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use std::io;
use std::io::{Read, Write};
use std::net::{TcpStream, TcpListener};
use std::time::{Instant, Duration};
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, Ordering};
use std::net;
use maidsafe_utilities::serialisation::serialise;
use maidsafe_utilities::thread::RaiiThreadJoiner;
use w_result::{WResult, WOk, WErr};
use socket_addr::SocketAddr;
use listener_message;
use socket_utils;
use mapping_context::MappingContext;
use mapped_tcp_socket::{MappedTcpSocket, MappedTcpSocketNewError, MappedTcpSocketMapWarning};
const TCP_RW_TIMEOUT: u64 = 20;
pub struct SimpleTcpHolePunchServer<T: AsRef<MappingContext>> {
_mapping_context: T,
stop_flag: Arc<AtomicBool>,
local_addr: net::SocketAddr,
_raii_joiner: RaiiThreadJoiner,
known_endpoints: Vec<SocketAddr>,
}
quick_error! {
#[derive(Debug)]
pub enum SimpleTcpHolePunchServerNewError {
CreateMappedSocket {
err: MappedTcpSocketNewError } {
description("Error creating a mapped tcp socket to listen on.")
display("Error creating a mapped tcp socket to listen on: {}", err)
cause(err)
}
Listen { err: io::Error } {
description("Error listening on socket.")
display("Error listening on socket: {}", err)
cause(err)
}
SocketLocalAddr { err: io::Error} {
description("Error getting local address of listening socket.")
display("Error getting local address of listening socket: {}", err)
cause(err)
}
}
}
impl From<SimpleTcpHolePunchServerNewError> for io::Error {
fn from(e: SimpleTcpHolePunchServerNewError) -> io::Error {
let err_str = format!("{}", e);
let kind = match e {
SimpleTcpHolePunchServerNewError::CreateMappedSocket { err } => {
let err: io::Error = From::from(err);
err.kind()
},
SimpleTcpHolePunchServerNewError::Listen { err } => err.kind(),
SimpleTcpHolePunchServerNewError::SocketLocalAddr { err } => err.kind(),
};
io::Error::new(kind, err_str)
}
}
impl<T: AsRef<MappingContext>> SimpleTcpHolePunchServer<T> {
pub fn new(mapping_context: T, deadline: Instant)
-> WResult<SimpleTcpHolePunchServer<T>,
MappedTcpSocketMapWarning,
SimpleTcpHolePunchServerNewError>
{
let (mapped_socket, warnings) = match MappedTcpSocket::new(mapping_context.as_ref(), deadline) {
WOk(mapped_socket, warnings) => (mapped_socket, warnings),
WErr(e) => {
return WErr(SimpleTcpHolePunchServerNewError::CreateMappedSocket { err: e });
}
};
let tcp_socket = mapped_socket.socket;
let stop_flag = Arc::new(AtomicBool::new(false));
let cloned_stop_flag = stop_flag.clone();
let tcp_listener = match tcp_socket.listen(128) {
Ok(tcp_listener) => tcp_listener,
Err(e) => return WErr(SimpleTcpHolePunchServerNewError::Listen { err: e }),
};
let mut local_addr = None;
let unrestricted_endpoints = mapped_socket.endpoints.into_iter().filter_map(|msa| {
let addr = msa.addr;
if socket_utils::is_loopback(&addr.ip()) {
local_addr = Some(addr);
return None;
};
match msa.nat_restricted {
false => Some(addr),
true => None,
}
}).collect();
let local_addr = match local_addr {
Some(local_addr) => *local_addr,
None => {
match tcp_listener.local_addr() {
Ok(local_addr) => local_addr,
Err(e) => return WErr(SimpleTcpHolePunchServerNewError::SocketLocalAddr { err: e }),
}
},
};
let raii_joiner = RaiiThreadJoiner::new(thread!("SimpleTcpHolePunchServer", move || {
Self::run(tcp_listener, cloned_stop_flag);
}));
WOk(SimpleTcpHolePunchServer {
_mapping_context: mapping_context,
stop_flag: stop_flag,
_raii_joiner: raii_joiner,
local_addr: local_addr,
known_endpoints: unrestricted_endpoints,
}, warnings)
}
fn run(tcp_listener: TcpListener,
stop_flag: Arc<AtomicBool>) {
while !stop_flag.load(Ordering::SeqCst) {
if let Ok((mut stream, peer_addr)) = tcp_listener.accept() {
let _ = thread!("SimpleTcpHolePunchServer::run", move || {
match stream.set_write_timeout(Some(Duration::from_secs(TCP_RW_TIMEOUT))) {
Ok(()) => (),
Err(_) => return,
};
match stream.set_read_timeout(Some(Duration::from_secs(TCP_RW_TIMEOUT))) {
Ok(()) => (),
Err(_) => return,
};
let mut read_buf = [0; 1024];
let bytes_read = match stream.read(&mut read_buf) {
Ok(n) => n,
Err(_) => return,
};
if read_buf[..bytes_read] != listener_message::REQUEST_MAGIC_CONSTANT {
return;
}
let resp = listener_message::EchoExternalAddr {
external_addr: SocketAddr(peer_addr),
};
let _ = stream.write(&unwrap_result!(serialise(&resp)));
});
}
}
}
pub fn addresses(&self) -> Vec<SocketAddr> {
self.known_endpoints.clone()
}
}
impl<T: AsRef<MappingContext>> Drop for SimpleTcpHolePunchServer<T> {
fn drop(&mut self) {
self.stop_flag.store(true, Ordering::SeqCst);
let _ = TcpStream::connect(self.local_addr);
}
}