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Implement IPv4 address configuration on Linux

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This involved refactoring the crate structure to share code between
macOS and Linux. The new methods have not yet been implemented on
macOS, but they have todo!() placeholders.
This commit is contained in:
Conrad Kramer 2023-04-22 14:12:57 -04:00
parent 45499da9c2
commit 1378eb7eb3
15 changed files with 361 additions and 208 deletions
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53
tun/src/apple/kern_control.rs
View file

@ -1,53 +0,0 @@
use libc::{sockaddr_ctl, AF_SYSTEM, AF_SYS_CONTROL};
use std::io::Result;
use std::mem::size_of;
use std::os::unix::io::AsRawFd;
/// Trait to connect to kernel extensions on Apple platforms
///
/// Pulled from XNU source: https://github.com/apple/darwin-xnu/blob/main/bsd/sys/kern_control.h
pub trait SysControlSocket {
fn resolve(&self, name: &str, index: u32) -> Result<socket2::SockAddr>;
}
impl SysControlSocket for socket2::Socket {
fn resolve(&self, name: &str, index: u32) -> Result<socket2::SockAddr> {
let mut info = sys::ctl_info {
ctl_id: 0,
ctl_name: [0; 96],
};
info.ctl_name[..name.len()].copy_from_slice(name.as_bytes());
unsafe { sys::resolve_ctl_info(self.as_raw_fd(), &mut info as *mut sys::ctl_info)? };
let (_, addr) = unsafe {
socket2::SockAddr::init(|addr_storage, len| {
*len = size_of::<sockaddr_ctl>() as u32;
let mut addr: &mut sockaddr_ctl = &mut *addr_storage.cast();
addr.sc_len = *len as u8;
addr.sc_family = AF_SYSTEM as u8;
addr.ss_sysaddr = AF_SYS_CONTROL as u16;
addr.sc_id = info.ctl_id;
addr.sc_unit = index;
Ok(())
})
}?;
Ok(addr)
}
}
mod sys {
use nix::ioctl_readwrite;
const MAX_KCTL_NAME: usize = 96;
#[repr(C)]
pub struct ctl_info {
pub ctl_id: u32,
pub ctl_name: [u8; MAX_KCTL_NAME],
}
ioctl_readwrite!(resolve_ctl_info, b'N', 3, ctl_info);
}