ipv4builder.rs

/// Building a Ipv4Header struct
///
/// Ipv4Header has the same byte representation as `struct ip` in C. The
/// builder pattern provides a better interface for dealing with byte order
/// specific unions. It also means we can use types like `Ipv4Addr` instead
/// of `c::in_addr`.
let ip: Ipv4Header = Ipv4HeaderBuilder::new() // sets version and internet header length (ihl)
    .tos(Tos::low_delay())
    .data_length(::std::mem::size_of::<CarpHeader>()) // calculates proper total length
    .random_id()
    .flags(Flags::dont_fragment())
    .ttl(255)
    .protocol(Protocol::Carp)
    .source_address(FromStr::from_str("10.0.0.2").unwrap())
    .destination_address(FromStr::from_str("10.0.0.3").unwrap())
    .build();