diff options
Diffstat (limited to 'third_party/rust/socket2/src/sys/unix.rs')
| -rw-r--r-- | third_party/rust/socket2/src/sys/unix.rs | 2101 |
1 files changed, 2101 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..74da8cc208 --- /dev/null +++ b/third_party/rust/socket2/src/sys/unix.rs @@ -0,0 +1,2101 @@ +// Copyright 2015 The Rust Project Developers. +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +use std::cmp::min; +#[cfg(not(target_os = "redox"))] +use std::io::IoSlice; +use std::marker::PhantomData; +use std::mem::{self, size_of, MaybeUninit}; +use std::net::Shutdown; +use std::net::{Ipv4Addr, Ipv6Addr}; +#[cfg(all(feature = "all", target_vendor = "apple"))] +use std::num::NonZeroU32; +#[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "linux", + target_vendor = "apple", + ) +))] +use std::num::NonZeroUsize; +#[cfg(feature = "all")] +use std::os::unix::ffi::OsStrExt; +#[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "linux", + target_vendor = "apple", + ) +))] +use std::os::unix::io::RawFd; +use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd}; +#[cfg(feature = "all")] +use std::os::unix::net::{UnixDatagram, UnixListener, UnixStream}; +#[cfg(feature = "all")] +use std::path::Path; +#[cfg(not(all(target_os = "redox", not(feature = "all"))))] +use std::ptr; +use std::time::{Duration, Instant}; +use std::{io, slice}; + +#[cfg(not(target_vendor = "apple"))] +use libc::ssize_t; +use libc::{c_void, in6_addr, in_addr}; + +#[cfg(not(target_os = "redox"))] +use crate::RecvFlags; +use crate::{Domain, Protocol, SockAddr, TcpKeepalive, Type}; + +pub(crate) use libc::c_int; + +// Used in `Domain`. +pub(crate) use libc::{AF_INET, AF_INET6}; +// Used in `Type`. +#[cfg(all(feature = "all", not(target_os = "redox")))] +pub(crate) use libc::SOCK_RAW; +#[cfg(feature = "all")] +pub(crate) use libc::SOCK_SEQPACKET; +pub(crate) use libc::{SOCK_DGRAM, SOCK_STREAM}; +// Used in `Protocol`. +pub(crate) use libc::{IPPROTO_ICMP, IPPROTO_ICMPV6, IPPROTO_TCP, IPPROTO_UDP}; +// Used in `SockAddr`. +pub(crate) use libc::{ + sa_family_t, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_storage, socklen_t, +}; +// Used in `RecvFlags`. +#[cfg(not(target_os = "redox"))] +pub(crate) use libc::{MSG_TRUNC, SO_OOBINLINE}; +// Used in `Socket`. +#[cfg(not(target_os = "nto"))] +pub(crate) use libc::ipv6_mreq as Ipv6Mreq; +#[cfg(all(feature = "all", not(target_os = "redox")))] +pub(crate) use libc::IP_HDRINCL; +#[cfg(not(any( + target_os = "dragonfly", + target_os = "fuchsia", + target_os = "illumos", + target_os = "netbsd", + target_os = "openbsd", + target_os = "redox", + target_os = "solaris", + target_os = "haiku", + target_os = "nto", +)))] +pub(crate) use libc::IP_RECVTOS; +#[cfg(not(any( + target_os = "fuchsia", + target_os = "redox", + target_os = "solaris", + target_os = "illumos", +)))] +pub(crate) use libc::IP_TOS; +#[cfg(not(target_vendor = "apple"))] +pub(crate) use libc::SO_LINGER; +#[cfg(target_vendor = "apple")] +pub(crate) use libc::SO_LINGER_SEC as SO_LINGER; +pub(crate) use libc::{ + ip_mreq as IpMreq, linger, IPPROTO_IP, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, IPV6_MULTICAST_IF, + IPV6_MULTICAST_LOOP, IPV6_UNICAST_HOPS, IPV6_V6ONLY, IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP, + IP_MULTICAST_IF, IP_MULTICAST_LOOP, IP_MULTICAST_TTL, IP_TTL, MSG_OOB, MSG_PEEK, SOL_SOCKET, + SO_BROADCAST, SO_ERROR, SO_KEEPALIVE, SO_RCVBUF, SO_RCVTIMEO, SO_REUSEADDR, SO_SNDBUF, + SO_SNDTIMEO, SO_TYPE, TCP_NODELAY, +}; +#[cfg(not(any( + target_os = "dragonfly", + target_os = "haiku", + target_os = "netbsd", + target_os = "openbsd", + target_os = "redox", + target_os = "fuchsia", + target_os = "nto", +)))] +pub(crate) use libc::{ + ip_mreq_source as IpMreqSource, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_SOURCE_MEMBERSHIP, +}; +#[cfg(not(any( + target_os = "dragonfly", + target_os = "freebsd", + target_os = "haiku", + target_os = "illumos", + target_os = "netbsd", + target_os = "openbsd", + target_os = "solaris", + target_os = "nto", + target_vendor = "apple" +)))] +pub(crate) use libc::{IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP}; +#[cfg(any( + target_os = "dragonfly", + target_os = "freebsd", + target_os = "haiku", + target_os = "illumos", + target_os = "netbsd", + target_os = "openbsd", + target_os = "solaris", + target_vendor = "apple", +))] +pub(crate) use libc::{ + IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP, IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP, +}; +#[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_vendor = "apple", + ) +))] +pub(crate) use libc::{TCP_KEEPCNT, TCP_KEEPINTVL}; + +// See this type in the Windows file. +pub(crate) type Bool = c_int; + +#[cfg(any(target_vendor = "apple", target_os = "nto"))] +use libc::TCP_KEEPALIVE as KEEPALIVE_TIME; +#[cfg(not(any( + target_vendor = "apple", + target_os = "haiku", + target_os = "openbsd", + target_os = "nto", +)))] +use libc::TCP_KEEPIDLE as KEEPALIVE_TIME; + +/// Helper macro to execute a system call that returns an `io::Result`. +macro_rules! syscall { + ($fn: ident ( $($arg: expr),* $(,)* ) ) => {{ + #[allow(unused_unsafe)] + let res = unsafe { libc::$fn($($arg, )*) }; + if res == -1 { + Err(std::io::Error::last_os_error()) + } else { + Ok(res) + } + }}; +} + +/// Maximum size of a buffer passed to system call like `recv` and `send`. +#[cfg(not(target_vendor = "apple"))] +const MAX_BUF_LEN: usize = <ssize_t>::max_value() as 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. +#[cfg(target_vendor = "apple")] +const MAX_BUF_LEN: usize = <c_int>::max_value() as usize - 1; + +#[cfg(any( + all( + target_os = "linux", + any( + target_env = "gnu", + all(target_env = "uclibc", target_pointer_width = "64") + ) + ), + target_os = "android", +))] +type IovLen = usize; + +#[cfg(any( + all( + target_os = "linux", + any( + target_env = "musl", + all(target_env = "uclibc", target_pointer_width = "32") + ) + ), + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "haiku", + target_os = "illumos", + target_os = "netbsd", + target_os = "openbsd", + target_os = "solaris", + target_os = "nto", + target_vendor = "apple", +))] +type IovLen = c_int; + +/// Unix only API. +impl Domain { + /// Domain for Unix socket communication, corresponding to `AF_UNIX`. + #[cfg_attr(docsrs, doc(cfg(unix)))] + pub const UNIX: Domain = Domain(libc::AF_UNIX); + + /// Domain for low-level packet interface, corresponding to `AF_PACKET`. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub const PACKET: Domain = Domain(libc::AF_PACKET); + + /// Domain for low-level VSOCK interface, corresponding to `AF_VSOCK`. + #[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))) + )] + pub const VSOCK: Domain = Domain(libc::AF_VSOCK); +} + +impl_debug!( + Domain, + libc::AF_INET, + libc::AF_INET6, + libc::AF_UNIX, + #[cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))] + #[cfg_attr( + docsrs, + doc(cfg(any(target_os = "android", target_os = "fuchsia", target_os = "linux"))) + )] + libc::AF_PACKET, + #[cfg(any(target_os = "android", target_os = "linux"))] + #[cfg_attr(docsrs, doc(cfg(any(target_os = "android", target_os = "linux"))))] + libc::AF_VSOCK, + libc::AF_UNSPEC, // = 0. +); + +/// Unix only API. +impl Type { + /// Set `SOCK_NONBLOCK` on the `Type`. + #[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ) + ))) + )] + pub const fn nonblocking(self) -> Type { + Type(self.0 | libc::SOCK_NONBLOCK) + } + + /// Set `SOCK_CLOEXEC` on the `Type`. + #[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ) + ))) + )] + pub const fn cloexec(self) -> Type { + self._cloexec() + } + + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ))] + pub(crate) const fn _cloexec(self) -> Type { + Type(self.0 | libc::SOCK_CLOEXEC) + } +} + +impl_debug!( + Type, + libc::SOCK_STREAM, + libc::SOCK_DGRAM, + #[cfg(not(target_os = "redox"))] + libc::SOCK_RAW, + #[cfg(not(any(target_os = "redox", target_os = "haiku")))] + libc::SOCK_RDM, + libc::SOCK_SEQPACKET, + /* TODO: add these optional bit OR-ed flags: + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ))] + libc::SOCK_NONBLOCK, + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ))] + libc::SOCK_CLOEXEC, + */ +); + +impl_debug!( + Protocol, + libc::IPPROTO_ICMP, + libc::IPPROTO_ICMPV6, + libc::IPPROTO_TCP, + libc::IPPROTO_UDP, +); + +/// Unix-only API. +#[cfg(not(target_os = "redox"))] +impl RecvFlags { + /// Check if the message terminates a record. + /// + /// Not all socket types support the notion of records. + /// For socket types that do support it (such as [`SEQPACKET`][Type::SEQPACKET]), + /// a record is terminated by sending a message with the end-of-record flag set. + /// + /// On Unix this corresponds to the MSG_EOR flag. + pub const fn is_end_of_record(self) -> bool { + self.0 & libc::MSG_EOR != 0 + } + + /// Check if the message contains out-of-band data. + /// + /// This is useful for protocols where you receive out-of-band data + /// mixed in with the normal data stream. + /// + /// On Unix this corresponds to the MSG_OOB flag. + pub const fn is_out_of_band(self) -> bool { + self.0 & libc::MSG_OOB != 0 + } +} + +#[cfg(not(target_os = "redox"))] +impl std::fmt::Debug for RecvFlags { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + f.debug_struct("RecvFlags") + .field("is_end_of_record", &self.is_end_of_record()) + .field("is_out_of_band", &self.is_out_of_band()) + .field("is_truncated", &self.is_truncated()) + .finish() + } +} + +#[repr(transparent)] +pub struct MaybeUninitSlice<'a> { + vec: libc::iovec, + _lifetime: PhantomData<&'a mut [MaybeUninit<u8>]>, +} + +unsafe impl<'a> Send for MaybeUninitSlice<'a> {} + +unsafe impl<'a> Sync for MaybeUninitSlice<'a> {} + +impl<'a> MaybeUninitSlice<'a> { + pub(crate) fn new(buf: &'a mut [MaybeUninit<u8>]) -> MaybeUninitSlice<'a> { + MaybeUninitSlice { + vec: libc::iovec { + iov_base: buf.as_mut_ptr().cast(), + iov_len: buf.len(), + }, + _lifetime: PhantomData, + } + } + + pub(crate) fn as_slice(&self) -> &[MaybeUninit<u8>] { + unsafe { slice::from_raw_parts(self.vec.iov_base.cast(), self.vec.iov_len) } + } + + pub(crate) fn as_mut_slice(&mut self) -> &mut [MaybeUninit<u8>] { + unsafe { slice::from_raw_parts_mut(self.vec.iov_base.cast(), self.vec.iov_len) } + } +} + +/// Unix only API. +impl SockAddr { + /// Constructs a `SockAddr` with the family `AF_UNIX` and the provided path. + /// + /// # Failure + /// + /// Returns an error if the path is longer than `SUN_LEN`. + #[cfg(feature = "all")] + #[cfg_attr(docsrs, doc(cfg(all(unix, feature = "all"))))] + #[allow(unused_unsafe)] // TODO: replace with `unsafe_op_in_unsafe_fn` once stable. + pub fn unix<P>(path: P) -> io::Result<SockAddr> + where + P: AsRef<Path>, + { + unsafe { + SockAddr::init(|storage, len| { + // Safety: `SockAddr::init` zeros the address, which is a valid + // representation. + let storage: &mut libc::sockaddr_un = unsafe { &mut *storage.cast() }; + let len: &mut socklen_t = unsafe { &mut *len }; + + let bytes = path.as_ref().as_os_str().as_bytes(); + let too_long = match bytes.first() { + None => false, + // linux abstract namespaces aren't null-terminated + Some(&0) => bytes.len() > storage.sun_path.len(), + Some(_) => bytes.len() >= storage.sun_path.len(), + }; + if too_long { + return Err(io::Error::new( + io::ErrorKind::InvalidInput, + "path must be shorter than SUN_LEN", + )); + } + + storage.sun_family = libc::AF_UNIX as sa_family_t; + // Safety: `bytes` and `addr.sun_path` are not overlapping and + // both point to valid memory. + // `SockAddr::init` zeroes the memory, so the path is already + // null terminated. + unsafe { + ptr::copy_nonoverlapping( + bytes.as_ptr(), + storage.sun_path.as_mut_ptr() as *mut u8, + bytes.len(), + ) + }; + + let base = storage as *const _ as usize; + let path = &storage.sun_path as *const _ as usize; + let sun_path_offset = path - base; + let length = sun_path_offset + + bytes.len() + + match bytes.first() { + Some(&0) | None => 0, + Some(_) => 1, + }; + *len = length as socklen_t; + + Ok(()) + }) + } + .map(|(_, addr)| addr) + } +} + +impl SockAddr { + /// Constructs a `SockAddr` with the family `AF_VSOCK` and the provided CID/port. + /// + /// # Errors + /// + /// This function can never fail. In a future version of this library it will be made + /// infallible. + #[allow(unused_unsafe)] // TODO: replace with `unsafe_op_in_unsafe_fn` once stable. + #[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))) + )] + pub fn vsock(cid: u32, port: u32) -> io::Result<SockAddr> { + unsafe { + SockAddr::init(|storage, len| { + // Safety: `SockAddr::init` zeros the address, which is a valid + // representation. + let storage: &mut libc::sockaddr_vm = unsafe { &mut *storage.cast() }; + let len: &mut socklen_t = unsafe { &mut *len }; + + storage.svm_family = libc::AF_VSOCK as sa_family_t; + storage.svm_cid = cid; + storage.svm_port = port; + + *len = mem::size_of::<libc::sockaddr_vm>() as socklen_t; + + Ok(()) + }) + } + .map(|(_, addr)| addr) + } + + /// Returns this address VSOCK CID/port if it is in the `AF_VSOCK` family, + /// otherwise return `None`. + #[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))) + )] + pub fn vsock_address(&self) -> Option<(u32, u32)> { + if self.family() == libc::AF_VSOCK as sa_family_t { + // Safety: if the ss_family field is AF_VSOCK then storage must be a sockaddr_vm. + let addr = unsafe { &*(self.as_ptr() as *const libc::sockaddr_vm) }; + Some((addr.svm_cid, addr.svm_port)) + } else { + None + } + } +} + +pub(crate) type Socket = c_int; + +pub(crate) unsafe fn socket_from_raw(socket: Socket) -> crate::socket::Inner { + crate::socket::Inner::from_raw_fd(socket) +} + +pub(crate) fn socket_as_raw(socket: &crate::socket::Inner) -> Socket { + socket.as_raw_fd() +} + +pub(crate) fn socket_into_raw(socket: crate::socket::Inner) -> Socket { + socket.into_raw_fd() +} + +pub(crate) fn socket(family: c_int, ty: c_int, protocol: c_int) -> io::Result<Socket> { + syscall!(socket(family, ty, protocol)) +} + +#[cfg(feature = "all")] +pub(crate) fn socketpair(family: c_int, ty: c_int, protocol: c_int) -> io::Result<[Socket; 2]> { + let mut fds = [0, 0]; + syscall!(socketpair(family, ty, protocol, fds.as_mut_ptr())).map(|_| fds) +} + +pub(crate) fn bind(fd: Socket, addr: &SockAddr) -> io::Result<()> { + syscall!(bind(fd, addr.as_ptr(), addr.len() as _)).map(|_| ()) +} + +pub(crate) fn connect(fd: Socket, addr: &SockAddr) -> io::Result<()> { + syscall!(connect(fd, addr.as_ptr(), addr.len())).map(|_| ()) +} + +pub(crate) fn poll_connect(socket: &crate::Socket, timeout: Duration) -> io::Result<()> { + let start = Instant::now(); + + let mut pollfd = libc::pollfd { + fd: socket.as_raw(), + events: libc::POLLIN | libc::POLLOUT, + revents: 0, + }; + + loop { + let elapsed = start.elapsed(); + if elapsed >= timeout { + return Err(io::ErrorKind::TimedOut.into()); + } + + let timeout = (timeout - elapsed).as_millis(); + let timeout = clamp(timeout, 1, c_int::max_value() as u128) as c_int; + + match syscall!(poll(&mut pollfd, 1, timeout)) { + Ok(0) => return Err(io::ErrorKind::TimedOut.into()), + Ok(_) => { + // Error or hang up indicates an error (or failure to connect). + if (pollfd.revents & libc::POLLHUP) != 0 || (pollfd.revents & libc::POLLERR) != 0 { + match socket.take_error() { + Ok(Some(err)) => return Err(err), + Ok(None) => { + return Err(io::Error::new( + io::ErrorKind::Other, + "no error set after POLLHUP", + )) + } + Err(err) => return Err(err), + } + } + return Ok(()); + } + // Got interrupted, try again. + Err(ref err) if err.kind() == io::ErrorKind::Interrupted => continue, + Err(err) => return Err(err), + } + } +} + +// TODO: use clamp from std lib, stable since 1.50. +fn clamp<T>(value: T, min: T, max: T) -> T +where + T: Ord, +{ + if value <= min { + min + } else if value >= max { + max + } else { + value + } +} + +pub(crate) fn listen(fd: Socket, backlog: c_int) -> io::Result<()> { + syscall!(listen(fd, backlog)).map(|_| ()) +} + +pub(crate) fn accept(fd: Socket) -> io::Result<(Socket, SockAddr)> { + // Safety: `accept` initialises the `SockAddr` for us. + unsafe { SockAddr::init(|storage, len| syscall!(accept(fd, storage.cast(), len))) } +} + +pub(crate) fn getsockname(fd: Socket) -> io::Result<SockAddr> { + // Safety: `accept` initialises the `SockAddr` for us. + unsafe { SockAddr::init(|storage, len| syscall!(getsockname(fd, storage.cast(), len))) } + .map(|(_, addr)| addr) +} + +pub(crate) fn getpeername(fd: Socket) -> io::Result<SockAddr> { + // Safety: `accept` initialises the `SockAddr` for us. + unsafe { SockAddr::init(|storage, len| syscall!(getpeername(fd, storage.cast(), len))) } + .map(|(_, addr)| addr) +} + +pub(crate) fn try_clone(fd: Socket) -> io::Result<Socket> { + syscall!(fcntl(fd, libc::F_DUPFD_CLOEXEC, 0)) +} + +pub(crate) fn set_nonblocking(fd: Socket, nonblocking: bool) -> io::Result<()> { + if nonblocking { + fcntl_add(fd, libc::F_GETFL, libc::F_SETFL, libc::O_NONBLOCK) + } else { + fcntl_remove(fd, libc::F_GETFL, libc::F_SETFL, libc::O_NONBLOCK) + } +} + +pub(crate) fn shutdown(fd: Socket, how: Shutdown) -> io::Result<()> { + let how = match how { + Shutdown::Write => libc::SHUT_WR, + Shutdown::Read => libc::SHUT_RD, + Shutdown::Both => libc::SHUT_RDWR, + }; + syscall!(shutdown(fd, how)).map(|_| ()) +} + +pub(crate) fn recv(fd: Socket, buf: &mut [MaybeUninit<u8>], flags: c_int) -> io::Result<usize> { + syscall!(recv( + fd, + buf.as_mut_ptr().cast(), + min(buf.len(), MAX_BUF_LEN), + flags, + )) + .map(|n| n as usize) +} + +pub(crate) fn recv_from( + fd: Socket, + buf: &mut [MaybeUninit<u8>], + flags: c_int, +) -> io::Result<(usize, SockAddr)> { + // Safety: `recvfrom` initialises the `SockAddr` for us. + unsafe { + SockAddr::init(|addr, addrlen| { + syscall!(recvfrom( + fd, + buf.as_mut_ptr().cast(), + min(buf.len(), MAX_BUF_LEN), + flags, + addr.cast(), + addrlen + )) + .map(|n| n as usize) + }) + } +} + +pub(crate) fn peek_sender(fd: Socket) -> io::Result<SockAddr> { + // Unix-like platforms simply truncate the returned data, so this implementation is trivial. + // However, for Windows this requires suppressing the `WSAEMSGSIZE` error, + // so that requires a different approach. + // NOTE: macOS does not populate `sockaddr` if you pass a zero-sized buffer. + let (_, sender) = recv_from(fd, &mut [MaybeUninit::uninit(); 8], MSG_PEEK)?; + Ok(sender) +} + +#[cfg(not(target_os = "redox"))] +pub(crate) fn recv_vectored( + fd: Socket, + bufs: &mut [crate::MaybeUninitSlice<'_>], + flags: c_int, +) -> io::Result<(usize, RecvFlags)> { + recvmsg(fd, ptr::null_mut(), bufs, flags).map(|(n, _, recv_flags)| (n, recv_flags)) +} + +#[cfg(not(target_os = "redox"))] +pub(crate) fn recv_from_vectored( + fd: Socket, + bufs: &mut [crate::MaybeUninitSlice<'_>], + flags: c_int, +) -> io::Result<(usize, RecvFlags, SockAddr)> { + // Safety: `recvmsg` initialises the address storage and we set the length + // manually. + unsafe { + SockAddr::init(|storage, len| { + recvmsg(fd, storage, bufs, flags).map(|(n, addrlen, recv_flags)| { + // Set the correct address length. + *len = addrlen; + (n, recv_flags) + }) + }) + } + .map(|((n, recv_flags), addr)| (n, recv_flags, addr)) +} + +/// Returns the (bytes received, sending address len, `RecvFlags`). +#[cfg(not(target_os = "redox"))] +fn recvmsg( + fd: Socket, + msg_name: *mut sockaddr_storage, + bufs: &mut [crate::MaybeUninitSlice<'_>], + flags: c_int, +) -> io::Result<(usize, libc::socklen_t, RecvFlags)> { + let msg_namelen = if msg_name.is_null() { + 0 + } else { + size_of::<sockaddr_storage>() as libc::socklen_t + }; + // libc::msghdr contains unexported padding fields on Fuchsia. + let mut msg: libc::msghdr = unsafe { mem::zeroed() }; + msg.msg_name = msg_name.cast(); + msg.msg_namelen = msg_namelen; + msg.msg_iov = bufs.as_mut_ptr().cast(); + msg.msg_iovlen = min(bufs.len(), IovLen::MAX as usize) as IovLen; + syscall!(recvmsg(fd, &mut msg, flags)) + .map(|n| (n as usize, msg.msg_namelen, RecvFlags(msg.msg_flags))) +} + +pub(crate) fn send(fd: Socket, buf: &[u8], flags: c_int) -> io::Result<usize> { + syscall!(send( + fd, + buf.as_ptr().cast(), + min(buf.len(), MAX_BUF_LEN), + flags, + )) + .map(|n| n as usize) +} + +#[cfg(not(target_os = "redox"))] +pub(crate) fn send_vectored(fd: Socket, bufs: &[IoSlice<'_>], flags: c_int) -> io::Result<usize> { + sendmsg(fd, ptr::null(), 0, bufs, flags) +} + +pub(crate) fn send_to(fd: Socket, buf: &[u8], addr: &SockAddr, flags: c_int) -> io::Result<usize> { + syscall!(sendto( + fd, + buf.as_ptr().cast(), + min(buf.len(), MAX_BUF_LEN), + flags, + addr.as_ptr(), + addr.len(), + )) + .map(|n| n as usize) +} + +#[cfg(not(target_os = "redox"))] +pub(crate) fn send_to_vectored( + fd: Socket, + bufs: &[IoSlice<'_>], + addr: &SockAddr, + flags: c_int, +) -> io::Result<usize> { + sendmsg(fd, addr.as_storage_ptr(), addr.len(), bufs, flags) +} + +/// Returns the (bytes received, sending address len, `RecvFlags`). +#[cfg(not(target_os = "redox"))] +fn sendmsg( + fd: Socket, + msg_name: *const sockaddr_storage, + msg_namelen: socklen_t, + bufs: &[IoSlice<'_>], + flags: c_int, +) -> io::Result<usize> { + // libc::msghdr contains unexported padding fields on Fuchsia. + let mut msg: libc::msghdr = unsafe { mem::zeroed() }; + // Safety: we're creating a `*mut` pointer from a reference, which is UB + // once actually used. However the OS should not write to it in the + // `sendmsg` system call. + msg.msg_name = (msg_name as *mut sockaddr_storage).cast(); + msg.msg_namelen = msg_namelen; + // Safety: Same as above about `*const` -> `*mut`. + msg.msg_iov = bufs.as_ptr() as *mut _; + msg.msg_iovlen = min(bufs.len(), IovLen::MAX as usize) as IovLen; + syscall!(sendmsg(fd, &msg, flags)).map(|n| n as usize) +} + +/// Wrapper around `getsockopt` to deal with platform specific timeouts. +pub(crate) fn timeout_opt(fd: Socket, opt: c_int, val: c_int) -> io::Result<Option<Duration>> { + unsafe { getsockopt(fd, opt, val).map(from_timeval) } +} + +fn from_timeval(duration: libc::timeval) -> Option<Duration> { + if duration.tv_sec == 0 && duration.tv_usec == 0 { + None + } else { + let sec = duration.tv_sec as u64; + let nsec = (duration.tv_usec as u32) * 1000; + Some(Duration::new(sec, nsec)) + } +} + +/// Wrapper around `setsockopt` to deal with platform specific timeouts. +pub(crate) fn set_timeout_opt( + fd: Socket, + opt: c_int, + val: c_int, + duration: Option<Duration>, +) -> io::Result<()> { + let duration = into_timeval(duration); + unsafe { setsockopt(fd, opt, val, duration) } +} + +fn into_timeval(duration: Option<Duration>) -> libc::timeval { + match duration { + // https://github.com/rust-lang/libc/issues/1848 + #[cfg_attr(target_env = "musl", allow(deprecated))] + Some(duration) => libc::timeval { + tv_sec: min(duration.as_secs(), libc::time_t::max_value() as u64) as libc::time_t, + tv_usec: duration.subsec_micros() as libc::suseconds_t, + }, + None => libc::timeval { + tv_sec: 0, + tv_usec: 0, + }, + } +} + +#[cfg(feature = "all")] +#[cfg(not(any(target_os = "haiku", target_os = "openbsd")))] +pub(crate) fn keepalive_time(fd: Socket) -> io::Result<Duration> { + unsafe { + getsockopt::<c_int>(fd, IPPROTO_TCP, KEEPALIVE_TIME) + .map(|secs| Duration::from_secs(secs as u64)) + } +} + +#[allow(unused_variables)] +pub(crate) fn set_tcp_keepalive(fd: Socket, keepalive: &TcpKeepalive) -> io::Result<()> { + #[cfg(not(any(target_os = "haiku", target_os = "openbsd", target_os = "nto")))] + if let Some(time) = keepalive.time { + let secs = into_secs(time); + unsafe { setsockopt(fd, libc::IPPROTO_TCP, KEEPALIVE_TIME, secs)? } + } + + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_vendor = "apple", + ))] + { + if let Some(interval) = keepalive.interval { + let secs = into_secs(interval); + unsafe { setsockopt(fd, libc::IPPROTO_TCP, libc::TCP_KEEPINTVL, secs)? } + } + + if let Some(retries) = keepalive.retries { + unsafe { setsockopt(fd, libc::IPPROTO_TCP, libc::TCP_KEEPCNT, retries as c_int)? } + } + } + + #[cfg(target_os = "nto")] + if let Some(time) = keepalive.time { + let secs = into_timeval(Some(time)); + unsafe { setsockopt(fd, libc::IPPROTO_TCP, KEEPALIVE_TIME, secs)? } + } + + Ok(()) +} + +#[cfg(not(any(target_os = "haiku", target_os = "openbsd", target_os = "nto")))] +fn into_secs(duration: Duration) -> c_int { + min(duration.as_secs(), c_int::max_value() as u64) as c_int +} + +/// Add `flag` to the current set flags of `F_GETFD`. +fn fcntl_add(fd: Socket, get_cmd: c_int, set_cmd: c_int, flag: c_int) -> io::Result<()> { + let previous = syscall!(fcntl(fd, get_cmd))?; + let new = previous | flag; + if new != previous { + syscall!(fcntl(fd, set_cmd, new)).map(|_| ()) + } else { + // Flag was already set. + Ok(()) + } +} + +/// Remove `flag` to the current set flags of `F_GETFD`. +fn fcntl_remove(fd: Socket, get_cmd: c_int, set_cmd: c_int, flag: c_int) -> io::Result<()> { + let previous = syscall!(fcntl(fd, get_cmd))?; + let new = previous & !flag; + if new != previous { + syscall!(fcntl(fd, set_cmd, new)).map(|_| ()) + } else { + // Flag was already set. + Ok(()) + } +} + +/// Caller must ensure `T` is the correct type for `opt` and `val`. +pub(crate) unsafe fn getsockopt<T>(fd: Socket, opt: c_int, val: c_int) -> io::Result<T> { + let mut payload: MaybeUninit<T> = MaybeUninit::uninit(); + let mut len = size_of::<T>() as libc::socklen_t; + syscall!(getsockopt( + fd, + opt, + val, + payload.as_mut_ptr().cast(), + &mut len, + )) + .map(|_| { + debug_assert_eq!(len as usize, size_of::<T>()); + // Safety: `getsockopt` initialised `payload` for us. + payload.assume_init() + }) +} + +/// Caller must ensure `T` is the correct type for `opt` and `val`. +pub(crate) unsafe fn setsockopt<T>( + fd: Socket, + opt: c_int, + val: c_int, + payload: T, +) -> io::Result<()> { + let payload = &payload as *const T as *const c_void; + syscall!(setsockopt( + fd, + opt, + val, + payload, + mem::size_of::<T>() as libc::socklen_t, + )) + .map(|_| ()) +} + +pub(crate) fn to_in_addr(addr: &Ipv4Addr) -> in_addr { + // `s_addr` is stored as BE on all machines, and the array is in BE order. + // So the native endian conversion method is used so that it's never + // swapped. + in_addr { + s_addr: u32::from_ne_bytes(addr.octets()), + } +} + +pub(crate) fn from_in_addr(in_addr: in_addr) -> Ipv4Addr { + Ipv4Addr::from(in_addr.s_addr.to_ne_bytes()) +} + +pub(crate) fn to_in6_addr(addr: &Ipv6Addr) -> in6_addr { + in6_addr { + s6_addr: addr.octets(), + } +} + +pub(crate) fn from_in6_addr(addr: in6_addr) -> Ipv6Addr { + Ipv6Addr::from(addr.s6_addr) +} + +#[cfg(not(any( + target_os = "haiku", + target_os = "illumos", + target_os = "netbsd", + target_os = "openbsd", + target_os = "redox", + target_os = "solaris", + target_os = "nto", +)))] +pub(crate) fn to_mreqn( + multiaddr: &Ipv4Addr, + interface: &crate::socket::InterfaceIndexOrAddress, +) -> libc::ip_mreqn { + match interface { + crate::socket::InterfaceIndexOrAddress::Index(interface) => libc::ip_mreqn { + imr_multiaddr: to_in_addr(multiaddr), + imr_address: to_in_addr(&Ipv4Addr::UNSPECIFIED), + imr_ifindex: *interface as _, + }, + crate::socket::InterfaceIndexOrAddress::Address(interface) => libc::ip_mreqn { + imr_multiaddr: to_in_addr(multiaddr), + imr_address: to_in_addr(interface), + imr_ifindex: 0, + }, + } +} + +/// Unix only API. +impl crate::Socket { + /// Accept a new incoming connection from this listener. + /// + /// This function directly corresponds to the `accept4(2)` function. + /// + /// This function will block the calling thread until a new connection is + /// established. When established, the corresponding `Socket` and the remote + /// peer's address will be returned. + #[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ) + ))) + )] + pub fn accept4(&self, flags: c_int) -> io::Result<(crate::Socket, SockAddr)> { + self._accept4(flags) + } + + #[cfg(any( + target_os = "android", + target_os = "dragonfly", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "illumos", + target_os = "linux", + target_os = "netbsd", + target_os = "openbsd" + ))] + pub(crate) fn _accept4(&self, flags: c_int) -> io::Result<(crate::Socket, SockAddr)> { + // Safety: `accept4` initialises the `SockAddr` for us. + unsafe { + SockAddr::init(|storage, len| { + syscall!(accept4(self.as_raw(), storage.cast(), len, flags)) + .map(crate::Socket::from_raw) + }) + } + } + + /// Sets `CLOEXEC` on the socket. + /// + /// # Notes + /// + /// On supported platforms you can use [`Type::cloexec`]. + #[cfg(feature = "all")] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", unix))))] + pub fn set_cloexec(&self, close_on_exec: bool) -> io::Result<()> { + self._set_cloexec(close_on_exec) + } + + pub(crate) fn _set_cloexec(&self, close_on_exec: bool) -> io::Result<()> { + if close_on_exec { + fcntl_add( + self.as_raw(), + libc::F_GETFD, + libc::F_SETFD, + libc::FD_CLOEXEC, + ) + } else { + fcntl_remove( + self.as_raw(), + libc::F_GETFD, + libc::F_SETFD, + libc::FD_CLOEXEC, + ) + } + } + + /// Sets `SO_NOSIGPIPE` on the socket. + #[cfg(all(feature = "all", any(doc, target_vendor = "apple")))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_vendor = "apple"))))] + pub fn set_nosigpipe(&self, nosigpipe: bool) -> io::Result<()> { + self._set_nosigpipe(nosigpipe) + } + + #[cfg(target_vendor = "apple")] + pub(crate) fn _set_nosigpipe(&self, nosigpipe: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_NOSIGPIPE, + nosigpipe as c_int, + ) + } + } + + /// Gets the value of the `TCP_MAXSEG` option on this socket. + /// + /// For more information about this option, see [`set_mss`]. + /// + /// [`set_mss`]: crate::Socket::set_mss + #[cfg(all(feature = "all", not(target_os = "redox")))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", unix, not(target_os = "redox")))))] + pub fn mss(&self) -> io::Result<u32> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::IPPROTO_TCP, libc::TCP_MAXSEG) + .map(|mss| mss as u32) + } + } + + /// Sets the value of the `TCP_MAXSEG` option on this socket. + /// + /// The `TCP_MAXSEG` option denotes the TCP Maximum Segment Size and is only + /// available on TCP sockets. + #[cfg(all(feature = "all", not(target_os = "redox")))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", unix, not(target_os = "redox")))))] + pub fn set_mss(&self, mss: u32) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::IPPROTO_TCP, + libc::TCP_MAXSEG, + mss as c_int, + ) + } + } + + /// Returns `true` if `listen(2)` was called on this socket by checking the + /// `SO_ACCEPTCONN` option on this socket. + #[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + ) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + ) + ))) + )] + pub fn is_listener(&self) -> io::Result<bool> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_SOCKET, libc::SO_ACCEPTCONN) + .map(|v| v != 0) + } + } + + /// Returns the [`Domain`] of this socket by checking the `SO_DOMAIN` option + /// on this socket. + #[cfg(all( + feature = "all", + any( + target_os = "android", + // TODO: add FreeBSD. + // target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + ) + ))] + #[cfg_attr(docsrs, doc(cfg(all( + feature = "all", + any( + target_os = "android", + // TODO: add FreeBSD. + // target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + ) + ))))] + pub fn domain(&self) -> io::Result<Domain> { + unsafe { getsockopt::<c_int>(self.as_raw(), libc::SOL_SOCKET, libc::SO_DOMAIN).map(Domain) } + } + + /// Returns the [`Protocol`] of this socket by checking the `SO_PROTOCOL` + /// option on this socket. + #[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + ) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "fuchsia", + target_os = "linux", + ) + ))) + )] + pub fn protocol(&self) -> io::Result<Option<Protocol>> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_SOCKET, libc::SO_PROTOCOL).map(|v| match v + { + 0 => None, + p => Some(Protocol(p)), + }) + } + } + + /// Gets the value for the `SO_MARK` option on this socket. + /// + /// This value gets the socket mark field for each packet sent through + /// this socket. + /// + /// On Linux this function requires the `CAP_NET_ADMIN` capability. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn mark(&self) -> io::Result<u32> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_SOCKET, libc::SO_MARK) + .map(|mark| mark as u32) + } + } + + /// Sets the value for the `SO_MARK` option on this socket. + /// + /// This value sets the socket mark field for each packet sent through + /// this socket. Changing the mark can be used for mark-based routing + /// without netfilter or for packet filtering. + /// + /// On Linux this function requires the `CAP_NET_ADMIN` capability. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn set_mark(&self, mark: u32) -> io::Result<()> { + unsafe { + setsockopt::<c_int>( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_MARK, + mark as c_int, + ) + } + } + + /// Get the value of the `TCP_CORK` option on this socket. + /// + /// For more information about this option, see [`set_cork`]. + /// + /// [`set_cork`]: Socket::set_cork + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn cork(&self) -> io::Result<bool> { + unsafe { + getsockopt::<Bool>(self.as_raw(), libc::IPPROTO_TCP, libc::TCP_CORK) + .map(|cork| cork != 0) + } + } + + /// Set the value of the `TCP_CORK` option on this socket. + /// + /// If set, don't send out partial frames. All queued partial frames are + /// sent when the option is cleared again. There is a 200 millisecond ceiling on + /// the time for which output is corked by `TCP_CORK`. If this ceiling is reached, + /// then queued data is automatically transmitted. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn set_cork(&self, cork: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::IPPROTO_TCP, + libc::TCP_CORK, + cork as c_int, + ) + } + } + + /// Get the value of the `TCP_QUICKACK` option on this socket. + /// + /// For more information about this option, see [`set_quickack`]. + /// + /// [`set_quickack`]: Socket::set_quickack + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn quickack(&self) -> io::Result<bool> { + unsafe { + getsockopt::<Bool>(self.as_raw(), libc::IPPROTO_TCP, libc::TCP_QUICKACK) + .map(|quickack| quickack != 0) + } + } + + /// Set the value of the `TCP_QUICKACK` option on this socket. + /// + /// If set, acks are sent immediately, rather than delayed if needed in accordance to normal + /// TCP operation. This flag is not permanent, it only enables a switch to or from quickack mode. + /// Subsequent operation of the TCP protocol will once again enter/leave quickack mode depending on + /// internal protocol processing and factors such as delayed ack timeouts occurring and data transfer. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn set_quickack(&self, quickack: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::IPPROTO_TCP, + libc::TCP_QUICKACK, + quickack as c_int, + ) + } + } + + /// Get the value of the `TCP_THIN_LINEAR_TIMEOUTS` option on this socket. + /// + /// For more information about this option, see [`set_thin_linear_timeouts`]. + /// + /// [`set_thin_linear_timeouts`]: Socket::set_thin_linear_timeouts + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn thin_linear_timeouts(&self) -> io::Result<bool> { + unsafe { + getsockopt::<Bool>( + self.as_raw(), + libc::IPPROTO_TCP, + libc::TCP_THIN_LINEAR_TIMEOUTS, + ) + .map(|timeouts| timeouts != 0) + } + } + + /// Set the value of the `TCP_THIN_LINEAR_TIMEOUTS` option on this socket. + /// + /// If set, the kernel will dynamically detect a thin-stream connection if there are less than four packets in flight. + /// With less than four packets in flight the normal TCP fast retransmission will not be effective. + /// The kernel will modify the retransmission to avoid the very high latencies that thin stream suffer because of exponential backoff. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn set_thin_linear_timeouts(&self, timeouts: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::IPPROTO_TCP, + libc::TCP_THIN_LINEAR_TIMEOUTS, + timeouts as c_int, + ) + } + } + + /// Gets the value for the `SO_BINDTODEVICE` option on this socket. + /// + /// This value gets the socket binded device's interface name. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn device(&self) -> io::Result<Option<Vec<u8>>> { + // TODO: replace with `MaybeUninit::uninit_array` once stable. + let mut buf: [MaybeUninit<u8>; libc::IFNAMSIZ] = + unsafe { MaybeUninit::uninit().assume_init() }; + let mut len = buf.len() as libc::socklen_t; + syscall!(getsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_BINDTODEVICE, + buf.as_mut_ptr().cast(), + &mut len, + ))?; + if len == 0 { + Ok(None) + } else { + let buf = &buf[..len as usize - 1]; + // TODO: use `MaybeUninit::slice_assume_init_ref` once stable. + Ok(Some(unsafe { &*(buf as *const [_] as *const [u8]) }.into())) + } + } + + /// Sets the value for the `SO_BINDTODEVICE` option on this socket. + /// + /// If a socket is bound to an interface, only packets received from that + /// particular interface are processed by the socket. Note that this only + /// works for some socket types, particularly `AF_INET` sockets. + /// + /// If `interface` is `None` or an empty string it removes the binding. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn bind_device(&self, interface: Option<&[u8]>) -> io::Result<()> { + let (value, len) = if let Some(interface) = interface { + (interface.as_ptr(), interface.len()) + } else { + (ptr::null(), 0) + }; + syscall!(setsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_BINDTODEVICE, + value.cast(), + len as libc::socklen_t, + )) + .map(|_| ()) + } + + /// Sets the value for the `SO_SETFIB` option on this socket. + /// + /// Bind socket to the specified forwarding table (VRF) on a FreeBSD. + #[cfg(all(feature = "all", any(target_os = "freebsd")))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", any(target_os = "freebsd")))))] + pub fn set_fib(&self, fib: u32) -> io::Result<()> { + syscall!(setsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_SETFIB, + (&fib as *const u32).cast(), + mem::size_of::<u32>() as libc::socklen_t, + )) + .map(|_| ()) + } + + /// Sets the value for `IP_BOUND_IF` option on this socket. + /// + /// If a socket is bound to an interface, only packets received from that + /// particular interface are processed by the socket. + /// + /// If `interface` is `None`, the binding is removed. If the `interface` + /// index is not valid, an error is returned. + /// + /// One can use `libc::if_nametoindex` to convert an interface alias to an + /// index. + #[cfg(all(feature = "all", target_vendor = "apple"))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_vendor = "apple"))))] + pub fn bind_device_by_index(&self, interface: Option<NonZeroU32>) -> io::Result<()> { + let index = interface.map(NonZeroU32::get).unwrap_or(0); + unsafe { setsockopt(self.as_raw(), IPPROTO_IP, libc::IP_BOUND_IF, index) } + } + + /// Gets the value for `IP_BOUND_IF` option on this socket, i.e. the index + /// for the interface to which the socket is bound. + /// + /// Returns `None` if the socket is not bound to any interface, otherwise + /// returns an interface index. + #[cfg(all(feature = "all", target_vendor = "apple"))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_vendor = "apple"))))] + pub fn device_index(&self) -> io::Result<Option<NonZeroU32>> { + let index = + unsafe { getsockopt::<libc::c_uint>(self.as_raw(), IPPROTO_IP, libc::IP_BOUND_IF)? }; + Ok(NonZeroU32::new(index)) + } + + /// Get the value of the `SO_INCOMING_CPU` option on this socket. + /// + /// For more information about this option, see [`set_cpu_affinity`]. + /// + /// [`set_cpu_affinity`]: crate::Socket::set_cpu_affinity + #[cfg(all(feature = "all", target_os = "linux"))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_os = "linux"))))] + pub fn cpu_affinity(&self) -> io::Result<usize> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_SOCKET, libc::SO_INCOMING_CPU) + .map(|cpu| cpu as usize) + } + } + + /// Set value for the `SO_INCOMING_CPU` option on this socket. + /// + /// Sets the CPU affinity of the socket. + #[cfg(all(feature = "all", target_os = "linux"))] + #[cfg_attr(docsrs, doc(cfg(all(feature = "all", target_os = "linux"))))] + pub fn set_cpu_affinity(&self, cpu: usize) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_INCOMING_CPU, + cpu as c_int, + ) + } + } + + /// Get the value of the `SO_REUSEPORT` option on this socket. + /// + /// For more information about this option, see [`set_reuse_port`]. + /// + /// [`set_reuse_port`]: crate::Socket::set_reuse_port + #[cfg(all( + feature = "all", + not(any(target_os = "solaris", target_os = "illumos")) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + unix, + not(any(target_os = "solaris", target_os = "illumos")) + ))) + )] + pub fn reuse_port(&self) -> io::Result<bool> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_SOCKET, libc::SO_REUSEPORT) + .map(|reuse| reuse != 0) + } + } + + /// Set value for the `SO_REUSEPORT` option on this socket. + /// + /// This indicates that further calls to `bind` may allow reuse of local + /// addresses. For IPv4 sockets this means that a socket may bind even when + /// there's a socket already listening on this port. + #[cfg(all( + feature = "all", + not(any(target_os = "solaris", target_os = "illumos")) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + unix, + not(any(target_os = "solaris", target_os = "illumos")) + ))) + )] + pub fn set_reuse_port(&self, reuse: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_REUSEPORT, + reuse as c_int, + ) + } + } + + /// Get the value of the `IP_FREEBIND` option on this socket. + /// + /// For more information about this option, see [`set_freebind`]. + /// + /// [`set_freebind`]: crate::Socket::set_freebind + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn freebind(&self) -> io::Result<bool> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_IP, libc::IP_FREEBIND) + .map(|freebind| freebind != 0) + } + } + + /// Set value for the `IP_FREEBIND` option on this socket. + /// + /// If enabled, this boolean option allows binding to an IP address that is + /// nonlocal or does not (yet) exist. This permits listening on a socket, + /// without requiring the underlying network interface or the specified + /// dynamic IP address to be up at the time that the application is trying + /// to bind to it. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn set_freebind(&self, freebind: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::SOL_IP, + libc::IP_FREEBIND, + freebind as c_int, + ) + } + } + + /// Get the value of the `IPV6_FREEBIND` option on this socket. + /// + /// This is an IPv6 counterpart of `IP_FREEBIND` socket option on + /// Android/Linux. For more information about this option, see + /// [`set_freebind`]. + /// + /// [`set_freebind`]: crate::Socket::set_freebind + #[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))) + )] + pub fn freebind_ipv6(&self) -> io::Result<bool> { + unsafe { + getsockopt::<c_int>(self.as_raw(), libc::SOL_IPV6, libc::IPV6_FREEBIND) + .map(|freebind| freebind != 0) + } + } + + /// Set value for the `IPV6_FREEBIND` option on this socket. + /// + /// This is an IPv6 counterpart of `IP_FREEBIND` socket option on + /// Android/Linux. For more information about this option, see + /// [`set_freebind`]. + /// + /// [`set_freebind`]: crate::Socket::set_freebind + /// + /// # Examples + /// + /// On Linux: + /// + /// ``` + /// use socket2::{Domain, Socket, Type}; + /// use std::io::{self, Error, ErrorKind}; + /// + /// fn enable_freebind(socket: &Socket) -> io::Result<()> { + /// match socket.domain()? { + /// Domain::IPV4 => socket.set_freebind(true)?, + /// Domain::IPV6 => socket.set_freebind_ipv6(true)?, + /// _ => return Err(Error::new(ErrorKind::Other, "unsupported domain")), + /// }; + /// Ok(()) + /// } + /// + /// # fn main() -> io::Result<()> { + /// # let socket = Socket::new(Domain::IPV6, Type::STREAM, None)?; + /// # enable_freebind(&socket) + /// # } + /// ``` + #[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))] + #[cfg_attr( + docsrs, + doc(cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))) + )] + pub fn set_freebind_ipv6(&self, freebind: bool) -> io::Result<()> { + unsafe { + setsockopt( + self.as_raw(), + libc::SOL_IPV6, + libc::IPV6_FREEBIND, + freebind as c_int, + ) + } + } + + /// Copies data between a `file` and this socket using the `sendfile(2)` + /// system call. Because this copying is done within the kernel, + /// `sendfile()` is more efficient than the combination of `read(2)` and + /// `write(2)`, which would require transferring data to and from user + /// space. + /// + /// Different OSs support different kinds of `file`s, see the OS + /// documentation for what kind of files are supported. Generally *regular* + /// files are supported by all OSs. + /// + /// The `offset` is the absolute offset into the `file` to use as starting + /// point. + /// + /// Depending on the OS this function *may* change the offset of `file`. For + /// the best results reset the offset of the file before using it again. + /// + /// The `length` determines how many bytes to send, where a length of `None` + /// means it will try to send all bytes. + #[cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "linux", + target_vendor = "apple", + ) + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any( + target_os = "android", + target_os = "freebsd", + target_os = "linux", + target_vendor = "apple", + ) + ))) + )] + pub fn sendfile<F>( + &self, + file: &F, + offset: usize, + length: Option<NonZeroUsize>, + ) -> io::Result<usize> + where + F: AsRawFd, + { + self._sendfile(file.as_raw_fd(), offset as _, length) + } + + #[cfg(all(feature = "all", target_vendor = "apple"))] + fn _sendfile( + &self, + file: RawFd, + offset: libc::off_t, + length: Option<NonZeroUsize>, + ) -> io::Result<usize> { + // On macOS `length` is value-result parameter. It determines the number + // of bytes to write and returns the number of bytes written. + let mut length = match length { + Some(n) => n.get() as libc::off_t, + // A value of `0` means send all bytes. + None => 0, + }; + syscall!(sendfile( + file, + self.as_raw(), + offset, + &mut length, + ptr::null_mut(), + 0, + )) + .map(|_| length as usize) + } + + #[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))] + fn _sendfile( + &self, + file: RawFd, + offset: libc::off_t, + length: Option<NonZeroUsize>, + ) -> io::Result<usize> { + let count = match length { + Some(n) => n.get() as libc::size_t, + // The maximum the Linux kernel will write in a single call. + None => 0x7ffff000, // 2,147,479,552 bytes. + }; + let mut offset = offset; + syscall!(sendfile(self.as_raw(), file, &mut offset, count)).map(|n| n as usize) + } + + #[cfg(all(feature = "all", target_os = "freebsd"))] + fn _sendfile( + &self, + file: RawFd, + offset: libc::off_t, + length: Option<NonZeroUsize>, + ) -> io::Result<usize> { + let nbytes = match length { + Some(n) => n.get() as libc::size_t, + // A value of `0` means send all bytes. + None => 0, + }; + let mut sbytes: libc::off_t = 0; + syscall!(sendfile( + file, + self.as_raw(), + offset, + nbytes, + ptr::null_mut(), + &mut sbytes, + 0, + )) + .map(|_| sbytes as usize) + } + + /// Set the value of the `TCP_USER_TIMEOUT` option on this socket. + /// + /// If set, this specifies the maximum amount of time that transmitted data may remain + /// unacknowledged or buffered data may remain untransmitted before TCP will forcibly close the + /// corresponding connection. + /// + /// Setting `timeout` to `None` or a zero duration causes the system default timeouts to + /// be used. If `timeout` in milliseconds is larger than `c_uint::MAX`, the timeout is clamped + /// to `c_uint::MAX`. For example, when `c_uint` is a 32-bit value, this limits the timeout to + /// approximately 49.71 days. + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn set_tcp_user_timeout(&self, timeout: Option<Duration>) -> io::Result<()> { + let timeout = timeout + .map(|to| min(to.as_millis(), libc::c_uint::MAX as u128) as libc::c_uint) + .unwrap_or(0); + unsafe { + setsockopt( + self.as_raw(), + libc::IPPROTO_TCP, + libc::TCP_USER_TIMEOUT, + timeout, + ) + } + } + + /// Get the value of the `TCP_USER_TIMEOUT` option on this socket. + /// + /// For more information about this option, see [`set_tcp_user_timeout`]. + /// + /// [`set_tcp_user_timeout`]: Socket::set_tcp_user_timeout + #[cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))] + #[cfg_attr( + docsrs, + doc(cfg(all( + feature = "all", + any(target_os = "android", target_os = "fuchsia", target_os = "linux") + ))) + )] + pub fn tcp_user_timeout(&self) -> io::Result<Option<Duration>> { + unsafe { + getsockopt::<libc::c_uint>(self.as_raw(), libc::IPPROTO_TCP, libc::TCP_USER_TIMEOUT) + .map(|millis| { + if millis == 0 { + None + } else { + Some(Duration::from_millis(millis as u64)) + } + }) + } + } + + /// Attach Berkeley Packet Filter(BPF) on this socket. + /// + /// BPF allows a user-space program to attach a filter onto any socket + /// and allow or disallow certain types of data to come through the socket. + /// + /// For more information about this option, see [filter](https://www.kernel.org/doc/html/v5.12/networking/filter.html) + #[cfg(all(feature = "all", any(target_os = "linux", target_os = "android")))] + pub fn attach_filter(&self, filters: &[libc::sock_filter]) -> io::Result<()> { + let prog = libc::sock_fprog { + len: filters.len() as u16, + filter: filters.as_ptr() as *mut _, + }; + + unsafe { + setsockopt( + self.as_raw(), + libc::SOL_SOCKET, + libc::SO_ATTACH_FILTER, + prog, + ) + } + } + + /// Detach Berkeley Packet Filter(BPF) from this socket. + /// + /// For more information about this option, see [`attach_filter`] + #[cfg(all(feature = "all", any(target_os = "linux", target_os = "android")))] + pub fn detach_filter(&self) -> io::Result<()> { + unsafe { setsockopt(self.as_raw(), libc::SOL_SOCKET, libc::SO_DETACH_FILTER, 0) } + } +} + +#[cfg_attr(docsrs, doc(cfg(unix)))] +impl AsRawFd for crate::Socket { + fn as_raw_fd(&self) -> c_int { + self.as_raw() + } +} + +#[cfg_attr(docsrs, doc(cfg(unix)))] +impl IntoRawFd for crate::Socket { + fn into_raw_fd(self) -> c_int { + self.into_raw() + } +} + +#[cfg_attr(docsrs, doc(cfg(unix)))] +impl FromRawFd for crate::Socket { + unsafe fn from_raw_fd(fd: c_int) -> crate::Socket { + crate::Socket::from_raw(fd) + } +} + +#[cfg(feature = "all")] +from!(UnixStream, crate::Socket); +#[cfg(feature = "all")] +from!(UnixListener, crate::Socket); +#[cfg(feature = "all")] +from!(UnixDatagram, crate::Socket); +#[cfg(feature = "all")] +from!(crate::Socket, UnixStream); +#[cfg(feature = "all")] +from!(crate::Socket, UnixListener); +#[cfg(feature = "all")] +from!(crate::Socket, UnixDatagram); + +#[test] +fn in_addr_convertion() { + let ip = Ipv4Addr::new(127, 0, 0, 1); + let raw = to_in_addr(&ip); + // NOTE: `in_addr` is packed on NetBSD and it's unsafe to borrow. + let a = raw.s_addr; + assert_eq!(a, u32::from_ne_bytes([127, 0, 0, 1])); + assert_eq!(from_in_addr(raw), ip); + + let ip = Ipv4Addr::new(127, 34, 4, 12); + let raw = to_in_addr(&ip); + let a = raw.s_addr; + assert_eq!(a, u32::from_ne_bytes([127, 34, 4, 12])); + assert_eq!(from_in_addr(raw), ip); +} + +#[test] +fn in6_addr_convertion() { + let ip = Ipv6Addr::new(0x2000, 1, 2, 3, 4, 5, 6, 7); + let raw = to_in6_addr(&ip); + let want = [32, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7]; + assert_eq!(raw.s6_addr, want); + assert_eq!(from_in6_addr(raw), ip); +} |