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 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
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
31 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
35 * copyright notice and this permission notice appear in all copies, and that
36 * the name of Digital Equipment Corporation not be used in advertising or
37 * publicity pertaining to distribution of the document or software without
38 * specific, written prior permission.
40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
52 #if defined(LIBC_SCCS) && !defined(lint)
53 static char sccsid
[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
54 static char rcsid
[] = "$Id$";
55 #endif /* LIBC_SCCS and not lint */
57 #include <sys/types.h>
58 #include <sys/param.h>
59 #include <sys/socket.h>
61 #include <netinet/in.h>
62 #include <arpa/inet.h>
63 #include <arpa/nameser.h>
68 #if defined(BSD) && (BSD >= 199103)
73 # include "../conf/portability.h"
76 /*-------------------------------------- info about "sortlist" --------------
77 * Marc Majka 1994/04/16
78 * Allan Nathanson 1994/10/29 (BIND 4.9.3.x)
80 * NetInfo resolver configuration directory support.
82 * Allow a NetInfo directory to be created in the hierarchy which
83 * contains the same information as the resolver configuration file.
85 * - The local domain name is stored as the value of the "domain" property.
86 * - The Internet address(es) of the name server(s) are stored as values
87 * of the "nameserver" property.
88 * - The name server addresses are stored as values of the "nameserver"
90 * - The search list for host-name lookup is stored as values of the
92 * - The sortlist comprised of IP address netmask pairs are stored as
93 * values of the "sortlist" property. The IP address and optional netmask
94 * should be separated by a slash (/) or ampersand (&) character.
95 * - Internal resolver variables can be set from the value of the "options"
99 # include <netinfo/ni.h>
100 # define NI_PATH_RESCONF "/locations/resolver"
101 # define NI_TIMEOUT 10
102 static int netinfo_res_init
__P((int *haveenv
, int *havesearch
));
105 #if defined(USE_OPTIONS_H)
106 # include "../conf/options.h"
109 static void res_setoptions
__P((char *, char *)) internal_function
;
112 static const char sort_mask
[] = "/&";
113 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
114 static u_int32_t net_mask
__P((struct in_addr
));
117 #if !defined(isascii) /* XXX - could be a function */
118 # define isascii(c) (!(c & 0200))
122 * Resolver state default settings.
125 struct __res_state _res
126 # if defined(__BIND_RES_TEXT)
127 = { RES_TIMEOUT
, } /* Motorola, et al. */
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);
207 _res
.nsaddr
.sin_addr
.s_addr
= INADDR_ANY
;
210 _res
.nsaddr
.sin_family
= AF_INET
;
211 _res
.nsaddr
.sin_port
= htons(NAMESERVER_PORT
);
215 /* Allow user to override the local domain definition */
216 if ((cp
= __secure_getenv("LOCALDOMAIN")) != NULL
) {
217 (void)strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
221 * Set search list to be blank-separated strings
222 * from rest of env value. Permits users of LOCALDOMAIN
223 * to still have a search list, and anyone to set the
224 * one that they want to use as an individual (even more
225 * important now that the rfc1535 stuff restricts searches)
230 for (n
= 0; *cp
&& pp
< _res
.dnsrch
+ MAXDNSRCH
; cp
++) {
231 if (*cp
== '\n') /* silly backwards compat */
233 else if (*cp
== ' ' || *cp
== '\t') {
242 /* null terminate last domain if there are excess */
243 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t' && *cp
!= '\n')
249 #define MATCH(line, name) \
250 (!strncmp(line, name, sizeof(name) - 1) && \
251 (line[sizeof(name) - 1] == ' ' || \
252 line[sizeof(name) - 1] == '\t'))
255 if (netinfo_res_init(&haveenv
, &havesearch
) == 0)
257 if ((fp
= fopen(_PATH_RESCONF
, "r")) != NULL
) {
258 /* read the config file */
259 while (fgets_unlocked(buf
, sizeof(buf
), fp
) != NULL
) {
261 if (*buf
== ';' || *buf
== '#')
263 /* read default domain name */
264 if (MATCH(buf
, "domain")) {
265 if (haveenv
) /* skip if have from environ */
267 cp
= buf
+ sizeof("domain") - 1;
268 while (*cp
== ' ' || *cp
== '\t')
270 if ((*cp
== '\0') || (*cp
== '\n'))
272 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
273 if ((cp
= strpbrk(_res
.defdname
, " \t\n")) != NULL
)
278 /* set search list */
279 if (MATCH(buf
, "search")) {
280 if (haveenv
) /* skip if have from environ */
282 cp
= buf
+ sizeof("search") - 1;
283 while (*cp
== ' ' || *cp
== '\t')
285 if ((*cp
== '\0') || (*cp
== '\n'))
287 strncpy(_res
.defdname
, cp
, sizeof(_res
.defdname
) - 1);
288 *__strchrnul (_res
.defdname
, '\n') = '\0';
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");
377 if (nserv
> _res
.nscount
)
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
= __rawmemchr(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
= __secure_getenv("RES_OPTIONS")) != NULL
)
421 res_setoptions(cp
, "env");
422 _res
.options
|= RES_INIT
;
428 res_setoptions(options
, source
)
429 char *options
, *source
;
435 if (_res
.options
& RES_DEBUG
)
436 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
440 /* skip leading and inner runs of spaces */
441 while (*cp
== ' ' || *cp
== '\t')
443 /* search for and process individual options */
444 if (!strncmp(cp
, "ndots:", sizeof("ndots:") - 1)) {
445 i
= atoi(cp
+ sizeof("ndots:") - 1);
446 if (i
<= RES_MAXNDOTS
)
449 _res
.ndots
= RES_MAXNDOTS
;
451 if (_res
.options
& RES_DEBUG
)
452 printf(";;\tndots=%d\n", _res
.ndots
);
454 } else if (!strncmp(cp
, "debug", sizeof("debug") - 1)) {
456 if (!(_res
.options
& RES_DEBUG
)) {
457 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
459 _res
.options
|= RES_DEBUG
;
461 printf(";;\tdebug\n");
463 } else if (!strncmp(cp
, "inet6", sizeof("inet6") - 1)) {
464 _res
.options
|= RES_USE_INET6
;
466 /* XXX - print a warning here? */
468 /* skip to next run of spaces */
469 while (*cp
&& *cp
!= ' ' && *cp
!= '\t')
475 /* XXX - should really support CIDR which means explicit masks always. */
477 net_mask(in
) /* XXX - should really use system's version of this */
480 register u_int32_t i
= ntohl(in
.s_addr
);
483 return (htonl(IN_CLASSA_NET
));
484 else if (IN_CLASSB(i
))
485 return (htonl(IN_CLASSB_NET
));
486 return (htonl(IN_CLASSC_NET
));
492 netinfo_res_init(haveenv
, havesearch
)
497 void *domain
, *parent
;
506 status
= ni_open(NULL
, ".", &domain
);
507 if (status
== NI_OK
) {
508 ni_setreadtimeout(domain
, NI_TIMEOUT
);
509 ni_setabort(domain
, 1);
511 /* climb the NetInfo hierarchy to find a resolver directory */
512 while (status
== NI_OK
) {
513 status
= ni_pathsearch(domain
, &dir
, NI_PATH_RESCONF
);
514 if (status
== NI_OK
) {
515 /* found a resolver directory */
518 /* get the default domain name */
519 status
= ni_lookupprop(domain
, &dir
, "domain", &nl
);
520 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
521 (void)strncpy(_res
.defdname
,
522 nl
.ni_namelist_val
[0],
523 sizeof(_res
.defdname
) - 1);
524 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
525 ni_namelist_free(&nl
);
529 /* get search list */
530 status
= ni_lookupprop(domain
, &dir
, "search", &nl
);
531 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
532 (void)strncpy(_res
.defdname
,
533 nl
.ni_namelist_val
[0],
534 sizeof(_res
.defdname
) - 1);
535 _res
.defdname
[sizeof(_res
.defdname
) - 1] = '\0';
538 n
< nl
.ni_namelist_len
&& n
< MAXDNSRCH
;
540 /* duplicate up to MAXDNSRCH servers */
541 char *cp
= nl
.ni_namelist_val
[n
];
543 strcpy((char *)malloc(strlen(cp
) + 1), cp
);
545 ni_namelist_free(&nl
);
550 /* get list of nameservers */
551 status
= ni_lookupprop(domain
, &dir
, "nameserver", &nl
);
552 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
553 /* copy up to MAXNS servers */
555 n
< nl
.ni_namelist_len
&& nserv
< MAXNS
;
559 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
560 _res
.nsaddr_list
[nserv
].sin_addr
= a
;
561 _res
.nsaddr_list
[nserv
].sin_family
= AF_INET
;
562 _res
.nsaddr_list
[nserv
].sin_port
=
563 htons(NAMESERVER_PORT
);
567 ni_namelist_free(&nl
);
570 if (nserv
> _res
.nscount
)
571 _res
.nscount
= nserv
;
575 status
= ni_lookupprop(domain
, &dir
, "sortlist", &nl
);
576 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
578 /* copy up to MAXRESOLVSORT address/netmask pairs */
580 n
< nl
.ni_namelist_len
&& nsort
< MAXRESOLVSORT
;
588 for (sp
= sort_mask
; *sp
; sp
++) {
590 cp1
= strchr(nl
.ni_namelist_val
[n
], *sp
);
592 cp
= (cp
< cp1
)? cp
: cp1
;
601 if (inet_aton(nl
.ni_namelist_val
[n
], &a
)) {
602 _res
.sort_list
[nsort
].addr
= a
;
603 if (*cp
&& ISSORTMASK(ch
)) {
605 if (inet_aton(cp
, &a
)) {
606 _res
.sort_list
[nsort
].mask
= a
.s_addr
;
608 _res
.sort_list
[nsort
].mask
=
609 net_mask(_res
.sort_list
[nsort
].addr
);
612 _res
.sort_list
[nsort
].mask
=
613 net_mask(_res
.sort_list
[nsort
].addr
);
618 ni_namelist_free(&nl
);
624 /* get resolver options */
625 status
= ni_lookupprop(domain
, &dir
, "options", &nl
);
626 if (status
== NI_OK
&& nl
.ni_namelist_len
> 0) {
627 res_setoptions(nl
.ni_namelist_val
[0], "conf");
628 ni_namelist_free(&nl
);
632 return(1); /* using DNS configuration from NetInfo */
635 status
= ni_open(domain
, "..", &parent
);
641 return(0); /* if not using DNS configuration from NetInfo */
650 __gettimeofday(&now
, NULL
);
651 return (0xffff & (now
.tv_sec
^ now
.tv_usec
^ __getpid()));