aya/aya-obj/README.md

aya-obj - an eBPF object file loading library

Overview

eBPF programs written with libbpf or aya-bpf are usually compiled into an ELF object file, using various section to store information about the eBPF programs.

aya-obj is a library that loads, parses and processes such eBPF object files.

Example

This example loads a simple eBPF program and runs it with rbpf.

use aya_obj::{generated::bpf_insn, Object};

// Parse the object file
let bytes = std::fs::read("program.o").unwrap();
let mut object = Object::parse(&bytes).unwrap();
// Relocate the programs
object.relocate_calls().unwrap();
object.relocate_maps(std::iter::empty()).unwrap();

// Run with rbpf
let program = object.programs.iter().next().unwrap().1;
let instructions = &program.function.instructions;
let data = unsafe {
    core::slice::from_raw_parts(
        instructions.as_ptr() as *const u8,
        instructions.len() * core::mem::size_of::<bpf_insn>(),
    )
};
let vm = rbpf::EbpfVmNoData::new(Some(data)).unwrap();
let _return = vm.execute_program().unwrap();