2 * ++Copyright++ 1985, 1989, 1993
4 * Copyright (c) 1985, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
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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
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
56 #if defined(LIBC_SCCS) && !defined(lint)
57 static char sccsid
[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
58 static char rcsid
[] = "$Id$";
59 #endif /* LIBC_SCCS and not lint */
61 #include <sys/param.h>
62 #include <sys/socket.h>
63 #include <netinet/in.h>
64 #include <arpa/inet.h>
65 #include <arpa/nameser.h>
70 #if defined(BSD) && (BSD >= 199103)
75 # include "../conf/portability.h"
79 * Marc Majka 1994/04/16
80 * Allan Nathanson 1994/10/29 (BIND 4.9.3.x)
82 * NetInfo resolver configuration directory support.
84 * Allow a NetInfo directory to be created in the hierarchy which
85 * contains the same information as the resolver configuration file.
87 * - The local domain name is stored as the value of the "domain" property.
88 * - The Internet address(es) of the name server(s) are stored as values
89 * of the "nameserver" property.
90 * - The name server addresses are stored as values of the "nameserver"
92 * - The search list for host-name lookup is stored as values of the
94 * - The sortlist comprised of IP address netmask pairs are stored as
95 * values of the "sortlist" property. The IP address and optional netmask
96 * should be seperated by a slash (/) character.
97 * - Internal resolver variables can be set from the value of the "options"
102 # include <netinfo/ni.h>
103 # define NI_PATH_RESCONF "/locations/resolver"
104 # define NI_TIMEOUT 10
105 static int netinfo_res_init
__P((int *haveenv
, int *havesearch
));
108 #if defined(USE_OPTIONS_H)
109 # include "../conf/options.h"
112 static void res_setoptions
__P((char *, char *));
115 static u_int32_t net_mask
__P((struct in_addr
));
118 #if !defined(isascii) /* XXX - could be a function */
119 # define isascii(c) (!(c & 0200))
123 * Resolver state default settings.
126 struct __res_state _res
;
129 * Set up default settings. If the configuration file exist, the values
130 * there will have precedence. Otherwise, the server address is set to
131 * INADDR_ANY and the default domain name comes from the gethostname().
133 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
134 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
135 * since it was noted that INADDR_ANY actually meant ``the first interface
136 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
137 * it had to be "up" in order for you to reach your own name server. It
138 * was later decided that since the recommended practice is to always
139 * install local static routes through 127.0.0.1 for all your network
140 * interfaces, that we could solve this problem without a code change.
142 * The configuration file should always be used, since it is the only way
143 * to specify a default domain. If you are running a server on your local
144 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
145 * in the configuration file.
147 * Return 0 if completes successfully, -1 on error
152 register char *cp
, **pp
;
153 register int n
, dots
;
155 int nserv
= 0; /* number of nameserver records read from file */
164 * These three fields used to be statically initialized. This made
165 * it hard to use this code in a shared library. It is necessary,
166 * now that we're doing dynamic initialization here, that we preserve
167 * the old semantics: if an application modifies one of these three
168 * fields of _res before res_init() is called, res_init() will not
169 * alter them. Of course, if an application is setting them to
170 * _zero_ before calling res_init(), hoping to override what used
171 * to be the static default, we can't detect it and unexpected results
172 * will follow. Zero for any of these fields would make no sense,
173 * so one can safely assume that the applications were already getting
174 * unexpected results.
177 _res
.retrans
= RES_TIMEOUT
;
180 if (!(_res
.options
& RES_INIT
))
181 _res
.options
|= RES_DEFAULT
;
184 _res
.nsaddr
.sin_addr
= inet_makeaddr(IN_LOOPBACKNET
, 1);
186 _res
.nsaddr
.sin_addr
.s_addr
= INADDR_ANY
;
188 _res
.nsaddr
.sin_family
= AF_INET
;
189 _res
.nsaddr
.sin_port
= htons(NAMESERVER_PORT
);
194 /* Allow user to override the local domain definition */
195 if ((cp
= getenv("LOCALDOMAIN")) != NULL
) {
196 (void)strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
200 * Set search list to be blank-separated strings
201 * from rest of env value. Permits users of LOCALDOMAIN
202 * to still have a search list, and anyone to set the
203 * one that they want to use as an individual (even more
204 * important now that the rfc1535 stuff restricts searches)
209 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
210 if (*cp
== '\n') /* silly backwards compat */
212 else if (*cp
== ' ' || *cp
== '\t') {
221 /* null terminate last domain if there are excess */
222 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t' && *cp
!= '\n')
228 #define MATCH(line, name) \
229 (!strncmp(line, name, sizeof(name) - 1) && \
230 (line[sizeof(name) - 1] == ' ' || \
231 line[sizeof(name) - 1] == '\t'))
234 if (netinfo_res_init(&haveenv
, &havesearch
) == 0)
236 if ((fp
= fopen(_PATH_RESCONF
, "r")) != NULL
) {
237 /* read the config file */
238 while (fgets(buf
, sizeof(buf
), fp
) != NULL
) {
240 if (*buf
== ';' || *buf
== '#')
242 /* read default domain name */
243 if (MATCH(buf
, "domain")) {
244 if (haveenv
) /* skip if have from environ */
246 cp
= buf
+ sizeof("domain") - 1;
247 while (*cp
== ' ' || *cp
== '\t')
249 if ((*cp
== '\0') || (*cp
== '\n'))
251 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
252 if ((cp
= strpbrk(_res
.defdname
, " \t\n")) != NULL
)
257 /* set search list */
258 if (MATCH(buf
, "search")) {
259 if (haveenv
) /* skip if have from environ */
261 cp
= buf
+ sizeof("search") - 1;
262 while (*cp
== ' ' || *cp
== '\t')
264 if ((*cp
== '\0') || (*cp
== '\n'))
266 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
267 if ((cp
= strchr(_res
.defdname
, '\n')) != NULL
)
270 * Set search list to be blank-separated strings
276 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
277 if (*cp
== ' ' || *cp
== '\t') {
285 /* null terminate last domain if there are excess */
286 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t')
293 /* read nameservers to query */
294 if (MATCH(buf
, "nameserver") && nserv
< MAXNS
) {
297 cp
= buf
+ sizeof("nameserver") - 1;
298 while (*cp
== ' ' || *cp
== '\t')
300 if ((*cp
!= '\0') && (*cp
!= '\n') && inet_aton(cp
, &a
)) {
301 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
302 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
303 _res
.nsaddr_list
[nserv
].sin_port
=
304 htons(NAMESERVER_PORT
);
310 if (MATCH(buf
, "sortlist")) {
313 cp
= buf
+ sizeof("sortlist") - 1;
314 while (nsort
< MAXRESOLVSORT
) {
315 while (*cp
== ' ' || *cp
== '\t')
317 if (*cp
== '\0' || *cp
== '\n' || *cp
== ';')
320 while (*cp
&& *cp
!= '/' &&
321 isascii(*cp
) && !isspace(*cp
))
325 if (inet_aton(net
, &a
)) {
326 _res
.sort_list
[nsort
].addr
= a
;
330 while (*cp
&& isascii(*cp
) && !isspace(*cp
))
334 if (inet_aton(net
, &a
)) {
335 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
337 _res
.sort_list
[nsort
].mask
=
338 net_mask(_res
.sort_list
[nsort
].addr
);
341 _res
.sort_list
[nsort
].mask
=
342 net_mask(_res
.sort_list
[nsort
].addr
);
351 if (MATCH(buf
, "options")) {
352 res_setoptions(buf
+ sizeof("options") - 1, "conf");
357 _res
.nscount
= nserv
;
363 if (_res
.defdname
[0] == 0 &&
364 gethostname(buf
, sizeof(_res
.defdname
) - 1) == 0 &&
365 (cp
= strchr(buf
, '.')) != NULL
)
366 strcpy(_res
.defdname
, cp
+ 1);
368 /* find components of local domain that might be searched */
369 if (havesearch
== 0) {
371 *pp
++ = _res
.defdname
;
376 for (cp
= _res
.defdname
; *cp
; cp
++)
377 dots
+= (*cp
== '.');
380 while (pp
< _res
.dnsrch
+ MAXDFLSRCH
) {
381 if (dots
< LOCALDOMAINPARTS
)
383 cp
= strchr(cp
, '.') + 1; /* we know there is one */
389 if (_res
.options
& RES_DEBUG
) {
390 printf(";; res_init()... default dnsrch list:\n");
391 for (pp
= _res
.dnsrch
; *pp
; pp
++)
392 printf(";;\t%s\n", *pp
);
393 printf(";;\t..END..\n");
396 #endif /* !RFC1535 */
399 if ((cp
= getenv("RES_OPTIONS")) != NULL
)
400 res_setoptions(cp
, "env");
401 _res
.options
|= RES_INIT
;
406 res_setoptions(options
, source
)
407 char *options
, *source
;
413 if (_res
.options
& RES_DEBUG
)
414 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
418 /* skip leading and inner runs of spaces */
419 while (*cp
== ' ' || *cp
== '\t')
421 /* search for and process individual options */
422 if (!strncmp(cp
, "ndots:", sizeof("ndots:") - 1)) {
423 i
= atoi(cp
+ sizeof("ndots:") - 1);
424 if (i
<= RES_MAXNDOTS
)
427 _res
.ndots
= RES_MAXNDOTS
;
429 if (_res
.options
& RES_DEBUG
)
430 printf(";;\tndots=%d\n", _res
.ndots
);
432 } else if (!strncmp(cp
, "debug", sizeof("debug") - 1)) {
434 if (!(_res
.options
& RES_DEBUG
)) {
435 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
437 _res
.options
|= RES_DEBUG
;
439 printf(";;\tdebug\n");
442 /* XXX - print a warning here? */
444 /* skip to next run of spaces */
445 while (*cp
&& *cp
!= ' ' && *cp
!= '\t')
452 net_mask(in
) /* XXX - should really use system's version of this */
455 register u_int32_t i
= ntohl(in
.s_addr
);
458 return (htonl(IN_CLASSA_NET
));
459 else if (IN_CLASSB(i
))
460 return (htonl(IN_CLASSB_NET
));
461 return (htonl(IN_CLASSC_NET
));
467 netinfo_res_init(haveenv
, havesearch
)
472 void *domain
, *parent
;
481 status
= ni_open(NULL
, ".", &domain
);
482 if (status
== NI_OK
) {
483 ni_setreadtimeout(domain
, NI_TIMEOUT
);
484 ni_setabort(domain
, 1);
486 /* climb the NetInfo hierarchy to find a resolver directory */
487 while (status
== NI_OK
) {
488 status
= ni_pathsearch(domain
, &dir
, NI_PATH_RESCONF
);
489 if (status
== NI_OK
) {
490 /* found a resolver directory */
493 /* get the default domain name */
494 status
= ni_lookupprop(domain
, &dir
, "domain", &nl
);
495 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
496 (void)strncpy(_res
.defdname
,
497 nl
.ni_namelist_val
[0],
498 sizeof(_res
.defdname
) - 1);
499 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
500 ni_namelist_free(&nl
);
504 /* get search list */
505 status
= ni_lookupprop(domain
, &dir
, "search", &nl
);
506 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
507 (void)strncpy(_res
.defdname
,
508 nl
.ni_namelist_val
[0],
509 sizeof(_res
.defdname
) - 1);
510 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
513 n
< nl
.ni_namelist_len
&& n
< MAXDNSRCH
;
515 /* duplicate up to MAXDNSRCH servers */
516 char *cp
= nl
.ni_namelist_val
[n
];
518 strcpy((char *)malloc(strlen(cp
) + 1), cp
);
520 ni_namelist_free(&nl
);
525 /* get list of nameservers */
526 status
= ni_lookupprop(domain
, &dir
, "nameserver", &nl
);
527 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
528 /* copy up to MAXNS servers */
530 n
< nl
.ni_namelist_len
&& nserv
< MAXNS
;
534 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
535 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
536 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
537 _res
.nsaddr_list
[nserv
].sin_port
=
538 htons(NAMESERVER_PORT
);
542 ni_namelist_free(&nl
);
546 _res
.nscount
= nserv
;
550 status
= ni_lookupprop(domain
, &dir
, "sortlist", &nl
);
551 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
553 /* copy up to MAXRESOLVSORT address/netmask pairs */
555 n
< nl
.ni_namelist_len
&& nsort
< MAXRESOLVSORT
;
561 cp
= strchr(nl
.ni_namelist_val
[n
], '/');
567 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
568 _res
.sort_list
[nsort
].addr
= a
;
569 if (*cp
&& ch
== '/') {
571 if (inet_aton(cp
, &a
)) {
572 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
574 _res
.sort_list
[nsort
].mask
=
575 net_mask(_res
.sort_list
[nsort
].addr
);
578 _res
.sort_list
[nsort
].mask
=
579 net_mask(_res
.sort_list
[nsort
].addr
);
584 ni_namelist_free(&nl
);
590 /* get resolver options */
591 status
= ni_lookupprop(domain
, &dir
, "options", &nl
);
592 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
593 res_setoptions(nl
.ni_namelist_val
[0], "conf");
594 ni_namelist_free(&nl
);
598 return(1); /* using DNS configuration from NetInfo */
601 status
= ni_open(domain
, "..", &parent
);
607 return(0); /* if not using DNS configuration from NetInfo */