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|
use tun::Error;
use std::fmt;
// Here we will recieve bytes and try to get their destanation & apply Rules for them.
use crate::config::Config;
#[derive(Debug, PartialEq)]
pub enum Protocol {
TCP,
UDP,
Unsupported(u8)
}
type SourceV4Ip = Ipv4;
type SourceV6Ip = Ipv6;
#[derive(PartialEq, Debug)]
pub enum IpVersion {
V4,
V6
}
type Ipv4 = [u8; 4];
type Ipv6 = [u16; 8];
type Port = u16;
#[derive(Debug, PartialEq)]
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,
dns: bool
},
// <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,
dns: bool
}
}
impl fmt::Display for PacketInfo {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.version() == &IpVersion::V4 {
let src_ip = self.src_ipv4_ip().unwrap();
let dst_ip = self.dst_ipv4_ip().unwrap();
write!(f, "{:?} {}.{}.{}.{}:{} -> {}.{}.{}.{}:{} {:?} is dns? {:?}", self.version(), src_ip[0], src_ip[1], src_ip[2], src_ip[3], self.src_port(), dst_ip[0], dst_ip[1], dst_ip[2], dst_ip[3], self.dst_port(), self.protocol(), self.dns())
} else {
let src_ip = self.src_ipv6_ip().unwrap();
let dst_ip = self.dst_ipv6_ip().unwrap();
// y:y:y:y:y:y:y:y = 8 hexademical
write!(f, "{:?} {}:{}:{}:{}:{}:{}:{}:{} port:{} -> {}:{}:{}:{}:{}:{}:{}:{} port:{} {:?} is dns? {:?}", self.version(), src_ip[0], src_ip[1], src_ip[2], src_ip[3], src_ip[4], src_ip[5], src_ip[6], src_ip[7], self.src_port(), dst_ip[0], dst_ip[1], dst_ip[2], dst_ip[3], dst_ip[4], dst_ip[5], dst_ip[6], dst_ip[7], self.dst_port(), self.protocol(), self.dns())
}
}
}
impl PacketInfo {
pub fn dns(&self) -> &bool {
match self {
PacketInfo::V4 { dns, ..} => dns,
PacketInfo::V6 { dns, ..} => dns,
}
}
pub fn src_ipv6_ip(&self) -> Option<&SourceV6Ip> {
match self {
PacketInfo::V6 { src_ip, .. } => Some(src_ip),
_ => None
}
}
pub fn dst_ipv6_ip(&self) -> Option<&SourceV6Ip> {
match self {
PacketInfo::V6 { dst_ip, .. } => Some(dst_ip),
_ => None
}
}
pub fn src_ipv4_ip(&self) -> Option<&SourceV4Ip> {
match self {
PacketInfo::V4 { src_ip, .. } => Some(src_ip),
_ => None,
}
}
pub fn dst_ipv4_ip(&self) -> Option<&SourceV4Ip> {
match self {
PacketInfo::V4 { dst_ip, .. } => Some(dst_ip),
_ => None
}
}
pub fn src_port(&self) -> &Port {
match self {
PacketInfo::V4 { src_port, .. } => src_port,
PacketInfo::V6 { src_port, .. } => src_port
}
}
pub fn dst_port(&self) -> &Port {
match self {
PacketInfo::V4 { dst_port, .. } => dst_port,
PacketInfo::V6 { dst_port, .. } => dst_port
}
}
pub fn version(&self) -> &IpVersion {
match self {
PacketInfo::V4 { .. }=> &IpVersion::V4,
PacketInfo::V6 { .. }=> &IpVersion::V6
}
}
pub fn protocol(&self) -> &Protocol {
match self {
PacketInfo::V4 { protocol, .. } => protocol,
PacketInfo::V6 { protocol, .. } => protocol,
}
}
}
// TODO: move these to some appropriate file for code readability.
type GenericError = Box<dyn std::error::Error + Send + Sync + 'static>;
type SniffedPacket = Result<PacketInfo, Box<dyn std::error::Error + Send + Sync + 'static>>;
type Packet = [u8];
pub fn sniff_raw_packets(packet: &Packet) -> SniffedPacket {
let ver = packet[0] >> 4;
match ver {
4 => {
// Internet Header Length (IHL).
let ihl = (packet[0] & 0x0F) as usize * 4;
let dst_port = Port::from_be_bytes([packet[ihl+2], packet[ihl+3]]);
let dns;
if dst_port == 53 { dns = true; } else { dns = false; };
let v4 = PacketInfo::V4{
src_ip: <Ipv4>::try_from(&packet[12..16])?,
src_port: Port::from_be_bytes([packet[ihl], packet[ihl+1]]),
dst_ip: <Ipv4>::try_from(&packet[16..20])?,
dst_port,
protocol: match packet[9] {
6 => Protocol::TCP,
17 => Protocol::UDP,
p => Protocol::Unsupported(p)
},
dns
};
if !matches!(v4.protocol(), Protocol::Unsupported(_)) {
println!("{v4}");
} else {
// TODO: make --debug option which will include this diagnostic, for general use this
// should be off
// println!("oppsie unsupported protocol: {:?}", v4.protocol());
}
Ok(v4)
},
6 => {
// FIXME: fix ipv6 type representation to u16 paired u8
let src_ip_bytes = &packet[8..24];
let src_ip = src_ip_bytes.chunks(2).map(|b| u16::from_be_bytes(b[0], b[1]));
let dst_port = Port::from_be_bytes([packet[42], packet[43]]);
let dns;
if dst_port == 53 { dns = true; } else { dns = false; };
let v6 = PacketInfo::V6{
src_ip,
src_port: Port::from_be_bytes([packet[40], packet[41]]),
dst_ip: <Ipv6>::try_from(&packet[24..40])?,
dst_port,
protocol: match packet[6] {
6 => Protocol::TCP,
17 => Protocol::UDP,
p => Protocol::Unsupported(p)
},
dns
};
if !matches!(v6.protocol(), Protocol::Unsupported(_)) {
println!("{v6}");
} else {
// TODO: make --debug option which will include this diagnostic, for general use this
// should be off
// println!("oppsie unsupported protocol: {:?}", v6.protocol());
}
Ok(v6)
},
ver => {
Err(format!("unsuppiorted ver: {ver}").into())
}
}
}
pub fn apply_rules(config: Config, pinfo: PacketInfo) {
todo!()
}
|
