src/libstd/sys_common/net.rs

   1 // Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use cmp;
  12 use ffi::CString;
  13 use fmt;
  14 use io::{self, Error, ErrorKind};
  15 use libc::{c_int, c_void};
  16 use mem;
  17 use net::{SocketAddr, Shutdown, Ipv4Addr, Ipv6Addr};
  18 use ptr;
  19 use sys::net::{cvt, cvt_r, cvt_gai, Socket, init, wrlen_t};
  20 use sys::net::netc as c;
  21 use sys_common::{AsInner, FromInner, IntoInner};
  22 use time::Duration;
  23
  24 #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
  25           target_os = "ios", target_os = "macos",
  26           target_os = "openbsd", target_os = "netbsd",
  27           target_os = "solaris", target_os = "haiku"))]
  28 use sys::net::netc::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
  29 #[cfg(not(any(target_os = "dragonfly", target_os = "freebsd",
  30               target_os = "ios", target_os = "macos",
  31               target_os = "openbsd", target_os = "netbsd",
  32               target_os = "solaris", target_os = "haiku")))]
  33 use sys::net::netc::IPV6_ADD_MEMBERSHIP;
  34 #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
  35           target_os = "ios", target_os = "macos",
  36           target_os = "openbsd", target_os = "netbsd",
  37           target_os = "solaris", target_os = "haiku"))]
  38 use sys::net::netc::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
  39 #[cfg(not(any(target_os = "dragonfly", target_os = "freebsd",
  40               target_os = "ios", target_os = "macos",
  41               target_os = "openbsd", target_os = "netbsd",
  42               target_os = "solaris", target_os = "haiku")))]
  43 use sys::net::netc::IPV6_DROP_MEMBERSHIP;
  44
  45 #[cfg(any(target_os = "linux", target_os = "android",
  46           target_os = "dragonfly", target_os = "freebsd",
  47           target_os = "openbsd", target_os = "netbsd",
  48           target_os = "haiku", target_os = "bitrig"))]
  49 use libc::MSG_NOSIGNAL;
  50 #[cfg(not(any(target_os = "linux", target_os = "android",
  51               target_os = "dragonfly", target_os = "freebsd",
  52               target_os = "openbsd", target_os = "netbsd",
  53               target_os = "haiku", target_os = "bitrig")))]
  54 const MSG_NOSIGNAL: c_int = 0x0;
  55
  56 ////////////////////////////////////////////////////////////////////////////////
  57 // sockaddr and misc bindings
  58 ////////////////////////////////////////////////////////////////////////////////
  59
  60 pub fn setsockopt<T>(sock: &Socket, opt: c_int, val: c_int,
  61                      payload: T) -> io::Result<()> {
  62     unsafe {
  63         let payload = &payload as *const T as *const c_void;
  64         cvt(c::setsockopt(*sock.as_inner(), opt, val, payload,
  65                           mem::size_of::<T>() as c::socklen_t))?;
  66         Ok(())
  67     }
  68 }
  69
  70 pub fn getsockopt<T: Copy>(sock: &Socket, opt: c_int,
  71                        val: c_int) -> io::Result<T> {
  72     unsafe {
  73         let mut slot: T = mem::zeroed();
  74         let mut len = mem::size_of::<T>() as c::socklen_t;
  75         cvt(c::getsockopt(*sock.as_inner(), opt, val,
  76                           &mut slot as *mut _ as *mut _,
  77                           &mut len))?;
  78         assert_eq!(len as usize, mem::size_of::<T>());
  79         Ok(slot)
  80     }
  81 }
  82
  83 fn sockname<F>(f: F) -> io::Result<SocketAddr>
  84     where F: FnOnce(*mut c::sockaddr, *mut c::socklen_t) -> c_int
  85 {
  86     unsafe {
  87         let mut storage: c::sockaddr_storage = mem::zeroed();
  88         let mut len = mem::size_of_val(&storage) as c::socklen_t;
  89         cvt(f(&mut storage as *mut _ as *mut _, &mut len))?;
  90         sockaddr_to_addr(&storage, len as usize)
  91     }
  92 }
  93
  94 pub fn sockaddr_to_addr(storage: &c::sockaddr_storage,
  95                     len: usize) -> io::Result<SocketAddr> {
  96     match storage.ss_family as c_int {
  97         c::AF_INET => {
  98             assert!(len as usize >= mem::size_of::<c::sockaddr_in>());
  99             Ok(SocketAddr::V4(FromInner::from_inner(unsafe {
 100                 *(storage as *const _ as *const c::sockaddr_in)
 101             })))
 102         }
 103         c::AF_INET6 => {
 104             assert!(len as usize >= mem::size_of::<c::sockaddr_in6>());
 105             Ok(SocketAddr::V6(FromInner::from_inner(unsafe {
 106                 *(storage as *const _ as *const c::sockaddr_in6)
 107             })))
 108         }
 109         _ => {
 110             Err(Error::new(ErrorKind::InvalidInput, "invalid argument"))
 111         }
 112     }
 113 }
 114
 115 #[cfg(target_os = "android")]
 116 fn to_ipv6mr_interface(value: u32) -> c_int {
 117     value as c_int
 118 }
 119
 120 #[cfg(not(target_os = "android"))]
 121 fn to_ipv6mr_interface(value: u32) -> ::libc::c_uint {
 122     value as ::libc::c_uint
 123 }
 124
 125 ////////////////////////////////////////////////////////////////////////////////
 126 // get_host_addresses
 127 ////////////////////////////////////////////////////////////////////////////////
 128
 129 pub struct LookupHost {
 130     original: *mut c::addrinfo,
 131     cur: *mut c::addrinfo,
 132 }
 133
 134 impl Iterator for LookupHost {
 135     type Item = SocketAddr;
 136     fn next(&mut self) -> Option<SocketAddr> {
 137         loop {
 138             unsafe {
 139                 let cur = match self.cur.as_ref() {
 140                     None => return None,
 141                     Some(c) => c,
 142                 };
 143                 self.cur = cur.ai_next;
 144                 match sockaddr_to_addr(mem::transmute(cur.ai_addr),
 145                                        cur.ai_addrlen as usize)
 146                 {
 147                     Ok(addr) => return Some(addr),
 148                     Err(_) => continue,
 149                 }
 150             }
 151         }
 152     }
 153 }
 154
 155 unsafe impl Sync for LookupHost {}
 156 unsafe impl Send for LookupHost {}
 157
 158 impl Drop for LookupHost {
 159     fn drop(&mut self) {
 160         unsafe { c::freeaddrinfo(self.original) }
 161     }
 162 }
 163
 164 pub fn lookup_host(host: &str) -> io::Result<LookupHost> {
 165     init();
 166
 167     let c_host = CString::new(host)?;
 168     let hints = c::addrinfo {
 169         ai_flags: 0,
 170         ai_family: 0,
 171         ai_socktype: c::SOCK_STREAM,
 172         ai_protocol: 0,
 173         ai_addrlen: 0,
 174         ai_addr: ptr::null_mut(),
 175         ai_canonname: ptr::null_mut(),
 176         ai_next: ptr::null_mut()
 177     };
 178     let mut res = ptr::null_mut();
 179     unsafe {
 180         cvt_gai(c::getaddrinfo(c_host.as_ptr(), ptr::null(), &hints,
 181                                &mut res))?;
 182         Ok(LookupHost { original: res, cur: res })
 183     }
 184 }
 185
 186 ////////////////////////////////////////////////////////////////////////////////
 187 // TCP streams
 188 ////////////////////////////////////////////////////////////////////////////////
 189
 190 pub struct TcpStream {
 191     inner: Socket,
 192 }
 193
 194 impl TcpStream {
 195     pub fn connect(addr: &SocketAddr) -> io::Result<TcpStream> {
 196         init();
 197
 198         let sock = Socket::new(addr, c::SOCK_STREAM)?;
 199
 200         let (addrp, len) = addr.into_inner();
 201         cvt_r(|| unsafe { c::connect(*sock.as_inner(), addrp, len) })?;
 202         Ok(TcpStream { inner: sock })
 203     }
 204
 205     pub fn socket(&self) -> &Socket { &self.inner }
 206
 207     pub fn into_socket(self) -> Socket { self.inner }
 208
 209     pub fn set_read_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
 210         self.inner.set_timeout(dur, c::SO_RCVTIMEO)
 211     }
 212
 213     pub fn set_write_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
 214         self.inner.set_timeout(dur, c::SO_SNDTIMEO)
 215     }
 216
 217     pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
 218         self.inner.timeout(c::SO_RCVTIMEO)
 219     }
 220
 221     pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
 222         self.inner.timeout(c::SO_SNDTIMEO)
 223     }
 224
 225     pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
 226         self.inner.peek(buf)
 227     }
 228
 229     pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
 230         self.inner.read(buf)
 231     }
 232
 233     pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
 234         self.inner.read_to_end(buf)
 235     }
 236
 237     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
 238         let len = cmp::min(buf.len(), <wrlen_t>::max_value() as usize) as wrlen_t;
 239         let ret = cvt(unsafe {
 240             c::send(*self.inner.as_inner(),
 241                     buf.as_ptr() as *const c_void,
 242                     len,
 243                     MSG_NOSIGNAL)
 244         })?;
 245         Ok(ret as usize)
 246     }
 247
 248     pub fn peer_addr(&self) -> io::Result<SocketAddr> {
 249         sockname(|buf, len| unsafe {
 250             c::getpeername(*self.inner.as_inner(), buf, len)
 251         })
 252     }
 253
 254     pub fn socket_addr(&self) -> io::Result<SocketAddr> {
 255         sockname(|buf, len| unsafe {
 256             c::getsockname(*self.inner.as_inner(), buf, len)
 257         })
 258     }
 259
 260     pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
 261         self.inner.shutdown(how)
 262     }
 263
 264     pub fn duplicate(&self) -> io::Result<TcpStream> {
 265         self.inner.duplicate().map(|s| TcpStream { inner: s })
 266     }
 267
 268     pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
 269         self.inner.set_nodelay(nodelay)
 270     }
 271
 272     pub fn nodelay(&self) -> io::Result<bool> {
 273         self.inner.nodelay()
 274     }
 275
 276     pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
 277         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_TTL, ttl as c_int)
 278     }
 279
 280     pub fn ttl(&self) -> io::Result<u32> {
 281         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_TTL)?;
 282         Ok(raw as u32)
 283     }
 284
 285     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
 286         self.inner.take_error()
 287     }
 288
 289     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
 290         self.inner.set_nonblocking(nonblocking)
 291     }
 292 }
 293
 294 impl FromInner<Socket> for TcpStream {
 295     fn from_inner(socket: Socket) -> TcpStream {
 296         TcpStream { inner: socket }
 297     }
 298 }
 299
 300 impl fmt::Debug for TcpStream {
 301     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 302         let mut res = f.debug_struct("TcpStream");
 303
 304         if let Ok(addr) = self.socket_addr() {
 305             res.field("addr", &addr);
 306         }
 307
 308         if let Ok(peer) = self.peer_addr() {
 309             res.field("peer", &peer);
 310         }
 311
 312         let name = if cfg!(windows) {"socket"} else {"fd"};
 313         res.field(name, &self.inner.as_inner())
 314             .finish()
 315     }
 316 }
 317
 318 ////////////////////////////////////////////////////////////////////////////////
 319 // TCP listeners
 320 ////////////////////////////////////////////////////////////////////////////////
 321
 322 pub struct TcpListener {
 323     inner: Socket,
 324 }
 325
 326 impl TcpListener {
 327     pub fn bind(addr: &SocketAddr) -> io::Result<TcpListener> {
 328         init();
 329
 330         let sock = Socket::new(addr, c::SOCK_STREAM)?;
 331
 332         // On platforms with Berkeley-derived sockets, this allows
 333         // to quickly rebind a socket, without needing to wait for
 334         // the OS to clean up the previous one.
 335         if !cfg!(windows) {
 336             setsockopt(&sock, c::SOL_SOCKET, c::SO_REUSEADDR,
 337                        1 as c_int)?;
 338         }
 339
 340         // Bind our new socket
 341         let (addrp, len) = addr.into_inner();
 342         cvt(unsafe { c::bind(*sock.as_inner(), addrp, len) })?;
 343
 344         // Start listening
 345         cvt(unsafe { c::listen(*sock.as_inner(), 128) })?;
 346         Ok(TcpListener { inner: sock })
 347     }
 348
 349     pub fn socket(&self) -> &Socket { &self.inner }
 350
 351     pub fn into_socket(self) -> Socket { self.inner }
 352
 353     pub fn socket_addr(&self) -> io::Result<SocketAddr> {
 354         sockname(|buf, len| unsafe {
 355             c::getsockname(*self.inner.as_inner(), buf, len)
 356         })
 357     }
 358
 359     pub fn accept(&self) -> io::Result<(TcpStream, SocketAddr)> {
 360         let mut storage: c::sockaddr_storage = unsafe { mem::zeroed() };
 361         let mut len = mem::size_of_val(&storage) as c::socklen_t;
 362         let sock = self.inner.accept(&mut storage as *mut _ as *mut _,
 363                                      &mut len)?;
 364         let addr = sockaddr_to_addr(&storage, len as usize)?;
 365         Ok((TcpStream { inner: sock, }, addr))
 366     }
 367
 368     pub fn duplicate(&self) -> io::Result<TcpListener> {
 369         self.inner.duplicate().map(|s| TcpListener { inner: s })
 370     }
 371
 372     pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
 373         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_TTL, ttl as c_int)
 374     }
 375
 376     pub fn ttl(&self) -> io::Result<u32> {
 377         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_TTL)?;
 378         Ok(raw as u32)
 379     }
 380
 381     pub fn set_only_v6(&self, only_v6: bool) -> io::Result<()> {
 382         setsockopt(&self.inner, c::IPPROTO_IPV6, c::IPV6_V6ONLY, only_v6 as c_int)
 383     }
 384
 385     pub fn only_v6(&self) -> io::Result<bool> {
 386         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IPV6, c::IPV6_V6ONLY)?;
 387         Ok(raw != 0)
 388     }
 389
 390     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
 391         self.inner.take_error()
 392     }
 393
 394     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
 395         self.inner.set_nonblocking(nonblocking)
 396     }
 397 }
 398
 399 impl FromInner<Socket> for TcpListener {
 400     fn from_inner(socket: Socket) -> TcpListener {
 401         TcpListener { inner: socket }
 402     }
 403 }
 404
 405 impl fmt::Debug for TcpListener {
 406     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 407         let mut res = f.debug_struct("TcpListener");
 408
 409         if let Ok(addr) = self.socket_addr() {
 410             res.field("addr", &addr);
 411         }
 412
 413         let name = if cfg!(windows) {"socket"} else {"fd"};
 414         res.field(name, &self.inner.as_inner())
 415             .finish()
 416     }
 417 }
 418
 419 ////////////////////////////////////////////////////////////////////////////////
 420 // UDP
 421 ////////////////////////////////////////////////////////////////////////////////
 422
 423 pub struct UdpSocket {
 424     inner: Socket,
 425 }
 426
 427 impl UdpSocket {
 428     pub fn bind(addr: &SocketAddr) -> io::Result<UdpSocket> {
 429         init();
 430
 431         let sock = Socket::new(addr, c::SOCK_DGRAM)?;
 432         let (addrp, len) = addr.into_inner();
 433         cvt(unsafe { c::bind(*sock.as_inner(), addrp, len) })?;
 434         Ok(UdpSocket { inner: sock })
 435     }
 436
 437     pub fn socket(&self) -> &Socket { &self.inner }
 438
 439     pub fn into_socket(self) -> Socket { self.inner }
 440
 441     pub fn socket_addr(&self) -> io::Result<SocketAddr> {
 442         sockname(|buf, len| unsafe {
 443             c::getsockname(*self.inner.as_inner(), buf, len)
 444         })
 445     }
 446
 447     pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
 448         self.inner.recv_from(buf)
 449     }
 450
 451     pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
 452         self.inner.peek_from(buf)
 453     }
 454
 455     pub fn send_to(&self, buf: &[u8], dst: &SocketAddr) -> io::Result<usize> {
 456         let len = cmp::min(buf.len(), <wrlen_t>::max_value() as usize) as wrlen_t;
 457         let (dstp, dstlen) = dst.into_inner();
 458         let ret = cvt(unsafe {
 459             c::sendto(*self.inner.as_inner(),
 460                       buf.as_ptr() as *const c_void, len,
 461                       MSG_NOSIGNAL, dstp, dstlen)
 462         })?;
 463         Ok(ret as usize)
 464     }
 465
 466     pub fn duplicate(&self) -> io::Result<UdpSocket> {
 467         self.inner.duplicate().map(|s| UdpSocket { inner: s })
 468     }
 469
 470     pub fn set_read_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
 471         self.inner.set_timeout(dur, c::SO_RCVTIMEO)
 472     }
 473
 474     pub fn set_write_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
 475         self.inner.set_timeout(dur, c::SO_SNDTIMEO)
 476     }
 477
 478     pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
 479         self.inner.timeout(c::SO_RCVTIMEO)
 480     }
 481
 482     pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
 483         self.inner.timeout(c::SO_SNDTIMEO)
 484     }
 485
 486     pub fn set_broadcast(&self, broadcast: bool) -> io::Result<()> {
 487         setsockopt(&self.inner, c::SOL_SOCKET, c::SO_BROADCAST, broadcast as c_int)
 488     }
 489
 490     pub fn broadcast(&self) -> io::Result<bool> {
 491         let raw: c_int = getsockopt(&self.inner, c::SOL_SOCKET, c::SO_BROADCAST)?;
 492         Ok(raw != 0)
 493     }
 494
 495     pub fn set_multicast_loop_v4(&self, multicast_loop_v4: bool) -> io::Result<()> {
 496         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_LOOP, multicast_loop_v4 as c_int)
 497     }
 498
 499     pub fn multicast_loop_v4(&self) -> io::Result<bool> {
 500         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_LOOP)?;
 501         Ok(raw != 0)
 502     }
 503
 504     pub fn set_multicast_ttl_v4(&self, multicast_ttl_v4: u32) -> io::Result<()> {
 505         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_TTL, multicast_ttl_v4 as c_int)
 506     }
 507
 508     pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
 509         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_MULTICAST_TTL)?;
 510         Ok(raw as u32)
 511     }
 512
 513     pub fn set_multicast_loop_v6(&self, multicast_loop_v6: bool) -> io::Result<()> {
 514         setsockopt(&self.inner, c::IPPROTO_IPV6, c::IPV6_MULTICAST_LOOP, multicast_loop_v6 as c_int)
 515     }
 516
 517     pub fn multicast_loop_v6(&self) -> io::Result<bool> {
 518         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IPV6, c::IPV6_MULTICAST_LOOP)?;
 519         Ok(raw != 0)
 520     }
 521
 522     pub fn join_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr)
 523                          -> io::Result<()> {
 524         let mreq = c::ip_mreq {
 525             imr_multiaddr: *multiaddr.as_inner(),
 526             imr_interface: *interface.as_inner(),
 527         };
 528         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreq)
 529     }
 530
 531     pub fn join_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32)
 532                          -> io::Result<()> {
 533         let mreq = c::ipv6_mreq {
 534             ipv6mr_multiaddr: *multiaddr.as_inner(),
 535             ipv6mr_interface: to_ipv6mr_interface(interface),
 536         };
 537         setsockopt(&self.inner, c::IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, mreq)
 538     }
 539
 540     pub fn leave_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr)
 541                           -> io::Result<()> {
 542         let mreq = c::ip_mreq {
 543             imr_multiaddr: *multiaddr.as_inner(),
 544             imr_interface: *interface.as_inner(),
 545         };
 546         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreq)
 547     }
 548
 549     pub fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32)
 550                           -> io::Result<()> {
 551         let mreq = c::ipv6_mreq {
 552             ipv6mr_multiaddr: *multiaddr.as_inner(),
 553             ipv6mr_interface: to_ipv6mr_interface(interface),
 554         };
 555         setsockopt(&self.inner, c::IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, mreq)
 556     }
 557
 558     pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
 559         setsockopt(&self.inner, c::IPPROTO_IP, c::IP_TTL, ttl as c_int)
 560     }
 561
 562     pub fn ttl(&self) -> io::Result<u32> {
 563         let raw: c_int = getsockopt(&self.inner, c::IPPROTO_IP, c::IP_TTL)?;
 564         Ok(raw as u32)
 565     }
 566
 567     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
 568         self.inner.take_error()
 569     }
 570
 571     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
 572         self.inner.set_nonblocking(nonblocking)
 573     }
 574
 575     pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
 576         self.inner.read(buf)
 577     }
 578
 579     pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
 580         self.inner.peek(buf)
 581     }
 582
 583     pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
 584         let len = cmp::min(buf.len(), <wrlen_t>::max_value() as usize) as wrlen_t;
 585         let ret = cvt(unsafe {
 586             c::send(*self.inner.as_inner(),
 587                     buf.as_ptr() as *const c_void,
 588                     len,
 589                     MSG_NOSIGNAL)
 590         })?;
 591         Ok(ret as usize)
 592     }
 593
 594     pub fn connect(&self, addr: &SocketAddr) -> io::Result<()> {
 595         let (addrp, len) = addr.into_inner();
 596         cvt_r(|| unsafe { c::connect(*self.inner.as_inner(), addrp, len) }).map(|_| ())
 597     }
 598 }
 599
 600 impl FromInner<Socket> for UdpSocket {
 601     fn from_inner(socket: Socket) -> UdpSocket {
 602         UdpSocket { inner: socket }
 603     }
 604 }
 605
 606 impl fmt::Debug for UdpSocket {
 607     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 608         let mut res = f.debug_struct("UdpSocket");
 609
 610         if let Ok(addr) = self.socket_addr() {
 611             res.field("addr", &addr);
 612         }
 613
 614         let name = if cfg!(windows) {"socket"} else {"fd"};
 615         res.field(name, &self.inner.as_inner())
 616             .finish()
 617     }
 618 }
 619
 620 #[cfg(test)]
 621 mod tests {
 622     use super::*;
 623     use collections::HashMap;
 624
 625     #[test]
 626     fn no_lookup_host_duplicates() {
 627         let mut addrs = HashMap::new();
 628         let lh = match lookup_host("localhost") {
 629             Ok(lh) => lh,
 630             Err(e) => panic!("couldn't resolve `localhost': {}", e)
 631         };
 632         let _na = lh.map(|sa| *addrs.entry(sa).or_insert(0) += 1).count();
 633         assert!(addrs.values().filter(|&&v| v > 1).count() == 0);
 634     }
 635 }