src/libstd/sys/unix/net.rs - third_party/rust - Git at Google

 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 use prelude::v1::*;

 use ffi::CStr;
 use io;
 use libc::{self, c_int, size_t, sockaddr, socklen_t};
 use net::{SocketAddr, Shutdown};
 use str;
 use sys::fd::FileDesc;
 use sys_common::{AsInner, FromInner, IntoInner};
 use sys_common::net::{getsockopt, setsockopt};
 use time::Duration;

 pub use sys::{cvt, cvt_r};
 pub extern crate libc as netc;

 pub type wrlen_t = size_t;

 // See below for the usage of SOCK_CLOEXEC, but this constant is only defined on
 // Linux currently (e.g. support doesn't exist on other platforms). In order to
 // get name resolution to work and things to compile we just define a dummy
 // SOCK_CLOEXEC here for other platforms. Note that the dummy constant isn't
 // actually ever used (the blocks below are wrapped in `if cfg!` as well.
 #[cfg(target_os = "linux")]
 use libc::SOCK_CLOEXEC;
 #[cfg(not(target_os = "linux"))]
 const SOCK_CLOEXEC: c_int = 0;

 pub struct Socket(FileDesc);

 pub fn init() {}

 pub fn cvt_gai(err: c_int) -> io::Result<()> {
     if err == 0 { return Ok(()) }

     let detail = unsafe {
         str::from_utf8(CStr::from_ptr(libc::gai_strerror(err)).to_bytes()).unwrap()
             .to_owned()
     };
     Err(io::Error::new(io::ErrorKind::Other,
                        &format!("failed to lookup address information: {}",
                                 detail)[..]))
 }

 impl Socket {
     pub fn new(addr: &SocketAddr, ty: c_int) -> io::Result<Socket> {
         let fam = match *addr {
             SocketAddr::V4(..) => libc::AF_INET,
             SocketAddr::V6(..) => libc::AF_INET6,
         };
         Socket::new_raw(fam, ty)
     }

     pub fn new_raw(fam: c_int, ty: c_int) -> io::Result<Socket> {
         unsafe {
             // On linux we first attempt to pass the SOCK_CLOEXEC flag to
             // atomically create the socket and set it as CLOEXEC. Support for
             // this option, however, was added in 2.6.27, and we still support
             // 2.6.18 as a kernel, so if the returned error is EINVAL we
             // fallthrough to the fallback.
             if cfg!(linux) {
                 match cvt(libc::socket(fam, ty | SOCK_CLOEXEC, 0)) {
                     Ok(fd) => return Ok(Socket(FileDesc::new(fd))),
                     Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {}
                     Err(e) => return Err(e),
                 }
             }

             let fd = cvt(libc::socket(fam, ty, 0))?;
             let fd = FileDesc::new(fd);
             fd.set_cloexec()?;
             Ok(Socket(fd))
         }
     }

     pub fn new_pair(fam: c_int, ty: c_int) -> io::Result<(Socket, Socket)> {
         unsafe {
             let mut fds = [0, 0];

             // Like above, see if we can set cloexec atomically
             if cfg!(linux) {
                 match cvt(libc::socketpair(fam, ty | SOCK_CLOEXEC, 0, fds.as_mut_ptr())) {
                     Ok(_) => {
                         return Ok((Socket(FileDesc::new(fds[0])), Socket(FileDesc::new(fds[1]))));
                     }
                     Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {},
                     Err(e) => return Err(e),
                 }
             }

             cvt(libc::socketpair(fam, ty, 0, fds.as_mut_ptr()))?;
             let a = FileDesc::new(fds[0]);
             let b = FileDesc::new(fds[1]);
             a.set_cloexec()?;
             b.set_cloexec()?;
             Ok((Socket(a), Socket(b)))
         }
     }

     pub fn accept(&self, storage: *mut sockaddr, len: *mut socklen_t)
                   -> io::Result<Socket> {
         // Unfortunately the only known way right now to accept a socket and
         // atomically set the CLOEXEC flag is to use the `accept4` syscall on
         // Linux. This was added in 2.6.28, however, and because we support
         // 2.6.18 we must detect this support dynamically.
         if cfg!(target_os = "linux") {
             weak! {
                 fn accept4(c_int, *mut sockaddr, *mut socklen_t, c_int) -> c_int
             }
             if let Some(accept) = accept4.get() {
                 let res = cvt_r(|| unsafe {
                     accept(self.0.raw(), storage, len, SOCK_CLOEXEC)
                 });
                 match res {
                     Ok(fd) => return Ok(Socket(FileDesc::new(fd))),
                     Err(ref e) if e.raw_os_error() == Some(libc::ENOSYS) => {}
                     Err(e) => return Err(e),
                 }
             }
         }

         let fd = cvt_r(|| unsafe {
             libc::accept(self.0.raw(), storage, len)
         })?;
         let fd = FileDesc::new(fd);
         fd.set_cloexec()?;
         Ok(Socket(fd))
     }

     pub fn duplicate(&self) -> io::Result<Socket> {
         self.0.duplicate().map(Socket)
     }

     pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
         self.0.read(buf)
     }

     pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
         self.0.read_to_end(buf)
     }

     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }

     pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
         let timeout = match dur {
             Some(dur) => {
                 if dur.as_secs() == 0 && dur.subsec_nanos() == 0 {
                     return Err(io::Error::new(io::ErrorKind::InvalidInput,
                                               "cannot set a 0 duration timeout"));
                 }

                 let secs = if dur.as_secs() > libc::time_t::max_value() as u64 {
                     libc::time_t::max_value()
                 } else {
                     dur.as_secs() as libc::time_t
                 };
                 let mut timeout = libc::timeval {
                     tv_sec: secs,
                     tv_usec: (dur.subsec_nanos() / 1000) as libc::suseconds_t,
                 };
                 if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
                     timeout.tv_usec = 1;
                 }
                 timeout
             }
             None => {
                 libc::timeval {
                     tv_sec: 0,
                     tv_usec: 0,
                 }
             }
         };
         setsockopt(self, libc::SOL_SOCKET, kind, timeout)
     }

     pub fn timeout(&self, kind: libc::c_int) -> io::Result<Option<Duration>> {
         let raw: libc::timeval = getsockopt(self, libc::SOL_SOCKET, kind)?;
         if raw.tv_sec == 0 && raw.tv_usec == 0 {
             Ok(None)
         } else {
             let sec = raw.tv_sec as u64;
             let nsec = (raw.tv_usec as u32) * 1000;
             Ok(Some(Duration::new(sec, nsec)))
         }
     }

     pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
         let how = match how {
             Shutdown::Write => libc::SHUT_WR,
             Shutdown::Read => libc::SHUT_RD,
             Shutdown::Both => libc::SHUT_RDWR,
         };
         cvt(unsafe { libc::shutdown(self.0.raw(), how) })?;
         Ok(())
     }

     pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
         setsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY, nodelay as c_int)
     }

     pub fn nodelay(&self) -> io::Result<bool> {
         let raw: c_int = getsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY)?;
         Ok(raw != 0)
     }

     pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
         let mut nonblocking = nonblocking as libc::c_ulong;
         cvt(unsafe { libc::ioctl(*self.as_inner(), libc::FIONBIO, &mut nonblocking) }).map(|_| ())
     }

     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
         let raw: c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_ERROR)?;
         if raw == 0 {
             Ok(None)
         } else {
             Ok(Some(io::Error::from_raw_os_error(raw as i32)))
         }
     }
 }

 impl AsInner<c_int> for Socket {
     fn as_inner(&self) -> &c_int { self.0.as_inner() }
 }

 impl FromInner<c_int> for Socket {
     fn from_inner(fd: c_int) -> Socket { Socket(FileDesc::new(fd)) }
 }

 impl IntoInner<c_int> for Socket {
     fn into_inner(self) -> c_int { self.0.into_raw() }
 }
	// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
	// file at the top-level directory of this distribution and at
	// http://rust-lang.org/COPYRIGHT.
	//
	// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
	// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
	// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
	// option. This file may not be copied, modified, or distributed
	// except according to those terms.

	use prelude::v1::*;

	use ffi::CStr;
	use io;
	use libc::{self, c_int, size_t, sockaddr, socklen_t};
	use net::{SocketAddr, Shutdown};
	use str;
	use sys::fd::FileDesc;
	use sys_common::{AsInner, FromInner, IntoInner};
	use sys_common::net::{getsockopt, setsockopt};
	use time::Duration;

	pub use sys::{cvt, cvt_r};
	pub extern crate libc as netc;

	pub type wrlen_t = size_t;

	// See below for the usage of SOCK_CLOEXEC, but this constant is only defined on
	// Linux currently (e.g. support doesn't exist on other platforms). In order to
	// get name resolution to work and things to compile we just define a dummy
	// SOCK_CLOEXEC here for other platforms. Note that the dummy constant isn't
	// actually ever used (the blocks below are wrapped in `if cfg!` as well.
	#[cfg(target_os = "linux")]
	use libc::SOCK_CLOEXEC;
	#[cfg(not(target_os = "linux"))]
	const SOCK_CLOEXEC: c_int = 0;

	pub struct Socket(FileDesc);

	pub fn init() {}

	pub fn cvt_gai(err: c_int) -> io::Result<()> {
	if err == 0 { return Ok(()) }

	let detail = unsafe {
	str::from_utf8(CStr::from_ptr(libc::gai_strerror(err)).to_bytes()).unwrap()
	.to_owned()
	};
	Err(io::Error::new(io::ErrorKind::Other,
	&format!("failed to lookup address information: {}",
	detail)[..]))
	}

	impl Socket {
	pub fn new(addr: &SocketAddr, ty: c_int) -> io::Result<Socket> {
	let fam = match *addr {
	SocketAddr::V4(..) => libc::AF_INET,
	SocketAddr::V6(..) => libc::AF_INET6,
	};
	Socket::new_raw(fam, ty)
	}

	pub fn new_raw(fam: c_int, ty: c_int) -> io::Result<Socket> {
	unsafe {
	// On linux we first attempt to pass the SOCK_CLOEXEC flag to
	// atomically create the socket and set it as CLOEXEC. Support for
	// this option, however, was added in 2.6.27, and we still support
	// 2.6.18 as a kernel, so if the returned error is EINVAL we
	// fallthrough to the fallback.
	if cfg!(linux) {
	match cvt(libc::socket(fam, ty \| SOCK_CLOEXEC, 0)) {
	Ok(fd) => return Ok(Socket(FileDesc::new(fd))),
	Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {}
	Err(e) => return Err(e),
	}
	}

	let fd = cvt(libc::socket(fam, ty, 0))?;
	let fd = FileDesc::new(fd);
	fd.set_cloexec()?;
	Ok(Socket(fd))
	}
	}

	pub fn new_pair(fam: c_int, ty: c_int) -> io::Result<(Socket, Socket)> {
	unsafe {
	let mut fds = [0, 0];

	// Like above, see if we can set cloexec atomically
	if cfg!(linux) {
	match cvt(libc::socketpair(fam, ty \| SOCK_CLOEXEC, 0, fds.as_mut_ptr())) {
	Ok(_) => {
	return Ok((Socket(FileDesc::new(fds[0])), Socket(FileDesc::new(fds[1]))));
	}
	Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {},
	Err(e) => return Err(e),
	}
	}

	cvt(libc::socketpair(fam, ty, 0, fds.as_mut_ptr()))?;
	let a = FileDesc::new(fds[0]);
	let b = FileDesc::new(fds[1]);
	a.set_cloexec()?;
	b.set_cloexec()?;
	Ok((Socket(a), Socket(b)))
	}
	}

	pub fn accept(&self, storage: mut sockaddr, len: mut socklen_t)
	-> io::Result<Socket> {
	// Unfortunately the only known way right now to accept a socket and
	// atomically set the CLOEXEC flag is to use the `accept4` syscall on
	// Linux. This was added in 2.6.28, however, and because we support
	// 2.6.18 we must detect this support dynamically.
	if cfg!(target_os = "linux") {
	weak! {
	fn accept4(c_int, mut sockaddr, mut socklen_t, c_int) -> c_int
	}
	if let Some(accept) = accept4.get() {
	let res = cvt_r(\|\| unsafe {
	accept(self.0.raw(), storage, len, SOCK_CLOEXEC)
	});
	match res {
	Ok(fd) => return Ok(Socket(FileDesc::new(fd))),
	Err(ref e) if e.raw_os_error() == Some(libc::ENOSYS) => {}
	Err(e) => return Err(e),
	}
	}
	}

	let fd = cvt_r(\|\| unsafe {
	libc::accept(self.0.raw(), storage, len)
	})?;
	let fd = FileDesc::new(fd);
	fd.set_cloexec()?;
	Ok(Socket(fd))
	}

	pub fn duplicate(&self) -> io::Result<Socket> {
	self.0.duplicate().map(Socket)
	}

	pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
	self.0.read(buf)
	}

	pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
	self.0.read_to_end(buf)
	}

	pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
	self.0.write(buf)
	}

	pub fn set_timeout(&self, dur: Option<Duration>, kind: libc::c_int) -> io::Result<()> {
	let timeout = match dur {
	Some(dur) => {
	if dur.as_secs() == 0 && dur.subsec_nanos() == 0 {
	return Err(io::Error::new(io::ErrorKind::InvalidInput,
	"cannot set a 0 duration timeout"));
	}

	let secs = if dur.as_secs() > libc::time_t::max_value() as u64 {
	libc::time_t::max_value()
	} else {
	dur.as_secs() as libc::time_t
	};
	let mut timeout = libc::timeval {
	tv_sec: secs,
	tv_usec: (dur.subsec_nanos() / 1000) as libc::suseconds_t,
	};
	if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
	timeout.tv_usec = 1;
	}
	timeout
	}
	None => {
	libc::timeval {
	tv_sec: 0,
	tv_usec: 0,
	}
	}
	};
	setsockopt(self, libc::SOL_SOCKET, kind, timeout)
	}

	pub fn timeout(&self, kind: libc::c_int) -> io::Result<Option<Duration>> {
	let raw: libc::timeval = getsockopt(self, libc::SOL_SOCKET, kind)?;
	if raw.tv_sec == 0 && raw.tv_usec == 0 {
	Ok(None)
	} else {
	let sec = raw.tv_sec as u64;
	let nsec = (raw.tv_usec as u32) * 1000;
	Ok(Some(Duration::new(sec, nsec)))
	}
	}

	pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
	let how = match how {
	Shutdown::Write => libc::SHUT_WR,
	Shutdown::Read => libc::SHUT_RD,
	Shutdown::Both => libc::SHUT_RDWR,
	};
	cvt(unsafe { libc::shutdown(self.0.raw(), how) })?;
	Ok(())
	}

	pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
	setsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY, nodelay as c_int)
	}

	pub fn nodelay(&self) -> io::Result<bool> {
	let raw: c_int = getsockopt(self, libc::IPPROTO_TCP, libc::TCP_NODELAY)?;
	Ok(raw != 0)
	}

	pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
	let mut nonblocking = nonblocking as libc::c_ulong;
	cvt(unsafe { libc::ioctl(*self.as_inner(), libc::FIONBIO, &mut nonblocking) }).map(\|_\| ())
	}

	pub fn take_error(&self) -> io::Result<Option<io::Error>> {
	let raw: c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_ERROR)?;
	if raw == 0 {
	Ok(None)
	} else {
	Ok(Some(io::Error::from_raw_os_error(raw as i32)))
	}
	}
	}

	impl AsInner<c_int> for Socket {
	fn as_inner(&self) -> &c_int { self.0.as_inner() }
	}

	impl FromInner<c_int> for Socket {
	fn from_inner(fd: c_int) -> Socket { Socket(FileDesc::new(fd)) }
	}

	impl IntoInner<c_int> for Socket {
	fn into_inner(self) -> c_int { self.0.into_raw() }
	}