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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate libc;
use std::ffi::OsString;
use std::io;
use std::io::{Read, Result, Write};
use std::mem;
use crate::consts::{CID_BROADCAST, MAX_HID_RPT_SIZE};
use crate::platform::monitor::FidoDev;
use crate::u2ftypes::{U2FDevice, U2FDeviceInfo};
use crate::util::{from_unix_result, io_err};
#[derive(Debug)]
pub struct Device {
path: OsString,
fd: libc::c_int,
cid: [u8; 4],
out_len: usize,
dev_info: Option<U2FDeviceInfo>,
}
impl Device {
pub fn new(fido: FidoDev) -> Result<Self> {
debug!("device found: {:?}", fido);
Ok(Self {
path: fido.os_path,
fd: fido.fd,
cid: CID_BROADCAST,
out_len: 64,
dev_info: None,
})
}
pub fn is_u2f(&mut self) -> bool {
debug!("device {:?} is U2F/FIDO", self.path);
// From OpenBSD's libfido2 in 6.6-current:
// "OpenBSD (as of 201910) has a bug that causes it to lose
// track of the DATA0/DATA1 sequence toggle across uhid device
// open and close. This is a terrible hack to work around it."
match self.ping() {
Ok(_) => true,
Err(err) => {
debug!("device {:?} is not responding: {}", self.path, err);
false
}
}
}
fn ping(&mut self) -> Result<()> {
let capacity = 256;
for _ in 0..10 {
let mut data = vec![0u8; capacity];
// Send 1 byte ping
self.write_all(&[0, 0xff, 0xff, 0xff, 0xff, 0x81, 0, 1])?;
// Wait for response
let mut pfd: libc::pollfd = unsafe { mem::zeroed() };
pfd.fd = self.fd;
pfd.events = libc::POLLIN;
if from_unix_result(unsafe { libc::poll(&mut pfd, 1, 100) })? == 0 {
debug!("device {:?} timeout", self.path);
continue;
}
// Read response
self.read(&mut data[..])?;
return Ok(());
}
Err(io_err("no response from device"))
}
}
impl Drop for Device {
fn drop(&mut self) {
// Close the fd, ignore any errors.
let _ = unsafe { libc::close(self.fd) };
debug!("device {:?} closed", self.path);
}
}
impl PartialEq for Device {
fn eq(&self, other: &Device) -> bool {
self.path == other.path
}
}
impl Read for Device {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
let buf_ptr = buf.as_mut_ptr() as *mut libc::c_void;
let rv = unsafe { libc::read(self.fd, buf_ptr, buf.len()) };
from_unix_result(rv as usize)
}
}
impl Write for Device {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
// Always skip the first byte (report number)
let data = &buf[1..];
let data_ptr = data.as_ptr() as *const libc::c_void;
let rv = unsafe { libc::write(self.fd, data_ptr, data.len()) };
Ok(from_unix_result(rv as usize)? + 1)
}
fn flush(&mut self) -> Result<()> {
Ok(())
}
}
impl U2FDevice for Device {
fn get_cid(&self) -> &[u8; 4] {
&self.cid
}
fn set_cid(&mut self, cid: [u8; 4]) {
self.cid = cid;
}
fn in_rpt_size(&self) -> usize {
MAX_HID_RPT_SIZE
}
fn out_rpt_size(&self) -> usize {
MAX_HID_RPT_SIZE
}
fn get_property(&self, _prop_name: &str) -> io::Result<String> {
Err(io::Error::new(io::ErrorKind::Other, "Not implemented"))
}
fn get_device_info(&self) -> U2FDeviceInfo {
// unwrap is okay, as dev_info must have already been set, else
// a programmer error
self.dev_info.clone().unwrap()
}
fn set_device_info(&mut self, dev_info: U2FDeviceInfo) {
self.dev_info = Some(dev_info);
}
}
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