1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
// Copyright 2017 Sopium
// This file is part of WireGuard.rs.
// WireGuard.rs is free software: you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
// WireGuard.rs is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with WireGuard.rs. If not, see <https://www.gnu.org/licenses/>.
extern crate pnet;
use self::pnet::packet::ipv4::Ipv4Packet;
use self::pnet::packet::ipv6::Ipv6Packet;
use std::net::IpAddr;
// IP packet parsing.
/// Parses IPv4/v6 packet, returns total length, source, destination.
pub fn parse_ip_packet(packet: &[u8]) -> Result<(u16, IpAddr, IpAddr), ()> {
if packet.len() < 20 {
return Err(());
}
let v = packet[0] >> 4;
if v == 4 {
// IPv4.
let p = Ipv4Packet::new(packet).ok_or(())?;
let len = p.get_total_length();
let src = p.get_source();
let dst = p.get_destination();
Ok((len, IpAddr::V4(src), IpAddr::V4(dst)))
} else if v == 6 {
// IPv6.
let p = Ipv6Packet::new(packet).ok_or(())?;
let len = p.get_payload_length() + 40;
let src = p.get_source();
let dst = p.get_destination();
Ok((len, IpAddr::V6(src), IpAddr::V6(dst)))
} else {
Err(())
}
}
|
