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|
use std::{cell::UnsafeCell, error::Error, net::Ipv4Addr, rc::Rc, thread::JoinHandle};
use count::Count;
use ethertype::EtherType;
use ippacket::{IpNextHeader, Ipv4Packet};
use layer3::{Tcp, Udp};
use pnet_datalink::{Channel, Config};
use scurvy::{Argument, Scurvy};
use smol::{
LocalExecutor,
channel::{self, Receiver, Sender},
io::AsyncWriteExt,
net::TcpListener,
};
mod count;
mod ethertype;
mod ippacket;
mod layer3;
fn main() -> Result<(), Box<dyn Error>> {
let args = vec![
Argument::new(&["interface", "iface"]).arg("dev"),
Argument::new("ip").arg("addr"),
];
let scurvy = Scurvy::make(args);
let interface_name = scurvy.get("interface").unwrap();
let interface = match pnet_datalink::interfaces().iter().find(|i| i.name == interface_name) {
None => {
eprintln!("No interface found named '{interface_name}'");
return Ok(());
}
Some(i) => i.clone(),
};
let ip_want: Ipv4Addr = scurvy.get("ip").unwrap().parse()?;
let mut channel = match pnet_datalink::channel(&interface, Config::default())? {
Channel::Ethernet(_tx, rx) => rx,
_ => unimplemented!(),
};
let stat = stat_thread();
loop {
let pkt = channel.next()?;
let ethertype = EtherType::new(u16::from_be_bytes([pkt[12], pkt[13]]));
let eth_payload = &pkt[14..];
match ethertype {
EtherType::IPv4 => {
let ip = Ipv4Packet::new(eth_payload);
let ip_payload = ip.get_payload();
let ip_tx = if ip.src == ip_want {
true
} else if ip.dst == ip_want {
false
} else {
continue;
};
// 6 byte per MAC (x2), 2 byte ethertype, 2 byte crc
let total_l2_len = ip.get_packet_len() + 18;
match ip.get_next_header() {
IpNextHeader::Tcp => {
let tcp = Tcp::new(ip_payload);
stat.tx.send_blocking(Meow::Tcp {
tx: ip_tx,
src: tcp.source_port(),
dst: tcp.destination_port(),
len: total_l2_len,
})?;
}
IpNextHeader::Udp => {
let udp = Udp::new(ip_payload);
stat.tx.send_blocking(Meow::Udp {
tx: ip_tx,
src: udp.source_port(),
dst: udp.destination_port(),
len: total_l2_len,
})?;
}
_ => (),
}
}
_ => (),
}
}
}
#[allow(dead_code)]
struct StatHandle {
hwnd: JoinHandle<()>,
tx: Sender<Meow>,
}
enum Meow {
Tcp {
tx: bool,
src: u16,
dst: u16,
len: usize,
},
Udp {
tx: bool,
src: u16,
dst: u16,
len: usize,
},
}
fn stat_thread() -> StatHandle {
let (tx, rx) = channel::unbounded();
let hwnd = std::thread::spawn(|| stat(rx));
StatHandle { hwnd, tx }
}
fn stat(rx: Receiver<Meow>) {
let cat = Rc::new(UnsafeCell::new(Count::new()));
let ex = Rc::new(LocalExecutor::new());
ex.spawn(async {
loop {
match rx.recv().await {
Err(_e) => {
eprintln!("error receiving! breaking from loop");
break;
}
Ok(Meow::Tcp { tx, src, dst, len }) => {
unsafe { &mut *cat.get() }.push_tcp(tx, src, dst, len);
}
Ok(Meow::Udp { tx, src, dst, len }) => {
unsafe { &mut *cat.get() }.push_udp(tx, src, dst, len);
}
}
}
})
.detach();
let run_cat = Rc::clone(&cat);
let run_ex = Rc::clone(&ex);
let run = ex.run(async move {
let socket = TcpListener::bind("127.0.0.1:6666").await.unwrap();
loop {
let (mut stream, _caddr) = socket.accept().await.unwrap();
let per_spawn_cat = Rc::clone(&run_cat);
run_ex
.spawn(async move {
let cat = unsafe { &mut *per_spawn_cat.get() };
let http_tx = cat.many_tcp_tx(&[80, 443]);
let http_rx = cat.many_tcp_rx(&[80, 443]);
let str = format!("{http_tx}\n{http_rx}");
stream.write_all(str.as_bytes()).await.unwrap();
})
.detach();
}
});
smol::block_on(run);
}
|
