frameassembly 1.0.0

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! NDP Layer 3 protocol field 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_u16, tag, ParsedField, Stream};

/// Parses an NDP protocol declaration or option field.
pub(crate) fn parse_ndp_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        alt((
            tag(Token::Ndp).map(|(_, s)| ParsedField::Protocol(Protocol::Ndp, (s.start, s.len()))),
            tag(Token::RouterSolicit).map(|(_, s)| ParsedField::NdpType(NdpType::RouterSolicit, (s.start, s.len()))),
            tag(Token::RouterAdvert).map(|(_, s)| ParsedField::NdpType(NdpType::RouterAdvert, (s.start, s.len()))),
            tag(Token::NeighborSolicit).map(|(_, s)| ParsedField::NdpType(NdpType::NeighborSolicit, (s.start, s.len()))),
            tag(Token::NeighborAdvert).map(|(_, s)| ParsedField::NdpType(NdpType::NeighborAdvert, (s.start, s.len()))),
        )),
        alt((
            (tag(Token::Target), cut_err(parse_ip)).map(|((_, s), v)| ParsedField::TargetVal(Some(v), None, (s.start, s.end - s.start))),
            (tag(Token::Slla), cut_err(parse_mac)).map(|((_, s), v)| ParsedField::Slla(v, (s.start, s.end - s.start))),
            (tag(Token::Tlla), cut_err(parse_mac)).map(|((_, s), v)| ParsedField::Tlla(v, (s.start, s.end - s.start))),
            (tag(Token::RouterLifetime), cut_err(parse_u16)).map(|((_, s), v)| ParsedField::RouterLifetime(v, (s.start, s.end - s.start))),
        )),
    ))
    .parse_next(input)
}