Peter Limkilde Svendsen
87 lines
2.4 KiB
Rust
87 lines
2.4 KiB
Rust
//! `net/if.h` implementation.
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//!
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//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/net_if.h.html>.
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use core::ptr::null;
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use alloc::ffi::CString;
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use crate::{
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c_str::CStr,
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platform::{types::*, ERRNO},
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};
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use super::errno::ENXIO;
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/net_if.h.html>.
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#[repr(C)]
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pub struct if_nameindex {
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if_index: c_uint,
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if_name: *const c_char,
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/net_if.h.html>.
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pub const IF_NAMESIZE: usize = 16;
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const IF_STUB_INTERFACE: *const c_char = (c"stub").as_ptr();
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const INTERFACES: &[if_nameindex] = &[
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if_nameindex {
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if_index: 1,
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if_name: IF_STUB_INTERFACE,
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},
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if_nameindex {
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if_index: 0,
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if_name: null::<c_char>(),
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},
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];
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/if_freenameindex.html>.
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///
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/// # Safety
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/// this is a no-op: the list returned by if_nameindex() is a ref to a constant
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#[no_mangle]
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pub unsafe extern "C" fn if_freenameindex(s: *mut if_nameindex) {}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/if_indextoname.html>.
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///
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/// # Safety
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/// Returns only static lifetime references to const names, does not reuse the buf pointer.
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/// Returns NULL in case of not found + ERRNO being set to ENXIO.
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/// Currently only checks against inteface index 1.
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#[no_mangle]
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pub unsafe extern "C" fn if_indextoname(idx: c_uint, buf: *mut c_char) -> *const c_char {
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if idx == 1 {
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return IF_STUB_INTERFACE;
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}
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ERRNO.set(ENXIO);
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null::<c_char>()
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/if_nameindex.html>.
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///
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/// # Safety
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/// Returns a constant pointer to a pre defined const stub list
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/// The end of the list is determined by an if_nameindex struct having if_index 0 and if_name NULL
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#[no_mangle]
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pub unsafe extern "C" fn if_nameindex() -> *const if_nameindex {
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&INTERFACES[0] as *const if_nameindex
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/if_nametoindex.html>.
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///
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/// # Safety
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/// Compares the name to a constant string and only returns an int as a result.
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/// An invalid name string will return an index of 0
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#[no_mangle]
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pub unsafe extern "C" fn if_nametoindex(name: *const c_char) -> c_uint {
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if name == null::<c_char>() {
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return 0;
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}
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let name = CStr::from_ptr(name).to_str().unwrap_or("");
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if name.eq("stub") {
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return 1;
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}
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0
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}
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