2 * Copyright (c) 1985, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * 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
51 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
53 * Permission to use, copy, modify, and distribute this software for any
54 * purpose with or without fee is hereby granted, provided that the above
55 * copyright notice and this permission notice appear in all copies.
57 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
58 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
59 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
60 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
61 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
62 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
63 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
67 #if defined(LIBC_SCCS) && !defined(lint)
68 static const char sccsid
[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
69 static const char rcsid
[] = "$BINDId: res_init.c,v 8.16 2000/05/09 07:10:12 vixie Exp $";
70 #endif /* LIBC_SCCS and not lint */
72 #include <sys/types.h>
73 #include <sys/param.h>
74 #include <sys/socket.h>
77 #include <netinet/in.h>
78 #include <arpa/inet.h>
79 #include <arpa/nameser.h>
88 /* Options. Should all be left alone. */
93 static void res_setoptions (res_state
, const char *, const char *)
97 static const char sort_mask
[] = "/&";
98 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
99 static u_int32_t net_mask
__P((struct in_addr
));
102 #if !defined(isascii) /* XXX - could be a function */
103 # define isascii(c) (!(c & 0200))
107 * Resolver state default settings.
111 * Set up default settings. If the configuration file exist, the values
112 * there will have precedence. Otherwise, the server address is set to
113 * INADDR_ANY and the default domain name comes from the gethostname().
115 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
116 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
117 * since it was noted that INADDR_ANY actually meant ``the first interface
118 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
119 * it had to be "up" in order for you to reach your own name server. It
120 * was later decided that since the recommended practice is to always
121 * install local static routes through 127.0.0.1 for all your network
122 * interfaces, that we could solve this problem without a code change.
124 * The configuration file should always be used, since it is the only way
125 * to specify a default domain. If you are running a server on your local
126 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
127 * in the configuration file.
129 * Return 0 if completes successfully, -1 on error
132 res_ninit(res_state statp
) {
133 extern int __res_vinit(res_state
, int);
135 return (__res_vinit(statp
, 0));
138 /* This function has to be reachable by res_data.c but not publically. */
140 __res_vinit(res_state statp
, int preinit
) {
142 register char *cp
, **pp
;
145 int nserv
= 0; /* number of nameserver records read from file */
147 int nservall
= 0; /* number of NS records read, nserv IPv4 only */
160 statp
->retrans
= RES_TIMEOUT
;
161 statp
->retry
= RES_DFLRETRY
;
162 statp
->options
= RES_DEFAULT
;
163 statp
->id
= res_randomid();
167 statp
->nsaddr
.sin_addr
= inet_makeaddr(IN_LOOPBACKNET
, 1);
169 statp
->nsaddr
.sin_addr
.s_addr
= INADDR_ANY
;
171 statp
->nsaddr
.sin_family
= AF_INET
;
172 statp
->nsaddr
.sin_port
= htons(NAMESERVER_PORT
);
180 statp
->_u
._ext
.nsinit
= 0;
181 statp
->_u
._ext
.nscount
= 0;
183 statp
->_u
._ext
.nscount6
= 0;
184 for (n
= 0; n
< MAXNS
; n
++)
185 statp
->_u
._ext
.nsaddrs
[n
] = NULL
;
188 /* Allow user to override the local domain definition */
189 if ((cp
= getenv("LOCALDOMAIN")) != NULL
) {
190 (void)strncpy(statp
->defdname
, cp
, sizeof(statp
->defdname
) - 1);
191 statp
->defdname
[sizeof(statp
->defdname
) - 1] = '\0';
195 * Set search list to be blank-separated strings
196 * from rest of env value. Permits users of LOCALDOMAIN
197 * to still have a search list, and anyone to set the
198 * one that they want to use as an individual (even more
199 * important now that the rfc1535 stuff restricts searches)
201 cp
= statp
->defdname
;
204 for (n
= 0; *cp
&& pp
< statp
->dnsrch
+ MAXDNSRCH
; cp
++) {
205 if (*cp
== '\n') /* silly backwards compat */
207 else if (*cp
== ' ' || *cp
== '\t') {
216 /* null terminate last domain if there are excess */
217 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t' && *cp
!= '\n')
223 #define MATCH(line, name) \
224 (!strncmp(line, name, sizeof(name) - 1) && \
225 (line[sizeof(name) - 1] == ' ' || \
226 line[sizeof(name) - 1] == '\t'))
228 if ((fp
= fopen(_PATH_RESCONF
, "r")) != NULL
) {
229 /* read the config file */
230 while (fgets_unlocked(buf
, sizeof(buf
), fp
) != NULL
) {
232 if (*buf
== ';' || *buf
== '#')
234 /* read default domain name */
235 if (MATCH(buf
, "domain")) {
236 if (haveenv
) /* skip if have from environ */
238 cp
= buf
+ sizeof("domain") - 1;
239 while (*cp
== ' ' || *cp
== '\t')
241 if ((*cp
== '\0') || (*cp
== '\n'))
243 strncpy(statp
->defdname
, cp
, sizeof(statp
->defdname
) - 1);
244 statp
->defdname
[sizeof(statp
->defdname
) - 1] = '\0';
245 if ((cp
= strpbrk(statp
->defdname
, " \t\n")) != NULL
)
250 /* set search list */
251 if (MATCH(buf
, "search")) {
252 if (haveenv
) /* skip if have from environ */
254 cp
= buf
+ sizeof("search") - 1;
255 while (*cp
== ' ' || *cp
== '\t')
257 if ((*cp
== '\0') || (*cp
== '\n'))
259 strncpy(statp
->defdname
, cp
, sizeof(statp
->defdname
) - 1);
260 statp
->defdname
[sizeof(statp
->defdname
) - 1] = '\0';
261 if ((cp
= strchr(statp
->defdname
, '\n')) != NULL
)
264 * Set search list to be blank-separated strings
267 cp
= statp
->defdname
;
270 for (n
= 0; *cp
&& pp
< statp
->dnsrch
+ MAXDNSRCH
; cp
++) {
271 if (*cp
== ' ' || *cp
== '\t') {
279 /* null terminate last domain if there are excess */
280 while (*cp
!= '\0' && *cp
!= ' ' && *cp
!= '\t')
287 /* read nameservers to query */
289 if (MATCH(buf
, "nameserver") && nservall
< MAXNS
) {
291 if (MATCH(buf
, "nameserver") && nserv
< MAXNS
) {
295 cp
= buf
+ sizeof("nameserver") - 1;
296 while (*cp
== ' ' || *cp
== '\t')
298 if ((*cp
!= '\0') && (*cp
!= '\n')
299 && __inet_aton(cp
, &a
)) {
300 statp
->nsaddr_list
[nserv
].sin_addr
= a
;
301 statp
->nsaddr_list
[nserv
].sin_family
= AF_INET
;
302 statp
->nsaddr_list
[nserv
].sin_port
=
303 htons(NAMESERVER_PORT
);
311 if ((el
= strchr(cp
, '\n')) != NULL
)
314 (inet_pton(AF_INET6
, cp
, &a6
) > 0)) {
315 struct sockaddr_in6
*sa6
;
317 sa6
= malloc(sizeof(*sa6
));
320 sa6
->sin6_family
= AF_INET6
;
321 sa6
->sin6_port
= htons(NAMESERVER_PORT
);
322 statp
->_u
._ext
.nsaddrs
[nservall
] = sa6
;
323 statp
->_u
._ext
.nstimes
[nservall
] = RES_MAXTIME
;
324 statp
->_u
._ext
.nssocks
[nservall
] = -1;
333 if (MATCH(buf
, "sortlist")) {
336 cp
= buf
+ sizeof("sortlist") - 1;
337 while (nsort
< MAXRESOLVSORT
) {
338 while (*cp
== ' ' || *cp
== '\t')
340 if (*cp
== '\0' || *cp
== '\n' || *cp
== ';')
343 while (*cp
&& !ISSORTMASK(*cp
) && *cp
!= ';' &&
344 isascii(*cp
) && !isspace(*cp
))
348 if (__inet_aton(net
, &a
)) {
349 statp
->sort_list
[nsort
].addr
= a
;
353 while (*cp
&& *cp
!= ';' &&
354 isascii(*cp
) && !isspace(*cp
))
358 if (__inet_aton(net
, &a
)) {
359 statp
->sort_list
[nsort
].mask
= a
.s_addr
;
361 statp
->sort_list
[nsort
].mask
=
362 net_mask(statp
->sort_list
[nsort
].addr
);
365 statp
->sort_list
[nsort
].mask
=
366 net_mask(statp
->sort_list
[nsort
].addr
);
375 if (MATCH(buf
, "options")) {
376 res_setoptions(statp
, buf
+ sizeof("options") - 1, "conf");
381 statp
->nscount
= nserv
;
383 if (nservall
- nserv
> 0)
384 statp
->_u
._ext
.nscount6
= nservall
- nserv
;
387 statp
->nsort
= nsort
;
391 if (statp
->defdname
[0] == 0 &&
392 __gethostname(buf
, sizeof(statp
->defdname
) - 1) == 0 &&
393 (cp
= strchr(buf
, '.')) != NULL
)
394 strcpy(statp
->defdname
, cp
+ 1);
396 /* find components of local domain that might be searched */
397 if (havesearch
== 0) {
399 *pp
++ = statp
->defdname
;
404 for (cp
= statp
->defdname
; *cp
; cp
++)
405 dots
+= (*cp
== '.');
407 cp
= statp
->defdname
;
408 while (pp
< statp
->dnsrch
+ MAXDFLSRCH
) {
409 if (dots
< LOCALDOMAINPARTS
)
411 cp
= __rawmemchr(cp
, '.') + 1; /* we know there is one */
417 if (statp
->options
& RES_DEBUG
) {
418 printf(";; res_init()... default dnsrch list:\n");
419 for (pp
= statp
->dnsrch
; *pp
; pp
++)
420 printf(";;\t%s\n", *pp
);
421 printf(";;\t..END..\n");
424 #endif /* !RFC1535 */
427 if ((cp
= getenv("RES_OPTIONS")) != NULL
)
428 res_setoptions(statp
, cp
, "env");
429 statp
->options
|= RES_INIT
;
435 res_setoptions(res_state statp
, const char *options
, const char *source
) {
436 const char *cp
= options
;
440 if (statp
->options
& RES_DEBUG
)
441 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
445 /* skip leading and inner runs of spaces */
446 while (*cp
== ' ' || *cp
== '\t')
448 /* search for and process individual options */
449 if (!strncmp(cp
, "ndots:", sizeof("ndots:") - 1)) {
450 i
= atoi(cp
+ sizeof("ndots:") - 1);
451 if (i
<= RES_MAXNDOTS
)
454 statp
->ndots
= RES_MAXNDOTS
;
456 if (statp
->options
& RES_DEBUG
)
457 printf(";;\tndots=%d\n", statp
->ndots
);
459 } else if (!strncmp(cp
, "timeout:", sizeof("timeout:") - 1)) {
460 i
= atoi(cp
+ sizeof("timeout:") - 1);
461 if (i
<= RES_MAXRETRANS
)
464 statp
->retrans
= RES_MAXRETRANS
;
465 } else if (!strncmp(cp
, "attempts:", sizeof("attempts:") - 1)){
466 i
= atoi(cp
+ sizeof("attempts:") - 1);
467 if (i
<= RES_MAXRETRY
)
470 statp
->retry
= RES_MAXRETRY
;
471 } else if (!strncmp(cp
, "debug", sizeof("debug") - 1)) {
473 if (!(statp
->options
& RES_DEBUG
)) {
474 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
476 statp
->options
|= RES_DEBUG
;
478 printf(";;\tdebug\n");
480 } else if (!strncmp(cp
, "inet6", sizeof("inet6") - 1)) {
481 statp
->options
|= RES_USE_INET6
;
482 } else if (!strncmp(cp
, "rotate", sizeof("rotate") - 1)) {
483 statp
->options
|= RES_ROTATE
;
484 } else if (!strncmp(cp
, "no-check-names",
485 sizeof("no-check-names") - 1)) {
486 statp
->options
|= RES_NOCHECKNAME
;
488 /* XXX - print a warning here? */
490 /* skip to next run of spaces */
491 while (*cp
&& *cp
!= ' ' && *cp
!= '\t')
497 /* XXX - should really support CIDR which means explicit masks always. */
499 net_mask(in
) /* XXX - should really use system's version of this */
502 register u_int32_t i
= ntohl(in
.s_addr
);
505 return (htonl(IN_CLASSA_NET
));
506 else if (IN_CLASSB(i
))
507 return (htonl(IN_CLASSB_NET
));
508 return (htonl(IN_CLASSC_NET
));
516 __gettimeofday(&now
, NULL
);
517 return (0xffff & (now
.tv_sec
^ now
.tv_usec
^ __getpid()));
521 * This routine is for closing the socket if a virtual circuit is used and
522 * the program wants to close it. This provides support for endhostent()
523 * which expects to close the socket.
525 * This routine is not expected to be user visible.
528 res_nclose(res_state statp
) {
531 if (statp
->_vcsock
>= 0) {
532 (void) __close(statp
->_vcsock
);
534 statp
->_flags
&= ~(RES_F_VC
| RES_F_CONN
);
537 for (ns
= 0; ns
< statp
->_u
._ext
.nscount
+ statp
->_u
._ext
.nscount6
;
540 for (ns
= 0; ns
< statp
->_u
._ext
.nscount
; ns
++)
543 if (statp
->_u
._ext
.nssocks
[ns
] != -1) {
544 (void) __close(statp
->_u
._ext
.nssocks
[ns
]);
545 statp
->_u
._ext
.nssocks
[ns
] = -1;
548 statp
->_u
._ext
.nsinit
= 0;