Annotation of src/lib/libc/resolv/res_init.c, Revision 1.13
1.13 ! ghen 1: /* $NetBSD: res_init.c,v 1.1.1.3 2007/03/30 20:16:22 ghen 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";
1.9 christos 77: static const char rcsid[] = "Id: res_init.c,v 1.16.18.5 2006/08/30 23:23:13 marka Exp";
1.3 christos 78: #else
1.13 ! ghen 79: __RCSID("$NetBSD: res_init.c,v 1.12 2007/02/09 22:29:40 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:
1.9 christos 123: /*% Options. Should all be left alone. */
1.7 christos 124: #ifndef DEBUG
1.1 christos 125: #define DEBUG
1.7 christos 126: #endif
1.1 christos 127:
1.9 christos 128: #ifdef SOLARIS2
129: #include <sys/systeminfo.h>
130: #endif
131:
1.1 christos 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:
1.9 christos 138: #if !defined(isascii) /*%< XXX - could be a function */
1.1 christos 139: # define isascii(c) (!(c & 0200))
140: #endif
141:
142: /*
143: * Resolver state default settings.
144: */
145:
1.9 christos 146: /*%
1.1 christos 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:
1.9 christos 174: /*% This function has to be reachable by res_data.c but not publically. */
1.1 christos 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];
1.9 christos 181: int nserv = 0; /*%< number of nameserver records read from file */
1.1 christos 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:
1.12 christos 196: if ((statp->options & RES_INIT) != 0U)
197: res_ndestroy(statp);
198:
1.1 christos 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");
1.9 christos 238: } else
239: return (-1);
1.1 christos 240: statp->nsort = 0;
241: res_setservers(statp, u, nserv);
242:
1.9 christos 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:
1.1 christos 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++) {
1.9 christos 282: if (*cp == '\n') /*%< silly backwards compat */
1.1 christos 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")) {
1.9 christos 314: if (haveenv) /*%< skip if have from environ */
1.1 christos 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")) {
1.9 christos 330: if (haveenv) /*%< skip if have from environ */
1.1 christos 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;
1.9 christos 480: cp = strchr(cp, '.') + 1; /*%< we know there is one */
1.1 christos 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);
1.9 christos 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
1.1 christos 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
1.9 christos 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 */
1.1 christos 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);
1.2 christos 608: strncpy(ext->nsuffix, cp, (size_t)i);
1.1 christos 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);
1.2 christos 616: strncpy(ext->nsuffix2, cp, (size_t)i);
1.1 christos 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
1.9 christos 641: net_mask(in) /*!< XXX - should really use system's version of this */
1.1 christos 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:
1.9 christos 661: /*%
1.1 christos 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);
1.8 christos 730: #ifdef notdef
1.1 christos 731: else
732: statp->nsaddr_list[nserv].sin_family = 0;
1.8 christos 733: #endif
1.1 christos 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: }
1.9 christos 806:
807: /*! \file */
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