get_nibblesuffix(res_state statp) {
655: if (statp->_u._ext.ext)
656: return (statp->_u._ext.ext->nsuffix);
657: return ("ip6.arpa");
658: }
659:
660: const char *
661: res_get_nibblesuffix2(res_state statp) {
662: if (statp->_u._ext.ext)
663: return (statp->_u._ext.ext->nsuffix2);
664: return ("ip6.int");
665: }
666:
667: void
668: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
669: int i, nserv;
670: size_t size;
671:
672: /* close open servers */
673: res_nclose(statp);
674:
675: /* cause rtt times to be forgotten */
676: statp->_u._ext.nscount = 0;
677:
678: nserv = 0;
679: for (i = 0; i < cnt && nserv < MAXNS; i++) {
680: switch (set->sin.sin_family) {
681: case AF_INET:
682: size = sizeof(set->sin);
683: if (statp->_u._ext.ext)
684: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
685: &set->sin, size);
686: if (size <= sizeof(statp->nsaddr_list[nserv]))
687: memcpy(&statp->nsaddr_list[nserv],
688: &set->sin, size);
689: else
690: statp->nsaddr_list[nserv].sin_family = 0;
691: nserv++;
692: break;
693:
694: #ifdef HAS_INET6_STRUCTS
695: case AF_INET6:
696: size = sizeof(set->sin6);
697: if (statp->_u._ext.ext)
698: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
699: &set->sin6, size);
700: if (size <= sizeof(statp->nsaddr_list[nserv]))
701: memcpy(&statp->nsaddr_list[nserv],
702: &set->sin6, size);
703: else
704: statp->nsaddr_list[nserv].sin_family = 0;
705: nserv++;
706: break;
707: #endif
708:
709: default:
710: break;
711: }
712: set++;
713: }
714: statp->nscount = nserv;
715:
716: }
717:
718: int
719: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
720: int i;
721: size_t size;
722: u_int16_t family;
723:
724: for (i = 0; i < statp->nscount && i < cnt; i++) {
725: if (statp->_u._ext.ext)
726: family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
727: else
728: family = statp->nsaddr_list[i].sin_family;
729:
730: switch (family) {
731: case AF_INET:
732: size = sizeof(set->sin);
733: if (statp->_u._ext.ext)
734: memcpy(&set->sin,
735: &statp->_u._ext.ext->nsaddrs[i],
736: size);
737: else
738: memcpy(&set->sin, &statp->nsaddr_list[i],
739: size);
740: break;
741:
742: #ifdef HAS_INET6_STRUCTS
743: case AF_INET6:
744: size = sizeof(set->sin6);
745: if (statp->_u._ext.ext)
746: memcpy(&set->sin6,
747: &statp->_u._ext.ext->nsaddrs[i],
748: size);
749: else
750: memcpy(&set->sin6, &statp->nsaddr_list[i],
751: size);
752: break;
753: #endif
754:
755: default:
756: set->sin.sin_family = 0;
757: break;
758: }
759: set++;
760: }
761: return (statp->nscount);
762: }
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