Crate bgpkit_parser[−][src]

Expand description

BGPKIT Parser aims to provides the most ergonomic MRT/BGP message parsing Rust API.

Features:

performant: comparable to C-based implementations like bgpdump or bgpreader.
actively maintained: we consistently introduce feature updates and bug fixes, and support most of the relevant BGP RFCs.
ergonomic API: a three-line for loop can already get you started.
battery-included: ready to handle remote or local, bzip2 or gz data files out of the box

Examples

Parsing single MRT file

Let’s say we want to print out all the BGP announcements/withdrawal from a single MRT file, either located remotely or locally. Here is an example that does so.

use bgpkit_parser::BgpkitParser;
fn main() {
    let parser = BgpkitParser::new("http://archive.routeviews.org/bgpdata/2021.10/UPDATES/updates.20211001.0000.bz2");
    for elem in parser {
        println!("{}", elem)
    }
}

Yes, it is this simple!

You can even do some more interesting iterator operations that are event shorter. For example, counting the number of announcements/withdrawals in that file:

use bgpkit_parser::BgpkitParser;
fn main() {
    let url = "http://archive.routeviews.org/bgpdata/2021.10/UPDATES/updates.20211001.0000.bz2";
    let count = BgpkitParser::new(url).into_iter().count();
    println!("total: {}", count);
}

and it prints out

total: 255849

Parsing multiple MRT files with BGPKIT Broker

BGPKIT Broker library provides search API for all RouteViews and RIPE RIS MRT data files. Using the broker’s Rust API (bgpkit-broker), we can easily compile a list of MRT files that we are interested in for any time period and any data type (update or rib). This allows users to gather information without needing to know about locations of specific data files.

The example below shows a relatively more interesting example that does the following:

find all BGP archive data created on time 1634693400
filter to only BGP updates files
find all announcements originated from AS13335
print out the total count of the announcements

use bgpkit_parser::{BgpkitParser, BgpElem};
fn main(){
    // set broker query parameters
    let mut params = bgpkit_broker::QueryParams::new();
    params = params.start_ts(1634693400);
    params = params.end_ts(1634693400);
    params = params.data_type("update");
    let mut broker = bgpkit_broker::BgpkitBroker::new("https://api.broker.bgpkit.com/v1");
    broker.set_params(&params);

    // loop through data files found by broker
    for item in broker {

        // create a parser that takes an URL and automatically determine
        // the file location and file type, and handles data download and
        // decompression streaming intelligently
        let parser = BgpkitParser::new(item.url.as_str());

        // iterating through the parser. the iterator returns `BgpElem` one at a time.
        let elems = parser.into_elem_iter().map(|elem|{
            if let Some(origins) = &elem.origin_asns {
                if origins.contains(&13335) {
                    Some(elem)
                } else {
                    None
                }
            } else {
                None
            }
        }).filter_map(|x|x).collect::<Vec<BgpElem>>();
        log::info!("{} elems matches", elems.len());
    }
}

Data Representation

There are two key data structure to understand for the parsing results: MrtRecord and BgpElem.

`MrtRecord`: unmodified MRT information representation

The MrtRecord is the data structrue that holds the unmodified, complete information parsed from the MRT data file. The code definition of the MrtRecord is defined in the crate bgp-models (documentation).

pub struct MrtRecord {
    pub common_header: CommonHeader,
    pub message: MrtMessage,
}

pub enum MrtMessage {
    TableDumpMessage(TableDumpMessage),
    TableDumpV2Message(TableDumpV2Message),
    Bgp4Mp(Bgp4Mp),
}

MrtRecord record representation is concise, storage efficient, but often less convenient to use. For example, when trying to find out specific BGP announcements for certain IP prefix, we often needs to go through nested layers of internal data structure (NLRI, announced, prefix, or even looking up peer index table for Table Dump V2 format), which could be irrelevant to what users really want to do.

BgpElem: per-prefix BGP information, MRT-format-agnostic

To facilitate simpler data analysis of BGP data, we defined a new data structure called BgpElem in this crate. Each BgpElem contains a piece of self-containing BGP information about one single IP prefix. For example, when a bundled announcement of three prefixes P1, P2, P3 that shares the same AS path is processed, we break the single record into three different BgpElem objects, each presenting a prefix.

pub struct BgpElem {
    pub timestamp: f64,
    pub elem_type: ElemType,
    pub peer_ip: IpAddr,
    pub peer_asn: Asn,
    pub prefix: NetworkPrefix,
    pub next_hop: Option<IpAddr>,
    pub as_path: Option<AsPath>,
    pub origin_asns: Option<Vec<Asn>>,
    pub origin: Option<Origin>,
    pub local_pref: Option<u32>,
    pub med: Option<u32>,
    pub communities: Option<Vec<Community>>,
    pub atomic: Option<AtomicAggregate>,
    pub aggr_asn: Option<Asn>,
    pub aggr_ip: Option<IpAddr>,
}

The main benefit of using BgpElem is that the analysis can be executed on a per-prefix basis, generic to what the backend MRT data format (bgp4mp, tabledumpv1, tabledumpv2, etc.). The obvious drawback is that we will have to duplicate information to save at each elem, that consuming more memory.

ElemIterator

Elementor

RecordIterator