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renet/src/wire/ipv4.rs

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use core::fmt;
use byteorder::{ByteOrder, NetworkEndian};
use crate::{Error, Result};
use crate::phy::ChecksumCapabilities;
use crate::wire::ip::{checksum, pretty_print_ip_payload};
pub use super::IpProtocol as Protocol;
/// Minimum MTU required of all links supporting IPv4. See [RFC 791 § 3.1].
///
/// [RFC 791 § 3.1]: https://tools.ietf.org/html/rfc791#section-3.1
// RFC 791 states the following:
//
// > Every internet module must be able to forward a datagram of 68
// > octets without further fragmentation... Every internet destination
// > must be able to receive a datagram of 576 octets either in one piece
// > or in fragments to be reassembled.
//
// As a result, we can assume that every host we send packets to can
// accept a packet of the following size.
pub const MIN_MTU: usize = 576;
/// A four-octet IPv4 address.
#[derive(Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Default)]
pub struct Address(pub [u8; 4]);
impl Address {
/// An unspecified address.
pub const UNSPECIFIED: Address = Address([0x00; 4]);
/// The broadcast address.
pub const BROADCAST: Address = Address([0xff; 4]);
/// All multicast-capable nodes
pub const MULTICAST_ALL_SYSTEMS: Address = Address([224, 0, 0, 1]);
/// All multicast-capable routers
pub const MULTICAST_ALL_ROUTERS: Address = Address([224, 0, 0, 2]);
/// Construct an IPv4 address from parts.
pub fn new(a0: u8, a1: u8, a2: u8, a3: u8) -> Address {
Address([a0, a1, a2, a3])
}
/// Construct an IPv4 address from a sequence of octets, in big-endian.
///
/// # Panics
/// The function panics if `data` is not four octets long.
pub fn from_bytes(data: &[u8]) -> Address {
let mut bytes = [0; 4];
bytes.copy_from_slice(data);
Address(bytes)
}
/// Return an IPv4 address as a sequence of octets, in big-endian.
pub fn as_bytes(&self) -> &[u8] {
&self.0
}
/// Query whether the address is an unicast address.
pub fn is_unicast(&self) -> bool {
!(self.is_broadcast() ||
self.is_multicast() ||
self.is_unspecified())
}
/// Query whether the address is the broadcast address.
pub fn is_broadcast(&self) -> bool {
self.0[0..4] == [255; 4]
}
/// Query whether the address is a multicast address.
pub fn is_multicast(&self) -> bool {
self.0[0] & 0xf0 == 224
}
/// Query whether the address falls into the "unspecified" range.
pub fn is_unspecified(&self) -> bool {
self.0[0] == 0
}
/// Query whether the address falls into the "link-local" range.
pub fn is_link_local(&self) -> bool {
self.0[0..2] == [169, 254]
}
/// Query whether the address falls into the "loopback" range.
pub fn is_loopback(&self) -> bool {
self.0[0] == 127
}
}
#[cfg(feature = "std")]
impl From<::std::net::Ipv4Addr> for Address {
fn from(x: ::std::net::Ipv4Addr) -> Address {
Address(x.octets())
}
}
#[cfg(feature = "std")]
impl From<Address> for ::std::net::Ipv4Addr {
fn from(Address(x): Address) -> ::std::net::Ipv4Addr {
x.into()
}
}
impl fmt::Display for Address {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let bytes = self.0;
write!(f, "{}.{}.{}.{}", bytes[0], bytes[1], bytes[2], bytes[3])
}
}
/// A specification of an IPv4 CIDR block, containing an address and a variable-length
/// subnet masking prefix length.
#[derive(Debug, Hash, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Default)]
pub struct Cidr {
address: Address,
prefix_len: u8,
}
impl Cidr {
/// Create an IPv4 CIDR block from the given address and prefix length.
///
/// # Panics
/// This function panics if the prefix length is larger than 32.
pub fn new(address: Address, prefix_len: u8) -> Cidr {
assert!(prefix_len <= 32);
Cidr { address, prefix_len }
}
/// Create an IPv4 CIDR block from the given address and network mask.
pub fn from_netmask(addr: Address, netmask: Address) -> Result<Cidr> {
let netmask = NetworkEndian::read_u32(&netmask.0[..]);
if netmask.leading_zeros() == 0 && netmask.trailing_zeros() == netmask.count_zeros() {
Ok(Cidr { address: addr, prefix_len: netmask.count_ones() as u8 })
} else {
Err(Error::Illegal)
}
}
/// Return the address of this IPv4 CIDR block.
pub fn address(&self) -> Address {
self.address
}
/// Return the prefix length of this IPv4 CIDR block.
pub fn prefix_len(&self) -> u8 {
self.prefix_len
}
/// Return the network mask of this IPv4 CIDR.
pub fn netmask(&self) -> Address {
if self.prefix_len == 0 {
return Address([0, 0, 0, 0]);
}
let number = 0xffffffffu32 << (32 - self.prefix_len);
let data = [
((number >> 24) & 0xff) as u8,
((number >> 16) & 0xff) as u8,
((number >> 8) & 0xff) as u8,
((number >> 0) & 0xff) as u8,
];
Address(data)
}
/// Return the broadcast address of this IPv4 CIDR.
pub fn broadcast(&self) -> Option<Address> {
let network = self.network();
if network.prefix_len == 31 || network.prefix_len == 32 {
return None;
}
let network_number = NetworkEndian::read_u32(&network.address.0[..]);
let number = network_number | 0xffffffffu32 >> network.prefix_len;
let data = [
((number >> 24) & 0xff) as u8,
((number >> 16) & 0xff) as u8,
((number >> 8) & 0xff) as u8,
((number >> 0) & 0xff) as u8,
];
Some(Address(data))
}
/// Return the network block of this IPv4 CIDR.
pub fn network(&self) -> Cidr {
let mask = self.netmask().0;
let network = [
self.address.0[0] & mask[0],
self.address.0[1] & mask[1],
self.address.0[2] & mask[2],
self.address.0[3] & mask[3],
];
Cidr { address: Address(network), prefix_len: self.prefix_len }
}
/// Query whether the subnetwork described by this IPv4 CIDR block contains
/// the given address.
pub fn contains_addr(&self, addr: &Address) -> bool {
// right shift by 32 is not legal
if self.prefix_len == 0 { return true }
let shift = 32 - self.prefix_len;
let self_prefix = NetworkEndian::read_u32(self.address.as_bytes()) >> shift;
let addr_prefix = NetworkEndian::read_u32(addr.as_bytes()) >> shift;
self_prefix == addr_prefix
}
/// Query whether the subnetwork described by this IPv4 CIDR block contains
/// the subnetwork described by the given IPv4 CIDR block.
pub fn contains_subnet(&self, subnet: &Cidr) -> bool {
self.prefix_len <= subnet.prefix_len && self.contains_addr(&subnet.address)
}
}
impl fmt::Display for Cidr {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}/{}", self.address, self.prefix_len)
}
}
/// A read/write wrapper around an Internet Protocol version 4 packet buffer.
#[derive(Debug, PartialEq, Clone)]
pub struct Packet<T: AsRef<[u8]>> {
buffer: T
}
mod field {
use crate::wire::field::*;
pub const VER_IHL: usize = 0;
pub const DSCP_ECN: usize = 1;
pub const LENGTH: Field = 2..4;
pub const IDENT: Field = 4..6;
pub const FLG_OFF: Field = 6..8;
pub const TTL: usize = 8;
pub const PROTOCOL: usize = 9;
pub const CHECKSUM: Field = 10..12;
pub const SRC_ADDR: Field = 12..16;
pub const DST_ADDR: Field = 16..20;
}
impl<T: AsRef<[u8]>> Packet<T> {
/// Imbue a raw octet buffer with IPv4 packet structure.
pub fn new_unchecked(buffer: T) -> Packet<T> {
Packet { buffer }
}
/// Shorthand for a combination of [new_unchecked] and [check_len].
///
/// [new_unchecked]: #method.new_unchecked
/// [check_len]: #method.check_len
pub fn new_checked(buffer: T) -> Result<Packet<T>> {
let packet = Self::new_unchecked(buffer);
packet.check_len()?;
Ok(packet)
}
/// Ensure that no accessor method will panic if called.
/// Returns `Err(Error::Truncated)` if the buffer is too short.
/// Returns `Err(Error::Malformed)` if the header length is greater
/// than total length.
///
/// The result of this check is invalidated by calling [set_header_len]
/// and [set_total_len].
///
/// [set_header_len]: #method.set_header_len
/// [set_total_len]: #method.set_total_len
pub fn check_len(&self) -> Result<()> {
let len = self.buffer.as_ref().len();
if len < field::DST_ADDR.end {
Err(Error::Truncated)
} else if len < self.header_len() as usize {
Err(Error::Truncated)
} else if self.header_len() as u16 > self.total_len() {
Err(Error::Malformed)
} else if len < self.total_len() as usize {
Err(Error::Truncated)
} else {
Ok(())
}
}
/// Consume the packet, returning the underlying buffer.
pub fn into_inner(self) -> T {
self.buffer
}
/// Return the version field.
#[inline]
pub fn version(&self) -> u8 {
let data = self.buffer.as_ref();
data[field::VER_IHL] >> 4
}
/// Return the header length, in octets.
#[inline]
pub fn header_len(&self) -> u8 {
let data = self.buffer.as_ref();
(data[field::VER_IHL] & 0x0f) * 4
}
/// Return the Differential Services Code Point field.
pub fn dscp(&self) -> u8 {
let data = self.buffer.as_ref();
data[field::DSCP_ECN] >> 2
}
/// Return the Explicit Congestion Notification field.
pub fn ecn(&self) -> u8 {
let data = self.buffer.as_ref();
data[field::DSCP_ECN] & 0x03
}
/// Return the total length field.
#[inline]
pub fn total_len(&self) -> u16 {
let data = self.buffer.as_ref();
NetworkEndian::read_u16(&data[field::LENGTH])
}
/// Return the fragment identification field.
#[inline]
pub fn ident(&self) -> u16 {
let data = self.buffer.as_ref();
NetworkEndian::read_u16(&data[field::IDENT])
}
/// Return the "don't fragment" flag.
#[inline]
pub fn dont_frag(&self) -> bool {
let data = self.buffer.as_ref();
NetworkEndian::read_u16(&data[field::FLG_OFF]) & 0x4000 != 0
}
/// Return the "more fragments" flag.
#[inline]
pub fn more_frags(&self) -> bool {
let data = self.buffer.as_ref();
NetworkEndian::read_u16(&data[field::FLG_OFF]) & 0x2000 != 0
}
/// Return the fragment offset, in octets.
#[inline]
pub fn frag_offset(&self) -> u16 {
let data = self.buffer.as_ref();
NetworkEndian::read_u16(&data[field::FLG_OFF]) << 3
}
/// Return the time to live field.
#[inline]
pub fn hop_limit(&self) -> u8 {
let data = self.buffer.as_ref();
data[field::TTL]
}
/// Return the protocol field.
#[inline]
pub fn protocol(&self) -> Protocol {
let data = self.buffer.as_ref();
Protocol::from(data[field::PROTOCOL])
}
/// Return the header checksum field.
#[inline]
pub fn checksum(&self) -> u16 {
let data = self.buffer.as_ref();
NetworkEndian::read_u16(&data[field::CHECKSUM])
}
/// Return the source address field.
#[inline]
pub fn src_addr(&self) -> Address {
let data = self.buffer.as_ref();
Address::from_bytes(&data[field::SRC_ADDR])
}
/// Return the destination address field.
#[inline]
pub fn dst_addr(&self) -> Address {
let data = self.buffer.as_ref();
Address::from_bytes(&data[field::DST_ADDR])
}
/// Validate the header checksum.
///
/// # Fuzzing
/// This function always returns `true` when fuzzing.
pub fn verify_checksum(&self) -> bool {
if cfg!(fuzzing) { return true }
let data = self.buffer.as_ref();
checksum::data(&data[..self.header_len() as usize]) == !0
}
}
impl<'a, T: AsRef<[u8]> + ?Sized> Packet<&'a T> {
/// Return a pointer to the payload.
#[inline]
pub fn payload(&self) -> &'a [u8] {
let range = self.header_len() as usize..self.total_len() as usize;
let data = self.buffer.as_ref();
&data[range]
}
}
impl<T: AsRef<[u8]> + AsMut<[u8]>> Packet<T> {
/// Set the version field.
#[inline]
pub fn set_version(&mut self, value: u8) {
let data = self.buffer.as_mut();
data[field::VER_IHL] = (data[field::VER_IHL] & !0xf0) | (value << 4);
}
/// Set the header length, in octets.
#[inline]
pub fn set_header_len(&mut self, value: u8) {
let data = self.buffer.as_mut();
data[field::VER_IHL] = (data[field::VER_IHL] & !0x0f) | ((value / 4) & 0x0f);
}
/// Set the Differential Services Code Point field.
pub fn set_dscp(&mut self, value: u8) {
let data = self.buffer.as_mut();
data[field::DSCP_ECN] = (data[field::DSCP_ECN] & !0xfc) | (value << 2)
}
/// Set the Explicit Congestion Notification field.
pub fn set_ecn(&mut self, value: u8) {
let data = self.buffer.as_mut();
data[field::DSCP_ECN] = (data[field::DSCP_ECN] & !0x03) | (value & 0x03)
}
/// Set the total length field.
#[inline]
pub fn set_total_len(&mut self, value: u16) {
let data = self.buffer.as_mut();
NetworkEndian::write_u16(&mut data[field::LENGTH], value)
}
/// Set the fragment identification field.
#[inline]
pub fn set_ident(&mut self, value: u16) {
let data = self.buffer.as_mut();
NetworkEndian::write_u16(&mut data[field::IDENT], value)
}
/// Clear the entire flags field.
#[inline]
pub fn clear_flags(&mut self) {
let data = self.buffer.as_mut();
let raw = NetworkEndian::read_u16(&data[field::FLG_OFF]);
let raw = raw & !0xe000;
NetworkEndian::write_u16(&mut data[field::FLG_OFF], raw);
}
/// Set the "don't fragment" flag.
#[inline]
pub fn set_dont_frag(&mut self, value: bool) {
let data = self.buffer.as_mut();
let raw = NetworkEndian::read_u16(&data[field::FLG_OFF]);
let raw = if value { raw | 0x4000 } else { raw & !0x4000 };
NetworkEndian::write_u16(&mut data[field::FLG_OFF], raw);
}
/// Set the "more fragments" flag.
#[inline]
pub fn set_more_frags(&mut self, value: bool) {
let data = self.buffer.as_mut();
let raw = NetworkEndian::read_u16(&data[field::FLG_OFF]);
let raw = if value { raw | 0x2000 } else { raw & !0x2000 };
NetworkEndian::write_u16(&mut data[field::FLG_OFF], raw);
}
/// Set the fragment offset, in octets.
#[inline]
pub fn set_frag_offset(&mut self, value: u16) {
let data = self.buffer.as_mut();
let raw = NetworkEndian::read_u16(&data[field::FLG_OFF]);
let raw = (raw & 0xe000) | (value >> 3);
NetworkEndian::write_u16(&mut data[field::FLG_OFF], raw);
}
/// Set the time to live field.
#[inline]
pub fn set_hop_limit(&mut self, value: u8) {
let data = self.buffer.as_mut();
data[field::TTL] = value
}
/// Set the protocol field.
#[inline]
pub fn set_protocol(&mut self, value: Protocol) {
let data = self.buffer.as_mut();
data[field::PROTOCOL] = value.into()
}
/// Set the header checksum field.
#[inline]
pub fn set_checksum(&mut self, value: u16) {
let data = self.buffer.as_mut();
NetworkEndian::write_u16(&mut data[field::CHECKSUM], value)
}
/// Set the source address field.
#[inline]
pub fn set_src_addr(&mut self, value: Address) {
let data = self.buffer.as_mut();
data[field::SRC_ADDR].copy_from_slice(value.as_bytes())
}
/// Set the destination address field.
#[inline]
pub fn set_dst_addr(&mut self, value: Address) {
let data = self.buffer.as_mut();
data[field::DST_ADDR].copy_from_slice(value.as_bytes())
}
/// Compute and fill in the header checksum.
pub fn fill_checksum(&mut self) {
self.set_checksum(0);
let checksum = {
let data = self.buffer.as_ref();
!checksum::data(&data[..self.header_len() as usize])
};
self.set_checksum(checksum)
}
/// Return a mutable pointer to the payload.
#[inline]
pub fn payload_mut(&mut self) -> &mut [u8] {
let range = self.header_len() as usize..self.total_len() as usize;
let data = self.buffer.as_mut();
&mut data[range]
}
}
impl<T: AsRef<[u8]>> AsRef<[u8]> for Packet<T> {
fn as_ref(&self) -> &[u8] {
self.buffer.as_ref()
}
}
/// A high-level representation of an Internet Protocol version 4 packet header.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub struct Repr {
pub src_addr: Address,
pub dst_addr: Address,
pub protocol: Protocol,
pub payload_len: usize,
pub hop_limit: u8
}
impl Repr {
/// Parse an Internet Protocol version 4 packet and return a high-level representation.
pub fn parse<T: AsRef<[u8]> + ?Sized>(packet: &Packet<&T>,
checksum_caps: &ChecksumCapabilities) -> Result<Repr> {
// Version 4 is expected.
if packet.version() != 4 { return Err(Error::Malformed) }
// Valid checksum is expected.
if checksum_caps.ipv4.rx() && !packet.verify_checksum() { return Err(Error::Checksum) }
// We do not support fragmentation.
if packet.more_frags() || packet.frag_offset() != 0 { return Err(Error::Fragmented) }
// Since the packet is not fragmented, it must include the entire payload.
let payload_len = packet.total_len() as usize - packet.header_len() as usize;
if packet.payload().len() < payload_len { return Err(Error::Truncated) }
// All DSCP values are acceptable, since they are of no concern to receiving endpoint.
// All ECN values are acceptable, since ECN requires opt-in from both endpoints.
// All TTL values are acceptable, since we do not perform routing.
Ok(Repr {
src_addr: packet.src_addr(),
dst_addr: packet.dst_addr(),
protocol: packet.protocol(),
payload_len: payload_len,
hop_limit: packet.hop_limit()
})
}
/// Return the length of a header that will be emitted from this high-level representation.
pub fn buffer_len(&self) -> usize {
// We never emit any options.
field::DST_ADDR.end
}
/// Emit a high-level representation into an Internet Protocol version 4 packet.
pub fn emit<T: AsRef<[u8]> + AsMut<[u8]>>(&self, packet: &mut Packet<T>, checksum_caps: &ChecksumCapabilities) {
packet.set_version(4);
packet.set_header_len(field::DST_ADDR.end as u8);
packet.set_dscp(0);
packet.set_ecn(0);
let total_len = packet.header_len() as u16 + self.payload_len as u16;
packet.set_total_len(total_len);
packet.set_ident(0);
packet.clear_flags();
packet.set_more_frags(false);
packet.set_dont_frag(true);
packet.set_frag_offset(0);
packet.set_hop_limit(self.hop_limit);
packet.set_protocol(self.protocol);
packet.set_src_addr(self.src_addr);
packet.set_dst_addr(self.dst_addr);
if checksum_caps.ipv4.tx() {
packet.fill_checksum();
} else {
// make sure we get a consistently zeroed checksum,
// since implementations might rely on it
packet.set_checksum(0);
}
}
}
impl<'a, T: AsRef<[u8]> + ?Sized> fmt::Display for Packet<&'a T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match Repr::parse(self, &ChecksumCapabilities::ignored()) {
Ok(repr) => write!(f, "{}", repr),
Err(err) => {
write!(f, "IPv4 ({})", err)?;
write!(f, " src={} dst={} proto={} hop_limit={}",
self.src_addr(), self.dst_addr(), self.protocol(), self.hop_limit())?;
if self.version() != 4 {
write!(f, " ver={}", self.version())?;
}
if self.header_len() != 20 {
write!(f, " hlen={}", self.header_len())?;
}
if self.dscp() != 0 {
write!(f, " dscp={}", self.dscp())?;
}
if self.ecn() != 0 {
write!(f, " ecn={}", self.ecn())?;
}
write!(f, " tlen={}", self.total_len())?;
if self.dont_frag() {
write!(f, " df")?;
}
if self.more_frags() {
write!(f, " mf")?;
}
if self.frag_offset() != 0 {
write!(f, " off={}", self.frag_offset())?;
}
if self.more_frags() || self.frag_offset() != 0 {
write!(f, " id={}", self.ident())?;
}
Ok(())
}
}
}
}
impl fmt::Display for Repr {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "IPv4 src={} dst={} proto={}",
self.src_addr, self.dst_addr, self.protocol)
}
}
use crate::wire::pretty_print::{PrettyPrint, PrettyIndent};
impl<T: AsRef<[u8]>> PrettyPrint for Packet<T> {
fn pretty_print(buffer: &dyn AsRef<[u8]>, f: &mut fmt::Formatter,
indent: &mut PrettyIndent) -> fmt::Result {
use crate::wire::ip::checksum::format_checksum;
let checksum_caps = ChecksumCapabilities::ignored();
let (ip_repr, payload) = match Packet::new_checked(buffer) {
Err(err) => return write!(f, "{}({})", indent, err),
Ok(ip_packet) => {
match Repr::parse(&ip_packet, &checksum_caps) {
Err(_) => return Ok(()),
Ok(ip_repr) => {
write!(f, "{}{}", indent, ip_repr)?;
format_checksum(f, ip_packet.verify_checksum())?;
(ip_repr, ip_packet.payload())
}
}
}
};
pretty_print_ip_payload(f, indent, ip_repr, payload)
}
}
#[cfg(test)]
mod test {
use super::*;
static PACKET_BYTES: [u8; 30] =
[0x45, 0x00, 0x00, 0x1e,
0x01, 0x02, 0x62, 0x03,
0x1a, 0x01, 0xd5, 0x6e,
0x11, 0x12, 0x13, 0x14,
0x21, 0x22, 0x23, 0x24,
0xaa, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0xff];
static PAYLOAD_BYTES: [u8; 10] =
[0xaa, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0xff];
#[test]
fn test_deconstruct() {
let packet = Packet::new_unchecked(&PACKET_BYTES[..]);
assert_eq!(packet.version(), 4);
assert_eq!(packet.header_len(), 20);
assert_eq!(packet.dscp(), 0);
assert_eq!(packet.ecn(), 0);
assert_eq!(packet.total_len(), 30);
assert_eq!(packet.ident(), 0x102);
assert_eq!(packet.more_frags(), true);
assert_eq!(packet.dont_frag(), true);
assert_eq!(packet.frag_offset(), 0x203 * 8);
assert_eq!(packet.hop_limit(), 0x1a);
assert_eq!(packet.protocol(), Protocol::Icmp);
assert_eq!(packet.checksum(), 0xd56e);
assert_eq!(packet.src_addr(), Address([0x11, 0x12, 0x13, 0x14]));
assert_eq!(packet.dst_addr(), Address([0x21, 0x22, 0x23, 0x24]));
assert_eq!(packet.verify_checksum(), true);
assert_eq!(packet.payload(), &PAYLOAD_BYTES[..]);
}
#[test]
fn test_construct() {
let mut bytes = vec![0xa5; 30];
let mut packet = Packet::new_unchecked(&mut bytes);
packet.set_version(4);
packet.set_header_len(20);
packet.clear_flags();
packet.set_dscp(0);
packet.set_ecn(0);
packet.set_total_len(30);
packet.set_ident(0x102);
packet.set_more_frags(true);
packet.set_dont_frag(true);
packet.set_frag_offset(0x203 * 8);
packet.set_hop_limit(0x1a);
packet.set_protocol(Protocol::Icmp);
packet.set_src_addr(Address([0x11, 0x12, 0x13, 0x14]));
packet.set_dst_addr(Address([0x21, 0x22, 0x23, 0x24]));
packet.fill_checksum();
packet.payload_mut().copy_from_slice(&PAYLOAD_BYTES[..]);
assert_eq!(&packet.into_inner()[..], &PACKET_BYTES[..]);
}
#[test]
fn test_overlong() {
let mut bytes = vec![];
bytes.extend(&PACKET_BYTES[..]);
bytes.push(0);
assert_eq!(Packet::new_unchecked(&bytes).payload().len(),
PAYLOAD_BYTES.len());
assert_eq!(Packet::new_unchecked(&mut bytes).payload_mut().len(),
PAYLOAD_BYTES.len());
}
#[test]
fn test_total_len_overflow() {
let mut bytes = vec![];
bytes.extend(&PACKET_BYTES[..]);
Packet::new_unchecked(&mut bytes).set_total_len(128);
assert_eq!(Packet::new_checked(&bytes).unwrap_err(),
Error::Truncated);
}
static REPR_PACKET_BYTES: [u8; 24] =
[0x45, 0x00, 0x00, 0x18,
0x00, 0x00, 0x40, 0x00,
0x40, 0x01, 0xd2, 0x79,
0x11, 0x12, 0x13, 0x14,
0x21, 0x22, 0x23, 0x24,
0xaa, 0x00, 0x00, 0xff];
static REPR_PAYLOAD_BYTES: [u8; 4] =
[0xaa, 0x00, 0x00, 0xff];
fn packet_repr() -> Repr {
Repr {
src_addr: Address([0x11, 0x12, 0x13, 0x14]),
dst_addr: Address([0x21, 0x22, 0x23, 0x24]),
protocol: Protocol::Icmp,
payload_len: 4,
hop_limit: 64
}
}
#[test]
fn test_parse() {
let packet = Packet::new_unchecked(&REPR_PACKET_BYTES[..]);
let repr = Repr::parse(&packet, &ChecksumCapabilities::default()).unwrap();
assert_eq!(repr, packet_repr());
}
#[test]
fn test_parse_bad_version() {
let mut bytes = vec![0; 24];
bytes.copy_from_slice(&REPR_PACKET_BYTES[..]);
let mut packet = Packet::new_unchecked(&mut bytes);
packet.set_version(6);
packet.fill_checksum();
let packet = Packet::new_unchecked(&*packet.into_inner());
assert_eq!(Repr::parse(&packet, &ChecksumCapabilities::default()), Err(Error::Malformed));
}
#[test]
fn test_parse_total_len_less_than_header_len() {
let mut bytes = vec![0; 40];
bytes[0] = 0x09;
assert_eq!(Packet::new_checked(&mut bytes), Err(Error::Malformed));
}
#[test]
fn test_emit() {
let repr = packet_repr();
let mut bytes = vec![0xa5; repr.buffer_len() + REPR_PAYLOAD_BYTES.len()];
let mut packet = Packet::new_unchecked(&mut bytes);
repr.emit(&mut packet, &ChecksumCapabilities::default());
packet.payload_mut().copy_from_slice(&REPR_PAYLOAD_BYTES);
assert_eq!(&packet.into_inner()[..], &REPR_PACKET_BYTES[..]);
}
#[test]
fn test_unspecified() {
assert!(Address::UNSPECIFIED.is_unspecified());
assert!(!Address::UNSPECIFIED.is_broadcast());
assert!(!Address::UNSPECIFIED.is_multicast());
assert!(!Address::UNSPECIFIED.is_link_local());
assert!(!Address::UNSPECIFIED.is_loopback());
}
#[test]
fn test_broadcast() {
assert!(!Address::BROADCAST.is_unspecified());
assert!(Address::BROADCAST.is_broadcast());
assert!(!Address::BROADCAST.is_multicast());
assert!(!Address::BROADCAST.is_link_local());
assert!(!Address::BROADCAST.is_loopback());
}
#[test]
fn test_cidr() {
let cidr = Cidr::new(Address::new(192, 168, 1, 10), 24);
let inside_subnet = [
[192, 168, 1, 0], [192, 168, 1, 1],
[192, 168, 1, 2], [192, 168, 1, 10],
[192, 168, 1, 127], [192, 168, 1, 255],
];
let outside_subnet = [
[192, 168, 0, 0], [127, 0, 0, 1],
[192, 168, 2, 0], [192, 168, 0, 255],
[ 0, 0, 0, 0], [255, 255, 255, 255],
];
let subnets = [
([192, 168, 1, 0], 32),
([192, 168, 1, 255], 24),
([192, 168, 1, 10], 30),
];
let not_subnets = [
([192, 168, 1, 10], 23),
([127, 0, 0, 1], 8),
([192, 168, 1, 0], 0),
([192, 168, 0, 255], 32),
];
for addr in inside_subnet.iter().map(|a| Address::from_bytes(a)) {
assert!(cidr.contains_addr(&addr));
}
for addr in outside_subnet.iter().map(|a| Address::from_bytes(a)) {
assert!(!cidr.contains_addr(&addr));
}
for subnet in subnets.iter().map(
|&(a, p)| Cidr::new(Address::new(a[0], a[1], a[2], a[3]), p)) {
assert!(cidr.contains_subnet(&subnet));
}
for subnet in not_subnets.iter().map(
|&(a, p)| Cidr::new(Address::new(a[0], a[1], a[2], a[3]), p)) {
assert!(!cidr.contains_subnet(&subnet));
}
let cidr_without_prefix = Cidr::new(cidr.address(), 0);
assert!(cidr_without_prefix.contains_addr(&Address::new(127, 0, 0, 1)));
}
#[test]
fn test_cidr_from_netmask() {
assert_eq!(Cidr::from_netmask(Address([0, 0, 0, 0]), Address([1, 0, 2, 0])).is_err(),
true);
assert_eq!(Cidr::from_netmask(Address([0, 0, 0, 0]), Address([0, 0, 0, 0])).is_err(),
true);
assert_eq!(Cidr::from_netmask(Address([0, 0, 0, 1]), Address([255, 255, 255, 0])).unwrap(),
Cidr::new(Address([0, 0, 0, 1]), 24));
assert_eq!(Cidr::from_netmask(Address([192, 168, 0, 1]), Address([255, 255, 0, 0])).unwrap(),
Cidr::new(Address([192, 168, 0, 1]), 16));
assert_eq!(Cidr::from_netmask(Address([172, 16, 0, 1]), Address([255, 240, 0, 0])).unwrap(),
Cidr::new(Address([172, 16, 0, 1]), 12));
assert_eq!(Cidr::from_netmask(Address([255, 255, 255, 1]), Address([255, 255, 255, 0])).unwrap(),
Cidr::new(Address([255, 255, 255, 1]), 24));
assert_eq!(Cidr::from_netmask(Address([255, 255, 255, 255]), Address([255, 255, 255, 255])).unwrap(),
Cidr::new(Address([255, 255, 255, 255]), 32));
}
#[test]
fn test_cidr_netmask() {
assert_eq!(Cidr::new(Address([0, 0, 0, 0]), 0).netmask(),
Address([0, 0, 0, 0]));
assert_eq!(Cidr::new(Address([0, 0, 0, 1]), 24).netmask(),
Address([255, 255, 255, 0]));
assert_eq!(Cidr::new(Address([0, 0, 0, 0]), 32).netmask(),
Address([255, 255, 255, 255]));
assert_eq!(Cidr::new(Address([127, 0, 0, 0]), 8).netmask(),
Address([255, 0, 0, 0]));
assert_eq!(Cidr::new(Address([192, 168, 0, 0]), 16).netmask(),
Address([255, 255, 0, 0]));
assert_eq!(Cidr::new(Address([192, 168, 1, 1]), 16).netmask(),
Address([255, 255, 0, 0]));
assert_eq!(Cidr::new(Address([192, 168, 1, 1]), 17).netmask(),
Address([255, 255, 128, 0]));
assert_eq!(Cidr::new(Address([172, 16, 0, 0]), 12).netmask(),
Address([255, 240, 0, 0]));
assert_eq!(Cidr::new(Address([255, 255, 255, 1]), 24).netmask(),
Address([255, 255, 255, 0]));
assert_eq!(Cidr::new(Address([255, 255, 255, 255]), 32).netmask(),
Address([255, 255, 255, 255]));
}
#[test]
fn test_cidr_broadcast() {
assert_eq!(Cidr::new(Address([0, 0, 0, 0]), 0).broadcast().unwrap(),
Address([255, 255, 255, 255]));
assert_eq!(Cidr::new(Address([0, 0, 0, 1]), 24).broadcast().unwrap(),
Address([0, 0, 0, 255]));
assert_eq!(Cidr::new(Address([0, 0, 0, 0]), 32).broadcast(),
None);
assert_eq!(Cidr::new(Address([127, 0, 0, 0]), 8).broadcast().unwrap(),
Address([127, 255, 255, 255]));
assert_eq!(Cidr::new(Address([192, 168, 0, 0]), 16).broadcast().unwrap(),
Address([192, 168, 255, 255]));
assert_eq!(Cidr::new(Address([192, 168, 1, 1]), 16).broadcast().unwrap(),
Address([192, 168, 255, 255]));
assert_eq!(Cidr::new(Address([192, 168, 1, 1]), 17).broadcast().unwrap(),
Address([192, 168, 127, 255]));
assert_eq!(Cidr::new(Address([172, 16, 0, 1]), 12).broadcast().unwrap(),
Address([172, 31, 255, 255]));
assert_eq!(Cidr::new(Address([255, 255, 255, 1]), 24).broadcast().unwrap(),
Address([255, 255, 255, 255]));
assert_eq!(Cidr::new(Address([255, 255, 255, 254]), 31).broadcast(),
None);
assert_eq!(Cidr::new(Address([255, 255, 255, 255]), 32).broadcast(),
None);
}
#[test]
fn test_cidr_network() {
assert_eq!(Cidr::new(Address([0, 0, 0, 0]), 0).network(),
Cidr::new(Address([0, 0, 0, 0]), 0));
assert_eq!(Cidr::new(Address([0, 0, 0, 1]), 24).network(),
Cidr::new(Address([0, 0, 0, 0]), 24));
assert_eq!(Cidr::new(Address([0, 0, 0, 0]), 32).network(),
Cidr::new(Address([0, 0, 0, 0]), 32));
assert_eq!(Cidr::new(Address([127, 0, 0, 0]), 8).network(),
Cidr::new(Address([127, 0, 0, 0]), 8));
assert_eq!(Cidr::new(Address([192, 168, 0, 0]), 16).network(),
Cidr::new(Address([192, 168, 0, 0]), 16));
assert_eq!(Cidr::new(Address([192, 168, 1, 1]), 16).network(),
Cidr::new(Address([192, 168, 0, 0]), 16));
assert_eq!(Cidr::new(Address([192, 168, 1, 1]), 17).network(),
Cidr::new(Address([192, 168, 0, 0]), 17));
assert_eq!(Cidr::new(Address([172, 16, 0, 1]), 12).network(),
Cidr::new(Address([172, 16, 0, 0]), 12));
assert_eq!(Cidr::new(Address([255, 255, 255, 1]), 24).network(),
Cidr::new(Address([255, 255, 255, 0]), 24));
assert_eq!(Cidr::new(Address([255, 255, 255, 255]), 32).network(),
Cidr::new(Address([255, 255, 255, 255]), 32));
}
}
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