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use futures::channel::mpsc; use futures::future::Future; use futures::sink::SinkExt; use futures::stream::StreamExt; pub use netsim_embed_core::Ipv4Range; use netsim_embed_core::*; use netsim_embed_machine::*; use netsim_embed_nat::*; use netsim_embed_router::*; pub use pnet_packet::*; use std::net::Ipv4Addr; pub fn run<F>(f: F) where F: Future<Output = ()> + Send + 'static, { env_logger::init(); namespace::unshare_user().unwrap(); smol::block_on(f); } #[derive(Debug)] pub struct Machine<C, E> { addr: Ipv4Addr, tx: mpsc::Sender<C>, rx: mpsc::Receiver<E>, } impl<C: Send + 'static, E: Send + 'static> Machine<C, E> { pub fn addr(&self) -> Ipv4Addr { self.addr } pub async fn send(&mut self, cmd: C) { self.tx.send(cmd).await.unwrap(); } pub async fn recv(&mut self) -> Option<E> { self.rx.next().await } } #[derive(Debug)] pub struct Network<C, E> { range: Ipv4Range, machines: Vec<Machine<C, E>>, networks: Vec<Network<C, E>>, } impl<C: Send + 'static, E: Send + 'static> Network<C, E> { pub fn range(&self) -> Ipv4Range { self.range } pub fn subnet(&mut self, i: usize) -> &mut Network<C, E> { self.networks.get_mut(i).unwrap() } pub fn machine(&mut self, i: usize) -> &mut Machine<C, E> { self.machines.get_mut(i).unwrap() } } #[derive(Clone, Copy, Debug)] pub struct NatConfig { pub hair_pinning: bool, pub symmetric: bool, pub blacklist_unrecognized_addrs: bool, pub restrict_endpoints: bool, } impl Default for NatConfig { fn default() -> Self { Self { hair_pinning: false, symmetric: false, blacklist_unrecognized_addrs: false, restrict_endpoints: false, } } } #[derive(Debug)] pub struct NetworkBuilder<C, E> { range: Ipv4Range, router: Ipv4Router, machines: Vec<Machine<C, E>>, networks: Vec<Network<C, E>>, } impl<C: Send + 'static, E: Send + 'static> NetworkBuilder<C, E> { pub fn new(range: Ipv4Range) -> Self { let router = Ipv4Router::new(range.gateway_addr()); Self { range, router, machines: Default::default(), networks: Default::default(), } } pub fn spawn_machine<B, F>(&mut self, builder: B) -> Ipv4Addr where B: FnOnce(mpsc::Receiver<C>, mpsc::Sender<E>) -> F + Send + 'static, F: Future<Output = ()> + Send + 'static, { let (iface_a, iface_b) = wire(); let (cmd_tx, cmd_rx) = mpsc::channel(0); let (event_tx, event_rx) = mpsc::channel(0); let addr = self.range.random_client_addr(); let mask = self.range.netmask_prefix_length(); smol::spawn(smol::unblock(move || { let join = machine(addr, mask, iface_b, builder(cmd_rx, event_tx)); join.join().unwrap(); })) .detach(); let machine = Machine { addr, tx: cmd_tx, rx: event_rx, }; self.machines.push(machine); self.router.add_connection(iface_a, vec![addr.into()]); addr } pub fn spawn_network(&mut self, config: Option<NatConfig>, mut builder: NetworkBuilder<C, E>) { let (net_a, net_b) = wire(); if let Some(config) = config { builder .router .add_connection(net_b, vec![Ipv4Range::global().into()]); let (nat_a, nat_b) = wire(); let nat_addr = self.range.random_client_addr(); let mut nat = Ipv4Nat::new(nat_b, net_a, nat_addr, builder.range); nat.set_hair_pinning(config.hair_pinning); nat.set_symmetric(config.symmetric); nat.set_blacklist_unrecognized_addrs(config.blacklist_unrecognized_addrs); nat.set_restrict_endpoints(config.restrict_endpoints); smol::spawn(nat).detach(); self.router.add_connection(nat_a, vec![nat_addr.into()]); } else { builder .router .add_connection(net_b, vec![Ipv4Range::global().into()]); self.router .add_connection(net_a, vec![builder.range.into()]); } let network = builder.spawn(); self.networks.push(network); } pub fn spawn(self) -> Network<C, E> { let Self { range, router, machines, networks, } = self; smol::spawn(router).detach(); Network { range, machines, networks, } } }