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use tun::Error;
// Here we will recieve bytes and try to get their destanation & apply Rules for them.
use crate::config::Config;
#[derive(Debug)]
enum Protocol {
TCP,
UDP
}
type Ipv4 = [u8; 4];
type Ipv6 = [u8; 16];
type Port = u16;
#[derive(Debug)]
pub enum PacketInfo {
// <https://www.geeksforgeeks.org/computer-networks/what-is-ipv4/>
V4 {
src_ip: Ipv4,
src_port: Port,
dst_ip: Ipv4,
dst_port: Port,
protocol: Protocol
},
// <https://www.geeksforgeeks.org/computer-networks/internet-protocol-version-6-ipv6-header/>
V6 {
src_ip: Ipv6,
src_port: Port,
dst_ip: Ipv6,
dst_port: Port,
protocol: Protocol
}
}
pub fn sniff_raw_packets(packet: &[u8]) -> Result<PacketInfo, Box<dyn std::error::Error + Send + Sync + 'static>> {
println!("something");
let ver = packet[0] >> 4;
dbg!(ver);
match ver {
4 => {
Ok(PacketInfo::V4{
src_ip: packet[12..16].try_into()?,
src_port: u16::from_be_bytes([packet[20], packet[21]]),
dst_ip: packet[16..20].try_into()?,
dst_port: u16::from_be_bytes([packet[22], packet[23]]),
protocol: match packet[9] {
6 => Protocol::TCP,
4 => Protocol::UDP,
p => return Err(format!("unsuppiorted protocol: {p}").into())
}
})
},
6 => {
Ok(PacketInfo::V6{
src_ip: packet[8..24].try_into()?,
src_port: u16::from_be_bytes([packet[40], packet[41]]),
dst_ip: packet[24..40].try_into()?,
dst_port: u16::from_be_bytes([packet[42], packet[43]]),
protocol: match packet[6] {
6 => Protocol::TCP,
4 => Protocol::UDP,
p => return Err(format!("unsuppiorted protocol: {p}").into())
}
})
},
ver => {
Err(format!("unsuppiorted ver: {ver}").into())
}
}
}
pub fn apply_rules(config: Config, pinfo: PacketInfo) {
todo!()
}
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