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576a28ae5e
We must ensure our MAC addresses do not conflict with a global one. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
89 lines
2.6 KiB
Rust
89 lines
2.6 KiB
Rust
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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//
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// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the THIRD-PARTY file.
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// This is only used by the tests module from tap.rs, but we cannot use #[macro_use] unless the
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// reference to lazy_static is declared at the root level of the importing crate.
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#[cfg(test)]
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#[macro_use]
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extern crate lazy_static;
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extern crate libc;
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extern crate rand;
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extern crate serde;
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extern crate net_gen;
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extern crate vmm_sys_util;
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mod mac;
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mod tap;
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use std::io::Error as IoError;
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use std::mem;
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use std::net;
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use std::os::unix::io::FromRawFd;
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pub use mac::{MacAddr, MAC_ADDR_LEN};
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pub use tap::{Error as TapError, Tap};
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#[derive(Debug)]
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pub enum Error {
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/// Failed to create a socket.
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CreateSocket(IoError),
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}
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pub type Result<T> = std::result::Result<T, Error>;
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/// Create a sockaddr_in from an IPv4 address, and expose it as
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/// an opaque sockaddr suitable for usage by socket ioctls.
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fn create_sockaddr(ip_addr: net::Ipv4Addr) -> net_gen::sockaddr {
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// IPv4 addresses big-endian (network order), but Ipv4Addr will give us
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// a view of those bytes directly so we can avoid any endian trickiness.
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let addr_in = net_gen::sockaddr_in {
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sin_family: net_gen::AF_INET as u16,
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sin_port: 0,
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sin_addr: unsafe { mem::transmute(ip_addr.octets()) },
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__pad: [0; 8usize],
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};
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unsafe { mem::transmute(addr_in) }
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}
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fn create_socket() -> Result<net::UdpSocket> {
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// This is safe since we check the return value.
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let sock = unsafe { libc::socket(libc::AF_INET, libc::SOCK_DGRAM, 0) };
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if sock < 0 {
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return Err(Error::CreateSocket(IoError::last_os_error()));
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}
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// This is safe; nothing else will use or hold onto the raw sock fd.
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Ok(unsafe { net::UdpSocket::from_raw_fd(sock) })
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_create_sockaddr() {
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let addr: net::Ipv4Addr = "10.0.0.1".parse().unwrap();
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let sockaddr = create_sockaddr(addr);
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assert_eq!(sockaddr.sa_family, net_gen::AF_INET as u16);
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let data = &sockaddr.sa_data[..];
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// The first two bytes should represent the port, which is 0.
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assert_eq!(data[0], 0);
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assert_eq!(data[1], 0);
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// The next four bytes should represent the actual IPv4 address, in network order.
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assert_eq!(data[2], 10);
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assert_eq!(data[3], 0);
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assert_eq!(data[4], 0);
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assert_eq!(data[5], 1);
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}
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}
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