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/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree.
*/
use anyhow::bail;
use anyhow::Error;
use clap::Parser;
use libc::in6_addr;
use libc::sigaction;
use libc::sigaddset;
use libc::sigemptyset;
use libc::sigprocmask;
use libc::sigset_t;
use libc::sigwait;
use libc::sockaddr_in6;
use libc::strsignal;
use libc::AF_INET6;
use libc::SA_NODEFER;
use libc::SIGHUP;
use libc::SIGINT;
use libc::SIGPIPE;
use libc::SIGTERM;
use libc::SIGUSR1;
use libc::SIG_BLOCK;
use libc::SIG_IGN;
extern "C" {
fn register_output_module(path: *const c_char, nr_workers: c_int);
fn create_threads(params: &netconsd_params) -> *const c_void;
fn destroy_threads(ctl: *const c_void);
fn destroy_output_modules();
}
#[repr(C)]
#[derive(Copy, Clone)]
pub struct netconsd_params {
pub nr_workers: c_int,
pub nr_listeners: c_int,
pub mmsg_batch: c_int,
pub gc_int_ms: c_uint,
pub gc_age_ms: c_uint,
pub listen_addr: sockaddr_in6,
}
#[derive(Debug)]
struct GcParams {
age: u32,
interval: u32,
}
impl FromStr for GcParams {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let split: Vec<&str> = s.split("/").collect();
if split.len() != 2 {
bail!("Wrong GC format, it should be <age>/<interval>");
}
let age = match split[0].parse::<u32>() {
Ok(x) => x,
Err(_) => bail!("Could not parse age, it should be an unsigned 32bits integer."),
};
let interval = match split[1].parse::<u32>() {
Ok(x) => x,
Err(_) => bail!("Could not parse interval, it should be an unsigned 32bits integer."),
};
if age < interval {
bail!("GC age should >= GC interval");
}
Ok(GcParams { age, interval })
}
}
#[derive(Parser, Debug)]
struct CliArgs {
/// Number of worker threads
#[clap(short, long)]
workers: Option<u16>,
/// Number of listener threads
#[clap(short, long)]
listeners: Option<u16>,
/// Message batch size
#[clap(short, long)]
batch: Option<u16>,
/// UDP listen IPV6 address
#[clap(short, long)]
address: Option<Ipv6Addr>,
/// UDP listen port
#[clap(short = 'u', long)]
port: Option<u16>,
/// Garbage collector interval/age in ms
#[clap(short, long)]
gc: Option<GcParams>,
/// Dynamic modules to load
#[clap()]
modules: Vec<String>,
}
/*
* This exists to kick the blocking recvmmsg() call in the listener threads, so
* they get -EINTR, notice the stop flag, and terminate.
*
* See also: stop_and_wait_for_listeners() in threads.c
*/
fn interrupter_handler(_sig: c_int) {
return;
}
unsafe fn init_sighandlers() {
let ignorer: sigaction = sigaction {
sa_sigaction: SIG_IGN,
sa_mask: MaybeUninit::zeroed().assume_init(),
sa_flags: 0,
sa_restorer: None,
};
let interrupter = sigaction {
sa_sigaction: interrupter_handler as usize,
sa_mask: MaybeUninit::zeroed().assume_init(),
sa_flags: SA_NODEFER,
sa_restorer: None,
};
sigaction(SIGUSR1, &interrupter, std::ptr::null_mut::<sigaction>());
sigaction(SIGPIPE, &ignorer, std::ptr::null_mut::<sigaction>());
}
/*
* Initialize the set of signals for which we try to terminate gracefully.
*/
unsafe fn init_sigset(set: &mut sigset_t) {
sigemptyset(set);
sigaddset(set, SIGTERM);
sigaddset(set, SIGINT);
sigaddset(set, SIGHUP);
}
fn get_netconsd_params(cli_args: &CliArgs) -> netconsd_params {
netconsd_params {
nr_workers: cli_args.workers.unwrap_or(2).into(),
nr_listeners: cli_args.listeners.unwrap_or(1).into(),
mmsg_batch: cli_args.batch.unwrap_or(512).into(),
gc_int_ms: cli_args.gc.as_ref().map(|gc| gc.interval).unwrap_or(0),
gc_age_ms: cli_args.gc.as_ref().map(|gc| gc.age).unwrap_or(0),
listen_addr: sockaddr_in6 {
sin6_family: AF_INET6 as u16,
sin6_port: cli_args.port.unwrap_or(1514).to_be(),
sin6_flowinfo: 0,
sin6_addr: in6_addr {
s6_addr: cli_args
.address
.map(|x| x.octets().clone())
.unwrap_or_else(|| [0u8; 16]),
},
sin6_scope_id: 0,
},
}
}
fn main() {
let cli_args = CliArgs::parse();
let params = get_netconsd_params(&cli_args);
unsafe {
for module in cli_args.modules.iter() {
let path = CString::new(module.as_str()).unwrap();
register_output_module(path.as_ptr(), params.nr_workers);
}
init_sighandlers();
let mut set: sigset_t = MaybeUninit::zeroed().assume_init();
init_sigset(&mut set);
sigprocmask(SIG_BLOCK, &set, std::ptr::null_mut::<sigset_t>());
let mut num: c_int = 0;
let ctl = create_threads(¶ms);
sigwait(&set, &mut num);
println!(
"Signal: '{:?}', terminating",
CStr::from_ptr(strsignal(num))
);
destroy_threads(ctl);
destroy_output_modules();
};
}
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