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|
#![deny(clippy::all)]
mod display;
mod network;
mod os;
#[cfg(test)]
mod tests;
use display::{RawTerminalBackend, Ui};
use network::{
dns::{self, IpTable},
Connection, Sniffer, Utilization,
};
use os::OnSigWinch;
use ::pnet::datalink::{DataLinkReceiver, NetworkInterface};
use ::std::collections::HashMap;
use ::std::sync::atomic::{AtomicBool, Ordering};
use ::std::sync::{Arc, Mutex};
use ::std::thread::park_timeout;
use ::std::{thread, time};
use ::termion::event::{Event, Key};
use ::tui::backend::Backend;
use std::process;
use ::std::io;
use ::std::time::Instant;
use ::termion::raw::IntoRawMode;
use ::tui::backend::TermionBackend;
use structopt::StructOpt;
#[derive(StructOpt, Debug)]
#[structopt(name = "what")]
pub struct Opt {
#[structopt(short, long)]
/// The network interface to listen on, eg. eth0
interface: String,
#[structopt(short, long)]
/// Machine friendlier output
raw: bool,
#[structopt(short, long)]
/// Do not attempt to resolve IPs to their hostnames
no_resolve: bool,
}
fn main() {
if let Err(err) = try_main() {
eprintln!("Error: {}", err);
process::exit(2);
}
}
fn try_main() -> Result<(), failure::Error> {
#[cfg(target_os = "windows")]
compile_error!("Sorry, no implementations for Windows yet :( - PRs welcome!");
use os::get_input;
let opts = Opt::from_args();
let os_input = get_input(&opts.interface, !opts.no_resolve)?;
let raw_mode = opts.raw;
if raw_mode {
let terminal_backend = RawTerminalBackend {};
start(terminal_backend, os_input, opts);
} else {
match io::stdout().into_raw_mode() {
Ok(stdout) => {
let terminal_backend = TermionBackend::new(stdout);
start(terminal_backend, os_input, opts);
}
Err(_) => failure::bail!(
"Failed to get stdout: 'what' does not (yet) support piping, is it being piped?"
),
}
}
Ok(())
}
pub struct OsInputOutput {
pub network_interface: NetworkInterface,
pub network_frames: Box<dyn DataLinkReceiver>,
pub get_open_sockets: fn() -> HashMap<Connection, String>,
pub keyboard_events: Box<dyn Iterator<Item = Event> + Send>,
pub dns_client: Option<dns::Client>,
pub on_winch: Box<OnSigWinch>,
pub cleanup: Box<dyn Fn() + Send>,
pub write_to_stdout: Box<dyn FnMut(String) + Send>,
}
pub fn start<B>(terminal_backend: B, os_input: OsInputOutput, opts: Opt)
where
B: Backend + Send + 'static,
{
let running = Arc::new(AtomicBool::new(true));
let mut active_threads = vec![];
let keyboard_events = os_input.keyboard_events;
let get_open_sockets = os_input.get_open_sockets;
let mut write_to_stdout = os_input.write_to_stdout;
let mut dns_client = os_input.dns_client;
let on_winch = os_input.on_winch;
let cleanup = os_input.cleanup;
let raw_mode = opts.raw;
let mut sniffer = Sniffer::new(os_input.network_interface, os_input.network_frames);
let network_utilization = Arc::new(Mutex::new(Utilization::new()));
let ui = Arc::new(Mutex::new(Ui::new(terminal_backend)));
if !raw_mode {
active_threads.push(
thread::Builder::new()
.name("resize_handler".to_string())
.spawn({
let ui = ui.clone();
move || {
on_winch({
Box::new(move || {
let mut ui = ui.lock().unwrap();
ui.draw();
})
});
}
})
.unwrap(),
);
}
let display_handler = thread::Builder::new()
.name("display_handler".to_string())
.spawn({
let running = running.clone();
let network_utilization = network_utilization.clone();
move || {
while running.load(Ordering::Acquire) {
let render_start_time = Instant::now();
let utilization = { network_utilization.lock().unwrap().clone_and_reset() };
let connections_to_procs = get_open_sockets();
let mut ip_to_host = IpTable::new();
if let Some(dns_client) = dns_client.as_mut() {
ip_to_host = dns_client.cache();
let unresolved_ips = connections_to_procs
.keys()
.filter(|conn| !ip_to_host.contains_key(&conn.remote_socket.ip))
.map(|conn| conn.remote_socket.ip)
.collect::<Vec<_>>();
dns_client.resolve(unresolved_ips);
}
{
let mut ui = ui.lock().unwrap();
ui.update_state(connections_to_procs, utilization, ip_to_host);
if raw_mode {
ui.output_text(&mut write_to_stdout);
} else {
ui.draw();
}
}
let render_duration = render_start_time.elapsed();
park_timeout(time::Duration::from_millis(1000) - render_duration);
}
if !raw_mode {
let mut ui = ui.lock().unwrap();
ui.end();
}
}
})
.unwrap();
active_threads.push(
thread::Builder::new()
.name("stdin_handler".to_string())
.spawn({
let running = running.clone();
let display_handler = display_handler.thread().clone();
move || {
for evt in keyboard_events {
match evt {
Event::Key(Key::Ctrl('c')) | Event::Key(Key::Char('q')) => {
running.store(false, Ordering::Release);
cleanup();
display_handler.unpark();
break;
}
_ => (),
};
}
}
})
.unwrap(),
);
active_threads.push(display_handler);
active_threads.push(
thread::Builder::new()
.name("sniffing_handler".to_string())
.spawn(move || {
while running.load(Ordering::Acquire) {
if let Some(segment) = sniffer.next() {
network_utilization.lock().unwrap().update(&segment)
}
}
})
.unwrap(),
);
for thread_handler in active_threads {
thread_handler.join().unwrap()
}
}
|
