271 lines
6.4 KiB
C
271 lines
6.4 KiB
C
#if !defined(lint) && !defined(SABER)
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static const char rcsid[] = "$Id: ns_ncache.c,v 8.29 2001/06/18 14:43:16 marka Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 1996-2000 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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#include "port_before.h"
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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/file.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <isc/eventlib.h>
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#include <isc/logging.h>
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#include "port_after.h"
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#include "named.h"
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#define BOUNDS_CHECK(ptr, count) \
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do { \
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if ((ptr) + (count) > eom) { \
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return; \
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} \
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} while (0)
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void
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cache_n_resp(u_char *msg, int msglen, struct sockaddr_in from,
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const char *qname, int qclass, int qtype)
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{
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struct databuf *dp;
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HEADER *hp;
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u_char *cp, *eom, *rdatap;
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char dname[MAXDNAME];
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int n, type, class, flags;
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u_int ancount, nscount, dlen;
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#ifdef RETURNSOA
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u_int32_t ttl;
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u_int16_t atype;
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u_char *sp, *cp1;
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u_char data[MAXDATA];
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size_t len = sizeof data;
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#endif
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nameserIncr(from.sin_addr, nssRcvdNXD);
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hp = (HEADER *)msg;
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cp = msg + HFIXEDSZ;
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eom = msg + msglen;
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switch (ntohs(hp->qdcount)) {
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case 0:
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dname[sizeof dname - 1] = '\0';
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strncpy(dname, qname, sizeof dname);
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if (dname[sizeof dname - 1] != '\0') {
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ns_debug(ns_log_ncache, 1,
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"qp->qname too long (%d)", strlen(qname));
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hp->rcode = FORMERR;
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return;
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}
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class = qclass;
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type = qtype;
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break;
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case 1:
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n = dn_expand(msg, eom, cp, dname, sizeof dname);
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if (n < 0) {
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ns_debug(ns_log_ncache, 1,
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"Query expand name failed: cache_n_resp");
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hp->rcode = FORMERR;
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return;
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}
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cp += n;
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BOUNDS_CHECK(cp, 2 * INT16SZ);
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GETSHORT(type, cp);
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GETSHORT(class, cp);
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if (class > CLASS_MAX) {
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ns_debug(ns_log_ncache, 1,
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"bad class in cache_n_resp");
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hp->rcode = FORMERR;
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return;
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}
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break;
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default:
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ns_debug(ns_log_ncache, 1,
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"QDCOUNT>1 (%d) in cache_n_resp", ntohs(hp->qdcount));
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hp->rcode = FORMERR;
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return;
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}
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ns_debug(ns_log_ncache, 1, "ncache: dname %s, type %d, class %d",
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dname, type, class);
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ancount = ntohs(hp->ancount);
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nscount = ntohs(hp->nscount);
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while (ancount--) {
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u_int32_t ttl;
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int atype, aclass;
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n = dn_skipname(cp, eom);
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if (n < 0) {
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ns_debug(ns_log_ncache, 3, "ncache: form error");
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return;
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}
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cp += n;
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BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
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GETSHORT(atype, cp);
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GETSHORT(aclass, cp);
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if (atype != T_CNAME || aclass != class) {
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ns_debug(ns_log_ncache, 3,
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"ncache: not CNAME (%s) or wrong class (%s)",
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p_type(atype), p_class(aclass));
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return;
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}
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GETLONG(ttl, cp);
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GETSHORT(dlen, cp);
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BOUNDS_CHECK(cp, dlen);
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rdatap = cp;
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n = dn_expand(msg, msg + msglen, cp, dname, sizeof dname);
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if (n < 0) {
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ns_debug(ns_log_ncache, 3, "ncache: bad cname target");
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return;
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}
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cp += n;
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if (cp != rdatap + dlen) {
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ns_debug(ns_log_ncache, 3, "ncache: bad cname rdata");
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return;
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}
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}
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dp = NULL;
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#ifdef RETURNSOA
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while (nscount--) {
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sp = cp;
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/* we store NXDOMAIN as T_SOA regardless of the query type */
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if (hp->rcode == NXDOMAIN)
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type = T_SOA;
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/* store ther SOA record */
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n = dn_skipname(cp, msg + msglen);
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if (n < 0) {
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ns_debug(ns_log_ncache, 3, "ncache: form error");
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return;
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}
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cp += n;
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BOUNDS_CHECK(cp, 3 * INT16SZ + INT32SZ);
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GETSHORT(atype, cp); /* type */
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cp += INT16SZ; /* class */
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GETLONG(ttl, cp); /* ttl */
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GETSHORT(dlen, cp); /* dlen */
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BOUNDS_CHECK(cp, dlen);
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if (atype != T_SOA) {
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ns_debug(ns_log_ncache, 3,
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"ncache: type (%d) != T_SOA", atype);
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cp += dlen;
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continue;
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}
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rdatap = cp;
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/* origin */
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n = dn_expand(msg, msg + msglen, cp, (char*)data, len);
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if (n < 0) {
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ns_debug(ns_log_ncache, 3,
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"ncache: origin form error");
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return;
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}
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cp += n;
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n = strlen((char*)data) + 1;
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cp1 = data + n;
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len -= n;
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/* mail */
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n = dn_expand(msg, msg + msglen, cp, (char*)cp1, len);
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if (n < 0) {
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ns_debug(ns_log_ncache, 3, "ncache: mail form error");
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return;
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}
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cp += n;
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n = strlen((char*)cp1) + 1;
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cp1 += n;
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len -= n;
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n = 5 * INT32SZ;
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BOUNDS_CHECK(cp, n);
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memcpy(cp1, cp, n);
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/* serial, refresh, retry, expire, min */
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cp1 += n;
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len -= n;
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cp += n;
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if (cp != rdatap + dlen) {
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ns_debug(ns_log_ncache, 3, "ncache: form error");
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return;
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}
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/* store the zone of the soa record */
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n = dn_expand(msg, msg + msglen, sp, (char*)cp1, len);
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if (n < 0) {
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ns_debug(ns_log_ncache, 3, "ncache: form error 2");
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return;
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}
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n = strlen((char*)cp1) + 1;
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cp1 += n;
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/*
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* we only want to store these long enough so that
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* ns_resp can find it.
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*/
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if (qtype == T_SOA && hp->rcode == NXDOMAIN)
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ttl = 0;
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dp = savedata(class, type,
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MIN(ttl, server_options->max_ncache_ttl) +
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tt.tv_sec, data,
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cp1 - data);
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break;
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}
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#endif
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if (dp == NULL)
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#ifdef STRICT_RFC2308
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dp = savedata(class, type, tt.tv_sec, NULL, 0);
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#else
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dp = savedata(class, type, NTTL + tt.tv_sec, NULL, 0);
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#endif
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dp->d_zone = DB_Z_CACHE;
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dp->d_cred = hp->aa ? DB_C_AUTH : DB_C_ANSWER;
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dp->d_secure = DB_S_INSECURE; /* BEW - should be UNCHECKED */
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dp->d_clev = 0;
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if(hp->rcode == NXDOMAIN) {
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dp->d_rcode = NXDOMAIN;
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flags = DB_NODATA|DB_NOTAUTH|DB_NOHINTS;
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} else {
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dp->d_rcode = NOERROR_NODATA;
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flags = DB_NOTAUTH|DB_NOHINTS;
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}
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n = db_update(dname, dp, dp, NULL, flags, hashtab, from);
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if (n != OK)
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ns_debug(ns_log_ncache, 1,
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"db_update failed (%d), cache_n_resp()", n);
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else
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ns_debug(ns_log_ncache, 4,
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"ncache succeeded: [%s %s %s] rcode:%d ttl:%ld",
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dname, p_type(type), p_class(class),
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dp->d_rcode, (long)(dp->d_ttl - tt.tv_sec));
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db_detach(&dp);
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}
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