File arpwatch-2.1a11-hname-overflow.dif of Package arpwatch.18199

--- arpwatch-2.1a11/db.c
+++ arpwatch-2.1a11/db.c
@@ -62,7 +62,11 @@
 /* Ethernet info */
 struct einfo {
 	u_char e[6];		/* ether address */
-	char h[34];		/* simple hostname */
+	/* DNS name components can be up to 63 octets, and 
+	 * that's not counting non-alphanumerics that may
+	 * get expanded to \nnn. --okir
+	 */
+	char h[64];		/* simple hostname */
 	time_t t;		/* timestamp */
 };
 
@@ -283,8 +287,10 @@
 	BCOPY(e, ep->e, 6);
 	if (h == NULL && !initializing)
 		h = getsname(a);
-	if (h != NULL && !isdigit((int)*h))
-		strcpy(ep->h, h);
+	if (h != NULL && !isdigit((int)*h)) {
+		memset(ep->h, 0, sizeof(ep->h));
+		strncpy(ep->h, h, sizeof(ep->h)-1);
+	}
 	ep->t = t;
 	return (ep);
 }
@@ -304,7 +310,8 @@
 	if (!isdigit((int)*h) && strcmp(h, ep->h) != 0) {
 		syslog(LOG_INFO, "hostname changed %s %s %s -> %s",
 		    intoa(ap->a), e2str(ep->e), ep->h, h);
-		strcpy(ep->h, h);
+		memset(ep->h, 0, sizeof(ep->h));
+		strncpy(ep->h, h, sizeof(ep->h)-1);
 	}
 }