package rawlink

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Portable library to read and write raw packets

Install

Dune Dependency

Authors

Maintainers

Sources

rawlink-1.2.tbz
sha256=a712be95f636466536327fd92ce476fb72a4e06e1b82a85d5b471db8289a91e4
sha512=006a1d57b6e3093c929d0c1d3a53075059d0a35196eebb0b2f444aab3c7492a86befe22de700d40fb479a789470bfe4b1e8b83f02c878cf85b1b5b9d67778aad

Description

Rawlink is an ocaml library for sending and receiving raw packets at the link layer level. Sometimes you need to have full control of the packet, including building the full ethernet frame.

The API is platform independent, it uses BPF on real UNIXes and AF_SOCKET on linux. Some functionality is sacrificed so that the API is portable enough.

Currently BPF and AF_PACKET are implemented, including filtering capabilities. Writing a BPF program is a pain in the ass, so no facilities are provided for it. If you need a BPF filter, I suggest you write a small .c file with a function that returns the BPF program as a string, check rawlink_stubs.c for an example.

Published: 15 Apr 2022

README

Rawlink - portable library to read and write raw packets.

Rawlink is an ocaml library for sending and receiving raw packets at the link layer level. Sometimes you need to have full control of the packet, including building the full ethernet frame.

The API is platform independent, it uses BPF on real UNIXes and AF_SOCKET on linux. Some functionality is sacrificed so that the API is portable enough.

Currently BPF and AF_PACKET are implemented, including filtering capabilities. Writing a BPF program is a pain in the ass, so no facilities are provided for it. If you need a BPF filter, I suggest you write a small .c file with a function that returns the BPF program as a string, check rawlink_stubs.c for an example.

Both normal blocking functions as well as Lwt monadic variants are provided.

A typical code for receiving all packets and just sending them back on an specified interface are detailed below:

let link = Rawlink.open_link "eth0" in
let buf = Rawlink.read_packet link in
Printf.printf "got a packet with %d bytes.\n%!" (Cstruct.len buf);
Rawlink.send_packet link buf

Check the mli interface for more options.

Dependencies (5)

  1. ppx_cstruct
  2. cstruct >= "6.1.0"
  3. lwt >= "2.4.7"
  4. dune
  5. ocaml >= "4.03.0"

Dev Dependencies

None

Used by (2)

  1. charrua-unix >= "0.11.2"
  2. mirage-flow-rawlink >= "1.1.0"

Conflicts

None