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|
use super::super::c;
#[cfg(unix)]
use super::addr::SocketAddrUnix;
use super::ext::{in6_addr_s6_addr, in_addr_s_addr, sockaddr_in6_sin6_scope_id};
#[cfg(not(windows))]
use crate::ffi::CStr;
use crate::io;
use crate::net::{Ipv4Addr, Ipv6Addr, SocketAddrAny, SocketAddrV4, SocketAddrV6};
#[cfg(not(windows))]
use alloc::vec::Vec;
use core::mem::size_of;
// This must match the header of `sockaddr`.
#[repr(C)]
struct sockaddr_header {
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
))]
sa_len: u8,
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
))]
ss_family: u8,
#[cfg(not(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
)))]
ss_family: u16,
}
#[inline]
unsafe fn read_ss_family(storage: *const c::sockaddr_storage) -> u16 {
// Assert that we know the layout of `sockaddr`.
let _ = c::sockaddr {
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
))]
sa_len: 0_u8,
#[cfg(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
))]
sa_family: 0_u8,
#[cfg(not(any(
target_os = "dragonfly",
target_os = "freebsd",
target_os = "ios",
target_os = "macos",
target_os = "netbsd",
target_os = "openbsd",
)))]
sa_family: 0_u16,
sa_data: [0; 14],
};
(*storage.cast::<sockaddr_header>()).ss_family.into()
}
/// Set the `ss_family` field of a socket address to `AF_UNSPEC`, so that we
/// can test for `AF_UNSPEC` to test whether it was stored to.
pub(crate) unsafe fn initialize_family_to_unspec(storage: *mut c::sockaddr_storage) {
(*storage.cast::<sockaddr_header>()).ss_family = c::AF_UNSPEC as _;
}
pub(crate) unsafe fn read_sockaddr(
storage: *const c::sockaddr_storage,
len: usize,
) -> io::Result<SocketAddrAny> {
#[cfg(unix)]
let offsetof_sun_path = super::addr::offsetof_sun_path();
if len < size_of::<c::sa_family_t>() {
return Err(io::Errno::INVAL);
}
match read_ss_family(storage).into() {
c::AF_INET => {
if len < size_of::<c::sockaddr_in>() {
return Err(io::Errno::INVAL);
}
let decode = *storage.cast::<c::sockaddr_in>();
Ok(SocketAddrAny::V4(SocketAddrV4::new(
Ipv4Addr::from(u32::from_be(in_addr_s_addr(decode.sin_addr))),
u16::from_be(decode.sin_port),
)))
}
c::AF_INET6 => {
if len < size_of::<c::sockaddr_in6>() {
return Err(io::Errno::INVAL);
}
let decode = *storage.cast::<c::sockaddr_in6>();
#[cfg(not(windows))]
let s6_addr = decode.sin6_addr.s6_addr;
#[cfg(windows)]
let s6_addr = decode.sin6_addr.u.Byte;
#[cfg(not(windows))]
let sin6_scope_id = decode.sin6_scope_id;
#[cfg(windows)]
let sin6_scope_id = decode.Anonymous.sin6_scope_id;
Ok(SocketAddrAny::V6(SocketAddrV6::new(
Ipv6Addr::from(s6_addr),
u16::from_be(decode.sin6_port),
u32::from_be(decode.sin6_flowinfo),
sin6_scope_id,
)))
}
#[cfg(unix)]
c::AF_UNIX => {
if len < offsetof_sun_path {
return Err(io::Errno::INVAL);
}
if len == offsetof_sun_path {
Ok(SocketAddrAny::Unix(SocketAddrUnix::new(&[][..]).unwrap()))
} else {
let decode = *storage.cast::<c::sockaddr_un>();
// Trim off unused bytes from the end of `path_bytes`.
let path_bytes = if cfg!(target_os = "freebsd") {
// FreeBSD sometimes sets the length to longer than the length
// of the NUL-terminated string. Find the NUL and truncate the
// string accordingly.
&decode.sun_path[..decode.sun_path.iter().position(|b| *b == 0).unwrap()]
} else {
// Otherwise, use the provided length.
let provided_len = len - 1 - offsetof_sun_path;
if decode.sun_path[provided_len] != b'\0' as c::c_char {
return Err(io::Errno::INVAL);
}
debug_assert_eq!(
CStr::from_ptr(decode.sun_path.as_ptr()).to_bytes().len(),
provided_len
);
&decode.sun_path[..provided_len]
};
Ok(SocketAddrAny::Unix(
SocketAddrUnix::new(path_bytes.iter().map(|c| *c as u8).collect::<Vec<u8>>())
.unwrap(),
))
}
}
_ => Err(io::Errno::INVAL),
}
}
pub(crate) unsafe fn maybe_read_sockaddr_os(
storage: *const c::sockaddr_storage,
len: usize,
) -> Option<SocketAddrAny> {
if len == 0 {
return None;
}
assert!(len >= size_of::<c::sa_family_t>());
let family = read_ss_family(storage).into();
if family == c::AF_UNSPEC {
None
} else {
Some(inner_read_sockaddr_os(family, storage, len))
}
}
pub(crate) unsafe fn read_sockaddr_os(
storage: *const c::sockaddr_storage,
len: usize,
) -> SocketAddrAny {
assert!(len >= size_of::<c::sa_family_t>());
let family = read_ss_family(storage).into();
inner_read_sockaddr_os(family, storage, len)
}
unsafe fn inner_read_sockaddr_os(
family: c::c_int,
storage: *const c::sockaddr_storage,
len: usize,
) -> SocketAddrAny {
#[cfg(unix)]
let offsetof_sun_path = super::addr::offsetof_sun_path();
assert!(len >= size_of::<c::sa_family_t>());
match family {
c::AF_INET => {
assert!(len >= size_of::<c::sockaddr_in>());
let decode = *storage.cast::<c::sockaddr_in>();
SocketAddrAny::V4(SocketAddrV4::new(
Ipv4Addr::from(u32::from_be(in_addr_s_addr(decode.sin_addr))),
u16::from_be(decode.sin_port),
))
}
c::AF_INET6 => {
assert!(len >= size_of::<c::sockaddr_in6>());
let decode = *storage.cast::<c::sockaddr_in6>();
SocketAddrAny::V6(SocketAddrV6::new(
Ipv6Addr::from(in6_addr_s6_addr(decode.sin6_addr)),
u16::from_be(decode.sin6_port),
u32::from_be(decode.sin6_flowinfo),
sockaddr_in6_sin6_scope_id(decode),
))
}
#[cfg(unix)]
c::AF_UNIX => {
assert!(len >= offsetof_sun_path);
if len == offsetof_sun_path {
SocketAddrAny::Unix(SocketAddrUnix::new(&[][..]).unwrap())
} else {
let decode = *storage.cast::<c::sockaddr_un>();
assert_eq!(
decode.sun_path[len - 1 - offsetof_sun_path],
b'\0' as c::c_char
);
let path_bytes = &decode.sun_path[..len - 1 - offsetof_sun_path];
// FreeBSD sometimes sets the length to longer than the length
// of the NUL-terminated string. Find the NUL and truncate the
// string accordingly.
#[cfg(target_os = "freebsd")]
let path_bytes = &path_bytes[..path_bytes.iter().position(|b| *b == 0).unwrap()];
SocketAddrAny::Unix(
SocketAddrUnix::new(path_bytes.iter().map(|c| *c as u8).collect::<Vec<u8>>())
.unwrap(),
)
}
}
other => unimplemented!("{:?}", other),
}
}
|
