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
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
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/types.h>
62 #include <sys/param.h>
63 #include <sys/socket.h>
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
67 #include <arpa/nameser.h>
72 #if defined(BSD) && (BSD >= 199103)
77 # include "../conf/portability.h"
80 /*-------------------------------------- info about "sortlist" --------------
81 * Marc Majka 1994/04/16
82 * Allan Nathanson 1994/10/29 (BIND 4.9.3.x)
84 * NetInfo resolver configuration directory support.
86 * Allow a NetInfo directory to be created in the hierarchy which
87 * contains the same information as the resolver configuration file.
89 * - The local domain name is stored as the value of the "domain" property.
90 * - The Internet address(es) of the name server(s) are stored as values
91 * of the "nameserver" property.
92 * - The name server addresses are stored as values of the "nameserver"
94 * - The search list for host-name lookup is stored as values of the
96 * - The sortlist comprised of IP address netmask pairs are stored as
97 * values of the "sortlist" property. The IP address and optional netmask
98 * should be seperated by a slash (/) or ampersand (&) character.
99 * - Internal resolver variables can be set from the value of the "options"
103 # include <netinfo/ni.h>
104 # define NI_PATH_RESCONF "/locations/resolver"
105 # define NI_TIMEOUT 10
106 static int netinfo_res_init
__P((int *haveenv
, int *havesearch
));
109 #if defined(USE_OPTIONS_H)
110 # include "../conf/options.h"
113 static void res_setoptions
__P((char *, char *));
116 static const char sort_mask
[] = "/&";
117 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
118 static u_int32_t net_mask
__P((struct in_addr
));
121 #if !defined(isascii) /* XXX - could be a function */
122 # define isascii(c) (!(c & 0200))
126 * Resolver state default settings.
129 struct __res_state _res
;
132 * Set up default settings. If the configuration file exist, the values
133 * there will have precedence. Otherwise, the server address is set to
134 * INADDR_ANY and the default domain name comes from the gethostname().
136 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
137 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
138 * since it was noted that INADDR_ANY actually meant ``the first interface
139 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
140 * it had to be "up" in order for you to reach your own name server. It
141 * was later decided that since the recommended practice is to always
142 * install local static routes through 127.0.0.1 for all your network
143 * interfaces, that we could solve this problem without a code change.
145 * The configuration file should always be used, since it is the only way
146 * to specify a default domain. If you are running a server on your local
147 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
148 * in the configuration file.
150 * Return 0 if completes successfully, -1 on error
156 register char *cp
, **pp
;
159 int nserv
= 0; /* number of nameserver records read from file */
171 * These three fields used to be statically initialized. This made
172 * it hard to use this code in a shared library. It is necessary,
173 * now that we're doing dynamic initialization here, that we preserve
174 * the old semantics: if an application modifies one of these three
175 * fields of _res before res_init() is called, res_init() will not
176 * alter them. Of course, if an application is setting them to
177 * _zero_ before calling res_init(), hoping to override what used
178 * to be the static default, we can't detect it and unexpected results
179 * will follow. Zero for any of these fields would make no sense,
180 * so one can safely assume that the applications were already getting
181 * unexpected results.
183 * _res.options is tricky since some apps were known to diddle the bits
184 * before res_init() was first called. We can't replicate that semantic
185 * with dynamic initialization (they may have turned bits off that are
186 * set in RES_DEFAULT). Our solution is to declare such applications
187 * "broken". They could fool us by setting RES_INIT but none do (yet).
190 _res
.retrans
= RES_TIMEOUT
;
193 if (!(_res
.options
& RES_INIT
))
194 _res
.options
= RES_DEFAULT
;
197 * This one used to initialize implicitly to zero, so unless the app
198 * has set it to something in particular, we can randomize it now.
201 _res
.id
= res_randomid();
204 _res
.nsaddr
.sin_addr
= inet_makeaddr(IN_LOOPBACKNET
, 1);
206 _res
.nsaddr
.sin_addr
.s_addr
= INADDR_ANY
;
208 _res
.nsaddr
.sin_family
= AF_INET
;
209 _res
.nsaddr
.sin_port
= htons(NAMESERVER_PORT
);
214 /* Allow user to override the local domain definition */
215 if ((cp
= getenv("LOCALDOMAIN")) != NULL
) {
216 (void)strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
220 * Set search list to be blank-separated strings
221 * from rest of env value. Permits users of LOCALDOMAIN
222 * to still have a search list, and anyone to set the
223 * one that they want to use as an individual (even more
224 * important now that the rfc1535 stuff restricts searches)
229 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
230 if (*cp
== '\n') /* silly backwards compat */
232 else if (*cp
== ' ' || *cp
== '\t') {
241 /* null terminate last domain if there are excess */
242 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t' && *cp
!= '\n')
248 #define MATCH(line, name) \
249 (!strncmp(line, name, sizeof(name) - 1) && \
250 (line[sizeof(name) - 1] == ' ' || \
251 line[sizeof(name) - 1] == '\t'))
254 if (netinfo_res_init(&haveenv
, &havesearch
) == 0)
256 if ((fp
= fopen(_PATH_RESCONF
, "r")) != NULL
) {
257 /* read the config file */
258 while (fgets(buf
, sizeof(buf
), fp
) != NULL
) {
260 if (*buf
== ';' || *buf
== '#')
262 /* read default domain name */
263 if (MATCH(buf
, "domain")) {
264 if (haveenv
) /* skip if have from environ */
266 cp
= buf
+ sizeof("domain") - 1;
267 while (*cp
== ' ' || *cp
== '\t')
269 if ((*cp
== '\0') || (*cp
== '\n'))
271 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
272 if ((cp
= strpbrk(_res
.defdname
, " \t\n")) != NULL
)
277 /* set search list */
278 if (MATCH(buf
, "search")) {
279 if (haveenv
) /* skip if have from environ */
281 cp
= buf
+ sizeof("search") - 1;
282 while (*cp
== ' ' || *cp
== '\t')
284 if ((*cp
== '\0') || (*cp
== '\n'))
286 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
287 if ((cp
= strchr(_res
.defdname
, '\n')) != NULL
)
290 * Set search list to be blank-separated strings
296 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
297 if (*cp
== ' ' || *cp
== '\t') {
305 /* null terminate last domain if there are excess */
306 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t')
313 /* read nameservers to query */
314 if (MATCH(buf
, "nameserver") && nserv
< MAXNS
) {
317 cp
= buf
+ sizeof("nameserver") - 1;
318 while (*cp
== ' ' || *cp
== '\t')
320 if ((*cp
!= '\0') && (*cp
!= '\n') && inet_aton(cp
, &a
)) {
321 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
322 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
323 _res
.nsaddr_list
[nserv
].sin_port
=
324 htons(NAMESERVER_PORT
);
330 if (MATCH(buf
, "sortlist")) {
333 cp
= buf
+ sizeof("sortlist") - 1;
334 while (nsort
< MAXRESOLVSORT
) {
335 while (*cp
== ' ' || *cp
== '\t')
337 if (*cp
== '\0' || *cp
== '\n' || *cp
== ';')
340 while (*cp
&& !ISSORTMASK(*cp
) && *cp
!= ';' &&
341 isascii(*cp
) && !isspace(*cp
))
345 if (inet_aton(net
, &a
)) {
346 _res
.sort_list
[nsort
].addr
= a
;
350 while (*cp
&& *cp
!= ';' &&
351 isascii(*cp
) && !isspace(*cp
))
355 if (inet_aton(net
, &a
)) {
356 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
358 _res
.sort_list
[nsort
].mask
=
359 net_mask(_res
.sort_list
[nsort
].addr
);
362 _res
.sort_list
[nsort
].mask
=
363 net_mask(_res
.sort_list
[nsort
].addr
);
372 if (MATCH(buf
, "options")) {
373 res_setoptions(buf
+ sizeof("options") - 1, "conf");
378 _res
.nscount
= nserv
;
384 if (_res
.defdname
[0] == 0 &&
385 gethostname(buf
, sizeof(_res
.defdname
) - 1) == 0 &&
386 (cp
= strchr(buf
, '.')) != NULL
)
387 strcpy(_res
.defdname
, cp
+ 1);
389 /* find components of local domain that might be searched */
390 if (havesearch
== 0) {
392 *pp
++ = _res
.defdname
;
397 for (cp
= _res
.defdname
; *cp
; cp
++)
398 dots
+= (*cp
== '.');
401 while (pp
< _res
.dnsrch
+ MAXDFLSRCH
) {
402 if (dots
< LOCALDOMAINPARTS
)
404 cp
= strchr(cp
, '.') + 1; /* we know there is one */
410 if (_res
.options
& RES_DEBUG
) {
411 printf(";; res_init()... default dnsrch list:\n");
412 for (pp
= _res
.dnsrch
; *pp
; pp
++)
413 printf(";;\t%s\n", *pp
);
414 printf(";;\t..END..\n");
417 #endif /* !RFC1535 */
420 if ((cp
= getenv("RES_OPTIONS")) != NULL
)
421 res_setoptions(cp
, "env");
422 _res
.options
|= RES_INIT
;
427 res_setoptions(options
, source
)
428 char *options
, *source
;
434 if (_res
.options
& RES_DEBUG
)
435 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
439 /* skip leading and inner runs of spaces */
440 while (*cp
== ' ' || *cp
== '\t')
442 /* search for and process individual options */
443 if (!strncmp(cp
, "ndots:", sizeof("ndots:") - 1)) {
444 i
= atoi(cp
+ sizeof("ndots:") - 1);
445 if (i
<= RES_MAXNDOTS
)
448 _res
.ndots
= RES_MAXNDOTS
;
450 if (_res
.options
& RES_DEBUG
)
451 printf(";;\tndots=%d\n", _res
.ndots
);
453 } else if (!strncmp(cp
, "debug", sizeof("debug") - 1)) {
455 if (!(_res
.options
& RES_DEBUG
)) {
456 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
458 _res
.options
|= RES_DEBUG
;
460 printf(";;\tdebug\n");
462 } else if (!strncmp(cp
, "inet6", sizeof("inet6") - 1)) {
463 _res
.options
|= RES_USE_INET6
;
465 /* XXX - print a warning here? */
467 /* skip to next run of spaces */
468 while (*cp
&& *cp
!= ' ' && *cp
!= '\t')
474 /* XXX - should really support CIDR which means explicit masks always. */
476 net_mask(in
) /* XXX - should really use system's version of this */
479 register u_int32_t i
= ntohl(in
.s_addr
);
482 return (htonl(IN_CLASSA_NET
));
483 else if (IN_CLASSB(i
))
484 return (htonl(IN_CLASSB_NET
));
485 return (htonl(IN_CLASSC_NET
));
491 netinfo_res_init(haveenv
, havesearch
)
496 void *domain
, *parent
;
505 status
= ni_open(NULL
, ".", &domain
);
506 if (status
== NI_OK
) {
507 ni_setreadtimeout(domain
, NI_TIMEOUT
);
508 ni_setabort(domain
, 1);
510 /* climb the NetInfo hierarchy to find a resolver directory */
511 while (status
== NI_OK
) {
512 status
= ni_pathsearch(domain
, &dir
, NI_PATH_RESCONF
);
513 if (status
== NI_OK
) {
514 /* found a resolver directory */
517 /* get the default domain name */
518 status
= ni_lookupprop(domain
, &dir
, "domain", &nl
);
519 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
520 (void)strncpy(_res
.defdname
,
521 nl
.ni_namelist_val
[0],
522 sizeof(_res
.defdname
) - 1);
523 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
524 ni_namelist_free(&nl
);
528 /* get search list */
529 status
= ni_lookupprop(domain
, &dir
, "search", &nl
);
530 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
531 (void)strncpy(_res
.defdname
,
532 nl
.ni_namelist_val
[0],
533 sizeof(_res
.defdname
) - 1);
534 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
537 n
< nl
.ni_namelist_len
&& n
< MAXDNSRCH
;
539 /* duplicate up to MAXDNSRCH servers */
540 char *cp
= nl
.ni_namelist_val
[n
];
542 strcpy((char *)malloc(strlen(cp
) + 1), cp
);
544 ni_namelist_free(&nl
);
549 /* get list of nameservers */
550 status
= ni_lookupprop(domain
, &dir
, "nameserver", &nl
);
551 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
552 /* copy up to MAXNS servers */
554 n
< nl
.ni_namelist_len
&& nserv
< MAXNS
;
558 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
559 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
560 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
561 _res
.nsaddr_list
[nserv
].sin_port
=
562 htons(NAMESERVER_PORT
);
566 ni_namelist_free(&nl
);
570 _res
.nscount
= nserv
;
574 status
= ni_lookupprop(domain
, &dir
, "sortlist", &nl
);
575 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
577 /* copy up to MAXRESOLVSORT address/netmask pairs */
579 n
< nl
.ni_namelist_len
&& nsort
< MAXRESOLVSORT
;
587 for (sp
= sort_mask
; *sp
; sp
++) {
589 cp1
= strchr(nl
.ni_namelist_val
[n
], *sp
);
591 cp
= (cp
< cp1
)? cp
: cp1
;
600 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
601 _res
.sort_list
[nsort
].addr
= a
;
602 if (*cp
&& ISSORTMASK(ch
)) {
604 if (inet_aton(cp
, &a
)) {
605 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
607 _res
.sort_list
[nsort
].mask
=
608 net_mask(_res
.sort_list
[nsort
].addr
);
611 _res
.sort_list
[nsort
].mask
=
612 net_mask(_res
.sort_list
[nsort
].addr
);
617 ni_namelist_free(&nl
);
623 /* get resolver options */
624 status
= ni_lookupprop(domain
, &dir
, "options", &nl
);
625 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
626 res_setoptions(nl
.ni_namelist_val
[0], "conf");
627 ni_namelist_free(&nl
);
631 return(1); /* using DNS configuration from NetInfo */
634 status
= ni_open(domain
, "..", &parent
);
640 return(0); /* if not using DNS configuration from NetInfo */
649 gettimeofday(&now
, NULL
);
650 return (0xffff & (now
.tv_sec
^ now
.tv_usec
^ getpid()));