diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Cargo.lock | 567 | ||||
| -rw-r--r-- | Cargo.toml | 11 | ||||
| -rw-r--r-- | src/main.rs | 76 |
4 files changed, 655 insertions, 0 deletions
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io::prelude::*, + net::{Ipv4Addr, SocketAddrV4, TcpListener, TcpStream}, + prelude::*, + task, +}; +use std::{env, sync::Arc, time::Duration}; + +static DURATION: Duration = Duration::from_secs(1); + +/// Listens for incoming TCP connections and handles them. +#[async_std::main] +async fn main() -> Result<()> { + let listener = TcpListener::bind(read_addr()?) + .await + .with_context(|| "tarpit: failed to bind TCP listener")?; + + let banner = Arc::new(read_banner().await?); + + let mut incoming = listener.incoming(); + while let Some(stream) = incoming.next().await { + match stream { + Err(e) => { + eprintln!("error\t{}", e); + continue; + } + Ok(s) => { + let banner = banner.clone(); + task::spawn(handler(s, banner)); + } + } + } + + Ok(()) +} + +/// Handles a single TCP connection, continuously writing banner to the TCP stream sloooooowly. +async fn handler(mut stream: TcpStream, banner: Arc<String>) { + let peer_addr = stream + .peer_addr() + .map(|p| p.to_string()) + .unwrap_or_else(|_| String::from("(unknown)")); + + eprintln!("connected\t{}", peer_addr); + + for word in banner.split_inclusive(char::is_whitespace).cycle() { + if stream.write_all(word.as_bytes()).await.is_err() { + eprintln!("disconnected\t{}", peer_addr); + return; + } + task::sleep(DURATION).await; + } +} + +/// Reads address port to bind to from first arguent. +fn read_addr() -> Result<SocketAddrV4> { + let port = env::args() + .nth(1) + .map(|arg| arg.parse()) + .unwrap_or(Ok(22)) + .with_context(|| "tarpit: failed to parse bind port")?; + + Ok(SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), port)) +} + +/// Reads banner to be written to client from STDIN. +async fn read_banner() -> Result<String> { + let mut banner = String::new(); + io::stdin() + .read_to_string(&mut banner) + .await + .with_context(|| "tarpit: failed to read banner")?; + Ok(banner) +} |