Struct cross_socket::packet::tcp::TcpPacket

source ·

pub struct TcpPacket {
    pub source: u16,
    pub destination: u16,
    pub sequence: u32,
    pub acknowledgement: u32,
    pub data_offset: u8,
    pub reserved: u8,
    pub flags: Vec<TcpFlag>,
    pub window: u16,
    pub checksum: u16,
    pub urgent_ptr: u16,
    pub options: Vec<TcpOption>,
    pub payload: Vec<u8>,
}

Expand description

Represents a TCP packet.

Fields§

§source: u16§destination: u16§sequence: u32§acknowledgement: u32§data_offset: u8§reserved: u8§flags: Vec<TcpFlag>§window: u16§checksum: u16§urgent_ptr: u16§options: Vec<TcpOption>§payload: Vec<u8>

Implementations§

source §

impl TcpPacket

source

pub fn from_bytes(packet: &[u8]) -> TcpPacket

Examples found in repository ?

examples/datalink_socket/tcp_ping.rs (line 49)

fn main() {
    let interface: Interface = cross_socket::interface::get_default_interface().unwrap();
    // Create new socket
    let mut socket: DataLinkSocket = DataLinkSocket::new(interface, false).unwrap();
    // Create packet info
    let mut packet_info = PacketInfo::new();
    packet_info.src_mac = socket.interface.mac_addr.clone().unwrap();
    packet_info.dst_mac = socket.interface.gateway.clone().unwrap().mac_addr;
    packet_info.ether_type = EtherType::Ipv4;
    packet_info.src_ip = IpAddr::V4(socket.interface.ipv4[0].addr);
    packet_info.dst_ip = IpAddr::V4(std::net::Ipv4Addr::new(1, 1, 1, 1));
    packet_info.src_port = Some(53443);
    packet_info.dst_port = Some(80);
    packet_info.ip_protocol = Some(IpNextLevelProtocol::Tcp);
    packet_info.payload = vec![0; 0];

    // Send TCP SYN packets to 1.1.1.1:80
    match socket.send(packet_info) {
        Ok(packet_len) => {
            println!("Sent {} bytes", packet_len);
        }
        Err(e) => {
            println!("Error: {}", e);
        }
    }

    // Receive packets
    println!("Waiting for TCP SYN+ACK... ");
    loop {
        match socket.receive() {
            Ok(packet) => {
                let ethernet_packet = cross_socket::packet::ethernet::EthernetPacket::from_bytes(&packet);
                if ethernet_packet.ethertype != EtherType::Ipv4 {
                    continue;
                }
                let ip_packet = cross_socket::packet::ipv4::Ipv4Packet::from_bytes(&ethernet_packet.payload);
                if ip_packet.next_level_protocol != IpNextLevelProtocol::Tcp || ip_packet.source != std::net::Ipv4Addr::new(1, 1, 1, 1) {
                    continue;
                }
                println!("Received {} bytes from {}", packet.len(), ip_packet.source);
                let tcp_packet = cross_socket::packet::tcp::TcpPacket::from_bytes(&ip_packet.payload);
                println!("Packet: {:?}", tcp_packet);
                break;
            }
            Err(e) => {
                println!("Error: {}", e);
            }
        }
    }
    
}

More examples

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examples/socket/tcp.rs (line 69)

fn main() {
    let interface: Interface = cross_socket::interface::get_default_interface().unwrap();
    let src_ip: IpAddr = IpAddr::V4(interface.ipv4[0].addr);
    let src_socket_addr: SocketAddr = SocketAddr::new(src_ip, 53443);
    let dst_ip: IpAddr = IpAddr::V4(Ipv4Addr::new(1, 1, 1, 1));
    let dst_socket_addr: SocketAddr = SocketAddr::new(dst_ip, 80);
    let socket_option = SocketOption {
        ip_version: IpVersion::V4,
        socket_type: SocketType::Raw,
        protocol: Some(IpNextLevelProtocol::Tcp),
        timeout: None,
        ttl: None,
        non_blocking: false,
    };
    // Sender socket
    let socket: Socket = Socket::new(socket_option).unwrap();

    // Receiver socket
    // RAW SOCKET recvfrom not working for TCP. So we use DataLinkSocket instead.
    let mut listener_socket: DataLinkSocket = DataLinkSocket::new(interface, false).unwrap();

    // Create packet info
    let mut packet_info = PacketInfo::new();
    packet_info.src_ip = src_socket_addr.ip();
    packet_info.dst_ip = dst_socket_addr.ip();
    packet_info.src_port = Some(src_socket_addr.port());
    packet_info.dst_port = Some(dst_socket_addr.port());
    packet_info.ip_protocol = Some(IpNextLevelProtocol::Tcp);
    packet_info.payload = vec![0; 0];

    // Build TCP SYN packet
    let tcp_packet = cross_socket::packet::builder::build_tcp_syn_packet(packet_info);

    // Send TCP SYN packet to 1.1.1.1
    match socket.send_to(&tcp_packet, dst_socket_addr) {
        Ok(packet_len) => {
            println!("Sent {} bytes", packet_len);
        }
        Err(e) => {
            println!("Error: {}", e);
        }
    }

    // Receive packets
    println!("Waiting for TCP SYN+ACK... ");
    loop {
        match listener_socket.receive() {
            Ok(packet) => {
                let ethernet_packet = cross_socket::packet::ethernet::EthernetPacket::from_bytes(&packet);
                if ethernet_packet.ethertype != EtherType::Ipv4 {
                    continue;
                }
                let ip_packet = cross_socket::packet::ipv4::Ipv4Packet::from_bytes(&ethernet_packet.payload);
                if ip_packet.next_level_protocol != IpNextLevelProtocol::Tcp || ip_packet.source != std::net::Ipv4Addr::new(1, 1, 1, 1) {
                    continue;
                }
                println!("Received {} bytes from {}", packet.len(), ip_packet.source);
                let tcp_packet = cross_socket::packet::tcp::TcpPacket::from_bytes(&ip_packet.payload);
                println!("Packet: {:?}", tcp_packet);
                break;
            }
            Err(e) => {
                println!("Error: {}", e);
            }
        }
    }
}