Annotation of src/lib/libc/resolv/res_init.c, Revision 1.26.2.1
1.26.2.1! tls 1: /* $NetBSD$ */
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
1.26.2.1! tls 79: __RCSID("$NetBSD$");
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>
1.21 christos 89: #include <sys/stat.h>
1.1 christos 90: #include <sys/time.h>
1.21 christos 91: #include <sys/event.h>
1.1 christos 92:
93: #include <netinet/in.h>
94: #include <arpa/inet.h>
95: #include <arpa/nameser.h>
96:
97: #include <ctype.h>
98: #include <stdio.h>
99: #include <stdlib.h>
100: #include <string.h>
101: #include <unistd.h>
1.21 christos 102: #include <fcntl.h>
1.1 christos 103: #include <netdb.h>
104:
1.17 christos 105: #define HAVE_MD5
106: #include <md5.h>
107:
108: #ifndef HAVE_MD5
109: # include "../dst/md5.h"
110: #else
111: # ifdef SOLARIS2
112: # include <sys/md5.h>
113: # endif
114: #endif
115: #ifndef _MD5_H_
116: # define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
117: #endif
118:
1.1 christos 119: #include "port_after.h"
120:
1.5 christos 121: #if 0
1.4 christos 122: #ifdef __weak_alias
123: __weak_alias(res_ninit,_res_ninit)
124: __weak_alias(res_randomid,__res_randomid)
125: __weak_alias(res_nclose,_res_nclose)
126: __weak_alias(res_ndestroy,_res_ndestroy)
127: __weak_alias(res_get_nibblesuffix,__res_get_nibblesuffix)
128: __weak_alias(res_get_nibblesuffix2,__res_get_nibblesuffix2)
129: __weak_alias(res_getservers,__res_getservers)
130: __weak_alias(res_setservers,__res_setservers)
131: #endif
1.5 christos 132: #endif
1.4 christos 133:
134:
1.1 christos 135: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
136: #include <resolv.h>
137:
138: #include "res_private.h"
139:
1.15 christos 140: #define RESOLVSORT
1.9 christos 141: /*% Options. Should all be left alone. */
1.7 christos 142: #ifndef DEBUG
1.1 christos 143: #define DEBUG
1.7 christos 144: #endif
1.1 christos 145:
1.9 christos 146: #ifdef SOLARIS2
147: #include <sys/systeminfo.h>
148: #endif
149:
1.25 matt 150: static void res_setoptions(res_state, const char *, const char *);
1.1 christos 151:
1.14 christos 152: #ifdef RESOLVSORT
1.1 christos 153: static const char sort_mask[] = "/&";
154: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
1.25 matt 155: static uint32_t net_mask(struct in_addr);
1.14 christos 156: #endif
1.1 christos 157:
1.9 christos 158: #if !defined(isascii) /*%< XXX - could be a function */
1.1 christos 159: # define isascii(c) (!(c & 0200))
160: #endif
161:
1.21 christos 162: static struct timespec __res_conf_time;
163: static const struct timespec ts = { 0, 0 };
164:
1.26.2.1! tls 165: const char *__res_conf_name = _PATH_RESCONF;
! 166:
1.1 christos 167: /*
168: * Resolver state default settings.
169: */
170:
1.9 christos 171: /*%
1.1 christos 172: * Set up default settings. If the configuration file exist, the values
173: * there will have precedence. Otherwise, the server address is set to
174: * INADDR_ANY and the default domain name comes from the gethostname().
175: *
176: * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
177: * rather than INADDR_ANY ("0.0.0.0") as the default name server address
178: * since it was noted that INADDR_ANY actually meant ``the first interface
179: * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
180: * it had to be "up" in order for you to reach your own name server. It
181: * was later decided that since the recommended practice is to always
182: * install local static routes through 127.0.0.1 for all your network
183: * interfaces, that we could solve this problem without a code change.
184: *
185: * The configuration file should always be used, since it is the only way
186: * to specify a default domain. If you are running a server on your local
187: * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
188: * in the configuration file.
189: *
190: * Return 0 if completes successfully, -1 on error
191: */
192: int
193: res_ninit(res_state statp) {
194: return (__res_vinit(statp, 0));
195: }
196:
1.9 christos 197: /*% This function has to be reachable by res_data.c but not publically. */
1.1 christos 198: int
199: __res_vinit(res_state statp, int preinit) {
200: register FILE *fp;
201: register char *cp, **pp;
202: register int n;
203: char buf[BUFSIZ];
1.9 christos 204: int nserv = 0; /*%< number of nameserver records read from file */
1.1 christos 205: int haveenv = 0;
206: int havesearch = 0;
1.14 christos 207: #ifdef RESOLVSORT
1.1 christos 208: int nsort = 0;
209: char *net;
1.14 christos 210: #endif
1.1 christos 211: int dots;
212: union res_sockaddr_union u[2];
1.14 christos 213: int maxns = MAXNS;
214:
215: RES_SET_H_ERRNO(statp, 0);
216:
1.21 christos 217: if ((statp->options & RES_INIT) != 0U)
218: res_ndestroy(statp);
219:
1.1 christos 220: if (!preinit) {
221: statp->retrans = RES_TIMEOUT;
222: statp->retry = RES_DFLRETRY;
223: statp->options = RES_DEFAULT;
224: }
1.21 christos 225: statp->_rnd = malloc(16);
226: res_rndinit(statp);
227: statp->id = res_nrandomid(statp);
1.12 christos 228:
1.1 christos 229: memset(u, 0, sizeof(u));
230: #ifdef USELOOPBACK
231: u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
232: #else
233: u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
234: #endif
235: u[nserv].sin.sin_family = AF_INET;
236: u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
237: #ifdef HAVE_SA_LEN
238: u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
239: #endif
240: nserv++;
241: #ifdef HAS_INET6_STRUCTS
242: #ifdef USELOOPBACK
243: u[nserv].sin6.sin6_addr = in6addr_loopback;
244: #else
245: u[nserv].sin6.sin6_addr = in6addr_any;
246: #endif
247: u[nserv].sin6.sin6_family = AF_INET6;
248: u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
249: #ifdef HAVE_SA_LEN
250: u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
251: #endif
252: nserv++;
253: #endif
254: statp->nscount = 0;
255: statp->ndots = 1;
256: statp->pfcode = 0;
257: statp->_vcsock = -1;
258: statp->_flags = 0;
259: statp->qhook = NULL;
260: statp->rhook = NULL;
261: statp->_u._ext.nscount = 0;
262: statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
263: if (statp->_u._ext.ext != NULL) {
264: memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
265: statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
266: strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
267: strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14 christos 268: } else {
269: /*
270: * Historically res_init() rarely, if at all, failed.
271: * Examples and applications exist which do not check
272: * our return code. Furthermore several applications
273: * simply call us to get the systems domainname. So
1.26.2.1! tls 274: * rather than immediately fail here we store the
1.14 christos 275: * failure, which is returned later, in h_errno. And
276: * prevent the collection of 'nameserver' information
277: * by setting maxns to 0. Thus applications that fail
278: * to check our return code wont be able to make
279: * queries anyhow.
280: */
281: RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
282: maxns = 0;
283: }
284: #ifdef RESOLVSORT
1.1 christos 285: statp->nsort = 0;
1.14 christos 286: #endif
1.1 christos 287: res_setservers(statp, u, nserv);
288:
1.9 christos 289: #ifdef SOLARIS2
290: /*
291: * The old libresolv derived the defaultdomain from NIS/NIS+.
292: * We want to keep this behaviour
293: */
294: {
295: char buf[sizeof(statp->defdname)], *cp;
296: int ret;
297:
298: if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
299: (unsigned int)ret <= sizeof(buf)) {
300: if (buf[0] == '+')
301: buf[0] = '.';
302: cp = strchr(buf, '.');
303: cp = (cp == NULL) ? buf : (cp + 1);
1.14 christos 304: (void)strlcpy(statp->defdname, cp,
305: sizeof(statp->defdname));
1.9 christos 306: }
307: }
308: #endif /* SOLARIS2 */
309:
1.1 christos 310: /* Allow user to override the local domain definition */
311: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
312: (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
313: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
314: haveenv++;
315:
316: /*
317: * Set search list to be blank-separated strings
318: * from rest of env value. Permits users of LOCALDOMAIN
319: * to still have a search list, and anyone to set the
320: * one that they want to use as an individual (even more
321: * important now that the rfc1535 stuff restricts searches)
322: */
323: cp = statp->defdname;
324: pp = statp->dnsrch;
325: *pp++ = cp;
326: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9 christos 327: if (*cp == '\n') /*%< silly backwards compat */
1.1 christos 328: break;
329: else if (*cp == ' ' || *cp == '\t') {
330: *cp = 0;
331: n = 1;
332: } else if (n) {
333: *pp++ = cp;
334: n = 0;
335: havesearch = 1;
336: }
337: }
338: /* null terminate last domain if there are excess */
339: while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
340: cp++;
341: *cp = '\0';
342: *pp++ = 0;
343: }
344:
345: #define MATCH(line, name) \
346: (!strncmp(line, name, sizeof(name) - 1) && \
347: (line[sizeof(name) - 1] == ' ' || \
348: line[sizeof(name) - 1] == '\t'))
349:
350: nserv = 0;
1.26.2.1! tls 351: if ((fp = fopen(__res_conf_name, "re")) != NULL) {
1.21 christos 352: struct stat st;
353: struct kevent kc;
354:
1.1 christos 355: /* read the config file */
1.24 christos 356: while (fgets(buf, (int)sizeof(buf), fp) != NULL) {
1.1 christos 357: /* skip comments */
358: if (*buf == ';' || *buf == '#')
359: continue;
360: /* read default domain name */
361: if (MATCH(buf, "domain")) {
1.9 christos 362: if (haveenv) /*%< skip if have from environ */
1.1 christos 363: continue;
364: cp = buf + sizeof("domain") - 1;
365: while (*cp == ' ' || *cp == '\t')
366: cp++;
367: if ((*cp == '\0') || (*cp == '\n'))
368: continue;
369: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
370: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
371: if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
372: *cp = '\0';
373: havesearch = 0;
374: continue;
375: }
376: /* set search list */
377: if (MATCH(buf, "search")) {
1.9 christos 378: if (haveenv) /*%< skip if have from environ */
1.1 christos 379: continue;
380: cp = buf + sizeof("search") - 1;
381: while (*cp == ' ' || *cp == '\t')
382: cp++;
383: if ((*cp == '\0') || (*cp == '\n'))
384: continue;
385: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
386: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
387: if ((cp = strchr(statp->defdname, '\n')) != NULL)
388: *cp = '\0';
389: /*
390: * Set search list to be blank-separated strings
391: * on rest of line.
392: */
393: cp = statp->defdname;
394: pp = statp->dnsrch;
395: *pp++ = cp;
396: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
397: if (*cp == ' ' || *cp == '\t') {
398: *cp = 0;
399: n = 1;
400: } else if (n) {
401: *pp++ = cp;
402: n = 0;
403: }
404: }
405: /* null terminate last domain if there are excess */
406: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
407: cp++;
408: *cp = '\0';
409: *pp++ = 0;
410: havesearch = 1;
411: continue;
412: }
413: /* read nameservers to query */
1.14 christos 414: if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1 christos 415: struct addrinfo hints, *ai;
416: char sbuf[NI_MAXSERV];
417: const size_t minsiz =
418: sizeof(statp->_u._ext.ext->nsaddrs[0]);
419:
420: cp = buf + sizeof("nameserver") - 1;
421: while (*cp == ' ' || *cp == '\t')
422: cp++;
423: cp[strcspn(cp, ";# \t\n")] = '\0';
424: if ((*cp != '\0') && (*cp != '\n')) {
425: memset(&hints, 0, sizeof(hints));
426: hints.ai_family = PF_UNSPEC;
427: hints.ai_socktype = SOCK_DGRAM; /*dummy*/
428: hints.ai_flags = AI_NUMERICHOST;
429: sprintf(sbuf, "%u", NAMESERVER_PORT);
430: if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
431: ai->ai_addrlen <= minsiz) {
432: if (statp->_u._ext.ext != NULL) {
433: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
434: ai->ai_addr, ai->ai_addrlen);
435: }
436: if (ai->ai_addrlen <=
437: sizeof(statp->nsaddr_list[nserv])) {
438: memcpy(&statp->nsaddr_list[nserv],
439: ai->ai_addr, ai->ai_addrlen);
440: } else
441: statp->nsaddr_list[nserv].sin_family = 0;
442: freeaddrinfo(ai);
443: nserv++;
444: }
445: }
446: continue;
447: }
1.14 christos 448: #ifdef RESOLVSORT
1.1 christos 449: if (MATCH(buf, "sortlist")) {
450: struct in_addr a;
451:
452: cp = buf + sizeof("sortlist") - 1;
453: while (nsort < MAXRESOLVSORT) {
454: while (*cp == ' ' || *cp == '\t')
455: cp++;
456: if (*cp == '\0' || *cp == '\n' || *cp == ';')
457: break;
458: net = cp;
459: while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
460: isascii(*cp) && !isspace((unsigned char)*cp))
461: cp++;
462: n = *cp;
463: *cp = 0;
464: if (inet_aton(net, &a)) {
465: statp->sort_list[nsort].addr = a;
466: if (ISSORTMASK(n)) {
467: *cp++ = n;
468: net = cp;
469: while (*cp && *cp != ';' &&
470: isascii(*cp) &&
471: !isspace((unsigned char)*cp))
472: cp++;
473: n = *cp;
474: *cp = 0;
475: if (inet_aton(net, &a)) {
476: statp->sort_list[nsort].mask = a.s_addr;
477: } else {
478: statp->sort_list[nsort].mask =
479: net_mask(statp->sort_list[nsort].addr);
480: }
481: } else {
482: statp->sort_list[nsort].mask =
483: net_mask(statp->sort_list[nsort].addr);
484: }
485: nsort++;
486: }
487: *cp = n;
488: }
489: continue;
490: }
1.14 christos 491: #endif
1.1 christos 492: if (MATCH(buf, "options")) {
493: res_setoptions(statp, buf + sizeof("options") - 1, "conf");
494: continue;
495: }
496: }
497: if (nserv > 0)
498: statp->nscount = nserv;
1.14 christos 499: #ifdef RESOLVSORT
1.1 christos 500: statp->nsort = nsort;
1.14 christos 501: #endif
1.21 christos 502: statp->_u._ext.ext->resfd = dup(fileno(fp));
1.1 christos 503: (void) fclose(fp);
1.21 christos 504: if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
505: __res_conf_time = statp->_u._ext.ext->res_conf_time =
506: st.st_mtimespec;
1.23 christos 507: statp->_u._ext.ext->kq = kqueue1(O_CLOEXEC);
1.21 christos 508: EV_SET(&kc, statp->_u._ext.ext->resfd, EVFILT_VNODE,
509: EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND|
510: NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0);
511: (void)kevent(statp->_u._ext.ext->kq, &kc, 1, NULL, 0, &ts);
512: } else {
513: statp->_u._ext.ext->kq = -1;
514: statp->_u._ext.ext->resfd = -1;
1.1 christos 515: }
516: /*
517: * Last chance to get a nameserver. This should not normally
518: * be necessary
519: */
520: #ifdef NO_RESOLV_CONF
521: if(nserv == 0)
522: nserv = get_nameservers(statp);
523: #endif
524:
525: if (statp->defdname[0] == 0 &&
526: gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
527: (cp = strchr(buf, '.')) != NULL)
528: strcpy(statp->defdname, cp + 1);
529:
530: /* find components of local domain that might be searched */
531: if (havesearch == 0) {
532: pp = statp->dnsrch;
533: *pp++ = statp->defdname;
534: *pp = NULL;
535:
536: dots = 0;
537: for (cp = statp->defdname; *cp; cp++)
538: dots += (*cp == '.');
539:
540: cp = statp->defdname;
541: while (pp < statp->dnsrch + MAXDFLSRCH) {
542: if (dots < LOCALDOMAINPARTS)
543: break;
1.9 christos 544: cp = strchr(cp, '.') + 1; /*%< we know there is one */
1.1 christos 545: *pp++ = cp;
546: dots--;
547: }
548: *pp = NULL;
549: #ifdef DEBUG
550: if (statp->options & RES_DEBUG) {
551: printf(";; res_init()... default dnsrch list:\n");
552: for (pp = statp->dnsrch; *pp; pp++)
553: printf(";;\t%s\n", *pp);
554: printf(";;\t..END..\n");
555: }
556: #endif
557: }
558:
559: if ((cp = getenv("RES_OPTIONS")) != NULL)
560: res_setoptions(statp, cp, "env");
561: statp->options |= RES_INIT;
1.14 christos 562: return (statp->res_h_errno);
1.1 christos 563: }
564:
1.22 christos 565: int
566: res_check(res_state statp, struct timespec *mtime)
1.21 christos 567: {
568: /*
569: * If the times are equal, then we check if there
570: * was a kevent related to resolv.conf and reload.
571: * If the times are not equal, then we don't bother
572: * to check the kevent, because another thread already
573: * did, loaded and changed the time.
574: */
575: if (timespeccmp(&statp->_u._ext.ext->res_conf_time,
576: &__res_conf_time, ==)) {
577: struct kevent ke;
578: if (statp->_u._ext.ext->kq == -1)
1.22 christos 579: goto out;
1.21 christos 580:
581: switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
582: case 0:
583: case -1:
1.22 christos 584: out:
585: if (mtime)
586: *mtime = __res_conf_time;
587: return 0;
1.21 christos 588: default:
589: break;
590: }
591: }
592: (void)__res_vinit(statp, 0);
1.22 christos 593: if (mtime)
594: *mtime = __res_conf_time;
595: return 1;
1.21 christos 596: }
597:
1.1 christos 598: static void
599: res_setoptions(res_state statp, const char *options, const char *source)
600: {
601: const char *cp = options;
602: int i;
1.24 christos 603: size_t j;
1.1 christos 604: struct __res_state_ext *ext = statp->_u._ext.ext;
605:
606: #ifdef DEBUG
607: if (statp->options & RES_DEBUG)
608: printf(";; res_setoptions(\"%s\", \"%s\")...\n",
609: options, source);
610: #endif
611: while (*cp) {
612: /* skip leading and inner runs of spaces */
613: while (*cp == ' ' || *cp == '\t')
614: cp++;
615: /* search for and process individual options */
616: if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
617: i = atoi(cp + sizeof("ndots:") - 1);
618: if (i <= RES_MAXNDOTS)
619: statp->ndots = i;
620: else
621: statp->ndots = RES_MAXNDOTS;
622: #ifdef DEBUG
623: if (statp->options & RES_DEBUG)
624: printf(";;\tndots=%d\n", statp->ndots);
625: #endif
626: } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
627: i = atoi(cp + sizeof("timeout:") - 1);
628: if (i <= RES_MAXRETRANS)
629: statp->retrans = i;
630: else
631: statp->retrans = RES_MAXRETRANS;
632: #ifdef DEBUG
633: if (statp->options & RES_DEBUG)
634: printf(";;\ttimeout=%d\n", statp->retrans);
635: #endif
1.9 christos 636: #ifdef SOLARIS2
637: } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
638: /*
639: * For backward compatibility, 'retrans' is
640: * supported as an alias for 'timeout', though
641: * without an imposed maximum.
642: */
643: statp->retrans = atoi(cp + sizeof("retrans:") - 1);
644: } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
645: /*
646: * For backward compatibility, 'retry' is
647: * supported as an alias for 'attempts', though
648: * without an imposed maximum.
649: */
650: statp->retry = atoi(cp + sizeof("retry:") - 1);
651: #endif /* SOLARIS2 */
1.1 christos 652: } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
653: i = atoi(cp + sizeof("attempts:") - 1);
654: if (i <= RES_MAXRETRY)
655: statp->retry = i;
656: else
657: statp->retry = RES_MAXRETRY;
658: #ifdef DEBUG
659: if (statp->options & RES_DEBUG)
660: printf(";;\tattempts=%d\n", statp->retry);
661: #endif
662: } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
663: #ifdef DEBUG
664: if (!(statp->options & RES_DEBUG)) {
665: printf(";; res_setoptions(\"%s\", \"%s\")..\n",
666: options, source);
667: statp->options |= RES_DEBUG;
668: }
669: printf(";;\tdebug\n");
670: #endif
671: } else if (!strncmp(cp, "no_tld_query",
672: sizeof("no_tld_query") - 1) ||
673: !strncmp(cp, "no-tld-query",
674: sizeof("no-tld-query") - 1)) {
675: statp->options |= RES_NOTLDQUERY;
676: } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
677: statp->options |= RES_USE_INET6;
678: } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
679: statp->options |= RES_ROTATE;
680: } else if (!strncmp(cp, "no-check-names",
681: sizeof("no-check-names") - 1)) {
682: statp->options |= RES_NOCHECKNAME;
1.26 christos 683: } else if (!strncmp(cp, "check-names",
684: sizeof("check-names") - 1)) {
685: statp->options &= ~RES_NOCHECKNAME;
1.1 christos 686: }
687: #ifdef RES_USE_EDNS0
688: else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
689: statp->options |= RES_USE_EDNS0;
690: }
691: #endif
692: else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
693: statp->options |= RES_USE_DNAME;
694: }
695: else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
696: if (ext == NULL)
697: goto skip;
698: cp += sizeof("nibble:") - 1;
1.24 christos 699: j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
700: strncpy(ext->nsuffix, cp, j);
701: ext->nsuffix[j] = '\0';
1.1 christos 702: }
703: else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
704: if (ext == NULL)
705: goto skip;
706: cp += sizeof("nibble2:") - 1;
1.24 christos 707: j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
708: strncpy(ext->nsuffix2, cp, j);
709: ext->nsuffix2[j] = '\0';
1.1 christos 710: }
711: else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
712: cp += sizeof("v6revmode:") - 1;
713: /* "nibble" and "bitstring" used to be valid */
714: if (!strncmp(cp, "single", sizeof("single") - 1)) {
715: statp->options |= RES_NO_NIBBLE2;
716: } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
717: statp->options &=
718: ~RES_NO_NIBBLE2;
719: }
720: }
721: else {
722: /* XXX - print a warning here? */
723: }
724: skip:
725: /* skip to next run of spaces */
726: while (*cp && *cp != ' ' && *cp != '\t')
727: cp++;
728: }
729: }
730:
1.14 christos 731: #ifdef RESOLVSORT
1.1 christos 732: /* XXX - should really support CIDR which means explicit masks always. */
1.25 matt 733: static uint32_t
734: net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
1.1 christos 735: {
1.25 matt 736: register uint32_t i = ntohl(in.s_addr);
1.1 christos 737:
738: if (IN_CLASSA(i))
739: return (htonl(IN_CLASSA_NET));
740: else if (IN_CLASSB(i))
741: return (htonl(IN_CLASSB_NET));
742: return (htonl(IN_CLASSC_NET));
743: }
1.14 christos 744: #endif
1.1 christos 745:
1.20 christos 746: static u_char srnd[16];
747:
1.17 christos 748: void
749: res_rndinit(res_state statp)
750: {
751: struct timeval now;
1.25 matt 752: uint32_t u32;
753: uint16_t u16;
1.20 christos 754: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.17 christos 755:
756: gettimeofday(&now, NULL);
1.25 matt 757: u32 = (uint32_t)now.tv_sec;
1.20 christos 758: memcpy(rnd, &u32, 4);
1.17 christos 759: u32 = now.tv_usec;
1.20 christos 760: memcpy(rnd + 4, &u32, 4);
1.25 matt 761: u32 += (uint32_t)now.tv_sec;
1.20 christos 762: memcpy(rnd + 8, &u32, 4);
1.17 christos 763: u16 = getpid();
1.20 christos 764: memcpy(rnd + 12, &u16, 2);
1.17 christos 765: }
766:
1.1 christos 767: u_int
1.25 matt 768: res_nrandomid(res_state statp)
769: {
1.1 christos 770: struct timeval now;
1.25 matt 771: uint16_t u16;
1.17 christos 772: MD5_CTX ctx;
1.20 christos 773: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1 christos 774:
775: gettimeofday(&now, NULL);
1.25 matt 776: u16 = (uint16_t) (now.tv_sec ^ now.tv_usec);
1.20 christos 777: memcpy(rnd + 14, &u16, 2);
1.17 christos 778: #ifndef HAVE_MD5
779: MD5_Init(&ctx);
1.20 christos 780: MD5_Update(&ctx, rnd, 16);
781: MD5_Final(rnd, &ctx);
1.17 christos 782: #else
783: MD5Init(&ctx);
1.20 christos 784: MD5Update(&ctx, rnd, 16);
785: MD5Final(rnd, &ctx);
1.17 christos 786: #endif
1.20 christos 787: memcpy(&u16, rnd + 14, 2);
1.17 christos 788: return ((u_int) u16);
1.1 christos 789: }
790:
1.9 christos 791: /*%
1.1 christos 792: * This routine is for closing the socket if a virtual circuit is used and
793: * the program wants to close it. This provides support for endhostent()
794: * which expects to close the socket.
795: *
796: * This routine is not expected to be user visible.
797: */
798: void
1.25 matt 799: res_nclose(res_state statp)
800: {
1.1 christos 801: int ns;
802:
803: if (statp->_vcsock >= 0) {
804: (void) close(statp->_vcsock);
805: statp->_vcsock = -1;
806: statp->_flags &= ~(RES_F_VC | RES_F_CONN);
807: }
808: for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
809: if (statp->_u._ext.nssocks[ns] != -1) {
810: (void) close(statp->_u._ext.nssocks[ns]);
811: statp->_u._ext.nssocks[ns] = -1;
812: }
813: }
814: }
815:
816: void
1.25 matt 817: res_ndestroy(res_state statp)
818: {
1.1 christos 819: res_nclose(statp);
1.20 christos 820: if (statp->_u._ext.ext != NULL) {
1.21 christos 821: if (statp->_u._ext.ext->kq != -1)
822: (void)close(statp->_u._ext.ext->kq);
823: if (statp->_u._ext.ext->resfd != -1)
824: (void)close(statp->_u._ext.ext->resfd);
1.1 christos 825: free(statp->_u._ext.ext);
1.20 christos 826: statp->_u._ext.ext = NULL;
827: }
828: if (statp->_rnd != NULL) {
829: free(statp->_rnd);
830: statp->_rnd = NULL;
831: }
1.1 christos 832: statp->options &= ~RES_INIT;
833: }
834:
835: const char *
1.25 matt 836: res_get_nibblesuffix(res_state statp)
837: {
1.1 christos 838: if (statp->_u._ext.ext)
839: return (statp->_u._ext.ext->nsuffix);
840: return ("ip6.arpa");
841: }
842:
843: const char *
1.25 matt 844: res_get_nibblesuffix2(res_state statp)
845: {
1.1 christos 846: if (statp->_u._ext.ext)
847: return (statp->_u._ext.ext->nsuffix2);
848: return ("ip6.int");
849: }
850:
851: void
1.25 matt 852: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
853: {
1.1 christos 854: int i, nserv;
855: size_t size;
856:
857: /* close open servers */
858: res_nclose(statp);
859:
860: /* cause rtt times to be forgotten */
861: statp->_u._ext.nscount = 0;
862:
863: nserv = 0;
864: for (i = 0; i < cnt && nserv < MAXNS; i++) {
865: switch (set->sin.sin_family) {
866: case AF_INET:
867: size = sizeof(set->sin);
868: if (statp->_u._ext.ext)
869: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
870: &set->sin, size);
871: if (size <= sizeof(statp->nsaddr_list[nserv]))
872: memcpy(&statp->nsaddr_list[nserv],
873: &set->sin, size);
874: else
875: statp->nsaddr_list[nserv].sin_family = 0;
876: nserv++;
877: break;
878:
879: #ifdef HAS_INET6_STRUCTS
880: case AF_INET6:
881: size = sizeof(set->sin6);
882: if (statp->_u._ext.ext)
883: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
884: &set->sin6, size);
885: if (size <= sizeof(statp->nsaddr_list[nserv]))
886: memcpy(&statp->nsaddr_list[nserv],
887: &set->sin6, size);
888: else
889: statp->nsaddr_list[nserv].sin_family = 0;
890: nserv++;
891: break;
892: #endif
893:
894: default:
895: break;
896: }
897: set++;
898: }
899: statp->nscount = nserv;
900:
901: }
902:
903: int
1.25 matt 904: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
905: {
1.1 christos 906: int i;
907: size_t size;
1.25 matt 908: uint16_t family;
1.1 christos 909:
910: for (i = 0; i < statp->nscount && i < cnt; i++) {
911: if (statp->_u._ext.ext)
912: family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
913: else
914: family = statp->nsaddr_list[i].sin_family;
915:
916: switch (family) {
917: case AF_INET:
918: size = sizeof(set->sin);
919: if (statp->_u._ext.ext)
920: memcpy(&set->sin,
921: &statp->_u._ext.ext->nsaddrs[i],
922: size);
923: else
924: memcpy(&set->sin, &statp->nsaddr_list[i],
925: size);
926: break;
927:
928: #ifdef HAS_INET6_STRUCTS
929: case AF_INET6:
930: size = sizeof(set->sin6);
931: if (statp->_u._ext.ext)
932: memcpy(&set->sin6,
933: &statp->_u._ext.ext->nsaddrs[i],
934: size);
935: else
936: memcpy(&set->sin6, &statp->nsaddr_list[i],
937: size);
938: break;
939: #endif
940:
941: default:
942: set->sin.sin_family = 0;
943: break;
944: }
945: set++;
946: }
947: return (statp->nscount);
948: }
1.9 christos 949:
950: /*! \file */
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