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somewhat wip sniffing

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zedddie 2026-03-15 17:17:24 +01:00 • committed by tuturuu
parent 59a17c5475
commit 891a76eaf5
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GPG key ID: B352C3C2894405A7
3 changed files with 22 additions and 18 deletions
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29
src/sniffing/headers.rs
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@ -3,6 +3,7 @@ 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
@ -10,7 +11,8 @@ enum Protocol {
type Ipv4 = [u8; 4];
type Ipv6 = [u8; 16];
type Port = u16;
enum PacketInfo {
#[derive(Debug)]
pub enum PacketInfo {
// <https://www.geeksforgeeks.org/computer-networks/what-is-ipv4/>
V4 {
src_ip: Ipv4,
@ -29,37 +31,38 @@ enum PacketInfo {
}
}
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 => {
PacketInfo::V4{
src_ip: packet[12..16],
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],
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,
_ => return Err(format!("unsuppiorted protocol: {p}").into())
p => return Err(format!("unsuppiorted protocol: {p}").into())
}
}
})
},
6 => {
PacketInfo::V6{
src_ip: packet[8..24],
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],
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,
_ => return Err(format!("unsuppiorted protocol: {p}").into())
p => return Err(format!("unsuppiorted protocol: {p}").into())
}
}
})
},
ver => {
panic!("unexpected packet ver: {ver}");
Error
Err(format!("unsuppiorted ver: {ver}").into())
}
}
}