Import (trimmed) ISC bind-8.1.2-t3b. This will be updated to 8.1.2 on

final release.

Obtained from:  ftp.isc.org

1 files changed, 226 insertions, 0 deletions

diff --git a/contrib/bind/bin/named/ns_ncache.c b/contrib/bind/bin/named/ns_ncache.c
new file mode 100644
index 0000000..413ccc6
--- /dev/null
+++ b/contrib/bind/bin/named/ns_ncache.c
@@ -0,0 +1,226 @@
+#if !defined(lint) && !defined(SABER)
+static char rcsid[] = "$Id: ns_ncache.c,v 8.17 1998/03/20 01:12:01 halley Exp $";
+#endif /* not lint */
+
+/*
+ * Copyright (c) 1996, 1997 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 <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) {
+	struct databuf *dp;
+	HEADER *hp;
+	u_char *cp, *eom, *rdatap;
+	char dname[MAXDNAME];
+	int n;
+	int type, class;
+	int Vcode;
+	int flags;
+	u_int16_t ancount;
+	u_int dlen;
+
+	nameserIncr(from.sin_addr, nssRcvdNXD);
+
+	hp = (HEADER *)msg;
+	cp = msg+HFIXEDSZ;
+	eom = msg + msglen;
+  
+	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);
+	ns_debug(ns_log_ncache, 1, "ncache: dname %s, type %d, class %d",
+		 dname, type, class);
+
+	ancount = ntohs(hp->ancount);
+
+	while (ancount--) {
+		u_int32_t ttl;
+		u_int16_t atype;
+		u_int16_t 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: form error");
+			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: form error");
+			return;
+		}
+		cp += n;
+		if (cp != rdatap + dlen) {
+			ns_debug(ns_log_ncache, 3, "ncache: form error");
+			return;
+		}
+	}
+
+#ifdef RETURNSOA
+	if (hp->nscount) {
+		u_int32_t ttl;
+		u_int16_t atype;
+		u_char *tp = cp;
+		u_char *cp1;
+		u_char data[MAXDATA];
+		size_t len = sizeof data;
+
+		/* 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(tp, msg + msglen);
+		if (n < 0) {
+			ns_debug(ns_log_ncache, 3, "ncache: form error");
+			return;
+		}
+		tp += n;
+		
+		BOUNDS_CHECK(tp, 3 * INT16SZ + INT32SZ);
+		GETSHORT(atype, tp);		/* type */
+		if (atype != T_SOA) {
+			ns_debug(ns_log_ncache, 3,
+				 "ncache: type (%d) != T_SOA", atype);
+			goto no_soa;
+		}
+		tp += INT16SZ;			/* class */
+		GETLONG(ttl, tp);		/* ttl */
+		GETSHORT(dlen, tp);		/* dlen */
+		BOUNDS_CHECK(tp, dlen);
+		rdatap = tp;
+
+		/* origin */
+		n = dn_expand(msg, msg + msglen, tp, (char*)data, len);
+		if (n < 0) {
+			ns_debug(ns_log_ncache, 3,
+				 "ncache: origin form error");
+			return;
+		}
+		tp += n;
+		n = strlen((char*)data) + 1;
+		cp1 = data + n;
+		len -= n;
+		/* mail */
+		n = dn_expand(msg, msg + msglen, tp, (char*)cp1, len);
+		if (n < 0) {
+			ns_debug(ns_log_ncache, 3, "ncache: mail form error");
+			return;
+		}
+		tp += n;
+		n = strlen((char*)cp1) + 1;
+		cp1 += n;
+		len -= n;
+		n = 5 * INT32SZ;
+		BOUNDS_CHECK(tp, n);
+		memcpy(cp1, tp, n);
+		/* serial, refresh, retry, expire, min */
+		cp1 += n;
+		len -= n;
+		tp += n;
+		if (tp != 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, cp, (char*)cp1, len);
+		if (n < 0) {
+			ns_debug(ns_log_ncache, 3, "ncache: form error 2");
+			return;
+		}
+		n = strlen((char*)cp1) + 1;
+		cp1 += n;
+
+		dp = savedata(class, type, MIN(ttl, NTTL) + tt.tv_sec, data,
+			      cp1 - data);
+	} else {
+ no_soa:
+#endif
+        dp = savedata(class, type, NTTL + tt.tv_sec, NULL, 0);
+#ifdef RETURNSOA
+	}
+#endif
+	dp->d_zone = DB_Z_CACHE;
+	dp->d_cred = hp->aa ? DB_C_AUTH : DB_C_ANSWER;
+	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));
+}