2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
4 * @APPLE_LICENSE_HEADER_START@
6 * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7 * Reserved. This file contains Original Code and/or Modifications of
8 * Original Code as defined in and that are subject to the Apple Public
9 * Source License Version 1.1 (the "License"). You may not use this file
10 * except in compliance with the License. Please obtain a copy of the
11 * License at http://www.apple.com/publicsource and read it before using
14 * The Original Code and all software distributed under the License are
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16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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22 * @APPLE_LICENSE_HEADER_END@
25 * ++Copyright++ 1985, 1989, 1993
27 * Copyright (c) 1985, 1989, 1993
28 * The Regents of the University of California. All rights reserved.
30 * Redistribution and use in source and binary forms, with or without
31 * modification, are permitted provided that the following conditions
33 * 1. Redistributions of source code must retain the above copyright
34 * notice, this list of conditions and the following disclaimer.
35 * 2. Redistributions in binary form must reproduce the above copyright
36 * notice, this list of conditions and the following disclaimer in the
37 * documentation and/or other materials provided with the distribution.
38 * 3. All advertising materials mentioning features or use of this software
39 * must display the following acknowledgement:
40 * This product includes software developed by the University of
41 * California, Berkeley and its contributors.
42 * 4. Neither the name of the University nor the names of its contributors
43 * may be used to endorse or promote products derived from this software
44 * without specific prior written permission.
46 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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, and that
63 * the name of Digital Equipment Corporation not be used in advertising or
64 * publicity pertaining to distribution of the document or software without
65 * specific, written prior permission.
67 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
68 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
69 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
70 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
71 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
72 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
73 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
79 #if defined(LIBC_SCCS) && !defined(lint)
80 static char sccsid
[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
81 static char rcsid
[] = "$Id: res_init.c,v 1.5 2002/03/26 20:12:06 ajn Exp $";
82 #endif /* LIBC_SCCS and not lint */
84 #include <sys/param.h>
85 #include <sys/socket.h>
87 #include <netinet/in.h>
88 #include <arpa/inet.h>
89 #include <arpa/nameser.h>
94 #if defined(BSD) && (BSD >= 199103)
99 # include "portability.h"
102 /*-------------------------------------- info about "sortlist" --------------
103 * Marc Majka 1994/04/16
104 * Allan Nathanson 1994/10/29 (BIND 4.9.3.x)
106 * NetInfo resolver configuration directory support.
108 * Allow a NetInfo directory to be created in the hierarchy which
109 * contains the same information as the resolver configuration file.
111 * - The local domain name is stored as the value of the "domain" property.
112 * - The Internet address(es) of the name server(s) are stored as values
113 * of the "nameserver" property.
114 * - The name server addresses are stored as values of the "nameserver"
116 * - The search list for host-name lookup is stored as values of the
118 * - The sortlist comprised of IP address netmask pairs are stored as
119 * values of the "sortlist" property. The IP address and optional netmask
120 * should be seperated by a slash (/) or ampersand (&) character.
121 * - Internal resolver variables can be set from the value of the "options"
124 #if defined(__APPLE__) && defined(CONFIGURE_RESOLVER_FROM_NETINFO)
125 # include <netinfo/ni.h>
126 # define NI_PATH_RESCONF "/locations/resolver"
127 # define NI_TIMEOUT 10
128 static int netinfo_res_init
__P((int *haveenv
, int *havesearch
));
131 #if defined(USE_OPTIONS_H)
132 # include "options.h"
135 static void res_setoptions
__P((char *, char *));
138 static const char sort_mask
[] = "/&";
139 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
140 static u_int32_t net_mask
__P((struct in_addr
));
143 #if !defined(isascii) /* XXX - could be a function */
144 # define isascii(c) (!(c & 0200))
148 * Resolver state default settings.
151 #if defined(__APPLE__)
154 struct __res_state _res
;
157 * Set up default settings. If the configuration file exist, the values
158 * there will have precedence. Otherwise, the server address is set to
159 * INADDR_ANY and the default domain name comes from the gethostname().
161 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
162 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
163 * since it was noted that INADDR_ANY actually meant ``the first interface
164 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
165 * it had to be "up" in order for you to reach your own name server. It
166 * was later decided that since the recommended practice is to always
167 * install local static routes through 127.0.0.1 for all your network
168 * interfaces, that we could solve this problem without a code change.
170 * The configuration file should always be used, since it is the only way
171 * to specify a default domain. If you are running a server on your local
172 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
173 * in the configuration file.
175 * Return 0 if completes successfully, -1 on error
181 register char *cp
, **pp
;
184 int nserv
= 0; /* number of nameserver records read from file */
196 * These three fields used to be statically initialized. This made
197 * it hard to use this code in a shared library. It is necessary,
198 * now that we're doing dynamic initialization here, that we preserve
199 * the old semantics: if an application modifies one of these three
200 * fields of _res before res_init() is called, res_init() will not
201 * alter them. Of course, if an application is setting them to
202 * _zero_ before calling res_init(), hoping to override what used
203 * to be the static default, we can't detect it and unexpected results
204 * will follow. Zero for any of these fields would make no sense,
205 * so one can safely assume that the applications were already getting
206 * unexpected results.
208 * _res.options is tricky since some apps were known to diddle the bits
209 * before res_init() was first called. We can't replicate that semantic
210 * with dynamic initialization (they may have turned bits off that are
211 * set in RES_DEFAULT). Our solution is to declare such applications
212 * "broken". They could fool us by setting RES_INIT but none do (yet).
215 _res
.retrans
= RES_TIMEOUT
;
218 if (!(_res
.options
& RES_INIT
))
219 _res
.options
= RES_DEFAULT
;
222 * This one used to initialize implicitly to zero, so unless the app
223 * has set it to something in particular, we can randomize it now.
226 _res
.id
= res_randomid();
229 _res
.nsaddr
.sin_addr
= inet_makeaddr(IN_LOOPBACKNET
, 1);
231 _res
.nsaddr
.sin_addr
.s_addr
= INADDR_ANY
;
233 _res
.nsaddr
.sin_family
= AF_INET
;
234 _res
.nsaddr
.sin_port
= htons(NAMESERVER_PORT
);
239 /* Allow user to override the local domain definition */
240 if ((cp
= getenv("LOCALDOMAIN")) != NULL
) {
241 (void)strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
245 * Set search list to be blank-separated strings
246 * from rest of env value. Permits users of LOCALDOMAIN
247 * to still have a search list, and anyone to set the
248 * one that they want to use as an individual (even more
249 * important now that the rfc1535 stuff restricts searches)
254 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
255 if (*cp
== '\n') /* silly backwards compat */
257 else if (*cp
== ' ' || *cp
== '\t') {
266 /* null terminate last domain if there are excess */
267 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t' && *cp
!= '\n')
273 #define MATCH(line, name) \
274 (!strncmp(line, name, sizeof(name) - 1) && \
275 (line[sizeof(name) - 1] == ' ' || \
276 line[sizeof(name) - 1] == '\t'))
278 if ((fp
= fopen(_PATH_RESCONF
, "r")) != NULL
) {
279 /* read the config file */
280 while (fgets(buf
, sizeof(buf
), fp
) != NULL
) {
282 if (*buf
== ';' || *buf
== '#')
284 /* read default domain name */
285 if (MATCH(buf
, "domain")) {
286 if (haveenv
) /* skip if have from environ */
288 cp
= buf
+ sizeof("domain") - 1;
289 while (*cp
== ' ' || *cp
== '\t')
291 if ((*cp
== '\0') || (*cp
== '\n'))
293 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
294 if ((cp
= strpbrk(_res
.defdname
, " \t\n")) != NULL
)
299 /* set search list */
300 if (MATCH(buf
, "search")) {
301 if (haveenv
) /* skip if have from environ */
303 cp
= buf
+ sizeof("search") - 1;
304 while (*cp
== ' ' || *cp
== '\t')
306 if ((*cp
== '\0') || (*cp
== '\n'))
308 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
309 if ((cp
= strchr(_res
.defdname
, '\n')) != NULL
)
312 * Set search list to be blank-separated strings
318 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
319 if (*cp
== ' ' || *cp
== '\t') {
327 /* null terminate last domain if there are excess */
328 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t')
335 /* read nameservers to query */
336 if (MATCH(buf
, "nameserver") && nserv
< MAXNS
) {
339 cp
= buf
+ sizeof("nameserver") - 1;
340 while (*cp
== ' ' || *cp
== '\t')
342 if ((*cp
!= '\0') && (*cp
!= '\n') && inet_aton(cp
, &a
)) {
343 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
344 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
345 _res
.nsaddr_list
[nserv
].sin_port
=
346 htons(NAMESERVER_PORT
);
352 if (MATCH(buf
, "sortlist")) {
355 cp
= buf
+ sizeof("sortlist") - 1;
356 while (nsort
< MAXRESOLVSORT
) {
357 while (*cp
== ' ' || *cp
== '\t')
359 if (*cp
== '\0' || *cp
== '\n' || *cp
== ';')
362 while (*cp
&& !ISSORTMASK(*cp
) && *cp
!= ';' &&
363 isascii(*cp
) && !isspace(*cp
))
367 if (inet_aton(net
, &a
)) {
368 _res
.sort_list
[nsort
].addr
= a
;
372 while (*cp
&& *cp
!= ';' &&
373 isascii(*cp
) && !isspace(*cp
))
377 if (inet_aton(net
, &a
)) {
378 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
380 _res
.sort_list
[nsort
].mask
=
381 net_mask(_res
.sort_list
[nsort
].addr
);
384 _res
.sort_list
[nsort
].mask
=
385 net_mask(_res
.sort_list
[nsort
].addr
);
394 if (MATCH(buf
, "options")) {
395 res_setoptions(buf
+ sizeof("options") - 1, "conf");
400 _res
.nscount
= nserv
;
406 #if defined(__APPLE__) && defined(CONFIGURE_RESOLVER_FROM_NETINFO)
407 else netinfo_res_init(&haveenv
, &havesearch
);
410 if (_res
.defdname
[0] == 0 &&
411 gethostname(buf
, sizeof(_res
.defdname
) - 1) == 0 &&
412 (cp
= strchr(buf
, '.')) != NULL
)
413 strcpy(_res
.defdname
, cp
+ 1);
415 /* find components of local domain that might be searched */
416 if (havesearch
== 0) {
418 *pp
++ = _res
.defdname
;
423 for (cp
= _res
.defdname
; *cp
; cp
++)
424 dots
+= (*cp
== '.');
427 while (pp
< _res
.dnsrch
+ MAXDFLSRCH
) {
428 if (dots
< LOCALDOMAINPARTS
)
430 cp
= strchr(cp
, '.') + 1; /* we know there is one */
436 if (_res
.options
& RES_DEBUG
) {
437 printf(";; res_init()... default dnsrch list:\n");
438 for (pp
= _res
.dnsrch
; *pp
; pp
++)
439 printf(";;\t%s\n", *pp
);
440 printf(";;\t..END..\n");
443 #endif /* !RFC1535 */
446 if ((cp
= getenv("RES_OPTIONS")) != NULL
)
447 res_setoptions(cp
, "env");
448 _res
.options
|= RES_INIT
;
453 res_setoptions(options
, source
)
454 char *options
, *source
;
460 if (_res
.options
& RES_DEBUG
)
461 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
465 /* skip leading and inner runs of spaces */
466 while (*cp
== ' ' || *cp
== '\t')
468 /* search for and process individual options */
469 if (!strncmp(cp
, "ndots:", sizeof("ndots:") - 1)) {
470 i
= atoi(cp
+ sizeof("ndots:") - 1);
471 if (i
<= RES_MAXNDOTS
)
474 _res
.ndots
= RES_MAXNDOTS
;
476 if (_res
.options
& RES_DEBUG
)
477 printf(";;\tndots=%d\n", _res
.ndots
);
479 } else if (!strncmp(cp
, "debug", sizeof("debug") - 1)) {
481 if (!(_res
.options
& RES_DEBUG
)) {
482 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
484 _res
.options
|= RES_DEBUG
;
486 printf(";;\tdebug\n");
489 /* XXX - print a warning here? */
491 /* skip to next run of spaces */
492 while (*cp
&& *cp
!= ' ' && *cp
!= '\t')
498 /* XXX - should really support CIDR which means explicit masks always. */
500 net_mask(in
) /* XXX - should really use system's version of this */
503 register u_int32_t i
= ntohl(in
.s_addr
);
506 return (htonl(IN_CLASSA_NET
));
507 else if (IN_CLASSB(i
))
508 return (htonl(IN_CLASSB_NET
));
509 return (htonl(IN_CLASSC_NET
));
513 #if defined(__APPLE__) && defined(CONFIGURE_RESOLVER_FROM_NETINFO)
515 netinfo_res_init(haveenv
, havesearch
)
520 void *domain
, *parent
;
529 status
= ni_open(NULL
, ".", &domain
);
530 if (status
== NI_OK
) {
531 ni_setreadtimeout(domain
, NI_TIMEOUT
);
532 ni_setabort(domain
, 1);
534 /* climb the NetInfo hierarchy to find a resolver directory */
535 while (status
== NI_OK
) {
536 status
= ni_pathsearch(domain
, &dir
, NI_PATH_RESCONF
);
537 if (status
== NI_OK
) {
538 /* found a resolver directory */
541 /* get the default domain name */
542 status
= ni_lookupprop(domain
, &dir
, "domain", &nl
);
543 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
544 (void)strncpy(_res
.defdname
,
545 nl
.ni_namelist_val
[0],
546 sizeof(_res
.defdname
) - 1);
547 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
548 ni_namelist_free(&nl
);
552 /* get search list */
553 status
= ni_lookupprop(domain
, &dir
, "search", &nl
);
554 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
555 (void)strncpy(_res
.defdname
,
556 nl
.ni_namelist_val
[0],
557 sizeof(_res
.defdname
) - 1);
558 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
561 n
< nl
.ni_namelist_len
&& n
< MAXDNSRCH
;
563 /* duplicate up to MAXDNSRCH servers */
564 char *cp
= nl
.ni_namelist_val
[n
];
566 strcpy((char *)malloc(strlen(cp
) + 1), cp
);
568 ni_namelist_free(&nl
);
573 /* get list of nameservers */
574 status
= ni_lookupprop(domain
, &dir
, "nameserver", &nl
);
575 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
576 /* copy up to MAXNS servers */
578 n
< nl
.ni_namelist_len
&& nserv
< MAXNS
;
582 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
583 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
584 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
585 _res
.nsaddr_list
[nserv
].sin_port
=
586 htons(NAMESERVER_PORT
);
590 ni_namelist_free(&nl
);
594 _res
.nscount
= nserv
;
598 status
= ni_lookupprop(domain
, &dir
, "sortlist", &nl
);
599 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
601 /* copy up to MAXRESOLVSORT address/netmask pairs */
603 n
< nl
.ni_namelist_len
&& nsort
< MAXRESOLVSORT
;
611 for (sp
= sort_mask
; *sp
; sp
++) {
613 cp1
= strchr(nl
.ni_namelist_val
[n
], *sp
);
615 cp
= (cp
< cp1
)? cp
: cp1
;
624 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
625 _res
.sort_list
[nsort
].addr
= a
;
626 if (*cp
&& ISSORTMASK(ch
)) {
628 if (inet_aton(cp
, &a
)) {
629 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
631 _res
.sort_list
[nsort
].mask
=
632 net_mask(_res
.sort_list
[nsort
].addr
);
635 _res
.sort_list
[nsort
].mask
=
636 net_mask(_res
.sort_list
[nsort
].addr
);
641 ni_namelist_free(&nl
);
647 /* get resolver options */
648 status
= ni_lookupprop(domain
, &dir
, "options", &nl
);
649 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
650 res_setoptions(nl
.ni_namelist_val
[0], "conf");
651 ni_namelist_free(&nl
);
655 return(1); /* using DNS configuration from NetInfo */
658 status
= ni_open(domain
, "..", &parent
);
664 return(0); /* if not using DNS configuration from NetInfo */
666 #endif /* __APPLE__ */
673 gettimeofday(&now
, NULL
);
674 return (0xffff & (now
.tv_sec
^ now
.tv_usec
^ getpid()));