NetBSD/lib/libc/net/res_init.c

417 lines
13 KiB
C

/* $NetBSD: res_init.c,v 1.9 1996/02/02 15:22:30 mrg 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[] = "$Id: res_init.c,v 8.3 1995/06/29 09:26:28 vixie Exp ";
#else
static char rcsid[] = "$NetBSD: res_init.c,v 1.9 1996/02/02 15:22:30 mrg 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));
/*
* Resolver state default settings
*/
struct __res_state _res = {
RES_TIMEOUT, /* retransmition time interval */
4, /* number of times to retransmit */
RES_DEFAULT, /* options flags */
1, /* number of name servers */
};
/*
* 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
*/
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;
int dots;
u_long mask;
_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));
}
u_int16_t
res_randomid()
{
struct timeval now;
gettimeofday(&now, NULL);
return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
}