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use crate::ffi::OsStr;
#[cfg(any(doc, target_os = "android", target_os = "linux"))]
use crate::os::net::linux_ext;
use crate::os::unix::ffi::OsStrExt;
use crate::path::Path;
use crate::sealed::Sealed;
use crate::sys::cvt;
use crate::{fmt, io, mem, ptr};
#[cfg(not(unix))]
#[allow(non_camel_case_types)]
mod libc {
pub use libc::c_int;
pub type socklen_t = u32;
pub struct sockaddr;
#[derive(Clone)]
pub struct sockaddr_un;
}
fn sun_path_offset(addr: &libc::sockaddr_un) -> usize {
let base = (addr as *const libc::sockaddr_un).addr();
let path = (&addr.sun_path as *const libc::c_char).addr();
path - base
}
pub(super) fn sockaddr_un(path: &Path) -> io::Result<(libc::sockaddr_un, libc::socklen_t)> {
let mut addr: libc::sockaddr_un = unsafe { mem::zeroed() };
addr.sun_family = libc::AF_UNIX as libc::sa_family_t;
let bytes = path.as_os_str().as_bytes();
if bytes.contains(&0) {
return Err(io::const_io_error!(
io::ErrorKind::InvalidInput,
"paths must not contain interior null bytes",
));
}
if bytes.len() >= addr.sun_path.len() {
return Err(io::const_io_error!(
io::ErrorKind::InvalidInput,
"path must be shorter than SUN_LEN",
));
}
unsafe {
ptr::copy_nonoverlapping(bytes.as_ptr(), addr.sun_path.as_mut_ptr().cast(), bytes.len())
};
let mut len = sun_path_offset(&addr) + bytes.len();
match bytes.get(0) {
Some(&0) | None => {}
Some(_) => len += 1,
}
Ok((addr, len as libc::socklen_t))
}
enum AddressKind<'a> {
Unnamed,
Pathname(&'a Path),
Abstract(&'a [u8]),
}
#[derive(Clone)]
#[stable(feature = "unix_socket", since = "1.10.0")]
pub struct SocketAddr {
pub(super) addr: libc::sockaddr_un,
pub(super) len: libc::socklen_t,
}
impl SocketAddr {
pub(super) fn new<F>(f: F) -> io::Result<SocketAddr>
where
F: FnOnce(*mut libc::sockaddr, *mut libc::socklen_t) -> libc::c_int,
{
unsafe {
let mut addr: libc::sockaddr_un = mem::zeroed();
let mut len = mem::size_of::<libc::sockaddr_un>() as libc::socklen_t;
cvt(f(&mut addr as *mut _ as *mut _, &mut len))?;
SocketAddr::from_parts(addr, len)
}
}
pub(super) fn from_parts(
addr: libc::sockaddr_un,
mut len: libc::socklen_t,
) -> io::Result<SocketAddr> {
if len == 0 {
len = sun_path_offset(&addr) as libc::socklen_t; } else if addr.sun_family != libc::AF_UNIX as libc::sa_family_t {
return Err(io::const_io_error!(
io::ErrorKind::InvalidInput,
"file descriptor did not correspond to a Unix socket",
));
}
Ok(SocketAddr { addr, len })
}
#[stable(feature = "unix_socket_creation", since = "1.61.0")]
pub fn from_pathname<P>(path: P) -> io::Result<SocketAddr>
where
P: AsRef<Path>,
{
sockaddr_un(path.as_ref()).map(|(addr, len)| SocketAddr { addr, len })
}
#[must_use]
#[stable(feature = "unix_socket", since = "1.10.0")]
pub fn is_unnamed(&self) -> bool {
matches!(self.address(), AddressKind::Unnamed)
}
#[stable(feature = "unix_socket", since = "1.10.0")]
#[must_use]
pub fn as_pathname(&self) -> Option<&Path> {
if let AddressKind::Pathname(path) = self.address() { Some(path) } else { None }
}
fn address(&self) -> AddressKind<'_> {
let len = self.len as usize - sun_path_offset(&self.addr);
let path = unsafe { mem::transmute::<&[libc::c_char], &[u8]>(&self.addr.sun_path) };
if len == 0
|| (cfg!(not(any(target_os = "linux", target_os = "android")))
&& self.addr.sun_path[0] == 0)
{
AddressKind::Unnamed
} else if self.addr.sun_path[0] == 0 {
AddressKind::Abstract(&path[1..len])
} else {
AddressKind::Pathname(OsStr::from_bytes(&path[..len - 1]).as_ref())
}
}
}
#[unstable(feature = "unix_socket_abstract", issue = "85410")]
impl Sealed for SocketAddr {}
#[doc(cfg(any(target_os = "android", target_os = "linux")))]
#[cfg(any(doc, target_os = "android", target_os = "linux"))]
#[unstable(feature = "unix_socket_abstract", issue = "85410")]
impl linux_ext::addr::SocketAddrExt for SocketAddr {
fn as_abstract_name(&self) -> Option<&[u8]> {
if let AddressKind::Abstract(name) = self.address() { Some(name) } else { None }
}
fn from_abstract_name<N>(name: N) -> crate::io::Result<Self>
where
N: AsRef<[u8]>,
{
let name = name.as_ref();
unsafe {
let mut addr: libc::sockaddr_un = mem::zeroed();
addr.sun_family = libc::AF_UNIX as libc::sa_family_t;
if name.len() + 1 > addr.sun_path.len() {
return Err(io::const_io_error!(
io::ErrorKind::InvalidInput,
"abstract socket name must be shorter than SUN_LEN",
));
}
crate::ptr::copy_nonoverlapping(
name.as_ptr(),
addr.sun_path.as_mut_ptr().add(1) as *mut u8,
name.len(),
);
let len = (sun_path_offset(&addr) + 1 + name.len()) as libc::socklen_t;
SocketAddr::from_parts(addr, len)
}
}
}
#[stable(feature = "unix_socket", since = "1.10.0")]
impl fmt::Debug for SocketAddr {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
match self.address() {
AddressKind::Unnamed => write!(fmt, "(unnamed)"),
AddressKind::Abstract(name) => write!(fmt, "\"{}\" (abstract)", name.escape_ascii()),
AddressKind::Pathname(path) => write!(fmt, "{path:?} (pathname)"),
}
}
}