Method get_mac_addr

net_util/src/tap.rs:396–419

Get mac addr for tap interface.

(&self)

    /// Get mac addr for tap interface.
    pub fn get_mac_addr(&self) -> Result<MacAddr> {
        let sock = create_unix_socket().map_err(Error::NetUtil)?;

        let ifreq = self.get_ifreq();

        // SAFETY: ioctl is safe. Called with a valid sock fd, and we check the return.
        unsafe { Self::ioctl_with_ref(&sock, libc::SIOCGIFHWADDR as c_ulong, &ifreq)? };

        let addr = {
            let bytes: Vec<u8> =
                // SAFETY: The `ioctl_with_ref` ensures accessing `ifru_hwaddr` is valid.
                unsafe { ifreq.ifr_ifru.ifru_hwaddr.sa_data[0..MAC_ADDR_LEN].iter() }
                    .map(|byte| {
                        // On some architectures, `c_char` is already a `u8`.
                        #[allow(clippy::unnecessary_cast)]
                        {
                            *byte as u8
                        }
                    })
                    .collect();
            MacAddr::from_bytes(&bytes).map_err(Error::MacParsing)?
        };
        Ok(addr)
    }

    #[cfg(not(fuzzing))]
    pub fn mtu(&self) -> Result<i32> {