aya-log is a logging library for eBPF programs written using aya. Think of
it as the log crate for eBPF.
Add aya-log to Cargo.toml:
[dependencies]
aya-log = { git = "https://github.com/aya-rs/aya-log", branch = "main" }Add aya-log-ebpf to Cargo.toml:
[dependencies]
aya-log-ebpf = { git = "https://github.com/aya-rs/aya-log", branch = "main" }Here's an example that uses aya-log in conjunction with the simplelog crate
to log eBPF messages to the terminal.
use simplelog::{ColorChoice, ConfigBuilder, LevelFilter, TermLogger, TerminalMode};
use aya_log::BpfLogger;
TermLogger::init(
LevelFilter::Debug,
ConfigBuilder::new()
.set_target_level(LevelFilter::Error)
.set_location_level(LevelFilter::Error)
.build(),
TerminalMode::Mixed,
ColorChoice::Auto,
)
.unwrap();
// Will log using the default logger, which is TermLogger in this case
BpfLogger::init(&mut bpf).unwrap();use aya_log_ebpf::info;
fn try_xdp_firewall(ctx: XdpContext) -> Result<u32, ()> {
if let Some(port) = tcp_dest_port(&ctx)? {
if block_port(port) {
info!(&ctx, "❌ blocked incoming connection on port: {}", port);
return Ok(XDP_DROP);
}
}
Ok(XDP_PASS)
}