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If a client REQUESTs an abandoned lease, reclaim it.

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This commit is contained in:
Ted Lemon
1998-06-25 21:24:23 +00:00
parent aaf053e333
commit c54885bd2d
1 changed files with 17 additions and 4 deletions
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21
server/dhcp.c
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@@ -42,7 +42,7 @@
#ifndef lint
static char copyright[] =
"$Id: dhcp.c,v 1.64 1998/06/25 03:56:24 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium. All rights reserved.\n";
"$Id: dhcp.c,v 1.65 1998/06/25 21:24:23 mellon Exp $ Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
@@ -1309,9 +1309,13 @@ struct lease *find_lease (packet, share, ours)
*ours = 1;
/* If the requested IP address isn't on the network the packet
came from, or if it's been abandoned, don't use it. */
if (ip_lease && (ip_lease -> shared_network != share ||
(ip_lease -> flags & ABANDONED_LEASE)))
came from, don't use it. Allow abandoned leases to be matched
here - if the client is requesting it, there's a decent chance
that it's because the lease database got trashed and a client
that thought it had this lease answered an ARP or PING, causing the
lease to be abandoned. If so, this request probably came from
that client. */
if (ip_lease && (ip_lease -> shared_network != share))
ip_lease = (struct lease *)0;
/* Toss ip_lease if it hasn't yet expired and the uid doesn't
@@ -1457,6 +1461,15 @@ struct lease *find_lease (packet, share, ours)
}
}
/* If we find an abandoned lease, take it, but print a
warning message, so that if it continues to lose,
the administrator will eventually investigate. */
if (lease -> flags & ABANDONED_LEASE) {
warn ("Reclaiming REQUESTed abandoned IP address %s.\n",
piaddr (lease -> ip_addr));
lease -> flags &= ~ABANDONED_LEASE;
}
return lease;
}