1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
use std::io;
use std::net::{SocketAddr, Ipv4Addr, SocketAddrV4, IpAddr};
use std::os::unix::io::{AsRawFd, RawFd};
use failure::Error;
use futures::{Async, Future, Poll, Stream, Sink, StartSend, AsyncSink, future, stream, unsync::mpsc};
use nix::sys::socket::{sockopt, setsockopt};
use udp::UdpSocket;
use tokio_core::reactor::Handle;
use std::net::Ipv6Addr;
/// A unified `Stream` and `Sink` interface to an underlying `UdpSocket`, using
/// the `UdpCodec` trait to encode and decode frames.
///
/// You can acquire a `UdpFramed` instance by using the `UdpSocket::framed`
/// adapter.
#[must_use = "sinks do nothing unless polled"]
pub struct UdpFramed {
socket: UdpSocket,
codec: VecUdpCodec,
rd: Vec<u8>,
wr: Vec<u8>,
out_addr: SocketAddr,
flushed: bool,
}
impl Stream for UdpFramed {
type Item = PeerServerMessage;
type Error = io::Error;
fn poll(&mut self) -> Poll<Option<PeerServerMessage>, io::Error> {
let (n, addr) = try_nb!(self.socket.recv_from(&mut self.rd));
trace!("received {} bytes, decoding", n);
let frame = self.codec.decode(&addr, &self.rd[..n])?;
trace!("frame decoded from buffer");
Ok(Async::Ready(Some(frame)))
}
}
impl Sink for UdpFramed {
type SinkItem = PeerServerMessage;
type SinkError = io::Error;
fn start_send(&mut self, item: PeerServerMessage) -> StartSend<PeerServerMessage, io::Error> {
trace!("sending frame");
if !self.flushed {
match self.poll_complete()? {
Async::Ready(()) => {},
Async::NotReady => return Ok(AsyncSink::NotReady(item)),
}
}
self.out_addr = self.codec.encode(item, &mut self.wr);
self.flushed = false;
trace!("frame encoded; length={}", self.wr.len());
Ok(AsyncSink::Ready)
}
fn poll_complete(&mut self) -> Poll<(), io::Error> {
if self.flushed {
return Ok(Async::Ready(()))
}
trace!("flushing frame; length={}", self.wr.len());
let n = try_nb!(self.socket.send_to(&self.wr, &self.out_addr));
trace!("written {}", n);
let wrote_all = n == self.wr.len();
self.wr.clear();
self.flushed = true;
if wrote_all {
Ok(Async::Ready(()))
} else {
Err(io::Error::new(io::ErrorKind::Other,
"failed to write entire datagram to socket"))
}
}
fn close(&mut self) -> Poll<(), io::Error> {
try_ready!(self.poll_complete());
Ok(().into())
}
}
pub fn new(socket: UdpSocket) -> UdpFramed {
UdpFramed {
socket,
codec: VecUdpCodec {},
out_addr: SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), 0)),
rd: vec![0; 64 * 1024],
wr: Vec::with_capacity(8 * 1024),
flushed: true,
}
}
impl UdpFramed {
/// Returns a reference to the underlying I/O stream wrapped by `Framed`.
///
/// Note that care should be taken to not tamper with the underlying stream
/// of data coming in as it may corrupt the stream of frames otherwise being
/// worked with.
pub fn get_ref(&self) -> &UdpSocket {
&self.socket
}
/// Returns a mutable reference to the underlying I/O stream wrapped by
/// `Framed`.
///
/// Note that care should be taken to not tamper with the underlying stream
/// of data coming in as it may corrupt the stream of frames otherwise being
/// worked with.
pub fn get_mut(&mut self) -> &mut UdpSocket {
&mut self.socket
}
/// Consumes the `Framed`, returning its underlying I/O stream.
///
/// Note that care should be taken to not tamper with the underlying stream
/// of data coming in as it may corrupt the stream of frames otherwise being
/// worked with.
pub fn into_inner(self) -> UdpSocket {
self.socket
}
}
fn v6_mapped_to_v4(addr: Ipv6Addr) -> Option<Ipv4Addr> {
match addr.segments() {
[0, 0, 0, 0, 0, f, g, h] if f == 0xffff => {
Some(Ipv4Addr::new((g >> 8) as u8, g as u8,
(h >> 8) as u8, h as u8))
},
_ => None
}
}
pub type PeerServerMessage = (SocketAddr, Vec<u8>);
pub struct VecUdpCodec;
impl VecUdpCodec {
fn decode(&mut self, src: &SocketAddr, buf: &[u8]) -> io::Result<PeerServerMessage> {
let unmapped_ip = match src.ip() {
IpAddr::V6(v6addr) => {
if let Some(v4addr) = v6_mapped_to_v4(v6addr) {
IpAddr::V4(v4addr)
} else {
IpAddr::V6(v6addr)
}
}
v4addr => v4addr
};
Ok((SocketAddr::new(unmapped_ip, src.port()), buf.to_vec()))
}
fn encode(&mut self, msg: PeerServerMessage, buf: &mut Vec<u8>) -> SocketAddr {
let (mut addr, mut data) = msg;
buf.append(&mut data);
let mapped_ip = match addr.ip() {
IpAddr::V4(v4addr) => IpAddr::V6(v4addr.to_ipv6_mapped()),
v6addr => v6addr
};
addr.set_ip(mapped_ip);
addr
}
}
pub struct UdpChannel {
pub ingress : stream::SplitStream<UdpFramed>,
pub egress : mpsc::Sender<PeerServerMessage>,
pub fd : RawFd,
handle : Handle,
}
impl From<UdpFramed> for UdpChannel {
fn from(framed: UdpFramed) -> Self {
let fd = framed.socket.as_raw_fd();
let handle = framed.socket.handle.clone();
let (udp_sink, ingress) = framed.split();
let (egress, egress_rx) = mpsc::channel(1024);
let udp_writethrough = udp_sink
.sink_map_err(|_| ())
.send_all(egress_rx.and_then(|(addr, packet)| {
trace!("sending UDP packet to {:?}", &addr);
future::ok((addr, packet))
})
.map_err(|_| { info!("udp sink error"); () }))
.then(|_| Ok(()));
handle.spawn(udp_writethrough);
UdpChannel { egress, ingress, fd, handle }
}
}
impl UdpChannel {
pub fn send(&self, message: PeerServerMessage) {
self.handle.spawn(self.egress.clone().send(message).then(|_| Ok(())));
}
#[cfg(target_os = "linux")]
pub fn set_mark(&self, mark: u32) -> Result<(), Error> {
Ok(setsockopt(self.fd, sockopt::Mark, &mark)?)
}
#[cfg(not(target_os = "linux"))]
pub fn set_mark(&self, _mark: u32) -> Result<(), Error> {
Ok(())
}
}
|
