From: Ted Lemon <source@isc.org>
Date: Fri, 2 Jul 1999 17:10:51 +0000 (+0000)
Subject: Support one-lease-per-client.
X-Git-Tag: V3-BETA-1-PATCH-0~25
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e8e6a30f538c3aceb82d463bc6f2cc35f98ab2b7;p=thirdparty%2Fdhcp.git

Support one-lease-per-client.
---

diff --git a/server/dhcp.c b/server/dhcp.c
index ac12cd99a..97207cc36 100644
--- a/server/dhcp.c
+++ b/server/dhcp.c
@@ -22,7 +22,7 @@
 
 #ifndef lint
 static char copyright[] =
-"$Id: dhcp.c,v 1.95 1999/07/01 20:02:57 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.  All rights reserved.\n";
+"$Id: dhcp.c,v 1.96 1999/07/02 17:10:51 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.  All rights reserved.\n";
 #endif /* not lint */
 
 #include "dhcpd.h"
@@ -876,6 +876,45 @@ void ack_lease (packet, lease, offer, when, msg)
 					      ? lease -> pool -> group
 					      : lease -> subnet -> group));
 
+	/* See if the client is only supposed to have one lease at a time,
+	   and if so, find its other leases and release them.    We can only
+	   do this on DHCPREQUEST.    It's a little weird to do this before
+	   looking at permissions, because the client might not actually
+	   _get_ a lease after we've done the permission check, but the
+	   assumption for this option is that the client has exactly one
+	   network interface, and will only ever remember one lease.   So
+	   if it sends a DHCPREQUEST, and doesn't get the lease, it's already
+	   forgotten about its old lease, so we can too. */
+	if (offer == DHCPREQUEST &&
+	    (oc = lookup_option (&server_universe, state -> options,
+				 SV_ONE_LEASE_PER_CLIENT)) &&
+	    evaluate_boolean_option_cache (packet, packet -> options, oc)) {
+		struct lease *seek;
+		if (lease -> uid_len) {
+			do {
+				seek = find_lease_by_uid (lease -> uid,
+							  lease -> uid_len);
+				if (seek == lease)
+					seek = lease -> n_uid;
+				if (seek) {
+					release_lease (seek);
+				}
+			} while (seek);
+		} else {
+			do {
+				seek = (find_lease_by_hw_addr
+					(lease -> hardware_addr.haddr,
+					 lease -> hardware_addr.hlen));
+				if (seek == lease)
+					seek = lease -> n_hw;
+				if (seek) {
+					release_lease (seek);
+				}
+			} while (seek);
+		}
+	}
+	
+
 	/* Make sure this packet satisfies the configured minimum
 	   number of seconds. */
 	if (offer == DHCPOFFER &&