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unix.rs
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unix.rs
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// 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;
use std::ffi::OsStr;
#[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",
any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
)
))]
use std::num::NonZeroU32;
#[cfg(all(
feature = "all",
any(
target_os = "aix",
target_os = "android",
target_os = "freebsd",
target_os = "ios",
target_os = "visionos",
target_os = "linux",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
)
))]
use std::num::NonZeroUsize;
use std::os::unix::ffi::OsStrExt;
#[cfg(all(
feature = "all",
any(
target_os = "aix",
target_os = "android",
target_os = "freebsd",
target_os = "ios",
target_os = "visionos",
target_os = "linux",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
)
))]
use std::os::unix::io::RawFd;
use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, OwnedFd};
#[cfg(feature = "all")]
use std::os::unix::net::{UnixDatagram, UnixListener, UnixStream};
use std::path::Path;
use std::ptr;
use std::time::{Duration, Instant};
use std::{io, slice};
#[cfg(not(any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
)))]
use libc::ssize_t;
use libc::{in6_addr, in_addr};
use crate::{Domain, Protocol, SockAddr, TcpKeepalive, Type};
#[cfg(not(target_os = "redox"))]
use crate::{MsgHdr, MsgHdrMut, RecvFlags};
pub(crate) use libc::c_int;
// Used in `Domain`.
pub(crate) use libc::{AF_INET, AF_INET6, AF_UNIX};
// Used in `Type`.
#[cfg(all(feature = "all", target_os = "linux"))]
pub(crate) use libc::SOCK_DCCP;
#[cfg(all(feature = "all", not(any(target_os = "redox", target_os = "espidf"))))]
pub(crate) use libc::SOCK_RAW;
#[cfg(all(feature = "all", not(target_os = "espidf")))]
pub(crate) use libc::SOCK_SEQPACKET;
pub(crate) use libc::{SOCK_DGRAM, SOCK_STREAM};
// Used in `Protocol`.
#[cfg(all(feature = "all", target_os = "linux"))]
pub(crate) use libc::IPPROTO_DCCP;
#[cfg(target_os = "linux")]
pub(crate) use libc::IPPROTO_MPTCP;
#[cfg(all(feature = "all", any(target_os = "freebsd", target_os = "linux")))]
pub(crate) use libc::IPPROTO_SCTP;
#[cfg(all(
feature = "all",
any(
target_os = "android",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "linux",
)
))]
pub(crate) use libc::IPPROTO_UDPLITE;
pub(crate) use libc::{IPPROTO_ICMP, IPPROTO_ICMPV6, IPPROTO_TCP, IPPROTO_UDP};
// Used in `SockAddr`.
#[cfg(all(feature = "all", any(target_os = "freebsd", target_os = "openbsd")))]
pub(crate) use libc::IPPROTO_DIVERT;
pub(crate) use libc::{
sa_family_t, sockaddr, sockaddr_in, sockaddr_in6, sockaddr_storage, socklen_t,
};
// Used in `RecvFlags`.
#[cfg(not(any(target_os = "redox", target_os = "espidf")))]
pub(crate) use libc::MSG_TRUNC;
#[cfg(not(target_os = "redox"))]
pub(crate) use libc::SO_OOBINLINE;
// Used in `Socket`.
#[cfg(not(target_os = "nto"))]
pub(crate) use libc::ipv6_mreq as Ipv6Mreq;
#[cfg(not(any(
target_os = "dragonfly",
target_os = "fuchsia",
target_os = "hurd",
target_os = "illumos",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox",
target_os = "solaris",
target_os = "haiku",
target_os = "espidf",
target_os = "vita",
)))]
pub(crate) use libc::IPV6_RECVTCLASS;
#[cfg(all(feature = "all", not(any(target_os = "redox", target_os = "espidf"))))]
pub(crate) use libc::IP_HDRINCL;
#[cfg(not(any(
target_os = "aix",
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 = "hurd",
target_os = "nto",
target_os = "espidf",
target_os = "vita",
)))]
pub(crate) use libc::IP_RECVTOS;
#[cfg(not(any(
target_os = "fuchsia",
target_os = "redox",
target_os = "solaris",
target_os = "haiku",
target_os = "illumos",
)))]
pub(crate) use libc::IP_TOS;
#[cfg(not(any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
)))]
pub(crate) use libc::SO_LINGER;
#[cfg(any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
))]
pub(crate) use libc::SO_LINGER_SEC as SO_LINGER;
#[cfg(target_os = "linux")]
pub(crate) use libc::SO_PASSCRED;
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 = "hurd",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox",
target_os = "fuchsia",
target_os = "nto",
target_os = "espidf",
target_os = "vita",
)))]
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 = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "netbsd",
target_os = "nto",
target_os = "openbsd",
target_os = "solaris",
target_os = "tvos",
target_os = "watchos",
)))]
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 = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
target_os = "solaris",
target_os = "tvos",
target_os = "watchos",
))]
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 = "ios",
target_os = "visionos",
target_os = "linux",
target_os = "macos",
target_os = "netbsd",
target_os = "tvos",
target_os = "watchos",
)
))]
pub(crate) use libc::{TCP_KEEPCNT, TCP_KEEPINTVL};
// See this type in the Windows file.
pub(crate) type Bool = c_int;
#[cfg(any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "nto",
target_os = "tvos",
target_os = "watchos",
))]
use libc::TCP_KEEPALIVE as KEEPALIVE_TIME;
#[cfg(not(any(
target_os = "haiku",
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "nto",
target_os = "openbsd",
target_os = "tvos",
target_os = "watchos",
target_os = "vita",
)))]
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(any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
)))]
const MAX_BUF_LEN: usize = ssize_t::MAX 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(any(
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "tvos",
target_os = "watchos",
))]
const MAX_BUF_LEN: usize = c_int::MAX as usize - 1;
// TCP_CA_NAME_MAX isn't defined in user space include files(not in libc)
#[cfg(all(feature = "all", any(target_os = "freebsd", target_os = "linux")))]
const TCP_CA_NAME_MAX: usize = 16;
#[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",
target_env = "ohos",
all(target_env = "uclibc", target_pointer_width = "32")
)
),
target_os = "aix",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "haiku",
target_os = "hurd",
target_os = "illumos",
target_os = "ios",
target_os = "visionos",
target_os = "macos",
target_os = "netbsd",
target_os = "nto",
target_os = "openbsd",
target_os = "solaris",
target_os = "tvos",
target_os = "watchos",
target_os = "espidf",
target_os = "vita",
))]
type IovLen = c_int;
/// Unix only API.
impl Domain {
/// 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 = "hurd",
target_os = "illumos",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox",
target_os = "solaris",
)
))]
#[cfg_attr(
docsrs,
doc(cfg(all(
feature = "all",
any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "hurd",
target_os = "illumos",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox",
target_os = "solaris",
)
)))
)]
pub const fn cloexec(self) -> Type {
self._cloexec()
}
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "hurd",
target_os = "illumos",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd",
target_os = "redox",
target_os = "solaris",
))]
pub(crate) const fn _cloexec(self) -> Type {
Type(self.0 | libc::SOCK_CLOEXEC)
}
}
impl_debug!(
Type,
libc::SOCK_STREAM,
libc::SOCK_DGRAM,
#[cfg(all(feature = "all", target_os = "linux"))]
libc::SOCK_DCCP,
#[cfg(not(any(target_os = "redox", target_os = "espidf")))]
libc::SOCK_RAW,
#[cfg(not(any(target_os = "redox", target_os = "haiku", target_os = "espidf")))]
libc::SOCK_RDM,
#[cfg(not(target_os = "espidf"))]
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,
#[cfg(target_os = "linux")]
libc::IPPROTO_MPTCP,
#[cfg(all(feature = "all", target_os = "linux"))]
libc::IPPROTO_DCCP,
#[cfg(all(feature = "all", any(target_os = "freebsd", target_os = "linux")))]
libc::IPPROTO_SCTP,
#[cfg(all(
feature = "all",
any(
target_os = "android",
target_os = "freebsd",
target_os = "fuchsia",
target_os = "linux",
)
))]
libc::IPPROTO_UDPLITE,
#[cfg(all(feature = "all", any(target_os = "freebsd", target_os = "openbsd")))]
libc::IPPROTO_DIVERT,
);
/// 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`]), a record is terminated by
/// sending a message with the end-of-record flag set.
///
/// On Unix this corresponds to the `MSG_EOR` flag.
///
/// [`SEQPACKET`]: Type::SEQPACKET
#[cfg(not(target_os = "espidf"))]
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
}
/// Check if the confirm flag is set.
///
/// This is used by SocketCAN to indicate a frame was sent via the
/// socket it is received on. This flag can be interpreted as a
/// 'transmission confirmation'.
///
/// On Unix this corresponds to the `MSG_CONFIRM` flag.
#[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 fn is_confirm(self) -> bool {
self.0 & libc::MSG_CONFIRM != 0
}
/// Check if the don't route flag is set.
///
/// This is used by SocketCAN to indicate a frame was created
/// on the local host.
///
/// On Unix this corresponds to the `MSG_DONTROUTE` flag.
#[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 fn is_dontroute(self) -> bool {
self.0 & libc::MSG_DONTROUTE != 0
}
}
#[cfg(not(target_os = "redox"))]
impl std::fmt::Debug for RecvFlags {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let mut s = f.debug_struct("RecvFlags");
#[cfg(not(target_os = "espidf"))]
s.field("is_end_of_record", &self.is_end_of_record());
s.field("is_out_of_band", &self.is_out_of_band());
#[cfg(not(target_os = "espidf"))]
s.field("is_truncated", &self.is_truncated());
#[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))]
s.field("is_confirm", &self.is_confirm());
#[cfg(all(feature = "all", any(target_os = "android", target_os = "linux")))]
s.field("is_dontroute", &self.is_dontroute());
s.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) }
}
}
/// Returns the offset of the `sun_path` member of the passed unix socket address.
pub(crate) fn offset_of_path(storage: &libc::sockaddr_un) -> usize {
let base = storage as *const _ as usize;
let path = ptr::addr_of!(storage.sun_path) as usize;
path - base
}
#[allow(unsafe_op_in_unsafe_fn)]
pub(crate) fn unix_sockaddr(path: &Path) -> io::Result<SockAddr> {
// SAFETY: a `sockaddr_storage` of all zeros is valid.
let mut storage = unsafe { mem::zeroed::<sockaddr_storage>() };
let len = {
let storage = unsafe { &mut *ptr::addr_of_mut!(storage).cast::<libc::sockaddr_un>() };
let bytes = path.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.
// `storage` was initialized to zero above, so the path is
// already NULL terminated.
unsafe {
ptr::copy_nonoverlapping(
bytes.as_ptr(),
storage.sun_path.as_mut_ptr().cast(),
bytes.len(),
);
}
let sun_path_offset = offset_of_path(storage);
sun_path_offset
+ bytes.len()
+ match bytes.first() {
Some(&0) | None => 0,
Some(_) => 1,
}
};
Ok(unsafe { SockAddr::new(storage, len as socklen_t) })
}
// Used in `MsgHdr`.
#[cfg(not(target_os = "redox"))]
pub(crate) use libc::msghdr;
#[cfg(not(target_os = "redox"))]
pub(crate) fn set_msghdr_name(msg: &mut msghdr, name: &SockAddr) {
msg.msg_name = name.as_ptr() as *mut _;
msg.msg_namelen = name.len();
}
#[cfg(not(target_os = "redox"))]
#[allow(clippy::unnecessary_cast)] // IovLen type can be `usize`.
pub(crate) fn set_msghdr_iov(msg: &mut msghdr, ptr: *mut libc::iovec, len: usize) {
msg.msg_iov = ptr;
msg.msg_iovlen = min(len, IovLen::MAX as usize) as IovLen;
}
#[cfg(not(target_os = "redox"))]
pub(crate) fn set_msghdr_control(msg: &mut msghdr, ptr: *mut libc::c_void, len: usize) {
msg.msg_control = ptr;
msg.msg_controllen = len as _;
}
#[cfg(not(target_os = "redox"))]
pub(crate) fn set_msghdr_flags(msg: &mut msghdr, flags: libc::c_int) {
msg.msg_flags = flags;
}
#[cfg(not(target_os = "redox"))]
pub(crate) fn msghdr_flags(msg: &msghdr) -> RecvFlags {
RecvFlags(msg.msg_flags)
}
#[cfg(not(target_os = "redox"))]
pub(crate) fn msghdr_control_len(msg: &msghdr) -> usize {
msg.msg_controllen as _
}
/// Unix only API.
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(unsafe_op_in_unsafe_fn)]
#[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) -> SockAddr {
// SAFETY: a `sockaddr_storage` of all zeros is valid.
let mut storage = unsafe { mem::zeroed::<sockaddr_storage>() };
{
let storage: &mut libc::sockaddr_vm =
unsafe { &mut *((&mut storage as *mut sockaddr_storage).cast()) };
storage.svm_family = libc::AF_VSOCK as sa_family_t;
storage.svm_cid = cid;
storage.svm_port = port;
}
unsafe { SockAddr::new(storage, mem::size_of::<libc::sockaddr_vm>() as socklen_t) }
}
/// 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 as_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
}
}
/// Returns true if this address is an unnamed address from the `AF_UNIX` family (for local
/// interprocess communication), false otherwise.
pub fn is_unnamed(&self) -> bool {
self.as_sockaddr_un()
.map(|storage| {
self.len() == offset_of_path(storage) as _
// On some non-linux platforms a zeroed path is returned for unnamed.
// Abstract addresses only exist on Linux.
// NOTE: although Fuchsia does define `AF_UNIX` it's not actually implemented.
// See https://github.com/rust-lang/socket2/pull/403#discussion_r1123557978
|| (cfg!(not(any(target_os = "linux", target_os = "android")))
&& storage.sun_path[0] == 0)
})
.unwrap_or_default()
}
/// Returns the underlying `sockaddr_un` object if this addres is from the `AF_UNIX` family,
/// otherwise returns `None`.
pub(crate) fn as_sockaddr_un(&self) -> Option<&libc::sockaddr_un> {
self.is_unix().then(|| {
// SAFETY: if unix socket, i.e. the `ss_family` field is `AF_UNIX` then storage must be
// a `sockaddr_un`.
unsafe { &*self.as_ptr().cast::<libc::sockaddr_un>() }
})
}
/// Get the length of the path bytes of the address, not including the terminating or initial
/// (for abstract names) null byte.
///
/// Should not be called on unnamed addresses.
fn path_len(&self, storage: &libc::sockaddr_un) -> usize {
debug_assert!(!self.is_unnamed());
self.len() as usize - offset_of_path(storage) - 1
}
/// Get a u8 slice for the bytes of the pathname or abstract name.
///
/// Should not be called on unnamed addresses.
fn path_bytes(&self, storage: &libc::sockaddr_un, abstract_name: bool) -> &[u8] {
debug_assert!(!self.is_unnamed());
// SAFETY: the pointed objects of type `i8` have the same memory layout as `u8`. The path is
// the last field in the storage and so its length is equal to
// TOTAL_LENGTH - OFFSET_OF_PATH -1
// Where the 1 is either a terminating null if we have a pathname address, or the initial
// null byte, if it's an abstract name address. In the latter case, the path bytes start
// after the initial null byte, hence the `offset`.
// There is no safe way to convert a `&[i8]` to `&[u8]`
unsafe {
slice::from_raw_parts(
(storage.sun_path.as_ptr() as *const u8).offset(abstract_name as isize),
self.path_len(storage),
)
}
}
/// Returns this address as Unix `SocketAddr` if it is an `AF_UNIX` pathname
/// address, otherwise returns `None`.
pub fn as_unix(&self) -> Option<std::os::unix::net::SocketAddr> {
let path = self.as_pathname()?;
// SAFETY: we can represent this as a valid pathname, then so can the
// standard library.
Some(std::os::unix::net::SocketAddr::from_pathname(path).unwrap())
}
/// Returns this address as a `Path` reference if it is an `AF_UNIX`
/// pathname address, otherwise returns `None`.
pub fn as_pathname(&self) -> Option<&Path> {
self.as_sockaddr_un().and_then(|storage| {
(self.len() > offset_of_path(storage) as _ && storage.sun_path[0] != 0).then(|| {
let path_slice = self.path_bytes(storage, false);
Path::new::<OsStr>(OsStrExt::from_bytes(path_slice))
})
})
}
/// Returns this address as a slice of bytes representing an abstract address if it is an
/// `AF_UNIX` abstract address, otherwise returns `None`.
///
/// Abstract addresses are a Linux extension, so this method returns `None` on all non-Linux
/// platforms.
pub fn as_abstract_namespace(&self) -> Option<&[u8]> {
// NOTE: although Fuchsia does define `AF_UNIX` it's not actually implemented.
// See https://github.com/rust-lang/socket2/pull/403#discussion_r1123557978
#[cfg(any(target_os = "linux", target_os = "android"))]
{
self.as_sockaddr_un().and_then(|storage| {
(self.len() > offset_of_path(storage) as _ && storage.sun_path[0] == 0)
.then(|| self.path_bytes(storage, true))
})
}
#[cfg(not(any(target_os = "linux", target_os = "android")))]
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(all(feature = "all", unix))]
#[cfg_attr(docsrs, doc(cfg(all(feature = "all", unix))))]
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 = timeout.clamp(1, c_int::MAX 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)) | Err(err) => return Err(err),
Ok(None) => {
return Err(io::Error::new(
io::ErrorKind::Other,
"no error set after POLLHUP",
))
}
}
}
return Ok(());
}
// Got interrupted, try again.
Err(ref err) if err.kind() == io::ErrorKind::Interrupted => continue,
Err(err) => return Err(err),
}
}
}
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::try_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::try_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::try_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))
}