frameassembly 1.0.0

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! Address Resolution Protocol (ARP) parser.

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

use crate::ast::*;
use crate::lexer::Token;
use crate::parser::{parse_ip, parse_mac, parse_raw_string_lit, tag, ParsedField, Stream};

/// Parses an ARP protocol declaration or field.
pub(crate) fn parse_arp_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        tag(Token::Arp).map(|(_, s)| ParsedField::Protocol(Protocol::Arp, (s.start, s.len()))),
        tag(Token::Request).map(|(_, s)| ParsedField::ArpOpcode(ArpOpcode::Request, (s.start, s.len()))),
        alt((
            (tag(Token::Reply), parse_raw_string_lit).map(|((_, s), v)| {
                ParsedField::L7StringField("REPLY", v, (s.start, s.end - s.start))
            }),
            tag(Token::Reply).map(|(_, s)| {
                ParsedField::ArpOpcode(ArpOpcode::Reply, (s.start, s.len()))
            }),
        )),
        alt((tag(Token::Gratuitous), tag(Token::Garp))).map(|(_, s)| ParsedField::Gratuitous((s.start, s.len()))),
        (alt((tag(Token::Sha), tag(Token::SenderMac))), cut_err(parse_mac)).map(|((_, s), v)| ParsedField::Sha(v, (s.start, s.end - s.start))),
        (alt((tag(Token::Spa), tag(Token::SenderIp))), cut_err(parse_ip)).map(|((_, s), v)| ParsedField::Spa(v, (s.start, s.end - s.start))),
        (alt((tag(Token::Tha), tag(Token::TargetMac))), cut_err(parse_mac)).map(|((_, s), v)| ParsedField::Tha(v, (s.start, s.end - s.start))),
        (alt((tag(Token::Tpa), tag(Token::TargetIp))), cut_err(parse_ip)).map(|((_, s), v)| ParsedField::Tpa(v, (s.start, s.end - s.start))),
    ))
    .parse_next(input)
}