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/*
* services/outbound_list.h - keep list of outbound serviced queries.
*
* 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 REGENTS 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 contains functions to help a module keep track of the
* queries it has outstanding to authoritative servers.
*/
#ifndef SERVICES_OUTBOUND_LIST_H
#define SERVICES_OUTBOUND_LIST_H
struct outbound_entry;
struct serviced_query;
struct module_qstate;
/**
* The outbound list. This structure is part of the module specific query
* state.
*/
struct outbound_list {
/** The linked list of outbound query entries. */
struct outbound_entry* first;
};
/**
* Outbound list entry. A serviced query sent by a module processing the
* query from the qstate. Double linked list to aid removal.
*/
struct outbound_entry {
/** next in list */
struct outbound_entry* next;
/** prev in list */
struct outbound_entry* prev;
/** The query that was sent out */
struct serviced_query* qsent;
/** the module query state that sent it */
struct module_qstate* qstate;
};
/**
* Init the user allocated outbound list structure
* @param list: the list structure.
*/
void outbound_list_init(struct outbound_list* list);
/**
* Clear the user owner outbound list structure.
* Deletes serviced queries.
* @param list: the list structure. It is cleared, but the list struct itself
* is callers responsability to delete.
*/
void outbound_list_clear(struct outbound_list* list);
/**
* Insert new entry into the list. Caller must allocate the entry with malloc.
* qstate and qsent are set by caller.
* @param list: the list to add to.
* @param e: entry to add, it is only half initialised at call start, fully
* initialised at call end.
*/
void outbound_list_insert(struct outbound_list* list,
struct outbound_entry* e);
/**
* Remove an entry from the list, and deletes it.
* Deletes serviced query in the entry.
* @param list: the list to remove from.
* @param e: the entry to remove.
*/
void outbound_list_remove(struct outbound_list* list,
struct outbound_entry* e);
#endif /* SERVICES_OUTBOUND_LIST_H */
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