Annotation of src/lib/libc/resolv/res_init.c, Revision 1.18
1.18 ! christos 1: /* $NetBSD: res_init.c,v 1.17 2009/04/12 17:07:17 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";
1.17 christos 77: static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp";
1.3 christos 78: #else
1.18 ! christos 79: __RCSID("$NetBSD: res_init.c,v 1.17 2009/04/12 17:07:17 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:
1.17 christos 102: #define HAVE_MD5
103: #include <md5.h>
104:
105: #ifndef HAVE_MD5
106: # include "../dst/md5.h"
107: #else
108: # ifdef SOLARIS2
109: # include <sys/md5.h>
110: # endif
111: #endif
112: #ifndef _MD5_H_
113: # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
114: #endif
115:
1.1 christos 116: #include "port_after.h"
117:
1.5 christos 118: #if 0
1.4 christos 119: #ifdef __weak_alias
120: __weak_alias(res_ninit,_res_ninit)
121: __weak_alias(res_randomid,__res_randomid)
122: __weak_alias(res_nclose,_res_nclose)
123: __weak_alias(res_ndestroy,_res_ndestroy)
124: __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
125: __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
126: __weak_alias(res_getservers,__res_getservers)
127: __weak_alias(res_setservers,__res_setservers)
128: #endif
1.5 christos 129: #endif
1.4 christos 130:
131:
1.1 christos 132: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
133: #include <resolv.h>
134:
135: #include "res_private.h"
136:
1.15 christos 137: #define RESOLVSORT
1.9 christos 138: /*% Options. Should all be left alone. */
1.7 christos 139: #ifndef DEBUG
1.1 christos 140: #define DEBUG
1.7 christos 141: #endif
1.1 christos 142:
1.9 christos 143: #ifdef SOLARIS2
144: #include <sys/systeminfo.h>
145: #endif
146:
1.1 christos 147: static void res_setoptions __P((res_state, const char *, const char *));
148:
1.14 christos 149: #ifdef RESOLVSORT
1.1 christos 150: static const char sort_mask[] = "/&";
151: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
152: static u_int32_t net_mask __P((struct in_addr));
1.14 christos 153: #endif
1.1 christos 154:
1.9 christos 155: #if !defined(isascii) /*%< XXX - could be a function */
1.1 christos 156: # define isascii(c) (!(c & 0200))
157: #endif
158:
159: /*
160: * Resolver state default settings.
161: */
162:
1.9 christos 163: /*%
1.1 christos 164: * Set up default settings. If the configuration file exist, the values
165: * there will have precedence. Otherwise, the server address is set to
166: * INADDR_ANY and the default domain name comes from the gethostname().
167: *
168: * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
169: * rather than INADDR_ANY ("0.0.0.0") as the default name server address
170: * since it was noted that INADDR_ANY actually meant ``the first interface
171: * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
172: * it had to be "up" in order for you to reach your own name server. It
173: * was later decided that since the recommended practice is to always
174: * install local static routes through 127.0.0.1 for all your network
175: * interfaces, that we could solve this problem without a code change.
176: *
177: * The configuration file should always be used, since it is the only way
178: * to specify a default domain. If you are running a server on your local
179: * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
180: * in the configuration file.
181: *
182: * Return 0 if completes successfully, -1 on error
183: */
184: int
185: res_ninit(res_state statp) {
186: extern int __res_vinit(res_state, int);
187:
188: return (__res_vinit(statp, 0));
189: }
190:
1.9 christos 191: /*% This function has to be reachable by res_data.c but not publically. */
1.1 christos 192: int
193: __res_vinit(res_state statp, int preinit) {
194: register FILE *fp;
195: register char *cp, **pp;
196: register int n;
197: char buf[BUFSIZ];
1.9 christos 198: int nserv = 0; /*%< number of nameserver records read from file */
1.1 christos 199: int haveenv = 0;
200: int havesearch = 0;
1.14 christos 201: #ifdef RESOLVSORT
1.1 christos 202: int nsort = 0;
203: char *net;
1.14 christos 204: #endif
1.1 christos 205: int dots;
206: union res_sockaddr_union u[2];
1.14 christos 207: int maxns = MAXNS;
208:
209: RES_SET_H_ERRNO(statp, 0);
1.17 christos 210: if (statp->_u._ext.ext != NULL)
211: res_ndestroy(statp);
1.14 christos 212:
1.1 christos 213: if (!preinit) {
214: statp->retrans = RES_TIMEOUT;
215: statp->retry = RES_DFLRETRY;
216: statp->options = RES_DEFAULT;
1.17 christos 217: res_rndinit(statp);
218: statp->id = res_nrandomid(statp);
1.1 christos 219: }
220:
1.12 christos 221: if ((statp->options & RES_INIT) != 0U)
222: res_ndestroy(statp);
223:
1.1 christos 224: memset(u, 0, sizeof(u));
225: #ifdef USELOOPBACK
226: u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
227: #else
228: u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
229: #endif
230: u[nserv].sin.sin_family = AF_INET;
231: u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
232: #ifdef HAVE_SA_LEN
233: u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
234: #endif
235: nserv++;
236: #ifdef HAS_INET6_STRUCTS
237: #ifdef USELOOPBACK
238: u[nserv].sin6.sin6_addr = in6addr_loopback;
239: #else
240: u[nserv].sin6.sin6_addr = in6addr_any;
241: #endif
242: u[nserv].sin6.sin6_family = AF_INET6;
243: u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
244: #ifdef HAVE_SA_LEN
245: u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
246: #endif
247: nserv++;
248: #endif
249: statp->nscount = 0;
250: statp->ndots = 1;
251: statp->pfcode = 0;
252: statp->_vcsock = -1;
253: statp->_flags = 0;
254: statp->qhook = NULL;
255: statp->rhook = NULL;
256: statp->_u._ext.nscount = 0;
257: statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
258: if (statp->_u._ext.ext != NULL) {
259: memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
260: statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
261: strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
262: strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14 christos 263: } else {
264: /*
265: * Historically res_init() rarely, if at all, failed.
266: * Examples and applications exist which do not check
267: * our return code. Furthermore several applications
268: * simply call us to get the systems domainname. So
269: * rather then immediately fail here we store the
270: * failure, which is returned later, in h_errno. And
271: * prevent the collection of 'nameserver' information
272: * by setting maxns to 0. Thus applications that fail
273: * to check our return code wont be able to make
274: * queries anyhow.
275: */
276: RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
277: maxns = 0;
278: }
279: #ifdef RESOLVSORT
1.1 christos 280: statp->nsort = 0;
1.14 christos 281: #endif
1.1 christos 282: res_setservers(statp, u, nserv);
283:
1.9 christos 284: #ifdef SOLARIS2
285: /*
286: * The old libresolv derived the defaultdomain from NIS/NIS+.
287: * We want to keep this behaviour
288: */
289: {
290: char buf[sizeof(statp->defdname)], *cp;
291: int ret;
292:
293: if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
294: (unsigned int)ret <= sizeof(buf)) {
295: if (buf[0] == '+')
296: buf[0] = '.';
297: cp = strchr(buf, '.');
298: cp = (cp == NULL) ? buf : (cp + 1);
1.14 christos 299: (void)strlcpy(statp->defdname, cp,
300: sizeof(statp->defdname));
1.9 christos 301: }
302: }
303: #endif /* SOLARIS2 */
304:
1.1 christos 305: /* Allow user to override the local domain definition */
306: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
307: (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
308: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
309: haveenv++;
310:
311: /*
312: * Set search list to be blank-separated strings
313: * from rest of env value. Permits users of LOCALDOMAIN
314: * to still have a search list, and anyone to set the
315: * one that they want to use as an individual (even more
316: * important now that the rfc1535 stuff restricts searches)
317: */
318: cp = statp->defdname;
319: pp = statp->dnsrch;
320: *pp++ = cp;
321: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9 christos 322: if (*cp == '\n') /*%< silly backwards compat */
1.1 christos 323: break;
324: else if (*cp == ' ' || *cp == '\t') {
325: *cp = 0;
326: n = 1;
327: } else if (n) {
328: *pp++ = cp;
329: n = 0;
330: havesearch = 1;
331: }
332: }
333: /* null terminate last domain if there are excess */
334: while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
335: cp++;
336: *cp = '\0';
337: *pp++ = 0;
338: }
339:
340: #define MATCH(line, name) \
341: (!strncmp(line, name, sizeof(name) - 1) && \
342: (line[sizeof(name) - 1] == ' ' || \
343: line[sizeof(name) - 1] == '\t'))
344:
345: nserv = 0;
346: if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
347: /* read the config file */
348: while (fgets(buf, sizeof(buf), fp) != NULL) {
349: /* skip comments */
350: if (*buf == ';' || *buf == '#')
351: continue;
352: /* read default domain name */
353: if (MATCH(buf, "domain")) {
1.9 christos 354: if (haveenv) /*%< skip if have from environ */
1.1 christos 355: continue;
356: cp = buf + sizeof("domain") - 1;
357: while (*cp == ' ' || *cp == '\t')
358: cp++;
359: if ((*cp == '\0') || (*cp == '\n'))
360: continue;
361: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
362: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
363: if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
364: *cp = '\0';
365: havesearch = 0;
366: continue;
367: }
368: /* set search list */
369: if (MATCH(buf, "search")) {
1.9 christos 370: if (haveenv) /*%< skip if have from environ */
1.1 christos 371: continue;
372: cp = buf + sizeof("search") - 1;
373: while (*cp == ' ' || *cp == '\t')
374: cp++;
375: if ((*cp == '\0') || (*cp == '\n'))
376: continue;
377: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
378: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
379: if ((cp = strchr(statp->defdname, '\n')) != NULL)
380: *cp = '\0';
381: /*
382: * Set search list to be blank-separated strings
383: * on rest of line.
384: */
385: cp = statp->defdname;
386: pp = statp->dnsrch;
387: *pp++ = cp;
388: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
389: if (*cp == ' ' || *cp == '\t') {
390: *cp = 0;
391: n = 1;
392: } else if (n) {
393: *pp++ = cp;
394: n = 0;
395: }
396: }
397: /* null terminate last domain if there are excess */
398: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
399: cp++;
400: *cp = '\0';
401: *pp++ = 0;
402: havesearch = 1;
403: continue;
404: }
405: /* read nameservers to query */
1.14 christos 406: if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1 christos 407: struct addrinfo hints, *ai;
408: char sbuf[NI_MAXSERV];
409: const size_t minsiz =
410: sizeof(statp->_u._ext.ext->nsaddrs[0]);
411:
412: cp = buf + sizeof("nameserver") - 1;
413: while (*cp == ' ' || *cp == '\t')
414: cp++;
415: cp[strcspn(cp, ";# \t\n")] = '\0';
416: if ((*cp != '\0') && (*cp != '\n')) {
417: memset(&hints, 0, sizeof(hints));
418: hints.ai_family = PF_UNSPEC;
419: hints.ai_socktype = SOCK_DGRAM; /*dummy*/
420: hints.ai_flags = AI_NUMERICHOST;
421: sprintf(sbuf, "%u", NAMESERVER_PORT);
422: if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
423: ai->ai_addrlen <= minsiz) {
424: if (statp->_u._ext.ext != NULL) {
425: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
426: ai->ai_addr, ai->ai_addrlen);
427: }
428: if (ai->ai_addrlen <=
429: sizeof(statp->nsaddr_list[nserv])) {
430: memcpy(&statp->nsaddr_list[nserv],
431: ai->ai_addr, ai->ai_addrlen);
432: } else
433: statp->nsaddr_list[nserv].sin_family = 0;
434: freeaddrinfo(ai);
435: nserv++;
436: }
437: }
438: continue;
439: }
1.14 christos 440: #ifdef RESOLVSORT
1.1 christos 441: if (MATCH(buf, "sortlist")) {
442: struct in_addr a;
443:
444: cp = buf + sizeof("sortlist") - 1;
445: while (nsort < MAXRESOLVSORT) {
446: while (*cp == ' ' || *cp == '\t')
447: cp++;
448: if (*cp == '\0' || *cp == '\n' || *cp == ';')
449: break;
450: net = cp;
451: while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
452: isascii(*cp) && !isspace((unsigned char)*cp))
453: cp++;
454: n = *cp;
455: *cp = 0;
456: if (inet_aton(net, &a)) {
457: statp->sort_list[nsort].addr = a;
458: if (ISSORTMASK(n)) {
459: *cp++ = n;
460: net = cp;
461: while (*cp && *cp != ';' &&
462: isascii(*cp) &&
463: !isspace((unsigned char)*cp))
464: cp++;
465: n = *cp;
466: *cp = 0;
467: if (inet_aton(net, &a)) {
468: statp->sort_list[nsort].mask = a.s_addr;
469: } else {
470: statp->sort_list[nsort].mask =
471: net_mask(statp->sort_list[nsort].addr);
472: }
473: } else {
474: statp->sort_list[nsort].mask =
475: net_mask(statp->sort_list[nsort].addr);
476: }
477: nsort++;
478: }
479: *cp = n;
480: }
481: continue;
482: }
1.14 christos 483: #endif
1.1 christos 484: if (MATCH(buf, "options")) {
485: res_setoptions(statp, buf + sizeof("options") - 1, "conf");
486: continue;
487: }
488: }
489: if (nserv > 0)
490: statp->nscount = nserv;
1.14 christos 491: #ifdef RESOLVSORT
1.1 christos 492: statp->nsort = nsort;
1.14 christos 493: #endif
1.1 christos 494: (void) fclose(fp);
495: }
496: /*
497: * Last chance to get a nameserver. This should not normally
498: * be necessary
499: */
500: #ifdef NO_RESOLV_CONF
501: if(nserv == 0)
502: nserv = get_nameservers(statp);
503: #endif
504:
505: if (statp->defdname[0] == 0 &&
506: gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
507: (cp = strchr(buf, '.')) != NULL)
508: strcpy(statp->defdname, cp + 1);
509:
510: /* find components of local domain that might be searched */
511: if (havesearch == 0) {
512: pp = statp->dnsrch;
513: *pp++ = statp->defdname;
514: *pp = NULL;
515:
516: dots = 0;
517: for (cp = statp->defdname; *cp; cp++)
518: dots += (*cp == '.');
519:
520: cp = statp->defdname;
521: while (pp < statp->dnsrch + MAXDFLSRCH) {
522: if (dots < LOCALDOMAINPARTS)
523: break;
1.9 christos 524: cp = strchr(cp, '.') + 1; /*%< we know there is one */
1.1 christos 525: *pp++ = cp;
526: dots--;
527: }
528: *pp = NULL;
529: #ifdef DEBUG
530: if (statp->options & RES_DEBUG) {
531: printf(";; res_init()... default dnsrch list:\n");
532: for (pp = statp->dnsrch; *pp; pp++)
533: printf(";;\t%s\n", *pp);
534: printf(";;\t..END..\n");
535: }
536: #endif
537: }
538:
539: if ((cp = getenv("RES_OPTIONS")) != NULL)
540: res_setoptions(statp, cp, "env");
541: statp->options |= RES_INIT;
1.14 christos 542: return (statp->res_h_errno);
1.1 christos 543: }
544:
545: static void
546: res_setoptions(res_state statp, const char *options, const char *source)
547: {
548: const char *cp = options;
549: int i;
550: struct __res_state_ext *ext = statp->_u._ext.ext;
551:
552: #ifdef DEBUG
553: if (statp->options & RES_DEBUG)
554: printf(";; res_setoptions(\"%s\", \"%s\")...\n",
555: options, source);
556: #endif
557: while (*cp) {
558: /* skip leading and inner runs of spaces */
559: while (*cp == ' ' || *cp == '\t')
560: cp++;
561: /* search for and process individual options */
562: if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
563: i = atoi(cp + sizeof("ndots:") - 1);
564: if (i <= RES_MAXNDOTS)
565: statp->ndots = i;
566: else
567: statp->ndots = RES_MAXNDOTS;
568: #ifdef DEBUG
569: if (statp->options & RES_DEBUG)
570: printf(";;\tndots=%d\n", statp->ndots);
571: #endif
572: } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
573: i = atoi(cp + sizeof("timeout:") - 1);
574: if (i <= RES_MAXRETRANS)
575: statp->retrans = i;
576: else
577: statp->retrans = RES_MAXRETRANS;
578: #ifdef DEBUG
579: if (statp->options & RES_DEBUG)
580: printf(";;\ttimeout=%d\n", statp->retrans);
581: #endif
1.9 christos 582: #ifdef SOLARIS2
583: } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
584: /*
585: * For backward compatibility, 'retrans' is
586: * supported as an alias for 'timeout', though
587: * without an imposed maximum.
588: */
589: statp->retrans = atoi(cp + sizeof("retrans:") - 1);
590: } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
591: /*
592: * For backward compatibility, 'retry' is
593: * supported as an alias for 'attempts', though
594: * without an imposed maximum.
595: */
596: statp->retry = atoi(cp + sizeof("retry:") - 1);
597: #endif /* SOLARIS2 */
1.1 christos 598: } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
599: i = atoi(cp + sizeof("attempts:") - 1);
600: if (i <= RES_MAXRETRY)
601: statp->retry = i;
602: else
603: statp->retry = RES_MAXRETRY;
604: #ifdef DEBUG
605: if (statp->options & RES_DEBUG)
606: printf(";;\tattempts=%d\n", statp->retry);
607: #endif
608: } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
609: #ifdef DEBUG
610: if (!(statp->options & RES_DEBUG)) {
611: printf(";; res_setoptions(\"%s\", \"%s\")..\n",
612: options, source);
613: statp->options |= RES_DEBUG;
614: }
615: printf(";;\tdebug\n");
616: #endif
617: } else if (!strncmp(cp, "no_tld_query",
618: sizeof("no_tld_query") - 1) ||
619: !strncmp(cp, "no-tld-query",
620: sizeof("no-tld-query") - 1)) {
621: statp->options |= RES_NOTLDQUERY;
622: } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
623: statp->options |= RES_USE_INET6;
624: } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
625: statp->options |= RES_ROTATE;
626: } else if (!strncmp(cp, "no-check-names",
627: sizeof("no-check-names") - 1)) {
628: statp->options |= RES_NOCHECKNAME;
629: }
630: #ifdef RES_USE_EDNS0
631: else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
632: statp->options |= RES_USE_EDNS0;
633: }
634: #endif
635: else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
636: statp->options |= RES_USE_DNAME;
637: }
638: else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
639: if (ext == NULL)
640: goto skip;
641: cp += sizeof("nibble:") - 1;
642: i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
1.2 christos 643: strncpy(ext->nsuffix, cp, (size_t)i);
1.1 christos 644: ext->nsuffix[i] = '\0';
645: }
646: else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
647: if (ext == NULL)
648: goto skip;
649: cp += sizeof("nibble2:") - 1;
650: i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
1.2 christos 651: strncpy(ext->nsuffix2, cp, (size_t)i);
1.1 christos 652: ext->nsuffix2[i] = '\0';
653: }
654: else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
655: cp += sizeof("v6revmode:") - 1;
656: /* "nibble" and "bitstring" used to be valid */
657: if (!strncmp(cp, "single", sizeof("single") - 1)) {
658: statp->options |= RES_NO_NIBBLE2;
659: } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
660: statp->options &=
661: ~RES_NO_NIBBLE2;
662: }
663: }
664: else {
665: /* XXX - print a warning here? */
666: }
667: skip:
668: /* skip to next run of spaces */
669: while (*cp && *cp != ' ' && *cp != '\t')
670: cp++;
671: }
672: }
673:
1.14 christos 674: #ifdef RESOLVSORT
1.1 christos 675: /* XXX - should really support CIDR which means explicit masks always. */
676: static u_int32_t
1.9 christos 677: net_mask(in) /*!< XXX - should really use system's version of this */
1.1 christos 678: struct in_addr in;
679: {
680: register u_int32_t i = ntohl(in.s_addr);
681:
682: if (IN_CLASSA(i))
683: return (htonl(IN_CLASSA_NET));
684: else if (IN_CLASSB(i))
685: return (htonl(IN_CLASSB_NET));
686: return (htonl(IN_CLASSC_NET));
687: }
1.14 christos 688: #endif
1.1 christos 689:
1.17 christos 690: void
691: res_rndinit(res_state statp)
692: {
693: struct timeval now;
694: u_int32_t u32;
695: u_int16_t u16;
696:
697: gettimeofday(&now, NULL);
1.18 ! christos 698: u32 = (u_int32_t)now.tv_sec;
1.17 christos 699: memcpy(statp->_rnd, &u32, 4);
700: u32 = now.tv_usec;
701: memcpy(statp->_rnd + 4, &u32, 4);
1.18 ! christos 702: u32 += (u_int32_t)now.tv_sec;
1.17 christos 703: memcpy(statp->_rnd + 8, &u32, 4);
704: u16 = getpid();
705: memcpy(statp->_rnd + 12, &u16, 2);
706: }
707:
1.1 christos 708: u_int
1.17 christos 709: res_nrandomid(res_state statp) {
1.1 christos 710: struct timeval now;
1.17 christos 711: u_int16_t u16;
712: MD5_CTX ctx;
1.1 christos 713:
714: gettimeofday(&now, NULL);
1.17 christos 715: u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
716: memcpy(statp->_rnd + 14, &u16, 2);
717: #ifndef HAVE_MD5
718: MD5_Init(&ctx);
719: MD5_Update(&ctx, statp->_rnd, 16);
720: MD5_Final(statp->_rnd, &ctx);
721: #else
722: MD5Init(&ctx);
723: MD5Update(&ctx, statp->_rnd, 16);
724: MD5Final(statp->_rnd, &ctx);
725: #endif
726: memcpy(&u16, statp->_rnd + 14, 2);
727: return ((u_int) u16);
1.1 christos 728: }
729:
1.9 christos 730: /*%
1.1 christos 731: * This routine is for closing the socket if a virtual circuit is used and
732: * the program wants to close it. This provides support for endhostent()
733: * which expects to close the socket.
734: *
735: * This routine is not expected to be user visible.
736: */
737: void
738: res_nclose(res_state statp) {
739: int ns;
740:
741: if (statp->_vcsock >= 0) {
742: (void) close(statp->_vcsock);
743: statp->_vcsock = -1;
744: statp->_flags &= ~(RES_F_VC | RES_F_CONN);
745: }
746: for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
747: if (statp->_u._ext.nssocks[ns] != -1) {
748: (void) close(statp->_u._ext.nssocks[ns]);
749: statp->_u._ext.nssocks[ns] = -1;
750: }
751: }
752: }
753:
754: void
755: res_ndestroy(res_state statp) {
756: res_nclose(statp);
757: if (statp->_u._ext.ext != NULL)
758: free(statp->_u._ext.ext);
759: statp->options &= ~RES_INIT;
760: statp->_u._ext.ext = NULL;
761: }
762:
763: const char *
764: res_get_nibblesuffix(res_state statp) {
765: if (statp->_u._ext.ext)
766: return (statp->_u._ext.ext->nsuffix);
767: return ("ip6.arpa");
768: }
769:
770: const char *
771: res_get_nibblesuffix2(res_state statp) {
772: if (statp->_u._ext.ext)
773: return (statp->_u._ext.ext->nsuffix2);
774: return ("ip6.int");
775: }
776:
777: void
778: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
779: int i, nserv;
780: size_t size;
781:
782: /* close open servers */
783: res_nclose(statp);
784:
785: /* cause rtt times to be forgotten */
786: statp->_u._ext.nscount = 0;
787:
788: nserv = 0;
789: for (i = 0; i < cnt && nserv < MAXNS; i++) {
790: switch (set->sin.sin_family) {
791: case AF_INET:
792: size = sizeof(set->sin);
793: if (statp->_u._ext.ext)
794: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
795: &set->sin, size);
796: if (size <= sizeof(statp->nsaddr_list[nserv]))
797: memcpy(&statp->nsaddr_list[nserv],
798: &set->sin, size);
799: else
800: statp->nsaddr_list[nserv].sin_family = 0;
801: nserv++;
802: break;
803:
804: #ifdef HAS_INET6_STRUCTS
805: case AF_INET6:
806: size = sizeof(set->sin6);
807: if (statp->_u._ext.ext)
808: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
809: &set->sin6, size);
810: if (size <= sizeof(statp->nsaddr_list[nserv]))
811: memcpy(&statp->nsaddr_list[nserv],
812: &set->sin6, size);
813: else
814: statp->nsaddr_list[nserv].sin_family = 0;
815: nserv++;
816: break;
817: #endif
818:
819: default:
820: break;
821: }
822: set++;
823: }
824: statp->nscount = nserv;
825:
826: }
827:
828: int
829: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
830: int i;
831: size_t size;
832: u_int16_t family;
833:
834: for (i = 0; i < statp->nscount && i < cnt; i++) {
835: if (statp->_u._ext.ext)
836: family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
837: else
838: family = statp->nsaddr_list[i].sin_family;
839:
840: switch (family) {
841: case AF_INET:
842: size = sizeof(set->sin);
843: if (statp->_u._ext.ext)
844: memcpy(&set->sin,
845: &statp->_u._ext.ext->nsaddrs[i],
846: size);
847: else
848: memcpy(&set->sin, &statp->nsaddr_list[i],
849: size);
850: break;
851:
852: #ifdef HAS_INET6_STRUCTS
853: case AF_INET6:
854: size = sizeof(set->sin6);
855: if (statp->_u._ext.ext)
856: memcpy(&set->sin6,
857: &statp->_u._ext.ext->nsaddrs[i],
858: size);
859: else
860: memcpy(&set->sin6, &statp->nsaddr_list[i],
861: size);
862: break;
863: #endif
864:
865: default:
866: set->sin.sin_family = 0;
867: break;
868: }
869: set++;
870: }
871: return (statp->nscount);
872: }
1.9 christos 873:
874: /*! \file */
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