91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
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/**
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* @file PacketRecvBlocker.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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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 are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING 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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* @section DESCRIPTION
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*
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* {@link PacketRecvInterface} layer which blocks all output recv calls and only
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* passes a single blocked call on to input when the user wants so.
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*/
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#ifndef BADVPN_FLOW_PACKETRECVBLOCKER_H
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#define BADVPN_FLOW_PACKETRECVBLOCKER_H
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#include <stdint.h>
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#include <base/DebugObject.h>
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#include <flow/PacketRecvInterface.h>
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/**
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* {@link PacketRecvInterface} layer which blocks all output recv calls and only
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* passes a single blocked call on to input when the user wants so.
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*/
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typedef struct {
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PacketRecvInterface output;
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int out_have;
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uint8_t *out;
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int out_input_blocking;
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PacketRecvInterface *input;
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DebugObject d_obj;
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} PacketRecvBlocker;
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/**
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* Initializes the object.
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*
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* @param o the object
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* @param input input interface
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*/
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void PacketRecvBlocker_Init (PacketRecvBlocker *o, PacketRecvInterface *input, BPendingGroup *pg);
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/**
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* Frees the object.
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*
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* @param o the object
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*/
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void PacketRecvBlocker_Free (PacketRecvBlocker *o);
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/**
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* Returns the output interface.
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* The MTU of the output interface will be the same as of the input interface.
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*
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* @param o the object
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* @return output interface
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*/
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PacketRecvInterface * PacketRecvBlocker_GetOutput (PacketRecvBlocker *o);
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/**
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* Passes a blocked output recv call to input if there is one and it has not
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* been passed yet. Otherwise it does nothing.
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* Must not be called from input Recv calls.
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* This function may invoke I/O.
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*
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* @param o the object
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*/
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void PacketRecvBlocker_AllowBlockedPacket (PacketRecvBlocker *o);
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#endif
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