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vpncloud/src/net.rs

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5.4 KiB

// VpnCloud - Peer-to-Peer VPN
// Copyright (C) 2015-2021 Dennis Schwerdel
// This software is licensed under GPL-3 or newer (see LICENSE.md)
use std::{
collections::{HashMap, VecDeque},
io::{self, ErrorKind},
net::{IpAddr, Ipv6Addr, SocketAddr, UdpSocket},
os::unix::io::{AsRawFd, RawFd},
sync::atomic::{AtomicBool, Ordering},
};
use super::util::{MockTimeSource, MsgBuffer, Time, TimeSource};
use crate::{config::DEFAULT_PORT, port_forwarding::PortForwarding};
pub fn mapped_addr(addr: SocketAddr) -> SocketAddr {
// HOT PATH
match addr {
SocketAddr::V4(addr4) => SocketAddr::new(IpAddr::V6(addr4.ip().to_ipv6_mapped()), addr4.port()),
_ => addr,
}
}
pub fn get_ip() -> IpAddr {
let s = UdpSocket::bind("[::]:0").unwrap();
s.connect("8.8.8.8:0").unwrap();
s.local_addr().unwrap().ip()
}
pub trait Socket: AsRawFd + Sized {
fn listen(addr: &str) -> Result<Self, io::Error>;
fn receive(&mut self, buffer: &mut MsgBuffer) -> Result<SocketAddr, io::Error>;
fn send(&mut self, data: &[u8], addr: SocketAddr) -> Result<usize, io::Error>;
fn address(&self) -> Result<SocketAddr, io::Error>;
fn create_port_forwarding(&self) -> Option<PortForwarding>;
}
pub fn parse_listen(addr: &str, default_port: u16) -> SocketAddr {
if let Some(addr) = addr.strip_prefix("*:") {
let port = try_fail!(addr.parse::<u16>(), "Invalid port: {}");
SocketAddr::new(IpAddr::V6(Ipv6Addr::UNSPECIFIED), port)
} else if addr.contains(':') {
try_fail!(addr.parse::<SocketAddr>(), "Invalid address: {}: {}", addr)
} else if let Ok(port) = addr.parse::<u16>() {
SocketAddr::new(IpAddr::V6(Ipv6Addr::UNSPECIFIED), port)
} else {
let ip = try_fail!(addr.parse::<IpAddr>(), "Invalid addr: {}");
SocketAddr::new(ip, default_port)
}
}
impl Socket for UdpSocket {
fn listen(addr: &str) -> Result<Self, io::Error> {
let addr = mapped_addr(parse_listen(addr, DEFAULT_PORT));
UdpSocket::bind(addr)
}
fn receive(&mut self, buffer: &mut MsgBuffer) -> Result<SocketAddr, io::Error> {
buffer.clear();
let (size, addr) = self.recv_from(buffer.buffer())?;
buffer.set_length(size);
Ok(addr)
}
fn send(&mut self, data: &[u8], addr: SocketAddr) -> Result<usize, io::Error> {
self.send_to(data, addr)
}
fn address(&self) -> Result<SocketAddr, io::Error> {
let mut addr = self.local_addr()?;
addr.set_ip(get_ip());
Ok(addr)
}
fn create_port_forwarding(&self) -> Option<PortForwarding> {
PortForwarding::new(self.address().unwrap().port())
}
}
thread_local! {
static MOCK_SOCKET_NAT: AtomicBool = AtomicBool::new(false);
}
pub struct MockSocket {
nat: bool,
nat_peers: HashMap<SocketAddr, Time>,
address: SocketAddr,
outbound: VecDeque<(SocketAddr, Vec<u8>)>,
inbound: VecDeque<(SocketAddr, Vec<u8>)>,
}
impl MockSocket {
pub fn new(address: SocketAddr) -> Self {
Self {
nat: Self::get_nat(),
nat_peers: HashMap::new(),
address,
outbound: VecDeque::with_capacity(10),
inbound: VecDeque::with_capacity(10),
}
}
pub fn set_nat(nat: bool) {
MOCK_SOCKET_NAT.with(|t| t.store(nat, Ordering::SeqCst))
}
pub fn get_nat() -> bool {
MOCK_SOCKET_NAT.with(|t| t.load(Ordering::SeqCst))
}
pub fn put_inbound(&mut self, from: SocketAddr, data: Vec<u8>) -> bool {
if !self.nat {
self.inbound.push_back((from, data));
return true;
}
if let Some(timeout) = self.nat_peers.get(&from) {
if *timeout >= MockTimeSource::now() {
self.inbound.push_back((from, data));
return true;
}
}
warn!("Sender {:?} is filtered out by NAT", from);
false
}
pub fn pop_outbound(&mut self) -> Option<(SocketAddr, Vec<u8>)> {
self.outbound.pop_front()
}
}
impl AsRawFd for MockSocket {
fn as_raw_fd(&self) -> RawFd {
unimplemented!()
}
}
impl Socket for MockSocket {
fn listen(addr: &str) -> Result<Self, io::Error> {
Ok(Self::new(mapped_addr(parse_listen(addr, DEFAULT_PORT))))
}
fn receive(&mut self, buffer: &mut MsgBuffer) -> Result<SocketAddr, io::Error> {
if let Some((addr, data)) = self.inbound.pop_front() {
buffer.clear();
buffer.set_length(data.len());
buffer.message_mut().copy_from_slice(&data);
Ok(addr)
} else {
Err(io::Error::new(ErrorKind::Other, "nothing in queue"))
}
}
fn send(&mut self, data: &[u8], addr: SocketAddr) -> Result<usize, io::Error> {
self.outbound.push_back((addr, data.into()));
if self.nat {
self.nat_peers.insert(addr, MockTimeSource::now() + 300);
}
Ok(data.len())
}
fn address(&self) -> Result<SocketAddr, io::Error> {
Ok(self.address)
}
fn create_port_forwarding(&self) -> Option<PortForwarding> {
None
}
}
#[cfg(feature = "bench")]
mod bench {
use std::net::{Ipv4Addr, SocketAddrV4, UdpSocket};
use test::Bencher;
#[bench]
fn udp_send(b: &mut Bencher) {
let sock = UdpSocket::bind("127.0.0.1:0").unwrap();
let data = [0; 1400];
let addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 1);
b.iter(|| sock.send_to(&data, &addr).unwrap());
b.bytes = 1400;
}
}