dsct 0.2.8

LLM-friendly packet dissector CLI
Documentation 
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

use std::collections::HashMap;
use std::net::IpAddr;

use packet_dissector_core::packet::Packet;

use super::TalkerEntry;
use super::helpers::extract_ip_addr_pair;

#[derive(Debug, Default)]
struct TrafficCount {
    packets: u64,
    bytes: u64,
}

/// Collects IP pair traffic statistics.
#[derive(Debug)]
pub struct TopTalkersCollector {
    pairs: HashMap<(IpAddr, IpAddr), TrafficCount>,
}

impl Default for TopTalkersCollector {
    fn default() -> Self {
        Self::new()
    }
}

impl TopTalkersCollector {
    pub fn new() -> Self {
        Self {
            pairs: HashMap::new(),
        }
    }

    pub fn process_packet(&mut self, packet: &Packet, original_length: u32) {
        let Some((src, dst)) = extract_ip_addr_pair(packet) else {
            return;
        };

        let entry = self.pairs.entry((src, dst)).or_default();
        entry.packets += 1;
        entry.bytes += original_length as u64;
    }

    pub fn finalize(self, top_n: usize) -> Vec<TalkerEntry> {
        let mut entries: Vec<TalkerEntry> = self
            .pairs
            .into_iter()
            .map(|((src, dst), tc)| TalkerEntry {
                src: src.to_string(),
                dst: dst.to_string(),
                packets: tc.packets,
                bytes: tc.bytes,
            })
            .collect();
        entries.sort_by(|a, b| {
            b.bytes
                .cmp(&a.bytes)
                .then_with(|| b.packets.cmp(&a.packets))
        });
        entries.truncate(top_n);
        entries
    }
}

#[cfg(test)]
mod tests {
    use super::super::test_helpers::{build_ipv4_buf, pkt};
    use super::*;
    use packet_dissector_core::field::FieldValue;
    use packet_dissector_core::packet::DissectBuffer;
    use packet_dissector_test_alloc::test_desc;

    #[test]
    fn top_talkers_basic() {
        let mut c = TopTalkersCollector::new();
        let p1 = build_ipv4_buf([10, 0, 0, 1], [10, 0, 0, 2]);
        c.process_packet(&pkt(&p1), 100);
        c.process_packet(&pkt(&p1), 200);
        let p2 = build_ipv4_buf([10, 0, 0, 3], [10, 0, 0, 4]);
        c.process_packet(&pkt(&p2), 500);

        let result = c.finalize(10);
        assert_eq!(result.len(), 2);
        // Sorted by bytes descending
        assert_eq!(result[0].src, "10.0.0.3");
        assert_eq!(result[0].dst, "10.0.0.4");
        assert_eq!(result[0].bytes, 500);
        assert_eq!(result[0].packets, 1);
        assert_eq!(result[1].src, "10.0.0.1");
        assert_eq!(result[1].dst, "10.0.0.2");
        assert_eq!(result[1].bytes, 300);
        assert_eq!(result[1].packets, 2);
    }

    #[test]
    fn top_talkers_ipv6() {
        let mut c = TopTalkersCollector::new();
        let mut buf = DissectBuffer::new();
        buf.begin_layer("IPv6", None, &[], 0..40);
        buf.push_field(
            test_desc("src", "Source"),
            FieldValue::Ipv6Addr([0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]),
            8..24,
        );
        buf.push_field(
            test_desc("dst", "Destination"),
            FieldValue::Ipv6Addr([0x20, 0x01, 0x0d, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2]),
            24..40,
        );
        buf.end_layer();
        c.process_packet(&pkt(&buf), 100);
        let result = c.finalize(10);
        assert_eq!(result.len(), 1);
        assert_eq!(result[0].src, "2001:db8::1");
        assert_eq!(result[0].dst, "2001:db8::2");
    }

    #[test]
    fn top_talkers_empty() {
        let c = TopTalkersCollector::new();
        let result = c.finalize(10);
        assert!(result.is_empty());
    }

    #[test]
    fn top_talkers_no_ip_layer() {
        let mut c = TopTalkersCollector::new();
        let buf = DissectBuffer::new(); // No layers
        c.process_packet(&pkt(&buf), 100);
        let result = c.finalize(10);
        assert!(result.is_empty());
    }
}