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|
use std::{
error::Error,
net::{Ipv4Addr, Shutdown},
sync::mpsc::{self, Receiver, Sender, channel},
thread::JoinHandle,
time::{Duration, Instant},
};
use ethertype::EtherType;
use ippacket::{IpNextHeader, Ipv4Packet};
use layer3::{Tcp, Udp};
use pnet_datalink::{Channel, Config};
use scurvy::{Argument, Scurvy};
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();
let tx_clone = stat.tx.clone();
std::thread::spawn(move || {
std::thread::sleep(Duration::from_secs(30));
tx_clone.send(Meow::Show).unwrap();
});
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();
// 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);
let tcp_tx = if ip.src == ip_want {
true
} else if ip.dst == ip_want {
false
} else {
continue;
};
stat.tx.send(Meow::Tcp {
tx: tcp_tx,
src: tcp.source_port(),
dst: tcp.destination_port(),
len: total_l2_len,
})?;
}
IpNextHeader::Udp => {
let udp = Udp::new(ip_payload);
let udp_tx = if ip.src == ip_want {
true
} else if ip.dst == ip_want {
false
} else {
continue;
};
stat.tx.send(Meow::Udp {
tx: udp_tx,
src: udp.source_port(),
dst: udp.destination_port(),
len: total_l2_len,
})?;
}
_ => (),
}
}
_ => (),
}
}
}
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,
},
Show,
Shutdown,
}
fn stat_thread() -> StatHandle {
let (tx, rx) = channel();
let hwnd = std::thread::spawn(|| stat(rx));
StatHandle { hwnd, tx }
}
fn stat(rx: Receiver<Meow>) {
let mut tcp_tx = vec![0; u16::MAX as usize];
let mut tcp_rx = vec![0; u16::MAX as usize];
let mut last_print = Instant::now();
loop {
if last_print.elapsed() > Duration::from_secs(10) {
let http_s = tcp_rx[80] + tcp_rx[443];
let http_s_kb = http_s / 1000;
let http_s_tx = tcp_tx[80] + tcp_tx[443];
let http_s_tx_kb = http_s_tx / 1000;
println!("HTTP(S) rx {}kB // tx {}kB", http_s_kb, http_s_tx_kb);
last_print = Instant::now();
}
match rx.recv() {
Err(_e) => {
eprintln!("error receiving! breaking from loop");
break;
}
Ok(Meow::Show) => {
if last_print.elapsed() > Duration::from_secs(30) {
println!("Activated by Meow::Show");
}
}
Ok(Meow::Shutdown) => {
eprintln!("got shutdown! breaking from loop");
break;
}
Ok(Meow::Tcp {
tx: tcp_tx_flag,
src,
dst,
len,
}) => {
if tcp_tx_flag {
tcp_tx[src as usize] += len;
} else {
tcp_rx[dst as usize] += len;
}
}
_ => (),
}
}
}
|
