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write_tcp.rs
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use etherparse::*;
fn main() {
//setup the packet headers
let builder = PacketBuilder::ethernet2(
[1, 2, 3, 4, 5, 6], //source mac
[7, 8, 9, 10, 11, 12], //destination mac
)
.ipv4(
[192, 168, 1, 1], //source ip
[192, 168, 1, 2], //destination ip
20, //time to life
)
.tcp(
21, //source port
1234, //desitnation port
1, //sequence number
26180, //window size
)
//set additional tcp header fields
//supported flags: ns(), fin(), syn(), rst(), psh(), ece(), cwr()
.ns() //set the ns flag
.ack(123) //ack flag + the ack number
.urg(23) //urg flag + urgent pointer
//tcp header options
.options(&[
TcpOptionElement::Noop,
TcpOptionElement::MaximumSegmentSize(1234),
])
.unwrap();
//payload of the tcp packet
let payload = [1, 2, 3, 4, 5, 6, 7, 8];
//get some memory to store the result
let mut result = Vec::<u8>::with_capacity(builder.size(payload.len()));
//serialize
//this will automatically set all length fields, checksums and identifiers (ethertype & protocol)
builder.write(&mut result, &payload).unwrap();
println!("{:?}", result);
}