| #![allow(unsafe_code)] |
| |
| use crate::backend::io::syscalls::ioctl; |
| use crate::fd::AsFd; |
| use crate::io; |
| use core::slice; |
| use core::str; |
| use linux_raw_sys::ctypes::c_char; |
| use linux_raw_sys::ioctl::SIOCGIFINDEX; |
| #[cfg(feature = "alloc")] |
| use linux_raw_sys::ioctl::SIOCGIFNAME; |
| use linux_raw_sys::net::{ifreq, ifreq__bindgen_ty_1, ifreq__bindgen_ty_2, IFNAMSIZ}; |
| #[cfg(feature = "alloc")] |
| use {alloc::borrow::ToOwned, alloc::string::String}; |
| |
| pub(crate) fn name_to_index(fd: impl AsFd, if_name: &str) -> io::Result<u32> { |
| let if_name_bytes = if_name.as_bytes(); |
| if if_name_bytes.len() >= IFNAMSIZ as usize { |
| return Err(io::Errno::NODEV); |
| } |
| if if_name_bytes.contains(&0) { |
| return Err(io::Errno::NODEV); |
| } |
| |
| // SAFETY: Convert `&[u8]` to `&[c_char]`. |
| let if_name_bytes = unsafe { |
| slice::from_raw_parts(if_name_bytes.as_ptr().cast::<c_char>(), if_name_bytes.len()) |
| }; |
| |
| let mut ifreq = ifreq { |
| ifr_ifrn: ifreq__bindgen_ty_1 { ifrn_name: [0; 16] }, |
| ifr_ifru: ifreq__bindgen_ty_2 { ifru_ivalue: 0 }, |
| }; |
| unsafe { ifreq.ifr_ifrn.ifrn_name[..if_name_bytes.len()].copy_from_slice(if_name_bytes) }; |
| |
| unsafe { ioctl(fd.as_fd(), SIOCGIFINDEX, &mut ifreq as *mut ifreq as _) }?; |
| let index = unsafe { ifreq.ifr_ifru.ifru_ivalue }; |
| Ok(index as u32) |
| } |
| |
| #[cfg(feature = "alloc")] |
| pub(crate) fn index_to_name(fd: impl AsFd, index: u32) -> io::Result<String> { |
| let mut ifreq = ifreq { |
| ifr_ifrn: ifreq__bindgen_ty_1 { ifrn_name: [0; 16] }, |
| ifr_ifru: ifreq__bindgen_ty_2 { |
| ifru_ivalue: index as _, |
| }, |
| }; |
| |
| unsafe { ioctl(fd.as_fd(), SIOCGIFNAME, &mut ifreq as *mut ifreq as _) }?; |
| |
| if let Some(nul_byte) = unsafe { ifreq.ifr_ifrn.ifrn_name } |
| .iter() |
| .position(|ch| *ch == 0) |
| { |
| let ifrn_name = unsafe { &ifreq.ifr_ifrn.ifrn_name[..nul_byte] }; |
| |
| // SAFETY: Convert `&[c_char]` to `&[u8]`. |
| let ifrn_name = |
| unsafe { slice::from_raw_parts(ifrn_name.as_ptr().cast::<u8>(), ifrn_name.len()) }; |
| |
| str::from_utf8(ifrn_name) |
| .map_err(|_| io::Errno::ILSEQ) |
| .map(ToOwned::to_owned) |
| } else { |
| Err(io::Errno::INVAL) |
| } |
| } |