43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
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use std::{vec, io};
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use super::{sys, Device};
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/// A virtual Ethernet interface.
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#[derive(Debug)]
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pub struct TapInterface {
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lower: sys::TapInterfaceDesc,
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buffer: vec::Vec<u8>
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}
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impl TapInterface {
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/// Attaches to a TAP interface called `name`, or creates it if it does not exist.
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///
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/// If `name` is a persistent interface configured with UID of the current user,
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/// no special privileges are needed. Otherwise, this requires superuser privileges
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/// or a corresponding capability set on the executable.
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pub fn new(name: &str) -> io::Result<TapInterface> {
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let mut lower = try!(sys::TapInterfaceDesc::new(name));
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try!(lower.attach_interface());
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let mut buffer = vec::Vec::new();
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buffer.resize(Self::MTU, 0);
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Ok(TapInterface {
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lower: lower,
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buffer: buffer
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})
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}
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}
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impl Device for TapInterface {
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const MTU: usize = 1536;
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fn recv<F: FnOnce(&[u8])>(&mut self, handler: F) {
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let len = self.lower.recv(&mut self.buffer[..]).unwrap();
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handler(&self.buffer[..len])
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}
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fn send<F: FnOnce(&mut [u8])>(&mut self, len: usize, handler: F) {
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handler(&mut self.buffer[..len]);
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self.lower.send(&self.buffer[..len]).unwrap();
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}
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}
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