mirror of https://github.com/dswd/vpncloud.git
47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
use std::fs;
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use std::io::{Read, Write, Result as IoResult, Error as IoError};
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use std::os::unix::io::{AsRawFd, RawFd};
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extern {
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fn setup_tap_device(fd: i32, ifname: *mut u8) -> i32;
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}
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pub struct TapDevice {
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fd: fs::File,
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ifname: String
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}
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impl TapDevice {
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pub fn new(ifname: &str) -> IoResult<TapDevice> {
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let fd = try!(fs::OpenOptions::new().read(true).write(true).open("/dev/net/tun"));
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let mut ifname_string = String::with_capacity(32);
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ifname_string.push_str(ifname);
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ifname_string.push('\0');
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let mut ifname_c = ifname_string.into_bytes();
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match unsafe { setup_tap_device(fd.as_raw_fd(), ifname_c.as_mut_ptr()) } {
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0 => Ok(TapDevice{fd: fd, ifname: String::from_utf8(ifname_c).unwrap()}),
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_ => Err(IoError::last_os_error())
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}
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}
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pub fn ifname(&self) -> &str {
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&self.ifname
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}
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#[inline(always)]
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pub fn read(&mut self, buffer: &mut [u8]) -> IoResult<usize> {
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self.fd.read(buffer)
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}
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#[inline(always)]
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pub fn write(&mut self, buffer: &[u8]) -> IoResult<()> {
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self.fd.write_all(buffer)
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}
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}
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impl AsRawFd for TapDevice {
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fn as_raw_fd(&self) -> RawFd {
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self.fd.as_raw_fd()
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}
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}
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