106 lines
3.5 KiB
C
106 lines
3.5 KiB
C
/*
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* services/outbound_list.h - keep list of outbound serviced queries.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to help a module keep track of the
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* queries it has outstanding to authoritative servers.
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*/
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#ifndef SERVICES_OUTBOUND_LIST_H
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#define SERVICES_OUTBOUND_LIST_H
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struct outbound_entry;
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struct serviced_query;
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struct module_qstate;
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/**
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* The outbound list. This structure is part of the module specific query
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* state.
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*/
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struct outbound_list {
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/** The linked list of outbound query entries. */
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struct outbound_entry* first;
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};
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/**
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* Outbound list entry. A serviced query sent by a module processing the
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* query from the qstate. Double linked list to aid removal.
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*/
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struct outbound_entry {
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/** next in list */
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struct outbound_entry* next;
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/** prev in list */
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struct outbound_entry* prev;
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/** The query that was sent out */
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struct serviced_query* qsent;
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/** the module query state that sent it */
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struct module_qstate* qstate;
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};
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/**
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* Init the user allocated outbound list structure
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* @param list: the list structure.
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*/
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void outbound_list_init(struct outbound_list* list);
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/**
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* Clear the user owner outbound list structure.
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* Deletes serviced queries.
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* @param list: the list structure. It is cleared, but the list struct itself
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* is callers responsibility to delete.
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*/
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void outbound_list_clear(struct outbound_list* list);
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/**
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* Insert new entry into the list. Caller must allocate the entry with malloc.
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* qstate and qsent are set by caller.
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* @param list: the list to add to.
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* @param e: entry to add, it is only half initialised at call start, fully
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* initialised at call end.
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*/
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void outbound_list_insert(struct outbound_list* list,
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struct outbound_entry* e);
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/**
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* Remove an entry from the list, and deletes it.
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* Deletes serviced query in the entry.
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* @param list: the list to remove from.
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* @param e: the entry to remove.
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*/
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void outbound_list_remove(struct outbound_list* list,
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struct outbound_entry* e);
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#endif /* SERVICES_OUTBOUND_LIST_H */
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