frameassembly 1.1.0

Deterministic network packet crafting DSL and compiler synthesizing nanosecond-accurate PCAPNG captures across 81 L2-L7 protocols (Ethernet, VLAN, MPLS, ARP, IPv4, IPv6, ICMP, BGP, OSPF, WireGuard, IPsec, TCP, UDP, SCTP, DNS, HTTP/2, gRPC, TLS, QUIC, SNMPv3 USM, Modbus, DNP3, S7comm, OPC UA).
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//! Layer 2 data-link protocol and Ethernet frame modifier parsers for FrameAssembly.
//!
//! This module coordinates syntactic combinators for Layer 2 Ethernet headers and data-link
//! protocols, including Address Resolution Protocol (`ARP`), IEEE 802.1Q Virtual LAN (`VLAN`),
//! IEEE 802.1ad Provider Bridging (`QINQ`), RFC 3032 Multi-Protocol Label Switching (`MPLS`),
//! Link Layer Discovery Protocol (`LLDP`), Spanning Tree Protocol (`STP`/`RSTP`), Link
//! Aggregation Control Protocol (`LACP`), and IEEE 802.1X Port-Based Network Access Control (`EAPOL`).

use winnow::ModalResult as PResult;
use winnow::combinator::{alt, cut_err};
use winnow::prelude::*;

use crate::lexer::Token;
use crate::parser::{ParsedField, Stream, parse_mac, parse_u16, tag};

/// Address Resolution Protocol parser.
pub(crate) mod arp;
/// IEEE 802.1X EAPOL parser.
pub(crate) mod eapol;
/// IEEE 802.3ad Link Aggregation Control Protocol parser.
pub(crate) mod lacp;
/// IEEE 802.1AB Link Layer Discovery Protocol parser.
pub(crate) mod lldp;
/// RFC 3032 Multi-Protocol Label Switching parser.
pub(crate) mod mpls;
/// IEEE 802.1ad QinQ dual VLAN parser.
pub(crate) mod qinq;
/// IEEE 802.1D / IEEE 802.1w Spanning Tree Protocol parser.
pub(crate) mod stp;
/// IEEE 802.1Q Virtual Local Area Network parser.
pub(crate) mod vlan;

pub(crate) use arp::*;
pub(crate) use eapol::*;
pub(crate) use lacp::*;
pub(crate) use lldp::*;
pub(crate) use mpls::*;
pub(crate) use qinq::*;
pub(crate) use stp::*;
pub(crate) use vlan::*;

/// Parses a Layer 2 protocol or modifier field from a token stream.
pub(crate) fn parse_l2_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        parse_arp_field,
        parse_vlan_field,
        parse_qinq_field,
        parse_lldp_field,
        parse_stp_field,
        parse_lacp_field,
        parse_eapol_field,
        parse_mpls_field,
        alt((
            (tag(Token::SrcMac), cut_err(parse_mac))
                .map(|((_, s), v)| ParsedField::SrcMac(v, (s.start, s.end - s.start))),
            (tag(Token::DstMac), cut_err(parse_mac))
                .map(|((_, s), v)| ParsedField::DstMac(v, (s.start, s.end - s.start))),
            (tag(Token::EtherType), cut_err(parse_u16))
                .map(|((_, s), v)| ParsedField::EtherType(v, (s.start, s.end - s.start))),
        )),
    ))
    .parse_next(input)
}