408 lines
16 KiB
Rust
408 lines
16 KiB
Rust
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pub mod general {
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use crate::config::ClientConfiguration;
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use crossbeam_channel::{Receiver, Sender};
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use futures::{stream::SplitSink, StreamExt};
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use tokio_util::{codec::Framed, sync::CancellationToken};
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use tokio::{net::UdpSocket, sync::{Mutex, mpsc}, io::{AsyncWriteExt, AsyncReadExt}, fs::File};
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use log::{error, info, warn};
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use aes_gcm::{
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aead::{Aead, AeadCore, KeyInit, OsRng},
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Aes256Gcm, Nonce};
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use base64::prelude::*;
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use std::{io::{Read, Write}, sync::Arc};
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use std::net::Ipv4Addr;
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use x25519_dalek::{PublicKey, StaticSecret};
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use crate::udp::{UDPVpnPacket, UDPVpnHandshake, UDPSerializable};
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use tun::{ AsyncDevice, DeviceReader, DeviceWriter, TunPacketCodec };
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pub trait ReadWrapper {
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async fn read(&mut self, buf: &mut Vec<u8>) -> Result<usize, ()>;
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}
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pub struct DevReader {
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pub dr: Receiver<Vec<u8>>
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}
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// TODO: implement custom Error
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impl ReadWrapper for DevReader {
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async fn read(&mut self, buf: &mut Vec<u8>) -> Result<usize, ()> {
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if let Ok(tb) = self.dr.recv() {
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*buf = tb;
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return Ok(buf.len());
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}
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Err(())
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}
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}
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pub struct FdReader {
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pub br: File
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}
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impl ReadWrapper for FdReader {
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async fn read(&mut self, buf: &mut Vec<u8>) -> Result<usize, ()> {
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let r = self.br.read(buf).await;
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if let Ok(a) = r {
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return Ok(a);
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}
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Err(())
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}
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}
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pub trait WriteWrapper {
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async fn write(&mut self, msg: WriterMessage) -> Result<usize, ()>;
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}
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pub enum WriterMessage {
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Plain(Vec<u8>),
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Gateway(Ipv4Addr)
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}
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pub struct DevWriter {
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pub dr: Sender<Vec<u8>>
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}
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// TODO: implement custom Error
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impl WriteWrapper for DevWriter {
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async fn write(&mut self, msg: WriterMessage) -> Result<usize, ()> {
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match msg {
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WriterMessage::Plain(buf) => {
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let l = buf.len();
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if let Ok(()) = self.dr.send(buf) {
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return Ok(l);
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}
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Err(())
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},
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// this thing should be abolished later
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WriterMessage::Gateway(_addr) => {
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Ok(0)
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}
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}
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}
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}
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pub struct FdWriter {
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pub br: File
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}
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impl WriteWrapper for FdWriter {
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async fn write(&mut self, msg: WriterMessage) -> Result<usize, ()> {
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match msg {
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WriterMessage::Plain(buf) => {
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if let Ok(a) = self.br.write(&buf).await {
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return Ok(a);
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}
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Err(())
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},
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WriterMessage::Gateway(_addr) => {Ok(0)}
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}
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}
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}
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pub trait VpnClient {
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async fn start(&self);
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}
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pub struct CoreVpnClient<T, R> where T: ReadWrapper, R: WriteWrapper {
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pub client_config: ClientConfiguration,
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pub dev_reader: T,
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pub dev_writer: R,
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pub close_token: CancellationToken
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}
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impl<T: ReadWrapper + std::marker::Sync, R: WriteWrapper + std::marker::Sync> CoreVpnClient<T, R> {
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pub async fn start(&mut self, sock: UdpSocket) {
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info!("Starting client...");
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let dr_cancel: CancellationToken = CancellationToken::new();
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let sr_cancel: CancellationToken = CancellationToken::new();
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let sock_rec = Arc::new(sock);
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let sock_snd = sock_rec.clone();
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let (tx, mut rx) = mpsc::unbounded_channel::<Vec<u8>>();
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let (dx, mut mx) = mpsc::unbounded_channel::<Vec<u8>>();
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let cipher_shared: Arc<Mutex<Option<x25519_dalek::SharedSecret>>> = Arc::new(Mutex::new(None));
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let priv_key = BASE64_STANDARD.decode(&self.client_config.client.private_key).unwrap();
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let cipher_shared_clone = cipher_shared.clone();
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let pkey = BASE64_STANDARD.decode(&self.client_config.client.public_key).unwrap();
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let handshake = UDPVpnHandshake{ public_key: pkey, request_ip: self.client_config.client.address.parse::<Ipv4Addr>().unwrap() };
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let mut nz = 0;
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while nz < 25 {
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sock_snd.send(&handshake.serialize()).await.unwrap();
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nz += 1
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}
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//sock_snd.send(&handshake.serialize()).await.unwrap();
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let s_cipher = cipher_shared.clone();
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let _ = self.dev_writer.write(WriterMessage::Plain(handshake.serialize())).await;
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let mut buf = vec![0; 1400]; // mtu
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let mut buf1 = vec![0; 4096];
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loop {
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tokio::select! {
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_ = self.close_token.cancelled() => {
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info!("Cancellation token has been thrown");
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sr_cancel.cancel();
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dr_cancel.cancel();
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return;
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}
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rr = rx.recv() => {
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if let Some(bytes) = rr {
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info!("Write to tun.");
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if let Err(e) = self.dev_writer.write(WriterMessage::Plain(bytes)).await {
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error!("Writing error: {:?}", e);
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}
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/* if let Err(e) = self.dev_writer.flush().await {
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error!("Flushing error: {:?}", e);
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}*/
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}
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}
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rr2 = mx.recv() => {
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if let Some(bytes) = rr2 {
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let s_c = s_cipher.lock().await;
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if s_c.is_some() {
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let aes = Aes256Gcm::new(s_c.as_ref().unwrap().as_bytes().into());
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let nonce = Aes256Gcm::generate_nonce(&mut OsRng);
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let ciphered_data = aes.encrypt(&nonce, &bytes[..]);
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if let Ok(ciphered_d) = ciphered_data {
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let vpn_packet = UDPVpnPacket{ data: ciphered_d, nonce: nonce.to_vec()};
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let serialized_data = vpn_packet.serialize();
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info!("Write to socket");
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sock_snd.send(&serialized_data).await.unwrap();
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} else {
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error!("Socket encryption failed.");
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}
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} else {
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error!("There is no shared_secret in main loop");
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}
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}
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}
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rr = self.dev_reader.read(&mut buf) => {
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if let Ok(n) = rr {
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info!("Read from tun."); // hex::encode(&buf[..n])
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dx.send(buf[..n].to_vec()).unwrap();
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}
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}
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rr = sock_rec.recv(&mut buf1) => {
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if let Ok(l) = rr {
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info!("Read from socket");
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let mut s_cipher = cipher_shared_clone.lock().await;
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match buf1.first() {
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Some(h) => {
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match h {
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0 => {
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let handshake = UDPVpnHandshake::deserialize(&(buf1[..l].to_vec()));
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let mut k = [0u8; 32];
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for (&x, p) in handshake.public_key.iter().zip(k.iter_mut()) {
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*p = x;
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}
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let mut k1 = [0u8; 32];
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for (&x, p) in priv_key.iter().zip(k1.iter_mut()) {
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*p = x;
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}
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*s_cipher = Some(StaticSecret::from(k1)
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.diffie_hellman(&PublicKey::from(k)));
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}, // handshake
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1 => {
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let wrapped_packet = UDPVpnPacket::deserialize(&(buf1[..l].to_vec()));
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if s_cipher.is_some() {
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let aes = Aes256Gcm::new(s_cipher.as_ref().unwrap().as_bytes().into());
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let nonce = Nonce::clone_from_slice(&wrapped_packet.nonce);
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match aes.decrypt(&nonce, &wrapped_packet.data[..]) {
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Ok(decrypted) => { let _ = tx.send(decrypted); },
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Err(error) => { error!("Decryption error! {:?}", error); }
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}
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} else {
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warn!("There is no static_secret");
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}
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}, // payload
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2 => { info!("Got keepalive packet"); },
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_ => { error!("Unexpected header value."); }
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}
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},
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None => { error!("There is no header."); }
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}
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drop(s_cipher);
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}
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}
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};
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}
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}
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}
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}
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pub mod android {
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#![cfg(target_os = "android")]
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use crate::client::general::{VpnClient, CoreVpnClient, FdReader, FdWriter};
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use crate::config::ClientConfiguration;
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use tokio_util::sync::CancellationToken;
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use std::os::fd::FromRawFd;
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use tokio::{net::UdpSocket, sync::{Mutex, mpsc}, io::{BufReader, BufWriter, AsyncWriteExt, AsyncReadExt}, fs::File};
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use log::{error, info, warn};
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pub struct AndroidClient {
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pub client_config: ClientConfiguration,
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pub fd: i32,
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pub close_token: CancellationToken
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}
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impl VpnClient for AndroidClient {
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async fn start(&self) {
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info!("FD: {:?}", &self.fd);
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let mut dev = unsafe { File::from_raw_fd(self.fd) };
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let mut dev1 = unsafe { File::from_raw_fd(self.fd) };
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let mut client = CoreVpnClient{client_config: self.client_config.clone(), dev_reader: FdReader{br: dev}, dev_writer: FdWriter{br: dev1}, close_token: self.close_token.clone()};
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info!("SSS: {:?}", &self.client_config.server.endpoint);
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let sock = UdpSocket::bind("0.0.0.0:0").await.unwrap();
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sock.connect(&self.client_config.server.endpoint).await.unwrap();
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client.start(sock).await;
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}
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}
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}
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pub mod desktop {
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use crate::client::general::{CoreVpnClient, DevReader, DevWriter, VpnClient};
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use crate::config::ClientConfiguration;
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use futures::{SinkExt, StreamExt};
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use log::info;
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use tokio::net::UdpSocket;
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use crossbeam_channel::unbounded;
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#[cfg(target_os = "linux")]
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use network_interface::{NetworkInterface, NetworkInterfaceConfig};
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use tun::{ Configuration, create_as_async };
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#[cfg(target_os = "linux")]
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fn configure_routes(endpoint_ip: &str, s_interface: Option<String>) {
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let interfaces = NetworkInterface::show().unwrap();
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let net_inter = interfaces.iter()
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.filter(|i| !i.addr.iter().any(|b| b.ip().to_string() == "127.0.0.1" || b.ip().to_string() == "::1") )
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.min_by(|x, y| x.index.cmp(&y.index))
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.unwrap();
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let inter_name = if s_interface.is_some() { s_interface.unwrap() } else { net_inter.name.clone() };
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info!("Main network interface: {:?}", inter_name);
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/*let mut ip_output = std::process::Command::new("sudo")
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.arg("ip")
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.arg("route")
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.arg("del")
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.arg("default")
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.output()
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.expect("Failed to delete default gateway.");
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if !ip_output.status.success() {
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error!("Failed to delete default gateway: {:?}", String::from_utf8_lossy(&ip_output.stderr));
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}*/
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let mut ip_output = std::process::Command::new("sudo")
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.arg("ip")
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.arg("-4")
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.arg("route")
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.arg("add")
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.arg("0.0.0.0/0")
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.arg("dev")
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.arg("tun0")
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.output()
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.expect("Failed to execute ip route command.");
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if !ip_output.status.success() {
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log::error!("Failed to route all traffic: {:?}", String::from_utf8_lossy(&ip_output.stderr));
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}
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// TODO: replace 192.168.0.1 with relative variable
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ip_output = std::process::Command::new("sudo")
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.arg("ip")
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.arg("route")
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.arg("add")
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.arg(endpoint_ip.to_owned()+"/32")
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.arg("via")
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.arg("192.168.0.1")
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.arg("dev")
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.arg(inter_name)
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.output()
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.expect("Failed to make exception for vpns endpoint.");
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if !ip_output.status.success() {
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log::error!("Failed to forward packets: {:?}", String::from_utf8_lossy(&ip_output.stderr));
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}
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}
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pub struct DesktopClient {
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pub client_config: ClientConfiguration,
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pub s_interface: Option<String>
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}
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impl VpnClient for DesktopClient {
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async fn start(&self) {
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info!("s_interface: {:?}", &self.s_interface);
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let mut config = Configuration::default();
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config.address(&self.client_config.client.address)
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.netmask("255.255.255.255")
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.destination(&self.client_config.client.address)
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.mtu(1400)
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.tun_name("tun0")
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.up();
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#[cfg(target_os = "linux")]
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config.platform_config(|config| {
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config.ensure_root_privileges(true);
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});
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info!("SSS: {:?}", &self.client_config.server.endpoint);
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let sock = UdpSocket::bind(("0.0.0.0", 0)).await.unwrap();
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sock.connect(&self.client_config.server.endpoint).await.unwrap();
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let dev = create_as_async(&config).unwrap();
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let (mut dev_writer , mut dev_reader) = dev.into_framed().split();
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// dev_reader
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let (tx, rx) = unbounded();
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// dev_writer
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let (wx, wrx) = unbounded();
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tokio::spawn(async move {
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loop {
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if let Some(Ok(buf)) = dev_reader.next().await {
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tx.send(buf);
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}
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}
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});
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tokio::spawn(async move {
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loop {
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if let Ok(buf) = wrx.recv() {
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let _ = dev_writer.send(buf).await;
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}
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}
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});
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let mut client = CoreVpnClient{ client_config: self.client_config.clone(), dev_reader: DevReader{ dr: rx }, dev_writer: DevWriter{dr: wx}, close_token: tokio_util::sync::CancellationToken::new()};
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info!("Platform specific code");
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#[cfg(target_os = "linux")]
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{
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let s_a: std::net::SocketAddr = self.client_config.server.endpoint.parse().unwrap();
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configure_routes(&s_a.ip().to_string(), self.s_interface.clone());
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}
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client.start(sock).await;
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}
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}
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} |