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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
//! Primitives for working with UDP
//!
//! The types provided in this module are non-blocking by default and are
//! designed to be portable across all supported Mio platforms. As long as the
//! [portability guidelines] are followed, the behavior should be identical no
//! matter the target platform.
//!
/// [portability guidelines]: ../struct.Poll.html#portability

use {io, sys, Ready, Poll, PollOpt, Token};
use event::Evented;
use poll::SelectorId;
use std::net::{self, Ipv4Addr, Ipv6Addr, SocketAddr};

/// A User Datagram Protocol socket.
///
/// This is an implementation of a bound UDP socket. This supports both IPv4 and
/// IPv6 addresses, and there is no corresponding notion of a server because UDP
/// is a datagram protocol.
#[derive(Debug)]
pub struct UdpSocket {
    sys: sys::UdpSocket,
    selector_id: SelectorId,
}

impl UdpSocket {
    /// Creates a UDP socket from the given address.
    pub fn bind(addr: &SocketAddr) -> io::Result<UdpSocket> {
        let socket = net::UdpSocket::bind(addr)?;
        UdpSocket::from_socket(socket)
    }

    /// Creates a new mio-wrapped socket from an underlying and bound std
    /// socket.
    ///
    /// This function requires that `socket` has previously been bound to an
    /// address to work correctly, and returns an I/O object which can be used
    /// with mio to send/receive UDP messages.
    ///
    /// This can be used in conjunction with net2's `UdpBuilder` interface to
    /// configure a socket before it's handed off to mio, such as setting
    /// options like `reuse_address` or binding to multiple addresses.
    pub fn from_socket(socket: net::UdpSocket) -> io::Result<UdpSocket> {
        Ok(UdpSocket {
            sys: sys::UdpSocket::new(socket)?,
            selector_id: SelectorId::new(),
        })
    }

    /// Returns the socket address that this socket was created from.
    pub fn local_addr(&self) -> io::Result<SocketAddr> {
        self.sys.local_addr()
    }

    /// Creates a new independently owned handle to the underlying socket.
    ///
    /// The returned `UdpSocket` is a reference to the same socket that this
    /// object references. Both handles will read and write the same port, and
    /// options set on one socket will be propagated to the other.
    pub fn try_clone(&self) -> io::Result<UdpSocket> {
        self.sys.try_clone()
            .map(|s| {
                UdpSocket {
                    sys: s,
                    selector_id: self.selector_id.clone(),
                }
            })
    }

    /// Sends data on the socket to the given address. On success, returns the
    /// number of bytes written.
    ///
    /// Address type can be any implementor of `ToSocketAddrs` trait. See its
    /// documentation for concrete examples.
    pub fn send_to(&self, buf: &[u8], target: &SocketAddr) -> io::Result<usize> {
        self.sys.send_to(buf, target)
    }

    /// Receives data from the socket. On success, returns the number of bytes
    /// read and the address from whence the data came.
    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
        self.sys.recv_from(buf)
    }

    /// Sends data on the socket to the address previously bound via connect(). On success,
    /// returns the number of bytes written.
    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
        self.sys.send(buf)
    }

    /// Receives data from the socket previously bound with connect(). On success, returns
    /// the number of bytes read and the address from whence the data came.
    pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
        self.sys.recv(buf)
    }

    /// Connects the UDP socket setting the default destination for `send()`
    /// and limiting packets that are read via `recv` from the address specified
    /// in `addr`.
    pub fn connect(&self, addr: SocketAddr) -> io::Result<()> {
        self.sys.connect(addr)
    }

    /// Sets the value of the `SO_BROADCAST` option for this socket.
    ///
    /// When enabled, this socket is allowed to send packets to a broadcast
    /// address.
    pub fn set_broadcast(&self, on: bool) -> io::Result<()> {
        self.sys.set_broadcast(on)
    }

    /// Gets the value of the `SO_BROADCAST` option for this socket.
    ///
    /// For more information about this option, see
    /// [`set_broadcast`][link].
    ///
    /// [link]: #method.set_broadcast
    pub fn broadcast(&self) -> io::Result<bool> {
        self.sys.broadcast()
    }

    /// Sets the value of the `IP_MULTICAST_LOOP` option for this socket.
    ///
    /// If enabled, multicast packets will be looped back to the local socket.
    /// Note that this may not have any affect on IPv6 sockets.
    pub fn set_multicast_loop_v4(&self, on: bool) -> io::Result<()> {
        self.sys.set_multicast_loop_v4(on)
    }

    /// Gets the value of the `IP_MULTICAST_LOOP` option for this socket.
    ///
    /// For more information about this option, see
    /// [`set_multicast_loop_v4`][link].
    ///
    /// [link]: #method.set_multicast_loop_v4
    pub fn multicast_loop_v4(&self) -> io::Result<bool> {
        self.sys.multicast_loop_v4()
    }

    /// Sets the value of the `IP_MULTICAST_TTL` option for this socket.
    ///
    /// Indicates the time-to-live value of outgoing multicast packets for
    /// this socket. The default value is 1 which means that multicast packets
    /// don't leave the local network unless explicitly requested.
    ///
    /// Note that this may not have any affect on IPv6 sockets.
    pub fn set_multicast_ttl_v4(&self, ttl: u32) -> io::Result<()> {
        self.sys.set_multicast_ttl_v4(ttl)
    }

    /// Gets the value of the `IP_MULTICAST_TTL` option for this socket.
    ///
    /// For more information about this option, see
    /// [`set_multicast_ttl_v4`][link].
    ///
    /// [link]: #method.set_multicast_ttl_v4
    pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
        self.sys.multicast_ttl_v4()
    }

    /// Sets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
    ///
    /// Controls whether this socket sees the multicast packets it sends itself.
    /// Note that this may not have any affect on IPv4 sockets.
    pub fn set_multicast_loop_v6(&self, on: bool) -> io::Result<()> {
        self.sys.set_multicast_loop_v6(on)
    }

    /// Gets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
    ///
    /// For more information about this option, see
    /// [`set_multicast_loop_v6`][link].
    ///
    /// [link]: #method.set_multicast_loop_v6
    pub fn multicast_loop_v6(&self) -> io::Result<bool> {
        self.sys.multicast_loop_v6()
    }

    /// Sets the value for the `IP_TTL` option on this socket.
    ///
    /// This value sets the time-to-live field that is used in every packet sent
    /// from this socket.
    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
        self.sys.set_ttl(ttl)
    }

    /// Gets the value of the `IP_TTL` option for this socket.
    ///
    /// For more information about this option, see [`set_ttl`][link].
    ///
    /// [link]: #method.set_ttl
    pub fn ttl(&self) -> io::Result<u32> {
        self.sys.ttl()
    }

    /// Executes an operation of the `IP_ADD_MEMBERSHIP` type.
    ///
    /// This function specifies a new multicast group for this socket to join.
    /// The address must be a valid multicast address, and `interface` is the
    /// address of the local interface with which the system should join the
    /// multicast group. If it's equal to `INADDR_ANY` then an appropriate
    /// interface is chosen by the system.
    pub fn join_multicast_v4(&self,
                             multiaddr: &Ipv4Addr,
                             interface: &Ipv4Addr) -> io::Result<()> {
        self.sys.join_multicast_v4(multiaddr, interface)
    }

    /// Executes an operation of the `IPV6_ADD_MEMBERSHIP` type.
    ///
    /// This function specifies a new multicast group for this socket to join.
    /// The address must be a valid multicast address, and `interface` is the
    /// index of the interface to join/leave (or 0 to indicate any interface).
    pub fn join_multicast_v6(&self,
                             multiaddr: &Ipv6Addr,
                             interface: u32) -> io::Result<()> {
        self.sys.join_multicast_v6(multiaddr, interface)
    }

    /// Executes an operation of the `IP_DROP_MEMBERSHIP` type.
    ///
    /// For more information about this option, see
    /// [`join_multicast_v4`][link].
    ///
    /// [link]: #method.join_multicast_v4
    pub fn leave_multicast_v4(&self,
                              multiaddr: &Ipv4Addr,
                              interface: &Ipv4Addr) -> io::Result<()> {
        self.sys.leave_multicast_v4(multiaddr, interface)
    }

    /// Executes an operation of the `IPV6_DROP_MEMBERSHIP` type.
    ///
    /// For more information about this option, see
    /// [`join_multicast_v6`][link].
    ///
    /// [link]: #method.join_multicast_v6
    pub fn leave_multicast_v6(&self,
                              multiaddr: &Ipv6Addr,
                              interface: u32) -> io::Result<()> {
        self.sys.leave_multicast_v6(multiaddr, interface)
    }

    /// Sets the value for the `IPV6_V6ONLY` option on this socket.
    ///
    /// If this is set to `true` then the socket is restricted to sending and
    /// receiving IPv6 packets only. In this case two IPv4 and IPv6 applications
    /// can bind the same port at the same time.
    ///
    /// If this is set to `false` then the socket can be used to send and
    /// receive packets from an IPv4-mapped IPv6 address.
    pub fn set_only_v6(&self, only_v6: bool) -> io::Result<()> {
        self.sys.set_only_v6(only_v6)
    }

    /// Gets the value of the `IPV6_V6ONLY` option for this socket.
    ///
    /// For more information about this option, see [`set_only_v6`][link].
    ///
    /// [link]: #method.set_only_v6
    pub fn only_v6(&self) -> io::Result<bool> {
        self.sys.only_v6()
    }

    /// Get the value of the `SO_ERROR` option on this socket.
    ///
    /// This will retrieve the stored error in the underlying socket, clearing
    /// the field in the process. This can be useful for checking errors between
    /// calls.
    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
        self.sys.take_error()
    }
}

impl Evented for UdpSocket {
    fn register(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt) -> io::Result<()> {
        self.selector_id.associate_selector(poll)?;
        self.sys.register(poll, token, interest, opts)
    }

    fn reregister(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt) -> io::Result<()> {
        self.sys.reregister(poll, token, interest, opts)
    }

    fn deregister(&self, poll: &Poll) -> io::Result<()> {
        self.sys.deregister(poll)
    }
}

/*
 *
 * ===== UNIX ext =====
 *
 */

#[cfg(all(unix, not(target_os = "fuchsia")))]
use std::os::unix::io::{IntoRawFd, AsRawFd, FromRawFd, RawFd};

#[cfg(all(unix, not(target_os = "fuchsia")))]
impl IntoRawFd for UdpSocket {
    fn into_raw_fd(self) -> RawFd {
        self.sys.into_raw_fd()
    }
}

#[cfg(all(unix, not(target_os = "fuchsia")))]
impl AsRawFd for UdpSocket {
    fn as_raw_fd(&self) -> RawFd {
        self.sys.as_raw_fd()
    }
}

#[cfg(all(unix, not(target_os = "fuchsia")))]
impl FromRawFd for UdpSocket {
    unsafe fn from_raw_fd(fd: RawFd) -> UdpSocket {
        UdpSocket {
            sys: FromRawFd::from_raw_fd(fd),
            selector_id: SelectorId::new(),
        }
    }
}