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- /* $NetBSD: res_init.c,v 1.8 1995/06/03 22:33:36 mycroft Exp $ */
-
- /*-
- * Copyright (c) 1985, 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * -
- * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies, and that
- * the name of Digital Equipment Corporation not be used in advertising or
- * publicity pertaining to distribution of the document or software without
- * specific, written prior permission.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
- * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- * -
- * --Copyright--
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- #if 0
- static char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
- static char rcsid[] = "$Id: res_init.c,v 4.9.1.1 1993/05/02 22:43:03 vixie Rel ";
- #else
- static char rcsid[] = "$NetBSD: res_init.c,v 1.8 1995/06/03 22:33:36 mycroft Exp $";
- #endif
- #endif /* LIBC_SCCS and not lint */
-
- #include <sys/param.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <arpa/nameser.h>
- #include <resolv.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- static void res_setoptions __P((char *, char *));
- static u_int32_t net_mask __P((struct in_addr));
-
-
- /*
- * Set up default settings. If the configuration file exist, the values
- * there will have precedence. Otherwise, the server address is set to
- * INADDR_ANY and the default domain name comes from the gethostname().
- *
- * The configuration file should only be used if you want to redefine your
- * domain or run without a server on your machine.
- *
- * Return 0 if completes successfully, -1 on error
- */
- int res_init()
- {
- register FILE *fp;
- register char *cp, **pp, *net;
- register int n;
- char buf[BUFSIZ], buf2[BUFSIZ];
- int nserv = 0; /* number of nameserver records read from file */
- int haveenv = 0;
- int havesearch = 0;
- int nsort = 0;
-
- _res.nsaddr.sin_len = sizeof(struct sockaddr_in);
- _res.nsaddr.sin_family = AF_INET;
- _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
- #ifdef USELOOPBACK
- _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
- #else
- _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
- #endif
- _res.nscount = 1;
- _res.ndots = 1;
- _res.pfcode = 0;
- strncpy(_res.lookups, "f", sizeof _res.lookups);
-
- /* Allow user to override the local domain definition */
- if ((cp = getenv("LOCALDOMAIN")) != NULL) {
- (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
- if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
- *cp = '\0';
- haveenv++;
-
- /*
- * Set search list to be blank-separated strings
- * from rest of env value. Permits users of LOCALDOMAIN
- * to still have a search list, and anyone to set the
- * one that they want to use as an individual (even more
- * important now that the rfc1535 stuff restricts searches)
- */
- cp = _res.defdname;
- pp = _res.dnsrch;
- *pp++ = cp;
- for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
- if (*cp == '\n') /* silly backwards compat */
- break;
- else if (*cp == ' ' || *cp == '\t') {
- *cp = 0;
- n = 1;
- } else if (n) {
- *pp++ = cp;
- n = 0;
- havesearch = 1;
- }
- }
- /* null terminate last domain if there are excess */
- while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
- cp++;
- *cp = '\0';
- *pp++ = 0;
- }
-
- if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
- strncpy(_res.lookups, "bf", sizeof _res.lookups);
-
- /* read the config file */
- while (fgets(buf, sizeof(buf), fp) != NULL) {
- /* skip comments */
- if ((*buf == ';') || (*buf == '#'))
- continue;
- /* read default domain name */
- if (!strncmp(buf, "domain", sizeof("domain") - 1)) {
- if (haveenv) /* skip if have from environ */
- continue;
- cp = buf + sizeof("domain") - 1;
- while (*cp == ' ' || *cp == '\t')
- cp++;
- if ((*cp == '\0') || (*cp == '\n'))
- continue;
- (void)strncpy(_res.defdname, cp,
- sizeof(_res.defdname) - 1);
- if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
- *cp = '\0';
- havesearch = 0;
- continue;
- }
- /* lookup types */
- if (!strncmp(buf, "lookup", sizeof("lookup") -1)) {
- char *sp = NULL;
-
- bzero(_res.lookups, sizeof _res.lookups);
- cp = buf + sizeof("lookup") - 1;
- for (n = 0;; cp++) {
- if (n == MAXDNSLUS)
- break;
- if ((*cp == '\0') || (*cp == '\n')) {
- if (sp) {
- if (*sp=='y' || *sp=='b' || *sp=='f')
- _res.lookups[n++] = *sp;
- sp = NULL;
- }
- break;
- } else if ((*cp == ' ') || (*cp == '\t') || (*cp == ',')) {
- if (sp) {
- if (*sp=='y' || *sp=='b' || *sp=='f')
- _res.lookups[n++] = *sp;
- sp = NULL;
- }
- } else if (sp == NULL)
- sp = cp;
- }
- continue;
- }
- /* set search list */
- if (!strncmp(buf, "search", sizeof("search") - 1)) {
- if (haveenv) /* skip if have from environ */
- continue;
- cp = buf + sizeof("search") - 1;
- while (*cp == ' ' || *cp == '\t')
- cp++;
- if ((*cp == '\0') || (*cp == '\n'))
- continue;
- (void)strncpy(_res.defdname, cp,
- sizeof(_res.defdname) - 1);
- if ((cp = strchr(_res.defdname, '\n')) != NULL)
- *cp = '\0';
- /*
- * Set search list to be blank-separated strings
- * on rest of line.
- */
- cp = _res.defdname;
- pp = _res.dnsrch;
- *pp++ = cp;
- for (n = 0; *cp && pp < _res.dnsrch + MAXDNSRCH; cp++) {
- if (*cp == ' ' || *cp == '\t') {
- *cp = 0;
- n = 1;
- } else if (n) {
- *pp++ = cp;
- n = 0;
- }
- }
- /* null terminate last domain if there are excess */
- while (*cp != '\0' && *cp != ' ' && *cp != '\t')
- cp++;
- *cp = '\0';
- *pp++ = 0;
- havesearch = 1;
- continue;
- }
- /* read nameservers to query */
- if (!strncmp(buf, "nameserver", sizeof("nameserver") - 1) &&
- nserv < MAXNS) {
- struct in_addr a;
-
- cp = buf + sizeof("nameserver") - 1;
- while (*cp == ' ' || *cp == '\t')
- cp++;
- if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
- _res.nsaddr_list[nserv].sin_len = sizeof(struct sockaddr_in);
- _res.nsaddr_list[nserv].sin_family = AF_INET;
- _res.nsaddr_list[nserv].sin_port =
- htons(NAMESERVER_PORT);
- _res.nsaddr_list[nserv].sin_addr = a;
- nserv++;
- }
- continue;
- }
- if (!strncmp(buf, "sortlist", sizeof("sortlist") - 1)) {
- struct in_addr a;
-
- cp = buf + sizeof("sortlist") - 1;
- while (*cp == ' ' || *cp == '\t')
- cp++;
- while (sscanf(cp,"%[0-9./]s", buf2) && nsort < MAXRESOLVSORT) {
- if ((net = strchr(buf2, '/')))
- *net = '\0';
- if (inet_aton(buf2, &a)) {
- _res.sort_list[nsort].addr = a;
- if (net && inet_aton(net+1, &a)) {
- _res.sort_list[nsort].mask = a.s_addr;
- } else {
- _res.sort_list[nsort].mask =
- net_mask(_res.sort_list[nsort].addr);
- }
- nsort++;
- }
- if (net)
- *net = '/';
- cp += strlen(buf2);
- while (*cp == ' ' || *cp == '\t')
- cp++;
- }
- continue;
- }
- if (!strncmp(buf, "options", sizeof("options") -1)) {
- res_setoptions(buf + sizeof("options") - 1, "conf");
- continue;
- }
- }
- if (nserv > 1)
- _res.nscount = nserv;
- _res.nsort = nsort;
- (void) fclose(fp);
- }
- if (_res.defdname[0] == 0) {
- if (gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
- (cp = strchr(buf, '.')))
- (void)strcpy(_res.defdname, cp + 1);
- }
-
- /* find components of local domain that might be searched */
- if (havesearch == 0) {
- pp = _res.dnsrch;
- *pp++ = _res.defdname;
- #ifndef SEARCH_LOCAL_DOMAINS
- *pp = NULL;
- #else
- for (cp = _res.defdname, n = 0; *cp; cp++)
- if (*cp == '.')
- n++;
- cp = _res.defdname;
- for (; n >= LOCALDOMAINPARTS && pp < _res.dnsrch + MAXDFLSRCH;
- n--) {
- cp = strchr(cp, '.');
- *pp++ = ++cp;
- }
- *pp++ = 0;
- #endif
- }
-
- if ((cp = getenv("RES_OPTIONS")) != NULL)
- res_setoptions(cp, "env");
- _res.options |= RES_INIT;
- return (0);
- }
-
- static void
- res_setoptions(options, source)
- char *options, *source;
- {
- char *cp = options;
- int i;
-
- #ifdef DEBUG
- if (_res.options & RES_DEBUG) {
- printf(";; res_setoptions(\"%s\", \"%s\")...\n",
- options, source);
- }
- #endif
- while (*cp) {
- /* skip leading and inner runs of spaces */
- while (*cp == ' ' || *cp == '\t')
- cp++;
- /* search for and process individual options */
- if (!strncmp(cp, "ndots:", sizeof("ndots:")-1)) {
- i = atoi(cp + sizeof("ndots:") - 1);
- if (i <= RES_MAXNDOTS)
- _res.ndots = i;
- else
- _res.ndots = RES_MAXNDOTS;
- #ifdef DEBUG
- if (_res.options & RES_DEBUG) {
- printf(";;\tndots=%d\n", _res.ndots);
- }
- #endif
- } else if (!strncmp(cp, "debug", sizeof("debug")-1)) {
- #ifdef DEBUG
- if (!(_res.options & RES_DEBUG)) {
- printf(";; res_setoptions(\"%s\", \"%s\")..\n",
- options, source);
- _res.options |= RES_DEBUG;
- }
- printf(";;\tdebug\n");
- #endif
- } else {
- /* XXX - print a warning here? */
- }
- /* skip to next run of spaces */
- while (*cp && *cp != ' ' && *cp != '\t')
- cp++;
- }
- }
-
- static u_int32_t
- net_mask(in) /* XXX - should really use system's version of this */
- struct in_addr in;
- {
- register u_int32_t i = ntohl(in.s_addr);
-
- if (IN_CLASSA(i))
- return (htonl(IN_CLASSA_NET));
- if (IN_CLASSB(i))
- return (htonl(IN_CLASSB_NET));
- return (htonl(IN_CLASSC_NET));
- }
-