haprox-rs 0.2.3

A HaProxy protocol parser.
Documentation 
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/*-
 * haprox-rs - a HaProxy protocol parser.
 * 
 * Copyright 2025 Aleksandr Morozov
 * The scram-rs crate can be redistributed and/or modified
 * under the terms of either of the following licenses:
 *
 *   1. the Mozilla Public License Version 2.0 (the “MPL”) OR
 *                     
 *   2. EUROPEAN UNION PUBLIC LICENCE v. 1.2 EUPL © the European Union 2007, 2016
 */

/// Characters match the US-ASCII representation of "PROXY" (not-supported)
pub const HEADER_MAGIC_V1: &[u8] = b"\x50\x52\x4F\x58\x59";

/// Binary header format starts with a constant 12 bytes.
pub const HEADER_MAGIC_V2: &[u8] = b"\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A";

/// Binary header format starts with a constant 12 bytes.
pub const MSG_HEADER_LOCAL_V2: &[u8] = b"\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A\x20\x00\x00\x00";

/// Length if the `HEADER_MAGIC_V2`
pub const HEADER_MAGINC_LEN: usize = HEADER_MAGIC_V2.len();

pub const HEADER_UNIX_ADDR_LEN: usize = 108;

#[repr(C, packed)]
pub struct PP2TlvSsl
{
    pub client: u8,
    pub verify: u32,
    pub data: [u8; 0],
}

#[repr(C, packed)]
pub struct PP2Tlv
{
    pub mtype: u8,
    pub length_hi: u8,
    pub length_lo: u8,
    pub value: [u8; 0],
}

#[repr(C, packed)]
#[derive(Clone, Copy, Debug)]
pub struct Ipv4Addr
{
    pub src_addr: u32,
    pub dst_addr: u32,
    pub src_port: u16,
    pub dst_port: u16
}

#[repr(C, packed)]
#[derive(Clone, Copy, Debug)]
pub struct Ipv6Addr
{
    pub src_addr: [u8; 16],
    pub  dst_addr: [u8; 16],
    pub src_port: u16,
    pub dst_port: u16
}

#[repr(C, packed)]
#[derive(Clone, Copy, Debug)]
pub struct UnixAddr
{
    pub src_addr: [u8; HEADER_UNIX_ADDR_LEN],
    pub dst_addr: [u8; HEADER_UNIX_ADDR_LEN],
}

#[repr(C, packed)]
pub union ProxyAddr
{
    pub ipv4_addr: Ipv4Addr,
    pub ipv6_addr: Ipv6Addr,
    pub unix_addr: UnixAddr,
}

#[repr(C, packed)]
pub struct ProxyHdrV2
{
    /// [HEADER_MAGIC] const
    pub signature: [u8; HEADER_MAGINC_LEN],

    /// protocol version and command 
    pub ver_cmd: u8,

    /// protocol family and address
    pub fam: u8,

    /// number of following bytes part of the header
    pub len: u16,

    ///   17th byte, addresses in network byte order.
    pub address: [u8; 0]//ProxyAddr,
}

impl ProxyHdrV2
{
    pub const VERSION_MASK: u8 = 0xF0;
    pub const COMMAND_MASK: u8 = 0x0F;
    pub const TRANSPT_MASK: u8 = 0x0F;
    pub const ADDRESS_MASK: u8 = 0xF0;

    pub const VERSION_RAW: u8 = 0x20;

    pub const HEADER_LEN: usize = size_of::<Self>();
    pub const HEADER_ADDR_LEN: usize = size_of::<Self>() + size_of::<ProxyAddr>();
}