network_search 0.1.0

the tools which is useful for searching networks
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pub mod icmp{
    use pnet::packet::icmp::IcmpTypes;
    use pnet::packet::icmp::echo_request::{MutableEchoRequestPacket, IcmpCodes};

    pub fn make_icmp_echo_packet(icmp: &mut MutableEchoRequestPacket) {
        icmp.set_icmp_type(IcmpTypes::EchoRequest);
        icmp.set_icmp_code(IcmpCodes::NoCode);
        icmp.set_checksum(0);
        icmp.set_identifier(1);
        icmp.set_sequence_number(1);
    }

    pub fn checksum(data: &[u8]) -> u16 {
        let mut sum: u32 = 0;
        let mut s = data.len();
        for i in 0..s / 2 {
          sum += ( ( (data[i*2+1] as u16) << 8) + data[i*2] as u16) as u32;
          s -= 2;
          if sum & 0x80000000 == 1 {
            sum = (sum >> 16) + (sum & 0xffff);
          }
        }
      
        if s == 1 {
          sum += data[data.len()-1] as u32;
        }
      
        while sum >> 16 > 1 {
          sum = (sum >> 16) + (sum & 0xffff);
        }
      
        sum = (sum >> 8) + ( (sum << 8) & 0xff00);
      
        !sum as u16
    }
}