Annotation of src/lib/libc/resolv/res_init.c, Revision 1.30
1.30 ! christos 1: /* $NetBSD: res_init.c,v 1.29 2014/09/16 01:29:48 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.
1.30 ! christos 15: * 3. Neither the name of the University nor the names of its contributors
1.1 christos 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: /*
33: * Portions Copyright (c) 1993 by Digital Equipment Corporation.
34: *
35: * Permission to use, copy, modify, and distribute this software for any
36: * purpose with or without fee is hereby granted, provided that the above
37: * copyright notice and this permission notice appear in all copies, and that
38: * the name of Digital Equipment Corporation not be used in advertising or
39: * publicity pertaining to distribution of the document or software without
40: * specific, written prior permission.
41: *
42: * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
43: * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
44: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
45: * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
46: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
47: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
48: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
49: * SOFTWARE.
50: */
51:
52: /*
53: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
54: * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
55: *
56: * Permission to use, copy, modify, and distribute this software for any
57: * purpose with or without fee is hereby granted, provided that the above
58: * copyright notice and this permission notice appear in all copies.
59: *
60: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
61: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
62: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
63: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
64: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
65: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
66: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
67: */
68:
1.3 christos 69: #include <sys/cdefs.h>
1.1 christos 70: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 71: #ifdef notdef
1.1 christos 72: static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
1.17 christos 73: static const char rcsid[] = "Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp";
1.3 christos 74: #else
1.30 ! christos 75: __RCSID("$NetBSD: res_init.c,v 1.29 2014/09/16 01:29:48 christos Exp $");
1.3 christos 76: #endif
1.1 christos 77: #endif /* LIBC_SCCS and not lint */
78:
79: #include "port_before.h"
80:
1.4 christos 81: #include "namespace.h"
1.1 christos 82: #include <sys/types.h>
83: #include <sys/param.h>
84: #include <sys/socket.h>
1.21 christos 85: #include <sys/stat.h>
1.1 christos 86: #include <sys/time.h>
1.21 christos 87: #include <sys/event.h>
1.1 christos 88:
89: #include <netinet/in.h>
90: #include <arpa/inet.h>
91: #include <arpa/nameser.h>
92:
93: #include <ctype.h>
94: #include <stdio.h>
95: #include <stdlib.h>
96: #include <string.h>
97: #include <unistd.h>
1.21 christos 98: #include <fcntl.h>
1.1 christos 99: #include <netdb.h>
100:
1.17 christos 101: #define HAVE_MD5
102: #include <md5.h>
103:
104: #ifndef HAVE_MD5
105: # include "../dst/md5.h"
106: #else
107: # ifdef SOLARIS2
108: # include <sys/md5.h>
109: # endif
110: #endif
111: #ifndef _MD5_H_
112: # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
113: #endif
114:
1.1 christos 115: #include "port_after.h"
116:
1.5 christos 117: #if 0
1.4 christos 118: #ifdef __weak_alias
119: __weak_alias(res_ninit,_res_ninit)
120: __weak_alias(res_randomid,__res_randomid)
121: __weak_alias(res_nclose,_res_nclose)
122: __weak_alias(res_ndestroy,_res_ndestroy)
123: __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
124: __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
125: __weak_alias(res_getservers,__res_getservers)
126: __weak_alias(res_setservers,__res_setservers)
127: #endif
1.5 christos 128: #endif
1.4 christos 129:
130:
1.1 christos 131: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
132: #include <resolv.h>
133:
134: #include "res_private.h"
135:
1.15 christos 136: #define RESOLVSORT
1.9 christos 137: /*% Options. Should all be left alone. */
1.7 christos 138: #ifndef DEBUG
1.1 christos 139: #define DEBUG
1.7 christos 140: #endif
1.1 christos 141:
1.9 christos 142: #ifdef SOLARIS2
143: #include <sys/systeminfo.h>
144: #endif
145:
1.25 matt 146: static void res_setoptions(res_state, const char *, const char *);
1.1 christos 147:
1.14 christos 148: #ifdef RESOLVSORT
1.1 christos 149: static const char sort_mask[] = "/&";
150: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
1.25 matt 151: static uint32_t net_mask(struct in_addr);
1.14 christos 152: #endif
1.1 christos 153:
1.9 christos 154: #if !defined(isascii) /*%< XXX - could be a function */
1.1 christos 155: # define isascii(c) (!(c & 0200))
156: #endif
157:
1.21 christos 158: static struct timespec __res_conf_time;
159: static const struct timespec ts = { 0, 0 };
160:
1.28 christos 161: const char *__res_conf_name = _PATH_RESCONF;
162:
1.1 christos 163: /*
164: * Resolver state default settings.
165: */
166:
1.9 christos 167: /*%
1.1 christos 168: * Set up default settings. If the configuration file exist, the values
169: * there will have precedence. Otherwise, the server address is set to
170: * INADDR_ANY and the default domain name comes from the gethostname().
171: *
172: * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
173: * rather than INADDR_ANY ("0.0.0.0") as the default name server address
174: * since it was noted that INADDR_ANY actually meant ``the first interface
175: * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
176: * it had to be "up" in order for you to reach your own name server. It
177: * was later decided that since the recommended practice is to always
178: * install local static routes through 127.0.0.1 for all your network
179: * interfaces, that we could solve this problem without a code change.
180: *
181: * The configuration file should always be used, since it is the only way
182: * to specify a default domain. If you are running a server on your local
183: * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
184: * in the configuration file.
185: *
186: * Return 0 if completes successfully, -1 on error
187: */
188: int
189: res_ninit(res_state statp) {
190: return (__res_vinit(statp, 0));
191: }
192:
1.9 christos 193: /*% This function has to be reachable by res_data.c but not publically. */
1.1 christos 194: int
195: __res_vinit(res_state statp, int preinit) {
196: register FILE *fp;
197: register char *cp, **pp;
198: register int n;
199: char buf[BUFSIZ];
1.9 christos 200: int nserv = 0; /*%< number of nameserver records read from file */
1.1 christos 201: int haveenv = 0;
202: int havesearch = 0;
1.14 christos 203: #ifdef RESOLVSORT
1.1 christos 204: int nsort = 0;
205: char *net;
1.14 christos 206: #endif
1.1 christos 207: int dots;
208: union res_sockaddr_union u[2];
1.14 christos 209: int maxns = MAXNS;
210:
211: RES_SET_H_ERRNO(statp, 0);
212:
1.21 christos 213: if ((statp->options & RES_INIT) != 0U)
214: res_ndestroy(statp);
215:
1.1 christos 216: if (!preinit) {
217: statp->retrans = RES_TIMEOUT;
218: statp->retry = RES_DFLRETRY;
219: statp->options = RES_DEFAULT;
220: }
1.21 christos 221: statp->_rnd = malloc(16);
222: res_rndinit(statp);
223: statp->id = res_nrandomid(statp);
1.12 christos 224:
1.1 christos 225: memset(u, 0, sizeof(u));
226: #ifdef USELOOPBACK
227: u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
228: #else
229: u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
230: #endif
231: u[nserv].sin.sin_family = AF_INET;
232: u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
233: #ifdef HAVE_SA_LEN
234: u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
235: #endif
236: nserv++;
237: #ifdef HAS_INET6_STRUCTS
238: #ifdef USELOOPBACK
239: u[nserv].sin6.sin6_addr = in6addr_loopback;
240: #else
241: u[nserv].sin6.sin6_addr = in6addr_any;
242: #endif
243: u[nserv].sin6.sin6_family = AF_INET6;
244: u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
245: #ifdef HAVE_SA_LEN
246: u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
247: #endif
248: nserv++;
249: #endif
250: statp->nscount = 0;
251: statp->ndots = 1;
252: statp->pfcode = 0;
253: statp->_vcsock = -1;
254: statp->_flags = 0;
255: statp->qhook = NULL;
256: statp->rhook = NULL;
257: statp->_u._ext.nscount = 0;
258: statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
259: if (statp->_u._ext.ext != NULL) {
260: memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
261: statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
262: strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
263: strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14 christos 264: } else {
265: /*
266: * Historically res_init() rarely, if at all, failed.
267: * Examples and applications exist which do not check
268: * our return code. Furthermore several applications
269: * simply call us to get the systems domainname. So
1.27 wiz 270: * rather than immediately fail here we store the
1.14 christos 271: * failure, which is returned later, in h_errno. And
272: * prevent the collection of 'nameserver' information
273: * by setting maxns to 0. Thus applications that fail
274: * to check our return code wont be able to make
275: * queries anyhow.
276: */
277: RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
278: maxns = 0;
279: }
280: #ifdef RESOLVSORT
1.1 christos 281: statp->nsort = 0;
1.14 christos 282: #endif
1.1 christos 283: res_setservers(statp, u, nserv);
284:
1.9 christos 285: #ifdef SOLARIS2
286: /*
287: * The old libresolv derived the defaultdomain from NIS/NIS+.
288: * We want to keep this behaviour
289: */
290: {
291: char buf[sizeof(statp->defdname)], *cp;
292: int ret;
293:
294: if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
295: (unsigned int)ret <= sizeof(buf)) {
296: if (buf[0] == '+')
297: buf[0] = '.';
298: cp = strchr(buf, '.');
299: cp = (cp == NULL) ? buf : (cp + 1);
1.14 christos 300: (void)strlcpy(statp->defdname, cp,
301: sizeof(statp->defdname));
1.9 christos 302: }
303: }
304: #endif /* SOLARIS2 */
305:
1.1 christos 306: /* Allow user to override the local domain definition */
307: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
308: (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
309: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
310: haveenv++;
311:
312: /*
313: * Set search list to be blank-separated strings
314: * from rest of env value. Permits users of LOCALDOMAIN
315: * to still have a search list, and anyone to set the
316: * one that they want to use as an individual (even more
317: * important now that the rfc1535 stuff restricts searches)
318: */
319: cp = statp->defdname;
320: pp = statp->dnsrch;
321: *pp++ = cp;
322: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9 christos 323: if (*cp == '\n') /*%< silly backwards compat */
1.1 christos 324: break;
325: else if (*cp == ' ' || *cp == '\t') {
326: *cp = 0;
327: n = 1;
328: } else if (n) {
329: *pp++ = cp;
330: n = 0;
331: havesearch = 1;
332: }
333: }
334: /* null terminate last domain if there are excess */
335: while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
336: cp++;
337: *cp = '\0';
338: *pp++ = 0;
339: }
340:
341: #define MATCH(line, name) \
342: (!strncmp(line, name, sizeof(name) - 1) && \
343: (line[sizeof(name) - 1] == ' ' || \
344: line[sizeof(name) - 1] == '\t'))
345:
346: nserv = 0;
1.28 christos 347: if ((fp = fopen(__res_conf_name, "re")) != NULL) {
1.21 christos 348: struct stat st;
349: struct kevent kc;
350:
1.1 christos 351: /* read the config file */
1.24 christos 352: while (fgets(buf, (int)sizeof(buf), fp) != NULL) {
1.1 christos 353: /* skip comments */
354: if (*buf == ';' || *buf == '#')
355: continue;
356: /* read default domain name */
357: if (MATCH(buf, "domain")) {
1.9 christos 358: if (haveenv) /*%< skip if have from environ */
1.1 christos 359: continue;
360: cp = buf + sizeof("domain") - 1;
361: while (*cp == ' ' || *cp == '\t')
362: cp++;
363: if ((*cp == '\0') || (*cp == '\n'))
364: continue;
365: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
366: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
367: if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
368: *cp = '\0';
369: havesearch = 0;
370: continue;
371: }
372: /* set search list */
373: if (MATCH(buf, "search")) {
1.9 christos 374: if (haveenv) /*%< skip if have from environ */
1.1 christos 375: continue;
376: cp = buf + sizeof("search") - 1;
377: while (*cp == ' ' || *cp == '\t')
378: cp++;
379: if ((*cp == '\0') || (*cp == '\n'))
380: continue;
381: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
382: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
383: if ((cp = strchr(statp->defdname, '\n')) != NULL)
384: *cp = '\0';
385: /*
386: * Set search list to be blank-separated strings
387: * on rest of line.
388: */
389: cp = statp->defdname;
390: pp = statp->dnsrch;
391: *pp++ = cp;
392: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
393: if (*cp == ' ' || *cp == '\t') {
394: *cp = 0;
395: n = 1;
396: } else if (n) {
397: *pp++ = cp;
398: n = 0;
399: }
400: }
401: /* null terminate last domain if there are excess */
402: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
403: cp++;
404: *cp = '\0';
405: *pp++ = 0;
406: havesearch = 1;
407: continue;
408: }
409: /* read nameservers to query */
1.14 christos 410: if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1 christos 411: struct addrinfo hints, *ai;
412: char sbuf[NI_MAXSERV];
413: const size_t minsiz =
414: sizeof(statp->_u._ext.ext->nsaddrs[0]);
415:
416: cp = buf + sizeof("nameserver") - 1;
417: while (*cp == ' ' || *cp == '\t')
418: cp++;
419: cp[strcspn(cp, ";# \t\n")] = '\0';
420: if ((*cp != '\0') && (*cp != '\n')) {
421: memset(&hints, 0, sizeof(hints));
422: hints.ai_family = PF_UNSPEC;
423: hints.ai_socktype = SOCK_DGRAM; /*dummy*/
424: hints.ai_flags = AI_NUMERICHOST;
425: sprintf(sbuf, "%u", NAMESERVER_PORT);
426: if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
427: ai->ai_addrlen <= minsiz) {
428: if (statp->_u._ext.ext != NULL) {
429: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
430: ai->ai_addr, ai->ai_addrlen);
431: }
432: if (ai->ai_addrlen <=
433: sizeof(statp->nsaddr_list[nserv])) {
434: memcpy(&statp->nsaddr_list[nserv],
435: ai->ai_addr, ai->ai_addrlen);
436: } else
437: statp->nsaddr_list[nserv].sin_family = 0;
438: freeaddrinfo(ai);
439: nserv++;
440: }
441: }
442: continue;
443: }
1.14 christos 444: #ifdef RESOLVSORT
1.1 christos 445: if (MATCH(buf, "sortlist")) {
446: struct in_addr a;
447:
448: cp = buf + sizeof("sortlist") - 1;
449: while (nsort < MAXRESOLVSORT) {
450: while (*cp == ' ' || *cp == '\t')
451: cp++;
452: if (*cp == '\0' || *cp == '\n' || *cp == ';')
453: break;
454: net = cp;
455: while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
456: isascii(*cp) && !isspace((unsigned char)*cp))
457: cp++;
458: n = *cp;
459: *cp = 0;
460: if (inet_aton(net, &a)) {
461: statp->sort_list[nsort].addr = a;
462: if (ISSORTMASK(n)) {
463: *cp++ = n;
464: net = cp;
465: while (*cp && *cp != ';' &&
466: isascii(*cp) &&
467: !isspace((unsigned char)*cp))
468: cp++;
469: n = *cp;
470: *cp = 0;
471: if (inet_aton(net, &a)) {
472: statp->sort_list[nsort].mask = a.s_addr;
473: } else {
474: statp->sort_list[nsort].mask =
475: net_mask(statp->sort_list[nsort].addr);
476: }
477: } else {
478: statp->sort_list[nsort].mask =
479: net_mask(statp->sort_list[nsort].addr);
480: }
481: nsort++;
482: }
483: *cp = n;
484: }
485: continue;
486: }
1.14 christos 487: #endif
1.1 christos 488: if (MATCH(buf, "options")) {
489: res_setoptions(statp, buf + sizeof("options") - 1, "conf");
490: continue;
491: }
492: }
493: if (nserv > 0)
494: statp->nscount = nserv;
1.14 christos 495: #ifdef RESOLVSORT
1.1 christos 496: statp->nsort = nsort;
1.14 christos 497: #endif
1.29 christos 498: statp->_u._ext.ext->resfd = fcntl(fileno(fp), F_DUPFD_CLOEXEC);
1.1 christos 499: (void) fclose(fp);
1.21 christos 500: if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
501: __res_conf_time = statp->_u._ext.ext->res_conf_time =
502: st.st_mtimespec;
1.23 christos 503: statp->_u._ext.ext->kq = kqueue1(O_CLOEXEC);
1.21 christos 504: EV_SET(&kc, statp->_u._ext.ext->resfd, EVFILT_VNODE,
505: EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND|
506: NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0);
507: (void)kevent(statp->_u._ext.ext->kq, &kc, 1, NULL, 0, &ts);
508: } else {
509: statp->_u._ext.ext->kq = -1;
510: statp->_u._ext.ext->resfd = -1;
1.1 christos 511: }
512: /*
513: * Last chance to get a nameserver. This should not normally
514: * be necessary
515: */
516: #ifdef NO_RESOLV_CONF
517: if(nserv == 0)
518: nserv = get_nameservers(statp);
519: #endif
520:
521: if (statp->defdname[0] == 0 &&
522: gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
523: (cp = strchr(buf, '.')) != NULL)
524: strcpy(statp->defdname, cp + 1);
525:
526: /* find components of local domain that might be searched */
527: if (havesearch == 0) {
528: pp = statp->dnsrch;
529: *pp++ = statp->defdname;
530: *pp = NULL;
531:
532: dots = 0;
533: for (cp = statp->defdname; *cp; cp++)
534: dots += (*cp == '.');
535:
536: cp = statp->defdname;
537: while (pp < statp->dnsrch + MAXDFLSRCH) {
538: if (dots < LOCALDOMAINPARTS)
539: break;
1.9 christos 540: cp = strchr(cp, '.') + 1; /*%< we know there is one */
1.1 christos 541: *pp++ = cp;
542: dots--;
543: }
544: *pp = NULL;
545: #ifdef DEBUG
546: if (statp->options & RES_DEBUG) {
547: printf(";; res_init()... default dnsrch list:\n");
548: for (pp = statp->dnsrch; *pp; pp++)
549: printf(";;\t%s\n", *pp);
550: printf(";;\t..END..\n");
551: }
552: #endif
553: }
554:
555: if ((cp = getenv("RES_OPTIONS")) != NULL)
556: res_setoptions(statp, cp, "env");
557: statp->options |= RES_INIT;
1.14 christos 558: return (statp->res_h_errno);
1.1 christos 559: }
560:
1.22 christos 561: int
562: res_check(res_state statp, struct timespec *mtime)
1.21 christos 563: {
564: /*
565: * If the times are equal, then we check if there
566: * was a kevent related to resolv.conf and reload.
567: * If the times are not equal, then we don't bother
568: * to check the kevent, because another thread already
569: * did, loaded and changed the time.
570: */
571: if (timespeccmp(&statp->_u._ext.ext->res_conf_time,
572: &__res_conf_time, ==)) {
573: struct kevent ke;
574: if (statp->_u._ext.ext->kq == -1)
1.22 christos 575: goto out;
1.21 christos 576:
577: switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
578: case 0:
579: case -1:
1.22 christos 580: out:
581: if (mtime)
582: *mtime = __res_conf_time;
583: return 0;
1.21 christos 584: default:
585: break;
586: }
587: }
588: (void)__res_vinit(statp, 0);
1.22 christos 589: if (mtime)
590: *mtime = __res_conf_time;
591: return 1;
1.21 christos 592: }
593:
1.1 christos 594: static void
595: res_setoptions(res_state statp, const char *options, const char *source)
596: {
597: const char *cp = options;
598: int i;
1.24 christos 599: size_t j;
1.1 christos 600: struct __res_state_ext *ext = statp->_u._ext.ext;
601:
602: #ifdef DEBUG
603: if (statp->options & RES_DEBUG)
604: printf(";; res_setoptions(\"%s\", \"%s\")...\n",
605: options, source);
606: #endif
607: while (*cp) {
608: /* skip leading and inner runs of spaces */
609: while (*cp == ' ' || *cp == '\t')
610: cp++;
611: /* search for and process individual options */
612: if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
613: i = atoi(cp + sizeof("ndots:") - 1);
614: if (i <= RES_MAXNDOTS)
615: statp->ndots = i;
616: else
617: statp->ndots = RES_MAXNDOTS;
618: #ifdef DEBUG
619: if (statp->options & RES_DEBUG)
620: printf(";;\tndots=%d\n", statp->ndots);
621: #endif
622: } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
623: i = atoi(cp + sizeof("timeout:") - 1);
624: if (i <= RES_MAXRETRANS)
625: statp->retrans = i;
626: else
627: statp->retrans = RES_MAXRETRANS;
628: #ifdef DEBUG
629: if (statp->options & RES_DEBUG)
630: printf(";;\ttimeout=%d\n", statp->retrans);
631: #endif
1.9 christos 632: #ifdef SOLARIS2
633: } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
634: /*
635: * For backward compatibility, 'retrans' is
636: * supported as an alias for 'timeout', though
637: * without an imposed maximum.
638: */
639: statp->retrans = atoi(cp + sizeof("retrans:") - 1);
640: } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
641: /*
642: * For backward compatibility, 'retry' is
643: * supported as an alias for 'attempts', though
644: * without an imposed maximum.
645: */
646: statp->retry = atoi(cp + sizeof("retry:") - 1);
647: #endif /* SOLARIS2 */
1.1 christos 648: } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
649: i = atoi(cp + sizeof("attempts:") - 1);
650: if (i <= RES_MAXRETRY)
651: statp->retry = i;
652: else
653: statp->retry = RES_MAXRETRY;
654: #ifdef DEBUG
655: if (statp->options & RES_DEBUG)
656: printf(";;\tattempts=%d\n", statp->retry);
657: #endif
658: } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
659: #ifdef DEBUG
660: if (!(statp->options & RES_DEBUG)) {
661: printf(";; res_setoptions(\"%s\", \"%s\")..\n",
662: options, source);
663: statp->options |= RES_DEBUG;
664: }
665: printf(";;\tdebug\n");
666: #endif
667: } else if (!strncmp(cp, "no_tld_query",
668: sizeof("no_tld_query") - 1) ||
669: !strncmp(cp, "no-tld-query",
670: sizeof("no-tld-query") - 1)) {
671: statp->options |= RES_NOTLDQUERY;
672: } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
673: statp->options |= RES_USE_INET6;
674: } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
675: statp->options |= RES_ROTATE;
676: } else if (!strncmp(cp, "no-check-names",
677: sizeof("no-check-names") - 1)) {
678: statp->options |= RES_NOCHECKNAME;
1.26 christos 679: } else if (!strncmp(cp, "check-names",
680: sizeof("check-names") - 1)) {
681: statp->options &= ~RES_NOCHECKNAME;
1.1 christos 682: }
683: #ifdef RES_USE_EDNS0
684: else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
685: statp->options |= RES_USE_EDNS0;
686: }
687: #endif
688: else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
689: statp->options |= RES_USE_DNAME;
690: }
691: else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
692: if (ext == NULL)
693: goto skip;
694: cp += sizeof("nibble:") - 1;
1.24 christos 695: j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
696: strncpy(ext->nsuffix, cp, j);
697: ext->nsuffix[j] = '\0';
1.1 christos 698: }
699: else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
700: if (ext == NULL)
701: goto skip;
702: cp += sizeof("nibble2:") - 1;
1.24 christos 703: j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
704: strncpy(ext->nsuffix2, cp, j);
705: ext->nsuffix2[j] = '\0';
1.1 christos 706: }
707: else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
708: cp += sizeof("v6revmode:") - 1;
709: /* "nibble" and "bitstring" used to be valid */
710: if (!strncmp(cp, "single", sizeof("single") - 1)) {
711: statp->options |= RES_NO_NIBBLE2;
712: } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
713: statp->options &=
714: ~RES_NO_NIBBLE2;
715: }
716: }
717: else {
718: /* XXX - print a warning here? */
719: }
720: skip:
721: /* skip to next run of spaces */
722: while (*cp && *cp != ' ' && *cp != '\t')
723: cp++;
724: }
725: }
726:
1.14 christos 727: #ifdef RESOLVSORT
1.1 christos 728: /* XXX - should really support CIDR which means explicit masks always. */
1.25 matt 729: static uint32_t
730: net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
1.1 christos 731: {
1.25 matt 732: register uint32_t i = ntohl(in.s_addr);
1.1 christos 733:
734: if (IN_CLASSA(i))
735: return (htonl(IN_CLASSA_NET));
736: else if (IN_CLASSB(i))
737: return (htonl(IN_CLASSB_NET));
738: return (htonl(IN_CLASSC_NET));
739: }
1.14 christos 740: #endif
1.1 christos 741:
1.20 christos 742: static u_char srnd[16];
743:
1.17 christos 744: void
745: res_rndinit(res_state statp)
746: {
747: struct timeval now;
1.25 matt 748: uint32_t u32;
749: uint16_t u16;
1.20 christos 750: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.17 christos 751:
752: gettimeofday(&now, NULL);
1.25 matt 753: u32 = (uint32_t)now.tv_sec;
1.20 christos 754: memcpy(rnd, &u32, 4);
1.17 christos 755: u32 = now.tv_usec;
1.20 christos 756: memcpy(rnd + 4, &u32, 4);
1.25 matt 757: u32 += (uint32_t)now.tv_sec;
1.20 christos 758: memcpy(rnd + 8, &u32, 4);
1.17 christos 759: u16 = getpid();
1.20 christos 760: memcpy(rnd + 12, &u16, 2);
1.17 christos 761: }
762:
1.1 christos 763: u_int
1.25 matt 764: res_nrandomid(res_state statp)
765: {
1.1 christos 766: struct timeval now;
1.25 matt 767: uint16_t u16;
1.17 christos 768: MD5_CTX ctx;
1.20 christos 769: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1 christos 770:
771: gettimeofday(&now, NULL);
1.25 matt 772: u16 = (uint16_t) (now.tv_sec ^ now.tv_usec);
1.20 christos 773: memcpy(rnd + 14, &u16, 2);
1.17 christos 774: #ifndef HAVE_MD5
775: MD5_Init(&ctx);
1.20 christos 776: MD5_Update(&ctx, rnd, 16);
777: MD5_Final(rnd, &ctx);
1.17 christos 778: #else
779: MD5Init(&ctx);
1.20 christos 780: MD5Update(&ctx, rnd, 16);
781: MD5Final(rnd, &ctx);
1.17 christos 782: #endif
1.20 christos 783: memcpy(&u16, rnd + 14, 2);
1.17 christos 784: return ((u_int) u16);
1.1 christos 785: }
786:
1.9 christos 787: /*%
1.1 christos 788: * This routine is for closing the socket if a virtual circuit is used and
789: * the program wants to close it. This provides support for endhostent()
790: * which expects to close the socket.
791: *
792: * This routine is not expected to be user visible.
793: */
794: void
1.25 matt 795: res_nclose(res_state statp)
796: {
1.1 christos 797: int ns;
798:
799: if (statp->_vcsock >= 0) {
800: (void) close(statp->_vcsock);
801: statp->_vcsock = -1;
802: statp->_flags &= ~(RES_F_VC | RES_F_CONN);
803: }
804: for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
805: if (statp->_u._ext.nssocks[ns] != -1) {
806: (void) close(statp->_u._ext.nssocks[ns]);
807: statp->_u._ext.nssocks[ns] = -1;
808: }
809: }
810: }
811:
812: void
1.25 matt 813: res_ndestroy(res_state statp)
814: {
1.1 christos 815: res_nclose(statp);
1.20 christos 816: if (statp->_u._ext.ext != NULL) {
1.21 christos 817: if (statp->_u._ext.ext->kq != -1)
818: (void)close(statp->_u._ext.ext->kq);
819: if (statp->_u._ext.ext->resfd != -1)
820: (void)close(statp->_u._ext.ext->resfd);
1.1 christos 821: free(statp->_u._ext.ext);
1.20 christos 822: statp->_u._ext.ext = NULL;
823: }
824: if (statp->_rnd != NULL) {
825: free(statp->_rnd);
826: statp->_rnd = NULL;
827: }
1.1 christos 828: statp->options &= ~RES_INIT;
829: }
830:
831: const char *
1.25 matt 832: res_get_nibblesuffix(res_state statp)
833: {
1.1 christos 834: if (statp->_u._ext.ext)
835: return (statp->_u._ext.ext->nsuffix);
836: return ("ip6.arpa");
837: }
838:
839: const char *
1.25 matt 840: res_get_nibblesuffix2(res_state statp)
841: {
1.1 christos 842: if (statp->_u._ext.ext)
843: return (statp->_u._ext.ext->nsuffix2);
844: return ("ip6.int");
845: }
846:
847: void
1.25 matt 848: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
849: {
1.1 christos 850: int i, nserv;
851: size_t size;
852:
853: /* close open servers */
854: res_nclose(statp);
855:
856: /* cause rtt times to be forgotten */
857: statp->_u._ext.nscount = 0;
858:
859: nserv = 0;
860: for (i = 0; i < cnt && nserv < MAXNS; i++) {
861: switch (set->sin.sin_family) {
862: case AF_INET:
863: size = sizeof(set->sin);
864: if (statp->_u._ext.ext)
865: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
866: &set->sin, size);
867: if (size <= sizeof(statp->nsaddr_list[nserv]))
868: memcpy(&statp->nsaddr_list[nserv],
869: &set->sin, size);
870: else
871: statp->nsaddr_list[nserv].sin_family = 0;
872: nserv++;
873: break;
874:
875: #ifdef HAS_INET6_STRUCTS
876: case AF_INET6:
877: size = sizeof(set->sin6);
878: if (statp->_u._ext.ext)
879: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
880: &set->sin6, size);
881: if (size <= sizeof(statp->nsaddr_list[nserv]))
882: memcpy(&statp->nsaddr_list[nserv],
883: &set->sin6, size);
884: else
885: statp->nsaddr_list[nserv].sin_family = 0;
886: nserv++;
887: break;
888: #endif
889:
890: default:
891: break;
892: }
893: set++;
894: }
895: statp->nscount = nserv;
896:
897: }
898:
899: int
1.25 matt 900: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
901: {
1.1 christos 902: int i;
903: size_t size;
1.25 matt 904: uint16_t family;
1.1 christos 905:
906: for (i = 0; i < statp->nscount && i < cnt; i++) {
907: if (statp->_u._ext.ext)
908: family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
909: else
910: family = statp->nsaddr_list[i].sin_family;
911:
912: switch (family) {
913: case AF_INET:
914: size = sizeof(set->sin);
915: if (statp->_u._ext.ext)
916: memcpy(&set->sin,
917: &statp->_u._ext.ext->nsaddrs[i],
918: size);
919: else
920: memcpy(&set->sin, &statp->nsaddr_list[i],
921: size);
922: break;
923:
924: #ifdef HAS_INET6_STRUCTS
925: case AF_INET6:
926: size = sizeof(set->sin6);
927: if (statp->_u._ext.ext)
928: memcpy(&set->sin6,
929: &statp->_u._ext.ext->nsaddrs[i],
930: size);
931: else
932: memcpy(&set->sin6, &statp->nsaddr_list[i],
933: size);
934: break;
935: #endif
936:
937: default:
938: set->sin.sin_family = 0;
939: break;
940: }
941: set++;
942: }
943: return (statp->nscount);
944: }
1.9 christos 945:
946: /*! \file */
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