Managing ebpf programs without libbpf-cargo

[havefuncoding1]

Hi,

I am working on a Rust-based solution for managing eBPF program in a generic way. Using libbpf-cargo is not an option since the genrated skel.rs files are tailored to specific ebpf programs. In my experiment, I can successfully load the eBPF object file (bpf.o), and bpftool prog list and bpftool map list correctly show the loaded programs and maps. However, eBPF map contents remain empty at runtime.

Does this mean I need to manually attach all tracepoints? If so, do I need to enumerate all SEC() section names in the eBPF object and explicitly call attach_kprobe, attach_tracepoint, etc.? This approach seems cumbersome—I'm wondering if there's a more convenient way to handle this dynamically.

For reference, everything works fine when using libbpf-cargo, so the eBPF implementation itself is correct.

Any insights or suggestions would be greatly appreciated!

Thanks in advance!

use libbpf_rs::ObjectBuilder;

    let path = Path::new("/path/to/myprogram.bpf.o");
    let mut file = File::open(path).expect("Failed to open ebpf object file");
    let mut data = Vec::new();
    file.read_to_end(&mut data).expect("Failed to read ebpf object file");

    let mut obj_builder = ObjectBuilder::default();
    obj_builder.debug(true);
    let open_obj = obj_builder.open_memory(&data).expect("Failed to open ebpf object");
    let obj = open_obj.load().expect("Failed to load ebpf object");