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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /resolv/res_init.c
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initial import
Diffstat (limited to 'resolv/res_init.c')
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diff --git a/resolv/res_init.c b/resolv/res_init.c
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+/*
+ * ++Copyright++ 1985, 1989, 1993
+ * -
+ * 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)
+static char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
+static char rcsid[] = "$Id$";
+#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 <stdio.h>
+#include <ctype.h>
+#include <resolv.h>
+#if defined(BSD) && (BSD >= 199103)
+# include <unistd.h>
+# include <stdlib.h>
+# include <string.h>
+#else
+# include "../conf/portability.h"
+#endif
+
+/*
+ * Marc Majka 1994/04/16
+ * Allan Nathanson 1994/10/29 (BIND 4.9.3.x)
+ *
+ * NetInfo resolver configuration directory support.
+ *
+ * Allow a NetInfo directory to be created in the hierarchy which
+ * contains the same information as the resolver configuration file.
+ *
+ * - The local domain name is stored as the value of the "domain" property.
+ * - The Internet address(es) of the name server(s) are stored as values
+ * of the "nameserver" property.
+ * - The name server addresses are stored as values of the "nameserver"
+ * property.
+ * - The search list for host-name lookup is stored as values of the
+ * "search" property.
+ * - The sortlist comprised of IP address netmask pairs are stored as
+ * values of the "sortlist" property. The IP address and optional netmask
+ * should be seperated by a slash (/) character.
+ * - Internal resolver variables can be set from the value of the "options"
+ * property.
+ *
+ */
+#if defined(NeXT)
+# include <netinfo/ni.h>
+# define NI_PATH_RESCONF "/locations/resolver"
+# define NI_TIMEOUT 10
+static int netinfo_res_init __P((int *haveenv, int *havesearch));
+#endif
+
+#if defined(USE_OPTIONS_H)
+# include "../conf/options.h"
+#endif
+
+static void res_setoptions __P((char *, char *));
+
+#ifdef RESOLVSORT
+static u_int32_t net_mask __P((struct in_addr));
+#endif
+
+#if !defined(isascii) /* XXX - could be a function */
+# define isascii(c) (!(c & 0200))
+#endif
+
+/*
+ * Resolver state default settings.
+ */
+
+struct __res_state _res;
+
+/*
+ * 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().
+ *
+ * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
+ * rather than INADDR_ANY ("0.0.0.0") as the default name server address
+ * since it was noted that INADDR_ANY actually meant ``the first interface
+ * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
+ * it had to be "up" in order for you to reach your own name server. It
+ * was later decided that since the recommended practice is to always
+ * install local static routes through 127.0.0.1 for all your network
+ * interfaces, that we could solve this problem without a code change.
+ *
+ * The configuration file should always be used, since it is the only way
+ * to specify a default domain. If you are running a server on your local
+ * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
+ * in the configuration file.
+ *
+ * Return 0 if completes successfully, -1 on error
+ */
+res_init()
+{
+ register FILE *fp;
+ register char *cp, **pp;
+ register int n, dots;
+ char buf[BUFSIZ];
+ int nserv = 0; /* number of nameserver records read from file */
+ int haveenv = 0;
+ int havesearch = 0;
+#ifdef RESOLVSORT
+ int nsort = 0;
+ char *net;
+#endif
+
+ /*
+ * These three fields used to be statically initialized. This made
+ * it hard to use this code in a shared library. It is necessary,
+ * now that we're doing dynamic initialization here, that we preserve
+ * the old semantics: if an application modifies one of these three
+ * fields of _res before res_init() is called, res_init() will not
+ * alter them. Of course, if an application is setting them to
+ * _zero_ before calling res_init(), hoping to override what used
+ * to be the static default, we can't detect it and unexpected results
+ * will follow. Zero for any of these fields would make no sense,
+ * so one can safely assume that the applications were already getting
+ * unexpected results.
+ */
+ if (!_res.retrans)
+ _res.retrans = RES_TIMEOUT;
+ if (!_res.retry)
+ _res.retry = 4;
+ if (!_res.options)
+ _res.options = RES_DEFAULT;
+
+#ifdef USELOOPBACK
+ _res.nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
+#else
+ _res.nsaddr.sin_addr.s_addr = INADDR_ANY;
+#endif
+ _res.nsaddr.sin_family = AF_INET;
+ _res.nsaddr.sin_port = htons(NAMESERVER_PORT);
+ _res.nscount = 1;
+ _res.ndots = 1;
+ _res.pfcode = 0;
+
+ /* Allow user to override the local domain definition */
+ if ((cp = getenv("LOCALDOMAIN")) != NULL) {
+ (void)strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
+ 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;
+ }
+
+#define MATCH(line, name) \
+ (!strncmp(line, name, sizeof(name) - 1) && \
+ (line[sizeof(name) - 1] == ' ' || \
+ line[sizeof(name) - 1] == '\t'))
+
+#ifdef NeXT
+ if (netinfo_res_init(&haveenv, &havesearch) == 0)
+#endif
+ if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
+ /* read the config file */
+ while (fgets(buf, sizeof(buf), fp) != NULL) {
+ /* skip comments */
+ if (*buf == ';' || *buf == '#')
+ continue;
+ /* read default domain name */
+ if (MATCH(buf, "domain")) {
+ if (haveenv) /* skip if have from environ */
+ continue;
+ cp = buf + sizeof("domain") - 1;
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ if ((*cp == '\0') || (*cp == '\n'))
+ continue;
+ strncpy(_res.defdname, cp, sizeof(_res.defdname) - 1);
+ if ((cp = strpbrk(_res.defdname, " \t\n")) != NULL)
+ *cp = '\0';
+ havesearch = 0;
+ continue;
+ }
+ /* set search list */
+ if (MATCH(buf, "search")) {
+ if (haveenv) /* skip if have from environ */
+ continue;
+ cp = buf + sizeof("search") - 1;
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ if ((*cp == '\0') || (*cp == '\n'))
+ continue;
+ 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 (MATCH(buf, "nameserver") && 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_addr = a;
+ _res.nsaddr_list[nserv].sin_family = AF_INET;
+ _res.nsaddr_list[nserv].sin_port =
+ htons(NAMESERVER_PORT);
+ nserv++;
+ }
+ continue;
+ }
+#ifdef RESOLVSORT
+ if (MATCH(buf, "sortlist")) {
+ struct in_addr a;
+
+ cp = buf + sizeof("sortlist") - 1;
+ while (nsort < MAXRESOLVSORT) {
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ if (*cp == '\0' || *cp == '\n' || *cp == ';')
+ break;
+ net = cp;
+ while (*cp && *cp != '/' &&
+ isascii(*cp) && !isspace(*cp))
+ cp++;
+ n = *cp;
+ *cp = 0;
+ if (inet_aton(net, &a)) {
+ _res.sort_list[nsort].addr = a;
+ if (n == '/') {
+ *cp++ = n;
+ net = cp;
+ while (*cp && isascii(*cp) && !isspace(*cp))
+ cp++;
+ n = *cp;
+ *cp = 0;
+ if (inet_aton(net, &a)) {
+ _res.sort_list[nsort].mask = a.s_addr;
+ } else {
+ _res.sort_list[nsort].mask =
+ net_mask(_res.sort_list[nsort].addr);
+ }
+ } else {
+ _res.sort_list[nsort].mask =
+ net_mask(_res.sort_list[nsort].addr);
+ }
+ nsort++;
+ }
+ *cp++ = n;
+ }
+ continue;
+ }
+#endif
+ if (MATCH(buf, "options")) {
+ res_setoptions(buf + sizeof("options") - 1, "conf");
+ continue;
+ }
+ }
+ if (nserv > 1)
+ _res.nscount = nserv;
+#ifdef RESOLVSORT
+ _res.nsort = nsort;
+#endif
+ (void) fclose(fp);
+ }
+ if (_res.defdname[0] == 0 &&
+ gethostname(buf, sizeof(_res.defdname) - 1) == 0 &&
+ (cp = strchr(buf, '.')) != NULL)
+ strcpy(_res.defdname, cp + 1);
+
+ /* find components of local domain that might be searched */
+ if (havesearch == 0) {
+ pp = _res.dnsrch;
+ *pp++ = _res.defdname;
+ *pp = NULL;
+
+#ifndef RFC1535
+ dots = 0;
+ for (cp = _res.defdname; *cp; cp++)
+ dots += (*cp == '.');
+
+ cp = _res.defdname;
+ while (pp < _res.dnsrch + MAXDFLSRCH) {
+ if (dots < LOCALDOMAINPARTS)
+ break;
+ cp = strchr(cp, '.') + 1; /* we know there is one */
+ *pp++ = cp;
+ dots--;
+ }
+ *pp = NULL;
+#ifdef DEBUG
+ if (_res.options & RES_DEBUG) {
+ printf(";; res_init()... default dnsrch list:\n");
+ for (pp = _res.dnsrch; *pp; pp++)
+ printf(";;\t%s\n", *pp);
+ printf(";;\t..END..\n");
+ }
+#endif /* DEBUG */
+#endif /* !RFC1535 */
+ }
+
+ 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++;
+ }
+}
+
+#ifdef RESOLVSORT
+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));
+ else if (IN_CLASSB(i))
+ return (htonl(IN_CLASSB_NET));
+ return (htonl(IN_CLASSC_NET));
+}
+#endif
+
+#ifdef NeXT
+static int
+netinfo_res_init(haveenv, havesearch)
+ int *haveenv;
+ int *havesearch;
+{
+ register int n;
+ void *domain, *parent;
+ ni_id dir;
+ ni_status status;
+ ni_namelist nl;
+ int nserv = 0;
+#ifdef RESOLVSORT
+ int nsort = 0;
+#endif
+
+ status = ni_open(NULL, ".", &domain);
+ if (status == NI_OK) {
+ ni_setreadtimeout(domain, NI_TIMEOUT);
+ ni_setabort(domain, 1);
+
+ /* climb the NetInfo hierarchy to find a resolver directory */
+ while (status == NI_OK) {
+ status = ni_pathsearch(domain, &dir, NI_PATH_RESCONF);
+ if (status == NI_OK) {
+ /* found a resolver directory */
+
+ if (*haveenv == 0) {
+ /* get the default domain name */
+ status = ni_lookupprop(domain, &dir, "domain", &nl);
+ if (status == NI_OK && nl.ni_namelist_len > 0) {
+ (void)strncpy(_res.defdname,
+ nl.ni_namelist_val[0],
+ sizeof(_res.defdname) - 1);
+ _res.defdname[sizeof(_res.defdname) - 1] = '\0';
+ ni_namelist_free(&nl);
+ *havesearch = 0;
+ }
+
+ /* get search list */
+ status = ni_lookupprop(domain, &dir, "search", &nl);
+ if (status == NI_OK && nl.ni_namelist_len > 0) {
+ (void)strncpy(_res.defdname,
+ nl.ni_namelist_val[0],
+ sizeof(_res.defdname) - 1);
+ _res.defdname[sizeof(_res.defdname) - 1] = '\0';
+ /* copy */
+ for (n = 0;
+ n < nl.ni_namelist_len && n < MAXDNSRCH;
+ n++) {
+ /* duplicate up to MAXDNSRCH servers */
+ char *cp = nl.ni_namelist_val[n];
+ _res.dnsrch[n] =
+ strcpy((char *)malloc(strlen(cp) + 1), cp);
+ }
+ ni_namelist_free(&nl);
+ *havesearch = 1;
+ }
+ }
+
+ /* get list of nameservers */
+ status = ni_lookupprop(domain, &dir, "nameserver", &nl);
+ if (status == NI_OK && nl.ni_namelist_len > 0) {
+ /* copy up to MAXNS servers */
+ for (n = 0;
+ n < nl.ni_namelist_len && nserv < MAXNS;
+ n++) {
+ struct in_addr a;
+
+ if (inet_aton(nl.ni_namelist_val[n], &a)) {
+ _res.nsaddr_list[nserv].sin_addr = a;
+ _res.nsaddr_list[nserv].sin_family = AF_INET;
+ _res.nsaddr_list[nserv].sin_port =
+ htons(NAMESERVER_PORT);
+ nserv++;
+ }
+ }
+ ni_namelist_free(&nl);
+ }
+
+ if (nserv > 1)
+ _res.nscount = nserv;
+
+#ifdef RESOLVSORT
+ /* get sort order */
+ status = ni_lookupprop(domain, &dir, "sortlist", &nl);
+ if (status == NI_OK && nl.ni_namelist_len > 0) {
+
+ /* copy up to MAXRESOLVSORT address/netmask pairs */
+ for (n = 0;
+ n < nl.ni_namelist_len && nsort < MAXRESOLVSORT;
+ n++) {
+ char ch;
+ char *cp;
+ struct in_addr a;
+
+ cp = strchr(nl.ni_namelist_val[n], '/');
+ if (cp != NULL) {
+ ch = *cp;
+ *cp = '\0';
+ }
+
+ if (inet_aton(nl.ni_namelist_val[n], &a)) {
+ _res.sort_list[nsort].addr = a;
+ if (*cp && ch == '/') {
+ *cp++ = ch;
+ if (inet_aton(cp, &a)) {
+ _res.sort_list[nsort].mask = a.s_addr;
+ } else {
+ _res.sort_list[nsort].mask =
+ net_mask(_res.sort_list[nsort].addr);
+ }
+ } else {
+ _res.sort_list[nsort].mask =
+ net_mask(_res.sort_list[nsort].addr);
+ }
+ nsort++;
+ }
+ }
+ ni_namelist_free(&nl);
+ }
+
+ _res.nsort = nsort;
+#endif
+
+ /* get resolver options */
+ status = ni_lookupprop(domain, &dir, "options", &nl);
+ if (status == NI_OK && nl.ni_namelist_len > 0) {
+ res_setoptions(nl.ni_namelist_val[0], "conf");
+ ni_namelist_free(&nl);
+ }
+
+ ni_free(domain);
+ return(1); /* using DNS configuration from NetInfo */
+ }
+
+ status = ni_open(domain, "..", &parent);
+ ni_free(domain);
+ if (status == NI_OK)
+ domain = parent;
+ }
+ }
+ return(0); /* if not using DNS configuration from NetInfo */
+}
+#endif /* NeXT */