isitme 0.7.0

Is it me? Diagnose whether your network is the problem in a call (Zoom, Teams, Meet).
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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192

//! Ping runner. Spawns system `ping` and parses RTT replies.
//!
//! The I/O surface (spawn, collect stdout) is a thin wrapper around the
//! pure parser `parse_ping_output`. The parser is unit-tested with
//! fixture strings from macOS BSD ping and Linux iputils ping.

use std::process::Command;

use crate::verdict::PingStats;

/// Number of ICMP probes per target. Three keeps it fast (default 1s
/// interval => ~2s per target, run in parallel) while still giving
/// min/avg/max and a rough jitter reading.
pub const PING_COUNT: u32 = 3;

/// Spawn ping for `host`, return parsed stats.
pub fn run_ping(host: &str, count: u32) -> std::io::Result<PingStats> {
    let output = Command::new("ping")
        .arg("-c")
        .arg(count.to_string())
        .arg("-W")
        .arg("2000")
        .arg(host)
        .output()?;

    let stdout = String::from_utf8_lossy(&output.stdout).into_owned();
    let stderr = String::from_utf8_lossy(&output.stderr).into_owned();
    Ok(parse_ping_output(host, count, &stdout, &stderr))
}

/// Async wrapper that runs `run_ping` on a blocking thread so many
/// targets can be pinged concurrently via `tokio::join!` / `join_all`.
pub async fn run_ping_async(host: String, count: u32) -> PingStats {
    let outer_fallback = host.clone();
    let inner_fallback = host.clone();
    let inner = tokio::task::spawn_blocking(move || {
        run_ping(&host, count).unwrap_or_else(|_| PingStats {
            target: inner_fallback,
            samples_ms: Vec::new(),
            packets_sent: count,
            packets_received: 0,
        })
    });
    inner
        .await
        .unwrap_or_else(|_| PingStats {
            target: outer_fallback,
            samples_ms: Vec::new(),
            packets_sent: count,
            packets_received: 0,
        })
}

/// Parse ping stdout into PingStats.
///
/// Handles two output dialects:
/// - macOS BSD: `64 bytes from 8.8.8.8: icmp_seq=0 ttl=119 time=12.345 ms`
/// - Linux iputils: `64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=12.3 ms`
///
/// Both share the `time=<float> ms` token, which is what we extract.
pub fn parse_ping_output(host: &str, sent: u32, stdout: &str, _stderr: &str) -> PingStats {
    let samples = extract_rtts(stdout);
    let received = samples.len() as u32;
    PingStats {
        target: host.to_string(),
        samples_ms: samples,
        packets_sent: sent,
        packets_received: received,
    }
}

/// Extract every `time=<float>` value from the output, in order.
pub fn extract_rtts(stdout: &str) -> Vec<f64> {
    stdout
        .lines()
        .filter_map(extract_time_from_line)
        .collect()
}

/// Pull the `time=X` value out of a single reply line.
fn extract_time_from_line(line: &str) -> Option<f64> {
    let idx = line.find("time=")?;
    let rest = &line[idx + "time=".len()..];
    let num_str: String = rest
        .chars()
        .take_while(|c| c.is_ascii_digit() || *c == '.')
        .collect();
    num_str.parse::<f64>().ok()
}

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

    const MACOS_OUTPUT: &str = "PING 8.8.8.8 (8.8.8.8): 56 data bytes\n\
64 bytes from 8.8.8.8: icmp_seq=0 ttl=119 time=12.345 ms\n\
64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=13.456 ms\n\
64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=11.234 ms\n\
64 bytes from 8.8.8.8: icmp_seq=3 ttl=119 time=14.567 ms\n\n\
--- 8.8.8.8 ping statistics ---\n\
4 packets transmitted, 4 packets received, 0.0% packet loss\n\
round-trip min/avg/max/stddev = 11.234/12.900/14.567/1.234 ms\n";

    const LINUX_OUTPUT: &str = "PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.\n\
64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=12.3 ms\n\
64 bytes from 8.8.8.8: icmp_seq=2 ttl=119 time=13.4 ms\n\
64 bytes from 8.8.8.8: icmp_seq=3 ttl=119 time=11.2 ms\n\n\
--- 8.8.8.8 ping statistics ---\n\
3 packets transmitted, 3 received, 0% packet loss, time 2003ms\n\
rtt min/avg/max/mdev = 11.200/12.300/13.400/0.900 ms\n";

    #[test]
    fn parses_macos_rtts_in_order() {
        let rtts = extract_rtts(MACOS_OUTPUT);
        assert_eq!(rtts, vec![12.345, 13.456, 11.234, 14.567]);
    }

    #[test]
    fn parses_linux_rtts_in_order() {
        let rtts = extract_rtts(LINUX_OUTPUT);
        assert_eq!(rtts, vec![12.3, 13.4, 11.2]);
    }

    fn approx(a: Option<f64>, b: f64) -> bool {
        match a {
            Some(v) => (v - b).abs() < 1e-3,
            None => false,
        }
    }

    #[test]
    fn macos_stats_have_no_loss() {
        let s = parse_ping_output("8.8.8.8", 4, MACOS_OUTPUT, "");
        assert_eq!(s.target, "8.8.8.8");
        assert_eq!(s.packets_sent, 4);
        assert_eq!(s.packets_received, 4);
        assert_eq!(s.loss_pct(), 0.0);
        assert!(approx(s.avg_ms(), 12.9));
    }

    #[test]
    fn linux_stats_have_no_loss() {
        let s = parse_ping_output("8.8.8.8", 3, LINUX_OUTPUT, "");
        assert_eq!(s.packets_sent, 3);
        assert_eq!(s.packets_received, 3);
        assert_eq!(s.loss_pct(), 0.0);
        assert!(approx(s.avg_ms(), 12.3));
    }

    #[test]
    fn packet_loss_when_some_replies_missing() {
        let partial = "PING x (1.2.3.4): 56 data bytes\n\
64 bytes from 1.2.3.4: icmp_seq=0 ttl=64 time=10.000 ms\n\
64 bytes from 1.2.3.4: icmp_seq=2 ttl=64 time=11.000 ms\n";
        let s = parse_ping_output("x", 4, partial, "");
        assert_eq!(s.packets_sent, 4);
        assert_eq!(s.packets_received, 2);
        assert_eq!(s.loss_pct(), 50.0);
    }

    #[test]
    fn empty_output_yields_no_samples() {
        let s = parse_ping_output("x", 4, "", "");
        assert!(s.samples_ms.is_empty());
        assert_eq!(s.packets_sent, 4);
        assert_eq!(s.packets_received, 0);
        assert_eq!(s.loss_pct(), 100.0);
    }

    #[test]
    fn ignores_summary_line_time_field() {
        // The summary line "time 2003ms" must NOT be parsed as an RTT,
        // because it lacks the "time=" token form.
        let summary_only = "--- 8.8.8.8 ping statistics ---\n\
3 packets transmitted, 3 received, 0% packet loss, time 2003ms\n";
        let rtts = extract_rtts(summary_only);
        assert!(rtts.is_empty(), "got {:?}", rtts);
    }

    #[test]
    fn handles_decimal_with_one_digit() {
        let line = "64 bytes from 1.2.3.4: icmp_seq=0 ttl=64 time=5.1 ms";
        assert_eq!(extract_time_from_line(line), Some(5.1));
    }

    #[test]
    fn handles_integer_time() {
        let line = "64 bytes from 1.2.3.4: icmp_seq=0 ttl=64 time=7 ms";
        assert_eq!(extract_time_from_line(line), Some(7.0));
    }
}