Function pnet_send_packet

net_util/src/tap.rs:676–689

Sends a test packet on the interface named "ifname".

(ifname: &str)

    // Sends a test packet on the interface named "ifname".
    fn pnet_send_packet(ifname: &str) {
        let payload = DATA_STRING.as_bytes();

        // eth hdr + ip hdr + udp hdr + payload len
        let buf_size = 14 + 20 + 8 + payload.len();

        let (mac, mut tx, _) = pnet_get_mac_tx_rx(ifname);

        let res = tx.build_and_send(1, buf_size, &mut |buf| {
            pnet_build_packet(buf, mac, payload);
        });
        // Make sure build_and_send() -> Option<io::Result<()>> succeeds.
        res.unwrap().unwrap();
    }

    // For a given interface name, this returns a tuple that contains the MAC address of the
    // interface, an object that can be used to send Ethernet frames, and a receiver of