frameassembly 1.0.1

A Domain-Specific Language (DSL) for writing deterministic network traffic to .pcap files.
Documentation 
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//! Kerberos Layer 7 authentication 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_str_val, parse_u32, tag, ParsedField, Stream};

/// Parses a Kerberos protocol declaration or ticket field.
pub(crate) fn parse_kerberos_field<'i, 'a>(input: &mut Stream<'i, 'a>) -> PResult<ParsedField<'a>> {
    alt((
        alt((
            tag(Token::Kerberos).map(|(_, s)| ParsedField::Protocol(Protocol::Kerberos, (s.start, s.len()))),
            tag(Token::AsReq).map(|(_, s)| ParsedField::L7Flag("AS_REQ", (s.start, s.len()))),
            tag(Token::AsRep).map(|(_, s)| ParsedField::L7Flag("AS_REP", (s.start, s.len()))),
            tag(Token::TgsReq).map(|(_, s)| ParsedField::L7Flag("TGS_REQ", (s.start, s.len()))),
            tag(Token::TgsRep).map(|(_, s)| ParsedField::L7Flag("TGS_REP", (s.start, s.len()))),
        )),
        alt((
            tag(Token::KrbError).map(|(_, s)| ParsedField::L7Flag("KRB_ERROR", (s.start, s.len()))),
            (tag(Token::Realm), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("REALM", v, (s.start, s.end - s.start))),
            (tag(Token::Cname), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("CNAME", v, (s.start, s.end - s.start))),
            (tag(Token::Sname), cut_err(parse_str_val)).map(|((_, s), v)| ParsedField::L7StringField("SNAME", v, (s.start, s.end - s.start))),
            (tag(Token::Etype), cut_err(parse_u32)).map(|((_, s), v)| ParsedField::L7U32Field("ETYPE", v, (s.start, s.end - s.start))),
        )),
    ))
    .parse_next(input)
}