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use ::pnet::datalink::Channel::Ethernet;
use ::pnet::datalink::DataLinkReceiver;
use ::pnet::datalink::{self, Config, NetworkInterface};
use ::std::io::{self, stdin, Write};
use ::termion::event::Event;
use ::termion::input::TermRead;
use ::std::collections::HashMap;
use ::std::net::IpAddr;
use ::std::time;
use ::procfs::FDTarget;
use signal_hook::iterator::Signals;
use crate::network::{Connection, Protocol};
use crate::OsInputOutput;
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>, failure::Error> {
let mut config = Config::default();
config.read_timeout = Some(time::Duration::new(0, 1));
match datalink::channel(interface, config) {
Ok(Ethernet(_tx, rx)) => Ok(rx),
Ok(_) => failure::bail!("Unknown interface type"),
Err(e) => failure::bail!("Failed to listen to network interface: {}", e),
}
}
fn get_interface(interface_name: &str) -> Option<NetworkInterface> {
datalink::interfaces()
.into_iter()
.find(|iface| iface.name == interface_name)
}
fn get_open_sockets() -> HashMap<Connection, String> {
let mut open_sockets = HashMap::new();
let all_procs = procfs::all_processes();
let mut inode_to_procname = HashMap::new();
for process in all_procs {
if let Ok(fds) = process.fd() {
let procname = process.stat.comm;
for fd in fds {
if let FDTarget::Socket(inode) = fd.target {
inode_to_procname.insert(inode, procname.clone());
}
}
}
}
let tcp = ::procfs::tcp().unwrap();
for entry in tcp.into_iter() {
let local_port = entry.local_address.port();
if let (Some(connection), Some(procname)) = (
Connection::new(entry.remote_address, local_port, Protocol::Tcp),
inode_to_procname.get(&entry.inode),
) {
open_sockets.insert(connection, procname.clone());
};
}
let udp = ::procfs::udp().unwrap();
for entry in udp.into_iter() {
let local_port = entry.local_address.port();
if let (Some(connection), Some(procname)) = (
Connection::new(entry.remote_address, local_port, Protocol::Udp),
inode_to_procname.get(&entry.inode),
) {
open_sockets.insert(connection, procname.clone());
};
}
open_sockets
}
fn lookup_addr(ip: &IpAddr) -> Option<String> {
::dns_lookup::lookup_addr(ip).ok()
}
fn sigwinch() -> (Box<dyn Fn(Box<dyn Fn()>) + Send>, Box<dyn Fn() + Send>) {
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))
}
pub 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: &str) -> Result<OsInputOutput, failure::Error> {
let keyboard_events = Box::new(KeyboardEvents);
let network_interface = match get_interface(interface_name) {
Some(interface) => interface,
None => {
failure::bail!("Cannot find interface {}", interface_name);
}
};
let network_frames = get_datalink_channel(&network_interface)?;
let lookup_addr = Box::new(lookup_addr);
let write_to_stdout = create_write_to_stdout();
let (on_winch, cleanup) = sigwinch();
Ok(OsInputOutput {
network_interface,
network_frames,
get_open_sockets,
keyboard_events,
lookup_addr,
on_winch,
cleanup,
write_to_stdout,
})
}
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