├── .gitignore
├── src
    ├── main.rs
    ├── cli.rs
    ├── network.rs
    └── audio.rs
├── Cargo.toml
├── LICENSE
├── README.md
└── Cargo.lock


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | .vscode
3 | 


--------------------------------------------------------------------------------
/src/main.rs:
--------------------------------------------------------------------------------
 1 | use std::sync::Arc;
 2 | 
 3 | mod audio;
 4 | mod cli;
 5 | mod network;
 6 | 
 7 | fn main() -> anyhow::Result<()> {
 8 |     cli::print_banner();
 9 | 
10 |     let (counter, _stream) = audio::start()?;
11 | 
12 |     let interface = cli::parse_interface_from_args()?;
13 |     network::start_capture(interface, Arc::clone(&counter))?;
14 | 
15 |     Ok(())
16 | }
17 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | authors = ["Vesa Vilhonen <vesa@vilhonen.com>"]
 3 | categories = ["command-line-utilities"]
 4 | description = "Listen to your network traffic with"
 5 | edition = "2018"
 6 | license = "ISC"
 7 | name = "nethoscope"
 8 | readme = "README.md"
 9 | repository = "https://github.com/vvilhonen/nethoscope"
10 | version = "0.1.1"
11 | 
12 | [profile.release]
13 | debug = true
14 | 
15 | [dependencies]
16 | anyhow = "1"
17 | cpal = "0.13"
18 | pcap = "0.8"
19 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2021 Vesa Vilhonen
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Nethoscope
 2 | 
 3 | Employ your built-in wetware pattern recognition and signal processing facilities to understand your network traffic.
 4 | 
 5 | > Check video on how it works at https://www.youtube.com/watch?v=j1fqy6CmmeM
 6 | 
 7 | ## Installation with [cargo](https://rustup.rs/)
 8 | 
 9 |     cargo install nethoscope
10 | 
11 | There are various dependencies on each platform described below:
12 | 
13 | ### macOS
14 | 
15 | Pcap should be included with the macOS so no extra steps required.
16 | 
17 | ### Linux
18 | 
19 | On debian based systems `libpcap-dev` package should be enough. More information [here](https://github.com/ebfull/pcap#linux).
20 | 
21 | ### Windows
22 | 
23 | Windows requires pcap compatible library for which the [npcap](https://nmap.org/npcap/) is the best option. 
24 | 
25 | For using [the binary](https://github.com/vvilhonen/nethoscope/releases) you only need the [npcap installer](https://nmap.org/npcap/dist/npcap-1.10.exe) and for compiling from source, `Lib/x64/wpcap.lib` file needs to be copied to the project root from the [npcap SDK](https://nmap.org/npcap/dist/npcap-sdk-1.06.zip), in addition.
26 | 
27 | ## Credits
28 | 
29 | This experiment was easily implemented building on these two excellent crates:
30 | 
31 | - [pcap](https://github.com/ebfull/pcap) to capture network traffic
32 | - [cpal](https://github.com/RustAudio/cpal) to output audio
33 | 
34 | 


--------------------------------------------------------------------------------
/src/cli.rs:
--------------------------------------------------------------------------------
 1 | use std::io::{stdout, Write};
 2 | 
 3 | pub fn print_banner() {
 4 |     eprintln!(
 5 |         "\n\x1b[1mNethoscope 🩺 {}\x1b[0m\n",
 6 |         env!("CARGO_PKG_VERSION")
 7 |     );
 8 | }
 9 | 
10 | pub fn print_progress() -> anyhow::Result<()> {
11 |     stdout().write(b".")?;
12 |     stdout().flush()?;
13 |     Ok(())
14 | }
15 | 
16 | pub fn parse_interface_from_args() -> anyhow::Result<Option<String>> {
17 |     let mut args = std::env::args().collect::<Vec<_>>();
18 |     if args
19 |         .iter()
20 |         .any(|arg| arg.starts_with("-h") || arg.starts_with("--help"))
21 |     {
22 |         eprintln!(
23 |             "Usage: {} <\x1b[4minterface name\x1b[0m or omit for the default>\n",
24 |             args[0]
25 |         );
26 | 
27 |         eprintln!("Available interfaces:");
28 |         for device in super::network::available_interfaces()? {
29 |             eprintln!(
30 |                 "name: {}\tdescription: {}",
31 |                 device.name,
32 |                 device.desc.unwrap_or("<no description>".to_owned())
33 |             );
34 |         }
35 | 
36 |         std::process::exit(0);
37 |     } else if args.len() == 2 {
38 |         Ok(Some(args.remove(1)))
39 |     } else {
40 |         Ok(None)
41 |     }
42 | }
43 | 
44 | #[cfg(unix)]
45 | pub fn create_capture_permission_instruction() -> String {
46 |     format!(
47 |         "Couldn't start capture. Run `sudo setcap cap_net_raw,cap_net_admin=eip {}`",
48 |         std::env::current_exe().unwrap().display()
49 |     )
50 | }
51 | 
52 | #[cfg(not(unix))]
53 | pub fn create_capture_permission_instruction() -> String {
54 |     format!("Couldn't start capture. Run with sudo or other with super user privileges")
55 | }
56 | 


--------------------------------------------------------------------------------
/src/network.rs:
--------------------------------------------------------------------------------
 1 | use std::sync::atomic::AtomicUsize;
 2 | use std::sync::atomic::Ordering;
 3 | use std::sync::Arc;
 4 | 
 5 | use anyhow::Context;
 6 | 
 7 | pub fn start_capture(
 8 |     interface_name: Option<String>,
 9 |     counter: Arc<AtomicUsize>,
10 | ) -> anyhow::Result<()> {
11 |     let device = match interface_name {
12 |         Some(interface_name) => {
13 |             let devices = pcap::Device::list().context("Listing network devices")?;
14 | 
15 |             devices
16 |                 .into_iter()
17 |                 .find(|x| x.name == interface_name)
18 |                 .with_context(|| format!("No device named {}", interface_name))
19 |         }
20 |         _ => pcap::Device::lookup().context("Couldn't look up default capture device"),
21 |     }?;
22 | 
23 |     eprintln!(
24 |         "Capturing using {} ({})",
25 |         device.desc.clone().unwrap_or("N/A".to_owned()),
26 |         device.name
27 |     );
28 |     eprintln!("Run with \"-h\" to see how to capture with another network device\n");
29 | 
30 |     let mut cap = pcap::Capture::from_device(device)
31 |         .and_then(|device| device.immediate_mode(true).open())
32 |         .with_context(crate::cli::create_capture_permission_instruction)?;
33 | 
34 |     loop {
35 |         match cap.next() {
36 |             Ok(_pck) => {
37 |                 counter.fetch_add(1, Ordering::SeqCst);
38 |             }
39 |             Err(pcap::Error::TimeoutExpired) => (),
40 |             Err(e) => {
41 |                 eprintln!("Unknown capture error {}", e);
42 |                 std::process::exit(1);
43 |             }
44 |         };
45 |     }
46 | }
47 | 
48 | pub fn available_interfaces() -> anyhow::Result<Vec<pcap::Device>> {
49 |     Ok(pcap::Device::list()?)
50 | }
51 | 


--------------------------------------------------------------------------------
/src/audio.rs:
--------------------------------------------------------------------------------
 1 | use std::f32::consts::PI;
 2 | use std::sync::atomic::AtomicUsize;
 3 | use std::sync::atomic::Ordering;
 4 | use std::sync::Arc;
 5 | 
 6 | use anyhow::Context;
 7 | use cpal::traits::{DeviceTrait, HostTrait, StreamTrait};
 8 | 
 9 | const FREQS: [usize; 7] = [440, 494, 523, 587, 659, 698, 784];
10 | 
11 | pub fn start() -> anyhow::Result<(Arc<AtomicUsize>, cpal::Stream)> {
12 |     let host = cpal::default_host();
13 |     let device = host
14 |         .default_output_device()
15 |         .context("Couldn't open default audio output device")?;
16 |     let config = device.default_output_config()?;
17 | 
18 |     println!(
19 |         "Audio output with {} and config {:?}\n",
20 |         device.name()?,
21 |         config
22 |     );
23 | 
24 |     let sample_rate = config.sample_rate().0 as f32;
25 |     let channels = config.channels() as usize;
26 | 
27 |     let mut freq = FrequencyFinder::new();
28 |     let counter = Arc::new(AtomicUsize::new(0));
29 |     let counter2 = Arc::clone(&counter);
30 | 
31 |     let mut index = 0f32;
32 |     let mut samples_left = 0;
33 |     let mut frequency = 0.0;
34 | 
35 |     let mut next_value = move || {
36 |         if samples_left == 0 {
37 |             let count = counter.swap(0, Ordering::SeqCst);
38 |             index = 0.0;
39 | 
40 |             if count == 0 {
41 |                 frequency = 0.0;
42 |                 samples_left = 440;
43 |             } else {
44 |                 crate::cli::print_progress().unwrap();
45 |                 samples_left = freq.freq(count);
46 |                 frequency = samples_left as f32;
47 |                 samples_left *= 10;
48 |             }
49 |         }
50 | 
51 |         samples_left -= 1;
52 |         index = (index + 1.0) % sample_rate;
53 |         (index * frequency * 2.0 * PI / sample_rate).sin() * 0.5
54 |     };
55 | 
56 |     let stream = device.build_output_stream(
57 |         &config.into(),
58 |         move |data: &mut [f32], _| {
59 |             // println!("Writing {} bytes", data.len());
60 |             for frame in data.chunks_mut(channels) {
61 |                 let value = next_value();
62 |                 for sample in frame.iter_mut() {
63 |                     *sample = value;
64 |                 }
65 |             }
66 |         },
67 |         |err| panic!("{}", err),
68 |     )?;
69 | 
70 |     stream.play()?;
71 | 
72 |     Ok((counter2, stream))
73 | }
74 | 
75 | pub struct FrequencyFinder {
76 |     max: usize,
77 | }
78 | 
79 | impl FrequencyFinder {
80 |     pub fn new() -> Self {
81 |         FrequencyFinder { max: 0 }
82 |     }
83 | 
84 |     pub fn freq(&mut self, pkt_size: usize) -> usize {
85 |         if pkt_size > self.max {
86 |             self.max = pkt_size
87 |         }
88 |         let idx = (pkt_size as f32 / self.max as f32 * 6.0).round() as usize;
89 |         FREQS[idx]
90 |     }
91 | }
92 | 


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------