NetBSD/dist/bind/bin/named/ns_ncache.c

273 lines
6.5 KiB
C

/* $NetBSD: ns_ncache.c,v 1.2 2001/01/27 07:21:59 itojun Exp $ */
#if !defined(lint) && !defined(SABER)
static const char rcsid[] = "Id: ns_ncache.c,v 8.27 2000/04/21 06:54:09 vixie Exp";
#endif /* not lint */
/*
* Copyright (c) 1996-2000 by Internet Software Consortium.
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
#include "port_before.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <isc/eventlib.h>
#include <isc/logging.h>
#include "port_after.h"
#include "named.h"
#define BOUNDS_CHECK(ptr, count) \
do { \
if ((ptr) + (count) > eom) { \
return; \
} \
} while (0)
void
cache_n_resp(u_char *msg, int msglen, struct sockaddr_in from,
const char *qname, int qclass, int qtype)
{
struct databuf *dp;
HEADER *hp;
u_char *cp, *eom, *rdatap;
char dname[MAXDNAME];
int n, type, class, flags;
u_int ancount, nscount, dlen;
#ifdef RETURNSOA
u_int32_t ttl;
u_int16_t atype;
u_char *sp, *cp1;
u_char data[MAXDATA];
size_t len = sizeof data;
#endif
nameserIncr(from.sin_addr, nssRcvdNXD);
hp = (HEADER *)msg;
cp = msg + HFIXEDSZ;
eom = msg + msglen;
switch (ntohs(hp->qdcount)) {
case 0:
dname[sizeof dname - 1] = '\0';
strncpy(dname, qname, sizeof dname);
if (dname[sizeof dname - 1] != '\0') {
ns_debug(ns_log_ncache, 1,
"qp->qname too long (%d)", strlen(qname));
hp->rcode = FORMERR;
return;
}
class = qclass;
type = qtype;
break;
case 1:
n = dn_expand(msg, eom, cp, dname, sizeof dname);
if (n < 0) {
ns_debug(ns_log_ncache, 1,
"Query expand name failed: cache_n_resp");
hp->rcode = FORMERR;
return;
}
cp += n;
BOUNDS_CHECK(cp, 2 * INT16SZ);
GETSHORT(type, cp);
GETSHORT(class, cp);
if (class > CLASS_MAX) {
ns_debug(ns_log_ncache, 1,
"bad class in cache_n_resp");
hp->rcode = FORMERR;
return;
}
break;
default:
ns_debug(ns_log_ncache, 1,
"QDCOUNT>1 (%d) in cache_n_resp", ntohs(hp->qdcount));
hp->rcode = FORMERR;
return;
}
ns_debug(ns_log_ncache, 1, "ncache: dname %s, type %d, class %d",
dname, type, class);
ancount = ntohs(hp->ancount);
nscount = ntohs(hp->nscount);
while (ancount--) {
u_int32_t ttl;
u_int atype, aclass;
n = dn_skipname(cp, eom);
if (n < 0) {
ns_debug(ns_log_ncache, 3, "ncache: form error");
return;
}
cp += n;
BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
GETSHORT(atype, cp);
GETSHORT(aclass, cp);
if (atype != T_CNAME || aclass != class) {
ns_debug(ns_log_ncache, 3,
"ncache: not CNAME (%s) or wrong class (%s)",
p_type(atype), p_class(aclass));
return;
}
GETLONG(ttl, cp);
GETSHORT(dlen, cp);
BOUNDS_CHECK(cp, dlen);
rdatap = cp;
n = dn_expand(msg, msg + msglen, cp, dname, sizeof dname);
if (n < 0) {
ns_debug(ns_log_ncache, 3, "ncache: bad cname target");
return;
}
cp += n;
if (cp != rdatap + dlen) {
ns_debug(ns_log_ncache, 3, "ncache: bad cname rdata");
return;
}
}
dp = NULL;
#ifdef RETURNSOA
while (nscount--) {
sp = cp;
/* we store NXDOMAIN as T_SOA regardless of the query type */
if (hp->rcode == NXDOMAIN)
type = T_SOA;
/* store ther SOA record */
n = dn_skipname(cp, msg + msglen);
if (n < 0) {
ns_debug(ns_log_ncache, 3, "ncache: form error");
return;
}
cp += n;
BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
GETSHORT(atype, cp); /* type */
cp += INT16SZ; /* class */
GETLONG(ttl, cp); /* ttl */
GETSHORT(dlen, cp); /* dlen */
BOUNDS_CHECK(cp, dlen);
if (atype != T_SOA) {
ns_debug(ns_log_ncache, 3,
"ncache: type (%d) != T_SOA", atype);
cp += dlen;
continue;
}
rdatap = cp;
/* origin */
n = dn_expand(msg, msg + msglen, cp, (char*)data, len);
if (n < 0) {
ns_debug(ns_log_ncache, 3,
"ncache: origin form error");
return;
}
cp += n;
n = strlen((char*)data) + 1;
cp1 = data + n;
len -= n;
/* mail */
n = dn_expand(msg, msg + msglen, cp, (char*)cp1, len);
if (n < 0) {
ns_debug(ns_log_ncache, 3, "ncache: mail form error");
return;
}
cp += n;
n = strlen((char*)cp1) + 1;
cp1 += n;
len -= n;
n = 5 * INT32SZ;
BOUNDS_CHECK(cp, n);
memcpy(cp1, cp, n);
/* serial, refresh, retry, expire, min */
cp1 += n;
len -= n;
cp += n;
if (cp != rdatap + dlen) {
ns_debug(ns_log_ncache, 3, "ncache: form error");
return;
}
/* store the zone of the soa record */
n = dn_expand(msg, msg + msglen, sp, (char*)cp1, len);
if (n < 0) {
ns_debug(ns_log_ncache, 3, "ncache: form error 2");
return;
}
n = strlen((char*)cp1) + 1;
cp1 += n;
/*
* we only want to store these long enough so that
* ns_resp can find it.
*/
if (qtype == T_SOA && hp->rcode == NXDOMAIN)
ttl = 0;
dp = savedata(class, type,
MIN(ttl, server_options->max_ncache_ttl) +
tt.tv_sec, data,
cp1 - data);
break;
}
#endif
if (dp == NULL)
#ifdef STRICT_RFC2308
dp = savedata(class, type, tt.tv_sec, NULL, 0);
#else
dp = savedata(class, type, NTTL + tt.tv_sec, NULL, 0);
#endif
dp->d_zone = DB_Z_CACHE;
dp->d_cred = hp->aa ? DB_C_AUTH : DB_C_ANSWER;
dp->d_secure = DB_S_INSECURE; /* BEW - should be UNCHECKED */
dp->d_clev = 0;
if(hp->rcode == NXDOMAIN) {
dp->d_rcode = NXDOMAIN;
flags = DB_NODATA|DB_NOTAUTH|DB_NOHINTS;
} else {
dp->d_rcode = NOERROR_NODATA;
flags = DB_NOTAUTH|DB_NOHINTS;
}
if ((n = db_update(dname, dp, dp, NULL, flags, hashtab, from)) != OK) {
ns_debug(ns_log_ncache, 1,
"db_update failed (%d), cache_n_resp()", n);
db_freedata(dp);
return;
}
ns_debug(ns_log_ncache, 4,
"ncache succeeded: [%s %s %s] rcode:%d ttl:%ld",
dname, p_type(type), p_class(class),
dp->d_rcode, (long)(dp->d_ttl - tt.tv_sec));
}