From 58ca52f41726d17758909ddafba7b6b6766c789c Mon Sep 17 00:00:00 2001
From: peter <peter@FreeBSD.org>
Date: Sat, 2 May 1998 11:04:44 +0000
Subject: Import ISC bind v4.9.7-T1B as a reference.  We may need this if we
 update -stable to 4.9.7 instead of 8.1.2 for whatever reason.

---
 contrib/bind/named/ns_req.c | 56 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 47 insertions(+), 9 deletions(-)

(limited to 'contrib/bind/named/ns_req.c')

diff --git a/contrib/bind/named/ns_req.c b/contrib/bind/named/ns_req.c
index 0ed1296..bd59bab 100644
--- a/contrib/bind/named/ns_req.c
+++ b/contrib/bind/named/ns_req.c
@@ -1,6 +1,6 @@
 #if !defined(lint) && !defined(SABER)
 static char sccsid[] = "@(#)ns_req.c	4.47 (Berkeley) 7/1/91";
-static char rcsid[] = "$Id: ns_req.c,v 8.28 1997/06/01 20:34:34 vixie Exp $";
+static char rcsid[] = "$Id: ns_req.c,v 8.29 1998/04/07 04:59:45 vixie Exp $";
 #endif /* not lint */
 
 /*
@@ -328,6 +328,11 @@ req_notify(hp, cpp, eom, msg, from)
 		hp->rcode = FORMERR;
 		return (Finish);
 	}
+	if (*cpp + 2 * INT16SZ > eom) {
+		dprintf(1, (ddt, "FORMERR notify too short"));
+		hp->rcode = FORMERR;
+		return (Finish);
+	}
 	*cpp += n;
 	GETSHORT(type, *cpp);
 	GETSHORT(class, *cpp);
@@ -461,13 +466,13 @@ req_query(hp, cpp, eom, qsp, buflenp, msglenp, msg, dfd, from)
 		return (Finish);
 	}
 	*cpp += n;
-	GETSHORT(type, *cpp);
-	GETSHORT(class, *cpp);
-	if (*cpp > eom) {
+	if (*cpp + 2 * INT16SZ > eom) {
 		dprintf(1, (ddt, "FORMERR Query message length short\n"));
 		hp->rcode = FORMERR;
 		return (Finish);
 	}
+	GETSHORT(type, *cpp);
+	GETSHORT(class, *cpp);
 	if (*cpp < eom) {
 		dprintf(6, (ddt,"message length > received message\n"));
 		*msglenp = *cpp - msg;
@@ -990,6 +995,11 @@ req_iquery(hp, cpp, eom, buflenp, msg, from)
 		return (Finish);
 	}
 	*cpp += n;
+	if (*cpp + 3 * INT16SZ + INT32SZ > eom) {
+		dprintf(1, (ddt, "FORMERR IQuery message too short"));
+		hp->rcode = FORMERR;
+		return (Finish);
+	}
 	GETSHORT(type, *cpp);
 	GETSHORT(class, *cpp);
 	*cpp += INT32SZ;	/* ttl */
@@ -1007,7 +1017,7 @@ req_iquery(hp, cpp, eom, buflenp, msg, from)
 	switch (type) {
 	case T_A:
 #ifndef INVQ
-		if (!fake_iquery)
+		if (!fake_iquery || dlen != INT32SZ)
 			return (Refuse);
 #endif
 #ifdef INVQ
@@ -1021,7 +1031,10 @@ req_iquery(hp, cpp, eom, buflenp, msg, from)
 	dprintf(1, (ddt, "req: IQuery class %d type %d\n", class, type));
 
 	fname = (char *)msg + HFIXEDSZ;
-	bcopy(fname, anbuf, alen = (char *)*cpp - fname);
+	alen = (char *)*cpp - fname;
+	if ((size_t)alen > sizeof anbuf)
+		return (Refuse);
+	bcopy(fname, anbuf, alen);
 	data = anbuf + alen - dlen;
 	*cpp = (u_char *)fname;
 	*buflenp -= HFIXEDSZ;
@@ -1068,6 +1081,10 @@ req_iquery(hp, cpp, eom, buflenp, msg, from)
 					return (Finish);
 				}
 				*cpp += n;
+				if (*cpp + 2 * INT16SZ > dnbuf + *buflenp) {
+					hp->tc = 1;
+					return (Finish);
+				}
 				PUTSHORT((u_int16_t)dp->d_type, *cpp);
 				PUTSHORT((u_int16_t)dp->d_class, *cpp);
 				*buflenp -= n;
@@ -1256,6 +1273,8 @@ make_rr(name, dp, buf, buflen, doadd)
 	}
 
 	buflen -= RRFIXEDSZ;
+	if (buflen < 0)
+		return (-1);
 #if defined(RETURNSOA) && defined(NCACHE)
 	if (dp->d_rcode) {
 		name = (char *)dp->d_data;
@@ -1269,6 +1288,8 @@ make_rr(name, dp, buf, buflen, doadd)
 		return (-1);
 	cp = buf + n;
 	buflen -= n;
+	if (buflen < 0)
+		return (-1);
 	PUTSHORT((u_int16_t)type, cp);
 	PUTSHORT((u_int16_t)dp->d_class, cp);
 	PUTLONG(ttl, cp);
@@ -1308,6 +1329,8 @@ make_rr(name, dp, buf, buflen, doadd)
 			return (-1);
 		cp += n;
 		buflen -= type == T_SOA ? n + 5 * INT32SZ : n;
+		if (buflen < 0)
+			return (-1);
 		cp1 += strlen((char *)cp1) + 1;
 		n = dn_comp((char *)cp1, cp, buflen, dnptrs, edp);
 		if (n < 0)
@@ -1326,10 +1349,10 @@ make_rr(name, dp, buf, buflen, doadd)
 		/* cp1 == our data/ cp == data of RR */
 		cp1 = dp->d_data;
 
- 		if ((buflen -= INT16SZ) < 0)
-			return (-1);
-
  		/* copy order */
+		buflen -= INT16SZ;
+		if (buflen < 0)
+			return (-1);
  		bcopy(cp1, cp, INT16SZ);
  		cp += INT16SZ;
  		cp1 += INT16SZ;
@@ -1337,6 +1360,9 @@ make_rr(name, dp, buf, buflen, doadd)
 		dprintf(1, (ddt, "current size n = %u\n", n));
 
 		/* copy preference */
+		buflen -= INT16SZ;
+		if (buflen < 0)
+			return (-1);
 		bcopy(cp1, cp, INT16SZ);
 		cp += INT16SZ;
 		cp1 += INT16SZ;
@@ -1345,6 +1371,9 @@ make_rr(name, dp, buf, buflen, doadd)
 
 		/* Flags */
 		n = *cp1++;
+		buflen -= n + 1;
+		if (buflen < 0)
+			return (-1);
 		dprintf(1, (ddt, "size of n at flags = %d\n", n));
 		*cp++ = n;
 		bcopy(cp1,cp,n);
@@ -1355,6 +1384,9 @@ make_rr(name, dp, buf, buflen, doadd)
 		
 		/* Service */
 		n = *cp1++;
+		buflen -= n + 1;
+		if (buflen < 0)
+			return (-1);
 		*cp++ = n;
 		bcopy(cp1,cp,n);
 		cp += n;
@@ -1364,6 +1396,9 @@ make_rr(name, dp, buf, buflen, doadd)
 
 		/* Regexp */
 		n = *cp1++;
+		buflen -= n + 1;
+		if (buflen < 0)
+			return (-1);
 		*cp++ = n;
 		bcopy(cp1,cp,n);
 		cp += n;
@@ -1402,6 +1437,9 @@ make_rr(name, dp, buf, buflen, doadd)
  		cp1 += INT16SZ;
 
 		if (type == T_SRV) {
+			buflen -= INT16SZ*2;
+			if (buflen < 0)
+				return (-1);
 			bcopy(cp1, cp, INT16SZ*2);
 			cp += INT16SZ*2;
 			cp1 += INT16SZ*2;
-- 
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