Annotation of src/lib/libc/resolv/res_init.c, Revision 1.15.12.1
1.15.12.1! riz 1: /* $NetBSD: res_init.c,v 1.22 2009/10/24 17:24:01 christos Exp $ */
1.1 christos 2:
3: /*
4: * Copyright (c) 1985, 1989, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: /*
37: * Portions Copyright (c) 1993 by Digital Equipment Corporation.
38: *
39: * Permission to use, copy, modify, and distribute this software for any
40: * purpose with or without fee is hereby granted, provided that the above
41: * copyright notice and this permission notice appear in all copies, and that
42: * the name of Digital Equipment Corporation not be used in advertising or
43: * publicity pertaining to distribution of the document or software without
44: * specific, written prior permission.
45: *
46: * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
47: * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
48: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
49: * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
50: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
51: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
52: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
53: * SOFTWARE.
54: */
55:
56: /*
57: * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
58: * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
59: *
60: * Permission to use, copy, modify, and distribute this software for any
61: * purpose with or without fee is hereby granted, provided that the above
62: * copyright notice and this permission notice appear in all copies.
63: *
64: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
65: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
66: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
67: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
68: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
69: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
70: * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
71: */
72:
1.3 christos 73: #include <sys/cdefs.h>
1.1 christos 74: #if defined(LIBC_SCCS) && !defined(lint)
1.3 christos 75: #ifdef notdef
1.1 christos 76: static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
1.15.12.1! riz 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
1.15.12.1! riz 79: __RCSID("$NetBSD: res_init.c,v 1.22 2009/10/24 17:24:01 christos Exp $");
1.3 christos 80: #endif
1.1 christos 81: #endif /* LIBC_SCCS and not lint */
82:
83: #include "port_before.h"
84:
1.4 christos 85: #include "namespace.h"
1.1 christos 86: #include <sys/types.h>
87: #include <sys/param.h>
88: #include <sys/socket.h>
1.15.12.1! riz 89: #include <sys/stat.h>
1.1 christos 90: #include <sys/time.h>
1.15.12.1! riz 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>
1.15.12.1! riz 102: #include <fcntl.h>
1.1 christos 103: #include <netdb.h>
104:
1.15.12.1! riz 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:
1.1 christos 150: static void res_setoptions __P((res_state, const char *, const char *));
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)
155: static u_int32_t net_mask __P((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:
1.15.12.1! riz 162: static struct timespec __res_conf_time;
! 163: static const struct timespec ts = { 0, 0 };
! 164:
1.1 christos 165: /*
166: * Resolver state default settings.
167: */
168:
1.9 christos 169: /*%
1.1 christos 170: * Set up default settings. If the configuration file exist, the values
171: * there will have precedence. Otherwise, the server address is set to
172: * INADDR_ANY and the default domain name comes from the gethostname().
173: *
174: * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
175: * rather than INADDR_ANY ("0.0.0.0") as the default name server address
176: * since it was noted that INADDR_ANY actually meant ``the first interface
177: * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
178: * it had to be "up" in order for you to reach your own name server. It
179: * was later decided that since the recommended practice is to always
180: * install local static routes through 127.0.0.1 for all your network
181: * interfaces, that we could solve this problem without a code change.
182: *
183: * The configuration file should always be used, since it is the only way
184: * to specify a default domain. If you are running a server on your local
185: * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
186: * in the configuration file.
187: *
188: * Return 0 if completes successfully, -1 on error
189: */
190: int
191: res_ninit(res_state statp) {
192: return (__res_vinit(statp, 0));
193: }
194:
1.9 christos 195: /*% This function has to be reachable by res_data.c but not publically. */
1.1 christos 196: int
197: __res_vinit(res_state statp, int preinit) {
198: register FILE *fp;
199: register char *cp, **pp;
200: register int n;
201: char buf[BUFSIZ];
1.9 christos 202: int nserv = 0; /*%< number of nameserver records read from file */
1.1 christos 203: int haveenv = 0;
204: int havesearch = 0;
1.14 christos 205: #ifdef RESOLVSORT
1.1 christos 206: int nsort = 0;
207: char *net;
1.14 christos 208: #endif
1.1 christos 209: int dots;
210: union res_sockaddr_union u[2];
1.14 christos 211: int maxns = MAXNS;
212:
213: RES_SET_H_ERRNO(statp, 0);
214:
1.15.12.1! riz 215: if ((statp->options & RES_INIT) != 0U)
! 216: res_ndestroy(statp);
! 217:
1.1 christos 218: if (!preinit) {
219: statp->retrans = RES_TIMEOUT;
220: statp->retry = RES_DFLRETRY;
221: statp->options = RES_DEFAULT;
222: }
1.15.12.1! riz 223: statp->_rnd = malloc(16);
! 224: res_rndinit(statp);
! 225: statp->id = res_nrandomid(statp);
1.12 christos 226:
1.1 christos 227: memset(u, 0, sizeof(u));
228: #ifdef USELOOPBACK
229: u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
230: #else
231: u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
232: #endif
233: u[nserv].sin.sin_family = AF_INET;
234: u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
235: #ifdef HAVE_SA_LEN
236: u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
237: #endif
238: nserv++;
239: #ifdef HAS_INET6_STRUCTS
240: #ifdef USELOOPBACK
241: u[nserv].sin6.sin6_addr = in6addr_loopback;
242: #else
243: u[nserv].sin6.sin6_addr = in6addr_any;
244: #endif
245: u[nserv].sin6.sin6_family = AF_INET6;
246: u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
247: #ifdef HAVE_SA_LEN
248: u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
249: #endif
250: nserv++;
251: #endif
252: statp->nscount = 0;
253: statp->ndots = 1;
254: statp->pfcode = 0;
255: statp->_vcsock = -1;
256: statp->_flags = 0;
257: statp->qhook = NULL;
258: statp->rhook = NULL;
259: statp->_u._ext.nscount = 0;
260: statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
261: if (statp->_u._ext.ext != NULL) {
262: memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
263: statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
264: strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
265: strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
1.14 christos 266: } else {
267: /*
268: * Historically res_init() rarely, if at all, failed.
269: * Examples and applications exist which do not check
270: * our return code. Furthermore several applications
271: * simply call us to get the systems domainname. So
272: * rather then immediately fail here we store the
273: * failure, which is returned later, in h_errno. And
274: * prevent the collection of 'nameserver' information
275: * by setting maxns to 0. Thus applications that fail
276: * to check our return code wont be able to make
277: * queries anyhow.
278: */
279: RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
280: maxns = 0;
281: }
282: #ifdef RESOLVSORT
1.1 christos 283: statp->nsort = 0;
1.14 christos 284: #endif
1.1 christos 285: res_setservers(statp, u, nserv);
286:
1.9 christos 287: #ifdef SOLARIS2
288: /*
289: * The old libresolv derived the defaultdomain from NIS/NIS+.
290: * We want to keep this behaviour
291: */
292: {
293: char buf[sizeof(statp->defdname)], *cp;
294: int ret;
295:
296: if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
297: (unsigned int)ret <= sizeof(buf)) {
298: if (buf[0] == '+')
299: buf[0] = '.';
300: cp = strchr(buf, '.');
301: cp = (cp == NULL) ? buf : (cp + 1);
1.14 christos 302: (void)strlcpy(statp->defdname, cp,
303: sizeof(statp->defdname));
1.9 christos 304: }
305: }
306: #endif /* SOLARIS2 */
307:
1.1 christos 308: /* Allow user to override the local domain definition */
309: if ((cp = getenv("LOCALDOMAIN")) != NULL) {
310: (void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
311: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
312: haveenv++;
313:
314: /*
315: * Set search list to be blank-separated strings
316: * from rest of env value. Permits users of LOCALDOMAIN
317: * to still have a search list, and anyone to set the
318: * one that they want to use as an individual (even more
319: * important now that the rfc1535 stuff restricts searches)
320: */
321: cp = statp->defdname;
322: pp = statp->dnsrch;
323: *pp++ = cp;
324: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
1.9 christos 325: if (*cp == '\n') /*%< silly backwards compat */
1.1 christos 326: break;
327: else if (*cp == ' ' || *cp == '\t') {
328: *cp = 0;
329: n = 1;
330: } else if (n) {
331: *pp++ = cp;
332: n = 0;
333: havesearch = 1;
334: }
335: }
336: /* null terminate last domain if there are excess */
337: while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
338: cp++;
339: *cp = '\0';
340: *pp++ = 0;
341: }
342:
343: #define MATCH(line, name) \
344: (!strncmp(line, name, sizeof(name) - 1) && \
345: (line[sizeof(name) - 1] == ' ' || \
346: line[sizeof(name) - 1] == '\t'))
347:
348: nserv = 0;
349: if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
1.15.12.1! riz 350: struct stat st;
! 351: struct kevent kc;
! 352:
1.1 christos 353: /* read the config file */
354: while (fgets(buf, sizeof(buf), fp) != NULL) {
355: /* skip comments */
356: if (*buf == ';' || *buf == '#')
357: continue;
358: /* read default domain name */
359: if (MATCH(buf, "domain")) {
1.9 christos 360: if (haveenv) /*%< skip if have from environ */
1.1 christos 361: continue;
362: cp = buf + sizeof("domain") - 1;
363: while (*cp == ' ' || *cp == '\t')
364: cp++;
365: if ((*cp == '\0') || (*cp == '\n'))
366: continue;
367: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
368: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
369: if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
370: *cp = '\0';
371: havesearch = 0;
372: continue;
373: }
374: /* set search list */
375: if (MATCH(buf, "search")) {
1.9 christos 376: if (haveenv) /*%< skip if have from environ */
1.1 christos 377: continue;
378: cp = buf + sizeof("search") - 1;
379: while (*cp == ' ' || *cp == '\t')
380: cp++;
381: if ((*cp == '\0') || (*cp == '\n'))
382: continue;
383: strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
384: statp->defdname[sizeof(statp->defdname) - 1] = '\0';
385: if ((cp = strchr(statp->defdname, '\n')) != NULL)
386: *cp = '\0';
387: /*
388: * Set search list to be blank-separated strings
389: * on rest of line.
390: */
391: cp = statp->defdname;
392: pp = statp->dnsrch;
393: *pp++ = cp;
394: for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
395: if (*cp == ' ' || *cp == '\t') {
396: *cp = 0;
397: n = 1;
398: } else if (n) {
399: *pp++ = cp;
400: n = 0;
401: }
402: }
403: /* null terminate last domain if there are excess */
404: while (*cp != '\0' && *cp != ' ' && *cp != '\t')
405: cp++;
406: *cp = '\0';
407: *pp++ = 0;
408: havesearch = 1;
409: continue;
410: }
411: /* read nameservers to query */
1.14 christos 412: if (MATCH(buf, "nameserver") && nserv < maxns) {
1.1 christos 413: struct addrinfo hints, *ai;
414: char sbuf[NI_MAXSERV];
415: const size_t minsiz =
416: sizeof(statp->_u._ext.ext->nsaddrs[0]);
417:
418: cp = buf + sizeof("nameserver") - 1;
419: while (*cp == ' ' || *cp == '\t')
420: cp++;
421: cp[strcspn(cp, ";# \t\n")] = '\0';
422: if ((*cp != '\0') && (*cp != '\n')) {
423: memset(&hints, 0, sizeof(hints));
424: hints.ai_family = PF_UNSPEC;
425: hints.ai_socktype = SOCK_DGRAM; /*dummy*/
426: hints.ai_flags = AI_NUMERICHOST;
427: sprintf(sbuf, "%u", NAMESERVER_PORT);
428: if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
429: ai->ai_addrlen <= minsiz) {
430: if (statp->_u._ext.ext != NULL) {
431: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
432: ai->ai_addr, ai->ai_addrlen);
433: }
434: if (ai->ai_addrlen <=
435: sizeof(statp->nsaddr_list[nserv])) {
436: memcpy(&statp->nsaddr_list[nserv],
437: ai->ai_addr, ai->ai_addrlen);
438: } else
439: statp->nsaddr_list[nserv].sin_family = 0;
440: freeaddrinfo(ai);
441: nserv++;
442: }
443: }
444: continue;
445: }
1.14 christos 446: #ifdef RESOLVSORT
1.1 christos 447: if (MATCH(buf, "sortlist")) {
448: struct in_addr a;
449:
450: cp = buf + sizeof("sortlist") - 1;
451: while (nsort < MAXRESOLVSORT) {
452: while (*cp == ' ' || *cp == '\t')
453: cp++;
454: if (*cp == '\0' || *cp == '\n' || *cp == ';')
455: break;
456: net = cp;
457: while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
458: isascii(*cp) && !isspace((unsigned char)*cp))
459: cp++;
460: n = *cp;
461: *cp = 0;
462: if (inet_aton(net, &a)) {
463: statp->sort_list[nsort].addr = a;
464: if (ISSORTMASK(n)) {
465: *cp++ = n;
466: net = cp;
467: while (*cp && *cp != ';' &&
468: isascii(*cp) &&
469: !isspace((unsigned char)*cp))
470: cp++;
471: n = *cp;
472: *cp = 0;
473: if (inet_aton(net, &a)) {
474: statp->sort_list[nsort].mask = a.s_addr;
475: } else {
476: statp->sort_list[nsort].mask =
477: net_mask(statp->sort_list[nsort].addr);
478: }
479: } else {
480: statp->sort_list[nsort].mask =
481: net_mask(statp->sort_list[nsort].addr);
482: }
483: nsort++;
484: }
485: *cp = n;
486: }
487: continue;
488: }
1.14 christos 489: #endif
1.1 christos 490: if (MATCH(buf, "options")) {
491: res_setoptions(statp, buf + sizeof("options") - 1, "conf");
492: continue;
493: }
494: }
495: if (nserv > 0)
496: statp->nscount = nserv;
1.14 christos 497: #ifdef RESOLVSORT
1.1 christos 498: statp->nsort = nsort;
1.14 christos 499: #endif
1.15.12.1! riz 500: statp->_u._ext.ext->resfd = dup(fileno(fp));
1.1 christos 501: (void) fclose(fp);
1.15.12.1! riz 502: if (fstat(statp->_u._ext.ext->resfd, &st) != -1)
! 503: __res_conf_time = statp->_u._ext.ext->res_conf_time =
! 504: st.st_mtimespec;
! 505: statp->_u._ext.ext->kq = kqueue();
! 506: (void)fcntl(statp->_u._ext.ext->kq, F_SETFD, FD_CLOEXEC);
! 507: (void)fcntl(statp->_u._ext.ext->resfd, F_SETFD, FD_CLOEXEC);
! 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:
1.15.12.1! riz 565: int
! 566: res_check(res_state statp, struct timespec *mtime)
! 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)
! 579: goto out;
! 580:
! 581: switch (kevent(statp->_u._ext.ext->kq, NULL, 0, &ke, 1, &ts)) {
! 582: case 0:
! 583: case -1:
! 584: out:
! 585: if (mtime)
! 586: *mtime = __res_conf_time;
! 587: return 0;
! 588: default:
! 589: break;
! 590: }
! 591: }
! 592: (void)__res_vinit(statp, 0);
! 593: if (mtime)
! 594: *mtime = __res_conf_time;
! 595: return 1;
! 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;
603: struct __res_state_ext *ext = statp->_u._ext.ext;
604:
605: #ifdef DEBUG
606: if (statp->options & RES_DEBUG)
607: printf(";; res_setoptions(\"%s\", \"%s\")...\n",
608: options, source);
609: #endif
610: while (*cp) {
611: /* skip leading and inner runs of spaces */
612: while (*cp == ' ' || *cp == '\t')
613: cp++;
614: /* search for and process individual options */
615: if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
616: i = atoi(cp + sizeof("ndots:") - 1);
617: if (i <= RES_MAXNDOTS)
618: statp->ndots = i;
619: else
620: statp->ndots = RES_MAXNDOTS;
621: #ifdef DEBUG
622: if (statp->options & RES_DEBUG)
623: printf(";;\tndots=%d\n", statp->ndots);
624: #endif
625: } else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
626: i = atoi(cp + sizeof("timeout:") - 1);
627: if (i <= RES_MAXRETRANS)
628: statp->retrans = i;
629: else
630: statp->retrans = RES_MAXRETRANS;
631: #ifdef DEBUG
632: if (statp->options & RES_DEBUG)
633: printf(";;\ttimeout=%d\n", statp->retrans);
634: #endif
1.9 christos 635: #ifdef SOLARIS2
636: } else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
637: /*
638: * For backward compatibility, 'retrans' is
639: * supported as an alias for 'timeout', though
640: * without an imposed maximum.
641: */
642: statp->retrans = atoi(cp + sizeof("retrans:") - 1);
643: } else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
644: /*
645: * For backward compatibility, 'retry' is
646: * supported as an alias for 'attempts', though
647: * without an imposed maximum.
648: */
649: statp->retry = atoi(cp + sizeof("retry:") - 1);
650: #endif /* SOLARIS2 */
1.1 christos 651: } else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
652: i = atoi(cp + sizeof("attempts:") - 1);
653: if (i <= RES_MAXRETRY)
654: statp->retry = i;
655: else
656: statp->retry = RES_MAXRETRY;
657: #ifdef DEBUG
658: if (statp->options & RES_DEBUG)
659: printf(";;\tattempts=%d\n", statp->retry);
660: #endif
661: } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
662: #ifdef DEBUG
663: if (!(statp->options & RES_DEBUG)) {
664: printf(";; res_setoptions(\"%s\", \"%s\")..\n",
665: options, source);
666: statp->options |= RES_DEBUG;
667: }
668: printf(";;\tdebug\n");
669: #endif
670: } else if (!strncmp(cp, "no_tld_query",
671: sizeof("no_tld_query") - 1) ||
672: !strncmp(cp, "no-tld-query",
673: sizeof("no-tld-query") - 1)) {
674: statp->options |= RES_NOTLDQUERY;
675: } else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
676: statp->options |= RES_USE_INET6;
677: } else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
678: statp->options |= RES_ROTATE;
679: } else if (!strncmp(cp, "no-check-names",
680: sizeof("no-check-names") - 1)) {
681: statp->options |= RES_NOCHECKNAME;
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;
695: i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
1.2 christos 696: strncpy(ext->nsuffix, cp, (size_t)i);
1.1 christos 697: ext->nsuffix[i] = '\0';
698: }
699: else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
700: if (ext == NULL)
701: goto skip;
702: cp += sizeof("nibble2:") - 1;
703: i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
1.2 christos 704: strncpy(ext->nsuffix2, cp, (size_t)i);
1.1 christos 705: ext->nsuffix2[i] = '\0';
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. */
729: static u_int32_t
1.9 christos 730: net_mask(in) /*!< XXX - should really use system's version of this */
1.1 christos 731: struct in_addr in;
732: {
733: register u_int32_t i = ntohl(in.s_addr);
734:
735: if (IN_CLASSA(i))
736: return (htonl(IN_CLASSA_NET));
737: else if (IN_CLASSB(i))
738: return (htonl(IN_CLASSB_NET));
739: return (htonl(IN_CLASSC_NET));
740: }
1.14 christos 741: #endif
1.1 christos 742:
1.15.12.1! riz 743: static u_char srnd[16];
! 744:
! 745: void
! 746: res_rndinit(res_state statp)
! 747: {
! 748: struct timeval now;
! 749: u_int32_t u32;
! 750: u_int16_t u16;
! 751: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
! 752:
! 753: gettimeofday(&now, NULL);
! 754: u32 = (u_int32_t)now.tv_sec;
! 755: memcpy(rnd, &u32, 4);
! 756: u32 = now.tv_usec;
! 757: memcpy(rnd + 4, &u32, 4);
! 758: u32 += (u_int32_t)now.tv_sec;
! 759: memcpy(rnd + 8, &u32, 4);
! 760: u16 = getpid();
! 761: memcpy(rnd + 12, &u16, 2);
! 762: }
! 763:
1.1 christos 764: u_int
1.15.12.1! riz 765: res_nrandomid(res_state statp) {
1.1 christos 766: struct timeval now;
1.15.12.1! riz 767: u_int16_t u16;
! 768: MD5_CTX ctx;
! 769: u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
1.1 christos 770:
771: gettimeofday(&now, NULL);
1.15.12.1! riz 772: u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
! 773: memcpy(rnd + 14, &u16, 2);
! 774: #ifndef HAVE_MD5
! 775: MD5_Init(&ctx);
! 776: MD5_Update(&ctx, rnd, 16);
! 777: MD5_Final(rnd, &ctx);
! 778: #else
! 779: MD5Init(&ctx);
! 780: MD5Update(&ctx, rnd, 16);
! 781: MD5Final(rnd, &ctx);
! 782: #endif
! 783: memcpy(&u16, rnd + 14, 2);
! 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
795: res_nclose(res_state statp) {
796: int ns;
797:
798: if (statp->_vcsock >= 0) {
799: (void) close(statp->_vcsock);
800: statp->_vcsock = -1;
801: statp->_flags &= ~(RES_F_VC | RES_F_CONN);
802: }
803: for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
804: if (statp->_u._ext.nssocks[ns] != -1) {
805: (void) close(statp->_u._ext.nssocks[ns]);
806: statp->_u._ext.nssocks[ns] = -1;
807: }
808: }
809: }
810:
811: void
812: res_ndestroy(res_state statp) {
813: res_nclose(statp);
1.15.12.1! riz 814: if (statp->_u._ext.ext != NULL) {
! 815: if (statp->_u._ext.ext->kq != -1)
! 816: (void)close(statp->_u._ext.ext->kq);
! 817: if (statp->_u._ext.ext->resfd != -1)
! 818: (void)close(statp->_u._ext.ext->resfd);
1.1 christos 819: free(statp->_u._ext.ext);
1.15.12.1! riz 820: statp->_u._ext.ext = NULL;
! 821: }
! 822: if (statp->_rnd != NULL) {
! 823: free(statp->_rnd);
! 824: statp->_rnd = NULL;
! 825: }
1.1 christos 826: statp->options &= ~RES_INIT;
827: }
828:
829: const char *
830: res_get_nibblesuffix(res_state statp) {
831: if (statp->_u._ext.ext)
832: return (statp->_u._ext.ext->nsuffix);
833: return ("ip6.arpa");
834: }
835:
836: const char *
837: res_get_nibblesuffix2(res_state statp) {
838: if (statp->_u._ext.ext)
839: return (statp->_u._ext.ext->nsuffix2);
840: return ("ip6.int");
841: }
842:
843: void
844: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
845: int i, nserv;
846: size_t size;
847:
848: /* close open servers */
849: res_nclose(statp);
850:
851: /* cause rtt times to be forgotten */
852: statp->_u._ext.nscount = 0;
853:
854: nserv = 0;
855: for (i = 0; i < cnt && nserv < MAXNS; i++) {
856: switch (set->sin.sin_family) {
857: case AF_INET:
858: size = sizeof(set->sin);
859: if (statp->_u._ext.ext)
860: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
861: &set->sin, size);
862: if (size <= sizeof(statp->nsaddr_list[nserv]))
863: memcpy(&statp->nsaddr_list[nserv],
864: &set->sin, size);
865: else
866: statp->nsaddr_list[nserv].sin_family = 0;
867: nserv++;
868: break;
869:
870: #ifdef HAS_INET6_STRUCTS
871: case AF_INET6:
872: size = sizeof(set->sin6);
873: if (statp->_u._ext.ext)
874: memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
875: &set->sin6, size);
876: if (size <= sizeof(statp->nsaddr_list[nserv]))
877: memcpy(&statp->nsaddr_list[nserv],
878: &set->sin6, size);
879: else
880: statp->nsaddr_list[nserv].sin_family = 0;
881: nserv++;
882: break;
883: #endif
884:
885: default:
886: break;
887: }
888: set++;
889: }
890: statp->nscount = nserv;
891:
892: }
893:
894: int
895: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
896: int i;
897: size_t size;
898: u_int16_t family;
899:
900: for (i = 0; i < statp->nscount && i < cnt; i++) {
901: if (statp->_u._ext.ext)
902: family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
903: else
904: family = statp->nsaddr_list[i].sin_family;
905:
906: switch (family) {
907: case AF_INET:
908: size = sizeof(set->sin);
909: if (statp->_u._ext.ext)
910: memcpy(&set->sin,
911: &statp->_u._ext.ext->nsaddrs[i],
912: size);
913: else
914: memcpy(&set->sin, &statp->nsaddr_list[i],
915: size);
916: break;
917:
918: #ifdef HAS_INET6_STRUCTS
919: case AF_INET6:
920: size = sizeof(set->sin6);
921: if (statp->_u._ext.ext)
922: memcpy(&set->sin6,
923: &statp->_u._ext.ext->nsaddrs[i],
924: size);
925: else
926: memcpy(&set->sin6, &statp->nsaddr_list[i],
927: size);
928: break;
929: #endif
930:
931: default:
932: set->sin.sin_family = 0;
933: break;
934: }
935: set++;
936: }
937: return (statp->nscount);
938: }
1.9 christos 939:
940: /*! \file */
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