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nb-connect's Issues

Invalid assumption of SocketAddrV{4,6} layout

This code assumes that Rust's std::net::{SocketAddrV4, SocketAddrV6} are layout compatible with sockaddr:

nb-connect/src/lib.rs

Lines 61 to 84 in f706c11

impl Addr {
/// Creates a raw socket address from `SocketAddr`.
fn new(addr: SocketAddr) -> Self {
let (addr, len): (*const sockaddr, socklen_t) = match &addr {
SocketAddr::V4(addr) => (addr as *const _ as *const _, mem::size_of_val(addr) as _),
SocketAddr::V6(addr) => (addr as *const _ as *const _, mem::size_of_val(addr) as _),
};
unsafe { Self::from_raw_parts(addr, len) }
}
/// Creates an `Addr` from its raw parts.
unsafe fn from_raw_parts(addr: *const sockaddr, len: socklen_t) -> Self {
let mut storage = MaybeUninit::<sockaddr_storage>::uninit();
ptr::copy_nonoverlapping(
addr as *const _ as *const u8,
&mut storage as *mut _ as *mut u8,
len as usize,
);
Self {
storage: storage.assume_init(),
len,
}
}
}

This is not guaranteed by the standard library, see rust-lang/rust#78802 for more details.

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