1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

use super::{parse_data_structure, parse_delimiter, parse_string_parameter};
use crate::Event;
use crate::FilterPhase;
use crate::SubSystem;
use crate::TimeVal;
use nom::branch::alt;
use nom::bytes::streaming::tag;
use nom::character::streaming::digit1;
use nom::combinator::map_res;
use nom::IResult;

pub struct ReportEntry {
    pub version: String,
    pub timestamp: TimeVal,
    pub subsystem: SubSystem,
    pub event: Event,
    pub session_id: String,
}

pub struct FilterEntry {
    pub version: String,
    pub timestamp: TimeVal,
    pub subsystem: SubSystem,
    pub phase: FilterPhase,
    pub session_id: String,
    pub token: String,
}

pub(crate) enum EntryOption {
    Report(ReportEntry),
    Filter(FilterEntry),
}

pub(crate) fn parse_entry(input: &[u8]) -> IResult<&[u8], EntryOption> {
    let (input, entry) = alt((parse_report_entry_meta, parse_filter_entry_meta))(input)?;
    Ok((input, entry))
}

fn parse_report_entry_meta(input: &[u8]) -> IResult<&[u8], EntryOption> {
    let (input, _) = tag("report")(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, entry) = parse_report_entry(input)?;
    Ok((input, EntryOption::Report(entry)))
}

fn parse_filter_entry_meta(input: &[u8]) -> IResult<&[u8], EntryOption> {
    let (input, _) = tag("filter")(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, entry) = parse_filter_entry(input)?;
    Ok((input, EntryOption::Filter(entry)))
}

fn parse_report_entry(input: &[u8]) -> IResult<&[u8], ReportEntry> {
    let (input, version) = parse_string_parameter(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, timestamp) = parse_timestamp(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, subsystem) = parse_data_structure::<SubSystem>(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, event) = parse_data_structure::<Event>(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, session_id) = parse_string_parameter(input)?;
    let entry = ReportEntry {
        version,
        timestamp,
        subsystem,
        event,
        session_id,
    };
    Ok((input, entry))
}

fn parse_filter_entry(input: &[u8]) -> IResult<&[u8], FilterEntry> {
    let (input, version) = parse_string_parameter(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, timestamp) = parse_timestamp(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, subsystem) = parse_data_structure::<SubSystem>(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, phase) = parse_data_structure::<FilterPhase>(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, session_id) = parse_string_parameter(input)?;
    let (input, _) = parse_delimiter(input)?;
    let (input, token) = parse_string_parameter(input)?;
    let entry = FilterEntry {
        version,
        timestamp,
        subsystem,
        phase,
        session_id,
        token,
    };
    Ok((input, entry))
}

fn parse_timestamp(input: &[u8]) -> IResult<&[u8], TimeVal> {
    let (input, sec) = map_res(digit1, |s| String::from_utf8_lossy(s).parse::<i64>())(input)?;
    let (input, _) = tag(".")(input)?;
    let (input, usec) = map_res(digit1, |s| {
        format!("{:0<6}", String::from_utf8_lossy(s)).parse::<i64>()
    })(input)?;
    let timestamp = TimeVal { sec, usec };
    Ok((input, timestamp))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_report_link_connect() {
        let input = b"report|0.5|1576146008.06099|smtp-in|link-connect|7641df9771b4ed00|mail.openbsd.org|pass|199.185.178.25:33174|45.77.67.80:25";
        let res = parse_entry(input);
        assert!(res.is_ok());
        let (_, res) = res.unwrap();
        let res = match res {
            EntryOption::Report(r) => r,
            _ => {
                assert!(false);
                return;
            }
        };
        assert_eq!(res.version, String::from("0.5"));
        assert_eq!(
            res.timestamp,
            TimeVal {
                sec: 1576146008,
                usec: 60990
            }
        );
        assert_eq!(res.subsystem, SubSystem::SmtpIn);
        assert_eq!(res.event, Event::LinkConnect);
        assert_eq!(res.session_id, String::from("7641df9771b4ed00"));
    }
}