BGPKIT Parser

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

BGPKIT Parser has the following 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

For complete examples, check out the examples folder.

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.

rust 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: rust 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

```rust fn main(){ // set broker query parameters let mut params = bgpkitbroker::QueryParams::new(); params = params.startts(1634693400); params = params.endts(1634693400); params = params.datatype("update"); let mut broker = bgpkitbroker::BgpkitBroker::new("https://api.broker.bgpkit.com/v1"); broker.setparams(&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());
}

} ```

Filtering BGP Messages

BGPKIT Parser also has built-in filtering mechanism. When creating a new BgpkitParser instance, once can also call add_filter function to customize the parser to only show matching messages when iterating through BgpElems.

```norun use bgpkitparser::BgpkitParser;

/// This example shows how to parse a MRT file and filter by prefix. fn main() { envlogger::Builder::fromenv(envlogger::Env::default().defaultfilter_or("info")).init();

log::info!("downloading updates file");

// create a parser that takes the buffered reader
let parser = BgpkitParser::new("http://archive.routeviews.org/bgpdata/2021.10/UPDATES/updates.20211001.0000.bz2").unwrap()
    .add_filter("prefix", "211.98.251.0/24").unwrap();

log::info!("parsing updates file");
// iterating through the parser. the iterator returns `BgpElem` one at a time.
for elem in parser {
    log::info!("{}", &elem);
}
log::info!("done");

} ```

Parsing Real-time Data Streams

BGPKIT Parser also provides parsing functionalities for real-time data streams, including RIS-Live and BMP/OpenBMP messages. See the examples below and the documentation for more.

Parsing Messages From RIS-Live

Here is an example of handling RIS-Live message streams. After connecting to the websocket server, we need to subscribe to a specific data stream. In this example, we subscribe to the data stream from on collector (rrc21). We can then loop and read messages from the websocket.

```rust use bgpkitparser::parserislivemessage; use serde_json::json; use tungstenite::{connect, Message}; use url::Url;

const RISLIVEURL: &str = "ws://ris-live.ripe.net/v1/ws/?client=rust-bgpkit-parser";

/// This is an example of subscribing to RIS-Live's streaming data from one host (rrc21). /// /// For more RIS-Live details, check out their documentation at https://ris-live.ripe.net/manual/ fn main() { // connect to RIPE RIS Live websocket server let (mut socket, response) = connect(Url::parse(RISLIVE_URL).unwrap()) .expect("Can't connect to RIS Live websocket server");

// subscribe to messages from one collector
let msg = json!({"type": "ris_subscribe", "data": {"host": "rrc21"}}).to_string();
socket.write_message(Message::Text(msg)).unwrap();

loop {
    let msg = socket.read_message().expect("Error reading message").to_string();
    if let Ok(elems) = parse_ris_live_message(msg.as_str()) {
        for elem in elems {
            println!("{}", elem);
        }
    }
}

} ```

Parsing OpenBMP Messages From RouteViews Kafka Stream

RouteViews provides a real-time Kafka stream of the OpenBMP data received from their collectors. Below is an partial example of how we handle the raw bytes received from the Kafka stream. For full examples, check out the examples folder on GitHub.

rust let bytes = m.value; let mut reader = Cursor::new(Vec::from(bytes)); let header = parse_openbmp_header(&mut reader).unwrap(); let bmp_msg = parse_bmp_msg(&mut reader); match bmp_msg { Ok(msg) => { let timestamp = header.timestamp; let per_peer_header = msg.per_peer_header.unwrap(); match msg.message_body { MessageBody::RouteMonitoring(m) => { for elem in Elementor::bgp_to_elems( m.bgp_message, timestamp, &per_peer_header.peer_ip, &per_peer_header.peer_asn ) { info!("{}", elem); } } _ => {} } } Err(_e) => { let hex = hex::encode(bytes); error!("{}", hex); break } }

Command Line Tool

bgpkit-parser is bundled with a utility commandline tool bgpkit-parser-cli.

``` bgpkit-parser-cli 0.1.0 bgpkit-parser-cli is a simple cli tool that allow parsing of individual MRT files

USAGE: bgpkit-parser-cli [FLAGS]

FLAGS: -e, --elems-count Count BGP elems -h, --help Prints help information -j, --json Output as JSON objects -p, --pretty Pretty-print JSON output -r, --records-count Count MRT records -V, --version Prints version information

ARGS: File path to a MRT file, local or remote ```

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 strcutrue 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).

```rust 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.

rust 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.

RFCs Support

We support most of the RFCs and plan to continue adding support for more recent RFCs in the future. Here is a list of relevant RFCs that we support or plan to add support.

If you would like to see any specific RFC's support, please submit an issue on GitHub.

BGP

MRT

BMP

Communities

We support normal communities, extended communities, and large communities.

FlowSpec

Minimum Supported Rust Version (MSRV)

1.48.0

Contribution

Issues and pull requests are welcome!

Built with ❤️ by BGPKIT Team

BGPKIT is a small-team start-up that focus on building the best tooling for BGP data in Rust. We have 10 years of experience working with BGP data and believe that our work can enable more companies to start keeping tracks of BGP data on their own turf. Learn more about what services we provide at https://bgpkit.com.

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