Index: bootp.c
===================================================================
RCS file: /home/ncvs/src/lib/libstand/bootp.c,v
retrieving revision 1.6
diff -u -r1.6 bootp.c
--- bootp.c	9 Jan 2007 01:02:03 -0000	1.6
+++ bootp.c	2 May 2007 17:06:35 -0000
@@ -319,6 +319,12 @@
 	if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
 		if(vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0)
 		    goto bad;
+		/* XXX DECRU Filter DHCP responses from MSFT hosts. */
+		printf("bootprecv: XXX DECRU: Vendor class ID %s\n", vendclassid);
+		if(bcmp(vendclassid, "MSFT", 4) == 0) {
+			printf("XXX DECRU: DHCP response from MSFT vendor, ignoring\n");
+			goto bad;
+		}
 	}
 #ifdef BOOTP_VEND_CMU
 	else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
@@ -385,6 +391,10 @@
 			bcopy(cp, &dhcp_serverip.s_addr,
 			      sizeof(dhcp_serverip.s_addr));
 		}
+		if (tag == TAG_CLASSID) {
+			strncpy(vendclassid, (char *)cp, sizeof(vendclassid));
+			vendclassid[size] = '\0';
+		}
 #endif
 		cp += size;
 	}
Index: globals.c
===================================================================
RCS file: /home/ncvs/src/lib/libstand/globals.c,v
retrieving revision 1.2
diff -u -r1.2 globals.c
--- globals.c	30 Sep 2001 22:28:01 -0000	1.2
+++ globals.c	2 May 2007 17:06:35 -0000
@@ -25,6 +25,8 @@
 int	hostnamelen;
 char	domainname[FNAME_SIZE];		/* our DNS domain */
 int	domainnamelen;
+char    vendclassid[FNAME_SIZE];	/* Vendor Class Identifier */
+int	vendclassidlen;
 char	ifname[IFNAME_SIZE];		/* name of interface (e.g. "le0") */
 struct	in_addr myip;			/* my ip address */
 struct	in_addr nameip;			/* DNS server ip address */
Index: net.h
===================================================================
RCS file: /home/ncvs/src/lib/libstand/net.h,v
retrieving revision 1.5
diff -u -r1.5 net.h
--- net.h	9 Jan 2007 01:02:04 -0000	1.5
+++ net.h	2 May 2007 17:06:35 -0000
@@ -74,6 +74,8 @@
 extern	int hostnamelen;
 extern	char domainname[FNAME_SIZE];
 extern	int domainnamelen;
+extern	char vendclassid[FNAME_SIZE];
+extern	int vendclassidlen;
 extern	char ifname[IFNAME_SIZE];
 
 /* All of these are in network order. */