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use super::*;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum InternetSlice<'a> {
/// The ipv6 header & the decoded extension headers.
Ipv4(Ipv4HeaderSlice<'a>, Ipv4ExtensionsSlice<'a>),
/// The ipv6 header & the decoded extension headers.
Ipv6(Ipv6HeaderSlice<'a>, Ipv6ExtensionsSlice<'a>),
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum TransportSlice<'a> {
///A slice containing an UDP header.
Udp(UdpHeaderSlice<'a>),
///A slice containing a TCP header.
Tcp(TcpHeaderSlice<'a>),
///Unknonwn transport layer protocol. The value is the last parsed ip protocol number.
Unknown(u8),
}
///A sliced into its component headers. Everything that could not be parsed is stored in a slice in the field "payload".
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct SlicedPacket<'a> {
pub link: Option<LinkSlice<'a>>,
pub vlan: Option<VlanSlice<'a>>,
pub ip: Option<InternetSlice<'a>>,
/// IP Extension headers present after the ip header.
///
/// In case of IPV4 these can be ipsec authentication & encapsulated
/// security headers. In case of IPv6 these are the ipv6 extension headers.
/// The headers are in the same order as they are written to the packet.
//pub ip_extensions: [Option<IpExtensionHeaderSlice<'a>>;IP_MAX_NUM_HEADER_EXTENSIONS],
pub transport: Option<TransportSlice<'a>>,
/// The payload field points to the rest of the packet that could not be parsed by etherparse.
///
/// Depending on what other fields contain a "Some" values the payload contains the corresponding
/// payload.
///
/// For example if transport field contains Some(Udp(_)) then the payload field points to the udp payload.
/// On the other hand if the transport field contains None then the payload contains the payload of
/// next field containing a Some value (in order of transport, ip, vlan, link).
pub payload: &'a [u8]
}
const ETH_IPV4: u16 = EtherType::Ipv4 as u16;
const ETH_IPV6: u16 = EtherType::Ipv6 as u16;
const ETH_VLAN: u16 = EtherType::VlanTaggedFrame as u16;
const ETH_BRIDGE: u16 = EtherType::ProviderBridging as u16;
const ETH_VLAN_DOUBLE: u16 = EtherType::VlanDoubleTaggedFrame as u16;
impl<'a> SlicedPacket<'a> {
/// Seperates a network packet slice into different slices containing the headers from the ethernet header downwards.
///
/// The result is returned as a SlicerPacket struct. This function assumes the given data starts
/// with an ethernet II header.
///
/// # Examples
///
/// Basic usage:
///
///```
/// # use etherparse::{SlicedPacket, PacketBuilder};
/// # let builder = PacketBuilder::
/// # ethernet2([1,2,3,4,5,6], //source mac
/// # [7,8,9,10,11,12]) //destionation mac
/// # .ipv4([192,168,1,1], //source ip
/// # [192,168,1,2], //desitionation ip
/// # 20) //time to life
/// # .udp(21, //source port
/// # 1234); //desitnation port
/// # //payload of the udp packet
/// # let payload = [1,2,3,4,5,6,7,8];
/// # //get some memory to store the serialized data
/// # let mut packet = Vec::<u8>::with_capacity(
/// # builder.size(payload.len()));
/// # builder.write(&mut packet, &payload).unwrap();
/// match SlicedPacket::from_ethernet(&packet) {
/// Err(value) => println!("Err {:?}", value),
/// Ok(value) => {
/// println!("link: {:?}", value.link);
/// println!("vlan: {:?}", value.vlan);
/// println!("ip: {:?}", value.ip);
/// println!("transport: {:?}", value.transport);
/// }
/// }
/// ```
pub fn from_ethernet(data: &'a [u8]) -> Result<SlicedPacket, ReadError> {
CursorSlice::new(data).slice_ethernet2()
}
/// Seperates a network packet slice into different slices containing the headers from the ip header downwards.
///
/// The result is returned as a SlicerPacket struct. This function assumes the given data starts
/// with an IPv4 or IPv6 header.
///
/// # Examples
///
/// Basic usage:
///
///```
/// # use etherparse::{SlicedPacket, PacketBuilder};
/// # let builder = PacketBuilder::
/// # ipv4([192,168,1,1], //source ip
/// # [192,168,1,2], //desitionation ip
/// # 20) //time to life
/// # .udp(21, //source port
/// # 1234); //desitnation port
/// # //payload of the udp packet
/// # let payload = [1,2,3,4,5,6,7,8];
/// # //get some memory to store the serialized data
/// # let mut packet = Vec::<u8>::with_capacity(
/// # builder.size(payload.len()));
/// # builder.write(&mut packet, &payload).unwrap();
/// match SlicedPacket::from_ip(&packet) {
/// Err(value) => println!("Err {:?}", value),
/// Ok(value) => {
/// //link & vlan fields are empty when parsing from ip downwards
/// assert_eq!(None, value.link);
/// assert_eq!(None, value.vlan);
///
/// //ip & transport (udp or tcp)
/// println!("ip: {:?}", value.ip);
/// println!("transport: {:?}", value.transport);
/// }
/// }
/// ```
pub fn from_ip(data: &'a [u8]) -> Result<SlicedPacket, ReadError> {
CursorSlice::new(data).slice_ip()
}
}
///Helper class for slicing packets
struct CursorSlice<'a> {
pub slice: &'a [u8],
pub offset: usize,
pub result: SlicedPacket<'a>
}
impl<'a> CursorSlice<'a> {
pub fn new(slice: &'a [u8]) -> CursorSlice<'a> {
CursorSlice {
offset: 0,
slice,
result: SlicedPacket {
link: None,
vlan: None,
ip: None,
transport: None,
payload: slice
}
}
}
fn move_by_slice(&mut self, other: &'a[u8]) {
unsafe {
use std::slice::from_raw_parts;
self.slice = from_raw_parts(
self.slice.as_ptr().add(other.len()),
self.slice.len() - other.len()
);
}
self.offset += other.len();
}
fn move_to_slice(&mut self, other: &'a[u8]) {
self.offset += self.slice.len() - other.len();
self.slice = other;
}
pub fn slice_ethernet2(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::LinkSlice::*;
let result = Ethernet2HeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
//cache the ether_type for later
let ether_type = result.ether_type();
//set the new data
self.move_by_slice(result.slice());
self.result.link = Some(Ethernet2(result));
//continue parsing (if required)
match ether_type {
ETH_IPV4 => self.slice_ipv4(),
ETH_IPV6 => self.slice_ipv6(),
ETH_VLAN | ETH_BRIDGE | ETH_VLAN_DOUBLE => self.slice_vlan(),
_ => self.slice_payload()
}
}
pub fn slice_vlan(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::VlanSlice::*;
let single = SingleVlanHeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
//check if it is a double vlan header
let ether_type = single.ether_type();
match ether_type {
//in case of a double vlan header continue with the inner
ETH_VLAN | ETH_BRIDGE | ETH_VLAN_DOUBLE => self.slice_double_vlan(),
value => {
//set the vlan header and continue the normal parsing
self.move_by_slice(single.slice());
self.result.vlan = Some(SingleVlan(single));
match value {
ETH_IPV4 => self.slice_ipv4(),
ETH_IPV6 => self.slice_ipv6(),
_ => self.slice_payload()
}
}
}
}
pub fn slice_double_vlan(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::VlanSlice::*;
let result = DoubleVlanHeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
//cache ether_type for later
let ether_type = result.inner().ether_type();
//set the new data
self.move_by_slice(result.slice());
self.result.vlan = Some(DoubleVlan(result));
//continue parsing (if required)
match ether_type {
ETH_IPV4 => self.slice_ipv4(),
ETH_IPV6 => self.slice_ipv6(),
_ => self.slice_payload()
}
}
pub fn slice_ip(self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::ReadError::*;
if self.slice.is_empty() {
Err(UnexpectedEndOfSlice(self.offset + 1))
} else {
match self.slice[0] >> 4 {
4 => self.slice_ipv4(),
6 => self.slice_ipv6(),
version => Err(IpUnsupportedVersion(version))
}
}
}
pub fn slice_ipv4(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::InternetSlice::*;
let ip_header = Ipv4HeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
// move the slice
self.move_by_slice(ip_header.slice());
// slice extensions
let (ip_ext, protocol, rest) = Ipv4ExtensionsSlice::from_slice(ip_header.protocol(), self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
// set the new data
self.move_to_slice(rest);
self.result.ip = Some(Ipv4(ip_header, ip_ext));
match protocol {
ip_number::UDP => self.slice_udp(),
ip_number::TCP => self.slice_tcp(),
value => {
use TransportSlice::*;
self.result.transport = Some(Unknown(value));
self.slice_payload()
}
}
}
pub fn slice_ipv6(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::InternetSlice::*;
let ip = Ipv6HeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
//move the slice
self.move_by_slice(ip.slice());
//extension headers
let (ip_ext, next_header, rest) = Ipv6ExtensionsSlice::from_slice(ip.next_header(), self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
// set the new data
self.move_to_slice(rest);
self.result.ip = Some(Ipv6(ip, ip_ext));
//parse the data bellow
match next_header {
ip_number::UDP => self.slice_udp(),
ip_number::TCP => self.slice_tcp(),
value => {
use TransportSlice::*;
self.result.transport = Some(Unknown(value));
self.slice_payload()
}
}
}
pub fn slice_udp(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::TransportSlice::*;
let result = UdpHeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
//set the new data
self.move_by_slice(result.slice());
self.result.transport = Some(Udp(result));
//done
self.slice_payload()
}
pub fn slice_tcp(mut self) -> Result<SlicedPacket<'a>, ReadError> {
use crate::TransportSlice::*;
let result = TcpHeaderSlice::from_slice(self.slice)
.map_err(|err|
err.add_slice_offset(self.offset)
)?;
//set the new data
self.move_by_slice(result.slice());
self.result.transport = Some(Tcp(result));
//done
self.slice_payload()
}
pub fn slice_payload(mut self) -> Result<SlicedPacket<'a>, ReadError> {
self.result.payload = self.slice;
Ok(self.result)
}
}