Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1103 insertions, 0 deletions

diff --git a/third_party/rust/socket2/src/sys/unix.rs b/third_party/rust/socket2/src/sys/unix.rs
new file mode 100644
index 0000000000..cacbcb5fb3
--- /dev/null
+++ b/third_party/rust/socket2/src/sys/unix.rs
@@ -0,0 +1,1103 @@
+// 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 std::cmp;
+use std::fmt;
+use std::io;
+use std::io::{ErrorKind, Read, Write};
+use std::mem;
+use std::net::Shutdown;
+use std::net::{self, Ipv4Addr, Ipv6Addr};
+use std::ops::Neg;
+#[cfg(feature = "unix")]
+use std::os::unix::net::{UnixDatagram, UnixListener, UnixStream};
+use std::os::unix::prelude::*;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::time::{Duration, Instant};
+
+use libc::{self, c_int, c_void, socklen_t, ssize_t};
+
+cfg_if::cfg_if! {
+    if #[cfg(any(target_os = "dragonfly", target_os = "freebsd",
+                 target_os = "ios", target_os = "macos",
+                 target_os = "openbsd", target_os = "netbsd",
+                 target_os = "solaris", target_os = "haiku"))] {
+        use libc::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
+        use libc::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
+    } else {
+        use libc::IPV6_ADD_MEMBERSHIP;
+        use libc::IPV6_DROP_MEMBERSHIP;
+    }
+}
+
+cfg_if::cfg_if! {
+    if #[cfg(any(target_os = "linux", target_os = "android",
+                 target_os = "dragonfly", target_os = "freebsd",
+                 target_os = "openbsd", target_os = "netbsd",
+                 target_os = "haiku", target_os = "bitrig"))] {
+        use libc::MSG_NOSIGNAL;
+    } else {
+        const MSG_NOSIGNAL: c_int = 0x0;
+    }
+}
+
+cfg_if::cfg_if! {
+    if #[cfg(any(target_os = "macos", target_os = "ios"))] {
+        use libc::TCP_KEEPALIVE as KEEPALIVE_OPTION;
+    } else if #[cfg(any(target_os = "openbsd", target_os = "netbsd", target_os = "haiku"))] {
+        use libc::SO_KEEPALIVE as KEEPALIVE_OPTION;
+    } else {
+        use libc::TCP_KEEPIDLE as KEEPALIVE_OPTION;
+    }
+}
+
+use crate::utils::One;
+use crate::SockAddr;
+
+pub const IPPROTO_ICMP: i32 = libc::IPPROTO_ICMP;
+pub const IPPROTO_ICMPV6: i32 = libc::IPPROTO_ICMPV6;
+pub const IPPROTO_TCP: i32 = libc::IPPROTO_TCP;
+pub const IPPROTO_UDP: i32 = libc::IPPROTO_UDP;
+pub const SOCK_SEQPACKET: i32 = libc::SOCK_SEQPACKET;
+pub const SOCK_RAW: i32 = libc::SOCK_RAW;
+
+pub struct Socket {
+    fd: c_int,
+}
+
+impl Socket {
+    pub fn new(family: c_int, ty: c_int, protocol: 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.
+            #[cfg(target_os = "linux")]
+            {
+                match cvt(libc::socket(family, ty | libc::SOCK_CLOEXEC, protocol)) {
+                    Ok(fd) => return Ok(Socket::from_raw_fd(fd)),
+                    Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {}
+                    Err(e) => return Err(e),
+                }
+            }
+
+            let fd = cvt(libc::socket(family, ty, protocol))?;
+            let fd = Socket::from_raw_fd(fd);
+            set_cloexec(fd.as_raw_fd())?;
+            #[cfg(target_os = "macos")]
+            {
+                fd.setsockopt(libc::SOL_SOCKET, libc::SO_NOSIGPIPE, 1i32)?;
+            }
+            Ok(fd)
+        }
+    }
+
+    pub fn pair(family: c_int, ty: c_int, protocol: c_int) -> io::Result<(Socket, Socket)> {
+        unsafe {
+            let mut fds = [0, 0];
+            cvt(libc::socketpair(family, ty, protocol, fds.as_mut_ptr()))?;
+            let fds = (Socket::from_raw_fd(fds[0]), Socket::from_raw_fd(fds[1]));
+            set_cloexec(fds.0.as_raw_fd())?;
+            set_cloexec(fds.1.as_raw_fd())?;
+            #[cfg(target_os = "macos")]
+            {
+                fds.0
+                    .setsockopt(libc::SOL_SOCKET, libc::SO_NOSIGPIPE, 1i32)?;
+                fds.1
+                    .setsockopt(libc::SOL_SOCKET, libc::SO_NOSIGPIPE, 1i32)?;
+            }
+            Ok(fds)
+        }
+    }
+
+    pub fn bind(&self, addr: &SockAddr) -> io::Result<()> {
+        unsafe { cvt(libc::bind(self.fd, addr.as_ptr(), addr.len() as _)).map(|_| ()) }
+    }
+
+    pub fn listen(&self, backlog: i32) -> io::Result<()> {
+        unsafe { cvt(libc::listen(self.fd, backlog)).map(|_| ()) }
+    }
+
+    pub fn connect(&self, addr: &SockAddr) -> io::Result<()> {
+        unsafe { cvt(libc::connect(self.fd, addr.as_ptr(), addr.len())).map(|_| ()) }
+    }
+
+    pub fn connect_timeout(&self, addr: &SockAddr, timeout: Duration) -> io::Result<()> {
+        self.set_nonblocking(true)?;
+        let r = self.connect(addr);
+        self.set_nonblocking(false)?;
+
+        match r {
+            Ok(()) => return Ok(()),
+            // there's no io::ErrorKind conversion registered for EINPROGRESS :(
+            Err(ref e) if e.raw_os_error() == Some(libc::EINPROGRESS) => {}
+            Err(e) => return Err(e),
+        }
+
+        let mut pollfd = libc::pollfd {
+            fd: self.fd,
+            events: libc::POLLOUT,
+            revents: 0,
+        };
+
+        if timeout.as_secs() == 0 && timeout.subsec_nanos() == 0 {
+            return Err(io::Error::new(
+                io::ErrorKind::InvalidInput,
+                "cannot set a 0 duration timeout",
+            ));
+        }
+
+        let start = Instant::now();
+
+        loop {
+            let elapsed = start.elapsed();
+            if elapsed >= timeout {
+                return Err(io::Error::new(
+                    io::ErrorKind::TimedOut,
+                    "connection timed out",
+                ));
+            }
+
+            let timeout = timeout - elapsed;
+            let mut timeout = timeout
+                .as_secs()
+                .saturating_mul(1_000)
+                .saturating_add(timeout.subsec_nanos() as u64 / 1_000_000);
+            if timeout == 0 {
+                timeout = 1;
+            }
+
+            let timeout = cmp::min(timeout, c_int::max_value() as u64) as c_int;
+
+            match unsafe { libc::poll(&mut pollfd, 1, timeout) } {
+                -1 => {
+                    let err = io::Error::last_os_error();
+                    if err.kind() != io::ErrorKind::Interrupted {
+                        return Err(err);
+                    }
+                }
+                0 => {
+                    return Err(io::Error::new(
+                        io::ErrorKind::TimedOut,
+                        "connection timed out",
+                    ))
+                }
+                _ => {
+                    // linux returns POLLOUT|POLLERR|POLLHUP for refused connections (!), so look
+                    // for POLLHUP rather than read readiness
+                    if pollfd.revents & libc::POLLHUP != 0 {
+                        let e = self.take_error()?.unwrap_or_else(|| {
+                            io::Error::new(io::ErrorKind::Other, "no error set after POLLHUP")
+                        });
+                        return Err(e);
+                    }
+                    return Ok(());
+                }
+            }
+        }
+    }
+
+    pub fn local_addr(&self) -> io::Result<SockAddr> {
+        unsafe {
+            let mut storage: libc::sockaddr_storage = mem::zeroed();
+            let mut len = mem::size_of_val(&storage) as libc::socklen_t;
+            cvt(libc::getsockname(
+                self.fd,
+                &mut storage as *mut _ as *mut _,
+                &mut len,
+            ))?;
+            Ok(SockAddr::from_raw_parts(
+                &storage as *const _ as *const _,
+                len,
+            ))
+        }
+    }
+
+    pub fn peer_addr(&self) -> io::Result<SockAddr> {
+        unsafe {
+            let mut storage: libc::sockaddr_storage = mem::zeroed();
+            let mut len = mem::size_of_val(&storage) as libc::socklen_t;
+            cvt(libc::getpeername(
+                self.fd,
+                &mut storage as *mut _ as *mut _,
+                &mut len,
+            ))?;
+            Ok(SockAddr::from_raw_parts(
+                &storage as *const _ as *const _,
+                len,
+            ))
+        }
+    }
+
+    pub fn try_clone(&self) -> io::Result<Socket> {
+        // implementation lifted from libstd
+        #[cfg(any(target_os = "android", target_os = "haiku"))]
+        use libc::F_DUPFD as F_DUPFD_CLOEXEC;
+        #[cfg(not(any(target_os = "android", target_os = "haiku")))]
+        use libc::F_DUPFD_CLOEXEC;
+
+        static CLOEXEC_FAILED: AtomicBool = AtomicBool::new(false);
+        unsafe {
+            if !CLOEXEC_FAILED.load(Ordering::Relaxed) {
+                match cvt(libc::fcntl(self.fd, F_DUPFD_CLOEXEC, 0)) {
+                    Ok(fd) => {
+                        let fd = Socket::from_raw_fd(fd);
+                        if cfg!(target_os = "linux") {
+                            set_cloexec(fd.as_raw_fd())?;
+                        }
+                        return Ok(fd);
+                    }
+                    Err(ref e) if e.raw_os_error() == Some(libc::EINVAL) => {
+                        CLOEXEC_FAILED.store(true, Ordering::Relaxed);
+                    }
+                    Err(e) => return Err(e),
+                }
+            }
+            let fd = cvt(libc::fcntl(self.fd, libc::F_DUPFD, 0))?;
+            let fd = Socket::from_raw_fd(fd);
+            set_cloexec(fd.as_raw_fd())?;
+            Ok(fd)
+        }
+    }
+
+    #[allow(unused_mut)]
+    pub fn accept(&self) -> io::Result<(Socket, SockAddr)> {
+        let mut storage: libc::sockaddr_storage = unsafe { mem::zeroed() };
+        let mut len = mem::size_of_val(&storage) as socklen_t;
+
+        let mut socket = None;
+        #[cfg(target_os = "linux")]
+        {
+            let res = cvt_r(|| unsafe {
+                libc::syscall(
+                    libc::SYS_accept4,
+                    self.fd as libc::c_long,
+                    &mut storage as *mut _ as libc::c_long,
+                    len as libc::c_long,
+                    libc::SOCK_CLOEXEC as libc::c_long,
+                ) as libc::c_int
+            });
+            match res {
+                Ok(fd) => socket = Some(Socket { fd: fd }),
+                Err(ref e) if e.raw_os_error() == Some(libc::ENOSYS) => {}
+                Err(e) => return Err(e),
+            }
+        }
+
+        let socket = match socket {
+            Some(socket) => socket,
+            None => unsafe {
+                let fd =
+                    cvt_r(|| libc::accept(self.fd, &mut storage as *mut _ as *mut _, &mut len))?;
+                let fd = Socket::from_raw_fd(fd);
+                set_cloexec(fd.as_raw_fd())?;
+                fd
+            },
+        };
+        let addr = unsafe { SockAddr::from_raw_parts(&storage as *const _ as *const _, len) };
+        Ok((socket, addr))
+    }
+
+    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_ERROR)?;
+            if raw == 0 {
+                Ok(None)
+            } else {
+                Ok(Some(io::Error::from_raw_os_error(raw as i32)))
+            }
+        }
+    }
+
+    pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
+        unsafe {
+            let previous = cvt(libc::fcntl(self.fd, libc::F_GETFL))?;
+            let new = if nonblocking {
+                previous | libc::O_NONBLOCK
+            } else {
+                previous & !libc::O_NONBLOCK
+            };
+            if new != previous {
+                cvt(libc::fcntl(self.fd, libc::F_SETFL, new))?;
+            }
+            Ok(())
+        }
+    }
+
+    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.fd, how) })?;
+        Ok(())
+    }
+
+    pub fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
+        unsafe {
+            let n = cvt({
+                libc::recv(
+                    self.fd,
+                    buf.as_mut_ptr() as *mut c_void,
+                    cmp::min(buf.len(), max_len()),
+                    0,
+                )
+            })?;
+            Ok(n as usize)
+        }
+    }
+
+    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
+        unsafe {
+            let n = cvt({
+                libc::recv(
+                    self.fd,
+                    buf.as_mut_ptr() as *mut c_void,
+                    cmp::min(buf.len(), max_len()),
+                    libc::MSG_PEEK,
+                )
+            })?;
+            Ok(n as usize)
+        }
+    }
+
+    pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SockAddr)> {
+        self.recvfrom(buf, 0)
+    }
+
+    pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SockAddr)> {
+        self.recvfrom(buf, libc::MSG_PEEK)
+    }
+
+    fn recvfrom(&self, buf: &mut [u8], flags: c_int) -> io::Result<(usize, SockAddr)> {
+        unsafe {
+            let mut storage: libc::sockaddr_storage = mem::zeroed();
+            let mut addrlen = mem::size_of_val(&storage) as socklen_t;
+
+            let n = cvt({
+                libc::recvfrom(
+                    self.fd,
+                    buf.as_mut_ptr() as *mut c_void,
+                    cmp::min(buf.len(), max_len()),
+                    flags,
+                    &mut storage as *mut _ as *mut _,
+                    &mut addrlen,
+                )
+            })?;
+            let addr = SockAddr::from_raw_parts(&storage as *const _ as *const _, addrlen);
+            Ok((n as usize, addr))
+        }
+    }
+
+    pub fn send(&self, buf: &[u8]) -> io::Result<usize> {
+        unsafe {
+            let n = cvt({
+                libc::send(
+                    self.fd,
+                    buf.as_ptr() as *const c_void,
+                    cmp::min(buf.len(), max_len()),
+                    MSG_NOSIGNAL,
+                )
+            })?;
+            Ok(n as usize)
+        }
+    }
+
+    pub fn send_to(&self, buf: &[u8], addr: &SockAddr) -> io::Result<usize> {
+        unsafe {
+            let n = cvt({
+                libc::sendto(
+                    self.fd,
+                    buf.as_ptr() as *const c_void,
+                    cmp::min(buf.len(), max_len()),
+                    MSG_NOSIGNAL,
+                    addr.as_ptr(),
+                    addr.len(),
+                )
+            })?;
+            Ok(n as usize)
+        }
+    }
+
+    // ================================================
+
+    pub fn ttl(&self) -> io::Result<u32> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IP, libc::IP_TTL)?;
+            Ok(raw as u32)
+        }
+    }
+
+    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::IPPROTO_IP, libc::IP_TTL, ttl as c_int) }
+    }
+
+    pub fn unicast_hops_v6(&self) -> io::Result<u32> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IPV6, libc::IPV6_UNICAST_HOPS)?;
+            Ok(raw as u32)
+        }
+    }
+
+    pub fn set_unicast_hops_v6(&self, hops: u32) -> io::Result<()> {
+        unsafe {
+            self.setsockopt(
+                libc::IPPROTO_IPV6 as c_int,
+                libc::IPV6_UNICAST_HOPS,
+                hops as c_int,
+            )
+        }
+    }
+
+    pub fn only_v6(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IPV6, libc::IPV6_V6ONLY)?;
+            Ok(raw != 0)
+        }
+    }
+
+    pub fn set_only_v6(&self, only_v6: bool) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::IPPROTO_IPV6, libc::IPV6_V6ONLY, only_v6 as c_int) }
+    }
+
+    pub fn read_timeout(&self) -> io::Result<Option<Duration>> {
+        unsafe {
+            Ok(timeval2dur(
+                self.getsockopt(libc::SOL_SOCKET, libc::SO_RCVTIMEO)?,
+            ))
+        }
+    }
+
+    pub fn set_read_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::SOL_SOCKET, libc::SO_RCVTIMEO, dur2timeval(dur)?) }
+    }
+
+    pub fn write_timeout(&self) -> io::Result<Option<Duration>> {
+        unsafe {
+            Ok(timeval2dur(
+                self.getsockopt(libc::SOL_SOCKET, libc::SO_SNDTIMEO)?,
+            ))
+        }
+    }
+
+    pub fn set_write_timeout(&self, dur: Option<Duration>) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::SOL_SOCKET, libc::SO_SNDTIMEO, dur2timeval(dur)?) }
+    }
+
+    pub fn nodelay(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_TCP, libc::TCP_NODELAY)?;
+            Ok(raw != 0)
+        }
+    }
+
+    pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::IPPROTO_TCP, libc::TCP_NODELAY, nodelay as c_int) }
+    }
+
+    pub fn broadcast(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_BROADCAST)?;
+            Ok(raw != 0)
+        }
+    }
+
+    pub fn set_broadcast(&self, broadcast: bool) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::SOL_SOCKET, libc::SO_BROADCAST, broadcast as c_int) }
+    }
+
+    pub fn multicast_loop_v4(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IP, libc::IP_MULTICAST_LOOP)?;
+            Ok(raw != 0)
+        }
+    }
+
+    pub fn set_multicast_loop_v4(&self, multicast_loop_v4: bool) -> io::Result<()> {
+        unsafe {
+            self.setsockopt(
+                libc::IPPROTO_IP,
+                libc::IP_MULTICAST_LOOP,
+                multicast_loop_v4 as c_int,
+            )
+        }
+    }
+
+    pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IP, libc::IP_MULTICAST_TTL)?;
+            Ok(raw as u32)
+        }
+    }
+
+    pub fn set_multicast_ttl_v4(&self, multicast_ttl_v4: u32) -> io::Result<()> {
+        unsafe {
+            self.setsockopt(
+                libc::IPPROTO_IP,
+                libc::IP_MULTICAST_TTL,
+                multicast_ttl_v4 as c_int,
+            )
+        }
+    }
+
+    pub fn multicast_hops_v6(&self) -> io::Result<u32> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IPV6, libc::IPV6_MULTICAST_HOPS)?;
+            Ok(raw as u32)
+        }
+    }
+
+    pub fn set_multicast_hops_v6(&self, hops: u32) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::IPPROTO_IPV6, libc::IPV6_MULTICAST_HOPS, hops as c_int) }
+    }
+
+    pub fn multicast_if_v4(&self) -> io::Result<Ipv4Addr> {
+        unsafe {
+            let imr_interface: libc::in_addr =
+                self.getsockopt(libc::IPPROTO_IP, libc::IP_MULTICAST_IF)?;
+            Ok(from_s_addr(imr_interface.s_addr))
+        }
+    }
+
+    pub fn set_multicast_if_v4(&self, interface: &Ipv4Addr) -> io::Result<()> {
+        let interface = to_s_addr(interface);
+        let imr_interface = libc::in_addr { s_addr: interface };
+
+        unsafe { self.setsockopt(libc::IPPROTO_IP, libc::IP_MULTICAST_IF, imr_interface) }
+    }
+
+    pub fn multicast_if_v6(&self) -> io::Result<u32> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IPV6, libc::IPV6_MULTICAST_IF)?;
+            Ok(raw as u32)
+        }
+    }
+
+    pub fn set_multicast_if_v6(&self, interface: u32) -> io::Result<()> {
+        unsafe {
+            self.setsockopt(
+                libc::IPPROTO_IPV6,
+                libc::IPV6_MULTICAST_IF,
+                interface as c_int,
+            )
+        }
+    }
+
+    pub fn multicast_loop_v6(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::IPPROTO_IPV6, libc::IPV6_MULTICAST_LOOP)?;
+            Ok(raw != 0)
+        }
+    }
+
+    pub fn set_multicast_loop_v6(&self, multicast_loop_v6: bool) -> io::Result<()> {
+        unsafe {
+            self.setsockopt(
+                libc::IPPROTO_IPV6,
+                libc::IPV6_MULTICAST_LOOP,
+                multicast_loop_v6 as c_int,
+            )
+        }
+    }
+
+    pub fn join_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
+        let multiaddr = to_s_addr(multiaddr);
+        let interface = to_s_addr(interface);
+        let mreq = libc::ip_mreq {
+            imr_multiaddr: libc::in_addr { s_addr: multiaddr },
+            imr_interface: libc::in_addr { s_addr: interface },
+        };
+        unsafe { self.setsockopt(libc::IPPROTO_IP, libc::IP_ADD_MEMBERSHIP, mreq) }
+    }
+
+    pub fn join_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
+        let multiaddr = to_in6_addr(multiaddr);
+        let mreq = libc::ipv6_mreq {
+            ipv6mr_multiaddr: multiaddr,
+            ipv6mr_interface: to_ipv6mr_interface(interface),
+        };
+        unsafe { self.setsockopt(libc::IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, mreq) }
+    }
+
+    pub fn leave_multicast_v4(&self, multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> io::Result<()> {
+        let multiaddr = to_s_addr(multiaddr);
+        let interface = to_s_addr(interface);
+        let mreq = libc::ip_mreq {
+            imr_multiaddr: libc::in_addr { s_addr: multiaddr },
+            imr_interface: libc::in_addr { s_addr: interface },
+        };
+        unsafe { self.setsockopt(libc::IPPROTO_IP, libc::IP_DROP_MEMBERSHIP, mreq) }
+    }
+
+    pub fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
+        let multiaddr = to_in6_addr(multiaddr);
+        let mreq = libc::ipv6_mreq {
+            ipv6mr_multiaddr: multiaddr,
+            ipv6mr_interface: to_ipv6mr_interface(interface),
+        };
+        unsafe { self.setsockopt(libc::IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, mreq) }
+    }
+
+    pub fn linger(&self) -> io::Result<Option<Duration>> {
+        unsafe {
+            Ok(linger2dur(
+                self.getsockopt(libc::SOL_SOCKET, libc::SO_LINGER)?,
+            ))
+        }
+    }
+
+    pub fn set_linger(&self, dur: Option<Duration>) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::SOL_SOCKET, libc::SO_LINGER, dur2linger(dur)) }
+    }
+
+    pub fn set_reuse_address(&self, reuse: bool) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::SOL_SOCKET, libc::SO_REUSEADDR, reuse as c_int) }
+    }
+
+    pub fn reuse_address(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_REUSEADDR)?;
+            Ok(raw != 0)
+        }
+    }
+
+    pub fn recv_buffer_size(&self) -> io::Result<usize> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_RCVBUF)?;
+            Ok(raw as usize)
+        }
+    }
+
+    pub fn set_recv_buffer_size(&self, size: usize) -> io::Result<()> {
+        unsafe {
+            // TODO: casting usize to a c_int should be a checked cast
+            self.setsockopt(libc::SOL_SOCKET, libc::SO_RCVBUF, size as c_int)
+        }
+    }
+
+    pub fn send_buffer_size(&self) -> io::Result<usize> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_SNDBUF)?;
+            Ok(raw as usize)
+        }
+    }
+
+    pub fn set_send_buffer_size(&self, size: usize) -> io::Result<()> {
+        unsafe {
+            // TODO: casting usize to a c_int should be a checked cast
+            self.setsockopt(libc::SOL_SOCKET, libc::SO_SNDBUF, size as c_int)
+        }
+    }
+
+    pub fn keepalive(&self) -> io::Result<Option<Duration>> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_KEEPALIVE)?;
+            if raw == 0 {
+                return Ok(None);
+            }
+            let secs: c_int = self.getsockopt(libc::IPPROTO_TCP, KEEPALIVE_OPTION)?;
+            Ok(Some(Duration::new(secs as u64, 0)))
+        }
+    }
+
+    pub fn set_keepalive(&self, keepalive: Option<Duration>) -> io::Result<()> {
+        unsafe {
+            self.setsockopt(
+                libc::SOL_SOCKET,
+                libc::SO_KEEPALIVE,
+                keepalive.is_some() as c_int,
+            )?;
+            if let Some(dur) = keepalive {
+                // TODO: checked cast here
+                self.setsockopt(libc::IPPROTO_TCP, KEEPALIVE_OPTION, dur.as_secs() as c_int)?;
+            }
+            Ok(())
+        }
+    }
+
+    #[cfg(all(unix, feature = "reuseport"))]
+    pub fn reuse_port(&self) -> io::Result<bool> {
+        unsafe {
+            let raw: c_int = self.getsockopt(libc::SOL_SOCKET, libc::SO_REUSEPORT)?;
+            Ok(raw != 0)
+        }
+    }
+
+    #[cfg(all(unix, feature = "reuseport"))]
+    pub fn set_reuse_port(&self, reuse: bool) -> io::Result<()> {
+        unsafe { self.setsockopt(libc::SOL_SOCKET, libc::SO_REUSEPORT, reuse as c_int) }
+    }
+
+    unsafe fn setsockopt<T>(&self, opt: c_int, val: c_int, payload: T) -> io::Result<()>
+    where
+        T: Copy,
+    {
+        let payload = &payload as *const T as *const c_void;
+        cvt(libc::setsockopt(
+            self.fd,
+            opt,
+            val,
+            payload,
+            mem::size_of::<T>() as libc::socklen_t,
+        ))?;
+        Ok(())
+    }
+
+    unsafe fn getsockopt<T: Copy>(&self, opt: c_int, val: c_int) -> io::Result<T> {
+        let mut slot: T = mem::zeroed();
+        let mut len = mem::size_of::<T>() as libc::socklen_t;
+        cvt(libc::getsockopt(
+            self.fd,
+            opt,
+            val,
+            &mut slot as *mut _ as *mut _,
+            &mut len,
+        ))?;
+        assert_eq!(len as usize, mem::size_of::<T>());
+        Ok(slot)
+    }
+}
+
+impl Read for Socket {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        <&Socket>::read(&mut &*self, buf)
+    }
+}
+
+impl<'a> Read for &'a Socket {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        unsafe {
+            let n = cvt({
+                libc::read(
+                    self.fd,
+                    buf.as_mut_ptr() as *mut c_void,
+                    cmp::min(buf.len(), max_len()),
+                )
+            })?;
+            Ok(n as usize)
+        }
+    }
+}
+
+impl Write for Socket {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        <&Socket>::write(&mut &*self, buf)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        <&Socket>::flush(&mut &*self)
+    }
+}
+
+impl<'a> Write for &'a Socket {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.send(buf)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl fmt::Debug for Socket {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let mut f = f.debug_struct("Socket");
+        f.field("fd", &self.fd);
+        if let Ok(addr) = self.local_addr() {
+            f.field("local_addr", &addr);
+        }
+        if let Ok(addr) = self.peer_addr() {
+            f.field("peer_addr", &addr);
+        }
+        f.finish()
+    }
+}
+
+impl AsRawFd for Socket {
+    fn as_raw_fd(&self) -> c_int {
+        self.fd
+    }
+}
+
+impl IntoRawFd for Socket {
+    fn into_raw_fd(self) -> c_int {
+        let fd = self.fd;
+        mem::forget(self);
+        return fd;
+    }
+}
+
+impl FromRawFd for Socket {
+    unsafe fn from_raw_fd(fd: c_int) -> Socket {
+        Socket { fd: fd }
+    }
+}
+
+impl AsRawFd for crate::Socket {
+    fn as_raw_fd(&self) -> c_int {
+        self.inner.as_raw_fd()
+    }
+}
+
+impl IntoRawFd for crate::Socket {
+    fn into_raw_fd(self) -> c_int {
+        self.inner.into_raw_fd()
+    }
+}
+
+impl FromRawFd for crate::Socket {
+    unsafe fn from_raw_fd(fd: c_int) -> crate::Socket {
+        crate::Socket {
+            inner: Socket::from_raw_fd(fd),
+        }
+    }
+}
+
+impl Drop for Socket {
+    fn drop(&mut self) {
+        unsafe {
+            let _ = libc::close(self.fd);
+        }
+    }
+}
+
+impl From<Socket> for net::TcpStream {
+    fn from(socket: Socket) -> net::TcpStream {
+        unsafe { net::TcpStream::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+impl From<Socket> for net::TcpListener {
+    fn from(socket: Socket) -> net::TcpListener {
+        unsafe { net::TcpListener::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+impl From<Socket> for net::UdpSocket {
+    fn from(socket: Socket) -> net::UdpSocket {
+        unsafe { net::UdpSocket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+#[cfg(all(unix, feature = "unix"))]
+impl From<Socket> for UnixStream {
+    fn from(socket: Socket) -> UnixStream {
+        unsafe { UnixStream::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+#[cfg(all(unix, feature = "unix"))]
+impl From<Socket> for UnixListener {
+    fn from(socket: Socket) -> UnixListener {
+        unsafe { UnixListener::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+#[cfg(all(unix, feature = "unix"))]
+impl From<Socket> for UnixDatagram {
+    fn from(socket: Socket) -> UnixDatagram {
+        unsafe { UnixDatagram::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+impl From<net::TcpStream> for Socket {
+    fn from(socket: net::TcpStream) -> Socket {
+        unsafe { Socket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+impl From<net::TcpListener> for Socket {
+    fn from(socket: net::TcpListener) -> Socket {
+        unsafe { Socket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+impl From<net::UdpSocket> for Socket {
+    fn from(socket: net::UdpSocket) -> Socket {
+        unsafe { Socket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+#[cfg(all(unix, feature = "unix"))]
+impl From<UnixStream> for Socket {
+    fn from(socket: UnixStream) -> Socket {
+        unsafe { Socket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+#[cfg(all(unix, feature = "unix"))]
+impl From<UnixListener> for Socket {
+    fn from(socket: UnixListener) -> Socket {
+        unsafe { Socket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+#[cfg(all(unix, feature = "unix"))]
+impl From<UnixDatagram> for Socket {
+    fn from(socket: UnixDatagram) -> Socket {
+        unsafe { Socket::from_raw_fd(socket.into_raw_fd()) }
+    }
+}
+
+fn max_len() -> usize {
+    // The maximum read limit on most posix-like systems is `SSIZE_MAX`,
+    // with the man page quoting that if the count of bytes to read is
+    // greater than `SSIZE_MAX` the result is "unspecified".
+    //
+    // On macOS, however, apparently the 64-bit libc is either buggy or
+    // intentionally showing odd behavior by rejecting any read with a size
+    // larger than or equal to INT_MAX. To handle both of these the read
+    // size is capped on both platforms.
+    if cfg!(target_os = "macos") {
+        <c_int>::max_value() as usize - 1
+    } else {
+        <ssize_t>::max_value() as usize
+    }
+}
+
+fn cvt<T: One + PartialEq + Neg<Output = T>>(t: T) -> io::Result<T> {
+    let one: T = T::one();
+    if t == -one {
+        Err(io::Error::last_os_error())
+    } else {
+        Ok(t)
+    }
+}
+
+fn cvt_r<F, T>(mut f: F) -> io::Result<T>
+where
+    F: FnMut() -> T,
+    T: One + PartialEq + Neg<Output = T>,
+{
+    loop {
+        match cvt(f()) {
+            Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
+            other => return other,
+        }
+    }
+}
+
+fn set_cloexec(fd: c_int) -> io::Result<()> {
+    unsafe {
+        let previous = cvt(libc::fcntl(fd, libc::F_GETFD))?;
+        let new = previous | libc::FD_CLOEXEC;
+        if new != previous {
+            cvt(libc::fcntl(fd, libc::F_SETFD, new))?;
+        }
+        Ok(())
+    }
+}
+
+fn dur2timeval(dur: Option<Duration>) -> io::Result<libc::timeval> {
+    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;
+            }
+            Ok(timeout)
+        }
+        None => Ok(libc::timeval {
+            tv_sec: 0,
+            tv_usec: 0,
+        }),
+    }
+}
+
+fn timeval2dur(raw: libc::timeval) -> Option<Duration> {
+    if raw.tv_sec == 0 && raw.tv_usec == 0 {
+        None
+    } else {
+        let sec = raw.tv_sec as u64;
+        let nsec = (raw.tv_usec as u32) * 1000;
+        Some(Duration::new(sec, nsec))
+    }
+}
+
+fn to_s_addr(addr: &Ipv4Addr) -> libc::in_addr_t {
+    let octets = addr.octets();
+    crate::hton(
+        ((octets[0] as libc::in_addr_t) << 24)
+            | ((octets[1] as libc::in_addr_t) << 16)
+            | ((octets[2] as libc::in_addr_t) << 8)
+            | ((octets[3] as libc::in_addr_t) << 0),
+    )
+}
+
+fn from_s_addr(in_addr: libc::in_addr_t) -> Ipv4Addr {
+    let h_addr = crate::ntoh(in_addr);
+
+    let a: u8 = (h_addr >> 24) as u8;
+    let b: u8 = (h_addr >> 16) as u8;
+    let c: u8 = (h_addr >> 8) as u8;
+    let d: u8 = (h_addr >> 0) as u8;
+
+    Ipv4Addr::new(a, b, c, d)
+}
+
+fn to_in6_addr(addr: &Ipv6Addr) -> libc::in6_addr {
+    let mut ret: libc::in6_addr = unsafe { mem::zeroed() };
+    ret.s6_addr = addr.octets();
+    return ret;
+}
+
+#[cfg(target_os = "android")]
+fn to_ipv6mr_interface(value: u32) -> c_int {
+    value as c_int
+}
+
+#[cfg(not(target_os = "android"))]
+fn to_ipv6mr_interface(value: u32) -> libc::c_uint {
+    value as libc::c_uint
+}
+
+fn linger2dur(linger_opt: libc::linger) -> Option<Duration> {
+    if linger_opt.l_onoff == 0 {
+        None
+    } else {
+        Some(Duration::from_secs(linger_opt.l_linger as u64))
+    }
+}
+
+fn dur2linger(dur: Option<Duration>) -> libc::linger {
+    match dur {
+        Some(d) => libc::linger {
+            l_onoff: 1,
+            l_linger: d.as_secs() as c_int,
+        },
+        None => libc::linger {
+            l_onoff: 0,
+            l_linger: 0,
+        },
+    }
+}
+
+#[test]
+fn test_ip() {
+    let ip = Ipv4Addr::new(127, 0, 0, 1);
+    assert_eq!(ip, from_s_addr(to_s_addr(&ip)));
+}