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diff --git a/external/unbound/daemon/acl_list.h b/external/unbound/daemon/acl_list.h
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+++ b/external/unbound/daemon/acl_list.h
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+/*
+ * daemon/acl_list.h - client access control storage for the server.
+ *
+ * Copyright (c) 2007, NLnet Labs. All rights reserved.
+ *
+ * This software is open source.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 
+ * Neither the name of the NLNET LABS nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * \file
+ *
+ * This file keeps track of the list of clients that are allowed to 
+ * access the server.
+ */
+
+#ifndef DAEMON_ACL_LIST_H
+#define DAEMON_ACL_LIST_H
+#include "util/storage/dnstree.h"
+struct config_file;
+struct regional;
+
+/**
+ * Enumeration of access control options for an address range.
+ * Allow or deny access.
+ */
+enum acl_access {
+	/** disallow any access whatsoever, drop it */
+	acl_deny = 0,
+	/** disallow access, send a polite 'REFUSED' reply */
+	acl_refuse,
+	/** disallow any access to zones that aren't local, drop it */
+	acl_deny_non_local,
+	/** disallow access to zones that aren't local, 'REFUSED' reply */
+	acl_refuse_non_local,
+	/** allow full access for recursion (+RD) queries */
+	acl_allow,
+	/** allow full access for all queries, recursion and cache snooping */
+	acl_allow_snoop
+};
+
+/**
+ * Access control storage structure
+ */
+struct acl_list {
+	/** regional for allocation */
+	struct regional* region;
+	/** 
+	 * Tree of the addresses that are allowed/blocked.
+	 * contents of type acl_addr.
+	 */
+	rbtree_t tree;
+};
+
+/**
+ *
+ * An address span with access control information
+ */
+struct acl_addr {
+	/** node in address tree */
+	struct addr_tree_node node;
+	/** access control on this netblock */
+	enum acl_access control;
+};
+
+/**
+ * Create acl structure 
+ * @return new structure or NULL on error.
+ */
+struct acl_list* acl_list_create(void);
+
+/**
+ * Delete acl structure.
+ * @param acl: to delete.
+ */
+void acl_list_delete(struct acl_list* acl);
+
+/**
+ * Process access control config.
+ * @param acl: where to store.
+ * @param cfg: config options.
+ * @return 0 on error.
+ */
+int acl_list_apply_cfg(struct acl_list* acl, struct config_file* cfg);
+
+/**
+ * Lookup address to see its access control status.
+ * @param acl: structure for address storage.
+ * @param addr: address to check
+ * @param addrlen: length of addr.
+ * @return: what to do with message from this address.
+ */
+enum acl_access acl_list_lookup(struct acl_list* acl, 
+	struct sockaddr_storage* addr, socklen_t addrlen);
+
+/**
+ * Get memory used by acl structure.
+ * @param acl: structure for address storage.
+ * @return bytes in use.
+ */
+size_t acl_list_get_mem(struct acl_list* acl);
+
+#endif /* DAEMON_ACL_LIST_H */