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use ::pnet_bandwhich_fork::datalink::Channel::Ethernet;
use ::pnet_bandwhich_fork::datalink::DataLinkReceiver;
use ::pnet_bandwhich_fork::datalink::{self, Config, NetworkInterface};
use ::std::io::{self, stdin, Write};
use ::termion::event::Event;
use ::termion::input::TermRead;
use ::tokio::runtime::Runtime;
use ::std::io::ErrorKind;
use ::std::time;
use signal_hook::iterator::Signals;
#[cfg(target_os = "linux")]
use crate::os::linux::get_open_sockets;
#[cfg(any(target_os = "macos", target_os = "freebsd"))]
use crate::os::lsof::get_open_sockets;
use crate::{network::dns, OsInputOutput};
pub type OnSigWinch = dyn Fn(Box<dyn Fn()>) + Send;
pub type SigCleanup = dyn Fn() + Send;
pub struct KeyboardEvents;
impl Iterator for KeyboardEvents {
type Item = Event;
fn next(&mut self) -> Option<Event> {
match stdin().events().next() {
Some(Ok(ev)) => Some(ev),
_ => None,
}
}
}
fn get_datalink_channel(
interface: &NetworkInterface,
) -> Result<Box<dyn DataLinkReceiver>, std::io::Error> {
let mut config = Config::default();
config.read_timeout = Some(time::Duration::new(1, 0));
match datalink::channel(interface, config) {
Ok(Ethernet(_tx, rx)) => Ok(rx),
Ok(_) => Err(std::io::Error::new(
ErrorKind::Other,
"Unsupported interface type",
)),
Err(e) => Err(e),
}
}
fn get_interface(interface_name: &str) -> Option<NetworkInterface> {
datalink::interfaces()
.into_iter()
.find(|iface| iface.name == interface_name)
}
fn sigwinch() -> (Box<OnSigWinch>, Box<SigCleanup>) {
let signals = Signals::new(&[signal_hook::SIGWINCH]).unwrap();
let on_winch = {
let signals = signals.clone();
move |cb: Box<dyn Fn()>| {
for signal in signals.forever() {
match signal {
signal_hook::SIGWINCH => cb(),
_ => unreachable!(),
}
}
}
};
let cleanup = move || {
signals.close();
};
(Box::new(on_winch), Box::new(cleanup))
}
fn create_write_to_stdout() -> Box<dyn FnMut(String) + Send> {
Box::new({
let mut stdout = io::stdout();
move |output: String| {
writeln!(stdout, "{}", output).unwrap();
}
})
}
pub fn get_input(
interface_name: &Option<String>,
resolve: bool,
) -> Result<OsInputOutput, failure::Error> {
let network_interfaces = if let Some(name) = interface_name {
match get_interface(&name) {
Some(interface) => vec![interface],
None => {
failure::bail!("Cannot find interface {}", name);
// the homebrew formula relies on this wording, please be careful when changing
}
}
} else {
datalink::interfaces()
};
let network_frames = network_interfaces
.iter()
.filter(|iface| iface.is_up() && !iface.ips.is_empty())
.map(|iface| (iface, get_datalink_channel(iface)));
let (available_network_frames, network_interfaces) = {
let network_frames = network_frames.clone();
let mut available_network_frames = Vec::new();
let mut available_interfaces: Vec<NetworkInterface> = Vec::new();
for (iface, rx) in network_frames.filter_map(|(iface, channel)| {
if let Ok(rx) = channel {
Some((iface, rx))
} else {
None
}
}) {
available_interfaces.push(iface.clone());
available_network_frames.push(rx);
}
(available_network_frames, available_interfaces)
};
if available_network_frames.is_empty() {
for (_, iface) in network_frames {
if let Some(iface_error) = iface.err() {
if let ErrorKind::PermissionDenied = iface_error.kind() {
failure::bail!(eperm_message())
}
}
}
failure::bail!("Failed to find any network interface to listen on.");
}
let keyboard_events = Box::new(KeyboardEvents);
let write_to_stdout = create_write_to_stdout();
let (on_winch, cleanup) = sigwinch();
let dns_client = if resolve {
let mut runtime = Runtime::new()?;
let resolver = match runtime.block_on(dns::Resolver::new(runtime.handle().clone())) {
Ok(resolver) => resolver,
Err(_) => failure::bail!("Could not initialize the DNS resolver. Are you offline?"),
};
let dns_client = dns::Client::new(resolver, runtime)?;
Some(dns_client)
} else {
None
};
Ok(OsInputOutput {
network_interfaces,
network_frames: available_network_frames,
get_open_sockets,
keyboard_events,
dns_client,
on_winch,
cleanup,
write_to_stdout,
})
}
#[inline]
#[cfg(any(target_os = "macos", target_os = "freebsd"))]
fn eperm_message() -> &'static str {
"Insufficient permissions to listen on network interface(s). Try running with sudo."
}
#[inline]
#[cfg(target_os = "linux")]
fn eperm_message() -> &'static str {
r#"
Insufficient permissions to listen on network interface(s). You can work around
this issue like this:
* Try running `bandwhich` with `sudo`
* Build a `setcap(8)` wrapper for `bandwhich` with the following rules:
`cap_net_raw,cap_net_admin+ep`
"#
}
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