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use crate::error::{Error, Result};
use std::ffi::{c_char, c_int};
use std::io;
use std::net::Ipv4Addr;
/// Helper macro to execute a system call that returns an `io::Result`.
macro_rules! syscall {
($fn: ident ( $($arg: expr),* $(,)* ) ) => {{
#[allow(unused_unsafe)]
let res = unsafe { libc::$fn($($arg, )*) };
if res == -1 {
Err(io::Error::last_os_error())
} else {
Ok(res)
}
}};
}
pub fn format_client_id(client_id: &[u8]) -> Result<String> {
client_id
.iter()
.map(|octet| format!("{:02x}", octet))
.reduce(|acc, octet| acc + ":" + &octet)
.ok_or(Error::EmptyClientId)
}
pub fn local_ip(link: &str) -> Result<Ipv4Addr> {
Ok(linkaddrs::ipv4_addresses(link.to_owned())?
.first()
.ok_or(Error::NoIpv4Addr(link.to_owned()))?
.addr())
}
#[allow(clippy::missing_safety_doc)]
pub unsafe fn setsockopt(
fd: c_int,
opt: c_int,
val: c_int,
payload: *const c_char,
optlen: c_int,
) -> io::Result<()> {
syscall!(setsockopt(
fd,
opt,
val,
payload.cast(),
optlen as libc::socklen_t
))
.map(|_| ())
}
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