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use byteorder::{BigEndian, ReadBytesExt}; use ip_network::{IpNetwork, Ipv4Network, Ipv6Network}; use std::io; use std::net::{IpAddr, Ipv4Addr, Ipv6Addr}; use std::str; pub mod bgp; pub mod processor; pub trait Message<M> { fn parse<R: ReadBytesExt>(reader: &mut R, header: &MrtHeader) -> io::Result<M>; fn can_parse(typ: MrtType) -> bool; } #[derive(Debug, Copy, Clone, PartialEq)] pub enum TableDump { AfiIpv4, AfiIpv6, Unknown(u16), } #[derive(Debug, Copy, Clone, PartialEq)] pub enum TableDumpV2 { PeerIndex, RibIpv4Unicast, RibIpv6Unicast, Unknown(u16), } #[derive(Debug, Copy, Clone, PartialEq)] pub enum MrtType { TableDump(TableDump), TableDumpV2(TableDumpV2), Unknown(u16), } #[derive(Debug)] pub struct MrtHeader { pub timestamp: u32, pub typ: MrtType, pub length: u32, } pub struct Parser<R: ReadBytesExt> { reader: R, } impl<R: ReadBytesExt> Parser<R> { pub fn new(reader: R) -> Self { Self { reader } } pub fn read_header(&mut self) -> io::Result<Option<MrtHeader>> { let timestamp = match self.reader.read_u32::<BigEndian>() { Ok(timestamp) => timestamp, Err(e) => { return if e.kind() == io::ErrorKind::UnexpectedEof { Ok(None) } else { Err(e) } } }; let typ = self.reader.read_u16::<BigEndian>()?; let subtype = self.reader.read_u16::<BigEndian>()?; let length = self.reader.read_u32::<BigEndian>()?; let typ = match typ { 12 => MrtType::TableDump(match subtype { 1 => TableDump::AfiIpv4, 2 => TableDump::AfiIpv6, _ => TableDump::Unknown(subtype), }), 13 => MrtType::TableDumpV2(match subtype { 1 => TableDumpV2::PeerIndex, 2 => TableDumpV2::RibIpv4Unicast, 4 => TableDumpV2::RibIpv6Unicast, _ => TableDumpV2::Unknown(subtype), }), _ => MrtType::Unknown(typ), }; Ok(Some(MrtHeader { timestamp, typ, length, })) } pub fn skip_message(&mut self, header: &MrtHeader) -> io::Result<()> { read_exact(&mut self.reader, header.length as usize)?; Ok(()) } pub fn read_message<M: Message<M>>(&mut self, header: &MrtHeader) -> io::Result<M> { if !M::can_parse(header.typ) { panic!("This parser cannot parse {:?}", header.typ); } M::parse(&mut self.reader, header) } } #[derive(Debug)] pub struct Afi { pub view_number: u16, pub sequence_number: u16, pub prefix: IpNetwork, pub status: u8, pub originated_time: u32, pub peer_ip: IpAddr, pub peer_as: u16, data: Vec<u8>, } impl Message<Afi> for Afi { fn parse<R: ReadBytesExt>(reader: &mut R, header: &MrtHeader) -> io::Result<Self> { let is_ipv6 = match header.typ { MrtType::TableDump(subtype) => match subtype { TableDump::AfiIpv4 => false, TableDump::AfiIpv6 => true, _ => panic!("Only AFI_IPv4 and AFI_IPv6 subtypes are supported"), }, _ => panic!("Only TableDump types is supported"), }; let view_number = reader.read_u16::<BigEndian>()?; let sequence_number = reader.read_u16::<BigEndian>()?; let prefix_ip = read_ip_addr(reader, is_ipv6)?; let prefix_length = reader.read_u8()?; let prefix = IpNetwork::new(prefix_ip, prefix_length).unwrap(); let status = reader.read_u8()?; let originated_time = reader.read_u32::<BigEndian>()?; let peer_ip = read_ip_addr(reader, is_ipv6)?; let peer_as = reader.read_u16::<BigEndian>()?; let attribute_length = reader.read_u16::<BigEndian>()?; let data = read_exact(reader, attribute_length as usize)?; Ok(Afi { view_number, sequence_number, prefix, status, originated_time, peer_ip, peer_as, data, }) } fn can_parse(typ: MrtType) -> bool { typ == MrtType::TableDump(TableDump::AfiIpv4) || typ == MrtType::TableDump(TableDump::AfiIpv6) } } impl Afi { pub fn get_bgp_attributes(&self) -> io::Result<Vec<bgp::Attribute>> { bgp::Attribute::parse_all(&self.data) } } #[derive(Debug)] pub struct PeerIndexTable { pub collector_bgp_id: u32, pub view_name: String, pub peer_entries: Vec<PeerEntry>, } impl Message<PeerIndexTable> for PeerIndexTable { fn parse<R: ReadBytesExt>(reader: &mut R, _: &MrtHeader) -> io::Result<Self> { let collector_bgp_id = reader.read_u32::<BigEndian>()?; let view_name_length = reader.read_u16::<BigEndian>()?; let view_name_buffer = read_exact(reader, view_name_length as usize)?; let view_name = str::from_utf8(&view_name_buffer) .map(|x| x.to_string()) .map_err(|_| { io::Error::new( io::ErrorKind::InvalidData, "PeerIndexTable view name did not contain valid UTF-8", ) })?; let peer_count = reader.read_u16::<BigEndian>()?; let mut peer_entries = Vec::with_capacity(peer_count as usize); for _ in 0..peer_count { peer_entries.push(PeerEntry::parse(reader)?); } Ok(PeerIndexTable { collector_bgp_id, view_name, peer_entries, }) } fn can_parse(typ: MrtType) -> bool { typ == MrtType::TableDumpV2(TableDumpV2::PeerIndex) } } #[derive(Debug)] pub struct PeerEntry { pub peer_bgp_id: u32, pub ip_addr: IpAddr, pub asn: u32, } impl PeerEntry { fn parse<R: ReadBytesExt>(rdr: &mut R) -> io::Result<Self> { let type_ = rdr.read_u8()?; let is_ipv6 = ((type_) & 0x1) == 1; let is_asn_32bit = ((type_ >> 1) & 0x1) == 1; let peer_bgp_id = rdr.read_u32::<BigEndian>()?; let ip_addr = read_ip_addr(rdr, is_ipv6)?; let asn = if is_asn_32bit { rdr.read_u32::<BigEndian>()? } else { rdr.read_u16::<BigEndian>()? as u32 }; Ok(Self { peer_bgp_id, ip_addr, asn, }) } } #[derive(Debug)] pub struct RibEntry { pub sequence_number: u32, pub prefix: IpNetwork, pub sub_entries: Vec<RibSubEntry>, } impl Message<RibEntry> for RibEntry { fn parse<R: ReadBytesExt>(reader: &mut R, header: &MrtHeader) -> io::Result<Self> { let sequence_number = reader.read_u32::<BigEndian>()?; let prefix_length = reader.read_u8()?; let prefix_bytes = ((prefix_length + 7) / 8) as usize; let prefix_buffer = read_exact(reader, prefix_bytes)?; let prefix = match header.typ { MrtType::TableDumpV2(subtype) => match subtype { TableDumpV2::RibIpv4Unicast => { debug_assert!(prefix_length <= 32); let mut parts: [u8; 4] = [0; 4]; parts[..prefix_bytes].copy_from_slice(prefix_buffer.as_slice()); let ip = Ipv4Addr::from(parts); IpNetwork::V4(Ipv4Network::new(ip, prefix_length).unwrap()) } TableDumpV2::RibIpv6Unicast => { debug_assert!(prefix_length <= 128); let mut parts: [u8; 16] = [0; 16]; parts[..prefix_bytes].copy_from_slice(prefix_buffer.as_slice()); let ip = Ipv6Addr::from(parts); IpNetwork::V6(Ipv6Network::new(ip, prefix_length).unwrap()) } _ => panic!("This parser cannot parse TableDumpV2 {:?} subtype", subtype), }, _ => panic!("This parser cannot parse {:?} type", header.typ), }; let entry_count = reader.read_u16::<BigEndian>()?; let mut sub_entries = Vec::with_capacity(entry_count as usize); for _ in 0..entry_count { sub_entries.push(RibSubEntry::parse(reader)?); } Ok(RibEntry { sequence_number, prefix, sub_entries, }) } fn can_parse(typ: MrtType) -> bool { typ == MrtType::TableDumpV2(TableDumpV2::RibIpv4Unicast) || typ == MrtType::TableDumpV2(TableDumpV2::RibIpv6Unicast) } } #[derive(Debug)] pub struct RibSubEntry { pub peer_index: u16, pub originated_time: u32, data: Vec<u8>, } impl RibSubEntry { fn parse<R: ReadBytesExt>(rdr: &mut R) -> io::Result<RibSubEntry> { let peer_index = rdr.read_u16::<BigEndian>()?; let originated_time = rdr.read_u32::<BigEndian>()?; let attribute_length = rdr.read_u16::<BigEndian>()?; let data = read_exact(rdr, attribute_length as usize)?; Ok(RibSubEntry { peer_index, originated_time, data, }) } pub fn get_bgp_attributes(&self) -> io::Result<Vec<bgp::Attribute>> { bgp::Attribute::parse_all(&self.data) } } fn read_ip_addr<R: ReadBytesExt>(rdr: &mut R, is_ipv6: bool) -> io::Result<IpAddr> { if is_ipv6 { let mut buffer = [0; 16]; rdr.read_exact(&mut buffer)?; Ok(IpAddr::V6(Ipv6Addr::from(buffer))) } else { Ok(IpAddr::V4(Ipv4Addr::from(rdr.read_u32::<BigEndian>()?))) } } #[inline] fn read_exact<R: ReadBytesExt>(rdr: &mut R, length: usize) -> io::Result<Vec<u8>> { let mut buffer = vec![0; length as usize]; rdr.read_exact(buffer.as_mut_slice())?; Ok(buffer) }