170 lines
5.3 KiB
C
170 lines
5.3 KiB
C
#if !defined(lint) && !defined(SABER)
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static char sccsid[] = "@(#)ns_sort.c 4.10 (Berkeley) 3/3/91";
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static char rcsid[] = "$Id: ns_sort.c,v 1.2 1995/05/30 03:48:59 rgrimes Exp $";
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#endif /* not lint */
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/*
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* ++Copyright++ 1986, 1990
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* -
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* Copyright (c) 1986, 1990
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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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* 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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* --Copyright--
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <resolv.h>
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#include "named.h"
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static int sort_rr __P((u_char *cp, int count, struct netinfo *ntp, u_char *eom));
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struct netinfo *
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local(from)
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struct sockaddr_in *from;
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{
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struct netinfo *ntp;
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if (from->sin_addr.s_addr == netloop.my_addr.s_addr)
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return (&netloop);
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for (ntp = nettab; ntp != *enettab; ntp = ntp->next) {
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if (ntp->addr == (from->sin_addr.s_addr & ntp->mask))
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return (ntp);
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}
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return (NULL);
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}
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void
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sort_response(cp, ancount, lp, eom)
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register u_char *cp;
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register int ancount;
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struct netinfo *lp;
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u_char *eom;
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{
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register struct netinfo *ntp;
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dprintf(3, (ddt, "sort_response(%d)\n", ancount));
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if (ancount > 1) {
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if (sort_rr(cp, ancount, lp, eom))
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return;
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for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
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if ((ntp->addr == lp->addr) && (ntp->mask == lp->mask))
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continue;
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if (sort_rr(cp, ancount, ntp, eom))
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break;
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}
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}
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}
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static int
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sort_rr(cp, count, ntp, eom)
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register u_char *cp;
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int count;
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register struct netinfo *ntp;
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u_char *eom;
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{
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int type, class, dlen, n, c;
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struct in_addr inaddr;
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u_char *rr1;
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#ifdef DEBUG
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if (debug > 2) {
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inaddr.s_addr = ntp->addr;
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fprintf(ddt, "sort_rr(%#lx, %d, [%s])\n",
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(u_long)cp, count, inet_ntoa(inaddr));
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}
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#endif
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rr1 = NULL;
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for (c = count; c > 0; --c) {
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n = dn_skipname(cp, eom);
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if (n < 0)
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return (1); /* bogus, stop processing */
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cp += n;
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if (cp + QFIXEDSZ > eom)
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return (1);
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GETSHORT(type, cp);
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GETSHORT(class, cp);
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cp += INT32SZ;
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GETSHORT(dlen, cp);
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if (dlen > eom - cp)
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return (1); /* bogus, stop processing */
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switch (type) {
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case T_A:
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switch (class) {
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case C_IN:
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case C_HS:
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bcopy(cp, (char *)&inaddr, INADDRSZ);
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if (rr1 == NULL)
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rr1 = cp;
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if ((ntp->mask & inaddr.s_addr) == ntp->addr) {
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dprintf(2, (ddt,"net [%s] best choice\n",
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inet_ntoa(inaddr)));
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if (rr1 != cp) {
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bcopy(rr1, cp, INADDRSZ);
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bcopy((char *)&inaddr, rr1, INADDRSZ);
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}
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return (1);
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}
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break;
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}
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break;
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}
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cp += dlen;
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}
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return (0);
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}
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