author | Sunil Nimmagadda <sunil@nimmagadda.net> |
Thu, 28 Dec 2023 23:17:24 +0530 | |
changeset 16 | 8c8be538d0e6 |
parent 13 | 61c484b134c8 |
child 17 | 90d097c9ea62 |
permissions | -rw-r--r-- |
16 | 1 |
//! Parser recognising a VRRP v2 packet. |
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use nom::error::Error; |
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use nom::multi::count; |
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use nom::number::complete::{be_u16, be_u32, u8}; |
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use nom::{bits::complete::take, IResult}; |
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use std::net::Ipv4Addr; |
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type BitInput<'a> = (&'a [u8], usize); |
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||
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/// A VRRP version 2 packet. |
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/// |
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/// Packet format |
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/// |
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/// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// |Version| Type | Virtual Rtr ID| Priority | Count IP Addrs| |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// | Auth Type | Adver Int | Checksum | |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// | IP Address (1) | |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// | . | |
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/// | . | |
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/// | . | |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// | IP Address (n) | |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// | Authentication Data (1) | |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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/// | Authentication Data (2) | |
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/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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#[derive(Debug, PartialEq)] |
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pub struct VRRPv2 { |
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pub virtual_router_id: u8, |
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pub priority: u8, |
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pub count_ip_addrs: u8, |
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pub auth_type: VRRPv2AuthType, |
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pub advertisement_interval: u8, |
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pub checksum: u16, |
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pub ip_addrs: Vec<Ipv4Addr>, |
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} |
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Module to parse(unimplemented) VRRPv2 packet.
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parents:
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#[derive(Debug, Clone, PartialEq)] |
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pub enum VRRPv2Error { |
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InvalidAuthType, |
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InvalidChecksum, |
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InvalidType, |
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InvalidVersion, |
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ParseError, |
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} |
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Module to parse(unimplemented) VRRPv2 packet.
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parents:
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#[derive(Debug, PartialEq)] |
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pub enum VRRPv2AuthType { |
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VRRPv2AuthNoAuth = 0x00, |
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VRRPv2AuthReserved1 = 0x01, |
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VRRPv2AuthReserved2 = 0x02, |
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} |
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/// Helper function to let compiler infer generic parameters. |
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fn take_nibble(input: BitInput) -> IResult<BitInput, u8> { |
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take(4usize)(input) |
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} |
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fn parse(input: &[u8]) -> Result<VRRPv2, VRRPv2Error> { |
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let Ok(((input, _), version)) = take_nibble((input, 0)) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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if version != 2 { |
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return Err(VRRPv2Error::InvalidVersion); |
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} |
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let Ok(((input, _), type_)) = take_nibble((input, 4)) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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//Advertisement |
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if type_ != 1 { |
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return Err(VRRPv2Error::InvalidType); |
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} |
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let Ok((input, virtual_router_id)) = u8::<&[u8], Error<&[u8]>>(input) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let Ok((input, priority)) = u8::<&[u8], Error<&[u8]>>(input) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let Ok((input, count_ip_addrs)) = u8::<&[u8], Error<&[u8]>>(input) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let Ok((input, auth_type)) = u8::<&[u8], Error<&[u8]>>(input) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let auth_type = match auth_type { |
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0 => VRRPv2AuthType::VRRPv2AuthNoAuth, |
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1 => VRRPv2AuthType::VRRPv2AuthReserved1, |
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2 => VRRPv2AuthType::VRRPv2AuthReserved2, |
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_ => return Err(VRRPv2Error::InvalidAuthType), |
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}; |
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let Ok((input, advertisement_interval)) = u8::<&[u8], Error<&[u8]>>(input) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let Ok((input, checksum)) = be_u16::<&[u8], Error<&[u8]>>(input) else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let Ok((_, xs)) = count(be_u32::<&[u8], Error<&[u8]>>, usize::from(count_ip_addrs))(input) |
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else { |
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return Err(VRRPv2Error::ParseError); |
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}; |
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let ip_addrs: Vec<Ipv4Addr> = xs.into_iter().map(Ipv4Addr::from).collect(); |
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Ok(VRRPv2 { |
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virtual_router_id, |
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priority, |
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count_ip_addrs, |
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auth_type, |
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advertisement_interval, |
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checksum, |
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ip_addrs, |
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}) |
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parents:
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} |
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parents:
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// Nightly has a nicer array_chunks API to express it more succinctly. |
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// let mut chunks = bytes.array_chunks(2); |
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// let mut sum = chunks.map(u16::from_ne_bytes).map(|b| b as u32).sum::<u32>(); |
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// // handle the remainder |
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// if let Some([b]) = chunks.remainder() { |
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// sum += *b as u32 |
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// } |
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// Shadowing can be used to avoid `mut`... |
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// let sum =...; |
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// let sum = (sum & 0xffff) + (sum >> 16); |
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// let sum = (sum & 0xffff) + (sum >> 16); |
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// manually un-rolling while loop since it's needed atmost twice for an u32. |
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fn validate_checksum(bytes: &[u8]) -> bool { |
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let mut sum: u32 = bytes.chunks(2).fold(0, |acc: u32, x| { |
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acc + u32::from(u16::from_ne_bytes(x.try_into().unwrap())) |
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}); |
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while (sum >> 16) > 0 { |
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sum = (sum & 0xffff) + (sum >> 16); |
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} |
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let checksum = !(sum as u16); |
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checksum == 0 |
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} |
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/// Parse and validate a byte array to construct a VRRPv2 struct. |
143 |
/// |
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144 |
/// # Examples |
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145 |
/// |
|
146 |
/// ``` |
|
147 |
/// use vrrpd::vrrpv2::VRRPv2; |
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148 |
/// use vrrpd::vrrpv2::VRRPv2AuthType; |
|
149 |
/// use vrrpd::vrrpv2::from_bytes; |
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150 |
/// use std::net::Ipv4Addr; |
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151 |
/// |
|
152 |
/// let bytes = [ |
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/// 0x21, 0x01, 0x64, 0x01, 0x00, 0x01, 0xba, 0x52, 0xc0, 0xa8, 0x00, 0x01, 0x00, 0x00, 0x00, |
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/// 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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/// ]; |
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156 |
/// let expected = VRRPv2 { |
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157 |
/// virtual_router_id: 1, |
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/// priority: 100, |
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/// count_ip_addrs: 1, |
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160 |
/// auth_type: VRRPv2AuthType::VRRPv2AuthNoAuth, |
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/// checksum: 47698, |
|
162 |
/// advertisement_interval: 1, |
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163 |
/// ip_addrs: vec![Ipv4Addr::from([192, 168, 0, 1])], |
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164 |
/// }; |
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165 |
/// assert_eq!(from_bytes(&bytes), Ok(expected)); |
|
166 |
/// ``` |
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parents:
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pub fn from_bytes(bytes: &[u8]) -> Result<VRRPv2, VRRPv2Error> { |
16 | 168 |
let vrrpv2 = parse(bytes)?; |
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if !validate_checksum(bytes) { |
16 | 170 |
return Err(VRRPv2Error::InvalidChecksum); |
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} |
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Ok(vrrpv2) |
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} |
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#[test] |
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fn test_incomplete_bytes() { |
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let bytes = [0x21, 0x01]; |
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assert_eq!(from_bytes(&bytes), Err(VRRPv2Error::ParseError)); |
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} |
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#[test] |
16 | 182 |
fn test_invalid_version() { |
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let bytes = [ |
16 | 184 |
0x31, 0x2a, 0x64, 0x1, 0x0, 0x1, 0xaa, 0x29, 0xc0, 0xa8, 0x0, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, |
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0x0, 0x0, 0x0, |
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]; |
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187 |
let got = from_bytes(&bytes); |
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assert_eq!(got.is_err(), true); |
16 | 189 |
assert_eq!(got.err(), Some(VRRPv2Error::InvalidVersion)); |
190 |
} |
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191 |
||
192 |
#[test] |
|
193 |
fn test_invalid_type() { |
|
194 |
let bytes = [ |
|
195 |
0x20, 0x1, 0x2a, 0x0, 0x0, 0x1, 0xb5, 0xfd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, |
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0x0, 0x0, 0x0, |
|
197 |
]; |
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198 |
let got = from_bytes(&bytes); |
|
199 |
assert_eq!(got.is_err(), true); |
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assert_eq!(got.err(), Some(VRRPv2Error::InvalidType)); |
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} |
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#[test] |
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fn test_invalid_auth_type() { |
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let bytes = [ |
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0x21, 0x01, 0x64, 0x01, 0x03, 0x01, 0xba, 0x52, 0xc0, 0xa8, 0x00, 0x01, 0x00, 0x00, 0x00, |
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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Implement a VRRPv2 packet parser.
Sunil Nimmagadda <sunil@nimmagadda.net>
parents:
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208 |
]; |
16 | 209 |
assert_eq!(from_bytes(&bytes), Err(VRRPv2Error::InvalidAuthType)); |
8
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Sunil Nimmagadda <sunil@nimmagadda.net>
parents:
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210 |
} |
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Implement a VRRPv2 packet parser.
Sunil Nimmagadda <sunil@nimmagadda.net>
parents:
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211 |
|
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Implement a VRRPv2 packet parser.
Sunil Nimmagadda <sunil@nimmagadda.net>
parents:
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diff
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212 |
#[test] |
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Implement a VRRPv2 packet parser.
Sunil Nimmagadda <sunil@nimmagadda.net>
parents:
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fn test_invalid_checksum() { |
10 | 214 |
let bytes = [ |
215 |
0x21, 0x01, 0x64, 0x01, 0x00, 0x01, 0xbb, 0x52, 0xc0, 0xa8, 0x00, 0x01, 0x00, 0x00, 0x00, |
|
216 |
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
|
217 |
]; |
|
16 | 218 |
assert_eq!(from_bytes(&bytes), Err(VRRPv2Error::InvalidChecksum)); |
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Implement a VRRPv2 packet parser.
Sunil Nimmagadda <sunil@nimmagadda.net>
parents:
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219 |
} |