home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
rtsi.com
/
2014.01.www.rtsi.com.tar
/
www.rtsi.com
/
OS9
/
OSK
/
NETWORK
/
ISP
/
bind.4.8.3.lzh
/
BIND483
/
NAMED
/
ns_sort.c
< prev
next >
Wrap
Text File
|
1993-08-24
|
4KB
|
143 lines
/*
* Copyright (c) 1986, 1990 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)ns_sort.c 4.8 (Berkeley) 6/1/90";
#endif /* not lint */
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <netinet/in.h>
#include <syslog.h>
#include <arpa/nameser.h>
#include "ns.h"
#include "db.h"
extern char *p_type(), *p_class();
extern int debug;
extern FILE *ddt;
struct netinfo*
local(from)
struct sockaddr_in *from;
{
extern struct netinfo *nettab, netloop, **enettab;
struct netinfo *ntp;
if (from->sin_addr.s_addr == netloop.my_addr.s_addr)
return( &netloop);
for (ntp = nettab; ntp != *enettab; ntp = ntp->next) {
if (ntp->net == (from->sin_addr.s_addr & ntp->mask))
return(ntp);
}
return(NULL);
}
sort_response(cp, ancount, lp, eom)
register char *cp;
register int ancount;
struct netinfo *lp;
u_char *eom;
{
register struct netinfo *ntp;
extern struct netinfo *nettab;
#ifdef DEBUG
if (debug > 2)
fprintf(ddt,"sort_response(%d)\n", ancount);
#endif DEBUG
if (ancount > 1) {
if (sort_rr(cp, ancount, lp, eom))
return;
for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
if ((ntp->net == lp->net) && (ntp->mask == lp->mask))
continue;
if (sort_rr(cp, ancount, ntp, eom))
break;
}
}
}
int
sort_rr(cp, count, ntp, eom)
register u_char *cp;
int count;
register struct netinfo *ntp;
u_char *eom;
{
int type, class, dlen, n, c;
struct in_addr inaddr;
u_char *rr1;
#ifdef DEBUG
if (debug > 2) {
inaddr.s_addr = ntp->net;
fprintf(ddt,"sort_rr( x%x, %d, %s)\n",cp, count,
inet_ntoa(inaddr));
}
#endif DEBUG
rr1 = NULL;
for (c = count; c > 0; --c) {
n = dn_skipname(cp, eom);
if (n < 0)
return (1); /* bogus, stop processing */
cp += n;
if (cp + QFIXEDSZ > eom)
return (1);
GETSHORT(type, cp);
GETSHORT(class, cp);
cp += sizeof(u_long);
GETSHORT(dlen, cp);
if (dlen > eom - cp)
return (1); /* bogus, stop processing */
switch (type) {
case T_A:
switch (class) {
case C_IN:
case C_HS:
bcopy(cp, (char *)&inaddr, sizeof(inaddr));
if (rr1 == NULL)
rr1 = cp;
if ((ntp->mask & inaddr.s_addr) == ntp->net) {
#ifdef DEBUG
if (debug > 1) {
fprintf(ddt,"net %s best choice\n",
inet_ntoa(inaddr));
}
#endif DEBUG
if (rr1 != cp) {
bcopy(rr1, cp, sizeof(inaddr));
bcopy((char *)&inaddr, rr1, sizeof(inaddr));
}
return(1);
}
break;
}
break;
}
cp += dlen;
}
return(0);
}