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// Syd: rock-solid application kernel
// src/kernel/net/getsockname.rs: getsockname(2) handler
//
// Copyright (c) 2023, 2024, 2025, 2026 Ali Polatel <alip@chesswob.org>
//
// SPDX-License-Identifier: GPL-3.0
use libseccomp::ScmpNotifResp;
use nix::errno::Errno;
use crate::{
confine::is_valid_ptr, fd::fd_inode, ip::SockInfo, req::UNotifyEventRequest,
unix::unix_addr_bytes,
};
pub(crate) fn handle_getsockname(
request: &UNotifyEventRequest,
sock: SockInfo,
args: &[u64; 6],
) -> Result<ScmpNotifResp, Errno> {
// Get socket inode.
let inode = fd_inode(sock.fd())?;
drop(sock); // Close our copy of socket.
// Lookup bind(2) path by inode in sandbox unix map.
let addr = if let Some(addr) = request.get_unix(inode).and_then(|unix| unix.addr) {
addr
} else {
// Not a UNIX domain socket, continue.
// SAFETY: No pointer-dereference in access check.
return unsafe { Ok(request.continue_syscall()) };
};
// Determine address length.
let addrlen = if args[2] != 0 {
const SIZEOF_SOCKLEN_T: usize = size_of::<libc::socklen_t>();
let mut buf = [0u8; SIZEOF_SOCKLEN_T];
if request.read_mem(&mut buf, args[2], SIZEOF_SOCKLEN_T)? == SIZEOF_SOCKLEN_T {
// libc defines socklen_t as u32.
// Linux rejects negative length.
let len = i32::from_ne_bytes(buf);
libc::socklen_t::try_from(len).or(Err(Errno::EINVAL))?
} else {
// Linux returns EFAULT for invalid address length pointer.
return Err(Errno::EFAULT);
}
} else {
// addrlen must not be NULL.
return Err(Errno::EFAULT);
};
// Linux writes address length before address.
//
// Convert address length into a vector of bytes.
let (addr_buf, addr_len) = unix_addr_bytes(&addr);
let buf = addr_len.to_ne_bytes();
// Write address length into memory.
request.write_mem_all(&buf, args[2])?;
// Linux doesn't dereference address for zero length.
if addrlen > 0 && !is_valid_ptr(args[1], request.scmpreq.data.arch) {
return Err(Errno::EFAULT);
}
// Write the truncated socket address into memory.
let len = addr_len.min(addrlen) as usize;
request.write_mem_all(&addr_buf[..len], args[1])?;
Ok(request.return_syscall(0))
}