soth-mitm 0.2.1

Rust intercepting proxy crate with deterministic handler/event contracts for SOTH.
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
134
135
136
137
138
139
140
141
142
143
144
145

use std::net::IpAddr;

use super::ConnectionInfo;
use crate::types::SocketFamily;

#[cfg(target_os = "linux")]
mod linux;
#[cfg(target_os = "macos")]
mod macos;
#[cfg(target_os = "windows")]
mod windows;

#[derive(Debug, Clone, Copy)]
struct SocketQuery {
    local_ip: IpAddr,
    local_port: u16,
    remote_ip: IpAddr,
    remote_port: u16,
}

impl SocketQuery {
    fn from_connection(connection: &ConnectionInfo) -> Option<Self> {
        match connection.socket_family {
            SocketFamily::TcpV4 { local, remote } => Some(Self {
                local_ip: IpAddr::V4(*local.ip()),
                local_port: local.port(),
                remote_ip: IpAddr::V4(*remote.ip()),
                remote_port: remote.port(),
            }),
            SocketFamily::TcpV6 { local, remote } => Some(Self {
                local_ip: IpAddr::V6(*local.ip()),
                local_port: local.port(),
                remote_ip: IpAddr::V6(*remote.ip()),
                remote_port: remote.port(),
            }),
            SocketFamily::UnixDomain { .. } => None,
        }
    }
}

pub(crate) fn lookup_established_tcp_pid(connection: &ConnectionInfo) -> Option<u32> {
    let query = SocketQuery::from_connection(connection)?;

    #[cfg(target_os = "macos")]
    {
        macos::lookup_established_tcp_pid_macos(query)
    }

    #[cfg(target_os = "linux")]
    {
        return linux::lookup_established_tcp_pid_linux(query);
    }

    #[cfg(target_os = "windows")]
    {
        return windows::lookup_established_tcp_pid_windows(query);
    }

    #[cfg(not(any(target_os = "macos", target_os = "linux", target_os = "windows")))]
    {
        let _ = query;
        None
    }
}

fn ip_matches(candidate: IpAddr, expected: IpAddr) -> bool {
    if candidate == expected || is_unspecified_ip(expected) {
        return true;
    }

    match (candidate, expected) {
        (IpAddr::V6(v6), IpAddr::V4(v4)) | (IpAddr::V4(v4), IpAddr::V6(v6)) => {
            v6.to_ipv4().map(|mapped| mapped == v4).unwrap_or(false)
        }
        _ => false,
    }
}

fn is_unspecified_ip(value: IpAddr) -> bool {
    match value {
        IpAddr::V4(ip) => ip.is_unspecified(),
        IpAddr::V6(ip) => ip.is_unspecified(),
    }
}

fn push_unique_pid(candidates: &mut Vec<u32>, pid: u32) {
    if !candidates.contains(&pid) {
        candidates.push(pid);
    }
}

fn select_unique_pid(candidates: Vec<u32>) -> Option<u32> {
    if candidates.len() == 1 {
        Some(candidates[0])
    } else {
        None
    }
}

#[cfg(test)]
mod tests {
    use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

    use super::{ip_matches, select_unique_pid};

    #[test]
    fn ip_match_requires_exact_value_when_expected_is_not_unspecified() {
        assert!(ip_matches(
            IpAddr::V4(Ipv4Addr::LOCALHOST),
            IpAddr::V4(Ipv4Addr::LOCALHOST)
        ));
        assert!(!ip_matches(
            IpAddr::V4(Ipv4Addr::LOCALHOST),
            IpAddr::V4(Ipv4Addr::new(10, 0, 0, 1))
        ));
    }

    #[test]
    fn unspecified_expected_ip_matches_any_candidate() {
        assert!(ip_matches(
            IpAddr::V4(Ipv4Addr::LOCALHOST),
            IpAddr::V4(Ipv4Addr::UNSPECIFIED)
        ));
        assert!(ip_matches(
            IpAddr::V6(Ipv6Addr::LOCALHOST),
            IpAddr::V6(Ipv6Addr::UNSPECIFIED)
        ));
    }

    #[test]
    fn ipv4_mapped_ipv6_comparison_is_supported() {
        let mapped = IpAddr::V6(Ipv4Addr::new(127, 0, 0, 1).to_ipv6_mapped());
        assert!(ip_matches(mapped, IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1))));
    }

    #[test]
    fn unique_pid_selection_rejects_ambiguous_candidates() {
        assert_eq!(select_unique_pid(vec![10, 20]), None);
    }

    #[test]
    fn unique_pid_selection_accepts_single_candidate() {
        assert_eq!(select_unique_pid(vec![42]), Some(42));
    }
}