487 lines
15 KiB
C
487 lines
15 KiB
C
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/*
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* Copyright (c) 1985, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
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static const char rcsid[] = "$Id: res_init.c,v 1.4.2.1 2001/06/22 02:57:54 mellon Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "minires/minires.h"
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#include "arpa/nameser.h"
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/* Options. Should all be left alone. */
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#define RESOLVSORT
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#define RFC1535
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#define DEBUG
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static void res_setoptions (res_state, const char *, const char *);
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#ifdef RESOLVSORT
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static const char sort_mask[] = "/&";
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#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
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static u_int32_t net_mask (struct in_addr);
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#endif
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#if !defined(isascii) /* XXX - could be a function */
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# define isascii(c) (!(c & 0200))
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#endif
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/*
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* Resolver state default settings.
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*/
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/*
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* Set up default settings. If the configuration file exist, the values
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* there will have precedence. Otherwise, the server address is set to
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* INADDR_ANY and the default domain name comes from the gethostname().
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*
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* An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
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* rather than INADDR_ANY ("0.0.0.0") as the default name server address
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* since it was noted that INADDR_ANY actually meant ``the first interface
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* you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
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* it had to be "up" in order for you to reach your own name server. It
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* was later decided that since the recommended practice is to always
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* install local static routes through 127.0.0.1 for all your network
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* interfaces, that we could solve this problem without a code change.
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*
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* The configuration file should always be used, since it is the only way
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* to specify a default domain. If you are running a server on your local
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* machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
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* in the configuration file.
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*
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* Return 0 if completes successfully, -1 on error
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*/
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extern int minires_vinit(res_state, int);
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#if defined (TRACING)
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u_int trace_mr_res_randomid(u_int);
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#endif
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int
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res_ninit(res_state statp) {
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return (minires_vinit(statp, 0));
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}
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/* This function has to be reachable by res_data.c but not publically. */
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int
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minires_vinit(res_state statp, int preinit) {
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register FILE *fp;
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register char *cp, **pp;
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register int n;
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char buf[BUFSIZ];
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int nserv = 0; /* number of nameserver records read from file */
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int haveenv = 0;
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int havesearch = 0;
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#ifdef RESOLVSORT
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int nsort = 0;
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char *net;
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#endif
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#ifndef RFC1535
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int dots;
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#endif
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if (!preinit) {
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statp->retrans = RES_TIMEOUT;
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statp->retry = RES_DFLRETRY;
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statp->options = RES_DEFAULT;
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statp->id = res_randomid();
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#if defined (TRACING)
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statp->id = trace_mr_res_randomid (statp -> id);
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#endif
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}
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#ifdef USELOOPBACK
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statp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
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#else
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statp->nsaddr.sin_addr.s_addr = INADDR_ANY;
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#endif
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statp->nsaddr.sin_family = AF_INET;
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statp->nsaddr.sin_port = htons(NAMESERVER_PORT);
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statp->nscount = 1;
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statp->ndots = 1;
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statp->pfcode = 0;
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statp->_sock = -1;
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statp->_flags = 0;
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statp->qhook = NULL;
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statp->rhook = NULL;
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/* Allow user to override the local domain definition */
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if ((cp = getenv("LOCALDOMAIN")) != NULL) {
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(void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
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statp->defdname[sizeof(statp->defdname) - 1] = '\0';
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haveenv++;
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/*
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* Set search list to be blank-separated strings
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* from rest of env value. Permits users of LOCALDOMAIN
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* to still have a search list, and anyone to set the
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* one that they want to use as an individual (even more
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* important now that the rfc1535 stuff restricts searches)
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*/
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cp = statp->defdname;
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pp = statp->dnsrch;
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*pp++ = cp;
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for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
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if (*cp == '\n') /* silly backwards compat */
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break;
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else if (*cp == ' ' || *cp == '\t') {
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*cp = 0;
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n = 1;
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} else if (n) {
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*pp++ = cp;
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n = 0;
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havesearch = 1;
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}
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}
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/* null terminate last domain if there are excess */
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while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
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cp++;
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*cp = '\0';
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*pp++ = 0;
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}
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#define MATCH(line, name) \
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(!strncmp(line, name, sizeof(name) - 1) && \
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(line[sizeof(name) - 1] == ' ' || \
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line[sizeof(name) - 1] == '\t'))
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if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
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/* read the config file */
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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/* skip comments */
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if (*buf == ';' || *buf == '#')
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continue;
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/* read default domain name */
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if (MATCH(buf, "domain")) {
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if (haveenv) /* skip if have from environ */
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continue;
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cp = buf + sizeof("domain") - 1;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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if ((*cp == '\0') || (*cp == '\n'))
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continue;
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strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
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statp->defdname[sizeof(statp->defdname) - 1] = '\0';
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if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
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*cp = '\0';
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havesearch = 0;
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continue;
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}
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/* set search list */
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if (MATCH(buf, "search")) {
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if (haveenv) /* skip if have from environ */
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continue;
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cp = buf + sizeof("search") - 1;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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if ((*cp == '\0') || (*cp == '\n'))
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continue;
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strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
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statp->defdname[sizeof(statp->defdname) - 1] = '\0';
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if ((cp = strchr(statp->defdname, '\n')) != NULL)
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*cp = '\0';
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/*
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* Set search list to be blank-separated strings
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* on rest of line.
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*/
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cp = statp->defdname;
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pp = statp->dnsrch;
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*pp++ = cp;
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for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
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if (*cp == ' ' || *cp == '\t') {
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*cp = 0;
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n = 1;
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} else if (n) {
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*pp++ = cp;
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n = 0;
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}
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}
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/* null terminate last domain if there are excess */
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while (*cp != '\0' && *cp != ' ' && *cp != '\t')
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cp++;
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*cp = '\0';
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*pp++ = 0;
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havesearch = 1;
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continue;
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}
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/* read nameservers to query */
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if (MATCH(buf, "nameserver") && nserv < MAXNS) {
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struct in_addr a;
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cp = buf + sizeof("nameserver") - 1;
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while (*cp == ' ' || *cp == '\t')
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cp++;
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if ((*cp != '\0') && (*cp != '\n') && inet_aton(cp, &a)) {
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statp->nsaddr_list[nserv].sin_addr = a;
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statp->nsaddr_list[nserv].sin_family = AF_INET;
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statp->nsaddr_list[nserv].sin_port =
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htons(NAMESERVER_PORT);
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nserv++;
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}
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continue;
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}
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#ifdef RESOLVSORT
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if (MATCH(buf, "sortlist")) {
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struct in_addr a;
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cp = buf + sizeof("sortlist") - 1;
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while (nsort < MAXRESOLVSORT) {
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while (*cp == ' ' || *cp == '\t')
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cp++;
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if (*cp == '\0' || *cp == '\n' || *cp == ';')
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break;
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net = cp;
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while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
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isascii(*cp) && !isspace(*cp))
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cp++;
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n = *cp;
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*cp = 0;
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if (inet_aton(net, &a)) {
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statp->sort_list[nsort].addr = a;
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if (ISSORTMASK(n)) {
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*cp++ = n;
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net = cp;
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while (*cp && *cp != ';' &&
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isascii(*cp) && !isspace(*cp))
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cp++;
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n = *cp;
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*cp = 0;
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if (inet_aton(net, &a)) {
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statp->sort_list[nsort].mask = a.s_addr;
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} else {
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statp->sort_list[nsort].mask =
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net_mask(statp->sort_list[nsort].addr);
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}
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} else {
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statp->sort_list[nsort].mask =
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net_mask(statp->sort_list[nsort].addr);
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}
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nsort++;
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}
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*cp = n;
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}
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continue;
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}
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#endif
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if (MATCH(buf, "options")) {
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res_setoptions(statp, buf + sizeof("options") - 1, "conf");
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continue;
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}
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}
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if (nserv > 1)
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statp->nscount = nserv;
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#ifdef RESOLVSORT
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||
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|
statp->nsort = nsort;
|
||
|
|
#endif
|
||
|
|
(void) fclose(fp);
|
||
|
|
}
|
||
|
|
if (statp->defdname[0] == 0 &&
|
||
|
|
gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
|
||
|
|
(cp = strchr(buf, '.')) != NULL)
|
||
|
|
strcpy(statp->defdname, cp + 1);
|
||
|
|
|
||
|
|
/* find components of local domain that might be searched */
|
||
|
|
if (havesearch == 0) {
|
||
|
|
pp = statp->dnsrch;
|
||
|
|
*pp++ = statp->defdname;
|
||
|
|
*pp = NULL;
|
||
|
|
|
||
|
|
#ifndef RFC1535
|
||
|
|
dots = 0;
|
||
|
|
for (cp = statp->defdname; *cp; cp++)
|
||
|
|
dots += (*cp == '.');
|
||
|
|
|
||
|
|
cp = statp->defdname;
|
||
|
|
while (pp < statp->dnsrch + MAXDFLSRCH) {
|
||
|
|
if (dots < LOCALDOMAINPARTS)
|
||
|
|
break;
|
||
|
|
cp = strchr(cp, '.') + 1; /* we know there is one */
|
||
|
|
*pp++ = cp;
|
||
|
|
dots--;
|
||
|
|
}
|
||
|
|
*pp = NULL;
|
||
|
|
#ifdef DEBUG
|
||
|
|
if (statp->options & RES_DEBUG) {
|
||
|
|
printf(";; res_init()... default dnsrch list:\n");
|
||
|
|
for (pp = statp->dnsrch; *pp; pp++)
|
||
|
|
printf(";;\t%s\n", *pp);
|
||
|
|
printf(";;\t..END..\n");
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#endif /* !RFC1535 */
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((cp = getenv("RES_OPTIONS")) != NULL)
|
||
|
|
res_setoptions(statp, cp, "env");
|
||
|
|
statp->options |= RES_INIT;
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
res_setoptions(res_state statp, const char *options, const char *source) {
|
||
|
|
const char *cp = options;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
#ifdef DEBUG
|
||
|
|
if (statp->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)
|
||
|
|
statp->ndots = i;
|
||
|
|
else
|
||
|
|
statp->ndots = RES_MAXNDOTS;
|
||
|
|
#ifdef DEBUG
|
||
|
|
if (statp->options & RES_DEBUG)
|
||
|
|
printf(";;\tndots=%d\n", statp->ndots);
|
||
|
|
#endif
|
||
|
|
} else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
|
||
|
|
i = atoi(cp + sizeof("timeout:") - 1);
|
||
|
|
if (i <= RES_MAXRETRANS)
|
||
|
|
statp->retrans = i;
|
||
|
|
else
|
||
|
|
statp->retrans = RES_MAXRETRANS;
|
||
|
|
} else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
|
||
|
|
i = atoi(cp + sizeof("attempts:") - 1);
|
||
|
|
if (i <= RES_MAXRETRY)
|
||
|
|
statp->retry = i;
|
||
|
|
else
|
||
|
|
statp->retry = RES_MAXRETRY;
|
||
|
|
} else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
|
||
|
|
#ifdef DEBUG
|
||
|
|
if (!(statp->options & RES_DEBUG)) {
|
||
|
|
printf(";; res_setoptions(\"%s\", \"%s\")..\n",
|
||
|
|
options, source);
|
||
|
|
statp->options |= RES_DEBUG;
|
||
|
|
}
|
||
|
|
printf(";;\tdebug\n");
|
||
|
|
#endif
|
||
|
|
} else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
|
||
|
|
statp->options |= RES_USE_INET6;
|
||
|
|
} else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
|
||
|
|
statp->options |= RES_ROTATE;
|
||
|
|
} else if (!strncmp(cp, "no-check-names",
|
||
|
|
sizeof("no-check-names") - 1)) {
|
||
|
|
statp->options |= RES_NOCHECKNAME;
|
||
|
|
} else {
|
||
|
|
/* XXX - print a warning here? */
|
||
|
|
}
|
||
|
|
/* skip to next run of spaces */
|
||
|
|
while (*cp && *cp != ' ' && *cp != '\t')
|
||
|
|
cp++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef RESOLVSORT
|
||
|
|
/* XXX - should really support CIDR which means explicit masks always. */
|
||
|
|
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
|
||
|
|
|
||
|
|
u_int
|
||
|
|
res_randomid(void) {
|
||
|
|
struct timeval now;
|
||
|
|
|
||
|
|
gettimeofday(&now, NULL);
|
||
|
|
return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
|
||
|
|
}
|