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utils.rs
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utils.rs
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use std::{
io,
net::{IpAddr, Ipv4Addr, Ipv6Addr},
sync::atomic::AtomicU32,
};
use futures::StreamExt;
use net_route::{Handle, Route};
pub static DEFAULT_IF_INDEX: AtomicU32 = AtomicU32::new(0);
// #[cfg(not(target_os = "linux"))]
async fn get_default_interface_exclude_self(
handle: &Handle,
this: Option<u32>,
) -> io::Result<Option<Route>> {
for route in handle.list().await? {
if (route.destination == Ipv4Addr::UNSPECIFIED
|| route.destination == std::net::Ipv6Addr::UNSPECIFIED)
&& route.prefix == 0
&& route.gateway != Some(IpAddr::V4(Ipv4Addr::UNSPECIFIED))
&& route.gateway != Some(IpAddr::V6(std::net::Ipv6Addr::UNSPECIFIED))
&& (this.is_none() || route.ifindex != this)
{
return Ok(Some(route));
}
}
Ok(None)
}
// this_if: the interface index of the current tun interface, which should be excluded
pub async fn init_default_interface(handle: Handle, this_if: Option<u32>) -> io::Result<()> {
let default_if = get_default_interface_exclude_self(&handle, this_if).await?;
if let Some(default_if) = default_if {
DEFAULT_IF_INDEX.store(
default_if.ifindex.unwrap_or_default(),
std::sync::atomic::Ordering::SeqCst,
);
Ok(())
} else {
Err(std::io::Error::other("no default interface"))
}
}
pub async fn monitor_default_interface(handle: Handle, this_if: Option<u32>) -> io::Result<()> {
let stream = handle.route_listen_stream();
futures::pin_mut!(stream);
println!("Listening for route events, press Ctrl+C to cancel...");
while let Some(event) = stream.next().await {
println!("event:{:?}", event);
if let Some(route) = get_default_interface_exclude_self(&handle, this_if).await? {
println!("Default route:\n{:?}", route);
DEFAULT_IF_INDEX.store(
route.ifindex.unwrap_or_default(),
std::sync::atomic::Ordering::SeqCst,
);
} else {
println!("No default route found!");
}
}
Ok(())
}
#[cfg(target_os = "linux")]
pub async fn add_ipv6_addr(index: u32, ip: Ipv6Addr, prefix: u8) {
let (connection, handle, _) = rtnetlink::new_connection().unwrap();
tokio::spawn(connection);
handle
.address()
.add(index, IpAddr::V6(ip), prefix)
.execute()
.await
.unwrap()
}
#[cfg(target_os = "macos")]
pub async fn add_ipv6_addr(name: &str, ip: Ipv6Addr, prefix: u8) {
ipv6_addr::add_ipv6_addr(name, ip, prefix).unwrap();
}
#[cfg(target_os = "macos")]
mod ipv6_addr {
use std::{mem, net::Ipv6Addr};
use libc::{c_char, c_int, in6_addr, sockaddr_in6, time_t, AF_INET6, IFNAMSIZ, SOCK_DGRAM};
#[allow(non_camel_case_types)]
#[repr(C)]
#[derive(Copy, Clone)]
pub struct in6_aliasreq {
pub name: [c_char; IFNAMSIZ],
pub addr: sockaddr_in6,
pub dstaddr: sockaddr_in6,
pub prefixmask: sockaddr_in6,
pub flags: c_int,
pub lifetime: in6_addrlifetime,
}
#[allow(non_camel_case_types)]
#[repr(C)]
#[derive(Copy, Clone)]
pub struct in6_addrlifetime {
pub ia6t_expire: time_t,
pub ia6t_preferred: time_t,
pub ia6t_vltime: u32,
pub ia6t_pltime: u32,
}
/// A wrapper for `sockaddr_in6`.
#[derive(Copy, Clone)]
pub struct SockAddrV6(sockaddr_in6);
impl SockAddrV6 {
/// Create a new `SockAddrV6` from a generic `sockaddr`.
pub fn new(value: &sockaddr_in6) -> std::io::Result<Self> {
if value.sin6_family != libc::AF_INET6 as libc::sa_family_t {
return std::io::Result::Err(std::io::Error::new(
std::io::ErrorKind::InvalidInput,
"Invalid address family",
));
}
unsafe { Self::unchecked(value) }
}
/// # Safety
/// Create a new `SockAddrV6` and not check the source.
pub unsafe fn unchecked(value: &sockaddr_in6) -> std::io::Result<Self> {
Ok(SockAddrV6(std::ptr::read(value as *const _ as *const _)))
}
}
impl From<Ipv6Addr> for SockAddrV6 {
fn from(ip: Ipv6Addr) -> SockAddrV6 {
let mut addr = unsafe { mem::zeroed::<sockaddr_in6>() };
let addr_family = if ip.is_unspecified() {
libc::AF_UNSPEC
} else {
libc::AF_INET6
};
// macos: ioctl does not accept sockaddr_in6 without sin6_len set.
addr.sin6_len = mem::size_of::<sockaddr_in6>() as u8;
addr.sin6_family = addr_family as libc::sa_family_t;
addr.sin6_port = 0;
addr.sin6_addr = in6_addr {
s6_addr: ip.octets(),
};
SockAddrV6(addr)
}
}
impl From<SockAddrV6> for Ipv6Addr {
fn from(addr: SockAddrV6) -> Ipv6Addr {
Ipv6Addr::from(addr.0.sin6_addr.s6_addr)
}
}
impl From<SockAddrV6> for sockaddr_in6 {
fn from(addr: SockAddrV6) -> sockaddr_in6 {
addr.0
}
}
ioctl::ioctl!(write siocaifaddr_in6 with 'i', 26; in6_aliasreq);
pub fn add_ipv6_addr(name: &str, addr: Ipv6Addr, prefix_len: u8) -> std::io::Result<()> {
let addr = ipnet::Ipv6Net::new(addr, prefix_len).unwrap();
let mask = addr.netmask();
let addr = addr.addr();
let ctl_inet6 = unsafe { libc::socket(AF_INET6, SOCK_DGRAM, 0) };
unsafe {
let mut req: in6_aliasreq = mem::zeroed();
std::ptr::copy_nonoverlapping(
name.as_ptr() as *const c_char,
req.name.as_mut_ptr(),
name.len(),
);
req.addr = SockAddrV6::from(addr).into();
req.prefixmask = SockAddrV6::from(mask).into();
req.lifetime.ia6t_pltime = u32::MAX;
req.lifetime.ia6t_vltime = u32::MAX;
if siocaifaddr_in6(ctl_inet6, &req) < 0 {
return Err(std::io::Error::last_os_error().into());
}
Ok(())
}
}
}
#[tokio::test]
async fn test_default_if() -> io::Result<()> {
let handle = Handle::new()?;
init_default_interface(handle, None).await?;
let if_name = crate::net::get_default_if_name();
println!("default if name: {:?}", if_name);
let if_index = crate::net::get_if_index(if_name.as_ref().map(|x| x.as_str()).unwrap_or(""));
// let if_index = crate::net::get_if_index("ethernet_32769");
println!("default if index: {:?}", if_index);
Ok(())
}
#[cfg(target_os = "linux")]
#[tokio::test]
async fn test_rules() -> io::Result<()> {
let mut rule1 = net_route::Rule::default();
rule1.suppress_prefixlength = Some(0);
rule1.table_id = Some(254);
rule1.priority = Some(7000);
// will lookup the route table, which has only one route to the tun device
let mut rule2 = net_route::Rule::default();
rule2.table_id = Some(1989);
// rule2.dst = Some((
// "1.0.0.1"
// .parse::<Ipv4Addr>()
// .unwrap()
// .into(),
// 32,
// ));
rule2.priority = Some(7000);
let mut rule3 = net_route::Rule::default();
rule3.suppress_prefixlength = Some(0);
rule3.table_id = Some(254);
rule3.priority = Some(7000);
rule3.v6 = true;
// will lookup the route table, which has only one route to the tun device
let mut rule4 = net_route::Rule::default();
rule4.table_id = Some(1989);
rule4.priority = Some(7000);
// rule4.dst = Some((
// "2603:c024:f:17e:ab4e:5672:fe71:2dd7"
// .parse::<Ipv6Addr>()
// .unwrap()
// .into(),
// 128,
// ));
rule4.v6 = true;
let handle = Handle::new()?;
handle
.delete_rules(vec![rule1, rule2, rule3, rule4])
.await?;
Ok(())
}
#[cfg(target_os = "linux")]
#[tokio::test]
async fn test_list_routes() -> io::Result<()> {
let handle = Handle::new()?;
let routes = handle.list_rules().await?;
for route in routes {
println!("{:?}", route);
}
Ok(())
}
#[tokio::test]
async fn test_clear() -> io::Result<()> {
let handle = Handle::new().unwrap();
let opt = watfaq_tun::Opt {
#[cfg(target_os = "linux")]
table: 1989,
preset: vec![],
if_index: 1,
gateway_ipv4: Some("10.10.2.1".parse().unwrap()),
gateway_ipv6: Some("2:2:1:1443::400".parse().unwrap()),
};
let routes = watfaq_tun::platform::build_routes(&opt);
assert_eq!(routes.len(), 16);
for route in routes {
let _ = handle.delete(&route).await;
}
Ok(())
}