69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
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/**
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* @file packetproto.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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* Definitions for PacketProto, a protocol that allows sending of packets
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* over a reliable stream connection.
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*
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* All multi-byte integers in structs are little-endian, unless stated otherwise.
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*
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* Packets are encoded into a stream by representing each packet with:
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* - a 16-bit little-endian unsigned integer representing the length
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* of the payload
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* - that many bytes of payload
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*/
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#ifndef BADVPN_PROTOCOL_PACKETPROTO_H
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#define BADVPN_PROTOCOL_PACKETPROTO_H
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#include <stdint.h>
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#include <limits.h>
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#include <misc/packed.h>
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/**
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* PacketProto packet header.
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* Wraps a single uint16_t in a packed struct for easy access.
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*/
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B_START_PACKED
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struct packetproto_header
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{
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/**
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* Length of the packet payload that follows.
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*/
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uint16_t len;
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} B_PACKED;
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B_END_PACKED
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#define PACKETPROTO_ENCLEN(_len) (sizeof(struct packetproto_header) + (_len))
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#define PACKETPROTO_MAXPAYLOAD UINT16_MAX
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#endif
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