71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*
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* Copyright (C) 2005-2007 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup receiver receiver
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* @{ @ingroup network
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*/
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#ifndef RECEIVER_H_
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#define RECEIVER_H_
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typedef struct receiver_t receiver_t;
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#include <library.h>
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#include <utils/host.h>
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/**
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* Receives packets from the socket and adds them to the job queue.
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*
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* The receiver starts a thread, which reads on the blocking socket. A received
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* packet is preparsed and a process_message_job is queued in the job queue.
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*
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* To endure DoS attacks, cookies are enabled when to many IKE_SAs are half
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* open. The calculation of cookies is slightly different from the proposed
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* method in RFC4306. We do not include a nonce, because we think the advantage
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* we gain does not justify the overhead to parse the whole message.
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* Instead of VersionIdOfSecret, we include a timestamp. This allows us to
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* find out which key was used for cookie creation. Further, we can set a
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* lifetime for the cookie, which allows us to reuse the secret for a longer
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* time.
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* COOKIE = time | sha1( IPi | SPIi | time | secret )
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*
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* The secret is changed after a certain amount of cookies sent. The old
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* secret is stored to allow a clean migration between secret changes.
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*
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* Further, the number of half-initiated IKE_SAs is limited per peer. This
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* mades it impossible for a peer to flood the server with its real IP address.
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*/
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struct receiver_t {
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/**
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* Destroys a receiver_t object.
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*/
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void (*destroy) (receiver_t *receiver);
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};
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/**
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* Create a receiver_t object.
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*
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* The receiver thread will start working, get data
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* from the socket and add those packets to the job queue.
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*
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* @return receiver_t object, NULL if initialization fails
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*/
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receiver_t * receiver_create(void);
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#endif /** RECEIVER_H_ @}*/
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