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
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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
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31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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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
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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
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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>
64 #include <netinet/in.h>
65 #include <arpa/inet.h>
66 #include <arpa/nameser.h>
71 #if defined(BSD) && (BSD >= 199103)
76 # include "../conf/portability.h"
79 /*-------------------------------------- info about "sortlist" --------------
80 * Marc Majka 1994/04/16
81 * Allan Nathanson 1994/10/29 (BIND 4.9.3.x)
83 * NetInfo resolver configuration directory support.
85 * Allow a NetInfo directory to be created in the hierarchy which
86 * contains the same information as the resolver configuration file.
88 * - The local domain name is stored as the value of the "domain" property.
89 * - The Internet address(es) of the name server(s) are stored as values
90 * of the "nameserver" property.
91 * - The name server addresses are stored as values of the "nameserver"
93 * - The search list for host-name lookup is stored as values of the
95 * - The sortlist comprised of IP address netmask pairs are stored as
96 * values of the "sortlist" property. The IP address and optional netmask
97 * should be seperated by a slash (/) or ampersand (&) character.
98 * - 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 const char sort_mask[] = "/&";
116 #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
117 static u_int32_t net_mask __P((struct in_addr));
120 #if !defined(isascii) /* XXX - could be a function */
121 # define isascii(c) (!(c & 0200))
125 * Resolver state default settings.
128 struct __res_state _res;
131 * Set up default settings. If the configuration file exist, the values
132 * there will have precedence. Otherwise, the server address is set to
133 * INADDR_ANY and the default domain name comes from the gethostname().
135 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
136 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
137 * since it was noted that INADDR_ANY actually meant ``the first interface
138 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
139 * it had to be "up" in order for you to reach your own name server. It
140 * was later decided that since the recommended practice is to always
141 * install local static routes through 127.0.0.1 for all your network
142 * interfaces, that we could solve this problem without a code change.
144 * The configuration file should always be used, since it is the only way
145 * to specify a default domain. If you are running a server on your local
146 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
147 * in the configuration file.
149 * Return 0 if completes successfully, -1 on error
155 register char *cp, **pp;
158 int nserv = 0; /* number of nameserver records read from file */
170 * These three fields used to be statically initialized. This made
171 * it hard to use this code in a shared library. It is necessary,
172 * now that we're doing dynamic initialization here, that we preserve
173 * the old semantics: if an application modifies one of these three
174 * fields of _res before res_init() is called, res_init() will not
175 * alter them. Of course, if an application is setting them to
176 * _zero_ before calling res_init(), hoping to override what used
177 * to be the static default, we can't detect it and unexpected results
178 * will follow. Zero for any of these fields would make no sense,
179 * so one can safely assume that the applications were already getting
180 * unexpected results.
182 * _res.options is tricky since some apps were known to diddle the bits
183 * before res_init() was first called. We can't replicate that semantic
184 * with dynamic initialization (they may have turned bits off that are
185 * set in RES_DEFAULT). Our solution is to declare such applications
186 * "broken". They could fool us by setting RES_INIT but none do (yet).
189 _res.retrans = RES_TIMEOUT;
192 if (!(_res.options & RES_INIT))
193 _res.options = RES_DEFAULT;
196 * This one used to initialize implicitly to zero, so unless the app
197 * has set it to something in particular, we can randomize it now.
200 _res.id = res_randomid();
203 _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
205 _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
207 _res.nsaddr.sin_family = AF_INET;
208 _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
213 /* Allow user to override the local domain definition */
214 if ((cp = getenv("LOCALDOMAIN")) != NULL) {
215 (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
219 * Set search list to be blank-separated strings
220 * from rest of env value. Permits users of LOCALDOMAIN
221 * to still have a search list, and anyone to set the
222 * one that they want to use as an individual (even more
223 * important now that the rfc1535 stuff restricts searches)
228 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
229 if (*cp == '\n') /* silly backwards compat */
231 else if (*cp == ' ' || *cp == '\t') {
240 /* null terminate last domain if there are excess */
241 while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
247 #define MATCH(line, name) \
248 (!strncmp(line, name, sizeof(name) - 1) && \
249 (line[sizeof(name) - 1] == ' ' || \
250 line[sizeof(name) - 1] == '\t'))
253 if (netinfo_res_init(&haveenv, &havesearch) == 0)
255 if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
256 /* read the config file */
257 while (fgets(buf, sizeof(buf), fp) != NULL) {
259 if (*buf == ';' || *buf == '#')
261 /* read default domain name */
262 if (MATCH(buf, "domain")) {
263 if (haveenv) /* skip if have from environ */
265 cp = buf + sizeof("domain") - 1;
266 while (*cp == ' ' || *cp == '\t')
268 if ((*cp == '\0') || (*cp == '\n'))
270 strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
271 if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
276 /* set search list */
277 if (MATCH(buf, "search")) {
278 if (haveenv) /* skip if have from environ */
280 cp = buf + sizeof("search") - 1;
281 while (*cp == ' ' || *cp == '\t')
283 if ((*cp == '\0') || (*cp == '\n'))
285 strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
286 if ((cp = strchr(_res.defdname, '\n')) != NULL)
289 * Set search list to be blank-separated strings
295 for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
296 if (*cp == ' ' || *cp == '\t') {
304 /* null terminate last domain if there are excess */
305 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
312 /* read nameservers to query */
313 if (MATCH(buf, "nameserver") && nserv < MAXNS) {
316 cp = buf + sizeof("nameserver") - 1;
317 while (*cp == ' ' || *cp == '\t')
319 if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
320 _res.nsaddr_list[nserv].sin_addr = a;
321 _res.nsaddr_list[nserv].sin_family = AF_INET;
322 _res.nsaddr_list[nserv].sin_port =
323 htons(NAMESERVER_PORT);
329 if (MATCH(buf, "sortlist")) {
332 cp = buf + sizeof("sortlist") - 1;
333 while (nsort < MAXRESOLVSORT) {
334 while (*cp == ' ' || *cp == '\t')
336 if (*cp == '\0' || *cp == '\n' || *cp == ';')
339 while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
340 isascii(*cp) && !isspace(*cp))
344 if (inet_aton(net, &a)) {
345 _res.sort_list[nsort].addr = a;
349 while (*cp && *cp != ';' &&
350 isascii(*cp) && !isspace(*cp))
354 if (inet_aton(net, &a)) {
355 _res.sort_list[nsort].mask = a.s_addr;
357 _res.sort_list[nsort].mask =
358 net_mask(_res.sort_list[nsort].addr);
361 _res.sort_list[nsort].mask =
362 net_mask(_res.sort_list[nsort].addr);
371 if (MATCH(buf, "options")) {
372 res_setoptions(buf + sizeof("options") - 1, "conf");
377 _res.nscount = nserv;
383 if (_res.defdname[0] == 0 &&
384 gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
385 (cp = strchr(buf, '.')) != NULL)
386 strcpy(_res.defdname, cp + 1);
388 /* find components of local domain that might be searched */
389 if (havesearch == 0) {
391 *pp++ = _res.defdname;
396 for (cp = _res.defdname; *cp; cp++)
397 dots += (*cp == '.');
400 while (pp < _res.dnsrch + MAXDFLSRCH) {
401 if (dots < LOCALDOMAINPARTS)
403 cp = strchr(cp, '.') + 1; /* we know there is one */
409 if (_res.options & RES_DEBUG) {
410 printf(";; res_init()... default dnsrch list:\n");
411 for (pp = _res.dnsrch; *pp; pp++)
412 printf(";;\t%s\n", *pp);
413 printf(";;\t..END..\n");
416 #endif /* !RFC1535 */
419 if ((cp = getenv("RES_OPTIONS")) != NULL)
420 res_setoptions(cp, "env");
421 _res.options |= RES_INIT;
426 res_setoptions(options, source)
427 char *options, *source;
433 if (_res.options & RES_DEBUG)
434 printf(";; res_setoptions(\"%s\", \"%s\")...\n",
438 /* skip leading and inner runs of spaces */
439 while (*cp == ' ' || *cp == '\t')
441 /* search for and process individual options */
442 if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
443 i = atoi(cp + sizeof("ndots:") - 1);
444 if (i <= RES_MAXNDOTS)
447 _res.ndots = RES_MAXNDOTS;
449 if (_res.options & RES_DEBUG)
450 printf(";;\tndots=%d\n", _res.ndots);
452 } else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
454 if (!(_res.options & RES_DEBUG)) {
455 printf(";; res_setoptions(\"%s\", \"%s\")..\n",
457 _res.options |= RES_DEBUG;
459 printf(";;\tdebug\n");
462 /* XXX - print a warning here? */
464 /* skip to next run of spaces */
465 while (*cp && *cp != ' ' && *cp != '\t')
471 /* XXX - should really support CIDR which means explicit masks always. */
473 net_mask(in) /* XXX - should really use system's version of this */
476 register u_int32_t i = ntohl(in.s_addr);
479 return (htonl(IN_CLASSA_NET));
480 else if (IN_CLASSB(i))
481 return (htonl(IN_CLASSB_NET));
482 return (htonl(IN_CLASSC_NET));
488 netinfo_res_init(haveenv, havesearch)
493 void *domain, *parent;
502 status = ni_open(NULL, ".", &domain);
503 if (status == NI_OK) {
504 ni_setreadtimeout(domain, NI_TIMEOUT);
505 ni_setabort(domain, 1);
507 /* climb the NetInfo hierarchy to find a resolver directory */
508 while (status == NI_OK) {
509 status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
510 if (status == NI_OK) {
511 /* found a resolver directory */
514 /* get the default domain name */
515 status = ni_lookupprop(domain, &dir, "domain", &nl);
516 if (status == NI_OK && nl.ni_namelist_len > 0) {
517 (void)strncpy(_res.defdname,
518 nl.ni_namelist_val[0],
519 sizeof(_res.defdname) - 1);
520 _res.defdname[sizeof(_res.defdname) - 1] = '\0';
521 ni_namelist_free(&nl);
525 /* get search list */
526 status = ni_lookupprop(domain, &dir, "search", &nl);
527 if (status == NI_OK && nl.ni_namelist_len > 0) {
528 (void)strncpy(_res.defdname,
529 nl.ni_namelist_val[0],
530 sizeof(_res.defdname) - 1);
531 _res.defdname[sizeof(_res.defdname) - 1] = '\0';
534 n < nl.ni_namelist_len && n < MAXDNSRCH;
536 /* duplicate up to MAXDNSRCH servers */
537 char *cp = nl.ni_namelist_val[n];
539 strcpy((char *)malloc(strlen(cp) + 1), cp);
541 ni_namelist_free(&nl);
546 /* get list of nameservers */
547 status = ni_lookupprop(domain, &dir, "nameserver", &nl);
548 if (status == NI_OK && nl.ni_namelist_len > 0) {
549 /* copy up to MAXNS servers */
551 n < nl.ni_namelist_len && nserv < MAXNS;
555 if (inet_aton(nl.ni_namelist_val[n], &a)) {
556 _res.nsaddr_list[nserv].sin_addr = a;
557 _res.nsaddr_list[nserv].sin_family = AF_INET;
558 _res.nsaddr_list[nserv].sin_port =
559 htons(NAMESERVER_PORT);
563 ni_namelist_free(&nl);
567 _res.nscount = nserv;
571 status = ni_lookupprop(domain, &dir, "sortlist", &nl);
572 if (status == NI_OK && nl.ni_namelist_len > 0) {
574 /* copy up to MAXRESOLVSORT address/netmask pairs */
576 n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
584 for (sp = sort_mask; *sp; sp++) {
586 cp1 = strchr(nl.ni_namelist_val[n], *sp);
588 cp = (cp < cp1)? cp : cp1;
597 if (inet_aton(nl.ni_namelist_val[n], &a)) {
598 _res.sort_list[nsort].addr = a;
599 if (*cp && ISSORTMASK(ch)) {
601 if (inet_aton(cp, &a)) {
602 _res.sort_list[nsort].mask = a.s_addr;
604 _res.sort_list[nsort].mask =
605 net_mask(_res.sort_list[nsort].addr);
608 _res.sort_list[nsort].mask =
609 net_mask(_res.sort_list[nsort].addr);
614 ni_namelist_free(&nl);
620 /* get resolver options */
621 status = ni_lookupprop(domain, &dir, "options", &nl);
622 if (status == NI_OK && nl.ni_namelist_len > 0) {
623 res_setoptions(nl.ni_namelist_val[0], "conf");
624 ni_namelist_free(&nl);
628 return(1); /* using DNS configuration from NetInfo */
631 status = ni_open(domain, "..", &parent);
637 return(0); /* if not using DNS configuration from NetInfo */
646 gettimeofday(&now, NULL);
647 return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));