Annotation of src/lib/libc/resolv/res_init.c, Revision 1.32
1.32 ! christos 1: /* $NetBSD: res_init.c,v 1.31 2017/04/19 22:21:07 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
1.32 ! christos 75: __RCSID("$NetBSD: res_init.c,v 1.31 2017/04/19 22:21:07 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:
1.32 ! christos 193: static int
! 194: __res_kqinit(res_state statp)
! 195: {
! 196: struct kevent kc;
! 197: struct __res_state_ext *ext = statp->_u._ext.ext;
! 198:
! 199: ext->kq = kqueue1(O_CLOEXEC);
! 200: ext->kqpid = getpid();
! 201: EV_SET(&kc, ext->resfd, EVFILT_VNODE,
! 202: EV_ADD|EV_ENABLE|EV_CLEAR, NOTE_DELETE|NOTE_WRITE| NOTE_EXTEND|
! 203: NOTE_ATTRIB|NOTE_LINK|NOTE_RENAME|NOTE_REVOKE, 0, 0);
! 204: (void)kevent(ext->kq, &kc, 1, NULL, 0, &ts);
! 205: return ext->kq;
! 206: }
! 207:
1.9 christos 208: /*% This function has to be reachable by res_data.c but not publically. */
1.1 christos 209: int
210: __res_vinit(res_state statp, int preinit) {
211: register FILE *fp;
212: register char *cp, **pp;
213: register int n;
214: char buf[BUFSIZ];
1.9 christos 215: int nserv = 0; /*%< number of nameserver records read from file */
1.1 christos 216: int haveenv = 0;
217: int havesearch = 0;
1.14 christos 218: #ifdef RESOLVSORT
1.1 christos 219: int nsort = 0;
220: char *net;
1.14 christos 221: #endif
1.1 christos 222: int dots;
223: union res_sockaddr_union u[2];
1.14 christos 224: int maxns = MAXNS;
225:
226: RES_SET_H_ERRNO(statp, 0);
227:
1.21 christos 228: if ((statp->options & RES_INIT) != 0U)
229: res_ndestroy(statp);
230:
1.1 christos 231: if (!preinit) {
232: statp->retrans = RES_TIMEOUT;
233: statp->retry = RES_DFLRETRY;
234: statp->options = RES_DEFAULT;
235: }
1.21 christos 236: statp->_rnd = malloc(16);
237: res_rndinit(statp);
238: statp->id = res_nrandomid(statp);
1.12 christos 239:
1.1 christos 240: memset(u, 0, sizeof(u));
241: #ifdef USELOOPBACK
242: u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
243: #else
244: u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
245: #endif
246: u[nserv].sin.sin_family = AF_INET;
247: u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
248: #ifdef HAVE_SA_LEN
249: u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
250: #endif
251: nserv++;
252: #ifdef HAS_INET6_STRUCTS
253: #ifdef USELOOPBACK
254: u[nserv].sin6.sin6_addr = in6addr_loopback;
255: #else
256: u[nserv].sin6.sin6_addr = in6addr_any;
257: #endif
258: u[nserv].sin6.sin6_family = AF_INET6;
259: u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
260: #ifdef HAVE_SA_LEN
261: u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
262: #endif
263: nserv++;
264: #endif
265: statp->nscount = 0;
266: statp->ndots = 1;
267: statp->pfcode = 0;
268: statp->_vcsock = -1;
269: statp->_flags = 0;
270: statp->qhook = NULL;
271: statp->rhook = NULL;
272: statp->_u._ext.nscount = 0;
273: statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
274: if (statp->_u._ext.ext != NULL) {
275: memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
276: statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
277: strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
278: strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14 christos 279: } else {
280: /*
281: * Historically res_init() rarely, if at all, failed.
282: * Examples and applications exist which do not check
283: * our return code. Furthermore several applications
284: * simply call us to get the systems domainname. So
1.27 wiz 285: * rather than immediately fail here we store the
1.14 christos 286: * failure, which is returned later, in h_errno. And
287: * prevent the collection of 'nameserver' information
288: * by setting maxns to 0. Thus applications that fail
289: * to check our return code wont be able to make
290: * queries anyhow.
291: */
292: RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
293: maxns = 0;
294: }
295: #ifdef RESOLVSORT
1.1 christos 296: statp->nsort = 0;
1.14 christos 297: #endif
1.1 christos 298: res_setservers(statp, u, nserv);
299:
1.9 christos 300: #ifdef SOLARIS2
301: /*
302: * The old libresolv derived the defaultdomain from NIS/NIS+.
303: * We want to keep this behaviour
304: */
305: {
306: char buf[sizeof(statp->defdname)], *cp;
307: int ret;
308:
309: if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
310: (unsigned int)ret <= sizeof(buf)) {
311: if (buf[0] == '+')
312: buf[0] = '.';
313: cp = strchr(buf, '.');
314: cp = (cp == NULL) ? buf : (cp + 1);
1.14 christos 315: (void)strlcpy(statp->defdname, cp,
316: sizeof(statp->defdname));
1.9 christos 317: }
318: }
319: #endif /* SOLARIS2 */
320:
1.1 christos 321: /* Allow user to override the local domain definition */
322: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
323: (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
324: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
325: haveenv++;
326:
327: /*
328: * Set search list to be blank-separated strings
329: * from rest of env value. Permits users of LOCALDOMAIN
330: * to still have a search list, and anyone to set the
331: * one that they want to use as an individual (even more
332: * important now that the rfc1535 stuff restricts searches)
333: */
334: cp = statp->defdname;
335: pp = statp->dnsrch;
336: *pp++ = cp;
337: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9 christos 338: if (*cp == '\n') /*%< silly backwards compat */
1.1 christos 339: break;
340: else if (*cp == ' ' || *cp == '\t') {
341: *cp = 0;
342: n = 1;
343: } else if (n) {
344: *pp++ = cp;
345: n = 0;
346: havesearch = 1;
347: }
348: }
349: /* null terminate last domain if there are excess */
350: while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
351: cp++;
352: *cp = '\0';
353: *pp++ = 0;
354: }
355:
356: #define MATCH(line, name) \
357: (!strncmp(line, name, sizeof(name) - 1) && \
358: (line[sizeof(name) - 1] == ' ' || \
359: line[sizeof(name) - 1] == '\t'))
360:
361: nserv = 0;
1.28 christos 362: if ((fp = fopen(__res_conf_name, "re")) != NULL) {
1.21 christos 363: struct stat st;
364:
1.1 christos 365: /* read the config file */
1.24 christos 366: while (fgets(buf, (int)sizeof(buf), fp) != NULL) {
1.1 christos 367: /* skip comments */
368: if (*buf == ';' || *buf == '#')
369: continue;
370: /* read default domain name */
371: if (MATCH(buf, "domain")) {
1.9 christos 372: if (haveenv) /*%< skip if have from environ */
1.1 christos 373: continue;
374: cp = buf + sizeof("domain") - 1;
375: while (*cp == ' ' || *cp == '\t')
376: cp++;
377: if ((*cp == '\0') || (*cp == '\n'))
378: continue;
379: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
380: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
381: if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
382: *cp = '\0';
383: havesearch = 0;
384: continue;
385: }
386: /* set search list */
387: if (MATCH(buf, "search")) {
1.9 christos 388: if (haveenv) /*%< skip if have from environ */
1.1 christos 389: continue;
390: cp = buf + sizeof("search") - 1;
391: while (*cp == ' ' || *cp == '\t')
392: cp++;
393: if ((*cp == '\0') || (*cp == '\n'))
394: continue;
395: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
396: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
397: if ((cp = strchr(statp->defdname, '\n')) != NULL)
398: *cp = '\0';
399: /*
400: * Set search list to be blank-separated strings
401: * on rest of line.
402: */
403: cp = statp->defdname;
404: pp = statp->dnsrch;
405: *pp++ = cp;
406: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
407: if (*cp == ' ' || *cp == '\t') {
408: *cp = 0;
409: n = 1;
410: } else if (n) {
411: *pp++ = cp;
412: n = 0;
413: }
414: }
415: /* null terminate last domain if there are excess */
416: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
417: cp++;
418: *cp = '\0';
419: *pp++ = 0;
420: havesearch = 1;
421: continue;
422: }
423: /* read nameservers to query */
1.14 christos 424: if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1 christos 425: struct addrinfo hints, *ai;
426: char sbuf[NI_MAXSERV];
427: const size_t minsiz =
428: sizeof(statp->_u._ext.ext->nsaddrs[0]);
429:
430: cp = buf + sizeof("nameserver") - 1;
431: while (*cp == ' ' || *cp == '\t')
432: cp++;
433: cp[strcspn(cp, ";# \t\n")] = '\0';
434: if ((*cp != '\0') && (*cp != '\n')) {
435: memset(&hints, 0, sizeof(hints));
436: hints.ai_family = PF_UNSPEC;
437: hints.ai_socktype = SOCK_DGRAM; /*dummy*/
438: hints.ai_flags = AI_NUMERICHOST;
439: sprintf(sbuf, "%u", NAMESERVER_PORT);
440: if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
441: ai->ai_addrlen <= minsiz) {
442: if (statp->_u._ext.ext != NULL) {
443: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
444: ai->ai_addr, ai->ai_addrlen);
445: }
446: if (ai->ai_addrlen <=
447: sizeof(statp->nsaddr_list[nserv])) {
448: memcpy(&statp->nsaddr_list[nserv],
449: ai->ai_addr, ai->ai_addrlen);
450: } else
451: statp->nsaddr_list[nserv].sin_family = 0;
452: freeaddrinfo(ai);
453: nserv++;
454: }
455: }
456: continue;
457: }
1.14 christos 458: #ifdef RESOLVSORT
1.1 christos 459: if (MATCH(buf, "sortlist")) {
460: struct in_addr a;
461:
462: cp = buf + sizeof("sortlist") - 1;
463: while (nsort < MAXRESOLVSORT) {
464: while (*cp == ' ' || *cp == '\t')
465: cp++;
466: if (*cp == '\0' || *cp == '\n' || *cp == ';')
467: break;
468: net = cp;
469: while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
470: isascii(*cp) && !isspace((unsigned char)*cp))
471: cp++;
472: n = *cp;
473: *cp = 0;
474: if (inet_aton(net, &a)) {
475: statp->sort_list[nsort].addr = a;
476: if (ISSORTMASK(n)) {
477: *cp++ = n;
478: net = cp;
479: while (*cp && *cp != ';' &&
480: isascii(*cp) &&
481: !isspace((unsigned char)*cp))
482: cp++;
483: n = *cp;
484: *cp = 0;
485: if (inet_aton(net, &a)) {
486: statp->sort_list[nsort].mask = a.s_addr;
487: } else {
488: statp->sort_list[nsort].mask =
489: net_mask(statp->sort_list[nsort].addr);
490: }
491: } else {
492: statp->sort_list[nsort].mask =
493: net_mask(statp->sort_list[nsort].addr);
494: }
495: nsort++;
496: }
497: *cp = n;
498: }
499: continue;
500: }
1.14 christos 501: #endif
1.1 christos 502: if (MATCH(buf, "options")) {
503: res_setoptions(statp, buf + sizeof("options") - 1, "conf");
504: continue;
505: }
506: }
507: if (nserv > 0)
508: statp->nscount = nserv;
1.14 christos 509: #ifdef RESOLVSORT
1.1 christos 510: statp->nsort = nsort;
1.14 christos 511: #endif
1.31 christos 512: statp->_u._ext.ext->resfd = fcntl(fileno(fp), F_DUPFD_CLOEXEC, 0);
1.1 christos 513: (void) fclose(fp);
1.21 christos 514: if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
515: __res_conf_time = statp->_u._ext.ext->res_conf_time =
516: st.st_mtimespec;
1.32 ! christos 517: __res_kqinit(statp);
1.21 christos 518: } else {
519: statp->_u._ext.ext->kq = -1;
520: statp->_u._ext.ext->resfd = -1;
1.1 christos 521: }
522: /*
523: * Last chance to get a nameserver. This should not normally
524: * be necessary
525: */
526: #ifdef NO_RESOLV_CONF
527: if(nserv == 0)
528: nserv = get_nameservers(statp);
529: #endif
530:
531: if (statp->defdname[0] == 0 &&
532: gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
533: (cp = strchr(buf, '.')) != NULL)
534: strcpy(statp->defdname, cp + 1);
535:
536: /* find components of local domain that might be searched */
537: if (havesearch == 0) {
538: pp = statp->dnsrch;
539: *pp++ = statp->defdname;
540: *pp = NULL;
541:
542: dots = 0;
543: for (cp = statp->defdname; *cp; cp++)
544: dots += (*cp == '.');
545:
546: cp = statp->defdname;
547: while (pp < statp->dnsrch + MAXDFLSRCH) {
548: if (dots < LOCALDOMAINPARTS)
549: break;
1.9 christos 550: cp = strchr(cp, '.') + 1; /*%< we know there is one */
1.1 christos 551: *pp++ = cp;
552: dots--;
553: }
554: *pp = NULL;
555: #ifdef DEBUG
556: if (statp->options & RES_DEBUG) {
557: printf(";; res_init()... default dnsrch list:\n");
558: for (pp = statp->dnsrch; *pp; pp++)
559: printf(";;\t%s\n", *pp);
560: printf(";;\t..END..\n");
561: }
562: #endif
563: }
564:
565: if ((cp = getenv("RES_OPTIONS")) != NULL)
566: res_setoptions(statp, cp, "env");
567: statp->options |= RES_INIT;
1.14 christos 568: return (statp->res_h_errno);
1.1 christos 569: }
570:
1.22 christos 571: int
572: res_check(res_state statp, struct timespec *mtime)
1.21 christos 573: {
574: /*
575: * If the times are equal, then we check if there
576: * was a kevent related to resolv.conf and reload.
577: * If the times are not equal, then we don't bother
578: * to check the kevent, because another thread already
579: * did, loaded and changed the time.
580: */
581: if (timespeccmp(&statp->_u._ext.ext->res_conf_time,
582: &__res_conf_time, ==)) {
583: struct kevent ke;
584: if (statp->_u._ext.ext->kq == -1)
1.22 christos 585: goto out;
1.32 ! christos 586: if (statp->_u._ext.ext->kqpid != getpid() &&
! 587: __res_kqinit(statp) == -1)
! 588: goto out;
1.21 christos 589:
590: switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
591: case 0:
592: case -1:
1.22 christos 593: out:
594: if (mtime)
595: *mtime = __res_conf_time;
596: return 0;
1.21 christos 597: default:
598: break;
599: }
600: }
601: (void)__res_vinit(statp, 0);
1.22 christos 602: if (mtime)
603: *mtime = __res_conf_time;
604: return 1;
1.21 christos 605: }
606:
1.1 christos 607: static void
608: res_setoptions(res_state statp, const char *options, const char *source)
609: {
610: const char *cp = options;
611: int i;
1.24 christos 612: size_t j;
1.1 christos 613: struct __res_state_ext *ext = statp->_u._ext.ext;
614:
615: #ifdef DEBUG
616: if (statp->options & RES_DEBUG)
617: printf(";; res_setoptions(\"%s\", \"%s\")...\n",
618: options, source);
619: #endif
620: while (*cp) {
621: /* skip leading and inner runs of spaces */
622: while (*cp == ' ' || *cp == '\t')
623: cp++;
624: /* search for and process individual options */
625: if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
626: i = atoi(cp + sizeof("ndots:") - 1);
627: if (i <= RES_MAXNDOTS)
628: statp->ndots = i;
629: else
630: statp->ndots = RES_MAXNDOTS;
631: #ifdef DEBUG
632: if (statp->options & RES_DEBUG)
633: printf(";;\tndots=%d\n", statp->ndots);
634: #endif
635: } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
636: i = atoi(cp + sizeof("timeout:") - 1);
637: if (i <= RES_MAXRETRANS)
638: statp->retrans = i;
639: else
640: statp->retrans = RES_MAXRETRANS;
641: #ifdef DEBUG
642: if (statp->options & RES_DEBUG)
643: printf(";;\ttimeout=%d\n", statp->retrans);
644: #endif
1.9 christos 645: #ifdef SOLARIS2
646: } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
647: /*
648: * For backward compatibility, 'retrans' is
649: * supported as an alias for 'timeout', though
650: * without an imposed maximum.
651: */
652: statp->retrans = atoi(cp + sizeof("retrans:") - 1);
653: } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
654: /*
655: * For backward compatibility, 'retry' is
656: * supported as an alias for 'attempts', though
657: * without an imposed maximum.
658: */
659: statp->retry = atoi(cp + sizeof("retry:") - 1);
660: #endif /* SOLARIS2 */
1.1 christos 661: } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
662: i = atoi(cp + sizeof("attempts:") - 1);
663: if (i <= RES_MAXRETRY)
664: statp->retry = i;
665: else
666: statp->retry = RES_MAXRETRY;
667: #ifdef DEBUG
668: if (statp->options & RES_DEBUG)
669: printf(";;\tattempts=%d\n", statp->retry);
670: #endif
671: } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
672: #ifdef DEBUG
673: if (!(statp->options & RES_DEBUG)) {
674: printf(";; res_setoptions(\"%s\", \"%s\")..\n",
675: options, source);
676: statp->options |= RES_DEBUG;
677: }
678: printf(";;\tdebug\n");
679: #endif
680: } else if (!strncmp(cp, "no_tld_query",
681: sizeof("no_tld_query") - 1) ||
682: !strncmp(cp, "no-tld-query",
683: sizeof("no-tld-query") - 1)) {
684: statp->options |= RES_NOTLDQUERY;
685: } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
686: statp->options |= RES_USE_INET6;
687: } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
688: statp->options |= RES_ROTATE;
689: } else if (!strncmp(cp, "no-check-names",
690: sizeof("no-check-names") - 1)) {
691: statp->options |= RES_NOCHECKNAME;
1.26 christos 692: } else if (!strncmp(cp, "check-names",
693: sizeof("check-names") - 1)) {
694: statp->options &= ~RES_NOCHECKNAME;
1.1 christos 695: }
696: #ifdef RES_USE_EDNS0
697: else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
698: statp->options |= RES_USE_EDNS0;
699: }
700: #endif
701: else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
702: statp->options |= RES_USE_DNAME;
703: }
704: else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
705: if (ext == NULL)
706: goto skip;
707: cp += sizeof("nibble:") - 1;
1.24 christos 708: j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
709: strncpy(ext->nsuffix, cp, j);
710: ext->nsuffix[j] = '\0';
1.1 christos 711: }
712: else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
713: if (ext == NULL)
714: goto skip;
715: cp += sizeof("nibble2:") - 1;
1.24 christos 716: j = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
717: strncpy(ext->nsuffix2, cp, j);
718: ext->nsuffix2[j] = '\0';
1.1 christos 719: }
720: else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
721: cp += sizeof("v6revmode:") - 1;
722: /* "nibble" and "bitstring" used to be valid */
723: if (!strncmp(cp, "single", sizeof("single") - 1)) {
724: statp->options |= RES_NO_NIBBLE2;
725: } else if (!strncmp(cp, "both", sizeof("both") - 1)) {
726: statp->options &=
727: ~RES_NO_NIBBLE2;
728: }
729: }
730: else {
731: /* XXX - print a warning here? */
732: }
733: skip:
734: /* skip to next run of spaces */
735: while (*cp && *cp != ' ' && *cp != '\t')
736: cp++;
737: }
738: }
739:
1.14 christos 740: #ifdef RESOLVSORT
1.1 christos 741: /* XXX - should really support CIDR which means explicit masks always. */
1.25 matt 742: static uint32_t
743: net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
1.1 christos 744: {
1.25 matt 745: register uint32_t i = ntohl(in.s_addr);
1.1 christos 746:
747: if (IN_CLASSA(i))
748: return (htonl(IN_CLASSA_NET));
749: else if (IN_CLASSB(i))
750: return (htonl(IN_CLASSB_NET));
751: return (htonl(IN_CLASSC_NET));
752: }
1.14 christos 753: #endif
1.1 christos 754:
1.20 christos 755: static u_char srnd[16];
756:
1.17 christos 757: void
758: res_rndinit(res_state statp)
759: {
760: struct timeval now;
1.25 matt 761: uint32_t u32;
762: uint16_t u16;
1.20 christos 763: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.17 christos 764:
765: gettimeofday(&now, NULL);
1.25 matt 766: u32 = (uint32_t)now.tv_sec;
1.20 christos 767: memcpy(rnd, &u32, 4);
1.17 christos 768: u32 = now.tv_usec;
1.20 christos 769: memcpy(rnd + 4, &u32, 4);
1.25 matt 770: u32 += (uint32_t)now.tv_sec;
1.20 christos 771: memcpy(rnd + 8, &u32, 4);
1.17 christos 772: u16 = getpid();
1.20 christos 773: memcpy(rnd + 12, &u16, 2);
1.17 christos 774: }
775:
1.1 christos 776: u_int
1.25 matt 777: res_nrandomid(res_state statp)
778: {
1.1 christos 779: struct timeval now;
1.25 matt 780: uint16_t u16;
1.17 christos 781: MD5_CTX ctx;
1.20 christos 782: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1 christos 783:
784: gettimeofday(&now, NULL);
1.25 matt 785: u16 = (uint16_t) (now.tv_sec ^ now.tv_usec);
1.20 christos 786: memcpy(rnd + 14, &u16, 2);
1.17 christos 787: #ifndef HAVE_MD5
788: MD5_Init(&ctx);
1.20 christos 789: MD5_Update(&ctx, rnd, 16);
790: MD5_Final(rnd, &ctx);
1.17 christos 791: #else
792: MD5Init(&ctx);
1.20 christos 793: MD5Update(&ctx, rnd, 16);
794: MD5Final(rnd, &ctx);
1.17 christos 795: #endif
1.20 christos 796: memcpy(&u16, rnd + 14, 2);
1.17 christos 797: return ((u_int) u16);
1.1 christos 798: }
799:
1.9 christos 800: /*%
1.1 christos 801: * This routine is for closing the socket if a virtual circuit is used and
802: * the program wants to close it. This provides support for endhostent()
803: * which expects to close the socket.
804: *
805: * This routine is not expected to be user visible.
806: */
807: void
1.25 matt 808: res_nclose(res_state statp)
809: {
1.1 christos 810: int ns;
811:
812: if (statp->_vcsock >= 0) {
813: (void) close(statp->_vcsock);
814: statp->_vcsock = -1;
815: statp->_flags &= ~(RES_F_VC | RES_F_CONN);
816: }
817: for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
818: if (statp->_u._ext.nssocks[ns] != -1) {
819: (void) close(statp->_u._ext.nssocks[ns]);
820: statp->_u._ext.nssocks[ns] = -1;
821: }
822: }
823: }
824:
825: void
1.25 matt 826: res_ndestroy(res_state statp)
827: {
1.32 ! christos 828: struct __res_state_ext *ext = statp->_u._ext.ext;
1.1 christos 829: res_nclose(statp);
1.32 ! christos 830: if (ext != NULL) {
! 831: if (ext->kq != -1 && ext->kqpid == getpid())
! 832: (void)close(ext->kq);
! 833: if (ext->resfd != -1)
! 834: (void)close(ext->resfd);
! 835: free(ext);
1.20 christos 836: statp->_u._ext.ext = NULL;
837: }
838: if (statp->_rnd != NULL) {
839: free(statp->_rnd);
840: statp->_rnd = NULL;
841: }
1.1 christos 842: statp->options &= ~RES_INIT;
843: }
844:
845: const char *
1.25 matt 846: res_get_nibblesuffix(res_state statp)
847: {
1.1 christos 848: if (statp->_u._ext.ext)
849: return (statp->_u._ext.ext->nsuffix);
850: return ("ip6.arpa");
851: }
852:
853: const char *
1.25 matt 854: res_get_nibblesuffix2(res_state statp)
855: {
1.1 christos 856: if (statp->_u._ext.ext)
857: return (statp->_u._ext.ext->nsuffix2);
858: return ("ip6.int");
859: }
860:
861: void
1.25 matt 862: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt)
863: {
1.1 christos 864: int i, nserv;
865: size_t size;
866:
867: /* close open servers */
868: res_nclose(statp);
869:
870: /* cause rtt times to be forgotten */
871: statp->_u._ext.nscount = 0;
872:
873: nserv = 0;
874: for (i = 0; i < cnt && nserv < MAXNS; i++) {
875: switch (set->sin.sin_family) {
876: case AF_INET:
877: size = sizeof(set->sin);
878: if (statp->_u._ext.ext)
879: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
880: &set->sin, size);
881: if (size <= sizeof(statp->nsaddr_list[nserv]))
882: memcpy(&statp->nsaddr_list[nserv],
883: &set->sin, size);
884: else
885: statp->nsaddr_list[nserv].sin_family = 0;
886: nserv++;
887: break;
888:
889: #ifdef HAS_INET6_STRUCTS
890: case AF_INET6:
891: size = sizeof(set->sin6);
892: if (statp->_u._ext.ext)
893: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
894: &set->sin6, size);
895: if (size <= sizeof(statp->nsaddr_list[nserv]))
896: memcpy(&statp->nsaddr_list[nserv],
897: &set->sin6, size);
898: else
899: statp->nsaddr_list[nserv].sin_family = 0;
900: nserv++;
901: break;
902: #endif
903:
904: default:
905: break;
906: }
907: set++;
908: }
909: statp->nscount = nserv;
910:
911: }
912:
913: int
1.25 matt 914: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt)
915: {
1.1 christos 916: int i;
917: size_t size;
1.25 matt 918: uint16_t family;
1.1 christos 919:
920: for (i = 0; i < statp->nscount && i < cnt; i++) {
921: if (statp->_u._ext.ext)
922: family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
923: else
924: family = statp->nsaddr_list[i].sin_family;
925:
926: switch (family) {
927: case AF_INET:
928: size = sizeof(set->sin);
929: if (statp->_u._ext.ext)
930: memcpy(&set->sin,
931: &statp->_u._ext.ext->nsaddrs[i],
932: size);
933: else
934: memcpy(&set->sin, &statp->nsaddr_list[i],
935: size);
936: break;
937:
938: #ifdef HAS_INET6_STRUCTS
939: case AF_INET6:
940: size = sizeof(set->sin6);
941: if (statp->_u._ext.ext)
942: memcpy(&set->sin6,
943: &statp->_u._ext.ext->nsaddrs[i],
944: size);
945: else
946: memcpy(&set->sin6, &statp->nsaddr_list[i],
947: size);
948: break;
949: #endif
950:
951: default:
952: set->sin.sin_family = 0;
953: break;
954: }
955: set++;
956: }
957: return (statp->nscount);
958: }
1.9 christos 959:
960: /*! \file */
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