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hooks.h
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hooks.h
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/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Copyright 2003 Christian Kreibich <christian.kreibich@cl.cam.ac.uk>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
*/
#ifndef _HOOKS_H_
#define _HOOKS_H_
typedef enum {
HD_INCOMING,
HD_OUTGOING,
HD_INCOMING_STREAM, /* just the payload that is actually new */
HD_DIR_MAX
} HD_Direction;
/**
* HD_PacketCallback - hook implementation signature.
* @packet_data: raw packet data.
* @packet_len: length of data.
* @user_data: arbitrary user data.
*
* This is the signature for packet hook callbacks. Users can register
* functions of this signature to be called when packets containing certain
* protocol headers are received or sent. The packet data is then passed
* in via @packet_data. @user_data contains the value specified when
* the callback got registered using hooks_add_packet_hook().
*/
struct tuple;
typedef void (*HD_PacketCallback) (struct tuple *conhdr,
u_char *packet_data, u_int packet_len, void *user_data);
/**
* hooks_init - hook system initializer.
*
* The function initializes the data structures that manage the hooks.
*/
void hooks_init(void);
/**
* hooks_add_packet_hook - adds a callback for a particular protocol.
* @protocol: number of protocol, a %IP_PROTO_xxx value.
* @dir: whether the hook is for incoming or outgoing packets.
* @callback: callback used when a packet of type @protocol is encountered.
* @user_data: arbitrary data to pass to the callback.
*
* The function registers @callback to be called whenever packets of type
* @protocol are encountered.
*/
void hooks_add_packet_hook(int protocol, HD_Direction dir,
HD_PacketCallback callback,
void *user_data);
/**
* hooks_remove_packet_hook - removes a callback.
* @protocol: number of protocol, a %IP_PROTO_xxx value.
* @dir: whether the hook for incoming or outgoing packets is to be removed.
* @callback: callback to remove.
*
* The function removes @callback from the list of registered callbacks for
* packets of type @protocol.
*/
void hooks_remove_packet_hook(int protocol, HD_Direction dir, HD_PacketCallback callback);
/**
* hooks_dispatch - callback dispatcher.
* @protocol: number of protocol, a %IP_PROTO_xxx value.
* @dir: incoming or outcoming.
* @packet_data: packet to dispatch to callbacks.
* @packet_len: length of packet data.
*
* The function calls all the registered callbacks for protocol type
* @protocol, passing them the given @packet_data.
*/
void hooks_dispatch(int protocol, HD_Direction dir, struct tuple *conhdr,
u_char *packet_data, u_int packet_len);
#endif